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, |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 89 | Error **errp); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 90 | |
Kevin Wolf | bfb8aa6 | 2021-10-18 15:47:14 +0200 | [diff] [blame] | 91 | static bool bdrv_recurse_has_child(BlockDriverState *bs, |
| 92 | BlockDriverState *child); |
| 93 | |
Kevin Wolf | ad29eb3 | 2023-09-11 11:46:07 +0200 | [diff] [blame] | 94 | static void GRAPH_WRLOCK |
| 95 | bdrv_replace_child_noperm(BdrvChild *child, BlockDriverState *new_bs); |
| 96 | |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 97 | static void GRAPH_WRLOCK |
| 98 | bdrv_remove_child(BdrvChild *child, Transaction *tran); |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 99 | |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 100 | static int bdrv_reopen_prepare(BDRVReopenState *reopen_state, |
| 101 | BlockReopenQueue *queue, |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 102 | Transaction *change_child_tran, Error **errp); |
Vladimir Sementsov-Ogievskiy | 53e96d1 | 2021-04-28 18:17:35 +0300 | [diff] [blame] | 103 | static void bdrv_reopen_commit(BDRVReopenState *reopen_state); |
| 104 | static void bdrv_reopen_abort(BDRVReopenState *reopen_state); |
| 105 | |
Emanuele Giuseppe Esposito | fa8fc1d | 2021-12-15 07:11:38 -0500 | [diff] [blame] | 106 | static bool bdrv_backing_overridden(BlockDriverState *bs); |
| 107 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 108 | static bool bdrv_change_aio_context(BlockDriverState *bs, AioContext *ctx, |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 109 | GHashTable *visited, Transaction *tran, |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 110 | Error **errp); |
| 111 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 112 | /* If non-zero, use only whitelisted block drivers */ |
| 113 | static int use_bdrv_whitelist; |
| 114 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 115 | #ifdef _WIN32 |
| 116 | static int is_windows_drive_prefix(const char *filename) |
| 117 | { |
| 118 | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 119 | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 120 | filename[1] == ':'); |
| 121 | } |
| 122 | |
| 123 | int is_windows_drive(const char *filename) |
| 124 | { |
| 125 | if (is_windows_drive_prefix(filename) && |
| 126 | filename[2] == '\0') |
| 127 | return 1; |
| 128 | if (strstart(filename, "\\\\.\\", NULL) || |
| 129 | strstart(filename, "//./", NULL)) |
| 130 | return 1; |
| 131 | return 0; |
| 132 | } |
| 133 | #endif |
| 134 | |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 135 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
| 136 | { |
| 137 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 138 | /* 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] | 139 | return MAX(4096, qemu_real_host_page_size()); |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 140 | } |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 141 | IO_CODE(); |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 142 | |
| 143 | return bs->bl.opt_mem_alignment; |
| 144 | } |
| 145 | |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 146 | size_t bdrv_min_mem_align(BlockDriverState *bs) |
| 147 | { |
| 148 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 149 | /* 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] | 150 | return MAX(4096, qemu_real_host_page_size()); |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 151 | } |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 152 | IO_CODE(); |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 153 | |
| 154 | return bs->bl.min_mem_alignment; |
| 155 | } |
| 156 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 157 | /* check if the path starts with "<protocol>:" */ |
Max Reitz | 5c98415 | 2014-12-03 14:57:22 +0100 | [diff] [blame] | 158 | int path_has_protocol(const char *path) |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 159 | { |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 160 | const char *p; |
| 161 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 162 | #ifdef _WIN32 |
| 163 | if (is_windows_drive(path) || |
| 164 | is_windows_drive_prefix(path)) { |
| 165 | return 0; |
| 166 | } |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 167 | p = path + strcspn(path, ":/\\"); |
| 168 | #else |
| 169 | p = path + strcspn(path, ":/"); |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 170 | #endif |
| 171 | |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 172 | return *p == ':'; |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 173 | } |
| 174 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 175 | int path_is_absolute(const char *path) |
| 176 | { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 177 | #ifdef _WIN32 |
| 178 | /* specific case for names like: "\\.\d:" */ |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 179 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 180 | return 1; |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 181 | } |
| 182 | return (*path == '/' || *path == '\\'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 183 | #else |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 184 | return (*path == '/'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 185 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 186 | } |
| 187 | |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 188 | /* if filename is absolute, just return its duplicate. Otherwise, build a |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 189 | path to it by considering it is relative to base_path. URL are |
| 190 | supported. */ |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 191 | char *path_combine(const char *base_path, const char *filename) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 192 | { |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 193 | const char *protocol_stripped = NULL; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 194 | const char *p, *p1; |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 195 | char *result; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 196 | int len; |
| 197 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 198 | if (path_is_absolute(filename)) { |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 199 | return g_strdup(filename); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 200 | } |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 201 | |
| 202 | if (path_has_protocol(base_path)) { |
| 203 | protocol_stripped = strchr(base_path, ':'); |
| 204 | if (protocol_stripped) { |
| 205 | protocol_stripped++; |
| 206 | } |
| 207 | } |
| 208 | p = protocol_stripped ?: base_path; |
| 209 | |
| 210 | p1 = strrchr(base_path, '/'); |
| 211 | #ifdef _WIN32 |
| 212 | { |
| 213 | const char *p2; |
| 214 | p2 = strrchr(base_path, '\\'); |
| 215 | if (!p1 || p2 > p1) { |
| 216 | p1 = p2; |
| 217 | } |
| 218 | } |
| 219 | #endif |
| 220 | if (p1) { |
| 221 | p1++; |
| 222 | } else { |
| 223 | p1 = base_path; |
| 224 | } |
| 225 | if (p1 > p) { |
| 226 | p = p1; |
| 227 | } |
| 228 | len = p - base_path; |
| 229 | |
| 230 | result = g_malloc(len + strlen(filename) + 1); |
| 231 | memcpy(result, base_path, len); |
| 232 | strcpy(result + len, filename); |
| 233 | |
| 234 | return result; |
| 235 | } |
| 236 | |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 237 | /* |
| 238 | * Helper function for bdrv_parse_filename() implementations to remove optional |
| 239 | * protocol prefixes (especially "file:") from a filename and for putting the |
| 240 | * stripped filename into the options QDict if there is such a prefix. |
| 241 | */ |
| 242 | void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix, |
| 243 | QDict *options) |
| 244 | { |
| 245 | if (strstart(filename, prefix, &filename)) { |
| 246 | /* Stripping the explicit protocol prefix may result in a protocol |
| 247 | * prefix being (wrongly) detected (if the filename contains a colon) */ |
| 248 | if (path_has_protocol(filename)) { |
Markus Armbruster | 18cf67c | 2020-12-11 18:11:51 +0100 | [diff] [blame] | 249 | GString *fat_filename; |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 250 | |
| 251 | /* This means there is some colon before the first slash; therefore, |
| 252 | * this cannot be an absolute path */ |
| 253 | assert(!path_is_absolute(filename)); |
| 254 | |
| 255 | /* And we can thus fix the protocol detection issue by prefixing it |
| 256 | * by "./" */ |
Markus Armbruster | 18cf67c | 2020-12-11 18:11:51 +0100 | [diff] [blame] | 257 | fat_filename = g_string_new("./"); |
| 258 | g_string_append(fat_filename, filename); |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 259 | |
Markus Armbruster | 18cf67c | 2020-12-11 18:11:51 +0100 | [diff] [blame] | 260 | assert(!path_has_protocol(fat_filename->str)); |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 261 | |
Markus Armbruster | 18cf67c | 2020-12-11 18:11:51 +0100 | [diff] [blame] | 262 | qdict_put(options, "filename", |
| 263 | qstring_from_gstring(fat_filename)); |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 264 | } else { |
| 265 | /* If no protocol prefix was detected, we can use the shortened |
| 266 | * filename as-is */ |
| 267 | qdict_put_str(options, "filename", filename); |
| 268 | } |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 273 | /* Returns whether the image file is opened as read-only. Note that this can |
| 274 | * return false and writing to the image file is still not possible because the |
| 275 | * image is inactivated. */ |
Jeff Cody | 93ed524 | 2017-04-07 16:55:28 -0400 | [diff] [blame] | 276 | bool bdrv_is_read_only(BlockDriverState *bs) |
| 277 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 278 | IO_CODE(); |
Vladimir Sementsov-Ogievskiy | 975da07 | 2021-05-27 18:40:55 +0300 | [diff] [blame] | 279 | return !(bs->open_flags & BDRV_O_RDWR); |
Jeff Cody | 93ed524 | 2017-04-07 16:55:28 -0400 | [diff] [blame] | 280 | } |
| 281 | |
Kevin Wolf | 4026f1c | 2023-09-29 16:51:47 +0200 | [diff] [blame] | 282 | static int GRAPH_RDLOCK |
| 283 | bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, |
| 284 | bool ignore_allow_rdw, Error **errp) |
Jeff Cody | fe5241b | 2017-04-07 16:55:25 -0400 | [diff] [blame] | 285 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 286 | IO_CODE(); |
| 287 | |
Jeff Cody | e2b8247 | 2017-04-07 16:55:26 -0400 | [diff] [blame] | 288 | /* Do not set read_only if copy_on_read is enabled */ |
| 289 | if (bs->copy_on_read && read_only) { |
| 290 | error_setg(errp, "Can't set node '%s' to r/o with copy-on-read enabled", |
| 291 | bdrv_get_device_or_node_name(bs)); |
| 292 | return -EINVAL; |
| 293 | } |
| 294 | |
Jeff Cody | d6fcdf0 | 2017-04-07 16:55:27 -0400 | [diff] [blame] | 295 | /* Do not clear read_only if it is prohibited */ |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 296 | if (!read_only && !(bs->open_flags & BDRV_O_ALLOW_RDWR) && |
| 297 | !ignore_allow_rdw) |
| 298 | { |
Jeff Cody | d6fcdf0 | 2017-04-07 16:55:27 -0400 | [diff] [blame] | 299 | error_setg(errp, "Node '%s' is read only", |
| 300 | bdrv_get_device_or_node_name(bs)); |
| 301 | return -EPERM; |
| 302 | } |
| 303 | |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 304 | return 0; |
| 305 | } |
| 306 | |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 307 | /* |
| 308 | * Called by a driver that can only provide a read-only image. |
| 309 | * |
| 310 | * Returns 0 if the node is already read-only or it could switch the node to |
| 311 | * read-only because BDRV_O_AUTO_RDONLY is set. |
| 312 | * |
| 313 | * Returns -EACCES if the node is read-write and BDRV_O_AUTO_RDONLY is not set |
| 314 | * or bdrv_can_set_read_only() forbids making the node read-only. If @errmsg |
| 315 | * is not NULL, it is used as the error message for the Error object. |
| 316 | */ |
| 317 | int bdrv_apply_auto_read_only(BlockDriverState *bs, const char *errmsg, |
| 318 | Error **errp) |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 319 | { |
| 320 | int ret = 0; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 321 | IO_CODE(); |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 322 | |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 323 | if (!(bs->open_flags & BDRV_O_RDWR)) { |
| 324 | return 0; |
| 325 | } |
| 326 | if (!(bs->open_flags & BDRV_O_AUTO_RDONLY)) { |
| 327 | goto fail; |
| 328 | } |
| 329 | |
| 330 | ret = bdrv_can_set_read_only(bs, true, false, NULL); |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 331 | if (ret < 0) { |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 332 | goto fail; |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 333 | } |
| 334 | |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 335 | bs->open_flags &= ~BDRV_O_RDWR; |
Kevin Wolf | eeae6a5 | 2018-10-09 16:57:12 +0200 | [diff] [blame] | 336 | |
Jeff Cody | e2b8247 | 2017-04-07 16:55:26 -0400 | [diff] [blame] | 337 | return 0; |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 338 | |
| 339 | fail: |
| 340 | error_setg(errp, "%s", errmsg ?: "Image is read-only"); |
| 341 | return -EACCES; |
Jeff Cody | fe5241b | 2017-04-07 16:55:25 -0400 | [diff] [blame] | 342 | } |
| 343 | |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 344 | /* |
| 345 | * If @backing is empty, this function returns NULL without setting |
| 346 | * @errp. In all other cases, NULL will only be returned with @errp |
| 347 | * set. |
| 348 | * |
| 349 | * Therefore, a return value of NULL without @errp set means that |
| 350 | * there is no backing file; if @errp is set, there is one but its |
| 351 | * absolute filename cannot be generated. |
| 352 | */ |
| 353 | char *bdrv_get_full_backing_filename_from_filename(const char *backed, |
| 354 | const char *backing, |
| 355 | Error **errp) |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 356 | { |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 357 | if (backing[0] == '\0') { |
| 358 | return NULL; |
| 359 | } else if (path_has_protocol(backing) || path_is_absolute(backing)) { |
| 360 | return g_strdup(backing); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 361 | } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) { |
| 362 | error_setg(errp, "Cannot use relative backing file names for '%s'", |
| 363 | backed); |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 364 | return NULL; |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 365 | } else { |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 366 | return path_combine(backed, backing); |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 367 | } |
| 368 | } |
| 369 | |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 370 | /* |
| 371 | * If @filename is empty or NULL, this function returns NULL without |
| 372 | * setting @errp. In all other cases, NULL will only be returned with |
| 373 | * @errp set. |
| 374 | */ |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 375 | static char * GRAPH_RDLOCK |
| 376 | bdrv_make_absolute_filename(BlockDriverState *relative_to, |
| 377 | const char *filename, Error **errp) |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 378 | { |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 379 | char *dir, *full_name; |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 380 | |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 381 | if (!filename || filename[0] == '\0') { |
| 382 | return NULL; |
| 383 | } else if (path_has_protocol(filename) || path_is_absolute(filename)) { |
| 384 | return g_strdup(filename); |
| 385 | } |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 386 | |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 387 | dir = bdrv_dirname(relative_to, errp); |
| 388 | if (!dir) { |
| 389 | return NULL; |
| 390 | } |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 391 | |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 392 | full_name = g_strconcat(dir, filename, NULL); |
| 393 | g_free(dir); |
| 394 | return full_name; |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 395 | } |
| 396 | |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 397 | char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp) |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 398 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 399 | GLOBAL_STATE_CODE(); |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 400 | return bdrv_make_absolute_filename(bs, bs->backing_file, errp); |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 401 | } |
| 402 | |
Stefan Hajnoczi | 0eb7217 | 2015-04-28 14:27:51 +0100 | [diff] [blame] | 403 | void bdrv_register(BlockDriver *bdrv) |
| 404 | { |
Philippe Mathieu-Daudé | a15f08d | 2020-03-18 23:22:35 +0100 | [diff] [blame] | 405 | assert(bdrv->format_name); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 406 | GLOBAL_STATE_CODE(); |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 407 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 408 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 409 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 410 | BlockDriverState *bdrv_new(void) |
| 411 | { |
| 412 | BlockDriverState *bs; |
| 413 | int i; |
| 414 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 415 | GLOBAL_STATE_CODE(); |
| 416 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 417 | bs = g_new0(BlockDriverState, 1); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 418 | QLIST_INIT(&bs->dirty_bitmaps); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 419 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 420 | QLIST_INIT(&bs->op_blockers[i]); |
| 421 | } |
Stefan Hajnoczi | fa9185f | 2023-08-08 11:58:52 -0400 | [diff] [blame] | 422 | qemu_mutex_init(&bs->reqs_lock); |
Paolo Bonzini | 2119882 | 2017-06-05 14:39:03 +0200 | [diff] [blame] | 423 | qemu_mutex_init(&bs->dirty_bitmap_mutex); |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 424 | bs->refcnt = 1; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 425 | bs->aio_context = qemu_get_aio_context(); |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 426 | |
Evgeny Yakovlev | 3ff2f67 | 2016-07-18 22:39:52 +0300 | [diff] [blame] | 427 | qemu_co_queue_init(&bs->flush_queue); |
| 428 | |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 429 | qemu_co_mutex_init(&bs->bsc_modify_lock); |
| 430 | bs->block_status_cache = g_new0(BdrvBlockStatusCache, 1); |
| 431 | |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 432 | for (i = 0; i < bdrv_drain_all_count; i++) { |
| 433 | bdrv_drained_begin(bs); |
| 434 | } |
| 435 | |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 436 | QTAILQ_INSERT_TAIL(&all_bdrv_states, bs, bs_list); |
| 437 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 438 | return bs; |
| 439 | } |
| 440 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 441 | static BlockDriver *bdrv_do_find_format(const char *format_name) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 442 | { |
| 443 | BlockDriver *drv1; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 444 | GLOBAL_STATE_CODE(); |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 445 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 446 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 447 | if (!strcmp(drv1->format_name, format_name)) { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 448 | return drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 449 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 450 | } |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 451 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 452 | return NULL; |
| 453 | } |
| 454 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 455 | BlockDriver *bdrv_find_format(const char *format_name) |
| 456 | { |
| 457 | BlockDriver *drv1; |
| 458 | int i; |
| 459 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 460 | GLOBAL_STATE_CODE(); |
| 461 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 462 | drv1 = bdrv_do_find_format(format_name); |
| 463 | if (drv1) { |
| 464 | return drv1; |
| 465 | } |
| 466 | |
| 467 | /* The driver isn't registered, maybe we need to load a module */ |
| 468 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { |
| 469 | if (!strcmp(block_driver_modules[i].format_name, format_name)) { |
Claudio Fontana | c551fb0 | 2022-09-29 11:30:33 +0200 | [diff] [blame] | 470 | Error *local_err = NULL; |
| 471 | int rv = block_module_load(block_driver_modules[i].library_name, |
| 472 | &local_err); |
| 473 | if (rv > 0) { |
| 474 | return bdrv_do_find_format(format_name); |
| 475 | } else if (rv < 0) { |
| 476 | error_report_err(local_err); |
| 477 | } |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 478 | break; |
| 479 | } |
| 480 | } |
Claudio Fontana | c551fb0 | 2022-09-29 11:30:33 +0200 | [diff] [blame] | 481 | return NULL; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 482 | } |
| 483 | |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 484 | 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] | 485 | { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 486 | static const char *whitelist_rw[] = { |
| 487 | CONFIG_BDRV_RW_WHITELIST |
Paolo Bonzini | 859aef0 | 2020-08-04 18:14:26 +0200 | [diff] [blame] | 488 | NULL |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 489 | }; |
| 490 | static const char *whitelist_ro[] = { |
| 491 | CONFIG_BDRV_RO_WHITELIST |
Paolo Bonzini | 859aef0 | 2020-08-04 18:14:26 +0200 | [diff] [blame] | 492 | NULL |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 493 | }; |
| 494 | const char **p; |
| 495 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 496 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 497 | return 1; /* no whitelist, anything goes */ |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 498 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 499 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 500 | for (p = whitelist_rw; *p; p++) { |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 501 | if (!strcmp(format_name, *p)) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 502 | return 1; |
| 503 | } |
| 504 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 505 | if (read_only) { |
| 506 | for (p = whitelist_ro; *p; p++) { |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 507 | if (!strcmp(format_name, *p)) { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 508 | return 1; |
| 509 | } |
| 510 | } |
| 511 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 512 | return 0; |
| 513 | } |
| 514 | |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 515 | int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
| 516 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 517 | GLOBAL_STATE_CODE(); |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 518 | return bdrv_format_is_whitelisted(drv->format_name, read_only); |
| 519 | } |
| 520 | |
Daniel P. Berrange | e6ff69b | 2016-03-21 14:11:48 +0000 | [diff] [blame] | 521 | bool bdrv_uses_whitelist(void) |
| 522 | { |
| 523 | return use_bdrv_whitelist; |
| 524 | } |
| 525 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 526 | typedef struct CreateCo { |
| 527 | BlockDriver *drv; |
| 528 | char *filename; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 529 | QemuOpts *opts; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 530 | int ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 531 | Error *err; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 532 | } CreateCo; |
| 533 | |
Emanuele Giuseppe Esposito | 741443e | 2022-11-28 09:23:36 -0500 | [diff] [blame] | 534 | int coroutine_fn bdrv_co_create(BlockDriver *drv, const char *filename, |
| 535 | QemuOpts *opts, Error **errp) |
Emanuele Giuseppe Esposito | 84bdf21 | 2022-11-28 09:23:30 -0500 | [diff] [blame] | 536 | { |
| 537 | int ret; |
| 538 | GLOBAL_STATE_CODE(); |
| 539 | ERRP_GUARD(); |
| 540 | |
| 541 | if (!drv->bdrv_co_create_opts) { |
| 542 | error_setg(errp, "Driver '%s' does not support image creation", |
| 543 | drv->format_name); |
| 544 | return -ENOTSUP; |
| 545 | } |
| 546 | |
| 547 | ret = drv->bdrv_co_create_opts(drv, filename, opts, errp); |
| 548 | if (ret < 0 && !*errp) { |
| 549 | error_setg_errno(errp, -ret, "Could not create image"); |
| 550 | } |
| 551 | |
| 552 | return ret; |
| 553 | } |
| 554 | |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 555 | /** |
| 556 | * Helper function for bdrv_create_file_fallback(): Resize @blk to at |
| 557 | * least the given @minimum_size. |
| 558 | * |
| 559 | * On success, return @blk's actual length. |
| 560 | * Otherwise, return -errno. |
| 561 | */ |
Paolo Bonzini | 84569a7 | 2023-06-01 13:51:38 +0200 | [diff] [blame] | 562 | static int64_t coroutine_fn GRAPH_UNLOCKED |
| 563 | create_file_fallback_truncate(BlockBackend *blk, int64_t minimum_size, |
| 564 | Error **errp) |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 565 | { |
| 566 | Error *local_err = NULL; |
| 567 | int64_t size; |
| 568 | int ret; |
| 569 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 570 | GLOBAL_STATE_CODE(); |
| 571 | |
Paolo Bonzini | 84569a7 | 2023-06-01 13:51:38 +0200 | [diff] [blame] | 572 | ret = blk_co_truncate(blk, minimum_size, false, PREALLOC_MODE_OFF, 0, |
| 573 | &local_err); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 574 | if (ret < 0 && ret != -ENOTSUP) { |
| 575 | error_propagate(errp, local_err); |
| 576 | return ret; |
| 577 | } |
| 578 | |
Paolo Bonzini | 84569a7 | 2023-06-01 13:51:38 +0200 | [diff] [blame] | 579 | size = blk_co_getlength(blk); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 580 | if (size < 0) { |
| 581 | error_free(local_err); |
| 582 | error_setg_errno(errp, -size, |
| 583 | "Failed to inquire the new image file's length"); |
| 584 | return size; |
| 585 | } |
| 586 | |
| 587 | if (size < minimum_size) { |
| 588 | /* Need to grow the image, but we failed to do that */ |
| 589 | error_propagate(errp, local_err); |
| 590 | return -ENOTSUP; |
| 591 | } |
| 592 | |
| 593 | error_free(local_err); |
| 594 | local_err = NULL; |
| 595 | |
| 596 | return size; |
| 597 | } |
| 598 | |
| 599 | /** |
| 600 | * Helper function for bdrv_create_file_fallback(): Zero the first |
| 601 | * sector to remove any potentially pre-existing image header. |
| 602 | */ |
Paolo Bonzini | 881a4c5 | 2022-09-22 10:49:00 +0200 | [diff] [blame] | 603 | static int coroutine_fn |
| 604 | create_file_fallback_zero_first_sector(BlockBackend *blk, |
| 605 | int64_t current_size, |
| 606 | Error **errp) |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 607 | { |
| 608 | int64_t bytes_to_clear; |
| 609 | int ret; |
| 610 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 611 | GLOBAL_STATE_CODE(); |
| 612 | |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 613 | bytes_to_clear = MIN(current_size, BDRV_SECTOR_SIZE); |
| 614 | if (bytes_to_clear) { |
Alberto Faria | ce47ff2 | 2022-10-13 14:37:02 +0200 | [diff] [blame] | 615 | 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] | 616 | if (ret < 0) { |
| 617 | error_setg_errno(errp, -ret, |
| 618 | "Failed to clear the new image's first sector"); |
| 619 | return ret; |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | return 0; |
| 624 | } |
| 625 | |
Maxim Levitsky | 5a5e7f8 | 2020-03-26 03:12:18 +0200 | [diff] [blame] | 626 | /** |
| 627 | * Simple implementation of bdrv_co_create_opts for protocol drivers |
| 628 | * which only support creation via opening a file |
| 629 | * (usually existing raw storage device) |
| 630 | */ |
| 631 | int coroutine_fn bdrv_co_create_opts_simple(BlockDriver *drv, |
| 632 | const char *filename, |
| 633 | QemuOpts *opts, |
| 634 | Error **errp) |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 635 | { |
| 636 | BlockBackend *blk; |
Max Reitz | eeea1fa | 2020-02-25 16:56:18 +0100 | [diff] [blame] | 637 | QDict *options; |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 638 | int64_t size = 0; |
| 639 | char *buf = NULL; |
| 640 | PreallocMode prealloc; |
| 641 | Error *local_err = NULL; |
| 642 | int ret; |
| 643 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 644 | GLOBAL_STATE_CODE(); |
| 645 | |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 646 | size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); |
| 647 | buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); |
| 648 | prealloc = qapi_enum_parse(&PreallocMode_lookup, buf, |
| 649 | PREALLOC_MODE_OFF, &local_err); |
| 650 | g_free(buf); |
| 651 | if (local_err) { |
| 652 | error_propagate(errp, local_err); |
| 653 | return -EINVAL; |
| 654 | } |
| 655 | |
| 656 | if (prealloc != PREALLOC_MODE_OFF) { |
| 657 | error_setg(errp, "Unsupported preallocation mode '%s'", |
| 658 | PreallocMode_str(prealloc)); |
| 659 | return -ENOTSUP; |
| 660 | } |
| 661 | |
Max Reitz | eeea1fa | 2020-02-25 16:56:18 +0100 | [diff] [blame] | 662 | options = qdict_new(); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 663 | qdict_put_str(options, "driver", drv->format_name); |
| 664 | |
Kevin Wolf | be1a732 | 2023-01-26 18:24:31 +0100 | [diff] [blame] | 665 | blk = blk_co_new_open(filename, NULL, options, |
| 666 | BDRV_O_RDWR | BDRV_O_RESIZE, errp); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 667 | if (!blk) { |
Hanna Czenczek | 8162486 | 2023-07-20 16:00:24 +0200 | [diff] [blame] | 668 | error_prepend(errp, "Protocol driver '%s' does not support creating " |
| 669 | "new images, so an existing image must be selected as " |
| 670 | "the target; however, opening the given target as an " |
| 671 | "existing image failed: ", |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 672 | drv->format_name); |
| 673 | return -EINVAL; |
| 674 | } |
| 675 | |
| 676 | size = create_file_fallback_truncate(blk, size, errp); |
| 677 | if (size < 0) { |
| 678 | ret = size; |
| 679 | goto out; |
| 680 | } |
| 681 | |
| 682 | ret = create_file_fallback_zero_first_sector(blk, size, errp); |
| 683 | if (ret < 0) { |
| 684 | goto out; |
| 685 | } |
| 686 | |
| 687 | ret = 0; |
| 688 | out: |
Kevin Wolf | b2ab5f5 | 2023-05-04 13:57:33 +0200 | [diff] [blame] | 689 | blk_co_unref(blk); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 690 | return ret; |
| 691 | } |
| 692 | |
Emanuele Giuseppe Esposito | 2475a0d | 2022-11-28 09:23:31 -0500 | [diff] [blame] | 693 | int coroutine_fn bdrv_co_create_file(const char *filename, QemuOpts *opts, |
| 694 | Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 695 | { |
Stefano Garzarella | 729222a | 2021-03-08 17:12:32 +0100 | [diff] [blame] | 696 | QemuOpts *protocol_opts; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 697 | BlockDriver *drv; |
Stefano Garzarella | 729222a | 2021-03-08 17:12:32 +0100 | [diff] [blame] | 698 | QDict *qdict; |
| 699 | int ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 700 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 701 | GLOBAL_STATE_CODE(); |
| 702 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 703 | drv = bdrv_find_protocol(filename, true, errp); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 704 | if (drv == NULL) { |
Stefan Hajnoczi | 16905d7 | 2010-11-30 15:14:14 +0000 | [diff] [blame] | 705 | return -ENOENT; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 706 | } |
| 707 | |
Stefano Garzarella | 729222a | 2021-03-08 17:12:32 +0100 | [diff] [blame] | 708 | if (!drv->create_opts) { |
| 709 | error_setg(errp, "Driver '%s' does not support image creation", |
| 710 | drv->format_name); |
| 711 | return -ENOTSUP; |
| 712 | } |
| 713 | |
| 714 | /* |
| 715 | * 'opts' contains a QemuOptsList with a combination of format and protocol |
| 716 | * default values. |
| 717 | * |
| 718 | * The format properly removes its options, but the default values remain |
| 719 | * in 'opts->list'. So if the protocol has options with the same name |
| 720 | * (e.g. rbd has 'cluster_size' as qcow2), it will see the default values |
| 721 | * of the format, since for overlapping options, the format wins. |
| 722 | * |
| 723 | * To avoid this issue, lets convert QemuOpts to QDict, in this way we take |
| 724 | * only the set options, and then convert it back to QemuOpts, using the |
| 725 | * create_opts of the protocol. So the new QemuOpts, will contain only the |
| 726 | * protocol defaults. |
| 727 | */ |
| 728 | qdict = qemu_opts_to_qdict(opts, NULL); |
| 729 | protocol_opts = qemu_opts_from_qdict(drv->create_opts, qdict, errp); |
| 730 | if (protocol_opts == NULL) { |
| 731 | ret = -EINVAL; |
| 732 | goto out; |
| 733 | } |
| 734 | |
Emanuele Giuseppe Esposito | 2475a0d | 2022-11-28 09:23:31 -0500 | [diff] [blame] | 735 | ret = bdrv_co_create(drv, filename, protocol_opts, errp); |
Stefano Garzarella | 729222a | 2021-03-08 17:12:32 +0100 | [diff] [blame] | 736 | out: |
| 737 | qemu_opts_del(protocol_opts); |
| 738 | qobject_unref(qdict); |
| 739 | return ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 740 | } |
| 741 | |
Daniel Henrique Barboza | e1d7f8b | 2020-01-30 18:39:05 -0300 | [diff] [blame] | 742 | int coroutine_fn bdrv_co_delete_file(BlockDriverState *bs, Error **errp) |
| 743 | { |
| 744 | Error *local_err = NULL; |
| 745 | int ret; |
| 746 | |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 747 | IO_CODE(); |
Daniel Henrique Barboza | e1d7f8b | 2020-01-30 18:39:05 -0300 | [diff] [blame] | 748 | assert(bs != NULL); |
Kevin Wolf | 48aef79 | 2023-02-03 16:22:00 +0100 | [diff] [blame] | 749 | assert_bdrv_graph_readable(); |
Daniel Henrique Barboza | e1d7f8b | 2020-01-30 18:39:05 -0300 | [diff] [blame] | 750 | |
| 751 | if (!bs->drv) { |
| 752 | error_setg(errp, "Block node '%s' is not opened", bs->filename); |
| 753 | return -ENOMEDIUM; |
| 754 | } |
| 755 | |
| 756 | if (!bs->drv->bdrv_co_delete_file) { |
| 757 | error_setg(errp, "Driver '%s' does not support image deletion", |
| 758 | bs->drv->format_name); |
| 759 | return -ENOTSUP; |
| 760 | } |
| 761 | |
| 762 | ret = bs->drv->bdrv_co_delete_file(bs, &local_err); |
| 763 | if (ret < 0) { |
| 764 | error_propagate(errp, local_err); |
| 765 | } |
| 766 | |
| 767 | return ret; |
| 768 | } |
| 769 | |
Maxim Levitsky | a890f08 | 2020-12-17 19:09:03 +0200 | [diff] [blame] | 770 | void coroutine_fn bdrv_co_delete_file_noerr(BlockDriverState *bs) |
| 771 | { |
| 772 | Error *local_err = NULL; |
| 773 | int ret; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 774 | IO_CODE(); |
Maxim Levitsky | a890f08 | 2020-12-17 19:09:03 +0200 | [diff] [blame] | 775 | |
| 776 | if (!bs) { |
| 777 | return; |
| 778 | } |
| 779 | |
| 780 | ret = bdrv_co_delete_file(bs, &local_err); |
| 781 | /* |
| 782 | * ENOTSUP will happen if the block driver doesn't support |
| 783 | * the 'bdrv_co_delete_file' interface. This is a predictable |
| 784 | * scenario and shouldn't be reported back to the user. |
| 785 | */ |
| 786 | if (ret == -ENOTSUP) { |
| 787 | error_free(local_err); |
| 788 | } else if (ret < 0) { |
| 789 | error_report_err(local_err); |
| 790 | } |
| 791 | } |
| 792 | |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 793 | /** |
| 794 | * Try to get @bs's logical and physical block size. |
| 795 | * On success, store them in @bsz struct and return 0. |
| 796 | * On failure return -errno. |
| 797 | * @bs must not be empty. |
| 798 | */ |
| 799 | int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) |
| 800 | { |
| 801 | BlockDriver *drv = bs->drv; |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 802 | BlockDriverState *filtered = bdrv_filter_bs(bs); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 803 | GLOBAL_STATE_CODE(); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 804 | |
| 805 | if (drv && drv->bdrv_probe_blocksizes) { |
| 806 | return drv->bdrv_probe_blocksizes(bs, bsz); |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 807 | } else if (filtered) { |
| 808 | return bdrv_probe_blocksizes(filtered, bsz); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 809 | } |
| 810 | |
| 811 | return -ENOTSUP; |
| 812 | } |
| 813 | |
| 814 | /** |
| 815 | * Try to get @bs's geometry (cyls, heads, sectors). |
| 816 | * On success, store them in @geo struct and return 0. |
| 817 | * On failure return -errno. |
| 818 | * @bs must not be empty. |
| 819 | */ |
| 820 | int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo) |
| 821 | { |
| 822 | BlockDriver *drv = bs->drv; |
Kevin Wolf | f5a3a27 | 2023-10-27 17:53:12 +0200 | [diff] [blame] | 823 | BlockDriverState *filtered; |
| 824 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 825 | GLOBAL_STATE_CODE(); |
Kevin Wolf | f5a3a27 | 2023-10-27 17:53:12 +0200 | [diff] [blame] | 826 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 827 | |
| 828 | if (drv && drv->bdrv_probe_geometry) { |
| 829 | return drv->bdrv_probe_geometry(bs, geo); |
Kevin Wolf | f5a3a27 | 2023-10-27 17:53:12 +0200 | [diff] [blame] | 830 | } |
| 831 | |
| 832 | filtered = bdrv_filter_bs(bs); |
| 833 | if (filtered) { |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 834 | return bdrv_probe_geometry(filtered, geo); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 835 | } |
| 836 | |
| 837 | return -ENOTSUP; |
| 838 | } |
| 839 | |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 840 | /* |
| 841 | * Create a uniquely-named empty temporary file. |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 842 | * Return the actual file name used upon success, otherwise NULL. |
| 843 | * This string should be freed with g_free() when not needed any longer. |
| 844 | * |
| 845 | * Note: creating a temporary file for the caller to (re)open is |
| 846 | * inherently racy. Use g_file_open_tmp() instead whenever practical. |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 847 | */ |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 848 | char *create_tmp_file(Error **errp) |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 849 | { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 850 | int fd; |
blueswir1 | 7ccfb2e | 2008-09-14 06:45:34 +0000 | [diff] [blame] | 851 | const char *tmpdir; |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 852 | g_autofree char *filename = NULL; |
| 853 | |
| 854 | tmpdir = g_get_tmp_dir(); |
| 855 | #ifndef _WIN32 |
| 856 | /* |
| 857 | * See commit 69bef79 ("block: use /var/tmp instead of /tmp for -snapshot") |
| 858 | * |
| 859 | * This function is used to create temporary disk images (like -snapshot), |
| 860 | * so the files can become very large. /tmp is often a tmpfs where as |
| 861 | * /var/tmp is usually on a disk, so more appropriate for disk images. |
| 862 | */ |
| 863 | if (!g_strcmp0(tmpdir, "/tmp")) { |
Amit Shah | 69bef79 | 2014-02-26 15:12:37 +0530 | [diff] [blame] | 864 | tmpdir = "/var/tmp"; |
| 865 | } |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 866 | #endif |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 867 | |
| 868 | filename = g_strdup_printf("%s/vl.XXXXXX", tmpdir); |
| 869 | fd = g_mkstemp(filename); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 870 | if (fd < 0) { |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 871 | error_setg_errno(errp, errno, "Could not open temporary file '%s'", |
| 872 | filename); |
| 873 | return NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 874 | } |
Bin Meng | 6b6471e | 2022-10-10 12:04:30 +0800 | [diff] [blame] | 875 | close(fd); |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 876 | |
| 877 | return g_steal_pointer(&filename); |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 878 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 879 | |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 880 | /* |
| 881 | * Detect host devices. By convention, /dev/cdrom[N] is always |
| 882 | * recognized as a host CDROM. |
| 883 | */ |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 884 | static BlockDriver *find_hdev_driver(const char *filename) |
| 885 | { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 886 | int score_max = 0, score; |
| 887 | BlockDriver *drv = NULL, *d; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 888 | GLOBAL_STATE_CODE(); |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 889 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 890 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 891 | if (d->bdrv_probe_device) { |
| 892 | score = d->bdrv_probe_device(filename); |
| 893 | if (score > score_max) { |
| 894 | score_max = score; |
| 895 | drv = d; |
| 896 | } |
| 897 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 898 | } |
| 899 | |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 900 | return drv; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 901 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 902 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 903 | static BlockDriver *bdrv_do_find_protocol(const char *protocol) |
| 904 | { |
| 905 | BlockDriver *drv1; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 906 | GLOBAL_STATE_CODE(); |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 907 | |
| 908 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 909 | if (drv1->protocol_name && !strcmp(drv1->protocol_name, protocol)) { |
| 910 | return drv1; |
| 911 | } |
| 912 | } |
| 913 | |
| 914 | return NULL; |
| 915 | } |
| 916 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 917 | BlockDriver *bdrv_find_protocol(const char *filename, |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 918 | bool allow_protocol_prefix, |
| 919 | Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 920 | { |
| 921 | BlockDriver *drv1; |
| 922 | char protocol[128]; |
| 923 | int len; |
| 924 | const char *p; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 925 | int i; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 926 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 927 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 928 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
| 929 | |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 930 | /* |
| 931 | * XXX(hch): we really should not let host device detection |
| 932 | * override an explicit protocol specification, but moving this |
| 933 | * later breaks access to device names with colons in them. |
| 934 | * Thanks to the brain-dead persistent naming schemes on udev- |
| 935 | * based Linux systems those actually are quite common. |
| 936 | */ |
| 937 | drv1 = find_hdev_driver(filename); |
| 938 | if (drv1) { |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 939 | return drv1; |
| 940 | } |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 941 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 942 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 943 | return &bdrv_file; |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 944 | } |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 945 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 946 | p = strchr(filename, ':'); |
| 947 | assert(p != NULL); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 948 | len = p - filename; |
| 949 | if (len > sizeof(protocol) - 1) |
| 950 | len = sizeof(protocol) - 1; |
| 951 | memcpy(protocol, filename, len); |
| 952 | protocol[len] = '\0'; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 953 | |
| 954 | drv1 = bdrv_do_find_protocol(protocol); |
| 955 | if (drv1) { |
| 956 | return drv1; |
| 957 | } |
| 958 | |
| 959 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { |
| 960 | if (block_driver_modules[i].protocol_name && |
| 961 | !strcmp(block_driver_modules[i].protocol_name, protocol)) { |
Claudio Fontana | c551fb0 | 2022-09-29 11:30:33 +0200 | [diff] [blame] | 962 | int rv = block_module_load(block_driver_modules[i].library_name, errp); |
| 963 | if (rv > 0) { |
| 964 | drv1 = bdrv_do_find_protocol(protocol); |
| 965 | } else if (rv < 0) { |
| 966 | return NULL; |
| 967 | } |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 968 | break; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 969 | } |
| 970 | } |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 971 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 972 | if (!drv1) { |
| 973 | error_setg(errp, "Unknown protocol '%s'", protocol); |
| 974 | } |
| 975 | return drv1; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 976 | } |
| 977 | |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 978 | /* |
| 979 | * Guess image format by probing its contents. |
| 980 | * This is not a good idea when your image is raw (CVE-2008-2004), but |
| 981 | * we do it anyway for backward compatibility. |
| 982 | * |
| 983 | * @buf contains the image's first @buf_size bytes. |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 984 | * @buf_size is the buffer size in bytes (generally BLOCK_PROBE_BUF_SIZE, |
| 985 | * but can be smaller if the image file is smaller) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 986 | * @filename is its filename. |
| 987 | * |
| 988 | * For all block drivers, call the bdrv_probe() method to get its |
| 989 | * probing score. |
| 990 | * Return the first block driver with the highest probing score. |
| 991 | */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 992 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, |
| 993 | const char *filename) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 994 | { |
| 995 | int score_max = 0, score; |
| 996 | BlockDriver *drv = NULL, *d; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 997 | IO_CODE(); |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 998 | |
| 999 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
| 1000 | if (d->bdrv_probe) { |
| 1001 | score = d->bdrv_probe(buf, buf_size, filename); |
| 1002 | if (score > score_max) { |
| 1003 | score_max = score; |
| 1004 | drv = d; |
| 1005 | } |
| 1006 | } |
| 1007 | } |
| 1008 | |
| 1009 | return drv; |
| 1010 | } |
| 1011 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1012 | static int find_image_format(BlockBackend *file, const char *filename, |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1013 | BlockDriver **pdrv, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1014 | { |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 1015 | BlockDriver *drv; |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 1016 | uint8_t buf[BLOCK_PROBE_BUF_SIZE]; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1017 | int ret = 0; |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 1018 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1019 | GLOBAL_STATE_CODE(); |
| 1020 | |
Kevin Wolf | 08a0055 | 2010-06-01 18:37:31 +0200 | [diff] [blame] | 1021 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1022 | 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] | 1023 | *pdrv = &bdrv_raw; |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1024 | return ret; |
Nicholas A. Bellinger | 1a39685 | 2010-05-27 08:56:28 -0700 | [diff] [blame] | 1025 | } |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 1026 | |
Alberto Faria | a9262f5 | 2022-07-05 17:15:11 +0100 | [diff] [blame] | 1027 | ret = blk_pread(file, 0, sizeof(buf), buf, 0); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 1028 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1029 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
| 1030 | "format"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1031 | *pdrv = NULL; |
| 1032 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 1033 | } |
| 1034 | |
Alberto Faria | bf5b16f | 2022-07-05 17:15:09 +0100 | [diff] [blame] | 1035 | drv = bdrv_probe_all(buf, sizeof(buf), filename); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1036 | if (!drv) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1037 | error_setg(errp, "Could not determine image format: No compatible " |
| 1038 | "driver found"); |
Alberto Faria | bf5b16f | 2022-07-05 17:15:09 +0100 | [diff] [blame] | 1039 | *pdrv = NULL; |
| 1040 | return -ENOENT; |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1041 | } |
Alberto Faria | bf5b16f | 2022-07-05 17:15:09 +0100 | [diff] [blame] | 1042 | |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1043 | *pdrv = drv; |
Alberto Faria | bf5b16f | 2022-07-05 17:15:09 +0100 | [diff] [blame] | 1044 | return 0; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1045 | } |
| 1046 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1047 | /** |
| 1048 | * Set the current 'total_sectors' value |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 1049 | * Return 0 on success, -errno on error. |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1050 | */ |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 1051 | int coroutine_fn bdrv_co_refresh_total_sectors(BlockDriverState *bs, |
| 1052 | int64_t hint) |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1053 | { |
| 1054 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 1055 | IO_CODE(); |
Kevin Wolf | 8ab8140 | 2023-02-03 16:22:02 +0100 | [diff] [blame] | 1056 | assert_bdrv_graph_readable(); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1057 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 1058 | if (!drv) { |
| 1059 | return -ENOMEDIUM; |
| 1060 | } |
| 1061 | |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 1062 | /* Do not attempt drv->bdrv_co_getlength() on scsi-generic devices */ |
Dimitris Aragiorgis | b192af8 | 2015-06-23 13:44:56 +0300 | [diff] [blame] | 1063 | if (bdrv_is_sg(bs)) |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 1064 | return 0; |
| 1065 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1066 | /* query actual device if possible, otherwise just trust the hint */ |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 1067 | if (drv->bdrv_co_getlength) { |
| 1068 | int64_t length = drv->bdrv_co_getlength(bs); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1069 | if (length < 0) { |
| 1070 | return length; |
| 1071 | } |
Fam Zheng | 7e38200 | 2013-11-06 19:48:06 +0800 | [diff] [blame] | 1072 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1073 | } |
| 1074 | |
| 1075 | bs->total_sectors = hint; |
Vladimir Sementsov-Ogievskiy | 8b11700 | 2020-12-04 01:27:13 +0300 | [diff] [blame] | 1076 | |
| 1077 | if (bs->total_sectors * BDRV_SECTOR_SIZE > BDRV_MAX_LENGTH) { |
| 1078 | return -EFBIG; |
| 1079 | } |
| 1080 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1081 | return 0; |
| 1082 | } |
| 1083 | |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1084 | /** |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 1085 | * Combines a QDict of new block driver @options with any missing options taken |
| 1086 | * from @old_options, so that leaving out an option defaults to its old value. |
| 1087 | */ |
| 1088 | static void bdrv_join_options(BlockDriverState *bs, QDict *options, |
| 1089 | QDict *old_options) |
| 1090 | { |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 1091 | GLOBAL_STATE_CODE(); |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 1092 | if (bs->drv && bs->drv->bdrv_join_options) { |
| 1093 | bs->drv->bdrv_join_options(options, old_options); |
| 1094 | } else { |
| 1095 | qdict_join(options, old_options, false); |
| 1096 | } |
| 1097 | } |
| 1098 | |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 1099 | static BlockdevDetectZeroesOptions bdrv_parse_detect_zeroes(QemuOpts *opts, |
| 1100 | int open_flags, |
| 1101 | Error **errp) |
| 1102 | { |
| 1103 | Error *local_err = NULL; |
| 1104 | char *value = qemu_opt_get_del(opts, "detect-zeroes"); |
| 1105 | BlockdevDetectZeroesOptions detect_zeroes = |
| 1106 | qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, value, |
| 1107 | BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, &local_err); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1108 | GLOBAL_STATE_CODE(); |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 1109 | g_free(value); |
| 1110 | if (local_err) { |
| 1111 | error_propagate(errp, local_err); |
| 1112 | return detect_zeroes; |
| 1113 | } |
| 1114 | |
| 1115 | if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && |
| 1116 | !(open_flags & BDRV_O_UNMAP)) |
| 1117 | { |
| 1118 | error_setg(errp, "setting detect-zeroes to unmap is not allowed " |
| 1119 | "without setting discard operation to unmap"); |
| 1120 | } |
| 1121 | |
| 1122 | return detect_zeroes; |
| 1123 | } |
| 1124 | |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 1125 | /** |
Aarushi Mehta | f80f267 | 2020-01-20 14:18:50 +0000 | [diff] [blame] | 1126 | * Set open flags for aio engine |
| 1127 | * |
| 1128 | * Return 0 on success, -1 if the engine specified is invalid |
| 1129 | */ |
| 1130 | int bdrv_parse_aio(const char *mode, int *flags) |
| 1131 | { |
| 1132 | if (!strcmp(mode, "threads")) { |
| 1133 | /* do nothing, default */ |
| 1134 | } else if (!strcmp(mode, "native")) { |
| 1135 | *flags |= BDRV_O_NATIVE_AIO; |
| 1136 | #ifdef CONFIG_LINUX_IO_URING |
| 1137 | } else if (!strcmp(mode, "io_uring")) { |
| 1138 | *flags |= BDRV_O_IO_URING; |
| 1139 | #endif |
| 1140 | } else { |
| 1141 | return -1; |
| 1142 | } |
| 1143 | |
| 1144 | return 0; |
| 1145 | } |
| 1146 | |
| 1147 | /** |
Paolo Bonzini | 9e8f183 | 2013-02-08 14:06:11 +0100 | [diff] [blame] | 1148 | * Set open flags for a given discard mode |
| 1149 | * |
| 1150 | * Return 0 on success, -1 if the discard mode was invalid. |
| 1151 | */ |
| 1152 | int bdrv_parse_discard_flags(const char *mode, int *flags) |
| 1153 | { |
| 1154 | *flags &= ~BDRV_O_UNMAP; |
| 1155 | |
| 1156 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { |
| 1157 | /* do nothing */ |
| 1158 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { |
| 1159 | *flags |= BDRV_O_UNMAP; |
| 1160 | } else { |
| 1161 | return -1; |
| 1162 | } |
| 1163 | |
| 1164 | return 0; |
| 1165 | } |
| 1166 | |
| 1167 | /** |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1168 | * Set open flags for a given cache mode |
| 1169 | * |
| 1170 | * Return 0 on success, -1 if the cache mode was invalid. |
| 1171 | */ |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1172 | int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough) |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1173 | { |
| 1174 | *flags &= ~BDRV_O_CACHE_MASK; |
| 1175 | |
| 1176 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1177 | *writethrough = false; |
| 1178 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 1179 | } else if (!strcmp(mode, "directsync")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1180 | *writethrough = true; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 1181 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1182 | } else if (!strcmp(mode, "writeback")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1183 | *writethrough = false; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1184 | } else if (!strcmp(mode, "unsafe")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1185 | *writethrough = false; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1186 | *flags |= BDRV_O_NO_FLUSH; |
| 1187 | } else if (!strcmp(mode, "writethrough")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1188 | *writethrough = true; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1189 | } else { |
| 1190 | return -1; |
| 1191 | } |
| 1192 | |
| 1193 | return 0; |
| 1194 | } |
| 1195 | |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 1196 | static char *bdrv_child_get_parent_desc(BdrvChild *c) |
| 1197 | { |
| 1198 | BlockDriverState *parent = c->opaque; |
Vladimir Sementsov-Ogievskiy | 2c0a3ac | 2021-06-01 10:52:15 +0300 | [diff] [blame] | 1199 | return g_strdup_printf("node '%s'", bdrv_get_node_name(parent)); |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 1200 | } |
| 1201 | |
Emanuele Giuseppe Esposito | d05ab38 | 2023-09-29 16:51:40 +0200 | [diff] [blame] | 1202 | static void GRAPH_RDLOCK bdrv_child_cb_drained_begin(BdrvChild *child) |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1203 | { |
| 1204 | BlockDriverState *bs = child->opaque; |
Kevin Wolf | a82a3bd | 2022-11-18 18:41:07 +0100 | [diff] [blame] | 1205 | bdrv_do_drained_begin_quiesce(bs, NULL); |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1206 | } |
| 1207 | |
Emanuele Giuseppe Esposito | d05ab38 | 2023-09-29 16:51:40 +0200 | [diff] [blame] | 1208 | static bool GRAPH_RDLOCK bdrv_child_cb_drained_poll(BdrvChild *child) |
Kevin Wolf | 89bd030 | 2018-03-22 14:11:20 +0100 | [diff] [blame] | 1209 | { |
| 1210 | BlockDriverState *bs = child->opaque; |
Kevin Wolf | 299403a | 2022-11-18 18:41:05 +0100 | [diff] [blame] | 1211 | return bdrv_drain_poll(bs, NULL, false); |
Kevin Wolf | 89bd030 | 2018-03-22 14:11:20 +0100 | [diff] [blame] | 1212 | } |
| 1213 | |
Emanuele Giuseppe Esposito | d05ab38 | 2023-09-29 16:51:40 +0200 | [diff] [blame] | 1214 | static void GRAPH_RDLOCK bdrv_child_cb_drained_end(BdrvChild *child) |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1215 | { |
| 1216 | BlockDriverState *bs = child->opaque; |
Kevin Wolf | 2f65df6 | 2022-11-18 18:40:59 +0100 | [diff] [blame] | 1217 | bdrv_drained_end(bs); |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1218 | } |
| 1219 | |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 1220 | static int bdrv_child_cb_inactivate(BdrvChild *child) |
| 1221 | { |
| 1222 | BlockDriverState *bs = child->opaque; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1223 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 1224 | assert(bs->open_flags & BDRV_O_INACTIVE); |
| 1225 | return 0; |
| 1226 | } |
| 1227 | |
Emanuele Giuseppe Esposito | 27633e7 | 2022-10-25 04:49:47 -0400 | [diff] [blame] | 1228 | static bool bdrv_child_cb_change_aio_ctx(BdrvChild *child, AioContext *ctx, |
| 1229 | GHashTable *visited, Transaction *tran, |
| 1230 | Error **errp) |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 1231 | { |
| 1232 | BlockDriverState *bs = child->opaque; |
Emanuele Giuseppe Esposito | 27633e7 | 2022-10-25 04:49:47 -0400 | [diff] [blame] | 1233 | return bdrv_change_aio_context(bs, ctx, visited, tran, errp); |
Kevin Wolf | 53a7d04 | 2019-05-06 19:17:59 +0200 | [diff] [blame] | 1234 | } |
| 1235 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 1236 | /* |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 1237 | * Returns the options and flags that a temporary snapshot should get, based on |
| 1238 | * the originally requested flags (the originally requested image will have |
| 1239 | * flags like a backing file) |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1240 | */ |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 1241 | static void bdrv_temp_snapshot_options(int *child_flags, QDict *child_options, |
| 1242 | int parent_flags, QDict *parent_options) |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1243 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1244 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 1245 | *child_flags = (parent_flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; |
| 1246 | |
| 1247 | /* For temporary files, unconditional cache=unsafe is fine */ |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 1248 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_DIRECT, "off"); |
| 1249 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on"); |
Kevin Wolf | 4186904 | 2016-06-16 12:59:30 +0200 | [diff] [blame] | 1250 | |
Kevin Wolf | 3f48686 | 2019-04-04 17:04:43 +0200 | [diff] [blame] | 1251 | /* Copy the read-only and discard options from the parent */ |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1252 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); |
Kevin Wolf | 3f48686 | 2019-04-04 17:04:43 +0200 | [diff] [blame] | 1253 | qdict_copy_default(child_options, parent_options, BDRV_OPT_DISCARD); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1254 | |
Kevin Wolf | 4186904 | 2016-06-16 12:59:30 +0200 | [diff] [blame] | 1255 | /* aio=native doesn't work for cache.direct=off, so disable it for the |
| 1256 | * temporary snapshot */ |
| 1257 | *child_flags &= ~BDRV_O_NATIVE_AIO; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1258 | } |
| 1259 | |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 1260 | static void GRAPH_WRLOCK bdrv_backing_attach(BdrvChild *c) |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1261 | { |
| 1262 | BlockDriverState *parent = c->opaque; |
| 1263 | BlockDriverState *backing_hd = c->bs; |
| 1264 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1265 | GLOBAL_STATE_CODE(); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1266 | assert(!parent->backing_blocker); |
| 1267 | error_setg(&parent->backing_blocker, |
| 1268 | "node is used as backing hd of '%s'", |
| 1269 | bdrv_get_device_or_node_name(parent)); |
| 1270 | |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 1271 | bdrv_refresh_filename(backing_hd); |
| 1272 | |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1273 | parent->open_flags &= ~BDRV_O_NO_BACKING; |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1274 | |
| 1275 | bdrv_op_block_all(backing_hd, parent->backing_blocker); |
| 1276 | /* Otherwise we won't be able to commit or stream */ |
| 1277 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, |
| 1278 | parent->backing_blocker); |
| 1279 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_STREAM, |
| 1280 | parent->backing_blocker); |
| 1281 | /* |
| 1282 | * We do backup in 3 ways: |
| 1283 | * 1. drive backup |
| 1284 | * The target bs is new opened, and the source is top BDS |
| 1285 | * 2. blockdev backup |
| 1286 | * Both the source and the target are top BDSes. |
| 1287 | * 3. internal backup(used for block replication) |
| 1288 | * Both the source and the target are backing file |
| 1289 | * |
| 1290 | * In case 1 and 2, neither the source nor the target is the backing file. |
| 1291 | * In case 3, we will block the top BDS, so there is only one block job |
| 1292 | * for the top BDS and its backing chain. |
| 1293 | */ |
| 1294 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_SOURCE, |
| 1295 | parent->backing_blocker); |
| 1296 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_TARGET, |
| 1297 | parent->backing_blocker); |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1298 | } |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 1299 | |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1300 | static void bdrv_backing_detach(BdrvChild *c) |
| 1301 | { |
| 1302 | BlockDriverState *parent = c->opaque; |
| 1303 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1304 | GLOBAL_STATE_CODE(); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1305 | assert(parent->backing_blocker); |
| 1306 | bdrv_op_unblock_all(c->bs, parent->backing_blocker); |
| 1307 | error_free(parent->backing_blocker); |
| 1308 | parent->backing_blocker = NULL; |
Max Reitz | 48e0828 | 2020-05-13 13:05:23 +0200 | [diff] [blame] | 1309 | } |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 1310 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1311 | static int bdrv_backing_update_filename(BdrvChild *c, BlockDriverState *base, |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame^] | 1312 | const char *filename, |
| 1313 | bool backing_mask_protocol, |
| 1314 | Error **errp) |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1315 | { |
| 1316 | BlockDriverState *parent = c->opaque; |
Alberto Garcia | e94d3db | 2018-11-12 16:00:34 +0200 | [diff] [blame] | 1317 | bool read_only = bdrv_is_read_only(parent); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1318 | int ret; |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame^] | 1319 | const char *format_name; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1320 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1321 | |
Alberto Garcia | e94d3db | 2018-11-12 16:00:34 +0200 | [diff] [blame] | 1322 | if (read_only) { |
| 1323 | ret = bdrv_reopen_set_read_only(parent, false, errp); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 1324 | if (ret < 0) { |
| 1325 | return ret; |
| 1326 | } |
| 1327 | } |
| 1328 | |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame^] | 1329 | if (base->drv) { |
| 1330 | /* |
| 1331 | * If the new base image doesn't have a format driver layer, which we |
| 1332 | * detect by the fact that @base is a protocol driver, we record |
| 1333 | * 'raw' as the format instead of putting the protocol name as the |
| 1334 | * backing format |
| 1335 | */ |
| 1336 | if (backing_mask_protocol && base->drv->protocol_name) { |
| 1337 | format_name = "raw"; |
| 1338 | } else { |
| 1339 | format_name = base->drv->format_name; |
| 1340 | } |
| 1341 | } else { |
| 1342 | format_name = ""; |
| 1343 | } |
| 1344 | |
| 1345 | ret = bdrv_change_backing_file(parent, filename, format_name, false); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1346 | if (ret < 0) { |
Kevin Wolf | 6473069 | 2017-11-06 17:52:58 +0100 | [diff] [blame] | 1347 | error_setg_errno(errp, -ret, "Could not update backing file link"); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1348 | } |
| 1349 | |
Alberto Garcia | e94d3db | 2018-11-12 16:00:34 +0200 | [diff] [blame] | 1350 | if (read_only) { |
| 1351 | bdrv_reopen_set_read_only(parent, true, NULL); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 1352 | } |
| 1353 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1354 | return ret; |
| 1355 | } |
| 1356 | |
Max Reitz | fae8bd3 | 2020-05-13 13:05:20 +0200 | [diff] [blame] | 1357 | /* |
| 1358 | * Returns the options and flags that a generic child of a BDS should |
| 1359 | * get, based on the given options and flags for the parent BDS. |
| 1360 | */ |
Max Reitz | 00ff7ff | 2020-05-13 13:05:21 +0200 | [diff] [blame] | 1361 | static void bdrv_inherited_options(BdrvChildRole role, bool parent_is_format, |
| 1362 | int *child_flags, QDict *child_options, |
| 1363 | int parent_flags, QDict *parent_options) |
Max Reitz | fae8bd3 | 2020-05-13 13:05:20 +0200 | [diff] [blame] | 1364 | { |
| 1365 | int flags = parent_flags; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1366 | GLOBAL_STATE_CODE(); |
Max Reitz | fae8bd3 | 2020-05-13 13:05:20 +0200 | [diff] [blame] | 1367 | |
| 1368 | /* |
| 1369 | * First, decide whether to set, clear, or leave BDRV_O_PROTOCOL. |
| 1370 | * Generally, the question to answer is: Should this child be |
| 1371 | * format-probed by default? |
| 1372 | */ |
| 1373 | |
| 1374 | /* |
| 1375 | * Pure and non-filtered data children of non-format nodes should |
| 1376 | * be probed by default (even when the node itself has BDRV_O_PROTOCOL |
| 1377 | * set). This only affects a very limited set of drivers (namely |
| 1378 | * quorum and blkverify when this comment was written). |
| 1379 | * Force-clear BDRV_O_PROTOCOL then. |
| 1380 | */ |
| 1381 | if (!parent_is_format && |
| 1382 | (role & BDRV_CHILD_DATA) && |
| 1383 | !(role & (BDRV_CHILD_METADATA | BDRV_CHILD_FILTERED))) |
| 1384 | { |
| 1385 | flags &= ~BDRV_O_PROTOCOL; |
| 1386 | } |
| 1387 | |
| 1388 | /* |
| 1389 | * All children of format nodes (except for COW children) and all |
| 1390 | * metadata children in general should never be format-probed. |
| 1391 | * Force-set BDRV_O_PROTOCOL then. |
| 1392 | */ |
| 1393 | if ((parent_is_format && !(role & BDRV_CHILD_COW)) || |
| 1394 | (role & BDRV_CHILD_METADATA)) |
| 1395 | { |
| 1396 | flags |= BDRV_O_PROTOCOL; |
| 1397 | } |
| 1398 | |
| 1399 | /* |
| 1400 | * If the cache mode isn't explicitly set, inherit direct and no-flush from |
| 1401 | * the parent. |
| 1402 | */ |
| 1403 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); |
| 1404 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); |
| 1405 | qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE); |
| 1406 | |
| 1407 | if (role & BDRV_CHILD_COW) { |
| 1408 | /* backing files are opened read-only by default */ |
| 1409 | qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "on"); |
| 1410 | qdict_set_default_str(child_options, BDRV_OPT_AUTO_READ_ONLY, "off"); |
| 1411 | } else { |
| 1412 | /* Inherit the read-only option from the parent if it's not set */ |
| 1413 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); |
| 1414 | qdict_copy_default(child_options, parent_options, |
| 1415 | BDRV_OPT_AUTO_READ_ONLY); |
| 1416 | } |
| 1417 | |
| 1418 | /* |
| 1419 | * bdrv_co_pdiscard() respects unmap policy for the parent, so we |
| 1420 | * can default to enable it on lower layers regardless of the |
| 1421 | * parent option. |
| 1422 | */ |
| 1423 | qdict_set_default_str(child_options, BDRV_OPT_DISCARD, "unmap"); |
| 1424 | |
| 1425 | /* Clear flags that only apply to the top layer */ |
| 1426 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); |
| 1427 | |
| 1428 | if (role & BDRV_CHILD_METADATA) { |
| 1429 | flags &= ~BDRV_O_NO_IO; |
| 1430 | } |
| 1431 | if (role & BDRV_CHILD_COW) { |
| 1432 | flags &= ~BDRV_O_TEMPORARY; |
| 1433 | } |
| 1434 | |
| 1435 | *child_flags = flags; |
| 1436 | } |
| 1437 | |
Kevin Wolf | 303de47 | 2022-12-07 14:18:35 +0100 | [diff] [blame] | 1438 | static void GRAPH_WRLOCK bdrv_child_cb_attach(BdrvChild *child) |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1439 | { |
| 1440 | BlockDriverState *bs = child->opaque; |
| 1441 | |
Emanuele Giuseppe Esposito | 3f35f82 | 2022-12-07 14:18:33 +0100 | [diff] [blame] | 1442 | assert_bdrv_graph_writable(); |
Hanna Reitz | a225369 | 2021-11-15 15:53:58 +0100 | [diff] [blame] | 1443 | QLIST_INSERT_HEAD(&bs->children, child, next); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1444 | if (bs->drv->is_filter || (child->role & BDRV_CHILD_FILTERED)) { |
| 1445 | /* |
| 1446 | * Here we handle filters and block/raw-format.c when it behave like |
| 1447 | * filter. They generally have a single PRIMARY child, which is also the |
| 1448 | * FILTERED child, and that they may have multiple more children, which |
| 1449 | * are neither PRIMARY nor FILTERED. And never we have a COW child here. |
| 1450 | * So bs->file will be the PRIMARY child, unless the PRIMARY child goes |
| 1451 | * into bs->backing on exceptional cases; and bs->backing will be |
| 1452 | * nothing else. |
| 1453 | */ |
| 1454 | assert(!(child->role & BDRV_CHILD_COW)); |
| 1455 | if (child->role & BDRV_CHILD_PRIMARY) { |
| 1456 | assert(child->role & BDRV_CHILD_FILTERED); |
| 1457 | assert(!bs->backing); |
| 1458 | assert(!bs->file); |
Hanna Reitz | a225369 | 2021-11-15 15:53:58 +0100 | [diff] [blame] | 1459 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1460 | if (bs->drv->filtered_child_is_backing) { |
| 1461 | bs->backing = child; |
| 1462 | } else { |
| 1463 | bs->file = child; |
| 1464 | } |
| 1465 | } else { |
| 1466 | assert(!(child->role & BDRV_CHILD_FILTERED)); |
| 1467 | } |
| 1468 | } else if (child->role & BDRV_CHILD_COW) { |
| 1469 | assert(bs->drv->supports_backing); |
| 1470 | assert(!(child->role & BDRV_CHILD_PRIMARY)); |
| 1471 | assert(!bs->backing); |
| 1472 | bs->backing = child; |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1473 | bdrv_backing_attach(child); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1474 | } else if (child->role & BDRV_CHILD_PRIMARY) { |
| 1475 | assert(!bs->file); |
| 1476 | bs->file = child; |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1477 | } |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1478 | } |
| 1479 | |
Kevin Wolf | 303de47 | 2022-12-07 14:18:35 +0100 | [diff] [blame] | 1480 | static void GRAPH_WRLOCK bdrv_child_cb_detach(BdrvChild *child) |
Max Reitz | 48e0828 | 2020-05-13 13:05:23 +0200 | [diff] [blame] | 1481 | { |
| 1482 | BlockDriverState *bs = child->opaque; |
| 1483 | |
| 1484 | if (child->role & BDRV_CHILD_COW) { |
| 1485 | bdrv_backing_detach(child); |
| 1486 | } |
| 1487 | |
Emanuele Giuseppe Esposito | 3f35f82 | 2022-12-07 14:18:33 +0100 | [diff] [blame] | 1488 | assert_bdrv_graph_writable(); |
Hanna Reitz | a225369 | 2021-11-15 15:53:58 +0100 | [diff] [blame] | 1489 | QLIST_REMOVE(child, next); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1490 | if (child == bs->backing) { |
| 1491 | assert(child != bs->file); |
| 1492 | bs->backing = NULL; |
| 1493 | } else if (child == bs->file) { |
| 1494 | bs->file = NULL; |
| 1495 | } |
Max Reitz | 48e0828 | 2020-05-13 13:05:23 +0200 | [diff] [blame] | 1496 | } |
| 1497 | |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1498 | static int bdrv_child_cb_update_filename(BdrvChild *c, BlockDriverState *base, |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame^] | 1499 | const char *filename, |
| 1500 | bool backing_mask_protocol, |
| 1501 | Error **errp) |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1502 | { |
| 1503 | if (c->role & BDRV_CHILD_COW) { |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame^] | 1504 | return bdrv_backing_update_filename(c, base, filename, |
| 1505 | backing_mask_protocol, |
| 1506 | errp); |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1507 | } |
| 1508 | return 0; |
| 1509 | } |
| 1510 | |
Vladimir Sementsov-Ogievskiy | fb62b58 | 2021-05-24 13:12:56 +0300 | [diff] [blame] | 1511 | AioContext *child_of_bds_get_parent_aio_context(BdrvChild *c) |
Vladimir Sementsov-Ogievskiy | 3ca1f32 | 2021-04-28 18:17:33 +0300 | [diff] [blame] | 1512 | { |
| 1513 | BlockDriverState *bs = c->opaque; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 1514 | IO_CODE(); |
Vladimir Sementsov-Ogievskiy | 3ca1f32 | 2021-04-28 18:17:33 +0300 | [diff] [blame] | 1515 | |
| 1516 | return bdrv_get_aio_context(bs); |
| 1517 | } |
| 1518 | |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1519 | const BdrvChildClass child_of_bds = { |
| 1520 | .parent_is_bds = true, |
| 1521 | .get_parent_desc = bdrv_child_get_parent_desc, |
| 1522 | .inherit_options = bdrv_inherited_options, |
| 1523 | .drained_begin = bdrv_child_cb_drained_begin, |
| 1524 | .drained_poll = bdrv_child_cb_drained_poll, |
| 1525 | .drained_end = bdrv_child_cb_drained_end, |
| 1526 | .attach = bdrv_child_cb_attach, |
| 1527 | .detach = bdrv_child_cb_detach, |
| 1528 | .inactivate = bdrv_child_cb_inactivate, |
Emanuele Giuseppe Esposito | 27633e7 | 2022-10-25 04:49:47 -0400 | [diff] [blame] | 1529 | .change_aio_ctx = bdrv_child_cb_change_aio_ctx, |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1530 | .update_filename = bdrv_child_cb_update_filename, |
Vladimir Sementsov-Ogievskiy | fb62b58 | 2021-05-24 13:12:56 +0300 | [diff] [blame] | 1531 | .get_parent_aio_context = child_of_bds_get_parent_aio_context, |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1532 | }; |
| 1533 | |
Vladimir Sementsov-Ogievskiy | 3ca1f32 | 2021-04-28 18:17:33 +0300 | [diff] [blame] | 1534 | AioContext *bdrv_child_get_parent_aio_context(BdrvChild *c) |
| 1535 | { |
Hanna Reitz | d5f8d79 | 2022-11-07 16:13:19 +0100 | [diff] [blame] | 1536 | IO_CODE(); |
Vladimir Sementsov-Ogievskiy | 3ca1f32 | 2021-04-28 18:17:33 +0300 | [diff] [blame] | 1537 | return c->klass->get_parent_aio_context(c); |
| 1538 | } |
| 1539 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1540 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
| 1541 | { |
Kevin Wolf | 61de4c6 | 2016-03-18 17:46:45 +0100 | [diff] [blame] | 1542 | int open_flags = flags; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1543 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1544 | |
| 1545 | /* |
| 1546 | * Clear flags that are internal to the block layer before opening the |
| 1547 | * image. |
| 1548 | */ |
Kevin Wolf | 20cca27 | 2014-06-04 14:33:27 +0200 | [diff] [blame] | 1549 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1550 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1551 | return open_flags; |
| 1552 | } |
| 1553 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1554 | static void update_flags_from_options(int *flags, QemuOpts *opts) |
| 1555 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1556 | GLOBAL_STATE_CODE(); |
| 1557 | |
Alberto Garcia | 2a3d433 | 2018-11-12 16:00:48 +0200 | [diff] [blame] | 1558 | *flags &= ~(BDRV_O_CACHE_MASK | BDRV_O_RDWR | BDRV_O_AUTO_RDONLY); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1559 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 1560 | 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] | 1561 | *flags |= BDRV_O_NO_FLUSH; |
| 1562 | } |
| 1563 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 1564 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_CACHE_DIRECT, false)) { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1565 | *flags |= BDRV_O_NOCACHE; |
| 1566 | } |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1567 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 1568 | if (!qemu_opt_get_bool_del(opts, BDRV_OPT_READ_ONLY, false)) { |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1569 | *flags |= BDRV_O_RDWR; |
| 1570 | } |
| 1571 | |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1572 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_AUTO_READ_ONLY, false)) { |
| 1573 | *flags |= BDRV_O_AUTO_RDONLY; |
| 1574 | } |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1575 | } |
| 1576 | |
| 1577 | static void update_options_from_flags(QDict *options, int flags) |
| 1578 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1579 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1580 | if (!qdict_haskey(options, BDRV_OPT_CACHE_DIRECT)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1581 | qdict_put_bool(options, BDRV_OPT_CACHE_DIRECT, flags & BDRV_O_NOCACHE); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1582 | } |
| 1583 | if (!qdict_haskey(options, BDRV_OPT_CACHE_NO_FLUSH)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1584 | qdict_put_bool(options, BDRV_OPT_CACHE_NO_FLUSH, |
| 1585 | flags & BDRV_O_NO_FLUSH); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1586 | } |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1587 | if (!qdict_haskey(options, BDRV_OPT_READ_ONLY)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1588 | qdict_put_bool(options, BDRV_OPT_READ_ONLY, !(flags & BDRV_O_RDWR)); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1589 | } |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1590 | if (!qdict_haskey(options, BDRV_OPT_AUTO_READ_ONLY)) { |
| 1591 | qdict_put_bool(options, BDRV_OPT_AUTO_READ_ONLY, |
| 1592 | flags & BDRV_O_AUTO_RDONLY); |
| 1593 | } |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1594 | } |
| 1595 | |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 1596 | static void bdrv_assign_node_name(BlockDriverState *bs, |
| 1597 | const char *node_name, |
| 1598 | Error **errp) |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1599 | { |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1600 | char *gen_node_name = NULL; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1601 | GLOBAL_STATE_CODE(); |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1602 | |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1603 | if (!node_name) { |
| 1604 | node_name = gen_node_name = id_generate(ID_BLOCK); |
| 1605 | } else if (!id_wellformed(node_name)) { |
| 1606 | /* |
| 1607 | * Check for empty string or invalid characters, but not if it is |
| 1608 | * generated (generated names use characters not available to the user) |
| 1609 | */ |
Connor Kuehl | 785ec4b | 2021-03-05 09:19:28 -0600 | [diff] [blame] | 1610 | error_setg(errp, "Invalid node-name: '%s'", node_name); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 1611 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1612 | } |
| 1613 | |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1614 | /* takes care of avoiding namespaces collisions */ |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 1615 | if (blk_by_name(node_name)) { |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1616 | error_setg(errp, "node-name=%s is conflicting with a device id", |
| 1617 | node_name); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1618 | goto out; |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1619 | } |
| 1620 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1621 | /* takes care of avoiding duplicates node names */ |
| 1622 | if (bdrv_find_node(node_name)) { |
Connor Kuehl | 785ec4b | 2021-03-05 09:19:28 -0600 | [diff] [blame] | 1623 | error_setg(errp, "Duplicate nodes with node-name='%s'", node_name); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1624 | goto out; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1625 | } |
| 1626 | |
Kevin Wolf | 824808d | 2018-07-04 13:28:29 +0200 | [diff] [blame] | 1627 | /* Make sure that the node name isn't truncated */ |
| 1628 | if (strlen(node_name) >= sizeof(bs->node_name)) { |
| 1629 | error_setg(errp, "Node name too long"); |
| 1630 | goto out; |
| 1631 | } |
| 1632 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1633 | /* copy node name into the bs and insert it into the graph list */ |
| 1634 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); |
| 1635 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1636 | out: |
| 1637 | g_free(gen_node_name); |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1638 | } |
| 1639 | |
Kevin Wolf | 1a30b0f | 2023-05-04 13:57:38 +0200 | [diff] [blame] | 1640 | static int no_coroutine_fn GRAPH_UNLOCKED |
| 1641 | bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, const char *node_name, |
| 1642 | QDict *options, int open_flags, Error **errp) |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1643 | { |
| 1644 | Error *local_err = NULL; |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 1645 | int i, ret; |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 1646 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1647 | |
| 1648 | bdrv_assign_node_name(bs, node_name, &local_err); |
| 1649 | if (local_err) { |
| 1650 | error_propagate(errp, local_err); |
| 1651 | return -EINVAL; |
| 1652 | } |
| 1653 | |
| 1654 | bs->drv = drv; |
| 1655 | bs->opaque = g_malloc0(drv->instance_size); |
| 1656 | |
| 1657 | if (drv->bdrv_file_open) { |
| 1658 | assert(!drv->bdrv_needs_filename || bs->filename[0]); |
| 1659 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1660 | } else if (drv->bdrv_open) { |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1661 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1662 | } else { |
| 1663 | ret = 0; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1664 | } |
| 1665 | |
| 1666 | if (ret < 0) { |
| 1667 | if (local_err) { |
| 1668 | error_propagate(errp, local_err); |
| 1669 | } else if (bs->filename[0]) { |
| 1670 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); |
| 1671 | } else { |
| 1672 | error_setg_errno(errp, -ret, "Could not open image"); |
| 1673 | } |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1674 | goto open_failed; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1675 | } |
| 1676 | |
Stefan Hajnoczi | e8b6535 | 2022-10-13 14:59:01 -0400 | [diff] [blame] | 1677 | assert(!(bs->supported_read_flags & ~BDRV_REQ_MASK)); |
| 1678 | assert(!(bs->supported_write_flags & ~BDRV_REQ_MASK)); |
| 1679 | |
| 1680 | /* |
| 1681 | * Always allow the BDRV_REQ_REGISTERED_BUF optimization hint. This saves |
| 1682 | * drivers that pass read/write requests through to a child the trouble of |
| 1683 | * declaring support explicitly. |
| 1684 | * |
| 1685 | * Drivers must not propagate this flag accidentally when they initiate I/O |
| 1686 | * to a bounce buffer. That case should be rare though. |
| 1687 | */ |
| 1688 | bs->supported_read_flags |= BDRV_REQ_REGISTERED_BUF; |
| 1689 | bs->supported_write_flags |= BDRV_REQ_REGISTERED_BUF; |
| 1690 | |
Emanuele Giuseppe Esposito | c057960 | 2023-01-13 21:42:03 +0100 | [diff] [blame] | 1691 | ret = bdrv_refresh_total_sectors(bs, bs->total_sectors); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1692 | if (ret < 0) { |
| 1693 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1694 | return ret; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1695 | } |
| 1696 | |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 1697 | bdrv_graph_rdlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 1e4c797 | 2021-04-28 18:17:55 +0300 | [diff] [blame] | 1698 | bdrv_refresh_limits(bs, NULL, &local_err); |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 1699 | bdrv_graph_rdunlock_main_loop(); |
| 1700 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1701 | if (local_err) { |
| 1702 | error_propagate(errp, local_err); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1703 | return -EINVAL; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1704 | } |
| 1705 | |
| 1706 | assert(bdrv_opt_mem_align(bs) != 0); |
| 1707 | assert(bdrv_min_mem_align(bs) != 0); |
| 1708 | assert(is_power_of_2(bs->bl.request_alignment)); |
| 1709 | |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 1710 | for (i = 0; i < bs->quiesce_counter; i++) { |
Kevin Wolf | 5e8ac21 | 2022-11-18 18:40:58 +0100 | [diff] [blame] | 1711 | if (drv->bdrv_drain_begin) { |
| 1712 | drv->bdrv_drain_begin(bs); |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 1713 | } |
| 1714 | } |
| 1715 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1716 | return 0; |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1717 | open_failed: |
| 1718 | bs->drv = NULL; |
Kevin Wolf | 1f051dc | 2023-10-27 17:53:33 +0200 | [diff] [blame] | 1719 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 1720 | bdrv_graph_wrlock(); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1721 | if (bs->file != NULL) { |
| 1722 | bdrv_unref_child(bs, bs->file); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1723 | assert(!bs->file); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1724 | } |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 1725 | bdrv_graph_wrunlock(); |
Kevin Wolf | 1f051dc | 2023-10-27 17:53:33 +0200 | [diff] [blame] | 1726 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1727 | g_free(bs->opaque); |
| 1728 | bs->opaque = NULL; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1729 | return ret; |
| 1730 | } |
| 1731 | |
Vladimir Sementsov-Ogievskiy | 621d173 | 2021-09-20 14:55:34 +0300 | [diff] [blame] | 1732 | /* |
| 1733 | * Create and open a block node. |
| 1734 | * |
| 1735 | * @options is a QDict of options to pass to the block drivers, or NULL for an |
| 1736 | * empty set of options. The reference to the QDict belongs to the block layer |
| 1737 | * after the call (even on failure), so if the caller intends to reuse the |
| 1738 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. |
| 1739 | */ |
| 1740 | BlockDriverState *bdrv_new_open_driver_opts(BlockDriver *drv, |
| 1741 | const char *node_name, |
| 1742 | QDict *options, int flags, |
| 1743 | Error **errp) |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1744 | { |
| 1745 | BlockDriverState *bs; |
| 1746 | int ret; |
| 1747 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 1748 | GLOBAL_STATE_CODE(); |
| 1749 | |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1750 | bs = bdrv_new(); |
| 1751 | bs->open_flags = flags; |
Vladimir Sementsov-Ogievskiy | 621d173 | 2021-09-20 14:55:34 +0300 | [diff] [blame] | 1752 | bs->options = options ?: qdict_new(); |
| 1753 | bs->explicit_options = qdict_clone_shallow(bs->options); |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1754 | bs->opaque = NULL; |
| 1755 | |
| 1756 | update_options_from_flags(bs->options, flags); |
| 1757 | |
| 1758 | ret = bdrv_open_driver(bs, drv, node_name, bs->options, flags, errp); |
| 1759 | if (ret < 0) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1760 | qobject_unref(bs->explicit_options); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1761 | bs->explicit_options = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1762 | qobject_unref(bs->options); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1763 | bs->options = NULL; |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1764 | bdrv_unref(bs); |
| 1765 | return NULL; |
| 1766 | } |
| 1767 | |
| 1768 | return bs; |
| 1769 | } |
| 1770 | |
Vladimir Sementsov-Ogievskiy | 621d173 | 2021-09-20 14:55:34 +0300 | [diff] [blame] | 1771 | /* Create and open a block node. */ |
| 1772 | BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, |
| 1773 | int flags, Error **errp) |
| 1774 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 1775 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 621d173 | 2021-09-20 14:55:34 +0300 | [diff] [blame] | 1776 | return bdrv_new_open_driver_opts(drv, node_name, NULL, flags, errp); |
| 1777 | } |
| 1778 | |
Kevin Wolf | c5f3014 | 2016-10-06 11:33:17 +0200 | [diff] [blame] | 1779 | QemuOptsList bdrv_runtime_opts = { |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1780 | .name = "bdrv_common", |
| 1781 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_runtime_opts.head), |
| 1782 | .desc = { |
| 1783 | { |
| 1784 | .name = "node-name", |
| 1785 | .type = QEMU_OPT_STRING, |
| 1786 | .help = "Node name of the block device node", |
| 1787 | }, |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1788 | { |
| 1789 | .name = "driver", |
| 1790 | .type = QEMU_OPT_STRING, |
| 1791 | .help = "Block driver to use for the node", |
| 1792 | }, |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1793 | { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1794 | .name = BDRV_OPT_CACHE_DIRECT, |
| 1795 | .type = QEMU_OPT_BOOL, |
| 1796 | .help = "Bypass software writeback cache on the host", |
| 1797 | }, |
| 1798 | { |
| 1799 | .name = BDRV_OPT_CACHE_NO_FLUSH, |
| 1800 | .type = QEMU_OPT_BOOL, |
| 1801 | .help = "Ignore flush requests", |
| 1802 | }, |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1803 | { |
| 1804 | .name = BDRV_OPT_READ_ONLY, |
| 1805 | .type = QEMU_OPT_BOOL, |
| 1806 | .help = "Node is opened in read-only mode", |
| 1807 | }, |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1808 | { |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1809 | .name = BDRV_OPT_AUTO_READ_ONLY, |
| 1810 | .type = QEMU_OPT_BOOL, |
| 1811 | .help = "Node can become read-only if opening read-write fails", |
| 1812 | }, |
| 1813 | { |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1814 | .name = "detect-zeroes", |
| 1815 | .type = QEMU_OPT_STRING, |
| 1816 | .help = "try to optimize zero writes (off, on, unmap)", |
| 1817 | }, |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1818 | { |
Alberto Garcia | 415bbca | 2018-10-03 13:23:13 +0300 | [diff] [blame] | 1819 | .name = BDRV_OPT_DISCARD, |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1820 | .type = QEMU_OPT_STRING, |
| 1821 | .help = "discard operation (ignore/off, unmap/on)", |
| 1822 | }, |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 1823 | { |
| 1824 | .name = BDRV_OPT_FORCE_SHARE, |
| 1825 | .type = QEMU_OPT_BOOL, |
| 1826 | .help = "always accept other writers (default: off)", |
| 1827 | }, |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1828 | { /* end of list */ } |
| 1829 | }, |
| 1830 | }; |
| 1831 | |
Maxim Levitsky | 5a5e7f8 | 2020-03-26 03:12:18 +0200 | [diff] [blame] | 1832 | QemuOptsList bdrv_create_opts_simple = { |
| 1833 | .name = "simple-create-opts", |
| 1834 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_create_opts_simple.head), |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 1835 | .desc = { |
| 1836 | { |
| 1837 | .name = BLOCK_OPT_SIZE, |
| 1838 | .type = QEMU_OPT_SIZE, |
| 1839 | .help = "Virtual disk size" |
| 1840 | }, |
| 1841 | { |
| 1842 | .name = BLOCK_OPT_PREALLOC, |
| 1843 | .type = QEMU_OPT_STRING, |
| 1844 | .help = "Preallocation mode (allowed values: off)" |
| 1845 | }, |
| 1846 | { /* end of list */ } |
| 1847 | } |
| 1848 | }; |
| 1849 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1850 | /* |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1851 | * Common part for opening disk images and files |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1852 | * |
| 1853 | * Removes all processed options from *options. |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1854 | */ |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1855 | static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file, |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1856 | QDict *options, Error **errp) |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1857 | { |
| 1858 | int ret, open_flags; |
Kevin Wolf | 035fccd | 2013-04-09 14:34:19 +0200 | [diff] [blame] | 1859 | const char *filename; |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1860 | const char *driver_name = NULL; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1861 | const char *node_name = NULL; |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1862 | const char *discard; |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1863 | QemuOpts *opts; |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1864 | BlockDriver *drv; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1865 | Error *local_err = NULL; |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1866 | bool ro; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1867 | |
Kevin Wolf | 1f051dc | 2023-10-27 17:53:33 +0200 | [diff] [blame] | 1868 | GLOBAL_STATE_CODE(); |
| 1869 | |
| 1870 | bdrv_graph_rdlock_main_loop(); |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 1871 | assert(bs->file == NULL); |
Kevin Wolf | 707ff82 | 2013-03-06 12:20:31 +0100 | [diff] [blame] | 1872 | assert(options != NULL && bs->options != options); |
Kevin Wolf | 1f051dc | 2023-10-27 17:53:33 +0200 | [diff] [blame] | 1873 | bdrv_graph_rdunlock_main_loop(); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1874 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1875 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
Markus Armbruster | af175e8 | 2020-07-07 18:06:03 +0200 | [diff] [blame] | 1876 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1877 | ret = -EINVAL; |
| 1878 | goto fail_opts; |
| 1879 | } |
| 1880 | |
Alberto Garcia | 9b7e869 | 2016-09-15 17:53:01 +0300 | [diff] [blame] | 1881 | update_flags_from_options(&bs->open_flags, opts); |
| 1882 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1883 | driver_name = qemu_opt_get(opts, "driver"); |
| 1884 | drv = bdrv_find_format(driver_name); |
| 1885 | assert(drv != NULL); |
| 1886 | |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 1887 | bs->force_share = qemu_opt_get_bool(opts, BDRV_OPT_FORCE_SHARE, false); |
| 1888 | |
| 1889 | if (bs->force_share && (bs->open_flags & BDRV_O_RDWR)) { |
| 1890 | error_setg(errp, |
| 1891 | BDRV_OPT_FORCE_SHARE |
| 1892 | "=on can only be used with read-only images"); |
| 1893 | ret = -EINVAL; |
| 1894 | goto fail_opts; |
| 1895 | } |
| 1896 | |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1897 | if (file != NULL) { |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 1898 | bdrv_graph_rdlock_main_loop(); |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 1899 | bdrv_refresh_filename(blk_bs(file)); |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 1900 | bdrv_graph_rdunlock_main_loop(); |
| 1901 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1902 | filename = blk_bs(file)->filename; |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1903 | } else { |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 1904 | /* |
| 1905 | * Caution: while qdict_get_try_str() is fine, getting |
| 1906 | * non-string types would require more care. When @options |
| 1907 | * come from -blockdev or blockdev_add, its members are typed |
| 1908 | * according to the QAPI schema, but when they come from |
| 1909 | * -drive, they're all QString. |
| 1910 | */ |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1911 | filename = qdict_get_try_str(options, "filename"); |
| 1912 | } |
| 1913 | |
Max Reitz | 4a00824 | 2017-04-13 18:06:24 +0200 | [diff] [blame] | 1914 | if (drv->bdrv_needs_filename && (!filename || !filename[0])) { |
Kevin Wolf | 765003d | 2014-02-03 14:49:42 +0100 | [diff] [blame] | 1915 | error_setg(errp, "The '%s' block driver requires a file name", |
| 1916 | drv->format_name); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1917 | ret = -EINVAL; |
| 1918 | goto fail_opts; |
| 1919 | } |
| 1920 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1921 | trace_bdrv_open_common(bs, filename ?: "", bs->open_flags, |
| 1922 | drv->format_name); |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1923 | |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1924 | ro = bdrv_is_read_only(bs); |
| 1925 | |
| 1926 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, ro)) { |
| 1927 | if (!ro && bdrv_is_whitelisted(drv, true)) { |
Kevin Wolf | 018f9de | 2023-09-29 16:51:53 +0200 | [diff] [blame] | 1928 | bdrv_graph_rdlock_main_loop(); |
Kevin Wolf | 8be25de | 2019-01-22 13:15:31 +0100 | [diff] [blame] | 1929 | ret = bdrv_apply_auto_read_only(bs, NULL, NULL); |
Kevin Wolf | 018f9de | 2023-09-29 16:51:53 +0200 | [diff] [blame] | 1930 | bdrv_graph_rdunlock_main_loop(); |
Kevin Wolf | 8be25de | 2019-01-22 13:15:31 +0100 | [diff] [blame] | 1931 | } else { |
| 1932 | ret = -ENOTSUP; |
| 1933 | } |
| 1934 | if (ret < 0) { |
| 1935 | error_setg(errp, |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1936 | !ro && bdrv_is_whitelisted(drv, true) |
Kevin Wolf | 8be25de | 2019-01-22 13:15:31 +0100 | [diff] [blame] | 1937 | ? "Driver '%s' can only be used for read-only devices" |
| 1938 | : "Driver '%s' is not whitelisted", |
| 1939 | drv->format_name); |
| 1940 | goto fail_opts; |
| 1941 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 1942 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1943 | |
Paolo Bonzini | d3faa13 | 2017-06-05 14:38:50 +0200 | [diff] [blame] | 1944 | /* bdrv_new() and bdrv_close() make it so */ |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 1945 | assert(qatomic_read(&bs->copy_on_read) == 0); |
Paolo Bonzini | d3faa13 | 2017-06-05 14:38:50 +0200 | [diff] [blame] | 1946 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1947 | if (bs->open_flags & BDRV_O_COPY_ON_READ) { |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1948 | if (!ro) { |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 1949 | bdrv_enable_copy_on_read(bs); |
| 1950 | } else { |
| 1951 | 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] | 1952 | ret = -EINVAL; |
| 1953 | goto fail_opts; |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 1954 | } |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 1955 | } |
| 1956 | |
Alberto Garcia | 415bbca | 2018-10-03 13:23:13 +0300 | [diff] [blame] | 1957 | discard = qemu_opt_get(opts, BDRV_OPT_DISCARD); |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1958 | if (discard != NULL) { |
| 1959 | if (bdrv_parse_discard_flags(discard, &bs->open_flags) != 0) { |
| 1960 | error_setg(errp, "Invalid discard option"); |
| 1961 | ret = -EINVAL; |
| 1962 | goto fail_opts; |
| 1963 | } |
| 1964 | } |
| 1965 | |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 1966 | bs->detect_zeroes = |
| 1967 | bdrv_parse_detect_zeroes(opts, bs->open_flags, &local_err); |
| 1968 | if (local_err) { |
| 1969 | error_propagate(errp, local_err); |
| 1970 | ret = -EINVAL; |
| 1971 | goto fail_opts; |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1972 | } |
| 1973 | |
Kevin Wolf | c2ad1b0 | 2013-03-18 16:40:51 +0100 | [diff] [blame] | 1974 | if (filename != NULL) { |
| 1975 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
| 1976 | } else { |
| 1977 | bs->filename[0] = '\0'; |
| 1978 | } |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 1979 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1980 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1981 | /* Open the image, either directly or using a protocol */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1982 | open_flags = bdrv_open_flags(bs, bs->open_flags); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1983 | node_name = qemu_opt_get(opts, "node-name"); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1984 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1985 | assert(!drv->bdrv_file_open || file == NULL); |
| 1986 | ret = bdrv_open_driver(bs, drv, node_name, options, open_flags, errp); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1987 | if (ret < 0) { |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1988 | goto fail_opts; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1989 | } |
| 1990 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1991 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1992 | return 0; |
| 1993 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1994 | fail_opts: |
| 1995 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1996 | return ret; |
| 1997 | } |
| 1998 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1999 | static QDict *parse_json_filename(const char *filename, Error **errp) |
| 2000 | { |
| 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, |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2059 | int *flags, Error **errp) |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2060 | { |
| 2061 | const char *drvname; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2062 | bool protocol = *flags & BDRV_O_PROTOCOL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2063 | bool parse_filename = false; |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2064 | BlockDriver *drv = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2065 | Error *local_err = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2066 | |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2067 | GLOBAL_STATE_CODE(); |
| 2068 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2069 | /* |
| 2070 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 2071 | * types would require more care. When @options come from |
| 2072 | * -blockdev or blockdev_add, its members are typed according to |
| 2073 | * the QAPI schema, but when they come from -drive, they're all |
| 2074 | * QString. |
| 2075 | */ |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2076 | drvname = qdict_get_try_str(*options, "driver"); |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2077 | if (drvname) { |
| 2078 | drv = bdrv_find_format(drvname); |
| 2079 | if (!drv) { |
| 2080 | error_setg(errp, "Unknown driver '%s'", drvname); |
| 2081 | return -ENOENT; |
| 2082 | } |
| 2083 | /* If the user has explicitly specified the driver, this choice should |
| 2084 | * override the BDRV_O_PROTOCOL flag */ |
| 2085 | protocol = drv->bdrv_file_open; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2086 | } |
| 2087 | |
| 2088 | if (protocol) { |
| 2089 | *flags |= BDRV_O_PROTOCOL; |
| 2090 | } else { |
| 2091 | *flags &= ~BDRV_O_PROTOCOL; |
| 2092 | } |
| 2093 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 2094 | /* Translate cache options from flags into options */ |
| 2095 | update_options_from_flags(*options, *flags); |
| 2096 | |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2097 | /* Fetch the file name from the options QDict if necessary */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2098 | if (protocol && filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2099 | if (!qdict_haskey(*options, "filename")) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2100 | qdict_put_str(*options, "filename", filename); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2101 | parse_filename = true; |
| 2102 | } else { |
| 2103 | error_setg(errp, "Can't specify 'file' and 'filename' options at " |
| 2104 | "the same time"); |
| 2105 | return -EINVAL; |
| 2106 | } |
| 2107 | } |
| 2108 | |
| 2109 | /* Find the right block driver */ |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2110 | /* See cautionary note on accessing @options above */ |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2111 | filename = qdict_get_try_str(*options, "filename"); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2112 | |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2113 | if (!drvname && protocol) { |
| 2114 | if (filename) { |
| 2115 | drv = bdrv_find_protocol(filename, parse_filename, errp); |
| 2116 | if (!drv) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2117 | return -EINVAL; |
| 2118 | } |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2119 | |
| 2120 | drvname = drv->format_name; |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2121 | qdict_put_str(*options, "driver", drvname); |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2122 | } else { |
| 2123 | error_setg(errp, "Must specify either driver or file"); |
| 2124 | return -EINVAL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2125 | } |
| 2126 | } |
| 2127 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2128 | assert(drv || !protocol); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2129 | |
| 2130 | /* Driver-specific filename parsing */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2131 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2132 | drv->bdrv_parse_filename(filename, *options, &local_err); |
| 2133 | if (local_err) { |
| 2134 | error_propagate(errp, local_err); |
| 2135 | return -EINVAL; |
| 2136 | } |
| 2137 | |
| 2138 | if (!drv->bdrv_needs_filename) { |
| 2139 | qdict_del(*options, "filename"); |
| 2140 | } |
| 2141 | } |
| 2142 | |
| 2143 | return 0; |
| 2144 | } |
| 2145 | |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2146 | typedef struct BlockReopenQueueEntry { |
| 2147 | bool prepared; |
| 2148 | BDRVReopenState state; |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 2149 | QTAILQ_ENTRY(BlockReopenQueueEntry) entry; |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2150 | } BlockReopenQueueEntry; |
| 2151 | |
| 2152 | /* |
| 2153 | * Return the flags that @bs will have after the reopens in @q have |
| 2154 | * successfully completed. If @q is NULL (or @bs is not contained in @q), |
| 2155 | * return the current flags. |
| 2156 | */ |
| 2157 | static int bdrv_reopen_get_flags(BlockReopenQueue *q, BlockDriverState *bs) |
| 2158 | { |
| 2159 | BlockReopenQueueEntry *entry; |
| 2160 | |
| 2161 | if (q != NULL) { |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 2162 | QTAILQ_FOREACH(entry, q, entry) { |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2163 | if (entry->state.bs == bs) { |
| 2164 | return entry->state.flags; |
| 2165 | } |
| 2166 | } |
| 2167 | } |
| 2168 | |
| 2169 | return bs->open_flags; |
| 2170 | } |
| 2171 | |
| 2172 | /* Returns whether the image file can be written to after the reopen queue @q |
| 2173 | * has been successfully applied, or right now if @q is NULL. */ |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2174 | static bool bdrv_is_writable_after_reopen(BlockDriverState *bs, |
| 2175 | BlockReopenQueue *q) |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2176 | { |
| 2177 | int flags = bdrv_reopen_get_flags(q, bs); |
| 2178 | |
| 2179 | return (flags & (BDRV_O_RDWR | BDRV_O_INACTIVE)) == BDRV_O_RDWR; |
| 2180 | } |
| 2181 | |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2182 | /* |
| 2183 | * Return whether the BDS can be written to. This is not necessarily |
| 2184 | * the same as !bdrv_is_read_only(bs), as inactivated images may not |
| 2185 | * be written to but do not count as read-only images. |
| 2186 | */ |
| 2187 | bool bdrv_is_writable(BlockDriverState *bs) |
| 2188 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 2189 | IO_CODE(); |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2190 | return bdrv_is_writable_after_reopen(bs, NULL); |
| 2191 | } |
| 2192 | |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2193 | static char *bdrv_child_user_desc(BdrvChild *c) |
| 2194 | { |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 2195 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | da261b6 | 2021-06-01 10:52:17 +0300 | [diff] [blame] | 2196 | return c->klass->get_parent_desc(c); |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2197 | } |
| 2198 | |
Vladimir Sementsov-Ogievskiy | 30ebb9a | 2021-06-01 10:52:18 +0300 | [diff] [blame] | 2199 | /* |
| 2200 | * Check that @a allows everything that @b needs. @a and @b must reference same |
| 2201 | * child node. |
| 2202 | */ |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2203 | static bool bdrv_a_allow_b(BdrvChild *a, BdrvChild *b, Error **errp) |
| 2204 | { |
Vladimir Sementsov-Ogievskiy | 30ebb9a | 2021-06-01 10:52:18 +0300 | [diff] [blame] | 2205 | const char *child_bs_name; |
| 2206 | g_autofree char *a_user = NULL; |
| 2207 | g_autofree char *b_user = NULL; |
| 2208 | g_autofree char *perms = NULL; |
| 2209 | |
| 2210 | assert(a->bs); |
| 2211 | assert(a->bs == b->bs); |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2212 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2213 | |
| 2214 | if ((b->perm & a->shared_perm) == b->perm) { |
| 2215 | return true; |
| 2216 | } |
| 2217 | |
Vladimir Sementsov-Ogievskiy | 30ebb9a | 2021-06-01 10:52:18 +0300 | [diff] [blame] | 2218 | child_bs_name = bdrv_get_node_name(b->bs); |
| 2219 | a_user = bdrv_child_user_desc(a); |
| 2220 | b_user = bdrv_child_user_desc(b); |
| 2221 | perms = bdrv_perm_names(b->perm & ~a->shared_perm); |
| 2222 | |
| 2223 | error_setg(errp, "Permission conflict on node '%s': permissions '%s' are " |
| 2224 | "both required by %s (uses node '%s' as '%s' child) and " |
| 2225 | "unshared by %s (uses node '%s' as '%s' child).", |
| 2226 | child_bs_name, perms, |
| 2227 | b_user, child_bs_name, b->name, |
| 2228 | a_user, child_bs_name, a->name); |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2229 | |
| 2230 | return false; |
| 2231 | } |
| 2232 | |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 2233 | static bool GRAPH_RDLOCK |
| 2234 | bdrv_parent_perms_conflict(BlockDriverState *bs, Error **errp) |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2235 | { |
| 2236 | BdrvChild *a, *b; |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2237 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2238 | |
| 2239 | /* |
| 2240 | * During the loop we'll look at each pair twice. That's correct because |
| 2241 | * bdrv_a_allow_b() is asymmetric and we should check each pair in both |
| 2242 | * directions. |
| 2243 | */ |
| 2244 | QLIST_FOREACH(a, &bs->parents, next_parent) { |
| 2245 | QLIST_FOREACH(b, &bs->parents, next_parent) { |
Vladimir Sementsov-Ogievskiy | 9397c14 | 2021-04-28 18:17:53 +0300 | [diff] [blame] | 2246 | if (a == b) { |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2247 | continue; |
| 2248 | } |
| 2249 | |
| 2250 | if (!bdrv_a_allow_b(a, b, errp)) { |
| 2251 | return true; |
| 2252 | } |
| 2253 | } |
| 2254 | } |
| 2255 | |
| 2256 | return false; |
| 2257 | } |
| 2258 | |
Kevin Wolf | c629b6d | 2023-09-11 11:46:14 +0200 | [diff] [blame] | 2259 | static void GRAPH_RDLOCK |
| 2260 | bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs, |
| 2261 | BdrvChild *c, BdrvChildRole role, |
| 2262 | BlockReopenQueue *reopen_queue, |
| 2263 | uint64_t parent_perm, uint64_t parent_shared, |
| 2264 | uint64_t *nperm, uint64_t *nshared) |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 2265 | { |
Alberto Garcia | 0b3ca76 | 2019-04-04 14:29:53 +0300 | [diff] [blame] | 2266 | assert(bs->drv && bs->drv->bdrv_child_perm); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2267 | GLOBAL_STATE_CODE(); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2268 | bs->drv->bdrv_child_perm(bs, c, role, reopen_queue, |
Alberto Garcia | 0b3ca76 | 2019-04-04 14:29:53 +0300 | [diff] [blame] | 2269 | parent_perm, parent_shared, |
| 2270 | nperm, nshared); |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 2271 | /* TODO Take force_share from reopen_queue */ |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 2272 | if (child_bs && child_bs->force_share) { |
| 2273 | *nshared = BLK_PERM_ALL; |
| 2274 | } |
| 2275 | } |
| 2276 | |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2277 | /* |
| 2278 | * Adds the whole subtree of @bs (including @bs itself) to the @list (except for |
| 2279 | * nodes that are already in the @list, of course) so that final list is |
| 2280 | * topologically sorted. Return the result (GSList @list object is updated, so |
| 2281 | * don't use old reference after function call). |
| 2282 | * |
| 2283 | * On function start @list must be already topologically sorted and for any node |
| 2284 | * in the @list the whole subtree of the node must be in the @list as well. The |
| 2285 | * simplest way to satisfy this criteria: use only result of |
| 2286 | * bdrv_topological_dfs() or NULL as @list parameter. |
| 2287 | */ |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 2288 | static GSList * GRAPH_RDLOCK |
| 2289 | bdrv_topological_dfs(GSList *list, GHashTable *found, BlockDriverState *bs) |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2290 | { |
| 2291 | BdrvChild *child; |
| 2292 | g_autoptr(GHashTable) local_found = NULL; |
| 2293 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2294 | GLOBAL_STATE_CODE(); |
| 2295 | |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2296 | if (!found) { |
| 2297 | assert(!list); |
| 2298 | found = local_found = g_hash_table_new(NULL, NULL); |
| 2299 | } |
| 2300 | |
| 2301 | if (g_hash_table_contains(found, bs)) { |
| 2302 | return list; |
| 2303 | } |
| 2304 | g_hash_table_add(found, bs); |
| 2305 | |
| 2306 | QLIST_FOREACH(child, &bs->children, next) { |
| 2307 | list = bdrv_topological_dfs(list, found, child->bs); |
| 2308 | } |
| 2309 | |
| 2310 | return g_slist_prepend(list, bs); |
| 2311 | } |
| 2312 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2313 | typedef struct BdrvChildSetPermState { |
| 2314 | BdrvChild *child; |
| 2315 | uint64_t old_perm; |
| 2316 | uint64_t old_shared_perm; |
| 2317 | } BdrvChildSetPermState; |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2318 | |
| 2319 | static void bdrv_child_set_perm_abort(void *opaque) |
| 2320 | { |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2321 | BdrvChildSetPermState *s = opaque; |
| 2322 | |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2323 | GLOBAL_STATE_CODE(); |
| 2324 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2325 | s->child->perm = s->old_perm; |
| 2326 | s->child->shared_perm = s->old_shared_perm; |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2327 | } |
| 2328 | |
| 2329 | static TransactionActionDrv bdrv_child_set_pem_drv = { |
| 2330 | .abort = bdrv_child_set_perm_abort, |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2331 | .clean = g_free, |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2332 | }; |
| 2333 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2334 | static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, |
| 2335 | uint64_t shared, Transaction *tran) |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2336 | { |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2337 | BdrvChildSetPermState *s = g_new(BdrvChildSetPermState, 1); |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2338 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2339 | |
| 2340 | *s = (BdrvChildSetPermState) { |
| 2341 | .child = c, |
| 2342 | .old_perm = c->perm, |
| 2343 | .old_shared_perm = c->shared_perm, |
| 2344 | }; |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2345 | |
| 2346 | c->perm = perm; |
| 2347 | c->shared_perm = shared; |
| 2348 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2349 | tran_add(tran, &bdrv_child_set_pem_drv, s); |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2350 | } |
| 2351 | |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2352 | static void GRAPH_RDLOCK bdrv_drv_set_perm_commit(void *opaque) |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2353 | { |
| 2354 | BlockDriverState *bs = opaque; |
| 2355 | uint64_t cumulative_perms, cumulative_shared_perms; |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2356 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2357 | |
| 2358 | if (bs->drv->bdrv_set_perm) { |
| 2359 | bdrv_get_cumulative_perm(bs, &cumulative_perms, |
| 2360 | &cumulative_shared_perms); |
| 2361 | bs->drv->bdrv_set_perm(bs, cumulative_perms, cumulative_shared_perms); |
| 2362 | } |
| 2363 | } |
| 2364 | |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2365 | static void GRAPH_RDLOCK bdrv_drv_set_perm_abort(void *opaque) |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2366 | { |
| 2367 | BlockDriverState *bs = opaque; |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2368 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2369 | |
| 2370 | if (bs->drv->bdrv_abort_perm_update) { |
| 2371 | bs->drv->bdrv_abort_perm_update(bs); |
| 2372 | } |
| 2373 | } |
| 2374 | |
| 2375 | TransactionActionDrv bdrv_drv_set_perm_drv = { |
| 2376 | .abort = bdrv_drv_set_perm_abort, |
| 2377 | .commit = bdrv_drv_set_perm_commit, |
| 2378 | }; |
| 2379 | |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2380 | /* |
| 2381 | * After calling this function, the transaction @tran may only be completed |
| 2382 | * while holding a reader lock for the graph. |
| 2383 | */ |
| 2384 | static int GRAPH_RDLOCK |
| 2385 | bdrv_drv_set_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared_perm, |
| 2386 | Transaction *tran, Error **errp) |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2387 | { |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2388 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2389 | if (!bs->drv) { |
| 2390 | return 0; |
| 2391 | } |
| 2392 | |
| 2393 | if (bs->drv->bdrv_check_perm) { |
| 2394 | int ret = bs->drv->bdrv_check_perm(bs, perm, shared_perm, errp); |
| 2395 | if (ret < 0) { |
| 2396 | return ret; |
| 2397 | } |
| 2398 | } |
| 2399 | |
| 2400 | if (tran) { |
| 2401 | tran_add(tran, &bdrv_drv_set_perm_drv, bs); |
| 2402 | } |
| 2403 | |
| 2404 | return 0; |
| 2405 | } |
| 2406 | |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2407 | typedef struct BdrvReplaceChildState { |
| 2408 | BdrvChild *child; |
| 2409 | BlockDriverState *old_bs; |
| 2410 | } BdrvReplaceChildState; |
| 2411 | |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 2412 | static void GRAPH_WRLOCK bdrv_replace_child_commit(void *opaque) |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2413 | { |
| 2414 | BdrvReplaceChildState *s = opaque; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2415 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2416 | |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 2417 | bdrv_schedule_unref(s->old_bs); |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2418 | } |
| 2419 | |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 2420 | static void GRAPH_WRLOCK bdrv_replace_child_abort(void *opaque) |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2421 | { |
| 2422 | BdrvReplaceChildState *s = opaque; |
| 2423 | BlockDriverState *new_bs = s->child->bs; |
| 2424 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2425 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 2426 | assert_bdrv_graph_writable(); |
Kevin Wolf | ad29eb3 | 2023-09-11 11:46:07 +0200 | [diff] [blame] | 2427 | |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 2428 | /* old_bs reference is transparently moved from @s to @s->child */ |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2429 | if (!s->child->bs) { |
| 2430 | /* |
| 2431 | * The parents were undrained when removing old_bs from the child. New |
| 2432 | * requests can't have been made, though, because the child was empty. |
| 2433 | * |
| 2434 | * TODO Make bdrv_replace_child_noperm() transactionable to avoid |
| 2435 | * undraining the parent in the first place. Once this is done, having |
| 2436 | * new_bs drained when calling bdrv_replace_child_tran() is not a |
| 2437 | * requirement any more. |
| 2438 | */ |
Kevin Wolf | 606ed75 | 2022-11-18 18:41:10 +0100 | [diff] [blame] | 2439 | bdrv_parent_drained_begin_single(s->child); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2440 | assert(!bdrv_parent_drained_poll_single(s->child)); |
| 2441 | } |
| 2442 | assert(s->child->quiesced_parent); |
Vladimir Sementsov-Ogievskiy | 544acc7 | 2022-07-26 23:11:31 +0300 | [diff] [blame] | 2443 | bdrv_replace_child_noperm(s->child, s->old_bs); |
Kevin Wolf | ad29eb3 | 2023-09-11 11:46:07 +0200 | [diff] [blame] | 2444 | |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2445 | bdrv_unref(new_bs); |
| 2446 | } |
| 2447 | |
| 2448 | static TransactionActionDrv bdrv_replace_child_drv = { |
| 2449 | .commit = bdrv_replace_child_commit, |
| 2450 | .abort = bdrv_replace_child_abort, |
| 2451 | .clean = g_free, |
| 2452 | }; |
| 2453 | |
| 2454 | /* |
Vladimir Sementsov-Ogievskiy | 4bf021d | 2021-06-10 14:25:44 +0300 | [diff] [blame] | 2455 | * bdrv_replace_child_tran |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2456 | * |
| 2457 | * Note: real unref of old_bs is done only on commit. |
Vladimir Sementsov-Ogievskiy | 4bf021d | 2021-06-10 14:25:44 +0300 | [diff] [blame] | 2458 | * |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2459 | * Both @child->bs and @new_bs (if non-NULL) must be drained. @new_bs must be |
| 2460 | * kept drained until the transaction is completed. |
| 2461 | * |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 2462 | * After calling this function, the transaction @tran may only be completed |
| 2463 | * while holding a writer lock for the graph. |
| 2464 | * |
Vladimir Sementsov-Ogievskiy | 4bf021d | 2021-06-10 14:25:44 +0300 | [diff] [blame] | 2465 | * The function doesn't update permissions, caller is responsible for this. |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2466 | */ |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 2467 | static void GRAPH_WRLOCK |
| 2468 | bdrv_replace_child_tran(BdrvChild *child, BlockDriverState *new_bs, |
| 2469 | Transaction *tran) |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2470 | { |
| 2471 | BdrvReplaceChildState *s = g_new(BdrvReplaceChildState, 1); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2472 | |
| 2473 | assert(child->quiesced_parent); |
| 2474 | assert(!new_bs || new_bs->quiesce_counter); |
| 2475 | |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2476 | *s = (BdrvReplaceChildState) { |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 2477 | .child = child, |
| 2478 | .old_bs = child->bs, |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2479 | }; |
| 2480 | tran_add(tran, &bdrv_replace_child_drv, s); |
| 2481 | |
| 2482 | if (new_bs) { |
| 2483 | bdrv_ref(new_bs); |
| 2484 | } |
Kevin Wolf | ad29eb3 | 2023-09-11 11:46:07 +0200 | [diff] [blame] | 2485 | |
Vladimir Sementsov-Ogievskiy | 544acc7 | 2022-07-26 23:11:31 +0300 | [diff] [blame] | 2486 | bdrv_replace_child_noperm(child, new_bs); |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 2487 | /* old_bs reference is transparently moved from @child to @s */ |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2488 | } |
| 2489 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2490 | /* |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2491 | * Refresh permissions in @bs subtree. The function is intended to be called |
| 2492 | * after some graph modification that was done without permission update. |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2493 | * |
| 2494 | * After calling this function, the transaction @tran may only be completed |
| 2495 | * while holding a reader lock for the graph. |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2496 | */ |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2497 | static int GRAPH_RDLOCK |
| 2498 | bdrv_node_refresh_perm(BlockDriverState *bs, BlockReopenQueue *q, |
| 2499 | Transaction *tran, Error **errp) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2500 | { |
| 2501 | BlockDriver *drv = bs->drv; |
| 2502 | BdrvChild *c; |
| 2503 | int ret; |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2504 | uint64_t cumulative_perms, cumulative_shared_perms; |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2505 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2506 | |
| 2507 | bdrv_get_cumulative_perm(bs, &cumulative_perms, &cumulative_shared_perms); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2508 | |
| 2509 | /* Write permissions never work with read-only images */ |
| 2510 | if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) && |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2511 | !bdrv_is_writable_after_reopen(bs, q)) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2512 | { |
Max Reitz | 481e0ee | 2019-05-15 22:15:00 +0200 | [diff] [blame] | 2513 | if (!bdrv_is_writable_after_reopen(bs, NULL)) { |
| 2514 | error_setg(errp, "Block node is read-only"); |
| 2515 | } else { |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2516 | error_setg(errp, "Read-only block node '%s' cannot support " |
| 2517 | "read-write users", bdrv_get_node_name(bs)); |
Max Reitz | 481e0ee | 2019-05-15 22:15:00 +0200 | [diff] [blame] | 2518 | } |
| 2519 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2520 | return -EPERM; |
| 2521 | } |
| 2522 | |
Kevin Wolf | 9c60a5d | 2020-07-16 16:26:00 +0200 | [diff] [blame] | 2523 | /* |
| 2524 | * Unaligned requests will automatically be aligned to bl.request_alignment |
| 2525 | * and without RESIZE we can't extend requests to write to space beyond the |
| 2526 | * end of the image, so it's required that the image size is aligned. |
| 2527 | */ |
| 2528 | if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) && |
| 2529 | !(cumulative_perms & BLK_PERM_RESIZE)) |
| 2530 | { |
| 2531 | if ((bs->total_sectors * BDRV_SECTOR_SIZE) % bs->bl.request_alignment) { |
| 2532 | error_setg(errp, "Cannot get 'write' permission without 'resize': " |
| 2533 | "Image size is not a multiple of request " |
| 2534 | "alignment"); |
| 2535 | return -EPERM; |
| 2536 | } |
| 2537 | } |
| 2538 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2539 | /* Check this node */ |
| 2540 | if (!drv) { |
| 2541 | return 0; |
| 2542 | } |
| 2543 | |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2544 | 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] | 2545 | errp); |
| 2546 | if (ret < 0) { |
| 2547 | return ret; |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2548 | } |
| 2549 | |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 2550 | /* Drivers that never have children can omit .bdrv_child_perm() */ |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2551 | if (!drv->bdrv_child_perm) { |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 2552 | assert(QLIST_EMPTY(&bs->children)); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2553 | return 0; |
| 2554 | } |
| 2555 | |
| 2556 | /* Check all children */ |
| 2557 | QLIST_FOREACH(c, &bs->children, next) { |
| 2558 | uint64_t cur_perm, cur_shared; |
Max Reitz | 9eab154 | 2019-05-22 19:03:50 +0200 | [diff] [blame] | 2559 | |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2560 | bdrv_child_perm(bs, c->bs, c, c->role, q, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 2561 | cumulative_perms, cumulative_shared_perms, |
| 2562 | &cur_perm, &cur_shared); |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2563 | bdrv_child_set_perm(c, cur_perm, cur_shared, tran); |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2564 | } |
| 2565 | |
| 2566 | return 0; |
| 2567 | } |
| 2568 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2569 | /* |
| 2570 | * @list is a product of bdrv_topological_dfs() (may be called several times) - |
| 2571 | * a topologically sorted subgraph. |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2572 | * |
| 2573 | * After calling this function, the transaction @tran may only be completed |
| 2574 | * while holding a reader lock for the graph. |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2575 | */ |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 2576 | static int GRAPH_RDLOCK |
| 2577 | bdrv_do_refresh_perms(GSList *list, BlockReopenQueue *q, Transaction *tran, |
| 2578 | Error **errp) |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2579 | { |
| 2580 | int ret; |
| 2581 | BlockDriverState *bs; |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2582 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2583 | |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2584 | for ( ; list; list = list->next) { |
| 2585 | bs = list->data; |
| 2586 | |
Vladimir Sementsov-Ogievskiy | 9397c14 | 2021-04-28 18:17:53 +0300 | [diff] [blame] | 2587 | if (bdrv_parent_perms_conflict(bs, errp)) { |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2588 | return -EINVAL; |
| 2589 | } |
| 2590 | |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2591 | ret = bdrv_node_refresh_perm(bs, q, tran, errp); |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2592 | if (ret < 0) { |
| 2593 | return ret; |
| 2594 | } |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2595 | } |
Vladimir Sementsov-Ogievskiy | 3ef45e0 | 2021-04-28 18:17:40 +0300 | [diff] [blame] | 2596 | |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2597 | return 0; |
| 2598 | } |
| 2599 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2600 | /* |
| 2601 | * @list is any list of nodes. List is completed by all subtrees and |
| 2602 | * topologically sorted. It's not a problem if some node occurs in the @list |
| 2603 | * several times. |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2604 | * |
| 2605 | * After calling this function, the transaction @tran may only be completed |
| 2606 | * while holding a reader lock for the graph. |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2607 | */ |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 2608 | static int GRAPH_RDLOCK |
| 2609 | bdrv_list_refresh_perms(GSList *list, BlockReopenQueue *q, Transaction *tran, |
| 2610 | Error **errp) |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2611 | { |
| 2612 | g_autoptr(GHashTable) found = g_hash_table_new(NULL, NULL); |
| 2613 | g_autoptr(GSList) refresh_list = NULL; |
| 2614 | |
| 2615 | for ( ; list; list = list->next) { |
| 2616 | refresh_list = bdrv_topological_dfs(refresh_list, found, list->data); |
| 2617 | } |
| 2618 | |
| 2619 | return bdrv_do_refresh_perms(refresh_list, q, tran, errp); |
| 2620 | } |
| 2621 | |
Kevin Wolf | c7a0f2b | 2020-03-10 12:38:25 +0100 | [diff] [blame] | 2622 | void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm, |
| 2623 | uint64_t *shared_perm) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2624 | { |
| 2625 | BdrvChild *c; |
| 2626 | uint64_t cumulative_perms = 0; |
| 2627 | uint64_t cumulative_shared_perms = BLK_PERM_ALL; |
| 2628 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 2629 | GLOBAL_STATE_CODE(); |
| 2630 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2631 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
| 2632 | cumulative_perms |= c->perm; |
| 2633 | cumulative_shared_perms &= c->shared_perm; |
| 2634 | } |
| 2635 | |
| 2636 | *perm = cumulative_perms; |
| 2637 | *shared_perm = cumulative_shared_perms; |
| 2638 | } |
| 2639 | |
Fam Zheng | 5176196 | 2017-05-03 00:35:36 +0800 | [diff] [blame] | 2640 | char *bdrv_perm_names(uint64_t perm) |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2641 | { |
| 2642 | struct perm_name { |
| 2643 | uint64_t perm; |
| 2644 | const char *name; |
| 2645 | } permissions[] = { |
| 2646 | { BLK_PERM_CONSISTENT_READ, "consistent read" }, |
| 2647 | { BLK_PERM_WRITE, "write" }, |
| 2648 | { BLK_PERM_WRITE_UNCHANGED, "write unchanged" }, |
| 2649 | { BLK_PERM_RESIZE, "resize" }, |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2650 | { 0, NULL } |
| 2651 | }; |
| 2652 | |
Alberto Garcia | e2a7423 | 2020-01-10 18:15:18 +0100 | [diff] [blame] | 2653 | GString *result = g_string_sized_new(30); |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2654 | struct perm_name *p; |
| 2655 | |
| 2656 | for (p = permissions; p->name; p++) { |
| 2657 | if (perm & p->perm) { |
Alberto Garcia | e2a7423 | 2020-01-10 18:15:18 +0100 | [diff] [blame] | 2658 | if (result->len > 0) { |
| 2659 | g_string_append(result, ", "); |
| 2660 | } |
| 2661 | g_string_append(result, p->name); |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2662 | } |
| 2663 | } |
| 2664 | |
Alberto Garcia | e2a7423 | 2020-01-10 18:15:18 +0100 | [diff] [blame] | 2665 | return g_string_free(result, FALSE); |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2666 | } |
| 2667 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2668 | |
Kevin Wolf | bce73bc | 2023-09-11 11:46:13 +0200 | [diff] [blame] | 2669 | /* |
| 2670 | * @tran is allowed to be NULL. In this case no rollback is possible. |
| 2671 | * |
| 2672 | * After calling this function, the transaction @tran may only be completed |
| 2673 | * while holding a reader lock for the graph. |
| 2674 | */ |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 2675 | static int GRAPH_RDLOCK |
| 2676 | bdrv_refresh_perms(BlockDriverState *bs, Transaction *tran, Error **errp) |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 2677 | { |
| 2678 | int ret; |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2679 | Transaction *local_tran = NULL; |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2680 | g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs); |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2681 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 2682 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2683 | if (!tran) { |
| 2684 | tran = local_tran = tran_new(); |
| 2685 | } |
| 2686 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2687 | ret = bdrv_do_refresh_perms(list, NULL, tran, errp); |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2688 | |
| 2689 | if (local_tran) { |
| 2690 | tran_finalize(local_tran, ret); |
| 2691 | } |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 2692 | |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2693 | return ret; |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 2694 | } |
| 2695 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2696 | int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, |
| 2697 | Error **errp) |
| 2698 | { |
Max Reitz | 1046779 | 2019-05-22 19:03:51 +0200 | [diff] [blame] | 2699 | Error *local_err = NULL; |
Vladimir Sementsov-Ogievskiy | 83928dc | 2021-04-28 18:17:39 +0300 | [diff] [blame] | 2700 | Transaction *tran = tran_new(); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2701 | int ret; |
| 2702 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 2703 | GLOBAL_STATE_CODE(); |
| 2704 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2705 | bdrv_child_set_perm(c, perm, shared, tran); |
Vladimir Sementsov-Ogievskiy | 83928dc | 2021-04-28 18:17:39 +0300 | [diff] [blame] | 2706 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2707 | ret = bdrv_refresh_perms(c->bs, tran, &local_err); |
Vladimir Sementsov-Ogievskiy | 83928dc | 2021-04-28 18:17:39 +0300 | [diff] [blame] | 2708 | |
| 2709 | tran_finalize(tran, ret); |
| 2710 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2711 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | 071b474 | 2020-11-06 15:42:41 +0300 | [diff] [blame] | 2712 | if ((perm & ~c->perm) || (c->shared_perm & ~shared)) { |
| 2713 | /* tighten permissions */ |
Max Reitz | 1046779 | 2019-05-22 19:03:51 +0200 | [diff] [blame] | 2714 | error_propagate(errp, local_err); |
| 2715 | } else { |
| 2716 | /* |
| 2717 | * Our caller may intend to only loosen restrictions and |
| 2718 | * does not expect this function to fail. Errors are not |
| 2719 | * fatal in such a case, so we can just hide them from our |
| 2720 | * caller. |
| 2721 | */ |
| 2722 | error_free(local_err); |
| 2723 | ret = 0; |
| 2724 | } |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2725 | } |
| 2726 | |
Vladimir Sementsov-Ogievskiy | 83928dc | 2021-04-28 18:17:39 +0300 | [diff] [blame] | 2727 | return ret; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2728 | } |
| 2729 | |
Max Reitz | c1087f1 | 2019-05-22 19:03:46 +0200 | [diff] [blame] | 2730 | int bdrv_child_refresh_perms(BlockDriverState *bs, BdrvChild *c, Error **errp) |
| 2731 | { |
| 2732 | uint64_t parent_perms, parent_shared; |
| 2733 | uint64_t perms, shared; |
| 2734 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 2735 | GLOBAL_STATE_CODE(); |
| 2736 | |
Max Reitz | c1087f1 | 2019-05-22 19:03:46 +0200 | [diff] [blame] | 2737 | bdrv_get_cumulative_perm(bs, &parent_perms, &parent_shared); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2738 | bdrv_child_perm(bs, c->bs, c, c->role, NULL, |
Max Reitz | bf8e925 | 2020-05-13 13:05:16 +0200 | [diff] [blame] | 2739 | parent_perms, parent_shared, &perms, &shared); |
Max Reitz | c1087f1 | 2019-05-22 19:03:46 +0200 | [diff] [blame] | 2740 | |
| 2741 | return bdrv_child_try_set_perm(c, perms, shared, errp); |
| 2742 | } |
| 2743 | |
Max Reitz | 87278af | 2020-05-13 13:05:40 +0200 | [diff] [blame] | 2744 | /* |
| 2745 | * Default implementation for .bdrv_child_perm() for block filters: |
| 2746 | * Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED, and RESIZE to the |
| 2747 | * filtered child. |
| 2748 | */ |
| 2749 | static void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c, |
Max Reitz | 87278af | 2020-05-13 13:05:40 +0200 | [diff] [blame] | 2750 | BdrvChildRole role, |
| 2751 | BlockReopenQueue *reopen_queue, |
| 2752 | uint64_t perm, uint64_t shared, |
| 2753 | uint64_t *nperm, uint64_t *nshared) |
Kevin Wolf | 6a1b9ee | 2016-12-15 11:27:32 +0100 | [diff] [blame] | 2754 | { |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2755 | GLOBAL_STATE_CODE(); |
Kevin Wolf | e444fa8 | 2019-08-02 15:59:41 +0200 | [diff] [blame] | 2756 | *nperm = perm & DEFAULT_PERM_PASSTHROUGH; |
| 2757 | *nshared = (shared & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHANGED; |
Kevin Wolf | 6a1b9ee | 2016-12-15 11:27:32 +0100 | [diff] [blame] | 2758 | } |
| 2759 | |
Max Reitz | 70082db | 2020-05-13 13:05:26 +0200 | [diff] [blame] | 2760 | static void bdrv_default_perms_for_cow(BlockDriverState *bs, BdrvChild *c, |
Max Reitz | 70082db | 2020-05-13 13:05:26 +0200 | [diff] [blame] | 2761 | BdrvChildRole role, |
| 2762 | BlockReopenQueue *reopen_queue, |
| 2763 | uint64_t perm, uint64_t shared, |
| 2764 | uint64_t *nperm, uint64_t *nshared) |
| 2765 | { |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2766 | assert(role & BDRV_CHILD_COW); |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2767 | GLOBAL_STATE_CODE(); |
Max Reitz | 70082db | 2020-05-13 13:05:26 +0200 | [diff] [blame] | 2768 | |
| 2769 | /* |
| 2770 | * We want consistent read from backing files if the parent needs it. |
| 2771 | * No other operations are performed on backing files. |
| 2772 | */ |
| 2773 | perm &= BLK_PERM_CONSISTENT_READ; |
| 2774 | |
| 2775 | /* |
| 2776 | * If the parent can deal with changing data, we're okay with a |
| 2777 | * writable and resizable backing file. |
| 2778 | * TODO Require !(perm & BLK_PERM_CONSISTENT_READ), too? |
| 2779 | */ |
| 2780 | if (shared & BLK_PERM_WRITE) { |
| 2781 | shared = BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2782 | } else { |
| 2783 | shared = 0; |
| 2784 | } |
| 2785 | |
Vladimir Sementsov-Ogievskiy | 64631f3 | 2021-09-02 12:37:54 +0300 | [diff] [blame] | 2786 | shared |= BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED; |
Max Reitz | 70082db | 2020-05-13 13:05:26 +0200 | [diff] [blame] | 2787 | |
| 2788 | if (bs->open_flags & BDRV_O_INACTIVE) { |
| 2789 | shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2790 | } |
| 2791 | |
| 2792 | *nperm = perm; |
| 2793 | *nshared = shared; |
| 2794 | } |
| 2795 | |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2796 | static void bdrv_default_perms_for_storage(BlockDriverState *bs, BdrvChild *c, |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2797 | BdrvChildRole role, |
| 2798 | BlockReopenQueue *reopen_queue, |
| 2799 | uint64_t perm, uint64_t shared, |
| 2800 | uint64_t *nperm, uint64_t *nshared) |
| 2801 | { |
| 2802 | int flags; |
| 2803 | |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2804 | GLOBAL_STATE_CODE(); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2805 | assert(role & (BDRV_CHILD_METADATA | BDRV_CHILD_DATA)); |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2806 | |
| 2807 | flags = bdrv_reopen_get_flags(reopen_queue, bs); |
| 2808 | |
| 2809 | /* |
| 2810 | * Apart from the modifications below, the same permissions are |
| 2811 | * forwarded and left alone as for filters |
| 2812 | */ |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2813 | bdrv_filter_default_perms(bs, c, role, reopen_queue, |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2814 | perm, shared, &perm, &shared); |
| 2815 | |
Max Reitz | f889054 | 2020-05-13 13:05:28 +0200 | [diff] [blame] | 2816 | if (role & BDRV_CHILD_METADATA) { |
| 2817 | /* Format drivers may touch metadata even if the guest doesn't write */ |
| 2818 | if (bdrv_is_writable_after_reopen(bs, reopen_queue)) { |
| 2819 | perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2820 | } |
| 2821 | |
| 2822 | /* |
| 2823 | * bs->file always needs to be consistent because of the |
| 2824 | * metadata. We can never allow other users to resize or write |
| 2825 | * to it. |
| 2826 | */ |
| 2827 | if (!(flags & BDRV_O_NO_IO)) { |
| 2828 | perm |= BLK_PERM_CONSISTENT_READ; |
| 2829 | } |
| 2830 | shared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2831 | } |
| 2832 | |
Max Reitz | f889054 | 2020-05-13 13:05:28 +0200 | [diff] [blame] | 2833 | if (role & BDRV_CHILD_DATA) { |
| 2834 | /* |
| 2835 | * Technically, everything in this block is a subset of the |
| 2836 | * BDRV_CHILD_METADATA path taken above, and so this could |
| 2837 | * be an "else if" branch. However, that is not obvious, and |
| 2838 | * this function is not performance critical, therefore we let |
| 2839 | * this be an independent "if". |
| 2840 | */ |
| 2841 | |
| 2842 | /* |
| 2843 | * We cannot allow other users to resize the file because the |
| 2844 | * format driver might have some assumptions about the size |
| 2845 | * (e.g. because it is stored in metadata, or because the file |
| 2846 | * is split into fixed-size data files). |
| 2847 | */ |
| 2848 | shared &= ~BLK_PERM_RESIZE; |
| 2849 | |
| 2850 | /* |
| 2851 | * WRITE_UNCHANGED often cannot be performed as such on the |
| 2852 | * data file. For example, the qcow2 driver may still need to |
| 2853 | * write copied clusters on copy-on-read. |
| 2854 | */ |
| 2855 | if (perm & BLK_PERM_WRITE_UNCHANGED) { |
| 2856 | perm |= BLK_PERM_WRITE; |
| 2857 | } |
| 2858 | |
| 2859 | /* |
| 2860 | * If the data file is written to, the format driver may |
| 2861 | * expect to be able to resize it by writing beyond the EOF. |
| 2862 | */ |
| 2863 | if (perm & BLK_PERM_WRITE) { |
| 2864 | perm |= BLK_PERM_RESIZE; |
| 2865 | } |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2866 | } |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2867 | |
| 2868 | if (bs->open_flags & BDRV_O_INACTIVE) { |
| 2869 | shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2870 | } |
| 2871 | |
| 2872 | *nperm = perm; |
| 2873 | *nshared = shared; |
| 2874 | } |
| 2875 | |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2876 | void bdrv_default_perms(BlockDriverState *bs, BdrvChild *c, |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2877 | BdrvChildRole role, BlockReopenQueue *reopen_queue, |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2878 | uint64_t perm, uint64_t shared, |
| 2879 | uint64_t *nperm, uint64_t *nshared) |
| 2880 | { |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 2881 | GLOBAL_STATE_CODE(); |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2882 | if (role & BDRV_CHILD_FILTERED) { |
| 2883 | assert(!(role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA | |
| 2884 | BDRV_CHILD_COW))); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2885 | bdrv_filter_default_perms(bs, c, role, reopen_queue, |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2886 | perm, shared, nperm, nshared); |
| 2887 | } else if (role & BDRV_CHILD_COW) { |
| 2888 | assert(!(role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA))); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2889 | bdrv_default_perms_for_cow(bs, c, role, reopen_queue, |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2890 | perm, shared, nperm, nshared); |
| 2891 | } else if (role & (BDRV_CHILD_METADATA | BDRV_CHILD_DATA)) { |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2892 | bdrv_default_perms_for_storage(bs, c, role, reopen_queue, |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2893 | perm, shared, nperm, nshared); |
| 2894 | } else { |
| 2895 | g_assert_not_reached(); |
| 2896 | } |
| 2897 | } |
| 2898 | |
Max Reitz | 7b1d9c4 | 2019-11-08 13:34:51 +0100 | [diff] [blame] | 2899 | uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm) |
| 2900 | { |
| 2901 | static const uint64_t permissions[] = { |
| 2902 | [BLOCK_PERMISSION_CONSISTENT_READ] = BLK_PERM_CONSISTENT_READ, |
| 2903 | [BLOCK_PERMISSION_WRITE] = BLK_PERM_WRITE, |
| 2904 | [BLOCK_PERMISSION_WRITE_UNCHANGED] = BLK_PERM_WRITE_UNCHANGED, |
| 2905 | [BLOCK_PERMISSION_RESIZE] = BLK_PERM_RESIZE, |
Max Reitz | 7b1d9c4 | 2019-11-08 13:34:51 +0100 | [diff] [blame] | 2906 | }; |
| 2907 | |
| 2908 | QEMU_BUILD_BUG_ON(ARRAY_SIZE(permissions) != BLOCK_PERMISSION__MAX); |
| 2909 | QEMU_BUILD_BUG_ON(1UL << ARRAY_SIZE(permissions) != BLK_PERM_ALL + 1); |
| 2910 | |
| 2911 | assert(qapi_perm < BLOCK_PERMISSION__MAX); |
| 2912 | |
| 2913 | return permissions[qapi_perm]; |
| 2914 | } |
| 2915 | |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2916 | /* |
| 2917 | * Replaces the node that a BdrvChild points to without updating permissions. |
| 2918 | * |
| 2919 | * 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] | 2920 | * @child. |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2921 | */ |
Kevin Wolf | ad29eb3 | 2023-09-11 11:46:07 +0200 | [diff] [blame] | 2922 | static void GRAPH_WRLOCK |
| 2923 | bdrv_replace_child_noperm(BdrvChild *child, BlockDriverState *new_bs) |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2924 | { |
| 2925 | BlockDriverState *old_bs = child->bs; |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2926 | int new_bs_quiesce_counter; |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2927 | |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 2928 | assert(!child->frozen); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2929 | |
| 2930 | /* |
| 2931 | * If we want to change the BdrvChild to point to a drained node as its new |
| 2932 | * child->bs, we need to make sure that its new parent is drained, too. In |
| 2933 | * other words, either child->quiesce_parent must already be true or we must |
| 2934 | * be able to set it and keep the parent's quiesce_counter consistent with |
| 2935 | * that, but without polling or starting new requests (this function |
| 2936 | * guarantees that it doesn't poll, and starting new requests would be |
| 2937 | * against the invariants of drain sections). |
| 2938 | * |
| 2939 | * To keep things simple, we pick the first option (child->quiesce_parent |
| 2940 | * must already be true). We also generalise the rule a bit to make it |
| 2941 | * easier to verify in callers and more likely to be covered in test cases: |
| 2942 | * The parent must be quiesced through this child even if new_bs isn't |
| 2943 | * currently drained. |
| 2944 | * |
| 2945 | * The only exception is for callers that always pass new_bs == NULL. In |
| 2946 | * this case, we obviously never need to consider the case of a drained |
| 2947 | * new_bs, so we can keep the callers simpler by allowing them not to drain |
| 2948 | * the parent. |
| 2949 | */ |
| 2950 | assert(!new_bs || child->quiesced_parent); |
Kevin Wolf | bfb8aa6 | 2021-10-18 15:47:14 +0200 | [diff] [blame] | 2951 | assert(old_bs != new_bs); |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 2952 | GLOBAL_STATE_CODE(); |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 2953 | |
Fam Zheng | bb2614e | 2017-04-07 14:54:10 +0800 | [diff] [blame] | 2954 | if (old_bs && new_bs) { |
| 2955 | assert(bdrv_get_aio_context(old_bs) == bdrv_get_aio_context(new_bs)); |
| 2956 | } |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2957 | |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2958 | if (old_bs) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 2959 | if (child->klass->detach) { |
| 2960 | child->klass->detach(child); |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 2961 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2962 | QLIST_REMOVE(child, next_parent); |
| 2963 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2964 | |
| 2965 | child->bs = new_bs; |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2966 | |
| 2967 | if (new_bs) { |
| 2968 | QLIST_INSERT_HEAD(&new_bs->parents, child, next_parent); |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 2969 | if (child->klass->attach) { |
| 2970 | child->klass->attach(child); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 2971 | } |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2972 | } |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2973 | |
| 2974 | /* |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2975 | * If the parent was drained through this BdrvChild previously, but new_bs |
| 2976 | * is not drained, allow requests to come in only after the new node has |
| 2977 | * been attached. |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2978 | */ |
Kevin Wolf | 57e05be | 2022-11-18 18:41:06 +0100 | [diff] [blame] | 2979 | new_bs_quiesce_counter = (new_bs ? new_bs->quiesce_counter : 0); |
| 2980 | if (!new_bs_quiesce_counter && child->quiesced_parent) { |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2981 | bdrv_parent_drained_end_single(child); |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2982 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2983 | } |
| 2984 | |
Hanna Reitz | 04c9c3a | 2021-11-15 15:53:59 +0100 | [diff] [blame] | 2985 | /** |
| 2986 | * Free the given @child. |
| 2987 | * |
| 2988 | * The child must be empty (i.e. `child->bs == NULL`) and it must be |
| 2989 | * unused (i.e. not in a children list). |
| 2990 | */ |
| 2991 | static void bdrv_child_free(BdrvChild *child) |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 2992 | { |
| 2993 | assert(!child->bs); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2994 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 680e0cc | 2023-09-29 16:51:56 +0200 | [diff] [blame] | 2995 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 2996 | |
Hanna Reitz | a225369 | 2021-11-15 15:53:58 +0100 | [diff] [blame] | 2997 | assert(!child->next.le_prev); /* not in children list */ |
Hanna Reitz | 04c9c3a | 2021-11-15 15:53:59 +0100 | [diff] [blame] | 2998 | |
| 2999 | g_free(child->name); |
| 3000 | g_free(child); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3001 | } |
| 3002 | |
| 3003 | typedef struct BdrvAttachChildCommonState { |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3004 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3005 | AioContext *old_parent_ctx; |
| 3006 | AioContext *old_child_ctx; |
| 3007 | } BdrvAttachChildCommonState; |
| 3008 | |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 3009 | static void GRAPH_WRLOCK bdrv_attach_child_common_abort(void *opaque) |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3010 | { |
| 3011 | BdrvAttachChildCommonState *s = opaque; |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3012 | BlockDriverState *bs = s->child->bs; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3013 | |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 3014 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 3015 | assert_bdrv_graph_writable(); |
Kevin Wolf | ad29eb3 | 2023-09-11 11:46:07 +0200 | [diff] [blame] | 3016 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3017 | bdrv_replace_child_noperm(s->child, NULL); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3018 | |
| 3019 | if (bdrv_get_aio_context(bs) != s->old_child_ctx) { |
Emanuele Giuseppe Esposito | 142e690 | 2022-10-25 04:49:52 -0400 | [diff] [blame] | 3020 | 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] | 3021 | } |
| 3022 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3023 | 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] | 3024 | Transaction *tran; |
| 3025 | GHashTable *visited; |
| 3026 | bool ret; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3027 | |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3028 | tran = tran_new(); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3029 | |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3030 | /* No need to visit `child`, because it has been detached already */ |
| 3031 | visited = g_hash_table_new(NULL, NULL); |
| 3032 | ret = s->child->klass->change_aio_ctx(s->child, s->old_parent_ctx, |
| 3033 | visited, tran, &error_abort); |
| 3034 | g_hash_table_destroy(visited); |
| 3035 | |
| 3036 | /* transaction is supposed to always succeed */ |
| 3037 | assert(ret == true); |
| 3038 | tran_commit(tran); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3039 | } |
| 3040 | |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 3041 | bdrv_schedule_unref(bs); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3042 | bdrv_child_free(s->child); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3043 | } |
| 3044 | |
| 3045 | static TransactionActionDrv bdrv_attach_child_common_drv = { |
| 3046 | .abort = bdrv_attach_child_common_abort, |
| 3047 | .clean = g_free, |
| 3048 | }; |
| 3049 | |
| 3050 | /* |
| 3051 | * 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] | 3052 | * |
Vladimir Sementsov-Ogievskiy | 7ec390d | 2021-06-10 14:25:45 +0300 | [diff] [blame] | 3053 | * Function doesn't update permissions, caller is responsible for this. |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3054 | * |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 3055 | * After calling this function, the transaction @tran may only be completed |
| 3056 | * while holding a writer lock for the graph. |
| 3057 | * |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3058 | * Returns new created child. |
Kevin Wolf | c066e80 | 2023-06-05 10:57:05 +0200 | [diff] [blame] | 3059 | * |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 3060 | * Both @parent_bs and @child_bs can move to a different AioContext in this |
| 3061 | * function. |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3062 | */ |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3063 | static BdrvChild * GRAPH_WRLOCK |
| 3064 | bdrv_attach_child_common(BlockDriverState *child_bs, |
| 3065 | const char *child_name, |
| 3066 | const BdrvChildClass *child_class, |
| 3067 | BdrvChildRole child_role, |
| 3068 | uint64_t perm, uint64_t shared_perm, |
| 3069 | void *opaque, |
| 3070 | Transaction *tran, Error **errp) |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3071 | { |
| 3072 | BdrvChild *new_child; |
Stefan Hajnoczi | b49f475 | 2023-12-05 13:20:03 -0500 | [diff] [blame] | 3073 | AioContext *parent_ctx; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3074 | AioContext *child_ctx = bdrv_get_aio_context(child_bs); |
| 3075 | |
Vladimir Sementsov-Ogievskiy | da261b6 | 2021-06-01 10:52:17 +0300 | [diff] [blame] | 3076 | assert(child_class->get_parent_desc); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3077 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3078 | |
| 3079 | new_child = g_new(BdrvChild, 1); |
| 3080 | *new_child = (BdrvChild) { |
| 3081 | .bs = NULL, |
| 3082 | .name = g_strdup(child_name), |
| 3083 | .klass = child_class, |
| 3084 | .role = child_role, |
| 3085 | .perm = perm, |
| 3086 | .shared_perm = shared_perm, |
| 3087 | .opaque = opaque, |
| 3088 | }; |
| 3089 | |
| 3090 | /* |
| 3091 | * If the AioContexts don't match, first try to move the subtree of |
| 3092 | * child_bs into the AioContext of the new parent. If this doesn't work, |
| 3093 | * try moving the parent into the AioContext of child_bs instead. |
| 3094 | */ |
| 3095 | parent_ctx = bdrv_child_get_parent_aio_context(new_child); |
| 3096 | if (child_ctx != parent_ctx) { |
| 3097 | Error *local_err = NULL; |
Emanuele Giuseppe Esposito | 142e690 | 2022-10-25 04:49:52 -0400 | [diff] [blame] | 3098 | int ret = bdrv_try_change_aio_context(child_bs, parent_ctx, NULL, |
| 3099 | &local_err); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3100 | |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3101 | if (ret < 0 && child_class->change_aio_ctx) { |
Markus Armbruster | fb2575f | 2023-09-21 14:13:11 +0200 | [diff] [blame] | 3102 | Transaction *aio_ctx_tran = tran_new(); |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3103 | GHashTable *visited = g_hash_table_new(NULL, NULL); |
| 3104 | bool ret_child; |
| 3105 | |
| 3106 | g_hash_table_add(visited, new_child); |
| 3107 | ret_child = child_class->change_aio_ctx(new_child, child_ctx, |
Markus Armbruster | fb2575f | 2023-09-21 14:13:11 +0200 | [diff] [blame] | 3108 | visited, aio_ctx_tran, |
| 3109 | NULL); |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3110 | if (ret_child == true) { |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3111 | error_free(local_err); |
| 3112 | ret = 0; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3113 | } |
Markus Armbruster | fb2575f | 2023-09-21 14:13:11 +0200 | [diff] [blame] | 3114 | tran_finalize(aio_ctx_tran, ret_child == true ? 0 : -1); |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3115 | g_hash_table_destroy(visited); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3116 | } |
| 3117 | |
| 3118 | if (ret < 0) { |
| 3119 | error_propagate(errp, local_err); |
Hanna Reitz | 04c9c3a | 2021-11-15 15:53:59 +0100 | [diff] [blame] | 3120 | bdrv_child_free(new_child); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3121 | return NULL; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3122 | } |
| 3123 | } |
| 3124 | |
| 3125 | bdrv_ref(child_bs); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 3126 | /* |
| 3127 | * Let every new BdrvChild start with a drained parent. Inserting the child |
| 3128 | * in the graph with bdrv_replace_child_noperm() will undrain it if |
| 3129 | * @child_bs is not drained. |
| 3130 | * |
| 3131 | * The child was only just created and is not yet visible in global state |
| 3132 | * until bdrv_replace_child_noperm() inserts it into the graph, so nobody |
| 3133 | * could have sent requests and polling is not necessary. |
| 3134 | * |
| 3135 | * Note that this means that the parent isn't fully drained yet, we only |
| 3136 | * stop new requests from coming in. This is fine, we don't care about the |
| 3137 | * old requests here, they are not for this child. If another place enters a |
| 3138 | * drain section for the same parent, but wants it to be fully quiesced, it |
| 3139 | * will not run most of the the code in .drained_begin() again (which is not |
| 3140 | * a problem, we already did this), but it will still poll until the parent |
| 3141 | * is fully quiesced, so it will not be negatively affected either. |
| 3142 | */ |
Kevin Wolf | 606ed75 | 2022-11-18 18:41:10 +0100 | [diff] [blame] | 3143 | bdrv_parent_drained_begin_single(new_child); |
Vladimir Sementsov-Ogievskiy | 544acc7 | 2022-07-26 23:11:31 +0300 | [diff] [blame] | 3144 | bdrv_replace_child_noperm(new_child, child_bs); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3145 | |
| 3146 | BdrvAttachChildCommonState *s = g_new(BdrvAttachChildCommonState, 1); |
| 3147 | *s = (BdrvAttachChildCommonState) { |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3148 | .child = new_child, |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3149 | .old_parent_ctx = parent_ctx, |
| 3150 | .old_child_ctx = child_ctx, |
| 3151 | }; |
| 3152 | tran_add(tran, &bdrv_attach_child_common_drv, s); |
| 3153 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3154 | return new_child; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3155 | } |
| 3156 | |
Vladimir Sementsov-Ogievskiy | f8d2ad7 | 2021-06-01 10:52:13 +0300 | [diff] [blame] | 3157 | /* |
Vladimir Sementsov-Ogievskiy | 7ec390d | 2021-06-10 14:25:45 +0300 | [diff] [blame] | 3158 | * Function doesn't update permissions, caller is responsible for this. |
Kevin Wolf | c066e80 | 2023-06-05 10:57:05 +0200 | [diff] [blame] | 3159 | * |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 3160 | * Both @parent_bs and @child_bs can move to a different AioContext in this |
| 3161 | * function. |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 3162 | * |
| 3163 | * After calling this function, the transaction @tran may only be completed |
| 3164 | * while holding a writer lock for the graph. |
Vladimir Sementsov-Ogievskiy | f8d2ad7 | 2021-06-01 10:52:13 +0300 | [diff] [blame] | 3165 | */ |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3166 | static BdrvChild * GRAPH_WRLOCK |
| 3167 | bdrv_attach_child_noperm(BlockDriverState *parent_bs, |
| 3168 | BlockDriverState *child_bs, |
| 3169 | const char *child_name, |
| 3170 | const BdrvChildClass *child_class, |
| 3171 | BdrvChildRole child_role, |
| 3172 | Transaction *tran, |
| 3173 | Error **errp) |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3174 | { |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3175 | uint64_t perm, shared_perm; |
| 3176 | |
| 3177 | assert(parent_bs->drv); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3178 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3179 | |
Kevin Wolf | bfb8aa6 | 2021-10-18 15:47:14 +0200 | [diff] [blame] | 3180 | if (bdrv_recurse_has_child(child_bs, parent_bs)) { |
| 3181 | error_setg(errp, "Making '%s' a %s child of '%s' would create a cycle", |
| 3182 | child_bs->node_name, child_name, parent_bs->node_name); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3183 | return NULL; |
Kevin Wolf | bfb8aa6 | 2021-10-18 15:47:14 +0200 | [diff] [blame] | 3184 | } |
| 3185 | |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3186 | bdrv_get_cumulative_perm(parent_bs, &perm, &shared_perm); |
| 3187 | bdrv_child_perm(parent_bs, child_bs, NULL, child_role, NULL, |
| 3188 | perm, shared_perm, &perm, &shared_perm); |
| 3189 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3190 | return bdrv_attach_child_common(child_bs, child_name, child_class, |
| 3191 | child_role, perm, shared_perm, parent_bs, |
| 3192 | tran, errp); |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3193 | } |
| 3194 | |
Alberto Garcia | b441dc7 | 2019-05-13 16:46:18 +0300 | [diff] [blame] | 3195 | /* |
| 3196 | * This function steals the reference to child_bs from the caller. |
| 3197 | * That reference is later dropped by bdrv_root_unref_child(). |
| 3198 | * |
| 3199 | * On failure NULL is returned, errp is set and the reference to |
| 3200 | * child_bs is also dropped. |
| 3201 | */ |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3202 | BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, |
| 3203 | const char *child_name, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3204 | const BdrvChildClass *child_class, |
Max Reitz | 258b776 | 2020-05-13 13:05:15 +0200 | [diff] [blame] | 3205 | BdrvChildRole child_role, |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3206 | uint64_t perm, uint64_t shared_perm, |
| 3207 | void *opaque, Error **errp) |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3208 | { |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3209 | int ret; |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3210 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3211 | Transaction *tran = tran_new(); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3212 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 3213 | GLOBAL_STATE_CODE(); |
| 3214 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3215 | child = bdrv_attach_child_common(child_bs, child_name, child_class, |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3216 | child_role, perm, shared_perm, opaque, |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3217 | tran, errp); |
| 3218 | if (!child) { |
| 3219 | ret = -EINVAL; |
Kevin Wolf | e878bb1 | 2021-05-03 13:05:54 +0200 | [diff] [blame] | 3220 | goto out; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3221 | } |
| 3222 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 3223 | ret = bdrv_refresh_perms(child_bs, tran, errp); |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3224 | |
Kevin Wolf | e878bb1 | 2021-05-03 13:05:54 +0200 | [diff] [blame] | 3225 | out: |
| 3226 | tran_finalize(tran, ret); |
Vladimir Sementsov-Ogievskiy | f8d2ad7 | 2021-06-01 10:52:13 +0300 | [diff] [blame] | 3227 | |
Kevin Wolf | 03b9eac | 2023-10-27 17:53:13 +0200 | [diff] [blame] | 3228 | bdrv_schedule_unref(child_bs); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3229 | |
| 3230 | return ret < 0 ? NULL : child; |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3231 | } |
| 3232 | |
Alberto Garcia | b441dc7 | 2019-05-13 16:46:18 +0300 | [diff] [blame] | 3233 | /* |
| 3234 | * This function transfers the reference to child_bs from the caller |
| 3235 | * to parent_bs. That reference is later dropped by parent_bs on |
| 3236 | * bdrv_close() or if someone calls bdrv_unref_child(). |
| 3237 | * |
| 3238 | * On failure NULL is returned, errp is set and the reference to |
| 3239 | * child_bs is also dropped. |
| 3240 | */ |
Wen Congyang | 98292c6 | 2016-05-10 15:36:38 +0800 | [diff] [blame] | 3241 | BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, |
| 3242 | BlockDriverState *child_bs, |
| 3243 | const char *child_name, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3244 | const BdrvChildClass *child_class, |
Max Reitz | 258b776 | 2020-05-13 13:05:15 +0200 | [diff] [blame] | 3245 | BdrvChildRole child_role, |
Kevin Wolf | 8b2ff52 | 2016-12-20 22:21:17 +0100 | [diff] [blame] | 3246 | Error **errp) |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3247 | { |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3248 | int ret; |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3249 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3250 | Transaction *tran = tran_new(); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3251 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3252 | GLOBAL_STATE_CODE(); |
| 3253 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3254 | child = bdrv_attach_child_noperm(parent_bs, child_bs, child_name, |
| 3255 | child_class, child_role, tran, errp); |
| 3256 | if (!child) { |
| 3257 | ret = -EINVAL; |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3258 | goto out; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3259 | } |
| 3260 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 3261 | ret = bdrv_refresh_perms(parent_bs, tran, errp); |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3262 | if (ret < 0) { |
| 3263 | goto out; |
| 3264 | } |
| 3265 | |
| 3266 | out: |
| 3267 | tran_finalize(tran, ret); |
| 3268 | |
Kevin Wolf | afdaeb9 | 2023-09-11 11:46:11 +0200 | [diff] [blame] | 3269 | bdrv_schedule_unref(child_bs); |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3270 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3271 | return ret < 0 ? NULL : child; |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3272 | } |
| 3273 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 3274 | /* Callers must ensure that child->frozen is false. */ |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3275 | void bdrv_root_unref_child(BdrvChild *child) |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 3276 | { |
Vladimir Sementsov-Ogievskiy | 00eb93b | 2022-11-07 19:35:55 +0300 | [diff] [blame] | 3277 | BlockDriverState *child_bs = child->bs; |
Kevin Wolf | 779020c | 2015-10-13 14:09:44 +0200 | [diff] [blame] | 3278 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3279 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 00eb93b | 2022-11-07 19:35:55 +0300 | [diff] [blame] | 3280 | bdrv_replace_child_noperm(child, NULL); |
| 3281 | bdrv_child_free(child); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3282 | |
Vladimir Sementsov-Ogievskiy | 00eb93b | 2022-11-07 19:35:55 +0300 | [diff] [blame] | 3283 | if (child_bs) { |
| 3284 | /* |
| 3285 | * Update permissions for old node. We're just taking a parent away, so |
| 3286 | * we're loosening restrictions. Errors of permission update are not |
| 3287 | * fatal in this case, ignore them. |
| 3288 | */ |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 3289 | bdrv_refresh_perms(child_bs, NULL, NULL); |
Vladimir Sementsov-Ogievskiy | 00eb93b | 2022-11-07 19:35:55 +0300 | [diff] [blame] | 3290 | |
| 3291 | /* |
| 3292 | * When the parent requiring a non-default AioContext is removed, the |
| 3293 | * node moves back to the main AioContext |
| 3294 | */ |
| 3295 | bdrv_try_change_aio_context(child_bs, qemu_get_aio_context(), NULL, |
| 3296 | NULL); |
| 3297 | } |
| 3298 | |
Kevin Wolf | ede01e4 | 2023-09-11 11:46:18 +0200 | [diff] [blame] | 3299 | bdrv_schedule_unref(child_bs); |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3300 | } |
| 3301 | |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3302 | typedef struct BdrvSetInheritsFrom { |
| 3303 | BlockDriverState *bs; |
| 3304 | BlockDriverState *old_inherits_from; |
| 3305 | } BdrvSetInheritsFrom; |
| 3306 | |
| 3307 | static void bdrv_set_inherits_from_abort(void *opaque) |
| 3308 | { |
| 3309 | BdrvSetInheritsFrom *s = opaque; |
| 3310 | |
| 3311 | s->bs->inherits_from = s->old_inherits_from; |
| 3312 | } |
| 3313 | |
| 3314 | static TransactionActionDrv bdrv_set_inherits_from_drv = { |
| 3315 | .abort = bdrv_set_inherits_from_abort, |
| 3316 | .clean = g_free, |
| 3317 | }; |
| 3318 | |
| 3319 | /* @tran is allowed to be NULL. In this case no rollback is possible */ |
| 3320 | static void bdrv_set_inherits_from(BlockDriverState *bs, |
| 3321 | BlockDriverState *new_inherits_from, |
| 3322 | Transaction *tran) |
| 3323 | { |
| 3324 | if (tran) { |
| 3325 | BdrvSetInheritsFrom *s = g_new(BdrvSetInheritsFrom, 1); |
| 3326 | |
| 3327 | *s = (BdrvSetInheritsFrom) { |
| 3328 | .bs = bs, |
| 3329 | .old_inherits_from = bs->inherits_from, |
| 3330 | }; |
| 3331 | |
| 3332 | tran_add(tran, &bdrv_set_inherits_from_drv, s); |
| 3333 | } |
| 3334 | |
| 3335 | bs->inherits_from = new_inherits_from; |
| 3336 | } |
| 3337 | |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3338 | /** |
| 3339 | * Clear all inherits_from pointers from children and grandchildren of |
| 3340 | * @root that point to @root, where necessary. |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3341 | * @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] | 3342 | */ |
Kevin Wolf | 32a8aba | 2023-09-11 11:46:19 +0200 | [diff] [blame] | 3343 | static void GRAPH_WRLOCK |
| 3344 | bdrv_unset_inherits_from(BlockDriverState *root, BdrvChild *child, |
| 3345 | Transaction *tran) |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3346 | { |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3347 | BdrvChild *c; |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 3348 | |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3349 | if (child->bs->inherits_from == root) { |
| 3350 | /* |
| 3351 | * Remove inherits_from only when the last reference between root and |
| 3352 | * child->bs goes away. |
| 3353 | */ |
| 3354 | QLIST_FOREACH(c, &root->children, next) { |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 3355 | if (c != child && c->bs == child->bs) { |
| 3356 | break; |
| 3357 | } |
| 3358 | } |
| 3359 | if (c == NULL) { |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3360 | bdrv_set_inherits_from(child->bs, NULL, tran); |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 3361 | } |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 3362 | } |
| 3363 | |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3364 | QLIST_FOREACH(c, &child->bs->children, next) { |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3365 | bdrv_unset_inherits_from(root, c, tran); |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3366 | } |
| 3367 | } |
| 3368 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 3369 | /* Callers must ensure that child->frozen is false. */ |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3370 | void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) |
| 3371 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3372 | GLOBAL_STATE_CODE(); |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3373 | if (child == NULL) { |
| 3374 | return; |
| 3375 | } |
| 3376 | |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3377 | bdrv_unset_inherits_from(parent, child, NULL); |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3378 | bdrv_root_unref_child(child); |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 3379 | } |
| 3380 | |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 3381 | |
Kevin Wolf | 356f4ef | 2023-09-11 11:46:15 +0200 | [diff] [blame] | 3382 | static void GRAPH_RDLOCK |
| 3383 | bdrv_parent_cb_change_media(BlockDriverState *bs, bool load) |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 3384 | { |
| 3385 | BdrvChild *c; |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 3386 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 3387 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3388 | if (c->klass->change_media) { |
| 3389 | c->klass->change_media(c, load); |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 3390 | } |
| 3391 | } |
| 3392 | } |
| 3393 | |
Alberto Garcia | 0065c45 | 2018-10-31 18:16:37 +0200 | [diff] [blame] | 3394 | /* Return true if you can reach parent going through child->inherits_from |
| 3395 | * recursively. If parent or child are NULL, return false */ |
| 3396 | static bool bdrv_inherits_from_recursive(BlockDriverState *child, |
| 3397 | BlockDriverState *parent) |
| 3398 | { |
| 3399 | while (child && child != parent) { |
| 3400 | child = child->inherits_from; |
| 3401 | } |
| 3402 | |
| 3403 | return child != NULL; |
| 3404 | } |
| 3405 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3406 | /* |
Max Reitz | 25191e5 | 2020-05-13 13:05:33 +0200 | [diff] [blame] | 3407 | * Return the BdrvChildRole for @bs's backing child. bs->backing is |
| 3408 | * mostly used for COW backing children (role = COW), but also for |
| 3409 | * filtered children (role = FILTERED | PRIMARY). |
| 3410 | */ |
| 3411 | static BdrvChildRole bdrv_backing_role(BlockDriverState *bs) |
| 3412 | { |
| 3413 | if (bs->drv && bs->drv->is_filter) { |
| 3414 | return BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY; |
| 3415 | } else { |
| 3416 | return BDRV_CHILD_COW; |
| 3417 | } |
| 3418 | } |
| 3419 | |
| 3420 | /* |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3421 | * Sets the bs->backing or bs->file link of a BDS. A new reference is created; |
| 3422 | * 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] | 3423 | * |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3424 | * If the respective child is already present (i.e. we're detaching a node), |
| 3425 | * that child node must be drained. |
| 3426 | * |
Vladimir Sementsov-Ogievskiy | 7ec390d | 2021-06-10 14:25:45 +0300 | [diff] [blame] | 3427 | * Function doesn't update permissions, caller is responsible for this. |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 3428 | * |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 3429 | * Both @parent_bs and @child_bs can move to a different AioContext in this |
| 3430 | * function. |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 3431 | * |
| 3432 | * After calling this function, the transaction @tran may only be completed |
| 3433 | * while holding a writer lock for the graph. |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3434 | */ |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3435 | static int GRAPH_WRLOCK |
| 3436 | bdrv_set_file_or_backing_noperm(BlockDriverState *parent_bs, |
| 3437 | BlockDriverState *child_bs, |
| 3438 | bool is_backing, |
| 3439 | Transaction *tran, Error **errp) |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3440 | { |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3441 | bool update_inherits_from = |
| 3442 | bdrv_inherits_from_recursive(child_bs, parent_bs); |
| 3443 | BdrvChild *child = is_backing ? parent_bs->backing : parent_bs->file; |
| 3444 | BdrvChildRole role; |
Alberto Garcia | 0065c45 | 2018-10-31 18:16:37 +0200 | [diff] [blame] | 3445 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3446 | GLOBAL_STATE_CODE(); |
| 3447 | |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3448 | if (!parent_bs->drv) { |
| 3449 | /* |
| 3450 | * Node without drv is an object without a class :/. TODO: finally fix |
| 3451 | * qcow2 driver to never clear bs->drv and implement format corruption |
| 3452 | * handling in other way. |
| 3453 | */ |
| 3454 | error_setg(errp, "Node corrupted"); |
| 3455 | return -EINVAL; |
| 3456 | } |
| 3457 | |
| 3458 | if (child && child->frozen) { |
| 3459 | error_setg(errp, "Cannot change frozen '%s' link from '%s' to '%s'", |
| 3460 | child->name, parent_bs->node_name, child->bs->node_name); |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3461 | return -EPERM; |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 3462 | } |
| 3463 | |
Vladimir Sementsov-Ogievskiy | 25f78d9 | 2021-06-10 15:05:34 +0300 | [diff] [blame] | 3464 | if (is_backing && !parent_bs->drv->is_filter && |
| 3465 | !parent_bs->drv->supports_backing) |
| 3466 | { |
| 3467 | error_setg(errp, "Driver '%s' of node '%s' does not support backing " |
| 3468 | "files", parent_bs->drv->format_name, parent_bs->node_name); |
| 3469 | return -EINVAL; |
| 3470 | } |
| 3471 | |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3472 | if (parent_bs->drv->is_filter) { |
| 3473 | role = BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY; |
| 3474 | } else if (is_backing) { |
| 3475 | role = BDRV_CHILD_COW; |
| 3476 | } else { |
| 3477 | /* |
| 3478 | * We only can use same role as it is in existing child. We don't have |
| 3479 | * infrastructure to determine role of file child in generic way |
| 3480 | */ |
| 3481 | if (!child) { |
| 3482 | error_setg(errp, "Cannot set file child to format node without " |
| 3483 | "file child"); |
| 3484 | return -EINVAL; |
| 3485 | } |
| 3486 | role = child->role; |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 3487 | } |
| 3488 | |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3489 | if (child) { |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3490 | assert(child->bs->quiesce_counter); |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3491 | bdrv_unset_inherits_from(parent_bs, child, tran); |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 3492 | bdrv_remove_child(child, tran); |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3493 | } |
| 3494 | |
| 3495 | if (!child_bs) { |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3496 | goto out; |
| 3497 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 3498 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3499 | child = bdrv_attach_child_noperm(parent_bs, child_bs, |
| 3500 | is_backing ? "backing" : "file", |
| 3501 | &child_of_bds, role, |
| 3502 | tran, errp); |
| 3503 | if (!child) { |
| 3504 | return -EINVAL; |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3505 | } |
| 3506 | |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3507 | |
| 3508 | /* |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3509 | * 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] | 3510 | * point directly to bs (else it will become NULL). |
| 3511 | */ |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3512 | if (update_inherits_from) { |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3513 | bdrv_set_inherits_from(child_bs, parent_bs, tran); |
Alberto Garcia | 0065c45 | 2018-10-31 18:16:37 +0200 | [diff] [blame] | 3514 | } |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 3515 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3516 | out: |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3517 | bdrv_refresh_limits(parent_bs, tran, NULL); |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3518 | |
| 3519 | return 0; |
| 3520 | } |
| 3521 | |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 3522 | /* |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 3523 | * Both @bs and @backing_hd can move to a different AioContext in this |
| 3524 | * function. |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3525 | * |
| 3526 | * If a backing child is already present (i.e. we're detaching a node), that |
| 3527 | * child node must be drained. |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 3528 | */ |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3529 | int bdrv_set_backing_hd_drained(BlockDriverState *bs, |
| 3530 | BlockDriverState *backing_hd, |
| 3531 | Error **errp) |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3532 | { |
| 3533 | int ret; |
| 3534 | Transaction *tran = tran_new(); |
| 3535 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3536 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3537 | assert(bs->quiesce_counter > 0); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3538 | if (bs->backing) { |
| 3539 | assert(bs->backing->bs->quiesce_counter > 0); |
| 3540 | } |
Vladimir Sementsov-Ogievskiy | c0829cb | 2022-01-24 18:37:41 +0100 | [diff] [blame] | 3541 | |
Kevin Wolf | 3204c2e | 2023-10-27 17:53:23 +0200 | [diff] [blame] | 3542 | 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] | 3543 | if (ret < 0) { |
| 3544 | goto out; |
| 3545 | } |
| 3546 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 3547 | ret = bdrv_refresh_perms(bs, tran, errp); |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3548 | out: |
| 3549 | tran_finalize(tran, ret); |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3550 | return ret; |
| 3551 | } |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3552 | |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3553 | int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, |
| 3554 | Error **errp) |
| 3555 | { |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 3556 | BlockDriverState *drain_bs; |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3557 | int ret; |
| 3558 | GLOBAL_STATE_CODE(); |
| 3559 | |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 3560 | bdrv_graph_rdlock_main_loop(); |
| 3561 | drain_bs = bs->backing ? bs->backing->bs : bs; |
| 3562 | bdrv_graph_rdunlock_main_loop(); |
| 3563 | |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3564 | bdrv_ref(drain_bs); |
| 3565 | bdrv_drained_begin(drain_bs); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 3566 | bdrv_graph_wrlock(); |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3567 | ret = bdrv_set_backing_hd_drained(bs, backing_hd, errp); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 3568 | bdrv_graph_wrunlock(); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 3569 | bdrv_drained_end(drain_bs); |
| 3570 | bdrv_unref(drain_bs); |
Vladimir Sementsov-Ogievskiy | c0829cb | 2022-01-24 18:37:41 +0100 | [diff] [blame] | 3571 | |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3572 | return ret; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3573 | } |
| 3574 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 3575 | /* |
| 3576 | * Opens the backing file for a BlockDriverState if not yet open |
| 3577 | * |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3578 | * bdref_key specifies the key for the image's BlockdevRef in the options QDict. |
| 3579 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 3580 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 3581 | * BlockdevRef. |
| 3582 | * |
| 3583 | * TODO Can this be unified with bdrv_open_image()? |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 3584 | */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3585 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, |
| 3586 | const char *bdref_key, Error **errp) |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3587 | { |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 3588 | char *backing_filename = NULL; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3589 | char *bdref_key_dot; |
| 3590 | const char *reference = NULL; |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 3591 | int ret = 0; |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 3592 | bool implicit_backing = false; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3593 | BlockDriverState *backing_hd; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3594 | QDict *options; |
| 3595 | QDict *tmp_parent_options = NULL; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 3596 | Error *local_err = NULL; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3597 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3598 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 3599 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3600 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3601 | if (bs->backing != NULL) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3602 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3603 | } |
| 3604 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 3605 | /* NULL means an empty set of options */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3606 | if (parent_options == NULL) { |
| 3607 | tmp_parent_options = qdict_new(); |
| 3608 | parent_options = tmp_parent_options; |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 3609 | } |
| 3610 | |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3611 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3612 | |
| 3613 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 3614 | qdict_extract_subqdict(parent_options, &options, bdref_key_dot); |
| 3615 | g_free(bdref_key_dot); |
| 3616 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 3617 | /* |
| 3618 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 3619 | * types would require more care. When @parent_options come from |
| 3620 | * -blockdev or blockdev_add, its members are typed according to |
| 3621 | * the QAPI schema, but when they come from -drive, they're all |
| 3622 | * QString. |
| 3623 | */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3624 | reference = qdict_get_try_str(parent_options, bdref_key); |
| 3625 | if (reference || qdict_haskey(options, "file.filename")) { |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 3626 | /* keep backing_filename NULL */ |
Kevin Wolf | 1cb6f50 | 2013-04-12 20:27:07 +0200 | [diff] [blame] | 3627 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3628 | qobject_unref(options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3629 | goto free_exit; |
Fam Zheng | dbecebd | 2013-09-22 20:05:06 +0800 | [diff] [blame] | 3630 | } else { |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 3631 | if (qdict_size(options) == 0) { |
| 3632 | /* If the user specifies options that do not modify the |
| 3633 | * backing file's behavior, we might still consider it the |
| 3634 | * implicit backing file. But it's easier this way, and |
| 3635 | * just specifying some of the backing BDS's options is |
| 3636 | * only possible with -drive anyway (otherwise the QAPI |
| 3637 | * schema forces the user to specify everything). */ |
| 3638 | implicit_backing = !strcmp(bs->auto_backing_file, bs->backing_file); |
| 3639 | } |
| 3640 | |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 3641 | backing_filename = bdrv_get_full_backing_filename(bs, &local_err); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 3642 | if (local_err) { |
| 3643 | ret = -EINVAL; |
| 3644 | error_propagate(errp, local_err); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3645 | qobject_unref(options); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 3646 | goto free_exit; |
| 3647 | } |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3648 | } |
| 3649 | |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 3650 | if (!bs->drv || !bs->drv->supports_backing) { |
| 3651 | ret = -EINVAL; |
| 3652 | error_setg(errp, "Driver doesn't support backing files"); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3653 | qobject_unref(options); |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 3654 | goto free_exit; |
| 3655 | } |
| 3656 | |
Peter Krempa | 6bff597 | 2017-10-12 16:14:10 +0200 | [diff] [blame] | 3657 | if (!reference && |
| 3658 | bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 3659 | qdict_put_str(options, "driver", bs->backing_format); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3660 | } |
| 3661 | |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 3662 | backing_hd = bdrv_open_inherit(backing_filename, reference, options, 0, bs, |
Max Reitz | 25191e5 | 2020-05-13 13:05:33 +0200 | [diff] [blame] | 3663 | &child_of_bds, bdrv_backing_role(bs), errp); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3664 | if (!backing_hd) { |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3665 | bs->open_flags |= BDRV_O_NO_BACKING; |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 3666 | error_prepend(errp, "Could not open backing file: "); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3667 | ret = -EINVAL; |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3668 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3669 | } |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3670 | |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 3671 | if (implicit_backing) { |
| 3672 | bdrv_refresh_filename(backing_hd); |
| 3673 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), |
| 3674 | backing_hd->filename); |
| 3675 | } |
| 3676 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3677 | /* Hook up the backing file link; drop our reference, bs owns the |
| 3678 | * backing_hd reference now */ |
Vladimir Sementsov-Ogievskiy | dc9c10a | 2021-02-02 15:49:47 +0300 | [diff] [blame] | 3679 | ret = bdrv_set_backing_hd(bs, backing_hd, errp); |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3680 | bdrv_unref(backing_hd); |
Kevin Wolf | 8aa0454 | 2023-06-05 10:57:08 +0200 | [diff] [blame] | 3681 | |
Vladimir Sementsov-Ogievskiy | dc9c10a | 2021-02-02 15:49:47 +0300 | [diff] [blame] | 3682 | if (ret < 0) { |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 3683 | goto free_exit; |
| 3684 | } |
Peter Feiner | d80ac65 | 2014-01-08 19:43:25 +0000 | [diff] [blame] | 3685 | |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3686 | qdict_del(parent_options, bdref_key); |
| 3687 | |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3688 | free_exit: |
| 3689 | g_free(backing_filename); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3690 | qobject_unref(tmp_parent_options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3691 | return ret; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3692 | } |
| 3693 | |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3694 | static BlockDriverState * |
| 3695 | 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] | 3696 | BlockDriverState *parent, const BdrvChildClass *child_class, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 3697 | BdrvChildRole child_role, bool allow_none, Error **errp) |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3698 | { |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3699 | BlockDriverState *bs = NULL; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3700 | QDict *image_options; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3701 | char *bdref_key_dot; |
| 3702 | const char *reference; |
| 3703 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3704 | assert(child_class != NULL); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3705 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3706 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 3707 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); |
| 3708 | g_free(bdref_key_dot); |
| 3709 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 3710 | /* |
| 3711 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 3712 | * types would require more care. When @options come from |
| 3713 | * -blockdev or blockdev_add, its members are typed according to |
| 3714 | * the QAPI schema, but when they come from -drive, they're all |
| 3715 | * QString. |
| 3716 | */ |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3717 | reference = qdict_get_try_str(options, bdref_key); |
| 3718 | if (!filename && !reference && !qdict_size(image_options)) { |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 3719 | if (!allow_none) { |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3720 | error_setg(errp, "A block device must be specified for \"%s\"", |
| 3721 | bdref_key); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3722 | } |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3723 | qobject_unref(image_options); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3724 | goto done; |
| 3725 | } |
| 3726 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3727 | bs = bdrv_open_inherit(filename, reference, image_options, 0, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 3728 | parent, child_class, child_role, errp); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3729 | if (!bs) { |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3730 | goto done; |
| 3731 | } |
| 3732 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3733 | done: |
| 3734 | qdict_del(options, bdref_key); |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3735 | return bs; |
| 3736 | } |
| 3737 | |
| 3738 | /* |
| 3739 | * Opens a disk image whose options are given as BlockdevRef in another block |
| 3740 | * device's options. |
| 3741 | * |
| 3742 | * If allow_none is true, no image will be opened if filename is false and no |
| 3743 | * BlockdevRef is given. NULL will be returned, but errp remains unset. |
| 3744 | * |
| 3745 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. |
| 3746 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 3747 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 3748 | * BlockdevRef. |
| 3749 | * |
| 3750 | * The BlockdevRef will be removed from the options QDict. |
Kevin Wolf | aa269ff | 2023-05-25 14:47:07 +0200 | [diff] [blame] | 3751 | * |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 3752 | * @parent can move to a different AioContext in this function. |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3753 | */ |
| 3754 | BdrvChild *bdrv_open_child(const char *filename, |
| 3755 | QDict *options, const char *bdref_key, |
| 3756 | BlockDriverState *parent, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3757 | const BdrvChildClass *child_class, |
Max Reitz | 258b776 | 2020-05-13 13:05:15 +0200 | [diff] [blame] | 3758 | BdrvChildRole child_role, |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3759 | bool allow_none, Error **errp) |
| 3760 | { |
| 3761 | BlockDriverState *bs; |
Kevin Wolf | 8394c35 | 2023-06-05 10:57:04 +0200 | [diff] [blame] | 3762 | BdrvChild *child; |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3763 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3764 | GLOBAL_STATE_CODE(); |
| 3765 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3766 | bs = bdrv_open_child_bs(filename, options, bdref_key, parent, child_class, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 3767 | child_role, allow_none, errp); |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3768 | if (bs == NULL) { |
| 3769 | return NULL; |
| 3770 | } |
| 3771 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 3772 | bdrv_graph_wrlock(); |
Kevin Wolf | 8394c35 | 2023-06-05 10:57:04 +0200 | [diff] [blame] | 3773 | child = bdrv_attach_child(parent, bs, bdref_key, child_class, child_role, |
| 3774 | errp); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 3775 | bdrv_graph_wrunlock(); |
Kevin Wolf | 8394c35 | 2023-06-05 10:57:04 +0200 | [diff] [blame] | 3776 | |
| 3777 | return child; |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 3778 | } |
| 3779 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3780 | /* |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3781 | * Wrapper on bdrv_open_child() for most popular case: open primary child of bs. |
Kevin Wolf | aa269ff | 2023-05-25 14:47:07 +0200 | [diff] [blame] | 3782 | * |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 3783 | * @parent can move to a different AioContext in this function. |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3784 | */ |
| 3785 | int bdrv_open_file_child(const char *filename, |
| 3786 | QDict *options, const char *bdref_key, |
| 3787 | BlockDriverState *parent, Error **errp) |
| 3788 | { |
| 3789 | BdrvChildRole role; |
| 3790 | |
| 3791 | /* commit_top and mirror_top don't use this function */ |
| 3792 | assert(!parent->drv->filtered_child_is_backing); |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3793 | role = parent->drv->is_filter ? |
| 3794 | (BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY) : BDRV_CHILD_IMAGE; |
| 3795 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3796 | if (!bdrv_open_child(filename, options, bdref_key, parent, |
| 3797 | &child_of_bds, role, false, errp)) |
| 3798 | { |
| 3799 | return -EINVAL; |
| 3800 | } |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3801 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3802 | return 0; |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3803 | } |
| 3804 | |
| 3805 | /* |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3806 | * TODO Future callers may need to specify parent/child_class in order for |
| 3807 | * option inheritance to work. Existing callers use it for the root node. |
| 3808 | */ |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3809 | BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp) |
| 3810 | { |
| 3811 | BlockDriverState *bs = NULL; |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3812 | QObject *obj = NULL; |
| 3813 | QDict *qdict = NULL; |
| 3814 | const char *reference = NULL; |
| 3815 | Visitor *v = NULL; |
| 3816 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3817 | GLOBAL_STATE_CODE(); |
| 3818 | |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3819 | if (ref->type == QTYPE_QSTRING) { |
| 3820 | reference = ref->u.reference; |
| 3821 | } else { |
| 3822 | BlockdevOptions *options = &ref->u.definition; |
| 3823 | assert(ref->type == QTYPE_QDICT); |
| 3824 | |
| 3825 | v = qobject_output_visitor_new(&obj); |
Markus Armbruster | 1f58424 | 2020-04-24 10:43:35 +0200 | [diff] [blame] | 3826 | visit_type_BlockdevOptions(v, NULL, &options, &error_abort); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3827 | visit_complete(v, &obj); |
| 3828 | |
Max Reitz | 7dc847e | 2018-02-24 16:40:29 +0100 | [diff] [blame] | 3829 | qdict = qobject_to(QDict, obj); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3830 | qdict_flatten(qdict); |
| 3831 | |
| 3832 | /* bdrv_open_inherit() defaults to the values in bdrv_flags (for |
| 3833 | * compatibility with other callers) rather than what we want as the |
| 3834 | * real defaults. Apply the defaults here instead. */ |
| 3835 | qdict_set_default_str(qdict, BDRV_OPT_CACHE_DIRECT, "off"); |
| 3836 | qdict_set_default_str(qdict, BDRV_OPT_CACHE_NO_FLUSH, "off"); |
| 3837 | qdict_set_default_str(qdict, BDRV_OPT_READ_ONLY, "off"); |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 3838 | qdict_set_default_str(qdict, BDRV_OPT_AUTO_READ_ONLY, "off"); |
| 3839 | |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3840 | } |
| 3841 | |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 3842 | bs = bdrv_open_inherit(NULL, reference, qdict, 0, NULL, NULL, 0, errp); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3843 | obj = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3844 | qobject_unref(obj); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3845 | visit_free(v); |
| 3846 | return bs; |
| 3847 | } |
| 3848 | |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 3849 | static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs, |
| 3850 | int flags, |
| 3851 | QDict *snapshot_options, |
| 3852 | Error **errp) |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3853 | { |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 3854 | g_autofree char *tmp_filename = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3855 | int64_t total_size; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3856 | QemuOpts *opts = NULL; |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 3857 | BlockDriverState *bs_snapshot = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3858 | int ret; |
| 3859 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3860 | GLOBAL_STATE_CODE(); |
| 3861 | |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3862 | /* if snapshot, we create a temporary backing file and open it |
| 3863 | instead of opening 'filename' directly */ |
| 3864 | |
| 3865 | /* Get the required size from the image */ |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 3866 | total_size = bdrv_getlength(bs); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 3867 | |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 3868 | if (total_size < 0) { |
| 3869 | error_setg_errno(errp, -total_size, "Could not get image size"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3870 | goto out; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 3871 | } |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3872 | |
| 3873 | /* Create the temporary image */ |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 3874 | tmp_filename = create_tmp_file(errp); |
| 3875 | if (!tmp_filename) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3876 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3877 | } |
| 3878 | |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 3879 | opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0, |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 3880 | &error_abort); |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 3881 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size, &error_abort); |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 3882 | ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, errp); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3883 | qemu_opts_del(opts); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3884 | if (ret < 0) { |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 3885 | error_prepend(errp, "Could not create temporary overlay '%s': ", |
| 3886 | tmp_filename); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3887 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3888 | } |
| 3889 | |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 3890 | /* Prepare options QDict for the temporary file */ |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 3891 | qdict_put_str(snapshot_options, "file.driver", "file"); |
| 3892 | qdict_put_str(snapshot_options, "file.filename", tmp_filename); |
| 3893 | qdict_put_str(snapshot_options, "driver", "qcow2"); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3894 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3895 | bs_snapshot = bdrv_open(NULL, NULL, snapshot_options, flags, errp); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 3896 | snapshot_options = NULL; |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3897 | if (!bs_snapshot) { |
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 | |
Vladimir Sementsov-Ogievskiy | 934aee1 | 2021-02-02 15:49:44 +0300 | [diff] [blame] | 3901 | ret = bdrv_append(bs_snapshot, bs, errp); |
| 3902 | if (ret < 0) { |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 3903 | bs_snapshot = NULL; |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 3904 | goto out; |
| 3905 | } |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3906 | |
| 3907 | out: |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3908 | qobject_unref(snapshot_options); |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 3909 | return bs_snapshot; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3910 | } |
| 3911 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3912 | /* |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 3913 | * Opens a disk image (raw, qcow2, vmdk, ...) |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 3914 | * |
| 3915 | * options is a QDict of options to pass to the block drivers, or NULL for an |
| 3916 | * empty set of options. The reference to the QDict belongs to the block layer |
| 3917 | * 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] | 3918 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3919 | * |
| 3920 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. |
| 3921 | * If it is not NULL, the referenced BDS will be reused. |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3922 | * |
| 3923 | * The reference parameter may be used to specify an existing block device which |
| 3924 | * should be opened. If specified, neither options nor a filename may be given, |
| 3925 | * 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] | 3926 | */ |
Kevin Wolf | 3219230 | 2023-01-26 18:24:32 +0100 | [diff] [blame] | 3927 | static BlockDriverState * no_coroutine_fn |
| 3928 | bdrv_open_inherit(const char *filename, const char *reference, QDict *options, |
| 3929 | int flags, BlockDriverState *parent, |
| 3930 | const BdrvChildClass *child_class, BdrvChildRole child_role, |
| 3931 | Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3932 | { |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 3933 | int ret; |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 3934 | BlockBackend *file = NULL; |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 3935 | BlockDriverState *bs; |
Max Reitz | ce34377 | 2015-08-26 19:47:50 +0200 | [diff] [blame] | 3936 | BlockDriver *drv = NULL; |
Alberto Garcia | 2f624b8 | 2018-06-29 14:37:00 +0300 | [diff] [blame] | 3937 | BdrvChild *child; |
Kevin Wolf | 74fe54f | 2013-07-09 11:09:02 +0200 | [diff] [blame] | 3938 | const char *drvname; |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 3939 | const char *backing; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 3940 | Error *local_err = NULL; |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 3941 | QDict *snapshot_options = NULL; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 3942 | int snapshot_flags = 0; |
bellard | 712e787 | 2005-04-28 21:09:32 +0000 | [diff] [blame] | 3943 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3944 | assert(!child_class || !flags); |
| 3945 | assert(!child_class == !parent); |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 3946 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 3219230 | 2023-01-26 18:24:32 +0100 | [diff] [blame] | 3947 | assert(!qemu_in_coroutine()); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3948 | |
Kevin Wolf | 356f4ef | 2023-09-11 11:46:15 +0200 | [diff] [blame] | 3949 | /* TODO We'll eventually have to take a writer lock in this function */ |
| 3950 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 3951 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3952 | if (reference) { |
| 3953 | bool options_non_empty = options ? qdict_size(options) : false; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3954 | qobject_unref(options); |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3955 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3956 | if (filename || options_non_empty) { |
| 3957 | error_setg(errp, "Cannot reference an existing block device with " |
| 3958 | "additional options or a new filename"); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3959 | return NULL; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3960 | } |
| 3961 | |
| 3962 | bs = bdrv_lookup_bs(reference, reference, errp); |
| 3963 | if (!bs) { |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3964 | return NULL; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3965 | } |
Kevin Wolf | 76b2232 | 2016-04-04 17:11:13 +0200 | [diff] [blame] | 3966 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3967 | bdrv_ref(bs); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3968 | return bs; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3969 | } |
| 3970 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3971 | bs = bdrv_new(); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3972 | |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 3973 | /* NULL means an empty set of options */ |
| 3974 | if (options == NULL) { |
| 3975 | options = qdict_new(); |
| 3976 | } |
| 3977 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 3978 | /* json: syntax counts as explicit options, as if in the QDict */ |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 3979 | parse_json_protocol(options, &filename, &local_err); |
| 3980 | if (local_err) { |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 3981 | goto fail; |
| 3982 | } |
| 3983 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 3984 | bs->explicit_options = qdict_clone_shallow(options); |
| 3985 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3986 | if (child_class) { |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 3987 | bool parent_is_format; |
| 3988 | |
| 3989 | if (parent->drv) { |
| 3990 | parent_is_format = parent->drv->is_format; |
| 3991 | } else { |
| 3992 | /* |
| 3993 | * parent->drv is not set yet because this node is opened for |
| 3994 | * (potential) format probing. That means that @parent is going |
| 3995 | * to be a format node. |
| 3996 | */ |
| 3997 | parent_is_format = true; |
| 3998 | } |
| 3999 | |
Kevin Wolf | bddcec3 | 2015-04-09 18:47:50 +0200 | [diff] [blame] | 4000 | bs->inherits_from = parent; |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4001 | child_class->inherit_options(child_role, parent_is_format, |
| 4002 | &flags, options, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 4003 | parent->open_flags, parent->options); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 4004 | } |
| 4005 | |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 4006 | ret = bdrv_fill_options(&options, filename, &flags, &local_err); |
Philippe Mathieu-Daudé | dfde483 | 2020-04-22 15:31:44 +0200 | [diff] [blame] | 4007 | if (ret < 0) { |
Kevin Wolf | 462f5bc | 2014-05-26 11:39:55 +0200 | [diff] [blame] | 4008 | goto fail; |
| 4009 | } |
| 4010 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 4011 | /* |
| 4012 | * Set the BDRV_O_RDWR and BDRV_O_ALLOW_RDWR flags. |
| 4013 | * Caution: getting a boolean member of @options requires care. |
| 4014 | * When @options come from -blockdev or blockdev_add, members are |
| 4015 | * typed according to the QAPI schema, but when they come from |
| 4016 | * -drive, they're all QString. |
| 4017 | */ |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 4018 | if (g_strcmp0(qdict_get_try_str(options, BDRV_OPT_READ_ONLY), "on") && |
| 4019 | !qdict_get_try_bool(options, BDRV_OPT_READ_ONLY, false)) { |
| 4020 | flags |= (BDRV_O_RDWR | BDRV_O_ALLOW_RDWR); |
| 4021 | } else { |
| 4022 | flags &= ~BDRV_O_RDWR; |
Alberto Garcia | 14499ea | 2016-09-15 17:53:00 +0300 | [diff] [blame] | 4023 | } |
| 4024 | |
| 4025 | if (flags & BDRV_O_SNAPSHOT) { |
| 4026 | snapshot_options = qdict_new(); |
| 4027 | bdrv_temp_snapshot_options(&snapshot_flags, snapshot_options, |
| 4028 | flags, options); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 4029 | /* Let bdrv_backing_options() override "read-only" */ |
| 4030 | qdict_del(options, BDRV_OPT_READ_ONLY); |
Max Reitz | 00ff7ff | 2020-05-13 13:05:21 +0200 | [diff] [blame] | 4031 | bdrv_inherited_options(BDRV_CHILD_COW, true, |
| 4032 | &flags, options, flags, options); |
Alberto Garcia | 14499ea | 2016-09-15 17:53:00 +0300 | [diff] [blame] | 4033 | } |
| 4034 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 4035 | bs->open_flags = flags; |
| 4036 | bs->options = options; |
| 4037 | options = qdict_clone_shallow(options); |
| 4038 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4039 | /* Find the right image format driver */ |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 4040 | /* See cautionary note on accessing @options above */ |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4041 | drvname = qdict_get_try_str(options, "driver"); |
| 4042 | if (drvname) { |
| 4043 | drv = bdrv_find_format(drvname); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4044 | if (!drv) { |
| 4045 | error_setg(errp, "Unknown driver: '%s'", drvname); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4046 | goto fail; |
| 4047 | } |
| 4048 | } |
| 4049 | |
| 4050 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4051 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 4052 | /* See cautionary note on accessing @options above */ |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 4053 | backing = qdict_get_try_str(options, "backing"); |
Max Reitz | e59a0cf | 2018-02-24 16:40:32 +0100 | [diff] [blame] | 4054 | if (qobject_to(QNull, qdict_get(options, "backing")) != NULL || |
| 4055 | (backing && *backing == '\0')) |
| 4056 | { |
Max Reitz | 4f7be28 | 2018-02-24 16:40:33 +0100 | [diff] [blame] | 4057 | if (backing) { |
| 4058 | warn_report("Use of \"backing\": \"\" is deprecated; " |
| 4059 | "use \"backing\": null instead"); |
| 4060 | } |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 4061 | flags |= BDRV_O_NO_BACKING; |
Kevin Wolf | ae0f57f | 2019-11-08 09:36:35 +0100 | [diff] [blame] | 4062 | qdict_del(bs->explicit_options, "backing"); |
| 4063 | qdict_del(bs->options, "backing"); |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 4064 | qdict_del(options, "backing"); |
| 4065 | } |
| 4066 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4067 | /* Open image file without format layer. This BlockBackend is only used for |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 4068 | * probing, the block drivers will do their own bdrv_open_child() for the |
| 4069 | * 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] | 4070 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4071 | BlockDriverState *file_bs; |
| 4072 | |
| 4073 | file_bs = bdrv_open_child_bs(filename, options, "file", bs, |
Max Reitz | 5894440 | 2020-05-13 13:05:37 +0200 | [diff] [blame] | 4074 | &child_of_bds, BDRV_CHILD_IMAGE, |
| 4075 | true, &local_err); |
Kevin Wolf | 1fdd693 | 2015-06-15 14:11:51 +0200 | [diff] [blame] | 4076 | if (local_err) { |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 4077 | goto fail; |
| 4078 | } |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4079 | if (file_bs != NULL) { |
Kevin Wolf | dacaa16 | 2017-11-20 14:59:13 +0100 | [diff] [blame] | 4080 | /* Not requesting BLK_PERM_CONSISTENT_READ because we're only |
| 4081 | * looking at the header to guess the image format. This works even |
| 4082 | * in cases where a guest would not see a consistent state. */ |
Stefan Hajnoczi | b49f475 | 2023-12-05 13:20:03 -0500 | [diff] [blame] | 4083 | AioContext *ctx = bdrv_get_aio_context(file_bs); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4084 | file = blk_new(ctx, 0, BLK_PERM_ALL); |
Kevin Wolf | d708642 | 2017-01-13 19:02:32 +0100 | [diff] [blame] | 4085 | blk_insert_bs(file, file_bs, &local_err); |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4086 | bdrv_unref(file_bs); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4087 | |
Kevin Wolf | d708642 | 2017-01-13 19:02:32 +0100 | [diff] [blame] | 4088 | if (local_err) { |
| 4089 | goto fail; |
| 4090 | } |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4091 | |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 4092 | qdict_put_str(options, "file", bdrv_get_node_name(file_bs)); |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 4093 | } |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 4094 | } |
| 4095 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4096 | /* Image format probing */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 4097 | bs->probed = !drv; |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4098 | if (!drv && file) { |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 4099 | ret = find_image_format(file, filename, &drv, &local_err); |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 4100 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 4101 | goto fail; |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 4102 | } |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 4103 | /* |
| 4104 | * This option update would logically belong in bdrv_fill_options(), |
| 4105 | * but we first need to open bs->file for the probing to work, while |
| 4106 | * opening bs->file already requires the (mostly) final set of options |
| 4107 | * so that cache mode etc. can be inherited. |
| 4108 | * |
| 4109 | * Adding the driver later is somewhat ugly, but it's not an option |
| 4110 | * that would ever be inherited, so it's correct. We just need to make |
| 4111 | * sure to update both bs->options (which has the full effective |
| 4112 | * options for bs) and options (which has file.* already removed). |
| 4113 | */ |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 4114 | qdict_put_str(bs->options, "driver", drv->format_name); |
| 4115 | qdict_put_str(options, "driver", drv->format_name); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4116 | } else if (!drv) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 4117 | error_setg(errp, "Must specify either driver or file"); |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 4118 | goto fail; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 4119 | } |
| 4120 | |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 4121 | /* BDRV_O_PROTOCOL must be set iff a protocol BDS is about to be created */ |
| 4122 | assert(!!(flags & BDRV_O_PROTOCOL) == !!drv->bdrv_file_open); |
| 4123 | /* file must be NULL if a protocol BDS is about to be created |
| 4124 | * (the inverse results in an error message from bdrv_open_common()) */ |
| 4125 | assert(!(flags & BDRV_O_PROTOCOL) || !file); |
| 4126 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4127 | /* Open the image */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 4128 | ret = bdrv_open_common(bs, file, options, &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4129 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 4130 | goto fail; |
Christoph Hellwig | 6987307 | 2010-01-20 18:13:25 +0100 | [diff] [blame] | 4131 | } |
| 4132 | |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 4133 | if (file) { |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4134 | blk_unref(file); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 4135 | file = NULL; |
| 4136 | } |
| 4137 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4138 | /* If there is a backing file, use it */ |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 4139 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 4140 | ret = bdrv_open_backing_file(bs, options, "backing", &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4141 | if (ret < 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4142 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4143 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4144 | } |
| 4145 | |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 4146 | /* Remove all children options and references |
| 4147 | * from bs->options and bs->explicit_options */ |
Alberto Garcia | 2f624b8 | 2018-06-29 14:37:00 +0300 | [diff] [blame] | 4148 | QLIST_FOREACH(child, &bs->children, next) { |
| 4149 | char *child_key_dot; |
| 4150 | child_key_dot = g_strdup_printf("%s.", child->name); |
| 4151 | qdict_extract_subqdict(bs->explicit_options, NULL, child_key_dot); |
| 4152 | qdict_extract_subqdict(bs->options, NULL, child_key_dot); |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 4153 | qdict_del(bs->explicit_options, child->name); |
| 4154 | qdict_del(bs->options, child->name); |
Alberto Garcia | 2f624b8 | 2018-06-29 14:37:00 +0300 | [diff] [blame] | 4155 | g_free(child_key_dot); |
| 4156 | } |
| 4157 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4158 | /* Check if any unknown options were used */ |
Paolo Bonzini | 7ad2757 | 2017-01-04 15:59:14 +0100 | [diff] [blame] | 4159 | if (qdict_size(options) != 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4160 | const QDictEntry *entry = qdict_first(options); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 4161 | if (flags & BDRV_O_PROTOCOL) { |
| 4162 | error_setg(errp, "Block protocol '%s' doesn't support the option " |
| 4163 | "'%s'", drv->format_name, entry->key); |
| 4164 | } else { |
Max Reitz | d0e46a5 | 2016-03-16 19:54:34 +0100 | [diff] [blame] | 4165 | error_setg(errp, |
| 4166 | "Block format '%s' does not support the option '%s'", |
| 4167 | drv->format_name, entry->key); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 4168 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4169 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4170 | goto close_and_fail; |
| 4171 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4172 | |
Daniel P. Berrange | c01c214 | 2017-06-23 17:24:16 +0100 | [diff] [blame] | 4173 | bdrv_parent_cb_change_media(bs, true); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4174 | |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 4175 | qobject_unref(options); |
Alberto Garcia | 8961be3 | 2018-09-06 17:25:41 +0300 | [diff] [blame] | 4176 | options = NULL; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 4177 | |
| 4178 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
| 4179 | * temporary snapshot afterwards. */ |
| 4180 | if (snapshot_flags) { |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 4181 | BlockDriverState *snapshot_bs; |
| 4182 | snapshot_bs = bdrv_append_temp_snapshot(bs, snapshot_flags, |
| 4183 | snapshot_options, &local_err); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 4184 | snapshot_options = NULL; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 4185 | if (local_err) { |
| 4186 | goto close_and_fail; |
| 4187 | } |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4188 | /* We are not going to return bs but the overlay on top of it |
| 4189 | * (snapshot_bs); thus, we have to drop the strong reference to bs |
| 4190 | * (which we obtained by calling bdrv_new()). bs will not be deleted, |
| 4191 | * though, because the overlay still has a reference to it. */ |
| 4192 | bdrv_unref(bs); |
| 4193 | bs = snapshot_bs; |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 4194 | } |
| 4195 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4196 | return bs; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4197 | |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 4198 | fail: |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4199 | blk_unref(file); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 4200 | qobject_unref(snapshot_options); |
| 4201 | qobject_unref(bs->explicit_options); |
| 4202 | qobject_unref(bs->options); |
| 4203 | qobject_unref(options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 4204 | bs->options = NULL; |
Manos Pitsidianakis | 998cbd6 | 2017-07-14 17:35:47 +0300 | [diff] [blame] | 4205 | bs->explicit_options = NULL; |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4206 | bdrv_unref(bs); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 4207 | error_propagate(errp, local_err); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4208 | return NULL; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 4209 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4210 | close_and_fail: |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4211 | bdrv_unref(bs); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 4212 | qobject_unref(snapshot_options); |
| 4213 | qobject_unref(options); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 4214 | error_propagate(errp, local_err); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4215 | return NULL; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4216 | } |
| 4217 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4218 | BlockDriverState *bdrv_open(const char *filename, const char *reference, |
| 4219 | QDict *options, int flags, Error **errp) |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 4220 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4221 | GLOBAL_STATE_CODE(); |
| 4222 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4223 | return bdrv_open_inherit(filename, reference, options, flags, NULL, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 4224 | NULL, 0, errp); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 4225 | } |
| 4226 | |
Alberto Garcia | faf116b | 2019-03-12 18:48:49 +0200 | [diff] [blame] | 4227 | /* Return true if the NULL-terminated @list contains @str */ |
| 4228 | static bool is_str_in_list(const char *str, const char *const *list) |
| 4229 | { |
| 4230 | if (str && list) { |
| 4231 | int i; |
| 4232 | for (i = 0; list[i] != NULL; i++) { |
| 4233 | if (!strcmp(str, list[i])) { |
| 4234 | return true; |
| 4235 | } |
| 4236 | } |
| 4237 | } |
| 4238 | return false; |
| 4239 | } |
| 4240 | |
| 4241 | /* |
| 4242 | * Check that every option set in @bs->options is also set in |
| 4243 | * @new_opts. |
| 4244 | * |
| 4245 | * Options listed in the common_options list and in |
| 4246 | * @bs->drv->mutable_opts are skipped. |
| 4247 | * |
| 4248 | * Return 0 on success, otherwise return -EINVAL and set @errp. |
| 4249 | */ |
| 4250 | static int bdrv_reset_options_allowed(BlockDriverState *bs, |
| 4251 | const QDict *new_opts, Error **errp) |
| 4252 | { |
| 4253 | const QDictEntry *e; |
| 4254 | /* These options are common to all block drivers and are handled |
| 4255 | * in bdrv_reopen_prepare() so they can be left out of @new_opts */ |
| 4256 | const char *const common_options[] = { |
| 4257 | "node-name", "discard", "cache.direct", "cache.no-flush", |
| 4258 | "read-only", "auto-read-only", "detect-zeroes", NULL |
| 4259 | }; |
| 4260 | |
| 4261 | for (e = qdict_first(bs->options); e; e = qdict_next(bs->options, e)) { |
| 4262 | if (!qdict_haskey(new_opts, e->key) && |
| 4263 | !is_str_in_list(e->key, common_options) && |
| 4264 | !is_str_in_list(e->key, bs->drv->mutable_opts)) { |
| 4265 | error_setg(errp, "Option '%s' cannot be reset " |
| 4266 | "to its default value", e->key); |
| 4267 | return -EINVAL; |
| 4268 | } |
| 4269 | } |
| 4270 | |
| 4271 | return 0; |
| 4272 | } |
| 4273 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4274 | /* |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4275 | * Returns true if @child can be reached recursively from @bs |
| 4276 | */ |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4277 | static bool GRAPH_RDLOCK |
| 4278 | bdrv_recurse_has_child(BlockDriverState *bs, BlockDriverState *child) |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4279 | { |
| 4280 | BdrvChild *c; |
| 4281 | |
| 4282 | if (bs == child) { |
| 4283 | return true; |
| 4284 | } |
| 4285 | |
| 4286 | QLIST_FOREACH(c, &bs->children, next) { |
| 4287 | if (bdrv_recurse_has_child(c->bs, child)) { |
| 4288 | return true; |
| 4289 | } |
| 4290 | } |
| 4291 | |
| 4292 | return false; |
| 4293 | } |
| 4294 | |
| 4295 | /* |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4296 | * Adds a BlockDriverState to a simple queue for an atomic, transactional |
| 4297 | * reopen of multiple devices. |
| 4298 | * |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4299 | * 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] | 4300 | * already performed, or alternatively may be NULL a new BlockReopenQueue will |
| 4301 | * be created and initialized. This newly created BlockReopenQueue should be |
| 4302 | * passed back in for subsequent calls that are intended to be of the same |
| 4303 | * atomic 'set'. |
| 4304 | * |
| 4305 | * bs is the BlockDriverState to add to the reopen queue. |
| 4306 | * |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4307 | * options contains the changed options for the associated bs |
| 4308 | * (the BlockReopenQueue takes ownership) |
| 4309 | * |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4310 | * flags contains the open flags for the associated bs |
| 4311 | * |
| 4312 | * returns a pointer to bs_queue, which is either the newly allocated |
| 4313 | * bs_queue, or the existing bs_queue being used. |
| 4314 | * |
Kevin Wolf | d22933a | 2022-11-18 18:41:02 +0100 | [diff] [blame] | 4315 | * bs is drained here and undrained by bdrv_reopen_queue_free(). |
Kevin Wolf | 2e11786 | 2022-11-18 18:41:01 +0100 | [diff] [blame] | 4316 | * |
| 4317 | * To be called with bs->aio_context locked. |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4318 | */ |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4319 | static BlockReopenQueue * GRAPH_RDLOCK |
| 4320 | bdrv_reopen_queue_child(BlockReopenQueue *bs_queue, BlockDriverState *bs, |
| 4321 | QDict *options, const BdrvChildClass *klass, |
| 4322 | BdrvChildRole role, bool parent_is_format, |
| 4323 | QDict *parent_options, int parent_flags, |
| 4324 | bool keep_old_opts) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4325 | { |
| 4326 | assert(bs != NULL); |
| 4327 | |
| 4328 | BlockReopenQueueEntry *bs_entry; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4329 | BdrvChild *child; |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4330 | QDict *old_options, *explicit_options, *options_copy; |
| 4331 | int flags; |
| 4332 | QemuOpts *opts; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4333 | |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 4334 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 4335 | |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4336 | /* |
| 4337 | * Strictly speaking, draining is illegal under GRAPH_RDLOCK. We know that |
| 4338 | * we've been called with bdrv_graph_rdlock_main_loop(), though, so it's ok |
| 4339 | * in practice. |
| 4340 | */ |
Kevin Wolf | d22933a | 2022-11-18 18:41:02 +0100 | [diff] [blame] | 4341 | bdrv_drained_begin(bs); |
| 4342 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4343 | if (bs_queue == NULL) { |
| 4344 | bs_queue = g_new0(BlockReopenQueue, 1); |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4345 | QTAILQ_INIT(bs_queue); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4346 | } |
| 4347 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4348 | if (!options) { |
| 4349 | options = qdict_new(); |
| 4350 | } |
| 4351 | |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 4352 | /* Check if this BlockDriverState is already in the queue */ |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4353 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 4354 | if (bs == bs_entry->state.bs) { |
| 4355 | break; |
| 4356 | } |
| 4357 | } |
| 4358 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4359 | /* |
| 4360 | * Precedence of options: |
| 4361 | * 1. Explicitly passed in options (highest) |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4362 | * 2. Retained from explicitly set options of bs |
| 4363 | * 3. Inherited from parent node |
| 4364 | * 4. Retained from effective options of bs |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4365 | */ |
| 4366 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 4367 | /* Old explicitly set values (don't overwrite by inherited value) */ |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 4368 | if (bs_entry || keep_old_opts) { |
| 4369 | old_options = qdict_clone_shallow(bs_entry ? |
| 4370 | bs_entry->state.explicit_options : |
| 4371 | bs->explicit_options); |
| 4372 | bdrv_join_options(bs, options, old_options); |
| 4373 | qobject_unref(old_options); |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 4374 | } |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 4375 | |
| 4376 | explicit_options = qdict_clone_shallow(options); |
| 4377 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4378 | /* Inherit from parent node */ |
| 4379 | if (parent_options) { |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4380 | flags = 0; |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4381 | klass->inherit_options(role, parent_is_format, &flags, options, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 4382 | parent_flags, parent_options); |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4383 | } else { |
| 4384 | flags = bdrv_get_flags(bs); |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4385 | } |
| 4386 | |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 4387 | if (keep_old_opts) { |
| 4388 | /* Old values are used for options that aren't set yet */ |
| 4389 | old_options = qdict_clone_shallow(bs->options); |
| 4390 | bdrv_join_options(bs, options, old_options); |
| 4391 | qobject_unref(old_options); |
| 4392 | } |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4393 | |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4394 | /* We have the final set of options so let's update the flags */ |
| 4395 | options_copy = qdict_clone_shallow(options); |
| 4396 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
| 4397 | qemu_opts_absorb_qdict(opts, options_copy, NULL); |
| 4398 | update_flags_from_options(&flags, opts); |
| 4399 | qemu_opts_del(opts); |
| 4400 | qobject_unref(options_copy); |
| 4401 | |
Kevin Wolf | fd45202 | 2017-08-03 17:02:59 +0200 | [diff] [blame] | 4402 | /* bdrv_open_inherit() sets and clears some additional flags internally */ |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 4403 | flags &= ~BDRV_O_PROTOCOL; |
Kevin Wolf | fd45202 | 2017-08-03 17:02:59 +0200 | [diff] [blame] | 4404 | if (flags & BDRV_O_RDWR) { |
| 4405 | flags |= BDRV_O_ALLOW_RDWR; |
| 4406 | } |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 4407 | |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 4408 | if (!bs_entry) { |
| 4409 | bs_entry = g_new0(BlockReopenQueueEntry, 1); |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4410 | QTAILQ_INSERT_TAIL(bs_queue, bs_entry, entry); |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 4411 | } else { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 4412 | qobject_unref(bs_entry->state.options); |
| 4413 | qobject_unref(bs_entry->state.explicit_options); |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 4414 | } |
| 4415 | |
| 4416 | bs_entry->state.bs = bs; |
| 4417 | bs_entry->state.options = options; |
| 4418 | bs_entry->state.explicit_options = explicit_options; |
| 4419 | bs_entry->state.flags = flags; |
| 4420 | |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4421 | /* |
| 4422 | * If keep_old_opts is false then it means that unspecified |
| 4423 | * options must be reset to their original value. We don't allow |
| 4424 | * resetting 'backing' but we need to know if the option is |
| 4425 | * missing in order to decide if we have to return an error. |
| 4426 | */ |
| 4427 | if (!keep_old_opts) { |
| 4428 | bs_entry->state.backing_missing = |
| 4429 | !qdict_haskey(options, "backing") && |
| 4430 | !qdict_haskey(options, "backing.driver"); |
| 4431 | } |
| 4432 | |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4433 | QLIST_FOREACH(child, &bs->children, next) { |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4434 | QDict *new_child_options = NULL; |
| 4435 | bool child_keep_old = keep_old_opts; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4436 | |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 4437 | /* reopen can only change the options of block devices that were |
| 4438 | * implicitly created and inherited options. For other (referenced) |
| 4439 | * block devices, a syntax like "backing.foo" results in an error. */ |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4440 | if (child->bs->inherits_from != bs) { |
| 4441 | continue; |
| 4442 | } |
| 4443 | |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4444 | /* Check if the options contain a child reference */ |
| 4445 | if (qdict_haskey(options, child->name)) { |
| 4446 | const char *childref = qdict_get_try_str(options, child->name); |
| 4447 | /* |
| 4448 | * The current child must not be reopened if the child |
| 4449 | * reference is null or points to a different node. |
| 4450 | */ |
| 4451 | if (g_strcmp0(childref, child->bs->node_name)) { |
| 4452 | continue; |
| 4453 | } |
| 4454 | /* |
| 4455 | * If the child reference points to the current child then |
| 4456 | * reopen it with its existing set of options (note that |
| 4457 | * it can still inherit new options from the parent). |
| 4458 | */ |
| 4459 | child_keep_old = true; |
| 4460 | } else { |
| 4461 | /* Extract child options ("child-name.*") */ |
| 4462 | char *child_key_dot = g_strdup_printf("%s.", child->name); |
| 4463 | qdict_extract_subqdict(explicit_options, NULL, child_key_dot); |
| 4464 | qdict_extract_subqdict(options, &new_child_options, child_key_dot); |
| 4465 | g_free(child_key_dot); |
| 4466 | } |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 4467 | |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4468 | bdrv_reopen_queue_child(bs_queue, child->bs, new_child_options, |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4469 | child->klass, child->role, bs->drv->is_format, |
| 4470 | options, flags, child_keep_old); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4471 | } |
| 4472 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4473 | return bs_queue; |
| 4474 | } |
| 4475 | |
Kevin Wolf | 2e11786 | 2022-11-18 18:41:01 +0100 | [diff] [blame] | 4476 | /* To be called with bs->aio_context locked */ |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4477 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
| 4478 | BlockDriverState *bs, |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 4479 | QDict *options, bool keep_old_opts) |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4480 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4481 | GLOBAL_STATE_CODE(); |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4482 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4483 | |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4484 | return bdrv_reopen_queue_child(bs_queue, bs, options, NULL, 0, false, |
| 4485 | NULL, 0, keep_old_opts); |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4486 | } |
| 4487 | |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 4488 | void bdrv_reopen_queue_free(BlockReopenQueue *bs_queue) |
| 4489 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4490 | GLOBAL_STATE_CODE(); |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 4491 | if (bs_queue) { |
| 4492 | BlockReopenQueueEntry *bs_entry, *next; |
| 4493 | QTAILQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
Kevin Wolf | d22933a | 2022-11-18 18:41:02 +0100 | [diff] [blame] | 4494 | bdrv_drained_end(bs_entry->state.bs); |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 4495 | qobject_unref(bs_entry->state.explicit_options); |
| 4496 | qobject_unref(bs_entry->state.options); |
| 4497 | g_free(bs_entry); |
| 4498 | } |
| 4499 | g_free(bs_queue); |
| 4500 | } |
| 4501 | } |
| 4502 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4503 | /* |
| 4504 | * Reopen multiple BlockDriverStates atomically & transactionally. |
| 4505 | * |
| 4506 | * The queue passed in (bs_queue) must have been built up previous |
| 4507 | * via bdrv_reopen_queue(). |
| 4508 | * |
| 4509 | * Reopens all BDS specified in the queue, with the appropriate |
| 4510 | * flags. All devices are prepared for reopen, and failure of any |
Stefan Weil | 50d6a8a | 2018-07-12 21:51:20 +0200 | [diff] [blame] | 4511 | * device will cause all device changes to be abandoned, and intermediate |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4512 | * data cleaned up. |
| 4513 | * |
| 4514 | * If all devices prepare successfully, then the changes are committed |
| 4515 | * to all devices. |
| 4516 | * |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 4517 | * All affected nodes must be drained between bdrv_reopen_queue() and |
| 4518 | * bdrv_reopen_multiple(). |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4519 | * |
| 4520 | * To be called from the main thread, with all other AioContexts unlocked. |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4521 | */ |
Alberto Garcia | 5019aec | 2019-03-12 18:48:50 +0200 | [diff] [blame] | 4522 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4523 | { |
| 4524 | int ret = -1; |
| 4525 | BlockReopenQueueEntry *bs_entry, *next; |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4526 | Transaction *tran = tran_new(); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4527 | g_autoptr(GSList) refresh_list = NULL; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4528 | |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4529 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4530 | assert(bs_queue != NULL); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 4531 | GLOBAL_STATE_CODE(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4532 | |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4533 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
Vladimir Sementsov-Ogievskiy | a2aabf8 | 2021-04-28 18:17:57 +0300 | [diff] [blame] | 4534 | ret = bdrv_flush(bs_entry->state.bs); |
| 4535 | if (ret < 0) { |
| 4536 | error_setg_errno(errp, -ret, "Error flushing drive"); |
Kevin Wolf | e3fc91a | 2021-05-03 13:05:55 +0200 | [diff] [blame] | 4537 | goto abort; |
Vladimir Sementsov-Ogievskiy | a2aabf8 | 2021-04-28 18:17:57 +0300 | [diff] [blame] | 4538 | } |
| 4539 | } |
| 4540 | |
| 4541 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 4542 | assert(bs_entry->state.bs->quiesce_counter > 0); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4543 | ret = bdrv_reopen_prepare(&bs_entry->state, bs_queue, tran, errp); |
| 4544 | if (ret < 0) { |
| 4545 | goto abort; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4546 | } |
| 4547 | bs_entry->prepared = true; |
| 4548 | } |
| 4549 | |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4550 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4551 | BDRVReopenState *state = &bs_entry->state; |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4552 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 4553 | refresh_list = g_slist_prepend(refresh_list, state->bs); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4554 | if (state->old_backing_bs) { |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 4555 | refresh_list = g_slist_prepend(refresh_list, state->old_backing_bs); |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4556 | } |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4557 | if (state->old_file_bs) { |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 4558 | refresh_list = g_slist_prepend(refresh_list, state->old_file_bs); |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4559 | } |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4560 | } |
| 4561 | |
| 4562 | /* |
| 4563 | * Note that file-posix driver rely on permission update done during reopen |
| 4564 | * (even if no permission changed), because it wants "new" permissions for |
| 4565 | * reconfiguring the fd and that's why it does it in raw_check_perm(), not |
| 4566 | * in raw_reopen_prepare() which is called with "old" permissions. |
| 4567 | */ |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 4568 | bdrv_graph_rdlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4569 | ret = bdrv_list_refresh_perms(refresh_list, bs_queue, tran, errp); |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 4570 | bdrv_graph_rdunlock_main_loop(); |
| 4571 | |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4572 | if (ret < 0) { |
| 4573 | goto abort; |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4574 | } |
| 4575 | |
Vladimir Sementsov-Ogievskiy | fcd6a4f | 2019-09-27 15:23:48 +0300 | [diff] [blame] | 4576 | /* |
| 4577 | * If we reach this point, we have success and just need to apply the |
| 4578 | * changes. |
| 4579 | * |
| 4580 | * Reverse order is used to comfort qcow2 driver: on commit it need to write |
| 4581 | * IN_USE flag to the image, to mark bitmaps in the image as invalid. But |
| 4582 | * children are usually goes after parents in reopen-queue, so go from last |
| 4583 | * to first element. |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4584 | */ |
Vladimir Sementsov-Ogievskiy | fcd6a4f | 2019-09-27 15:23:48 +0300 | [diff] [blame] | 4585 | QTAILQ_FOREACH_REVERSE(bs_entry, bs_queue, entry) { |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4586 | bdrv_reopen_commit(&bs_entry->state); |
| 4587 | } |
| 4588 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 4589 | bdrv_graph_wrlock(); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4590 | tran_commit(tran); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 4591 | bdrv_graph_wrunlock(); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4592 | |
| 4593 | QTAILQ_FOREACH_REVERSE(bs_entry, bs_queue, entry) { |
| 4594 | BlockDriverState *bs = bs_entry->state.bs; |
| 4595 | |
| 4596 | if (bs->drv->bdrv_reopen_commit_post) { |
| 4597 | bs->drv->bdrv_reopen_commit_post(&bs_entry->state); |
| 4598 | } |
| 4599 | } |
| 4600 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4601 | ret = 0; |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4602 | goto cleanup; |
| 4603 | |
| 4604 | abort: |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 4605 | bdrv_graph_wrlock(); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4606 | tran_abort(tran); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 4607 | bdrv_graph_wrunlock(); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 4608 | |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4609 | QTAILQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4610 | if (bs_entry->prepared) { |
| 4611 | bdrv_reopen_abort(&bs_entry->state); |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4612 | } |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4613 | } |
Peter Krempa | 17e1e2b | 2020-02-28 13:44:46 +0100 | [diff] [blame] | 4614 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4615 | cleanup: |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 4616 | bdrv_reopen_queue_free(bs_queue); |
Alberto Garcia | 40840e4 | 2016-10-28 10:08:03 +0300 | [diff] [blame] | 4617 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4618 | return ret; |
| 4619 | } |
| 4620 | |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4621 | int bdrv_reopen(BlockDriverState *bs, QDict *opts, bool keep_old_opts, |
| 4622 | Error **errp) |
| 4623 | { |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4624 | BlockReopenQueue *queue; |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4625 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4626 | GLOBAL_STATE_CODE(); |
| 4627 | |
Kevin Wolf | 2e11786 | 2022-11-18 18:41:01 +0100 | [diff] [blame] | 4628 | queue = bdrv_reopen_queue(NULL, bs, opts, keep_old_opts); |
| 4629 | |
Stefan Hajnoczi | b49f475 | 2023-12-05 13:20:03 -0500 | [diff] [blame] | 4630 | return bdrv_reopen_multiple(queue, errp); |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4631 | } |
| 4632 | |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 4633 | int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only, |
| 4634 | Error **errp) |
| 4635 | { |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 4636 | QDict *opts = qdict_new(); |
| 4637 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4638 | GLOBAL_STATE_CODE(); |
| 4639 | |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 4640 | qdict_put_bool(opts, BDRV_OPT_READ_ONLY, read_only); |
| 4641 | |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4642 | return bdrv_reopen(bs, opts, true, errp); |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 4643 | } |
| 4644 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4645 | /* |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4646 | * Take a BDRVReopenState and check if the value of 'backing' in the |
| 4647 | * reopen_state->options QDict is valid or not. |
| 4648 | * |
| 4649 | * If 'backing' is missing from the QDict then return 0. |
| 4650 | * |
| 4651 | * If 'backing' contains the node name of the backing file of |
| 4652 | * reopen_state->bs then return 0. |
| 4653 | * |
| 4654 | * If 'backing' contains a different node name (or is null) then check |
| 4655 | * whether the current backing file can be replaced with the new one. |
| 4656 | * If that's the case then reopen_state->replace_backing_bs is set to |
| 4657 | * true and reopen_state->new_backing_bs contains a pointer to the new |
| 4658 | * backing BlockDriverState (or NULL). |
| 4659 | * |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 4660 | * After calling this function, the transaction @tran may only be completed |
| 4661 | * while holding a writer lock for the graph. |
| 4662 | * |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4663 | * Return 0 on success, otherwise return < 0 and set @errp. |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4664 | * |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4665 | * @reopen_state->bs can move to a different AioContext in this function. |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4666 | */ |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4667 | static int GRAPH_UNLOCKED |
| 4668 | bdrv_reopen_parse_file_or_backing(BDRVReopenState *reopen_state, |
| 4669 | bool is_backing, Transaction *tran, |
| 4670 | Error **errp) |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4671 | { |
| 4672 | BlockDriverState *bs = reopen_state->bs; |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4673 | BlockDriverState *new_child_bs; |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 4674 | BlockDriverState *old_child_bs; |
| 4675 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4676 | const char *child_name = is_backing ? "backing" : "file"; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4677 | QObject *value; |
| 4678 | const char *str; |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4679 | bool has_child; |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4680 | int ret; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4681 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 4682 | GLOBAL_STATE_CODE(); |
| 4683 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4684 | value = qdict_get(reopen_state->options, child_name); |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4685 | if (value == NULL) { |
| 4686 | return 0; |
| 4687 | } |
| 4688 | |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4689 | bdrv_graph_rdlock_main_loop(); |
| 4690 | |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4691 | switch (qobject_type(value)) { |
| 4692 | case QTYPE_QNULL: |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4693 | assert(is_backing); /* The 'file' option does not allow a null value */ |
| 4694 | new_child_bs = NULL; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4695 | break; |
| 4696 | case QTYPE_QSTRING: |
Markus Armbruster | 410f44f | 2020-12-11 18:11:42 +0100 | [diff] [blame] | 4697 | str = qstring_get_str(qobject_to(QString, value)); |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4698 | new_child_bs = bdrv_lookup_bs(NULL, str, errp); |
| 4699 | if (new_child_bs == NULL) { |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4700 | ret = -EINVAL; |
| 4701 | goto out_rdlock; |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4702 | } |
| 4703 | |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4704 | has_child = bdrv_recurse_has_child(new_child_bs, bs); |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4705 | if (has_child) { |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4706 | error_setg(errp, "Making '%s' a %s child of '%s' would create a " |
| 4707 | "cycle", str, child_name, bs->node_name); |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4708 | ret = -EINVAL; |
| 4709 | goto out_rdlock; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4710 | } |
| 4711 | break; |
| 4712 | default: |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4713 | /* |
| 4714 | * The options QDict has been flattened, so 'backing' and 'file' |
| 4715 | * do not allow any other data type here. |
| 4716 | */ |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4717 | g_assert_not_reached(); |
| 4718 | } |
| 4719 | |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 4720 | 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] | 4721 | if (old_child_bs == new_child_bs) { |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4722 | ret = 0; |
| 4723 | goto out_rdlock; |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4724 | } |
| 4725 | |
| 4726 | if (old_child_bs) { |
| 4727 | if (bdrv_skip_implicit_filters(old_child_bs) == new_child_bs) { |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4728 | ret = 0; |
| 4729 | goto out_rdlock; |
Vladimir Sementsov-Ogievskiy | cbfdb98 | 2021-06-10 15:05:33 +0300 | [diff] [blame] | 4730 | } |
| 4731 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4732 | if (old_child_bs->implicit) { |
| 4733 | error_setg(errp, "Cannot replace implicit %s child of %s", |
| 4734 | child_name, bs->node_name); |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4735 | ret = -EPERM; |
| 4736 | goto out_rdlock; |
Vladimir Sementsov-Ogievskiy | cbfdb98 | 2021-06-10 15:05:33 +0300 | [diff] [blame] | 4737 | } |
| 4738 | } |
| 4739 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4740 | if (bs->drv->is_filter && !old_child_bs) { |
Vladimir Sementsov-Ogievskiy | 25f78d9 | 2021-06-10 15:05:34 +0300 | [diff] [blame] | 4741 | /* |
| 4742 | * Filters always have a file or a backing child, so we are trying to |
| 4743 | * change wrong child |
| 4744 | */ |
| 4745 | 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] | 4746 | "%s child", bs->node_name, bs->drv->format_name, child_name); |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4747 | ret = -EINVAL; |
| 4748 | goto out_rdlock; |
Max Reitz | 1d42f48 | 2019-06-12 17:24:39 +0200 | [diff] [blame] | 4749 | } |
| 4750 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4751 | if (is_backing) { |
| 4752 | reopen_state->old_backing_bs = old_child_bs; |
| 4753 | } else { |
| 4754 | reopen_state->old_file_bs = old_child_bs; |
| 4755 | } |
| 4756 | |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 4757 | if (old_child_bs) { |
| 4758 | bdrv_ref(old_child_bs); |
| 4759 | bdrv_drained_begin(old_child_bs); |
| 4760 | } |
| 4761 | |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4762 | bdrv_graph_rdunlock_main_loop(); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 4763 | bdrv_graph_wrlock(); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 4764 | |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4765 | ret = bdrv_set_file_or_backing_noperm(bs, new_child_bs, is_backing, |
| 4766 | tran, errp); |
| 4767 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 4768 | bdrv_graph_wrunlock(); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 4769 | |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 4770 | if (old_child_bs) { |
| 4771 | bdrv_drained_end(old_child_bs); |
| 4772 | bdrv_unref(old_child_bs); |
| 4773 | } |
| 4774 | |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4775 | return ret; |
Kevin Wolf | 430da83 | 2023-10-27 17:53:16 +0200 | [diff] [blame] | 4776 | |
| 4777 | out_rdlock: |
| 4778 | bdrv_graph_rdunlock_main_loop(); |
| 4779 | return ret; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4780 | } |
| 4781 | |
| 4782 | /* |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4783 | * Prepares a BlockDriverState for reopen. All changes are staged in the |
| 4784 | * 'opaque' field of the BDRVReopenState, which is used and allocated by |
| 4785 | * the block driver layer .bdrv_reopen_prepare() |
| 4786 | * |
| 4787 | * bs is the BlockDriverState to reopen |
| 4788 | * flags are the new open flags |
| 4789 | * queue is the reopen queue |
| 4790 | * |
| 4791 | * Returns 0 on success, non-zero on error. On error errp will be set |
| 4792 | * as well. |
| 4793 | * |
| 4794 | * On failure, bdrv_reopen_abort() will be called to clean up any data. |
| 4795 | * It is the responsibility of the caller to then call the abort() or |
| 4796 | * commit() for any other BDS that have been left in a prepare() state |
| 4797 | * |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 4798 | * After calling this function, the transaction @change_child_tran may only be |
| 4799 | * completed while holding a writer lock for the graph. |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4800 | */ |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4801 | static int GRAPH_UNLOCKED |
| 4802 | bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, |
| 4803 | Transaction *change_child_tran, Error **errp) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4804 | { |
| 4805 | int ret = -1; |
Alberto Garcia | e6d79c4 | 2018-11-12 16:00:47 +0200 | [diff] [blame] | 4806 | int old_flags; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4807 | Error *local_err = NULL; |
| 4808 | BlockDriver *drv; |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4809 | QemuOpts *opts; |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 4810 | QDict *orig_reopen_opts; |
Alberto Garcia | 593b307 | 2018-09-06 12:37:08 +0300 | [diff] [blame] | 4811 | char *discard = NULL; |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 4812 | bool read_only; |
Max Reitz | 9ad08c4 | 2018-11-16 17:45:24 +0100 | [diff] [blame] | 4813 | bool drv_prepared = false; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4814 | |
| 4815 | assert(reopen_state != NULL); |
| 4816 | assert(reopen_state->bs->drv != NULL); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 4817 | GLOBAL_STATE_CODE(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4818 | drv = reopen_state->bs->drv; |
| 4819 | |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 4820 | /* This function and each driver's bdrv_reopen_prepare() remove |
| 4821 | * entries from reopen_state->options as they are processed, so |
| 4822 | * we need to make a copy of the original QDict. */ |
| 4823 | orig_reopen_opts = qdict_clone_shallow(reopen_state->options); |
| 4824 | |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4825 | /* Process generic block layer options */ |
| 4826 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
Markus Armbruster | af175e8 | 2020-07-07 18:06:03 +0200 | [diff] [blame] | 4827 | if (!qemu_opts_absorb_qdict(opts, reopen_state->options, errp)) { |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4828 | ret = -EINVAL; |
| 4829 | goto error; |
| 4830 | } |
| 4831 | |
Alberto Garcia | e6d79c4 | 2018-11-12 16:00:47 +0200 | [diff] [blame] | 4832 | /* This was already called in bdrv_reopen_queue_child() so the flags |
| 4833 | * are up-to-date. This time we simply want to remove the options from |
| 4834 | * QemuOpts in order to indicate that they have been processed. */ |
| 4835 | old_flags = reopen_state->flags; |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 4836 | update_flags_from_options(&reopen_state->flags, opts); |
Alberto Garcia | e6d79c4 | 2018-11-12 16:00:47 +0200 | [diff] [blame] | 4837 | assert(old_flags == reopen_state->flags); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 4838 | |
Alberto Garcia | 415bbca | 2018-10-03 13:23:13 +0300 | [diff] [blame] | 4839 | discard = qemu_opt_get_del(opts, BDRV_OPT_DISCARD); |
Alberto Garcia | 593b307 | 2018-09-06 12:37:08 +0300 | [diff] [blame] | 4840 | if (discard != NULL) { |
| 4841 | if (bdrv_parse_discard_flags(discard, &reopen_state->flags) != 0) { |
| 4842 | error_setg(errp, "Invalid discard option"); |
| 4843 | ret = -EINVAL; |
| 4844 | goto error; |
| 4845 | } |
| 4846 | } |
| 4847 | |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 4848 | reopen_state->detect_zeroes = |
| 4849 | bdrv_parse_detect_zeroes(opts, reopen_state->flags, &local_err); |
| 4850 | if (local_err) { |
| 4851 | error_propagate(errp, local_err); |
| 4852 | ret = -EINVAL; |
| 4853 | goto error; |
| 4854 | } |
| 4855 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 4856 | /* All other options (including node-name and driver) must be unchanged. |
| 4857 | * Put them back into the QDict, so that they are checked at the end |
| 4858 | * of this function. */ |
| 4859 | qemu_opts_to_qdict(opts, reopen_state->options); |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4860 | |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 4861 | /* If we are to stay read-only, do not allow permission change |
| 4862 | * to r/w. Attempting to set to r/w may fail if either BDRV_O_ALLOW_RDWR is |
| 4863 | * not set, or if the BDS still has copy_on_read enabled */ |
| 4864 | read_only = !(reopen_state->flags & BDRV_O_RDWR); |
Kevin Wolf | 4026f1c | 2023-09-29 16:51:47 +0200 | [diff] [blame] | 4865 | |
| 4866 | bdrv_graph_rdlock_main_loop(); |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 4867 | 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] | 4868 | bdrv_graph_rdunlock_main_loop(); |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 4869 | if (local_err) { |
| 4870 | error_propagate(errp, local_err); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4871 | goto error; |
| 4872 | } |
| 4873 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4874 | if (drv->bdrv_reopen_prepare) { |
Alberto Garcia | faf116b | 2019-03-12 18:48:49 +0200 | [diff] [blame] | 4875 | /* |
| 4876 | * If a driver-specific option is missing, it means that we |
| 4877 | * should reset it to its default value. |
| 4878 | * But not all options allow that, so we need to check it first. |
| 4879 | */ |
| 4880 | ret = bdrv_reset_options_allowed(reopen_state->bs, |
| 4881 | reopen_state->options, errp); |
| 4882 | if (ret) { |
| 4883 | goto error; |
| 4884 | } |
| 4885 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4886 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); |
| 4887 | if (ret) { |
| 4888 | if (local_err != NULL) { |
| 4889 | error_propagate(errp, local_err); |
| 4890 | } else { |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 4891 | bdrv_graph_rdlock_main_loop(); |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 4892 | bdrv_refresh_filename(reopen_state->bs); |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 4893 | bdrv_graph_rdunlock_main_loop(); |
Luiz Capitulino | d8b6895 | 2013-06-10 11:29:27 -0400 | [diff] [blame] | 4894 | error_setg(errp, "failed while preparing to reopen image '%s'", |
| 4895 | reopen_state->bs->filename); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4896 | } |
| 4897 | goto error; |
| 4898 | } |
| 4899 | } else { |
| 4900 | /* It is currently mandatory to have a bdrv_reopen_prepare() |
| 4901 | * handler for each supported drv. */ |
Kevin Wolf | 4026f1c | 2023-09-29 16:51:47 +0200 | [diff] [blame] | 4902 | bdrv_graph_rdlock_main_loop(); |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 4903 | error_setg(errp, "Block format '%s' used by node '%s' " |
| 4904 | "does not support reopening files", drv->format_name, |
| 4905 | bdrv_get_device_or_node_name(reopen_state->bs)); |
Kevin Wolf | 4026f1c | 2023-09-29 16:51:47 +0200 | [diff] [blame] | 4906 | bdrv_graph_rdunlock_main_loop(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4907 | ret = -1; |
| 4908 | goto error; |
| 4909 | } |
| 4910 | |
Max Reitz | 9ad08c4 | 2018-11-16 17:45:24 +0100 | [diff] [blame] | 4911 | drv_prepared = true; |
| 4912 | |
Alberto Garcia | bacd9b8 | 2019-03-12 18:48:46 +0200 | [diff] [blame] | 4913 | /* |
| 4914 | * We must provide the 'backing' option if the BDS has a backing |
| 4915 | * file or if the image file has a backing file name as part of |
| 4916 | * its metadata. Otherwise the 'backing' option can be omitted. |
| 4917 | */ |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 4918 | bdrv_graph_rdlock_main_loop(); |
Alberto Garcia | bacd9b8 | 2019-03-12 18:48:46 +0200 | [diff] [blame] | 4919 | if (drv->supports_backing && reopen_state->backing_missing && |
Max Reitz | 1d42f48 | 2019-06-12 17:24:39 +0200 | [diff] [blame] | 4920 | (reopen_state->bs->backing || reopen_state->bs->backing_file[0])) { |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4921 | error_setg(errp, "backing is missing for '%s'", |
| 4922 | reopen_state->bs->node_name); |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 4923 | bdrv_graph_rdunlock_main_loop(); |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4924 | ret = -EINVAL; |
| 4925 | goto error; |
| 4926 | } |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 4927 | bdrv_graph_rdunlock_main_loop(); |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4928 | |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4929 | /* |
| 4930 | * Allow changing the 'backing' option. The new value can be |
| 4931 | * either a reference to an existing node (using its node name) |
| 4932 | * or NULL to simply detach the current backing file. |
| 4933 | */ |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4934 | ret = bdrv_reopen_parse_file_or_backing(reopen_state, true, |
| 4935 | change_child_tran, errp); |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4936 | if (ret < 0) { |
| 4937 | goto error; |
| 4938 | } |
| 4939 | qdict_del(reopen_state->options, "backing"); |
| 4940 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4941 | /* Allow changing the 'file' option. In this case NULL is not allowed */ |
| 4942 | ret = bdrv_reopen_parse_file_or_backing(reopen_state, false, |
| 4943 | change_child_tran, errp); |
| 4944 | if (ret < 0) { |
| 4945 | goto error; |
| 4946 | } |
| 4947 | qdict_del(reopen_state->options, "file"); |
| 4948 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4949 | /* Options that are not handled are only okay if they are unchanged |
| 4950 | * compared to the old state. It is expected that some options are only |
| 4951 | * used for the initial open, but not reopen (e.g. filename) */ |
| 4952 | if (qdict_size(reopen_state->options)) { |
| 4953 | const QDictEntry *entry = qdict_first(reopen_state->options); |
| 4954 | |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 4955 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 4956 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4957 | do { |
Max Reitz | 54fd1b0 | 2017-11-14 19:01:26 +0100 | [diff] [blame] | 4958 | QObject *new = entry->value; |
| 4959 | QObject *old = qdict_get(reopen_state->bs->options, entry->key); |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4960 | |
Alberto Garcia | db90528 | 2018-09-06 12:37:05 +0300 | [diff] [blame] | 4961 | /* Allow child references (child_name=node_name) as long as they |
| 4962 | * point to the current child (i.e. everything stays the same). */ |
| 4963 | if (qobject_type(new) == QTYPE_QSTRING) { |
| 4964 | BdrvChild *child; |
| 4965 | QLIST_FOREACH(child, &reopen_state->bs->children, next) { |
| 4966 | if (!strcmp(child->name, entry->key)) { |
| 4967 | break; |
| 4968 | } |
| 4969 | } |
| 4970 | |
| 4971 | if (child) { |
Markus Armbruster | 410f44f | 2020-12-11 18:11:42 +0100 | [diff] [blame] | 4972 | if (!strcmp(child->bs->node_name, |
| 4973 | qstring_get_str(qobject_to(QString, new)))) { |
Alberto Garcia | db90528 | 2018-09-06 12:37:05 +0300 | [diff] [blame] | 4974 | continue; /* Found child with this name, skip option */ |
| 4975 | } |
| 4976 | } |
| 4977 | } |
| 4978 | |
Max Reitz | 54fd1b0 | 2017-11-14 19:01:26 +0100 | [diff] [blame] | 4979 | /* |
| 4980 | * TODO: When using -drive to specify blockdev options, all values |
| 4981 | * will be strings; however, when using -blockdev, blockdev-add or |
| 4982 | * filenames using the json:{} pseudo-protocol, they will be |
| 4983 | * correctly typed. |
| 4984 | * In contrast, reopening options are (currently) always strings |
| 4985 | * (because you can only specify them through qemu-io; all other |
| 4986 | * callers do not specify any options). |
| 4987 | * Therefore, when using anything other than -drive to create a BDS, |
| 4988 | * this cannot detect non-string options as unchanged, because |
| 4989 | * qobject_is_equal() always returns false for objects of different |
| 4990 | * type. In the future, this should be remedied by correctly typing |
| 4991 | * all options. For now, this is not too big of an issue because |
| 4992 | * the user can simply omit options which cannot be changed anyway, |
| 4993 | * so they will stay unchanged. |
| 4994 | */ |
| 4995 | if (!qobject_is_equal(new, old)) { |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4996 | error_setg(errp, "Cannot change the option '%s'", entry->key); |
| 4997 | ret = -EINVAL; |
| 4998 | goto error; |
| 4999 | } |
| 5000 | } while ((entry = qdict_next(reopen_state->options, entry))); |
| 5001 | } |
| 5002 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5003 | ret = 0; |
| 5004 | |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 5005 | /* Restore the original reopen_state->options QDict */ |
| 5006 | qobject_unref(reopen_state->options); |
| 5007 | reopen_state->options = qobject_ref(orig_reopen_opts); |
| 5008 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5009 | error: |
Max Reitz | 9ad08c4 | 2018-11-16 17:45:24 +0100 | [diff] [blame] | 5010 | if (ret < 0 && drv_prepared) { |
| 5011 | /* drv->bdrv_reopen_prepare() has succeeded, so we need to |
| 5012 | * call drv->bdrv_reopen_abort() before signaling an error |
| 5013 | * (bdrv_reopen_multiple() will not call bdrv_reopen_abort() |
| 5014 | * when the respective bdrv_reopen_prepare() has failed) */ |
| 5015 | if (drv->bdrv_reopen_abort) { |
| 5016 | drv->bdrv_reopen_abort(reopen_state); |
| 5017 | } |
| 5018 | } |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 5019 | qemu_opts_del(opts); |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 5020 | qobject_unref(orig_reopen_opts); |
Alberto Garcia | 593b307 | 2018-09-06 12:37:08 +0300 | [diff] [blame] | 5021 | g_free(discard); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5022 | return ret; |
| 5023 | } |
| 5024 | |
| 5025 | /* |
| 5026 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and |
| 5027 | * makes them final by swapping the staging BlockDriverState contents into |
| 5028 | * the active BlockDriverState contents. |
| 5029 | */ |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 5030 | static void GRAPH_UNLOCKED bdrv_reopen_commit(BDRVReopenState *reopen_state) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5031 | { |
| 5032 | BlockDriver *drv; |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 5033 | BlockDriverState *bs; |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 5034 | BdrvChild *child; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5035 | |
| 5036 | assert(reopen_state != NULL); |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 5037 | bs = reopen_state->bs; |
| 5038 | drv = bs->drv; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5039 | assert(drv != NULL); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 5040 | GLOBAL_STATE_CODE(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5041 | |
| 5042 | /* If there are any driver level actions to take */ |
| 5043 | if (drv->bdrv_reopen_commit) { |
| 5044 | drv->bdrv_reopen_commit(reopen_state); |
| 5045 | } |
| 5046 | |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 5047 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 5048 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5049 | /* set BDS specific flags now */ |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5050 | qobject_unref(bs->explicit_options); |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 5051 | qobject_unref(bs->options); |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 5052 | qobject_ref(reopen_state->explicit_options); |
| 5053 | qobject_ref(reopen_state->options); |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 5054 | |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 5055 | bs->explicit_options = reopen_state->explicit_options; |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 5056 | bs->options = reopen_state->options; |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 5057 | bs->open_flags = reopen_state->flags; |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 5058 | bs->detect_zeroes = reopen_state->detect_zeroes; |
Kevin Wolf | 355ef4a | 2013-12-11 20:14:09 +0100 | [diff] [blame] | 5059 | |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 5060 | /* Remove child references from bs->options and bs->explicit_options. |
| 5061 | * Child options were already removed in bdrv_reopen_queue_child() */ |
| 5062 | QLIST_FOREACH(child, &bs->children, next) { |
| 5063 | qdict_del(bs->explicit_options, child->name); |
| 5064 | qdict_del(bs->options, child->name); |
| 5065 | } |
Vladimir Sementsov-Ogievskiy | 3d0e874 | 2021-06-10 15:05:35 +0300 | [diff] [blame] | 5066 | /* backing is probably removed, so it's not handled by previous loop */ |
| 5067 | qdict_del(bs->explicit_options, "backing"); |
| 5068 | qdict_del(bs->options, "backing"); |
| 5069 | |
Vladimir Sementsov-Ogievskiy | 1e4c797 | 2021-04-28 18:17:55 +0300 | [diff] [blame] | 5070 | bdrv_refresh_limits(bs, NULL, NULL); |
Paolo Bonzini | 439cc33 | 2023-04-07 17:32:58 +0200 | [diff] [blame] | 5071 | bdrv_refresh_total_sectors(bs, bs->total_sectors); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5072 | } |
| 5073 | |
| 5074 | /* |
| 5075 | * Abort the reopen, and delete and free the staged changes in |
| 5076 | * reopen_state |
| 5077 | */ |
Kevin Wolf | ce433d2 | 2023-09-29 16:51:43 +0200 | [diff] [blame] | 5078 | static void GRAPH_UNLOCKED bdrv_reopen_abort(BDRVReopenState *reopen_state) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5079 | { |
| 5080 | BlockDriver *drv; |
| 5081 | |
| 5082 | assert(reopen_state != NULL); |
| 5083 | drv = reopen_state->bs->drv; |
| 5084 | assert(drv != NULL); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 5085 | GLOBAL_STATE_CODE(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5086 | |
| 5087 | if (drv->bdrv_reopen_abort) { |
| 5088 | drv->bdrv_reopen_abort(reopen_state); |
| 5089 | } |
| 5090 | } |
| 5091 | |
| 5092 | |
Max Reitz | 64dff52 | 2016-01-29 16:36:10 +0100 | [diff] [blame] | 5093 | static void bdrv_close(BlockDriverState *bs) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 5094 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5095 | BdrvAioNotifier *ban, *ban_next; |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5096 | BdrvChild *child, *next; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5097 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5098 | GLOBAL_STATE_CODE(); |
Max Reitz | 30f55fb | 2016-05-17 16:41:32 +0200 | [diff] [blame] | 5099 | assert(!bs->refcnt); |
Alberto Garcia | 99b7e77 | 2015-09-25 16:41:44 +0300 | [diff] [blame] | 5100 | |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 5101 | bdrv_drained_begin(bs); /* complete I/O */ |
Stefan Hajnoczi | 58fda17 | 2013-07-02 15:36:25 +0200 | [diff] [blame] | 5102 | bdrv_flush(bs); |
Fam Zheng | 53ec73e | 2015-05-29 18:53:14 +0800 | [diff] [blame] | 5103 | bdrv_drain(bs); /* in case flush left pending I/O */ |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 5104 | |
Paolo Bonzini | 3cbc002 | 2012-10-19 11:36:48 +0200 | [diff] [blame] | 5105 | if (bs->drv) { |
Vladimir Sementsov-Ogievskiy | 3c00529 | 2018-08-14 15:43:19 +0300 | [diff] [blame] | 5106 | if (bs->drv->bdrv_close) { |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5107 | /* Must unfreeze all children, so bdrv_unref_child() works */ |
Vladimir Sementsov-Ogievskiy | 3c00529 | 2018-08-14 15:43:19 +0300 | [diff] [blame] | 5108 | bs->drv->bdrv_close(bs); |
| 5109 | } |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 5110 | bs->drv = NULL; |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 5111 | } |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 5112 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5113 | bdrv_graph_wrlock(); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5114 | QLIST_FOREACH_SAFE(child, &bs->children, next, next) { |
Alberto Garcia | dd4118c | 2019-05-13 16:46:17 +0300 | [diff] [blame] | 5115 | bdrv_unref_child(bs, child); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5116 | } |
| 5117 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 5118 | assert(!bs->backing); |
| 5119 | assert(!bs->file); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5120 | bdrv_graph_wrunlock(); |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 5121 | |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5122 | g_free(bs->opaque); |
| 5123 | bs->opaque = NULL; |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 5124 | qatomic_set(&bs->copy_on_read, 0); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5125 | bs->backing_file[0] = '\0'; |
| 5126 | bs->backing_format[0] = '\0'; |
| 5127 | bs->total_sectors = 0; |
| 5128 | bs->encrypted = false; |
| 5129 | bs->sg = false; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5130 | qobject_unref(bs->options); |
| 5131 | qobject_unref(bs->explicit_options); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5132 | bs->options = NULL; |
| 5133 | bs->explicit_options = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5134 | qobject_unref(bs->full_open_options); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5135 | bs->full_open_options = NULL; |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 5136 | g_free(bs->block_status_cache); |
| 5137 | bs->block_status_cache = NULL; |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5138 | |
Vladimir Sementsov-Ogievskiy | cca43ae | 2017-06-28 15:05:16 +0300 | [diff] [blame] | 5139 | bdrv_release_named_dirty_bitmaps(bs); |
| 5140 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
| 5141 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5142 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 5143 | g_free(ban); |
| 5144 | } |
| 5145 | QLIST_INIT(&bs->aio_notifiers); |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 5146 | bdrv_drained_end(bs); |
Greg Kurz | 1a6d3bd | 2020-10-23 17:01:10 +0200 | [diff] [blame] | 5147 | |
| 5148 | /* |
| 5149 | * If we're still inside some bdrv_drain_all_begin()/end() sections, end |
| 5150 | * them now since this BDS won't exist anymore when bdrv_drain_all_end() |
| 5151 | * gets called. |
| 5152 | */ |
| 5153 | if (bs->quiesce_counter) { |
| 5154 | bdrv_drain_all_end_quiesce(bs); |
| 5155 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 5156 | } |
| 5157 | |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 5158 | void bdrv_close_all(void) |
| 5159 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5160 | GLOBAL_STATE_CODE(); |
Emanuele Giuseppe Esposito | 880eeec | 2022-09-26 05:32:04 -0400 | [diff] [blame] | 5161 | assert(job_next(NULL) == NULL); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 5162 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 5163 | /* Drop references from requests still in flight, such as canceled block |
| 5164 | * jobs whose AIO context has not been polled yet */ |
| 5165 | bdrv_drain_all(); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 5166 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 5167 | blk_remove_all_bs(); |
| 5168 | blockdev_close_all_bdrv_states(); |
| 5169 | |
Kevin Wolf | a1a2af0 | 2016-04-08 18:26:37 +0200 | [diff] [blame] | 5170 | assert(QTAILQ_EMPTY(&all_bdrv_states)); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 5171 | } |
| 5172 | |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5173 | static bool GRAPH_RDLOCK should_update_child(BdrvChild *c, BlockDriverState *to) |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5174 | { |
Vladimir Sementsov-Ogievskiy | 2f30b7c | 2019-02-23 22:20:39 +0300 | [diff] [blame] | 5175 | GQueue *queue; |
| 5176 | GHashTable *found; |
| 5177 | bool ret; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5178 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 5179 | if (c->klass->stay_at_node) { |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 5180 | return false; |
| 5181 | } |
| 5182 | |
Max Reitz | ec9f10f | 2018-06-13 20:18:15 +0200 | [diff] [blame] | 5183 | /* If the child @c belongs to the BDS @to, replacing the current |
| 5184 | * c->bs by @to would mean to create a loop. |
| 5185 | * |
| 5186 | * Such a case occurs when appending a BDS to a backing chain. |
| 5187 | * For instance, imagine the following chain: |
| 5188 | * |
| 5189 | * guest device -> node A -> further backing chain... |
| 5190 | * |
| 5191 | * Now we create a new BDS B which we want to put on top of this |
| 5192 | * chain, so we first attach A as its backing node: |
| 5193 | * |
| 5194 | * node B |
| 5195 | * | |
| 5196 | * v |
| 5197 | * guest device -> node A -> further backing chain... |
| 5198 | * |
| 5199 | * Finally we want to replace A by B. When doing that, we want to |
| 5200 | * replace all pointers to A by pointers to B -- except for the |
| 5201 | * pointer from B because (1) that would create a loop, and (2) |
| 5202 | * that pointer should simply stay intact: |
| 5203 | * |
| 5204 | * guest device -> node B |
| 5205 | * | |
| 5206 | * v |
| 5207 | * node A -> further backing chain... |
| 5208 | * |
| 5209 | * In general, when replacing a node A (c->bs) by a node B (@to), |
| 5210 | * if A is a child of B, that means we cannot replace A by B there |
| 5211 | * because that would create a loop. Silently detaching A from B |
| 5212 | * 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] | 5213 | * place there is the most sensible choice. |
| 5214 | * |
| 5215 | * We would also create a loop in any cases where @c is only |
| 5216 | * indirectly referenced by @to. Prevent this by returning false |
| 5217 | * if @c is found (by breadth-first search) anywhere in the whole |
| 5218 | * subtree of @to. |
| 5219 | */ |
| 5220 | |
| 5221 | ret = true; |
| 5222 | found = g_hash_table_new(NULL, NULL); |
| 5223 | g_hash_table_add(found, to); |
| 5224 | queue = g_queue_new(); |
| 5225 | g_queue_push_tail(queue, to); |
| 5226 | |
| 5227 | while (!g_queue_is_empty(queue)) { |
| 5228 | BlockDriverState *v = g_queue_pop_head(queue); |
| 5229 | BdrvChild *c2; |
| 5230 | |
| 5231 | QLIST_FOREACH(c2, &v->children, next) { |
| 5232 | if (c2 == c) { |
| 5233 | ret = false; |
| 5234 | break; |
| 5235 | } |
| 5236 | |
| 5237 | if (g_hash_table_contains(found, c2->bs)) { |
| 5238 | continue; |
| 5239 | } |
| 5240 | |
| 5241 | g_queue_push_tail(queue, c2->bs); |
| 5242 | g_hash_table_add(found, c2->bs); |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 5243 | } |
| 5244 | } |
| 5245 | |
Vladimir Sementsov-Ogievskiy | 2f30b7c | 2019-02-23 22:20:39 +0300 | [diff] [blame] | 5246 | g_queue_free(queue); |
| 5247 | g_hash_table_destroy(found); |
| 5248 | |
| 5249 | return ret; |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 5250 | } |
| 5251 | |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 5252 | static void bdrv_remove_child_commit(void *opaque) |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5253 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 5254 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 5255 | bdrv_child_free(opaque); |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5256 | } |
| 5257 | |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 5258 | static TransactionActionDrv bdrv_remove_child_drv = { |
| 5259 | .commit = bdrv_remove_child_commit, |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5260 | }; |
| 5261 | |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5262 | /* |
| 5263 | * Function doesn't update permissions, caller is responsible for this. |
| 5264 | * |
| 5265 | * @child->bs (if non-NULL) must be drained. |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 5266 | * |
| 5267 | * After calling this function, the transaction @tran may only be completed |
| 5268 | * while holding a writer lock for the graph. |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5269 | */ |
| 5270 | static void GRAPH_WRLOCK bdrv_remove_child(BdrvChild *child, Transaction *tran) |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5271 | { |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5272 | if (!child) { |
| 5273 | return; |
| 5274 | } |
| 5275 | |
| 5276 | if (child->bs) { |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5277 | assert(child->quiesced_parent); |
Vladimir Sementsov-Ogievskiy | a2c37a3 | 2022-07-26 23:11:30 +0300 | [diff] [blame] | 5278 | bdrv_replace_child_tran(child, NULL, tran); |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5279 | } |
| 5280 | |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 5281 | tran_add(tran, &bdrv_remove_child_drv, child); |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5282 | } |
| 5283 | |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5284 | /* |
| 5285 | * Both @from and @to (if non-NULL) must be drained. @to must be kept drained |
| 5286 | * until the transaction is completed. |
Kevin Wolf | 5661a00 | 2023-09-11 11:46:10 +0200 | [diff] [blame] | 5287 | * |
| 5288 | * After calling this function, the transaction @tran may only be completed |
| 5289 | * while holding a writer lock for the graph. |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5290 | */ |
| 5291 | static int GRAPH_WRLOCK |
| 5292 | bdrv_replace_node_noperm(BlockDriverState *from, |
| 5293 | BlockDriverState *to, |
| 5294 | bool auto_skip, Transaction *tran, |
| 5295 | Error **errp) |
Vladimir Sementsov-Ogievskiy | 117caba | 2021-04-28 18:17:48 +0300 | [diff] [blame] | 5296 | { |
| 5297 | BdrvChild *c, *next; |
| 5298 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 5299 | GLOBAL_STATE_CODE(); |
Hanna Reitz | 82b54cf | 2021-11-15 15:54:04 +0100 | [diff] [blame] | 5300 | |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5301 | assert(from->quiesce_counter); |
| 5302 | assert(to->quiesce_counter); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 5303 | |
Vladimir Sementsov-Ogievskiy | 117caba | 2021-04-28 18:17:48 +0300 | [diff] [blame] | 5304 | QLIST_FOREACH_SAFE(c, &from->parents, next_parent, next) { |
| 5305 | assert(c->bs == from); |
| 5306 | if (!should_update_child(c, to)) { |
| 5307 | if (auto_skip) { |
| 5308 | continue; |
| 5309 | } |
| 5310 | error_setg(errp, "Should not change '%s' link to '%s'", |
| 5311 | c->name, from->node_name); |
| 5312 | return -EINVAL; |
| 5313 | } |
| 5314 | if (c->frozen) { |
| 5315 | error_setg(errp, "Cannot change '%s' link to '%s'", |
| 5316 | c->name, from->node_name); |
| 5317 | return -EPERM; |
| 5318 | } |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 5319 | bdrv_replace_child_tran(c, to, tran); |
Vladimir Sementsov-Ogievskiy | 117caba | 2021-04-28 18:17:48 +0300 | [diff] [blame] | 5320 | } |
| 5321 | |
| 5322 | return 0; |
| 5323 | } |
| 5324 | |
Vladimir Sementsov-Ogievskiy | 313274b | 2020-11-06 15:42:36 +0300 | [diff] [blame] | 5325 | /* |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5326 | * Switch all parents of @from to point to @to instead. @from and @to must be in |
| 5327 | * the same AioContext and both must be drained. |
| 5328 | * |
Vladimir Sementsov-Ogievskiy | 313274b | 2020-11-06 15:42:36 +0300 | [diff] [blame] | 5329 | * With auto_skip=true bdrv_replace_node_common skips updating from parents |
| 5330 | * if it creates a parent-child relation loop or if parent is block-job. |
| 5331 | * |
| 5332 | * With auto_skip=false the error is returned if from has a parent which should |
| 5333 | * not be updated. |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5334 | * |
| 5335 | * With @detach_subchain=true @to must be in a backing chain of @from. In this |
| 5336 | * case backing link of the cow-parent of @to is removed. |
Vladimir Sementsov-Ogievskiy | 313274b | 2020-11-06 15:42:36 +0300 | [diff] [blame] | 5337 | */ |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5338 | static int GRAPH_WRLOCK |
| 5339 | bdrv_replace_node_common(BlockDriverState *from, BlockDriverState *to, |
| 5340 | bool auto_skip, bool detach_subchain, Error **errp) |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5341 | { |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5342 | Transaction *tran = tran_new(); |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5343 | g_autoptr(GSList) refresh_list = NULL; |
Miroslav Rezanina | 2d369d6 | 2021-05-05 03:59:03 -0400 | [diff] [blame] | 5344 | BlockDriverState *to_cow_parent = NULL; |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5345 | int ret; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5346 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 5347 | GLOBAL_STATE_CODE(); |
Hanna Reitz | 82b54cf | 2021-11-15 15:54:04 +0100 | [diff] [blame] | 5348 | |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5349 | assert(from->quiesce_counter); |
| 5350 | assert(to->quiesce_counter); |
Kevin Wolf | 30dd65f | 2020-03-10 12:38:29 +0100 | [diff] [blame] | 5351 | assert(bdrv_get_aio_context(from) == bdrv_get_aio_context(to)); |
Kevin Wolf | f871abd | 2019-05-21 19:00:25 +0200 | [diff] [blame] | 5352 | |
Kevin Wolf | 372b69f | 2023-10-27 17:53:15 +0200 | [diff] [blame] | 5353 | if (detach_subchain) { |
| 5354 | assert(bdrv_chain_contains(from, to)); |
| 5355 | assert(from != to); |
| 5356 | for (to_cow_parent = from; |
| 5357 | bdrv_filter_or_cow_bs(to_cow_parent) != to; |
| 5358 | to_cow_parent = bdrv_filter_or_cow_bs(to_cow_parent)) |
| 5359 | { |
| 5360 | ; |
| 5361 | } |
| 5362 | } |
| 5363 | |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5364 | /* |
| 5365 | * Do the replacement without permission update. |
| 5366 | * Replacement may influence the permissions, we should calculate new |
| 5367 | * permissions based on new graph. If we fail, we'll roll-back the |
| 5368 | * replacement. |
| 5369 | */ |
Vladimir Sementsov-Ogievskiy | 117caba | 2021-04-28 18:17:48 +0300 | [diff] [blame] | 5370 | ret = bdrv_replace_node_noperm(from, to, auto_skip, tran, errp); |
| 5371 | if (ret < 0) { |
| 5372 | goto out; |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5373 | } |
| 5374 | |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5375 | if (detach_subchain) { |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5376 | /* to_cow_parent is already drained because from is drained */ |
Vladimir Sementsov-Ogievskiy | f38eaec | 2022-11-07 19:35:56 +0300 | [diff] [blame] | 5377 | 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] | 5378 | } |
| 5379 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 5380 | refresh_list = g_slist_prepend(refresh_list, to); |
| 5381 | refresh_list = g_slist_prepend(refresh_list, from); |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5382 | |
| 5383 | ret = bdrv_list_refresh_perms(refresh_list, NULL, tran, errp); |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5384 | if (ret < 0) { |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5385 | goto out; |
| 5386 | } |
| 5387 | |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 5388 | ret = 0; |
| 5389 | |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5390 | out: |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5391 | tran_finalize(tran, ret); |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5392 | return ret; |
| 5393 | } |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5394 | |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5395 | int bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, |
| 5396 | Error **errp) |
| 5397 | { |
Kevin Wolf | ccd6a37 | 2023-10-27 17:53:25 +0200 | [diff] [blame] | 5398 | return bdrv_replace_node_common(from, to, true, false, errp); |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5399 | } |
| 5400 | |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5401 | int bdrv_drop_filter(BlockDriverState *bs, Error **errp) |
| 5402 | { |
Kevin Wolf | 372b69f | 2023-10-27 17:53:15 +0200 | [diff] [blame] | 5403 | BlockDriverState *child_bs; |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5404 | int ret; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5405 | |
Kevin Wolf | 372b69f | 2023-10-27 17:53:15 +0200 | [diff] [blame] | 5406 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5407 | |
Kevin Wolf | 372b69f | 2023-10-27 17:53:15 +0200 | [diff] [blame] | 5408 | bdrv_graph_rdlock_main_loop(); |
| 5409 | child_bs = bdrv_filter_or_cow_bs(bs); |
| 5410 | bdrv_graph_rdunlock_main_loop(); |
| 5411 | |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5412 | bdrv_drained_begin(child_bs); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5413 | bdrv_graph_wrlock(); |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5414 | ret = bdrv_replace_node_common(bs, child_bs, true, true, errp); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5415 | bdrv_graph_wrunlock(); |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5416 | bdrv_drained_end(child_bs); |
| 5417 | |
| 5418 | return ret; |
Vladimir Sementsov-Ogievskiy | 313274b | 2020-11-06 15:42:36 +0300 | [diff] [blame] | 5419 | } |
| 5420 | |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5421 | /* |
| 5422 | * Add new bs contents at the top of an image chain while the chain is |
| 5423 | * live, while keeping required fields on the top layer. |
| 5424 | * |
| 5425 | * This will modify the BlockDriverState fields, and swap contents |
| 5426 | * between bs_new and bs_top. Both bs_new and bs_top are modified. |
| 5427 | * |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5428 | * bs_new must not be attached to a BlockBackend and must not have backing |
| 5429 | * child. |
Jeff Cody | f6801b8 | 2012-03-27 16:30:19 -0400 | [diff] [blame] | 5430 | * |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5431 | * This function does not create any image files. |
| 5432 | */ |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 5433 | int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, |
| 5434 | Error **errp) |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5435 | { |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5436 | int ret; |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 5437 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5438 | Transaction *tran = tran_new(); |
| 5439 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5440 | GLOBAL_STATE_CODE(); |
| 5441 | |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 5442 | bdrv_graph_rdlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5443 | assert(!bs_new->backing); |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 5444 | bdrv_graph_rdunlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5445 | |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 5446 | bdrv_drained_begin(bs_top); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 5447 | bdrv_drained_begin(bs_new); |
Kevin Wolf | 7d4ca9d | 2023-09-11 11:46:09 +0200 | [diff] [blame] | 5448 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5449 | bdrv_graph_wrlock(); |
Stefano Garzarella | 60d90bf | 2023-02-14 18:16:21 +0100 | [diff] [blame] | 5450 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 5451 | child = bdrv_attach_child_noperm(bs_new, bs_top, "backing", |
| 5452 | &child_of_bds, bdrv_backing_role(bs_new), |
| 5453 | tran, errp); |
| 5454 | if (!child) { |
| 5455 | ret = -EINVAL; |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5456 | goto out; |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 5457 | } |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5458 | |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5459 | 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] | 5460 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5461 | goto out; |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5462 | } |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5463 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 5464 | ret = bdrv_refresh_perms(bs_new, tran, errp); |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5465 | out: |
| 5466 | tran_finalize(tran, ret); |
| 5467 | |
Vladimir Sementsov-Ogievskiy | 1e4c797 | 2021-04-28 18:17:55 +0300 | [diff] [blame] | 5468 | bdrv_refresh_limits(bs_top, NULL, NULL); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5469 | bdrv_graph_wrunlock(); |
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_end(bs_top); |
| 5472 | bdrv_drained_end(bs_new); |
Kevin Wolf | 2f64e1f | 2023-09-11 11:46:08 +0200 | [diff] [blame] | 5473 | |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5474 | return ret; |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5475 | } |
| 5476 | |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5477 | /* Not for empty child */ |
| 5478 | int bdrv_replace_child_bs(BdrvChild *child, BlockDriverState *new_bs, |
| 5479 | Error **errp) |
| 5480 | { |
| 5481 | int ret; |
| 5482 | Transaction *tran = tran_new(); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5483 | g_autoptr(GSList) refresh_list = NULL; |
| 5484 | BlockDriverState *old_bs = child->bs; |
| 5485 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5486 | GLOBAL_STATE_CODE(); |
| 5487 | |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5488 | bdrv_ref(old_bs); |
| 5489 | bdrv_drained_begin(old_bs); |
| 5490 | bdrv_drained_begin(new_bs); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5491 | bdrv_graph_wrlock(); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5492 | |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 5493 | bdrv_replace_child_tran(child, new_bs, tran); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5494 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 5495 | refresh_list = g_slist_prepend(refresh_list, old_bs); |
| 5496 | refresh_list = g_slist_prepend(refresh_list, new_bs); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5497 | |
| 5498 | ret = bdrv_list_refresh_perms(refresh_list, NULL, tran, errp); |
| 5499 | |
| 5500 | tran_finalize(tran, ret); |
| 5501 | |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5502 | bdrv_graph_wrunlock(); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5503 | bdrv_drained_end(old_bs); |
| 5504 | bdrv_drained_end(new_bs); |
| 5505 | bdrv_unref(old_bs); |
| 5506 | |
| 5507 | return ret; |
| 5508 | } |
| 5509 | |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 5510 | static void bdrv_delete(BlockDriverState *bs) |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 5511 | { |
Fam Zheng | 3718d8a | 2014-05-23 21:29:43 +0800 | [diff] [blame] | 5512 | assert(bdrv_op_blocker_is_empty(bs)); |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 5513 | assert(!bs->refcnt); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5514 | GLOBAL_STATE_CODE(); |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 5515 | |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 5516 | /* remove from list, if necessary */ |
Kevin Wolf | 63eaaae | 2016-03-18 10:46:57 +0100 | [diff] [blame] | 5517 | if (bs->node_name[0] != '\0') { |
| 5518 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); |
| 5519 | } |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 5520 | QTAILQ_REMOVE(&all_bdrv_states, bs, bs_list); |
| 5521 | |
Anton Kuchin | 30c321f | 2019-05-07 11:12:56 +0300 | [diff] [blame] | 5522 | bdrv_close(bs); |
| 5523 | |
Stefan Hajnoczi | fa9185f | 2023-08-08 11:58:52 -0400 | [diff] [blame] | 5524 | qemu_mutex_destroy(&bs->reqs_lock); |
| 5525 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 5526 | g_free(bs); |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 5527 | } |
| 5528 | |
Vladimir Sementsov-Ogievskiy | 96796fa | 2021-09-20 14:55:36 +0300 | [diff] [blame] | 5529 | |
| 5530 | /* |
| 5531 | * Replace @bs by newly created block node. |
| 5532 | * |
| 5533 | * @options is a QDict of options to pass to the block drivers, or NULL for an |
| 5534 | * empty set of options. The reference to the QDict belongs to the block layer |
| 5535 | * after the call (even on failure), so if the caller intends to reuse the |
| 5536 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. |
Kevin Wolf | 8823407 | 2023-05-25 14:47:11 +0200 | [diff] [blame] | 5537 | * |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 5538 | * The caller must make sure that @bs stays in the same AioContext, i.e. |
| 5539 | * @options must not refer to nodes in a different AioContext. |
Vladimir Sementsov-Ogievskiy | 96796fa | 2021-09-20 14:55:36 +0300 | [diff] [blame] | 5540 | */ |
| 5541 | BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *options, |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5542 | int flags, Error **errp) |
| 5543 | { |
Vladimir Sementsov-Ogievskiy | f053b7e | 2021-09-20 14:55:35 +0300 | [diff] [blame] | 5544 | ERRP_GUARD(); |
| 5545 | int ret; |
Kevin Wolf | 8823407 | 2023-05-25 14:47:11 +0200 | [diff] [blame] | 5546 | AioContext *ctx = bdrv_get_aio_context(bs); |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5547 | BlockDriverState *new_node_bs = NULL; |
| 5548 | const char *drvname, *node_name; |
| 5549 | BlockDriver *drv; |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5550 | |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5551 | drvname = qdict_get_try_str(options, "driver"); |
| 5552 | if (!drvname) { |
| 5553 | error_setg(errp, "driver is not specified"); |
| 5554 | goto fail; |
| 5555 | } |
| 5556 | |
| 5557 | drv = bdrv_find_format(drvname); |
| 5558 | if (!drv) { |
| 5559 | error_setg(errp, "Unknown driver: '%s'", drvname); |
| 5560 | goto fail; |
| 5561 | } |
| 5562 | |
| 5563 | node_name = qdict_get_try_str(options, "node-name"); |
| 5564 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5565 | GLOBAL_STATE_CODE(); |
| 5566 | |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5567 | new_node_bs = bdrv_new_open_driver_opts(drv, node_name, options, flags, |
| 5568 | errp); |
Kevin Wolf | 8823407 | 2023-05-25 14:47:11 +0200 | [diff] [blame] | 5569 | assert(bdrv_get_aio_context(bs) == ctx); |
| 5570 | |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5571 | options = NULL; /* bdrv_new_open_driver() eats options */ |
| 5572 | if (!new_node_bs) { |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5573 | error_prepend(errp, "Could not create node: "); |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5574 | goto fail; |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5575 | } |
| 5576 | |
Kevin Wolf | ccd6a37 | 2023-10-27 17:53:25 +0200 | [diff] [blame] | 5577 | /* |
| 5578 | * Make sure that @bs doesn't go away until we have successfully attached |
| 5579 | * all of its parents to @new_node_bs and undrained it again. |
| 5580 | */ |
| 5581 | bdrv_ref(bs); |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5582 | bdrv_drained_begin(bs); |
Kevin Wolf | ccd6a37 | 2023-10-27 17:53:25 +0200 | [diff] [blame] | 5583 | bdrv_drained_begin(new_node_bs); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5584 | bdrv_graph_wrlock(); |
Vladimir Sementsov-Ogievskiy | f053b7e | 2021-09-20 14:55:35 +0300 | [diff] [blame] | 5585 | ret = bdrv_replace_node(bs, new_node_bs, errp); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5586 | bdrv_graph_wrunlock(); |
Kevin Wolf | ccd6a37 | 2023-10-27 17:53:25 +0200 | [diff] [blame] | 5587 | bdrv_drained_end(new_node_bs); |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5588 | bdrv_drained_end(bs); |
Kevin Wolf | ccd6a37 | 2023-10-27 17:53:25 +0200 | [diff] [blame] | 5589 | bdrv_unref(bs); |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5590 | |
Vladimir Sementsov-Ogievskiy | f053b7e | 2021-09-20 14:55:35 +0300 | [diff] [blame] | 5591 | if (ret < 0) { |
| 5592 | error_prepend(errp, "Could not replace node: "); |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5593 | goto fail; |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5594 | } |
| 5595 | |
| 5596 | return new_node_bs; |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5597 | |
| 5598 | fail: |
| 5599 | qobject_unref(options); |
| 5600 | bdrv_unref(new_node_bs); |
| 5601 | return NULL; |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5602 | } |
| 5603 | |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 5604 | /* |
| 5605 | * Run consistency checks on an image |
| 5606 | * |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 5607 | * 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] | 5608 | * 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] | 5609 | * check are stored in res. |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 5610 | */ |
Vladimir Sementsov-Ogievskiy | 21c2283 | 2020-09-24 21:54:10 +0300 | [diff] [blame] | 5611 | int coroutine_fn bdrv_co_check(BlockDriverState *bs, |
| 5612 | BdrvCheckResult *res, BdrvCheckMode fix) |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 5613 | { |
Emanuele Giuseppe Esposito | 1581a70 | 2022-03-03 10:16:09 -0500 | [diff] [blame] | 5614 | IO_CODE(); |
Kevin Wolf | 1b3ff9f | 2022-12-07 14:18:38 +0100 | [diff] [blame] | 5615 | assert_bdrv_graph_readable(); |
Max Reitz | 908bcd5 | 2014-08-07 22:47:55 +0200 | [diff] [blame] | 5616 | if (bs->drv == NULL) { |
| 5617 | return -ENOMEDIUM; |
| 5618 | } |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 5619 | if (bs->drv->bdrv_co_check == NULL) { |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 5620 | return -ENOTSUP; |
| 5621 | } |
| 5622 | |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 5623 | memset(res, 0, sizeof(*res)); |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 5624 | return bs->drv->bdrv_co_check(bs, res, fix); |
| 5625 | } |
| 5626 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5627 | /* |
| 5628 | * Return values: |
| 5629 | * 0 - success |
| 5630 | * -EINVAL - backing format specified, but no file |
| 5631 | * -ENOSPC - can't update the backing file because no space is left in the |
| 5632 | * image file header |
| 5633 | * -ENOTSUP - format driver doesn't support changing the backing file |
| 5634 | */ |
Kevin Wolf | e2dd273 | 2023-10-27 17:53:28 +0200 | [diff] [blame] | 5635 | int coroutine_fn |
| 5636 | bdrv_co_change_backing_file(BlockDriverState *bs, const char *backing_file, |
| 5637 | const char *backing_fmt, bool require) |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5638 | { |
| 5639 | BlockDriver *drv = bs->drv; |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5640 | int ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5641 | |
Kevin Wolf | e2dd273 | 2023-10-27 17:53:28 +0200 | [diff] [blame] | 5642 | IO_CODE(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5643 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 5644 | if (!drv) { |
| 5645 | return -ENOMEDIUM; |
| 5646 | } |
| 5647 | |
Paolo Bonzini | 5f37779 | 2012-04-12 14:01:01 +0200 | [diff] [blame] | 5648 | /* Backing file format doesn't make sense without a backing file */ |
| 5649 | if (backing_fmt && !backing_file) { |
| 5650 | return -EINVAL; |
| 5651 | } |
| 5652 | |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 5653 | if (require && backing_file && !backing_fmt) { |
| 5654 | return -EINVAL; |
Eric Blake | e54ee1b | 2020-07-06 15:39:53 -0500 | [diff] [blame] | 5655 | } |
| 5656 | |
Kevin Wolf | e2dd273 | 2023-10-27 17:53:28 +0200 | [diff] [blame] | 5657 | if (drv->bdrv_co_change_backing_file != NULL) { |
| 5658 | ret = drv->bdrv_co_change_backing_file(bs, backing_file, backing_fmt); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5659 | } else { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5660 | ret = -ENOTSUP; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5661 | } |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5662 | |
| 5663 | if (ret == 0) { |
| 5664 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
| 5665 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 5666 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), |
| 5667 | backing_file ?: ""); |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5668 | } |
| 5669 | return ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5670 | } |
| 5671 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5672 | /* |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 5673 | * Finds the first non-filter node above bs in the chain between |
| 5674 | * active and bs. The returned node is either an immediate parent of |
| 5675 | * bs, or there are only filter nodes between the two. |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5676 | * |
| 5677 | * Returns NULL if bs is not found in active's image chain, |
| 5678 | * or if active == bs. |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 5679 | * |
| 5680 | * Returns the bottommost base image if bs == NULL. |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5681 | */ |
| 5682 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, |
| 5683 | BlockDriverState *bs) |
| 5684 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5685 | |
| 5686 | GLOBAL_STATE_CODE(); |
| 5687 | |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 5688 | bs = bdrv_skip_filters(bs); |
| 5689 | active = bdrv_skip_filters(active); |
| 5690 | |
| 5691 | while (active) { |
| 5692 | BlockDriverState *next = bdrv_backing_chain_next(active); |
| 5693 | if (bs == next) { |
| 5694 | return active; |
| 5695 | } |
| 5696 | active = next; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5697 | } |
| 5698 | |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 5699 | return NULL; |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 5700 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5701 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 5702 | /* Given a BDS, searches for the base layer. */ |
| 5703 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
| 5704 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5705 | GLOBAL_STATE_CODE(); |
| 5706 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 5707 | return bdrv_find_overlay(bs, NULL); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5708 | } |
| 5709 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5710 | /* |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5711 | * Return true if at least one of the COW (backing) and filter links |
| 5712 | * 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] | 5713 | * @base must be reachable from @bs, or NULL. |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5714 | */ |
Kevin Wolf | 9275fc7 | 2023-10-27 17:53:18 +0200 | [diff] [blame] | 5715 | static bool GRAPH_RDLOCK |
| 5716 | bdrv_is_backing_chain_frozen(BlockDriverState *bs, BlockDriverState *base, |
| 5717 | Error **errp) |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5718 | { |
| 5719 | BlockDriverState *i; |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5720 | BdrvChild *child; |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5721 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5722 | GLOBAL_STATE_CODE(); |
| 5723 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5724 | for (i = bs; i != base; i = child_bs(child)) { |
| 5725 | child = bdrv_filter_or_cow_child(i); |
| 5726 | |
| 5727 | if (child && child->frozen) { |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5728 | error_setg(errp, "Cannot change '%s' link from '%s' to '%s'", |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5729 | child->name, i->node_name, child->bs->node_name); |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5730 | return true; |
| 5731 | } |
| 5732 | } |
| 5733 | |
| 5734 | return false; |
| 5735 | } |
| 5736 | |
| 5737 | /* |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5738 | * Freeze all COW (backing) and filter links between @bs and @base. |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5739 | * If any of the links is already frozen the operation is aborted and |
| 5740 | * none of the links are modified. |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5741 | * @base must be reachable from @bs, or NULL. |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5742 | * Returns 0 on success. On failure returns < 0 and sets @errp. |
| 5743 | */ |
| 5744 | int bdrv_freeze_backing_chain(BlockDriverState *bs, BlockDriverState *base, |
| 5745 | Error **errp) |
| 5746 | { |
| 5747 | BlockDriverState *i; |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5748 | BdrvChild *child; |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5749 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5750 | GLOBAL_STATE_CODE(); |
| 5751 | |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5752 | if (bdrv_is_backing_chain_frozen(bs, base, errp)) { |
| 5753 | return -EPERM; |
| 5754 | } |
| 5755 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5756 | for (i = bs; i != base; i = child_bs(child)) { |
| 5757 | child = bdrv_filter_or_cow_child(i); |
| 5758 | if (child && child->bs->never_freeze) { |
Max Reitz | e5182c1 | 2019-07-03 19:28:02 +0200 | [diff] [blame] | 5759 | error_setg(errp, "Cannot freeze '%s' link to '%s'", |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5760 | child->name, child->bs->node_name); |
Max Reitz | e5182c1 | 2019-07-03 19:28:02 +0200 | [diff] [blame] | 5761 | return -EPERM; |
| 5762 | } |
| 5763 | } |
| 5764 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5765 | for (i = bs; i != base; i = child_bs(child)) { |
| 5766 | child = bdrv_filter_or_cow_child(i); |
| 5767 | if (child) { |
| 5768 | child->frozen = true; |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5769 | } |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5770 | } |
| 5771 | |
| 5772 | return 0; |
| 5773 | } |
| 5774 | |
| 5775 | /* |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5776 | * Unfreeze all COW (backing) and filter links between @bs and @base. |
| 5777 | * The caller must ensure that all links are frozen before using this |
| 5778 | * function. |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5779 | * @base must be reachable from @bs, or NULL. |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5780 | */ |
| 5781 | void bdrv_unfreeze_backing_chain(BlockDriverState *bs, BlockDriverState *base) |
| 5782 | { |
| 5783 | BlockDriverState *i; |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5784 | BdrvChild *child; |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5785 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5786 | GLOBAL_STATE_CODE(); |
| 5787 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5788 | for (i = bs; i != base; i = child_bs(child)) { |
| 5789 | child = bdrv_filter_or_cow_child(i); |
| 5790 | if (child) { |
| 5791 | assert(child->frozen); |
| 5792 | child->frozen = false; |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5793 | } |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5794 | } |
| 5795 | } |
| 5796 | |
| 5797 | /* |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5798 | * Drops images above 'base' up to and including 'top', and sets the image |
| 5799 | * above 'top' to have base as its backing file. |
| 5800 | * |
| 5801 | * Requires that the overlay to 'top' is opened r/w, so that the backing file |
| 5802 | * information in 'bs' can be properly updated. |
| 5803 | * |
| 5804 | * E.g., this will convert the following chain: |
| 5805 | * bottom <- base <- intermediate <- top <- active |
| 5806 | * |
| 5807 | * to |
| 5808 | * |
| 5809 | * bottom <- base <- active |
| 5810 | * |
| 5811 | * It is allowed for bottom==base, in which case it converts: |
| 5812 | * |
| 5813 | * base <- intermediate <- top <- active |
| 5814 | * |
| 5815 | * to |
| 5816 | * |
| 5817 | * base <- active |
| 5818 | * |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 5819 | * If backing_file_str is non-NULL, it will be used when modifying top's |
| 5820 | * overlay image metadata. |
| 5821 | * |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5822 | * Error conditions: |
| 5823 | * if active == top, that is considered an error |
| 5824 | * |
| 5825 | */ |
Kevin Wolf | bde7071 | 2017-06-27 20:36:18 +0200 | [diff] [blame] | 5826 | int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base, |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame^] | 5827 | const char *backing_file_str, |
| 5828 | bool backing_mask_protocol) |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5829 | { |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 5830 | BlockDriverState *explicit_top = top; |
| 5831 | bool update_inherits_from; |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5832 | BdrvChild *c; |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 5833 | Error *local_err = NULL; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5834 | int ret = -EIO; |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5835 | g_autoptr(GSList) updated_children = NULL; |
| 5836 | GSList *p; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5837 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5838 | GLOBAL_STATE_CODE(); |
| 5839 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 5840 | bdrv_ref(top); |
Kevin Wolf | 631086d | 2022-11-18 18:41:03 +0100 | [diff] [blame] | 5841 | bdrv_drained_begin(base); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5842 | bdrv_graph_wrlock(); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 5843 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5844 | if (!top->drv || !base->drv) { |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5845 | goto exit_wrlock; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5846 | } |
| 5847 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 5848 | /* Make sure that base is in the backing chain of top */ |
| 5849 | if (!bdrv_chain_contains(top, base)) { |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5850 | goto exit_wrlock; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5851 | } |
| 5852 | |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 5853 | /* If 'base' recursively inherits from 'top' then we should set |
| 5854 | * base->inherits_from to top->inherits_from after 'top' and all |
| 5855 | * other intermediate nodes have been dropped. |
| 5856 | * If 'top' is an implicit node (e.g. "commit_top") we should skip |
| 5857 | * 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] | 5858 | explicit_top = bdrv_skip_implicit_filters(explicit_top); |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 5859 | update_inherits_from = bdrv_inherits_from_recursive(base, explicit_top); |
| 5860 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5861 | /* success - we can delete the intermediate states, and link top->base */ |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 5862 | if (!backing_file_str) { |
| 5863 | bdrv_refresh_filename(base); |
| 5864 | backing_file_str = base->filename; |
| 5865 | } |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 5866 | |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5867 | QLIST_FOREACH(c, &top->parents, next_parent) { |
| 5868 | updated_children = g_slist_prepend(updated_children, c); |
| 5869 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 5870 | |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5871 | /* |
| 5872 | * It seems correct to pass detach_subchain=true here, but it triggers |
| 5873 | * one more yet not fixed bug, when due to nested aio_poll loop we switch to |
| 5874 | * another drained section, which modify the graph (for example, removing |
| 5875 | * the child, which we keep in updated_children list). So, it's a TODO. |
| 5876 | * |
| 5877 | * Note, bug triggered if pass detach_subchain=true here and run |
| 5878 | * test-bdrv-drain. test_drop_intermediate_poll() test-case will crash. |
| 5879 | * That's a FIXME. |
| 5880 | */ |
| 5881 | bdrv_replace_node_common(top, base, false, false, &local_err); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5882 | bdrv_graph_wrunlock(); |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5883 | |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5884 | if (local_err) { |
| 5885 | error_report_err(local_err); |
| 5886 | goto exit; |
| 5887 | } |
| 5888 | |
| 5889 | for (p = updated_children; p; p = p->next) { |
| 5890 | c = p->data; |
| 5891 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 5892 | if (c->klass->update_filename) { |
| 5893 | ret = c->klass->update_filename(c, base, backing_file_str, |
Peter Krempa | 4b028cb | 2023-12-05 18:14:41 +0100 | [diff] [blame^] | 5894 | backing_mask_protocol, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 5895 | &local_err); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 5896 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5897 | /* |
| 5898 | * TODO: Actually, we want to rollback all previous iterations |
| 5899 | * of this loop, and (which is almost impossible) previous |
| 5900 | * bdrv_replace_node()... |
| 5901 | * |
| 5902 | * Note, that c->klass->update_filename may lead to permission |
| 5903 | * update, so it's a bad idea to call it inside permission |
| 5904 | * update transaction of bdrv_replace_node. |
| 5905 | */ |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 5906 | error_report_err(local_err); |
| 5907 | goto exit; |
| 5908 | } |
| 5909 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 5910 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5911 | |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 5912 | if (update_inherits_from) { |
| 5913 | base->inherits_from = explicit_top->inherits_from; |
| 5914 | } |
| 5915 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5916 | ret = 0; |
Kevin Wolf | 5c0ef49 | 2023-10-27 17:53:24 +0200 | [diff] [blame] | 5917 | goto exit; |
| 5918 | |
| 5919 | exit_wrlock: |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 5920 | bdrv_graph_wrunlock(); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5921 | exit: |
Kevin Wolf | 631086d | 2022-11-18 18:41:03 +0100 | [diff] [blame] | 5922 | bdrv_drained_end(base); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 5923 | bdrv_unref(top); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5924 | return ret; |
| 5925 | } |
| 5926 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 5927 | /** |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5928 | * Implementation of BlockDriver.bdrv_co_get_allocated_file_size() that |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5929 | * sums the size of all data-bearing children. (This excludes backing |
| 5930 | * children.) |
| 5931 | */ |
Emanuele Giuseppe Esposito | de33563 | 2023-05-04 13:57:43 +0200 | [diff] [blame] | 5932 | static int64_t coroutine_fn GRAPH_RDLOCK |
| 5933 | bdrv_sum_allocated_file_size(BlockDriverState *bs) |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5934 | { |
| 5935 | BdrvChild *child; |
| 5936 | int64_t child_size, sum = 0; |
| 5937 | |
| 5938 | QLIST_FOREACH(child, &bs->children, next) { |
| 5939 | if (child->role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA | |
| 5940 | BDRV_CHILD_FILTERED)) |
| 5941 | { |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5942 | child_size = bdrv_co_get_allocated_file_size(child->bs); |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5943 | if (child_size < 0) { |
| 5944 | return child_size; |
| 5945 | } |
| 5946 | sum += child_size; |
| 5947 | } |
| 5948 | } |
| 5949 | |
| 5950 | return sum; |
| 5951 | } |
| 5952 | |
| 5953 | /** |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5954 | * Length of a allocated file in bytes. Sparse files are counted by actual |
| 5955 | * allocated space. Return < 0 if error or unknown. |
| 5956 | */ |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5957 | int64_t coroutine_fn bdrv_co_get_allocated_file_size(BlockDriverState *bs) |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5958 | { |
| 5959 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 5960 | IO_CODE(); |
Emanuele Giuseppe Esposito | de33563 | 2023-05-04 13:57:43 +0200 | [diff] [blame] | 5961 | assert_bdrv_graph_readable(); |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 5962 | |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5963 | if (!drv) { |
| 5964 | return -ENOMEDIUM; |
| 5965 | } |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5966 | if (drv->bdrv_co_get_allocated_file_size) { |
| 5967 | return drv->bdrv_co_get_allocated_file_size(bs); |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5968 | } |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5969 | |
| 5970 | if (drv->bdrv_file_open) { |
| 5971 | /* |
| 5972 | * Protocol drivers default to -ENOTSUP (most of their data is |
| 5973 | * not stored in any of their children (if they even have any), |
| 5974 | * so there is no generic way to figure it out). |
| 5975 | */ |
| 5976 | return -ENOTSUP; |
| 5977 | } else if (drv->is_filter) { |
| 5978 | /* Filter drivers default to the size of their filtered child */ |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5979 | return bdrv_co_get_allocated_file_size(bdrv_filter_bs(bs)); |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5980 | } else { |
| 5981 | /* Other drivers default to summing their children's sizes */ |
| 5982 | return bdrv_sum_allocated_file_size(bs); |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5983 | } |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5984 | } |
| 5985 | |
Stefan Hajnoczi | 90880ff | 2017-07-05 13:57:30 +0100 | [diff] [blame] | 5986 | /* |
| 5987 | * bdrv_measure: |
| 5988 | * @drv: Format driver |
| 5989 | * @opts: Creation options for new image |
| 5990 | * @in_bs: Existing image containing data for new image (may be NULL) |
| 5991 | * @errp: Error object |
| 5992 | * Returns: A #BlockMeasureInfo (free using qapi_free_BlockMeasureInfo()) |
| 5993 | * or NULL on error |
| 5994 | * |
| 5995 | * Calculate file size required to create a new image. |
| 5996 | * |
| 5997 | * If @in_bs is given then space for allocated clusters and zero clusters |
| 5998 | * from that image are included in the calculation. If @opts contains a |
| 5999 | * backing file that is shared by @in_bs then backing clusters may be omitted |
| 6000 | * from the calculation. |
| 6001 | * |
| 6002 | * If @in_bs is NULL then the calculation includes no allocated clusters |
| 6003 | * unless a preallocation option is given in @opts. |
| 6004 | * |
| 6005 | * Note that @in_bs may use a different BlockDriver from @drv. |
| 6006 | * |
| 6007 | * If an error occurs the @errp pointer is set. |
| 6008 | */ |
| 6009 | BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts, |
| 6010 | BlockDriverState *in_bs, Error **errp) |
| 6011 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6012 | IO_CODE(); |
Stefan Hajnoczi | 90880ff | 2017-07-05 13:57:30 +0100 | [diff] [blame] | 6013 | if (!drv->bdrv_measure) { |
| 6014 | error_setg(errp, "Block driver '%s' does not support size measurement", |
| 6015 | drv->format_name); |
| 6016 | return NULL; |
| 6017 | } |
| 6018 | |
| 6019 | return drv->bdrv_measure(opts, in_bs, errp); |
| 6020 | } |
| 6021 | |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 6022 | /** |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6023 | * Return number of sectors on success, -errno on error. |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 6024 | */ |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6025 | int64_t coroutine_fn bdrv_co_nb_sectors(BlockDriverState *bs) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 6026 | { |
| 6027 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6028 | IO_CODE(); |
Kevin Wolf | 8ab8140 | 2023-02-03 16:22:02 +0100 | [diff] [blame] | 6029 | assert_bdrv_graph_readable(); |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6030 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 6031 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6032 | return -ENOMEDIUM; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 6033 | |
Paolo Bonzini | 160a29e | 2023-04-07 17:32:56 +0200 | [diff] [blame] | 6034 | if (bs->bl.has_variable_length) { |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6035 | int ret = bdrv_co_refresh_total_sectors(bs, bs->total_sectors); |
Kevin Wolf | b94a261 | 2013-10-29 12:18:58 +0100 | [diff] [blame] | 6036 | if (ret < 0) { |
| 6037 | return ret; |
Stefan Hajnoczi | 46a4e4e | 2011-03-29 20:04:41 +0100 | [diff] [blame] | 6038 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 6039 | } |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6040 | return bs->total_sectors; |
| 6041 | } |
| 6042 | |
Paolo Bonzini | 81f730d | 2023-04-07 17:33:03 +0200 | [diff] [blame] | 6043 | /* |
| 6044 | * This wrapper is written by hand because this function is in the hot I/O path, |
| 6045 | * via blk_get_geometry. |
| 6046 | */ |
| 6047 | int64_t coroutine_mixed_fn bdrv_nb_sectors(BlockDriverState *bs) |
| 6048 | { |
| 6049 | BlockDriver *drv = bs->drv; |
| 6050 | IO_CODE(); |
| 6051 | |
| 6052 | if (!drv) |
| 6053 | return -ENOMEDIUM; |
| 6054 | |
| 6055 | if (bs->bl.has_variable_length) { |
| 6056 | int ret = bdrv_refresh_total_sectors(bs, bs->total_sectors); |
| 6057 | if (ret < 0) { |
| 6058 | return ret; |
| 6059 | } |
| 6060 | } |
| 6061 | |
| 6062 | return bs->total_sectors; |
| 6063 | } |
| 6064 | |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6065 | /** |
| 6066 | * Return length in bytes on success, -errno on error. |
| 6067 | * The length is always a multiple of BDRV_SECTOR_SIZE. |
| 6068 | */ |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6069 | int64_t coroutine_fn bdrv_co_getlength(BlockDriverState *bs) |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6070 | { |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6071 | int64_t ret; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6072 | IO_CODE(); |
Kevin Wolf | 8ab8140 | 2023-02-03 16:22:02 +0100 | [diff] [blame] | 6073 | assert_bdrv_graph_readable(); |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6074 | |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6075 | ret = bdrv_co_nb_sectors(bs); |
Eric Blake | 122860b | 2020-11-05 09:51:22 -0600 | [diff] [blame] | 6076 | if (ret < 0) { |
| 6077 | return ret; |
| 6078 | } |
| 6079 | if (ret > INT64_MAX / BDRV_SECTOR_SIZE) { |
| 6080 | return -EFBIG; |
| 6081 | } |
| 6082 | return ret * BDRV_SECTOR_SIZE; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 6083 | } |
| 6084 | |
Eric Blake | 5411541 | 2016-06-23 16:37:26 -0600 | [diff] [blame] | 6085 | bool bdrv_is_sg(BlockDriverState *bs) |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 6086 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6087 | IO_CODE(); |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 6088 | return bs->sg; |
| 6089 | } |
| 6090 | |
Max Reitz | ae23f78 | 2019-06-12 22:57:15 +0200 | [diff] [blame] | 6091 | /** |
| 6092 | * Return whether the given node supports compressed writes. |
| 6093 | */ |
| 6094 | bool bdrv_supports_compressed_writes(BlockDriverState *bs) |
| 6095 | { |
| 6096 | BlockDriverState *filtered; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6097 | IO_CODE(); |
Max Reitz | ae23f78 | 2019-06-12 22:57:15 +0200 | [diff] [blame] | 6098 | |
| 6099 | if (!bs->drv || !block_driver_can_compress(bs->drv)) { |
| 6100 | return false; |
| 6101 | } |
| 6102 | |
| 6103 | filtered = bdrv_filter_bs(bs); |
| 6104 | if (filtered) { |
| 6105 | /* |
| 6106 | * Filters can only forward compressed writes, so we have to |
| 6107 | * check the child. |
| 6108 | */ |
| 6109 | return bdrv_supports_compressed_writes(filtered); |
| 6110 | } |
| 6111 | |
| 6112 | return true; |
| 6113 | } |
| 6114 | |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 6115 | const char *bdrv_get_format_name(BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6116 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6117 | IO_CODE(); |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 6118 | return bs->drv ? bs->drv->format_name : NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6119 | } |
| 6120 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6121 | static int qsort_strcmp(const void *a, const void *b) |
| 6122 | { |
Max Reitz | ceff5bd | 2016-10-12 22:49:05 +0200 | [diff] [blame] | 6123 | return strcmp(*(char *const *)a, *(char *const *)b); |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6124 | } |
| 6125 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 6126 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 6127 | void *opaque, bool read_only) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6128 | { |
| 6129 | BlockDriver *drv; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6130 | int count = 0; |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6131 | int i; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6132 | const char **formats = NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6133 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6134 | GLOBAL_STATE_CODE(); |
| 6135 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 6136 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6137 | if (drv->format_name) { |
| 6138 | bool found = false; |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 6139 | |
| 6140 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, read_only)) { |
| 6141 | continue; |
| 6142 | } |
| 6143 | |
Markus Armbruster | fb2575f | 2023-09-21 14:13:11 +0200 | [diff] [blame] | 6144 | i = count; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6145 | while (formats && i && !found) { |
| 6146 | found = !strcmp(formats[--i], drv->format_name); |
| 6147 | } |
| 6148 | |
| 6149 | if (!found) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 6150 | formats = g_renew(const char *, formats, count + 1); |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6151 | formats[count++] = drv->format_name; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6152 | } |
| 6153 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6154 | } |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6155 | |
Max Reitz | eb0df69 | 2016-10-12 22:49:06 +0200 | [diff] [blame] | 6156 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); i++) { |
| 6157 | const char *format_name = block_driver_modules[i].format_name; |
| 6158 | |
| 6159 | if (format_name) { |
| 6160 | bool found = false; |
| 6161 | int j = count; |
| 6162 | |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 6163 | if (use_bdrv_whitelist && |
| 6164 | !bdrv_format_is_whitelisted(format_name, read_only)) { |
| 6165 | continue; |
| 6166 | } |
| 6167 | |
Max Reitz | eb0df69 | 2016-10-12 22:49:06 +0200 | [diff] [blame] | 6168 | while (formats && j && !found) { |
| 6169 | found = !strcmp(formats[--j], format_name); |
| 6170 | } |
| 6171 | |
| 6172 | if (!found) { |
| 6173 | formats = g_renew(const char *, formats, count + 1); |
| 6174 | formats[count++] = format_name; |
| 6175 | } |
| 6176 | } |
| 6177 | } |
| 6178 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6179 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); |
| 6180 | |
| 6181 | for (i = 0; i < count; i++) { |
| 6182 | it(opaque, formats[i]); |
| 6183 | } |
| 6184 | |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6185 | g_free(formats); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6186 | } |
| 6187 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 6188 | /* This function is to find a node in the bs graph */ |
| 6189 | BlockDriverState *bdrv_find_node(const char *node_name) |
| 6190 | { |
| 6191 | BlockDriverState *bs; |
| 6192 | |
| 6193 | assert(node_name); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6194 | GLOBAL_STATE_CODE(); |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 6195 | |
| 6196 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 6197 | if (!strcmp(node_name, bs->node_name)) { |
| 6198 | return bs; |
| 6199 | } |
| 6200 | } |
| 6201 | return NULL; |
| 6202 | } |
| 6203 | |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6204 | /* 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] | 6205 | BlockDeviceInfoList *bdrv_named_nodes_list(bool flat, |
| 6206 | Error **errp) |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6207 | { |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6208 | BlockDeviceInfoList *list; |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6209 | BlockDriverState *bs; |
| 6210 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6211 | GLOBAL_STATE_CODE(); |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 6212 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6213 | |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6214 | list = NULL; |
| 6215 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
Peter Krempa | facda54 | 2020-01-20 09:50:49 +0100 | [diff] [blame] | 6216 | BlockDeviceInfo *info = bdrv_block_device_info(NULL, bs, flat, errp); |
Alberto Garcia | d5a8ee6 | 2015-04-17 14:52:43 +0300 | [diff] [blame] | 6217 | if (!info) { |
| 6218 | qapi_free_BlockDeviceInfoList(list); |
| 6219 | return NULL; |
| 6220 | } |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6221 | QAPI_LIST_PREPEND(list, info); |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6222 | } |
| 6223 | |
| 6224 | return list; |
| 6225 | } |
| 6226 | |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6227 | typedef struct XDbgBlockGraphConstructor { |
| 6228 | XDbgBlockGraph *graph; |
| 6229 | GHashTable *graph_nodes; |
| 6230 | } XDbgBlockGraphConstructor; |
| 6231 | |
| 6232 | static XDbgBlockGraphConstructor *xdbg_graph_new(void) |
| 6233 | { |
| 6234 | XDbgBlockGraphConstructor *gr = g_new(XDbgBlockGraphConstructor, 1); |
| 6235 | |
| 6236 | gr->graph = g_new0(XDbgBlockGraph, 1); |
| 6237 | gr->graph_nodes = g_hash_table_new(NULL, NULL); |
| 6238 | |
| 6239 | return gr; |
| 6240 | } |
| 6241 | |
| 6242 | static XDbgBlockGraph *xdbg_graph_finalize(XDbgBlockGraphConstructor *gr) |
| 6243 | { |
| 6244 | XDbgBlockGraph *graph = gr->graph; |
| 6245 | |
| 6246 | g_hash_table_destroy(gr->graph_nodes); |
| 6247 | g_free(gr); |
| 6248 | |
| 6249 | return graph; |
| 6250 | } |
| 6251 | |
| 6252 | static uintptr_t xdbg_graph_node_num(XDbgBlockGraphConstructor *gr, void *node) |
| 6253 | { |
| 6254 | uintptr_t ret = (uintptr_t)g_hash_table_lookup(gr->graph_nodes, node); |
| 6255 | |
| 6256 | if (ret != 0) { |
| 6257 | return ret; |
| 6258 | } |
| 6259 | |
| 6260 | /* |
| 6261 | * Start counting from 1, not 0, because 0 interferes with not-found (NULL) |
| 6262 | * answer of g_hash_table_lookup. |
| 6263 | */ |
| 6264 | ret = g_hash_table_size(gr->graph_nodes) + 1; |
| 6265 | g_hash_table_insert(gr->graph_nodes, node, (void *)ret); |
| 6266 | |
| 6267 | return ret; |
| 6268 | } |
| 6269 | |
| 6270 | static void xdbg_graph_add_node(XDbgBlockGraphConstructor *gr, void *node, |
| 6271 | XDbgBlockGraphNodeType type, const char *name) |
| 6272 | { |
| 6273 | XDbgBlockGraphNode *n; |
| 6274 | |
| 6275 | n = g_new0(XDbgBlockGraphNode, 1); |
| 6276 | |
| 6277 | n->id = xdbg_graph_node_num(gr, node); |
| 6278 | n->type = type; |
| 6279 | n->name = g_strdup(name); |
| 6280 | |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6281 | QAPI_LIST_PREPEND(gr->graph->nodes, n); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6282 | } |
| 6283 | |
| 6284 | static void xdbg_graph_add_edge(XDbgBlockGraphConstructor *gr, void *parent, |
| 6285 | const BdrvChild *child) |
| 6286 | { |
Max Reitz | cdb1cec | 2019-11-08 13:34:52 +0100 | [diff] [blame] | 6287 | BlockPermission qapi_perm; |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6288 | XDbgBlockGraphEdge *edge; |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 6289 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6290 | |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6291 | edge = g_new0(XDbgBlockGraphEdge, 1); |
| 6292 | |
| 6293 | edge->parent = xdbg_graph_node_num(gr, parent); |
| 6294 | edge->child = xdbg_graph_node_num(gr, child->bs); |
| 6295 | edge->name = g_strdup(child->name); |
| 6296 | |
Max Reitz | cdb1cec | 2019-11-08 13:34:52 +0100 | [diff] [blame] | 6297 | for (qapi_perm = 0; qapi_perm < BLOCK_PERMISSION__MAX; qapi_perm++) { |
| 6298 | uint64_t flag = bdrv_qapi_perm_to_blk_perm(qapi_perm); |
| 6299 | |
| 6300 | if (flag & child->perm) { |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6301 | QAPI_LIST_PREPEND(edge->perm, qapi_perm); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6302 | } |
Max Reitz | cdb1cec | 2019-11-08 13:34:52 +0100 | [diff] [blame] | 6303 | if (flag & child->shared_perm) { |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6304 | QAPI_LIST_PREPEND(edge->shared_perm, qapi_perm); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6305 | } |
| 6306 | } |
| 6307 | |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6308 | QAPI_LIST_PREPEND(gr->graph->edges, edge); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6309 | } |
| 6310 | |
| 6311 | |
| 6312 | XDbgBlockGraph *bdrv_get_xdbg_block_graph(Error **errp) |
| 6313 | { |
| 6314 | BlockBackend *blk; |
| 6315 | BlockJob *job; |
| 6316 | BlockDriverState *bs; |
| 6317 | BdrvChild *child; |
| 6318 | XDbgBlockGraphConstructor *gr = xdbg_graph_new(); |
| 6319 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6320 | GLOBAL_STATE_CODE(); |
| 6321 | |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6322 | for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) { |
| 6323 | char *allocated_name = NULL; |
| 6324 | const char *name = blk_name(blk); |
| 6325 | |
| 6326 | if (!*name) { |
| 6327 | name = allocated_name = blk_get_attached_dev_id(blk); |
| 6328 | } |
| 6329 | xdbg_graph_add_node(gr, blk, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_BACKEND, |
| 6330 | name); |
| 6331 | g_free(allocated_name); |
| 6332 | if (blk_root(blk)) { |
| 6333 | xdbg_graph_add_edge(gr, blk, blk_root(blk)); |
| 6334 | } |
| 6335 | } |
| 6336 | |
Emanuele Giuseppe Esposito | 880eeec | 2022-09-26 05:32:04 -0400 | [diff] [blame] | 6337 | WITH_JOB_LOCK_GUARD() { |
| 6338 | for (job = block_job_next_locked(NULL); job; |
| 6339 | job = block_job_next_locked(job)) { |
| 6340 | GSList *el; |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6341 | |
Emanuele Giuseppe Esposito | 880eeec | 2022-09-26 05:32:04 -0400 | [diff] [blame] | 6342 | xdbg_graph_add_node(gr, job, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_JOB, |
| 6343 | job->job.id); |
| 6344 | for (el = job->nodes; el; el = el->next) { |
| 6345 | xdbg_graph_add_edge(gr, job, (BdrvChild *)el->data); |
| 6346 | } |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6347 | } |
| 6348 | } |
| 6349 | |
| 6350 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 6351 | xdbg_graph_add_node(gr, bs, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_DRIVER, |
| 6352 | bs->node_name); |
| 6353 | QLIST_FOREACH(child, &bs->children, next) { |
| 6354 | xdbg_graph_add_edge(gr, bs, child); |
| 6355 | } |
| 6356 | } |
| 6357 | |
| 6358 | return xdbg_graph_finalize(gr); |
| 6359 | } |
| 6360 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6361 | BlockDriverState *bdrv_lookup_bs(const char *device, |
| 6362 | const char *node_name, |
| 6363 | Error **errp) |
| 6364 | { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 6365 | BlockBackend *blk; |
| 6366 | BlockDriverState *bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6367 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6368 | GLOBAL_STATE_CODE(); |
| 6369 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6370 | if (device) { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 6371 | blk = blk_by_name(device); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6372 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 6373 | if (blk) { |
Alberto Garcia | 9f4ed6f | 2015-10-26 16:46:49 +0200 | [diff] [blame] | 6374 | bs = blk_bs(blk); |
| 6375 | if (!bs) { |
Max Reitz | 5433c24 | 2015-10-19 17:53:29 +0200 | [diff] [blame] | 6376 | error_setg(errp, "Device '%s' has no medium", device); |
Max Reitz | 5433c24 | 2015-10-19 17:53:29 +0200 | [diff] [blame] | 6377 | } |
| 6378 | |
Alberto Garcia | 9f4ed6f | 2015-10-26 16:46:49 +0200 | [diff] [blame] | 6379 | return bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6380 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6381 | } |
| 6382 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 6383 | if (node_name) { |
| 6384 | bs = bdrv_find_node(node_name); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6385 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 6386 | if (bs) { |
| 6387 | return bs; |
| 6388 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6389 | } |
| 6390 | |
Connor Kuehl | 785ec4b | 2021-03-05 09:19:28 -0600 | [diff] [blame] | 6391 | error_setg(errp, "Cannot find device=\'%s\' nor node-name=\'%s\'", |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 6392 | device ? device : "", |
| 6393 | node_name ? node_name : ""); |
| 6394 | return NULL; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6395 | } |
| 6396 | |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 6397 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
| 6398 | * return false. If either argument is NULL, return false. */ |
| 6399 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) |
| 6400 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6401 | |
| 6402 | GLOBAL_STATE_CODE(); |
| 6403 | |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 6404 | while (top && top != base) { |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6405 | top = bdrv_filter_or_cow_bs(top); |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 6406 | } |
| 6407 | |
| 6408 | return top != NULL; |
| 6409 | } |
| 6410 | |
Fam Zheng | 04df765 | 2014-10-31 11:32:54 +0800 | [diff] [blame] | 6411 | BlockDriverState *bdrv_next_node(BlockDriverState *bs) |
| 6412 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6413 | GLOBAL_STATE_CODE(); |
Fam Zheng | 04df765 | 2014-10-31 11:32:54 +0800 | [diff] [blame] | 6414 | if (!bs) { |
| 6415 | return QTAILQ_FIRST(&graph_bdrv_states); |
| 6416 | } |
| 6417 | return QTAILQ_NEXT(bs, node_list); |
| 6418 | } |
| 6419 | |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 6420 | BlockDriverState *bdrv_next_all_states(BlockDriverState *bs) |
| 6421 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6422 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 6423 | if (!bs) { |
| 6424 | return QTAILQ_FIRST(&all_bdrv_states); |
| 6425 | } |
| 6426 | return QTAILQ_NEXT(bs, bs_list); |
| 6427 | } |
| 6428 | |
Fam Zheng | 20a9e77 | 2014-10-31 11:32:55 +0800 | [diff] [blame] | 6429 | const char *bdrv_get_node_name(const BlockDriverState *bs) |
| 6430 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6431 | IO_CODE(); |
Fam Zheng | 20a9e77 | 2014-10-31 11:32:55 +0800 | [diff] [blame] | 6432 | return bs->node_name; |
| 6433 | } |
| 6434 | |
Kevin Wolf | 1f0c461 | 2016-03-22 18:38:44 +0100 | [diff] [blame] | 6435 | const char *bdrv_get_parent_name(const BlockDriverState *bs) |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6436 | { |
| 6437 | BdrvChild *c; |
| 6438 | const char *name; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 6439 | IO_CODE(); |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6440 | |
| 6441 | /* If multiple parents have a name, just pick the first one. */ |
| 6442 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 6443 | if (c->klass->get_name) { |
| 6444 | name = c->klass->get_name(c); |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6445 | if (name && *name) { |
| 6446 | return name; |
| 6447 | } |
| 6448 | } |
| 6449 | } |
| 6450 | |
| 6451 | return NULL; |
| 6452 | } |
| 6453 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 6454 | /* TODO check what callers really want: bs->node_name or blk_name() */ |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 6455 | const char *bdrv_get_device_name(const BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6456 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6457 | IO_CODE(); |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6458 | return bdrv_get_parent_name(bs) ?: ""; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6459 | } |
| 6460 | |
Alberto Garcia | 9b2aa84 | 2015-04-08 12:29:18 +0300 | [diff] [blame] | 6461 | /* This can be used to identify nodes that might not have a device |
| 6462 | * name associated. Since node and device names live in the same |
| 6463 | * namespace, the result is unambiguous. The exception is if both are |
| 6464 | * absent, then this returns an empty (non-null) string. */ |
| 6465 | const char *bdrv_get_device_or_node_name(const BlockDriverState *bs) |
| 6466 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6467 | IO_CODE(); |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6468 | return bdrv_get_parent_name(bs) ?: bs->node_name; |
Alberto Garcia | 9b2aa84 | 2015-04-08 12:29:18 +0300 | [diff] [blame] | 6469 | } |
| 6470 | |
Markus Armbruster | c843328 | 2012-06-05 16:49:24 +0200 | [diff] [blame] | 6471 | int bdrv_get_flags(BlockDriverState *bs) |
| 6472 | { |
Hanna Reitz | 15aee7a | 2022-04-27 13:40:54 +0200 | [diff] [blame] | 6473 | IO_CODE(); |
Markus Armbruster | c843328 | 2012-06-05 16:49:24 +0200 | [diff] [blame] | 6474 | return bs->open_flags; |
| 6475 | } |
| 6476 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 6477 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
| 6478 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6479 | GLOBAL_STATE_CODE(); |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 6480 | return 1; |
| 6481 | } |
| 6482 | |
Kevin Wolf | 0671798 | 2023-10-27 17:53:11 +0200 | [diff] [blame] | 6483 | int coroutine_mixed_fn bdrv_has_zero_init(BlockDriverState *bs) |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6484 | { |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 6485 | BlockDriverState *filtered; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6486 | GLOBAL_STATE_CODE(); |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 6487 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 6488 | if (!bs->drv) { |
| 6489 | return 0; |
| 6490 | } |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6491 | |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 6492 | /* If BS is a copy on write image, it is initialized to |
| 6493 | the contents of the base image, which may not be zeroes. */ |
Max Reitz | 3477817 | 2019-06-12 17:10:46 +0200 | [diff] [blame] | 6494 | if (bdrv_cow_child(bs)) { |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 6495 | return 0; |
| 6496 | } |
Kevin Wolf | 336c1c1 | 2010-07-28 11:26:29 +0200 | [diff] [blame] | 6497 | if (bs->drv->bdrv_has_zero_init) { |
| 6498 | return bs->drv->bdrv_has_zero_init(bs); |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6499 | } |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 6500 | |
| 6501 | filtered = bdrv_filter_bs(bs); |
| 6502 | if (filtered) { |
| 6503 | return bdrv_has_zero_init(filtered); |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6504 | } |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6505 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 6506 | /* safe default */ |
| 6507 | return 0; |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6508 | } |
| 6509 | |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 6510 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) |
| 6511 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6512 | IO_CODE(); |
Denis V. Lunev | 2f0342e | 2016-07-14 16:33:26 +0300 | [diff] [blame] | 6513 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 6514 | return false; |
| 6515 | } |
| 6516 | |
Eric Blake | e24d813 | 2018-01-26 13:34:39 -0600 | [diff] [blame] | 6517 | return bs->supported_zero_flags & BDRV_REQ_MAY_UNMAP; |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 6518 | } |
| 6519 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 6520 | void bdrv_get_backing_filename(BlockDriverState *bs, |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 6521 | char *filename, int filename_size) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6522 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6523 | IO_CODE(); |
Kevin Wolf | 3574c60 | 2011-10-26 11:02:11 +0200 | [diff] [blame] | 6524 | pstrcpy(filename, filename_size, bs->backing_file); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6525 | } |
| 6526 | |
Emanuele Giuseppe Esposito | 3d47eb0 | 2023-01-13 21:42:08 +0100 | [diff] [blame] | 6527 | int coroutine_fn bdrv_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6528 | { |
Vladimir Sementsov-Ogievskiy | 8b11700 | 2020-12-04 01:27:13 +0300 | [diff] [blame] | 6529 | int ret; |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6530 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6531 | IO_CODE(); |
Emanuele Giuseppe Esposito | a00e70c | 2023-05-04 13:57:44 +0200 | [diff] [blame] | 6532 | assert_bdrv_graph_readable(); |
| 6533 | |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6534 | /* if bs->drv == NULL, bs is closed, so there's nothing to do here */ |
| 6535 | if (!drv) { |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6536 | return -ENOMEDIUM; |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6537 | } |
Emanuele Giuseppe Esposito | 3d47eb0 | 2023-01-13 21:42:08 +0100 | [diff] [blame] | 6538 | if (!drv->bdrv_co_get_info) { |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 6539 | BlockDriverState *filtered = bdrv_filter_bs(bs); |
| 6540 | if (filtered) { |
Emanuele Giuseppe Esposito | 3d47eb0 | 2023-01-13 21:42:08 +0100 | [diff] [blame] | 6541 | return bdrv_co_get_info(filtered, bdi); |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6542 | } |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6543 | return -ENOTSUP; |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6544 | } |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6545 | memset(bdi, 0, sizeof(*bdi)); |
Emanuele Giuseppe Esposito | 3d47eb0 | 2023-01-13 21:42:08 +0100 | [diff] [blame] | 6546 | ret = drv->bdrv_co_get_info(bs, bdi); |
Andrey Drobyshev | c54483b | 2023-07-11 20:25:51 +0300 | [diff] [blame] | 6547 | if (bdi->subcluster_size == 0) { |
| 6548 | /* |
| 6549 | * If the driver left this unset, subclusters are not supported. |
| 6550 | * Then it is safe to treat each cluster as having only one subcluster. |
| 6551 | */ |
| 6552 | bdi->subcluster_size = bdi->cluster_size; |
| 6553 | } |
Vladimir Sementsov-Ogievskiy | 8b11700 | 2020-12-04 01:27:13 +0300 | [diff] [blame] | 6554 | if (ret < 0) { |
| 6555 | return ret; |
| 6556 | } |
| 6557 | |
| 6558 | if (bdi->cluster_size > BDRV_MAX_ALIGNMENT) { |
| 6559 | return -EINVAL; |
| 6560 | } |
| 6561 | |
| 6562 | return 0; |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6563 | } |
| 6564 | |
Andrey Shinkevich | 1bf6e9c | 2019-02-08 18:06:06 +0300 | [diff] [blame] | 6565 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs, |
| 6566 | Error **errp) |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 6567 | { |
| 6568 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6569 | IO_CODE(); |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 6570 | if (drv && drv->bdrv_get_specific_info) { |
Andrey Shinkevich | 1bf6e9c | 2019-02-08 18:06:06 +0300 | [diff] [blame] | 6571 | return drv->bdrv_get_specific_info(bs, errp); |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 6572 | } |
| 6573 | return NULL; |
| 6574 | } |
| 6575 | |
Anton Nefedov | d924559 | 2019-09-23 15:17:37 +0300 | [diff] [blame] | 6576 | BlockStatsSpecific *bdrv_get_specific_stats(BlockDriverState *bs) |
| 6577 | { |
| 6578 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6579 | IO_CODE(); |
Anton Nefedov | d924559 | 2019-09-23 15:17:37 +0300 | [diff] [blame] | 6580 | if (!drv || !drv->bdrv_get_specific_stats) { |
| 6581 | return NULL; |
| 6582 | } |
| 6583 | return drv->bdrv_get_specific_stats(bs); |
| 6584 | } |
| 6585 | |
Emanuele Giuseppe Esposito | c834dc0 | 2023-01-13 21:42:11 +0100 | [diff] [blame] | 6586 | void coroutine_fn bdrv_co_debug_event(BlockDriverState *bs, BlkdebugEvent event) |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 6587 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6588 | IO_CODE(); |
Emanuele Giuseppe Esposito | cb2bfaa | 2023-05-04 13:57:45 +0200 | [diff] [blame] | 6589 | assert_bdrv_graph_readable(); |
| 6590 | |
Emanuele Giuseppe Esposito | c834dc0 | 2023-01-13 21:42:11 +0100 | [diff] [blame] | 6591 | if (!bs || !bs->drv || !bs->drv->bdrv_co_debug_event) { |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 6592 | return; |
| 6593 | } |
| 6594 | |
Emanuele Giuseppe Esposito | c834dc0 | 2023-01-13 21:42:11 +0100 | [diff] [blame] | 6595 | bs->drv->bdrv_co_debug_event(bs, event); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6596 | } |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 6597 | |
Kevin Wolf | c0fc512 | 2023-09-29 16:51:46 +0200 | [diff] [blame] | 6598 | static BlockDriverState * GRAPH_RDLOCK |
| 6599 | bdrv_find_debug_node(BlockDriverState *bs) |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6600 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 6601 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6602 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { |
Max Reitz | f706a92 | 2019-06-12 17:42:13 +0200 | [diff] [blame] | 6603 | bs = bdrv_primary_bs(bs); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6604 | } |
| 6605 | |
| 6606 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { |
Vladimir Sementsov-Ogievskiy | d10529a | 2019-09-20 17:20:49 +0300 | [diff] [blame] | 6607 | assert(bs->drv->bdrv_debug_remove_breakpoint); |
| 6608 | return bs; |
| 6609 | } |
| 6610 | |
| 6611 | return NULL; |
| 6612 | } |
| 6613 | |
| 6614 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
| 6615 | const char *tag) |
| 6616 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6617 | GLOBAL_STATE_CODE(); |
Kevin Wolf | c0fc512 | 2023-09-29 16:51:46 +0200 | [diff] [blame] | 6618 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 6619 | |
Vladimir Sementsov-Ogievskiy | d10529a | 2019-09-20 17:20:49 +0300 | [diff] [blame] | 6620 | bs = bdrv_find_debug_node(bs); |
| 6621 | if (bs) { |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6622 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); |
| 6623 | } |
| 6624 | |
| 6625 | return -ENOTSUP; |
| 6626 | } |
| 6627 | |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 6628 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
| 6629 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6630 | GLOBAL_STATE_CODE(); |
Kevin Wolf | c0fc512 | 2023-09-29 16:51:46 +0200 | [diff] [blame] | 6631 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 6632 | |
Vladimir Sementsov-Ogievskiy | d10529a | 2019-09-20 17:20:49 +0300 | [diff] [blame] | 6633 | bs = bdrv_find_debug_node(bs); |
| 6634 | if (bs) { |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 6635 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); |
| 6636 | } |
| 6637 | |
| 6638 | return -ENOTSUP; |
| 6639 | } |
| 6640 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6641 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
| 6642 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6643 | GLOBAL_STATE_CODE(); |
Kevin Wolf | c0fc512 | 2023-09-29 16:51:46 +0200 | [diff] [blame] | 6644 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 6645 | |
Max Reitz | 938789e | 2014-03-10 23:44:08 +0100 | [diff] [blame] | 6646 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
Max Reitz | f706a92 | 2019-06-12 17:42:13 +0200 | [diff] [blame] | 6647 | bs = bdrv_primary_bs(bs); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6648 | } |
| 6649 | |
| 6650 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
| 6651 | return bs->drv->bdrv_debug_resume(bs, tag); |
| 6652 | } |
| 6653 | |
| 6654 | return -ENOTSUP; |
| 6655 | } |
| 6656 | |
| 6657 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) |
| 6658 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6659 | GLOBAL_STATE_CODE(); |
Kevin Wolf | c0fc512 | 2023-09-29 16:51:46 +0200 | [diff] [blame] | 6660 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 6661 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6662 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { |
Max Reitz | f706a92 | 2019-06-12 17:42:13 +0200 | [diff] [blame] | 6663 | bs = bdrv_primary_bs(bs); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6664 | } |
| 6665 | |
| 6666 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { |
| 6667 | return bs->drv->bdrv_debug_is_suspended(bs, tag); |
| 6668 | } |
| 6669 | |
| 6670 | return false; |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 6671 | } |
| 6672 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6673 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
| 6674 | * relative, it must be relative to the chain. So, passing in bs->filename |
| 6675 | * from a BDS as backing_file should not be done, as that may be relative to |
| 6676 | * the CWD rather than the chain. */ |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6677 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
| 6678 | const char *backing_file) |
| 6679 | { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6680 | char *filename_full = NULL; |
| 6681 | char *backing_file_full = NULL; |
| 6682 | char *filename_tmp = NULL; |
| 6683 | int is_protocol = 0; |
Max Reitz | 0b877d0 | 2018-08-01 20:34:11 +0200 | [diff] [blame] | 6684 | bool filenames_refreshed = false; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6685 | BlockDriverState *curr_bs = NULL; |
| 6686 | BlockDriverState *retval = NULL; |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6687 | BlockDriverState *bs_below; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6688 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6689 | GLOBAL_STATE_CODE(); |
Kevin Wolf | b7cfc7d | 2023-09-29 16:51:45 +0200 | [diff] [blame] | 6690 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6691 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6692 | if (!bs || !bs->drv || !backing_file) { |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6693 | return NULL; |
| 6694 | } |
| 6695 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6696 | filename_full = g_malloc(PATH_MAX); |
| 6697 | backing_file_full = g_malloc(PATH_MAX); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6698 | |
| 6699 | is_protocol = path_has_protocol(backing_file); |
| 6700 | |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6701 | /* |
| 6702 | * Being largely a legacy function, skip any filters here |
| 6703 | * (because filters do not have normal filenames, so they cannot |
| 6704 | * match anyway; and allowing json:{} filenames is a bit out of |
| 6705 | * scope). |
| 6706 | */ |
| 6707 | for (curr_bs = bdrv_skip_filters(bs); |
| 6708 | bdrv_cow_child(curr_bs) != NULL; |
| 6709 | curr_bs = bs_below) |
| 6710 | { |
| 6711 | bs_below = bdrv_backing_chain_next(curr_bs); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6712 | |
Max Reitz | 0b877d0 | 2018-08-01 20:34:11 +0200 | [diff] [blame] | 6713 | if (bdrv_backing_overridden(curr_bs)) { |
| 6714 | /* |
| 6715 | * If the backing file was overridden, we can only compare |
| 6716 | * directly against the backing node's filename. |
| 6717 | */ |
| 6718 | |
| 6719 | if (!filenames_refreshed) { |
| 6720 | /* |
| 6721 | * This will automatically refresh all of the |
| 6722 | * filenames in the rest of the backing chain, so we |
| 6723 | * only need to do this once. |
| 6724 | */ |
| 6725 | bdrv_refresh_filename(bs_below); |
| 6726 | filenames_refreshed = true; |
| 6727 | } |
| 6728 | |
| 6729 | if (strcmp(backing_file, bs_below->filename) == 0) { |
| 6730 | retval = bs_below; |
| 6731 | break; |
| 6732 | } |
| 6733 | } else if (is_protocol || path_has_protocol(curr_bs->backing_file)) { |
| 6734 | /* |
| 6735 | * If either of the filename paths is actually a protocol, then |
| 6736 | * compare unmodified paths; otherwise make paths relative. |
| 6737 | */ |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 6738 | char *backing_file_full_ret; |
| 6739 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6740 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6741 | retval = bs_below; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6742 | break; |
| 6743 | } |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 6744 | /* Also check against the full backing filename for the image */ |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 6745 | backing_file_full_ret = bdrv_get_full_backing_filename(curr_bs, |
| 6746 | NULL); |
| 6747 | if (backing_file_full_ret) { |
| 6748 | bool equal = strcmp(backing_file, backing_file_full_ret) == 0; |
| 6749 | g_free(backing_file_full_ret); |
| 6750 | if (equal) { |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6751 | retval = bs_below; |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 6752 | break; |
| 6753 | } |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 6754 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6755 | } else { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6756 | /* If not an absolute filename path, make it relative to the current |
| 6757 | * image's filename path */ |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 6758 | filename_tmp = bdrv_make_absolute_filename(curr_bs, backing_file, |
| 6759 | NULL); |
| 6760 | /* We are going to compare canonicalized absolute pathnames */ |
| 6761 | if (!filename_tmp || !realpath(filename_tmp, filename_full)) { |
| 6762 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6763 | continue; |
| 6764 | } |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 6765 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6766 | |
| 6767 | /* We need to make sure the backing filename we are comparing against |
| 6768 | * is relative to the current image filename (or absolute) */ |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 6769 | filename_tmp = bdrv_get_full_backing_filename(curr_bs, NULL); |
| 6770 | if (!filename_tmp || !realpath(filename_tmp, backing_file_full)) { |
| 6771 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6772 | continue; |
| 6773 | } |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 6774 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6775 | |
| 6776 | if (strcmp(backing_file_full, filename_full) == 0) { |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6777 | retval = bs_below; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6778 | break; |
| 6779 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6780 | } |
| 6781 | } |
| 6782 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6783 | g_free(filename_full); |
| 6784 | g_free(backing_file_full); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6785 | return retval; |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6786 | } |
| 6787 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6788 | void bdrv_init(void) |
| 6789 | { |
Kevin Wolf | e5f05f8 | 2021-07-09 18:41:41 +0200 | [diff] [blame] | 6790 | #ifdef CONFIG_BDRV_WHITELIST_TOOLS |
| 6791 | use_bdrv_whitelist = 1; |
| 6792 | #endif |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 6793 | module_call_init(MODULE_INIT_BLOCK); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6794 | } |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 6795 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 6796 | void bdrv_init_with_whitelist(void) |
| 6797 | { |
| 6798 | use_bdrv_whitelist = 1; |
| 6799 | bdrv_init(); |
| 6800 | } |
| 6801 | |
Emanuele Giuseppe Esposito | a94750d | 2022-02-09 05:54:50 -0500 | [diff] [blame] | 6802 | int bdrv_activate(BlockDriverState *bs, Error **errp) |
| 6803 | { |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6804 | BdrvChild *child, *parent; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6805 | Error *local_err = NULL; |
| 6806 | int ret; |
Vladimir Sementsov-Ogievskiy | 9c98f14 | 2018-10-29 16:23:17 -0400 | [diff] [blame] | 6807 | BdrvDirtyBitmap *bm; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6808 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6809 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 3804e3c | 2023-09-11 11:46:12 +0200 | [diff] [blame] | 6810 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6811 | |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 6812 | if (!bs->drv) { |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6813 | return -ENOMEDIUM; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6814 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 6815 | |
Vladimir Sementsov-Ogievskiy | 16e977d | 2017-01-31 14:23:08 +0300 | [diff] [blame] | 6816 | QLIST_FOREACH(child, &bs->children, next) { |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6817 | bdrv_activate(child->bs, &local_err); |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6818 | if (local_err) { |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6819 | error_propagate(errp, local_err); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6820 | return -EINVAL; |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6821 | } |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6822 | } |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6823 | |
Kevin Wolf | dafe096 | 2017-11-16 13:00:01 +0100 | [diff] [blame] | 6824 | /* |
| 6825 | * Update permissions, they may differ for inactive nodes. |
| 6826 | * |
| 6827 | * Note that the required permissions of inactive images are always a |
| 6828 | * subset of the permissions required after activating the image. This |
| 6829 | * allows us to just get the permissions upfront without restricting |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6830 | * bdrv_co_invalidate_cache(). |
Kevin Wolf | dafe096 | 2017-11-16 13:00:01 +0100 | [diff] [blame] | 6831 | * |
| 6832 | * It also means that in error cases, we don't have to try and revert to |
| 6833 | * the old permissions (which is an operation that could fail, too). We can |
| 6834 | * just keep the extended permissions for the next time that an activation |
| 6835 | * of the image is tried. |
| 6836 | */ |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6837 | if (bs->open_flags & BDRV_O_INACTIVE) { |
| 6838 | bs->open_flags &= ~BDRV_O_INACTIVE; |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 6839 | ret = bdrv_refresh_perms(bs, NULL, errp); |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6840 | if (ret < 0) { |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6841 | bs->open_flags |= BDRV_O_INACTIVE; |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6842 | return ret; |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6843 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 6844 | |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6845 | ret = bdrv_invalidate_cache(bs, errp); |
| 6846 | if (ret < 0) { |
| 6847 | bs->open_flags |= BDRV_O_INACTIVE; |
| 6848 | return ret; |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6849 | } |
Vladimir Sementsov-Ogievskiy | 9c98f14 | 2018-10-29 16:23:17 -0400 | [diff] [blame] | 6850 | |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6851 | FOR_EACH_DIRTY_BITMAP(bs, bm) { |
| 6852 | bdrv_dirty_bitmap_skip_store(bm, false); |
| 6853 | } |
| 6854 | |
Emanuele Giuseppe Esposito | c057960 | 2023-01-13 21:42:03 +0100 | [diff] [blame] | 6855 | ret = bdrv_refresh_total_sectors(bs, bs->total_sectors); |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6856 | if (ret < 0) { |
| 6857 | bs->open_flags |= BDRV_O_INACTIVE; |
| 6858 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6859 | return ret; |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6860 | } |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6861 | } |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6862 | |
| 6863 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 6864 | if (parent->klass->activate) { |
| 6865 | parent->klass->activate(parent, &local_err); |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6866 | if (local_err) { |
Kevin Wolf | 78fc3b3 | 2019-01-31 15:16:10 +0100 | [diff] [blame] | 6867 | bs->open_flags |= BDRV_O_INACTIVE; |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6868 | error_propagate(errp, local_err); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6869 | return -EINVAL; |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6870 | } |
| 6871 | } |
| 6872 | } |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6873 | |
| 6874 | return 0; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6875 | } |
| 6876 | |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6877 | int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp) |
| 6878 | { |
| 6879 | Error *local_err = NULL; |
Emanuele Giuseppe Esposito | 1581a70 | 2022-03-03 10:16:09 -0500 | [diff] [blame] | 6880 | IO_CODE(); |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6881 | |
| 6882 | assert(!(bs->open_flags & BDRV_O_INACTIVE)); |
Kevin Wolf | 1b3ff9f | 2022-12-07 14:18:38 +0100 | [diff] [blame] | 6883 | assert_bdrv_graph_readable(); |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6884 | |
| 6885 | if (bs->drv->bdrv_co_invalidate_cache) { |
| 6886 | bs->drv->bdrv_co_invalidate_cache(bs, &local_err); |
| 6887 | if (local_err) { |
| 6888 | error_propagate(errp, local_err); |
| 6889 | return -EINVAL; |
| 6890 | } |
| 6891 | } |
| 6892 | |
| 6893 | return 0; |
| 6894 | } |
| 6895 | |
Emanuele Giuseppe Esposito | 3b71719 | 2022-02-09 05:54:51 -0500 | [diff] [blame] | 6896 | void bdrv_activate_all(Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6897 | { |
Kevin Wolf | 7c8eece | 2016-03-22 18:58:50 +0100 | [diff] [blame] | 6898 | BlockDriverState *bs; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 6899 | BdrvNextIterator it; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6900 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6901 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 2b3912f | 2023-09-29 16:51:39 +0200 | [diff] [blame] | 6902 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6903 | |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 6904 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6905 | int ret; |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 6906 | |
Emanuele Giuseppe Esposito | a94750d | 2022-02-09 05:54:50 -0500 | [diff] [blame] | 6907 | ret = bdrv_activate(bs, errp); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6908 | if (ret < 0) { |
Max Reitz | 5e003f1 | 2017-11-10 18:25:45 +0100 | [diff] [blame] | 6909 | bdrv_next_cleanup(&it); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6910 | return; |
| 6911 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6912 | } |
| 6913 | } |
| 6914 | |
Kevin Wolf | 0e6bad1 | 2023-09-29 16:51:38 +0200 | [diff] [blame] | 6915 | static bool GRAPH_RDLOCK |
| 6916 | bdrv_has_bds_parent(BlockDriverState *bs, bool only_active) |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6917 | { |
| 6918 | BdrvChild *parent; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 6919 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6920 | |
| 6921 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 6922 | if (parent->klass->parent_is_bds) { |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6923 | BlockDriverState *parent_bs = parent->opaque; |
| 6924 | if (!only_active || !(parent_bs->open_flags & BDRV_O_INACTIVE)) { |
| 6925 | return true; |
| 6926 | } |
| 6927 | } |
| 6928 | } |
| 6929 | |
| 6930 | return false; |
| 6931 | } |
| 6932 | |
Kevin Wolf | 0e6bad1 | 2023-09-29 16:51:38 +0200 | [diff] [blame] | 6933 | static int GRAPH_RDLOCK bdrv_inactivate_recurse(BlockDriverState *bs) |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6934 | { |
Kevin Wolf | cfa1a57 | 2017-05-04 18:52:38 +0200 | [diff] [blame] | 6935 | BdrvChild *child, *parent; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6936 | int ret; |
Vladimir Sementsov-Ogievskiy | a13de40 | 2021-09-11 15:00:27 +0300 | [diff] [blame] | 6937 | uint64_t cumulative_perms, cumulative_shared_perms; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6938 | |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 6939 | GLOBAL_STATE_CODE(); |
| 6940 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 6941 | if (!bs->drv) { |
| 6942 | return -ENOMEDIUM; |
| 6943 | } |
| 6944 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6945 | /* Make sure that we don't inactivate a child before its parent. |
| 6946 | * It will be covered by recursion from the yet active parent. */ |
| 6947 | if (bdrv_has_bds_parent(bs, true)) { |
| 6948 | return 0; |
| 6949 | } |
| 6950 | |
| 6951 | assert(!(bs->open_flags & BDRV_O_INACTIVE)); |
| 6952 | |
| 6953 | /* Inactivate this node */ |
| 6954 | if (bs->drv->bdrv_inactivate) { |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6955 | ret = bs->drv->bdrv_inactivate(bs); |
| 6956 | if (ret < 0) { |
| 6957 | return ret; |
| 6958 | } |
| 6959 | } |
| 6960 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6961 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 6962 | if (parent->klass->inactivate) { |
| 6963 | ret = parent->klass->inactivate(parent); |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6964 | if (ret < 0) { |
| 6965 | return ret; |
Kevin Wolf | cfa1a57 | 2017-05-04 18:52:38 +0200 | [diff] [blame] | 6966 | } |
| 6967 | } |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 6968 | } |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 6969 | |
Vladimir Sementsov-Ogievskiy | a13de40 | 2021-09-11 15:00:27 +0300 | [diff] [blame] | 6970 | bdrv_get_cumulative_perm(bs, &cumulative_perms, |
| 6971 | &cumulative_shared_perms); |
| 6972 | if (cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) { |
| 6973 | /* Our inactive parents still need write access. Inactivation failed. */ |
| 6974 | return -EPERM; |
| 6975 | } |
| 6976 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6977 | bs->open_flags |= BDRV_O_INACTIVE; |
| 6978 | |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 6979 | /* |
| 6980 | * Update permissions, they may differ for inactive nodes. |
| 6981 | * We only tried to loosen restrictions, so errors are not fatal, ignore |
| 6982 | * them. |
| 6983 | */ |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 6984 | bdrv_refresh_perms(bs, NULL, NULL); |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6985 | |
| 6986 | /* Recursively inactivate children */ |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 6987 | QLIST_FOREACH(child, &bs->children, next) { |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6988 | ret = bdrv_inactivate_recurse(child->bs); |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 6989 | if (ret < 0) { |
| 6990 | return ret; |
| 6991 | } |
| 6992 | } |
| 6993 | |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6994 | return 0; |
| 6995 | } |
| 6996 | |
| 6997 | int bdrv_inactivate_all(void) |
| 6998 | { |
Max Reitz | 79720af | 2016-03-16 19:54:44 +0100 | [diff] [blame] | 6999 | BlockDriverState *bs = NULL; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 7000 | BdrvNextIterator it; |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 7001 | int ret = 0; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 7002 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7003 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 0e6bad1 | 2023-09-29 16:51:38 +0200 | [diff] [blame] | 7004 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7005 | |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 7006 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 7007 | /* Nodes with BDS parents are covered by recursion from the last |
| 7008 | * parent that gets inactivated. Don't inactivate them a second |
| 7009 | * time if that has already happened. */ |
| 7010 | if (bdrv_has_bds_parent(bs, false)) { |
| 7011 | continue; |
| 7012 | } |
| 7013 | ret = bdrv_inactivate_recurse(bs); |
| 7014 | if (ret < 0) { |
| 7015 | bdrv_next_cleanup(&it); |
Stefan Hajnoczi | b49f475 | 2023-12-05 13:20:03 -0500 | [diff] [blame] | 7016 | break; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 7017 | } |
| 7018 | } |
| 7019 | |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 7020 | return ret; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 7021 | } |
| 7022 | |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 7023 | /**************************************************************/ |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7024 | /* removable device support */ |
| 7025 | |
| 7026 | /** |
| 7027 | * Return TRUE if the media is present |
| 7028 | */ |
Emanuele Giuseppe Esposito | 1e97be9 | 2023-01-13 21:42:02 +0100 | [diff] [blame] | 7029 | bool coroutine_fn bdrv_co_is_inserted(BlockDriverState *bs) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7030 | { |
| 7031 | BlockDriver *drv = bs->drv; |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 7032 | BdrvChild *child; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7033 | IO_CODE(); |
Emanuele Giuseppe Esposito | c73ff92 | 2023-02-03 16:21:57 +0100 | [diff] [blame] | 7034 | assert_bdrv_graph_readable(); |
Markus Armbruster | a1aff5b | 2011-09-06 18:58:41 +0200 | [diff] [blame] | 7035 | |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 7036 | if (!drv) { |
| 7037 | return false; |
| 7038 | } |
Emanuele Giuseppe Esposito | 1e97be9 | 2023-01-13 21:42:02 +0100 | [diff] [blame] | 7039 | if (drv->bdrv_co_is_inserted) { |
| 7040 | return drv->bdrv_co_is_inserted(bs); |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 7041 | } |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 7042 | QLIST_FOREACH(child, &bs->children, next) { |
Emanuele Giuseppe Esposito | 1e97be9 | 2023-01-13 21:42:02 +0100 | [diff] [blame] | 7043 | if (!bdrv_co_is_inserted(child->bs)) { |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 7044 | return false; |
| 7045 | } |
| 7046 | } |
| 7047 | return true; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7048 | } |
| 7049 | |
| 7050 | /** |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7051 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray |
| 7052 | */ |
Emanuele Giuseppe Esposito | 2531b39 | 2023-01-13 21:42:09 +0100 | [diff] [blame] | 7053 | void coroutine_fn bdrv_co_eject(BlockDriverState *bs, bool eject_flag) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7054 | { |
| 7055 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7056 | IO_CODE(); |
Kevin Wolf | 79a292e | 2023-02-03 16:21:58 +0100 | [diff] [blame] | 7057 | assert_bdrv_graph_readable(); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7058 | |
Emanuele Giuseppe Esposito | 2531b39 | 2023-01-13 21:42:09 +0100 | [diff] [blame] | 7059 | if (drv && drv->bdrv_co_eject) { |
| 7060 | drv->bdrv_co_eject(bs, eject_flag); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7061 | } |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7062 | } |
| 7063 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7064 | /** |
| 7065 | * Lock or unlock the media (if it is locked, the user won't be able |
| 7066 | * to eject it manually). |
| 7067 | */ |
Emanuele Giuseppe Esposito | 2c75261 | 2023-01-13 21:42:10 +0100 | [diff] [blame] | 7068 | void coroutine_fn bdrv_co_lock_medium(BlockDriverState *bs, bool locked) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7069 | { |
| 7070 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7071 | IO_CODE(); |
Kevin Wolf | 79a292e | 2023-02-03 16:21:58 +0100 | [diff] [blame] | 7072 | assert_bdrv_graph_readable(); |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 7073 | trace_bdrv_lock_medium(bs, locked); |
Stefan Hajnoczi | b8c6d09 | 2011-03-29 20:04:40 +0100 | [diff] [blame] | 7074 | |
Emanuele Giuseppe Esposito | 2c75261 | 2023-01-13 21:42:10 +0100 | [diff] [blame] | 7075 | if (drv && drv->bdrv_co_lock_medium) { |
| 7076 | drv->bdrv_co_lock_medium(bs, locked); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7077 | } |
| 7078 | } |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 7079 | |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 7080 | /* Get a reference to bs */ |
| 7081 | void bdrv_ref(BlockDriverState *bs) |
| 7082 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7083 | GLOBAL_STATE_CODE(); |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 7084 | bs->refcnt++; |
| 7085 | } |
| 7086 | |
| 7087 | /* Release a previously grabbed reference to bs. |
| 7088 | * If after releasing, reference count is zero, the BlockDriverState is |
| 7089 | * deleted. */ |
| 7090 | void bdrv_unref(BlockDriverState *bs) |
| 7091 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7092 | GLOBAL_STATE_CODE(); |
Jeff Cody | 9a4d5ca | 2014-07-23 17:22:57 -0400 | [diff] [blame] | 7093 | if (!bs) { |
| 7094 | return; |
| 7095 | } |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 7096 | assert(bs->refcnt > 0); |
| 7097 | if (--bs->refcnt == 0) { |
| 7098 | bdrv_delete(bs); |
| 7099 | } |
| 7100 | } |
| 7101 | |
Kevin Wolf | 6bc0bcc | 2023-11-15 18:20:10 +0100 | [diff] [blame] | 7102 | static void bdrv_schedule_unref_bh(void *opaque) |
| 7103 | { |
| 7104 | BlockDriverState *bs = opaque; |
Kevin Wolf | 6bc0bcc | 2023-11-15 18:20:10 +0100 | [diff] [blame] | 7105 | |
Kevin Wolf | 6bc0bcc | 2023-11-15 18:20:10 +0100 | [diff] [blame] | 7106 | bdrv_unref(bs); |
Kevin Wolf | 6bc0bcc | 2023-11-15 18:20:10 +0100 | [diff] [blame] | 7107 | } |
| 7108 | |
Kevin Wolf | ac2ae23 | 2023-09-11 11:46:04 +0200 | [diff] [blame] | 7109 | /* |
| 7110 | * Release a BlockDriverState reference while holding the graph write lock. |
| 7111 | * |
| 7112 | * Calling bdrv_unref() directly is forbidden while holding the graph lock |
| 7113 | * because bdrv_close() both involves polling and taking the graph lock |
| 7114 | * internally. bdrv_schedule_unref() instead delays decreasing the refcount and |
| 7115 | * possibly closing @bs until the graph lock is released. |
| 7116 | */ |
| 7117 | void bdrv_schedule_unref(BlockDriverState *bs) |
| 7118 | { |
| 7119 | if (!bs) { |
| 7120 | return; |
| 7121 | } |
Kevin Wolf | 6bc0bcc | 2023-11-15 18:20:10 +0100 | [diff] [blame] | 7122 | 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] | 7123 | } |
| 7124 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7125 | struct BdrvOpBlocker { |
| 7126 | Error *reason; |
| 7127 | QLIST_ENTRY(BdrvOpBlocker) list; |
| 7128 | }; |
| 7129 | |
| 7130 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) |
| 7131 | { |
| 7132 | BdrvOpBlocker *blocker; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7133 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 0bb79c9 | 2023-09-29 16:51:49 +0200 | [diff] [blame] | 7134 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7135 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 7136 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { |
| 7137 | blocker = QLIST_FIRST(&bs->op_blockers[op]); |
Markus Armbruster | 4b57664 | 2018-10-17 10:26:25 +0200 | [diff] [blame] | 7138 | error_propagate_prepend(errp, error_copy(blocker->reason), |
| 7139 | "Node '%s' is busy: ", |
| 7140 | bdrv_get_device_or_node_name(bs)); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7141 | return true; |
| 7142 | } |
| 7143 | return false; |
| 7144 | } |
| 7145 | |
| 7146 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 7147 | { |
| 7148 | BdrvOpBlocker *blocker; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7149 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7150 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 7151 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 7152 | blocker = g_new0(BdrvOpBlocker, 1); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7153 | blocker->reason = reason; |
| 7154 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); |
| 7155 | } |
| 7156 | |
| 7157 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 7158 | { |
| 7159 | BdrvOpBlocker *blocker, *next; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7160 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7161 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 7162 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { |
| 7163 | if (blocker->reason == reason) { |
| 7164 | QLIST_REMOVE(blocker, list); |
| 7165 | g_free(blocker); |
| 7166 | } |
| 7167 | } |
| 7168 | } |
| 7169 | |
| 7170 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) |
| 7171 | { |
| 7172 | int i; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7173 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7174 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 7175 | bdrv_op_block(bs, i, reason); |
| 7176 | } |
| 7177 | } |
| 7178 | |
| 7179 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) |
| 7180 | { |
| 7181 | int i; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7182 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7183 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 7184 | bdrv_op_unblock(bs, i, reason); |
| 7185 | } |
| 7186 | } |
| 7187 | |
| 7188 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) |
| 7189 | { |
| 7190 | int i; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7191 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7192 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 7193 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { |
| 7194 | return false; |
| 7195 | } |
| 7196 | } |
| 7197 | return true; |
| 7198 | } |
| 7199 | |
Kevin Wolf | e135505 | 2022-12-07 14:18:30 +0100 | [diff] [blame] | 7200 | /* |
| 7201 | * Must not be called while holding the lock of an AioContext other than the |
| 7202 | * current one. |
| 7203 | */ |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 7204 | void bdrv_img_create(const char *filename, const char *fmt, |
| 7205 | const char *base_filename, const char *base_fmt, |
Fam Zheng | 9217283 | 2017-04-21 20:27:01 +0800 | [diff] [blame] | 7206 | char *options, uint64_t img_size, int flags, bool quiet, |
| 7207 | Error **errp) |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7208 | { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7209 | QemuOptsList *create_opts = NULL; |
| 7210 | QemuOpts *opts = NULL; |
| 7211 | const char *backing_fmt, *backing_file; |
| 7212 | int64_t size; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7213 | BlockDriver *drv, *proto_drv; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 7214 | Error *local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7215 | int ret = 0; |
| 7216 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7217 | GLOBAL_STATE_CODE(); |
| 7218 | |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7219 | /* Find driver and parse its options */ |
| 7220 | drv = bdrv_find_format(fmt); |
| 7221 | if (!drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 7222 | error_setg(errp, "Unknown file format '%s'", fmt); |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 7223 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7224 | } |
| 7225 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 7226 | proto_drv = bdrv_find_protocol(filename, true, errp); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7227 | if (!proto_drv) { |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 7228 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7229 | } |
| 7230 | |
Max Reitz | c614972 | 2014-12-02 18:32:45 +0100 | [diff] [blame] | 7231 | if (!drv->create_opts) { |
| 7232 | error_setg(errp, "Format driver '%s' does not support image creation", |
| 7233 | drv->format_name); |
| 7234 | return; |
| 7235 | } |
| 7236 | |
Maxim Levitsky | 5a5e7f8 | 2020-03-26 03:12:18 +0200 | [diff] [blame] | 7237 | if (!proto_drv->create_opts) { |
| 7238 | error_setg(errp, "Protocol driver '%s' does not support image creation", |
| 7239 | proto_drv->format_name); |
| 7240 | return; |
| 7241 | } |
| 7242 | |
Kevin Wolf | f6dc1c3 | 2019-11-26 16:45:49 +0100 | [diff] [blame] | 7243 | /* Create parameter list */ |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 7244 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
Maxim Levitsky | 5a5e7f8 | 2020-03-26 03:12:18 +0200 | [diff] [blame] | 7245 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7246 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7247 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7248 | |
| 7249 | /* Parse -o options */ |
| 7250 | if (options) { |
Markus Armbruster | a5f9b9d | 2020-07-07 18:06:05 +0200 | [diff] [blame] | 7251 | if (!qemu_opts_do_parse(opts, options, NULL, errp)) { |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7252 | goto out; |
| 7253 | } |
| 7254 | } |
| 7255 | |
Kevin Wolf | f6dc1c3 | 2019-11-26 16:45:49 +0100 | [diff] [blame] | 7256 | if (!qemu_opt_get(opts, BLOCK_OPT_SIZE)) { |
| 7257 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size, &error_abort); |
| 7258 | } else if (img_size != UINT64_C(-1)) { |
| 7259 | error_setg(errp, "The image size must be specified only once"); |
| 7260 | goto out; |
| 7261 | } |
| 7262 | |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7263 | if (base_filename) { |
Markus Armbruster | 235e59c | 2020-07-07 18:05:42 +0200 | [diff] [blame] | 7264 | if (!qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, |
Markus Armbruster | 3882578 | 2020-07-07 18:05:43 +0200 | [diff] [blame] | 7265 | NULL)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 7266 | error_setg(errp, "Backing file not supported for file format '%s'", |
| 7267 | fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7268 | goto out; |
| 7269 | } |
| 7270 | } |
| 7271 | |
| 7272 | if (base_fmt) { |
Markus Armbruster | 3882578 | 2020-07-07 18:05:43 +0200 | [diff] [blame] | 7273 | if (!qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, NULL)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 7274 | error_setg(errp, "Backing file format not supported for file " |
| 7275 | "format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7276 | goto out; |
| 7277 | } |
| 7278 | } |
| 7279 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7280 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
| 7281 | if (backing_file) { |
| 7282 | if (!strcmp(filename, backing_file)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 7283 | error_setg(errp, "Error: Trying to create an image with the " |
| 7284 | "same filename as the backing file"); |
Jes Sorensen | 792da93 | 2010-12-16 13:52:17 +0100 | [diff] [blame] | 7285 | goto out; |
| 7286 | } |
Connor Kuehl | 975a7bd | 2020-08-13 08:47:22 -0500 | [diff] [blame] | 7287 | if (backing_file[0] == '\0') { |
| 7288 | error_setg(errp, "Expected backing file name, got empty string"); |
| 7289 | goto out; |
| 7290 | } |
Jes Sorensen | 792da93 | 2010-12-16 13:52:17 +0100 | [diff] [blame] | 7291 | } |
| 7292 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7293 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7294 | |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7295 | /* The size for the image must always be specified, unless we have a backing |
| 7296 | * file and we have not been forbidden from opening it. */ |
Eric Blake | a8b42a1 | 2017-09-25 09:55:07 -0500 | [diff] [blame] | 7297 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, img_size); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7298 | if (backing_file && !(flags & BDRV_O_NO_BACKING)) { |
| 7299 | BlockDriverState *bs; |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 7300 | char *full_backing; |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7301 | int back_flags; |
| 7302 | QDict *backing_options = NULL; |
Paolo Bonzini | 63090da | 2012-04-12 14:01:03 +0200 | [diff] [blame] | 7303 | |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 7304 | full_backing = |
| 7305 | bdrv_get_full_backing_filename_from_filename(filename, backing_file, |
| 7306 | &local_err); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7307 | if (local_err) { |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7308 | goto out; |
| 7309 | } |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 7310 | assert(full_backing); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7311 | |
Max Reitz | d5b2399 | 2021-06-22 16:00:30 +0200 | [diff] [blame] | 7312 | /* |
| 7313 | * No need to do I/O here, which allows us to open encrypted |
| 7314 | * backing images without needing the secret |
| 7315 | */ |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7316 | back_flags = flags; |
| 7317 | back_flags &= ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
Max Reitz | d5b2399 | 2021-06-22 16:00:30 +0200 | [diff] [blame] | 7318 | back_flags |= BDRV_O_NO_IO; |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7319 | |
Fam Zheng | cc954f0 | 2017-12-15 16:04:45 +0800 | [diff] [blame] | 7320 | backing_options = qdict_new(); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7321 | if (backing_fmt) { |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7322 | qdict_put_str(backing_options, "driver", backing_fmt); |
| 7323 | } |
Fam Zheng | cc954f0 | 2017-12-15 16:04:45 +0800 | [diff] [blame] | 7324 | qdict_put_bool(backing_options, BDRV_OPT_FORCE_SHARE, true); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7325 | |
| 7326 | bs = bdrv_open(full_backing, NULL, backing_options, back_flags, |
| 7327 | &local_err); |
| 7328 | g_free(full_backing); |
Eric Blake | add8200 | 2020-07-06 15:39:50 -0500 | [diff] [blame] | 7329 | if (!bs) { |
| 7330 | error_append_hint(&local_err, "Could not open backing image.\n"); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7331 | goto out; |
| 7332 | } else { |
Eric Blake | d9f059a | 2020-07-06 15:39:54 -0500 | [diff] [blame] | 7333 | if (!backing_fmt) { |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 7334 | error_setg(&local_err, |
| 7335 | "Backing file specified without backing format"); |
Michael Tokarev | fbdffb0 | 2023-04-05 16:34:04 +0300 | [diff] [blame] | 7336 | error_append_hint(&local_err, "Detected format of %s.\n", |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 7337 | bs->drv->format_name); |
| 7338 | goto out; |
Eric Blake | d9f059a | 2020-07-06 15:39:54 -0500 | [diff] [blame] | 7339 | } |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7340 | if (size == -1) { |
| 7341 | /* Opened BS, have no size */ |
| 7342 | size = bdrv_getlength(bs); |
| 7343 | if (size < 0) { |
| 7344 | error_setg_errno(errp, -size, "Could not get size of '%s'", |
| 7345 | backing_file); |
| 7346 | bdrv_unref(bs); |
| 7347 | goto out; |
| 7348 | } |
| 7349 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort); |
| 7350 | } |
| 7351 | bdrv_unref(bs); |
| 7352 | } |
Eric Blake | d9f059a | 2020-07-06 15:39:54 -0500 | [diff] [blame] | 7353 | /* (backing_file && !(flags & BDRV_O_NO_BACKING)) */ |
| 7354 | } else if (backing_file && !backing_fmt) { |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 7355 | error_setg(&local_err, |
| 7356 | "Backing file specified without backing format"); |
| 7357 | goto out; |
Eric Blake | d9f059a | 2020-07-06 15:39:54 -0500 | [diff] [blame] | 7358 | } |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7359 | |
| 7360 | if (size == -1) { |
| 7361 | error_setg(errp, "Image creation needs a size parameter"); |
| 7362 | goto out; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7363 | } |
| 7364 | |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 7365 | if (!quiet) { |
Kővágó, Zoltán | fe64669 | 2015-07-07 16:42:10 +0200 | [diff] [blame] | 7366 | printf("Formatting '%s', fmt=%s ", filename, fmt); |
Fam Zheng | 43c5d8f | 2014-12-09 15:38:04 +0800 | [diff] [blame] | 7367 | qemu_opts_print(opts, " "); |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 7368 | puts(""); |
Eric Blake | 4e2f441 | 2020-07-06 15:39:45 -0500 | [diff] [blame] | 7369 | fflush(stdout); |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 7370 | } |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7371 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 7372 | ret = bdrv_create(drv, filename, opts, &local_err); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7373 | |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 7374 | if (ret == -EFBIG) { |
| 7375 | /* This is generally a better message than whatever the driver would |
| 7376 | * deliver (especially because of the cluster_size_hint), since that |
| 7377 | * is most probably not much different from "image too large". */ |
| 7378 | const char *cluster_size_hint = ""; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7379 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 7380 | cluster_size_hint = " (try using a larger cluster size)"; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7381 | } |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 7382 | error_setg(errp, "The image size is too large for file format '%s'" |
| 7383 | "%s", fmt, cluster_size_hint); |
| 7384 | error_free(local_err); |
| 7385 | local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7386 | } |
| 7387 | |
| 7388 | out: |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7389 | qemu_opts_del(opts); |
| 7390 | qemu_opts_free(create_opts); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 7391 | error_propagate(errp, local_err); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7392 | } |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 7393 | |
| 7394 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) |
| 7395 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7396 | IO_CODE(); |
Stefan Hajnoczi | 33f2a75 | 2018-02-16 16:50:13 +0000 | [diff] [blame] | 7397 | return bs ? bs->aio_context : qemu_get_aio_context(); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7398 | } |
| 7399 | |
Kevin Wolf | e336fd4 | 2020-10-05 17:58:53 +0200 | [diff] [blame] | 7400 | AioContext *coroutine_fn bdrv_co_enter(BlockDriverState *bs) |
| 7401 | { |
| 7402 | Coroutine *self = qemu_coroutine_self(); |
| 7403 | AioContext *old_ctx = qemu_coroutine_get_aio_context(self); |
| 7404 | AioContext *new_ctx; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7405 | IO_CODE(); |
Kevin Wolf | e336fd4 | 2020-10-05 17:58:53 +0200 | [diff] [blame] | 7406 | |
| 7407 | /* |
| 7408 | * Increase bs->in_flight to ensure that this operation is completed before |
| 7409 | * moving the node to a different AioContext. Read new_ctx only afterwards. |
| 7410 | */ |
| 7411 | bdrv_inc_in_flight(bs); |
| 7412 | |
| 7413 | new_ctx = bdrv_get_aio_context(bs); |
| 7414 | aio_co_reschedule_self(new_ctx); |
| 7415 | return old_ctx; |
| 7416 | } |
| 7417 | |
| 7418 | void coroutine_fn bdrv_co_leave(BlockDriverState *bs, AioContext *old_ctx) |
| 7419 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7420 | IO_CODE(); |
Kevin Wolf | e336fd4 | 2020-10-05 17:58:53 +0200 | [diff] [blame] | 7421 | aio_co_reschedule_self(old_ctx); |
| 7422 | bdrv_dec_in_flight(bs); |
| 7423 | } |
| 7424 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7425 | static void bdrv_do_remove_aio_context_notifier(BdrvAioNotifier *ban) |
| 7426 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 7427 | GLOBAL_STATE_CODE(); |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7428 | QLIST_REMOVE(ban, list); |
| 7429 | g_free(ban); |
| 7430 | } |
| 7431 | |
Kevin Wolf | a3a683c | 2019-05-06 19:17:57 +0200 | [diff] [blame] | 7432 | static void bdrv_detach_aio_context(BlockDriverState *bs) |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7433 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7434 | BdrvAioNotifier *baf, *baf_tmp; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7435 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7436 | assert(!bs->walking_aio_notifiers); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 7437 | GLOBAL_STATE_CODE(); |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7438 | bs->walking_aio_notifiers = true; |
| 7439 | QLIST_FOREACH_SAFE(baf, &bs->aio_notifiers, list, baf_tmp) { |
| 7440 | if (baf->deleted) { |
| 7441 | bdrv_do_remove_aio_context_notifier(baf); |
| 7442 | } else { |
| 7443 | baf->detach_aio_context(baf->opaque); |
| 7444 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7445 | } |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7446 | /* Never mind iterating again to check for ->deleted. bdrv_close() will |
| 7447 | * remove remaining aio notifiers if we aren't called again. |
| 7448 | */ |
| 7449 | bs->walking_aio_notifiers = false; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7450 | |
Kevin Wolf | 1bffe1a | 2019-04-17 17:15:25 +0200 | [diff] [blame] | 7451 | if (bs->drv && bs->drv->bdrv_detach_aio_context) { |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7452 | bs->drv->bdrv_detach_aio_context(bs); |
| 7453 | } |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7454 | |
| 7455 | bs->aio_context = NULL; |
| 7456 | } |
| 7457 | |
Kevin Wolf | a3a683c | 2019-05-06 19:17:57 +0200 | [diff] [blame] | 7458 | static void bdrv_attach_aio_context(BlockDriverState *bs, |
| 7459 | AioContext *new_context) |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7460 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7461 | BdrvAioNotifier *ban, *ban_tmp; |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 7462 | GLOBAL_STATE_CODE(); |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7463 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7464 | bs->aio_context = new_context; |
| 7465 | |
Kevin Wolf | 1bffe1a | 2019-04-17 17:15:25 +0200 | [diff] [blame] | 7466 | if (bs->drv && bs->drv->bdrv_attach_aio_context) { |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7467 | bs->drv->bdrv_attach_aio_context(bs, new_context); |
| 7468 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7469 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7470 | assert(!bs->walking_aio_notifiers); |
| 7471 | bs->walking_aio_notifiers = true; |
| 7472 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_tmp) { |
| 7473 | if (ban->deleted) { |
| 7474 | bdrv_do_remove_aio_context_notifier(ban); |
| 7475 | } else { |
| 7476 | ban->attached_aio_context(new_context, ban->opaque); |
| 7477 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7478 | } |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7479 | bs->walking_aio_notifiers = false; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7480 | } |
| 7481 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7482 | typedef struct BdrvStateSetAioContext { |
| 7483 | AioContext *new_ctx; |
| 7484 | BlockDriverState *bs; |
| 7485 | } BdrvStateSetAioContext; |
| 7486 | |
| 7487 | static bool bdrv_parent_change_aio_context(BdrvChild *c, AioContext *ctx, |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7488 | GHashTable *visited, |
| 7489 | Transaction *tran, |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7490 | Error **errp) |
| 7491 | { |
| 7492 | GLOBAL_STATE_CODE(); |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7493 | if (g_hash_table_contains(visited, c)) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7494 | return true; |
| 7495 | } |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7496 | g_hash_table_add(visited, c); |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7497 | |
| 7498 | /* |
| 7499 | * A BdrvChildClass that doesn't handle AioContext changes cannot |
| 7500 | * tolerate any AioContext changes |
| 7501 | */ |
| 7502 | if (!c->klass->change_aio_ctx) { |
| 7503 | char *user = bdrv_child_user_desc(c); |
| 7504 | error_setg(errp, "Changing iothreads is not supported by %s", user); |
| 7505 | g_free(user); |
| 7506 | return false; |
| 7507 | } |
| 7508 | if (!c->klass->change_aio_ctx(c, ctx, visited, tran, errp)) { |
| 7509 | assert(!errp || *errp); |
| 7510 | return false; |
| 7511 | } |
| 7512 | return true; |
| 7513 | } |
| 7514 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7515 | bool bdrv_child_change_aio_context(BdrvChild *c, AioContext *ctx, |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7516 | GHashTable *visited, Transaction *tran, |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7517 | Error **errp) |
| 7518 | { |
| 7519 | GLOBAL_STATE_CODE(); |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7520 | if (g_hash_table_contains(visited, c)) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7521 | return true; |
| 7522 | } |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7523 | g_hash_table_add(visited, c); |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7524 | return bdrv_change_aio_context(c->bs, ctx, visited, tran, errp); |
| 7525 | } |
| 7526 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7527 | static void bdrv_set_aio_context_clean(void *opaque) |
| 7528 | { |
| 7529 | BdrvStateSetAioContext *state = (BdrvStateSetAioContext *) opaque; |
| 7530 | BlockDriverState *bs = (BlockDriverState *) state->bs; |
| 7531 | |
| 7532 | /* Paired with bdrv_drained_begin in bdrv_change_aio_context() */ |
| 7533 | bdrv_drained_end(bs); |
| 7534 | |
| 7535 | g_free(state); |
| 7536 | } |
| 7537 | |
| 7538 | static void bdrv_set_aio_context_commit(void *opaque) |
| 7539 | { |
| 7540 | BdrvStateSetAioContext *state = (BdrvStateSetAioContext *) opaque; |
| 7541 | BlockDriverState *bs = (BlockDriverState *) state->bs; |
| 7542 | AioContext *new_context = state->new_ctx; |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7543 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7544 | bdrv_detach_aio_context(bs); |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7545 | bdrv_attach_aio_context(bs, new_context); |
| 7546 | } |
| 7547 | |
| 7548 | static TransactionActionDrv set_aio_context = { |
| 7549 | .commit = bdrv_set_aio_context_commit, |
| 7550 | .clean = bdrv_set_aio_context_clean, |
| 7551 | }; |
| 7552 | |
Kevin Wolf | 42a65f0 | 2019-05-07 18:31:38 +0200 | [diff] [blame] | 7553 | /* |
| 7554 | * Changes the AioContext used for fd handlers, timers, and BHs by this |
| 7555 | * BlockDriverState and all its children and parents. |
| 7556 | * |
Max Reitz | 43eaaae | 2019-07-22 15:30:54 +0200 | [diff] [blame] | 7557 | * Must be called from the main AioContext. |
| 7558 | * |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7559 | * @visited will accumulate all visited BdrvChild objects. The caller is |
Kevin Wolf | 42a65f0 | 2019-05-07 18:31:38 +0200 | [diff] [blame] | 7560 | * responsible for freeing the list afterwards. |
| 7561 | */ |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7562 | static bool bdrv_change_aio_context(BlockDriverState *bs, AioContext *ctx, |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7563 | GHashTable *visited, Transaction *tran, |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7564 | Error **errp) |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7565 | { |
| 7566 | BdrvChild *c; |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7567 | BdrvStateSetAioContext *state; |
| 7568 | |
| 7569 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7570 | |
| 7571 | if (bdrv_get_aio_context(bs) == ctx) { |
| 7572 | return true; |
| 7573 | } |
| 7574 | |
Kevin Wolf | 7f831d2 | 2023-09-11 11:46:17 +0200 | [diff] [blame] | 7575 | bdrv_graph_rdlock_main_loop(); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7576 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7577 | if (!bdrv_parent_change_aio_context(c, ctx, visited, tran, errp)) { |
Kevin Wolf | 7f831d2 | 2023-09-11 11:46:17 +0200 | [diff] [blame] | 7578 | bdrv_graph_rdunlock_main_loop(); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7579 | return false; |
| 7580 | } |
| 7581 | } |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7582 | |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7583 | QLIST_FOREACH(c, &bs->children, next) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7584 | if (!bdrv_child_change_aio_context(c, ctx, visited, tran, errp)) { |
Kevin Wolf | 7f831d2 | 2023-09-11 11:46:17 +0200 | [diff] [blame] | 7585 | bdrv_graph_rdunlock_main_loop(); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7586 | return false; |
| 7587 | } |
| 7588 | } |
Kevin Wolf | 7f831d2 | 2023-09-11 11:46:17 +0200 | [diff] [blame] | 7589 | bdrv_graph_rdunlock_main_loop(); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7590 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7591 | state = g_new(BdrvStateSetAioContext, 1); |
| 7592 | *state = (BdrvStateSetAioContext) { |
| 7593 | .new_ctx = ctx, |
| 7594 | .bs = bs, |
| 7595 | }; |
| 7596 | |
| 7597 | /* Paired with bdrv_drained_end in bdrv_set_aio_context_clean() */ |
| 7598 | bdrv_drained_begin(bs); |
| 7599 | |
| 7600 | tran_add(tran, &set_aio_context, state); |
| 7601 | |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7602 | return true; |
| 7603 | } |
| 7604 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7605 | /* |
| 7606 | * Change bs's and recursively all of its parents' and children's AioContext |
| 7607 | * to the given new context, returning an error if that isn't possible. |
| 7608 | * |
| 7609 | * If ignore_child is not NULL, that child (and its subgraph) will not |
| 7610 | * be touched. |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7611 | */ |
Emanuele Giuseppe Esposito | a41cfda | 2022-10-25 04:49:51 -0400 | [diff] [blame] | 7612 | int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx, |
| 7613 | BdrvChild *ignore_child, Error **errp) |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7614 | { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7615 | Transaction *tran; |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7616 | GHashTable *visited; |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7617 | int ret; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7618 | GLOBAL_STATE_CODE(); |
| 7619 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7620 | /* |
| 7621 | * Recursion phase: go through all nodes of the graph. |
| 7622 | * Take care of checking that all nodes support changing AioContext |
Michael Tokarev | 3202d8e | 2023-07-14 14:06:05 +0300 | [diff] [blame] | 7623 | * 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] | 7624 | * is successful (the transaction itself). |
| 7625 | */ |
| 7626 | tran = tran_new(); |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7627 | visited = g_hash_table_new(NULL, NULL); |
| 7628 | if (ignore_child) { |
| 7629 | g_hash_table_add(visited, ignore_child); |
| 7630 | } |
| 7631 | ret = bdrv_change_aio_context(bs, ctx, visited, tran, errp); |
| 7632 | g_hash_table_destroy(visited); |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7633 | |
| 7634 | /* |
| 7635 | * Linear phase: go through all callbacks collected in the transaction. |
Stefan Hajnoczi | 23c983c | 2023-12-05 13:20:11 -0500 | [diff] [blame] | 7636 | * Run all callbacks collected in the recursion to switch every node's |
| 7637 | * AioContext (transaction commit), or undo all changes done in the |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7638 | * recursion (transaction abort). |
| 7639 | */ |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7640 | |
| 7641 | if (!ret) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7642 | /* Just run clean() callbacks. No AioContext changed. */ |
| 7643 | tran_abort(tran); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7644 | return -EPERM; |
| 7645 | } |
| 7646 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7647 | tran_commit(tran); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7648 | return 0; |
| 7649 | } |
| 7650 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7651 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
| 7652 | void (*attached_aio_context)(AioContext *new_context, void *opaque), |
| 7653 | void (*detach_aio_context)(void *opaque), void *opaque) |
| 7654 | { |
| 7655 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); |
| 7656 | *ban = (BdrvAioNotifier){ |
| 7657 | .attached_aio_context = attached_aio_context, |
| 7658 | .detach_aio_context = detach_aio_context, |
| 7659 | .opaque = opaque |
| 7660 | }; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7661 | GLOBAL_STATE_CODE(); |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7662 | |
| 7663 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); |
| 7664 | } |
| 7665 | |
| 7666 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, |
| 7667 | void (*attached_aio_context)(AioContext *, |
| 7668 | void *), |
| 7669 | void (*detach_aio_context)(void *), |
| 7670 | void *opaque) |
| 7671 | { |
| 7672 | BdrvAioNotifier *ban, *ban_next; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7673 | GLOBAL_STATE_CODE(); |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7674 | |
| 7675 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 7676 | if (ban->attached_aio_context == attached_aio_context && |
| 7677 | ban->detach_aio_context == detach_aio_context && |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7678 | ban->opaque == opaque && |
| 7679 | ban->deleted == false) |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7680 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7681 | if (bs->walking_aio_notifiers) { |
| 7682 | ban->deleted = true; |
| 7683 | } else { |
| 7684 | bdrv_do_remove_aio_context_notifier(ban); |
| 7685 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7686 | return; |
| 7687 | } |
| 7688 | } |
| 7689 | |
| 7690 | abort(); |
| 7691 | } |
| 7692 | |
Max Reitz | 7748543 | 2014-10-27 11:12:50 +0100 | [diff] [blame] | 7693 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 7694 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
Maxim Levitsky | a3579bf | 2020-06-25 14:55:38 +0200 | [diff] [blame] | 7695 | bool force, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 7696 | Error **errp) |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 7697 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7698 | GLOBAL_STATE_CODE(); |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 7699 | if (!bs->drv) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 7700 | error_setg(errp, "Node is ejected"); |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 7701 | return -ENOMEDIUM; |
| 7702 | } |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 7703 | if (!bs->drv->bdrv_amend_options) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 7704 | error_setg(errp, "Block driver '%s' does not support option amendment", |
| 7705 | bs->drv->format_name); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 7706 | return -ENOTSUP; |
| 7707 | } |
Maxim Levitsky | a3579bf | 2020-06-25 14:55:38 +0200 | [diff] [blame] | 7708 | return bs->drv->bdrv_amend_options(bs, opts, status_cb, |
| 7709 | cb_opaque, force, errp); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 7710 | } |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 7711 | |
Max Reitz | 5d69b5a | 2020-02-18 11:34:41 +0100 | [diff] [blame] | 7712 | /* |
| 7713 | * This function checks whether the given @to_replace is allowed to be |
| 7714 | * replaced by a node that always shows the same data as @bs. This is |
| 7715 | * used for example to verify whether the mirror job can replace |
| 7716 | * @to_replace by the target mirrored from @bs. |
| 7717 | * To be replaceable, @bs and @to_replace may either be guaranteed to |
| 7718 | * always show the same data (because they are only connected through |
| 7719 | * filters), or some driver may allow replacing one of its children |
| 7720 | * because it can guarantee that this child's data is not visible at |
| 7721 | * all (for example, for dissenting quorum children that have no other |
| 7722 | * parents). |
| 7723 | */ |
| 7724 | bool bdrv_recurse_can_replace(BlockDriverState *bs, |
| 7725 | BlockDriverState *to_replace) |
| 7726 | { |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 7727 | BlockDriverState *filtered; |
| 7728 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 7729 | GLOBAL_STATE_CODE(); |
| 7730 | |
Max Reitz | 5d69b5a | 2020-02-18 11:34:41 +0100 | [diff] [blame] | 7731 | if (!bs || !bs->drv) { |
| 7732 | return false; |
| 7733 | } |
| 7734 | |
| 7735 | if (bs == to_replace) { |
| 7736 | return true; |
| 7737 | } |
| 7738 | |
| 7739 | /* See what the driver can do */ |
| 7740 | if (bs->drv->bdrv_recurse_can_replace) { |
| 7741 | return bs->drv->bdrv_recurse_can_replace(bs, to_replace); |
| 7742 | } |
| 7743 | |
| 7744 | /* For filters without an own implementation, we can recurse on our own */ |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 7745 | filtered = bdrv_filter_bs(bs); |
| 7746 | if (filtered) { |
| 7747 | return bdrv_recurse_can_replace(filtered, to_replace); |
Max Reitz | 5d69b5a | 2020-02-18 11:34:41 +0100 | [diff] [blame] | 7748 | } |
| 7749 | |
| 7750 | /* Safe default */ |
| 7751 | return false; |
| 7752 | } |
| 7753 | |
Max Reitz | 810803a | 2020-02-18 11:34:44 +0100 | [diff] [blame] | 7754 | /* |
| 7755 | * Check whether the given @node_name can be replaced by a node that |
| 7756 | * has the same data as @parent_bs. If so, return @node_name's BDS; |
| 7757 | * NULL otherwise. |
| 7758 | * |
| 7759 | * @node_name must be a (recursive) *child of @parent_bs (or this |
| 7760 | * function will return NULL). |
| 7761 | * |
| 7762 | * The result (whether the node can be replaced or not) is only valid |
| 7763 | * for as long as no graph or permission changes occur. |
| 7764 | */ |
Wen Congyang | e12f378 | 2015-07-17 10:12:22 +0800 | [diff] [blame] | 7765 | BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, |
| 7766 | const char *node_name, Error **errp) |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7767 | { |
| 7768 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 7769 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7770 | GLOBAL_STATE_CODE(); |
| 7771 | |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7772 | if (!to_replace_bs) { |
Connor Kuehl | 785ec4b | 2021-03-05 09:19:28 -0600 | [diff] [blame] | 7773 | 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] | 7774 | return NULL; |
| 7775 | } |
| 7776 | |
| 7777 | 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] | 7778 | return NULL; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7779 | } |
| 7780 | |
| 7781 | /* We don't want arbitrary node of the BDS chain to be replaced only the top |
| 7782 | * most non filter in order to prevent data corruption. |
| 7783 | * Another benefit is that this tests exclude backing files which are |
| 7784 | * blocked by the backing blockers. |
| 7785 | */ |
Max Reitz | 810803a | 2020-02-18 11:34:44 +0100 | [diff] [blame] | 7786 | if (!bdrv_recurse_can_replace(parent_bs, to_replace_bs)) { |
| 7787 | error_setg(errp, "Cannot replace '%s' by a node mirrored from '%s', " |
| 7788 | "because it cannot be guaranteed that doing so would not " |
| 7789 | "lead to an abrupt change of visible data", |
| 7790 | node_name, parent_bs->node_name); |
Stefan Hajnoczi | b49f475 | 2023-12-05 13:20:03 -0500 | [diff] [blame] | 7791 | return NULL; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7792 | } |
| 7793 | |
| 7794 | return to_replace_bs; |
| 7795 | } |
Ming Lei | 448ad91 | 2014-07-04 18:04:33 +0800 | [diff] [blame] | 7796 | |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7797 | /** |
| 7798 | * Iterates through the list of runtime option keys that are said to |
| 7799 | * be "strong" for a BDS. An option is called "strong" if it changes |
| 7800 | * a BDS's data. For example, the null block driver's "size" and |
| 7801 | * "read-zeroes" options are strong, but its "latency-ns" option is |
| 7802 | * not. |
| 7803 | * |
| 7804 | * If a key returned by this function ends with a dot, all options |
| 7805 | * starting with that prefix are strong. |
| 7806 | */ |
| 7807 | static const char *const *strong_options(BlockDriverState *bs, |
| 7808 | const char *const *curopt) |
| 7809 | { |
| 7810 | static const char *const global_options[] = { |
| 7811 | "driver", "filename", NULL |
| 7812 | }; |
| 7813 | |
| 7814 | if (!curopt) { |
| 7815 | return &global_options[0]; |
| 7816 | } |
| 7817 | |
| 7818 | curopt++; |
| 7819 | if (curopt == &global_options[ARRAY_SIZE(global_options) - 1] && bs->drv) { |
| 7820 | curopt = bs->drv->strong_runtime_opts; |
| 7821 | } |
| 7822 | |
| 7823 | return (curopt && *curopt) ? curopt : NULL; |
| 7824 | } |
| 7825 | |
| 7826 | /** |
| 7827 | * Copies all strong runtime options from bs->options to the given |
| 7828 | * QDict. The set of strong option keys is determined by invoking |
| 7829 | * strong_options(). |
| 7830 | * |
| 7831 | * Returns true iff any strong option was present in bs->options (and |
| 7832 | * thus copied to the target QDict) with the exception of "filename" |
| 7833 | * and "driver". The caller is expected to use this value to decide |
| 7834 | * whether the existence of strong options prevents the generation of |
| 7835 | * a plain filename. |
| 7836 | */ |
| 7837 | static bool append_strong_runtime_options(QDict *d, BlockDriverState *bs) |
| 7838 | { |
| 7839 | bool found_any = false; |
| 7840 | const char *const *option_name = NULL; |
| 7841 | |
| 7842 | if (!bs->drv) { |
| 7843 | return false; |
| 7844 | } |
| 7845 | |
| 7846 | while ((option_name = strong_options(bs, option_name))) { |
| 7847 | bool option_given = false; |
| 7848 | |
| 7849 | assert(strlen(*option_name) > 0); |
| 7850 | if ((*option_name)[strlen(*option_name) - 1] != '.') { |
| 7851 | QObject *entry = qdict_get(bs->options, *option_name); |
| 7852 | if (!entry) { |
| 7853 | continue; |
| 7854 | } |
| 7855 | |
| 7856 | qdict_put_obj(d, *option_name, qobject_ref(entry)); |
| 7857 | option_given = true; |
| 7858 | } else { |
| 7859 | const QDictEntry *entry; |
| 7860 | for (entry = qdict_first(bs->options); entry; |
| 7861 | entry = qdict_next(bs->options, entry)) |
| 7862 | { |
| 7863 | if (strstart(qdict_entry_key(entry), *option_name, NULL)) { |
| 7864 | qdict_put_obj(d, qdict_entry_key(entry), |
| 7865 | qobject_ref(qdict_entry_value(entry))); |
| 7866 | option_given = true; |
| 7867 | } |
| 7868 | } |
| 7869 | } |
| 7870 | |
| 7871 | /* While "driver" and "filename" need to be included in a JSON filename, |
| 7872 | * their existence does not prohibit generation of a plain filename. */ |
| 7873 | if (!found_any && option_given && |
| 7874 | strcmp(*option_name, "driver") && strcmp(*option_name, "filename")) |
| 7875 | { |
| 7876 | found_any = true; |
| 7877 | } |
| 7878 | } |
| 7879 | |
Max Reitz | 62a01a27 | 2019-02-01 20:29:34 +0100 | [diff] [blame] | 7880 | if (!qdict_haskey(d, "driver")) { |
| 7881 | /* Drivers created with bdrv_new_open_driver() may not have a |
| 7882 | * @driver option. Add it here. */ |
| 7883 | qdict_put_str(d, "driver", bs->drv->format_name); |
| 7884 | } |
| 7885 | |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7886 | return found_any; |
| 7887 | } |
| 7888 | |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7889 | /* Note: This function may return false positives; it may return true |
| 7890 | * even if opening the backing file specified by bs's image header |
| 7891 | * would result in exactly bs->backing. */ |
Kevin Wolf | 004915a | 2023-10-27 17:53:26 +0200 | [diff] [blame] | 7892 | static bool GRAPH_RDLOCK bdrv_backing_overridden(BlockDriverState *bs) |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7893 | { |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 7894 | GLOBAL_STATE_CODE(); |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7895 | if (bs->backing) { |
| 7896 | return strcmp(bs->auto_backing_file, |
| 7897 | bs->backing->bs->filename); |
| 7898 | } else { |
| 7899 | /* No backing BDS, so if the image header reports any backing |
| 7900 | * file, it must have been suppressed */ |
| 7901 | return bs->auto_backing_file[0] != '\0'; |
| 7902 | } |
| 7903 | } |
| 7904 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7905 | /* Updates the following BDS fields: |
| 7906 | * - exact_filename: A filename which may be used for opening a block device |
| 7907 | * which (mostly) equals the given BDS (even without any |
| 7908 | * other options; so reading and writing must return the same |
| 7909 | * results, but caching etc. may be different) |
| 7910 | * - full_open_options: Options which, when given when opening a block device |
| 7911 | * (without a filename), result in a BDS (mostly) |
| 7912 | * equalling the given one |
| 7913 | * - filename: If exact_filename is set, it is copied here. Otherwise, |
| 7914 | * full_open_options is converted to a JSON object, prefixed with |
| 7915 | * "json:" (for use through the JSON pseudo protocol) and put here. |
| 7916 | */ |
| 7917 | void bdrv_refresh_filename(BlockDriverState *bs) |
| 7918 | { |
| 7919 | BlockDriver *drv = bs->drv; |
Max Reitz | e24518e | 2019-02-01 20:29:06 +0100 | [diff] [blame] | 7920 | BdrvChild *child; |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 7921 | BlockDriverState *primary_child_bs; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7922 | QDict *opts; |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7923 | bool backing_overridden; |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 7924 | bool generate_json_filename; /* Whether our default implementation should |
| 7925 | fill exact_filename (false) or not (true) */ |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7926 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7927 | GLOBAL_STATE_CODE(); |
| 7928 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7929 | if (!drv) { |
| 7930 | return; |
| 7931 | } |
| 7932 | |
Max Reitz | e24518e | 2019-02-01 20:29:06 +0100 | [diff] [blame] | 7933 | /* This BDS's file name may depend on any of its children's file names, so |
| 7934 | * refresh those first */ |
| 7935 | QLIST_FOREACH(child, &bs->children, next) { |
| 7936 | bdrv_refresh_filename(child->bs); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7937 | } |
| 7938 | |
Max Reitz | bb808d5 | 2019-02-01 20:29:07 +0100 | [diff] [blame] | 7939 | if (bs->implicit) { |
| 7940 | /* For implicit nodes, just copy everything from the single child */ |
| 7941 | child = QLIST_FIRST(&bs->children); |
| 7942 | assert(QLIST_NEXT(child, next) == NULL); |
| 7943 | |
| 7944 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), |
| 7945 | child->bs->exact_filename); |
| 7946 | pstrcpy(bs->filename, sizeof(bs->filename), child->bs->filename); |
| 7947 | |
Pan Nengyuan | cb89561 | 2020-01-16 16:56:00 +0800 | [diff] [blame] | 7948 | qobject_unref(bs->full_open_options); |
Max Reitz | bb808d5 | 2019-02-01 20:29:07 +0100 | [diff] [blame] | 7949 | bs->full_open_options = qobject_ref(child->bs->full_open_options); |
| 7950 | |
| 7951 | return; |
| 7952 | } |
| 7953 | |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7954 | backing_overridden = bdrv_backing_overridden(bs); |
| 7955 | |
| 7956 | if (bs->open_flags & BDRV_O_NO_IO) { |
| 7957 | /* Without I/O, the backing file does not change anything. |
| 7958 | * Therefore, in such a case (primarily qemu-img), we can |
| 7959 | * pretend the backing file has not been overridden even if |
| 7960 | * it technically has been. */ |
| 7961 | backing_overridden = false; |
| 7962 | } |
| 7963 | |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7964 | /* Gather the options QDict */ |
| 7965 | opts = qdict_new(); |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 7966 | generate_json_filename = append_strong_runtime_options(opts, bs); |
| 7967 | generate_json_filename |= backing_overridden; |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7968 | |
| 7969 | if (drv->bdrv_gather_child_options) { |
| 7970 | /* Some block drivers may not want to present all of their children's |
| 7971 | * options, or name them differently from BdrvChild.name */ |
| 7972 | drv->bdrv_gather_child_options(bs, opts, backing_overridden); |
| 7973 | } else { |
| 7974 | QLIST_FOREACH(child, &bs->children, next) { |
Max Reitz | 25191e5 | 2020-05-13 13:05:33 +0200 | [diff] [blame] | 7975 | if (child == bs->backing && !backing_overridden) { |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7976 | /* We can skip the backing BDS if it has not been overridden */ |
| 7977 | continue; |
| 7978 | } |
| 7979 | |
| 7980 | qdict_put(opts, child->name, |
| 7981 | qobject_ref(child->bs->full_open_options)); |
| 7982 | } |
| 7983 | |
| 7984 | if (backing_overridden && !bs->backing) { |
| 7985 | /* Force no backing file */ |
| 7986 | qdict_put_null(opts, "backing"); |
| 7987 | } |
| 7988 | } |
| 7989 | |
| 7990 | qobject_unref(bs->full_open_options); |
| 7991 | bs->full_open_options = opts; |
| 7992 | |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 7993 | primary_child_bs = bdrv_primary_bs(bs); |
| 7994 | |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 7995 | if (drv->bdrv_refresh_filename) { |
| 7996 | /* Obsolete information is of no use here, so drop the old file name |
| 7997 | * information before refreshing it */ |
| 7998 | bs->exact_filename[0] = '\0'; |
| 7999 | |
| 8000 | drv->bdrv_refresh_filename(bs); |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8001 | } else if (primary_child_bs) { |
| 8002 | /* |
| 8003 | * Try to reconstruct valid information from the underlying |
| 8004 | * file -- this only works for format nodes (filter nodes |
| 8005 | * cannot be probed and as such must be selected by the user |
| 8006 | * either through an options dict, or through a special |
| 8007 | * filename which the filter driver must construct in its |
| 8008 | * .bdrv_refresh_filename() implementation). |
| 8009 | */ |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 8010 | |
| 8011 | bs->exact_filename[0] = '\0'; |
| 8012 | |
Max Reitz | fb695c7 | 2019-02-01 20:29:29 +0100 | [diff] [blame] | 8013 | /* |
| 8014 | * We can use the underlying file's filename if: |
| 8015 | * - it has a filename, |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8016 | * - the current BDS is not a filter, |
Max Reitz | fb695c7 | 2019-02-01 20:29:29 +0100 | [diff] [blame] | 8017 | * - the file is a protocol BDS, and |
| 8018 | * - opening that file (as this BDS's format) will automatically create |
| 8019 | * the BDS tree we have right now, that is: |
| 8020 | * - the user did not significantly change this BDS's behavior with |
| 8021 | * some explicit (strong) options |
| 8022 | * - no non-file child of this BDS has been overridden by the user |
| 8023 | * Both of these conditions are represented by generate_json_filename. |
| 8024 | */ |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8025 | if (primary_child_bs->exact_filename[0] && |
| 8026 | primary_child_bs->drv->bdrv_file_open && |
| 8027 | !drv->is_filter && !generate_json_filename) |
Max Reitz | fb695c7 | 2019-02-01 20:29:29 +0100 | [diff] [blame] | 8028 | { |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8029 | strcpy(bs->exact_filename, primary_child_bs->exact_filename); |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 8030 | } |
| 8031 | } |
| 8032 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 8033 | if (bs->exact_filename[0]) { |
| 8034 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 8035 | } else { |
Markus Armbruster | eab3a46 | 2020-12-11 18:11:37 +0100 | [diff] [blame] | 8036 | GString *json = qobject_to_json(QOBJECT(bs->full_open_options)); |
Eric Blake | 5c86bdf | 2020-06-08 13:26:38 -0500 | [diff] [blame] | 8037 | if (snprintf(bs->filename, sizeof(bs->filename), "json:%s", |
Markus Armbruster | eab3a46 | 2020-12-11 18:11:37 +0100 | [diff] [blame] | 8038 | json->str) >= sizeof(bs->filename)) { |
Eric Blake | 5c86bdf | 2020-06-08 13:26:38 -0500 | [diff] [blame] | 8039 | /* Give user a hint if we truncated things. */ |
| 8040 | strcpy(bs->filename + sizeof(bs->filename) - 4, "..."); |
| 8041 | } |
Markus Armbruster | eab3a46 | 2020-12-11 18:11:37 +0100 | [diff] [blame] | 8042 | g_string_free(json, true); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 8043 | } |
| 8044 | } |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8045 | |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 8046 | char *bdrv_dirname(BlockDriverState *bs, Error **errp) |
| 8047 | { |
| 8048 | BlockDriver *drv = bs->drv; |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8049 | BlockDriverState *child_bs; |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 8050 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 8051 | GLOBAL_STATE_CODE(); |
| 8052 | |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 8053 | if (!drv) { |
| 8054 | error_setg(errp, "Node '%s' is ejected", bs->node_name); |
| 8055 | return NULL; |
| 8056 | } |
| 8057 | |
| 8058 | if (drv->bdrv_dirname) { |
| 8059 | return drv->bdrv_dirname(bs, errp); |
| 8060 | } |
| 8061 | |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8062 | child_bs = bdrv_primary_bs(bs); |
| 8063 | if (child_bs) { |
| 8064 | return bdrv_dirname(child_bs, errp); |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 8065 | } |
| 8066 | |
| 8067 | bdrv_refresh_filename(bs); |
| 8068 | if (bs->exact_filename[0] != '\0') { |
| 8069 | return path_combine(bs->exact_filename, ""); |
| 8070 | } |
| 8071 | |
| 8072 | error_setg(errp, "Cannot generate a base directory for %s nodes", |
| 8073 | drv->format_name); |
| 8074 | return NULL; |
| 8075 | } |
| 8076 | |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8077 | /* |
| 8078 | * Hot add/remove a BDS's child. So the user can take a child offline when |
| 8079 | * it is broken and take a new child online |
| 8080 | */ |
| 8081 | void bdrv_add_child(BlockDriverState *parent_bs, BlockDriverState *child_bs, |
| 8082 | Error **errp) |
| 8083 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 8084 | GLOBAL_STATE_CODE(); |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8085 | if (!parent_bs->drv || !parent_bs->drv->bdrv_add_child) { |
| 8086 | error_setg(errp, "The node %s does not support adding a child", |
| 8087 | bdrv_get_device_or_node_name(parent_bs)); |
| 8088 | return; |
| 8089 | } |
| 8090 | |
Sam Li | 774c726 | 2023-05-08 12:55:30 +0800 | [diff] [blame] | 8091 | /* |
| 8092 | * Non-zoned block drivers do not follow zoned storage constraints |
| 8093 | * (i.e. sequential writes to zones). Refuse mixing zoned and non-zoned |
| 8094 | * drivers in a graph. |
| 8095 | */ |
| 8096 | if (!parent_bs->drv->supports_zoned_children && |
| 8097 | child_bs->bl.zoned == BLK_Z_HM) { |
| 8098 | /* |
| 8099 | * The host-aware model allows zoned storage constraints and random |
| 8100 | * write. Allow mixing host-aware and non-zoned drivers. Using |
| 8101 | * host-aware device as a regular device. |
| 8102 | */ |
| 8103 | error_setg(errp, "Cannot add a %s child to a %s parent", |
| 8104 | child_bs->bl.zoned == BLK_Z_HM ? "zoned" : "non-zoned", |
| 8105 | parent_bs->drv->supports_zoned_children ? |
| 8106 | "support zoned children" : "not support zoned children"); |
| 8107 | return; |
| 8108 | } |
| 8109 | |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8110 | if (!QLIST_EMPTY(&child_bs->parents)) { |
| 8111 | error_setg(errp, "The node %s already has a parent", |
| 8112 | child_bs->node_name); |
| 8113 | return; |
| 8114 | } |
| 8115 | |
| 8116 | parent_bs->drv->bdrv_add_child(parent_bs, child_bs, errp); |
| 8117 | } |
| 8118 | |
| 8119 | void bdrv_del_child(BlockDriverState *parent_bs, BdrvChild *child, Error **errp) |
| 8120 | { |
| 8121 | BdrvChild *tmp; |
| 8122 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 8123 | GLOBAL_STATE_CODE(); |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8124 | if (!parent_bs->drv || !parent_bs->drv->bdrv_del_child) { |
| 8125 | error_setg(errp, "The node %s does not support removing a child", |
| 8126 | bdrv_get_device_or_node_name(parent_bs)); |
| 8127 | return; |
| 8128 | } |
| 8129 | |
| 8130 | QLIST_FOREACH(tmp, &parent_bs->children, next) { |
| 8131 | if (tmp == child) { |
| 8132 | break; |
| 8133 | } |
| 8134 | } |
| 8135 | |
| 8136 | if (!tmp) { |
| 8137 | error_setg(errp, "The node %s does not have a child named %s", |
| 8138 | bdrv_get_device_or_node_name(parent_bs), |
| 8139 | bdrv_get_device_or_node_name(child->bs)); |
| 8140 | return; |
| 8141 | } |
| 8142 | |
| 8143 | parent_bs->drv->bdrv_del_child(parent_bs, child, errp); |
| 8144 | } |
Max Reitz | 6f7a3b5 | 2020-04-29 16:11:23 +0200 | [diff] [blame] | 8145 | |
| 8146 | int bdrv_make_empty(BdrvChild *c, Error **errp) |
| 8147 | { |
| 8148 | BlockDriver *drv = c->bs->drv; |
| 8149 | int ret; |
| 8150 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 8151 | GLOBAL_STATE_CODE(); |
Max Reitz | 6f7a3b5 | 2020-04-29 16:11:23 +0200 | [diff] [blame] | 8152 | assert(c->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)); |
| 8153 | |
| 8154 | if (!drv->bdrv_make_empty) { |
| 8155 | error_setg(errp, "%s does not support emptying nodes", |
| 8156 | drv->format_name); |
| 8157 | return -ENOTSUP; |
| 8158 | } |
| 8159 | |
| 8160 | ret = drv->bdrv_make_empty(c->bs); |
| 8161 | if (ret < 0) { |
| 8162 | error_setg_errno(errp, -ret, "Failed to empty %s", |
| 8163 | c->bs->filename); |
| 8164 | return ret; |
| 8165 | } |
| 8166 | |
| 8167 | return 0; |
| 8168 | } |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8169 | |
| 8170 | /* |
| 8171 | * Return the child that @bs acts as an overlay for, and from which data may be |
| 8172 | * copied in COW or COR operations. Usually this is the backing file. |
| 8173 | */ |
| 8174 | BdrvChild *bdrv_cow_child(BlockDriverState *bs) |
| 8175 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8176 | IO_CODE(); |
| 8177 | |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8178 | if (!bs || !bs->drv) { |
| 8179 | return NULL; |
| 8180 | } |
| 8181 | |
| 8182 | if (bs->drv->is_filter) { |
| 8183 | return NULL; |
| 8184 | } |
| 8185 | |
| 8186 | if (!bs->backing) { |
| 8187 | return NULL; |
| 8188 | } |
| 8189 | |
| 8190 | assert(bs->backing->role & BDRV_CHILD_COW); |
| 8191 | return bs->backing; |
| 8192 | } |
| 8193 | |
| 8194 | /* |
| 8195 | * If @bs acts as a filter for exactly one of its children, return |
| 8196 | * that child. |
| 8197 | */ |
| 8198 | BdrvChild *bdrv_filter_child(BlockDriverState *bs) |
| 8199 | { |
| 8200 | BdrvChild *c; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8201 | IO_CODE(); |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8202 | |
| 8203 | if (!bs || !bs->drv) { |
| 8204 | return NULL; |
| 8205 | } |
| 8206 | |
| 8207 | if (!bs->drv->is_filter) { |
| 8208 | return NULL; |
| 8209 | } |
| 8210 | |
| 8211 | /* Only one of @backing or @file may be used */ |
| 8212 | assert(!(bs->backing && bs->file)); |
| 8213 | |
| 8214 | c = bs->backing ?: bs->file; |
| 8215 | if (!c) { |
| 8216 | return NULL; |
| 8217 | } |
| 8218 | |
| 8219 | assert(c->role & BDRV_CHILD_FILTERED); |
| 8220 | return c; |
| 8221 | } |
| 8222 | |
| 8223 | /* |
| 8224 | * Return either the result of bdrv_cow_child() or bdrv_filter_child(), |
| 8225 | * whichever is non-NULL. |
| 8226 | * |
| 8227 | * Return NULL if both are NULL. |
| 8228 | */ |
| 8229 | BdrvChild *bdrv_filter_or_cow_child(BlockDriverState *bs) |
| 8230 | { |
| 8231 | BdrvChild *cow_child = bdrv_cow_child(bs); |
| 8232 | BdrvChild *filter_child = bdrv_filter_child(bs); |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8233 | IO_CODE(); |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8234 | |
| 8235 | /* Filter nodes cannot have COW backing files */ |
| 8236 | assert(!(cow_child && filter_child)); |
| 8237 | |
| 8238 | return cow_child ?: filter_child; |
| 8239 | } |
| 8240 | |
| 8241 | /* |
| 8242 | * Return the primary child of this node: For filters, that is the |
| 8243 | * filtered child. For other nodes, that is usually the child storing |
| 8244 | * metadata. |
| 8245 | * (A generally more helpful description is that this is (usually) the |
| 8246 | * child that has the same filename as @bs.) |
| 8247 | * |
| 8248 | * Drivers do not necessarily have a primary child; for example quorum |
| 8249 | * does not. |
| 8250 | */ |
| 8251 | BdrvChild *bdrv_primary_child(BlockDriverState *bs) |
| 8252 | { |
| 8253 | BdrvChild *c, *found = NULL; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8254 | IO_CODE(); |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8255 | |
| 8256 | QLIST_FOREACH(c, &bs->children, next) { |
| 8257 | if (c->role & BDRV_CHILD_PRIMARY) { |
| 8258 | assert(!found); |
| 8259 | found = c; |
| 8260 | } |
| 8261 | } |
| 8262 | |
| 8263 | return found; |
| 8264 | } |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8265 | |
Kevin Wolf | ec82cc4 | 2023-10-27 17:53:20 +0200 | [diff] [blame] | 8266 | static BlockDriverState * GRAPH_RDLOCK |
| 8267 | bdrv_do_skip_filters(BlockDriverState *bs, bool stop_on_explicit_filter) |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8268 | { |
| 8269 | BdrvChild *c; |
| 8270 | |
| 8271 | if (!bs) { |
| 8272 | return NULL; |
| 8273 | } |
| 8274 | |
| 8275 | while (!(stop_on_explicit_filter && !bs->implicit)) { |
| 8276 | c = bdrv_filter_child(bs); |
| 8277 | if (!c) { |
| 8278 | /* |
| 8279 | * A filter that is embedded in a working block graph must |
| 8280 | * have a child. Assert this here so this function does |
| 8281 | * not return a filter node that is not expected by the |
| 8282 | * caller. |
| 8283 | */ |
| 8284 | assert(!bs->drv || !bs->drv->is_filter); |
| 8285 | break; |
| 8286 | } |
| 8287 | bs = c->bs; |
| 8288 | } |
| 8289 | /* |
| 8290 | * Note that this treats nodes with bs->drv == NULL as not being |
| 8291 | * filters (bs->drv == NULL should be replaced by something else |
| 8292 | * anyway). |
| 8293 | * The advantage of this behavior is that this function will thus |
| 8294 | * always return a non-NULL value (given a non-NULL @bs). |
| 8295 | */ |
| 8296 | |
| 8297 | return bs; |
| 8298 | } |
| 8299 | |
| 8300 | /* |
| 8301 | * Return the first BDS that has not been added implicitly or that |
| 8302 | * does not have a filtered child down the chain starting from @bs |
| 8303 | * (including @bs itself). |
| 8304 | */ |
| 8305 | BlockDriverState *bdrv_skip_implicit_filters(BlockDriverState *bs) |
| 8306 | { |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 8307 | GLOBAL_STATE_CODE(); |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8308 | return bdrv_do_skip_filters(bs, true); |
| 8309 | } |
| 8310 | |
| 8311 | /* |
| 8312 | * Return the first BDS that does not have a filtered child down the |
| 8313 | * chain starting from @bs (including @bs itself). |
| 8314 | */ |
| 8315 | BlockDriverState *bdrv_skip_filters(BlockDriverState *bs) |
| 8316 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8317 | IO_CODE(); |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8318 | return bdrv_do_skip_filters(bs, false); |
| 8319 | } |
| 8320 | |
| 8321 | /* |
| 8322 | * For a backing chain, return the first non-filter backing image of |
| 8323 | * the first non-filter image. |
| 8324 | */ |
| 8325 | BlockDriverState *bdrv_backing_chain_next(BlockDriverState *bs) |
| 8326 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8327 | IO_CODE(); |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8328 | return bdrv_skip_filters(bdrv_cow_bs(bdrv_skip_filters(bs))); |
| 8329 | } |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8330 | |
| 8331 | /** |
| 8332 | * Check whether [offset, offset + bytes) overlaps with the cached |
| 8333 | * block-status data region. |
| 8334 | * |
| 8335 | * If so, and @pnum is not NULL, set *pnum to `bsc.data_end - offset`, |
| 8336 | * which is what bdrv_bsc_is_data()'s interface needs. |
| 8337 | * Otherwise, *pnum is not touched. |
| 8338 | */ |
| 8339 | static bool bdrv_bsc_range_overlaps_locked(BlockDriverState *bs, |
| 8340 | int64_t offset, int64_t bytes, |
| 8341 | int64_t *pnum) |
| 8342 | { |
| 8343 | BdrvBlockStatusCache *bsc = qatomic_rcu_read(&bs->block_status_cache); |
| 8344 | bool overlaps; |
| 8345 | |
| 8346 | overlaps = |
| 8347 | qatomic_read(&bsc->valid) && |
| 8348 | ranges_overlap(offset, bytes, bsc->data_start, |
| 8349 | bsc->data_end - bsc->data_start); |
| 8350 | |
| 8351 | if (overlaps && pnum) { |
| 8352 | *pnum = bsc->data_end - offset; |
| 8353 | } |
| 8354 | |
| 8355 | return overlaps; |
| 8356 | } |
| 8357 | |
| 8358 | /** |
| 8359 | * See block_int.h for this function's documentation. |
| 8360 | */ |
| 8361 | bool bdrv_bsc_is_data(BlockDriverState *bs, int64_t offset, int64_t *pnum) |
| 8362 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8363 | IO_CODE(); |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8364 | RCU_READ_LOCK_GUARD(); |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8365 | return bdrv_bsc_range_overlaps_locked(bs, offset, 1, pnum); |
| 8366 | } |
| 8367 | |
| 8368 | /** |
| 8369 | * See block_int.h for this function's documentation. |
| 8370 | */ |
| 8371 | void bdrv_bsc_invalidate_range(BlockDriverState *bs, |
| 8372 | int64_t offset, int64_t bytes) |
| 8373 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8374 | IO_CODE(); |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8375 | RCU_READ_LOCK_GUARD(); |
| 8376 | |
| 8377 | if (bdrv_bsc_range_overlaps_locked(bs, offset, bytes, NULL)) { |
| 8378 | qatomic_set(&bs->block_status_cache->valid, false); |
| 8379 | } |
| 8380 | } |
| 8381 | |
| 8382 | /** |
| 8383 | * See block_int.h for this function's documentation. |
| 8384 | */ |
| 8385 | void bdrv_bsc_fill(BlockDriverState *bs, int64_t offset, int64_t bytes) |
| 8386 | { |
| 8387 | BdrvBlockStatusCache *new_bsc = g_new(BdrvBlockStatusCache, 1); |
| 8388 | BdrvBlockStatusCache *old_bsc; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8389 | IO_CODE(); |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8390 | |
| 8391 | *new_bsc = (BdrvBlockStatusCache) { |
| 8392 | .valid = true, |
| 8393 | .data_start = offset, |
| 8394 | .data_end = offset + bytes, |
| 8395 | }; |
| 8396 | |
| 8397 | QEMU_LOCK_GUARD(&bs->bsc_modify_lock); |
| 8398 | |
| 8399 | old_bsc = qatomic_rcu_read(&bs->block_status_cache); |
| 8400 | qatomic_rcu_set(&bs->block_status_cache, new_bsc); |
| 8401 | if (old_bsc) { |
| 8402 | g_free_rcu(old_bsc, rcu); |
| 8403 | } |
| 8404 | } |