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/config-file.h"
44 #include "qapi/qapi-commands-block.h"
45 #include "qapi/qapi-commands-transaction.h"
46 #include "qapi/qapi-visit-block-core.h"
47 #include "qapi/qmp/qdict.h"
48 #include "qapi/qmp/qnum.h"
49 #include "qapi/qmp/qstring.h"
50 #include "qapi/error.h"
51 #include "qapi/qmp/qerror.h"
52 #include "qapi/qmp/qlist.h"
53 #include "qapi/qobject-output-visitor.h"
54 #include "sysemu/sysemu.h"
55 #include "sysemu/iothread.h"
56 #include "block/block_int.h"
57 #include "block/trace.h"
58 #include "sysemu/arch_init.h"
59 #include "sysemu/qtest.h"
60 #include "qemu/cutils.h"
61 #include "qemu/help_option.h"
62 #include "qemu/throttle-options.h"
64 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
65 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
67 static int do_open_tray(const char *blk_name, const char *qdev_id,
68 bool force, Error **errp);
69 static void blockdev_remove_medium(bool has_device, const char *device,
70 bool has_id, const char *id, Error **errp);
71 static void blockdev_insert_medium(bool has_device, const char *device,
72 bool has_id, const char *id,
73 const char *node_name, Error **errp);
75 static const char *const if_name[IF_COUNT] = {
79 [IF_FLOPPY] = "floppy",
80 [IF_PFLASH] = "pflash",
83 [IF_VIRTIO] = "virtio",
87 static int if_max_devs[IF_COUNT] = {
89 * Do not change these numbers! They govern how drive option
90 * index maps to unit and bus. That mapping is ABI.
92 * All controllers used to implement if=T drives need to support
93 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
94 * Otherwise, some index values map to "impossible" bus, unit
97 * For instance, if you change [IF_SCSI] to 255, -drive
98 * if=scsi,index=12 no longer means bus=1,unit=5, but
99 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
100 * the drive can't be set up. Regression.
107 * Boards may call this to offer board-by-board overrides
108 * of the default, global values.
110 void override_max_devs(BlockInterfaceType type, int max_devs)
119 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
120 dinfo = blk_legacy_dinfo(blk);
121 if (dinfo->type == type) {
122 fprintf(stderr, "Cannot override units-per-bus property of"
123 " the %s interface, because a drive of that type has"
124 " already been added.\n", if_name[type]);
125 g_assert_not_reached();
129 if_max_devs[type] = max_devs;
133 * We automatically delete the drive when a device using it gets
134 * unplugged. Questionable feature, but we can't just drop it.
135 * Device models call blockdev_mark_auto_del() to schedule the
136 * automatic deletion, and generic qdev code calls blockdev_auto_del()
137 * when deletion is actually safe.
139 void blockdev_mark_auto_del(BlockBackend *blk)
141 DriveInfo *dinfo = blk_legacy_dinfo(blk);
142 BlockDriverState *bs = blk_bs(blk);
143 AioContext *aio_context;
150 aio_context = bdrv_get_aio_context(bs);
151 aio_context_acquire(aio_context);
154 job_cancel(&bs->job->job, false);
157 aio_context_release(aio_context);
163 void blockdev_auto_del(BlockBackend *blk)
165 DriveInfo *dinfo = blk_legacy_dinfo(blk);
167 if (dinfo && dinfo->auto_del) {
168 monitor_remove_blk(blk);
174 * Returns the current mapping of how many units per bus
175 * a particular interface can support.
177 * A positive integer indicates n units per bus.
178 * 0 implies the mapping has not been established.
179 * -1 indicates an invalid BlockInterfaceType was given.
181 int drive_get_max_devs(BlockInterfaceType type)
183 if (type >= IF_IDE && type < IF_COUNT) {
184 return if_max_devs[type];
190 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
192 int max_devs = if_max_devs[type];
193 return max_devs ? index / max_devs : 0;
196 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
198 int max_devs = if_max_devs[type];
199 return max_devs ? index % max_devs : index;
202 QemuOpts *drive_def(const char *optstr)
204 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
207 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
212 opts = drive_def(optstr);
216 if (type != IF_DEFAULT) {
217 qemu_opt_set(opts, "if", if_name[type], &error_abort);
220 qemu_opt_set_number(opts, "index", index, &error_abort);
223 qemu_opt_set(opts, "file", file, &error_abort);
227 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
232 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
233 dinfo = blk_legacy_dinfo(blk);
234 if (dinfo && dinfo->type == type
235 && dinfo->bus == bus && dinfo->unit == unit) {
243 void drive_check_orphaned(void)
248 bool orphans = false;
250 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
251 dinfo = blk_legacy_dinfo(blk);
252 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
253 dinfo->type != IF_NONE) {
255 qemu_opts_loc_restore(dinfo->opts);
256 error_report("machine type does not support"
257 " if=%s,bus=%d,unit=%d",
258 if_name[dinfo->type], dinfo->bus, dinfo->unit);
269 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
271 return drive_get(type,
272 drive_index_to_bus_id(type, index),
273 drive_index_to_unit_id(type, index));
276 int drive_get_max_bus(BlockInterfaceType type)
283 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
284 dinfo = blk_legacy_dinfo(blk);
285 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
286 max_bus = dinfo->bus;
292 /* Get a block device. This should only be used for single-drive devices
293 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
295 DriveInfo *drive_get_next(BlockInterfaceType type)
297 static int next_block_unit[IF_COUNT];
299 return drive_get(type, 0, next_block_unit[type]++);
302 static void bdrv_format_print(void *opaque, const char *name)
304 error_printf(" %s", name);
309 BlockDriverState *bs;
312 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
314 if (!strcmp(buf, "ignore")) {
315 return BLOCKDEV_ON_ERROR_IGNORE;
316 } else if (!is_read && !strcmp(buf, "enospc")) {
317 return BLOCKDEV_ON_ERROR_ENOSPC;
318 } else if (!strcmp(buf, "stop")) {
319 return BLOCKDEV_ON_ERROR_STOP;
320 } else if (!strcmp(buf, "report")) {
321 return BLOCKDEV_ON_ERROR_REPORT;
323 error_setg(errp, "'%s' invalid %s error action",
324 buf, is_read ? "read" : "write");
329 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
332 const QListEntry *entry;
333 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
334 switch (qobject_type(entry->value)) {
336 case QTYPE_QSTRING: {
337 unsigned long long length;
338 const char *str = qstring_get_str(qobject_to(QString,
340 if (parse_uint_full(str, &length, 10) == 0 &&
341 length > 0 && length <= UINT_MAX) {
342 block_acct_add_interval(stats, (unsigned) length);
344 error_setg(errp, "Invalid interval length: %s", str);
351 int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
353 if (length > 0 && length <= UINT_MAX) {
354 block_acct_add_interval(stats, (unsigned) length);
356 error_setg(errp, "Invalid interval length: %" PRId64, length);
363 error_setg(errp, "The specification of stats-intervals is invalid");
370 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
372 /* All parameters but @opts are optional and may be set to NULL. */
373 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
374 const char **throttling_group, ThrottleConfig *throttle_cfg,
375 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
377 Error *local_error = NULL;
381 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
382 *bdrv_flags |= BDRV_O_COPY_ON_READ;
385 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
386 if (!strcmp(aio, "native")) {
387 *bdrv_flags |= BDRV_O_NATIVE_AIO;
388 } else if (!strcmp(aio, "threads")) {
389 /* this is the default */
391 error_setg(errp, "invalid aio option");
397 /* disk I/O throttling */
398 if (throttling_group) {
399 *throttling_group = qemu_opt_get(opts, "throttling.group");
403 throttle_config_init(throttle_cfg);
404 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
405 qemu_opt_get_number(opts, "throttling.bps-total", 0);
406 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
407 qemu_opt_get_number(opts, "throttling.bps-read", 0);
408 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
409 qemu_opt_get_number(opts, "throttling.bps-write", 0);
410 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
411 qemu_opt_get_number(opts, "throttling.iops-total", 0);
412 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
413 qemu_opt_get_number(opts, "throttling.iops-read", 0);
414 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
415 qemu_opt_get_number(opts, "throttling.iops-write", 0);
417 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
418 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
419 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
420 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
421 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
422 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
423 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
424 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
425 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
426 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
427 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
428 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
430 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
431 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
432 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
433 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
434 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
435 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
436 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
437 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
438 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
439 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
440 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
441 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
443 throttle_cfg->op_size =
444 qemu_opt_get_number(opts, "throttling.iops-size", 0);
446 if (!throttle_is_valid(throttle_cfg, errp)) {
453 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
454 qemu_opt_get(opts, "detect-zeroes"),
455 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
458 error_propagate(errp, local_error);
464 /* Takes the ownership of bs_opts */
465 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
470 int on_read_error, on_write_error;
471 bool account_invalid, account_failed;
472 bool writethrough, read_only;
474 BlockDriverState *bs;
479 QDict *interval_dict = NULL;
480 QList *interval_list = NULL;
482 BlockdevDetectZeroesOptions detect_zeroes =
483 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
484 const char *throttling_group = NULL;
486 /* Check common options by copying from bs_opts to opts, all other options
487 * stay in bs_opts for processing by bdrv_open(). */
488 id = qdict_get_try_str(bs_opts, "id");
489 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
491 error_propagate(errp, error);
495 qemu_opts_absorb_qdict(opts, bs_opts, &error);
497 error_propagate(errp, error);
502 qdict_del(bs_opts, "id");
505 /* extract parameters */
506 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
508 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
509 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
511 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
513 id = qemu_opts_id(opts);
515 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
516 qdict_array_split(interval_dict, &interval_list);
518 if (qdict_size(interval_dict) != 0) {
519 error_setg(errp, "Invalid option stats-intervals.%s",
520 qdict_first(interval_dict)->key);
524 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
525 &detect_zeroes, &error);
527 error_propagate(errp, error);
531 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
532 if (is_help_option(buf)) {
533 error_printf("Supported formats:");
534 bdrv_iterate_format(bdrv_format_print, NULL);
539 if (qdict_haskey(bs_opts, "driver")) {
540 error_setg(errp, "Cannot specify both 'driver' and 'format'");
543 qdict_put_str(bs_opts, "driver", buf);
546 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
547 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
548 on_write_error = parse_block_error_action(buf, 0, &error);
550 error_propagate(errp, error);
555 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
556 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
557 on_read_error = parse_block_error_action(buf, 1, &error);
559 error_propagate(errp, error);
565 bdrv_flags |= BDRV_O_SNAPSHOT;
568 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
571 if ((!file || !*file) && !qdict_size(bs_opts)) {
572 BlockBackendRootState *blk_rs;
574 blk = blk_new(0, BLK_PERM_ALL);
575 blk_rs = blk_get_root_state(blk);
576 blk_rs->open_flags = bdrv_flags;
577 blk_rs->read_only = read_only;
578 blk_rs->detect_zeroes = detect_zeroes;
580 qobject_unref(bs_opts);
582 if (file && !*file) {
586 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
587 * with other callers) rather than what we want as the real defaults.
588 * Apply the defaults here instead. */
589 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
590 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
591 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
592 read_only ? "on" : "off");
593 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
595 if (runstate_check(RUN_STATE_INMIGRATE)) {
596 bdrv_flags |= BDRV_O_INACTIVE;
599 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
605 bs->detect_zeroes = detect_zeroes;
607 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
609 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
616 /* disk I/O throttling */
617 if (throttle_enabled(&cfg)) {
618 if (!throttling_group) {
619 throttling_group = id;
621 blk_io_limits_enable(blk, throttling_group);
622 blk_set_io_limits(blk, &cfg);
625 blk_set_enable_write_cache(blk, !writethrough);
626 blk_set_on_error(blk, on_read_error, on_write_error);
628 if (!monitor_add_blk(blk, id, errp)) {
636 qobject_unref(interval_dict);
637 qobject_unref(interval_list);
642 qobject_unref(interval_dict);
643 qobject_unref(interval_list);
645 qobject_unref(bs_opts);
649 /* Takes the ownership of bs_opts */
650 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
654 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
655 * with other callers) rather than what we want as the real defaults.
656 * Apply the defaults here instead. */
657 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
658 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
659 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
661 if (runstate_check(RUN_STATE_INMIGRATE)) {
662 bdrv_flags |= BDRV_O_INACTIVE;
665 return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
668 void blockdev_close_all_bdrv_states(void)
670 BlockDriverState *bs, *next_bs;
672 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
673 AioContext *ctx = bdrv_get_aio_context(bs);
675 aio_context_acquire(ctx);
677 aio_context_release(ctx);
681 /* Iterates over the list of monitor-owned BlockDriverStates */
682 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
684 return bs ? QTAILQ_NEXT(bs, monitor_list)
685 : QTAILQ_FIRST(&monitor_bdrv_states);
688 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
693 value = qemu_opt_get(opts, from);
695 if (qemu_opt_find(opts, to)) {
696 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
697 "same time", to, from);
702 /* rename all items in opts */
703 while ((value = qemu_opt_get(opts, from))) {
704 qemu_opt_set(opts, to, value, &error_abort);
705 qemu_opt_unset(opts, from);
709 QemuOptsList qemu_legacy_drive_opts = {
711 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
715 .type = QEMU_OPT_NUMBER,
716 .help = "bus number",
719 .type = QEMU_OPT_NUMBER,
720 .help = "unit number (i.e. lun for scsi)",
723 .type = QEMU_OPT_NUMBER,
724 .help = "index number",
727 .type = QEMU_OPT_STRING,
728 .help = "media type (disk, cdrom)",
731 .type = QEMU_OPT_STRING,
732 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
735 .type = QEMU_OPT_STRING,
736 .help = "disk serial number",
739 .type = QEMU_OPT_STRING,
743 /* Options that are passed on, but have special semantics with -drive */
745 .name = BDRV_OPT_READ_ONLY,
746 .type = QEMU_OPT_BOOL,
747 .help = "open drive file as read-only",
750 .type = QEMU_OPT_STRING,
751 .help = "read error action",
754 .type = QEMU_OPT_STRING,
755 .help = "write error action",
757 .name = "copy-on-read",
758 .type = QEMU_OPT_BOOL,
759 .help = "copy read data from backing file into image file",
762 { /* end of list */ }
766 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
770 DriveInfo *dinfo = NULL;
772 QemuOpts *legacy_opts;
773 DriveMediaType media = MEDIA_DISK;
774 BlockInterfaceType type;
775 int max_devs, bus_id, unit_id, index;
776 const char *werror, *rerror;
777 bool read_only = false;
780 const char *filename;
781 Error *local_err = NULL;
783 const char *deprecated[] = {
787 /* Change legacy command line options into QMP ones */
788 static const struct {
792 { "iops", "throttling.iops-total" },
793 { "iops_rd", "throttling.iops-read" },
794 { "iops_wr", "throttling.iops-write" },
796 { "bps", "throttling.bps-total" },
797 { "bps_rd", "throttling.bps-read" },
798 { "bps_wr", "throttling.bps-write" },
800 { "iops_max", "throttling.iops-total-max" },
801 { "iops_rd_max", "throttling.iops-read-max" },
802 { "iops_wr_max", "throttling.iops-write-max" },
804 { "bps_max", "throttling.bps-total-max" },
805 { "bps_rd_max", "throttling.bps-read-max" },
806 { "bps_wr_max", "throttling.bps-write-max" },
808 { "iops_size", "throttling.iops-size" },
810 { "group", "throttling.group" },
812 { "readonly", BDRV_OPT_READ_ONLY },
815 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
816 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
819 error_report_err(local_err);
824 value = qemu_opt_get(all_opts, "cache");
829 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
830 error_report("invalid cache option");
834 /* Specific options take precedence */
835 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
836 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
837 !writethrough, &error_abort);
839 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
840 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
841 !!(flags & BDRV_O_NOCACHE), &error_abort);
843 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
844 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
845 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
847 qemu_opt_unset(all_opts, "cache");
850 /* Get a QDict for processing the options */
851 bs_opts = qdict_new();
852 qemu_opts_to_qdict(all_opts, bs_opts);
854 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
856 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
858 error_report_err(local_err);
862 /* Other deprecated options */
863 if (!qtest_enabled()) {
864 for (i = 0; i < ARRAY_SIZE(deprecated); i++) {
865 if (qemu_opt_get(legacy_opts, deprecated[i]) != NULL) {
866 error_report("'%s' is deprecated, please use the corresponding "
867 "option of '-device' instead", deprecated[i]);
873 value = qemu_opt_get(legacy_opts, "media");
875 if (!strcmp(value, "disk")) {
877 } else if (!strcmp(value, "cdrom")) {
881 error_report("'%s' invalid media", value);
886 /* copy-on-read is disabled with a warning for read-only devices */
887 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
888 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
890 if (read_only && copy_on_read) {
891 warn_report("disabling copy-on-read on read-only drive");
892 copy_on_read = false;
895 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
896 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
898 /* Controller type */
899 value = qemu_opt_get(legacy_opts, "if");
902 type < IF_COUNT && strcmp(value, if_name[type]);
905 if (type == IF_COUNT) {
906 error_report("unsupported bus type '%s'", value);
910 type = block_default_type;
913 /* Device address specified by bus/unit or index.
914 * If none was specified, try to find the first free one. */
915 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
916 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
917 index = qemu_opt_get_number(legacy_opts, "index", -1);
919 max_devs = if_max_devs[type];
922 if (bus_id != 0 || unit_id != -1) {
923 error_report("index cannot be used with bus and unit");
926 bus_id = drive_index_to_bus_id(type, index);
927 unit_id = drive_index_to_unit_id(type, index);
932 while (drive_get(type, bus_id, unit_id) != NULL) {
934 if (max_devs && unit_id >= max_devs) {
941 if (max_devs && unit_id >= max_devs) {
942 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
946 if (drive_get(type, bus_id, unit_id) != NULL) {
947 error_report("drive with bus=%d, unit=%d (index=%d) exists",
948 bus_id, unit_id, index);
953 serial = qemu_opt_get(legacy_opts, "serial");
955 /* no id supplied -> create one */
956 if (qemu_opts_id(all_opts) == NULL) {
958 const char *mediastr = "";
959 if (type == IF_IDE || type == IF_SCSI) {
960 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
963 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
966 new_id = g_strdup_printf("%s%s%i", if_name[type],
969 qdict_put_str(bs_opts, "id", new_id);
973 /* Add virtio block device */
974 if (type == IF_VIRTIO) {
976 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
978 if (arch_type == QEMU_ARCH_S390X) {
979 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
981 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
983 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
987 filename = qemu_opt_get(legacy_opts, "file");
989 /* Check werror/rerror compatibility with if=... */
990 werror = qemu_opt_get(legacy_opts, "werror");
991 if (werror != NULL) {
992 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
994 error_report("werror is not supported by this bus type");
997 qdict_put_str(bs_opts, "werror", werror);
1000 rerror = qemu_opt_get(legacy_opts, "rerror");
1001 if (rerror != NULL) {
1002 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1004 error_report("rerror is not supported by this bus type");
1007 qdict_put_str(bs_opts, "rerror", rerror);
1010 /* Actual block device init: Functionality shared with blockdev-add */
1011 blk = blockdev_init(filename, bs_opts, &local_err);
1015 error_report_err(local_err);
1022 /* Create legacy DriveInfo */
1023 dinfo = g_malloc0(sizeof(*dinfo));
1024 dinfo->opts = all_opts;
1027 dinfo->bus = bus_id;
1028 dinfo->unit = unit_id;
1029 dinfo->serial = g_strdup(serial);
1031 blk_set_legacy_dinfo(blk, dinfo);
1038 dinfo->media_cd = media == MEDIA_CDROM;
1045 qemu_opts_del(legacy_opts);
1046 qobject_unref(bs_opts);
1050 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1052 BlockDriverState *bs;
1054 bs = bdrv_lookup_bs(name, name, errp);
1059 if (!bdrv_is_root_node(bs)) {
1060 error_setg(errp, "Need a root block node");
1064 if (!bdrv_is_inserted(bs)) {
1065 error_setg(errp, "Device has no medium");
1072 static BlockBackend *qmp_get_blk(const char *blk_name, const char *qdev_id,
1077 if (!blk_name == !qdev_id) {
1078 error_setg(errp, "Need exactly one of 'device' and 'id'");
1083 blk = blk_by_qdev_id(qdev_id, errp);
1085 blk = blk_by_name(blk_name);
1087 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1088 "Device '%s' not found", blk_name);
1095 void hmp_commit(Monitor *mon, const QDict *qdict)
1097 const char *device = qdict_get_str(qdict, "device");
1101 if (!strcmp(device, "all")) {
1102 ret = blk_commit_all();
1104 BlockDriverState *bs;
1105 AioContext *aio_context;
1107 blk = blk_by_name(device);
1109 monitor_printf(mon, "Device '%s' not found\n", device);
1112 if (!blk_is_available(blk)) {
1113 monitor_printf(mon, "Device '%s' has no medium\n", device);
1118 aio_context = bdrv_get_aio_context(bs);
1119 aio_context_acquire(aio_context);
1121 ret = bdrv_commit(bs);
1123 aio_context_release(aio_context);
1126 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1131 static void blockdev_do_action(TransactionAction *action, Error **errp)
1133 TransactionActionList list;
1135 list.value = action;
1137 qmp_transaction(&list, false, NULL, errp);
1140 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1141 bool has_node_name, const char *node_name,
1142 const char *snapshot_file,
1143 bool has_snapshot_node_name,
1144 const char *snapshot_node_name,
1145 bool has_format, const char *format,
1146 bool has_mode, NewImageMode mode, Error **errp)
1148 BlockdevSnapshotSync snapshot = {
1149 .has_device = has_device,
1150 .device = (char *) device,
1151 .has_node_name = has_node_name,
1152 .node_name = (char *) node_name,
1153 .snapshot_file = (char *) snapshot_file,
1154 .has_snapshot_node_name = has_snapshot_node_name,
1155 .snapshot_node_name = (char *) snapshot_node_name,
1156 .has_format = has_format,
1157 .format = (char *) format,
1158 .has_mode = has_mode,
1161 TransactionAction action = {
1162 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1163 .u.blockdev_snapshot_sync.data = &snapshot,
1165 blockdev_do_action(&action, errp);
1168 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1171 BlockdevSnapshot snapshot_data = {
1172 .node = (char *) node,
1173 .overlay = (char *) overlay
1175 TransactionAction action = {
1176 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1177 .u.blockdev_snapshot.data = &snapshot_data,
1179 blockdev_do_action(&action, errp);
1182 void qmp_blockdev_snapshot_internal_sync(const char *device,
1186 BlockdevSnapshotInternal snapshot = {
1187 .device = (char *) device,
1188 .name = (char *) name
1190 TransactionAction action = {
1191 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1192 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1194 blockdev_do_action(&action, errp);
1197 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1204 BlockDriverState *bs;
1205 AioContext *aio_context;
1206 QEMUSnapshotInfo sn;
1207 Error *local_err = NULL;
1208 SnapshotInfo *info = NULL;
1211 bs = qmp_get_root_bs(device, errp);
1215 aio_context = bdrv_get_aio_context(bs);
1216 aio_context_acquire(aio_context);
1227 error_setg(errp, "Name or id must be provided");
1228 goto out_aio_context;
1231 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1232 goto out_aio_context;
1235 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1237 error_propagate(errp, local_err);
1238 goto out_aio_context;
1242 "Snapshot with id '%s' and name '%s' does not exist on "
1244 STR_OR_NULL(id), STR_OR_NULL(name), device);
1245 goto out_aio_context;
1248 bdrv_snapshot_delete(bs, id, name, &local_err);
1250 error_propagate(errp, local_err);
1251 goto out_aio_context;
1254 aio_context_release(aio_context);
1256 info = g_new0(SnapshotInfo, 1);
1257 info->id = g_strdup(sn.id_str);
1258 info->name = g_strdup(sn.name);
1259 info->date_nsec = sn.date_nsec;
1260 info->date_sec = sn.date_sec;
1261 info->vm_state_size = sn.vm_state_size;
1262 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1263 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1268 aio_context_release(aio_context);
1273 * block_dirty_bitmap_lookup:
1274 * Return a dirty bitmap (if present), after validating
1275 * the node reference and bitmap names.
1277 * @node: The name of the BDS node to search for bitmaps
1278 * @name: The name of the bitmap to search for
1279 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1280 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1281 * @errp: Output pointer for error information. Can be NULL.
1283 * @return: A bitmap object on success, or NULL on failure.
1285 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1287 BlockDriverState **pbs,
1290 BlockDriverState *bs;
1291 BdrvDirtyBitmap *bitmap;
1294 error_setg(errp, "Node cannot be NULL");
1298 error_setg(errp, "Bitmap name cannot be NULL");
1301 bs = bdrv_lookup_bs(node, node, NULL);
1303 error_setg(errp, "Node '%s' not found", node);
1307 bitmap = bdrv_find_dirty_bitmap(bs, name);
1309 error_setg(errp, "Dirty bitmap '%s' not found", name);
1320 /* New and old BlockDriverState structs for atomic group operations */
1322 typedef struct BlkActionState BlkActionState;
1326 * Table of operations that define an Action.
1328 * @instance_size: Size of state struct, in bytes.
1329 * @prepare: Prepare the work, must NOT be NULL.
1330 * @commit: Commit the changes, can be NULL.
1331 * @abort: Abort the changes on fail, can be NULL.
1332 * @clean: Clean up resources after all transaction actions have called
1333 * commit() or abort(). Can be NULL.
1335 * Only prepare() may fail. In a single transaction, only one of commit() or
1336 * abort() will be called. clean() will always be called if it is present.
1338 typedef struct BlkActionOps {
1339 size_t instance_size;
1340 void (*prepare)(BlkActionState *common, Error **errp);
1341 void (*commit)(BlkActionState *common);
1342 void (*abort)(BlkActionState *common);
1343 void (*clean)(BlkActionState *common);
1348 * Describes one Action's state within a Transaction.
1350 * @action: QAPI-defined enum identifying which Action to perform.
1351 * @ops: Table of ActionOps this Action can perform.
1352 * @block_job_txn: Transaction which this action belongs to.
1353 * @entry: List membership for all Actions in this Transaction.
1355 * This structure must be arranged as first member in a subclassed type,
1356 * assuming that the compiler will also arrange it to the same offsets as the
1359 struct BlkActionState {
1360 TransactionAction *action;
1361 const BlkActionOps *ops;
1362 JobTxn *block_job_txn;
1363 TransactionProperties *txn_props;
1364 QSIMPLEQ_ENTRY(BlkActionState) entry;
1367 /* internal snapshot private data */
1368 typedef struct InternalSnapshotState {
1369 BlkActionState common;
1370 BlockDriverState *bs;
1371 QEMUSnapshotInfo sn;
1373 } InternalSnapshotState;
1376 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1378 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1380 "Action '%s' does not support Transaction property "
1381 "completion-mode = %s",
1382 TransactionActionKind_str(s->action->type),
1383 ActionCompletionMode_str(s->txn_props->completion_mode));
1389 static void internal_snapshot_prepare(BlkActionState *common,
1392 Error *local_err = NULL;
1395 BlockDriverState *bs;
1396 QEMUSnapshotInfo old_sn, *sn;
1399 BlockdevSnapshotInternal *internal;
1400 InternalSnapshotState *state;
1401 AioContext *aio_context;
1404 g_assert(common->action->type ==
1405 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1406 internal = common->action->u.blockdev_snapshot_internal_sync.data;
1407 state = DO_UPCAST(InternalSnapshotState, common, common);
1409 /* 1. parse input */
1410 device = internal->device;
1411 name = internal->name;
1413 /* 2. check for validation */
1414 if (action_check_completion_mode(common, errp) < 0) {
1418 bs = qmp_get_root_bs(device, errp);
1423 aio_context = bdrv_get_aio_context(bs);
1424 aio_context_acquire(aio_context);
1428 /* Paired with .clean() */
1429 bdrv_drained_begin(bs);
1431 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1435 if (bdrv_is_read_only(bs)) {
1436 error_setg(errp, "Device '%s' is read only", device);
1440 if (!bdrv_can_snapshot(bs)) {
1441 error_setg(errp, "Block format '%s' used by device '%s' "
1442 "does not support internal snapshots",
1443 bs->drv->format_name, device);
1447 if (!strlen(name)) {
1448 error_setg(errp, "Name is empty");
1452 /* check whether a snapshot with name exist */
1453 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1456 error_propagate(errp, local_err);
1460 "Snapshot with name '%s' already exists on device '%s'",
1465 /* 3. take the snapshot */
1467 pstrcpy(sn->name, sizeof(sn->name), name);
1468 qemu_gettimeofday(&tv);
1469 sn->date_sec = tv.tv_sec;
1470 sn->date_nsec = tv.tv_usec * 1000;
1471 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1473 ret1 = bdrv_snapshot_create(bs, sn);
1475 error_setg_errno(errp, -ret1,
1476 "Failed to create snapshot '%s' on device '%s'",
1481 /* 4. succeed, mark a snapshot is created */
1482 state->created = true;
1485 aio_context_release(aio_context);
1488 static void internal_snapshot_abort(BlkActionState *common)
1490 InternalSnapshotState *state =
1491 DO_UPCAST(InternalSnapshotState, common, common);
1492 BlockDriverState *bs = state->bs;
1493 QEMUSnapshotInfo *sn = &state->sn;
1494 AioContext *aio_context;
1495 Error *local_error = NULL;
1497 if (!state->created) {
1501 aio_context = bdrv_get_aio_context(state->bs);
1502 aio_context_acquire(aio_context);
1504 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1505 error_reportf_err(local_error,
1506 "Failed to delete snapshot with id '%s' and "
1507 "name '%s' on device '%s' in abort: ",
1508 sn->id_str, sn->name,
1509 bdrv_get_device_name(bs));
1512 aio_context_release(aio_context);
1515 static void internal_snapshot_clean(BlkActionState *common)
1517 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1519 AioContext *aio_context;
1525 aio_context = bdrv_get_aio_context(state->bs);
1526 aio_context_acquire(aio_context);
1528 bdrv_drained_end(state->bs);
1530 aio_context_release(aio_context);
1533 /* external snapshot private data */
1534 typedef struct ExternalSnapshotState {
1535 BlkActionState common;
1536 BlockDriverState *old_bs;
1537 BlockDriverState *new_bs;
1538 bool overlay_appended;
1539 } ExternalSnapshotState;
1541 static void external_snapshot_prepare(BlkActionState *common,
1545 QDict *options = NULL;
1546 Error *local_err = NULL;
1547 /* Device and node name of the image to generate the snapshot from */
1549 const char *node_name;
1550 /* Reference to the new image (for 'blockdev-snapshot') */
1551 const char *snapshot_ref;
1552 /* File name of the new image (for 'blockdev-snapshot-sync') */
1553 const char *new_image_file;
1554 ExternalSnapshotState *state =
1555 DO_UPCAST(ExternalSnapshotState, common, common);
1556 TransactionAction *action = common->action;
1557 AioContext *aio_context;
1559 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1560 * purpose but a different set of parameters */
1561 switch (action->type) {
1562 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1564 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1566 node_name = s->node;
1567 new_image_file = NULL;
1568 snapshot_ref = s->overlay;
1571 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1573 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1574 device = s->has_device ? s->device : NULL;
1575 node_name = s->has_node_name ? s->node_name : NULL;
1576 new_image_file = s->snapshot_file;
1577 snapshot_ref = NULL;
1581 g_assert_not_reached();
1584 /* start processing */
1585 if (action_check_completion_mode(common, errp) < 0) {
1589 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1590 if (!state->old_bs) {
1594 aio_context = bdrv_get_aio_context(state->old_bs);
1595 aio_context_acquire(aio_context);
1597 /* Paired with .clean() */
1598 bdrv_drained_begin(state->old_bs);
1600 if (!bdrv_is_inserted(state->old_bs)) {
1601 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1605 if (bdrv_op_is_blocked(state->old_bs,
1606 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1610 if (!bdrv_is_read_only(state->old_bs)) {
1611 if (bdrv_flush(state->old_bs)) {
1612 error_setg(errp, QERR_IO_ERROR);
1617 if (!bdrv_is_first_non_filter(state->old_bs)) {
1618 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1622 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1623 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1624 const char *format = s->has_format ? s->format : "qcow2";
1625 enum NewImageMode mode;
1626 const char *snapshot_node_name =
1627 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1629 if (node_name && !snapshot_node_name) {
1630 error_setg(errp, "New snapshot node name missing");
1634 if (snapshot_node_name &&
1635 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1636 error_setg(errp, "New snapshot node name already in use");
1640 flags = state->old_bs->open_flags;
1641 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1642 flags |= BDRV_O_NO_BACKING;
1644 /* create new image w/backing file */
1645 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1646 if (mode != NEW_IMAGE_MODE_EXISTING) {
1647 int64_t size = bdrv_getlength(state->old_bs);
1649 error_setg_errno(errp, -size, "bdrv_getlength failed");
1652 bdrv_img_create(new_image_file, format,
1653 state->old_bs->filename,
1654 state->old_bs->drv->format_name,
1655 NULL, size, flags, false, &local_err);
1657 error_propagate(errp, local_err);
1662 options = qdict_new();
1663 if (s->has_snapshot_node_name) {
1664 qdict_put_str(options, "node-name", snapshot_node_name);
1666 qdict_put_str(options, "driver", format);
1669 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1671 /* We will manually add the backing_hd field to the bs later */
1672 if (!state->new_bs) {
1676 if (bdrv_has_blk(state->new_bs)) {
1677 error_setg(errp, "The snapshot is already in use");
1681 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1686 if (state->new_bs->backing != NULL) {
1687 error_setg(errp, "The snapshot already has a backing image");
1691 if (!state->new_bs->drv->supports_backing) {
1692 error_setg(errp, "The snapshot does not support backing images");
1696 bdrv_set_aio_context(state->new_bs, aio_context);
1698 /* This removes our old bs and adds the new bs. This is an operation that
1699 * can fail, so we need to do it in .prepare; undoing it for abort is
1700 * always possible. */
1701 bdrv_ref(state->new_bs);
1702 bdrv_append(state->new_bs, state->old_bs, &local_err);
1704 error_propagate(errp, local_err);
1707 state->overlay_appended = true;
1710 aio_context_release(aio_context);
1713 static void external_snapshot_commit(BlkActionState *common)
1715 ExternalSnapshotState *state =
1716 DO_UPCAST(ExternalSnapshotState, common, common);
1717 AioContext *aio_context;
1719 aio_context = bdrv_get_aio_context(state->old_bs);
1720 aio_context_acquire(aio_context);
1722 /* We don't need (or want) to use the transactional
1723 * bdrv_reopen_multiple() across all the entries at once, because we
1724 * don't want to abort all of them if one of them fails the reopen */
1725 if (!atomic_read(&state->old_bs->copy_on_read)) {
1726 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1730 aio_context_release(aio_context);
1733 static void external_snapshot_abort(BlkActionState *common)
1735 ExternalSnapshotState *state =
1736 DO_UPCAST(ExternalSnapshotState, common, common);
1737 if (state->new_bs) {
1738 if (state->overlay_appended) {
1739 AioContext *aio_context;
1741 aio_context = bdrv_get_aio_context(state->old_bs);
1742 aio_context_acquire(aio_context);
1744 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1745 close state->old_bs; we need it */
1746 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1747 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1748 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1750 aio_context_release(aio_context);
1755 static void external_snapshot_clean(BlkActionState *common)
1757 ExternalSnapshotState *state =
1758 DO_UPCAST(ExternalSnapshotState, common, common);
1759 AioContext *aio_context;
1761 if (!state->old_bs) {
1765 aio_context = bdrv_get_aio_context(state->old_bs);
1766 aio_context_acquire(aio_context);
1768 bdrv_drained_end(state->old_bs);
1769 bdrv_unref(state->new_bs);
1771 aio_context_release(aio_context);
1774 typedef struct DriveBackupState {
1775 BlkActionState common;
1776 BlockDriverState *bs;
1780 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
1783 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1785 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1786 BlockDriverState *bs;
1787 DriveBackup *backup;
1788 AioContext *aio_context;
1789 Error *local_err = NULL;
1791 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1792 backup = common->action->u.drive_backup.data;
1794 bs = qmp_get_root_bs(backup->device, errp);
1799 aio_context = bdrv_get_aio_context(bs);
1800 aio_context_acquire(aio_context);
1802 /* Paired with .clean() */
1803 bdrv_drained_begin(bs);
1807 state->job = do_drive_backup(backup, common->block_job_txn, &local_err);
1809 error_propagate(errp, local_err);
1814 aio_context_release(aio_context);
1817 static void drive_backup_commit(BlkActionState *common)
1819 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1820 AioContext *aio_context;
1822 aio_context = bdrv_get_aio_context(state->bs);
1823 aio_context_acquire(aio_context);
1826 job_start(&state->job->job);
1828 aio_context_release(aio_context);
1831 static void drive_backup_abort(BlkActionState *common)
1833 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1836 AioContext *aio_context;
1838 aio_context = bdrv_get_aio_context(state->bs);
1839 aio_context_acquire(aio_context);
1841 job_cancel_sync(&state->job->job);
1843 aio_context_release(aio_context);
1847 static void drive_backup_clean(BlkActionState *common)
1849 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1850 AioContext *aio_context;
1856 aio_context = bdrv_get_aio_context(state->bs);
1857 aio_context_acquire(aio_context);
1859 bdrv_drained_end(state->bs);
1861 aio_context_release(aio_context);
1864 typedef struct BlockdevBackupState {
1865 BlkActionState common;
1866 BlockDriverState *bs;
1868 } BlockdevBackupState;
1870 static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
1873 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1875 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1876 BlockdevBackup *backup;
1877 BlockDriverState *bs, *target;
1878 AioContext *aio_context;
1879 Error *local_err = NULL;
1881 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1882 backup = common->action->u.blockdev_backup.data;
1884 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1889 target = bdrv_lookup_bs(backup->target, backup->target, errp);
1894 aio_context = bdrv_get_aio_context(bs);
1895 if (aio_context != bdrv_get_aio_context(target)) {
1896 error_setg(errp, "Backup between two IO threads is not implemented");
1899 aio_context_acquire(aio_context);
1902 /* Paired with .clean() */
1903 bdrv_drained_begin(state->bs);
1905 state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
1907 error_propagate(errp, local_err);
1912 aio_context_release(aio_context);
1915 static void blockdev_backup_commit(BlkActionState *common)
1917 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1918 AioContext *aio_context;
1920 aio_context = bdrv_get_aio_context(state->bs);
1921 aio_context_acquire(aio_context);
1924 job_start(&state->job->job);
1926 aio_context_release(aio_context);
1929 static void blockdev_backup_abort(BlkActionState *common)
1931 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1934 AioContext *aio_context;
1936 aio_context = bdrv_get_aio_context(state->bs);
1937 aio_context_acquire(aio_context);
1939 job_cancel_sync(&state->job->job);
1941 aio_context_release(aio_context);
1945 static void blockdev_backup_clean(BlkActionState *common)
1947 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1948 AioContext *aio_context;
1954 aio_context = bdrv_get_aio_context(state->bs);
1955 aio_context_acquire(aio_context);
1957 bdrv_drained_end(state->bs);
1959 aio_context_release(aio_context);
1962 typedef struct BlockDirtyBitmapState {
1963 BlkActionState common;
1964 BdrvDirtyBitmap *bitmap;
1965 BlockDriverState *bs;
1969 } BlockDirtyBitmapState;
1971 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
1974 Error *local_err = NULL;
1975 BlockDirtyBitmapAdd *action;
1976 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
1979 if (action_check_completion_mode(common, errp) < 0) {
1983 action = common->action->u.block_dirty_bitmap_add.data;
1984 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1985 qmp_block_dirty_bitmap_add(action->node, action->name,
1986 action->has_granularity, action->granularity,
1987 action->has_persistent, action->persistent,
1988 action->has_autoload, action->autoload,
1989 action->has_x_disabled, action->x_disabled,
1993 state->prepared = true;
1995 error_propagate(errp, local_err);
1999 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2001 BlockDirtyBitmapAdd *action;
2002 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2005 action = common->action->u.block_dirty_bitmap_add.data;
2006 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2007 * then the node reference and bitmap name must have been valid.
2009 if (state->prepared) {
2010 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2014 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2017 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2019 BlockDirtyBitmap *action;
2021 if (action_check_completion_mode(common, errp) < 0) {
2025 action = common->action->u.block_dirty_bitmap_clear.data;
2026 state->bitmap = block_dirty_bitmap_lookup(action->node,
2030 if (!state->bitmap) {
2034 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2035 error_setg(errp, "Cannot modify a frozen bitmap");
2037 } else if (bdrv_dirty_bitmap_qmp_locked(state->bitmap)) {
2038 error_setg(errp, "Cannot modify a locked bitmap");
2040 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2041 error_setg(errp, "Cannot clear a disabled bitmap");
2043 } else if (bdrv_dirty_bitmap_readonly(state->bitmap)) {
2044 error_setg(errp, "Cannot clear a readonly bitmap");
2048 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2051 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2053 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2056 if (state->backup) {
2057 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2061 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2063 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2066 hbitmap_free(state->backup);
2069 static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
2072 BlockDirtyBitmap *action;
2073 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2076 if (action_check_completion_mode(common, errp) < 0) {
2080 action = common->action->u.x_block_dirty_bitmap_enable.data;
2081 state->bitmap = block_dirty_bitmap_lookup(action->node,
2085 if (!state->bitmap) {
2089 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2090 bdrv_enable_dirty_bitmap(state->bitmap);
2093 static void block_dirty_bitmap_enable_abort(BlkActionState *common)
2095 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2098 if (!state->was_enabled) {
2099 bdrv_disable_dirty_bitmap(state->bitmap);
2103 static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
2106 BlockDirtyBitmap *action;
2107 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2110 if (action_check_completion_mode(common, errp) < 0) {
2114 action = common->action->u.x_block_dirty_bitmap_disable.data;
2115 state->bitmap = block_dirty_bitmap_lookup(action->node,
2119 if (!state->bitmap) {
2123 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2124 bdrv_disable_dirty_bitmap(state->bitmap);
2127 static void block_dirty_bitmap_disable_abort(BlkActionState *common)
2129 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2132 if (state->was_enabled) {
2133 bdrv_enable_dirty_bitmap(state->bitmap);
2137 static void abort_prepare(BlkActionState *common, Error **errp)
2139 error_setg(errp, "Transaction aborted using Abort action");
2142 static void abort_commit(BlkActionState *common)
2144 g_assert_not_reached(); /* this action never succeeds */
2147 static const BlkActionOps actions[] = {
2148 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2149 .instance_size = sizeof(ExternalSnapshotState),
2150 .prepare = external_snapshot_prepare,
2151 .commit = external_snapshot_commit,
2152 .abort = external_snapshot_abort,
2153 .clean = external_snapshot_clean,
2155 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2156 .instance_size = sizeof(ExternalSnapshotState),
2157 .prepare = external_snapshot_prepare,
2158 .commit = external_snapshot_commit,
2159 .abort = external_snapshot_abort,
2160 .clean = external_snapshot_clean,
2162 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2163 .instance_size = sizeof(DriveBackupState),
2164 .prepare = drive_backup_prepare,
2165 .commit = drive_backup_commit,
2166 .abort = drive_backup_abort,
2167 .clean = drive_backup_clean,
2169 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2170 .instance_size = sizeof(BlockdevBackupState),
2171 .prepare = blockdev_backup_prepare,
2172 .commit = blockdev_backup_commit,
2173 .abort = blockdev_backup_abort,
2174 .clean = blockdev_backup_clean,
2176 [TRANSACTION_ACTION_KIND_ABORT] = {
2177 .instance_size = sizeof(BlkActionState),
2178 .prepare = abort_prepare,
2179 .commit = abort_commit,
2181 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2182 .instance_size = sizeof(InternalSnapshotState),
2183 .prepare = internal_snapshot_prepare,
2184 .abort = internal_snapshot_abort,
2185 .clean = internal_snapshot_clean,
2187 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2188 .instance_size = sizeof(BlockDirtyBitmapState),
2189 .prepare = block_dirty_bitmap_add_prepare,
2190 .abort = block_dirty_bitmap_add_abort,
2192 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2193 .instance_size = sizeof(BlockDirtyBitmapState),
2194 .prepare = block_dirty_bitmap_clear_prepare,
2195 .commit = block_dirty_bitmap_clear_commit,
2196 .abort = block_dirty_bitmap_clear_abort,
2198 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_ENABLE] = {
2199 .instance_size = sizeof(BlockDirtyBitmapState),
2200 .prepare = block_dirty_bitmap_enable_prepare,
2201 .abort = block_dirty_bitmap_enable_abort,
2203 [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_DISABLE] = {
2204 .instance_size = sizeof(BlockDirtyBitmapState),
2205 .prepare = block_dirty_bitmap_disable_prepare,
2206 .abort = block_dirty_bitmap_disable_abort,
2211 * Allocate a TransactionProperties structure if necessary, and fill
2212 * that structure with desired defaults if they are unset.
2214 static TransactionProperties *get_transaction_properties(
2215 TransactionProperties *props)
2218 props = g_new0(TransactionProperties, 1);
2221 if (!props->has_completion_mode) {
2222 props->has_completion_mode = true;
2223 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2230 * 'Atomic' group operations. The operations are performed as a set, and if
2231 * any fail then we roll back all operations in the group.
2233 void qmp_transaction(TransactionActionList *dev_list,
2235 struct TransactionProperties *props,
2238 TransactionActionList *dev_entry = dev_list;
2239 JobTxn *block_job_txn = NULL;
2240 BlkActionState *state, *next;
2241 Error *local_err = NULL;
2243 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2244 QSIMPLEQ_INIT(&snap_bdrv_states);
2246 /* Does this transaction get canceled as a group on failure?
2247 * If not, we don't really need to make a JobTxn.
2249 props = get_transaction_properties(props);
2250 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2251 block_job_txn = job_txn_new();
2254 /* drain all i/o before any operations */
2257 /* We don't do anything in this loop that commits us to the operations */
2258 while (NULL != dev_entry) {
2259 TransactionAction *dev_info = NULL;
2260 const BlkActionOps *ops;
2262 dev_info = dev_entry->value;
2263 dev_entry = dev_entry->next;
2265 assert(dev_info->type < ARRAY_SIZE(actions));
2267 ops = &actions[dev_info->type];
2268 assert(ops->instance_size > 0);
2270 state = g_malloc0(ops->instance_size);
2272 state->action = dev_info;
2273 state->block_job_txn = block_job_txn;
2274 state->txn_props = props;
2275 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2277 state->ops->prepare(state, &local_err);
2279 error_propagate(errp, local_err);
2280 goto delete_and_fail;
2284 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2285 if (state->ops->commit) {
2286 state->ops->commit(state);
2294 /* failure, and it is all-or-none; roll back all operations */
2295 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2296 if (state->ops->abort) {
2297 state->ops->abort(state);
2301 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2302 if (state->ops->clean) {
2303 state->ops->clean(state);
2308 qapi_free_TransactionProperties(props);
2310 job_txn_unref(block_job_txn);
2313 void qmp_eject(bool has_device, const char *device,
2314 bool has_id, const char *id,
2315 bool has_force, bool force, Error **errp)
2317 Error *local_err = NULL;
2324 rc = do_open_tray(has_device ? device : NULL,
2327 if (rc && rc != -ENOSYS) {
2328 error_propagate(errp, local_err);
2331 error_free(local_err);
2333 blockdev_remove_medium(has_device, device, has_id, id, errp);
2336 void qmp_block_passwd(bool has_device, const char *device,
2337 bool has_node_name, const char *node_name,
2338 const char *password, Error **errp)
2341 "Setting block passwords directly is no longer supported");
2345 * Attempt to open the tray of @device.
2346 * If @force, ignore its tray lock.
2347 * Else, if the tray is locked, don't open it, but ask the guest to open it.
2348 * On error, store an error through @errp and return -errno.
2349 * If @device does not exist, return -ENODEV.
2350 * If it has no removable media, return -ENOTSUP.
2351 * If it has no tray, return -ENOSYS.
2352 * If the guest was asked to open the tray, return -EINPROGRESS.
2355 static int do_open_tray(const char *blk_name, const char *qdev_id,
2356 bool force, Error **errp)
2359 const char *device = qdev_id ?: blk_name;
2362 blk = qmp_get_blk(blk_name, qdev_id, errp);
2367 if (!blk_dev_has_removable_media(blk)) {
2368 error_setg(errp, "Device '%s' is not removable", device);
2372 if (!blk_dev_has_tray(blk)) {
2373 error_setg(errp, "Device '%s' does not have a tray", device);
2377 if (blk_dev_is_tray_open(blk)) {
2381 locked = blk_dev_is_medium_locked(blk);
2383 blk_dev_eject_request(blk, force);
2386 if (!locked || force) {
2387 blk_dev_change_media_cb(blk, false, &error_abort);
2390 if (locked && !force) {
2391 error_setg(errp, "Device '%s' is locked and force was not specified, "
2392 "wait for tray to open and try again", device);
2393 return -EINPROGRESS;
2399 void qmp_blockdev_open_tray(bool has_device, const char *device,
2400 bool has_id, const char *id,
2401 bool has_force, bool force,
2404 Error *local_err = NULL;
2410 rc = do_open_tray(has_device ? device : NULL,
2413 if (rc && rc != -ENOSYS && rc != -EINPROGRESS) {
2414 error_propagate(errp, local_err);
2417 error_free(local_err);
2420 void qmp_blockdev_close_tray(bool has_device, const char *device,
2421 bool has_id, const char *id,
2425 Error *local_err = NULL;
2427 device = has_device ? device : NULL;
2428 id = has_id ? id : NULL;
2430 blk = qmp_get_blk(device, id, errp);
2435 if (!blk_dev_has_removable_media(blk)) {
2436 error_setg(errp, "Device '%s' is not removable", device ?: id);
2440 if (!blk_dev_has_tray(blk)) {
2441 /* Ignore this command on tray-less devices */
2445 if (!blk_dev_is_tray_open(blk)) {
2449 blk_dev_change_media_cb(blk, true, &local_err);
2451 error_propagate(errp, local_err);
2456 static void blockdev_remove_medium(bool has_device, const char *device,
2457 bool has_id, const char *id, Error **errp)
2460 BlockDriverState *bs;
2461 AioContext *aio_context;
2462 bool has_attached_device;
2464 device = has_device ? device : NULL;
2465 id = has_id ? id : NULL;
2467 blk = qmp_get_blk(device, id, errp);
2472 /* For BBs without a device, we can exchange the BDS tree at will */
2473 has_attached_device = blk_get_attached_dev(blk);
2475 if (has_attached_device && !blk_dev_has_removable_media(blk)) {
2476 error_setg(errp, "Device '%s' is not removable", device ?: id);
2480 if (has_attached_device && blk_dev_has_tray(blk) &&
2481 !blk_dev_is_tray_open(blk))
2483 error_setg(errp, "Tray of device '%s' is not open", device ?: id);
2492 aio_context = bdrv_get_aio_context(bs);
2493 aio_context_acquire(aio_context);
2495 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2501 if (!blk_dev_has_tray(blk)) {
2502 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2503 * called at all); therefore, the medium needs to be ejected here.
2504 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2505 * value passed here (i.e. false). */
2506 blk_dev_change_media_cb(blk, false, &error_abort);
2510 aio_context_release(aio_context);
2513 void qmp_blockdev_remove_medium(const char *id, Error **errp)
2515 blockdev_remove_medium(false, NULL, true, id, errp);
2518 static void qmp_blockdev_insert_anon_medium(BlockBackend *blk,
2519 BlockDriverState *bs, Error **errp)
2521 Error *local_err = NULL;
2525 /* For BBs without a device, we can exchange the BDS tree at will */
2526 has_device = blk_get_attached_dev(blk);
2528 if (has_device && !blk_dev_has_removable_media(blk)) {
2529 error_setg(errp, "Device is not removable");
2533 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2534 error_setg(errp, "Tray of the device is not open");
2539 error_setg(errp, "There already is a medium in the device");
2543 ret = blk_insert_bs(blk, bs, errp);
2548 if (!blk_dev_has_tray(blk)) {
2549 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2550 * called at all); therefore, the medium needs to be pushed into the
2552 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2553 * value passed here (i.e. true). */
2554 blk_dev_change_media_cb(blk, true, &local_err);
2556 error_propagate(errp, local_err);
2563 static void blockdev_insert_medium(bool has_device, const char *device,
2564 bool has_id, const char *id,
2565 const char *node_name, Error **errp)
2568 BlockDriverState *bs;
2570 blk = qmp_get_blk(has_device ? device : NULL,
2577 bs = bdrv_find_node(node_name);
2579 error_setg(errp, "Node '%s' not found", node_name);
2583 if (bdrv_has_blk(bs)) {
2584 error_setg(errp, "Node '%s' is already in use", node_name);
2588 qmp_blockdev_insert_anon_medium(blk, bs, errp);
2591 void qmp_blockdev_insert_medium(const char *id, const char *node_name,
2594 blockdev_insert_medium(false, NULL, true, id, node_name, errp);
2597 void qmp_blockdev_change_medium(bool has_device, const char *device,
2598 bool has_id, const char *id,
2599 const char *filename,
2600 bool has_format, const char *format,
2602 BlockdevChangeReadOnlyMode read_only,
2606 BlockDriverState *medium_bs = NULL;
2610 QDict *options = NULL;
2613 blk = qmp_get_blk(has_device ? device : NULL,
2621 blk_update_root_state(blk);
2624 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2625 bdrv_flags &= ~(BDRV_O_TEMPORARY | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING |
2628 if (!has_read_only) {
2629 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2632 switch (read_only) {
2633 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2636 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2637 bdrv_flags &= ~BDRV_O_RDWR;
2640 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2641 bdrv_flags |= BDRV_O_RDWR;
2648 options = qdict_new();
2649 detect_zeroes = blk_get_detect_zeroes_from_root_state(blk);
2650 qdict_put_str(options, "detect-zeroes", detect_zeroes ? "on" : "off");
2653 qdict_put_str(options, "driver", format);
2656 medium_bs = bdrv_open(filename, NULL, options, bdrv_flags, errp);
2661 rc = do_open_tray(has_device ? device : NULL,
2664 if (rc && rc != -ENOSYS) {
2665 error_propagate(errp, err);
2671 blockdev_remove_medium(has_device, device, has_id, id, &err);
2673 error_propagate(errp, err);
2677 qmp_blockdev_insert_anon_medium(blk, medium_bs, &err);
2679 error_propagate(errp, err);
2683 qmp_blockdev_close_tray(has_device, device, has_id, id, errp);
2686 /* If the medium has been inserted, the device has its own reference, so
2687 * ours must be relinquished; and if it has not been inserted successfully,
2688 * the reference must be relinquished anyway */
2689 bdrv_unref(medium_bs);
2692 /* throttling disk I/O limits */
2693 void qmp_block_set_io_throttle(BlockIOThrottle *arg, Error **errp)
2696 BlockDriverState *bs;
2698 AioContext *aio_context;
2700 blk = qmp_get_blk(arg->has_device ? arg->device : NULL,
2701 arg->has_id ? arg->id : NULL,
2707 aio_context = blk_get_aio_context(blk);
2708 aio_context_acquire(aio_context);
2712 error_setg(errp, "Device has no medium");
2716 throttle_config_init(&cfg);
2717 cfg.buckets[THROTTLE_BPS_TOTAL].avg = arg->bps;
2718 cfg.buckets[THROTTLE_BPS_READ].avg = arg->bps_rd;
2719 cfg.buckets[THROTTLE_BPS_WRITE].avg = arg->bps_wr;
2721 cfg.buckets[THROTTLE_OPS_TOTAL].avg = arg->iops;
2722 cfg.buckets[THROTTLE_OPS_READ].avg = arg->iops_rd;
2723 cfg.buckets[THROTTLE_OPS_WRITE].avg = arg->iops_wr;
2725 if (arg->has_bps_max) {
2726 cfg.buckets[THROTTLE_BPS_TOTAL].max = arg->bps_max;
2728 if (arg->has_bps_rd_max) {
2729 cfg.buckets[THROTTLE_BPS_READ].max = arg->bps_rd_max;
2731 if (arg->has_bps_wr_max) {
2732 cfg.buckets[THROTTLE_BPS_WRITE].max = arg->bps_wr_max;
2734 if (arg->has_iops_max) {
2735 cfg.buckets[THROTTLE_OPS_TOTAL].max = arg->iops_max;
2737 if (arg->has_iops_rd_max) {
2738 cfg.buckets[THROTTLE_OPS_READ].max = arg->iops_rd_max;
2740 if (arg->has_iops_wr_max) {
2741 cfg.buckets[THROTTLE_OPS_WRITE].max = arg->iops_wr_max;
2744 if (arg->has_bps_max_length) {
2745 cfg.buckets[THROTTLE_BPS_TOTAL].burst_length = arg->bps_max_length;
2747 if (arg->has_bps_rd_max_length) {
2748 cfg.buckets[THROTTLE_BPS_READ].burst_length = arg->bps_rd_max_length;
2750 if (arg->has_bps_wr_max_length) {
2751 cfg.buckets[THROTTLE_BPS_WRITE].burst_length = arg->bps_wr_max_length;
2753 if (arg->has_iops_max_length) {
2754 cfg.buckets[THROTTLE_OPS_TOTAL].burst_length = arg->iops_max_length;
2756 if (arg->has_iops_rd_max_length) {
2757 cfg.buckets[THROTTLE_OPS_READ].burst_length = arg->iops_rd_max_length;
2759 if (arg->has_iops_wr_max_length) {
2760 cfg.buckets[THROTTLE_OPS_WRITE].burst_length = arg->iops_wr_max_length;
2763 if (arg->has_iops_size) {
2764 cfg.op_size = arg->iops_size;
2767 if (!throttle_is_valid(&cfg, errp)) {
2771 if (throttle_enabled(&cfg)) {
2772 /* Enable I/O limits if they're not enabled yet, otherwise
2773 * just update the throttling group. */
2774 if (!blk_get_public(blk)->throttle_group_member.throttle_state) {
2775 blk_io_limits_enable(blk,
2776 arg->has_group ? arg->group :
2777 arg->has_device ? arg->device :
2779 } else if (arg->has_group) {
2780 blk_io_limits_update_group(blk, arg->group);
2782 /* Set the new throttling configuration */
2783 blk_set_io_limits(blk, &cfg);
2784 } else if (blk_get_public(blk)->throttle_group_member.throttle_state) {
2785 /* If all throttling settings are set to 0, disable I/O limits */
2786 blk_io_limits_disable(blk);
2790 aio_context_release(aio_context);
2793 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2794 bool has_granularity, uint32_t granularity,
2795 bool has_persistent, bool persistent,
2796 bool has_autoload, bool autoload,
2797 bool has_disabled, bool disabled,
2800 BlockDriverState *bs;
2801 BdrvDirtyBitmap *bitmap;
2803 if (!name || name[0] == '\0') {
2804 error_setg(errp, "Bitmap name cannot be empty");
2808 bs = bdrv_lookup_bs(node, node, errp);
2813 if (has_granularity) {
2814 if (granularity < 512 || !is_power_of_2(granularity)) {
2815 error_setg(errp, "Granularity must be power of 2 "
2816 "and at least 512");
2820 /* Default to cluster size, if available: */
2821 granularity = bdrv_get_default_bitmap_granularity(bs);
2824 if (!has_persistent) {
2829 warn_report("Autoload option is deprecated and its value is ignored");
2832 if (!has_disabled) {
2837 !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
2842 bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2843 if (bitmap == NULL) {
2848 bdrv_disable_dirty_bitmap(bitmap);
2851 bdrv_dirty_bitmap_set_persistance(bitmap, persistent);
2854 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2857 BlockDriverState *bs;
2858 BdrvDirtyBitmap *bitmap;
2859 Error *local_err = NULL;
2861 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2862 if (!bitmap || !bs) {
2866 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2868 "Bitmap '%s' is currently frozen and cannot be removed",
2871 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
2873 "Bitmap '%s' is currently locked and cannot be removed",
2878 if (bdrv_dirty_bitmap_get_persistance(bitmap)) {
2879 bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err);
2880 if (local_err != NULL) {
2881 error_propagate(errp, local_err);
2886 bdrv_release_dirty_bitmap(bs, bitmap);
2890 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2891 * immediately after a full backup operation.
2893 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2896 BdrvDirtyBitmap *bitmap;
2897 BlockDriverState *bs;
2899 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2900 if (!bitmap || !bs) {
2904 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2906 "Bitmap '%s' is currently frozen and cannot be modified",
2909 } else if (bdrv_dirty_bitmap_qmp_locked(bitmap)) {
2911 "Bitmap '%s' is currently locked and cannot be modified",
2914 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2916 "Bitmap '%s' is currently disabled and cannot be cleared",
2919 } else if (bdrv_dirty_bitmap_readonly(bitmap)) {
2920 error_setg(errp, "Bitmap '%s' is readonly and cannot be cleared", name);
2924 bdrv_clear_dirty_bitmap(bitmap, NULL);
2927 void qmp_x_block_dirty_bitmap_enable(const char *node, const char *name,
2930 BlockDriverState *bs;
2931 BdrvDirtyBitmap *bitmap;
2933 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2938 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2940 "Bitmap '%s' is currently frozen and cannot be enabled",
2945 bdrv_enable_dirty_bitmap(bitmap);
2948 void qmp_x_block_dirty_bitmap_disable(const char *node, const char *name,
2951 BlockDriverState *bs;
2952 BdrvDirtyBitmap *bitmap;
2954 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2959 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2961 "Bitmap '%s' is currently frozen and cannot be disabled",
2966 bdrv_disable_dirty_bitmap(bitmap);
2969 void qmp_x_block_dirty_bitmap_merge(const char *node, const char *dst_name,
2970 const char *src_name, Error **errp)
2972 BlockDriverState *bs;
2973 BdrvDirtyBitmap *dst, *src;
2975 dst = block_dirty_bitmap_lookup(node, dst_name, &bs, errp);
2980 if (bdrv_dirty_bitmap_frozen(dst)) {
2981 error_setg(errp, "Bitmap '%s' is frozen and cannot be modified",
2984 } else if (bdrv_dirty_bitmap_readonly(dst)) {
2985 error_setg(errp, "Bitmap '%s' is readonly and cannot be modified",
2990 src = bdrv_find_dirty_bitmap(bs, src_name);
2992 error_setg(errp, "Dirty bitmap '%s' not found", src_name);
2996 bdrv_merge_dirty_bitmap(dst, src, errp);
2999 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
3003 BdrvDirtyBitmap *bitmap;
3004 BlockDriverState *bs;
3005 BlockDirtyBitmapSha256 *ret = NULL;
3008 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
3009 if (!bitmap || !bs) {
3013 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
3014 if (sha256 == NULL) {
3018 ret = g_new(BlockDirtyBitmapSha256, 1);
3019 ret->sha256 = sha256;
3024 void hmp_drive_del(Monitor *mon, const QDict *qdict)
3026 const char *id = qdict_get_str(qdict, "id");
3028 BlockDriverState *bs;
3029 AioContext *aio_context;
3030 Error *local_err = NULL;
3032 bs = bdrv_find_node(id);
3034 qmp_blockdev_del(id, &local_err);
3036 error_report_err(local_err);
3041 blk = blk_by_name(id);
3043 error_report("Device '%s' not found", id);
3047 if (!blk_legacy_dinfo(blk)) {
3048 error_report("Deleting device added with blockdev-add"
3049 " is not supported");
3053 aio_context = blk_get_aio_context(blk);
3054 aio_context_acquire(aio_context);
3058 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
3059 error_report_err(local_err);
3060 aio_context_release(aio_context);
3067 /* Make the BlockBackend and the attached BlockDriverState anonymous */
3068 monitor_remove_blk(blk);
3070 /* If this BlockBackend has a device attached to it, its refcount will be
3071 * decremented when the device is removed; otherwise we have to do so here.
3073 if (blk_get_attached_dev(blk)) {
3074 /* Further I/O must not pause the guest */
3075 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
3076 BLOCKDEV_ON_ERROR_REPORT);
3081 aio_context_release(aio_context);
3084 void qmp_block_resize(bool has_device, const char *device,
3085 bool has_node_name, const char *node_name,
3086 int64_t size, Error **errp)
3088 Error *local_err = NULL;
3089 BlockBackend *blk = NULL;
3090 BlockDriverState *bs;
3091 AioContext *aio_context;
3094 bs = bdrv_lookup_bs(has_device ? device : NULL,
3095 has_node_name ? node_name : NULL,
3098 error_propagate(errp, local_err);
3102 aio_context = bdrv_get_aio_context(bs);
3103 aio_context_acquire(aio_context);
3105 if (!bdrv_is_first_non_filter(bs)) {
3106 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
3111 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
3115 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
3116 error_setg(errp, QERR_DEVICE_IN_USE, device);
3120 blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL);
3121 ret = blk_insert_bs(blk, bs, errp);
3126 bdrv_drained_begin(bs);
3127 ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp);
3128 bdrv_drained_end(bs);
3132 aio_context_release(aio_context);
3135 void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
3136 bool has_base, const char *base,
3137 bool has_base_node, const char *base_node,
3138 bool has_backing_file, const char *backing_file,
3139 bool has_speed, int64_t speed,
3140 bool has_on_error, BlockdevOnError on_error,
3143 BlockDriverState *bs, *iter;
3144 BlockDriverState *base_bs = NULL;
3145 AioContext *aio_context;
3146 Error *local_err = NULL;
3147 const char *base_name = NULL;
3149 if (!has_on_error) {
3150 on_error = BLOCKDEV_ON_ERROR_REPORT;
3153 bs = bdrv_lookup_bs(device, device, errp);
3158 aio_context = bdrv_get_aio_context(bs);
3159 aio_context_acquire(aio_context);
3161 if (has_base && has_base_node) {
3162 error_setg(errp, "'base' and 'base-node' cannot be specified "
3163 "at the same time");
3168 base_bs = bdrv_find_backing_image(bs, base);
3169 if (base_bs == NULL) {
3170 error_setg(errp, QERR_BASE_NOT_FOUND, base);
3173 assert(bdrv_get_aio_context(base_bs) == aio_context);
3177 if (has_base_node) {
3178 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
3182 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
3183 error_setg(errp, "Node '%s' is not a backing image of '%s'",
3187 assert(bdrv_get_aio_context(base_bs) == aio_context);
3188 base_name = base_bs->filename;
3191 /* Check for op blockers in the whole chain between bs and base */
3192 for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
3193 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
3198 /* if we are streaming the entire chain, the result will have no backing
3199 * file, and specifying one is therefore an error */
3200 if (base_bs == NULL && has_backing_file) {
3201 error_setg(errp, "backing file specified, but streaming the "
3206 /* backing_file string overrides base bs filename */
3207 base_name = has_backing_file ? backing_file : base_name;
3209 stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
3210 has_speed ? speed : 0, on_error, &local_err);
3212 error_propagate(errp, local_err);
3216 trace_qmp_block_stream(bs, bs->job);
3219 aio_context_release(aio_context);
3222 void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
3223 bool has_base, const char *base,
3224 bool has_top, const char *top,
3225 bool has_backing_file, const char *backing_file,
3226 bool has_speed, int64_t speed,
3227 bool has_filter_node_name, const char *filter_node_name,
3230 BlockDriverState *bs;
3231 BlockDriverState *iter;
3232 BlockDriverState *base_bs, *top_bs;
3233 AioContext *aio_context;
3234 Error *local_err = NULL;
3235 /* This will be part of the QMP command, if/when the
3236 * BlockdevOnError change for blkmirror makes it in
3238 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3243 if (!has_filter_node_name) {
3244 filter_node_name = NULL;
3248 * libvirt relies on the DeviceNotFound error class in order to probe for
3249 * live commit feature versions; for this to work, we must make sure to
3250 * perform the device lookup before any generic errors that may occur in a
3251 * scenario in which all optional arguments are omitted. */
3252 bs = qmp_get_root_bs(device, &local_err);
3254 bs = bdrv_lookup_bs(device, device, NULL);
3256 error_free(local_err);
3257 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3258 "Device '%s' not found", device);
3260 error_propagate(errp, local_err);
3265 aio_context = bdrv_get_aio_context(bs);
3266 aio_context_acquire(aio_context);
3268 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3272 /* default top_bs is the active layer */
3275 if (has_top && top) {
3276 if (strcmp(bs->filename, top) != 0) {
3277 top_bs = bdrv_find_backing_image(bs, top);
3281 if (top_bs == NULL) {
3282 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3286 assert(bdrv_get_aio_context(top_bs) == aio_context);
3288 if (has_base && base) {
3289 base_bs = bdrv_find_backing_image(top_bs, base);
3291 base_bs = bdrv_find_base(top_bs);
3294 if (base_bs == NULL) {
3295 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3299 assert(bdrv_get_aio_context(base_bs) == aio_context);
3301 for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) {
3302 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3307 /* Do not allow attempts to commit an image into itself */
3308 if (top_bs == base_bs) {
3309 error_setg(errp, "cannot commit an image into itself");
3314 if (has_backing_file) {
3315 error_setg(errp, "'backing-file' specified,"
3316 " but 'top' is the active layer");
3319 commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
3320 JOB_DEFAULT, speed, on_error,
3321 filter_node_name, NULL, NULL, false, &local_err);
3323 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
3324 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3327 commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed,
3328 on_error, has_backing_file ? backing_file : NULL,
3329 filter_node_name, &local_err);
3331 if (local_err != NULL) {
3332 error_propagate(errp, local_err);
3337 aio_context_release(aio_context);
3340 static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
3343 BlockDriverState *bs;
3344 BlockDriverState *target_bs;
3345 BlockDriverState *source = NULL;
3346 BlockJob *job = NULL;
3347 BdrvDirtyBitmap *bmap = NULL;
3348 AioContext *aio_context;
3349 QDict *options = NULL;
3350 Error *local_err = NULL;
3351 int flags, job_flags = JOB_DEFAULT;
3353 bool set_backing_hd = false;
3355 if (!backup->has_speed) {
3358 if (!backup->has_on_source_error) {
3359 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3361 if (!backup->has_on_target_error) {
3362 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3364 if (!backup->has_mode) {
3365 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3367 if (!backup->has_job_id) {
3368 backup->job_id = NULL;
3370 if (!backup->has_auto_finalize) {
3371 backup->auto_finalize = true;
3373 if (!backup->has_auto_dismiss) {
3374 backup->auto_dismiss = true;
3376 if (!backup->has_compress) {
3377 backup->compress = false;
3380 bs = qmp_get_root_bs(backup->device, errp);
3385 aio_context = bdrv_get_aio_context(bs);
3386 aio_context_acquire(aio_context);
3388 if (!backup->has_format) {
3389 backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ?
3390 NULL : (char*) bs->drv->format_name;
3393 /* Early check to avoid creating target */
3394 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3398 flags = bs->open_flags | BDRV_O_RDWR;
3400 /* See if we have a backing HD we can use to create our new image
3402 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
3403 source = backing_bs(bs);
3405 backup->sync = MIRROR_SYNC_MODE_FULL;
3408 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
3410 flags |= BDRV_O_NO_BACKING;
3411 set_backing_hd = true;
3414 size = bdrv_getlength(bs);
3416 error_setg_errno(errp, -size, "bdrv_getlength failed");
3420 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
3421 assert(backup->format);
3423 bdrv_img_create(backup->target, backup->format, source->filename,
3424 source->drv->format_name, NULL,
3425 size, flags, false, &local_err);
3427 bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,
3428 size, flags, false, &local_err);
3433 error_propagate(errp, local_err);
3437 if (backup->format) {
3439 options = qdict_new();
3441 qdict_put_str(options, "driver", backup->format);
3444 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
3449 bdrv_set_aio_context(target_bs, aio_context);
3451 if (set_backing_hd) {
3452 bdrv_set_backing_hd(target_bs, source, &local_err);
3454 bdrv_unref(target_bs);
3459 if (backup->has_bitmap) {
3460 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
3462 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
3463 bdrv_unref(target_bs);
3466 if (bdrv_dirty_bitmap_qmp_locked(bmap)) {
3468 "Bitmap '%s' is currently locked and cannot be used for "
3469 "backup", backup->bitmap);
3473 if (!backup->auto_finalize) {
3474 job_flags |= JOB_MANUAL_FINALIZE;
3476 if (!backup->auto_dismiss) {
3477 job_flags |= JOB_MANUAL_DISMISS;
3480 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3481 backup->sync, bmap, backup->compress,
3482 backup->on_source_error, backup->on_target_error,
3483 job_flags, NULL, NULL, txn, &local_err);
3484 bdrv_unref(target_bs);
3485 if (local_err != NULL) {
3486 error_propagate(errp, local_err);
3491 aio_context_release(aio_context);
3495 void qmp_drive_backup(DriveBackup *arg, Error **errp)
3499 job = do_drive_backup(arg, NULL, errp);
3501 job_start(&job->job);
3505 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3507 return bdrv_named_nodes_list(errp);
3510 BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
3513 BlockDriverState *bs;
3514 BlockDriverState *target_bs;
3515 Error *local_err = NULL;
3516 AioContext *aio_context;
3517 BlockJob *job = NULL;
3518 int job_flags = JOB_DEFAULT;
3520 if (!backup->has_speed) {
3523 if (!backup->has_on_source_error) {
3524 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3526 if (!backup->has_on_target_error) {
3527 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3529 if (!backup->has_job_id) {
3530 backup->job_id = NULL;
3532 if (!backup->has_auto_finalize) {
3533 backup->auto_finalize = true;
3535 if (!backup->has_auto_dismiss) {
3536 backup->auto_dismiss = true;
3538 if (!backup->has_compress) {
3539 backup->compress = false;
3542 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
3547 aio_context = bdrv_get_aio_context(bs);
3548 aio_context_acquire(aio_context);
3550 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
3555 if (bdrv_get_aio_context(target_bs) != aio_context) {
3556 if (!bdrv_has_blk(target_bs)) {
3557 /* The target BDS is not attached, we can safely move it to another
3559 bdrv_set_aio_context(target_bs, aio_context);
3561 error_setg(errp, "Target is attached to a different thread from "
3566 if (!backup->auto_finalize) {
3567 job_flags |= JOB_MANUAL_FINALIZE;
3569 if (!backup->auto_dismiss) {
3570 job_flags |= JOB_MANUAL_DISMISS;
3572 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
3573 backup->sync, NULL, backup->compress,
3574 backup->on_source_error, backup->on_target_error,
3575 job_flags, NULL, NULL, txn, &local_err);
3576 if (local_err != NULL) {
3577 error_propagate(errp, local_err);
3580 aio_context_release(aio_context);
3584 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
3587 job = do_blockdev_backup(arg, NULL, errp);
3589 job_start(&job->job);
3593 /* Parameter check and block job starting for drive mirroring.
3594 * Caller should hold @device and @target's aio context (must be the same).
3596 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
3597 BlockDriverState *target,
3598 bool has_replaces, const char *replaces,
3599 enum MirrorSyncMode sync,
3600 BlockMirrorBackingMode backing_mode,
3601 bool has_speed, int64_t speed,
3602 bool has_granularity, uint32_t granularity,
3603 bool has_buf_size, int64_t buf_size,
3604 bool has_on_source_error,
3605 BlockdevOnError on_source_error,
3606 bool has_on_target_error,
3607 BlockdevOnError on_target_error,
3608 bool has_unmap, bool unmap,
3609 bool has_filter_node_name,
3610 const char *filter_node_name,
3611 bool has_copy_mode, MirrorCopyMode copy_mode,
3618 if (!has_on_source_error) {
3619 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3621 if (!has_on_target_error) {
3622 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3624 if (!has_granularity) {
3627 if (!has_buf_size) {
3633 if (!has_filter_node_name) {
3634 filter_node_name = NULL;
3636 if (!has_copy_mode) {
3637 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
3640 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3641 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3642 "a value in range [512B, 64MB]");
3645 if (granularity & (granularity - 1)) {
3646 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3651 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3654 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3658 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3659 sync = MIRROR_SYNC_MODE_FULL;
3662 /* pass the node name to replace to mirror start since it's loose coupling
3663 * and will allow to check whether the node still exist at mirror completion
3665 mirror_start(job_id, bs, target,
3666 has_replaces ? replaces : NULL,
3667 speed, granularity, buf_size, sync, backing_mode,
3668 on_source_error, on_target_error, unmap, filter_node_name,
3672 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3674 BlockDriverState *bs;
3675 BlockDriverState *source, *target_bs;
3676 AioContext *aio_context;
3677 BlockMirrorBackingMode backing_mode;
3678 Error *local_err = NULL;
3679 QDict *options = NULL;
3682 const char *format = arg->format;
3684 bs = qmp_get_root_bs(arg->device, errp);
3689 /* Early check to avoid creating target */
3690 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3694 aio_context = bdrv_get_aio_context(bs);
3695 aio_context_acquire(aio_context);
3697 if (!arg->has_mode) {
3698 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3701 if (!arg->has_format) {
3702 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3703 ? NULL : bs->drv->format_name);
3706 flags = bs->open_flags | BDRV_O_RDWR;
3707 source = backing_bs(bs);
3708 if (!source && arg->sync == MIRROR_SYNC_MODE_TOP) {
3709 arg->sync = MIRROR_SYNC_MODE_FULL;
3711 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3715 size = bdrv_getlength(bs);
3717 error_setg_errno(errp, -size, "bdrv_getlength failed");
3721 if (arg->has_replaces) {
3722 BlockDriverState *to_replace_bs;
3723 AioContext *replace_aio_context;
3724 int64_t replace_size;
3726 if (!arg->has_node_name) {
3727 error_setg(errp, "a node-name must be provided when replacing a"
3728 " named node of the graph");
3732 to_replace_bs = check_to_replace_node(bs, arg->replaces, &local_err);
3734 if (!to_replace_bs) {
3735 error_propagate(errp, local_err);
3739 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3740 aio_context_acquire(replace_aio_context);
3741 replace_size = bdrv_getlength(to_replace_bs);
3742 aio_context_release(replace_aio_context);
3744 if (size != replace_size) {
3745 error_setg(errp, "cannot replace image with a mirror image of "
3751 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3752 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3754 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3757 /* Don't open backing image in create() */
3758 flags |= BDRV_O_NO_BACKING;
3760 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !source)
3761 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3763 /* create new image w/o backing file */
3765 bdrv_img_create(arg->target, format,
3766 NULL, NULL, NULL, size, flags, false, &local_err);
3768 switch (arg->mode) {
3769 case NEW_IMAGE_MODE_EXISTING:
3771 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3772 /* create new image with backing file */
3773 bdrv_img_create(arg->target, format,
3775 source->drv->format_name,
3776 NULL, size, flags, false, &local_err);
3784 error_propagate(errp, local_err);
3788 options = qdict_new();
3789 if (arg->has_node_name) {
3790 qdict_put_str(options, "node-name", arg->node_name);
3793 qdict_put_str(options, "driver", format);
3796 /* Mirroring takes care of copy-on-write using the source's backing
3799 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3804 bdrv_set_aio_context(target_bs, aio_context);
3806 blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
3807 arg->has_replaces, arg->replaces, arg->sync,
3808 backing_mode, arg->has_speed, arg->speed,
3809 arg->has_granularity, arg->granularity,
3810 arg->has_buf_size, arg->buf_size,
3811 arg->has_on_source_error, arg->on_source_error,
3812 arg->has_on_target_error, arg->on_target_error,
3813 arg->has_unmap, arg->unmap,
3815 arg->has_copy_mode, arg->copy_mode,
3817 bdrv_unref(target_bs);
3818 error_propagate(errp, local_err);
3820 aio_context_release(aio_context);
3823 void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
3824 const char *device, const char *target,
3825 bool has_replaces, const char *replaces,
3826 MirrorSyncMode sync,
3827 bool has_speed, int64_t speed,
3828 bool has_granularity, uint32_t granularity,
3829 bool has_buf_size, int64_t buf_size,
3830 bool has_on_source_error,
3831 BlockdevOnError on_source_error,
3832 bool has_on_target_error,
3833 BlockdevOnError on_target_error,
3834 bool has_filter_node_name,
3835 const char *filter_node_name,
3836 bool has_copy_mode, MirrorCopyMode copy_mode,
3839 BlockDriverState *bs;
3840 BlockDriverState *target_bs;
3841 AioContext *aio_context;
3842 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3843 Error *local_err = NULL;
3845 bs = qmp_get_root_bs(device, errp);
3850 target_bs = bdrv_lookup_bs(target, target, errp);
3855 aio_context = bdrv_get_aio_context(bs);
3856 aio_context_acquire(aio_context);
3858 bdrv_set_aio_context(target_bs, aio_context);
3860 blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
3861 has_replaces, replaces, sync, backing_mode,
3863 has_granularity, granularity,
3864 has_buf_size, buf_size,
3865 has_on_source_error, on_source_error,
3866 has_on_target_error, on_target_error,
3868 has_filter_node_name, filter_node_name,
3869 has_copy_mode, copy_mode,
3871 error_propagate(errp, local_err);
3873 aio_context_release(aio_context);
3876 /* Get a block job using its ID and acquire its AioContext */
3877 static BlockJob *find_block_job(const char *id, AioContext **aio_context,
3884 *aio_context = NULL;
3886 job = block_job_get(id);
3889 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3890 "Block job '%s' not found", id);
3894 *aio_context = blk_get_aio_context(job->blk);
3895 aio_context_acquire(*aio_context);
3900 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3902 AioContext *aio_context;
3903 BlockJob *job = find_block_job(device, &aio_context, errp);
3909 block_job_set_speed(job, speed, errp);
3910 aio_context_release(aio_context);
3913 void qmp_block_job_cancel(const char *device,
3914 bool has_force, bool force, Error **errp)
3916 AioContext *aio_context;
3917 BlockJob *job = find_block_job(device, &aio_context, errp);
3927 if (job_user_paused(&job->job) && !force) {
3928 error_setg(errp, "The block job for device '%s' is currently paused",
3933 trace_qmp_block_job_cancel(job);
3934 job_user_cancel(&job->job, force, errp);
3936 aio_context_release(aio_context);
3939 void qmp_block_job_pause(const char *device, Error **errp)
3941 AioContext *aio_context;
3942 BlockJob *job = find_block_job(device, &aio_context, errp);
3948 trace_qmp_block_job_pause(job);
3949 job_user_pause(&job->job, errp);
3950 aio_context_release(aio_context);
3953 void qmp_block_job_resume(const char *device, Error **errp)
3955 AioContext *aio_context;
3956 BlockJob *job = find_block_job(device, &aio_context, errp);
3962 trace_qmp_block_job_resume(job);
3963 job_user_resume(&job->job, errp);
3964 aio_context_release(aio_context);
3967 void qmp_block_job_complete(const char *device, Error **errp)
3969 AioContext *aio_context;
3970 BlockJob *job = find_block_job(device, &aio_context, errp);
3976 trace_qmp_block_job_complete(job);
3977 job_complete(&job->job, errp);
3978 aio_context_release(aio_context);
3981 void qmp_block_job_finalize(const char *id, Error **errp)
3983 AioContext *aio_context;
3984 BlockJob *job = find_block_job(id, &aio_context, errp);
3990 trace_qmp_block_job_finalize(job);
3991 job_finalize(&job->job, errp);
3992 aio_context_release(aio_context);
3995 void qmp_block_job_dismiss(const char *id, Error **errp)
3997 AioContext *aio_context;
3998 BlockJob *bjob = find_block_job(id, &aio_context, errp);
4005 trace_qmp_block_job_dismiss(bjob);
4007 job_dismiss(&job, errp);
4008 aio_context_release(aio_context);
4011 void qmp_change_backing_file(const char *device,
4012 const char *image_node_name,
4013 const char *backing_file,
4016 BlockDriverState *bs = NULL;
4017 AioContext *aio_context;
4018 BlockDriverState *image_bs = NULL;
4019 Error *local_err = NULL;
4024 bs = qmp_get_root_bs(device, errp);
4029 aio_context = bdrv_get_aio_context(bs);
4030 aio_context_acquire(aio_context);
4032 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
4034 error_propagate(errp, local_err);
4039 error_setg(errp, "image file not found");
4043 if (bdrv_find_base(image_bs) == image_bs) {
4044 error_setg(errp, "not allowing backing file change on an image "
4045 "without a backing file");
4049 /* even though we are not necessarily operating on bs, we need it to
4050 * determine if block ops are currently prohibited on the chain */
4051 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
4055 /* final sanity check */
4056 if (!bdrv_chain_contains(bs, image_bs)) {
4057 error_setg(errp, "'%s' and image file are not in the same chain",
4062 /* if not r/w, reopen to make r/w */
4063 open_flags = image_bs->open_flags;
4064 ro = bdrv_is_read_only(image_bs);
4067 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
4069 error_propagate(errp, local_err);
4074 ret = bdrv_change_backing_file(image_bs, backing_file,
4075 image_bs->drv ? image_bs->drv->format_name : "");
4078 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
4080 /* don't exit here, so we can try to restore open flags if
4085 bdrv_reopen(image_bs, open_flags, &local_err);
4086 error_propagate(errp, local_err);
4090 aio_context_release(aio_context);
4093 void hmp_drive_add_node(Monitor *mon, const char *optstr)
4097 Error *local_err = NULL;
4099 opts = qemu_opts_parse_noisily(&qemu_drive_opts, optstr, false);
4104 qdict = qemu_opts_to_qdict(opts, NULL);
4106 if (!qdict_get_try_str(qdict, "node-name")) {
4107 qobject_unref(qdict);
4108 error_report("'node-name' needs to be specified");
4112 BlockDriverState *bs = bds_tree_init(qdict, &local_err);
4114 error_report_err(local_err);
4118 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4121 qemu_opts_del(opts);
4124 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
4126 BlockDriverState *bs;
4128 Visitor *v = qobject_output_visitor_new(&obj);
4130 Error *local_err = NULL;
4132 visit_type_BlockdevOptions(v, NULL, &options, &local_err);
4134 error_propagate(errp, local_err);
4138 visit_complete(v, &obj);
4139 qdict = qobject_to(QDict, obj);
4141 qdict_flatten(qdict);
4143 if (!qdict_get_try_str(qdict, "node-name")) {
4144 error_setg(errp, "'node-name' must be specified for the root node");
4148 bs = bds_tree_init(qdict, errp);
4153 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
4159 void qmp_blockdev_del(const char *node_name, Error **errp)
4161 AioContext *aio_context;
4162 BlockDriverState *bs;
4164 bs = bdrv_find_node(node_name);
4166 error_setg(errp, "Cannot find node %s", node_name);
4169 if (bdrv_has_blk(bs)) {
4170 error_setg(errp, "Node %s is in use", node_name);
4173 aio_context = bdrv_get_aio_context(bs);
4174 aio_context_acquire(aio_context);
4176 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
4180 if (!bs->monitor_list.tqe_prev) {
4181 error_setg(errp, "Node %s is not owned by the monitor",
4186 if (bs->refcnt > 1) {
4187 error_setg(errp, "Block device %s is in use",
4188 bdrv_get_device_or_node_name(bs));
4192 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
4196 aio_context_release(aio_context);
4199 static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs,
4200 const char *child_name)
4204 QLIST_FOREACH(child, &parent_bs->children, next) {
4205 if (strcmp(child->name, child_name) == 0) {
4213 void qmp_x_blockdev_change(const char *parent, bool has_child,
4214 const char *child, bool has_node,
4215 const char *node, Error **errp)
4217 BlockDriverState *parent_bs, *new_bs = NULL;
4220 parent_bs = bdrv_lookup_bs(parent, parent, errp);
4225 if (has_child == has_node) {
4227 error_setg(errp, "The parameters child and node are in conflict");
4229 error_setg(errp, "Either child or node must be specified");
4235 p_child = bdrv_find_child(parent_bs, child);
4237 error_setg(errp, "Node '%s' does not have child '%s'",
4241 bdrv_del_child(parent_bs, p_child, errp);
4245 new_bs = bdrv_find_node(node);
4247 error_setg(errp, "Node '%s' not found", node);
4250 bdrv_add_child(parent_bs, new_bs, errp);
4254 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
4256 BlockJobInfoList *head = NULL, **p_next = &head;
4259 for (job = block_job_next(NULL); job; job = block_job_next(job)) {
4260 BlockJobInfoList *elem;
4261 AioContext *aio_context;
4263 if (block_job_is_internal(job)) {
4266 elem = g_new0(BlockJobInfoList, 1);
4267 aio_context = blk_get_aio_context(job->blk);
4268 aio_context_acquire(aio_context);
4269 elem->value = block_job_query(job, errp);
4270 aio_context_release(aio_context);
4273 qapi_free_BlockJobInfoList(head);
4277 p_next = &elem->next;
4283 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
4284 bool has_force, bool force, Error **errp)
4286 AioContext *old_context;
4287 AioContext *new_context;
4288 BlockDriverState *bs;
4290 bs = bdrv_find_node(node_name);
4292 error_setg(errp, "Cannot find node %s", node_name);
4296 /* Protects against accidents. */
4297 if (!(has_force && force) && bdrv_has_blk(bs)) {
4298 error_setg(errp, "Node %s is associated with a BlockBackend and could "
4299 "be in use (use force=true to override this check)",
4304 if (iothread->type == QTYPE_QSTRING) {
4305 IOThread *obj = iothread_by_id(iothread->u.s);
4307 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
4311 new_context = iothread_get_aio_context(obj);
4313 new_context = qemu_get_aio_context();
4316 old_context = bdrv_get_aio_context(bs);
4317 aio_context_acquire(old_context);
4319 bdrv_set_aio_context(bs, new_context);
4321 aio_context_release(old_context);
4324 void qmp_x_block_latency_histogram_set(
4326 bool has_boundaries, uint64List *boundaries,
4327 bool has_boundaries_read, uint64List *boundaries_read,
4328 bool has_boundaries_write, uint64List *boundaries_write,
4329 bool has_boundaries_flush, uint64List *boundaries_flush,
4332 BlockBackend *blk = blk_by_name(device);
4333 BlockAcctStats *stats;
4336 error_setg(errp, "Device '%s' not found", device);
4339 stats = blk_get_stats(blk);
4341 if (!has_boundaries && !has_boundaries_read && !has_boundaries_write &&
4342 !has_boundaries_flush)
4344 block_latency_histograms_clear(stats);
4348 if (has_boundaries || has_boundaries_read) {
4349 block_latency_histogram_set(
4350 stats, BLOCK_ACCT_READ,
4351 has_boundaries_read ? boundaries_read : boundaries);
4354 if (has_boundaries || has_boundaries_write) {
4355 block_latency_histogram_set(
4356 stats, BLOCK_ACCT_WRITE,
4357 has_boundaries_write ? boundaries_write : boundaries);
4360 if (has_boundaries || has_boundaries_flush) {
4361 block_latency_histogram_set(
4362 stats, BLOCK_ACCT_FLUSH,
4363 has_boundaries_flush ? boundaries_flush : boundaries);
4367 QemuOptsList qemu_common_drive_opts = {
4369 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4373 .type = QEMU_OPT_BOOL,
4374 .help = "enable/disable snapshot mode",
4377 .type = QEMU_OPT_STRING,
4378 .help = "host AIO implementation (threads, native)",
4380 .name = BDRV_OPT_CACHE_WB,
4381 .type = QEMU_OPT_BOOL,
4382 .help = "Enable writeback mode",
4385 .type = QEMU_OPT_STRING,
4386 .help = "disk format (raw, qcow2, ...)",
4389 .type = QEMU_OPT_STRING,
4390 .help = "read error action",
4393 .type = QEMU_OPT_STRING,
4394 .help = "write error action",
4396 .name = BDRV_OPT_READ_ONLY,
4397 .type = QEMU_OPT_BOOL,
4398 .help = "open drive file as read-only",
4404 .name = "throttling.group",
4405 .type = QEMU_OPT_STRING,
4406 .help = "name of the block throttling group",
4408 .name = "copy-on-read",
4409 .type = QEMU_OPT_BOOL,
4410 .help = "copy read data from backing file into image file",
4412 .name = "detect-zeroes",
4413 .type = QEMU_OPT_STRING,
4414 .help = "try to optimize zero writes (off, on, unmap)",
4416 .name = "stats-account-invalid",
4417 .type = QEMU_OPT_BOOL,
4418 .help = "whether to account for invalid I/O operations "
4419 "in the statistics",
4421 .name = "stats-account-failed",
4422 .type = QEMU_OPT_BOOL,
4423 .help = "whether to account for failed I/O operations "
4424 "in the statistics",
4426 { /* end of list */ }
4430 QemuOptsList qemu_drive_opts = {
4432 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4435 * no elements => accept any params
4436 * validation will happen later
4438 { /* end of list */ }