2 * QEMU host block devices
4 * Copyright (c) 2003-2008 Fabrice Bellard
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.
9 * This file incorporates work covered by the following copyright and
12 * Copyright (c) 2003-2008 Fabrice Bellard
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:
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
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
33 #include "qemu/osdep.h"
34 #include "sysemu/block-backend.h"
35 #include "sysemu/blockdev.h"
36 #include "hw/block/block.h"
37 #include "block/blockjob.h"
38 #include "block/qdict.h"
39 #include "block/throttle-groups.h"
40 #include "monitor/monitor.h"
41 #include "qemu/error-report.h"
42 #include "qemu/option.h"
43 #include "qemu/qemu-print.h"
44 #include "qemu/config-file.h"
45 #include "qapi/qapi-commands-block.h"
46 #include "qapi/qapi-commands-transaction.h"
47 #include "qapi/qapi-visit-block-core.h"
48 #include "qapi/qmp/qdict.h"
49 #include "qapi/qmp/qnum.h"
50 #include "qapi/qmp/qstring.h"
51 #include "qapi/error.h"
52 #include "qapi/qmp/qerror.h"
53 #include "qapi/qmp/qlist.h"
54 #include "qapi/qobject-output-visitor.h"
55 #include "sysemu/sysemu.h"
56 #include "sysemu/iothread.h"
57 #include "block/block_int.h"
58 #include "block/trace.h"
59 #include "sysemu/arch_init.h"
60 #include "sysemu/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"
67 QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
68 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
70 void bdrv_set_monitor_owned(BlockDriverState *bs)
72 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
75 static const char *const if_name[IF_COUNT] = {
79 [IF_FLOPPY] = "floppy",
80 [IF_PFLASH] = "pflash",
83 [IF_VIRTIO] = "virtio",
87 static int if_max_devs[IF_COUNT] = {
89 * Do not change these numbers! They govern how drive option
90 * index maps to unit and bus. That mapping is ABI.
92 * All controllers used to implement if=T drives need to support
93 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
94 * Otherwise, some index values map to "impossible" bus, unit
97 * For instance, if you change [IF_SCSI] to 255, -drive
98 * if=scsi,index=12 no longer means bus=1,unit=5, but
99 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
100 * the drive can't be set up. Regression.
107 * Boards may call this to offer board-by-board overrides
108 * of the default, global values.
110 void override_max_devs(BlockInterfaceType type, int max_devs)
119 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
120 dinfo = blk_legacy_dinfo(blk);
121 if (dinfo->type == type) {
122 fprintf(stderr, "Cannot override units-per-bus property of"
123 " the %s interface, because a drive of that type has"
124 " already been added.\n", if_name[type]);
125 g_assert_not_reached();
129 if_max_devs[type] = max_devs;
133 * We automatically delete the drive when a device using it gets
134 * unplugged. Questionable feature, but we can't just drop it.
135 * Device models call blockdev_mark_auto_del() to schedule the
136 * automatic deletion, and generic qdev code calls blockdev_auto_del()
137 * when deletion is actually safe.
139 void blockdev_mark_auto_del(BlockBackend *blk)
141 DriveInfo *dinfo = blk_legacy_dinfo(blk);
148 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
149 if (block_job_has_bdrv(job, blk_bs(blk))) {
150 AioContext *aio_context = job->job.aio_context;
151 aio_context_acquire(aio_context);
153 job_cancel(&job->job, false);
155 aio_context_release(aio_context);
162 void blockdev_auto_del(BlockBackend *blk)
164 DriveInfo *dinfo = blk_legacy_dinfo(blk);
166 if (dinfo && dinfo->auto_del) {
167 monitor_remove_blk(blk);
173 * Returns the current mapping of how many units per bus
174 * a particular interface can support.
176 * A positive integer indicates n units per bus.
177 * 0 implies the mapping has not been established.
178 * -1 indicates an invalid BlockInterfaceType was given.
180 int drive_get_max_devs(BlockInterfaceType type)
182 if (type >= IF_IDE && type < IF_COUNT) {
183 return if_max_devs[type];
189 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
191 int max_devs = if_max_devs[type];
192 return max_devs ? index / max_devs : 0;
195 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
197 int max_devs = if_max_devs[type];
198 return max_devs ? index % max_devs : index;
201 QemuOpts *drive_def(const char *optstr)
203 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
206 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
211 opts = drive_def(optstr);
215 if (type != IF_DEFAULT) {
216 qemu_opt_set(opts, "if", if_name[type], &error_abort);
219 qemu_opt_set_number(opts, "index", index, &error_abort);
222 qemu_opt_set(opts, "file", file, &error_abort);
226 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
231 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
232 dinfo = blk_legacy_dinfo(blk);
233 if (dinfo && dinfo->type == type
234 && dinfo->bus == bus && dinfo->unit == unit) {
243 * Check board claimed all -drive that are meant to be claimed.
244 * Fatal error if any remain unclaimed.
246 void drive_check_orphaned(void)
251 bool orphans = false;
253 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
254 dinfo = blk_legacy_dinfo(blk);
256 * Ignore default drives, because we create certain default
257 * drives unconditionally, then leave them unclaimed. Not the
259 * Ignore IF_VIRTIO, because it gets desugared into -device,
260 * so we can leave failing to -device.
261 * Ignore IF_NONE, because leaving unclaimed IF_NONE remains
262 * available for device_add is a feature.
264 if (dinfo->is_default || dinfo->type == IF_VIRTIO
265 || dinfo->type == IF_NONE) {
268 if (!blk_get_attached_dev(blk)) {
270 qemu_opts_loc_restore(dinfo->opts);
271 error_report("machine type does not support"
272 " if=%s,bus=%d,unit=%d",
273 if_name[dinfo->type], dinfo->bus, dinfo->unit);
284 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
286 return drive_get(type,
287 drive_index_to_bus_id(type, index),
288 drive_index_to_unit_id(type, index));
291 int drive_get_max_bus(BlockInterfaceType type)
298 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
299 dinfo = blk_legacy_dinfo(blk);
300 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
301 max_bus = dinfo->bus;
307 /* Get a block device. This should only be used for single-drive devices
308 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
310 DriveInfo *drive_get_next(BlockInterfaceType type)
312 static int next_block_unit[IF_COUNT];
314 return drive_get(type, 0, next_block_unit[type]++);
317 static void bdrv_format_print(void *opaque, const char *name)
319 qemu_printf(" %s", name);
324 BlockDriverState *bs;
327 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
329 if (!strcmp(buf, "ignore")) {
330 return BLOCKDEV_ON_ERROR_IGNORE;
331 } else if (!is_read && !strcmp(buf, "enospc")) {
332 return BLOCKDEV_ON_ERROR_ENOSPC;
333 } else if (!strcmp(buf, "stop")) {
334 return BLOCKDEV_ON_ERROR_STOP;
335 } else if (!strcmp(buf, "report")) {
336 return BLOCKDEV_ON_ERROR_REPORT;
338 error_setg(errp, "'%s' invalid %s error action",
339 buf, is_read ? "read" : "write");
344 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
347 const QListEntry *entry;
348 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
349 switch (qobject_type(entry->value)) {
351 case QTYPE_QSTRING: {
352 unsigned long long length;
353 const char *str = qstring_get_str(qobject_to(QString,
355 if (parse_uint_full(str, &length, 10) == 0 &&
356 length > 0 && length <= UINT_MAX) {
357 block_acct_add_interval(stats, (unsigned) length);
359 error_setg(errp, "Invalid interval length: %s", str);
366 int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
368 if (length > 0 && length <= UINT_MAX) {
369 block_acct_add_interval(stats, (unsigned) length);
371 error_setg(errp, "Invalid interval length: %" PRId64, length);
378 error_setg(errp, "The specification of stats-intervals is invalid");
385 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
387 /* All parameters but @opts are optional and may be set to NULL. */
388 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
389 const char **throttling_group, ThrottleConfig *throttle_cfg,
390 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
392 Error *local_error = NULL;
396 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
397 *bdrv_flags |= BDRV_O_COPY_ON_READ;
400 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
401 if (bdrv_parse_aio(aio, bdrv_flags) < 0) {
402 error_setg(errp, "invalid aio option");
408 /* disk I/O throttling */
409 if (throttling_group) {
410 *throttling_group = qemu_opt_get(opts, "throttling.group");
414 throttle_config_init(throttle_cfg);
415 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
416 qemu_opt_get_number(opts, "throttling.bps-total", 0);
417 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
418 qemu_opt_get_number(opts, "throttling.bps-read", 0);
419 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
420 qemu_opt_get_number(opts, "throttling.bps-write", 0);
421 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
422 qemu_opt_get_number(opts, "throttling.iops-total", 0);
423 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
424 qemu_opt_get_number(opts, "throttling.iops-read", 0);
425 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
426 qemu_opt_get_number(opts, "throttling.iops-write", 0);
428 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
429 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
430 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
431 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
432 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
433 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
434 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
435 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
436 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
437 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
438 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
439 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
441 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
442 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
443 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
444 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
445 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
446 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
447 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
448 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
449 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
450 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
451 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
452 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
454 throttle_cfg->op_size =
455 qemu_opt_get_number(opts, "throttling.iops-size", 0);
457 if (!throttle_is_valid(throttle_cfg, errp)) {
464 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
465 qemu_opt_get(opts, "detect-zeroes"),
466 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
469 error_propagate(errp, local_error);
475 /* Takes the ownership of bs_opts */
476 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
481 int on_read_error, on_write_error;
482 bool account_invalid, account_failed;
483 bool writethrough, read_only;
485 BlockDriverState *bs;
490 QDict *interval_dict = NULL;
491 QList *interval_list = NULL;
493 BlockdevDetectZeroesOptions detect_zeroes =
494 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
495 const char *throttling_group = NULL;
497 /* Check common options by copying from bs_opts to opts, all other options
498 * stay in bs_opts for processing by bdrv_open(). */
499 id = qdict_get_try_str(bs_opts, "id");
500 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, errp);
505 if (!qemu_opts_absorb_qdict(opts, bs_opts, errp)) {
510 qdict_del(bs_opts, "id");
513 /* extract parameters */
514 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
516 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
517 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
519 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
521 id = qemu_opts_id(opts);
523 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
524 qdict_array_split(interval_dict, &interval_list);
526 if (qdict_size(interval_dict) != 0) {
527 error_setg(errp, "Invalid option stats-intervals.%s",
528 qdict_first(interval_dict)->key);
532 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
533 &detect_zeroes, &error);
535 error_propagate(errp, error);
539 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
540 if (is_help_option(buf)) {
541 qemu_printf("Supported formats:");
542 bdrv_iterate_format(bdrv_format_print, NULL, false);
543 qemu_printf("\nSupported formats (read-only):");
544 bdrv_iterate_format(bdrv_format_print, NULL, true);
549 if (qdict_haskey(bs_opts, "driver")) {
550 error_setg(errp, "Cannot specify both 'driver' and 'format'");
553 qdict_put_str(bs_opts, "driver", buf);
556 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
557 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
558 on_write_error = parse_block_error_action(buf, 0, &error);
560 error_propagate(errp, error);
565 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
566 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
567 on_read_error = parse_block_error_action(buf, 1, &error);
569 error_propagate(errp, error);
575 bdrv_flags |= BDRV_O_SNAPSHOT;
578 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
581 if ((!file || !*file) && !qdict_size(bs_opts)) {
582 BlockBackendRootState *blk_rs;
584 blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL);
585 blk_rs = blk_get_root_state(blk);
586 blk_rs->open_flags = bdrv_flags;
587 blk_rs->read_only = read_only;
588 blk_rs->detect_zeroes = detect_zeroes;
590 qobject_unref(bs_opts);
592 if (file && !*file) {
596 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
597 * with other callers) rather than what we want as the real defaults.
598 * Apply the defaults here instead. */
599 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
600 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
601 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
602 read_only ? "on" : "off");
603 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on");
604 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
606 if (runstate_check(RUN_STATE_INMIGRATE)) {
607 bdrv_flags |= BDRV_O_INACTIVE;
610 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
616 bs->detect_zeroes = detect_zeroes;
618 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
620 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
627 /* disk I/O throttling */
628 if (throttle_enabled(&cfg)) {
629 if (!throttling_group) {
630 throttling_group = id;
632 blk_io_limits_enable(blk, throttling_group);
633 blk_set_io_limits(blk, &cfg);
636 blk_set_enable_write_cache(blk, !writethrough);
637 blk_set_on_error(blk, on_read_error, on_write_error);
639 if (!monitor_add_blk(blk, id, errp)) {
647 qobject_unref(interval_dict);
648 qobject_unref(interval_list);
653 qobject_unref(interval_dict);
654 qobject_unref(interval_list);
656 qobject_unref(bs_opts);
660 /* Takes the ownership of bs_opts */
661 BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
665 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
666 * with other callers) rather than what we want as the real defaults.
667 * Apply the defaults here instead. */
668 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
669 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
670 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
672 if (runstate_check(RUN_STATE_INMIGRATE)) {
673 bdrv_flags |= BDRV_O_INACTIVE;
676 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
679 void blockdev_close_all_bdrv_states(void)
681 BlockDriverState *bs, *next_bs;
683 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
684 AioContext *ctx = bdrv_get_aio_context(bs);
686 aio_context_acquire(ctx);
688 aio_context_release(ctx);
692 /* Iterates over the list of monitor-owned BlockDriverStates */
693 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
695 return bs ? QTAILQ_NEXT(bs, monitor_list)
696 : QTAILQ_FIRST(&monitor_bdrv_states);
699 static bool qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
704 value = qemu_opt_get(opts, from);
706 if (qemu_opt_find(opts, to)) {
707 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
708 "same time", to, from);
713 /* rename all items in opts */
714 while ((value = qemu_opt_get(opts, from))) {
715 qemu_opt_set(opts, to, value, &error_abort);
716 qemu_opt_unset(opts, from);
721 QemuOptsList qemu_legacy_drive_opts = {
723 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
727 .type = QEMU_OPT_NUMBER,
728 .help = "bus number",
731 .type = QEMU_OPT_NUMBER,
732 .help = "unit number (i.e. lun for scsi)",
735 .type = QEMU_OPT_NUMBER,
736 .help = "index number",
739 .type = QEMU_OPT_STRING,
740 .help = "media type (disk, cdrom)",
743 .type = QEMU_OPT_STRING,
744 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
747 .type = QEMU_OPT_STRING,
751 /* Options that are passed on, but have special semantics with -drive */
753 .name = BDRV_OPT_READ_ONLY,
754 .type = QEMU_OPT_BOOL,
755 .help = "open drive file as read-only",
758 .type = QEMU_OPT_STRING,
759 .help = "read error action",
762 .type = QEMU_OPT_STRING,
763 .help = "write error action",
765 .name = "copy-on-read",
766 .type = QEMU_OPT_BOOL,
767 .help = "copy read data from backing file into image file",
770 { /* end of list */ }
774 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type,
779 DriveInfo *dinfo = NULL;
781 QemuOpts *legacy_opts;
782 DriveMediaType media = MEDIA_DISK;
783 BlockInterfaceType type;
784 int max_devs, bus_id, unit_id, index;
785 const char *werror, *rerror;
786 bool read_only = false;
788 const char *filename;
791 /* Change legacy command line options into QMP ones */
792 static const struct {
796 { "iops", "throttling.iops-total" },
797 { "iops_rd", "throttling.iops-read" },
798 { "iops_wr", "throttling.iops-write" },
800 { "bps", "throttling.bps-total" },
801 { "bps_rd", "throttling.bps-read" },
802 { "bps_wr", "throttling.bps-write" },
804 { "iops_max", "throttling.iops-total-max" },
805 { "iops_rd_max", "throttling.iops-read-max" },
806 { "iops_wr_max", "throttling.iops-write-max" },
808 { "bps_max", "throttling.bps-total-max" },
809 { "bps_rd_max", "throttling.bps-read-max" },
810 { "bps_wr_max", "throttling.bps-write-max" },
812 { "iops_size", "throttling.iops-size" },
814 { "group", "throttling.group" },
816 { "readonly", BDRV_OPT_READ_ONLY },
819 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
820 if (!qemu_opt_rename(all_opts, opt_renames[i].from,
821 opt_renames[i].to, errp)) {
826 value = qemu_opt_get(all_opts, "cache");
831 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
832 error_setg(errp, "invalid cache option");
836 /* Specific options take precedence */
837 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
838 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
839 !writethrough, &error_abort);
841 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
842 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
843 !!(flags & BDRV_O_NOCACHE), &error_abort);
845 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
846 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
847 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
849 qemu_opt_unset(all_opts, "cache");
852 /* Get a QDict for processing the options */
853 bs_opts = qdict_new();
854 qemu_opts_to_qdict(all_opts, bs_opts);
856 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
858 if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) {
863 value = qemu_opt_get(legacy_opts, "media");
865 if (!strcmp(value, "disk")) {
867 } else if (!strcmp(value, "cdrom")) {
871 error_setg(errp, "'%s' invalid media", value);
876 /* copy-on-read is disabled with a warning for read-only devices */
877 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
878 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
880 if (read_only && copy_on_read) {
881 warn_report("disabling copy-on-read on read-only drive");
882 copy_on_read = false;
885 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
886 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
888 /* Controller type */
889 value = qemu_opt_get(legacy_opts, "if");
892 type < IF_COUNT && strcmp(value, if_name[type]);
895 if (type == IF_COUNT) {
896 error_setg(errp, "unsupported bus type '%s'", value);
900 type = block_default_type;
903 /* Device address specified by bus/unit or index.
904 * If none was specified, try to find the first free one. */
905 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
906 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
907 index = qemu_opt_get_number(legacy_opts, "index", -1);
909 max_devs = if_max_devs[type];
912 if (bus_id != 0 || unit_id != -1) {
913 error_setg(errp, "index cannot be used with bus and unit");
916 bus_id = drive_index_to_bus_id(type, index);
917 unit_id = drive_index_to_unit_id(type, index);
922 while (drive_get(type, bus_id, unit_id) != NULL) {
924 if (max_devs && unit_id >= max_devs) {
931 if (max_devs && unit_id >= max_devs) {
932 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1);
936 if (drive_get(type, bus_id, unit_id) != NULL) {
937 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists",
938 bus_id, unit_id, index);
942 /* no id supplied -> create one */
943 if (qemu_opts_id(all_opts) == NULL) {
945 const char *mediastr = "";
946 if (type == IF_IDE || type == IF_SCSI) {
947 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
950 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
953 new_id = g_strdup_printf("%s%s%i", if_name[type],
956 qdict_put_str(bs_opts, "id", new_id);
960 /* Add virtio block device */
961 if (type == IF_VIRTIO) {
963 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
965 qemu_opt_set(devopts, "driver", "virtio-blk", &error_abort);
966 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
970 filename = qemu_opt_get(legacy_opts, "file");
972 /* Check werror/rerror compatibility with if=... */
973 werror = qemu_opt_get(legacy_opts, "werror");
974 if (werror != NULL) {
975 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
977 error_setg(errp, "werror is not supported by this bus type");
980 qdict_put_str(bs_opts, "werror", werror);
983 rerror = qemu_opt_get(legacy_opts, "rerror");
984 if (rerror != NULL) {
985 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
987 error_setg(errp, "rerror is not supported by this bus type");
990 qdict_put_str(bs_opts, "rerror", rerror);
993 /* Actual block device init: Functionality shared with blockdev-add */
994 blk = blockdev_init(filename, bs_opts, errp);
1000 /* Create legacy DriveInfo */
1001 dinfo = g_malloc0(sizeof(*dinfo));
1002 dinfo->opts = all_opts;
1005 dinfo->bus = bus_id;
1006 dinfo->unit = unit_id;
1008 blk_set_legacy_dinfo(blk, dinfo);
1015 dinfo->media_cd = media == MEDIA_CDROM;
1022 qemu_opts_del(legacy_opts);
1023 qobject_unref(bs_opts);
1027 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1029 BlockDriverState *bs;
1031 bs = bdrv_lookup_bs(name, name, errp);
1036 if (!bdrv_is_root_node(bs)) {
1037 error_setg(errp, "Need a root block node");
1041 if (!bdrv_is_inserted(bs)) {
1042 error_setg(errp, "Device has no medium");
1049 static void blockdev_do_action(TransactionAction *action, Error **errp)
1051 TransactionActionList list;
1053 list.value = action;
1055 qmp_transaction(&list, false, NULL, errp);
1058 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1059 bool has_node_name, const char *node_name,
1060 const char *snapshot_file,
1061 bool has_snapshot_node_name,
1062 const char *snapshot_node_name,
1063 bool has_format, const char *format,
1064 bool has_mode, NewImageMode mode, Error **errp)
1066 BlockdevSnapshotSync snapshot = {
1067 .has_device = has_device,
1068 .device = (char *) device,
1069 .has_node_name = has_node_name,
1070 .node_name = (char *) node_name,
1071 .snapshot_file = (char *) snapshot_file,
1072 .has_snapshot_node_name = has_snapshot_node_name,
1073 .snapshot_node_name = (char *) snapshot_node_name,
1074 .has_format = has_format,
1075 .format = (char *) format,
1076 .has_mode = has_mode,
1079 TransactionAction action = {
1080 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1081 .u.blockdev_snapshot_sync.data = &snapshot,
1083 blockdev_do_action(&action, errp);
1086 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1089 BlockdevSnapshot snapshot_data = {
1090 .node = (char *) node,
1091 .overlay = (char *) overlay
1093 TransactionAction action = {
1094 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1095 .u.blockdev_snapshot.data = &snapshot_data,
1097 blockdev_do_action(&action, errp);
1100 void qmp_blockdev_snapshot_internal_sync(const char *device,
1104 BlockdevSnapshotInternal snapshot = {
1105 .device = (char *) device,
1106 .name = (char *) name
1108 TransactionAction action = {
1109 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1110 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1112 blockdev_do_action(&action, errp);
1115 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1122 BlockDriverState *bs;
1123 AioContext *aio_context;
1124 QEMUSnapshotInfo sn;
1125 Error *local_err = NULL;
1126 SnapshotInfo *info = NULL;
1129 bs = qmp_get_root_bs(device, errp);
1133 aio_context = bdrv_get_aio_context(bs);
1134 aio_context_acquire(aio_context);
1145 error_setg(errp, "Name or id must be provided");
1146 goto out_aio_context;
1149 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1150 goto out_aio_context;
1153 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1155 error_propagate(errp, local_err);
1156 goto out_aio_context;
1160 "Snapshot with id '%s' and name '%s' does not exist on "
1162 STR_OR_NULL(id), STR_OR_NULL(name), device);
1163 goto out_aio_context;
1166 bdrv_snapshot_delete(bs, id, name, &local_err);
1168 error_propagate(errp, local_err);
1169 goto out_aio_context;
1172 aio_context_release(aio_context);
1174 info = g_new0(SnapshotInfo, 1);
1175 info->id = g_strdup(sn.id_str);
1176 info->name = g_strdup(sn.name);
1177 info->date_nsec = sn.date_nsec;
1178 info->date_sec = sn.date_sec;
1179 info->vm_state_size = sn.vm_state_size;
1180 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1181 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1182 if (sn.icount != -1ULL) {
1183 info->icount = sn.icount;
1184 info->has_icount = true;
1190 aio_context_release(aio_context);
1194 /* New and old BlockDriverState structs for atomic group operations */
1196 typedef struct BlkActionState BlkActionState;
1200 * Table of operations that define an Action.
1202 * @instance_size: Size of state struct, in bytes.
1203 * @prepare: Prepare the work, must NOT be NULL.
1204 * @commit: Commit the changes, can be NULL.
1205 * @abort: Abort the changes on fail, can be NULL.
1206 * @clean: Clean up resources after all transaction actions have called
1207 * commit() or abort(). Can be NULL.
1209 * Only prepare() may fail. In a single transaction, only one of commit() or
1210 * abort() will be called. clean() will always be called if it is present.
1212 typedef struct BlkActionOps {
1213 size_t instance_size;
1214 void (*prepare)(BlkActionState *common, Error **errp);
1215 void (*commit)(BlkActionState *common);
1216 void (*abort)(BlkActionState *common);
1217 void (*clean)(BlkActionState *common);
1222 * Describes one Action's state within a Transaction.
1224 * @action: QAPI-defined enum identifying which Action to perform.
1225 * @ops: Table of ActionOps this Action can perform.
1226 * @block_job_txn: Transaction which this action belongs to.
1227 * @entry: List membership for all Actions in this Transaction.
1229 * This structure must be arranged as first member in a subclassed type,
1230 * assuming that the compiler will also arrange it to the same offsets as the
1233 struct BlkActionState {
1234 TransactionAction *action;
1235 const BlkActionOps *ops;
1236 JobTxn *block_job_txn;
1237 TransactionProperties *txn_props;
1238 QTAILQ_ENTRY(BlkActionState) entry;
1241 /* internal snapshot private data */
1242 typedef struct InternalSnapshotState {
1243 BlkActionState common;
1244 BlockDriverState *bs;
1245 QEMUSnapshotInfo sn;
1247 } InternalSnapshotState;
1250 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1252 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1254 "Action '%s' does not support Transaction property "
1255 "completion-mode = %s",
1256 TransactionActionKind_str(s->action->type),
1257 ActionCompletionMode_str(s->txn_props->completion_mode));
1263 static void internal_snapshot_prepare(BlkActionState *common,
1266 Error *local_err = NULL;
1269 BlockDriverState *bs;
1270 QEMUSnapshotInfo old_sn, *sn;
1273 BlockdevSnapshotInternal *internal;
1274 InternalSnapshotState *state;
1275 AioContext *aio_context;
1278 g_assert(common->action->type ==
1279 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1280 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1281 state = DO_UPCAST(InternalSnapshotState, common, common);
1283 /* 1. parse input */
1284 device = internal->device;
1285 name = internal->name;
1287 /* 2. check for validation */
1288 if (action_check_completion_mode(common, errp) < 0) {
1292 bs = qmp_get_root_bs(device, errp);
1297 aio_context = bdrv_get_aio_context(bs);
1298 aio_context_acquire(aio_context);
1302 /* Paired with .clean() */
1303 bdrv_drained_begin(bs);
1305 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1309 if (bdrv_is_read_only(bs)) {
1310 error_setg(errp, "Device '%s' is read only", device);
1314 if (!bdrv_can_snapshot(bs)) {
1315 error_setg(errp, "Block format '%s' used by device '%s' "
1316 "does not support internal snapshots",
1317 bs->drv->format_name, device);
1321 if (!strlen(name)) {
1322 error_setg(errp, "Name is empty");
1326 /* check whether a snapshot with name exist */
1327 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1330 error_propagate(errp, local_err);
1334 "Snapshot with name '%s' already exists on device '%s'",
1339 /* 3. take the snapshot */
1341 pstrcpy(sn->name, sizeof(sn->name), name);
1342 qemu_gettimeofday(&tv);
1343 sn->date_sec = tv.tv_sec;
1344 sn->date_nsec = tv.tv_usec * 1000;
1345 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1346 if (replay_mode != REPLAY_MODE_NONE) {
1347 sn->icount = replay_get_current_icount();
1352 ret1 = bdrv_snapshot_create(bs, sn);
1354 error_setg_errno(errp, -ret1,
1355 "Failed to create snapshot '%s' on device '%s'",
1360 /* 4. succeed, mark a snapshot is created */
1361 state->created = true;
1364 aio_context_release(aio_context);
1367 static void internal_snapshot_abort(BlkActionState *common)
1369 InternalSnapshotState *state =
1370 DO_UPCAST(InternalSnapshotState, common, common);
1371 BlockDriverState *bs = state->bs;
1372 QEMUSnapshotInfo *sn = &state->sn;
1373 AioContext *aio_context;
1374 Error *local_error = NULL;
1376 if (!state->created) {
1380 aio_context = bdrv_get_aio_context(state->bs);
1381 aio_context_acquire(aio_context);
1383 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1384 error_reportf_err(local_error,
1385 "Failed to delete snapshot with id '%s' and "
1386 "name '%s' on device '%s' in abort: ",
1387 sn->id_str, sn->name,
1388 bdrv_get_device_name(bs));
1391 aio_context_release(aio_context);
1394 static void internal_snapshot_clean(BlkActionState *common)
1396 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1398 AioContext *aio_context;
1404 aio_context = bdrv_get_aio_context(state->bs);
1405 aio_context_acquire(aio_context);
1407 bdrv_drained_end(state->bs);
1409 aio_context_release(aio_context);
1412 /* external snapshot private data */
1413 typedef struct ExternalSnapshotState {
1414 BlkActionState common;
1415 BlockDriverState *old_bs;
1416 BlockDriverState *new_bs;
1417 bool overlay_appended;
1418 } ExternalSnapshotState;
1420 static void external_snapshot_prepare(BlkActionState *common,
1425 QDict *options = NULL;
1426 Error *local_err = NULL;
1427 /* Device and node name of the image to generate the snapshot from */
1429 const char *node_name;
1430 /* Reference to the new image (for 'blockdev-snapshot') */
1431 const char *snapshot_ref;
1432 /* File name of the new image (for 'blockdev-snapshot-sync') */
1433 const char *new_image_file;
1434 ExternalSnapshotState *state =
1435 DO_UPCAST(ExternalSnapshotState, common, common);
1436 TransactionAction *action = common->action;
1437 AioContext *aio_context;
1438 uint64_t perm, shared;
1440 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1441 * purpose but a different set of parameters */
1442 switch (action->type) {
1443 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1445 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1447 node_name = s->node;
1448 new_image_file = NULL;
1449 snapshot_ref = s->overlay;
1452 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1454 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1455 device = s->has_device ? s->device : NULL;
1456 node_name = s->has_node_name ? s->node_name : NULL;
1457 new_image_file = s->snapshot_file;
1458 snapshot_ref = NULL;
1462 g_assert_not_reached();
1465 /* start processing */
1466 if (action_check_completion_mode(common, errp) < 0) {
1470 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1471 if (!state->old_bs) {
1475 aio_context = bdrv_get_aio_context(state->old_bs);
1476 aio_context_acquire(aio_context);
1478 /* Paired with .clean() */
1479 bdrv_drained_begin(state->old_bs);
1481 if (!bdrv_is_inserted(state->old_bs)) {
1482 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1486 if (bdrv_op_is_blocked(state->old_bs,
1487 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1491 if (!bdrv_is_read_only(state->old_bs)) {
1492 if (bdrv_flush(state->old_bs)) {
1493 error_setg(errp, QERR_IO_ERROR);
1498 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1499 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1500 const char *format = s->has_format ? s->format : "qcow2";
1501 enum NewImageMode mode;
1502 const char *snapshot_node_name =
1503 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1505 if (node_name && !snapshot_node_name) {
1506 error_setg(errp, "New overlay node-name missing");
1510 if (snapshot_node_name &&
1511 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1512 error_setg(errp, "New overlay node-name already in use");
1516 flags = state->old_bs->open_flags;
1517 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1518 flags |= BDRV_O_NO_BACKING;
1520 /* create new image w/backing file */
1521 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1522 if (mode != NEW_IMAGE_MODE_EXISTING) {
1523 int64_t size = bdrv_getlength(state->old_bs);
1525 error_setg_errno(errp, -size, "bdrv_getlength failed");
1528 bdrv_refresh_filename(state->old_bs);
1529 bdrv_img_create(new_image_file, format,
1530 state->old_bs->filename,
1531 state->old_bs->drv->format_name,
1532 NULL, size, flags, false, &local_err);
1534 error_propagate(errp, local_err);
1539 options = qdict_new();
1540 if (snapshot_node_name) {
1541 qdict_put_str(options, "node-name", snapshot_node_name);
1543 qdict_put_str(options, "driver", format);
1546 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1548 /* We will manually add the backing_hd field to the bs later */
1549 if (!state->new_bs) {
1554 * Allow attaching a backing file to an overlay that's already in use only
1555 * if the parents don't assume that they are already seeing a valid image.
1556 * (Specifically, allow it as a mirror target, which is write-only access.)
1558 bdrv_get_cumulative_perm(state->new_bs, &perm, &shared);
1559 if (perm & BLK_PERM_CONSISTENT_READ) {
1560 error_setg(errp, "The overlay is already in use");
1564 if (state->new_bs->drv->is_filter) {
1565 error_setg(errp, "Filters cannot be used as overlays");
1569 if (bdrv_cow_child(state->new_bs)) {
1570 error_setg(errp, "The overlay already has a backing image");
1574 if (!state->new_bs->drv->supports_backing) {
1575 error_setg(errp, "The overlay does not support backing images");
1579 /* This removes our old bs and adds the new bs. This is an operation that
1580 * can fail, so we need to do it in .prepare; undoing it for abort is
1581 * always possible. */
1582 bdrv_ref(state->new_bs);
1583 ret = bdrv_append(state->new_bs, state->old_bs, errp);
1587 state->overlay_appended = true;
1590 aio_context_release(aio_context);
1593 static void external_snapshot_commit(BlkActionState *common)
1595 ExternalSnapshotState *state =
1596 DO_UPCAST(ExternalSnapshotState, common, common);
1597 AioContext *aio_context;
1599 aio_context = bdrv_get_aio_context(state->old_bs);
1600 aio_context_acquire(aio_context);
1602 /* We don't need (or want) to use the transactional
1603 * bdrv_reopen_multiple() across all the entries at once, because we
1604 * don't want to abort all of them if one of them fails the reopen */
1605 if (!qatomic_read(&state->old_bs->copy_on_read)) {
1606 bdrv_reopen_set_read_only(state->old_bs, true, NULL);
1609 aio_context_release(aio_context);
1612 static void external_snapshot_abort(BlkActionState *common)
1614 ExternalSnapshotState *state =
1615 DO_UPCAST(ExternalSnapshotState, common, common);
1616 if (state->new_bs) {
1617 if (state->overlay_appended) {
1618 AioContext *aio_context;
1619 AioContext *tmp_context;
1622 aio_context = bdrv_get_aio_context(state->old_bs);
1623 aio_context_acquire(aio_context);
1625 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1626 close state->old_bs; we need it */
1627 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1630 * The call to bdrv_set_backing_hd() above returns state->old_bs to
1631 * the main AioContext. As we're still going to be using it, return
1632 * it to the AioContext it was before.
1634 tmp_context = bdrv_get_aio_context(state->old_bs);
1635 if (aio_context != tmp_context) {
1636 aio_context_release(aio_context);
1637 aio_context_acquire(tmp_context);
1639 ret = bdrv_try_set_aio_context(state->old_bs,
1643 aio_context_release(tmp_context);
1644 aio_context_acquire(aio_context);
1647 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1648 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1650 aio_context_release(aio_context);
1655 static void external_snapshot_clean(BlkActionState *common)
1657 ExternalSnapshotState *state =
1658 DO_UPCAST(ExternalSnapshotState, common, common);
1659 AioContext *aio_context;
1661 if (!state->old_bs) {
1665 aio_context = bdrv_get_aio_context(state->old_bs);
1666 aio_context_acquire(aio_context);
1668 bdrv_drained_end(state->old_bs);
1669 bdrv_unref(state->new_bs);
1671 aio_context_release(aio_context);
1674 typedef struct DriveBackupState {
1675 BlkActionState common;
1676 BlockDriverState *bs;
1680 static BlockJob *do_backup_common(BackupCommon *backup,
1681 BlockDriverState *bs,
1682 BlockDriverState *target_bs,
1683 AioContext *aio_context,
1684 JobTxn *txn, Error **errp);
1686 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1688 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1689 DriveBackup *backup;
1690 BlockDriverState *bs;
1691 BlockDriverState *target_bs;
1692 BlockDriverState *source = NULL;
1693 AioContext *aio_context;
1694 AioContext *old_context;
1696 Error *local_err = NULL;
1699 bool set_backing_hd = false;
1702 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1703 backup = common->action->u.drive_backup.data;
1705 if (!backup->has_mode) {
1706 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1709 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1715 error_setg(errp, "Device has no medium");
1719 aio_context = bdrv_get_aio_context(bs);
1720 aio_context_acquire(aio_context);
1722 /* Paired with .clean() */
1723 bdrv_drained_begin(bs);
1725 if (!backup->has_format) {
1726 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
1727 NULL : (char *) bs->drv->format_name;
1730 /* Early check to avoid creating target */
1731 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
1735 flags = bs->open_flags | BDRV_O_RDWR;
1738 * See if we have a backing HD we can use to create our new image
1741 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
1743 * Backup will not replace the source by the target, so none
1744 * of the filters skipped here will be removed (in contrast to
1745 * mirror). Therefore, we can skip all of them when looking
1746 * for the first COW relationship.
1748 source = bdrv_cow_bs(bdrv_skip_filters(bs));
1750 backup->sync = MIRROR_SYNC_MODE_FULL;
1753 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
1755 flags |= BDRV_O_NO_BACKING;
1756 set_backing_hd = true;
1759 size = bdrv_getlength(bs);
1761 error_setg_errno(errp, -size, "bdrv_getlength failed");
1765 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
1766 assert(backup->format);
1768 /* Implicit filters should not appear in the filename */
1769 BlockDriverState *explicit_backing =
1770 bdrv_skip_implicit_filters(source);
1772 bdrv_refresh_filename(explicit_backing);
1773 bdrv_img_create(backup->target, backup->format,
1774 explicit_backing->filename,
1775 explicit_backing->drv->format_name, NULL,
1776 size, flags, false, &local_err);
1778 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
1779 size, flags, false, &local_err);
1784 error_propagate(errp, local_err);
1788 options = qdict_new();
1789 qdict_put_str(options, "discard", "unmap");
1790 qdict_put_str(options, "detect-zeroes", "unmap");
1791 if (backup->format) {
1792 qdict_put_str(options, "driver", backup->format);
1795 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
1800 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
1801 old_context = bdrv_get_aio_context(target_bs);
1802 aio_context_release(aio_context);
1803 aio_context_acquire(old_context);
1805 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
1807 bdrv_unref(target_bs);
1808 aio_context_release(old_context);
1812 aio_context_release(old_context);
1813 aio_context_acquire(aio_context);
1815 if (set_backing_hd) {
1816 if (bdrv_set_backing_hd(target_bs, source, errp) < 0) {
1823 state->job = do_backup_common(qapi_DriveBackup_base(backup),
1824 bs, target_bs, aio_context,
1825 common->block_job_txn, errp);
1828 bdrv_unref(target_bs);
1830 aio_context_release(aio_context);
1833 static void drive_backup_commit(BlkActionState *common)
1835 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1836 AioContext *aio_context;
1838 aio_context = bdrv_get_aio_context(state->bs);
1839 aio_context_acquire(aio_context);
1842 job_start(&state->job->job);
1844 aio_context_release(aio_context);
1847 static void drive_backup_abort(BlkActionState *common)
1849 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1852 AioContext *aio_context;
1854 aio_context = bdrv_get_aio_context(state->bs);
1855 aio_context_acquire(aio_context);
1857 job_cancel_sync(&state->job->job);
1859 aio_context_release(aio_context);
1863 static void drive_backup_clean(BlkActionState *common)
1865 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1866 AioContext *aio_context;
1872 aio_context = bdrv_get_aio_context(state->bs);
1873 aio_context_acquire(aio_context);
1875 bdrv_drained_end(state->bs);
1877 aio_context_release(aio_context);
1880 typedef struct BlockdevBackupState {
1881 BlkActionState common;
1882 BlockDriverState *bs;
1884 } BlockdevBackupState;
1886 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1888 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1889 BlockdevBackup *backup;
1890 BlockDriverState *bs;
1891 BlockDriverState *target_bs;
1892 AioContext *aio_context;
1893 AioContext *old_context;
1896 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1897 backup = common->action->u.blockdev_backup.data;
1899 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1904 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
1909 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
1910 aio_context = bdrv_get_aio_context(bs);
1911 old_context = bdrv_get_aio_context(target_bs);
1912 aio_context_acquire(old_context);
1914 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
1916 aio_context_release(old_context);
1920 aio_context_release(old_context);
1921 aio_context_acquire(aio_context);
1924 /* Paired with .clean() */
1925 bdrv_drained_begin(state->bs);
1927 state->job = do_backup_common(qapi_BlockdevBackup_base(backup),
1928 bs, target_bs, aio_context,
1929 common->block_job_txn, errp);
1931 aio_context_release(aio_context);
1934 static void blockdev_backup_commit(BlkActionState *common)
1936 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1937 AioContext *aio_context;
1939 aio_context = bdrv_get_aio_context(state->bs);
1940 aio_context_acquire(aio_context);
1943 job_start(&state->job->job);
1945 aio_context_release(aio_context);
1948 static void blockdev_backup_abort(BlkActionState *common)
1950 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1953 AioContext *aio_context;
1955 aio_context = bdrv_get_aio_context(state->bs);
1956 aio_context_acquire(aio_context);
1958 job_cancel_sync(&state->job->job);
1960 aio_context_release(aio_context);
1964 static void blockdev_backup_clean(BlkActionState *common)
1966 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1967 AioContext *aio_context;
1973 aio_context = bdrv_get_aio_context(state->bs);
1974 aio_context_acquire(aio_context);
1976 bdrv_drained_end(state->bs);
1978 aio_context_release(aio_context);
1981 typedef struct BlockDirtyBitmapState {
1982 BlkActionState common;
1983 BdrvDirtyBitmap *bitmap;
1984 BlockDriverState *bs;
1988 } BlockDirtyBitmapState;
1990 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
1993 Error *local_err = NULL;
1994 BlockDirtyBitmapAdd *action;
1995 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1998 if (action_check_completion_mode(common, errp) < 0) {
2002 action = common->action->u.block_dirty_bitmap_add.data;
2003 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2004 qmp_block_dirty_bitmap_add(action->node, action->name,
2005 action->has_granularity, action->granularity,
2006 action->has_persistent, action->persistent,
2007 action->has_disabled, action->disabled,
2011 state->prepared = true;
2013 error_propagate(errp, local_err);
2017 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2019 BlockDirtyBitmapAdd *action;
2020 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2023 action = common->action->u.block_dirty_bitmap_add.data;
2024 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2025 * then the node reference and bitmap name must have been valid.
2027 if (state->prepared) {
2028 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2032 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2035 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2037 BlockDirtyBitmap *action;
2039 if (action_check_completion_mode(common, errp) < 0) {
2043 action = common->action->u.block_dirty_bitmap_clear.data;
2044 state->bitmap = block_dirty_bitmap_lookup(action->node,
2048 if (!state->bitmap) {
2052 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) {
2056 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2059 static void block_dirty_bitmap_restore(BlkActionState *common)
2061 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2064 if (state->backup) {
2065 bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
2069 static void block_dirty_bitmap_free_backup(BlkActionState *common)
2071 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2074 hbitmap_free(state->backup);
2077 static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
2080 BlockDirtyBitmap *action;
2081 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2084 if (action_check_completion_mode(common, errp) < 0) {
2088 action = common->action->u.block_dirty_bitmap_enable.data;
2089 state->bitmap = block_dirty_bitmap_lookup(action->node,
2093 if (!state->bitmap) {
2097 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2101 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2102 bdrv_enable_dirty_bitmap(state->bitmap);
2105 static void block_dirty_bitmap_enable_abort(BlkActionState *common)
2107 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2110 if (!state->was_enabled) {
2111 bdrv_disable_dirty_bitmap(state->bitmap);
2115 static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
2118 BlockDirtyBitmap *action;
2119 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2122 if (action_check_completion_mode(common, errp) < 0) {
2126 action = common->action->u.block_dirty_bitmap_disable.data;
2127 state->bitmap = block_dirty_bitmap_lookup(action->node,
2131 if (!state->bitmap) {
2135 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2139 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2140 bdrv_disable_dirty_bitmap(state->bitmap);
2143 static void block_dirty_bitmap_disable_abort(BlkActionState *common)
2145 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2148 if (state->was_enabled) {
2149 bdrv_enable_dirty_bitmap(state->bitmap);
2153 static void block_dirty_bitmap_merge_prepare(BlkActionState *common,
2156 BlockDirtyBitmapMerge *action;
2157 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2160 if (action_check_completion_mode(common, errp) < 0) {
2164 action = common->action->u.block_dirty_bitmap_merge.data;
2166 state->bitmap = block_dirty_bitmap_merge(action->node, action->target,
2167 action->bitmaps, &state->backup,
2171 static void block_dirty_bitmap_remove_prepare(BlkActionState *common,
2174 BlockDirtyBitmap *action;
2175 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2178 if (action_check_completion_mode(common, errp) < 0) {
2182 action = common->action->u.block_dirty_bitmap_remove.data;
2184 state->bitmap = block_dirty_bitmap_remove(action->node, action->name,
2185 false, &state->bs, errp);
2186 if (state->bitmap) {
2187 bdrv_dirty_bitmap_skip_store(state->bitmap, true);
2188 bdrv_dirty_bitmap_set_busy(state->bitmap, true);
2192 static void block_dirty_bitmap_remove_abort(BlkActionState *common)
2194 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2197 if (state->bitmap) {
2198 bdrv_dirty_bitmap_skip_store(state->bitmap, false);
2199 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2203 static void block_dirty_bitmap_remove_commit(BlkActionState *common)
2205 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2208 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2209 bdrv_release_dirty_bitmap(state->bitmap);
2212 static void abort_prepare(BlkActionState *common, Error **errp)
2214 error_setg(errp, "Transaction aborted using Abort action");
2217 static void abort_commit(BlkActionState *common)
2219 g_assert_not_reached(); /* this action never succeeds */
2222 static const BlkActionOps actions[] = {
2223 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2224 .instance_size = sizeof(ExternalSnapshotState),
2225 .prepare = external_snapshot_prepare,
2226 .commit = external_snapshot_commit,
2227 .abort = external_snapshot_abort,
2228 .clean = external_snapshot_clean,
2230 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2231 .instance_size = sizeof(ExternalSnapshotState),
2232 .prepare = external_snapshot_prepare,
2233 .commit = external_snapshot_commit,
2234 .abort = external_snapshot_abort,
2235 .clean = external_snapshot_clean,
2237 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2238 .instance_size = sizeof(DriveBackupState),
2239 .prepare = drive_backup_prepare,
2240 .commit = drive_backup_commit,
2241 .abort = drive_backup_abort,
2242 .clean = drive_backup_clean,
2244 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2245 .instance_size = sizeof(BlockdevBackupState),
2246 .prepare = blockdev_backup_prepare,
2247 .commit = blockdev_backup_commit,
2248 .abort = blockdev_backup_abort,
2249 .clean = blockdev_backup_clean,
2251 [TRANSACTION_ACTION_KIND_ABORT] = {
2252 .instance_size = sizeof(BlkActionState),
2253 .prepare = abort_prepare,
2254 .commit = abort_commit,
2256 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2257 .instance_size = sizeof(InternalSnapshotState),
2258 .prepare = internal_snapshot_prepare,
2259 .abort = internal_snapshot_abort,
2260 .clean = internal_snapshot_clean,
2262 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2263 .instance_size = sizeof(BlockDirtyBitmapState),
2264 .prepare = block_dirty_bitmap_add_prepare,
2265 .abort = block_dirty_bitmap_add_abort,
2267 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2268 .instance_size = sizeof(BlockDirtyBitmapState),
2269 .prepare = block_dirty_bitmap_clear_prepare,
2270 .commit = block_dirty_bitmap_free_backup,
2271 .abort = block_dirty_bitmap_restore,
2273 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = {
2274 .instance_size = sizeof(BlockDirtyBitmapState),
2275 .prepare = block_dirty_bitmap_enable_prepare,
2276 .abort = block_dirty_bitmap_enable_abort,
2278 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = {
2279 .instance_size = sizeof(BlockDirtyBitmapState),
2280 .prepare = block_dirty_bitmap_disable_prepare,
2281 .abort = block_dirty_bitmap_disable_abort,
2283 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = {
2284 .instance_size = sizeof(BlockDirtyBitmapState),
2285 .prepare = block_dirty_bitmap_merge_prepare,
2286 .commit = block_dirty_bitmap_free_backup,
2287 .abort = block_dirty_bitmap_restore,
2289 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE] = {
2290 .instance_size = sizeof(BlockDirtyBitmapState),
2291 .prepare = block_dirty_bitmap_remove_prepare,
2292 .commit = block_dirty_bitmap_remove_commit,
2293 .abort = block_dirty_bitmap_remove_abort,
2295 /* Where are transactions for MIRROR, COMMIT and STREAM?
2296 * Although these blockjobs use transaction callbacks like the backup job,
2297 * these jobs do not necessarily adhere to transaction semantics.
2298 * These jobs may not fully undo all of their actions on abort, nor do they
2299 * necessarily work in transactions with more than one job in them.
2304 * Allocate a TransactionProperties structure if necessary, and fill
2305 * that structure with desired defaults if they are unset.
2307 static TransactionProperties *get_transaction_properties(
2308 TransactionProperties *props)
2311 props = g_new0(TransactionProperties, 1);
2314 if (!props->has_completion_mode) {
2315 props->has_completion_mode = true;
2316 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2323 * 'Atomic' group operations. The operations are performed as a set, and if
2324 * any fail then we roll back all operations in the group.
2326 void qmp_transaction(TransactionActionList *dev_list,
2328 struct TransactionProperties *props,
2331 TransactionActionList *dev_entry = dev_list;
2332 JobTxn *block_job_txn = NULL;
2333 BlkActionState *state, *next;
2334 Error *local_err = NULL;
2336 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states;
2337 QTAILQ_INIT(&snap_bdrv_states);
2339 /* Does this transaction get canceled as a group on failure?
2340 * If not, we don't really need to make a JobTxn.
2342 props = get_transaction_properties(props);
2343 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2344 block_job_txn = job_txn_new();
2347 /* drain all i/o before any operations */
2350 /* We don't do anything in this loop that commits us to the operations */
2351 while (NULL != dev_entry) {
2352 TransactionAction *dev_info = NULL;
2353 const BlkActionOps *ops;
2355 dev_info = dev_entry->value;
2356 dev_entry = dev_entry->next;
2358 assert(dev_info->type < ARRAY_SIZE(actions));
2360 ops = &actions[dev_info->type];
2361 assert(ops->instance_size > 0);
2363 state = g_malloc0(ops->instance_size);
2365 state->action = dev_info;
2366 state->block_job_txn = block_job_txn;
2367 state->txn_props = props;
2368 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2370 state->ops->prepare(state, &local_err);
2372 error_propagate(errp, local_err);
2373 goto delete_and_fail;
2377 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) {
2378 if (state->ops->commit) {
2379 state->ops->commit(state);
2387 /* failure, and it is all-or-none; roll back all operations */
2388 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) {
2389 if (state->ops->abort) {
2390 state->ops->abort(state);
2394 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2395 if (state->ops->clean) {
2396 state->ops->clean(state);
2401 qapi_free_TransactionProperties(props);
2403 job_txn_unref(block_job_txn);
2406 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2410 BdrvDirtyBitmap *bitmap;
2411 BlockDriverState *bs;
2412 BlockDirtyBitmapSha256 *ret = NULL;
2415 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2416 if (!bitmap || !bs) {
2420 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2421 if (sha256 == NULL) {
2425 ret = g_new(BlockDirtyBitmapSha256, 1);
2426 ret->sha256 = sha256;
2431 void coroutine_fn qmp_block_resize(bool has_device, const char *device,
2432 bool has_node_name, const char *node_name,
2433 int64_t size, Error **errp)
2435 Error *local_err = NULL;
2437 BlockDriverState *bs;
2438 AioContext *old_ctx;
2440 bs = bdrv_lookup_bs(has_device ? device : NULL,
2441 has_node_name ? node_name : NULL,
2444 error_propagate(errp, local_err);
2449 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2453 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2454 error_setg(errp, QERR_DEVICE_IN_USE, device);
2458 blk = blk_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp);
2464 bdrv_drained_begin(bs);
2467 old_ctx = bdrv_co_enter(bs);
2468 blk_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp);
2469 bdrv_co_leave(bs, old_ctx);
2472 bdrv_drained_end(bs);
2477 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
2478 bool has_base, const char *base,
2479 bool has_base_node, const char *base_node,
2480 bool has_backing_file, const char *backing_file,
2481 bool has_bottom, const char *bottom,
2482 bool has_speed, int64_t speed,
2483 bool has_on_error, BlockdevOnError on_error,
2484 bool has_filter_node_name, const char *filter_node_name,
2485 bool has_auto_finalize, bool auto_finalize,
2486 bool has_auto_dismiss, bool auto_dismiss,
2489 BlockDriverState *bs, *iter, *iter_end;
2490 BlockDriverState *base_bs = NULL;
2491 BlockDriverState *bottom_bs = NULL;
2492 AioContext *aio_context;
2493 Error *local_err = NULL;
2494 int job_flags = JOB_DEFAULT;
2496 if (has_base && has_base_node) {
2497 error_setg(errp, "'base' and 'base-node' cannot be specified "
2498 "at the same time");
2502 if (has_base && has_bottom) {
2503 error_setg(errp, "'base' and 'bottom' cannot be specified "
2504 "at the same time");
2508 if (has_bottom && has_base_node) {
2509 error_setg(errp, "'bottom' and 'base-node' cannot be specified "
2510 "at the same time");
2514 if (!has_on_error) {
2515 on_error = BLOCKDEV_ON_ERROR_REPORT;
2518 bs = bdrv_lookup_bs(device, device, errp);
2523 aio_context = bdrv_get_aio_context(bs);
2524 aio_context_acquire(aio_context);
2527 base_bs = bdrv_find_backing_image(bs, base);
2528 if (base_bs == NULL) {
2529 error_setg(errp, "Can't find '%s' in the backing chain", base);
2532 assert(bdrv_get_aio_context(base_bs) == aio_context);
2535 if (has_base_node) {
2536 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2540 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
2541 error_setg(errp, "Node '%s' is not a backing image of '%s'",
2545 assert(bdrv_get_aio_context(base_bs) == aio_context);
2546 bdrv_refresh_filename(base_bs);
2550 bottom_bs = bdrv_lookup_bs(NULL, bottom, errp);
2554 if (!bottom_bs->drv) {
2555 error_setg(errp, "Node '%s' is not open", bottom);
2558 if (bottom_bs->drv->is_filter) {
2559 error_setg(errp, "Node '%s' is a filter, use a non-filter node "
2560 "as 'bottom'", bottom);
2563 if (!bdrv_chain_contains(bs, bottom_bs)) {
2564 error_setg(errp, "Node '%s' is not in a chain starting from '%s'",
2568 assert(bdrv_get_aio_context(bottom_bs) == aio_context);
2572 * Check for op blockers in the whole chain between bs and base (or bottom)
2574 iter_end = has_bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs;
2575 for (iter = bs; iter && iter != iter_end;
2576 iter = bdrv_filter_or_cow_bs(iter))
2578 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
2583 /* if we are streaming the entire chain, the result will have no backing
2584 * file, and specifying one is therefore an error */
2585 if (base_bs == NULL && has_backing_file) {
2586 error_setg(errp, "backing file specified, but streaming the "
2591 if (has_auto_finalize && !auto_finalize) {
2592 job_flags |= JOB_MANUAL_FINALIZE;
2594 if (has_auto_dismiss && !auto_dismiss) {
2595 job_flags |= JOB_MANUAL_DISMISS;
2598 stream_start(has_job_id ? job_id : NULL, bs, base_bs, backing_file,
2599 bottom_bs, job_flags, has_speed ? speed : 0, on_error,
2600 filter_node_name, &local_err);
2602 error_propagate(errp, local_err);
2606 trace_qmp_block_stream(bs);
2609 aio_context_release(aio_context);
2612 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
2613 bool has_base_node, const char *base_node,
2614 bool has_base, const char *base,
2615 bool has_top_node, const char *top_node,
2616 bool has_top, const char *top,
2617 bool has_backing_file, const char *backing_file,
2618 bool has_speed, int64_t speed,
2619 bool has_on_error, BlockdevOnError on_error,
2620 bool has_filter_node_name, const char *filter_node_name,
2621 bool has_auto_finalize, bool auto_finalize,
2622 bool has_auto_dismiss, bool auto_dismiss,
2625 BlockDriverState *bs;
2626 BlockDriverState *iter;
2627 BlockDriverState *base_bs, *top_bs;
2628 AioContext *aio_context;
2629 Error *local_err = NULL;
2630 int job_flags = JOB_DEFAULT;
2631 uint64_t top_perm, top_shared;
2636 if (!has_on_error) {
2637 on_error = BLOCKDEV_ON_ERROR_REPORT;
2639 if (!has_filter_node_name) {
2640 filter_node_name = NULL;
2642 if (has_auto_finalize && !auto_finalize) {
2643 job_flags |= JOB_MANUAL_FINALIZE;
2645 if (has_auto_dismiss && !auto_dismiss) {
2646 job_flags |= JOB_MANUAL_DISMISS;
2650 * libvirt relies on the DeviceNotFound error class in order to probe for
2651 * live commit feature versions; for this to work, we must make sure to
2652 * perform the device lookup before any generic errors that may occur in a
2653 * scenario in which all optional arguments are omitted. */
2654 bs = qmp_get_root_bs(device, &local_err);
2656 bs = bdrv_lookup_bs(device, device, NULL);
2658 error_free(local_err);
2659 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2660 "Device '%s' not found", device);
2662 error_propagate(errp, local_err);
2667 aio_context = bdrv_get_aio_context(bs);
2668 aio_context_acquire(aio_context);
2670 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2674 /* default top_bs is the active layer */
2677 if (has_top_node && has_top) {
2678 error_setg(errp, "'top-node' and 'top' are mutually exclusive");
2680 } else if (has_top_node) {
2681 top_bs = bdrv_lookup_bs(NULL, top_node, errp);
2682 if (top_bs == NULL) {
2685 if (!bdrv_chain_contains(bs, top_bs)) {
2686 error_setg(errp, "'%s' is not in this backing file chain",
2690 } else if (has_top && top) {
2691 /* This strcmp() is just a shortcut, there is no need to
2692 * refresh @bs's filename. If it mismatches,
2693 * bdrv_find_backing_image() will do the refresh and may still
2695 if (strcmp(bs->filename, top) != 0) {
2696 top_bs = bdrv_find_backing_image(bs, top);
2700 if (top_bs == NULL) {
2701 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2705 assert(bdrv_get_aio_context(top_bs) == aio_context);
2707 if (has_base_node && has_base) {
2708 error_setg(errp, "'base-node' and 'base' are mutually exclusive");
2710 } else if (has_base_node) {
2711 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2712 if (base_bs == NULL) {
2715 if (!bdrv_chain_contains(top_bs, base_bs)) {
2716 error_setg(errp, "'%s' is not in this backing file chain",
2720 } else if (has_base && base) {
2721 base_bs = bdrv_find_backing_image(top_bs, base);
2722 if (base_bs == NULL) {
2723 error_setg(errp, "Can't find '%s' in the backing chain", base);
2727 base_bs = bdrv_find_base(top_bs);
2728 if (base_bs == NULL) {
2729 error_setg(errp, "There is no backimg image");
2734 assert(bdrv_get_aio_context(base_bs) == aio_context);
2736 for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs);
2737 iter = bdrv_filter_or_cow_bs(iter))
2739 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2744 /* Do not allow attempts to commit an image into itself */
2745 if (top_bs == base_bs) {
2746 error_setg(errp, "cannot commit an image into itself");
2751 * Active commit is required if and only if someone has taken a
2752 * WRITE permission on the top node. Historically, we have always
2753 * used active commit for top nodes, so continue that practice
2754 * lest we possibly break clients that rely on this behavior, e.g.
2755 * to later attach this node to a writing parent.
2756 * (Active commit is never really wrong.)
2758 bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared);
2759 if (top_perm & BLK_PERM_WRITE ||
2760 bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs))
2762 if (has_backing_file) {
2763 if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) {
2764 error_setg(errp, "'backing-file' specified,"
2765 " but 'top' is the active layer");
2767 error_setg(errp, "'backing-file' specified, but 'top' has a "
2774 * Emulate here what block_job_create() does, because it
2775 * is possible that @bs != @top_bs (the block job should
2776 * be named after @bs, even if @top_bs is the actual
2779 job_id = bdrv_get_device_name(bs);
2781 commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error,
2782 filter_node_name, NULL, NULL, false, &local_err);
2784 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
2785 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2788 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags,
2789 speed, on_error, has_backing_file ? backing_file : NULL,
2790 filter_node_name, &local_err);
2792 if (local_err != NULL) {
2793 error_propagate(errp, local_err);
2798 aio_context_release(aio_context);
2801 /* Common QMP interface for drive-backup and blockdev-backup */
2802 static BlockJob *do_backup_common(BackupCommon *backup,
2803 BlockDriverState *bs,
2804 BlockDriverState *target_bs,
2805 AioContext *aio_context,
2806 JobTxn *txn, Error **errp)
2808 BlockJob *job = NULL;
2809 BdrvDirtyBitmap *bmap = NULL;
2810 BackupPerf perf = { .max_workers = 64 };
2811 int job_flags = JOB_DEFAULT;
2813 if (!backup->has_speed) {
2816 if (!backup->has_on_source_error) {
2817 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2819 if (!backup->has_on_target_error) {
2820 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2822 if (!backup->has_job_id) {
2823 backup->job_id = NULL;
2825 if (!backup->has_auto_finalize) {
2826 backup->auto_finalize = true;
2828 if (!backup->has_auto_dismiss) {
2829 backup->auto_dismiss = true;
2831 if (!backup->has_compress) {
2832 backup->compress = false;
2835 if (backup->x_perf) {
2836 if (backup->x_perf->has_use_copy_range) {
2837 perf.use_copy_range = backup->x_perf->use_copy_range;
2839 if (backup->x_perf->has_max_workers) {
2840 perf.max_workers = backup->x_perf->max_workers;
2842 if (backup->x_perf->has_max_chunk) {
2843 perf.max_chunk = backup->x_perf->max_chunk;
2847 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) ||
2848 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) {
2849 /* done before desugaring 'incremental' to print the right message */
2850 if (!backup->has_bitmap) {
2851 error_setg(errp, "must provide a valid bitmap name for "
2852 "'%s' sync mode", MirrorSyncMode_str(backup->sync));
2857 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) {
2858 if (backup->has_bitmap_mode &&
2859 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) {
2860 error_setg(errp, "Bitmap sync mode must be '%s' "
2861 "when using sync mode '%s'",
2862 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS),
2863 MirrorSyncMode_str(backup->sync));
2866 backup->has_bitmap_mode = true;
2867 backup->sync = MIRROR_SYNC_MODE_BITMAP;
2868 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS;
2871 if (backup->has_bitmap) {
2872 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
2874 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
2877 if (!backup->has_bitmap_mode) {
2878 error_setg(errp, "Bitmap sync mode must be given "
2879 "when providing a bitmap");
2882 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2886 /* This does not produce a useful bitmap artifact: */
2887 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
2888 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap"
2889 " outputs", MirrorSyncMode_str(backup->sync));
2893 /* If the bitmap isn't used for input or output, this is useless: */
2894 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER &&
2895 backup->sync != MIRROR_SYNC_MODE_BITMAP) {
2896 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect"
2897 " when combined with sync mode '%s'",
2898 BitmapSyncMode_str(backup->bitmap_mode),
2899 MirrorSyncMode_str(backup->sync));
2904 if (!backup->has_bitmap && backup->has_bitmap_mode) {
2905 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap");
2909 if (!backup->auto_finalize) {
2910 job_flags |= JOB_MANUAL_FINALIZE;
2912 if (!backup->auto_dismiss) {
2913 job_flags |= JOB_MANUAL_DISMISS;
2916 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
2917 backup->sync, bmap, backup->bitmap_mode,
2919 backup->filter_node_name,
2921 backup->on_source_error,
2922 backup->on_target_error,
2923 job_flags, NULL, NULL, txn, errp);
2927 void qmp_drive_backup(DriveBackup *backup, Error **errp)
2929 TransactionAction action = {
2930 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP,
2931 .u.drive_backup.data = backup,
2933 blockdev_do_action(&action, errp);
2936 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat,
2940 bool return_flat = has_flat && flat;
2942 return bdrv_named_nodes_list(return_flat, errp);
2945 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
2947 return bdrv_get_xdbg_block_graph(errp);
2950 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp)
2952 TransactionAction action = {
2953 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP,
2954 .u.blockdev_backup.data = backup,
2956 blockdev_do_action(&action, errp);
2959 /* Parameter check and block job starting for drive mirroring.
2960 * Caller should hold @device and @target's aio context (must be the same).
2962 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
2963 BlockDriverState *target,
2964 bool has_replaces, const char *replaces,
2965 enum MirrorSyncMode sync,
2966 BlockMirrorBackingMode backing_mode,
2968 bool has_speed, int64_t speed,
2969 bool has_granularity, uint32_t granularity,
2970 bool has_buf_size, int64_t buf_size,
2971 bool has_on_source_error,
2972 BlockdevOnError on_source_error,
2973 bool has_on_target_error,
2974 BlockdevOnError on_target_error,
2975 bool has_unmap, bool unmap,
2976 bool has_filter_node_name,
2977 const char *filter_node_name,
2978 bool has_copy_mode, MirrorCopyMode copy_mode,
2979 bool has_auto_finalize, bool auto_finalize,
2980 bool has_auto_dismiss, bool auto_dismiss,
2983 BlockDriverState *unfiltered_bs;
2984 int job_flags = JOB_DEFAULT;
2989 if (!has_on_source_error) {
2990 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2992 if (!has_on_target_error) {
2993 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2995 if (!has_granularity) {
2998 if (!has_buf_size) {
3004 if (!has_filter_node_name) {
3005 filter_node_name = NULL;
3007 if (!has_copy_mode) {
3008 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
3010 if (has_auto_finalize && !auto_finalize) {
3011 job_flags |= JOB_MANUAL_FINALIZE;
3013 if (has_auto_dismiss && !auto_dismiss) {
3014 job_flags |= JOB_MANUAL_DISMISS;
3017 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3018 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3019 "a value in range [512B, 64MB]");
3022 if (granularity & (granularity - 1)) {
3023 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3028 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3031 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3035 if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) {
3036 sync = MIRROR_SYNC_MODE_FULL;
3039 if (!has_replaces) {
3040 /* We want to mirror from @bs, but keep implicit filters on top */
3041 unfiltered_bs = bdrv_skip_implicit_filters(bs);
3042 if (unfiltered_bs != bs) {
3043 replaces = unfiltered_bs->node_name;
3044 has_replaces = true;
3049 BlockDriverState *to_replace_bs;
3050 AioContext *replace_aio_context;
3051 int64_t bs_size, replace_size;
3053 bs_size = bdrv_getlength(bs);
3055 error_setg_errno(errp, -bs_size, "Failed to query device's size");
3059 to_replace_bs = check_to_replace_node(bs, replaces, errp);
3060 if (!to_replace_bs) {
3064 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3065 aio_context_acquire(replace_aio_context);
3066 replace_size = bdrv_getlength(to_replace_bs);
3067 aio_context_release(replace_aio_context);
3069 if (replace_size < 0) {
3070 error_setg_errno(errp, -replace_size,
3071 "Failed to query the replacement node's size");
3074 if (bs_size != replace_size) {
3075 error_setg(errp, "cannot replace image with a mirror image of "
3081 /* pass the node name to replace to mirror start since it's loose coupling
3082 * and will allow to check whether the node still exist at mirror completion
3084 mirror_start(job_id, bs, target,
3085 has_replaces ? replaces : NULL, job_flags,
3086 speed, granularity, buf_size, sync, backing_mode, zero_target,
3087 on_source_error, on_target_error, unmap, filter_node_name,
3091 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3093 BlockDriverState *bs;
3094 BlockDriverState *target_backing_bs, *target_bs;
3095 AioContext *aio_context;
3096 AioContext *old_context;
3097 BlockMirrorBackingMode backing_mode;
3098 Error *local_err = NULL;
3099 QDict *options = NULL;
3102 const char *format = arg->format;
3106 bs = qmp_get_root_bs(arg->device, errp);
3111 /* Early check to avoid creating target */
3112 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3116 aio_context = bdrv_get_aio_context(bs);
3117 aio_context_acquire(aio_context);
3119 if (!arg->has_mode) {
3120 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3123 if (!arg->has_format) {
3124 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3125 ? NULL : bs->drv->format_name);
3128 flags = bs->open_flags | BDRV_O_RDWR;
3129 target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs));
3130 if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) {
3131 arg->sync = MIRROR_SYNC_MODE_FULL;
3133 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3134 target_backing_bs = bs;
3137 size = bdrv_getlength(bs);
3139 error_setg_errno(errp, -size, "bdrv_getlength failed");
3143 if (arg->has_replaces) {
3144 if (!arg->has_node_name) {
3145 error_setg(errp, "a node-name must be provided when replacing a"
3146 " named node of the graph");
3151 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3152 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3154 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3157 /* Don't open backing image in create() */
3158 flags |= BDRV_O_NO_BACKING;
3160 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs)
3161 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3163 /* create new image w/o backing file */
3165 bdrv_img_create(arg->target, format,
3166 NULL, NULL, NULL, size, flags, false, &local_err);
3168 /* Implicit filters should not appear in the filename */
3169 BlockDriverState *explicit_backing =
3170 bdrv_skip_implicit_filters(target_backing_bs);
3172 switch (arg->mode) {
3173 case NEW_IMAGE_MODE_EXISTING:
3175 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3176 /* create new image with backing file */
3177 bdrv_refresh_filename(explicit_backing);
3178 bdrv_img_create(arg->target, format,
3179 explicit_backing->filename,
3180 explicit_backing->drv->format_name,
3181 NULL, size, flags, false, &local_err);
3189 error_propagate(errp, local_err);
3193 options = qdict_new();
3194 if (arg->has_node_name) {
3195 qdict_put_str(options, "node-name", arg->node_name);
3198 qdict_put_str(options, "driver", format);
3201 /* Mirroring takes care of copy-on-write using the source's backing
3204 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3209 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL &&
3210 (arg->mode == NEW_IMAGE_MODE_EXISTING ||
3211 !bdrv_has_zero_init(target_bs)));
3214 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
3215 old_context = bdrv_get_aio_context(target_bs);
3216 aio_context_release(aio_context);
3217 aio_context_acquire(old_context);
3219 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
3221 bdrv_unref(target_bs);
3222 aio_context_release(old_context);
3226 aio_context_release(old_context);
3227 aio_context_acquire(aio_context);
3229 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
3230 arg->has_replaces, arg->replaces, arg->sync,
3231 backing_mode, zero_target,
3232 arg->has_speed, arg->speed,
3233 arg->has_granularity, arg->granularity,
3234 arg->has_buf_size, arg->buf_size,
3235 arg->has_on_source_error, arg->on_source_error,
3236 arg->has_on_target_error, arg->on_target_error,
3237 arg->has_unmap, arg->unmap,
3239 arg->has_copy_mode, arg->copy_mode,
3240 arg->has_auto_finalize, arg->auto_finalize,
3241 arg->has_auto_dismiss, arg->auto_dismiss,
3243 bdrv_unref(target_bs);
3245 aio_context_release(aio_context);
3248 void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
3249 const char *device, const char *target,
3250 bool has_replaces, const char *replaces,
3251 MirrorSyncMode sync,
3252 bool has_speed, int64_t speed,
3253 bool has_granularity, uint32_t granularity,
3254 bool has_buf_size, int64_t buf_size,
3255 bool has_on_source_error,
3256 BlockdevOnError on_source_error,
3257 bool has_on_target_error,
3258 BlockdevOnError on_target_error,
3259 bool has_filter_node_name,
3260 const char *filter_node_name,
3261 bool has_copy_mode, MirrorCopyMode copy_mode,
3262 bool has_auto_finalize, bool auto_finalize,
3263 bool has_auto_dismiss, bool auto_dismiss,
3266 BlockDriverState *bs;
3267 BlockDriverState *target_bs;
3268 AioContext *aio_context;
3269 AioContext *old_context;
3270 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3274 bs = qmp_get_root_bs(device, errp);
3279 target_bs = bdrv_lookup_bs(target, target, errp);
3284 zero_target = (sync == MIRROR_SYNC_MODE_FULL);
3286 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
3287 old_context = bdrv_get_aio_context(target_bs);
3288 aio_context = bdrv_get_aio_context(bs);
3289 aio_context_acquire(old_context);
3291 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
3293 aio_context_release(old_context);
3294 aio_context_acquire(aio_context);
3300 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3301 has_replaces, replaces, sync, backing_mode,
3302 zero_target, has_speed, speed,
3303 has_granularity, granularity,
3304 has_buf_size, buf_size,
3305 has_on_source_error, on_source_error,
3306 has_on_target_error, on_target_error,
3308 has_filter_node_name, filter_node_name,
3309 has_copy_mode, copy_mode,
3310 has_auto_finalize, auto_finalize,
3311 has_auto_dismiss, auto_dismiss,
3314 aio_context_release(aio_context);
3317 /* Get a block job using its ID and acquire its AioContext */
3318 static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3325 *aio_context = NULL;
3327 job = block_job_get(id);
3330 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3331 "Block job '%s' not found", id);
3335 *aio_context = blk_get_aio_context(job->blk);
3336 aio_context_acquire(*aio_context);
3341 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3343 AioContext *aio_context;
3344 BlockJob *job = find_block_job(device, &aio_context, errp);
3350 block_job_set_speed(job, speed, errp);
3351 aio_context_release(aio_context);
3354 void qmp_block_job_cancel(const char *device,
3355 bool has_force, bool force, Error **errp)
3357 AioContext *aio_context;
3358 BlockJob *job = find_block_job(device, &aio_context, errp);
3368 if (job_user_paused(&job->job) && !force) {
3369 error_setg(errp, "The block job for device '%s' is currently paused",
3374 trace_qmp_block_job_cancel(job);
3375 job_user_cancel(&job->job, force, errp);
3377 aio_context_release(aio_context);
3380 void qmp_block_job_pause(const char *device, Error **errp)
3382 AioContext *aio_context;
3383 BlockJob *job = find_block_job(device, &aio_context, errp);
3389 trace_qmp_block_job_pause(job);
3390 job_user_pause(&job->job, errp);
3391 aio_context_release(aio_context);
3394 void qmp_block_job_resume(const char *device, Error **errp)
3396 AioContext *aio_context;
3397 BlockJob *job = find_block_job(device, &aio_context, errp);
3403 trace_qmp_block_job_resume(job);
3404 job_user_resume(&job->job, errp);
3405 aio_context_release(aio_context);
3408 void qmp_block_job_complete(const char *device, Error **errp)
3410 AioContext *aio_context;
3411 BlockJob *job = find_block_job(device, &aio_context, errp);
3417 trace_qmp_block_job_complete(job);
3418 job_complete(&job->job, errp);
3419 aio_context_release(aio_context);
3422 void qmp_block_job_finalize(const char *id, Error **errp)
3424 AioContext *aio_context;
3425 BlockJob *job = find_block_job(id, &aio_context, errp);
3431 trace_qmp_block_job_finalize(job);
3433 job_finalize(&job->job, errp);
3436 * Job's context might have changed via job_finalize (and job_txn_apply
3437 * automatically acquires the new one), so make sure we release the correct
3440 aio_context = blk_get_aio_context(job->blk);
3441 job_unref(&job->job);
3442 aio_context_release(aio_context);
3445 void qmp_block_job_dismiss(const char *id, Error **errp)
3447 AioContext *aio_context;
3448 BlockJob *bjob = find_block_job(id, &aio_context, errp);
3455 trace_qmp_block_job_dismiss(bjob);
3457 job_dismiss(&job, errp);
3458 aio_context_release(aio_context);
3461 void qmp_change_backing_file(const char *device,
3462 const char *image_node_name,
3463 const char *backing_file,
3466 BlockDriverState *bs = NULL;
3467 AioContext *aio_context;
3468 BlockDriverState *image_bs = NULL;
3469 Error *local_err = NULL;
3473 bs = qmp_get_root_bs(device, errp);
3478 aio_context = bdrv_get_aio_context(bs);
3479 aio_context_acquire(aio_context);
3481 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3483 error_propagate(errp, local_err);
3488 error_setg(errp, "image file not found");
3492 if (bdrv_find_base(image_bs) == image_bs) {
3493 error_setg(errp, "not allowing backing file change on an image "
3494 "without a backing file");
3498 /* even though we are not necessarily operating on bs, we need it to
3499 * determine if block ops are currently prohibited on the chain */
3500 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3504 /* final sanity check */
3505 if (!bdrv_chain_contains(bs, image_bs)) {
3506 error_setg(errp, "'%s' and image file are not in the same chain",
3511 /* if not r/w, reopen to make r/w */
3512 ro = bdrv_is_read_only(image_bs);
3515 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) {
3520 ret = bdrv_change_backing_file(image_bs, backing_file,
3521 image_bs->drv ? image_bs->drv->format_name : "",
3525 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3527 /* don't exit here, so we can try to restore open flags if
3532 bdrv_reopen_set_read_only(image_bs, true, errp);
3536 aio_context_release(aio_context);
3539 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3541 BlockDriverState *bs;
3543 Visitor *v = qobject_output_visitor_new(&obj);
3546 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3547 visit_complete(v, &obj);
3548 qdict = qobject_to(QDict, obj);
3550 qdict_flatten(qdict);
3552 if (!qdict_get_try_str(qdict, "node-name")) {
3553 error_setg(errp, "'node-name' must be specified for the root node");
3557 bs = bds_tree_init(qdict, errp);
3562 bdrv_set_monitor_owned(bs);
3568 void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp)
3570 BlockDriverState *bs;
3573 Visitor *v = qobject_output_visitor_new(&obj);
3574 BlockReopenQueue *queue;
3577 /* Check for the selected node name */
3578 if (!options->has_node_name) {
3579 error_setg(errp, "node-name not specified");
3583 bs = bdrv_find_node(options->node_name);
3585 error_setg(errp, "Failed to find node with node-name='%s'",
3586 options->node_name);
3590 /* Put all options in a QDict and flatten it */
3591 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3592 visit_complete(v, &obj);
3593 qdict = qobject_to(QDict, obj);
3595 qdict_flatten(qdict);
3597 /* Perform the reopen operation */
3598 ctx = bdrv_get_aio_context(bs);
3599 aio_context_acquire(ctx);
3600 bdrv_subtree_drained_begin(bs);
3601 queue = bdrv_reopen_queue(NULL, bs, qdict, false);
3602 bdrv_reopen_multiple(queue, errp);
3603 bdrv_subtree_drained_end(bs);
3604 aio_context_release(ctx);
3610 void qmp_blockdev_del(const char *node_name, Error **errp)
3612 AioContext *aio_context;
3613 BlockDriverState *bs;
3615 bs = bdrv_find_node(node_name);
3617 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3620 if (bdrv_has_blk(bs)) {
3621 error_setg(errp, "Node %s is in use", node_name);
3624 aio_context = bdrv_get_aio_context(bs);
3625 aio_context_acquire(aio_context);
3627 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
3631 if (!QTAILQ_IN_USE(bs, monitor_list)) {
3632 error_setg(errp, "Node %s is not owned by the monitor",
3637 if (bs->refcnt > 1) {
3638 error_setg(errp, "Block device %s is in use",
3639 bdrv_get_device_or_node_name(bs));
3643 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3647 aio_context_release(aio_context);
3650 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
3651 const char *child_name)
3655 QLIST_FOREACH(child, &parent_bs->children, next) {
3656 if (strcmp(child->name, child_name) == 0) {
3664 void qmp_x_blockdev_change(const char *parent, bool has_child,
3665 const char *child, bool has_node,
3666 const char *node, Error **errp)
3668 BlockDriverState *parent_bs, *new_bs = NULL;
3671 parent_bs = bdrv_lookup_bs(parent, parent, errp);
3676 if (has_child == has_node) {
3678 error_setg(errp, "The parameters child and node are in conflict");
3680 error_setg(errp, "Either child or node must be specified");
3686 p_child = bdrv_find_child(parent_bs, child);
3688 error_setg(errp, "Node '%s' does not have child '%s'",
3692 bdrv_del_child(parent_bs, p_child, errp);
3696 new_bs = bdrv_find_node(node);
3698 error_setg(errp, "Node '%s' not found", node);
3701 bdrv_add_child(parent_bs, new_bs, errp);
3705 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3707 BlockJobInfoList *head = NULL, **tail = &head;
3710 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
3711 BlockJobInfo *value;
3712 AioContext *aio_context;
3714 if (block_job_is_internal(job)) {
3717 aio_context = blk_get_aio_context(job->blk);
3718 aio_context_acquire(aio_context);
3719 value = block_job_query(job, errp);
3720 aio_context_release(aio_context);
3722 qapi_free_BlockJobInfoList(head);
3725 QAPI_LIST_APPEND(tail, value);
3731 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
3732 bool has_force, bool force, Error **errp)
3734 AioContext *old_context;
3735 AioContext *new_context;
3736 BlockDriverState *bs;
3738 bs = bdrv_find_node(node_name);
3740 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3744 /* Protects against accidents. */
3745 if (!(has_force && force) && bdrv_has_blk(bs)) {
3746 error_setg(errp, "Node %s is associated with a BlockBackend and could "
3747 "be in use (use force=true to override this check)",
3752 if (iothread->type == QTYPE_QSTRING) {
3753 IOThread *obj = iothread_by_id(iothread->u.s);
3755 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
3759 new_context = iothread_get_aio_context(obj);
3761 new_context = qemu_get_aio_context();
3764 old_context = bdrv_get_aio_context(bs);
3765 aio_context_acquire(old_context);
3767 bdrv_try_set_aio_context(bs, new_context, errp);
3769 aio_context_release(old_context);
3772 QemuOptsList qemu_common_drive_opts = {
3774 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3778 .type = QEMU_OPT_BOOL,
3779 .help = "enable/disable snapshot mode",
3782 .type = QEMU_OPT_STRING,
3783 .help = "host AIO implementation (threads, native, io_uring)",
3785 .name = BDRV_OPT_CACHE_WB,
3786 .type = QEMU_OPT_BOOL,
3787 .help = "Enable writeback mode",
3790 .type = QEMU_OPT_STRING,
3791 .help = "disk format (raw, qcow2, ...)",
3794 .type = QEMU_OPT_STRING,
3795 .help = "read error action",
3798 .type = QEMU_OPT_STRING,
3799 .help = "write error action",
3801 .name = BDRV_OPT_READ_ONLY,
3802 .type = QEMU_OPT_BOOL,
3803 .help = "open drive file as read-only",
3809 .name = "throttling.group",
3810 .type = QEMU_OPT_STRING,
3811 .help = "name of the block throttling group",
3813 .name = "copy-on-read",
3814 .type = QEMU_OPT_BOOL,
3815 .help = "copy read data from backing file into image file",
3817 .name = "detect-zeroes",
3818 .type = QEMU_OPT_STRING,
3819 .help = "try to optimize zero writes (off, on, unmap)",
3821 .name = "stats-account-invalid",
3822 .type = QEMU_OPT_BOOL,
3823 .help = "whether to account for invalid I/O operations "
3824 "in the statistics",
3826 .name = "stats-account-failed",
3827 .type = QEMU_OPT_BOOL,
3828 .help = "whether to account for failed I/O operations "
3829 "in the statistics",
3831 { /* end of list */ }
3835 QemuOptsList qemu_drive_opts = {
3837 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3840 * no elements => accept any params
3841 * validation will happen later
3843 { /* end of list */ }