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/qtest.h"
61 #include "sysemu/runstate.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 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
68 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
70 static const char *const if_name[IF_COUNT] = {
74 [IF_FLOPPY] = "floppy",
75 [IF_PFLASH] = "pflash",
78 [IF_VIRTIO] = "virtio",
82 static int if_max_devs[IF_COUNT] = {
84 * Do not change these numbers! They govern how drive option
85 * index maps to unit and bus. That mapping is ABI.
87 * All controllers used to implement if=T drives need to support
88 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
89 * Otherwise, some index values map to "impossible" bus, unit
92 * For instance, if you change [IF_SCSI] to 255, -drive
93 * if=scsi,index=12 no longer means bus=1,unit=5, but
94 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
95 * the drive can't be set up. Regression.
102 * Boards may call this to offer board-by-board overrides
103 * of the default, global values.
105 void override_max_devs(BlockInterfaceType type, int max_devs)
114 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
115 dinfo = blk_legacy_dinfo(blk);
116 if (dinfo->type == type) {
117 fprintf(stderr, "Cannot override units-per-bus property of"
118 " the %s interface, because a drive of that type has"
119 " already been added.\n", if_name[type]);
120 g_assert_not_reached();
124 if_max_devs[type] = max_devs;
128 * We automatically delete the drive when a device using it gets
129 * unplugged. Questionable feature, but we can't just drop it.
130 * Device models call blockdev_mark_auto_del() to schedule the
131 * automatic deletion, and generic qdev code calls blockdev_auto_del()
132 * when deletion is actually safe.
134 void blockdev_mark_auto_del(BlockBackend *blk)
136 DriveInfo *dinfo = blk_legacy_dinfo(blk);
143 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
144 if (block_job_has_bdrv(job, blk_bs(blk))) {
145 AioContext *aio_context = job->job.aio_context;
146 aio_context_acquire(aio_context);
148 job_cancel(&job->job, false);
150 aio_context_release(aio_context);
157 void blockdev_auto_del(BlockBackend *blk)
159 DriveInfo *dinfo = blk_legacy_dinfo(blk);
161 if (dinfo && dinfo->auto_del) {
162 monitor_remove_blk(blk);
168 * Returns the current mapping of how many units per bus
169 * a particular interface can support.
171 * A positive integer indicates n units per bus.
172 * 0 implies the mapping has not been established.
173 * -1 indicates an invalid BlockInterfaceType was given.
175 int drive_get_max_devs(BlockInterfaceType type)
177 if (type >= IF_IDE && type < IF_COUNT) {
178 return if_max_devs[type];
184 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
186 int max_devs = if_max_devs[type];
187 return max_devs ? index / max_devs : 0;
190 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
192 int max_devs = if_max_devs[type];
193 return max_devs ? index % max_devs : index;
196 QemuOpts *drive_def(const char *optstr)
198 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
201 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
206 opts = drive_def(optstr);
210 if (type != IF_DEFAULT) {
211 qemu_opt_set(opts, "if", if_name[type], &error_abort);
214 qemu_opt_set_number(opts, "index", index, &error_abort);
217 qemu_opt_set(opts, "file", file, &error_abort);
221 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
226 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
227 dinfo = blk_legacy_dinfo(blk);
228 if (dinfo && dinfo->type == type
229 && dinfo->bus == bus && dinfo->unit == unit) {
237 void drive_check_orphaned(void)
242 bool orphans = false;
244 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
245 dinfo = blk_legacy_dinfo(blk);
246 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
247 dinfo->type != IF_NONE) {
249 qemu_opts_loc_restore(dinfo->opts);
250 error_report("machine type does not support"
251 " if=%s,bus=%d,unit=%d",
252 if_name[dinfo->type], dinfo->bus, dinfo->unit);
263 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
265 return drive_get(type,
266 drive_index_to_bus_id(type, index),
267 drive_index_to_unit_id(type, index));
270 int drive_get_max_bus(BlockInterfaceType type)
277 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
278 dinfo = blk_legacy_dinfo(blk);
279 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
280 max_bus = dinfo->bus;
286 /* Get a block device. This should only be used for single-drive devices
287 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
289 DriveInfo *drive_get_next(BlockInterfaceType type)
291 static int next_block_unit[IF_COUNT];
293 return drive_get(type, 0, next_block_unit[type]++);
296 static void bdrv_format_print(void *opaque, const char *name)
298 qemu_printf(" %s", name);
303 BlockDriverState *bs;
306 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
308 if (!strcmp(buf, "ignore")) {
309 return BLOCKDEV_ON_ERROR_IGNORE;
310 } else if (!is_read && !strcmp(buf, "enospc")) {
311 return BLOCKDEV_ON_ERROR_ENOSPC;
312 } else if (!strcmp(buf, "stop")) {
313 return BLOCKDEV_ON_ERROR_STOP;
314 } else if (!strcmp(buf, "report")) {
315 return BLOCKDEV_ON_ERROR_REPORT;
317 error_setg(errp, "'%s' invalid %s error action",
318 buf, is_read ? "read" : "write");
323 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
326 const QListEntry *entry;
327 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
328 switch (qobject_type(entry->value)) {
330 case QTYPE_QSTRING: {
331 unsigned long long length;
332 const char *str = qstring_get_str(qobject_to(QString,
334 if (parse_uint_full(str, &length, 10) == 0 &&
335 length > 0 && length <= UINT_MAX) {
336 block_acct_add_interval(stats, (unsigned) length);
338 error_setg(errp, "Invalid interval length: %s", str);
345 int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
347 if (length > 0 && length <= UINT_MAX) {
348 block_acct_add_interval(stats, (unsigned) length);
350 error_setg(errp, "Invalid interval length: %" PRId64, length);
357 error_setg(errp, "The specification of stats-intervals is invalid");
364 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
366 /* All parameters but @opts are optional and may be set to NULL. */
367 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
368 const char **throttling_group, ThrottleConfig *throttle_cfg,
369 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
371 Error *local_error = NULL;
375 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
376 *bdrv_flags |= BDRV_O_COPY_ON_READ;
379 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
380 if (bdrv_parse_aio(aio, bdrv_flags) < 0) {
381 error_setg(errp, "invalid aio option");
387 /* disk I/O throttling */
388 if (throttling_group) {
389 *throttling_group = qemu_opt_get(opts, "throttling.group");
393 throttle_config_init(throttle_cfg);
394 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
395 qemu_opt_get_number(opts, "throttling.bps-total", 0);
396 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
397 qemu_opt_get_number(opts, "throttling.bps-read", 0);
398 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
399 qemu_opt_get_number(opts, "throttling.bps-write", 0);
400 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
401 qemu_opt_get_number(opts, "throttling.iops-total", 0);
402 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
403 qemu_opt_get_number(opts, "throttling.iops-read", 0);
404 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
405 qemu_opt_get_number(opts, "throttling.iops-write", 0);
407 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
408 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
409 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
410 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
411 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
412 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
413 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
414 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
415 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
416 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
417 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
418 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
420 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
421 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
422 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
423 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
424 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
425 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
426 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
427 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
428 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
429 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
430 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
431 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
433 throttle_cfg->op_size =
434 qemu_opt_get_number(opts, "throttling.iops-size", 0);
436 if (!throttle_is_valid(throttle_cfg, errp)) {
443 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
444 qemu_opt_get(opts, "detect-zeroes"),
445 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
448 error_propagate(errp, local_error);
454 /* Takes the ownership of bs_opts */
455 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
460 int on_read_error, on_write_error;
461 bool account_invalid, account_failed;
462 bool writethrough, read_only;
464 BlockDriverState *bs;
469 QDict *interval_dict = NULL;
470 QList *interval_list = NULL;
472 BlockdevDetectZeroesOptions detect_zeroes =
473 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
474 const char *throttling_group = NULL;
476 /* Check common options by copying from bs_opts to opts, all other options
477 * stay in bs_opts for processing by bdrv_open(). */
478 id = qdict_get_try_str(bs_opts, "id");
479 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
481 error_propagate(errp, error);
485 qemu_opts_absorb_qdict(opts, bs_opts, &error);
487 error_propagate(errp, error);
492 qdict_del(bs_opts, "id");
495 /* extract parameters */
496 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
498 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
499 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
501 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
503 id = qemu_opts_id(opts);
505 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
506 qdict_array_split(interval_dict, &interval_list);
508 if (qdict_size(interval_dict) != 0) {
509 error_setg(errp, "Invalid option stats-intervals.%s",
510 qdict_first(interval_dict)->key);
514 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
515 &detect_zeroes, &error);
517 error_propagate(errp, error);
521 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
522 if (is_help_option(buf)) {
523 qemu_printf("Supported formats:");
524 bdrv_iterate_format(bdrv_format_print, NULL, false);
525 qemu_printf("\nSupported formats (read-only):");
526 bdrv_iterate_format(bdrv_format_print, NULL, true);
531 if (qdict_haskey(bs_opts, "driver")) {
532 error_setg(errp, "Cannot specify both 'driver' and 'format'");
535 qdict_put_str(bs_opts, "driver", buf);
538 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
539 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
540 on_write_error = parse_block_error_action(buf, 0, &error);
542 error_propagate(errp, error);
547 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
548 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
549 on_read_error = parse_block_error_action(buf, 1, &error);
551 error_propagate(errp, error);
557 bdrv_flags |= BDRV_O_SNAPSHOT;
560 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
563 if ((!file || !*file) && !qdict_size(bs_opts)) {
564 BlockBackendRootState *blk_rs;
566 blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL);
567 blk_rs = blk_get_root_state(blk);
568 blk_rs->open_flags = bdrv_flags;
569 blk_rs->read_only = read_only;
570 blk_rs->detect_zeroes = detect_zeroes;
572 qobject_unref(bs_opts);
574 if (file && !*file) {
578 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
579 * with other callers) rather than what we want as the real defaults.
580 * Apply the defaults here instead. */
581 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
582 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
583 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
584 read_only ? "on" : "off");
585 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on");
586 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
588 if (runstate_check(RUN_STATE_INMIGRATE)) {
589 bdrv_flags |= BDRV_O_INACTIVE;
592 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
598 bs->detect_zeroes = detect_zeroes;
600 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
602 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
609 /* disk I/O throttling */
610 if (throttle_enabled(&cfg)) {
611 if (!throttling_group) {
612 throttling_group = id;
614 blk_io_limits_enable(blk, throttling_group);
615 blk_set_io_limits(blk, &cfg);
618 blk_set_enable_write_cache(blk, !writethrough);
619 blk_set_on_error(blk, on_read_error, on_write_error);
621 if (!monitor_add_blk(blk, id, errp)) {
629 qobject_unref(interval_dict);
630 qobject_unref(interval_list);
635 qobject_unref(interval_dict);
636 qobject_unref(interval_list);
638 qobject_unref(bs_opts);
642 /* Takes the ownership of bs_opts */
643 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
647 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
648 * with other callers) rather than what we want as the real defaults.
649 * Apply the defaults here instead. */
650 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
651 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
652 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
654 if (runstate_check(RUN_STATE_INMIGRATE)) {
655 bdrv_flags |= BDRV_O_INACTIVE;
658 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
661 void blockdev_close_all_bdrv_states(void)
663 BlockDriverState *bs, *next_bs;
665 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
666 AioContext *ctx = bdrv_get_aio_context(bs);
668 aio_context_acquire(ctx);
670 aio_context_release(ctx);
674 /* Iterates over the list of monitor-owned BlockDriverStates */
675 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
677 return bs ? QTAILQ_NEXT(bs, monitor_list)
678 : QTAILQ_FIRST(&monitor_bdrv_states);
681 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
686 value = qemu_opt_get(opts, from);
688 if (qemu_opt_find(opts, to)) {
689 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
690 "same time", to, from);
695 /* rename all items in opts */
696 while ((value = qemu_opt_get(opts, from))) {
697 qemu_opt_set(opts, to, value, &error_abort);
698 qemu_opt_unset(opts, from);
702 QemuOptsList qemu_legacy_drive_opts = {
704 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
708 .type = QEMU_OPT_NUMBER,
709 .help = "bus number",
712 .type = QEMU_OPT_NUMBER,
713 .help = "unit number (i.e. lun for scsi)",
716 .type = QEMU_OPT_NUMBER,
717 .help = "index number",
720 .type = QEMU_OPT_STRING,
721 .help = "media type (disk, cdrom)",
724 .type = QEMU_OPT_STRING,
725 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
728 .type = QEMU_OPT_STRING,
732 /* Options that are passed on, but have special semantics with -drive */
734 .name = BDRV_OPT_READ_ONLY,
735 .type = QEMU_OPT_BOOL,
736 .help = "open drive file as read-only",
739 .type = QEMU_OPT_STRING,
740 .help = "read error action",
743 .type = QEMU_OPT_STRING,
744 .help = "write error action",
746 .name = "copy-on-read",
747 .type = QEMU_OPT_BOOL,
748 .help = "copy read data from backing file into image file",
751 { /* end of list */ }
755 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type,
760 DriveInfo *dinfo = NULL;
762 QemuOpts *legacy_opts;
763 DriveMediaType media = MEDIA_DISK;
764 BlockInterfaceType type;
765 int max_devs, bus_id, unit_id, index;
766 const char *werror, *rerror;
767 bool read_only = false;
769 const char *filename;
770 Error *local_err = NULL;
773 /* Change legacy command line options into QMP ones */
774 static const struct {
778 { "iops", "throttling.iops-total" },
779 { "iops_rd", "throttling.iops-read" },
780 { "iops_wr", "throttling.iops-write" },
782 { "bps", "throttling.bps-total" },
783 { "bps_rd", "throttling.bps-read" },
784 { "bps_wr", "throttling.bps-write" },
786 { "iops_max", "throttling.iops-total-max" },
787 { "iops_rd_max", "throttling.iops-read-max" },
788 { "iops_wr_max", "throttling.iops-write-max" },
790 { "bps_max", "throttling.bps-total-max" },
791 { "bps_rd_max", "throttling.bps-read-max" },
792 { "bps_wr_max", "throttling.bps-write-max" },
794 { "iops_size", "throttling.iops-size" },
796 { "group", "throttling.group" },
798 { "readonly", BDRV_OPT_READ_ONLY },
801 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
802 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
805 error_propagate(errp, local_err);
810 value = qemu_opt_get(all_opts, "cache");
815 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
816 error_setg(errp, "invalid cache option");
820 /* Specific options take precedence */
821 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
822 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
823 !writethrough, &error_abort);
825 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
826 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
827 !!(flags & BDRV_O_NOCACHE), &error_abort);
829 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
830 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
831 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
833 qemu_opt_unset(all_opts, "cache");
836 /* Get a QDict for processing the options */
837 bs_opts = qdict_new();
838 qemu_opts_to_qdict(all_opts, bs_opts);
840 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
842 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
844 error_propagate(errp, local_err);
849 value = qemu_opt_get(legacy_opts, "media");
851 if (!strcmp(value, "disk")) {
853 } else if (!strcmp(value, "cdrom")) {
857 error_setg(errp, "'%s' invalid media", value);
862 /* copy-on-read is disabled with a warning for read-only devices */
863 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
864 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
866 if (read_only && copy_on_read) {
867 warn_report("disabling copy-on-read on read-only drive");
868 copy_on_read = false;
871 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
872 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
874 /* Controller type */
875 value = qemu_opt_get(legacy_opts, "if");
878 type < IF_COUNT && strcmp(value, if_name[type]);
881 if (type == IF_COUNT) {
882 error_setg(errp, "unsupported bus type '%s'", value);
886 type = block_default_type;
889 /* Device address specified by bus/unit or index.
890 * If none was specified, try to find the first free one. */
891 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
892 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
893 index = qemu_opt_get_number(legacy_opts, "index", -1);
895 max_devs = if_max_devs[type];
898 if (bus_id != 0 || unit_id != -1) {
899 error_setg(errp, "index cannot be used with bus and unit");
902 bus_id = drive_index_to_bus_id(type, index);
903 unit_id = drive_index_to_unit_id(type, index);
908 while (drive_get(type, bus_id, unit_id) != NULL) {
910 if (max_devs && unit_id >= max_devs) {
917 if (max_devs && unit_id >= max_devs) {
918 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1);
922 if (drive_get(type, bus_id, unit_id) != NULL) {
923 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists",
924 bus_id, unit_id, index);
928 /* no id supplied -> create one */
929 if (qemu_opts_id(all_opts) == NULL) {
931 const char *mediastr = "";
932 if (type == IF_IDE || type == IF_SCSI) {
933 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
936 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
939 new_id = g_strdup_printf("%s%s%i", if_name[type],
942 qdict_put_str(bs_opts, "id", new_id);
946 /* Add virtio block device */
947 if (type == IF_VIRTIO) {
949 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
951 if (arch_type == QEMU_ARCH_S390X) {
952 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
954 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
956 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
960 filename = qemu_opt_get(legacy_opts, "file");
962 /* Check werror/rerror compatibility with if=... */
963 werror = qemu_opt_get(legacy_opts, "werror");
964 if (werror != NULL) {
965 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
967 error_setg(errp, "werror is not supported by this bus type");
970 qdict_put_str(bs_opts, "werror", werror);
973 rerror = qemu_opt_get(legacy_opts, "rerror");
974 if (rerror != NULL) {
975 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
977 error_setg(errp, "rerror is not supported by this bus type");
980 qdict_put_str(bs_opts, "rerror", rerror);
983 /* Actual block device init: Functionality shared with blockdev-add */
984 blk = blockdev_init(filename, bs_opts, &local_err);
987 error_propagate(errp, local_err);
993 /* Create legacy DriveInfo */
994 dinfo = g_malloc0(sizeof(*dinfo));
995 dinfo->opts = all_opts;
999 dinfo->unit = unit_id;
1001 blk_set_legacy_dinfo(blk, dinfo);
1008 dinfo->media_cd = media == MEDIA_CDROM;
1015 qemu_opts_del(legacy_opts);
1016 qobject_unref(bs_opts);
1020 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1022 BlockDriverState *bs;
1024 bs = bdrv_lookup_bs(name, name, errp);
1029 if (!bdrv_is_root_node(bs)) {
1030 error_setg(errp, "Need a root block node");
1034 if (!bdrv_is_inserted(bs)) {
1035 error_setg(errp, "Device has no medium");
1042 void hmp_commit(Monitor *mon, const QDict *qdict)
1044 const char *device = qdict_get_str(qdict, "device");
1048 if (!strcmp(device, "all")) {
1049 ret = blk_commit_all();
1051 BlockDriverState *bs;
1052 AioContext *aio_context;
1054 blk = blk_by_name(device);
1056 error_report("Device '%s' not found", device);
1059 if (!blk_is_available(blk)) {
1060 error_report("Device '%s' has no medium", device);
1065 aio_context = bdrv_get_aio_context(bs);
1066 aio_context_acquire(aio_context);
1068 ret = bdrv_commit(bs);
1070 aio_context_release(aio_context);
1073 error_report("'commit' error for '%s': %s", device, strerror(-ret));
1077 static void blockdev_do_action(TransactionAction *action, Error **errp)
1079 TransactionActionList list;
1081 list.value = action;
1083 qmp_transaction(&list, false, NULL, errp);
1086 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1087 bool has_node_name, const char *node_name,
1088 const char *snapshot_file,
1089 bool has_snapshot_node_name,
1090 const char *snapshot_node_name,
1091 bool has_format, const char *format,
1092 bool has_mode, NewImageMode mode, Error **errp)
1094 BlockdevSnapshotSync snapshot = {
1095 .has_device = has_device,
1096 .device = (char *) device,
1097 .has_node_name = has_node_name,
1098 .node_name = (char *) node_name,
1099 .snapshot_file = (char *) snapshot_file,
1100 .has_snapshot_node_name = has_snapshot_node_name,
1101 .snapshot_node_name = (char *) snapshot_node_name,
1102 .has_format = has_format,
1103 .format = (char *) format,
1104 .has_mode = has_mode,
1107 TransactionAction action = {
1108 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1109 .u.blockdev_snapshot_sync.data = &snapshot,
1111 blockdev_do_action(&action, errp);
1114 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1117 BlockdevSnapshot snapshot_data = {
1118 .node = (char *) node,
1119 .overlay = (char *) overlay
1121 TransactionAction action = {
1122 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1123 .u.blockdev_snapshot.data = &snapshot_data,
1125 blockdev_do_action(&action, errp);
1128 void qmp_blockdev_snapshot_internal_sync(const char *device,
1132 BlockdevSnapshotInternal snapshot = {
1133 .device = (char *) device,
1134 .name = (char *) name
1136 TransactionAction action = {
1137 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1138 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1140 blockdev_do_action(&action, errp);
1143 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1150 BlockDriverState *bs;
1151 AioContext *aio_context;
1152 QEMUSnapshotInfo sn;
1153 Error *local_err = NULL;
1154 SnapshotInfo *info = NULL;
1157 bs = qmp_get_root_bs(device, errp);
1161 aio_context = bdrv_get_aio_context(bs);
1162 aio_context_acquire(aio_context);
1173 error_setg(errp, "Name or id must be provided");
1174 goto out_aio_context;
1177 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1178 goto out_aio_context;
1181 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1183 error_propagate(errp, local_err);
1184 goto out_aio_context;
1188 "Snapshot with id '%s' and name '%s' does not exist on "
1190 STR_OR_NULL(id), STR_OR_NULL(name), device);
1191 goto out_aio_context;
1194 bdrv_snapshot_delete(bs, id, name, &local_err);
1196 error_propagate(errp, local_err);
1197 goto out_aio_context;
1200 aio_context_release(aio_context);
1202 info = g_new0(SnapshotInfo, 1);
1203 info->id = g_strdup(sn.id_str);
1204 info->name = g_strdup(sn.name);
1205 info->date_nsec = sn.date_nsec;
1206 info->date_sec = sn.date_sec;
1207 info->vm_state_size = sn.vm_state_size;
1208 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1209 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1214 aio_context_release(aio_context);
1219 * block_dirty_bitmap_lookup:
1220 * Return a dirty bitmap (if present), after validating
1221 * the node reference and bitmap names.
1223 * @node: The name of the BDS node to search for bitmaps
1224 * @name: The name of the bitmap to search for
1225 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1226 * @errp: Output pointer for error information. Can be NULL.
1228 * @return: A bitmap object on success, or NULL on failure.
1230 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1232 BlockDriverState **pbs,
1235 BlockDriverState *bs;
1236 BdrvDirtyBitmap *bitmap;
1239 error_setg(errp, "Node cannot be NULL");
1243 error_setg(errp, "Bitmap name cannot be NULL");
1246 bs = bdrv_lookup_bs(node, node, NULL);
1248 error_setg(errp, "Node '%s' not found", node);
1252 bitmap = bdrv_find_dirty_bitmap(bs, name);
1254 error_setg(errp, "Dirty bitmap '%s' not found", name);
1265 /* New and old BlockDriverState structs for atomic group operations */
1267 typedef struct BlkActionState BlkActionState;
1271 * Table of operations that define an Action.
1273 * @instance_size: Size of state struct, in bytes.
1274 * @prepare: Prepare the work, must NOT be NULL.
1275 * @commit: Commit the changes, can be NULL.
1276 * @abort: Abort the changes on fail, can be NULL.
1277 * @clean: Clean up resources after all transaction actions have called
1278 * commit() or abort(). Can be NULL.
1280 * Only prepare() may fail. In a single transaction, only one of commit() or
1281 * abort() will be called. clean() will always be called if it is present.
1283 typedef struct BlkActionOps {
1284 size_t instance_size;
1285 void (*prepare)(BlkActionState *common, Error **errp);
1286 void (*commit)(BlkActionState *common);
1287 void (*abort)(BlkActionState *common);
1288 void (*clean)(BlkActionState *common);
1293 * Describes one Action's state within a Transaction.
1295 * @action: QAPI-defined enum identifying which Action to perform.
1296 * @ops: Table of ActionOps this Action can perform.
1297 * @block_job_txn: Transaction which this action belongs to.
1298 * @entry: List membership for all Actions in this Transaction.
1300 * This structure must be arranged as first member in a subclassed type,
1301 * assuming that the compiler will also arrange it to the same offsets as the
1304 struct BlkActionState {
1305 TransactionAction *action;
1306 const BlkActionOps *ops;
1307 JobTxn *block_job_txn;
1308 TransactionProperties *txn_props;
1309 QTAILQ_ENTRY(BlkActionState) entry;
1312 /* internal snapshot private data */
1313 typedef struct InternalSnapshotState {
1314 BlkActionState common;
1315 BlockDriverState *bs;
1316 QEMUSnapshotInfo sn;
1318 } InternalSnapshotState;
1321 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1323 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1325 "Action '%s' does not support Transaction property "
1326 "completion-mode = %s",
1327 TransactionActionKind_str(s->action->type),
1328 ActionCompletionMode_str(s->txn_props->completion_mode));
1334 static void internal_snapshot_prepare(BlkActionState *common,
1337 Error *local_err = NULL;
1340 BlockDriverState *bs;
1341 QEMUSnapshotInfo old_sn, *sn;
1344 BlockdevSnapshotInternal *internal;
1345 InternalSnapshotState *state;
1346 AioContext *aio_context;
1349 g_assert(common->action->type ==
1350 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1351 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1352 state = DO_UPCAST(InternalSnapshotState, common, common);
1354 /* 1. parse input */
1355 device = internal->device;
1356 name = internal->name;
1358 /* 2. check for validation */
1359 if (action_check_completion_mode(common, errp) < 0) {
1363 bs = qmp_get_root_bs(device, errp);
1368 aio_context = bdrv_get_aio_context(bs);
1369 aio_context_acquire(aio_context);
1373 /* Paired with .clean() */
1374 bdrv_drained_begin(bs);
1376 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1380 if (bdrv_is_read_only(bs)) {
1381 error_setg(errp, "Device '%s' is read only", device);
1385 if (!bdrv_can_snapshot(bs)) {
1386 error_setg(errp, "Block format '%s' used by device '%s' "
1387 "does not support internal snapshots",
1388 bs->drv->format_name, device);
1392 if (!strlen(name)) {
1393 error_setg(errp, "Name is empty");
1397 /* check whether a snapshot with name exist */
1398 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1401 error_propagate(errp, local_err);
1405 "Snapshot with name '%s' already exists on device '%s'",
1410 /* 3. take the snapshot */
1412 pstrcpy(sn->name, sizeof(sn->name), name);
1413 qemu_gettimeofday(&tv);
1414 sn->date_sec = tv.tv_sec;
1415 sn->date_nsec = tv.tv_usec * 1000;
1416 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1418 ret1 = bdrv_snapshot_create(bs, sn);
1420 error_setg_errno(errp, -ret1,
1421 "Failed to create snapshot '%s' on device '%s'",
1426 /* 4. succeed, mark a snapshot is created */
1427 state->created = true;
1430 aio_context_release(aio_context);
1433 static void internal_snapshot_abort(BlkActionState *common)
1435 InternalSnapshotState *state =
1436 DO_UPCAST(InternalSnapshotState, common, common);
1437 BlockDriverState *bs = state->bs;
1438 QEMUSnapshotInfo *sn = &state->sn;
1439 AioContext *aio_context;
1440 Error *local_error = NULL;
1442 if (!state->created) {
1446 aio_context = bdrv_get_aio_context(state->bs);
1447 aio_context_acquire(aio_context);
1449 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1450 error_reportf_err(local_error,
1451 "Failed to delete snapshot with id '%s' and "
1452 "name '%s' on device '%s' in abort: ",
1453 sn->id_str, sn->name,
1454 bdrv_get_device_name(bs));
1457 aio_context_release(aio_context);
1460 static void internal_snapshot_clean(BlkActionState *common)
1462 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1464 AioContext *aio_context;
1470 aio_context = bdrv_get_aio_context(state->bs);
1471 aio_context_acquire(aio_context);
1473 bdrv_drained_end(state->bs);
1475 aio_context_release(aio_context);
1478 /* external snapshot private data */
1479 typedef struct ExternalSnapshotState {
1480 BlkActionState common;
1481 BlockDriverState *old_bs;
1482 BlockDriverState *new_bs;
1483 bool overlay_appended;
1484 } ExternalSnapshotState;
1486 static void external_snapshot_prepare(BlkActionState *common,
1490 QDict *options = NULL;
1491 Error *local_err = NULL;
1492 /* Device and node name of the image to generate the snapshot from */
1494 const char *node_name;
1495 /* Reference to the new image (for 'blockdev-snapshot') */
1496 const char *snapshot_ref;
1497 /* File name of the new image (for 'blockdev-snapshot-sync') */
1498 const char *new_image_file;
1499 ExternalSnapshotState *state =
1500 DO_UPCAST(ExternalSnapshotState, common, common);
1501 TransactionAction *action = common->action;
1502 AioContext *aio_context;
1503 AioContext *old_context;
1506 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1507 * purpose but a different set of parameters */
1508 switch (action->type) {
1509 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1511 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1513 node_name = s->node;
1514 new_image_file = NULL;
1515 snapshot_ref = s->overlay;
1518 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1520 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1521 device = s->has_device ? s->device : NULL;
1522 node_name = s->has_node_name ? s->node_name : NULL;
1523 new_image_file = s->snapshot_file;
1524 snapshot_ref = NULL;
1528 g_assert_not_reached();
1531 /* start processing */
1532 if (action_check_completion_mode(common, errp) < 0) {
1536 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1537 if (!state->old_bs) {
1541 aio_context = bdrv_get_aio_context(state->old_bs);
1542 aio_context_acquire(aio_context);
1544 /* Paired with .clean() */
1545 bdrv_drained_begin(state->old_bs);
1547 if (!bdrv_is_inserted(state->old_bs)) {
1548 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1552 if (bdrv_op_is_blocked(state->old_bs,
1553 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1557 if (!bdrv_is_read_only(state->old_bs)) {
1558 if (bdrv_flush(state->old_bs)) {
1559 error_setg(errp, QERR_IO_ERROR);
1564 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1565 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1566 const char *format = s->has_format ? s->format : "qcow2";
1567 enum NewImageMode mode;
1568 const char *snapshot_node_name =
1569 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1571 if (node_name && !snapshot_node_name) {
1572 error_setg(errp, "New overlay node name missing");
1576 if (snapshot_node_name &&
1577 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1578 error_setg(errp, "New overlay node name already in use");
1582 flags = state->old_bs->open_flags;
1583 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1584 flags |= BDRV_O_NO_BACKING;
1586 /* create new image w/backing file */
1587 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1588 if (mode != NEW_IMAGE_MODE_EXISTING) {
1589 int64_t size = bdrv_getlength(state->old_bs);
1591 error_setg_errno(errp, -size, "bdrv_getlength failed");
1594 bdrv_refresh_filename(state->old_bs);
1595 bdrv_img_create(new_image_file, format,
1596 state->old_bs->filename,
1597 state->old_bs->drv->format_name,
1598 NULL, size, flags, false, &local_err);
1600 error_propagate(errp, local_err);
1605 options = qdict_new();
1606 if (snapshot_node_name) {
1607 qdict_put_str(options, "node-name", snapshot_node_name);
1609 qdict_put_str(options, "driver", format);
1612 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1614 /* We will manually add the backing_hd field to the bs later */
1615 if (!state->new_bs) {
1619 if (bdrv_has_blk(state->new_bs)) {
1620 error_setg(errp, "The overlay is already in use");
1624 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1629 if (state->new_bs->backing != NULL) {
1630 error_setg(errp, "The overlay already has a backing image");
1634 if (!state->new_bs->drv->supports_backing) {
1635 error_setg(errp, "The overlay does not support backing images");
1639 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
1640 old_context = bdrv_get_aio_context(state->new_bs);
1641 aio_context_release(aio_context);
1642 aio_context_acquire(old_context);
1644 ret = bdrv_try_set_aio_context(state->new_bs, aio_context, errp);
1646 aio_context_release(old_context);
1647 aio_context_acquire(aio_context);
1653 /* This removes our old bs and adds the new bs. This is an operation that
1654 * can fail, so we need to do it in .prepare; undoing it for abort is
1655 * always possible. */
1656 bdrv_ref(state->new_bs);
1657 bdrv_append(state->new_bs, state->old_bs, &local_err);
1659 error_propagate(errp, local_err);
1662 state->overlay_appended = true;
1665 aio_context_release(aio_context);
1668 static void external_snapshot_commit(BlkActionState *common)
1670 ExternalSnapshotState *state =
1671 DO_UPCAST(ExternalSnapshotState, common, common);
1672 AioContext *aio_context;
1674 aio_context = bdrv_get_aio_context(state->old_bs);
1675 aio_context_acquire(aio_context);
1677 /* We don't need (or want) to use the transactional
1678 * bdrv_reopen_multiple() across all the entries at once, because we
1679 * don't want to abort all of them if one of them fails the reopen */
1680 if (!atomic_read(&state->old_bs->copy_on_read)) {
1681 bdrv_reopen_set_read_only(state->old_bs, true, NULL);
1684 aio_context_release(aio_context);
1687 static void external_snapshot_abort(BlkActionState *common)
1689 ExternalSnapshotState *state =
1690 DO_UPCAST(ExternalSnapshotState, common, common);
1691 if (state->new_bs) {
1692 if (state->overlay_appended) {
1693 AioContext *aio_context;
1694 AioContext *tmp_context;
1697 aio_context = bdrv_get_aio_context(state->old_bs);
1698 aio_context_acquire(aio_context);
1700 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1701 close state->old_bs; we need it */
1702 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1705 * The call to bdrv_set_backing_hd() above returns state->old_bs to
1706 * the main AioContext. As we're still going to be using it, return
1707 * it to the AioContext it was before.
1709 tmp_context = bdrv_get_aio_context(state->old_bs);
1710 if (aio_context != tmp_context) {
1711 aio_context_release(aio_context);
1712 aio_context_acquire(tmp_context);
1714 ret = bdrv_try_set_aio_context(state->old_bs,
1718 aio_context_release(tmp_context);
1719 aio_context_acquire(aio_context);
1722 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1723 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1725 aio_context_release(aio_context);
1730 static void external_snapshot_clean(BlkActionState *common)
1732 ExternalSnapshotState *state =
1733 DO_UPCAST(ExternalSnapshotState, common, common);
1734 AioContext *aio_context;
1736 if (!state->old_bs) {
1740 aio_context = bdrv_get_aio_context(state->old_bs);
1741 aio_context_acquire(aio_context);
1743 bdrv_drained_end(state->old_bs);
1744 bdrv_unref(state->new_bs);
1746 aio_context_release(aio_context);
1749 typedef struct DriveBackupState {
1750 BlkActionState common;
1751 BlockDriverState *bs;
1755 static BlockJob *do_backup_common(BackupCommon *backup,
1756 BlockDriverState *bs,
1757 BlockDriverState *target_bs,
1758 AioContext *aio_context,
1759 JobTxn *txn, Error **errp);
1761 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1763 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1764 DriveBackup *backup;
1765 BlockDriverState *bs;
1766 BlockDriverState *target_bs;
1767 BlockDriverState *source = NULL;
1768 AioContext *aio_context;
1769 AioContext *old_context;
1771 Error *local_err = NULL;
1774 bool set_backing_hd = false;
1777 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1778 backup = common->action->u.drive_backup.data;
1780 if (!backup->has_mode) {
1781 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1784 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1790 error_setg(errp, "Device has no medium");
1794 aio_context = bdrv_get_aio_context(bs);
1795 aio_context_acquire(aio_context);
1797 /* Paired with .clean() */
1798 bdrv_drained_begin(bs);
1800 if (!backup->has_format) {
1801 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
1802 NULL : (char *) bs->drv->format_name;
1805 /* Early check to avoid creating target */
1806 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
1810 flags = bs->open_flags | BDRV_O_RDWR;
1813 * See if we have a backing HD we can use to create our new image
1816 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
1817 source = backing_bs(bs);
1819 backup->sync = MIRROR_SYNC_MODE_FULL;
1822 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
1824 flags |= BDRV_O_NO_BACKING;
1825 set_backing_hd = true;
1828 size = bdrv_getlength(bs);
1830 error_setg_errno(errp, -size, "bdrv_getlength failed");
1834 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
1835 assert(backup->format);
1837 bdrv_refresh_filename(source);
1838 bdrv_img_create(backup->target, backup->format, source->filename,
1839 source->drv->format_name, NULL,
1840 size, flags, false, &local_err);
1842 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
1843 size, flags, false, &local_err);
1848 error_propagate(errp, local_err);
1852 options = qdict_new();
1853 qdict_put_str(options, "discard", "unmap");
1854 qdict_put_str(options, "detect-zeroes", "unmap");
1855 if (backup->format) {
1856 qdict_put_str(options, "driver", backup->format);
1859 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
1864 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
1865 old_context = bdrv_get_aio_context(target_bs);
1866 aio_context_release(aio_context);
1867 aio_context_acquire(old_context);
1869 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
1871 bdrv_unref(target_bs);
1872 aio_context_release(old_context);
1876 aio_context_release(old_context);
1877 aio_context_acquire(aio_context);
1879 if (set_backing_hd) {
1880 bdrv_set_backing_hd(target_bs, source, &local_err);
1888 state->job = do_backup_common(qapi_DriveBackup_base(backup),
1889 bs, target_bs, aio_context,
1890 common->block_job_txn, errp);
1893 bdrv_unref(target_bs);
1895 aio_context_release(aio_context);
1898 static void drive_backup_commit(BlkActionState *common)
1900 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1901 AioContext *aio_context;
1903 aio_context = bdrv_get_aio_context(state->bs);
1904 aio_context_acquire(aio_context);
1907 job_start(&state->job->job);
1909 aio_context_release(aio_context);
1912 static void drive_backup_abort(BlkActionState *common)
1914 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1917 AioContext *aio_context;
1919 aio_context = bdrv_get_aio_context(state->bs);
1920 aio_context_acquire(aio_context);
1922 job_cancel_sync(&state->job->job);
1924 aio_context_release(aio_context);
1928 static void drive_backup_clean(BlkActionState *common)
1930 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1931 AioContext *aio_context;
1937 aio_context = bdrv_get_aio_context(state->bs);
1938 aio_context_acquire(aio_context);
1940 bdrv_drained_end(state->bs);
1942 aio_context_release(aio_context);
1945 typedef struct BlockdevBackupState {
1946 BlkActionState common;
1947 BlockDriverState *bs;
1949 } BlockdevBackupState;
1951 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1953 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1954 BlockdevBackup *backup;
1955 BlockDriverState *bs;
1956 BlockDriverState *target_bs;
1957 AioContext *aio_context;
1958 AioContext *old_context;
1961 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1962 backup = common->action->u.blockdev_backup.data;
1964 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1969 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
1974 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
1975 aio_context = bdrv_get_aio_context(bs);
1976 old_context = bdrv_get_aio_context(target_bs);
1977 aio_context_acquire(old_context);
1979 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
1981 aio_context_release(old_context);
1985 aio_context_release(old_context);
1986 aio_context_acquire(aio_context);
1989 /* Paired with .clean() */
1990 bdrv_drained_begin(state->bs);
1992 state->job = do_backup_common(qapi_BlockdevBackup_base(backup),
1993 bs, target_bs, aio_context,
1994 common->block_job_txn, errp);
1996 aio_context_release(aio_context);
1999 static void blockdev_backup_commit(BlkActionState *common)
2001 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2002 AioContext *aio_context;
2004 aio_context = bdrv_get_aio_context(state->bs);
2005 aio_context_acquire(aio_context);
2008 job_start(&state->job->job);
2010 aio_context_release(aio_context);
2013 static void blockdev_backup_abort(BlkActionState *common)
2015 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2018 AioContext *aio_context;
2020 aio_context = bdrv_get_aio_context(state->bs);
2021 aio_context_acquire(aio_context);
2023 job_cancel_sync(&state->job->job);
2025 aio_context_release(aio_context);
2029 static void blockdev_backup_clean(BlkActionState *common)
2031 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
2032 AioContext *aio_context;
2038 aio_context = bdrv_get_aio_context(state->bs);
2039 aio_context_acquire(aio_context);
2041 bdrv_drained_end(state->bs);
2043 aio_context_release(aio_context);
2046 typedef struct BlockDirtyBitmapState {
2047 BlkActionState common;
2048 BdrvDirtyBitmap *bitmap;
2049 BlockDriverState *bs;
2053 } BlockDirtyBitmapState;
2055 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
2058 Error *local_err = NULL;
2059 BlockDirtyBitmapAdd *action;
2060 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2063 if (action_check_completion_mode(common, errp) < 0) {
2067 action = common->action->u.block_dirty_bitmap_add.data;
2068 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2069 qmp_block_dirty_bitmap_add(action->node, action->name,
2070 action->has_granularity, action->granularity,
2071 action->has_persistent, action->persistent,
2072 action->has_disabled, action->disabled,
2076 state->prepared = true;
2078 error_propagate(errp, local_err);
2082 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2084 BlockDirtyBitmapAdd *action;
2085 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2088 action = common->action->u.block_dirty_bitmap_add.data;
2089 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2090 * then the node reference and bitmap name must have been valid.
2092 if (state->prepared) {
2093 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2097 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2100 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2102 BlockDirtyBitmap *action;
2104 if (action_check_completion_mode(common, errp) < 0) {
2108 action = common->action->u.block_dirty_bitmap_clear.data;
2109 state->bitmap = block_dirty_bitmap_lookup(action->node,
2113 if (!state->bitmap) {
2117 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) {
2121 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2124 static void block_dirty_bitmap_restore(BlkActionState *common)
2126 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2129 if (state->backup) {
2130 bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
2134 static void block_dirty_bitmap_free_backup(BlkActionState *common)
2136 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2139 hbitmap_free(state->backup);
2142 static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
2145 BlockDirtyBitmap *action;
2146 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2149 if (action_check_completion_mode(common, errp) < 0) {
2153 action = common->action->u.block_dirty_bitmap_enable.data;
2154 state->bitmap = block_dirty_bitmap_lookup(action->node,
2158 if (!state->bitmap) {
2162 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2166 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2167 bdrv_enable_dirty_bitmap(state->bitmap);
2170 static void block_dirty_bitmap_enable_abort(BlkActionState *common)
2172 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2175 if (!state->was_enabled) {
2176 bdrv_disable_dirty_bitmap(state->bitmap);
2180 static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
2183 BlockDirtyBitmap *action;
2184 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2187 if (action_check_completion_mode(common, errp) < 0) {
2191 action = common->action->u.block_dirty_bitmap_disable.data;
2192 state->bitmap = block_dirty_bitmap_lookup(action->node,
2196 if (!state->bitmap) {
2200 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2204 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2205 bdrv_disable_dirty_bitmap(state->bitmap);
2208 static void block_dirty_bitmap_disable_abort(BlkActionState *common)
2210 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2213 if (state->was_enabled) {
2214 bdrv_enable_dirty_bitmap(state->bitmap);
2218 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge(
2219 const char *node, const char *target,
2220 BlockDirtyBitmapMergeSourceList *bitmaps,
2221 HBitmap **backup, Error **errp);
2223 static void block_dirty_bitmap_merge_prepare(BlkActionState *common,
2226 BlockDirtyBitmapMerge *action;
2227 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2230 if (action_check_completion_mode(common, errp) < 0) {
2234 action = common->action->u.block_dirty_bitmap_merge.data;
2236 state->bitmap = do_block_dirty_bitmap_merge(action->node, action->target,
2237 action->bitmaps, &state->backup,
2241 static BdrvDirtyBitmap *do_block_dirty_bitmap_remove(
2242 const char *node, const char *name, bool release,
2243 BlockDriverState **bitmap_bs, Error **errp);
2245 static void block_dirty_bitmap_remove_prepare(BlkActionState *common,
2248 BlockDirtyBitmap *action;
2249 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2252 if (action_check_completion_mode(common, errp) < 0) {
2256 action = common->action->u.block_dirty_bitmap_remove.data;
2258 state->bitmap = do_block_dirty_bitmap_remove(action->node, action->name,
2259 false, &state->bs, errp);
2260 if (state->bitmap) {
2261 bdrv_dirty_bitmap_skip_store(state->bitmap, true);
2262 bdrv_dirty_bitmap_set_busy(state->bitmap, true);
2266 static void block_dirty_bitmap_remove_abort(BlkActionState *common)
2268 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2271 if (state->bitmap) {
2272 bdrv_dirty_bitmap_skip_store(state->bitmap, false);
2273 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2277 static void block_dirty_bitmap_remove_commit(BlkActionState *common)
2279 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2282 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2283 bdrv_release_dirty_bitmap(state->bitmap);
2286 static void abort_prepare(BlkActionState *common, Error **errp)
2288 error_setg(errp, "Transaction aborted using Abort action");
2291 static void abort_commit(BlkActionState *common)
2293 g_assert_not_reached(); /* this action never succeeds */
2296 static const BlkActionOps actions[] = {
2297 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2298 .instance_size = sizeof(ExternalSnapshotState),
2299 .prepare = external_snapshot_prepare,
2300 .commit = external_snapshot_commit,
2301 .abort = external_snapshot_abort,
2302 .clean = external_snapshot_clean,
2304 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2305 .instance_size = sizeof(ExternalSnapshotState),
2306 .prepare = external_snapshot_prepare,
2307 .commit = external_snapshot_commit,
2308 .abort = external_snapshot_abort,
2309 .clean = external_snapshot_clean,
2311 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2312 .instance_size = sizeof(DriveBackupState),
2313 .prepare = drive_backup_prepare,
2314 .commit = drive_backup_commit,
2315 .abort = drive_backup_abort,
2316 .clean = drive_backup_clean,
2318 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2319 .instance_size = sizeof(BlockdevBackupState),
2320 .prepare = blockdev_backup_prepare,
2321 .commit = blockdev_backup_commit,
2322 .abort = blockdev_backup_abort,
2323 .clean = blockdev_backup_clean,
2325 [TRANSACTION_ACTION_KIND_ABORT] = {
2326 .instance_size = sizeof(BlkActionState),
2327 .prepare = abort_prepare,
2328 .commit = abort_commit,
2330 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2331 .instance_size = sizeof(InternalSnapshotState),
2332 .prepare = internal_snapshot_prepare,
2333 .abort = internal_snapshot_abort,
2334 .clean = internal_snapshot_clean,
2336 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2337 .instance_size = sizeof(BlockDirtyBitmapState),
2338 .prepare = block_dirty_bitmap_add_prepare,
2339 .abort = block_dirty_bitmap_add_abort,
2341 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2342 .instance_size = sizeof(BlockDirtyBitmapState),
2343 .prepare = block_dirty_bitmap_clear_prepare,
2344 .commit = block_dirty_bitmap_free_backup,
2345 .abort = block_dirty_bitmap_restore,
2347 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = {
2348 .instance_size = sizeof(BlockDirtyBitmapState),
2349 .prepare = block_dirty_bitmap_enable_prepare,
2350 .abort = block_dirty_bitmap_enable_abort,
2352 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = {
2353 .instance_size = sizeof(BlockDirtyBitmapState),
2354 .prepare = block_dirty_bitmap_disable_prepare,
2355 .abort = block_dirty_bitmap_disable_abort,
2357 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = {
2358 .instance_size = sizeof(BlockDirtyBitmapState),
2359 .prepare = block_dirty_bitmap_merge_prepare,
2360 .commit = block_dirty_bitmap_free_backup,
2361 .abort = block_dirty_bitmap_restore,
2363 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE] = {
2364 .instance_size = sizeof(BlockDirtyBitmapState),
2365 .prepare = block_dirty_bitmap_remove_prepare,
2366 .commit = block_dirty_bitmap_remove_commit,
2367 .abort = block_dirty_bitmap_remove_abort,
2369 /* Where are transactions for MIRROR, COMMIT and STREAM?
2370 * Although these blockjobs use transaction callbacks like the backup job,
2371 * these jobs do not necessarily adhere to transaction semantics.
2372 * These jobs may not fully undo all of their actions on abort, nor do they
2373 * necessarily work in transactions with more than one job in them.
2378 * Allocate a TransactionProperties structure if necessary, and fill
2379 * that structure with desired defaults if they are unset.
2381 static TransactionProperties *get_transaction_properties(
2382 TransactionProperties *props)
2385 props = g_new0(TransactionProperties, 1);
2388 if (!props->has_completion_mode) {
2389 props->has_completion_mode = true;
2390 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2397 * 'Atomic' group operations. The operations are performed as a set, and if
2398 * any fail then we roll back all operations in the group.
2400 void qmp_transaction(TransactionActionList *dev_list,
2402 struct TransactionProperties *props,
2405 TransactionActionList *dev_entry = dev_list;
2406 JobTxn *block_job_txn = NULL;
2407 BlkActionState *state, *next;
2408 Error *local_err = NULL;
2410 QTAILQ_HEAD(, BlkActionState) snap_bdrv_states;
2411 QTAILQ_INIT(&snap_bdrv_states);
2413 /* Does this transaction get canceled as a group on failure?
2414 * If not, we don't really need to make a JobTxn.
2416 props = get_transaction_properties(props);
2417 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2418 block_job_txn = job_txn_new();
2421 /* drain all i/o before any operations */
2424 /* We don't do anything in this loop that commits us to the operations */
2425 while (NULL != dev_entry) {
2426 TransactionAction *dev_info = NULL;
2427 const BlkActionOps *ops;
2429 dev_info = dev_entry->value;
2430 dev_entry = dev_entry->next;
2432 assert(dev_info->type < ARRAY_SIZE(actions));
2434 ops = &actions[dev_info->type];
2435 assert(ops->instance_size > 0);
2437 state = g_malloc0(ops->instance_size);
2439 state->action = dev_info;
2440 state->block_job_txn = block_job_txn;
2441 state->txn_props = props;
2442 QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2444 state->ops->prepare(state, &local_err);
2446 error_propagate(errp, local_err);
2447 goto delete_and_fail;
2451 QTAILQ_FOREACH(state, &snap_bdrv_states, entry) {
2452 if (state->ops->commit) {
2453 state->ops->commit(state);
2461 /* failure, and it is all-or-none; roll back all operations */
2462 QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) {
2463 if (state->ops->abort) {
2464 state->ops->abort(state);
2468 QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2469 if (state->ops->clean) {
2470 state->ops->clean(state);
2475 qapi_free_TransactionProperties(props);
2477 job_txn_unref(block_job_txn);
2480 void qmp_block_passwd(bool has_device, const char *device,
2481 bool has_node_name, const char *node_name,
2482 const char *password, Error **errp)
2485 "Setting block passwords directly is no longer supported");
2488 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2489 bool has_granularity, uint32_t granularity,
2490 bool has_persistent, bool persistent,
2491 bool has_disabled, bool disabled,
2494 BlockDriverState *bs;
2495 BdrvDirtyBitmap *bitmap;
2496 AioContext *aio_context;
2498 if (!name || name[0] == '\0') {
2499 error_setg(errp, "Bitmap name cannot be empty");
2503 bs = bdrv_lookup_bs(node, node, errp);
2508 aio_context = bdrv_get_aio_context(bs);
2509 aio_context_acquire(aio_context);
2511 if (has_granularity) {
2512 if (granularity < 512 || !is_power_of_2(granularity)) {
2513 error_setg(errp, "Granularity must be power of 2 "
2514 "and at least 512");
2518 /* Default to cluster size, if available: */
2519 granularity = bdrv_get_default_bitmap_granularity(bs);
2522 if (!has_persistent) {
2526 if (!has_disabled) {
2531 !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
2536 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2537 if (bitmap == NULL) {
2542 bdrv_disable_dirty_bitmap(bitmap);
2545 bdrv_dirty_bitmap_set_persistence(bitmap, persistent);
2548 aio_context_release(aio_context);
2551 static BdrvDirtyBitmap *do_block_dirty_bitmap_remove(
2552 const char *node, const char *name, bool release,
2553 BlockDriverState **bitmap_bs, Error **errp)
2555 BlockDriverState *bs;
2556 BdrvDirtyBitmap *bitmap;
2557 AioContext *aio_context;
2559 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2560 if (!bitmap || !bs) {
2564 aio_context = bdrv_get_aio_context(bs);
2565 aio_context_acquire(aio_context);
2567 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_BUSY | BDRV_BITMAP_RO,
2569 aio_context_release(aio_context);
2573 if (bdrv_dirty_bitmap_get_persistence(bitmap) &&
2574 bdrv_remove_persistent_dirty_bitmap(bs, name, errp) < 0)
2576 aio_context_release(aio_context);
2581 bdrv_release_dirty_bitmap(bitmap);
2588 aio_context_release(aio_context);
2589 return release ? NULL : bitmap;
2592 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2595 do_block_dirty_bitmap_remove(node, name, true, NULL, errp);
2599 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2600 * immediately after a full backup operation.
2602 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2605 BdrvDirtyBitmap *bitmap;
2606 BlockDriverState *bs;
2608 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2609 if (!bitmap || !bs) {
2613 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, errp)) {
2617 bdrv_clear_dirty_bitmap(bitmap, NULL);
2620 void qmp_block_dirty_bitmap_enable(const char *node, const char *name,
2623 BlockDriverState *bs;
2624 BdrvDirtyBitmap *bitmap;
2626 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2631 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2635 bdrv_enable_dirty_bitmap(bitmap);
2638 void qmp_block_dirty_bitmap_disable(const char *node, const char *name,
2641 BlockDriverState *bs;
2642 BdrvDirtyBitmap *bitmap;
2644 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2649 if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2653 bdrv_disable_dirty_bitmap(bitmap);
2656 static BdrvDirtyBitmap *do_block_dirty_bitmap_merge(
2657 const char *node, const char *target,
2658 BlockDirtyBitmapMergeSourceList *bitmaps,
2659 HBitmap **backup, Error **errp)
2661 BlockDriverState *bs;
2662 BdrvDirtyBitmap *dst, *src, *anon;
2663 BlockDirtyBitmapMergeSourceList *lst;
2664 Error *local_err = NULL;
2666 dst = block_dirty_bitmap_lookup(node, target, &bs, errp);
2671 anon = bdrv_create_dirty_bitmap(bs, bdrv_dirty_bitmap_granularity(dst),
2677 for (lst = bitmaps; lst; lst = lst->next) {
2678 switch (lst->value->type) {
2679 const char *name, *node;
2681 name = lst->value->u.local;
2682 src = bdrv_find_dirty_bitmap(bs, name);
2684 error_setg(errp, "Dirty bitmap '%s' not found", name);
2690 node = lst->value->u.external.node;
2691 name = lst->value->u.external.name;
2692 src = block_dirty_bitmap_lookup(node, name, NULL, errp);
2702 bdrv_merge_dirty_bitmap(anon, src, NULL, &local_err);
2704 error_propagate(errp, local_err);
2710 /* Merge into dst; dst is unchanged on failure. */
2711 bdrv_merge_dirty_bitmap(dst, anon, backup, errp);
2714 bdrv_release_dirty_bitmap(anon);
2718 void qmp_block_dirty_bitmap_merge(const char *node, const char *target,
2719 BlockDirtyBitmapMergeSourceList *bitmaps,
2722 do_block_dirty_bitmap_merge(node, target, bitmaps, NULL, errp);
2725 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2729 BdrvDirtyBitmap *bitmap;
2730 BlockDriverState *bs;
2731 BlockDirtyBitmapSha256 *ret = NULL;
2734 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2735 if (!bitmap || !bs) {
2739 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2740 if (sha256 == NULL) {
2744 ret = g_new(BlockDirtyBitmapSha256, 1);
2745 ret->sha256 = sha256;
2750 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2752 const char *id = qdict_get_str(qdict, "id");
2754 BlockDriverState *bs;
2755 AioContext *aio_context;
2756 Error *local_err = NULL;
2758 bs = bdrv_find_node(id);
2760 qmp_blockdev_del(id, &local_err);
2762 error_report_err(local_err);
2767 blk = blk_by_name(id);
2769 error_report("Device '%s' not found", id);
2773 if (!blk_legacy_dinfo(blk)) {
2774 error_report("Deleting device added with blockdev-add"
2775 " is not supported");
2779 aio_context = blk_get_aio_context(blk);
2780 aio_context_acquire(aio_context);
2784 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2785 error_report_err(local_err);
2786 aio_context_release(aio_context);
2793 /* Make the BlockBackend and the attached BlockDriverState anonymous */
2794 monitor_remove_blk(blk);
2796 /* If this BlockBackend has a device attached to it, its refcount will be
2797 * decremented when the device is removed; otherwise we have to do so here.
2799 if (blk_get_attached_dev(blk)) {
2800 /* Further I/O must not pause the guest */
2801 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2802 BLOCKDEV_ON_ERROR_REPORT);
2807 aio_context_release(aio_context);
2810 void qmp_block_resize(bool has_device, const char *device,
2811 bool has_node_name, const char *node_name,
2812 int64_t size, Error **errp)
2814 Error *local_err = NULL;
2815 BlockBackend *blk = NULL;
2816 BlockDriverState *bs;
2817 AioContext *aio_context;
2820 bs = bdrv_lookup_bs(has_device ? device : NULL,
2821 has_node_name ? node_name : NULL,
2824 error_propagate(errp, local_err);
2828 aio_context = bdrv_get_aio_context(bs);
2829 aio_context_acquire(aio_context);
2832 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2836 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2837 error_setg(errp, QERR_DEVICE_IN_USE, device);
2841 blk = blk_new(bdrv_get_aio_context(bs), BLK_PERM_RESIZE, BLK_PERM_ALL);
2842 ret = blk_insert_bs(blk, bs, errp);
2847 bdrv_drained_begin(bs);
2848 ret = blk_truncate(blk, size, false, PREALLOC_MODE_OFF, errp);
2849 bdrv_drained_end(bs);
2853 aio_context_release(aio_context);
2856 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
2857 bool has_base, const char *base,
2858 bool has_base_node, const char *base_node,
2859 bool has_backing_file, const char *backing_file,
2860 bool has_speed, int64_t speed,
2861 bool has_on_error, BlockdevOnError on_error,
2862 bool has_auto_finalize, bool auto_finalize,
2863 bool has_auto_dismiss, bool auto_dismiss,
2866 BlockDriverState *bs, *iter;
2867 BlockDriverState *base_bs = NULL;
2868 AioContext *aio_context;
2869 Error *local_err = NULL;
2870 const char *base_name = NULL;
2871 int job_flags = JOB_DEFAULT;
2873 if (!has_on_error) {
2874 on_error = BLOCKDEV_ON_ERROR_REPORT;
2877 bs = bdrv_lookup_bs(device, device, errp);
2882 aio_context = bdrv_get_aio_context(bs);
2883 aio_context_acquire(aio_context);
2885 if (has_base && has_base_node) {
2886 error_setg(errp, "'base' and 'base-node' cannot be specified "
2887 "at the same time");
2892 base_bs = bdrv_find_backing_image(bs, base);
2893 if (base_bs == NULL) {
2894 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2897 assert(bdrv_get_aio_context(base_bs) == aio_context);
2901 if (has_base_node) {
2902 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2906 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
2907 error_setg(errp, "Node '%s' is not a backing image of '%s'",
2911 assert(bdrv_get_aio_context(base_bs) == aio_context);
2912 bdrv_refresh_filename(base_bs);
2913 base_name = base_bs->filename;
2916 /* Check for op blockers in the whole chain between bs and base */
2917 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
2918 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
2923 /* if we are streaming the entire chain, the result will have no backing
2924 * file, and specifying one is therefore an error */
2925 if (base_bs == NULL && has_backing_file) {
2926 error_setg(errp, "backing file specified, but streaming the "
2931 /* backing_file string overrides base bs filename */
2932 base_name = has_backing_file ? backing_file : base_name;
2934 if (has_auto_finalize && !auto_finalize) {
2935 job_flags |= JOB_MANUAL_FINALIZE;
2937 if (has_auto_dismiss && !auto_dismiss) {
2938 job_flags |= JOB_MANUAL_DISMISS;
2941 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
2942 job_flags, has_speed ? speed : 0, on_error, &local_err);
2944 error_propagate(errp, local_err);
2948 trace_qmp_block_stream(bs);
2951 aio_context_release(aio_context);
2954 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
2955 bool has_base_node, const char *base_node,
2956 bool has_base, const char *base,
2957 bool has_top_node, const char *top_node,
2958 bool has_top, const char *top,
2959 bool has_backing_file, const char *backing_file,
2960 bool has_speed, int64_t speed,
2961 bool has_on_error, BlockdevOnError on_error,
2962 bool has_filter_node_name, const char *filter_node_name,
2963 bool has_auto_finalize, bool auto_finalize,
2964 bool has_auto_dismiss, bool auto_dismiss,
2967 BlockDriverState *bs;
2968 BlockDriverState *iter;
2969 BlockDriverState *base_bs, *top_bs;
2970 AioContext *aio_context;
2971 Error *local_err = NULL;
2972 int job_flags = JOB_DEFAULT;
2977 if (!has_on_error) {
2978 on_error = BLOCKDEV_ON_ERROR_REPORT;
2980 if (!has_filter_node_name) {
2981 filter_node_name = NULL;
2983 if (has_auto_finalize && !auto_finalize) {
2984 job_flags |= JOB_MANUAL_FINALIZE;
2986 if (has_auto_dismiss && !auto_dismiss) {
2987 job_flags |= JOB_MANUAL_DISMISS;
2991 * libvirt relies on the DeviceNotFound error class in order to probe for
2992 * live commit feature versions; for this to work, we must make sure to
2993 * perform the device lookup before any generic errors that may occur in a
2994 * scenario in which all optional arguments are omitted. */
2995 bs = qmp_get_root_bs(device, &local_err);
2997 bs = bdrv_lookup_bs(device, device, NULL);
2999 error_free(local_err);
3000 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3001 "Device '%s' not found", device);
3003 error_propagate(errp, local_err);
3008 aio_context = bdrv_get_aio_context(bs);
3009 aio_context_acquire(aio_context);
3011 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3015 /* default top_bs is the active layer */
3018 if (has_top_node && has_top) {
3019 error_setg(errp, "'top-node' and 'top' are mutually exclusive");
3021 } else if (has_top_node) {
3022 top_bs = bdrv_lookup_bs(NULL, top_node, errp);
3023 if (top_bs == NULL) {
3026 if (!bdrv_chain_contains(bs, top_bs)) {
3027 error_setg(errp, "'%s' is not in this backing file chain",
3031 } else if (has_top && top) {
3032 /* This strcmp() is just a shortcut, there is no need to
3033 * refresh @bs's filename. If it mismatches,
3034 * bdrv_find_backing_image() will do the refresh and may still
3036 if (strcmp(bs->filename, top) != 0) {
3037 top_bs = bdrv_find_backing_image(bs, top);
3041 if (top_bs == NULL) {
3042 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3046 assert(bdrv_get_aio_context(top_bs) == aio_context);
3048 if (has_base_node && has_base) {
3049 error_setg(errp, "'base-node' and 'base' are mutually exclusive");
3051 } else if (has_base_node) {
3052 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
3053 if (base_bs == NULL) {
3056 if (!bdrv_chain_contains(top_bs, base_bs)) {
3057 error_setg(errp, "'%s' is not in this backing file chain",
3061 } else if (has_base && base) {
3062 base_bs = bdrv_find_backing_image(top_bs, base);
3064 base_bs = bdrv_find_base(top_bs);
3067 if (base_bs == NULL) {
3068 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3072 assert(bdrv_get_aio_context(base_bs) == aio_context);
3074 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) {
3075 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3080 /* Do not allow attempts to commit an image into itself */
3081 if (top_bs == base_bs) {
3082 error_setg(errp, "cannot commit an image into itself");
3087 if (has_backing_file) {
3088 error_setg(errp, "'backing-file' specified,"
3089 " but 'top' is the active layer");
3092 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
3093 job_flags, speed, on_error,
3094 filter_node_name, NULL, NULL, false, &local_err);
3096 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
3097 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3100 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags,
3101 speed, on_error, has_backing_file ? backing_file : NULL,
3102 filter_node_name, &local_err);
3104 if (local_err != NULL) {
3105 error_propagate(errp, local_err);
3110 aio_context_release(aio_context);
3113 /* Common QMP interface for drive-backup and blockdev-backup */
3114 static BlockJob *do_backup_common(BackupCommon *backup,
3115 BlockDriverState *bs,
3116 BlockDriverState *target_bs,
3117 AioContext *aio_context,
3118 JobTxn *txn, Error **errp)
3120 BlockJob *job = NULL;
3121 BdrvDirtyBitmap *bmap = NULL;
3122 int job_flags = JOB_DEFAULT;
3124 if (!backup->has_speed) {
3127 if (!backup->has_on_source_error) {
3128 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3130 if (!backup->has_on_target_error) {
3131 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3133 if (!backup->has_job_id) {
3134 backup->job_id = NULL;
3136 if (!backup->has_auto_finalize) {
3137 backup->auto_finalize = true;
3139 if (!backup->has_auto_dismiss) {
3140 backup->auto_dismiss = true;
3142 if (!backup->has_compress) {
3143 backup->compress = false;
3146 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) ||
3147 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) {
3148 /* done before desugaring 'incremental' to print the right message */
3149 if (!backup->has_bitmap) {
3150 error_setg(errp, "must provide a valid bitmap name for "
3151 "'%s' sync mode", MirrorSyncMode_str(backup->sync));
3156 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) {
3157 if (backup->has_bitmap_mode &&
3158 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) {
3159 error_setg(errp, "Bitmap sync mode must be '%s' "
3160 "when using sync mode '%s'",
3161 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS),
3162 MirrorSyncMode_str(backup->sync));
3165 backup->has_bitmap_mode = true;
3166 backup->sync = MIRROR_SYNC_MODE_BITMAP;
3167 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS;
3170 if (backup->has_bitmap) {
3171 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
3173 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
3176 if (!backup->has_bitmap_mode) {
3177 error_setg(errp, "Bitmap sync mode must be given "
3178 "when providing a bitmap");
3181 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) {
3185 /* This does not produce a useful bitmap artifact: */
3186 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
3187 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap"
3188 " outputs", MirrorSyncMode_str(backup->sync));
3192 /* If the bitmap isn't used for input or output, this is useless: */
3193 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER &&
3194 backup->sync != MIRROR_SYNC_MODE_BITMAP) {
3195 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect"
3196 " when combined with sync mode '%s'",
3197 BitmapSyncMode_str(backup->bitmap_mode),
3198 MirrorSyncMode_str(backup->sync));
3203 if (!backup->has_bitmap && backup->has_bitmap_mode) {
3204 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap");
3208 if (!backup->auto_finalize) {
3209 job_flags |= JOB_MANUAL_FINALIZE;
3211 if (!backup->auto_dismiss) {
3212 job_flags |= JOB_MANUAL_DISMISS;
3215 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3216 backup->sync, bmap, backup->bitmap_mode,
3218 backup->filter_node_name,
3219 backup->on_source_error,
3220 backup->on_target_error,
3221 job_flags, NULL, NULL, txn, errp);
3225 void qmp_drive_backup(DriveBackup *backup, Error **errp)
3227 TransactionAction action = {
3228 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP,
3229 .u.drive_backup.data = backup,
3231 blockdev_do_action(&action, errp);
3234 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat,
3238 bool return_flat = has_flat && flat;
3240 return bdrv_named_nodes_list(return_flat, errp);
3243 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
3245 return bdrv_get_xdbg_block_graph(errp);
3248 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp)
3250 TransactionAction action = {
3251 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP,
3252 .u.blockdev_backup.data = backup,
3254 blockdev_do_action(&action, errp);
3257 /* Parameter check and block job starting for drive mirroring.
3258 * Caller should hold @device and @target's aio context (must be the same).
3260 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
3261 BlockDriverState *target,
3262 bool has_replaces, const char *replaces,
3263 enum MirrorSyncMode sync,
3264 BlockMirrorBackingMode backing_mode,
3266 bool has_speed, int64_t speed,
3267 bool has_granularity, uint32_t granularity,
3268 bool has_buf_size, int64_t buf_size,
3269 bool has_on_source_error,
3270 BlockdevOnError on_source_error,
3271 bool has_on_target_error,
3272 BlockdevOnError on_target_error,
3273 bool has_unmap, bool unmap,
3274 bool has_filter_node_name,
3275 const char *filter_node_name,
3276 bool has_copy_mode, MirrorCopyMode copy_mode,
3277 bool has_auto_finalize, bool auto_finalize,
3278 bool has_auto_dismiss, bool auto_dismiss,
3281 int job_flags = JOB_DEFAULT;
3286 if (!has_on_source_error) {
3287 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3289 if (!has_on_target_error) {
3290 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3292 if (!has_granularity) {
3295 if (!has_buf_size) {
3301 if (!has_filter_node_name) {
3302 filter_node_name = NULL;
3304 if (!has_copy_mode) {
3305 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
3307 if (has_auto_finalize && !auto_finalize) {
3308 job_flags |= JOB_MANUAL_FINALIZE;
3310 if (has_auto_dismiss && !auto_dismiss) {
3311 job_flags |= JOB_MANUAL_DISMISS;
3314 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3315 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3316 "a value in range [512B, 64MB]");
3319 if (granularity & (granularity - 1)) {
3320 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3325 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3328 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3332 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3333 sync = MIRROR_SYNC_MODE_FULL;
3337 BlockDriverState *to_replace_bs;
3338 AioContext *replace_aio_context;
3339 int64_t bs_size, replace_size;
3341 bs_size = bdrv_getlength(bs);
3343 error_setg_errno(errp, -bs_size, "Failed to query device's size");
3347 to_replace_bs = check_to_replace_node(bs, replaces, errp);
3348 if (!to_replace_bs) {
3352 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3353 aio_context_acquire(replace_aio_context);
3354 replace_size = bdrv_getlength(to_replace_bs);
3355 aio_context_release(replace_aio_context);
3357 if (replace_size < 0) {
3358 error_setg_errno(errp, -replace_size,
3359 "Failed to query the replacement node's size");
3362 if (bs_size != replace_size) {
3363 error_setg(errp, "cannot replace image with a mirror image of "
3369 /* pass the node name to replace to mirror start since it's loose coupling
3370 * and will allow to check whether the node still exist at mirror completion
3372 mirror_start(job_id, bs, target,
3373 has_replaces ? replaces : NULL, job_flags,
3374 speed, granularity, buf_size, sync, backing_mode, zero_target,
3375 on_source_error, on_target_error, unmap, filter_node_name,
3379 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3381 BlockDriverState *bs;
3382 BlockDriverState *source, *target_bs;
3383 AioContext *aio_context;
3384 AioContext *old_context;
3385 BlockMirrorBackingMode backing_mode;
3386 Error *local_err = NULL;
3387 QDict *options = NULL;
3390 const char *format = arg->format;
3394 bs = qmp_get_root_bs(arg->device, errp);
3399 /* Early check to avoid creating target */
3400 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3404 aio_context = bdrv_get_aio_context(bs);
3405 aio_context_acquire(aio_context);
3407 if (!arg->has_mode) {
3408 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3411 if (!arg->has_format) {
3412 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3413 ? NULL : bs->drv->format_name);
3416 flags = bs->open_flags | BDRV_O_RDWR;
3417 source = backing_bs(bs);
3418 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) {
3419 arg->sync = MIRROR_SYNC_MODE_FULL;
3421 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3425 size = bdrv_getlength(bs);
3427 error_setg_errno(errp, -size, "bdrv_getlength failed");
3431 if (arg->has_replaces) {
3432 if (!arg->has_node_name) {
3433 error_setg(errp, "a node-name must be provided when replacing a"
3434 " named node of the graph");
3439 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3440 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3442 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3445 /* Don't open backing image in create() */
3446 flags |= BDRV_O_NO_BACKING;
3448 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source)
3449 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3451 /* create new image w/o backing file */
3453 bdrv_img_create(arg->target, format,
3454 NULL, NULL, NULL, size, flags, false, &local_err);
3456 switch (arg->mode) {
3457 case NEW_IMAGE_MODE_EXISTING:
3459 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3460 /* create new image with backing file */
3461 bdrv_refresh_filename(source);
3462 bdrv_img_create(arg->target, format,
3464 source->drv->format_name,
3465 NULL, size, flags, false, &local_err);
3473 error_propagate(errp, local_err);
3477 options = qdict_new();
3478 if (arg->has_node_name) {
3479 qdict_put_str(options, "node-name", arg->node_name);
3482 qdict_put_str(options, "driver", format);
3485 /* Mirroring takes care of copy-on-write using the source's backing
3488 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3493 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL &&
3494 (arg->mode == NEW_IMAGE_MODE_EXISTING ||
3495 !bdrv_has_zero_init(target_bs)));
3498 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
3499 old_context = bdrv_get_aio_context(target_bs);
3500 aio_context_release(aio_context);
3501 aio_context_acquire(old_context);
3503 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
3505 bdrv_unref(target_bs);
3506 aio_context_release(old_context);
3510 aio_context_release(old_context);
3511 aio_context_acquire(aio_context);
3513 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
3514 arg->has_replaces, arg->replaces, arg->sync,
3515 backing_mode, zero_target,
3516 arg->has_speed, arg->speed,
3517 arg->has_granularity, arg->granularity,
3518 arg->has_buf_size, arg->buf_size,
3519 arg->has_on_source_error, arg->on_source_error,
3520 arg->has_on_target_error, arg->on_target_error,
3521 arg->has_unmap, arg->unmap,
3523 arg->has_copy_mode, arg->copy_mode,
3524 arg->has_auto_finalize, arg->auto_finalize,
3525 arg->has_auto_dismiss, arg->auto_dismiss,
3527 bdrv_unref(target_bs);
3528 error_propagate(errp, local_err);
3530 aio_context_release(aio_context);
3533 void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
3534 const char *device, const char *target,
3535 bool has_replaces, const char *replaces,
3536 MirrorSyncMode sync,
3537 bool has_speed, int64_t speed,
3538 bool has_granularity, uint32_t granularity,
3539 bool has_buf_size, int64_t buf_size,
3540 bool has_on_source_error,
3541 BlockdevOnError on_source_error,
3542 bool has_on_target_error,
3543 BlockdevOnError on_target_error,
3544 bool has_filter_node_name,
3545 const char *filter_node_name,
3546 bool has_copy_mode, MirrorCopyMode copy_mode,
3547 bool has_auto_finalize, bool auto_finalize,
3548 bool has_auto_dismiss, bool auto_dismiss,
3551 BlockDriverState *bs;
3552 BlockDriverState *target_bs;
3553 AioContext *aio_context;
3554 AioContext *old_context;
3555 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3556 Error *local_err = NULL;
3560 bs = qmp_get_root_bs(device, errp);
3565 target_bs = bdrv_lookup_bs(target, target, errp);
3570 zero_target = (sync == MIRROR_SYNC_MODE_FULL);
3572 /* Honor bdrv_try_set_aio_context() context acquisition requirements. */
3573 old_context = bdrv_get_aio_context(target_bs);
3574 aio_context = bdrv_get_aio_context(bs);
3575 aio_context_acquire(old_context);
3577 ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
3579 aio_context_release(old_context);
3580 aio_context_acquire(aio_context);
3586 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3587 has_replaces, replaces, sync, backing_mode,
3588 zero_target, has_speed, speed,
3589 has_granularity, granularity,
3590 has_buf_size, buf_size,
3591 has_on_source_error, on_source_error,
3592 has_on_target_error, on_target_error,
3594 has_filter_node_name, filter_node_name,
3595 has_copy_mode, copy_mode,
3596 has_auto_finalize, auto_finalize,
3597 has_auto_dismiss, auto_dismiss,
3599 error_propagate(errp, local_err);
3601 aio_context_release(aio_context);
3604 /* Get a block job using its ID and acquire its AioContext */
3605 static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3612 *aio_context = NULL;
3614 job = block_job_get(id);
3617 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3618 "Block job '%s' not found", id);
3622 *aio_context = blk_get_aio_context(job->blk);
3623 aio_context_acquire(*aio_context);
3628 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3630 AioContext *aio_context;
3631 BlockJob *job = find_block_job(device, &aio_context, errp);
3637 block_job_set_speed(job, speed, errp);
3638 aio_context_release(aio_context);
3641 void qmp_block_job_cancel(const char *device,
3642 bool has_force, bool force, Error **errp)
3644 AioContext *aio_context;
3645 BlockJob *job = find_block_job(device, &aio_context, errp);
3655 if (job_user_paused(&job->job) && !force) {
3656 error_setg(errp, "The block job for device '%s' is currently paused",
3661 trace_qmp_block_job_cancel(job);
3662 job_user_cancel(&job->job, force, errp);
3664 aio_context_release(aio_context);
3667 void qmp_block_job_pause(const char *device, Error **errp)
3669 AioContext *aio_context;
3670 BlockJob *job = find_block_job(device, &aio_context, errp);
3676 trace_qmp_block_job_pause(job);
3677 job_user_pause(&job->job, errp);
3678 aio_context_release(aio_context);
3681 void qmp_block_job_resume(const char *device, Error **errp)
3683 AioContext *aio_context;
3684 BlockJob *job = find_block_job(device, &aio_context, errp);
3690 trace_qmp_block_job_resume(job);
3691 job_user_resume(&job->job, errp);
3692 aio_context_release(aio_context);
3695 void qmp_block_job_complete(const char *device, Error **errp)
3697 AioContext *aio_context;
3698 BlockJob *job = find_block_job(device, &aio_context, errp);
3704 trace_qmp_block_job_complete(job);
3705 job_complete(&job->job, errp);
3706 aio_context_release(aio_context);
3709 void qmp_block_job_finalize(const char *id, Error **errp)
3711 AioContext *aio_context;
3712 BlockJob *job = find_block_job(id, &aio_context, errp);
3718 trace_qmp_block_job_finalize(job);
3719 job_finalize(&job->job, errp);
3720 aio_context_release(aio_context);
3723 void qmp_block_job_dismiss(const char *id, Error **errp)
3725 AioContext *aio_context;
3726 BlockJob *bjob = find_block_job(id, &aio_context, errp);
3733 trace_qmp_block_job_dismiss(bjob);
3735 job_dismiss(&job, errp);
3736 aio_context_release(aio_context);
3739 void qmp_change_backing_file(const char *device,
3740 const char *image_node_name,
3741 const char *backing_file,
3744 BlockDriverState *bs = NULL;
3745 AioContext *aio_context;
3746 BlockDriverState *image_bs = NULL;
3747 Error *local_err = NULL;
3751 bs = qmp_get_root_bs(device, errp);
3756 aio_context = bdrv_get_aio_context(bs);
3757 aio_context_acquire(aio_context);
3759 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3761 error_propagate(errp, local_err);
3766 error_setg(errp, "image file not found");
3770 if (bdrv_find_base(image_bs) == image_bs) {
3771 error_setg(errp, "not allowing backing file change on an image "
3772 "without a backing file");
3776 /* even though we are not necessarily operating on bs, we need it to
3777 * determine if block ops are currently prohibited on the chain */
3778 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3782 /* final sanity check */
3783 if (!bdrv_chain_contains(bs, image_bs)) {
3784 error_setg(errp, "'%s' and image file are not in the same chain",
3789 /* if not r/w, reopen to make r/w */
3790 ro = bdrv_is_read_only(image_bs);
3793 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) {
3798 ret = bdrv_change_backing_file(image_bs, backing_file,
3799 image_bs->drv ? image_bs->drv->format_name : "");
3802 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3804 /* don't exit here, so we can try to restore open flags if
3809 bdrv_reopen_set_read_only(image_bs, true, &local_err);
3810 error_propagate(errp, local_err);
3814 aio_context_release(aio_context);
3817 void hmp_drive_add_node(Monitor *mon, const char *optstr)
3821 Error *local_err = NULL;
3823 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
3828 qdict = qemu_opts_to_qdict(opts, NULL);
3830 if (!qdict_get_try_str(qdict, "node-name")) {
3831 qobject_unref(qdict);
3832 error_report("'node-name' needs to be specified");
3836 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
3838 error_report_err(local_err);
3842 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3845 qemu_opts_del(opts);
3848 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3850 BlockDriverState *bs;
3852 Visitor *v = qobject_output_visitor_new(&obj);
3854 Error *local_err = NULL;
3856 visit_type_BlockdevOptions(v, NULL, &options, &local_err);
3858 error_propagate(errp, local_err);
3862 visit_complete(v, &obj);
3863 qdict = qobject_to(QDict, obj);
3865 qdict_flatten(qdict);
3867 if (!qdict_get_try_str(qdict, "node-name")) {
3868 error_setg(errp, "'node-name' must be specified for the root node");
3872 bs = bds_tree_init(qdict, errp);
3877 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3883 void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp)
3885 BlockDriverState *bs;
3888 Visitor *v = qobject_output_visitor_new(&obj);
3889 Error *local_err = NULL;
3890 BlockReopenQueue *queue;
3893 /* Check for the selected node name */
3894 if (!options->has_node_name) {
3895 error_setg(errp, "Node name not specified");
3899 bs = bdrv_find_node(options->node_name);
3901 error_setg(errp, "Cannot find node named '%s'", options->node_name);
3905 /* Put all options in a QDict and flatten it */
3906 visit_type_BlockdevOptions(v, NULL, &options, &local_err);
3908 error_propagate(errp, local_err);
3912 visit_complete(v, &obj);
3913 qdict = qobject_to(QDict, obj);
3915 qdict_flatten(qdict);
3917 /* Perform the reopen operation */
3918 ctx = bdrv_get_aio_context(bs);
3919 aio_context_acquire(ctx);
3920 bdrv_subtree_drained_begin(bs);
3921 queue = bdrv_reopen_queue(NULL, bs, qdict, false);
3922 bdrv_reopen_multiple(queue, errp);
3923 bdrv_subtree_drained_end(bs);
3924 aio_context_release(ctx);
3930 void qmp_blockdev_del(const char *node_name, Error **errp)
3932 AioContext *aio_context;
3933 BlockDriverState *bs;
3935 bs = bdrv_find_node(node_name);
3937 error_setg(errp, "Cannot find node %s", node_name);
3940 if (bdrv_has_blk(bs)) {
3941 error_setg(errp, "Node %s is in use", node_name);
3944 aio_context = bdrv_get_aio_context(bs);
3945 aio_context_acquire(aio_context);
3947 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
3951 if (!QTAILQ_IN_USE(bs, monitor_list)) {
3952 error_setg(errp, "Node %s is not owned by the monitor",
3957 if (bs->refcnt > 1) {
3958 error_setg(errp, "Block device %s is in use",
3959 bdrv_get_device_or_node_name(bs));
3963 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3967 aio_context_release(aio_context);
3970 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
3971 const char *child_name)
3975 QLIST_FOREACH(child, &parent_bs->children, next) {
3976 if (strcmp(child->name, child_name) == 0) {
3984 void qmp_x_blockdev_change(const char *parent, bool has_child,
3985 const char *child, bool has_node,
3986 const char *node, Error **errp)
3988 BlockDriverState *parent_bs, *new_bs = NULL;
3991 parent_bs = bdrv_lookup_bs(parent, parent, errp);
3996 if (has_child == has_node) {
3998 error_setg(errp, "The parameters child and node are in conflict");
4000 error_setg(errp, "Either child or node must be specified");
4006 p_child = bdrv_find_child(parent_bs, child);
4008 error_setg(errp, "Node '%s' does not have child '%s'",
4012 bdrv_del_child(parent_bs, p_child, errp);
4016 new_bs = bdrv_find_node(node);
4018 error_setg(errp, "Node '%s' not found", node);
4021 bdrv_add_child(parent_bs, new_bs, errp);
4025 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4027 BlockJobInfoList *head = NULL, **p_next = &head;
4030 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
4031 BlockJobInfoList *elem;
4032 AioContext *aio_context;
4034 if (block_job_is_internal(job)) {
4037 elem = g_new0(BlockJobInfoList, 1);
4038 aio_context = blk_get_aio_context(job->blk);
4039 aio_context_acquire(aio_context);
4040 elem->value = block_job_query(job, errp);
4041 aio_context_release(aio_context);
4044 qapi_free_BlockJobInfoList(head);
4048 p_next = &elem->next;
4054 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
4055 bool has_force, bool force, Error **errp)
4057 AioContext *old_context;
4058 AioContext *new_context;
4059 BlockDriverState *bs;
4061 bs = bdrv_find_node(node_name);
4063 error_setg(errp, "Cannot find node %s", node_name);
4067 /* Protects against accidents. */
4068 if (!(has_force && force) && bdrv_has_blk(bs)) {
4069 error_setg(errp, "Node %s is associated with a BlockBackend and could "
4070 "be in use (use force=true to override this check)",
4075 if (iothread->type == QTYPE_QSTRING) {
4076 IOThread *obj = iothread_by_id(iothread->u.s);
4078 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
4082 new_context = iothread_get_aio_context(obj);
4084 new_context = qemu_get_aio_context();
4087 old_context = bdrv_get_aio_context(bs);
4088 aio_context_acquire(old_context);
4090 bdrv_try_set_aio_context(bs, new_context, errp);
4092 aio_context_release(old_context);
4095 QemuOptsList qemu_common_drive_opts = {
4097 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4101 .type = QEMU_OPT_BOOL,
4102 .help = "enable/disable snapshot mode",
4105 .type = QEMU_OPT_STRING,
4106 .help = "host AIO implementation (threads, native, io_uring)",
4108 .name = BDRV_OPT_CACHE_WB,
4109 .type = QEMU_OPT_BOOL,
4110 .help = "Enable writeback mode",
4113 .type = QEMU_OPT_STRING,
4114 .help = "disk format (raw, qcow2, ...)",
4117 .type = QEMU_OPT_STRING,
4118 .help = "read error action",
4121 .type = QEMU_OPT_STRING,
4122 .help = "write error action",
4124 .name = BDRV_OPT_READ_ONLY,
4125 .type = QEMU_OPT_BOOL,
4126 .help = "open drive file as read-only",
4132 .name = "throttling.group",
4133 .type = QEMU_OPT_STRING,
4134 .help = "name of the block throttling group",
4136 .name = "copy-on-read",
4137 .type = QEMU_OPT_BOOL,
4138 .help = "copy read data from backing file into image file",
4140 .name = "detect-zeroes",
4141 .type = QEMU_OPT_STRING,
4142 .help = "try to optimize zero writes (off, on, unmap)",
4144 .name = "stats-account-invalid",
4145 .type = QEMU_OPT_BOOL,
4146 .help = "whether to account for invalid I/O operations "
4147 "in the statistics",
4149 .name = "stats-account-failed",
4150 .type = QEMU_OPT_BOOL,
4151 .help = "whether to account for failed I/O operations "
4152 "in the statistics",
4154 { /* end of list */ }
4158 QemuOptsList qemu_drive_opts = {
4160 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4163 * no elements => accept any params
4164 * validation will happen later
4166 { /* end of list */ }