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Commit | Line | Data |
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de08c606 WX |
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 | ||
80c71a24 | 25 | #include "qemu/osdep.h" |
de08c606 WX |
26 | #include "block/snapshot.h" |
27 | #include "block/block_int.h" | |
da34e65c | 28 | #include "qapi/error.h" |
452fcdbc | 29 | #include "qapi/qmp/qdict.h" |
cc7a8ea7 | 30 | #include "qapi/qmp/qerror.h" |
7a9e5119 | 31 | #include "qapi/qmp/qstring.h" |
de08c606 | 32 | |
8c116b0e WX |
33 | QemuOptsList internal_snapshot_opts = { |
34 | .name = "snapshot", | |
35 | .head = QTAILQ_HEAD_INITIALIZER(internal_snapshot_opts.head), | |
36 | .desc = { | |
37 | { | |
38 | .name = SNAPSHOT_OPT_ID, | |
39 | .type = QEMU_OPT_STRING, | |
40 | .help = "snapshot id" | |
41 | },{ | |
42 | .name = SNAPSHOT_OPT_NAME, | |
43 | .type = QEMU_OPT_STRING, | |
44 | .help = "snapshot name" | |
45 | },{ | |
46 | /* end of list */ | |
47 | } | |
48 | }, | |
49 | }; | |
50 | ||
de08c606 WX |
51 | int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info, |
52 | const char *name) | |
53 | { | |
54 | QEMUSnapshotInfo *sn_tab, *sn; | |
55 | int nb_sns, i, ret; | |
56 | ||
57 | ret = -ENOENT; | |
58 | nb_sns = bdrv_snapshot_list(bs, &sn_tab); | |
59 | if (nb_sns < 0) { | |
60 | return ret; | |
61 | } | |
62 | for (i = 0; i < nb_sns; i++) { | |
63 | sn = &sn_tab[i]; | |
64 | if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) { | |
65 | *sn_info = *sn; | |
66 | ret = 0; | |
67 | break; | |
68 | } | |
69 | } | |
70 | g_free(sn_tab); | |
71 | return ret; | |
72 | } | |
73 | ||
2ea1dd75 WX |
74 | /** |
75 | * Look up an internal snapshot by @id and @name. | |
76 | * @bs: block device to search | |
77 | * @id: unique snapshot ID, or NULL | |
78 | * @name: snapshot name, or NULL | |
79 | * @sn_info: location to store information on the snapshot found | |
80 | * @errp: location to store error, will be set only for exception | |
81 | * | |
82 | * This function will traverse snapshot list in @bs to search the matching | |
83 | * one, @id and @name are the matching condition: | |
84 | * If both @id and @name are specified, find the first one with id @id and | |
85 | * name @name. | |
86 | * If only @id is specified, find the first one with id @id. | |
87 | * If only @name is specified, find the first one with name @name. | |
88 | * if none is specified, abort(). | |
89 | * | |
90 | * Returns: true when a snapshot is found and @sn_info will be filled, false | |
91 | * when error or not found. If all operation succeed but no matching one is | |
92 | * found, @errp will NOT be set. | |
93 | */ | |
94 | bool bdrv_snapshot_find_by_id_and_name(BlockDriverState *bs, | |
95 | const char *id, | |
96 | const char *name, | |
97 | QEMUSnapshotInfo *sn_info, | |
98 | Error **errp) | |
99 | { | |
100 | QEMUSnapshotInfo *sn_tab, *sn; | |
101 | int nb_sns, i; | |
102 | bool ret = false; | |
103 | ||
104 | assert(id || name); | |
105 | ||
106 | nb_sns = bdrv_snapshot_list(bs, &sn_tab); | |
107 | if (nb_sns < 0) { | |
108 | error_setg_errno(errp, -nb_sns, "Failed to get a snapshot list"); | |
109 | return false; | |
110 | } else if (nb_sns == 0) { | |
111 | return false; | |
112 | } | |
113 | ||
114 | if (id && name) { | |
115 | for (i = 0; i < nb_sns; i++) { | |
116 | sn = &sn_tab[i]; | |
117 | if (!strcmp(sn->id_str, id) && !strcmp(sn->name, name)) { | |
118 | *sn_info = *sn; | |
119 | ret = true; | |
120 | break; | |
121 | } | |
122 | } | |
123 | } else if (id) { | |
124 | for (i = 0; i < nb_sns; i++) { | |
125 | sn = &sn_tab[i]; | |
126 | if (!strcmp(sn->id_str, id)) { | |
127 | *sn_info = *sn; | |
128 | ret = true; | |
129 | break; | |
130 | } | |
131 | } | |
132 | } else if (name) { | |
133 | for (i = 0; i < nb_sns; i++) { | |
134 | sn = &sn_tab[i]; | |
135 | if (!strcmp(sn->name, name)) { | |
136 | *sn_info = *sn; | |
137 | ret = true; | |
138 | break; | |
139 | } | |
140 | } | |
141 | } | |
142 | ||
143 | g_free(sn_tab); | |
144 | return ret; | |
145 | } | |
146 | ||
de08c606 WX |
147 | int bdrv_can_snapshot(BlockDriverState *bs) |
148 | { | |
149 | BlockDriver *drv = bs->drv; | |
150 | if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { | |
151 | return 0; | |
152 | } | |
153 | ||
154 | if (!drv->bdrv_snapshot_create) { | |
155 | if (bs->file != NULL) { | |
9a4f4c31 | 156 | return bdrv_can_snapshot(bs->file->bs); |
de08c606 WX |
157 | } |
158 | return 0; | |
159 | } | |
160 | ||
161 | return 1; | |
162 | } | |
163 | ||
164 | int bdrv_snapshot_create(BlockDriverState *bs, | |
165 | QEMUSnapshotInfo *sn_info) | |
166 | { | |
167 | BlockDriver *drv = bs->drv; | |
168 | if (!drv) { | |
169 | return -ENOMEDIUM; | |
170 | } | |
171 | if (drv->bdrv_snapshot_create) { | |
172 | return drv->bdrv_snapshot_create(bs, sn_info); | |
173 | } | |
174 | if (bs->file) { | |
9a4f4c31 | 175 | return bdrv_snapshot_create(bs->file->bs, sn_info); |
de08c606 WX |
176 | } |
177 | return -ENOTSUP; | |
178 | } | |
179 | ||
180 | int bdrv_snapshot_goto(BlockDriverState *bs, | |
0b62bcbc KW |
181 | const char *snapshot_id, |
182 | Error **errp) | |
de08c606 WX |
183 | { |
184 | BlockDriver *drv = bs->drv; | |
185 | int ret, open_ret; | |
186 | ||
187 | if (!drv) { | |
0b62bcbc | 188 | error_setg(errp, "Block driver is closed"); |
de08c606 WX |
189 | return -ENOMEDIUM; |
190 | } | |
04dec3c3 | 191 | |
70a5afed KW |
192 | if (!QLIST_EMPTY(&bs->dirty_bitmaps)) { |
193 | error_setg(errp, "Device has active dirty bitmaps"); | |
194 | return -EBUSY; | |
04dec3c3 | 195 | } |
04dec3c3 | 196 | |
de08c606 | 197 | if (drv->bdrv_snapshot_goto) { |
0b62bcbc KW |
198 | ret = drv->bdrv_snapshot_goto(bs, snapshot_id); |
199 | if (ret < 0) { | |
200 | error_setg_errno(errp, -ret, "Failed to load snapshot"); | |
201 | } | |
202 | return ret; | |
de08c606 WX |
203 | } |
204 | ||
205 | if (bs->file) { | |
7a9e5119 DJS |
206 | BlockDriverState *file; |
207 | QDict *options = qdict_clone_shallow(bs->options); | |
208 | QDict *file_options; | |
0b62bcbc | 209 | Error *local_err = NULL; |
7a9e5119 DJS |
210 | |
211 | file = bs->file->bs; | |
212 | /* Prevent it from getting deleted when detached from bs */ | |
213 | bdrv_ref(file); | |
214 | ||
215 | qdict_extract_subqdict(options, &file_options, "file."); | |
216 | QDECREF(file_options); | |
46f5ac20 | 217 | qdict_put_str(options, "file", bdrv_get_node_name(file)); |
7a9e5119 | 218 | |
de08c606 | 219 | drv->bdrv_close(bs); |
7a9e5119 DJS |
220 | bdrv_unref_child(bs, bs->file); |
221 | bs->file = NULL; | |
222 | ||
0b62bcbc KW |
223 | ret = bdrv_snapshot_goto(file, snapshot_id, errp); |
224 | open_ret = drv->bdrv_open(bs, options, bs->open_flags, &local_err); | |
7a9e5119 | 225 | QDECREF(options); |
de08c606 | 226 | if (open_ret < 0) { |
7a9e5119 | 227 | bdrv_unref(file); |
de08c606 | 228 | bs->drv = NULL; |
0b62bcbc KW |
229 | /* A bdrv_snapshot_goto() error takes precedence */ |
230 | error_propagate(errp, local_err); | |
231 | return ret < 0 ? ret : open_ret; | |
de08c606 | 232 | } |
7a9e5119 DJS |
233 | |
234 | assert(bs->file->bs == file); | |
235 | bdrv_unref(file); | |
de08c606 WX |
236 | return ret; |
237 | } | |
238 | ||
0b62bcbc | 239 | error_setg(errp, "Block driver does not support snapshots"); |
de08c606 WX |
240 | return -ENOTSUP; |
241 | } | |
242 | ||
a89d89d3 WX |
243 | /** |
244 | * Delete an internal snapshot by @snapshot_id and @name. | |
245 | * @bs: block device used in the operation | |
246 | * @snapshot_id: unique snapshot ID, or NULL | |
247 | * @name: snapshot name, or NULL | |
248 | * @errp: location to store error | |
249 | * | |
250 | * If both @snapshot_id and @name are specified, delete the first one with | |
251 | * id @snapshot_id and name @name. | |
252 | * If only @snapshot_id is specified, delete the first one with id | |
253 | * @snapshot_id. | |
254 | * If only @name is specified, delete the first one with name @name. | |
7b4c4781 | 255 | * if none is specified, return -EINVAL. |
a89d89d3 WX |
256 | * |
257 | * Returns: 0 on success, -errno on failure. If @bs is not inserted, return | |
258 | * -ENOMEDIUM. If @snapshot_id and @name are both NULL, return -EINVAL. If @bs | |
259 | * does not support internal snapshot deletion, return -ENOTSUP. If @bs does | |
260 | * not support parameter @snapshot_id or @name, or one of them is not correctly | |
261 | * specified, return -EINVAL. If @bs can't find one matching @id and @name, | |
262 | * return -ENOENT. If @errp != NULL, it will always be filled with error | |
263 | * message on failure. | |
264 | */ | |
265 | int bdrv_snapshot_delete(BlockDriverState *bs, | |
266 | const char *snapshot_id, | |
267 | const char *name, | |
268 | Error **errp) | |
de08c606 WX |
269 | { |
270 | BlockDriver *drv = bs->drv; | |
27a7649a PB |
271 | int ret; |
272 | ||
de08c606 | 273 | if (!drv) { |
c6bd8c70 | 274 | error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs)); |
de08c606 WX |
275 | return -ENOMEDIUM; |
276 | } | |
a89d89d3 WX |
277 | if (!snapshot_id && !name) { |
278 | error_setg(errp, "snapshot_id and name are both NULL"); | |
279 | return -EINVAL; | |
280 | } | |
3432a192 ZH |
281 | |
282 | /* drain all pending i/o before deleting snapshot */ | |
27a7649a | 283 | bdrv_drained_begin(bs); |
3432a192 | 284 | |
de08c606 | 285 | if (drv->bdrv_snapshot_delete) { |
27a7649a PB |
286 | ret = drv->bdrv_snapshot_delete(bs, snapshot_id, name, errp); |
287 | } else if (bs->file) { | |
288 | ret = bdrv_snapshot_delete(bs->file->bs, snapshot_id, name, errp); | |
289 | } else { | |
290 | error_setg(errp, "Block format '%s' used by device '%s' " | |
291 | "does not support internal snapshot deletion", | |
292 | drv->format_name, bdrv_get_device_name(bs)); | |
293 | ret = -ENOTSUP; | |
de08c606 | 294 | } |
27a7649a PB |
295 | |
296 | bdrv_drained_end(bs); | |
297 | return ret; | |
de08c606 WX |
298 | } |
299 | ||
25af925f DL |
300 | int bdrv_snapshot_delete_by_id_or_name(BlockDriverState *bs, |
301 | const char *id_or_name, | |
302 | Error **errp) | |
a89d89d3 WX |
303 | { |
304 | int ret; | |
305 | Error *local_err = NULL; | |
306 | ||
307 | ret = bdrv_snapshot_delete(bs, id_or_name, NULL, &local_err); | |
308 | if (ret == -ENOENT || ret == -EINVAL) { | |
309 | error_free(local_err); | |
310 | local_err = NULL; | |
311 | ret = bdrv_snapshot_delete(bs, NULL, id_or_name, &local_err); | |
312 | } | |
313 | ||
314 | if (ret < 0) { | |
315 | error_propagate(errp, local_err); | |
316 | } | |
25af925f | 317 | return ret; |
a89d89d3 WX |
318 | } |
319 | ||
de08c606 WX |
320 | int bdrv_snapshot_list(BlockDriverState *bs, |
321 | QEMUSnapshotInfo **psn_info) | |
322 | { | |
323 | BlockDriver *drv = bs->drv; | |
324 | if (!drv) { | |
325 | return -ENOMEDIUM; | |
326 | } | |
327 | if (drv->bdrv_snapshot_list) { | |
328 | return drv->bdrv_snapshot_list(bs, psn_info); | |
329 | } | |
330 | if (bs->file) { | |
9a4f4c31 | 331 | return bdrv_snapshot_list(bs->file->bs, psn_info); |
de08c606 WX |
332 | } |
333 | return -ENOTSUP; | |
334 | } | |
335 | ||
7b4c4781 WX |
336 | /** |
337 | * Temporarily load an internal snapshot by @snapshot_id and @name. | |
338 | * @bs: block device used in the operation | |
339 | * @snapshot_id: unique snapshot ID, or NULL | |
340 | * @name: snapshot name, or NULL | |
341 | * @errp: location to store error | |
342 | * | |
343 | * If both @snapshot_id and @name are specified, load the first one with | |
344 | * id @snapshot_id and name @name. | |
345 | * If only @snapshot_id is specified, load the first one with id | |
346 | * @snapshot_id. | |
347 | * If only @name is specified, load the first one with name @name. | |
348 | * if none is specified, return -EINVAL. | |
349 | * | |
350 | * Returns: 0 on success, -errno on fail. If @bs is not inserted, return | |
351 | * -ENOMEDIUM. If @bs is not readonly, return -EINVAL. If @bs did not support | |
352 | * internal snapshot, return -ENOTSUP. If qemu can't find a matching @id and | |
353 | * @name, return -ENOENT. If @errp != NULL, it will always be filled on | |
354 | * failure. | |
355 | */ | |
de08c606 | 356 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, |
7b4c4781 WX |
357 | const char *snapshot_id, |
358 | const char *name, | |
359 | Error **errp) | |
de08c606 WX |
360 | { |
361 | BlockDriver *drv = bs->drv; | |
7b4c4781 | 362 | |
de08c606 | 363 | if (!drv) { |
c6bd8c70 | 364 | error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs)); |
de08c606 WX |
365 | return -ENOMEDIUM; |
366 | } | |
7b4c4781 WX |
367 | if (!snapshot_id && !name) { |
368 | error_setg(errp, "snapshot_id and name are both NULL"); | |
369 | return -EINVAL; | |
370 | } | |
de08c606 | 371 | if (!bs->read_only) { |
7b4c4781 | 372 | error_setg(errp, "Device is not readonly"); |
de08c606 WX |
373 | return -EINVAL; |
374 | } | |
375 | if (drv->bdrv_snapshot_load_tmp) { | |
7b4c4781 | 376 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_id, name, errp); |
de08c606 | 377 | } |
81e5f78a AG |
378 | error_setg(errp, "Block format '%s' used by device '%s' " |
379 | "does not support temporarily loading internal snapshots", | |
380 | drv->format_name, bdrv_get_device_name(bs)); | |
de08c606 WX |
381 | return -ENOTSUP; |
382 | } | |
7b4c4781 WX |
383 | |
384 | int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs, | |
385 | const char *id_or_name, | |
386 | Error **errp) | |
387 | { | |
388 | int ret; | |
389 | Error *local_err = NULL; | |
390 | ||
391 | ret = bdrv_snapshot_load_tmp(bs, id_or_name, NULL, &local_err); | |
392 | if (ret == -ENOENT || ret == -EINVAL) { | |
393 | error_free(local_err); | |
394 | local_err = NULL; | |
395 | ret = bdrv_snapshot_load_tmp(bs, NULL, id_or_name, &local_err); | |
396 | } | |
397 | ||
621ff94d | 398 | error_propagate(errp, local_err); |
7b4c4781 WX |
399 | |
400 | return ret; | |
401 | } | |
e9ff957a DL |
402 | |
403 | ||
404 | /* Group operations. All block drivers are involved. | |
405 | * These functions will properly handle dataplane (take aio_context_acquire | |
406 | * when appropriate for appropriate block drivers) */ | |
407 | ||
408 | bool bdrv_all_can_snapshot(BlockDriverState **first_bad_bs) | |
409 | { | |
410 | bool ok = true; | |
7c8eece4 | 411 | BlockDriverState *bs; |
88be7b4b | 412 | BdrvNextIterator it; |
e9ff957a | 413 | |
88be7b4b | 414 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
e9ff957a DL |
415 | AioContext *ctx = bdrv_get_aio_context(bs); |
416 | ||
417 | aio_context_acquire(ctx); | |
418 | if (bdrv_is_inserted(bs) && !bdrv_is_read_only(bs)) { | |
419 | ok = bdrv_can_snapshot(bs); | |
420 | } | |
421 | aio_context_release(ctx); | |
88be7b4b | 422 | if (!ok) { |
5e003f17 | 423 | bdrv_next_cleanup(&it); |
88be7b4b KW |
424 | goto fail; |
425 | } | |
e9ff957a DL |
426 | } |
427 | ||
88be7b4b | 428 | fail: |
e9ff957a DL |
429 | *first_bad_bs = bs; |
430 | return ok; | |
431 | } | |
9b00ea37 DL |
432 | |
433 | int bdrv_all_delete_snapshot(const char *name, BlockDriverState **first_bad_bs, | |
434 | Error **err) | |
435 | { | |
436 | int ret = 0; | |
7c8eece4 | 437 | BlockDriverState *bs; |
88be7b4b | 438 | BdrvNextIterator it; |
9b00ea37 DL |
439 | QEMUSnapshotInfo sn1, *snapshot = &sn1; |
440 | ||
88be7b4b | 441 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
9b00ea37 DL |
442 | AioContext *ctx = bdrv_get_aio_context(bs); |
443 | ||
444 | aio_context_acquire(ctx); | |
445 | if (bdrv_can_snapshot(bs) && | |
446 | bdrv_snapshot_find(bs, snapshot, name) >= 0) { | |
447 | ret = bdrv_snapshot_delete_by_id_or_name(bs, name, err); | |
448 | } | |
449 | aio_context_release(ctx); | |
88be7b4b | 450 | if (ret < 0) { |
5e003f17 | 451 | bdrv_next_cleanup(&it); |
88be7b4b KW |
452 | goto fail; |
453 | } | |
9b00ea37 DL |
454 | } |
455 | ||
88be7b4b | 456 | fail: |
9b00ea37 DL |
457 | *first_bad_bs = bs; |
458 | return ret; | |
459 | } | |
4c1cdbaa DL |
460 | |
461 | ||
2b624fe0 KW |
462 | int bdrv_all_goto_snapshot(const char *name, BlockDriverState **first_bad_bs, |
463 | Error **errp) | |
4c1cdbaa | 464 | { |
2b624fe0 | 465 | int ret = 0; |
7c8eece4 | 466 | BlockDriverState *bs; |
88be7b4b | 467 | BdrvNextIterator it; |
4c1cdbaa | 468 | |
88be7b4b | 469 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
4c1cdbaa DL |
470 | AioContext *ctx = bdrv_get_aio_context(bs); |
471 | ||
472 | aio_context_acquire(ctx); | |
473 | if (bdrv_can_snapshot(bs)) { | |
2b624fe0 | 474 | ret = bdrv_snapshot_goto(bs, name, errp); |
4c1cdbaa DL |
475 | } |
476 | aio_context_release(ctx); | |
2b624fe0 | 477 | if (ret < 0) { |
5e003f17 | 478 | bdrv_next_cleanup(&it); |
88be7b4b KW |
479 | goto fail; |
480 | } | |
4c1cdbaa DL |
481 | } |
482 | ||
88be7b4b | 483 | fail: |
4c1cdbaa | 484 | *first_bad_bs = bs; |
2b624fe0 | 485 | return ret; |
4c1cdbaa | 486 | } |
723ccda1 DL |
487 | |
488 | int bdrv_all_find_snapshot(const char *name, BlockDriverState **first_bad_bs) | |
489 | { | |
490 | QEMUSnapshotInfo sn; | |
491 | int err = 0; | |
7c8eece4 | 492 | BlockDriverState *bs; |
88be7b4b | 493 | BdrvNextIterator it; |
723ccda1 | 494 | |
88be7b4b | 495 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
723ccda1 DL |
496 | AioContext *ctx = bdrv_get_aio_context(bs); |
497 | ||
498 | aio_context_acquire(ctx); | |
499 | if (bdrv_can_snapshot(bs)) { | |
500 | err = bdrv_snapshot_find(bs, &sn, name); | |
501 | } | |
502 | aio_context_release(ctx); | |
88be7b4b | 503 | if (err < 0) { |
5e003f17 | 504 | bdrv_next_cleanup(&it); |
88be7b4b KW |
505 | goto fail; |
506 | } | |
723ccda1 DL |
507 | } |
508 | ||
88be7b4b | 509 | fail: |
723ccda1 DL |
510 | *first_bad_bs = bs; |
511 | return err; | |
512 | } | |
a9085f9b DL |
513 | |
514 | int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, | |
515 | BlockDriverState *vm_state_bs, | |
516 | uint64_t vm_state_size, | |
517 | BlockDriverState **first_bad_bs) | |
518 | { | |
519 | int err = 0; | |
7c8eece4 | 520 | BlockDriverState *bs; |
88be7b4b | 521 | BdrvNextIterator it; |
a9085f9b | 522 | |
88be7b4b | 523 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
a9085f9b DL |
524 | AioContext *ctx = bdrv_get_aio_context(bs); |
525 | ||
526 | aio_context_acquire(ctx); | |
527 | if (bs == vm_state_bs) { | |
528 | sn->vm_state_size = vm_state_size; | |
529 | err = bdrv_snapshot_create(bs, sn); | |
530 | } else if (bdrv_can_snapshot(bs)) { | |
531 | sn->vm_state_size = 0; | |
532 | err = bdrv_snapshot_create(bs, sn); | |
533 | } | |
534 | aio_context_release(ctx); | |
88be7b4b | 535 | if (err < 0) { |
5e003f17 | 536 | bdrv_next_cleanup(&it); |
88be7b4b KW |
537 | goto fail; |
538 | } | |
a9085f9b DL |
539 | } |
540 | ||
88be7b4b | 541 | fail: |
a9085f9b DL |
542 | *first_bad_bs = bs; |
543 | return err; | |
544 | } | |
7cb14481 DL |
545 | |
546 | BlockDriverState *bdrv_all_find_vmstate_bs(void) | |
547 | { | |
7c8eece4 | 548 | BlockDriverState *bs; |
88be7b4b | 549 | BdrvNextIterator it; |
7cb14481 | 550 | |
88be7b4b | 551 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
7cb14481 | 552 | AioContext *ctx = bdrv_get_aio_context(bs); |
88be7b4b | 553 | bool found; |
7cb14481 DL |
554 | |
555 | aio_context_acquire(ctx); | |
88be7b4b | 556 | found = bdrv_can_snapshot(bs); |
7cb14481 | 557 | aio_context_release(ctx); |
88be7b4b KW |
558 | |
559 | if (found) { | |
5e003f17 | 560 | bdrv_next_cleanup(&it); |
88be7b4b KW |
561 | break; |
562 | } | |
7cb14481 DL |
563 | } |
564 | return bs; | |
565 | } |