Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Block layer snapshot related functions |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
| 24 | |
Peter Maydell | 80c71a2 | 2016-01-18 18:01:42 +0000 | [diff] [blame] | 25 | #include "qemu/osdep.h" |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 26 | #include "block/snapshot.h" |
| 27 | #include "block/block_int.h" |
Max Reitz | 609f45e | 2018-06-14 21:14:28 +0200 | [diff] [blame] | 28 | #include "block/qdict.h" |
Markus Armbruster | da34e65 | 2016-03-14 09:01:28 +0100 | [diff] [blame] | 29 | #include "qapi/error.h" |
Markus Armbruster | 452fcdb | 2018-02-01 12:18:39 +0100 | [diff] [blame] | 30 | #include "qapi/qmp/qdict.h" |
Dong Jia Shi | 7a9e511 | 2017-04-05 11:19:09 +0200 | [diff] [blame] | 31 | #include "qapi/qmp/qstring.h" |
Markus Armbruster | 922a01a | 2018-02-01 12:18:46 +0100 | [diff] [blame] | 32 | #include "qemu/option.h" |
Kevin Wolf | 05f4ace | 2019-09-17 12:26:23 +0200 | [diff] [blame] | 33 | #include "sysemu/block-backend.h" |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 34 | |
Wenchao Xia | 8c116b0 | 2013-12-04 17:10:55 +0800 | [diff] [blame] | 35 | QemuOptsList internal_snapshot_opts = { |
| 36 | .name = "snapshot", |
| 37 | .head = QTAILQ_HEAD_INITIALIZER(internal_snapshot_opts.head), |
| 38 | .desc = { |
| 39 | { |
| 40 | .name = SNAPSHOT_OPT_ID, |
| 41 | .type = QEMU_OPT_STRING, |
| 42 | .help = "snapshot id" |
| 43 | },{ |
| 44 | .name = SNAPSHOT_OPT_NAME, |
| 45 | .type = QEMU_OPT_STRING, |
| 46 | .help = "snapshot name" |
| 47 | },{ |
| 48 | /* end of list */ |
| 49 | } |
| 50 | }, |
| 51 | }; |
| 52 | |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 53 | int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info, |
| 54 | const char *name) |
| 55 | { |
| 56 | QEMUSnapshotInfo *sn_tab, *sn; |
| 57 | int nb_sns, i, ret; |
| 58 | |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 59 | GLOBAL_STATE_CODE(); |
| 60 | |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 61 | ret = -ENOENT; |
| 62 | nb_sns = bdrv_snapshot_list(bs, &sn_tab); |
| 63 | if (nb_sns < 0) { |
| 64 | return ret; |
| 65 | } |
| 66 | for (i = 0; i < nb_sns; i++) { |
| 67 | sn = &sn_tab[i]; |
Daniel Henrique Barboza | 6ca0804 | 2018-11-07 11:09:58 -0200 | [diff] [blame] | 68 | if (!strcmp(sn->name, name)) { |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 69 | *sn_info = *sn; |
| 70 | ret = 0; |
| 71 | break; |
| 72 | } |
| 73 | } |
| 74 | g_free(sn_tab); |
| 75 | return ret; |
| 76 | } |
| 77 | |
Wenchao Xia | 2ea1dd7 | 2013-09-11 14:04:32 +0800 | [diff] [blame] | 78 | /** |
| 79 | * Look up an internal snapshot by @id and @name. |
| 80 | * @bs: block device to search |
| 81 | * @id: unique snapshot ID, or NULL |
| 82 | * @name: snapshot name, or NULL |
| 83 | * @sn_info: location to store information on the snapshot found |
| 84 | * @errp: location to store error, will be set only for exception |
| 85 | * |
| 86 | * This function will traverse snapshot list in @bs to search the matching |
| 87 | * one, @id and @name are the matching condition: |
| 88 | * If both @id and @name are specified, find the first one with id @id and |
| 89 | * name @name. |
| 90 | * If only @id is specified, find the first one with id @id. |
| 91 | * If only @name is specified, find the first one with name @name. |
| 92 | * if none is specified, abort(). |
| 93 | * |
| 94 | * Returns: true when a snapshot is found and @sn_info will be filled, false |
| 95 | * when error or not found. If all operation succeed but no matching one is |
| 96 | * found, @errp will NOT be set. |
| 97 | */ |
| 98 | bool bdrv_snapshot_find_by_id_and_name(BlockDriverState *bs, |
| 99 | const char *id, |
| 100 | const char *name, |
| 101 | QEMUSnapshotInfo *sn_info, |
| 102 | Error **errp) |
| 103 | { |
| 104 | QEMUSnapshotInfo *sn_tab, *sn; |
| 105 | int nb_sns, i; |
| 106 | bool ret = false; |
| 107 | |
| 108 | assert(id || name); |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 109 | GLOBAL_STATE_CODE(); |
Wenchao Xia | 2ea1dd7 | 2013-09-11 14:04:32 +0800 | [diff] [blame] | 110 | |
| 111 | nb_sns = bdrv_snapshot_list(bs, &sn_tab); |
| 112 | if (nb_sns < 0) { |
| 113 | error_setg_errno(errp, -nb_sns, "Failed to get a snapshot list"); |
| 114 | return false; |
| 115 | } else if (nb_sns == 0) { |
| 116 | return false; |
| 117 | } |
| 118 | |
| 119 | if (id && name) { |
| 120 | for (i = 0; i < nb_sns; i++) { |
| 121 | sn = &sn_tab[i]; |
| 122 | if (!strcmp(sn->id_str, id) && !strcmp(sn->name, name)) { |
| 123 | *sn_info = *sn; |
| 124 | ret = true; |
| 125 | break; |
| 126 | } |
| 127 | } |
| 128 | } else if (id) { |
| 129 | for (i = 0; i < nb_sns; i++) { |
| 130 | sn = &sn_tab[i]; |
| 131 | if (!strcmp(sn->id_str, id)) { |
| 132 | *sn_info = *sn; |
| 133 | ret = true; |
| 134 | break; |
| 135 | } |
| 136 | } |
| 137 | } else if (name) { |
| 138 | for (i = 0; i < nb_sns; i++) { |
| 139 | sn = &sn_tab[i]; |
| 140 | if (!strcmp(sn->name, name)) { |
| 141 | *sn_info = *sn; |
| 142 | ret = true; |
| 143 | break; |
| 144 | } |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | g_free(sn_tab); |
| 149 | return ret; |
| 150 | } |
| 151 | |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 152 | /** |
Vladimir Sementsov-Ogievskiy | c5c2174 | 2022-07-26 23:11:33 +0300 | [diff] [blame] | 153 | * Return a pointer to child of given BDS to which we can fall |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 154 | * back if the given BDS does not support snapshots. |
| 155 | * Return NULL if there is no BDS to (safely) fall back to. |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 156 | */ |
Kevin Wolf | a32e781 | 2023-09-29 16:51:42 +0200 | [diff] [blame] | 157 | static BdrvChild * GRAPH_RDLOCK |
| 158 | bdrv_snapshot_fallback_child(BlockDriverState *bs) |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 159 | { |
Vladimir Sementsov-Ogievskiy | c5c2174 | 2022-07-26 23:11:33 +0300 | [diff] [blame] | 160 | BdrvChild *fallback = bdrv_primary_child(bs); |
| 161 | BdrvChild *child; |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 162 | |
Kevin Wolf | a32e781 | 2023-09-29 16:51:42 +0200 | [diff] [blame] | 163 | GLOBAL_STATE_CODE(); |
| 164 | assert_bdrv_graph_readable(); |
| 165 | |
Vladimir Sementsov-Ogievskiy | 0c6100a | 2022-07-26 23:11:27 +0300 | [diff] [blame] | 166 | /* We allow fallback only to primary child */ |
Vladimir Sementsov-Ogievskiy | c5c2174 | 2022-07-26 23:11:33 +0300 | [diff] [blame] | 167 | if (!fallback) { |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 168 | return NULL; |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * Check that there are no other children that would need to be |
| 173 | * snapshotted. If there are, it is not safe to fall back to |
Vladimir Sementsov-Ogievskiy | c5c2174 | 2022-07-26 23:11:33 +0300 | [diff] [blame] | 174 | * fallback. |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 175 | */ |
| 176 | QLIST_FOREACH(child, &bs->children, next) { |
| 177 | if (child->role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA | |
| 178 | BDRV_CHILD_FILTERED) && |
Vladimir Sementsov-Ogievskiy | c5c2174 | 2022-07-26 23:11:33 +0300 | [diff] [blame] | 179 | child != fallback) |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 180 | { |
| 181 | return NULL; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | return fallback; |
| 186 | } |
| 187 | |
Kevin Wolf | a32e781 | 2023-09-29 16:51:42 +0200 | [diff] [blame] | 188 | static BlockDriverState * GRAPH_RDLOCK |
| 189 | bdrv_snapshot_fallback(BlockDriverState *bs) |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 190 | { |
Kevin Wolf | a32e781 | 2023-09-29 16:51:42 +0200 | [diff] [blame] | 191 | GLOBAL_STATE_CODE(); |
Vladimir Sementsov-Ogievskiy | c5c2174 | 2022-07-26 23:11:33 +0300 | [diff] [blame] | 192 | return child_bs(bdrv_snapshot_fallback_child(bs)); |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 193 | } |
| 194 | |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 195 | int bdrv_can_snapshot(BlockDriverState *bs) |
| 196 | { |
| 197 | BlockDriver *drv = bs->drv; |
Kevin Wolf | d3007d3 | 2023-12-01 15:25:18 +0100 | [diff] [blame] | 198 | |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 199 | GLOBAL_STATE_CODE(); |
Kevin Wolf | d3007d3 | 2023-12-01 15:25:18 +0100 | [diff] [blame] | 200 | |
| 201 | if (!drv || !bdrv_is_inserted(bs) || !bdrv_is_writable(bs)) { |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | if (!drv->bdrv_snapshot_create) { |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 206 | BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs); |
| 207 | if (fallback_bs) { |
| 208 | return bdrv_can_snapshot(fallback_bs); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 209 | } |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | return 1; |
| 214 | } |
| 215 | |
| 216 | int bdrv_snapshot_create(BlockDriverState *bs, |
| 217 | QEMUSnapshotInfo *sn_info) |
| 218 | { |
| 219 | BlockDriver *drv = bs->drv; |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 220 | BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs); |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 221 | |
| 222 | GLOBAL_STATE_CODE(); |
| 223 | |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 224 | if (!drv) { |
| 225 | return -ENOMEDIUM; |
| 226 | } |
| 227 | if (drv->bdrv_snapshot_create) { |
| 228 | return drv->bdrv_snapshot_create(bs, sn_info); |
| 229 | } |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 230 | if (fallback_bs) { |
| 231 | return bdrv_snapshot_create(fallback_bs, sn_info); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 232 | } |
| 233 | return -ENOTSUP; |
| 234 | } |
| 235 | |
| 236 | int bdrv_snapshot_goto(BlockDriverState *bs, |
Kevin Wolf | 0b62bcb | 2017-11-20 15:28:41 +0100 | [diff] [blame] | 237 | const char *snapshot_id, |
| 238 | Error **errp) |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 239 | { |
| 240 | BlockDriver *drv = bs->drv; |
Vladimir Sementsov-Ogievskiy | c5c2174 | 2022-07-26 23:11:33 +0300 | [diff] [blame] | 241 | BdrvChild *fallback; |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 242 | int ret, open_ret; |
| 243 | |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 244 | GLOBAL_STATE_CODE(); |
| 245 | |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 246 | if (!drv) { |
Kevin Wolf | 0b62bcb | 2017-11-20 15:28:41 +0100 | [diff] [blame] | 247 | error_setg(errp, "Block driver is closed"); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 248 | return -ENOMEDIUM; |
| 249 | } |
Vladimir Sementsov-Ogievskiy | 04dec3c | 2017-10-23 12:29:45 +0300 | [diff] [blame] | 250 | |
Kevin Wolf | 70a5afe | 2017-11-20 15:41:31 +0100 | [diff] [blame] | 251 | if (!QLIST_EMPTY(&bs->dirty_bitmaps)) { |
| 252 | error_setg(errp, "Device has active dirty bitmaps"); |
| 253 | return -EBUSY; |
Vladimir Sementsov-Ogievskiy | 04dec3c | 2017-10-23 12:29:45 +0300 | [diff] [blame] | 254 | } |
Vladimir Sementsov-Ogievskiy | 04dec3c | 2017-10-23 12:29:45 +0300 | [diff] [blame] | 255 | |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 256 | if (drv->bdrv_snapshot_goto) { |
Kevin Wolf | 0b62bcb | 2017-11-20 15:28:41 +0100 | [diff] [blame] | 257 | ret = drv->bdrv_snapshot_goto(bs, snapshot_id); |
| 258 | if (ret < 0) { |
| 259 | error_setg_errno(errp, -ret, "Failed to load snapshot"); |
| 260 | } |
| 261 | return ret; |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 262 | } |
| 263 | |
Kevin Wolf | a32e781 | 2023-09-29 16:51:42 +0200 | [diff] [blame] | 264 | bdrv_graph_rdlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | c5c2174 | 2022-07-26 23:11:33 +0300 | [diff] [blame] | 265 | fallback = bdrv_snapshot_fallback_child(bs); |
Kevin Wolf | a32e781 | 2023-09-29 16:51:42 +0200 | [diff] [blame] | 266 | bdrv_graph_rdunlock_main_loop(); |
| 267 | |
Vladimir Sementsov-Ogievskiy | c5c2174 | 2022-07-26 23:11:33 +0300 | [diff] [blame] | 268 | if (fallback) { |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 269 | QDict *options; |
Dong Jia Shi | 7a9e511 | 2017-04-05 11:19:09 +0200 | [diff] [blame] | 270 | QDict *file_options; |
Kevin Wolf | 0b62bcb | 2017-11-20 15:28:41 +0100 | [diff] [blame] | 271 | Error *local_err = NULL; |
Vladimir Sementsov-Ogievskiy | c5c2174 | 2022-07-26 23:11:33 +0300 | [diff] [blame] | 272 | BlockDriverState *fallback_bs = fallback->bs; |
| 273 | char *subqdict_prefix = g_strdup_printf("%s.", fallback->name); |
Dong Jia Shi | 7a9e511 | 2017-04-05 11:19:09 +0200 | [diff] [blame] | 274 | |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 275 | options = qdict_clone_shallow(bs->options); |
| 276 | |
Dong Jia Shi | 7a9e511 | 2017-04-05 11:19:09 +0200 | [diff] [blame] | 277 | /* Prevent it from getting deleted when detached from bs */ |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 278 | bdrv_ref(fallback_bs); |
Dong Jia Shi | 7a9e511 | 2017-04-05 11:19:09 +0200 | [diff] [blame] | 279 | |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 280 | qdict_extract_subqdict(options, &file_options, subqdict_prefix); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 281 | qobject_unref(file_options); |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 282 | g_free(subqdict_prefix); |
| 283 | |
Vladimir Sementsov-Ogievskiy | c5c2174 | 2022-07-26 23:11:33 +0300 | [diff] [blame] | 284 | /* Force .bdrv_open() below to re-attach fallback_bs on fallback */ |
| 285 | qdict_put_str(options, fallback->name, |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 286 | bdrv_get_node_name(fallback_bs)); |
Dong Jia Shi | 7a9e511 | 2017-04-05 11:19:09 +0200 | [diff] [blame] | 287 | |
Max Reitz | 32a9a24 | 2021-05-03 02:54:18 -0700 | [diff] [blame] | 288 | /* Now close bs, apply the snapshot on fallback_bs, and re-open bs */ |
Vladimir Sementsov-Ogievskiy | 3c00529 | 2018-08-14 15:43:19 +0300 | [diff] [blame] | 289 | if (drv->bdrv_close) { |
| 290 | drv->bdrv_close(bs); |
| 291 | } |
Dong Jia Shi | 7a9e511 | 2017-04-05 11:19:09 +0200 | [diff] [blame] | 292 | |
Max Reitz | 32a9a24 | 2021-05-03 02:54:18 -0700 | [diff] [blame] | 293 | /* .bdrv_open() will re-attach it */ |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 294 | bdrv_graph_wrlock(); |
Vladimir Sementsov-Ogievskiy | c5c2174 | 2022-07-26 23:11:33 +0300 | [diff] [blame] | 295 | bdrv_unref_child(bs, fallback); |
Stefan Hajnoczi | 6bc30f1 | 2023-12-05 13:20:02 -0500 | [diff] [blame] | 296 | bdrv_graph_wrunlock(); |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 297 | |
| 298 | ret = bdrv_snapshot_goto(fallback_bs, snapshot_id, errp); |
Kevin Wolf | 0b62bcb | 2017-11-20 15:28:41 +0100 | [diff] [blame] | 299 | open_ret = drv->bdrv_open(bs, options, bs->open_flags, &local_err); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 300 | qobject_unref(options); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 301 | if (open_ret < 0) { |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 302 | bdrv_unref(fallback_bs); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 303 | bs->drv = NULL; |
Kevin Wolf | 0b62bcb | 2017-11-20 15:28:41 +0100 | [diff] [blame] | 304 | /* A bdrv_snapshot_goto() error takes precedence */ |
| 305 | error_propagate(errp, local_err); |
| 306 | return ret < 0 ? ret : open_ret; |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 307 | } |
Dong Jia Shi | 7a9e511 | 2017-04-05 11:19:09 +0200 | [diff] [blame] | 308 | |
Max Reitz | 32a9a24 | 2021-05-03 02:54:18 -0700 | [diff] [blame] | 309 | /* |
Vladimir Sementsov-Ogievskiy | 0c6100a | 2022-07-26 23:11:27 +0300 | [diff] [blame] | 310 | * fallback was a primary child. It was closed above and set to NULL, |
| 311 | * but the .bdrv_open() call has opened it again, because we set the |
| 312 | * respective option (with the qdict_put_str() call above). |
| 313 | * Assert that .bdrv_open() has attached the right BDS as primary child. |
Max Reitz | 32a9a24 | 2021-05-03 02:54:18 -0700 | [diff] [blame] | 314 | */ |
Kevin Wolf | c0fc512 | 2023-09-29 16:51:46 +0200 | [diff] [blame] | 315 | bdrv_graph_rdlock_main_loop(); |
Vladimir Sementsov-Ogievskiy | 0c6100a | 2022-07-26 23:11:27 +0300 | [diff] [blame] | 316 | assert(bdrv_primary_bs(bs) == fallback_bs); |
Kevin Wolf | c0fc512 | 2023-09-29 16:51:46 +0200 | [diff] [blame] | 317 | bdrv_graph_rdunlock_main_loop(); |
| 318 | |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 319 | bdrv_unref(fallback_bs); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 320 | return ret; |
| 321 | } |
| 322 | |
Kevin Wolf | 0b62bcb | 2017-11-20 15:28:41 +0100 | [diff] [blame] | 323 | error_setg(errp, "Block driver does not support snapshots"); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 324 | return -ENOTSUP; |
| 325 | } |
| 326 | |
Wenchao Xia | a89d89d | 2013-09-11 14:04:33 +0800 | [diff] [blame] | 327 | /** |
| 328 | * Delete an internal snapshot by @snapshot_id and @name. |
| 329 | * @bs: block device used in the operation |
| 330 | * @snapshot_id: unique snapshot ID, or NULL |
| 331 | * @name: snapshot name, or NULL |
| 332 | * @errp: location to store error |
| 333 | * |
| 334 | * If both @snapshot_id and @name are specified, delete the first one with |
| 335 | * id @snapshot_id and name @name. |
| 336 | * If only @snapshot_id is specified, delete the first one with id |
| 337 | * @snapshot_id. |
| 338 | * If only @name is specified, delete the first one with name @name. |
Wenchao Xia | 7b4c478 | 2013-12-04 17:10:54 +0800 | [diff] [blame] | 339 | * if none is specified, return -EINVAL. |
Wenchao Xia | a89d89d | 2013-09-11 14:04:33 +0800 | [diff] [blame] | 340 | * |
| 341 | * Returns: 0 on success, -errno on failure. If @bs is not inserted, return |
| 342 | * -ENOMEDIUM. If @snapshot_id and @name are both NULL, return -EINVAL. If @bs |
| 343 | * does not support internal snapshot deletion, return -ENOTSUP. If @bs does |
| 344 | * not support parameter @snapshot_id or @name, or one of them is not correctly |
| 345 | * specified, return -EINVAL. If @bs can't find one matching @id and @name, |
| 346 | * return -ENOENT. If @errp != NULL, it will always be filled with error |
| 347 | * message on failure. |
| 348 | */ |
| 349 | int bdrv_snapshot_delete(BlockDriverState *bs, |
| 350 | const char *snapshot_id, |
| 351 | const char *name, |
| 352 | Error **errp) |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 353 | { |
| 354 | BlockDriver *drv = bs->drv; |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 355 | BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs); |
Paolo Bonzini | 27a7649 | 2015-12-16 19:33:45 +0100 | [diff] [blame] | 356 | int ret; |
| 357 | |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 358 | GLOBAL_STATE_CODE(); |
| 359 | |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 360 | if (!drv) { |
Philippe Mathieu-Daudé | a95921f | 2024-03-12 15:13:36 +0100 | [diff] [blame] | 361 | error_setg(errp, "Device '%s' has no medium", |
| 362 | bdrv_get_device_name(bs)); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 363 | return -ENOMEDIUM; |
| 364 | } |
Wenchao Xia | a89d89d | 2013-09-11 14:04:33 +0800 | [diff] [blame] | 365 | if (!snapshot_id && !name) { |
| 366 | error_setg(errp, "snapshot_id and name are both NULL"); |
| 367 | return -EINVAL; |
| 368 | } |
Zhang Haoyu | 3432a19 | 2014-10-21 16:38:01 +0800 | [diff] [blame] | 369 | |
| 370 | /* drain all pending i/o before deleting snapshot */ |
Paolo Bonzini | 27a7649 | 2015-12-16 19:33:45 +0100 | [diff] [blame] | 371 | bdrv_drained_begin(bs); |
Zhang Haoyu | 3432a19 | 2014-10-21 16:38:01 +0800 | [diff] [blame] | 372 | |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 373 | if (drv->bdrv_snapshot_delete) { |
Paolo Bonzini | 27a7649 | 2015-12-16 19:33:45 +0100 | [diff] [blame] | 374 | ret = drv->bdrv_snapshot_delete(bs, snapshot_id, name, errp); |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 375 | } else if (fallback_bs) { |
| 376 | ret = bdrv_snapshot_delete(fallback_bs, snapshot_id, name, errp); |
Paolo Bonzini | 27a7649 | 2015-12-16 19:33:45 +0100 | [diff] [blame] | 377 | } else { |
| 378 | error_setg(errp, "Block format '%s' used by device '%s' " |
| 379 | "does not support internal snapshot deletion", |
| 380 | drv->format_name, bdrv_get_device_name(bs)); |
| 381 | ret = -ENOTSUP; |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 382 | } |
Paolo Bonzini | 27a7649 | 2015-12-16 19:33:45 +0100 | [diff] [blame] | 383 | |
| 384 | bdrv_drained_end(bs); |
| 385 | return ret; |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 386 | } |
| 387 | |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 388 | int bdrv_snapshot_list(BlockDriverState *bs, |
| 389 | QEMUSnapshotInfo **psn_info) |
| 390 | { |
Kevin Wolf | a32e781 | 2023-09-29 16:51:42 +0200 | [diff] [blame] | 391 | GLOBAL_STATE_CODE(); |
| 392 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 393 | |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 394 | BlockDriver *drv = bs->drv; |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 395 | BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs); |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 396 | |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 397 | if (!drv) { |
| 398 | return -ENOMEDIUM; |
| 399 | } |
| 400 | if (drv->bdrv_snapshot_list) { |
| 401 | return drv->bdrv_snapshot_list(bs, psn_info); |
| 402 | } |
Max Reitz | c8af875 | 2019-06-12 18:21:07 +0200 | [diff] [blame] | 403 | if (fallback_bs) { |
| 404 | return bdrv_snapshot_list(fallback_bs, psn_info); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 405 | } |
| 406 | return -ENOTSUP; |
| 407 | } |
| 408 | |
Wenchao Xia | 7b4c478 | 2013-12-04 17:10:54 +0800 | [diff] [blame] | 409 | /** |
| 410 | * Temporarily load an internal snapshot by @snapshot_id and @name. |
| 411 | * @bs: block device used in the operation |
| 412 | * @snapshot_id: unique snapshot ID, or NULL |
| 413 | * @name: snapshot name, or NULL |
| 414 | * @errp: location to store error |
| 415 | * |
| 416 | * If both @snapshot_id and @name are specified, load the first one with |
| 417 | * id @snapshot_id and name @name. |
| 418 | * If only @snapshot_id is specified, load the first one with id |
| 419 | * @snapshot_id. |
| 420 | * If only @name is specified, load the first one with name @name. |
| 421 | * if none is specified, return -EINVAL. |
| 422 | * |
| 423 | * Returns: 0 on success, -errno on fail. If @bs is not inserted, return |
| 424 | * -ENOMEDIUM. If @bs is not readonly, return -EINVAL. If @bs did not support |
| 425 | * internal snapshot, return -ENOTSUP. If qemu can't find a matching @id and |
| 426 | * @name, return -ENOENT. If @errp != NULL, it will always be filled on |
| 427 | * failure. |
| 428 | */ |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 429 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, |
Wenchao Xia | 7b4c478 | 2013-12-04 17:10:54 +0800 | [diff] [blame] | 430 | const char *snapshot_id, |
| 431 | const char *name, |
| 432 | Error **errp) |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 433 | { |
| 434 | BlockDriver *drv = bs->drv; |
Wenchao Xia | 7b4c478 | 2013-12-04 17:10:54 +0800 | [diff] [blame] | 435 | |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 436 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 4026f1c | 2023-09-29 16:51:47 +0200 | [diff] [blame] | 437 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 438 | |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 439 | if (!drv) { |
Philippe Mathieu-Daudé | a95921f | 2024-03-12 15:13:36 +0100 | [diff] [blame] | 440 | error_setg(errp, "Device '%s' has no medium", |
| 441 | bdrv_get_device_name(bs)); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 442 | return -ENOMEDIUM; |
| 443 | } |
Wenchao Xia | 7b4c478 | 2013-12-04 17:10:54 +0800 | [diff] [blame] | 444 | if (!snapshot_id && !name) { |
| 445 | error_setg(errp, "snapshot_id and name are both NULL"); |
| 446 | return -EINVAL; |
| 447 | } |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 448 | if (!bdrv_is_read_only(bs)) { |
Wenchao Xia | 7b4c478 | 2013-12-04 17:10:54 +0800 | [diff] [blame] | 449 | error_setg(errp, "Device is not readonly"); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 450 | return -EINVAL; |
| 451 | } |
| 452 | if (drv->bdrv_snapshot_load_tmp) { |
Wenchao Xia | 7b4c478 | 2013-12-04 17:10:54 +0800 | [diff] [blame] | 453 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_id, name, errp); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 454 | } |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 455 | error_setg(errp, "Block format '%s' used by device '%s' " |
| 456 | "does not support temporarily loading internal snapshots", |
| 457 | drv->format_name, bdrv_get_device_name(bs)); |
Wenchao Xia | de08c60 | 2013-05-25 11:09:43 +0800 | [diff] [blame] | 458 | return -ENOTSUP; |
| 459 | } |
Wenchao Xia | 7b4c478 | 2013-12-04 17:10:54 +0800 | [diff] [blame] | 460 | |
| 461 | int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs, |
| 462 | const char *id_or_name, |
| 463 | Error **errp) |
| 464 | { |
| 465 | int ret; |
| 466 | Error *local_err = NULL; |
| 467 | |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 468 | GLOBAL_STATE_CODE(); |
| 469 | |
Wenchao Xia | 7b4c478 | 2013-12-04 17:10:54 +0800 | [diff] [blame] | 470 | ret = bdrv_snapshot_load_tmp(bs, id_or_name, NULL, &local_err); |
| 471 | if (ret == -ENOENT || ret == -EINVAL) { |
| 472 | error_free(local_err); |
| 473 | local_err = NULL; |
| 474 | ret = bdrv_snapshot_load_tmp(bs, NULL, id_or_name, &local_err); |
| 475 | } |
| 476 | |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 477 | error_propagate(errp, local_err); |
Wenchao Xia | 7b4c478 | 2013-12-04 17:10:54 +0800 | [diff] [blame] | 478 | |
| 479 | return ret; |
| 480 | } |
Denis V. Lunev | e9ff957 | 2015-11-19 09:42:01 +0300 | [diff] [blame] | 481 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 482 | |
Kevin Wolf | 2b3912f | 2023-09-29 16:51:39 +0200 | [diff] [blame] | 483 | static int GRAPH_RDLOCK |
| 484 | bdrv_all_get_snapshot_devices(bool has_devices, strList *devices, |
| 485 | GList **all_bdrvs, Error **errp) |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 486 | { |
| 487 | g_autoptr(GList) bdrvs = NULL; |
| 488 | |
| 489 | if (has_devices) { |
| 490 | if (!devices) { |
| 491 | error_setg(errp, "At least one device is required for snapshot"); |
| 492 | return -1; |
| 493 | } |
| 494 | |
| 495 | while (devices) { |
| 496 | BlockDriverState *bs = bdrv_find_node(devices->value); |
| 497 | if (!bs) { |
| 498 | error_setg(errp, "No block device node '%s'", devices->value); |
| 499 | return -1; |
| 500 | } |
| 501 | bdrvs = g_list_append(bdrvs, bs); |
| 502 | devices = devices->next; |
| 503 | } |
| 504 | } else { |
| 505 | BlockDriverState *bs; |
| 506 | BdrvNextIterator it; |
| 507 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
| 508 | bdrvs = g_list_append(bdrvs, bs); |
| 509 | } |
| 510 | } |
| 511 | |
| 512 | *all_bdrvs = g_steal_pointer(&bdrvs); |
| 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | |
Kevin Wolf | 2b3912f | 2023-09-29 16:51:39 +0200 | [diff] [blame] | 517 | static bool GRAPH_RDLOCK bdrv_all_snapshots_includes_bs(BlockDriverState *bs) |
Kevin Wolf | 05f4ace | 2019-09-17 12:26:23 +0200 | [diff] [blame] | 518 | { |
Kevin Wolf | a32e781 | 2023-09-29 16:51:42 +0200 | [diff] [blame] | 519 | GLOBAL_STATE_CODE(); |
| 520 | assert_bdrv_graph_readable(); |
| 521 | |
Kevin Wolf | 05f4ace | 2019-09-17 12:26:23 +0200 | [diff] [blame] | 522 | if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
| 523 | return false; |
| 524 | } |
| 525 | |
| 526 | /* Include all nodes that are either in use by a BlockBackend, or that |
| 527 | * aren't attached to any node, but owned by the monitor. */ |
| 528 | return bdrv_has_blk(bs) || QLIST_EMPTY(&bs->parents); |
| 529 | } |
Denis V. Lunev | e9ff957 | 2015-11-19 09:42:01 +0300 | [diff] [blame] | 530 | |
Stefan Hajnoczi | b49f475 | 2023-12-05 13:20:03 -0500 | [diff] [blame] | 531 | /* Group operations. All block drivers are involved. */ |
Denis V. Lunev | e9ff957 | 2015-11-19 09:42:01 +0300 | [diff] [blame] | 532 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 533 | bool bdrv_all_can_snapshot(bool has_devices, strList *devices, |
| 534 | Error **errp) |
Denis V. Lunev | e9ff957 | 2015-11-19 09:42:01 +0300 | [diff] [blame] | 535 | { |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 536 | g_autoptr(GList) bdrvs = NULL; |
| 537 | GList *iterbdrvs; |
Denis V. Lunev | e9ff957 | 2015-11-19 09:42:01 +0300 | [diff] [blame] | 538 | |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 539 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 2b3912f | 2023-09-29 16:51:39 +0200 | [diff] [blame] | 540 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 541 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 542 | if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { |
| 543 | return false; |
| 544 | } |
| 545 | |
| 546 | iterbdrvs = bdrvs; |
| 547 | while (iterbdrvs) { |
| 548 | BlockDriverState *bs = iterbdrvs->data; |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 549 | bool ok = true; |
Denis V. Lunev | e9ff957 | 2015-11-19 09:42:01 +0300 | [diff] [blame] | 550 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 551 | if (devices || bdrv_all_snapshots_includes_bs(bs)) { |
Denis V. Lunev | e9ff957 | 2015-11-19 09:42:01 +0300 | [diff] [blame] | 552 | ok = bdrv_can_snapshot(bs); |
| 553 | } |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 554 | if (!ok) { |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 555 | error_setg(errp, "Device '%s' is writable but does not support " |
| 556 | "snapshots", bdrv_get_device_or_node_name(bs)); |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 557 | return false; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 558 | } |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 559 | |
| 560 | iterbdrvs = iterbdrvs->next; |
Denis V. Lunev | e9ff957 | 2015-11-19 09:42:01 +0300 | [diff] [blame] | 561 | } |
| 562 | |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 563 | return true; |
Denis V. Lunev | e9ff957 | 2015-11-19 09:42:01 +0300 | [diff] [blame] | 564 | } |
Denis V. Lunev | 9b00ea3 | 2015-11-19 09:42:03 +0300 | [diff] [blame] | 565 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 566 | int bdrv_all_delete_snapshot(const char *name, |
| 567 | bool has_devices, strList *devices, |
| 568 | Error **errp) |
Denis V. Lunev | 9b00ea3 | 2015-11-19 09:42:03 +0300 | [diff] [blame] | 569 | { |
Zhao Liu | ce33d85 | 2024-03-11 11:38:03 +0800 | [diff] [blame] | 570 | ERRP_GUARD(); |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 571 | g_autoptr(GList) bdrvs = NULL; |
| 572 | GList *iterbdrvs; |
Denis V. Lunev | 9b00ea3 | 2015-11-19 09:42:03 +0300 | [diff] [blame] | 573 | |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 574 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 2b3912f | 2023-09-29 16:51:39 +0200 | [diff] [blame] | 575 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 576 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 577 | if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { |
| 578 | return -1; |
| 579 | } |
| 580 | |
| 581 | iterbdrvs = bdrvs; |
| 582 | while (iterbdrvs) { |
| 583 | BlockDriverState *bs = iterbdrvs->data; |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 584 | QEMUSnapshotInfo sn1, *snapshot = &sn1; |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 585 | int ret = 0; |
Denis V. Lunev | 9b00ea3 | 2015-11-19 09:42:03 +0300 | [diff] [blame] | 586 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 587 | if ((devices || bdrv_all_snapshots_includes_bs(bs)) && |
Kevin Wolf | 05f4ace | 2019-09-17 12:26:23 +0200 | [diff] [blame] | 588 | bdrv_snapshot_find(bs, snapshot, name) >= 0) |
| 589 | { |
Daniel Henrique Barboza | 6ca0804 | 2018-11-07 11:09:58 -0200 | [diff] [blame] | 590 | ret = bdrv_snapshot_delete(bs, snapshot->id_str, |
Vladimir Sementsov-Ogievskiy | e53a578 | 2019-12-05 20:46:24 +0300 | [diff] [blame] | 591 | snapshot->name, errp); |
Denis V. Lunev | 9b00ea3 | 2015-11-19 09:42:03 +0300 | [diff] [blame] | 592 | } |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 593 | if (ret < 0) { |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 594 | error_prepend(errp, "Could not delete snapshot '%s' on '%s': ", |
| 595 | name, bdrv_get_device_or_node_name(bs)); |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 596 | return -1; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 597 | } |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 598 | |
| 599 | iterbdrvs = iterbdrvs->next; |
Denis V. Lunev | 9b00ea3 | 2015-11-19 09:42:03 +0300 | [diff] [blame] | 600 | } |
| 601 | |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 602 | return 0; |
Denis V. Lunev | 9b00ea3 | 2015-11-19 09:42:03 +0300 | [diff] [blame] | 603 | } |
Denis V. Lunev | 4c1cdba | 2015-11-19 09:42:04 +0300 | [diff] [blame] | 604 | |
| 605 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 606 | int bdrv_all_goto_snapshot(const char *name, |
| 607 | bool has_devices, strList *devices, |
| 608 | Error **errp) |
Denis V. Lunev | 4c1cdba | 2015-11-19 09:42:04 +0300 | [diff] [blame] | 609 | { |
Zhao Liu | ce33d85 | 2024-03-11 11:38:03 +0800 | [diff] [blame] | 610 | ERRP_GUARD(); |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 611 | g_autoptr(GList) bdrvs = NULL; |
| 612 | GList *iterbdrvs; |
Kevin Wolf | a32e781 | 2023-09-29 16:51:42 +0200 | [diff] [blame] | 613 | int ret; |
Denis V. Lunev | 4c1cdba | 2015-11-19 09:42:04 +0300 | [diff] [blame] | 614 | |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 615 | GLOBAL_STATE_CODE(); |
| 616 | |
Kevin Wolf | a32e781 | 2023-09-29 16:51:42 +0200 | [diff] [blame] | 617 | bdrv_graph_rdlock_main_loop(); |
| 618 | ret = bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp); |
| 619 | bdrv_graph_rdunlock_main_loop(); |
| 620 | |
| 621 | if (ret < 0) { |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 622 | return -1; |
| 623 | } |
| 624 | |
| 625 | iterbdrvs = bdrvs; |
| 626 | while (iterbdrvs) { |
| 627 | BlockDriverState *bs = iterbdrvs->data; |
Kevin Wolf | a32e781 | 2023-09-29 16:51:42 +0200 | [diff] [blame] | 628 | bool all_snapshots_includes_bs; |
Denis V. Lunev | 4c1cdba | 2015-11-19 09:42:04 +0300 | [diff] [blame] | 629 | |
Kevin Wolf | a32e781 | 2023-09-29 16:51:42 +0200 | [diff] [blame] | 630 | bdrv_graph_rdlock_main_loop(); |
| 631 | all_snapshots_includes_bs = bdrv_all_snapshots_includes_bs(bs); |
| 632 | bdrv_graph_rdunlock_main_loop(); |
| 633 | |
Thomas Huth | 6ab4f1c | 2023-10-23 19:50:38 +0200 | [diff] [blame] | 634 | ret = (devices || all_snapshots_includes_bs) ? |
| 635 | bdrv_snapshot_goto(bs, name, errp) : 0; |
Kevin Wolf | 2b624fe | 2017-11-20 15:36:48 +0100 | [diff] [blame] | 636 | if (ret < 0) { |
Kevin Wolf | 4026f1c | 2023-09-29 16:51:47 +0200 | [diff] [blame] | 637 | bdrv_graph_rdlock_main_loop(); |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 638 | error_prepend(errp, "Could not load snapshot '%s' on '%s': ", |
| 639 | name, bdrv_get_device_or_node_name(bs)); |
Kevin Wolf | 4026f1c | 2023-09-29 16:51:47 +0200 | [diff] [blame] | 640 | bdrv_graph_rdunlock_main_loop(); |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 641 | return -1; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 642 | } |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 643 | |
| 644 | iterbdrvs = iterbdrvs->next; |
Denis V. Lunev | 4c1cdba | 2015-11-19 09:42:04 +0300 | [diff] [blame] | 645 | } |
| 646 | |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 647 | return 0; |
Denis V. Lunev | 4c1cdba | 2015-11-19 09:42:04 +0300 | [diff] [blame] | 648 | } |
Denis V. Lunev | 723ccda | 2015-11-19 09:42:06 +0300 | [diff] [blame] | 649 | |
Daniel P. Berrangé | 3d3e9b1 | 2021-02-04 12:48:28 +0000 | [diff] [blame] | 650 | int bdrv_all_has_snapshot(const char *name, |
| 651 | bool has_devices, strList *devices, |
| 652 | Error **errp) |
Denis V. Lunev | 723ccda | 2015-11-19 09:42:06 +0300 | [diff] [blame] | 653 | { |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 654 | g_autoptr(GList) bdrvs = NULL; |
| 655 | GList *iterbdrvs; |
Denis V. Lunev | 723ccda | 2015-11-19 09:42:06 +0300 | [diff] [blame] | 656 | |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 657 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 2b3912f | 2023-09-29 16:51:39 +0200 | [diff] [blame] | 658 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 659 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 660 | if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { |
| 661 | return -1; |
| 662 | } |
| 663 | |
| 664 | iterbdrvs = bdrvs; |
| 665 | while (iterbdrvs) { |
| 666 | BlockDriverState *bs = iterbdrvs->data; |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 667 | QEMUSnapshotInfo sn; |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 668 | int ret = 0; |
Denis V. Lunev | 723ccda | 2015-11-19 09:42:06 +0300 | [diff] [blame] | 669 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 670 | if (devices || bdrv_all_snapshots_includes_bs(bs)) { |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 671 | ret = bdrv_snapshot_find(bs, &sn, name); |
Denis V. Lunev | 723ccda | 2015-11-19 09:42:06 +0300 | [diff] [blame] | 672 | } |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 673 | if (ret < 0) { |
Daniel P. Berrangé | 3d3e9b1 | 2021-02-04 12:48:28 +0000 | [diff] [blame] | 674 | if (ret == -ENOENT) { |
| 675 | return 0; |
| 676 | } else { |
| 677 | error_setg_errno(errp, errno, |
| 678 | "Could not check snapshot '%s' on '%s'", |
| 679 | name, bdrv_get_device_or_node_name(bs)); |
| 680 | return -1; |
| 681 | } |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 682 | } |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 683 | |
| 684 | iterbdrvs = iterbdrvs->next; |
Denis V. Lunev | 723ccda | 2015-11-19 09:42:06 +0300 | [diff] [blame] | 685 | } |
| 686 | |
Daniel P. Berrangé | 3d3e9b1 | 2021-02-04 12:48:28 +0000 | [diff] [blame] | 687 | return 1; |
Denis V. Lunev | 723ccda | 2015-11-19 09:42:06 +0300 | [diff] [blame] | 688 | } |
Denis V. Lunev | a9085f9 | 2015-11-19 09:42:08 +0300 | [diff] [blame] | 689 | |
| 690 | int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, |
| 691 | BlockDriverState *vm_state_bs, |
| 692 | uint64_t vm_state_size, |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 693 | bool has_devices, strList *devices, |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 694 | Error **errp) |
Denis V. Lunev | a9085f9 | 2015-11-19 09:42:08 +0300 | [diff] [blame] | 695 | { |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 696 | g_autoptr(GList) bdrvs = NULL; |
| 697 | GList *iterbdrvs; |
Kevin Wolf | 2b3912f | 2023-09-29 16:51:39 +0200 | [diff] [blame] | 698 | |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 699 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 2b3912f | 2023-09-29 16:51:39 +0200 | [diff] [blame] | 700 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Denis V. Lunev | a9085f9 | 2015-11-19 09:42:08 +0300 | [diff] [blame] | 701 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 702 | if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { |
| 703 | return -1; |
| 704 | } |
| 705 | |
| 706 | iterbdrvs = bdrvs; |
| 707 | while (iterbdrvs) { |
| 708 | BlockDriverState *bs = iterbdrvs->data; |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 709 | int ret = 0; |
Denis V. Lunev | a9085f9 | 2015-11-19 09:42:08 +0300 | [diff] [blame] | 710 | |
Denis V. Lunev | a9085f9 | 2015-11-19 09:42:08 +0300 | [diff] [blame] | 711 | if (bs == vm_state_bs) { |
| 712 | sn->vm_state_size = vm_state_size; |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 713 | ret = bdrv_snapshot_create(bs, sn); |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 714 | } else if (devices || bdrv_all_snapshots_includes_bs(bs)) { |
Denis V. Lunev | a9085f9 | 2015-11-19 09:42:08 +0300 | [diff] [blame] | 715 | sn->vm_state_size = 0; |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 716 | ret = bdrv_snapshot_create(bs, sn); |
Denis V. Lunev | a9085f9 | 2015-11-19 09:42:08 +0300 | [diff] [blame] | 717 | } |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 718 | if (ret < 0) { |
| 719 | error_setg(errp, "Could not create snapshot '%s' on '%s'", |
| 720 | sn->name, bdrv_get_device_or_node_name(bs)); |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 721 | return -1; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 722 | } |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 723 | |
| 724 | iterbdrvs = iterbdrvs->next; |
Denis V. Lunev | a9085f9 | 2015-11-19 09:42:08 +0300 | [diff] [blame] | 725 | } |
| 726 | |
Daniel P. Berrangé | e26f98e | 2021-02-04 12:48:23 +0000 | [diff] [blame] | 727 | return 0; |
Denis V. Lunev | a9085f9 | 2015-11-19 09:42:08 +0300 | [diff] [blame] | 728 | } |
Denis V. Lunev | 7cb1448 | 2015-11-19 09:42:10 +0300 | [diff] [blame] | 729 | |
Daniel P. Berrangé | c22d644 | 2021-02-04 12:48:27 +0000 | [diff] [blame] | 730 | |
| 731 | BlockDriverState *bdrv_all_find_vmstate_bs(const char *vmstate_bs, |
| 732 | bool has_devices, strList *devices, |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 733 | Error **errp) |
Denis V. Lunev | 7cb1448 | 2015-11-19 09:42:10 +0300 | [diff] [blame] | 734 | { |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 735 | g_autoptr(GList) bdrvs = NULL; |
| 736 | GList *iterbdrvs; |
Denis V. Lunev | 7cb1448 | 2015-11-19 09:42:10 +0300 | [diff] [blame] | 737 | |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 738 | GLOBAL_STATE_CODE(); |
Kevin Wolf | 2b3912f | 2023-09-29 16:51:39 +0200 | [diff] [blame] | 739 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
Emanuele Giuseppe Esposito | 6b573ef | 2022-03-03 10:16:07 -0500 | [diff] [blame] | 740 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 741 | if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { |
| 742 | return NULL; |
| 743 | } |
| 744 | |
| 745 | iterbdrvs = bdrvs; |
| 746 | while (iterbdrvs) { |
| 747 | BlockDriverState *bs = iterbdrvs->data; |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 748 | bool found = false; |
Denis V. Lunev | 7cb1448 | 2015-11-19 09:42:10 +0300 | [diff] [blame] | 749 | |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 750 | found = (devices || bdrv_all_snapshots_includes_bs(bs)) && |
| 751 | bdrv_can_snapshot(bs); |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 752 | |
Daniel P. Berrangé | c22d644 | 2021-02-04 12:48:27 +0000 | [diff] [blame] | 753 | if (vmstate_bs) { |
| 754 | if (g_str_equal(vmstate_bs, |
| 755 | bdrv_get_node_name(bs))) { |
| 756 | if (found) { |
| 757 | return bs; |
| 758 | } else { |
| 759 | error_setg(errp, |
| 760 | "vmstate block device '%s' does not support snapshots", |
| 761 | vmstate_bs); |
| 762 | return NULL; |
| 763 | } |
| 764 | } |
| 765 | } else if (found) { |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 766 | return bs; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 767 | } |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 768 | |
| 769 | iterbdrvs = iterbdrvs->next; |
Denis V. Lunev | 7cb1448 | 2015-11-19 09:42:10 +0300 | [diff] [blame] | 770 | } |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 771 | |
Daniel P. Berrangé | c22d644 | 2021-02-04 12:48:27 +0000 | [diff] [blame] | 772 | if (vmstate_bs) { |
| 773 | error_setg(errp, |
| 774 | "vmstate block device '%s' does not exist", vmstate_bs); |
| 775 | } else { |
| 776 | error_setg(errp, |
| 777 | "no block device can store vmstate for snapshot"); |
| 778 | } |
Daniel P. Berrangé | cf3a74c | 2021-02-04 12:48:26 +0000 | [diff] [blame] | 779 | return NULL; |
Denis V. Lunev | 7cb1448 | 2015-11-19 09:42:10 +0300 | [diff] [blame] | 780 | } |