vfio: Change default dirty pages tracking behavior during migration
[qemu.git] / blockdev.c
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "qemu/osdep.h"
34 #include "sysemu/block-backend.h"
35 #include "sysemu/blockdev.h"
36 #include "hw/block/block.h"
37 #include "block/blockjob.h"
38 #include "block/qdict.h"
39 #include "block/throttle-groups.h"
40 #include "monitor/monitor.h"
41 #include "qemu/error-report.h"
42 #include "qemu/option.h"
43 #include "qemu/qemu-print.h"
44 #include "qemu/config-file.h"
45 #include "qapi/qapi-commands-block.h"
46 #include "qapi/qapi-commands-transaction.h"
47 #include "qapi/qapi-visit-block-core.h"
48 #include "qapi/qmp/qdict.h"
49 #include "qapi/qmp/qnum.h"
50 #include "qapi/qmp/qstring.h"
51 #include "qapi/error.h"
52 #include "qapi/qmp/qerror.h"
53 #include "qapi/qmp/qlist.h"
54 #include "qapi/qobject-output-visitor.h"
55 #include "sysemu/sysemu.h"
56 #include "sysemu/iothread.h"
57 #include "block/block_int.h"
58 #include "block/trace.h"
59 #include "sysemu/arch_init.h"
60 #include "sysemu/qtest.h"
61 #include "sysemu/runstate.h"
62 #include "sysemu/replay.h"
63 #include "qemu/cutils.h"
64 #include "qemu/help_option.h"
65 #include "qemu/main-loop.h"
66 #include "qemu/throttle-options.h"
67
68 QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
69 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
70
71 void bdrv_set_monitor_owned(BlockDriverState *bs)
72 {
73 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
74 }
75
76 static const char *const if_name[IF_COUNT] = {
77 [IF_NONE] = "none",
78 [IF_IDE] = "ide",
79 [IF_SCSI] = "scsi",
80 [IF_FLOPPY] = "floppy",
81 [IF_PFLASH] = "pflash",
82 [IF_MTD] = "mtd",
83 [IF_SD] = "sd",
84 [IF_VIRTIO] = "virtio",
85 [IF_XEN] = "xen",
86 };
87
88 static int if_max_devs[IF_COUNT] = {
89 /*
90 * Do not change these numbers! They govern how drive option
91 * index maps to unit and bus. That mapping is ABI.
92 *
93 * All controllers used to implement if=T drives need to support
94 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
95 * Otherwise, some index values map to "impossible" bus, unit
96 * values.
97 *
98 * For instance, if you change [IF_SCSI] to 255, -drive
99 * if=scsi,index=12 no longer means bus=1,unit=5, but
100 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
101 * the drive can't be set up. Regression.
102 */
103 [IF_IDE] = 2,
104 [IF_SCSI] = 7,
105 };
106
107 /**
108 * Boards may call this to offer board-by-board overrides
109 * of the default, global values.
110 */
111 void override_max_devs(BlockInterfaceType type, int max_devs)
112 {
113 BlockBackend *blk;
114 DriveInfo *dinfo;
115
116 if (max_devs <= 0) {
117 return;
118 }
119
120 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
121 dinfo = blk_legacy_dinfo(blk);
122 if (dinfo->type == type) {
123 fprintf(stderr, "Cannot override units-per-bus property of"
124 " the %s interface, because a drive of that type has"
125 " already been added.\n", if_name[type]);
126 g_assert_not_reached();
127 }
128 }
129
130 if_max_devs[type] = max_devs;
131 }
132
133 /*
134 * We automatically delete the drive when a device using it gets
135 * unplugged. Questionable feature, but we can't just drop it.
136 * Device models call blockdev_mark_auto_del() to schedule the
137 * automatic deletion, and generic qdev code calls blockdev_auto_del()
138 * when deletion is actually safe.
139 */
140 void blockdev_mark_auto_del(BlockBackend *blk)
141 {
142 DriveInfo *dinfo = blk_legacy_dinfo(blk);
143 BlockJob *job;
144
145 if (!dinfo) {
146 return;
147 }
148
149 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
150 if (block_job_has_bdrv(job, blk_bs(blk))) {
151 AioContext *aio_context = job->job.aio_context;
152 aio_context_acquire(aio_context);
153
154 job_cancel(&job->job, false);
155
156 aio_context_release(aio_context);
157 }
158 }
159
160 dinfo->auto_del = 1;
161 }
162
163 void blockdev_auto_del(BlockBackend *blk)
164 {
165 DriveInfo *dinfo = blk_legacy_dinfo(blk);
166
167 if (dinfo && dinfo->auto_del) {
168 monitor_remove_blk(blk);
169 blk_unref(blk);
170 }
171 }
172
173 /**
174 * Returns the current mapping of how many units per bus
175 * a particular interface can support.
176 *
177 * A positive integer indicates n units per bus.
178 * 0 implies the mapping has not been established.
179 * -1 indicates an invalid BlockInterfaceType was given.
180 */
181 int drive_get_max_devs(BlockInterfaceType type)
182 {
183 if (type >= IF_IDE && type < IF_COUNT) {
184 return if_max_devs[type];
185 }
186
187 return -1;
188 }
189
190 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
191 {
192 int max_devs = if_max_devs[type];
193 return max_devs ? index / max_devs : 0;
194 }
195
196 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
197 {
198 int max_devs = if_max_devs[type];
199 return max_devs ? index % max_devs : index;
200 }
201
202 QemuOpts *drive_def(const char *optstr)
203 {
204 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
205 }
206
207 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
208 const char *optstr)
209 {
210 QemuOpts *opts;
211
212 opts = drive_def(optstr);
213 if (!opts) {
214 return NULL;
215 }
216 if (type != IF_DEFAULT) {
217 qemu_opt_set(opts, "if", if_name[type], &error_abort);
218 }
219 if (index >= 0) {
220 qemu_opt_set_number(opts, "index", index, &error_abort);
221 }
222 if (file)
223 qemu_opt_set(opts, "file", file, &error_abort);
224 return opts;
225 }
226
227 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
228 {
229 BlockBackend *blk;
230 DriveInfo *dinfo;
231
232 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
233 dinfo = blk_legacy_dinfo(blk);
234 if (dinfo && dinfo->type == type
235 && dinfo->bus == bus && dinfo->unit == unit) {
236 return dinfo;
237 }
238 }
239
240 return NULL;
241 }
242
243 void drive_mark_claimed_by_board(void)
244 {
245 BlockBackend *blk;
246 DriveInfo *dinfo;
247
248 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
249 dinfo = blk_legacy_dinfo(blk);
250 if (dinfo && blk_get_attached_dev(blk)) {
251 dinfo->claimed_by_board = true;
252 }
253 }
254 }
255
256 void drive_check_orphaned(void)
257 {
258 BlockBackend *blk;
259 DriveInfo *dinfo;
260 Location loc;
261 bool orphans = false;
262
263 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
264 dinfo = blk_legacy_dinfo(blk);
265 if (dinfo->is_default || dinfo->type == IF_NONE) {
266 continue;
267 }
268 if (!blk_get_attached_dev(blk)) {
269 loc_push_none(&loc);
270 qemu_opts_loc_restore(dinfo->opts);
271 error_report("machine type does not support"
272 " if=%s,bus=%d,unit=%d",
273 if_name[dinfo->type], dinfo->bus, dinfo->unit);
274 loc_pop(&loc);
275 orphans = true;
276 continue;
277 }
278 if (!dinfo->claimed_by_board && dinfo->type != IF_VIRTIO) {
279 loc_push_none(&loc);
280 qemu_opts_loc_restore(dinfo->opts);
281 warn_report("bogus if=%s is deprecated, use if=none",
282 if_name[dinfo->type]);
283 loc_pop(&loc);
284 }
285 }
286
287 if (orphans) {
288 exit(1);
289 }
290 }
291
292 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
293 {
294 return drive_get(type,
295 drive_index_to_bus_id(type, index),
296 drive_index_to_unit_id(type, index));
297 }
298
299 int drive_get_max_bus(BlockInterfaceType type)
300 {
301 int max_bus;
302 BlockBackend *blk;
303 DriveInfo *dinfo;
304
305 max_bus = -1;
306 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
307 dinfo = blk_legacy_dinfo(blk);
308 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
309 max_bus = dinfo->bus;
310 }
311 }
312 return max_bus;
313 }
314
315 /* Get a block device. This should only be used for single-drive devices
316 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
317 appropriate bus. */
318 DriveInfo *drive_get_next(BlockInterfaceType type)
319 {
320 static int next_block_unit[IF_COUNT];
321
322 return drive_get(type, 0, next_block_unit[type]++);
323 }
324
325 static void bdrv_format_print(void *opaque, const char *name)
326 {
327 qemu_printf(" %s", name);
328 }
329
330 typedef struct {
331 QEMUBH *bh;
332 BlockDriverState *bs;
333 } BDRVPutRefBH;
334
335 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
336 {
337 if (!strcmp(buf, "ignore")) {
338 return BLOCKDEV_ON_ERROR_IGNORE;
339 } else if (!is_read && !strcmp(buf, "enospc")) {
340 return BLOCKDEV_ON_ERROR_ENOSPC;
341 } else if (!strcmp(buf, "stop")) {
342 return BLOCKDEV_ON_ERROR_STOP;
343 } else if (!strcmp(buf, "report")) {
344 return BLOCKDEV_ON_ERROR_REPORT;
345 } else {
346 error_setg(errp, "'%s' invalid %s error action",
347 buf, is_read ? "read" : "write");
348 return -1;
349 }
350 }
351
352 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
353 Error **errp)
354 {
355 const QListEntry *entry;
356 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
357 switch (qobject_type(entry->value)) {
358
359 case QTYPE_QSTRING: {
360 unsigned long long length;
361 const char *str = qstring_get_str(qobject_to(QString,
362 entry->value));
363 if (parse_uint_full(str, &length, 10) == 0 &&
364 length > 0 && length <= UINT_MAX) {
365 block_acct_add_interval(stats, (unsigned) length);
366 } else {
367 error_setg(errp, "Invalid interval length: %s", str);
368 return false;
369 }
370 break;
371 }
372
373 case QTYPE_QNUM: {
374 int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
375
376 if (length > 0 && length <= UINT_MAX) {
377 block_acct_add_interval(stats, (unsigned) length);
378 } else {
379 error_setg(errp, "Invalid interval length: %" PRId64, length);
380 return false;
381 }
382 break;
383 }
384
385 default:
386 error_setg(errp, "The specification of stats-intervals is invalid");
387 return false;
388 }
389 }
390 return true;
391 }
392
393 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
394
395 /* All parameters but @opts are optional and may be set to NULL. */
396 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
397 const char **throttling_group, ThrottleConfig *throttle_cfg,
398 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
399 {
400 Error *local_error = NULL;
401 const char *aio;
402
403 if (bdrv_flags) {
404 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
405 *bdrv_flags |= BDRV_O_COPY_ON_READ;
406 }
407
408 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
409 if (bdrv_parse_aio(aio, bdrv_flags) < 0) {
410 error_setg(errp, "invalid aio option");
411 return;
412 }
413 }
414 }
415
416 /* disk I/O throttling */
417 if (throttling_group) {
418 *throttling_group = qemu_opt_get(opts, "throttling.group");
419 }
420
421 if (throttle_cfg) {
422 throttle_config_init(throttle_cfg);
423 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
424 qemu_opt_get_number(opts, "throttling.bps-total", 0);
425 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
426 qemu_opt_get_number(opts, "throttling.bps-read", 0);
427 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
428 qemu_opt_get_number(opts, "throttling.bps-write", 0);
429 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
430 qemu_opt_get_number(opts, "throttling.iops-total", 0);
431 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
432 qemu_opt_get_number(opts, "throttling.iops-read", 0);
433 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
434 qemu_opt_get_number(opts, "throttling.iops-write", 0);
435
436 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
437 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
438 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
439 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
440 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
441 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
442 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
443 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
444 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
445 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
446 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
447 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
448
449 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
450 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
451 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
452 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
453 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
454 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
455 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
456 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
457 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
458 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
459 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
460 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
461
462 throttle_cfg->op_size =
463 qemu_opt_get_number(opts, "throttling.iops-size", 0);
464
465 if (!throttle_is_valid(throttle_cfg, errp)) {
466 return;
467 }
468 }
469
470 if (detect_zeroes) {
471 *detect_zeroes =
472 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
473 qemu_opt_get(opts, "detect-zeroes"),
474 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
475 &local_error);
476 if (local_error) {
477 error_propagate(errp, local_error);
478 return;
479 }
480 }
481 }
482
483 /* Takes the ownership of bs_opts */
484 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
485 Error **errp)
486 {
487 const char *buf;
488 int bdrv_flags = 0;
489 int on_read_error, on_write_error;
490 bool account_invalid, account_failed;
491 bool writethrough, read_only;
492 BlockBackend *blk;
493 BlockDriverState *bs;
494 ThrottleConfig cfg;
495 int snapshot = 0;
496 Error *error = NULL;
497 QemuOpts *opts;
498 QDict *interval_dict = NULL;
499 QList *interval_list = NULL;
500 const char *id;
501 BlockdevDetectZeroesOptions detect_zeroes =
502 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
503 const char *throttling_group = NULL;
504
505 /* Check common options by copying from bs_opts to opts, all other options
506 * stay in bs_opts for processing by bdrv_open(). */
507 id = qdict_get_try_str(bs_opts, "id");
508 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, errp);
509 if (!opts) {
510 goto err_no_opts;
511 }
512
513 if (!qemu_opts_absorb_qdict(opts, bs_opts, errp)) {
514 goto early_err;
515 }
516
517 if (id) {
518 qdict_del(bs_opts, "id");
519 }
520
521 /* extract parameters */
522 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
523
524 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
525 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
526
527 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
528
529 id = qemu_opts_id(opts);
530
531 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
532 qdict_array_split(interval_dict, &interval_list);
533
534 if (qdict_size(interval_dict) != 0) {
535 error_setg(errp, "Invalid option stats-intervals.%s",
536 qdict_first(interval_dict)->key);
537 goto early_err;
538 }
539
540 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
541 &detect_zeroes, &error);
542 if (error) {
543 error_propagate(errp, error);
544 goto early_err;
545 }
546
547 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
548 if (is_help_option(buf)) {
549 qemu_printf("Supported formats:");
550 bdrv_iterate_format(bdrv_format_print, NULL, false);
551 qemu_printf("\nSupported formats (read-only):");
552 bdrv_iterate_format(bdrv_format_print, NULL, true);
553 qemu_printf("\n");
554 goto early_err;
555 }
556
557 if (qdict_haskey(bs_opts, "driver")) {
558 error_setg(errp, "Cannot specify both 'driver' and 'format'");
559 goto early_err;
560 }
561 qdict_put_str(bs_opts, "driver", buf);
562 }
563
564 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
565 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
566 on_write_error = parse_block_error_action(buf, 0, &error);
567 if (error) {
568 error_propagate(errp, error);
569 goto early_err;
570 }
571 }
572
573 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
574 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
575 on_read_error = parse_block_error_action(buf, 1, &error);
576 if (error) {
577 error_propagate(errp, error);
578 goto early_err;
579 }
580 }
581
582 if (snapshot) {
583 bdrv_flags |= BDRV_O_SNAPSHOT;
584 }
585
586 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
587
588 /* init */
589 if ((!file || !*file) && !qdict_size(bs_opts)) {
590 BlockBackendRootState *blk_rs;
591
592 blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL);
593 blk_rs = blk_get_root_state(blk);
594 blk_rs->open_flags = bdrv_flags;
595 blk_rs->read_only = read_only;
596 blk_rs->detect_zeroes = detect_zeroes;
597
598 qobject_unref(bs_opts);
599 } else {
600 if (file && !*file) {
601 file = NULL;
602 }
603
604 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
605 * with other callers) rather than what we want as the real defaults.
606 * Apply the defaults here instead. */
607 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
608 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
609 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
610 read_only ? "on" : "off");
611 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on");
612 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
613
614 if (runstate_check(RUN_STATE_INMIGRATE)) {
615 bdrv_flags |= BDRV_O_INACTIVE;
616 }
617
618 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
619 if (!blk) {
620 goto err_no_bs_opts;
621 }
622 bs = blk_bs(blk);
623
624 bs->detect_zeroes = detect_zeroes;
625
626 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
627
628 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
629 blk_unref(blk);
630 blk = NULL;
631 goto err_no_bs_opts;
632 }
633 }
634
635 /* disk I/O throttling */
636 if (throttle_enabled(&cfg)) {
637 if (!throttling_group) {
638 throttling_group = id;
639 }
640 blk_io_limits_enable(blk, throttling_group);
641 blk_set_io_limits(blk, &cfg);
642 }
643
644 blk_set_enable_write_cache(blk, !writethrough);
645 blk_set_on_error(blk, on_read_error, on_write_error);
646
647 if (!monitor_add_blk(blk, id, errp)) {
648 blk_unref(blk);
649 blk = NULL;
650 goto err_no_bs_opts;
651 }
652
653 err_no_bs_opts:
654 qemu_opts_del(opts);
655 qobject_unref(interval_dict);
656 qobject_unref(interval_list);
657 return blk;
658
659 early_err:
660 qemu_opts_del(opts);
661 qobject_unref(interval_dict);
662 qobject_unref(interval_list);
663 err_no_opts:
664 qobject_unref(bs_opts);
665 return NULL;
666 }
667
668 /* Takes the ownership of bs_opts */
669 BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
670 {
671 int bdrv_flags = 0;
672
673 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
674 * with other callers) rather than what we want as the real defaults.
675 * Apply the defaults here instead. */
676 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
677 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
678 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
679
680 if (runstate_check(RUN_STATE_INMIGRATE)) {
681 bdrv_flags |= BDRV_O_INACTIVE;
682 }
683
684 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
685 }
686
687 void blockdev_close_all_bdrv_states(void)
688 {
689 BlockDriverState *bs, *next_bs;
690
691 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
692 AioContext *ctx = bdrv_get_aio_context(bs);
693
694 aio_context_acquire(ctx);
695 bdrv_unref(bs);
696 aio_context_release(ctx);
697 }
698 }
699
700 /* Iterates over the list of monitor-owned BlockDriverStates */
701 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
702 {
703 return bs ? QTAILQ_NEXT(bs, monitor_list)
704 : QTAILQ_FIRST(&monitor_bdrv_states);
705 }
706
707 static bool qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
708 Error **errp)
709 {
710 const char *value;
711
712 value = qemu_opt_get(opts, from);
713 if (value) {
714 if (qemu_opt_find(opts, to)) {
715 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
716 "same time", to, from);
717 return false;
718 }
719 }
720
721 /* rename all items in opts */
722 while ((value = qemu_opt_get(opts, from))) {
723 qemu_opt_set(opts, to, value, &error_abort);
724 qemu_opt_unset(opts, from);
725 }
726 return true;
727 }
728
729 QemuOptsList qemu_legacy_drive_opts = {
730 .name = "drive",
731 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
732 .desc = {
733 {
734 .name = "bus",
735 .type = QEMU_OPT_NUMBER,
736 .help = "bus number",
737 },{
738 .name = "unit",
739 .type = QEMU_OPT_NUMBER,
740 .help = "unit number (i.e. lun for scsi)",
741 },{
742 .name = "index",
743 .type = QEMU_OPT_NUMBER,
744 .help = "index number",
745 },{
746 .name = "media",
747 .type = QEMU_OPT_STRING,
748 .help = "media type (disk, cdrom)",
749 },{
750 .name = "if",
751 .type = QEMU_OPT_STRING,
752 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
753 },{
754 .name = "file",
755 .type = QEMU_OPT_STRING,
756 .help = "file name",
757 },
758
759 /* Options that are passed on, but have special semantics with -drive */
760 {
761 .name = BDRV_OPT_READ_ONLY,
762 .type = QEMU_OPT_BOOL,
763 .help = "open drive file as read-only",
764 },{
765 .name = "rerror",
766 .type = QEMU_OPT_STRING,
767 .help = "read error action",
768 },{
769 .name = "werror",
770 .type = QEMU_OPT_STRING,
771 .help = "write error action",
772 },{
773 .name = "copy-on-read",
774 .type = QEMU_OPT_BOOL,
775 .help = "copy read data from backing file into image file",
776 },
777
778 { /* end of list */ }
779 },
780 };
781
782 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type,
783 Error **errp)
784 {
785 const char *value;
786 BlockBackend *blk;
787 DriveInfo *dinfo = NULL;
788 QDict *bs_opts;
789 QemuOpts *legacy_opts;
790 DriveMediaType media = MEDIA_DISK;
791 BlockInterfaceType type;
792 int max_devs, bus_id, unit_id, index;
793 const char *werror, *rerror;
794 bool read_only = false;
795 bool copy_on_read;
796 const char *filename;
797 int i;
798
799 /* Change legacy command line options into QMP ones */
800 static const struct {
801 const char *from;
802 const char *to;
803 } opt_renames[] = {
804 { "iops", "throttling.iops-total" },
805 { "iops_rd", "throttling.iops-read" },
806 { "iops_wr", "throttling.iops-write" },
807
808 { "bps", "throttling.bps-total" },
809 { "bps_rd", "throttling.bps-read" },
810 { "bps_wr", "throttling.bps-write" },
811
812 { "iops_max", "throttling.iops-total-max" },
813 { "iops_rd_max", "throttling.iops-read-max" },
814 { "iops_wr_max", "throttling.iops-write-max" },
815
816 { "bps_max", "throttling.bps-total-max" },
817 { "bps_rd_max", "throttling.bps-read-max" },
818 { "bps_wr_max", "throttling.bps-write-max" },
819
820 { "iops_size", "throttling.iops-size" },
821
822 { "group", "throttling.group" },
823
824 { "readonly", BDRV_OPT_READ_ONLY },
825 };
826
827 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
828 if (!qemu_opt_rename(all_opts, opt_renames[i].from,
829 opt_renames[i].to, errp)) {
830 return NULL;
831 }
832 }
833
834 value = qemu_opt_get(all_opts, "cache");
835 if (value) {
836 int flags = 0;
837 bool writethrough;
838
839 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
840 error_setg(errp, "invalid cache option");
841 return NULL;
842 }
843
844 /* Specific options take precedence */
845 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
846 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
847 !writethrough, &error_abort);
848 }
849 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
850 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
851 !!(flags & BDRV_O_NOCACHE), &error_abort);
852 }
853 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
854 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
855 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
856 }
857 qemu_opt_unset(all_opts, "cache");
858 }
859
860 /* Get a QDict for processing the options */
861 bs_opts = qdict_new();
862 qemu_opts_to_qdict(all_opts, bs_opts);
863
864 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
865 &error_abort);
866 if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) {
867 goto fail;
868 }
869
870 /* Media type */
871 value = qemu_opt_get(legacy_opts, "media");
872 if (value) {
873 if (!strcmp(value, "disk")) {
874 media = MEDIA_DISK;
875 } else if (!strcmp(value, "cdrom")) {
876 media = MEDIA_CDROM;
877 read_only = true;
878 } else {
879 error_setg(errp, "'%s' invalid media", value);
880 goto fail;
881 }
882 }
883
884 /* copy-on-read is disabled with a warning for read-only devices */
885 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
886 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
887
888 if (read_only && copy_on_read) {
889 warn_report("disabling copy-on-read on read-only drive");
890 copy_on_read = false;
891 }
892
893 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
894 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
895
896 /* Controller type */
897 value = qemu_opt_get(legacy_opts, "if");
898 if (value) {
899 for (type = 0;
900 type < IF_COUNT && strcmp(value, if_name[type]);
901 type++) {
902 }
903 if (type == IF_COUNT) {
904 error_setg(errp, "unsupported bus type '%s'", value);
905 goto fail;
906 }
907 } else {
908 type = block_default_type;
909 }
910
911 /* Device address specified by bus/unit or index.
912 * If none was specified, try to find the first free one. */
913 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
914 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
915 index = qemu_opt_get_number(legacy_opts, "index", -1);
916
917 max_devs = if_max_devs[type];
918
919 if (index != -1) {
920 if (bus_id != 0 || unit_id != -1) {
921 error_setg(errp, "index cannot be used with bus and unit");
922 goto fail;
923 }
924 bus_id = drive_index_to_bus_id(type, index);
925 unit_id = drive_index_to_unit_id(type, index);
926 }
927
928 if (unit_id == -1) {
929 unit_id = 0;
930 while (drive_get(type, bus_id, unit_id) != NULL) {
931 unit_id++;
932 if (max_devs && unit_id >= max_devs) {
933 unit_id -= max_devs;
934 bus_id++;
935 }
936 }
937 }
938
939 if (max_devs && unit_id >= max_devs) {
940 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1);
941 goto fail;
942 }
943
944 if (drive_get(type, bus_id, unit_id) != NULL) {
945 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists",
946 bus_id, unit_id, index);
947 goto fail;
948 }
949
950 /* no id supplied -> create one */
951 if (qemu_opts_id(all_opts) == NULL) {
952 char *new_id;
953 const char *mediastr = "";
954 if (type == IF_IDE || type == IF_SCSI) {
955 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
956 }
957 if (max_devs) {
958 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
959 mediastr, unit_id);
960 } else {
961 new_id = g_strdup_printf("%s%s%i", if_name[type],
962 mediastr, unit_id);
963 }
964 qdict_put_str(bs_opts, "id", new_id);
965 g_free(new_id);
966 }
967
968 /* Add virtio block device */
969 if (type == IF_VIRTIO) {
970 QemuOpts *devopts;
971 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
972 &error_abort);
973 if (arch_type == QEMU_ARCH_S390X) {
974 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
975 } else {
976 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
977 }
978 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
979 &error_abort);
980 }
981
982 filename = qemu_opt_get(legacy_opts, "file");
983
984 /* Check werror/rerror compatibility with if=... */
985 werror = qemu_opt_get(legacy_opts, "werror");
986 if (werror != NULL) {
987 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
988 type != IF_NONE) {
989 error_setg(errp, "werror is not supported by this bus type");
990 goto fail;
991 }
992 qdict_put_str(bs_opts, "werror", werror);
993 }
994
995 rerror = qemu_opt_get(legacy_opts, "rerror");
996 if (rerror != NULL) {
997 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
998 type != IF_NONE) {
999 error_setg(errp, "rerror is not supported by this bus type");
1000 goto fail;
1001 }
1002 qdict_put_str(bs_opts, "rerror", rerror);
1003 }
1004
1005 /* Actual block device init: Functionality shared with blockdev-add */
1006 blk = blockdev_init(filename, bs_opts, errp);
1007 bs_opts = NULL;
1008 if (!blk) {
1009 goto fail;
1010 }
1011
1012 /* Create legacy DriveInfo */
1013 dinfo = g_malloc0(sizeof(*dinfo));
1014 dinfo->opts = all_opts;
1015
1016 dinfo->type = type;
1017 dinfo->bus = bus_id;
1018 dinfo->unit = unit_id;
1019
1020 blk_set_legacy_dinfo(blk, dinfo);
1021
1022 switch(type) {
1023 case IF_IDE:
1024 case IF_SCSI:
1025 case IF_XEN:
1026 case IF_NONE:
1027 dinfo->media_cd = media == MEDIA_CDROM;
1028 break;
1029 default:
1030 break;
1031 }
1032
1033 fail:
1034 qemu_opts_del(legacy_opts);
1035 qobject_unref(bs_opts);
1036 return dinfo;
1037 }
1038
1039 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1040 {
1041 BlockDriverState *bs;
1042
1043 bs = bdrv_lookup_bs(name, name, errp);
1044 if (bs == NULL) {
1045 return NULL;
1046 }
1047
1048 if (!bdrv_is_root_node(bs)) {
1049 error_setg(errp, "Need a root block node");
1050 return NULL;
1051 }
1052
1053 if (!bdrv_is_inserted(bs)) {
1054 error_setg(errp, "Device has no medium");
1055 return NULL;
1056 }
1057
1058 return bs;
1059 }
1060
1061 static void blockdev_do_action(TransactionAction *action, Error **errp)
1062 {
1063 TransactionActionList list;
1064
1065 list.value = action;
1066 list.next = NULL;
1067 qmp_transaction(&list, false, NULL, errp);
1068 }
1069
1070 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1071 bool has_node_name, const char *node_name,
1072 const char *snapshot_file,
1073 bool has_snapshot_node_name,
1074 const char *snapshot_node_name,
1075 bool has_format, const char *format,
1076 bool has_mode, NewImageMode mode, Error **errp)
1077 {
1078 BlockdevSnapshotSync snapshot = {
1079 .has_device = has_device,
1080 .device = (char *) device,
1081 .has_node_name = has_node_name,
1082 .node_name = (char *) node_name,
1083 .snapshot_file = (char *) snapshot_file,
1084 .has_snapshot_node_name = has_snapshot_node_name,
1085 .snapshot_node_name = (char *) snapshot_node_name,
1086 .has_format = has_format,
1087 .format = (char *) format,
1088 .has_mode = has_mode,
1089 .mode = mode,
1090 };
1091 TransactionAction action = {
1092 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1093 .u.blockdev_snapshot_sync.data = &snapshot,
1094 };
1095 blockdev_do_action(&action, errp);
1096 }
1097
1098 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1099 Error **errp)
1100 {
1101 BlockdevSnapshot snapshot_data = {
1102 .node = (char *) node,
1103 .overlay = (char *) overlay
1104 };
1105 TransactionAction action = {
1106 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1107 .u.blockdev_snapshot.data = &snapshot_data,
1108 };
1109 blockdev_do_action(&action, errp);
1110 }
1111
1112 void qmp_blockdev_snapshot_internal_sync(const char *device,
1113 const char *name,
1114 Error **errp)
1115 {
1116 BlockdevSnapshotInternal snapshot = {
1117 .device = (char *) device,
1118 .name = (char *) name
1119 };
1120 TransactionAction action = {
1121 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1122 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1123 };
1124 blockdev_do_action(&action, errp);
1125 }
1126
1127 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1128 bool has_id,
1129 const char *id,
1130 bool has_name,
1131 const char *name,
1132 Error **errp)
1133 {
1134 BlockDriverState *bs;
1135 AioContext *aio_context;
1136 QEMUSnapshotInfo sn;
1137 Error *local_err = NULL;
1138 SnapshotInfo *info = NULL;
1139 int ret;
1140
1141 bs = qmp_get_root_bs(device, errp);
1142 if (!bs) {
1143 return NULL;
1144 }
1145 aio_context = bdrv_get_aio_context(bs);
1146 aio_context_acquire(aio_context);
1147
1148 if (!has_id) {
1149 id = NULL;
1150 }
1151
1152 if (!has_name) {
1153 name = NULL;
1154 }
1155
1156 if (!id && !name) {
1157 error_setg(errp, "Name or id must be provided");
1158 goto out_aio_context;
1159 }
1160
1161 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1162 goto out_aio_context;
1163 }
1164
1165 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1166 if (local_err) {
1167 error_propagate(errp, local_err);
1168 goto out_aio_context;
1169 }
1170 if (!ret) {
1171 error_setg(errp,
1172 "Snapshot with id '%s' and name '%s' does not exist on "
1173 "device '%s'",
1174 STR_OR_NULL(id), STR_OR_NULL(name), device);
1175 goto out_aio_context;
1176 }
1177
1178 bdrv_snapshot_delete(bs, id, name, &local_err);
1179 if (local_err) {
1180 error_propagate(errp, local_err);
1181 goto out_aio_context;
1182 }
1183
1184 aio_context_release(aio_context);
1185
1186 info = g_new0(SnapshotInfo, 1);
1187 info->id = g_strdup(sn.id_str);
1188 info->name = g_strdup(sn.name);
1189 info->date_nsec = sn.date_nsec;
1190 info->date_sec = sn.date_sec;
1191 info->vm_state_size = sn.vm_state_size;
1192 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1193 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1194 if (sn.icount != -1ULL) {
1195 info->icount = sn.icount;
1196 info->has_icount = true;
1197 }
1198
1199 return info;
1200
1201 out_aio_context:
1202 aio_context_release(aio_context);
1203 return NULL;
1204 }
1205
1206 /* New and old BlockDriverState structs for atomic group operations */
1207
1208 typedef struct BlkActionState BlkActionState;
1209
1210 /**
1211 * BlkActionOps:
1212 * Table of operations that define an Action.
1213 *
1214 * @instance_size: Size of state struct, in bytes.
1215 * @prepare: Prepare the work, must NOT be NULL.
1216 * @commit: Commit the changes, can be NULL.
1217 * @abort: Abort the changes on fail, can be NULL.
1218 * @clean: Clean up resources after all transaction actions have called
1219 * commit() or abort(). Can be NULL.
1220 *
1221 * Only prepare() may fail. In a single transaction, only one of commit() or
1222 * abort() will be called. clean() will always be called if it is present.
1223 */
1224 typedef struct BlkActionOps {
1225 size_t instance_size;
1226 void (*prepare)(BlkActionState *common, Error **errp);
1227 void (*commit)(BlkActionState *common);
1228 void (*abort)(BlkActionState *common);
1229 void (*clean)(BlkActionState *common);
1230 } BlkActionOps;
1231
1232 /**
1233 * BlkActionState:
1234 * Describes one Action's state within a Transaction.
1235 *
1236 * @action: QAPI-defined enum identifying which Action to perform.
1237 * @ops: Table of ActionOps this Action can perform.
1238 * @block_job_txn: Transaction which this action belongs to.
1239 * @entry: List membership for all Actions in this Transaction.
1240 *
1241 * This structure must be arranged as first member in a subclassed type,
1242 * assuming that the compiler will also arrange it to the same offsets as the
1243 * base class.
1244 */
1245 struct BlkActionState {
1246 TransactionAction *action;
1247 const BlkActionOps *ops;
1248 JobTxn *block_job_txn;
1249 TransactionProperties *txn_props;
1250 QTAILQ_ENTRY(BlkActionState) entry;
1251 };
1252
1253 /* internal snapshot private data */
1254 typedef struct InternalSnapshotState {
1255 BlkActionState common;
1256 BlockDriverState *bs;
1257 QEMUSnapshotInfo sn;
1258 bool created;
1259 } InternalSnapshotState;
1260
1261
1262 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1263 {
1264 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1265 error_setg(errp,
1266 "Action '%s' does not support Transaction property "
1267 "completion-mode = %s",
1268 TransactionActionKind_str(s->action->type),
1269 ActionCompletionMode_str(s->txn_props->completion_mode));
1270 return -1;
1271 }
1272 return 0;
1273 }
1274
1275 static void internal_snapshot_prepare(BlkActionState *common,
1276 Error **errp)
1277 {
1278 Error *local_err = NULL;
1279 const char *device;
1280 const char *name;
1281 BlockDriverState *bs;
1282 QEMUSnapshotInfo old_sn, *sn;
1283 bool ret;
1284 qemu_timeval tv;
1285 BlockdevSnapshotInternal *internal;
1286 InternalSnapshotState *state;
1287 AioContext *aio_context;
1288 int ret1;
1289
1290 g_assert(common->action->type ==
1291 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1292 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1293 state = DO_UPCAST(InternalSnapshotState, common, common);
1294
1295 /* 1. parse input */
1296 device = internal->device;
1297 name = internal->name;
1298
1299 /* 2. check for validation */
1300 if (action_check_completion_mode(common, errp) < 0) {
1301 return;
1302 }
1303
1304 bs = qmp_get_root_bs(device, errp);
1305 if (!bs) {
1306 return;
1307 }
1308
1309 aio_context = bdrv_get_aio_context(bs);
1310 aio_context_acquire(aio_context);
1311
1312 state->bs = bs;
1313
1314 /* Paired with .clean() */
1315 bdrv_drained_begin(bs);
1316
1317 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1318 goto out;
1319 }
1320
1321 if (bdrv_is_read_only(bs)) {
1322 error_setg(errp, "Device '%s' is read only", device);
1323 goto out;
1324 }
1325
1326 if (!bdrv_can_snapshot(bs)) {
1327 error_setg(errp, "Block format '%s' used by device '%s' "
1328 "does not support internal snapshots",
1329 bs->drv->format_name, device);
1330 goto out;
1331 }
1332
1333 if (!strlen(name)) {
1334 error_setg(errp, "Name is empty");
1335 goto out;
1336 }
1337
1338 /* check whether a snapshot with name exist */
1339 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1340 &local_err);
1341 if (local_err) {
1342 error_propagate(errp, local_err);
1343 goto out;
1344 } else if (ret) {
1345 error_setg(errp,
1346 "Snapshot with name '%s' already exists on device '%s'",
1347 name, device);
1348 goto out;
1349 }
1350
1351 /* 3. take the snapshot */
1352 sn = &state->sn;
1353 pstrcpy(sn->name, sizeof(sn->name), name);
1354 qemu_gettimeofday(&tv);
1355 sn->date_sec = tv.tv_sec;
1356 sn->date_nsec = tv.tv_usec * 1000;
1357 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1358 if (replay_mode != REPLAY_MODE_NONE) {
1359 sn->icount = replay_get_current_icount();
1360 } else {
1361 sn->icount = -1ULL;
1362 }
1363
1364 ret1 = bdrv_snapshot_create(bs, sn);
1365 if (ret1 < 0) {
1366 error_setg_errno(errp, -ret1,
1367 "Failed to create snapshot '%s' on device '%s'",
1368 name, device);
1369 goto out;
1370 }
1371
1372 /* 4. succeed, mark a snapshot is created */
1373 state->created = true;
1374
1375 out:
1376 aio_context_release(aio_context);
1377 }
1378
1379 static void internal_snapshot_abort(BlkActionState *common)
1380 {
1381 InternalSnapshotState *state =
1382 DO_UPCAST(InternalSnapshotState, common, common);
1383 BlockDriverState *bs = state->bs;
1384 QEMUSnapshotInfo *sn = &state->sn;
1385 AioContext *aio_context;
1386 Error *local_error = NULL;
1387
1388 if (!state->created) {
1389 return;
1390 }
1391
1392 aio_context = bdrv_get_aio_context(state->bs);
1393 aio_context_acquire(aio_context);
1394
1395 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1396 error_reportf_err(local_error,
1397 "Failed to delete snapshot with id '%s' and "
1398 "name '%s' on device '%s' in abort: ",
1399 sn->id_str, sn->name,
1400 bdrv_get_device_name(bs));
1401 }
1402
1403 aio_context_release(aio_context);
1404 }
1405
1406 static void internal_snapshot_clean(BlkActionState *common)
1407 {
1408 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1409 common, common);
1410 AioContext *aio_context;
1411
1412 if (!state->bs) {
1413 return;
1414 }
1415
1416 aio_context = bdrv_get_aio_context(state->bs);
1417 aio_context_acquire(aio_context);
1418
1419 bdrv_drained_end(state->bs);
1420
1421 aio_context_release(aio_context);
1422 }
1423
1424 /* external snapshot private data */
1425 typedef struct ExternalSnapshotState {
1426 BlkActionState common;
1427 BlockDriverState *old_bs;
1428 BlockDriverState *new_bs;
1429 bool overlay_appended;
1430 } ExternalSnapshotState;
1431
1432 static void external_snapshot_prepare(BlkActionState *common,
1433 Error **errp)
1434 {
1435 int flags = 0;
1436 QDict *options = NULL;
1437 Error *local_err = NULL;
1438 /* Device and node name of the image to generate the snapshot from */
1439 const char *device;
1440 const char *node_name;
1441 /* Reference to the new image (for 'blockdev-snapshot') */
1442 const char *snapshot_ref;
1443 /* File name of the new image (for 'blockdev-snapshot-sync') */
1444 const char *new_image_file;
1445 ExternalSnapshotState *state =
1446 DO_UPCAST(ExternalSnapshotState, common, common);
1447 TransactionAction *action = common->action;
1448 AioContext *aio_context;
1449 uint64_t perm, shared;
1450
1451 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1452 * purpose but a different set of parameters */
1453 switch (action->type) {
1454 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1455 {
1456 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1457 device = s->node;
1458 node_name = s->node;
1459 new_image_file = NULL;
1460 snapshot_ref = s->overlay;
1461 }
1462 break;
1463 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1464 {
1465 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1466 device = s->has_device ? s->device : NULL;
1467 node_name = s->has_node_name ? s->node_name : NULL;
1468 new_image_file = s->snapshot_file;
1469 snapshot_ref = NULL;
1470 }
1471 break;
1472 default:
1473 g_assert_not_reached();
1474 }
1475
1476 /* start processing */
1477 if (action_check_completion_mode(common, errp) < 0) {
1478 return;
1479 }
1480
1481 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1482 if (!state->old_bs) {
1483 return;
1484 }
1485
1486 aio_context = bdrv_get_aio_context(state->old_bs);
1487 aio_context_acquire(aio_context);
1488
1489 /* Paired with .clean() */
1490 bdrv_drained_begin(state->old_bs);
1491
1492 if (!bdrv_is_inserted(state->old_bs)) {
1493 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1494 goto out;
1495 }
1496
1497 if (bdrv_op_is_blocked(state->old_bs,
1498 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1499 goto out;
1500 }
1501
1502 if (!bdrv_is_read_only(state->old_bs)) {
1503 if (bdrv_flush(state->old_bs)) {
1504 error_setg(errp, QERR_IO_ERROR);
1505 goto out;
1506 }
1507 }
1508
1509 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1510 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1511 const char *format = s->has_format ? s->format : "qcow2";
1512 enum NewImageMode mode;
1513 const char *snapshot_node_name =
1514 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1515
1516 if (node_name && !snapshot_node_name) {
1517 error_setg(errp, "New overlay node name missing");
1518 goto out;
1519 }
1520
1521 if (snapshot_node_name &&
1522 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1523 error_setg(errp, "New overlay node name already in use");
1524 goto out;
1525 }
1526
1527 flags = state->old_bs->open_flags;
1528 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1529 flags |= BDRV_O_NO_BACKING;
1530
1531 /* create new image w/backing file */
1532 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1533 if (mode != NEW_IMAGE_MODE_EXISTING) {
1534 int64_t size = bdrv_getlength(state->old_bs);
1535 if (size < 0) {
1536 error_setg_errno(errp, -size, "bdrv_getlength failed");
1537 goto out;
1538 }
1539 bdrv_refresh_filename(state->old_bs);
1540 bdrv_img_create(new_image_file, format,
1541 state->old_bs->filename,
1542 state->old_bs->drv->format_name,
1543 NULL, size, flags, false, &local_err);
1544 if (local_err) {
1545 error_propagate(errp, local_err);
1546 goto out;
1547 }
1548 }
1549
1550 options = qdict_new();
1551 if (snapshot_node_name) {
1552 qdict_put_str(options, "node-name", snapshot_node_name);
1553 }
1554 qdict_put_str(options, "driver", format);
1555 }
1556
1557 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1558 errp);
1559 /* We will manually add the backing_hd field to the bs later */
1560 if (!state->new_bs) {
1561 goto out;
1562 }
1563
1564 /*
1565 * Allow attaching a backing file to an overlay that's already in use only
1566 * if the parents don't assume that they are already seeing a valid image.
1567 * (Specifically, allow it as a mirror target, which is write-only access.)
1568 */
1569 bdrv_get_cumulative_perm(state->new_bs, &perm, &shared);
1570 if (perm & BLK_PERM_CONSISTENT_READ) {
1571 error_setg(errp, "The overlay is already in use");
1572 goto out;
1573 }
1574
1575 if (state->new_bs->drv->is_filter) {
1576 error_setg(errp, "Filters cannot be used as overlays");
1577 goto out;
1578 }
1579
1580 if (bdrv_cow_child(state->new_bs)) {
1581 error_setg(errp, "The overlay already has a backing image");
1582 goto out;
1583 }
1584
1585 if (!state->new_bs->drv->supports_backing) {
1586 error_setg(errp, "The overlay does not support backing images");
1587 goto out;
1588 }
1589
1590 /* This removes our old bs and adds the new bs. This is an operation that
1591 * can fail, so we need to do it in .prepare; undoing it for abort is
1592 * always possible. */
1593 bdrv_ref(state->new_bs);
1594 bdrv_append(state->new_bs, state->old_bs, &local_err);
1595 if (local_err) {
1596 error_propagate(errp, local_err);
1597 goto out;
1598 }
1599 state->overlay_appended = true;
1600
1601 out:
1602 aio_context_release(aio_context);
1603 }
1604
1605 static void external_snapshot_commit(BlkActionState *common)
1606 {
1607 ExternalSnapshotState *state =
1608 DO_UPCAST(ExternalSnapshotState, common, common);
1609 AioContext *aio_context;
1610
1611 aio_context = bdrv_get_aio_context(state->old_bs);
1612 aio_context_acquire(aio_context);
1613
1614 /* We don't need (or want) to use the transactional
1615 * bdrv_reopen_multiple() across all the entries at once, because we
1616 * don't want to abort all of them if one of them fails the reopen */
1617 if (!qatomic_read(&state->old_bs->copy_on_read)) {
1618 bdrv_reopen_set_read_only(state->old_bs, true, NULL);
1619 }
1620
1621 aio_context_release(aio_context);
1622 }
1623
1624 static void external_snapshot_abort(BlkActionState *common)
1625 {
1626 ExternalSnapshotState *state =
1627 DO_UPCAST(ExternalSnapshotState, common, common);
1628 if (state->new_bs) {
1629 if (state->overlay_appended) {
1630 AioContext *aio_context;
1631 AioContext *tmp_context;
1632 int ret;
1633
1634 aio_context = bdrv_get_aio_context(state->old_bs);
1635 aio_context_acquire(aio_context);
1636
1637 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1638 close state->old_bs; we need it */
1639 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1640
1641 /*
1642 * The call to bdrv_set_backing_hd() above returns state->old_bs to
1643 * the main AioContext. As we're still going to be using it, return
1644 * it to the AioContext it was before.
1645 */
1646 tmp_context = bdrv_get_aio_context(state->old_bs);
1647 if (aio_context != tmp_context) {
1648 aio_context_release(aio_context);
1649 aio_context_acquire(tmp_context);
1650
1651 ret = bdrv_try_set_aio_context(state->old_bs,
1652 aio_context, NULL);
1653 assert(ret == 0);
1654
1655 aio_context_release(tmp_context);
1656 aio_context_acquire(aio_context);
1657 }
1658
1659 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1660 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1661
1662 aio_context_release(aio_context);
1663 }
1664 }
1665 }
1666
1667 static void external_snapshot_clean(BlkActionState *common)
1668 {
1669 ExternalSnapshotState *state =
1670 DO_UPCAST(ExternalSnapshotState, common, common);
1671 AioContext *aio_context;
1672
1673 if (!state->old_bs) {
1674 return;
1675 }
1676
1677 aio_context = bdrv_get_aio_context(state->old_bs);
1678 aio_context_acquire(aio_context);
1679
1680 bdrv_drained_end(state->old_bs);
1681 bdrv_unref(state->new_bs);
1682
1683 aio_context_release(aio_context);
1684 }
1685
1686 typedef struct DriveBackupState {
1687 BlkActionState common;
1688 BlockDriverState *bs;
1689 BlockJob *job;
1690 } DriveBackupState;
1691
1692 static BlockJob *do_backup_common(BackupCommon *backup,
1693 BlockDriverState *bs,
1694 BlockDriverState *target_bs,
1695 AioContext *aio_context,
1696 JobTxn *txn, Error **errp);
1697
1698 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1699 {
1700 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1701 DriveBackup *backup;
1702 BlockDriverState *bs;
1703 BlockDriverState *target_bs;
1704 BlockDriverState *source = NULL;
1705 AioContext *aio_context;
1706 AioContext *old_context;
1707 QDict *options;
1708 Error *local_err = NULL;
1709 int flags;
1710 int64_t size;
1711 bool set_backing_hd = false;
1712 int ret;
1713
1714 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1715 backup = common->action->u.drive_backup.data;
1716
1717 if (!backup->has_mode) {
1718 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1719 }
1720
1721 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1722 if (!bs) {
1723 return;
1724 }
1725
1726 if (!bs->drv) {
1727 error_setg(errp, "Device has no medium");
1728 return;
1729 }
1730
1731 aio_context = bdrv_get_aio_context(bs);
1732 aio_context_acquire(aio_context);
1733
1734 /* Paired with .clean() */
1735 bdrv_drained_begin(bs);
1736
1737 if (!backup->has_format) {
1738 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
1739 NULL : (char *) bs->drv->format_name;
1740 }
1741
1742 /* Early check to avoid creating target */
1743 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
1744 goto out;
1745 }
1746
1747 flags = bs->open_flags | BDRV_O_RDWR;
1748
1749 /*
1750 * See if we have a backing HD we can use to create our new image
1751 * on top of.
1752 */
1753 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
1754 /*
1755 * Backup will not replace the source by the target, so none
1756 * of the filters skipped here will be removed (in contrast to
1757 * mirror). Therefore, we can skip all of them when looking
1758 * for the first COW relationship.
1759 */
1760 source = bdrv_cow_bs(bdrv_skip_filters(bs));
1761 if (!source) {
1762 backup->sync = MIRROR_SYNC_MODE_FULL;
1763 }
1764 }
1765 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
1766 source = bs;
1767 flags |= BDRV_O_NO_BACKING;
1768 set_backing_hd = true;
1769 }
1770
1771 size = bdrv_getlength(bs);
1772 if (size < 0) {
1773 error_setg_errno(errp, -size, "bdrv_getlength failed");
1774 goto out;
1775 }
1776
1777 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
1778 assert(backup->format);
1779 if (source) {
1780 /* Implicit filters should not appear in the filename */
1781 BlockDriverState *explicit_backing =
1782 bdrv_skip_implicit_filters(source);
1783
1784 bdrv_refresh_filename(explicit_backing);
1785 bdrv_img_create(backup->target, backup->format,
1786 explicit_backing->filename,
1787 explicit_backing->drv->format_name, NULL,
1788 size, flags, false, &local_err);
1789 } else {
1790 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
1791 size, flags, false, &local_err);
1792 }
1793 }
1794
1795 if (local_err) {
1796 error_propagate(errp, local_err);
1797 goto out;
1798 }
1799
1800 options = qdict_new();
1801 qdict_put_str(options, "discard", "unmap");
1802 qdict_put_str(options, "detect-zeroes", "unmap");
1803 if (backup->format) {
1804 qdict_put_str(options, "driver", backup->format);
1805 }
1806
1807 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
1808 if (!target_bs) {
1809 goto out;
1810 }
1811
1812 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
1813 old_context = bdrv_get_aio_context(target_bs);
1814 aio_context_release(aio_context);
1815 aio_context_acquire(old_context);
1816
1817 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
1818 if (ret < 0) {
1819 bdrv_unref(target_bs);
1820 aio_context_release(old_context);
1821 return;
1822 }
1823
1824 aio_context_release(old_context);
1825 aio_context_acquire(aio_context);
1826
1827 if (set_backing_hd) {
1828 bdrv_set_backing_hd(target_bs, source, &local_err);
1829 if (local_err) {
1830 goto unref;
1831 }
1832 }
1833
1834 state->bs = bs;
1835
1836 state->job = do_backup_common(qapi_DriveBackup_base(backup),
1837 bs, target_bs, aio_context,
1838 common->block_job_txn, errp);
1839
1840 unref:
1841 bdrv_unref(target_bs);
1842 out:
1843 aio_context_release(aio_context);
1844 }
1845
1846 static void drive_backup_commit(BlkActionState *common)
1847 {
1848 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1849 AioContext *aio_context;
1850
1851 aio_context = bdrv_get_aio_context(state->bs);
1852 aio_context_acquire(aio_context);
1853
1854 assert(state->job);
1855 job_start(&state->job->job);
1856
1857 aio_context_release(aio_context);
1858 }
1859
1860 static void drive_backup_abort(BlkActionState *common)
1861 {
1862 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1863
1864 if (state->job) {
1865 AioContext *aio_context;
1866
1867 aio_context = bdrv_get_aio_context(state->bs);
1868 aio_context_acquire(aio_context);
1869
1870 job_cancel_sync(&state->job->job);
1871
1872 aio_context_release(aio_context);
1873 }
1874 }
1875
1876 static void drive_backup_clean(BlkActionState *common)
1877 {
1878 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1879 AioContext *aio_context;
1880
1881 if (!state->bs) {
1882 return;
1883 }
1884
1885 aio_context = bdrv_get_aio_context(state->bs);
1886 aio_context_acquire(aio_context);
1887
1888 bdrv_drained_end(state->bs);
1889
1890 aio_context_release(aio_context);
1891 }
1892
1893 typedef struct BlockdevBackupState {
1894 BlkActionState common;
1895 BlockDriverState *bs;
1896 BlockJob *job;
1897 } BlockdevBackupState;
1898
1899 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1900 {
1901 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1902 BlockdevBackup *backup;
1903 BlockDriverState *bs;
1904 BlockDriverState *target_bs;
1905 AioContext *aio_context;
1906 AioContext *old_context;
1907 int ret;
1908
1909 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1910 backup = common->action->u.blockdev_backup.data;
1911
1912 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1913 if (!bs) {
1914 return;
1915 }
1916
1917 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
1918 if (!target_bs) {
1919 return;
1920 }
1921
1922 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
1923 aio_context = bdrv_get_aio_context(bs);
1924 old_context = bdrv_get_aio_context(target_bs);
1925 aio_context_acquire(old_context);
1926
1927 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
1928 if (ret < 0) {
1929 aio_context_release(old_context);
1930 return;
1931 }
1932
1933 aio_context_release(old_context);
1934 aio_context_acquire(aio_context);
1935 state->bs = bs;
1936
1937 /* Paired with .clean() */
1938 bdrv_drained_begin(state->bs);
1939
1940 state->job = do_backup_common(qapi_BlockdevBackup_base(backup),
1941 bs, target_bs, aio_context,
1942 common->block_job_txn, errp);
1943
1944 aio_context_release(aio_context);
1945 }
1946
1947 static void blockdev_backup_commit(BlkActionState *common)
1948 {
1949 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1950 AioContext *aio_context;
1951
1952 aio_context = bdrv_get_aio_context(state->bs);
1953 aio_context_acquire(aio_context);
1954
1955 assert(state->job);
1956 job_start(&state->job->job);
1957
1958 aio_context_release(aio_context);
1959 }
1960
1961 static void blockdev_backup_abort(BlkActionState *common)
1962 {
1963 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1964
1965 if (state->job) {
1966 AioContext *aio_context;
1967
1968 aio_context = bdrv_get_aio_context(state->bs);
1969 aio_context_acquire(aio_context);
1970
1971 job_cancel_sync(&state->job->job);
1972
1973 aio_context_release(aio_context);
1974 }
1975 }
1976
1977 static void blockdev_backup_clean(BlkActionState *common)
1978 {
1979 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1980 AioContext *aio_context;
1981
1982 if (!state->bs) {
1983 return;
1984 }
1985
1986 aio_context = bdrv_get_aio_context(state->bs);
1987 aio_context_acquire(aio_context);
1988
1989 bdrv_drained_end(state->bs);
1990
1991 aio_context_release(aio_context);
1992 }
1993
1994 typedef struct BlockDirtyBitmapState {
1995 BlkActionState common;
1996 BdrvDirtyBitmap *bitmap;
1997 BlockDriverState *bs;
1998 HBitmap *backup;
1999 bool prepared;
2000 bool was_enabled;
2001 } BlockDirtyBitmapState;
2002
2003 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
2004 Error **errp)
2005 {
2006 Error *local_err = NULL;
2007 BlockDirtyBitmapAdd *action;
2008 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2009 common, common);
2010
2011 if (action_check_completion_mode(common, errp) < 0) {
2012 return;
2013 }
2014
2015 action = common->action->u.block_dirty_bitmap_add.data;
2016 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2017 qmp_block_dirty_bitmap_add(action->node, action->name,
2018 action->has_granularity, action->granularity,
2019 action->has_persistent, action->persistent,
2020 action->has_disabled, action->disabled,
2021 &local_err);
2022
2023 if (!local_err) {
2024 state->prepared = true;
2025 } else {
2026 error_propagate(errp, local_err);
2027 }
2028 }
2029
2030 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2031 {
2032 BlockDirtyBitmapAdd *action;
2033 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2034 common, common);
2035
2036 action = common->action->u.block_dirty_bitmap_add.data;
2037 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2038 * then the node reference and bitmap name must have been valid.
2039 */
2040 if (state->prepared) {
2041 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2042 }
2043 }
2044
2045 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2046 Error **errp)
2047 {
2048 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2049 common, common);
2050 BlockDirtyBitmap *action;
2051
2052 if (action_check_completion_mode(common, errp) < 0) {
2053 return;
2054 }
2055
2056 action = common->action->u.block_dirty_bitmap_clear.data;
2057 state->bitmap = block_dirty_bitmap_lookup(action->node,
2058 action->name,
2059 &state->bs,
2060 errp);
2061 if (!state->bitmap) {
2062 return;
2063 }
2064
2065 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) {
2066 return;
2067 }
2068
2069 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2070 }
2071
2072 static void block_dirty_bitmap_restore(BlkActionState *common)
2073 {
2074 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2075 common, common);
2076
2077 if (state->backup) {
2078 bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
2079 }
2080 }
2081
2082 static void block_dirty_bitmap_free_backup(BlkActionState *common)
2083 {
2084 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2085 common, common);
2086
2087 hbitmap_free(state->backup);
2088 }
2089
2090 static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
2091 Error **errp)
2092 {
2093 BlockDirtyBitmap *action;
2094 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2095 common, common);
2096
2097 if (action_check_completion_mode(common, errp) < 0) {
2098 return;
2099 }
2100
2101 action = common->action->u.block_dirty_bitmap_enable.data;
2102 state->bitmap = block_dirty_bitmap_lookup(action->node,
2103 action->name,
2104 NULL,
2105 errp);
2106 if (!state->bitmap) {
2107 return;
2108 }
2109
2110 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2111 return;
2112 }
2113
2114 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2115 bdrv_enable_dirty_bitmap(state->bitmap);
2116 }
2117
2118 static void block_dirty_bitmap_enable_abort(BlkActionState *common)
2119 {
2120 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2121 common, common);
2122
2123 if (!state->was_enabled) {
2124 bdrv_disable_dirty_bitmap(state->bitmap);
2125 }
2126 }
2127
2128 static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
2129 Error **errp)
2130 {
2131 BlockDirtyBitmap *action;
2132 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2133 common, common);
2134
2135 if (action_check_completion_mode(common, errp) < 0) {
2136 return;
2137 }
2138
2139 action = common->action->u.block_dirty_bitmap_disable.data;
2140 state->bitmap = block_dirty_bitmap_lookup(action->node,
2141 action->name,
2142 NULL,
2143 errp);
2144 if (!state->bitmap) {
2145 return;
2146 }
2147
2148 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2149 return;
2150 }
2151
2152 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2153 bdrv_disable_dirty_bitmap(state->bitmap);
2154 }
2155
2156 static void block_dirty_bitmap_disable_abort(BlkActionState *common)
2157 {
2158 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2159 common, common);
2160
2161 if (state->was_enabled) {
2162 bdrv_enable_dirty_bitmap(state->bitmap);
2163 }
2164 }
2165
2166 static void block_dirty_bitmap_merge_prepare(BlkActionState *common,
2167 Error **errp)
2168 {
2169 BlockDirtyBitmapMerge *action;
2170 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2171 common, common);
2172
2173 if (action_check_completion_mode(common, errp) < 0) {
2174 return;
2175 }
2176
2177 action = common->action->u.block_dirty_bitmap_merge.data;
2178
2179 state->bitmap = block_dirty_bitmap_merge(action->node, action->target,
2180 action->bitmaps, &state->backup,
2181 errp);
2182 }
2183
2184 static void block_dirty_bitmap_remove_prepare(BlkActionState *common,
2185 Error **errp)
2186 {
2187 BlockDirtyBitmap *action;
2188 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2189 common, common);
2190
2191 if (action_check_completion_mode(common, errp) < 0) {
2192 return;
2193 }
2194
2195 action = common->action->u.block_dirty_bitmap_remove.data;
2196
2197 state->bitmap = block_dirty_bitmap_remove(action->node, action->name,
2198 false, &state->bs, errp);
2199 if (state->bitmap) {
2200 bdrv_dirty_bitmap_skip_store(state->bitmap, true);
2201 bdrv_dirty_bitmap_set_busy(state->bitmap, true);
2202 }
2203 }
2204
2205 static void block_dirty_bitmap_remove_abort(BlkActionState *common)
2206 {
2207 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2208 common, common);
2209
2210 if (state->bitmap) {
2211 bdrv_dirty_bitmap_skip_store(state->bitmap, false);
2212 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2213 }
2214 }
2215
2216 static void block_dirty_bitmap_remove_commit(BlkActionState *common)
2217 {
2218 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2219 common, common);
2220
2221 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2222 bdrv_release_dirty_bitmap(state->bitmap);
2223 }
2224
2225 static void abort_prepare(BlkActionState *common, Error **errp)
2226 {
2227 error_setg(errp, "Transaction aborted using Abort action");
2228 }
2229
2230 static void abort_commit(BlkActionState *common)
2231 {
2232 g_assert_not_reached(); /* this action never succeeds */
2233 }
2234
2235 static const BlkActionOps actions[] = {
2236 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2237 .instance_size = sizeof(ExternalSnapshotState),
2238 .prepare = external_snapshot_prepare,
2239 .commit = external_snapshot_commit,
2240 .abort = external_snapshot_abort,
2241 .clean = external_snapshot_clean,
2242 },
2243 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2244 .instance_size = sizeof(ExternalSnapshotState),
2245 .prepare = external_snapshot_prepare,
2246 .commit = external_snapshot_commit,
2247 .abort = external_snapshot_abort,
2248 .clean = external_snapshot_clean,
2249 },
2250 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2251 .instance_size = sizeof(DriveBackupState),
2252 .prepare = drive_backup_prepare,
2253 .commit = drive_backup_commit,
2254 .abort = drive_backup_abort,
2255 .clean = drive_backup_clean,
2256 },
2257 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2258 .instance_size = sizeof(BlockdevBackupState),
2259 .prepare = blockdev_backup_prepare,
2260 .commit = blockdev_backup_commit,
2261 .abort = blockdev_backup_abort,
2262 .clean = blockdev_backup_clean,
2263 },
2264 [TRANSACTION_ACTION_KIND_ABORT] = {
2265 .instance_size = sizeof(BlkActionState),
2266 .prepare = abort_prepare,
2267 .commit = abort_commit,
2268 },
2269 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2270 .instance_size = sizeof(InternalSnapshotState),
2271 .prepare = internal_snapshot_prepare,
2272 .abort = internal_snapshot_abort,
2273 .clean = internal_snapshot_clean,
2274 },
2275 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2276 .instance_size = sizeof(BlockDirtyBitmapState),
2277 .prepare = block_dirty_bitmap_add_prepare,
2278 .abort = block_dirty_bitmap_add_abort,
2279 },
2280 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2281 .instance_size = sizeof(BlockDirtyBitmapState),
2282 .prepare = block_dirty_bitmap_clear_prepare,
2283 .commit = block_dirty_bitmap_free_backup,
2284 .abort = block_dirty_bitmap_restore,
2285 },
2286 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = {
2287 .instance_size = sizeof(BlockDirtyBitmapState),
2288 .prepare = block_dirty_bitmap_enable_prepare,
2289 .abort = block_dirty_bitmap_enable_abort,
2290 },
2291 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = {
2292 .instance_size = sizeof(BlockDirtyBitmapState),
2293 .prepare = block_dirty_bitmap_disable_prepare,
2294 .abort = block_dirty_bitmap_disable_abort,
2295 },
2296 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = {
2297 .instance_size = sizeof(BlockDirtyBitmapState),
2298 .prepare = block_dirty_bitmap_merge_prepare,
2299 .commit = block_dirty_bitmap_free_backup,
2300 .abort = block_dirty_bitmap_restore,
2301 },
2302 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE] = {
2303 .instance_size = sizeof(BlockDirtyBitmapState),
2304 .prepare = block_dirty_bitmap_remove_prepare,
2305 .commit = block_dirty_bitmap_remove_commit,
2306 .abort = block_dirty_bitmap_remove_abort,
2307 },
2308 /* Where are transactions for MIRROR, COMMIT and STREAM?
2309 * Although these blockjobs use transaction callbacks like the backup job,
2310 * these jobs do not necessarily adhere to transaction semantics.
2311 * These jobs may not fully undo all of their actions on abort, nor do they
2312 * necessarily work in transactions with more than one job in them.
2313 */
2314 };
2315
2316 /**
2317 * Allocate a TransactionProperties structure if necessary, and fill
2318 * that structure with desired defaults if they are unset.
2319 */
2320 static TransactionProperties *get_transaction_properties(
2321 TransactionProperties *props)
2322 {
2323 if (!props) {
2324 props = g_new0(TransactionProperties, 1);
2325 }
2326
2327 if (!props->has_completion_mode) {
2328 props->has_completion_mode = true;
2329 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2330 }
2331
2332 return props;
2333 }
2334
2335 /*
2336 * 'Atomic' group operations. The operations are performed as a set, and if
2337 * any fail then we roll back all operations in the group.
2338 */
2339 void qmp_transaction(TransactionActionList *dev_list,
2340 bool has_props,
2341 struct TransactionProperties *props,
2342 Error **errp)
2343 {
2344 TransactionActionList *dev_entry = dev_list;
2345 JobTxn *block_job_txn = NULL;
2346 BlkActionState *state, *next;
2347 Error *local_err = NULL;
2348
2349 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states;
2350 QTAILQ_INIT(&snap_bdrv_states);
2351
2352 /* Does this transaction get canceled as a group on failure?
2353 * If not, we don't really need to make a JobTxn.
2354 */
2355 props = get_transaction_properties(props);
2356 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2357 block_job_txn = job_txn_new();
2358 }
2359
2360 /* drain all i/o before any operations */
2361 bdrv_drain_all();
2362
2363 /* We don't do anything in this loop that commits us to the operations */
2364 while (NULL != dev_entry) {
2365 TransactionAction *dev_info = NULL;
2366 const BlkActionOps *ops;
2367
2368 dev_info = dev_entry->value;
2369 dev_entry = dev_entry->next;
2370
2371 assert(dev_info->type < ARRAY_SIZE(actions));
2372
2373 ops = &actions[dev_info->type];
2374 assert(ops->instance_size > 0);
2375
2376 state = g_malloc0(ops->instance_size);
2377 state->ops = ops;
2378 state->action = dev_info;
2379 state->block_job_txn = block_job_txn;
2380 state->txn_props = props;
2381 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2382
2383 state->ops->prepare(state, &local_err);
2384 if (local_err) {
2385 error_propagate(errp, local_err);
2386 goto delete_and_fail;
2387 }
2388 }
2389
2390 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) {
2391 if (state->ops->commit) {
2392 state->ops->commit(state);
2393 }
2394 }
2395
2396 /* success */
2397 goto exit;
2398
2399 delete_and_fail:
2400 /* failure, and it is all-or-none; roll back all operations */
2401 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) {
2402 if (state->ops->abort) {
2403 state->ops->abort(state);
2404 }
2405 }
2406 exit:
2407 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2408 if (state->ops->clean) {
2409 state->ops->clean(state);
2410 }
2411 g_free(state);
2412 }
2413 if (!has_props) {
2414 qapi_free_TransactionProperties(props);
2415 }
2416 job_txn_unref(block_job_txn);
2417 }
2418
2419 void qmp_block_passwd(bool has_device, const char *device,
2420 bool has_node_name, const char *node_name,
2421 const char *password, Error **errp)
2422 {
2423 error_setg(errp,
2424 "Setting block passwords directly is no longer supported");
2425 }
2426
2427 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2428 const char *name,
2429 Error **errp)
2430 {
2431 BdrvDirtyBitmap *bitmap;
2432 BlockDriverState *bs;
2433 BlockDirtyBitmapSha256 *ret = NULL;
2434 char *sha256;
2435
2436 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2437 if (!bitmap || !bs) {
2438 return NULL;
2439 }
2440
2441 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2442 if (sha256 == NULL) {
2443 return NULL;
2444 }
2445
2446 ret = g_new(BlockDirtyBitmapSha256, 1);
2447 ret->sha256 = sha256;
2448
2449 return ret;
2450 }
2451
2452 void coroutine_fn qmp_block_resize(bool has_device, const char *device,
2453 bool has_node_name, const char *node_name,
2454 int64_t size, Error **errp)
2455 {
2456 Error *local_err = NULL;
2457 BlockBackend *blk = NULL;
2458 BlockDriverState *bs;
2459 AioContext *old_ctx;
2460
2461 bs = bdrv_lookup_bs(has_device ? device : NULL,
2462 has_node_name ? node_name : NULL,
2463 &local_err);
2464 if (local_err) {
2465 error_propagate(errp, local_err);
2466 return;
2467 }
2468
2469 if (size < 0) {
2470 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2471 goto out;
2472 }
2473
2474 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2475 error_setg(errp, QERR_DEVICE_IN_USE, device);
2476 goto out;
2477 }
2478
2479 blk = blk_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp);
2480 if (!blk) {
2481 goto out;
2482 }
2483
2484 bdrv_drained_begin(bs);
2485 old_ctx = bdrv_co_enter(bs);
2486 blk_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp);
2487 bdrv_co_leave(bs, old_ctx);
2488 bdrv_drained_end(bs);
2489
2490 out:
2491 bdrv_co_lock(bs);
2492 blk_unref(blk);
2493 bdrv_co_unlock(bs);
2494 }
2495
2496 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
2497 bool has_base, const char *base,
2498 bool has_base_node, const char *base_node,
2499 bool has_backing_file, const char *backing_file,
2500 bool has_speed, int64_t speed,
2501 bool has_on_error, BlockdevOnError on_error,
2502 bool has_auto_finalize, bool auto_finalize,
2503 bool has_auto_dismiss, bool auto_dismiss,
2504 Error **errp)
2505 {
2506 BlockDriverState *bs, *iter;
2507 BlockDriverState *base_bs = NULL;
2508 AioContext *aio_context;
2509 Error *local_err = NULL;
2510 const char *base_name = NULL;
2511 int job_flags = JOB_DEFAULT;
2512
2513 if (!has_on_error) {
2514 on_error = BLOCKDEV_ON_ERROR_REPORT;
2515 }
2516
2517 bs = bdrv_lookup_bs(device, device, errp);
2518 if (!bs) {
2519 return;
2520 }
2521
2522 aio_context = bdrv_get_aio_context(bs);
2523 aio_context_acquire(aio_context);
2524
2525 if (has_base && has_base_node) {
2526 error_setg(errp, "'base' and 'base-node' cannot be specified "
2527 "at the same time");
2528 goto out;
2529 }
2530
2531 if (has_base) {
2532 base_bs = bdrv_find_backing_image(bs, base);
2533 if (base_bs == NULL) {
2534 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2535 goto out;
2536 }
2537 assert(bdrv_get_aio_context(base_bs) == aio_context);
2538 base_name = base;
2539 }
2540
2541 if (has_base_node) {
2542 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2543 if (!base_bs) {
2544 goto out;
2545 }
2546 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
2547 error_setg(errp, "Node '%s' is not a backing image of '%s'",
2548 base_node, device);
2549 goto out;
2550 }
2551 assert(bdrv_get_aio_context(base_bs) == aio_context);
2552 bdrv_refresh_filename(base_bs);
2553 base_name = base_bs->filename;
2554 }
2555
2556 /* Check for op blockers in the whole chain between bs and base */
2557 for (iter = bs; iter && iter != base_bs;
2558 iter = bdrv_filter_or_cow_bs(iter))
2559 {
2560 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
2561 goto out;
2562 }
2563 }
2564
2565 /* if we are streaming the entire chain, the result will have no backing
2566 * file, and specifying one is therefore an error */
2567 if (base_bs == NULL && has_backing_file) {
2568 error_setg(errp, "backing file specified, but streaming the "
2569 "entire chain");
2570 goto out;
2571 }
2572
2573 /* backing_file string overrides base bs filename */
2574 base_name = has_backing_file ? backing_file : base_name;
2575
2576 if (has_auto_finalize && !auto_finalize) {
2577 job_flags |= JOB_MANUAL_FINALIZE;
2578 }
2579 if (has_auto_dismiss && !auto_dismiss) {
2580 job_flags |= JOB_MANUAL_DISMISS;
2581 }
2582
2583 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
2584 job_flags, has_speed ? speed : 0, on_error, &local_err);
2585 if (local_err) {
2586 error_propagate(errp, local_err);
2587 goto out;
2588 }
2589
2590 trace_qmp_block_stream(bs);
2591
2592 out:
2593 aio_context_release(aio_context);
2594 }
2595
2596 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
2597 bool has_base_node, const char *base_node,
2598 bool has_base, const char *base,
2599 bool has_top_node, const char *top_node,
2600 bool has_top, const char *top,
2601 bool has_backing_file, const char *backing_file,
2602 bool has_speed, int64_t speed,
2603 bool has_on_error, BlockdevOnError on_error,
2604 bool has_filter_node_name, const char *filter_node_name,
2605 bool has_auto_finalize, bool auto_finalize,
2606 bool has_auto_dismiss, bool auto_dismiss,
2607 Error **errp)
2608 {
2609 BlockDriverState *bs;
2610 BlockDriverState *iter;
2611 BlockDriverState *base_bs, *top_bs;
2612 AioContext *aio_context;
2613 Error *local_err = NULL;
2614 int job_flags = JOB_DEFAULT;
2615 uint64_t top_perm, top_shared;
2616
2617 if (!has_speed) {
2618 speed = 0;
2619 }
2620 if (!has_on_error) {
2621 on_error = BLOCKDEV_ON_ERROR_REPORT;
2622 }
2623 if (!has_filter_node_name) {
2624 filter_node_name = NULL;
2625 }
2626 if (has_auto_finalize && !auto_finalize) {
2627 job_flags |= JOB_MANUAL_FINALIZE;
2628 }
2629 if (has_auto_dismiss && !auto_dismiss) {
2630 job_flags |= JOB_MANUAL_DISMISS;
2631 }
2632
2633 /* Important Note:
2634 * libvirt relies on the DeviceNotFound error class in order to probe for
2635 * live commit feature versions; for this to work, we must make sure to
2636 * perform the device lookup before any generic errors that may occur in a
2637 * scenario in which all optional arguments are omitted. */
2638 bs = qmp_get_root_bs(device, &local_err);
2639 if (!bs) {
2640 bs = bdrv_lookup_bs(device, device, NULL);
2641 if (!bs) {
2642 error_free(local_err);
2643 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2644 "Device '%s' not found", device);
2645 } else {
2646 error_propagate(errp, local_err);
2647 }
2648 return;
2649 }
2650
2651 aio_context = bdrv_get_aio_context(bs);
2652 aio_context_acquire(aio_context);
2653
2654 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2655 goto out;
2656 }
2657
2658 /* default top_bs is the active layer */
2659 top_bs = bs;
2660
2661 if (has_top_node && has_top) {
2662 error_setg(errp, "'top-node' and 'top' are mutually exclusive");
2663 goto out;
2664 } else if (has_top_node) {
2665 top_bs = bdrv_lookup_bs(NULL, top_node, errp);
2666 if (top_bs == NULL) {
2667 goto out;
2668 }
2669 if (!bdrv_chain_contains(bs, top_bs)) {
2670 error_setg(errp, "'%s' is not in this backing file chain",
2671 top_node);
2672 goto out;
2673 }
2674 } else if (has_top && top) {
2675 /* This strcmp() is just a shortcut, there is no need to
2676 * refresh @bs's filename. If it mismatches,
2677 * bdrv_find_backing_image() will do the refresh and may still
2678 * return @bs. */
2679 if (strcmp(bs->filename, top) != 0) {
2680 top_bs = bdrv_find_backing_image(bs, top);
2681 }
2682 }
2683
2684 if (top_bs == NULL) {
2685 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2686 goto out;
2687 }
2688
2689 assert(bdrv_get_aio_context(top_bs) == aio_context);
2690
2691 if (has_base_node && has_base) {
2692 error_setg(errp, "'base-node' and 'base' are mutually exclusive");
2693 goto out;
2694 } else if (has_base_node) {
2695 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2696 if (base_bs == NULL) {
2697 goto out;
2698 }
2699 if (!bdrv_chain_contains(top_bs, base_bs)) {
2700 error_setg(errp, "'%s' is not in this backing file chain",
2701 base_node);
2702 goto out;
2703 }
2704 } else if (has_base && base) {
2705 base_bs = bdrv_find_backing_image(top_bs, base);
2706 } else {
2707 base_bs = bdrv_find_base(top_bs);
2708 }
2709
2710 if (base_bs == NULL) {
2711 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2712 goto out;
2713 }
2714
2715 assert(bdrv_get_aio_context(base_bs) == aio_context);
2716
2717 for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs);
2718 iter = bdrv_filter_or_cow_bs(iter))
2719 {
2720 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2721 goto out;
2722 }
2723 }
2724
2725 /* Do not allow attempts to commit an image into itself */
2726 if (top_bs == base_bs) {
2727 error_setg(errp, "cannot commit an image into itself");
2728 goto out;
2729 }
2730
2731 /*
2732 * Active commit is required if and only if someone has taken a
2733 * WRITE permission on the top node. Historically, we have always
2734 * used active commit for top nodes, so continue that practice
2735 * lest we possibly break clients that rely on this behavior, e.g.
2736 * to later attach this node to a writing parent.
2737 * (Active commit is never really wrong.)
2738 */
2739 bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared);
2740 if (top_perm & BLK_PERM_WRITE ||
2741 bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs))
2742 {
2743 if (has_backing_file) {
2744 if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) {
2745 error_setg(errp, "'backing-file' specified,"
2746 " but 'top' is the active layer");
2747 } else {
2748 error_setg(errp, "'backing-file' specified, but 'top' has a "
2749 "writer on it");
2750 }
2751 goto out;
2752 }
2753 if (!has_job_id) {
2754 /*
2755 * Emulate here what block_job_create() does, because it
2756 * is possible that @bs != @top_bs (the block job should
2757 * be named after @bs, even if @top_bs is the actual
2758 * source)
2759 */
2760 job_id = bdrv_get_device_name(bs);
2761 }
2762 commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error,
2763 filter_node_name, NULL, NULL, false, &local_err);
2764 } else {
2765 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
2766 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2767 goto out;
2768 }
2769 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags,
2770 speed, on_error, has_backing_file ? backing_file : NULL,
2771 filter_node_name, &local_err);
2772 }
2773 if (local_err != NULL) {
2774 error_propagate(errp, local_err);
2775 goto out;
2776 }
2777
2778 out:
2779 aio_context_release(aio_context);
2780 }
2781
2782 /* Common QMP interface for drive-backup and blockdev-backup */
2783 static BlockJob *do_backup_common(BackupCommon *backup,
2784 BlockDriverState *bs,
2785 BlockDriverState *target_bs,
2786 AioContext *aio_context,
2787 JobTxn *txn, Error **errp)
2788 {
2789 BlockJob *job = NULL;
2790 BdrvDirtyBitmap *bmap = NULL;
2791 int job_flags = JOB_DEFAULT;
2792
2793 if (!backup->has_speed) {
2794 backup->speed = 0;
2795 }
2796 if (!backup->has_on_source_error) {
2797 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2798 }
2799 if (!backup->has_on_target_error) {
2800 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2801 }
2802 if (!backup->has_job_id) {
2803 backup->job_id = NULL;
2804 }
2805 if (!backup->has_auto_finalize) {
2806 backup->auto_finalize = true;
2807 }
2808 if (!backup->has_auto_dismiss) {
2809 backup->auto_dismiss = true;
2810 }
2811 if (!backup->has_compress) {
2812 backup->compress = false;
2813 }
2814
2815 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) ||
2816 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) {
2817 /* done before desugaring 'incremental' to print the right message */
2818 if (!backup->has_bitmap) {
2819 error_setg(errp, "must provide a valid bitmap name for "
2820 "'%s' sync mode", MirrorSyncMode_str(backup->sync));
2821 return NULL;
2822 }
2823 }
2824
2825 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) {
2826 if (backup->has_bitmap_mode &&
2827 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) {
2828 error_setg(errp, "Bitmap sync mode must be '%s' "
2829 "when using sync mode '%s'",
2830 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS),
2831 MirrorSyncMode_str(backup->sync));
2832 return NULL;
2833 }
2834 backup->has_bitmap_mode = true;
2835 backup->sync = MIRROR_SYNC_MODE_BITMAP;
2836 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS;
2837 }
2838
2839 if (backup->has_bitmap) {
2840 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
2841 if (!bmap) {
2842 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
2843 return NULL;
2844 }
2845 if (!backup->has_bitmap_mode) {
2846 error_setg(errp, "Bitmap sync mode must be given "
2847 "when providing a bitmap");
2848 return NULL;
2849 }
2850 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2851 return NULL;
2852 }
2853
2854 /* This does not produce a useful bitmap artifact: */
2855 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
2856 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap"
2857 " outputs", MirrorSyncMode_str(backup->sync));
2858 return NULL;
2859 }
2860
2861 /* If the bitmap isn't used for input or output, this is useless: */
2862 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER &&
2863 backup->sync != MIRROR_SYNC_MODE_BITMAP) {
2864 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect"
2865 " when combined with sync mode '%s'",
2866 BitmapSyncMode_str(backup->bitmap_mode),
2867 MirrorSyncMode_str(backup->sync));
2868 return NULL;
2869 }
2870 }
2871
2872 if (!backup->has_bitmap && backup->has_bitmap_mode) {
2873 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap");
2874 return NULL;
2875 }
2876
2877 if (!backup->auto_finalize) {
2878 job_flags |= JOB_MANUAL_FINALIZE;
2879 }
2880 if (!backup->auto_dismiss) {
2881 job_flags |= JOB_MANUAL_DISMISS;
2882 }
2883
2884 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
2885 backup->sync, bmap, backup->bitmap_mode,
2886 backup->compress,
2887 backup->filter_node_name,
2888 backup->on_source_error,
2889 backup->on_target_error,
2890 job_flags, NULL, NULL, txn, errp);
2891 return job;
2892 }
2893
2894 void qmp_drive_backup(DriveBackup *backup, Error **errp)
2895 {
2896 TransactionAction action = {
2897 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP,
2898 .u.drive_backup.data = backup,
2899 };
2900 blockdev_do_action(&action, errp);
2901 }
2902
2903 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat,
2904 bool flat,
2905 Error **errp)
2906 {
2907 bool return_flat = has_flat && flat;
2908
2909 return bdrv_named_nodes_list(return_flat, errp);
2910 }
2911
2912 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
2913 {
2914 return bdrv_get_xdbg_block_graph(errp);
2915 }
2916
2917 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp)
2918 {
2919 TransactionAction action = {
2920 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP,
2921 .u.blockdev_backup.data = backup,
2922 };
2923 blockdev_do_action(&action, errp);
2924 }
2925
2926 /* Parameter check and block job starting for drive mirroring.
2927 * Caller should hold @device and @target's aio context (must be the same).
2928 **/
2929 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
2930 BlockDriverState *target,
2931 bool has_replaces, const char *replaces,
2932 enum MirrorSyncMode sync,
2933 BlockMirrorBackingMode backing_mode,
2934 bool zero_target,
2935 bool has_speed, int64_t speed,
2936 bool has_granularity, uint32_t granularity,
2937 bool has_buf_size, int64_t buf_size,
2938 bool has_on_source_error,
2939 BlockdevOnError on_source_error,
2940 bool has_on_target_error,
2941 BlockdevOnError on_target_error,
2942 bool has_unmap, bool unmap,
2943 bool has_filter_node_name,
2944 const char *filter_node_name,
2945 bool has_copy_mode, MirrorCopyMode copy_mode,
2946 bool has_auto_finalize, bool auto_finalize,
2947 bool has_auto_dismiss, bool auto_dismiss,
2948 Error **errp)
2949 {
2950 BlockDriverState *unfiltered_bs;
2951 int job_flags = JOB_DEFAULT;
2952
2953 if (!has_speed) {
2954 speed = 0;
2955 }
2956 if (!has_on_source_error) {
2957 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2958 }
2959 if (!has_on_target_error) {
2960 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2961 }
2962 if (!has_granularity) {
2963 granularity = 0;
2964 }
2965 if (!has_buf_size) {
2966 buf_size = 0;
2967 }
2968 if (!has_unmap) {
2969 unmap = true;
2970 }
2971 if (!has_filter_node_name) {
2972 filter_node_name = NULL;
2973 }
2974 if (!has_copy_mode) {
2975 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
2976 }
2977 if (has_auto_finalize && !auto_finalize) {
2978 job_flags |= JOB_MANUAL_FINALIZE;
2979 }
2980 if (has_auto_dismiss && !auto_dismiss) {
2981 job_flags |= JOB_MANUAL_DISMISS;
2982 }
2983
2984 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2985 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2986 "a value in range [512B, 64MB]");
2987 return;
2988 }
2989 if (granularity & (granularity - 1)) {
2990 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2991 "power of 2");
2992 return;
2993 }
2994
2995 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
2996 return;
2997 }
2998 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
2999 return;
3000 }
3001
3002 if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) {
3003 sync = MIRROR_SYNC_MODE_FULL;
3004 }
3005
3006 if (!has_replaces) {
3007 /* We want to mirror from @bs, but keep implicit filters on top */
3008 unfiltered_bs = bdrv_skip_implicit_filters(bs);
3009 if (unfiltered_bs != bs) {
3010 replaces = unfiltered_bs->node_name;
3011 has_replaces = true;
3012 }
3013 }
3014
3015 if (has_replaces) {
3016 BlockDriverState *to_replace_bs;
3017 AioContext *replace_aio_context;
3018 int64_t bs_size, replace_size;
3019
3020 bs_size = bdrv_getlength(bs);
3021 if (bs_size < 0) {
3022 error_setg_errno(errp, -bs_size, "Failed to query device's size");
3023 return;
3024 }
3025
3026 to_replace_bs = check_to_replace_node(bs, replaces, errp);
3027 if (!to_replace_bs) {
3028 return;
3029 }
3030
3031 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3032 aio_context_acquire(replace_aio_context);
3033 replace_size = bdrv_getlength(to_replace_bs);
3034 aio_context_release(replace_aio_context);
3035
3036 if (replace_size < 0) {
3037 error_setg_errno(errp, -replace_size,
3038 "Failed to query the replacement node's size");
3039 return;
3040 }
3041 if (bs_size != replace_size) {
3042 error_setg(errp, "cannot replace image with a mirror image of "
3043 "different size");
3044 return;
3045 }
3046 }
3047
3048 /* pass the node name to replace to mirror start since it's loose coupling
3049 * and will allow to check whether the node still exist at mirror completion
3050 */
3051 mirror_start(job_id, bs, target,
3052 has_replaces ? replaces : NULL, job_flags,
3053 speed, granularity, buf_size, sync, backing_mode, zero_target,
3054 on_source_error, on_target_error, unmap, filter_node_name,
3055 copy_mode, errp);
3056 }
3057
3058 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3059 {
3060 BlockDriverState *bs;
3061 BlockDriverState *target_backing_bs, *target_bs;
3062 AioContext *aio_context;
3063 AioContext *old_context;
3064 BlockMirrorBackingMode backing_mode;
3065 Error *local_err = NULL;
3066 QDict *options = NULL;
3067 int flags;
3068 int64_t size;
3069 const char *format = arg->format;
3070 bool zero_target;
3071 int ret;
3072
3073 bs = qmp_get_root_bs(arg->device, errp);
3074 if (!bs) {
3075 return;
3076 }
3077
3078 /* Early check to avoid creating target */
3079 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3080 return;
3081 }
3082
3083 aio_context = bdrv_get_aio_context(bs);
3084 aio_context_acquire(aio_context);
3085
3086 if (!arg->has_mode) {
3087 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3088 }
3089
3090 if (!arg->has_format) {
3091 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3092 ? NULL : bs->drv->format_name);
3093 }
3094
3095 flags = bs->open_flags | BDRV_O_RDWR;
3096 target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs));
3097 if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) {
3098 arg->sync = MIRROR_SYNC_MODE_FULL;
3099 }
3100 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3101 target_backing_bs = bs;
3102 }
3103
3104 size = bdrv_getlength(bs);
3105 if (size < 0) {
3106 error_setg_errno(errp, -size, "bdrv_getlength failed");
3107 goto out;
3108 }
3109
3110 if (arg->has_replaces) {
3111 if (!arg->has_node_name) {
3112 error_setg(errp, "a node-name must be provided when replacing a"
3113 " named node of the graph");
3114 goto out;
3115 }
3116 }
3117
3118 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3119 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3120 } else {
3121 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3122 }
3123
3124 /* Don't open backing image in create() */
3125 flags |= BDRV_O_NO_BACKING;
3126
3127 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs)
3128 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3129 {
3130 /* create new image w/o backing file */
3131 assert(format);
3132 bdrv_img_create(arg->target, format,
3133 NULL, NULL, NULL, size, flags, false, &local_err);
3134 } else {
3135 /* Implicit filters should not appear in the filename */
3136 BlockDriverState *explicit_backing =
3137 bdrv_skip_implicit_filters(target_backing_bs);
3138
3139 switch (arg->mode) {
3140 case NEW_IMAGE_MODE_EXISTING:
3141 break;
3142 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3143 /* create new image with backing file */
3144 bdrv_refresh_filename(explicit_backing);
3145 bdrv_img_create(arg->target, format,
3146 explicit_backing->filename,
3147 explicit_backing->drv->format_name,
3148 NULL, size, flags, false, &local_err);
3149 break;
3150 default:
3151 abort();
3152 }
3153 }
3154
3155 if (local_err) {
3156 error_propagate(errp, local_err);
3157 goto out;
3158 }
3159
3160 options = qdict_new();
3161 if (arg->has_node_name) {
3162 qdict_put_str(options, "node-name", arg->node_name);
3163 }
3164 if (format) {
3165 qdict_put_str(options, "driver", format);
3166 }
3167
3168 /* Mirroring takes care of copy-on-write using the source's backing
3169 * file.
3170 */
3171 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3172 if (!target_bs) {
3173 goto out;
3174 }
3175
3176 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL &&
3177 (arg->mode == NEW_IMAGE_MODE_EXISTING ||
3178 !bdrv_has_zero_init(target_bs)));
3179
3180
3181 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
3182 old_context = bdrv_get_aio_context(target_bs);
3183 aio_context_release(aio_context);
3184 aio_context_acquire(old_context);
3185
3186 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
3187 if (ret < 0) {
3188 bdrv_unref(target_bs);
3189 aio_context_release(old_context);
3190 return;
3191 }
3192
3193 aio_context_release(old_context);
3194 aio_context_acquire(aio_context);
3195
3196 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
3197 arg->has_replaces, arg->replaces, arg->sync,
3198 backing_mode, zero_target,
3199 arg->has_speed, arg->speed,
3200 arg->has_granularity, arg->granularity,
3201 arg->has_buf_size, arg->buf_size,
3202 arg->has_on_source_error, arg->on_source_error,
3203 arg->has_on_target_error, arg->on_target_error,
3204 arg->has_unmap, arg->unmap,
3205 false, NULL,
3206 arg->has_copy_mode, arg->copy_mode,
3207 arg->has_auto_finalize, arg->auto_finalize,
3208 arg->has_auto_dismiss, arg->auto_dismiss,
3209 errp);
3210 bdrv_unref(target_bs);
3211 out:
3212 aio_context_release(aio_context);
3213 }
3214
3215 void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
3216 const char *device, const char *target,
3217 bool has_replaces, const char *replaces,
3218 MirrorSyncMode sync,
3219 bool has_speed, int64_t speed,
3220 bool has_granularity, uint32_t granularity,
3221 bool has_buf_size, int64_t buf_size,
3222 bool has_on_source_error,
3223 BlockdevOnError on_source_error,
3224 bool has_on_target_error,
3225 BlockdevOnError on_target_error,
3226 bool has_filter_node_name,
3227 const char *filter_node_name,
3228 bool has_copy_mode, MirrorCopyMode copy_mode,
3229 bool has_auto_finalize, bool auto_finalize,
3230 bool has_auto_dismiss, bool auto_dismiss,
3231 Error **errp)
3232 {
3233 BlockDriverState *bs;
3234 BlockDriverState *target_bs;
3235 AioContext *aio_context;
3236 AioContext *old_context;
3237 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3238 bool zero_target;
3239 int ret;
3240
3241 bs = qmp_get_root_bs(device, errp);
3242 if (!bs) {
3243 return;
3244 }
3245
3246 target_bs = bdrv_lookup_bs(target, target, errp);
3247 if (!target_bs) {
3248 return;
3249 }
3250
3251 zero_target = (sync == MIRROR_SYNC_MODE_FULL);
3252
3253 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
3254 old_context = bdrv_get_aio_context(target_bs);
3255 aio_context = bdrv_get_aio_context(bs);
3256 aio_context_acquire(old_context);
3257
3258 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
3259
3260 aio_context_release(old_context);
3261 aio_context_acquire(aio_context);
3262
3263 if (ret < 0) {
3264 goto out;
3265 }
3266
3267 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3268 has_replaces, replaces, sync, backing_mode,
3269 zero_target, has_speed, speed,
3270 has_granularity, granularity,
3271 has_buf_size, buf_size,
3272 has_on_source_error, on_source_error,
3273 has_on_target_error, on_target_error,
3274 true, true,
3275 has_filter_node_name, filter_node_name,
3276 has_copy_mode, copy_mode,
3277 has_auto_finalize, auto_finalize,
3278 has_auto_dismiss, auto_dismiss,
3279 errp);
3280 out:
3281 aio_context_release(aio_context);
3282 }
3283
3284 /* Get a block job using its ID and acquire its AioContext */
3285 static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3286 Error **errp)
3287 {
3288 BlockJob *job;
3289
3290 assert(id != NULL);
3291
3292 *aio_context = NULL;
3293
3294 job = block_job_get(id);
3295
3296 if (!job) {
3297 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3298 "Block job '%s' not found", id);
3299 return NULL;
3300 }
3301
3302 *aio_context = blk_get_aio_context(job->blk);
3303 aio_context_acquire(*aio_context);
3304
3305 return job;
3306 }
3307
3308 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3309 {
3310 AioContext *aio_context;
3311 BlockJob *job = find_block_job(device, &aio_context, errp);
3312
3313 if (!job) {
3314 return;
3315 }
3316
3317 block_job_set_speed(job, speed, errp);
3318 aio_context_release(aio_context);
3319 }
3320
3321 void qmp_block_job_cancel(const char *device,
3322 bool has_force, bool force, Error **errp)
3323 {
3324 AioContext *aio_context;
3325 BlockJob *job = find_block_job(device, &aio_context, errp);
3326
3327 if (!job) {
3328 return;
3329 }
3330
3331 if (!has_force) {
3332 force = false;
3333 }
3334
3335 if (job_user_paused(&job->job) && !force) {
3336 error_setg(errp, "The block job for device '%s' is currently paused",
3337 device);
3338 goto out;
3339 }
3340
3341 trace_qmp_block_job_cancel(job);
3342 job_user_cancel(&job->job, force, errp);
3343 out:
3344 aio_context_release(aio_context);
3345 }
3346
3347 void qmp_block_job_pause(const char *device, Error **errp)
3348 {
3349 AioContext *aio_context;
3350 BlockJob *job = find_block_job(device, &aio_context, errp);
3351
3352 if (!job) {
3353 return;
3354 }
3355
3356 trace_qmp_block_job_pause(job);
3357 job_user_pause(&job->job, errp);
3358 aio_context_release(aio_context);
3359 }
3360
3361 void qmp_block_job_resume(const char *device, Error **errp)
3362 {
3363 AioContext *aio_context;
3364 BlockJob *job = find_block_job(device, &aio_context, errp);
3365
3366 if (!job) {
3367 return;
3368 }
3369
3370 trace_qmp_block_job_resume(job);
3371 job_user_resume(&job->job, errp);
3372 aio_context_release(aio_context);
3373 }
3374
3375 void qmp_block_job_complete(const char *device, Error **errp)
3376 {
3377 AioContext *aio_context;
3378 BlockJob *job = find_block_job(device, &aio_context, errp);
3379
3380 if (!job) {
3381 return;
3382 }
3383
3384 trace_qmp_block_job_complete(job);
3385 job_complete(&job->job, errp);
3386 aio_context_release(aio_context);
3387 }
3388
3389 void qmp_block_job_finalize(const char *id, Error **errp)
3390 {
3391 AioContext *aio_context;
3392 BlockJob *job = find_block_job(id, &aio_context, errp);
3393
3394 if (!job) {
3395 return;
3396 }
3397
3398 trace_qmp_block_job_finalize(job);
3399 job_ref(&job->job);
3400 job_finalize(&job->job, errp);
3401
3402 /*
3403 * Job's context might have changed via job_finalize (and job_txn_apply
3404 * automatically acquires the new one), so make sure we release the correct
3405 * one.
3406 */
3407 aio_context = blk_get_aio_context(job->blk);
3408 job_unref(&job->job);
3409 aio_context_release(aio_context);
3410 }
3411
3412 void qmp_block_job_dismiss(const char *id, Error **errp)
3413 {
3414 AioContext *aio_context;
3415 BlockJob *bjob = find_block_job(id, &aio_context, errp);
3416 Job *job;
3417
3418 if (!bjob) {
3419 return;
3420 }
3421
3422 trace_qmp_block_job_dismiss(bjob);
3423 job = &bjob->job;
3424 job_dismiss(&job, errp);
3425 aio_context_release(aio_context);
3426 }
3427
3428 void qmp_change_backing_file(const char *device,
3429 const char *image_node_name,
3430 const char *backing_file,
3431 Error **errp)
3432 {
3433 BlockDriverState *bs = NULL;
3434 AioContext *aio_context;
3435 BlockDriverState *image_bs = NULL;
3436 Error *local_err = NULL;
3437 bool ro;
3438 int ret;
3439
3440 bs = qmp_get_root_bs(device, errp);
3441 if (!bs) {
3442 return;
3443 }
3444
3445 aio_context = bdrv_get_aio_context(bs);
3446 aio_context_acquire(aio_context);
3447
3448 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3449 if (local_err) {
3450 error_propagate(errp, local_err);
3451 goto out;
3452 }
3453
3454 if (!image_bs) {
3455 error_setg(errp, "image file not found");
3456 goto out;
3457 }
3458
3459 if (bdrv_find_base(image_bs) == image_bs) {
3460 error_setg(errp, "not allowing backing file change on an image "
3461 "without a backing file");
3462 goto out;
3463 }
3464
3465 /* even though we are not necessarily operating on bs, we need it to
3466 * determine if block ops are currently prohibited on the chain */
3467 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3468 goto out;
3469 }
3470
3471 /* final sanity check */
3472 if (!bdrv_chain_contains(bs, image_bs)) {
3473 error_setg(errp, "'%s' and image file are not in the same chain",
3474 device);
3475 goto out;
3476 }
3477
3478 /* if not r/w, reopen to make r/w */
3479 ro = bdrv_is_read_only(image_bs);