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 const char *const if_name
[IF_COUNT
] = {
57 [IF_FLOPPY
] = "floppy",
58 [IF_PFLASH
] = "pflash",
61 [IF_VIRTIO
] = "virtio",
65 static int if_max_devs
[IF_COUNT
] = {
67 * Do not change these numbers! They govern how drive option
68 * index maps to unit and bus. That mapping is ABI.
70 * All controllers used to imlement if=T drives need to support
71 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
72 * Otherwise, some index values map to "impossible" bus, unit
75 * For instance, if you change [IF_SCSI] to 255, -drive
76 * if=scsi,index=12 no longer means bus=1,unit=5, but
77 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
78 * the drive can't be set up. Regression.
85 * Boards may call this to offer board-by-board overrides
86 * of the default, global values.
88 void override_max_devs(BlockInterfaceType type
, int max_devs
)
97 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
98 dinfo
= blk_legacy_dinfo(blk
);
99 if (dinfo
->type
== type
) {
100 fprintf(stderr
, "Cannot override units-per-bus property of"
101 " the %s interface, because a drive of that type has"
102 " already been added.\n", if_name
[type
]);
103 g_assert_not_reached();
107 if_max_devs
[type
] = max_devs
;
111 * We automatically delete the drive when a device using it gets
112 * unplugged. Questionable feature, but we can't just drop it.
113 * Device models call blockdev_mark_auto_del() to schedule the
114 * automatic deletion, and generic qdev code calls blockdev_auto_del()
115 * when deletion is actually safe.
117 void blockdev_mark_auto_del(BlockBackend
*blk
)
119 DriveInfo
*dinfo
= blk_legacy_dinfo(blk
);
120 BlockDriverState
*bs
= blk_bs(blk
);
121 AioContext
*aio_context
;
128 aio_context
= bdrv_get_aio_context(bs
);
129 aio_context_acquire(aio_context
);
132 block_job_cancel(bs
->job
);
135 aio_context_release(aio_context
);
141 void blockdev_auto_del(BlockBackend
*blk
)
143 DriveInfo
*dinfo
= blk_legacy_dinfo(blk
);
145 if (dinfo
&& dinfo
->auto_del
) {
151 * Returns the current mapping of how many units per bus
152 * a particular interface can support.
154 * A positive integer indicates n units per bus.
155 * 0 implies the mapping has not been established.
156 * -1 indicates an invalid BlockInterfaceType was given.
158 int drive_get_max_devs(BlockInterfaceType type
)
160 if (type
>= IF_IDE
&& type
< IF_COUNT
) {
161 return if_max_devs
[type
];
167 static int drive_index_to_bus_id(BlockInterfaceType type
, int index
)
169 int max_devs
= if_max_devs
[type
];
170 return max_devs
? index
/ max_devs
: 0;
173 static int drive_index_to_unit_id(BlockInterfaceType type
, int index
)
175 int max_devs
= if_max_devs
[type
];
176 return max_devs
? index
% max_devs
: index
;
179 QemuOpts
*drive_def(const char *optstr
)
181 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr
, false);
184 QemuOpts
*drive_add(BlockInterfaceType type
, int index
, const char *file
,
189 opts
= drive_def(optstr
);
193 if (type
!= IF_DEFAULT
) {
194 qemu_opt_set(opts
, "if", if_name
[type
], &error_abort
);
197 qemu_opt_set_number(opts
, "index", index
, &error_abort
);
200 qemu_opt_set(opts
, "file", file
, &error_abort
);
204 DriveInfo
*drive_get(BlockInterfaceType type
, int bus
, int unit
)
209 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
210 dinfo
= blk_legacy_dinfo(blk
);
211 if (dinfo
&& dinfo
->type
== type
212 && dinfo
->bus
== bus
&& dinfo
->unit
== unit
) {
220 bool drive_check_orphaned(void)
226 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
227 dinfo
= blk_legacy_dinfo(blk
);
228 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
229 /* Unless this is a default drive, this may be an oversight. */
230 if (!blk_get_attached_dev(blk
) && !dinfo
->is_default
&&
231 dinfo
->type
!= IF_NONE
) {
232 fprintf(stderr
, "Warning: Orphaned drive without device: "
233 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
234 blk_name(blk
), blk_bs(blk
) ? blk_bs(blk
)->filename
: "",
235 if_name
[dinfo
->type
], dinfo
->bus
, dinfo
->unit
);
243 DriveInfo
*drive_get_by_index(BlockInterfaceType type
, int index
)
245 return drive_get(type
,
246 drive_index_to_bus_id(type
, index
),
247 drive_index_to_unit_id(type
, index
));
250 int drive_get_max_bus(BlockInterfaceType type
)
257 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
258 dinfo
= blk_legacy_dinfo(blk
);
259 if (dinfo
&& dinfo
->type
== type
&& dinfo
->bus
> max_bus
) {
260 max_bus
= dinfo
->bus
;
266 /* Get a block device. This should only be used for single-drive devices
267 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
269 DriveInfo
*drive_get_next(BlockInterfaceType type
)
271 static int next_block_unit
[IF_COUNT
];
273 return drive_get(type
, 0, next_block_unit
[type
]++);
276 static void bdrv_format_print(void *opaque
, const char *name
)
278 error_printf(" %s", name
);
283 BlockDriverState
*bs
;
286 static int parse_block_error_action(const char *buf
, bool is_read
, Error
**errp
)
288 if (!strcmp(buf
, "ignore")) {
289 return BLOCKDEV_ON_ERROR_IGNORE
;
290 } else if (!is_read
&& !strcmp(buf
, "enospc")) {
291 return BLOCKDEV_ON_ERROR_ENOSPC
;
292 } else if (!strcmp(buf
, "stop")) {
293 return BLOCKDEV_ON_ERROR_STOP
;
294 } else if (!strcmp(buf
, "report")) {
295 return BLOCKDEV_ON_ERROR_REPORT
;
297 error_setg(errp
, "'%s' invalid %s error action",
298 buf
, is_read
? "read" : "write");
303 static bool check_throttle_config(ThrottleConfig
*cfg
, Error
**errp
)
305 if (throttle_conflicting(cfg
)) {
306 error_setg(errp
, "bps/iops/max total values and read/write values"
307 " cannot be used at the same time");
311 if (!throttle_is_valid(cfg
)) {
312 error_setg(errp
, "bps/iops/maxs values must be 0 or greater");
316 if (throttle_max_is_missing_limit(cfg
)) {
317 error_setg(errp
, "bps_max/iops_max require corresponding"
325 typedef enum { MEDIA_DISK
, MEDIA_CDROM
} DriveMediaType
;
327 /* All parameters but @opts are optional and may be set to NULL. */
328 static void extract_common_blockdev_options(QemuOpts
*opts
, int *bdrv_flags
,
329 const char **throttling_group
, ThrottleConfig
*throttle_cfg
,
330 BlockdevDetectZeroesOptions
*detect_zeroes
, Error
**errp
)
333 Error
*local_error
= NULL
;
337 if (!qemu_opt_get_bool(opts
, "read-only", false)) {
338 *bdrv_flags
|= BDRV_O_RDWR
;
340 if (qemu_opt_get_bool(opts
, "copy-on-read", false)) {
341 *bdrv_flags
|= BDRV_O_COPY_ON_READ
;
344 if ((discard
= qemu_opt_get(opts
, "discard")) != NULL
) {
345 if (bdrv_parse_discard_flags(discard
, bdrv_flags
) != 0) {
346 error_setg(errp
, "Invalid discard option");
351 if (qemu_opt_get_bool(opts
, BDRV_OPT_CACHE_WB
, true)) {
352 *bdrv_flags
|= BDRV_O_CACHE_WB
;
354 if (qemu_opt_get_bool(opts
, BDRV_OPT_CACHE_DIRECT
, false)) {
355 *bdrv_flags
|= BDRV_O_NOCACHE
;
357 if (qemu_opt_get_bool(opts
, BDRV_OPT_CACHE_NO_FLUSH
, false)) {
358 *bdrv_flags
|= BDRV_O_NO_FLUSH
;
361 if ((aio
= qemu_opt_get(opts
, "aio")) != NULL
) {
362 if (!strcmp(aio
, "native")) {
363 *bdrv_flags
|= BDRV_O_NATIVE_AIO
;
364 } else if (!strcmp(aio
, "threads")) {
365 /* this is the default */
367 error_setg(errp
, "invalid aio option");
373 /* disk I/O throttling */
374 if (throttling_group
) {
375 *throttling_group
= qemu_opt_get(opts
, "throttling.group");
379 memset(throttle_cfg
, 0, sizeof(*throttle_cfg
));
380 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].avg
=
381 qemu_opt_get_number(opts
, "throttling.bps-total", 0);
382 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].avg
=
383 qemu_opt_get_number(opts
, "throttling.bps-read", 0);
384 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].avg
=
385 qemu_opt_get_number(opts
, "throttling.bps-write", 0);
386 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].avg
=
387 qemu_opt_get_number(opts
, "throttling.iops-total", 0);
388 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].avg
=
389 qemu_opt_get_number(opts
, "throttling.iops-read", 0);
390 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].avg
=
391 qemu_opt_get_number(opts
, "throttling.iops-write", 0);
393 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].max
=
394 qemu_opt_get_number(opts
, "throttling.bps-total-max", 0);
395 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].max
=
396 qemu_opt_get_number(opts
, "throttling.bps-read-max", 0);
397 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].max
=
398 qemu_opt_get_number(opts
, "throttling.bps-write-max", 0);
399 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].max
=
400 qemu_opt_get_number(opts
, "throttling.iops-total-max", 0);
401 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].max
=
402 qemu_opt_get_number(opts
, "throttling.iops-read-max", 0);
403 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].max
=
404 qemu_opt_get_number(opts
, "throttling.iops-write-max", 0);
406 throttle_cfg
->op_size
=
407 qemu_opt_get_number(opts
, "throttling.iops-size", 0);
409 if (!check_throttle_config(throttle_cfg
, errp
)) {
416 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup
,
417 qemu_opt_get(opts
, "detect-zeroes"),
418 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX
,
419 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
,
422 error_propagate(errp
, local_error
);
427 *detect_zeroes
== BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP
&&
428 !(*bdrv_flags
& BDRV_O_UNMAP
))
430 error_setg(errp
, "setting detect-zeroes to unmap is not allowed "
431 "without setting discard operation to unmap");
437 /* Takes the ownership of bs_opts */
438 static BlockBackend
*blockdev_init(const char *file
, QDict
*bs_opts
,
443 int on_read_error
, on_write_error
;
445 BlockDriverState
*bs
;
451 bool has_driver_specific_opts
;
452 BlockdevDetectZeroesOptions detect_zeroes
=
453 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
;
454 const char *throttling_group
= NULL
;
456 /* Check common options by copying from bs_opts to opts, all other options
457 * stay in bs_opts for processing by bdrv_open(). */
458 id
= qdict_get_try_str(bs_opts
, "id");
459 opts
= qemu_opts_create(&qemu_common_drive_opts
, id
, 1, &error
);
461 error_propagate(errp
, error
);
465 qemu_opts_absorb_qdict(opts
, bs_opts
, &error
);
467 error_propagate(errp
, error
);
472 qdict_del(bs_opts
, "id");
475 has_driver_specific_opts
= !!qdict_size(bs_opts
);
477 /* extract parameters */
478 snapshot
= qemu_opt_get_bool(opts
, "snapshot", 0);
480 extract_common_blockdev_options(opts
, &bdrv_flags
, &throttling_group
, &cfg
,
481 &detect_zeroes
, &error
);
483 error_propagate(errp
, error
);
487 if ((buf
= qemu_opt_get(opts
, "format")) != NULL
) {
488 if (is_help_option(buf
)) {
489 error_printf("Supported formats:");
490 bdrv_iterate_format(bdrv_format_print
, NULL
);
495 if (qdict_haskey(bs_opts
, "driver")) {
496 error_setg(errp
, "Cannot specify both 'driver' and 'format'");
499 qdict_put(bs_opts
, "driver", qstring_from_str(buf
));
502 on_write_error
= BLOCKDEV_ON_ERROR_ENOSPC
;
503 if ((buf
= qemu_opt_get(opts
, "werror")) != NULL
) {
504 on_write_error
= parse_block_error_action(buf
, 0, &error
);
506 error_propagate(errp
, error
);
511 on_read_error
= BLOCKDEV_ON_ERROR_REPORT
;
512 if ((buf
= qemu_opt_get(opts
, "rerror")) != NULL
) {
513 on_read_error
= parse_block_error_action(buf
, 1, &error
);
515 error_propagate(errp
, error
);
521 /* always use cache=unsafe with snapshot */
522 bdrv_flags
&= ~BDRV_O_CACHE_MASK
;
523 bdrv_flags
|= (BDRV_O_SNAPSHOT
|BDRV_O_CACHE_WB
|BDRV_O_NO_FLUSH
);
527 if ((!file
|| !*file
) && !has_driver_specific_opts
) {
528 BlockBackendRootState
*blk_rs
;
530 blk
= blk_new(qemu_opts_id(opts
), errp
);
535 blk_rs
= blk_get_root_state(blk
);
536 blk_rs
->open_flags
= bdrv_flags
;
537 blk_rs
->read_only
= !(bdrv_flags
& BDRV_O_RDWR
);
538 blk_rs
->detect_zeroes
= detect_zeroes
;
540 if (throttle_enabled(&cfg
)) {
541 if (!throttling_group
) {
542 throttling_group
= blk_name(blk
);
544 blk_rs
->throttle_group
= g_strdup(throttling_group
);
545 blk_rs
->throttle_state
= throttle_group_incref(throttling_group
);
546 blk_rs
->throttle_state
->cfg
= cfg
;
551 if (file
&& !*file
) {
555 blk
= blk_new_open(qemu_opts_id(opts
), file
, NULL
, bs_opts
, bdrv_flags
,
562 bs
->detect_zeroes
= detect_zeroes
;
564 /* disk I/O throttling */
565 if (throttle_enabled(&cfg
)) {
566 if (!throttling_group
) {
567 throttling_group
= blk_name(blk
);
569 bdrv_io_limits_enable(bs
, throttling_group
);
570 bdrv_set_io_limits(bs
, &cfg
);
573 if (bdrv_key_required(bs
)) {
578 blk_set_on_error(blk
, on_read_error
, on_write_error
);
591 static QemuOptsList qemu_root_bds_opts
;
593 /* Takes the ownership of bs_opts */
594 static BlockDriverState
*bds_tree_init(QDict
*bs_opts
, Error
**errp
)
596 BlockDriverState
*bs
;
598 Error
*local_error
= NULL
;
599 BlockdevDetectZeroesOptions detect_zeroes
;
603 opts
= qemu_opts_create(&qemu_root_bds_opts
, NULL
, 1, errp
);
608 qemu_opts_absorb_qdict(opts
, bs_opts
, &local_error
);
610 error_propagate(errp
, local_error
);
614 extract_common_blockdev_options(opts
, &bdrv_flags
, NULL
, NULL
,
615 &detect_zeroes
, &local_error
);
617 error_propagate(errp
, local_error
);
622 ret
= bdrv_open(&bs
, NULL
, NULL
, bs_opts
, bdrv_flags
, errp
);
624 goto fail_no_bs_opts
;
627 bs
->detect_zeroes
= detect_zeroes
;
639 static void qemu_opt_rename(QemuOpts
*opts
, const char *from
, const char *to
,
644 value
= qemu_opt_get(opts
, from
);
646 if (qemu_opt_find(opts
, to
)) {
647 error_setg(errp
, "'%s' and its alias '%s' can't be used at the "
648 "same time", to
, from
);
653 /* rename all items in opts */
654 while ((value
= qemu_opt_get(opts
, from
))) {
655 qemu_opt_set(opts
, to
, value
, &error_abort
);
656 qemu_opt_unset(opts
, from
);
660 QemuOptsList qemu_legacy_drive_opts
= {
662 .head
= QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts
.head
),
666 .type
= QEMU_OPT_NUMBER
,
667 .help
= "bus number",
670 .type
= QEMU_OPT_NUMBER
,
671 .help
= "unit number (i.e. lun for scsi)",
674 .type
= QEMU_OPT_NUMBER
,
675 .help
= "index number",
678 .type
= QEMU_OPT_STRING
,
679 .help
= "media type (disk, cdrom)",
682 .type
= QEMU_OPT_STRING
,
683 .help
= "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
686 .type
= QEMU_OPT_NUMBER
,
687 .help
= "number of cylinders (ide disk geometry)",
690 .type
= QEMU_OPT_NUMBER
,
691 .help
= "number of heads (ide disk geometry)",
694 .type
= QEMU_OPT_NUMBER
,
695 .help
= "number of sectors (ide disk geometry)",
698 .type
= QEMU_OPT_STRING
,
699 .help
= "chs translation (auto, lba, none)",
702 .type
= QEMU_OPT_BOOL
,
703 .help
= "(deprecated, ignored)",
706 .type
= QEMU_OPT_STRING
,
707 .help
= "pci address (virtio only)",
710 .type
= QEMU_OPT_STRING
,
711 .help
= "disk serial number",
714 .type
= QEMU_OPT_STRING
,
718 /* Options that are passed on, but have special semantics with -drive */
721 .type
= QEMU_OPT_BOOL
,
722 .help
= "open drive file as read-only",
725 .type
= QEMU_OPT_STRING
,
726 .help
= "read error action",
729 .type
= QEMU_OPT_STRING
,
730 .help
= "write error action",
732 .name
= "copy-on-read",
733 .type
= QEMU_OPT_BOOL
,
734 .help
= "copy read data from backing file into image file",
737 { /* end of list */ }
741 DriveInfo
*drive_new(QemuOpts
*all_opts
, BlockInterfaceType block_default_type
)
745 DriveInfo
*dinfo
= NULL
;
747 QemuOpts
*legacy_opts
;
748 DriveMediaType media
= MEDIA_DISK
;
749 BlockInterfaceType type
;
750 int cyls
, heads
, secs
, translation
;
751 int max_devs
, bus_id
, unit_id
, index
;
753 const char *werror
, *rerror
;
754 bool read_only
= false;
757 const char *filename
;
758 Error
*local_err
= NULL
;
761 /* Change legacy command line options into QMP ones */
762 static const struct {
766 { "iops", "throttling.iops-total" },
767 { "iops_rd", "throttling.iops-read" },
768 { "iops_wr", "throttling.iops-write" },
770 { "bps", "throttling.bps-total" },
771 { "bps_rd", "throttling.bps-read" },
772 { "bps_wr", "throttling.bps-write" },
774 { "iops_max", "throttling.iops-total-max" },
775 { "iops_rd_max", "throttling.iops-read-max" },
776 { "iops_wr_max", "throttling.iops-write-max" },
778 { "bps_max", "throttling.bps-total-max" },
779 { "bps_rd_max", "throttling.bps-read-max" },
780 { "bps_wr_max", "throttling.bps-write-max" },
782 { "iops_size", "throttling.iops-size" },
784 { "group", "throttling.group" },
786 { "readonly", "read-only" },
789 for (i
= 0; i
< ARRAY_SIZE(opt_renames
); i
++) {
790 qemu_opt_rename(all_opts
, opt_renames
[i
].from
, opt_renames
[i
].to
,
793 error_report_err(local_err
);
798 value
= qemu_opt_get(all_opts
, "cache");
802 if (bdrv_parse_cache_flags(value
, &flags
) != 0) {
803 error_report("invalid cache option");
807 /* Specific options take precedence */
808 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_WB
)) {
809 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_WB
,
810 !!(flags
& BDRV_O_CACHE_WB
), &error_abort
);
812 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_DIRECT
)) {
813 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_DIRECT
,
814 !!(flags
& BDRV_O_NOCACHE
), &error_abort
);
816 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_NO_FLUSH
)) {
817 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_NO_FLUSH
,
818 !!(flags
& BDRV_O_NO_FLUSH
), &error_abort
);
820 qemu_opt_unset(all_opts
, "cache");
823 /* Get a QDict for processing the options */
824 bs_opts
= qdict_new();
825 qemu_opts_to_qdict(all_opts
, bs_opts
);
827 legacy_opts
= qemu_opts_create(&qemu_legacy_drive_opts
, NULL
, 0,
829 qemu_opts_absorb_qdict(legacy_opts
, bs_opts
, &local_err
);
831 error_report_err(local_err
);
835 /* Deprecated option boot=[on|off] */
836 if (qemu_opt_get(legacy_opts
, "boot") != NULL
) {
837 fprintf(stderr
, "qemu-kvm: boot=on|off is deprecated and will be "
838 "ignored. Future versions will reject this parameter. Please "
839 "update your scripts.\n");
843 value
= qemu_opt_get(legacy_opts
, "media");
845 if (!strcmp(value
, "disk")) {
847 } else if (!strcmp(value
, "cdrom")) {
851 error_report("'%s' invalid media", value
);
856 /* copy-on-read is disabled with a warning for read-only devices */
857 read_only
|= qemu_opt_get_bool(legacy_opts
, "read-only", false);
858 copy_on_read
= qemu_opt_get_bool(legacy_opts
, "copy-on-read", false);
860 if (read_only
&& copy_on_read
) {
861 error_report("warning: disabling copy-on-read on read-only drive");
862 copy_on_read
= false;
865 qdict_put(bs_opts
, "read-only",
866 qstring_from_str(read_only
? "on" : "off"));
867 qdict_put(bs_opts
, "copy-on-read",
868 qstring_from_str(copy_on_read
? "on" :"off"));
870 /* Controller type */
871 value
= qemu_opt_get(legacy_opts
, "if");
874 type
< IF_COUNT
&& strcmp(value
, if_name
[type
]);
877 if (type
== IF_COUNT
) {
878 error_report("unsupported bus type '%s'", value
);
882 type
= block_default_type
;
886 cyls
= qemu_opt_get_number(legacy_opts
, "cyls", 0);
887 heads
= qemu_opt_get_number(legacy_opts
, "heads", 0);
888 secs
= qemu_opt_get_number(legacy_opts
, "secs", 0);
890 if (cyls
|| heads
|| secs
) {
892 error_report("invalid physical cyls number");
896 error_report("invalid physical heads number");
900 error_report("invalid physical secs number");
905 translation
= BIOS_ATA_TRANSLATION_AUTO
;
906 value
= qemu_opt_get(legacy_opts
, "trans");
909 error_report("'%s' trans must be used with cyls, heads and secs",
913 if (!strcmp(value
, "none")) {
914 translation
= BIOS_ATA_TRANSLATION_NONE
;
915 } else if (!strcmp(value
, "lba")) {
916 translation
= BIOS_ATA_TRANSLATION_LBA
;
917 } else if (!strcmp(value
, "large")) {
918 translation
= BIOS_ATA_TRANSLATION_LARGE
;
919 } else if (!strcmp(value
, "rechs")) {
920 translation
= BIOS_ATA_TRANSLATION_RECHS
;
921 } else if (!strcmp(value
, "auto")) {
922 translation
= BIOS_ATA_TRANSLATION_AUTO
;
924 error_report("'%s' invalid translation type", value
);
929 if (media
== MEDIA_CDROM
) {
930 if (cyls
|| secs
|| heads
) {
931 error_report("CHS can't be set with media=cdrom");
936 /* Device address specified by bus/unit or index.
937 * If none was specified, try to find the first free one. */
938 bus_id
= qemu_opt_get_number(legacy_opts
, "bus", 0);
939 unit_id
= qemu_opt_get_number(legacy_opts
, "unit", -1);
940 index
= qemu_opt_get_number(legacy_opts
, "index", -1);
942 max_devs
= if_max_devs
[type
];
945 if (bus_id
!= 0 || unit_id
!= -1) {
946 error_report("index cannot be used with bus and unit");
949 bus_id
= drive_index_to_bus_id(type
, index
);
950 unit_id
= drive_index_to_unit_id(type
, index
);
955 while (drive_get(type
, bus_id
, unit_id
) != NULL
) {
957 if (max_devs
&& unit_id
>= max_devs
) {
964 if (max_devs
&& unit_id
>= max_devs
) {
965 error_report("unit %d too big (max is %d)", unit_id
, max_devs
- 1);
969 if (drive_get(type
, bus_id
, unit_id
) != NULL
) {
970 error_report("drive with bus=%d, unit=%d (index=%d) exists",
971 bus_id
, unit_id
, index
);
976 serial
= qemu_opt_get(legacy_opts
, "serial");
978 /* no id supplied -> create one */
979 if (qemu_opts_id(all_opts
) == NULL
) {
981 const char *mediastr
= "";
982 if (type
== IF_IDE
|| type
== IF_SCSI
) {
983 mediastr
= (media
== MEDIA_CDROM
) ? "-cd" : "-hd";
986 new_id
= g_strdup_printf("%s%i%s%i", if_name
[type
], bus_id
,
989 new_id
= g_strdup_printf("%s%s%i", if_name
[type
],
992 qdict_put(bs_opts
, "id", qstring_from_str(new_id
));
996 /* Add virtio block device */
997 devaddr
= qemu_opt_get(legacy_opts
, "addr");
998 if (devaddr
&& type
!= IF_VIRTIO
) {
999 error_report("addr is not supported by this bus type");
1003 if (type
== IF_VIRTIO
) {
1005 devopts
= qemu_opts_create(qemu_find_opts("device"), NULL
, 0,
1007 if (arch_type
== QEMU_ARCH_S390X
) {
1008 qemu_opt_set(devopts
, "driver", "virtio-blk-ccw", &error_abort
);
1010 qemu_opt_set(devopts
, "driver", "virtio-blk-pci", &error_abort
);
1012 qemu_opt_set(devopts
, "drive", qdict_get_str(bs_opts
, "id"),
1015 qemu_opt_set(devopts
, "addr", devaddr
, &error_abort
);
1019 filename
= qemu_opt_get(legacy_opts
, "file");
1021 /* Check werror/rerror compatibility with if=... */
1022 werror
= qemu_opt_get(legacy_opts
, "werror");
1023 if (werror
!= NULL
) {
1024 if (type
!= IF_IDE
&& type
!= IF_SCSI
&& type
!= IF_VIRTIO
&&
1026 error_report("werror is not supported by this bus type");
1029 qdict_put(bs_opts
, "werror", qstring_from_str(werror
));
1032 rerror
= qemu_opt_get(legacy_opts
, "rerror");
1033 if (rerror
!= NULL
) {
1034 if (type
!= IF_IDE
&& type
!= IF_VIRTIO
&& type
!= IF_SCSI
&&
1036 error_report("rerror is not supported by this bus type");
1039 qdict_put(bs_opts
, "rerror", qstring_from_str(rerror
));
1042 /* Actual block device init: Functionality shared with blockdev-add */
1043 blk
= blockdev_init(filename
, bs_opts
, &local_err
);
1047 error_report_err(local_err
);
1054 /* Create legacy DriveInfo */
1055 dinfo
= g_malloc0(sizeof(*dinfo
));
1056 dinfo
->opts
= all_opts
;
1059 dinfo
->heads
= heads
;
1061 dinfo
->trans
= translation
;
1064 dinfo
->bus
= bus_id
;
1065 dinfo
->unit
= unit_id
;
1066 dinfo
->devaddr
= devaddr
;
1067 dinfo
->serial
= g_strdup(serial
);
1069 blk_set_legacy_dinfo(blk
, dinfo
);
1076 dinfo
->media_cd
= media
== MEDIA_CDROM
;
1083 qemu_opts_del(legacy_opts
);
1088 void hmp_commit(Monitor
*mon
, const QDict
*qdict
)
1090 const char *device
= qdict_get_str(qdict
, "device");
1094 if (!strcmp(device
, "all")) {
1095 ret
= bdrv_commit_all();
1097 BlockDriverState
*bs
;
1098 AioContext
*aio_context
;
1100 blk
= blk_by_name(device
);
1102 monitor_printf(mon
, "Device '%s' not found\n", device
);
1105 if (!blk_is_available(blk
)) {
1106 monitor_printf(mon
, "Device '%s' has no medium\n", device
);
1111 aio_context
= bdrv_get_aio_context(bs
);
1112 aio_context_acquire(aio_context
);
1114 ret
= bdrv_commit(bs
);
1116 aio_context_release(aio_context
);
1119 monitor_printf(mon
, "'commit' error for '%s': %s\n", device
,
1124 static void blockdev_do_action(TransactionActionKind type
, void *data
,
1127 TransactionAction action
;
1128 TransactionActionList list
;
1131 action
.u
.data
= data
;
1132 list
.value
= &action
;
1134 qmp_transaction(&list
, errp
);
1137 void qmp_blockdev_snapshot_sync(bool has_device
, const char *device
,
1138 bool has_node_name
, const char *node_name
,
1139 const char *snapshot_file
,
1140 bool has_snapshot_node_name
,
1141 const char *snapshot_node_name
,
1142 bool has_format
, const char *format
,
1143 bool has_mode
, NewImageMode mode
, Error
**errp
)
1145 BlockdevSnapshotSync snapshot
= {
1146 .has_device
= has_device
,
1147 .device
= (char *) device
,
1148 .has_node_name
= has_node_name
,
1149 .node_name
= (char *) node_name
,
1150 .snapshot_file
= (char *) snapshot_file
,
1151 .has_snapshot_node_name
= has_snapshot_node_name
,
1152 .snapshot_node_name
= (char *) snapshot_node_name
,
1153 .has_format
= has_format
,
1154 .format
= (char *) format
,
1155 .has_mode
= has_mode
,
1158 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
,
1162 void qmp_blockdev_snapshot(const char *node
, const char *overlay
,
1165 BlockdevSnapshot snapshot_data
= {
1166 .node
= (char *) node
,
1167 .overlay
= (char *) overlay
1170 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT
,
1171 &snapshot_data
, errp
);
1174 void qmp_blockdev_snapshot_internal_sync(const char *device
,
1178 BlockdevSnapshotInternal snapshot
= {
1179 .device
= (char *) device
,
1180 .name
= (char *) name
1183 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
,
1187 SnapshotInfo
*qmp_blockdev_snapshot_delete_internal_sync(const char *device
,
1194 BlockDriverState
*bs
;
1196 AioContext
*aio_context
;
1197 QEMUSnapshotInfo sn
;
1198 Error
*local_err
= NULL
;
1199 SnapshotInfo
*info
= NULL
;
1202 blk
= blk_by_name(device
);
1204 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1205 "Device '%s' not found", device
);
1209 aio_context
= blk_get_aio_context(blk
);
1210 aio_context_acquire(aio_context
);
1221 error_setg(errp
, "Name or id must be provided");
1222 goto out_aio_context
;
1225 if (!blk_is_available(blk
)) {
1226 error_setg(errp
, "Device '%s' has no medium", device
);
1227 goto out_aio_context
;
1231 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE
, errp
)) {
1232 goto out_aio_context
;
1235 ret
= bdrv_snapshot_find_by_id_and_name(bs
, id
, name
, &sn
, &local_err
);
1237 error_propagate(errp
, local_err
);
1238 goto out_aio_context
;
1242 "Snapshot with id '%s' and name '%s' does not exist on "
1244 STR_OR_NULL(id
), STR_OR_NULL(name
), device
);
1245 goto out_aio_context
;
1248 bdrv_snapshot_delete(bs
, id
, name
, &local_err
);
1250 error_propagate(errp
, local_err
);
1251 goto out_aio_context
;
1254 aio_context_release(aio_context
);
1256 info
= g_new0(SnapshotInfo
, 1);
1257 info
->id
= g_strdup(sn
.id_str
);
1258 info
->name
= g_strdup(sn
.name
);
1259 info
->date_nsec
= sn
.date_nsec
;
1260 info
->date_sec
= sn
.date_sec
;
1261 info
->vm_state_size
= sn
.vm_state_size
;
1262 info
->vm_clock_nsec
= sn
.vm_clock_nsec
% 1000000000;
1263 info
->vm_clock_sec
= sn
.vm_clock_nsec
/ 1000000000;
1268 aio_context_release(aio_context
);
1273 * block_dirty_bitmap_lookup:
1274 * Return a dirty bitmap (if present), after validating
1275 * the node reference and bitmap names.
1277 * @node: The name of the BDS node to search for bitmaps
1278 * @name: The name of the bitmap to search for
1279 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1280 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1281 * @errp: Output pointer for error information. Can be NULL.
1283 * @return: A bitmap object on success, or NULL on failure.
1285 static BdrvDirtyBitmap
*block_dirty_bitmap_lookup(const char *node
,
1287 BlockDriverState
**pbs
,
1291 BlockDriverState
*bs
;
1292 BdrvDirtyBitmap
*bitmap
;
1293 AioContext
*aio_context
;
1296 error_setg(errp
, "Node cannot be NULL");
1300 error_setg(errp
, "Bitmap name cannot be NULL");
1303 bs
= bdrv_lookup_bs(node
, node
, NULL
);
1305 error_setg(errp
, "Node '%s' not found", node
);
1309 aio_context
= bdrv_get_aio_context(bs
);
1310 aio_context_acquire(aio_context
);
1312 bitmap
= bdrv_find_dirty_bitmap(bs
, name
);
1314 error_setg(errp
, "Dirty bitmap '%s' not found", name
);
1322 *paio
= aio_context
;
1324 aio_context_release(aio_context
);
1330 aio_context_release(aio_context
);
1334 /* New and old BlockDriverState structs for atomic group operations */
1336 typedef struct BlkActionState BlkActionState
;
1340 * Table of operations that define an Action.
1342 * @instance_size: Size of state struct, in bytes.
1343 * @prepare: Prepare the work, must NOT be NULL.
1344 * @commit: Commit the changes, can be NULL.
1345 * @abort: Abort the changes on fail, can be NULL.
1346 * @clean: Clean up resources after all transaction actions have called
1347 * commit() or abort(). Can be NULL.
1349 * Only prepare() may fail. In a single transaction, only one of commit() or
1350 * abort() will be called. clean() will always be called if it is present.
1352 typedef struct BlkActionOps
{
1353 size_t instance_size
;
1354 void (*prepare
)(BlkActionState
*common
, Error
**errp
);
1355 void (*commit
)(BlkActionState
*common
);
1356 void (*abort
)(BlkActionState
*common
);
1357 void (*clean
)(BlkActionState
*common
);
1362 * Describes one Action's state within a Transaction.
1364 * @action: QAPI-defined enum identifying which Action to perform.
1365 * @ops: Table of ActionOps this Action can perform.
1366 * @entry: List membership for all Actions in this Transaction.
1368 * This structure must be arranged as first member in a subclassed type,
1369 * assuming that the compiler will also arrange it to the same offsets as the
1372 struct BlkActionState
{
1373 TransactionAction
*action
;
1374 const BlkActionOps
*ops
;
1375 QSIMPLEQ_ENTRY(BlkActionState
) entry
;
1378 /* internal snapshot private data */
1379 typedef struct InternalSnapshotState
{
1380 BlkActionState common
;
1381 BlockDriverState
*bs
;
1382 AioContext
*aio_context
;
1383 QEMUSnapshotInfo sn
;
1385 } InternalSnapshotState
;
1387 static void internal_snapshot_prepare(BlkActionState
*common
,
1390 Error
*local_err
= NULL
;
1394 BlockDriverState
*bs
;
1395 QEMUSnapshotInfo old_sn
, *sn
;
1398 BlockdevSnapshotInternal
*internal
;
1399 InternalSnapshotState
*state
;
1402 g_assert(common
->action
->type
==
1403 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
);
1404 internal
= common
->action
->u
.blockdev_snapshot_internal_sync
;
1405 state
= DO_UPCAST(InternalSnapshotState
, common
, common
);
1407 /* 1. parse input */
1408 device
= internal
->device
;
1409 name
= internal
->name
;
1411 /* 2. check for validation */
1412 blk
= blk_by_name(device
);
1414 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1415 "Device '%s' not found", device
);
1419 /* AioContext is released in .clean() */
1420 state
->aio_context
= blk_get_aio_context(blk
);
1421 aio_context_acquire(state
->aio_context
);
1423 if (!blk_is_available(blk
)) {
1424 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1430 bdrv_drained_begin(bs
);
1432 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT
, errp
)) {
1436 if (bdrv_is_read_only(bs
)) {
1437 error_setg(errp
, "Device '%s' is read only", device
);
1441 if (!bdrv_can_snapshot(bs
)) {
1442 error_setg(errp
, "Block format '%s' used by device '%s' "
1443 "does not support internal snapshots",
1444 bs
->drv
->format_name
, device
);
1448 if (!strlen(name
)) {
1449 error_setg(errp
, "Name is empty");
1453 /* check whether a snapshot with name exist */
1454 ret
= bdrv_snapshot_find_by_id_and_name(bs
, NULL
, name
, &old_sn
,
1457 error_propagate(errp
, local_err
);
1461 "Snapshot with name '%s' already exists on device '%s'",
1466 /* 3. take the snapshot */
1468 pstrcpy(sn
->name
, sizeof(sn
->name
), name
);
1469 qemu_gettimeofday(&tv
);
1470 sn
->date_sec
= tv
.tv_sec
;
1471 sn
->date_nsec
= tv
.tv_usec
* 1000;
1472 sn
->vm_clock_nsec
= qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
);
1474 ret1
= bdrv_snapshot_create(bs
, sn
);
1476 error_setg_errno(errp
, -ret1
,
1477 "Failed to create snapshot '%s' on device '%s'",
1482 /* 4. succeed, mark a snapshot is created */
1483 state
->created
= true;
1486 static void internal_snapshot_abort(BlkActionState
*common
)
1488 InternalSnapshotState
*state
=
1489 DO_UPCAST(InternalSnapshotState
, common
, common
);
1490 BlockDriverState
*bs
= state
->bs
;
1491 QEMUSnapshotInfo
*sn
= &state
->sn
;
1492 Error
*local_error
= NULL
;
1494 if (!state
->created
) {
1498 if (bdrv_snapshot_delete(bs
, sn
->id_str
, sn
->name
, &local_error
) < 0) {
1499 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1500 "device '%s' in abort: %s",
1503 bdrv_get_device_name(bs
),
1504 error_get_pretty(local_error
));
1505 error_free(local_error
);
1509 static void internal_snapshot_clean(BlkActionState
*common
)
1511 InternalSnapshotState
*state
= DO_UPCAST(InternalSnapshotState
,
1514 if (state
->aio_context
) {
1516 bdrv_drained_end(state
->bs
);
1518 aio_context_release(state
->aio_context
);
1522 /* external snapshot private data */
1523 typedef struct ExternalSnapshotState
{
1524 BlkActionState common
;
1525 BlockDriverState
*old_bs
;
1526 BlockDriverState
*new_bs
;
1527 AioContext
*aio_context
;
1528 } ExternalSnapshotState
;
1530 static void external_snapshot_prepare(BlkActionState
*common
,
1534 QDict
*options
= NULL
;
1535 Error
*local_err
= NULL
;
1536 /* Device and node name of the image to generate the snapshot from */
1538 const char *node_name
;
1539 /* Reference to the new image (for 'blockdev-snapshot') */
1540 const char *snapshot_ref
;
1541 /* File name of the new image (for 'blockdev-snapshot-sync') */
1542 const char *new_image_file
;
1543 ExternalSnapshotState
*state
=
1544 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1545 TransactionAction
*action
= common
->action
;
1547 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1548 * purpose but a different set of parameters */
1549 switch (action
->type
) {
1550 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT
:
1552 BlockdevSnapshot
*s
= action
->u
.blockdev_snapshot
;
1554 node_name
= s
->node
;
1555 new_image_file
= NULL
;
1556 snapshot_ref
= s
->overlay
;
1559 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
:
1561 BlockdevSnapshotSync
*s
= action
->u
.blockdev_snapshot_sync
;
1562 device
= s
->has_device
? s
->device
: NULL
;
1563 node_name
= s
->has_node_name
? s
->node_name
: NULL
;
1564 new_image_file
= s
->snapshot_file
;
1565 snapshot_ref
= NULL
;
1569 g_assert_not_reached();
1572 /* start processing */
1573 state
->old_bs
= bdrv_lookup_bs(device
, node_name
, errp
);
1574 if (!state
->old_bs
) {
1578 /* Acquire AioContext now so any threads operating on old_bs stop */
1579 state
->aio_context
= bdrv_get_aio_context(state
->old_bs
);
1580 aio_context_acquire(state
->aio_context
);
1581 bdrv_drained_begin(state
->old_bs
);
1583 if (!bdrv_is_inserted(state
->old_bs
)) {
1584 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1588 if (bdrv_op_is_blocked(state
->old_bs
,
1589 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
, errp
)) {
1593 if (!bdrv_is_read_only(state
->old_bs
)) {
1594 if (bdrv_flush(state
->old_bs
)) {
1595 error_setg(errp
, QERR_IO_ERROR
);
1600 if (!bdrv_is_first_non_filter(state
->old_bs
)) {
1601 error_setg(errp
, QERR_FEATURE_DISABLED
, "snapshot");
1605 if (action
->type
== TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
) {
1606 BlockdevSnapshotSync
*s
= action
->u
.blockdev_snapshot_sync
;
1607 const char *format
= s
->has_format
? s
->format
: "qcow2";
1608 enum NewImageMode mode
;
1609 const char *snapshot_node_name
=
1610 s
->has_snapshot_node_name
? s
->snapshot_node_name
: NULL
;
1612 if (node_name
&& !snapshot_node_name
) {
1613 error_setg(errp
, "New snapshot node name missing");
1617 if (snapshot_node_name
&&
1618 bdrv_lookup_bs(snapshot_node_name
, snapshot_node_name
, NULL
)) {
1619 error_setg(errp
, "New snapshot node name already in use");
1623 flags
= state
->old_bs
->open_flags
;
1625 /* create new image w/backing file */
1626 mode
= s
->has_mode
? s
->mode
: NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
1627 if (mode
!= NEW_IMAGE_MODE_EXISTING
) {
1628 bdrv_img_create(new_image_file
, format
,
1629 state
->old_bs
->filename
,
1630 state
->old_bs
->drv
->format_name
,
1631 NULL
, -1, flags
, &local_err
, false);
1633 error_propagate(errp
, local_err
);
1638 options
= qdict_new();
1639 if (s
->has_snapshot_node_name
) {
1640 qdict_put(options
, "node-name",
1641 qstring_from_str(snapshot_node_name
));
1643 qdict_put(options
, "driver", qstring_from_str(format
));
1645 flags
|= BDRV_O_NO_BACKING
;
1648 assert(state
->new_bs
== NULL
);
1649 ret
= bdrv_open(&state
->new_bs
, new_image_file
, snapshot_ref
, options
,
1651 /* We will manually add the backing_hd field to the bs later */
1656 if (state
->new_bs
->blk
!= NULL
) {
1657 error_setg(errp
, "The snapshot is already in use by %s",
1658 blk_name(state
->new_bs
->blk
));
1662 if (bdrv_op_is_blocked(state
->new_bs
, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
,
1667 if (state
->new_bs
->backing
!= NULL
) {
1668 error_setg(errp
, "The snapshot already has a backing image");
1672 if (!state
->new_bs
->drv
->supports_backing
) {
1673 error_setg(errp
, "The snapshot does not support backing images");
1677 static void external_snapshot_commit(BlkActionState
*common
)
1679 ExternalSnapshotState
*state
=
1680 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1682 bdrv_set_aio_context(state
->new_bs
, state
->aio_context
);
1684 /* This removes our old bs and adds the new bs */
1685 bdrv_append(state
->new_bs
, state
->old_bs
);
1686 /* We don't need (or want) to use the transactional
1687 * bdrv_reopen_multiple() across all the entries at once, because we
1688 * don't want to abort all of them if one of them fails the reopen */
1689 bdrv_reopen(state
->old_bs
, state
->old_bs
->open_flags
& ~BDRV_O_RDWR
,
1693 static void external_snapshot_abort(BlkActionState
*common
)
1695 ExternalSnapshotState
*state
=
1696 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1697 if (state
->new_bs
) {
1698 bdrv_unref(state
->new_bs
);
1702 static void external_snapshot_clean(BlkActionState
*common
)
1704 ExternalSnapshotState
*state
=
1705 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1706 if (state
->aio_context
) {
1707 bdrv_drained_end(state
->old_bs
);
1708 aio_context_release(state
->aio_context
);
1712 typedef struct DriveBackupState
{
1713 BlkActionState common
;
1714 BlockDriverState
*bs
;
1715 AioContext
*aio_context
;
1719 static void drive_backup_prepare(BlkActionState
*common
, Error
**errp
)
1721 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1723 DriveBackup
*backup
;
1724 Error
*local_err
= NULL
;
1726 assert(common
->action
->type
== TRANSACTION_ACTION_KIND_DRIVE_BACKUP
);
1727 backup
= common
->action
->u
.drive_backup
;
1729 blk
= blk_by_name(backup
->device
);
1731 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1732 "Device '%s' not found", backup
->device
);
1736 if (!blk_is_available(blk
)) {
1737 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, backup
->device
);
1741 /* AioContext is released in .clean() */
1742 state
->aio_context
= blk_get_aio_context(blk
);
1743 aio_context_acquire(state
->aio_context
);
1744 bdrv_drained_begin(blk_bs(blk
));
1745 state
->bs
= blk_bs(blk
);
1747 qmp_drive_backup(backup
->device
, backup
->target
,
1748 backup
->has_format
, backup
->format
,
1750 backup
->has_mode
, backup
->mode
,
1751 backup
->has_speed
, backup
->speed
,
1752 backup
->has_bitmap
, backup
->bitmap
,
1753 backup
->has_on_source_error
, backup
->on_source_error
,
1754 backup
->has_on_target_error
, backup
->on_target_error
,
1757 error_propagate(errp
, local_err
);
1761 state
->job
= state
->bs
->job
;
1764 static void drive_backup_abort(BlkActionState
*common
)
1766 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1767 BlockDriverState
*bs
= state
->bs
;
1769 /* Only cancel if it's the job we started */
1770 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
1771 block_job_cancel_sync(bs
->job
);
1775 static void drive_backup_clean(BlkActionState
*common
)
1777 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1779 if (state
->aio_context
) {
1780 bdrv_drained_end(state
->bs
);
1781 aio_context_release(state
->aio_context
);
1785 typedef struct BlockdevBackupState
{
1786 BlkActionState common
;
1787 BlockDriverState
*bs
;
1789 AioContext
*aio_context
;
1790 } BlockdevBackupState
;
1792 static void blockdev_backup_prepare(BlkActionState
*common
, Error
**errp
)
1794 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1795 BlockdevBackup
*backup
;
1796 BlockBackend
*blk
, *target
;
1797 Error
*local_err
= NULL
;
1799 assert(common
->action
->type
== TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP
);
1800 backup
= common
->action
->u
.blockdev_backup
;
1802 blk
= blk_by_name(backup
->device
);
1804 error_setg(errp
, "Device '%s' not found", backup
->device
);
1808 if (!blk_is_available(blk
)) {
1809 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, backup
->device
);
1813 target
= blk_by_name(backup
->target
);
1815 error_setg(errp
, "Device '%s' not found", backup
->target
);
1819 /* AioContext is released in .clean() */
1820 state
->aio_context
= blk_get_aio_context(blk
);
1821 if (state
->aio_context
!= blk_get_aio_context(target
)) {
1822 state
->aio_context
= NULL
;
1823 error_setg(errp
, "Backup between two IO threads is not implemented");
1826 aio_context_acquire(state
->aio_context
);
1827 state
->bs
= blk_bs(blk
);
1828 bdrv_drained_begin(state
->bs
);
1830 qmp_blockdev_backup(backup
->device
, backup
->target
,
1832 backup
->has_speed
, backup
->speed
,
1833 backup
->has_on_source_error
, backup
->on_source_error
,
1834 backup
->has_on_target_error
, backup
->on_target_error
,
1837 error_propagate(errp
, local_err
);
1841 state
->job
= state
->bs
->job
;
1844 static void blockdev_backup_abort(BlkActionState
*common
)
1846 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1847 BlockDriverState
*bs
= state
->bs
;
1849 /* Only cancel if it's the job we started */
1850 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
1851 block_job_cancel_sync(bs
->job
);
1855 static void blockdev_backup_clean(BlkActionState
*common
)
1857 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1859 if (state
->aio_context
) {
1860 bdrv_drained_end(state
->bs
);
1861 aio_context_release(state
->aio_context
);
1865 typedef struct BlockDirtyBitmapState
{
1866 BlkActionState common
;
1867 BdrvDirtyBitmap
*bitmap
;
1868 BlockDriverState
*bs
;
1869 AioContext
*aio_context
;
1872 } BlockDirtyBitmapState
;
1874 static void block_dirty_bitmap_add_prepare(BlkActionState
*common
,
1877 Error
*local_err
= NULL
;
1878 BlockDirtyBitmapAdd
*action
;
1879 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
1882 action
= common
->action
->u
.block_dirty_bitmap_add
;
1883 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1884 qmp_block_dirty_bitmap_add(action
->node
, action
->name
,
1885 action
->has_granularity
, action
->granularity
,
1889 state
->prepared
= true;
1891 error_propagate(errp
, local_err
);
1895 static void block_dirty_bitmap_add_abort(BlkActionState
*common
)
1897 BlockDirtyBitmapAdd
*action
;
1898 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
1901 action
= common
->action
->u
.block_dirty_bitmap_add
;
1902 /* Should not be able to fail: IF the bitmap was added via .prepare(),
1903 * then the node reference and bitmap name must have been valid.
1905 if (state
->prepared
) {
1906 qmp_block_dirty_bitmap_remove(action
->node
, action
->name
, &error_abort
);
1910 static void block_dirty_bitmap_clear_prepare(BlkActionState
*common
,
1913 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
1915 BlockDirtyBitmap
*action
;
1917 action
= common
->action
->u
.block_dirty_bitmap_clear
;
1918 state
->bitmap
= block_dirty_bitmap_lookup(action
->node
,
1921 &state
->aio_context
,
1923 if (!state
->bitmap
) {
1927 if (bdrv_dirty_bitmap_frozen(state
->bitmap
)) {
1928 error_setg(errp
, "Cannot modify a frozen bitmap");
1930 } else if (!bdrv_dirty_bitmap_enabled(state
->bitmap
)) {
1931 error_setg(errp
, "Cannot clear a disabled bitmap");
1935 bdrv_clear_dirty_bitmap(state
->bitmap
, &state
->backup
);
1936 /* AioContext is released in .clean() */
1939 static void block_dirty_bitmap_clear_abort(BlkActionState
*common
)
1941 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
1944 bdrv_undo_clear_dirty_bitmap(state
->bitmap
, state
->backup
);
1947 static void block_dirty_bitmap_clear_commit(BlkActionState
*common
)
1949 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
1952 hbitmap_free(state
->backup
);
1955 static void block_dirty_bitmap_clear_clean(BlkActionState
*common
)
1957 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
1960 if (state
->aio_context
) {
1961 aio_context_release(state
->aio_context
);
1965 static void abort_prepare(BlkActionState
*common
, Error
**errp
)
1967 error_setg(errp
, "Transaction aborted using Abort action");
1970 static void abort_commit(BlkActionState
*common
)
1972 g_assert_not_reached(); /* this action never succeeds */
1975 static const BlkActionOps actions
[] = {
1976 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT
] = {
1977 .instance_size
= sizeof(ExternalSnapshotState
),
1978 .prepare
= external_snapshot_prepare
,
1979 .commit
= external_snapshot_commit
,
1980 .abort
= external_snapshot_abort
,
1982 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
] = {
1983 .instance_size
= sizeof(ExternalSnapshotState
),
1984 .prepare
= external_snapshot_prepare
,
1985 .commit
= external_snapshot_commit
,
1986 .abort
= external_snapshot_abort
,
1987 .clean
= external_snapshot_clean
,
1989 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP
] = {
1990 .instance_size
= sizeof(DriveBackupState
),
1991 .prepare
= drive_backup_prepare
,
1992 .abort
= drive_backup_abort
,
1993 .clean
= drive_backup_clean
,
1995 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP
] = {
1996 .instance_size
= sizeof(BlockdevBackupState
),
1997 .prepare
= blockdev_backup_prepare
,
1998 .abort
= blockdev_backup_abort
,
1999 .clean
= blockdev_backup_clean
,
2001 [TRANSACTION_ACTION_KIND_ABORT
] = {
2002 .instance_size
= sizeof(BlkActionState
),
2003 .prepare
= abort_prepare
,
2004 .commit
= abort_commit
,
2006 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
] = {
2007 .instance_size
= sizeof(InternalSnapshotState
),
2008 .prepare
= internal_snapshot_prepare
,
2009 .abort
= internal_snapshot_abort
,
2010 .clean
= internal_snapshot_clean
,
2012 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD
] = {
2013 .instance_size
= sizeof(BlockDirtyBitmapState
),
2014 .prepare
= block_dirty_bitmap_add_prepare
,
2015 .abort
= block_dirty_bitmap_add_abort
,
2017 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR
] = {
2018 .instance_size
= sizeof(BlockDirtyBitmapState
),
2019 .prepare
= block_dirty_bitmap_clear_prepare
,
2020 .commit
= block_dirty_bitmap_clear_commit
,
2021 .abort
= block_dirty_bitmap_clear_abort
,
2022 .clean
= block_dirty_bitmap_clear_clean
,
2027 * 'Atomic' group operations. The operations are performed as a set, and if
2028 * any fail then we roll back all operations in the group.
2030 void qmp_transaction(TransactionActionList
*dev_list
, Error
**errp
)
2032 TransactionActionList
*dev_entry
= dev_list
;
2033 BlkActionState
*state
, *next
;
2034 Error
*local_err
= NULL
;
2036 QSIMPLEQ_HEAD(snap_bdrv_states
, BlkActionState
) snap_bdrv_states
;
2037 QSIMPLEQ_INIT(&snap_bdrv_states
);
2039 /* drain all i/o before any operations */
2042 /* We don't do anything in this loop that commits us to the operations */
2043 while (NULL
!= dev_entry
) {
2044 TransactionAction
*dev_info
= NULL
;
2045 const BlkActionOps
*ops
;
2047 dev_info
= dev_entry
->value
;
2048 dev_entry
= dev_entry
->next
;
2050 assert(dev_info
->type
< ARRAY_SIZE(actions
));
2052 ops
= &actions
[dev_info
->type
];
2053 assert(ops
->instance_size
> 0);
2055 state
= g_malloc0(ops
->instance_size
);
2057 state
->action
= dev_info
;
2058 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states
, state
, entry
);
2060 state
->ops
->prepare(state
, &local_err
);
2062 error_propagate(errp
, local_err
);
2063 goto delete_and_fail
;
2067 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
2068 if (state
->ops
->commit
) {
2069 state
->ops
->commit(state
);
2077 /* failure, and it is all-or-none; roll back all operations */
2078 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
2079 if (state
->ops
->abort
) {
2080 state
->ops
->abort(state
);
2084 QSIMPLEQ_FOREACH_SAFE(state
, &snap_bdrv_states
, entry
, next
) {
2085 if (state
->ops
->clean
) {
2086 state
->ops
->clean(state
);
2092 void qmp_eject(const char *device
, bool has_force
, bool force
, Error
**errp
)
2094 Error
*local_err
= NULL
;
2096 qmp_blockdev_open_tray(device
, has_force
, force
, &local_err
);
2098 error_propagate(errp
, local_err
);
2102 qmp_blockdev_remove_medium(device
, errp
);
2105 void qmp_block_passwd(bool has_device
, const char *device
,
2106 bool has_node_name
, const char *node_name
,
2107 const char *password
, Error
**errp
)
2109 Error
*local_err
= NULL
;
2110 BlockDriverState
*bs
;
2111 AioContext
*aio_context
;
2113 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
2114 has_node_name
? node_name
: NULL
,
2117 error_propagate(errp
, local_err
);
2121 aio_context
= bdrv_get_aio_context(bs
);
2122 aio_context_acquire(aio_context
);
2124 bdrv_add_key(bs
, password
, errp
);
2126 aio_context_release(aio_context
);
2129 void qmp_blockdev_open_tray(const char *device
, bool has_force
, bool force
,
2139 blk
= blk_by_name(device
);
2141 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2142 "Device '%s' not found", device
);
2146 if (!blk_dev_has_removable_media(blk
)) {
2147 error_setg(errp
, "Device '%s' is not removable", device
);
2151 if (blk_dev_is_tray_open(blk
)) {
2155 locked
= blk_dev_is_medium_locked(blk
);
2157 blk_dev_eject_request(blk
, force
);
2160 if (!locked
|| force
) {
2161 blk_dev_change_media_cb(blk
, false);
2165 void qmp_blockdev_close_tray(const char *device
, Error
**errp
)
2169 blk
= blk_by_name(device
);
2171 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2172 "Device '%s' not found", device
);
2176 if (!blk_dev_has_removable_media(blk
)) {
2177 error_setg(errp
, "Device '%s' is not removable", device
);
2181 if (!blk_dev_is_tray_open(blk
)) {
2185 blk_dev_change_media_cb(blk
, true);
2188 void qmp_blockdev_remove_medium(const char *device
, Error
**errp
)
2191 BlockDriverState
*bs
;
2192 AioContext
*aio_context
;
2195 blk
= blk_by_name(device
);
2197 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2198 "Device '%s' not found", device
);
2202 /* For BBs without a device, we can exchange the BDS tree at will */
2203 has_device
= blk_get_attached_dev(blk
);
2205 if (has_device
&& !blk_dev_has_removable_media(blk
)) {
2206 error_setg(errp
, "Device '%s' is not removable", device
);
2210 if (has_device
&& !blk_dev_is_tray_open(blk
)) {
2211 error_setg(errp
, "Tray of device '%s' is not open", device
);
2220 aio_context
= bdrv_get_aio_context(bs
);
2221 aio_context_acquire(aio_context
);
2223 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_EJECT
, errp
)) {
2227 /* This follows the convention established by bdrv_make_anon() */
2228 if (bs
->device_list
.tqe_prev
) {
2229 QTAILQ_REMOVE(&bdrv_states
, bs
, device_list
);
2230 bs
->device_list
.tqe_prev
= NULL
;
2236 aio_context_release(aio_context
);
2239 static void qmp_blockdev_insert_anon_medium(const char *device
,
2240 BlockDriverState
*bs
, Error
**errp
)
2245 blk
= blk_by_name(device
);
2247 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2248 "Device '%s' not found", device
);
2252 /* For BBs without a device, we can exchange the BDS tree at will */
2253 has_device
= blk_get_attached_dev(blk
);
2255 if (has_device
&& !blk_dev_has_removable_media(blk
)) {
2256 error_setg(errp
, "Device '%s' is not removable", device
);
2260 if (has_device
&& !blk_dev_is_tray_open(blk
)) {
2261 error_setg(errp
, "Tray of device '%s' is not open", device
);
2266 error_setg(errp
, "There already is a medium in device '%s'", device
);
2270 blk_insert_bs(blk
, bs
);
2272 QTAILQ_INSERT_TAIL(&bdrv_states
, bs
, device_list
);
2275 void qmp_blockdev_insert_medium(const char *device
, const char *node_name
,
2278 BlockDriverState
*bs
;
2280 bs
= bdrv_find_node(node_name
);
2282 error_setg(errp
, "Node '%s' not found", node_name
);
2287 error_setg(errp
, "Node '%s' is already in use by '%s'", node_name
,
2292 qmp_blockdev_insert_anon_medium(device
, bs
, errp
);
2295 void qmp_blockdev_change_medium(const char *device
, const char *filename
,
2296 bool has_format
, const char *format
,
2298 BlockdevChangeReadOnlyMode read_only
,
2302 BlockDriverState
*medium_bs
= NULL
;
2303 int bdrv_flags
, ret
;
2304 QDict
*options
= NULL
;
2307 blk
= blk_by_name(device
);
2309 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2310 "Device '%s' not found", device
);
2315 blk_update_root_state(blk
);
2318 bdrv_flags
= blk_get_open_flags_from_root_state(blk
);
2320 if (!has_read_only
) {
2321 read_only
= BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN
;
2324 switch (read_only
) {
2325 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN
:
2328 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY
:
2329 bdrv_flags
&= ~BDRV_O_RDWR
;
2332 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE
:
2333 bdrv_flags
|= BDRV_O_RDWR
;
2341 options
= qdict_new();
2342 qdict_put(options
, "driver", qstring_from_str(format
));
2346 ret
= bdrv_open(&medium_bs
, filename
, NULL
, options
, bdrv_flags
, errp
);
2351 blk_apply_root_state(blk
, medium_bs
);
2353 bdrv_add_key(medium_bs
, NULL
, &err
);
2355 error_propagate(errp
, err
);
2359 qmp_blockdev_open_tray(device
, false, false, &err
);
2361 error_propagate(errp
, err
);
2365 qmp_blockdev_remove_medium(device
, &err
);
2367 error_propagate(errp
, err
);
2371 qmp_blockdev_insert_anon_medium(device
, medium_bs
, &err
);
2373 error_propagate(errp
, err
);
2377 qmp_blockdev_close_tray(device
, errp
);
2380 /* If the medium has been inserted, the device has its own reference, so
2381 * ours must be relinquished; and if it has not been inserted successfully,
2382 * the reference must be relinquished anyway */
2383 bdrv_unref(medium_bs
);
2386 /* throttling disk I/O limits */
2387 void qmp_block_set_io_throttle(const char *device
, int64_t bps
, int64_t bps_rd
,
2394 bool has_bps_rd_max
,
2396 bool has_bps_wr_max
,
2400 bool has_iops_rd_max
,
2401 int64_t iops_rd_max
,
2402 bool has_iops_wr_max
,
2403 int64_t iops_wr_max
,
2407 const char *group
, Error
**errp
)
2410 BlockDriverState
*bs
;
2412 AioContext
*aio_context
;
2414 blk
= blk_by_name(device
);
2416 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2417 "Device '%s' not found", device
);
2421 aio_context
= blk_get_aio_context(blk
);
2422 aio_context_acquire(aio_context
);
2426 error_setg(errp
, "Device '%s' has no medium", device
);
2430 memset(&cfg
, 0, sizeof(cfg
));
2431 cfg
.buckets
[THROTTLE_BPS_TOTAL
].avg
= bps
;
2432 cfg
.buckets
[THROTTLE_BPS_READ
].avg
= bps_rd
;
2433 cfg
.buckets
[THROTTLE_BPS_WRITE
].avg
= bps_wr
;
2435 cfg
.buckets
[THROTTLE_OPS_TOTAL
].avg
= iops
;
2436 cfg
.buckets
[THROTTLE_OPS_READ
].avg
= iops_rd
;
2437 cfg
.buckets
[THROTTLE_OPS_WRITE
].avg
= iops_wr
;
2440 cfg
.buckets
[THROTTLE_BPS_TOTAL
].max
= bps_max
;
2442 if (has_bps_rd_max
) {
2443 cfg
.buckets
[THROTTLE_BPS_READ
].max
= bps_rd_max
;
2445 if (has_bps_wr_max
) {
2446 cfg
.buckets
[THROTTLE_BPS_WRITE
].max
= bps_wr_max
;
2449 cfg
.buckets
[THROTTLE_OPS_TOTAL
].max
= iops_max
;
2451 if (has_iops_rd_max
) {
2452 cfg
.buckets
[THROTTLE_OPS_READ
].max
= iops_rd_max
;
2454 if (has_iops_wr_max
) {
2455 cfg
.buckets
[THROTTLE_OPS_WRITE
].max
= iops_wr_max
;
2458 if (has_iops_size
) {
2459 cfg
.op_size
= iops_size
;
2462 if (!check_throttle_config(&cfg
, errp
)) {
2466 if (throttle_enabled(&cfg
)) {
2467 /* Enable I/O limits if they're not enabled yet, otherwise
2468 * just update the throttling group. */
2469 if (!bs
->throttle_state
) {
2470 bdrv_io_limits_enable(bs
, has_group
? group
: device
);
2471 } else if (has_group
) {
2472 bdrv_io_limits_update_group(bs
, group
);
2474 /* Set the new throttling configuration */
2475 bdrv_set_io_limits(bs
, &cfg
);
2476 } else if (bs
->throttle_state
) {
2477 /* If all throttling settings are set to 0, disable I/O limits */
2478 bdrv_io_limits_disable(bs
);
2482 aio_context_release(aio_context
);
2485 void qmp_block_dirty_bitmap_add(const char *node
, const char *name
,
2486 bool has_granularity
, uint32_t granularity
,
2489 AioContext
*aio_context
;
2490 BlockDriverState
*bs
;
2492 if (!name
|| name
[0] == '\0') {
2493 error_setg(errp
, "Bitmap name cannot be empty");
2497 bs
= bdrv_lookup_bs(node
, node
, errp
);
2502 aio_context
= bdrv_get_aio_context(bs
);
2503 aio_context_acquire(aio_context
);
2505 if (has_granularity
) {
2506 if (granularity
< 512 || !is_power_of_2(granularity
)) {
2507 error_setg(errp
, "Granularity must be power of 2 "
2508 "and at least 512");
2512 /* Default to cluster size, if available: */
2513 granularity
= bdrv_get_default_bitmap_granularity(bs
);
2516 bdrv_create_dirty_bitmap(bs
, granularity
, name
, errp
);
2519 aio_context_release(aio_context
);
2522 void qmp_block_dirty_bitmap_remove(const char *node
, const char *name
,
2525 AioContext
*aio_context
;
2526 BlockDriverState
*bs
;
2527 BdrvDirtyBitmap
*bitmap
;
2529 bitmap
= block_dirty_bitmap_lookup(node
, name
, &bs
, &aio_context
, errp
);
2530 if (!bitmap
|| !bs
) {
2534 if (bdrv_dirty_bitmap_frozen(bitmap
)) {
2536 "Bitmap '%s' is currently frozen and cannot be removed",
2540 bdrv_dirty_bitmap_make_anon(bitmap
);
2541 bdrv_release_dirty_bitmap(bs
, bitmap
);
2544 aio_context_release(aio_context
);
2548 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2549 * immediately after a full backup operation.
2551 void qmp_block_dirty_bitmap_clear(const char *node
, const char *name
,
2554 AioContext
*aio_context
;
2555 BdrvDirtyBitmap
*bitmap
;
2556 BlockDriverState
*bs
;
2558 bitmap
= block_dirty_bitmap_lookup(node
, name
, &bs
, &aio_context
, errp
);
2559 if (!bitmap
|| !bs
) {
2563 if (bdrv_dirty_bitmap_frozen(bitmap
)) {
2565 "Bitmap '%s' is currently frozen and cannot be modified",
2568 } else if (!bdrv_dirty_bitmap_enabled(bitmap
)) {
2570 "Bitmap '%s' is currently disabled and cannot be cleared",
2575 bdrv_clear_dirty_bitmap(bitmap
, NULL
);
2578 aio_context_release(aio_context
);
2581 void hmp_drive_del(Monitor
*mon
, const QDict
*qdict
)
2583 const char *id
= qdict_get_str(qdict
, "id");
2585 BlockDriverState
*bs
;
2586 AioContext
*aio_context
;
2587 Error
*local_err
= NULL
;
2589 blk
= blk_by_name(id
);
2591 error_report("Device '%s' not found", id
);
2595 if (!blk_legacy_dinfo(blk
)) {
2596 error_report("Deleting device added with blockdev-add"
2597 " is not supported");
2601 aio_context
= blk_get_aio_context(blk
);
2602 aio_context_acquire(aio_context
);
2606 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_DRIVE_DEL
, &local_err
)) {
2607 error_report_err(local_err
);
2608 aio_context_release(aio_context
);
2615 /* if we have a device attached to this BlockDriverState
2616 * then we need to make the drive anonymous until the device
2617 * can be removed. If this is a drive with no device backing
2618 * then we can just get rid of the block driver state right here.
2620 if (blk_get_attached_dev(blk
)) {
2621 blk_hide_on_behalf_of_hmp_drive_del(blk
);
2622 /* Further I/O must not pause the guest */
2623 blk_set_on_error(blk
, BLOCKDEV_ON_ERROR_REPORT
,
2624 BLOCKDEV_ON_ERROR_REPORT
);
2629 aio_context_release(aio_context
);
2632 void qmp_block_resize(bool has_device
, const char *device
,
2633 bool has_node_name
, const char *node_name
,
2634 int64_t size
, Error
**errp
)
2636 Error
*local_err
= NULL
;
2637 BlockDriverState
*bs
;
2638 AioContext
*aio_context
;
2641 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
2642 has_node_name
? node_name
: NULL
,
2645 error_propagate(errp
, local_err
);
2649 aio_context
= bdrv_get_aio_context(bs
);
2650 aio_context_acquire(aio_context
);
2652 if (!bdrv_is_first_non_filter(bs
)) {
2653 error_setg(errp
, QERR_FEATURE_DISABLED
, "resize");
2658 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "size", "a >0 size");
2662 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_RESIZE
, NULL
)) {
2663 error_setg(errp
, QERR_DEVICE_IN_USE
, device
);
2667 /* complete all in-flight operations before resizing the device */
2670 ret
= bdrv_truncate(bs
, size
);
2675 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
2678 error_setg(errp
, QERR_UNSUPPORTED
);
2681 error_setg(errp
, "Device '%s' is read only", device
);
2684 error_setg(errp
, QERR_DEVICE_IN_USE
, device
);
2687 error_setg_errno(errp
, -ret
, "Could not resize");
2692 aio_context_release(aio_context
);
2695 static void block_job_cb(void *opaque
, int ret
)
2697 /* Note that this function may be executed from another AioContext besides
2698 * the QEMU main loop. If you need to access anything that assumes the
2699 * QEMU global mutex, use a BH or introduce a mutex.
2702 BlockDriverState
*bs
= opaque
;
2703 const char *msg
= NULL
;
2705 trace_block_job_cb(bs
, bs
->job
, ret
);
2710 msg
= strerror(-ret
);
2713 if (block_job_is_cancelled(bs
->job
)) {
2714 block_job_event_cancelled(bs
->job
);
2716 block_job_event_completed(bs
->job
, msg
);
2720 void qmp_block_stream(const char *device
,
2721 bool has_base
, const char *base
,
2722 bool has_backing_file
, const char *backing_file
,
2723 bool has_speed
, int64_t speed
,
2724 bool has_on_error
, BlockdevOnError on_error
,
2728 BlockDriverState
*bs
;
2729 BlockDriverState
*base_bs
= NULL
;
2730 AioContext
*aio_context
;
2731 Error
*local_err
= NULL
;
2732 const char *base_name
= NULL
;
2734 if (!has_on_error
) {
2735 on_error
= BLOCKDEV_ON_ERROR_REPORT
;
2738 blk
= blk_by_name(device
);
2740 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2741 "Device '%s' not found", device
);
2745 aio_context
= blk_get_aio_context(blk
);
2746 aio_context_acquire(aio_context
);
2748 if (!blk_is_available(blk
)) {
2749 error_setg(errp
, "Device '%s' has no medium", device
);
2754 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_STREAM
, errp
)) {
2759 base_bs
= bdrv_find_backing_image(bs
, base
);
2760 if (base_bs
== NULL
) {
2761 error_setg(errp
, QERR_BASE_NOT_FOUND
, base
);
2764 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
2768 /* if we are streaming the entire chain, the result will have no backing
2769 * file, and specifying one is therefore an error */
2770 if (base_bs
== NULL
&& has_backing_file
) {
2771 error_setg(errp
, "backing file specified, but streaming the "
2776 /* backing_file string overrides base bs filename */
2777 base_name
= has_backing_file
? backing_file
: base_name
;
2779 stream_start(bs
, base_bs
, base_name
, has_speed
? speed
: 0,
2780 on_error
, block_job_cb
, bs
, &local_err
);
2782 error_propagate(errp
, local_err
);
2786 trace_qmp_block_stream(bs
, bs
->job
);
2789 aio_context_release(aio_context
);
2792 void qmp_block_commit(const char *device
,
2793 bool has_base
, const char *base
,
2794 bool has_top
, const char *top
,
2795 bool has_backing_file
, const char *backing_file
,
2796 bool has_speed
, int64_t speed
,
2800 BlockDriverState
*bs
;
2801 BlockDriverState
*base_bs
, *top_bs
;
2802 AioContext
*aio_context
;
2803 Error
*local_err
= NULL
;
2804 /* This will be part of the QMP command, if/when the
2805 * BlockdevOnError change for blkmirror makes it in
2807 BlockdevOnError on_error
= BLOCKDEV_ON_ERROR_REPORT
;
2814 * libvirt relies on the DeviceNotFound error class in order to probe for
2815 * live commit feature versions; for this to work, we must make sure to
2816 * perform the device lookup before any generic errors that may occur in a
2817 * scenario in which all optional arguments are omitted. */
2818 blk
= blk_by_name(device
);
2820 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2821 "Device '%s' not found", device
);
2825 aio_context
= blk_get_aio_context(blk
);
2826 aio_context_acquire(aio_context
);
2828 if (!blk_is_available(blk
)) {
2829 error_setg(errp
, "Device '%s' has no medium", device
);
2834 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_COMMIT_SOURCE
, errp
)) {
2838 /* default top_bs is the active layer */
2841 if (has_top
&& top
) {
2842 if (strcmp(bs
->filename
, top
) != 0) {
2843 top_bs
= bdrv_find_backing_image(bs
, top
);
2847 if (top_bs
== NULL
) {
2848 error_setg(errp
, "Top image file %s not found", top
? top
: "NULL");
2852 assert(bdrv_get_aio_context(top_bs
) == aio_context
);
2854 if (has_base
&& base
) {
2855 base_bs
= bdrv_find_backing_image(top_bs
, base
);
2857 base_bs
= bdrv_find_base(top_bs
);
2860 if (base_bs
== NULL
) {
2861 error_setg(errp
, QERR_BASE_NOT_FOUND
, base
? base
: "NULL");
2865 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
2867 if (bdrv_op_is_blocked(base_bs
, BLOCK_OP_TYPE_COMMIT_TARGET
, errp
)) {
2871 /* Do not allow attempts to commit an image into itself */
2872 if (top_bs
== base_bs
) {
2873 error_setg(errp
, "cannot commit an image into itself");
2878 if (has_backing_file
) {
2879 error_setg(errp
, "'backing-file' specified,"
2880 " but 'top' is the active layer");
2883 commit_active_start(bs
, base_bs
, speed
, on_error
, block_job_cb
,
2886 commit_start(bs
, base_bs
, top_bs
, speed
, on_error
, block_job_cb
, bs
,
2887 has_backing_file
? backing_file
: NULL
, &local_err
);
2889 if (local_err
!= NULL
) {
2890 error_propagate(errp
, local_err
);
2895 aio_context_release(aio_context
);
2898 void qmp_drive_backup(const char *device
, const char *target
,
2899 bool has_format
, const char *format
,
2900 enum MirrorSyncMode sync
,
2901 bool has_mode
, enum NewImageMode mode
,
2902 bool has_speed
, int64_t speed
,
2903 bool has_bitmap
, const char *bitmap
,
2904 bool has_on_source_error
, BlockdevOnError on_source_error
,
2905 bool has_on_target_error
, BlockdevOnError on_target_error
,
2909 BlockDriverState
*bs
;
2910 BlockDriverState
*target_bs
;
2911 BlockDriverState
*source
= NULL
;
2912 BdrvDirtyBitmap
*bmap
= NULL
;
2913 AioContext
*aio_context
;
2914 QDict
*options
= NULL
;
2915 Error
*local_err
= NULL
;
2923 if (!has_on_source_error
) {
2924 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
2926 if (!has_on_target_error
) {
2927 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
2930 mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
2933 blk
= blk_by_name(device
);
2935 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2936 "Device '%s' not found", device
);
2940 aio_context
= blk_get_aio_context(blk
);
2941 aio_context_acquire(aio_context
);
2943 /* Although backup_run has this check too, we need to use bs->drv below, so
2944 * do an early check redundantly. */
2945 if (!blk_is_available(blk
)) {
2946 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
2952 format
= mode
== NEW_IMAGE_MODE_EXISTING
? NULL
: bs
->drv
->format_name
;
2955 /* Early check to avoid creating target */
2956 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_BACKUP_SOURCE
, errp
)) {
2960 flags
= bs
->open_flags
| BDRV_O_RDWR
;
2962 /* See if we have a backing HD we can use to create our new image
2964 if (sync
== MIRROR_SYNC_MODE_TOP
) {
2965 source
= backing_bs(bs
);
2967 sync
= MIRROR_SYNC_MODE_FULL
;
2970 if (sync
== MIRROR_SYNC_MODE_NONE
) {
2974 size
= bdrv_getlength(bs
);
2976 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
2980 if (mode
!= NEW_IMAGE_MODE_EXISTING
) {
2983 bdrv_img_create(target
, format
, source
->filename
,
2984 source
->drv
->format_name
, NULL
,
2985 size
, flags
, &local_err
, false);
2987 bdrv_img_create(target
, format
, NULL
, NULL
, NULL
,
2988 size
, flags
, &local_err
, false);
2993 error_propagate(errp
, local_err
);
2998 options
= qdict_new();
2999 qdict_put(options
, "driver", qstring_from_str(format
));
3003 ret
= bdrv_open(&target_bs
, target
, NULL
, options
, flags
, &local_err
);
3005 error_propagate(errp
, local_err
);
3009 bdrv_set_aio_context(target_bs
, aio_context
);
3012 bmap
= bdrv_find_dirty_bitmap(bs
, bitmap
);
3014 error_setg(errp
, "Bitmap '%s' could not be found", bitmap
);
3019 backup_start(bs
, target_bs
, speed
, sync
, bmap
,
3020 on_source_error
, on_target_error
,
3021 block_job_cb
, bs
, &local_err
);
3022 if (local_err
!= NULL
) {
3023 bdrv_unref(target_bs
);
3024 error_propagate(errp
, local_err
);
3029 aio_context_release(aio_context
);
3032 BlockDeviceInfoList
*qmp_query_named_block_nodes(Error
**errp
)
3034 return bdrv_named_nodes_list(errp
);
3037 void qmp_blockdev_backup(const char *device
, const char *target
,
3038 enum MirrorSyncMode sync
,
3039 bool has_speed
, int64_t speed
,
3040 bool has_on_source_error
,
3041 BlockdevOnError on_source_error
,
3042 bool has_on_target_error
,
3043 BlockdevOnError on_target_error
,
3046 BlockBackend
*blk
, *target_blk
;
3047 BlockDriverState
*bs
;
3048 BlockDriverState
*target_bs
;
3049 Error
*local_err
= NULL
;
3050 AioContext
*aio_context
;
3055 if (!has_on_source_error
) {
3056 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
3058 if (!has_on_target_error
) {
3059 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
3062 blk
= blk_by_name(device
);
3064 error_setg(errp
, "Device '%s' not found", device
);
3068 aio_context
= blk_get_aio_context(blk
);
3069 aio_context_acquire(aio_context
);
3071 if (!blk_is_available(blk
)) {
3072 error_setg(errp
, "Device '%s' has no medium", device
);
3077 target_blk
= blk_by_name(target
);
3079 error_setg(errp
, "Device '%s' not found", target
);
3083 if (!blk_is_available(target_blk
)) {
3084 error_setg(errp
, "Device '%s' has no medium", target
);
3087 target_bs
= blk_bs(target_blk
);
3089 bdrv_ref(target_bs
);
3090 bdrv_set_aio_context(target_bs
, aio_context
);
3091 backup_start(bs
, target_bs
, speed
, sync
, NULL
, on_source_error
,
3092 on_target_error
, block_job_cb
, bs
, &local_err
);
3093 if (local_err
!= NULL
) {
3094 bdrv_unref(target_bs
);
3095 error_propagate(errp
, local_err
);
3098 aio_context_release(aio_context
);
3101 void qmp_drive_mirror(const char *device
, const char *target
,
3102 bool has_format
, const char *format
,
3103 bool has_node_name
, const char *node_name
,
3104 bool has_replaces
, const char *replaces
,
3105 enum MirrorSyncMode sync
,
3106 bool has_mode
, enum NewImageMode mode
,
3107 bool has_speed
, int64_t speed
,
3108 bool has_granularity
, uint32_t granularity
,
3109 bool has_buf_size
, int64_t buf_size
,
3110 bool has_on_source_error
, BlockdevOnError on_source_error
,
3111 bool has_on_target_error
, BlockdevOnError on_target_error
,
3112 bool has_unmap
, bool unmap
,
3116 BlockDriverState
*bs
;
3117 BlockDriverState
*source
, *target_bs
;
3118 AioContext
*aio_context
;
3119 Error
*local_err
= NULL
;
3128 if (!has_on_source_error
) {
3129 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
3131 if (!has_on_target_error
) {
3132 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
3135 mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
3137 if (!has_granularity
) {
3140 if (!has_buf_size
) {
3147 if (granularity
!= 0 && (granularity
< 512 || granularity
> 1048576 * 64)) {
3148 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
3149 "a value in range [512B, 64MB]");
3152 if (granularity
& (granularity
- 1)) {
3153 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
3158 blk
= blk_by_name(device
);
3160 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
3161 "Device '%s' not found", device
);
3165 aio_context
= blk_get_aio_context(blk
);
3166 aio_context_acquire(aio_context
);
3168 if (!blk_is_available(blk
)) {
3169 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
3175 format
= mode
== NEW_IMAGE_MODE_EXISTING
? NULL
: bs
->drv
->format_name
;
3178 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_MIRROR
, errp
)) {
3182 flags
= bs
->open_flags
| BDRV_O_RDWR
;
3183 source
= backing_bs(bs
);
3184 if (!source
&& sync
== MIRROR_SYNC_MODE_TOP
) {
3185 sync
= MIRROR_SYNC_MODE_FULL
;
3187 if (sync
== MIRROR_SYNC_MODE_NONE
) {
3191 size
= bdrv_getlength(bs
);
3193 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
3198 BlockDriverState
*to_replace_bs
;
3199 AioContext
*replace_aio_context
;
3200 int64_t replace_size
;
3202 if (!has_node_name
) {
3203 error_setg(errp
, "a node-name must be provided when replacing a"
3204 " named node of the graph");
3208 to_replace_bs
= check_to_replace_node(bs
, replaces
, &local_err
);
3210 if (!to_replace_bs
) {
3211 error_propagate(errp
, local_err
);
3215 replace_aio_context
= bdrv_get_aio_context(to_replace_bs
);
3216 aio_context_acquire(replace_aio_context
);
3217 replace_size
= bdrv_getlength(to_replace_bs
);
3218 aio_context_release(replace_aio_context
);
3220 if (size
!= replace_size
) {
3221 error_setg(errp
, "cannot replace image with a mirror image of "
3227 if ((sync
== MIRROR_SYNC_MODE_FULL
|| !source
)
3228 && mode
!= NEW_IMAGE_MODE_EXISTING
)
3230 /* create new image w/o backing file */
3232 bdrv_img_create(target
, format
,
3233 NULL
, NULL
, NULL
, size
, flags
, &local_err
, false);
3236 case NEW_IMAGE_MODE_EXISTING
:
3238 case NEW_IMAGE_MODE_ABSOLUTE_PATHS
:
3239 /* create new image with backing file */
3240 bdrv_img_create(target
, format
,
3242 source
->drv
->format_name
,
3243 NULL
, size
, flags
, &local_err
, false);
3251 error_propagate(errp
, local_err
);
3255 options
= qdict_new();
3256 if (has_node_name
) {
3257 qdict_put(options
, "node-name", qstring_from_str(node_name
));
3260 qdict_put(options
, "driver", qstring_from_str(format
));
3263 /* Mirroring takes care of copy-on-write using the source's backing
3267 ret
= bdrv_open(&target_bs
, target
, NULL
, options
,
3268 flags
| BDRV_O_NO_BACKING
, &local_err
);
3270 error_propagate(errp
, local_err
);
3274 bdrv_set_aio_context(target_bs
, aio_context
);
3276 /* pass the node name to replace to mirror start since it's loose coupling
3277 * and will allow to check whether the node still exist at mirror completion
3279 mirror_start(bs
, target_bs
,
3280 has_replaces
? replaces
: NULL
,
3281 speed
, granularity
, buf_size
, sync
,
3282 on_source_error
, on_target_error
,
3284 block_job_cb
, bs
, &local_err
);
3285 if (local_err
!= NULL
) {
3286 bdrv_unref(target_bs
);
3287 error_propagate(errp
, local_err
);
3292 aio_context_release(aio_context
);
3295 /* Get the block job for a given device name and acquire its AioContext */
3296 static BlockJob
*find_block_job(const char *device
, AioContext
**aio_context
,
3300 BlockDriverState
*bs
;
3302 *aio_context
= NULL
;
3304 blk
= blk_by_name(device
);
3309 *aio_context
= blk_get_aio_context(blk
);
3310 aio_context_acquire(*aio_context
);
3312 if (!blk_is_available(blk
)) {
3324 error_set(errp
, ERROR_CLASS_DEVICE_NOT_ACTIVE
,
3325 "No active block job on device '%s'", device
);
3327 aio_context_release(*aio_context
);
3328 *aio_context
= NULL
;
3333 void qmp_block_job_set_speed(const char *device
, int64_t speed
, Error
**errp
)
3335 AioContext
*aio_context
;
3336 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3342 block_job_set_speed(job
, speed
, errp
);
3343 aio_context_release(aio_context
);
3346 void qmp_block_job_cancel(const char *device
,
3347 bool has_force
, bool force
, Error
**errp
)
3349 AioContext
*aio_context
;
3350 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3360 if (job
->user_paused
&& !force
) {
3361 error_setg(errp
, "The block job for device '%s' is currently paused",
3366 trace_qmp_block_job_cancel(job
);
3367 block_job_cancel(job
);
3369 aio_context_release(aio_context
);
3372 void qmp_block_job_pause(const char *device
, Error
**errp
)
3374 AioContext
*aio_context
;
3375 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3377 if (!job
|| job
->user_paused
) {
3381 job
->user_paused
= true;
3382 trace_qmp_block_job_pause(job
);
3383 block_job_pause(job
);
3384 aio_context_release(aio_context
);
3387 void qmp_block_job_resume(const char *device
, Error
**errp
)
3389 AioContext
*aio_context
;
3390 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3392 if (!job
|| !job
->user_paused
) {
3396 job
->user_paused
= false;
3397 trace_qmp_block_job_resume(job
);
3398 block_job_resume(job
);
3399 aio_context_release(aio_context
);
3402 void qmp_block_job_complete(const char *device
, Error
**errp
)
3404 AioContext
*aio_context
;
3405 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3411 trace_qmp_block_job_complete(job
);
3412 block_job_complete(job
, errp
);
3413 aio_context_release(aio_context
);
3416 void qmp_change_backing_file(const char *device
,
3417 const char *image_node_name
,
3418 const char *backing_file
,
3422 BlockDriverState
*bs
= NULL
;
3423 AioContext
*aio_context
;
3424 BlockDriverState
*image_bs
= NULL
;
3425 Error
*local_err
= NULL
;
3430 blk
= blk_by_name(device
);
3432 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
3433 "Device '%s' not found", device
);
3437 aio_context
= blk_get_aio_context(blk
);
3438 aio_context_acquire(aio_context
);
3440 if (!blk_is_available(blk
)) {
3441 error_setg(errp
, "Device '%s' has no medium", device
);
3446 image_bs
= bdrv_lookup_bs(NULL
, image_node_name
, &local_err
);
3448 error_propagate(errp
, local_err
);
3453 error_setg(errp
, "image file not found");
3457 if (bdrv_find_base(image_bs
) == image_bs
) {
3458 error_setg(errp
, "not allowing backing file change on an image "
3459 "without a backing file");
3463 /* even though we are not necessarily operating on bs, we need it to
3464 * determine if block ops are currently prohibited on the chain */
3465 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_CHANGE
, errp
)) {
3469 /* final sanity check */
3470 if (!bdrv_chain_contains(bs
, image_bs
)) {
3471 error_setg(errp
, "'%s' and image file are not in the same chain",
3476 /* if not r/w, reopen to make r/w */
3477 open_flags
= image_bs
->open_flags
;
3478 ro
= bdrv_is_read_only(image_bs
);
3481 bdrv_reopen(image_bs
, open_flags
| BDRV_O_RDWR
, &local_err
);
3483 error_propagate(errp
, local_err
);
3488 ret
= bdrv_change_backing_file(image_bs
, backing_file
,
3489 image_bs
->drv
? image_bs
->drv
->format_name
: "");
3492 error_setg_errno(errp
, -ret
, "Could not change backing file to '%s'",
3494 /* don't exit here, so we can try to restore open flags if
3499 bdrv_reopen(image_bs
, open_flags
, &local_err
);
3501 error_propagate(errp
, local_err
); /* will preserve prior errp */
3506 aio_context_release(aio_context
);
3509 void qmp_blockdev_add(BlockdevOptions
*options
, Error
**errp
)
3511 QmpOutputVisitor
*ov
= qmp_output_visitor_new();
3512 BlockDriverState
*bs
;
3513 BlockBackend
*blk
= NULL
;
3516 Error
*local_err
= NULL
;
3518 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3519 * cache.direct=false instead of silently switching to aio=threads, except
3520 * when called from drive_new().
3522 * For now, simply forbidding the combination for all drivers will do. */
3523 if (options
->has_aio
&& options
->aio
== BLOCKDEV_AIO_OPTIONS_NATIVE
) {
3524 bool direct
= options
->has_cache
&&
3525 options
->cache
->has_direct
&&
3526 options
->cache
->direct
;
3528 error_setg(errp
, "aio=native requires cache.direct=true");
3533 visit_type_BlockdevOptions(qmp_output_get_visitor(ov
),
3534 &options
, NULL
, &local_err
);
3536 error_propagate(errp
, local_err
);
3540 obj
= qmp_output_get_qobject(ov
);
3541 qdict
= qobject_to_qdict(obj
);
3543 qdict_flatten(qdict
);
3545 if (options
->has_id
) {
3546 blk
= blockdev_init(NULL
, qdict
, &local_err
);
3548 error_propagate(errp
, local_err
);
3554 if (!qdict_get_try_str(qdict
, "node-name")) {
3555 error_setg(errp
, "'id' and/or 'node-name' need to be specified for "
3560 bs
= bds_tree_init(qdict
, errp
);
3566 if (bs
&& bdrv_key_required(bs
)) {
3572 error_setg(errp
, "blockdev-add doesn't support encrypted devices");
3577 qmp_output_visitor_cleanup(ov
);
3580 void qmp_x_blockdev_del(bool has_id
, const char *id
,
3581 bool has_node_name
, const char *node_name
, Error
**errp
)
3583 AioContext
*aio_context
;
3585 BlockDriverState
*bs
;
3587 if (has_id
&& has_node_name
) {
3588 error_setg(errp
, "Only one of id and node-name must be specified");
3590 } else if (!has_id
&& !has_node_name
) {
3591 error_setg(errp
, "No block device specified");
3596 blk
= blk_by_name(id
);
3598 error_setg(errp
, "Cannot find block backend %s", id
);
3601 if (blk_get_refcnt(blk
) > 1) {
3602 error_setg(errp
, "Block backend %s is in use", id
);
3606 aio_context
= blk_get_aio_context(blk
);
3608 bs
= bdrv_find_node(node_name
);
3610 error_setg(errp
, "Cannot find node %s", node_name
);
3615 error_setg(errp
, "Node %s is in use by %s",
3616 node_name
, blk_name(blk
));
3619 aio_context
= bdrv_get_aio_context(bs
);
3622 aio_context_acquire(aio_context
);
3625 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_DRIVE_DEL
, errp
)) {
3629 if (bs
->refcnt
> 1 || !QLIST_EMPTY(&bs
->parents
)) {
3630 error_setg(errp
, "Block device %s is in use",
3631 bdrv_get_device_or_node_name(bs
));
3643 aio_context_release(aio_context
);
3646 BlockJobInfoList
*qmp_query_block_jobs(Error
**errp
)
3648 BlockJobInfoList
*head
= NULL
, **p_next
= &head
;
3649 BlockDriverState
*bs
;
3651 for (bs
= bdrv_next(NULL
); bs
; bs
= bdrv_next(bs
)) {
3652 AioContext
*aio_context
= bdrv_get_aio_context(bs
);
3654 aio_context_acquire(aio_context
);
3657 BlockJobInfoList
*elem
= g_new0(BlockJobInfoList
, 1);
3658 elem
->value
= block_job_query(bs
->job
);
3660 p_next
= &elem
->next
;
3663 aio_context_release(aio_context
);
3669 QemuOptsList qemu_common_drive_opts
= {
3671 .head
= QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts
.head
),
3675 .type
= QEMU_OPT_BOOL
,
3676 .help
= "enable/disable snapshot mode",
3679 .type
= QEMU_OPT_STRING
,
3680 .help
= "discard operation (ignore/off, unmap/on)",
3682 .name
= BDRV_OPT_CACHE_WB
,
3683 .type
= QEMU_OPT_BOOL
,
3684 .help
= "enables writeback mode for any caches",
3686 .name
= BDRV_OPT_CACHE_DIRECT
,
3687 .type
= QEMU_OPT_BOOL
,
3688 .help
= "enables use of O_DIRECT (bypass the host page cache)",
3690 .name
= BDRV_OPT_CACHE_NO_FLUSH
,
3691 .type
= QEMU_OPT_BOOL
,
3692 .help
= "ignore any flush requests for the device",
3695 .type
= QEMU_OPT_STRING
,
3696 .help
= "host AIO implementation (threads, native)",
3699 .type
= QEMU_OPT_STRING
,
3700 .help
= "disk format (raw, qcow2, ...)",
3703 .type
= QEMU_OPT_STRING
,
3704 .help
= "read error action",
3707 .type
= QEMU_OPT_STRING
,
3708 .help
= "write error action",
3710 .name
= "read-only",
3711 .type
= QEMU_OPT_BOOL
,
3712 .help
= "open drive file as read-only",
3714 .name
= "throttling.iops-total",
3715 .type
= QEMU_OPT_NUMBER
,
3716 .help
= "limit total I/O operations per second",
3718 .name
= "throttling.iops-read",
3719 .type
= QEMU_OPT_NUMBER
,
3720 .help
= "limit read operations per second",
3722 .name
= "throttling.iops-write",
3723 .type
= QEMU_OPT_NUMBER
,
3724 .help
= "limit write operations per second",
3726 .name
= "throttling.bps-total",
3727 .type
= QEMU_OPT_NUMBER
,
3728 .help
= "limit total bytes per second",
3730 .name
= "throttling.bps-read",
3731 .type
= QEMU_OPT_NUMBER
,
3732 .help
= "limit read bytes per second",
3734 .name
= "throttling.bps-write",
3735 .type
= QEMU_OPT_NUMBER
,
3736 .help
= "limit write bytes per second",
3738 .name
= "throttling.iops-total-max",
3739 .type
= QEMU_OPT_NUMBER
,
3740 .help
= "I/O operations burst",
3742 .name
= "throttling.iops-read-max",
3743 .type
= QEMU_OPT_NUMBER
,
3744 .help
= "I/O operations read burst",
3746 .name
= "throttling.iops-write-max",
3747 .type
= QEMU_OPT_NUMBER
,
3748 .help
= "I/O operations write burst",
3750 .name
= "throttling.bps-total-max",
3751 .type
= QEMU_OPT_NUMBER
,
3752 .help
= "total bytes burst",
3754 .name
= "throttling.bps-read-max",
3755 .type
= QEMU_OPT_NUMBER
,
3756 .help
= "total bytes read burst",
3758 .name
= "throttling.bps-write-max",
3759 .type
= QEMU_OPT_NUMBER
,
3760 .help
= "total bytes write burst",
3762 .name
= "throttling.iops-size",
3763 .type
= QEMU_OPT_NUMBER
,
3764 .help
= "when limiting by iops max size of an I/O in bytes",
3766 .name
= "throttling.group",
3767 .type
= QEMU_OPT_STRING
,
3768 .help
= "name of the block throttling group",
3770 .name
= "copy-on-read",
3771 .type
= QEMU_OPT_BOOL
,
3772 .help
= "copy read data from backing file into image file",
3774 .name
= "detect-zeroes",
3775 .type
= QEMU_OPT_STRING
,
3776 .help
= "try to optimize zero writes (off, on, unmap)",
3778 { /* end of list */ }
3782 static QemuOptsList qemu_root_bds_opts
= {
3784 .head
= QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts
.head
),
3788 .type
= QEMU_OPT_STRING
,
3789 .help
= "discard operation (ignore/off, unmap/on)",
3791 .name
= "cache.writeback",
3792 .type
= QEMU_OPT_BOOL
,
3793 .help
= "enables writeback mode for any caches",
3795 .name
= "cache.direct",
3796 .type
= QEMU_OPT_BOOL
,
3797 .help
= "enables use of O_DIRECT (bypass the host page cache)",
3799 .name
= "cache.no-flush",
3800 .type
= QEMU_OPT_BOOL
,
3801 .help
= "ignore any flush requests for the device",
3804 .type
= QEMU_OPT_STRING
,
3805 .help
= "host AIO implementation (threads, native)",
3807 .name
= "read-only",
3808 .type
= QEMU_OPT_BOOL
,
3809 .help
= "open drive file as read-only",
3811 .name
= "copy-on-read",
3812 .type
= QEMU_OPT_BOOL
,
3813 .help
= "copy read data from backing file into image file",
3815 .name
= "detect-zeroes",
3816 .type
= QEMU_OPT_STRING
,
3817 .help
= "try to optimize zero writes (off, on, unmap)",
3819 { /* end of list */ }
3823 QemuOptsList qemu_drive_opts
= {
3825 .head
= QTAILQ_HEAD_INITIALIZER(qemu_drive_opts
.head
),
3828 * no elements => accept any params
3829 * validation will happen later
3831 { /* end of list */ }