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Update version for v8.1.0-rc2 release
[qemu/armbru.git] / blockdev.c
blobe6eba61484a7c0268aa84fc34c0f374b68de5bb0
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/dirty-bitmap.h"
39 #include "block/qdict.h"
40 #include "block/throttle-groups.h"
41 #include "monitor/monitor.h"
42 #include "qemu/error-report.h"
43 #include "qemu/option.h"
44 #include "qemu/qemu-print.h"
45 #include "qemu/config-file.h"
46 #include "qapi/qapi-commands-block.h"
47 #include "qapi/qapi-commands-transaction.h"
48 #include "qapi/qapi-visit-block-core.h"
49 #include "qapi/qmp/qdict.h"
50 #include "qapi/qmp/qnum.h"
51 #include "qapi/qmp/qstring.h"
52 #include "qapi/error.h"
53 #include "qapi/qmp/qerror.h"
54 #include "qapi/qmp/qlist.h"
55 #include "qapi/qobject-output-visitor.h"
56 #include "sysemu/sysemu.h"
57 #include "sysemu/iothread.h"
58 #include "block/block_int.h"
59 #include "block/trace.h"
60 #include "sysemu/runstate.h"
61 #include "sysemu/replay.h"
62 #include "qemu/cutils.h"
63 #include "qemu/help_option.h"
64 #include "qemu/main-loop.h"
65 #include "qemu/throttle-options.h"
66
67 /* Protected by BQL */
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 GLOBAL_STATE_CODE();
74 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
75 }
76
77 static const char *const if_name[IF_COUNT] = {
78 [IF_NONE] = "none",
79 [IF_IDE] = "ide",
80 [IF_SCSI] = "scsi",
81 [IF_FLOPPY] = "floppy",
82 [IF_PFLASH] = "pflash",
83 [IF_MTD] = "mtd",
84 [IF_SD] = "sd",
85 [IF_VIRTIO] = "virtio",
86 [IF_XEN] = "xen",
87 };
88
89 static int if_max_devs[IF_COUNT] = {
90 /*
91 * Do not change these numbers! They govern how drive option
92 * index maps to unit and bus. That mapping is ABI.
93 *
94 * All controllers used to implement if=T drives need to support
95 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
96 * Otherwise, some index values map to "impossible" bus, unit
97 * values.
98 *
99 * For instance, if you change [IF_SCSI] to 255, -drive
100 * if=scsi,index=12 no longer means bus=1,unit=5, but
101 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
102 * the drive can't be set up. Regression.
103 */
104 [IF_IDE] = 2,
105 [IF_SCSI] = 7,
106 };
107
108 /**
109 * Boards may call this to offer board-by-board overrides
110 * of the default, global values.
111 */
112 void override_max_devs(BlockInterfaceType type, int max_devs)
113 {
114 BlockBackend *blk;
115 DriveInfo *dinfo;
116
117 GLOBAL_STATE_CODE();
118
119 if (max_devs <= 0) {
120 return;
121 }
122
123 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
124 dinfo = blk_legacy_dinfo(blk);
125 if (dinfo->type == type) {
126 fprintf(stderr, "Cannot override units-per-bus property of"
127 " the %s interface, because a drive of that type has"
128 " already been added.\n", if_name[type]);
129 g_assert_not_reached();
130 }
131 }
132
133 if_max_devs[type] = max_devs;
134 }
135
136 /*
137 * We automatically delete the drive when a device using it gets
138 * unplugged. Questionable feature, but we can't just drop it.
139 * Device models call blockdev_mark_auto_del() to schedule the
140 * automatic deletion, and generic qdev code calls blockdev_auto_del()
141 * when deletion is actually safe.
142 */
143 void blockdev_mark_auto_del(BlockBackend *blk)
144 {
145 DriveInfo *dinfo = blk_legacy_dinfo(blk);
146 BlockJob *job;
147
148 GLOBAL_STATE_CODE();
149
150 if (!dinfo) {
151 return;
152 }
153
154 JOB_LOCK_GUARD();
155
156 do {
157 job = block_job_next_locked(NULL);
158 while (job && (job->job.cancelled ||
159 job->job.deferred_to_main_loop ||
160 !block_job_has_bdrv(job, blk_bs(blk))))
161 {
162 job = block_job_next_locked(job);
163 }
164 if (job) {
165 /*
166 * This drops the job lock temporarily and polls, so we need to
167 * restart processing the list from the start after this.
168 */
169 job_cancel_locked(&job->job, false);
170 }
171 } while (job);
172
173 dinfo->auto_del = 1;
174 }
175
176 void blockdev_auto_del(BlockBackend *blk)
177 {
178 DriveInfo *dinfo = blk_legacy_dinfo(blk);
179 GLOBAL_STATE_CODE();
180
181 if (dinfo && dinfo->auto_del) {
182 monitor_remove_blk(blk);
183 blk_unref(blk);
184 }
185 }
186
187 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
188 {
189 int max_devs = if_max_devs[type];
190 return max_devs ? index / max_devs : 0;
191 }
192
193 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
194 {
195 int max_devs = if_max_devs[type];
196 return max_devs ? index % max_devs : index;
197 }
198
199 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
200 const char *optstr)
201 {
202 QemuOpts *opts;
203
204 GLOBAL_STATE_CODE();
205
206 opts = qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
207 if (!opts) {
208 return NULL;
209 }
210 if (type != IF_DEFAULT) {
211 qemu_opt_set(opts, "if", if_name[type], &error_abort);
212 }
213 if (index >= 0) {
214 qemu_opt_set_number(opts, "index", index, &error_abort);
215 }
216 if (file)
217 qemu_opt_set(opts, "file", file, &error_abort);
218 return opts;
219 }
220
221 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
222 {
223 BlockBackend *blk;
224 DriveInfo *dinfo;
225
226 GLOBAL_STATE_CODE();
227
228 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
229 dinfo = blk_legacy_dinfo(blk);
230 if (dinfo && dinfo->type == type
231 && dinfo->bus == bus && dinfo->unit == unit) {
232 return dinfo;
233 }
234 }
235
236 return NULL;
237 }
238
239 /*
240 * Check board claimed all -drive that are meant to be claimed.
241 * Fatal error if any remain unclaimed.
242 */
243 void drive_check_orphaned(void)
244 {
245 BlockBackend *blk;
246 DriveInfo *dinfo;
247 Location loc;
248 bool orphans = false;
249
250 GLOBAL_STATE_CODE();
251
252 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
253 dinfo = blk_legacy_dinfo(blk);
254 /*
255 * Ignore default drives, because we create certain default
256 * drives unconditionally, then leave them unclaimed. Not the
257 * users fault.
258 * Ignore IF_VIRTIO, because it gets desugared into -device,
259 * so we can leave failing to -device.
260 * Ignore IF_NONE, because leaving unclaimed IF_NONE remains
261 * available for device_add is a feature.
262 */
263 if (dinfo->is_default || dinfo->type == IF_VIRTIO
264 || dinfo->type == IF_NONE) {
265 continue;
266 }
267 if (!blk_get_attached_dev(blk)) {
268 loc_push_none(&loc);
269 qemu_opts_loc_restore(dinfo->opts);
270 error_report("machine type does not support"
271 " if=%s,bus=%d,unit=%d",
272 if_name[dinfo->type], dinfo->bus, dinfo->unit);
273 loc_pop(&loc);
274 orphans = true;
275 }
276 }
277
278 if (orphans) {
279 exit(1);
280 }
281 }
282
283 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
284 {
285 GLOBAL_STATE_CODE();
286 return drive_get(type,
287 drive_index_to_bus_id(type, index),
288 drive_index_to_unit_id(type, index));
289 }
290
291 int drive_get_max_bus(BlockInterfaceType type)
292 {
293 int max_bus;
294 BlockBackend *blk;
295 DriveInfo *dinfo;
296
297 GLOBAL_STATE_CODE();
298
299 max_bus = -1;
300 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
301 dinfo = blk_legacy_dinfo(blk);
302 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
303 max_bus = dinfo->bus;
304 }
305 }
306 return max_bus;
307 }
308
309 static void bdrv_format_print(void *opaque, const char *name)
310 {
311 qemu_printf(" %s", name);
312 }
313
314 typedef struct {
315 QEMUBH *bh;
316 BlockDriverState *bs;
317 } BDRVPutRefBH;
318
319 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
320 {
321 if (!strcmp(buf, "ignore")) {
322 return BLOCKDEV_ON_ERROR_IGNORE;
323 } else if (!is_read && !strcmp(buf, "enospc")) {
324 return BLOCKDEV_ON_ERROR_ENOSPC;
325 } else if (!strcmp(buf, "stop")) {
326 return BLOCKDEV_ON_ERROR_STOP;
327 } else if (!strcmp(buf, "report")) {
328 return BLOCKDEV_ON_ERROR_REPORT;
329 } else {
330 error_setg(errp, "'%s' invalid %s error action",
331 buf, is_read ? "read" : "write");
332 return -1;
333 }
334 }
335
336 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
337 Error **errp)
338 {
339 const QListEntry *entry;
340 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
341 switch (qobject_type(entry->value)) {
342
343 case QTYPE_QSTRING: {
344 uint64_t length;
345 const char *str = qstring_get_str(qobject_to(QString,
346 entry->value));
347 if (parse_uint_full(str, 10, &length) == 0 &&
348 length > 0 && length <= UINT_MAX) {
349 block_acct_add_interval(stats, (unsigned) length);
350 } else {
351 error_setg(errp, "Invalid interval length: %s", str);
352 return false;
353 }
354 break;
355 }
356
357 case QTYPE_QNUM: {
358 int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
359
360 if (length > 0 && length <= UINT_MAX) {
361 block_acct_add_interval(stats, (unsigned) length);
362 } else {
363 error_setg(errp, "Invalid interval length: %" PRId64, length);
364 return false;
365 }
366 break;
367 }
368
369 default:
370 error_setg(errp, "The specification of stats-intervals is invalid");
371 return false;
372 }
373 }
374 return true;
375 }
376
377 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
378
379 /* All parameters but @opts are optional and may be set to NULL. */
380 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
381 const char **throttling_group, ThrottleConfig *throttle_cfg,
382 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
383 {
384 Error *local_error = NULL;
385 const char *aio;
386
387 if (bdrv_flags) {
388 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
389 *bdrv_flags |= BDRV_O_COPY_ON_READ;
390 }
391
392 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
393 if (bdrv_parse_aio(aio, bdrv_flags) < 0) {
394 error_setg(errp, "invalid aio option");
395 return;
396 }
397 }
398 }
399
400 /* disk I/O throttling */
401 if (throttling_group) {
402 *throttling_group = qemu_opt_get(opts, "throttling.group");
403 }
404
405 if (throttle_cfg) {
406 throttle_config_init(throttle_cfg);
407 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
408 qemu_opt_get_number(opts, "throttling.bps-total", 0);
409 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
410 qemu_opt_get_number(opts, "throttling.bps-read", 0);
411 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
412 qemu_opt_get_number(opts, "throttling.bps-write", 0);
413 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
414 qemu_opt_get_number(opts, "throttling.iops-total", 0);
415 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
416 qemu_opt_get_number(opts, "throttling.iops-read", 0);
417 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
418 qemu_opt_get_number(opts, "throttling.iops-write", 0);
419
420 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
421 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
422 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
423 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
424 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
425 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
426 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
427 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
428 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
429 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
430 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
431 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
432
433 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
434 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
435 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
436 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
437 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
438 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
439 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
440 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
441 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
442 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
443 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
444 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
445
446 throttle_cfg->op_size =
447 qemu_opt_get_number(opts, "throttling.iops-size", 0);
448
449 if (!throttle_is_valid(throttle_cfg, errp)) {
450 return;
451 }
452 }
453
454 if (detect_zeroes) {
455 *detect_zeroes =
456 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
457 qemu_opt_get(opts, "detect-zeroes"),
458 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
459 &local_error);
460 if (local_error) {
461 error_propagate(errp, local_error);
462 return;
463 }
464 }
465 }
466
467 static OnOffAuto account_get_opt(QemuOpts *opts, const char *name)
468 {
469 if (!qemu_opt_find(opts, name)) {
470 return ON_OFF_AUTO_AUTO;
471 }
472 if (qemu_opt_get_bool(opts, name, true)) {
473 return ON_OFF_AUTO_ON;
474 }
475 return ON_OFF_AUTO_OFF;
476 }
477
478 /* Takes the ownership of bs_opts */
479 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
480 Error **errp)
481 {
482 const char *buf;
483 int bdrv_flags = 0;
484 int on_read_error, on_write_error;
485 OnOffAuto account_invalid, account_failed;
486 bool writethrough, read_only;
487 BlockBackend *blk;
488 BlockDriverState *bs;
489 ThrottleConfig cfg;
490 int snapshot = 0;
491 Error *error = NULL;
492 QemuOpts *opts;
493 QDict *interval_dict = NULL;
494 QList *interval_list = NULL;
495 const char *id;
496 BlockdevDetectZeroesOptions detect_zeroes =
497 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
498 const char *throttling_group = NULL;
499
500 /* Check common options by copying from bs_opts to opts, all other options
501 * stay in bs_opts for processing by bdrv_open(). */
502 id = qdict_get_try_str(bs_opts, "id");
503 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, errp);
504 if (!opts) {
505 goto err_no_opts;
506 }
507
508 if (!qemu_opts_absorb_qdict(opts, bs_opts, errp)) {
509 goto early_err;
510 }
511
512 if (id) {
513 qdict_del(bs_opts, "id");
514 }
515
516 /* extract parameters */
517 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
518
519 account_invalid = account_get_opt(opts, "stats-account-invalid");
520 account_failed = account_get_opt(opts, "stats-account-failed");
521
522 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
523
524 id = qemu_opts_id(opts);
525
526 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
527 qdict_array_split(interval_dict, &interval_list);
528
529 if (qdict_size(interval_dict) != 0) {
530 error_setg(errp, "Invalid option stats-intervals.%s",
531 qdict_first(interval_dict)->key);
532 goto early_err;
533 }
534
535 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
536 &detect_zeroes, &error);
537 if (error) {
538 error_propagate(errp, error);
539 goto early_err;
540 }
541
542 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
543 if (is_help_option(buf)) {
544 qemu_printf("Supported formats:");
545 bdrv_iterate_format(bdrv_format_print, NULL, false);
546 qemu_printf("\nSupported formats (read-only):");
547 bdrv_iterate_format(bdrv_format_print, NULL, true);
548 qemu_printf("\n");
549 goto early_err;
550 }
551
552 if (qdict_haskey(bs_opts, "driver")) {
553 error_setg(errp, "Cannot specify both 'driver' and 'format'");
554 goto early_err;
555 }
556 qdict_put_str(bs_opts, "driver", buf);
557 }
558
559 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
560 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
561 on_write_error = parse_block_error_action(buf, 0, &error);
562 if (error) {
563 error_propagate(errp, error);
564 goto early_err;
565 }
566 }
567
568 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
569 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
570 on_read_error = parse_block_error_action(buf, 1, &error);
571 if (error) {
572 error_propagate(errp, error);
573 goto early_err;
574 }
575 }
576
577 if (snapshot) {
578 bdrv_flags |= BDRV_O_SNAPSHOT;
579 }
580
581 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
582
583 /* init */
584 if ((!file || !*file) && !qdict_size(bs_opts)) {
585 BlockBackendRootState *blk_rs;
586
587 blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL);
588 blk_rs = blk_get_root_state(blk);
589 blk_rs->open_flags = bdrv_flags | (read_only ? 0 : BDRV_O_RDWR);
590 blk_rs->detect_zeroes = detect_zeroes;
591
592 qobject_unref(bs_opts);
593 } else {
594 if (file && !*file) {
595 file = NULL;
596 }
597
598 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
599 * with other callers) rather than what we want as the real defaults.
600 * Apply the defaults here instead. */
601 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
602 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
603 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
604 read_only ? "on" : "off");
605 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on");
606 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
607
608 if (runstate_check(RUN_STATE_INMIGRATE)) {
609 bdrv_flags |= BDRV_O_INACTIVE;
610 }
611
612 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
613 if (!blk) {
614 goto err_no_bs_opts;
615 }
616 bs = blk_bs(blk);
617
618 bs->detect_zeroes = detect_zeroes;
619
620 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
621
622 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
623 blk_unref(blk);
624 blk = NULL;
625 goto err_no_bs_opts;
626 }
627 }
628
629 /* disk I/O throttling */
630 if (throttle_enabled(&cfg)) {
631 if (!throttling_group) {
632 throttling_group = id;
633 }
634 blk_io_limits_enable(blk, throttling_group);
635 blk_set_io_limits(blk, &cfg);
636 }
637
638 blk_set_enable_write_cache(blk, !writethrough);
639 blk_set_on_error(blk, on_read_error, on_write_error);
640
641 if (!monitor_add_blk(blk, id, errp)) {
642 blk_unref(blk);
643 blk = NULL;
644 goto err_no_bs_opts;
645 }
646
647 err_no_bs_opts:
648 qemu_opts_del(opts);
649 qobject_unref(interval_dict);
650 qobject_unref(interval_list);
651 return blk;
652
653 early_err:
654 qemu_opts_del(opts);
655 qobject_unref(interval_dict);
656 qobject_unref(interval_list);
657 err_no_opts:
658 qobject_unref(bs_opts);
659 return NULL;
660 }
661
662 /* Takes the ownership of bs_opts */
663 BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
664 {
665 BlockDriverState *bs;
666 int bdrv_flags = 0;
667
668 GLOBAL_STATE_CODE();
669 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
670 * with other callers) rather than what we want as the real defaults.
671 * Apply the defaults here instead. */
672 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
673 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
674 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
675
676 if (runstate_check(RUN_STATE_INMIGRATE)) {
677 bdrv_flags |= BDRV_O_INACTIVE;
678 }
679
680 aio_context_acquire(qemu_get_aio_context());
681 bs = bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
682 aio_context_release(qemu_get_aio_context());
683
684 return bs;
685 }
686
687 void blockdev_close_all_bdrv_states(void)
688 {
689 BlockDriverState *bs, *next_bs;
690
691 GLOBAL_STATE_CODE();
692 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
693 AioContext *ctx = bdrv_get_aio_context(bs);
694
695 aio_context_acquire(ctx);
696 bdrv_unref(bs);
697 aio_context_release(ctx);
698 }
699 }
700
701 /* Iterates over the list of monitor-owned BlockDriverStates */
702 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
703 {
704 GLOBAL_STATE_CODE();
705 return bs ? QTAILQ_NEXT(bs, monitor_list)
706 : QTAILQ_FIRST(&monitor_bdrv_states);
707 }
708
709 static bool qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
710 Error **errp)
711 {
712 const char *value;
713
714 value = qemu_opt_get(opts, from);
715 if (value) {
716 if (qemu_opt_find(opts, to)) {
717 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
718 "same time", to, from);
719 return false;
720 }
721 }
722
723 /* rename all items in opts */
724 while ((value = qemu_opt_get(opts, from))) {
725 qemu_opt_set(opts, to, value, &error_abort);
726 qemu_opt_unset(opts, from);
727 }
728 return true;
729 }
730
731 QemuOptsList qemu_legacy_drive_opts = {
732 .name = "drive",
733 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
734 .desc = {
735 {
736 .name = "bus",
737 .type = QEMU_OPT_NUMBER,
738 .help = "bus number",
739 },{
740 .name = "unit",
741 .type = QEMU_OPT_NUMBER,
742 .help = "unit number (i.e. lun for scsi)",
743 },{
744 .name = "index",
745 .type = QEMU_OPT_NUMBER,
746 .help = "index number",
747 },{
748 .name = "media",
749 .type = QEMU_OPT_STRING,
750 .help = "media type (disk, cdrom)",
751 },{
752 .name = "if",
753 .type = QEMU_OPT_STRING,
754 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
755 },{
756 .name = "file",
757 .type = QEMU_OPT_STRING,
758 .help = "file name",
759 },
760
761 /* Options that are passed on, but have special semantics with -drive */
762 {
763 .name = BDRV_OPT_READ_ONLY,
764 .type = QEMU_OPT_BOOL,
765 .help = "open drive file as read-only",
766 },{
767 .name = "rerror",
768 .type = QEMU_OPT_STRING,
769 .help = "read error action",
770 },{
771 .name = "werror",
772 .type = QEMU_OPT_STRING,
773 .help = "write error action",
774 },{
775 .name = "copy-on-read",
776 .type = QEMU_OPT_BOOL,
777 .help = "copy read data from backing file into image file",
778 },
779
780 { /* end of list */ }
781 },
782 };
783
784 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type,
785 Error **errp)
786 {
787 const char *value;
788 BlockBackend *blk;
789 DriveInfo *dinfo = NULL;
790 QDict *bs_opts;
791 QemuOpts *legacy_opts;
792 DriveMediaType media = MEDIA_DISK;
793 BlockInterfaceType type;
794 int max_devs, bus_id, unit_id, index;
795 const char *werror, *rerror;
796 bool read_only = false;
797 bool copy_on_read;
798 const char *filename;
799 int i;
800
801 GLOBAL_STATE_CODE();
802
803 /* Change legacy command line options into QMP ones */
804 static const struct {
805 const char *from;
806 const char *to;
807 } opt_renames[] = {
808 { "iops", "throttling.iops-total" },
809 { "iops_rd", "throttling.iops-read" },
810 { "iops_wr", "throttling.iops-write" },
811
812 { "bps", "throttling.bps-total" },
813 { "bps_rd", "throttling.bps-read" },
814 { "bps_wr", "throttling.bps-write" },
815
816 { "iops_max", "throttling.iops-total-max" },
817 { "iops_rd_max", "throttling.iops-read-max" },
818 { "iops_wr_max", "throttling.iops-write-max" },
819
820 { "bps_max", "throttling.bps-total-max" },
821 { "bps_rd_max", "throttling.bps-read-max" },
822 { "bps_wr_max", "throttling.bps-write-max" },
823
824 { "iops_size", "throttling.iops-size" },
825
826 { "group", "throttling.group" },
827
828 { "readonly", BDRV_OPT_READ_ONLY },
829 };
830
831 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
832 if (!qemu_opt_rename(all_opts, opt_renames[i].from,
833 opt_renames[i].to, errp)) {
834 return NULL;
835 }
836 }
837
838 value = qemu_opt_get(all_opts, "cache");
839 if (value) {
840 int flags = 0;
841 bool writethrough;
842
843 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
844 error_setg(errp, "invalid cache option");
845 return NULL;
846 }
847
848 /* Specific options take precedence */
849 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
850 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
851 !writethrough, &error_abort);
852 }
853 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
854 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
855 !!(flags & BDRV_O_NOCACHE), &error_abort);
856 }
857 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
858 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
859 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
860 }
861 qemu_opt_unset(all_opts, "cache");
862 }
863
864 /* Get a QDict for processing the options */
865 bs_opts = qdict_new();
866 qemu_opts_to_qdict(all_opts, bs_opts);
867
868 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
869 &error_abort);
870 if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) {
871 goto fail;
872 }
873
874 /* Media type */
875 value = qemu_opt_get(legacy_opts, "media");
876 if (value) {
877 if (!strcmp(value, "disk")) {
878 media = MEDIA_DISK;
879 } else if (!strcmp(value, "cdrom")) {
880 media = MEDIA_CDROM;
881 read_only = true;
882 } else {
883 error_setg(errp, "'%s' invalid media", value);
884 goto fail;
885 }
886 }
887
888 /* copy-on-read is disabled with a warning for read-only devices */
889 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
890 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
891
892 if (read_only && copy_on_read) {
893 warn_report("disabling copy-on-read on read-only drive");
894 copy_on_read = false;
895 }
896
897 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
898 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
899
900 /* Controller type */
901 value = qemu_opt_get(legacy_opts, "if");
902 if (value) {
903 for (type = 0;
904 type < IF_COUNT && strcmp(value, if_name[type]);
905 type++) {
906 }
907 if (type == IF_COUNT) {
908 error_setg(errp, "unsupported bus type '%s'", value);
909 goto fail;
910 }
911 } else {
912 type = block_default_type;
913 }
914
915 /* Device address specified by bus/unit or index.
916 * If none was specified, try to find the first free one. */
917 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
918 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
919 index = qemu_opt_get_number(legacy_opts, "index", -1);
920
921 max_devs = if_max_devs[type];
922
923 if (index != -1) {
924 if (bus_id != 0 || unit_id != -1) {
925 error_setg(errp, "index cannot be used with bus and unit");
926 goto fail;
927 }
928 bus_id = drive_index_to_bus_id(type, index);
929 unit_id = drive_index_to_unit_id(type, index);
930 }
931
932 if (unit_id == -1) {
933 unit_id = 0;
934 while (drive_get(type, bus_id, unit_id) != NULL) {
935 unit_id++;
936 if (max_devs && unit_id >= max_devs) {
937 unit_id -= max_devs;
938 bus_id++;
939 }
940 }
941 }
942
943 if (max_devs && unit_id >= max_devs) {
944 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1);
945 goto fail;
946 }
947
948 if (drive_get(type, bus_id, unit_id) != NULL) {
949 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists",
950 bus_id, unit_id, index);
951 goto fail;
952 }
953
954 /* no id supplied -> create one */
955 if (qemu_opts_id(all_opts) == NULL) {
956 char *new_id;
957 const char *mediastr = "";
958 if (type == IF_IDE || type == IF_SCSI) {
959 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
960 }
961 if (max_devs) {
962 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
963 mediastr, unit_id);
964 } else {
965 new_id = g_strdup_printf("%s%s%i", if_name[type],
966 mediastr, unit_id);
967 }
968 qdict_put_str(bs_opts, "id", new_id);
969 g_free(new_id);
970 }
971
972 /* Add virtio block device */
973 if (type == IF_VIRTIO) {
974 QemuOpts *devopts;
975 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
976 &error_abort);
977 qemu_opt_set(devopts, "driver", "virtio-blk", &error_abort);
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 AioContext *aio_context;
1043
1044 bs = bdrv_lookup_bs(name, name, errp);
1045 if (bs == NULL) {
1046 return NULL;
1047 }
1048
1049 if (!bdrv_is_root_node(bs)) {
1050 error_setg(errp, "Need a root block node");
1051 return NULL;
1052 }
1053
1054 aio_context = bdrv_get_aio_context(bs);
1055 aio_context_acquire(aio_context);
1056
1057 if (!bdrv_is_inserted(bs)) {
1058 error_setg(errp, "Device has no medium");
1059 bs = NULL;
1060 }
1061
1062 aio_context_release(aio_context);
1063
1064 return bs;
1065 }
1066
1067 static void blockdev_do_action(TransactionAction *action, Error **errp)
1068 {
1069 TransactionActionList list;
1070
1071 list.value = action;
1072 list.next = NULL;
1073 qmp_transaction(&list, NULL, errp);
1074 }
1075
1076 void qmp_blockdev_snapshot_sync(const char *device, const char *node_name,
1077 const char *snapshot_file,
1078 const char *snapshot_node_name,
1079 const char *format,
1080 bool has_mode, NewImageMode mode, Error **errp)
1081 {
1082 BlockdevSnapshotSync snapshot = {
1083 .device = (char *) device,
1084 .node_name = (char *) node_name,
1085 .snapshot_file = (char *) snapshot_file,
1086 .snapshot_node_name = (char *) snapshot_node_name,
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 const char *id,
1129 const char *name,
1130 Error **errp)
1131 {
1132 BlockDriverState *bs;
1133 AioContext *aio_context;
1134 QEMUSnapshotInfo sn;
1135 Error *local_err = NULL;
1136 SnapshotInfo *info = NULL;
1137 int ret;
1138
1139 bs = qmp_get_root_bs(device, errp);
1140 if (!bs) {
1141 return NULL;
1142 }
1143 aio_context = bdrv_get_aio_context(bs);
1144 aio_context_acquire(aio_context);
1145
1146 if (!id && !name) {
1147 error_setg(errp, "Name or id must be provided");
1148 goto out_aio_context;
1149 }
1150
1151 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1152 goto out_aio_context;
1153 }
1154
1155 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1156 if (local_err) {
1157 error_propagate(errp, local_err);
1158 goto out_aio_context;
1159 }
1160 if (!ret) {
1161 error_setg(errp,
1162 "Snapshot with id '%s' and name '%s' does not exist on "
1163 "device '%s'",
1164 STR_OR_NULL(id), STR_OR_NULL(name), device);
1165 goto out_aio_context;
1166 }
1167
1168 bdrv_snapshot_delete(bs, id, name, &local_err);
1169 if (local_err) {
1170 error_propagate(errp, local_err);
1171 goto out_aio_context;
1172 }
1173
1174 aio_context_release(aio_context);
1175
1176 info = g_new0(SnapshotInfo, 1);
1177 info->id = g_strdup(sn.id_str);
1178 info->name = g_strdup(sn.name);
1179 info->date_nsec = sn.date_nsec;
1180 info->date_sec = sn.date_sec;
1181 info->vm_state_size = sn.vm_state_size;
1182 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1183 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1184 if (sn.icount != -1ULL) {
1185 info->icount = sn.icount;
1186 info->has_icount = true;
1187 }
1188
1189 return info;
1190
1191 out_aio_context:
1192 aio_context_release(aio_context);
1193 return NULL;
1194 }
1195
1196 /* internal snapshot private data */
1197 typedef struct InternalSnapshotState {
1198 BlockDriverState *bs;
1199 QEMUSnapshotInfo sn;
1200 bool created;
1201 } InternalSnapshotState;
1202
1203 static void internal_snapshot_abort(void *opaque);
1204 static void internal_snapshot_clean(void *opaque);
1205 TransactionActionDrv internal_snapshot_drv = {
1206 .abort = internal_snapshot_abort,
1207 .clean = internal_snapshot_clean,
1208 };
1209
1210 static void internal_snapshot_action(BlockdevSnapshotInternal *internal,
1211 Transaction *tran, Error **errp)
1212 {
1213 Error *local_err = NULL;
1214 const char *device;
1215 const char *name;
1216 BlockDriverState *bs;
1217 QEMUSnapshotInfo old_sn, *sn;
1218 bool ret;
1219 int64_t rt;
1220 InternalSnapshotState *state = g_new0(InternalSnapshotState, 1);
1221 AioContext *aio_context;
1222 int ret1;
1223
1224 tran_add(tran, &internal_snapshot_drv, state);
1225
1226 device = internal->device;
1227 name = internal->name;
1228
1229 bs = qmp_get_root_bs(device, errp);
1230 if (!bs) {
1231 return;
1232 }
1233
1234 aio_context = bdrv_get_aio_context(bs);
1235 aio_context_acquire(aio_context);
1236
1237 state->bs = bs;
1238
1239 /* Paired with .clean() */
1240 bdrv_drained_begin(bs);
1241
1242 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1243 goto out;
1244 }
1245
1246 if (bdrv_is_read_only(bs)) {
1247 error_setg(errp, "Device '%s' is read only", device);
1248 goto out;
1249 }
1250
1251 if (!bdrv_can_snapshot(bs)) {
1252 error_setg(errp, "Block format '%s' used by device '%s' "
1253 "does not support internal snapshots",
1254 bs->drv->format_name, device);
1255 goto out;
1256 }
1257
1258 if (!strlen(name)) {
1259 error_setg(errp, "Name is empty");
1260 goto out;
1261 }
1262
1263 /* check whether a snapshot with name exist */
1264 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1265 &local_err);
1266 if (local_err) {
1267 error_propagate(errp, local_err);
1268 goto out;
1269 } else if (ret) {
1270 error_setg(errp,
1271 "Snapshot with name '%s' already exists on device '%s'",
1272 name, device);
1273 goto out;
1274 }
1275
1276 /* 3. take the snapshot */
1277 sn = &state->sn;
1278 pstrcpy(sn->name, sizeof(sn->name), name);
1279 rt = g_get_real_time();
1280 sn->date_sec = rt / G_USEC_PER_SEC;
1281 sn->date_nsec = (rt % G_USEC_PER_SEC) * 1000;
1282 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1283 if (replay_mode != REPLAY_MODE_NONE) {
1284 sn->icount = replay_get_current_icount();
1285 } else {
1286 sn->icount = -1ULL;
1287 }
1288
1289 ret1 = bdrv_snapshot_create(bs, sn);
1290 if (ret1 < 0) {
1291 error_setg_errno(errp, -ret1,
1292 "Failed to create snapshot '%s' on device '%s'",
1293 name, device);
1294 goto out;
1295 }
1296
1297 /* 4. succeed, mark a snapshot is created */
1298 state->created = true;
1299
1300 out:
1301 aio_context_release(aio_context);
1302 }
1303
1304 static void internal_snapshot_abort(void *opaque)
1305 {
1306 InternalSnapshotState *state = opaque;
1307 BlockDriverState *bs = state->bs;
1308 QEMUSnapshotInfo *sn = &state->sn;
1309 AioContext *aio_context;
1310 Error *local_error = NULL;
1311
1312 if (!state->created) {
1313 return;
1314 }
1315
1316 aio_context = bdrv_get_aio_context(state->bs);
1317 aio_context_acquire(aio_context);
1318
1319 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1320 error_reportf_err(local_error,
1321 "Failed to delete snapshot with id '%s' and "
1322 "name '%s' on device '%s' in abort: ",
1323 sn->id_str, sn->name,
1324 bdrv_get_device_name(bs));
1325 }
1326
1327 aio_context_release(aio_context);
1328 }
1329
1330 static void internal_snapshot_clean(void *opaque)
1331 {
1332 g_autofree InternalSnapshotState *state = opaque;
1333 AioContext *aio_context;
1334
1335 if (!state->bs) {
1336 return;
1337 }
1338
1339 aio_context = bdrv_get_aio_context(state->bs);
1340 aio_context_acquire(aio_context);
1341
1342 bdrv_drained_end(state->bs);
1343
1344 aio_context_release(aio_context);
1345 }
1346
1347 /* external snapshot private data */
1348 typedef struct ExternalSnapshotState {
1349 BlockDriverState *old_bs;
1350 BlockDriverState *new_bs;
1351 bool overlay_appended;
1352 } ExternalSnapshotState;
1353
1354 static void external_snapshot_commit(void *opaque);
1355 static void external_snapshot_abort(void *opaque);
1356 static void external_snapshot_clean(void *opaque);
1357 TransactionActionDrv external_snapshot_drv = {
1358 .commit = external_snapshot_commit,
1359 .abort = external_snapshot_abort,
1360 .clean = external_snapshot_clean,
1361 };
1362
1363 static void external_snapshot_action(TransactionAction *action,
1364 Transaction *tran, Error **errp)
1365 {
1366 int ret;
1367 int flags = 0;
1368 QDict *options = NULL;
1369 Error *local_err = NULL;
1370 /* Device and node name of the image to generate the snapshot from */
1371 const char *device;
1372 const char *node_name;
1373 /* Reference to the new image (for 'blockdev-snapshot') */
1374 const char *snapshot_ref;
1375 /* File name of the new image (for 'blockdev-snapshot-sync') */
1376 const char *new_image_file;
1377 ExternalSnapshotState *state = g_new0(ExternalSnapshotState, 1);
1378 AioContext *aio_context;
1379 uint64_t perm, shared;
1380
1381 tran_add(tran, &external_snapshot_drv, state);
1382
1383 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1384 * purpose but a different set of parameters */
1385 switch (action->type) {
1386 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1387 {
1388 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1389 device = s->node;
1390 node_name = s->node;
1391 new_image_file = NULL;
1392 snapshot_ref = s->overlay;
1393 }
1394 break;
1395 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1396 {
1397 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1398 device = s->device;
1399 node_name = s->node_name;
1400 new_image_file = s->snapshot_file;
1401 snapshot_ref = NULL;
1402 }
1403 break;
1404 default:
1405 g_assert_not_reached();
1406 }
1407
1408 /* start processing */
1409
1410 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1411 if (!state->old_bs) {
1412 return;
1413 }
1414
1415 aio_context = bdrv_get_aio_context(state->old_bs);
1416 aio_context_acquire(aio_context);
1417
1418 /* Paired with .clean() */
1419 bdrv_drained_begin(state->old_bs);
1420
1421 if (!bdrv_is_inserted(state->old_bs)) {
1422 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1423 goto out;
1424 }
1425
1426 if (bdrv_op_is_blocked(state->old_bs,
1427 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1428 goto out;
1429 }
1430
1431 if (!bdrv_is_read_only(state->old_bs)) {
1432 if (bdrv_flush(state->old_bs)) {
1433 error_setg(errp, QERR_IO_ERROR);
1434 goto out;
1435 }
1436 }
1437
1438 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1439 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1440 const char *format = s->format ?: "qcow2";
1441 enum NewImageMode mode;
1442 const char *snapshot_node_name = s->snapshot_node_name;
1443
1444 if (node_name && !snapshot_node_name) {
1445 error_setg(errp, "New overlay node-name missing");
1446 goto out;
1447 }
1448
1449 if (snapshot_node_name &&
1450 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1451 error_setg(errp, "New overlay node-name already in use");
1452 goto out;
1453 }
1454
1455 flags = state->old_bs->open_flags;
1456 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1457 flags |= BDRV_O_NO_BACKING;
1458
1459 /* create new image w/backing file */
1460 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1461 if (mode != NEW_IMAGE_MODE_EXISTING) {
1462 int64_t size = bdrv_getlength(state->old_bs);
1463 if (size < 0) {
1464 error_setg_errno(errp, -size, "bdrv_getlength failed");
1465 goto out;
1466 }
1467 bdrv_refresh_filename(state->old_bs);
1468
1469 aio_context_release(aio_context);
1470 bdrv_img_create(new_image_file, format,
1471 state->old_bs->filename,
1472 state->old_bs->drv->format_name,
1473 NULL, size, flags, false, &local_err);
1474 aio_context_acquire(aio_context);
1475
1476 if (local_err) {
1477 error_propagate(errp, local_err);
1478 goto out;
1479 }
1480 }
1481
1482 options = qdict_new();
1483 if (snapshot_node_name) {
1484 qdict_put_str(options, "node-name", snapshot_node_name);
1485 }
1486 qdict_put_str(options, "driver", format);
1487 }
1488 aio_context_release(aio_context);
1489
1490 aio_context_acquire(qemu_get_aio_context());
1491 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1492 errp);
1493 aio_context_release(qemu_get_aio_context());
1494
1495 /* We will manually add the backing_hd field to the bs later */
1496 if (!state->new_bs) {
1497 return;
1498 }
1499
1500 aio_context_acquire(aio_context);
1501
1502 /*
1503 * Allow attaching a backing file to an overlay that's already in use only
1504 * if the parents don't assume that they are already seeing a valid image.
1505 * (Specifically, allow it as a mirror target, which is write-only access.)
1506 */
1507 bdrv_get_cumulative_perm(state->new_bs, &perm, &shared);
1508 if (perm & BLK_PERM_CONSISTENT_READ) {
1509 error_setg(errp, "The overlay is already in use");
1510 goto out;
1511 }
1512
1513 if (state->new_bs->drv->is_filter) {
1514 error_setg(errp, "Filters cannot be used as overlays");
1515 goto out;
1516 }
1517
1518 if (bdrv_cow_child(state->new_bs)) {
1519 error_setg(errp, "The overlay already has a backing image");
1520 goto out;
1521 }
1522
1523 if (!state->new_bs->drv->supports_backing) {
1524 error_setg(errp, "The overlay does not support backing images");
1525 goto out;
1526 }
1527
1528 ret = bdrv_append(state->new_bs, state->old_bs, errp);
1529 if (ret < 0) {
1530 goto out;
1531 }
1532 state->overlay_appended = true;
1533
1534 out:
1535 aio_context_release(aio_context);
1536 }
1537
1538 static void external_snapshot_commit(void *opaque)
1539 {
1540 ExternalSnapshotState *state = opaque;
1541 AioContext *aio_context;
1542
1543 aio_context = bdrv_get_aio_context(state->old_bs);
1544 aio_context_acquire(aio_context);
1545
1546 /* We don't need (or want) to use the transactional
1547 * bdrv_reopen_multiple() across all the entries at once, because we
1548 * don't want to abort all of them if one of them fails the reopen */
1549 if (!qatomic_read(&state->old_bs->copy_on_read)) {
1550 bdrv_reopen_set_read_only(state->old_bs, true, NULL);
1551 }
1552
1553 aio_context_release(aio_context);
1554 }
1555
1556 static void external_snapshot_abort(void *opaque)
1557 {
1558 ExternalSnapshotState *state = opaque;
1559 if (state->new_bs) {
1560 if (state->overlay_appended) {
1561 AioContext *aio_context;
1562 AioContext *tmp_context;
1563 int ret;
1564
1565 aio_context = bdrv_get_aio_context(state->old_bs);
1566 aio_context_acquire(aio_context);
1567
1568 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1569 close state->old_bs; we need it */
1570 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1571
1572 /*
1573 * The call to bdrv_set_backing_hd() above returns state->old_bs to
1574 * the main AioContext. As we're still going to be using it, return
1575 * it to the AioContext it was before.
1576 */
1577 tmp_context = bdrv_get_aio_context(state->old_bs);
1578 if (aio_context != tmp_context) {
1579 aio_context_release(aio_context);
1580 aio_context_acquire(tmp_context);
1581
1582 ret = bdrv_try_change_aio_context(state->old_bs,
1583 aio_context, NULL, NULL);
1584 assert(ret == 0);
1585
1586 aio_context_release(tmp_context);
1587 aio_context_acquire(aio_context);
1588 }
1589
1590 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1591 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1592
1593 aio_context_release(aio_context);
1594 }
1595 }
1596 }
1597
1598 static void external_snapshot_clean(void *opaque)
1599 {
1600 g_autofree ExternalSnapshotState *state = opaque;
1601 AioContext *aio_context;
1602
1603 if (!state->old_bs) {
1604 return;
1605 }
1606
1607 aio_context = bdrv_get_aio_context(state->old_bs);
1608 aio_context_acquire(aio_context);
1609
1610 bdrv_drained_end(state->old_bs);
1611 bdrv_unref(state->new_bs);
1612
1613 aio_context_release(aio_context);
1614 }
1615
1616 typedef struct DriveBackupState {
1617 BlockDriverState *bs;
1618 BlockJob *job;
1619 } DriveBackupState;
1620
1621 static BlockJob *do_backup_common(BackupCommon *backup,
1622 BlockDriverState *bs,
1623 BlockDriverState *target_bs,
1624 AioContext *aio_context,
1625 JobTxn *txn, Error **errp);
1626
1627 static void drive_backup_commit(void *opaque);
1628 static void drive_backup_abort(void *opaque);
1629 static void drive_backup_clean(void *opaque);
1630 TransactionActionDrv drive_backup_drv = {
1631 .commit = drive_backup_commit,
1632 .abort = drive_backup_abort,
1633 .clean = drive_backup_clean,
1634 };
1635
1636 static void drive_backup_action(DriveBackup *backup,
1637 JobTxn *block_job_txn,
1638 Transaction *tran, Error **errp)
1639 {
1640 DriveBackupState *state = g_new0(DriveBackupState, 1);
1641 BlockDriverState *bs;
1642 BlockDriverState *target_bs;
1643 BlockDriverState *source = NULL;
1644 AioContext *aio_context;
1645 AioContext *old_context;
1646 const char *format;
1647 QDict *options;
1648 Error *local_err = NULL;
1649 int flags;
1650 int64_t size;
1651 bool set_backing_hd = false;
1652 int ret;
1653
1654 tran_add(tran, &drive_backup_drv, state);
1655
1656 if (!backup->has_mode) {
1657 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1658 }
1659
1660 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1661 if (!bs) {
1662 return;
1663 }
1664
1665 if (!bs->drv) {
1666 error_setg(errp, "Device has no medium");
1667 return;
1668 }
1669
1670 aio_context = bdrv_get_aio_context(bs);
1671 aio_context_acquire(aio_context);
1672
1673 state->bs = bs;
1674 /* Paired with .clean() */
1675 bdrv_drained_begin(bs);
1676
1677 format = backup->format;
1678 if (!format && backup->mode != NEW_IMAGE_MODE_EXISTING) {
1679 format = bs->drv->format_name;
1680 }
1681
1682 /* Early check to avoid creating target */
1683 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
1684 goto out;
1685 }
1686
1687 flags = bs->open_flags | BDRV_O_RDWR;
1688
1689 /*
1690 * See if we have a backing HD we can use to create our new image
1691 * on top of.
1692 */
1693 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
1694 /*
1695 * Backup will not replace the source by the target, so none
1696 * of the filters skipped here will be removed (in contrast to
1697 * mirror). Therefore, we can skip all of them when looking
1698 * for the first COW relationship.
1699 */
1700 source = bdrv_cow_bs(bdrv_skip_filters(bs));
1701 if (!source) {
1702 backup->sync = MIRROR_SYNC_MODE_FULL;
1703 }
1704 }
1705 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
1706 source = bs;
1707 flags |= BDRV_O_NO_BACKING;
1708 set_backing_hd = true;
1709 }
1710
1711 size = bdrv_getlength(bs);
1712 if (size < 0) {
1713 error_setg_errno(errp, -size, "bdrv_getlength failed");
1714 goto out;
1715 }
1716
1717 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
1718 assert(format);
1719 if (source) {
1720 /* Implicit filters should not appear in the filename */
1721 BlockDriverState *explicit_backing =
1722 bdrv_skip_implicit_filters(source);
1723
1724 bdrv_refresh_filename(explicit_backing);
1725 bdrv_img_create(backup->target, format,
1726 explicit_backing->filename,
1727 explicit_backing->drv->format_name, NULL,
1728 size, flags, false, &local_err);
1729 } else {
1730 bdrv_img_create(backup->target, format, NULL, NULL, NULL,
1731 size, flags, false, &local_err);
1732 }
1733 }
1734
1735 if (local_err) {
1736 error_propagate(errp, local_err);
1737 goto out;
1738 }
1739
1740 options = qdict_new();
1741 qdict_put_str(options, "discard", "unmap");
1742 qdict_put_str(options, "detect-zeroes", "unmap");
1743 if (format) {
1744 qdict_put_str(options, "driver", format);
1745 }
1746 aio_context_release(aio_context);
1747
1748 aio_context_acquire(qemu_get_aio_context());
1749 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
1750 aio_context_release(qemu_get_aio_context());
1751
1752 if (!target_bs) {
1753 return;
1754 }
1755
1756 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */
1757 old_context = bdrv_get_aio_context(target_bs);
1758 aio_context_acquire(old_context);
1759
1760 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
1761 if (ret < 0) {
1762 bdrv_unref(target_bs);
1763 aio_context_release(old_context);
1764 return;
1765 }
1766
1767 aio_context_release(old_context);
1768 aio_context_acquire(aio_context);
1769
1770 if (set_backing_hd) {
1771 if (bdrv_set_backing_hd(target_bs, source, errp) < 0) {
1772 goto unref;
1773 }
1774 }
1775
1776 state->job = do_backup_common(qapi_DriveBackup_base(backup),
1777 bs, target_bs, aio_context,
1778 block_job_txn, errp);
1779
1780 unref:
1781 bdrv_unref(target_bs);
1782 out:
1783 aio_context_release(aio_context);
1784 }
1785
1786 static void drive_backup_commit(void *opaque)
1787 {
1788 DriveBackupState *state = opaque;
1789 AioContext *aio_context;
1790
1791 aio_context = bdrv_get_aio_context(state->bs);
1792 aio_context_acquire(aio_context);
1793
1794 assert(state->job);
1795 job_start(&state->job->job);
1796
1797 aio_context_release(aio_context);
1798 }
1799
1800 static void drive_backup_abort(void *opaque)
1801 {
1802 DriveBackupState *state = opaque;
1803
1804 if (state->job) {
1805 job_cancel_sync(&state->job->job, true);
1806 }
1807 }
1808
1809 static void drive_backup_clean(void *opaque)
1810 {
1811 g_autofree DriveBackupState *state = opaque;
1812 AioContext *aio_context;
1813
1814 if (!state->bs) {
1815 return;
1816 }
1817
1818 aio_context = bdrv_get_aio_context(state->bs);
1819 aio_context_acquire(aio_context);
1820
1821 bdrv_drained_end(state->bs);
1822
1823 aio_context_release(aio_context);
1824 }
1825
1826 typedef struct BlockdevBackupState {
1827 BlockDriverState *bs;
1828 BlockJob *job;
1829 } BlockdevBackupState;
1830
1831 static void blockdev_backup_commit(void *opaque);
1832 static void blockdev_backup_abort(void *opaque);
1833 static void blockdev_backup_clean(void *opaque);
1834 TransactionActionDrv blockdev_backup_drv = {
1835 .commit = blockdev_backup_commit,
1836 .abort = blockdev_backup_abort,
1837 .clean = blockdev_backup_clean,
1838 };
1839
1840 static void blockdev_backup_action(BlockdevBackup *backup,
1841 JobTxn *block_job_txn,
1842 Transaction *tran, Error **errp)
1843 {
1844 BlockdevBackupState *state = g_new0(BlockdevBackupState, 1);
1845 BlockDriverState *bs;
1846 BlockDriverState *target_bs;
1847 AioContext *aio_context;
1848 AioContext *old_context;
1849 int ret;
1850
1851 tran_add(tran, &blockdev_backup_drv, state);
1852
1853 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1854 if (!bs) {
1855 return;
1856 }
1857
1858 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
1859 if (!target_bs) {
1860 return;
1861 }
1862
1863 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */
1864 aio_context = bdrv_get_aio_context(bs);
1865 old_context = bdrv_get_aio_context(target_bs);
1866 aio_context_acquire(old_context);
1867
1868 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
1869 if (ret < 0) {
1870 aio_context_release(old_context);
1871 return;
1872 }
1873
1874 aio_context_release(old_context);
1875 aio_context_acquire(aio_context);
1876 state->bs = bs;
1877
1878 /* Paired with .clean() */
1879 bdrv_drained_begin(state->bs);
1880
1881 state->job = do_backup_common(qapi_BlockdevBackup_base(backup),
1882 bs, target_bs, aio_context,
1883 block_job_txn, errp);
1884
1885 aio_context_release(aio_context);
1886 }
1887
1888 static void blockdev_backup_commit(void *opaque)
1889 {
1890 BlockdevBackupState *state = opaque;
1891 AioContext *aio_context;
1892
1893 aio_context = bdrv_get_aio_context(state->bs);
1894 aio_context_acquire(aio_context);
1895
1896 assert(state->job);
1897 job_start(&state->job->job);
1898
1899 aio_context_release(aio_context);
1900 }
1901
1902 static void blockdev_backup_abort(void *opaque)
1903 {
1904 BlockdevBackupState *state = opaque;
1905
1906 if (state->job) {
1907 job_cancel_sync(&state->job->job, true);
1908 }
1909 }
1910
1911 static void blockdev_backup_clean(void *opaque)
1912 {
1913 g_autofree BlockdevBackupState *state = opaque;
1914 AioContext *aio_context;
1915
1916 if (!state->bs) {
1917 return;
1918 }
1919
1920 aio_context = bdrv_get_aio_context(state->bs);
1921 aio_context_acquire(aio_context);
1922
1923 bdrv_drained_end(state->bs);
1924
1925 aio_context_release(aio_context);
1926 }
1927
1928 typedef struct BlockDirtyBitmapState {
1929 BdrvDirtyBitmap *bitmap;
1930 BlockDriverState *bs;
1931 HBitmap *backup;
1932 bool was_enabled;
1933 } BlockDirtyBitmapState;
1934
1935 static void block_dirty_bitmap_add_abort(void *opaque);
1936 TransactionActionDrv block_dirty_bitmap_add_drv = {
1937 .abort = block_dirty_bitmap_add_abort,
1938 .clean = g_free,
1939 };
1940
1941 static void block_dirty_bitmap_add_action(BlockDirtyBitmapAdd *action,
1942 Transaction *tran, Error **errp)
1943 {
1944 Error *local_err = NULL;
1945 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
1946
1947 tran_add(tran, &block_dirty_bitmap_add_drv, state);
1948
1949 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1950 qmp_block_dirty_bitmap_add(action->node, action->name,
1951 action->has_granularity, action->granularity,
1952 action->has_persistent, action->persistent,
1953 action->has_disabled, action->disabled,
1954 &local_err);
1955
1956 if (!local_err) {
1957 state->bitmap = block_dirty_bitmap_lookup(action->node, action->name,
1958 NULL, &error_abort);
1959 } else {
1960 error_propagate(errp, local_err);
1961 }
1962 }
1963
1964 static void block_dirty_bitmap_add_abort(void *opaque)
1965 {
1966 BlockDirtyBitmapState *state = opaque;
1967
1968 if (state->bitmap) {
1969 bdrv_release_dirty_bitmap(state->bitmap);
1970 }
1971 }
1972
1973 static void block_dirty_bitmap_restore(void *opaque);
1974 static void block_dirty_bitmap_free_backup(void *opaque);
1975 TransactionActionDrv block_dirty_bitmap_clear_drv = {
1976 .abort = block_dirty_bitmap_restore,
1977 .commit = block_dirty_bitmap_free_backup,
1978 .clean = g_free,
1979 };
1980
1981 static void block_dirty_bitmap_clear_action(BlockDirtyBitmap *action,
1982 Transaction *tran, Error **errp)
1983 {
1984 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
1985
1986 tran_add(tran, &block_dirty_bitmap_clear_drv, state);
1987
1988 state->bitmap = block_dirty_bitmap_lookup(action->node,
1989 action->name,
1990 &state->bs,
1991 errp);
1992 if (!state->bitmap) {
1993 return;
1994 }
1995
1996 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) {
1997 return;
1998 }
1999
2000 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2001 }
2002
2003 static void block_dirty_bitmap_restore(void *opaque)
2004 {
2005 BlockDirtyBitmapState *state = opaque;
2006
2007 if (state->backup) {
2008 bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
2009 }
2010 }
2011
2012 static void block_dirty_bitmap_free_backup(void *opaque)
2013 {
2014 BlockDirtyBitmapState *state = opaque;
2015
2016 hbitmap_free(state->backup);
2017 }
2018
2019 static void block_dirty_bitmap_enable_abort(void *opaque);
2020 TransactionActionDrv block_dirty_bitmap_enable_drv = {
2021 .abort = block_dirty_bitmap_enable_abort,
2022 .clean = g_free,
2023 };
2024
2025 static void block_dirty_bitmap_enable_action(BlockDirtyBitmap *action,
2026 Transaction *tran, Error **errp)
2027 {
2028 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2029
2030 tran_add(tran, &block_dirty_bitmap_enable_drv, state);
2031
2032 state->bitmap = block_dirty_bitmap_lookup(action->node,
2033 action->name,
2034 NULL,
2035 errp);
2036 if (!state->bitmap) {
2037 return;
2038 }
2039
2040 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2041 return;
2042 }
2043
2044 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2045 bdrv_enable_dirty_bitmap(state->bitmap);
2046 }
2047
2048 static void block_dirty_bitmap_enable_abort(void *opaque)
2049 {
2050 BlockDirtyBitmapState *state = opaque;
2051
2052 if (!state->was_enabled) {
2053 bdrv_disable_dirty_bitmap(state->bitmap);
2054 }
2055 }
2056
2057 static void block_dirty_bitmap_disable_abort(void *opaque);
2058 TransactionActionDrv block_dirty_bitmap_disable_drv = {
2059 .abort = block_dirty_bitmap_disable_abort,
2060 .clean = g_free,
2061 };
2062
2063 static void block_dirty_bitmap_disable_action(BlockDirtyBitmap *action,
2064 Transaction *tran, Error **errp)
2065 {
2066 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2067
2068 tran_add(tran, &block_dirty_bitmap_disable_drv, state);
2069
2070 state->bitmap = block_dirty_bitmap_lookup(action->node,
2071 action->name,
2072 NULL,
2073 errp);
2074 if (!state->bitmap) {
2075 return;
2076 }
2077
2078 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2079 return;
2080 }
2081
2082 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2083 bdrv_disable_dirty_bitmap(state->bitmap);
2084 }
2085
2086 static void block_dirty_bitmap_disable_abort(void *opaque)
2087 {
2088 BlockDirtyBitmapState *state = opaque;
2089
2090 if (state->was_enabled) {
2091 bdrv_enable_dirty_bitmap(state->bitmap);
2092 }
2093 }
2094
2095 TransactionActionDrv block_dirty_bitmap_merge_drv = {
2096 .commit = block_dirty_bitmap_free_backup,
2097 .abort = block_dirty_bitmap_restore,
2098 .clean = g_free,
2099 };
2100
2101 static void block_dirty_bitmap_merge_action(BlockDirtyBitmapMerge *action,
2102 Transaction *tran, Error **errp)
2103 {
2104 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2105
2106 tran_add(tran, &block_dirty_bitmap_merge_drv, state);
2107
2108 state->bitmap = block_dirty_bitmap_merge(action->node, action->target,
2109 action->bitmaps, &state->backup,
2110 errp);
2111 }
2112
2113 static void block_dirty_bitmap_remove_commit(void *opaque);
2114 static void block_dirty_bitmap_remove_abort(void *opaque);
2115 TransactionActionDrv block_dirty_bitmap_remove_drv = {
2116 .commit = block_dirty_bitmap_remove_commit,
2117 .abort = block_dirty_bitmap_remove_abort,
2118 .clean = g_free,
2119 };
2120
2121 static void block_dirty_bitmap_remove_action(BlockDirtyBitmap *action,
2122 Transaction *tran, Error **errp)
2123 {
2124 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2125
2126 tran_add(tran, &block_dirty_bitmap_remove_drv, state);
2127
2128
2129 state->bitmap = block_dirty_bitmap_remove(action->node, action->name,
2130 false, &state->bs, errp);
2131 if (state->bitmap) {
2132 bdrv_dirty_bitmap_skip_store(state->bitmap, true);
2133 bdrv_dirty_bitmap_set_busy(state->bitmap, true);
2134 }
2135 }
2136
2137 static void block_dirty_bitmap_remove_abort(void *opaque)
2138 {
2139 BlockDirtyBitmapState *state = opaque;
2140
2141 if (state->bitmap) {
2142 bdrv_dirty_bitmap_skip_store(state->bitmap, false);
2143 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2144 }
2145 }
2146
2147 static void block_dirty_bitmap_remove_commit(void *opaque)
2148 {
2149 BlockDirtyBitmapState *state = opaque;
2150
2151 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2152 bdrv_release_dirty_bitmap(state->bitmap);
2153 }
2154
2155 static void abort_commit(void *opaque);
2156 TransactionActionDrv abort_drv = {
2157 .commit = abort_commit,
2158 };
2159
2160 static void abort_action(Transaction *tran, Error **errp)
2161 {
2162 tran_add(tran, &abort_drv, NULL);
2163 error_setg(errp, "Transaction aborted using Abort action");
2164 }
2165
2166 static void abort_commit(void *opaque)
2167 {
2168 g_assert_not_reached(); /* this action never succeeds */
2169 }
2170
2171 static void transaction_action(TransactionAction *act, JobTxn *block_job_txn,
2172 Transaction *tran, Error **errp)
2173 {
2174 switch (act->type) {
2175 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
2176 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
2177 external_snapshot_action(act, tran, errp);
2178 return;
2179 case TRANSACTION_ACTION_KIND_DRIVE_BACKUP:
2180 drive_backup_action(act->u.drive_backup.data,
2181 block_job_txn, tran, errp);
2182 return;
2183 case TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP:
2184 blockdev_backup_action(act->u.blockdev_backup.data,
2185 block_job_txn, tran, errp);
2186 return;
2187 case TRANSACTION_ACTION_KIND_ABORT:
2188 abort_action(tran, errp);
2189 return;
2190 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC:
2191 internal_snapshot_action(act->u.blockdev_snapshot_internal_sync.data,
2192 tran, errp);
2193 return;
2194 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD:
2195 block_dirty_bitmap_add_action(act->u.block_dirty_bitmap_add.data,
2196 tran, errp);
2197 return;
2198 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR:
2199 block_dirty_bitmap_clear_action(act->u.block_dirty_bitmap_clear.data,
2200 tran, errp);
2201 return;
2202 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE:
2203 block_dirty_bitmap_enable_action(act->u.block_dirty_bitmap_enable.data,
2204 tran, errp);
2205 return;
2206 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE:
2207 block_dirty_bitmap_disable_action(
2208 act->u.block_dirty_bitmap_disable.data, tran, errp);
2209 return;
2210 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE:
2211 block_dirty_bitmap_merge_action(act->u.block_dirty_bitmap_merge.data,
2212 tran, errp);
2213 return;
2214 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE:
2215 block_dirty_bitmap_remove_action(act->u.block_dirty_bitmap_remove.data,
2216 tran, errp);
2217 return;
2218 /*
2219 * Where are transactions for MIRROR, COMMIT and STREAM?
2220 * Although these blockjobs use transaction callbacks like the backup job,
2221 * these jobs do not necessarily adhere to transaction semantics.
2222 * These jobs may not fully undo all of their actions on abort, nor do they
2223 * necessarily work in transactions with more than one job in them.
2224 */
2225 case TRANSACTION_ACTION_KIND__MAX:
2226 default:
2227 g_assert_not_reached();
2228 };
2229 }
2230
2231
2232 /*
2233 * 'Atomic' group operations. The operations are performed as a set, and if
2234 * any fail then we roll back all operations in the group.
2235 *
2236 * Always run under BQL.
2237 */
2238 void qmp_transaction(TransactionActionList *actions,
2239 struct TransactionProperties *properties,
2240 Error **errp)
2241 {
2242 TransactionActionList *act;
2243 JobTxn *block_job_txn = NULL;
2244 Error *local_err = NULL;
2245 Transaction *tran;
2246 ActionCompletionMode comp_mode =
2247 properties ? properties->completion_mode :
2248 ACTION_COMPLETION_MODE_INDIVIDUAL;
2249
2250 GLOBAL_STATE_CODE();
2251
2252 /* Does this transaction get canceled as a group on failure?
2253 * If not, we don't really need to make a JobTxn.
2254 */
2255 if (comp_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2256 for (act = actions; act; act = act->next) {
2257 TransactionActionKind type = act->value->type;
2258
2259 if (type != TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP &&
2260 type != TRANSACTION_ACTION_KIND_DRIVE_BACKUP)
2261 {
2262 error_setg(errp,
2263 "Action '%s' does not support transaction property "
2264 "completion-mode = %s",
2265 TransactionActionKind_str(type),
2266 ActionCompletionMode_str(comp_mode));
2267 return;
2268 }
2269 }
2270
2271 block_job_txn = job_txn_new();
2272 }
2273
2274 /* drain all i/o before any operations */
2275 bdrv_drain_all();
2276
2277 tran = tran_new();
2278
2279 /* We don't do anything in this loop that commits us to the operations */
2280 for (act = actions; act; act = act->next) {
2281 transaction_action(act->value, block_job_txn, tran, &local_err);
2282 if (local_err) {
2283 error_propagate(errp, local_err);
2284 goto delete_and_fail;
2285 }
2286 }
2287
2288 tran_commit(tran);
2289
2290 /* success */
2291 goto exit;
2292
2293 delete_and_fail:
2294 /* failure, and it is all-or-none; roll back all operations */
2295 tran_abort(tran);
2296 exit:
2297 job_txn_unref(block_job_txn);
2298 }
2299
2300 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2301 const char *name,
2302 Error **errp)
2303 {
2304 BdrvDirtyBitmap *bitmap;
2305 BlockDriverState *bs;
2306 BlockDirtyBitmapSha256 *ret = NULL;
2307 char *sha256;
2308
2309 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2310 if (!bitmap || !bs) {
2311 return NULL;
2312 }
2313
2314 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2315 if (sha256 == NULL) {
2316 return NULL;
2317 }
2318
2319 ret = g_new(BlockDirtyBitmapSha256, 1);
2320 ret->sha256 = sha256;
2321
2322 return ret;
2323 }
2324
2325 void coroutine_fn qmp_block_resize(const char *device, const char *node_name,
2326 int64_t size, Error **errp)
2327 {
2328 Error *local_err = NULL;
2329 BlockBackend *blk;
2330 BlockDriverState *bs;
2331 AioContext *old_ctx;
2332
2333 bs = bdrv_lookup_bs(device, node_name, &local_err);
2334 if (local_err) {
2335 error_propagate(errp, local_err);
2336 return;
2337 }
2338
2339 if (size < 0) {
2340 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2341 return;
2342 }
2343
2344 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2345 error_setg(errp, QERR_DEVICE_IN_USE, device);
2346 return;
2347 }
2348
2349 blk = blk_co_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp);
2350 if (!blk) {
2351 return;
2352 }
2353
2354 bdrv_co_lock(bs);
2355 bdrv_drained_begin(bs);
2356 bdrv_co_unlock(bs);
2357
2358 old_ctx = bdrv_co_enter(bs);
2359 blk_co_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp);
2360 bdrv_co_leave(bs, old_ctx);
2361
2362 bdrv_co_lock(bs);
2363 bdrv_drained_end(bs);
2364 blk_co_unref(blk);
2365 bdrv_co_unlock(bs);
2366 }
2367
2368 void qmp_block_stream(const char *job_id, const char *device,
2369 const char *base,
2370 const char *base_node,
2371 const char *backing_file,
2372 const char *bottom,
2373 bool has_speed, int64_t speed,
2374 bool has_on_error, BlockdevOnError on_error,
2375 const char *filter_node_name,
2376 bool has_auto_finalize, bool auto_finalize,
2377 bool has_auto_dismiss, bool auto_dismiss,
2378 Error **errp)
2379 {
2380 BlockDriverState *bs, *iter, *iter_end;
2381 BlockDriverState *base_bs = NULL;
2382 BlockDriverState *bottom_bs = NULL;
2383 AioContext *aio_context;
2384 Error *local_err = NULL;
2385 int job_flags = JOB_DEFAULT;
2386
2387 if (base && base_node) {
2388 error_setg(errp, "'base' and 'base-node' cannot be specified "
2389 "at the same time");
2390 return;
2391 }
2392
2393 if (base && bottom) {
2394 error_setg(errp, "'base' and 'bottom' cannot be specified "
2395 "at the same time");
2396 return;
2397 }
2398
2399 if (bottom && base_node) {
2400 error_setg(errp, "'bottom' and 'base-node' cannot be specified "
2401 "at the same time");
2402 return;
2403 }
2404
2405 if (!has_on_error) {
2406 on_error = BLOCKDEV_ON_ERROR_REPORT;
2407 }
2408
2409 bs = bdrv_lookup_bs(device, device, errp);
2410 if (!bs) {
2411 return;
2412 }
2413
2414 aio_context = bdrv_get_aio_context(bs);
2415 aio_context_acquire(aio_context);
2416
2417 if (base) {
2418 base_bs = bdrv_find_backing_image(bs, base);
2419 if (base_bs == NULL) {
2420 error_setg(errp, "Can't find '%s' in the backing chain", base);
2421 goto out;
2422 }
2423 assert(bdrv_get_aio_context(base_bs) == aio_context);
2424 }
2425
2426 if (base_node) {
2427 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2428 if (!base_bs) {
2429 goto out;
2430 }
2431 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
2432 error_setg(errp, "Node '%s' is not a backing image of '%s'",
2433 base_node, device);
2434 goto out;
2435 }
2436 assert(bdrv_get_aio_context(base_bs) == aio_context);
2437 bdrv_refresh_filename(base_bs);
2438 }
2439
2440 if (bottom) {
2441 bottom_bs = bdrv_lookup_bs(NULL, bottom, errp);
2442 if (!bottom_bs) {
2443 goto out;
2444 }
2445 if (!bottom_bs->drv) {
2446 error_setg(errp, "Node '%s' is not open", bottom);
2447 goto out;
2448 }
2449 if (bottom_bs->drv->is_filter) {
2450 error_setg(errp, "Node '%s' is a filter, use a non-filter node "
2451 "as 'bottom'", bottom);
2452 goto out;
2453 }
2454 if (!bdrv_chain_contains(bs, bottom_bs)) {
2455 error_setg(errp, "Node '%s' is not in a chain starting from '%s'",
2456 bottom, device);
2457 goto out;
2458 }
2459 assert(bdrv_get_aio_context(bottom_bs) == aio_context);
2460 }
2461
2462 /*
2463 * Check for op blockers in the whole chain between bs and base (or bottom)
2464 */
2465 iter_end = bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs;
2466 for (iter = bs; iter && iter != iter_end;
2467 iter = bdrv_filter_or_cow_bs(iter))
2468 {
2469 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
2470 goto out;
2471 }
2472 }
2473
2474 /* if we are streaming the entire chain, the result will have no backing
2475 * file, and specifying one is therefore an error */
2476 if (!base_bs && backing_file) {
2477 error_setg(errp, "backing file specified, but streaming the "
2478 "entire chain");
2479 goto out;
2480 }
2481
2482 if (has_auto_finalize && !auto_finalize) {
2483 job_flags |= JOB_MANUAL_FINALIZE;
2484 }
2485 if (has_auto_dismiss && !auto_dismiss) {
2486 job_flags |= JOB_MANUAL_DISMISS;
2487 }
2488
2489 stream_start(job_id, bs, base_bs, backing_file,
2490 bottom_bs, job_flags, has_speed ? speed : 0, on_error,
2491 filter_node_name, &local_err);
2492 if (local_err) {
2493 error_propagate(errp, local_err);
2494 goto out;
2495 }
2496
2497 trace_qmp_block_stream(bs);
2498
2499 out:
2500 aio_context_release(aio_context);
2501 }
2502
2503 void qmp_block_commit(const char *job_id, const char *device,
2504 const char *base_node,
2505 const char *base,
2506 const char *top_node,
2507 const char *top,
2508 const char *backing_file,
2509 bool has_speed, int64_t speed,
2510 bool has_on_error, BlockdevOnError on_error,
2511 const char *filter_node_name,
2512 bool has_auto_finalize, bool auto_finalize,
2513 bool has_auto_dismiss, bool auto_dismiss,
2514 Error **errp)
2515 {
2516 BlockDriverState *bs;
2517 BlockDriverState *iter;
2518 BlockDriverState *base_bs, *top_bs;
2519 AioContext *aio_context;
2520 Error *local_err = NULL;
2521 int job_flags = JOB_DEFAULT;
2522 uint64_t top_perm, top_shared;
2523
2524 if (!has_speed) {
2525 speed = 0;
2526 }
2527 if (!has_on_error) {
2528 on_error = BLOCKDEV_ON_ERROR_REPORT;
2529 }
2530 if (has_auto_finalize && !auto_finalize) {
2531 job_flags |= JOB_MANUAL_FINALIZE;
2532 }
2533 if (has_auto_dismiss && !auto_dismiss) {
2534 job_flags |= JOB_MANUAL_DISMISS;
2535 }
2536
2537 /* Important Note:
2538 * libvirt relies on the DeviceNotFound error class in order to probe for
2539 * live commit feature versions; for this to work, we must make sure to
2540 * perform the device lookup before any generic errors that may occur in a
2541 * scenario in which all optional arguments are omitted. */
2542 bs = qmp_get_root_bs(device, &local_err);
2543 if (!bs) {
2544 bs = bdrv_lookup_bs(device, device, NULL);
2545 if (!bs) {
2546 error_free(local_err);
2547 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2548 "Device '%s' not found", device);
2549 } else {
2550 error_propagate(errp, local_err);
2551 }
2552 return;
2553 }
2554
2555 aio_context = bdrv_get_aio_context(bs);
2556 aio_context_acquire(aio_context);
2557
2558 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2559 goto out;
2560 }
2561
2562 /* default top_bs is the active layer */
2563 top_bs = bs;
2564
2565 if (top_node && top) {
2566 error_setg(errp, "'top-node' and 'top' are mutually exclusive");
2567 goto out;
2568 } else if (top_node) {
2569 top_bs = bdrv_lookup_bs(NULL, top_node, errp);
2570 if (top_bs == NULL) {
2571 goto out;
2572 }
2573 if (!bdrv_chain_contains(bs, top_bs)) {
2574 error_setg(errp, "'%s' is not in this backing file chain",
2575 top_node);
2576 goto out;
2577 }
2578 } else if (top) {
2579 /* This strcmp() is just a shortcut, there is no need to
2580 * refresh @bs's filename. If it mismatches,
2581 * bdrv_find_backing_image() will do the refresh and may still
2582 * return @bs. */
2583 if (strcmp(bs->filename, top) != 0) {
2584 top_bs = bdrv_find_backing_image(bs, top);
2585 }
2586 }
2587
2588 if (top_bs == NULL) {
2589 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2590 goto out;
2591 }
2592
2593 assert(bdrv_get_aio_context(top_bs) == aio_context);
2594
2595 if (base_node && base) {
2596 error_setg(errp, "'base-node' and 'base' are mutually exclusive");
2597 goto out;
2598 } else if (base_node) {
2599 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2600 if (base_bs == NULL) {
2601 goto out;
2602 }
2603 if (!bdrv_chain_contains(top_bs, base_bs)) {
2604 error_setg(errp, "'%s' is not in this backing file chain",
2605 base_node);
2606 goto out;
2607 }
2608 } else if (base) {
2609 base_bs = bdrv_find_backing_image(top_bs, base);
2610 if (base_bs == NULL) {
2611 error_setg(errp, "Can't find '%s' in the backing chain", base);
2612 goto out;
2613 }
2614 } else {
2615 base_bs = bdrv_find_base(top_bs);
2616 if (base_bs == NULL) {
2617 error_setg(errp, "There is no backimg image");
2618 goto out;
2619 }
2620 }
2621
2622 assert(bdrv_get_aio_context(base_bs) == aio_context);
2623
2624 for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs);
2625 iter = bdrv_filter_or_cow_bs(iter))
2626 {
2627 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2628 goto out;
2629 }
2630 }
2631
2632 /* Do not allow attempts to commit an image into itself */
2633 if (top_bs == base_bs) {
2634 error_setg(errp, "cannot commit an image into itself");
2635 goto out;
2636 }
2637
2638 /*
2639 * Active commit is required if and only if someone has taken a
2640 * WRITE permission on the top node. Historically, we have always
2641 * used active commit for top nodes, so continue that practice
2642 * lest we possibly break clients that rely on this behavior, e.g.
2643 * to later attach this node to a writing parent.
2644 * (Active commit is never really wrong.)
2645 */
2646 bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared);
2647 if (top_perm & BLK_PERM_WRITE ||
2648 bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs))
2649 {
2650 if (backing_file) {
2651 if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) {
2652 error_setg(errp, "'backing-file' specified,"
2653 " but 'top' is the active layer");
2654 } else {
2655 error_setg(errp, "'backing-file' specified, but 'top' has a "
2656 "writer on it");
2657 }
2658 goto out;
2659 }
2660 if (!job_id) {
2661 /*
2662 * Emulate here what block_job_create() does, because it
2663 * is possible that @bs != @top_bs (the block job should
2664 * be named after @bs, even if @top_bs is the actual
2665 * source)
2666 */
2667 job_id = bdrv_get_device_name(bs);
2668 }
2669 commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error,
2670 filter_node_name, NULL, NULL, false, &local_err);
2671 } else {
2672 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
2673 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2674 goto out;
2675 }
2676 commit_start(job_id, bs, base_bs, top_bs, job_flags,
2677 speed, on_error, backing_file,
2678 filter_node_name, &local_err);
2679 }
2680 if (local_err != NULL) {
2681 error_propagate(errp, local_err);
2682 goto out;
2683 }
2684
2685 out:
2686 aio_context_release(aio_context);
2687 }
2688
2689 /* Common QMP interface for drive-backup and blockdev-backup */
2690 static BlockJob *do_backup_common(BackupCommon *backup,
2691 BlockDriverState *bs,
2692 BlockDriverState *target_bs,
2693 AioContext *aio_context,
2694 JobTxn *txn, Error **errp)
2695 {
2696 BlockJob *job = NULL;
2697 BdrvDirtyBitmap *bmap = NULL;
2698 BackupPerf perf = { .max_workers = 64 };
2699 int job_flags = JOB_DEFAULT;
2700
2701 if (!backup->has_speed) {
2702 backup->speed = 0;
2703 }
2704 if (!backup->has_on_source_error) {
2705 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2706 }
2707 if (!backup->has_on_target_error) {
2708 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2709 }
2710 if (!backup->has_auto_finalize) {
2711 backup->auto_finalize = true;
2712 }
2713 if (!backup->has_auto_dismiss) {
2714 backup->auto_dismiss = true;
2715 }
2716 if (!backup->has_compress) {
2717 backup->compress = false;
2718 }
2719
2720 if (backup->x_perf) {
2721 if (backup->x_perf->has_use_copy_range) {
2722 perf.use_copy_range = backup->x_perf->use_copy_range;
2723 }
2724 if (backup->x_perf->has_max_workers) {
2725 perf.max_workers = backup->x_perf->max_workers;
2726 }
2727 if (backup->x_perf->has_max_chunk) {
2728 perf.max_chunk = backup->x_perf->max_chunk;
2729 }
2730 }
2731
2732 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) ||
2733 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) {
2734 /* done before desugaring 'incremental' to print the right message */
2735 if (!backup->bitmap) {
2736 error_setg(errp, "must provide a valid bitmap name for "
2737 "'%s' sync mode", MirrorSyncMode_str(backup->sync));
2738 return NULL;
2739 }
2740 }
2741
2742 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) {
2743 if (backup->has_bitmap_mode &&
2744 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) {
2745 error_setg(errp, "Bitmap sync mode must be '%s' "
2746 "when using sync mode '%s'",
2747 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS),
2748 MirrorSyncMode_str(backup->sync));
2749 return NULL;
2750 }
2751 backup->has_bitmap_mode = true;
2752 backup->sync = MIRROR_SYNC_MODE_BITMAP;
2753 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS;
2754 }
2755
2756 if (backup->bitmap) {
2757 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
2758 if (!bmap) {
2759 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
2760 return NULL;
2761 }
2762 if (!backup->has_bitmap_mode) {
2763 error_setg(errp, "Bitmap sync mode must be given "
2764 "when providing a bitmap");
2765 return NULL;
2766 }
2767 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2768 return NULL;
2769 }
2770
2771 /* This does not produce a useful bitmap artifact: */
2772 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
2773 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap"
2774 " outputs", MirrorSyncMode_str(backup->sync));
2775 return NULL;
2776 }
2777
2778 /* If the bitmap isn't used for input or output, this is useless: */
2779 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER &&
2780 backup->sync != MIRROR_SYNC_MODE_BITMAP) {
2781 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect"
2782 " when combined with sync mode '%s'",
2783 BitmapSyncMode_str(backup->bitmap_mode),
2784 MirrorSyncMode_str(backup->sync));
2785 return NULL;
2786 }
2787 }
2788
2789 if (!backup->bitmap && backup->has_bitmap_mode) {
2790 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap");
2791 return NULL;
2792 }
2793
2794 if (!backup->auto_finalize) {
2795 job_flags |= JOB_MANUAL_FINALIZE;
2796 }
2797 if (!backup->auto_dismiss) {
2798 job_flags |= JOB_MANUAL_DISMISS;
2799 }
2800
2801 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
2802 backup->sync, bmap, backup->bitmap_mode,
2803 backup->compress,
2804 backup->filter_node_name,
2805 &perf,
2806 backup->on_source_error,
2807 backup->on_target_error,
2808 job_flags, NULL, NULL, txn, errp);
2809 return job;
2810 }
2811
2812 void qmp_drive_backup(DriveBackup *backup, Error **errp)
2813 {
2814 TransactionAction action = {
2815 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP,
2816 .u.drive_backup.data = backup,
2817 };
2818 blockdev_do_action(&action, errp);
2819 }
2820
2821 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat,
2822 bool flat,
2823 Error **errp)
2824 {
2825 bool return_flat = has_flat && flat;
2826
2827 return bdrv_named_nodes_list(return_flat, errp);
2828 }
2829
2830 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
2831 {
2832 return bdrv_get_xdbg_block_graph(errp);
2833 }
2834
2835 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp)
2836 {
2837 TransactionAction action = {
2838 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP,
2839 .u.blockdev_backup.data = backup,
2840 };
2841 blockdev_do_action(&action, errp);
2842 }
2843
2844 /* Parameter check and block job starting for drive mirroring.
2845 * Caller should hold @device and @target's aio context (must be the same).
2846 **/
2847 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
2848 BlockDriverState *target,
2849 const char *replaces,
2850 enum MirrorSyncMode sync,
2851 BlockMirrorBackingMode backing_mode,
2852 bool zero_target,
2853 bool has_speed, int64_t speed,
2854 bool has_granularity, uint32_t granularity,
2855 bool has_buf_size, int64_t buf_size,
2856 bool has_on_source_error,
2857 BlockdevOnError on_source_error,
2858 bool has_on_target_error,
2859 BlockdevOnError on_target_error,
2860 bool has_unmap, bool unmap,
2861 const char *filter_node_name,
2862 bool has_copy_mode, MirrorCopyMode copy_mode,
2863 bool has_auto_finalize, bool auto_finalize,
2864 bool has_auto_dismiss, bool auto_dismiss,
2865 Error **errp)
2866 {
2867 BlockDriverState *unfiltered_bs;
2868 int job_flags = JOB_DEFAULT;
2869
2870 GLOBAL_STATE_CODE();
2871 GRAPH_RDLOCK_GUARD_MAINLOOP();
2872
2873 if (!has_speed) {
2874 speed = 0;
2875 }
2876 if (!has_on_source_error) {
2877 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2878 }
2879 if (!has_on_target_error) {
2880 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2881 }
2882 if (!has_granularity) {
2883 granularity = 0;
2884 }
2885 if (!has_buf_size) {
2886 buf_size = 0;
2887 }
2888 if (!has_unmap) {
2889 unmap = true;
2890 }
2891 if (!has_copy_mode) {
2892 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
2893 }
2894 if (has_auto_finalize && !auto_finalize) {
2895 job_flags |= JOB_MANUAL_FINALIZE;
2896 }
2897 if (has_auto_dismiss && !auto_dismiss) {
2898 job_flags |= JOB_MANUAL_DISMISS;
2899 }
2900
2901 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2902 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2903 "a value in range [512B, 64MB]");
2904 return;
2905 }
2906 if (granularity & (granularity - 1)) {
2907 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2908 "a power of 2");
2909 return;
2910 }
2911
2912 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
2913 return;
2914 }
2915 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
2916 return;
2917 }
2918
2919 if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) {
2920 sync = MIRROR_SYNC_MODE_FULL;
2921 }
2922
2923 if (!replaces) {
2924 /* We want to mirror from @bs, but keep implicit filters on top */
2925 unfiltered_bs = bdrv_skip_implicit_filters(bs);
2926 if (unfiltered_bs != bs) {
2927 replaces = unfiltered_bs->node_name;
2928 }
2929 }
2930
2931 if (replaces) {
2932 BlockDriverState *to_replace_bs;
2933 AioContext *replace_aio_context;
2934 int64_t bs_size, replace_size;
2935
2936 bs_size = bdrv_getlength(bs);
2937 if (bs_size < 0) {
2938 error_setg_errno(errp, -bs_size, "Failed to query device's size");
2939 return;
2940 }
2941
2942 to_replace_bs = check_to_replace_node(bs, replaces, errp);
2943 if (!to_replace_bs) {
2944 return;
2945 }
2946
2947 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
2948 aio_context_acquire(replace_aio_context);
2949 replace_size = bdrv_getlength(to_replace_bs);
2950 aio_context_release(replace_aio_context);
2951
2952 if (replace_size < 0) {
2953 error_setg_errno(errp, -replace_size,
2954 "Failed to query the replacement node's size");
2955 return;
2956 }
2957 if (bs_size != replace_size) {
2958 error_setg(errp, "cannot replace image with a mirror image of "
2959 "different size");
2960 return;
2961 }
2962 }
2963
2964 /* pass the node name to replace to mirror start since it's loose coupling
2965 * and will allow to check whether the node still exist at mirror completion
2966 */
2967 mirror_start(job_id, bs, target,
2968 replaces, job_flags,
2969 speed, granularity, buf_size, sync, backing_mode, zero_target,
2970 on_source_error, on_target_error, unmap, filter_node_name,
2971 copy_mode, errp);
2972 }
2973
2974 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
2975 {
2976 BlockDriverState *bs;
2977 BlockDriverState *target_backing_bs, *target_bs;
2978 AioContext *aio_context;
2979 AioContext *old_context;
2980 BlockMirrorBackingMode backing_mode;
2981 Error *local_err = NULL;
2982 QDict *options = NULL;
2983 int flags;
2984 int64_t size;
2985 const char *format = arg->format;
2986 bool zero_target;
2987 int ret;
2988
2989 bs = qmp_get_root_bs(arg->device, errp);
2990 if (!bs) {
2991 return;
2992 }
2993
2994 /* Early check to avoid creating target */
2995 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
2996 return;
2997 }
2998
2999 aio_context = bdrv_get_aio_context(bs);
3000 aio_context_acquire(aio_context);
3001
3002 if (!arg->has_mode) {
3003 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3004 }
3005
3006 if (!arg->format) {
3007 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3008 ? NULL : bs->drv->format_name);
3009 }
3010
3011 flags = bs->open_flags | BDRV_O_RDWR;
3012 target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs));
3013 if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) {
3014 arg->sync = MIRROR_SYNC_MODE_FULL;
3015 }
3016 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3017 target_backing_bs = bs;
3018 }
3019
3020 size = bdrv_getlength(bs);
3021 if (size < 0) {
3022 error_setg_errno(errp, -size, "bdrv_getlength failed");
3023 goto out;
3024 }
3025
3026 if (arg->replaces) {
3027 if (!arg->node_name) {
3028 error_setg(errp, "a node-name must be provided when replacing a"
3029 " named node of the graph");
3030 goto out;
3031 }
3032 }
3033
3034 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3035 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3036 } else {
3037 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3038 }
3039
3040 /* Don't open backing image in create() */
3041 flags |= BDRV_O_NO_BACKING;
3042
3043 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs)
3044 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3045 {
3046 /* create new image w/o backing file */
3047 assert(format);
3048 bdrv_img_create(arg->target, format,
3049 NULL, NULL, NULL, size, flags, false, &local_err);
3050 } else {
3051 /* Implicit filters should not appear in the filename */
3052 BlockDriverState *explicit_backing =
3053 bdrv_skip_implicit_filters(target_backing_bs);
3054
3055 switch (arg->mode) {
3056 case NEW_IMAGE_MODE_EXISTING:
3057 break;
3058 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3059 /* create new image with backing file */
3060 bdrv_refresh_filename(explicit_backing);
3061 bdrv_img_create(arg->target, format,
3062 explicit_backing->filename,
3063 explicit_backing->drv->format_name,
3064 NULL, size, flags, false, &local_err);
3065 break;
3066 default:
3067 abort();
3068 }
3069 }
3070
3071 if (local_err) {
3072 error_propagate(errp, local_err);
3073 goto out;
3074 }
3075
3076 options = qdict_new();
3077 if (arg->node_name) {
3078 qdict_put_str(options, "node-name", arg->node_name);
3079 }
3080 if (format) {
3081 qdict_put_str(options, "driver", format);
3082 }
3083 aio_context_release(aio_context);
3084
3085 /* Mirroring takes care of copy-on-write using the source's backing
3086 * file.
3087 */
3088 aio_context_acquire(qemu_get_aio_context());
3089 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3090 aio_context_release(qemu_get_aio_context());
3091
3092 if (!target_bs) {
3093 return;
3094 }
3095
3096 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL &&
3097 (arg->mode == NEW_IMAGE_MODE_EXISTING ||
3098 !bdrv_has_zero_init(target_bs)));
3099
3100
3101 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */
3102 old_context = bdrv_get_aio_context(target_bs);
3103 aio_context_acquire(old_context);
3104
3105 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
3106 if (ret < 0) {
3107 bdrv_unref(target_bs);
3108 aio_context_release(old_context);
3109 return;
3110 }
3111
3112 aio_context_release(old_context);
3113 aio_context_acquire(aio_context);
3114
3115 blockdev_mirror_common(arg->job_id, bs, target_bs,
3116 arg->replaces, arg->sync,
3117 backing_mode, zero_target,
3118 arg->has_speed, arg->speed,
3119 arg->has_granularity, arg->granularity,
3120 arg->has_buf_size, arg->buf_size,
3121 arg->has_on_source_error, arg->on_source_error,
3122 arg->has_on_target_error, arg->on_target_error,
3123 arg->has_unmap, arg->unmap,
3124 NULL,
3125 arg->has_copy_mode, arg->copy_mode,
3126 arg->has_auto_finalize, arg->auto_finalize,
3127 arg->has_auto_dismiss, arg->auto_dismiss,
3128 errp);
3129 bdrv_unref(target_bs);
3130 out:
3131 aio_context_release(aio_context);
3132 }
3133
3134 void qmp_blockdev_mirror(const char *job_id,
3135 const char *device, const char *target,
3136 const char *replaces,
3137 MirrorSyncMode sync,
3138 bool has_speed, int64_t speed,
3139 bool has_granularity, uint32_t granularity,
3140 bool has_buf_size, int64_t buf_size,
3141 bool has_on_source_error,
3142 BlockdevOnError on_source_error,
3143 bool has_on_target_error,
3144 BlockdevOnError on_target_error,
3145 const char *filter_node_name,
3146 bool has_copy_mode, MirrorCopyMode copy_mode,
3147 bool has_auto_finalize, bool auto_finalize,
3148 bool has_auto_dismiss, bool auto_dismiss,
3149 Error **errp)
3150 {
3151 BlockDriverState *bs;
3152 BlockDriverState *target_bs;
3153 AioContext *aio_context;
3154 AioContext *old_context;
3155 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3156 bool zero_target;
3157 int ret;
3158
3159 bs = qmp_get_root_bs(device, errp);
3160 if (!bs) {
3161 return;
3162 }
3163
3164 target_bs = bdrv_lookup_bs(target, target, errp);
3165 if (!target_bs) {
3166 return;
3167 }
3168
3169 zero_target = (sync == MIRROR_SYNC_MODE_FULL);
3170
3171 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */
3172 old_context = bdrv_get_aio_context(target_bs);
3173 aio_context = bdrv_get_aio_context(bs);
3174 aio_context_acquire(old_context);
3175
3176 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
3177
3178 aio_context_release(old_context);
3179 aio_context_acquire(aio_context);
3180
3181 if (ret < 0) {
3182 goto out;
3183 }
3184
3185 blockdev_mirror_common(job_id, bs, target_bs,
3186 replaces, sync, backing_mode,
3187 zero_target, has_speed, speed,
3188 has_granularity, granularity,
3189 has_buf_size, buf_size,
3190 has_on_source_error, on_source_error,
3191 has_on_target_error, on_target_error,
3192 true, true, filter_node_name,
3193 has_copy_mode, copy_mode,
3194 has_auto_finalize, auto_finalize,
3195 has_auto_dismiss, auto_dismiss,
3196 errp);
3197 out:
3198 aio_context_release(aio_context);
3199 }
3200
3201 /*
3202 * Get a block job using its ID. Called with job_mutex held.
3203 */
3204 static BlockJob *find_block_job_locked(const char *id, Error **errp)
3205 {
3206 BlockJob *job;
3207
3208 assert(id != NULL);
3209
3210 job = block_job_get_locked(id);
3211
3212 if (!job) {
3213 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3214 "Block job '%s' not found", id);
3215 return NULL;
3216 }
3217
3218 return job;
3219 }
3220
3221 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3222 {
3223 BlockJob *job;
3224
3225 JOB_LOCK_GUARD();
3226 job = find_block_job_locked(device, errp);
3227
3228 if (!job) {
3229 return;
3230 }
3231
3232 block_job_set_speed_locked(job, speed, errp);
3233 }
3234
3235 void qmp_block_job_cancel(const char *device,
3236 bool has_force, bool force, Error **errp)
3237 {
3238 BlockJob *job;
3239
3240 JOB_LOCK_GUARD();
3241 job = find_block_job_locked(device, errp);
3242
3243 if (!job) {
3244 return;
3245 }
3246
3247 if (!has_force) {
3248 force = false;
3249 }
3250
3251 if (job_user_paused_locked(&job->job) && !force) {
3252 error_setg(errp, "The block job for device '%s' is currently paused",
3253 device);
3254 return;
3255 }
3256
3257 trace_qmp_block_job_cancel(job);
3258 job_user_cancel_locked(&job->job, force, errp);
3259 }
3260
3261 void qmp_block_job_pause(const char *device, Error **errp)
3262 {
3263 BlockJob *job;
3264
3265 JOB_LOCK_GUARD();
3266 job = find_block_job_locked(device, errp);
3267
3268 if (!job) {
3269 return;
3270 }
3271
3272 trace_qmp_block_job_pause(job);
3273 job_user_pause_locked(&job->job, errp);
3274 }
3275
3276 void qmp_block_job_resume(const char *device, Error **errp)
3277 {
3278 BlockJob *job;
3279
3280 JOB_LOCK_GUARD();
3281 job = find_block_job_locked(device, errp);
3282
3283 if (!job) {
3284 return;
3285 }
3286
3287 trace_qmp_block_job_resume(job);
3288 job_user_resume_locked(&job->job, errp);
3289 }
3290
3291 void qmp_block_job_complete(const char *device, Error **errp)
3292 {
3293 BlockJob *job;
3294
3295 JOB_LOCK_GUARD();
3296 job = find_block_job_locked(device, errp);
3297
3298 if (!job) {
3299 return;
3300 }
3301
3302 trace_qmp_block_job_complete(job);
3303 job_complete_locked(&job->job, errp);
3304 }
3305
3306 void qmp_block_job_finalize(const char *id, Error **errp)
3307 {
3308 BlockJob *job;
3309
3310 JOB_LOCK_GUARD();
3311 job = find_block_job_locked(id, errp);
3312
3313 if (!job) {
3314 return;
3315 }
3316
3317 trace_qmp_block_job_finalize(job);
3318 job_ref_locked(&job->job);
3319 job_finalize_locked(&job->job, errp);
3320
3321 job_unref_locked(&job->job);
3322 }
3323
3324 void qmp_block_job_dismiss(const char *id, Error **errp)
3325 {
3326 BlockJob *bjob;
3327 Job *job;
3328
3329 JOB_LOCK_GUARD();
3330 bjob = find_block_job_locked(id, errp);
3331
3332 if (!bjob) {
3333 return;
3334 }
3335
3336 trace_qmp_block_job_dismiss(bjob);
3337 job = &bjob->job;
3338 job_dismiss_locked(&job, errp);
3339 }
3340
3341 void qmp_change_backing_file(const char *device,
3342 const char *image_node_name,
3343 const char *backing_file,
3344 Error **errp)
3345 {
3346 BlockDriverState *bs = NULL;
3347 AioContext *aio_context;
3348 BlockDriverState *image_bs = NULL;
3349 Error *local_err = NULL;
3350 bool ro;
3351 int ret;
3352
3353 bs = qmp_get_root_bs(device, errp);
3354 if (!bs) {
3355 return;
3356 }
3357
3358 aio_context = bdrv_get_aio_context(bs);
3359 aio_context_acquire(aio_context);
3360
3361 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3362 if (local_err) {
3363 error_propagate(errp, local_err);
3364 goto out;
3365 }
3366
3367 if (!image_bs) {
3368 error_setg(errp, "image file not found");
3369 goto out;
3370 }
3371
3372 if (bdrv_find_base(image_bs) == image_bs) {
3373 error_setg(errp, "not allowing backing file change on an image "
3374 "without a backing file");
3375 goto out;
3376 }
3377
3378 /* even though we are not necessarily operating on bs, we need it to
3379 * determine if block ops are currently prohibited on the chain */
3380 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3381 goto out;
3382 }
3383
3384 /* final sanity check */
3385 if (!bdrv_chain_contains(bs, image_bs)) {
3386 error_setg(errp, "'%s' and image file are not in the same chain",
3387 device);
3388 goto out;
3389 }
3390
3391 /* if not r/w, reopen to make r/w */
3392 ro = bdrv_is_read_only(image_bs);
3393
3394 if (ro) {
3395 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) {
3396 goto out;
3397 }
3398 }
3399
3400 ret = bdrv_change_backing_file(image_bs, backing_file,
3401 image_bs->drv ? image_bs->drv->format_name : "",
3402 false);
3403
3404 if (ret < 0) {
3405 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3406 backing_file);
3407 /* don't exit here, so we can try to restore open flags if
3408 * appropriate */
3409 }
3410
3411 if (ro) {
3412 bdrv_reopen_set_read_only(image_bs, true, errp);
3413 }
3414
3415 out:
3416 aio_context_release(aio_context);
3417 }
3418
3419 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3420 {
3421 BlockDriverState *bs;
3422 QObject *obj;
3423 Visitor *v = qobject_output_visitor_new(&obj);
3424 QDict *qdict;
3425
3426 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3427 visit_complete(v, &obj);
3428 qdict = qobject_to(QDict, obj);
3429
3430 qdict_flatten(qdict);
3431
3432 if (!qdict_get_try_str(qdict, "node-name")) {
3433 error_setg(errp, "'node-name' must be specified for the root node");
3434 goto fail;
3435 }
3436
3437 bs = bds_tree_init(qdict, errp);
3438 if (!bs) {
3439 goto fail;
3440 }
3441
3442 bdrv_set_monitor_owned(bs);
3443
3444 fail:
3445 visit_free(v);
3446 }
3447
3448 void qmp_blockdev_reopen(BlockdevOptionsList *reopen_list, Error **errp)
3449 {
3450 BlockReopenQueue *queue = NULL;
3451
3452 /* Add each one of the BDS that we want to reopen to the queue */
3453 for (; reopen_list != NULL; reopen_list = reopen_list->next) {
3454 BlockdevOptions *options = reopen_list->value;
3455 BlockDriverState *bs;
3456 AioContext *ctx;
3457 QObject *obj;
3458 Visitor *v;
3459 QDict *qdict;
3460
3461 /* Check for the selected node name */
3462 if (!options->node_name) {
3463 error_setg(errp, "node-name not specified");
3464 goto fail;
3465 }
3466
3467 bs = bdrv_find_node(options->node_name);
3468 if (!bs) {
3469 error_setg(errp, "Failed to find node with node-name='%s'",
3470 options->node_name);
3471 goto fail;
3472 }
3473
3474 /* Put all options in a QDict and flatten it */
3475 v = qobject_output_visitor_new(&obj);
3476 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3477 visit_complete(v, &obj);
3478 visit_free(v);
3479
3480 qdict = qobject_to(QDict, obj);
3481
3482 qdict_flatten(qdict);
3483
3484 ctx = bdrv_get_aio_context(bs);
3485 aio_context_acquire(ctx);
3486
3487 queue = bdrv_reopen_queue(queue, bs, qdict, false);
3488
3489 aio_context_release(ctx);
3490 }
3491
3492 /* Perform the reopen operation */
3493 bdrv_reopen_multiple(queue, errp);
3494 queue = NULL;
3495
3496 fail:
3497 bdrv_reopen_queue_free(queue);
3498 }
3499
3500 void qmp_blockdev_del(const char *node_name, Error **errp)
3501 {
3502 AioContext *aio_context;
3503 BlockDriverState *bs;
3504
3505 GLOBAL_STATE_CODE();
3506
3507 bs = bdrv_find_node(node_name);
3508 if (!bs) {
3509 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3510 return;
3511 }
3512 if (bdrv_has_blk(bs)) {
3513 error_setg(errp, "Node %s is in use", node_name);
3514 return;
3515 }
3516 aio_context = bdrv_get_aio_context(bs);
3517 aio_context_acquire(aio_context);
3518
3519 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
3520 goto out;
3521 }
3522
3523 if (!QTAILQ_IN_USE(bs, monitor_list)) {
3524 error_setg(errp, "Node %s is not owned by the monitor",
3525 bs->node_name);
3526 goto out;
3527 }
3528
3529 if (bs->refcnt > 1) {
3530 error_setg(errp, "Block device %s is in use",
3531 bdrv_get_device_or_node_name(bs));
3532 goto out;
3533 }
3534
3535 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3536 bdrv_unref(bs);
3537
3538 out:
3539 aio_context_release(aio_context);
3540 }
3541
3542 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
3543 const char *child_name)
3544 {
3545 BdrvChild *child;
3546
3547 QLIST_FOREACH(child, &parent_bs->children, next) {
3548 if (strcmp(child->name, child_name) == 0) {
3549 return child;
3550 }
3551 }
3552
3553 return NULL;
3554 }
3555
3556 void qmp_x_blockdev_change(const char *parent, const char *child,
3557 const char *node, Error **errp)
3558 {
3559 BlockDriverState *parent_bs, *new_bs = NULL;
3560 BdrvChild *p_child;
3561
3562 parent_bs = bdrv_lookup_bs(parent, parent, errp);
3563 if (!parent_bs) {
3564 return;
3565 }
3566
3567 if (!child == !node) {
3568 if (child) {
3569 error_setg(errp, "The parameters child and node are in conflict");
3570 } else {
3571 error_setg(errp, "Either child or node must be specified");
3572 }
3573 return;
3574 }
3575
3576 if (child) {
3577 p_child = bdrv_find_child(parent_bs, child);
3578 if (!p_child) {
3579 error_setg(errp, "Node '%s' does not have child '%s'",
3580 parent, child);
3581 return;
3582 }
3583 bdrv_del_child(parent_bs, p_child, errp);
3584 }
3585
3586 if (node) {
3587 new_bs = bdrv_find_node(node);
3588 if (!new_bs) {
3589 error_setg(errp, "Node '%s' not found", node);
3590 return;
3591 }
3592 bdrv_add_child(parent_bs, new_bs, errp);
3593 }
3594 }
3595
3596 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3597 {
3598 BlockJobInfoList *head = NULL, **tail = &head;
3599 BlockJob *job;
3600
3601 JOB_LOCK_GUARD();
3602
3603 for (job = block_job_next_locked(NULL); job;
3604 job = block_job_next_locked(job)) {
3605 BlockJobInfo *value;
3606
3607 if (block_job_is_internal(job)) {
3608 continue;
3609 }
3610 value = block_job_query_locked(job, errp);
3611 if (!value) {
3612 qapi_free_BlockJobInfoList(head);
3613 return NULL;
3614 }
3615 QAPI_LIST_APPEND(tail, value);
3616 }
3617
3618 return head;
3619 }
3620
3621 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
3622 bool has_force, bool force, Error **errp)
3623 {
3624 AioContext *old_context;
3625 AioContext *new_context;
3626 BlockDriverState *bs;
3627
3628 bs = bdrv_find_node(node_name);
3629 if (!bs) {
3630 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3631 return;
3632 }
3633
3634 /* Protects against accidents. */
3635 if (!(has_force && force) && bdrv_has_blk(bs)) {
3636 error_setg(errp, "Node %s is associated with a BlockBackend and could "
3637 "be in use (use force=true to override this check)",
3638 node_name);
3639 return;
3640 }
3641
3642 if (iothread->type == QTYPE_QSTRING) {
3643 IOThread *obj = iothread_by_id(iothread->u.s);
3644 if (!obj) {
3645 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
3646 return;
3647 }
3648
3649 new_context = iothread_get_aio_context(obj);
3650 } else {
3651 new_context = qemu_get_aio_context();
3652 }
3653
3654 old_context = bdrv_get_aio_context(bs);
3655 aio_context_acquire(old_context);
3656
3657 bdrv_try_change_aio_context(bs, new_context, NULL, errp);
3658
3659 aio_context_release(old_context);
3660 }
3661
3662 QemuOptsList qemu_common_drive_opts = {
3663 .name = "drive",
3664 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3665 .desc = {
3666 {
3667 .name = "snapshot",
3668 .type = QEMU_OPT_BOOL,
3669 .help = "enable/disable snapshot mode",
3670 },{
3671 .name = "aio",
3672 .type = QEMU_OPT_STRING,
3673 .help = "host AIO implementation (threads, native, io_uring)",
3674 },{
3675 .name = BDRV_OPT_CACHE_WB,
3676 .type = QEMU_OPT_BOOL,
3677 .help = "Enable writeback mode",
3678 },{
3679 .name = "format",
3680 .type = QEMU_OPT_STRING,
3681 .help = "disk format (raw, qcow2, ...)",
3682 },{
3683 .name = "rerror",
3684 .type = QEMU_OPT_STRING,
3685 .help = "read error action",
3686 },{
3687 .name = "werror",
3688 .type = QEMU_OPT_STRING,
3689 .help = "write error action",
3690 },{
3691 .name = BDRV_OPT_READ_ONLY,
3692 .type = QEMU_OPT_BOOL,
3693 .help = "open drive file as read-only",
3694 },
3695
3696 THROTTLE_OPTS,
3697
3698 {
3699 .name = "throttling.group",
3700 .type = QEMU_OPT_STRING,
3701 .help = "name of the block throttling group",
3702 },{
3703 .name = "copy-on-read",
3704 .type = QEMU_OPT_BOOL,
3705 .help = "copy read data from backing file into image file",
3706 },{
3707 .name = "detect-zeroes",
3708 .type = QEMU_OPT_STRING,
3709 .help = "try to optimize zero writes (off, on, unmap)",
3710 },{
3711 .name = "stats-account-invalid",
3712 .type = QEMU_OPT_BOOL,
3713 .help = "whether to account for invalid I/O operations "
3714 "in the statistics",
3715 },{
3716 .name = "stats-account-failed",
3717 .type = QEMU_OPT_BOOL,
3718 .help = "whether to account for failed I/O operations "
3719 "in the statistics",
3720 },
3721 { /* end of list */ }
3722 },
3723 };
3724
3725 QemuOptsList qemu_drive_opts = {
3726 .name = "drive",
3727 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3728 .desc = {
3729 /*
3730 * no elements => accept any params
3731 * validation will happen later
3732 */
3733 { /* end of list */ }
3734 },
3735 };
armbru's QEMU hackery