2 * QEMU host block devices
4 * Copyright (c) 2003-2008 Fabrice Bellard
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
9 * This file incorporates work covered by the following copyright and
12 * Copyright (c) 2003-2008 Fabrice Bellard
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
33 #include "qemu/osdep.h"
34 #include "sysemu/block-backend.h"
35 #include "sysemu/blockdev.h"
36 #include "hw/block/block.h"
37 #include "block/blockjob.h"
38 #include "block/throttle-groups.h"
39 #include "monitor/monitor.h"
40 #include "qemu/error-report.h"
41 #include "qemu/option.h"
42 #include "qemu/config-file.h"
43 #include "qapi/qmp/types.h"
44 #include "qapi-visit.h"
45 #include "qapi/qmp/qerror.h"
46 #include "qapi/qmp-output-visitor.h"
47 #include "qapi/util.h"
48 #include "sysemu/sysemu.h"
49 #include "block/block_int.h"
50 #include "qmp-commands.h"
52 #include "sysemu/arch_init.h"
53 #include "qemu/cutils.h"
54 #include "qemu/help_option.h"
56 static QTAILQ_HEAD(, BlockDriverState
) monitor_bdrv_states
=
57 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states
);
59 static const char *const if_name
[IF_COUNT
] = {
63 [IF_FLOPPY
] = "floppy",
64 [IF_PFLASH
] = "pflash",
67 [IF_VIRTIO
] = "virtio",
71 static int if_max_devs
[IF_COUNT
] = {
73 * Do not change these numbers! They govern how drive option
74 * index maps to unit and bus. That mapping is ABI.
76 * All controllers used to imlement if=T drives need to support
77 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
78 * Otherwise, some index values map to "impossible" bus, unit
81 * For instance, if you change [IF_SCSI] to 255, -drive
82 * if=scsi,index=12 no longer means bus=1,unit=5, but
83 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
84 * the drive can't be set up. Regression.
91 * Boards may call this to offer board-by-board overrides
92 * of the default, global values.
94 void override_max_devs(BlockInterfaceType type
, int max_devs
)
103 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
104 dinfo
= blk_legacy_dinfo(blk
);
105 if (dinfo
->type
== type
) {
106 fprintf(stderr
, "Cannot override units-per-bus property of"
107 " the %s interface, because a drive of that type has"
108 " already been added.\n", if_name
[type
]);
109 g_assert_not_reached();
113 if_max_devs
[type
] = max_devs
;
117 * We automatically delete the drive when a device using it gets
118 * unplugged. Questionable feature, but we can't just drop it.
119 * Device models call blockdev_mark_auto_del() to schedule the
120 * automatic deletion, and generic qdev code calls blockdev_auto_del()
121 * when deletion is actually safe.
123 void blockdev_mark_auto_del(BlockBackend
*blk
)
125 DriveInfo
*dinfo
= blk_legacy_dinfo(blk
);
126 BlockDriverState
*bs
= blk_bs(blk
);
127 AioContext
*aio_context
;
134 aio_context
= bdrv_get_aio_context(bs
);
135 aio_context_acquire(aio_context
);
138 block_job_cancel(bs
->job
);
141 aio_context_release(aio_context
);
147 void blockdev_auto_del(BlockBackend
*blk
)
149 DriveInfo
*dinfo
= blk_legacy_dinfo(blk
);
151 if (dinfo
&& dinfo
->auto_del
) {
152 monitor_remove_blk(blk
);
158 * Returns the current mapping of how many units per bus
159 * a particular interface can support.
161 * A positive integer indicates n units per bus.
162 * 0 implies the mapping has not been established.
163 * -1 indicates an invalid BlockInterfaceType was given.
165 int drive_get_max_devs(BlockInterfaceType type
)
167 if (type
>= IF_IDE
&& type
< IF_COUNT
) {
168 return if_max_devs
[type
];
174 static int drive_index_to_bus_id(BlockInterfaceType type
, int index
)
176 int max_devs
= if_max_devs
[type
];
177 return max_devs
? index
/ max_devs
: 0;
180 static int drive_index_to_unit_id(BlockInterfaceType type
, int index
)
182 int max_devs
= if_max_devs
[type
];
183 return max_devs
? index
% max_devs
: index
;
186 QemuOpts
*drive_def(const char *optstr
)
188 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr
, false);
191 QemuOpts
*drive_add(BlockInterfaceType type
, int index
, const char *file
,
196 opts
= drive_def(optstr
);
200 if (type
!= IF_DEFAULT
) {
201 qemu_opt_set(opts
, "if", if_name
[type
], &error_abort
);
204 qemu_opt_set_number(opts
, "index", index
, &error_abort
);
207 qemu_opt_set(opts
, "file", file
, &error_abort
);
211 DriveInfo
*drive_get(BlockInterfaceType type
, int bus
, int unit
)
216 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
217 dinfo
= blk_legacy_dinfo(blk
);
218 if (dinfo
&& dinfo
->type
== type
219 && dinfo
->bus
== bus
&& dinfo
->unit
== unit
) {
227 bool drive_check_orphaned(void)
233 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
234 dinfo
= blk_legacy_dinfo(blk
);
235 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
236 /* Unless this is a default drive, this may be an oversight. */
237 if (!blk_get_attached_dev(blk
) && !dinfo
->is_default
&&
238 dinfo
->type
!= IF_NONE
) {
239 fprintf(stderr
, "Warning: Orphaned drive without device: "
240 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
241 blk_name(blk
), blk_bs(blk
) ? blk_bs(blk
)->filename
: "",
242 if_name
[dinfo
->type
], dinfo
->bus
, dinfo
->unit
);
250 DriveInfo
*drive_get_by_index(BlockInterfaceType type
, int index
)
252 return drive_get(type
,
253 drive_index_to_bus_id(type
, index
),
254 drive_index_to_unit_id(type
, index
));
257 int drive_get_max_bus(BlockInterfaceType type
)
264 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
265 dinfo
= blk_legacy_dinfo(blk
);
266 if (dinfo
&& dinfo
->type
== type
&& dinfo
->bus
> max_bus
) {
267 max_bus
= dinfo
->bus
;
273 /* Get a block device. This should only be used for single-drive devices
274 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
276 DriveInfo
*drive_get_next(BlockInterfaceType type
)
278 static int next_block_unit
[IF_COUNT
];
280 return drive_get(type
, 0, next_block_unit
[type
]++);
283 static void bdrv_format_print(void *opaque
, const char *name
)
285 error_printf(" %s", name
);
290 BlockDriverState
*bs
;
293 static int parse_block_error_action(const char *buf
, bool is_read
, Error
**errp
)
295 if (!strcmp(buf
, "ignore")) {
296 return BLOCKDEV_ON_ERROR_IGNORE
;
297 } else if (!is_read
&& !strcmp(buf
, "enospc")) {
298 return BLOCKDEV_ON_ERROR_ENOSPC
;
299 } else if (!strcmp(buf
, "stop")) {
300 return BLOCKDEV_ON_ERROR_STOP
;
301 } else if (!strcmp(buf
, "report")) {
302 return BLOCKDEV_ON_ERROR_REPORT
;
304 error_setg(errp
, "'%s' invalid %s error action",
305 buf
, is_read
? "read" : "write");
310 static bool parse_stats_intervals(BlockAcctStats
*stats
, QList
*intervals
,
313 const QListEntry
*entry
;
314 for (entry
= qlist_first(intervals
); entry
; entry
= qlist_next(entry
)) {
315 switch (qobject_type(entry
->value
)) {
317 case QTYPE_QSTRING
: {
318 unsigned long long length
;
319 const char *str
= qstring_get_str(qobject_to_qstring(entry
->value
));
320 if (parse_uint_full(str
, &length
, 10) == 0 &&
321 length
> 0 && length
<= UINT_MAX
) {
322 block_acct_add_interval(stats
, (unsigned) length
);
324 error_setg(errp
, "Invalid interval length: %s", str
);
331 int64_t length
= qint_get_int(qobject_to_qint(entry
->value
));
332 if (length
> 0 && length
<= UINT_MAX
) {
333 block_acct_add_interval(stats
, (unsigned) length
);
335 error_setg(errp
, "Invalid interval length: %" PRId64
, length
);
342 error_setg(errp
, "The specification of stats-intervals is invalid");
349 typedef enum { MEDIA_DISK
, MEDIA_CDROM
} DriveMediaType
;
351 /* All parameters but @opts are optional and may be set to NULL. */
352 static void extract_common_blockdev_options(QemuOpts
*opts
, int *bdrv_flags
,
353 const char **throttling_group
, ThrottleConfig
*throttle_cfg
,
354 BlockdevDetectZeroesOptions
*detect_zeroes
, Error
**errp
)
357 Error
*local_error
= NULL
;
361 if (!qemu_opt_get_bool(opts
, "read-only", false)) {
362 *bdrv_flags
|= BDRV_O_RDWR
;
364 if (qemu_opt_get_bool(opts
, "copy-on-read", false)) {
365 *bdrv_flags
|= BDRV_O_COPY_ON_READ
;
368 if ((discard
= qemu_opt_get(opts
, "discard")) != NULL
) {
369 if (bdrv_parse_discard_flags(discard
, bdrv_flags
) != 0) {
370 error_setg(errp
, "Invalid discard option");
375 if ((aio
= qemu_opt_get(opts
, "aio")) != NULL
) {
376 if (!strcmp(aio
, "native")) {
377 *bdrv_flags
|= BDRV_O_NATIVE_AIO
;
378 } else if (!strcmp(aio
, "threads")) {
379 /* this is the default */
381 error_setg(errp
, "invalid aio option");
387 /* disk I/O throttling */
388 if (throttling_group
) {
389 *throttling_group
= qemu_opt_get(opts
, "throttling.group");
393 throttle_config_init(throttle_cfg
);
394 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].avg
=
395 qemu_opt_get_number(opts
, "throttling.bps-total", 0);
396 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].avg
=
397 qemu_opt_get_number(opts
, "throttling.bps-read", 0);
398 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].avg
=
399 qemu_opt_get_number(opts
, "throttling.bps-write", 0);
400 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].avg
=
401 qemu_opt_get_number(opts
, "throttling.iops-total", 0);
402 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].avg
=
403 qemu_opt_get_number(opts
, "throttling.iops-read", 0);
404 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].avg
=
405 qemu_opt_get_number(opts
, "throttling.iops-write", 0);
407 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].max
=
408 qemu_opt_get_number(opts
, "throttling.bps-total-max", 0);
409 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].max
=
410 qemu_opt_get_number(opts
, "throttling.bps-read-max", 0);
411 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].max
=
412 qemu_opt_get_number(opts
, "throttling.bps-write-max", 0);
413 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].max
=
414 qemu_opt_get_number(opts
, "throttling.iops-total-max", 0);
415 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].max
=
416 qemu_opt_get_number(opts
, "throttling.iops-read-max", 0);
417 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].max
=
418 qemu_opt_get_number(opts
, "throttling.iops-write-max", 0);
420 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].burst_length
=
421 qemu_opt_get_number(opts
, "throttling.bps-total-max-length", 1);
422 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].burst_length
=
423 qemu_opt_get_number(opts
, "throttling.bps-read-max-length", 1);
424 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].burst_length
=
425 qemu_opt_get_number(opts
, "throttling.bps-write-max-length", 1);
426 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].burst_length
=
427 qemu_opt_get_number(opts
, "throttling.iops-total-max-length", 1);
428 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].burst_length
=
429 qemu_opt_get_number(opts
, "throttling.iops-read-max-length", 1);
430 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].burst_length
=
431 qemu_opt_get_number(opts
, "throttling.iops-write-max-length", 1);
433 throttle_cfg
->op_size
=
434 qemu_opt_get_number(opts
, "throttling.iops-size", 0);
436 if (!throttle_is_valid(throttle_cfg
, errp
)) {
443 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup
,
444 qemu_opt_get(opts
, "detect-zeroes"),
445 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX
,
446 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
,
449 error_propagate(errp
, local_error
);
454 *detect_zeroes
== BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP
&&
455 !(*bdrv_flags
& BDRV_O_UNMAP
))
457 error_setg(errp
, "setting detect-zeroes to unmap is not allowed "
458 "without setting discard operation to unmap");
464 /* Takes the ownership of bs_opts */
465 static BlockBackend
*blockdev_init(const char *file
, QDict
*bs_opts
,
470 int on_read_error
, on_write_error
;
471 bool account_invalid
, account_failed
;
474 BlockDriverState
*bs
;
479 QDict
*interval_dict
= NULL
;
480 QList
*interval_list
= NULL
;
482 BlockdevDetectZeroesOptions detect_zeroes
=
483 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
;
485 const char *throttling_group
= NULL
;
487 /* Check common options by copying from bs_opts to opts, all other options
488 * stay in bs_opts for processing by bdrv_open(). */
489 id
= qdict_get_try_str(bs_opts
, "id");
490 opts
= qemu_opts_create(&qemu_common_drive_opts
, id
, 1, &error
);
492 error_propagate(errp
, error
);
496 qemu_opts_absorb_qdict(opts
, bs_opts
, &error
);
498 error_propagate(errp
, error
);
503 qdict_del(bs_opts
, "id");
506 /* extract parameters */
507 snapshot
= qemu_opt_get_bool(opts
, "snapshot", 0);
509 account_invalid
= qemu_opt_get_bool(opts
, "stats-account-invalid", true);
510 account_failed
= qemu_opt_get_bool(opts
, "stats-account-failed", true);
512 writethrough
= !qemu_opt_get_bool(opts
, BDRV_OPT_CACHE_WB
, true);
514 blk_id
= qemu_opts_id(opts
);
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
;
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_id
;
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_DIRECT
, "off");
602 qdict_set_default_str(bs_opts
, BDRV_OPT_CACHE_NO_FLUSH
, "off");
603 assert((bdrv_flags
& BDRV_O_CACHE_MASK
) == 0);
605 if (runstate_check(RUN_STATE_INMIGRATE
)) {
606 bdrv_flags
|= BDRV_O_INACTIVE
;
609 blk
= blk_new_open(file
, NULL
, bs_opts
, bdrv_flags
, errp
);
615 bs
->detect_zeroes
= detect_zeroes
;
617 /* disk I/O throttling */
618 if (throttle_enabled(&cfg
)) {
619 if (!throttling_group
) {
620 throttling_group
= blk_id
;
622 bdrv_io_limits_enable(bs
, throttling_group
);
623 bdrv_set_io_limits(bs
, &cfg
);
626 if (bdrv_key_required(bs
)) {
630 block_acct_init(blk_get_stats(blk
), account_invalid
, account_failed
);
632 if (!parse_stats_intervals(blk_get_stats(blk
), interval_list
, errp
)) {
639 blk_set_enable_write_cache(blk
, !writethrough
);
640 blk_set_on_error(blk
, on_read_error
, on_write_error
);
642 if (!monitor_add_blk(blk
, blk_id
, errp
)) {
650 QDECREF(interval_dict
);
651 QDECREF(interval_list
);
656 QDECREF(interval_dict
);
657 QDECREF(interval_list
);
663 static QemuOptsList qemu_root_bds_opts
;
665 /* Takes the ownership of bs_opts */
666 static BlockDriverState
*bds_tree_init(QDict
*bs_opts
, Error
**errp
)
668 BlockDriverState
*bs
;
670 Error
*local_error
= NULL
;
671 BlockdevDetectZeroesOptions detect_zeroes
;
675 opts
= qemu_opts_create(&qemu_root_bds_opts
, NULL
, 1, errp
);
680 qemu_opts_absorb_qdict(opts
, bs_opts
, &local_error
);
682 error_propagate(errp
, local_error
);
686 extract_common_blockdev_options(opts
, &bdrv_flags
, NULL
, NULL
,
687 &detect_zeroes
, &local_error
);
689 error_propagate(errp
, local_error
);
693 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
694 * with other callers) rather than what we want as the real defaults.
695 * Apply the defaults here instead. */
696 qdict_set_default_str(bs_opts
, BDRV_OPT_CACHE_DIRECT
, "off");
697 qdict_set_default_str(bs_opts
, BDRV_OPT_CACHE_NO_FLUSH
, "off");
699 if (runstate_check(RUN_STATE_INMIGRATE
)) {
700 bdrv_flags
|= BDRV_O_INACTIVE
;
704 ret
= bdrv_open(&bs
, NULL
, NULL
, bs_opts
, bdrv_flags
, errp
);
706 goto fail_no_bs_opts
;
709 bs
->detect_zeroes
= detect_zeroes
;
721 void blockdev_close_all_bdrv_states(void)
723 BlockDriverState
*bs
, *next_bs
;
725 QTAILQ_FOREACH_SAFE(bs
, &monitor_bdrv_states
, monitor_list
, next_bs
) {
726 AioContext
*ctx
= bdrv_get_aio_context(bs
);
728 aio_context_acquire(ctx
);
730 aio_context_release(ctx
);
734 /* Iterates over the list of monitor-owned BlockDriverStates */
735 BlockDriverState
*bdrv_next_monitor_owned(BlockDriverState
*bs
)
737 return bs
? QTAILQ_NEXT(bs
, monitor_list
)
738 : QTAILQ_FIRST(&monitor_bdrv_states
);
741 static void qemu_opt_rename(QemuOpts
*opts
, const char *from
, const char *to
,
746 value
= qemu_opt_get(opts
, from
);
748 if (qemu_opt_find(opts
, to
)) {
749 error_setg(errp
, "'%s' and its alias '%s' can't be used at the "
750 "same time", to
, from
);
755 /* rename all items in opts */
756 while ((value
= qemu_opt_get(opts
, from
))) {
757 qemu_opt_set(opts
, to
, value
, &error_abort
);
758 qemu_opt_unset(opts
, from
);
762 QemuOptsList qemu_legacy_drive_opts
= {
764 .head
= QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts
.head
),
768 .type
= QEMU_OPT_NUMBER
,
769 .help
= "bus number",
772 .type
= QEMU_OPT_NUMBER
,
773 .help
= "unit number (i.e. lun for scsi)",
776 .type
= QEMU_OPT_NUMBER
,
777 .help
= "index number",
780 .type
= QEMU_OPT_STRING
,
781 .help
= "media type (disk, cdrom)",
784 .type
= QEMU_OPT_STRING
,
785 .help
= "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
788 .type
= QEMU_OPT_NUMBER
,
789 .help
= "number of cylinders (ide disk geometry)",
792 .type
= QEMU_OPT_NUMBER
,
793 .help
= "number of heads (ide disk geometry)",
796 .type
= QEMU_OPT_NUMBER
,
797 .help
= "number of sectors (ide disk geometry)",
800 .type
= QEMU_OPT_STRING
,
801 .help
= "chs translation (auto, lba, none)",
804 .type
= QEMU_OPT_BOOL
,
805 .help
= "(deprecated, ignored)",
808 .type
= QEMU_OPT_STRING
,
809 .help
= "pci address (virtio only)",
812 .type
= QEMU_OPT_STRING
,
813 .help
= "disk serial number",
816 .type
= QEMU_OPT_STRING
,
820 /* Options that are passed on, but have special semantics with -drive */
823 .type
= QEMU_OPT_BOOL
,
824 .help
= "open drive file as read-only",
827 .type
= QEMU_OPT_STRING
,
828 .help
= "read error action",
831 .type
= QEMU_OPT_STRING
,
832 .help
= "write error action",
834 .name
= "copy-on-read",
835 .type
= QEMU_OPT_BOOL
,
836 .help
= "copy read data from backing file into image file",
839 { /* end of list */ }
843 DriveInfo
*drive_new(QemuOpts
*all_opts
, BlockInterfaceType block_default_type
)
847 DriveInfo
*dinfo
= NULL
;
849 QemuOpts
*legacy_opts
;
850 DriveMediaType media
= MEDIA_DISK
;
851 BlockInterfaceType type
;
852 int cyls
, heads
, secs
, translation
;
853 int max_devs
, bus_id
, unit_id
, index
;
855 const char *werror
, *rerror
;
856 bool read_only
= false;
859 const char *filename
;
860 Error
*local_err
= NULL
;
863 /* Change legacy command line options into QMP ones */
864 static const struct {
868 { "iops", "throttling.iops-total" },
869 { "iops_rd", "throttling.iops-read" },
870 { "iops_wr", "throttling.iops-write" },
872 { "bps", "throttling.bps-total" },
873 { "bps_rd", "throttling.bps-read" },
874 { "bps_wr", "throttling.bps-write" },
876 { "iops_max", "throttling.iops-total-max" },
877 { "iops_rd_max", "throttling.iops-read-max" },
878 { "iops_wr_max", "throttling.iops-write-max" },
880 { "bps_max", "throttling.bps-total-max" },
881 { "bps_rd_max", "throttling.bps-read-max" },
882 { "bps_wr_max", "throttling.bps-write-max" },
884 { "iops_size", "throttling.iops-size" },
886 { "group", "throttling.group" },
888 { "readonly", "read-only" },
891 for (i
= 0; i
< ARRAY_SIZE(opt_renames
); i
++) {
892 qemu_opt_rename(all_opts
, opt_renames
[i
].from
, opt_renames
[i
].to
,
895 error_report_err(local_err
);
900 value
= qemu_opt_get(all_opts
, "cache");
905 if (bdrv_parse_cache_mode(value
, &flags
, &writethrough
) != 0) {
906 error_report("invalid cache option");
910 /* Specific options take precedence */
911 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_WB
)) {
912 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_WB
,
913 !writethrough
, &error_abort
);
915 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_DIRECT
)) {
916 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_DIRECT
,
917 !!(flags
& BDRV_O_NOCACHE
), &error_abort
);
919 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_NO_FLUSH
)) {
920 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_NO_FLUSH
,
921 !!(flags
& BDRV_O_NO_FLUSH
), &error_abort
);
923 qemu_opt_unset(all_opts
, "cache");
926 /* Get a QDict for processing the options */
927 bs_opts
= qdict_new();
928 qemu_opts_to_qdict(all_opts
, bs_opts
);
930 legacy_opts
= qemu_opts_create(&qemu_legacy_drive_opts
, NULL
, 0,
932 qemu_opts_absorb_qdict(legacy_opts
, bs_opts
, &local_err
);
934 error_report_err(local_err
);
938 /* Deprecated option boot=[on|off] */
939 if (qemu_opt_get(legacy_opts
, "boot") != NULL
) {
940 fprintf(stderr
, "qemu-kvm: boot=on|off is deprecated and will be "
941 "ignored. Future versions will reject this parameter. Please "
942 "update your scripts.\n");
946 value
= qemu_opt_get(legacy_opts
, "media");
948 if (!strcmp(value
, "disk")) {
950 } else if (!strcmp(value
, "cdrom")) {
954 error_report("'%s' invalid media", value
);
959 /* copy-on-read is disabled with a warning for read-only devices */
960 read_only
|= qemu_opt_get_bool(legacy_opts
, "read-only", false);
961 copy_on_read
= qemu_opt_get_bool(legacy_opts
, "copy-on-read", false);
963 if (read_only
&& copy_on_read
) {
964 error_report("warning: disabling copy-on-read on read-only drive");
965 copy_on_read
= false;
968 qdict_put(bs_opts
, "read-only",
969 qstring_from_str(read_only
? "on" : "off"));
970 qdict_put(bs_opts
, "copy-on-read",
971 qstring_from_str(copy_on_read
? "on" :"off"));
973 /* Controller type */
974 value
= qemu_opt_get(legacy_opts
, "if");
977 type
< IF_COUNT
&& strcmp(value
, if_name
[type
]);
980 if (type
== IF_COUNT
) {
981 error_report("unsupported bus type '%s'", value
);
985 type
= block_default_type
;
989 cyls
= qemu_opt_get_number(legacy_opts
, "cyls", 0);
990 heads
= qemu_opt_get_number(legacy_opts
, "heads", 0);
991 secs
= qemu_opt_get_number(legacy_opts
, "secs", 0);
993 if (cyls
|| heads
|| secs
) {
995 error_report("invalid physical cyls number");
999 error_report("invalid physical heads number");
1003 error_report("invalid physical secs number");
1008 translation
= BIOS_ATA_TRANSLATION_AUTO
;
1009 value
= qemu_opt_get(legacy_opts
, "trans");
1010 if (value
!= NULL
) {
1012 error_report("'%s' trans must be used with cyls, heads and secs",
1016 if (!strcmp(value
, "none")) {
1017 translation
= BIOS_ATA_TRANSLATION_NONE
;
1018 } else if (!strcmp(value
, "lba")) {
1019 translation
= BIOS_ATA_TRANSLATION_LBA
;
1020 } else if (!strcmp(value
, "large")) {
1021 translation
= BIOS_ATA_TRANSLATION_LARGE
;
1022 } else if (!strcmp(value
, "rechs")) {
1023 translation
= BIOS_ATA_TRANSLATION_RECHS
;
1024 } else if (!strcmp(value
, "auto")) {
1025 translation
= BIOS_ATA_TRANSLATION_AUTO
;
1027 error_report("'%s' invalid translation type", value
);
1032 if (media
== MEDIA_CDROM
) {
1033 if (cyls
|| secs
|| heads
) {
1034 error_report("CHS can't be set with media=cdrom");
1039 /* Device address specified by bus/unit or index.
1040 * If none was specified, try to find the first free one. */
1041 bus_id
= qemu_opt_get_number(legacy_opts
, "bus", 0);
1042 unit_id
= qemu_opt_get_number(legacy_opts
, "unit", -1);
1043 index
= qemu_opt_get_number(legacy_opts
, "index", -1);
1045 max_devs
= if_max_devs
[type
];
1048 if (bus_id
!= 0 || unit_id
!= -1) {
1049 error_report("index cannot be used with bus and unit");
1052 bus_id
= drive_index_to_bus_id(type
, index
);
1053 unit_id
= drive_index_to_unit_id(type
, index
);
1056 if (unit_id
== -1) {
1058 while (drive_get(type
, bus_id
, unit_id
) != NULL
) {
1060 if (max_devs
&& unit_id
>= max_devs
) {
1061 unit_id
-= max_devs
;
1067 if (max_devs
&& unit_id
>= max_devs
) {
1068 error_report("unit %d too big (max is %d)", unit_id
, max_devs
- 1);
1072 if (drive_get(type
, bus_id
, unit_id
) != NULL
) {
1073 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1074 bus_id
, unit_id
, index
);
1079 serial
= qemu_opt_get(legacy_opts
, "serial");
1081 /* no id supplied -> create one */
1082 if (qemu_opts_id(all_opts
) == NULL
) {
1084 const char *mediastr
= "";
1085 if (type
== IF_IDE
|| type
== IF_SCSI
) {
1086 mediastr
= (media
== MEDIA_CDROM
) ? "-cd" : "-hd";
1089 new_id
= g_strdup_printf("%s%i%s%i", if_name
[type
], bus_id
,
1092 new_id
= g_strdup_printf("%s%s%i", if_name
[type
],
1095 qdict_put(bs_opts
, "id", qstring_from_str(new_id
));
1099 /* Add virtio block device */
1100 devaddr
= qemu_opt_get(legacy_opts
, "addr");
1101 if (devaddr
&& type
!= IF_VIRTIO
) {
1102 error_report("addr is not supported by this bus type");
1106 if (type
== IF_VIRTIO
) {
1108 devopts
= qemu_opts_create(qemu_find_opts("device"), NULL
, 0,
1110 if (arch_type
== QEMU_ARCH_S390X
) {
1111 qemu_opt_set(devopts
, "driver", "virtio-blk-ccw", &error_abort
);
1113 qemu_opt_set(devopts
, "driver", "virtio-blk-pci", &error_abort
);
1115 qemu_opt_set(devopts
, "drive", qdict_get_str(bs_opts
, "id"),
1118 qemu_opt_set(devopts
, "addr", devaddr
, &error_abort
);
1122 filename
= qemu_opt_get(legacy_opts
, "file");
1124 /* Check werror/rerror compatibility with if=... */
1125 werror
= qemu_opt_get(legacy_opts
, "werror");
1126 if (werror
!= NULL
) {
1127 if (type
!= IF_IDE
&& type
!= IF_SCSI
&& type
!= IF_VIRTIO
&&
1129 error_report("werror is not supported by this bus type");
1132 qdict_put(bs_opts
, "werror", qstring_from_str(werror
));
1135 rerror
= qemu_opt_get(legacy_opts
, "rerror");
1136 if (rerror
!= NULL
) {
1137 if (type
!= IF_IDE
&& type
!= IF_VIRTIO
&& type
!= IF_SCSI
&&
1139 error_report("rerror is not supported by this bus type");
1142 qdict_put(bs_opts
, "rerror", qstring_from_str(rerror
));
1145 /* Actual block device init: Functionality shared with blockdev-add */
1146 blk
= blockdev_init(filename
, bs_opts
, &local_err
);
1150 error_report_err(local_err
);
1157 /* Create legacy DriveInfo */
1158 dinfo
= g_malloc0(sizeof(*dinfo
));
1159 dinfo
->opts
= all_opts
;
1162 dinfo
->heads
= heads
;
1164 dinfo
->trans
= translation
;
1167 dinfo
->bus
= bus_id
;
1168 dinfo
->unit
= unit_id
;
1169 dinfo
->devaddr
= devaddr
;
1170 dinfo
->serial
= g_strdup(serial
);
1172 blk_set_legacy_dinfo(blk
, dinfo
);
1179 dinfo
->media_cd
= media
== MEDIA_CDROM
;
1186 qemu_opts_del(legacy_opts
);
1191 void hmp_commit(Monitor
*mon
, const QDict
*qdict
)
1193 const char *device
= qdict_get_str(qdict
, "device");
1197 if (!strcmp(device
, "all")) {
1198 ret
= blk_commit_all();
1200 BlockDriverState
*bs
;
1201 AioContext
*aio_context
;
1203 blk
= blk_by_name(device
);
1205 monitor_printf(mon
, "Device '%s' not found\n", device
);
1208 if (!blk_is_available(blk
)) {
1209 monitor_printf(mon
, "Device '%s' has no medium\n", device
);
1214 aio_context
= bdrv_get_aio_context(bs
);
1215 aio_context_acquire(aio_context
);
1217 ret
= bdrv_commit(bs
);
1219 aio_context_release(aio_context
);
1222 monitor_printf(mon
, "'commit' error for '%s': %s\n", device
,
1227 static void blockdev_do_action(TransactionAction
*action
, Error
**errp
)
1229 TransactionActionList list
;
1231 list
.value
= action
;
1233 qmp_transaction(&list
, false, NULL
, errp
);
1236 void qmp_blockdev_snapshot_sync(bool has_device
, const char *device
,
1237 bool has_node_name
, const char *node_name
,
1238 const char *snapshot_file
,
1239 bool has_snapshot_node_name
,
1240 const char *snapshot_node_name
,
1241 bool has_format
, const char *format
,
1242 bool has_mode
, NewImageMode mode
, Error
**errp
)
1244 BlockdevSnapshotSync snapshot
= {
1245 .has_device
= has_device
,
1246 .device
= (char *) device
,
1247 .has_node_name
= has_node_name
,
1248 .node_name
= (char *) node_name
,
1249 .snapshot_file
= (char *) snapshot_file
,
1250 .has_snapshot_node_name
= has_snapshot_node_name
,
1251 .snapshot_node_name
= (char *) snapshot_node_name
,
1252 .has_format
= has_format
,
1253 .format
= (char *) format
,
1254 .has_mode
= has_mode
,
1257 TransactionAction action
= {
1258 .type
= TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
,
1259 .u
.blockdev_snapshot_sync
.data
= &snapshot
,
1261 blockdev_do_action(&action
, errp
);
1264 void qmp_blockdev_snapshot(const char *node
, const char *overlay
,
1267 BlockdevSnapshot snapshot_data
= {
1268 .node
= (char *) node
,
1269 .overlay
= (char *) overlay
1271 TransactionAction action
= {
1272 .type
= TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT
,
1273 .u
.blockdev_snapshot
.data
= &snapshot_data
,
1275 blockdev_do_action(&action
, errp
);
1278 void qmp_blockdev_snapshot_internal_sync(const char *device
,
1282 BlockdevSnapshotInternal snapshot
= {
1283 .device
= (char *) device
,
1284 .name
= (char *) name
1286 TransactionAction action
= {
1287 .type
= TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
,
1288 .u
.blockdev_snapshot_internal_sync
.data
= &snapshot
,
1290 blockdev_do_action(&action
, errp
);
1293 SnapshotInfo
*qmp_blockdev_snapshot_delete_internal_sync(const char *device
,
1300 BlockDriverState
*bs
;
1302 AioContext
*aio_context
;
1303 QEMUSnapshotInfo sn
;
1304 Error
*local_err
= NULL
;
1305 SnapshotInfo
*info
= NULL
;
1308 blk
= blk_by_name(device
);
1310 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1311 "Device '%s' not found", device
);
1315 aio_context
= blk_get_aio_context(blk
);
1316 aio_context_acquire(aio_context
);
1327 error_setg(errp
, "Name or id must be provided");
1328 goto out_aio_context
;
1331 if (!blk_is_available(blk
)) {
1332 error_setg(errp
, "Device '%s' has no medium", device
);
1333 goto out_aio_context
;
1337 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE
, errp
)) {
1338 goto out_aio_context
;
1341 ret
= bdrv_snapshot_find_by_id_and_name(bs
, id
, name
, &sn
, &local_err
);
1343 error_propagate(errp
, local_err
);
1344 goto out_aio_context
;
1348 "Snapshot with id '%s' and name '%s' does not exist on "
1350 STR_OR_NULL(id
), STR_OR_NULL(name
), device
);
1351 goto out_aio_context
;
1354 bdrv_snapshot_delete(bs
, id
, name
, &local_err
);
1356 error_propagate(errp
, local_err
);
1357 goto out_aio_context
;
1360 aio_context_release(aio_context
);
1362 info
= g_new0(SnapshotInfo
, 1);
1363 info
->id
= g_strdup(sn
.id_str
);
1364 info
->name
= g_strdup(sn
.name
);
1365 info
->date_nsec
= sn
.date_nsec
;
1366 info
->date_sec
= sn
.date_sec
;
1367 info
->vm_state_size
= sn
.vm_state_size
;
1368 info
->vm_clock_nsec
= sn
.vm_clock_nsec
% 1000000000;
1369 info
->vm_clock_sec
= sn
.vm_clock_nsec
/ 1000000000;
1374 aio_context_release(aio_context
);
1379 * block_dirty_bitmap_lookup:
1380 * Return a dirty bitmap (if present), after validating
1381 * the node reference and bitmap names.
1383 * @node: The name of the BDS node to search for bitmaps
1384 * @name: The name of the bitmap to search for
1385 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1386 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1387 * @errp: Output pointer for error information. Can be NULL.
1389 * @return: A bitmap object on success, or NULL on failure.
1391 static BdrvDirtyBitmap
*block_dirty_bitmap_lookup(const char *node
,
1393 BlockDriverState
**pbs
,
1397 BlockDriverState
*bs
;
1398 BdrvDirtyBitmap
*bitmap
;
1399 AioContext
*aio_context
;
1402 error_setg(errp
, "Node cannot be NULL");
1406 error_setg(errp
, "Bitmap name cannot be NULL");
1409 bs
= bdrv_lookup_bs(node
, node
, NULL
);
1411 error_setg(errp
, "Node '%s' not found", node
);
1415 aio_context
= bdrv_get_aio_context(bs
);
1416 aio_context_acquire(aio_context
);
1418 bitmap
= bdrv_find_dirty_bitmap(bs
, name
);
1420 error_setg(errp
, "Dirty bitmap '%s' not found", name
);
1428 *paio
= aio_context
;
1430 aio_context_release(aio_context
);
1436 aio_context_release(aio_context
);
1440 /* New and old BlockDriverState structs for atomic group operations */
1442 typedef struct BlkActionState BlkActionState
;
1446 * Table of operations that define an Action.
1448 * @instance_size: Size of state struct, in bytes.
1449 * @prepare: Prepare the work, must NOT be NULL.
1450 * @commit: Commit the changes, can be NULL.
1451 * @abort: Abort the changes on fail, can be NULL.
1452 * @clean: Clean up resources after all transaction actions have called
1453 * commit() or abort(). Can be NULL.
1455 * Only prepare() may fail. In a single transaction, only one of commit() or
1456 * abort() will be called. clean() will always be called if it is present.
1458 typedef struct BlkActionOps
{
1459 size_t instance_size
;
1460 void (*prepare
)(BlkActionState
*common
, Error
**errp
);
1461 void (*commit
)(BlkActionState
*common
);
1462 void (*abort
)(BlkActionState
*common
);
1463 void (*clean
)(BlkActionState
*common
);
1468 * Describes one Action's state within a Transaction.
1470 * @action: QAPI-defined enum identifying which Action to perform.
1471 * @ops: Table of ActionOps this Action can perform.
1472 * @block_job_txn: Transaction which this action belongs to.
1473 * @entry: List membership for all Actions in this Transaction.
1475 * This structure must be arranged as first member in a subclassed type,
1476 * assuming that the compiler will also arrange it to the same offsets as the
1479 struct BlkActionState
{
1480 TransactionAction
*action
;
1481 const BlkActionOps
*ops
;
1482 BlockJobTxn
*block_job_txn
;
1483 TransactionProperties
*txn_props
;
1484 QSIMPLEQ_ENTRY(BlkActionState
) entry
;
1487 /* internal snapshot private data */
1488 typedef struct InternalSnapshotState
{
1489 BlkActionState common
;
1490 BlockDriverState
*bs
;
1491 AioContext
*aio_context
;
1492 QEMUSnapshotInfo sn
;
1494 } InternalSnapshotState
;
1497 static int action_check_completion_mode(BlkActionState
*s
, Error
**errp
)
1499 if (s
->txn_props
->completion_mode
!= ACTION_COMPLETION_MODE_INDIVIDUAL
) {
1501 "Action '%s' does not support Transaction property "
1502 "completion-mode = %s",
1503 TransactionActionKind_lookup
[s
->action
->type
],
1504 ActionCompletionMode_lookup
[s
->txn_props
->completion_mode
]);
1510 static void internal_snapshot_prepare(BlkActionState
*common
,
1513 Error
*local_err
= NULL
;
1517 BlockDriverState
*bs
;
1518 QEMUSnapshotInfo old_sn
, *sn
;
1521 BlockdevSnapshotInternal
*internal
;
1522 InternalSnapshotState
*state
;
1525 g_assert(common
->action
->type
==
1526 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
);
1527 internal
= common
->action
->u
.blockdev_snapshot_internal_sync
.data
;
1528 state
= DO_UPCAST(InternalSnapshotState
, common
, common
);
1530 /* 1. parse input */
1531 device
= internal
->device
;
1532 name
= internal
->name
;
1534 /* 2. check for validation */
1535 if (action_check_completion_mode(common
, errp
) < 0) {
1539 blk
= blk_by_name(device
);
1541 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1542 "Device '%s' not found", device
);
1546 /* AioContext is released in .clean() */
1547 state
->aio_context
= blk_get_aio_context(blk
);
1548 aio_context_acquire(state
->aio_context
);
1550 if (!blk_is_available(blk
)) {
1551 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1557 bdrv_drained_begin(bs
);
1559 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT
, errp
)) {
1563 if (bdrv_is_read_only(bs
)) {
1564 error_setg(errp
, "Device '%s' is read only", device
);
1568 if (!bdrv_can_snapshot(bs
)) {
1569 error_setg(errp
, "Block format '%s' used by device '%s' "
1570 "does not support internal snapshots",
1571 bs
->drv
->format_name
, device
);
1575 if (!strlen(name
)) {
1576 error_setg(errp
, "Name is empty");
1580 /* check whether a snapshot with name exist */
1581 ret
= bdrv_snapshot_find_by_id_and_name(bs
, NULL
, name
, &old_sn
,
1584 error_propagate(errp
, local_err
);
1588 "Snapshot with name '%s' already exists on device '%s'",
1593 /* 3. take the snapshot */
1595 pstrcpy(sn
->name
, sizeof(sn
->name
), name
);
1596 qemu_gettimeofday(&tv
);
1597 sn
->date_sec
= tv
.tv_sec
;
1598 sn
->date_nsec
= tv
.tv_usec
* 1000;
1599 sn
->vm_clock_nsec
= qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
);
1601 ret1
= bdrv_snapshot_create(bs
, sn
);
1603 error_setg_errno(errp
, -ret1
,
1604 "Failed to create snapshot '%s' on device '%s'",
1609 /* 4. succeed, mark a snapshot is created */
1610 state
->created
= true;
1613 static void internal_snapshot_abort(BlkActionState
*common
)
1615 InternalSnapshotState
*state
=
1616 DO_UPCAST(InternalSnapshotState
, common
, common
);
1617 BlockDriverState
*bs
= state
->bs
;
1618 QEMUSnapshotInfo
*sn
= &state
->sn
;
1619 Error
*local_error
= NULL
;
1621 if (!state
->created
) {
1625 if (bdrv_snapshot_delete(bs
, sn
->id_str
, sn
->name
, &local_error
) < 0) {
1626 error_reportf_err(local_error
,
1627 "Failed to delete snapshot with id '%s' and "
1628 "name '%s' on device '%s' in abort: ",
1629 sn
->id_str
, sn
->name
,
1630 bdrv_get_device_name(bs
));
1634 static void internal_snapshot_clean(BlkActionState
*common
)
1636 InternalSnapshotState
*state
= DO_UPCAST(InternalSnapshotState
,
1639 if (state
->aio_context
) {
1641 bdrv_drained_end(state
->bs
);
1643 aio_context_release(state
->aio_context
);
1647 /* external snapshot private data */
1648 typedef struct ExternalSnapshotState
{
1649 BlkActionState common
;
1650 BlockDriverState
*old_bs
;
1651 BlockDriverState
*new_bs
;
1652 AioContext
*aio_context
;
1653 } ExternalSnapshotState
;
1655 static void external_snapshot_prepare(BlkActionState
*common
,
1659 QDict
*options
= NULL
;
1660 Error
*local_err
= NULL
;
1661 /* Device and node name of the image to generate the snapshot from */
1663 const char *node_name
;
1664 /* Reference to the new image (for 'blockdev-snapshot') */
1665 const char *snapshot_ref
;
1666 /* File name of the new image (for 'blockdev-snapshot-sync') */
1667 const char *new_image_file
;
1668 ExternalSnapshotState
*state
=
1669 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1670 TransactionAction
*action
= common
->action
;
1672 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1673 * purpose but a different set of parameters */
1674 switch (action
->type
) {
1675 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT
:
1677 BlockdevSnapshot
*s
= action
->u
.blockdev_snapshot
.data
;
1679 node_name
= s
->node
;
1680 new_image_file
= NULL
;
1681 snapshot_ref
= s
->overlay
;
1684 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
:
1686 BlockdevSnapshotSync
*s
= action
->u
.blockdev_snapshot_sync
.data
;
1687 device
= s
->has_device
? s
->device
: NULL
;
1688 node_name
= s
->has_node_name
? s
->node_name
: NULL
;
1689 new_image_file
= s
->snapshot_file
;
1690 snapshot_ref
= NULL
;
1694 g_assert_not_reached();
1697 /* start processing */
1698 if (action_check_completion_mode(common
, errp
) < 0) {
1702 state
->old_bs
= bdrv_lookup_bs(device
, node_name
, errp
);
1703 if (!state
->old_bs
) {
1707 /* Acquire AioContext now so any threads operating on old_bs stop */
1708 state
->aio_context
= bdrv_get_aio_context(state
->old_bs
);
1709 aio_context_acquire(state
->aio_context
);
1710 bdrv_drained_begin(state
->old_bs
);
1712 if (!bdrv_is_inserted(state
->old_bs
)) {
1713 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1717 if (bdrv_op_is_blocked(state
->old_bs
,
1718 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
, errp
)) {
1722 if (!bdrv_is_read_only(state
->old_bs
)) {
1723 if (bdrv_flush(state
->old_bs
)) {
1724 error_setg(errp
, QERR_IO_ERROR
);
1729 if (!bdrv_is_first_non_filter(state
->old_bs
)) {
1730 error_setg(errp
, QERR_FEATURE_DISABLED
, "snapshot");
1734 if (action
->type
== TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
) {
1735 BlockdevSnapshotSync
*s
= action
->u
.blockdev_snapshot_sync
.data
;
1736 const char *format
= s
->has_format
? s
->format
: "qcow2";
1737 enum NewImageMode mode
;
1738 const char *snapshot_node_name
=
1739 s
->has_snapshot_node_name
? s
->snapshot_node_name
: NULL
;
1741 if (node_name
&& !snapshot_node_name
) {
1742 error_setg(errp
, "New snapshot node name missing");
1746 if (snapshot_node_name
&&
1747 bdrv_lookup_bs(snapshot_node_name
, snapshot_node_name
, NULL
)) {
1748 error_setg(errp
, "New snapshot node name already in use");
1752 flags
= state
->old_bs
->open_flags
;
1753 flags
&= ~(BDRV_O_SNAPSHOT
| BDRV_O_NO_BACKING
| BDRV_O_COPY_ON_READ
);
1755 /* create new image w/backing file */
1756 mode
= s
->has_mode
? s
->mode
: NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
1757 if (mode
!= NEW_IMAGE_MODE_EXISTING
) {
1758 int64_t size
= bdrv_getlength(state
->old_bs
);
1760 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
1763 bdrv_img_create(new_image_file
, format
,
1764 state
->old_bs
->filename
,
1765 state
->old_bs
->drv
->format_name
,
1766 NULL
, size
, flags
, &local_err
, false);
1768 error_propagate(errp
, local_err
);
1773 options
= qdict_new();
1774 if (s
->has_snapshot_node_name
) {
1775 qdict_put(options
, "node-name",
1776 qstring_from_str(snapshot_node_name
));
1778 qdict_put(options
, "driver", qstring_from_str(format
));
1780 flags
|= BDRV_O_NO_BACKING
;
1783 assert(state
->new_bs
== NULL
);
1784 ret
= bdrv_open(&state
->new_bs
, new_image_file
, snapshot_ref
, options
,
1786 /* We will manually add the backing_hd field to the bs later */
1791 if (state
->new_bs
->blk
!= NULL
) {
1792 error_setg(errp
, "The snapshot is already in use by %s",
1793 blk_name(state
->new_bs
->blk
));
1797 if (bdrv_op_is_blocked(state
->new_bs
, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
,
1802 if (state
->new_bs
->backing
!= NULL
) {
1803 error_setg(errp
, "The snapshot already has a backing image");
1807 if (!state
->new_bs
->drv
->supports_backing
) {
1808 error_setg(errp
, "The snapshot does not support backing images");
1812 static void external_snapshot_commit(BlkActionState
*common
)
1814 ExternalSnapshotState
*state
=
1815 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1817 bdrv_set_aio_context(state
->new_bs
, state
->aio_context
);
1819 /* This removes our old bs and adds the new bs */
1820 bdrv_append(state
->new_bs
, state
->old_bs
);
1821 /* We don't need (or want) to use the transactional
1822 * bdrv_reopen_multiple() across all the entries at once, because we
1823 * don't want to abort all of them if one of them fails the reopen */
1824 if (!state
->old_bs
->copy_on_read
) {
1825 bdrv_reopen(state
->old_bs
, state
->old_bs
->open_flags
& ~BDRV_O_RDWR
,
1830 static void external_snapshot_abort(BlkActionState
*common
)
1832 ExternalSnapshotState
*state
=
1833 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1834 if (state
->new_bs
) {
1835 bdrv_unref(state
->new_bs
);
1839 static void external_snapshot_clean(BlkActionState
*common
)
1841 ExternalSnapshotState
*state
=
1842 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1843 if (state
->aio_context
) {
1844 bdrv_drained_end(state
->old_bs
);
1845 aio_context_release(state
->aio_context
);
1849 typedef struct DriveBackupState
{
1850 BlkActionState common
;
1851 BlockDriverState
*bs
;
1852 AioContext
*aio_context
;
1856 static void do_drive_backup(const char *device
, const char *target
,
1857 bool has_format
, const char *format
,
1858 enum MirrorSyncMode sync
,
1859 bool has_mode
, enum NewImageMode mode
,
1860 bool has_speed
, int64_t speed
,
1861 bool has_bitmap
, const char *bitmap
,
1862 bool has_on_source_error
,
1863 BlockdevOnError on_source_error
,
1864 bool has_on_target_error
,
1865 BlockdevOnError on_target_error
,
1866 BlockJobTxn
*txn
, Error
**errp
);
1868 static void drive_backup_prepare(BlkActionState
*common
, Error
**errp
)
1870 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1872 DriveBackup
*backup
;
1873 Error
*local_err
= NULL
;
1875 assert(common
->action
->type
== TRANSACTION_ACTION_KIND_DRIVE_BACKUP
);
1876 backup
= common
->action
->u
.drive_backup
.data
;
1878 blk
= blk_by_name(backup
->device
);
1880 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1881 "Device '%s' not found", backup
->device
);
1885 if (!blk_is_available(blk
)) {
1886 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, backup
->device
);
1890 /* AioContext is released in .clean() */
1891 state
->aio_context
= blk_get_aio_context(blk
);
1892 aio_context_acquire(state
->aio_context
);
1893 bdrv_drained_begin(blk_bs(blk
));
1894 state
->bs
= blk_bs(blk
);
1896 do_drive_backup(backup
->device
, backup
->target
,
1897 backup
->has_format
, backup
->format
,
1899 backup
->has_mode
, backup
->mode
,
1900 backup
->has_speed
, backup
->speed
,
1901 backup
->has_bitmap
, backup
->bitmap
,
1902 backup
->has_on_source_error
, backup
->on_source_error
,
1903 backup
->has_on_target_error
, backup
->on_target_error
,
1904 common
->block_job_txn
, &local_err
);
1906 error_propagate(errp
, local_err
);
1910 state
->job
= state
->bs
->job
;
1913 static void drive_backup_abort(BlkActionState
*common
)
1915 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1916 BlockDriverState
*bs
= state
->bs
;
1918 /* Only cancel if it's the job we started */
1919 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
1920 block_job_cancel_sync(bs
->job
);
1924 static void drive_backup_clean(BlkActionState
*common
)
1926 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1928 if (state
->aio_context
) {
1929 bdrv_drained_end(state
->bs
);
1930 aio_context_release(state
->aio_context
);
1934 typedef struct BlockdevBackupState
{
1935 BlkActionState common
;
1936 BlockDriverState
*bs
;
1938 AioContext
*aio_context
;
1939 } BlockdevBackupState
;
1941 static void do_blockdev_backup(const char *device
, const char *target
,
1942 enum MirrorSyncMode sync
,
1943 bool has_speed
, int64_t speed
,
1944 bool has_on_source_error
,
1945 BlockdevOnError on_source_error
,
1946 bool has_on_target_error
,
1947 BlockdevOnError on_target_error
,
1948 BlockJobTxn
*txn
, Error
**errp
);
1950 static void blockdev_backup_prepare(BlkActionState
*common
, Error
**errp
)
1952 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1953 BlockdevBackup
*backup
;
1954 BlockBackend
*blk
, *target
;
1955 Error
*local_err
= NULL
;
1957 assert(common
->action
->type
== TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP
);
1958 backup
= common
->action
->u
.blockdev_backup
.data
;
1960 blk
= blk_by_name(backup
->device
);
1962 error_setg(errp
, "Device '%s' not found", backup
->device
);
1966 if (!blk_is_available(blk
)) {
1967 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, backup
->device
);
1971 target
= blk_by_name(backup
->target
);
1973 error_setg(errp
, "Device '%s' not found", backup
->target
);
1977 /* AioContext is released in .clean() */
1978 state
->aio_context
= blk_get_aio_context(blk
);
1979 if (state
->aio_context
!= blk_get_aio_context(target
)) {
1980 state
->aio_context
= NULL
;
1981 error_setg(errp
, "Backup between two IO threads is not implemented");
1984 aio_context_acquire(state
->aio_context
);
1985 state
->bs
= blk_bs(blk
);
1986 bdrv_drained_begin(state
->bs
);
1988 do_blockdev_backup(backup
->device
, backup
->target
,
1990 backup
->has_speed
, backup
->speed
,
1991 backup
->has_on_source_error
, backup
->on_source_error
,
1992 backup
->has_on_target_error
, backup
->on_target_error
,
1993 common
->block_job_txn
, &local_err
);
1995 error_propagate(errp
, local_err
);
1999 state
->job
= state
->bs
->job
;
2002 static void blockdev_backup_abort(BlkActionState
*common
)
2004 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
2005 BlockDriverState
*bs
= state
->bs
;
2007 /* Only cancel if it's the job we started */
2008 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
2009 block_job_cancel_sync(bs
->job
);
2013 static void blockdev_backup_clean(BlkActionState
*common
)
2015 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
2017 if (state
->aio_context
) {
2018 bdrv_drained_end(state
->bs
);
2019 aio_context_release(state
->aio_context
);
2023 typedef struct BlockDirtyBitmapState
{
2024 BlkActionState common
;
2025 BdrvDirtyBitmap
*bitmap
;
2026 BlockDriverState
*bs
;
2027 AioContext
*aio_context
;
2030 } BlockDirtyBitmapState
;
2032 static void block_dirty_bitmap_add_prepare(BlkActionState
*common
,
2035 Error
*local_err
= NULL
;
2036 BlockDirtyBitmapAdd
*action
;
2037 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2040 if (action_check_completion_mode(common
, errp
) < 0) {
2044 action
= common
->action
->u
.block_dirty_bitmap_add
.data
;
2045 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2046 qmp_block_dirty_bitmap_add(action
->node
, action
->name
,
2047 action
->has_granularity
, action
->granularity
,
2051 state
->prepared
= true;
2053 error_propagate(errp
, local_err
);
2057 static void block_dirty_bitmap_add_abort(BlkActionState
*common
)
2059 BlockDirtyBitmapAdd
*action
;
2060 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2063 action
= common
->action
->u
.block_dirty_bitmap_add
.data
;
2064 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2065 * then the node reference and bitmap name must have been valid.
2067 if (state
->prepared
) {
2068 qmp_block_dirty_bitmap_remove(action
->node
, action
->name
, &error_abort
);
2072 static void block_dirty_bitmap_clear_prepare(BlkActionState
*common
,
2075 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2077 BlockDirtyBitmap
*action
;
2079 if (action_check_completion_mode(common
, errp
) < 0) {
2083 action
= common
->action
->u
.block_dirty_bitmap_clear
.data
;
2084 state
->bitmap
= block_dirty_bitmap_lookup(action
->node
,
2087 &state
->aio_context
,
2089 if (!state
->bitmap
) {
2093 if (bdrv_dirty_bitmap_frozen(state
->bitmap
)) {
2094 error_setg(errp
, "Cannot modify a frozen bitmap");
2096 } else if (!bdrv_dirty_bitmap_enabled(state
->bitmap
)) {
2097 error_setg(errp
, "Cannot clear a disabled bitmap");
2101 bdrv_clear_dirty_bitmap(state
->bitmap
, &state
->backup
);
2102 /* AioContext is released in .clean() */
2105 static void block_dirty_bitmap_clear_abort(BlkActionState
*common
)
2107 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2110 bdrv_undo_clear_dirty_bitmap(state
->bitmap
, state
->backup
);
2113 static void block_dirty_bitmap_clear_commit(BlkActionState
*common
)
2115 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2118 hbitmap_free(state
->backup
);
2121 static void block_dirty_bitmap_clear_clean(BlkActionState
*common
)
2123 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2126 if (state
->aio_context
) {
2127 aio_context_release(state
->aio_context
);
2131 static void abort_prepare(BlkActionState
*common
, Error
**errp
)
2133 error_setg(errp
, "Transaction aborted using Abort action");
2136 static void abort_commit(BlkActionState
*common
)
2138 g_assert_not_reached(); /* this action never succeeds */
2141 static const BlkActionOps actions
[] = {
2142 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT
] = {
2143 .instance_size
= sizeof(ExternalSnapshotState
),
2144 .prepare
= external_snapshot_prepare
,
2145 .commit
= external_snapshot_commit
,
2146 .abort
= external_snapshot_abort
,
2147 .clean
= external_snapshot_clean
,
2149 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
] = {
2150 .instance_size
= sizeof(ExternalSnapshotState
),
2151 .prepare
= external_snapshot_prepare
,
2152 .commit
= external_snapshot_commit
,
2153 .abort
= external_snapshot_abort
,
2154 .clean
= external_snapshot_clean
,
2156 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP
] = {
2157 .instance_size
= sizeof(DriveBackupState
),
2158 .prepare
= drive_backup_prepare
,
2159 .abort
= drive_backup_abort
,
2160 .clean
= drive_backup_clean
,
2162 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP
] = {
2163 .instance_size
= sizeof(BlockdevBackupState
),
2164 .prepare
= blockdev_backup_prepare
,
2165 .abort
= blockdev_backup_abort
,
2166 .clean
= blockdev_backup_clean
,
2168 [TRANSACTION_ACTION_KIND_ABORT
] = {
2169 .instance_size
= sizeof(BlkActionState
),
2170 .prepare
= abort_prepare
,
2171 .commit
= abort_commit
,
2173 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
] = {
2174 .instance_size
= sizeof(InternalSnapshotState
),
2175 .prepare
= internal_snapshot_prepare
,
2176 .abort
= internal_snapshot_abort
,
2177 .clean
= internal_snapshot_clean
,
2179 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD
] = {
2180 .instance_size
= sizeof(BlockDirtyBitmapState
),
2181 .prepare
= block_dirty_bitmap_add_prepare
,
2182 .abort
= block_dirty_bitmap_add_abort
,
2184 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR
] = {
2185 .instance_size
= sizeof(BlockDirtyBitmapState
),
2186 .prepare
= block_dirty_bitmap_clear_prepare
,
2187 .commit
= block_dirty_bitmap_clear_commit
,
2188 .abort
= block_dirty_bitmap_clear_abort
,
2189 .clean
= block_dirty_bitmap_clear_clean
,
2194 * Allocate a TransactionProperties structure if necessary, and fill
2195 * that structure with desired defaults if they are unset.
2197 static TransactionProperties
*get_transaction_properties(
2198 TransactionProperties
*props
)
2201 props
= g_new0(TransactionProperties
, 1);
2204 if (!props
->has_completion_mode
) {
2205 props
->has_completion_mode
= true;
2206 props
->completion_mode
= ACTION_COMPLETION_MODE_INDIVIDUAL
;
2213 * 'Atomic' group operations. The operations are performed as a set, and if
2214 * any fail then we roll back all operations in the group.
2216 void qmp_transaction(TransactionActionList
*dev_list
,
2218 struct TransactionProperties
*props
,
2221 TransactionActionList
*dev_entry
= dev_list
;
2222 BlockJobTxn
*block_job_txn
= NULL
;
2223 BlkActionState
*state
, *next
;
2224 Error
*local_err
= NULL
;
2226 QSIMPLEQ_HEAD(snap_bdrv_states
, BlkActionState
) snap_bdrv_states
;
2227 QSIMPLEQ_INIT(&snap_bdrv_states
);
2229 /* Does this transaction get canceled as a group on failure?
2230 * If not, we don't really need to make a BlockJobTxn.
2232 props
= get_transaction_properties(props
);
2233 if (props
->completion_mode
!= ACTION_COMPLETION_MODE_INDIVIDUAL
) {
2234 block_job_txn
= block_job_txn_new();
2237 /* drain all i/o before any operations */
2240 /* We don't do anything in this loop that commits us to the operations */
2241 while (NULL
!= dev_entry
) {
2242 TransactionAction
*dev_info
= NULL
;
2243 const BlkActionOps
*ops
;
2245 dev_info
= dev_entry
->value
;
2246 dev_entry
= dev_entry
->next
;
2248 assert(dev_info
->type
< ARRAY_SIZE(actions
));
2250 ops
= &actions
[dev_info
->type
];
2251 assert(ops
->instance_size
> 0);
2253 state
= g_malloc0(ops
->instance_size
);
2255 state
->action
= dev_info
;
2256 state
->block_job_txn
= block_job_txn
;
2257 state
->txn_props
= props
;
2258 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states
, state
, entry
);
2260 state
->ops
->prepare(state
, &local_err
);
2262 error_propagate(errp
, local_err
);
2263 goto delete_and_fail
;
2267 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
2268 if (state
->ops
->commit
) {
2269 state
->ops
->commit(state
);
2277 /* failure, and it is all-or-none; roll back all operations */
2278 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
2279 if (state
->ops
->abort
) {
2280 state
->ops
->abort(state
);
2284 QSIMPLEQ_FOREACH_SAFE(state
, &snap_bdrv_states
, entry
, next
) {
2285 if (state
->ops
->clean
) {
2286 state
->ops
->clean(state
);
2291 qapi_free_TransactionProperties(props
);
2293 block_job_txn_unref(block_job_txn
);
2296 void qmp_eject(const char *device
, bool has_force
, bool force
, Error
**errp
)
2298 Error
*local_err
= NULL
;
2300 qmp_blockdev_open_tray(device
, has_force
, force
, &local_err
);
2302 error_propagate(errp
, local_err
);
2306 qmp_x_blockdev_remove_medium(device
, errp
);
2309 void qmp_block_passwd(bool has_device
, const char *device
,
2310 bool has_node_name
, const char *node_name
,
2311 const char *password
, Error
**errp
)
2313 Error
*local_err
= NULL
;
2314 BlockDriverState
*bs
;
2315 AioContext
*aio_context
;
2317 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
2318 has_node_name
? node_name
: NULL
,
2321 error_propagate(errp
, local_err
);
2325 aio_context
= bdrv_get_aio_context(bs
);
2326 aio_context_acquire(aio_context
);
2328 bdrv_add_key(bs
, password
, errp
);
2330 aio_context_release(aio_context
);
2333 void qmp_blockdev_open_tray(const char *device
, bool has_force
, bool force
,
2343 blk
= blk_by_name(device
);
2345 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2346 "Device '%s' not found", device
);
2350 if (!blk_dev_has_removable_media(blk
)) {
2351 error_setg(errp
, "Device '%s' is not removable", device
);
2355 if (!blk_dev_has_tray(blk
)) {
2356 /* Ignore this command on tray-less devices */
2360 if (blk_dev_is_tray_open(blk
)) {
2364 locked
= blk_dev_is_medium_locked(blk
);
2366 blk_dev_eject_request(blk
, force
);
2369 if (!locked
|| force
) {
2370 blk_dev_change_media_cb(blk
, false);
2374 void qmp_blockdev_close_tray(const char *device
, Error
**errp
)
2378 blk
= blk_by_name(device
);
2380 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2381 "Device '%s' not found", device
);
2385 if (!blk_dev_has_removable_media(blk
)) {
2386 error_setg(errp
, "Device '%s' is not removable", device
);
2390 if (!blk_dev_has_tray(blk
)) {
2391 /* Ignore this command on tray-less devices */
2395 if (!blk_dev_is_tray_open(blk
)) {
2399 blk_dev_change_media_cb(blk
, true);
2402 void qmp_x_blockdev_remove_medium(const char *device
, Error
**errp
)
2405 BlockDriverState
*bs
;
2406 AioContext
*aio_context
;
2409 blk
= blk_by_name(device
);
2411 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2412 "Device '%s' not found", device
);
2416 /* For BBs without a device, we can exchange the BDS tree at will */
2417 has_device
= blk_get_attached_dev(blk
);
2419 if (has_device
&& !blk_dev_has_removable_media(blk
)) {
2420 error_setg(errp
, "Device '%s' is not removable", device
);
2424 if (has_device
&& blk_dev_has_tray(blk
) && !blk_dev_is_tray_open(blk
)) {
2425 error_setg(errp
, "Tray of device '%s' is not open", device
);
2434 aio_context
= bdrv_get_aio_context(bs
);
2435 aio_context_acquire(aio_context
);
2437 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_EJECT
, errp
)) {
2443 if (!blk_dev_has_tray(blk
)) {
2444 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2445 * called at all); therefore, the medium needs to be ejected here.
2446 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2447 * value passed here (i.e. false). */
2448 blk_dev_change_media_cb(blk
, false);
2452 aio_context_release(aio_context
);
2455 static void qmp_blockdev_insert_anon_medium(const char *device
,
2456 BlockDriverState
*bs
, Error
**errp
)
2461 blk
= blk_by_name(device
);
2463 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2464 "Device '%s' not found", device
);
2468 /* For BBs without a device, we can exchange the BDS tree at will */
2469 has_device
= blk_get_attached_dev(blk
);
2471 if (has_device
&& !blk_dev_has_removable_media(blk
)) {
2472 error_setg(errp
, "Device '%s' is not removable", device
);
2476 if (has_device
&& blk_dev_has_tray(blk
) && !blk_dev_is_tray_open(blk
)) {
2477 error_setg(errp
, "Tray of device '%s' is not open", device
);
2482 error_setg(errp
, "There already is a medium in device '%s'", device
);
2486 blk_insert_bs(blk
, bs
);
2488 if (!blk_dev_has_tray(blk
)) {
2489 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2490 * called at all); therefore, the medium needs to be pushed into the
2492 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2493 * value passed here (i.e. true). */
2494 blk_dev_change_media_cb(blk
, true);
2498 void qmp_x_blockdev_insert_medium(const char *device
, const char *node_name
,
2501 BlockDriverState
*bs
;
2503 bs
= bdrv_find_node(node_name
);
2505 error_setg(errp
, "Node '%s' not found", node_name
);
2510 error_setg(errp
, "Node '%s' is already in use by '%s'", node_name
,
2515 qmp_blockdev_insert_anon_medium(device
, bs
, errp
);
2518 void qmp_blockdev_change_medium(const char *device
, const char *filename
,
2519 bool has_format
, const char *format
,
2521 BlockdevChangeReadOnlyMode read_only
,
2525 BlockDriverState
*medium_bs
= NULL
;
2526 int bdrv_flags
, ret
;
2527 QDict
*options
= NULL
;
2530 blk
= blk_by_name(device
);
2532 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2533 "Device '%s' not found", device
);
2538 blk_update_root_state(blk
);
2541 bdrv_flags
= blk_get_open_flags_from_root_state(blk
);
2542 bdrv_flags
&= ~(BDRV_O_TEMPORARY
| BDRV_O_SNAPSHOT
| BDRV_O_NO_BACKING
|
2545 if (!has_read_only
) {
2546 read_only
= BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN
;
2549 switch (read_only
) {
2550 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN
:
2553 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY
:
2554 bdrv_flags
&= ~BDRV_O_RDWR
;
2557 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE
:
2558 bdrv_flags
|= BDRV_O_RDWR
;
2566 options
= qdict_new();
2567 qdict_put(options
, "driver", qstring_from_str(format
));
2571 ret
= bdrv_open(&medium_bs
, filename
, NULL
, options
, bdrv_flags
, errp
);
2576 blk_apply_root_state(blk
, medium_bs
);
2578 bdrv_add_key(medium_bs
, NULL
, &err
);
2580 error_propagate(errp
, err
);
2584 qmp_blockdev_open_tray(device
, false, false, &err
);
2586 error_propagate(errp
, err
);
2590 qmp_x_blockdev_remove_medium(device
, &err
);
2592 error_propagate(errp
, err
);
2596 qmp_blockdev_insert_anon_medium(device
, medium_bs
, &err
);
2598 error_propagate(errp
, err
);
2602 qmp_blockdev_close_tray(device
, errp
);
2605 /* If the medium has been inserted, the device has its own reference, so
2606 * ours must be relinquished; and if it has not been inserted successfully,
2607 * the reference must be relinquished anyway */
2608 bdrv_unref(medium_bs
);
2611 /* throttling disk I/O limits */
2612 void qmp_block_set_io_throttle(const char *device
, int64_t bps
, int64_t bps_rd
,
2619 bool has_bps_rd_max
,
2621 bool has_bps_wr_max
,
2625 bool has_iops_rd_max
,
2626 int64_t iops_rd_max
,
2627 bool has_iops_wr_max
,
2628 int64_t iops_wr_max
,
2629 bool has_bps_max_length
,
2630 int64_t bps_max_length
,
2631 bool has_bps_rd_max_length
,
2632 int64_t bps_rd_max_length
,
2633 bool has_bps_wr_max_length
,
2634 int64_t bps_wr_max_length
,
2635 bool has_iops_max_length
,
2636 int64_t iops_max_length
,
2637 bool has_iops_rd_max_length
,
2638 int64_t iops_rd_max_length
,
2639 bool has_iops_wr_max_length
,
2640 int64_t iops_wr_max_length
,
2644 const char *group
, Error
**errp
)
2647 BlockDriverState
*bs
;
2649 AioContext
*aio_context
;
2651 blk
= blk_by_name(device
);
2653 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2654 "Device '%s' not found", device
);
2658 aio_context
= blk_get_aio_context(blk
);
2659 aio_context_acquire(aio_context
);
2663 error_setg(errp
, "Device '%s' has no medium", device
);
2667 /* The BlockBackend must be the only parent */
2668 assert(QLIST_FIRST(&bs
->parents
));
2669 if (QLIST_NEXT(QLIST_FIRST(&bs
->parents
), next_parent
)) {
2670 error_setg(errp
, "Cannot throttle device with multiple parents");
2674 throttle_config_init(&cfg
);
2675 cfg
.buckets
[THROTTLE_BPS_TOTAL
].avg
= bps
;
2676 cfg
.buckets
[THROTTLE_BPS_READ
].avg
= bps_rd
;
2677 cfg
.buckets
[THROTTLE_BPS_WRITE
].avg
= bps_wr
;
2679 cfg
.buckets
[THROTTLE_OPS_TOTAL
].avg
= iops
;
2680 cfg
.buckets
[THROTTLE_OPS_READ
].avg
= iops_rd
;
2681 cfg
.buckets
[THROTTLE_OPS_WRITE
].avg
= iops_wr
;
2684 cfg
.buckets
[THROTTLE_BPS_TOTAL
].max
= bps_max
;
2686 if (has_bps_rd_max
) {
2687 cfg
.buckets
[THROTTLE_BPS_READ
].max
= bps_rd_max
;
2689 if (has_bps_wr_max
) {
2690 cfg
.buckets
[THROTTLE_BPS_WRITE
].max
= bps_wr_max
;
2693 cfg
.buckets
[THROTTLE_OPS_TOTAL
].max
= iops_max
;
2695 if (has_iops_rd_max
) {
2696 cfg
.buckets
[THROTTLE_OPS_READ
].max
= iops_rd_max
;
2698 if (has_iops_wr_max
) {
2699 cfg
.buckets
[THROTTLE_OPS_WRITE
].max
= iops_wr_max
;
2702 if (has_bps_max_length
) {
2703 cfg
.buckets
[THROTTLE_BPS_TOTAL
].burst_length
= bps_max_length
;
2705 if (has_bps_rd_max_length
) {
2706 cfg
.buckets
[THROTTLE_BPS_READ
].burst_length
= bps_rd_max_length
;
2708 if (has_bps_wr_max_length
) {
2709 cfg
.buckets
[THROTTLE_BPS_WRITE
].burst_length
= bps_wr_max_length
;
2711 if (has_iops_max_length
) {
2712 cfg
.buckets
[THROTTLE_OPS_TOTAL
].burst_length
= iops_max_length
;
2714 if (has_iops_rd_max_length
) {
2715 cfg
.buckets
[THROTTLE_OPS_READ
].burst_length
= iops_rd_max_length
;
2717 if (has_iops_wr_max_length
) {
2718 cfg
.buckets
[THROTTLE_OPS_WRITE
].burst_length
= iops_wr_max_length
;
2721 if (has_iops_size
) {
2722 cfg
.op_size
= iops_size
;
2725 if (!throttle_is_valid(&cfg
, errp
)) {
2729 if (throttle_enabled(&cfg
)) {
2730 /* Enable I/O limits if they're not enabled yet, otherwise
2731 * just update the throttling group. */
2732 if (!bs
->throttle_state
) {
2733 bdrv_io_limits_enable(bs
, has_group
? group
: device
);
2734 } else if (has_group
) {
2735 bdrv_io_limits_update_group(bs
, group
);
2737 /* Set the new throttling configuration */
2738 bdrv_set_io_limits(bs
, &cfg
);
2739 } else if (bs
->throttle_state
) {
2740 /* If all throttling settings are set to 0, disable I/O limits */
2741 bdrv_io_limits_disable(bs
);
2745 aio_context_release(aio_context
);
2748 void qmp_block_dirty_bitmap_add(const char *node
, const char *name
,
2749 bool has_granularity
, uint32_t granularity
,
2752 AioContext
*aio_context
;
2753 BlockDriverState
*bs
;
2755 if (!name
|| name
[0] == '\0') {
2756 error_setg(errp
, "Bitmap name cannot be empty");
2760 bs
= bdrv_lookup_bs(node
, node
, errp
);
2765 aio_context
= bdrv_get_aio_context(bs
);
2766 aio_context_acquire(aio_context
);
2768 if (has_granularity
) {
2769 if (granularity
< 512 || !is_power_of_2(granularity
)) {
2770 error_setg(errp
, "Granularity must be power of 2 "
2771 "and at least 512");
2775 /* Default to cluster size, if available: */
2776 granularity
= bdrv_get_default_bitmap_granularity(bs
);
2779 bdrv_create_dirty_bitmap(bs
, granularity
, name
, errp
);
2782 aio_context_release(aio_context
);
2785 void qmp_block_dirty_bitmap_remove(const char *node
, const char *name
,
2788 AioContext
*aio_context
;
2789 BlockDriverState
*bs
;
2790 BdrvDirtyBitmap
*bitmap
;
2792 bitmap
= block_dirty_bitmap_lookup(node
, name
, &bs
, &aio_context
, errp
);
2793 if (!bitmap
|| !bs
) {
2797 if (bdrv_dirty_bitmap_frozen(bitmap
)) {
2799 "Bitmap '%s' is currently frozen and cannot be removed",
2803 bdrv_dirty_bitmap_make_anon(bitmap
);
2804 bdrv_release_dirty_bitmap(bs
, bitmap
);
2807 aio_context_release(aio_context
);
2811 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2812 * immediately after a full backup operation.
2814 void qmp_block_dirty_bitmap_clear(const char *node
, const char *name
,
2817 AioContext
*aio_context
;
2818 BdrvDirtyBitmap
*bitmap
;
2819 BlockDriverState
*bs
;
2821 bitmap
= block_dirty_bitmap_lookup(node
, name
, &bs
, &aio_context
, errp
);
2822 if (!bitmap
|| !bs
) {
2826 if (bdrv_dirty_bitmap_frozen(bitmap
)) {
2828 "Bitmap '%s' is currently frozen and cannot be modified",
2831 } else if (!bdrv_dirty_bitmap_enabled(bitmap
)) {
2833 "Bitmap '%s' is currently disabled and cannot be cleared",
2838 bdrv_clear_dirty_bitmap(bitmap
, NULL
);
2841 aio_context_release(aio_context
);
2844 void hmp_drive_del(Monitor
*mon
, const QDict
*qdict
)
2846 const char *id
= qdict_get_str(qdict
, "id");
2848 BlockDriverState
*bs
;
2849 AioContext
*aio_context
;
2850 Error
*local_err
= NULL
;
2852 bs
= bdrv_find_node(id
);
2854 qmp_x_blockdev_del(false, NULL
, true, id
, &local_err
);
2856 error_report_err(local_err
);
2861 blk
= blk_by_name(id
);
2863 error_report("Device '%s' not found", id
);
2867 if (!blk_legacy_dinfo(blk
)) {
2868 error_report("Deleting device added with blockdev-add"
2869 " is not supported");
2873 aio_context
= blk_get_aio_context(blk
);
2874 aio_context_acquire(aio_context
);
2878 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_DRIVE_DEL
, &local_err
)) {
2879 error_report_err(local_err
);
2880 aio_context_release(aio_context
);
2887 /* Make the BlockBackend and the attached BlockDriverState anonymous */
2888 monitor_remove_blk(blk
);
2890 /* If this BlockBackend has a device attached to it, its refcount will be
2891 * decremented when the device is removed; otherwise we have to do so here.
2893 if (blk_get_attached_dev(blk
)) {
2894 /* Further I/O must not pause the guest */
2895 blk_set_on_error(blk
, BLOCKDEV_ON_ERROR_REPORT
,
2896 BLOCKDEV_ON_ERROR_REPORT
);
2901 aio_context_release(aio_context
);
2904 void qmp_block_resize(bool has_device
, const char *device
,
2905 bool has_node_name
, const char *node_name
,
2906 int64_t size
, Error
**errp
)
2908 Error
*local_err
= NULL
;
2909 BlockDriverState
*bs
;
2910 AioContext
*aio_context
;
2913 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
2914 has_node_name
? node_name
: NULL
,
2917 error_propagate(errp
, local_err
);
2921 aio_context
= bdrv_get_aio_context(bs
);
2922 aio_context_acquire(aio_context
);
2924 if (!bdrv_is_first_non_filter(bs
)) {
2925 error_setg(errp
, QERR_FEATURE_DISABLED
, "resize");
2930 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "size", "a >0 size");
2934 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_RESIZE
, NULL
)) {
2935 error_setg(errp
, QERR_DEVICE_IN_USE
, device
);
2939 /* complete all in-flight operations before resizing the device */
2942 ret
= bdrv_truncate(bs
, size
);
2947 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
2950 error_setg(errp
, QERR_UNSUPPORTED
);
2953 error_setg(errp
, "Device '%s' is read only", device
);
2956 error_setg(errp
, QERR_DEVICE_IN_USE
, device
);
2959 error_setg_errno(errp
, -ret
, "Could not resize");
2964 aio_context_release(aio_context
);
2967 static void block_job_cb(void *opaque
, int ret
)
2969 /* Note that this function may be executed from another AioContext besides
2970 * the QEMU main loop. If you need to access anything that assumes the
2971 * QEMU global mutex, use a BH or introduce a mutex.
2974 BlockDriverState
*bs
= opaque
;
2975 const char *msg
= NULL
;
2977 trace_block_job_cb(bs
, bs
->job
, ret
);
2982 msg
= strerror(-ret
);
2985 if (block_job_is_cancelled(bs
->job
)) {
2986 block_job_event_cancelled(bs
->job
);
2988 block_job_event_completed(bs
->job
, msg
);
2992 void qmp_block_stream(const char *device
,
2993 bool has_base
, const char *base
,
2994 bool has_backing_file
, const char *backing_file
,
2995 bool has_speed
, int64_t speed
,
2996 bool has_on_error
, BlockdevOnError on_error
,
3000 BlockDriverState
*bs
;
3001 BlockDriverState
*base_bs
= NULL
;
3002 AioContext
*aio_context
;
3003 Error
*local_err
= NULL
;
3004 const char *base_name
= NULL
;
3006 if (!has_on_error
) {
3007 on_error
= BLOCKDEV_ON_ERROR_REPORT
;
3010 blk
= blk_by_name(device
);
3012 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
3013 "Device '%s' not found", device
);
3017 aio_context
= blk_get_aio_context(blk
);
3018 aio_context_acquire(aio_context
);
3020 if (!blk_is_available(blk
)) {
3021 error_setg(errp
, "Device '%s' has no medium", device
);
3026 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_STREAM
, errp
)) {
3031 base_bs
= bdrv_find_backing_image(bs
, base
);
3032 if (base_bs
== NULL
) {
3033 error_setg(errp
, QERR_BASE_NOT_FOUND
, base
);
3036 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
3040 /* if we are streaming the entire chain, the result will have no backing
3041 * file, and specifying one is therefore an error */
3042 if (base_bs
== NULL
&& has_backing_file
) {
3043 error_setg(errp
, "backing file specified, but streaming the "
3048 /* backing_file string overrides base bs filename */
3049 base_name
= has_backing_file
? backing_file
: base_name
;
3051 stream_start(bs
, base_bs
, base_name
, has_speed
? speed
: 0,
3052 on_error
, block_job_cb
, bs
, &local_err
);
3054 error_propagate(errp
, local_err
);
3058 trace_qmp_block_stream(bs
, bs
->job
);
3061 aio_context_release(aio_context
);
3064 void qmp_block_commit(const char *device
,
3065 bool has_base
, const char *base
,
3066 bool has_top
, const char *top
,
3067 bool has_backing_file
, const char *backing_file
,
3068 bool has_speed
, int64_t speed
,
3072 BlockDriverState
*bs
;
3073 BlockDriverState
*base_bs
, *top_bs
;
3074 AioContext
*aio_context
;
3075 Error
*local_err
= NULL
;
3076 /* This will be part of the QMP command, if/when the
3077 * BlockdevOnError change for blkmirror makes it in
3079 BlockdevOnError on_error
= BLOCKDEV_ON_ERROR_REPORT
;
3086 * libvirt relies on the DeviceNotFound error class in order to probe for
3087 * live commit feature versions; for this to work, we must make sure to
3088 * perform the device lookup before any generic errors that may occur in a
3089 * scenario in which all optional arguments are omitted. */
3090 blk
= blk_by_name(device
);
3092 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
3093 "Device '%s' not found", device
);
3097 aio_context
= blk_get_aio_context(blk
);
3098 aio_context_acquire(aio_context
);
3100 if (!blk_is_available(blk
)) {
3101 error_setg(errp
, "Device '%s' has no medium", device
);
3106 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_COMMIT_SOURCE
, errp
)) {
3110 /* default top_bs is the active layer */
3113 if (has_top
&& top
) {
3114 if (strcmp(bs
->filename
, top
) != 0) {
3115 top_bs
= bdrv_find_backing_image(bs
, top
);
3119 if (top_bs
== NULL
) {
3120 error_setg(errp
, "Top image file %s not found", top
? top
: "NULL");
3124 assert(bdrv_get_aio_context(top_bs
) == aio_context
);
3126 if (has_base
&& base
) {
3127 base_bs
= bdrv_find_backing_image(top_bs
, base
);
3129 base_bs
= bdrv_find_base(top_bs
);
3132 if (base_bs
== NULL
) {
3133 error_setg(errp
, QERR_BASE_NOT_FOUND
, base
? base
: "NULL");
3137 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
3139 if (bdrv_op_is_blocked(base_bs
, BLOCK_OP_TYPE_COMMIT_TARGET
, errp
)) {
3143 /* Do not allow attempts to commit an image into itself */
3144 if (top_bs
== base_bs
) {
3145 error_setg(errp
, "cannot commit an image into itself");
3150 if (has_backing_file
) {
3151 error_setg(errp
, "'backing-file' specified,"
3152 " but 'top' is the active layer");
3155 commit_active_start(bs
, base_bs
, speed
, on_error
, block_job_cb
,
3158 commit_start(bs
, base_bs
, top_bs
, speed
, on_error
, block_job_cb
, bs
,
3159 has_backing_file
? backing_file
: NULL
, &local_err
);
3161 if (local_err
!= NULL
) {
3162 error_propagate(errp
, local_err
);
3167 aio_context_release(aio_context
);
3170 static void do_drive_backup(const char *device
, const char *target
,
3171 bool has_format
, const char *format
,
3172 enum MirrorSyncMode sync
,
3173 bool has_mode
, enum NewImageMode mode
,
3174 bool has_speed
, int64_t speed
,
3175 bool has_bitmap
, const char *bitmap
,
3176 bool has_on_source_error
,
3177 BlockdevOnError on_source_error
,
3178 bool has_on_target_error
,
3179 BlockdevOnError on_target_error
,
3180 BlockJobTxn
*txn
, Error
**errp
)
3183 BlockDriverState
*bs
;
3184 BlockDriverState
*target_bs
;
3185 BlockDriverState
*source
= NULL
;
3186 BdrvDirtyBitmap
*bmap
= NULL
;
3187 AioContext
*aio_context
;
3188 QDict
*options
= NULL
;
3189 Error
*local_err
= NULL
;
3197 if (!has_on_source_error
) {
3198 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
3200 if (!has_on_target_error
) {
3201 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
3204 mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
3207 blk
= blk_by_name(device
);
3209 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
3210 "Device '%s' not found", device
);
3214 aio_context
= blk_get_aio_context(blk
);
3215 aio_context_acquire(aio_context
);
3217 /* Although backup_run has this check too, we need to use bs->drv below, so
3218 * do an early check redundantly. */
3219 if (!blk_is_available(blk
)) {
3220 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
3226 format
= mode
== NEW_IMAGE_MODE_EXISTING
? NULL
: bs
->drv
->format_name
;
3229 /* Early check to avoid creating target */
3230 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_BACKUP_SOURCE
, errp
)) {
3234 flags
= bs
->open_flags
| BDRV_O_RDWR
;
3236 /* See if we have a backing HD we can use to create our new image
3238 if (sync
== MIRROR_SYNC_MODE_TOP
) {
3239 source
= backing_bs(bs
);
3241 sync
= MIRROR_SYNC_MODE_FULL
;
3244 if (sync
== MIRROR_SYNC_MODE_NONE
) {
3248 size
= bdrv_getlength(bs
);
3250 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
3254 if (mode
!= NEW_IMAGE_MODE_EXISTING
) {
3257 bdrv_img_create(target
, format
, source
->filename
,
3258 source
->drv
->format_name
, NULL
,
3259 size
, flags
, &local_err
, false);
3261 bdrv_img_create(target
, format
, NULL
, NULL
, NULL
,
3262 size
, flags
, &local_err
, false);
3267 error_propagate(errp
, local_err
);
3272 options
= qdict_new();
3273 qdict_put(options
, "driver", qstring_from_str(format
));
3277 ret
= bdrv_open(&target_bs
, target
, NULL
, options
, flags
, &local_err
);
3279 error_propagate(errp
, local_err
);
3283 bdrv_set_aio_context(target_bs
, aio_context
);
3286 bmap
= bdrv_find_dirty_bitmap(bs
, bitmap
);
3288 error_setg(errp
, "Bitmap '%s' could not be found", bitmap
);
3289 bdrv_unref(target_bs
);
3294 backup_start(bs
, target_bs
, speed
, sync
, bmap
,
3295 on_source_error
, on_target_error
,
3296 block_job_cb
, bs
, txn
, &local_err
);
3297 if (local_err
!= NULL
) {
3298 bdrv_unref(target_bs
);
3299 error_propagate(errp
, local_err
);
3304 aio_context_release(aio_context
);
3307 void qmp_drive_backup(const char *device
, const char *target
,
3308 bool has_format
, const char *format
,
3309 enum MirrorSyncMode sync
,
3310 bool has_mode
, enum NewImageMode mode
,
3311 bool has_speed
, int64_t speed
,
3312 bool has_bitmap
, const char *bitmap
,
3313 bool has_on_source_error
, BlockdevOnError on_source_error
,
3314 bool has_on_target_error
, BlockdevOnError on_target_error
,
3317 return do_drive_backup(device
, target
, has_format
, format
, sync
,
3318 has_mode
, mode
, has_speed
, speed
,
3320 has_on_source_error
, on_source_error
,
3321 has_on_target_error
, on_target_error
,
3325 BlockDeviceInfoList
*qmp_query_named_block_nodes(Error
**errp
)
3327 return bdrv_named_nodes_list(errp
);
3330 void do_blockdev_backup(const char *device
, const char *target
,
3331 enum MirrorSyncMode sync
,
3332 bool has_speed
, int64_t speed
,
3333 bool has_on_source_error
,
3334 BlockdevOnError on_source_error
,
3335 bool has_on_target_error
,
3336 BlockdevOnError on_target_error
,
3337 BlockJobTxn
*txn
, Error
**errp
)
3339 BlockBackend
*blk
, *target_blk
;
3340 BlockDriverState
*bs
;
3341 BlockDriverState
*target_bs
;
3342 Error
*local_err
= NULL
;
3343 AioContext
*aio_context
;
3348 if (!has_on_source_error
) {
3349 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
3351 if (!has_on_target_error
) {
3352 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
3355 blk
= blk_by_name(device
);
3357 error_setg(errp
, "Device '%s' not found", device
);
3361 aio_context
= blk_get_aio_context(blk
);
3362 aio_context_acquire(aio_context
);
3364 if (!blk_is_available(blk
)) {
3365 error_setg(errp
, "Device '%s' has no medium", device
);
3370 target_blk
= blk_by_name(target
);
3372 error_setg(errp
, "Device '%s' not found", target
);
3376 if (!blk_is_available(target_blk
)) {
3377 error_setg(errp
, "Device '%s' has no medium", target
);
3380 target_bs
= blk_bs(target_blk
);
3382 bdrv_ref(target_bs
);
3383 bdrv_set_aio_context(target_bs
, aio_context
);
3384 backup_start(bs
, target_bs
, speed
, sync
, NULL
, on_source_error
,
3385 on_target_error
, block_job_cb
, bs
, txn
, &local_err
);
3386 if (local_err
!= NULL
) {
3387 bdrv_unref(target_bs
);
3388 error_propagate(errp
, local_err
);
3391 aio_context_release(aio_context
);
3394 void qmp_blockdev_backup(const char *device
, const char *target
,
3395 enum MirrorSyncMode sync
,
3396 bool has_speed
, int64_t speed
,
3397 bool has_on_source_error
,
3398 BlockdevOnError on_source_error
,
3399 bool has_on_target_error
,
3400 BlockdevOnError on_target_error
,
3403 do_blockdev_backup(device
, target
, sync
, has_speed
, speed
,
3404 has_on_source_error
, on_source_error
,
3405 has_on_target_error
, on_target_error
,
3409 /* Parameter check and block job starting for drive mirroring.
3410 * Caller should hold @device and @target's aio context (must be the same).
3412 static void blockdev_mirror_common(BlockDriverState
*bs
,
3413 BlockDriverState
*target
,
3414 bool has_replaces
, const char *replaces
,
3415 enum MirrorSyncMode sync
,
3416 bool has_speed
, int64_t speed
,
3417 bool has_granularity
, uint32_t granularity
,
3418 bool has_buf_size
, int64_t buf_size
,
3419 bool has_on_source_error
,
3420 BlockdevOnError on_source_error
,
3421 bool has_on_target_error
,
3422 BlockdevOnError on_target_error
,
3423 bool has_unmap
, bool unmap
,
3430 if (!has_on_source_error
) {
3431 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
3433 if (!has_on_target_error
) {
3434 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
3436 if (!has_granularity
) {
3439 if (!has_buf_size
) {
3446 if (granularity
!= 0 && (granularity
< 512 || granularity
> 1048576 * 64)) {
3447 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
3448 "a value in range [512B, 64MB]");
3451 if (granularity
& (granularity
- 1)) {
3452 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
3457 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_MIRROR_SOURCE
, errp
)) {
3460 if (bdrv_op_is_blocked(target
, BLOCK_OP_TYPE_MIRROR_TARGET
, errp
)) {
3464 error_setg(errp
, "Cannot mirror to an attached block device");
3468 if (!bs
->backing
&& sync
== MIRROR_SYNC_MODE_TOP
) {
3469 sync
= MIRROR_SYNC_MODE_FULL
;
3472 /* pass the node name to replace to mirror start since it's loose coupling
3473 * and will allow to check whether the node still exist at mirror completion
3475 mirror_start(bs
, target
,
3476 has_replaces
? replaces
: NULL
,
3477 speed
, granularity
, buf_size
, sync
,
3478 on_source_error
, on_target_error
, unmap
,
3479 block_job_cb
, bs
, errp
);
3482 void qmp_drive_mirror(const char *device
, const char *target
,
3483 bool has_format
, const char *format
,
3484 bool has_node_name
, const char *node_name
,
3485 bool has_replaces
, const char *replaces
,
3486 enum MirrorSyncMode sync
,
3487 bool has_mode
, enum NewImageMode mode
,
3488 bool has_speed
, int64_t speed
,
3489 bool has_granularity
, uint32_t granularity
,
3490 bool has_buf_size
, int64_t buf_size
,
3491 bool has_on_source_error
, BlockdevOnError on_source_error
,
3492 bool has_on_target_error
, BlockdevOnError on_target_error
,
3493 bool has_unmap
, bool unmap
,
3496 BlockDriverState
*bs
;
3498 BlockDriverState
*source
, *target_bs
;
3499 AioContext
*aio_context
;
3500 Error
*local_err
= NULL
;
3501 QDict
*options
= NULL
;
3506 blk
= blk_by_name(device
);
3508 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
3509 "Device '%s' not found", device
);
3513 aio_context
= blk_get_aio_context(blk
);
3514 aio_context_acquire(aio_context
);
3516 if (!blk_is_available(blk
)) {
3517 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
3522 mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
3526 format
= mode
== NEW_IMAGE_MODE_EXISTING
? NULL
: bs
->drv
->format_name
;
3529 flags
= bs
->open_flags
| BDRV_O_RDWR
;
3530 source
= backing_bs(bs
);
3531 if (!source
&& sync
== MIRROR_SYNC_MODE_TOP
) {
3532 sync
= MIRROR_SYNC_MODE_FULL
;
3534 if (sync
== MIRROR_SYNC_MODE_NONE
) {
3538 size
= bdrv_getlength(bs
);
3540 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
3545 BlockDriverState
*to_replace_bs
;
3546 AioContext
*replace_aio_context
;
3547 int64_t replace_size
;
3549 if (!has_node_name
) {
3550 error_setg(errp
, "a node-name must be provided when replacing a"
3551 " named node of the graph");
3555 to_replace_bs
= check_to_replace_node(bs
, replaces
, &local_err
);
3557 if (!to_replace_bs
) {
3558 error_propagate(errp
, local_err
);
3562 replace_aio_context
= bdrv_get_aio_context(to_replace_bs
);
3563 aio_context_acquire(replace_aio_context
);
3564 replace_size
= bdrv_getlength(to_replace_bs
);
3565 aio_context_release(replace_aio_context
);
3567 if (size
!= replace_size
) {
3568 error_setg(errp
, "cannot replace image with a mirror image of "
3574 if ((sync
== MIRROR_SYNC_MODE_FULL
|| !source
)
3575 && mode
!= NEW_IMAGE_MODE_EXISTING
)
3577 /* create new image w/o backing file */
3579 bdrv_img_create(target
, format
,
3580 NULL
, NULL
, NULL
, size
, flags
, &local_err
, false);
3583 case NEW_IMAGE_MODE_EXISTING
:
3585 case NEW_IMAGE_MODE_ABSOLUTE_PATHS
:
3586 /* create new image with backing file */
3587 bdrv_img_create(target
, format
,
3589 source
->drv
->format_name
,
3590 NULL
, size
, flags
, &local_err
, false);
3598 error_propagate(errp
, local_err
);
3602 options
= qdict_new();
3603 if (has_node_name
) {
3604 qdict_put(options
, "node-name", qstring_from_str(node_name
));
3607 qdict_put(options
, "driver", qstring_from_str(format
));
3610 /* Mirroring takes care of copy-on-write using the source's backing
3614 ret
= bdrv_open(&target_bs
, target
, NULL
, options
,
3615 flags
| BDRV_O_NO_BACKING
, &local_err
);
3617 error_propagate(errp
, local_err
);
3621 bdrv_set_aio_context(target_bs
, aio_context
);
3623 blockdev_mirror_common(bs
, target_bs
,
3624 has_replaces
, replaces
, sync
,
3626 has_granularity
, granularity
,
3627 has_buf_size
, buf_size
,
3628 has_on_source_error
, on_source_error
,
3629 has_on_target_error
, on_target_error
,
3633 error_propagate(errp
, local_err
);
3634 bdrv_unref(target_bs
);
3637 aio_context_release(aio_context
);
3640 void qmp_blockdev_mirror(const char *device
, const char *target
,
3641 bool has_replaces
, const char *replaces
,
3642 MirrorSyncMode sync
,
3643 bool has_speed
, int64_t speed
,
3644 bool has_granularity
, uint32_t granularity
,
3645 bool has_buf_size
, int64_t buf_size
,
3646 bool has_on_source_error
,
3647 BlockdevOnError on_source_error
,
3648 bool has_on_target_error
,
3649 BlockdevOnError on_target_error
,
3652 BlockDriverState
*bs
;
3654 BlockDriverState
*target_bs
;
3655 AioContext
*aio_context
;
3656 Error
*local_err
= NULL
;
3658 blk
= blk_by_name(device
);
3660 error_setg(errp
, "Device '%s' not found", device
);
3666 error_setg(errp
, "Device '%s' has no media", device
);
3670 target_bs
= bdrv_lookup_bs(target
, target
, errp
);
3675 aio_context
= bdrv_get_aio_context(bs
);
3676 aio_context_acquire(aio_context
);
3678 bdrv_ref(target_bs
);
3679 bdrv_set_aio_context(target_bs
, aio_context
);
3681 blockdev_mirror_common(bs
, target_bs
,
3682 has_replaces
, replaces
, sync
,
3684 has_granularity
, granularity
,
3685 has_buf_size
, buf_size
,
3686 has_on_source_error
, on_source_error
,
3687 has_on_target_error
, on_target_error
,
3691 error_propagate(errp
, local_err
);
3692 bdrv_unref(target_bs
);
3695 aio_context_release(aio_context
);
3698 /* Get the block job for a given device name and acquire its AioContext */
3699 static BlockJob
*find_block_job(const char *device
, AioContext
**aio_context
,
3703 BlockDriverState
*bs
;
3705 *aio_context
= NULL
;
3707 blk
= blk_by_name(device
);
3712 *aio_context
= blk_get_aio_context(blk
);
3713 aio_context_acquire(*aio_context
);
3715 if (!blk_is_available(blk
)) {
3727 error_set(errp
, ERROR_CLASS_DEVICE_NOT_ACTIVE
,
3728 "No active block job on device '%s'", device
);
3730 aio_context_release(*aio_context
);
3731 *aio_context
= NULL
;
3736 void qmp_block_job_set_speed(const char *device
, int64_t speed
, Error
**errp
)
3738 AioContext
*aio_context
;
3739 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3745 block_job_set_speed(job
, speed
, errp
);
3746 aio_context_release(aio_context
);
3749 void qmp_block_job_cancel(const char *device
,
3750 bool has_force
, bool force
, Error
**errp
)
3752 AioContext
*aio_context
;
3753 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3763 if (job
->user_paused
&& !force
) {
3764 error_setg(errp
, "The block job for device '%s' is currently paused",
3769 trace_qmp_block_job_cancel(job
);
3770 block_job_cancel(job
);
3772 aio_context_release(aio_context
);
3775 void qmp_block_job_pause(const char *device
, Error
**errp
)
3777 AioContext
*aio_context
;
3778 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3780 if (!job
|| job
->user_paused
) {
3784 job
->user_paused
= true;
3785 trace_qmp_block_job_pause(job
);
3786 block_job_pause(job
);
3787 aio_context_release(aio_context
);
3790 void qmp_block_job_resume(const char *device
, Error
**errp
)
3792 AioContext
*aio_context
;
3793 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3795 if (!job
|| !job
->user_paused
) {
3799 job
->user_paused
= false;
3800 trace_qmp_block_job_resume(job
);
3801 block_job_resume(job
);
3802 aio_context_release(aio_context
);
3805 void qmp_block_job_complete(const char *device
, Error
**errp
)
3807 AioContext
*aio_context
;
3808 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3814 trace_qmp_block_job_complete(job
);
3815 block_job_complete(job
, errp
);
3816 aio_context_release(aio_context
);
3819 void qmp_change_backing_file(const char *device
,
3820 const char *image_node_name
,
3821 const char *backing_file
,
3825 BlockDriverState
*bs
= NULL
;
3826 AioContext
*aio_context
;
3827 BlockDriverState
*image_bs
= NULL
;
3828 Error
*local_err
= NULL
;
3833 blk
= blk_by_name(device
);
3835 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
3836 "Device '%s' not found", device
);
3840 aio_context
= blk_get_aio_context(blk
);
3841 aio_context_acquire(aio_context
);
3843 if (!blk_is_available(blk
)) {
3844 error_setg(errp
, "Device '%s' has no medium", device
);
3849 image_bs
= bdrv_lookup_bs(NULL
, image_node_name
, &local_err
);
3851 error_propagate(errp
, local_err
);
3856 error_setg(errp
, "image file not found");
3860 if (bdrv_find_base(image_bs
) == image_bs
) {
3861 error_setg(errp
, "not allowing backing file change on an image "
3862 "without a backing file");
3866 /* even though we are not necessarily operating on bs, we need it to
3867 * determine if block ops are currently prohibited on the chain */
3868 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_CHANGE
, errp
)) {
3872 /* final sanity check */
3873 if (!bdrv_chain_contains(bs
, image_bs
)) {
3874 error_setg(errp
, "'%s' and image file are not in the same chain",
3879 /* if not r/w, reopen to make r/w */
3880 open_flags
= image_bs
->open_flags
;
3881 ro
= bdrv_is_read_only(image_bs
);
3884 bdrv_reopen(image_bs
, open_flags
| BDRV_O_RDWR
, &local_err
);
3886 error_propagate(errp
, local_err
);
3891 ret
= bdrv_change_backing_file(image_bs
, backing_file
,
3892 image_bs
->drv
? image_bs
->drv
->format_name
: "");
3895 error_setg_errno(errp
, -ret
, "Could not change backing file to '%s'",
3897 /* don't exit here, so we can try to restore open flags if
3902 bdrv_reopen(image_bs
, open_flags
, &local_err
);
3904 error_propagate(errp
, local_err
); /* will preserve prior errp */
3909 aio_context_release(aio_context
);
3912 void hmp_drive_add_node(Monitor
*mon
, const char *optstr
)
3916 Error
*local_err
= NULL
;
3918 opts
= qemu_opts_parse_noisily(&qemu_drive_opts
, optstr
, false);
3923 qdict
= qemu_opts_to_qdict(opts
, NULL
);
3925 if (!qdict_get_try_str(qdict
, "node-name")) {
3927 error_report("'node-name' needs to be specified");
3931 BlockDriverState
*bs
= bds_tree_init(qdict
, &local_err
);
3933 error_report_err(local_err
);
3937 QTAILQ_INSERT_TAIL(&monitor_bdrv_states
, bs
, monitor_list
);
3940 qemu_opts_del(opts
);
3943 void qmp_blockdev_add(BlockdevOptions
*options
, Error
**errp
)
3945 QmpOutputVisitor
*ov
= qmp_output_visitor_new();
3946 BlockDriverState
*bs
;
3947 BlockBackend
*blk
= NULL
;
3950 Error
*local_err
= NULL
;
3952 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3953 * cache.direct=false instead of silently switching to aio=threads, except
3954 * when called from drive_new().
3956 * For now, simply forbidding the combination for all drivers will do. */
3957 if (options
->has_aio
&& options
->aio
== BLOCKDEV_AIO_OPTIONS_NATIVE
) {
3958 bool direct
= options
->has_cache
&&
3959 options
->cache
->has_direct
&&
3960 options
->cache
->direct
;
3962 error_setg(errp
, "aio=native requires cache.direct=true");
3967 visit_type_BlockdevOptions(qmp_output_get_visitor(ov
), NULL
, &options
,
3970 error_propagate(errp
, local_err
);
3974 obj
= qmp_output_get_qobject(ov
);
3975 qdict
= qobject_to_qdict(obj
);
3977 qdict_flatten(qdict
);
3979 if (options
->has_id
) {
3980 blk
= blockdev_init(NULL
, qdict
, &local_err
);
3982 error_propagate(errp
, local_err
);
3988 if (!qdict_get_try_str(qdict
, "node-name")) {
3989 error_setg(errp
, "'id' and/or 'node-name' need to be specified for "
3994 bs
= bds_tree_init(qdict
, errp
);
3999 QTAILQ_INSERT_TAIL(&monitor_bdrv_states
, bs
, monitor_list
);
4002 if (bs
&& bdrv_key_required(bs
)) {
4004 monitor_remove_blk(blk
);
4007 QTAILQ_REMOVE(&monitor_bdrv_states
, bs
, monitor_list
);
4010 error_setg(errp
, "blockdev-add doesn't support encrypted devices");
4015 qmp_output_visitor_cleanup(ov
);
4018 void qmp_x_blockdev_del(bool has_id
, const char *id
,
4019 bool has_node_name
, const char *node_name
, Error
**errp
)
4021 AioContext
*aio_context
;
4023 BlockDriverState
*bs
;
4025 if (has_id
&& has_node_name
) {
4026 error_setg(errp
, "Only one of id and node-name must be specified");
4028 } else if (!has_id
&& !has_node_name
) {
4029 error_setg(errp
, "No block device specified");
4034 /* blk_by_name() never returns a BB that is not owned by the monitor */
4035 blk
= blk_by_name(id
);
4037 error_setg(errp
, "Cannot find block backend %s", id
);
4040 if (blk_legacy_dinfo(blk
)) {
4041 error_setg(errp
, "Deleting block backend added with drive-add"
4042 " is not supported");
4045 if (blk_get_refcnt(blk
) > 1) {
4046 error_setg(errp
, "Block backend %s is in use", id
);
4050 aio_context
= blk_get_aio_context(blk
);
4052 bs
= bdrv_find_node(node_name
);
4054 error_setg(errp
, "Cannot find node %s", node_name
);
4059 error_setg(errp
, "Node %s is in use by %s",
4060 node_name
, blk_name(blk
));
4063 aio_context
= bdrv_get_aio_context(bs
);
4066 aio_context_acquire(aio_context
);
4069 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_DRIVE_DEL
, errp
)) {
4073 if (!blk
&& !bs
->monitor_list
.tqe_prev
) {
4074 error_setg(errp
, "Node %s is not owned by the monitor",
4079 if (bs
->refcnt
> 1) {
4080 error_setg(errp
, "Block device %s is in use",
4081 bdrv_get_device_or_node_name(bs
));
4087 monitor_remove_blk(blk
);
4090 QTAILQ_REMOVE(&monitor_bdrv_states
, bs
, monitor_list
);
4095 aio_context_release(aio_context
);
4098 BlockJobInfoList
*qmp_query_block_jobs(Error
**errp
)
4100 BlockJobInfoList
*head
= NULL
, **p_next
= &head
;
4101 BlockDriverState
*bs
;
4103 for (bs
= bdrv_next(NULL
); bs
; bs
= bdrv_next(bs
)) {
4104 AioContext
*aio_context
= bdrv_get_aio_context(bs
);
4106 aio_context_acquire(aio_context
);
4109 BlockJobInfoList
*elem
= g_new0(BlockJobInfoList
, 1);
4110 elem
->value
= block_job_query(bs
->job
);
4112 p_next
= &elem
->next
;
4115 aio_context_release(aio_context
);
4121 QemuOptsList qemu_common_drive_opts
= {
4123 .head
= QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts
.head
),
4127 .type
= QEMU_OPT_BOOL
,
4128 .help
= "enable/disable snapshot mode",
4131 .type
= QEMU_OPT_STRING
,
4132 .help
= "discard operation (ignore/off, unmap/on)",
4135 .type
= QEMU_OPT_STRING
,
4136 .help
= "host AIO implementation (threads, native)",
4138 .name
= BDRV_OPT_CACHE_WB
,
4139 .type
= QEMU_OPT_BOOL
,
4140 .help
= "Enable writeback mode",
4143 .type
= QEMU_OPT_STRING
,
4144 .help
= "disk format (raw, qcow2, ...)",
4147 .type
= QEMU_OPT_STRING
,
4148 .help
= "read error action",
4151 .type
= QEMU_OPT_STRING
,
4152 .help
= "write error action",
4154 .name
= "read-only",
4155 .type
= QEMU_OPT_BOOL
,
4156 .help
= "open drive file as read-only",
4158 .name
= "throttling.iops-total",
4159 .type
= QEMU_OPT_NUMBER
,
4160 .help
= "limit total I/O operations per second",
4162 .name
= "throttling.iops-read",
4163 .type
= QEMU_OPT_NUMBER
,
4164 .help
= "limit read operations per second",
4166 .name
= "throttling.iops-write",
4167 .type
= QEMU_OPT_NUMBER
,
4168 .help
= "limit write operations per second",
4170 .name
= "throttling.bps-total",
4171 .type
= QEMU_OPT_NUMBER
,
4172 .help
= "limit total bytes per second",
4174 .name
= "throttling.bps-read",
4175 .type
= QEMU_OPT_NUMBER
,
4176 .help
= "limit read bytes per second",
4178 .name
= "throttling.bps-write",
4179 .type
= QEMU_OPT_NUMBER
,
4180 .help
= "limit write bytes per second",
4182 .name
= "throttling.iops-total-max",
4183 .type
= QEMU_OPT_NUMBER
,
4184 .help
= "I/O operations burst",
4186 .name
= "throttling.iops-read-max",
4187 .type
= QEMU_OPT_NUMBER
,
4188 .help
= "I/O operations read burst",
4190 .name
= "throttling.iops-write-max",
4191 .type
= QEMU_OPT_NUMBER
,
4192 .help
= "I/O operations write burst",
4194 .name
= "throttling.bps-total-max",
4195 .type
= QEMU_OPT_NUMBER
,
4196 .help
= "total bytes burst",
4198 .name
= "throttling.bps-read-max",
4199 .type
= QEMU_OPT_NUMBER
,
4200 .help
= "total bytes read burst",
4202 .name
= "throttling.bps-write-max",
4203 .type
= QEMU_OPT_NUMBER
,
4204 .help
= "total bytes write burst",
4206 .name
= "throttling.iops-total-max-length",
4207 .type
= QEMU_OPT_NUMBER
,
4208 .help
= "length of the iops-total-max burst period, in seconds",
4210 .name
= "throttling.iops-read-max-length",
4211 .type
= QEMU_OPT_NUMBER
,
4212 .help
= "length of the iops-read-max burst period, in seconds",
4214 .name
= "throttling.iops-write-max-length",
4215 .type
= QEMU_OPT_NUMBER
,
4216 .help
= "length of the iops-write-max burst period, in seconds",
4218 .name
= "throttling.bps-total-max-length",
4219 .type
= QEMU_OPT_NUMBER
,
4220 .help
= "length of the bps-total-max burst period, in seconds",
4222 .name
= "throttling.bps-read-max-length",
4223 .type
= QEMU_OPT_NUMBER
,
4224 .help
= "length of the bps-read-max burst period, in seconds",
4226 .name
= "throttling.bps-write-max-length",
4227 .type
= QEMU_OPT_NUMBER
,
4228 .help
= "length of the bps-write-max burst period, in seconds",
4230 .name
= "throttling.iops-size",
4231 .type
= QEMU_OPT_NUMBER
,
4232 .help
= "when limiting by iops max size of an I/O in bytes",
4234 .name
= "throttling.group",
4235 .type
= QEMU_OPT_STRING
,
4236 .help
= "name of the block throttling group",
4238 .name
= "copy-on-read",
4239 .type
= QEMU_OPT_BOOL
,
4240 .help
= "copy read data from backing file into image file",
4242 .name
= "detect-zeroes",
4243 .type
= QEMU_OPT_STRING
,
4244 .help
= "try to optimize zero writes (off, on, unmap)",
4246 .name
= "stats-account-invalid",
4247 .type
= QEMU_OPT_BOOL
,
4248 .help
= "whether to account for invalid I/O operations "
4249 "in the statistics",
4251 .name
= "stats-account-failed",
4252 .type
= QEMU_OPT_BOOL
,
4253 .help
= "whether to account for failed I/O operations "
4254 "in the statistics",
4256 { /* end of list */ }
4260 static QemuOptsList qemu_root_bds_opts
= {
4262 .head
= QTAILQ_HEAD_INITIALIZER(qemu_root_bds_opts
.head
),
4266 .type
= QEMU_OPT_STRING
,
4267 .help
= "discard operation (ignore/off, unmap/on)",
4270 .type
= QEMU_OPT_STRING
,
4271 .help
= "host AIO implementation (threads, native)",
4273 .name
= "read-only",
4274 .type
= QEMU_OPT_BOOL
,
4275 .help
= "open drive file as read-only",
4277 .name
= "copy-on-read",
4278 .type
= QEMU_OPT_BOOL
,
4279 .help
= "copy read data from backing file into image file",
4281 .name
= "detect-zeroes",
4282 .type
= QEMU_OPT_STRING
,
4283 .help
= "try to optimize zero writes (off, on, unmap)",
4285 { /* end of list */ }
4289 QemuOptsList qemu_drive_opts
= {
4291 .head
= QTAILQ_HEAD_INITIALIZER(qemu_drive_opts
.head
),
4294 * no elements => accept any params
4295 * validation will happen later
4297 { /* end of list */ }