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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" | |
609f45ea | 28 | #include "block/qdict.h" |
da34e65c | 29 | #include "qapi/error.h" |
452fcdbc | 30 | #include "qapi/qmp/qdict.h" |
cc7a8ea7 | 31 | #include "qapi/qmp/qerror.h" |
7a9e5119 | 32 | #include "qapi/qmp/qstring.h" |
922a01a0 | 33 | #include "qemu/option.h" |
05f4aced | 34 | #include "sysemu/block-backend.h" |
de08c606 | 35 | |
8c116b0e WX |
36 | QemuOptsList internal_snapshot_opts = { |
37 | .name = "snapshot", | |
38 | .head = QTAILQ_HEAD_INITIALIZER(internal_snapshot_opts.head), | |
39 | .desc = { | |
40 | { | |
41 | .name = SNAPSHOT_OPT_ID, | |
42 | .type = QEMU_OPT_STRING, | |
43 | .help = "snapshot id" | |
44 | },{ | |
45 | .name = SNAPSHOT_OPT_NAME, | |
46 | .type = QEMU_OPT_STRING, | |
47 | .help = "snapshot name" | |
48 | },{ | |
49 | /* end of list */ | |
50 | } | |
51 | }, | |
52 | }; | |
53 | ||
de08c606 WX |
54 | int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info, |
55 | const char *name) | |
56 | { | |
57 | QEMUSnapshotInfo *sn_tab, *sn; | |
58 | int nb_sns, i, ret; | |
59 | ||
6b573efe EGE |
60 | GLOBAL_STATE_CODE(); |
61 | ||
de08c606 WX |
62 | ret = -ENOENT; |
63 | nb_sns = bdrv_snapshot_list(bs, &sn_tab); | |
64 | if (nb_sns < 0) { | |
65 | return ret; | |
66 | } | |
67 | for (i = 0; i < nb_sns; i++) { | |
68 | sn = &sn_tab[i]; | |
6ca08045 | 69 | if (!strcmp(sn->name, name)) { |
de08c606 WX |
70 | *sn_info = *sn; |
71 | ret = 0; | |
72 | break; | |
73 | } | |
74 | } | |
75 | g_free(sn_tab); | |
76 | return ret; | |
77 | } | |
78 | ||
2ea1dd75 WX |
79 | /** |
80 | * Look up an internal snapshot by @id and @name. | |
81 | * @bs: block device to search | |
82 | * @id: unique snapshot ID, or NULL | |
83 | * @name: snapshot name, or NULL | |
84 | * @sn_info: location to store information on the snapshot found | |
85 | * @errp: location to store error, will be set only for exception | |
86 | * | |
87 | * This function will traverse snapshot list in @bs to search the matching | |
88 | * one, @id and @name are the matching condition: | |
89 | * If both @id and @name are specified, find the first one with id @id and | |
90 | * name @name. | |
91 | * If only @id is specified, find the first one with id @id. | |
92 | * If only @name is specified, find the first one with name @name. | |
93 | * if none is specified, abort(). | |
94 | * | |
95 | * Returns: true when a snapshot is found and @sn_info will be filled, false | |
96 | * when error or not found. If all operation succeed but no matching one is | |
97 | * found, @errp will NOT be set. | |
98 | */ | |
99 | bool bdrv_snapshot_find_by_id_and_name(BlockDriverState *bs, | |
100 | const char *id, | |
101 | const char *name, | |
102 | QEMUSnapshotInfo *sn_info, | |
103 | Error **errp) | |
104 | { | |
105 | QEMUSnapshotInfo *sn_tab, *sn; | |
106 | int nb_sns, i; | |
107 | bool ret = false; | |
108 | ||
109 | assert(id || name); | |
6b573efe | 110 | GLOBAL_STATE_CODE(); |
2ea1dd75 WX |
111 | |
112 | nb_sns = bdrv_snapshot_list(bs, &sn_tab); | |
113 | if (nb_sns < 0) { | |
114 | error_setg_errno(errp, -nb_sns, "Failed to get a snapshot list"); | |
115 | return false; | |
116 | } else if (nb_sns == 0) { | |
117 | return false; | |
118 | } | |
119 | ||
120 | if (id && name) { | |
121 | for (i = 0; i < nb_sns; i++) { | |
122 | sn = &sn_tab[i]; | |
123 | if (!strcmp(sn->id_str, id) && !strcmp(sn->name, name)) { | |
124 | *sn_info = *sn; | |
125 | ret = true; | |
126 | break; | |
127 | } | |
128 | } | |
129 | } else if (id) { | |
130 | for (i = 0; i < nb_sns; i++) { | |
131 | sn = &sn_tab[i]; | |
132 | if (!strcmp(sn->id_str, id)) { | |
133 | *sn_info = *sn; | |
134 | ret = true; | |
135 | break; | |
136 | } | |
137 | } | |
138 | } else if (name) { | |
139 | for (i = 0; i < nb_sns; i++) { | |
140 | sn = &sn_tab[i]; | |
141 | if (!strcmp(sn->name, name)) { | |
142 | *sn_info = *sn; | |
143 | ret = true; | |
144 | break; | |
145 | } | |
146 | } | |
147 | } | |
148 | ||
149 | g_free(sn_tab); | |
150 | return ret; | |
151 | } | |
152 | ||
c8af8757 | 153 | /** |
c5c21741 | 154 | * Return a pointer to child of given BDS to which we can fall |
c8af8757 HR |
155 | * back if the given BDS does not support snapshots. |
156 | * Return NULL if there is no BDS to (safely) fall back to. | |
c8af8757 | 157 | */ |
c5c21741 | 158 | static BdrvChild *bdrv_snapshot_fallback_child(BlockDriverState *bs) |
c8af8757 | 159 | { |
c5c21741 VSO |
160 | BdrvChild *fallback = bdrv_primary_child(bs); |
161 | BdrvChild *child; | |
c8af8757 | 162 | |
0c6100a7 | 163 | /* We allow fallback only to primary child */ |
c5c21741 | 164 | if (!fallback) { |
c8af8757 HR |
165 | return NULL; |
166 | } | |
167 | ||
168 | /* | |
169 | * Check that there are no other children that would need to be | |
170 | * snapshotted. If there are, it is not safe to fall back to | |
c5c21741 | 171 | * fallback. |
c8af8757 HR |
172 | */ |
173 | QLIST_FOREACH(child, &bs->children, next) { | |
174 | if (child->role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA | | |
175 | BDRV_CHILD_FILTERED) && | |
c5c21741 | 176 | child != fallback) |
c8af8757 HR |
177 | { |
178 | return NULL; | |
179 | } | |
180 | } | |
181 | ||
182 | return fallback; | |
183 | } | |
184 | ||
185 | static BlockDriverState *bdrv_snapshot_fallback(BlockDriverState *bs) | |
186 | { | |
c5c21741 | 187 | return child_bs(bdrv_snapshot_fallback_child(bs)); |
c8af8757 HR |
188 | } |
189 | ||
de08c606 WX |
190 | int bdrv_can_snapshot(BlockDriverState *bs) |
191 | { | |
192 | BlockDriver *drv = bs->drv; | |
6b573efe | 193 | GLOBAL_STATE_CODE(); |
de08c606 WX |
194 | if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
195 | return 0; | |
196 | } | |
197 | ||
198 | if (!drv->bdrv_snapshot_create) { | |
c8af8757 HR |
199 | BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs); |
200 | if (fallback_bs) { | |
201 | return bdrv_can_snapshot(fallback_bs); | |
de08c606 WX |
202 | } |
203 | return 0; | |
204 | } | |
205 | ||
206 | return 1; | |
207 | } | |
208 | ||
209 | int bdrv_snapshot_create(BlockDriverState *bs, | |
210 | QEMUSnapshotInfo *sn_info) | |
211 | { | |
212 | BlockDriver *drv = bs->drv; | |
c8af8757 | 213 | BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs); |
6b573efe EGE |
214 | |
215 | GLOBAL_STATE_CODE(); | |
216 | ||
de08c606 WX |
217 | if (!drv) { |
218 | return -ENOMEDIUM; | |
219 | } | |
220 | if (drv->bdrv_snapshot_create) { | |
221 | return drv->bdrv_snapshot_create(bs, sn_info); | |
222 | } | |
c8af8757 HR |
223 | if (fallback_bs) { |
224 | return bdrv_snapshot_create(fallback_bs, sn_info); | |
de08c606 WX |
225 | } |
226 | return -ENOTSUP; | |
227 | } | |
228 | ||
229 | int bdrv_snapshot_goto(BlockDriverState *bs, | |
0b62bcbc KW |
230 | const char *snapshot_id, |
231 | Error **errp) | |
de08c606 WX |
232 | { |
233 | BlockDriver *drv = bs->drv; | |
c5c21741 | 234 | BdrvChild *fallback; |
de08c606 WX |
235 | int ret, open_ret; |
236 | ||
6b573efe EGE |
237 | GLOBAL_STATE_CODE(); |
238 | ||
de08c606 | 239 | if (!drv) { |
0b62bcbc | 240 | error_setg(errp, "Block driver is closed"); |
de08c606 WX |
241 | return -ENOMEDIUM; |
242 | } | |
04dec3c3 | 243 | |
70a5afed KW |
244 | if (!QLIST_EMPTY(&bs->dirty_bitmaps)) { |
245 | error_setg(errp, "Device has active dirty bitmaps"); | |
246 | return -EBUSY; | |
04dec3c3 | 247 | } |
04dec3c3 | 248 | |
de08c606 | 249 | if (drv->bdrv_snapshot_goto) { |
0b62bcbc KW |
250 | ret = drv->bdrv_snapshot_goto(bs, snapshot_id); |
251 | if (ret < 0) { | |
252 | error_setg_errno(errp, -ret, "Failed to load snapshot"); | |
253 | } | |
254 | return ret; | |
de08c606 WX |
255 | } |
256 | ||
c5c21741 VSO |
257 | fallback = bdrv_snapshot_fallback_child(bs); |
258 | if (fallback) { | |
c8af8757 | 259 | QDict *options; |
7a9e5119 | 260 | QDict *file_options; |
0b62bcbc | 261 | Error *local_err = NULL; |
c5c21741 VSO |
262 | BlockDriverState *fallback_bs = fallback->bs; |
263 | char *subqdict_prefix = g_strdup_printf("%s.", fallback->name); | |
c8af8757 HR |
264 | |
265 | options = qdict_clone_shallow(bs->options); | |
7a9e5119 | 266 | |
7a9e5119 | 267 | /* Prevent it from getting deleted when detached from bs */ |
c8af8757 | 268 | bdrv_ref(fallback_bs); |
7a9e5119 | 269 | |
c8af8757 | 270 | qdict_extract_subqdict(options, &file_options, subqdict_prefix); |
cb3e7f08 | 271 | qobject_unref(file_options); |
c8af8757 HR |
272 | g_free(subqdict_prefix); |
273 | ||
c5c21741 VSO |
274 | /* Force .bdrv_open() below to re-attach fallback_bs on fallback */ |
275 | qdict_put_str(options, fallback->name, | |
c8af8757 | 276 | bdrv_get_node_name(fallback_bs)); |
7a9e5119 | 277 | |
32a9a245 | 278 | /* Now close bs, apply the snapshot on fallback_bs, and re-open bs */ |
3c005293 VSO |
279 | if (drv->bdrv_close) { |
280 | drv->bdrv_close(bs); | |
281 | } | |
7a9e5119 | 282 | |
32a9a245 | 283 | /* .bdrv_open() will re-attach it */ |
32a8aba3 | 284 | bdrv_graph_wrlock(NULL); |
c5c21741 | 285 | bdrv_unref_child(bs, fallback); |
32a8aba3 | 286 | bdrv_graph_wrunlock(); |
c8af8757 HR |
287 | |
288 | ret = bdrv_snapshot_goto(fallback_bs, snapshot_id, errp); | |
0b62bcbc | 289 | open_ret = drv->bdrv_open(bs, options, bs->open_flags, &local_err); |
cb3e7f08 | 290 | qobject_unref(options); |
de08c606 | 291 | if (open_ret < 0) { |
c8af8757 | 292 | bdrv_unref(fallback_bs); |
de08c606 | 293 | bs->drv = NULL; |
0b62bcbc KW |
294 | /* A bdrv_snapshot_goto() error takes precedence */ |
295 | error_propagate(errp, local_err); | |
296 | return ret < 0 ? ret : open_ret; | |
de08c606 | 297 | } |
7a9e5119 | 298 | |
32a9a245 | 299 | /* |
0c6100a7 VSO |
300 | * fallback was a primary child. It was closed above and set to NULL, |
301 | * but the .bdrv_open() call has opened it again, because we set the | |
302 | * respective option (with the qdict_put_str() call above). | |
303 | * Assert that .bdrv_open() has attached the right BDS as primary child. | |
32a9a245 | 304 | */ |
0c6100a7 | 305 | assert(bdrv_primary_bs(bs) == fallback_bs); |
c8af8757 | 306 | bdrv_unref(fallback_bs); |
de08c606 WX |
307 | return ret; |
308 | } | |
309 | ||
0b62bcbc | 310 | error_setg(errp, "Block driver does not support snapshots"); |
de08c606 WX |
311 | return -ENOTSUP; |
312 | } | |
313 | ||
a89d89d3 WX |
314 | /** |
315 | * Delete an internal snapshot by @snapshot_id and @name. | |
316 | * @bs: block device used in the operation | |
317 | * @snapshot_id: unique snapshot ID, or NULL | |
318 | * @name: snapshot name, or NULL | |
319 | * @errp: location to store error | |
320 | * | |
321 | * If both @snapshot_id and @name are specified, delete the first one with | |
322 | * id @snapshot_id and name @name. | |
323 | * If only @snapshot_id is specified, delete the first one with id | |
324 | * @snapshot_id. | |
325 | * If only @name is specified, delete the first one with name @name. | |
7b4c4781 | 326 | * if none is specified, return -EINVAL. |
a89d89d3 WX |
327 | * |
328 | * Returns: 0 on success, -errno on failure. If @bs is not inserted, return | |
329 | * -ENOMEDIUM. If @snapshot_id and @name are both NULL, return -EINVAL. If @bs | |
330 | * does not support internal snapshot deletion, return -ENOTSUP. If @bs does | |
331 | * not support parameter @snapshot_id or @name, or one of them is not correctly | |
332 | * specified, return -EINVAL. If @bs can't find one matching @id and @name, | |
333 | * return -ENOENT. If @errp != NULL, it will always be filled with error | |
334 | * message on failure. | |
335 | */ | |
336 | int bdrv_snapshot_delete(BlockDriverState *bs, | |
337 | const char *snapshot_id, | |
338 | const char *name, | |
339 | Error **errp) | |
de08c606 WX |
340 | { |
341 | BlockDriver *drv = bs->drv; | |
c8af8757 | 342 | BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs); |
27a7649a PB |
343 | int ret; |
344 | ||
6b573efe EGE |
345 | GLOBAL_STATE_CODE(); |
346 | ||
de08c606 | 347 | if (!drv) { |
c6bd8c70 | 348 | error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs)); |
de08c606 WX |
349 | return -ENOMEDIUM; |
350 | } | |
a89d89d3 WX |
351 | if (!snapshot_id && !name) { |
352 | error_setg(errp, "snapshot_id and name are both NULL"); | |
353 | return -EINVAL; | |
354 | } | |
3432a192 ZH |
355 | |
356 | /* drain all pending i/o before deleting snapshot */ | |
27a7649a | 357 | bdrv_drained_begin(bs); |
3432a192 | 358 | |
de08c606 | 359 | if (drv->bdrv_snapshot_delete) { |
27a7649a | 360 | ret = drv->bdrv_snapshot_delete(bs, snapshot_id, name, errp); |
c8af8757 HR |
361 | } else if (fallback_bs) { |
362 | ret = bdrv_snapshot_delete(fallback_bs, snapshot_id, name, errp); | |
27a7649a PB |
363 | } else { |
364 | error_setg(errp, "Block format '%s' used by device '%s' " | |
365 | "does not support internal snapshot deletion", | |
366 | drv->format_name, bdrv_get_device_name(bs)); | |
367 | ret = -ENOTSUP; | |
de08c606 | 368 | } |
27a7649a PB |
369 | |
370 | bdrv_drained_end(bs); | |
371 | return ret; | |
de08c606 WX |
372 | } |
373 | ||
374 | int bdrv_snapshot_list(BlockDriverState *bs, | |
375 | QEMUSnapshotInfo **psn_info) | |
376 | { | |
377 | BlockDriver *drv = bs->drv; | |
c8af8757 | 378 | BlockDriverState *fallback_bs = bdrv_snapshot_fallback(bs); |
6b573efe EGE |
379 | |
380 | GLOBAL_STATE_CODE(); | |
de08c606 WX |
381 | if (!drv) { |
382 | return -ENOMEDIUM; | |
383 | } | |
384 | if (drv->bdrv_snapshot_list) { | |
385 | return drv->bdrv_snapshot_list(bs, psn_info); | |
386 | } | |
c8af8757 HR |
387 | if (fallback_bs) { |
388 | return bdrv_snapshot_list(fallback_bs, psn_info); | |
de08c606 WX |
389 | } |
390 | return -ENOTSUP; | |
391 | } | |
392 | ||
7b4c4781 WX |
393 | /** |
394 | * Temporarily load an internal snapshot by @snapshot_id and @name. | |
395 | * @bs: block device used in the operation | |
396 | * @snapshot_id: unique snapshot ID, or NULL | |
397 | * @name: snapshot name, or NULL | |
398 | * @errp: location to store error | |
399 | * | |
400 | * If both @snapshot_id and @name are specified, load the first one with | |
401 | * id @snapshot_id and name @name. | |
402 | * If only @snapshot_id is specified, load the first one with id | |
403 | * @snapshot_id. | |
404 | * If only @name is specified, load the first one with name @name. | |
405 | * if none is specified, return -EINVAL. | |
406 | * | |
407 | * Returns: 0 on success, -errno on fail. If @bs is not inserted, return | |
408 | * -ENOMEDIUM. If @bs is not readonly, return -EINVAL. If @bs did not support | |
409 | * internal snapshot, return -ENOTSUP. If qemu can't find a matching @id and | |
410 | * @name, return -ENOENT. If @errp != NULL, it will always be filled on | |
411 | * failure. | |
412 | */ | |
de08c606 | 413 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, |
7b4c4781 WX |
414 | const char *snapshot_id, |
415 | const char *name, | |
416 | Error **errp) | |
de08c606 WX |
417 | { |
418 | BlockDriver *drv = bs->drv; | |
7b4c4781 | 419 | |
6b573efe EGE |
420 | GLOBAL_STATE_CODE(); |
421 | ||
de08c606 | 422 | if (!drv) { |
c6bd8c70 | 423 | error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs)); |
de08c606 WX |
424 | return -ENOMEDIUM; |
425 | } | |
7b4c4781 WX |
426 | if (!snapshot_id && !name) { |
427 | error_setg(errp, "snapshot_id and name are both NULL"); | |
428 | return -EINVAL; | |
429 | } | |
307261b2 | 430 | if (!bdrv_is_read_only(bs)) { |
7b4c4781 | 431 | error_setg(errp, "Device is not readonly"); |
de08c606 WX |
432 | return -EINVAL; |
433 | } | |
434 | if (drv->bdrv_snapshot_load_tmp) { | |
7b4c4781 | 435 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_id, name, errp); |
de08c606 | 436 | } |
81e5f78a AG |
437 | error_setg(errp, "Block format '%s' used by device '%s' " |
438 | "does not support temporarily loading internal snapshots", | |
439 | drv->format_name, bdrv_get_device_name(bs)); | |
de08c606 WX |
440 | return -ENOTSUP; |
441 | } | |
7b4c4781 WX |
442 | |
443 | int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs, | |
444 | const char *id_or_name, | |
445 | Error **errp) | |
446 | { | |
447 | int ret; | |
448 | Error *local_err = NULL; | |
449 | ||
6b573efe EGE |
450 | GLOBAL_STATE_CODE(); |
451 | ||
7b4c4781 WX |
452 | ret = bdrv_snapshot_load_tmp(bs, id_or_name, NULL, &local_err); |
453 | if (ret == -ENOENT || ret == -EINVAL) { | |
454 | error_free(local_err); | |
455 | local_err = NULL; | |
456 | ret = bdrv_snapshot_load_tmp(bs, NULL, id_or_name, &local_err); | |
457 | } | |
458 | ||
621ff94d | 459 | error_propagate(errp, local_err); |
7b4c4781 WX |
460 | |
461 | return ret; | |
462 | } | |
e9ff957a | 463 | |
cf3a74c9 DB |
464 | |
465 | static int bdrv_all_get_snapshot_devices(bool has_devices, strList *devices, | |
466 | GList **all_bdrvs, | |
467 | Error **errp) | |
468 | { | |
469 | g_autoptr(GList) bdrvs = NULL; | |
470 | ||
471 | if (has_devices) { | |
472 | if (!devices) { | |
473 | error_setg(errp, "At least one device is required for snapshot"); | |
474 | return -1; | |
475 | } | |
476 | ||
477 | while (devices) { | |
478 | BlockDriverState *bs = bdrv_find_node(devices->value); | |
479 | if (!bs) { | |
480 | error_setg(errp, "No block device node '%s'", devices->value); | |
481 | return -1; | |
482 | } | |
483 | bdrvs = g_list_append(bdrvs, bs); | |
484 | devices = devices->next; | |
485 | } | |
486 | } else { | |
487 | BlockDriverState *bs; | |
488 | BdrvNextIterator it; | |
489 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { | |
490 | bdrvs = g_list_append(bdrvs, bs); | |
491 | } | |
492 | } | |
493 | ||
494 | *all_bdrvs = g_steal_pointer(&bdrvs); | |
495 | return 0; | |
496 | } | |
497 | ||
498 | ||
05f4aced KW |
499 | static bool bdrv_all_snapshots_includes_bs(BlockDriverState *bs) |
500 | { | |
501 | if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { | |
502 | return false; | |
503 | } | |
504 | ||
505 | /* Include all nodes that are either in use by a BlockBackend, or that | |
506 | * aren't attached to any node, but owned by the monitor. */ | |
507 | return bdrv_has_blk(bs) || QLIST_EMPTY(&bs->parents); | |
508 | } | |
e9ff957a DL |
509 | |
510 | /* Group operations. All block drivers are involved. | |
511 | * These functions will properly handle dataplane (take aio_context_acquire | |
512 | * when appropriate for appropriate block drivers) */ | |
513 | ||
cf3a74c9 DB |
514 | bool bdrv_all_can_snapshot(bool has_devices, strList *devices, |
515 | Error **errp) | |
e9ff957a | 516 | { |
cf3a74c9 DB |
517 | g_autoptr(GList) bdrvs = NULL; |
518 | GList *iterbdrvs; | |
e9ff957a | 519 | |
6b573efe EGE |
520 | GLOBAL_STATE_CODE(); |
521 | ||
cf3a74c9 DB |
522 | if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { |
523 | return false; | |
524 | } | |
525 | ||
526 | iterbdrvs = bdrvs; | |
527 | while (iterbdrvs) { | |
528 | BlockDriverState *bs = iterbdrvs->data; | |
e9ff957a | 529 | AioContext *ctx = bdrv_get_aio_context(bs); |
e26f98e2 | 530 | bool ok = true; |
e9ff957a DL |
531 | |
532 | aio_context_acquire(ctx); | |
cf3a74c9 | 533 | if (devices || bdrv_all_snapshots_includes_bs(bs)) { |
e9ff957a DL |
534 | ok = bdrv_can_snapshot(bs); |
535 | } | |
536 | aio_context_release(ctx); | |
88be7b4b | 537 | if (!ok) { |
e26f98e2 DB |
538 | error_setg(errp, "Device '%s' is writable but does not support " |
539 | "snapshots", bdrv_get_device_or_node_name(bs)); | |
e26f98e2 | 540 | return false; |
88be7b4b | 541 | } |
cf3a74c9 DB |
542 | |
543 | iterbdrvs = iterbdrvs->next; | |
e9ff957a DL |
544 | } |
545 | ||
e26f98e2 | 546 | return true; |
e9ff957a | 547 | } |
9b00ea37 | 548 | |
cf3a74c9 DB |
549 | int bdrv_all_delete_snapshot(const char *name, |
550 | bool has_devices, strList *devices, | |
551 | Error **errp) | |
9b00ea37 | 552 | { |
cf3a74c9 DB |
553 | g_autoptr(GList) bdrvs = NULL; |
554 | GList *iterbdrvs; | |
555 | ||
6b573efe EGE |
556 | GLOBAL_STATE_CODE(); |
557 | ||
cf3a74c9 DB |
558 | if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { |
559 | return -1; | |
560 | } | |
9b00ea37 | 561 | |
cf3a74c9 DB |
562 | iterbdrvs = bdrvs; |
563 | while (iterbdrvs) { | |
564 | BlockDriverState *bs = iterbdrvs->data; | |
9b00ea37 | 565 | AioContext *ctx = bdrv_get_aio_context(bs); |
cf3a74c9 | 566 | QEMUSnapshotInfo sn1, *snapshot = &sn1; |
e26f98e2 | 567 | int ret = 0; |
9b00ea37 DL |
568 | |
569 | aio_context_acquire(ctx); | |
cf3a74c9 | 570 | if ((devices || bdrv_all_snapshots_includes_bs(bs)) && |
05f4aced KW |
571 | bdrv_snapshot_find(bs, snapshot, name) >= 0) |
572 | { | |
6ca08045 | 573 | ret = bdrv_snapshot_delete(bs, snapshot->id_str, |
e53a578a | 574 | snapshot->name, errp); |
9b00ea37 DL |
575 | } |
576 | aio_context_release(ctx); | |
88be7b4b | 577 | if (ret < 0) { |
e26f98e2 DB |
578 | error_prepend(errp, "Could not delete snapshot '%s' on '%s': ", |
579 | name, bdrv_get_device_or_node_name(bs)); | |
e26f98e2 | 580 | return -1; |
88be7b4b | 581 | } |
cf3a74c9 DB |
582 | |
583 | iterbdrvs = iterbdrvs->next; | |
9b00ea37 DL |
584 | } |
585 | ||
e26f98e2 | 586 | return 0; |
9b00ea37 | 587 | } |
4c1cdbaa DL |
588 | |
589 | ||
cf3a74c9 DB |
590 | int bdrv_all_goto_snapshot(const char *name, |
591 | bool has_devices, strList *devices, | |
592 | Error **errp) | |
4c1cdbaa | 593 | { |
cf3a74c9 DB |
594 | g_autoptr(GList) bdrvs = NULL; |
595 | GList *iterbdrvs; | |
4c1cdbaa | 596 | |
6b573efe EGE |
597 | GLOBAL_STATE_CODE(); |
598 | ||
cf3a74c9 DB |
599 | if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { |
600 | return -1; | |
601 | } | |
602 | ||
603 | iterbdrvs = bdrvs; | |
604 | while (iterbdrvs) { | |
605 | BlockDriverState *bs = iterbdrvs->data; | |
4c1cdbaa | 606 | AioContext *ctx = bdrv_get_aio_context(bs); |
e26f98e2 | 607 | int ret = 0; |
4c1cdbaa DL |
608 | |
609 | aio_context_acquire(ctx); | |
cf3a74c9 | 610 | if (devices || bdrv_all_snapshots_includes_bs(bs)) { |
2b624fe0 | 611 | ret = bdrv_snapshot_goto(bs, name, errp); |
4c1cdbaa DL |
612 | } |
613 | aio_context_release(ctx); | |
2b624fe0 | 614 | if (ret < 0) { |
e26f98e2 DB |
615 | error_prepend(errp, "Could not load snapshot '%s' on '%s': ", |
616 | name, bdrv_get_device_or_node_name(bs)); | |
e26f98e2 | 617 | return -1; |
88be7b4b | 618 | } |
cf3a74c9 DB |
619 | |
620 | iterbdrvs = iterbdrvs->next; | |
4c1cdbaa DL |
621 | } |
622 | ||
e26f98e2 | 623 | return 0; |
4c1cdbaa | 624 | } |
723ccda1 | 625 | |
3d3e9b1f DB |
626 | int bdrv_all_has_snapshot(const char *name, |
627 | bool has_devices, strList *devices, | |
628 | Error **errp) | |
723ccda1 | 629 | { |
cf3a74c9 DB |
630 | g_autoptr(GList) bdrvs = NULL; |
631 | GList *iterbdrvs; | |
632 | ||
6b573efe EGE |
633 | GLOBAL_STATE_CODE(); |
634 | ||
cf3a74c9 DB |
635 | if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { |
636 | return -1; | |
637 | } | |
723ccda1 | 638 | |
cf3a74c9 DB |
639 | iterbdrvs = bdrvs; |
640 | while (iterbdrvs) { | |
641 | BlockDriverState *bs = iterbdrvs->data; | |
723ccda1 | 642 | AioContext *ctx = bdrv_get_aio_context(bs); |
cf3a74c9 | 643 | QEMUSnapshotInfo sn; |
e26f98e2 | 644 | int ret = 0; |
723ccda1 DL |
645 | |
646 | aio_context_acquire(ctx); | |
cf3a74c9 | 647 | if (devices || bdrv_all_snapshots_includes_bs(bs)) { |
e26f98e2 | 648 | ret = bdrv_snapshot_find(bs, &sn, name); |
723ccda1 DL |
649 | } |
650 | aio_context_release(ctx); | |
e26f98e2 | 651 | if (ret < 0) { |
3d3e9b1f DB |
652 | if (ret == -ENOENT) { |
653 | return 0; | |
654 | } else { | |
655 | error_setg_errno(errp, errno, | |
656 | "Could not check snapshot '%s' on '%s'", | |
657 | name, bdrv_get_device_or_node_name(bs)); | |
658 | return -1; | |
659 | } | |
88be7b4b | 660 | } |
cf3a74c9 DB |
661 | |
662 | iterbdrvs = iterbdrvs->next; | |
723ccda1 DL |
663 | } |
664 | ||
3d3e9b1f | 665 | return 1; |
723ccda1 | 666 | } |
a9085f9b DL |
667 | |
668 | int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, | |
669 | BlockDriverState *vm_state_bs, | |
670 | uint64_t vm_state_size, | |
cf3a74c9 | 671 | bool has_devices, strList *devices, |
e26f98e2 | 672 | Error **errp) |
a9085f9b | 673 | { |
cf3a74c9 DB |
674 | g_autoptr(GList) bdrvs = NULL; |
675 | GList *iterbdrvs; | |
6b573efe | 676 | GLOBAL_STATE_CODE(); |
cf3a74c9 DB |
677 | |
678 | if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { | |
679 | return -1; | |
680 | } | |
a9085f9b | 681 | |
cf3a74c9 DB |
682 | iterbdrvs = bdrvs; |
683 | while (iterbdrvs) { | |
684 | BlockDriverState *bs = iterbdrvs->data; | |
a9085f9b | 685 | AioContext *ctx = bdrv_get_aio_context(bs); |
e26f98e2 | 686 | int ret = 0; |
a9085f9b DL |
687 | |
688 | aio_context_acquire(ctx); | |
689 | if (bs == vm_state_bs) { | |
690 | sn->vm_state_size = vm_state_size; | |
e26f98e2 | 691 | ret = bdrv_snapshot_create(bs, sn); |
cf3a74c9 | 692 | } else if (devices || bdrv_all_snapshots_includes_bs(bs)) { |
a9085f9b | 693 | sn->vm_state_size = 0; |
e26f98e2 | 694 | ret = bdrv_snapshot_create(bs, sn); |
a9085f9b DL |
695 | } |
696 | aio_context_release(ctx); | |
e26f98e2 DB |
697 | if (ret < 0) { |
698 | error_setg(errp, "Could not create snapshot '%s' on '%s'", | |
699 | sn->name, bdrv_get_device_or_node_name(bs)); | |
e26f98e2 | 700 | return -1; |
88be7b4b | 701 | } |
cf3a74c9 DB |
702 | |
703 | iterbdrvs = iterbdrvs->next; | |
a9085f9b DL |
704 | } |
705 | ||
e26f98e2 | 706 | return 0; |
a9085f9b | 707 | } |
7cb14481 | 708 | |
c22d644c DB |
709 | |
710 | BlockDriverState *bdrv_all_find_vmstate_bs(const char *vmstate_bs, | |
711 | bool has_devices, strList *devices, | |
cf3a74c9 | 712 | Error **errp) |
7cb14481 | 713 | { |
cf3a74c9 DB |
714 | g_autoptr(GList) bdrvs = NULL; |
715 | GList *iterbdrvs; | |
7cb14481 | 716 | |
6b573efe EGE |
717 | GLOBAL_STATE_CODE(); |
718 | ||
cf3a74c9 DB |
719 | if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { |
720 | return NULL; | |
721 | } | |
722 | ||
723 | iterbdrvs = bdrvs; | |
724 | while (iterbdrvs) { | |
725 | BlockDriverState *bs = iterbdrvs->data; | |
7cb14481 | 726 | AioContext *ctx = bdrv_get_aio_context(bs); |
cf3a74c9 | 727 | bool found = false; |
7cb14481 DL |
728 | |
729 | aio_context_acquire(ctx); | |
cf3a74c9 DB |
730 | found = (devices || bdrv_all_snapshots_includes_bs(bs)) && |
731 | bdrv_can_snapshot(bs); | |
7cb14481 | 732 | aio_context_release(ctx); |
88be7b4b | 733 | |
c22d644c DB |
734 | if (vmstate_bs) { |
735 | if (g_str_equal(vmstate_bs, | |
736 | bdrv_get_node_name(bs))) { | |
737 | if (found) { | |
738 | return bs; | |
739 | } else { | |
740 | error_setg(errp, | |
741 | "vmstate block device '%s' does not support snapshots", | |
742 | vmstate_bs); | |
743 | return NULL; | |
744 | } | |
745 | } | |
746 | } else if (found) { | |
cf3a74c9 | 747 | return bs; |
88be7b4b | 748 | } |
cf3a74c9 DB |
749 | |
750 | iterbdrvs = iterbdrvs->next; | |
7cb14481 | 751 | } |
cf3a74c9 | 752 | |
c22d644c DB |
753 | if (vmstate_bs) { |
754 | error_setg(errp, | |
755 | "vmstate block device '%s' does not exist", vmstate_bs); | |
756 | } else { | |
757 | error_setg(errp, | |
758 | "no block device can store vmstate for snapshot"); | |
759 | } | |
cf3a74c9 | 760 | return NULL; |
7cb14481 | 761 | } |