bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 1 | /* |
| 2 | * QEMU System Emulator block driver |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3 | * |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 4 | * Copyright (c) 2003 Fabrice Bellard |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 5 | * Copyright (c) 2020 Virtuozzo International GmbH. |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 6 | * |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 8 | * of this software and associated documentation files (the "Software"), to deal |
| 9 | * in the Software without restriction, including without limitation the rights |
| 10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 11 | * copies of the Software, and to permit persons to whom the Software is |
| 12 | * furnished to do so, subject to the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice shall be included in |
| 15 | * all copies or substantial portions of the Software. |
| 16 | * |
| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 23 | * THE SOFTWARE. |
| 24 | */ |
Markus Armbruster | e688df6 | 2018-02-01 12:18:31 +0100 | [diff] [blame] | 25 | |
Peter Maydell | d38ea87 | 2016-01-29 17:50:05 +0000 | [diff] [blame] | 26 | #include "qemu/osdep.h" |
Daniel P. Berrange | 0ab8ed1 | 2017-01-25 16:14:15 +0000 | [diff] [blame] | 27 | #include "block/trace.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 28 | #include "block/block_int.h" |
| 29 | #include "block/blockjob.h" |
Markus Armbruster | e2c1c34 | 2022-12-21 14:35:49 +0100 | [diff] [blame] | 30 | #include "block/dirty-bitmap.h" |
Max Reitz | 0c9b70d | 2020-10-27 20:05:42 +0100 | [diff] [blame] | 31 | #include "block/fuse.h" |
Kevin Wolf | cd7fca9 | 2016-07-06 11:22:39 +0200 | [diff] [blame] | 32 | #include "block/nbd.h" |
Max Reitz | 609f45e | 2018-06-14 21:14:28 +0200 | [diff] [blame] | 33 | #include "block/qdict.h" |
Markus Armbruster | d49b683 | 2015-03-17 18:29:20 +0100 | [diff] [blame] | 34 | #include "qemu/error-report.h" |
Marc-André Lureau | 5e5733e | 2019-08-29 22:34:43 +0400 | [diff] [blame] | 35 | #include "block/module_block.h" |
Markus Armbruster | db72581 | 2019-08-12 07:23:50 +0200 | [diff] [blame] | 36 | #include "qemu/main-loop.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 37 | #include "qemu/module.h" |
Markus Armbruster | e688df6 | 2018-02-01 12:18:31 +0100 | [diff] [blame] | 38 | #include "qapi/error.h" |
Markus Armbruster | 452fcdb | 2018-02-01 12:18:39 +0100 | [diff] [blame] | 39 | #include "qapi/qmp/qdict.h" |
Paolo Bonzini | 7b1b5d1 | 2012-12-17 18:19:43 +0100 | [diff] [blame] | 40 | #include "qapi/qmp/qjson.h" |
Max Reitz | e59a0cf | 2018-02-24 16:40:32 +0100 | [diff] [blame] | 41 | #include "qapi/qmp/qnull.h" |
Markus Armbruster | fc81fa1 | 2018-02-01 12:18:40 +0100 | [diff] [blame] | 42 | #include "qapi/qmp/qstring.h" |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 43 | #include "qapi/qobject-output-visitor.h" |
| 44 | #include "qapi/qapi-visit-block-core.h" |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 45 | #include "sysemu/block-backend.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 46 | #include "qemu/notify.h" |
Markus Armbruster | 922a01a | 2018-02-01 12:18:46 +0100 | [diff] [blame] | 47 | #include "qemu/option.h" |
Daniel P. Berrange | 10817bf | 2015-09-01 14:48:02 +0100 | [diff] [blame] | 48 | #include "qemu/coroutine.h" |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 49 | #include "block/qapi.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 50 | #include "qemu/timer.h" |
Veronia Bahaa | f348b6d | 2016-03-20 19:16:19 +0200 | [diff] [blame] | 51 | #include "qemu/cutils.h" |
| 52 | #include "qemu/id.h" |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 53 | #include "qemu/range.h" |
| 54 | #include "qemu/rcu.h" |
Vladimir Sementsov-Ogievskiy | 21c2283 | 2020-09-24 21:54:10 +0300 | [diff] [blame] | 55 | #include "block/coroutines.h" |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 56 | |
Juan Quintela | 71e72a1 | 2009-07-27 16:12:56 +0200 | [diff] [blame] | 57 | #ifdef CONFIG_BSD |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 58 | #include <sys/ioctl.h> |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 59 | #include <sys/queue.h> |
Joelle van Dyne | feccdce | 2021-03-15 11:03:39 -0700 | [diff] [blame] | 60 | #if defined(HAVE_SYS_DISK_H) |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 61 | #include <sys/disk.h> |
| 62 | #endif |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 63 | #endif |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 64 | |
aliguori | 49dc768 | 2009-03-08 16:26:59 +0000 | [diff] [blame] | 65 | #ifdef _WIN32 |
| 66 | #include <windows.h> |
| 67 | #endif |
| 68 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 69 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
| 70 | |
Emanuele Giuseppe Esposito | 3b491a9 | 2022-03-03 10:15:48 -0500 | [diff] [blame] | 71 | /* Protected by BQL */ |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 72 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
| 73 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); |
| 74 | |
Emanuele Giuseppe Esposito | 3b491a9 | 2022-03-03 10:15:48 -0500 | [diff] [blame] | 75 | /* Protected by BQL */ |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 76 | static QTAILQ_HEAD(, BlockDriverState) all_bdrv_states = |
| 77 | QTAILQ_HEAD_INITIALIZER(all_bdrv_states); |
| 78 | |
Emanuele Giuseppe Esposito | 3b491a9 | 2022-03-03 10:15:48 -0500 | [diff] [blame] | 79 | /* Protected by BQL */ |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 80 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
| 81 | QLIST_HEAD_INITIALIZER(bdrv_drivers); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 82 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 83 | static BlockDriverState *bdrv_open_inherit(const char *filename, |
| 84 | const char *reference, |
| 85 | QDict *options, int flags, |
| 86 | BlockDriverState *parent, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 87 | const BdrvChildClass *child_class, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 88 | BdrvChildRole child_role, |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 89 | bool parse_filename, |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 90 | Error **errp); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 91 | |
Kevin Wolf | bfb8aa6 | 2021-10-18 15:47:14 +0200 | [diff] [blame] | 92 | static bool bdrv_recurse_has_child(BlockDriverState *bs, |
| 93 | BlockDriverState *child); |
| 94 | |
Kevin Wolf | ad29eb3 | 2023-09-11 11:46:07 +0200 | [diff] [blame] | 95 | static void GRAPH_WRLOCK |
| 96 | bdrv_replace_child_noperm(BdrvChild *child, BlockDriverState *new_bs); |
| 97 | |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 98 | static void GRAPH_WRLOCK |
| 99 | bdrv_remove_child(BdrvChild *child, Transaction *tran); |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 100 | |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 101 | static int bdrv_reopen_prepare(BDRVReopenState *reopen_state, |
| 102 | BlockReopenQueue *queue, |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 103 | Transaction *change_child_tran, Error **errp); |
Vladimir Sementsov-Ogievskiy | 53e96d1 | 2021-04-28 18:17:35 +0300 | [diff] [blame] | 104 | static void bdrv_reopen_commit(BDRVReopenState *reopen_state); |
| 105 | static void bdrv_reopen_abort(BDRVReopenState *reopen_state); |
| 106 | |
Emanuele Giuseppe Esposito | fa8fc1d | 2021-12-15 07:11:38 -0500 | [diff] [blame] | 107 | static bool bdrv_backing_overridden(BlockDriverState *bs); |
| 108 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 109 | static bool bdrv_change_aio_context(BlockDriverState *bs, AioContext *ctx, |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 110 | GHashTable *visited, Transaction *tran, |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 111 | Error **errp); |
| 112 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 113 | /* If non-zero, use only whitelisted block drivers */ |
| 114 | static int use_bdrv_whitelist; |
| 115 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 116 | #ifdef _WIN32 |
| 117 | static int is_windows_drive_prefix(const char *filename) |
| 118 | { |
| 119 | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 120 | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 121 | filename[1] == ':'); |
| 122 | } |
| 123 | |
| 124 | int is_windows_drive(const char *filename) |
| 125 | { |
| 126 | if (is_windows_drive_prefix(filename) && |
| 127 | filename[2] == '\0') |
| 128 | return 1; |
| 129 | if (strstart(filename, "\\\\.\\", NULL) || |
| 130 | strstart(filename, "//./", NULL)) |
| 131 | return 1; |
| 132 | return 0; |
| 133 | } |
| 134 | #endif |
| 135 | |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 136 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
| 137 | { |
| 138 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 139 | /* page size or 4k (hdd sector size) should be on the safe side */ |
Marc-André Lureau | 8e3b0cb | 2022-03-23 19:57:22 +0400 | [diff] [blame] | 140 | return MAX(4096, qemu_real_host_page_size()); |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 141 | } |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 142 | IO_CODE(); |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 143 | |
| 144 | return bs->bl.opt_mem_alignment; |
| 145 | } |
| 146 | |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 147 | size_t bdrv_min_mem_align(BlockDriverState *bs) |
| 148 | { |
| 149 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 150 | /* page size or 4k (hdd sector size) should be on the safe side */ |
Marc-André Lureau | 8e3b0cb | 2022-03-23 19:57:22 +0400 | [diff] [blame] | 151 | return MAX(4096, qemu_real_host_page_size()); |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 152 | } |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 153 | IO_CODE(); |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 154 | |
| 155 | return bs->bl.min_mem_alignment; |
| 156 | } |
| 157 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 158 | /* check if the path starts with "<protocol>:" */ |
Max Reitz | 5c98415 | 2014-12-03 14:57:22 +0100 | [diff] [blame] | 159 | int path_has_protocol(const char *path) |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 160 | { |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 161 | const char *p; |
| 162 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 163 | #ifdef _WIN32 |
| 164 | if (is_windows_drive(path) || |
| 165 | is_windows_drive_prefix(path)) { |
| 166 | return 0; |
| 167 | } |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 168 | p = path + strcspn(path, ":/\\"); |
| 169 | #else |
| 170 | p = path + strcspn(path, ":/"); |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 171 | #endif |
| 172 | |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 173 | return *p == ':'; |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 174 | } |
| 175 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 176 | int path_is_absolute(const char *path) |
| 177 | { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 178 | #ifdef _WIN32 |
| 179 | /* specific case for names like: "\\.\d:" */ |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 180 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 181 | return 1; |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 182 | } |
| 183 | return (*path == '/' || *path == '\\'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 184 | #else |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 185 | return (*path == '/'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 186 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 187 | } |
| 188 | |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 189 | /* if filename is absolute, just return its duplicate. Otherwise, build a |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 190 | path to it by considering it is relative to base_path. URL are |
| 191 | supported. */ |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 192 | char *path_combine(const char *base_path, const char *filename) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 193 | { |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 194 | const char *protocol_stripped = NULL; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 195 | const char *p, *p1; |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 196 | char *result; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 197 | int len; |
| 198 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 199 | if (path_is_absolute(filename)) { |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 200 | return g_strdup(filename); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 201 | } |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 202 | |
| 203 | if (path_has_protocol(base_path)) { |
| 204 | protocol_stripped = strchr(base_path, ':'); |
| 205 | if (protocol_stripped) { |
| 206 | protocol_stripped++; |
| 207 | } |
| 208 | } |
| 209 | p = protocol_stripped ?: base_path; |
| 210 | |
| 211 | p1 = strrchr(base_path, '/'); |
| 212 | #ifdef _WIN32 |
| 213 | { |
| 214 | const char *p2; |
| 215 | p2 = strrchr(base_path, '\\'); |
| 216 | if (!p1 || p2 > p1) { |
| 217 | p1 = p2; |
| 218 | } |
| 219 | } |
| 220 | #endif |
| 221 | if (p1) { |
| 222 | p1++; |
| 223 | } else { |
| 224 | p1 = base_path; |
| 225 | } |
| 226 | if (p1 > p) { |
| 227 | p = p1; |
| 228 | } |
| 229 | len = p - base_path; |
| 230 | |
| 231 | result = g_malloc(len + strlen(filename) + 1); |
| 232 | memcpy(result, base_path, len); |
| 233 | strcpy(result + len, filename); |
| 234 | |
| 235 | return result; |
| 236 | } |
| 237 | |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 238 | /* |
| 239 | * Helper function for bdrv_parse_filename() implementations to remove optional |
| 240 | * protocol prefixes (especially "file:") from a filename and for putting the |
| 241 | * stripped filename into the options QDict if there is such a prefix. |
| 242 | */ |
| 243 | void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix, |
| 244 | QDict *options) |
| 245 | { |
| 246 | if (strstart(filename, prefix, &filename)) { |
| 247 | /* Stripping the explicit protocol prefix may result in a protocol |
| 248 | * prefix being (wrongly) detected (if the filename contains a colon) */ |
| 249 | if (path_has_protocol(filename)) { |
Markus Armbruster | 18cf67c | 2020-12-11 18:11:51 +0100 | [diff] [blame] | 250 | GString *fat_filename; |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 251 | |
| 252 | /* This means there is some colon before the first slash; therefore, |
| 253 | * this cannot be an absolute path */ |
| 254 | assert(!path_is_absolute(filename)); |
| 255 | |
| 256 | /* And we can thus fix the protocol detection issue by prefixing it |
| 257 | * by "./" */ |
Markus Armbruster | 18cf67c | 2020-12-11 18:11:51 +0100 | [diff] [blame] | 258 | fat_filename = g_string_new("./"); |
| 259 | g_string_append(fat_filename, filename); |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 260 | |
Markus Armbruster | 18cf67c | 2020-12-11 18:11:51 +0100 | [diff] [blame] | 261 | assert(!path_has_protocol(fat_filename->str)); |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 262 | |
Markus Armbruster | 18cf67c | 2020-12-11 18:11:51 +0100 | [diff] [blame] | 263 | qdict_put(options, "filename", |
| 264 | qstring_from_gstring(fat_filename)); |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 265 | } else { |
| 266 | /* If no protocol prefix was detected, we can use the shortened |
| 267 | * filename as-is */ |
| 268 | qdict_put_str(options, "filename", filename); |
| 269 | } |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 274 | /* Returns whether the image file is opened as read-only. Note that this can |
| 275 | * return false and writing to the image file is still not possible because the |
| 276 | * image is inactivated. */ |
Jeff Cody | 93ed524 | 2017-04-07 16:55:28 -0400 | [diff] [blame] | 277 | bool bdrv_is_read_only(BlockDriverState *bs) |
| 278 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 279 | IO_CODE(); |
Vladimir Sementsov-Ogievskiy | 975da07 | 2021-05-27 18:40:55 +0300 | [diff] [blame] | 280 | return !(bs->open_flags & BDRV_O_RDWR); |
Jeff Cody | 93ed524 | 2017-04-07 16:55:28 -0400 | [diff] [blame] | 281 | } |
| 282 | |
Kevin Wolf | 4026f1c | 2023-09-29 16:51:47 +0200 | [diff] [blame] | 283 | static int GRAPH_RDLOCK |
| 284 | bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, |
| 285 | bool ignore_allow_rdw, Error **errp) |
Jeff Cody | fe5241b | 2017-04-07 16:55:25 -0400 | [diff] [blame] | 286 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 287 | IO_CODE(); |
| 288 | |
Jeff Cody | e2b8247 | 2017-04-07 16:55:26 -0400 | [diff] [blame] | 289 | /* Do not set read_only if copy_on_read is enabled */ |
| 290 | if (bs->copy_on_read && read_only) { |
| 291 | error_setg(errp, "Can't set node '%s' to r/o with copy-on-read enabled", |
| 292 | bdrv_get_device_or_node_name(bs)); |
| 293 | return -EINVAL; |
| 294 | } |
| 295 | |
Jeff Cody | d6fcdf0 | 2017-04-07 16:55:27 -0400 | [diff] [blame] | 296 | /* Do not clear read_only if it is prohibited */ |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 297 | if (!read_only && !(bs->open_flags & BDRV_O_ALLOW_RDWR) && |
| 298 | !ignore_allow_rdw) |
| 299 | { |
Jeff Cody | d6fcdf0 | 2017-04-07 16:55:27 -0400 | [diff] [blame] | 300 | error_setg(errp, "Node '%s' is read only", |
| 301 | bdrv_get_device_or_node_name(bs)); |
| 302 | return -EPERM; |
| 303 | } |
| 304 | |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 305 | return 0; |
| 306 | } |
| 307 | |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 308 | /* |
| 309 | * Called by a driver that can only provide a read-only image. |
| 310 | * |
| 311 | * Returns 0 if the node is already read-only or it could switch the node to |
| 312 | * read-only because BDRV_O_AUTO_RDONLY is set. |
| 313 | * |
| 314 | * Returns -EACCES if the node is read-write and BDRV_O_AUTO_RDONLY is not set |
| 315 | * or bdrv_can_set_read_only() forbids making the node read-only. If @errmsg |
| 316 | * is not NULL, it is used as the error message for the Error object. |
| 317 | */ |
| 318 | int bdrv_apply_auto_read_only(BlockDriverState *bs, const char *errmsg, |
| 319 | Error **errp) |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 320 | { |
| 321 | int ret = 0; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 322 | IO_CODE(); |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 323 | |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 324 | if (!(bs->open_flags & BDRV_O_RDWR)) { |
| 325 | return 0; |
| 326 | } |
| 327 | if (!(bs->open_flags & BDRV_O_AUTO_RDONLY)) { |
| 328 | goto fail; |
| 329 | } |
| 330 | |
| 331 | ret = bdrv_can_set_read_only(bs, true, false, NULL); |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 332 | if (ret < 0) { |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 333 | goto fail; |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 334 | } |
| 335 | |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 336 | bs->open_flags &= ~BDRV_O_RDWR; |
Kevin Wolf | eeae6a5 | 2018-10-09 16:57:12 +0200 | [diff] [blame] | 337 | |
Jeff Cody | e2b8247 | 2017-04-07 16:55:26 -0400 | [diff] [blame] | 338 | return 0; |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 339 | |
| 340 | fail: |
| 341 | error_setg(errp, "%s", errmsg ?: "Image is read-only"); |
| 342 | return -EACCES; |
Jeff Cody | fe5241b | 2017-04-07 16:55:25 -0400 | [diff] [blame] | 343 | } |
| 344 | |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 345 | /* |
| 346 | * If @backing is empty, this function returns NULL without setting |
| 347 | * @errp. In all other cases, NULL will only be returned with @errp |
| 348 | * set. |
| 349 | * |
| 350 | * Therefore, a return value of NULL without @errp set means that |
| 351 | * there is no backing file; if @errp is set, there is one but its |
| 352 | * absolute filename cannot be generated. |
| 353 | */ |
| 354 | char *bdrv_get_full_backing_filename_from_filename(const char *backed, |
| 355 | const char *backing, |
| 356 | Error **errp) |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 357 | { |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 358 | if (backing[0] == '\0') { |
| 359 | return NULL; |
| 360 | } else if (path_has_protocol(backing) || path_is_absolute(backing)) { |
| 361 | return g_strdup(backing); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 362 | } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) { |
| 363 | error_setg(errp, "Cannot use relative backing file names for '%s'", |
| 364 | backed); |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 365 | return NULL; |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 366 | } else { |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 367 | return path_combine(backed, backing); |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 368 | } |
| 369 | } |
| 370 | |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 371 | /* |
| 372 | * If @filename is empty or NULL, this function returns NULL without |
| 373 | * setting @errp. In all other cases, NULL will only be returned with |
| 374 | * @errp set. |
| 375 | */ |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 376 | static char * GRAPH_RDLOCK |
| 377 | bdrv_make_absolute_filename(BlockDriverState *relative_to, |
| 378 | const char *filename, Error **errp) |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 379 | { |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 380 | char *dir, *full_name; |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 381 | |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 382 | if (!filename || filename[0] == '\0') { |
| 383 | return NULL; |
| 384 | } else if (path_has_protocol(filename) || path_is_absolute(filename)) { |
| 385 | return g_strdup(filename); |
| 386 | } |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 387 | |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 388 | dir = bdrv_dirname(relative_to, errp); |
| 389 | if (!dir) { |
| 390 | return NULL; |
| 391 | } |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 392 | |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 393 | full_name = g_strconcat(dir, filename, NULL); |
| 394 | g_free(dir); |
| 395 | return full_name; |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 396 | } |
| 397 | |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 398 | char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp) |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 399 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 400 | GLOBAL_STATE_CODE(); |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 401 | return bdrv_make_absolute_filename(bs, bs->backing_file, errp); |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 402 | } |
| 403 | |
Stefan Hajnoczi | 0eb7217 | 2015-04-28 14:27:51 +0100 | [diff] [blame] | 404 | void bdrv_register(BlockDriver *bdrv) |
| 405 | { |
Philippe Mathieu-Daudé | a15f08d | 2020-03-18 23:22:35 +0100 | [diff] [blame] | 406 | assert(bdrv->format_name); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 407 | GLOBAL_STATE_CODE(); |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 408 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 409 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 410 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 411 | BlockDriverState *bdrv_new(void) |
| 412 | { |
| 413 | BlockDriverState *bs; |
| 414 | int i; |
| 415 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 416 | GLOBAL_STATE_CODE(); |
| 417 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 418 | bs = g_new0(BlockDriverState, 1); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 419 | QLIST_INIT(&bs->dirty_bitmaps); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 420 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 421 | QLIST_INIT(&bs->op_blockers[i]); |
| 422 | } |
Stefan Hajnoczi | fa9185f | 2023-08-08 11:58:52 -0400 | [diff] [blame] | 423 | qemu_mutex_init(&bs->reqs_lock); |
Paolo Bonzini | 2119882 | 2017-06-05 14:39:03 +0200 | [diff] [blame] | 424 | qemu_mutex_init(&bs->dirty_bitmap_mutex); |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 425 | bs->refcnt = 1; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 426 | bs->aio_context = qemu_get_aio_context(); |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 427 | |
Evgeny Yakovlev | 3ff2f67 | 2016-07-18 22:39:52 +0300 | [diff] [blame] | 428 | qemu_co_queue_init(&bs->flush_queue); |
| 429 | |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 430 | qemu_co_mutex_init(&bs->bsc_modify_lock); |
| 431 | bs->block_status_cache = g_new0(BdrvBlockStatusCache, 1); |
| 432 | |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 433 | for (i = 0; i < bdrv_drain_all_count; i++) { |
| 434 | bdrv_drained_begin(bs); |
| 435 | } |
| 436 | |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 437 | QTAILQ_INSERT_TAIL(&all_bdrv_states, bs, bs_list); |
| 438 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 439 | return bs; |
| 440 | } |
| 441 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 442 | static BlockDriver *bdrv_do_find_format(const char *format_name) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 443 | { |
| 444 | BlockDriver *drv1; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 445 | GLOBAL_STATE_CODE(); |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 446 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 447 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 448 | if (!strcmp(drv1->format_name, format_name)) { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 449 | return drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 450 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 451 | } |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 452 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 453 | return NULL; |
| 454 | } |
| 455 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 456 | BlockDriver *bdrv_find_format(const char *format_name) |
| 457 | { |
| 458 | BlockDriver *drv1; |
| 459 | int i; |
| 460 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 461 | GLOBAL_STATE_CODE(); |
| 462 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 463 | drv1 = bdrv_do_find_format(format_name); |
| 464 | if (drv1) { |
| 465 | return drv1; |
| 466 | } |
| 467 | |
| 468 | /* The driver isn't registered, maybe we need to load a module */ |
| 469 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { |
| 470 | if (!strcmp(block_driver_modules[i].format_name, format_name)) { |
Claudio Fontana | c551fb0 | 2022-09-29 11:30:33 +0200 | [diff] [blame] | 471 | Error *local_err = NULL; |
| 472 | int rv = block_module_load(block_driver_modules[i].library_name, |
| 473 | &local_err); |
| 474 | if (rv > 0) { |
| 475 | return bdrv_do_find_format(format_name); |
| 476 | } else if (rv < 0) { |
| 477 | error_report_err(local_err); |
| 478 | } |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 479 | break; |
| 480 | } |
| 481 | } |
Claudio Fontana | c551fb0 | 2022-09-29 11:30:33 +0200 | [diff] [blame] | 482 | return NULL; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 483 | } |
| 484 | |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 485 | static int bdrv_format_is_whitelisted(const char *format_name, bool read_only) |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 486 | { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 487 | static const char *whitelist_rw[] = { |
| 488 | CONFIG_BDRV_RW_WHITELIST |
Paolo Bonzini | 859aef0 | 2020-08-04 18:14:26 +0200 | [diff] [blame] | 489 | NULL |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 490 | }; |
| 491 | static const char *whitelist_ro[] = { |
| 492 | CONFIG_BDRV_RO_WHITELIST |
Paolo Bonzini | 859aef0 | 2020-08-04 18:14:26 +0200 | [diff] [blame] | 493 | NULL |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 494 | }; |
| 495 | const char **p; |
| 496 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 497 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 498 | return 1; /* no whitelist, anything goes */ |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 499 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 500 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 501 | for (p = whitelist_rw; *p; p++) { |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 502 | if (!strcmp(format_name, *p)) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 503 | return 1; |
| 504 | } |
| 505 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 506 | if (read_only) { |
| 507 | for (p = whitelist_ro; *p; p++) { |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 508 | if (!strcmp(format_name, *p)) { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 509 | return 1; |
| 510 | } |
| 511 | } |
| 512 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 513 | return 0; |
| 514 | } |
| 515 | |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 516 | int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
| 517 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 518 | GLOBAL_STATE_CODE(); |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 519 | return bdrv_format_is_whitelisted(drv->format_name, read_only); |
| 520 | } |
| 521 | |
Daniel P. Berrange | e6ff69b | 2016-03-21 14:11:48 +0000 | [diff] [blame] | 522 | bool bdrv_uses_whitelist(void) |
| 523 | { |
| 524 | return use_bdrv_whitelist; |
| 525 | } |
| 526 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 527 | typedef struct CreateCo { |
| 528 | BlockDriver *drv; |
| 529 | char *filename; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 530 | QemuOpts *opts; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 531 | int ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 532 | Error *err; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 533 | } CreateCo; |
| 534 | |
Emanuele Giuseppe Esposito | 741443e | 2022-11-28 09:23:36 -0500 | [diff] [blame] | 535 | int coroutine_fn bdrv_co_create(BlockDriver *drv, const char *filename, |
| 536 | QemuOpts *opts, Error **errp) |
Emanuele Giuseppe Esposito | 84bdf21 | 2022-11-28 09:23:30 -0500 | [diff] [blame] | 537 | { |
Zhao Liu | 46ff64a | 2024-03-12 14:03:37 +0800 | [diff] [blame] | 538 | ERRP_GUARD(); |
Emanuele Giuseppe Esposito | 84bdf21 | 2022-11-28 09:23:30 -0500 | [diff] [blame] | 539 | int ret; |
| 540 | GLOBAL_STATE_CODE(); |
Emanuele Giuseppe Esposito | 84bdf21 | 2022-11-28 09:23:30 -0500 | [diff] [blame] | 541 | |
| 542 | if (!drv->bdrv_co_create_opts) { |
| 543 | error_setg(errp, "Driver '%s' does not support image creation", |
| 544 | drv->format_name); |
| 545 | return -ENOTSUP; |
| 546 | } |
| 547 | |
| 548 | ret = drv->bdrv_co_create_opts(drv, filename, opts, errp); |
| 549 | if (ret < 0 && !*errp) { |
| 550 | error_setg_errno(errp, -ret, "Could not create image"); |
| 551 | } |
| 552 | |
| 553 | return ret; |
| 554 | } |
| 555 | |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 556 | /** |
| 557 | * Helper function for bdrv_create_file_fallback(): Resize @blk to at |
| 558 | * least the given @minimum_size. |
| 559 | * |
| 560 | * On success, return @blk's actual length. |
| 561 | * Otherwise, return -errno. |
| 562 | */ |
Paolo Bonzini | 84569a7 | 2023-06-01 13:51:38 +0200 | [diff] [blame] | 563 | static int64_t coroutine_fn GRAPH_UNLOCKED |
| 564 | create_file_fallback_truncate(BlockBackend *blk, int64_t minimum_size, |
| 565 | Error **errp) |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 566 | { |
| 567 | Error *local_err = NULL; |
| 568 | int64_t size; |
| 569 | int ret; |
| 570 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 571 | GLOBAL_STATE_CODE(); |
| 572 | |
Paolo Bonzini | 84569a7 | 2023-06-01 13:51:38 +0200 | [diff] [blame] | 573 | ret = blk_co_truncate(blk, minimum_size, false, PREALLOC_MODE_OFF, 0, |
| 574 | &local_err); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 575 | if (ret < 0 && ret != -ENOTSUP) { |
| 576 | error_propagate(errp, local_err); |
| 577 | return ret; |
| 578 | } |
| 579 | |
Paolo Bonzini | 84569a7 | 2023-06-01 13:51:38 +0200 | [diff] [blame] | 580 | size = blk_co_getlength(blk); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 581 | if (size < 0) { |
| 582 | error_free(local_err); |
| 583 | error_setg_errno(errp, -size, |
| 584 | "Failed to inquire the new image file's length"); |
| 585 | return size; |
| 586 | } |
| 587 | |
| 588 | if (size < minimum_size) { |
| 589 | /* Need to grow the image, but we failed to do that */ |
| 590 | error_propagate(errp, local_err); |
| 591 | return -ENOTSUP; |
| 592 | } |
| 593 | |
| 594 | error_free(local_err); |
| 595 | local_err = NULL; |
| 596 | |
| 597 | return size; |
| 598 | } |
| 599 | |
| 600 | /** |
| 601 | * Helper function for bdrv_create_file_fallback(): Zero the first |
| 602 | * sector to remove any potentially pre-existing image header. |
| 603 | */ |
Paolo Bonzini | 881a4c5 | 2022-09-22 10:49:00 +0200 | [diff] [blame] | 604 | static int coroutine_fn |
| 605 | create_file_fallback_zero_first_sector(BlockBackend *blk, |
| 606 | int64_t current_size, |
| 607 | Error **errp) |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 608 | { |
| 609 | int64_t bytes_to_clear; |
| 610 | int ret; |
| 611 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 612 | GLOBAL_STATE_CODE(); |
| 613 | |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 614 | bytes_to_clear = MIN(current_size, BDRV_SECTOR_SIZE); |
| 615 | if (bytes_to_clear) { |
Alberto Faria | ce47ff2 | 2022-10-13 14:37:02 +0200 | [diff] [blame] | 616 | ret = blk_co_pwrite_zeroes(blk, 0, bytes_to_clear, BDRV_REQ_MAY_UNMAP); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 617 | if (ret < 0) { |
| 618 | error_setg_errno(errp, -ret, |
| 619 | "Failed to clear the new image's first sector"); |
| 620 | return ret; |
| 621 | } |
| 622 | } |
| 623 | |
| 624 | return 0; |
| 625 | } |
| 626 | |
Maxim Levitsky | 5a5e7f8 | 2020-03-26 03:12:18 +0200 | [diff] [blame] | 627 | /** |
| 628 | * Simple implementation of bdrv_co_create_opts for protocol drivers |
| 629 | * which only support creation via opening a file |
| 630 | * (usually existing raw storage device) |
| 631 | */ |
| 632 | int coroutine_fn bdrv_co_create_opts_simple(BlockDriver *drv, |
| 633 | const char *filename, |
| 634 | QemuOpts *opts, |
| 635 | Error **errp) |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 636 | { |
Zhao Liu | 7b22e05 | 2024-03-11 11:37:56 +0800 | [diff] [blame] | 637 | ERRP_GUARD(); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 638 | BlockBackend *blk; |
Max Reitz | eeea1fa | 2020-02-25 16:56:18 +0100 | [diff] [blame] | 639 | QDict *options; |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 640 | int64_t size = 0; |
| 641 | char *buf = NULL; |
| 642 | PreallocMode prealloc; |
| 643 | Error *local_err = NULL; |
| 644 | int ret; |
| 645 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 646 | GLOBAL_STATE_CODE(); |
| 647 | |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 648 | size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); |
| 649 | buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); |
| 650 | prealloc = qapi_enum_parse(&PreallocMode_lookup, buf, |
| 651 | PREALLOC_MODE_OFF, &local_err); |
| 652 | g_free(buf); |
| 653 | if (local_err) { |
| 654 | error_propagate(errp, local_err); |
| 655 | return -EINVAL; |
| 656 | } |
| 657 | |
| 658 | if (prealloc != PREALLOC_MODE_OFF) { |
| 659 | error_setg(errp, "Unsupported preallocation mode '%s'", |
| 660 | PreallocMode_str(prealloc)); |
| 661 | return -ENOTSUP; |
| 662 | } |
| 663 | |
Max Reitz | eeea1fa | 2020-02-25 16:56:18 +0100 | [diff] [blame] | 664 | options = qdict_new(); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 665 | qdict_put_str(options, "driver", drv->format_name); |
| 666 | |
Kevin Wolf | be1a732 | 2023-01-26 18:24:31 +0100 | [diff] [blame] | 667 | blk = blk_co_new_open(filename, NULL, options, |
| 668 | BDRV_O_RDWR | BDRV_O_RESIZE, errp); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 669 | if (!blk) { |
Hanna Czenczek | 8162486 | 2023-07-20 16:00:24 +0200 | [diff] [blame] | 670 | error_prepend(errp, "Protocol driver '%s' does not support creating " |
| 671 | "new images, so an existing image must be selected as " |
| 672 | "the target; however, opening the given target as an " |
| 673 | "existing image failed: ", |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 674 | drv->format_name); |
| 675 | return -EINVAL; |
| 676 | } |
| 677 | |
| 678 | size = create_file_fallback_truncate(blk, size, errp); |
| 679 | if (size < 0) { |
| 680 | ret = size; |
| 681 | goto out; |
| 682 | } |
| 683 | |
| 684 | ret = create_file_fallback_zero_first_sector(blk, size, errp); |
| 685 | if (ret < 0) { |
| 686 | goto out; |
| 687 | } |
| 688 | |
| 689 | ret = 0; |
| 690 | out: |
Kevin Wolf | b2ab5f5 | 2023-05-04 13:57:33 +0200 | [diff] [blame] | 691 | blk_co_unref(blk); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 692 | return ret; |
| 693 | } |
| 694 | |
Emanuele Giuseppe Esposito | 2475a0d | 2022-11-28 09:23:31 -0500 | [diff] [blame] | 695 | int coroutine_fn bdrv_co_create_file(const char *filename, QemuOpts *opts, |
| 696 | Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 697 | { |
Stefano Garzarella | 729222a | 2021-03-08 17:12:32 +0100 | [diff] [blame] | 698 | QemuOpts *protocol_opts; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 699 | BlockDriver *drv; |
Stefano Garzarella | 729222a | 2021-03-08 17:12:32 +0100 | [diff] [blame] | 700 | QDict *qdict; |
| 701 | int ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 702 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 703 | GLOBAL_STATE_CODE(); |
| 704 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 705 | drv = bdrv_find_protocol(filename, true, errp); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 706 | if (drv == NULL) { |
Stefan Hajnoczi | 16905d7 | 2010-11-30 15:14:14 +0000 | [diff] [blame] | 707 | return -ENOENT; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 708 | } |
| 709 | |
Stefano Garzarella | 729222a | 2021-03-08 17:12:32 +0100 | [diff] [blame] | 710 | if (!drv->create_opts) { |
| 711 | error_setg(errp, "Driver '%s' does not support image creation", |
| 712 | drv->format_name); |
| 713 | return -ENOTSUP; |
| 714 | } |
| 715 | |
| 716 | /* |
| 717 | * 'opts' contains a QemuOptsList with a combination of format and protocol |
| 718 | * default values. |
| 719 | * |
| 720 | * The format properly removes its options, but the default values remain |
| 721 | * in 'opts->list'. So if the protocol has options with the same name |
| 722 | * (e.g. rbd has 'cluster_size' as qcow2), it will see the default values |
| 723 | * of the format, since for overlapping options, the format wins. |
| 724 | * |
| 725 | * To avoid this issue, lets convert QemuOpts to QDict, in this way we take |
| 726 | * only the set options, and then convert it back to QemuOpts, using the |
| 727 | * create_opts of the protocol. So the new QemuOpts, will contain only the |
| 728 | * protocol defaults. |
| 729 | */ |
| 730 | qdict = qemu_opts_to_qdict(opts, NULL); |
| 731 | protocol_opts = qemu_opts_from_qdict(drv->create_opts, qdict, errp); |
| 732 | if (protocol_opts == NULL) { |
| 733 | ret = -EINVAL; |
| 734 | goto out; |
| 735 | } |
| 736 | |
Emanuele Giuseppe Esposito | 2475a0d | 2022-11-28 09:23:31 -0500 | [diff] [blame] | 737 | ret = bdrv_co_create(drv, filename, protocol_opts, errp); |
Stefano Garzarella | 729222a | 2021-03-08 17:12:32 +0100 | [diff] [blame] | 738 | out: |
| 739 | qemu_opts_del(protocol_opts); |
| 740 | qobject_unref(qdict); |
| 741 | return ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 742 | } |
| 743 | |
Daniel Henrique Barboza | e1d7f8b | 2020-01-30 18:39:05 -0300 | [diff] [blame] | 744 | int coroutine_fn bdrv_co_delete_file(BlockDriverState *bs, Error **errp) |
| 745 | { |
| 746 | Error *local_err = NULL; |
| 747 | int ret; |
| 748 | |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 749 | IO_CODE(); |
Daniel Henrique Barboza | e1d7f8b | 2020-01-30 18:39:05 -0300 | [diff] [blame] | 750 | assert(bs != NULL); |
Kevin Wolf | 48aef79 | 2023-02-03 16:22:00 +0100 | [diff] [blame] | 751 | assert_bdrv_graph_readable(); |
Daniel Henrique Barboza | e1d7f8b | 2020-01-30 18:39:05 -0300 | [diff] [blame] | 752 | |
| 753 | if (!bs->drv) { |
| 754 | error_setg(errp, "Block node '%s' is not opened", bs->filename); |
| 755 | return -ENOMEDIUM; |
| 756 | } |
| 757 | |
| 758 | if (!bs->drv->bdrv_co_delete_file) { |
| 759 | error_setg(errp, "Driver '%s' does not support image deletion", |
| 760 | bs->drv->format_name); |
| 761 | return -ENOTSUP; |
| 762 | } |
| 763 | |
| 764 | ret = bs->drv->bdrv_co_delete_file(bs, &local_err); |
| 765 | if (ret < 0) { |
| 766 | error_propagate(errp, local_err); |
| 767 | } |
| 768 | |
| 769 | return ret; |
| 770 | } |
| 771 | |
Maxim Levitsky | a890f08 | 2020-12-17 19:09:03 +0200 | [diff] [blame] | 772 | void coroutine_fn bdrv_co_delete_file_noerr(BlockDriverState *bs) |
| 773 | { |
| 774 | Error *local_err = NULL; |
| 775 | int ret; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 776 | IO_CODE(); |
Maxim Levitsky | a890f08 | 2020-12-17 19:09:03 +0200 | [diff] [blame] | 777 | |
| 778 | if (!bs) { |
| 779 | return; |
| 780 | } |
| 781 | |
| 782 | ret = bdrv_co_delete_file(bs, &local_err); |
| 783 | /* |
| 784 | * ENOTSUP will happen if the block driver doesn't support |
| 785 | * the 'bdrv_co_delete_file' interface. This is a predictable |
| 786 | * scenario and shouldn't be reported back to the user. |
| 787 | */ |
| 788 | if (ret == -ENOTSUP) { |
| 789 | error_free(local_err); |
| 790 | } else if (ret < 0) { |
| 791 | error_report_err(local_err); |
| 792 | } |
| 793 | } |
| 794 | |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 795 | /** |
| 796 | * Try to get @bs's logical and physical block size. |
| 797 | * On success, store them in @bsz struct and return 0. |
| 798 | * On failure return -errno. |
| 799 | * @bs must not be empty. |
| 800 | */ |
| 801 | int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) |
| 802 | { |
| 803 | BlockDriver *drv = bs->drv; |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 804 | BlockDriverState *filtered = bdrv_filter_bs(bs); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 805 | GLOBAL_STATE_CODE(); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 806 | |
| 807 | if (drv && drv->bdrv_probe_blocksizes) { |
| 808 | return drv->bdrv_probe_blocksizes(bs, bsz); |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 809 | } else if (filtered) { |
| 810 | return bdrv_probe_blocksizes(filtered, bsz); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 811 | } |
| 812 | |
| 813 | return -ENOTSUP; |
| 814 | } |
| 815 | |
| 816 | /** |
| 817 | * Try to get @bs's geometry (cyls, heads, sectors). |
| 818 | * On success, store them in @geo struct and return 0. |
| 819 | * On failure return -errno. |
| 820 | * @bs must not be empty. |
| 821 | */ |
| 822 | int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo) |
| 823 | { |
| 824 | BlockDriver *drv = bs->drv; |
Kevin Wolf | f5a3a27 | 2023-10-27 17:53:12 +0200 | [diff] [blame] | 825 | BlockDriverState *filtered; |
| 826 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 827 | GLOBAL_STATE_CODE(); |
Kevin Wolf | f5a3a27 | 2023-10-27 17:53:12 +0200 | [diff] [blame] | 828 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 829 | |
| 830 | if (drv && drv->bdrv_probe_geometry) { |
| 831 | return drv->bdrv_probe_geometry(bs, geo); |
Kevin Wolf | f5a3a27 | 2023-10-27 17:53:12 +0200 | [diff] [blame] | 832 | } |
| 833 | |
| 834 | filtered = bdrv_filter_bs(bs); |
| 835 | if (filtered) { |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 836 | return bdrv_probe_geometry(filtered, geo); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 837 | } |
| 838 | |
| 839 | return -ENOTSUP; |
| 840 | } |
| 841 | |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 842 | /* |
| 843 | * Create a uniquely-named empty temporary file. |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 844 | * Return the actual file name used upon success, otherwise NULL. |
| 845 | * This string should be freed with g_free() when not needed any longer. |
| 846 | * |
| 847 | * Note: creating a temporary file for the caller to (re)open is |
| 848 | * inherently racy. Use g_file_open_tmp() instead whenever practical. |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 849 | */ |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 850 | char *create_tmp_file(Error **errp) |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 851 | { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 852 | int fd; |
blueswir1 | 7ccfb2e | 2008-09-14 06:45:34 +0000 | [diff] [blame] | 853 | const char *tmpdir; |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 854 | g_autofree char *filename = NULL; |
| 855 | |
| 856 | tmpdir = g_get_tmp_dir(); |
| 857 | #ifndef _WIN32 |
| 858 | /* |
| 859 | * See commit 69bef79 ("block: use /var/tmp instead of /tmp for -snapshot") |
| 860 | * |
| 861 | * This function is used to create temporary disk images (like -snapshot), |
| 862 | * so the files can become very large. /tmp is often a tmpfs where as |
| 863 | * /var/tmp is usually on a disk, so more appropriate for disk images. |
| 864 | */ |
| 865 | if (!g_strcmp0(tmpdir, "/tmp")) { |
Amit Shah | 69bef79 | 2014-02-26 15:12:37 +0530 | [diff] [blame] | 866 | tmpdir = "/var/tmp"; |
| 867 | } |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 868 | #endif |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 869 | |
| 870 | filename = g_strdup_printf("%s/vl.XXXXXX", tmpdir); |
| 871 | fd = g_mkstemp(filename); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 872 | if (fd < 0) { |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 873 | error_setg_errno(errp, errno, "Could not open temporary file '%s'", |
| 874 | filename); |
| 875 | return NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 876 | } |
Bin Meng | 6b6471e | 2022-10-10 12:04:30 +0800 | [diff] [blame] | 877 | close(fd); |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 878 | |
| 879 | return g_steal_pointer(&filename); |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 880 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 881 | |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 882 | /* |
| 883 | * Detect host devices. By convention, /dev/cdrom[N] is always |
| 884 | * recognized as a host CDROM. |
| 885 | */ |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 886 | static BlockDriver *find_hdev_driver(const char *filename) |
| 887 | { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 888 | int score_max = 0, score; |
| 889 | BlockDriver *drv = NULL, *d; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 890 | GLOBAL_STATE_CODE(); |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 891 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 892 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 893 | if (d->bdrv_probe_device) { |
| 894 | score = d->bdrv_probe_device(filename); |
| 895 | if (score > score_max) { |
| 896 | score_max = score; |
| 897 | drv = d; |
| 898 | } |
| 899 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 900 | } |
| 901 | |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 902 | return drv; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 903 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 904 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 905 | static BlockDriver *bdrv_do_find_protocol(const char *protocol) |
| 906 | { |
| 907 | BlockDriver *drv1; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 908 | GLOBAL_STATE_CODE(); |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 909 | |
| 910 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 911 | if (drv1->protocol_name && !strcmp(drv1->protocol_name, protocol)) { |
| 912 | return drv1; |
| 913 | } |
| 914 | } |
| 915 | |
| 916 | return NULL; |
| 917 | } |
| 918 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 919 | BlockDriver *bdrv_find_protocol(const char *filename, |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 920 | bool allow_protocol_prefix, |
| 921 | Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 922 | { |
| 923 | BlockDriver *drv1; |
| 924 | char protocol[128]; |
| 925 | int len; |
| 926 | const char *p; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 927 | int i; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 928 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 929 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 930 | |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 931 | /* |
| 932 | * XXX(hch): we really should not let host device detection |
| 933 | * override an explicit protocol specification, but moving this |
| 934 | * later breaks access to device names with colons in them. |
| 935 | * Thanks to the brain-dead persistent naming schemes on udev- |
| 936 | * based Linux systems those actually are quite common. |
| 937 | */ |
| 938 | drv1 = find_hdev_driver(filename); |
| 939 | if (drv1) { |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 940 | return drv1; |
| 941 | } |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 942 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 943 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 944 | return &bdrv_file; |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 945 | } |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 946 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 947 | p = strchr(filename, ':'); |
| 948 | assert(p != NULL); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 949 | len = p - filename; |
| 950 | if (len > sizeof(protocol) - 1) |
| 951 | len = sizeof(protocol) - 1; |
| 952 | memcpy(protocol, filename, len); |
| 953 | protocol[len] = '\0'; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 954 | |
| 955 | drv1 = bdrv_do_find_protocol(protocol); |
| 956 | if (drv1) { |
| 957 | return drv1; |
| 958 | } |
| 959 | |
| 960 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { |
| 961 | if (block_driver_modules[i].protocol_name && |
| 962 | !strcmp(block_driver_modules[i].protocol_name, protocol)) { |
Claudio Fontana | c551fb0 | 2022-09-29 11:30:33 +0200 | [diff] [blame] | 963 | int rv = block_module_load(block_driver_modules[i].library_name, errp); |
| 964 | if (rv > 0) { |
| 965 | drv1 = bdrv_do_find_protocol(protocol); |
| 966 | } else if (rv < 0) { |
| 967 | return NULL; |
| 968 | } |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 969 | break; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 970 | } |
| 971 | } |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 972 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 973 | if (!drv1) { |
| 974 | error_setg(errp, "Unknown protocol '%s'", protocol); |
| 975 | } |
| 976 | return drv1; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 977 | } |
| 978 | |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 979 | /* |
| 980 | * Guess image format by probing its contents. |
| 981 | * This is not a good idea when your image is raw (CVE-2008-2004), but |
| 982 | * we do it anyway for backward compatibility. |
| 983 | * |
| 984 | * @buf contains the image's first @buf_size bytes. |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 985 | * @buf_size is the buffer size in bytes (generally BLOCK_PROBE_BUF_SIZE, |
| 986 | * but can be smaller if the image file is smaller) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 987 | * @filename is its filename. |
| 988 | * |
| 989 | * For all block drivers, call the bdrv_probe() method to get its |
| 990 | * probing score. |
| 991 | * Return the first block driver with the highest probing score. |
| 992 | */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 993 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, |
| 994 | const char *filename) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 995 | { |
| 996 | int score_max = 0, score; |
| 997 | BlockDriver *drv = NULL, *d; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 998 | IO_CODE(); |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 999 | |
| 1000 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
| 1001 | if (d->bdrv_probe) { |
| 1002 | score = d->bdrv_probe(buf, buf_size, filename); |
| 1003 | if (score > score_max) { |
| 1004 | score_max = score; |
| 1005 | drv = d; |
| 1006 | } |
| 1007 | } |
| 1008 | } |
| 1009 | |
| 1010 | return drv; |
| 1011 | } |
| 1012 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1013 | static int find_image_format(BlockBackend *file, const char *filename, |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1014 | BlockDriver **pdrv, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1015 | { |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 1016 | BlockDriver *drv; |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 1017 | uint8_t buf[BLOCK_PROBE_BUF_SIZE]; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1018 | int ret = 0; |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 1019 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1020 | GLOBAL_STATE_CODE(); |
| 1021 | |
Kevin Wolf | 08a0055 | 2010-06-01 18:37:31 +0200 | [diff] [blame] | 1022 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1023 | if (blk_is_sg(file) || !blk_is_inserted(file) || blk_getlength(file) == 0) { |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 1024 | *pdrv = &bdrv_raw; |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1025 | return ret; |
Nicholas A. Bellinger | 1a39685 | 2010-05-27 08:56:28 -0700 | [diff] [blame] | 1026 | } |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 1027 | |
Alberto Faria | a9262f5 | 2022-07-05 17:15:11 +0100 | [diff] [blame] | 1028 | ret = blk_pread(file, 0, sizeof(buf), buf, 0); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 1029 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1030 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
| 1031 | "format"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1032 | *pdrv = NULL; |
| 1033 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 1034 | } |
| 1035 | |
Alberto Faria | bf5b16f | 2022-07-05 17:15:09 +0100 | [diff] [blame] | 1036 | drv = bdrv_probe_all(buf, sizeof(buf), filename); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1037 | if (!drv) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1038 | error_setg(errp, "Could not determine image format: No compatible " |
| 1039 | "driver found"); |
Alberto Faria | bf5b16f | 2022-07-05 17:15:09 +0100 | [diff] [blame] | 1040 | *pdrv = NULL; |
| 1041 | return -ENOENT; |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1042 | } |
Alberto Faria | bf5b16f | 2022-07-05 17:15:09 +0100 | [diff] [blame] | 1043 | |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1044 | *pdrv = drv; |
Alberto Faria | bf5b16f | 2022-07-05 17:15:09 +0100 | [diff] [blame] | 1045 | return 0; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1046 | } |
| 1047 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1048 | /** |
| 1049 | * Set the current 'total_sectors' value |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 1050 | * Return 0 on success, -errno on error. |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1051 | */ |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 1052 | int coroutine_fn bdrv_co_refresh_total_sectors(BlockDriverState *bs, |
| 1053 | int64_t hint) |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1054 | { |
| 1055 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 1056 | IO_CODE(); |
Kevin Wolf | 8ab8140 | 2023-02-03 16:22:02 +0100 | [diff] [blame] | 1057 | assert_bdrv_graph_readable(); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1058 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 1059 | if (!drv) { |
| 1060 | return -ENOMEDIUM; |
| 1061 | } |
| 1062 | |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 1063 | /* Do not attempt drv->bdrv_co_getlength() on scsi-generic devices */ |
Dimitris Aragiorgis | b192af8 | 2015-06-23 13:44:56 +0300 | [diff] [blame] | 1064 | if (bdrv_is_sg(bs)) |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 1065 | return 0; |
| 1066 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1067 | /* query actual device if possible, otherwise just trust the hint */ |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 1068 | if (drv->bdrv_co_getlength) { |
| 1069 | int64_t length = drv->bdrv_co_getlength(bs); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1070 | if (length < 0) { |
| 1071 | return length; |
| 1072 | } |
Fam Zheng | 7e38200 | 2013-11-06 19:48:06 +0800 | [diff] [blame] | 1073 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1074 | } |
| 1075 | |
| 1076 | bs->total_sectors = hint; |
Vladimir Sementsov-Ogievskiy | 8b11700 | 2020-12-04 01:27:13 +0300 | [diff] [blame] | 1077 | |
| 1078 | if (bs->total_sectors * BDRV_SECTOR_SIZE > BDRV_MAX_LENGTH) { |
| 1079 | return -EFBIG; |
| 1080 | } |
| 1081 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1082 | return 0; |
| 1083 | } |
| 1084 | |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1085 | /** |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 1086 | * Combines a QDict of new block driver @options with any missing options taken |
| 1087 | * from @old_options, so that leaving out an option defaults to its old value. |
| 1088 | */ |
| 1089 | static void bdrv_join_options(BlockDriverState *bs, QDict *options, |
| 1090 | QDict *old_options) |
| 1091 | { |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 1092 | GLOBAL_STATE_CODE(); |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 1093 | if (bs->drv && bs->drv->bdrv_join_options) { |
| 1094 | bs->drv->bdrv_join_options(options, old_options); |
| 1095 | } else { |
| 1096 | qdict_join(options, old_options, false); |
| 1097 | } |
| 1098 | } |
| 1099 | |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 1100 | static BlockdevDetectZeroesOptions bdrv_parse_detect_zeroes(QemuOpts *opts, |
| 1101 | int open_flags, |
| 1102 | Error **errp) |
| 1103 | { |
| 1104 | Error *local_err = NULL; |
| 1105 | char *value = qemu_opt_get_del(opts, "detect-zeroes"); |
| 1106 | BlockdevDetectZeroesOptions detect_zeroes = |
| 1107 | qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, value, |
| 1108 | BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, &local_err); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1109 | GLOBAL_STATE_CODE(); |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 1110 | g_free(value); |
| 1111 | if (local_err) { |
| 1112 | error_propagate(errp, local_err); |
| 1113 | return detect_zeroes; |
| 1114 | } |
| 1115 | |
| 1116 | if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && |
| 1117 | !(open_flags & BDRV_O_UNMAP)) |
| 1118 | { |
| 1119 | error_setg(errp, "setting detect-zeroes to unmap is not allowed " |
| 1120 | "without setting discard operation to unmap"); |
| 1121 | } |
| 1122 | |
| 1123 | return detect_zeroes; |
| 1124 | } |
| 1125 | |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 1126 | /** |
Aarushi Mehta | f80f267 | 2020-01-20 14:18:50 +0000 | [diff] [blame] | 1127 | * Set open flags for aio engine |
| 1128 | * |
| 1129 | * Return 0 on success, -1 if the engine specified is invalid |
| 1130 | */ |
| 1131 | int bdrv_parse_aio(const char *mode, int *flags) |
| 1132 | { |
| 1133 | if (!strcmp(mode, "threads")) { |
| 1134 | /* do nothing, default */ |
| 1135 | } else if (!strcmp(mode, "native")) { |
| 1136 | *flags |= BDRV_O_NATIVE_AIO; |
| 1137 | #ifdef CONFIG_LINUX_IO_URING |
| 1138 | } else if (!strcmp(mode, "io_uring")) { |
| 1139 | *flags |= BDRV_O_IO_URING; |
| 1140 | #endif |
| 1141 | } else { |
| 1142 | return -1; |
| 1143 | } |
| 1144 | |
| 1145 | return 0; |
| 1146 | } |
| 1147 | |
| 1148 | /** |
Paolo Bonzini | 9e8f183 | 2013-02-08 14:06:11 +0100 | [diff] [blame] | 1149 | * Set open flags for a given discard mode |
| 1150 | * |
| 1151 | * Return 0 on success, -1 if the discard mode was invalid. |
| 1152 | */ |
| 1153 | int bdrv_parse_discard_flags(const char *mode, int *flags) |
| 1154 | { |
| 1155 | *flags &= ~BDRV_O_UNMAP; |
| 1156 | |
| 1157 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { |
| 1158 | /* do nothing */ |
| 1159 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { |
| 1160 | *flags |= BDRV_O_UNMAP; |
| 1161 | } else { |
| 1162 | return -1; |
| 1163 | } |
| 1164 | |
| 1165 | return 0; |
| 1166 | } |
| 1167 | |
| 1168 | /** |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1169 | * Set open flags for a given cache mode |
| 1170 | * |
| 1171 | * Return 0 on success, -1 if the cache mode was invalid. |
| 1172 | */ |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1173 | int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough) |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1174 | { |
| 1175 | *flags &= ~BDRV_O_CACHE_MASK; |
| 1176 | |
| 1177 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1178 | *writethrough = false; |
| 1179 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 1180 | } else if (!strcmp(mode, "directsync")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1181 | *writethrough = true; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 1182 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1183 | } else if (!strcmp(mode, "writeback")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1184 | *writethrough = false; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1185 | } else if (!strcmp(mode, "unsafe")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1186 | *writethrough = false; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1187 | *flags |= BDRV_O_NO_FLUSH; |
| 1188 | } else if (!strcmp(mode, "writethrough")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1189 | *writethrough = true; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1190 | } else { |
| 1191 | return -1; |
| 1192 | } |
| 1193 | |
| 1194 | return 0; |
| 1195 | } |
| 1196 | |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 1197 | static char *bdrv_child_get_parent_desc(BdrvChild *c) |
| 1198 | { |
| 1199 | BlockDriverState *parent = c->opaque; |
Vladimir Sementsov-Ogievskiy | 2c0a3ac | 2021-06-01 10:52:15 +0300 | [diff] [blame] | 1200 | return g_strdup_printf("node '%s'", bdrv_get_node_name(parent)); |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 1201 | } |
| 1202 | |
Emanuele Giuseppe Esposito | d05ab38 | 2023-09-29 16:51:40 +0200 | [diff] [blame] | 1203 | static void GRAPH_RDLOCK bdrv_child_cb_drained_begin(BdrvChild *child) |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1204 | { |
| 1205 | BlockDriverState *bs = child->opaque; |
Kevin Wolf | a82a3bd | 2022-11-18 18:41:07 +0100 | [diff] [blame] | 1206 | bdrv_do_drained_begin_quiesce(bs, NULL); |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1207 | } |
| 1208 | |
Emanuele Giuseppe Esposito | d05ab38 | 2023-09-29 16:51:40 +0200 | [diff] [blame] | 1209 | static bool GRAPH_RDLOCK bdrv_child_cb_drained_poll(BdrvChild *child) |
Kevin Wolf | 89bd030 | 2018-03-22 14:11:20 +0100 | [diff] [blame] | 1210 | { |
| 1211 | BlockDriverState *bs = child->opaque; |
Kevin Wolf | 299403a | 2022-11-18 18:41:05 +0100 | [diff] [blame] | 1212 | return bdrv_drain_poll(bs, NULL, false); |
Kevin Wolf | 89bd030 | 2018-03-22 14:11:20 +0100 | [diff] [blame] | 1213 | } |
| 1214 | |
Emanuele Giuseppe Esposito | d05ab38 | 2023-09-29 16:51:40 +0200 | [diff] [blame] | 1215 | static void GRAPH_RDLOCK bdrv_child_cb_drained_end(BdrvChild *child) |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1216 | { |
| 1217 | BlockDriverState *bs = child->opaque; |
Kevin Wolf | 2f65df6 | 2022-11-18 18:40:59 +0100 | [diff] [blame] | 1218 | bdrv_drained_end(bs); |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1219 | } |
| 1220 | |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 1221 | static int bdrv_child_cb_inactivate(BdrvChild *child) |
| 1222 | { |
| 1223 | BlockDriverState *bs = child->opaque; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1224 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 1225 | assert(bs->open_flags & BDRV_O_INACTIVE); |
| 1226 | return 0; |
| 1227 | } |
| 1228 | |
Emanuele Giuseppe Esposito | 27633e7 | 2022-10-25 04:49:47 -0400 | [diff] [blame] | 1229 | static bool bdrv_child_cb_change_aio_ctx(BdrvChild *child, AioContext *ctx, |
| 1230 | GHashTable *visited, Transaction *tran, |
| 1231 | Error **errp) |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 1232 | { |
| 1233 | BlockDriverState *bs = child->opaque; |
Emanuele Giuseppe Esposito | 27633e7 | 2022-10-25 04:49:47 -0400 | [diff] [blame] | 1234 | return bdrv_change_aio_context(bs, ctx, visited, tran, errp); |
Kevin Wolf | 53a7d04 | 2019-05-06 19:17:59 +0200 | [diff] [blame] | 1235 | } |
| 1236 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 1237 | /* |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 1238 | * Returns the options and flags that a temporary snapshot should get, based on |
| 1239 | * the originally requested flags (the originally requested image will have |
| 1240 | * flags like a backing file) |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1241 | */ |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 1242 | static void bdrv_temp_snapshot_options(int *child_flags, QDict *child_options, |
| 1243 | int parent_flags, QDict *parent_options) |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1244 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1245 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 1246 | *child_flags = (parent_flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; |
| 1247 | |
| 1248 | /* For temporary files, unconditional cache=unsafe is fine */ |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 1249 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_DIRECT, "off"); |
| 1250 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on"); |
Kevin Wolf | 4186904 | 2016-06-16 12:59:30 +0200 | [diff] [blame] | 1251 | |
Kevin Wolf | 3f48686 | 2019-04-04 17:04:43 +0200 | [diff] [blame] | 1252 | /* Copy the read-only and discard options from the parent */ |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1253 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); |
Kevin Wolf | 3f48686 | 2019-04-04 17:04:43 +0200 | [diff] [blame] | 1254 | qdict_copy_default(child_options, parent_options, BDRV_OPT_DISCARD); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1255 | |
Kevin Wolf | 4186904 | 2016-06-16 12:59:30 +0200 | [diff] [blame] | 1256 | /* aio=native doesn't work for cache.direct=off, so disable it for the |
| 1257 | * temporary snapshot */ |
| 1258 | *child_flags &= ~BDRV_O_NATIVE_AIO; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1259 | } |
| 1260 | |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 1261 | static void GRAPH_WRLOCK bdrv_backing_attach(BdrvChild *c) |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1262 | { |
| 1263 | BlockDriverState *parent = c->opaque; |
| 1264 | BlockDriverState *backing_hd = c->bs; |
| 1265 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1266 | GLOBAL_STATE_CODE(); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1267 | assert(!parent->backing_blocker); |
| 1268 | error_setg(&parent->backing_blocker, |
| 1269 | "node is used as backing hd of '%s'", |
| 1270 | bdrv_get_device_or_node_name(parent)); |
| 1271 | |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 1272 | bdrv_refresh_filename(backing_hd); |
| 1273 | |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1274 | parent->open_flags &= ~BDRV_O_NO_BACKING; |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1275 | |
| 1276 | bdrv_op_block_all(backing_hd, parent->backing_blocker); |
| 1277 | /* Otherwise we won't be able to commit or stream */ |
| 1278 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, |
| 1279 | parent->backing_blocker); |
| 1280 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_STREAM, |
| 1281 | parent->backing_blocker); |
| 1282 | /* |
| 1283 | * We do backup in 3 ways: |
| 1284 | * 1. drive backup |
| 1285 | * The target bs is new opened, and the source is top BDS |
| 1286 | * 2. blockdev backup |
| 1287 | * Both the source and the target are top BDSes. |
| 1288 | * 3. internal backup(used for block replication) |
| 1289 | * Both the source and the target are backing file |
| 1290 | * |
| 1291 | * In case 1 and 2, neither the source nor the target is the backing file. |
| 1292 | * In case 3, we will block the top BDS, so there is only one block job |
| 1293 | * for the top BDS and its backing chain. |
| 1294 | */ |
| 1295 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_SOURCE, |
| 1296 | parent->backing_blocker); |
| 1297 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_TARGET, |
| 1298 | parent->backing_blocker); |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1299 | } |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 1300 | |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1301 | static void bdrv_backing_detach(BdrvChild *c) |
| 1302 | { |
| 1303 | BlockDriverState *parent = c->opaque; |
| 1304 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1305 | GLOBAL_STATE_CODE(); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1306 | assert(parent->backing_blocker); |
| 1307 | bdrv_op_unblock_all(c->bs, parent->backing_blocker); |
| 1308 | error_free(parent->backing_blocker); |
| 1309 | parent->backing_blocker = NULL; |
Max Reitz | 48e0828 | 2020-05-13 13:05:23 +0200 | [diff] [blame] | 1310 | } |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 1311 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1312 | static int bdrv_backing_update_filename(BdrvChild *c, BlockDriverState *base, |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame] | 1313 | const char *filename, |
| 1314 | bool backing_mask_protocol, |
| 1315 | Error **errp) |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1316 | { |
| 1317 | BlockDriverState *parent = c->opaque; |
Alberto Garcia | e94d3db | 2018-11-12 16:00:34 +0200 | [diff] [blame] | 1318 | bool read_only = bdrv_is_read_only(parent); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1319 | int ret; |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame] | 1320 | const char *format_name; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1321 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1322 | |
Alberto Garcia | e94d3db | 2018-11-12 16:00:34 +0200 | [diff] [blame] | 1323 | if (read_only) { |
| 1324 | ret = bdrv_reopen_set_read_only(parent, false, errp); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 1325 | if (ret < 0) { |
| 1326 | return ret; |
| 1327 | } |
| 1328 | } |
| 1329 | |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame] | 1330 | if (base->drv) { |
| 1331 | /* |
| 1332 | * If the new base image doesn't have a format driver layer, which we |
| 1333 | * detect by the fact that @base is a protocol driver, we record |
| 1334 | * 'raw' as the format instead of putting the protocol name as the |
| 1335 | * backing format |
| 1336 | */ |
| 1337 | if (backing_mask_protocol && base->drv->protocol_name) { |
| 1338 | format_name = "raw"; |
| 1339 | } else { |
| 1340 | format_name = base->drv->format_name; |
| 1341 | } |
| 1342 | } else { |
| 1343 | format_name = ""; |
| 1344 | } |
| 1345 | |
| 1346 | ret = bdrv_change_backing_file(parent, filename, format_name, false); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1347 | if (ret < 0) { |
Kevin Wolf | 6473069 | 2017-11-06 17:52:58 +0100 | [diff] [blame] | 1348 | error_setg_errno(errp, -ret, "Could not update backing file link"); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1349 | } |
| 1350 | |
Alberto Garcia | e94d3db | 2018-11-12 16:00:34 +0200 | [diff] [blame] | 1351 | if (read_only) { |
| 1352 | bdrv_reopen_set_read_only(parent, true, NULL); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 1353 | } |
| 1354 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1355 | return ret; |
| 1356 | } |
| 1357 | |
Max Reitz | fae8bd3 | 2020-05-13 13:05:20 +0200 | [diff] [blame] | 1358 | /* |
| 1359 | * Returns the options and flags that a generic child of a BDS should |
| 1360 | * get, based on the given options and flags for the parent BDS. |
| 1361 | */ |
Max Reitz | 00ff7ff | 2020-05-13 13:05:21 +0200 | [diff] [blame] | 1362 | static void bdrv_inherited_options(BdrvChildRole role, bool parent_is_format, |
| 1363 | int *child_flags, QDict *child_options, |
| 1364 | int parent_flags, QDict *parent_options) |
Max Reitz | fae8bd3 | 2020-05-13 13:05:20 +0200 | [diff] [blame] | 1365 | { |
| 1366 | int flags = parent_flags; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1367 | GLOBAL_STATE_CODE(); |
Max Reitz | fae8bd3 | 2020-05-13 13:05:20 +0200 | [diff] [blame] | 1368 | |
| 1369 | /* |
| 1370 | * First, decide whether to set, clear, or leave BDRV_O_PROTOCOL. |
| 1371 | * Generally, the question to answer is: Should this child be |
| 1372 | * format-probed by default? |
| 1373 | */ |
| 1374 | |
| 1375 | /* |
| 1376 | * Pure and non-filtered data children of non-format nodes should |
| 1377 | * be probed by default (even when the node itself has BDRV_O_PROTOCOL |
| 1378 | * set). This only affects a very limited set of drivers (namely |
| 1379 | * quorum and blkverify when this comment was written). |
| 1380 | * Force-clear BDRV_O_PROTOCOL then. |
| 1381 | */ |
| 1382 | if (!parent_is_format && |
| 1383 | (role & BDRV_CHILD_DATA) && |
| 1384 | !(role & (BDRV_CHILD_METADATA | BDRV_CHILD_FILTERED))) |
| 1385 | { |
| 1386 | flags &= ~BDRV_O_PROTOCOL; |
| 1387 | } |
| 1388 | |
| 1389 | /* |
| 1390 | * All children of format nodes (except for COW children) and all |
| 1391 | * metadata children in general should never be format-probed. |
| 1392 | * Force-set BDRV_O_PROTOCOL then. |
| 1393 | */ |
| 1394 | if ((parent_is_format && !(role & BDRV_CHILD_COW)) || |
| 1395 | (role & BDRV_CHILD_METADATA)) |
| 1396 | { |
| 1397 | flags |= BDRV_O_PROTOCOL; |
| 1398 | } |
| 1399 | |
| 1400 | /* |
| 1401 | * If the cache mode isn't explicitly set, inherit direct and no-flush from |
| 1402 | * the parent. |
| 1403 | */ |
| 1404 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); |
| 1405 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); |
| 1406 | qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE); |
| 1407 | |
| 1408 | if (role & BDRV_CHILD_COW) { |
| 1409 | /* backing files are opened read-only by default */ |
| 1410 | qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "on"); |
| 1411 | qdict_set_default_str(child_options, BDRV_OPT_AUTO_READ_ONLY, "off"); |
| 1412 | } else { |
| 1413 | /* Inherit the read-only option from the parent if it's not set */ |
| 1414 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); |
| 1415 | qdict_copy_default(child_options, parent_options, |
| 1416 | BDRV_OPT_AUTO_READ_ONLY); |
| 1417 | } |
| 1418 | |
| 1419 | /* |
| 1420 | * bdrv_co_pdiscard() respects unmap policy for the parent, so we |
| 1421 | * can default to enable it on lower layers regardless of the |
| 1422 | * parent option. |
| 1423 | */ |
| 1424 | qdict_set_default_str(child_options, BDRV_OPT_DISCARD, "unmap"); |
| 1425 | |
| 1426 | /* Clear flags that only apply to the top layer */ |
| 1427 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); |
| 1428 | |
| 1429 | if (role & BDRV_CHILD_METADATA) { |
| 1430 | flags &= ~BDRV_O_NO_IO; |
| 1431 | } |
| 1432 | if (role & BDRV_CHILD_COW) { |
| 1433 | flags &= ~BDRV_O_TEMPORARY; |
| 1434 | } |
| 1435 | |
| 1436 | *child_flags = flags; |
| 1437 | } |
| 1438 | |
Kevin Wolf | 303de47 | 2022-12-07 14:18:35 +0100 | [diff] [blame] | 1439 | static void GRAPH_WRLOCK bdrv_child_cb_attach(BdrvChild *child) |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1440 | { |
| 1441 | BlockDriverState *bs = child->opaque; |
| 1442 | |
Emanuele Giuseppe Esposito | 3f35f82 | 2022-12-07 14:18:33 +0100 | [diff] [blame] | 1443 | assert_bdrv_graph_writable(); |
Hanna Reitz | a225369 | 2021-11-15 15:53:58 +0100 | [diff] [blame] | 1444 | QLIST_INSERT_HEAD(&bs->children, child, next); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1445 | if (bs->drv->is_filter || (child->role & BDRV_CHILD_FILTERED)) { |
| 1446 | /* |
| 1447 | * Here we handle filters and block/raw-format.c when it behave like |
| 1448 | * filter. They generally have a single PRIMARY child, which is also the |
| 1449 | * FILTERED child, and that they may have multiple more children, which |
| 1450 | * are neither PRIMARY nor FILTERED. And never we have a COW child here. |
| 1451 | * So bs->file will be the PRIMARY child, unless the PRIMARY child goes |
| 1452 | * into bs->backing on exceptional cases; and bs->backing will be |
| 1453 | * nothing else. |
| 1454 | */ |
| 1455 | assert(!(child->role & BDRV_CHILD_COW)); |
| 1456 | if (child->role & BDRV_CHILD_PRIMARY) { |
| 1457 | assert(child->role & BDRV_CHILD_FILTERED); |
| 1458 | assert(!bs->backing); |
| 1459 | assert(!bs->file); |
Hanna Reitz | a225369 | 2021-11-15 15:53:58 +0100 | [diff] [blame] | 1460 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1461 | if (bs->drv->filtered_child_is_backing) { |
| 1462 | bs->backing = child; |
| 1463 | } else { |
| 1464 | bs->file = child; |
| 1465 | } |
| 1466 | } else { |
| 1467 | assert(!(child->role & BDRV_CHILD_FILTERED)); |
| 1468 | } |
| 1469 | } else if (child->role & BDRV_CHILD_COW) { |
| 1470 | assert(bs->drv->supports_backing); |
| 1471 | assert(!(child->role & BDRV_CHILD_PRIMARY)); |
| 1472 | assert(!bs->backing); |
| 1473 | bs->backing = child; |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1474 | bdrv_backing_attach(child); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1475 | } else if (child->role & BDRV_CHILD_PRIMARY) { |
| 1476 | assert(!bs->file); |
| 1477 | bs->file = child; |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1478 | } |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1479 | } |
| 1480 | |
Kevin Wolf | 303de47 | 2022-12-07 14:18:35 +0100 | [diff] [blame] | 1481 | static void GRAPH_WRLOCK bdrv_child_cb_detach(BdrvChild *child) |
Max Reitz | 48e0828 | 2020-05-13 13:05:23 +0200 | [diff] [blame] | 1482 | { |
| 1483 | BlockDriverState *bs = child->opaque; |
| 1484 | |
| 1485 | if (child->role & BDRV_CHILD_COW) { |
| 1486 | bdrv_backing_detach(child); |
| 1487 | } |
| 1488 | |
Emanuele Giuseppe Esposito | 3f35f82 | 2022-12-07 14:18:33 +0100 | [diff] [blame] | 1489 | assert_bdrv_graph_writable(); |
Hanna Reitz | a225369 | 2021-11-15 15:53:58 +0100 | [diff] [blame] | 1490 | QLIST_REMOVE(child, next); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1491 | if (child == bs->backing) { |
| 1492 | assert(child != bs->file); |
| 1493 | bs->backing = NULL; |
| 1494 | } else if (child == bs->file) { |
| 1495 | bs->file = NULL; |
| 1496 | } |
Max Reitz | 48e0828 | 2020-05-13 13:05:23 +0200 | [diff] [blame] | 1497 | } |
| 1498 | |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1499 | static int bdrv_child_cb_update_filename(BdrvChild *c, BlockDriverState *base, |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame] | 1500 | const char *filename, |
| 1501 | bool backing_mask_protocol, |
| 1502 | Error **errp) |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1503 | { |
| 1504 | if (c->role & BDRV_CHILD_COW) { |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame] | 1505 | return bdrv_backing_update_filename(c, base, filename, |
| 1506 | backing_mask_protocol, |
| 1507 | errp); |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1508 | } |
| 1509 | return 0; |
| 1510 | } |
| 1511 | |
Vladimir Sementsov-Ogievskiy | fb62b58 | 2021-05-24 13:12:56 +0300 | [diff] [blame] | 1512 | AioContext *child_of_bds_get_parent_aio_context(BdrvChild *c) |
Vladimir Sementsov-Ogievskiy | 3ca1f32 | 2021-04-28 18:17:33 +0300 | [diff] [blame] | 1513 | { |
| 1514 | BlockDriverState *bs = c->opaque; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 1515 | IO_CODE(); |
Vladimir Sementsov-Ogievskiy | 3ca1f32 | 2021-04-28 18:17:33 +0300 | [diff] [blame] | 1516 | |
| 1517 | return bdrv_get_aio_context(bs); |
| 1518 | } |
| 1519 | |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1520 | const BdrvChildClass child_of_bds = { |
| 1521 | .parent_is_bds = true, |
| 1522 | .get_parent_desc = bdrv_child_get_parent_desc, |
| 1523 | .inherit_options = bdrv_inherited_options, |
| 1524 | .drained_begin = bdrv_child_cb_drained_begin, |
| 1525 | .drained_poll = bdrv_child_cb_drained_poll, |
| 1526 | .drained_end = bdrv_child_cb_drained_end, |
| 1527 | .attach = bdrv_child_cb_attach, |
| 1528 | .detach = bdrv_child_cb_detach, |
| 1529 | .inactivate = bdrv_child_cb_inactivate, |
Emanuele Giuseppe Esposito | 27633e7 | 2022-10-25 04:49:47 -0400 | [diff] [blame] | 1530 | .change_aio_ctx = bdrv_child_cb_change_aio_ctx, |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1531 | .update_filename = bdrv_child_cb_update_filename, |
Vladimir Sementsov-Ogievskiy | fb62b58 | 2021-05-24 13:12:56 +0300 | [diff] [blame] | 1532 | .get_parent_aio_context = child_of_bds_get_parent_aio_context, |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1533 | }; |
| 1534 | |
Vladimir Sementsov-Ogievskiy | 3ca1f32 | 2021-04-28 18:17:33 +0300 | [diff] [blame] | 1535 | AioContext *bdrv_child_get_parent_aio_context(BdrvChild *c) |
| 1536 | { |
Hanna Reitz | d5f8d79 | 2022-11-07 16:13:19 +0100 | [diff] [blame] | 1537 | IO_CODE(); |
Vladimir Sementsov-Ogievskiy | 3ca1f32 | 2021-04-28 18:17:33 +0300 | [diff] [blame] | 1538 | return c->klass->get_parent_aio_context(c); |
| 1539 | } |
| 1540 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1541 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
| 1542 | { |
Kevin Wolf | 61de4c6 | 2016-03-18 17:46:45 +0100 | [diff] [blame] | 1543 | int open_flags = flags; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1544 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1545 | |
| 1546 | /* |
| 1547 | * Clear flags that are internal to the block layer before opening the |
| 1548 | * image. |
| 1549 | */ |
Kevin Wolf | 20cca27 | 2014-06-04 14:33:27 +0200 | [diff] [blame] | 1550 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1551 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1552 | return open_flags; |
| 1553 | } |
| 1554 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1555 | static void update_flags_from_options(int *flags, QemuOpts *opts) |
| 1556 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1557 | GLOBAL_STATE_CODE(); |
| 1558 | |
Alberto Garcia | 2a3d433 | 2018-11-12 16:00:48 +0200 | [diff] [blame] | 1559 | *flags &= ~(BDRV_O_CACHE_MASK | BDRV_O_RDWR | BDRV_O_AUTO_RDONLY); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1560 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 1561 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1562 | *flags |= BDRV_O_NO_FLUSH; |
| 1563 | } |
| 1564 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 1565 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_CACHE_DIRECT, false)) { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1566 | *flags |= BDRV_O_NOCACHE; |
| 1567 | } |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1568 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 1569 | if (!qemu_opt_get_bool_del(opts, BDRV_OPT_READ_ONLY, false)) { |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1570 | *flags |= BDRV_O_RDWR; |
| 1571 | } |
| 1572 | |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1573 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_AUTO_READ_ONLY, false)) { |
| 1574 | *flags |= BDRV_O_AUTO_RDONLY; |
| 1575 | } |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1576 | } |
| 1577 | |
| 1578 | static void update_options_from_flags(QDict *options, int flags) |
| 1579 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1580 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1581 | if (!qdict_haskey(options, BDRV_OPT_CACHE_DIRECT)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1582 | qdict_put_bool(options, BDRV_OPT_CACHE_DIRECT, flags & BDRV_O_NOCACHE); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1583 | } |
| 1584 | if (!qdict_haskey(options, BDRV_OPT_CACHE_NO_FLUSH)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1585 | qdict_put_bool(options, BDRV_OPT_CACHE_NO_FLUSH, |
| 1586 | flags & BDRV_O_NO_FLUSH); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1587 | } |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1588 | if (!qdict_haskey(options, BDRV_OPT_READ_ONLY)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1589 | qdict_put_bool(options, BDRV_OPT_READ_ONLY, !(flags & BDRV_O_RDWR)); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1590 | } |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1591 | if (!qdict_haskey(options, BDRV_OPT_AUTO_READ_ONLY)) { |
| 1592 | qdict_put_bool(options, BDRV_OPT_AUTO_READ_ONLY, |
| 1593 | flags & BDRV_O_AUTO_RDONLY); |
| 1594 | } |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1595 | } |
| 1596 | |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 1597 | static void bdrv_assign_node_name(BlockDriverState *bs, |
| 1598 | const char *node_name, |
| 1599 | Error **errp) |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1600 | { |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1601 | char *gen_node_name = NULL; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1602 | GLOBAL_STATE_CODE(); |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1603 | |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1604 | if (!node_name) { |
| 1605 | node_name = gen_node_name = id_generate(ID_BLOCK); |
| 1606 | } else if (!id_wellformed(node_name)) { |
| 1607 | /* |
| 1608 | * Check for empty string or invalid characters, but not if it is |
| 1609 | * generated (generated names use characters not available to the user) |
| 1610 | */ |
Connor Kuehl | 785ec4b | 2021-03-05 09:19:28 -0600 | [diff] [blame] | 1611 | error_setg(errp, "Invalid node-name: '%s'", node_name); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 1612 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1613 | } |
| 1614 | |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1615 | /* takes care of avoiding namespaces collisions */ |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 1616 | if (blk_by_name(node_name)) { |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1617 | error_setg(errp, "node-name=%s is conflicting with a device id", |
| 1618 | node_name); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1619 | goto out; |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1620 | } |
| 1621 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1622 | /* takes care of avoiding duplicates node names */ |
| 1623 | if (bdrv_find_node(node_name)) { |
Connor Kuehl | 785ec4b | 2021-03-05 09:19:28 -0600 | [diff] [blame] | 1624 | error_setg(errp, "Duplicate nodes with node-name='%s'", node_name); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1625 | goto out; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1626 | } |
| 1627 | |
Kevin Wolf | 824808d | 2018-07-04 13:28:29 +0200 | [diff] [blame] | 1628 | /* Make sure that the node name isn't truncated */ |
| 1629 | if (strlen(node_name) >= sizeof(bs->node_name)) { |
| 1630 | error_setg(errp, "Node name too long"); |
| 1631 | goto out; |
| 1632 | } |
| 1633 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1634 | /* copy node name into the bs and insert it into the graph list */ |
| 1635 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); |
| 1636 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1637 | out: |
| 1638 | g_free(gen_node_name); |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1639 | } |
| 1640 | |
Kevin Wolf | 1a30b0f | 2023-05-04 13:57:38 +0200 | [diff] [blame] | 1641 | static int no_coroutine_fn GRAPH_UNLOCKED |
| 1642 | bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, const char *node_name, |
| 1643 | QDict *options, int open_flags, Error **errp) |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1644 | { |
| 1645 | Error *local_err = NULL; |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 1646 | int i, ret; |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 1647 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1648 | |
| 1649 | bdrv_assign_node_name(bs, node_name, &local_err); |
| 1650 | if (local_err) { |
| 1651 | error_propagate(errp, local_err); |
| 1652 | return -EINVAL; |
| 1653 | } |
| 1654 | |
| 1655 | bs->drv = drv; |
| 1656 | bs->opaque = g_malloc0(drv->instance_size); |
| 1657 | |
Paolo Bonzini | ae8b45d | 2022-11-24 16:29:06 +0100 | [diff] [blame] | 1658 | assert(!drv->bdrv_needs_filename || bs->filename[0]); |
Paolo Bonzini | 44b424d | 2022-11-24 16:22:22 +0100 | [diff] [blame] | 1659 | if (drv->bdrv_open) { |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1660 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1661 | } else { |
| 1662 | ret = 0; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1663 | } |
| 1664 | |
| 1665 | if (ret < 0) { |
| 1666 | if (local_err) { |
| 1667 | error_propagate(errp, local_err); |
| 1668 | } else if (bs->filename[0]) { |
| 1669 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); |
| 1670 | } else { |
| 1671 | error_setg_errno(errp, -ret, "Could not open image"); |
| 1672 | } |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1673 | goto open_failed; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1674 | } |
| 1675 | |
Stefan Hajnoczi | e8b6535 | 2022-10-13 14:59:01 -0400 | [diff] [blame] | 1676 | assert(!(bs->supported_read_flags & ~BDRV_REQ_MASK)); |
| 1677 | assert(!(bs->supported_write_flags & ~BDRV_REQ_MASK)); |
| 1678 | |
| 1679 | /* |
| 1680 | * Always allow the BDRV_REQ_REGISTERED_BUF optimization hint. This saves |
| 1681 | * drivers that pass read/write requests through to a child the trouble of |
| 1682 | * declaring support explicitly. |
| 1683 | * |
| 1684 | * Drivers must not propagate this flag accidentally when they initiate I/O |
| 1685 | * to a bounce buffer. That case should be rare though. |
| 1686 | */ |
| 1687 | bs->supported_read_flags |= BDRV_REQ_REGISTERED_BUF; |
| 1688 | bs->supported_write_flags |= BDRV_REQ_REGISTERED_BUF; |
| 1689 | |
Emanuele Giuseppe Esposito | c057960 | 2023-01-13 21:42:03 +0100 | [diff] [blame] | 1690 | ret = bdrv_refresh_total_sectors(bs, bs->total_sectors); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1691 | if (ret < 0) { |
| 1692 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1693 | return ret; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1694 | } |
| 1695 | |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 1696 | bdrv_graph_rdlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 1e4c797 | 2021-04-28 18:17:55 +0300 | [diff] [blame] | 1697 | bdrv_refresh_limits(bs, NULL, &local_err); |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 1698 | bdrv_graph_rdunlock_main_loop(); |
| 1699 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1700 | if (local_err) { |
| 1701 | error_propagate(errp, local_err); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1702 | return -EINVAL; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1703 | } |
| 1704 | |
| 1705 | assert(bdrv_opt_mem_align(bs) != 0); |
| 1706 | assert(bdrv_min_mem_align(bs) != 0); |
| 1707 | assert(is_power_of_2(bs->bl.request_alignment)); |
| 1708 | |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 1709 | for (i = 0; i < bs->quiesce_counter; i++) { |
Kevin Wolf | 5e8ac21 | 2022-11-18 18:40:58 +0100 | [diff] [blame] | 1710 | if (drv->bdrv_drain_begin) { |
| 1711 | drv->bdrv_drain_begin(bs); |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 1712 | } |
| 1713 | } |
| 1714 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1715 | return 0; |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1716 | open_failed: |
| 1717 | bs->drv = NULL; |
Kevin Wolf | 1f051dc | 2023-10-27 17:53:33 +0200 | [diff] [blame] | 1718 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 1719 | bdrv_graph_wrlock(); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1720 | if (bs->file != NULL) { |
| 1721 | bdrv_unref_child(bs, bs->file); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1722 | assert(!bs->file); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1723 | } |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 1724 | bdrv_graph_wrunlock(); |
Kevin Wolf | 1f051dc | 2023-10-27 17:53:33 +0200 | [diff] [blame] | 1725 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1726 | g_free(bs->opaque); |
| 1727 | bs->opaque = NULL; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1728 | return ret; |
| 1729 | } |
| 1730 | |
Vladimir Sementsov-Ogievskiy | 621d173 | 2021-09-20 14:55:34 +0300 | [diff] [blame] | 1731 | /* |
| 1732 | * Create and open a block node. |
| 1733 | * |
| 1734 | * @options is a QDict of options to pass to the block drivers, or NULL for an |
| 1735 | * empty set of options. The reference to the QDict belongs to the block layer |
| 1736 | * after the call (even on failure), so if the caller intends to reuse the |
| 1737 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. |
| 1738 | */ |
| 1739 | BlockDriverState *bdrv_new_open_driver_opts(BlockDriver *drv, |
| 1740 | const char *node_name, |
| 1741 | QDict *options, int flags, |
| 1742 | Error **errp) |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1743 | { |
| 1744 | BlockDriverState *bs; |
| 1745 | int ret; |
| 1746 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 1747 | GLOBAL_STATE_CODE(); |
| 1748 | |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1749 | bs = bdrv_new(); |
| 1750 | bs->open_flags = flags; |
Vladimir Sementsov-Ogievskiy | 621d173 | 2021-09-20 14:55:34 +0300 | [diff] [blame] | 1751 | bs->options = options ?: qdict_new(); |
| 1752 | bs->explicit_options = qdict_clone_shallow(bs->options); |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1753 | bs->opaque = NULL; |
| 1754 | |
| 1755 | update_options_from_flags(bs->options, flags); |
| 1756 | |
| 1757 | ret = bdrv_open_driver(bs, drv, node_name, bs->options, flags, errp); |
| 1758 | if (ret < 0) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1759 | qobject_unref(bs->explicit_options); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1760 | bs->explicit_options = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1761 | qobject_unref(bs->options); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1762 | bs->options = NULL; |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1763 | bdrv_unref(bs); |
| 1764 | return NULL; |
| 1765 | } |
| 1766 | |
| 1767 | return bs; |
| 1768 | } |
| 1769 | |
Vladimir Sementsov-Ogievskiy | 621d173 | 2021-09-20 14:55:34 +0300 | [diff] [blame] | 1770 | /* Create and open a block node. */ |
| 1771 | BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, |
| 1772 | int flags, Error **errp) |
| 1773 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 1774 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 621d173 | 2021-09-20 14:55:34 +0300 | [diff] [blame] | 1775 | return bdrv_new_open_driver_opts(drv, node_name, NULL, flags, errp); |
| 1776 | } |
| 1777 | |
Kevin Wolf | c5f3014 | 2016-10-06 11:33:17 +0200 | [diff] [blame] | 1778 | QemuOptsList bdrv_runtime_opts = { |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1779 | .name = "bdrv_common", |
| 1780 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_runtime_opts.head), |
| 1781 | .desc = { |
| 1782 | { |
| 1783 | .name = "node-name", |
| 1784 | .type = QEMU_OPT_STRING, |
| 1785 | .help = "Node name of the block device node", |
| 1786 | }, |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1787 | { |
| 1788 | .name = "driver", |
| 1789 | .type = QEMU_OPT_STRING, |
| 1790 | .help = "Block driver to use for the node", |
| 1791 | }, |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1792 | { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1793 | .name = BDRV_OPT_CACHE_DIRECT, |
| 1794 | .type = QEMU_OPT_BOOL, |
| 1795 | .help = "Bypass software writeback cache on the host", |
| 1796 | }, |
| 1797 | { |
| 1798 | .name = BDRV_OPT_CACHE_NO_FLUSH, |
| 1799 | .type = QEMU_OPT_BOOL, |
| 1800 | .help = "Ignore flush requests", |
| 1801 | }, |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1802 | { |
| 1803 | .name = BDRV_OPT_READ_ONLY, |
| 1804 | .type = QEMU_OPT_BOOL, |
| 1805 | .help = "Node is opened in read-only mode", |
| 1806 | }, |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1807 | { |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1808 | .name = BDRV_OPT_AUTO_READ_ONLY, |
| 1809 | .type = QEMU_OPT_BOOL, |
| 1810 | .help = "Node can become read-only if opening read-write fails", |
| 1811 | }, |
| 1812 | { |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1813 | .name = "detect-zeroes", |
| 1814 | .type = QEMU_OPT_STRING, |
| 1815 | .help = "try to optimize zero writes (off, on, unmap)", |
| 1816 | }, |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1817 | { |
Alberto Garcia | 415bbca | 2018-10-03 13:23:13 +0300 | [diff] [blame] | 1818 | .name = BDRV_OPT_DISCARD, |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1819 | .type = QEMU_OPT_STRING, |
| 1820 | .help = "discard operation (ignore/off, unmap/on)", |
| 1821 | }, |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 1822 | { |
| 1823 | .name = BDRV_OPT_FORCE_SHARE, |
| 1824 | .type = QEMU_OPT_BOOL, |
| 1825 | .help = "always accept other writers (default: off)", |
| 1826 | }, |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1827 | { /* end of list */ } |
| 1828 | }, |
| 1829 | }; |
| 1830 | |
Maxim Levitsky | 5a5e7f8 | 2020-03-26 03:12:18 +0200 | [diff] [blame] | 1831 | QemuOptsList bdrv_create_opts_simple = { |
| 1832 | .name = "simple-create-opts", |
| 1833 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_create_opts_simple.head), |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 1834 | .desc = { |
| 1835 | { |
| 1836 | .name = BLOCK_OPT_SIZE, |
| 1837 | .type = QEMU_OPT_SIZE, |
| 1838 | .help = "Virtual disk size" |
| 1839 | }, |
| 1840 | { |
| 1841 | .name = BLOCK_OPT_PREALLOC, |
| 1842 | .type = QEMU_OPT_STRING, |
| 1843 | .help = "Preallocation mode (allowed values: off)" |
| 1844 | }, |
| 1845 | { /* end of list */ } |
| 1846 | } |
| 1847 | }; |
| 1848 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1849 | /* |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1850 | * Common part for opening disk images and files |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1851 | * |
| 1852 | * Removes all processed options from *options. |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1853 | */ |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1854 | static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file, |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1855 | QDict *options, Error **errp) |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1856 | { |
| 1857 | int ret, open_flags; |
Kevin Wolf | 035fccd | 2013-04-09 14:34:19 +0200 | [diff] [blame] | 1858 | const char *filename; |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1859 | const char *driver_name = NULL; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1860 | const char *node_name = NULL; |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1861 | const char *discard; |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1862 | QemuOpts *opts; |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1863 | BlockDriver *drv; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1864 | Error *local_err = NULL; |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1865 | bool ro; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1866 | |
Kevin Wolf | 1f051dc | 2023-10-27 17:53:33 +0200 | [diff] [blame] | 1867 | GLOBAL_STATE_CODE(); |
| 1868 | |
| 1869 | bdrv_graph_rdlock_main_loop(); |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 1870 | assert(bs->file == NULL); |
Kevin Wolf | 707ff82 | 2013-03-06 12:20:31 +0100 | [diff] [blame] | 1871 | assert(options != NULL && bs->options != options); |
Kevin Wolf | 1f051dc | 2023-10-27 17:53:33 +0200 | [diff] [blame] | 1872 | bdrv_graph_rdunlock_main_loop(); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1873 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1874 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
Markus Armbruster | af175e8 | 2020-07-07 18:06:03 +0200 | [diff] [blame] | 1875 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1876 | ret = -EINVAL; |
| 1877 | goto fail_opts; |
| 1878 | } |
| 1879 | |
Alberto Garcia | 9b7e869 | 2016-09-15 17:53:01 +0300 | [diff] [blame] | 1880 | update_flags_from_options(&bs->open_flags, opts); |
| 1881 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1882 | driver_name = qemu_opt_get(opts, "driver"); |
| 1883 | drv = bdrv_find_format(driver_name); |
| 1884 | assert(drv != NULL); |
| 1885 | |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 1886 | bs->force_share = qemu_opt_get_bool(opts, BDRV_OPT_FORCE_SHARE, false); |
| 1887 | |
| 1888 | if (bs->force_share && (bs->open_flags & BDRV_O_RDWR)) { |
| 1889 | error_setg(errp, |
| 1890 | BDRV_OPT_FORCE_SHARE |
| 1891 | "=on can only be used with read-only images"); |
| 1892 | ret = -EINVAL; |
| 1893 | goto fail_opts; |
| 1894 | } |
| 1895 | |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1896 | if (file != NULL) { |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 1897 | bdrv_graph_rdlock_main_loop(); |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 1898 | bdrv_refresh_filename(blk_bs(file)); |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 1899 | bdrv_graph_rdunlock_main_loop(); |
| 1900 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1901 | filename = blk_bs(file)->filename; |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1902 | } else { |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 1903 | /* |
| 1904 | * Caution: while qdict_get_try_str() is fine, getting |
| 1905 | * non-string types would require more care. When @options |
| 1906 | * come from -blockdev or blockdev_add, its members are typed |
| 1907 | * according to the QAPI schema, but when they come from |
| 1908 | * -drive, they're all QString. |
| 1909 | */ |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1910 | filename = qdict_get_try_str(options, "filename"); |
| 1911 | } |
| 1912 | |
Max Reitz | 4a00824 | 2017-04-13 18:06:24 +0200 | [diff] [blame] | 1913 | if (drv->bdrv_needs_filename && (!filename || !filename[0])) { |
Kevin Wolf | 765003d | 2014-02-03 14:49:42 +0100 | [diff] [blame] | 1914 | error_setg(errp, "The '%s' block driver requires a file name", |
| 1915 | drv->format_name); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1916 | ret = -EINVAL; |
| 1917 | goto fail_opts; |
| 1918 | } |
| 1919 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1920 | trace_bdrv_open_common(bs, filename ?: "", bs->open_flags, |
| 1921 | drv->format_name); |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1922 | |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1923 | ro = bdrv_is_read_only(bs); |
| 1924 | |
| 1925 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, ro)) { |
| 1926 | if (!ro && bdrv_is_whitelisted(drv, true)) { |
Kevin Wolf | 018f9de | 2023-09-29 16:51:53 +0200 | [diff] [blame] | 1927 | bdrv_graph_rdlock_main_loop(); |
Kevin Wolf | 8be25de | 2019-01-22 13:15:31 +0100 | [diff] [blame] | 1928 | ret = bdrv_apply_auto_read_only(bs, NULL, NULL); |
Kevin Wolf | 018f9de | 2023-09-29 16:51:53 +0200 | [diff] [blame] | 1929 | bdrv_graph_rdunlock_main_loop(); |
Kevin Wolf | 8be25de | 2019-01-22 13:15:31 +0100 | [diff] [blame] | 1930 | } else { |
| 1931 | ret = -ENOTSUP; |
| 1932 | } |
| 1933 | if (ret < 0) { |
| 1934 | error_setg(errp, |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1935 | !ro && bdrv_is_whitelisted(drv, true) |
Kevin Wolf | 8be25de | 2019-01-22 13:15:31 +0100 | [diff] [blame] | 1936 | ? "Driver '%s' can only be used for read-only devices" |
| 1937 | : "Driver '%s' is not whitelisted", |
| 1938 | drv->format_name); |
| 1939 | goto fail_opts; |
| 1940 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 1941 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1942 | |
Paolo Bonzini | d3faa13 | 2017-06-05 14:38:50 +0200 | [diff] [blame] | 1943 | /* bdrv_new() and bdrv_close() make it so */ |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 1944 | assert(qatomic_read(&bs->copy_on_read) == 0); |
Paolo Bonzini | d3faa13 | 2017-06-05 14:38:50 +0200 | [diff] [blame] | 1945 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1946 | if (bs->open_flags & BDRV_O_COPY_ON_READ) { |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1947 | if (!ro) { |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 1948 | bdrv_enable_copy_on_read(bs); |
| 1949 | } else { |
| 1950 | error_setg(errp, "Can't use copy-on-read on read-only device"); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1951 | ret = -EINVAL; |
| 1952 | goto fail_opts; |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 1953 | } |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 1954 | } |
| 1955 | |
Alberto Garcia | 415bbca | 2018-10-03 13:23:13 +0300 | [diff] [blame] | 1956 | discard = qemu_opt_get(opts, BDRV_OPT_DISCARD); |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1957 | if (discard != NULL) { |
| 1958 | if (bdrv_parse_discard_flags(discard, &bs->open_flags) != 0) { |
| 1959 | error_setg(errp, "Invalid discard option"); |
| 1960 | ret = -EINVAL; |
| 1961 | goto fail_opts; |
| 1962 | } |
| 1963 | } |
| 1964 | |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 1965 | bs->detect_zeroes = |
| 1966 | bdrv_parse_detect_zeroes(opts, bs->open_flags, &local_err); |
| 1967 | if (local_err) { |
| 1968 | error_propagate(errp, local_err); |
| 1969 | ret = -EINVAL; |
| 1970 | goto fail_opts; |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1971 | } |
| 1972 | |
Kevin Wolf | c2ad1b0 | 2013-03-18 16:40:51 +0100 | [diff] [blame] | 1973 | if (filename != NULL) { |
| 1974 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
| 1975 | } else { |
| 1976 | bs->filename[0] = '\0'; |
| 1977 | } |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 1978 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1979 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1980 | /* Open the image, either directly or using a protocol */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1981 | open_flags = bdrv_open_flags(bs, bs->open_flags); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1982 | node_name = qemu_opt_get(opts, "node-name"); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1983 | |
Paolo Bonzini | 41770f6 | 2022-11-24 16:21:18 +0100 | [diff] [blame] | 1984 | assert(!drv->protocol_name || file == NULL); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1985 | ret = bdrv_open_driver(bs, drv, node_name, options, open_flags, errp); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1986 | if (ret < 0) { |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1987 | goto fail_opts; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1988 | } |
| 1989 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1990 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1991 | return 0; |
| 1992 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1993 | fail_opts: |
| 1994 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1995 | return ret; |
| 1996 | } |
| 1997 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1998 | static QDict *parse_json_filename(const char *filename, Error **errp) |
| 1999 | { |
Zhao Liu | 7b22e05 | 2024-03-11 11:37:56 +0800 | [diff] [blame] | 2000 | ERRP_GUARD(); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 2001 | QObject *options_obj; |
| 2002 | QDict *options; |
| 2003 | int ret; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2004 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 2005 | |
| 2006 | ret = strstart(filename, "json:", &filename); |
| 2007 | assert(ret); |
| 2008 | |
Markus Armbruster | 5577fff | 2017-02-28 22:26:59 +0100 | [diff] [blame] | 2009 | options_obj = qobject_from_json(filename, errp); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 2010 | if (!options_obj) { |
Markus Armbruster | 5577fff | 2017-02-28 22:26:59 +0100 | [diff] [blame] | 2011 | error_prepend(errp, "Could not parse the JSON options: "); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 2012 | return NULL; |
| 2013 | } |
| 2014 | |
Max Reitz | 7dc847e | 2018-02-24 16:40:29 +0100 | [diff] [blame] | 2015 | options = qobject_to(QDict, options_obj); |
Markus Armbruster | ca6b6e1 | 2017-02-17 21:38:18 +0100 | [diff] [blame] | 2016 | if (!options) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2017 | qobject_unref(options_obj); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 2018 | error_setg(errp, "Invalid JSON object given"); |
| 2019 | return NULL; |
| 2020 | } |
| 2021 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 2022 | qdict_flatten(options); |
| 2023 | |
| 2024 | return options; |
| 2025 | } |
| 2026 | |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2027 | static void parse_json_protocol(QDict *options, const char **pfilename, |
| 2028 | Error **errp) |
| 2029 | { |
| 2030 | QDict *json_options; |
| 2031 | Error *local_err = NULL; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2032 | GLOBAL_STATE_CODE(); |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2033 | |
| 2034 | /* Parse json: pseudo-protocol */ |
| 2035 | if (!*pfilename || !g_str_has_prefix(*pfilename, "json:")) { |
| 2036 | return; |
| 2037 | } |
| 2038 | |
| 2039 | json_options = parse_json_filename(*pfilename, &local_err); |
| 2040 | if (local_err) { |
| 2041 | error_propagate(errp, local_err); |
| 2042 | return; |
| 2043 | } |
| 2044 | |
| 2045 | /* Options given in the filename have lower priority than options |
| 2046 | * specified directly */ |
| 2047 | qdict_join(options, json_options, false); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2048 | qobject_unref(json_options); |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2049 | *pfilename = NULL; |
| 2050 | } |
| 2051 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 2052 | /* |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2053 | * Fills in default options for opening images and converts the legacy |
| 2054 | * filename/flags pair to option QDict entries. |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2055 | * The BDRV_O_PROTOCOL flag in *flags will be set or cleared accordingly if a |
| 2056 | * block driver has been specified explicitly. |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2057 | */ |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2058 | static int bdrv_fill_options(QDict **options, const char *filename, |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 2059 | int *flags, bool allow_parse_filename, |
| 2060 | Error **errp) |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2061 | { |
| 2062 | const char *drvname; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2063 | bool protocol = *flags & BDRV_O_PROTOCOL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2064 | bool parse_filename = false; |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2065 | BlockDriver *drv = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2066 | Error *local_err = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2067 | |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2068 | GLOBAL_STATE_CODE(); |
| 2069 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2070 | /* |
| 2071 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 2072 | * types would require more care. When @options come from |
| 2073 | * -blockdev or blockdev_add, its members are typed according to |
| 2074 | * the QAPI schema, but when they come from -drive, they're all |
| 2075 | * QString. |
| 2076 | */ |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2077 | drvname = qdict_get_try_str(*options, "driver"); |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2078 | if (drvname) { |
| 2079 | drv = bdrv_find_format(drvname); |
| 2080 | if (!drv) { |
| 2081 | error_setg(errp, "Unknown driver '%s'", drvname); |
| 2082 | return -ENOENT; |
| 2083 | } |
| 2084 | /* If the user has explicitly specified the driver, this choice should |
| 2085 | * override the BDRV_O_PROTOCOL flag */ |
Paolo Bonzini | 41770f6 | 2022-11-24 16:21:18 +0100 | [diff] [blame] | 2086 | protocol = drv->protocol_name; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2087 | } |
| 2088 | |
| 2089 | if (protocol) { |
| 2090 | *flags |= BDRV_O_PROTOCOL; |
| 2091 | } else { |
| 2092 | *flags &= ~BDRV_O_PROTOCOL; |
| 2093 | } |
| 2094 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 2095 | /* Translate cache options from flags into options */ |
| 2096 | update_options_from_flags(*options, *flags); |
| 2097 | |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2098 | /* Fetch the file name from the options QDict if necessary */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2099 | if (protocol && filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2100 | if (!qdict_haskey(*options, "filename")) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2101 | qdict_put_str(*options, "filename", filename); |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 2102 | parse_filename = allow_parse_filename; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2103 | } else { |
| 2104 | error_setg(errp, "Can't specify 'file' and 'filename' options at " |
| 2105 | "the same time"); |
| 2106 | return -EINVAL; |
| 2107 | } |
| 2108 | } |
| 2109 | |
| 2110 | /* Find the right block driver */ |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2111 | /* See cautionary note on accessing @options above */ |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2112 | filename = qdict_get_try_str(*options, "filename"); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2113 | |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2114 | if (!drvname && protocol) { |
| 2115 | if (filename) { |
| 2116 | drv = bdrv_find_protocol(filename, parse_filename, errp); |
| 2117 | if (!drv) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2118 | return -EINVAL; |
| 2119 | } |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2120 | |
| 2121 | drvname = drv->format_name; |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2122 | qdict_put_str(*options, "driver", drvname); |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2123 | } else { |
| 2124 | error_setg(errp, "Must specify either driver or file"); |
| 2125 | return -EINVAL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2126 | } |
| 2127 | } |
| 2128 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2129 | assert(drv || !protocol); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2130 | |
| 2131 | /* Driver-specific filename parsing */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2132 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2133 | drv->bdrv_parse_filename(filename, *options, &local_err); |
| 2134 | if (local_err) { |
| 2135 | error_propagate(errp, local_err); |
| 2136 | return -EINVAL; |
| 2137 | } |
| 2138 | |
| 2139 | if (!drv->bdrv_needs_filename) { |
| 2140 | qdict_del(*options, "filename"); |
| 2141 | } |
| 2142 | } |
| 2143 | |
| 2144 | return 0; |
| 2145 | } |
| 2146 | |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2147 | typedef struct BlockReopenQueueEntry { |
| 2148 | bool prepared; |
| 2149 | BDRVReopenState state; |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 2150 | QTAILQ_ENTRY(BlockReopenQueueEntry) entry; |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2151 | } BlockReopenQueueEntry; |
| 2152 | |
| 2153 | /* |
| 2154 | * Return the flags that @bs will have after the reopens in @q have |
| 2155 | * successfully completed. If @q is NULL (or @bs is not contained in @q), |
| 2156 | * return the current flags. |
| 2157 | */ |
| 2158 | static int bdrv_reopen_get_flags(BlockReopenQueue *q, BlockDriverState *bs) |
| 2159 | { |
| 2160 | BlockReopenQueueEntry *entry; |
| 2161 | |
| 2162 | if (q != NULL) { |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 2163 | QTAILQ_FOREACH(entry, q, entry) { |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2164 | if (entry->state.bs == bs) { |
| 2165 | return entry->state.flags; |
| 2166 | } |
| 2167 | } |
| 2168 | } |
| 2169 | |
| 2170 | return bs->open_flags; |
| 2171 | } |
| 2172 | |
| 2173 | /* Returns whether the image file can be written to after the reopen queue @q |
| 2174 | * has been successfully applied, or right now if @q is NULL. */ |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2175 | static bool bdrv_is_writable_after_reopen(BlockDriverState *bs, |
| 2176 | BlockReopenQueue *q) |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2177 | { |
| 2178 | int flags = bdrv_reopen_get_flags(q, bs); |
| 2179 | |
| 2180 | return (flags & (BDRV_O_RDWR | BDRV_O_INACTIVE)) == BDRV_O_RDWR; |
| 2181 | } |
| 2182 | |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2183 | /* |
| 2184 | * Return whether the BDS can be written to. This is not necessarily |
| 2185 | * the same as !bdrv_is_read_only(bs), as inactivated images may not |
| 2186 | * be written to but do not count as read-only images. |
| 2187 | */ |
| 2188 | bool bdrv_is_writable(BlockDriverState *bs) |
| 2189 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 2190 | IO_CODE(); |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2191 | return bdrv_is_writable_after_reopen(bs, NULL); |
| 2192 | } |
| 2193 | |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2194 | static char *bdrv_child_user_desc(BdrvChild *c) |
| 2195 | { |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 2196 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | da261b6 | 2021-06-01 10:52:17 +0300 | [diff] [blame] | 2197 | return c->klass->get_parent_desc(c); |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2198 | } |
| 2199 | |
Vladimir Sementsov-Ogievskiy | 30ebb9a | 2021-06-01 10:52:18 +0300 | [diff] [blame] | 2200 | /* |
| 2201 | * Check that @a allows everything that @b needs. @a and @b must reference same |
| 2202 | * child node. |
| 2203 | */ |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2204 | static bool bdrv_a_allow_b(BdrvChild *a, BdrvChild *b, Error **errp) |
| 2205 | { |
Vladimir Sementsov-Ogievskiy | 30ebb9a | 2021-06-01 10:52:18 +0300 | [diff] [blame] | 2206 | const char *child_bs_name; |
| 2207 | g_autofree char *a_user = NULL; |
| 2208 | g_autofree char *b_user = NULL; |
| 2209 | g_autofree char *perms = NULL; |
| 2210 | |
| 2211 | assert(a->bs); |
| 2212 | assert(a->bs == b->bs); |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2213 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2214 | |
| 2215 | if ((b->perm & a->shared_perm) == b->perm) { |
| 2216 | return true; |
| 2217 | } |
| 2218 | |
Vladimir Sementsov-Ogievskiy | 30ebb9a | 2021-06-01 10:52:18 +0300 | [diff] [blame] | 2219 | child_bs_name = bdrv_get_node_name(b->bs); |
| 2220 | a_user = bdrv_child_user_desc(a); |
| 2221 | b_user = bdrv_child_user_desc(b); |
| 2222 | perms = bdrv_perm_names(b->perm & ~a->shared_perm); |
| 2223 | |
| 2224 | error_setg(errp, "Permission conflict on node '%s': permissions '%s' are " |
| 2225 | "both required by %s (uses node '%s' as '%s' child) and " |
| 2226 | "unshared by %s (uses node '%s' as '%s' child).", |
| 2227 | child_bs_name, perms, |
| 2228 | b_user, child_bs_name, b->name, |
| 2229 | a_user, child_bs_name, a->name); |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2230 | |
| 2231 | return false; |
| 2232 | } |
| 2233 | |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 2234 | static bool GRAPH_RDLOCK |
| 2235 | bdrv_parent_perms_conflict(BlockDriverState *bs, Error **errp) |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2236 | { |
| 2237 | BdrvChild *a, *b; |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2238 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2239 | |
| 2240 | /* |
| 2241 | * During the loop we'll look at each pair twice. That's correct because |
| 2242 | * bdrv_a_allow_b() is asymmetric and we should check each pair in both |
| 2243 | * directions. |
| 2244 | */ |
| 2245 | QLIST_FOREACH(a, &bs->parents, next_parent) { |
| 2246 | QLIST_FOREACH(b, &bs->parents, next_parent) { |
Vladimir Sementsov-Ogievskiy | 9397c14 | 2021-04-28 18:17:53 +0300 | [diff] [blame] | 2247 | if (a == b) { |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2248 | continue; |
| 2249 | } |
| 2250 | |
| 2251 | if (!bdrv_a_allow_b(a, b, errp)) { |
| 2252 | return true; |
| 2253 | } |
| 2254 | } |
| 2255 | } |
| 2256 | |
| 2257 | return false; |
| 2258 | } |
| 2259 | |
Kevin Wolf | c629b6d | 2023-09-11 11:46:14 +0200 | [diff] [blame] | 2260 | static void GRAPH_RDLOCK |
| 2261 | bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs, |
| 2262 | BdrvChild *c, BdrvChildRole role, |
| 2263 | BlockReopenQueue *reopen_queue, |
| 2264 | uint64_t parent_perm, uint64_t parent_shared, |
| 2265 | uint64_t *nperm, uint64_t *nshared) |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 2266 | { |
Alberto Garcia | 0b3ca76 | 2019-04-04 14:29:53 +0300 | [diff] [blame] | 2267 | assert(bs->drv && bs->drv->bdrv_child_perm); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2268 | GLOBAL_STATE_CODE(); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2269 | bs->drv->bdrv_child_perm(bs, c, role, reopen_queue, |
Alberto Garcia | 0b3ca76 | 2019-04-04 14:29:53 +0300 | [diff] [blame] | 2270 | parent_perm, parent_shared, |
| 2271 | nperm, nshared); |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 2272 | /* TODO Take force_share from reopen_queue */ |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 2273 | if (child_bs && child_bs->force_share) { |
| 2274 | *nshared = BLK_PERM_ALL; |
| 2275 | } |
| 2276 | } |
| 2277 | |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2278 | /* |
| 2279 | * Adds the whole subtree of @bs (including @bs itself) to the @list (except for |
| 2280 | * nodes that are already in the @list, of course) so that final list is |
| 2281 | * topologically sorted. Return the result (GSList @list object is updated, so |
| 2282 | * don't use old reference after function call). |
| 2283 | * |
| 2284 | * On function start @list must be already topologically sorted and for any node |
| 2285 | * in the @list the whole subtree of the node must be in the @list as well. The |
| 2286 | * simplest way to satisfy this criteria: use only result of |
| 2287 | * bdrv_topological_dfs() or NULL as @list parameter. |
| 2288 | */ |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 2289 | static GSList * GRAPH_RDLOCK |
| 2290 | bdrv_topological_dfs(GSList *list, GHashTable *found, BlockDriverState *bs) |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2291 | { |
| 2292 | BdrvChild *child; |
| 2293 | g_autoptr(GHashTable) local_found = NULL; |
| 2294 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2295 | GLOBAL_STATE_CODE(); |
| 2296 | |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2297 | if (!found) { |
| 2298 | assert(!list); |
| 2299 | found = local_found = g_hash_table_new(NULL, NULL); |
| 2300 | } |
| 2301 | |
| 2302 | if (g_hash_table_contains(found, bs)) { |
| 2303 | return list; |
| 2304 | } |
| 2305 | g_hash_table_add(found, bs); |
| 2306 | |
| 2307 | QLIST_FOREACH(child, &bs->children, next) { |
| 2308 | list = bdrv_topological_dfs(list, found, child->bs); |
| 2309 | } |
| 2310 | |
| 2311 | return g_slist_prepend(list, bs); |
| 2312 | } |
| 2313 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2314 | typedef struct BdrvChildSetPermState { |
| 2315 | BdrvChild *child; |
| 2316 | uint64_t old_perm; |
| 2317 | uint64_t old_shared_perm; |
| 2318 | } BdrvChildSetPermState; |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2319 | |
| 2320 | static void bdrv_child_set_perm_abort(void *opaque) |
| 2321 | { |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2322 | BdrvChildSetPermState *s = opaque; |
| 2323 | |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2324 | GLOBAL_STATE_CODE(); |
| 2325 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2326 | s->child->perm = s->old_perm; |
| 2327 | s->child->shared_perm = s->old_shared_perm; |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2328 | } |
| 2329 | |
| 2330 | static TransactionActionDrv bdrv_child_set_pem_drv = { |
| 2331 | .abort = bdrv_child_set_perm_abort, |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2332 | .clean = g_free, |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2333 | }; |
| 2334 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2335 | static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, |
| 2336 | uint64_t shared, Transaction *tran) |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2337 | { |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2338 | BdrvChildSetPermState *s = g_new(BdrvChildSetPermState, 1); |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2339 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2340 | |
| 2341 | *s = (BdrvChildSetPermState) { |
| 2342 | .child = c, |
| 2343 | .old_perm = c->perm, |
| 2344 | .old_shared_perm = c->shared_perm, |
| 2345 | }; |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2346 | |
| 2347 | c->perm = perm; |
| 2348 | c->shared_perm = shared; |
| 2349 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2350 | tran_add(tran, &bdrv_child_set_pem_drv, s); |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2351 | } |
| 2352 | |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2353 | static void GRAPH_RDLOCK bdrv_drv_set_perm_commit(void *opaque) |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2354 | { |
| 2355 | BlockDriverState *bs = opaque; |
| 2356 | uint64_t cumulative_perms, cumulative_shared_perms; |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2357 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2358 | |
| 2359 | if (bs->drv->bdrv_set_perm) { |
| 2360 | bdrv_get_cumulative_perm(bs, &cumulative_perms, |
| 2361 | &cumulative_shared_perms); |
| 2362 | bs->drv->bdrv_set_perm(bs, cumulative_perms, cumulative_shared_perms); |
| 2363 | } |
| 2364 | } |
| 2365 | |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2366 | static void GRAPH_RDLOCK bdrv_drv_set_perm_abort(void *opaque) |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2367 | { |
| 2368 | BlockDriverState *bs = opaque; |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2369 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2370 | |
| 2371 | if (bs->drv->bdrv_abort_perm_update) { |
| 2372 | bs->drv->bdrv_abort_perm_update(bs); |
| 2373 | } |
| 2374 | } |
| 2375 | |
| 2376 | TransactionActionDrv bdrv_drv_set_perm_drv = { |
| 2377 | .abort = bdrv_drv_set_perm_abort, |
| 2378 | .commit = bdrv_drv_set_perm_commit, |
| 2379 | }; |
| 2380 | |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2381 | /* |
| 2382 | * After calling this function, the transaction @tran may only be completed |
| 2383 | * while holding a reader lock for the graph. |
| 2384 | */ |
| 2385 | static int GRAPH_RDLOCK |
| 2386 | bdrv_drv_set_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared_perm, |
| 2387 | Transaction *tran, Error **errp) |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2388 | { |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2389 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2390 | if (!bs->drv) { |
| 2391 | return 0; |
| 2392 | } |
| 2393 | |
| 2394 | if (bs->drv->bdrv_check_perm) { |
| 2395 | int ret = bs->drv->bdrv_check_perm(bs, perm, shared_perm, errp); |
| 2396 | if (ret < 0) { |
| 2397 | return ret; |
| 2398 | } |
| 2399 | } |
| 2400 | |
| 2401 | if (tran) { |
| 2402 | tran_add(tran, &bdrv_drv_set_perm_drv, bs); |
| 2403 | } |
| 2404 | |
| 2405 | return 0; |
| 2406 | } |
| 2407 | |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2408 | typedef struct BdrvReplaceChildState { |
| 2409 | BdrvChild *child; |
| 2410 | BlockDriverState *old_bs; |
| 2411 | } BdrvReplaceChildState; |
| 2412 | |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 2413 | static void GRAPH_WRLOCK bdrv_replace_child_commit(void *opaque) |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2414 | { |
| 2415 | BdrvReplaceChildState *s = opaque; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2416 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2417 | |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 2418 | bdrv_schedule_unref(s->old_bs); |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2419 | } |
| 2420 | |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 2421 | static void GRAPH_WRLOCK bdrv_replace_child_abort(void *opaque) |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2422 | { |
| 2423 | BdrvReplaceChildState *s = opaque; |
| 2424 | BlockDriverState *new_bs = s->child->bs; |
| 2425 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2426 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 2427 | assert_bdrv_graph_writable(); |
Kevin Wolf | ad29eb3 | 2023-09-11 11:46:07 +0200 | [diff] [blame] | 2428 | |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 2429 | /* old_bs reference is transparently moved from @s to @s->child */ |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2430 | if (!s->child->bs) { |
| 2431 | /* |
| 2432 | * The parents were undrained when removing old_bs from the child. New |
| 2433 | * requests can't have been made, though, because the child was empty. |
| 2434 | * |
| 2435 | * TODO Make bdrv_replace_child_noperm() transactionable to avoid |
| 2436 | * undraining the parent in the first place. Once this is done, having |
| 2437 | * new_bs drained when calling bdrv_replace_child_tran() is not a |
| 2438 | * requirement any more. |
| 2439 | */ |
Kevin Wolf | 606ed75 | 2022-11-18 18:41:10 +0100 | [diff] [blame] | 2440 | bdrv_parent_drained_begin_single(s->child); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2441 | assert(!bdrv_parent_drained_poll_single(s->child)); |
| 2442 | } |
| 2443 | assert(s->child->quiesced_parent); |
Vladimir Sementsov-Ogievskiy | 544acc7 | 2022-07-26 23:11:31 +0300 | [diff] [blame] | 2444 | bdrv_replace_child_noperm(s->child, s->old_bs); |
Kevin Wolf | ad29eb3 | 2023-09-11 11:46:07 +0200 | [diff] [blame] | 2445 | |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2446 | bdrv_unref(new_bs); |
| 2447 | } |
| 2448 | |
| 2449 | static TransactionActionDrv bdrv_replace_child_drv = { |
| 2450 | .commit = bdrv_replace_child_commit, |
| 2451 | .abort = bdrv_replace_child_abort, |
| 2452 | .clean = g_free, |
| 2453 | }; |
| 2454 | |
| 2455 | /* |
Vladimir Sementsov-Ogievskiy | 4bf021d | 2021-06-10 14:25:44 +0300 | [diff] [blame] | 2456 | * bdrv_replace_child_tran |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2457 | * |
| 2458 | * Note: real unref of old_bs is done only on commit. |
Vladimir Sementsov-Ogievskiy | 4bf021d | 2021-06-10 14:25:44 +0300 | [diff] [blame] | 2459 | * |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2460 | * Both @child->bs and @new_bs (if non-NULL) must be drained. @new_bs must be |
| 2461 | * kept drained until the transaction is completed. |
| 2462 | * |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 2463 | * After calling this function, the transaction @tran may only be completed |
| 2464 | * while holding a writer lock for the graph. |
| 2465 | * |
Vladimir Sementsov-Ogievskiy | 4bf021d | 2021-06-10 14:25:44 +0300 | [diff] [blame] | 2466 | * The function doesn't update permissions, caller is responsible for this. |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2467 | */ |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 2468 | static void GRAPH_WRLOCK |
| 2469 | bdrv_replace_child_tran(BdrvChild *child, BlockDriverState *new_bs, |
| 2470 | Transaction *tran) |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2471 | { |
| 2472 | BdrvReplaceChildState *s = g_new(BdrvReplaceChildState, 1); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2473 | |
| 2474 | assert(child->quiesced_parent); |
| 2475 | assert(!new_bs || new_bs->quiesce_counter); |
| 2476 | |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2477 | *s = (BdrvReplaceChildState) { |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 2478 | .child = child, |
| 2479 | .old_bs = child->bs, |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2480 | }; |
| 2481 | tran_add(tran, &bdrv_replace_child_drv, s); |
| 2482 | |
| 2483 | if (new_bs) { |
| 2484 | bdrv_ref(new_bs); |
| 2485 | } |
Kevin Wolf | ad29eb3 | 2023-09-11 11:46:07 +0200 | [diff] [blame] | 2486 | |
Vladimir Sementsov-Ogievskiy | 544acc7 | 2022-07-26 23:11:31 +0300 | [diff] [blame] | 2487 | bdrv_replace_child_noperm(child, new_bs); |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 2488 | /* old_bs reference is transparently moved from @child to @s */ |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2489 | } |
| 2490 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2491 | /* |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2492 | * Refresh permissions in @bs subtree. The function is intended to be called |
| 2493 | * after some graph modification that was done without permission update. |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2494 | * |
| 2495 | * After calling this function, the transaction @tran may only be completed |
| 2496 | * while holding a reader lock for the graph. |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2497 | */ |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2498 | static int GRAPH_RDLOCK |
| 2499 | bdrv_node_refresh_perm(BlockDriverState *bs, BlockReopenQueue *q, |
| 2500 | Transaction *tran, Error **errp) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2501 | { |
| 2502 | BlockDriver *drv = bs->drv; |
| 2503 | BdrvChild *c; |
| 2504 | int ret; |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2505 | uint64_t cumulative_perms, cumulative_shared_perms; |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2506 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2507 | |
| 2508 | bdrv_get_cumulative_perm(bs, &cumulative_perms, &cumulative_shared_perms); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2509 | |
| 2510 | /* Write permissions never work with read-only images */ |
| 2511 | if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) && |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2512 | !bdrv_is_writable_after_reopen(bs, q)) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2513 | { |
Max Reitz | 481e0ee | 2019-05-15 22:15:00 +0200 | [diff] [blame] | 2514 | if (!bdrv_is_writable_after_reopen(bs, NULL)) { |
| 2515 | error_setg(errp, "Block node is read-only"); |
| 2516 | } else { |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2517 | error_setg(errp, "Read-only block node '%s' cannot support " |
| 2518 | "read-write users", bdrv_get_node_name(bs)); |
Max Reitz | 481e0ee | 2019-05-15 22:15:00 +0200 | [diff] [blame] | 2519 | } |
| 2520 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2521 | return -EPERM; |
| 2522 | } |
| 2523 | |
Kevin Wolf | 9c60a5d | 2020-07-16 16:26:00 +0200 | [diff] [blame] | 2524 | /* |
| 2525 | * Unaligned requests will automatically be aligned to bl.request_alignment |
| 2526 | * and without RESIZE we can't extend requests to write to space beyond the |
| 2527 | * end of the image, so it's required that the image size is aligned. |
| 2528 | */ |
| 2529 | if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) && |
| 2530 | !(cumulative_perms & BLK_PERM_RESIZE)) |
| 2531 | { |
| 2532 | if ((bs->total_sectors * BDRV_SECTOR_SIZE) % bs->bl.request_alignment) { |
| 2533 | error_setg(errp, "Cannot get 'write' permission without 'resize': " |
| 2534 | "Image size is not a multiple of request " |
| 2535 | "alignment"); |
| 2536 | return -EPERM; |
| 2537 | } |
| 2538 | } |
| 2539 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2540 | /* Check this node */ |
| 2541 | if (!drv) { |
| 2542 | return 0; |
| 2543 | } |
| 2544 | |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2545 | ret = bdrv_drv_set_perm(bs, cumulative_perms, cumulative_shared_perms, tran, |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2546 | errp); |
| 2547 | if (ret < 0) { |
| 2548 | return ret; |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2549 | } |
| 2550 | |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 2551 | /* Drivers that never have children can omit .bdrv_child_perm() */ |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2552 | if (!drv->bdrv_child_perm) { |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 2553 | assert(QLIST_EMPTY(&bs->children)); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2554 | return 0; |
| 2555 | } |
| 2556 | |
| 2557 | /* Check all children */ |
| 2558 | QLIST_FOREACH(c, &bs->children, next) { |
| 2559 | uint64_t cur_perm, cur_shared; |
Max Reitz | 9eab154 | 2019-05-22 19:03:50 +0200 | [diff] [blame] | 2560 | |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2561 | bdrv_child_perm(bs, c->bs, c, c->role, q, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 2562 | cumulative_perms, cumulative_shared_perms, |
| 2563 | &cur_perm, &cur_shared); |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2564 | bdrv_child_set_perm(c, cur_perm, cur_shared, tran); |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2565 | } |
| 2566 | |
| 2567 | return 0; |
| 2568 | } |
| 2569 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2570 | /* |
| 2571 | * @list is a product of bdrv_topological_dfs() (may be called several times) - |
| 2572 | * a topologically sorted subgraph. |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2573 | * |
| 2574 | * After calling this function, the transaction @tran may only be completed |
| 2575 | * while holding a reader lock for the graph. |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2576 | */ |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 2577 | static int GRAPH_RDLOCK |
| 2578 | bdrv_do_refresh_perms(GSList *list, BlockReopenQueue *q, Transaction *tran, |
| 2579 | Error **errp) |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2580 | { |
| 2581 | int ret; |
| 2582 | BlockDriverState *bs; |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2583 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2584 | |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2585 | for ( ; list; list = list->next) { |
| 2586 | bs = list->data; |
| 2587 | |
Vladimir Sementsov-Ogievskiy | 9397c14 | 2021-04-28 18:17:53 +0300 | [diff] [blame] | 2588 | if (bdrv_parent_perms_conflict(bs, errp)) { |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2589 | return -EINVAL; |
| 2590 | } |
| 2591 | |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2592 | ret = bdrv_node_refresh_perm(bs, q, tran, errp); |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2593 | if (ret < 0) { |
| 2594 | return ret; |
| 2595 | } |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2596 | } |
Vladimir Sementsov-Ogievskiy | 3ef45e0 | 2021-04-28 18:17:40 +0300 | [diff] [blame] | 2597 | |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2598 | return 0; |
| 2599 | } |
| 2600 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2601 | /* |
| 2602 | * @list is any list of nodes. List is completed by all subtrees and |
| 2603 | * topologically sorted. It's not a problem if some node occurs in the @list |
| 2604 | * several times. |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2605 | * |
| 2606 | * After calling this function, the transaction @tran may only be completed |
| 2607 | * while holding a reader lock for the graph. |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2608 | */ |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 2609 | static int GRAPH_RDLOCK |
| 2610 | bdrv_list_refresh_perms(GSList *list, BlockReopenQueue *q, Transaction *tran, |
| 2611 | Error **errp) |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2612 | { |
| 2613 | g_autoptr(GHashTable) found = g_hash_table_new(NULL, NULL); |
| 2614 | g_autoptr(GSList) refresh_list = NULL; |
| 2615 | |
| 2616 | for ( ; list; list = list->next) { |
| 2617 | refresh_list = bdrv_topological_dfs(refresh_list, found, list->data); |
| 2618 | } |
| 2619 | |
| 2620 | return bdrv_do_refresh_perms(refresh_list, q, tran, errp); |
| 2621 | } |
| 2622 | |
Kevin Wolf | c7a0f2b | 2020-03-10 12:38:25 +0100 | [diff] [blame] | 2623 | void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm, |
| 2624 | uint64_t *shared_perm) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2625 | { |
| 2626 | BdrvChild *c; |
| 2627 | uint64_t cumulative_perms = 0; |
| 2628 | uint64_t cumulative_shared_perms = BLK_PERM_ALL; |
| 2629 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 2630 | GLOBAL_STATE_CODE(); |
| 2631 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2632 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
| 2633 | cumulative_perms |= c->perm; |
| 2634 | cumulative_shared_perms &= c->shared_perm; |
| 2635 | } |
| 2636 | |
| 2637 | *perm = cumulative_perms; |
| 2638 | *shared_perm = cumulative_shared_perms; |
| 2639 | } |
| 2640 | |
Fam Zheng | 5176196 | 2017-05-03 00:35:36 +0800 | [diff] [blame] | 2641 | char *bdrv_perm_names(uint64_t perm) |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2642 | { |
| 2643 | struct perm_name { |
| 2644 | uint64_t perm; |
| 2645 | const char *name; |
| 2646 | } permissions[] = { |
| 2647 | { BLK_PERM_CONSISTENT_READ, "consistent read" }, |
| 2648 | { BLK_PERM_WRITE, "write" }, |
| 2649 | { BLK_PERM_WRITE_UNCHANGED, "write unchanged" }, |
| 2650 | { BLK_PERM_RESIZE, "resize" }, |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2651 | { 0, NULL } |
| 2652 | }; |
| 2653 | |
Alberto Garcia | e2a7423 | 2020-01-10 18:15:18 +0100 | [diff] [blame] | 2654 | GString *result = g_string_sized_new(30); |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2655 | struct perm_name *p; |
| 2656 | |
| 2657 | for (p = permissions; p->name; p++) { |
| 2658 | if (perm & p->perm) { |
Alberto Garcia | e2a7423 | 2020-01-10 18:15:18 +0100 | [diff] [blame] | 2659 | if (result->len > 0) { |
| 2660 | g_string_append(result, ", "); |
| 2661 | } |
| 2662 | g_string_append(result, p->name); |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2663 | } |
| 2664 | } |
| 2665 | |
Alberto Garcia | e2a7423 | 2020-01-10 18:15:18 +0100 | [diff] [blame] | 2666 | return g_string_free(result, FALSE); |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2667 | } |
| 2668 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2669 | |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2670 | /* |
| 2671 | * @tran is allowed to be NULL. In this case no rollback is possible. |
| 2672 | * |
| 2673 | * After calling this function, the transaction @tran may only be completed |
| 2674 | * while holding a reader lock for the graph. |
| 2675 | */ |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 2676 | static int GRAPH_RDLOCK |
| 2677 | bdrv_refresh_perms(BlockDriverState *bs, Transaction *tran, Error **errp) |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 2678 | { |
| 2679 | int ret; |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2680 | Transaction *local_tran = NULL; |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2681 | g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs); |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2682 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 2683 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2684 | if (!tran) { |
| 2685 | tran = local_tran = tran_new(); |
| 2686 | } |
| 2687 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2688 | ret = bdrv_do_refresh_perms(list, NULL, tran, errp); |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2689 | |
| 2690 | if (local_tran) { |
| 2691 | tran_finalize(local_tran, ret); |
| 2692 | } |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 2693 | |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2694 | return ret; |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 2695 | } |
| 2696 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2697 | int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, |
| 2698 | Error **errp) |
| 2699 | { |
Max Reitz | 1046779 | 2019-05-22 19:03:51 +0200 | [diff] [blame] | 2700 | Error *local_err = NULL; |
Vladimir Sementsov-Ogievskiy | 83928dc | 2021-04-28 18:17:39 +0300 | [diff] [blame] | 2701 | Transaction *tran = tran_new(); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2702 | int ret; |
| 2703 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 2704 | GLOBAL_STATE_CODE(); |
| 2705 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2706 | bdrv_child_set_perm(c, perm, shared, tran); |
Vladimir Sementsov-Ogievskiy | 83928dc | 2021-04-28 18:17:39 +0300 | [diff] [blame] | 2707 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2708 | ret = bdrv_refresh_perms(c->bs, tran, &local_err); |
Vladimir Sementsov-Ogievskiy | 83928dc | 2021-04-28 18:17:39 +0300 | [diff] [blame] | 2709 | |
| 2710 | tran_finalize(tran, ret); |
| 2711 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2712 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | 071b474 | 2020-11-06 15:42:41 +0300 | [diff] [blame] | 2713 | if ((perm & ~c->perm) || (c->shared_perm & ~shared)) { |
| 2714 | /* tighten permissions */ |
Max Reitz | 1046779 | 2019-05-22 19:03:51 +0200 | [diff] [blame] | 2715 | error_propagate(errp, local_err); |
| 2716 | } else { |
| 2717 | /* |
| 2718 | * Our caller may intend to only loosen restrictions and |
| 2719 | * does not expect this function to fail. Errors are not |
| 2720 | * fatal in such a case, so we can just hide them from our |
| 2721 | * caller. |
| 2722 | */ |
| 2723 | error_free(local_err); |
| 2724 | ret = 0; |
| 2725 | } |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2726 | } |
| 2727 | |
Vladimir Sementsov-Ogievskiy | 83928dc | 2021-04-28 18:17:39 +0300 | [diff] [blame] | 2728 | return ret; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2729 | } |
| 2730 | |
Max Reitz | c1087f1 | 2019-05-22 19:03:46 +0200 | [diff] [blame] | 2731 | int bdrv_child_refresh_perms(BlockDriverState *bs, BdrvChild *c, Error **errp) |
| 2732 | { |
| 2733 | uint64_t parent_perms, parent_shared; |
| 2734 | uint64_t perms, shared; |
| 2735 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 2736 | GLOBAL_STATE_CODE(); |
| 2737 | |
Max Reitz | c1087f1 | 2019-05-22 19:03:46 +0200 | [diff] [blame] | 2738 | bdrv_get_cumulative_perm(bs, &parent_perms, &parent_shared); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2739 | bdrv_child_perm(bs, c->bs, c, c->role, NULL, |
Max Reitz | bf8e925 | 2020-05-13 13:05:16 +0200 | [diff] [blame] | 2740 | parent_perms, parent_shared, &perms, &shared); |
Max Reitz | c1087f1 | 2019-05-22 19:03:46 +0200 | [diff] [blame] | 2741 | |
| 2742 | return bdrv_child_try_set_perm(c, perms, shared, errp); |
| 2743 | } |
| 2744 | |
Max Reitz | 87278af | 2020-05-13 13:05:40 +0200 | [diff] [blame] | 2745 | /* |
| 2746 | * Default implementation for .bdrv_child_perm() for block filters: |
| 2747 | * Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED, and RESIZE to the |
| 2748 | * filtered child. |
| 2749 | */ |
| 2750 | static void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c, |
Max Reitz | 87278af | 2020-05-13 13:05:40 +0200 | [diff] [blame] | 2751 | BdrvChildRole role, |
| 2752 | BlockReopenQueue *reopen_queue, |
| 2753 | uint64_t perm, uint64_t shared, |
| 2754 | uint64_t *nperm, uint64_t *nshared) |
Kevin Wolf | 6a1b9ee | 2016-12-15 11:27:32 +0100 | [diff] [blame] | 2755 | { |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2756 | GLOBAL_STATE_CODE(); |
Kevin Wolf | e444fa8 | 2019-08-02 15:59:41 +0200 | [diff] [blame] | 2757 | *nperm = perm & DEFAULT_PERM_PASSTHROUGH; |
| 2758 | *nshared = (shared & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHANGED; |
Kevin Wolf | 6a1b9ee | 2016-12-15 11:27:32 +0100 | [diff] [blame] | 2759 | } |
| 2760 | |
Max Reitz | 70082db | 2020-05-13 13:05:26 +0200 | [diff] [blame] | 2761 | static void bdrv_default_perms_for_cow(BlockDriverState *bs, BdrvChild *c, |
Max Reitz | 70082db | 2020-05-13 13:05:26 +0200 | [diff] [blame] | 2762 | BdrvChildRole role, |
| 2763 | BlockReopenQueue *reopen_queue, |
| 2764 | uint64_t perm, uint64_t shared, |
| 2765 | uint64_t *nperm, uint64_t *nshared) |
| 2766 | { |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2767 | assert(role & BDRV_CHILD_COW); |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2768 | GLOBAL_STATE_CODE(); |
Max Reitz | 70082db | 2020-05-13 13:05:26 +0200 | [diff] [blame] | 2769 | |
| 2770 | /* |
| 2771 | * We want consistent read from backing files if the parent needs it. |
| 2772 | * No other operations are performed on backing files. |
| 2773 | */ |
| 2774 | perm &= BLK_PERM_CONSISTENT_READ; |
| 2775 | |
| 2776 | /* |
| 2777 | * If the parent can deal with changing data, we're okay with a |
| 2778 | * writable and resizable backing file. |
| 2779 | * TODO Require !(perm & BLK_PERM_CONSISTENT_READ), too? |
| 2780 | */ |
| 2781 | if (shared & BLK_PERM_WRITE) { |
| 2782 | shared = BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2783 | } else { |
| 2784 | shared = 0; |
| 2785 | } |
| 2786 | |
Vladimir Sementsov-Ogievskiy | 64631f3 | 2021-09-02 12:37:54 +0300 | [diff] [blame] | 2787 | shared |= BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED; |
Max Reitz | 70082db | 2020-05-13 13:05:26 +0200 | [diff] [blame] | 2788 | |
| 2789 | if (bs->open_flags & BDRV_O_INACTIVE) { |
| 2790 | shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2791 | } |
| 2792 | |
| 2793 | *nperm = perm; |
| 2794 | *nshared = shared; |
| 2795 | } |
| 2796 | |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2797 | static void bdrv_default_perms_for_storage(BlockDriverState *bs, BdrvChild *c, |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2798 | BdrvChildRole role, |
| 2799 | BlockReopenQueue *reopen_queue, |
| 2800 | uint64_t perm, uint64_t shared, |
| 2801 | uint64_t *nperm, uint64_t *nshared) |
| 2802 | { |
| 2803 | int flags; |
| 2804 | |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2805 | GLOBAL_STATE_CODE(); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2806 | assert(role & (BDRV_CHILD_METADATA | BDRV_CHILD_DATA)); |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2807 | |
| 2808 | flags = bdrv_reopen_get_flags(reopen_queue, bs); |
| 2809 | |
| 2810 | /* |
| 2811 | * Apart from the modifications below, the same permissions are |
| 2812 | * forwarded and left alone as for filters |
| 2813 | */ |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2814 | bdrv_filter_default_perms(bs, c, role, reopen_queue, |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2815 | perm, shared, &perm, &shared); |
| 2816 | |
Max Reitz | f889054 | 2020-05-13 13:05:28 +0200 | [diff] [blame] | 2817 | if (role & BDRV_CHILD_METADATA) { |
| 2818 | /* Format drivers may touch metadata even if the guest doesn't write */ |
| 2819 | if (bdrv_is_writable_after_reopen(bs, reopen_queue)) { |
| 2820 | perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2821 | } |
| 2822 | |
| 2823 | /* |
| 2824 | * bs->file always needs to be consistent because of the |
| 2825 | * metadata. We can never allow other users to resize or write |
| 2826 | * to it. |
| 2827 | */ |
| 2828 | if (!(flags & BDRV_O_NO_IO)) { |
| 2829 | perm |= BLK_PERM_CONSISTENT_READ; |
| 2830 | } |
| 2831 | shared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2832 | } |
| 2833 | |
Max Reitz | f889054 | 2020-05-13 13:05:28 +0200 | [diff] [blame] | 2834 | if (role & BDRV_CHILD_DATA) { |
| 2835 | /* |
| 2836 | * Technically, everything in this block is a subset of the |
| 2837 | * BDRV_CHILD_METADATA path taken above, and so this could |
| 2838 | * be an "else if" branch. However, that is not obvious, and |
| 2839 | * this function is not performance critical, therefore we let |
| 2840 | * this be an independent "if". |
| 2841 | */ |
| 2842 | |
| 2843 | /* |
| 2844 | * We cannot allow other users to resize the file because the |
| 2845 | * format driver might have some assumptions about the size |
| 2846 | * (e.g. because it is stored in metadata, or because the file |
| 2847 | * is split into fixed-size data files). |
| 2848 | */ |
| 2849 | shared &= ~BLK_PERM_RESIZE; |
| 2850 | |
| 2851 | /* |
| 2852 | * WRITE_UNCHANGED often cannot be performed as such on the |
| 2853 | * data file. For example, the qcow2 driver may still need to |
| 2854 | * write copied clusters on copy-on-read. |
| 2855 | */ |
| 2856 | if (perm & BLK_PERM_WRITE_UNCHANGED) { |
| 2857 | perm |= BLK_PERM_WRITE; |
| 2858 | } |
| 2859 | |
| 2860 | /* |
| 2861 | * If the data file is written to, the format driver may |
| 2862 | * expect to be able to resize it by writing beyond the EOF. |
| 2863 | */ |
| 2864 | if (perm & BLK_PERM_WRITE) { |
| 2865 | perm |= BLK_PERM_RESIZE; |
| 2866 | } |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2867 | } |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2868 | |
| 2869 | if (bs->open_flags & BDRV_O_INACTIVE) { |
| 2870 | shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2871 | } |
| 2872 | |
| 2873 | *nperm = perm; |
| 2874 | *nshared = shared; |
| 2875 | } |
| 2876 | |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2877 | void bdrv_default_perms(BlockDriverState *bs, BdrvChild *c, |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2878 | BdrvChildRole role, BlockReopenQueue *reopen_queue, |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2879 | uint64_t perm, uint64_t shared, |
| 2880 | uint64_t *nperm, uint64_t *nshared) |
| 2881 | { |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 2882 | GLOBAL_STATE_CODE(); |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2883 | if (role & BDRV_CHILD_FILTERED) { |
| 2884 | assert(!(role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA | |
| 2885 | BDRV_CHILD_COW))); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2886 | bdrv_filter_default_perms(bs, c, role, reopen_queue, |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2887 | perm, shared, nperm, nshared); |
| 2888 | } else if (role & BDRV_CHILD_COW) { |
| 2889 | assert(!(role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA))); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2890 | bdrv_default_perms_for_cow(bs, c, role, reopen_queue, |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2891 | perm, shared, nperm, nshared); |
| 2892 | } else if (role & (BDRV_CHILD_METADATA | BDRV_CHILD_DATA)) { |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2893 | bdrv_default_perms_for_storage(bs, c, role, reopen_queue, |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2894 | perm, shared, nperm, nshared); |
| 2895 | } else { |
| 2896 | g_assert_not_reached(); |
| 2897 | } |
| 2898 | } |
| 2899 | |
Max Reitz | 7b1d9c4 | 2019-11-08 13:34:51 +0100 | [diff] [blame] | 2900 | uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm) |
| 2901 | { |
| 2902 | static const uint64_t permissions[] = { |
| 2903 | [BLOCK_PERMISSION_CONSISTENT_READ] = BLK_PERM_CONSISTENT_READ, |
| 2904 | [BLOCK_PERMISSION_WRITE] = BLK_PERM_WRITE, |
| 2905 | [BLOCK_PERMISSION_WRITE_UNCHANGED] = BLK_PERM_WRITE_UNCHANGED, |
| 2906 | [BLOCK_PERMISSION_RESIZE] = BLK_PERM_RESIZE, |
Max Reitz | 7b1d9c4 | 2019-11-08 13:34:51 +0100 | [diff] [blame] | 2907 | }; |
| 2908 | |
| 2909 | QEMU_BUILD_BUG_ON(ARRAY_SIZE(permissions) != BLOCK_PERMISSION__MAX); |
| 2910 | QEMU_BUILD_BUG_ON(1UL << ARRAY_SIZE(permissions) != BLK_PERM_ALL + 1); |
| 2911 | |
| 2912 | assert(qapi_perm < BLOCK_PERMISSION__MAX); |
| 2913 | |
| 2914 | return permissions[qapi_perm]; |
| 2915 | } |
| 2916 | |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2917 | /* |
| 2918 | * Replaces the node that a BdrvChild points to without updating permissions. |
| 2919 | * |
| 2920 | * If @new_bs is non-NULL, the parent of @child must already be drained through |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 2921 | * @child. |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2922 | */ |
Kevin Wolf | ad29eb3 | 2023-09-11 11:46:07 +0200 | [diff] [blame] | 2923 | static void GRAPH_WRLOCK |
| 2924 | bdrv_replace_child_noperm(BdrvChild *child, BlockDriverState *new_bs) |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2925 | { |
| 2926 | BlockDriverState *old_bs = child->bs; |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2927 | int new_bs_quiesce_counter; |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2928 | |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 2929 | assert(!child->frozen); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2930 | |
| 2931 | /* |
| 2932 | * If we want to change the BdrvChild to point to a drained node as its new |
| 2933 | * child->bs, we need to make sure that its new parent is drained, too. In |
| 2934 | * other words, either child->quiesce_parent must already be true or we must |
| 2935 | * be able to set it and keep the parent's quiesce_counter consistent with |
| 2936 | * that, but without polling or starting new requests (this function |
| 2937 | * guarantees that it doesn't poll, and starting new requests would be |
| 2938 | * against the invariants of drain sections). |
| 2939 | * |
| 2940 | * To keep things simple, we pick the first option (child->quiesce_parent |
| 2941 | * must already be true). We also generalise the rule a bit to make it |
| 2942 | * easier to verify in callers and more likely to be covered in test cases: |
| 2943 | * The parent must be quiesced through this child even if new_bs isn't |
| 2944 | * currently drained. |
| 2945 | * |
| 2946 | * The only exception is for callers that always pass new_bs == NULL. In |
| 2947 | * this case, we obviously never need to consider the case of a drained |
| 2948 | * new_bs, so we can keep the callers simpler by allowing them not to drain |
| 2949 | * the parent. |
| 2950 | */ |
| 2951 | assert(!new_bs || child->quiesced_parent); |
Kevin Wolf | bfb8aa6 | 2021-10-18 15:47:14 +0200 | [diff] [blame] | 2952 | assert(old_bs != new_bs); |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 2953 | GLOBAL_STATE_CODE(); |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 2954 | |
Fam Zheng | bb2614e | 2017-04-07 14:54:10 +0800 | [diff] [blame] | 2955 | if (old_bs && new_bs) { |
| 2956 | assert(bdrv_get_aio_context(old_bs) == bdrv_get_aio_context(new_bs)); |
| 2957 | } |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2958 | |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2959 | if (old_bs) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 2960 | if (child->klass->detach) { |
| 2961 | child->klass->detach(child); |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 2962 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2963 | QLIST_REMOVE(child, next_parent); |
| 2964 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2965 | |
| 2966 | child->bs = new_bs; |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2967 | |
| 2968 | if (new_bs) { |
| 2969 | QLIST_INSERT_HEAD(&new_bs->parents, child, next_parent); |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 2970 | if (child->klass->attach) { |
| 2971 | child->klass->attach(child); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 2972 | } |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2973 | } |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2974 | |
| 2975 | /* |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2976 | * If the parent was drained through this BdrvChild previously, but new_bs |
| 2977 | * is not drained, allow requests to come in only after the new node has |
| 2978 | * been attached. |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2979 | */ |
Kevin Wolf | 57e05be | 2022-11-18 18:41:06 +0100 | [diff] [blame] | 2980 | new_bs_quiesce_counter = (new_bs ? new_bs->quiesce_counter : 0); |
| 2981 | if (!new_bs_quiesce_counter && child->quiesced_parent) { |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2982 | bdrv_parent_drained_end_single(child); |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2983 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2984 | } |
| 2985 | |
Hanna Reitz | 04c9c3a | 2021-11-15 15:53:59 +0100 | [diff] [blame] | 2986 | /** |
| 2987 | * Free the given @child. |
| 2988 | * |
| 2989 | * The child must be empty (i.e. `child->bs == NULL`) and it must be |
| 2990 | * unused (i.e. not in a children list). |
| 2991 | */ |
| 2992 | static void bdrv_child_free(BdrvChild *child) |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 2993 | { |
| 2994 | assert(!child->bs); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2995 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 680e0cc | 2023-09-29 16:51:56 +0200 | [diff] [blame] | 2996 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 2997 | |
Hanna Reitz | a225369 | 2021-11-15 15:53:58 +0100 | [diff] [blame] | 2998 | assert(!child->next.le_prev); /* not in children list */ |
Hanna Reitz | 04c9c3a | 2021-11-15 15:53:59 +0100 | [diff] [blame] | 2999 | |
| 3000 | g_free(child->name); |
| 3001 | g_free(child); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3002 | } |
| 3003 | |
| 3004 | typedef struct BdrvAttachChildCommonState { |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3005 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3006 | AioContext *old_parent_ctx; |
| 3007 | AioContext *old_child_ctx; |
| 3008 | } BdrvAttachChildCommonState; |
| 3009 | |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 3010 | static void GRAPH_WRLOCK bdrv_attach_child_common_abort(void *opaque) |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3011 | { |
| 3012 | BdrvAttachChildCommonState *s = opaque; |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3013 | BlockDriverState *bs = s->child->bs; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3014 | |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 3015 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 3016 | assert_bdrv_graph_writable(); |
Kevin Wolf | ad29eb3 | 2023-09-11 11:46:07 +0200 | [diff] [blame] | 3017 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3018 | bdrv_replace_child_noperm(s->child, NULL); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3019 | |
| 3020 | if (bdrv_get_aio_context(bs) != s->old_child_ctx) { |
Emanuele Giuseppe Esposito | 142e690 | 2022-10-25 04:49:52 -0400 | [diff] [blame] | 3021 | bdrv_try_change_aio_context(bs, s->old_child_ctx, NULL, &error_abort); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3022 | } |
| 3023 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3024 | if (bdrv_child_get_parent_aio_context(s->child) != s->old_parent_ctx) { |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3025 | Transaction *tran; |
| 3026 | GHashTable *visited; |
| 3027 | bool ret; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3028 | |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3029 | tran = tran_new(); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3030 | |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3031 | /* No need to visit `child`, because it has been detached already */ |
| 3032 | visited = g_hash_table_new(NULL, NULL); |
| 3033 | ret = s->child->klass->change_aio_ctx(s->child, s->old_parent_ctx, |
| 3034 | visited, tran, &error_abort); |
| 3035 | g_hash_table_destroy(visited); |
| 3036 | |
| 3037 | /* transaction is supposed to always succeed */ |
| 3038 | assert(ret == true); |
| 3039 | tran_commit(tran); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3040 | } |
| 3041 | |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 3042 | bdrv_schedule_unref(bs); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3043 | bdrv_child_free(s->child); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3044 | } |
| 3045 | |
| 3046 | static TransactionActionDrv bdrv_attach_child_common_drv = { |
| 3047 | .abort = bdrv_attach_child_common_abort, |
| 3048 | .clean = g_free, |
| 3049 | }; |
| 3050 | |
| 3051 | /* |
| 3052 | * Common part of attaching bdrv child to bs or to blk or to job |
Vladimir Sementsov-Ogievskiy | f8d2ad7 | 2021-06-01 10:52:13 +0300 | [diff] [blame] | 3053 | * |
Vladimir Sementsov-Ogievskiy | 7ec390d | 2021-06-10 14:25:45 +0300 | [diff] [blame] | 3054 | * Function doesn't update permissions, caller is responsible for this. |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3055 | * |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 3056 | * After calling this function, the transaction @tran may only be completed |
| 3057 | * while holding a writer lock for the graph. |
| 3058 | * |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3059 | * Returns new created child. |
Kevin Wolf | c066e80 | 2023-06-05 10:57:05 +0200 | [diff] [blame] | 3060 | * |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 3061 | * Both @parent_bs and @child_bs can move to a different AioContext in this |
| 3062 | * function. |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3063 | */ |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3064 | static BdrvChild * GRAPH_WRLOCK |
| 3065 | bdrv_attach_child_common(BlockDriverState *child_bs, |
| 3066 | const char *child_name, |
| 3067 | const BdrvChildClass *child_class, |
| 3068 | BdrvChildRole child_role, |
| 3069 | uint64_t perm, uint64_t shared_perm, |
| 3070 | void *opaque, |
| 3071 | Transaction *tran, Error **errp) |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3072 | { |
| 3073 | BdrvChild *new_child; |
Stefan Hajnoczi | b49f475 | 2023-12-05 13:20:03 -0500 | [diff] [blame] | 3074 | AioContext *parent_ctx; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3075 | AioContext *child_ctx = bdrv_get_aio_context(child_bs); |
| 3076 | |
Vladimir Sementsov-Ogievskiy | da261b6 | 2021-06-01 10:52:17 +0300 | [diff] [blame] | 3077 | assert(child_class->get_parent_desc); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3078 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3079 | |
| 3080 | new_child = g_new(BdrvChild, 1); |
| 3081 | *new_child = (BdrvChild) { |
| 3082 | .bs = NULL, |
| 3083 | .name = g_strdup(child_name), |
| 3084 | .klass = child_class, |
| 3085 | .role = child_role, |
| 3086 | .perm = perm, |
| 3087 | .shared_perm = shared_perm, |
| 3088 | .opaque = opaque, |
| 3089 | }; |
| 3090 | |
| 3091 | /* |
| 3092 | * If the AioContexts don't match, first try to move the subtree of |
| 3093 | * child_bs into the AioContext of the new parent. If this doesn't work, |
| 3094 | * try moving the parent into the AioContext of child_bs instead. |
| 3095 | */ |
| 3096 | parent_ctx = bdrv_child_get_parent_aio_context(new_child); |
| 3097 | if (child_ctx != parent_ctx) { |
| 3098 | Error *local_err = NULL; |
Emanuele Giuseppe Esposito | 142e690 | 2022-10-25 04:49:52 -0400 | [diff] [blame] | 3099 | int ret = bdrv_try_change_aio_context(child_bs, parent_ctx, NULL, |
| 3100 | &local_err); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3101 | |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3102 | if (ret < 0 && child_class->change_aio_ctx) { |
Markus Armbruster | fb2575f | 2023-09-21 14:13:11 +0200 | [diff] [blame] | 3103 | Transaction *aio_ctx_tran = tran_new(); |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3104 | GHashTable *visited = g_hash_table_new(NULL, NULL); |
| 3105 | bool ret_child; |
| 3106 | |
| 3107 | g_hash_table_add(visited, new_child); |
| 3108 | ret_child = child_class->change_aio_ctx(new_child, child_ctx, |
Markus Armbruster | fb2575f | 2023-09-21 14:13:11 +0200 | [diff] [blame] | 3109 | visited, aio_ctx_tran, |
| 3110 | NULL); |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3111 | if (ret_child == true) { |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3112 | error_free(local_err); |
| 3113 | ret = 0; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3114 | } |
Markus Armbruster | fb2575f | 2023-09-21 14:13:11 +0200 | [diff] [blame] | 3115 | tran_finalize(aio_ctx_tran, ret_child == true ? 0 : -1); |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3116 | g_hash_table_destroy(visited); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3117 | } |
| 3118 | |
| 3119 | if (ret < 0) { |
| 3120 | error_propagate(errp, local_err); |
Hanna Reitz | 04c9c3a | 2021-11-15 15:53:59 +0100 | [diff] [blame] | 3121 | bdrv_child_free(new_child); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3122 | return NULL; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3123 | } |
| 3124 | } |
| 3125 | |
| 3126 | bdrv_ref(child_bs); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 3127 | /* |
| 3128 | * Let every new BdrvChild start with a drained parent. Inserting the child |
| 3129 | * in the graph with bdrv_replace_child_noperm() will undrain it if |
| 3130 | * @child_bs is not drained. |
| 3131 | * |
| 3132 | * The child was only just created and is not yet visible in global state |
| 3133 | * until bdrv_replace_child_noperm() inserts it into the graph, so nobody |
| 3134 | * could have sent requests and polling is not necessary. |
| 3135 | * |
| 3136 | * Note that this means that the parent isn't fully drained yet, we only |
| 3137 | * stop new requests from coming in. This is fine, we don't care about the |
| 3138 | * old requests here, they are not for this child. If another place enters a |
| 3139 | * drain section for the same parent, but wants it to be fully quiesced, it |
| 3140 | * will not run most of the the code in .drained_begin() again (which is not |
| 3141 | * a problem, we already did this), but it will still poll until the parent |
| 3142 | * is fully quiesced, so it will not be negatively affected either. |
| 3143 | */ |
Kevin Wolf | 606ed75 | 2022-11-18 18:41:10 +0100 | [diff] [blame] | 3144 | bdrv_parent_drained_begin_single(new_child); |
Vladimir Sementsov-Ogievskiy | 544acc7 | 2022-07-26 23:11:31 +0300 | [diff] [blame] | 3145 | bdrv_replace_child_noperm(new_child, child_bs); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3146 | |
| 3147 | BdrvAttachChildCommonState *s = g_new(BdrvAttachChildCommonState, 1); |
| 3148 | *s = (BdrvAttachChildCommonState) { |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3149 | .child = new_child, |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3150 | .old_parent_ctx = parent_ctx, |
| 3151 | .old_child_ctx = child_ctx, |
| 3152 | }; |
| 3153 | tran_add(tran, &bdrv_attach_child_common_drv, s); |
| 3154 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3155 | return new_child; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3156 | } |
| 3157 | |
Vladimir Sementsov-Ogievskiy | f8d2ad7 | 2021-06-01 10:52:13 +0300 | [diff] [blame] | 3158 | /* |
Vladimir Sementsov-Ogievskiy | 7ec390d | 2021-06-10 14:25:45 +0300 | [diff] [blame] | 3159 | * Function doesn't update permissions, caller is responsible for this. |
Kevin Wolf | c066e80 | 2023-06-05 10:57:05 +0200 | [diff] [blame] | 3160 | * |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 3161 | * Both @parent_bs and @child_bs can move to a different AioContext in this |
| 3162 | * function. |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 3163 | * |
| 3164 | * After calling this function, the transaction @tran may only be completed |
| 3165 | * while holding a writer lock for the graph. |
Vladimir Sementsov-Ogievskiy | f8d2ad7 | 2021-06-01 10:52:13 +0300 | [diff] [blame] | 3166 | */ |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3167 | static BdrvChild * GRAPH_WRLOCK |
| 3168 | bdrv_attach_child_noperm(BlockDriverState *parent_bs, |
| 3169 | BlockDriverState *child_bs, |
| 3170 | const char *child_name, |
| 3171 | const BdrvChildClass *child_class, |
| 3172 | BdrvChildRole child_role, |
| 3173 | Transaction *tran, |
| 3174 | Error **errp) |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3175 | { |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3176 | uint64_t perm, shared_perm; |
| 3177 | |
| 3178 | assert(parent_bs->drv); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3179 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3180 | |
Kevin Wolf | bfb8aa6 | 2021-10-18 15:47:14 +0200 | [diff] [blame] | 3181 | if (bdrv_recurse_has_child(child_bs, parent_bs)) { |
| 3182 | error_setg(errp, "Making '%s' a %s child of '%s' would create a cycle", |
| 3183 | child_bs->node_name, child_name, parent_bs->node_name); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3184 | return NULL; |
Kevin Wolf | bfb8aa6 | 2021-10-18 15:47:14 +0200 | [diff] [blame] | 3185 | } |
| 3186 | |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3187 | bdrv_get_cumulative_perm(parent_bs, &perm, &shared_perm); |
| 3188 | bdrv_child_perm(parent_bs, child_bs, NULL, child_role, NULL, |
| 3189 | perm, shared_perm, &perm, &shared_perm); |
| 3190 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3191 | return bdrv_attach_child_common(child_bs, child_name, child_class, |
| 3192 | child_role, perm, shared_perm, parent_bs, |
| 3193 | tran, errp); |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3194 | } |
| 3195 | |
Alberto Garcia | b441dc7 | 2019-05-13 16:46:18 +0300 | [diff] [blame] | 3196 | /* |
| 3197 | * This function steals the reference to child_bs from the caller. |
| 3198 | * That reference is later dropped by bdrv_root_unref_child(). |
| 3199 | * |
| 3200 | * On failure NULL is returned, errp is set and the reference to |
| 3201 | * child_bs is also dropped. |
| 3202 | */ |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3203 | BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, |
| 3204 | const char *child_name, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3205 | const BdrvChildClass *child_class, |
Max Reitz | 258b776 | 2020-05-13 13:05:15 +0200 | [diff] [blame] | 3206 | BdrvChildRole child_role, |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3207 | uint64_t perm, uint64_t shared_perm, |
| 3208 | void *opaque, Error **errp) |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3209 | { |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3210 | int ret; |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3211 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3212 | Transaction *tran = tran_new(); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3213 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 3214 | GLOBAL_STATE_CODE(); |
| 3215 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3216 | child = bdrv_attach_child_common(child_bs, child_name, child_class, |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3217 | child_role, perm, shared_perm, opaque, |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3218 | tran, errp); |
| 3219 | if (!child) { |
| 3220 | ret = -EINVAL; |
Kevin Wolf | e878bb1 | 2021-05-03 13:05:54 +0200 | [diff] [blame] | 3221 | goto out; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3222 | } |
| 3223 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 3224 | ret = bdrv_refresh_perms(child_bs, tran, errp); |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3225 | |
Kevin Wolf | e878bb1 | 2021-05-03 13:05:54 +0200 | [diff] [blame] | 3226 | out: |
| 3227 | tran_finalize(tran, ret); |
Vladimir Sementsov-Ogievskiy | f8d2ad7 | 2021-06-01 10:52:13 +0300 | [diff] [blame] | 3228 | |
Kevin Wolf | 03b9eac | 2023-10-27 17:53:13 +0200 | [diff] [blame] | 3229 | bdrv_schedule_unref(child_bs); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3230 | |
| 3231 | return ret < 0 ? NULL : child; |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3232 | } |
| 3233 | |
Alberto Garcia | b441dc7 | 2019-05-13 16:46:18 +0300 | [diff] [blame] | 3234 | /* |
| 3235 | * This function transfers the reference to child_bs from the caller |
| 3236 | * to parent_bs. That reference is later dropped by parent_bs on |
| 3237 | * bdrv_close() or if someone calls bdrv_unref_child(). |
| 3238 | * |
| 3239 | * On failure NULL is returned, errp is set and the reference to |
| 3240 | * child_bs is also dropped. |
| 3241 | */ |
Wen Congyang | 98292c6 | 2016-05-10 15:36:38 +0800 | [diff] [blame] | 3242 | BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, |
| 3243 | BlockDriverState *child_bs, |
| 3244 | const char *child_name, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3245 | const BdrvChildClass *child_class, |
Max Reitz | 258b776 | 2020-05-13 13:05:15 +0200 | [diff] [blame] | 3246 | BdrvChildRole child_role, |
Kevin Wolf | 8b2ff52 | 2016-12-20 22:21:17 +0100 | [diff] [blame] | 3247 | Error **errp) |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3248 | { |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3249 | int ret; |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3250 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3251 | Transaction *tran = tran_new(); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3252 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3253 | GLOBAL_STATE_CODE(); |
| 3254 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3255 | child = bdrv_attach_child_noperm(parent_bs, child_bs, child_name, |
| 3256 | child_class, child_role, tran, errp); |
| 3257 | if (!child) { |
| 3258 | ret = -EINVAL; |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3259 | goto out; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3260 | } |
| 3261 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 3262 | ret = bdrv_refresh_perms(parent_bs, tran, errp); |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3263 | if (ret < 0) { |
| 3264 | goto out; |
| 3265 | } |
| 3266 | |
| 3267 | out: |
| 3268 | tran_finalize(tran, ret); |
| 3269 | |
Kevin Wolf | afdaeb9 | 2023-09-11 11:46:11 +0200 | [diff] [blame] | 3270 | bdrv_schedule_unref(child_bs); |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3271 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3272 | return ret < 0 ? NULL : child; |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3273 | } |
| 3274 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 3275 | /* Callers must ensure that child->frozen is false. */ |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3276 | void bdrv_root_unref_child(BdrvChild *child) |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 3277 | { |
Vladimir Sementsov-Ogievskiy | 00eb93b | 2022-11-07 19:35:55 +0300 | [diff] [blame] | 3278 | BlockDriverState *child_bs = child->bs; |
Kevin Wolf | 779020c | 2015-10-13 14:09:44 +0200 | [diff] [blame] | 3279 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3280 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 00eb93b | 2022-11-07 19:35:55 +0300 | [diff] [blame] | 3281 | bdrv_replace_child_noperm(child, NULL); |
| 3282 | bdrv_child_free(child); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3283 | |
Vladimir Sementsov-Ogievskiy | 00eb93b | 2022-11-07 19:35:55 +0300 | [diff] [blame] | 3284 | if (child_bs) { |
| 3285 | /* |
| 3286 | * Update permissions for old node. We're just taking a parent away, so |
| 3287 | * we're loosening restrictions. Errors of permission update are not |
| 3288 | * fatal in this case, ignore them. |
| 3289 | */ |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 3290 | bdrv_refresh_perms(child_bs, NULL, NULL); |
Vladimir Sementsov-Ogievskiy | 00eb93b | 2022-11-07 19:35:55 +0300 | [diff] [blame] | 3291 | |
| 3292 | /* |
| 3293 | * When the parent requiring a non-default AioContext is removed, the |
| 3294 | * node moves back to the main AioContext |
| 3295 | */ |
| 3296 | bdrv_try_change_aio_context(child_bs, qemu_get_aio_context(), NULL, |
| 3297 | NULL); |
| 3298 | } |
| 3299 | |
Kevin Wolf | ede01e4 | 2023-09-11 11:46:18 +0200 | [diff] [blame] | 3300 | bdrv_schedule_unref(child_bs); |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3301 | } |
| 3302 | |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3303 | typedef struct BdrvSetInheritsFrom { |
| 3304 | BlockDriverState *bs; |
| 3305 | BlockDriverState *old_inherits_from; |
| 3306 | } BdrvSetInheritsFrom; |
| 3307 | |
| 3308 | static void bdrv_set_inherits_from_abort(void *opaque) |
| 3309 | { |
| 3310 | BdrvSetInheritsFrom *s = opaque; |
| 3311 | |
| 3312 | s->bs->inherits_from = s->old_inherits_from; |
| 3313 | } |
| 3314 | |
| 3315 | static TransactionActionDrv bdrv_set_inherits_from_drv = { |
| 3316 | .abort = bdrv_set_inherits_from_abort, |
| 3317 | .clean = g_free, |
| 3318 | }; |
| 3319 | |
| 3320 | /* @tran is allowed to be NULL. In this case no rollback is possible */ |
| 3321 | static void bdrv_set_inherits_from(BlockDriverState *bs, |
| 3322 | BlockDriverState *new_inherits_from, |
| 3323 | Transaction *tran) |
| 3324 | { |
| 3325 | if (tran) { |
| 3326 | BdrvSetInheritsFrom *s = g_new(BdrvSetInheritsFrom, 1); |
| 3327 | |
| 3328 | *s = (BdrvSetInheritsFrom) { |
| 3329 | .bs = bs, |
| 3330 | .old_inherits_from = bs->inherits_from, |
| 3331 | }; |
| 3332 | |
| 3333 | tran_add(tran, &bdrv_set_inherits_from_drv, s); |
| 3334 | } |
| 3335 | |
| 3336 | bs->inherits_from = new_inherits_from; |
| 3337 | } |
| 3338 | |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3339 | /** |
| 3340 | * Clear all inherits_from pointers from children and grandchildren of |
| 3341 | * @root that point to @root, where necessary. |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3342 | * @tran is allowed to be NULL. In this case no rollback is possible |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3343 | */ |
Kevin Wolf | 32a8aba | 2023-09-11 11:46:19 +0200 | [diff] [blame] | 3344 | static void GRAPH_WRLOCK |
| 3345 | bdrv_unset_inherits_from(BlockDriverState *root, BdrvChild *child, |
| 3346 | Transaction *tran) |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3347 | { |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3348 | BdrvChild *c; |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 3349 | |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3350 | if (child->bs->inherits_from == root) { |
| 3351 | /* |
| 3352 | * Remove inherits_from only when the last reference between root and |
| 3353 | * child->bs goes away. |
| 3354 | */ |
| 3355 | QLIST_FOREACH(c, &root->children, next) { |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 3356 | if (c != child && c->bs == child->bs) { |
| 3357 | break; |
| 3358 | } |
| 3359 | } |
| 3360 | if (c == NULL) { |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3361 | bdrv_set_inherits_from(child->bs, NULL, tran); |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 3362 | } |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 3363 | } |
| 3364 | |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3365 | QLIST_FOREACH(c, &child->bs->children, next) { |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3366 | bdrv_unset_inherits_from(root, c, tran); |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3367 | } |
| 3368 | } |
| 3369 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 3370 | /* Callers must ensure that child->frozen is false. */ |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3371 | void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) |
| 3372 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3373 | GLOBAL_STATE_CODE(); |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3374 | if (child == NULL) { |
| 3375 | return; |
| 3376 | } |
| 3377 | |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3378 | bdrv_unset_inherits_from(parent, child, NULL); |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3379 | bdrv_root_unref_child(child); |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 3380 | } |
| 3381 | |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 3382 | |
Kevin Wolf | 356f4ef | 2023-09-11 11:46:15 +0200 | [diff] [blame] | 3383 | static void GRAPH_RDLOCK |
| 3384 | bdrv_parent_cb_change_media(BlockDriverState *bs, bool load) |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 3385 | { |
| 3386 | BdrvChild *c; |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 3387 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 3388 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3389 | if (c->klass->change_media) { |
| 3390 | c->klass->change_media(c, load); |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 3391 | } |
| 3392 | } |
| 3393 | } |
| 3394 | |
Alberto Garcia | 0065c45 | 2018-10-31 18:16:37 +0200 | [diff] [blame] | 3395 | /* Return true if you can reach parent going through child->inherits_from |
| 3396 | * recursively. If parent or child are NULL, return false */ |
| 3397 | static bool bdrv_inherits_from_recursive(BlockDriverState *child, |
| 3398 | BlockDriverState *parent) |
| 3399 | { |
| 3400 | while (child && child != parent) { |
| 3401 | child = child->inherits_from; |
| 3402 | } |
| 3403 | |
| 3404 | return child != NULL; |
| 3405 | } |
| 3406 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3407 | /* |
Max Reitz | 25191e5 | 2020-05-13 13:05:33 +0200 | [diff] [blame] | 3408 | * Return the BdrvChildRole for @bs's backing child. bs->backing is |
| 3409 | * mostly used for COW backing children (role = COW), but also for |
| 3410 | * filtered children (role = FILTERED | PRIMARY). |
| 3411 | */ |
| 3412 | static BdrvChildRole bdrv_backing_role(BlockDriverState *bs) |
| 3413 | { |
| 3414 | if (bs->drv && bs->drv->is_filter) { |
| 3415 | return BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY; |
| 3416 | } else { |
| 3417 | return BDRV_CHILD_COW; |
| 3418 | } |
| 3419 | } |
| 3420 | |
| 3421 | /* |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3422 | * Sets the bs->backing or bs->file link of a BDS. A new reference is created; |
| 3423 | * callers which don't need their own reference any more must call bdrv_unref(). |
Vladimir Sementsov-Ogievskiy | 7ec390d | 2021-06-10 14:25:45 +0300 | [diff] [blame] | 3424 | * |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3425 | * If the respective child is already present (i.e. we're detaching a node), |
| 3426 | * that child node must be drained. |
| 3427 | * |
Vladimir Sementsov-Ogievskiy | 7ec390d | 2021-06-10 14:25:45 +0300 | [diff] [blame] | 3428 | * Function doesn't update permissions, caller is responsible for this. |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 3429 | * |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 3430 | * Both @parent_bs and @child_bs can move to a different AioContext in this |
| 3431 | * function. |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 3432 | * |
| 3433 | * After calling this function, the transaction @tran may only be completed |
| 3434 | * while holding a writer lock for the graph. |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3435 | */ |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3436 | static int GRAPH_WRLOCK |
| 3437 | bdrv_set_file_or_backing_noperm(BlockDriverState *parent_bs, |
| 3438 | BlockDriverState *child_bs, |
| 3439 | bool is_backing, |
| 3440 | Transaction *tran, Error **errp) |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3441 | { |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3442 | bool update_inherits_from = |
| 3443 | bdrv_inherits_from_recursive(child_bs, parent_bs); |
| 3444 | BdrvChild *child = is_backing ? parent_bs->backing : parent_bs->file; |
| 3445 | BdrvChildRole role; |
Alberto Garcia | 0065c45 | 2018-10-31 18:16:37 +0200 | [diff] [blame] | 3446 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3447 | GLOBAL_STATE_CODE(); |
| 3448 | |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3449 | if (!parent_bs->drv) { |
| 3450 | /* |
| 3451 | * Node without drv is an object without a class :/. TODO: finally fix |
| 3452 | * qcow2 driver to never clear bs->drv and implement format corruption |
| 3453 | * handling in other way. |
| 3454 | */ |
| 3455 | error_setg(errp, "Node corrupted"); |
| 3456 | return -EINVAL; |
| 3457 | } |
| 3458 | |
| 3459 | if (child && child->frozen) { |
| 3460 | error_setg(errp, "Cannot change frozen '%s' link from '%s' to '%s'", |
| 3461 | child->name, parent_bs->node_name, child->bs->node_name); |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3462 | return -EPERM; |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 3463 | } |
| 3464 | |
Vladimir Sementsov-Ogievskiy | 25f78d9 | 2021-06-10 15:05:34 +0300 | [diff] [blame] | 3465 | if (is_backing && !parent_bs->drv->is_filter && |
| 3466 | !parent_bs->drv->supports_backing) |
| 3467 | { |
| 3468 | error_setg(errp, "Driver '%s' of node '%s' does not support backing " |
| 3469 | "files", parent_bs->drv->format_name, parent_bs->node_name); |
| 3470 | return -EINVAL; |
| 3471 | } |
| 3472 | |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3473 | if (parent_bs->drv->is_filter) { |
| 3474 | role = BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY; |
| 3475 | } else if (is_backing) { |
| 3476 | role = BDRV_CHILD_COW; |
| 3477 | } else { |
| 3478 | /* |
| 3479 | * We only can use same role as it is in existing child. We don't have |
| 3480 | * infrastructure to determine role of file child in generic way |
| 3481 | */ |
| 3482 | if (!child) { |
| 3483 | error_setg(errp, "Cannot set file child to format node without " |
| 3484 | "file child"); |
| 3485 | return -EINVAL; |
| 3486 | } |
| 3487 | role = child->role; |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 3488 | } |
| 3489 | |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3490 | if (child) { |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3491 | assert(child->bs->quiesce_counter); |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3492 | bdrv_unset_inherits_from(parent_bs, child, tran); |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 3493 | bdrv_remove_child(child, tran); |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3494 | } |
| 3495 | |
| 3496 | if (!child_bs) { |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3497 | goto out; |
| 3498 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 3499 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3500 | child = bdrv_attach_child_noperm(parent_bs, child_bs, |
| 3501 | is_backing ? "backing" : "file", |
| 3502 | &child_of_bds, role, |
| 3503 | tran, errp); |
| 3504 | if (!child) { |
| 3505 | return -EINVAL; |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3506 | } |
| 3507 | |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3508 | |
| 3509 | /* |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3510 | * If inherits_from pointed recursively to bs then let's update it to |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3511 | * point directly to bs (else it will become NULL). |
| 3512 | */ |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3513 | if (update_inherits_from) { |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3514 | bdrv_set_inherits_from(child_bs, parent_bs, tran); |
Alberto Garcia | 0065c45 | 2018-10-31 18:16:37 +0200 | [diff] [blame] | 3515 | } |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 3516 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3517 | out: |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3518 | bdrv_refresh_limits(parent_bs, tran, NULL); |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3519 | |
| 3520 | return 0; |
| 3521 | } |
| 3522 | |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 3523 | /* |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 3524 | * Both @bs and @backing_hd can move to a different AioContext in this |
| 3525 | * function. |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3526 | * |
| 3527 | * If a backing child is already present (i.e. we're detaching a node), that |
| 3528 | * child node must be drained. |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 3529 | */ |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3530 | int bdrv_set_backing_hd_drained(BlockDriverState *bs, |
| 3531 | BlockDriverState *backing_hd, |
| 3532 | Error **errp) |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3533 | { |
| 3534 | int ret; |
| 3535 | Transaction *tran = tran_new(); |
| 3536 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3537 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3538 | assert(bs->quiesce_counter > 0); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3539 | if (bs->backing) { |
| 3540 | assert(bs->backing->bs->quiesce_counter > 0); |
| 3541 | } |
Vladimir Sementsov-Ogievskiy | c0829cb | 2022-01-24 18:37:41 +0100 | [diff] [blame] | 3542 | |
Kevin Wolf | 3204c2e | 2023-10-27 17:53:23 +0200 | [diff] [blame] | 3543 | ret = bdrv_set_file_or_backing_noperm(bs, backing_hd, true, tran, errp); |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3544 | if (ret < 0) { |
| 3545 | goto out; |
| 3546 | } |
| 3547 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 3548 | ret = bdrv_refresh_perms(bs, tran, errp); |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3549 | out: |
| 3550 | tran_finalize(tran, ret); |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3551 | return ret; |
| 3552 | } |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3553 | |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3554 | int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, |
| 3555 | Error **errp) |
| 3556 | { |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 3557 | BlockDriverState *drain_bs; |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3558 | int ret; |
| 3559 | GLOBAL_STATE_CODE(); |
| 3560 | |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 3561 | bdrv_graph_rdlock_main_loop(); |
| 3562 | drain_bs = bs->backing ? bs->backing->bs : bs; |
| 3563 | bdrv_graph_rdunlock_main_loop(); |
| 3564 | |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3565 | bdrv_ref(drain_bs); |
| 3566 | bdrv_drained_begin(drain_bs); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 3567 | bdrv_graph_wrlock(); |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3568 | ret = bdrv_set_backing_hd_drained(bs, backing_hd, errp); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 3569 | bdrv_graph_wrunlock(); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3570 | bdrv_drained_end(drain_bs); |
| 3571 | bdrv_unref(drain_bs); |
Vladimir Sementsov-Ogievskiy | c0829cb | 2022-01-24 18:37:41 +0100 | [diff] [blame] | 3572 | |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3573 | return ret; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3574 | } |
| 3575 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 3576 | /* |
| 3577 | * Opens the backing file for a BlockDriverState if not yet open |
| 3578 | * |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3579 | * bdref_key specifies the key for the image's BlockdevRef in the options QDict. |
| 3580 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 3581 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 3582 | * BlockdevRef. |
| 3583 | * |
| 3584 | * TODO Can this be unified with bdrv_open_image()? |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 3585 | */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3586 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, |
| 3587 | const char *bdref_key, Error **errp) |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3588 | { |
Zhao Liu | 7b22e05 | 2024-03-11 11:37:56 +0800 | [diff] [blame] | 3589 | ERRP_GUARD(); |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 3590 | char *backing_filename = NULL; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3591 | char *bdref_key_dot; |
| 3592 | const char *reference = NULL; |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 3593 | int ret = 0; |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 3594 | bool implicit_backing = false; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3595 | BlockDriverState *backing_hd; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3596 | QDict *options; |
| 3597 | QDict *tmp_parent_options = NULL; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 3598 | Error *local_err = NULL; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3599 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3600 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 3601 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3602 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3603 | if (bs->backing != NULL) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3604 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3605 | } |
| 3606 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 3607 | /* NULL means an empty set of options */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3608 | if (parent_options == NULL) { |
| 3609 | tmp_parent_options = qdict_new(); |
| 3610 | parent_options = tmp_parent_options; |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 3611 | } |
| 3612 | |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3613 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3614 | |
| 3615 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 3616 | qdict_extract_subqdict(parent_options, &options, bdref_key_dot); |
| 3617 | g_free(bdref_key_dot); |
| 3618 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 3619 | /* |
| 3620 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 3621 | * types would require more care. When @parent_options come from |
| 3622 | * -blockdev or blockdev_add, its members are typed according to |
| 3623 | * the QAPI schema, but when they come from -drive, they're all |
| 3624 | * QString. |
| 3625 | */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3626 | reference = qdict_get_try_str(parent_options, bdref_key); |
| 3627 | if (reference || qdict_haskey(options, "file.filename")) { |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 3628 | /* keep backing_filename NULL */ |
Kevin Wolf | 1cb6f50 | 2013-04-12 20:27:07 +0200 | [diff] [blame] | 3629 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3630 | qobject_unref(options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3631 | goto free_exit; |
Fam Zheng | dbecebd | 2013-09-22 20:05:06 +0800 | [diff] [blame] | 3632 | } else { |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 3633 | if (qdict_size(options) == 0) { |
| 3634 | /* If the user specifies options that do not modify the |
| 3635 | * backing file's behavior, we might still consider it the |
| 3636 | * implicit backing file. But it's easier this way, and |
| 3637 | * just specifying some of the backing BDS's options is |
| 3638 | * only possible with -drive anyway (otherwise the QAPI |
| 3639 | * schema forces the user to specify everything). */ |
| 3640 | implicit_backing = !strcmp(bs->auto_backing_file, bs->backing_file); |
| 3641 | } |
| 3642 | |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 3643 | backing_filename = bdrv_get_full_backing_filename(bs, &local_err); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 3644 | if (local_err) { |
| 3645 | ret = -EINVAL; |
| 3646 | error_propagate(errp, local_err); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3647 | qobject_unref(options); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 3648 | goto free_exit; |
| 3649 | } |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3650 | } |
| 3651 | |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 3652 | if (!bs->drv || !bs->drv->supports_backing) { |
| 3653 | ret = -EINVAL; |
| 3654 | error_setg(errp, "Driver doesn't support backing files"); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3655 | qobject_unref(options); |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 3656 | goto free_exit; |
| 3657 | } |
| 3658 | |
Peter Krempa | 6bff597 | 2017-10-12 16:14:10 +0200 | [diff] [blame] | 3659 | if (!reference && |
| 3660 | bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 3661 | qdict_put_str(options, "driver", bs->backing_format); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3662 | } |
| 3663 | |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 3664 | backing_hd = bdrv_open_inherit(backing_filename, reference, options, 0, bs, |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 3665 | &child_of_bds, bdrv_backing_role(bs), true, |
| 3666 | errp); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3667 | if (!backing_hd) { |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3668 | bs->open_flags |= BDRV_O_NO_BACKING; |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 3669 | error_prepend(errp, "Could not open backing file: "); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3670 | ret = -EINVAL; |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3671 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3672 | } |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3673 | |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 3674 | if (implicit_backing) { |
| 3675 | bdrv_refresh_filename(backing_hd); |
| 3676 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), |
| 3677 | backing_hd->filename); |
| 3678 | } |
| 3679 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3680 | /* Hook up the backing file link; drop our reference, bs owns the |
| 3681 | * backing_hd reference now */ |
Vladimir Sementsov-Ogievskiy | dc9c10a | 2021-02-02 15:49:47 +0300 | [diff] [blame] | 3682 | ret = bdrv_set_backing_hd(bs, backing_hd, errp); |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3683 | bdrv_unref(backing_hd); |
Kevin Wolf | 8aa0454 | 2023-06-05 10:57:08 +0200 | [diff] [blame] | 3684 | |
Vladimir Sementsov-Ogievskiy | dc9c10a | 2021-02-02 15:49:47 +0300 | [diff] [blame] | 3685 | if (ret < 0) { |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 3686 | goto free_exit; |
| 3687 | } |
Peter Feiner | d80ac65 | 2014-01-08 19:43:25 +0000 | [diff] [blame] | 3688 | |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3689 | qdict_del(parent_options, bdref_key); |
| 3690 | |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3691 | free_exit: |
| 3692 | g_free(backing_filename); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3693 | qobject_unref(tmp_parent_options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3694 | return ret; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3695 | } |
| 3696 | |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3697 | static BlockDriverState * |
| 3698 | bdrv_open_child_bs(const char *filename, QDict *options, const char *bdref_key, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3699 | BlockDriverState *parent, const BdrvChildClass *child_class, |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 3700 | BdrvChildRole child_role, bool allow_none, |
| 3701 | bool parse_filename, Error **errp) |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3702 | { |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3703 | BlockDriverState *bs = NULL; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3704 | QDict *image_options; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3705 | char *bdref_key_dot; |
| 3706 | const char *reference; |
| 3707 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3708 | assert(child_class != NULL); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3709 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3710 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 3711 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); |
| 3712 | g_free(bdref_key_dot); |
| 3713 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 3714 | /* |
| 3715 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 3716 | * types would require more care. When @options come from |
| 3717 | * -blockdev or blockdev_add, its members are typed according to |
| 3718 | * the QAPI schema, but when they come from -drive, they're all |
| 3719 | * QString. |
| 3720 | */ |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3721 | reference = qdict_get_try_str(options, bdref_key); |
| 3722 | if (!filename && !reference && !qdict_size(image_options)) { |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 3723 | if (!allow_none) { |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3724 | error_setg(errp, "A block device must be specified for \"%s\"", |
| 3725 | bdref_key); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3726 | } |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3727 | qobject_unref(image_options); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3728 | goto done; |
| 3729 | } |
| 3730 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3731 | bs = bdrv_open_inherit(filename, reference, image_options, 0, |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 3732 | parent, child_class, child_role, parse_filename, |
| 3733 | errp); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3734 | if (!bs) { |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3735 | goto done; |
| 3736 | } |
| 3737 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3738 | done: |
| 3739 | qdict_del(options, bdref_key); |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3740 | return bs; |
| 3741 | } |
| 3742 | |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 3743 | static BdrvChild *bdrv_open_child_common(const char *filename, |
| 3744 | QDict *options, const char *bdref_key, |
| 3745 | BlockDriverState *parent, |
| 3746 | const BdrvChildClass *child_class, |
| 3747 | BdrvChildRole child_role, |
| 3748 | bool allow_none, bool parse_filename, |
| 3749 | Error **errp) |
| 3750 | { |
| 3751 | BlockDriverState *bs; |
| 3752 | BdrvChild *child; |
| 3753 | |
| 3754 | GLOBAL_STATE_CODE(); |
| 3755 | |
| 3756 | bs = bdrv_open_child_bs(filename, options, bdref_key, parent, child_class, |
| 3757 | child_role, allow_none, parse_filename, errp); |
| 3758 | if (bs == NULL) { |
| 3759 | return NULL; |
| 3760 | } |
| 3761 | |
| 3762 | bdrv_graph_wrlock(); |
| 3763 | child = bdrv_attach_child(parent, bs, bdref_key, child_class, child_role, |
| 3764 | errp); |
| 3765 | bdrv_graph_wrunlock(); |
| 3766 | |
| 3767 | return child; |
| 3768 | } |
| 3769 | |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3770 | /* |
| 3771 | * Opens a disk image whose options are given as BlockdevRef in another block |
| 3772 | * device's options. |
| 3773 | * |
| 3774 | * If allow_none is true, no image will be opened if filename is false and no |
| 3775 | * BlockdevRef is given. NULL will be returned, but errp remains unset. |
| 3776 | * |
| 3777 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. |
| 3778 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 3779 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 3780 | * BlockdevRef. |
| 3781 | * |
| 3782 | * The BlockdevRef will be removed from the options QDict. |
Kevin Wolf | aa269ff | 2023-05-25 14:47:07 +0200 | [diff] [blame] | 3783 | * |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 3784 | * @parent can move to a different AioContext in this function. |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3785 | */ |
| 3786 | BdrvChild *bdrv_open_child(const char *filename, |
| 3787 | QDict *options, const char *bdref_key, |
| 3788 | BlockDriverState *parent, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3789 | const BdrvChildClass *child_class, |
Max Reitz | 258b776 | 2020-05-13 13:05:15 +0200 | [diff] [blame] | 3790 | BdrvChildRole child_role, |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3791 | bool allow_none, Error **errp) |
| 3792 | { |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 3793 | return bdrv_open_child_common(filename, options, bdref_key, parent, |
| 3794 | child_class, child_role, allow_none, false, |
| 3795 | errp); |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 3796 | } |
| 3797 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3798 | /* |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 3799 | * This does mostly the same as bdrv_open_child(), but for opening the primary |
| 3800 | * child of a node. A notable difference from bdrv_open_child() is that it |
| 3801 | * enables filename parsing for protocol names (including json:). |
Kevin Wolf | aa269ff | 2023-05-25 14:47:07 +0200 | [diff] [blame] | 3802 | * |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 3803 | * @parent can move to a different AioContext in this function. |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3804 | */ |
| 3805 | int bdrv_open_file_child(const char *filename, |
| 3806 | QDict *options, const char *bdref_key, |
| 3807 | BlockDriverState *parent, Error **errp) |
| 3808 | { |
| 3809 | BdrvChildRole role; |
| 3810 | |
| 3811 | /* commit_top and mirror_top don't use this function */ |
| 3812 | assert(!parent->drv->filtered_child_is_backing); |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3813 | role = parent->drv->is_filter ? |
| 3814 | (BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY) : BDRV_CHILD_IMAGE; |
| 3815 | |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 3816 | if (!bdrv_open_child_common(filename, options, bdref_key, parent, |
| 3817 | &child_of_bds, role, false, true, errp)) |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3818 | { |
| 3819 | return -EINVAL; |
| 3820 | } |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3821 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3822 | return 0; |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3823 | } |
| 3824 | |
| 3825 | /* |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3826 | * TODO Future callers may need to specify parent/child_class in order for |
| 3827 | * option inheritance to work. Existing callers use it for the root node. |
| 3828 | */ |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3829 | BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp) |
| 3830 | { |
| 3831 | BlockDriverState *bs = NULL; |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3832 | QObject *obj = NULL; |
| 3833 | QDict *qdict = NULL; |
| 3834 | const char *reference = NULL; |
| 3835 | Visitor *v = NULL; |
| 3836 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3837 | GLOBAL_STATE_CODE(); |
| 3838 | |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3839 | if (ref->type == QTYPE_QSTRING) { |
| 3840 | reference = ref->u.reference; |
| 3841 | } else { |
| 3842 | BlockdevOptions *options = &ref->u.definition; |
| 3843 | assert(ref->type == QTYPE_QDICT); |
| 3844 | |
| 3845 | v = qobject_output_visitor_new(&obj); |
Markus Armbruster | 1f58424 | 2020-04-24 10:43:35 +0200 | [diff] [blame] | 3846 | visit_type_BlockdevOptions(v, NULL, &options, &error_abort); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3847 | visit_complete(v, &obj); |
| 3848 | |
Max Reitz | 7dc847e | 2018-02-24 16:40:29 +0100 | [diff] [blame] | 3849 | qdict = qobject_to(QDict, obj); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3850 | qdict_flatten(qdict); |
| 3851 | |
| 3852 | /* bdrv_open_inherit() defaults to the values in bdrv_flags (for |
| 3853 | * compatibility with other callers) rather than what we want as the |
| 3854 | * real defaults. Apply the defaults here instead. */ |
| 3855 | qdict_set_default_str(qdict, BDRV_OPT_CACHE_DIRECT, "off"); |
| 3856 | qdict_set_default_str(qdict, BDRV_OPT_CACHE_NO_FLUSH, "off"); |
| 3857 | qdict_set_default_str(qdict, BDRV_OPT_READ_ONLY, "off"); |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 3858 | qdict_set_default_str(qdict, BDRV_OPT_AUTO_READ_ONLY, "off"); |
| 3859 | |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3860 | } |
| 3861 | |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 3862 | bs = bdrv_open_inherit(NULL, reference, qdict, 0, NULL, NULL, 0, false, |
| 3863 | errp); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3864 | obj = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3865 | qobject_unref(obj); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3866 | visit_free(v); |
| 3867 | return bs; |
| 3868 | } |
| 3869 | |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 3870 | static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs, |
| 3871 | int flags, |
| 3872 | QDict *snapshot_options, |
| 3873 | Error **errp) |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3874 | { |
Zhao Liu | 7b22e05 | 2024-03-11 11:37:56 +0800 | [diff] [blame] | 3875 | ERRP_GUARD(); |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 3876 | g_autofree char *tmp_filename = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3877 | int64_t total_size; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3878 | QemuOpts *opts = NULL; |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 3879 | BlockDriverState *bs_snapshot = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3880 | int ret; |
| 3881 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3882 | GLOBAL_STATE_CODE(); |
| 3883 | |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3884 | /* if snapshot, we create a temporary backing file and open it |
| 3885 | instead of opening 'filename' directly */ |
| 3886 | |
| 3887 | /* Get the required size from the image */ |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 3888 | total_size = bdrv_getlength(bs); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 3889 | |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 3890 | if (total_size < 0) { |
| 3891 | error_setg_errno(errp, -total_size, "Could not get image size"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3892 | goto out; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 3893 | } |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3894 | |
| 3895 | /* Create the temporary image */ |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 3896 | tmp_filename = create_tmp_file(errp); |
| 3897 | if (!tmp_filename) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3898 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3899 | } |
| 3900 | |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 3901 | opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0, |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 3902 | &error_abort); |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 3903 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size, &error_abort); |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 3904 | ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, errp); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3905 | qemu_opts_del(opts); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3906 | if (ret < 0) { |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 3907 | error_prepend(errp, "Could not create temporary overlay '%s': ", |
| 3908 | tmp_filename); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3909 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3910 | } |
| 3911 | |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 3912 | /* Prepare options QDict for the temporary file */ |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 3913 | qdict_put_str(snapshot_options, "file.driver", "file"); |
| 3914 | qdict_put_str(snapshot_options, "file.filename", tmp_filename); |
| 3915 | qdict_put_str(snapshot_options, "driver", "qcow2"); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3916 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3917 | bs_snapshot = bdrv_open(NULL, NULL, snapshot_options, flags, errp); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 3918 | snapshot_options = NULL; |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3919 | if (!bs_snapshot) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3920 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3921 | } |
| 3922 | |
Vladimir Sementsov-Ogievskiy | 934aee1 | 2021-02-02 15:49:44 +0300 | [diff] [blame] | 3923 | ret = bdrv_append(bs_snapshot, bs, errp); |
| 3924 | if (ret < 0) { |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 3925 | bs_snapshot = NULL; |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 3926 | goto out; |
| 3927 | } |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3928 | |
| 3929 | out: |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3930 | qobject_unref(snapshot_options); |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 3931 | return bs_snapshot; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3932 | } |
| 3933 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3934 | /* |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 3935 | * Opens a disk image (raw, qcow2, vmdk, ...) |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 3936 | * |
| 3937 | * options is a QDict of options to pass to the block drivers, or NULL for an |
| 3938 | * empty set of options. The reference to the QDict belongs to the block layer |
| 3939 | * after the call (even on failure), so if the caller intends to reuse the |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3940 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3941 | * |
| 3942 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. |
| 3943 | * If it is not NULL, the referenced BDS will be reused. |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3944 | * |
| 3945 | * The reference parameter may be used to specify an existing block device which |
| 3946 | * should be opened. If specified, neither options nor a filename may be given, |
| 3947 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 3948 | */ |
Kevin Wolf | 3219230 | 2023-01-26 18:24:32 +0100 | [diff] [blame] | 3949 | static BlockDriverState * no_coroutine_fn |
| 3950 | bdrv_open_inherit(const char *filename, const char *reference, QDict *options, |
| 3951 | int flags, BlockDriverState *parent, |
| 3952 | const BdrvChildClass *child_class, BdrvChildRole child_role, |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 3953 | bool parse_filename, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3954 | { |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 3955 | int ret; |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 3956 | BlockBackend *file = NULL; |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 3957 | BlockDriverState *bs; |
Max Reitz | ce34377 | 2015-08-26 19:47:50 +0200 | [diff] [blame] | 3958 | BlockDriver *drv = NULL; |
Alberto Garcia | 2f624b8 | 2018-06-29 14:37:00 +0300 | [diff] [blame] | 3959 | BdrvChild *child; |
Kevin Wolf | 74fe54f | 2013-07-09 11:09:02 +0200 | [diff] [blame] | 3960 | const char *drvname; |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 3961 | const char *backing; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 3962 | Error *local_err = NULL; |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 3963 | QDict *snapshot_options = NULL; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 3964 | int snapshot_flags = 0; |
bellard | 712e787 | 2005-04-28 21:09:32 +0000 | [diff] [blame] | 3965 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3966 | assert(!child_class || !flags); |
| 3967 | assert(!child_class == !parent); |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 3968 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 3219230 | 2023-01-26 18:24:32 +0100 | [diff] [blame] | 3969 | assert(!qemu_in_coroutine()); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3970 | |
Kevin Wolf | 356f4ef | 2023-09-11 11:46:15 +0200 | [diff] [blame] | 3971 | /* TODO We'll eventually have to take a writer lock in this function */ |
| 3972 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 3973 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3974 | if (reference) { |
| 3975 | bool options_non_empty = options ? qdict_size(options) : false; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3976 | qobject_unref(options); |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3977 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3978 | if (filename || options_non_empty) { |
| 3979 | error_setg(errp, "Cannot reference an existing block device with " |
| 3980 | "additional options or a new filename"); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3981 | return NULL; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3982 | } |
| 3983 | |
| 3984 | bs = bdrv_lookup_bs(reference, reference, errp); |
| 3985 | if (!bs) { |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3986 | return NULL; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3987 | } |
Kevin Wolf | 76b2232 | 2016-04-04 17:11:13 +0200 | [diff] [blame] | 3988 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3989 | bdrv_ref(bs); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3990 | return bs; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3991 | } |
| 3992 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3993 | bs = bdrv_new(); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3994 | |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 3995 | /* NULL means an empty set of options */ |
| 3996 | if (options == NULL) { |
| 3997 | options = qdict_new(); |
| 3998 | } |
| 3999 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 4000 | /* json: syntax counts as explicit options, as if in the QDict */ |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 4001 | if (parse_filename) { |
| 4002 | parse_json_protocol(options, &filename, &local_err); |
| 4003 | if (local_err) { |
| 4004 | goto fail; |
| 4005 | } |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 4006 | } |
| 4007 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 4008 | bs->explicit_options = qdict_clone_shallow(options); |
| 4009 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 4010 | if (child_class) { |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4011 | bool parent_is_format; |
| 4012 | |
| 4013 | if (parent->drv) { |
| 4014 | parent_is_format = parent->drv->is_format; |
| 4015 | } else { |
| 4016 | /* |
| 4017 | * parent->drv is not set yet because this node is opened for |
| 4018 | * (potential) format probing. That means that @parent is going |
| 4019 | * to be a format node. |
| 4020 | */ |
| 4021 | parent_is_format = true; |
| 4022 | } |
| 4023 | |
Kevin Wolf | bddcec3 | 2015-04-09 18:47:50 +0200 | [diff] [blame] | 4024 | bs->inherits_from = parent; |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4025 | child_class->inherit_options(child_role, parent_is_format, |
| 4026 | &flags, options, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 4027 | parent->open_flags, parent->options); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 4028 | } |
| 4029 | |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 4030 | ret = bdrv_fill_options(&options, filename, &flags, parse_filename, |
| 4031 | &local_err); |
Philippe Mathieu-Daudé | dfde483 | 2020-04-22 15:31:44 +0200 | [diff] [blame] | 4032 | if (ret < 0) { |
Kevin Wolf | 462f5bc | 2014-05-26 11:39:55 +0200 | [diff] [blame] | 4033 | goto fail; |
| 4034 | } |
| 4035 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 4036 | /* |
| 4037 | * Set the BDRV_O_RDWR and BDRV_O_ALLOW_RDWR flags. |
| 4038 | * Caution: getting a boolean member of @options requires care. |
| 4039 | * When @options come from -blockdev or blockdev_add, members are |
| 4040 | * typed according to the QAPI schema, but when they come from |
| 4041 | * -drive, they're all QString. |
| 4042 | */ |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 4043 | if (g_strcmp0(qdict_get_try_str(options, BDRV_OPT_READ_ONLY), "on") && |
| 4044 | !qdict_get_try_bool(options, BDRV_OPT_READ_ONLY, false)) { |
| 4045 | flags |= (BDRV_O_RDWR | BDRV_O_ALLOW_RDWR); |
| 4046 | } else { |
| 4047 | flags &= ~BDRV_O_RDWR; |
Alberto Garcia | 14499ea | 2016-09-15 17:53:00 +0300 | [diff] [blame] | 4048 | } |
| 4049 | |
| 4050 | if (flags & BDRV_O_SNAPSHOT) { |
| 4051 | snapshot_options = qdict_new(); |
| 4052 | bdrv_temp_snapshot_options(&snapshot_flags, snapshot_options, |
| 4053 | flags, options); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 4054 | /* Let bdrv_backing_options() override "read-only" */ |
| 4055 | qdict_del(options, BDRV_OPT_READ_ONLY); |
Max Reitz | 00ff7ff | 2020-05-13 13:05:21 +0200 | [diff] [blame] | 4056 | bdrv_inherited_options(BDRV_CHILD_COW, true, |
| 4057 | &flags, options, flags, options); |
Alberto Garcia | 14499ea | 2016-09-15 17:53:00 +0300 | [diff] [blame] | 4058 | } |
| 4059 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 4060 | bs->open_flags = flags; |
| 4061 | bs->options = options; |
| 4062 | options = qdict_clone_shallow(options); |
| 4063 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4064 | /* Find the right image format driver */ |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 4065 | /* See cautionary note on accessing @options above */ |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4066 | drvname = qdict_get_try_str(options, "driver"); |
| 4067 | if (drvname) { |
| 4068 | drv = bdrv_find_format(drvname); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4069 | if (!drv) { |
| 4070 | error_setg(errp, "Unknown driver: '%s'", drvname); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4071 | goto fail; |
| 4072 | } |
| 4073 | } |
| 4074 | |
| 4075 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4076 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 4077 | /* See cautionary note on accessing @options above */ |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 4078 | backing = qdict_get_try_str(options, "backing"); |
Max Reitz | e59a0cf | 2018-02-24 16:40:32 +0100 | [diff] [blame] | 4079 | if (qobject_to(QNull, qdict_get(options, "backing")) != NULL || |
| 4080 | (backing && *backing == '\0')) |
| 4081 | { |
Max Reitz | 4f7be28 | 2018-02-24 16:40:33 +0100 | [diff] [blame] | 4082 | if (backing) { |
| 4083 | warn_report("Use of \"backing\": \"\" is deprecated; " |
| 4084 | "use \"backing\": null instead"); |
| 4085 | } |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 4086 | flags |= BDRV_O_NO_BACKING; |
Kevin Wolf | ae0f57f | 2019-11-08 09:36:35 +0100 | [diff] [blame] | 4087 | qdict_del(bs->explicit_options, "backing"); |
| 4088 | qdict_del(bs->options, "backing"); |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 4089 | qdict_del(options, "backing"); |
| 4090 | } |
| 4091 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4092 | /* Open image file without format layer. This BlockBackend is only used for |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 4093 | * probing, the block drivers will do their own bdrv_open_child() for the |
| 4094 | * same BDS, which is why we put the node name back into options. */ |
Kevin Wolf | f4788ad | 2014-06-03 16:44:19 +0200 | [diff] [blame] | 4095 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4096 | BlockDriverState *file_bs; |
| 4097 | |
| 4098 | file_bs = bdrv_open_child_bs(filename, options, "file", bs, |
Max Reitz | 5894440 | 2020-05-13 13:05:37 +0200 | [diff] [blame] | 4099 | &child_of_bds, BDRV_CHILD_IMAGE, |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 4100 | true, true, &local_err); |
Kevin Wolf | 1fdd693 | 2015-06-15 14:11:51 +0200 | [diff] [blame] | 4101 | if (local_err) { |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 4102 | goto fail; |
| 4103 | } |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4104 | if (file_bs != NULL) { |
Kevin Wolf | dacaa16 | 2017-11-20 14:59:13 +0100 | [diff] [blame] | 4105 | /* Not requesting BLK_PERM_CONSISTENT_READ because we're only |
| 4106 | * looking at the header to guess the image format. This works even |
| 4107 | * in cases where a guest would not see a consistent state. */ |
Stefan Hajnoczi | b49f475 | 2023-12-05 13:20:03 -0500 | [diff] [blame] | 4108 | AioContext *ctx = bdrv_get_aio_context(file_bs); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4109 | file = blk_new(ctx, 0, BLK_PERM_ALL); |
Kevin Wolf | d708642 | 2017-01-13 19:02:32 +0100 | [diff] [blame] | 4110 | blk_insert_bs(file, file_bs, &local_err); |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4111 | bdrv_unref(file_bs); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4112 | |
Kevin Wolf | d708642 | 2017-01-13 19:02:32 +0100 | [diff] [blame] | 4113 | if (local_err) { |
| 4114 | goto fail; |
| 4115 | } |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4116 | |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 4117 | qdict_put_str(options, "file", bdrv_get_node_name(file_bs)); |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 4118 | } |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 4119 | } |
| 4120 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4121 | /* Image format probing */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 4122 | bs->probed = !drv; |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4123 | if (!drv && file) { |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 4124 | ret = find_image_format(file, filename, &drv, &local_err); |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 4125 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 4126 | goto fail; |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 4127 | } |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 4128 | /* |
| 4129 | * This option update would logically belong in bdrv_fill_options(), |
| 4130 | * but we first need to open bs->file for the probing to work, while |
| 4131 | * opening bs->file already requires the (mostly) final set of options |
| 4132 | * so that cache mode etc. can be inherited. |
| 4133 | * |
| 4134 | * Adding the driver later is somewhat ugly, but it's not an option |
| 4135 | * that would ever be inherited, so it's correct. We just need to make |
| 4136 | * sure to update both bs->options (which has the full effective |
| 4137 | * options for bs) and options (which has file.* already removed). |
| 4138 | */ |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 4139 | qdict_put_str(bs->options, "driver", drv->format_name); |
| 4140 | qdict_put_str(options, "driver", drv->format_name); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4141 | } else if (!drv) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 4142 | error_setg(errp, "Must specify either driver or file"); |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 4143 | goto fail; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 4144 | } |
| 4145 | |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 4146 | /* BDRV_O_PROTOCOL must be set iff a protocol BDS is about to be created */ |
Paolo Bonzini | 41770f6 | 2022-11-24 16:21:18 +0100 | [diff] [blame] | 4147 | assert(!!(flags & BDRV_O_PROTOCOL) == !!drv->protocol_name); |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 4148 | /* file must be NULL if a protocol BDS is about to be created |
| 4149 | * (the inverse results in an error message from bdrv_open_common()) */ |
| 4150 | assert(!(flags & BDRV_O_PROTOCOL) || !file); |
| 4151 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4152 | /* Open the image */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 4153 | ret = bdrv_open_common(bs, file, options, &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4154 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 4155 | goto fail; |
Christoph Hellwig | 6987307 | 2010-01-20 18:13:25 +0100 | [diff] [blame] | 4156 | } |
| 4157 | |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 4158 | if (file) { |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4159 | blk_unref(file); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 4160 | file = NULL; |
| 4161 | } |
| 4162 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4163 | /* If there is a backing file, use it */ |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 4164 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 4165 | ret = bdrv_open_backing_file(bs, options, "backing", &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4166 | if (ret < 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4167 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4168 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4169 | } |
| 4170 | |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 4171 | /* Remove all children options and references |
| 4172 | * from bs->options and bs->explicit_options */ |
Alberto Garcia | 2f624b8 | 2018-06-29 14:37:00 +0300 | [diff] [blame] | 4173 | QLIST_FOREACH(child, &bs->children, next) { |
| 4174 | char *child_key_dot; |
| 4175 | child_key_dot = g_strdup_printf("%s.", child->name); |
| 4176 | qdict_extract_subqdict(bs->explicit_options, NULL, child_key_dot); |
| 4177 | qdict_extract_subqdict(bs->options, NULL, child_key_dot); |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 4178 | qdict_del(bs->explicit_options, child->name); |
| 4179 | qdict_del(bs->options, child->name); |
Alberto Garcia | 2f624b8 | 2018-06-29 14:37:00 +0300 | [diff] [blame] | 4180 | g_free(child_key_dot); |
| 4181 | } |
| 4182 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4183 | /* Check if any unknown options were used */ |
Paolo Bonzini | 7ad2757 | 2017-01-04 15:59:14 +0100 | [diff] [blame] | 4184 | if (qdict_size(options) != 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4185 | const QDictEntry *entry = qdict_first(options); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 4186 | if (flags & BDRV_O_PROTOCOL) { |
| 4187 | error_setg(errp, "Block protocol '%s' doesn't support the option " |
| 4188 | "'%s'", drv->format_name, entry->key); |
| 4189 | } else { |
Max Reitz | d0e46a5 | 2016-03-16 19:54:34 +0100 | [diff] [blame] | 4190 | error_setg(errp, |
| 4191 | "Block format '%s' does not support the option '%s'", |
| 4192 | drv->format_name, entry->key); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 4193 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4194 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4195 | goto close_and_fail; |
| 4196 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4197 | |
Daniel P. Berrange | c01c214 | 2017-06-23 17:24:16 +0100 | [diff] [blame] | 4198 | bdrv_parent_cb_change_media(bs, true); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4199 | |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 4200 | qobject_unref(options); |
Alberto Garcia | 8961be3 | 2018-09-06 17:25:41 +0300 | [diff] [blame] | 4201 | options = NULL; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 4202 | |
| 4203 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
| 4204 | * temporary snapshot afterwards. */ |
| 4205 | if (snapshot_flags) { |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 4206 | BlockDriverState *snapshot_bs; |
| 4207 | snapshot_bs = bdrv_append_temp_snapshot(bs, snapshot_flags, |
| 4208 | snapshot_options, &local_err); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 4209 | snapshot_options = NULL; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 4210 | if (local_err) { |
| 4211 | goto close_and_fail; |
| 4212 | } |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4213 | /* We are not going to return bs but the overlay on top of it |
| 4214 | * (snapshot_bs); thus, we have to drop the strong reference to bs |
| 4215 | * (which we obtained by calling bdrv_new()). bs will not be deleted, |
| 4216 | * though, because the overlay still has a reference to it. */ |
| 4217 | bdrv_unref(bs); |
| 4218 | bs = snapshot_bs; |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 4219 | } |
| 4220 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4221 | return bs; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4222 | |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 4223 | fail: |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4224 | blk_unref(file); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 4225 | qobject_unref(snapshot_options); |
| 4226 | qobject_unref(bs->explicit_options); |
| 4227 | qobject_unref(bs->options); |
| 4228 | qobject_unref(options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 4229 | bs->options = NULL; |
Manos Pitsidianakis | 998cbd6 | 2017-07-14 17:35:47 +0300 | [diff] [blame] | 4230 | bs->explicit_options = NULL; |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4231 | bdrv_unref(bs); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 4232 | error_propagate(errp, local_err); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4233 | return NULL; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 4234 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4235 | close_and_fail: |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4236 | bdrv_unref(bs); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 4237 | qobject_unref(snapshot_options); |
| 4238 | qobject_unref(options); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 4239 | error_propagate(errp, local_err); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4240 | return NULL; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4241 | } |
| 4242 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4243 | BlockDriverState *bdrv_open(const char *filename, const char *reference, |
| 4244 | QDict *options, int flags, Error **errp) |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 4245 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4246 | GLOBAL_STATE_CODE(); |
| 4247 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4248 | return bdrv_open_inherit(filename, reference, options, flags, NULL, |
Kevin Wolf | 7ead946 | 2024-04-25 14:56:02 +0200 | [diff] [blame] | 4249 | NULL, 0, true, errp); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 4250 | } |
| 4251 | |
Alberto Garcia | faf116b | 2019-03-12 18:48:49 +0200 | [diff] [blame] | 4252 | /* Return true if the NULL-terminated @list contains @str */ |
| 4253 | static bool is_str_in_list(const char *str, const char *const *list) |
| 4254 | { |
| 4255 | if (str && list) { |
| 4256 | int i; |
| 4257 | for (i = 0; list[i] != NULL; i++) { |
| 4258 | if (!strcmp(str, list[i])) { |
| 4259 | return true; |
| 4260 | } |
| 4261 | } |
| 4262 | } |
| 4263 | return false; |
| 4264 | } |
| 4265 | |
| 4266 | /* |
| 4267 | * Check that every option set in @bs->options is also set in |
| 4268 | * @new_opts. |
| 4269 | * |
| 4270 | * Options listed in the common_options list and in |
| 4271 | * @bs->drv->mutable_opts are skipped. |
| 4272 | * |
| 4273 | * Return 0 on success, otherwise return -EINVAL and set @errp. |
| 4274 | */ |
| 4275 | static int bdrv_reset_options_allowed(BlockDriverState *bs, |
| 4276 | const QDict *new_opts, Error **errp) |
| 4277 | { |
| 4278 | const QDictEntry *e; |
| 4279 | /* These options are common to all block drivers and are handled |
| 4280 | * in bdrv_reopen_prepare() so they can be left out of @new_opts */ |
| 4281 | const char *const common_options[] = { |
| 4282 | "node-name", "discard", "cache.direct", "cache.no-flush", |
| 4283 | "read-only", "auto-read-only", "detect-zeroes", NULL |
| 4284 | }; |
| 4285 | |
| 4286 | for (e = qdict_first(bs->options); e; e = qdict_next(bs->options, e)) { |
| 4287 | if (!qdict_haskey(new_opts, e->key) && |
| 4288 | !is_str_in_list(e->key, common_options) && |
| 4289 | !is_str_in_list(e->key, bs->drv->mutable_opts)) { |
| 4290 | error_setg(errp, "Option '%s' cannot be reset " |
| 4291 | "to its default value", e->key); |
| 4292 | return -EINVAL; |
| 4293 | } |
| 4294 | } |
| 4295 | |
| 4296 | return 0; |
| 4297 | } |
| 4298 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4299 | /* |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4300 | * Returns true if @child can be reached recursively from @bs |
| 4301 | */ |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4302 | static bool GRAPH_RDLOCK |
| 4303 | bdrv_recurse_has_child(BlockDriverState *bs, BlockDriverState *child) |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4304 | { |
| 4305 | BdrvChild *c; |
| 4306 | |
| 4307 | if (bs == child) { |
| 4308 | return true; |
| 4309 | } |
| 4310 | |
| 4311 | QLIST_FOREACH(c, &bs->children, next) { |
| 4312 | if (bdrv_recurse_has_child(c->bs, child)) { |
| 4313 | return true; |
| 4314 | } |
| 4315 | } |
| 4316 | |
| 4317 | return false; |
| 4318 | } |
| 4319 | |
| 4320 | /* |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4321 | * Adds a BlockDriverState to a simple queue for an atomic, transactional |
| 4322 | * reopen of multiple devices. |
| 4323 | * |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4324 | * bs_queue can either be an existing BlockReopenQueue that has had QTAILQ_INIT |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4325 | * already performed, or alternatively may be NULL a new BlockReopenQueue will |
| 4326 | * be created and initialized. This newly created BlockReopenQueue should be |
| 4327 | * passed back in for subsequent calls that are intended to be of the same |
| 4328 | * atomic 'set'. |
| 4329 | * |
| 4330 | * bs is the BlockDriverState to add to the reopen queue. |
| 4331 | * |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4332 | * options contains the changed options for the associated bs |
| 4333 | * (the BlockReopenQueue takes ownership) |
| 4334 | * |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4335 | * flags contains the open flags for the associated bs |
| 4336 | * |
| 4337 | * returns a pointer to bs_queue, which is either the newly allocated |
| 4338 | * bs_queue, or the existing bs_queue being used. |
| 4339 | * |
Kevin Wolf | d22933a | 2022-11-18 18:41:02 +0100 | [diff] [blame] | 4340 | * bs is drained here and undrained by bdrv_reopen_queue_free(). |
Kevin Wolf | 2e11786 | 2022-11-18 18:41:01 +0100 | [diff] [blame] | 4341 | * |
| 4342 | * To be called with bs->aio_context locked. |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4343 | */ |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4344 | static BlockReopenQueue * GRAPH_RDLOCK |
| 4345 | bdrv_reopen_queue_child(BlockReopenQueue *bs_queue, BlockDriverState *bs, |
| 4346 | QDict *options, const BdrvChildClass *klass, |
| 4347 | BdrvChildRole role, bool parent_is_format, |
| 4348 | QDict *parent_options, int parent_flags, |
| 4349 | bool keep_old_opts) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4350 | { |
| 4351 | assert(bs != NULL); |
| 4352 | |
| 4353 | BlockReopenQueueEntry *bs_entry; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4354 | BdrvChild *child; |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4355 | QDict *old_options, *explicit_options, *options_copy; |
| 4356 | int flags; |
| 4357 | QemuOpts *opts; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4358 | |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 4359 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 4360 | |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4361 | /* |
| 4362 | * Strictly speaking, draining is illegal under GRAPH_RDLOCK. We know that |
| 4363 | * we've been called with bdrv_graph_rdlock_main_loop(), though, so it's ok |
| 4364 | * in practice. |
| 4365 | */ |
Kevin Wolf | d22933a | 2022-11-18 18:41:02 +0100 | [diff] [blame] | 4366 | bdrv_drained_begin(bs); |
| 4367 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4368 | if (bs_queue == NULL) { |
| 4369 | bs_queue = g_new0(BlockReopenQueue, 1); |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4370 | QTAILQ_INIT(bs_queue); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4371 | } |
| 4372 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4373 | if (!options) { |
| 4374 | options = qdict_new(); |
| 4375 | } |
| 4376 | |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 4377 | /* Check if this BlockDriverState is already in the queue */ |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4378 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 4379 | if (bs == bs_entry->state.bs) { |
| 4380 | break; |
| 4381 | } |
| 4382 | } |
| 4383 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4384 | /* |
| 4385 | * Precedence of options: |
| 4386 | * 1. Explicitly passed in options (highest) |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4387 | * 2. Retained from explicitly set options of bs |
| 4388 | * 3. Inherited from parent node |
| 4389 | * 4. Retained from effective options of bs |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4390 | */ |
| 4391 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 4392 | /* Old explicitly set values (don't overwrite by inherited value) */ |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 4393 | if (bs_entry || keep_old_opts) { |
| 4394 | old_options = qdict_clone_shallow(bs_entry ? |
| 4395 | bs_entry->state.explicit_options : |
| 4396 | bs->explicit_options); |
| 4397 | bdrv_join_options(bs, options, old_options); |
| 4398 | qobject_unref(old_options); |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 4399 | } |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 4400 | |
| 4401 | explicit_options = qdict_clone_shallow(options); |
| 4402 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4403 | /* Inherit from parent node */ |
| 4404 | if (parent_options) { |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4405 | flags = 0; |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4406 | klass->inherit_options(role, parent_is_format, &flags, options, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 4407 | parent_flags, parent_options); |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4408 | } else { |
| 4409 | flags = bdrv_get_flags(bs); |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4410 | } |
| 4411 | |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 4412 | if (keep_old_opts) { |
| 4413 | /* Old values are used for options that aren't set yet */ |
| 4414 | old_options = qdict_clone_shallow(bs->options); |
| 4415 | bdrv_join_options(bs, options, old_options); |
| 4416 | qobject_unref(old_options); |
| 4417 | } |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4418 | |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4419 | /* We have the final set of options so let's update the flags */ |
| 4420 | options_copy = qdict_clone_shallow(options); |
| 4421 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
| 4422 | qemu_opts_absorb_qdict(opts, options_copy, NULL); |
| 4423 | update_flags_from_options(&flags, opts); |
| 4424 | qemu_opts_del(opts); |
| 4425 | qobject_unref(options_copy); |
| 4426 | |
Kevin Wolf | fd45202 | 2017-08-03 17:02:59 +0200 | [diff] [blame] | 4427 | /* bdrv_open_inherit() sets and clears some additional flags internally */ |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 4428 | flags &= ~BDRV_O_PROTOCOL; |
Kevin Wolf | fd45202 | 2017-08-03 17:02:59 +0200 | [diff] [blame] | 4429 | if (flags & BDRV_O_RDWR) { |
| 4430 | flags |= BDRV_O_ALLOW_RDWR; |
| 4431 | } |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 4432 | |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 4433 | if (!bs_entry) { |
| 4434 | bs_entry = g_new0(BlockReopenQueueEntry, 1); |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4435 | QTAILQ_INSERT_TAIL(bs_queue, bs_entry, entry); |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 4436 | } else { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 4437 | qobject_unref(bs_entry->state.options); |
| 4438 | qobject_unref(bs_entry->state.explicit_options); |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 4439 | } |
| 4440 | |
| 4441 | bs_entry->state.bs = bs; |
| 4442 | bs_entry->state.options = options; |
| 4443 | bs_entry->state.explicit_options = explicit_options; |
| 4444 | bs_entry->state.flags = flags; |
| 4445 | |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4446 | /* |
| 4447 | * If keep_old_opts is false then it means that unspecified |
| 4448 | * options must be reset to their original value. We don't allow |
| 4449 | * resetting 'backing' but we need to know if the option is |
| 4450 | * missing in order to decide if we have to return an error. |
| 4451 | */ |
| 4452 | if (!keep_old_opts) { |
| 4453 | bs_entry->state.backing_missing = |
| 4454 | !qdict_haskey(options, "backing") && |
| 4455 | !qdict_haskey(options, "backing.driver"); |
| 4456 | } |
| 4457 | |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4458 | QLIST_FOREACH(child, &bs->children, next) { |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4459 | QDict *new_child_options = NULL; |
| 4460 | bool child_keep_old = keep_old_opts; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4461 | |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 4462 | /* reopen can only change the options of block devices that were |
| 4463 | * implicitly created and inherited options. For other (referenced) |
| 4464 | * block devices, a syntax like "backing.foo" results in an error. */ |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4465 | if (child->bs->inherits_from != bs) { |
| 4466 | continue; |
| 4467 | } |
| 4468 | |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4469 | /* Check if the options contain a child reference */ |
| 4470 | if (qdict_haskey(options, child->name)) { |
| 4471 | const char *childref = qdict_get_try_str(options, child->name); |
| 4472 | /* |
| 4473 | * The current child must not be reopened if the child |
| 4474 | * reference is null or points to a different node. |
| 4475 | */ |
| 4476 | if (g_strcmp0(childref, child->bs->node_name)) { |
| 4477 | continue; |
| 4478 | } |
| 4479 | /* |
| 4480 | * If the child reference points to the current child then |
| 4481 | * reopen it with its existing set of options (note that |
| 4482 | * it can still inherit new options from the parent). |
| 4483 | */ |
| 4484 | child_keep_old = true; |
| 4485 | } else { |
| 4486 | /* Extract child options ("child-name.*") */ |
| 4487 | char *child_key_dot = g_strdup_printf("%s.", child->name); |
| 4488 | qdict_extract_subqdict(explicit_options, NULL, child_key_dot); |
| 4489 | qdict_extract_subqdict(options, &new_child_options, child_key_dot); |
| 4490 | g_free(child_key_dot); |
| 4491 | } |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 4492 | |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4493 | bdrv_reopen_queue_child(bs_queue, child->bs, new_child_options, |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4494 | child->klass, child->role, bs->drv->is_format, |
| 4495 | options, flags, child_keep_old); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4496 | } |
| 4497 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4498 | return bs_queue; |
| 4499 | } |
| 4500 | |
Kevin Wolf | 2e11786 | 2022-11-18 18:41:01 +0100 | [diff] [blame] | 4501 | /* To be called with bs->aio_context locked */ |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4502 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
| 4503 | BlockDriverState *bs, |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 4504 | QDict *options, bool keep_old_opts) |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4505 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4506 | GLOBAL_STATE_CODE(); |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4507 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4508 | |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4509 | return bdrv_reopen_queue_child(bs_queue, bs, options, NULL, 0, false, |
| 4510 | NULL, 0, keep_old_opts); |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4511 | } |
| 4512 | |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 4513 | void bdrv_reopen_queue_free(BlockReopenQueue *bs_queue) |
| 4514 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4515 | GLOBAL_STATE_CODE(); |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 4516 | if (bs_queue) { |
| 4517 | BlockReopenQueueEntry *bs_entry, *next; |
| 4518 | QTAILQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
Kevin Wolf | d22933a | 2022-11-18 18:41:02 +0100 | [diff] [blame] | 4519 | bdrv_drained_end(bs_entry->state.bs); |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 4520 | qobject_unref(bs_entry->state.explicit_options); |
| 4521 | qobject_unref(bs_entry->state.options); |
| 4522 | g_free(bs_entry); |
| 4523 | } |
| 4524 | g_free(bs_queue); |
| 4525 | } |
| 4526 | } |
| 4527 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4528 | /* |
| 4529 | * Reopen multiple BlockDriverStates atomically & transactionally. |
| 4530 | * |
| 4531 | * The queue passed in (bs_queue) must have been built up previous |
| 4532 | * via bdrv_reopen_queue(). |
| 4533 | * |
| 4534 | * Reopens all BDS specified in the queue, with the appropriate |
| 4535 | * flags. All devices are prepared for reopen, and failure of any |
Stefan Weil | 50d6a8a | 2018-07-12 21:51:20 +0200 | [diff] [blame] | 4536 | * device will cause all device changes to be abandoned, and intermediate |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4537 | * data cleaned up. |
| 4538 | * |
| 4539 | * If all devices prepare successfully, then the changes are committed |
| 4540 | * to all devices. |
| 4541 | * |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 4542 | * All affected nodes must be drained between bdrv_reopen_queue() and |
| 4543 | * bdrv_reopen_multiple(). |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4544 | * |
| 4545 | * To be called from the main thread, with all other AioContexts unlocked. |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4546 | */ |
Alberto Garcia | 5019aec | 2019-03-12 18:48:50 +0200 | [diff] [blame] | 4547 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4548 | { |
| 4549 | int ret = -1; |
| 4550 | BlockReopenQueueEntry *bs_entry, *next; |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4551 | Transaction *tran = tran_new(); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4552 | g_autoptr(GSList) refresh_list = NULL; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4553 | |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4554 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4555 | assert(bs_queue != NULL); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 4556 | GLOBAL_STATE_CODE(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4557 | |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4558 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
Vladimir Sementsov-Ogievskiy | a2aabf8 | 2021-04-28 18:17:57 +0300 | [diff] [blame] | 4559 | ret = bdrv_flush(bs_entry->state.bs); |
| 4560 | if (ret < 0) { |
| 4561 | error_setg_errno(errp, -ret, "Error flushing drive"); |
Kevin Wolf | e3fc91a | 2021-05-03 13:05:55 +0200 | [diff] [blame] | 4562 | goto abort; |
Vladimir Sementsov-Ogievskiy | a2aabf8 | 2021-04-28 18:17:57 +0300 | [diff] [blame] | 4563 | } |
| 4564 | } |
| 4565 | |
| 4566 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 4567 | assert(bs_entry->state.bs->quiesce_counter > 0); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4568 | ret = bdrv_reopen_prepare(&bs_entry->state, bs_queue, tran, errp); |
| 4569 | if (ret < 0) { |
| 4570 | goto abort; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4571 | } |
| 4572 | bs_entry->prepared = true; |
| 4573 | } |
| 4574 | |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4575 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4576 | BDRVReopenState *state = &bs_entry->state; |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4577 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 4578 | refresh_list = g_slist_prepend(refresh_list, state->bs); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4579 | if (state->old_backing_bs) { |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 4580 | refresh_list = g_slist_prepend(refresh_list, state->old_backing_bs); |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4581 | } |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4582 | if (state->old_file_bs) { |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 4583 | refresh_list = g_slist_prepend(refresh_list, state->old_file_bs); |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4584 | } |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4585 | } |
| 4586 | |
| 4587 | /* |
| 4588 | * Note that file-posix driver rely on permission update done during reopen |
| 4589 | * (even if no permission changed), because it wants "new" permissions for |
| 4590 | * reconfiguring the fd and that's why it does it in raw_check_perm(), not |
| 4591 | * in raw_reopen_prepare() which is called with "old" permissions. |
| 4592 | */ |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 4593 | bdrv_graph_rdlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4594 | ret = bdrv_list_refresh_perms(refresh_list, bs_queue, tran, errp); |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 4595 | bdrv_graph_rdunlock_main_loop(); |
| 4596 | |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4597 | if (ret < 0) { |
| 4598 | goto abort; |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4599 | } |
| 4600 | |
Vladimir Sementsov-Ogievskiy | fcd6a4f | 2019-09-27 15:23:48 +0300 | [diff] [blame] | 4601 | /* |
| 4602 | * If we reach this point, we have success and just need to apply the |
| 4603 | * changes. |
| 4604 | * |
| 4605 | * Reverse order is used to comfort qcow2 driver: on commit it need to write |
| 4606 | * IN_USE flag to the image, to mark bitmaps in the image as invalid. But |
| 4607 | * children are usually goes after parents in reopen-queue, so go from last |
| 4608 | * to first element. |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4609 | */ |
Vladimir Sementsov-Ogievskiy | fcd6a4f | 2019-09-27 15:23:48 +0300 | [diff] [blame] | 4610 | QTAILQ_FOREACH_REVERSE(bs_entry, bs_queue, entry) { |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4611 | bdrv_reopen_commit(&bs_entry->state); |
| 4612 | } |
| 4613 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 4614 | bdrv_graph_wrlock(); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4615 | tran_commit(tran); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 4616 | bdrv_graph_wrunlock(); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4617 | |
| 4618 | QTAILQ_FOREACH_REVERSE(bs_entry, bs_queue, entry) { |
| 4619 | BlockDriverState *bs = bs_entry->state.bs; |
| 4620 | |
| 4621 | if (bs->drv->bdrv_reopen_commit_post) { |
| 4622 | bs->drv->bdrv_reopen_commit_post(&bs_entry->state); |
| 4623 | } |
| 4624 | } |
| 4625 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4626 | ret = 0; |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4627 | goto cleanup; |
| 4628 | |
| 4629 | abort: |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 4630 | bdrv_graph_wrlock(); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4631 | tran_abort(tran); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 4632 | bdrv_graph_wrunlock(); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 4633 | |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4634 | QTAILQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4635 | if (bs_entry->prepared) { |
| 4636 | bdrv_reopen_abort(&bs_entry->state); |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4637 | } |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4638 | } |
Peter Krempa | 17e1e2b | 2020-02-28 13:44:46 +0100 | [diff] [blame] | 4639 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4640 | cleanup: |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 4641 | bdrv_reopen_queue_free(bs_queue); |
Alberto Garcia | 40840e4 | 2016-10-28 10:08:03 +0300 | [diff] [blame] | 4642 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4643 | return ret; |
| 4644 | } |
| 4645 | |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4646 | int bdrv_reopen(BlockDriverState *bs, QDict *opts, bool keep_old_opts, |
| 4647 | Error **errp) |
| 4648 | { |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4649 | BlockReopenQueue *queue; |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4650 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4651 | GLOBAL_STATE_CODE(); |
| 4652 | |
Kevin Wolf | 2e11786 | 2022-11-18 18:41:01 +0100 | [diff] [blame] | 4653 | queue = bdrv_reopen_queue(NULL, bs, opts, keep_old_opts); |
| 4654 | |
Stefan Hajnoczi | b49f475 | 2023-12-05 13:20:03 -0500 | [diff] [blame] | 4655 | return bdrv_reopen_multiple(queue, errp); |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4656 | } |
| 4657 | |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 4658 | int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only, |
| 4659 | Error **errp) |
| 4660 | { |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 4661 | QDict *opts = qdict_new(); |
| 4662 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4663 | GLOBAL_STATE_CODE(); |
| 4664 | |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 4665 | qdict_put_bool(opts, BDRV_OPT_READ_ONLY, read_only); |
| 4666 | |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4667 | return bdrv_reopen(bs, opts, true, errp); |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 4668 | } |
| 4669 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4670 | /* |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4671 | * Take a BDRVReopenState and check if the value of 'backing' in the |
| 4672 | * reopen_state->options QDict is valid or not. |
| 4673 | * |
| 4674 | * If 'backing' is missing from the QDict then return 0. |
| 4675 | * |
| 4676 | * If 'backing' contains the node name of the backing file of |
| 4677 | * reopen_state->bs then return 0. |
| 4678 | * |
| 4679 | * If 'backing' contains a different node name (or is null) then check |
| 4680 | * whether the current backing file can be replaced with the new one. |
| 4681 | * If that's the case then reopen_state->replace_backing_bs is set to |
| 4682 | * true and reopen_state->new_backing_bs contains a pointer to the new |
| 4683 | * backing BlockDriverState (or NULL). |
| 4684 | * |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 4685 | * After calling this function, the transaction @tran may only be completed |
| 4686 | * while holding a writer lock for the graph. |
| 4687 | * |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4688 | * Return 0 on success, otherwise return < 0 and set @errp. |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4689 | * |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4690 | * @reopen_state->bs can move to a different AioContext in this function. |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4691 | */ |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4692 | static int GRAPH_UNLOCKED |
| 4693 | bdrv_reopen_parse_file_or_backing(BDRVReopenState *reopen_state, |
| 4694 | bool is_backing, Transaction *tran, |
| 4695 | Error **errp) |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4696 | { |
| 4697 | BlockDriverState *bs = reopen_state->bs; |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4698 | BlockDriverState *new_child_bs; |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 4699 | BlockDriverState *old_child_bs; |
| 4700 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4701 | const char *child_name = is_backing ? "backing" : "file"; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4702 | QObject *value; |
| 4703 | const char *str; |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4704 | bool has_child; |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4705 | int ret; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4706 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 4707 | GLOBAL_STATE_CODE(); |
| 4708 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4709 | value = qdict_get(reopen_state->options, child_name); |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4710 | if (value == NULL) { |
| 4711 | return 0; |
| 4712 | } |
| 4713 | |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4714 | bdrv_graph_rdlock_main_loop(); |
| 4715 | |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4716 | switch (qobject_type(value)) { |
| 4717 | case QTYPE_QNULL: |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4718 | assert(is_backing); /* The 'file' option does not allow a null value */ |
| 4719 | new_child_bs = NULL; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4720 | break; |
| 4721 | case QTYPE_QSTRING: |
Markus Armbruster | 410f44f | 2020-12-11 18:11:42 +0100 | [diff] [blame] | 4722 | str = qstring_get_str(qobject_to(QString, value)); |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4723 | new_child_bs = bdrv_lookup_bs(NULL, str, errp); |
| 4724 | if (new_child_bs == NULL) { |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4725 | ret = -EINVAL; |
| 4726 | goto out_rdlock; |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4727 | } |
| 4728 | |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4729 | has_child = bdrv_recurse_has_child(new_child_bs, bs); |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4730 | if (has_child) { |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4731 | error_setg(errp, "Making '%s' a %s child of '%s' would create a " |
| 4732 | "cycle", str, child_name, bs->node_name); |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4733 | ret = -EINVAL; |
| 4734 | goto out_rdlock; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4735 | } |
| 4736 | break; |
| 4737 | default: |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4738 | /* |
| 4739 | * The options QDict has been flattened, so 'backing' and 'file' |
| 4740 | * do not allow any other data type here. |
| 4741 | */ |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4742 | g_assert_not_reached(); |
| 4743 | } |
| 4744 | |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 4745 | old_child_bs = is_backing ? child_bs(bs->backing) : child_bs(bs->file); |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4746 | if (old_child_bs == new_child_bs) { |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4747 | ret = 0; |
| 4748 | goto out_rdlock; |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4749 | } |
| 4750 | |
| 4751 | if (old_child_bs) { |
| 4752 | if (bdrv_skip_implicit_filters(old_child_bs) == new_child_bs) { |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4753 | ret = 0; |
| 4754 | goto out_rdlock; |
Vladimir Sementsov-Ogievskiy | cbfdb98 | 2021-06-10 15:05:33 +0300 | [diff] [blame] | 4755 | } |
| 4756 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4757 | if (old_child_bs->implicit) { |
| 4758 | error_setg(errp, "Cannot replace implicit %s child of %s", |
| 4759 | child_name, bs->node_name); |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4760 | ret = -EPERM; |
| 4761 | goto out_rdlock; |
Vladimir Sementsov-Ogievskiy | cbfdb98 | 2021-06-10 15:05:33 +0300 | [diff] [blame] | 4762 | } |
| 4763 | } |
| 4764 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4765 | if (bs->drv->is_filter && !old_child_bs) { |
Vladimir Sementsov-Ogievskiy | 25f78d9 | 2021-06-10 15:05:34 +0300 | [diff] [blame] | 4766 | /* |
| 4767 | * Filters always have a file or a backing child, so we are trying to |
| 4768 | * change wrong child |
| 4769 | */ |
| 4770 | error_setg(errp, "'%s' is a %s filter node that does not support a " |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4771 | "%s child", bs->node_name, bs->drv->format_name, child_name); |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4772 | ret = -EINVAL; |
| 4773 | goto out_rdlock; |
Max Reitz | 1d42f48 | 2019-06-12 17:24:39 +0200 | [diff] [blame] | 4774 | } |
| 4775 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4776 | if (is_backing) { |
| 4777 | reopen_state->old_backing_bs = old_child_bs; |
| 4778 | } else { |
| 4779 | reopen_state->old_file_bs = old_child_bs; |
| 4780 | } |
| 4781 | |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 4782 | if (old_child_bs) { |
| 4783 | bdrv_ref(old_child_bs); |
| 4784 | bdrv_drained_begin(old_child_bs); |
| 4785 | } |
| 4786 | |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4787 | bdrv_graph_rdunlock_main_loop(); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 4788 | bdrv_graph_wrlock(); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 4789 | |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4790 | ret = bdrv_set_file_or_backing_noperm(bs, new_child_bs, is_backing, |
| 4791 | tran, errp); |
| 4792 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 4793 | bdrv_graph_wrunlock(); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 4794 | |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 4795 | if (old_child_bs) { |
| 4796 | bdrv_drained_end(old_child_bs); |
| 4797 | bdrv_unref(old_child_bs); |
| 4798 | } |
| 4799 | |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4800 | return ret; |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4801 | |
| 4802 | out_rdlock: |
| 4803 | bdrv_graph_rdunlock_main_loop(); |
| 4804 | return ret; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4805 | } |
| 4806 | |
| 4807 | /* |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4808 | * Prepares a BlockDriverState for reopen. All changes are staged in the |
| 4809 | * 'opaque' field of the BDRVReopenState, which is used and allocated by |
| 4810 | * the block driver layer .bdrv_reopen_prepare() |
| 4811 | * |
| 4812 | * bs is the BlockDriverState to reopen |
| 4813 | * flags are the new open flags |
| 4814 | * queue is the reopen queue |
| 4815 | * |
| 4816 | * Returns 0 on success, non-zero on error. On error errp will be set |
| 4817 | * as well. |
| 4818 | * |
| 4819 | * On failure, bdrv_reopen_abort() will be called to clean up any data. |
| 4820 | * It is the responsibility of the caller to then call the abort() or |
| 4821 | * commit() for any other BDS that have been left in a prepare() state |
| 4822 | * |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 4823 | * After calling this function, the transaction @change_child_tran may only be |
| 4824 | * completed while holding a writer lock for the graph. |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4825 | */ |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4826 | static int GRAPH_UNLOCKED |
| 4827 | bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, |
| 4828 | Transaction *change_child_tran, Error **errp) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4829 | { |
| 4830 | int ret = -1; |
Alberto Garcia | e6d79c4 | 2018-11-12 16:00:47 +0200 | [diff] [blame] | 4831 | int old_flags; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4832 | Error *local_err = NULL; |
| 4833 | BlockDriver *drv; |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4834 | QemuOpts *opts; |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 4835 | QDict *orig_reopen_opts; |
Alberto Garcia | 593b307 | 2018-09-06 12:37:08 +0300 | [diff] [blame] | 4836 | char *discard = NULL; |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 4837 | bool read_only; |
Max Reitz | 9ad08c4 | 2018-11-16 17:45:24 +0100 | [diff] [blame] | 4838 | bool drv_prepared = false; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4839 | |
| 4840 | assert(reopen_state != NULL); |
| 4841 | assert(reopen_state->bs->drv != NULL); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 4842 | GLOBAL_STATE_CODE(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4843 | drv = reopen_state->bs->drv; |
| 4844 | |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 4845 | /* This function and each driver's bdrv_reopen_prepare() remove |
| 4846 | * entries from reopen_state->options as they are processed, so |
| 4847 | * we need to make a copy of the original QDict. */ |
| 4848 | orig_reopen_opts = qdict_clone_shallow(reopen_state->options); |
| 4849 | |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4850 | /* Process generic block layer options */ |
| 4851 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
Markus Armbruster | af175e8 | 2020-07-07 18:06:03 +0200 | [diff] [blame] | 4852 | if (!qemu_opts_absorb_qdict(opts, reopen_state->options, errp)) { |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4853 | ret = -EINVAL; |
| 4854 | goto error; |
| 4855 | } |
| 4856 | |
Alberto Garcia | e6d79c4 | 2018-11-12 16:00:47 +0200 | [diff] [blame] | 4857 | /* This was already called in bdrv_reopen_queue_child() so the flags |
| 4858 | * are up-to-date. This time we simply want to remove the options from |
| 4859 | * QemuOpts in order to indicate that they have been processed. */ |
| 4860 | old_flags = reopen_state->flags; |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 4861 | update_flags_from_options(&reopen_state->flags, opts); |
Alberto Garcia | e6d79c4 | 2018-11-12 16:00:47 +0200 | [diff] [blame] | 4862 | assert(old_flags == reopen_state->flags); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 4863 | |
Alberto Garcia | 415bbca | 2018-10-03 13:23:13 +0300 | [diff] [blame] | 4864 | discard = qemu_opt_get_del(opts, BDRV_OPT_DISCARD); |
Alberto Garcia | 593b307 | 2018-09-06 12:37:08 +0300 | [diff] [blame] | 4865 | if (discard != NULL) { |
| 4866 | if (bdrv_parse_discard_flags(discard, &reopen_state->flags) != 0) { |
| 4867 | error_setg(errp, "Invalid discard option"); |
| 4868 | ret = -EINVAL; |
| 4869 | goto error; |
| 4870 | } |
| 4871 | } |
| 4872 | |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 4873 | reopen_state->detect_zeroes = |
| 4874 | bdrv_parse_detect_zeroes(opts, reopen_state->flags, &local_err); |
| 4875 | if (local_err) { |
| 4876 | error_propagate(errp, local_err); |
| 4877 | ret = -EINVAL; |
| 4878 | goto error; |
| 4879 | } |
| 4880 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 4881 | /* All other options (including node-name and driver) must be unchanged. |
| 4882 | * Put them back into the QDict, so that they are checked at the end |
| 4883 | * of this function. */ |
| 4884 | qemu_opts_to_qdict(opts, reopen_state->options); |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4885 | |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 4886 | /* If we are to stay read-only, do not allow permission change |
| 4887 | * to r/w. Attempting to set to r/w may fail if either BDRV_O_ALLOW_RDWR is |
| 4888 | * not set, or if the BDS still has copy_on_read enabled */ |
| 4889 | read_only = !(reopen_state->flags & BDRV_O_RDWR); |
Kevin Wolf | 4026f1c | 2023-09-29 16:51:47 +0200 | [diff] [blame] | 4890 | |
| 4891 | bdrv_graph_rdlock_main_loop(); |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 4892 | ret = bdrv_can_set_read_only(reopen_state->bs, read_only, true, &local_err); |
Kevin Wolf | 4026f1c | 2023-09-29 16:51:47 +0200 | [diff] [blame] | 4893 | bdrv_graph_rdunlock_main_loop(); |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 4894 | if (local_err) { |
| 4895 | error_propagate(errp, local_err); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4896 | goto error; |
| 4897 | } |
| 4898 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4899 | if (drv->bdrv_reopen_prepare) { |
Alberto Garcia | faf116b | 2019-03-12 18:48:49 +0200 | [diff] [blame] | 4900 | /* |
| 4901 | * If a driver-specific option is missing, it means that we |
| 4902 | * should reset it to its default value. |
| 4903 | * But not all options allow that, so we need to check it first. |
| 4904 | */ |
| 4905 | ret = bdrv_reset_options_allowed(reopen_state->bs, |
| 4906 | reopen_state->options, errp); |
| 4907 | if (ret) { |
| 4908 | goto error; |
| 4909 | } |
| 4910 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4911 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); |
| 4912 | if (ret) { |
| 4913 | if (local_err != NULL) { |
| 4914 | error_propagate(errp, local_err); |
| 4915 | } else { |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 4916 | bdrv_graph_rdlock_main_loop(); |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 4917 | bdrv_refresh_filename(reopen_state->bs); |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 4918 | bdrv_graph_rdunlock_main_loop(); |
Luiz Capitulino | d8b6895 | 2013-06-10 11:29:27 -0400 | [diff] [blame] | 4919 | error_setg(errp, "failed while preparing to reopen image '%s'", |
| 4920 | reopen_state->bs->filename); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4921 | } |
| 4922 | goto error; |
| 4923 | } |
| 4924 | } else { |
| 4925 | /* It is currently mandatory to have a bdrv_reopen_prepare() |
| 4926 | * handler for each supported drv. */ |
Kevin Wolf | 4026f1c | 2023-09-29 16:51:47 +0200 | [diff] [blame] | 4927 | bdrv_graph_rdlock_main_loop(); |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 4928 | error_setg(errp, "Block format '%s' used by node '%s' " |
| 4929 | "does not support reopening files", drv->format_name, |
| 4930 | bdrv_get_device_or_node_name(reopen_state->bs)); |
Kevin Wolf | 4026f1c | 2023-09-29 16:51:47 +0200 | [diff] [blame] | 4931 | bdrv_graph_rdunlock_main_loop(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4932 | ret = -1; |
| 4933 | goto error; |
| 4934 | } |
| 4935 | |
Max Reitz | 9ad08c4 | 2018-11-16 17:45:24 +0100 | [diff] [blame] | 4936 | drv_prepared = true; |
| 4937 | |
Alberto Garcia | bacd9b8 | 2019-03-12 18:48:46 +0200 | [diff] [blame] | 4938 | /* |
| 4939 | * We must provide the 'backing' option if the BDS has a backing |
| 4940 | * file or if the image file has a backing file name as part of |
| 4941 | * its metadata. Otherwise the 'backing' option can be omitted. |
| 4942 | */ |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 4943 | bdrv_graph_rdlock_main_loop(); |
Alberto Garcia | bacd9b8 | 2019-03-12 18:48:46 +0200 | [diff] [blame] | 4944 | if (drv->supports_backing && reopen_state->backing_missing && |
Max Reitz | 1d42f48 | 2019-06-12 17:24:39 +0200 | [diff] [blame] | 4945 | (reopen_state->bs->backing || reopen_state->bs->backing_file[0])) { |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4946 | error_setg(errp, "backing is missing for '%s'", |
| 4947 | reopen_state->bs->node_name); |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 4948 | bdrv_graph_rdunlock_main_loop(); |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4949 | ret = -EINVAL; |
| 4950 | goto error; |
| 4951 | } |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 4952 | bdrv_graph_rdunlock_main_loop(); |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4953 | |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4954 | /* |
| 4955 | * Allow changing the 'backing' option. The new value can be |
| 4956 | * either a reference to an existing node (using its node name) |
| 4957 | * or NULL to simply detach the current backing file. |
| 4958 | */ |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4959 | ret = bdrv_reopen_parse_file_or_backing(reopen_state, true, |
| 4960 | change_child_tran, errp); |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4961 | if (ret < 0) { |
| 4962 | goto error; |
| 4963 | } |
| 4964 | qdict_del(reopen_state->options, "backing"); |
| 4965 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4966 | /* Allow changing the 'file' option. In this case NULL is not allowed */ |
| 4967 | ret = bdrv_reopen_parse_file_or_backing(reopen_state, false, |
| 4968 | change_child_tran, errp); |
| 4969 | if (ret < 0) { |
| 4970 | goto error; |
| 4971 | } |
| 4972 | qdict_del(reopen_state->options, "file"); |
| 4973 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4974 | /* Options that are not handled are only okay if they are unchanged |
| 4975 | * compared to the old state. It is expected that some options are only |
| 4976 | * used for the initial open, but not reopen (e.g. filename) */ |
| 4977 | if (qdict_size(reopen_state->options)) { |
| 4978 | const QDictEntry *entry = qdict_first(reopen_state->options); |
| 4979 | |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4980 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 4981 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4982 | do { |
Max Reitz | 54fd1b0 | 2017-11-14 19:01:26 +0100 | [diff] [blame] | 4983 | QObject *new = entry->value; |
| 4984 | QObject *old = qdict_get(reopen_state->bs->options, entry->key); |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4985 | |
Alberto Garcia | db90528 | 2018-09-06 12:37:05 +0300 | [diff] [blame] | 4986 | /* Allow child references (child_name=node_name) as long as they |
| 4987 | * point to the current child (i.e. everything stays the same). */ |
| 4988 | if (qobject_type(new) == QTYPE_QSTRING) { |
| 4989 | BdrvChild *child; |
| 4990 | QLIST_FOREACH(child, &reopen_state->bs->children, next) { |
| 4991 | if (!strcmp(child->name, entry->key)) { |
| 4992 | break; |
| 4993 | } |
| 4994 | } |
| 4995 | |
| 4996 | if (child) { |
Markus Armbruster | 410f44f | 2020-12-11 18:11:42 +0100 | [diff] [blame] | 4997 | if (!strcmp(child->bs->node_name, |
| 4998 | qstring_get_str(qobject_to(QString, new)))) { |
Alberto Garcia | db90528 | 2018-09-06 12:37:05 +0300 | [diff] [blame] | 4999 | continue; /* Found child with this name, skip option */ |
| 5000 | } |
| 5001 | } |
| 5002 | } |
| 5003 | |
Max Reitz | 54fd1b0 | 2017-11-14 19:01:26 +0100 | [diff] [blame] | 5004 | /* |
| 5005 | * TODO: When using -drive to specify blockdev options, all values |
| 5006 | * will be strings; however, when using -blockdev, blockdev-add or |
| 5007 | * filenames using the json:{} pseudo-protocol, they will be |
| 5008 | * correctly typed. |
| 5009 | * In contrast, reopening options are (currently) always strings |
| 5010 | * (because you can only specify them through qemu-io; all other |
| 5011 | * callers do not specify any options). |
| 5012 | * Therefore, when using anything other than -drive to create a BDS, |
| 5013 | * this cannot detect non-string options as unchanged, because |
| 5014 | * qobject_is_equal() always returns false for objects of different |
| 5015 | * type. In the future, this should be remedied by correctly typing |
| 5016 | * all options. For now, this is not too big of an issue because |
| 5017 | * the user can simply omit options which cannot be changed anyway, |
| 5018 | * so they will stay unchanged. |
| 5019 | */ |
| 5020 | if (!qobject_is_equal(new, old)) { |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 5021 | error_setg(errp, "Cannot change the option '%s'", entry->key); |
| 5022 | ret = -EINVAL; |
| 5023 | goto error; |
| 5024 | } |
| 5025 | } while ((entry = qdict_next(reopen_state->options, entry))); |
| 5026 | } |
| 5027 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5028 | ret = 0; |
| 5029 | |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 5030 | /* Restore the original reopen_state->options QDict */ |
| 5031 | qobject_unref(reopen_state->options); |
| 5032 | reopen_state->options = qobject_ref(orig_reopen_opts); |
| 5033 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5034 | error: |
Max Reitz | 9ad08c4 | 2018-11-16 17:45:24 +0100 | [diff] [blame] | 5035 | if (ret < 0 && drv_prepared) { |
| 5036 | /* drv->bdrv_reopen_prepare() has succeeded, so we need to |
| 5037 | * call drv->bdrv_reopen_abort() before signaling an error |
| 5038 | * (bdrv_reopen_multiple() will not call bdrv_reopen_abort() |
| 5039 | * when the respective bdrv_reopen_prepare() has failed) */ |
| 5040 | if (drv->bdrv_reopen_abort) { |
| 5041 | drv->bdrv_reopen_abort(reopen_state); |
| 5042 | } |
| 5043 | } |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 5044 | qemu_opts_del(opts); |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 5045 | qobject_unref(orig_reopen_opts); |
Alberto Garcia | 593b307 | 2018-09-06 12:37:08 +0300 | [diff] [blame] | 5046 | g_free(discard); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5047 | return ret; |
| 5048 | } |
| 5049 | |
| 5050 | /* |
| 5051 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and |
| 5052 | * makes them final by swapping the staging BlockDriverState contents into |
| 5053 | * the active BlockDriverState contents. |
| 5054 | */ |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 5055 | static void GRAPH_UNLOCKED bdrv_reopen_commit(BDRVReopenState *reopen_state) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5056 | { |
| 5057 | BlockDriver *drv; |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 5058 | BlockDriverState *bs; |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 5059 | BdrvChild *child; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5060 | |
| 5061 | assert(reopen_state != NULL); |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 5062 | bs = reopen_state->bs; |
| 5063 | drv = bs->drv; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5064 | assert(drv != NULL); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 5065 | GLOBAL_STATE_CODE(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5066 | |
| 5067 | /* If there are any driver level actions to take */ |
| 5068 | if (drv->bdrv_reopen_commit) { |
| 5069 | drv->bdrv_reopen_commit(reopen_state); |
| 5070 | } |
| 5071 | |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 5072 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 5073 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5074 | /* set BDS specific flags now */ |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5075 | qobject_unref(bs->explicit_options); |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 5076 | qobject_unref(bs->options); |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 5077 | qobject_ref(reopen_state->explicit_options); |
| 5078 | qobject_ref(reopen_state->options); |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 5079 | |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 5080 | bs->explicit_options = reopen_state->explicit_options; |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 5081 | bs->options = reopen_state->options; |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 5082 | bs->open_flags = reopen_state->flags; |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 5083 | bs->detect_zeroes = reopen_state->detect_zeroes; |
Kevin Wolf | 355ef4a | 2013-12-11 20:14:09 +0100 | [diff] [blame] | 5084 | |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 5085 | /* Remove child references from bs->options and bs->explicit_options. |
| 5086 | * Child options were already removed in bdrv_reopen_queue_child() */ |
| 5087 | QLIST_FOREACH(child, &bs->children, next) { |
| 5088 | qdict_del(bs->explicit_options, child->name); |
| 5089 | qdict_del(bs->options, child->name); |
| 5090 | } |
Vladimir Sementsov-Ogievskiy | 3d0e874 | 2021-06-10 15:05:35 +0300 | [diff] [blame] | 5091 | /* backing is probably removed, so it's not handled by previous loop */ |
| 5092 | qdict_del(bs->explicit_options, "backing"); |
| 5093 | qdict_del(bs->options, "backing"); |
| 5094 | |
Vladimir Sementsov-Ogievskiy | 1e4c797 | 2021-04-28 18:17:55 +0300 | [diff] [blame] | 5095 | bdrv_refresh_limits(bs, NULL, NULL); |
Paolo Bonzini | 439cc33 | 2023-04-07 17:32:58 +0200 | [diff] [blame] | 5096 | bdrv_refresh_total_sectors(bs, bs->total_sectors); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5097 | } |
| 5098 | |
| 5099 | /* |
| 5100 | * Abort the reopen, and delete and free the staged changes in |
| 5101 | * reopen_state |
| 5102 | */ |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 5103 | static void GRAPH_UNLOCKED bdrv_reopen_abort(BDRVReopenState *reopen_state) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5104 | { |
| 5105 | BlockDriver *drv; |
| 5106 | |
| 5107 | assert(reopen_state != NULL); |
| 5108 | drv = reopen_state->bs->drv; |
| 5109 | assert(drv != NULL); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 5110 | GLOBAL_STATE_CODE(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5111 | |
| 5112 | if (drv->bdrv_reopen_abort) { |
| 5113 | drv->bdrv_reopen_abort(reopen_state); |
| 5114 | } |
| 5115 | } |
| 5116 | |
| 5117 | |
Max Reitz | 64dff52 | 2016-01-29 16:36:10 +0100 | [diff] [blame] | 5118 | static void bdrv_close(BlockDriverState *bs) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 5119 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5120 | BdrvAioNotifier *ban, *ban_next; |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5121 | BdrvChild *child, *next; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5122 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5123 | GLOBAL_STATE_CODE(); |
Max Reitz | 30f55fb | 2016-05-17 16:41:32 +0200 | [diff] [blame] | 5124 | assert(!bs->refcnt); |
Alberto Garcia | 99b7e77 | 2015-09-25 16:41:44 +0300 | [diff] [blame] | 5125 | |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 5126 | bdrv_drained_begin(bs); /* complete I/O */ |
Stefan Hajnoczi | 58fda17 | 2013-07-02 15:36:25 +0200 | [diff] [blame] | 5127 | bdrv_flush(bs); |
Fam Zheng | 53ec73e | 2015-05-29 18:53:14 +0800 | [diff] [blame] | 5128 | bdrv_drain(bs); /* in case flush left pending I/O */ |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 5129 | |
Paolo Bonzini | 3cbc002 | 2012-10-19 11:36:48 +0200 | [diff] [blame] | 5130 | if (bs->drv) { |
Vladimir Sementsov-Ogievskiy | 3c00529 | 2018-08-14 15:43:19 +0300 | [diff] [blame] | 5131 | if (bs->drv->bdrv_close) { |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5132 | /* Must unfreeze all children, so bdrv_unref_child() works */ |
Vladimir Sementsov-Ogievskiy | 3c00529 | 2018-08-14 15:43:19 +0300 | [diff] [blame] | 5133 | bs->drv->bdrv_close(bs); |
| 5134 | } |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 5135 | bs->drv = NULL; |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 5136 | } |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 5137 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5138 | bdrv_graph_wrlock(); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5139 | QLIST_FOREACH_SAFE(child, &bs->children, next, next) { |
Alberto Garcia | dd4118c | 2019-05-13 16:46:17 +0300 | [diff] [blame] | 5140 | bdrv_unref_child(bs, child); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5141 | } |
| 5142 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 5143 | assert(!bs->backing); |
| 5144 | assert(!bs->file); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5145 | bdrv_graph_wrunlock(); |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 5146 | |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5147 | g_free(bs->opaque); |
| 5148 | bs->opaque = NULL; |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 5149 | qatomic_set(&bs->copy_on_read, 0); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5150 | bs->backing_file[0] = '\0'; |
| 5151 | bs->backing_format[0] = '\0'; |
| 5152 | bs->total_sectors = 0; |
| 5153 | bs->encrypted = false; |
| 5154 | bs->sg = false; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5155 | qobject_unref(bs->options); |
| 5156 | qobject_unref(bs->explicit_options); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5157 | bs->options = NULL; |
| 5158 | bs->explicit_options = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5159 | qobject_unref(bs->full_open_options); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5160 | bs->full_open_options = NULL; |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 5161 | g_free(bs->block_status_cache); |
| 5162 | bs->block_status_cache = NULL; |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5163 | |
Vladimir Sementsov-Ogievskiy | cca43ae | 2017-06-28 15:05:16 +0300 | [diff] [blame] | 5164 | bdrv_release_named_dirty_bitmaps(bs); |
| 5165 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
| 5166 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5167 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 5168 | g_free(ban); |
| 5169 | } |
| 5170 | QLIST_INIT(&bs->aio_notifiers); |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 5171 | bdrv_drained_end(bs); |
Greg Kurz | 1a6d3bd | 2020-10-23 17:01:10 +0200 | [diff] [blame] | 5172 | |
| 5173 | /* |
| 5174 | * If we're still inside some bdrv_drain_all_begin()/end() sections, end |
| 5175 | * them now since this BDS won't exist anymore when bdrv_drain_all_end() |
| 5176 | * gets called. |
| 5177 | */ |
| 5178 | if (bs->quiesce_counter) { |
| 5179 | bdrv_drain_all_end_quiesce(bs); |
| 5180 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 5181 | } |
| 5182 | |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 5183 | void bdrv_close_all(void) |
| 5184 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5185 | GLOBAL_STATE_CODE(); |
Emanuele Giuseppe Esposito | 880eeec | 2022-09-26 05:32:04 -0400 | [diff] [blame] | 5186 | assert(job_next(NULL) == NULL); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 5187 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 5188 | /* Drop references from requests still in flight, such as canceled block |
| 5189 | * jobs whose AIO context has not been polled yet */ |
| 5190 | bdrv_drain_all(); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 5191 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 5192 | blk_remove_all_bs(); |
| 5193 | blockdev_close_all_bdrv_states(); |
| 5194 | |
Kevin Wolf | a1a2af0 | 2016-04-08 18:26:37 +0200 | [diff] [blame] | 5195 | assert(QTAILQ_EMPTY(&all_bdrv_states)); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 5196 | } |
| 5197 | |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5198 | static bool GRAPH_RDLOCK should_update_child(BdrvChild *c, BlockDriverState *to) |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5199 | { |
Vladimir Sementsov-Ogievskiy | 2f30b7c | 2019-02-23 22:20:39 +0300 | [diff] [blame] | 5200 | GQueue *queue; |
| 5201 | GHashTable *found; |
| 5202 | bool ret; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5203 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 5204 | if (c->klass->stay_at_node) { |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 5205 | return false; |
| 5206 | } |
| 5207 | |
Max Reitz | ec9f10f | 2018-06-13 20:18:15 +0200 | [diff] [blame] | 5208 | /* If the child @c belongs to the BDS @to, replacing the current |
| 5209 | * c->bs by @to would mean to create a loop. |
| 5210 | * |
| 5211 | * Such a case occurs when appending a BDS to a backing chain. |
| 5212 | * For instance, imagine the following chain: |
| 5213 | * |
| 5214 | * guest device -> node A -> further backing chain... |
| 5215 | * |
| 5216 | * Now we create a new BDS B which we want to put on top of this |
| 5217 | * chain, so we first attach A as its backing node: |
| 5218 | * |
| 5219 | * node B |
| 5220 | * | |
| 5221 | * v |
| 5222 | * guest device -> node A -> further backing chain... |
| 5223 | * |
| 5224 | * Finally we want to replace A by B. When doing that, we want to |
| 5225 | * replace all pointers to A by pointers to B -- except for the |
| 5226 | * pointer from B because (1) that would create a loop, and (2) |
| 5227 | * that pointer should simply stay intact: |
| 5228 | * |
| 5229 | * guest device -> node B |
| 5230 | * | |
| 5231 | * v |
| 5232 | * node A -> further backing chain... |
| 5233 | * |
| 5234 | * In general, when replacing a node A (c->bs) by a node B (@to), |
| 5235 | * if A is a child of B, that means we cannot replace A by B there |
| 5236 | * because that would create a loop. Silently detaching A from B |
| 5237 | * is also not really an option. So overall just leaving A in |
Vladimir Sementsov-Ogievskiy | 2f30b7c | 2019-02-23 22:20:39 +0300 | [diff] [blame] | 5238 | * place there is the most sensible choice. |
| 5239 | * |
| 5240 | * We would also create a loop in any cases where @c is only |
| 5241 | * indirectly referenced by @to. Prevent this by returning false |
| 5242 | * if @c is found (by breadth-first search) anywhere in the whole |
| 5243 | * subtree of @to. |
| 5244 | */ |
| 5245 | |
| 5246 | ret = true; |
| 5247 | found = g_hash_table_new(NULL, NULL); |
| 5248 | g_hash_table_add(found, to); |
| 5249 | queue = g_queue_new(); |
| 5250 | g_queue_push_tail(queue, to); |
| 5251 | |
| 5252 | while (!g_queue_is_empty(queue)) { |
| 5253 | BlockDriverState *v = g_queue_pop_head(queue); |
| 5254 | BdrvChild *c2; |
| 5255 | |
| 5256 | QLIST_FOREACH(c2, &v->children, next) { |
| 5257 | if (c2 == c) { |
| 5258 | ret = false; |
| 5259 | break; |
| 5260 | } |
| 5261 | |
| 5262 | if (g_hash_table_contains(found, c2->bs)) { |
| 5263 | continue; |
| 5264 | } |
| 5265 | |
| 5266 | g_queue_push_tail(queue, c2->bs); |
| 5267 | g_hash_table_add(found, c2->bs); |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 5268 | } |
| 5269 | } |
| 5270 | |
Vladimir Sementsov-Ogievskiy | 2f30b7c | 2019-02-23 22:20:39 +0300 | [diff] [blame] | 5271 | g_queue_free(queue); |
| 5272 | g_hash_table_destroy(found); |
| 5273 | |
| 5274 | return ret; |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 5275 | } |
| 5276 | |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 5277 | static void bdrv_remove_child_commit(void *opaque) |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5278 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 5279 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 5280 | bdrv_child_free(opaque); |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5281 | } |
| 5282 | |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 5283 | static TransactionActionDrv bdrv_remove_child_drv = { |
| 5284 | .commit = bdrv_remove_child_commit, |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5285 | }; |
| 5286 | |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5287 | /* |
| 5288 | * Function doesn't update permissions, caller is responsible for this. |
| 5289 | * |
| 5290 | * @child->bs (if non-NULL) must be drained. |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 5291 | * |
| 5292 | * After calling this function, the transaction @tran may only be completed |
| 5293 | * while holding a writer lock for the graph. |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5294 | */ |
| 5295 | static void GRAPH_WRLOCK bdrv_remove_child(BdrvChild *child, Transaction *tran) |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5296 | { |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5297 | if (!child) { |
| 5298 | return; |
| 5299 | } |
| 5300 | |
| 5301 | if (child->bs) { |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5302 | assert(child->quiesced_parent); |
Vladimir Sementsov-Ogievskiy | a2c37a3 | 2022-07-26 23:11:30 +0300 | [diff] [blame] | 5303 | bdrv_replace_child_tran(child, NULL, tran); |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5304 | } |
| 5305 | |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 5306 | tran_add(tran, &bdrv_remove_child_drv, child); |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5307 | } |
| 5308 | |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5309 | /* |
| 5310 | * Both @from and @to (if non-NULL) must be drained. @to must be kept drained |
| 5311 | * until the transaction is completed. |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 5312 | * |
| 5313 | * After calling this function, the transaction @tran may only be completed |
| 5314 | * while holding a writer lock for the graph. |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5315 | */ |
| 5316 | static int GRAPH_WRLOCK |
| 5317 | bdrv_replace_node_noperm(BlockDriverState *from, |
| 5318 | BlockDriverState *to, |
| 5319 | bool auto_skip, Transaction *tran, |
| 5320 | Error **errp) |
Vladimir Sementsov-Ogievskiy | 117caba | 2021-04-28 18:17:48 +0300 | [diff] [blame] | 5321 | { |
| 5322 | BdrvChild *c, *next; |
| 5323 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 5324 | GLOBAL_STATE_CODE(); |
Hanna Reitz | 82b54cf | 2021-11-15 15:54:04 +0100 | [diff] [blame] | 5325 | |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5326 | assert(from->quiesce_counter); |
| 5327 | assert(to->quiesce_counter); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 5328 | |
Vladimir Sementsov-Ogievskiy | 117caba | 2021-04-28 18:17:48 +0300 | [diff] [blame] | 5329 | QLIST_FOREACH_SAFE(c, &from->parents, next_parent, next) { |
| 5330 | assert(c->bs == from); |
| 5331 | if (!should_update_child(c, to)) { |
| 5332 | if (auto_skip) { |
| 5333 | continue; |
| 5334 | } |
| 5335 | error_setg(errp, "Should not change '%s' link to '%s'", |
| 5336 | c->name, from->node_name); |
| 5337 | return -EINVAL; |
| 5338 | } |
| 5339 | if (c->frozen) { |
| 5340 | error_setg(errp, "Cannot change '%s' link to '%s'", |
| 5341 | c->name, from->node_name); |
| 5342 | return -EPERM; |
| 5343 | } |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 5344 | bdrv_replace_child_tran(c, to, tran); |
Vladimir Sementsov-Ogievskiy | 117caba | 2021-04-28 18:17:48 +0300 | [diff] [blame] | 5345 | } |
| 5346 | |
| 5347 | return 0; |
| 5348 | } |
| 5349 | |
Vladimir Sementsov-Ogievskiy | 313274b | 2020-11-06 15:42:36 +0300 | [diff] [blame] | 5350 | /* |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5351 | * Switch all parents of @from to point to @to instead. @from and @to must be in |
| 5352 | * the same AioContext and both must be drained. |
| 5353 | * |
Vladimir Sementsov-Ogievskiy | 313274b | 2020-11-06 15:42:36 +0300 | [diff] [blame] | 5354 | * With auto_skip=true bdrv_replace_node_common skips updating from parents |
| 5355 | * if it creates a parent-child relation loop or if parent is block-job. |
| 5356 | * |
| 5357 | * With auto_skip=false the error is returned if from has a parent which should |
| 5358 | * not be updated. |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5359 | * |
| 5360 | * With @detach_subchain=true @to must be in a backing chain of @from. In this |
| 5361 | * case backing link of the cow-parent of @to is removed. |
Vladimir Sementsov-Ogievskiy | 313274b | 2020-11-06 15:42:36 +0300 | [diff] [blame] | 5362 | */ |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5363 | static int GRAPH_WRLOCK |
| 5364 | bdrv_replace_node_common(BlockDriverState *from, BlockDriverState *to, |
| 5365 | bool auto_skip, bool detach_subchain, Error **errp) |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5366 | { |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5367 | Transaction *tran = tran_new(); |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5368 | g_autoptr(GSList) refresh_list = NULL; |
Miroslav Rezanina | 2d369d6 | 2021-05-05 03:59:03 -0400 | [diff] [blame] | 5369 | BlockDriverState *to_cow_parent = NULL; |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5370 | int ret; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5371 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 5372 | GLOBAL_STATE_CODE(); |
Hanna Reitz | 82b54cf | 2021-11-15 15:54:04 +0100 | [diff] [blame] | 5373 | |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5374 | assert(from->quiesce_counter); |
| 5375 | assert(to->quiesce_counter); |
Kevin Wolf | 30dd65f | 2020-03-10 12:38:29 +0100 | [diff] [blame] | 5376 | assert(bdrv_get_aio_context(from) == bdrv_get_aio_context(to)); |
Kevin Wolf | f871abd | 2019-05-21 19:00:25 +0200 | [diff] [blame] | 5377 | |
Kevin Wolf | 372b69f | 2023-10-27 17:53:15 +0200 | [diff] [blame] | 5378 | if (detach_subchain) { |
| 5379 | assert(bdrv_chain_contains(from, to)); |
| 5380 | assert(from != to); |
| 5381 | for (to_cow_parent = from; |
| 5382 | bdrv_filter_or_cow_bs(to_cow_parent) != to; |
| 5383 | to_cow_parent = bdrv_filter_or_cow_bs(to_cow_parent)) |
| 5384 | { |
| 5385 | ; |
| 5386 | } |
| 5387 | } |
| 5388 | |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5389 | /* |
| 5390 | * Do the replacement without permission update. |
| 5391 | * Replacement may influence the permissions, we should calculate new |
| 5392 | * permissions based on new graph. If we fail, we'll roll-back the |
| 5393 | * replacement. |
| 5394 | */ |
Vladimir Sementsov-Ogievskiy | 117caba | 2021-04-28 18:17:48 +0300 | [diff] [blame] | 5395 | ret = bdrv_replace_node_noperm(from, to, auto_skip, tran, errp); |
| 5396 | if (ret < 0) { |
| 5397 | goto out; |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5398 | } |
| 5399 | |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5400 | if (detach_subchain) { |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5401 | /* to_cow_parent is already drained because from is drained */ |
Vladimir Sementsov-Ogievskiy | f38eaec | 2022-11-07 19:35:56 +0300 | [diff] [blame] | 5402 | bdrv_remove_child(bdrv_filter_or_cow_child(to_cow_parent), tran); |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5403 | } |
| 5404 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 5405 | refresh_list = g_slist_prepend(refresh_list, to); |
| 5406 | refresh_list = g_slist_prepend(refresh_list, from); |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5407 | |
| 5408 | ret = bdrv_list_refresh_perms(refresh_list, NULL, tran, errp); |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5409 | if (ret < 0) { |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5410 | goto out; |
| 5411 | } |
| 5412 | |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 5413 | ret = 0; |
| 5414 | |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5415 | out: |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5416 | tran_finalize(tran, ret); |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5417 | return ret; |
| 5418 | } |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5419 | |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5420 | int bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, |
| 5421 | Error **errp) |
| 5422 | { |
Kevin Wolf | ccd6a37 | 2023-10-27 17:53:25 +0200 | [diff] [blame] | 5423 | return bdrv_replace_node_common(from, to, true, false, errp); |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5424 | } |
| 5425 | |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5426 | int bdrv_drop_filter(BlockDriverState *bs, Error **errp) |
| 5427 | { |
Kevin Wolf | 372b69f | 2023-10-27 17:53:15 +0200 | [diff] [blame] | 5428 | BlockDriverState *child_bs; |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5429 | int ret; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5430 | |
Kevin Wolf | 372b69f | 2023-10-27 17:53:15 +0200 | [diff] [blame] | 5431 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5432 | |
Kevin Wolf | 372b69f | 2023-10-27 17:53:15 +0200 | [diff] [blame] | 5433 | bdrv_graph_rdlock_main_loop(); |
| 5434 | child_bs = bdrv_filter_or_cow_bs(bs); |
| 5435 | bdrv_graph_rdunlock_main_loop(); |
| 5436 | |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5437 | bdrv_drained_begin(child_bs); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5438 | bdrv_graph_wrlock(); |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5439 | ret = bdrv_replace_node_common(bs, child_bs, true, true, errp); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5440 | bdrv_graph_wrunlock(); |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5441 | bdrv_drained_end(child_bs); |
| 5442 | |
| 5443 | return ret; |
Vladimir Sementsov-Ogievskiy | 313274b | 2020-11-06 15:42:36 +0300 | [diff] [blame] | 5444 | } |
| 5445 | |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5446 | /* |
| 5447 | * Add new bs contents at the top of an image chain while the chain is |
| 5448 | * live, while keeping required fields on the top layer. |
| 5449 | * |
| 5450 | * This will modify the BlockDriverState fields, and swap contents |
| 5451 | * between bs_new and bs_top. Both bs_new and bs_top are modified. |
| 5452 | * |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5453 | * bs_new must not be attached to a BlockBackend and must not have backing |
| 5454 | * child. |
Jeff Cody | f6801b8 | 2012-03-27 16:30:19 -0400 | [diff] [blame] | 5455 | * |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5456 | * This function does not create any image files. |
| 5457 | */ |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 5458 | int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, |
| 5459 | Error **errp) |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5460 | { |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5461 | int ret; |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 5462 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5463 | Transaction *tran = tran_new(); |
| 5464 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5465 | GLOBAL_STATE_CODE(); |
| 5466 | |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 5467 | bdrv_graph_rdlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5468 | assert(!bs_new->backing); |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 5469 | bdrv_graph_rdunlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5470 | |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 5471 | bdrv_drained_begin(bs_top); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 5472 | bdrv_drained_begin(bs_new); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 5473 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5474 | bdrv_graph_wrlock(); |
Stefano Garzarella | 60d90bf | 2023-02-14 18:16:21 +0100 | [diff] [blame] | 5475 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 5476 | child = bdrv_attach_child_noperm(bs_new, bs_top, "backing", |
| 5477 | &child_of_bds, bdrv_backing_role(bs_new), |
| 5478 | tran, errp); |
| 5479 | if (!child) { |
| 5480 | ret = -EINVAL; |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5481 | goto out; |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 5482 | } |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5483 | |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5484 | ret = bdrv_replace_node_noperm(bs_top, bs_new, true, tran, errp); |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 5485 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5486 | goto out; |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5487 | } |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5488 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 5489 | ret = bdrv_refresh_perms(bs_new, tran, errp); |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5490 | out: |
| 5491 | tran_finalize(tran, ret); |
| 5492 | |
Vladimir Sementsov-Ogievskiy | 1e4c797 | 2021-04-28 18:17:55 +0300 | [diff] [blame] | 5493 | bdrv_refresh_limits(bs_top, NULL, NULL); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5494 | bdrv_graph_wrunlock(); |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5495 | |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 5496 | bdrv_drained_end(bs_top); |
| 5497 | bdrv_drained_end(bs_new); |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5498 | |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5499 | return ret; |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5500 | } |
| 5501 | |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5502 | /* Not for empty child */ |
| 5503 | int bdrv_replace_child_bs(BdrvChild *child, BlockDriverState *new_bs, |
| 5504 | Error **errp) |
| 5505 | { |
| 5506 | int ret; |
| 5507 | Transaction *tran = tran_new(); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5508 | g_autoptr(GSList) refresh_list = NULL; |
| 5509 | BlockDriverState *old_bs = child->bs; |
| 5510 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5511 | GLOBAL_STATE_CODE(); |
| 5512 | |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5513 | bdrv_ref(old_bs); |
| 5514 | bdrv_drained_begin(old_bs); |
| 5515 | bdrv_drained_begin(new_bs); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5516 | bdrv_graph_wrlock(); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5517 | |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 5518 | bdrv_replace_child_tran(child, new_bs, tran); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5519 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 5520 | refresh_list = g_slist_prepend(refresh_list, old_bs); |
| 5521 | refresh_list = g_slist_prepend(refresh_list, new_bs); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5522 | |
| 5523 | ret = bdrv_list_refresh_perms(refresh_list, NULL, tran, errp); |
| 5524 | |
| 5525 | tran_finalize(tran, ret); |
| 5526 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5527 | bdrv_graph_wrunlock(); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5528 | bdrv_drained_end(old_bs); |
| 5529 | bdrv_drained_end(new_bs); |
| 5530 | bdrv_unref(old_bs); |
| 5531 | |
| 5532 | return ret; |
| 5533 | } |
| 5534 | |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 5535 | static void bdrv_delete(BlockDriverState *bs) |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 5536 | { |
Fam Zheng | 3718d8a | 2014-05-23 21:29:43 +0800 | [diff] [blame] | 5537 | assert(bdrv_op_blocker_is_empty(bs)); |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 5538 | assert(!bs->refcnt); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5539 | GLOBAL_STATE_CODE(); |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 5540 | |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 5541 | /* remove from list, if necessary */ |
Kevin Wolf | 63eaaae | 2016-03-18 10:46:57 +0100 | [diff] [blame] | 5542 | if (bs->node_name[0] != '\0') { |
| 5543 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); |
| 5544 | } |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 5545 | QTAILQ_REMOVE(&all_bdrv_states, bs, bs_list); |
| 5546 | |
Anton Kuchin | 30c321f | 2019-05-07 11:12:56 +0300 | [diff] [blame] | 5547 | bdrv_close(bs); |
| 5548 | |
Stefan Hajnoczi | fa9185f | 2023-08-08 11:58:52 -0400 | [diff] [blame] | 5549 | qemu_mutex_destroy(&bs->reqs_lock); |
| 5550 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 5551 | g_free(bs); |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 5552 | } |
| 5553 | |
Vladimir Sementsov-Ogievskiy | 96796fa | 2021-09-20 14:55:36 +0300 | [diff] [blame] | 5554 | |
| 5555 | /* |
| 5556 | * Replace @bs by newly created block node. |
| 5557 | * |
| 5558 | * @options is a QDict of options to pass to the block drivers, or NULL for an |
| 5559 | * empty set of options. The reference to the QDict belongs to the block layer |
| 5560 | * after the call (even on failure), so if the caller intends to reuse the |
| 5561 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. |
Kevin Wolf | 8823407 | 2023-05-25 14:47:11 +0200 | [diff] [blame] | 5562 | * |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 5563 | * The caller must make sure that @bs stays in the same AioContext, i.e. |
| 5564 | * @options must not refer to nodes in a different AioContext. |
Vladimir Sementsov-Ogievskiy | 96796fa | 2021-09-20 14:55:36 +0300 | [diff] [blame] | 5565 | */ |
| 5566 | BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *options, |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5567 | int flags, Error **errp) |
| 5568 | { |
Vladimir Sementsov-Ogievskiy | f053b7e | 2021-09-20 14:55:35 +0300 | [diff] [blame] | 5569 | ERRP_GUARD(); |
| 5570 | int ret; |
Kevin Wolf | 8823407 | 2023-05-25 14:47:11 +0200 | [diff] [blame] | 5571 | AioContext *ctx = bdrv_get_aio_context(bs); |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5572 | BlockDriverState *new_node_bs = NULL; |
| 5573 | const char *drvname, *node_name; |
| 5574 | BlockDriver *drv; |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5575 | |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5576 | drvname = qdict_get_try_str(options, "driver"); |
| 5577 | if (!drvname) { |
| 5578 | error_setg(errp, "driver is not specified"); |
| 5579 | goto fail; |
| 5580 | } |
| 5581 | |
| 5582 | drv = bdrv_find_format(drvname); |
| 5583 | if (!drv) { |
| 5584 | error_setg(errp, "Unknown driver: '%s'", drvname); |
| 5585 | goto fail; |
| 5586 | } |
| 5587 | |
| 5588 | node_name = qdict_get_try_str(options, "node-name"); |
| 5589 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5590 | GLOBAL_STATE_CODE(); |
| 5591 | |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5592 | new_node_bs = bdrv_new_open_driver_opts(drv, node_name, options, flags, |
| 5593 | errp); |
Kevin Wolf | 8823407 | 2023-05-25 14:47:11 +0200 | [diff] [blame] | 5594 | assert(bdrv_get_aio_context(bs) == ctx); |
| 5595 | |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5596 | options = NULL; /* bdrv_new_open_driver() eats options */ |
| 5597 | if (!new_node_bs) { |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5598 | error_prepend(errp, "Could not create node: "); |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5599 | goto fail; |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5600 | } |
| 5601 | |
Kevin Wolf | ccd6a37 | 2023-10-27 17:53:25 +0200 | [diff] [blame] | 5602 | /* |
| 5603 | * Make sure that @bs doesn't go away until we have successfully attached |
| 5604 | * all of its parents to @new_node_bs and undrained it again. |
| 5605 | */ |
| 5606 | bdrv_ref(bs); |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5607 | bdrv_drained_begin(bs); |
Kevin Wolf | ccd6a37 | 2023-10-27 17:53:25 +0200 | [diff] [blame] | 5608 | bdrv_drained_begin(new_node_bs); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5609 | bdrv_graph_wrlock(); |
Vladimir Sementsov-Ogievskiy | f053b7e | 2021-09-20 14:55:35 +0300 | [diff] [blame] | 5610 | ret = bdrv_replace_node(bs, new_node_bs, errp); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5611 | bdrv_graph_wrunlock(); |
Kevin Wolf | ccd6a37 | 2023-10-27 17:53:25 +0200 | [diff] [blame] | 5612 | bdrv_drained_end(new_node_bs); |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5613 | bdrv_drained_end(bs); |
Kevin Wolf | ccd6a37 | 2023-10-27 17:53:25 +0200 | [diff] [blame] | 5614 | bdrv_unref(bs); |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5615 | |
Vladimir Sementsov-Ogievskiy | f053b7e | 2021-09-20 14:55:35 +0300 | [diff] [blame] | 5616 | if (ret < 0) { |
| 5617 | error_prepend(errp, "Could not replace node: "); |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5618 | goto fail; |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5619 | } |
| 5620 | |
| 5621 | return new_node_bs; |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5622 | |
| 5623 | fail: |
| 5624 | qobject_unref(options); |
| 5625 | bdrv_unref(new_node_bs); |
| 5626 | return NULL; |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5627 | } |
| 5628 | |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 5629 | /* |
| 5630 | * Run consistency checks on an image |
| 5631 | * |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 5632 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
Stefan Weil | a1c7273 | 2011-04-28 17:20:38 +0200 | [diff] [blame] | 5633 | * free of errors) or -errno when an internal error occurred. The results of the |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 5634 | * check are stored in res. |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 5635 | */ |
Vladimir Sementsov-Ogievskiy | 21c2283 | 2020-09-24 21:54:10 +0300 | [diff] [blame] | 5636 | int coroutine_fn bdrv_co_check(BlockDriverState *bs, |
| 5637 | BdrvCheckResult *res, BdrvCheckMode fix) |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 5638 | { |
Emanuele Giuseppe Esposito | 1581a70 | 2022-03-03 10:16:09 -0500 | [diff] [blame] | 5639 | IO_CODE(); |
Kevin Wolf | 1b3ff9f | 2022-12-07 14:18:38 +0100 | [diff] [blame] | 5640 | assert_bdrv_graph_readable(); |
Max Reitz | 908bcd5 | 2014-08-07 22:47:55 +0200 | [diff] [blame] | 5641 | if (bs->drv == NULL) { |
| 5642 | return -ENOMEDIUM; |
| 5643 | } |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 5644 | if (bs->drv->bdrv_co_check == NULL) { |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 5645 | return -ENOTSUP; |
| 5646 | } |
| 5647 | |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 5648 | memset(res, 0, sizeof(*res)); |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 5649 | return bs->drv->bdrv_co_check(bs, res, fix); |
| 5650 | } |
| 5651 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5652 | /* |
| 5653 | * Return values: |
| 5654 | * 0 - success |
| 5655 | * -EINVAL - backing format specified, but no file |
| 5656 | * -ENOSPC - can't update the backing file because no space is left in the |
| 5657 | * image file header |
| 5658 | * -ENOTSUP - format driver doesn't support changing the backing file |
| 5659 | */ |
Kevin Wolf | e2dd273 | 2023-10-27 17:53:28 +0200 | [diff] [blame] | 5660 | int coroutine_fn |
| 5661 | bdrv_co_change_backing_file(BlockDriverState *bs, const char *backing_file, |
| 5662 | const char *backing_fmt, bool require) |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5663 | { |
| 5664 | BlockDriver *drv = bs->drv; |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5665 | int ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5666 | |
Kevin Wolf | e2dd273 | 2023-10-27 17:53:28 +0200 | [diff] [blame] | 5667 | IO_CODE(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5668 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 5669 | if (!drv) { |
| 5670 | return -ENOMEDIUM; |
| 5671 | } |
| 5672 | |
Paolo Bonzini | 5f37779 | 2012-04-12 14:01:01 +0200 | [diff] [blame] | 5673 | /* Backing file format doesn't make sense without a backing file */ |
| 5674 | if (backing_fmt && !backing_file) { |
| 5675 | return -EINVAL; |
| 5676 | } |
| 5677 | |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 5678 | if (require && backing_file && !backing_fmt) { |
| 5679 | return -EINVAL; |
Eric Blake | e54ee1b | 2020-07-06 15:39:53 -0500 | [diff] [blame] | 5680 | } |
| 5681 | |
Kevin Wolf | e2dd273 | 2023-10-27 17:53:28 +0200 | [diff] [blame] | 5682 | if (drv->bdrv_co_change_backing_file != NULL) { |
| 5683 | ret = drv->bdrv_co_change_backing_file(bs, backing_file, backing_fmt); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5684 | } else { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5685 | ret = -ENOTSUP; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5686 | } |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5687 | |
| 5688 | if (ret == 0) { |
| 5689 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
| 5690 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 5691 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), |
| 5692 | backing_file ?: ""); |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5693 | } |
| 5694 | return ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5695 | } |
| 5696 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5697 | /* |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 5698 | * Finds the first non-filter node above bs in the chain between |
| 5699 | * active and bs. The returned node is either an immediate parent of |
| 5700 | * bs, or there are only filter nodes between the two. |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5701 | * |
| 5702 | * Returns NULL if bs is not found in active's image chain, |
| 5703 | * or if active == bs. |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 5704 | * |
| 5705 | * Returns the bottommost base image if bs == NULL. |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5706 | */ |
| 5707 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, |
| 5708 | BlockDriverState *bs) |
| 5709 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5710 | |
| 5711 | GLOBAL_STATE_CODE(); |
| 5712 | |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 5713 | bs = bdrv_skip_filters(bs); |
| 5714 | active = bdrv_skip_filters(active); |
| 5715 | |
| 5716 | while (active) { |
| 5717 | BlockDriverState *next = bdrv_backing_chain_next(active); |
| 5718 | if (bs == next) { |
| 5719 | return active; |
| 5720 | } |
| 5721 | active = next; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5722 | } |
| 5723 | |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 5724 | return NULL; |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 5725 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5726 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 5727 | /* Given a BDS, searches for the base layer. */ |
| 5728 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
| 5729 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5730 | GLOBAL_STATE_CODE(); |
| 5731 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 5732 | return bdrv_find_overlay(bs, NULL); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5733 | } |
| 5734 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5735 | /* |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5736 | * Return true if at least one of the COW (backing) and filter links |
| 5737 | * between @bs and @base is frozen. @errp is set if that's the case. |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5738 | * @base must be reachable from @bs, or NULL. |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5739 | */ |
Kevin Wolf | 9275fc7 | 2023-10-27 17:53:18 +0200 | [diff] [blame] | 5740 | static bool GRAPH_RDLOCK |
| 5741 | bdrv_is_backing_chain_frozen(BlockDriverState *bs, BlockDriverState *base, |
| 5742 | Error **errp) |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5743 | { |
| 5744 | BlockDriverState *i; |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5745 | BdrvChild *child; |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5746 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5747 | GLOBAL_STATE_CODE(); |
| 5748 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5749 | for (i = bs; i != base; i = child_bs(child)) { |
| 5750 | child = bdrv_filter_or_cow_child(i); |
| 5751 | |
| 5752 | if (child && child->frozen) { |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5753 | error_setg(errp, "Cannot change '%s' link from '%s' to '%s'", |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5754 | child->name, i->node_name, child->bs->node_name); |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5755 | return true; |
| 5756 | } |
| 5757 | } |
| 5758 | |
| 5759 | return false; |
| 5760 | } |
| 5761 | |
| 5762 | /* |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5763 | * Freeze all COW (backing) and filter links between @bs and @base. |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5764 | * If any of the links is already frozen the operation is aborted and |
| 5765 | * none of the links are modified. |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5766 | * @base must be reachable from @bs, or NULL. |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5767 | * Returns 0 on success. On failure returns < 0 and sets @errp. |
| 5768 | */ |
| 5769 | int bdrv_freeze_backing_chain(BlockDriverState *bs, BlockDriverState *base, |
| 5770 | Error **errp) |
| 5771 | { |
| 5772 | BlockDriverState *i; |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5773 | BdrvChild *child; |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5774 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5775 | GLOBAL_STATE_CODE(); |
| 5776 | |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5777 | if (bdrv_is_backing_chain_frozen(bs, base, errp)) { |
| 5778 | return -EPERM; |
| 5779 | } |
| 5780 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5781 | for (i = bs; i != base; i = child_bs(child)) { |
| 5782 | child = bdrv_filter_or_cow_child(i); |
| 5783 | if (child && child->bs->never_freeze) { |
Max Reitz | e5182c1 | 2019-07-03 19:28:02 +0200 | [diff] [blame] | 5784 | error_setg(errp, "Cannot freeze '%s' link to '%s'", |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5785 | child->name, child->bs->node_name); |
Max Reitz | e5182c1 | 2019-07-03 19:28:02 +0200 | [diff] [blame] | 5786 | return -EPERM; |
| 5787 | } |
| 5788 | } |
| 5789 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5790 | for (i = bs; i != base; i = child_bs(child)) { |
| 5791 | child = bdrv_filter_or_cow_child(i); |
| 5792 | if (child) { |
| 5793 | child->frozen = true; |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5794 | } |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5795 | } |
| 5796 | |
| 5797 | return 0; |
| 5798 | } |
| 5799 | |
| 5800 | /* |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5801 | * Unfreeze all COW (backing) and filter links between @bs and @base. |
| 5802 | * The caller must ensure that all links are frozen before using this |
| 5803 | * function. |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5804 | * @base must be reachable from @bs, or NULL. |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5805 | */ |
| 5806 | void bdrv_unfreeze_backing_chain(BlockDriverState *bs, BlockDriverState *base) |
| 5807 | { |
| 5808 | BlockDriverState *i; |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5809 | BdrvChild *child; |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5810 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5811 | GLOBAL_STATE_CODE(); |
| 5812 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5813 | for (i = bs; i != base; i = child_bs(child)) { |
| 5814 | child = bdrv_filter_or_cow_child(i); |
| 5815 | if (child) { |
| 5816 | assert(child->frozen); |
| 5817 | child->frozen = false; |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5818 | } |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5819 | } |
| 5820 | } |
| 5821 | |
| 5822 | /* |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5823 | * Drops images above 'base' up to and including 'top', and sets the image |
| 5824 | * above 'top' to have base as its backing file. |
| 5825 | * |
| 5826 | * Requires that the overlay to 'top' is opened r/w, so that the backing file |
| 5827 | * information in 'bs' can be properly updated. |
| 5828 | * |
| 5829 | * E.g., this will convert the following chain: |
| 5830 | * bottom <- base <- intermediate <- top <- active |
| 5831 | * |
| 5832 | * to |
| 5833 | * |
| 5834 | * bottom <- base <- active |
| 5835 | * |
| 5836 | * It is allowed for bottom==base, in which case it converts: |
| 5837 | * |
| 5838 | * base <- intermediate <- top <- active |
| 5839 | * |
| 5840 | * to |
| 5841 | * |
| 5842 | * base <- active |
| 5843 | * |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 5844 | * If backing_file_str is non-NULL, it will be used when modifying top's |
| 5845 | * overlay image metadata. |
| 5846 | * |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5847 | * Error conditions: |
| 5848 | * if active == top, that is considered an error |
| 5849 | * |
| 5850 | */ |
Kevin Wolf | bde7071 | 2017-06-27 20:36:18 +0200 | [diff] [blame] | 5851 | int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base, |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame] | 5852 | const char *backing_file_str, |
| 5853 | bool backing_mask_protocol) |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5854 | { |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 5855 | BlockDriverState *explicit_top = top; |
| 5856 | bool update_inherits_from; |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5857 | BdrvChild *c; |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 5858 | Error *local_err = NULL; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5859 | int ret = -EIO; |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5860 | g_autoptr(GSList) updated_children = NULL; |
| 5861 | GSList *p; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5862 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5863 | GLOBAL_STATE_CODE(); |
| 5864 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 5865 | bdrv_ref(top); |
Kevin Wolf | 631086d | 2022-11-18 18:41:03 +0100 | [diff] [blame] | 5866 | bdrv_drained_begin(base); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5867 | bdrv_graph_wrlock(); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 5868 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5869 | if (!top->drv || !base->drv) { |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5870 | goto exit_wrlock; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5871 | } |
| 5872 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 5873 | /* Make sure that base is in the backing chain of top */ |
| 5874 | if (!bdrv_chain_contains(top, base)) { |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5875 | goto exit_wrlock; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5876 | } |
| 5877 | |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 5878 | /* If 'base' recursively inherits from 'top' then we should set |
| 5879 | * base->inherits_from to top->inherits_from after 'top' and all |
| 5880 | * other intermediate nodes have been dropped. |
| 5881 | * If 'top' is an implicit node (e.g. "commit_top") we should skip |
| 5882 | * it because no one inherits from it. We use explicit_top for that. */ |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 5883 | explicit_top = bdrv_skip_implicit_filters(explicit_top); |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 5884 | update_inherits_from = bdrv_inherits_from_recursive(base, explicit_top); |
| 5885 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5886 | /* success - we can delete the intermediate states, and link top->base */ |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 5887 | if (!backing_file_str) { |
| 5888 | bdrv_refresh_filename(base); |
| 5889 | backing_file_str = base->filename; |
| 5890 | } |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 5891 | |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5892 | QLIST_FOREACH(c, &top->parents, next_parent) { |
| 5893 | updated_children = g_slist_prepend(updated_children, c); |
| 5894 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 5895 | |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5896 | /* |
| 5897 | * It seems correct to pass detach_subchain=true here, but it triggers |
| 5898 | * one more yet not fixed bug, when due to nested aio_poll loop we switch to |
| 5899 | * another drained section, which modify the graph (for example, removing |
| 5900 | * the child, which we keep in updated_children list). So, it's a TODO. |
| 5901 | * |
| 5902 | * Note, bug triggered if pass detach_subchain=true here and run |
| 5903 | * test-bdrv-drain. test_drop_intermediate_poll() test-case will crash. |
| 5904 | * That's a FIXME. |
| 5905 | */ |
| 5906 | bdrv_replace_node_common(top, base, false, false, &local_err); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5907 | bdrv_graph_wrunlock(); |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5908 | |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5909 | if (local_err) { |
| 5910 | error_report_err(local_err); |
| 5911 | goto exit; |
| 5912 | } |
| 5913 | |
| 5914 | for (p = updated_children; p; p = p->next) { |
| 5915 | c = p->data; |
| 5916 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 5917 | if (c->klass->update_filename) { |
| 5918 | ret = c->klass->update_filename(c, base, backing_file_str, |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame] | 5919 | backing_mask_protocol, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 5920 | &local_err); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 5921 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5922 | /* |
| 5923 | * TODO: Actually, we want to rollback all previous iterations |
| 5924 | * of this loop, and (which is almost impossible) previous |
| 5925 | * bdrv_replace_node()... |
| 5926 | * |
| 5927 | * Note, that c->klass->update_filename may lead to permission |
| 5928 | * update, so it's a bad idea to call it inside permission |
| 5929 | * update transaction of bdrv_replace_node. |
| 5930 | */ |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 5931 | error_report_err(local_err); |
| 5932 | goto exit; |
| 5933 | } |
| 5934 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 5935 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5936 | |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 5937 | if (update_inherits_from) { |
| 5938 | base->inherits_from = explicit_top->inherits_from; |
| 5939 | } |
| 5940 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5941 | ret = 0; |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5942 | goto exit; |
| 5943 | |
| 5944 | exit_wrlock: |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5945 | bdrv_graph_wrunlock(); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5946 | exit: |
Kevin Wolf | 631086d | 2022-11-18 18:41:03 +0100 | [diff] [blame] | 5947 | bdrv_drained_end(base); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 5948 | bdrv_unref(top); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5949 | return ret; |
| 5950 | } |
| 5951 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 5952 | /** |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5953 | * Implementation of BlockDriver.bdrv_co_get_allocated_file_size() that |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5954 | * sums the size of all data-bearing children. (This excludes backing |
| 5955 | * children.) |
| 5956 | */ |
Emanuele Giuseppe Esposito | de33563 | 2023-05-04 13:57:43 +0200 | [diff] [blame] | 5957 | static int64_t coroutine_fn GRAPH_RDLOCK |
| 5958 | bdrv_sum_allocated_file_size(BlockDriverState *bs) |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5959 | { |
| 5960 | BdrvChild *child; |
| 5961 | int64_t child_size, sum = 0; |
| 5962 | |
| 5963 | QLIST_FOREACH(child, &bs->children, next) { |
| 5964 | if (child->role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA | |
| 5965 | BDRV_CHILD_FILTERED)) |
| 5966 | { |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5967 | child_size = bdrv_co_get_allocated_file_size(child->bs); |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5968 | if (child_size < 0) { |
| 5969 | return child_size; |
| 5970 | } |
| 5971 | sum += child_size; |
| 5972 | } |
| 5973 | } |
| 5974 | |
| 5975 | return sum; |
| 5976 | } |
| 5977 | |
| 5978 | /** |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5979 | * Length of a allocated file in bytes. Sparse files are counted by actual |
| 5980 | * allocated space. Return < 0 if error or unknown. |
| 5981 | */ |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5982 | int64_t coroutine_fn bdrv_co_get_allocated_file_size(BlockDriverState *bs) |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5983 | { |
| 5984 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 5985 | IO_CODE(); |
Emanuele Giuseppe Esposito | de33563 | 2023-05-04 13:57:43 +0200 | [diff] [blame] | 5986 | assert_bdrv_graph_readable(); |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 5987 | |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5988 | if (!drv) { |
| 5989 | return -ENOMEDIUM; |
| 5990 | } |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5991 | if (drv->bdrv_co_get_allocated_file_size) { |
| 5992 | return drv->bdrv_co_get_allocated_file_size(bs); |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5993 | } |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5994 | |
Paolo Bonzini | 41770f6 | 2022-11-24 16:21:18 +0100 | [diff] [blame] | 5995 | if (drv->protocol_name) { |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5996 | /* |
| 5997 | * Protocol drivers default to -ENOTSUP (most of their data is |
| 5998 | * not stored in any of their children (if they even have any), |
| 5999 | * so there is no generic way to figure it out). |
| 6000 | */ |
| 6001 | return -ENOTSUP; |
| 6002 | } else if (drv->is_filter) { |
| 6003 | /* Filter drivers default to the size of their filtered child */ |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 6004 | return bdrv_co_get_allocated_file_size(bdrv_filter_bs(bs)); |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 6005 | } else { |
| 6006 | /* Other drivers default to summing their children's sizes */ |
| 6007 | return bdrv_sum_allocated_file_size(bs); |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 6008 | } |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 6009 | } |
| 6010 | |
Stefan Hajnoczi | 90880ff | 2017-07-05 13:57:30 +0100 | [diff] [blame] | 6011 | /* |
| 6012 | * bdrv_measure: |
| 6013 | * @drv: Format driver |
| 6014 | * @opts: Creation options for new image |
| 6015 | * @in_bs: Existing image containing data for new image (may be NULL) |
| 6016 | * @errp: Error object |
| 6017 | * Returns: A #BlockMeasureInfo (free using qapi_free_BlockMeasureInfo()) |
| 6018 | * or NULL on error |
| 6019 | * |
| 6020 | * Calculate file size required to create a new image. |
| 6021 | * |
| 6022 | * If @in_bs is given then space for allocated clusters and zero clusters |
| 6023 | * from that image are included in the calculation. If @opts contains a |
| 6024 | * backing file that is shared by @in_bs then backing clusters may be omitted |
| 6025 | * from the calculation. |
| 6026 | * |
| 6027 | * If @in_bs is NULL then the calculation includes no allocated clusters |
| 6028 | * unless a preallocation option is given in @opts. |
| 6029 | * |
| 6030 | * Note that @in_bs may use a different BlockDriver from @drv. |
| 6031 | * |
| 6032 | * If an error occurs the @errp pointer is set. |
| 6033 | */ |
| 6034 | BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts, |
| 6035 | BlockDriverState *in_bs, Error **errp) |
| 6036 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6037 | IO_CODE(); |
Stefan Hajnoczi | 90880ff | 2017-07-05 13:57:30 +0100 | [diff] [blame] | 6038 | if (!drv->bdrv_measure) { |
| 6039 | error_setg(errp, "Block driver '%s' does not support size measurement", |
| 6040 | drv->format_name); |
| 6041 | return NULL; |
| 6042 | } |
| 6043 | |
| 6044 | return drv->bdrv_measure(opts, in_bs, errp); |
| 6045 | } |
| 6046 | |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 6047 | /** |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6048 | * Return number of sectors on success, -errno on error. |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 6049 | */ |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6050 | int64_t coroutine_fn bdrv_co_nb_sectors(BlockDriverState *bs) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 6051 | { |
| 6052 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6053 | IO_CODE(); |
Kevin Wolf | 8ab8140 | 2023-02-03 16:22:02 +0100 | [diff] [blame] | 6054 | assert_bdrv_graph_readable(); |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6055 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 6056 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6057 | return -ENOMEDIUM; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 6058 | |
Paolo Bonzini | 160a29e | 2023-04-07 17:32:56 +0200 | [diff] [blame] | 6059 | if (bs->bl.has_variable_length) { |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6060 | int ret = bdrv_co_refresh_total_sectors(bs, bs->total_sectors); |
Kevin Wolf | b94a261 | 2013-10-29 12:18:58 +0100 | [diff] [blame] | 6061 | if (ret < 0) { |
| 6062 | return ret; |
Stefan Hajnoczi | 46a4e4e | 2011-03-29 20:04:41 +0100 | [diff] [blame] | 6063 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 6064 | } |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6065 | return bs->total_sectors; |
| 6066 | } |
| 6067 | |
Paolo Bonzini | 81f730d | 2023-04-07 17:33:03 +0200 | [diff] [blame] | 6068 | /* |
| 6069 | * This wrapper is written by hand because this function is in the hot I/O path, |
| 6070 | * via blk_get_geometry. |
| 6071 | */ |
| 6072 | int64_t coroutine_mixed_fn bdrv_nb_sectors(BlockDriverState *bs) |
| 6073 | { |
| 6074 | BlockDriver *drv = bs->drv; |
| 6075 | IO_CODE(); |
| 6076 | |
| 6077 | if (!drv) |
| 6078 | return -ENOMEDIUM; |
| 6079 | |
| 6080 | if (bs->bl.has_variable_length) { |
| 6081 | int ret = bdrv_refresh_total_sectors(bs, bs->total_sectors); |
| 6082 | if (ret < 0) { |
| 6083 | return ret; |
| 6084 | } |
| 6085 | } |
| 6086 | |
| 6087 | return bs->total_sectors; |
| 6088 | } |
| 6089 | |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6090 | /** |
| 6091 | * Return length in bytes on success, -errno on error. |
| 6092 | * The length is always a multiple of BDRV_SECTOR_SIZE. |
| 6093 | */ |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6094 | int64_t coroutine_fn bdrv_co_getlength(BlockDriverState *bs) |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6095 | { |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6096 | int64_t ret; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6097 | IO_CODE(); |
Kevin Wolf | 8ab8140 | 2023-02-03 16:22:02 +0100 | [diff] [blame] | 6098 | assert_bdrv_graph_readable(); |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6099 | |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6100 | ret = bdrv_co_nb_sectors(bs); |
Eric Blake | 122860b | 2020-11-05 09:51:22 -0600 | [diff] [blame] | 6101 | if (ret < 0) { |
| 6102 | return ret; |
| 6103 | } |
| 6104 | if (ret > INT64_MAX / BDRV_SECTOR_SIZE) { |
| 6105 | return -EFBIG; |
| 6106 | } |
| 6107 | return ret * BDRV_SECTOR_SIZE; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 6108 | } |
| 6109 | |
Eric Blake | 5411541 | 2016-06-23 16:37:26 -0600 | [diff] [blame] | 6110 | bool bdrv_is_sg(BlockDriverState *bs) |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 6111 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6112 | IO_CODE(); |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 6113 | return bs->sg; |
| 6114 | } |
| 6115 | |
Max Reitz | ae23f78 | 2019-06-12 22:57:15 +0200 | [diff] [blame] | 6116 | /** |
| 6117 | * Return whether the given node supports compressed writes. |
| 6118 | */ |
| 6119 | bool bdrv_supports_compressed_writes(BlockDriverState *bs) |
| 6120 | { |
| 6121 | BlockDriverState *filtered; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6122 | IO_CODE(); |
Max Reitz | ae23f78 | 2019-06-12 22:57:15 +0200 | [diff] [blame] | 6123 | |
| 6124 | if (!bs->drv || !block_driver_can_compress(bs->drv)) { |
| 6125 | return false; |
| 6126 | } |
| 6127 | |
| 6128 | filtered = bdrv_filter_bs(bs); |
| 6129 | if (filtered) { |
| 6130 | /* |
| 6131 | * Filters can only forward compressed writes, so we have to |
| 6132 | * check the child. |
| 6133 | */ |
| 6134 | return bdrv_supports_compressed_writes(filtered); |
| 6135 | } |
| 6136 | |
| 6137 | return true; |
| 6138 | } |
| 6139 | |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 6140 | const char *bdrv_get_format_name(BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6141 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6142 | IO_CODE(); |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 6143 | return bs->drv ? bs->drv->format_name : NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6144 | } |
| 6145 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6146 | static int qsort_strcmp(const void *a, const void *b) |
| 6147 | { |
Max Reitz | ceff5bd | 2016-10-12 22:49:05 +0200 | [diff] [blame] | 6148 | return strcmp(*(char *const *)a, *(char *const *)b); |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6149 | } |
| 6150 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 6151 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 6152 | void *opaque, bool read_only) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6153 | { |
| 6154 | BlockDriver *drv; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6155 | int count = 0; |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6156 | int i; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6157 | const char **formats = NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6158 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6159 | GLOBAL_STATE_CODE(); |
| 6160 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 6161 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6162 | if (drv->format_name) { |
| 6163 | bool found = false; |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 6164 | |
| 6165 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, read_only)) { |
| 6166 | continue; |
| 6167 | } |
| 6168 | |
Markus Armbruster | fb2575f | 2023-09-21 14:13:11 +0200 | [diff] [blame] | 6169 | i = count; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6170 | while (formats && i && !found) { |
| 6171 | found = !strcmp(formats[--i], drv->format_name); |
| 6172 | } |
| 6173 | |
| 6174 | if (!found) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 6175 | formats = g_renew(const char *, formats, count + 1); |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6176 | formats[count++] = drv->format_name; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6177 | } |
| 6178 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6179 | } |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6180 | |
Max Reitz | eb0df69 | 2016-10-12 22:49:06 +0200 | [diff] [blame] | 6181 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); i++) { |
| 6182 | const char *format_name = block_driver_modules[i].format_name; |
| 6183 | |
| 6184 | if (format_name) { |
| 6185 | bool found = false; |
| 6186 | int j = count; |
| 6187 | |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 6188 | if (use_bdrv_whitelist && |
| 6189 | !bdrv_format_is_whitelisted(format_name, read_only)) { |
| 6190 | continue; |
| 6191 | } |
| 6192 | |
Max Reitz | eb0df69 | 2016-10-12 22:49:06 +0200 | [diff] [blame] | 6193 | while (formats && j && !found) { |
| 6194 | found = !strcmp(formats[--j], format_name); |
| 6195 | } |
| 6196 | |
| 6197 | if (!found) { |
| 6198 | formats = g_renew(const char *, formats, count + 1); |
| 6199 | formats[count++] = format_name; |
| 6200 | } |
| 6201 | } |
| 6202 | } |
| 6203 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6204 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); |
| 6205 | |
| 6206 | for (i = 0; i < count; i++) { |
| 6207 | it(opaque, formats[i]); |
| 6208 | } |
| 6209 | |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6210 | g_free(formats); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6211 | } |
| 6212 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 6213 | /* This function is to find a node in the bs graph */ |
| 6214 | BlockDriverState *bdrv_find_node(const char *node_name) |
| 6215 | { |
| 6216 | BlockDriverState *bs; |
| 6217 | |
| 6218 | assert(node_name); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6219 | GLOBAL_STATE_CODE(); |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 6220 | |
| 6221 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 6222 | if (!strcmp(node_name, bs->node_name)) { |
| 6223 | return bs; |
| 6224 | } |
| 6225 | } |
| 6226 | return NULL; |
| 6227 | } |
| 6228 | |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6229 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
Peter Krempa | facda54 | 2020-01-20 09:50:49 +0100 | [diff] [blame] | 6230 | BlockDeviceInfoList *bdrv_named_nodes_list(bool flat, |
| 6231 | Error **errp) |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6232 | { |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6233 | BlockDeviceInfoList *list; |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6234 | BlockDriverState *bs; |
| 6235 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6236 | GLOBAL_STATE_CODE(); |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 6237 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6238 | |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6239 | list = NULL; |
| 6240 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
Peter Krempa | facda54 | 2020-01-20 09:50:49 +0100 | [diff] [blame] | 6241 | BlockDeviceInfo *info = bdrv_block_device_info(NULL, bs, flat, errp); |
Alberto Garcia | d5a8ee6 | 2015-04-17 14:52:43 +0300 | [diff] [blame] | 6242 | if (!info) { |
| 6243 | qapi_free_BlockDeviceInfoList(list); |
| 6244 | return NULL; |
| 6245 | } |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6246 | QAPI_LIST_PREPEND(list, info); |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6247 | } |
| 6248 | |
| 6249 | return list; |
| 6250 | } |
| 6251 | |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6252 | typedef struct XDbgBlockGraphConstructor { |
| 6253 | XDbgBlockGraph *graph; |
| 6254 | GHashTable *graph_nodes; |
| 6255 | } XDbgBlockGraphConstructor; |
| 6256 | |
| 6257 | static XDbgBlockGraphConstructor *xdbg_graph_new(void) |
| 6258 | { |
| 6259 | XDbgBlockGraphConstructor *gr = g_new(XDbgBlockGraphConstructor, 1); |
| 6260 | |
| 6261 | gr->graph = g_new0(XDbgBlockGraph, 1); |
| 6262 | gr->graph_nodes = g_hash_table_new(NULL, NULL); |
| 6263 | |
| 6264 | return gr; |
| 6265 | } |
| 6266 | |
| 6267 | static XDbgBlockGraph *xdbg_graph_finalize(XDbgBlockGraphConstructor *gr) |
| 6268 | { |
| 6269 | XDbgBlockGraph *graph = gr->graph; |
| 6270 | |
| 6271 | g_hash_table_destroy(gr->graph_nodes); |
| 6272 | g_free(gr); |
| 6273 | |
| 6274 | return graph; |
| 6275 | } |
| 6276 | |
| 6277 | static uintptr_t xdbg_graph_node_num(XDbgBlockGraphConstructor *gr, void *node) |
| 6278 | { |
| 6279 | uintptr_t ret = (uintptr_t)g_hash_table_lookup(gr->graph_nodes, node); |
| 6280 | |
| 6281 | if (ret != 0) { |
| 6282 | return ret; |
| 6283 | } |
| 6284 | |
| 6285 | /* |
| 6286 | * Start counting from 1, not 0, because 0 interferes with not-found (NULL) |
| 6287 | * answer of g_hash_table_lookup. |
| 6288 | */ |
| 6289 | ret = g_hash_table_size(gr->graph_nodes) + 1; |
| 6290 | g_hash_table_insert(gr->graph_nodes, node, (void *)ret); |
| 6291 | |
| 6292 | return ret; |
| 6293 | } |
| 6294 | |
| 6295 | static void xdbg_graph_add_node(XDbgBlockGraphConstructor *gr, void *node, |
| 6296 | XDbgBlockGraphNodeType type, const char *name) |
| 6297 | { |
| 6298 | XDbgBlockGraphNode *n; |
| 6299 | |
| 6300 | n = g_new0(XDbgBlockGraphNode, 1); |
| 6301 | |
| 6302 | n->id = xdbg_graph_node_num(gr, node); |
| 6303 | n->type = type; |
| 6304 | n->name = g_strdup(name); |
| 6305 | |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6306 | QAPI_LIST_PREPEND(gr->graph->nodes, n); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6307 | } |
| 6308 | |
| 6309 | static void xdbg_graph_add_edge(XDbgBlockGraphConstructor *gr, void *parent, |
| 6310 | const BdrvChild *child) |
| 6311 | { |
Max Reitz | cdb1cec | 2019-11-08 13:34:52 +0100 | [diff] [blame] | 6312 | BlockPermission qapi_perm; |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6313 | XDbgBlockGraphEdge *edge; |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 6314 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6315 | |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6316 | edge = g_new0(XDbgBlockGraphEdge, 1); |
| 6317 | |
| 6318 | edge->parent = xdbg_graph_node_num(gr, parent); |
| 6319 | edge->child = xdbg_graph_node_num(gr, child->bs); |
| 6320 | edge->name = g_strdup(child->name); |
| 6321 | |
Max Reitz | cdb1cec | 2019-11-08 13:34:52 +0100 | [diff] [blame] | 6322 | for (qapi_perm = 0; qapi_perm < BLOCK_PERMISSION__MAX; qapi_perm++) { |
| 6323 | uint64_t flag = bdrv_qapi_perm_to_blk_perm(qapi_perm); |
| 6324 | |
| 6325 | if (flag & child->perm) { |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6326 | QAPI_LIST_PREPEND(edge->perm, qapi_perm); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6327 | } |
Max Reitz | cdb1cec | 2019-11-08 13:34:52 +0100 | [diff] [blame] | 6328 | if (flag & child->shared_perm) { |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6329 | QAPI_LIST_PREPEND(edge->shared_perm, qapi_perm); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6330 | } |
| 6331 | } |
| 6332 | |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6333 | QAPI_LIST_PREPEND(gr->graph->edges, edge); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6334 | } |
| 6335 | |
| 6336 | |
| 6337 | XDbgBlockGraph *bdrv_get_xdbg_block_graph(Error **errp) |
| 6338 | { |
| 6339 | BlockBackend *blk; |
| 6340 | BlockJob *job; |
| 6341 | BlockDriverState *bs; |
| 6342 | BdrvChild *child; |
| 6343 | XDbgBlockGraphConstructor *gr = xdbg_graph_new(); |
| 6344 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6345 | GLOBAL_STATE_CODE(); |
| 6346 | |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6347 | for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) { |
| 6348 | char *allocated_name = NULL; |
| 6349 | const char *name = blk_name(blk); |
| 6350 | |
| 6351 | if (!*name) { |
| 6352 | name = allocated_name = blk_get_attached_dev_id(blk); |
| 6353 | } |
Markus Armbruster | bcd63b5 | 2024-09-04 13:18:20 +0200 | [diff] [blame] | 6354 | xdbg_graph_add_node(gr, blk, XDBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_BACKEND, |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6355 | name); |
| 6356 | g_free(allocated_name); |
| 6357 | if (blk_root(blk)) { |
| 6358 | xdbg_graph_add_edge(gr, blk, blk_root(blk)); |
| 6359 | } |
| 6360 | } |
| 6361 | |
Emanuele Giuseppe Esposito | 880eeec | 2022-09-26 05:32:04 -0400 | [diff] [blame] | 6362 | WITH_JOB_LOCK_GUARD() { |
| 6363 | for (job = block_job_next_locked(NULL); job; |
| 6364 | job = block_job_next_locked(job)) { |
| 6365 | GSList *el; |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6366 | |
Markus Armbruster | bcd63b5 | 2024-09-04 13:18:20 +0200 | [diff] [blame] | 6367 | xdbg_graph_add_node(gr, job, XDBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_JOB, |
Emanuele Giuseppe Esposito | 880eeec | 2022-09-26 05:32:04 -0400 | [diff] [blame] | 6368 | job->job.id); |
| 6369 | for (el = job->nodes; el; el = el->next) { |
| 6370 | xdbg_graph_add_edge(gr, job, (BdrvChild *)el->data); |
| 6371 | } |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6372 | } |
| 6373 | } |
| 6374 | |
| 6375 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
Markus Armbruster | bcd63b5 | 2024-09-04 13:18:20 +0200 | [diff] [blame] | 6376 | xdbg_graph_add_node(gr, bs, XDBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_DRIVER, |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6377 | bs->node_name); |
| 6378 | QLIST_FOREACH(child, &bs->children, next) { |
| 6379 | xdbg_graph_add_edge(gr, bs, child); |
| 6380 | } |
| 6381 | } |
| 6382 | |
| 6383 | return xdbg_graph_finalize(gr); |
| 6384 | } |
| 6385 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6386 | BlockDriverState *bdrv_lookup_bs(const char *device, |
| 6387 | const char *node_name, |
| 6388 | Error **errp) |
| 6389 | { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 6390 | BlockBackend *blk; |
| 6391 | BlockDriverState *bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6392 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6393 | GLOBAL_STATE_CODE(); |
| 6394 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6395 | if (device) { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 6396 | blk = blk_by_name(device); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6397 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 6398 | if (blk) { |
Alberto Garcia | 9f4ed6f | 2015-10-26 16:46:49 +0200 | [diff] [blame] | 6399 | bs = blk_bs(blk); |
| 6400 | if (!bs) { |
Max Reitz | 5433c24 | 2015-10-19 17:53:29 +0200 | [diff] [blame] | 6401 | error_setg(errp, "Device '%s' has no medium", device); |
Max Reitz | 5433c24 | 2015-10-19 17:53:29 +0200 | [diff] [blame] | 6402 | } |
| 6403 | |
Alberto Garcia | 9f4ed6f | 2015-10-26 16:46:49 +0200 | [diff] [blame] | 6404 | return bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6405 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6406 | } |
| 6407 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 6408 | if (node_name) { |
| 6409 | bs = bdrv_find_node(node_name); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6410 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 6411 | if (bs) { |
| 6412 | return bs; |
| 6413 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6414 | } |
| 6415 | |
Connor Kuehl | 785ec4b | 2021-03-05 09:19:28 -0600 | [diff] [blame] | 6416 | error_setg(errp, "Cannot find device=\'%s\' nor node-name=\'%s\'", |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 6417 | device ? device : "", |
| 6418 | node_name ? node_name : ""); |
| 6419 | return NULL; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6420 | } |
| 6421 | |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 6422 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
| 6423 | * return false. If either argument is NULL, return false. */ |
| 6424 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) |
| 6425 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6426 | |
| 6427 | GLOBAL_STATE_CODE(); |
| 6428 | |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 6429 | while (top && top != base) { |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6430 | top = bdrv_filter_or_cow_bs(top); |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 6431 | } |
| 6432 | |
| 6433 | return top != NULL; |
| 6434 | } |
| 6435 | |
Fam Zheng | 04df765 | 2014-10-31 11:32:54 +0800 | [diff] [blame] | 6436 | BlockDriverState *bdrv_next_node(BlockDriverState *bs) |
| 6437 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6438 | GLOBAL_STATE_CODE(); |
Fam Zheng | 04df765 | 2014-10-31 11:32:54 +0800 | [diff] [blame] | 6439 | if (!bs) { |
| 6440 | return QTAILQ_FIRST(&graph_bdrv_states); |
| 6441 | } |
| 6442 | return QTAILQ_NEXT(bs, node_list); |
| 6443 | } |
| 6444 | |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 6445 | BlockDriverState *bdrv_next_all_states(BlockDriverState *bs) |
| 6446 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6447 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 6448 | if (!bs) { |
| 6449 | return QTAILQ_FIRST(&all_bdrv_states); |
| 6450 | } |
| 6451 | return QTAILQ_NEXT(bs, bs_list); |
| 6452 | } |
| 6453 | |
Fam Zheng | 20a9e77 | 2014-10-31 11:32:55 +0800 | [diff] [blame] | 6454 | const char *bdrv_get_node_name(const BlockDriverState *bs) |
| 6455 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6456 | IO_CODE(); |
Fam Zheng | 20a9e77 | 2014-10-31 11:32:55 +0800 | [diff] [blame] | 6457 | return bs->node_name; |
| 6458 | } |
| 6459 | |
Kevin Wolf | 1f0c461 | 2016-03-22 18:38:44 +0100 | [diff] [blame] | 6460 | const char *bdrv_get_parent_name(const BlockDriverState *bs) |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6461 | { |
| 6462 | BdrvChild *c; |
| 6463 | const char *name; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 6464 | IO_CODE(); |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6465 | |
| 6466 | /* If multiple parents have a name, just pick the first one. */ |
| 6467 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 6468 | if (c->klass->get_name) { |
| 6469 | name = c->klass->get_name(c); |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6470 | if (name && *name) { |
| 6471 | return name; |
| 6472 | } |
| 6473 | } |
| 6474 | } |
| 6475 | |
| 6476 | return NULL; |
| 6477 | } |
| 6478 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 6479 | /* TODO check what callers really want: bs->node_name or blk_name() */ |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 6480 | const char *bdrv_get_device_name(const BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6481 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6482 | IO_CODE(); |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6483 | return bdrv_get_parent_name(bs) ?: ""; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6484 | } |
| 6485 | |
Alberto Garcia | 9b2aa84 | 2015-04-08 12:29:18 +0300 | [diff] [blame] | 6486 | /* This can be used to identify nodes that might not have a device |
| 6487 | * name associated. Since node and device names live in the same |
| 6488 | * namespace, the result is unambiguous. The exception is if both are |
| 6489 | * absent, then this returns an empty (non-null) string. */ |
| 6490 | const char *bdrv_get_device_or_node_name(const BlockDriverState *bs) |
| 6491 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6492 | IO_CODE(); |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6493 | return bdrv_get_parent_name(bs) ?: bs->node_name; |
Alberto Garcia | 9b2aa84 | 2015-04-08 12:29:18 +0300 | [diff] [blame] | 6494 | } |
| 6495 | |
Markus Armbruster | c843328 | 2012-06-05 16:49:24 +0200 | [diff] [blame] | 6496 | int bdrv_get_flags(BlockDriverState *bs) |
| 6497 | { |
Hanna Reitz | 15aee7a | 2022-04-27 13:40:54 +0200 | [diff] [blame] | 6498 | IO_CODE(); |
Markus Armbruster | c843328 | 2012-06-05 16:49:24 +0200 | [diff] [blame] | 6499 | return bs->open_flags; |
| 6500 | } |
| 6501 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 6502 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
| 6503 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6504 | GLOBAL_STATE_CODE(); |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 6505 | return 1; |
| 6506 | } |
| 6507 | |
Kevin Wolf | 0671798 | 2023-10-27 17:53:11 +0200 | [diff] [blame] | 6508 | int coroutine_mixed_fn bdrv_has_zero_init(BlockDriverState *bs) |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6509 | { |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 6510 | BlockDriverState *filtered; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6511 | GLOBAL_STATE_CODE(); |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 6512 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 6513 | if (!bs->drv) { |
| 6514 | return 0; |
| 6515 | } |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6516 | |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 6517 | /* If BS is a copy on write image, it is initialized to |
| 6518 | the contents of the base image, which may not be zeroes. */ |
Max Reitz | 3477817 | 2019-06-12 17:10:46 +0200 | [diff] [blame] | 6519 | if (bdrv_cow_child(bs)) { |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 6520 | return 0; |
| 6521 | } |
Kevin Wolf | 336c1c1 | 2010-07-28 11:26:29 +0200 | [diff] [blame] | 6522 | if (bs->drv->bdrv_has_zero_init) { |
| 6523 | return bs->drv->bdrv_has_zero_init(bs); |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6524 | } |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 6525 | |
| 6526 | filtered = bdrv_filter_bs(bs); |
| 6527 | if (filtered) { |
| 6528 | return bdrv_has_zero_init(filtered); |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6529 | } |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6530 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 6531 | /* safe default */ |
| 6532 | return 0; |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6533 | } |
| 6534 | |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 6535 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) |
| 6536 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6537 | IO_CODE(); |
Denis V. Lunev | 2f0342e | 2016-07-14 16:33:26 +0300 | [diff] [blame] | 6538 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 6539 | return false; |
| 6540 | } |
| 6541 | |
Eric Blake | e24d813 | 2018-01-26 13:34:39 -0600 | [diff] [blame] | 6542 | return bs->supported_zero_flags & BDRV_REQ_MAY_UNMAP; |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 6543 | } |
| 6544 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 6545 | void bdrv_get_backing_filename(BlockDriverState *bs, |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 6546 | char *filename, int filename_size) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6547 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6548 | IO_CODE(); |
Kevin Wolf | 3574c60 | 2011-10-26 11:02:11 +0200 | [diff] [blame] | 6549 | pstrcpy(filename, filename_size, bs->backing_file); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6550 | } |
| 6551 | |
Emanuele Giuseppe Esposito | 3d47eb0 | 2023-01-13 21:42:08 +0100 | [diff] [blame] | 6552 | int coroutine_fn bdrv_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6553 | { |
Vladimir Sementsov-Ogievskiy | 8b11700 | 2020-12-04 01:27:13 +0300 | [diff] [blame] | 6554 | int ret; |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6555 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6556 | IO_CODE(); |
Emanuele Giuseppe Esposito | a00e70c | 2023-05-04 13:57:44 +0200 | [diff] [blame] | 6557 | assert_bdrv_graph_readable(); |
| 6558 | |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6559 | /* if bs->drv == NULL, bs is closed, so there's nothing to do here */ |
| 6560 | if (!drv) { |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6561 | return -ENOMEDIUM; |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6562 | } |
Emanuele Giuseppe Esposito | 3d47eb0 | 2023-01-13 21:42:08 +0100 | [diff] [blame] | 6563 | if (!drv->bdrv_co_get_info) { |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 6564 | BlockDriverState *filtered = bdrv_filter_bs(bs); |
| 6565 | if (filtered) { |
Emanuele Giuseppe Esposito | 3d47eb0 | 2023-01-13 21:42:08 +0100 | [diff] [blame] | 6566 | return bdrv_co_get_info(filtered, bdi); |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6567 | } |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6568 | return -ENOTSUP; |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6569 | } |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6570 | memset(bdi, 0, sizeof(*bdi)); |
Emanuele Giuseppe Esposito | 3d47eb0 | 2023-01-13 21:42:08 +0100 | [diff] [blame] | 6571 | ret = drv->bdrv_co_get_info(bs, bdi); |
Andrey Drobyshev | c54483b | 2023-07-11 20:25:51 +0300 | [diff] [blame] | 6572 | if (bdi->subcluster_size == 0) { |
| 6573 | /* |
| 6574 | * If the driver left this unset, subclusters are not supported. |
| 6575 | * Then it is safe to treat each cluster as having only one subcluster. |
| 6576 | */ |
| 6577 | bdi->subcluster_size = bdi->cluster_size; |
| 6578 | } |
Vladimir Sementsov-Ogievskiy | 8b11700 | 2020-12-04 01:27:13 +0300 | [diff] [blame] | 6579 | if (ret < 0) { |
| 6580 | return ret; |
| 6581 | } |
| 6582 | |
| 6583 | if (bdi->cluster_size > BDRV_MAX_ALIGNMENT) { |
| 6584 | return -EINVAL; |
| 6585 | } |
| 6586 | |
| 6587 | return 0; |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6588 | } |
| 6589 | |
Andrey Shinkevich | 1bf6e9c | 2019-02-08 18:06:06 +0300 | [diff] [blame] | 6590 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs, |
| 6591 | Error **errp) |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 6592 | { |
| 6593 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6594 | IO_CODE(); |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 6595 | if (drv && drv->bdrv_get_specific_info) { |
Andrey Shinkevich | 1bf6e9c | 2019-02-08 18:06:06 +0300 | [diff] [blame] | 6596 | return drv->bdrv_get_specific_info(bs, errp); |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 6597 | } |
| 6598 | return NULL; |
| 6599 | } |
| 6600 | |
Anton Nefedov | d924559 | 2019-09-23 15:17:37 +0300 | [diff] [blame] | 6601 | BlockStatsSpecific *bdrv_get_specific_stats(BlockDriverState *bs) |
| 6602 | { |
| 6603 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6604 | IO_CODE(); |
Anton Nefedov | d924559 | 2019-09-23 15:17:37 +0300 | [diff] [blame] | 6605 | if (!drv || !drv->bdrv_get_specific_stats) { |
| 6606 | return NULL; |
| 6607 | } |
| 6608 | return drv->bdrv_get_specific_stats(bs); |
| 6609 | } |
| 6610 | |
Emanuele Giuseppe Esposito | c834dc0 | 2023-01-13 21:42:11 +0100 | [diff] [blame] | 6611 | void coroutine_fn bdrv_co_debug_event(BlockDriverState *bs, BlkdebugEvent event) |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 6612 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6613 | IO_CODE(); |
Emanuele Giuseppe Esposito | cb2bfaa | 2023-05-04 13:57:45 +0200 | [diff] [blame] | 6614 | assert_bdrv_graph_readable(); |
| 6615 | |
Emanuele Giuseppe Esposito | c834dc0 | 2023-01-13 21:42:11 +0100 | [diff] [blame] | 6616 | if (!bs || !bs->drv || !bs->drv->bdrv_co_debug_event) { |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 6617 | return; |
| 6618 | } |
| 6619 | |
Emanuele Giuseppe Esposito | c834dc0 | 2023-01-13 21:42:11 +0100 | [diff] [blame] | 6620 | bs->drv->bdrv_co_debug_event(bs, event); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6621 | } |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 6622 | |
Kevin Wolf | c0fc512 | 2023-09-29 16:51:46 +0200 | [diff] [blame] | 6623 | static BlockDriverState * GRAPH_RDLOCK |
| 6624 | bdrv_find_debug_node(BlockDriverState *bs) |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6625 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 6626 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6627 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { |
Max Reitz | f706a92 | 2019-06-12 17:42:13 +0200 | [diff] [blame] | 6628 | bs = bdrv_primary_bs(bs); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6629 | } |
| 6630 | |
| 6631 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { |
Vladimir Sementsov-Ogievskiy | d10529a | 2019-09-20 17:20:49 +0300 | [diff] [blame] | 6632 | assert(bs->drv->bdrv_debug_remove_breakpoint); |
| 6633 | return bs; |
| 6634 | } |
| 6635 | |
| 6636 | return NULL; |
| 6637 | } |
| 6638 | |
| 6639 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
| 6640 | const char *tag) |
| 6641 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6642 | GLOBAL_STATE_CODE(); |
Kevin Wolf | c0fc512 | 2023-09-29 16:51:46 +0200 | [diff] [blame] | 6643 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 6644 | |
Vladimir Sementsov-Ogievskiy | d10529a | 2019-09-20 17:20:49 +0300 | [diff] [blame] | 6645 | bs = bdrv_find_debug_node(bs); |
| 6646 | if (bs) { |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6647 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); |
| 6648 | } |
| 6649 | |
| 6650 | return -ENOTSUP; |
| 6651 | } |
| 6652 | |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 6653 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
| 6654 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6655 | GLOBAL_STATE_CODE(); |
Kevin Wolf | c0fc512 | 2023-09-29 16:51:46 +0200 | [diff] [blame] | 6656 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 6657 | |
Vladimir Sementsov-Ogievskiy | d10529a | 2019-09-20 17:20:49 +0300 | [diff] [blame] | 6658 | bs = bdrv_find_debug_node(bs); |
| 6659 | if (bs) { |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 6660 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); |
| 6661 | } |
| 6662 | |
| 6663 | return -ENOTSUP; |
| 6664 | } |
| 6665 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6666 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
| 6667 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6668 | GLOBAL_STATE_CODE(); |
Kevin Wolf | c0fc512 | 2023-09-29 16:51:46 +0200 | [diff] [blame] | 6669 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 6670 | |
Max Reitz | 938789e | 2014-03-10 23:44:08 +0100 | [diff] [blame] | 6671 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
Max Reitz | f706a92 | 2019-06-12 17:42:13 +0200 | [diff] [blame] | 6672 | bs = bdrv_primary_bs(bs); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6673 | } |
| 6674 | |
| 6675 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
| 6676 | return bs->drv->bdrv_debug_resume(bs, tag); |
| 6677 | } |
| 6678 | |
| 6679 | return -ENOTSUP; |
| 6680 | } |
| 6681 | |
| 6682 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) |
| 6683 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6684 | GLOBAL_STATE_CODE(); |
Kevin Wolf | c0fc512 | 2023-09-29 16:51:46 +0200 | [diff] [blame] | 6685 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 6686 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6687 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { |
Max Reitz | f706a92 | 2019-06-12 17:42:13 +0200 | [diff] [blame] | 6688 | bs = bdrv_primary_bs(bs); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6689 | } |
| 6690 | |
| 6691 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { |
| 6692 | return bs->drv->bdrv_debug_is_suspended(bs, tag); |
| 6693 | } |
| 6694 | |
| 6695 | return false; |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 6696 | } |
| 6697 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6698 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
| 6699 | * relative, it must be relative to the chain. So, passing in bs->filename |
| 6700 | * from a BDS as backing_file should not be done, as that may be relative to |
| 6701 | * the CWD rather than the chain. */ |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6702 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
| 6703 | const char *backing_file) |
| 6704 | { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6705 | char *filename_full = NULL; |
| 6706 | char *backing_file_full = NULL; |
| 6707 | char *filename_tmp = NULL; |
| 6708 | int is_protocol = 0; |
Max Reitz | 0b877d0 | 2018-08-01 20:34:11 +0200 | [diff] [blame] | 6709 | bool filenames_refreshed = false; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6710 | BlockDriverState *curr_bs = NULL; |
| 6711 | BlockDriverState *retval = NULL; |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6712 | BlockDriverState *bs_below; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6713 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6714 | GLOBAL_STATE_CODE(); |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 6715 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6716 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6717 | if (!bs || !bs->drv || !backing_file) { |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6718 | return NULL; |
| 6719 | } |
| 6720 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6721 | filename_full = g_malloc(PATH_MAX); |
| 6722 | backing_file_full = g_malloc(PATH_MAX); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6723 | |
| 6724 | is_protocol = path_has_protocol(backing_file); |
| 6725 | |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6726 | /* |
| 6727 | * Being largely a legacy function, skip any filters here |
| 6728 | * (because filters do not have normal filenames, so they cannot |
| 6729 | * match anyway; and allowing json:{} filenames is a bit out of |
| 6730 | * scope). |
| 6731 | */ |
| 6732 | for (curr_bs = bdrv_skip_filters(bs); |
| 6733 | bdrv_cow_child(curr_bs) != NULL; |
| 6734 | curr_bs = bs_below) |
| 6735 | { |
| 6736 | bs_below = bdrv_backing_chain_next(curr_bs); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6737 | |
Max Reitz | 0b877d0 | 2018-08-01 20:34:11 +0200 | [diff] [blame] | 6738 | if (bdrv_backing_overridden(curr_bs)) { |
| 6739 | /* |
| 6740 | * If the backing file was overridden, we can only compare |
| 6741 | * directly against the backing node's filename. |
| 6742 | */ |
| 6743 | |
| 6744 | if (!filenames_refreshed) { |
| 6745 | /* |
| 6746 | * This will automatically refresh all of the |
| 6747 | * filenames in the rest of the backing chain, so we |
| 6748 | * only need to do this once. |
| 6749 | */ |
| 6750 | bdrv_refresh_filename(bs_below); |
| 6751 | filenames_refreshed = true; |
| 6752 | } |
| 6753 | |
| 6754 | if (strcmp(backing_file, bs_below->filename) == 0) { |
| 6755 | retval = bs_below; |
| 6756 | break; |
| 6757 | } |
| 6758 | } else if (is_protocol || path_has_protocol(curr_bs->backing_file)) { |
| 6759 | /* |
| 6760 | * If either of the filename paths is actually a protocol, then |
| 6761 | * compare unmodified paths; otherwise make paths relative. |
| 6762 | */ |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 6763 | char *backing_file_full_ret; |
| 6764 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6765 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6766 | retval = bs_below; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6767 | break; |
| 6768 | } |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 6769 | /* Also check against the full backing filename for the image */ |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 6770 | backing_file_full_ret = bdrv_get_full_backing_filename(curr_bs, |
| 6771 | NULL); |
| 6772 | if (backing_file_full_ret) { |
| 6773 | bool equal = strcmp(backing_file, backing_file_full_ret) == 0; |
| 6774 | g_free(backing_file_full_ret); |
| 6775 | if (equal) { |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6776 | retval = bs_below; |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 6777 | break; |
| 6778 | } |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 6779 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6780 | } else { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6781 | /* If not an absolute filename path, make it relative to the current |
| 6782 | * image's filename path */ |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 6783 | filename_tmp = bdrv_make_absolute_filename(curr_bs, backing_file, |
| 6784 | NULL); |
| 6785 | /* We are going to compare canonicalized absolute pathnames */ |
| 6786 | if (!filename_tmp || !realpath(filename_tmp, filename_full)) { |
| 6787 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6788 | continue; |
| 6789 | } |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 6790 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6791 | |
| 6792 | /* We need to make sure the backing filename we are comparing against |
| 6793 | * is relative to the current image filename (or absolute) */ |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 6794 | filename_tmp = bdrv_get_full_backing_filename(curr_bs, NULL); |
| 6795 | if (!filename_tmp || !realpath(filename_tmp, backing_file_full)) { |
| 6796 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6797 | continue; |
| 6798 | } |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 6799 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6800 | |
| 6801 | if (strcmp(backing_file_full, filename_full) == 0) { |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6802 | retval = bs_below; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6803 | break; |
| 6804 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6805 | } |
| 6806 | } |
| 6807 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6808 | g_free(filename_full); |
| 6809 | g_free(backing_file_full); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6810 | return retval; |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6811 | } |
| 6812 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6813 | void bdrv_init(void) |
| 6814 | { |
Kevin Wolf | e5f05f8 | 2021-07-09 18:41:41 +0200 | [diff] [blame] | 6815 | #ifdef CONFIG_BDRV_WHITELIST_TOOLS |
| 6816 | use_bdrv_whitelist = 1; |
| 6817 | #endif |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 6818 | module_call_init(MODULE_INIT_BLOCK); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6819 | } |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 6820 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 6821 | void bdrv_init_with_whitelist(void) |
| 6822 | { |
| 6823 | use_bdrv_whitelist = 1; |
| 6824 | bdrv_init(); |
| 6825 | } |
| 6826 | |
Emanuele Giuseppe Esposito | a94750d | 2022-02-09 05:54:50 -0500 | [diff] [blame] | 6827 | int bdrv_activate(BlockDriverState *bs, Error **errp) |
| 6828 | { |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6829 | BdrvChild *child, *parent; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6830 | Error *local_err = NULL; |
| 6831 | int ret; |
Vladimir Sementsov-Ogievskiy | 9c98f14 | 2018-10-29 16:23:17 -0400 | [diff] [blame] | 6832 | BdrvDirtyBitmap *bm; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6833 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6834 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 6835 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6836 | |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 6837 | if (!bs->drv) { |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6838 | return -ENOMEDIUM; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6839 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 6840 | |
Vladimir Sementsov-Ogievskiy | 16e977d | 2017-01-31 14:23:08 +0300 | [diff] [blame] | 6841 | QLIST_FOREACH(child, &bs->children, next) { |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6842 | bdrv_activate(child->bs, &local_err); |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6843 | if (local_err) { |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6844 | error_propagate(errp, local_err); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6845 | return -EINVAL; |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6846 | } |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6847 | } |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6848 | |
Kevin Wolf | dafe096 | 2017-11-16 13:00:01 +0100 | [diff] [blame] | 6849 | /* |
| 6850 | * Update permissions, they may differ for inactive nodes. |
| 6851 | * |
| 6852 | * Note that the required permissions of inactive images are always a |
| 6853 | * subset of the permissions required after activating the image. This |
| 6854 | * allows us to just get the permissions upfront without restricting |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6855 | * bdrv_co_invalidate_cache(). |
Kevin Wolf | dafe096 | 2017-11-16 13:00:01 +0100 | [diff] [blame] | 6856 | * |
| 6857 | * It also means that in error cases, we don't have to try and revert to |
| 6858 | * the old permissions (which is an operation that could fail, too). We can |
| 6859 | * just keep the extended permissions for the next time that an activation |
| 6860 | * of the image is tried. |
| 6861 | */ |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6862 | if (bs->open_flags & BDRV_O_INACTIVE) { |
| 6863 | bs->open_flags &= ~BDRV_O_INACTIVE; |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 6864 | ret = bdrv_refresh_perms(bs, NULL, errp); |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6865 | if (ret < 0) { |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6866 | bs->open_flags |= BDRV_O_INACTIVE; |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6867 | return ret; |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6868 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 6869 | |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6870 | ret = bdrv_invalidate_cache(bs, errp); |
| 6871 | if (ret < 0) { |
| 6872 | bs->open_flags |= BDRV_O_INACTIVE; |
| 6873 | return ret; |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6874 | } |
Vladimir Sementsov-Ogievskiy | 9c98f14 | 2018-10-29 16:23:17 -0400 | [diff] [blame] | 6875 | |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6876 | FOR_EACH_DIRTY_BITMAP(bs, bm) { |
| 6877 | bdrv_dirty_bitmap_skip_store(bm, false); |
| 6878 | } |
| 6879 | |
Emanuele Giuseppe Esposito | c057960 | 2023-01-13 21:42:03 +0100 | [diff] [blame] | 6880 | ret = bdrv_refresh_total_sectors(bs, bs->total_sectors); |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6881 | if (ret < 0) { |
| 6882 | bs->open_flags |= BDRV_O_INACTIVE; |
| 6883 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6884 | return ret; |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6885 | } |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6886 | } |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6887 | |
| 6888 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 6889 | if (parent->klass->activate) { |
| 6890 | parent->klass->activate(parent, &local_err); |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6891 | if (local_err) { |
Kevin Wolf | 78fc3b3 | 2019-01-31 15:16:10 +0100 | [diff] [blame] | 6892 | bs->open_flags |= BDRV_O_INACTIVE; |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6893 | error_propagate(errp, local_err); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6894 | return -EINVAL; |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6895 | } |
| 6896 | } |
| 6897 | } |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6898 | |
| 6899 | return 0; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6900 | } |
| 6901 | |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6902 | int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp) |
| 6903 | { |
| 6904 | Error *local_err = NULL; |
Emanuele Giuseppe Esposito | 1581a70 | 2022-03-03 10:16:09 -0500 | [diff] [blame] | 6905 | IO_CODE(); |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6906 | |
| 6907 | assert(!(bs->open_flags & BDRV_O_INACTIVE)); |
Kevin Wolf | 1b3ff9f | 2022-12-07 14:18:38 +0100 | [diff] [blame] | 6908 | assert_bdrv_graph_readable(); |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6909 | |
| 6910 | if (bs->drv->bdrv_co_invalidate_cache) { |
| 6911 | bs->drv->bdrv_co_invalidate_cache(bs, &local_err); |
| 6912 | if (local_err) { |
| 6913 | error_propagate(errp, local_err); |
| 6914 | return -EINVAL; |
| 6915 | } |
| 6916 | } |
| 6917 | |
| 6918 | return 0; |
| 6919 | } |
| 6920 | |
Emanuele Giuseppe Esposito | 3b71719 | 2022-02-09 05:54:51 -0500 | [diff] [blame] | 6921 | void bdrv_activate_all(Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6922 | { |
Kevin Wolf | 7c8eece | 2016-03-22 18:58:50 +0100 | [diff] [blame] | 6923 | BlockDriverState *bs; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 6924 | BdrvNextIterator it; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6925 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6926 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 2b3912f | 2023-09-29 16:51:39 +0200 | [diff] [blame] | 6927 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6928 | |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 6929 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6930 | int ret; |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 6931 | |
Emanuele Giuseppe Esposito | a94750d | 2022-02-09 05:54:50 -0500 | [diff] [blame] | 6932 | ret = bdrv_activate(bs, errp); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6933 | if (ret < 0) { |
Max Reitz | 5e003f1 | 2017-11-10 18:25:45 +0100 | [diff] [blame] | 6934 | bdrv_next_cleanup(&it); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6935 | return; |
| 6936 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6937 | } |
| 6938 | } |
| 6939 | |
Kevin Wolf | 0e6bad1 | 2023-09-29 16:51:38 +0200 | [diff] [blame] | 6940 | static bool GRAPH_RDLOCK |
| 6941 | bdrv_has_bds_parent(BlockDriverState *bs, bool only_active) |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6942 | { |
| 6943 | BdrvChild *parent; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 6944 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6945 | |
| 6946 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 6947 | if (parent->klass->parent_is_bds) { |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6948 | BlockDriverState *parent_bs = parent->opaque; |
| 6949 | if (!only_active || !(parent_bs->open_flags & BDRV_O_INACTIVE)) { |
| 6950 | return true; |
| 6951 | } |
| 6952 | } |
| 6953 | } |
| 6954 | |
| 6955 | return false; |
| 6956 | } |
| 6957 | |
Kevin Wolf | 0e6bad1 | 2023-09-29 16:51:38 +0200 | [diff] [blame] | 6958 | static int GRAPH_RDLOCK bdrv_inactivate_recurse(BlockDriverState *bs) |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6959 | { |
Kevin Wolf | cfa1a57 | 2017-05-04 18:52:38 +0200 | [diff] [blame] | 6960 | BdrvChild *child, *parent; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6961 | int ret; |
Vladimir Sementsov-Ogievskiy | a13de40 | 2021-09-11 15:00:27 +0300 | [diff] [blame] | 6962 | uint64_t cumulative_perms, cumulative_shared_perms; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6963 | |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 6964 | GLOBAL_STATE_CODE(); |
| 6965 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 6966 | if (!bs->drv) { |
| 6967 | return -ENOMEDIUM; |
| 6968 | } |
| 6969 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6970 | /* Make sure that we don't inactivate a child before its parent. |
| 6971 | * It will be covered by recursion from the yet active parent. */ |
| 6972 | if (bdrv_has_bds_parent(bs, true)) { |
| 6973 | return 0; |
| 6974 | } |
| 6975 | |
| 6976 | assert(!(bs->open_flags & BDRV_O_INACTIVE)); |
| 6977 | |
| 6978 | /* Inactivate this node */ |
| 6979 | if (bs->drv->bdrv_inactivate) { |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6980 | ret = bs->drv->bdrv_inactivate(bs); |
| 6981 | if (ret < 0) { |
| 6982 | return ret; |
| 6983 | } |
| 6984 | } |
| 6985 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6986 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 6987 | if (parent->klass->inactivate) { |
| 6988 | ret = parent->klass->inactivate(parent); |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6989 | if (ret < 0) { |
| 6990 | return ret; |
Kevin Wolf | cfa1a57 | 2017-05-04 18:52:38 +0200 | [diff] [blame] | 6991 | } |
| 6992 | } |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 6993 | } |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 6994 | |
Vladimir Sementsov-Ogievskiy | a13de40 | 2021-09-11 15:00:27 +0300 | [diff] [blame] | 6995 | bdrv_get_cumulative_perm(bs, &cumulative_perms, |
| 6996 | &cumulative_shared_perms); |
| 6997 | if (cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) { |
| 6998 | /* Our inactive parents still need write access. Inactivation failed. */ |
| 6999 | return -EPERM; |
| 7000 | } |
| 7001 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 7002 | bs->open_flags |= BDRV_O_INACTIVE; |
| 7003 | |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 7004 | /* |
| 7005 | * Update permissions, they may differ for inactive nodes. |
| 7006 | * We only tried to loosen restrictions, so errors are not fatal, ignore |
| 7007 | * them. |
| 7008 | */ |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 7009 | bdrv_refresh_perms(bs, NULL, NULL); |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 7010 | |
| 7011 | /* Recursively inactivate children */ |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 7012 | QLIST_FOREACH(child, &bs->children, next) { |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 7013 | ret = bdrv_inactivate_recurse(child->bs); |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 7014 | if (ret < 0) { |
| 7015 | return ret; |
| 7016 | } |
| 7017 | } |
| 7018 | |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 7019 | return 0; |
| 7020 | } |
| 7021 | |
| 7022 | int bdrv_inactivate_all(void) |
| 7023 | { |
Max Reitz | 79720af | 2016-03-16 19:54:44 +0100 | [diff] [blame] | 7024 | BlockDriverState *bs = NULL; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 7025 | BdrvNextIterator it; |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 7026 | int ret = 0; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 7027 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7028 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 0e6bad1 | 2023-09-29 16:51:38 +0200 | [diff] [blame] | 7029 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7030 | |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 7031 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 7032 | /* Nodes with BDS parents are covered by recursion from the last |
| 7033 | * parent that gets inactivated. Don't inactivate them a second |
| 7034 | * time if that has already happened. */ |
| 7035 | if (bdrv_has_bds_parent(bs, false)) { |
| 7036 | continue; |
| 7037 | } |
| 7038 | ret = bdrv_inactivate_recurse(bs); |
| 7039 | if (ret < 0) { |
| 7040 | bdrv_next_cleanup(&it); |
Stefan Hajnoczi | b49f475 | 2023-12-05 13:20:03 -0500 | [diff] [blame] | 7041 | break; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 7042 | } |
| 7043 | } |
| 7044 | |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 7045 | return ret; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 7046 | } |
| 7047 | |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 7048 | /**************************************************************/ |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7049 | /* removable device support */ |
| 7050 | |
| 7051 | /** |
| 7052 | * Return TRUE if the media is present |
| 7053 | */ |
Emanuele Giuseppe Esposito | 1e97be9 | 2023-01-13 21:42:02 +0100 | [diff] [blame] | 7054 | bool coroutine_fn bdrv_co_is_inserted(BlockDriverState *bs) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7055 | { |
| 7056 | BlockDriver *drv = bs->drv; |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 7057 | BdrvChild *child; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7058 | IO_CODE(); |
Emanuele Giuseppe Esposito | c73ff92 | 2023-02-03 16:21:57 +0100 | [diff] [blame] | 7059 | assert_bdrv_graph_readable(); |
Markus Armbruster | a1aff5b | 2011-09-06 18:58:41 +0200 | [diff] [blame] | 7060 | |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 7061 | if (!drv) { |
| 7062 | return false; |
| 7063 | } |
Emanuele Giuseppe Esposito | 1e97be9 | 2023-01-13 21:42:02 +0100 | [diff] [blame] | 7064 | if (drv->bdrv_co_is_inserted) { |
| 7065 | return drv->bdrv_co_is_inserted(bs); |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 7066 | } |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 7067 | QLIST_FOREACH(child, &bs->children, next) { |
Emanuele Giuseppe Esposito | 1e97be9 | 2023-01-13 21:42:02 +0100 | [diff] [blame] | 7068 | if (!bdrv_co_is_inserted(child->bs)) { |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 7069 | return false; |
| 7070 | } |
| 7071 | } |
| 7072 | return true; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7073 | } |
| 7074 | |
| 7075 | /** |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7076 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray |
| 7077 | */ |
Emanuele Giuseppe Esposito | 2531b39 | 2023-01-13 21:42:09 +0100 | [diff] [blame] | 7078 | void coroutine_fn bdrv_co_eject(BlockDriverState *bs, bool eject_flag) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7079 | { |
| 7080 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7081 | IO_CODE(); |
Kevin Wolf | 79a292e | 2023-02-03 16:21:58 +0100 | [diff] [blame] | 7082 | assert_bdrv_graph_readable(); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7083 | |
Emanuele Giuseppe Esposito | 2531b39 | 2023-01-13 21:42:09 +0100 | [diff] [blame] | 7084 | if (drv && drv->bdrv_co_eject) { |
| 7085 | drv->bdrv_co_eject(bs, eject_flag); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7086 | } |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7087 | } |
| 7088 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7089 | /** |
| 7090 | * Lock or unlock the media (if it is locked, the user won't be able |
| 7091 | * to eject it manually). |
| 7092 | */ |
Emanuele Giuseppe Esposito | 2c75261 | 2023-01-13 21:42:10 +0100 | [diff] [blame] | 7093 | void coroutine_fn bdrv_co_lock_medium(BlockDriverState *bs, bool locked) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7094 | { |
| 7095 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7096 | IO_CODE(); |
Kevin Wolf | 79a292e | 2023-02-03 16:21:58 +0100 | [diff] [blame] | 7097 | assert_bdrv_graph_readable(); |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 7098 | trace_bdrv_lock_medium(bs, locked); |
Stefan Hajnoczi | b8c6d09 | 2011-03-29 20:04:40 +0100 | [diff] [blame] | 7099 | |
Emanuele Giuseppe Esposito | 2c75261 | 2023-01-13 21:42:10 +0100 | [diff] [blame] | 7100 | if (drv && drv->bdrv_co_lock_medium) { |
| 7101 | drv->bdrv_co_lock_medium(bs, locked); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7102 | } |
| 7103 | } |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 7104 | |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 7105 | /* Get a reference to bs */ |
| 7106 | void bdrv_ref(BlockDriverState *bs) |
| 7107 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7108 | GLOBAL_STATE_CODE(); |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 7109 | bs->refcnt++; |
| 7110 | } |
| 7111 | |
| 7112 | /* Release a previously grabbed reference to bs. |
| 7113 | * If after releasing, reference count is zero, the BlockDriverState is |
| 7114 | * deleted. */ |
| 7115 | void bdrv_unref(BlockDriverState *bs) |
| 7116 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7117 | GLOBAL_STATE_CODE(); |
Jeff Cody | 9a4d5ca | 2014-07-23 17:22:57 -0400 | [diff] [blame] | 7118 | if (!bs) { |
| 7119 | return; |
| 7120 | } |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 7121 | assert(bs->refcnt > 0); |
| 7122 | if (--bs->refcnt == 0) { |
| 7123 | bdrv_delete(bs); |
| 7124 | } |
| 7125 | } |
| 7126 | |
Kevin Wolf | 6bc0bcc | 2023-11-15 18:20:10 +0100 | [diff] [blame] | 7127 | static void bdrv_schedule_unref_bh(void *opaque) |
| 7128 | { |
| 7129 | BlockDriverState *bs = opaque; |
Kevin Wolf | 6bc0bcc | 2023-11-15 18:20:10 +0100 | [diff] [blame] | 7130 | |
Kevin Wolf | 6bc0bcc | 2023-11-15 18:20:10 +0100 | [diff] [blame] | 7131 | bdrv_unref(bs); |
Kevin Wolf | 6bc0bcc | 2023-11-15 18:20:10 +0100 | [diff] [blame] | 7132 | } |
| 7133 | |
Kevin Wolf | ac2ae23 | 2023-09-11 11:46:04 +0200 | [diff] [blame] | 7134 | /* |
| 7135 | * Release a BlockDriverState reference while holding the graph write lock. |
| 7136 | * |
| 7137 | * Calling bdrv_unref() directly is forbidden while holding the graph lock |
| 7138 | * because bdrv_close() both involves polling and taking the graph lock |
| 7139 | * internally. bdrv_schedule_unref() instead delays decreasing the refcount and |
| 7140 | * possibly closing @bs until the graph lock is released. |
| 7141 | */ |
| 7142 | void bdrv_schedule_unref(BlockDriverState *bs) |
| 7143 | { |
| 7144 | if (!bs) { |
| 7145 | return; |
| 7146 | } |
Kevin Wolf | 6bc0bcc | 2023-11-15 18:20:10 +0100 | [diff] [blame] | 7147 | aio_bh_schedule_oneshot(qemu_get_aio_context(), bdrv_schedule_unref_bh, bs); |
Kevin Wolf | ac2ae23 | 2023-09-11 11:46:04 +0200 | [diff] [blame] | 7148 | } |
| 7149 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7150 | struct BdrvOpBlocker { |
| 7151 | Error *reason; |
| 7152 | QLIST_ENTRY(BdrvOpBlocker) list; |
| 7153 | }; |
| 7154 | |
| 7155 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) |
| 7156 | { |
| 7157 | BdrvOpBlocker *blocker; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7158 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 0bb79c9 | 2023-09-29 16:51:49 +0200 | [diff] [blame] | 7159 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7160 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 7161 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { |
| 7162 | blocker = QLIST_FIRST(&bs->op_blockers[op]); |
Markus Armbruster | 4b57664 | 2018-10-17 10:26:25 +0200 | [diff] [blame] | 7163 | error_propagate_prepend(errp, error_copy(blocker->reason), |
| 7164 | "Node '%s' is busy: ", |
| 7165 | bdrv_get_device_or_node_name(bs)); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7166 | return true; |
| 7167 | } |
| 7168 | return false; |
| 7169 | } |
| 7170 | |
| 7171 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 7172 | { |
| 7173 | BdrvOpBlocker *blocker; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7174 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7175 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 7176 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 7177 | blocker = g_new0(BdrvOpBlocker, 1); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7178 | blocker->reason = reason; |
| 7179 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); |
| 7180 | } |
| 7181 | |
| 7182 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 7183 | { |
| 7184 | BdrvOpBlocker *blocker, *next; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7185 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7186 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 7187 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { |
| 7188 | if (blocker->reason == reason) { |
| 7189 | QLIST_REMOVE(blocker, list); |
| 7190 | g_free(blocker); |
| 7191 | } |
| 7192 | } |
| 7193 | } |
| 7194 | |
| 7195 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) |
| 7196 | { |
| 7197 | int i; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7198 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7199 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 7200 | bdrv_op_block(bs, i, reason); |
| 7201 | } |
| 7202 | } |
| 7203 | |
| 7204 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) |
| 7205 | { |
| 7206 | int i; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7207 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7208 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 7209 | bdrv_op_unblock(bs, i, reason); |
| 7210 | } |
| 7211 | } |
| 7212 | |
| 7213 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) |
| 7214 | { |
| 7215 | int i; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7216 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7217 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 7218 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { |
| 7219 | return false; |
| 7220 | } |
| 7221 | } |
| 7222 | return true; |
| 7223 | } |
| 7224 | |
Kevin Wolf | e135505 | 2022-12-07 14:18:30 +0100 | [diff] [blame] | 7225 | /* |
| 7226 | * Must not be called while holding the lock of an AioContext other than the |
| 7227 | * current one. |
| 7228 | */ |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 7229 | void bdrv_img_create(const char *filename, const char *fmt, |
| 7230 | const char *base_filename, const char *base_fmt, |
Fam Zheng | 9217283 | 2017-04-21 20:27:01 +0800 | [diff] [blame] | 7231 | char *options, uint64_t img_size, int flags, bool quiet, |
| 7232 | Error **errp) |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7233 | { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7234 | QemuOptsList *create_opts = NULL; |
| 7235 | QemuOpts *opts = NULL; |
| 7236 | const char *backing_fmt, *backing_file; |
| 7237 | int64_t size; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7238 | BlockDriver *drv, *proto_drv; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 7239 | Error *local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7240 | int ret = 0; |
| 7241 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7242 | GLOBAL_STATE_CODE(); |
| 7243 | |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7244 | /* Find driver and parse its options */ |
| 7245 | drv = bdrv_find_format(fmt); |
| 7246 | if (!drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 7247 | error_setg(errp, "Unknown file format '%s'", fmt); |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 7248 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7249 | } |
| 7250 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 7251 | proto_drv = bdrv_find_protocol(filename, true, errp); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7252 | if (!proto_drv) { |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 7253 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7254 | } |
| 7255 | |
Max Reitz | c614972 | 2014-12-02 18:32:45 +0100 | [diff] [blame] | 7256 | if (!drv->create_opts) { |
| 7257 | error_setg(errp, "Format driver '%s' does not support image creation", |
| 7258 | drv->format_name); |
| 7259 | return; |
| 7260 | } |
| 7261 | |
Maxim Levitsky | 5a5e7f8 | 2020-03-26 03:12:18 +0200 | [diff] [blame] | 7262 | if (!proto_drv->create_opts) { |
| 7263 | error_setg(errp, "Protocol driver '%s' does not support image creation", |
| 7264 | proto_drv->format_name); |
| 7265 | return; |
| 7266 | } |
| 7267 | |
Kevin Wolf | f6dc1c3 | 2019-11-26 16:45:49 +0100 | [diff] [blame] | 7268 | /* Create parameter list */ |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 7269 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
Maxim Levitsky | 5a5e7f8 | 2020-03-26 03:12:18 +0200 | [diff] [blame] | 7270 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7271 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7272 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7273 | |
| 7274 | /* Parse -o options */ |
| 7275 | if (options) { |
Markus Armbruster | a5f9b9d | 2020-07-07 18:06:05 +0200 | [diff] [blame] | 7276 | if (!qemu_opts_do_parse(opts, options, NULL, errp)) { |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7277 | goto out; |
| 7278 | } |
| 7279 | } |
| 7280 | |
Kevin Wolf | f6dc1c3 | 2019-11-26 16:45:49 +0100 | [diff] [blame] | 7281 | if (!qemu_opt_get(opts, BLOCK_OPT_SIZE)) { |
| 7282 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size, &error_abort); |
| 7283 | } else if (img_size != UINT64_C(-1)) { |
| 7284 | error_setg(errp, "The image size must be specified only once"); |
| 7285 | goto out; |
| 7286 | } |
| 7287 | |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7288 | if (base_filename) { |
Markus Armbruster | 235e59c | 2020-07-07 18:05:42 +0200 | [diff] [blame] | 7289 | if (!qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, |
Markus Armbruster | 3882578 | 2020-07-07 18:05:43 +0200 | [diff] [blame] | 7290 | NULL)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 7291 | error_setg(errp, "Backing file not supported for file format '%s'", |
| 7292 | fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7293 | goto out; |
| 7294 | } |
| 7295 | } |
| 7296 | |
| 7297 | if (base_fmt) { |
Markus Armbruster | 3882578 | 2020-07-07 18:05:43 +0200 | [diff] [blame] | 7298 | if (!qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, NULL)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 7299 | error_setg(errp, "Backing file format not supported for file " |
| 7300 | "format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7301 | goto out; |
| 7302 | } |
| 7303 | } |
| 7304 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7305 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
| 7306 | if (backing_file) { |
| 7307 | if (!strcmp(filename, backing_file)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 7308 | error_setg(errp, "Error: Trying to create an image with the " |
| 7309 | "same filename as the backing file"); |
Jes Sorensen | 792da93 | 2010-12-16 13:52:17 +0100 | [diff] [blame] | 7310 | goto out; |
| 7311 | } |
Connor Kuehl | 975a7bd | 2020-08-13 08:47:22 -0500 | [diff] [blame] | 7312 | if (backing_file[0] == '\0') { |
| 7313 | error_setg(errp, "Expected backing file name, got empty string"); |
| 7314 | goto out; |
| 7315 | } |
Jes Sorensen | 792da93 | 2010-12-16 13:52:17 +0100 | [diff] [blame] | 7316 | } |
| 7317 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7318 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7319 | |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7320 | /* The size for the image must always be specified, unless we have a backing |
| 7321 | * file and we have not been forbidden from opening it. */ |
Eric Blake | a8b42a1 | 2017-09-25 09:55:07 -0500 | [diff] [blame] | 7322 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, img_size); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7323 | if (backing_file && !(flags & BDRV_O_NO_BACKING)) { |
| 7324 | BlockDriverState *bs; |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 7325 | char *full_backing; |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7326 | int back_flags; |
| 7327 | QDict *backing_options = NULL; |
Paolo Bonzini | 63090da | 2012-04-12 14:01:03 +0200 | [diff] [blame] | 7328 | |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 7329 | full_backing = |
| 7330 | bdrv_get_full_backing_filename_from_filename(filename, backing_file, |
| 7331 | &local_err); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7332 | if (local_err) { |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7333 | goto out; |
| 7334 | } |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 7335 | assert(full_backing); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7336 | |
Max Reitz | d5b2399 | 2021-06-22 16:00:30 +0200 | [diff] [blame] | 7337 | /* |
| 7338 | * No need to do I/O here, which allows us to open encrypted |
| 7339 | * backing images without needing the secret |
| 7340 | */ |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7341 | back_flags = flags; |
| 7342 | back_flags &= ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
Max Reitz | d5b2399 | 2021-06-22 16:00:30 +0200 | [diff] [blame] | 7343 | back_flags |= BDRV_O_NO_IO; |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7344 | |
Fam Zheng | cc954f0 | 2017-12-15 16:04:45 +0800 | [diff] [blame] | 7345 | backing_options = qdict_new(); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7346 | if (backing_fmt) { |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7347 | qdict_put_str(backing_options, "driver", backing_fmt); |
| 7348 | } |
Fam Zheng | cc954f0 | 2017-12-15 16:04:45 +0800 | [diff] [blame] | 7349 | qdict_put_bool(backing_options, BDRV_OPT_FORCE_SHARE, true); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7350 | |
| 7351 | bs = bdrv_open(full_backing, NULL, backing_options, back_flags, |
| 7352 | &local_err); |
| 7353 | g_free(full_backing); |
Eric Blake | add8200 | 2020-07-06 15:39:50 -0500 | [diff] [blame] | 7354 | if (!bs) { |
| 7355 | error_append_hint(&local_err, "Could not open backing image.\n"); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7356 | goto out; |
| 7357 | } else { |
Eric Blake | d9f059a | 2020-07-06 15:39:54 -0500 | [diff] [blame] | 7358 | if (!backing_fmt) { |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 7359 | error_setg(&local_err, |
| 7360 | "Backing file specified without backing format"); |
Michael Tokarev | fbdffb0 | 2023-04-05 16:34:04 +0300 | [diff] [blame] | 7361 | error_append_hint(&local_err, "Detected format of %s.\n", |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 7362 | bs->drv->format_name); |
| 7363 | goto out; |
Eric Blake | d9f059a | 2020-07-06 15:39:54 -0500 | [diff] [blame] | 7364 | } |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7365 | if (size == -1) { |
| 7366 | /* Opened BS, have no size */ |
| 7367 | size = bdrv_getlength(bs); |
| 7368 | if (size < 0) { |
| 7369 | error_setg_errno(errp, -size, "Could not get size of '%s'", |
| 7370 | backing_file); |
| 7371 | bdrv_unref(bs); |
| 7372 | goto out; |
| 7373 | } |
| 7374 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort); |
| 7375 | } |
| 7376 | bdrv_unref(bs); |
| 7377 | } |
Eric Blake | d9f059a | 2020-07-06 15:39:54 -0500 | [diff] [blame] | 7378 | /* (backing_file && !(flags & BDRV_O_NO_BACKING)) */ |
| 7379 | } else if (backing_file && !backing_fmt) { |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 7380 | error_setg(&local_err, |
| 7381 | "Backing file specified without backing format"); |
| 7382 | goto out; |
Eric Blake | d9f059a | 2020-07-06 15:39:54 -0500 | [diff] [blame] | 7383 | } |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7384 | |
Hyman Huang | 35286da | 2024-01-30 13:37:23 +0800 | [diff] [blame] | 7385 | /* Parameter 'size' is not needed for detached LUKS header */ |
| 7386 | if (size == -1 && |
| 7387 | !(!strcmp(fmt, "luks") && |
| 7388 | qemu_opt_get_bool(opts, "detached-header", false))) { |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7389 | error_setg(errp, "Image creation needs a size parameter"); |
| 7390 | goto out; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7391 | } |
| 7392 | |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 7393 | if (!quiet) { |
Kővágó, Zoltán | fe64669 | 2015-07-07 16:42:10 +0200 | [diff] [blame] | 7394 | printf("Formatting '%s', fmt=%s ", filename, fmt); |
Fam Zheng | 43c5d8f | 2014-12-09 15:38:04 +0800 | [diff] [blame] | 7395 | qemu_opts_print(opts, " "); |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 7396 | puts(""); |
Eric Blake | 4e2f441 | 2020-07-06 15:39:45 -0500 | [diff] [blame] | 7397 | fflush(stdout); |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 7398 | } |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7399 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 7400 | ret = bdrv_create(drv, filename, opts, &local_err); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7401 | |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 7402 | if (ret == -EFBIG) { |
| 7403 | /* This is generally a better message than whatever the driver would |
| 7404 | * deliver (especially because of the cluster_size_hint), since that |
| 7405 | * is most probably not much different from "image too large". */ |
| 7406 | const char *cluster_size_hint = ""; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7407 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 7408 | cluster_size_hint = " (try using a larger cluster size)"; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7409 | } |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 7410 | error_setg(errp, "The image size is too large for file format '%s'" |
| 7411 | "%s", fmt, cluster_size_hint); |
| 7412 | error_free(local_err); |
| 7413 | local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7414 | } |
| 7415 | |
| 7416 | out: |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7417 | qemu_opts_del(opts); |
| 7418 | qemu_opts_free(create_opts); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 7419 | error_propagate(errp, local_err); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7420 | } |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 7421 | |
| 7422 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) |
| 7423 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7424 | IO_CODE(); |
Stefan Hajnoczi | 33f2a75 | 2018-02-16 16:50:13 +0000 | [diff] [blame] | 7425 | return bs ? bs->aio_context : qemu_get_aio_context(); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7426 | } |
| 7427 | |
Kevin Wolf | e336fd4 | 2020-10-05 17:58:53 +0200 | [diff] [blame] | 7428 | AioContext *coroutine_fn bdrv_co_enter(BlockDriverState *bs) |
| 7429 | { |
| 7430 | Coroutine *self = qemu_coroutine_self(); |
| 7431 | AioContext *old_ctx = qemu_coroutine_get_aio_context(self); |
| 7432 | AioContext *new_ctx; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7433 | IO_CODE(); |
Kevin Wolf | e336fd4 | 2020-10-05 17:58:53 +0200 | [diff] [blame] | 7434 | |
| 7435 | /* |
| 7436 | * Increase bs->in_flight to ensure that this operation is completed before |
| 7437 | * moving the node to a different AioContext. Read new_ctx only afterwards. |
| 7438 | */ |
| 7439 | bdrv_inc_in_flight(bs); |
| 7440 | |
| 7441 | new_ctx = bdrv_get_aio_context(bs); |
| 7442 | aio_co_reschedule_self(new_ctx); |
| 7443 | return old_ctx; |
| 7444 | } |
| 7445 | |
| 7446 | void coroutine_fn bdrv_co_leave(BlockDriverState *bs, AioContext *old_ctx) |
| 7447 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7448 | IO_CODE(); |
Kevin Wolf | e336fd4 | 2020-10-05 17:58:53 +0200 | [diff] [blame] | 7449 | aio_co_reschedule_self(old_ctx); |
| 7450 | bdrv_dec_in_flight(bs); |
| 7451 | } |
| 7452 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7453 | static void bdrv_do_remove_aio_context_notifier(BdrvAioNotifier *ban) |
| 7454 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 7455 | GLOBAL_STATE_CODE(); |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7456 | QLIST_REMOVE(ban, list); |
| 7457 | g_free(ban); |
| 7458 | } |
| 7459 | |
Kevin Wolf | a3a683c | 2019-05-06 19:17:57 +0200 | [diff] [blame] | 7460 | static void bdrv_detach_aio_context(BlockDriverState *bs) |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7461 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7462 | BdrvAioNotifier *baf, *baf_tmp; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7463 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7464 | assert(!bs->walking_aio_notifiers); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 7465 | GLOBAL_STATE_CODE(); |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7466 | bs->walking_aio_notifiers = true; |
| 7467 | QLIST_FOREACH_SAFE(baf, &bs->aio_notifiers, list, baf_tmp) { |
| 7468 | if (baf->deleted) { |
| 7469 | bdrv_do_remove_aio_context_notifier(baf); |
| 7470 | } else { |
| 7471 | baf->detach_aio_context(baf->opaque); |
| 7472 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7473 | } |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7474 | /* Never mind iterating again to check for ->deleted. bdrv_close() will |
| 7475 | * remove remaining aio notifiers if we aren't called again. |
| 7476 | */ |
| 7477 | bs->walking_aio_notifiers = false; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7478 | |
Kevin Wolf | 1bffe1a | 2019-04-17 17:15:25 +0200 | [diff] [blame] | 7479 | if (bs->drv && bs->drv->bdrv_detach_aio_context) { |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7480 | bs->drv->bdrv_detach_aio_context(bs); |
| 7481 | } |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7482 | |
| 7483 | bs->aio_context = NULL; |
| 7484 | } |
| 7485 | |
Kevin Wolf | a3a683c | 2019-05-06 19:17:57 +0200 | [diff] [blame] | 7486 | static void bdrv_attach_aio_context(BlockDriverState *bs, |
| 7487 | AioContext *new_context) |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7488 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7489 | BdrvAioNotifier *ban, *ban_tmp; |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 7490 | GLOBAL_STATE_CODE(); |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7491 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7492 | bs->aio_context = new_context; |
| 7493 | |
Kevin Wolf | 1bffe1a | 2019-04-17 17:15:25 +0200 | [diff] [blame] | 7494 | if (bs->drv && bs->drv->bdrv_attach_aio_context) { |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7495 | bs->drv->bdrv_attach_aio_context(bs, new_context); |
| 7496 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7497 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7498 | assert(!bs->walking_aio_notifiers); |
| 7499 | bs->walking_aio_notifiers = true; |
| 7500 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_tmp) { |
| 7501 | if (ban->deleted) { |
| 7502 | bdrv_do_remove_aio_context_notifier(ban); |
| 7503 | } else { |
| 7504 | ban->attached_aio_context(new_context, ban->opaque); |
| 7505 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7506 | } |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7507 | bs->walking_aio_notifiers = false; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7508 | } |
| 7509 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7510 | typedef struct BdrvStateSetAioContext { |
| 7511 | AioContext *new_ctx; |
| 7512 | BlockDriverState *bs; |
| 7513 | } BdrvStateSetAioContext; |
| 7514 | |
| 7515 | static bool bdrv_parent_change_aio_context(BdrvChild *c, AioContext *ctx, |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7516 | GHashTable *visited, |
| 7517 | Transaction *tran, |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7518 | Error **errp) |
| 7519 | { |
| 7520 | GLOBAL_STATE_CODE(); |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7521 | if (g_hash_table_contains(visited, c)) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7522 | return true; |
| 7523 | } |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7524 | g_hash_table_add(visited, c); |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7525 | |
| 7526 | /* |
| 7527 | * A BdrvChildClass that doesn't handle AioContext changes cannot |
| 7528 | * tolerate any AioContext changes |
| 7529 | */ |
| 7530 | if (!c->klass->change_aio_ctx) { |
| 7531 | char *user = bdrv_child_user_desc(c); |
| 7532 | error_setg(errp, "Changing iothreads is not supported by %s", user); |
| 7533 | g_free(user); |
| 7534 | return false; |
| 7535 | } |
| 7536 | if (!c->klass->change_aio_ctx(c, ctx, visited, tran, errp)) { |
| 7537 | assert(!errp || *errp); |
| 7538 | return false; |
| 7539 | } |
| 7540 | return true; |
| 7541 | } |
| 7542 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7543 | bool bdrv_child_change_aio_context(BdrvChild *c, AioContext *ctx, |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7544 | GHashTable *visited, Transaction *tran, |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7545 | Error **errp) |
| 7546 | { |
| 7547 | GLOBAL_STATE_CODE(); |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7548 | if (g_hash_table_contains(visited, c)) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7549 | return true; |
| 7550 | } |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7551 | g_hash_table_add(visited, c); |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7552 | return bdrv_change_aio_context(c->bs, ctx, visited, tran, errp); |
| 7553 | } |
| 7554 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7555 | static void bdrv_set_aio_context_clean(void *opaque) |
| 7556 | { |
| 7557 | BdrvStateSetAioContext *state = (BdrvStateSetAioContext *) opaque; |
| 7558 | BlockDriverState *bs = (BlockDriverState *) state->bs; |
| 7559 | |
| 7560 | /* Paired with bdrv_drained_begin in bdrv_change_aio_context() */ |
| 7561 | bdrv_drained_end(bs); |
| 7562 | |
| 7563 | g_free(state); |
| 7564 | } |
| 7565 | |
| 7566 | static void bdrv_set_aio_context_commit(void *opaque) |
| 7567 | { |
| 7568 | BdrvStateSetAioContext *state = (BdrvStateSetAioContext *) opaque; |
| 7569 | BlockDriverState *bs = (BlockDriverState *) state->bs; |
| 7570 | AioContext *new_context = state->new_ctx; |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7571 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7572 | bdrv_detach_aio_context(bs); |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7573 | bdrv_attach_aio_context(bs, new_context); |
| 7574 | } |
| 7575 | |
| 7576 | static TransactionActionDrv set_aio_context = { |
| 7577 | .commit = bdrv_set_aio_context_commit, |
| 7578 | .clean = bdrv_set_aio_context_clean, |
| 7579 | }; |
| 7580 | |
Kevin Wolf | 42a65f0 | 2019-05-07 18:31:38 +0200 | [diff] [blame] | 7581 | /* |
| 7582 | * Changes the AioContext used for fd handlers, timers, and BHs by this |
| 7583 | * BlockDriverState and all its children and parents. |
| 7584 | * |
Max Reitz | 43eaaae | 2019-07-22 15:30:54 +0200 | [diff] [blame] | 7585 | * Must be called from the main AioContext. |
| 7586 | * |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7587 | * @visited will accumulate all visited BdrvChild objects. The caller is |
Kevin Wolf | 42a65f0 | 2019-05-07 18:31:38 +0200 | [diff] [blame] | 7588 | * responsible for freeing the list afterwards. |
| 7589 | */ |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7590 | static bool bdrv_change_aio_context(BlockDriverState *bs, AioContext *ctx, |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7591 | GHashTable *visited, Transaction *tran, |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7592 | Error **errp) |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7593 | { |
| 7594 | BdrvChild *c; |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7595 | BdrvStateSetAioContext *state; |
| 7596 | |
| 7597 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7598 | |
| 7599 | if (bdrv_get_aio_context(bs) == ctx) { |
| 7600 | return true; |
| 7601 | } |
| 7602 | |
Kevin Wolf | 7f831d2 | 2023-09-11 11:46:17 +0200 | [diff] [blame] | 7603 | bdrv_graph_rdlock_main_loop(); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7604 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7605 | if (!bdrv_parent_change_aio_context(c, ctx, visited, tran, errp)) { |
Kevin Wolf | 7f831d2 | 2023-09-11 11:46:17 +0200 | [diff] [blame] | 7606 | bdrv_graph_rdunlock_main_loop(); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7607 | return false; |
| 7608 | } |
| 7609 | } |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7610 | |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7611 | QLIST_FOREACH(c, &bs->children, next) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7612 | if (!bdrv_child_change_aio_context(c, ctx, visited, tran, errp)) { |
Kevin Wolf | 7f831d2 | 2023-09-11 11:46:17 +0200 | [diff] [blame] | 7613 | bdrv_graph_rdunlock_main_loop(); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7614 | return false; |
| 7615 | } |
| 7616 | } |
Kevin Wolf | 7f831d2 | 2023-09-11 11:46:17 +0200 | [diff] [blame] | 7617 | bdrv_graph_rdunlock_main_loop(); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7618 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7619 | state = g_new(BdrvStateSetAioContext, 1); |
| 7620 | *state = (BdrvStateSetAioContext) { |
| 7621 | .new_ctx = ctx, |
| 7622 | .bs = bs, |
| 7623 | }; |
| 7624 | |
| 7625 | /* Paired with bdrv_drained_end in bdrv_set_aio_context_clean() */ |
| 7626 | bdrv_drained_begin(bs); |
| 7627 | |
| 7628 | tran_add(tran, &set_aio_context, state); |
| 7629 | |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7630 | return true; |
| 7631 | } |
| 7632 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7633 | /* |
| 7634 | * Change bs's and recursively all of its parents' and children's AioContext |
| 7635 | * to the given new context, returning an error if that isn't possible. |
| 7636 | * |
| 7637 | * If ignore_child is not NULL, that child (and its subgraph) will not |
| 7638 | * be touched. |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7639 | */ |
Emanuele Giuseppe Esposito | a41cfda | 2022-10-25 04:49:51 -0400 | [diff] [blame] | 7640 | int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx, |
| 7641 | BdrvChild *ignore_child, Error **errp) |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7642 | { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7643 | Transaction *tran; |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7644 | GHashTable *visited; |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7645 | int ret; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7646 | GLOBAL_STATE_CODE(); |
| 7647 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7648 | /* |
| 7649 | * Recursion phase: go through all nodes of the graph. |
| 7650 | * Take care of checking that all nodes support changing AioContext |
Michael Tokarev | 3202d8e | 2023-07-14 14:06:05 +0300 | [diff] [blame] | 7651 | * and drain them, building a linear list of callbacks to run if everything |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7652 | * is successful (the transaction itself). |
| 7653 | */ |
| 7654 | tran = tran_new(); |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7655 | visited = g_hash_table_new(NULL, NULL); |
| 7656 | if (ignore_child) { |
| 7657 | g_hash_table_add(visited, ignore_child); |
| 7658 | } |
| 7659 | ret = bdrv_change_aio_context(bs, ctx, visited, tran, errp); |
| 7660 | g_hash_table_destroy(visited); |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7661 | |
| 7662 | /* |
| 7663 | * Linear phase: go through all callbacks collected in the transaction. |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 7664 | * Run all callbacks collected in the recursion to switch every node's |
| 7665 | * AioContext (transaction commit), or undo all changes done in the |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7666 | * recursion (transaction abort). |
| 7667 | */ |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7668 | |
| 7669 | if (!ret) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7670 | /* Just run clean() callbacks. No AioContext changed. */ |
| 7671 | tran_abort(tran); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7672 | return -EPERM; |
| 7673 | } |
| 7674 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7675 | tran_commit(tran); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7676 | return 0; |
| 7677 | } |
| 7678 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7679 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
| 7680 | void (*attached_aio_context)(AioContext *new_context, void *opaque), |
| 7681 | void (*detach_aio_context)(void *opaque), void *opaque) |
| 7682 | { |
| 7683 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); |
| 7684 | *ban = (BdrvAioNotifier){ |
| 7685 | .attached_aio_context = attached_aio_context, |
| 7686 | .detach_aio_context = detach_aio_context, |
| 7687 | .opaque = opaque |
| 7688 | }; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7689 | GLOBAL_STATE_CODE(); |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7690 | |
| 7691 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); |
| 7692 | } |
| 7693 | |
| 7694 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, |
| 7695 | void (*attached_aio_context)(AioContext *, |
| 7696 | void *), |
| 7697 | void (*detach_aio_context)(void *), |
| 7698 | void *opaque) |
| 7699 | { |
| 7700 | BdrvAioNotifier *ban, *ban_next; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7701 | GLOBAL_STATE_CODE(); |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7702 | |
| 7703 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 7704 | if (ban->attached_aio_context == attached_aio_context && |
| 7705 | ban->detach_aio_context == detach_aio_context && |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7706 | ban->opaque == opaque && |
| 7707 | ban->deleted == false) |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7708 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7709 | if (bs->walking_aio_notifiers) { |
| 7710 | ban->deleted = true; |
| 7711 | } else { |
| 7712 | bdrv_do_remove_aio_context_notifier(ban); |
| 7713 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7714 | return; |
| 7715 | } |
| 7716 | } |
| 7717 | |
| 7718 | abort(); |
| 7719 | } |
| 7720 | |
Max Reitz | 7748543 | 2014-10-27 11:12:50 +0100 | [diff] [blame] | 7721 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 7722 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
Maxim Levitsky | a3579bf | 2020-06-25 14:55:38 +0200 | [diff] [blame] | 7723 | bool force, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 7724 | Error **errp) |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 7725 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7726 | GLOBAL_STATE_CODE(); |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 7727 | if (!bs->drv) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 7728 | error_setg(errp, "Node is ejected"); |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 7729 | return -ENOMEDIUM; |
| 7730 | } |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 7731 | if (!bs->drv->bdrv_amend_options) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 7732 | error_setg(errp, "Block driver '%s' does not support option amendment", |
| 7733 | bs->drv->format_name); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 7734 | return -ENOTSUP; |
| 7735 | } |
Maxim Levitsky | a3579bf | 2020-06-25 14:55:38 +0200 | [diff] [blame] | 7736 | return bs->drv->bdrv_amend_options(bs, opts, status_cb, |
| 7737 | cb_opaque, force, errp); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 7738 | } |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 7739 | |
Max Reitz | 5d69b5a | 2020-02-18 11:34:41 +0100 | [diff] [blame] | 7740 | /* |
| 7741 | * This function checks whether the given @to_replace is allowed to be |
| 7742 | * replaced by a node that always shows the same data as @bs. This is |
| 7743 | * used for example to verify whether the mirror job can replace |
| 7744 | * @to_replace by the target mirrored from @bs. |
| 7745 | * To be replaceable, @bs and @to_replace may either be guaranteed to |
| 7746 | * always show the same data (because they are only connected through |
| 7747 | * filters), or some driver may allow replacing one of its children |
| 7748 | * because it can guarantee that this child's data is not visible at |
| 7749 | * all (for example, for dissenting quorum children that have no other |
| 7750 | * parents). |
| 7751 | */ |
| 7752 | bool bdrv_recurse_can_replace(BlockDriverState *bs, |
| 7753 | BlockDriverState *to_replace) |
| 7754 | { |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 7755 | BlockDriverState *filtered; |
| 7756 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 7757 | GLOBAL_STATE_CODE(); |
| 7758 | |
Max Reitz | 5d69b5a | 2020-02-18 11:34:41 +0100 | [diff] [blame] | 7759 | if (!bs || !bs->drv) { |
| 7760 | return false; |
| 7761 | } |
| 7762 | |
| 7763 | if (bs == to_replace) { |
| 7764 | return true; |
| 7765 | } |
| 7766 | |
| 7767 | /* See what the driver can do */ |
| 7768 | if (bs->drv->bdrv_recurse_can_replace) { |
| 7769 | return bs->drv->bdrv_recurse_can_replace(bs, to_replace); |
| 7770 | } |
| 7771 | |
| 7772 | /* For filters without an own implementation, we can recurse on our own */ |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 7773 | filtered = bdrv_filter_bs(bs); |
| 7774 | if (filtered) { |
| 7775 | return bdrv_recurse_can_replace(filtered, to_replace); |
Max Reitz | 5d69b5a | 2020-02-18 11:34:41 +0100 | [diff] [blame] | 7776 | } |
| 7777 | |
| 7778 | /* Safe default */ |
| 7779 | return false; |
| 7780 | } |
| 7781 | |
Max Reitz | 810803a | 2020-02-18 11:34:44 +0100 | [diff] [blame] | 7782 | /* |
| 7783 | * Check whether the given @node_name can be replaced by a node that |
| 7784 | * has the same data as @parent_bs. If so, return @node_name's BDS; |
| 7785 | * NULL otherwise. |
| 7786 | * |
| 7787 | * @node_name must be a (recursive) *child of @parent_bs (or this |
| 7788 | * function will return NULL). |
| 7789 | * |
| 7790 | * The result (whether the node can be replaced or not) is only valid |
| 7791 | * for as long as no graph or permission changes occur. |
| 7792 | */ |
Wen Congyang | e12f378 | 2015-07-17 10:12:22 +0800 | [diff] [blame] | 7793 | BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, |
| 7794 | const char *node_name, Error **errp) |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7795 | { |
| 7796 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 7797 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7798 | GLOBAL_STATE_CODE(); |
| 7799 | |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7800 | if (!to_replace_bs) { |
Connor Kuehl | 785ec4b | 2021-03-05 09:19:28 -0600 | [diff] [blame] | 7801 | error_setg(errp, "Failed to find node with node-name='%s'", node_name); |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7802 | return NULL; |
| 7803 | } |
| 7804 | |
| 7805 | if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) { |
Stefan Hajnoczi | b49f475 | 2023-12-05 13:20:03 -0500 | [diff] [blame] | 7806 | return NULL; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7807 | } |
| 7808 | |
| 7809 | /* We don't want arbitrary node of the BDS chain to be replaced only the top |
| 7810 | * most non filter in order to prevent data corruption. |
| 7811 | * Another benefit is that this tests exclude backing files which are |
| 7812 | * blocked by the backing blockers. |
| 7813 | */ |
Max Reitz | 810803a | 2020-02-18 11:34:44 +0100 | [diff] [blame] | 7814 | if (!bdrv_recurse_can_replace(parent_bs, to_replace_bs)) { |
| 7815 | error_setg(errp, "Cannot replace '%s' by a node mirrored from '%s', " |
| 7816 | "because it cannot be guaranteed that doing so would not " |
| 7817 | "lead to an abrupt change of visible data", |
| 7818 | node_name, parent_bs->node_name); |
Stefan Hajnoczi | b49f475 | 2023-12-05 13:20:03 -0500 | [diff] [blame] | 7819 | return NULL; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7820 | } |
| 7821 | |
| 7822 | return to_replace_bs; |
| 7823 | } |
Ming Lei | 448ad91 | 2014-07-04 18:04:33 +0800 | [diff] [blame] | 7824 | |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7825 | /** |
| 7826 | * Iterates through the list of runtime option keys that are said to |
| 7827 | * be "strong" for a BDS. An option is called "strong" if it changes |
| 7828 | * a BDS's data. For example, the null block driver's "size" and |
| 7829 | * "read-zeroes" options are strong, but its "latency-ns" option is |
| 7830 | * not. |
| 7831 | * |
| 7832 | * If a key returned by this function ends with a dot, all options |
| 7833 | * starting with that prefix are strong. |
| 7834 | */ |
| 7835 | static const char *const *strong_options(BlockDriverState *bs, |
| 7836 | const char *const *curopt) |
| 7837 | { |
| 7838 | static const char *const global_options[] = { |
| 7839 | "driver", "filename", NULL |
| 7840 | }; |
| 7841 | |
| 7842 | if (!curopt) { |
| 7843 | return &global_options[0]; |
| 7844 | } |
| 7845 | |
| 7846 | curopt++; |
| 7847 | if (curopt == &global_options[ARRAY_SIZE(global_options) - 1] && bs->drv) { |
| 7848 | curopt = bs->drv->strong_runtime_opts; |
| 7849 | } |
| 7850 | |
| 7851 | return (curopt && *curopt) ? curopt : NULL; |
| 7852 | } |
| 7853 | |
| 7854 | /** |
| 7855 | * Copies all strong runtime options from bs->options to the given |
| 7856 | * QDict. The set of strong option keys is determined by invoking |
| 7857 | * strong_options(). |
| 7858 | * |
| 7859 | * Returns true iff any strong option was present in bs->options (and |
| 7860 | * thus copied to the target QDict) with the exception of "filename" |
| 7861 | * and "driver". The caller is expected to use this value to decide |
| 7862 | * whether the existence of strong options prevents the generation of |
| 7863 | * a plain filename. |
| 7864 | */ |
| 7865 | static bool append_strong_runtime_options(QDict *d, BlockDriverState *bs) |
| 7866 | { |
| 7867 | bool found_any = false; |
| 7868 | const char *const *option_name = NULL; |
| 7869 | |
| 7870 | if (!bs->drv) { |
| 7871 | return false; |
| 7872 | } |
| 7873 | |
| 7874 | while ((option_name = strong_options(bs, option_name))) { |
| 7875 | bool option_given = false; |
| 7876 | |
| 7877 | assert(strlen(*option_name) > 0); |
| 7878 | if ((*option_name)[strlen(*option_name) - 1] != '.') { |
| 7879 | QObject *entry = qdict_get(bs->options, *option_name); |
| 7880 | if (!entry) { |
| 7881 | continue; |
| 7882 | } |
| 7883 | |
| 7884 | qdict_put_obj(d, *option_name, qobject_ref(entry)); |
| 7885 | option_given = true; |
| 7886 | } else { |
| 7887 | const QDictEntry *entry; |
| 7888 | for (entry = qdict_first(bs->options); entry; |
| 7889 | entry = qdict_next(bs->options, entry)) |
| 7890 | { |
| 7891 | if (strstart(qdict_entry_key(entry), *option_name, NULL)) { |
| 7892 | qdict_put_obj(d, qdict_entry_key(entry), |
| 7893 | qobject_ref(qdict_entry_value(entry))); |
| 7894 | option_given = true; |
| 7895 | } |
| 7896 | } |
| 7897 | } |
| 7898 | |
| 7899 | /* While "driver" and "filename" need to be included in a JSON filename, |
| 7900 | * their existence does not prohibit generation of a plain filename. */ |
| 7901 | if (!found_any && option_given && |
| 7902 | strcmp(*option_name, "driver") && strcmp(*option_name, "filename")) |
| 7903 | { |
| 7904 | found_any = true; |
| 7905 | } |
| 7906 | } |
| 7907 | |
Max Reitz | 62a01a27 | 2019-02-01 20:29:34 +0100 | [diff] [blame] | 7908 | if (!qdict_haskey(d, "driver")) { |
| 7909 | /* Drivers created with bdrv_new_open_driver() may not have a |
| 7910 | * @driver option. Add it here. */ |
| 7911 | qdict_put_str(d, "driver", bs->drv->format_name); |
| 7912 | } |
| 7913 | |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7914 | return found_any; |
| 7915 | } |
| 7916 | |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7917 | /* Note: This function may return false positives; it may return true |
| 7918 | * even if opening the backing file specified by bs's image header |
| 7919 | * would result in exactly bs->backing. */ |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 7920 | static bool GRAPH_RDLOCK bdrv_backing_overridden(BlockDriverState *bs) |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7921 | { |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 7922 | GLOBAL_STATE_CODE(); |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7923 | if (bs->backing) { |
| 7924 | return strcmp(bs->auto_backing_file, |
| 7925 | bs->backing->bs->filename); |
| 7926 | } else { |
| 7927 | /* No backing BDS, so if the image header reports any backing |
| 7928 | * file, it must have been suppressed */ |
| 7929 | return bs->auto_backing_file[0] != '\0'; |
| 7930 | } |
| 7931 | } |
| 7932 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7933 | /* Updates the following BDS fields: |
| 7934 | * - exact_filename: A filename which may be used for opening a block device |
| 7935 | * which (mostly) equals the given BDS (even without any |
| 7936 | * other options; so reading and writing must return the same |
| 7937 | * results, but caching etc. may be different) |
| 7938 | * - full_open_options: Options which, when given when opening a block device |
| 7939 | * (without a filename), result in a BDS (mostly) |
| 7940 | * equalling the given one |
| 7941 | * - filename: If exact_filename is set, it is copied here. Otherwise, |
| 7942 | * full_open_options is converted to a JSON object, prefixed with |
| 7943 | * "json:" (for use through the JSON pseudo protocol) and put here. |
| 7944 | */ |
| 7945 | void bdrv_refresh_filename(BlockDriverState *bs) |
| 7946 | { |
| 7947 | BlockDriver *drv = bs->drv; |
Max Reitz | e24518e | 2019-02-01 20:29:06 +0100 | [diff] [blame] | 7948 | BdrvChild *child; |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 7949 | BlockDriverState *primary_child_bs; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7950 | QDict *opts; |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7951 | bool backing_overridden; |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 7952 | bool generate_json_filename; /* Whether our default implementation should |
| 7953 | fill exact_filename (false) or not (true) */ |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7954 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7955 | GLOBAL_STATE_CODE(); |
| 7956 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7957 | if (!drv) { |
| 7958 | return; |
| 7959 | } |
| 7960 | |
Max Reitz | e24518e | 2019-02-01 20:29:06 +0100 | [diff] [blame] | 7961 | /* This BDS's file name may depend on any of its children's file names, so |
| 7962 | * refresh those first */ |
| 7963 | QLIST_FOREACH(child, &bs->children, next) { |
| 7964 | bdrv_refresh_filename(child->bs); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7965 | } |
| 7966 | |
Max Reitz | bb808d5 | 2019-02-01 20:29:07 +0100 | [diff] [blame] | 7967 | if (bs->implicit) { |
| 7968 | /* For implicit nodes, just copy everything from the single child */ |
| 7969 | child = QLIST_FIRST(&bs->children); |
| 7970 | assert(QLIST_NEXT(child, next) == NULL); |
| 7971 | |
| 7972 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), |
| 7973 | child->bs->exact_filename); |
| 7974 | pstrcpy(bs->filename, sizeof(bs->filename), child->bs->filename); |
| 7975 | |
Pan Nengyuan | cb89561 | 2020-01-16 16:56:00 +0800 | [diff] [blame] | 7976 | qobject_unref(bs->full_open_options); |
Max Reitz | bb808d5 | 2019-02-01 20:29:07 +0100 | [diff] [blame] | 7977 | bs->full_open_options = qobject_ref(child->bs->full_open_options); |
| 7978 | |
| 7979 | return; |
| 7980 | } |
| 7981 | |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7982 | backing_overridden = bdrv_backing_overridden(bs); |
| 7983 | |
| 7984 | if (bs->open_flags & BDRV_O_NO_IO) { |
| 7985 | /* Without I/O, the backing file does not change anything. |
| 7986 | * Therefore, in such a case (primarily qemu-img), we can |
| 7987 | * pretend the backing file has not been overridden even if |
| 7988 | * it technically has been. */ |
| 7989 | backing_overridden = false; |
| 7990 | } |
| 7991 | |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7992 | /* Gather the options QDict */ |
| 7993 | opts = qdict_new(); |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 7994 | generate_json_filename = append_strong_runtime_options(opts, bs); |
| 7995 | generate_json_filename |= backing_overridden; |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7996 | |
| 7997 | if (drv->bdrv_gather_child_options) { |
| 7998 | /* Some block drivers may not want to present all of their children's |
| 7999 | * options, or name them differently from BdrvChild.name */ |
| 8000 | drv->bdrv_gather_child_options(bs, opts, backing_overridden); |
| 8001 | } else { |
| 8002 | QLIST_FOREACH(child, &bs->children, next) { |
Max Reitz | 25191e5 | 2020-05-13 13:05:33 +0200 | [diff] [blame] | 8003 | if (child == bs->backing && !backing_overridden) { |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 8004 | /* We can skip the backing BDS if it has not been overridden */ |
| 8005 | continue; |
| 8006 | } |
| 8007 | |
| 8008 | qdict_put(opts, child->name, |
| 8009 | qobject_ref(child->bs->full_open_options)); |
| 8010 | } |
| 8011 | |
| 8012 | if (backing_overridden && !bs->backing) { |
| 8013 | /* Force no backing file */ |
| 8014 | qdict_put_null(opts, "backing"); |
| 8015 | } |
| 8016 | } |
| 8017 | |
| 8018 | qobject_unref(bs->full_open_options); |
| 8019 | bs->full_open_options = opts; |
| 8020 | |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8021 | primary_child_bs = bdrv_primary_bs(bs); |
| 8022 | |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 8023 | if (drv->bdrv_refresh_filename) { |
| 8024 | /* Obsolete information is of no use here, so drop the old file name |
| 8025 | * information before refreshing it */ |
| 8026 | bs->exact_filename[0] = '\0'; |
| 8027 | |
| 8028 | drv->bdrv_refresh_filename(bs); |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8029 | } else if (primary_child_bs) { |
| 8030 | /* |
| 8031 | * Try to reconstruct valid information from the underlying |
| 8032 | * file -- this only works for format nodes (filter nodes |
| 8033 | * cannot be probed and as such must be selected by the user |
| 8034 | * either through an options dict, or through a special |
| 8035 | * filename which the filter driver must construct in its |
| 8036 | * .bdrv_refresh_filename() implementation). |
| 8037 | */ |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 8038 | |
| 8039 | bs->exact_filename[0] = '\0'; |
| 8040 | |
Max Reitz | fb695c7 | 2019-02-01 20:29:29 +0100 | [diff] [blame] | 8041 | /* |
| 8042 | * We can use the underlying file's filename if: |
| 8043 | * - it has a filename, |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8044 | * - the current BDS is not a filter, |
Max Reitz | fb695c7 | 2019-02-01 20:29:29 +0100 | [diff] [blame] | 8045 | * - the file is a protocol BDS, and |
| 8046 | * - opening that file (as this BDS's format) will automatically create |
| 8047 | * the BDS tree we have right now, that is: |
| 8048 | * - the user did not significantly change this BDS's behavior with |
| 8049 | * some explicit (strong) options |
| 8050 | * - no non-file child of this BDS has been overridden by the user |
| 8051 | * Both of these conditions are represented by generate_json_filename. |
| 8052 | */ |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8053 | if (primary_child_bs->exact_filename[0] && |
Paolo Bonzini | 41770f6 | 2022-11-24 16:21:18 +0100 | [diff] [blame] | 8054 | primary_child_bs->drv->protocol_name && |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8055 | !drv->is_filter && !generate_json_filename) |
Max Reitz | fb695c7 | 2019-02-01 20:29:29 +0100 | [diff] [blame] | 8056 | { |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8057 | strcpy(bs->exact_filename, primary_child_bs->exact_filename); |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 8058 | } |
| 8059 | } |
| 8060 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 8061 | if (bs->exact_filename[0]) { |
| 8062 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 8063 | } else { |
Markus Armbruster | eab3a46 | 2020-12-11 18:11:37 +0100 | [diff] [blame] | 8064 | GString *json = qobject_to_json(QOBJECT(bs->full_open_options)); |
Eric Blake | 5c86bdf | 2020-06-08 13:26:38 -0500 | [diff] [blame] | 8065 | if (snprintf(bs->filename, sizeof(bs->filename), "json:%s", |
Markus Armbruster | eab3a46 | 2020-12-11 18:11:37 +0100 | [diff] [blame] | 8066 | json->str) >= sizeof(bs->filename)) { |
Eric Blake | 5c86bdf | 2020-06-08 13:26:38 -0500 | [diff] [blame] | 8067 | /* Give user a hint if we truncated things. */ |
| 8068 | strcpy(bs->filename + sizeof(bs->filename) - 4, "..."); |
| 8069 | } |
Markus Armbruster | eab3a46 | 2020-12-11 18:11:37 +0100 | [diff] [blame] | 8070 | g_string_free(json, true); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 8071 | } |
| 8072 | } |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8073 | |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 8074 | char *bdrv_dirname(BlockDriverState *bs, Error **errp) |
| 8075 | { |
| 8076 | BlockDriver *drv = bs->drv; |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8077 | BlockDriverState *child_bs; |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 8078 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 8079 | GLOBAL_STATE_CODE(); |
| 8080 | |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 8081 | if (!drv) { |
| 8082 | error_setg(errp, "Node '%s' is ejected", bs->node_name); |
| 8083 | return NULL; |
| 8084 | } |
| 8085 | |
| 8086 | if (drv->bdrv_dirname) { |
| 8087 | return drv->bdrv_dirname(bs, errp); |
| 8088 | } |
| 8089 | |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8090 | child_bs = bdrv_primary_bs(bs); |
| 8091 | if (child_bs) { |
| 8092 | return bdrv_dirname(child_bs, errp); |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 8093 | } |
| 8094 | |
| 8095 | bdrv_refresh_filename(bs); |
| 8096 | if (bs->exact_filename[0] != '\0') { |
| 8097 | return path_combine(bs->exact_filename, ""); |
| 8098 | } |
| 8099 | |
| 8100 | error_setg(errp, "Cannot generate a base directory for %s nodes", |
| 8101 | drv->format_name); |
| 8102 | return NULL; |
| 8103 | } |
| 8104 | |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8105 | /* |
| 8106 | * Hot add/remove a BDS's child. So the user can take a child offline when |
| 8107 | * it is broken and take a new child online |
| 8108 | */ |
| 8109 | void bdrv_add_child(BlockDriverState *parent_bs, BlockDriverState *child_bs, |
| 8110 | Error **errp) |
| 8111 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 8112 | GLOBAL_STATE_CODE(); |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8113 | if (!parent_bs->drv || !parent_bs->drv->bdrv_add_child) { |
| 8114 | error_setg(errp, "The node %s does not support adding a child", |
| 8115 | bdrv_get_device_or_node_name(parent_bs)); |
| 8116 | return; |
| 8117 | } |
| 8118 | |
Sam Li | 774c726 | 2023-05-08 12:55:30 +0800 | [diff] [blame] | 8119 | /* |
| 8120 | * Non-zoned block drivers do not follow zoned storage constraints |
| 8121 | * (i.e. sequential writes to zones). Refuse mixing zoned and non-zoned |
| 8122 | * drivers in a graph. |
| 8123 | */ |
| 8124 | if (!parent_bs->drv->supports_zoned_children && |
| 8125 | child_bs->bl.zoned == BLK_Z_HM) { |
| 8126 | /* |
| 8127 | * The host-aware model allows zoned storage constraints and random |
| 8128 | * write. Allow mixing host-aware and non-zoned drivers. Using |
| 8129 | * host-aware device as a regular device. |
| 8130 | */ |
| 8131 | error_setg(errp, "Cannot add a %s child to a %s parent", |
| 8132 | child_bs->bl.zoned == BLK_Z_HM ? "zoned" : "non-zoned", |
| 8133 | parent_bs->drv->supports_zoned_children ? |
| 8134 | "support zoned children" : "not support zoned children"); |
| 8135 | return; |
| 8136 | } |
| 8137 | |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8138 | if (!QLIST_EMPTY(&child_bs->parents)) { |
| 8139 | error_setg(errp, "The node %s already has a parent", |
| 8140 | child_bs->node_name); |
| 8141 | return; |
| 8142 | } |
| 8143 | |
| 8144 | parent_bs->drv->bdrv_add_child(parent_bs, child_bs, errp); |
| 8145 | } |
| 8146 | |
| 8147 | void bdrv_del_child(BlockDriverState *parent_bs, BdrvChild *child, Error **errp) |
| 8148 | { |
| 8149 | BdrvChild *tmp; |
| 8150 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 8151 | GLOBAL_STATE_CODE(); |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8152 | if (!parent_bs->drv || !parent_bs->drv->bdrv_del_child) { |
| 8153 | error_setg(errp, "The node %s does not support removing a child", |
| 8154 | bdrv_get_device_or_node_name(parent_bs)); |
| 8155 | return; |
| 8156 | } |
| 8157 | |
| 8158 | QLIST_FOREACH(tmp, &parent_bs->children, next) { |
| 8159 | if (tmp == child) { |
| 8160 | break; |
| 8161 | } |
| 8162 | } |
| 8163 | |
| 8164 | if (!tmp) { |
| 8165 | error_setg(errp, "The node %s does not have a child named %s", |
| 8166 | bdrv_get_device_or_node_name(parent_bs), |
| 8167 | bdrv_get_device_or_node_name(child->bs)); |
| 8168 | return; |
| 8169 | } |
| 8170 | |
| 8171 | parent_bs->drv->bdrv_del_child(parent_bs, child, errp); |
| 8172 | } |
Max Reitz | 6f7a3b5 | 2020-04-29 16:11:23 +0200 | [diff] [blame] | 8173 | |
| 8174 | int bdrv_make_empty(BdrvChild *c, Error **errp) |
| 8175 | { |
| 8176 | BlockDriver *drv = c->bs->drv; |
| 8177 | int ret; |
| 8178 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 8179 | GLOBAL_STATE_CODE(); |
Max Reitz | 6f7a3b5 | 2020-04-29 16:11:23 +0200 | [diff] [blame] | 8180 | assert(c->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)); |
| 8181 | |
| 8182 | if (!drv->bdrv_make_empty) { |
| 8183 | error_setg(errp, "%s does not support emptying nodes", |
| 8184 | drv->format_name); |
| 8185 | return -ENOTSUP; |
| 8186 | } |
| 8187 | |
| 8188 | ret = drv->bdrv_make_empty(c->bs); |
| 8189 | if (ret < 0) { |
| 8190 | error_setg_errno(errp, -ret, "Failed to empty %s", |
| 8191 | c->bs->filename); |
| 8192 | return ret; |
| 8193 | } |
| 8194 | |
| 8195 | return 0; |
| 8196 | } |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8197 | |
| 8198 | /* |
| 8199 | * Return the child that @bs acts as an overlay for, and from which data may be |
| 8200 | * copied in COW or COR operations. Usually this is the backing file. |
| 8201 | */ |
| 8202 | BdrvChild *bdrv_cow_child(BlockDriverState *bs) |
| 8203 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8204 | IO_CODE(); |
| 8205 | |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8206 | if (!bs || !bs->drv) { |
| 8207 | return NULL; |
| 8208 | } |
| 8209 | |
| 8210 | if (bs->drv->is_filter) { |
| 8211 | return NULL; |
| 8212 | } |
| 8213 | |
| 8214 | if (!bs->backing) { |
| 8215 | return NULL; |
| 8216 | } |
| 8217 | |
| 8218 | assert(bs->backing->role & BDRV_CHILD_COW); |
| 8219 | return bs->backing; |
| 8220 | } |
| 8221 | |
| 8222 | /* |
| 8223 | * If @bs acts as a filter for exactly one of its children, return |
| 8224 | * that child. |
| 8225 | */ |
| 8226 | BdrvChild *bdrv_filter_child(BlockDriverState *bs) |
| 8227 | { |
| 8228 | BdrvChild *c; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8229 | IO_CODE(); |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8230 | |
| 8231 | if (!bs || !bs->drv) { |
| 8232 | return NULL; |
| 8233 | } |
| 8234 | |
| 8235 | if (!bs->drv->is_filter) { |
| 8236 | return NULL; |
| 8237 | } |
| 8238 | |
| 8239 | /* Only one of @backing or @file may be used */ |
| 8240 | assert(!(bs->backing && bs->file)); |
| 8241 | |
| 8242 | c = bs->backing ?: bs->file; |
| 8243 | if (!c) { |
| 8244 | return NULL; |
| 8245 | } |
| 8246 | |
| 8247 | assert(c->role & BDRV_CHILD_FILTERED); |
| 8248 | return c; |
| 8249 | } |
| 8250 | |
| 8251 | /* |
| 8252 | * Return either the result of bdrv_cow_child() or bdrv_filter_child(), |
| 8253 | * whichever is non-NULL. |
| 8254 | * |
| 8255 | * Return NULL if both are NULL. |
| 8256 | */ |
| 8257 | BdrvChild *bdrv_filter_or_cow_child(BlockDriverState *bs) |
| 8258 | { |
| 8259 | BdrvChild *cow_child = bdrv_cow_child(bs); |
| 8260 | BdrvChild *filter_child = bdrv_filter_child(bs); |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8261 | IO_CODE(); |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8262 | |
| 8263 | /* Filter nodes cannot have COW backing files */ |
| 8264 | assert(!(cow_child && filter_child)); |
| 8265 | |
| 8266 | return cow_child ?: filter_child; |
| 8267 | } |
| 8268 | |
| 8269 | /* |
| 8270 | * Return the primary child of this node: For filters, that is the |
| 8271 | * filtered child. For other nodes, that is usually the child storing |
| 8272 | * metadata. |
| 8273 | * (A generally more helpful description is that this is (usually) the |
| 8274 | * child that has the same filename as @bs.) |
| 8275 | * |
| 8276 | * Drivers do not necessarily have a primary child; for example quorum |
| 8277 | * does not. |
| 8278 | */ |
| 8279 | BdrvChild *bdrv_primary_child(BlockDriverState *bs) |
| 8280 | { |
| 8281 | BdrvChild *c, *found = NULL; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8282 | IO_CODE(); |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8283 | |
| 8284 | QLIST_FOREACH(c, &bs->children, next) { |
| 8285 | if (c->role & BDRV_CHILD_PRIMARY) { |
| 8286 | assert(!found); |
| 8287 | found = c; |
| 8288 | } |
| 8289 | } |
| 8290 | |
| 8291 | return found; |
| 8292 | } |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8293 | |
Kevin Wolf | ec82cc4 | 2023-10-27 17:53:20 +0200 | [diff] [blame] | 8294 | static BlockDriverState * GRAPH_RDLOCK |
| 8295 | bdrv_do_skip_filters(BlockDriverState *bs, bool stop_on_explicit_filter) |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8296 | { |
| 8297 | BdrvChild *c; |
| 8298 | |
| 8299 | if (!bs) { |
| 8300 | return NULL; |
| 8301 | } |
| 8302 | |
| 8303 | while (!(stop_on_explicit_filter && !bs->implicit)) { |
| 8304 | c = bdrv_filter_child(bs); |
| 8305 | if (!c) { |
| 8306 | /* |
| 8307 | * A filter that is embedded in a working block graph must |
| 8308 | * have a child. Assert this here so this function does |
| 8309 | * not return a filter node that is not expected by the |
| 8310 | * caller. |
| 8311 | */ |
| 8312 | assert(!bs->drv || !bs->drv->is_filter); |
| 8313 | break; |
| 8314 | } |
| 8315 | bs = c->bs; |
| 8316 | } |
| 8317 | /* |
| 8318 | * Note that this treats nodes with bs->drv == NULL as not being |
| 8319 | * filters (bs->drv == NULL should be replaced by something else |
| 8320 | * anyway). |
| 8321 | * The advantage of this behavior is that this function will thus |
| 8322 | * always return a non-NULL value (given a non-NULL @bs). |
| 8323 | */ |
| 8324 | |
| 8325 | return bs; |
| 8326 | } |
| 8327 | |
| 8328 | /* |
| 8329 | * Return the first BDS that has not been added implicitly or that |
| 8330 | * does not have a filtered child down the chain starting from @bs |
| 8331 | * (including @bs itself). |
| 8332 | */ |
| 8333 | BlockDriverState *bdrv_skip_implicit_filters(BlockDriverState *bs) |
| 8334 | { |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 8335 | GLOBAL_STATE_CODE(); |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8336 | return bdrv_do_skip_filters(bs, true); |
| 8337 | } |
| 8338 | |
| 8339 | /* |
| 8340 | * Return the first BDS that does not have a filtered child down the |
| 8341 | * chain starting from @bs (including @bs itself). |
| 8342 | */ |
| 8343 | BlockDriverState *bdrv_skip_filters(BlockDriverState *bs) |
| 8344 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8345 | IO_CODE(); |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8346 | return bdrv_do_skip_filters(bs, false); |
| 8347 | } |
| 8348 | |
| 8349 | /* |
| 8350 | * For a backing chain, return the first non-filter backing image of |
| 8351 | * the first non-filter image. |
| 8352 | */ |
| 8353 | BlockDriverState *bdrv_backing_chain_next(BlockDriverState *bs) |
| 8354 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8355 | IO_CODE(); |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8356 | return bdrv_skip_filters(bdrv_cow_bs(bdrv_skip_filters(bs))); |
| 8357 | } |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8358 | |
| 8359 | /** |
| 8360 | * Check whether [offset, offset + bytes) overlaps with the cached |
| 8361 | * block-status data region. |
| 8362 | * |
| 8363 | * If so, and @pnum is not NULL, set *pnum to `bsc.data_end - offset`, |
| 8364 | * which is what bdrv_bsc_is_data()'s interface needs. |
| 8365 | * Otherwise, *pnum is not touched. |
| 8366 | */ |
| 8367 | static bool bdrv_bsc_range_overlaps_locked(BlockDriverState *bs, |
| 8368 | int64_t offset, int64_t bytes, |
| 8369 | int64_t *pnum) |
| 8370 | { |
| 8371 | BdrvBlockStatusCache *bsc = qatomic_rcu_read(&bs->block_status_cache); |
| 8372 | bool overlaps; |
| 8373 | |
| 8374 | overlaps = |
| 8375 | qatomic_read(&bsc->valid) && |
| 8376 | ranges_overlap(offset, bytes, bsc->data_start, |
| 8377 | bsc->data_end - bsc->data_start); |
| 8378 | |
| 8379 | if (overlaps && pnum) { |
| 8380 | *pnum = bsc->data_end - offset; |
| 8381 | } |
| 8382 | |
| 8383 | return overlaps; |
| 8384 | } |
| 8385 | |
| 8386 | /** |
| 8387 | * See block_int.h for this function's documentation. |
| 8388 | */ |
| 8389 | bool bdrv_bsc_is_data(BlockDriverState *bs, int64_t offset, int64_t *pnum) |
| 8390 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8391 | IO_CODE(); |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8392 | RCU_READ_LOCK_GUARD(); |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8393 | return bdrv_bsc_range_overlaps_locked(bs, offset, 1, pnum); |
| 8394 | } |
| 8395 | |
| 8396 | /** |
| 8397 | * See block_int.h for this function's documentation. |
| 8398 | */ |
| 8399 | void bdrv_bsc_invalidate_range(BlockDriverState *bs, |
| 8400 | int64_t offset, int64_t bytes) |
| 8401 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8402 | IO_CODE(); |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8403 | RCU_READ_LOCK_GUARD(); |
| 8404 | |
| 8405 | if (bdrv_bsc_range_overlaps_locked(bs, offset, bytes, NULL)) { |
| 8406 | qatomic_set(&bs->block_status_cache->valid, false); |
| 8407 | } |
| 8408 | } |
| 8409 | |
| 8410 | /** |
| 8411 | * See block_int.h for this function's documentation. |
| 8412 | */ |
| 8413 | void bdrv_bsc_fill(BlockDriverState *bs, int64_t offset, int64_t bytes) |
| 8414 | { |
| 8415 | BdrvBlockStatusCache *new_bsc = g_new(BdrvBlockStatusCache, 1); |
| 8416 | BdrvBlockStatusCache *old_bsc; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8417 | IO_CODE(); |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8418 | |
| 8419 | *new_bsc = (BdrvBlockStatusCache) { |
| 8420 | .valid = true, |
| 8421 | .data_start = offset, |
| 8422 | .data_end = offset + bytes, |
| 8423 | }; |
| 8424 | |
| 8425 | QEMU_LOCK_GUARD(&bs->bsc_modify_lock); |
| 8426 | |
| 8427 | old_bsc = qatomic_rcu_read(&bs->block_status_cache); |
| 8428 | qatomic_rcu_set(&bs->block_status_cache, new_bsc); |
| 8429 | if (old_bsc) { |
| 8430 | g_free_rcu(old_bsc, rcu); |
| 8431 | } |
| 8432 | } |