1de08c606SWenchao Xia /* 2de08c606SWenchao Xia * Block layer snapshot related functions 3de08c606SWenchao Xia * 4de08c606SWenchao Xia * Copyright (c) 2003-2008 Fabrice Bellard 5de08c606SWenchao Xia * 6de08c606SWenchao Xia * Permission is hereby granted, free of charge, to any person obtaining a copy 7de08c606SWenchao Xia * of this software and associated documentation files (the "Software"), to deal 8de08c606SWenchao Xia * in the Software without restriction, including without limitation the rights 9de08c606SWenchao Xia * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10de08c606SWenchao Xia * copies of the Software, and to permit persons to whom the Software is 11de08c606SWenchao Xia * furnished to do so, subject to the following conditions: 12de08c606SWenchao Xia * 13de08c606SWenchao Xia * The above copyright notice and this permission notice shall be included in 14de08c606SWenchao Xia * all copies or substantial portions of the Software. 15de08c606SWenchao Xia * 16de08c606SWenchao Xia * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17de08c606SWenchao Xia * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18de08c606SWenchao Xia * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19de08c606SWenchao Xia * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20de08c606SWenchao Xia * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21de08c606SWenchao Xia * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22de08c606SWenchao Xia * THE SOFTWARE. 23de08c606SWenchao Xia */ 24de08c606SWenchao Xia 2580c71a24SPeter Maydell #include "qemu/osdep.h" 26de08c606SWenchao Xia #include "block/snapshot.h" 27de08c606SWenchao Xia #include "block/block_int.h" 28609f45eaSMax Reitz #include "block/qdict.h" 29da34e65cSMarkus Armbruster #include "qapi/error.h" 30452fcdbcSMarkus Armbruster #include "qapi/qmp/qdict.h" 31cc7a8ea7SMarkus Armbruster #include "qapi/qmp/qerror.h" 327a9e5119SDong Jia Shi #include "qapi/qmp/qstring.h" 33922a01a0SMarkus Armbruster #include "qemu/option.h" 3405f4acedSKevin Wolf #include "sysemu/block-backend.h" 35de08c606SWenchao Xia 368c116b0eSWenchao Xia QemuOptsList internal_snapshot_opts = { 378c116b0eSWenchao Xia .name = "snapshot", 388c116b0eSWenchao Xia .head = QTAILQ_HEAD_INITIALIZER(internal_snapshot_opts.head), 398c116b0eSWenchao Xia .desc = { 408c116b0eSWenchao Xia { 418c116b0eSWenchao Xia .name = SNAPSHOT_OPT_ID, 428c116b0eSWenchao Xia .type = QEMU_OPT_STRING, 438c116b0eSWenchao Xia .help = "snapshot id" 448c116b0eSWenchao Xia },{ 458c116b0eSWenchao Xia .name = SNAPSHOT_OPT_NAME, 468c116b0eSWenchao Xia .type = QEMU_OPT_STRING, 478c116b0eSWenchao Xia .help = "snapshot name" 488c116b0eSWenchao Xia },{ 498c116b0eSWenchao Xia /* end of list */ 508c116b0eSWenchao Xia } 518c116b0eSWenchao Xia }, 528c116b0eSWenchao Xia }; 538c116b0eSWenchao Xia 54de08c606SWenchao Xia int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info, 55de08c606SWenchao Xia const char *name) 56de08c606SWenchao Xia { 57de08c606SWenchao Xia QEMUSnapshotInfo *sn_tab, *sn; 58de08c606SWenchao Xia int nb_sns, i, ret; 59de08c606SWenchao Xia 606b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 616b573efeSEmanuele Giuseppe Esposito 62de08c606SWenchao Xia ret = -ENOENT; 63de08c606SWenchao Xia nb_sns = bdrv_snapshot_list(bs, &sn_tab); 64de08c606SWenchao Xia if (nb_sns < 0) { 65de08c606SWenchao Xia return ret; 66de08c606SWenchao Xia } 67de08c606SWenchao Xia for (i = 0; i < nb_sns; i++) { 68de08c606SWenchao Xia sn = &sn_tab[i]; 696ca08045SDaniel Henrique Barboza if (!strcmp(sn->name, name)) { 70de08c606SWenchao Xia *sn_info = *sn; 71de08c606SWenchao Xia ret = 0; 72de08c606SWenchao Xia break; 73de08c606SWenchao Xia } 74de08c606SWenchao Xia } 75de08c606SWenchao Xia g_free(sn_tab); 76de08c606SWenchao Xia return ret; 77de08c606SWenchao Xia } 78de08c606SWenchao Xia 792ea1dd75SWenchao Xia /** 802ea1dd75SWenchao Xia * Look up an internal snapshot by @id and @name. 812ea1dd75SWenchao Xia * @bs: block device to search 822ea1dd75SWenchao Xia * @id: unique snapshot ID, or NULL 832ea1dd75SWenchao Xia * @name: snapshot name, or NULL 842ea1dd75SWenchao Xia * @sn_info: location to store information on the snapshot found 852ea1dd75SWenchao Xia * @errp: location to store error, will be set only for exception 862ea1dd75SWenchao Xia * 872ea1dd75SWenchao Xia * This function will traverse snapshot list in @bs to search the matching 882ea1dd75SWenchao Xia * one, @id and @name are the matching condition: 892ea1dd75SWenchao Xia * If both @id and @name are specified, find the first one with id @id and 902ea1dd75SWenchao Xia * name @name. 912ea1dd75SWenchao Xia * If only @id is specified, find the first one with id @id. 922ea1dd75SWenchao Xia * If only @name is specified, find the first one with name @name. 932ea1dd75SWenchao Xia * if none is specified, abort(). 942ea1dd75SWenchao Xia * 952ea1dd75SWenchao Xia * Returns: true when a snapshot is found and @sn_info will be filled, false 962ea1dd75SWenchao Xia * when error or not found. If all operation succeed but no matching one is 972ea1dd75SWenchao Xia * found, @errp will NOT be set. 982ea1dd75SWenchao Xia */ 992ea1dd75SWenchao Xia bool bdrv_snapshot_find_by_id_and_name(BlockDriverState *bs, 1002ea1dd75SWenchao Xia const char *id, 1012ea1dd75SWenchao Xia const char *name, 1022ea1dd75SWenchao Xia QEMUSnapshotInfo *sn_info, 1032ea1dd75SWenchao Xia Error **errp) 1042ea1dd75SWenchao Xia { 1052ea1dd75SWenchao Xia QEMUSnapshotInfo *sn_tab, *sn; 1062ea1dd75SWenchao Xia int nb_sns, i; 1072ea1dd75SWenchao Xia bool ret = false; 1082ea1dd75SWenchao Xia 1092ea1dd75SWenchao Xia assert(id || name); 1106b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 1112ea1dd75SWenchao Xia 1122ea1dd75SWenchao Xia nb_sns = bdrv_snapshot_list(bs, &sn_tab); 1132ea1dd75SWenchao Xia if (nb_sns < 0) { 1142ea1dd75SWenchao Xia error_setg_errno(errp, -nb_sns, "Failed to get a snapshot list"); 1152ea1dd75SWenchao Xia return false; 1162ea1dd75SWenchao Xia } else if (nb_sns == 0) { 1172ea1dd75SWenchao Xia return false; 1182ea1dd75SWenchao Xia } 1192ea1dd75SWenchao Xia 1202ea1dd75SWenchao Xia if (id && name) { 1212ea1dd75SWenchao Xia for (i = 0; i < nb_sns; i++) { 1222ea1dd75SWenchao Xia sn = &sn_tab[i]; 1232ea1dd75SWenchao Xia if (!strcmp(sn->id_str, id) && !strcmp(sn->name, name)) { 1242ea1dd75SWenchao Xia *sn_info = *sn; 1252ea1dd75SWenchao Xia ret = true; 1262ea1dd75SWenchao Xia break; 1272ea1dd75SWenchao Xia } 1282ea1dd75SWenchao Xia } 1292ea1dd75SWenchao Xia } else if (id) { 1302ea1dd75SWenchao Xia for (i = 0; i < nb_sns; i++) { 1312ea1dd75SWenchao Xia sn = &sn_tab[i]; 1322ea1dd75SWenchao Xia if (!strcmp(sn->id_str, id)) { 1332ea1dd75SWenchao Xia *sn_info = *sn; 1342ea1dd75SWenchao Xia ret = true; 1352ea1dd75SWenchao Xia break; 1362ea1dd75SWenchao Xia } 1372ea1dd75SWenchao Xia } 1382ea1dd75SWenchao Xia } else if (name) { 1392ea1dd75SWenchao Xia for (i = 0; i < nb_sns; i++) { 1402ea1dd75SWenchao Xia sn = &sn_tab[i]; 1412ea1dd75SWenchao Xia if (!strcmp(sn->name, name)) { 1422ea1dd75SWenchao Xia *sn_info = *sn; 1432ea1dd75SWenchao Xia ret = true; 1442ea1dd75SWenchao Xia break; 1452ea1dd75SWenchao Xia } 1462ea1dd75SWenchao Xia } 1472ea1dd75SWenchao Xia } 1482ea1dd75SWenchao Xia 1492ea1dd75SWenchao Xia g_free(sn_tab); 1502ea1dd75SWenchao Xia return ret; 1512ea1dd75SWenchao Xia } 1522ea1dd75SWenchao Xia 153c8af8757SMax Reitz /** 154c8af8757SMax Reitz * Return a pointer to the child BDS pointer to which we can fall 155c8af8757SMax Reitz * back if the given BDS does not support snapshots. 156c8af8757SMax Reitz * Return NULL if there is no BDS to (safely) fall back to. 157c8af8757SMax Reitz * 158c8af8757SMax Reitz * We need to return an indirect pointer because bdrv_snapshot_goto() 159c8af8757SMax Reitz * has to modify the BdrvChild pointer. 160c8af8757SMax Reitz */ 161c8af8757SMax Reitz static BdrvChild **bdrv_snapshot_fallback_ptr(BlockDriverState *bs) 162c8af8757SMax Reitz { 163c8af8757SMax Reitz BdrvChild **fallback; 1640c6100a7SVladimir Sementsov-Ogievskiy BdrvChild *child = bdrv_primary_child(bs); 165c8af8757SMax Reitz 1660c6100a7SVladimir Sementsov-Ogievskiy /* We allow fallback only to primary child */ 1670c6100a7SVladimir Sementsov-Ogievskiy if (!child) { 168c8af8757SMax Reitz return NULL; 169c8af8757SMax Reitz } 1700c6100a7SVladimir Sementsov-Ogievskiy fallback = (child == bs->file ? &bs->file : &bs->backing); 1710c6100a7SVladimir Sementsov-Ogievskiy assert(*fallback == child); 172c8af8757SMax Reitz 173c8af8757SMax Reitz /* 174c8af8757SMax Reitz * Check that there are no other children that would need to be 175c8af8757SMax Reitz * snapshotted. If there are, it is not safe to fall back to 176c8af8757SMax Reitz * *fallback. 177c8af8757SMax Reitz */ 178c8af8757SMax Reitz QLIST_FOREACH(child, &bs->children, next) { 179c8af8757SMax Reitz if (child->role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA | 180c8af8757SMax Reitz BDRV_CHILD_FILTERED) && 181c8af8757SMax Reitz child != *fallback) 182c8af8757SMax Reitz { 183c8af8757SMax Reitz return NULL; 184c8af8757SMax Reitz } 185c8af8757SMax Reitz } 186c8af8757SMax Reitz 187c8af8757SMax Reitz return fallback; 188c8af8757SMax Reitz } 189c8af8757SMax Reitz 190c8af8757SMax Reitz static BlockDriverState *bdrv_snapshot_fallback(BlockDriverState *bs) 191c8af8757SMax Reitz { 192c8af8757SMax Reitz BdrvChild **child_ptr = bdrv_snapshot_fallback_ptr(bs); 193c8af8757SMax Reitz return child_ptr ? (*child_ptr)->bs : NULL; 194c8af8757SMax Reitz } 195c8af8757SMax Reitz 196de08c606SWenchao Xia int bdrv_can_snapshot(BlockDriverState *bs) 197de08c606SWenchao Xia { 198de08c606SWenchao Xia BlockDriver *drv = bs->drv; 1996b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 200de08c606SWenchao Xia if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { 201de08c606SWenchao Xia return 0; 202de08c606SWenchao Xia } 203de08c606SWenchao Xia 204de08c606SWenchao Xia if (!drv->bdrv_snapshot_create) { 205c8af8757SMax Reitz BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs); 206c8af8757SMax Reitz if (fallback_bs) { 207c8af8757SMax Reitz return bdrv_can_snapshot(fallback_bs); 208de08c606SWenchao Xia } 209de08c606SWenchao Xia return 0; 210de08c606SWenchao Xia } 211de08c606SWenchao Xia 212de08c606SWenchao Xia return 1; 213de08c606SWenchao Xia } 214de08c606SWenchao Xia 215de08c606SWenchao Xia int bdrv_snapshot_create(BlockDriverState *bs, 216de08c606SWenchao Xia QEMUSnapshotInfo *sn_info) 217de08c606SWenchao Xia { 218de08c606SWenchao Xia BlockDriver *drv = bs->drv; 219c8af8757SMax Reitz BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs); 2206b573efeSEmanuele Giuseppe Esposito 2216b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 2226b573efeSEmanuele Giuseppe Esposito 223de08c606SWenchao Xia if (!drv) { 224de08c606SWenchao Xia return -ENOMEDIUM; 225de08c606SWenchao Xia } 226de08c606SWenchao Xia if (drv->bdrv_snapshot_create) { 227de08c606SWenchao Xia return drv->bdrv_snapshot_create(bs, sn_info); 228de08c606SWenchao Xia } 229c8af8757SMax Reitz if (fallback_bs) { 230c8af8757SMax Reitz return bdrv_snapshot_create(fallback_bs, sn_info); 231de08c606SWenchao Xia } 232de08c606SWenchao Xia return -ENOTSUP; 233de08c606SWenchao Xia } 234de08c606SWenchao Xia 235de08c606SWenchao Xia int bdrv_snapshot_goto(BlockDriverState *bs, 2360b62bcbcSKevin Wolf const char *snapshot_id, 2370b62bcbcSKevin Wolf Error **errp) 238de08c606SWenchao Xia { 239de08c606SWenchao Xia BlockDriver *drv = bs->drv; 240c8af8757SMax Reitz BdrvChild **fallback_ptr; 241de08c606SWenchao Xia int ret, open_ret; 242de08c606SWenchao Xia 2436b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 2446b573efeSEmanuele Giuseppe Esposito 245de08c606SWenchao Xia if (!drv) { 2460b62bcbcSKevin Wolf error_setg(errp, "Block driver is closed"); 247de08c606SWenchao Xia return -ENOMEDIUM; 248de08c606SWenchao Xia } 24904dec3c3SVladimir Sementsov-Ogievskiy 25070a5afedSKevin Wolf if (!QLIST_EMPTY(&bs->dirty_bitmaps)) { 25170a5afedSKevin Wolf error_setg(errp, "Device has active dirty bitmaps"); 25270a5afedSKevin Wolf return -EBUSY; 25304dec3c3SVladimir Sementsov-Ogievskiy } 25404dec3c3SVladimir Sementsov-Ogievskiy 255de08c606SWenchao Xia if (drv->bdrv_snapshot_goto) { 2560b62bcbcSKevin Wolf ret = drv->bdrv_snapshot_goto(bs, snapshot_id); 2570b62bcbcSKevin Wolf if (ret < 0) { 2580b62bcbcSKevin Wolf error_setg_errno(errp, -ret, "Failed to load snapshot"); 2590b62bcbcSKevin Wolf } 2600b62bcbcSKevin Wolf return ret; 261de08c606SWenchao Xia } 262de08c606SWenchao Xia 263c8af8757SMax Reitz fallback_ptr = bdrv_snapshot_fallback_ptr(bs); 264c8af8757SMax Reitz if (fallback_ptr) { 265c8af8757SMax Reitz QDict *options; 2667a9e5119SDong Jia Shi QDict *file_options; 2670b62bcbcSKevin Wolf Error *local_err = NULL; 268c8af8757SMax Reitz BlockDriverState *fallback_bs = (*fallback_ptr)->bs; 269c8af8757SMax Reitz char *subqdict_prefix = g_strdup_printf("%s.", (*fallback_ptr)->name); 2707a9e5119SDong Jia Shi 271c8af8757SMax Reitz options = qdict_clone_shallow(bs->options); 272c8af8757SMax Reitz 2737a9e5119SDong Jia Shi /* Prevent it from getting deleted when detached from bs */ 274c8af8757SMax Reitz bdrv_ref(fallback_bs); 2757a9e5119SDong Jia Shi 276c8af8757SMax Reitz qdict_extract_subqdict(options, &file_options, subqdict_prefix); 277cb3e7f08SMarc-André Lureau qobject_unref(file_options); 278c8af8757SMax Reitz g_free(subqdict_prefix); 279c8af8757SMax Reitz 28032a9a245SMax Reitz /* Force .bdrv_open() below to re-attach fallback_bs on *fallback_ptr */ 281c8af8757SMax Reitz qdict_put_str(options, (*fallback_ptr)->name, 282c8af8757SMax Reitz bdrv_get_node_name(fallback_bs)); 2837a9e5119SDong Jia Shi 28432a9a245SMax Reitz /* Now close bs, apply the snapshot on fallback_bs, and re-open bs */ 2853c005293SVladimir Sementsov-Ogievskiy if (drv->bdrv_close) { 286de08c606SWenchao Xia drv->bdrv_close(bs); 2873c005293SVladimir Sementsov-Ogievskiy } 2887a9e5119SDong Jia Shi 28932a9a245SMax Reitz /* .bdrv_open() will re-attach it */ 290c8af8757SMax Reitz bdrv_unref_child(bs, *fallback_ptr); 291c8af8757SMax Reitz *fallback_ptr = NULL; 292c8af8757SMax Reitz 293c8af8757SMax Reitz ret = bdrv_snapshot_goto(fallback_bs, snapshot_id, errp); 2940b62bcbcSKevin Wolf open_ret = drv->bdrv_open(bs, options, bs->open_flags, &local_err); 295cb3e7f08SMarc-André Lureau qobject_unref(options); 296de08c606SWenchao Xia if (open_ret < 0) { 297c8af8757SMax Reitz bdrv_unref(fallback_bs); 298de08c606SWenchao Xia bs->drv = NULL; 2990b62bcbcSKevin Wolf /* A bdrv_snapshot_goto() error takes precedence */ 3000b62bcbcSKevin Wolf error_propagate(errp, local_err); 3010b62bcbcSKevin Wolf return ret < 0 ? ret : open_ret; 302de08c606SWenchao Xia } 3037a9e5119SDong Jia Shi 30432a9a245SMax Reitz /* 3050c6100a7SVladimir Sementsov-Ogievskiy * fallback was a primary child. It was closed above and set to NULL, 3060c6100a7SVladimir Sementsov-Ogievskiy * but the .bdrv_open() call has opened it again, because we set the 3070c6100a7SVladimir Sementsov-Ogievskiy * respective option (with the qdict_put_str() call above). 3080c6100a7SVladimir Sementsov-Ogievskiy * Assert that .bdrv_open() has attached the right BDS as primary child. 30932a9a245SMax Reitz */ 3100c6100a7SVladimir Sementsov-Ogievskiy assert(bdrv_primary_bs(bs) == fallback_bs); 311c8af8757SMax Reitz bdrv_unref(fallback_bs); 312de08c606SWenchao Xia return ret; 313de08c606SWenchao Xia } 314de08c606SWenchao Xia 3150b62bcbcSKevin Wolf error_setg(errp, "Block driver does not support snapshots"); 316de08c606SWenchao Xia return -ENOTSUP; 317de08c606SWenchao Xia } 318de08c606SWenchao Xia 319a89d89d3SWenchao Xia /** 320a89d89d3SWenchao Xia * Delete an internal snapshot by @snapshot_id and @name. 321a89d89d3SWenchao Xia * @bs: block device used in the operation 322a89d89d3SWenchao Xia * @snapshot_id: unique snapshot ID, or NULL 323a89d89d3SWenchao Xia * @name: snapshot name, or NULL 324a89d89d3SWenchao Xia * @errp: location to store error 325a89d89d3SWenchao Xia * 326a89d89d3SWenchao Xia * If both @snapshot_id and @name are specified, delete the first one with 327a89d89d3SWenchao Xia * id @snapshot_id and name @name. 328a89d89d3SWenchao Xia * If only @snapshot_id is specified, delete the first one with id 329a89d89d3SWenchao Xia * @snapshot_id. 330a89d89d3SWenchao Xia * If only @name is specified, delete the first one with name @name. 3317b4c4781SWenchao Xia * if none is specified, return -EINVAL. 332a89d89d3SWenchao Xia * 333a89d89d3SWenchao Xia * Returns: 0 on success, -errno on failure. If @bs is not inserted, return 334a89d89d3SWenchao Xia * -ENOMEDIUM. If @snapshot_id and @name are both NULL, return -EINVAL. If @bs 335a89d89d3SWenchao Xia * does not support internal snapshot deletion, return -ENOTSUP. If @bs does 336a89d89d3SWenchao Xia * not support parameter @snapshot_id or @name, or one of them is not correctly 337a89d89d3SWenchao Xia * specified, return -EINVAL. If @bs can't find one matching @id and @name, 338a89d89d3SWenchao Xia * return -ENOENT. If @errp != NULL, it will always be filled with error 339a89d89d3SWenchao Xia * message on failure. 340a89d89d3SWenchao Xia */ 341a89d89d3SWenchao Xia int bdrv_snapshot_delete(BlockDriverState *bs, 342a89d89d3SWenchao Xia const char *snapshot_id, 343a89d89d3SWenchao Xia const char *name, 344a89d89d3SWenchao Xia Error **errp) 345de08c606SWenchao Xia { 346de08c606SWenchao Xia BlockDriver *drv = bs->drv; 347c8af8757SMax Reitz BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs); 34827a7649aSPaolo Bonzini int ret; 34927a7649aSPaolo Bonzini 3506b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 3516b573efeSEmanuele Giuseppe Esposito 352de08c606SWenchao Xia if (!drv) { 353c6bd8c70SMarkus Armbruster error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs)); 354de08c606SWenchao Xia return -ENOMEDIUM; 355de08c606SWenchao Xia } 356a89d89d3SWenchao Xia if (!snapshot_id && !name) { 357a89d89d3SWenchao Xia error_setg(errp, "snapshot_id and name are both NULL"); 358a89d89d3SWenchao Xia return -EINVAL; 359a89d89d3SWenchao Xia } 3603432a192SZhang Haoyu 3613432a192SZhang Haoyu /* drain all pending i/o before deleting snapshot */ 36227a7649aSPaolo Bonzini bdrv_drained_begin(bs); 3633432a192SZhang Haoyu 364de08c606SWenchao Xia if (drv->bdrv_snapshot_delete) { 36527a7649aSPaolo Bonzini ret = drv->bdrv_snapshot_delete(bs, snapshot_id, name, errp); 366c8af8757SMax Reitz } else if (fallback_bs) { 367c8af8757SMax Reitz ret = bdrv_snapshot_delete(fallback_bs, snapshot_id, name, errp); 36827a7649aSPaolo Bonzini } else { 36981e5f78aSAlberto Garcia error_setg(errp, "Block format '%s' used by device '%s' " 37081e5f78aSAlberto Garcia "does not support internal snapshot deletion", 37181e5f78aSAlberto Garcia drv->format_name, bdrv_get_device_name(bs)); 37227a7649aSPaolo Bonzini ret = -ENOTSUP; 37327a7649aSPaolo Bonzini } 37427a7649aSPaolo Bonzini 37527a7649aSPaolo Bonzini bdrv_drained_end(bs); 37627a7649aSPaolo Bonzini return ret; 377de08c606SWenchao Xia } 378de08c606SWenchao Xia 379de08c606SWenchao Xia int bdrv_snapshot_list(BlockDriverState *bs, 380de08c606SWenchao Xia QEMUSnapshotInfo **psn_info) 381de08c606SWenchao Xia { 382de08c606SWenchao Xia BlockDriver *drv = bs->drv; 383c8af8757SMax Reitz BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs); 3846b573efeSEmanuele Giuseppe Esposito 3856b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 386de08c606SWenchao Xia if (!drv) { 387de08c606SWenchao Xia return -ENOMEDIUM; 388de08c606SWenchao Xia } 389de08c606SWenchao Xia if (drv->bdrv_snapshot_list) { 390de08c606SWenchao Xia return drv->bdrv_snapshot_list(bs, psn_info); 391de08c606SWenchao Xia } 392c8af8757SMax Reitz if (fallback_bs) { 393c8af8757SMax Reitz return bdrv_snapshot_list(fallback_bs, psn_info); 394de08c606SWenchao Xia } 395de08c606SWenchao Xia return -ENOTSUP; 396de08c606SWenchao Xia } 397de08c606SWenchao Xia 3987b4c4781SWenchao Xia /** 3997b4c4781SWenchao Xia * Temporarily load an internal snapshot by @snapshot_id and @name. 4007b4c4781SWenchao Xia * @bs: block device used in the operation 4017b4c4781SWenchao Xia * @snapshot_id: unique snapshot ID, or NULL 4027b4c4781SWenchao Xia * @name: snapshot name, or NULL 4037b4c4781SWenchao Xia * @errp: location to store error 4047b4c4781SWenchao Xia * 4057b4c4781SWenchao Xia * If both @snapshot_id and @name are specified, load the first one with 4067b4c4781SWenchao Xia * id @snapshot_id and name @name. 4077b4c4781SWenchao Xia * If only @snapshot_id is specified, load the first one with id 4087b4c4781SWenchao Xia * @snapshot_id. 4097b4c4781SWenchao Xia * If only @name is specified, load the first one with name @name. 4107b4c4781SWenchao Xia * if none is specified, return -EINVAL. 4117b4c4781SWenchao Xia * 4127b4c4781SWenchao Xia * Returns: 0 on success, -errno on fail. If @bs is not inserted, return 4137b4c4781SWenchao Xia * -ENOMEDIUM. If @bs is not readonly, return -EINVAL. If @bs did not support 4147b4c4781SWenchao Xia * internal snapshot, return -ENOTSUP. If qemu can't find a matching @id and 4157b4c4781SWenchao Xia * @name, return -ENOENT. If @errp != NULL, it will always be filled on 4167b4c4781SWenchao Xia * failure. 4177b4c4781SWenchao Xia */ 418de08c606SWenchao Xia int bdrv_snapshot_load_tmp(BlockDriverState *bs, 4197b4c4781SWenchao Xia const char *snapshot_id, 4207b4c4781SWenchao Xia const char *name, 4217b4c4781SWenchao Xia Error **errp) 422de08c606SWenchao Xia { 423de08c606SWenchao Xia BlockDriver *drv = bs->drv; 4247b4c4781SWenchao Xia 4256b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 4266b573efeSEmanuele Giuseppe Esposito 427de08c606SWenchao Xia if (!drv) { 428c6bd8c70SMarkus Armbruster error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs)); 429de08c606SWenchao Xia return -ENOMEDIUM; 430de08c606SWenchao Xia } 4317b4c4781SWenchao Xia if (!snapshot_id && !name) { 4327b4c4781SWenchao Xia error_setg(errp, "snapshot_id and name are both NULL"); 4337b4c4781SWenchao Xia return -EINVAL; 4347b4c4781SWenchao Xia } 435307261b2SVladimir Sementsov-Ogievskiy if (!bdrv_is_read_only(bs)) { 4367b4c4781SWenchao Xia error_setg(errp, "Device is not readonly"); 437de08c606SWenchao Xia return -EINVAL; 438de08c606SWenchao Xia } 439de08c606SWenchao Xia if (drv->bdrv_snapshot_load_tmp) { 4407b4c4781SWenchao Xia return drv->bdrv_snapshot_load_tmp(bs, snapshot_id, name, errp); 441de08c606SWenchao Xia } 44281e5f78aSAlberto Garcia error_setg(errp, "Block format '%s' used by device '%s' " 44381e5f78aSAlberto Garcia "does not support temporarily loading internal snapshots", 44481e5f78aSAlberto Garcia drv->format_name, bdrv_get_device_name(bs)); 445de08c606SWenchao Xia return -ENOTSUP; 446de08c606SWenchao Xia } 4477b4c4781SWenchao Xia 4487b4c4781SWenchao Xia int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs, 4497b4c4781SWenchao Xia const char *id_or_name, 4507b4c4781SWenchao Xia Error **errp) 4517b4c4781SWenchao Xia { 4527b4c4781SWenchao Xia int ret; 4537b4c4781SWenchao Xia Error *local_err = NULL; 4547b4c4781SWenchao Xia 4556b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 4566b573efeSEmanuele Giuseppe Esposito 4577b4c4781SWenchao Xia ret = bdrv_snapshot_load_tmp(bs, id_or_name, NULL, &local_err); 4587b4c4781SWenchao Xia if (ret == -ENOENT || ret == -EINVAL) { 4597b4c4781SWenchao Xia error_free(local_err); 4607b4c4781SWenchao Xia local_err = NULL; 4617b4c4781SWenchao Xia ret = bdrv_snapshot_load_tmp(bs, NULL, id_or_name, &local_err); 4627b4c4781SWenchao Xia } 4637b4c4781SWenchao Xia 4647b4c4781SWenchao Xia error_propagate(errp, local_err); 4657b4c4781SWenchao Xia 4667b4c4781SWenchao Xia return ret; 4677b4c4781SWenchao Xia } 468e9ff957aSDenis V. Lunev 469cf3a74c9SDaniel P. Berrangé 470cf3a74c9SDaniel P. Berrangé static int bdrv_all_get_snapshot_devices(bool has_devices, strList *devices, 471cf3a74c9SDaniel P. Berrangé GList **all_bdrvs, 472cf3a74c9SDaniel P. Berrangé Error **errp) 473cf3a74c9SDaniel P. Berrangé { 474cf3a74c9SDaniel P. Berrangé g_autoptr(GList) bdrvs = NULL; 475cf3a74c9SDaniel P. Berrangé 476cf3a74c9SDaniel P. Berrangé if (has_devices) { 477cf3a74c9SDaniel P. Berrangé if (!devices) { 478cf3a74c9SDaniel P. Berrangé error_setg(errp, "At least one device is required for snapshot"); 479cf3a74c9SDaniel P. Berrangé return -1; 480cf3a74c9SDaniel P. Berrangé } 481cf3a74c9SDaniel P. Berrangé 482cf3a74c9SDaniel P. Berrangé while (devices) { 483cf3a74c9SDaniel P. Berrangé BlockDriverState *bs = bdrv_find_node(devices->value); 484cf3a74c9SDaniel P. Berrangé if (!bs) { 485cf3a74c9SDaniel P. Berrangé error_setg(errp, "No block device node '%s'", devices->value); 486cf3a74c9SDaniel P. Berrangé return -1; 487cf3a74c9SDaniel P. Berrangé } 488cf3a74c9SDaniel P. Berrangé bdrvs = g_list_append(bdrvs, bs); 489cf3a74c9SDaniel P. Berrangé devices = devices->next; 490cf3a74c9SDaniel P. Berrangé } 491cf3a74c9SDaniel P. Berrangé } else { 492cf3a74c9SDaniel P. Berrangé BlockDriverState *bs; 493cf3a74c9SDaniel P. Berrangé BdrvNextIterator it; 494cf3a74c9SDaniel P. Berrangé for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { 495cf3a74c9SDaniel P. Berrangé bdrvs = g_list_append(bdrvs, bs); 496cf3a74c9SDaniel P. Berrangé } 497cf3a74c9SDaniel P. Berrangé } 498cf3a74c9SDaniel P. Berrangé 499cf3a74c9SDaniel P. Berrangé *all_bdrvs = g_steal_pointer(&bdrvs); 500cf3a74c9SDaniel P. Berrangé return 0; 501cf3a74c9SDaniel P. Berrangé } 502cf3a74c9SDaniel P. Berrangé 503cf3a74c9SDaniel P. Berrangé 50405f4acedSKevin Wolf static bool bdrv_all_snapshots_includes_bs(BlockDriverState *bs) 50505f4acedSKevin Wolf { 50605f4acedSKevin Wolf if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { 50705f4acedSKevin Wolf return false; 50805f4acedSKevin Wolf } 50905f4acedSKevin Wolf 51005f4acedSKevin Wolf /* Include all nodes that are either in use by a BlockBackend, or that 51105f4acedSKevin Wolf * aren't attached to any node, but owned by the monitor. */ 51205f4acedSKevin Wolf return bdrv_has_blk(bs) || QLIST_EMPTY(&bs->parents); 51305f4acedSKevin Wolf } 514e9ff957aSDenis V. Lunev 515e9ff957aSDenis V. Lunev /* Group operations. All block drivers are involved. 516e9ff957aSDenis V. Lunev * These functions will properly handle dataplane (take aio_context_acquire 517e9ff957aSDenis V. Lunev * when appropriate for appropriate block drivers) */ 518e9ff957aSDenis V. Lunev 519cf3a74c9SDaniel P. Berrangé bool bdrv_all_can_snapshot(bool has_devices, strList *devices, 520cf3a74c9SDaniel P. Berrangé Error **errp) 521e9ff957aSDenis V. Lunev { 522cf3a74c9SDaniel P. Berrangé g_autoptr(GList) bdrvs = NULL; 523cf3a74c9SDaniel P. Berrangé GList *iterbdrvs; 524e9ff957aSDenis V. Lunev 5256b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 5266b573efeSEmanuele Giuseppe Esposito 527cf3a74c9SDaniel P. Berrangé if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { 528cf3a74c9SDaniel P. Berrangé return false; 529cf3a74c9SDaniel P. Berrangé } 530cf3a74c9SDaniel P. Berrangé 531cf3a74c9SDaniel P. Berrangé iterbdrvs = bdrvs; 532cf3a74c9SDaniel P. Berrangé while (iterbdrvs) { 533cf3a74c9SDaniel P. Berrangé BlockDriverState *bs = iterbdrvs->data; 534e9ff957aSDenis V. Lunev AioContext *ctx = bdrv_get_aio_context(bs); 535e26f98e2SDaniel P. Berrangé bool ok = true; 536e9ff957aSDenis V. Lunev 537e9ff957aSDenis V. Lunev aio_context_acquire(ctx); 538cf3a74c9SDaniel P. Berrangé if (devices || bdrv_all_snapshots_includes_bs(bs)) { 539e9ff957aSDenis V. Lunev ok = bdrv_can_snapshot(bs); 540e9ff957aSDenis V. Lunev } 541e9ff957aSDenis V. Lunev aio_context_release(ctx); 54288be7b4bSKevin Wolf if (!ok) { 543e26f98e2SDaniel P. Berrangé error_setg(errp, "Device '%s' is writable but does not support " 544e26f98e2SDaniel P. Berrangé "snapshots", bdrv_get_device_or_node_name(bs)); 545e26f98e2SDaniel P. Berrangé return false; 54688be7b4bSKevin Wolf } 547cf3a74c9SDaniel P. Berrangé 548cf3a74c9SDaniel P. Berrangé iterbdrvs = iterbdrvs->next; 549e9ff957aSDenis V. Lunev } 550e9ff957aSDenis V. Lunev 551e26f98e2SDaniel P. Berrangé return true; 552e9ff957aSDenis V. Lunev } 5539b00ea37SDenis V. Lunev 554cf3a74c9SDaniel P. Berrangé int bdrv_all_delete_snapshot(const char *name, 555cf3a74c9SDaniel P. Berrangé bool has_devices, strList *devices, 556cf3a74c9SDaniel P. Berrangé Error **errp) 5579b00ea37SDenis V. Lunev { 558cf3a74c9SDaniel P. Berrangé g_autoptr(GList) bdrvs = NULL; 559cf3a74c9SDaniel P. Berrangé GList *iterbdrvs; 5609b00ea37SDenis V. Lunev 5616b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 5626b573efeSEmanuele Giuseppe Esposito 563cf3a74c9SDaniel P. Berrangé if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { 564cf3a74c9SDaniel P. Berrangé return -1; 565cf3a74c9SDaniel P. Berrangé } 566cf3a74c9SDaniel P. Berrangé 567cf3a74c9SDaniel P. Berrangé iterbdrvs = bdrvs; 568cf3a74c9SDaniel P. Berrangé while (iterbdrvs) { 569cf3a74c9SDaniel P. Berrangé BlockDriverState *bs = iterbdrvs->data; 5709b00ea37SDenis V. Lunev AioContext *ctx = bdrv_get_aio_context(bs); 571cf3a74c9SDaniel P. Berrangé QEMUSnapshotInfo sn1, *snapshot = &sn1; 572e26f98e2SDaniel P. Berrangé int ret = 0; 5739b00ea37SDenis V. Lunev 5749b00ea37SDenis V. Lunev aio_context_acquire(ctx); 575cf3a74c9SDaniel P. Berrangé if ((devices || bdrv_all_snapshots_includes_bs(bs)) && 57605f4acedSKevin Wolf bdrv_snapshot_find(bs, snapshot, name) >= 0) 57705f4acedSKevin Wolf { 5786ca08045SDaniel Henrique Barboza ret = bdrv_snapshot_delete(bs, snapshot->id_str, 579e53a578aSVladimir Sementsov-Ogievskiy snapshot->name, errp); 5809b00ea37SDenis V. Lunev } 5819b00ea37SDenis V. Lunev aio_context_release(ctx); 58288be7b4bSKevin Wolf if (ret < 0) { 583e26f98e2SDaniel P. Berrangé error_prepend(errp, "Could not delete snapshot '%s' on '%s': ", 584e26f98e2SDaniel P. Berrangé name, bdrv_get_device_or_node_name(bs)); 585e26f98e2SDaniel P. Berrangé return -1; 58688be7b4bSKevin Wolf } 587cf3a74c9SDaniel P. Berrangé 588cf3a74c9SDaniel P. Berrangé iterbdrvs = iterbdrvs->next; 5899b00ea37SDenis V. Lunev } 5909b00ea37SDenis V. Lunev 591e26f98e2SDaniel P. Berrangé return 0; 5929b00ea37SDenis V. Lunev } 5934c1cdbaaSDenis V. Lunev 5944c1cdbaaSDenis V. Lunev 595cf3a74c9SDaniel P. Berrangé int bdrv_all_goto_snapshot(const char *name, 596cf3a74c9SDaniel P. Berrangé bool has_devices, strList *devices, 597cf3a74c9SDaniel P. Berrangé Error **errp) 5984c1cdbaaSDenis V. Lunev { 599cf3a74c9SDaniel P. Berrangé g_autoptr(GList) bdrvs = NULL; 600cf3a74c9SDaniel P. Berrangé GList *iterbdrvs; 6014c1cdbaaSDenis V. Lunev 6026b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 6036b573efeSEmanuele Giuseppe Esposito 604cf3a74c9SDaniel P. Berrangé if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { 605cf3a74c9SDaniel P. Berrangé return -1; 606cf3a74c9SDaniel P. Berrangé } 607cf3a74c9SDaniel P. Berrangé 608cf3a74c9SDaniel P. Berrangé iterbdrvs = bdrvs; 609cf3a74c9SDaniel P. Berrangé while (iterbdrvs) { 610cf3a74c9SDaniel P. Berrangé BlockDriverState *bs = iterbdrvs->data; 6114c1cdbaaSDenis V. Lunev AioContext *ctx = bdrv_get_aio_context(bs); 612e26f98e2SDaniel P. Berrangé int ret = 0; 6134c1cdbaaSDenis V. Lunev 6144c1cdbaaSDenis V. Lunev aio_context_acquire(ctx); 615cf3a74c9SDaniel P. Berrangé if (devices || bdrv_all_snapshots_includes_bs(bs)) { 6162b624fe0SKevin Wolf ret = bdrv_snapshot_goto(bs, name, errp); 6174c1cdbaaSDenis V. Lunev } 6184c1cdbaaSDenis V. Lunev aio_context_release(ctx); 6192b624fe0SKevin Wolf if (ret < 0) { 620e26f98e2SDaniel P. Berrangé error_prepend(errp, "Could not load snapshot '%s' on '%s': ", 621e26f98e2SDaniel P. Berrangé name, bdrv_get_device_or_node_name(bs)); 622e26f98e2SDaniel P. Berrangé return -1; 62388be7b4bSKevin Wolf } 624cf3a74c9SDaniel P. Berrangé 625cf3a74c9SDaniel P. Berrangé iterbdrvs = iterbdrvs->next; 6264c1cdbaaSDenis V. Lunev } 6274c1cdbaaSDenis V. Lunev 628e26f98e2SDaniel P. Berrangé return 0; 6294c1cdbaaSDenis V. Lunev } 630723ccda1SDenis V. Lunev 6313d3e9b1fSDaniel P. Berrangé int bdrv_all_has_snapshot(const char *name, 632cf3a74c9SDaniel P. Berrangé bool has_devices, strList *devices, 633cf3a74c9SDaniel P. Berrangé Error **errp) 634723ccda1SDenis V. Lunev { 635cf3a74c9SDaniel P. Berrangé g_autoptr(GList) bdrvs = NULL; 636cf3a74c9SDaniel P. Berrangé GList *iterbdrvs; 637723ccda1SDenis V. Lunev 6386b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 6396b573efeSEmanuele Giuseppe Esposito 640cf3a74c9SDaniel P. Berrangé if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { 641cf3a74c9SDaniel P. Berrangé return -1; 642cf3a74c9SDaniel P. Berrangé } 643cf3a74c9SDaniel P. Berrangé 644cf3a74c9SDaniel P. Berrangé iterbdrvs = bdrvs; 645cf3a74c9SDaniel P. Berrangé while (iterbdrvs) { 646cf3a74c9SDaniel P. Berrangé BlockDriverState *bs = iterbdrvs->data; 647723ccda1SDenis V. Lunev AioContext *ctx = bdrv_get_aio_context(bs); 648cf3a74c9SDaniel P. Berrangé QEMUSnapshotInfo sn; 649e26f98e2SDaniel P. Berrangé int ret = 0; 650723ccda1SDenis V. Lunev 651723ccda1SDenis V. Lunev aio_context_acquire(ctx); 652cf3a74c9SDaniel P. Berrangé if (devices || bdrv_all_snapshots_includes_bs(bs)) { 653e26f98e2SDaniel P. Berrangé ret = bdrv_snapshot_find(bs, &sn, name); 654723ccda1SDenis V. Lunev } 655723ccda1SDenis V. Lunev aio_context_release(ctx); 656e26f98e2SDaniel P. Berrangé if (ret < 0) { 6573d3e9b1fSDaniel P. Berrangé if (ret == -ENOENT) { 6583d3e9b1fSDaniel P. Berrangé return 0; 6593d3e9b1fSDaniel P. Berrangé } else { 6603d3e9b1fSDaniel P. Berrangé error_setg_errno(errp, errno, 6613d3e9b1fSDaniel P. Berrangé "Could not check snapshot '%s' on '%s'", 662e26f98e2SDaniel P. Berrangé name, bdrv_get_device_or_node_name(bs)); 663e26f98e2SDaniel P. Berrangé return -1; 66488be7b4bSKevin Wolf } 6653d3e9b1fSDaniel P. Berrangé } 666cf3a74c9SDaniel P. Berrangé 667cf3a74c9SDaniel P. Berrangé iterbdrvs = iterbdrvs->next; 668723ccda1SDenis V. Lunev } 669723ccda1SDenis V. Lunev 6703d3e9b1fSDaniel P. Berrangé return 1; 671723ccda1SDenis V. Lunev } 672a9085f9bSDenis V. Lunev 673a9085f9bSDenis V. Lunev int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, 674a9085f9bSDenis V. Lunev BlockDriverState *vm_state_bs, 675a9085f9bSDenis V. Lunev uint64_t vm_state_size, 676cf3a74c9SDaniel P. Berrangé bool has_devices, strList *devices, 677e26f98e2SDaniel P. Berrangé Error **errp) 678a9085f9bSDenis V. Lunev { 679cf3a74c9SDaniel P. Berrangé g_autoptr(GList) bdrvs = NULL; 680cf3a74c9SDaniel P. Berrangé GList *iterbdrvs; 6816b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 682a9085f9bSDenis V. Lunev 683cf3a74c9SDaniel P. Berrangé if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { 684cf3a74c9SDaniel P. Berrangé return -1; 685cf3a74c9SDaniel P. Berrangé } 686cf3a74c9SDaniel P. Berrangé 687cf3a74c9SDaniel P. Berrangé iterbdrvs = bdrvs; 688cf3a74c9SDaniel P. Berrangé while (iterbdrvs) { 689cf3a74c9SDaniel P. Berrangé BlockDriverState *bs = iterbdrvs->data; 690a9085f9bSDenis V. Lunev AioContext *ctx = bdrv_get_aio_context(bs); 691e26f98e2SDaniel P. Berrangé int ret = 0; 692a9085f9bSDenis V. Lunev 693a9085f9bSDenis V. Lunev aio_context_acquire(ctx); 694a9085f9bSDenis V. Lunev if (bs == vm_state_bs) { 695a9085f9bSDenis V. Lunev sn->vm_state_size = vm_state_size; 696e26f98e2SDaniel P. Berrangé ret = bdrv_snapshot_create(bs, sn); 697cf3a74c9SDaniel P. Berrangé } else if (devices || bdrv_all_snapshots_includes_bs(bs)) { 698a9085f9bSDenis V. Lunev sn->vm_state_size = 0; 699e26f98e2SDaniel P. Berrangé ret = bdrv_snapshot_create(bs, sn); 700a9085f9bSDenis V. Lunev } 701a9085f9bSDenis V. Lunev aio_context_release(ctx); 702e26f98e2SDaniel P. Berrangé if (ret < 0) { 703e26f98e2SDaniel P. Berrangé error_setg(errp, "Could not create snapshot '%s' on '%s'", 704e26f98e2SDaniel P. Berrangé sn->name, bdrv_get_device_or_node_name(bs)); 705e26f98e2SDaniel P. Berrangé return -1; 70688be7b4bSKevin Wolf } 707cf3a74c9SDaniel P. Berrangé 708cf3a74c9SDaniel P. Berrangé iterbdrvs = iterbdrvs->next; 709a9085f9bSDenis V. Lunev } 710a9085f9bSDenis V. Lunev 711e26f98e2SDaniel P. Berrangé return 0; 712a9085f9bSDenis V. Lunev } 7137cb14481SDenis V. Lunev 714c22d644cSDaniel P. Berrangé 715c22d644cSDaniel P. Berrangé BlockDriverState *bdrv_all_find_vmstate_bs(const char *vmstate_bs, 716c22d644cSDaniel P. Berrangé bool has_devices, strList *devices, 717cf3a74c9SDaniel P. Berrangé Error **errp) 7187cb14481SDenis V. Lunev { 719cf3a74c9SDaniel P. Berrangé g_autoptr(GList) bdrvs = NULL; 720cf3a74c9SDaniel P. Berrangé GList *iterbdrvs; 7217cb14481SDenis V. Lunev 7226b573efeSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 7236b573efeSEmanuele Giuseppe Esposito 724cf3a74c9SDaniel P. Berrangé if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { 725cf3a74c9SDaniel P. Berrangé return NULL; 726cf3a74c9SDaniel P. Berrangé } 727cf3a74c9SDaniel P. Berrangé 728cf3a74c9SDaniel P. Berrangé iterbdrvs = bdrvs; 729cf3a74c9SDaniel P. Berrangé while (iterbdrvs) { 730cf3a74c9SDaniel P. Berrangé BlockDriverState *bs = iterbdrvs->data; 7317cb14481SDenis V. Lunev AioContext *ctx = bdrv_get_aio_context(bs); 732cf3a74c9SDaniel P. Berrangé bool found = false; 7337cb14481SDenis V. Lunev 7347cb14481SDenis V. Lunev aio_context_acquire(ctx); 735cf3a74c9SDaniel P. Berrangé found = (devices || bdrv_all_snapshots_includes_bs(bs)) && 736cf3a74c9SDaniel P. Berrangé bdrv_can_snapshot(bs); 7377cb14481SDenis V. Lunev aio_context_release(ctx); 73888be7b4bSKevin Wolf 739c22d644cSDaniel P. Berrangé if (vmstate_bs) { 740c22d644cSDaniel P. Berrangé if (g_str_equal(vmstate_bs, 741c22d644cSDaniel P. Berrangé bdrv_get_node_name(bs))) { 74288be7b4bSKevin Wolf if (found) { 7437cb14481SDenis V. Lunev return bs; 744c22d644cSDaniel P. Berrangé } else { 745c22d644cSDaniel P. Berrangé error_setg(errp, 746c22d644cSDaniel P. Berrangé "vmstate block device '%s' does not support snapshots", 747c22d644cSDaniel P. Berrangé vmstate_bs); 748c22d644cSDaniel P. Berrangé return NULL; 749c22d644cSDaniel P. Berrangé } 750c22d644cSDaniel P. Berrangé } 751c22d644cSDaniel P. Berrangé } else if (found) { 752c22d644cSDaniel P. Berrangé return bs; 7537cb14481SDenis V. Lunev } 754cf3a74c9SDaniel P. Berrangé 755cf3a74c9SDaniel P. Berrangé iterbdrvs = iterbdrvs->next; 756cf3a74c9SDaniel P. Berrangé } 757cf3a74c9SDaniel P. Berrangé 758c22d644cSDaniel P. Berrangé if (vmstate_bs) { 759c22d644cSDaniel P. Berrangé error_setg(errp, 760c22d644cSDaniel P. Berrangé "vmstate block device '%s' does not exist", vmstate_bs); 761c22d644cSDaniel P. Berrangé } else { 762c22d644cSDaniel P. Berrangé error_setg(errp, 763c22d644cSDaniel P. Berrangé "no block device can store vmstate for snapshot"); 764c22d644cSDaniel P. Berrangé } 765cf3a74c9SDaniel P. Berrangé return NULL; 766cf3a74c9SDaniel P. Berrangé } 767