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 "sysemu/block-backend.h"
34 #include "sysemu/blockdev.h"
35 #include "hw/block/block.h"
36 #include "block/blockjob.h"
37 #include "block/throttle-groups.h"
38 #include "monitor/monitor.h"
39 #include "qemu/error-report.h"
40 #include "qemu/option.h"
41 #include "qemu/config-file.h"
42 #include "qapi/qmp/types.h"
43 #include "qapi-visit.h"
44 #include "qapi/qmp/qerror.h"
45 #include "qapi/qmp-output-visitor.h"
46 #include "qapi/util.h"
47 #include "sysemu/sysemu.h"
48 #include "block/block_int.h"
49 #include "qmp-commands.h"
51 #include "sysemu/arch_init.h"
53 static QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
54 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
56 static const char *const if_name[IF_COUNT] = {
60 [IF_FLOPPY] = "floppy",
61 [IF_PFLASH] = "pflash",
64 [IF_VIRTIO] = "virtio",
68 static int if_max_devs[IF_COUNT] = {
70 * Do not change these numbers! They govern how drive option
71 * index maps to unit and bus. That mapping is ABI.
73 * All controllers used to imlement if=T drives need to support
74 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
75 * Otherwise, some index values map to "impossible" bus, unit
78 * For instance, if you change [IF_SCSI] to 255, -drive
79 * if=scsi,index=12 no longer means bus=1,unit=5, but
80 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
81 * the drive can't be set up. Regression.
88 * Boards may call this to offer board-by-board overrides
89 * of the default, global values.
91 void override_max_devs(BlockInterfaceType type, int max_devs)
100 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
101 dinfo = blk_legacy_dinfo(blk);
102 if (dinfo->type == type) {
103 fprintf(stderr, "Cannot override units-per-bus property of"
104 " the %s interface, because a drive of that type has"
105 " already been added.\n", if_name[type]);
106 g_assert_not_reached();
110 if_max_devs[type] = max_devs;
114 * We automatically delete the drive when a device using it gets
115 * unplugged. Questionable feature, but we can't just drop it.
116 * Device models call blockdev_mark_auto_del() to schedule the
117 * automatic deletion, and generic qdev code calls blockdev_auto_del()
118 * when deletion is actually safe.
120 void blockdev_mark_auto_del(BlockBackend *blk)
122 DriveInfo *dinfo = blk_legacy_dinfo(blk);
123 BlockDriverState *bs = blk_bs(blk);
124 AioContext *aio_context;
131 aio_context = bdrv_get_aio_context(bs);
132 aio_context_acquire(aio_context);
135 block_job_cancel(bs->job);
138 aio_context_release(aio_context);
144 void blockdev_auto_del(BlockBackend *blk)
146 DriveInfo *dinfo = blk_legacy_dinfo(blk);
148 if (dinfo && dinfo->auto_del) {
154 * Returns the current mapping of how many units per bus
155 * a particular interface can support.
157 * A positive integer indicates n units per bus.
158 * 0 implies the mapping has not been established.
159 * -1 indicates an invalid BlockInterfaceType was given.
161 int drive_get_max_devs(BlockInterfaceType type)
163 if (type >= IF_IDE && type < IF_COUNT) {
164 return if_max_devs[type];
170 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
172 int max_devs = if_max_devs[type];
173 return max_devs ? index / max_devs : 0;
176 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
178 int max_devs = if_max_devs[type];
179 return max_devs ? index % max_devs : index;
182 QemuOpts *drive_def(const char *optstr)
184 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
187 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
192 opts = drive_def(optstr);
196 if (type != IF_DEFAULT) {
197 qemu_opt_set(opts, "if", if_name[type], &error_abort);
200 qemu_opt_set_number(opts, "index", index, &error_abort);
203 qemu_opt_set(opts, "file", file, &error_abort);
207 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
212 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
213 dinfo = blk_legacy_dinfo(blk);
214 if (dinfo && dinfo->type == type
215 && dinfo->bus == bus && dinfo->unit == unit) {
223 bool drive_check_orphaned(void)
229 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
230 dinfo = blk_legacy_dinfo(blk);
231 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
232 /* Unless this is a default drive, this may be an oversight. */
233 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
234 dinfo->type != IF_NONE) {
235 fprintf(stderr, "Warning: Orphaned drive without device: "
236 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
237 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
238 if_name[dinfo->type], dinfo->bus, dinfo->unit);
246 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
248 return drive_get(type,
249 drive_index_to_bus_id(type, index),
250 drive_index_to_unit_id(type, index));
253 int drive_get_max_bus(BlockInterfaceType type)
260 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
261 dinfo = blk_legacy_dinfo(blk);
262 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
263 max_bus = dinfo->bus;
269 /* Get a block device. This should only be used for single-drive devices
270 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
272 DriveInfo *drive_get_next(BlockInterfaceType type)
274 static int next_block_unit[IF_COUNT];
276 return drive_get(type, 0, next_block_unit[type]++);
279 static void bdrv_format_print(void *opaque, const char *name)
281 error_printf(" %s", name);
286 BlockDriverState *bs;
289 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
291 if (!strcmp(buf, "ignore")) {
292 return BLOCKDEV_ON_ERROR_IGNORE;
293 } else if (!is_read && !strcmp(buf, "enospc")) {
294 return BLOCKDEV_ON_ERROR_ENOSPC;
295 } else if (!strcmp(buf, "stop")) {
296 return BLOCKDEV_ON_ERROR_STOP;
297 } else if (!strcmp(buf, "report")) {
298 return BLOCKDEV_ON_ERROR_REPORT;
300 error_setg(errp, "'%s' invalid %s error action",
301 buf, is_read ? "read" : "write");
306 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
309 const QListEntry *entry;
310 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
311 switch (qobject_type(entry->value)) {
313 case QTYPE_QSTRING: {
314 unsigned long long length;
315 const char *str = qstring_get_str(qobject_to_qstring(entry->value));
316 if (parse_uint_full(str, &length, 10) == 0 &&
317 length > 0 && length <= UINT_MAX) {
318 block_acct_add_interval(stats, (unsigned) length);
320 error_setg(errp, "Invalid interval length: %s", str);
327 int64_t length = qint_get_int(qobject_to_qint(entry->value));
328 if (length > 0 && length <= UINT_MAX) {
329 block_acct_add_interval(stats, (unsigned) length);
331 error_setg(errp, "Invalid interval length: %" PRId64, length);
338 error_setg(errp, "The specification of stats-intervals is invalid");
345 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
347 if (throttle_conflicting(cfg)) {
348 error_setg(errp, "bps/iops/max total values and read/write values"
349 " cannot be used at the same time");
353 if (!throttle_is_valid(cfg)) {
354 error_setg(errp, "bps/iops/max values must be within [0, %lld]",
359 if (throttle_max_is_missing_limit(cfg)) {
360 error_setg(errp, "bps_max/iops_max require corresponding"
368 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
370 /* All parameters but @opts are optional and may be set to NULL. */
371 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
372 const char **throttling_group, ThrottleConfig *throttle_cfg,
373 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
376 Error *local_error = NULL;
380 if (!qemu_opt_get_bool(opts, "read-only", false)) {
381 *bdrv_flags |= BDRV_O_RDWR;
383 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
384 *bdrv_flags |= BDRV_O_COPY_ON_READ;
387 if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
388 if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
389 error_setg(errp, "Invalid discard option");
394 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
395 if (!strcmp(aio, "native")) {
396 *bdrv_flags |= BDRV_O_NATIVE_AIO;
397 } else if (!strcmp(aio, "threads")) {
398 /* this is the default */
400 error_setg(errp, "invalid aio option");
406 /* disk I/O throttling */
407 if (throttling_group) {
408 *throttling_group = qemu_opt_get(opts, "throttling.group");
412 memset(throttle_cfg, 0, sizeof(*throttle_cfg));
413 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
414 qemu_opt_get_number(opts, "throttling.bps-total", 0);
415 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
416 qemu_opt_get_number(opts, "throttling.bps-read", 0);
417 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
418 qemu_opt_get_number(opts, "throttling.bps-write", 0);
419 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
420 qemu_opt_get_number(opts, "throttling.iops-total", 0);
421 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
422 qemu_opt_get_number(opts, "throttling.iops-read", 0);
423 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
424 qemu_opt_get_number(opts, "throttling.iops-write", 0);
426 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
427 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
428 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
429 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
430 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
431 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
432 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
433 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
434 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
435 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
436 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
437 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
439 throttle_cfg->op_size =
440 qemu_opt_get_number(opts, "throttling.iops-size", 0);
442 if (!check_throttle_config(throttle_cfg, errp)) {
449 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
450 qemu_opt_get(opts, "detect-zeroes"),
451 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
452 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
455 error_propagate(errp, local_error);
460 *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
461 !(*bdrv_flags & BDRV_O_UNMAP))
463 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
464 "without setting discard operation to unmap");
470 /* Takes the ownership of bs_opts */
471 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
476 int on_read_error, on_write_error;
477 bool account_invalid, account_failed;
479 BlockDriverState *bs;
484 QDict *interval_dict = NULL;
485 QList *interval_list = NULL;
487 BlockdevDetectZeroesOptions detect_zeroes =
488 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
489 const char *throttling_group = NULL;
491 /* Check common options by copying from bs_opts to opts, all other options
492 * stay in bs_opts for processing by bdrv_open(). */
493 id = qdict_get_try_str(bs_opts, "id");
494 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
496 error_propagate(errp, error);
500 qemu_opts_absorb_qdict(opts, bs_opts, &error);
502 error_propagate(errp, error);
507 qdict_del(bs_opts, "id");
510 /* extract parameters */
511 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
513 account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
514 account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
516 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
517 qdict_array_split(interval_dict, &interval_list);
519 if (qdict_size(interval_dict) != 0) {
520 error_setg(errp, "Invalid option stats-intervals.%s",
521 qdict_first(interval_dict)->key);
525 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
526 &detect_zeroes, &error);
528 error_propagate(errp, error);
532 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
533 if (is_help_option(buf)) {
534 error_printf("Supported formats:");
535 bdrv_iterate_format(bdrv_format_print, NULL);
540 if (qdict_haskey(bs_opts, "driver")) {
541 error_setg(errp, "Cannot specify both 'driver' and 'format'");
544 qdict_put(bs_opts, "driver", qstring_from_str(buf));
547 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
548 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
549 on_write_error = parse_block_error_action(buf, 0, &error);
551 error_propagate(errp, error);
556 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
557 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
558 on_read_error = parse_block_error_action(buf, 1, &error);
560 error_propagate(errp, error);
566 bdrv_flags |= BDRV_O_SNAPSHOT;
570 if ((!file || !*file) && !qdict_size(bs_opts)) {
571 BlockBackendRootState *blk_rs;
573 blk = blk_new(qemu_opts_id(opts), errp);
578 blk_rs = blk_get_root_state(blk);
579 blk_rs->open_flags = bdrv_flags;
580 blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR);
581 blk_rs->detect_zeroes = detect_zeroes;
583 if (throttle_enabled(&cfg)) {
584 if (!throttling_group) {
585 throttling_group = blk_name(blk);
587 blk_rs->throttle_group = g_strdup(throttling_group);
588 blk_rs->throttle_state = throttle_group_incref(throttling_group);
589 blk_rs->throttle_state->cfg = cfg;
594 if (file && !*file) {
598 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
599 * with other callers) rather than what we want as the real defaults.
600 * Apply the defaults here instead. */
601 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
602 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
603 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
606 /* always use cache=unsafe with snapshot */
607 qdict_put(bs_opts, BDRV_OPT_CACHE_WB, qstring_from_str("on"));
608 qdict_put(bs_opts, BDRV_OPT_CACHE_DIRECT, qstring_from_str("off"));
609 qdict_put(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, qstring_from_str("on"));
612 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
619 bs->detect_zeroes = detect_zeroes;
621 /* disk I/O throttling */
622 if (throttle_enabled(&cfg)) {
623 if (!throttling_group) {
624 throttling_group = blk_name(blk);
626 bdrv_io_limits_enable(bs, throttling_group);
627 bdrv_set_io_limits(bs, &cfg);
630 if (bdrv_key_required(bs)) {
634 block_acct_init(blk_get_stats(blk), account_invalid, account_failed);
636 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
643 blk_set_on_error(blk, on_read_error, on_write_error);
647 QDECREF(interval_dict);
648 QDECREF(interval_list);
653 QDECREF(interval_dict);
654 QDECREF(interval_list);
660 static QemuOptsList qemu_root_bds_opts;
662 /* Takes the ownership of bs_opts */
663 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
665 BlockDriverState *bs;
667 Error *local_error = NULL;
668 BlockdevDetectZeroesOptions detect_zeroes;
672 opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp);
677 qemu_opts_absorb_qdict(opts, bs_opts, &local_error);
679 error_propagate(errp, local_error);
683 extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL,
684 &detect_zeroes, &local_error);
686 error_propagate(errp, local_error);
691 ret = bdrv_open(&bs, NULL, NULL, bs_opts, bdrv_flags, errp);
693 goto fail_no_bs_opts;
696 bs->detect_zeroes = detect_zeroes;
708 void blockdev_close_all_bdrv_states(void)
710 BlockDriverState *bs, *next_bs;
712 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
713 AioContext *ctx = bdrv_get_aio_context(bs);
715 aio_context_acquire(ctx);
717 aio_context_release(ctx);
721 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
726 value = qemu_opt_get(opts, from);
728 if (qemu_opt_find(opts, to)) {
729 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
730 "same time", to, from);
735 /* rename all items in opts */
736 while ((value = qemu_opt_get(opts, from))) {
737 qemu_opt_set(opts, to, value, &error_abort);
738 qemu_opt_unset(opts, from);
742 QemuOptsList qemu_legacy_drive_opts = {
744 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
748 .type = QEMU_OPT_NUMBER,
749 .help = "bus number",
752 .type = QEMU_OPT_NUMBER,
753 .help = "unit number (i.e. lun for scsi)",
756 .type = QEMU_OPT_NUMBER,
757 .help = "index number",
760 .type = QEMU_OPT_STRING,
761 .help = "media type (disk, cdrom)",
764 .type = QEMU_OPT_STRING,
765 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
768 .type = QEMU_OPT_NUMBER,
769 .help = "number of cylinders (ide disk geometry)",
772 .type = QEMU_OPT_NUMBER,
773 .help = "number of heads (ide disk geometry)",
776 .type = QEMU_OPT_NUMBER,
777 .help = "number of sectors (ide disk geometry)",
780 .type = QEMU_OPT_STRING,
781 .help = "chs translation (auto, lba, none)",
784 .type = QEMU_OPT_BOOL,
785 .help = "(deprecated, ignored)",
788 .type = QEMU_OPT_STRING,
789 .help = "pci address (virtio only)",
792 .type = QEMU_OPT_STRING,
793 .help = "disk serial number",
796 .type = QEMU_OPT_STRING,
800 /* Options that are passed on, but have special semantics with -drive */
803 .type = QEMU_OPT_BOOL,
804 .help = "open drive file as read-only",
807 .type = QEMU_OPT_STRING,
808 .help = "read error action",
811 .type = QEMU_OPT_STRING,
812 .help = "write error action",
814 .name = "copy-on-read",
815 .type = QEMU_OPT_BOOL,
816 .help = "copy read data from backing file into image file",
819 { /* end of list */ }
823 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
827 DriveInfo *dinfo = NULL;
829 QemuOpts *legacy_opts;
830 DriveMediaType media = MEDIA_DISK;
831 BlockInterfaceType type;
832 int cyls, heads, secs, translation;
833 int max_devs, bus_id, unit_id, index;
835 const char *werror, *rerror;
836 bool read_only = false;
839 const char *filename;
840 Error *local_err = NULL;
843 /* Change legacy command line options into QMP ones */
844 static const struct {
848 { "iops", "throttling.iops-total" },
849 { "iops_rd", "throttling.iops-read" },
850 { "iops_wr", "throttling.iops-write" },
852 { "bps", "throttling.bps-total" },
853 { "bps_rd", "throttling.bps-read" },
854 { "bps_wr", "throttling.bps-write" },
856 { "iops_max", "throttling.iops-total-max" },
857 { "iops_rd_max", "throttling.iops-read-max" },
858 { "iops_wr_max", "throttling.iops-write-max" },
860 { "bps_max", "throttling.bps-total-max" },
861 { "bps_rd_max", "throttling.bps-read-max" },
862 { "bps_wr_max", "throttling.bps-write-max" },
864 { "iops_size", "throttling.iops-size" },
866 { "group", "throttling.group" },
868 { "readonly", "read-only" },
871 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
872 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
875 error_report_err(local_err);
880 value = qemu_opt_get(all_opts, "cache");
884 if (bdrv_parse_cache_flags(value, &flags) != 0) {
885 error_report("invalid cache option");
889 /* Specific options take precedence */
890 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
891 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
892 !!(flags & BDRV_O_CACHE_WB), &error_abort);
894 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
895 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
896 !!(flags & BDRV_O_NOCACHE), &error_abort);
898 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
899 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
900 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
902 qemu_opt_unset(all_opts, "cache");
905 /* Get a QDict for processing the options */
906 bs_opts = qdict_new();
907 qemu_opts_to_qdict(all_opts, bs_opts);
909 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
911 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
913 error_report_err(local_err);
917 /* Deprecated option boot=[on|off] */
918 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
919 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
920 "ignored. Future versions will reject this parameter. Please "
921 "update your scripts.\n");
925 value = qemu_opt_get(legacy_opts, "media");
927 if (!strcmp(value, "disk")) {
929 } else if (!strcmp(value, "cdrom")) {
933 error_report("'%s' invalid media", value);
938 /* copy-on-read is disabled with a warning for read-only devices */
939 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
940 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
942 if (read_only && copy_on_read) {
943 error_report("warning: disabling copy-on-read on read-only drive");
944 copy_on_read = false;
947 qdict_put(bs_opts, "read-only",
948 qstring_from_str(read_only ? "on" : "off"));
949 qdict_put(bs_opts, "copy-on-read",
950 qstring_from_str(copy_on_read ? "on" :"off"));
952 /* Controller type */
953 value = qemu_opt_get(legacy_opts, "if");
956 type < IF_COUNT && strcmp(value, if_name[type]);
959 if (type == IF_COUNT) {
960 error_report("unsupported bus type '%s'", value);
964 type = block_default_type;
968 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
969 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
970 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
972 if (cyls || heads || secs) {
974 error_report("invalid physical cyls number");
978 error_report("invalid physical heads number");
982 error_report("invalid physical secs number");
987 translation = BIOS_ATA_TRANSLATION_AUTO;
988 value = qemu_opt_get(legacy_opts, "trans");
991 error_report("'%s' trans must be used with cyls, heads and secs",
995 if (!strcmp(value, "none")) {
996 translation = BIOS_ATA_TRANSLATION_NONE;
997 } else if (!strcmp(value, "lba")) {
998 translation = BIOS_ATA_TRANSLATION_LBA;
999 } else if (!strcmp(value, "large")) {
1000 translation = BIOS_ATA_TRANSLATION_LARGE;
1001 } else if (!strcmp(value, "rechs")) {
1002 translation = BIOS_ATA_TRANSLATION_RECHS;
1003 } else if (!strcmp(value, "auto")) {
1004 translation = BIOS_ATA_TRANSLATION_AUTO;
1006 error_report("'%s' invalid translation type", value);
1011 if (media == MEDIA_CDROM) {
1012 if (cyls || secs || heads) {
1013 error_report("CHS can't be set with media=cdrom");
1018 /* Device address specified by bus/unit or index.
1019 * If none was specified, try to find the first free one. */
1020 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
1021 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
1022 index = qemu_opt_get_number(legacy_opts, "index", -1);
1024 max_devs = if_max_devs[type];
1027 if (bus_id != 0 || unit_id != -1) {
1028 error_report("index cannot be used with bus and unit");
1031 bus_id = drive_index_to_bus_id(type, index);
1032 unit_id = drive_index_to_unit_id(type, index);
1035 if (unit_id == -1) {
1037 while (drive_get(type, bus_id, unit_id) != NULL) {
1039 if (max_devs && unit_id >= max_devs) {
1040 unit_id -= max_devs;
1046 if (max_devs && unit_id >= max_devs) {
1047 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
1051 if (drive_get(type, bus_id, unit_id) != NULL) {
1052 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1053 bus_id, unit_id, index);
1058 serial = qemu_opt_get(legacy_opts, "serial");
1060 /* no id supplied -> create one */
1061 if (qemu_opts_id(all_opts) == NULL) {
1063 const char *mediastr = "";
1064 if (type == IF_IDE || type == IF_SCSI) {
1065 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1068 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1071 new_id = g_strdup_printf("%s%s%i", if_name[type],
1074 qdict_put(bs_opts, "id", qstring_from_str(new_id));
1078 /* Add virtio block device */
1079 devaddr = qemu_opt_get(legacy_opts, "addr");
1080 if (devaddr && type != IF_VIRTIO) {
1081 error_report("addr is not supported by this bus type");
1085 if (type == IF_VIRTIO) {
1087 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1089 if (arch_type == QEMU_ARCH_S390X) {
1090 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1092 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1094 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1097 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1101 filename = qemu_opt_get(legacy_opts, "file");
1103 /* Check werror/rerror compatibility with if=... */
1104 werror = qemu_opt_get(legacy_opts, "werror");
1105 if (werror != NULL) {
1106 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1108 error_report("werror is not supported by this bus type");
1111 qdict_put(bs_opts, "werror", qstring_from_str(werror));
1114 rerror = qemu_opt_get(legacy_opts, "rerror");
1115 if (rerror != NULL) {
1116 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1118 error_report("rerror is not supported by this bus type");
1121 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
1124 /* Actual block device init: Functionality shared with blockdev-add */
1125 blk = blockdev_init(filename, bs_opts, &local_err);
1129 error_report_err(local_err);
1136 /* Create legacy DriveInfo */
1137 dinfo = g_malloc0(sizeof(*dinfo));
1138 dinfo->opts = all_opts;
1141 dinfo->heads = heads;
1143 dinfo->trans = translation;
1146 dinfo->bus = bus_id;
1147 dinfo->unit = unit_id;
1148 dinfo->devaddr = devaddr;
1149 dinfo->serial = g_strdup(serial);
1151 blk_set_legacy_dinfo(blk, dinfo);
1158 dinfo->media_cd = media == MEDIA_CDROM;
1165 qemu_opts_del(legacy_opts);
1170 void hmp_commit(Monitor *mon, const QDict *qdict)
1172 const char *device = qdict_get_str(qdict, "device");
1176 if (!strcmp(device, "all")) {
1177 ret = bdrv_commit_all();
1179 BlockDriverState *bs;
1180 AioContext *aio_context;
1182 blk = blk_by_name(device);
1184 monitor_printf(mon, "Device '%s' not found\n", device);
1187 if (!blk_is_available(blk)) {
1188 monitor_printf(mon, "Device '%s' has no medium\n", device);
1193 aio_context = bdrv_get_aio_context(bs);
1194 aio_context_acquire(aio_context);
1196 ret = bdrv_commit(bs);
1198 aio_context_release(aio_context);
1201 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1206 static void blockdev_do_action(TransactionActionKind type, void *data,
1209 TransactionAction action;
1210 TransactionActionList list;
1213 action.u.data = data;
1214 list.value = &action;
1216 qmp_transaction(&list, false, NULL, errp);
1219 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1220 bool has_node_name, const char *node_name,
1221 const char *snapshot_file,
1222 bool has_snapshot_node_name,
1223 const char *snapshot_node_name,
1224 bool has_format, const char *format,
1225 bool has_mode, NewImageMode mode, Error **errp)
1227 BlockdevSnapshotSync snapshot = {
1228 .has_device = has_device,
1229 .device = (char *) device,
1230 .has_node_name = has_node_name,
1231 .node_name = (char *) node_name,
1232 .snapshot_file = (char *) snapshot_file,
1233 .has_snapshot_node_name = has_snapshot_node_name,
1234 .snapshot_node_name = (char *) snapshot_node_name,
1235 .has_format = has_format,
1236 .format = (char *) format,
1237 .has_mode = has_mode,
1240 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1244 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1247 BlockdevSnapshot snapshot_data = {
1248 .node = (char *) node,
1249 .overlay = (char *) overlay
1252 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1253 &snapshot_data, errp);
1256 void qmp_blockdev_snapshot_internal_sync(const char *device,
1260 BlockdevSnapshotInternal snapshot = {
1261 .device = (char *) device,
1262 .name = (char *) name
1265 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1269 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1276 BlockDriverState *bs;
1278 AioContext *aio_context;
1279 QEMUSnapshotInfo sn;
1280 Error *local_err = NULL;
1281 SnapshotInfo *info = NULL;
1284 blk = blk_by_name(device);
1286 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1287 "Device '%s' not found", device);
1291 aio_context = blk_get_aio_context(blk);
1292 aio_context_acquire(aio_context);
1303 error_setg(errp, "Name or id must be provided");
1304 goto out_aio_context;
1307 if (!blk_is_available(blk)) {
1308 error_setg(errp, "Device '%s' has no medium", device);
1309 goto out_aio_context;
1313 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1314 goto out_aio_context;
1317 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1319 error_propagate(errp, local_err);
1320 goto out_aio_context;
1324 "Snapshot with id '%s' and name '%s' does not exist on "
1326 STR_OR_NULL(id), STR_OR_NULL(name), device);
1327 goto out_aio_context;
1330 bdrv_snapshot_delete(bs, id, name, &local_err);
1332 error_propagate(errp, local_err);
1333 goto out_aio_context;
1336 aio_context_release(aio_context);
1338 info = g_new0(SnapshotInfo, 1);
1339 info->id = g_strdup(sn.id_str);
1340 info->name = g_strdup(sn.name);
1341 info->date_nsec = sn.date_nsec;
1342 info->date_sec = sn.date_sec;
1343 info->vm_state_size = sn.vm_state_size;
1344 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1345 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1350 aio_context_release(aio_context);
1355 * block_dirty_bitmap_lookup:
1356 * Return a dirty bitmap (if present), after validating
1357 * the node reference and bitmap names.
1359 * @node: The name of the BDS node to search for bitmaps
1360 * @name: The name of the bitmap to search for
1361 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1362 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1363 * @errp: Output pointer for error information. Can be NULL.
1365 * @return: A bitmap object on success, or NULL on failure.
1367 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1369 BlockDriverState **pbs,
1373 BlockDriverState *bs;
1374 BdrvDirtyBitmap *bitmap;
1375 AioContext *aio_context;
1378 error_setg(errp, "Node cannot be NULL");
1382 error_setg(errp, "Bitmap name cannot be NULL");
1385 bs = bdrv_lookup_bs(node, node, NULL);
1387 error_setg(errp, "Node '%s' not found", node);
1391 aio_context = bdrv_get_aio_context(bs);
1392 aio_context_acquire(aio_context);
1394 bitmap = bdrv_find_dirty_bitmap(bs, name);
1396 error_setg(errp, "Dirty bitmap '%s' not found", name);
1404 *paio = aio_context;
1406 aio_context_release(aio_context);
1412 aio_context_release(aio_context);
1416 /* New and old BlockDriverState structs for atomic group operations */
1418 typedef struct BlkActionState BlkActionState;
1422 * Table of operations that define an Action.
1424 * @instance_size: Size of state struct, in bytes.
1425 * @prepare: Prepare the work, must NOT be NULL.
1426 * @commit: Commit the changes, can be NULL.
1427 * @abort: Abort the changes on fail, can be NULL.
1428 * @clean: Clean up resources after all transaction actions have called
1429 * commit() or abort(). Can be NULL.
1431 * Only prepare() may fail. In a single transaction, only one of commit() or
1432 * abort() will be called. clean() will always be called if it is present.
1434 typedef struct BlkActionOps {
1435 size_t instance_size;
1436 void (*prepare)(BlkActionState *common, Error **errp);
1437 void (*commit)(BlkActionState *common);
1438 void (*abort)(BlkActionState *common);
1439 void (*clean)(BlkActionState *common);
1444 * Describes one Action's state within a Transaction.
1446 * @action: QAPI-defined enum identifying which Action to perform.
1447 * @ops: Table of ActionOps this Action can perform.
1448 * @block_job_txn: Transaction which this action belongs to.
1449 * @entry: List membership for all Actions in this Transaction.
1451 * This structure must be arranged as first member in a subclassed type,
1452 * assuming that the compiler will also arrange it to the same offsets as the
1455 struct BlkActionState {
1456 TransactionAction *action;
1457 const BlkActionOps *ops;
1458 BlockJobTxn *block_job_txn;
1459 TransactionProperties *txn_props;
1460 QSIMPLEQ_ENTRY(BlkActionState) entry;
1463 /* internal snapshot private data */
1464 typedef struct InternalSnapshotState {
1465 BlkActionState common;
1466 BlockDriverState *bs;
1467 AioContext *aio_context;
1468 QEMUSnapshotInfo sn;
1470 } InternalSnapshotState;
1473 static int action_check_completion_mode(BlkActionState *s, Error **errp)
1475 if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
1477 "Action '%s' does not support Transaction property "
1478 "completion-mode = %s",
1479 TransactionActionKind_lookup[s->action->type],
1480 ActionCompletionMode_lookup[s->txn_props->completion_mode]);
1486 static void internal_snapshot_prepare(BlkActionState *common,
1489 Error *local_err = NULL;
1493 BlockDriverState *bs;
1494 QEMUSnapshotInfo old_sn, *sn;
1497 BlockdevSnapshotInternal *internal;
1498 InternalSnapshotState *state;
1501 g_assert(common->action->type ==
1502 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1503 internal = common->action->u.blockdev_snapshot_internal_sync;
1504 state = DO_UPCAST(InternalSnapshotState, common, common);
1506 /* 1. parse input */
1507 device = internal->device;
1508 name = internal->name;
1510 /* 2. check for validation */
1511 if (action_check_completion_mode(common, errp) < 0) {
1515 blk = blk_by_name(device);
1517 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1518 "Device '%s' not found", device);
1522 /* AioContext is released in .clean() */
1523 state->aio_context = blk_get_aio_context(blk);
1524 aio_context_acquire(state->aio_context);
1526 if (!blk_is_available(blk)) {
1527 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1533 bdrv_drained_begin(bs);
1535 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1539 if (bdrv_is_read_only(bs)) {
1540 error_setg(errp, "Device '%s' is read only", device);
1544 if (!bdrv_can_snapshot(bs)) {
1545 error_setg(errp, "Block format '%s' used by device '%s' "
1546 "does not support internal snapshots",
1547 bs->drv->format_name, device);
1551 if (!strlen(name)) {
1552 error_setg(errp, "Name is empty");
1556 /* check whether a snapshot with name exist */
1557 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1560 error_propagate(errp, local_err);
1564 "Snapshot with name '%s' already exists on device '%s'",
1569 /* 3. take the snapshot */
1571 pstrcpy(sn->name, sizeof(sn->name), name);
1572 qemu_gettimeofday(&tv);
1573 sn->date_sec = tv.tv_sec;
1574 sn->date_nsec = tv.tv_usec * 1000;
1575 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1577 ret1 = bdrv_snapshot_create(bs, sn);
1579 error_setg_errno(errp, -ret1,
1580 "Failed to create snapshot '%s' on device '%s'",
1585 /* 4. succeed, mark a snapshot is created */
1586 state->created = true;
1589 static void internal_snapshot_abort(BlkActionState *common)
1591 InternalSnapshotState *state =
1592 DO_UPCAST(InternalSnapshotState, common, common);
1593 BlockDriverState *bs = state->bs;
1594 QEMUSnapshotInfo *sn = &state->sn;
1595 Error *local_error = NULL;
1597 if (!state->created) {
1601 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1602 error_reportf_err(local_error,
1603 "Failed to delete snapshot with id '%s' and "
1604 "name '%s' on device '%s' in abort: ",
1605 sn->id_str, sn->name,
1606 bdrv_get_device_name(bs));
1610 static void internal_snapshot_clean(BlkActionState *common)
1612 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1615 if (state->aio_context) {
1617 bdrv_drained_end(state->bs);
1619 aio_context_release(state->aio_context);
1623 /* external snapshot private data */
1624 typedef struct ExternalSnapshotState {
1625 BlkActionState common;
1626 BlockDriverState *old_bs;
1627 BlockDriverState *new_bs;
1628 AioContext *aio_context;
1629 } ExternalSnapshotState;
1631 static void external_snapshot_prepare(BlkActionState *common,
1635 QDict *options = NULL;
1636 Error *local_err = NULL;
1637 /* Device and node name of the image to generate the snapshot from */
1639 const char *node_name;
1640 /* Reference to the new image (for 'blockdev-snapshot') */
1641 const char *snapshot_ref;
1642 /* File name of the new image (for 'blockdev-snapshot-sync') */
1643 const char *new_image_file;
1644 ExternalSnapshotState *state =
1645 DO_UPCAST(ExternalSnapshotState, common, common);
1646 TransactionAction *action = common->action;
1648 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1649 * purpose but a different set of parameters */
1650 switch (action->type) {
1651 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1653 BlockdevSnapshot *s = action->u.blockdev_snapshot;
1655 node_name = s->node;
1656 new_image_file = NULL;
1657 snapshot_ref = s->overlay;
1660 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1662 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1663 device = s->has_device ? s->device : NULL;
1664 node_name = s->has_node_name ? s->node_name : NULL;
1665 new_image_file = s->snapshot_file;
1666 snapshot_ref = NULL;
1670 g_assert_not_reached();
1673 /* start processing */
1674 if (action_check_completion_mode(common, errp) < 0) {
1678 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1679 if (!state->old_bs) {
1683 /* Acquire AioContext now so any threads operating on old_bs stop */
1684 state->aio_context = bdrv_get_aio_context(state->old_bs);
1685 aio_context_acquire(state->aio_context);
1686 bdrv_drained_begin(state->old_bs);
1688 if (!bdrv_is_inserted(state->old_bs)) {
1689 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1693 if (bdrv_op_is_blocked(state->old_bs,
1694 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1698 if (!bdrv_is_read_only(state->old_bs)) {
1699 if (bdrv_flush(state->old_bs)) {
1700 error_setg(errp, QERR_IO_ERROR);
1705 if (!bdrv_is_first_non_filter(state->old_bs)) {
1706 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1710 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1711 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
1712 const char *format = s->has_format ? s->format : "qcow2";
1713 enum NewImageMode mode;
1714 const char *snapshot_node_name =
1715 s->has_snapshot_node_name ? s->snapshot_node_name : NULL;
1717 if (node_name && !snapshot_node_name) {
1718 error_setg(errp, "New snapshot node name missing");
1722 if (snapshot_node_name &&
1723 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1724 error_setg(errp, "New snapshot node name already in use");
1728 flags = state->old_bs->open_flags;
1730 /* create new image w/backing file */
1731 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1732 if (mode != NEW_IMAGE_MODE_EXISTING) {
1733 bdrv_img_create(new_image_file, format,
1734 state->old_bs->filename,
1735 state->old_bs->drv->format_name,
1736 NULL, -1, flags, &local_err, false);
1738 error_propagate(errp, local_err);
1743 options = qdict_new();
1744 if (s->has_snapshot_node_name) {
1745 qdict_put(options, "node-name",
1746 qstring_from_str(snapshot_node_name));
1748 qdict_put(options, "driver", qstring_from_str(format));
1750 flags |= BDRV_O_NO_BACKING;
1753 assert(state->new_bs == NULL);
1754 ret = bdrv_open(&state->new_bs, new_image_file, snapshot_ref, options,
1756 /* We will manually add the backing_hd field to the bs later */
1761 if (state->new_bs->blk != NULL) {
1762 error_setg(errp, "The snapshot is already in use by %s",
1763 blk_name(state->new_bs->blk));
1767 if (bdrv_op_is_blocked(state->new_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
1772 if (state->new_bs->backing != NULL) {
1773 error_setg(errp, "The snapshot already has a backing image");
1777 if (!state->new_bs->drv->supports_backing) {
1778 error_setg(errp, "The snapshot does not support backing images");
1782 static void external_snapshot_commit(BlkActionState *common)
1784 ExternalSnapshotState *state =
1785 DO_UPCAST(ExternalSnapshotState, common, common);
1787 bdrv_set_aio_context(state->new_bs, state->aio_context);
1789 /* This removes our old bs and adds the new bs */
1790 bdrv_append(state->new_bs, state->old_bs);
1791 /* We don't need (or want) to use the transactional
1792 * bdrv_reopen_multiple() across all the entries at once, because we
1793 * don't want to abort all of them if one of them fails the reopen */
1794 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1798 static void external_snapshot_abort(BlkActionState *common)
1800 ExternalSnapshotState *state =
1801 DO_UPCAST(ExternalSnapshotState, common, common);
1802 if (state->new_bs) {
1803 bdrv_unref(state->new_bs);
1807 static void external_snapshot_clean(BlkActionState *common)
1809 ExternalSnapshotState *state =
1810 DO_UPCAST(ExternalSnapshotState, common, common);
1811 if (state->aio_context) {
1812 bdrv_drained_end(state->old_bs);
1813 aio_context_release(state->aio_context);
1817 typedef struct DriveBackupState {
1818 BlkActionState common;
1819 BlockDriverState *bs;
1820 AioContext *aio_context;
1824 static void do_drive_backup(const char *device, const char *target,
1825 bool has_format, const char *format,
1826 enum MirrorSyncMode sync,
1827 bool has_mode, enum NewImageMode mode,
1828 bool has_speed, int64_t speed,
1829 bool has_bitmap, const char *bitmap,
1830 bool has_on_source_error,
1831 BlockdevOnError on_source_error,
1832 bool has_on_target_error,
1833 BlockdevOnError on_target_error,
1834 BlockJobTxn *txn, Error **errp);
1836 static void drive_backup_prepare(BlkActionState *common, Error **errp)
1838 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1840 DriveBackup *backup;
1841 Error *local_err = NULL;
1843 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1844 backup = common->action->u.drive_backup;
1846 blk = blk_by_name(backup->device);
1848 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1849 "Device '%s' not found", backup->device);
1853 if (!blk_is_available(blk)) {
1854 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1858 /* AioContext is released in .clean() */
1859 state->aio_context = blk_get_aio_context(blk);
1860 aio_context_acquire(state->aio_context);
1861 bdrv_drained_begin(blk_bs(blk));
1862 state->bs = blk_bs(blk);
1864 do_drive_backup(backup->device, backup->target,
1865 backup->has_format, backup->format,
1867 backup->has_mode, backup->mode,
1868 backup->has_speed, backup->speed,
1869 backup->has_bitmap, backup->bitmap,
1870 backup->has_on_source_error, backup->on_source_error,
1871 backup->has_on_target_error, backup->on_target_error,
1872 common->block_job_txn, &local_err);
1874 error_propagate(errp, local_err);
1878 state->job = state->bs->job;
1881 static void drive_backup_abort(BlkActionState *common)
1883 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1884 BlockDriverState *bs = state->bs;
1886 /* Only cancel if it's the job we started */
1887 if (bs && bs->job && bs->job == state->job) {
1888 block_job_cancel_sync(bs->job);
1892 static void drive_backup_clean(BlkActionState *common)
1894 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1896 if (state->aio_context) {
1897 bdrv_drained_end(state->bs);
1898 aio_context_release(state->aio_context);
1902 typedef struct BlockdevBackupState {
1903 BlkActionState common;
1904 BlockDriverState *bs;
1906 AioContext *aio_context;
1907 } BlockdevBackupState;
1909 static void do_blockdev_backup(const char *device, const char *target,
1910 enum MirrorSyncMode sync,
1911 bool has_speed, int64_t speed,
1912 bool has_on_source_error,
1913 BlockdevOnError on_source_error,
1914 bool has_on_target_error,
1915 BlockdevOnError on_target_error,
1916 BlockJobTxn *txn, Error **errp);
1918 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
1920 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1921 BlockdevBackup *backup;
1922 BlockBackend *blk, *target;
1923 Error *local_err = NULL;
1925 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1926 backup = common->action->u.blockdev_backup;
1928 blk = blk_by_name(backup->device);
1930 error_setg(errp, "Device '%s' not found", backup->device);
1934 if (!blk_is_available(blk)) {
1935 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1939 target = blk_by_name(backup->target);
1941 error_setg(errp, "Device '%s' not found", backup->target);
1945 /* AioContext is released in .clean() */
1946 state->aio_context = blk_get_aio_context(blk);
1947 if (state->aio_context != blk_get_aio_context(target)) {
1948 state->aio_context = NULL;
1949 error_setg(errp, "Backup between two IO threads is not implemented");
1952 aio_context_acquire(state->aio_context);
1953 state->bs = blk_bs(blk);
1954 bdrv_drained_begin(state->bs);
1956 do_blockdev_backup(backup->device, backup->target,
1958 backup->has_speed, backup->speed,
1959 backup->has_on_source_error, backup->on_source_error,
1960 backup->has_on_target_error, backup->on_target_error,
1961 common->block_job_txn, &local_err);
1963 error_propagate(errp, local_err);
1967 state->job = state->bs->job;
1970 static void blockdev_backup_abort(BlkActionState *common)
1972 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1973 BlockDriverState *bs = state->bs;
1975 /* Only cancel if it's the job we started */
1976 if (bs && bs->job && bs->job == state->job) {
1977 block_job_cancel_sync(bs->job);
1981 static void blockdev_backup_clean(BlkActionState *common)
1983 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1985 if (state->aio_context) {
1986 bdrv_drained_end(state->bs);
1987 aio_context_release(state->aio_context);
1991 typedef struct BlockDirtyBitmapState {
1992 BlkActionState common;
1993 BdrvDirtyBitmap *bitmap;
1994 BlockDriverState *bs;
1995 AioContext *aio_context;
1998 } BlockDirtyBitmapState;
2000 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
2003 Error *local_err = NULL;
2004 BlockDirtyBitmapAdd *action;
2005 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2008 if (action_check_completion_mode(common, errp) < 0) {
2012 action = common->action->u.block_dirty_bitmap_add;
2013 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2014 qmp_block_dirty_bitmap_add(action->node, action->name,
2015 action->has_granularity, action->granularity,
2019 state->prepared = true;
2021 error_propagate(errp, local_err);
2025 static void block_dirty_bitmap_add_abort(BlkActionState *common)
2027 BlockDirtyBitmapAdd *action;
2028 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2031 action = common->action->u.block_dirty_bitmap_add;
2032 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2033 * then the node reference and bitmap name must have been valid.
2035 if (state->prepared) {
2036 qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
2040 static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
2043 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2045 BlockDirtyBitmap *action;
2047 if (action_check_completion_mode(common, errp) < 0) {
2051 action = common->action->u.block_dirty_bitmap_clear;
2052 state->bitmap = block_dirty_bitmap_lookup(action->node,
2055 &state->aio_context,
2057 if (!state->bitmap) {
2061 if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
2062 error_setg(errp, "Cannot modify a frozen bitmap");
2064 } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
2065 error_setg(errp, "Cannot clear a disabled bitmap");
2069 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2070 /* AioContext is released in .clean() */
2073 static void block_dirty_bitmap_clear_abort(BlkActionState *common)
2075 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2078 bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
2081 static void block_dirty_bitmap_clear_commit(BlkActionState *common)
2083 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2086 hbitmap_free(state->backup);
2089 static void block_dirty_bitmap_clear_clean(BlkActionState *common)
2091 BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
2094 if (state->aio_context) {
2095 aio_context_release(state->aio_context);
2099 static void abort_prepare(BlkActionState *common, Error **errp)
2101 error_setg(errp, "Transaction aborted using Abort action");
2104 static void abort_commit(BlkActionState *common)
2106 g_assert_not_reached(); /* this action never succeeds */
2109 static const BlkActionOps actions[] = {
2110 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
2111 .instance_size = sizeof(ExternalSnapshotState),
2112 .prepare = external_snapshot_prepare,
2113 .commit = external_snapshot_commit,
2114 .abort = external_snapshot_abort,
2115 .clean = external_snapshot_clean,
2117 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
2118 .instance_size = sizeof(ExternalSnapshotState),
2119 .prepare = external_snapshot_prepare,
2120 .commit = external_snapshot_commit,
2121 .abort = external_snapshot_abort,
2122 .clean = external_snapshot_clean,
2124 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
2125 .instance_size = sizeof(DriveBackupState),
2126 .prepare = drive_backup_prepare,
2127 .abort = drive_backup_abort,
2128 .clean = drive_backup_clean,
2130 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
2131 .instance_size = sizeof(BlockdevBackupState),
2132 .prepare = blockdev_backup_prepare,
2133 .abort = blockdev_backup_abort,
2134 .clean = blockdev_backup_clean,
2136 [TRANSACTION_ACTION_KIND_ABORT] = {
2137 .instance_size = sizeof(BlkActionState),
2138 .prepare = abort_prepare,
2139 .commit = abort_commit,
2141 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
2142 .instance_size = sizeof(InternalSnapshotState),
2143 .prepare = internal_snapshot_prepare,
2144 .abort = internal_snapshot_abort,
2145 .clean = internal_snapshot_clean,
2147 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
2148 .instance_size = sizeof(BlockDirtyBitmapState),
2149 .prepare = block_dirty_bitmap_add_prepare,
2150 .abort = block_dirty_bitmap_add_abort,
2152 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
2153 .instance_size = sizeof(BlockDirtyBitmapState),
2154 .prepare = block_dirty_bitmap_clear_prepare,
2155 .commit = block_dirty_bitmap_clear_commit,
2156 .abort = block_dirty_bitmap_clear_abort,
2157 .clean = block_dirty_bitmap_clear_clean,
2162 * Allocate a TransactionProperties structure if necessary, and fill
2163 * that structure with desired defaults if they are unset.
2165 static TransactionProperties *get_transaction_properties(
2166 TransactionProperties *props)
2169 props = g_new0(TransactionProperties, 1);
2172 if (!props->has_completion_mode) {
2173 props->has_completion_mode = true;
2174 props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL;
2181 * 'Atomic' group operations. The operations are performed as a set, and if
2182 * any fail then we roll back all operations in the group.
2184 void qmp_transaction(TransactionActionList *dev_list,
2186 struct TransactionProperties *props,
2189 TransactionActionList *dev_entry = dev_list;
2190 BlockJobTxn *block_job_txn = NULL;
2191 BlkActionState *state, *next;
2192 Error *local_err = NULL;
2194 QSIMPLEQ_HEAD(snap_bdrv_states, BlkActionState) snap_bdrv_states;
2195 QSIMPLEQ_INIT(&snap_bdrv_states);
2197 /* Does this transaction get canceled as a group on failure?
2198 * If not, we don't really need to make a BlockJobTxn.
2200 props = get_transaction_properties(props);
2201 if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2202 block_job_txn = block_job_txn_new();
2205 /* drain all i/o before any operations */
2208 /* We don't do anything in this loop that commits us to the operations */
2209 while (NULL != dev_entry) {
2210 TransactionAction *dev_info = NULL;
2211 const BlkActionOps *ops;
2213 dev_info = dev_entry->value;
2214 dev_entry = dev_entry->next;
2216 assert(dev_info->type < ARRAY_SIZE(actions));
2218 ops = &actions[dev_info->type];
2219 assert(ops->instance_size > 0);
2221 state = g_malloc0(ops->instance_size);
2223 state->action = dev_info;
2224 state->block_job_txn = block_job_txn;
2225 state->txn_props = props;
2226 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
2228 state->ops->prepare(state, &local_err);
2230 error_propagate(errp, local_err);
2231 goto delete_and_fail;
2235 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2236 if (state->ops->commit) {
2237 state->ops->commit(state);
2245 /* failure, and it is all-or-none; roll back all operations */
2246 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
2247 if (state->ops->abort) {
2248 state->ops->abort(state);
2252 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
2253 if (state->ops->clean) {
2254 state->ops->clean(state);
2259 qapi_free_TransactionProperties(props);
2261 block_job_txn_unref(block_job_txn);
2264 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
2266 Error *local_err = NULL;
2268 qmp_blockdev_open_tray(device, has_force, force, &local_err);
2270 error_propagate(errp, local_err);
2274 qmp_x_blockdev_remove_medium(device, errp);
2277 void qmp_block_passwd(bool has_device, const char *device,
2278 bool has_node_name, const char *node_name,
2279 const char *password, Error **errp)
2281 Error *local_err = NULL;
2282 BlockDriverState *bs;
2283 AioContext *aio_context;
2285 bs = bdrv_lookup_bs(has_device ? device : NULL,
2286 has_node_name ? node_name : NULL,
2289 error_propagate(errp, local_err);
2293 aio_context = bdrv_get_aio_context(bs);
2294 aio_context_acquire(aio_context);
2296 bdrv_add_key(bs, password, errp);
2298 aio_context_release(aio_context);
2301 void qmp_blockdev_open_tray(const char *device, bool has_force, bool force,
2311 blk = blk_by_name(device);
2313 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2314 "Device '%s' not found", device);
2318 if (!blk_dev_has_removable_media(blk)) {
2319 error_setg(errp, "Device '%s' is not removable", device);
2323 if (!blk_dev_has_tray(blk)) {
2324 /* Ignore this command on tray-less devices */
2328 if (blk_dev_is_tray_open(blk)) {
2332 locked = blk_dev_is_medium_locked(blk);
2334 blk_dev_eject_request(blk, force);
2337 if (!locked || force) {
2338 blk_dev_change_media_cb(blk, false);
2342 void qmp_blockdev_close_tray(const char *device, Error **errp)
2346 blk = blk_by_name(device);
2348 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2349 "Device '%s' not found", device);
2353 if (!blk_dev_has_removable_media(blk)) {
2354 error_setg(errp, "Device '%s' is not removable", device);
2358 if (!blk_dev_has_tray(blk)) {
2359 /* Ignore this command on tray-less devices */
2363 if (!blk_dev_is_tray_open(blk)) {
2367 blk_dev_change_media_cb(blk, true);
2370 void qmp_x_blockdev_remove_medium(const char *device, Error **errp)
2373 BlockDriverState *bs;
2374 AioContext *aio_context;
2377 blk = blk_by_name(device);
2379 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2380 "Device '%s' not found", device);
2384 /* For BBs without a device, we can exchange the BDS tree at will */
2385 has_device = blk_get_attached_dev(blk);
2387 if (has_device && !blk_dev_has_removable_media(blk)) {
2388 error_setg(errp, "Device '%s' is not removable", device);
2392 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2393 error_setg(errp, "Tray of device '%s' is not open", device);
2402 aio_context = bdrv_get_aio_context(bs);
2403 aio_context_acquire(aio_context);
2405 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2409 /* This follows the convention established by bdrv_make_anon() */
2410 if (bs->device_list.tqe_prev) {
2411 QTAILQ_REMOVE(&bdrv_states, bs, device_list);
2412 bs->device_list.tqe_prev = NULL;
2417 if (!blk_dev_has_tray(blk)) {
2418 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2419 * called at all); therefore, the medium needs to be ejected here.
2420 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2421 * value passed here (i.e. false). */
2422 blk_dev_change_media_cb(blk, false);
2426 aio_context_release(aio_context);
2429 static void qmp_blockdev_insert_anon_medium(const char *device,
2430 BlockDriverState *bs, Error **errp)
2435 blk = blk_by_name(device);
2437 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2438 "Device '%s' not found", device);
2442 /* For BBs without a device, we can exchange the BDS tree at will */
2443 has_device = blk_get_attached_dev(blk);
2445 if (has_device && !blk_dev_has_removable_media(blk)) {
2446 error_setg(errp, "Device '%s' is not removable", device);
2450 if (has_device && blk_dev_has_tray(blk) && !blk_dev_is_tray_open(blk)) {
2451 error_setg(errp, "Tray of device '%s' is not open", device);
2456 error_setg(errp, "There already is a medium in device '%s'", device);
2460 blk_insert_bs(blk, bs);
2462 QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list);
2464 if (!blk_dev_has_tray(blk)) {
2465 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2466 * called at all); therefore, the medium needs to be pushed into the
2468 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2469 * value passed here (i.e. true). */
2470 blk_dev_change_media_cb(blk, true);
2474 void qmp_x_blockdev_insert_medium(const char *device, const char *node_name,
2477 BlockDriverState *bs;
2479 bs = bdrv_find_node(node_name);
2481 error_setg(errp, "Node '%s' not found", node_name);
2486 error_setg(errp, "Node '%s' is already in use by '%s'", node_name,
2491 qmp_blockdev_insert_anon_medium(device, bs, errp);
2494 void qmp_blockdev_change_medium(const char *device, const char *filename,
2495 bool has_format, const char *format,
2497 BlockdevChangeReadOnlyMode read_only,
2501 BlockDriverState *medium_bs = NULL;
2502 int bdrv_flags, ret;
2503 QDict *options = NULL;
2506 blk = blk_by_name(device);
2508 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2509 "Device '%s' not found", device);
2514 blk_update_root_state(blk);
2517 bdrv_flags = blk_get_open_flags_from_root_state(blk);
2519 if (!has_read_only) {
2520 read_only = BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN;
2523 switch (read_only) {
2524 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN:
2527 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY:
2528 bdrv_flags &= ~BDRV_O_RDWR;
2531 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE:
2532 bdrv_flags |= BDRV_O_RDWR;
2540 options = qdict_new();
2541 qdict_put(options, "driver", qstring_from_str(format));
2545 ret = bdrv_open(&medium_bs, filename, NULL, options, bdrv_flags, errp);
2550 blk_apply_root_state(blk, medium_bs);
2552 bdrv_add_key(medium_bs, NULL, &err);
2554 error_propagate(errp, err);
2558 qmp_blockdev_open_tray(device, false, false, &err);
2560 error_propagate(errp, err);
2564 qmp_x_blockdev_remove_medium(device, &err);
2566 error_propagate(errp, err);
2570 qmp_blockdev_insert_anon_medium(device, medium_bs, &err);
2572 error_propagate(errp, err);
2576 qmp_blockdev_close_tray(device, errp);
2579 /* If the medium has been inserted, the device has its own reference, so
2580 * ours must be relinquished; and if it has not been inserted successfully,
2581 * the reference must be relinquished anyway */
2582 bdrv_unref(medium_bs);
2585 /* throttling disk I/O limits */
2586 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
2593 bool has_bps_rd_max,
2595 bool has_bps_wr_max,
2599 bool has_iops_rd_max,
2600 int64_t iops_rd_max,
2601 bool has_iops_wr_max,
2602 int64_t iops_wr_max,
2606 const char *group, Error **errp)
2609 BlockDriverState *bs;
2611 AioContext *aio_context;
2613 blk = blk_by_name(device);
2615 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2616 "Device '%s' not found", device);
2620 aio_context = blk_get_aio_context(blk);
2621 aio_context_acquire(aio_context);
2625 error_setg(errp, "Device '%s' has no medium", device);
2629 memset(&cfg, 0, sizeof(cfg));
2630 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2631 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2632 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2634 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2635 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2636 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2639 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2641 if (has_bps_rd_max) {
2642 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2644 if (has_bps_wr_max) {
2645 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2648 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2650 if (has_iops_rd_max) {
2651 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2653 if (has_iops_wr_max) {
2654 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2657 if (has_iops_size) {
2658 cfg.op_size = iops_size;
2661 if (!check_throttle_config(&cfg, errp)) {
2665 if (throttle_enabled(&cfg)) {
2666 /* Enable I/O limits if they're not enabled yet, otherwise
2667 * just update the throttling group. */
2668 if (!bs->throttle_state) {
2669 bdrv_io_limits_enable(bs, has_group ? group : device);
2670 } else if (has_group) {
2671 bdrv_io_limits_update_group(bs, group);
2673 /* Set the new throttling configuration */
2674 bdrv_set_io_limits(bs, &cfg);
2675 } else if (bs->throttle_state) {
2676 /* If all throttling settings are set to 0, disable I/O limits */
2677 bdrv_io_limits_disable(bs);
2681 aio_context_release(aio_context);
2684 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2685 bool has_granularity, uint32_t granularity,
2688 AioContext *aio_context;
2689 BlockDriverState *bs;
2691 if (!name || name[0] == '\0') {
2692 error_setg(errp, "Bitmap name cannot be empty");
2696 bs = bdrv_lookup_bs(node, node, errp);
2701 aio_context = bdrv_get_aio_context(bs);
2702 aio_context_acquire(aio_context);
2704 if (has_granularity) {
2705 if (granularity < 512 || !is_power_of_2(granularity)) {
2706 error_setg(errp, "Granularity must be power of 2 "
2707 "and at least 512");
2711 /* Default to cluster size, if available: */
2712 granularity = bdrv_get_default_bitmap_granularity(bs);
2715 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2718 aio_context_release(aio_context);
2721 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2724 AioContext *aio_context;
2725 BlockDriverState *bs;
2726 BdrvDirtyBitmap *bitmap;
2728 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2729 if (!bitmap || !bs) {
2733 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2735 "Bitmap '%s' is currently frozen and cannot be removed",
2739 bdrv_dirty_bitmap_make_anon(bitmap);
2740 bdrv_release_dirty_bitmap(bs, bitmap);
2743 aio_context_release(aio_context);
2747 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2748 * immediately after a full backup operation.
2750 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2753 AioContext *aio_context;
2754 BdrvDirtyBitmap *bitmap;
2755 BlockDriverState *bs;
2757 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2758 if (!bitmap || !bs) {
2762 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2764 "Bitmap '%s' is currently frozen and cannot be modified",
2767 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2769 "Bitmap '%s' is currently disabled and cannot be cleared",
2774 bdrv_clear_dirty_bitmap(bitmap, NULL);
2777 aio_context_release(aio_context);
2780 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2782 const char *id = qdict_get_str(qdict, "id");
2784 BlockDriverState *bs;
2785 AioContext *aio_context;
2786 Error *local_err = NULL;
2788 blk = blk_by_name(id);
2790 error_report("Device '%s' not found", id);
2794 if (!blk_legacy_dinfo(blk)) {
2795 error_report("Deleting device added with blockdev-add"
2796 " is not supported");
2800 aio_context = blk_get_aio_context(blk);
2801 aio_context_acquire(aio_context);
2805 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2806 error_report_err(local_err);
2807 aio_context_release(aio_context);
2814 /* if we have a device attached to this BlockDriverState
2815 * then we need to make the drive anonymous until the device
2816 * can be removed. If this is a drive with no device backing
2817 * then we can just get rid of the block driver state right here.
2819 if (blk_get_attached_dev(blk)) {
2820 blk_hide_on_behalf_of_hmp_drive_del(blk);
2821 /* Further I/O must not pause the guest */
2822 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2823 BLOCKDEV_ON_ERROR_REPORT);
2828 aio_context_release(aio_context);
2831 void qmp_block_resize(bool has_device, const char *device,
2832 bool has_node_name, const char *node_name,
2833 int64_t size, Error **errp)
2835 Error *local_err = NULL;
2836 BlockDriverState *bs;
2837 AioContext *aio_context;
2840 bs = bdrv_lookup_bs(has_device ? device : NULL,
2841 has_node_name ? node_name : NULL,
2844 error_propagate(errp, local_err);
2848 aio_context = bdrv_get_aio_context(bs);
2849 aio_context_acquire(aio_context);
2851 if (!bdrv_is_first_non_filter(bs)) {
2852 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2857 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2861 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2862 error_setg(errp, QERR_DEVICE_IN_USE, device);
2866 /* complete all in-flight operations before resizing the device */
2869 ret = bdrv_truncate(bs, size);
2874 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2877 error_setg(errp, QERR_UNSUPPORTED);
2880 error_setg(errp, "Device '%s' is read only", device);
2883 error_setg(errp, QERR_DEVICE_IN_USE, device);
2886 error_setg_errno(errp, -ret, "Could not resize");
2891 aio_context_release(aio_context);
2894 static void block_job_cb(void *opaque, int ret)
2896 /* Note that this function may be executed from another AioContext besides
2897 * the QEMU main loop. If you need to access anything that assumes the
2898 * QEMU global mutex, use a BH or introduce a mutex.
2901 BlockDriverState *bs = opaque;
2902 const char *msg = NULL;
2904 trace_block_job_cb(bs, bs->job, ret);
2909 msg = strerror(-ret);
2912 if (block_job_is_cancelled(bs->job)) {
2913 block_job_event_cancelled(bs->job);
2915 block_job_event_completed(bs->job, msg);
2919 void qmp_block_stream(const char *device,
2920 bool has_base, const char *base,
2921 bool has_backing_file, const char *backing_file,
2922 bool has_speed, int64_t speed,
2923 bool has_on_error, BlockdevOnError on_error,
2927 BlockDriverState *bs;
2928 BlockDriverState *base_bs = NULL;
2929 AioContext *aio_context;
2930 Error *local_err = NULL;
2931 const char *base_name = NULL;
2933 if (!has_on_error) {
2934 on_error = BLOCKDEV_ON_ERROR_REPORT;
2937 blk = blk_by_name(device);
2939 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2940 "Device '%s' not found", device);
2944 aio_context = blk_get_aio_context(blk);
2945 aio_context_acquire(aio_context);
2947 if (!blk_is_available(blk)) {
2948 error_setg(errp, "Device '%s' has no medium", device);
2953 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2958 base_bs = bdrv_find_backing_image(bs, base);
2959 if (base_bs == NULL) {
2960 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2963 assert(bdrv_get_aio_context(base_bs) == aio_context);
2967 /* if we are streaming the entire chain, the result will have no backing
2968 * file, and specifying one is therefore an error */
2969 if (base_bs == NULL && has_backing_file) {
2970 error_setg(errp, "backing file specified, but streaming the "
2975 /* backing_file string overrides base bs filename */
2976 base_name = has_backing_file ? backing_file : base_name;
2978 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2979 on_error, block_job_cb, bs, &local_err);
2981 error_propagate(errp, local_err);
2985 trace_qmp_block_stream(bs, bs->job);
2988 aio_context_release(aio_context);
2991 void qmp_block_commit(const char *device,
2992 bool has_base, const char *base,
2993 bool has_top, const char *top,
2994 bool has_backing_file, const char *backing_file,
2995 bool has_speed, int64_t speed,
2999 BlockDriverState *bs;
3000 BlockDriverState *base_bs, *top_bs;
3001 AioContext *aio_context;
3002 Error *local_err = NULL;
3003 /* This will be part of the QMP command, if/when the
3004 * BlockdevOnError change for blkmirror makes it in
3006 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
3013 * libvirt relies on the DeviceNotFound error class in order to probe for
3014 * live commit feature versions; for this to work, we must make sure to
3015 * perform the device lookup before any generic errors that may occur in a
3016 * scenario in which all optional arguments are omitted. */
3017 blk = blk_by_name(device);
3019 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3020 "Device '%s' not found", device);
3024 aio_context = blk_get_aio_context(blk);
3025 aio_context_acquire(aio_context);
3027 if (!blk_is_available(blk)) {
3028 error_setg(errp, "Device '%s' has no medium", device);
3033 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
3037 /* default top_bs is the active layer */
3040 if (has_top && top) {
3041 if (strcmp(bs->filename, top) != 0) {
3042 top_bs = bdrv_find_backing_image(bs, top);
3046 if (top_bs == NULL) {
3047 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
3051 assert(bdrv_get_aio_context(top_bs) == aio_context);
3053 if (has_base && base) {
3054 base_bs = bdrv_find_backing_image(top_bs, base);
3056 base_bs = bdrv_find_base(top_bs);
3059 if (base_bs == NULL) {
3060 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
3064 assert(bdrv_get_aio_context(base_bs) == aio_context);
3066 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
3070 /* Do not allow attempts to commit an image into itself */
3071 if (top_bs == base_bs) {
3072 error_setg(errp, "cannot commit an image into itself");
3077 if (has_backing_file) {
3078 error_setg(errp, "'backing-file' specified,"
3079 " but 'top' is the active layer");
3082 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
3085 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
3086 has_backing_file ? backing_file : NULL, &local_err);
3088 if (local_err != NULL) {
3089 error_propagate(errp, local_err);
3094 aio_context_release(aio_context);
3097 static void do_drive_backup(const char *device, const char *target,
3098 bool has_format, const char *format,
3099 enum MirrorSyncMode sync,
3100 bool has_mode, enum NewImageMode mode,
3101 bool has_speed, int64_t speed,
3102 bool has_bitmap, const char *bitmap,
3103 bool has_on_source_error,
3104 BlockdevOnError on_source_error,
3105 bool has_on_target_error,
3106 BlockdevOnError on_target_error,
3107 BlockJobTxn *txn, Error **errp)
3110 BlockDriverState *bs;
3111 BlockDriverState *target_bs;
3112 BlockDriverState *source = NULL;
3113 BdrvDirtyBitmap *bmap = NULL;
3114 AioContext *aio_context;
3115 QDict *options = NULL;
3116 Error *local_err = NULL;
3124 if (!has_on_source_error) {
3125 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3127 if (!has_on_target_error) {
3128 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3131 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3134 blk = blk_by_name(device);
3136 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3137 "Device '%s' not found", device);
3141 aio_context = blk_get_aio_context(blk);
3142 aio_context_acquire(aio_context);
3144 /* Although backup_run has this check too, we need to use bs->drv below, so
3145 * do an early check redundantly. */
3146 if (!blk_is_available(blk)) {
3147 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3153 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3156 /* Early check to avoid creating target */
3157 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
3161 flags = bs->open_flags | BDRV_O_RDWR;
3163 /* See if we have a backing HD we can use to create our new image
3165 if (sync == MIRROR_SYNC_MODE_TOP) {
3166 source = backing_bs(bs);
3168 sync = MIRROR_SYNC_MODE_FULL;
3171 if (sync == MIRROR_SYNC_MODE_NONE) {
3175 size = bdrv_getlength(bs);
3177 error_setg_errno(errp, -size, "bdrv_getlength failed");
3181 if (mode != NEW_IMAGE_MODE_EXISTING) {
3184 bdrv_img_create(target, format, source->filename,
3185 source->drv->format_name, NULL,
3186 size, flags, &local_err, false);
3188 bdrv_img_create(target, format, NULL, NULL, NULL,
3189 size, flags, &local_err, false);
3194 error_propagate(errp, local_err);
3199 options = qdict_new();
3200 qdict_put(options, "driver", qstring_from_str(format));
3204 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
3206 error_propagate(errp, local_err);
3210 bdrv_set_aio_context(target_bs, aio_context);
3213 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
3215 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
3216 bdrv_unref(target_bs);
3221 backup_start(bs, target_bs, speed, sync, bmap,
3222 on_source_error, on_target_error,
3223 block_job_cb, bs, txn, &local_err);
3224 if (local_err != NULL) {
3225 bdrv_unref(target_bs);
3226 error_propagate(errp, local_err);
3231 aio_context_release(aio_context);
3234 void qmp_drive_backup(const char *device, const char *target,
3235 bool has_format, const char *format,
3236 enum MirrorSyncMode sync,
3237 bool has_mode, enum NewImageMode mode,
3238 bool has_speed, int64_t speed,
3239 bool has_bitmap, const char *bitmap,
3240 bool has_on_source_error, BlockdevOnError on_source_error,
3241 bool has_on_target_error, BlockdevOnError on_target_error,
3244 return do_drive_backup(device, target, has_format, format, sync,
3245 has_mode, mode, has_speed, speed,
3247 has_on_source_error, on_source_error,
3248 has_on_target_error, on_target_error,
3252 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
3254 return bdrv_named_nodes_list(errp);
3257 void do_blockdev_backup(const char *device, const char *target,
3258 enum MirrorSyncMode sync,
3259 bool has_speed, int64_t speed,
3260 bool has_on_source_error,
3261 BlockdevOnError on_source_error,
3262 bool has_on_target_error,
3263 BlockdevOnError on_target_error,
3264 BlockJobTxn *txn, Error **errp)
3266 BlockBackend *blk, *target_blk;
3267 BlockDriverState *bs;
3268 BlockDriverState *target_bs;
3269 Error *local_err = NULL;
3270 AioContext *aio_context;
3275 if (!has_on_source_error) {
3276 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3278 if (!has_on_target_error) {
3279 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3282 blk = blk_by_name(device);
3284 error_setg(errp, "Device '%s' not found", device);
3288 aio_context = blk_get_aio_context(blk);
3289 aio_context_acquire(aio_context);
3291 if (!blk_is_available(blk)) {
3292 error_setg(errp, "Device '%s' has no medium", device);
3297 target_blk = blk_by_name(target);
3299 error_setg(errp, "Device '%s' not found", target);
3303 if (!blk_is_available(target_blk)) {
3304 error_setg(errp, "Device '%s' has no medium", target);
3307 target_bs = blk_bs(target_blk);
3309 bdrv_ref(target_bs);
3310 bdrv_set_aio_context(target_bs, aio_context);
3311 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
3312 on_target_error, block_job_cb, bs, txn, &local_err);
3313 if (local_err != NULL) {
3314 bdrv_unref(target_bs);
3315 error_propagate(errp, local_err);
3318 aio_context_release(aio_context);
3321 void qmp_blockdev_backup(const char *device, const char *target,
3322 enum MirrorSyncMode sync,
3323 bool has_speed, int64_t speed,
3324 bool has_on_source_error,
3325 BlockdevOnError on_source_error,
3326 bool has_on_target_error,
3327 BlockdevOnError on_target_error,
3330 do_blockdev_backup(device, target, sync, has_speed, speed,
3331 has_on_source_error, on_source_error,
3332 has_on_target_error, on_target_error,
3336 /* Parameter check and block job starting for drive mirroring.
3337 * Caller should hold @device and @target's aio context (must be the same).
3339 static void blockdev_mirror_common(BlockDriverState *bs,
3340 BlockDriverState *target,
3341 bool has_replaces, const char *replaces,
3342 enum MirrorSyncMode sync,
3343 bool has_speed, int64_t speed,
3344 bool has_granularity, uint32_t granularity,
3345 bool has_buf_size, int64_t buf_size,
3346 bool has_on_source_error,
3347 BlockdevOnError on_source_error,
3348 bool has_on_target_error,
3349 BlockdevOnError on_target_error,
3350 bool has_unmap, bool unmap,
3357 if (!has_on_source_error) {
3358 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3360 if (!has_on_target_error) {
3361 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3363 if (!has_granularity) {
3366 if (!has_buf_size) {
3373 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3374 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3375 "a value in range [512B, 64MB]");
3378 if (granularity & (granularity - 1)) {
3379 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3384 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3387 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
3391 error_setg(errp, "Cannot mirror to an attached block device");
3395 if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
3396 sync = MIRROR_SYNC_MODE_FULL;
3399 /* pass the node name to replace to mirror start since it's loose coupling
3400 * and will allow to check whether the node still exist at mirror completion
3402 mirror_start(bs, target,
3403 has_replaces ? replaces : NULL,
3404 speed, granularity, buf_size, sync,
3405 on_source_error, on_target_error, unmap,
3406 block_job_cb, bs, errp);
3409 void qmp_drive_mirror(const char *device, const char *target,
3410 bool has_format, const char *format,
3411 bool has_node_name, const char *node_name,
3412 bool has_replaces, const char *replaces,
3413 enum MirrorSyncMode sync,
3414 bool has_mode, enum NewImageMode mode,
3415 bool has_speed, int64_t speed,
3416 bool has_granularity, uint32_t granularity,
3417 bool has_buf_size, int64_t buf_size,
3418 bool has_on_source_error, BlockdevOnError on_source_error,
3419 bool has_on_target_error, BlockdevOnError on_target_error,
3420 bool has_unmap, bool unmap,
3423 BlockDriverState *bs;
3425 BlockDriverState *source, *target_bs;
3426 AioContext *aio_context;
3427 Error *local_err = NULL;
3428 QDict *options = NULL;
3433 blk = blk_by_name(device);
3435 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3436 "Device '%s' not found", device);
3440 aio_context = blk_get_aio_context(blk);
3441 aio_context_acquire(aio_context);
3443 if (!blk_is_available(blk)) {
3444 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3449 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3453 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3456 flags = bs->open_flags | BDRV_O_RDWR;
3457 source = backing_bs(bs);
3458 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
3459 sync = MIRROR_SYNC_MODE_FULL;
3461 if (sync == MIRROR_SYNC_MODE_NONE) {
3465 size = bdrv_getlength(bs);
3467 error_setg_errno(errp, -size, "bdrv_getlength failed");
3472 BlockDriverState *to_replace_bs;
3473 AioContext *replace_aio_context;
3474 int64_t replace_size;
3476 if (!has_node_name) {
3477 error_setg(errp, "a node-name must be provided when replacing a"
3478 " named node of the graph");
3482 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
3484 if (!to_replace_bs) {
3485 error_propagate(errp, local_err);
3489 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3490 aio_context_acquire(replace_aio_context);
3491 replace_size = bdrv_getlength(to_replace_bs);
3492 aio_context_release(replace_aio_context);
3494 if (size != replace_size) {
3495 error_setg(errp, "cannot replace image with a mirror image of "
3501 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
3502 && mode != NEW_IMAGE_MODE_EXISTING)
3504 /* create new image w/o backing file */
3506 bdrv_img_create(target, format,
3507 NULL, NULL, NULL, size, flags, &local_err, false);
3510 case NEW_IMAGE_MODE_EXISTING:
3512 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3513 /* create new image with backing file */
3514 bdrv_img_create(target, format,
3516 source->drv->format_name,
3517 NULL, size, flags, &local_err, false);
3525 error_propagate(errp, local_err);
3529 options = qdict_new();
3530 if (has_node_name) {
3531 qdict_put(options, "node-name", qstring_from_str(node_name));
3534 qdict_put(options, "driver", qstring_from_str(format));
3537 /* Mirroring takes care of copy-on-write using the source's backing
3541 ret = bdrv_open(&target_bs, target, NULL, options,
3542 flags | BDRV_O_NO_BACKING, &local_err);
3544 error_propagate(errp, local_err);
3548 bdrv_set_aio_context(target_bs, aio_context);
3550 blockdev_mirror_common(bs, target_bs,
3551 has_replaces, replaces, sync,
3553 has_granularity, granularity,
3554 has_buf_size, buf_size,
3555 has_on_source_error, on_source_error,
3556 has_on_target_error, on_target_error,
3560 error_propagate(errp, local_err);
3561 bdrv_unref(target_bs);
3564 aio_context_release(aio_context);
3567 void qmp_blockdev_mirror(const char *device, const char *target,
3568 bool has_replaces, const char *replaces,
3569 MirrorSyncMode sync,
3570 bool has_speed, int64_t speed,
3571 bool has_granularity, uint32_t granularity,
3572 bool has_buf_size, int64_t buf_size,
3573 bool has_on_source_error,
3574 BlockdevOnError on_source_error,
3575 bool has_on_target_error,
3576 BlockdevOnError on_target_error,
3579 BlockDriverState *bs;
3581 BlockDriverState *target_bs;
3582 AioContext *aio_context;
3583 Error *local_err = NULL;
3585 blk = blk_by_name(device);
3587 error_setg(errp, "Device '%s' not found", device);
3593 error_setg(errp, "Device '%s' has no media", device);
3597 target_bs = bdrv_lookup_bs(target, target, errp);
3602 aio_context = bdrv_get_aio_context(bs);
3603 aio_context_acquire(aio_context);
3605 bdrv_ref(target_bs);
3606 bdrv_set_aio_context(target_bs, aio_context);
3608 blockdev_mirror_common(bs, target_bs,
3609 has_replaces, replaces, sync,
3611 has_granularity, granularity,
3612 has_buf_size, buf_size,
3613 has_on_source_error, on_source_error,
3614 has_on_target_error, on_target_error,
3618 error_propagate(errp, local_err);
3619 bdrv_unref(target_bs);
3622 aio_context_release(aio_context);
3625 /* Get the block job for a given device name and acquire its AioContext */
3626 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
3630 BlockDriverState *bs;
3632 *aio_context = NULL;
3634 blk = blk_by_name(device);
3639 *aio_context = blk_get_aio_context(blk);
3640 aio_context_acquire(*aio_context);
3642 if (!blk_is_available(blk)) {
3654 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3655 "No active block job on device '%s'", device);
3657 aio_context_release(*aio_context);
3658 *aio_context = NULL;
3663 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3665 AioContext *aio_context;
3666 BlockJob *job = find_block_job(device, &aio_context, errp);
3672 block_job_set_speed(job, speed, errp);
3673 aio_context_release(aio_context);
3676 void qmp_block_job_cancel(const char *device,
3677 bool has_force, bool force, Error **errp)
3679 AioContext *aio_context;
3680 BlockJob *job = find_block_job(device, &aio_context, errp);
3690 if (job->user_paused && !force) {
3691 error_setg(errp, "The block job for device '%s' is currently paused",
3696 trace_qmp_block_job_cancel(job);
3697 block_job_cancel(job);
3699 aio_context_release(aio_context);
3702 void qmp_block_job_pause(const char *device, Error **errp)
3704 AioContext *aio_context;
3705 BlockJob *job = find_block_job(device, &aio_context, errp);
3707 if (!job || job->user_paused) {
3711 job->user_paused = true;
3712 trace_qmp_block_job_pause(job);
3713 block_job_pause(job);
3714 aio_context_release(aio_context);
3717 void qmp_block_job_resume(const char *device, Error **errp)
3719 AioContext *aio_context;
3720 BlockJob *job = find_block_job(device, &aio_context, errp);
3722 if (!job || !job->user_paused) {
3726 job->user_paused = false;
3727 trace_qmp_block_job_resume(job);
3728 block_job_resume(job);
3729 aio_context_release(aio_context);
3732 void qmp_block_job_complete(const char *device, Error **errp)
3734 AioContext *aio_context;
3735 BlockJob *job = find_block_job(device, &aio_context, errp);
3741 trace_qmp_block_job_complete(job);
3742 block_job_complete(job, errp);
3743 aio_context_release(aio_context);
3746 void qmp_change_backing_file(const char *device,
3747 const char *image_node_name,
3748 const char *backing_file,
3752 BlockDriverState *bs = NULL;
3753 AioContext *aio_context;
3754 BlockDriverState *image_bs = NULL;
3755 Error *local_err = NULL;
3760 blk = blk_by_name(device);
3762 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3763 "Device '%s' not found", device);
3767 aio_context = blk_get_aio_context(blk);
3768 aio_context_acquire(aio_context);
3770 if (!blk_is_available(blk)) {
3771 error_setg(errp, "Device '%s' has no medium", device);
3776 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3778 error_propagate(errp, local_err);
3783 error_setg(errp, "image file not found");
3787 if (bdrv_find_base(image_bs) == image_bs) {
3788 error_setg(errp, "not allowing backing file change on an image "
3789 "without a backing file");
3793 /* even though we are not necessarily operating on bs, we need it to
3794 * determine if block ops are currently prohibited on the chain */
3795 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3799 /* final sanity check */
3800 if (!bdrv_chain_contains(bs, image_bs)) {
3801 error_setg(errp, "'%s' and image file are not in the same chain",
3806 /* if not r/w, reopen to make r/w */
3807 open_flags = image_bs->open_flags;
3808 ro = bdrv_is_read_only(image_bs);
3811 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3813 error_propagate(errp, local_err);
3818 ret = bdrv_change_backing_file(image_bs, backing_file,
3819 image_bs->drv ? image_bs->drv->format_name : "");
3822 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3824 /* don't exit here, so we can try to restore open flags if
3829 bdrv_reopen(image_bs, open_flags, &local_err);
3831 error_propagate(errp, local_err); /* will preserve prior errp */
3836 aio_context_release(aio_context);
3839 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3841 QmpOutputVisitor *ov = qmp_output_visitor_new();
3842 BlockDriverState *bs;
3843 BlockBackend *blk = NULL;
3846 Error *local_err = NULL;
3848 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3849 * cache.direct=false instead of silently switching to aio=threads, except
3850 * when called from drive_new().
3852 * For now, simply forbidding the combination for all drivers will do. */
3853 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3854 bool direct = options->has_cache &&
3855 options->cache->has_direct &&
3856 options->cache->direct;
3858 error_setg(errp, "aio=native requires cache.direct=true");
3863 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
3864 &options, NULL, &local_err);
3866 error_propagate(errp, local_err);
3870 obj = qmp_output_get_qobject(ov);
3871 qdict = qobject_to_qdict(obj);
3873 qdict_flatten(qdict);
3875 if (options->has_id) {
3876 blk = blockdev_init(NULL, qdict, &local_err);
3878 error_propagate(errp, local_err);
3884 if (!qdict_get_try_str(qdict, "node-name")) {
3885 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3890 bs = bds_tree_init(qdict, errp);
3895 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
3898 if (bs && bdrv_key_required(bs)) {
3902 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3905 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3910 qmp_output_visitor_cleanup(ov);
3913 void qmp_x_blockdev_del(bool has_id, const char *id,
3914 bool has_node_name, const char *node_name, Error **errp)
3916 AioContext *aio_context;
3918 BlockDriverState *bs;
3920 if (has_id && has_node_name) {
3921 error_setg(errp, "Only one of id and node-name must be specified");
3923 } else if (!has_id && !has_node_name) {
3924 error_setg(errp, "No block device specified");
3929 blk = blk_by_name(id);
3931 error_setg(errp, "Cannot find block backend %s", id);
3934 if (blk_get_refcnt(blk) > 1) {
3935 error_setg(errp, "Block backend %s is in use", id);
3939 aio_context = blk_get_aio_context(blk);
3941 bs = bdrv_find_node(node_name);
3943 error_setg(errp, "Cannot find node %s", node_name);
3948 error_setg(errp, "Node %s is in use by %s",
3949 node_name, blk_name(blk));
3952 aio_context = bdrv_get_aio_context(bs);
3955 aio_context_acquire(aio_context);
3958 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
3962 if (!blk && !bs->monitor_list.tqe_prev) {
3963 error_setg(errp, "Node %s is not owned by the monitor",
3968 if (bs->refcnt > 1) {
3969 error_setg(errp, "Block device %s is in use",
3970 bdrv_get_device_or_node_name(bs));
3978 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3983 aio_context_release(aio_context);
3986 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3988 BlockJobInfoList *head = NULL, **p_next = &head;
3989 BlockDriverState *bs;
3991 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3992 AioContext *aio_context = bdrv_get_aio_context(bs);
3994 aio_context_acquire(aio_context);
3997 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
3998 elem->value = block_job_query(bs->job);
4000 p_next = &elem->next;
4003 aio_context_release(aio_context);
4009 QemuOptsList qemu_common_drive_opts = {
4011 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4015 .type = QEMU_OPT_BOOL,
4016 .help = "enable/disable snapshot mode",
4019 .type = QEMU_OPT_STRING,
4020 .help = "discard operation (ignore/off, unmap/on)",
4023 .type = QEMU_OPT_STRING,
4024 .help = "host AIO implementation (threads, native)",
4027 .type = QEMU_OPT_STRING,
4028 .help = "disk format (raw, qcow2, ...)",
4031 .type = QEMU_OPT_STRING,
4032 .help = "read error action",
4035 .type = QEMU_OPT_STRING,
4036 .help = "write error action",
4038 .name = "read-only",
4039 .type = QEMU_OPT_BOOL,
4040 .help = "open drive file as read-only",
4042 .name = "throttling.iops-total",
4043 .type = QEMU_OPT_NUMBER,
4044 .help = "limit total I/O operations per second",
4046 .name = "throttling.iops-read",
4047 .type = QEMU_OPT_NUMBER,
4048 .help = "limit read operations per second",
4050 .name = "throttling.iops-write",
4051 .type = QEMU_OPT_NUMBER,
4052 .help = "limit write operations per second",
4054 .name = "throttling.bps-total",
4055 .type = QEMU_OPT_NUMBER,
4056 .help = "limit total bytes per second",
4058 .name = "throttling.bps-read",
4059 .type = QEMU_OPT_NUMBER,
4060 .help = "limit read bytes per second",
4062 .name = "throttling.bps-write",
4063 .type = QEMU_OPT_NUMBER,
4064 .help = "limit write bytes per second",
4066 .name = "throttling.iops-total-max",
4067 .type = QEMU_OPT_NUMBER,
4068 .help = "I/O operations burst",
4070 .name = "throttling.iops-read-max",
4071 .type = QEMU_OPT_NUMBER,
4072 .help = "I/O operations read burst",
4074 .name = "throttling.iops-write-max",
4075 .type = QEMU_OPT_NUMBER,
4076 .help = "I/O operations write burst",
4078 .name = "throttling.bps-total-max",
4079 .type = QEMU_OPT_NUMBER,
4080 .help = "total bytes burst",
4082 .name = "throttling.bps-read-max",
4083 .type = QEMU_OPT_NUMBER,
4084 .help = "total bytes read burst",
4086 .name = "throttling.bps-write-max",
4087 .type = QEMU_OPT_NUMBER,
4088 .help = "total bytes write burst",
4090 .name = "throttling.iops-size",
4091 .type = QEMU_OPT_NUMBER,
4092 .help = "when limiting by iops max size of an I/O in bytes",
4094 .name = "throttling.group",
4095 .type = QEMU_OPT_STRING,
4096 .help = "name of the block throttling group",
4098 .name = "copy-on-read",
4099 .type = QEMU_OPT_BOOL,
4100 .help = "copy read data from backing file into image file",
4102 .name = "detect-zeroes",
4103 .type = QEMU_OPT_STRING,
4104 .help = "try to optimize zero writes (off, on, unmap)",
4106 .name = "stats-account-invalid",
4107 .type = QEMU_OPT_BOOL,
4108 .help = "whether to account for invalid I/O operations "
4109 "in the statistics",
4111 .name = "stats-account-failed",
4112 .type = QEMU_OPT_BOOL,
4113 .help = "whether to account for failed I/O operations "
4114 "in the statistics",
4116 { /* end of list */ }
4120 static QemuOptsList qemu_root_bds_opts = {
4122 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
4126 .type = QEMU_OPT_STRING,
4127 .help = "discard operation (ignore/off, unmap/on)",
4130 .type = QEMU_OPT_STRING,
4131 .help = "host AIO implementation (threads, native)",
4133 .name = "read-only",
4134 .type = QEMU_OPT_BOOL,
4135 .help = "open drive file as read-only",
4137 .name = "copy-on-read",
4138 .type = QEMU_OPT_BOOL,
4139 .help = "copy read data from backing file into image file",
4141 .name = "detect-zeroes",
4142 .type = QEMU_OPT_STRING,
4143 .help = "try to optimize zero writes (off, on, unmap)",
4145 { /* end of list */ }
4149 QemuOptsList qemu_drive_opts = {
4151 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
4154 * no elements => accept any params
4155 * validation will happen later
4157 { /* end of list */ }