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25#include "qemu/osdep.h"
26#include "block/snapshot.h"
27#include "block/block_int.h"
28#include "qapi/error.h"
29#include "qapi/qmp/qerror.h"
30
31QemuOptsList internal_snapshot_opts = {
32 .name = "snapshot",
33 .head = QTAILQ_HEAD_INITIALIZER(internal_snapshot_opts.head),
34 .desc = {
35 {
36 .name = SNAPSHOT_OPT_ID,
37 .type = QEMU_OPT_STRING,
38 .help = "snapshot id"
39 },{
40 .name = SNAPSHOT_OPT_NAME,
41 .type = QEMU_OPT_STRING,
42 .help = "snapshot name"
43 },{
44
45 }
46 },
47};
48
49int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
50 const char *name)
51{
52 QEMUSnapshotInfo *sn_tab, *sn;
53 int nb_sns, i, ret;
54
55 ret = -ENOENT;
56 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
57 if (nb_sns < 0) {
58 return ret;
59 }
60 for (i = 0; i < nb_sns; i++) {
61 sn = &sn_tab[i];
62 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
63 *sn_info = *sn;
64 ret = 0;
65 break;
66 }
67 }
68 g_free(sn_tab);
69 return ret;
70}
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92bool bdrv_snapshot_find_by_id_and_name(BlockDriverState *bs,
93 const char *id,
94 const char *name,
95 QEMUSnapshotInfo *sn_info,
96 Error **errp)
97{
98 QEMUSnapshotInfo *sn_tab, *sn;
99 int nb_sns, i;
100 bool ret = false;
101
102 assert(id || name);
103
104 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
105 if (nb_sns < 0) {
106 error_setg_errno(errp, -nb_sns, "Failed to get a snapshot list");
107 return false;
108 } else if (nb_sns == 0) {
109 return false;
110 }
111
112 if (id && name) {
113 for (i = 0; i < nb_sns; i++) {
114 sn = &sn_tab[i];
115 if (!strcmp(sn->id_str, id) && !strcmp(sn->name, name)) {
116 *sn_info = *sn;
117 ret = true;
118 break;
119 }
120 }
121 } else if (id) {
122 for (i = 0; i < nb_sns; i++) {
123 sn = &sn_tab[i];
124 if (!strcmp(sn->id_str, id)) {
125 *sn_info = *sn;
126 ret = true;
127 break;
128 }
129 }
130 } else if (name) {
131 for (i = 0; i < nb_sns; i++) {
132 sn = &sn_tab[i];
133 if (!strcmp(sn->name, name)) {
134 *sn_info = *sn;
135 ret = true;
136 break;
137 }
138 }
139 }
140
141 g_free(sn_tab);
142 return ret;
143}
144
145int bdrv_can_snapshot(BlockDriverState *bs)
146{
147 BlockDriver *drv = bs->drv;
148 if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
149 return 0;
150 }
151
152 if (!drv->bdrv_snapshot_create) {
153 if (bs->file != NULL) {
154 return bdrv_can_snapshot(bs->file->bs);
155 }
156 return 0;
157 }
158
159 return 1;
160}
161
162int bdrv_snapshot_create(BlockDriverState *bs,
163 QEMUSnapshotInfo *sn_info)
164{
165 BlockDriver *drv = bs->drv;
166 if (!drv) {
167 return -ENOMEDIUM;
168 }
169 if (drv->bdrv_snapshot_create) {
170 return drv->bdrv_snapshot_create(bs, sn_info);
171 }
172 if (bs->file) {
173 return bdrv_snapshot_create(bs->file->bs, sn_info);
174 }
175 return -ENOTSUP;
176}
177
178int bdrv_snapshot_goto(BlockDriverState *bs,
179 const char *snapshot_id)
180{
181 BlockDriver *drv = bs->drv;
182 int ret, open_ret;
183
184 if (!drv) {
185 return -ENOMEDIUM;
186 }
187 if (drv->bdrv_snapshot_goto) {
188 return drv->bdrv_snapshot_goto(bs, snapshot_id);
189 }
190
191 if (bs->file) {
192 drv->bdrv_close(bs);
193 ret = bdrv_snapshot_goto(bs->file->bs, snapshot_id);
194 open_ret = drv->bdrv_open(bs, NULL, bs->open_flags, NULL);
195 if (open_ret < 0) {
196 bdrv_unref(bs->file->bs);
197 bs->drv = NULL;
198 return open_ret;
199 }
200 return ret;
201 }
202
203 return -ENOTSUP;
204}
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228int bdrv_snapshot_delete(BlockDriverState *bs,
229 const char *snapshot_id,
230 const char *name,
231 Error **errp)
232{
233 BlockDriver *drv = bs->drv;
234 int ret;
235
236 if (!drv) {
237 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs));
238 return -ENOMEDIUM;
239 }
240 if (!snapshot_id && !name) {
241 error_setg(errp, "snapshot_id and name are both NULL");
242 return -EINVAL;
243 }
244
245
246 bdrv_drained_begin(bs);
247
248 if (drv->bdrv_snapshot_delete) {
249 ret = drv->bdrv_snapshot_delete(bs, snapshot_id, name, errp);
250 } else if (bs->file) {
251 ret = bdrv_snapshot_delete(bs->file->bs, snapshot_id, name, errp);
252 } else {
253 error_setg(errp, "Block format '%s' used by device '%s' "
254 "does not support internal snapshot deletion",
255 drv->format_name, bdrv_get_device_name(bs));
256 ret = -ENOTSUP;
257 }
258
259 bdrv_drained_end(bs);
260 return ret;
261}
262
263int bdrv_snapshot_delete_by_id_or_name(BlockDriverState *bs,
264 const char *id_or_name,
265 Error **errp)
266{
267 int ret;
268 Error *local_err = NULL;
269
270 ret = bdrv_snapshot_delete(bs, id_or_name, NULL, &local_err);
271 if (ret == -ENOENT || ret == -EINVAL) {
272 error_free(local_err);
273 local_err = NULL;
274 ret = bdrv_snapshot_delete(bs, NULL, id_or_name, &local_err);
275 }
276
277 if (ret < 0) {
278 error_propagate(errp, local_err);
279 }
280 return ret;
281}
282
283int bdrv_snapshot_list(BlockDriverState *bs,
284 QEMUSnapshotInfo **psn_info)
285{
286 BlockDriver *drv = bs->drv;
287 if (!drv) {
288 return -ENOMEDIUM;
289 }
290 if (drv->bdrv_snapshot_list) {
291 return drv->bdrv_snapshot_list(bs, psn_info);
292 }
293 if (bs->file) {
294 return bdrv_snapshot_list(bs->file->bs, psn_info);
295 }
296 return -ENOTSUP;
297}
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319int bdrv_snapshot_load_tmp(BlockDriverState *bs,
320 const char *snapshot_id,
321 const char *name,
322 Error **errp)
323{
324 BlockDriver *drv = bs->drv;
325
326 if (!drv) {
327 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, bdrv_get_device_name(bs));
328 return -ENOMEDIUM;
329 }
330 if (!snapshot_id && !name) {
331 error_setg(errp, "snapshot_id and name are both NULL");
332 return -EINVAL;
333 }
334 if (!bs->read_only) {
335 error_setg(errp, "Device is not readonly");
336 return -EINVAL;
337 }
338 if (drv->bdrv_snapshot_load_tmp) {
339 return drv->bdrv_snapshot_load_tmp(bs, snapshot_id, name, errp);
340 }
341 error_setg(errp, "Block format '%s' used by device '%s' "
342 "does not support temporarily loading internal snapshots",
343 drv->format_name, bdrv_get_device_name(bs));
344 return -ENOTSUP;
345}
346
347int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs,
348 const char *id_or_name,
349 Error **errp)
350{
351 int ret;
352 Error *local_err = NULL;
353
354 ret = bdrv_snapshot_load_tmp(bs, id_or_name, NULL, &local_err);
355 if (ret == -ENOENT || ret == -EINVAL) {
356 error_free(local_err);
357 local_err = NULL;
358 ret = bdrv_snapshot_load_tmp(bs, NULL, id_or_name, &local_err);
359 }
360
361 if (local_err) {
362 error_propagate(errp, local_err);
363 }
364
365 return ret;
366}
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373bool bdrv_all_can_snapshot(BlockDriverState **first_bad_bs)
374{
375 bool ok = true;
376 BlockDriverState *bs = NULL;
377
378 while (ok && (bs = bdrv_next(bs))) {
379 AioContext *ctx = bdrv_get_aio_context(bs);
380
381 aio_context_acquire(ctx);
382 if (bdrv_is_inserted(bs) && !bdrv_is_read_only(bs)) {
383 ok = bdrv_can_snapshot(bs);
384 }
385 aio_context_release(ctx);
386 }
387
388 *first_bad_bs = bs;
389 return ok;
390}
391
392int bdrv_all_delete_snapshot(const char *name, BlockDriverState **first_bad_bs,
393 Error **err)
394{
395 int ret = 0;
396 BlockDriverState *bs = NULL;
397 QEMUSnapshotInfo sn1, *snapshot = &sn1;
398
399 while (ret == 0 && (bs = bdrv_next(bs))) {
400 AioContext *ctx = bdrv_get_aio_context(bs);
401
402 aio_context_acquire(ctx);
403 if (bdrv_can_snapshot(bs) &&
404 bdrv_snapshot_find(bs, snapshot, name) >= 0) {
405 ret = bdrv_snapshot_delete_by_id_or_name(bs, name, err);
406 }
407 aio_context_release(ctx);
408 }
409
410 *first_bad_bs = bs;
411 return ret;
412}
413
414
415int bdrv_all_goto_snapshot(const char *name, BlockDriverState **first_bad_bs)
416{
417 int err = 0;
418 BlockDriverState *bs = NULL;
419
420 while (err == 0 && (bs = bdrv_next(bs))) {
421 AioContext *ctx = bdrv_get_aio_context(bs);
422
423 aio_context_acquire(ctx);
424 if (bdrv_can_snapshot(bs)) {
425 err = bdrv_snapshot_goto(bs, name);
426 }
427 aio_context_release(ctx);
428 }
429
430 *first_bad_bs = bs;
431 return err;
432}
433
434int bdrv_all_find_snapshot(const char *name, BlockDriverState **first_bad_bs)
435{
436 QEMUSnapshotInfo sn;
437 int err = 0;
438 BlockDriverState *bs = NULL;
439
440 while (err == 0 && (bs = bdrv_next(bs))) {
441 AioContext *ctx = bdrv_get_aio_context(bs);
442
443 aio_context_acquire(ctx);
444 if (bdrv_can_snapshot(bs)) {
445 err = bdrv_snapshot_find(bs, &sn, name);
446 }
447 aio_context_release(ctx);
448 }
449
450 *first_bad_bs = bs;
451 return err;
452}
453
454int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
455 BlockDriverState *vm_state_bs,
456 uint64_t vm_state_size,
457 BlockDriverState **first_bad_bs)
458{
459 int err = 0;
460 BlockDriverState *bs = NULL;
461
462 while (err == 0 && (bs = bdrv_next(bs))) {
463 AioContext *ctx = bdrv_get_aio_context(bs);
464
465 aio_context_acquire(ctx);
466 if (bs == vm_state_bs) {
467 sn->vm_state_size = vm_state_size;
468 err = bdrv_snapshot_create(bs, sn);
469 } else if (bdrv_can_snapshot(bs)) {
470 sn->vm_state_size = 0;
471 err = bdrv_snapshot_create(bs, sn);
472 }
473 aio_context_release(ctx);
474 }
475
476 *first_bad_bs = bs;
477 return err;
478}
479
480BlockDriverState *bdrv_all_find_vmstate_bs(void)
481{
482 bool not_found = true;
483 BlockDriverState *bs = NULL;
484
485 while (not_found && (bs = bdrv_next(bs))) {
486 AioContext *ctx = bdrv_get_aio_context(bs);
487
488 aio_context_acquire(ctx);
489 not_found = !bdrv_can_snapshot(bs);
490 aio_context_release(ctx);
491 }
492 return bs;
493}
494