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 | |
Vladimir Sementsov-Ogievskiy | 544acc7 | 2022-07-26 23:11:31 +0300 | [diff] [blame] | 94 | static void bdrv_replace_child_noperm(BdrvChild *child, |
Vladimir Sementsov-Ogievskiy | 4eba825 | 2022-07-26 23:11:28 +0300 | [diff] [blame] | 95 | BlockDriverState *new_bs); |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 96 | static void bdrv_remove_child(BdrvChild *child, Transaction *tran); |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 97 | |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 98 | static int bdrv_reopen_prepare(BDRVReopenState *reopen_state, |
| 99 | BlockReopenQueue *queue, |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 100 | Transaction *change_child_tran, Error **errp); |
Vladimir Sementsov-Ogievskiy | 53e96d1 | 2021-04-28 18:17:35 +0300 | [diff] [blame] | 101 | static void bdrv_reopen_commit(BDRVReopenState *reopen_state); |
| 102 | static void bdrv_reopen_abort(BDRVReopenState *reopen_state); |
| 103 | |
Emanuele Giuseppe Esposito | fa8fc1d | 2021-12-15 07:11:38 -0500 | [diff] [blame] | 104 | static bool bdrv_backing_overridden(BlockDriverState *bs); |
| 105 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 106 | static bool bdrv_change_aio_context(BlockDriverState *bs, AioContext *ctx, |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 107 | GHashTable *visited, Transaction *tran, |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 108 | Error **errp); |
| 109 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 110 | /* If non-zero, use only whitelisted block drivers */ |
| 111 | static int use_bdrv_whitelist; |
| 112 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 113 | #ifdef _WIN32 |
| 114 | static int is_windows_drive_prefix(const char *filename) |
| 115 | { |
| 116 | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 117 | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 118 | filename[1] == ':'); |
| 119 | } |
| 120 | |
| 121 | int is_windows_drive(const char *filename) |
| 122 | { |
| 123 | if (is_windows_drive_prefix(filename) && |
| 124 | filename[2] == '\0') |
| 125 | return 1; |
| 126 | if (strstart(filename, "\\\\.\\", NULL) || |
| 127 | strstart(filename, "//./", NULL)) |
| 128 | return 1; |
| 129 | return 0; |
| 130 | } |
| 131 | #endif |
| 132 | |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 133 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
| 134 | { |
| 135 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 136 | /* 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] | 137 | return MAX(4096, qemu_real_host_page_size()); |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 138 | } |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 139 | IO_CODE(); |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 140 | |
| 141 | return bs->bl.opt_mem_alignment; |
| 142 | } |
| 143 | |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 144 | size_t bdrv_min_mem_align(BlockDriverState *bs) |
| 145 | { |
| 146 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 147 | /* 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] | 148 | return MAX(4096, qemu_real_host_page_size()); |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 149 | } |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 150 | IO_CODE(); |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 151 | |
| 152 | return bs->bl.min_mem_alignment; |
| 153 | } |
| 154 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 155 | /* check if the path starts with "<protocol>:" */ |
Max Reitz | 5c98415 | 2014-12-03 14:57:22 +0100 | [diff] [blame] | 156 | int path_has_protocol(const char *path) |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 157 | { |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 158 | const char *p; |
| 159 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 160 | #ifdef _WIN32 |
| 161 | if (is_windows_drive(path) || |
| 162 | is_windows_drive_prefix(path)) { |
| 163 | return 0; |
| 164 | } |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 165 | p = path + strcspn(path, ":/\\"); |
| 166 | #else |
| 167 | p = path + strcspn(path, ":/"); |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 168 | #endif |
| 169 | |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 170 | return *p == ':'; |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 171 | } |
| 172 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 173 | int path_is_absolute(const char *path) |
| 174 | { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 175 | #ifdef _WIN32 |
| 176 | /* specific case for names like: "\\.\d:" */ |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 177 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 178 | return 1; |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 179 | } |
| 180 | return (*path == '/' || *path == '\\'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 181 | #else |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 182 | return (*path == '/'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 183 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 184 | } |
| 185 | |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 186 | /* if filename is absolute, just return its duplicate. Otherwise, build a |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 187 | path to it by considering it is relative to base_path. URL are |
| 188 | supported. */ |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 189 | char *path_combine(const char *base_path, const char *filename) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 190 | { |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 191 | const char *protocol_stripped = NULL; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 192 | const char *p, *p1; |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 193 | char *result; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 194 | int len; |
| 195 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 196 | if (path_is_absolute(filename)) { |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 197 | return g_strdup(filename); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 198 | } |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 199 | |
| 200 | if (path_has_protocol(base_path)) { |
| 201 | protocol_stripped = strchr(base_path, ':'); |
| 202 | if (protocol_stripped) { |
| 203 | protocol_stripped++; |
| 204 | } |
| 205 | } |
| 206 | p = protocol_stripped ?: base_path; |
| 207 | |
| 208 | p1 = strrchr(base_path, '/'); |
| 209 | #ifdef _WIN32 |
| 210 | { |
| 211 | const char *p2; |
| 212 | p2 = strrchr(base_path, '\\'); |
| 213 | if (!p1 || p2 > p1) { |
| 214 | p1 = p2; |
| 215 | } |
| 216 | } |
| 217 | #endif |
| 218 | if (p1) { |
| 219 | p1++; |
| 220 | } else { |
| 221 | p1 = base_path; |
| 222 | } |
| 223 | if (p1 > p) { |
| 224 | p = p1; |
| 225 | } |
| 226 | len = p - base_path; |
| 227 | |
| 228 | result = g_malloc(len + strlen(filename) + 1); |
| 229 | memcpy(result, base_path, len); |
| 230 | strcpy(result + len, filename); |
| 231 | |
| 232 | return result; |
| 233 | } |
| 234 | |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 235 | /* |
| 236 | * Helper function for bdrv_parse_filename() implementations to remove optional |
| 237 | * protocol prefixes (especially "file:") from a filename and for putting the |
| 238 | * stripped filename into the options QDict if there is such a prefix. |
| 239 | */ |
| 240 | void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix, |
| 241 | QDict *options) |
| 242 | { |
| 243 | if (strstart(filename, prefix, &filename)) { |
| 244 | /* Stripping the explicit protocol prefix may result in a protocol |
| 245 | * prefix being (wrongly) detected (if the filename contains a colon) */ |
| 246 | if (path_has_protocol(filename)) { |
Markus Armbruster | 18cf67c | 2020-12-11 18:11:51 +0100 | [diff] [blame] | 247 | GString *fat_filename; |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 248 | |
| 249 | /* This means there is some colon before the first slash; therefore, |
| 250 | * this cannot be an absolute path */ |
| 251 | assert(!path_is_absolute(filename)); |
| 252 | |
| 253 | /* And we can thus fix the protocol detection issue by prefixing it |
| 254 | * by "./" */ |
Markus Armbruster | 18cf67c | 2020-12-11 18:11:51 +0100 | [diff] [blame] | 255 | fat_filename = g_string_new("./"); |
| 256 | g_string_append(fat_filename, filename); |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 257 | |
Markus Armbruster | 18cf67c | 2020-12-11 18:11:51 +0100 | [diff] [blame] | 258 | assert(!path_has_protocol(fat_filename->str)); |
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 | qdict_put(options, "filename", |
| 261 | qstring_from_gstring(fat_filename)); |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 262 | } else { |
| 263 | /* If no protocol prefix was detected, we can use the shortened |
| 264 | * filename as-is */ |
| 265 | qdict_put_str(options, "filename", filename); |
| 266 | } |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 271 | /* Returns whether the image file is opened as read-only. Note that this can |
| 272 | * return false and writing to the image file is still not possible because the |
| 273 | * image is inactivated. */ |
Jeff Cody | 93ed524 | 2017-04-07 16:55:28 -0400 | [diff] [blame] | 274 | bool bdrv_is_read_only(BlockDriverState *bs) |
| 275 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 276 | IO_CODE(); |
Vladimir Sementsov-Ogievskiy | 975da07 | 2021-05-27 18:40:55 +0300 | [diff] [blame] | 277 | return !(bs->open_flags & BDRV_O_RDWR); |
Jeff Cody | 93ed524 | 2017-04-07 16:55:28 -0400 | [diff] [blame] | 278 | } |
| 279 | |
Kevin Wolf | 10e5d70 | 2023-02-03 16:21:40 +0100 | [diff] [blame] | 280 | static int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, |
| 281 | bool ignore_allow_rdw, Error **errp) |
Jeff Cody | fe5241b | 2017-04-07 16:55:25 -0400 | [diff] [blame] | 282 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 283 | IO_CODE(); |
| 284 | |
Jeff Cody | e2b8247 | 2017-04-07 16:55:26 -0400 | [diff] [blame] | 285 | /* Do not set read_only if copy_on_read is enabled */ |
| 286 | if (bs->copy_on_read && read_only) { |
| 287 | error_setg(errp, "Can't set node '%s' to r/o with copy-on-read enabled", |
| 288 | bdrv_get_device_or_node_name(bs)); |
| 289 | return -EINVAL; |
| 290 | } |
| 291 | |
Jeff Cody | d6fcdf0 | 2017-04-07 16:55:27 -0400 | [diff] [blame] | 292 | /* Do not clear read_only if it is prohibited */ |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 293 | if (!read_only && !(bs->open_flags & BDRV_O_ALLOW_RDWR) && |
| 294 | !ignore_allow_rdw) |
| 295 | { |
Jeff Cody | d6fcdf0 | 2017-04-07 16:55:27 -0400 | [diff] [blame] | 296 | error_setg(errp, "Node '%s' is read only", |
| 297 | bdrv_get_device_or_node_name(bs)); |
| 298 | return -EPERM; |
| 299 | } |
| 300 | |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 301 | return 0; |
| 302 | } |
| 303 | |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 304 | /* |
| 305 | * Called by a driver that can only provide a read-only image. |
| 306 | * |
| 307 | * Returns 0 if the node is already read-only or it could switch the node to |
| 308 | * read-only because BDRV_O_AUTO_RDONLY is set. |
| 309 | * |
| 310 | * Returns -EACCES if the node is read-write and BDRV_O_AUTO_RDONLY is not set |
| 311 | * or bdrv_can_set_read_only() forbids making the node read-only. If @errmsg |
| 312 | * is not NULL, it is used as the error message for the Error object. |
| 313 | */ |
| 314 | int bdrv_apply_auto_read_only(BlockDriverState *bs, const char *errmsg, |
| 315 | Error **errp) |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 316 | { |
| 317 | int ret = 0; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 318 | IO_CODE(); |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 319 | |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 320 | if (!(bs->open_flags & BDRV_O_RDWR)) { |
| 321 | return 0; |
| 322 | } |
| 323 | if (!(bs->open_flags & BDRV_O_AUTO_RDONLY)) { |
| 324 | goto fail; |
| 325 | } |
| 326 | |
| 327 | ret = bdrv_can_set_read_only(bs, true, false, NULL); |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 328 | if (ret < 0) { |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 329 | goto fail; |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 330 | } |
| 331 | |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 332 | bs->open_flags &= ~BDRV_O_RDWR; |
Kevin Wolf | eeae6a5 | 2018-10-09 16:57:12 +0200 | [diff] [blame] | 333 | |
Jeff Cody | e2b8247 | 2017-04-07 16:55:26 -0400 | [diff] [blame] | 334 | return 0; |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 335 | |
| 336 | fail: |
| 337 | error_setg(errp, "%s", errmsg ?: "Image is read-only"); |
| 338 | return -EACCES; |
Jeff Cody | fe5241b | 2017-04-07 16:55:25 -0400 | [diff] [blame] | 339 | } |
| 340 | |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 341 | /* |
| 342 | * If @backing is empty, this function returns NULL without setting |
| 343 | * @errp. In all other cases, NULL will only be returned with @errp |
| 344 | * set. |
| 345 | * |
| 346 | * Therefore, a return value of NULL without @errp set means that |
| 347 | * there is no backing file; if @errp is set, there is one but its |
| 348 | * absolute filename cannot be generated. |
| 349 | */ |
| 350 | char *bdrv_get_full_backing_filename_from_filename(const char *backed, |
| 351 | const char *backing, |
| 352 | Error **errp) |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 353 | { |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 354 | if (backing[0] == '\0') { |
| 355 | return NULL; |
| 356 | } else if (path_has_protocol(backing) || path_is_absolute(backing)) { |
| 357 | return g_strdup(backing); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 358 | } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) { |
| 359 | error_setg(errp, "Cannot use relative backing file names for '%s'", |
| 360 | backed); |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 361 | return NULL; |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 362 | } else { |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 363 | return path_combine(backed, backing); |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 364 | } |
| 365 | } |
| 366 | |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 367 | /* |
| 368 | * If @filename is empty or NULL, this function returns NULL without |
| 369 | * setting @errp. In all other cases, NULL will only be returned with |
| 370 | * @errp set. |
| 371 | */ |
| 372 | static char *bdrv_make_absolute_filename(BlockDriverState *relative_to, |
| 373 | const char *filename, Error **errp) |
| 374 | { |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 375 | char *dir, *full_name; |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 376 | |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 377 | if (!filename || filename[0] == '\0') { |
| 378 | return NULL; |
| 379 | } else if (path_has_protocol(filename) || path_is_absolute(filename)) { |
| 380 | return g_strdup(filename); |
| 381 | } |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 382 | |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 383 | dir = bdrv_dirname(relative_to, errp); |
| 384 | if (!dir) { |
| 385 | return NULL; |
| 386 | } |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 387 | |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 388 | full_name = g_strconcat(dir, filename, NULL); |
| 389 | g_free(dir); |
| 390 | return full_name; |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 391 | } |
| 392 | |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 393 | char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp) |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 394 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 395 | GLOBAL_STATE_CODE(); |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 396 | return bdrv_make_absolute_filename(bs, bs->backing_file, errp); |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 397 | } |
| 398 | |
Stefan Hajnoczi | 0eb7217 | 2015-04-28 14:27:51 +0100 | [diff] [blame] | 399 | void bdrv_register(BlockDriver *bdrv) |
| 400 | { |
Philippe Mathieu-Daudé | a15f08d | 2020-03-18 23:22:35 +0100 | [diff] [blame] | 401 | assert(bdrv->format_name); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 402 | GLOBAL_STATE_CODE(); |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 403 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 404 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 405 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 406 | BlockDriverState *bdrv_new(void) |
| 407 | { |
| 408 | BlockDriverState *bs; |
| 409 | int i; |
| 410 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 411 | GLOBAL_STATE_CODE(); |
| 412 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 413 | bs = g_new0(BlockDriverState, 1); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 414 | QLIST_INIT(&bs->dirty_bitmaps); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 415 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 416 | QLIST_INIT(&bs->op_blockers[i]); |
| 417 | } |
Paolo Bonzini | 3783fa3 | 2017-06-05 14:39:02 +0200 | [diff] [blame] | 418 | qemu_co_mutex_init(&bs->reqs_lock); |
Paolo Bonzini | 2119882 | 2017-06-05 14:39:03 +0200 | [diff] [blame] | 419 | qemu_mutex_init(&bs->dirty_bitmap_mutex); |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 420 | bs->refcnt = 1; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 421 | bs->aio_context = qemu_get_aio_context(); |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 422 | |
Evgeny Yakovlev | 3ff2f67 | 2016-07-18 22:39:52 +0300 | [diff] [blame] | 423 | qemu_co_queue_init(&bs->flush_queue); |
| 424 | |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 425 | qemu_co_mutex_init(&bs->bsc_modify_lock); |
| 426 | bs->block_status_cache = g_new0(BdrvBlockStatusCache, 1); |
| 427 | |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 428 | for (i = 0; i < bdrv_drain_all_count; i++) { |
| 429 | bdrv_drained_begin(bs); |
| 430 | } |
| 431 | |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 432 | QTAILQ_INSERT_TAIL(&all_bdrv_states, bs, bs_list); |
| 433 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 434 | return bs; |
| 435 | } |
| 436 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 437 | static BlockDriver *bdrv_do_find_format(const char *format_name) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 438 | { |
| 439 | BlockDriver *drv1; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 440 | GLOBAL_STATE_CODE(); |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 441 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 442 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 443 | if (!strcmp(drv1->format_name, format_name)) { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 444 | return drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 445 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 446 | } |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 447 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 448 | return NULL; |
| 449 | } |
| 450 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 451 | BlockDriver *bdrv_find_format(const char *format_name) |
| 452 | { |
| 453 | BlockDriver *drv1; |
| 454 | int i; |
| 455 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 456 | GLOBAL_STATE_CODE(); |
| 457 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 458 | drv1 = bdrv_do_find_format(format_name); |
| 459 | if (drv1) { |
| 460 | return drv1; |
| 461 | } |
| 462 | |
| 463 | /* The driver isn't registered, maybe we need to load a module */ |
| 464 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { |
| 465 | if (!strcmp(block_driver_modules[i].format_name, format_name)) { |
Claudio Fontana | c551fb0 | 2022-09-29 11:30:33 +0200 | [diff] [blame] | 466 | Error *local_err = NULL; |
| 467 | int rv = block_module_load(block_driver_modules[i].library_name, |
| 468 | &local_err); |
| 469 | if (rv > 0) { |
| 470 | return bdrv_do_find_format(format_name); |
| 471 | } else if (rv < 0) { |
| 472 | error_report_err(local_err); |
| 473 | } |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 474 | break; |
| 475 | } |
| 476 | } |
Claudio Fontana | c551fb0 | 2022-09-29 11:30:33 +0200 | [diff] [blame] | 477 | return NULL; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 478 | } |
| 479 | |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 480 | 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] | 481 | { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 482 | static const char *whitelist_rw[] = { |
| 483 | CONFIG_BDRV_RW_WHITELIST |
Paolo Bonzini | 859aef0 | 2020-08-04 18:14:26 +0200 | [diff] [blame] | 484 | NULL |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 485 | }; |
| 486 | static const char *whitelist_ro[] = { |
| 487 | CONFIG_BDRV_RO_WHITELIST |
Paolo Bonzini | 859aef0 | 2020-08-04 18:14:26 +0200 | [diff] [blame] | 488 | NULL |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 489 | }; |
| 490 | const char **p; |
| 491 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 492 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 493 | return 1; /* no whitelist, anything goes */ |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 494 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 495 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 496 | for (p = whitelist_rw; *p; p++) { |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 497 | if (!strcmp(format_name, *p)) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 498 | return 1; |
| 499 | } |
| 500 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 501 | if (read_only) { |
| 502 | for (p = whitelist_ro; *p; p++) { |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 503 | if (!strcmp(format_name, *p)) { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 504 | return 1; |
| 505 | } |
| 506 | } |
| 507 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 508 | return 0; |
| 509 | } |
| 510 | |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 511 | int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
| 512 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 513 | GLOBAL_STATE_CODE(); |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 514 | return bdrv_format_is_whitelisted(drv->format_name, read_only); |
| 515 | } |
| 516 | |
Daniel P. Berrange | e6ff69b | 2016-03-21 14:11:48 +0000 | [diff] [blame] | 517 | bool bdrv_uses_whitelist(void) |
| 518 | { |
| 519 | return use_bdrv_whitelist; |
| 520 | } |
| 521 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 522 | typedef struct CreateCo { |
| 523 | BlockDriver *drv; |
| 524 | char *filename; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 525 | QemuOpts *opts; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 526 | int ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 527 | Error *err; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 528 | } CreateCo; |
| 529 | |
Emanuele Giuseppe Esposito | 741443e | 2022-11-28 09:23:36 -0500 | [diff] [blame] | 530 | int coroutine_fn bdrv_co_create(BlockDriver *drv, const char *filename, |
| 531 | QemuOpts *opts, Error **errp) |
Emanuele Giuseppe Esposito | 84bdf21 | 2022-11-28 09:23:30 -0500 | [diff] [blame] | 532 | { |
| 533 | int ret; |
| 534 | GLOBAL_STATE_CODE(); |
| 535 | ERRP_GUARD(); |
| 536 | |
| 537 | if (!drv->bdrv_co_create_opts) { |
| 538 | error_setg(errp, "Driver '%s' does not support image creation", |
| 539 | drv->format_name); |
| 540 | return -ENOTSUP; |
| 541 | } |
| 542 | |
| 543 | ret = drv->bdrv_co_create_opts(drv, filename, opts, errp); |
| 544 | if (ret < 0 && !*errp) { |
| 545 | error_setg_errno(errp, -ret, "Could not create image"); |
| 546 | } |
| 547 | |
| 548 | return ret; |
| 549 | } |
| 550 | |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 551 | /** |
| 552 | * Helper function for bdrv_create_file_fallback(): Resize @blk to at |
| 553 | * least the given @minimum_size. |
| 554 | * |
| 555 | * On success, return @blk's actual length. |
| 556 | * Otherwise, return -errno. |
| 557 | */ |
Paolo Bonzini | 84569a7 | 2023-06-01 13:51:38 +0200 | [diff] [blame] | 558 | static int64_t coroutine_fn GRAPH_UNLOCKED |
| 559 | create_file_fallback_truncate(BlockBackend *blk, int64_t minimum_size, |
| 560 | Error **errp) |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 561 | { |
| 562 | Error *local_err = NULL; |
| 563 | int64_t size; |
| 564 | int ret; |
| 565 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 566 | GLOBAL_STATE_CODE(); |
| 567 | |
Paolo Bonzini | 84569a7 | 2023-06-01 13:51:38 +0200 | [diff] [blame] | 568 | ret = blk_co_truncate(blk, minimum_size, false, PREALLOC_MODE_OFF, 0, |
| 569 | &local_err); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 570 | if (ret < 0 && ret != -ENOTSUP) { |
| 571 | error_propagate(errp, local_err); |
| 572 | return ret; |
| 573 | } |
| 574 | |
Paolo Bonzini | 84569a7 | 2023-06-01 13:51:38 +0200 | [diff] [blame] | 575 | size = blk_co_getlength(blk); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 576 | if (size < 0) { |
| 577 | error_free(local_err); |
| 578 | error_setg_errno(errp, -size, |
| 579 | "Failed to inquire the new image file's length"); |
| 580 | return size; |
| 581 | } |
| 582 | |
| 583 | if (size < minimum_size) { |
| 584 | /* Need to grow the image, but we failed to do that */ |
| 585 | error_propagate(errp, local_err); |
| 586 | return -ENOTSUP; |
| 587 | } |
| 588 | |
| 589 | error_free(local_err); |
| 590 | local_err = NULL; |
| 591 | |
| 592 | return size; |
| 593 | } |
| 594 | |
| 595 | /** |
| 596 | * Helper function for bdrv_create_file_fallback(): Zero the first |
| 597 | * sector to remove any potentially pre-existing image header. |
| 598 | */ |
Paolo Bonzini | 881a4c5 | 2022-09-22 10:49:00 +0200 | [diff] [blame] | 599 | static int coroutine_fn |
| 600 | create_file_fallback_zero_first_sector(BlockBackend *blk, |
| 601 | int64_t current_size, |
| 602 | Error **errp) |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 603 | { |
| 604 | int64_t bytes_to_clear; |
| 605 | int ret; |
| 606 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 607 | GLOBAL_STATE_CODE(); |
| 608 | |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 609 | bytes_to_clear = MIN(current_size, BDRV_SECTOR_SIZE); |
| 610 | if (bytes_to_clear) { |
Alberto Faria | ce47ff2 | 2022-10-13 14:37:02 +0200 | [diff] [blame] | 611 | 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] | 612 | if (ret < 0) { |
| 613 | error_setg_errno(errp, -ret, |
| 614 | "Failed to clear the new image's first sector"); |
| 615 | return ret; |
| 616 | } |
| 617 | } |
| 618 | |
| 619 | return 0; |
| 620 | } |
| 621 | |
Maxim Levitsky | 5a5e7f8 | 2020-03-26 03:12:18 +0200 | [diff] [blame] | 622 | /** |
| 623 | * Simple implementation of bdrv_co_create_opts for protocol drivers |
| 624 | * which only support creation via opening a file |
| 625 | * (usually existing raw storage device) |
| 626 | */ |
| 627 | int coroutine_fn bdrv_co_create_opts_simple(BlockDriver *drv, |
| 628 | const char *filename, |
| 629 | QemuOpts *opts, |
| 630 | Error **errp) |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 631 | { |
| 632 | BlockBackend *blk; |
Max Reitz | eeea1fa | 2020-02-25 16:56:18 +0100 | [diff] [blame] | 633 | QDict *options; |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 634 | int64_t size = 0; |
| 635 | char *buf = NULL; |
| 636 | PreallocMode prealloc; |
| 637 | Error *local_err = NULL; |
| 638 | int ret; |
| 639 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 640 | GLOBAL_STATE_CODE(); |
| 641 | |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 642 | size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); |
| 643 | buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); |
| 644 | prealloc = qapi_enum_parse(&PreallocMode_lookup, buf, |
| 645 | PREALLOC_MODE_OFF, &local_err); |
| 646 | g_free(buf); |
| 647 | if (local_err) { |
| 648 | error_propagate(errp, local_err); |
| 649 | return -EINVAL; |
| 650 | } |
| 651 | |
| 652 | if (prealloc != PREALLOC_MODE_OFF) { |
| 653 | error_setg(errp, "Unsupported preallocation mode '%s'", |
| 654 | PreallocMode_str(prealloc)); |
| 655 | return -ENOTSUP; |
| 656 | } |
| 657 | |
Max Reitz | eeea1fa | 2020-02-25 16:56:18 +0100 | [diff] [blame] | 658 | options = qdict_new(); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 659 | qdict_put_str(options, "driver", drv->format_name); |
| 660 | |
Kevin Wolf | be1a732 | 2023-01-26 18:24:31 +0100 | [diff] [blame] | 661 | blk = blk_co_new_open(filename, NULL, options, |
| 662 | BDRV_O_RDWR | BDRV_O_RESIZE, errp); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 663 | if (!blk) { |
| 664 | error_prepend(errp, "Protocol driver '%s' does not support image " |
| 665 | "creation, and opening the image failed: ", |
| 666 | drv->format_name); |
| 667 | return -EINVAL; |
| 668 | } |
| 669 | |
| 670 | size = create_file_fallback_truncate(blk, size, errp); |
| 671 | if (size < 0) { |
| 672 | ret = size; |
| 673 | goto out; |
| 674 | } |
| 675 | |
| 676 | ret = create_file_fallback_zero_first_sector(blk, size, errp); |
| 677 | if (ret < 0) { |
| 678 | goto out; |
| 679 | } |
| 680 | |
| 681 | ret = 0; |
| 682 | out: |
Kevin Wolf | b2ab5f5 | 2023-05-04 13:57:33 +0200 | [diff] [blame] | 683 | blk_co_unref(blk); |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 684 | return ret; |
| 685 | } |
| 686 | |
Emanuele Giuseppe Esposito | 2475a0d | 2022-11-28 09:23:31 -0500 | [diff] [blame] | 687 | int coroutine_fn bdrv_co_create_file(const char *filename, QemuOpts *opts, |
| 688 | Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 689 | { |
Stefano Garzarella | 729222a | 2021-03-08 17:12:32 +0100 | [diff] [blame] | 690 | QemuOpts *protocol_opts; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 691 | BlockDriver *drv; |
Stefano Garzarella | 729222a | 2021-03-08 17:12:32 +0100 | [diff] [blame] | 692 | QDict *qdict; |
| 693 | int ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 694 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 695 | GLOBAL_STATE_CODE(); |
| 696 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 697 | drv = bdrv_find_protocol(filename, true, errp); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 698 | if (drv == NULL) { |
Stefan Hajnoczi | 16905d7 | 2010-11-30 15:14:14 +0000 | [diff] [blame] | 699 | return -ENOENT; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 700 | } |
| 701 | |
Stefano Garzarella | 729222a | 2021-03-08 17:12:32 +0100 | [diff] [blame] | 702 | if (!drv->create_opts) { |
| 703 | error_setg(errp, "Driver '%s' does not support image creation", |
| 704 | drv->format_name); |
| 705 | return -ENOTSUP; |
| 706 | } |
| 707 | |
| 708 | /* |
| 709 | * 'opts' contains a QemuOptsList with a combination of format and protocol |
| 710 | * default values. |
| 711 | * |
| 712 | * The format properly removes its options, but the default values remain |
| 713 | * in 'opts->list'. So if the protocol has options with the same name |
| 714 | * (e.g. rbd has 'cluster_size' as qcow2), it will see the default values |
| 715 | * of the format, since for overlapping options, the format wins. |
| 716 | * |
| 717 | * To avoid this issue, lets convert QemuOpts to QDict, in this way we take |
| 718 | * only the set options, and then convert it back to QemuOpts, using the |
| 719 | * create_opts of the protocol. So the new QemuOpts, will contain only the |
| 720 | * protocol defaults. |
| 721 | */ |
| 722 | qdict = qemu_opts_to_qdict(opts, NULL); |
| 723 | protocol_opts = qemu_opts_from_qdict(drv->create_opts, qdict, errp); |
| 724 | if (protocol_opts == NULL) { |
| 725 | ret = -EINVAL; |
| 726 | goto out; |
| 727 | } |
| 728 | |
Emanuele Giuseppe Esposito | 2475a0d | 2022-11-28 09:23:31 -0500 | [diff] [blame] | 729 | ret = bdrv_co_create(drv, filename, protocol_opts, errp); |
Stefano Garzarella | 729222a | 2021-03-08 17:12:32 +0100 | [diff] [blame] | 730 | out: |
| 731 | qemu_opts_del(protocol_opts); |
| 732 | qobject_unref(qdict); |
| 733 | return ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 734 | } |
| 735 | |
Daniel Henrique Barboza | e1d7f8b | 2020-01-30 18:39:05 -0300 | [diff] [blame] | 736 | int coroutine_fn bdrv_co_delete_file(BlockDriverState *bs, Error **errp) |
| 737 | { |
| 738 | Error *local_err = NULL; |
| 739 | int ret; |
| 740 | |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 741 | IO_CODE(); |
Daniel Henrique Barboza | e1d7f8b | 2020-01-30 18:39:05 -0300 | [diff] [blame] | 742 | assert(bs != NULL); |
Kevin Wolf | 48aef79 | 2023-02-03 16:22:00 +0100 | [diff] [blame] | 743 | assert_bdrv_graph_readable(); |
Daniel Henrique Barboza | e1d7f8b | 2020-01-30 18:39:05 -0300 | [diff] [blame] | 744 | |
| 745 | if (!bs->drv) { |
| 746 | error_setg(errp, "Block node '%s' is not opened", bs->filename); |
| 747 | return -ENOMEDIUM; |
| 748 | } |
| 749 | |
| 750 | if (!bs->drv->bdrv_co_delete_file) { |
| 751 | error_setg(errp, "Driver '%s' does not support image deletion", |
| 752 | bs->drv->format_name); |
| 753 | return -ENOTSUP; |
| 754 | } |
| 755 | |
| 756 | ret = bs->drv->bdrv_co_delete_file(bs, &local_err); |
| 757 | if (ret < 0) { |
| 758 | error_propagate(errp, local_err); |
| 759 | } |
| 760 | |
| 761 | return ret; |
| 762 | } |
| 763 | |
Maxim Levitsky | a890f08 | 2020-12-17 19:09:03 +0200 | [diff] [blame] | 764 | void coroutine_fn bdrv_co_delete_file_noerr(BlockDriverState *bs) |
| 765 | { |
| 766 | Error *local_err = NULL; |
| 767 | int ret; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 768 | IO_CODE(); |
Maxim Levitsky | a890f08 | 2020-12-17 19:09:03 +0200 | [diff] [blame] | 769 | |
| 770 | if (!bs) { |
| 771 | return; |
| 772 | } |
| 773 | |
| 774 | ret = bdrv_co_delete_file(bs, &local_err); |
| 775 | /* |
| 776 | * ENOTSUP will happen if the block driver doesn't support |
| 777 | * the 'bdrv_co_delete_file' interface. This is a predictable |
| 778 | * scenario and shouldn't be reported back to the user. |
| 779 | */ |
| 780 | if (ret == -ENOTSUP) { |
| 781 | error_free(local_err); |
| 782 | } else if (ret < 0) { |
| 783 | error_report_err(local_err); |
| 784 | } |
| 785 | } |
| 786 | |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 787 | /** |
| 788 | * Try to get @bs's logical and physical block size. |
| 789 | * On success, store them in @bsz struct and return 0. |
| 790 | * On failure return -errno. |
| 791 | * @bs must not be empty. |
| 792 | */ |
| 793 | int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) |
| 794 | { |
| 795 | BlockDriver *drv = bs->drv; |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 796 | BlockDriverState *filtered = bdrv_filter_bs(bs); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 797 | GLOBAL_STATE_CODE(); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 798 | |
| 799 | if (drv && drv->bdrv_probe_blocksizes) { |
| 800 | return drv->bdrv_probe_blocksizes(bs, bsz); |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 801 | } else if (filtered) { |
| 802 | return bdrv_probe_blocksizes(filtered, bsz); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 803 | } |
| 804 | |
| 805 | return -ENOTSUP; |
| 806 | } |
| 807 | |
| 808 | /** |
| 809 | * Try to get @bs's geometry (cyls, heads, sectors). |
| 810 | * On success, store them in @geo struct and return 0. |
| 811 | * On failure return -errno. |
| 812 | * @bs must not be empty. |
| 813 | */ |
| 814 | int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo) |
| 815 | { |
| 816 | BlockDriver *drv = bs->drv; |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 817 | BlockDriverState *filtered = bdrv_filter_bs(bs); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 818 | GLOBAL_STATE_CODE(); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 819 | |
| 820 | if (drv && drv->bdrv_probe_geometry) { |
| 821 | return drv->bdrv_probe_geometry(bs, geo); |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 822 | } else if (filtered) { |
| 823 | return bdrv_probe_geometry(filtered, geo); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 824 | } |
| 825 | |
| 826 | return -ENOTSUP; |
| 827 | } |
| 828 | |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 829 | /* |
| 830 | * Create a uniquely-named empty temporary file. |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 831 | * Return the actual file name used upon success, otherwise NULL. |
| 832 | * This string should be freed with g_free() when not needed any longer. |
| 833 | * |
| 834 | * Note: creating a temporary file for the caller to (re)open is |
| 835 | * inherently racy. Use g_file_open_tmp() instead whenever practical. |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 836 | */ |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 837 | char *create_tmp_file(Error **errp) |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 838 | { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 839 | int fd; |
blueswir1 | 7ccfb2e | 2008-09-14 06:45:34 +0000 | [diff] [blame] | 840 | const char *tmpdir; |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 841 | g_autofree char *filename = NULL; |
| 842 | |
| 843 | tmpdir = g_get_tmp_dir(); |
| 844 | #ifndef _WIN32 |
| 845 | /* |
| 846 | * See commit 69bef79 ("block: use /var/tmp instead of /tmp for -snapshot") |
| 847 | * |
| 848 | * This function is used to create temporary disk images (like -snapshot), |
| 849 | * so the files can become very large. /tmp is often a tmpfs where as |
| 850 | * /var/tmp is usually on a disk, so more appropriate for disk images. |
| 851 | */ |
| 852 | if (!g_strcmp0(tmpdir, "/tmp")) { |
Amit Shah | 69bef79 | 2014-02-26 15:12:37 +0530 | [diff] [blame] | 853 | tmpdir = "/var/tmp"; |
| 854 | } |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 855 | #endif |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 856 | |
| 857 | filename = g_strdup_printf("%s/vl.XXXXXX", tmpdir); |
| 858 | fd = g_mkstemp(filename); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 859 | if (fd < 0) { |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 860 | error_setg_errno(errp, errno, "Could not open temporary file '%s'", |
| 861 | filename); |
| 862 | return NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 863 | } |
Bin Meng | 6b6471e | 2022-10-10 12:04:30 +0800 | [diff] [blame] | 864 | close(fd); |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 865 | |
| 866 | return g_steal_pointer(&filename); |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 867 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 868 | |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 869 | /* |
| 870 | * Detect host devices. By convention, /dev/cdrom[N] is always |
| 871 | * recognized as a host CDROM. |
| 872 | */ |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 873 | static BlockDriver *find_hdev_driver(const char *filename) |
| 874 | { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 875 | int score_max = 0, score; |
| 876 | BlockDriver *drv = NULL, *d; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 877 | GLOBAL_STATE_CODE(); |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 878 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 879 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 880 | if (d->bdrv_probe_device) { |
| 881 | score = d->bdrv_probe_device(filename); |
| 882 | if (score > score_max) { |
| 883 | score_max = score; |
| 884 | drv = d; |
| 885 | } |
| 886 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 887 | } |
| 888 | |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 889 | return drv; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 890 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 891 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 892 | static BlockDriver *bdrv_do_find_protocol(const char *protocol) |
| 893 | { |
| 894 | BlockDriver *drv1; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 895 | GLOBAL_STATE_CODE(); |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 896 | |
| 897 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 898 | if (drv1->protocol_name && !strcmp(drv1->protocol_name, protocol)) { |
| 899 | return drv1; |
| 900 | } |
| 901 | } |
| 902 | |
| 903 | return NULL; |
| 904 | } |
| 905 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 906 | BlockDriver *bdrv_find_protocol(const char *filename, |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 907 | bool allow_protocol_prefix, |
| 908 | Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 909 | { |
| 910 | BlockDriver *drv1; |
| 911 | char protocol[128]; |
| 912 | int len; |
| 913 | const char *p; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 914 | int i; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 915 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 916 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 917 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
| 918 | |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 919 | /* |
| 920 | * XXX(hch): we really should not let host device detection |
| 921 | * override an explicit protocol specification, but moving this |
| 922 | * later breaks access to device names with colons in them. |
| 923 | * Thanks to the brain-dead persistent naming schemes on udev- |
| 924 | * based Linux systems those actually are quite common. |
| 925 | */ |
| 926 | drv1 = find_hdev_driver(filename); |
| 927 | if (drv1) { |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 928 | return drv1; |
| 929 | } |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 930 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 931 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 932 | return &bdrv_file; |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 933 | } |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 934 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 935 | p = strchr(filename, ':'); |
| 936 | assert(p != NULL); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 937 | len = p - filename; |
| 938 | if (len > sizeof(protocol) - 1) |
| 939 | len = sizeof(protocol) - 1; |
| 940 | memcpy(protocol, filename, len); |
| 941 | protocol[len] = '\0'; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 942 | |
| 943 | drv1 = bdrv_do_find_protocol(protocol); |
| 944 | if (drv1) { |
| 945 | return drv1; |
| 946 | } |
| 947 | |
| 948 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { |
| 949 | if (block_driver_modules[i].protocol_name && |
| 950 | !strcmp(block_driver_modules[i].protocol_name, protocol)) { |
Claudio Fontana | c551fb0 | 2022-09-29 11:30:33 +0200 | [diff] [blame] | 951 | int rv = block_module_load(block_driver_modules[i].library_name, errp); |
| 952 | if (rv > 0) { |
| 953 | drv1 = bdrv_do_find_protocol(protocol); |
| 954 | } else if (rv < 0) { |
| 955 | return NULL; |
| 956 | } |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 957 | break; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 958 | } |
| 959 | } |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 960 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 961 | if (!drv1) { |
| 962 | error_setg(errp, "Unknown protocol '%s'", protocol); |
| 963 | } |
| 964 | return drv1; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 965 | } |
| 966 | |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 967 | /* |
| 968 | * Guess image format by probing its contents. |
| 969 | * This is not a good idea when your image is raw (CVE-2008-2004), but |
| 970 | * we do it anyway for backward compatibility. |
| 971 | * |
| 972 | * @buf contains the image's first @buf_size bytes. |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 973 | * @buf_size is the buffer size in bytes (generally BLOCK_PROBE_BUF_SIZE, |
| 974 | * but can be smaller if the image file is smaller) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 975 | * @filename is its filename. |
| 976 | * |
| 977 | * For all block drivers, call the bdrv_probe() method to get its |
| 978 | * probing score. |
| 979 | * Return the first block driver with the highest probing score. |
| 980 | */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 981 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, |
| 982 | const char *filename) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 983 | { |
| 984 | int score_max = 0, score; |
| 985 | BlockDriver *drv = NULL, *d; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 986 | IO_CODE(); |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 987 | |
| 988 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
| 989 | if (d->bdrv_probe) { |
| 990 | score = d->bdrv_probe(buf, buf_size, filename); |
| 991 | if (score > score_max) { |
| 992 | score_max = score; |
| 993 | drv = d; |
| 994 | } |
| 995 | } |
| 996 | } |
| 997 | |
| 998 | return drv; |
| 999 | } |
| 1000 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1001 | static int find_image_format(BlockBackend *file, const char *filename, |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1002 | BlockDriver **pdrv, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1003 | { |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 1004 | BlockDriver *drv; |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 1005 | uint8_t buf[BLOCK_PROBE_BUF_SIZE]; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1006 | int ret = 0; |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 1007 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1008 | GLOBAL_STATE_CODE(); |
| 1009 | |
Kevin Wolf | 08a0055 | 2010-06-01 18:37:31 +0200 | [diff] [blame] | 1010 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1011 | 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] | 1012 | *pdrv = &bdrv_raw; |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1013 | return ret; |
Nicholas A. Bellinger | 1a39685 | 2010-05-27 08:56:28 -0700 | [diff] [blame] | 1014 | } |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 1015 | |
Alberto Faria | a9262f5 | 2022-07-05 17:15:11 +0100 | [diff] [blame] | 1016 | ret = blk_pread(file, 0, sizeof(buf), buf, 0); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 1017 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1018 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
| 1019 | "format"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1020 | *pdrv = NULL; |
| 1021 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 1022 | } |
| 1023 | |
Alberto Faria | bf5b16f | 2022-07-05 17:15:09 +0100 | [diff] [blame] | 1024 | drv = bdrv_probe_all(buf, sizeof(buf), filename); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1025 | if (!drv) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1026 | error_setg(errp, "Could not determine image format: No compatible " |
| 1027 | "driver found"); |
Alberto Faria | bf5b16f | 2022-07-05 17:15:09 +0100 | [diff] [blame] | 1028 | *pdrv = NULL; |
| 1029 | return -ENOENT; |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1030 | } |
Alberto Faria | bf5b16f | 2022-07-05 17:15:09 +0100 | [diff] [blame] | 1031 | |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 1032 | *pdrv = drv; |
Alberto Faria | bf5b16f | 2022-07-05 17:15:09 +0100 | [diff] [blame] | 1033 | return 0; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1034 | } |
| 1035 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1036 | /** |
| 1037 | * Set the current 'total_sectors' value |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 1038 | * Return 0 on success, -errno on error. |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1039 | */ |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 1040 | int coroutine_fn bdrv_co_refresh_total_sectors(BlockDriverState *bs, |
| 1041 | int64_t hint) |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1042 | { |
| 1043 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 1044 | IO_CODE(); |
Kevin Wolf | 8ab8140 | 2023-02-03 16:22:02 +0100 | [diff] [blame] | 1045 | assert_bdrv_graph_readable(); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1046 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 1047 | if (!drv) { |
| 1048 | return -ENOMEDIUM; |
| 1049 | } |
| 1050 | |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 1051 | /* Do not attempt drv->bdrv_co_getlength() on scsi-generic devices */ |
Dimitris Aragiorgis | b192af8 | 2015-06-23 13:44:56 +0300 | [diff] [blame] | 1052 | if (bdrv_is_sg(bs)) |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 1053 | return 0; |
| 1054 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1055 | /* query actual device if possible, otherwise just trust the hint */ |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 1056 | if (drv->bdrv_co_getlength) { |
| 1057 | int64_t length = drv->bdrv_co_getlength(bs); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1058 | if (length < 0) { |
| 1059 | return length; |
| 1060 | } |
Fam Zheng | 7e38200 | 2013-11-06 19:48:06 +0800 | [diff] [blame] | 1061 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1062 | } |
| 1063 | |
| 1064 | bs->total_sectors = hint; |
Vladimir Sementsov-Ogievskiy | 8b11700 | 2020-12-04 01:27:13 +0300 | [diff] [blame] | 1065 | |
| 1066 | if (bs->total_sectors * BDRV_SECTOR_SIZE > BDRV_MAX_LENGTH) { |
| 1067 | return -EFBIG; |
| 1068 | } |
| 1069 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1070 | return 0; |
| 1071 | } |
| 1072 | |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1073 | /** |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 1074 | * Combines a QDict of new block driver @options with any missing options taken |
| 1075 | * from @old_options, so that leaving out an option defaults to its old value. |
| 1076 | */ |
| 1077 | static void bdrv_join_options(BlockDriverState *bs, QDict *options, |
| 1078 | QDict *old_options) |
| 1079 | { |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 1080 | GLOBAL_STATE_CODE(); |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 1081 | if (bs->drv && bs->drv->bdrv_join_options) { |
| 1082 | bs->drv->bdrv_join_options(options, old_options); |
| 1083 | } else { |
| 1084 | qdict_join(options, old_options, false); |
| 1085 | } |
| 1086 | } |
| 1087 | |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 1088 | static BlockdevDetectZeroesOptions bdrv_parse_detect_zeroes(QemuOpts *opts, |
| 1089 | int open_flags, |
| 1090 | Error **errp) |
| 1091 | { |
| 1092 | Error *local_err = NULL; |
| 1093 | char *value = qemu_opt_get_del(opts, "detect-zeroes"); |
| 1094 | BlockdevDetectZeroesOptions detect_zeroes = |
| 1095 | qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, value, |
| 1096 | BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, &local_err); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1097 | GLOBAL_STATE_CODE(); |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 1098 | g_free(value); |
| 1099 | if (local_err) { |
| 1100 | error_propagate(errp, local_err); |
| 1101 | return detect_zeroes; |
| 1102 | } |
| 1103 | |
| 1104 | if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && |
| 1105 | !(open_flags & BDRV_O_UNMAP)) |
| 1106 | { |
| 1107 | error_setg(errp, "setting detect-zeroes to unmap is not allowed " |
| 1108 | "without setting discard operation to unmap"); |
| 1109 | } |
| 1110 | |
| 1111 | return detect_zeroes; |
| 1112 | } |
| 1113 | |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 1114 | /** |
Aarushi Mehta | f80f267 | 2020-01-20 14:18:50 +0000 | [diff] [blame] | 1115 | * Set open flags for aio engine |
| 1116 | * |
| 1117 | * Return 0 on success, -1 if the engine specified is invalid |
| 1118 | */ |
| 1119 | int bdrv_parse_aio(const char *mode, int *flags) |
| 1120 | { |
| 1121 | if (!strcmp(mode, "threads")) { |
| 1122 | /* do nothing, default */ |
| 1123 | } else if (!strcmp(mode, "native")) { |
| 1124 | *flags |= BDRV_O_NATIVE_AIO; |
| 1125 | #ifdef CONFIG_LINUX_IO_URING |
| 1126 | } else if (!strcmp(mode, "io_uring")) { |
| 1127 | *flags |= BDRV_O_IO_URING; |
| 1128 | #endif |
| 1129 | } else { |
| 1130 | return -1; |
| 1131 | } |
| 1132 | |
| 1133 | return 0; |
| 1134 | } |
| 1135 | |
| 1136 | /** |
Paolo Bonzini | 9e8f183 | 2013-02-08 14:06:11 +0100 | [diff] [blame] | 1137 | * Set open flags for a given discard mode |
| 1138 | * |
| 1139 | * Return 0 on success, -1 if the discard mode was invalid. |
| 1140 | */ |
| 1141 | int bdrv_parse_discard_flags(const char *mode, int *flags) |
| 1142 | { |
| 1143 | *flags &= ~BDRV_O_UNMAP; |
| 1144 | |
| 1145 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { |
| 1146 | /* do nothing */ |
| 1147 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { |
| 1148 | *flags |= BDRV_O_UNMAP; |
| 1149 | } else { |
| 1150 | return -1; |
| 1151 | } |
| 1152 | |
| 1153 | return 0; |
| 1154 | } |
| 1155 | |
| 1156 | /** |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1157 | * Set open flags for a given cache mode |
| 1158 | * |
| 1159 | * Return 0 on success, -1 if the cache mode was invalid. |
| 1160 | */ |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1161 | int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough) |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1162 | { |
| 1163 | *flags &= ~BDRV_O_CACHE_MASK; |
| 1164 | |
| 1165 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1166 | *writethrough = false; |
| 1167 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 1168 | } else if (!strcmp(mode, "directsync")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1169 | *writethrough = true; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 1170 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1171 | } else if (!strcmp(mode, "writeback")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1172 | *writethrough = false; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1173 | } else if (!strcmp(mode, "unsafe")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1174 | *writethrough = false; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1175 | *flags |= BDRV_O_NO_FLUSH; |
| 1176 | } else if (!strcmp(mode, "writethrough")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 1177 | *writethrough = true; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 1178 | } else { |
| 1179 | return -1; |
| 1180 | } |
| 1181 | |
| 1182 | return 0; |
| 1183 | } |
| 1184 | |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 1185 | static char *bdrv_child_get_parent_desc(BdrvChild *c) |
| 1186 | { |
| 1187 | BlockDriverState *parent = c->opaque; |
Vladimir Sementsov-Ogievskiy | 2c0a3ac | 2021-06-01 10:52:15 +0300 | [diff] [blame] | 1188 | return g_strdup_printf("node '%s'", bdrv_get_node_name(parent)); |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 1189 | } |
| 1190 | |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1191 | static void bdrv_child_cb_drained_begin(BdrvChild *child) |
| 1192 | { |
| 1193 | BlockDriverState *bs = child->opaque; |
Kevin Wolf | a82a3bd | 2022-11-18 18:41:07 +0100 | [diff] [blame] | 1194 | bdrv_do_drained_begin_quiesce(bs, NULL); |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1195 | } |
| 1196 | |
Kevin Wolf | 89bd030 | 2018-03-22 14:11:20 +0100 | [diff] [blame] | 1197 | static bool bdrv_child_cb_drained_poll(BdrvChild *child) |
| 1198 | { |
| 1199 | BlockDriverState *bs = child->opaque; |
Kevin Wolf | 299403a | 2022-11-18 18:41:05 +0100 | [diff] [blame] | 1200 | return bdrv_drain_poll(bs, NULL, false); |
Kevin Wolf | 89bd030 | 2018-03-22 14:11:20 +0100 | [diff] [blame] | 1201 | } |
| 1202 | |
Kevin Wolf | 2f65df6 | 2022-11-18 18:40:59 +0100 | [diff] [blame] | 1203 | static void bdrv_child_cb_drained_end(BdrvChild *child) |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1204 | { |
| 1205 | BlockDriverState *bs = child->opaque; |
Kevin Wolf | 2f65df6 | 2022-11-18 18:40:59 +0100 | [diff] [blame] | 1206 | bdrv_drained_end(bs); |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1207 | } |
| 1208 | |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 1209 | static int bdrv_child_cb_inactivate(BdrvChild *child) |
| 1210 | { |
| 1211 | BlockDriverState *bs = child->opaque; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1212 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 1213 | assert(bs->open_flags & BDRV_O_INACTIVE); |
| 1214 | return 0; |
| 1215 | } |
| 1216 | |
Emanuele Giuseppe Esposito | 27633e7 | 2022-10-25 04:49:47 -0400 | [diff] [blame] | 1217 | static bool bdrv_child_cb_change_aio_ctx(BdrvChild *child, AioContext *ctx, |
| 1218 | GHashTable *visited, Transaction *tran, |
| 1219 | Error **errp) |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 1220 | { |
| 1221 | BlockDriverState *bs = child->opaque; |
Emanuele Giuseppe Esposito | 27633e7 | 2022-10-25 04:49:47 -0400 | [diff] [blame] | 1222 | return bdrv_change_aio_context(bs, ctx, visited, tran, errp); |
Kevin Wolf | 53a7d04 | 2019-05-06 19:17:59 +0200 | [diff] [blame] | 1223 | } |
| 1224 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 1225 | /* |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 1226 | * Returns the options and flags that a temporary snapshot should get, based on |
| 1227 | * the originally requested flags (the originally requested image will have |
| 1228 | * flags like a backing file) |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1229 | */ |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 1230 | static void bdrv_temp_snapshot_options(int *child_flags, QDict *child_options, |
| 1231 | int parent_flags, QDict *parent_options) |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1232 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1233 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 1234 | *child_flags = (parent_flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; |
| 1235 | |
| 1236 | /* For temporary files, unconditional cache=unsafe is fine */ |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 1237 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_DIRECT, "off"); |
| 1238 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on"); |
Kevin Wolf | 4186904 | 2016-06-16 12:59:30 +0200 | [diff] [blame] | 1239 | |
Kevin Wolf | 3f48686 | 2019-04-04 17:04:43 +0200 | [diff] [blame] | 1240 | /* Copy the read-only and discard options from the parent */ |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1241 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); |
Kevin Wolf | 3f48686 | 2019-04-04 17:04:43 +0200 | [diff] [blame] | 1242 | qdict_copy_default(child_options, parent_options, BDRV_OPT_DISCARD); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1243 | |
Kevin Wolf | 4186904 | 2016-06-16 12:59:30 +0200 | [diff] [blame] | 1244 | /* aio=native doesn't work for cache.direct=off, so disable it for the |
| 1245 | * temporary snapshot */ |
| 1246 | *child_flags &= ~BDRV_O_NATIVE_AIO; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1247 | } |
| 1248 | |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1249 | static void bdrv_backing_attach(BdrvChild *c) |
| 1250 | { |
| 1251 | BlockDriverState *parent = c->opaque; |
| 1252 | BlockDriverState *backing_hd = c->bs; |
| 1253 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1254 | GLOBAL_STATE_CODE(); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1255 | assert(!parent->backing_blocker); |
| 1256 | error_setg(&parent->backing_blocker, |
| 1257 | "node is used as backing hd of '%s'", |
| 1258 | bdrv_get_device_or_node_name(parent)); |
| 1259 | |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 1260 | bdrv_refresh_filename(backing_hd); |
| 1261 | |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1262 | parent->open_flags &= ~BDRV_O_NO_BACKING; |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1263 | |
| 1264 | bdrv_op_block_all(backing_hd, parent->backing_blocker); |
| 1265 | /* Otherwise we won't be able to commit or stream */ |
| 1266 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, |
| 1267 | parent->backing_blocker); |
| 1268 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_STREAM, |
| 1269 | parent->backing_blocker); |
| 1270 | /* |
| 1271 | * We do backup in 3 ways: |
| 1272 | * 1. drive backup |
| 1273 | * The target bs is new opened, and the source is top BDS |
| 1274 | * 2. blockdev backup |
| 1275 | * Both the source and the target are top BDSes. |
| 1276 | * 3. internal backup(used for block replication) |
| 1277 | * Both the source and the target are backing file |
| 1278 | * |
| 1279 | * In case 1 and 2, neither the source nor the target is the backing file. |
| 1280 | * In case 3, we will block the top BDS, so there is only one block job |
| 1281 | * for the top BDS and its backing chain. |
| 1282 | */ |
| 1283 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_SOURCE, |
| 1284 | parent->backing_blocker); |
| 1285 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_TARGET, |
| 1286 | parent->backing_blocker); |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1287 | } |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 1288 | |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1289 | static void bdrv_backing_detach(BdrvChild *c) |
| 1290 | { |
| 1291 | BlockDriverState *parent = c->opaque; |
| 1292 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1293 | GLOBAL_STATE_CODE(); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1294 | assert(parent->backing_blocker); |
| 1295 | bdrv_op_unblock_all(c->bs, parent->backing_blocker); |
| 1296 | error_free(parent->backing_blocker); |
| 1297 | parent->backing_blocker = NULL; |
Max Reitz | 48e0828 | 2020-05-13 13:05:23 +0200 | [diff] [blame] | 1298 | } |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 1299 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1300 | static int bdrv_backing_update_filename(BdrvChild *c, BlockDriverState *base, |
| 1301 | const char *filename, Error **errp) |
| 1302 | { |
| 1303 | BlockDriverState *parent = c->opaque; |
Alberto Garcia | e94d3db | 2018-11-12 16:00:34 +0200 | [diff] [blame] | 1304 | bool read_only = bdrv_is_read_only(parent); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1305 | int ret; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1306 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1307 | |
Alberto Garcia | e94d3db | 2018-11-12 16:00:34 +0200 | [diff] [blame] | 1308 | if (read_only) { |
| 1309 | ret = bdrv_reopen_set_read_only(parent, false, errp); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 1310 | if (ret < 0) { |
| 1311 | return ret; |
| 1312 | } |
| 1313 | } |
| 1314 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1315 | ret = bdrv_change_backing_file(parent, filename, |
Eric Blake | e54ee1b | 2020-07-06 15:39:53 -0500 | [diff] [blame] | 1316 | base->drv ? base->drv->format_name : "", |
| 1317 | false); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1318 | if (ret < 0) { |
Kevin Wolf | 6473069 | 2017-11-06 17:52:58 +0100 | [diff] [blame] | 1319 | error_setg_errno(errp, -ret, "Could not update backing file link"); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1320 | } |
| 1321 | |
Alberto Garcia | e94d3db | 2018-11-12 16:00:34 +0200 | [diff] [blame] | 1322 | if (read_only) { |
| 1323 | bdrv_reopen_set_read_only(parent, true, NULL); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 1324 | } |
| 1325 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1326 | return ret; |
| 1327 | } |
| 1328 | |
Max Reitz | fae8bd3 | 2020-05-13 13:05:20 +0200 | [diff] [blame] | 1329 | /* |
| 1330 | * Returns the options and flags that a generic child of a BDS should |
| 1331 | * get, based on the given options and flags for the parent BDS. |
| 1332 | */ |
Max Reitz | 00ff7ff | 2020-05-13 13:05:21 +0200 | [diff] [blame] | 1333 | static void bdrv_inherited_options(BdrvChildRole role, bool parent_is_format, |
| 1334 | int *child_flags, QDict *child_options, |
| 1335 | int parent_flags, QDict *parent_options) |
Max Reitz | fae8bd3 | 2020-05-13 13:05:20 +0200 | [diff] [blame] | 1336 | { |
| 1337 | int flags = parent_flags; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1338 | GLOBAL_STATE_CODE(); |
Max Reitz | fae8bd3 | 2020-05-13 13:05:20 +0200 | [diff] [blame] | 1339 | |
| 1340 | /* |
| 1341 | * First, decide whether to set, clear, or leave BDRV_O_PROTOCOL. |
| 1342 | * Generally, the question to answer is: Should this child be |
| 1343 | * format-probed by default? |
| 1344 | */ |
| 1345 | |
| 1346 | /* |
| 1347 | * Pure and non-filtered data children of non-format nodes should |
| 1348 | * be probed by default (even when the node itself has BDRV_O_PROTOCOL |
| 1349 | * set). This only affects a very limited set of drivers (namely |
| 1350 | * quorum and blkverify when this comment was written). |
| 1351 | * Force-clear BDRV_O_PROTOCOL then. |
| 1352 | */ |
| 1353 | if (!parent_is_format && |
| 1354 | (role & BDRV_CHILD_DATA) && |
| 1355 | !(role & (BDRV_CHILD_METADATA | BDRV_CHILD_FILTERED))) |
| 1356 | { |
| 1357 | flags &= ~BDRV_O_PROTOCOL; |
| 1358 | } |
| 1359 | |
| 1360 | /* |
| 1361 | * All children of format nodes (except for COW children) and all |
| 1362 | * metadata children in general should never be format-probed. |
| 1363 | * Force-set BDRV_O_PROTOCOL then. |
| 1364 | */ |
| 1365 | if ((parent_is_format && !(role & BDRV_CHILD_COW)) || |
| 1366 | (role & BDRV_CHILD_METADATA)) |
| 1367 | { |
| 1368 | flags |= BDRV_O_PROTOCOL; |
| 1369 | } |
| 1370 | |
| 1371 | /* |
| 1372 | * If the cache mode isn't explicitly set, inherit direct and no-flush from |
| 1373 | * the parent. |
| 1374 | */ |
| 1375 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); |
| 1376 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); |
| 1377 | qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE); |
| 1378 | |
| 1379 | if (role & BDRV_CHILD_COW) { |
| 1380 | /* backing files are opened read-only by default */ |
| 1381 | qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "on"); |
| 1382 | qdict_set_default_str(child_options, BDRV_OPT_AUTO_READ_ONLY, "off"); |
| 1383 | } else { |
| 1384 | /* Inherit the read-only option from the parent if it's not set */ |
| 1385 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); |
| 1386 | qdict_copy_default(child_options, parent_options, |
| 1387 | BDRV_OPT_AUTO_READ_ONLY); |
| 1388 | } |
| 1389 | |
| 1390 | /* |
| 1391 | * bdrv_co_pdiscard() respects unmap policy for the parent, so we |
| 1392 | * can default to enable it on lower layers regardless of the |
| 1393 | * parent option. |
| 1394 | */ |
| 1395 | qdict_set_default_str(child_options, BDRV_OPT_DISCARD, "unmap"); |
| 1396 | |
| 1397 | /* Clear flags that only apply to the top layer */ |
| 1398 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); |
| 1399 | |
| 1400 | if (role & BDRV_CHILD_METADATA) { |
| 1401 | flags &= ~BDRV_O_NO_IO; |
| 1402 | } |
| 1403 | if (role & BDRV_CHILD_COW) { |
| 1404 | flags &= ~BDRV_O_TEMPORARY; |
| 1405 | } |
| 1406 | |
| 1407 | *child_flags = flags; |
| 1408 | } |
| 1409 | |
Kevin Wolf | 303de47 | 2022-12-07 14:18:35 +0100 | [diff] [blame] | 1410 | static void GRAPH_WRLOCK bdrv_child_cb_attach(BdrvChild *child) |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1411 | { |
| 1412 | BlockDriverState *bs = child->opaque; |
| 1413 | |
Emanuele Giuseppe Esposito | 3f35f82 | 2022-12-07 14:18:33 +0100 | [diff] [blame] | 1414 | assert_bdrv_graph_writable(); |
Hanna Reitz | a225369 | 2021-11-15 15:53:58 +0100 | [diff] [blame] | 1415 | QLIST_INSERT_HEAD(&bs->children, child, next); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1416 | if (bs->drv->is_filter || (child->role & BDRV_CHILD_FILTERED)) { |
| 1417 | /* |
| 1418 | * Here we handle filters and block/raw-format.c when it behave like |
| 1419 | * filter. They generally have a single PRIMARY child, which is also the |
| 1420 | * FILTERED child, and that they may have multiple more children, which |
| 1421 | * are neither PRIMARY nor FILTERED. And never we have a COW child here. |
| 1422 | * So bs->file will be the PRIMARY child, unless the PRIMARY child goes |
| 1423 | * into bs->backing on exceptional cases; and bs->backing will be |
| 1424 | * nothing else. |
| 1425 | */ |
| 1426 | assert(!(child->role & BDRV_CHILD_COW)); |
| 1427 | if (child->role & BDRV_CHILD_PRIMARY) { |
| 1428 | assert(child->role & BDRV_CHILD_FILTERED); |
| 1429 | assert(!bs->backing); |
| 1430 | assert(!bs->file); |
Hanna Reitz | a225369 | 2021-11-15 15:53:58 +0100 | [diff] [blame] | 1431 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1432 | if (bs->drv->filtered_child_is_backing) { |
| 1433 | bs->backing = child; |
| 1434 | } else { |
| 1435 | bs->file = child; |
| 1436 | } |
| 1437 | } else { |
| 1438 | assert(!(child->role & BDRV_CHILD_FILTERED)); |
| 1439 | } |
| 1440 | } else if (child->role & BDRV_CHILD_COW) { |
| 1441 | assert(bs->drv->supports_backing); |
| 1442 | assert(!(child->role & BDRV_CHILD_PRIMARY)); |
| 1443 | assert(!bs->backing); |
| 1444 | bs->backing = child; |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1445 | bdrv_backing_attach(child); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1446 | } else if (child->role & BDRV_CHILD_PRIMARY) { |
| 1447 | assert(!bs->file); |
| 1448 | bs->file = child; |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1449 | } |
Max Reitz | ca2f123 | 2020-05-13 13:05:22 +0200 | [diff] [blame] | 1450 | } |
| 1451 | |
Kevin Wolf | 303de47 | 2022-12-07 14:18:35 +0100 | [diff] [blame] | 1452 | static void GRAPH_WRLOCK bdrv_child_cb_detach(BdrvChild *child) |
Max Reitz | 48e0828 | 2020-05-13 13:05:23 +0200 | [diff] [blame] | 1453 | { |
| 1454 | BlockDriverState *bs = child->opaque; |
| 1455 | |
| 1456 | if (child->role & BDRV_CHILD_COW) { |
| 1457 | bdrv_backing_detach(child); |
| 1458 | } |
| 1459 | |
Emanuele Giuseppe Esposito | 3f35f82 | 2022-12-07 14:18:33 +0100 | [diff] [blame] | 1460 | assert_bdrv_graph_writable(); |
Hanna Reitz | a225369 | 2021-11-15 15:53:58 +0100 | [diff] [blame] | 1461 | QLIST_REMOVE(child, next); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1462 | if (child == bs->backing) { |
| 1463 | assert(child != bs->file); |
| 1464 | bs->backing = NULL; |
| 1465 | } else if (child == bs->file) { |
| 1466 | bs->file = NULL; |
| 1467 | } |
Max Reitz | 48e0828 | 2020-05-13 13:05:23 +0200 | [diff] [blame] | 1468 | } |
| 1469 | |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1470 | static int bdrv_child_cb_update_filename(BdrvChild *c, BlockDriverState *base, |
| 1471 | const char *filename, Error **errp) |
| 1472 | { |
| 1473 | if (c->role & BDRV_CHILD_COW) { |
| 1474 | return bdrv_backing_update_filename(c, base, filename, errp); |
| 1475 | } |
| 1476 | return 0; |
| 1477 | } |
| 1478 | |
Vladimir Sementsov-Ogievskiy | fb62b58 | 2021-05-24 13:12:56 +0300 | [diff] [blame] | 1479 | AioContext *child_of_bds_get_parent_aio_context(BdrvChild *c) |
Vladimir Sementsov-Ogievskiy | 3ca1f32 | 2021-04-28 18:17:33 +0300 | [diff] [blame] | 1480 | { |
| 1481 | BlockDriverState *bs = c->opaque; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 1482 | IO_CODE(); |
Vladimir Sementsov-Ogievskiy | 3ca1f32 | 2021-04-28 18:17:33 +0300 | [diff] [blame] | 1483 | |
| 1484 | return bdrv_get_aio_context(bs); |
| 1485 | } |
| 1486 | |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1487 | const BdrvChildClass child_of_bds = { |
| 1488 | .parent_is_bds = true, |
| 1489 | .get_parent_desc = bdrv_child_get_parent_desc, |
| 1490 | .inherit_options = bdrv_inherited_options, |
| 1491 | .drained_begin = bdrv_child_cb_drained_begin, |
| 1492 | .drained_poll = bdrv_child_cb_drained_poll, |
| 1493 | .drained_end = bdrv_child_cb_drained_end, |
| 1494 | .attach = bdrv_child_cb_attach, |
| 1495 | .detach = bdrv_child_cb_detach, |
| 1496 | .inactivate = bdrv_child_cb_inactivate, |
Emanuele Giuseppe Esposito | 27633e7 | 2022-10-25 04:49:47 -0400 | [diff] [blame] | 1497 | .change_aio_ctx = bdrv_child_cb_change_aio_ctx, |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1498 | .update_filename = bdrv_child_cb_update_filename, |
Vladimir Sementsov-Ogievskiy | fb62b58 | 2021-05-24 13:12:56 +0300 | [diff] [blame] | 1499 | .get_parent_aio_context = child_of_bds_get_parent_aio_context, |
Max Reitz | 4348355 | 2020-05-13 13:05:24 +0200 | [diff] [blame] | 1500 | }; |
| 1501 | |
Vladimir Sementsov-Ogievskiy | 3ca1f32 | 2021-04-28 18:17:33 +0300 | [diff] [blame] | 1502 | AioContext *bdrv_child_get_parent_aio_context(BdrvChild *c) |
| 1503 | { |
Hanna Reitz | d5f8d79 | 2022-11-07 16:13:19 +0100 | [diff] [blame] | 1504 | IO_CODE(); |
Vladimir Sementsov-Ogievskiy | 3ca1f32 | 2021-04-28 18:17:33 +0300 | [diff] [blame] | 1505 | return c->klass->get_parent_aio_context(c); |
| 1506 | } |
| 1507 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1508 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
| 1509 | { |
Kevin Wolf | 61de4c6 | 2016-03-18 17:46:45 +0100 | [diff] [blame] | 1510 | int open_flags = flags; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1511 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1512 | |
| 1513 | /* |
| 1514 | * Clear flags that are internal to the block layer before opening the |
| 1515 | * image. |
| 1516 | */ |
Kevin Wolf | 20cca27 | 2014-06-04 14:33:27 +0200 | [diff] [blame] | 1517 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1518 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1519 | return open_flags; |
| 1520 | } |
| 1521 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1522 | static void update_flags_from_options(int *flags, QemuOpts *opts) |
| 1523 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1524 | GLOBAL_STATE_CODE(); |
| 1525 | |
Alberto Garcia | 2a3d433 | 2018-11-12 16:00:48 +0200 | [diff] [blame] | 1526 | *flags &= ~(BDRV_O_CACHE_MASK | BDRV_O_RDWR | BDRV_O_AUTO_RDONLY); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1527 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 1528 | 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] | 1529 | *flags |= BDRV_O_NO_FLUSH; |
| 1530 | } |
| 1531 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 1532 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_CACHE_DIRECT, false)) { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1533 | *flags |= BDRV_O_NOCACHE; |
| 1534 | } |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1535 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 1536 | if (!qemu_opt_get_bool_del(opts, BDRV_OPT_READ_ONLY, false)) { |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1537 | *flags |= BDRV_O_RDWR; |
| 1538 | } |
| 1539 | |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1540 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_AUTO_READ_ONLY, false)) { |
| 1541 | *flags |= BDRV_O_AUTO_RDONLY; |
| 1542 | } |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1543 | } |
| 1544 | |
| 1545 | static void update_options_from_flags(QDict *options, int flags) |
| 1546 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1547 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1548 | if (!qdict_haskey(options, BDRV_OPT_CACHE_DIRECT)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1549 | qdict_put_bool(options, BDRV_OPT_CACHE_DIRECT, flags & BDRV_O_NOCACHE); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1550 | } |
| 1551 | if (!qdict_haskey(options, BDRV_OPT_CACHE_NO_FLUSH)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1552 | qdict_put_bool(options, BDRV_OPT_CACHE_NO_FLUSH, |
| 1553 | flags & BDRV_O_NO_FLUSH); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1554 | } |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1555 | if (!qdict_haskey(options, BDRV_OPT_READ_ONLY)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1556 | qdict_put_bool(options, BDRV_OPT_READ_ONLY, !(flags & BDRV_O_RDWR)); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1557 | } |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1558 | if (!qdict_haskey(options, BDRV_OPT_AUTO_READ_ONLY)) { |
| 1559 | qdict_put_bool(options, BDRV_OPT_AUTO_READ_ONLY, |
| 1560 | flags & BDRV_O_AUTO_RDONLY); |
| 1561 | } |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1562 | } |
| 1563 | |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 1564 | static void bdrv_assign_node_name(BlockDriverState *bs, |
| 1565 | const char *node_name, |
| 1566 | Error **errp) |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1567 | { |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1568 | char *gen_node_name = NULL; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1569 | GLOBAL_STATE_CODE(); |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1570 | |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1571 | if (!node_name) { |
| 1572 | node_name = gen_node_name = id_generate(ID_BLOCK); |
| 1573 | } else if (!id_wellformed(node_name)) { |
| 1574 | /* |
| 1575 | * Check for empty string or invalid characters, but not if it is |
| 1576 | * generated (generated names use characters not available to the user) |
| 1577 | */ |
Connor Kuehl | 785ec4b | 2021-03-05 09:19:28 -0600 | [diff] [blame] | 1578 | error_setg(errp, "Invalid node-name: '%s'", node_name); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 1579 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1580 | } |
| 1581 | |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1582 | /* takes care of avoiding namespaces collisions */ |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 1583 | if (blk_by_name(node_name)) { |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1584 | error_setg(errp, "node-name=%s is conflicting with a device id", |
| 1585 | node_name); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1586 | goto out; |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1587 | } |
| 1588 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1589 | /* takes care of avoiding duplicates node names */ |
| 1590 | if (bdrv_find_node(node_name)) { |
Connor Kuehl | 785ec4b | 2021-03-05 09:19:28 -0600 | [diff] [blame] | 1591 | error_setg(errp, "Duplicate nodes with node-name='%s'", node_name); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1592 | goto out; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1593 | } |
| 1594 | |
Kevin Wolf | 824808d | 2018-07-04 13:28:29 +0200 | [diff] [blame] | 1595 | /* Make sure that the node name isn't truncated */ |
| 1596 | if (strlen(node_name) >= sizeof(bs->node_name)) { |
| 1597 | error_setg(errp, "Node name too long"); |
| 1598 | goto out; |
| 1599 | } |
| 1600 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1601 | /* copy node name into the bs and insert it into the graph list */ |
| 1602 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); |
| 1603 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1604 | out: |
| 1605 | g_free(gen_node_name); |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1606 | } |
| 1607 | |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 1608 | /* |
| 1609 | * The caller must always hold @bs AioContext lock, because this function calls |
| 1610 | * bdrv_refresh_total_sectors() which polls when called from non-coroutine |
| 1611 | * context. |
| 1612 | */ |
Kevin Wolf | 1a30b0f | 2023-05-04 13:57:38 +0200 | [diff] [blame] | 1613 | static int no_coroutine_fn GRAPH_UNLOCKED |
| 1614 | bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, const char *node_name, |
| 1615 | QDict *options, int open_flags, Error **errp) |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1616 | { |
Kevin Wolf | 8dc8a60 | 2023-05-25 14:47:10 +0200 | [diff] [blame] | 1617 | AioContext *ctx; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1618 | Error *local_err = NULL; |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 1619 | int i, ret; |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 1620 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1621 | |
| 1622 | bdrv_assign_node_name(bs, node_name, &local_err); |
| 1623 | if (local_err) { |
| 1624 | error_propagate(errp, local_err); |
| 1625 | return -EINVAL; |
| 1626 | } |
| 1627 | |
| 1628 | bs->drv = drv; |
| 1629 | bs->opaque = g_malloc0(drv->instance_size); |
| 1630 | |
| 1631 | if (drv->bdrv_file_open) { |
| 1632 | assert(!drv->bdrv_needs_filename || bs->filename[0]); |
| 1633 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1634 | } else if (drv->bdrv_open) { |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1635 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1636 | } else { |
| 1637 | ret = 0; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1638 | } |
| 1639 | |
| 1640 | if (ret < 0) { |
| 1641 | if (local_err) { |
| 1642 | error_propagate(errp, local_err); |
| 1643 | } else if (bs->filename[0]) { |
| 1644 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); |
| 1645 | } else { |
| 1646 | error_setg_errno(errp, -ret, "Could not open image"); |
| 1647 | } |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1648 | goto open_failed; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1649 | } |
| 1650 | |
Stefan Hajnoczi | e8b6535 | 2022-10-13 14:59:01 -0400 | [diff] [blame] | 1651 | assert(!(bs->supported_read_flags & ~BDRV_REQ_MASK)); |
| 1652 | assert(!(bs->supported_write_flags & ~BDRV_REQ_MASK)); |
| 1653 | |
| 1654 | /* |
| 1655 | * Always allow the BDRV_REQ_REGISTERED_BUF optimization hint. This saves |
| 1656 | * drivers that pass read/write requests through to a child the trouble of |
| 1657 | * declaring support explicitly. |
| 1658 | * |
| 1659 | * Drivers must not propagate this flag accidentally when they initiate I/O |
| 1660 | * to a bounce buffer. That case should be rare though. |
| 1661 | */ |
| 1662 | bs->supported_read_flags |= BDRV_REQ_REGISTERED_BUF; |
| 1663 | bs->supported_write_flags |= BDRV_REQ_REGISTERED_BUF; |
| 1664 | |
Kevin Wolf | 8dc8a60 | 2023-05-25 14:47:10 +0200 | [diff] [blame] | 1665 | /* Get the context after .bdrv_open, it can change the context */ |
| 1666 | ctx = bdrv_get_aio_context(bs); |
| 1667 | aio_context_acquire(ctx); |
| 1668 | |
Emanuele Giuseppe Esposito | c057960 | 2023-01-13 21:42:03 +0100 | [diff] [blame] | 1669 | ret = bdrv_refresh_total_sectors(bs, bs->total_sectors); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1670 | if (ret < 0) { |
| 1671 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
Kevin Wolf | 8dc8a60 | 2023-05-25 14:47:10 +0200 | [diff] [blame] | 1672 | aio_context_release(ctx); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1673 | return ret; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1674 | } |
| 1675 | |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 1676 | bdrv_graph_rdlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 1e4c797 | 2021-04-28 18:17:55 +0300 | [diff] [blame] | 1677 | bdrv_refresh_limits(bs, NULL, &local_err); |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 1678 | bdrv_graph_rdunlock_main_loop(); |
Kevin Wolf | 8dc8a60 | 2023-05-25 14:47:10 +0200 | [diff] [blame] | 1679 | aio_context_release(ctx); |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 1680 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1681 | if (local_err) { |
| 1682 | error_propagate(errp, local_err); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1683 | return -EINVAL; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1684 | } |
| 1685 | |
| 1686 | assert(bdrv_opt_mem_align(bs) != 0); |
| 1687 | assert(bdrv_min_mem_align(bs) != 0); |
| 1688 | assert(is_power_of_2(bs->bl.request_alignment)); |
| 1689 | |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 1690 | for (i = 0; i < bs->quiesce_counter; i++) { |
Kevin Wolf | 5e8ac21 | 2022-11-18 18:40:58 +0100 | [diff] [blame] | 1691 | if (drv->bdrv_drain_begin) { |
| 1692 | drv->bdrv_drain_begin(bs); |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 1693 | } |
| 1694 | } |
| 1695 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1696 | return 0; |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1697 | open_failed: |
| 1698 | bs->drv = NULL; |
| 1699 | if (bs->file != NULL) { |
| 1700 | bdrv_unref_child(bs, bs->file); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 1701 | assert(!bs->file); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1702 | } |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1703 | g_free(bs->opaque); |
| 1704 | bs->opaque = NULL; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1705 | return ret; |
| 1706 | } |
| 1707 | |
Vladimir Sementsov-Ogievskiy | 621d173 | 2021-09-20 14:55:34 +0300 | [diff] [blame] | 1708 | /* |
| 1709 | * Create and open a block node. |
| 1710 | * |
| 1711 | * @options is a QDict of options to pass to the block drivers, or NULL for an |
| 1712 | * empty set of options. The reference to the QDict belongs to the block layer |
| 1713 | * after the call (even on failure), so if the caller intends to reuse the |
| 1714 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. |
| 1715 | */ |
| 1716 | BlockDriverState *bdrv_new_open_driver_opts(BlockDriver *drv, |
| 1717 | const char *node_name, |
| 1718 | QDict *options, int flags, |
| 1719 | Error **errp) |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1720 | { |
| 1721 | BlockDriverState *bs; |
| 1722 | int ret; |
| 1723 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 1724 | GLOBAL_STATE_CODE(); |
| 1725 | |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1726 | bs = bdrv_new(); |
| 1727 | bs->open_flags = flags; |
Vladimir Sementsov-Ogievskiy | 621d173 | 2021-09-20 14:55:34 +0300 | [diff] [blame] | 1728 | bs->options = options ?: qdict_new(); |
| 1729 | bs->explicit_options = qdict_clone_shallow(bs->options); |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1730 | bs->opaque = NULL; |
| 1731 | |
| 1732 | update_options_from_flags(bs->options, flags); |
| 1733 | |
| 1734 | ret = bdrv_open_driver(bs, drv, node_name, bs->options, flags, errp); |
| 1735 | if (ret < 0) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1736 | qobject_unref(bs->explicit_options); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1737 | bs->explicit_options = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1738 | qobject_unref(bs->options); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1739 | bs->options = NULL; |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1740 | bdrv_unref(bs); |
| 1741 | return NULL; |
| 1742 | } |
| 1743 | |
| 1744 | return bs; |
| 1745 | } |
| 1746 | |
Vladimir Sementsov-Ogievskiy | 621d173 | 2021-09-20 14:55:34 +0300 | [diff] [blame] | 1747 | /* Create and open a block node. */ |
| 1748 | BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, |
| 1749 | int flags, Error **errp) |
| 1750 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 1751 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 621d173 | 2021-09-20 14:55:34 +0300 | [diff] [blame] | 1752 | return bdrv_new_open_driver_opts(drv, node_name, NULL, flags, errp); |
| 1753 | } |
| 1754 | |
Kevin Wolf | c5f3014 | 2016-10-06 11:33:17 +0200 | [diff] [blame] | 1755 | QemuOptsList bdrv_runtime_opts = { |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1756 | .name = "bdrv_common", |
| 1757 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_runtime_opts.head), |
| 1758 | .desc = { |
| 1759 | { |
| 1760 | .name = "node-name", |
| 1761 | .type = QEMU_OPT_STRING, |
| 1762 | .help = "Node name of the block device node", |
| 1763 | }, |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1764 | { |
| 1765 | .name = "driver", |
| 1766 | .type = QEMU_OPT_STRING, |
| 1767 | .help = "Block driver to use for the node", |
| 1768 | }, |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1769 | { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1770 | .name = BDRV_OPT_CACHE_DIRECT, |
| 1771 | .type = QEMU_OPT_BOOL, |
| 1772 | .help = "Bypass software writeback cache on the host", |
| 1773 | }, |
| 1774 | { |
| 1775 | .name = BDRV_OPT_CACHE_NO_FLUSH, |
| 1776 | .type = QEMU_OPT_BOOL, |
| 1777 | .help = "Ignore flush requests", |
| 1778 | }, |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1779 | { |
| 1780 | .name = BDRV_OPT_READ_ONLY, |
| 1781 | .type = QEMU_OPT_BOOL, |
| 1782 | .help = "Node is opened in read-only mode", |
| 1783 | }, |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1784 | { |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1785 | .name = BDRV_OPT_AUTO_READ_ONLY, |
| 1786 | .type = QEMU_OPT_BOOL, |
| 1787 | .help = "Node can become read-only if opening read-write fails", |
| 1788 | }, |
| 1789 | { |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1790 | .name = "detect-zeroes", |
| 1791 | .type = QEMU_OPT_STRING, |
| 1792 | .help = "try to optimize zero writes (off, on, unmap)", |
| 1793 | }, |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1794 | { |
Alberto Garcia | 415bbca | 2018-10-03 13:23:13 +0300 | [diff] [blame] | 1795 | .name = BDRV_OPT_DISCARD, |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1796 | .type = QEMU_OPT_STRING, |
| 1797 | .help = "discard operation (ignore/off, unmap/on)", |
| 1798 | }, |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 1799 | { |
| 1800 | .name = BDRV_OPT_FORCE_SHARE, |
| 1801 | .type = QEMU_OPT_BOOL, |
| 1802 | .help = "always accept other writers (default: off)", |
| 1803 | }, |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1804 | { /* end of list */ } |
| 1805 | }, |
| 1806 | }; |
| 1807 | |
Maxim Levitsky | 5a5e7f8 | 2020-03-26 03:12:18 +0200 | [diff] [blame] | 1808 | QemuOptsList bdrv_create_opts_simple = { |
| 1809 | .name = "simple-create-opts", |
| 1810 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_create_opts_simple.head), |
Max Reitz | fd17146 | 2020-01-22 17:45:29 +0100 | [diff] [blame] | 1811 | .desc = { |
| 1812 | { |
| 1813 | .name = BLOCK_OPT_SIZE, |
| 1814 | .type = QEMU_OPT_SIZE, |
| 1815 | .help = "Virtual disk size" |
| 1816 | }, |
| 1817 | { |
| 1818 | .name = BLOCK_OPT_PREALLOC, |
| 1819 | .type = QEMU_OPT_STRING, |
| 1820 | .help = "Preallocation mode (allowed values: off)" |
| 1821 | }, |
| 1822 | { /* end of list */ } |
| 1823 | } |
| 1824 | }; |
| 1825 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1826 | /* |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1827 | * Common part for opening disk images and files |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1828 | * |
| 1829 | * Removes all processed options from *options. |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1830 | */ |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1831 | static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file, |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1832 | QDict *options, Error **errp) |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1833 | { |
| 1834 | int ret, open_flags; |
Kevin Wolf | 035fccd | 2013-04-09 14:34:19 +0200 | [diff] [blame] | 1835 | const char *filename; |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1836 | const char *driver_name = NULL; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1837 | const char *node_name = NULL; |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1838 | const char *discard; |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1839 | QemuOpts *opts; |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1840 | BlockDriver *drv; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1841 | Error *local_err = NULL; |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1842 | bool ro; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1843 | |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 1844 | assert(bs->file == NULL); |
Kevin Wolf | 707ff82 | 2013-03-06 12:20:31 +0100 | [diff] [blame] | 1845 | assert(options != NULL && bs->options != options); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1846 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1847 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1848 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
Markus Armbruster | af175e8 | 2020-07-07 18:06:03 +0200 | [diff] [blame] | 1849 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1850 | ret = -EINVAL; |
| 1851 | goto fail_opts; |
| 1852 | } |
| 1853 | |
Alberto Garcia | 9b7e869 | 2016-09-15 17:53:01 +0300 | [diff] [blame] | 1854 | update_flags_from_options(&bs->open_flags, opts); |
| 1855 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1856 | driver_name = qemu_opt_get(opts, "driver"); |
| 1857 | drv = bdrv_find_format(driver_name); |
| 1858 | assert(drv != NULL); |
| 1859 | |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 1860 | bs->force_share = qemu_opt_get_bool(opts, BDRV_OPT_FORCE_SHARE, false); |
| 1861 | |
| 1862 | if (bs->force_share && (bs->open_flags & BDRV_O_RDWR)) { |
| 1863 | error_setg(errp, |
| 1864 | BDRV_OPT_FORCE_SHARE |
| 1865 | "=on can only be used with read-only images"); |
| 1866 | ret = -EINVAL; |
| 1867 | goto fail_opts; |
| 1868 | } |
| 1869 | |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1870 | if (file != NULL) { |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 1871 | bdrv_refresh_filename(blk_bs(file)); |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1872 | filename = blk_bs(file)->filename; |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1873 | } else { |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 1874 | /* |
| 1875 | * Caution: while qdict_get_try_str() is fine, getting |
| 1876 | * non-string types would require more care. When @options |
| 1877 | * come from -blockdev or blockdev_add, its members are typed |
| 1878 | * according to the QAPI schema, but when they come from |
| 1879 | * -drive, they're all QString. |
| 1880 | */ |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1881 | filename = qdict_get_try_str(options, "filename"); |
| 1882 | } |
| 1883 | |
Max Reitz | 4a00824 | 2017-04-13 18:06:24 +0200 | [diff] [blame] | 1884 | if (drv->bdrv_needs_filename && (!filename || !filename[0])) { |
Kevin Wolf | 765003d | 2014-02-03 14:49:42 +0100 | [diff] [blame] | 1885 | error_setg(errp, "The '%s' block driver requires a file name", |
| 1886 | drv->format_name); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1887 | ret = -EINVAL; |
| 1888 | goto fail_opts; |
| 1889 | } |
| 1890 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1891 | trace_bdrv_open_common(bs, filename ?: "", bs->open_flags, |
| 1892 | drv->format_name); |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1893 | |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1894 | ro = bdrv_is_read_only(bs); |
| 1895 | |
| 1896 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, ro)) { |
| 1897 | if (!ro && bdrv_is_whitelisted(drv, true)) { |
Kevin Wolf | 8be25de | 2019-01-22 13:15:31 +0100 | [diff] [blame] | 1898 | ret = bdrv_apply_auto_read_only(bs, NULL, NULL); |
| 1899 | } else { |
| 1900 | ret = -ENOTSUP; |
| 1901 | } |
| 1902 | if (ret < 0) { |
| 1903 | error_setg(errp, |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1904 | !ro && bdrv_is_whitelisted(drv, true) |
Kevin Wolf | 8be25de | 2019-01-22 13:15:31 +0100 | [diff] [blame] | 1905 | ? "Driver '%s' can only be used for read-only devices" |
| 1906 | : "Driver '%s' is not whitelisted", |
| 1907 | drv->format_name); |
| 1908 | goto fail_opts; |
| 1909 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 1910 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1911 | |
Paolo Bonzini | d3faa13 | 2017-06-05 14:38:50 +0200 | [diff] [blame] | 1912 | /* bdrv_new() and bdrv_close() make it so */ |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 1913 | assert(qatomic_read(&bs->copy_on_read) == 0); |
Paolo Bonzini | d3faa13 | 2017-06-05 14:38:50 +0200 | [diff] [blame] | 1914 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1915 | if (bs->open_flags & BDRV_O_COPY_ON_READ) { |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1916 | if (!ro) { |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 1917 | bdrv_enable_copy_on_read(bs); |
| 1918 | } else { |
| 1919 | 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] | 1920 | ret = -EINVAL; |
| 1921 | goto fail_opts; |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 1922 | } |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 1923 | } |
| 1924 | |
Alberto Garcia | 415bbca | 2018-10-03 13:23:13 +0300 | [diff] [blame] | 1925 | discard = qemu_opt_get(opts, BDRV_OPT_DISCARD); |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1926 | if (discard != NULL) { |
| 1927 | if (bdrv_parse_discard_flags(discard, &bs->open_flags) != 0) { |
| 1928 | error_setg(errp, "Invalid discard option"); |
| 1929 | ret = -EINVAL; |
| 1930 | goto fail_opts; |
| 1931 | } |
| 1932 | } |
| 1933 | |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 1934 | bs->detect_zeroes = |
| 1935 | bdrv_parse_detect_zeroes(opts, bs->open_flags, &local_err); |
| 1936 | if (local_err) { |
| 1937 | error_propagate(errp, local_err); |
| 1938 | ret = -EINVAL; |
| 1939 | goto fail_opts; |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1940 | } |
| 1941 | |
Kevin Wolf | c2ad1b0 | 2013-03-18 16:40:51 +0100 | [diff] [blame] | 1942 | if (filename != NULL) { |
| 1943 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
| 1944 | } else { |
| 1945 | bs->filename[0] = '\0'; |
| 1946 | } |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 1947 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1948 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1949 | /* Open the image, either directly or using a protocol */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1950 | open_flags = bdrv_open_flags(bs, bs->open_flags); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1951 | node_name = qemu_opt_get(opts, "node-name"); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1952 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1953 | assert(!drv->bdrv_file_open || file == NULL); |
| 1954 | ret = bdrv_open_driver(bs, drv, node_name, options, open_flags, errp); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1955 | if (ret < 0) { |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1956 | goto fail_opts; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1957 | } |
| 1958 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1959 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1960 | return 0; |
| 1961 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1962 | fail_opts: |
| 1963 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1964 | return ret; |
| 1965 | } |
| 1966 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1967 | static QDict *parse_json_filename(const char *filename, Error **errp) |
| 1968 | { |
| 1969 | QObject *options_obj; |
| 1970 | QDict *options; |
| 1971 | int ret; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 1972 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1973 | |
| 1974 | ret = strstart(filename, "json:", &filename); |
| 1975 | assert(ret); |
| 1976 | |
Markus Armbruster | 5577fff | 2017-02-28 22:26:59 +0100 | [diff] [blame] | 1977 | options_obj = qobject_from_json(filename, errp); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1978 | if (!options_obj) { |
Markus Armbruster | 5577fff | 2017-02-28 22:26:59 +0100 | [diff] [blame] | 1979 | error_prepend(errp, "Could not parse the JSON options: "); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1980 | return NULL; |
| 1981 | } |
| 1982 | |
Max Reitz | 7dc847e | 2018-02-24 16:40:29 +0100 | [diff] [blame] | 1983 | options = qobject_to(QDict, options_obj); |
Markus Armbruster | ca6b6e1 | 2017-02-17 21:38:18 +0100 | [diff] [blame] | 1984 | if (!options) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1985 | qobject_unref(options_obj); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1986 | error_setg(errp, "Invalid JSON object given"); |
| 1987 | return NULL; |
| 1988 | } |
| 1989 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1990 | qdict_flatten(options); |
| 1991 | |
| 1992 | return options; |
| 1993 | } |
| 1994 | |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 1995 | static void parse_json_protocol(QDict *options, const char **pfilename, |
| 1996 | Error **errp) |
| 1997 | { |
| 1998 | QDict *json_options; |
| 1999 | Error *local_err = NULL; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2000 | GLOBAL_STATE_CODE(); |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2001 | |
| 2002 | /* Parse json: pseudo-protocol */ |
| 2003 | if (!*pfilename || !g_str_has_prefix(*pfilename, "json:")) { |
| 2004 | return; |
| 2005 | } |
| 2006 | |
| 2007 | json_options = parse_json_filename(*pfilename, &local_err); |
| 2008 | if (local_err) { |
| 2009 | error_propagate(errp, local_err); |
| 2010 | return; |
| 2011 | } |
| 2012 | |
| 2013 | /* Options given in the filename have lower priority than options |
| 2014 | * specified directly */ |
| 2015 | qdict_join(options, json_options, false); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2016 | qobject_unref(json_options); |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2017 | *pfilename = NULL; |
| 2018 | } |
| 2019 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 2020 | /* |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2021 | * Fills in default options for opening images and converts the legacy |
| 2022 | * filename/flags pair to option QDict entries. |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2023 | * The BDRV_O_PROTOCOL flag in *flags will be set or cleared accordingly if a |
| 2024 | * block driver has been specified explicitly. |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2025 | */ |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2026 | static int bdrv_fill_options(QDict **options, const char *filename, |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2027 | int *flags, Error **errp) |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2028 | { |
| 2029 | const char *drvname; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2030 | bool protocol = *flags & BDRV_O_PROTOCOL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2031 | bool parse_filename = false; |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2032 | BlockDriver *drv = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2033 | Error *local_err = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2034 | |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2035 | GLOBAL_STATE_CODE(); |
| 2036 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2037 | /* |
| 2038 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 2039 | * types would require more care. When @options come from |
| 2040 | * -blockdev or blockdev_add, its members are typed according to |
| 2041 | * the QAPI schema, but when they come from -drive, they're all |
| 2042 | * QString. |
| 2043 | */ |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2044 | drvname = qdict_get_try_str(*options, "driver"); |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2045 | if (drvname) { |
| 2046 | drv = bdrv_find_format(drvname); |
| 2047 | if (!drv) { |
| 2048 | error_setg(errp, "Unknown driver '%s'", drvname); |
| 2049 | return -ENOENT; |
| 2050 | } |
| 2051 | /* If the user has explicitly specified the driver, this choice should |
| 2052 | * override the BDRV_O_PROTOCOL flag */ |
| 2053 | protocol = drv->bdrv_file_open; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2054 | } |
| 2055 | |
| 2056 | if (protocol) { |
| 2057 | *flags |= BDRV_O_PROTOCOL; |
| 2058 | } else { |
| 2059 | *flags &= ~BDRV_O_PROTOCOL; |
| 2060 | } |
| 2061 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 2062 | /* Translate cache options from flags into options */ |
| 2063 | update_options_from_flags(*options, *flags); |
| 2064 | |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2065 | /* Fetch the file name from the options QDict if necessary */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2066 | if (protocol && filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2067 | if (!qdict_haskey(*options, "filename")) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2068 | qdict_put_str(*options, "filename", filename); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2069 | parse_filename = true; |
| 2070 | } else { |
| 2071 | error_setg(errp, "Can't specify 'file' and 'filename' options at " |
| 2072 | "the same time"); |
| 2073 | return -EINVAL; |
| 2074 | } |
| 2075 | } |
| 2076 | |
| 2077 | /* Find the right block driver */ |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2078 | /* See cautionary note on accessing @options above */ |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2079 | filename = qdict_get_try_str(*options, "filename"); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2080 | |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2081 | if (!drvname && protocol) { |
| 2082 | if (filename) { |
| 2083 | drv = bdrv_find_protocol(filename, parse_filename, errp); |
| 2084 | if (!drv) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2085 | return -EINVAL; |
| 2086 | } |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2087 | |
| 2088 | drvname = drv->format_name; |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2089 | qdict_put_str(*options, "driver", drvname); |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 2090 | } else { |
| 2091 | error_setg(errp, "Must specify either driver or file"); |
| 2092 | return -EINVAL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2093 | } |
| 2094 | } |
| 2095 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2096 | assert(drv || !protocol); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2097 | |
| 2098 | /* Driver-specific filename parsing */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2099 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2100 | drv->bdrv_parse_filename(filename, *options, &local_err); |
| 2101 | if (local_err) { |
| 2102 | error_propagate(errp, local_err); |
| 2103 | return -EINVAL; |
| 2104 | } |
| 2105 | |
| 2106 | if (!drv->bdrv_needs_filename) { |
| 2107 | qdict_del(*options, "filename"); |
| 2108 | } |
| 2109 | } |
| 2110 | |
| 2111 | return 0; |
| 2112 | } |
| 2113 | |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2114 | typedef struct BlockReopenQueueEntry { |
| 2115 | bool prepared; |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 2116 | bool perms_checked; |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2117 | BDRVReopenState state; |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 2118 | QTAILQ_ENTRY(BlockReopenQueueEntry) entry; |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2119 | } BlockReopenQueueEntry; |
| 2120 | |
| 2121 | /* |
| 2122 | * Return the flags that @bs will have after the reopens in @q have |
| 2123 | * successfully completed. If @q is NULL (or @bs is not contained in @q), |
| 2124 | * return the current flags. |
| 2125 | */ |
| 2126 | static int bdrv_reopen_get_flags(BlockReopenQueue *q, BlockDriverState *bs) |
| 2127 | { |
| 2128 | BlockReopenQueueEntry *entry; |
| 2129 | |
| 2130 | if (q != NULL) { |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 2131 | QTAILQ_FOREACH(entry, q, entry) { |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2132 | if (entry->state.bs == bs) { |
| 2133 | return entry->state.flags; |
| 2134 | } |
| 2135 | } |
| 2136 | } |
| 2137 | |
| 2138 | return bs->open_flags; |
| 2139 | } |
| 2140 | |
| 2141 | /* Returns whether the image file can be written to after the reopen queue @q |
| 2142 | * has been successfully applied, or right now if @q is NULL. */ |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2143 | static bool bdrv_is_writable_after_reopen(BlockDriverState *bs, |
| 2144 | BlockReopenQueue *q) |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 2145 | { |
| 2146 | int flags = bdrv_reopen_get_flags(q, bs); |
| 2147 | |
| 2148 | return (flags & (BDRV_O_RDWR | BDRV_O_INACTIVE)) == BDRV_O_RDWR; |
| 2149 | } |
| 2150 | |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2151 | /* |
| 2152 | * Return whether the BDS can be written to. This is not necessarily |
| 2153 | * the same as !bdrv_is_read_only(bs), as inactivated images may not |
| 2154 | * be written to but do not count as read-only images. |
| 2155 | */ |
| 2156 | bool bdrv_is_writable(BlockDriverState *bs) |
| 2157 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 2158 | IO_CODE(); |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2159 | return bdrv_is_writable_after_reopen(bs, NULL); |
| 2160 | } |
| 2161 | |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2162 | static char *bdrv_child_user_desc(BdrvChild *c) |
| 2163 | { |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 2164 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | da261b6 | 2021-06-01 10:52:17 +0300 | [diff] [blame] | 2165 | return c->klass->get_parent_desc(c); |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2166 | } |
| 2167 | |
Vladimir Sementsov-Ogievskiy | 30ebb9a | 2021-06-01 10:52:18 +0300 | [diff] [blame] | 2168 | /* |
| 2169 | * Check that @a allows everything that @b needs. @a and @b must reference same |
| 2170 | * child node. |
| 2171 | */ |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2172 | static bool bdrv_a_allow_b(BdrvChild *a, BdrvChild *b, Error **errp) |
| 2173 | { |
Vladimir Sementsov-Ogievskiy | 30ebb9a | 2021-06-01 10:52:18 +0300 | [diff] [blame] | 2174 | const char *child_bs_name; |
| 2175 | g_autofree char *a_user = NULL; |
| 2176 | g_autofree char *b_user = NULL; |
| 2177 | g_autofree char *perms = NULL; |
| 2178 | |
| 2179 | assert(a->bs); |
| 2180 | assert(a->bs == b->bs); |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2181 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2182 | |
| 2183 | if ((b->perm & a->shared_perm) == b->perm) { |
| 2184 | return true; |
| 2185 | } |
| 2186 | |
Vladimir Sementsov-Ogievskiy | 30ebb9a | 2021-06-01 10:52:18 +0300 | [diff] [blame] | 2187 | child_bs_name = bdrv_get_node_name(b->bs); |
| 2188 | a_user = bdrv_child_user_desc(a); |
| 2189 | b_user = bdrv_child_user_desc(b); |
| 2190 | perms = bdrv_perm_names(b->perm & ~a->shared_perm); |
| 2191 | |
| 2192 | error_setg(errp, "Permission conflict on node '%s': permissions '%s' are " |
| 2193 | "both required by %s (uses node '%s' as '%s' child) and " |
| 2194 | "unshared by %s (uses node '%s' as '%s' child).", |
| 2195 | child_bs_name, perms, |
| 2196 | b_user, child_bs_name, b->name, |
| 2197 | a_user, child_bs_name, a->name); |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2198 | |
| 2199 | return false; |
| 2200 | } |
| 2201 | |
Vladimir Sementsov-Ogievskiy | 9397c14 | 2021-04-28 18:17:53 +0300 | [diff] [blame] | 2202 | static bool bdrv_parent_perms_conflict(BlockDriverState *bs, Error **errp) |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2203 | { |
| 2204 | BdrvChild *a, *b; |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2205 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2206 | |
| 2207 | /* |
| 2208 | * During the loop we'll look at each pair twice. That's correct because |
| 2209 | * bdrv_a_allow_b() is asymmetric and we should check each pair in both |
| 2210 | * directions. |
| 2211 | */ |
| 2212 | QLIST_FOREACH(a, &bs->parents, next_parent) { |
| 2213 | QLIST_FOREACH(b, &bs->parents, next_parent) { |
Vladimir Sementsov-Ogievskiy | 9397c14 | 2021-04-28 18:17:53 +0300 | [diff] [blame] | 2214 | if (a == b) { |
Vladimir Sementsov-Ogievskiy | 3bf416b | 2021-04-28 18:17:37 +0300 | [diff] [blame] | 2215 | continue; |
| 2216 | } |
| 2217 | |
| 2218 | if (!bdrv_a_allow_b(a, b, errp)) { |
| 2219 | return true; |
| 2220 | } |
| 2221 | } |
| 2222 | } |
| 2223 | |
| 2224 | return false; |
| 2225 | } |
| 2226 | |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 2227 | static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs, |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2228 | BdrvChild *c, BdrvChildRole role, |
| 2229 | BlockReopenQueue *reopen_queue, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 2230 | uint64_t parent_perm, uint64_t parent_shared, |
| 2231 | uint64_t *nperm, uint64_t *nshared) |
| 2232 | { |
Alberto Garcia | 0b3ca76 | 2019-04-04 14:29:53 +0300 | [diff] [blame] | 2233 | assert(bs->drv && bs->drv->bdrv_child_perm); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2234 | GLOBAL_STATE_CODE(); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2235 | bs->drv->bdrv_child_perm(bs, c, role, reopen_queue, |
Alberto Garcia | 0b3ca76 | 2019-04-04 14:29:53 +0300 | [diff] [blame] | 2236 | parent_perm, parent_shared, |
| 2237 | nperm, nshared); |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 2238 | /* TODO Take force_share from reopen_queue */ |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 2239 | if (child_bs && child_bs->force_share) { |
| 2240 | *nshared = BLK_PERM_ALL; |
| 2241 | } |
| 2242 | } |
| 2243 | |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2244 | /* |
| 2245 | * Adds the whole subtree of @bs (including @bs itself) to the @list (except for |
| 2246 | * nodes that are already in the @list, of course) so that final list is |
| 2247 | * topologically sorted. Return the result (GSList @list object is updated, so |
| 2248 | * don't use old reference after function call). |
| 2249 | * |
| 2250 | * On function start @list must be already topologically sorted and for any node |
| 2251 | * in the @list the whole subtree of the node must be in the @list as well. The |
| 2252 | * simplest way to satisfy this criteria: use only result of |
| 2253 | * bdrv_topological_dfs() or NULL as @list parameter. |
| 2254 | */ |
| 2255 | static GSList *bdrv_topological_dfs(GSList *list, GHashTable *found, |
| 2256 | BlockDriverState *bs) |
| 2257 | { |
| 2258 | BdrvChild *child; |
| 2259 | g_autoptr(GHashTable) local_found = NULL; |
| 2260 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2261 | GLOBAL_STATE_CODE(); |
| 2262 | |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2263 | if (!found) { |
| 2264 | assert(!list); |
| 2265 | found = local_found = g_hash_table_new(NULL, NULL); |
| 2266 | } |
| 2267 | |
| 2268 | if (g_hash_table_contains(found, bs)) { |
| 2269 | return list; |
| 2270 | } |
| 2271 | g_hash_table_add(found, bs); |
| 2272 | |
| 2273 | QLIST_FOREACH(child, &bs->children, next) { |
| 2274 | list = bdrv_topological_dfs(list, found, child->bs); |
| 2275 | } |
| 2276 | |
| 2277 | return g_slist_prepend(list, bs); |
| 2278 | } |
| 2279 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2280 | typedef struct BdrvChildSetPermState { |
| 2281 | BdrvChild *child; |
| 2282 | uint64_t old_perm; |
| 2283 | uint64_t old_shared_perm; |
| 2284 | } BdrvChildSetPermState; |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2285 | |
| 2286 | static void bdrv_child_set_perm_abort(void *opaque) |
| 2287 | { |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2288 | BdrvChildSetPermState *s = opaque; |
| 2289 | |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2290 | GLOBAL_STATE_CODE(); |
| 2291 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2292 | s->child->perm = s->old_perm; |
| 2293 | s->child->shared_perm = s->old_shared_perm; |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2294 | } |
| 2295 | |
| 2296 | static TransactionActionDrv bdrv_child_set_pem_drv = { |
| 2297 | .abort = bdrv_child_set_perm_abort, |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2298 | .clean = g_free, |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2299 | }; |
| 2300 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2301 | static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, |
| 2302 | uint64_t shared, Transaction *tran) |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2303 | { |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2304 | BdrvChildSetPermState *s = g_new(BdrvChildSetPermState, 1); |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2305 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2306 | |
| 2307 | *s = (BdrvChildSetPermState) { |
| 2308 | .child = c, |
| 2309 | .old_perm = c->perm, |
| 2310 | .old_shared_perm = c->shared_perm, |
| 2311 | }; |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2312 | |
| 2313 | c->perm = perm; |
| 2314 | c->shared_perm = shared; |
| 2315 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2316 | tran_add(tran, &bdrv_child_set_pem_drv, s); |
Vladimir Sementsov-Ogievskiy | b0defa8 | 2021-04-28 18:17:38 +0300 | [diff] [blame] | 2317 | } |
| 2318 | |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2319 | static void bdrv_drv_set_perm_commit(void *opaque) |
| 2320 | { |
| 2321 | BlockDriverState *bs = opaque; |
| 2322 | uint64_t cumulative_perms, cumulative_shared_perms; |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2323 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2324 | |
| 2325 | if (bs->drv->bdrv_set_perm) { |
| 2326 | bdrv_get_cumulative_perm(bs, &cumulative_perms, |
| 2327 | &cumulative_shared_perms); |
| 2328 | bs->drv->bdrv_set_perm(bs, cumulative_perms, cumulative_shared_perms); |
| 2329 | } |
| 2330 | } |
| 2331 | |
| 2332 | static void bdrv_drv_set_perm_abort(void *opaque) |
| 2333 | { |
| 2334 | BlockDriverState *bs = opaque; |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2335 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2336 | |
| 2337 | if (bs->drv->bdrv_abort_perm_update) { |
| 2338 | bs->drv->bdrv_abort_perm_update(bs); |
| 2339 | } |
| 2340 | } |
| 2341 | |
| 2342 | TransactionActionDrv bdrv_drv_set_perm_drv = { |
| 2343 | .abort = bdrv_drv_set_perm_abort, |
| 2344 | .commit = bdrv_drv_set_perm_commit, |
| 2345 | }; |
| 2346 | |
| 2347 | static int bdrv_drv_set_perm(BlockDriverState *bs, uint64_t perm, |
| 2348 | uint64_t shared_perm, Transaction *tran, |
| 2349 | Error **errp) |
| 2350 | { |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 2351 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 2513ef5 | 2021-04-28 18:17:42 +0300 | [diff] [blame] | 2352 | if (!bs->drv) { |
| 2353 | return 0; |
| 2354 | } |
| 2355 | |
| 2356 | if (bs->drv->bdrv_check_perm) { |
| 2357 | int ret = bs->drv->bdrv_check_perm(bs, perm, shared_perm, errp); |
| 2358 | if (ret < 0) { |
| 2359 | return ret; |
| 2360 | } |
| 2361 | } |
| 2362 | |
| 2363 | if (tran) { |
| 2364 | tran_add(tran, &bdrv_drv_set_perm_drv, bs); |
| 2365 | } |
| 2366 | |
| 2367 | return 0; |
| 2368 | } |
| 2369 | |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2370 | typedef struct BdrvReplaceChildState { |
| 2371 | BdrvChild *child; |
| 2372 | BlockDriverState *old_bs; |
| 2373 | } BdrvReplaceChildState; |
| 2374 | |
| 2375 | static void bdrv_replace_child_commit(void *opaque) |
| 2376 | { |
| 2377 | BdrvReplaceChildState *s = opaque; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2378 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2379 | |
| 2380 | bdrv_unref(s->old_bs); |
| 2381 | } |
| 2382 | |
| 2383 | static void bdrv_replace_child_abort(void *opaque) |
| 2384 | { |
| 2385 | BdrvReplaceChildState *s = opaque; |
| 2386 | BlockDriverState *new_bs = s->child->bs; |
| 2387 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2388 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 2389 | /* old_bs reference is transparently moved from @s to @s->child */ |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2390 | if (!s->child->bs) { |
| 2391 | /* |
| 2392 | * The parents were undrained when removing old_bs from the child. New |
| 2393 | * requests can't have been made, though, because the child was empty. |
| 2394 | * |
| 2395 | * TODO Make bdrv_replace_child_noperm() transactionable to avoid |
| 2396 | * undraining the parent in the first place. Once this is done, having |
| 2397 | * new_bs drained when calling bdrv_replace_child_tran() is not a |
| 2398 | * requirement any more. |
| 2399 | */ |
Kevin Wolf | 606ed75 | 2022-11-18 18:41:10 +0100 | [diff] [blame] | 2400 | bdrv_parent_drained_begin_single(s->child); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2401 | assert(!bdrv_parent_drained_poll_single(s->child)); |
| 2402 | } |
| 2403 | assert(s->child->quiesced_parent); |
Vladimir Sementsov-Ogievskiy | 544acc7 | 2022-07-26 23:11:31 +0300 | [diff] [blame] | 2404 | bdrv_replace_child_noperm(s->child, s->old_bs); |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2405 | bdrv_unref(new_bs); |
| 2406 | } |
| 2407 | |
| 2408 | static TransactionActionDrv bdrv_replace_child_drv = { |
| 2409 | .commit = bdrv_replace_child_commit, |
| 2410 | .abort = bdrv_replace_child_abort, |
| 2411 | .clean = g_free, |
| 2412 | }; |
| 2413 | |
| 2414 | /* |
Vladimir Sementsov-Ogievskiy | 4bf021d | 2021-06-10 14:25:44 +0300 | [diff] [blame] | 2415 | * bdrv_replace_child_tran |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2416 | * |
| 2417 | * Note: real unref of old_bs is done only on commit. |
Vladimir Sementsov-Ogievskiy | 4bf021d | 2021-06-10 14:25:44 +0300 | [diff] [blame] | 2418 | * |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2419 | * Both @child->bs and @new_bs (if non-NULL) must be drained. @new_bs must be |
| 2420 | * kept drained until the transaction is completed. |
| 2421 | * |
Vladimir Sementsov-Ogievskiy | 4bf021d | 2021-06-10 14:25:44 +0300 | [diff] [blame] | 2422 | * The function doesn't update permissions, caller is responsible for this. |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2423 | */ |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 2424 | static void bdrv_replace_child_tran(BdrvChild *child, BlockDriverState *new_bs, |
Vladimir Sementsov-Ogievskiy | 4eba825 | 2022-07-26 23:11:28 +0300 | [diff] [blame] | 2425 | Transaction *tran) |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2426 | { |
| 2427 | BdrvReplaceChildState *s = g_new(BdrvReplaceChildState, 1); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2428 | |
| 2429 | assert(child->quiesced_parent); |
| 2430 | assert(!new_bs || new_bs->quiesce_counter); |
| 2431 | |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2432 | *s = (BdrvReplaceChildState) { |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 2433 | .child = child, |
| 2434 | .old_bs = child->bs, |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2435 | }; |
| 2436 | tran_add(tran, &bdrv_replace_child_drv, s); |
| 2437 | |
| 2438 | if (new_bs) { |
| 2439 | bdrv_ref(new_bs); |
| 2440 | } |
Vladimir Sementsov-Ogievskiy | 544acc7 | 2022-07-26 23:11:31 +0300 | [diff] [blame] | 2441 | bdrv_replace_child_noperm(child, new_bs); |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 2442 | /* old_bs reference is transparently moved from @child to @s */ |
Vladimir Sementsov-Ogievskiy | 0978623 | 2021-04-28 18:17:44 +0300 | [diff] [blame] | 2443 | } |
| 2444 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2445 | /* |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2446 | * Refresh permissions in @bs subtree. The function is intended to be called |
| 2447 | * after some graph modification that was done without permission update. |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2448 | */ |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2449 | static int bdrv_node_refresh_perm(BlockDriverState *bs, BlockReopenQueue *q, |
| 2450 | Transaction *tran, Error **errp) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2451 | { |
| 2452 | BlockDriver *drv = bs->drv; |
| 2453 | BdrvChild *c; |
| 2454 | int ret; |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2455 | uint64_t cumulative_perms, cumulative_shared_perms; |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2456 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2457 | |
| 2458 | bdrv_get_cumulative_perm(bs, &cumulative_perms, &cumulative_shared_perms); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2459 | |
| 2460 | /* Write permissions never work with read-only images */ |
| 2461 | if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) && |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2462 | !bdrv_is_writable_after_reopen(bs, q)) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2463 | { |
Max Reitz | 481e0ee | 2019-05-15 22:15:00 +0200 | [diff] [blame] | 2464 | if (!bdrv_is_writable_after_reopen(bs, NULL)) { |
| 2465 | error_setg(errp, "Block node is read-only"); |
| 2466 | } else { |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2467 | error_setg(errp, "Read-only block node '%s' cannot support " |
| 2468 | "read-write users", bdrv_get_node_name(bs)); |
Max Reitz | 481e0ee | 2019-05-15 22:15:00 +0200 | [diff] [blame] | 2469 | } |
| 2470 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2471 | return -EPERM; |
| 2472 | } |
| 2473 | |
Kevin Wolf | 9c60a5d | 2020-07-16 16:26:00 +0200 | [diff] [blame] | 2474 | /* |
| 2475 | * Unaligned requests will automatically be aligned to bl.request_alignment |
| 2476 | * and without RESIZE we can't extend requests to write to space beyond the |
| 2477 | * end of the image, so it's required that the image size is aligned. |
| 2478 | */ |
| 2479 | if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) && |
| 2480 | !(cumulative_perms & BLK_PERM_RESIZE)) |
| 2481 | { |
| 2482 | if ((bs->total_sectors * BDRV_SECTOR_SIZE) % bs->bl.request_alignment) { |
| 2483 | error_setg(errp, "Cannot get 'write' permission without 'resize': " |
| 2484 | "Image size is not a multiple of request " |
| 2485 | "alignment"); |
| 2486 | return -EPERM; |
| 2487 | } |
| 2488 | } |
| 2489 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2490 | /* Check this node */ |
| 2491 | if (!drv) { |
| 2492 | return 0; |
| 2493 | } |
| 2494 | |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2495 | 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] | 2496 | errp); |
| 2497 | if (ret < 0) { |
| 2498 | return ret; |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2499 | } |
| 2500 | |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 2501 | /* Drivers that never have children can omit .bdrv_child_perm() */ |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2502 | if (!drv->bdrv_child_perm) { |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 2503 | assert(QLIST_EMPTY(&bs->children)); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2504 | return 0; |
| 2505 | } |
| 2506 | |
| 2507 | /* Check all children */ |
| 2508 | QLIST_FOREACH(c, &bs->children, next) { |
| 2509 | uint64_t cur_perm, cur_shared; |
Max Reitz | 9eab154 | 2019-05-22 19:03:50 +0200 | [diff] [blame] | 2510 | |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2511 | bdrv_child_perm(bs, c->bs, c, c->role, q, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 2512 | cumulative_perms, cumulative_shared_perms, |
| 2513 | &cur_perm, &cur_shared); |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2514 | bdrv_child_set_perm(c, cur_perm, cur_shared, tran); |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2515 | } |
| 2516 | |
| 2517 | return 0; |
| 2518 | } |
| 2519 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2520 | /* |
| 2521 | * @list is a product of bdrv_topological_dfs() (may be called several times) - |
| 2522 | * a topologically sorted subgraph. |
| 2523 | */ |
| 2524 | static int bdrv_do_refresh_perms(GSList *list, BlockReopenQueue *q, |
| 2525 | Transaction *tran, Error **errp) |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2526 | { |
| 2527 | int ret; |
| 2528 | BlockDriverState *bs; |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2529 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2530 | |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2531 | for ( ; list; list = list->next) { |
| 2532 | bs = list->data; |
| 2533 | |
Vladimir Sementsov-Ogievskiy | 9397c14 | 2021-04-28 18:17:53 +0300 | [diff] [blame] | 2534 | if (bdrv_parent_perms_conflict(bs, errp)) { |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2535 | return -EINVAL; |
| 2536 | } |
| 2537 | |
Vladimir Sementsov-Ogievskiy | c20555e | 2021-04-28 18:18:04 +0300 | [diff] [blame] | 2538 | ret = bdrv_node_refresh_perm(bs, q, tran, errp); |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2539 | if (ret < 0) { |
| 2540 | return ret; |
| 2541 | } |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2542 | } |
Vladimir Sementsov-Ogievskiy | 3ef45e0 | 2021-04-28 18:17:40 +0300 | [diff] [blame] | 2543 | |
Vladimir Sementsov-Ogievskiy | bd57f8f | 2021-04-28 18:17:41 +0300 | [diff] [blame] | 2544 | return 0; |
| 2545 | } |
| 2546 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2547 | /* |
| 2548 | * @list is any list of nodes. List is completed by all subtrees and |
| 2549 | * topologically sorted. It's not a problem if some node occurs in the @list |
| 2550 | * several times. |
| 2551 | */ |
| 2552 | static int bdrv_list_refresh_perms(GSList *list, BlockReopenQueue *q, |
| 2553 | Transaction *tran, Error **errp) |
| 2554 | { |
| 2555 | g_autoptr(GHashTable) found = g_hash_table_new(NULL, NULL); |
| 2556 | g_autoptr(GSList) refresh_list = NULL; |
| 2557 | |
| 2558 | for ( ; list; list = list->next) { |
| 2559 | refresh_list = bdrv_topological_dfs(refresh_list, found, list->data); |
| 2560 | } |
| 2561 | |
| 2562 | return bdrv_do_refresh_perms(refresh_list, q, tran, errp); |
| 2563 | } |
| 2564 | |
Kevin Wolf | c7a0f2b | 2020-03-10 12:38:25 +0100 | [diff] [blame] | 2565 | void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm, |
| 2566 | uint64_t *shared_perm) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2567 | { |
| 2568 | BdrvChild *c; |
| 2569 | uint64_t cumulative_perms = 0; |
| 2570 | uint64_t cumulative_shared_perms = BLK_PERM_ALL; |
| 2571 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 2572 | GLOBAL_STATE_CODE(); |
| 2573 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2574 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
| 2575 | cumulative_perms |= c->perm; |
| 2576 | cumulative_shared_perms &= c->shared_perm; |
| 2577 | } |
| 2578 | |
| 2579 | *perm = cumulative_perms; |
| 2580 | *shared_perm = cumulative_shared_perms; |
| 2581 | } |
| 2582 | |
Fam Zheng | 5176196 | 2017-05-03 00:35:36 +0800 | [diff] [blame] | 2583 | char *bdrv_perm_names(uint64_t perm) |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2584 | { |
| 2585 | struct perm_name { |
| 2586 | uint64_t perm; |
| 2587 | const char *name; |
| 2588 | } permissions[] = { |
| 2589 | { BLK_PERM_CONSISTENT_READ, "consistent read" }, |
| 2590 | { BLK_PERM_WRITE, "write" }, |
| 2591 | { BLK_PERM_WRITE_UNCHANGED, "write unchanged" }, |
| 2592 | { BLK_PERM_RESIZE, "resize" }, |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2593 | { 0, NULL } |
| 2594 | }; |
| 2595 | |
Alberto Garcia | e2a7423 | 2020-01-10 18:15:18 +0100 | [diff] [blame] | 2596 | GString *result = g_string_sized_new(30); |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2597 | struct perm_name *p; |
| 2598 | |
| 2599 | for (p = permissions; p->name; p++) { |
| 2600 | if (perm & p->perm) { |
Alberto Garcia | e2a7423 | 2020-01-10 18:15:18 +0100 | [diff] [blame] | 2601 | if (result->len > 0) { |
| 2602 | g_string_append(result, ", "); |
| 2603 | } |
| 2604 | g_string_append(result, p->name); |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2605 | } |
| 2606 | } |
| 2607 | |
Alberto Garcia | e2a7423 | 2020-01-10 18:15:18 +0100 | [diff] [blame] | 2608 | return g_string_free(result, FALSE); |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 2609 | } |
| 2610 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2611 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2612 | /* @tran is allowed to be NULL. In this case no rollback is possible */ |
| 2613 | static int bdrv_refresh_perms(BlockDriverState *bs, Transaction *tran, |
| 2614 | Error **errp) |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 2615 | { |
| 2616 | int ret; |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2617 | Transaction *local_tran = NULL; |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2618 | g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs); |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2619 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 2620 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2621 | if (!tran) { |
| 2622 | tran = local_tran = tran_new(); |
| 2623 | } |
| 2624 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 2625 | ret = bdrv_do_refresh_perms(list, NULL, tran, errp); |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2626 | |
| 2627 | if (local_tran) { |
| 2628 | tran_finalize(local_tran, ret); |
| 2629 | } |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 2630 | |
Vladimir Sementsov-Ogievskiy | b1d2bbe | 2021-04-28 18:17:43 +0300 | [diff] [blame] | 2631 | return ret; |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 2632 | } |
| 2633 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2634 | int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, |
| 2635 | Error **errp) |
| 2636 | { |
Max Reitz | 1046779 | 2019-05-22 19:03:51 +0200 | [diff] [blame] | 2637 | Error *local_err = NULL; |
Vladimir Sementsov-Ogievskiy | 83928dc | 2021-04-28 18:17:39 +0300 | [diff] [blame] | 2638 | Transaction *tran = tran_new(); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2639 | int ret; |
| 2640 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 2641 | GLOBAL_STATE_CODE(); |
| 2642 | |
Vladimir Sementsov-Ogievskiy | ecb776b | 2021-04-28 18:18:02 +0300 | [diff] [blame] | 2643 | bdrv_child_set_perm(c, perm, shared, tran); |
Vladimir Sementsov-Ogievskiy | 83928dc | 2021-04-28 18:17:39 +0300 | [diff] [blame] | 2644 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 2645 | ret = bdrv_refresh_perms(c->bs, tran, &local_err); |
Vladimir Sementsov-Ogievskiy | 83928dc | 2021-04-28 18:17:39 +0300 | [diff] [blame] | 2646 | |
| 2647 | tran_finalize(tran, ret); |
| 2648 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2649 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | 071b474 | 2020-11-06 15:42:41 +0300 | [diff] [blame] | 2650 | if ((perm & ~c->perm) || (c->shared_perm & ~shared)) { |
| 2651 | /* tighten permissions */ |
Max Reitz | 1046779 | 2019-05-22 19:03:51 +0200 | [diff] [blame] | 2652 | error_propagate(errp, local_err); |
| 2653 | } else { |
| 2654 | /* |
| 2655 | * Our caller may intend to only loosen restrictions and |
| 2656 | * does not expect this function to fail. Errors are not |
| 2657 | * fatal in such a case, so we can just hide them from our |
| 2658 | * caller. |
| 2659 | */ |
| 2660 | error_free(local_err); |
| 2661 | ret = 0; |
| 2662 | } |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2663 | } |
| 2664 | |
Vladimir Sementsov-Ogievskiy | 83928dc | 2021-04-28 18:17:39 +0300 | [diff] [blame] | 2665 | return ret; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2666 | } |
| 2667 | |
Max Reitz | c1087f1 | 2019-05-22 19:03:46 +0200 | [diff] [blame] | 2668 | int bdrv_child_refresh_perms(BlockDriverState *bs, BdrvChild *c, Error **errp) |
| 2669 | { |
| 2670 | uint64_t parent_perms, parent_shared; |
| 2671 | uint64_t perms, shared; |
| 2672 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 2673 | GLOBAL_STATE_CODE(); |
| 2674 | |
Max Reitz | c1087f1 | 2019-05-22 19:03:46 +0200 | [diff] [blame] | 2675 | bdrv_get_cumulative_perm(bs, &parent_perms, &parent_shared); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2676 | bdrv_child_perm(bs, c->bs, c, c->role, NULL, |
Max Reitz | bf8e925 | 2020-05-13 13:05:16 +0200 | [diff] [blame] | 2677 | parent_perms, parent_shared, &perms, &shared); |
Max Reitz | c1087f1 | 2019-05-22 19:03:46 +0200 | [diff] [blame] | 2678 | |
| 2679 | return bdrv_child_try_set_perm(c, perms, shared, errp); |
| 2680 | } |
| 2681 | |
Max Reitz | 87278af | 2020-05-13 13:05:40 +0200 | [diff] [blame] | 2682 | /* |
| 2683 | * Default implementation for .bdrv_child_perm() for block filters: |
| 2684 | * Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED, and RESIZE to the |
| 2685 | * filtered child. |
| 2686 | */ |
| 2687 | static void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c, |
Max Reitz | 87278af | 2020-05-13 13:05:40 +0200 | [diff] [blame] | 2688 | BdrvChildRole role, |
| 2689 | BlockReopenQueue *reopen_queue, |
| 2690 | uint64_t perm, uint64_t shared, |
| 2691 | uint64_t *nperm, uint64_t *nshared) |
Kevin Wolf | 6a1b9ee | 2016-12-15 11:27:32 +0100 | [diff] [blame] | 2692 | { |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2693 | GLOBAL_STATE_CODE(); |
Kevin Wolf | e444fa8 | 2019-08-02 15:59:41 +0200 | [diff] [blame] | 2694 | *nperm = perm & DEFAULT_PERM_PASSTHROUGH; |
| 2695 | *nshared = (shared & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHANGED; |
Kevin Wolf | 6a1b9ee | 2016-12-15 11:27:32 +0100 | [diff] [blame] | 2696 | } |
| 2697 | |
Max Reitz | 70082db | 2020-05-13 13:05:26 +0200 | [diff] [blame] | 2698 | static void bdrv_default_perms_for_cow(BlockDriverState *bs, BdrvChild *c, |
Max Reitz | 70082db | 2020-05-13 13:05:26 +0200 | [diff] [blame] | 2699 | BdrvChildRole role, |
| 2700 | BlockReopenQueue *reopen_queue, |
| 2701 | uint64_t perm, uint64_t shared, |
| 2702 | uint64_t *nperm, uint64_t *nshared) |
| 2703 | { |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2704 | assert(role & BDRV_CHILD_COW); |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2705 | GLOBAL_STATE_CODE(); |
Max Reitz | 70082db | 2020-05-13 13:05:26 +0200 | [diff] [blame] | 2706 | |
| 2707 | /* |
| 2708 | * We want consistent read from backing files if the parent needs it. |
| 2709 | * No other operations are performed on backing files. |
| 2710 | */ |
| 2711 | perm &= BLK_PERM_CONSISTENT_READ; |
| 2712 | |
| 2713 | /* |
| 2714 | * If the parent can deal with changing data, we're okay with a |
| 2715 | * writable and resizable backing file. |
| 2716 | * TODO Require !(perm & BLK_PERM_CONSISTENT_READ), too? |
| 2717 | */ |
| 2718 | if (shared & BLK_PERM_WRITE) { |
| 2719 | shared = BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2720 | } else { |
| 2721 | shared = 0; |
| 2722 | } |
| 2723 | |
Vladimir Sementsov-Ogievskiy | 64631f3 | 2021-09-02 12:37:54 +0300 | [diff] [blame] | 2724 | shared |= BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED; |
Max Reitz | 70082db | 2020-05-13 13:05:26 +0200 | [diff] [blame] | 2725 | |
| 2726 | if (bs->open_flags & BDRV_O_INACTIVE) { |
| 2727 | shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2728 | } |
| 2729 | |
| 2730 | *nperm = perm; |
| 2731 | *nshared = shared; |
| 2732 | } |
| 2733 | |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2734 | static void bdrv_default_perms_for_storage(BlockDriverState *bs, BdrvChild *c, |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2735 | BdrvChildRole role, |
| 2736 | BlockReopenQueue *reopen_queue, |
| 2737 | uint64_t perm, uint64_t shared, |
| 2738 | uint64_t *nperm, uint64_t *nshared) |
| 2739 | { |
| 2740 | int flags; |
| 2741 | |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 2742 | GLOBAL_STATE_CODE(); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2743 | assert(role & (BDRV_CHILD_METADATA | BDRV_CHILD_DATA)); |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2744 | |
| 2745 | flags = bdrv_reopen_get_flags(reopen_queue, bs); |
| 2746 | |
| 2747 | /* |
| 2748 | * Apart from the modifications below, the same permissions are |
| 2749 | * forwarded and left alone as for filters |
| 2750 | */ |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2751 | bdrv_filter_default_perms(bs, c, role, reopen_queue, |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2752 | perm, shared, &perm, &shared); |
| 2753 | |
Max Reitz | f889054 | 2020-05-13 13:05:28 +0200 | [diff] [blame] | 2754 | if (role & BDRV_CHILD_METADATA) { |
| 2755 | /* Format drivers may touch metadata even if the guest doesn't write */ |
| 2756 | if (bdrv_is_writable_after_reopen(bs, reopen_queue)) { |
| 2757 | perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2758 | } |
| 2759 | |
| 2760 | /* |
| 2761 | * bs->file always needs to be consistent because of the |
| 2762 | * metadata. We can never allow other users to resize or write |
| 2763 | * to it. |
| 2764 | */ |
| 2765 | if (!(flags & BDRV_O_NO_IO)) { |
| 2766 | perm |= BLK_PERM_CONSISTENT_READ; |
| 2767 | } |
| 2768 | shared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2769 | } |
| 2770 | |
Max Reitz | f889054 | 2020-05-13 13:05:28 +0200 | [diff] [blame] | 2771 | if (role & BDRV_CHILD_DATA) { |
| 2772 | /* |
| 2773 | * Technically, everything in this block is a subset of the |
| 2774 | * BDRV_CHILD_METADATA path taken above, and so this could |
| 2775 | * be an "else if" branch. However, that is not obvious, and |
| 2776 | * this function is not performance critical, therefore we let |
| 2777 | * this be an independent "if". |
| 2778 | */ |
| 2779 | |
| 2780 | /* |
| 2781 | * We cannot allow other users to resize the file because the |
| 2782 | * format driver might have some assumptions about the size |
| 2783 | * (e.g. because it is stored in metadata, or because the file |
| 2784 | * is split into fixed-size data files). |
| 2785 | */ |
| 2786 | shared &= ~BLK_PERM_RESIZE; |
| 2787 | |
| 2788 | /* |
| 2789 | * WRITE_UNCHANGED often cannot be performed as such on the |
| 2790 | * data file. For example, the qcow2 driver may still need to |
| 2791 | * write copied clusters on copy-on-read. |
| 2792 | */ |
| 2793 | if (perm & BLK_PERM_WRITE_UNCHANGED) { |
| 2794 | perm |= BLK_PERM_WRITE; |
| 2795 | } |
| 2796 | |
| 2797 | /* |
| 2798 | * If the data file is written to, the format driver may |
| 2799 | * expect to be able to resize it by writing beyond the EOF. |
| 2800 | */ |
| 2801 | if (perm & BLK_PERM_WRITE) { |
| 2802 | perm |= BLK_PERM_RESIZE; |
| 2803 | } |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2804 | } |
Max Reitz | 6f838a4 | 2020-05-13 13:05:27 +0200 | [diff] [blame] | 2805 | |
| 2806 | if (bs->open_flags & BDRV_O_INACTIVE) { |
| 2807 | shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2808 | } |
| 2809 | |
| 2810 | *nperm = perm; |
| 2811 | *nshared = shared; |
| 2812 | } |
| 2813 | |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2814 | void bdrv_default_perms(BlockDriverState *bs, BdrvChild *c, |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2815 | BdrvChildRole role, BlockReopenQueue *reopen_queue, |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2816 | uint64_t perm, uint64_t shared, |
| 2817 | uint64_t *nperm, uint64_t *nshared) |
| 2818 | { |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 2819 | GLOBAL_STATE_CODE(); |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2820 | if (role & BDRV_CHILD_FILTERED) { |
| 2821 | assert(!(role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA | |
| 2822 | BDRV_CHILD_COW))); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2823 | bdrv_filter_default_perms(bs, c, role, reopen_queue, |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2824 | perm, shared, nperm, nshared); |
| 2825 | } else if (role & BDRV_CHILD_COW) { |
| 2826 | assert(!(role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA))); |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2827 | bdrv_default_perms_for_cow(bs, c, role, reopen_queue, |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2828 | perm, shared, nperm, nshared); |
| 2829 | } else if (role & (BDRV_CHILD_METADATA | BDRV_CHILD_DATA)) { |
Max Reitz | e5d8a40 | 2020-05-13 13:05:44 +0200 | [diff] [blame] | 2830 | bdrv_default_perms_for_storage(bs, c, role, reopen_queue, |
Max Reitz | 2519f54 | 2020-05-13 13:05:29 +0200 | [diff] [blame] | 2831 | perm, shared, nperm, nshared); |
| 2832 | } else { |
| 2833 | g_assert_not_reached(); |
| 2834 | } |
| 2835 | } |
| 2836 | |
Max Reitz | 7b1d9c4 | 2019-11-08 13:34:51 +0100 | [diff] [blame] | 2837 | uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm) |
| 2838 | { |
| 2839 | static const uint64_t permissions[] = { |
| 2840 | [BLOCK_PERMISSION_CONSISTENT_READ] = BLK_PERM_CONSISTENT_READ, |
| 2841 | [BLOCK_PERMISSION_WRITE] = BLK_PERM_WRITE, |
| 2842 | [BLOCK_PERMISSION_WRITE_UNCHANGED] = BLK_PERM_WRITE_UNCHANGED, |
| 2843 | [BLOCK_PERMISSION_RESIZE] = BLK_PERM_RESIZE, |
Max Reitz | 7b1d9c4 | 2019-11-08 13:34:51 +0100 | [diff] [blame] | 2844 | }; |
| 2845 | |
| 2846 | QEMU_BUILD_BUG_ON(ARRAY_SIZE(permissions) != BLOCK_PERMISSION__MAX); |
| 2847 | QEMU_BUILD_BUG_ON(1UL << ARRAY_SIZE(permissions) != BLK_PERM_ALL + 1); |
| 2848 | |
| 2849 | assert(qapi_perm < BLOCK_PERMISSION__MAX); |
| 2850 | |
| 2851 | return permissions[qapi_perm]; |
| 2852 | } |
| 2853 | |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2854 | /* |
| 2855 | * Replaces the node that a BdrvChild points to without updating permissions. |
| 2856 | * |
| 2857 | * If @new_bs is non-NULL, the parent of @child must already be drained through |
Kevin Wolf | 31b2ddf | 2023-06-05 10:57:10 +0200 | [diff] [blame] | 2858 | * @child and the caller must hold the AioContext lock for @new_bs. |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2859 | */ |
Vladimir Sementsov-Ogievskiy | 544acc7 | 2022-07-26 23:11:31 +0300 | [diff] [blame] | 2860 | static void bdrv_replace_child_noperm(BdrvChild *child, |
Vladimir Sementsov-Ogievskiy | 4eba825 | 2022-07-26 23:11:28 +0300 | [diff] [blame] | 2861 | BlockDriverState *new_bs) |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2862 | { |
| 2863 | BlockDriverState *old_bs = child->bs; |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2864 | int new_bs_quiesce_counter; |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2865 | |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 2866 | assert(!child->frozen); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2867 | |
| 2868 | /* |
| 2869 | * If we want to change the BdrvChild to point to a drained node as its new |
| 2870 | * child->bs, we need to make sure that its new parent is drained, too. In |
| 2871 | * other words, either child->quiesce_parent must already be true or we must |
| 2872 | * be able to set it and keep the parent's quiesce_counter consistent with |
| 2873 | * that, but without polling or starting new requests (this function |
| 2874 | * guarantees that it doesn't poll, and starting new requests would be |
| 2875 | * against the invariants of drain sections). |
| 2876 | * |
| 2877 | * To keep things simple, we pick the first option (child->quiesce_parent |
| 2878 | * must already be true). We also generalise the rule a bit to make it |
| 2879 | * easier to verify in callers and more likely to be covered in test cases: |
| 2880 | * The parent must be quiesced through this child even if new_bs isn't |
| 2881 | * currently drained. |
| 2882 | * |
| 2883 | * The only exception is for callers that always pass new_bs == NULL. In |
| 2884 | * this case, we obviously never need to consider the case of a drained |
| 2885 | * new_bs, so we can keep the callers simpler by allowing them not to drain |
| 2886 | * the parent. |
| 2887 | */ |
| 2888 | assert(!new_bs || child->quiesced_parent); |
Kevin Wolf | bfb8aa6 | 2021-10-18 15:47:14 +0200 | [diff] [blame] | 2889 | assert(old_bs != new_bs); |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 2890 | GLOBAL_STATE_CODE(); |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 2891 | |
Fam Zheng | bb2614e | 2017-04-07 14:54:10 +0800 | [diff] [blame] | 2892 | if (old_bs && new_bs) { |
| 2893 | assert(bdrv_get_aio_context(old_bs) == bdrv_get_aio_context(new_bs)); |
| 2894 | } |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2895 | |
Emanuele Giuseppe Esposito | 2931250 | 2022-12-07 14:18:31 +0100 | [diff] [blame] | 2896 | /* TODO Pull this up into the callers to avoid polling here */ |
Kevin Wolf | 31b2ddf | 2023-06-05 10:57:10 +0200 | [diff] [blame] | 2897 | bdrv_graph_wrlock(new_bs); |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2898 | if (old_bs) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 2899 | if (child->klass->detach) { |
| 2900 | child->klass->detach(child); |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 2901 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2902 | QLIST_REMOVE(child, next_parent); |
| 2903 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2904 | |
| 2905 | child->bs = new_bs; |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2906 | |
| 2907 | if (new_bs) { |
| 2908 | QLIST_INSERT_HEAD(&new_bs->parents, child, next_parent); |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 2909 | if (child->klass->attach) { |
| 2910 | child->klass->attach(child); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 2911 | } |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2912 | } |
Emanuele Giuseppe Esposito | 2931250 | 2022-12-07 14:18:31 +0100 | [diff] [blame] | 2913 | bdrv_graph_wrunlock(); |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2914 | |
| 2915 | /* |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 2916 | * If the parent was drained through this BdrvChild previously, but new_bs |
| 2917 | * is not drained, allow requests to come in only after the new node has |
| 2918 | * been attached. |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2919 | */ |
Kevin Wolf | 57e05be | 2022-11-18 18:41:06 +0100 | [diff] [blame] | 2920 | new_bs_quiesce_counter = (new_bs ? new_bs->quiesce_counter : 0); |
| 2921 | if (!new_bs_quiesce_counter && child->quiesced_parent) { |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2922 | bdrv_parent_drained_end_single(child); |
Max Reitz | debc292 | 2019-07-22 15:33:44 +0200 | [diff] [blame] | 2923 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2924 | } |
| 2925 | |
Hanna Reitz | 04c9c3a | 2021-11-15 15:53:59 +0100 | [diff] [blame] | 2926 | /** |
| 2927 | * Free the given @child. |
| 2928 | * |
| 2929 | * The child must be empty (i.e. `child->bs == NULL`) and it must be |
| 2930 | * unused (i.e. not in a children list). |
| 2931 | */ |
| 2932 | static void bdrv_child_free(BdrvChild *child) |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 2933 | { |
| 2934 | assert(!child->bs); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 2935 | GLOBAL_STATE_CODE(); |
Hanna Reitz | a225369 | 2021-11-15 15:53:58 +0100 | [diff] [blame] | 2936 | assert(!child->next.le_prev); /* not in children list */ |
Hanna Reitz | 04c9c3a | 2021-11-15 15:53:59 +0100 | [diff] [blame] | 2937 | |
| 2938 | g_free(child->name); |
| 2939 | g_free(child); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 2940 | } |
| 2941 | |
| 2942 | typedef struct BdrvAttachChildCommonState { |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 2943 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 2944 | AioContext *old_parent_ctx; |
| 2945 | AioContext *old_child_ctx; |
| 2946 | } BdrvAttachChildCommonState; |
| 2947 | |
| 2948 | static void bdrv_attach_child_common_abort(void *opaque) |
| 2949 | { |
| 2950 | BdrvAttachChildCommonState *s = opaque; |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 2951 | BlockDriverState *bs = s->child->bs; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 2952 | |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 2953 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 2954 | bdrv_replace_child_noperm(s->child, NULL); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 2955 | |
| 2956 | if (bdrv_get_aio_context(bs) != s->old_child_ctx) { |
Emanuele Giuseppe Esposito | 142e690 | 2022-10-25 04:49:52 -0400 | [diff] [blame] | 2957 | 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] | 2958 | } |
| 2959 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 2960 | 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] | 2961 | Transaction *tran; |
| 2962 | GHashTable *visited; |
| 2963 | bool ret; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 2964 | |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 2965 | tran = tran_new(); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 2966 | |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 2967 | /* No need to visit `child`, because it has been detached already */ |
| 2968 | visited = g_hash_table_new(NULL, NULL); |
| 2969 | ret = s->child->klass->change_aio_ctx(s->child, s->old_parent_ctx, |
| 2970 | visited, tran, &error_abort); |
| 2971 | g_hash_table_destroy(visited); |
| 2972 | |
| 2973 | /* transaction is supposed to always succeed */ |
| 2974 | assert(ret == true); |
| 2975 | tran_commit(tran); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 2976 | } |
| 2977 | |
| 2978 | bdrv_unref(bs); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 2979 | bdrv_child_free(s->child); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 2980 | } |
| 2981 | |
| 2982 | static TransactionActionDrv bdrv_attach_child_common_drv = { |
| 2983 | .abort = bdrv_attach_child_common_abort, |
| 2984 | .clean = g_free, |
| 2985 | }; |
| 2986 | |
| 2987 | /* |
| 2988 | * 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] | 2989 | * |
Vladimir Sementsov-Ogievskiy | 7ec390d | 2021-06-10 14:25:45 +0300 | [diff] [blame] | 2990 | * Function doesn't update permissions, caller is responsible for this. |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 2991 | * |
| 2992 | * Returns new created child. |
Kevin Wolf | c066e80 | 2023-06-05 10:57:05 +0200 | [diff] [blame] | 2993 | * |
| 2994 | * The caller must hold the AioContext lock for @child_bs. Both @parent_bs and |
| 2995 | * @child_bs can move to a different AioContext in this function. Callers must |
| 2996 | * make sure that their AioContext locking is still correct after this. |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 2997 | */ |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 2998 | static BdrvChild *bdrv_attach_child_common(BlockDriverState *child_bs, |
| 2999 | const char *child_name, |
| 3000 | const BdrvChildClass *child_class, |
| 3001 | BdrvChildRole child_role, |
| 3002 | uint64_t perm, uint64_t shared_perm, |
| 3003 | void *opaque, |
| 3004 | Transaction *tran, Error **errp) |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3005 | { |
| 3006 | BdrvChild *new_child; |
Kevin Wolf | c066e80 | 2023-06-05 10:57:05 +0200 | [diff] [blame] | 3007 | AioContext *parent_ctx, *new_child_ctx; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3008 | AioContext *child_ctx = bdrv_get_aio_context(child_bs); |
| 3009 | |
Vladimir Sementsov-Ogievskiy | da261b6 | 2021-06-01 10:52:17 +0300 | [diff] [blame] | 3010 | assert(child_class->get_parent_desc); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3011 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3012 | |
| 3013 | new_child = g_new(BdrvChild, 1); |
| 3014 | *new_child = (BdrvChild) { |
| 3015 | .bs = NULL, |
| 3016 | .name = g_strdup(child_name), |
| 3017 | .klass = child_class, |
| 3018 | .role = child_role, |
| 3019 | .perm = perm, |
| 3020 | .shared_perm = shared_perm, |
| 3021 | .opaque = opaque, |
| 3022 | }; |
| 3023 | |
| 3024 | /* |
| 3025 | * If the AioContexts don't match, first try to move the subtree of |
| 3026 | * child_bs into the AioContext of the new parent. If this doesn't work, |
| 3027 | * try moving the parent into the AioContext of child_bs instead. |
| 3028 | */ |
| 3029 | parent_ctx = bdrv_child_get_parent_aio_context(new_child); |
| 3030 | if (child_ctx != parent_ctx) { |
| 3031 | Error *local_err = NULL; |
Emanuele Giuseppe Esposito | 142e690 | 2022-10-25 04:49:52 -0400 | [diff] [blame] | 3032 | int ret = bdrv_try_change_aio_context(child_bs, parent_ctx, NULL, |
| 3033 | &local_err); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3034 | |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3035 | if (ret < 0 && child_class->change_aio_ctx) { |
| 3036 | Transaction *tran = tran_new(); |
| 3037 | GHashTable *visited = g_hash_table_new(NULL, NULL); |
| 3038 | bool ret_child; |
| 3039 | |
| 3040 | g_hash_table_add(visited, new_child); |
| 3041 | ret_child = child_class->change_aio_ctx(new_child, child_ctx, |
| 3042 | visited, tran, NULL); |
| 3043 | if (ret_child == true) { |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3044 | error_free(local_err); |
| 3045 | ret = 0; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3046 | } |
Emanuele Giuseppe Esposito | f8be48a | 2022-10-25 04:49:49 -0400 | [diff] [blame] | 3047 | tran_finalize(tran, ret_child == true ? 0 : -1); |
| 3048 | g_hash_table_destroy(visited); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3049 | } |
| 3050 | |
| 3051 | if (ret < 0) { |
| 3052 | error_propagate(errp, local_err); |
Hanna Reitz | 04c9c3a | 2021-11-15 15:53:59 +0100 | [diff] [blame] | 3053 | bdrv_child_free(new_child); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3054 | return NULL; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3055 | } |
| 3056 | } |
| 3057 | |
Kevin Wolf | c066e80 | 2023-06-05 10:57:05 +0200 | [diff] [blame] | 3058 | new_child_ctx = bdrv_get_aio_context(child_bs); |
| 3059 | if (new_child_ctx != child_ctx) { |
| 3060 | aio_context_release(child_ctx); |
| 3061 | aio_context_acquire(new_child_ctx); |
| 3062 | } |
| 3063 | |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3064 | bdrv_ref(child_bs); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 3065 | /* |
| 3066 | * Let every new BdrvChild start with a drained parent. Inserting the child |
| 3067 | * in the graph with bdrv_replace_child_noperm() will undrain it if |
| 3068 | * @child_bs is not drained. |
| 3069 | * |
| 3070 | * The child was only just created and is not yet visible in global state |
| 3071 | * until bdrv_replace_child_noperm() inserts it into the graph, so nobody |
| 3072 | * could have sent requests and polling is not necessary. |
| 3073 | * |
| 3074 | * Note that this means that the parent isn't fully drained yet, we only |
| 3075 | * stop new requests from coming in. This is fine, we don't care about the |
| 3076 | * old requests here, they are not for this child. If another place enters a |
| 3077 | * drain section for the same parent, but wants it to be fully quiesced, it |
| 3078 | * will not run most of the the code in .drained_begin() again (which is not |
| 3079 | * a problem, we already did this), but it will still poll until the parent |
| 3080 | * is fully quiesced, so it will not be negatively affected either. |
| 3081 | */ |
Kevin Wolf | 606ed75 | 2022-11-18 18:41:10 +0100 | [diff] [blame] | 3082 | bdrv_parent_drained_begin_single(new_child); |
Vladimir Sementsov-Ogievskiy | 544acc7 | 2022-07-26 23:11:31 +0300 | [diff] [blame] | 3083 | bdrv_replace_child_noperm(new_child, child_bs); |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3084 | |
| 3085 | BdrvAttachChildCommonState *s = g_new(BdrvAttachChildCommonState, 1); |
| 3086 | *s = (BdrvAttachChildCommonState) { |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3087 | .child = new_child, |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3088 | .old_parent_ctx = parent_ctx, |
| 3089 | .old_child_ctx = child_ctx, |
| 3090 | }; |
| 3091 | tran_add(tran, &bdrv_attach_child_common_drv, s); |
| 3092 | |
Kevin Wolf | c066e80 | 2023-06-05 10:57:05 +0200 | [diff] [blame] | 3093 | if (new_child_ctx != child_ctx) { |
| 3094 | aio_context_release(new_child_ctx); |
| 3095 | aio_context_acquire(child_ctx); |
| 3096 | } |
| 3097 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3098 | return new_child; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3099 | } |
| 3100 | |
Vladimir Sementsov-Ogievskiy | f8d2ad7 | 2021-06-01 10:52:13 +0300 | [diff] [blame] | 3101 | /* |
Vladimir Sementsov-Ogievskiy | 7ec390d | 2021-06-10 14:25:45 +0300 | [diff] [blame] | 3102 | * Function doesn't update permissions, caller is responsible for this. |
Kevin Wolf | c066e80 | 2023-06-05 10:57:05 +0200 | [diff] [blame] | 3103 | * |
| 3104 | * The caller must hold the AioContext lock for @child_bs. Both @parent_bs and |
| 3105 | * @child_bs can move to a different AioContext in this function. Callers must |
| 3106 | * make sure that their AioContext locking is still correct after this. |
Vladimir Sementsov-Ogievskiy | f8d2ad7 | 2021-06-01 10:52:13 +0300 | [diff] [blame] | 3107 | */ |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3108 | static BdrvChild *bdrv_attach_child_noperm(BlockDriverState *parent_bs, |
| 3109 | BlockDriverState *child_bs, |
| 3110 | const char *child_name, |
| 3111 | const BdrvChildClass *child_class, |
| 3112 | BdrvChildRole child_role, |
| 3113 | Transaction *tran, |
| 3114 | Error **errp) |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3115 | { |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3116 | uint64_t perm, shared_perm; |
| 3117 | |
| 3118 | assert(parent_bs->drv); |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3119 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3120 | |
Kevin Wolf | bfb8aa6 | 2021-10-18 15:47:14 +0200 | [diff] [blame] | 3121 | if (bdrv_recurse_has_child(child_bs, parent_bs)) { |
| 3122 | error_setg(errp, "Making '%s' a %s child of '%s' would create a cycle", |
| 3123 | child_bs->node_name, child_name, parent_bs->node_name); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3124 | return NULL; |
Kevin Wolf | bfb8aa6 | 2021-10-18 15:47:14 +0200 | [diff] [blame] | 3125 | } |
| 3126 | |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3127 | bdrv_get_cumulative_perm(parent_bs, &perm, &shared_perm); |
| 3128 | bdrv_child_perm(parent_bs, child_bs, NULL, child_role, NULL, |
| 3129 | perm, shared_perm, &perm, &shared_perm); |
| 3130 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3131 | return bdrv_attach_child_common(child_bs, child_name, child_class, |
| 3132 | child_role, perm, shared_perm, parent_bs, |
| 3133 | tran, errp); |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3134 | } |
| 3135 | |
Alberto Garcia | b441dc7 | 2019-05-13 16:46:18 +0300 | [diff] [blame] | 3136 | /* |
| 3137 | * This function steals the reference to child_bs from the caller. |
| 3138 | * That reference is later dropped by bdrv_root_unref_child(). |
| 3139 | * |
| 3140 | * On failure NULL is returned, errp is set and the reference to |
| 3141 | * child_bs is also dropped. |
Kevin Wolf | 132ada8 | 2019-04-24 17:41:46 +0200 | [diff] [blame] | 3142 | * |
| 3143 | * The caller must hold the AioContext lock @child_bs, but not that of @ctx |
| 3144 | * (unless @child_bs is already in @ctx). |
Alberto Garcia | b441dc7 | 2019-05-13 16:46:18 +0300 | [diff] [blame] | 3145 | */ |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3146 | BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, |
| 3147 | const char *child_name, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3148 | const BdrvChildClass *child_class, |
Max Reitz | 258b776 | 2020-05-13 13:05:15 +0200 | [diff] [blame] | 3149 | BdrvChildRole child_role, |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3150 | uint64_t perm, uint64_t shared_perm, |
| 3151 | void *opaque, Error **errp) |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3152 | { |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3153 | int ret; |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3154 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3155 | Transaction *tran = tran_new(); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3156 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 3157 | GLOBAL_STATE_CODE(); |
| 3158 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3159 | child = bdrv_attach_child_common(child_bs, child_name, child_class, |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3160 | child_role, perm, shared_perm, opaque, |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3161 | tran, errp); |
| 3162 | if (!child) { |
| 3163 | ret = -EINVAL; |
Kevin Wolf | e878bb1 | 2021-05-03 13:05:54 +0200 | [diff] [blame] | 3164 | goto out; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3165 | } |
| 3166 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 3167 | ret = bdrv_refresh_perms(child_bs, tran, errp); |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3168 | |
Kevin Wolf | e878bb1 | 2021-05-03 13:05:54 +0200 | [diff] [blame] | 3169 | out: |
| 3170 | tran_finalize(tran, ret); |
Vladimir Sementsov-Ogievskiy | f8d2ad7 | 2021-06-01 10:52:13 +0300 | [diff] [blame] | 3171 | |
Vladimir Sementsov-Ogievskiy | 548a74c | 2021-04-28 18:17:46 +0300 | [diff] [blame] | 3172 | bdrv_unref(child_bs); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3173 | |
| 3174 | return ret < 0 ? NULL : child; |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3175 | } |
| 3176 | |
Alberto Garcia | b441dc7 | 2019-05-13 16:46:18 +0300 | [diff] [blame] | 3177 | /* |
| 3178 | * This function transfers the reference to child_bs from the caller |
| 3179 | * to parent_bs. That reference is later dropped by parent_bs on |
| 3180 | * bdrv_close() or if someone calls bdrv_unref_child(). |
| 3181 | * |
| 3182 | * On failure NULL is returned, errp is set and the reference to |
| 3183 | * child_bs is also dropped. |
Kevin Wolf | 132ada8 | 2019-04-24 17:41:46 +0200 | [diff] [blame] | 3184 | * |
| 3185 | * If @parent_bs and @child_bs are in different AioContexts, the caller must |
| 3186 | * hold the AioContext lock for @child_bs, but not for @parent_bs. |
Alberto Garcia | b441dc7 | 2019-05-13 16:46:18 +0300 | [diff] [blame] | 3187 | */ |
Wen Congyang | 98292c6 | 2016-05-10 15:36:38 +0800 | [diff] [blame] | 3188 | BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, |
| 3189 | BlockDriverState *child_bs, |
| 3190 | const char *child_name, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3191 | const BdrvChildClass *child_class, |
Max Reitz | 258b776 | 2020-05-13 13:05:15 +0200 | [diff] [blame] | 3192 | BdrvChildRole child_role, |
Kevin Wolf | 8b2ff52 | 2016-12-20 22:21:17 +0100 | [diff] [blame] | 3193 | Error **errp) |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3194 | { |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3195 | int ret; |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3196 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3197 | Transaction *tran = tran_new(); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3198 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3199 | GLOBAL_STATE_CODE(); |
| 3200 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3201 | child = bdrv_attach_child_noperm(parent_bs, child_bs, child_name, |
| 3202 | child_class, child_role, tran, errp); |
| 3203 | if (!child) { |
| 3204 | ret = -EINVAL; |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3205 | goto out; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 3206 | } |
| 3207 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 3208 | ret = bdrv_refresh_perms(parent_bs, tran, errp); |
Vladimir Sementsov-Ogievskiy | aa5a04c | 2021-04-28 18:17:47 +0300 | [diff] [blame] | 3209 | if (ret < 0) { |
| 3210 | goto out; |
| 3211 | } |
| 3212 | |
| 3213 | out: |
| 3214 | tran_finalize(tran, ret); |
| 3215 | |
| 3216 | bdrv_unref(child_bs); |
| 3217 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3218 | return ret < 0 ? NULL : child; |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3219 | } |
| 3220 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 3221 | /* Callers must ensure that child->frozen is false. */ |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3222 | void bdrv_root_unref_child(BdrvChild *child) |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 3223 | { |
Vladimir Sementsov-Ogievskiy | 00eb93b | 2022-11-07 19:35:55 +0300 | [diff] [blame] | 3224 | BlockDriverState *child_bs = child->bs; |
Kevin Wolf | 779020c | 2015-10-13 14:09:44 +0200 | [diff] [blame] | 3225 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3226 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 00eb93b | 2022-11-07 19:35:55 +0300 | [diff] [blame] | 3227 | bdrv_replace_child_noperm(child, NULL); |
| 3228 | bdrv_child_free(child); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3229 | |
Vladimir Sementsov-Ogievskiy | 00eb93b | 2022-11-07 19:35:55 +0300 | [diff] [blame] | 3230 | if (child_bs) { |
| 3231 | /* |
| 3232 | * Update permissions for old node. We're just taking a parent away, so |
| 3233 | * we're loosening restrictions. Errors of permission update are not |
| 3234 | * fatal in this case, ignore them. |
| 3235 | */ |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 3236 | bdrv_refresh_perms(child_bs, NULL, NULL); |
Vladimir Sementsov-Ogievskiy | 00eb93b | 2022-11-07 19:35:55 +0300 | [diff] [blame] | 3237 | |
| 3238 | /* |
| 3239 | * When the parent requiring a non-default AioContext is removed, the |
| 3240 | * node moves back to the main AioContext |
| 3241 | */ |
| 3242 | bdrv_try_change_aio_context(child_bs, qemu_get_aio_context(), NULL, |
| 3243 | NULL); |
| 3244 | } |
| 3245 | |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3246 | bdrv_unref(child_bs); |
| 3247 | } |
| 3248 | |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3249 | typedef struct BdrvSetInheritsFrom { |
| 3250 | BlockDriverState *bs; |
| 3251 | BlockDriverState *old_inherits_from; |
| 3252 | } BdrvSetInheritsFrom; |
| 3253 | |
| 3254 | static void bdrv_set_inherits_from_abort(void *opaque) |
| 3255 | { |
| 3256 | BdrvSetInheritsFrom *s = opaque; |
| 3257 | |
| 3258 | s->bs->inherits_from = s->old_inherits_from; |
| 3259 | } |
| 3260 | |
| 3261 | static TransactionActionDrv bdrv_set_inherits_from_drv = { |
| 3262 | .abort = bdrv_set_inherits_from_abort, |
| 3263 | .clean = g_free, |
| 3264 | }; |
| 3265 | |
| 3266 | /* @tran is allowed to be NULL. In this case no rollback is possible */ |
| 3267 | static void bdrv_set_inherits_from(BlockDriverState *bs, |
| 3268 | BlockDriverState *new_inherits_from, |
| 3269 | Transaction *tran) |
| 3270 | { |
| 3271 | if (tran) { |
| 3272 | BdrvSetInheritsFrom *s = g_new(BdrvSetInheritsFrom, 1); |
| 3273 | |
| 3274 | *s = (BdrvSetInheritsFrom) { |
| 3275 | .bs = bs, |
| 3276 | .old_inherits_from = bs->inherits_from, |
| 3277 | }; |
| 3278 | |
| 3279 | tran_add(tran, &bdrv_set_inherits_from_drv, s); |
| 3280 | } |
| 3281 | |
| 3282 | bs->inherits_from = new_inherits_from; |
| 3283 | } |
| 3284 | |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3285 | /** |
| 3286 | * Clear all inherits_from pointers from children and grandchildren of |
| 3287 | * @root that point to @root, where necessary. |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3288 | * @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] | 3289 | */ |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3290 | static void bdrv_unset_inherits_from(BlockDriverState *root, BdrvChild *child, |
| 3291 | Transaction *tran) |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3292 | { |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3293 | BdrvChild *c; |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 3294 | |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3295 | if (child->bs->inherits_from == root) { |
| 3296 | /* |
| 3297 | * Remove inherits_from only when the last reference between root and |
| 3298 | * child->bs goes away. |
| 3299 | */ |
| 3300 | QLIST_FOREACH(c, &root->children, next) { |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 3301 | if (c != child && c->bs == child->bs) { |
| 3302 | break; |
| 3303 | } |
| 3304 | } |
| 3305 | if (c == NULL) { |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3306 | bdrv_set_inherits_from(child->bs, NULL, tran); |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 3307 | } |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 3308 | } |
| 3309 | |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3310 | QLIST_FOREACH(c, &child->bs->children, next) { |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3311 | bdrv_unset_inherits_from(root, c, tran); |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3312 | } |
| 3313 | } |
| 3314 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 3315 | /* Callers must ensure that child->frozen is false. */ |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3316 | void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) |
| 3317 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3318 | GLOBAL_STATE_CODE(); |
Max Reitz | 3cf746b | 2019-07-03 19:28:07 +0200 | [diff] [blame] | 3319 | if (child == NULL) { |
| 3320 | return; |
| 3321 | } |
| 3322 | |
Vladimir Sementsov-Ogievskiy | 332b3a1 | 2021-04-28 18:17:54 +0300 | [diff] [blame] | 3323 | bdrv_unset_inherits_from(parent, child, NULL); |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 3324 | bdrv_root_unref_child(child); |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 3325 | } |
| 3326 | |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 3327 | |
| 3328 | static void bdrv_parent_cb_change_media(BlockDriverState *bs, bool load) |
| 3329 | { |
| 3330 | BdrvChild *c; |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 3331 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 3332 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3333 | if (c->klass->change_media) { |
| 3334 | c->klass->change_media(c, load); |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 3335 | } |
| 3336 | } |
| 3337 | } |
| 3338 | |
Alberto Garcia | 0065c45 | 2018-10-31 18:16:37 +0200 | [diff] [blame] | 3339 | /* Return true if you can reach parent going through child->inherits_from |
| 3340 | * recursively. If parent or child are NULL, return false */ |
| 3341 | static bool bdrv_inherits_from_recursive(BlockDriverState *child, |
| 3342 | BlockDriverState *parent) |
| 3343 | { |
| 3344 | while (child && child != parent) { |
| 3345 | child = child->inherits_from; |
| 3346 | } |
| 3347 | |
| 3348 | return child != NULL; |
| 3349 | } |
| 3350 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3351 | /* |
Max Reitz | 25191e5 | 2020-05-13 13:05:33 +0200 | [diff] [blame] | 3352 | * Return the BdrvChildRole for @bs's backing child. bs->backing is |
| 3353 | * mostly used for COW backing children (role = COW), but also for |
| 3354 | * filtered children (role = FILTERED | PRIMARY). |
| 3355 | */ |
| 3356 | static BdrvChildRole bdrv_backing_role(BlockDriverState *bs) |
| 3357 | { |
| 3358 | if (bs->drv && bs->drv->is_filter) { |
| 3359 | return BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY; |
| 3360 | } else { |
| 3361 | return BDRV_CHILD_COW; |
| 3362 | } |
| 3363 | } |
| 3364 | |
| 3365 | /* |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3366 | * Sets the bs->backing or bs->file link of a BDS. A new reference is created; |
| 3367 | * 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] | 3368 | * |
| 3369 | * Function doesn't update permissions, caller is responsible for this. |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 3370 | * |
| 3371 | * The caller must hold the AioContext lock for @child_bs. Both @parent_bs and |
| 3372 | * @child_bs can move to a different AioContext in this function. Callers must |
| 3373 | * make sure that their AioContext locking is still correct after this. |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3374 | */ |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3375 | static int bdrv_set_file_or_backing_noperm(BlockDriverState *parent_bs, |
| 3376 | BlockDriverState *child_bs, |
| 3377 | bool is_backing, |
| 3378 | Transaction *tran, Error **errp) |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3379 | { |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3380 | bool update_inherits_from = |
| 3381 | bdrv_inherits_from_recursive(child_bs, parent_bs); |
| 3382 | BdrvChild *child = is_backing ? parent_bs->backing : parent_bs->file; |
| 3383 | BdrvChildRole role; |
Alberto Garcia | 0065c45 | 2018-10-31 18:16:37 +0200 | [diff] [blame] | 3384 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3385 | GLOBAL_STATE_CODE(); |
| 3386 | |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3387 | if (!parent_bs->drv) { |
| 3388 | /* |
| 3389 | * Node without drv is an object without a class :/. TODO: finally fix |
| 3390 | * qcow2 driver to never clear bs->drv and implement format corruption |
| 3391 | * handling in other way. |
| 3392 | */ |
| 3393 | error_setg(errp, "Node corrupted"); |
| 3394 | return -EINVAL; |
| 3395 | } |
| 3396 | |
| 3397 | if (child && child->frozen) { |
| 3398 | error_setg(errp, "Cannot change frozen '%s' link from '%s' to '%s'", |
| 3399 | child->name, parent_bs->node_name, child->bs->node_name); |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3400 | return -EPERM; |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 3401 | } |
| 3402 | |
Vladimir Sementsov-Ogievskiy | 25f78d9 | 2021-06-10 15:05:34 +0300 | [diff] [blame] | 3403 | if (is_backing && !parent_bs->drv->is_filter && |
| 3404 | !parent_bs->drv->supports_backing) |
| 3405 | { |
| 3406 | error_setg(errp, "Driver '%s' of node '%s' does not support backing " |
| 3407 | "files", parent_bs->drv->format_name, parent_bs->node_name); |
| 3408 | return -EINVAL; |
| 3409 | } |
| 3410 | |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3411 | if (parent_bs->drv->is_filter) { |
| 3412 | role = BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY; |
| 3413 | } else if (is_backing) { |
| 3414 | role = BDRV_CHILD_COW; |
| 3415 | } else { |
| 3416 | /* |
| 3417 | * We only can use same role as it is in existing child. We don't have |
| 3418 | * infrastructure to determine role of file child in generic way |
| 3419 | */ |
| 3420 | if (!child) { |
| 3421 | error_setg(errp, "Cannot set file child to format node without " |
| 3422 | "file child"); |
| 3423 | return -EINVAL; |
| 3424 | } |
| 3425 | role = child->role; |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 3426 | } |
| 3427 | |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3428 | if (child) { |
| 3429 | bdrv_unset_inherits_from(parent_bs, child, tran); |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 3430 | bdrv_remove_child(child, tran); |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3431 | } |
| 3432 | |
| 3433 | if (!child_bs) { |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3434 | goto out; |
| 3435 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 3436 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3437 | child = bdrv_attach_child_noperm(parent_bs, child_bs, |
| 3438 | is_backing ? "backing" : "file", |
| 3439 | &child_of_bds, role, |
| 3440 | tran, errp); |
| 3441 | if (!child) { |
| 3442 | return -EINVAL; |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3443 | } |
| 3444 | |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3445 | |
| 3446 | /* |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3447 | * 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] | 3448 | * point directly to bs (else it will become NULL). |
| 3449 | */ |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3450 | if (update_inherits_from) { |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3451 | bdrv_set_inherits_from(child_bs, parent_bs, tran); |
Alberto Garcia | 0065c45 | 2018-10-31 18:16:37 +0200 | [diff] [blame] | 3452 | } |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 3453 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3454 | out: |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 3455 | bdrv_graph_rdlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3456 | bdrv_refresh_limits(parent_bs, tran, NULL); |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 3457 | bdrv_graph_rdunlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3458 | |
| 3459 | return 0; |
| 3460 | } |
| 3461 | |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 3462 | /* |
| 3463 | * The caller must hold the AioContext lock for @backing_hd. Both @bs and |
| 3464 | * @backing_hd can move to a different AioContext in this function. Callers must |
| 3465 | * make sure that their AioContext locking is still correct after this. |
| 3466 | */ |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3467 | static int bdrv_set_backing_noperm(BlockDriverState *bs, |
| 3468 | BlockDriverState *backing_hd, |
| 3469 | Transaction *tran, Error **errp) |
| 3470 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3471 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | e923827 | 2021-06-10 15:05:30 +0300 | [diff] [blame] | 3472 | return bdrv_set_file_or_backing_noperm(bs, backing_hd, true, tran, errp); |
| 3473 | } |
| 3474 | |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3475 | int bdrv_set_backing_hd_drained(BlockDriverState *bs, |
| 3476 | BlockDriverState *backing_hd, |
| 3477 | Error **errp) |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3478 | { |
| 3479 | int ret; |
| 3480 | Transaction *tran = tran_new(); |
| 3481 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3482 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3483 | assert(bs->quiesce_counter > 0); |
Vladimir Sementsov-Ogievskiy | c0829cb | 2022-01-24 18:37:41 +0100 | [diff] [blame] | 3484 | |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3485 | ret = bdrv_set_backing_noperm(bs, backing_hd, tran, errp); |
| 3486 | if (ret < 0) { |
| 3487 | goto out; |
| 3488 | } |
| 3489 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 3490 | ret = bdrv_refresh_perms(bs, tran, errp); |
Vladimir Sementsov-Ogievskiy | 160333e | 2021-04-28 18:17:56 +0300 | [diff] [blame] | 3491 | out: |
| 3492 | tran_finalize(tran, ret); |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3493 | return ret; |
| 3494 | } |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3495 | |
Kevin Wolf | 92140b9 | 2022-11-18 18:41:04 +0100 | [diff] [blame] | 3496 | int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, |
| 3497 | Error **errp) |
| 3498 | { |
| 3499 | int ret; |
| 3500 | GLOBAL_STATE_CODE(); |
| 3501 | |
| 3502 | bdrv_drained_begin(bs); |
| 3503 | ret = bdrv_set_backing_hd_drained(bs, backing_hd, errp); |
Vladimir Sementsov-Ogievskiy | c0829cb | 2022-01-24 18:37:41 +0100 | [diff] [blame] | 3504 | bdrv_drained_end(bs); |
| 3505 | |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 3506 | return ret; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3507 | } |
| 3508 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 3509 | /* |
| 3510 | * Opens the backing file for a BlockDriverState if not yet open |
| 3511 | * |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3512 | * bdref_key specifies the key for the image's BlockdevRef in the options QDict. |
| 3513 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 3514 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 3515 | * BlockdevRef. |
| 3516 | * |
Kevin Wolf | 2626d27 | 2023-05-25 14:47:06 +0200 | [diff] [blame] | 3517 | * The caller must hold the main AioContext lock. |
| 3518 | * |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3519 | * TODO Can this be unified with bdrv_open_image()? |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 3520 | */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3521 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, |
| 3522 | const char *bdref_key, Error **errp) |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3523 | { |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 3524 | char *backing_filename = NULL; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3525 | char *bdref_key_dot; |
| 3526 | const char *reference = NULL; |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 3527 | int ret = 0; |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 3528 | bool implicit_backing = false; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 3529 | BlockDriverState *backing_hd; |
Kevin Wolf | 8aa0454 | 2023-06-05 10:57:08 +0200 | [diff] [blame] | 3530 | AioContext *backing_hd_ctx; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3531 | QDict *options; |
| 3532 | QDict *tmp_parent_options = NULL; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 3533 | Error *local_err = NULL; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3534 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3535 | GLOBAL_STATE_CODE(); |
| 3536 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3537 | if (bs->backing != NULL) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3538 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3539 | } |
| 3540 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 3541 | /* NULL means an empty set of options */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3542 | if (parent_options == NULL) { |
| 3543 | tmp_parent_options = qdict_new(); |
| 3544 | parent_options = tmp_parent_options; |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 3545 | } |
| 3546 | |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3547 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3548 | |
| 3549 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 3550 | qdict_extract_subqdict(parent_options, &options, bdref_key_dot); |
| 3551 | g_free(bdref_key_dot); |
| 3552 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 3553 | /* |
| 3554 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 3555 | * types would require more care. When @parent_options come from |
| 3556 | * -blockdev or blockdev_add, its members are typed according to |
| 3557 | * the QAPI schema, but when they come from -drive, they're all |
| 3558 | * QString. |
| 3559 | */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3560 | reference = qdict_get_try_str(parent_options, bdref_key); |
| 3561 | if (reference || qdict_haskey(options, "file.filename")) { |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 3562 | /* keep backing_filename NULL */ |
Kevin Wolf | 1cb6f50 | 2013-04-12 20:27:07 +0200 | [diff] [blame] | 3563 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3564 | qobject_unref(options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3565 | goto free_exit; |
Fam Zheng | dbecebd | 2013-09-22 20:05:06 +0800 | [diff] [blame] | 3566 | } else { |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 3567 | if (qdict_size(options) == 0) { |
| 3568 | /* If the user specifies options that do not modify the |
| 3569 | * backing file's behavior, we might still consider it the |
| 3570 | * implicit backing file. But it's easier this way, and |
| 3571 | * just specifying some of the backing BDS's options is |
| 3572 | * only possible with -drive anyway (otherwise the QAPI |
| 3573 | * schema forces the user to specify everything). */ |
| 3574 | implicit_backing = !strcmp(bs->auto_backing_file, bs->backing_file); |
| 3575 | } |
| 3576 | |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 3577 | backing_filename = bdrv_get_full_backing_filename(bs, &local_err); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 3578 | if (local_err) { |
| 3579 | ret = -EINVAL; |
| 3580 | error_propagate(errp, local_err); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3581 | qobject_unref(options); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 3582 | goto free_exit; |
| 3583 | } |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3584 | } |
| 3585 | |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 3586 | if (!bs->drv || !bs->drv->supports_backing) { |
| 3587 | ret = -EINVAL; |
| 3588 | error_setg(errp, "Driver doesn't support backing files"); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3589 | qobject_unref(options); |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 3590 | goto free_exit; |
| 3591 | } |
| 3592 | |
Peter Krempa | 6bff597 | 2017-10-12 16:14:10 +0200 | [diff] [blame] | 3593 | if (!reference && |
| 3594 | bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 3595 | qdict_put_str(options, "driver", bs->backing_format); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3596 | } |
| 3597 | |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 3598 | backing_hd = bdrv_open_inherit(backing_filename, reference, options, 0, bs, |
Max Reitz | 25191e5 | 2020-05-13 13:05:33 +0200 | [diff] [blame] | 3599 | &child_of_bds, bdrv_backing_role(bs), errp); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3600 | if (!backing_hd) { |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3601 | bs->open_flags |= BDRV_O_NO_BACKING; |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 3602 | error_prepend(errp, "Could not open backing file: "); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3603 | ret = -EINVAL; |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3604 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3605 | } |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3606 | |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 3607 | if (implicit_backing) { |
| 3608 | bdrv_refresh_filename(backing_hd); |
| 3609 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), |
| 3610 | backing_hd->filename); |
| 3611 | } |
| 3612 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3613 | /* Hook up the backing file link; drop our reference, bs owns the |
| 3614 | * backing_hd reference now */ |
Kevin Wolf | 8aa0454 | 2023-06-05 10:57:08 +0200 | [diff] [blame] | 3615 | backing_hd_ctx = bdrv_get_aio_context(backing_hd); |
| 3616 | aio_context_acquire(backing_hd_ctx); |
Vladimir Sementsov-Ogievskiy | dc9c10a | 2021-02-02 15:49:47 +0300 | [diff] [blame] | 3617 | ret = bdrv_set_backing_hd(bs, backing_hd, errp); |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3618 | bdrv_unref(backing_hd); |
Kevin Wolf | 8aa0454 | 2023-06-05 10:57:08 +0200 | [diff] [blame] | 3619 | aio_context_release(backing_hd_ctx); |
| 3620 | |
Vladimir Sementsov-Ogievskiy | dc9c10a | 2021-02-02 15:49:47 +0300 | [diff] [blame] | 3621 | if (ret < 0) { |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 3622 | goto free_exit; |
| 3623 | } |
Peter Feiner | d80ac65 | 2014-01-08 19:43:25 +0000 | [diff] [blame] | 3624 | |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 3625 | qdict_del(parent_options, bdref_key); |
| 3626 | |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3627 | free_exit: |
| 3628 | g_free(backing_filename); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3629 | qobject_unref(tmp_parent_options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3630 | return ret; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 3631 | } |
| 3632 | |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3633 | static BlockDriverState * |
| 3634 | 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] | 3635 | BlockDriverState *parent, const BdrvChildClass *child_class, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 3636 | BdrvChildRole child_role, bool allow_none, Error **errp) |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3637 | { |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3638 | BlockDriverState *bs = NULL; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3639 | QDict *image_options; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3640 | char *bdref_key_dot; |
| 3641 | const char *reference; |
| 3642 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3643 | assert(child_class != NULL); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3644 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3645 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 3646 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); |
| 3647 | g_free(bdref_key_dot); |
| 3648 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 3649 | /* |
| 3650 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 3651 | * types would require more care. When @options come from |
| 3652 | * -blockdev or blockdev_add, its members are typed according to |
| 3653 | * the QAPI schema, but when they come from -drive, they're all |
| 3654 | * QString. |
| 3655 | */ |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3656 | reference = qdict_get_try_str(options, bdref_key); |
| 3657 | if (!filename && !reference && !qdict_size(image_options)) { |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 3658 | if (!allow_none) { |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3659 | error_setg(errp, "A block device must be specified for \"%s\"", |
| 3660 | bdref_key); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3661 | } |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3662 | qobject_unref(image_options); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3663 | goto done; |
| 3664 | } |
| 3665 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3666 | bs = bdrv_open_inherit(filename, reference, image_options, 0, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 3667 | parent, child_class, child_role, errp); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3668 | if (!bs) { |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 3669 | goto done; |
| 3670 | } |
| 3671 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3672 | done: |
| 3673 | qdict_del(options, bdref_key); |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3674 | return bs; |
| 3675 | } |
| 3676 | |
| 3677 | /* |
| 3678 | * Opens a disk image whose options are given as BlockdevRef in another block |
| 3679 | * device's options. |
| 3680 | * |
| 3681 | * If allow_none is true, no image will be opened if filename is false and no |
| 3682 | * BlockdevRef is given. NULL will be returned, but errp remains unset. |
| 3683 | * |
| 3684 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. |
| 3685 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 3686 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 3687 | * BlockdevRef. |
| 3688 | * |
| 3689 | * The BlockdevRef will be removed from the options QDict. |
Kevin Wolf | aa269ff | 2023-05-25 14:47:07 +0200 | [diff] [blame] | 3690 | * |
Kevin Wolf | 8394c35 | 2023-06-05 10:57:04 +0200 | [diff] [blame] | 3691 | * The caller must hold the lock of the main AioContext and no other AioContext. |
Kevin Wolf | aa269ff | 2023-05-25 14:47:07 +0200 | [diff] [blame] | 3692 | * @parent can move to a different AioContext in this function. Callers must |
| 3693 | * make sure that their AioContext locking is still correct after this. |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3694 | */ |
| 3695 | BdrvChild *bdrv_open_child(const char *filename, |
| 3696 | QDict *options, const char *bdref_key, |
| 3697 | BlockDriverState *parent, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3698 | const BdrvChildClass *child_class, |
Max Reitz | 258b776 | 2020-05-13 13:05:15 +0200 | [diff] [blame] | 3699 | BdrvChildRole child_role, |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3700 | bool allow_none, Error **errp) |
| 3701 | { |
| 3702 | BlockDriverState *bs; |
Kevin Wolf | 8394c35 | 2023-06-05 10:57:04 +0200 | [diff] [blame] | 3703 | BdrvChild *child; |
| 3704 | AioContext *ctx; |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3705 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3706 | GLOBAL_STATE_CODE(); |
| 3707 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3708 | bs = bdrv_open_child_bs(filename, options, bdref_key, parent, child_class, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 3709 | child_role, allow_none, errp); |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 3710 | if (bs == NULL) { |
| 3711 | return NULL; |
| 3712 | } |
| 3713 | |
Kevin Wolf | 8394c35 | 2023-06-05 10:57:04 +0200 | [diff] [blame] | 3714 | ctx = bdrv_get_aio_context(bs); |
| 3715 | aio_context_acquire(ctx); |
| 3716 | child = bdrv_attach_child(parent, bs, bdref_key, child_class, child_role, |
| 3717 | errp); |
| 3718 | aio_context_release(ctx); |
| 3719 | |
| 3720 | return child; |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 3721 | } |
| 3722 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3723 | /* |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3724 | * 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] | 3725 | * |
Kevin Wolf | 8394c35 | 2023-06-05 10:57:04 +0200 | [diff] [blame] | 3726 | * The caller must hold the lock of the main AioContext and no other AioContext. |
Kevin Wolf | aa269ff | 2023-05-25 14:47:07 +0200 | [diff] [blame] | 3727 | * @parent can move to a different AioContext in this function. Callers must |
| 3728 | * make sure that their AioContext locking is still correct after this. |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3729 | */ |
| 3730 | int bdrv_open_file_child(const char *filename, |
| 3731 | QDict *options, const char *bdref_key, |
| 3732 | BlockDriverState *parent, Error **errp) |
| 3733 | { |
| 3734 | BdrvChildRole role; |
| 3735 | |
| 3736 | /* commit_top and mirror_top don't use this function */ |
| 3737 | assert(!parent->drv->filtered_child_is_backing); |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3738 | role = parent->drv->is_filter ? |
| 3739 | (BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY) : BDRV_CHILD_IMAGE; |
| 3740 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3741 | if (!bdrv_open_child(filename, options, bdref_key, parent, |
| 3742 | &child_of_bds, role, false, errp)) |
| 3743 | { |
| 3744 | return -EINVAL; |
| 3745 | } |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3746 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 3747 | return 0; |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 3748 | } |
| 3749 | |
| 3750 | /* |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3751 | * TODO Future callers may need to specify parent/child_class in order for |
| 3752 | * option inheritance to work. Existing callers use it for the root node. |
| 3753 | */ |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3754 | BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp) |
| 3755 | { |
| 3756 | BlockDriverState *bs = NULL; |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3757 | QObject *obj = NULL; |
| 3758 | QDict *qdict = NULL; |
| 3759 | const char *reference = NULL; |
| 3760 | Visitor *v = NULL; |
| 3761 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 3762 | GLOBAL_STATE_CODE(); |
| 3763 | |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3764 | if (ref->type == QTYPE_QSTRING) { |
| 3765 | reference = ref->u.reference; |
| 3766 | } else { |
| 3767 | BlockdevOptions *options = &ref->u.definition; |
| 3768 | assert(ref->type == QTYPE_QDICT); |
| 3769 | |
| 3770 | v = qobject_output_visitor_new(&obj); |
Markus Armbruster | 1f58424 | 2020-04-24 10:43:35 +0200 | [diff] [blame] | 3771 | visit_type_BlockdevOptions(v, NULL, &options, &error_abort); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3772 | visit_complete(v, &obj); |
| 3773 | |
Max Reitz | 7dc847e | 2018-02-24 16:40:29 +0100 | [diff] [blame] | 3774 | qdict = qobject_to(QDict, obj); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3775 | qdict_flatten(qdict); |
| 3776 | |
| 3777 | /* bdrv_open_inherit() defaults to the values in bdrv_flags (for |
| 3778 | * compatibility with other callers) rather than what we want as the |
| 3779 | * real defaults. Apply the defaults here instead. */ |
| 3780 | qdict_set_default_str(qdict, BDRV_OPT_CACHE_DIRECT, "off"); |
| 3781 | qdict_set_default_str(qdict, BDRV_OPT_CACHE_NO_FLUSH, "off"); |
| 3782 | qdict_set_default_str(qdict, BDRV_OPT_READ_ONLY, "off"); |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 3783 | qdict_set_default_str(qdict, BDRV_OPT_AUTO_READ_ONLY, "off"); |
| 3784 | |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3785 | } |
| 3786 | |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 3787 | bs = bdrv_open_inherit(NULL, reference, qdict, 0, NULL, NULL, 0, errp); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3788 | obj = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3789 | qobject_unref(obj); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3790 | visit_free(v); |
| 3791 | return bs; |
| 3792 | } |
| 3793 | |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 3794 | static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs, |
| 3795 | int flags, |
| 3796 | QDict *snapshot_options, |
| 3797 | Error **errp) |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3798 | { |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 3799 | g_autofree char *tmp_filename = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3800 | int64_t total_size; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3801 | QemuOpts *opts = NULL; |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 3802 | BlockDriverState *bs_snapshot = NULL; |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 3803 | AioContext *ctx = bdrv_get_aio_context(bs); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3804 | int ret; |
| 3805 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 3806 | GLOBAL_STATE_CODE(); |
| 3807 | |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3808 | /* if snapshot, we create a temporary backing file and open it |
| 3809 | instead of opening 'filename' directly */ |
| 3810 | |
| 3811 | /* Get the required size from the image */ |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 3812 | aio_context_acquire(ctx); |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 3813 | total_size = bdrv_getlength(bs); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 3814 | aio_context_release(ctx); |
| 3815 | |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 3816 | if (total_size < 0) { |
| 3817 | error_setg_errno(errp, -total_size, "Could not get image size"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3818 | goto out; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 3819 | } |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3820 | |
| 3821 | /* Create the temporary image */ |
Bin Meng | 69fbfff | 2022-10-10 12:04:31 +0800 | [diff] [blame] | 3822 | tmp_filename = create_tmp_file(errp); |
| 3823 | if (!tmp_filename) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3824 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3825 | } |
| 3826 | |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 3827 | opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0, |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 3828 | &error_abort); |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 3829 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size, &error_abort); |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 3830 | ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, errp); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3831 | qemu_opts_del(opts); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3832 | if (ret < 0) { |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 3833 | error_prepend(errp, "Could not create temporary overlay '%s': ", |
| 3834 | tmp_filename); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3835 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3836 | } |
| 3837 | |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 3838 | /* Prepare options QDict for the temporary file */ |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 3839 | qdict_put_str(snapshot_options, "file.driver", "file"); |
| 3840 | qdict_put_str(snapshot_options, "file.filename", tmp_filename); |
| 3841 | qdict_put_str(snapshot_options, "driver", "qcow2"); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3842 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3843 | bs_snapshot = bdrv_open(NULL, NULL, snapshot_options, flags, errp); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 3844 | snapshot_options = NULL; |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3845 | if (!bs_snapshot) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3846 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3847 | } |
| 3848 | |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 3849 | aio_context_acquire(ctx); |
Vladimir Sementsov-Ogievskiy | 934aee1 | 2021-02-02 15:49:44 +0300 | [diff] [blame] | 3850 | ret = bdrv_append(bs_snapshot, bs, errp); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 3851 | aio_context_release(ctx); |
| 3852 | |
Vladimir Sementsov-Ogievskiy | 934aee1 | 2021-02-02 15:49:44 +0300 | [diff] [blame] | 3853 | if (ret < 0) { |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 3854 | bs_snapshot = NULL; |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 3855 | goto out; |
| 3856 | } |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 3857 | |
| 3858 | out: |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3859 | qobject_unref(snapshot_options); |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 3860 | return bs_snapshot; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 3861 | } |
| 3862 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 3863 | /* |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 3864 | * Opens a disk image (raw, qcow2, vmdk, ...) |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 3865 | * |
| 3866 | * options is a QDict of options to pass to the block drivers, or NULL for an |
| 3867 | * empty set of options. The reference to the QDict belongs to the block layer |
| 3868 | * 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] | 3869 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3870 | * |
| 3871 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. |
| 3872 | * If it is not NULL, the referenced BDS will be reused. |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3873 | * |
| 3874 | * The reference parameter may be used to specify an existing block device which |
| 3875 | * should be opened. If specified, neither options nor a filename may be given, |
| 3876 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 3877 | * |
Kevin Wolf | ae400db | 2023-05-25 14:47:03 +0200 | [diff] [blame] | 3878 | * The caller must always hold the main AioContext lock. |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 3879 | */ |
Kevin Wolf | 3219230 | 2023-01-26 18:24:32 +0100 | [diff] [blame] | 3880 | static BlockDriverState * no_coroutine_fn |
| 3881 | bdrv_open_inherit(const char *filename, const char *reference, QDict *options, |
| 3882 | int flags, BlockDriverState *parent, |
| 3883 | const BdrvChildClass *child_class, BdrvChildRole child_role, |
| 3884 | Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3885 | { |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 3886 | int ret; |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 3887 | BlockBackend *file = NULL; |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 3888 | BlockDriverState *bs; |
Max Reitz | ce34377 | 2015-08-26 19:47:50 +0200 | [diff] [blame] | 3889 | BlockDriver *drv = NULL; |
Alberto Garcia | 2f624b8 | 2018-06-29 14:37:00 +0300 | [diff] [blame] | 3890 | BdrvChild *child; |
Kevin Wolf | 74fe54f | 2013-07-09 11:09:02 +0200 | [diff] [blame] | 3891 | const char *drvname; |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 3892 | const char *backing; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 3893 | Error *local_err = NULL; |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 3894 | QDict *snapshot_options = NULL; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 3895 | int snapshot_flags = 0; |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 3896 | AioContext *ctx = qemu_get_aio_context(); |
bellard | 712e787 | 2005-04-28 21:09:32 +0000 | [diff] [blame] | 3897 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3898 | assert(!child_class || !flags); |
| 3899 | assert(!child_class == !parent); |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 3900 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 3219230 | 2023-01-26 18:24:32 +0100 | [diff] [blame] | 3901 | assert(!qemu_in_coroutine()); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3902 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3903 | if (reference) { |
| 3904 | bool options_non_empty = options ? qdict_size(options) : false; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3905 | qobject_unref(options); |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3906 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3907 | if (filename || options_non_empty) { |
| 3908 | error_setg(errp, "Cannot reference an existing block device with " |
| 3909 | "additional options or a new filename"); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3910 | return NULL; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3911 | } |
| 3912 | |
| 3913 | bs = bdrv_lookup_bs(reference, reference, errp); |
| 3914 | if (!bs) { |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3915 | return NULL; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3916 | } |
Kevin Wolf | 76b2232 | 2016-04-04 17:11:13 +0200 | [diff] [blame] | 3917 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3918 | bdrv_ref(bs); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3919 | return bs; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 3920 | } |
| 3921 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 3922 | bs = bdrv_new(); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3923 | |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 3924 | /* NULL means an empty set of options */ |
| 3925 | if (options == NULL) { |
| 3926 | options = qdict_new(); |
| 3927 | } |
| 3928 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 3929 | /* json: syntax counts as explicit options, as if in the QDict */ |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 3930 | parse_json_protocol(options, &filename, &local_err); |
| 3931 | if (local_err) { |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 3932 | goto fail; |
| 3933 | } |
| 3934 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 3935 | bs->explicit_options = qdict_clone_shallow(options); |
| 3936 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3937 | if (child_class) { |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 3938 | bool parent_is_format; |
| 3939 | |
| 3940 | if (parent->drv) { |
| 3941 | parent_is_format = parent->drv->is_format; |
| 3942 | } else { |
| 3943 | /* |
| 3944 | * parent->drv is not set yet because this node is opened for |
| 3945 | * (potential) format probing. That means that @parent is going |
| 3946 | * to be a format node. |
| 3947 | */ |
| 3948 | parent_is_format = true; |
| 3949 | } |
| 3950 | |
Kevin Wolf | bddcec3 | 2015-04-09 18:47:50 +0200 | [diff] [blame] | 3951 | bs->inherits_from = parent; |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 3952 | child_class->inherit_options(child_role, parent_is_format, |
| 3953 | &flags, options, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 3954 | parent->open_flags, parent->options); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 3955 | } |
| 3956 | |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 3957 | ret = bdrv_fill_options(&options, filename, &flags, &local_err); |
Philippe Mathieu-Daudé | dfde483 | 2020-04-22 15:31:44 +0200 | [diff] [blame] | 3958 | if (ret < 0) { |
Kevin Wolf | 462f5bc | 2014-05-26 11:39:55 +0200 | [diff] [blame] | 3959 | goto fail; |
| 3960 | } |
| 3961 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 3962 | /* |
| 3963 | * Set the BDRV_O_RDWR and BDRV_O_ALLOW_RDWR flags. |
| 3964 | * Caution: getting a boolean member of @options requires care. |
| 3965 | * When @options come from -blockdev or blockdev_add, members are |
| 3966 | * typed according to the QAPI schema, but when they come from |
| 3967 | * -drive, they're all QString. |
| 3968 | */ |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 3969 | if (g_strcmp0(qdict_get_try_str(options, BDRV_OPT_READ_ONLY), "on") && |
| 3970 | !qdict_get_try_bool(options, BDRV_OPT_READ_ONLY, false)) { |
| 3971 | flags |= (BDRV_O_RDWR | BDRV_O_ALLOW_RDWR); |
| 3972 | } else { |
| 3973 | flags &= ~BDRV_O_RDWR; |
Alberto Garcia | 14499ea | 2016-09-15 17:53:00 +0300 | [diff] [blame] | 3974 | } |
| 3975 | |
| 3976 | if (flags & BDRV_O_SNAPSHOT) { |
| 3977 | snapshot_options = qdict_new(); |
| 3978 | bdrv_temp_snapshot_options(&snapshot_flags, snapshot_options, |
| 3979 | flags, options); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 3980 | /* Let bdrv_backing_options() override "read-only" */ |
| 3981 | qdict_del(options, BDRV_OPT_READ_ONLY); |
Max Reitz | 00ff7ff | 2020-05-13 13:05:21 +0200 | [diff] [blame] | 3982 | bdrv_inherited_options(BDRV_CHILD_COW, true, |
| 3983 | &flags, options, flags, options); |
Alberto Garcia | 14499ea | 2016-09-15 17:53:00 +0300 | [diff] [blame] | 3984 | } |
| 3985 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 3986 | bs->open_flags = flags; |
| 3987 | bs->options = options; |
| 3988 | options = qdict_clone_shallow(options); |
| 3989 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 3990 | /* Find the right image format driver */ |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 3991 | /* See cautionary note on accessing @options above */ |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 3992 | drvname = qdict_get_try_str(options, "driver"); |
| 3993 | if (drvname) { |
| 3994 | drv = bdrv_find_format(drvname); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 3995 | if (!drv) { |
| 3996 | error_setg(errp, "Unknown driver: '%s'", drvname); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 3997 | goto fail; |
| 3998 | } |
| 3999 | } |
| 4000 | |
| 4001 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4002 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 4003 | /* See cautionary note on accessing @options above */ |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 4004 | backing = qdict_get_try_str(options, "backing"); |
Max Reitz | e59a0cf | 2018-02-24 16:40:32 +0100 | [diff] [blame] | 4005 | if (qobject_to(QNull, qdict_get(options, "backing")) != NULL || |
| 4006 | (backing && *backing == '\0')) |
| 4007 | { |
Max Reitz | 4f7be28 | 2018-02-24 16:40:33 +0100 | [diff] [blame] | 4008 | if (backing) { |
| 4009 | warn_report("Use of \"backing\": \"\" is deprecated; " |
| 4010 | "use \"backing\": null instead"); |
| 4011 | } |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 4012 | flags |= BDRV_O_NO_BACKING; |
Kevin Wolf | ae0f57f | 2019-11-08 09:36:35 +0100 | [diff] [blame] | 4013 | qdict_del(bs->explicit_options, "backing"); |
| 4014 | qdict_del(bs->options, "backing"); |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 4015 | qdict_del(options, "backing"); |
| 4016 | } |
| 4017 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4018 | /* Open image file without format layer. This BlockBackend is only used for |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 4019 | * probing, the block drivers will do their own bdrv_open_child() for the |
| 4020 | * 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] | 4021 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4022 | BlockDriverState *file_bs; |
| 4023 | |
| 4024 | file_bs = bdrv_open_child_bs(filename, options, "file", bs, |
Max Reitz | 5894440 | 2020-05-13 13:05:37 +0200 | [diff] [blame] | 4025 | &child_of_bds, BDRV_CHILD_IMAGE, |
| 4026 | true, &local_err); |
Kevin Wolf | 1fdd693 | 2015-06-15 14:11:51 +0200 | [diff] [blame] | 4027 | if (local_err) { |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 4028 | goto fail; |
| 4029 | } |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4030 | if (file_bs != NULL) { |
Kevin Wolf | dacaa16 | 2017-11-20 14:59:13 +0100 | [diff] [blame] | 4031 | /* Not requesting BLK_PERM_CONSISTENT_READ because we're only |
| 4032 | * looking at the header to guess the image format. This works even |
| 4033 | * in cases where a guest would not see a consistent state. */ |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4034 | ctx = bdrv_get_aio_context(file_bs); |
| 4035 | aio_context_acquire(ctx); |
| 4036 | file = blk_new(ctx, 0, BLK_PERM_ALL); |
Kevin Wolf | d708642 | 2017-01-13 19:02:32 +0100 | [diff] [blame] | 4037 | blk_insert_bs(file, file_bs, &local_err); |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4038 | bdrv_unref(file_bs); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4039 | aio_context_release(ctx); |
| 4040 | |
Kevin Wolf | d708642 | 2017-01-13 19:02:32 +0100 | [diff] [blame] | 4041 | if (local_err) { |
| 4042 | goto fail; |
| 4043 | } |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4044 | |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 4045 | qdict_put_str(options, "file", bdrv_get_node_name(file_bs)); |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 4046 | } |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 4047 | } |
| 4048 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4049 | /* Image format probing */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 4050 | bs->probed = !drv; |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4051 | if (!drv && file) { |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 4052 | ret = find_image_format(file, filename, &drv, &local_err); |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 4053 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 4054 | goto fail; |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 4055 | } |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 4056 | /* |
| 4057 | * This option update would logically belong in bdrv_fill_options(), |
| 4058 | * but we first need to open bs->file for the probing to work, while |
| 4059 | * opening bs->file already requires the (mostly) final set of options |
| 4060 | * so that cache mode etc. can be inherited. |
| 4061 | * |
| 4062 | * Adding the driver later is somewhat ugly, but it's not an option |
| 4063 | * that would ever be inherited, so it's correct. We just need to make |
| 4064 | * sure to update both bs->options (which has the full effective |
| 4065 | * options for bs) and options (which has file.* already removed). |
| 4066 | */ |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 4067 | qdict_put_str(bs->options, "driver", drv->format_name); |
| 4068 | qdict_put_str(options, "driver", drv->format_name); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 4069 | } else if (!drv) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 4070 | error_setg(errp, "Must specify either driver or file"); |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 4071 | goto fail; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 4072 | } |
| 4073 | |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 4074 | /* BDRV_O_PROTOCOL must be set iff a protocol BDS is about to be created */ |
| 4075 | assert(!!(flags & BDRV_O_PROTOCOL) == !!drv->bdrv_file_open); |
| 4076 | /* file must be NULL if a protocol BDS is about to be created |
| 4077 | * (the inverse results in an error message from bdrv_open_common()) */ |
| 4078 | assert(!(flags & BDRV_O_PROTOCOL) || !file); |
| 4079 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4080 | /* Open the image */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 4081 | ret = bdrv_open_common(bs, file, options, &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4082 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 4083 | goto fail; |
Christoph Hellwig | 6987307 | 2010-01-20 18:13:25 +0100 | [diff] [blame] | 4084 | } |
| 4085 | |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4086 | /* The AioContext could have changed during bdrv_open_common() */ |
| 4087 | ctx = bdrv_get_aio_context(bs); |
| 4088 | |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 4089 | if (file) { |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4090 | aio_context_acquire(ctx); |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4091 | blk_unref(file); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4092 | aio_context_release(ctx); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 4093 | file = NULL; |
| 4094 | } |
| 4095 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4096 | /* If there is a backing file, use it */ |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 4097 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 4098 | ret = bdrv_open_backing_file(bs, options, "backing", &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4099 | if (ret < 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4100 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4101 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4102 | } |
| 4103 | |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 4104 | /* Remove all children options and references |
| 4105 | * from bs->options and bs->explicit_options */ |
Alberto Garcia | 2f624b8 | 2018-06-29 14:37:00 +0300 | [diff] [blame] | 4106 | QLIST_FOREACH(child, &bs->children, next) { |
| 4107 | char *child_key_dot; |
| 4108 | child_key_dot = g_strdup_printf("%s.", child->name); |
| 4109 | qdict_extract_subqdict(bs->explicit_options, NULL, child_key_dot); |
| 4110 | qdict_extract_subqdict(bs->options, NULL, child_key_dot); |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 4111 | qdict_del(bs->explicit_options, child->name); |
| 4112 | qdict_del(bs->options, child->name); |
Alberto Garcia | 2f624b8 | 2018-06-29 14:37:00 +0300 | [diff] [blame] | 4113 | g_free(child_key_dot); |
| 4114 | } |
| 4115 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4116 | /* Check if any unknown options were used */ |
Paolo Bonzini | 7ad2757 | 2017-01-04 15:59:14 +0100 | [diff] [blame] | 4117 | if (qdict_size(options) != 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4118 | const QDictEntry *entry = qdict_first(options); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 4119 | if (flags & BDRV_O_PROTOCOL) { |
| 4120 | error_setg(errp, "Block protocol '%s' doesn't support the option " |
| 4121 | "'%s'", drv->format_name, entry->key); |
| 4122 | } else { |
Max Reitz | d0e46a5 | 2016-03-16 19:54:34 +0100 | [diff] [blame] | 4123 | error_setg(errp, |
| 4124 | "Block format '%s' does not support the option '%s'", |
| 4125 | drv->format_name, entry->key); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 4126 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4127 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4128 | goto close_and_fail; |
| 4129 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4130 | |
Daniel P. Berrange | c01c214 | 2017-06-23 17:24:16 +0100 | [diff] [blame] | 4131 | bdrv_parent_cb_change_media(bs, true); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4132 | |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 4133 | qobject_unref(options); |
Alberto Garcia | 8961be3 | 2018-09-06 17:25:41 +0300 | [diff] [blame] | 4134 | options = NULL; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 4135 | |
| 4136 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
| 4137 | * temporary snapshot afterwards. */ |
| 4138 | if (snapshot_flags) { |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 4139 | BlockDriverState *snapshot_bs; |
| 4140 | snapshot_bs = bdrv_append_temp_snapshot(bs, snapshot_flags, |
| 4141 | snapshot_options, &local_err); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 4142 | snapshot_options = NULL; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 4143 | if (local_err) { |
| 4144 | goto close_and_fail; |
| 4145 | } |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4146 | /* We are not going to return bs but the overlay on top of it |
| 4147 | * (snapshot_bs); thus, we have to drop the strong reference to bs |
| 4148 | * (which we obtained by calling bdrv_new()). bs will not be deleted, |
| 4149 | * though, because the overlay still has a reference to it. */ |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4150 | aio_context_acquire(ctx); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4151 | bdrv_unref(bs); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4152 | aio_context_release(ctx); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4153 | bs = snapshot_bs; |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 4154 | } |
| 4155 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4156 | return bs; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4157 | |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 4158 | fail: |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4159 | aio_context_acquire(ctx); |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 4160 | blk_unref(file); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 4161 | qobject_unref(snapshot_options); |
| 4162 | qobject_unref(bs->explicit_options); |
| 4163 | qobject_unref(bs->options); |
| 4164 | qobject_unref(options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 4165 | bs->options = NULL; |
Manos Pitsidianakis | 998cbd6 | 2017-07-14 17:35:47 +0300 | [diff] [blame] | 4166 | bs->explicit_options = NULL; |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4167 | bdrv_unref(bs); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4168 | aio_context_release(ctx); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 4169 | error_propagate(errp, local_err); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4170 | return NULL; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 4171 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 4172 | close_and_fail: |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4173 | aio_context_acquire(ctx); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4174 | bdrv_unref(bs); |
Kevin Wolf | f665f01 | 2023-06-05 10:57:07 +0200 | [diff] [blame] | 4175 | aio_context_release(ctx); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 4176 | qobject_unref(snapshot_options); |
| 4177 | qobject_unref(options); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 4178 | error_propagate(errp, local_err); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4179 | return NULL; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 4180 | } |
| 4181 | |
Kevin Wolf | ae400db | 2023-05-25 14:47:03 +0200 | [diff] [blame] | 4182 | /* The caller must always hold the main AioContext lock. */ |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4183 | BlockDriverState *bdrv_open(const char *filename, const char *reference, |
| 4184 | QDict *options, int flags, Error **errp) |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 4185 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4186 | GLOBAL_STATE_CODE(); |
| 4187 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 4188 | return bdrv_open_inherit(filename, reference, options, flags, NULL, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 4189 | NULL, 0, errp); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 4190 | } |
| 4191 | |
Alberto Garcia | faf116b | 2019-03-12 18:48:49 +0200 | [diff] [blame] | 4192 | /* Return true if the NULL-terminated @list contains @str */ |
| 4193 | static bool is_str_in_list(const char *str, const char *const *list) |
| 4194 | { |
| 4195 | if (str && list) { |
| 4196 | int i; |
| 4197 | for (i = 0; list[i] != NULL; i++) { |
| 4198 | if (!strcmp(str, list[i])) { |
| 4199 | return true; |
| 4200 | } |
| 4201 | } |
| 4202 | } |
| 4203 | return false; |
| 4204 | } |
| 4205 | |
| 4206 | /* |
| 4207 | * Check that every option set in @bs->options is also set in |
| 4208 | * @new_opts. |
| 4209 | * |
| 4210 | * Options listed in the common_options list and in |
| 4211 | * @bs->drv->mutable_opts are skipped. |
| 4212 | * |
| 4213 | * Return 0 on success, otherwise return -EINVAL and set @errp. |
| 4214 | */ |
| 4215 | static int bdrv_reset_options_allowed(BlockDriverState *bs, |
| 4216 | const QDict *new_opts, Error **errp) |
| 4217 | { |
| 4218 | const QDictEntry *e; |
| 4219 | /* These options are common to all block drivers and are handled |
| 4220 | * in bdrv_reopen_prepare() so they can be left out of @new_opts */ |
| 4221 | const char *const common_options[] = { |
| 4222 | "node-name", "discard", "cache.direct", "cache.no-flush", |
| 4223 | "read-only", "auto-read-only", "detect-zeroes", NULL |
| 4224 | }; |
| 4225 | |
| 4226 | for (e = qdict_first(bs->options); e; e = qdict_next(bs->options, e)) { |
| 4227 | if (!qdict_haskey(new_opts, e->key) && |
| 4228 | !is_str_in_list(e->key, common_options) && |
| 4229 | !is_str_in_list(e->key, bs->drv->mutable_opts)) { |
| 4230 | error_setg(errp, "Option '%s' cannot be reset " |
| 4231 | "to its default value", e->key); |
| 4232 | return -EINVAL; |
| 4233 | } |
| 4234 | } |
| 4235 | |
| 4236 | return 0; |
| 4237 | } |
| 4238 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4239 | /* |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4240 | * Returns true if @child can be reached recursively from @bs |
| 4241 | */ |
| 4242 | static bool bdrv_recurse_has_child(BlockDriverState *bs, |
| 4243 | BlockDriverState *child) |
| 4244 | { |
| 4245 | BdrvChild *c; |
| 4246 | |
| 4247 | if (bs == child) { |
| 4248 | return true; |
| 4249 | } |
| 4250 | |
| 4251 | QLIST_FOREACH(c, &bs->children, next) { |
| 4252 | if (bdrv_recurse_has_child(c->bs, child)) { |
| 4253 | return true; |
| 4254 | } |
| 4255 | } |
| 4256 | |
| 4257 | return false; |
| 4258 | } |
| 4259 | |
| 4260 | /* |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4261 | * Adds a BlockDriverState to a simple queue for an atomic, transactional |
| 4262 | * reopen of multiple devices. |
| 4263 | * |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4264 | * 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] | 4265 | * already performed, or alternatively may be NULL a new BlockReopenQueue will |
| 4266 | * be created and initialized. This newly created BlockReopenQueue should be |
| 4267 | * passed back in for subsequent calls that are intended to be of the same |
| 4268 | * atomic 'set'. |
| 4269 | * |
| 4270 | * bs is the BlockDriverState to add to the reopen queue. |
| 4271 | * |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4272 | * options contains the changed options for the associated bs |
| 4273 | * (the BlockReopenQueue takes ownership) |
| 4274 | * |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4275 | * flags contains the open flags for the associated bs |
| 4276 | * |
| 4277 | * returns a pointer to bs_queue, which is either the newly allocated |
| 4278 | * bs_queue, or the existing bs_queue being used. |
| 4279 | * |
Kevin Wolf | d22933a | 2022-11-18 18:41:02 +0100 | [diff] [blame] | 4280 | * bs is drained here and undrained by bdrv_reopen_queue_free(). |
Kevin Wolf | 2e11786 | 2022-11-18 18:41:01 +0100 | [diff] [blame] | 4281 | * |
| 4282 | * To be called with bs->aio_context locked. |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4283 | */ |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4284 | static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue, |
| 4285 | BlockDriverState *bs, |
| 4286 | QDict *options, |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 4287 | const BdrvChildClass *klass, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 4288 | BdrvChildRole role, |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4289 | bool parent_is_format, |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4290 | QDict *parent_options, |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 4291 | int parent_flags, |
| 4292 | bool keep_old_opts) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4293 | { |
| 4294 | assert(bs != NULL); |
| 4295 | |
| 4296 | BlockReopenQueueEntry *bs_entry; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4297 | BdrvChild *child; |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4298 | QDict *old_options, *explicit_options, *options_copy; |
| 4299 | int flags; |
| 4300 | QemuOpts *opts; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4301 | |
Emanuele Giuseppe Esposito | f0c2832 | 2022-03-03 10:16:13 -0500 | [diff] [blame] | 4302 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 4303 | |
Kevin Wolf | d22933a | 2022-11-18 18:41:02 +0100 | [diff] [blame] | 4304 | bdrv_drained_begin(bs); |
| 4305 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4306 | if (bs_queue == NULL) { |
| 4307 | bs_queue = g_new0(BlockReopenQueue, 1); |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4308 | QTAILQ_INIT(bs_queue); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4309 | } |
| 4310 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4311 | if (!options) { |
| 4312 | options = qdict_new(); |
| 4313 | } |
| 4314 | |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 4315 | /* Check if this BlockDriverState is already in the queue */ |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4316 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 4317 | if (bs == bs_entry->state.bs) { |
| 4318 | break; |
| 4319 | } |
| 4320 | } |
| 4321 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4322 | /* |
| 4323 | * Precedence of options: |
| 4324 | * 1. Explicitly passed in options (highest) |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4325 | * 2. Retained from explicitly set options of bs |
| 4326 | * 3. Inherited from parent node |
| 4327 | * 4. Retained from effective options of bs |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4328 | */ |
| 4329 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 4330 | /* Old explicitly set values (don't overwrite by inherited value) */ |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 4331 | if (bs_entry || keep_old_opts) { |
| 4332 | old_options = qdict_clone_shallow(bs_entry ? |
| 4333 | bs_entry->state.explicit_options : |
| 4334 | bs->explicit_options); |
| 4335 | bdrv_join_options(bs, options, old_options); |
| 4336 | qobject_unref(old_options); |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 4337 | } |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 4338 | |
| 4339 | explicit_options = qdict_clone_shallow(options); |
| 4340 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4341 | /* Inherit from parent node */ |
| 4342 | if (parent_options) { |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4343 | flags = 0; |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4344 | klass->inherit_options(role, parent_is_format, &flags, options, |
Max Reitz | 272c02e | 2020-05-13 13:05:17 +0200 | [diff] [blame] | 4345 | parent_flags, parent_options); |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4346 | } else { |
| 4347 | flags = bdrv_get_flags(bs); |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4348 | } |
| 4349 | |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 4350 | if (keep_old_opts) { |
| 4351 | /* Old values are used for options that aren't set yet */ |
| 4352 | old_options = qdict_clone_shallow(bs->options); |
| 4353 | bdrv_join_options(bs, options, old_options); |
| 4354 | qobject_unref(old_options); |
| 4355 | } |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4356 | |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4357 | /* We have the final set of options so let's update the flags */ |
| 4358 | options_copy = qdict_clone_shallow(options); |
| 4359 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
| 4360 | qemu_opts_absorb_qdict(opts, options_copy, NULL); |
| 4361 | update_flags_from_options(&flags, opts); |
| 4362 | qemu_opts_del(opts); |
| 4363 | qobject_unref(options_copy); |
| 4364 | |
Kevin Wolf | fd45202 | 2017-08-03 17:02:59 +0200 | [diff] [blame] | 4365 | /* bdrv_open_inherit() sets and clears some additional flags internally */ |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 4366 | flags &= ~BDRV_O_PROTOCOL; |
Kevin Wolf | fd45202 | 2017-08-03 17:02:59 +0200 | [diff] [blame] | 4367 | if (flags & BDRV_O_RDWR) { |
| 4368 | flags |= BDRV_O_ALLOW_RDWR; |
| 4369 | } |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 4370 | |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 4371 | if (!bs_entry) { |
| 4372 | bs_entry = g_new0(BlockReopenQueueEntry, 1); |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4373 | QTAILQ_INSERT_TAIL(bs_queue, bs_entry, entry); |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 4374 | } else { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 4375 | qobject_unref(bs_entry->state.options); |
| 4376 | qobject_unref(bs_entry->state.explicit_options); |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 4377 | } |
| 4378 | |
| 4379 | bs_entry->state.bs = bs; |
| 4380 | bs_entry->state.options = options; |
| 4381 | bs_entry->state.explicit_options = explicit_options; |
| 4382 | bs_entry->state.flags = flags; |
| 4383 | |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4384 | /* |
| 4385 | * If keep_old_opts is false then it means that unspecified |
| 4386 | * options must be reset to their original value. We don't allow |
| 4387 | * resetting 'backing' but we need to know if the option is |
| 4388 | * missing in order to decide if we have to return an error. |
| 4389 | */ |
| 4390 | if (!keep_old_opts) { |
| 4391 | bs_entry->state.backing_missing = |
| 4392 | !qdict_haskey(options, "backing") && |
| 4393 | !qdict_haskey(options, "backing.driver"); |
| 4394 | } |
| 4395 | |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4396 | QLIST_FOREACH(child, &bs->children, next) { |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4397 | QDict *new_child_options = NULL; |
| 4398 | bool child_keep_old = keep_old_opts; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4399 | |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 4400 | /* reopen can only change the options of block devices that were |
| 4401 | * implicitly created and inherited options. For other (referenced) |
| 4402 | * block devices, a syntax like "backing.foo" results in an error. */ |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 4403 | if (child->bs->inherits_from != bs) { |
| 4404 | continue; |
| 4405 | } |
| 4406 | |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4407 | /* Check if the options contain a child reference */ |
| 4408 | if (qdict_haskey(options, child->name)) { |
| 4409 | const char *childref = qdict_get_try_str(options, child->name); |
| 4410 | /* |
| 4411 | * The current child must not be reopened if the child |
| 4412 | * reference is null or points to a different node. |
| 4413 | */ |
| 4414 | if (g_strcmp0(childref, child->bs->node_name)) { |
| 4415 | continue; |
| 4416 | } |
| 4417 | /* |
| 4418 | * If the child reference points to the current child then |
| 4419 | * reopen it with its existing set of options (note that |
| 4420 | * it can still inherit new options from the parent). |
| 4421 | */ |
| 4422 | child_keep_old = true; |
| 4423 | } else { |
| 4424 | /* Extract child options ("child-name.*") */ |
| 4425 | char *child_key_dot = g_strdup_printf("%s.", child->name); |
| 4426 | qdict_extract_subqdict(explicit_options, NULL, child_key_dot); |
| 4427 | qdict_extract_subqdict(options, &new_child_options, child_key_dot); |
| 4428 | g_free(child_key_dot); |
| 4429 | } |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 4430 | |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 4431 | bdrv_reopen_queue_child(bs_queue, child->bs, new_child_options, |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4432 | child->klass, child->role, bs->drv->is_format, |
| 4433 | options, flags, child_keep_old); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4434 | } |
| 4435 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4436 | return bs_queue; |
| 4437 | } |
| 4438 | |
Kevin Wolf | 2e11786 | 2022-11-18 18:41:01 +0100 | [diff] [blame] | 4439 | /* To be called with bs->aio_context locked */ |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4440 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
| 4441 | BlockDriverState *bs, |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 4442 | QDict *options, bool keep_old_opts) |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4443 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4444 | GLOBAL_STATE_CODE(); |
| 4445 | |
Max Reitz | 3cdc69d | 2020-05-13 13:05:18 +0200 | [diff] [blame] | 4446 | return bdrv_reopen_queue_child(bs_queue, bs, options, NULL, 0, false, |
| 4447 | NULL, 0, keep_old_opts); |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 4448 | } |
| 4449 | |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 4450 | void bdrv_reopen_queue_free(BlockReopenQueue *bs_queue) |
| 4451 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4452 | GLOBAL_STATE_CODE(); |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 4453 | if (bs_queue) { |
| 4454 | BlockReopenQueueEntry *bs_entry, *next; |
| 4455 | QTAILQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
Kevin Wolf | d22933a | 2022-11-18 18:41:02 +0100 | [diff] [blame] | 4456 | AioContext *ctx = bdrv_get_aio_context(bs_entry->state.bs); |
| 4457 | |
| 4458 | aio_context_acquire(ctx); |
| 4459 | bdrv_drained_end(bs_entry->state.bs); |
| 4460 | aio_context_release(ctx); |
| 4461 | |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 4462 | qobject_unref(bs_entry->state.explicit_options); |
| 4463 | qobject_unref(bs_entry->state.options); |
| 4464 | g_free(bs_entry); |
| 4465 | } |
| 4466 | g_free(bs_queue); |
| 4467 | } |
| 4468 | } |
| 4469 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4470 | /* |
| 4471 | * Reopen multiple BlockDriverStates atomically & transactionally. |
| 4472 | * |
| 4473 | * The queue passed in (bs_queue) must have been built up previous |
| 4474 | * via bdrv_reopen_queue(). |
| 4475 | * |
| 4476 | * Reopens all BDS specified in the queue, with the appropriate |
| 4477 | * flags. All devices are prepared for reopen, and failure of any |
Stefan Weil | 50d6a8a | 2018-07-12 21:51:20 +0200 | [diff] [blame] | 4478 | * device will cause all device changes to be abandoned, and intermediate |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4479 | * data cleaned up. |
| 4480 | * |
| 4481 | * If all devices prepare successfully, then the changes are committed |
| 4482 | * to all devices. |
| 4483 | * |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 4484 | * All affected nodes must be drained between bdrv_reopen_queue() and |
| 4485 | * bdrv_reopen_multiple(). |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4486 | * |
| 4487 | * To be called from the main thread, with all other AioContexts unlocked. |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4488 | */ |
Alberto Garcia | 5019aec | 2019-03-12 18:48:50 +0200 | [diff] [blame] | 4489 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4490 | { |
| 4491 | int ret = -1; |
| 4492 | BlockReopenQueueEntry *bs_entry, *next; |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4493 | AioContext *ctx; |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4494 | Transaction *tran = tran_new(); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4495 | g_autoptr(GSList) refresh_list = NULL; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4496 | |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4497 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4498 | assert(bs_queue != NULL); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 4499 | GLOBAL_STATE_CODE(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4500 | |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4501 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4502 | ctx = bdrv_get_aio_context(bs_entry->state.bs); |
| 4503 | aio_context_acquire(ctx); |
Vladimir Sementsov-Ogievskiy | a2aabf8 | 2021-04-28 18:17:57 +0300 | [diff] [blame] | 4504 | ret = bdrv_flush(bs_entry->state.bs); |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4505 | aio_context_release(ctx); |
Vladimir Sementsov-Ogievskiy | a2aabf8 | 2021-04-28 18:17:57 +0300 | [diff] [blame] | 4506 | if (ret < 0) { |
| 4507 | error_setg_errno(errp, -ret, "Error flushing drive"); |
Kevin Wolf | e3fc91a | 2021-05-03 13:05:55 +0200 | [diff] [blame] | 4508 | goto abort; |
Vladimir Sementsov-Ogievskiy | a2aabf8 | 2021-04-28 18:17:57 +0300 | [diff] [blame] | 4509 | } |
| 4510 | } |
| 4511 | |
| 4512 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 4513 | assert(bs_entry->state.bs->quiesce_counter > 0); |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4514 | ctx = bdrv_get_aio_context(bs_entry->state.bs); |
| 4515 | aio_context_acquire(ctx); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4516 | ret = bdrv_reopen_prepare(&bs_entry->state, bs_queue, tran, errp); |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4517 | aio_context_release(ctx); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4518 | if (ret < 0) { |
| 4519 | goto abort; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4520 | } |
| 4521 | bs_entry->prepared = true; |
| 4522 | } |
| 4523 | |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4524 | QTAILQ_FOREACH(bs_entry, bs_queue, entry) { |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4525 | BDRVReopenState *state = &bs_entry->state; |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4526 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 4527 | refresh_list = g_slist_prepend(refresh_list, state->bs); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4528 | if (state->old_backing_bs) { |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 4529 | refresh_list = g_slist_prepend(refresh_list, state->old_backing_bs); |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4530 | } |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4531 | if (state->old_file_bs) { |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 4532 | refresh_list = g_slist_prepend(refresh_list, state->old_file_bs); |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4533 | } |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4534 | } |
| 4535 | |
| 4536 | /* |
| 4537 | * Note that file-posix driver rely on permission update done during reopen |
| 4538 | * (even if no permission changed), because it wants "new" permissions for |
| 4539 | * reconfiguring the fd and that's why it does it in raw_check_perm(), not |
| 4540 | * in raw_reopen_prepare() which is called with "old" permissions. |
| 4541 | */ |
| 4542 | ret = bdrv_list_refresh_perms(refresh_list, bs_queue, tran, errp); |
| 4543 | if (ret < 0) { |
| 4544 | goto abort; |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4545 | } |
| 4546 | |
Vladimir Sementsov-Ogievskiy | fcd6a4f | 2019-09-27 15:23:48 +0300 | [diff] [blame] | 4547 | /* |
| 4548 | * If we reach this point, we have success and just need to apply the |
| 4549 | * changes. |
| 4550 | * |
| 4551 | * Reverse order is used to comfort qcow2 driver: on commit it need to write |
| 4552 | * IN_USE flag to the image, to mark bitmaps in the image as invalid. But |
| 4553 | * children are usually goes after parents in reopen-queue, so go from last |
| 4554 | * to first element. |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4555 | */ |
Vladimir Sementsov-Ogievskiy | fcd6a4f | 2019-09-27 15:23:48 +0300 | [diff] [blame] | 4556 | QTAILQ_FOREACH_REVERSE(bs_entry, bs_queue, entry) { |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4557 | ctx = bdrv_get_aio_context(bs_entry->state.bs); |
| 4558 | aio_context_acquire(ctx); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4559 | bdrv_reopen_commit(&bs_entry->state); |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4560 | aio_context_release(ctx); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4561 | } |
| 4562 | |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4563 | tran_commit(tran); |
| 4564 | |
| 4565 | QTAILQ_FOREACH_REVERSE(bs_entry, bs_queue, entry) { |
| 4566 | BlockDriverState *bs = bs_entry->state.bs; |
| 4567 | |
| 4568 | if (bs->drv->bdrv_reopen_commit_post) { |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4569 | ctx = bdrv_get_aio_context(bs); |
| 4570 | aio_context_acquire(ctx); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4571 | bs->drv->bdrv_reopen_commit_post(&bs_entry->state); |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4572 | aio_context_release(ctx); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4573 | } |
| 4574 | } |
| 4575 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4576 | ret = 0; |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4577 | goto cleanup; |
| 4578 | |
| 4579 | abort: |
| 4580 | tran_abort(tran); |
Vladimir Sementsov-Ogievskiy | 859443b | 2019-09-27 15:23:47 +0300 | [diff] [blame] | 4581 | QTAILQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4582 | if (bs_entry->prepared) { |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4583 | ctx = bdrv_get_aio_context(bs_entry->state.bs); |
| 4584 | aio_context_acquire(ctx); |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4585 | bdrv_reopen_abort(&bs_entry->state); |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4586 | aio_context_release(ctx); |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4587 | } |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 4588 | } |
Peter Krempa | 17e1e2b | 2020-02-28 13:44:46 +0100 | [diff] [blame] | 4589 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4590 | cleanup: |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 4591 | bdrv_reopen_queue_free(bs_queue); |
Alberto Garcia | 40840e4 | 2016-10-28 10:08:03 +0300 | [diff] [blame] | 4592 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4593 | return ret; |
| 4594 | } |
| 4595 | |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4596 | int bdrv_reopen(BlockDriverState *bs, QDict *opts, bool keep_old_opts, |
| 4597 | Error **errp) |
| 4598 | { |
| 4599 | AioContext *ctx = bdrv_get_aio_context(bs); |
| 4600 | BlockReopenQueue *queue; |
| 4601 | int ret; |
| 4602 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4603 | GLOBAL_STATE_CODE(); |
| 4604 | |
Kevin Wolf | 2e11786 | 2022-11-18 18:41:01 +0100 | [diff] [blame] | 4605 | queue = bdrv_reopen_queue(NULL, bs, opts, keep_old_opts); |
| 4606 | |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4607 | if (ctx != qemu_get_aio_context()) { |
| 4608 | aio_context_release(ctx); |
| 4609 | } |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4610 | ret = bdrv_reopen_multiple(queue, errp); |
| 4611 | |
| 4612 | if (ctx != qemu_get_aio_context()) { |
| 4613 | aio_context_acquire(ctx); |
| 4614 | } |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4615 | |
| 4616 | return ret; |
| 4617 | } |
| 4618 | |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 4619 | int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only, |
| 4620 | Error **errp) |
| 4621 | { |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 4622 | QDict *opts = qdict_new(); |
| 4623 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 4624 | GLOBAL_STATE_CODE(); |
| 4625 | |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 4626 | qdict_put_bool(opts, BDRV_OPT_READ_ONLY, read_only); |
| 4627 | |
Kevin Wolf | 6cf42ca | 2021-07-08 13:47:06 +0200 | [diff] [blame] | 4628 | return bdrv_reopen(bs, opts, true, errp); |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 4629 | } |
| 4630 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4631 | /* |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4632 | * Take a BDRVReopenState and check if the value of 'backing' in the |
| 4633 | * reopen_state->options QDict is valid or not. |
| 4634 | * |
| 4635 | * If 'backing' is missing from the QDict then return 0. |
| 4636 | * |
| 4637 | * If 'backing' contains the node name of the backing file of |
| 4638 | * reopen_state->bs then return 0. |
| 4639 | * |
| 4640 | * If 'backing' contains a different node name (or is null) then check |
| 4641 | * whether the current backing file can be replaced with the new one. |
| 4642 | * If that's the case then reopen_state->replace_backing_bs is set to |
| 4643 | * true and reopen_state->new_backing_bs contains a pointer to the new |
| 4644 | * backing BlockDriverState (or NULL). |
| 4645 | * |
| 4646 | * Return 0 on success, otherwise return < 0 and set @errp. |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4647 | * |
| 4648 | * The caller must hold the AioContext lock of @reopen_state->bs. |
| 4649 | * @reopen_state->bs can move to a different AioContext in this function. |
| 4650 | * Callers must make sure that their AioContext locking is still correct after |
| 4651 | * this. |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4652 | */ |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4653 | static int bdrv_reopen_parse_file_or_backing(BDRVReopenState *reopen_state, |
| 4654 | bool is_backing, Transaction *tran, |
| 4655 | Error **errp) |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4656 | { |
| 4657 | BlockDriverState *bs = reopen_state->bs; |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4658 | BlockDriverState *new_child_bs; |
| 4659 | BlockDriverState *old_child_bs = is_backing ? child_bs(bs->backing) : |
| 4660 | child_bs(bs->file); |
| 4661 | const char *child_name = is_backing ? "backing" : "file"; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4662 | QObject *value; |
| 4663 | const char *str; |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4664 | AioContext *ctx, *old_ctx; |
| 4665 | int ret; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4666 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 4667 | GLOBAL_STATE_CODE(); |
| 4668 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4669 | value = qdict_get(reopen_state->options, child_name); |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4670 | if (value == NULL) { |
| 4671 | return 0; |
| 4672 | } |
| 4673 | |
| 4674 | switch (qobject_type(value)) { |
| 4675 | case QTYPE_QNULL: |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4676 | assert(is_backing); /* The 'file' option does not allow a null value */ |
| 4677 | new_child_bs = NULL; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4678 | break; |
| 4679 | case QTYPE_QSTRING: |
Markus Armbruster | 410f44f | 2020-12-11 18:11:42 +0100 | [diff] [blame] | 4680 | str = qstring_get_str(qobject_to(QString, value)); |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4681 | new_child_bs = bdrv_lookup_bs(NULL, str, errp); |
| 4682 | if (new_child_bs == NULL) { |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4683 | return -EINVAL; |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4684 | } else if (bdrv_recurse_has_child(new_child_bs, bs)) { |
| 4685 | error_setg(errp, "Making '%s' a %s child of '%s' would create a " |
| 4686 | "cycle", str, child_name, bs->node_name); |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4687 | return -EINVAL; |
| 4688 | } |
| 4689 | break; |
| 4690 | default: |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4691 | /* |
| 4692 | * The options QDict has been flattened, so 'backing' and 'file' |
| 4693 | * do not allow any other data type here. |
| 4694 | */ |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4695 | g_assert_not_reached(); |
| 4696 | } |
| 4697 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4698 | if (old_child_bs == new_child_bs) { |
| 4699 | return 0; |
| 4700 | } |
| 4701 | |
| 4702 | if (old_child_bs) { |
| 4703 | if (bdrv_skip_implicit_filters(old_child_bs) == new_child_bs) { |
Vladimir Sementsov-Ogievskiy | cbfdb98 | 2021-06-10 15:05:33 +0300 | [diff] [blame] | 4704 | return 0; |
| 4705 | } |
| 4706 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4707 | if (old_child_bs->implicit) { |
| 4708 | error_setg(errp, "Cannot replace implicit %s child of %s", |
| 4709 | child_name, bs->node_name); |
Vladimir Sementsov-Ogievskiy | cbfdb98 | 2021-06-10 15:05:33 +0300 | [diff] [blame] | 4710 | return -EPERM; |
| 4711 | } |
| 4712 | } |
| 4713 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4714 | if (bs->drv->is_filter && !old_child_bs) { |
Vladimir Sementsov-Ogievskiy | 25f78d9 | 2021-06-10 15:05:34 +0300 | [diff] [blame] | 4715 | /* |
| 4716 | * Filters always have a file or a backing child, so we are trying to |
| 4717 | * change wrong child |
| 4718 | */ |
| 4719 | 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] | 4720 | "%s child", bs->node_name, bs->drv->format_name, child_name); |
Max Reitz | 1d42f48 | 2019-06-12 17:24:39 +0200 | [diff] [blame] | 4721 | return -EINVAL; |
| 4722 | } |
| 4723 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4724 | if (is_backing) { |
| 4725 | reopen_state->old_backing_bs = old_child_bs; |
| 4726 | } else { |
| 4727 | reopen_state->old_file_bs = old_child_bs; |
| 4728 | } |
| 4729 | |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4730 | old_ctx = bdrv_get_aio_context(bs); |
| 4731 | ctx = bdrv_get_aio_context(new_child_bs); |
| 4732 | if (old_ctx != ctx) { |
| 4733 | aio_context_release(old_ctx); |
| 4734 | aio_context_acquire(ctx); |
| 4735 | } |
| 4736 | |
| 4737 | ret = bdrv_set_file_or_backing_noperm(bs, new_child_bs, is_backing, |
| 4738 | tran, errp); |
| 4739 | |
| 4740 | if (old_ctx != ctx) { |
| 4741 | aio_context_release(ctx); |
| 4742 | aio_context_acquire(old_ctx); |
| 4743 | } |
| 4744 | |
| 4745 | return ret; |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4746 | } |
| 4747 | |
| 4748 | /* |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4749 | * Prepares a BlockDriverState for reopen. All changes are staged in the |
| 4750 | * 'opaque' field of the BDRVReopenState, which is used and allocated by |
| 4751 | * the block driver layer .bdrv_reopen_prepare() |
| 4752 | * |
| 4753 | * bs is the BlockDriverState to reopen |
| 4754 | * flags are the new open flags |
| 4755 | * queue is the reopen queue |
| 4756 | * |
| 4757 | * Returns 0 on success, non-zero on error. On error errp will be set |
| 4758 | * as well. |
| 4759 | * |
| 4760 | * On failure, bdrv_reopen_abort() will be called to clean up any data. |
| 4761 | * It is the responsibility of the caller to then call the abort() or |
| 4762 | * commit() for any other BDS that have been left in a prepare() state |
| 4763 | * |
Kevin Wolf | 4b40866 | 2023-06-05 10:57:06 +0200 | [diff] [blame] | 4764 | * The caller must hold the AioContext lock of @reopen_state->bs. |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4765 | */ |
Vladimir Sementsov-Ogievskiy | 53e96d1 | 2021-04-28 18:17:35 +0300 | [diff] [blame] | 4766 | static int bdrv_reopen_prepare(BDRVReopenState *reopen_state, |
Vladimir Sementsov-Ogievskiy | 72373e4 | 2021-04-28 18:17:58 +0300 | [diff] [blame] | 4767 | BlockReopenQueue *queue, |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4768 | Transaction *change_child_tran, Error **errp) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4769 | { |
| 4770 | int ret = -1; |
Alberto Garcia | e6d79c4 | 2018-11-12 16:00:47 +0200 | [diff] [blame] | 4771 | int old_flags; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4772 | Error *local_err = NULL; |
| 4773 | BlockDriver *drv; |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4774 | QemuOpts *opts; |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 4775 | QDict *orig_reopen_opts; |
Alberto Garcia | 593b307 | 2018-09-06 12:37:08 +0300 | [diff] [blame] | 4776 | char *discard = NULL; |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 4777 | bool read_only; |
Max Reitz | 9ad08c4 | 2018-11-16 17:45:24 +0100 | [diff] [blame] | 4778 | bool drv_prepared = false; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4779 | |
| 4780 | assert(reopen_state != NULL); |
| 4781 | assert(reopen_state->bs->drv != NULL); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 4782 | GLOBAL_STATE_CODE(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4783 | drv = reopen_state->bs->drv; |
| 4784 | |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 4785 | /* This function and each driver's bdrv_reopen_prepare() remove |
| 4786 | * entries from reopen_state->options as they are processed, so |
| 4787 | * we need to make a copy of the original QDict. */ |
| 4788 | orig_reopen_opts = qdict_clone_shallow(reopen_state->options); |
| 4789 | |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4790 | /* Process generic block layer options */ |
| 4791 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
Markus Armbruster | af175e8 | 2020-07-07 18:06:03 +0200 | [diff] [blame] | 4792 | if (!qemu_opts_absorb_qdict(opts, reopen_state->options, errp)) { |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4793 | ret = -EINVAL; |
| 4794 | goto error; |
| 4795 | } |
| 4796 | |
Alberto Garcia | e6d79c4 | 2018-11-12 16:00:47 +0200 | [diff] [blame] | 4797 | /* This was already called in bdrv_reopen_queue_child() so the flags |
| 4798 | * are up-to-date. This time we simply want to remove the options from |
| 4799 | * QemuOpts in order to indicate that they have been processed. */ |
| 4800 | old_flags = reopen_state->flags; |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 4801 | update_flags_from_options(&reopen_state->flags, opts); |
Alberto Garcia | e6d79c4 | 2018-11-12 16:00:47 +0200 | [diff] [blame] | 4802 | assert(old_flags == reopen_state->flags); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 4803 | |
Alberto Garcia | 415bbca | 2018-10-03 13:23:13 +0300 | [diff] [blame] | 4804 | discard = qemu_opt_get_del(opts, BDRV_OPT_DISCARD); |
Alberto Garcia | 593b307 | 2018-09-06 12:37:08 +0300 | [diff] [blame] | 4805 | if (discard != NULL) { |
| 4806 | if (bdrv_parse_discard_flags(discard, &reopen_state->flags) != 0) { |
| 4807 | error_setg(errp, "Invalid discard option"); |
| 4808 | ret = -EINVAL; |
| 4809 | goto error; |
| 4810 | } |
| 4811 | } |
| 4812 | |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 4813 | reopen_state->detect_zeroes = |
| 4814 | bdrv_parse_detect_zeroes(opts, reopen_state->flags, &local_err); |
| 4815 | if (local_err) { |
| 4816 | error_propagate(errp, local_err); |
| 4817 | ret = -EINVAL; |
| 4818 | goto error; |
| 4819 | } |
| 4820 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 4821 | /* All other options (including node-name and driver) must be unchanged. |
| 4822 | * Put them back into the QDict, so that they are checked at the end |
| 4823 | * of this function. */ |
| 4824 | qemu_opts_to_qdict(opts, reopen_state->options); |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4825 | |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 4826 | /* If we are to stay read-only, do not allow permission change |
| 4827 | * to r/w. Attempting to set to r/w may fail if either BDRV_O_ALLOW_RDWR is |
| 4828 | * not set, or if the BDS still has copy_on_read enabled */ |
| 4829 | read_only = !(reopen_state->flags & BDRV_O_RDWR); |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 4830 | ret = bdrv_can_set_read_only(reopen_state->bs, read_only, true, &local_err); |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 4831 | if (local_err) { |
| 4832 | error_propagate(errp, local_err); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4833 | goto error; |
| 4834 | } |
| 4835 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4836 | if (drv->bdrv_reopen_prepare) { |
Alberto Garcia | faf116b | 2019-03-12 18:48:49 +0200 | [diff] [blame] | 4837 | /* |
| 4838 | * If a driver-specific option is missing, it means that we |
| 4839 | * should reset it to its default value. |
| 4840 | * But not all options allow that, so we need to check it first. |
| 4841 | */ |
| 4842 | ret = bdrv_reset_options_allowed(reopen_state->bs, |
| 4843 | reopen_state->options, errp); |
| 4844 | if (ret) { |
| 4845 | goto error; |
| 4846 | } |
| 4847 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4848 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); |
| 4849 | if (ret) { |
| 4850 | if (local_err != NULL) { |
| 4851 | error_propagate(errp, local_err); |
| 4852 | } else { |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 4853 | bdrv_refresh_filename(reopen_state->bs); |
Luiz Capitulino | d8b6895 | 2013-06-10 11:29:27 -0400 | [diff] [blame] | 4854 | error_setg(errp, "failed while preparing to reopen image '%s'", |
| 4855 | reopen_state->bs->filename); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4856 | } |
| 4857 | goto error; |
| 4858 | } |
| 4859 | } else { |
| 4860 | /* It is currently mandatory to have a bdrv_reopen_prepare() |
| 4861 | * handler for each supported drv. */ |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 4862 | error_setg(errp, "Block format '%s' used by node '%s' " |
| 4863 | "does not support reopening files", drv->format_name, |
| 4864 | bdrv_get_device_or_node_name(reopen_state->bs)); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4865 | ret = -1; |
| 4866 | goto error; |
| 4867 | } |
| 4868 | |
Max Reitz | 9ad08c4 | 2018-11-16 17:45:24 +0100 | [diff] [blame] | 4869 | drv_prepared = true; |
| 4870 | |
Alberto Garcia | bacd9b8 | 2019-03-12 18:48:46 +0200 | [diff] [blame] | 4871 | /* |
| 4872 | * We must provide the 'backing' option if the BDS has a backing |
| 4873 | * file or if the image file has a backing file name as part of |
| 4874 | * its metadata. Otherwise the 'backing' option can be omitted. |
| 4875 | */ |
| 4876 | if (drv->supports_backing && reopen_state->backing_missing && |
Max Reitz | 1d42f48 | 2019-06-12 17:24:39 +0200 | [diff] [blame] | 4877 | (reopen_state->bs->backing || reopen_state->bs->backing_file[0])) { |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 4878 | error_setg(errp, "backing is missing for '%s'", |
| 4879 | reopen_state->bs->node_name); |
| 4880 | ret = -EINVAL; |
| 4881 | goto error; |
| 4882 | } |
| 4883 | |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4884 | /* |
| 4885 | * Allow changing the 'backing' option. The new value can be |
| 4886 | * either a reference to an existing node (using its node name) |
| 4887 | * or NULL to simply detach the current backing file. |
| 4888 | */ |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4889 | ret = bdrv_reopen_parse_file_or_backing(reopen_state, true, |
| 4890 | change_child_tran, errp); |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame] | 4891 | if (ret < 0) { |
| 4892 | goto error; |
| 4893 | } |
| 4894 | qdict_del(reopen_state->options, "backing"); |
| 4895 | |
Alberto Garcia | ecd30d2 | 2021-06-10 15:05:36 +0300 | [diff] [blame] | 4896 | /* Allow changing the 'file' option. In this case NULL is not allowed */ |
| 4897 | ret = bdrv_reopen_parse_file_or_backing(reopen_state, false, |
| 4898 | change_child_tran, errp); |
| 4899 | if (ret < 0) { |
| 4900 | goto error; |
| 4901 | } |
| 4902 | qdict_del(reopen_state->options, "file"); |
| 4903 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4904 | /* Options that are not handled are only okay if they are unchanged |
| 4905 | * compared to the old state. It is expected that some options are only |
| 4906 | * used for the initial open, but not reopen (e.g. filename) */ |
| 4907 | if (qdict_size(reopen_state->options)) { |
| 4908 | const QDictEntry *entry = qdict_first(reopen_state->options); |
| 4909 | |
| 4910 | do { |
Max Reitz | 54fd1b0 | 2017-11-14 19:01:26 +0100 | [diff] [blame] | 4911 | QObject *new = entry->value; |
| 4912 | QObject *old = qdict_get(reopen_state->bs->options, entry->key); |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4913 | |
Alberto Garcia | db90528 | 2018-09-06 12:37:05 +0300 | [diff] [blame] | 4914 | /* Allow child references (child_name=node_name) as long as they |
| 4915 | * point to the current child (i.e. everything stays the same). */ |
| 4916 | if (qobject_type(new) == QTYPE_QSTRING) { |
| 4917 | BdrvChild *child; |
| 4918 | QLIST_FOREACH(child, &reopen_state->bs->children, next) { |
| 4919 | if (!strcmp(child->name, entry->key)) { |
| 4920 | break; |
| 4921 | } |
| 4922 | } |
| 4923 | |
| 4924 | if (child) { |
Markus Armbruster | 410f44f | 2020-12-11 18:11:42 +0100 | [diff] [blame] | 4925 | if (!strcmp(child->bs->node_name, |
| 4926 | qstring_get_str(qobject_to(QString, new)))) { |
Alberto Garcia | db90528 | 2018-09-06 12:37:05 +0300 | [diff] [blame] | 4927 | continue; /* Found child with this name, skip option */ |
| 4928 | } |
| 4929 | } |
| 4930 | } |
| 4931 | |
Max Reitz | 54fd1b0 | 2017-11-14 19:01:26 +0100 | [diff] [blame] | 4932 | /* |
| 4933 | * TODO: When using -drive to specify blockdev options, all values |
| 4934 | * will be strings; however, when using -blockdev, blockdev-add or |
| 4935 | * filenames using the json:{} pseudo-protocol, they will be |
| 4936 | * correctly typed. |
| 4937 | * In contrast, reopening options are (currently) always strings |
| 4938 | * (because you can only specify them through qemu-io; all other |
| 4939 | * callers do not specify any options). |
| 4940 | * Therefore, when using anything other than -drive to create a BDS, |
| 4941 | * this cannot detect non-string options as unchanged, because |
| 4942 | * qobject_is_equal() always returns false for objects of different |
| 4943 | * type. In the future, this should be remedied by correctly typing |
| 4944 | * all options. For now, this is not too big of an issue because |
| 4945 | * the user can simply omit options which cannot be changed anyway, |
| 4946 | * so they will stay unchanged. |
| 4947 | */ |
| 4948 | if (!qobject_is_equal(new, old)) { |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 4949 | error_setg(errp, "Cannot change the option '%s'", entry->key); |
| 4950 | ret = -EINVAL; |
| 4951 | goto error; |
| 4952 | } |
| 4953 | } while ((entry = qdict_next(reopen_state->options, entry))); |
| 4954 | } |
| 4955 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4956 | ret = 0; |
| 4957 | |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 4958 | /* Restore the original reopen_state->options QDict */ |
| 4959 | qobject_unref(reopen_state->options); |
| 4960 | reopen_state->options = qobject_ref(orig_reopen_opts); |
| 4961 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4962 | error: |
Max Reitz | 9ad08c4 | 2018-11-16 17:45:24 +0100 | [diff] [blame] | 4963 | if (ret < 0 && drv_prepared) { |
| 4964 | /* drv->bdrv_reopen_prepare() has succeeded, so we need to |
| 4965 | * call drv->bdrv_reopen_abort() before signaling an error |
| 4966 | * (bdrv_reopen_multiple() will not call bdrv_reopen_abort() |
| 4967 | * when the respective bdrv_reopen_prepare() has failed) */ |
| 4968 | if (drv->bdrv_reopen_abort) { |
| 4969 | drv->bdrv_reopen_abort(reopen_state); |
| 4970 | } |
| 4971 | } |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 4972 | qemu_opts_del(opts); |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 4973 | qobject_unref(orig_reopen_opts); |
Alberto Garcia | 593b307 | 2018-09-06 12:37:08 +0300 | [diff] [blame] | 4974 | g_free(discard); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4975 | return ret; |
| 4976 | } |
| 4977 | |
| 4978 | /* |
| 4979 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and |
| 4980 | * makes them final by swapping the staging BlockDriverState contents into |
| 4981 | * the active BlockDriverState contents. |
| 4982 | */ |
Vladimir Sementsov-Ogievskiy | 53e96d1 | 2021-04-28 18:17:35 +0300 | [diff] [blame] | 4983 | static void bdrv_reopen_commit(BDRVReopenState *reopen_state) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4984 | { |
| 4985 | BlockDriver *drv; |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 4986 | BlockDriverState *bs; |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 4987 | BdrvChild *child; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4988 | |
| 4989 | assert(reopen_state != NULL); |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 4990 | bs = reopen_state->bs; |
| 4991 | drv = bs->drv; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4992 | assert(drv != NULL); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 4993 | GLOBAL_STATE_CODE(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 4994 | |
| 4995 | /* If there are any driver level actions to take */ |
| 4996 | if (drv->bdrv_reopen_commit) { |
| 4997 | drv->bdrv_reopen_commit(reopen_state); |
| 4998 | } |
| 4999 | |
| 5000 | /* set BDS specific flags now */ |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5001 | qobject_unref(bs->explicit_options); |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 5002 | qobject_unref(bs->options); |
Alberto Garcia | ab5b5228 | 2021-07-08 13:47:05 +0200 | [diff] [blame] | 5003 | qobject_ref(reopen_state->explicit_options); |
| 5004 | qobject_ref(reopen_state->options); |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 5005 | |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 5006 | bs->explicit_options = reopen_state->explicit_options; |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 5007 | bs->options = reopen_state->options; |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 5008 | bs->open_flags = reopen_state->flags; |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 5009 | bs->detect_zeroes = reopen_state->detect_zeroes; |
Kevin Wolf | 355ef4a | 2013-12-11 20:14:09 +0100 | [diff] [blame] | 5010 | |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 5011 | /* Remove child references from bs->options and bs->explicit_options. |
| 5012 | * Child options were already removed in bdrv_reopen_queue_child() */ |
| 5013 | QLIST_FOREACH(child, &bs->children, next) { |
| 5014 | qdict_del(bs->explicit_options, child->name); |
| 5015 | qdict_del(bs->options, child->name); |
| 5016 | } |
Vladimir Sementsov-Ogievskiy | 3d0e874 | 2021-06-10 15:05:35 +0300 | [diff] [blame] | 5017 | /* backing is probably removed, so it's not handled by previous loop */ |
| 5018 | qdict_del(bs->explicit_options, "backing"); |
| 5019 | qdict_del(bs->options, "backing"); |
| 5020 | |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 5021 | bdrv_graph_rdlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 1e4c797 | 2021-04-28 18:17:55 +0300 | [diff] [blame] | 5022 | bdrv_refresh_limits(bs, NULL, NULL); |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 5023 | bdrv_graph_rdunlock_main_loop(); |
Paolo Bonzini | 439cc33 | 2023-04-07 17:32:58 +0200 | [diff] [blame] | 5024 | bdrv_refresh_total_sectors(bs, bs->total_sectors); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5025 | } |
| 5026 | |
| 5027 | /* |
| 5028 | * Abort the reopen, and delete and free the staged changes in |
| 5029 | * reopen_state |
| 5030 | */ |
Vladimir Sementsov-Ogievskiy | 53e96d1 | 2021-04-28 18:17:35 +0300 | [diff] [blame] | 5031 | static void bdrv_reopen_abort(BDRVReopenState *reopen_state) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5032 | { |
| 5033 | BlockDriver *drv; |
| 5034 | |
| 5035 | assert(reopen_state != NULL); |
| 5036 | drv = reopen_state->bs->drv; |
| 5037 | assert(drv != NULL); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 5038 | GLOBAL_STATE_CODE(); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 5039 | |
| 5040 | if (drv->bdrv_reopen_abort) { |
| 5041 | drv->bdrv_reopen_abort(reopen_state); |
| 5042 | } |
| 5043 | } |
| 5044 | |
| 5045 | |
Max Reitz | 64dff52 | 2016-01-29 16:36:10 +0100 | [diff] [blame] | 5046 | static void bdrv_close(BlockDriverState *bs) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 5047 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5048 | BdrvAioNotifier *ban, *ban_next; |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5049 | BdrvChild *child, *next; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5050 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5051 | GLOBAL_STATE_CODE(); |
Max Reitz | 30f55fb | 2016-05-17 16:41:32 +0200 | [diff] [blame] | 5052 | assert(!bs->refcnt); |
Alberto Garcia | 99b7e77 | 2015-09-25 16:41:44 +0300 | [diff] [blame] | 5053 | |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 5054 | bdrv_drained_begin(bs); /* complete I/O */ |
Stefan Hajnoczi | 58fda17 | 2013-07-02 15:36:25 +0200 | [diff] [blame] | 5055 | bdrv_flush(bs); |
Fam Zheng | 53ec73e | 2015-05-29 18:53:14 +0800 | [diff] [blame] | 5056 | bdrv_drain(bs); /* in case flush left pending I/O */ |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 5057 | |
Paolo Bonzini | 3cbc002 | 2012-10-19 11:36:48 +0200 | [diff] [blame] | 5058 | if (bs->drv) { |
Vladimir Sementsov-Ogievskiy | 3c00529 | 2018-08-14 15:43:19 +0300 | [diff] [blame] | 5059 | if (bs->drv->bdrv_close) { |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5060 | /* Must unfreeze all children, so bdrv_unref_child() works */ |
Vladimir Sementsov-Ogievskiy | 3c00529 | 2018-08-14 15:43:19 +0300 | [diff] [blame] | 5061 | bs->drv->bdrv_close(bs); |
| 5062 | } |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 5063 | bs->drv = NULL; |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 5064 | } |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 5065 | |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5066 | QLIST_FOREACH_SAFE(child, &bs->children, next, next) { |
Alberto Garcia | dd4118c | 2019-05-13 16:46:17 +0300 | [diff] [blame] | 5067 | bdrv_unref_child(bs, child); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5068 | } |
| 5069 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 5070 | assert(!bs->backing); |
| 5071 | assert(!bs->file); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5072 | g_free(bs->opaque); |
| 5073 | bs->opaque = NULL; |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 5074 | qatomic_set(&bs->copy_on_read, 0); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5075 | bs->backing_file[0] = '\0'; |
| 5076 | bs->backing_format[0] = '\0'; |
| 5077 | bs->total_sectors = 0; |
| 5078 | bs->encrypted = false; |
| 5079 | bs->sg = false; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5080 | qobject_unref(bs->options); |
| 5081 | qobject_unref(bs->explicit_options); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5082 | bs->options = NULL; |
| 5083 | bs->explicit_options = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5084 | qobject_unref(bs->full_open_options); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5085 | bs->full_open_options = NULL; |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 5086 | g_free(bs->block_status_cache); |
| 5087 | bs->block_status_cache = NULL; |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 5088 | |
Vladimir Sementsov-Ogievskiy | cca43ae | 2017-06-28 15:05:16 +0300 | [diff] [blame] | 5089 | bdrv_release_named_dirty_bitmaps(bs); |
| 5090 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
| 5091 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5092 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 5093 | g_free(ban); |
| 5094 | } |
| 5095 | QLIST_INIT(&bs->aio_notifiers); |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 5096 | bdrv_drained_end(bs); |
Greg Kurz | 1a6d3bd | 2020-10-23 17:01:10 +0200 | [diff] [blame] | 5097 | |
| 5098 | /* |
| 5099 | * If we're still inside some bdrv_drain_all_begin()/end() sections, end |
| 5100 | * them now since this BDS won't exist anymore when bdrv_drain_all_end() |
| 5101 | * gets called. |
| 5102 | */ |
| 5103 | if (bs->quiesce_counter) { |
| 5104 | bdrv_drain_all_end_quiesce(bs); |
| 5105 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 5106 | } |
| 5107 | |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 5108 | void bdrv_close_all(void) |
| 5109 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5110 | GLOBAL_STATE_CODE(); |
Emanuele Giuseppe Esposito | 880eeec | 2022-09-26 05:32:04 -0400 | [diff] [blame] | 5111 | assert(job_next(NULL) == NULL); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 5112 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 5113 | /* Drop references from requests still in flight, such as canceled block |
| 5114 | * jobs whose AIO context has not been polled yet */ |
| 5115 | bdrv_drain_all(); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 5116 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 5117 | blk_remove_all_bs(); |
| 5118 | blockdev_close_all_bdrv_states(); |
| 5119 | |
Kevin Wolf | a1a2af0 | 2016-04-08 18:26:37 +0200 | [diff] [blame] | 5120 | assert(QTAILQ_EMPTY(&all_bdrv_states)); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 5121 | } |
| 5122 | |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 5123 | static bool should_update_child(BdrvChild *c, BlockDriverState *to) |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5124 | { |
Vladimir Sementsov-Ogievskiy | 2f30b7c | 2019-02-23 22:20:39 +0300 | [diff] [blame] | 5125 | GQueue *queue; |
| 5126 | GHashTable *found; |
| 5127 | bool ret; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5128 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 5129 | if (c->klass->stay_at_node) { |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 5130 | return false; |
| 5131 | } |
| 5132 | |
Max Reitz | ec9f10f | 2018-06-13 20:18:15 +0200 | [diff] [blame] | 5133 | /* If the child @c belongs to the BDS @to, replacing the current |
| 5134 | * c->bs by @to would mean to create a loop. |
| 5135 | * |
| 5136 | * Such a case occurs when appending a BDS to a backing chain. |
| 5137 | * For instance, imagine the following chain: |
| 5138 | * |
| 5139 | * guest device -> node A -> further backing chain... |
| 5140 | * |
| 5141 | * Now we create a new BDS B which we want to put on top of this |
| 5142 | * chain, so we first attach A as its backing node: |
| 5143 | * |
| 5144 | * node B |
| 5145 | * | |
| 5146 | * v |
| 5147 | * guest device -> node A -> further backing chain... |
| 5148 | * |
| 5149 | * Finally we want to replace A by B. When doing that, we want to |
| 5150 | * replace all pointers to A by pointers to B -- except for the |
| 5151 | * pointer from B because (1) that would create a loop, and (2) |
| 5152 | * that pointer should simply stay intact: |
| 5153 | * |
| 5154 | * guest device -> node B |
| 5155 | * | |
| 5156 | * v |
| 5157 | * node A -> further backing chain... |
| 5158 | * |
| 5159 | * In general, when replacing a node A (c->bs) by a node B (@to), |
| 5160 | * if A is a child of B, that means we cannot replace A by B there |
| 5161 | * because that would create a loop. Silently detaching A from B |
| 5162 | * 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] | 5163 | * place there is the most sensible choice. |
| 5164 | * |
| 5165 | * We would also create a loop in any cases where @c is only |
| 5166 | * indirectly referenced by @to. Prevent this by returning false |
| 5167 | * if @c is found (by breadth-first search) anywhere in the whole |
| 5168 | * subtree of @to. |
| 5169 | */ |
| 5170 | |
| 5171 | ret = true; |
| 5172 | found = g_hash_table_new(NULL, NULL); |
| 5173 | g_hash_table_add(found, to); |
| 5174 | queue = g_queue_new(); |
| 5175 | g_queue_push_tail(queue, to); |
| 5176 | |
| 5177 | while (!g_queue_is_empty(queue)) { |
| 5178 | BlockDriverState *v = g_queue_pop_head(queue); |
| 5179 | BdrvChild *c2; |
| 5180 | |
| 5181 | QLIST_FOREACH(c2, &v->children, next) { |
| 5182 | if (c2 == c) { |
| 5183 | ret = false; |
| 5184 | break; |
| 5185 | } |
| 5186 | |
| 5187 | if (g_hash_table_contains(found, c2->bs)) { |
| 5188 | continue; |
| 5189 | } |
| 5190 | |
| 5191 | g_queue_push_tail(queue, c2->bs); |
| 5192 | g_hash_table_add(found, c2->bs); |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 5193 | } |
| 5194 | } |
| 5195 | |
Vladimir Sementsov-Ogievskiy | 2f30b7c | 2019-02-23 22:20:39 +0300 | [diff] [blame] | 5196 | g_queue_free(queue); |
| 5197 | g_hash_table_destroy(found); |
| 5198 | |
| 5199 | return ret; |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 5200 | } |
| 5201 | |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 5202 | static void bdrv_remove_child_commit(void *opaque) |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5203 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 5204 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 5205 | bdrv_child_free(opaque); |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5206 | } |
| 5207 | |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 5208 | static TransactionActionDrv bdrv_remove_child_drv = { |
| 5209 | .commit = bdrv_remove_child_commit, |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5210 | }; |
| 5211 | |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 5212 | /* Function doesn't update permissions, caller is responsible for this. */ |
| 5213 | static void bdrv_remove_child(BdrvChild *child, Transaction *tran) |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5214 | { |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5215 | if (!child) { |
| 5216 | return; |
| 5217 | } |
| 5218 | |
| 5219 | if (child->bs) { |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 5220 | BlockDriverState *bs = child->bs; |
| 5221 | bdrv_drained_begin(bs); |
Vladimir Sementsov-Ogievskiy | a2c37a3 | 2022-07-26 23:11:30 +0300 | [diff] [blame] | 5222 | bdrv_replace_child_tran(child, NULL, tran); |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 5223 | bdrv_drained_end(bs); |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5224 | } |
| 5225 | |
Vladimir Sementsov-Ogievskiy | 57f0894 | 2022-07-26 23:11:34 +0300 | [diff] [blame] | 5226 | tran_add(tran, &bdrv_remove_child_drv, child); |
Vladimir Sementsov-Ogievskiy | 46541ee | 2021-04-28 18:17:50 +0300 | [diff] [blame] | 5227 | } |
| 5228 | |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 5229 | static void undrain_on_clean_cb(void *opaque) |
| 5230 | { |
| 5231 | bdrv_drained_end(opaque); |
| 5232 | } |
| 5233 | |
| 5234 | static TransactionActionDrv undrain_on_clean = { |
| 5235 | .clean = undrain_on_clean_cb, |
| 5236 | }; |
| 5237 | |
Vladimir Sementsov-Ogievskiy | 117caba | 2021-04-28 18:17:48 +0300 | [diff] [blame] | 5238 | static int bdrv_replace_node_noperm(BlockDriverState *from, |
| 5239 | BlockDriverState *to, |
| 5240 | bool auto_skip, Transaction *tran, |
| 5241 | Error **errp) |
| 5242 | { |
| 5243 | BdrvChild *c, *next; |
| 5244 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 5245 | GLOBAL_STATE_CODE(); |
Hanna Reitz | 82b54cf | 2021-11-15 15:54:04 +0100 | [diff] [blame] | 5246 | |
Kevin Wolf | 2398747 | 2022-11-18 18:41:09 +0100 | [diff] [blame] | 5247 | bdrv_drained_begin(from); |
| 5248 | bdrv_drained_begin(to); |
| 5249 | tran_add(tran, &undrain_on_clean, from); |
| 5250 | tran_add(tran, &undrain_on_clean, to); |
| 5251 | |
Vladimir Sementsov-Ogievskiy | 117caba | 2021-04-28 18:17:48 +0300 | [diff] [blame] | 5252 | QLIST_FOREACH_SAFE(c, &from->parents, next_parent, next) { |
| 5253 | assert(c->bs == from); |
| 5254 | if (!should_update_child(c, to)) { |
| 5255 | if (auto_skip) { |
| 5256 | continue; |
| 5257 | } |
| 5258 | error_setg(errp, "Should not change '%s' link to '%s'", |
| 5259 | c->name, from->node_name); |
| 5260 | return -EINVAL; |
| 5261 | } |
| 5262 | if (c->frozen) { |
| 5263 | error_setg(errp, "Cannot change '%s' link to '%s'", |
| 5264 | c->name, from->node_name); |
| 5265 | return -EPERM; |
| 5266 | } |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 5267 | bdrv_replace_child_tran(c, to, tran); |
Vladimir Sementsov-Ogievskiy | 117caba | 2021-04-28 18:17:48 +0300 | [diff] [blame] | 5268 | } |
| 5269 | |
| 5270 | return 0; |
| 5271 | } |
| 5272 | |
Vladimir Sementsov-Ogievskiy | 313274b | 2020-11-06 15:42:36 +0300 | [diff] [blame] | 5273 | /* |
| 5274 | * With auto_skip=true bdrv_replace_node_common skips updating from parents |
| 5275 | * if it creates a parent-child relation loop or if parent is block-job. |
| 5276 | * |
| 5277 | * With auto_skip=false the error is returned if from has a parent which should |
| 5278 | * not be updated. |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5279 | * |
| 5280 | * With @detach_subchain=true @to must be in a backing chain of @from. In this |
| 5281 | * case backing link of the cow-parent of @to is removed. |
Vladimir Sementsov-Ogievskiy | 313274b | 2020-11-06 15:42:36 +0300 | [diff] [blame] | 5282 | */ |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 5283 | static int bdrv_replace_node_common(BlockDriverState *from, |
| 5284 | BlockDriverState *to, |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5285 | bool auto_skip, bool detach_subchain, |
| 5286 | Error **errp) |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5287 | { |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5288 | Transaction *tran = tran_new(); |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5289 | g_autoptr(GSList) refresh_list = NULL; |
Miroslav Rezanina | 2d369d6 | 2021-05-05 03:59:03 -0400 | [diff] [blame] | 5290 | BlockDriverState *to_cow_parent = NULL; |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5291 | int ret; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5292 | |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 5293 | GLOBAL_STATE_CODE(); |
Hanna Reitz | 82b54cf | 2021-11-15 15:54:04 +0100 | [diff] [blame] | 5294 | |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5295 | if (detach_subchain) { |
| 5296 | assert(bdrv_chain_contains(from, to)); |
| 5297 | assert(from != to); |
| 5298 | for (to_cow_parent = from; |
| 5299 | bdrv_filter_or_cow_bs(to_cow_parent) != to; |
| 5300 | to_cow_parent = bdrv_filter_or_cow_bs(to_cow_parent)) |
| 5301 | { |
| 5302 | ; |
| 5303 | } |
| 5304 | } |
| 5305 | |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5306 | /* Make sure that @from doesn't go away until we have successfully attached |
| 5307 | * all of its parents to @to. */ |
| 5308 | bdrv_ref(from); |
| 5309 | |
Kevin Wolf | f871abd | 2019-05-21 19:00:25 +0200 | [diff] [blame] | 5310 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); |
Kevin Wolf | 30dd65f | 2020-03-10 12:38:29 +0100 | [diff] [blame] | 5311 | assert(bdrv_get_aio_context(from) == bdrv_get_aio_context(to)); |
Kevin Wolf | f871abd | 2019-05-21 19:00:25 +0200 | [diff] [blame] | 5312 | bdrv_drained_begin(from); |
| 5313 | |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5314 | /* |
| 5315 | * Do the replacement without permission update. |
| 5316 | * Replacement may influence the permissions, we should calculate new |
| 5317 | * permissions based on new graph. If we fail, we'll roll-back the |
| 5318 | * replacement. |
| 5319 | */ |
Vladimir Sementsov-Ogievskiy | 117caba | 2021-04-28 18:17:48 +0300 | [diff] [blame] | 5320 | ret = bdrv_replace_node_noperm(from, to, auto_skip, tran, errp); |
| 5321 | if (ret < 0) { |
| 5322 | goto out; |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5323 | } |
| 5324 | |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5325 | if (detach_subchain) { |
Vladimir Sementsov-Ogievskiy | f38eaec | 2022-11-07 19:35:56 +0300 | [diff] [blame] | 5326 | 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] | 5327 | } |
| 5328 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 5329 | refresh_list = g_slist_prepend(refresh_list, to); |
| 5330 | refresh_list = g_slist_prepend(refresh_list, from); |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5331 | |
| 5332 | ret = bdrv_list_refresh_perms(refresh_list, NULL, tran, errp); |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5333 | if (ret < 0) { |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5334 | goto out; |
| 5335 | } |
| 5336 | |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 5337 | ret = 0; |
| 5338 | |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5339 | out: |
Vladimir Sementsov-Ogievskiy | 3bb0e29 | 2021-04-28 18:17:45 +0300 | [diff] [blame] | 5340 | tran_finalize(tran, ret); |
| 5341 | |
Kevin Wolf | f871abd | 2019-05-21 19:00:25 +0200 | [diff] [blame] | 5342 | bdrv_drained_end(from); |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5343 | bdrv_unref(from); |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 5344 | |
| 5345 | return ret; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5346 | } |
| 5347 | |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 5348 | int bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, |
| 5349 | Error **errp) |
Vladimir Sementsov-Ogievskiy | 313274b | 2020-11-06 15:42:36 +0300 | [diff] [blame] | 5350 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5351 | GLOBAL_STATE_CODE(); |
| 5352 | |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5353 | return bdrv_replace_node_common(from, to, true, false, errp); |
| 5354 | } |
| 5355 | |
| 5356 | int bdrv_drop_filter(BlockDriverState *bs, Error **errp) |
| 5357 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5358 | GLOBAL_STATE_CODE(); |
| 5359 | |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5360 | return bdrv_replace_node_common(bs, bdrv_filter_or_cow_bs(bs), true, true, |
| 5361 | errp); |
Vladimir Sementsov-Ogievskiy | 313274b | 2020-11-06 15:42:36 +0300 | [diff] [blame] | 5362 | } |
| 5363 | |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5364 | /* |
| 5365 | * Add new bs contents at the top of an image chain while the chain is |
| 5366 | * live, while keeping required fields on the top layer. |
| 5367 | * |
| 5368 | * This will modify the BlockDriverState fields, and swap contents |
| 5369 | * between bs_new and bs_top. Both bs_new and bs_top are modified. |
| 5370 | * |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5371 | * bs_new must not be attached to a BlockBackend and must not have backing |
| 5372 | * child. |
Jeff Cody | f6801b8 | 2012-03-27 16:30:19 -0400 | [diff] [blame] | 5373 | * |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5374 | * This function does not create any image files. |
Stefano Garzarella | 60d90bf | 2023-02-14 18:16:21 +0100 | [diff] [blame] | 5375 | * |
| 5376 | * The caller must hold the AioContext lock for @bs_top. |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5377 | */ |
Vladimir Sementsov-Ogievskiy | a1e708f | 2021-02-02 15:49:43 +0300 | [diff] [blame] | 5378 | int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, |
| 5379 | Error **errp) |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5380 | { |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5381 | int ret; |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 5382 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5383 | Transaction *tran = tran_new(); |
Stefano Garzarella | 60d90bf | 2023-02-14 18:16:21 +0100 | [diff] [blame] | 5384 | AioContext *old_context, *new_context = NULL; |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5385 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5386 | GLOBAL_STATE_CODE(); |
| 5387 | |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5388 | assert(!bs_new->backing); |
| 5389 | |
Stefano Garzarella | 60d90bf | 2023-02-14 18:16:21 +0100 | [diff] [blame] | 5390 | old_context = bdrv_get_aio_context(bs_top); |
| 5391 | |
Vladimir Sementsov-Ogievskiy | 5bb04747 | 2022-07-26 23:11:32 +0300 | [diff] [blame] | 5392 | child = bdrv_attach_child_noperm(bs_new, bs_top, "backing", |
| 5393 | &child_of_bds, bdrv_backing_role(bs_new), |
| 5394 | tran, errp); |
| 5395 | if (!child) { |
| 5396 | ret = -EINVAL; |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5397 | goto out; |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 5398 | } |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5399 | |
Stefano Garzarella | 60d90bf | 2023-02-14 18:16:21 +0100 | [diff] [blame] | 5400 | /* |
| 5401 | * bdrv_attach_child_noperm could change the AioContext of bs_top. |
| 5402 | * bdrv_replace_node_noperm calls bdrv_drained_begin, so let's temporarily |
| 5403 | * hold the new AioContext, since bdrv_drained_begin calls BDRV_POLL_WHILE |
| 5404 | * that assumes the new lock is taken. |
| 5405 | */ |
| 5406 | new_context = bdrv_get_aio_context(bs_top); |
| 5407 | |
| 5408 | if (old_context != new_context) { |
| 5409 | aio_context_release(old_context); |
| 5410 | aio_context_acquire(new_context); |
| 5411 | } |
| 5412 | |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5413 | 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] | 5414 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5415 | goto out; |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 5416 | } |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 5417 | |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 5418 | ret = bdrv_refresh_perms(bs_new, tran, errp); |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5419 | out: |
| 5420 | tran_finalize(tran, ret); |
| 5421 | |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 5422 | bdrv_graph_rdlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 1e4c797 | 2021-04-28 18:17:55 +0300 | [diff] [blame] | 5423 | bdrv_refresh_limits(bs_top, NULL, NULL); |
Kevin Wolf | e19b157 | 2023-05-04 13:57:50 +0200 | [diff] [blame] | 5424 | bdrv_graph_rdunlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5425 | |
Stefano Garzarella | 60d90bf | 2023-02-14 18:16:21 +0100 | [diff] [blame] | 5426 | if (new_context && old_context != new_context) { |
| 5427 | aio_context_release(new_context); |
| 5428 | aio_context_acquire(old_context); |
| 5429 | } |
| 5430 | |
Vladimir Sementsov-Ogievskiy | 2272edc | 2021-04-28 18:17:49 +0300 | [diff] [blame] | 5431 | return ret; |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 5432 | } |
| 5433 | |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5434 | /* Not for empty child */ |
| 5435 | int bdrv_replace_child_bs(BdrvChild *child, BlockDriverState *new_bs, |
| 5436 | Error **errp) |
| 5437 | { |
| 5438 | int ret; |
| 5439 | Transaction *tran = tran_new(); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5440 | g_autoptr(GSList) refresh_list = NULL; |
| 5441 | BlockDriverState *old_bs = child->bs; |
| 5442 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5443 | GLOBAL_STATE_CODE(); |
| 5444 | |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5445 | bdrv_ref(old_bs); |
| 5446 | bdrv_drained_begin(old_bs); |
| 5447 | bdrv_drained_begin(new_bs); |
| 5448 | |
Vladimir Sementsov-Ogievskiy | 0f0b1e2 | 2022-07-26 23:11:29 +0300 | [diff] [blame] | 5449 | bdrv_replace_child_tran(child, new_bs, tran); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5450 | |
Vladimir Sementsov-Ogievskiy | fb0ff4d | 2022-11-07 19:35:58 +0300 | [diff] [blame] | 5451 | refresh_list = g_slist_prepend(refresh_list, old_bs); |
| 5452 | refresh_list = g_slist_prepend(refresh_list, new_bs); |
Vladimir Sementsov-Ogievskiy | bd8f4c4 | 2021-08-24 11:38:23 +0300 | [diff] [blame] | 5453 | |
| 5454 | ret = bdrv_list_refresh_perms(refresh_list, NULL, tran, errp); |
| 5455 | |
| 5456 | tran_finalize(tran, ret); |
| 5457 | |
| 5458 | bdrv_drained_end(old_bs); |
| 5459 | bdrv_drained_end(new_bs); |
| 5460 | bdrv_unref(old_bs); |
| 5461 | |
| 5462 | return ret; |
| 5463 | } |
| 5464 | |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 5465 | static void bdrv_delete(BlockDriverState *bs) |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 5466 | { |
Fam Zheng | 3718d8a | 2014-05-23 21:29:43 +0800 | [diff] [blame] | 5467 | assert(bdrv_op_blocker_is_empty(bs)); |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 5468 | assert(!bs->refcnt); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5469 | GLOBAL_STATE_CODE(); |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 5470 | |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 5471 | /* remove from list, if necessary */ |
Kevin Wolf | 63eaaae | 2016-03-18 10:46:57 +0100 | [diff] [blame] | 5472 | if (bs->node_name[0] != '\0') { |
| 5473 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); |
| 5474 | } |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 5475 | QTAILQ_REMOVE(&all_bdrv_states, bs, bs_list); |
| 5476 | |
Anton Kuchin | 30c321f | 2019-05-07 11:12:56 +0300 | [diff] [blame] | 5477 | bdrv_close(bs); |
| 5478 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 5479 | g_free(bs); |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 5480 | } |
| 5481 | |
Vladimir Sementsov-Ogievskiy | 96796fa | 2021-09-20 14:55:36 +0300 | [diff] [blame] | 5482 | |
| 5483 | /* |
| 5484 | * Replace @bs by newly created block node. |
| 5485 | * |
| 5486 | * @options is a QDict of options to pass to the block drivers, or NULL for an |
| 5487 | * empty set of options. The reference to the QDict belongs to the block layer |
| 5488 | * after the call (even on failure), so if the caller intends to reuse the |
| 5489 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. |
Kevin Wolf | 8823407 | 2023-05-25 14:47:11 +0200 | [diff] [blame] | 5490 | * |
| 5491 | * The caller holds the AioContext lock for @bs. It must make sure that @bs |
| 5492 | * stays in the same AioContext, i.e. @options must not refer to nodes in a |
| 5493 | * different AioContext. |
Vladimir Sementsov-Ogievskiy | 96796fa | 2021-09-20 14:55:36 +0300 | [diff] [blame] | 5494 | */ |
| 5495 | BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *options, |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5496 | int flags, Error **errp) |
| 5497 | { |
Vladimir Sementsov-Ogievskiy | f053b7e | 2021-09-20 14:55:35 +0300 | [diff] [blame] | 5498 | ERRP_GUARD(); |
| 5499 | int ret; |
Kevin Wolf | 8823407 | 2023-05-25 14:47:11 +0200 | [diff] [blame] | 5500 | AioContext *ctx = bdrv_get_aio_context(bs); |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5501 | BlockDriverState *new_node_bs = NULL; |
| 5502 | const char *drvname, *node_name; |
| 5503 | BlockDriver *drv; |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5504 | |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5505 | drvname = qdict_get_try_str(options, "driver"); |
| 5506 | if (!drvname) { |
| 5507 | error_setg(errp, "driver is not specified"); |
| 5508 | goto fail; |
| 5509 | } |
| 5510 | |
| 5511 | drv = bdrv_find_format(drvname); |
| 5512 | if (!drv) { |
| 5513 | error_setg(errp, "Unknown driver: '%s'", drvname); |
| 5514 | goto fail; |
| 5515 | } |
| 5516 | |
| 5517 | node_name = qdict_get_try_str(options, "node-name"); |
| 5518 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5519 | GLOBAL_STATE_CODE(); |
| 5520 | |
Kevin Wolf | 8823407 | 2023-05-25 14:47:11 +0200 | [diff] [blame] | 5521 | aio_context_release(ctx); |
| 5522 | aio_context_acquire(qemu_get_aio_context()); |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5523 | new_node_bs = bdrv_new_open_driver_opts(drv, node_name, options, flags, |
| 5524 | errp); |
Kevin Wolf | 8823407 | 2023-05-25 14:47:11 +0200 | [diff] [blame] | 5525 | aio_context_release(qemu_get_aio_context()); |
| 5526 | aio_context_acquire(ctx); |
| 5527 | assert(bdrv_get_aio_context(bs) == ctx); |
| 5528 | |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5529 | options = NULL; /* bdrv_new_open_driver() eats options */ |
| 5530 | if (!new_node_bs) { |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5531 | error_prepend(errp, "Could not create node: "); |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5532 | goto fail; |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5533 | } |
| 5534 | |
| 5535 | bdrv_drained_begin(bs); |
Vladimir Sementsov-Ogievskiy | f053b7e | 2021-09-20 14:55:35 +0300 | [diff] [blame] | 5536 | ret = bdrv_replace_node(bs, new_node_bs, errp); |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5537 | bdrv_drained_end(bs); |
| 5538 | |
Vladimir Sementsov-Ogievskiy | f053b7e | 2021-09-20 14:55:35 +0300 | [diff] [blame] | 5539 | if (ret < 0) { |
| 5540 | error_prepend(errp, "Could not replace node: "); |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5541 | goto fail; |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5542 | } |
| 5543 | |
| 5544 | return new_node_bs; |
Vladimir Sementsov-Ogievskiy | b11c873 | 2021-09-20 14:55:37 +0300 | [diff] [blame] | 5545 | |
| 5546 | fail: |
| 5547 | qobject_unref(options); |
| 5548 | bdrv_unref(new_node_bs); |
| 5549 | return NULL; |
Andrey Shinkevich | 8872ef7 | 2020-12-16 09:16:52 +0300 | [diff] [blame] | 5550 | } |
| 5551 | |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 5552 | /* |
| 5553 | * Run consistency checks on an image |
| 5554 | * |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 5555 | * 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] | 5556 | * 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] | 5557 | * check are stored in res. |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 5558 | */ |
Vladimir Sementsov-Ogievskiy | 21c2283 | 2020-09-24 21:54:10 +0300 | [diff] [blame] | 5559 | int coroutine_fn bdrv_co_check(BlockDriverState *bs, |
| 5560 | BdrvCheckResult *res, BdrvCheckMode fix) |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 5561 | { |
Emanuele Giuseppe Esposito | 1581a70 | 2022-03-03 10:16:09 -0500 | [diff] [blame] | 5562 | IO_CODE(); |
Kevin Wolf | 1b3ff9f | 2022-12-07 14:18:38 +0100 | [diff] [blame] | 5563 | assert_bdrv_graph_readable(); |
Max Reitz | 908bcd5 | 2014-08-07 22:47:55 +0200 | [diff] [blame] | 5564 | if (bs->drv == NULL) { |
| 5565 | return -ENOMEDIUM; |
| 5566 | } |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 5567 | if (bs->drv->bdrv_co_check == NULL) { |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 5568 | return -ENOTSUP; |
| 5569 | } |
| 5570 | |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 5571 | memset(res, 0, sizeof(*res)); |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 5572 | return bs->drv->bdrv_co_check(bs, res, fix); |
| 5573 | } |
| 5574 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5575 | /* |
| 5576 | * Return values: |
| 5577 | * 0 - success |
| 5578 | * -EINVAL - backing format specified, but no file |
| 5579 | * -ENOSPC - can't update the backing file because no space is left in the |
| 5580 | * image file header |
| 5581 | * -ENOTSUP - format driver doesn't support changing the backing file |
| 5582 | */ |
Eric Blake | e54ee1b | 2020-07-06 15:39:53 -0500 | [diff] [blame] | 5583 | int bdrv_change_backing_file(BlockDriverState *bs, const char *backing_file, |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 5584 | const char *backing_fmt, bool require) |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5585 | { |
| 5586 | BlockDriver *drv = bs->drv; |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5587 | int ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5588 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5589 | GLOBAL_STATE_CODE(); |
| 5590 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 5591 | if (!drv) { |
| 5592 | return -ENOMEDIUM; |
| 5593 | } |
| 5594 | |
Paolo Bonzini | 5f37779 | 2012-04-12 14:01:01 +0200 | [diff] [blame] | 5595 | /* Backing file format doesn't make sense without a backing file */ |
| 5596 | if (backing_fmt && !backing_file) { |
| 5597 | return -EINVAL; |
| 5598 | } |
| 5599 | |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 5600 | if (require && backing_file && !backing_fmt) { |
| 5601 | return -EINVAL; |
Eric Blake | e54ee1b | 2020-07-06 15:39:53 -0500 | [diff] [blame] | 5602 | } |
| 5603 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5604 | if (drv->bdrv_change_backing_file != NULL) { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5605 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5606 | } else { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5607 | ret = -ENOTSUP; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5608 | } |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5609 | |
| 5610 | if (ret == 0) { |
| 5611 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
| 5612 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 5613 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), |
| 5614 | backing_file ?: ""); |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 5615 | } |
| 5616 | return ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 5617 | } |
| 5618 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5619 | /* |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 5620 | * Finds the first non-filter node above bs in the chain between |
| 5621 | * active and bs. The returned node is either an immediate parent of |
| 5622 | * bs, or there are only filter nodes between the two. |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5623 | * |
| 5624 | * Returns NULL if bs is not found in active's image chain, |
| 5625 | * or if active == bs. |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 5626 | * |
| 5627 | * Returns the bottommost base image if bs == NULL. |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5628 | */ |
| 5629 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, |
| 5630 | BlockDriverState *bs) |
| 5631 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5632 | |
| 5633 | GLOBAL_STATE_CODE(); |
| 5634 | |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 5635 | bs = bdrv_skip_filters(bs); |
| 5636 | active = bdrv_skip_filters(active); |
| 5637 | |
| 5638 | while (active) { |
| 5639 | BlockDriverState *next = bdrv_backing_chain_next(active); |
| 5640 | if (bs == next) { |
| 5641 | return active; |
| 5642 | } |
| 5643 | active = next; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5644 | } |
| 5645 | |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 5646 | return NULL; |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 5647 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5648 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 5649 | /* Given a BDS, searches for the base layer. */ |
| 5650 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
| 5651 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5652 | GLOBAL_STATE_CODE(); |
| 5653 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 5654 | return bdrv_find_overlay(bs, NULL); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5655 | } |
| 5656 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5657 | /* |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5658 | * Return true if at least one of the COW (backing) and filter links |
| 5659 | * 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] | 5660 | * @base must be reachable from @bs, or NULL. |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5661 | */ |
| 5662 | bool bdrv_is_backing_chain_frozen(BlockDriverState *bs, BlockDriverState *base, |
| 5663 | Error **errp) |
| 5664 | { |
| 5665 | BlockDriverState *i; |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5666 | BdrvChild *child; |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5667 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5668 | GLOBAL_STATE_CODE(); |
| 5669 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5670 | for (i = bs; i != base; i = child_bs(child)) { |
| 5671 | child = bdrv_filter_or_cow_child(i); |
| 5672 | |
| 5673 | if (child && child->frozen) { |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5674 | error_setg(errp, "Cannot change '%s' link from '%s' to '%s'", |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5675 | child->name, i->node_name, child->bs->node_name); |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5676 | return true; |
| 5677 | } |
| 5678 | } |
| 5679 | |
| 5680 | return false; |
| 5681 | } |
| 5682 | |
| 5683 | /* |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5684 | * Freeze all COW (backing) and filter links between @bs and @base. |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5685 | * If any of the links is already frozen the operation is aborted and |
| 5686 | * none of the links are modified. |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5687 | * @base must be reachable from @bs, or NULL. |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5688 | * Returns 0 on success. On failure returns < 0 and sets @errp. |
| 5689 | */ |
| 5690 | int bdrv_freeze_backing_chain(BlockDriverState *bs, BlockDriverState *base, |
| 5691 | Error **errp) |
| 5692 | { |
| 5693 | BlockDriverState *i; |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5694 | BdrvChild *child; |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5695 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5696 | GLOBAL_STATE_CODE(); |
| 5697 | |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5698 | if (bdrv_is_backing_chain_frozen(bs, base, errp)) { |
| 5699 | return -EPERM; |
| 5700 | } |
| 5701 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5702 | for (i = bs; i != base; i = child_bs(child)) { |
| 5703 | child = bdrv_filter_or_cow_child(i); |
| 5704 | if (child && child->bs->never_freeze) { |
Max Reitz | e5182c1 | 2019-07-03 19:28:02 +0200 | [diff] [blame] | 5705 | error_setg(errp, "Cannot freeze '%s' link to '%s'", |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5706 | child->name, child->bs->node_name); |
Max Reitz | e5182c1 | 2019-07-03 19:28:02 +0200 | [diff] [blame] | 5707 | return -EPERM; |
| 5708 | } |
| 5709 | } |
| 5710 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5711 | for (i = bs; i != base; i = child_bs(child)) { |
| 5712 | child = bdrv_filter_or_cow_child(i); |
| 5713 | if (child) { |
| 5714 | child->frozen = true; |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5715 | } |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5716 | } |
| 5717 | |
| 5718 | return 0; |
| 5719 | } |
| 5720 | |
| 5721 | /* |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5722 | * Unfreeze all COW (backing) and filter links between @bs and @base. |
| 5723 | * The caller must ensure that all links are frozen before using this |
| 5724 | * function. |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5725 | * @base must be reachable from @bs, or NULL. |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5726 | */ |
| 5727 | void bdrv_unfreeze_backing_chain(BlockDriverState *bs, BlockDriverState *base) |
| 5728 | { |
| 5729 | BlockDriverState *i; |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5730 | BdrvChild *child; |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5731 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5732 | GLOBAL_STATE_CODE(); |
| 5733 | |
Max Reitz | 7b99a26 | 2019-06-12 16:07:11 +0200 | [diff] [blame] | 5734 | for (i = bs; i != base; i = child_bs(child)) { |
| 5735 | child = bdrv_filter_or_cow_child(i); |
| 5736 | if (child) { |
| 5737 | assert(child->frozen); |
| 5738 | child->frozen = false; |
Alberto Garcia | 0f0998f | 2019-03-28 18:25:09 +0200 | [diff] [blame] | 5739 | } |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 5740 | } |
| 5741 | } |
| 5742 | |
| 5743 | /* |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5744 | * Drops images above 'base' up to and including 'top', and sets the image |
| 5745 | * above 'top' to have base as its backing file. |
| 5746 | * |
| 5747 | * Requires that the overlay to 'top' is opened r/w, so that the backing file |
| 5748 | * information in 'bs' can be properly updated. |
| 5749 | * |
| 5750 | * E.g., this will convert the following chain: |
| 5751 | * bottom <- base <- intermediate <- top <- active |
| 5752 | * |
| 5753 | * to |
| 5754 | * |
| 5755 | * bottom <- base <- active |
| 5756 | * |
| 5757 | * It is allowed for bottom==base, in which case it converts: |
| 5758 | * |
| 5759 | * base <- intermediate <- top <- active |
| 5760 | * |
| 5761 | * to |
| 5762 | * |
| 5763 | * base <- active |
| 5764 | * |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 5765 | * If backing_file_str is non-NULL, it will be used when modifying top's |
| 5766 | * overlay image metadata. |
| 5767 | * |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5768 | * Error conditions: |
| 5769 | * if active == top, that is considered an error |
| 5770 | * |
| 5771 | */ |
Kevin Wolf | bde7071 | 2017-06-27 20:36:18 +0200 | [diff] [blame] | 5772 | int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base, |
| 5773 | const char *backing_file_str) |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5774 | { |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 5775 | BlockDriverState *explicit_top = top; |
| 5776 | bool update_inherits_from; |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5777 | BdrvChild *c; |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 5778 | Error *local_err = NULL; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5779 | int ret = -EIO; |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5780 | g_autoptr(GSList) updated_children = NULL; |
| 5781 | GSList *p; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5782 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 5783 | GLOBAL_STATE_CODE(); |
| 5784 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 5785 | bdrv_ref(top); |
Kevin Wolf | 631086d | 2022-11-18 18:41:03 +0100 | [diff] [blame] | 5786 | bdrv_drained_begin(base); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 5787 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5788 | if (!top->drv || !base->drv) { |
| 5789 | goto exit; |
| 5790 | } |
| 5791 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 5792 | /* Make sure that base is in the backing chain of top */ |
| 5793 | if (!bdrv_chain_contains(top, base)) { |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5794 | goto exit; |
| 5795 | } |
| 5796 | |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 5797 | /* If 'base' recursively inherits from 'top' then we should set |
| 5798 | * base->inherits_from to top->inherits_from after 'top' and all |
| 5799 | * other intermediate nodes have been dropped. |
| 5800 | * If 'top' is an implicit node (e.g. "commit_top") we should skip |
| 5801 | * 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] | 5802 | explicit_top = bdrv_skip_implicit_filters(explicit_top); |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 5803 | update_inherits_from = bdrv_inherits_from_recursive(base, explicit_top); |
| 5804 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5805 | /* success - we can delete the intermediate states, and link top->base */ |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 5806 | if (!backing_file_str) { |
| 5807 | bdrv_refresh_filename(base); |
| 5808 | backing_file_str = base->filename; |
| 5809 | } |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 5810 | |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5811 | QLIST_FOREACH(c, &top->parents, next_parent) { |
| 5812 | updated_children = g_slist_prepend(updated_children, c); |
| 5813 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 5814 | |
Vladimir Sementsov-Ogievskiy | 3108a15 | 2021-04-28 18:17:51 +0300 | [diff] [blame] | 5815 | /* |
| 5816 | * It seems correct to pass detach_subchain=true here, but it triggers |
| 5817 | * one more yet not fixed bug, when due to nested aio_poll loop we switch to |
| 5818 | * another drained section, which modify the graph (for example, removing |
| 5819 | * the child, which we keep in updated_children list). So, it's a TODO. |
| 5820 | * |
| 5821 | * Note, bug triggered if pass detach_subchain=true here and run |
| 5822 | * test-bdrv-drain. test_drop_intermediate_poll() test-case will crash. |
| 5823 | * That's a FIXME. |
| 5824 | */ |
| 5825 | bdrv_replace_node_common(top, base, false, false, &local_err); |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5826 | if (local_err) { |
| 5827 | error_report_err(local_err); |
| 5828 | goto exit; |
| 5829 | } |
| 5830 | |
| 5831 | for (p = updated_children; p; p = p->next) { |
| 5832 | c = p->data; |
| 5833 | |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 5834 | if (c->klass->update_filename) { |
| 5835 | ret = c->klass->update_filename(c, base, backing_file_str, |
| 5836 | &local_err); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 5837 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | d669ed6 | 2020-11-06 15:42:37 +0300 | [diff] [blame] | 5838 | /* |
| 5839 | * TODO: Actually, we want to rollback all previous iterations |
| 5840 | * of this loop, and (which is almost impossible) previous |
| 5841 | * bdrv_replace_node()... |
| 5842 | * |
| 5843 | * Note, that c->klass->update_filename may lead to permission |
| 5844 | * update, so it's a bad idea to call it inside permission |
| 5845 | * update transaction of bdrv_replace_node. |
| 5846 | */ |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 5847 | error_report_err(local_err); |
| 5848 | goto exit; |
| 5849 | } |
| 5850 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 5851 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5852 | |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 5853 | if (update_inherits_from) { |
| 5854 | base->inherits_from = explicit_top->inherits_from; |
| 5855 | } |
| 5856 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5857 | ret = 0; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5858 | exit: |
Kevin Wolf | 631086d | 2022-11-18 18:41:03 +0100 | [diff] [blame] | 5859 | bdrv_drained_end(base); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 5860 | bdrv_unref(top); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 5861 | return ret; |
| 5862 | } |
| 5863 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 5864 | /** |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5865 | * Implementation of BlockDriver.bdrv_co_get_allocated_file_size() that |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5866 | * sums the size of all data-bearing children. (This excludes backing |
| 5867 | * children.) |
| 5868 | */ |
Emanuele Giuseppe Esposito | de33563 | 2023-05-04 13:57:43 +0200 | [diff] [blame] | 5869 | static int64_t coroutine_fn GRAPH_RDLOCK |
| 5870 | bdrv_sum_allocated_file_size(BlockDriverState *bs) |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5871 | { |
| 5872 | BdrvChild *child; |
| 5873 | int64_t child_size, sum = 0; |
| 5874 | |
| 5875 | QLIST_FOREACH(child, &bs->children, next) { |
| 5876 | if (child->role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA | |
| 5877 | BDRV_CHILD_FILTERED)) |
| 5878 | { |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5879 | child_size = bdrv_co_get_allocated_file_size(child->bs); |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5880 | if (child_size < 0) { |
| 5881 | return child_size; |
| 5882 | } |
| 5883 | sum += child_size; |
| 5884 | } |
| 5885 | } |
| 5886 | |
| 5887 | return sum; |
| 5888 | } |
| 5889 | |
| 5890 | /** |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5891 | * Length of a allocated file in bytes. Sparse files are counted by actual |
| 5892 | * allocated space. Return < 0 if error or unknown. |
| 5893 | */ |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5894 | int64_t coroutine_fn bdrv_co_get_allocated_file_size(BlockDriverState *bs) |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5895 | { |
| 5896 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 5897 | IO_CODE(); |
Emanuele Giuseppe Esposito | de33563 | 2023-05-04 13:57:43 +0200 | [diff] [blame] | 5898 | assert_bdrv_graph_readable(); |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 5899 | |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5900 | if (!drv) { |
| 5901 | return -ENOMEDIUM; |
| 5902 | } |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5903 | if (drv->bdrv_co_get_allocated_file_size) { |
| 5904 | return drv->bdrv_co_get_allocated_file_size(bs); |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5905 | } |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5906 | |
| 5907 | if (drv->bdrv_file_open) { |
| 5908 | /* |
| 5909 | * Protocol drivers default to -ENOTSUP (most of their data is |
| 5910 | * not stored in any of their children (if they even have any), |
| 5911 | * so there is no generic way to figure it out). |
| 5912 | */ |
| 5913 | return -ENOTSUP; |
| 5914 | } else if (drv->is_filter) { |
| 5915 | /* Filter drivers default to the size of their filtered child */ |
Emanuele Giuseppe Esposito | 82618d7 | 2023-01-13 21:42:07 +0100 | [diff] [blame] | 5916 | return bdrv_co_get_allocated_file_size(bdrv_filter_bs(bs)); |
Max Reitz | 081e465 | 2019-06-12 18:14:13 +0200 | [diff] [blame] | 5917 | } else { |
| 5918 | /* Other drivers default to summing their children's sizes */ |
| 5919 | return bdrv_sum_allocated_file_size(bs); |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5920 | } |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5921 | } |
| 5922 | |
Stefan Hajnoczi | 90880ff | 2017-07-05 13:57:30 +0100 | [diff] [blame] | 5923 | /* |
| 5924 | * bdrv_measure: |
| 5925 | * @drv: Format driver |
| 5926 | * @opts: Creation options for new image |
| 5927 | * @in_bs: Existing image containing data for new image (may be NULL) |
| 5928 | * @errp: Error object |
| 5929 | * Returns: A #BlockMeasureInfo (free using qapi_free_BlockMeasureInfo()) |
| 5930 | * or NULL on error |
| 5931 | * |
| 5932 | * Calculate file size required to create a new image. |
| 5933 | * |
| 5934 | * If @in_bs is given then space for allocated clusters and zero clusters |
| 5935 | * from that image are included in the calculation. If @opts contains a |
| 5936 | * backing file that is shared by @in_bs then backing clusters may be omitted |
| 5937 | * from the calculation. |
| 5938 | * |
| 5939 | * If @in_bs is NULL then the calculation includes no allocated clusters |
| 5940 | * unless a preallocation option is given in @opts. |
| 5941 | * |
| 5942 | * Note that @in_bs may use a different BlockDriver from @drv. |
| 5943 | * |
| 5944 | * If an error occurs the @errp pointer is set. |
| 5945 | */ |
| 5946 | BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts, |
| 5947 | BlockDriverState *in_bs, Error **errp) |
| 5948 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 5949 | IO_CODE(); |
Stefan Hajnoczi | 90880ff | 2017-07-05 13:57:30 +0100 | [diff] [blame] | 5950 | if (!drv->bdrv_measure) { |
| 5951 | error_setg(errp, "Block driver '%s' does not support size measurement", |
| 5952 | drv->format_name); |
| 5953 | return NULL; |
| 5954 | } |
| 5955 | |
| 5956 | return drv->bdrv_measure(opts, in_bs, errp); |
| 5957 | } |
| 5958 | |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 5959 | /** |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 5960 | * Return number of sectors on success, -errno on error. |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 5961 | */ |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 5962 | int64_t coroutine_fn bdrv_co_nb_sectors(BlockDriverState *bs) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 5963 | { |
| 5964 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 5965 | IO_CODE(); |
Kevin Wolf | 8ab8140 | 2023-02-03 16:22:02 +0100 | [diff] [blame] | 5966 | assert_bdrv_graph_readable(); |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 5967 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 5968 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5969 | return -ENOMEDIUM; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 5970 | |
Paolo Bonzini | 160a29e | 2023-04-07 17:32:56 +0200 | [diff] [blame] | 5971 | if (bs->bl.has_variable_length) { |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 5972 | int ret = bdrv_co_refresh_total_sectors(bs, bs->total_sectors); |
Kevin Wolf | b94a261 | 2013-10-29 12:18:58 +0100 | [diff] [blame] | 5973 | if (ret < 0) { |
| 5974 | return ret; |
Stefan Hajnoczi | 46a4e4e | 2011-03-29 20:04:41 +0100 | [diff] [blame] | 5975 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 5976 | } |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 5977 | return bs->total_sectors; |
| 5978 | } |
| 5979 | |
Paolo Bonzini | 81f730d | 2023-04-07 17:33:03 +0200 | [diff] [blame] | 5980 | /* |
| 5981 | * This wrapper is written by hand because this function is in the hot I/O path, |
| 5982 | * via blk_get_geometry. |
| 5983 | */ |
| 5984 | int64_t coroutine_mixed_fn bdrv_nb_sectors(BlockDriverState *bs) |
| 5985 | { |
| 5986 | BlockDriver *drv = bs->drv; |
| 5987 | IO_CODE(); |
| 5988 | |
| 5989 | if (!drv) |
| 5990 | return -ENOMEDIUM; |
| 5991 | |
| 5992 | if (bs->bl.has_variable_length) { |
| 5993 | int ret = bdrv_refresh_total_sectors(bs, bs->total_sectors); |
| 5994 | if (ret < 0) { |
| 5995 | return ret; |
| 5996 | } |
| 5997 | } |
| 5998 | |
| 5999 | return bs->total_sectors; |
| 6000 | } |
| 6001 | |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6002 | /** |
| 6003 | * Return length in bytes on success, -errno on error. |
| 6004 | * The length is always a multiple of BDRV_SECTOR_SIZE. |
| 6005 | */ |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6006 | int64_t coroutine_fn bdrv_co_getlength(BlockDriverState *bs) |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6007 | { |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6008 | int64_t ret; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6009 | IO_CODE(); |
Kevin Wolf | 8ab8140 | 2023-02-03 16:22:02 +0100 | [diff] [blame] | 6010 | assert_bdrv_graph_readable(); |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 6011 | |
Emanuele Giuseppe Esposito | c86422c | 2023-01-13 21:42:04 +0100 | [diff] [blame] | 6012 | ret = bdrv_co_nb_sectors(bs); |
Eric Blake | 122860b | 2020-11-05 09:51:22 -0600 | [diff] [blame] | 6013 | if (ret < 0) { |
| 6014 | return ret; |
| 6015 | } |
| 6016 | if (ret > INT64_MAX / BDRV_SECTOR_SIZE) { |
| 6017 | return -EFBIG; |
| 6018 | } |
| 6019 | return ret * BDRV_SECTOR_SIZE; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 6020 | } |
| 6021 | |
Eric Blake | 5411541 | 2016-06-23 16:37:26 -0600 | [diff] [blame] | 6022 | bool bdrv_is_sg(BlockDriverState *bs) |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 6023 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6024 | IO_CODE(); |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 6025 | return bs->sg; |
| 6026 | } |
| 6027 | |
Max Reitz | ae23f78 | 2019-06-12 22:57:15 +0200 | [diff] [blame] | 6028 | /** |
| 6029 | * Return whether the given node supports compressed writes. |
| 6030 | */ |
| 6031 | bool bdrv_supports_compressed_writes(BlockDriverState *bs) |
| 6032 | { |
| 6033 | BlockDriverState *filtered; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6034 | IO_CODE(); |
Max Reitz | ae23f78 | 2019-06-12 22:57:15 +0200 | [diff] [blame] | 6035 | |
| 6036 | if (!bs->drv || !block_driver_can_compress(bs->drv)) { |
| 6037 | return false; |
| 6038 | } |
| 6039 | |
| 6040 | filtered = bdrv_filter_bs(bs); |
| 6041 | if (filtered) { |
| 6042 | /* |
| 6043 | * Filters can only forward compressed writes, so we have to |
| 6044 | * check the child. |
| 6045 | */ |
| 6046 | return bdrv_supports_compressed_writes(filtered); |
| 6047 | } |
| 6048 | |
| 6049 | return true; |
| 6050 | } |
| 6051 | |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 6052 | const char *bdrv_get_format_name(BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6053 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6054 | IO_CODE(); |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 6055 | return bs->drv ? bs->drv->format_name : NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6056 | } |
| 6057 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6058 | static int qsort_strcmp(const void *a, const void *b) |
| 6059 | { |
Max Reitz | ceff5bd | 2016-10-12 22:49:05 +0200 | [diff] [blame] | 6060 | return strcmp(*(char *const *)a, *(char *const *)b); |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6061 | } |
| 6062 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 6063 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 6064 | void *opaque, bool read_only) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6065 | { |
| 6066 | BlockDriver *drv; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6067 | int count = 0; |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6068 | int i; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6069 | const char **formats = NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6070 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6071 | GLOBAL_STATE_CODE(); |
| 6072 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 6073 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6074 | if (drv->format_name) { |
| 6075 | bool found = false; |
| 6076 | int i = count; |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 6077 | |
| 6078 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, read_only)) { |
| 6079 | continue; |
| 6080 | } |
| 6081 | |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6082 | while (formats && i && !found) { |
| 6083 | found = !strcmp(formats[--i], drv->format_name); |
| 6084 | } |
| 6085 | |
| 6086 | if (!found) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 6087 | formats = g_renew(const char *, formats, count + 1); |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6088 | formats[count++] = drv->format_name; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6089 | } |
| 6090 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6091 | } |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6092 | |
Max Reitz | eb0df69 | 2016-10-12 22:49:06 +0200 | [diff] [blame] | 6093 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); i++) { |
| 6094 | const char *format_name = block_driver_modules[i].format_name; |
| 6095 | |
| 6096 | if (format_name) { |
| 6097 | bool found = false; |
| 6098 | int j = count; |
| 6099 | |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 6100 | if (use_bdrv_whitelist && |
| 6101 | !bdrv_format_is_whitelisted(format_name, read_only)) { |
| 6102 | continue; |
| 6103 | } |
| 6104 | |
Max Reitz | eb0df69 | 2016-10-12 22:49:06 +0200 | [diff] [blame] | 6105 | while (formats && j && !found) { |
| 6106 | found = !strcmp(formats[--j], format_name); |
| 6107 | } |
| 6108 | |
| 6109 | if (!found) { |
| 6110 | formats = g_renew(const char *, formats, count + 1); |
| 6111 | formats[count++] = format_name; |
| 6112 | } |
| 6113 | } |
| 6114 | } |
| 6115 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 6116 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); |
| 6117 | |
| 6118 | for (i = 0; i < count; i++) { |
| 6119 | it(opaque, formats[i]); |
| 6120 | } |
| 6121 | |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 6122 | g_free(formats); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6123 | } |
| 6124 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 6125 | /* This function is to find a node in the bs graph */ |
| 6126 | BlockDriverState *bdrv_find_node(const char *node_name) |
| 6127 | { |
| 6128 | BlockDriverState *bs; |
| 6129 | |
| 6130 | assert(node_name); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6131 | GLOBAL_STATE_CODE(); |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 6132 | |
| 6133 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 6134 | if (!strcmp(node_name, bs->node_name)) { |
| 6135 | return bs; |
| 6136 | } |
| 6137 | } |
| 6138 | return NULL; |
| 6139 | } |
| 6140 | |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6141 | /* 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] | 6142 | BlockDeviceInfoList *bdrv_named_nodes_list(bool flat, |
| 6143 | Error **errp) |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6144 | { |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6145 | BlockDeviceInfoList *list; |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6146 | BlockDriverState *bs; |
| 6147 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6148 | GLOBAL_STATE_CODE(); |
| 6149 | |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6150 | list = NULL; |
| 6151 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
Peter Krempa | facda54 | 2020-01-20 09:50:49 +0100 | [diff] [blame] | 6152 | BlockDeviceInfo *info = bdrv_block_device_info(NULL, bs, flat, errp); |
Alberto Garcia | d5a8ee6 | 2015-04-17 14:52:43 +0300 | [diff] [blame] | 6153 | if (!info) { |
| 6154 | qapi_free_BlockDeviceInfoList(list); |
| 6155 | return NULL; |
| 6156 | } |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6157 | QAPI_LIST_PREPEND(list, info); |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 6158 | } |
| 6159 | |
| 6160 | return list; |
| 6161 | } |
| 6162 | |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6163 | typedef struct XDbgBlockGraphConstructor { |
| 6164 | XDbgBlockGraph *graph; |
| 6165 | GHashTable *graph_nodes; |
| 6166 | } XDbgBlockGraphConstructor; |
| 6167 | |
| 6168 | static XDbgBlockGraphConstructor *xdbg_graph_new(void) |
| 6169 | { |
| 6170 | XDbgBlockGraphConstructor *gr = g_new(XDbgBlockGraphConstructor, 1); |
| 6171 | |
| 6172 | gr->graph = g_new0(XDbgBlockGraph, 1); |
| 6173 | gr->graph_nodes = g_hash_table_new(NULL, NULL); |
| 6174 | |
| 6175 | return gr; |
| 6176 | } |
| 6177 | |
| 6178 | static XDbgBlockGraph *xdbg_graph_finalize(XDbgBlockGraphConstructor *gr) |
| 6179 | { |
| 6180 | XDbgBlockGraph *graph = gr->graph; |
| 6181 | |
| 6182 | g_hash_table_destroy(gr->graph_nodes); |
| 6183 | g_free(gr); |
| 6184 | |
| 6185 | return graph; |
| 6186 | } |
| 6187 | |
| 6188 | static uintptr_t xdbg_graph_node_num(XDbgBlockGraphConstructor *gr, void *node) |
| 6189 | { |
| 6190 | uintptr_t ret = (uintptr_t)g_hash_table_lookup(gr->graph_nodes, node); |
| 6191 | |
| 6192 | if (ret != 0) { |
| 6193 | return ret; |
| 6194 | } |
| 6195 | |
| 6196 | /* |
| 6197 | * Start counting from 1, not 0, because 0 interferes with not-found (NULL) |
| 6198 | * answer of g_hash_table_lookup. |
| 6199 | */ |
| 6200 | ret = g_hash_table_size(gr->graph_nodes) + 1; |
| 6201 | g_hash_table_insert(gr->graph_nodes, node, (void *)ret); |
| 6202 | |
| 6203 | return ret; |
| 6204 | } |
| 6205 | |
| 6206 | static void xdbg_graph_add_node(XDbgBlockGraphConstructor *gr, void *node, |
| 6207 | XDbgBlockGraphNodeType type, const char *name) |
| 6208 | { |
| 6209 | XDbgBlockGraphNode *n; |
| 6210 | |
| 6211 | n = g_new0(XDbgBlockGraphNode, 1); |
| 6212 | |
| 6213 | n->id = xdbg_graph_node_num(gr, node); |
| 6214 | n->type = type; |
| 6215 | n->name = g_strdup(name); |
| 6216 | |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6217 | QAPI_LIST_PREPEND(gr->graph->nodes, n); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6218 | } |
| 6219 | |
| 6220 | static void xdbg_graph_add_edge(XDbgBlockGraphConstructor *gr, void *parent, |
| 6221 | const BdrvChild *child) |
| 6222 | { |
Max Reitz | cdb1cec | 2019-11-08 13:34:52 +0100 | [diff] [blame] | 6223 | BlockPermission qapi_perm; |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6224 | XDbgBlockGraphEdge *edge; |
Emanuele Giuseppe Esposito | 862fded | 2022-03-03 10:15:55 -0500 | [diff] [blame] | 6225 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6226 | |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6227 | edge = g_new0(XDbgBlockGraphEdge, 1); |
| 6228 | |
| 6229 | edge->parent = xdbg_graph_node_num(gr, parent); |
| 6230 | edge->child = xdbg_graph_node_num(gr, child->bs); |
| 6231 | edge->name = g_strdup(child->name); |
| 6232 | |
Max Reitz | cdb1cec | 2019-11-08 13:34:52 +0100 | [diff] [blame] | 6233 | for (qapi_perm = 0; qapi_perm < BLOCK_PERMISSION__MAX; qapi_perm++) { |
| 6234 | uint64_t flag = bdrv_qapi_perm_to_blk_perm(qapi_perm); |
| 6235 | |
| 6236 | if (flag & child->perm) { |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6237 | QAPI_LIST_PREPEND(edge->perm, qapi_perm); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6238 | } |
Max Reitz | cdb1cec | 2019-11-08 13:34:52 +0100 | [diff] [blame] | 6239 | if (flag & child->shared_perm) { |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6240 | QAPI_LIST_PREPEND(edge->shared_perm, qapi_perm); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6241 | } |
| 6242 | } |
| 6243 | |
Eric Blake | 9812e71 | 2020-10-27 00:05:47 -0500 | [diff] [blame] | 6244 | QAPI_LIST_PREPEND(gr->graph->edges, edge); |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6245 | } |
| 6246 | |
| 6247 | |
| 6248 | XDbgBlockGraph *bdrv_get_xdbg_block_graph(Error **errp) |
| 6249 | { |
| 6250 | BlockBackend *blk; |
| 6251 | BlockJob *job; |
| 6252 | BlockDriverState *bs; |
| 6253 | BdrvChild *child; |
| 6254 | XDbgBlockGraphConstructor *gr = xdbg_graph_new(); |
| 6255 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6256 | GLOBAL_STATE_CODE(); |
| 6257 | |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6258 | for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) { |
| 6259 | char *allocated_name = NULL; |
| 6260 | const char *name = blk_name(blk); |
| 6261 | |
| 6262 | if (!*name) { |
| 6263 | name = allocated_name = blk_get_attached_dev_id(blk); |
| 6264 | } |
| 6265 | xdbg_graph_add_node(gr, blk, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_BACKEND, |
| 6266 | name); |
| 6267 | g_free(allocated_name); |
| 6268 | if (blk_root(blk)) { |
| 6269 | xdbg_graph_add_edge(gr, blk, blk_root(blk)); |
| 6270 | } |
| 6271 | } |
| 6272 | |
Emanuele Giuseppe Esposito | 880eeec | 2022-09-26 05:32:04 -0400 | [diff] [blame] | 6273 | WITH_JOB_LOCK_GUARD() { |
| 6274 | for (job = block_job_next_locked(NULL); job; |
| 6275 | job = block_job_next_locked(job)) { |
| 6276 | GSList *el; |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6277 | |
Emanuele Giuseppe Esposito | 880eeec | 2022-09-26 05:32:04 -0400 | [diff] [blame] | 6278 | xdbg_graph_add_node(gr, job, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_JOB, |
| 6279 | job->job.id); |
| 6280 | for (el = job->nodes; el; el = el->next) { |
| 6281 | xdbg_graph_add_edge(gr, job, (BdrvChild *)el->data); |
| 6282 | } |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 6283 | } |
| 6284 | } |
| 6285 | |
| 6286 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 6287 | xdbg_graph_add_node(gr, bs, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_DRIVER, |
| 6288 | bs->node_name); |
| 6289 | QLIST_FOREACH(child, &bs->children, next) { |
| 6290 | xdbg_graph_add_edge(gr, bs, child); |
| 6291 | } |
| 6292 | } |
| 6293 | |
| 6294 | return xdbg_graph_finalize(gr); |
| 6295 | } |
| 6296 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6297 | BlockDriverState *bdrv_lookup_bs(const char *device, |
| 6298 | const char *node_name, |
| 6299 | Error **errp) |
| 6300 | { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 6301 | BlockBackend *blk; |
| 6302 | BlockDriverState *bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6303 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6304 | GLOBAL_STATE_CODE(); |
| 6305 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6306 | if (device) { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 6307 | blk = blk_by_name(device); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6308 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 6309 | if (blk) { |
Alberto Garcia | 9f4ed6f | 2015-10-26 16:46:49 +0200 | [diff] [blame] | 6310 | bs = blk_bs(blk); |
| 6311 | if (!bs) { |
Max Reitz | 5433c24 | 2015-10-19 17:53:29 +0200 | [diff] [blame] | 6312 | error_setg(errp, "Device '%s' has no medium", device); |
Max Reitz | 5433c24 | 2015-10-19 17:53:29 +0200 | [diff] [blame] | 6313 | } |
| 6314 | |
Alberto Garcia | 9f4ed6f | 2015-10-26 16:46:49 +0200 | [diff] [blame] | 6315 | return bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6316 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6317 | } |
| 6318 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 6319 | if (node_name) { |
| 6320 | bs = bdrv_find_node(node_name); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6321 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 6322 | if (bs) { |
| 6323 | return bs; |
| 6324 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6325 | } |
| 6326 | |
Connor Kuehl | 785ec4b | 2021-03-05 09:19:28 -0600 | [diff] [blame] | 6327 | error_setg(errp, "Cannot find device=\'%s\' nor node-name=\'%s\'", |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 6328 | device ? device : "", |
| 6329 | node_name ? node_name : ""); |
| 6330 | return NULL; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 6331 | } |
| 6332 | |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 6333 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
| 6334 | * return false. If either argument is NULL, return false. */ |
| 6335 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) |
| 6336 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6337 | |
| 6338 | GLOBAL_STATE_CODE(); |
| 6339 | |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 6340 | while (top && top != base) { |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6341 | top = bdrv_filter_or_cow_bs(top); |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 6342 | } |
| 6343 | |
| 6344 | return top != NULL; |
| 6345 | } |
| 6346 | |
Fam Zheng | 04df765 | 2014-10-31 11:32:54 +0800 | [diff] [blame] | 6347 | BlockDriverState *bdrv_next_node(BlockDriverState *bs) |
| 6348 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6349 | GLOBAL_STATE_CODE(); |
Fam Zheng | 04df765 | 2014-10-31 11:32:54 +0800 | [diff] [blame] | 6350 | if (!bs) { |
| 6351 | return QTAILQ_FIRST(&graph_bdrv_states); |
| 6352 | } |
| 6353 | return QTAILQ_NEXT(bs, node_list); |
| 6354 | } |
| 6355 | |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 6356 | BlockDriverState *bdrv_next_all_states(BlockDriverState *bs) |
| 6357 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6358 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 6359 | if (!bs) { |
| 6360 | return QTAILQ_FIRST(&all_bdrv_states); |
| 6361 | } |
| 6362 | return QTAILQ_NEXT(bs, bs_list); |
| 6363 | } |
| 6364 | |
Fam Zheng | 20a9e77 | 2014-10-31 11:32:55 +0800 | [diff] [blame] | 6365 | const char *bdrv_get_node_name(const BlockDriverState *bs) |
| 6366 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6367 | IO_CODE(); |
Fam Zheng | 20a9e77 | 2014-10-31 11:32:55 +0800 | [diff] [blame] | 6368 | return bs->node_name; |
| 6369 | } |
| 6370 | |
Kevin Wolf | 1f0c461 | 2016-03-22 18:38:44 +0100 | [diff] [blame] | 6371 | const char *bdrv_get_parent_name(const BlockDriverState *bs) |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6372 | { |
| 6373 | BdrvChild *c; |
| 6374 | const char *name; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 6375 | IO_CODE(); |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6376 | |
| 6377 | /* If multiple parents have a name, just pick the first one. */ |
| 6378 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 6379 | if (c->klass->get_name) { |
| 6380 | name = c->klass->get_name(c); |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6381 | if (name && *name) { |
| 6382 | return name; |
| 6383 | } |
| 6384 | } |
| 6385 | } |
| 6386 | |
| 6387 | return NULL; |
| 6388 | } |
| 6389 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 6390 | /* TODO check what callers really want: bs->node_name or blk_name() */ |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 6391 | const char *bdrv_get_device_name(const BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6392 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6393 | IO_CODE(); |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6394 | return bdrv_get_parent_name(bs) ?: ""; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6395 | } |
| 6396 | |
Alberto Garcia | 9b2aa84 | 2015-04-08 12:29:18 +0300 | [diff] [blame] | 6397 | /* This can be used to identify nodes that might not have a device |
| 6398 | * name associated. Since node and device names live in the same |
| 6399 | * namespace, the result is unambiguous. The exception is if both are |
| 6400 | * absent, then this returns an empty (non-null) string. */ |
| 6401 | const char *bdrv_get_device_or_node_name(const BlockDriverState *bs) |
| 6402 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6403 | IO_CODE(); |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 6404 | return bdrv_get_parent_name(bs) ?: bs->node_name; |
Alberto Garcia | 9b2aa84 | 2015-04-08 12:29:18 +0300 | [diff] [blame] | 6405 | } |
| 6406 | |
Markus Armbruster | c843328 | 2012-06-05 16:49:24 +0200 | [diff] [blame] | 6407 | int bdrv_get_flags(BlockDriverState *bs) |
| 6408 | { |
Hanna Reitz | 15aee7a | 2022-04-27 13:40:54 +0200 | [diff] [blame] | 6409 | IO_CODE(); |
Markus Armbruster | c843328 | 2012-06-05 16:49:24 +0200 | [diff] [blame] | 6410 | return bs->open_flags; |
| 6411 | } |
| 6412 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 6413 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
| 6414 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6415 | GLOBAL_STATE_CODE(); |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 6416 | return 1; |
| 6417 | } |
| 6418 | |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6419 | int bdrv_has_zero_init(BlockDriverState *bs) |
| 6420 | { |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 6421 | BlockDriverState *filtered; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6422 | GLOBAL_STATE_CODE(); |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 6423 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 6424 | if (!bs->drv) { |
| 6425 | return 0; |
| 6426 | } |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6427 | |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 6428 | /* If BS is a copy on write image, it is initialized to |
| 6429 | the contents of the base image, which may not be zeroes. */ |
Max Reitz | 3477817 | 2019-06-12 17:10:46 +0200 | [diff] [blame] | 6430 | if (bdrv_cow_child(bs)) { |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 6431 | return 0; |
| 6432 | } |
Kevin Wolf | 336c1c1 | 2010-07-28 11:26:29 +0200 | [diff] [blame] | 6433 | if (bs->drv->bdrv_has_zero_init) { |
| 6434 | return bs->drv->bdrv_has_zero_init(bs); |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6435 | } |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 6436 | |
| 6437 | filtered = bdrv_filter_bs(bs); |
| 6438 | if (filtered) { |
| 6439 | return bdrv_has_zero_init(filtered); |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6440 | } |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6441 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 6442 | /* safe default */ |
| 6443 | return 0; |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 6444 | } |
| 6445 | |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 6446 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) |
| 6447 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6448 | IO_CODE(); |
Denis V. Lunev | 2f0342e | 2016-07-14 16:33:26 +0300 | [diff] [blame] | 6449 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 6450 | return false; |
| 6451 | } |
| 6452 | |
Eric Blake | e24d813 | 2018-01-26 13:34:39 -0600 | [diff] [blame] | 6453 | return bs->supported_zero_flags & BDRV_REQ_MAY_UNMAP; |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 6454 | } |
| 6455 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 6456 | void bdrv_get_backing_filename(BlockDriverState *bs, |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 6457 | char *filename, int filename_size) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6458 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6459 | IO_CODE(); |
Kevin Wolf | 3574c60 | 2011-10-26 11:02:11 +0200 | [diff] [blame] | 6460 | pstrcpy(filename, filename_size, bs->backing_file); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6461 | } |
| 6462 | |
Emanuele Giuseppe Esposito | 3d47eb0 | 2023-01-13 21:42:08 +0100 | [diff] [blame] | 6463 | int coroutine_fn bdrv_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6464 | { |
Vladimir Sementsov-Ogievskiy | 8b11700 | 2020-12-04 01:27:13 +0300 | [diff] [blame] | 6465 | int ret; |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6466 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6467 | IO_CODE(); |
Emanuele Giuseppe Esposito | a00e70c | 2023-05-04 13:57:44 +0200 | [diff] [blame] | 6468 | assert_bdrv_graph_readable(); |
| 6469 | |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6470 | /* if bs->drv == NULL, bs is closed, so there's nothing to do here */ |
| 6471 | if (!drv) { |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6472 | return -ENOMEDIUM; |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6473 | } |
Emanuele Giuseppe Esposito | 3d47eb0 | 2023-01-13 21:42:08 +0100 | [diff] [blame] | 6474 | if (!drv->bdrv_co_get_info) { |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 6475 | BlockDriverState *filtered = bdrv_filter_bs(bs); |
| 6476 | if (filtered) { |
Emanuele Giuseppe Esposito | 3d47eb0 | 2023-01-13 21:42:08 +0100 | [diff] [blame] | 6477 | return bdrv_co_get_info(filtered, bdi); |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6478 | } |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6479 | return -ENOTSUP; |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 6480 | } |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6481 | memset(bdi, 0, sizeof(*bdi)); |
Emanuele Giuseppe Esposito | 3d47eb0 | 2023-01-13 21:42:08 +0100 | [diff] [blame] | 6482 | ret = drv->bdrv_co_get_info(bs, bdi); |
Vladimir Sementsov-Ogievskiy | 8b11700 | 2020-12-04 01:27:13 +0300 | [diff] [blame] | 6483 | if (ret < 0) { |
| 6484 | return ret; |
| 6485 | } |
| 6486 | |
| 6487 | if (bdi->cluster_size > BDRV_MAX_ALIGNMENT) { |
| 6488 | return -EINVAL; |
| 6489 | } |
| 6490 | |
| 6491 | return 0; |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 6492 | } |
| 6493 | |
Andrey Shinkevich | 1bf6e9c | 2019-02-08 18:06:06 +0300 | [diff] [blame] | 6494 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs, |
| 6495 | Error **errp) |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 6496 | { |
| 6497 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6498 | IO_CODE(); |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 6499 | if (drv && drv->bdrv_get_specific_info) { |
Andrey Shinkevich | 1bf6e9c | 2019-02-08 18:06:06 +0300 | [diff] [blame] | 6500 | return drv->bdrv_get_specific_info(bs, errp); |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 6501 | } |
| 6502 | return NULL; |
| 6503 | } |
| 6504 | |
Anton Nefedov | d924559 | 2019-09-23 15:17:37 +0300 | [diff] [blame] | 6505 | BlockStatsSpecific *bdrv_get_specific_stats(BlockDriverState *bs) |
| 6506 | { |
| 6507 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6508 | IO_CODE(); |
Anton Nefedov | d924559 | 2019-09-23 15:17:37 +0300 | [diff] [blame] | 6509 | if (!drv || !drv->bdrv_get_specific_stats) { |
| 6510 | return NULL; |
| 6511 | } |
| 6512 | return drv->bdrv_get_specific_stats(bs); |
| 6513 | } |
| 6514 | |
Emanuele Giuseppe Esposito | c834dc0 | 2023-01-13 21:42:11 +0100 | [diff] [blame] | 6515 | void coroutine_fn bdrv_co_debug_event(BlockDriverState *bs, BlkdebugEvent event) |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 6516 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6517 | IO_CODE(); |
Emanuele Giuseppe Esposito | cb2bfaa | 2023-05-04 13:57:45 +0200 | [diff] [blame] | 6518 | assert_bdrv_graph_readable(); |
| 6519 | |
Emanuele Giuseppe Esposito | c834dc0 | 2023-01-13 21:42:11 +0100 | [diff] [blame] | 6520 | if (!bs || !bs->drv || !bs->drv->bdrv_co_debug_event) { |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 6521 | return; |
| 6522 | } |
| 6523 | |
Emanuele Giuseppe Esposito | c834dc0 | 2023-01-13 21:42:11 +0100 | [diff] [blame] | 6524 | bs->drv->bdrv_co_debug_event(bs, event); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6525 | } |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 6526 | |
Vladimir Sementsov-Ogievskiy | d10529a | 2019-09-20 17:20:49 +0300 | [diff] [blame] | 6527 | static BlockDriverState *bdrv_find_debug_node(BlockDriverState *bs) |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6528 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 6529 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6530 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { |
Max Reitz | f706a92 | 2019-06-12 17:42:13 +0200 | [diff] [blame] | 6531 | bs = bdrv_primary_bs(bs); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6532 | } |
| 6533 | |
| 6534 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { |
Vladimir Sementsov-Ogievskiy | d10529a | 2019-09-20 17:20:49 +0300 | [diff] [blame] | 6535 | assert(bs->drv->bdrv_debug_remove_breakpoint); |
| 6536 | return bs; |
| 6537 | } |
| 6538 | |
| 6539 | return NULL; |
| 6540 | } |
| 6541 | |
| 6542 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
| 6543 | const char *tag) |
| 6544 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6545 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | d10529a | 2019-09-20 17:20:49 +0300 | [diff] [blame] | 6546 | bs = bdrv_find_debug_node(bs); |
| 6547 | if (bs) { |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6548 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); |
| 6549 | } |
| 6550 | |
| 6551 | return -ENOTSUP; |
| 6552 | } |
| 6553 | |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 6554 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
| 6555 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6556 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | d10529a | 2019-09-20 17:20:49 +0300 | [diff] [blame] | 6557 | bs = bdrv_find_debug_node(bs); |
| 6558 | if (bs) { |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 6559 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); |
| 6560 | } |
| 6561 | |
| 6562 | return -ENOTSUP; |
| 6563 | } |
| 6564 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6565 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
| 6566 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6567 | GLOBAL_STATE_CODE(); |
Max Reitz | 938789e | 2014-03-10 23:44:08 +0100 | [diff] [blame] | 6568 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
Max Reitz | f706a92 | 2019-06-12 17:42:13 +0200 | [diff] [blame] | 6569 | bs = bdrv_primary_bs(bs); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6570 | } |
| 6571 | |
| 6572 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
| 6573 | return bs->drv->bdrv_debug_resume(bs, tag); |
| 6574 | } |
| 6575 | |
| 6576 | return -ENOTSUP; |
| 6577 | } |
| 6578 | |
| 6579 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) |
| 6580 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6581 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6582 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { |
Max Reitz | f706a92 | 2019-06-12 17:42:13 +0200 | [diff] [blame] | 6583 | bs = bdrv_primary_bs(bs); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 6584 | } |
| 6585 | |
| 6586 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { |
| 6587 | return bs->drv->bdrv_debug_is_suspended(bs, tag); |
| 6588 | } |
| 6589 | |
| 6590 | return false; |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 6591 | } |
| 6592 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6593 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
| 6594 | * relative, it must be relative to the chain. So, passing in bs->filename |
| 6595 | * from a BDS as backing_file should not be done, as that may be relative to |
| 6596 | * the CWD rather than the chain. */ |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6597 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
| 6598 | const char *backing_file) |
| 6599 | { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6600 | char *filename_full = NULL; |
| 6601 | char *backing_file_full = NULL; |
| 6602 | char *filename_tmp = NULL; |
| 6603 | int is_protocol = 0; |
Max Reitz | 0b877d0 | 2018-08-01 20:34:11 +0200 | [diff] [blame] | 6604 | bool filenames_refreshed = false; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6605 | BlockDriverState *curr_bs = NULL; |
| 6606 | BlockDriverState *retval = NULL; |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6607 | BlockDriverState *bs_below; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6608 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6609 | GLOBAL_STATE_CODE(); |
| 6610 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6611 | if (!bs || !bs->drv || !backing_file) { |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6612 | return NULL; |
| 6613 | } |
| 6614 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6615 | filename_full = g_malloc(PATH_MAX); |
| 6616 | backing_file_full = g_malloc(PATH_MAX); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6617 | |
| 6618 | is_protocol = path_has_protocol(backing_file); |
| 6619 | |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6620 | /* |
| 6621 | * Being largely a legacy function, skip any filters here |
| 6622 | * (because filters do not have normal filenames, so they cannot |
| 6623 | * match anyway; and allowing json:{} filenames is a bit out of |
| 6624 | * scope). |
| 6625 | */ |
| 6626 | for (curr_bs = bdrv_skip_filters(bs); |
| 6627 | bdrv_cow_child(curr_bs) != NULL; |
| 6628 | curr_bs = bs_below) |
| 6629 | { |
| 6630 | bs_below = bdrv_backing_chain_next(curr_bs); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6631 | |
Max Reitz | 0b877d0 | 2018-08-01 20:34:11 +0200 | [diff] [blame] | 6632 | if (bdrv_backing_overridden(curr_bs)) { |
| 6633 | /* |
| 6634 | * If the backing file was overridden, we can only compare |
| 6635 | * directly against the backing node's filename. |
| 6636 | */ |
| 6637 | |
| 6638 | if (!filenames_refreshed) { |
| 6639 | /* |
| 6640 | * This will automatically refresh all of the |
| 6641 | * filenames in the rest of the backing chain, so we |
| 6642 | * only need to do this once. |
| 6643 | */ |
| 6644 | bdrv_refresh_filename(bs_below); |
| 6645 | filenames_refreshed = true; |
| 6646 | } |
| 6647 | |
| 6648 | if (strcmp(backing_file, bs_below->filename) == 0) { |
| 6649 | retval = bs_below; |
| 6650 | break; |
| 6651 | } |
| 6652 | } else if (is_protocol || path_has_protocol(curr_bs->backing_file)) { |
| 6653 | /* |
| 6654 | * If either of the filename paths is actually a protocol, then |
| 6655 | * compare unmodified paths; otherwise make paths relative. |
| 6656 | */ |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 6657 | char *backing_file_full_ret; |
| 6658 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6659 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6660 | retval = bs_below; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6661 | break; |
| 6662 | } |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 6663 | /* Also check against the full backing filename for the image */ |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 6664 | backing_file_full_ret = bdrv_get_full_backing_filename(curr_bs, |
| 6665 | NULL); |
| 6666 | if (backing_file_full_ret) { |
| 6667 | bool equal = strcmp(backing_file, backing_file_full_ret) == 0; |
| 6668 | g_free(backing_file_full_ret); |
| 6669 | if (equal) { |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6670 | retval = bs_below; |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 6671 | break; |
| 6672 | } |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 6673 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6674 | } else { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6675 | /* If not an absolute filename path, make it relative to the current |
| 6676 | * image's filename path */ |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 6677 | filename_tmp = bdrv_make_absolute_filename(curr_bs, backing_file, |
| 6678 | NULL); |
| 6679 | /* We are going to compare canonicalized absolute pathnames */ |
| 6680 | if (!filename_tmp || !realpath(filename_tmp, filename_full)) { |
| 6681 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6682 | continue; |
| 6683 | } |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 6684 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6685 | |
| 6686 | /* We need to make sure the backing filename we are comparing against |
| 6687 | * is relative to the current image filename (or absolute) */ |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 6688 | filename_tmp = bdrv_get_full_backing_filename(curr_bs, NULL); |
| 6689 | if (!filename_tmp || !realpath(filename_tmp, backing_file_full)) { |
| 6690 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6691 | continue; |
| 6692 | } |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 6693 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6694 | |
| 6695 | if (strcmp(backing_file_full, filename_full) == 0) { |
Max Reitz | dcf3f9b | 2019-06-12 17:34:45 +0200 | [diff] [blame] | 6696 | retval = bs_below; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6697 | break; |
| 6698 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6699 | } |
| 6700 | } |
| 6701 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6702 | g_free(filename_full); |
| 6703 | g_free(backing_file_full); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 6704 | return retval; |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 6705 | } |
| 6706 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6707 | void bdrv_init(void) |
| 6708 | { |
Kevin Wolf | e5f05f8 | 2021-07-09 18:41:41 +0200 | [diff] [blame] | 6709 | #ifdef CONFIG_BDRV_WHITELIST_TOOLS |
| 6710 | use_bdrv_whitelist = 1; |
| 6711 | #endif |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 6712 | module_call_init(MODULE_INIT_BLOCK); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 6713 | } |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 6714 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 6715 | void bdrv_init_with_whitelist(void) |
| 6716 | { |
| 6717 | use_bdrv_whitelist = 1; |
| 6718 | bdrv_init(); |
| 6719 | } |
| 6720 | |
Emanuele Giuseppe Esposito | a94750d | 2022-02-09 05:54:50 -0500 | [diff] [blame] | 6721 | int bdrv_activate(BlockDriverState *bs, Error **errp) |
| 6722 | { |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6723 | BdrvChild *child, *parent; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6724 | Error *local_err = NULL; |
| 6725 | int ret; |
Vladimir Sementsov-Ogievskiy | 9c98f14 | 2018-10-29 16:23:17 -0400 | [diff] [blame] | 6726 | BdrvDirtyBitmap *bm; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6727 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6728 | GLOBAL_STATE_CODE(); |
| 6729 | |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 6730 | if (!bs->drv) { |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6731 | return -ENOMEDIUM; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6732 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 6733 | |
Vladimir Sementsov-Ogievskiy | 16e977d | 2017-01-31 14:23:08 +0300 | [diff] [blame] | 6734 | QLIST_FOREACH(child, &bs->children, next) { |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6735 | bdrv_activate(child->bs, &local_err); |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6736 | if (local_err) { |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6737 | error_propagate(errp, local_err); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6738 | return -EINVAL; |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6739 | } |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6740 | } |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6741 | |
Kevin Wolf | dafe096 | 2017-11-16 13:00:01 +0100 | [diff] [blame] | 6742 | /* |
| 6743 | * Update permissions, they may differ for inactive nodes. |
| 6744 | * |
| 6745 | * Note that the required permissions of inactive images are always a |
| 6746 | * subset of the permissions required after activating the image. This |
| 6747 | * allows us to just get the permissions upfront without restricting |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6748 | * bdrv_co_invalidate_cache(). |
Kevin Wolf | dafe096 | 2017-11-16 13:00:01 +0100 | [diff] [blame] | 6749 | * |
| 6750 | * It also means that in error cases, we don't have to try and revert to |
| 6751 | * the old permissions (which is an operation that could fail, too). We can |
| 6752 | * just keep the extended permissions for the next time that an activation |
| 6753 | * of the image is tried. |
| 6754 | */ |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6755 | if (bs->open_flags & BDRV_O_INACTIVE) { |
| 6756 | bs->open_flags &= ~BDRV_O_INACTIVE; |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 6757 | ret = bdrv_refresh_perms(bs, NULL, errp); |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6758 | if (ret < 0) { |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6759 | bs->open_flags |= BDRV_O_INACTIVE; |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6760 | return ret; |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 6761 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 6762 | |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6763 | ret = bdrv_invalidate_cache(bs, errp); |
| 6764 | if (ret < 0) { |
| 6765 | bs->open_flags |= BDRV_O_INACTIVE; |
| 6766 | return ret; |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6767 | } |
Vladimir Sementsov-Ogievskiy | 9c98f14 | 2018-10-29 16:23:17 -0400 | [diff] [blame] | 6768 | |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6769 | FOR_EACH_DIRTY_BITMAP(bs, bm) { |
| 6770 | bdrv_dirty_bitmap_skip_store(bm, false); |
| 6771 | } |
| 6772 | |
Emanuele Giuseppe Esposito | c057960 | 2023-01-13 21:42:03 +0100 | [diff] [blame] | 6773 | ret = bdrv_refresh_total_sectors(bs, bs->total_sectors); |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6774 | if (ret < 0) { |
| 6775 | bs->open_flags |= BDRV_O_INACTIVE; |
| 6776 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6777 | return ret; |
Kevin Wolf | 7bb4941 | 2019-12-17 15:06:38 +0100 | [diff] [blame] | 6778 | } |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6779 | } |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6780 | |
| 6781 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 6782 | if (parent->klass->activate) { |
| 6783 | parent->klass->activate(parent, &local_err); |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6784 | if (local_err) { |
Kevin Wolf | 78fc3b3 | 2019-01-31 15:16:10 +0100 | [diff] [blame] | 6785 | bs->open_flags |= BDRV_O_INACTIVE; |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6786 | error_propagate(errp, local_err); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6787 | return -EINVAL; |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 6788 | } |
| 6789 | } |
| 6790 | } |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6791 | |
| 6792 | return 0; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6793 | } |
| 6794 | |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6795 | int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp) |
| 6796 | { |
| 6797 | Error *local_err = NULL; |
Emanuele Giuseppe Esposito | 1581a70 | 2022-03-03 10:16:09 -0500 | [diff] [blame] | 6798 | IO_CODE(); |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6799 | |
| 6800 | assert(!(bs->open_flags & BDRV_O_INACTIVE)); |
Kevin Wolf | 1b3ff9f | 2022-12-07 14:18:38 +0100 | [diff] [blame] | 6801 | assert_bdrv_graph_readable(); |
Emanuele Giuseppe Esposito | 11d0c9b | 2022-02-09 05:54:52 -0500 | [diff] [blame] | 6802 | |
| 6803 | if (bs->drv->bdrv_co_invalidate_cache) { |
| 6804 | bs->drv->bdrv_co_invalidate_cache(bs, &local_err); |
| 6805 | if (local_err) { |
| 6806 | error_propagate(errp, local_err); |
| 6807 | return -EINVAL; |
| 6808 | } |
| 6809 | } |
| 6810 | |
| 6811 | return 0; |
| 6812 | } |
| 6813 | |
Emanuele Giuseppe Esposito | 3b71719 | 2022-02-09 05:54:51 -0500 | [diff] [blame] | 6814 | void bdrv_activate_all(Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6815 | { |
Kevin Wolf | 7c8eece | 2016-03-22 18:58:50 +0100 | [diff] [blame] | 6816 | BlockDriverState *bs; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 6817 | BdrvNextIterator it; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6818 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6819 | GLOBAL_STATE_CODE(); |
| 6820 | |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 6821 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 6822 | AioContext *aio_context = bdrv_get_aio_context(bs); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6823 | int ret; |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 6824 | |
| 6825 | aio_context_acquire(aio_context); |
Emanuele Giuseppe Esposito | a94750d | 2022-02-09 05:54:50 -0500 | [diff] [blame] | 6826 | ret = bdrv_activate(bs, errp); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 6827 | aio_context_release(aio_context); |
Vladimir Sementsov-Ogievskiy | 5416645 | 2020-09-24 21:54:08 +0300 | [diff] [blame] | 6828 | if (ret < 0) { |
Max Reitz | 5e003f1 | 2017-11-10 18:25:45 +0100 | [diff] [blame] | 6829 | bdrv_next_cleanup(&it); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 6830 | return; |
| 6831 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 6832 | } |
| 6833 | } |
| 6834 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6835 | static bool bdrv_has_bds_parent(BlockDriverState *bs, bool only_active) |
| 6836 | { |
| 6837 | BdrvChild *parent; |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 6838 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6839 | |
| 6840 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 6841 | if (parent->klass->parent_is_bds) { |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6842 | BlockDriverState *parent_bs = parent->opaque; |
| 6843 | if (!only_active || !(parent_bs->open_flags & BDRV_O_INACTIVE)) { |
| 6844 | return true; |
| 6845 | } |
| 6846 | } |
| 6847 | } |
| 6848 | |
| 6849 | return false; |
| 6850 | } |
| 6851 | |
| 6852 | static int bdrv_inactivate_recurse(BlockDriverState *bs) |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6853 | { |
Kevin Wolf | cfa1a57 | 2017-05-04 18:52:38 +0200 | [diff] [blame] | 6854 | BdrvChild *child, *parent; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6855 | int ret; |
Vladimir Sementsov-Ogievskiy | a13de40 | 2021-09-11 15:00:27 +0300 | [diff] [blame] | 6856 | uint64_t cumulative_perms, cumulative_shared_perms; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6857 | |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 6858 | GLOBAL_STATE_CODE(); |
| 6859 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 6860 | if (!bs->drv) { |
| 6861 | return -ENOMEDIUM; |
| 6862 | } |
| 6863 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6864 | /* Make sure that we don't inactivate a child before its parent. |
| 6865 | * It will be covered by recursion from the yet active parent. */ |
| 6866 | if (bdrv_has_bds_parent(bs, true)) { |
| 6867 | return 0; |
| 6868 | } |
| 6869 | |
| 6870 | assert(!(bs->open_flags & BDRV_O_INACTIVE)); |
| 6871 | |
| 6872 | /* Inactivate this node */ |
| 6873 | if (bs->drv->bdrv_inactivate) { |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6874 | ret = bs->drv->bdrv_inactivate(bs); |
| 6875 | if (ret < 0) { |
| 6876 | return ret; |
| 6877 | } |
| 6878 | } |
| 6879 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6880 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
Max Reitz | bd86fb9 | 2020-05-13 13:05:13 +0200 | [diff] [blame] | 6881 | if (parent->klass->inactivate) { |
| 6882 | ret = parent->klass->inactivate(parent); |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6883 | if (ret < 0) { |
| 6884 | return ret; |
Kevin Wolf | cfa1a57 | 2017-05-04 18:52:38 +0200 | [diff] [blame] | 6885 | } |
| 6886 | } |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 6887 | } |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 6888 | |
Vladimir Sementsov-Ogievskiy | a13de40 | 2021-09-11 15:00:27 +0300 | [diff] [blame] | 6889 | bdrv_get_cumulative_perm(bs, &cumulative_perms, |
| 6890 | &cumulative_shared_perms); |
| 6891 | if (cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) { |
| 6892 | /* Our inactive parents still need write access. Inactivation failed. */ |
| 6893 | return -EPERM; |
| 6894 | } |
| 6895 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6896 | bs->open_flags |= BDRV_O_INACTIVE; |
| 6897 | |
Vladimir Sementsov-Ogievskiy | bb87e4d | 2020-11-06 15:42:38 +0300 | [diff] [blame] | 6898 | /* |
| 6899 | * Update permissions, they may differ for inactive nodes. |
| 6900 | * We only tried to loosen restrictions, so errors are not fatal, ignore |
| 6901 | * them. |
| 6902 | */ |
Vladimir Sementsov-Ogievskiy | f1316ed | 2022-11-07 19:35:57 +0300 | [diff] [blame] | 6903 | bdrv_refresh_perms(bs, NULL, NULL); |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6904 | |
| 6905 | /* Recursively inactivate children */ |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 6906 | QLIST_FOREACH(child, &bs->children, next) { |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6907 | ret = bdrv_inactivate_recurse(child->bs); |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 6908 | if (ret < 0) { |
| 6909 | return ret; |
| 6910 | } |
| 6911 | } |
| 6912 | |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6913 | return 0; |
| 6914 | } |
| 6915 | |
| 6916 | int bdrv_inactivate_all(void) |
| 6917 | { |
Max Reitz | 79720af | 2016-03-16 19:54:44 +0100 | [diff] [blame] | 6918 | BlockDriverState *bs = NULL; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 6919 | BdrvNextIterator it; |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 6920 | int ret = 0; |
Paolo Bonzini | bd6458e | 2017-12-07 20:13:15 +0000 | [diff] [blame] | 6921 | GSList *aio_ctxs = NULL, *ctx; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6922 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 6923 | GLOBAL_STATE_CODE(); |
| 6924 | |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 6925 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Paolo Bonzini | bd6458e | 2017-12-07 20:13:15 +0000 | [diff] [blame] | 6926 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 6927 | |
| 6928 | if (!g_slist_find(aio_ctxs, aio_context)) { |
| 6929 | aio_ctxs = g_slist_prepend(aio_ctxs, aio_context); |
| 6930 | aio_context_acquire(aio_context); |
| 6931 | } |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 6932 | } |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6933 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 6934 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
| 6935 | /* Nodes with BDS parents are covered by recursion from the last |
| 6936 | * parent that gets inactivated. Don't inactivate them a second |
| 6937 | * time if that has already happened. */ |
| 6938 | if (bdrv_has_bds_parent(bs, false)) { |
| 6939 | continue; |
| 6940 | } |
| 6941 | ret = bdrv_inactivate_recurse(bs); |
| 6942 | if (ret < 0) { |
| 6943 | bdrv_next_cleanup(&it); |
| 6944 | goto out; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6945 | } |
| 6946 | } |
| 6947 | |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 6948 | out: |
Paolo Bonzini | bd6458e | 2017-12-07 20:13:15 +0000 | [diff] [blame] | 6949 | for (ctx = aio_ctxs; ctx != NULL; ctx = ctx->next) { |
| 6950 | AioContext *aio_context = ctx->data; |
| 6951 | aio_context_release(aio_context); |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 6952 | } |
Paolo Bonzini | bd6458e | 2017-12-07 20:13:15 +0000 | [diff] [blame] | 6953 | g_slist_free(aio_ctxs); |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 6954 | |
| 6955 | return ret; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 6956 | } |
| 6957 | |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 6958 | /**************************************************************/ |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6959 | /* removable device support */ |
| 6960 | |
| 6961 | /** |
| 6962 | * Return TRUE if the media is present |
| 6963 | */ |
Emanuele Giuseppe Esposito | 1e97be9 | 2023-01-13 21:42:02 +0100 | [diff] [blame] | 6964 | bool coroutine_fn bdrv_co_is_inserted(BlockDriverState *bs) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6965 | { |
| 6966 | BlockDriver *drv = bs->drv; |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 6967 | BdrvChild *child; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6968 | IO_CODE(); |
Emanuele Giuseppe Esposito | c73ff92 | 2023-02-03 16:21:57 +0100 | [diff] [blame] | 6969 | assert_bdrv_graph_readable(); |
Markus Armbruster | a1aff5b | 2011-09-06 18:58:41 +0200 | [diff] [blame] | 6970 | |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 6971 | if (!drv) { |
| 6972 | return false; |
| 6973 | } |
Emanuele Giuseppe Esposito | 1e97be9 | 2023-01-13 21:42:02 +0100 | [diff] [blame] | 6974 | if (drv->bdrv_co_is_inserted) { |
| 6975 | return drv->bdrv_co_is_inserted(bs); |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 6976 | } |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 6977 | QLIST_FOREACH(child, &bs->children, next) { |
Emanuele Giuseppe Esposito | 1e97be9 | 2023-01-13 21:42:02 +0100 | [diff] [blame] | 6978 | if (!bdrv_co_is_inserted(child->bs)) { |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 6979 | return false; |
| 6980 | } |
| 6981 | } |
| 6982 | return true; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6983 | } |
| 6984 | |
| 6985 | /** |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6986 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray |
| 6987 | */ |
Emanuele Giuseppe Esposito | 2531b39 | 2023-01-13 21:42:09 +0100 | [diff] [blame] | 6988 | void coroutine_fn bdrv_co_eject(BlockDriverState *bs, bool eject_flag) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6989 | { |
| 6990 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 6991 | IO_CODE(); |
Kevin Wolf | 79a292e | 2023-02-03 16:21:58 +0100 | [diff] [blame] | 6992 | assert_bdrv_graph_readable(); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6993 | |
Emanuele Giuseppe Esposito | 2531b39 | 2023-01-13 21:42:09 +0100 | [diff] [blame] | 6994 | if (drv && drv->bdrv_co_eject) { |
| 6995 | drv->bdrv_co_eject(bs, eject_flag); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6996 | } |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6997 | } |
| 6998 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 6999 | /** |
| 7000 | * Lock or unlock the media (if it is locked, the user won't be able |
| 7001 | * to eject it manually). |
| 7002 | */ |
Emanuele Giuseppe Esposito | 2c75261 | 2023-01-13 21:42:10 +0100 | [diff] [blame] | 7003 | void coroutine_fn bdrv_co_lock_medium(BlockDriverState *bs, bool locked) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7004 | { |
| 7005 | BlockDriver *drv = bs->drv; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7006 | IO_CODE(); |
Kevin Wolf | 79a292e | 2023-02-03 16:21:58 +0100 | [diff] [blame] | 7007 | assert_bdrv_graph_readable(); |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 7008 | trace_bdrv_lock_medium(bs, locked); |
Stefan Hajnoczi | b8c6d09 | 2011-03-29 20:04:40 +0100 | [diff] [blame] | 7009 | |
Emanuele Giuseppe Esposito | 2c75261 | 2023-01-13 21:42:10 +0100 | [diff] [blame] | 7010 | if (drv && drv->bdrv_co_lock_medium) { |
| 7011 | drv->bdrv_co_lock_medium(bs, locked); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 7012 | } |
| 7013 | } |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 7014 | |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 7015 | /* Get a reference to bs */ |
| 7016 | void bdrv_ref(BlockDriverState *bs) |
| 7017 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7018 | GLOBAL_STATE_CODE(); |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 7019 | bs->refcnt++; |
| 7020 | } |
| 7021 | |
| 7022 | /* Release a previously grabbed reference to bs. |
| 7023 | * If after releasing, reference count is zero, the BlockDriverState is |
| 7024 | * deleted. */ |
| 7025 | void bdrv_unref(BlockDriverState *bs) |
| 7026 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7027 | GLOBAL_STATE_CODE(); |
Jeff Cody | 9a4d5ca | 2014-07-23 17:22:57 -0400 | [diff] [blame] | 7028 | if (!bs) { |
| 7029 | return; |
| 7030 | } |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 7031 | assert(bs->refcnt > 0); |
| 7032 | if (--bs->refcnt == 0) { |
| 7033 | bdrv_delete(bs); |
| 7034 | } |
| 7035 | } |
| 7036 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7037 | struct BdrvOpBlocker { |
| 7038 | Error *reason; |
| 7039 | QLIST_ENTRY(BdrvOpBlocker) list; |
| 7040 | }; |
| 7041 | |
| 7042 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) |
| 7043 | { |
| 7044 | BdrvOpBlocker *blocker; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7045 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7046 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 7047 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { |
| 7048 | blocker = QLIST_FIRST(&bs->op_blockers[op]); |
Markus Armbruster | 4b57664 | 2018-10-17 10:26:25 +0200 | [diff] [blame] | 7049 | error_propagate_prepend(errp, error_copy(blocker->reason), |
| 7050 | "Node '%s' is busy: ", |
| 7051 | bdrv_get_device_or_node_name(bs)); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7052 | return true; |
| 7053 | } |
| 7054 | return false; |
| 7055 | } |
| 7056 | |
| 7057 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 7058 | { |
| 7059 | BdrvOpBlocker *blocker; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7060 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7061 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 7062 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 7063 | blocker = g_new0(BdrvOpBlocker, 1); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7064 | blocker->reason = reason; |
| 7065 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); |
| 7066 | } |
| 7067 | |
| 7068 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 7069 | { |
| 7070 | BdrvOpBlocker *blocker, *next; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7071 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7072 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 7073 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { |
| 7074 | if (blocker->reason == reason) { |
| 7075 | QLIST_REMOVE(blocker, list); |
| 7076 | g_free(blocker); |
| 7077 | } |
| 7078 | } |
| 7079 | } |
| 7080 | |
| 7081 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) |
| 7082 | { |
| 7083 | int i; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7084 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7085 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 7086 | bdrv_op_block(bs, i, reason); |
| 7087 | } |
| 7088 | } |
| 7089 | |
| 7090 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) |
| 7091 | { |
| 7092 | int i; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7093 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7094 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 7095 | bdrv_op_unblock(bs, i, reason); |
| 7096 | } |
| 7097 | } |
| 7098 | |
| 7099 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) |
| 7100 | { |
| 7101 | int i; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7102 | GLOBAL_STATE_CODE(); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 7103 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 7104 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { |
| 7105 | return false; |
| 7106 | } |
| 7107 | } |
| 7108 | return true; |
| 7109 | } |
| 7110 | |
Kevin Wolf | e135505 | 2022-12-07 14:18:30 +0100 | [diff] [blame] | 7111 | /* |
| 7112 | * Must not be called while holding the lock of an AioContext other than the |
| 7113 | * current one. |
| 7114 | */ |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 7115 | void bdrv_img_create(const char *filename, const char *fmt, |
| 7116 | const char *base_filename, const char *base_fmt, |
Fam Zheng | 9217283 | 2017-04-21 20:27:01 +0800 | [diff] [blame] | 7117 | char *options, uint64_t img_size, int flags, bool quiet, |
| 7118 | Error **errp) |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7119 | { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7120 | QemuOptsList *create_opts = NULL; |
| 7121 | QemuOpts *opts = NULL; |
| 7122 | const char *backing_fmt, *backing_file; |
| 7123 | int64_t size; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7124 | BlockDriver *drv, *proto_drv; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 7125 | Error *local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7126 | int ret = 0; |
| 7127 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7128 | GLOBAL_STATE_CODE(); |
| 7129 | |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7130 | /* Find driver and parse its options */ |
| 7131 | drv = bdrv_find_format(fmt); |
| 7132 | if (!drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 7133 | error_setg(errp, "Unknown file format '%s'", fmt); |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 7134 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7135 | } |
| 7136 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 7137 | proto_drv = bdrv_find_protocol(filename, true, errp); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7138 | if (!proto_drv) { |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 7139 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7140 | } |
| 7141 | |
Max Reitz | c614972 | 2014-12-02 18:32:45 +0100 | [diff] [blame] | 7142 | if (!drv->create_opts) { |
| 7143 | error_setg(errp, "Format driver '%s' does not support image creation", |
| 7144 | drv->format_name); |
| 7145 | return; |
| 7146 | } |
| 7147 | |
Maxim Levitsky | 5a5e7f8 | 2020-03-26 03:12:18 +0200 | [diff] [blame] | 7148 | if (!proto_drv->create_opts) { |
| 7149 | error_setg(errp, "Protocol driver '%s' does not support image creation", |
| 7150 | proto_drv->format_name); |
| 7151 | return; |
| 7152 | } |
| 7153 | |
Kevin Wolf | c6e0a6d | 2023-05-25 14:47:04 +0200 | [diff] [blame] | 7154 | aio_context_acquire(qemu_get_aio_context()); |
| 7155 | |
Kevin Wolf | f6dc1c3 | 2019-11-26 16:45:49 +0100 | [diff] [blame] | 7156 | /* Create parameter list */ |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 7157 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
Maxim Levitsky | 5a5e7f8 | 2020-03-26 03:12:18 +0200 | [diff] [blame] | 7158 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7159 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7160 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7161 | |
| 7162 | /* Parse -o options */ |
| 7163 | if (options) { |
Markus Armbruster | a5f9b9d | 2020-07-07 18:06:05 +0200 | [diff] [blame] | 7164 | if (!qemu_opts_do_parse(opts, options, NULL, errp)) { |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7165 | goto out; |
| 7166 | } |
| 7167 | } |
| 7168 | |
Kevin Wolf | f6dc1c3 | 2019-11-26 16:45:49 +0100 | [diff] [blame] | 7169 | if (!qemu_opt_get(opts, BLOCK_OPT_SIZE)) { |
| 7170 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size, &error_abort); |
| 7171 | } else if (img_size != UINT64_C(-1)) { |
| 7172 | error_setg(errp, "The image size must be specified only once"); |
| 7173 | goto out; |
| 7174 | } |
| 7175 | |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7176 | if (base_filename) { |
Markus Armbruster | 235e59c | 2020-07-07 18:05:42 +0200 | [diff] [blame] | 7177 | if (!qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, |
Markus Armbruster | 3882578 | 2020-07-07 18:05:43 +0200 | [diff] [blame] | 7178 | NULL)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 7179 | error_setg(errp, "Backing file not supported for file format '%s'", |
| 7180 | fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7181 | goto out; |
| 7182 | } |
| 7183 | } |
| 7184 | |
| 7185 | if (base_fmt) { |
Markus Armbruster | 3882578 | 2020-07-07 18:05:43 +0200 | [diff] [blame] | 7186 | if (!qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, NULL)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 7187 | error_setg(errp, "Backing file format not supported for file " |
| 7188 | "format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7189 | goto out; |
| 7190 | } |
| 7191 | } |
| 7192 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7193 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
| 7194 | if (backing_file) { |
| 7195 | if (!strcmp(filename, backing_file)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 7196 | error_setg(errp, "Error: Trying to create an image with the " |
| 7197 | "same filename as the backing file"); |
Jes Sorensen | 792da93 | 2010-12-16 13:52:17 +0100 | [diff] [blame] | 7198 | goto out; |
| 7199 | } |
Connor Kuehl | 975a7bd | 2020-08-13 08:47:22 -0500 | [diff] [blame] | 7200 | if (backing_file[0] == '\0') { |
| 7201 | error_setg(errp, "Expected backing file name, got empty string"); |
| 7202 | goto out; |
| 7203 | } |
Jes Sorensen | 792da93 | 2010-12-16 13:52:17 +0100 | [diff] [blame] | 7204 | } |
| 7205 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7206 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7207 | |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7208 | /* The size for the image must always be specified, unless we have a backing |
| 7209 | * file and we have not been forbidden from opening it. */ |
Eric Blake | a8b42a1 | 2017-09-25 09:55:07 -0500 | [diff] [blame] | 7210 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, img_size); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7211 | if (backing_file && !(flags & BDRV_O_NO_BACKING)) { |
| 7212 | BlockDriverState *bs; |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 7213 | char *full_backing; |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7214 | int back_flags; |
| 7215 | QDict *backing_options = NULL; |
Paolo Bonzini | 63090da | 2012-04-12 14:01:03 +0200 | [diff] [blame] | 7216 | |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 7217 | full_backing = |
| 7218 | bdrv_get_full_backing_filename_from_filename(filename, backing_file, |
| 7219 | &local_err); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7220 | if (local_err) { |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7221 | goto out; |
| 7222 | } |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 7223 | assert(full_backing); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7224 | |
Max Reitz | d5b2399 | 2021-06-22 16:00:30 +0200 | [diff] [blame] | 7225 | /* |
| 7226 | * No need to do I/O here, which allows us to open encrypted |
| 7227 | * backing images without needing the secret |
| 7228 | */ |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7229 | back_flags = flags; |
| 7230 | back_flags &= ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
Max Reitz | d5b2399 | 2021-06-22 16:00:30 +0200 | [diff] [blame] | 7231 | back_flags |= BDRV_O_NO_IO; |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7232 | |
Fam Zheng | cc954f0 | 2017-12-15 16:04:45 +0800 | [diff] [blame] | 7233 | backing_options = qdict_new(); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7234 | if (backing_fmt) { |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7235 | qdict_put_str(backing_options, "driver", backing_fmt); |
| 7236 | } |
Fam Zheng | cc954f0 | 2017-12-15 16:04:45 +0800 | [diff] [blame] | 7237 | qdict_put_bool(backing_options, BDRV_OPT_FORCE_SHARE, true); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7238 | |
| 7239 | bs = bdrv_open(full_backing, NULL, backing_options, back_flags, |
| 7240 | &local_err); |
| 7241 | g_free(full_backing); |
Eric Blake | add8200 | 2020-07-06 15:39:50 -0500 | [diff] [blame] | 7242 | if (!bs) { |
| 7243 | error_append_hint(&local_err, "Could not open backing image.\n"); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7244 | goto out; |
| 7245 | } else { |
Eric Blake | d9f059a | 2020-07-06 15:39:54 -0500 | [diff] [blame] | 7246 | if (!backing_fmt) { |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 7247 | error_setg(&local_err, |
| 7248 | "Backing file specified without backing format"); |
Michael Tokarev | fbdffb0 | 2023-04-05 16:34:04 +0300 | [diff] [blame] | 7249 | error_append_hint(&local_err, "Detected format of %s.\n", |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 7250 | bs->drv->format_name); |
| 7251 | goto out; |
Eric Blake | d9f059a | 2020-07-06 15:39:54 -0500 | [diff] [blame] | 7252 | } |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7253 | if (size == -1) { |
| 7254 | /* Opened BS, have no size */ |
| 7255 | size = bdrv_getlength(bs); |
| 7256 | if (size < 0) { |
| 7257 | error_setg_errno(errp, -size, "Could not get size of '%s'", |
| 7258 | backing_file); |
| 7259 | bdrv_unref(bs); |
| 7260 | goto out; |
| 7261 | } |
| 7262 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort); |
| 7263 | } |
| 7264 | bdrv_unref(bs); |
| 7265 | } |
Eric Blake | d9f059a | 2020-07-06 15:39:54 -0500 | [diff] [blame] | 7266 | /* (backing_file && !(flags & BDRV_O_NO_BACKING)) */ |
| 7267 | } else if (backing_file && !backing_fmt) { |
Eric Blake | 497a30d | 2021-05-03 14:36:00 -0700 | [diff] [blame] | 7268 | error_setg(&local_err, |
| 7269 | "Backing file specified without backing format"); |
| 7270 | goto out; |
Eric Blake | d9f059a | 2020-07-06 15:39:54 -0500 | [diff] [blame] | 7271 | } |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 7272 | |
| 7273 | if (size == -1) { |
| 7274 | error_setg(errp, "Image creation needs a size parameter"); |
| 7275 | goto out; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7276 | } |
| 7277 | |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 7278 | if (!quiet) { |
Kővágó, Zoltán | fe64669 | 2015-07-07 16:42:10 +0200 | [diff] [blame] | 7279 | printf("Formatting '%s', fmt=%s ", filename, fmt); |
Fam Zheng | 43c5d8f | 2014-12-09 15:38:04 +0800 | [diff] [blame] | 7280 | qemu_opts_print(opts, " "); |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 7281 | puts(""); |
Eric Blake | 4e2f441 | 2020-07-06 15:39:45 -0500 | [diff] [blame] | 7282 | fflush(stdout); |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 7283 | } |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7284 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 7285 | ret = bdrv_create(drv, filename, opts, &local_err); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7286 | |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 7287 | if (ret == -EFBIG) { |
| 7288 | /* This is generally a better message than whatever the driver would |
| 7289 | * deliver (especially because of the cluster_size_hint), since that |
| 7290 | * is most probably not much different from "image too large". */ |
| 7291 | const char *cluster_size_hint = ""; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7292 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 7293 | cluster_size_hint = " (try using a larger cluster size)"; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7294 | } |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 7295 | error_setg(errp, "The image size is too large for file format '%s'" |
| 7296 | "%s", fmt, cluster_size_hint); |
| 7297 | error_free(local_err); |
| 7298 | local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7299 | } |
| 7300 | |
| 7301 | out: |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 7302 | qemu_opts_del(opts); |
| 7303 | qemu_opts_free(create_opts); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 7304 | error_propagate(errp, local_err); |
Kevin Wolf | c6e0a6d | 2023-05-25 14:47:04 +0200 | [diff] [blame] | 7305 | aio_context_release(qemu_get_aio_context()); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 7306 | } |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 7307 | |
| 7308 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) |
| 7309 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7310 | IO_CODE(); |
Stefan Hajnoczi | 33f2a75 | 2018-02-16 16:50:13 +0000 | [diff] [blame] | 7311 | return bs ? bs->aio_context : qemu_get_aio_context(); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7312 | } |
| 7313 | |
Kevin Wolf | e336fd4 | 2020-10-05 17:58:53 +0200 | [diff] [blame] | 7314 | AioContext *coroutine_fn bdrv_co_enter(BlockDriverState *bs) |
| 7315 | { |
| 7316 | Coroutine *self = qemu_coroutine_self(); |
| 7317 | AioContext *old_ctx = qemu_coroutine_get_aio_context(self); |
| 7318 | AioContext *new_ctx; |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7319 | IO_CODE(); |
Kevin Wolf | e336fd4 | 2020-10-05 17:58:53 +0200 | [diff] [blame] | 7320 | |
| 7321 | /* |
| 7322 | * Increase bs->in_flight to ensure that this operation is completed before |
| 7323 | * moving the node to a different AioContext. Read new_ctx only afterwards. |
| 7324 | */ |
| 7325 | bdrv_inc_in_flight(bs); |
| 7326 | |
| 7327 | new_ctx = bdrv_get_aio_context(bs); |
| 7328 | aio_co_reschedule_self(new_ctx); |
| 7329 | return old_ctx; |
| 7330 | } |
| 7331 | |
| 7332 | void coroutine_fn bdrv_co_leave(BlockDriverState *bs, AioContext *old_ctx) |
| 7333 | { |
Emanuele Giuseppe Esposito | 384a48f | 2022-03-03 10:15:50 -0500 | [diff] [blame] | 7334 | IO_CODE(); |
Kevin Wolf | e336fd4 | 2020-10-05 17:58:53 +0200 | [diff] [blame] | 7335 | aio_co_reschedule_self(old_ctx); |
| 7336 | bdrv_dec_in_flight(bs); |
| 7337 | } |
| 7338 | |
Kevin Wolf | 18c6ac1 | 2020-10-05 17:58:54 +0200 | [diff] [blame] | 7339 | void coroutine_fn bdrv_co_lock(BlockDriverState *bs) |
| 7340 | { |
| 7341 | AioContext *ctx = bdrv_get_aio_context(bs); |
| 7342 | |
| 7343 | /* In the main thread, bs->aio_context won't change concurrently */ |
| 7344 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); |
| 7345 | |
| 7346 | /* |
| 7347 | * We're in coroutine context, so we already hold the lock of the main |
| 7348 | * loop AioContext. Don't lock it twice to avoid deadlocks. |
| 7349 | */ |
| 7350 | assert(qemu_in_coroutine()); |
| 7351 | if (ctx != qemu_get_aio_context()) { |
| 7352 | aio_context_acquire(ctx); |
| 7353 | } |
| 7354 | } |
| 7355 | |
| 7356 | void coroutine_fn bdrv_co_unlock(BlockDriverState *bs) |
| 7357 | { |
| 7358 | AioContext *ctx = bdrv_get_aio_context(bs); |
| 7359 | |
| 7360 | assert(qemu_in_coroutine()); |
| 7361 | if (ctx != qemu_get_aio_context()) { |
| 7362 | aio_context_release(ctx); |
| 7363 | } |
| 7364 | } |
| 7365 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7366 | static void bdrv_do_remove_aio_context_notifier(BdrvAioNotifier *ban) |
| 7367 | { |
Emanuele Giuseppe Esposito | bdb7347 | 2022-03-03 10:16:02 -0500 | [diff] [blame] | 7368 | GLOBAL_STATE_CODE(); |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7369 | QLIST_REMOVE(ban, list); |
| 7370 | g_free(ban); |
| 7371 | } |
| 7372 | |
Kevin Wolf | a3a683c | 2019-05-06 19:17:57 +0200 | [diff] [blame] | 7373 | static void bdrv_detach_aio_context(BlockDriverState *bs) |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7374 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7375 | BdrvAioNotifier *baf, *baf_tmp; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7376 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7377 | assert(!bs->walking_aio_notifiers); |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 7378 | GLOBAL_STATE_CODE(); |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7379 | bs->walking_aio_notifiers = true; |
| 7380 | QLIST_FOREACH_SAFE(baf, &bs->aio_notifiers, list, baf_tmp) { |
| 7381 | if (baf->deleted) { |
| 7382 | bdrv_do_remove_aio_context_notifier(baf); |
| 7383 | } else { |
| 7384 | baf->detach_aio_context(baf->opaque); |
| 7385 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7386 | } |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7387 | /* Never mind iterating again to check for ->deleted. bdrv_close() will |
| 7388 | * remove remaining aio notifiers if we aren't called again. |
| 7389 | */ |
| 7390 | bs->walking_aio_notifiers = false; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7391 | |
Kevin Wolf | 1bffe1a | 2019-04-17 17:15:25 +0200 | [diff] [blame] | 7392 | if (bs->drv && bs->drv->bdrv_detach_aio_context) { |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7393 | bs->drv->bdrv_detach_aio_context(bs); |
| 7394 | } |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7395 | |
| 7396 | bs->aio_context = NULL; |
| 7397 | } |
| 7398 | |
Kevin Wolf | a3a683c | 2019-05-06 19:17:57 +0200 | [diff] [blame] | 7399 | static void bdrv_attach_aio_context(BlockDriverState *bs, |
| 7400 | AioContext *new_context) |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7401 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7402 | BdrvAioNotifier *ban, *ban_tmp; |
Emanuele Giuseppe Esposito | da35990 | 2022-03-03 10:16:11 -0500 | [diff] [blame] | 7403 | GLOBAL_STATE_CODE(); |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7404 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7405 | bs->aio_context = new_context; |
| 7406 | |
Kevin Wolf | 1bffe1a | 2019-04-17 17:15:25 +0200 | [diff] [blame] | 7407 | if (bs->drv && bs->drv->bdrv_attach_aio_context) { |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7408 | bs->drv->bdrv_attach_aio_context(bs, new_context); |
| 7409 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7410 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7411 | assert(!bs->walking_aio_notifiers); |
| 7412 | bs->walking_aio_notifiers = true; |
| 7413 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_tmp) { |
| 7414 | if (ban->deleted) { |
| 7415 | bdrv_do_remove_aio_context_notifier(ban); |
| 7416 | } else { |
| 7417 | ban->attached_aio_context(new_context, ban->opaque); |
| 7418 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7419 | } |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7420 | bs->walking_aio_notifiers = false; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 7421 | } |
| 7422 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7423 | typedef struct BdrvStateSetAioContext { |
| 7424 | AioContext *new_ctx; |
| 7425 | BlockDriverState *bs; |
| 7426 | } BdrvStateSetAioContext; |
| 7427 | |
| 7428 | static bool bdrv_parent_change_aio_context(BdrvChild *c, AioContext *ctx, |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7429 | GHashTable *visited, |
| 7430 | Transaction *tran, |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7431 | Error **errp) |
| 7432 | { |
| 7433 | GLOBAL_STATE_CODE(); |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7434 | if (g_hash_table_contains(visited, c)) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7435 | return true; |
| 7436 | } |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7437 | g_hash_table_add(visited, c); |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7438 | |
| 7439 | /* |
| 7440 | * A BdrvChildClass that doesn't handle AioContext changes cannot |
| 7441 | * tolerate any AioContext changes |
| 7442 | */ |
| 7443 | if (!c->klass->change_aio_ctx) { |
| 7444 | char *user = bdrv_child_user_desc(c); |
| 7445 | error_setg(errp, "Changing iothreads is not supported by %s", user); |
| 7446 | g_free(user); |
| 7447 | return false; |
| 7448 | } |
| 7449 | if (!c->klass->change_aio_ctx(c, ctx, visited, tran, errp)) { |
| 7450 | assert(!errp || *errp); |
| 7451 | return false; |
| 7452 | } |
| 7453 | return true; |
| 7454 | } |
| 7455 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7456 | bool bdrv_child_change_aio_context(BdrvChild *c, AioContext *ctx, |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7457 | GHashTable *visited, Transaction *tran, |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7458 | Error **errp) |
| 7459 | { |
| 7460 | GLOBAL_STATE_CODE(); |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7461 | if (g_hash_table_contains(visited, c)) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7462 | return true; |
| 7463 | } |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7464 | g_hash_table_add(visited, c); |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7465 | return bdrv_change_aio_context(c->bs, ctx, visited, tran, errp); |
| 7466 | } |
| 7467 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7468 | static void bdrv_set_aio_context_clean(void *opaque) |
| 7469 | { |
| 7470 | BdrvStateSetAioContext *state = (BdrvStateSetAioContext *) opaque; |
| 7471 | BlockDriverState *bs = (BlockDriverState *) state->bs; |
| 7472 | |
| 7473 | /* Paired with bdrv_drained_begin in bdrv_change_aio_context() */ |
| 7474 | bdrv_drained_end(bs); |
| 7475 | |
| 7476 | g_free(state); |
| 7477 | } |
| 7478 | |
| 7479 | static void bdrv_set_aio_context_commit(void *opaque) |
| 7480 | { |
| 7481 | BdrvStateSetAioContext *state = (BdrvStateSetAioContext *) opaque; |
| 7482 | BlockDriverState *bs = (BlockDriverState *) state->bs; |
| 7483 | AioContext *new_context = state->new_ctx; |
| 7484 | AioContext *old_context = bdrv_get_aio_context(bs); |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7485 | |
| 7486 | /* |
| 7487 | * Take the old AioContex when detaching it from bs. |
| 7488 | * At this point, new_context lock is already acquired, and we are now |
| 7489 | * also taking old_context. This is safe as long as bdrv_detach_aio_context |
| 7490 | * does not call AIO_POLL_WHILE(). |
| 7491 | */ |
| 7492 | if (old_context != qemu_get_aio_context()) { |
| 7493 | aio_context_acquire(old_context); |
| 7494 | } |
| 7495 | bdrv_detach_aio_context(bs); |
| 7496 | if (old_context != qemu_get_aio_context()) { |
| 7497 | aio_context_release(old_context); |
| 7498 | } |
| 7499 | bdrv_attach_aio_context(bs, new_context); |
| 7500 | } |
| 7501 | |
| 7502 | static TransactionActionDrv set_aio_context = { |
| 7503 | .commit = bdrv_set_aio_context_commit, |
| 7504 | .clean = bdrv_set_aio_context_clean, |
| 7505 | }; |
| 7506 | |
Kevin Wolf | 42a65f0 | 2019-05-07 18:31:38 +0200 | [diff] [blame] | 7507 | /* |
| 7508 | * Changes the AioContext used for fd handlers, timers, and BHs by this |
| 7509 | * BlockDriverState and all its children and parents. |
| 7510 | * |
Max Reitz | 43eaaae | 2019-07-22 15:30:54 +0200 | [diff] [blame] | 7511 | * Must be called from the main AioContext. |
| 7512 | * |
Kevin Wolf | 42a65f0 | 2019-05-07 18:31:38 +0200 | [diff] [blame] | 7513 | * The caller must own the AioContext lock for the old AioContext of bs, but it |
| 7514 | * must not own the AioContext lock for new_context (unless new_context is the |
| 7515 | * same as the current context of bs). |
| 7516 | * |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7517 | * @visited will accumulate all visited BdrvChild objects. The caller is |
Kevin Wolf | 42a65f0 | 2019-05-07 18:31:38 +0200 | [diff] [blame] | 7518 | * responsible for freeing the list afterwards. |
| 7519 | */ |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7520 | static bool bdrv_change_aio_context(BlockDriverState *bs, AioContext *ctx, |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7521 | GHashTable *visited, Transaction *tran, |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7522 | Error **errp) |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7523 | { |
| 7524 | BdrvChild *c; |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7525 | BdrvStateSetAioContext *state; |
| 7526 | |
| 7527 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7528 | |
| 7529 | if (bdrv_get_aio_context(bs) == ctx) { |
| 7530 | return true; |
| 7531 | } |
| 7532 | |
| 7533 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7534 | if (!bdrv_parent_change_aio_context(c, ctx, visited, tran, errp)) { |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7535 | return false; |
| 7536 | } |
| 7537 | } |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7538 | |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7539 | QLIST_FOREACH(c, &bs->children, next) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7540 | if (!bdrv_child_change_aio_context(c, ctx, visited, tran, errp)) { |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7541 | return false; |
| 7542 | } |
| 7543 | } |
| 7544 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7545 | state = g_new(BdrvStateSetAioContext, 1); |
| 7546 | *state = (BdrvStateSetAioContext) { |
| 7547 | .new_ctx = ctx, |
| 7548 | .bs = bs, |
| 7549 | }; |
| 7550 | |
| 7551 | /* Paired with bdrv_drained_end in bdrv_set_aio_context_clean() */ |
| 7552 | bdrv_drained_begin(bs); |
| 7553 | |
| 7554 | tran_add(tran, &set_aio_context, state); |
| 7555 | |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7556 | return true; |
| 7557 | } |
| 7558 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7559 | /* |
| 7560 | * Change bs's and recursively all of its parents' and children's AioContext |
| 7561 | * to the given new context, returning an error if that isn't possible. |
| 7562 | * |
| 7563 | * If ignore_child is not NULL, that child (and its subgraph) will not |
| 7564 | * be touched. |
| 7565 | * |
| 7566 | * This function still requires the caller to take the bs current |
| 7567 | * AioContext lock, otherwise draining will fail since AIO_WAIT_WHILE |
| 7568 | * assumes the lock is always held if bs is in another AioContext. |
| 7569 | * For the same reason, it temporarily also holds the new AioContext, since |
| 7570 | * bdrv_drained_end calls BDRV_POLL_WHILE that assumes the lock is taken too. |
| 7571 | * Therefore the new AioContext lock must not be taken by the caller. |
| 7572 | */ |
Emanuele Giuseppe Esposito | a41cfda | 2022-10-25 04:49:51 -0400 | [diff] [blame] | 7573 | int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx, |
| 7574 | BdrvChild *ignore_child, Error **errp) |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7575 | { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7576 | Transaction *tran; |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7577 | GHashTable *visited; |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7578 | int ret; |
| 7579 | AioContext *old_context = bdrv_get_aio_context(bs); |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7580 | GLOBAL_STATE_CODE(); |
| 7581 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7582 | /* |
| 7583 | * Recursion phase: go through all nodes of the graph. |
| 7584 | * Take care of checking that all nodes support changing AioContext |
| 7585 | * and drain them, builing a linear list of callbacks to run if everything |
| 7586 | * is successful (the transaction itself). |
| 7587 | */ |
| 7588 | tran = tran_new(); |
Emanuele Giuseppe Esposito | e08cc00 | 2022-10-25 04:49:45 -0400 | [diff] [blame] | 7589 | visited = g_hash_table_new(NULL, NULL); |
| 7590 | if (ignore_child) { |
| 7591 | g_hash_table_add(visited, ignore_child); |
| 7592 | } |
| 7593 | ret = bdrv_change_aio_context(bs, ctx, visited, tran, errp); |
| 7594 | g_hash_table_destroy(visited); |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7595 | |
| 7596 | /* |
| 7597 | * Linear phase: go through all callbacks collected in the transaction. |
| 7598 | * Run all callbacks collected in the recursion to switch all nodes |
| 7599 | * AioContext lock (transaction commit), or undo all changes done in the |
| 7600 | * recursion (transaction abort). |
| 7601 | */ |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7602 | |
| 7603 | if (!ret) { |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7604 | /* Just run clean() callbacks. No AioContext changed. */ |
| 7605 | tran_abort(tran); |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7606 | return -EPERM; |
| 7607 | } |
| 7608 | |
Emanuele Giuseppe Esposito | 7e8c182 | 2022-10-25 04:49:44 -0400 | [diff] [blame] | 7609 | /* |
| 7610 | * Release old AioContext, it won't be needed anymore, as all |
| 7611 | * bdrv_drained_begin() have been called already. |
| 7612 | */ |
| 7613 | if (qemu_get_aio_context() != old_context) { |
| 7614 | aio_context_release(old_context); |
| 7615 | } |
| 7616 | |
| 7617 | /* |
| 7618 | * Acquire new AioContext since bdrv_drained_end() is going to be called |
| 7619 | * after we switched all nodes in the new AioContext, and the function |
| 7620 | * assumes that the lock of the bs is always taken. |
| 7621 | */ |
| 7622 | if (qemu_get_aio_context() != ctx) { |
| 7623 | aio_context_acquire(ctx); |
| 7624 | } |
| 7625 | |
| 7626 | tran_commit(tran); |
| 7627 | |
| 7628 | if (qemu_get_aio_context() != ctx) { |
| 7629 | aio_context_release(ctx); |
| 7630 | } |
| 7631 | |
| 7632 | /* Re-acquire the old AioContext, since the caller takes and releases it. */ |
| 7633 | if (qemu_get_aio_context() != old_context) { |
| 7634 | aio_context_acquire(old_context); |
| 7635 | } |
Kevin Wolf | 53a7d04 | 2019-05-06 19:17:59 +0200 | [diff] [blame] | 7636 | |
Kevin Wolf | 5d23184 | 2019-05-06 19:17:56 +0200 | [diff] [blame] | 7637 | return 0; |
| 7638 | } |
| 7639 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7640 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
| 7641 | void (*attached_aio_context)(AioContext *new_context, void *opaque), |
| 7642 | void (*detach_aio_context)(void *opaque), void *opaque) |
| 7643 | { |
| 7644 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); |
| 7645 | *ban = (BdrvAioNotifier){ |
| 7646 | .attached_aio_context = attached_aio_context, |
| 7647 | .detach_aio_context = detach_aio_context, |
| 7648 | .opaque = opaque |
| 7649 | }; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7650 | GLOBAL_STATE_CODE(); |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7651 | |
| 7652 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); |
| 7653 | } |
| 7654 | |
| 7655 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, |
| 7656 | void (*attached_aio_context)(AioContext *, |
| 7657 | void *), |
| 7658 | void (*detach_aio_context)(void *), |
| 7659 | void *opaque) |
| 7660 | { |
| 7661 | BdrvAioNotifier *ban, *ban_next; |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7662 | GLOBAL_STATE_CODE(); |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7663 | |
| 7664 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 7665 | if (ban->attached_aio_context == attached_aio_context && |
| 7666 | ban->detach_aio_context == detach_aio_context && |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7667 | ban->opaque == opaque && |
| 7668 | ban->deleted == false) |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7669 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 7670 | if (bs->walking_aio_notifiers) { |
| 7671 | ban->deleted = true; |
| 7672 | } else { |
| 7673 | bdrv_do_remove_aio_context_notifier(ban); |
| 7674 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 7675 | return; |
| 7676 | } |
| 7677 | } |
| 7678 | |
| 7679 | abort(); |
| 7680 | } |
| 7681 | |
Max Reitz | 7748543 | 2014-10-27 11:12:50 +0100 | [diff] [blame] | 7682 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 7683 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
Maxim Levitsky | a3579bf | 2020-06-25 14:55:38 +0200 | [diff] [blame] | 7684 | bool force, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 7685 | Error **errp) |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 7686 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7687 | GLOBAL_STATE_CODE(); |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 7688 | if (!bs->drv) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 7689 | error_setg(errp, "Node is ejected"); |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 7690 | return -ENOMEDIUM; |
| 7691 | } |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 7692 | if (!bs->drv->bdrv_amend_options) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 7693 | error_setg(errp, "Block driver '%s' does not support option amendment", |
| 7694 | bs->drv->format_name); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 7695 | return -ENOTSUP; |
| 7696 | } |
Maxim Levitsky | a3579bf | 2020-06-25 14:55:38 +0200 | [diff] [blame] | 7697 | return bs->drv->bdrv_amend_options(bs, opts, status_cb, |
| 7698 | cb_opaque, force, errp); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 7699 | } |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 7700 | |
Max Reitz | 5d69b5a | 2020-02-18 11:34:41 +0100 | [diff] [blame] | 7701 | /* |
| 7702 | * This function checks whether the given @to_replace is allowed to be |
| 7703 | * replaced by a node that always shows the same data as @bs. This is |
| 7704 | * used for example to verify whether the mirror job can replace |
| 7705 | * @to_replace by the target mirrored from @bs. |
| 7706 | * To be replaceable, @bs and @to_replace may either be guaranteed to |
| 7707 | * always show the same data (because they are only connected through |
| 7708 | * filters), or some driver may allow replacing one of its children |
| 7709 | * because it can guarantee that this child's data is not visible at |
| 7710 | * all (for example, for dissenting quorum children that have no other |
| 7711 | * parents). |
| 7712 | */ |
| 7713 | bool bdrv_recurse_can_replace(BlockDriverState *bs, |
| 7714 | BlockDriverState *to_replace) |
| 7715 | { |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 7716 | BlockDriverState *filtered; |
| 7717 | |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 7718 | GLOBAL_STATE_CODE(); |
| 7719 | |
Max Reitz | 5d69b5a | 2020-02-18 11:34:41 +0100 | [diff] [blame] | 7720 | if (!bs || !bs->drv) { |
| 7721 | return false; |
| 7722 | } |
| 7723 | |
| 7724 | if (bs == to_replace) { |
| 7725 | return true; |
| 7726 | } |
| 7727 | |
| 7728 | /* See what the driver can do */ |
| 7729 | if (bs->drv->bdrv_recurse_can_replace) { |
| 7730 | return bs->drv->bdrv_recurse_can_replace(bs, to_replace); |
| 7731 | } |
| 7732 | |
| 7733 | /* For filters without an own implementation, we can recurse on our own */ |
Max Reitz | 93393e6 | 2019-06-12 17:03:38 +0200 | [diff] [blame] | 7734 | filtered = bdrv_filter_bs(bs); |
| 7735 | if (filtered) { |
| 7736 | return bdrv_recurse_can_replace(filtered, to_replace); |
Max Reitz | 5d69b5a | 2020-02-18 11:34:41 +0100 | [diff] [blame] | 7737 | } |
| 7738 | |
| 7739 | /* Safe default */ |
| 7740 | return false; |
| 7741 | } |
| 7742 | |
Max Reitz | 810803a | 2020-02-18 11:34:44 +0100 | [diff] [blame] | 7743 | /* |
| 7744 | * Check whether the given @node_name can be replaced by a node that |
| 7745 | * has the same data as @parent_bs. If so, return @node_name's BDS; |
| 7746 | * NULL otherwise. |
| 7747 | * |
| 7748 | * @node_name must be a (recursive) *child of @parent_bs (or this |
| 7749 | * function will return NULL). |
| 7750 | * |
| 7751 | * The result (whether the node can be replaced or not) is only valid |
| 7752 | * for as long as no graph or permission changes occur. |
| 7753 | */ |
Wen Congyang | e12f378 | 2015-07-17 10:12:22 +0800 | [diff] [blame] | 7754 | BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, |
| 7755 | const char *node_name, Error **errp) |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7756 | { |
| 7757 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 7758 | AioContext *aio_context; |
| 7759 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7760 | GLOBAL_STATE_CODE(); |
| 7761 | |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7762 | if (!to_replace_bs) { |
Connor Kuehl | 785ec4b | 2021-03-05 09:19:28 -0600 | [diff] [blame] | 7763 | 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] | 7764 | return NULL; |
| 7765 | } |
| 7766 | |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 7767 | aio_context = bdrv_get_aio_context(to_replace_bs); |
| 7768 | aio_context_acquire(aio_context); |
| 7769 | |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7770 | if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) { |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 7771 | to_replace_bs = NULL; |
| 7772 | goto out; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7773 | } |
| 7774 | |
| 7775 | /* We don't want arbitrary node of the BDS chain to be replaced only the top |
| 7776 | * most non filter in order to prevent data corruption. |
| 7777 | * Another benefit is that this tests exclude backing files which are |
| 7778 | * blocked by the backing blockers. |
| 7779 | */ |
Max Reitz | 810803a | 2020-02-18 11:34:44 +0100 | [diff] [blame] | 7780 | if (!bdrv_recurse_can_replace(parent_bs, to_replace_bs)) { |
| 7781 | error_setg(errp, "Cannot replace '%s' by a node mirrored from '%s', " |
| 7782 | "because it cannot be guaranteed that doing so would not " |
| 7783 | "lead to an abrupt change of visible data", |
| 7784 | node_name, parent_bs->node_name); |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 7785 | to_replace_bs = NULL; |
| 7786 | goto out; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7787 | } |
| 7788 | |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 7789 | out: |
| 7790 | aio_context_release(aio_context); |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 7791 | return to_replace_bs; |
| 7792 | } |
Ming Lei | 448ad91 | 2014-07-04 18:04:33 +0800 | [diff] [blame] | 7793 | |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7794 | /** |
| 7795 | * Iterates through the list of runtime option keys that are said to |
| 7796 | * be "strong" for a BDS. An option is called "strong" if it changes |
| 7797 | * a BDS's data. For example, the null block driver's "size" and |
| 7798 | * "read-zeroes" options are strong, but its "latency-ns" option is |
| 7799 | * not. |
| 7800 | * |
| 7801 | * If a key returned by this function ends with a dot, all options |
| 7802 | * starting with that prefix are strong. |
| 7803 | */ |
| 7804 | static const char *const *strong_options(BlockDriverState *bs, |
| 7805 | const char *const *curopt) |
| 7806 | { |
| 7807 | static const char *const global_options[] = { |
| 7808 | "driver", "filename", NULL |
| 7809 | }; |
| 7810 | |
| 7811 | if (!curopt) { |
| 7812 | return &global_options[0]; |
| 7813 | } |
| 7814 | |
| 7815 | curopt++; |
| 7816 | if (curopt == &global_options[ARRAY_SIZE(global_options) - 1] && bs->drv) { |
| 7817 | curopt = bs->drv->strong_runtime_opts; |
| 7818 | } |
| 7819 | |
| 7820 | return (curopt && *curopt) ? curopt : NULL; |
| 7821 | } |
| 7822 | |
| 7823 | /** |
| 7824 | * Copies all strong runtime options from bs->options to the given |
| 7825 | * QDict. The set of strong option keys is determined by invoking |
| 7826 | * strong_options(). |
| 7827 | * |
| 7828 | * Returns true iff any strong option was present in bs->options (and |
| 7829 | * thus copied to the target QDict) with the exception of "filename" |
| 7830 | * and "driver". The caller is expected to use this value to decide |
| 7831 | * whether the existence of strong options prevents the generation of |
| 7832 | * a plain filename. |
| 7833 | */ |
| 7834 | static bool append_strong_runtime_options(QDict *d, BlockDriverState *bs) |
| 7835 | { |
| 7836 | bool found_any = false; |
| 7837 | const char *const *option_name = NULL; |
| 7838 | |
| 7839 | if (!bs->drv) { |
| 7840 | return false; |
| 7841 | } |
| 7842 | |
| 7843 | while ((option_name = strong_options(bs, option_name))) { |
| 7844 | bool option_given = false; |
| 7845 | |
| 7846 | assert(strlen(*option_name) > 0); |
| 7847 | if ((*option_name)[strlen(*option_name) - 1] != '.') { |
| 7848 | QObject *entry = qdict_get(bs->options, *option_name); |
| 7849 | if (!entry) { |
| 7850 | continue; |
| 7851 | } |
| 7852 | |
| 7853 | qdict_put_obj(d, *option_name, qobject_ref(entry)); |
| 7854 | option_given = true; |
| 7855 | } else { |
| 7856 | const QDictEntry *entry; |
| 7857 | for (entry = qdict_first(bs->options); entry; |
| 7858 | entry = qdict_next(bs->options, entry)) |
| 7859 | { |
| 7860 | if (strstart(qdict_entry_key(entry), *option_name, NULL)) { |
| 7861 | qdict_put_obj(d, qdict_entry_key(entry), |
| 7862 | qobject_ref(qdict_entry_value(entry))); |
| 7863 | option_given = true; |
| 7864 | } |
| 7865 | } |
| 7866 | } |
| 7867 | |
| 7868 | /* While "driver" and "filename" need to be included in a JSON filename, |
| 7869 | * their existence does not prohibit generation of a plain filename. */ |
| 7870 | if (!found_any && option_given && |
| 7871 | strcmp(*option_name, "driver") && strcmp(*option_name, "filename")) |
| 7872 | { |
| 7873 | found_any = true; |
| 7874 | } |
| 7875 | } |
| 7876 | |
Max Reitz | 62a01a27 | 2019-02-01 20:29:34 +0100 | [diff] [blame] | 7877 | if (!qdict_haskey(d, "driver")) { |
| 7878 | /* Drivers created with bdrv_new_open_driver() may not have a |
| 7879 | * @driver option. Add it here. */ |
| 7880 | qdict_put_str(d, "driver", bs->drv->format_name); |
| 7881 | } |
| 7882 | |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7883 | return found_any; |
| 7884 | } |
| 7885 | |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7886 | /* Note: This function may return false positives; it may return true |
| 7887 | * even if opening the backing file specified by bs's image header |
| 7888 | * would result in exactly bs->backing. */ |
Emanuele Giuseppe Esposito | fa8fc1d | 2021-12-15 07:11:38 -0500 | [diff] [blame] | 7889 | static bool bdrv_backing_overridden(BlockDriverState *bs) |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7890 | { |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 7891 | GLOBAL_STATE_CODE(); |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7892 | if (bs->backing) { |
| 7893 | return strcmp(bs->auto_backing_file, |
| 7894 | bs->backing->bs->filename); |
| 7895 | } else { |
| 7896 | /* No backing BDS, so if the image header reports any backing |
| 7897 | * file, it must have been suppressed */ |
| 7898 | return bs->auto_backing_file[0] != '\0'; |
| 7899 | } |
| 7900 | } |
| 7901 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7902 | /* Updates the following BDS fields: |
| 7903 | * - exact_filename: A filename which may be used for opening a block device |
| 7904 | * which (mostly) equals the given BDS (even without any |
| 7905 | * other options; so reading and writing must return the same |
| 7906 | * results, but caching etc. may be different) |
| 7907 | * - full_open_options: Options which, when given when opening a block device |
| 7908 | * (without a filename), result in a BDS (mostly) |
| 7909 | * equalling the given one |
| 7910 | * - filename: If exact_filename is set, it is copied here. Otherwise, |
| 7911 | * full_open_options is converted to a JSON object, prefixed with |
| 7912 | * "json:" (for use through the JSON pseudo protocol) and put here. |
| 7913 | */ |
| 7914 | void bdrv_refresh_filename(BlockDriverState *bs) |
| 7915 | { |
| 7916 | BlockDriver *drv = bs->drv; |
Max Reitz | e24518e | 2019-02-01 20:29:06 +0100 | [diff] [blame] | 7917 | BdrvChild *child; |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 7918 | BlockDriverState *primary_child_bs; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7919 | QDict *opts; |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7920 | bool backing_overridden; |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 7921 | bool generate_json_filename; /* Whether our default implementation should |
| 7922 | fill exact_filename (false) or not (true) */ |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7923 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 7924 | GLOBAL_STATE_CODE(); |
| 7925 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7926 | if (!drv) { |
| 7927 | return; |
| 7928 | } |
| 7929 | |
Max Reitz | e24518e | 2019-02-01 20:29:06 +0100 | [diff] [blame] | 7930 | /* This BDS's file name may depend on any of its children's file names, so |
| 7931 | * refresh those first */ |
| 7932 | QLIST_FOREACH(child, &bs->children, next) { |
| 7933 | bdrv_refresh_filename(child->bs); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 7934 | } |
| 7935 | |
Max Reitz | bb808d5 | 2019-02-01 20:29:07 +0100 | [diff] [blame] | 7936 | if (bs->implicit) { |
| 7937 | /* For implicit nodes, just copy everything from the single child */ |
| 7938 | child = QLIST_FIRST(&bs->children); |
| 7939 | assert(QLIST_NEXT(child, next) == NULL); |
| 7940 | |
| 7941 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), |
| 7942 | child->bs->exact_filename); |
| 7943 | pstrcpy(bs->filename, sizeof(bs->filename), child->bs->filename); |
| 7944 | |
Pan Nengyuan | cb89561 | 2020-01-16 16:56:00 +0800 | [diff] [blame] | 7945 | qobject_unref(bs->full_open_options); |
Max Reitz | bb808d5 | 2019-02-01 20:29:07 +0100 | [diff] [blame] | 7946 | bs->full_open_options = qobject_ref(child->bs->full_open_options); |
| 7947 | |
| 7948 | return; |
| 7949 | } |
| 7950 | |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 7951 | backing_overridden = bdrv_backing_overridden(bs); |
| 7952 | |
| 7953 | if (bs->open_flags & BDRV_O_NO_IO) { |
| 7954 | /* Without I/O, the backing file does not change anything. |
| 7955 | * Therefore, in such a case (primarily qemu-img), we can |
| 7956 | * pretend the backing file has not been overridden even if |
| 7957 | * it technically has been. */ |
| 7958 | backing_overridden = false; |
| 7959 | } |
| 7960 | |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7961 | /* Gather the options QDict */ |
| 7962 | opts = qdict_new(); |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 7963 | generate_json_filename = append_strong_runtime_options(opts, bs); |
| 7964 | generate_json_filename |= backing_overridden; |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7965 | |
| 7966 | if (drv->bdrv_gather_child_options) { |
| 7967 | /* Some block drivers may not want to present all of their children's |
| 7968 | * options, or name them differently from BdrvChild.name */ |
| 7969 | drv->bdrv_gather_child_options(bs, opts, backing_overridden); |
| 7970 | } else { |
| 7971 | QLIST_FOREACH(child, &bs->children, next) { |
Max Reitz | 25191e5 | 2020-05-13 13:05:33 +0200 | [diff] [blame] | 7972 | if (child == bs->backing && !backing_overridden) { |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 7973 | /* We can skip the backing BDS if it has not been overridden */ |
| 7974 | continue; |
| 7975 | } |
| 7976 | |
| 7977 | qdict_put(opts, child->name, |
| 7978 | qobject_ref(child->bs->full_open_options)); |
| 7979 | } |
| 7980 | |
| 7981 | if (backing_overridden && !bs->backing) { |
| 7982 | /* Force no backing file */ |
| 7983 | qdict_put_null(opts, "backing"); |
| 7984 | } |
| 7985 | } |
| 7986 | |
| 7987 | qobject_unref(bs->full_open_options); |
| 7988 | bs->full_open_options = opts; |
| 7989 | |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 7990 | primary_child_bs = bdrv_primary_bs(bs); |
| 7991 | |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 7992 | if (drv->bdrv_refresh_filename) { |
| 7993 | /* Obsolete information is of no use here, so drop the old file name |
| 7994 | * information before refreshing it */ |
| 7995 | bs->exact_filename[0] = '\0'; |
| 7996 | |
| 7997 | drv->bdrv_refresh_filename(bs); |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 7998 | } else if (primary_child_bs) { |
| 7999 | /* |
| 8000 | * Try to reconstruct valid information from the underlying |
| 8001 | * file -- this only works for format nodes (filter nodes |
| 8002 | * cannot be probed and as such must be selected by the user |
| 8003 | * either through an options dict, or through a special |
| 8004 | * filename which the filter driver must construct in its |
| 8005 | * .bdrv_refresh_filename() implementation). |
| 8006 | */ |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 8007 | |
| 8008 | bs->exact_filename[0] = '\0'; |
| 8009 | |
Max Reitz | fb695c7 | 2019-02-01 20:29:29 +0100 | [diff] [blame] | 8010 | /* |
| 8011 | * We can use the underlying file's filename if: |
| 8012 | * - it has a filename, |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8013 | * - the current BDS is not a filter, |
Max Reitz | fb695c7 | 2019-02-01 20:29:29 +0100 | [diff] [blame] | 8014 | * - the file is a protocol BDS, and |
| 8015 | * - opening that file (as this BDS's format) will automatically create |
| 8016 | * the BDS tree we have right now, that is: |
| 8017 | * - the user did not significantly change this BDS's behavior with |
| 8018 | * some explicit (strong) options |
| 8019 | * - no non-file child of this BDS has been overridden by the user |
| 8020 | * Both of these conditions are represented by generate_json_filename. |
| 8021 | */ |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8022 | if (primary_child_bs->exact_filename[0] && |
| 8023 | primary_child_bs->drv->bdrv_file_open && |
| 8024 | !drv->is_filter && !generate_json_filename) |
Max Reitz | fb695c7 | 2019-02-01 20:29:29 +0100 | [diff] [blame] | 8025 | { |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8026 | strcpy(bs->exact_filename, primary_child_bs->exact_filename); |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 8027 | } |
| 8028 | } |
| 8029 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 8030 | if (bs->exact_filename[0]) { |
| 8031 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 8032 | } else { |
Markus Armbruster | eab3a46 | 2020-12-11 18:11:37 +0100 | [diff] [blame] | 8033 | GString *json = qobject_to_json(QOBJECT(bs->full_open_options)); |
Eric Blake | 5c86bdf | 2020-06-08 13:26:38 -0500 | [diff] [blame] | 8034 | if (snprintf(bs->filename, sizeof(bs->filename), "json:%s", |
Markus Armbruster | eab3a46 | 2020-12-11 18:11:37 +0100 | [diff] [blame] | 8035 | json->str) >= sizeof(bs->filename)) { |
Eric Blake | 5c86bdf | 2020-06-08 13:26:38 -0500 | [diff] [blame] | 8036 | /* Give user a hint if we truncated things. */ |
| 8037 | strcpy(bs->filename + sizeof(bs->filename) - 4, "..."); |
| 8038 | } |
Markus Armbruster | eab3a46 | 2020-12-11 18:11:37 +0100 | [diff] [blame] | 8039 | g_string_free(json, true); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 8040 | } |
| 8041 | } |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8042 | |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 8043 | char *bdrv_dirname(BlockDriverState *bs, Error **errp) |
| 8044 | { |
| 8045 | BlockDriver *drv = bs->drv; |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8046 | BlockDriverState *child_bs; |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 8047 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 8048 | GLOBAL_STATE_CODE(); |
| 8049 | |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 8050 | if (!drv) { |
| 8051 | error_setg(errp, "Node '%s' is ejected", bs->node_name); |
| 8052 | return NULL; |
| 8053 | } |
| 8054 | |
| 8055 | if (drv->bdrv_dirname) { |
| 8056 | return drv->bdrv_dirname(bs, errp); |
| 8057 | } |
| 8058 | |
Max Reitz | 52f72d6 | 2019-06-12 17:43:03 +0200 | [diff] [blame] | 8059 | child_bs = bdrv_primary_bs(bs); |
| 8060 | if (child_bs) { |
| 8061 | return bdrv_dirname(child_bs, errp); |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 8062 | } |
| 8063 | |
| 8064 | bdrv_refresh_filename(bs); |
| 8065 | if (bs->exact_filename[0] != '\0') { |
| 8066 | return path_combine(bs->exact_filename, ""); |
| 8067 | } |
| 8068 | |
| 8069 | error_setg(errp, "Cannot generate a base directory for %s nodes", |
| 8070 | drv->format_name); |
| 8071 | return NULL; |
| 8072 | } |
| 8073 | |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8074 | /* |
| 8075 | * Hot add/remove a BDS's child. So the user can take a child offline when |
| 8076 | * it is broken and take a new child online |
| 8077 | */ |
| 8078 | void bdrv_add_child(BlockDriverState *parent_bs, BlockDriverState *child_bs, |
| 8079 | Error **errp) |
| 8080 | { |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 8081 | GLOBAL_STATE_CODE(); |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8082 | if (!parent_bs->drv || !parent_bs->drv->bdrv_add_child) { |
| 8083 | error_setg(errp, "The node %s does not support adding a child", |
| 8084 | bdrv_get_device_or_node_name(parent_bs)); |
| 8085 | return; |
| 8086 | } |
| 8087 | |
Sam Li | 774c726 | 2023-05-08 12:55:30 +0800 | [diff] [blame] | 8088 | /* |
| 8089 | * Non-zoned block drivers do not follow zoned storage constraints |
| 8090 | * (i.e. sequential writes to zones). Refuse mixing zoned and non-zoned |
| 8091 | * drivers in a graph. |
| 8092 | */ |
| 8093 | if (!parent_bs->drv->supports_zoned_children && |
| 8094 | child_bs->bl.zoned == BLK_Z_HM) { |
| 8095 | /* |
| 8096 | * The host-aware model allows zoned storage constraints and random |
| 8097 | * write. Allow mixing host-aware and non-zoned drivers. Using |
| 8098 | * host-aware device as a regular device. |
| 8099 | */ |
| 8100 | error_setg(errp, "Cannot add a %s child to a %s parent", |
| 8101 | child_bs->bl.zoned == BLK_Z_HM ? "zoned" : "non-zoned", |
| 8102 | parent_bs->drv->supports_zoned_children ? |
| 8103 | "support zoned children" : "not support zoned children"); |
| 8104 | return; |
| 8105 | } |
| 8106 | |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8107 | if (!QLIST_EMPTY(&child_bs->parents)) { |
| 8108 | error_setg(errp, "The node %s already has a parent", |
| 8109 | child_bs->node_name); |
| 8110 | return; |
| 8111 | } |
| 8112 | |
| 8113 | parent_bs->drv->bdrv_add_child(parent_bs, child_bs, errp); |
| 8114 | } |
| 8115 | |
| 8116 | void bdrv_del_child(BlockDriverState *parent_bs, BdrvChild *child, Error **errp) |
| 8117 | { |
| 8118 | BdrvChild *tmp; |
| 8119 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 8120 | GLOBAL_STATE_CODE(); |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 8121 | if (!parent_bs->drv || !parent_bs->drv->bdrv_del_child) { |
| 8122 | error_setg(errp, "The node %s does not support removing a child", |
| 8123 | bdrv_get_device_or_node_name(parent_bs)); |
| 8124 | return; |
| 8125 | } |
| 8126 | |
| 8127 | QLIST_FOREACH(tmp, &parent_bs->children, next) { |
| 8128 | if (tmp == child) { |
| 8129 | break; |
| 8130 | } |
| 8131 | } |
| 8132 | |
| 8133 | if (!tmp) { |
| 8134 | error_setg(errp, "The node %s does not have a child named %s", |
| 8135 | bdrv_get_device_or_node_name(parent_bs), |
| 8136 | bdrv_get_device_or_node_name(child->bs)); |
| 8137 | return; |
| 8138 | } |
| 8139 | |
| 8140 | parent_bs->drv->bdrv_del_child(parent_bs, child, errp); |
| 8141 | } |
Max Reitz | 6f7a3b5 | 2020-04-29 16:11:23 +0200 | [diff] [blame] | 8142 | |
| 8143 | int bdrv_make_empty(BdrvChild *c, Error **errp) |
| 8144 | { |
| 8145 | BlockDriver *drv = c->bs->drv; |
| 8146 | int ret; |
| 8147 | |
Emanuele Giuseppe Esposito | f791bf7 | 2022-03-03 10:15:49 -0500 | [diff] [blame] | 8148 | GLOBAL_STATE_CODE(); |
Max Reitz | 6f7a3b5 | 2020-04-29 16:11:23 +0200 | [diff] [blame] | 8149 | assert(c->perm & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)); |
| 8150 | |
| 8151 | if (!drv->bdrv_make_empty) { |
| 8152 | error_setg(errp, "%s does not support emptying nodes", |
| 8153 | drv->format_name); |
| 8154 | return -ENOTSUP; |
| 8155 | } |
| 8156 | |
| 8157 | ret = drv->bdrv_make_empty(c->bs); |
| 8158 | if (ret < 0) { |
| 8159 | error_setg_errno(errp, -ret, "Failed to empty %s", |
| 8160 | c->bs->filename); |
| 8161 | return ret; |
| 8162 | } |
| 8163 | |
| 8164 | return 0; |
| 8165 | } |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8166 | |
| 8167 | /* |
| 8168 | * Return the child that @bs acts as an overlay for, and from which data may be |
| 8169 | * copied in COW or COR operations. Usually this is the backing file. |
| 8170 | */ |
| 8171 | BdrvChild *bdrv_cow_child(BlockDriverState *bs) |
| 8172 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8173 | IO_CODE(); |
| 8174 | |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8175 | if (!bs || !bs->drv) { |
| 8176 | return NULL; |
| 8177 | } |
| 8178 | |
| 8179 | if (bs->drv->is_filter) { |
| 8180 | return NULL; |
| 8181 | } |
| 8182 | |
| 8183 | if (!bs->backing) { |
| 8184 | return NULL; |
| 8185 | } |
| 8186 | |
| 8187 | assert(bs->backing->role & BDRV_CHILD_COW); |
| 8188 | return bs->backing; |
| 8189 | } |
| 8190 | |
| 8191 | /* |
| 8192 | * If @bs acts as a filter for exactly one of its children, return |
| 8193 | * that child. |
| 8194 | */ |
| 8195 | BdrvChild *bdrv_filter_child(BlockDriverState *bs) |
| 8196 | { |
| 8197 | BdrvChild *c; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8198 | IO_CODE(); |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8199 | |
| 8200 | if (!bs || !bs->drv) { |
| 8201 | return NULL; |
| 8202 | } |
| 8203 | |
| 8204 | if (!bs->drv->is_filter) { |
| 8205 | return NULL; |
| 8206 | } |
| 8207 | |
| 8208 | /* Only one of @backing or @file may be used */ |
| 8209 | assert(!(bs->backing && bs->file)); |
| 8210 | |
| 8211 | c = bs->backing ?: bs->file; |
| 8212 | if (!c) { |
| 8213 | return NULL; |
| 8214 | } |
| 8215 | |
| 8216 | assert(c->role & BDRV_CHILD_FILTERED); |
| 8217 | return c; |
| 8218 | } |
| 8219 | |
| 8220 | /* |
| 8221 | * Return either the result of bdrv_cow_child() or bdrv_filter_child(), |
| 8222 | * whichever is non-NULL. |
| 8223 | * |
| 8224 | * Return NULL if both are NULL. |
| 8225 | */ |
| 8226 | BdrvChild *bdrv_filter_or_cow_child(BlockDriverState *bs) |
| 8227 | { |
| 8228 | BdrvChild *cow_child = bdrv_cow_child(bs); |
| 8229 | BdrvChild *filter_child = bdrv_filter_child(bs); |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8230 | IO_CODE(); |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8231 | |
| 8232 | /* Filter nodes cannot have COW backing files */ |
| 8233 | assert(!(cow_child && filter_child)); |
| 8234 | |
| 8235 | return cow_child ?: filter_child; |
| 8236 | } |
| 8237 | |
| 8238 | /* |
| 8239 | * Return the primary child of this node: For filters, that is the |
| 8240 | * filtered child. For other nodes, that is usually the child storing |
| 8241 | * metadata. |
| 8242 | * (A generally more helpful description is that this is (usually) the |
| 8243 | * child that has the same filename as @bs.) |
| 8244 | * |
| 8245 | * Drivers do not necessarily have a primary child; for example quorum |
| 8246 | * does not. |
| 8247 | */ |
| 8248 | BdrvChild *bdrv_primary_child(BlockDriverState *bs) |
| 8249 | { |
| 8250 | BdrvChild *c, *found = NULL; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8251 | IO_CODE(); |
Max Reitz | 9a6fc88 | 2019-05-31 15:23:11 +0200 | [diff] [blame] | 8252 | |
| 8253 | QLIST_FOREACH(c, &bs->children, next) { |
| 8254 | if (c->role & BDRV_CHILD_PRIMARY) { |
| 8255 | assert(!found); |
| 8256 | found = c; |
| 8257 | } |
| 8258 | } |
| 8259 | |
| 8260 | return found; |
| 8261 | } |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8262 | |
| 8263 | static BlockDriverState *bdrv_do_skip_filters(BlockDriverState *bs, |
| 8264 | bool stop_on_explicit_filter) |
| 8265 | { |
| 8266 | BdrvChild *c; |
| 8267 | |
| 8268 | if (!bs) { |
| 8269 | return NULL; |
| 8270 | } |
| 8271 | |
| 8272 | while (!(stop_on_explicit_filter && !bs->implicit)) { |
| 8273 | c = bdrv_filter_child(bs); |
| 8274 | if (!c) { |
| 8275 | /* |
| 8276 | * A filter that is embedded in a working block graph must |
| 8277 | * have a child. Assert this here so this function does |
| 8278 | * not return a filter node that is not expected by the |
| 8279 | * caller. |
| 8280 | */ |
| 8281 | assert(!bs->drv || !bs->drv->is_filter); |
| 8282 | break; |
| 8283 | } |
| 8284 | bs = c->bs; |
| 8285 | } |
| 8286 | /* |
| 8287 | * Note that this treats nodes with bs->drv == NULL as not being |
| 8288 | * filters (bs->drv == NULL should be replaced by something else |
| 8289 | * anyway). |
| 8290 | * The advantage of this behavior is that this function will thus |
| 8291 | * always return a non-NULL value (given a non-NULL @bs). |
| 8292 | */ |
| 8293 | |
| 8294 | return bs; |
| 8295 | } |
| 8296 | |
| 8297 | /* |
| 8298 | * Return the first BDS that has not been added implicitly or that |
| 8299 | * does not have a filtered child down the chain starting from @bs |
| 8300 | * (including @bs itself). |
| 8301 | */ |
| 8302 | BlockDriverState *bdrv_skip_implicit_filters(BlockDriverState *bs) |
| 8303 | { |
Emanuele Giuseppe Esposito | b4ad82a | 2022-03-03 10:15:57 -0500 | [diff] [blame] | 8304 | GLOBAL_STATE_CODE(); |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8305 | return bdrv_do_skip_filters(bs, true); |
| 8306 | } |
| 8307 | |
| 8308 | /* |
| 8309 | * Return the first BDS that does not have a filtered child down the |
| 8310 | * chain starting from @bs (including @bs itself). |
| 8311 | */ |
| 8312 | BlockDriverState *bdrv_skip_filters(BlockDriverState *bs) |
| 8313 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8314 | IO_CODE(); |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8315 | return bdrv_do_skip_filters(bs, false); |
| 8316 | } |
| 8317 | |
| 8318 | /* |
| 8319 | * For a backing chain, return the first non-filter backing image of |
| 8320 | * the first non-filter image. |
| 8321 | */ |
| 8322 | BlockDriverState *bdrv_backing_chain_next(BlockDriverState *bs) |
| 8323 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8324 | IO_CODE(); |
Max Reitz | d38d7eb | 2019-06-12 15:06:37 +0200 | [diff] [blame] | 8325 | return bdrv_skip_filters(bdrv_cow_bs(bdrv_skip_filters(bs))); |
| 8326 | } |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8327 | |
| 8328 | /** |
| 8329 | * Check whether [offset, offset + bytes) overlaps with the cached |
| 8330 | * block-status data region. |
| 8331 | * |
| 8332 | * If so, and @pnum is not NULL, set *pnum to `bsc.data_end - offset`, |
| 8333 | * which is what bdrv_bsc_is_data()'s interface needs. |
| 8334 | * Otherwise, *pnum is not touched. |
| 8335 | */ |
| 8336 | static bool bdrv_bsc_range_overlaps_locked(BlockDriverState *bs, |
| 8337 | int64_t offset, int64_t bytes, |
| 8338 | int64_t *pnum) |
| 8339 | { |
| 8340 | BdrvBlockStatusCache *bsc = qatomic_rcu_read(&bs->block_status_cache); |
| 8341 | bool overlaps; |
| 8342 | |
| 8343 | overlaps = |
| 8344 | qatomic_read(&bsc->valid) && |
| 8345 | ranges_overlap(offset, bytes, bsc->data_start, |
| 8346 | bsc->data_end - bsc->data_start); |
| 8347 | |
| 8348 | if (overlaps && pnum) { |
| 8349 | *pnum = bsc->data_end - offset; |
| 8350 | } |
| 8351 | |
| 8352 | return overlaps; |
| 8353 | } |
| 8354 | |
| 8355 | /** |
| 8356 | * See block_int.h for this function's documentation. |
| 8357 | */ |
| 8358 | bool bdrv_bsc_is_data(BlockDriverState *bs, int64_t offset, int64_t *pnum) |
| 8359 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8360 | IO_CODE(); |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8361 | RCU_READ_LOCK_GUARD(); |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8362 | return bdrv_bsc_range_overlaps_locked(bs, offset, 1, pnum); |
| 8363 | } |
| 8364 | |
| 8365 | /** |
| 8366 | * See block_int.h for this function's documentation. |
| 8367 | */ |
| 8368 | void bdrv_bsc_invalidate_range(BlockDriverState *bs, |
| 8369 | int64_t offset, int64_t bytes) |
| 8370 | { |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8371 | IO_CODE(); |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8372 | RCU_READ_LOCK_GUARD(); |
| 8373 | |
| 8374 | if (bdrv_bsc_range_overlaps_locked(bs, offset, bytes, NULL)) { |
| 8375 | qatomic_set(&bs->block_status_cache->valid, false); |
| 8376 | } |
| 8377 | } |
| 8378 | |
| 8379 | /** |
| 8380 | * See block_int.h for this function's documentation. |
| 8381 | */ |
| 8382 | void bdrv_bsc_fill(BlockDriverState *bs, int64_t offset, int64_t bytes) |
| 8383 | { |
| 8384 | BdrvBlockStatusCache *new_bsc = g_new(BdrvBlockStatusCache, 1); |
| 8385 | BdrvBlockStatusCache *old_bsc; |
Emanuele Giuseppe Esposito | 967d790 | 2022-03-03 10:15:58 -0500 | [diff] [blame] | 8386 | IO_CODE(); |
Hanna Reitz | 0bc329f | 2021-08-12 10:41:44 +0200 | [diff] [blame] | 8387 | |
| 8388 | *new_bsc = (BdrvBlockStatusCache) { |
| 8389 | .valid = true, |
| 8390 | .data_start = offset, |
| 8391 | .data_end = offset + bytes, |
| 8392 | }; |
| 8393 | |
| 8394 | QEMU_LOCK_GUARD(&bs->bsc_modify_lock); |
| 8395 | |
| 8396 | old_bsc = qatomic_rcu_read(&bs->block_status_cache); |
| 8397 | qatomic_rcu_set(&bs->block_status_cache, new_bsc); |
| 8398 | if (old_bsc) { |
| 8399 | g_free_rcu(old_bsc, rcu); |
| 8400 | } |
| 8401 | } |