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 int do_open_tray(const char *device
, bool force
, Error
**errp
);
61 static const char *const if_name
[IF_COUNT
] = {
65 [IF_FLOPPY
] = "floppy",
66 [IF_PFLASH
] = "pflash",
69 [IF_VIRTIO
] = "virtio",
73 static int if_max_devs
[IF_COUNT
] = {
75 * Do not change these numbers! They govern how drive option
76 * index maps to unit and bus. That mapping is ABI.
78 * All controllers used to implement if=T drives need to support
79 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
80 * Otherwise, some index values map to "impossible" bus, unit
83 * For instance, if you change [IF_SCSI] to 255, -drive
84 * if=scsi,index=12 no longer means bus=1,unit=5, but
85 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
86 * the drive can't be set up. Regression.
93 * Boards may call this to offer board-by-board overrides
94 * of the default, global values.
96 void override_max_devs(BlockInterfaceType type
, int max_devs
)
105 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
106 dinfo
= blk_legacy_dinfo(blk
);
107 if (dinfo
->type
== type
) {
108 fprintf(stderr
, "Cannot override units-per-bus property of"
109 " the %s interface, because a drive of that type has"
110 " already been added.\n", if_name
[type
]);
111 g_assert_not_reached();
115 if_max_devs
[type
] = max_devs
;
119 * We automatically delete the drive when a device using it gets
120 * unplugged. Questionable feature, but we can't just drop it.
121 * Device models call blockdev_mark_auto_del() to schedule the
122 * automatic deletion, and generic qdev code calls blockdev_auto_del()
123 * when deletion is actually safe.
125 void blockdev_mark_auto_del(BlockBackend
*blk
)
127 DriveInfo
*dinfo
= blk_legacy_dinfo(blk
);
128 BlockDriverState
*bs
= blk_bs(blk
);
129 AioContext
*aio_context
;
136 aio_context
= bdrv_get_aio_context(bs
);
137 aio_context_acquire(aio_context
);
140 block_job_cancel(bs
->job
);
143 aio_context_release(aio_context
);
149 void blockdev_auto_del(BlockBackend
*blk
)
151 DriveInfo
*dinfo
= blk_legacy_dinfo(blk
);
153 if (dinfo
&& dinfo
->auto_del
) {
154 monitor_remove_blk(blk
);
160 * Returns the current mapping of how many units per bus
161 * a particular interface can support.
163 * A positive integer indicates n units per bus.
164 * 0 implies the mapping has not been established.
165 * -1 indicates an invalid BlockInterfaceType was given.
167 int drive_get_max_devs(BlockInterfaceType type
)
169 if (type
>= IF_IDE
&& type
< IF_COUNT
) {
170 return if_max_devs
[type
];
176 static int drive_index_to_bus_id(BlockInterfaceType type
, int index
)
178 int max_devs
= if_max_devs
[type
];
179 return max_devs
? index
/ max_devs
: 0;
182 static int drive_index_to_unit_id(BlockInterfaceType type
, int index
)
184 int max_devs
= if_max_devs
[type
];
185 return max_devs
? index
% max_devs
: index
;
188 QemuOpts
*drive_def(const char *optstr
)
190 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr
, false);
193 QemuOpts
*drive_add(BlockInterfaceType type
, int index
, const char *file
,
198 opts
= drive_def(optstr
);
202 if (type
!= IF_DEFAULT
) {
203 qemu_opt_set(opts
, "if", if_name
[type
], &error_abort
);
206 qemu_opt_set_number(opts
, "index", index
, &error_abort
);
209 qemu_opt_set(opts
, "file", file
, &error_abort
);
213 DriveInfo
*drive_get(BlockInterfaceType type
, int bus
, int unit
)
218 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
219 dinfo
= blk_legacy_dinfo(blk
);
220 if (dinfo
&& dinfo
->type
== type
221 && dinfo
->bus
== bus
&& dinfo
->unit
== unit
) {
229 bool drive_check_orphaned(void)
235 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
236 dinfo
= blk_legacy_dinfo(blk
);
237 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
238 /* Unless this is a default drive, this may be an oversight. */
239 if (!blk_get_attached_dev(blk
) && !dinfo
->is_default
&&
240 dinfo
->type
!= IF_NONE
) {
241 fprintf(stderr
, "Warning: Orphaned drive without device: "
242 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
243 blk_name(blk
), blk_bs(blk
) ? blk_bs(blk
)->filename
: "",
244 if_name
[dinfo
->type
], dinfo
->bus
, dinfo
->unit
);
252 DriveInfo
*drive_get_by_index(BlockInterfaceType type
, int index
)
254 return drive_get(type
,
255 drive_index_to_bus_id(type
, index
),
256 drive_index_to_unit_id(type
, index
));
259 int drive_get_max_bus(BlockInterfaceType type
)
266 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
267 dinfo
= blk_legacy_dinfo(blk
);
268 if (dinfo
&& dinfo
->type
== type
&& dinfo
->bus
> max_bus
) {
269 max_bus
= dinfo
->bus
;
275 /* Get a block device. This should only be used for single-drive devices
276 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
278 DriveInfo
*drive_get_next(BlockInterfaceType type
)
280 static int next_block_unit
[IF_COUNT
];
282 return drive_get(type
, 0, next_block_unit
[type
]++);
285 static void bdrv_format_print(void *opaque
, const char *name
)
287 error_printf(" %s", name
);
292 BlockDriverState
*bs
;
295 static int parse_block_error_action(const char *buf
, bool is_read
, Error
**errp
)
297 if (!strcmp(buf
, "ignore")) {
298 return BLOCKDEV_ON_ERROR_IGNORE
;
299 } else if (!is_read
&& !strcmp(buf
, "enospc")) {
300 return BLOCKDEV_ON_ERROR_ENOSPC
;
301 } else if (!strcmp(buf
, "stop")) {
302 return BLOCKDEV_ON_ERROR_STOP
;
303 } else if (!strcmp(buf
, "report")) {
304 return BLOCKDEV_ON_ERROR_REPORT
;
306 error_setg(errp
, "'%s' invalid %s error action",
307 buf
, is_read
? "read" : "write");
312 static bool parse_stats_intervals(BlockAcctStats
*stats
, QList
*intervals
,
315 const QListEntry
*entry
;
316 for (entry
= qlist_first(intervals
); entry
; entry
= qlist_next(entry
)) {
317 switch (qobject_type(entry
->value
)) {
319 case QTYPE_QSTRING
: {
320 unsigned long long length
;
321 const char *str
= qstring_get_str(qobject_to_qstring(entry
->value
));
322 if (parse_uint_full(str
, &length
, 10) == 0 &&
323 length
> 0 && length
<= UINT_MAX
) {
324 block_acct_add_interval(stats
, (unsigned) length
);
326 error_setg(errp
, "Invalid interval length: %s", str
);
333 int64_t length
= qint_get_int(qobject_to_qint(entry
->value
));
334 if (length
> 0 && length
<= UINT_MAX
) {
335 block_acct_add_interval(stats
, (unsigned) length
);
337 error_setg(errp
, "Invalid interval length: %" PRId64
, length
);
344 error_setg(errp
, "The specification of stats-intervals is invalid");
351 typedef enum { MEDIA_DISK
, MEDIA_CDROM
} DriveMediaType
;
353 /* All parameters but @opts are optional and may be set to NULL. */
354 static void extract_common_blockdev_options(QemuOpts
*opts
, int *bdrv_flags
,
355 const char **throttling_group
, ThrottleConfig
*throttle_cfg
,
356 BlockdevDetectZeroesOptions
*detect_zeroes
, Error
**errp
)
359 Error
*local_error
= NULL
;
363 if (qemu_opt_get_bool(opts
, "copy-on-read", false)) {
364 *bdrv_flags
|= BDRV_O_COPY_ON_READ
;
367 if ((discard
= qemu_opt_get(opts
, "discard")) != NULL
) {
368 if (bdrv_parse_discard_flags(discard
, bdrv_flags
) != 0) {
369 error_setg(errp
, "Invalid discard option");
374 if ((aio
= qemu_opt_get(opts
, "aio")) != NULL
) {
375 if (!strcmp(aio
, "native")) {
376 *bdrv_flags
|= BDRV_O_NATIVE_AIO
;
377 } else if (!strcmp(aio
, "threads")) {
378 /* this is the default */
380 error_setg(errp
, "invalid aio option");
386 /* disk I/O throttling */
387 if (throttling_group
) {
388 *throttling_group
= qemu_opt_get(opts
, "throttling.group");
392 throttle_config_init(throttle_cfg
);
393 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].avg
=
394 qemu_opt_get_number(opts
, "throttling.bps-total", 0);
395 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].avg
=
396 qemu_opt_get_number(opts
, "throttling.bps-read", 0);
397 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].avg
=
398 qemu_opt_get_number(opts
, "throttling.bps-write", 0);
399 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].avg
=
400 qemu_opt_get_number(opts
, "throttling.iops-total", 0);
401 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].avg
=
402 qemu_opt_get_number(opts
, "throttling.iops-read", 0);
403 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].avg
=
404 qemu_opt_get_number(opts
, "throttling.iops-write", 0);
406 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].max
=
407 qemu_opt_get_number(opts
, "throttling.bps-total-max", 0);
408 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].max
=
409 qemu_opt_get_number(opts
, "throttling.bps-read-max", 0);
410 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].max
=
411 qemu_opt_get_number(opts
, "throttling.bps-write-max", 0);
412 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].max
=
413 qemu_opt_get_number(opts
, "throttling.iops-total-max", 0);
414 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].max
=
415 qemu_opt_get_number(opts
, "throttling.iops-read-max", 0);
416 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].max
=
417 qemu_opt_get_number(opts
, "throttling.iops-write-max", 0);
419 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].burst_length
=
420 qemu_opt_get_number(opts
, "throttling.bps-total-max-length", 1);
421 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].burst_length
=
422 qemu_opt_get_number(opts
, "throttling.bps-read-max-length", 1);
423 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].burst_length
=
424 qemu_opt_get_number(opts
, "throttling.bps-write-max-length", 1);
425 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].burst_length
=
426 qemu_opt_get_number(opts
, "throttling.iops-total-max-length", 1);
427 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].burst_length
=
428 qemu_opt_get_number(opts
, "throttling.iops-read-max-length", 1);
429 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].burst_length
=
430 qemu_opt_get_number(opts
, "throttling.iops-write-max-length", 1);
432 throttle_cfg
->op_size
=
433 qemu_opt_get_number(opts
, "throttling.iops-size", 0);
435 if (!throttle_is_valid(throttle_cfg
, errp
)) {
442 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup
,
443 qemu_opt_get(opts
, "detect-zeroes"),
444 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX
,
445 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
,
448 error_propagate(errp
, local_error
);
453 *detect_zeroes
== BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP
&&
454 !(*bdrv_flags
& BDRV_O_UNMAP
))
456 error_setg(errp
, "setting detect-zeroes to unmap is not allowed "
457 "without setting discard operation to unmap");
463 /* Takes the ownership of bs_opts */
464 static BlockBackend
*blockdev_init(const char *file
, QDict
*bs_opts
,
469 int on_read_error
, on_write_error
;
470 bool account_invalid
, account_failed
;
471 bool writethrough
, read_only
;
473 BlockDriverState
*bs
;
478 QDict
*interval_dict
= NULL
;
479 QList
*interval_list
= NULL
;
481 BlockdevDetectZeroesOptions detect_zeroes
=
482 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
;
483 const char *throttling_group
= NULL
;
485 /* Check common options by copying from bs_opts to opts, all other options
486 * stay in bs_opts for processing by bdrv_open(). */
487 id
= qdict_get_try_str(bs_opts
, "id");
488 opts
= qemu_opts_create(&qemu_common_drive_opts
, id
, 1, &error
);
490 error_propagate(errp
, error
);
494 qemu_opts_absorb_qdict(opts
, bs_opts
, &error
);
496 error_propagate(errp
, error
);
501 qdict_del(bs_opts
, "id");
504 /* extract parameters */
505 snapshot
= qemu_opt_get_bool(opts
, "snapshot", 0);
507 account_invalid
= qemu_opt_get_bool(opts
, "stats-account-invalid", true);
508 account_failed
= qemu_opt_get_bool(opts
, "stats-account-failed", true);
510 writethrough
= !qemu_opt_get_bool(opts
, BDRV_OPT_CACHE_WB
, true);
512 id
= qemu_opts_id(opts
);
514 qdict_extract_subqdict(bs_opts
, &interval_dict
, "stats-intervals.");
515 qdict_array_split(interval_dict
, &interval_list
);
517 if (qdict_size(interval_dict
) != 0) {
518 error_setg(errp
, "Invalid option stats-intervals.%s",
519 qdict_first(interval_dict
)->key
);
523 extract_common_blockdev_options(opts
, &bdrv_flags
, &throttling_group
, &cfg
,
524 &detect_zeroes
, &error
);
526 error_propagate(errp
, error
);
530 if ((buf
= qemu_opt_get(opts
, "format")) != NULL
) {
531 if (is_help_option(buf
)) {
532 error_printf("Supported formats:");
533 bdrv_iterate_format(bdrv_format_print
, NULL
);
538 if (qdict_haskey(bs_opts
, "driver")) {
539 error_setg(errp
, "Cannot specify both 'driver' and 'format'");
542 qdict_put(bs_opts
, "driver", qstring_from_str(buf
));
545 on_write_error
= BLOCKDEV_ON_ERROR_ENOSPC
;
546 if ((buf
= qemu_opt_get(opts
, "werror")) != NULL
) {
547 on_write_error
= parse_block_error_action(buf
, 0, &error
);
549 error_propagate(errp
, error
);
554 on_read_error
= BLOCKDEV_ON_ERROR_REPORT
;
555 if ((buf
= qemu_opt_get(opts
, "rerror")) != NULL
) {
556 on_read_error
= parse_block_error_action(buf
, 1, &error
);
558 error_propagate(errp
, error
);
564 bdrv_flags
|= BDRV_O_SNAPSHOT
;
567 read_only
= qemu_opt_get_bool(opts
, BDRV_OPT_READ_ONLY
, false);
570 if ((!file
|| !*file
) && !qdict_size(bs_opts
)) {
571 BlockBackendRootState
*blk_rs
;
574 blk_rs
= blk_get_root_state(blk
);
575 blk_rs
->open_flags
= bdrv_flags
;
576 blk_rs
->read_only
= read_only
;
577 blk_rs
->detect_zeroes
= detect_zeroes
;
581 if (file
&& !*file
) {
585 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
586 * with other callers) rather than what we want as the real defaults.
587 * Apply the defaults here instead. */
588 qdict_set_default_str(bs_opts
, BDRV_OPT_CACHE_DIRECT
, "off");
589 qdict_set_default_str(bs_opts
, BDRV_OPT_CACHE_NO_FLUSH
, "off");
590 qdict_set_default_str(bs_opts
, BDRV_OPT_READ_ONLY
,
591 read_only
? "on" : "off");
592 assert((bdrv_flags
& BDRV_O_CACHE_MASK
) == 0);
594 if (runstate_check(RUN_STATE_INMIGRATE
)) {
595 bdrv_flags
|= BDRV_O_INACTIVE
;
598 blk
= blk_new_open(file
, NULL
, bs_opts
, bdrv_flags
, errp
);
604 bs
->detect_zeroes
= detect_zeroes
;
606 if (bdrv_key_required(bs
)) {
610 block_acct_init(blk_get_stats(blk
), account_invalid
, account_failed
);
612 if (!parse_stats_intervals(blk_get_stats(blk
), interval_list
, errp
)) {
619 /* disk I/O throttling */
620 if (throttle_enabled(&cfg
)) {
621 if (!throttling_group
) {
622 throttling_group
= id
;
624 blk_io_limits_enable(blk
, throttling_group
);
625 blk_set_io_limits(blk
, &cfg
);
628 blk_set_enable_write_cache(blk
, !writethrough
);
629 blk_set_on_error(blk
, on_read_error
, on_write_error
);
631 if (!monitor_add_blk(blk
, id
, errp
)) {
639 QDECREF(interval_dict
);
640 QDECREF(interval_list
);
645 QDECREF(interval_dict
);
646 QDECREF(interval_list
);
652 static QemuOptsList qemu_root_bds_opts
;
654 /* Takes the ownership of bs_opts */
655 static BlockDriverState
*bds_tree_init(QDict
*bs_opts
, Error
**errp
)
657 BlockDriverState
*bs
;
659 Error
*local_error
= NULL
;
660 BlockdevDetectZeroesOptions detect_zeroes
;
663 opts
= qemu_opts_create(&qemu_root_bds_opts
, NULL
, 1, errp
);
668 qemu_opts_absorb_qdict(opts
, bs_opts
, &local_error
);
670 error_propagate(errp
, local_error
);
674 extract_common_blockdev_options(opts
, &bdrv_flags
, NULL
, NULL
,
675 &detect_zeroes
, &local_error
);
677 error_propagate(errp
, local_error
);
681 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
682 * with other callers) rather than what we want as the real defaults.
683 * Apply the defaults here instead. */
684 qdict_set_default_str(bs_opts
, BDRV_OPT_CACHE_DIRECT
, "off");
685 qdict_set_default_str(bs_opts
, BDRV_OPT_CACHE_NO_FLUSH
, "off");
686 qdict_set_default_str(bs_opts
, BDRV_OPT_READ_ONLY
, "off");
688 if (runstate_check(RUN_STATE_INMIGRATE
)) {
689 bdrv_flags
|= BDRV_O_INACTIVE
;
692 bs
= bdrv_open(NULL
, NULL
, bs_opts
, bdrv_flags
, errp
);
694 goto fail_no_bs_opts
;
697 bs
->detect_zeroes
= detect_zeroes
;
709 void blockdev_close_all_bdrv_states(void)
711 BlockDriverState
*bs
, *next_bs
;
713 QTAILQ_FOREACH_SAFE(bs
, &monitor_bdrv_states
, monitor_list
, next_bs
) {
714 AioContext
*ctx
= bdrv_get_aio_context(bs
);
716 aio_context_acquire(ctx
);
718 aio_context_release(ctx
);
722 /* Iterates over the list of monitor-owned BlockDriverStates */
723 BlockDriverState
*bdrv_next_monitor_owned(BlockDriverState
*bs
)
725 return bs
? QTAILQ_NEXT(bs
, monitor_list
)
726 : QTAILQ_FIRST(&monitor_bdrv_states
);
729 static void qemu_opt_rename(QemuOpts
*opts
, const char *from
, const char *to
,
734 value
= qemu_opt_get(opts
, from
);
736 if (qemu_opt_find(opts
, to
)) {
737 error_setg(errp
, "'%s' and its alias '%s' can't be used at the "
738 "same time", to
, from
);
743 /* rename all items in opts */
744 while ((value
= qemu_opt_get(opts
, from
))) {
745 qemu_opt_set(opts
, to
, value
, &error_abort
);
746 qemu_opt_unset(opts
, from
);
750 QemuOptsList qemu_legacy_drive_opts
= {
752 .head
= QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts
.head
),
756 .type
= QEMU_OPT_NUMBER
,
757 .help
= "bus number",
760 .type
= QEMU_OPT_NUMBER
,
761 .help
= "unit number (i.e. lun for scsi)",
764 .type
= QEMU_OPT_NUMBER
,
765 .help
= "index number",
768 .type
= QEMU_OPT_STRING
,
769 .help
= "media type (disk, cdrom)",
772 .type
= QEMU_OPT_STRING
,
773 .help
= "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
776 .type
= QEMU_OPT_NUMBER
,
777 .help
= "number of cylinders (ide disk geometry)",
780 .type
= QEMU_OPT_NUMBER
,
781 .help
= "number of heads (ide disk geometry)",
784 .type
= QEMU_OPT_NUMBER
,
785 .help
= "number of sectors (ide disk geometry)",
788 .type
= QEMU_OPT_STRING
,
789 .help
= "chs translation (auto, lba, none)",
792 .type
= QEMU_OPT_BOOL
,
793 .help
= "(deprecated, ignored)",
796 .type
= QEMU_OPT_STRING
,
797 .help
= "pci address (virtio only)",
800 .type
= QEMU_OPT_STRING
,
801 .help
= "disk serial number",
804 .type
= QEMU_OPT_STRING
,
808 /* Options that are passed on, but have special semantics with -drive */
810 .name
= BDRV_OPT_READ_ONLY
,
811 .type
= QEMU_OPT_BOOL
,
812 .help
= "open drive file as read-only",
815 .type
= QEMU_OPT_STRING
,
816 .help
= "read error action",
819 .type
= QEMU_OPT_STRING
,
820 .help
= "write error action",
822 .name
= "copy-on-read",
823 .type
= QEMU_OPT_BOOL
,
824 .help
= "copy read data from backing file into image file",
827 { /* end of list */ }
831 DriveInfo
*drive_new(QemuOpts
*all_opts
, BlockInterfaceType block_default_type
)
835 DriveInfo
*dinfo
= NULL
;
837 QemuOpts
*legacy_opts
;
838 DriveMediaType media
= MEDIA_DISK
;
839 BlockInterfaceType type
;
840 int cyls
, heads
, secs
, translation
;
841 int max_devs
, bus_id
, unit_id
, index
;
843 const char *werror
, *rerror
;
844 bool read_only
= false;
847 const char *filename
;
848 Error
*local_err
= NULL
;
851 /* Change legacy command line options into QMP ones */
852 static const struct {
856 { "iops", "throttling.iops-total" },
857 { "iops_rd", "throttling.iops-read" },
858 { "iops_wr", "throttling.iops-write" },
860 { "bps", "throttling.bps-total" },
861 { "bps_rd", "throttling.bps-read" },
862 { "bps_wr", "throttling.bps-write" },
864 { "iops_max", "throttling.iops-total-max" },
865 { "iops_rd_max", "throttling.iops-read-max" },
866 { "iops_wr_max", "throttling.iops-write-max" },
868 { "bps_max", "throttling.bps-total-max" },
869 { "bps_rd_max", "throttling.bps-read-max" },
870 { "bps_wr_max", "throttling.bps-write-max" },
872 { "iops_size", "throttling.iops-size" },
874 { "group", "throttling.group" },
876 { "readonly", BDRV_OPT_READ_ONLY
},
879 for (i
= 0; i
< ARRAY_SIZE(opt_renames
); i
++) {
880 qemu_opt_rename(all_opts
, opt_renames
[i
].from
, opt_renames
[i
].to
,
883 error_report_err(local_err
);
888 value
= qemu_opt_get(all_opts
, "cache");
893 if (bdrv_parse_cache_mode(value
, &flags
, &writethrough
) != 0) {
894 error_report("invalid cache option");
898 /* Specific options take precedence */
899 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_WB
)) {
900 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_WB
,
901 !writethrough
, &error_abort
);
903 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_DIRECT
)) {
904 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_DIRECT
,
905 !!(flags
& BDRV_O_NOCACHE
), &error_abort
);
907 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_NO_FLUSH
)) {
908 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_NO_FLUSH
,
909 !!(flags
& BDRV_O_NO_FLUSH
), &error_abort
);
911 qemu_opt_unset(all_opts
, "cache");
914 /* Get a QDict for processing the options */
915 bs_opts
= qdict_new();
916 qemu_opts_to_qdict(all_opts
, bs_opts
);
918 legacy_opts
= qemu_opts_create(&qemu_legacy_drive_opts
, NULL
, 0,
920 qemu_opts_absorb_qdict(legacy_opts
, bs_opts
, &local_err
);
922 error_report_err(local_err
);
926 /* Deprecated option boot=[on|off] */
927 if (qemu_opt_get(legacy_opts
, "boot") != NULL
) {
928 fprintf(stderr
, "qemu-kvm: boot=on|off is deprecated and will be "
929 "ignored. Future versions will reject this parameter. Please "
930 "update your scripts.\n");
934 value
= qemu_opt_get(legacy_opts
, "media");
936 if (!strcmp(value
, "disk")) {
938 } else if (!strcmp(value
, "cdrom")) {
942 error_report("'%s' invalid media", value
);
947 /* copy-on-read is disabled with a warning for read-only devices */
948 read_only
|= qemu_opt_get_bool(legacy_opts
, BDRV_OPT_READ_ONLY
, false);
949 copy_on_read
= qemu_opt_get_bool(legacy_opts
, "copy-on-read", false);
951 if (read_only
&& copy_on_read
) {
952 error_report("warning: disabling copy-on-read on read-only drive");
953 copy_on_read
= false;
956 qdict_put(bs_opts
, BDRV_OPT_READ_ONLY
,
957 qstring_from_str(read_only
? "on" : "off"));
958 qdict_put(bs_opts
, "copy-on-read",
959 qstring_from_str(copy_on_read
? "on" :"off"));
961 /* Controller type */
962 value
= qemu_opt_get(legacy_opts
, "if");
965 type
< IF_COUNT
&& strcmp(value
, if_name
[type
]);
968 if (type
== IF_COUNT
) {
969 error_report("unsupported bus type '%s'", value
);
973 type
= block_default_type
;
977 cyls
= qemu_opt_get_number(legacy_opts
, "cyls", 0);
978 heads
= qemu_opt_get_number(legacy_opts
, "heads", 0);
979 secs
= qemu_opt_get_number(legacy_opts
, "secs", 0);
981 if (cyls
|| heads
|| secs
) {
983 error_report("invalid physical cyls number");
987 error_report("invalid physical heads number");
991 error_report("invalid physical secs number");
996 translation
= BIOS_ATA_TRANSLATION_AUTO
;
997 value
= qemu_opt_get(legacy_opts
, "trans");
1000 error_report("'%s' trans must be used with cyls, heads and secs",
1004 if (!strcmp(value
, "none")) {
1005 translation
= BIOS_ATA_TRANSLATION_NONE
;
1006 } else if (!strcmp(value
, "lba")) {
1007 translation
= BIOS_ATA_TRANSLATION_LBA
;
1008 } else if (!strcmp(value
, "large")) {
1009 translation
= BIOS_ATA_TRANSLATION_LARGE
;
1010 } else if (!strcmp(value
, "rechs")) {
1011 translation
= BIOS_ATA_TRANSLATION_RECHS
;
1012 } else if (!strcmp(value
, "auto")) {
1013 translation
= BIOS_ATA_TRANSLATION_AUTO
;
1015 error_report("'%s' invalid translation type", value
);
1020 if (media
== MEDIA_CDROM
) {
1021 if (cyls
|| secs
|| heads
) {
1022 error_report("CHS can't be set with media=cdrom");
1027 /* Device address specified by bus/unit or index.
1028 * If none was specified, try to find the first free one. */
1029 bus_id
= qemu_opt_get_number(legacy_opts
, "bus", 0);
1030 unit_id
= qemu_opt_get_number(legacy_opts
, "unit", -1);
1031 index
= qemu_opt_get_number(legacy_opts
, "index", -1);
1033 max_devs
= if_max_devs
[type
];
1036 if (bus_id
!= 0 || unit_id
!= -1) {
1037 error_report("index cannot be used with bus and unit");
1040 bus_id
= drive_index_to_bus_id(type
, index
);
1041 unit_id
= drive_index_to_unit_id(type
, index
);
1044 if (unit_id
== -1) {
1046 while (drive_get(type
, bus_id
, unit_id
) != NULL
) {
1048 if (max_devs
&& unit_id
>= max_devs
) {
1049 unit_id
-= max_devs
;
1055 if (max_devs
&& unit_id
>= max_devs
) {
1056 error_report("unit %d too big (max is %d)", unit_id
, max_devs
- 1);
1060 if (drive_get(type
, bus_id
, unit_id
) != NULL
) {
1061 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1062 bus_id
, unit_id
, index
);
1067 serial
= qemu_opt_get(legacy_opts
, "serial");
1069 /* no id supplied -> create one */
1070 if (qemu_opts_id(all_opts
) == NULL
) {
1072 const char *mediastr
= "";
1073 if (type
== IF_IDE
|| type
== IF_SCSI
) {
1074 mediastr
= (media
== MEDIA_CDROM
) ? "-cd" : "-hd";
1077 new_id
= g_strdup_printf("%s%i%s%i", if_name
[type
], bus_id
,
1080 new_id
= g_strdup_printf("%s%s%i", if_name
[type
],
1083 qdict_put(bs_opts
, "id", qstring_from_str(new_id
));
1087 /* Add virtio block device */
1088 devaddr
= qemu_opt_get(legacy_opts
, "addr");
1089 if (devaddr
&& type
!= IF_VIRTIO
) {
1090 error_report("addr is not supported by this bus type");
1094 if (type
== IF_VIRTIO
) {
1096 devopts
= qemu_opts_create(qemu_find_opts("device"), NULL
, 0,
1098 if (arch_type
== QEMU_ARCH_S390X
) {
1099 qemu_opt_set(devopts
, "driver", "virtio-blk-ccw", &error_abort
);
1101 qemu_opt_set(devopts
, "driver", "virtio-blk-pci", &error_abort
);
1103 qemu_opt_set(devopts
, "drive", qdict_get_str(bs_opts
, "id"),
1106 qemu_opt_set(devopts
, "addr", devaddr
, &error_abort
);
1110 filename
= qemu_opt_get(legacy_opts
, "file");
1112 /* Check werror/rerror compatibility with if=... */
1113 werror
= qemu_opt_get(legacy_opts
, "werror");
1114 if (werror
!= NULL
) {
1115 if (type
!= IF_IDE
&& type
!= IF_SCSI
&& type
!= IF_VIRTIO
&&
1117 error_report("werror is not supported by this bus type");
1120 qdict_put(bs_opts
, "werror", qstring_from_str(werror
));
1123 rerror
= qemu_opt_get(legacy_opts
, "rerror");
1124 if (rerror
!= NULL
) {
1125 if (type
!= IF_IDE
&& type
!= IF_VIRTIO
&& type
!= IF_SCSI
&&
1127 error_report("rerror is not supported by this bus type");
1130 qdict_put(bs_opts
, "rerror", qstring_from_str(rerror
));
1133 /* Actual block device init: Functionality shared with blockdev-add */
1134 blk
= blockdev_init(filename
, bs_opts
, &local_err
);
1138 error_report_err(local_err
);
1145 /* Create legacy DriveInfo */
1146 dinfo
= g_malloc0(sizeof(*dinfo
));
1147 dinfo
->opts
= all_opts
;
1150 dinfo
->heads
= heads
;
1152 dinfo
->trans
= translation
;
1155 dinfo
->bus
= bus_id
;
1156 dinfo
->unit
= unit_id
;
1157 dinfo
->devaddr
= devaddr
;
1158 dinfo
->serial
= g_strdup(serial
);
1160 blk_set_legacy_dinfo(blk
, dinfo
);
1167 dinfo
->media_cd
= media
== MEDIA_CDROM
;
1174 qemu_opts_del(legacy_opts
);
1179 static BlockDriverState
*qmp_get_root_bs(const char *name
, Error
**errp
)
1181 BlockDriverState
*bs
;
1183 bs
= bdrv_lookup_bs(name
, name
, errp
);
1188 if (!bdrv_is_root_node(bs
)) {
1189 error_setg(errp
, "Need a root block node");
1193 if (!bdrv_is_inserted(bs
)) {
1194 error_setg(errp
, "Device has no medium");
1201 void hmp_commit(Monitor
*mon
, const QDict
*qdict
)
1203 const char *device
= qdict_get_str(qdict
, "device");
1207 if (!strcmp(device
, "all")) {
1208 ret
= blk_commit_all();
1210 BlockDriverState
*bs
;
1211 AioContext
*aio_context
;
1213 blk
= blk_by_name(device
);
1215 monitor_printf(mon
, "Device '%s' not found\n", device
);
1218 if (!blk_is_available(blk
)) {
1219 monitor_printf(mon
, "Device '%s' has no medium\n", device
);
1224 aio_context
= bdrv_get_aio_context(bs
);
1225 aio_context_acquire(aio_context
);
1227 ret
= bdrv_commit(bs
);
1229 aio_context_release(aio_context
);
1232 monitor_printf(mon
, "'commit' error for '%s': %s\n", device
,
1237 static void blockdev_do_action(TransactionAction
*action
, Error
**errp
)
1239 TransactionActionList list
;
1241 list
.value
= action
;
1243 qmp_transaction(&list
, false, NULL
, errp
);
1246 void qmp_blockdev_snapshot_sync(bool has_device
, const char *device
,
1247 bool has_node_name
, const char *node_name
,
1248 const char *snapshot_file
,
1249 bool has_snapshot_node_name
,
1250 const char *snapshot_node_name
,
1251 bool has_format
, const char *format
,
1252 bool has_mode
, NewImageMode mode
, Error
**errp
)
1254 BlockdevSnapshotSync snapshot
= {
1255 .has_device
= has_device
,
1256 .device
= (char *) device
,
1257 .has_node_name
= has_node_name
,
1258 .node_name
= (char *) node_name
,
1259 .snapshot_file
= (char *) snapshot_file
,
1260 .has_snapshot_node_name
= has_snapshot_node_name
,
1261 .snapshot_node_name
= (char *) snapshot_node_name
,
1262 .has_format
= has_format
,
1263 .format
= (char *) format
,
1264 .has_mode
= has_mode
,
1267 TransactionAction action
= {
1268 .type
= TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
,
1269 .u
.blockdev_snapshot_sync
.data
= &snapshot
,
1271 blockdev_do_action(&action
, errp
);
1274 void qmp_blockdev_snapshot(const char *node
, const char *overlay
,
1277 BlockdevSnapshot snapshot_data
= {
1278 .node
= (char *) node
,
1279 .overlay
= (char *) overlay
1281 TransactionAction action
= {
1282 .type
= TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT
,
1283 .u
.blockdev_snapshot
.data
= &snapshot_data
,
1285 blockdev_do_action(&action
, errp
);
1288 void qmp_blockdev_snapshot_internal_sync(const char *device
,
1292 BlockdevSnapshotInternal snapshot
= {
1293 .device
= (char *) device
,
1294 .name
= (char *) name
1296 TransactionAction action
= {
1297 .type
= TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
,
1298 .u
.blockdev_snapshot_internal_sync
.data
= &snapshot
,
1300 blockdev_do_action(&action
, errp
);
1303 SnapshotInfo
*qmp_blockdev_snapshot_delete_internal_sync(const char *device
,
1310 BlockDriverState
*bs
;
1311 AioContext
*aio_context
;
1312 QEMUSnapshotInfo sn
;
1313 Error
*local_err
= NULL
;
1314 SnapshotInfo
*info
= NULL
;
1317 bs
= qmp_get_root_bs(device
, errp
);
1321 aio_context
= bdrv_get_aio_context(bs
);
1322 aio_context_acquire(aio_context
);
1333 error_setg(errp
, "Name or id must be provided");
1334 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
;
1516 BlockDriverState
*bs
;
1517 QEMUSnapshotInfo old_sn
, *sn
;
1520 BlockdevSnapshotInternal
*internal
;
1521 InternalSnapshotState
*state
;
1524 g_assert(common
->action
->type
==
1525 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
);
1526 internal
= common
->action
->u
.blockdev_snapshot_internal_sync
.data
;
1527 state
= DO_UPCAST(InternalSnapshotState
, common
, common
);
1529 /* 1. parse input */
1530 device
= internal
->device
;
1531 name
= internal
->name
;
1533 /* 2. check for validation */
1534 if (action_check_completion_mode(common
, errp
) < 0) {
1538 bs
= qmp_get_root_bs(device
, errp
);
1543 /* AioContext is released in .clean() */
1544 state
->aio_context
= bdrv_get_aio_context(bs
);
1545 aio_context_acquire(state
->aio_context
);
1548 bdrv_drained_begin(bs
);
1550 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT
, errp
)) {
1554 if (bdrv_is_read_only(bs
)) {
1555 error_setg(errp
, "Device '%s' is read only", device
);
1559 if (!bdrv_can_snapshot(bs
)) {
1560 error_setg(errp
, "Block format '%s' used by device '%s' "
1561 "does not support internal snapshots",
1562 bs
->drv
->format_name
, device
);
1566 if (!strlen(name
)) {
1567 error_setg(errp
, "Name is empty");
1571 /* check whether a snapshot with name exist */
1572 ret
= bdrv_snapshot_find_by_id_and_name(bs
, NULL
, name
, &old_sn
,
1575 error_propagate(errp
, local_err
);
1579 "Snapshot with name '%s' already exists on device '%s'",
1584 /* 3. take the snapshot */
1586 pstrcpy(sn
->name
, sizeof(sn
->name
), name
);
1587 qemu_gettimeofday(&tv
);
1588 sn
->date_sec
= tv
.tv_sec
;
1589 sn
->date_nsec
= tv
.tv_usec
* 1000;
1590 sn
->vm_clock_nsec
= qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
);
1592 ret1
= bdrv_snapshot_create(bs
, sn
);
1594 error_setg_errno(errp
, -ret1
,
1595 "Failed to create snapshot '%s' on device '%s'",
1600 /* 4. succeed, mark a snapshot is created */
1601 state
->created
= true;
1604 static void internal_snapshot_abort(BlkActionState
*common
)
1606 InternalSnapshotState
*state
=
1607 DO_UPCAST(InternalSnapshotState
, common
, common
);
1608 BlockDriverState
*bs
= state
->bs
;
1609 QEMUSnapshotInfo
*sn
= &state
->sn
;
1610 Error
*local_error
= NULL
;
1612 if (!state
->created
) {
1616 if (bdrv_snapshot_delete(bs
, sn
->id_str
, sn
->name
, &local_error
) < 0) {
1617 error_reportf_err(local_error
,
1618 "Failed to delete snapshot with id '%s' and "
1619 "name '%s' on device '%s' in abort: ",
1620 sn
->id_str
, sn
->name
,
1621 bdrv_get_device_name(bs
));
1625 static void internal_snapshot_clean(BlkActionState
*common
)
1627 InternalSnapshotState
*state
= DO_UPCAST(InternalSnapshotState
,
1630 if (state
->aio_context
) {
1632 bdrv_drained_end(state
->bs
);
1634 aio_context_release(state
->aio_context
);
1638 /* external snapshot private data */
1639 typedef struct ExternalSnapshotState
{
1640 BlkActionState common
;
1641 BlockDriverState
*old_bs
;
1642 BlockDriverState
*new_bs
;
1643 AioContext
*aio_context
;
1644 } ExternalSnapshotState
;
1646 static void external_snapshot_prepare(BlkActionState
*common
,
1650 QDict
*options
= NULL
;
1651 Error
*local_err
= NULL
;
1652 /* Device and node name of the image to generate the snapshot from */
1654 const char *node_name
;
1655 /* Reference to the new image (for 'blockdev-snapshot') */
1656 const char *snapshot_ref
;
1657 /* File name of the new image (for 'blockdev-snapshot-sync') */
1658 const char *new_image_file
;
1659 ExternalSnapshotState
*state
=
1660 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1661 TransactionAction
*action
= common
->action
;
1663 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1664 * purpose but a different set of parameters */
1665 switch (action
->type
) {
1666 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT
:
1668 BlockdevSnapshot
*s
= action
->u
.blockdev_snapshot
.data
;
1670 node_name
= s
->node
;
1671 new_image_file
= NULL
;
1672 snapshot_ref
= s
->overlay
;
1675 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
:
1677 BlockdevSnapshotSync
*s
= action
->u
.blockdev_snapshot_sync
.data
;
1678 device
= s
->has_device
? s
->device
: NULL
;
1679 node_name
= s
->has_node_name
? s
->node_name
: NULL
;
1680 new_image_file
= s
->snapshot_file
;
1681 snapshot_ref
= NULL
;
1685 g_assert_not_reached();
1688 /* start processing */
1689 if (action_check_completion_mode(common
, errp
) < 0) {
1693 state
->old_bs
= bdrv_lookup_bs(device
, node_name
, errp
);
1694 if (!state
->old_bs
) {
1698 /* Acquire AioContext now so any threads operating on old_bs stop */
1699 state
->aio_context
= bdrv_get_aio_context(state
->old_bs
);
1700 aio_context_acquire(state
->aio_context
);
1701 bdrv_drained_begin(state
->old_bs
);
1703 if (!bdrv_is_inserted(state
->old_bs
)) {
1704 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1708 if (bdrv_op_is_blocked(state
->old_bs
,
1709 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
, errp
)) {
1713 if (!bdrv_is_read_only(state
->old_bs
)) {
1714 if (bdrv_flush(state
->old_bs
)) {
1715 error_setg(errp
, QERR_IO_ERROR
);
1720 if (!bdrv_is_first_non_filter(state
->old_bs
)) {
1721 error_setg(errp
, QERR_FEATURE_DISABLED
, "snapshot");
1725 if (action
->type
== TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
) {
1726 BlockdevSnapshotSync
*s
= action
->u
.blockdev_snapshot_sync
.data
;
1727 const char *format
= s
->has_format
? s
->format
: "qcow2";
1728 enum NewImageMode mode
;
1729 const char *snapshot_node_name
=
1730 s
->has_snapshot_node_name
? s
->snapshot_node_name
: NULL
;
1732 if (node_name
&& !snapshot_node_name
) {
1733 error_setg(errp
, "New snapshot node name missing");
1737 if (snapshot_node_name
&&
1738 bdrv_lookup_bs(snapshot_node_name
, snapshot_node_name
, NULL
)) {
1739 error_setg(errp
, "New snapshot node name already in use");
1743 flags
= state
->old_bs
->open_flags
;
1744 flags
&= ~(BDRV_O_SNAPSHOT
| BDRV_O_NO_BACKING
| BDRV_O_COPY_ON_READ
);
1746 /* create new image w/backing file */
1747 mode
= s
->has_mode
? s
->mode
: NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
1748 if (mode
!= NEW_IMAGE_MODE_EXISTING
) {
1749 int64_t size
= bdrv_getlength(state
->old_bs
);
1751 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
1754 bdrv_img_create(new_image_file
, format
,
1755 state
->old_bs
->filename
,
1756 state
->old_bs
->drv
->format_name
,
1757 NULL
, size
, flags
, &local_err
, false);
1759 error_propagate(errp
, local_err
);
1764 options
= qdict_new();
1765 if (s
->has_snapshot_node_name
) {
1766 qdict_put(options
, "node-name",
1767 qstring_from_str(snapshot_node_name
));
1769 qdict_put(options
, "driver", qstring_from_str(format
));
1771 flags
|= BDRV_O_NO_BACKING
;
1774 state
->new_bs
= bdrv_open(new_image_file
, snapshot_ref
, options
, flags
,
1776 /* We will manually add the backing_hd field to the bs later */
1777 if (!state
->new_bs
) {
1781 if (bdrv_has_blk(state
->new_bs
)) {
1782 error_setg(errp
, "The snapshot is already in use by %s",
1783 bdrv_get_parent_name(state
->new_bs
));
1787 if (bdrv_op_is_blocked(state
->new_bs
, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
,
1792 if (state
->new_bs
->backing
!= NULL
) {
1793 error_setg(errp
, "The snapshot already has a backing image");
1797 if (!state
->new_bs
->drv
->supports_backing
) {
1798 error_setg(errp
, "The snapshot does not support backing images");
1802 static void external_snapshot_commit(BlkActionState
*common
)
1804 ExternalSnapshotState
*state
=
1805 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1807 bdrv_set_aio_context(state
->new_bs
, state
->aio_context
);
1809 /* This removes our old bs and adds the new bs */
1810 bdrv_append(state
->new_bs
, state
->old_bs
);
1811 /* We don't need (or want) to use the transactional
1812 * bdrv_reopen_multiple() across all the entries at once, because we
1813 * don't want to abort all of them if one of them fails the reopen */
1814 if (!state
->old_bs
->copy_on_read
) {
1815 bdrv_reopen(state
->old_bs
, state
->old_bs
->open_flags
& ~BDRV_O_RDWR
,
1820 static void external_snapshot_abort(BlkActionState
*common
)
1822 ExternalSnapshotState
*state
=
1823 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1824 if (state
->new_bs
) {
1825 bdrv_unref(state
->new_bs
);
1829 static void external_snapshot_clean(BlkActionState
*common
)
1831 ExternalSnapshotState
*state
=
1832 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1833 if (state
->aio_context
) {
1834 bdrv_drained_end(state
->old_bs
);
1835 aio_context_release(state
->aio_context
);
1839 typedef struct DriveBackupState
{
1840 BlkActionState common
;
1841 BlockDriverState
*bs
;
1842 AioContext
*aio_context
;
1846 static void do_drive_backup(DriveBackup
*backup
, BlockJobTxn
*txn
,
1849 static void drive_backup_prepare(BlkActionState
*common
, Error
**errp
)
1851 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1852 BlockDriverState
*bs
;
1853 DriveBackup
*backup
;
1854 Error
*local_err
= NULL
;
1856 assert(common
->action
->type
== TRANSACTION_ACTION_KIND_DRIVE_BACKUP
);
1857 backup
= common
->action
->u
.drive_backup
.data
;
1859 bs
= qmp_get_root_bs(backup
->device
, errp
);
1864 /* AioContext is released in .clean() */
1865 state
->aio_context
= bdrv_get_aio_context(bs
);
1866 aio_context_acquire(state
->aio_context
);
1867 bdrv_drained_begin(bs
);
1870 do_drive_backup(backup
, common
->block_job_txn
, &local_err
);
1872 error_propagate(errp
, local_err
);
1876 state
->job
= state
->bs
->job
;
1879 static void drive_backup_abort(BlkActionState
*common
)
1881 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1882 BlockDriverState
*bs
= state
->bs
;
1884 /* Only cancel if it's the job we started */
1885 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
1886 block_job_cancel_sync(bs
->job
);
1890 static void drive_backup_clean(BlkActionState
*common
)
1892 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1894 if (state
->aio_context
) {
1895 bdrv_drained_end(state
->bs
);
1896 aio_context_release(state
->aio_context
);
1900 typedef struct BlockdevBackupState
{
1901 BlkActionState common
;
1902 BlockDriverState
*bs
;
1904 AioContext
*aio_context
;
1905 } BlockdevBackupState
;
1907 static void do_blockdev_backup(BlockdevBackup
*backup
, BlockJobTxn
*txn
,
1910 static void blockdev_backup_prepare(BlkActionState
*common
, Error
**errp
)
1912 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1913 BlockdevBackup
*backup
;
1914 BlockDriverState
*bs
, *target
;
1915 Error
*local_err
= NULL
;
1917 assert(common
->action
->type
== TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP
);
1918 backup
= common
->action
->u
.blockdev_backup
.data
;
1920 bs
= qmp_get_root_bs(backup
->device
, errp
);
1925 target
= bdrv_lookup_bs(backup
->target
, backup
->target
, errp
);
1930 /* AioContext is released in .clean() */
1931 state
->aio_context
= bdrv_get_aio_context(bs
);
1932 if (state
->aio_context
!= bdrv_get_aio_context(target
)) {
1933 state
->aio_context
= NULL
;
1934 error_setg(errp
, "Backup between two IO threads is not implemented");
1937 aio_context_acquire(state
->aio_context
);
1939 bdrv_drained_begin(state
->bs
);
1941 do_blockdev_backup(backup
, common
->block_job_txn
, &local_err
);
1943 error_propagate(errp
, local_err
);
1947 state
->job
= state
->bs
->job
;
1950 static void blockdev_backup_abort(BlkActionState
*common
)
1952 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1953 BlockDriverState
*bs
= state
->bs
;
1955 /* Only cancel if it's the job we started */
1956 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
1957 block_job_cancel_sync(bs
->job
);
1961 static void blockdev_backup_clean(BlkActionState
*common
)
1963 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1965 if (state
->aio_context
) {
1966 bdrv_drained_end(state
->bs
);
1967 aio_context_release(state
->aio_context
);
1971 typedef struct BlockDirtyBitmapState
{
1972 BlkActionState common
;
1973 BdrvDirtyBitmap
*bitmap
;
1974 BlockDriverState
*bs
;
1975 AioContext
*aio_context
;
1978 } BlockDirtyBitmapState
;
1980 static void block_dirty_bitmap_add_prepare(BlkActionState
*common
,
1983 Error
*local_err
= NULL
;
1984 BlockDirtyBitmapAdd
*action
;
1985 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
1988 if (action_check_completion_mode(common
, errp
) < 0) {
1992 action
= common
->action
->u
.block_dirty_bitmap_add
.data
;
1993 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1994 qmp_block_dirty_bitmap_add(action
->node
, action
->name
,
1995 action
->has_granularity
, action
->granularity
,
1999 state
->prepared
= true;
2001 error_propagate(errp
, local_err
);
2005 static void block_dirty_bitmap_add_abort(BlkActionState
*common
)
2007 BlockDirtyBitmapAdd
*action
;
2008 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2011 action
= common
->action
->u
.block_dirty_bitmap_add
.data
;
2012 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2013 * then the node reference and bitmap name must have been valid.
2015 if (state
->prepared
) {
2016 qmp_block_dirty_bitmap_remove(action
->node
, action
->name
, &error_abort
);
2020 static void block_dirty_bitmap_clear_prepare(BlkActionState
*common
,
2023 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2025 BlockDirtyBitmap
*action
;
2027 if (action_check_completion_mode(common
, errp
) < 0) {
2031 action
= common
->action
->u
.block_dirty_bitmap_clear
.data
;
2032 state
->bitmap
= block_dirty_bitmap_lookup(action
->node
,
2035 &state
->aio_context
,
2037 if (!state
->bitmap
) {
2041 if (bdrv_dirty_bitmap_frozen(state
->bitmap
)) {
2042 error_setg(errp
, "Cannot modify a frozen bitmap");
2044 } else if (!bdrv_dirty_bitmap_enabled(state
->bitmap
)) {
2045 error_setg(errp
, "Cannot clear a disabled bitmap");
2049 bdrv_clear_dirty_bitmap(state
->bitmap
, &state
->backup
);
2050 /* AioContext is released in .clean() */
2053 static void block_dirty_bitmap_clear_abort(BlkActionState
*common
)
2055 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2058 bdrv_undo_clear_dirty_bitmap(state
->bitmap
, state
->backup
);
2061 static void block_dirty_bitmap_clear_commit(BlkActionState
*common
)
2063 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2066 hbitmap_free(state
->backup
);
2069 static void block_dirty_bitmap_clear_clean(BlkActionState
*common
)
2071 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2074 if (state
->aio_context
) {
2075 aio_context_release(state
->aio_context
);
2079 static void abort_prepare(BlkActionState
*common
, Error
**errp
)
2081 error_setg(errp
, "Transaction aborted using Abort action");
2084 static void abort_commit(BlkActionState
*common
)
2086 g_assert_not_reached(); /* this action never succeeds */
2089 static const BlkActionOps actions
[] = {
2090 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT
] = {
2091 .instance_size
= sizeof(ExternalSnapshotState
),
2092 .prepare
= external_snapshot_prepare
,
2093 .commit
= external_snapshot_commit
,
2094 .abort
= external_snapshot_abort
,
2095 .clean
= external_snapshot_clean
,
2097 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
] = {
2098 .instance_size
= sizeof(ExternalSnapshotState
),
2099 .prepare
= external_snapshot_prepare
,
2100 .commit
= external_snapshot_commit
,
2101 .abort
= external_snapshot_abort
,
2102 .clean
= external_snapshot_clean
,
2104 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP
] = {
2105 .instance_size
= sizeof(DriveBackupState
),
2106 .prepare
= drive_backup_prepare
,
2107 .abort
= drive_backup_abort
,
2108 .clean
= drive_backup_clean
,
2110 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP
] = {
2111 .instance_size
= sizeof(BlockdevBackupState
),
2112 .prepare
= blockdev_backup_prepare
,
2113 .abort
= blockdev_backup_abort
,
2114 .clean
= blockdev_backup_clean
,
2116 [TRANSACTION_ACTION_KIND_ABORT
] = {
2117 .instance_size
= sizeof(BlkActionState
),
2118 .prepare
= abort_prepare
,
2119 .commit
= abort_commit
,
2121 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
] = {
2122 .instance_size
= sizeof(InternalSnapshotState
),
2123 .prepare
= internal_snapshot_prepare
,
2124 .abort
= internal_snapshot_abort
,
2125 .clean
= internal_snapshot_clean
,
2127 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD
] = {
2128 .instance_size
= sizeof(BlockDirtyBitmapState
),
2129 .prepare
= block_dirty_bitmap_add_prepare
,
2130 .abort
= block_dirty_bitmap_add_abort
,
2132 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR
] = {
2133 .instance_size
= sizeof(BlockDirtyBitmapState
),
2134 .prepare
= block_dirty_bitmap_clear_prepare
,
2135 .commit
= block_dirty_bitmap_clear_commit
,
2136 .abort
= block_dirty_bitmap_clear_abort
,
2137 .clean
= block_dirty_bitmap_clear_clean
,
2142 * Allocate a TransactionProperties structure if necessary, and fill
2143 * that structure with desired defaults if they are unset.
2145 static TransactionProperties
*get_transaction_properties(
2146 TransactionProperties
*props
)
2149 props
= g_new0(TransactionProperties
, 1);
2152 if (!props
->has_completion_mode
) {
2153 props
->has_completion_mode
= true;
2154 props
->completion_mode
= ACTION_COMPLETION_MODE_INDIVIDUAL
;
2161 * 'Atomic' group operations. The operations are performed as a set, and if
2162 * any fail then we roll back all operations in the group.
2164 void qmp_transaction(TransactionActionList
*dev_list
,
2166 struct TransactionProperties
*props
,
2169 TransactionActionList
*dev_entry
= dev_list
;
2170 BlockJobTxn
*block_job_txn
= NULL
;
2171 BlkActionState
*state
, *next
;
2172 Error
*local_err
= NULL
;
2174 QSIMPLEQ_HEAD(snap_bdrv_states
, BlkActionState
) snap_bdrv_states
;
2175 QSIMPLEQ_INIT(&snap_bdrv_states
);
2177 /* Does this transaction get canceled as a group on failure?
2178 * If not, we don't really need to make a BlockJobTxn.
2180 props
= get_transaction_properties(props
);
2181 if (props
->completion_mode
!= ACTION_COMPLETION_MODE_INDIVIDUAL
) {
2182 block_job_txn
= block_job_txn_new();
2185 /* drain all i/o before any operations */
2188 /* We don't do anything in this loop that commits us to the operations */
2189 while (NULL
!= dev_entry
) {
2190 TransactionAction
*dev_info
= NULL
;
2191 const BlkActionOps
*ops
;
2193 dev_info
= dev_entry
->value
;
2194 dev_entry
= dev_entry
->next
;
2196 assert(dev_info
->type
< ARRAY_SIZE(actions
));
2198 ops
= &actions
[dev_info
->type
];
2199 assert(ops
->instance_size
> 0);
2201 state
= g_malloc0(ops
->instance_size
);
2203 state
->action
= dev_info
;
2204 state
->block_job_txn
= block_job_txn
;
2205 state
->txn_props
= props
;
2206 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states
, state
, entry
);
2208 state
->ops
->prepare(state
, &local_err
);
2210 error_propagate(errp
, local_err
);
2211 goto delete_and_fail
;
2215 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
2216 if (state
->ops
->commit
) {
2217 state
->ops
->commit(state
);
2225 /* failure, and it is all-or-none; roll back all operations */
2226 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
2227 if (state
->ops
->abort
) {
2228 state
->ops
->abort(state
);
2232 QSIMPLEQ_FOREACH_SAFE(state
, &snap_bdrv_states
, entry
, next
) {
2233 if (state
->ops
->clean
) {
2234 state
->ops
->clean(state
);
2239 qapi_free_TransactionProperties(props
);
2241 block_job_txn_unref(block_job_txn
);
2244 void qmp_eject(const char *device
, bool has_force
, bool force
, Error
**errp
)
2246 Error
*local_err
= NULL
;
2253 rc
= do_open_tray(device
, force
, &local_err
);
2254 if (rc
&& rc
!= -ENOSYS
) {
2255 error_propagate(errp
, local_err
);
2258 error_free(local_err
);
2260 qmp_x_blockdev_remove_medium(device
, errp
);
2263 void qmp_block_passwd(bool has_device
, const char *device
,
2264 bool has_node_name
, const char *node_name
,
2265 const char *password
, Error
**errp
)
2267 Error
*local_err
= NULL
;
2268 BlockDriverState
*bs
;
2269 AioContext
*aio_context
;
2271 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
2272 has_node_name
? node_name
: NULL
,
2275 error_propagate(errp
, local_err
);
2279 aio_context
= bdrv_get_aio_context(bs
);
2280 aio_context_acquire(aio_context
);
2282 bdrv_add_key(bs
, password
, errp
);
2284 aio_context_release(aio_context
);
2288 * Attempt to open the tray of @device.
2289 * If @force, ignore its tray lock.
2290 * Else, if the tray is locked, don't open it, but ask the guest to open it.
2291 * On error, store an error through @errp and return -errno.
2292 * If @device does not exist, return -ENODEV.
2293 * If it has no removable media, return -ENOTSUP.
2294 * If it has no tray, return -ENOSYS.
2295 * If the guest was asked to open the tray, return -EINPROGRESS.
2298 static int do_open_tray(const char *device
, bool force
, Error
**errp
)
2303 blk
= blk_by_name(device
);
2305 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2306 "Device '%s' not found", device
);
2310 if (!blk_dev_has_removable_media(blk
)) {
2311 error_setg(errp
, "Device '%s' is not removable", device
);
2315 if (!blk_dev_has_tray(blk
)) {
2316 error_setg(errp
, "Device '%s' does not have a tray", device
);
2320 if (blk_dev_is_tray_open(blk
)) {
2324 locked
= blk_dev_is_medium_locked(blk
);
2326 blk_dev_eject_request(blk
, force
);
2329 if (!locked
|| force
) {
2330 blk_dev_change_media_cb(blk
, false);
2333 if (locked
&& !force
) {
2334 error_setg(errp
, "Device '%s' is locked and force was not specified, "
2335 "wait for tray to open and try again", device
);
2336 return -EINPROGRESS
;
2342 void qmp_blockdev_open_tray(const char *device
, bool has_force
, bool force
,
2345 Error
*local_err
= NULL
;
2351 rc
= do_open_tray(device
, force
, &local_err
);
2352 if (rc
&& rc
!= -ENOSYS
&& rc
!= -EINPROGRESS
) {
2353 error_propagate(errp
, local_err
);
2356 error_free(local_err
);
2359 void qmp_blockdev_close_tray(const char *device
, Error
**errp
)
2363 blk
= blk_by_name(device
);
2365 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2366 "Device '%s' not found", device
);
2370 if (!blk_dev_has_removable_media(blk
)) {
2371 error_setg(errp
, "Device '%s' is not removable", device
);
2375 if (!blk_dev_has_tray(blk
)) {
2376 /* Ignore this command on tray-less devices */
2380 if (!blk_dev_is_tray_open(blk
)) {
2384 blk_dev_change_media_cb(blk
, true);
2387 void qmp_x_blockdev_remove_medium(const char *device
, Error
**errp
)
2390 BlockDriverState
*bs
;
2391 AioContext
*aio_context
;
2394 blk
= blk_by_name(device
);
2396 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2397 "Device '%s' not found", device
);
2401 /* For BBs without a device, we can exchange the BDS tree at will */
2402 has_device
= blk_get_attached_dev(blk
);
2404 if (has_device
&& !blk_dev_has_removable_media(blk
)) {
2405 error_setg(errp
, "Device '%s' is not removable", device
);
2409 if (has_device
&& blk_dev_has_tray(blk
) && !blk_dev_is_tray_open(blk
)) {
2410 error_setg(errp
, "Tray of device '%s' is not open", device
);
2419 aio_context
= bdrv_get_aio_context(bs
);
2420 aio_context_acquire(aio_context
);
2422 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_EJECT
, errp
)) {
2428 if (!blk_dev_has_tray(blk
)) {
2429 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2430 * called at all); therefore, the medium needs to be ejected here.
2431 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2432 * value passed here (i.e. false). */
2433 blk_dev_change_media_cb(blk
, false);
2437 aio_context_release(aio_context
);
2440 static void qmp_blockdev_insert_anon_medium(const char *device
,
2441 BlockDriverState
*bs
, Error
**errp
)
2446 blk
= blk_by_name(device
);
2448 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2449 "Device '%s' not found", device
);
2453 /* For BBs without a device, we can exchange the BDS tree at will */
2454 has_device
= blk_get_attached_dev(blk
);
2456 if (has_device
&& !blk_dev_has_removable_media(blk
)) {
2457 error_setg(errp
, "Device '%s' is not removable", device
);
2461 if (has_device
&& blk_dev_has_tray(blk
) && !blk_dev_is_tray_open(blk
)) {
2462 error_setg(errp
, "Tray of device '%s' is not open", device
);
2467 error_setg(errp
, "There already is a medium in device '%s'", device
);
2471 blk_insert_bs(blk
, bs
);
2473 if (!blk_dev_has_tray(blk
)) {
2474 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2475 * called at all); therefore, the medium needs to be pushed into the
2477 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2478 * value passed here (i.e. true). */
2479 blk_dev_change_media_cb(blk
, true);
2483 void qmp_x_blockdev_insert_medium(const char *device
, const char *node_name
,
2486 BlockDriverState
*bs
;
2488 bs
= bdrv_find_node(node_name
);
2490 error_setg(errp
, "Node '%s' not found", node_name
);
2494 if (bdrv_has_blk(bs
)) {
2495 error_setg(errp
, "Node '%s' is already in use by '%s'", node_name
,
2496 bdrv_get_parent_name(bs
));
2500 qmp_blockdev_insert_anon_medium(device
, bs
, errp
);
2503 void qmp_blockdev_change_medium(const char *device
, const char *filename
,
2504 bool has_format
, const char *format
,
2506 BlockdevChangeReadOnlyMode read_only
,
2510 BlockDriverState
*medium_bs
= NULL
;
2513 QDict
*options
= NULL
;
2516 blk
= blk_by_name(device
);
2518 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2519 "Device '%s' not found", device
);
2524 blk_update_root_state(blk
);
2527 bdrv_flags
= blk_get_open_flags_from_root_state(blk
);
2528 bdrv_flags
&= ~(BDRV_O_TEMPORARY
| BDRV_O_SNAPSHOT
| BDRV_O_NO_BACKING
|
2531 if (!has_read_only
) {
2532 read_only
= BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN
;
2535 switch (read_only
) {
2536 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN
:
2539 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY
:
2540 bdrv_flags
&= ~BDRV_O_RDWR
;
2543 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE
:
2544 bdrv_flags
|= BDRV_O_RDWR
;
2552 options
= qdict_new();
2553 qdict_put(options
, "driver", qstring_from_str(format
));
2556 medium_bs
= bdrv_open(filename
, NULL
, options
, bdrv_flags
, errp
);
2561 bdrv_add_key(medium_bs
, NULL
, &err
);
2563 error_propagate(errp
, err
);
2567 rc
= do_open_tray(device
, false, &err
);
2568 if (rc
&& rc
!= -ENOSYS
) {
2569 error_propagate(errp
, err
);
2575 qmp_x_blockdev_remove_medium(device
, &err
);
2577 error_propagate(errp
, err
);
2581 qmp_blockdev_insert_anon_medium(device
, medium_bs
, &err
);
2583 error_propagate(errp
, err
);
2587 blk_apply_root_state(blk
, medium_bs
);
2589 qmp_blockdev_close_tray(device
, errp
);
2592 /* If the medium has been inserted, the device has its own reference, so
2593 * ours must be relinquished; and if it has not been inserted successfully,
2594 * the reference must be relinquished anyway */
2595 bdrv_unref(medium_bs
);
2598 /* throttling disk I/O limits */
2599 void qmp_block_set_io_throttle(BlockIOThrottle
*arg
, Error
**errp
)
2602 BlockDriverState
*bs
;
2604 AioContext
*aio_context
;
2606 blk
= blk_by_name(arg
->device
);
2608 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2609 "Device '%s' not found", arg
->device
);
2613 aio_context
= blk_get_aio_context(blk
);
2614 aio_context_acquire(aio_context
);
2618 error_setg(errp
, "Device '%s' has no medium", arg
->device
);
2622 throttle_config_init(&cfg
);
2623 cfg
.buckets
[THROTTLE_BPS_TOTAL
].avg
= arg
->bps
;
2624 cfg
.buckets
[THROTTLE_BPS_READ
].avg
= arg
->bps_rd
;
2625 cfg
.buckets
[THROTTLE_BPS_WRITE
].avg
= arg
->bps_wr
;
2627 cfg
.buckets
[THROTTLE_OPS_TOTAL
].avg
= arg
->iops
;
2628 cfg
.buckets
[THROTTLE_OPS_READ
].avg
= arg
->iops_rd
;
2629 cfg
.buckets
[THROTTLE_OPS_WRITE
].avg
= arg
->iops_wr
;
2631 if (arg
->has_bps_max
) {
2632 cfg
.buckets
[THROTTLE_BPS_TOTAL
].max
= arg
->bps_max
;
2634 if (arg
->has_bps_rd_max
) {
2635 cfg
.buckets
[THROTTLE_BPS_READ
].max
= arg
->bps_rd_max
;
2637 if (arg
->has_bps_wr_max
) {
2638 cfg
.buckets
[THROTTLE_BPS_WRITE
].max
= arg
->bps_wr_max
;
2640 if (arg
->has_iops_max
) {
2641 cfg
.buckets
[THROTTLE_OPS_TOTAL
].max
= arg
->iops_max
;
2643 if (arg
->has_iops_rd_max
) {
2644 cfg
.buckets
[THROTTLE_OPS_READ
].max
= arg
->iops_rd_max
;
2646 if (arg
->has_iops_wr_max
) {
2647 cfg
.buckets
[THROTTLE_OPS_WRITE
].max
= arg
->iops_wr_max
;
2650 if (arg
->has_bps_max_length
) {
2651 cfg
.buckets
[THROTTLE_BPS_TOTAL
].burst_length
= arg
->bps_max_length
;
2653 if (arg
->has_bps_rd_max_length
) {
2654 cfg
.buckets
[THROTTLE_BPS_READ
].burst_length
= arg
->bps_rd_max_length
;
2656 if (arg
->has_bps_wr_max_length
) {
2657 cfg
.buckets
[THROTTLE_BPS_WRITE
].burst_length
= arg
->bps_wr_max_length
;
2659 if (arg
->has_iops_max_length
) {
2660 cfg
.buckets
[THROTTLE_OPS_TOTAL
].burst_length
= arg
->iops_max_length
;
2662 if (arg
->has_iops_rd_max_length
) {
2663 cfg
.buckets
[THROTTLE_OPS_READ
].burst_length
= arg
->iops_rd_max_length
;
2665 if (arg
->has_iops_wr_max_length
) {
2666 cfg
.buckets
[THROTTLE_OPS_WRITE
].burst_length
= arg
->iops_wr_max_length
;
2669 if (arg
->has_iops_size
) {
2670 cfg
.op_size
= arg
->iops_size
;
2673 if (!throttle_is_valid(&cfg
, errp
)) {
2677 if (throttle_enabled(&cfg
)) {
2678 /* Enable I/O limits if they're not enabled yet, otherwise
2679 * just update the throttling group. */
2680 if (!blk_get_public(blk
)->throttle_state
) {
2681 blk_io_limits_enable(blk
,
2682 arg
->has_group
? arg
->group
: arg
->device
);
2683 } else if (arg
->has_group
) {
2684 blk_io_limits_update_group(blk
, arg
->group
);
2686 /* Set the new throttling configuration */
2687 blk_set_io_limits(blk
, &cfg
);
2688 } else if (blk_get_public(blk
)->throttle_state
) {
2689 /* If all throttling settings are set to 0, disable I/O limits */
2690 blk_io_limits_disable(blk
);
2694 aio_context_release(aio_context
);
2697 void qmp_block_dirty_bitmap_add(const char *node
, const char *name
,
2698 bool has_granularity
, uint32_t granularity
,
2701 AioContext
*aio_context
;
2702 BlockDriverState
*bs
;
2704 if (!name
|| name
[0] == '\0') {
2705 error_setg(errp
, "Bitmap name cannot be empty");
2709 bs
= bdrv_lookup_bs(node
, node
, errp
);
2714 aio_context
= bdrv_get_aio_context(bs
);
2715 aio_context_acquire(aio_context
);
2717 if (has_granularity
) {
2718 if (granularity
< 512 || !is_power_of_2(granularity
)) {
2719 error_setg(errp
, "Granularity must be power of 2 "
2720 "and at least 512");
2724 /* Default to cluster size, if available: */
2725 granularity
= bdrv_get_default_bitmap_granularity(bs
);
2728 bdrv_create_dirty_bitmap(bs
, granularity
, name
, errp
);
2731 aio_context_release(aio_context
);
2734 void qmp_block_dirty_bitmap_remove(const char *node
, const char *name
,
2737 AioContext
*aio_context
;
2738 BlockDriverState
*bs
;
2739 BdrvDirtyBitmap
*bitmap
;
2741 bitmap
= block_dirty_bitmap_lookup(node
, name
, &bs
, &aio_context
, errp
);
2742 if (!bitmap
|| !bs
) {
2746 if (bdrv_dirty_bitmap_frozen(bitmap
)) {
2748 "Bitmap '%s' is currently frozen and cannot be removed",
2752 bdrv_dirty_bitmap_make_anon(bitmap
);
2753 bdrv_release_dirty_bitmap(bs
, bitmap
);
2756 aio_context_release(aio_context
);
2760 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2761 * immediately after a full backup operation.
2763 void qmp_block_dirty_bitmap_clear(const char *node
, const char *name
,
2766 AioContext
*aio_context
;
2767 BdrvDirtyBitmap
*bitmap
;
2768 BlockDriverState
*bs
;
2770 bitmap
= block_dirty_bitmap_lookup(node
, name
, &bs
, &aio_context
, errp
);
2771 if (!bitmap
|| !bs
) {
2775 if (bdrv_dirty_bitmap_frozen(bitmap
)) {
2777 "Bitmap '%s' is currently frozen and cannot be modified",
2780 } else if (!bdrv_dirty_bitmap_enabled(bitmap
)) {
2782 "Bitmap '%s' is currently disabled and cannot be cleared",
2787 bdrv_clear_dirty_bitmap(bitmap
, NULL
);
2790 aio_context_release(aio_context
);
2793 void hmp_drive_del(Monitor
*mon
, const QDict
*qdict
)
2795 const char *id
= qdict_get_str(qdict
, "id");
2797 BlockDriverState
*bs
;
2798 AioContext
*aio_context
;
2799 Error
*local_err
= NULL
;
2801 bs
= bdrv_find_node(id
);
2803 qmp_x_blockdev_del(false, NULL
, true, id
, &local_err
);
2805 error_report_err(local_err
);
2810 blk
= blk_by_name(id
);
2812 error_report("Device '%s' not found", id
);
2816 if (!blk_legacy_dinfo(blk
)) {
2817 error_report("Deleting device added with blockdev-add"
2818 " is not supported");
2822 aio_context
= blk_get_aio_context(blk
);
2823 aio_context_acquire(aio_context
);
2827 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_DRIVE_DEL
, &local_err
)) {
2828 error_report_err(local_err
);
2829 aio_context_release(aio_context
);
2836 /* Make the BlockBackend and the attached BlockDriverState anonymous */
2837 monitor_remove_blk(blk
);
2839 /* If this BlockBackend has a device attached to it, its refcount will be
2840 * decremented when the device is removed; otherwise we have to do so here.
2842 if (blk_get_attached_dev(blk
)) {
2843 /* Further I/O must not pause the guest */
2844 blk_set_on_error(blk
, BLOCKDEV_ON_ERROR_REPORT
,
2845 BLOCKDEV_ON_ERROR_REPORT
);
2850 aio_context_release(aio_context
);
2853 void qmp_block_resize(bool has_device
, const char *device
,
2854 bool has_node_name
, const char *node_name
,
2855 int64_t size
, Error
**errp
)
2857 Error
*local_err
= NULL
;
2858 BlockDriverState
*bs
;
2859 AioContext
*aio_context
;
2862 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
2863 has_node_name
? node_name
: NULL
,
2866 error_propagate(errp
, local_err
);
2870 aio_context
= bdrv_get_aio_context(bs
);
2871 aio_context_acquire(aio_context
);
2873 if (!bdrv_is_first_non_filter(bs
)) {
2874 error_setg(errp
, QERR_FEATURE_DISABLED
, "resize");
2879 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "size", "a >0 size");
2883 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_RESIZE
, NULL
)) {
2884 error_setg(errp
, QERR_DEVICE_IN_USE
, device
);
2888 /* complete all in-flight operations before resizing the device */
2891 ret
= bdrv_truncate(bs
, size
);
2896 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
2899 error_setg(errp
, QERR_UNSUPPORTED
);
2902 error_setg(errp
, "Device '%s' is read only", device
);
2905 error_setg(errp
, QERR_DEVICE_IN_USE
, device
);
2908 error_setg_errno(errp
, -ret
, "Could not resize");
2913 aio_context_release(aio_context
);
2916 static void block_job_cb(void *opaque
, int ret
)
2918 /* Note that this function may be executed from another AioContext besides
2919 * the QEMU main loop. If you need to access anything that assumes the
2920 * QEMU global mutex, use a BH or introduce a mutex.
2923 BlockDriverState
*bs
= opaque
;
2924 const char *msg
= NULL
;
2926 trace_block_job_cb(bs
, bs
->job
, ret
);
2931 msg
= strerror(-ret
);
2934 if (block_job_is_cancelled(bs
->job
)) {
2935 block_job_event_cancelled(bs
->job
);
2937 block_job_event_completed(bs
->job
, msg
);
2941 void qmp_block_stream(bool has_job_id
, const char *job_id
, const char *device
,
2942 bool has_base
, const char *base
,
2943 bool has_backing_file
, const char *backing_file
,
2944 bool has_speed
, int64_t speed
,
2945 bool has_on_error
, BlockdevOnError on_error
,
2948 BlockDriverState
*bs
;
2949 BlockDriverState
*base_bs
= NULL
;
2950 AioContext
*aio_context
;
2951 Error
*local_err
= NULL
;
2952 const char *base_name
= NULL
;
2954 if (!has_on_error
) {
2955 on_error
= BLOCKDEV_ON_ERROR_REPORT
;
2958 bs
= qmp_get_root_bs(device
, errp
);
2963 aio_context
= bdrv_get_aio_context(bs
);
2964 aio_context_acquire(aio_context
);
2966 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_STREAM
, errp
)) {
2971 base_bs
= bdrv_find_backing_image(bs
, base
);
2972 if (base_bs
== NULL
) {
2973 error_setg(errp
, QERR_BASE_NOT_FOUND
, base
);
2976 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
2980 /* if we are streaming the entire chain, the result will have no backing
2981 * file, and specifying one is therefore an error */
2982 if (base_bs
== NULL
&& has_backing_file
) {
2983 error_setg(errp
, "backing file specified, but streaming the "
2988 /* backing_file string overrides base bs filename */
2989 base_name
= has_backing_file
? backing_file
: base_name
;
2991 stream_start(has_job_id
? job_id
: NULL
, bs
, base_bs
, base_name
,
2992 has_speed
? speed
: 0, on_error
, block_job_cb
, bs
, &local_err
);
2994 error_propagate(errp
, local_err
);
2998 trace_qmp_block_stream(bs
, bs
->job
);
3001 aio_context_release(aio_context
);
3004 void qmp_block_commit(bool has_job_id
, const char *job_id
, const char *device
,
3005 bool has_base
, const char *base
,
3006 bool has_top
, const char *top
,
3007 bool has_backing_file
, const char *backing_file
,
3008 bool has_speed
, int64_t speed
,
3011 BlockDriverState
*bs
;
3012 BlockDriverState
*base_bs
, *top_bs
;
3013 AioContext
*aio_context
;
3014 Error
*local_err
= NULL
;
3015 /* This will be part of the QMP command, if/when the
3016 * BlockdevOnError change for blkmirror makes it in
3018 BlockdevOnError on_error
= BLOCKDEV_ON_ERROR_REPORT
;
3025 * libvirt relies on the DeviceNotFound error class in order to probe for
3026 * live commit feature versions; for this to work, we must make sure to
3027 * perform the device lookup before any generic errors that may occur in a
3028 * scenario in which all optional arguments are omitted. */
3029 bs
= qmp_get_root_bs(device
, &local_err
);
3031 bs
= bdrv_lookup_bs(device
, device
, NULL
);
3033 error_free(local_err
);
3034 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
3035 "Device '%s' not found", device
);
3037 error_propagate(errp
, local_err
);
3042 aio_context
= bdrv_get_aio_context(bs
);
3043 aio_context_acquire(aio_context
);
3045 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_COMMIT_SOURCE
, errp
)) {
3049 /* default top_bs is the active layer */
3052 if (has_top
&& top
) {
3053 if (strcmp(bs
->filename
, top
) != 0) {
3054 top_bs
= bdrv_find_backing_image(bs
, top
);
3058 if (top_bs
== NULL
) {
3059 error_setg(errp
, "Top image file %s not found", top
? top
: "NULL");
3063 assert(bdrv_get_aio_context(top_bs
) == aio_context
);
3065 if (has_base
&& base
) {
3066 base_bs
= bdrv_find_backing_image(top_bs
, base
);
3068 base_bs
= bdrv_find_base(top_bs
);
3071 if (base_bs
== NULL
) {
3072 error_setg(errp
, QERR_BASE_NOT_FOUND
, base
? base
: "NULL");
3076 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
3078 if (bdrv_op_is_blocked(base_bs
, BLOCK_OP_TYPE_COMMIT_TARGET
, errp
)) {
3082 /* Do not allow attempts to commit an image into itself */
3083 if (top_bs
== base_bs
) {
3084 error_setg(errp
, "cannot commit an image into itself");
3089 if (has_backing_file
) {
3090 error_setg(errp
, "'backing-file' specified,"
3091 " but 'top' is the active layer");
3094 commit_active_start(has_job_id
? job_id
: NULL
, bs
, base_bs
, speed
,
3095 on_error
, block_job_cb
, bs
, &local_err
, false);
3097 commit_start(has_job_id
? job_id
: NULL
, bs
, base_bs
, top_bs
, speed
,
3098 on_error
, block_job_cb
, bs
,
3099 has_backing_file
? backing_file
: NULL
, &local_err
);
3101 if (local_err
!= NULL
) {
3102 error_propagate(errp
, local_err
);
3107 aio_context_release(aio_context
);
3110 static void do_drive_backup(DriveBackup
*backup
, BlockJobTxn
*txn
, Error
**errp
)
3112 BlockDriverState
*bs
;
3113 BlockDriverState
*target_bs
;
3114 BlockDriverState
*source
= NULL
;
3115 BdrvDirtyBitmap
*bmap
= NULL
;
3116 AioContext
*aio_context
;
3117 QDict
*options
= NULL
;
3118 Error
*local_err
= NULL
;
3122 if (!backup
->has_speed
) {
3125 if (!backup
->has_on_source_error
) {
3126 backup
->on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
3128 if (!backup
->has_on_target_error
) {
3129 backup
->on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
3131 if (!backup
->has_mode
) {
3132 backup
->mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
3134 if (!backup
->has_job_id
) {
3135 backup
->job_id
= NULL
;
3137 if (!backup
->has_compress
) {
3138 backup
->compress
= false;
3141 bs
= qmp_get_root_bs(backup
->device
, errp
);
3146 aio_context
= bdrv_get_aio_context(bs
);
3147 aio_context_acquire(aio_context
);
3149 if (!backup
->has_format
) {
3150 backup
->format
= backup
->mode
== NEW_IMAGE_MODE_EXISTING
?
3151 NULL
: (char*) bs
->drv
->format_name
;
3154 /* Early check to avoid creating target */
3155 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_BACKUP_SOURCE
, errp
)) {
3159 flags
= bs
->open_flags
| BDRV_O_RDWR
;
3161 /* See if we have a backing HD we can use to create our new image
3163 if (backup
->sync
== MIRROR_SYNC_MODE_TOP
) {
3164 source
= backing_bs(bs
);
3166 backup
->sync
= MIRROR_SYNC_MODE_FULL
;
3169 if (backup
->sync
== MIRROR_SYNC_MODE_NONE
) {
3173 size
= bdrv_getlength(bs
);
3175 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
3179 if (backup
->mode
!= NEW_IMAGE_MODE_EXISTING
) {
3180 assert(backup
->format
);
3182 bdrv_img_create(backup
->target
, backup
->format
, source
->filename
,
3183 source
->drv
->format_name
, NULL
,
3184 size
, flags
, &local_err
, false);
3186 bdrv_img_create(backup
->target
, backup
->format
, NULL
, NULL
, NULL
,
3187 size
, flags
, &local_err
, false);
3192 error_propagate(errp
, local_err
);
3196 if (backup
->format
) {
3197 options
= qdict_new();
3198 qdict_put(options
, "driver", qstring_from_str(backup
->format
));
3201 target_bs
= bdrv_open(backup
->target
, NULL
, options
, flags
, errp
);
3206 bdrv_set_aio_context(target_bs
, aio_context
);
3208 if (backup
->has_bitmap
) {
3209 bmap
= bdrv_find_dirty_bitmap(bs
, backup
->bitmap
);
3211 error_setg(errp
, "Bitmap '%s' could not be found", backup
->bitmap
);
3212 bdrv_unref(target_bs
);
3217 backup_start(backup
->job_id
, bs
, target_bs
, backup
->speed
, backup
->sync
,
3218 bmap
, backup
->compress
, backup
->on_source_error
,
3219 backup
->on_target_error
, block_job_cb
, bs
, txn
, &local_err
);
3220 bdrv_unref(target_bs
);
3221 if (local_err
!= NULL
) {
3222 error_propagate(errp
, local_err
);
3227 aio_context_release(aio_context
);
3230 void qmp_drive_backup(DriveBackup
*arg
, Error
**errp
)
3232 return do_drive_backup(arg
, NULL
, errp
);
3235 BlockDeviceInfoList
*qmp_query_named_block_nodes(Error
**errp
)
3237 return bdrv_named_nodes_list(errp
);
3240 void do_blockdev_backup(BlockdevBackup
*backup
, BlockJobTxn
*txn
, Error
**errp
)
3242 BlockDriverState
*bs
;
3243 BlockDriverState
*target_bs
;
3244 Error
*local_err
= NULL
;
3245 AioContext
*aio_context
;
3247 if (!backup
->has_speed
) {
3250 if (!backup
->has_on_source_error
) {
3251 backup
->on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
3253 if (!backup
->has_on_target_error
) {
3254 backup
->on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
3256 if (!backup
->has_job_id
) {
3257 backup
->job_id
= NULL
;
3259 if (!backup
->has_compress
) {
3260 backup
->compress
= false;
3263 bs
= qmp_get_root_bs(backup
->device
, errp
);
3268 aio_context
= bdrv_get_aio_context(bs
);
3269 aio_context_acquire(aio_context
);
3271 target_bs
= bdrv_lookup_bs(backup
->target
, backup
->target
, errp
);
3276 if (bdrv_get_aio_context(target_bs
) != aio_context
) {
3277 if (!bdrv_has_blk(target_bs
)) {
3278 /* The target BDS is not attached, we can safely move it to another
3280 bdrv_set_aio_context(target_bs
, aio_context
);
3282 error_setg(errp
, "Target is attached to a different thread from "
3287 backup_start(backup
->job_id
, bs
, target_bs
, backup
->speed
, backup
->sync
,
3288 NULL
, backup
->compress
, backup
->on_source_error
,
3289 backup
->on_target_error
, block_job_cb
, bs
, txn
, &local_err
);
3290 if (local_err
!= NULL
) {
3291 error_propagate(errp
, local_err
);
3294 aio_context_release(aio_context
);
3297 void qmp_blockdev_backup(BlockdevBackup
*arg
, Error
**errp
)
3299 do_blockdev_backup(arg
, NULL
, errp
);
3302 /* Parameter check and block job starting for drive mirroring.
3303 * Caller should hold @device and @target's aio context (must be the same).
3305 static void blockdev_mirror_common(const char *job_id
, BlockDriverState
*bs
,
3306 BlockDriverState
*target
,
3307 bool has_replaces
, const char *replaces
,
3308 enum MirrorSyncMode sync
,
3309 BlockMirrorBackingMode backing_mode
,
3310 bool has_speed
, int64_t speed
,
3311 bool has_granularity
, uint32_t granularity
,
3312 bool has_buf_size
, int64_t buf_size
,
3313 bool has_on_source_error
,
3314 BlockdevOnError on_source_error
,
3315 bool has_on_target_error
,
3316 BlockdevOnError on_target_error
,
3317 bool has_unmap
, bool unmap
,
3324 if (!has_on_source_error
) {
3325 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
3327 if (!has_on_target_error
) {
3328 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
3330 if (!has_granularity
) {
3333 if (!has_buf_size
) {
3340 if (granularity
!= 0 && (granularity
< 512 || granularity
> 1048576 * 64)) {
3341 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
3342 "a value in range [512B, 64MB]");
3345 if (granularity
& (granularity
- 1)) {
3346 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
3351 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_MIRROR_SOURCE
, errp
)) {
3354 if (bdrv_op_is_blocked(target
, BLOCK_OP_TYPE_MIRROR_TARGET
, errp
)) {
3358 if (!bs
->backing
&& sync
== MIRROR_SYNC_MODE_TOP
) {
3359 sync
= MIRROR_SYNC_MODE_FULL
;
3362 /* pass the node name to replace to mirror start since it's loose coupling
3363 * and will allow to check whether the node still exist at mirror completion
3365 mirror_start(job_id
, bs
, target
,
3366 has_replaces
? replaces
: NULL
,
3367 speed
, granularity
, buf_size
, sync
, backing_mode
,
3368 on_source_error
, on_target_error
, unmap
,
3369 block_job_cb
, bs
, errp
);
3372 void qmp_drive_mirror(DriveMirror
*arg
, Error
**errp
)
3374 BlockDriverState
*bs
;
3375 BlockDriverState
*source
, *target_bs
;
3376 AioContext
*aio_context
;
3377 BlockMirrorBackingMode backing_mode
;
3378 Error
*local_err
= NULL
;
3379 QDict
*options
= NULL
;
3382 const char *format
= arg
->format
;
3384 bs
= qmp_get_root_bs(arg
->device
, errp
);
3389 aio_context
= bdrv_get_aio_context(bs
);
3390 aio_context_acquire(aio_context
);
3392 if (!arg
->has_mode
) {
3393 arg
->mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
3396 if (!arg
->has_format
) {
3397 format
= (arg
->mode
== NEW_IMAGE_MODE_EXISTING
3398 ? NULL
: bs
->drv
->format_name
);
3401 flags
= bs
->open_flags
| BDRV_O_RDWR
;
3402 source
= backing_bs(bs
);
3403 if (!source
&& arg
->sync
== MIRROR_SYNC_MODE_TOP
) {
3404 arg
->sync
= MIRROR_SYNC_MODE_FULL
;
3406 if (arg
->sync
== MIRROR_SYNC_MODE_NONE
) {
3410 size
= bdrv_getlength(bs
);
3412 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
3416 if (arg
->has_replaces
) {
3417 BlockDriverState
*to_replace_bs
;
3418 AioContext
*replace_aio_context
;
3419 int64_t replace_size
;
3421 if (!arg
->has_node_name
) {
3422 error_setg(errp
, "a node-name must be provided when replacing a"
3423 " named node of the graph");
3427 to_replace_bs
= check_to_replace_node(bs
, arg
->replaces
, &local_err
);
3429 if (!to_replace_bs
) {
3430 error_propagate(errp
, local_err
);
3434 replace_aio_context
= bdrv_get_aio_context(to_replace_bs
);
3435 aio_context_acquire(replace_aio_context
);
3436 replace_size
= bdrv_getlength(to_replace_bs
);
3437 aio_context_release(replace_aio_context
);
3439 if (size
!= replace_size
) {
3440 error_setg(errp
, "cannot replace image with a mirror image of "
3446 if (arg
->mode
== NEW_IMAGE_MODE_ABSOLUTE_PATHS
) {
3447 backing_mode
= MIRROR_SOURCE_BACKING_CHAIN
;
3449 backing_mode
= MIRROR_OPEN_BACKING_CHAIN
;
3452 if ((arg
->sync
== MIRROR_SYNC_MODE_FULL
|| !source
)
3453 && arg
->mode
!= NEW_IMAGE_MODE_EXISTING
)
3455 /* create new image w/o backing file */
3457 bdrv_img_create(arg
->target
, format
,
3458 NULL
, NULL
, NULL
, size
, flags
, &local_err
, false);
3460 switch (arg
->mode
) {
3461 case NEW_IMAGE_MODE_EXISTING
:
3463 case NEW_IMAGE_MODE_ABSOLUTE_PATHS
:
3464 /* create new image with backing file */
3465 bdrv_img_create(arg
->target
, format
,
3467 source
->drv
->format_name
,
3468 NULL
, size
, flags
, &local_err
, false);
3476 error_propagate(errp
, local_err
);
3480 options
= qdict_new();
3481 if (arg
->has_node_name
) {
3482 qdict_put(options
, "node-name", qstring_from_str(arg
->node_name
));
3485 qdict_put(options
, "driver", qstring_from_str(format
));
3488 /* Mirroring takes care of copy-on-write using the source's backing
3491 target_bs
= bdrv_open(arg
->target
, NULL
, options
,
3492 flags
| BDRV_O_NO_BACKING
, errp
);
3497 bdrv_set_aio_context(target_bs
, aio_context
);
3499 blockdev_mirror_common(arg
->has_job_id
? arg
->job_id
: NULL
, bs
, target_bs
,
3500 arg
->has_replaces
, arg
->replaces
, arg
->sync
,
3501 backing_mode
, arg
->has_speed
, arg
->speed
,
3502 arg
->has_granularity
, arg
->granularity
,
3503 arg
->has_buf_size
, arg
->buf_size
,
3504 arg
->has_on_source_error
, arg
->on_source_error
,
3505 arg
->has_on_target_error
, arg
->on_target_error
,
3506 arg
->has_unmap
, arg
->unmap
,
3508 bdrv_unref(target_bs
);
3509 error_propagate(errp
, local_err
);
3511 aio_context_release(aio_context
);
3514 void qmp_blockdev_mirror(bool has_job_id
, const char *job_id
,
3515 const char *device
, const char *target
,
3516 bool has_replaces
, const char *replaces
,
3517 MirrorSyncMode sync
,
3518 bool has_speed
, int64_t speed
,
3519 bool has_granularity
, uint32_t granularity
,
3520 bool has_buf_size
, int64_t buf_size
,
3521 bool has_on_source_error
,
3522 BlockdevOnError on_source_error
,
3523 bool has_on_target_error
,
3524 BlockdevOnError on_target_error
,
3527 BlockDriverState
*bs
;
3528 BlockDriverState
*target_bs
;
3529 AioContext
*aio_context
;
3530 BlockMirrorBackingMode backing_mode
= MIRROR_LEAVE_BACKING_CHAIN
;
3531 Error
*local_err
= NULL
;
3533 bs
= qmp_get_root_bs(device
, errp
);
3538 target_bs
= bdrv_lookup_bs(target
, target
, errp
);
3543 aio_context
= bdrv_get_aio_context(bs
);
3544 aio_context_acquire(aio_context
);
3546 bdrv_set_aio_context(target_bs
, aio_context
);
3548 blockdev_mirror_common(has_job_id
? job_id
: NULL
, bs
, target_bs
,
3549 has_replaces
, replaces
, sync
, backing_mode
,
3551 has_granularity
, granularity
,
3552 has_buf_size
, buf_size
,
3553 has_on_source_error
, on_source_error
,
3554 has_on_target_error
, on_target_error
,
3557 error_propagate(errp
, local_err
);
3559 aio_context_release(aio_context
);
3562 /* Get a block job using its ID and acquire its AioContext */
3563 static BlockJob
*find_block_job(const char *id
, AioContext
**aio_context
,
3570 *aio_context
= NULL
;
3572 job
= block_job_get(id
);
3575 error_set(errp
, ERROR_CLASS_DEVICE_NOT_ACTIVE
,
3576 "Block job '%s' not found", id
);
3580 *aio_context
= blk_get_aio_context(job
->blk
);
3581 aio_context_acquire(*aio_context
);
3586 void qmp_block_job_set_speed(const char *device
, int64_t speed
, Error
**errp
)
3588 AioContext
*aio_context
;
3589 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3595 block_job_set_speed(job
, speed
, errp
);
3596 aio_context_release(aio_context
);
3599 void qmp_block_job_cancel(const char *device
,
3600 bool has_force
, bool force
, Error
**errp
)
3602 AioContext
*aio_context
;
3603 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3613 if (job
->user_paused
&& !force
) {
3614 error_setg(errp
, "The block job for device '%s' is currently paused",
3619 trace_qmp_block_job_cancel(job
);
3620 block_job_cancel(job
);
3622 aio_context_release(aio_context
);
3625 void qmp_block_job_pause(const char *device
, Error
**errp
)
3627 AioContext
*aio_context
;
3628 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3630 if (!job
|| job
->user_paused
) {
3634 job
->user_paused
= true;
3635 trace_qmp_block_job_pause(job
);
3636 block_job_pause(job
);
3637 aio_context_release(aio_context
);
3640 void qmp_block_job_resume(const char *device
, Error
**errp
)
3642 AioContext
*aio_context
;
3643 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3645 if (!job
|| !job
->user_paused
) {
3649 job
->user_paused
= false;
3650 trace_qmp_block_job_resume(job
);
3651 block_job_iostatus_reset(job
);
3652 block_job_resume(job
);
3653 aio_context_release(aio_context
);
3656 void qmp_block_job_complete(const char *device
, Error
**errp
)
3658 AioContext
*aio_context
;
3659 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3665 trace_qmp_block_job_complete(job
);
3666 block_job_complete(job
, errp
);
3667 aio_context_release(aio_context
);
3670 void qmp_change_backing_file(const char *device
,
3671 const char *image_node_name
,
3672 const char *backing_file
,
3675 BlockDriverState
*bs
= NULL
;
3676 AioContext
*aio_context
;
3677 BlockDriverState
*image_bs
= NULL
;
3678 Error
*local_err
= NULL
;
3683 bs
= qmp_get_root_bs(device
, errp
);
3688 aio_context
= bdrv_get_aio_context(bs
);
3689 aio_context_acquire(aio_context
);
3691 image_bs
= bdrv_lookup_bs(NULL
, image_node_name
, &local_err
);
3693 error_propagate(errp
, local_err
);
3698 error_setg(errp
, "image file not found");
3702 if (bdrv_find_base(image_bs
) == image_bs
) {
3703 error_setg(errp
, "not allowing backing file change on an image "
3704 "without a backing file");
3708 /* even though we are not necessarily operating on bs, we need it to
3709 * determine if block ops are currently prohibited on the chain */
3710 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_CHANGE
, errp
)) {
3714 /* final sanity check */
3715 if (!bdrv_chain_contains(bs
, image_bs
)) {
3716 error_setg(errp
, "'%s' and image file are not in the same chain",
3721 /* if not r/w, reopen to make r/w */
3722 open_flags
= image_bs
->open_flags
;
3723 ro
= bdrv_is_read_only(image_bs
);
3726 bdrv_reopen(image_bs
, open_flags
| BDRV_O_RDWR
, &local_err
);
3728 error_propagate(errp
, local_err
);
3733 ret
= bdrv_change_backing_file(image_bs
, backing_file
,
3734 image_bs
->drv
? image_bs
->drv
->format_name
: "");
3737 error_setg_errno(errp
, -ret
, "Could not change backing file to '%s'",
3739 /* don't exit here, so we can try to restore open flags if
3744 bdrv_reopen(image_bs
, open_flags
, &local_err
);
3745 error_propagate(errp
, local_err
);
3749 aio_context_release(aio_context
);
3752 void hmp_drive_add_node(Monitor
*mon
, const char *optstr
)
3756 Error
*local_err
= NULL
;
3758 opts
= qemu_opts_parse_noisily(&qemu_drive_opts
, optstr
, false);
3763 qdict
= qemu_opts_to_qdict(opts
, NULL
);
3765 if (!qdict_get_try_str(qdict
, "node-name")) {
3767 error_report("'node-name' needs to be specified");
3771 BlockDriverState
*bs
= bds_tree_init(qdict
, &local_err
);
3773 error_report_err(local_err
);
3777 QTAILQ_INSERT_TAIL(&monitor_bdrv_states
, bs
, monitor_list
);
3780 qemu_opts_del(opts
);
3783 void qmp_blockdev_add(BlockdevOptions
*options
, Error
**errp
)
3785 BlockDriverState
*bs
;
3786 BlockBackend
*blk
= NULL
;
3788 Visitor
*v
= qmp_output_visitor_new(&obj
);
3790 Error
*local_err
= NULL
;
3792 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3793 * cache.direct=false instead of silently switching to aio=threads, except
3794 * when called from drive_new().
3796 * For now, simply forbidding the combination for all drivers will do. */
3797 if (options
->has_aio
&& options
->aio
== BLOCKDEV_AIO_OPTIONS_NATIVE
) {
3798 bool direct
= options
->has_cache
&&
3799 options
->cache
->has_direct
&&
3800 options
->cache
->direct
;
3802 error_setg(errp
, "aio=native requires cache.direct=true");
3807 visit_type_BlockdevOptions(v
, NULL
, &options
, &local_err
);
3809 error_propagate(errp
, local_err
);
3813 visit_complete(v
, &obj
);
3814 qdict
= qobject_to_qdict(obj
);
3816 qdict_flatten(qdict
);
3818 if (options
->has_id
) {
3819 blk
= blockdev_init(NULL
, qdict
, &local_err
);
3821 error_propagate(errp
, local_err
);
3827 if (!qdict_get_try_str(qdict
, "node-name")) {
3828 error_setg(errp
, "'id' and/or 'node-name' need to be specified for "
3833 bs
= bds_tree_init(qdict
, errp
);
3838 QTAILQ_INSERT_TAIL(&monitor_bdrv_states
, bs
, monitor_list
);
3841 if (bs
&& bdrv_key_required(bs
)) {
3843 monitor_remove_blk(blk
);
3846 QTAILQ_REMOVE(&monitor_bdrv_states
, bs
, monitor_list
);
3849 error_setg(errp
, "blockdev-add doesn't support encrypted devices");
3857 void qmp_x_blockdev_del(bool has_id
, const char *id
,
3858 bool has_node_name
, const char *node_name
, Error
**errp
)
3860 AioContext
*aio_context
;
3862 BlockDriverState
*bs
;
3864 if (has_id
&& has_node_name
) {
3865 error_setg(errp
, "Only one of id and node-name must be specified");
3867 } else if (!has_id
&& !has_node_name
) {
3868 error_setg(errp
, "No block device specified");
3873 /* blk_by_name() never returns a BB that is not owned by the monitor */
3874 blk
= blk_by_name(id
);
3876 error_setg(errp
, "Cannot find block backend %s", id
);
3879 if (blk_legacy_dinfo(blk
)) {
3880 error_setg(errp
, "Deleting block backend added with drive-add"
3881 " is not supported");
3884 if (blk_get_refcnt(blk
) > 1) {
3885 error_setg(errp
, "Block backend %s is in use", id
);
3889 aio_context
= blk_get_aio_context(blk
);
3892 bs
= bdrv_find_node(node_name
);
3894 error_setg(errp
, "Cannot find node %s", node_name
);
3897 if (bdrv_has_blk(bs
)) {
3898 error_setg(errp
, "Node %s is in use by %s",
3899 node_name
, bdrv_get_parent_name(bs
));
3902 aio_context
= bdrv_get_aio_context(bs
);
3905 aio_context_acquire(aio_context
);
3908 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_DRIVE_DEL
, errp
)) {
3912 if (!blk
&& !QTAILQ_IN_USE(bs
, monitor_list
)) {
3913 error_setg(errp
, "Node %s is not owned by the monitor",
3918 if (bs
->refcnt
> 1) {
3919 error_setg(errp
, "Block device %s is in use",
3920 bdrv_get_device_or_node_name(bs
));
3926 monitor_remove_blk(blk
);
3929 QTAILQ_REMOVE(&monitor_bdrv_states
, bs
, monitor_list
);
3934 aio_context_release(aio_context
);
3937 static BdrvChild
*bdrv_find_child(BlockDriverState
*parent_bs
,
3938 const char *child_name
)
3942 QLIST_FOREACH(child
, &parent_bs
->children
, next
) {
3943 if (strcmp(child
->name
, child_name
) == 0) {
3951 void qmp_x_blockdev_change(const char *parent
, bool has_child
,
3952 const char *child
, bool has_node
,
3953 const char *node
, Error
**errp
)
3955 BlockDriverState
*parent_bs
, *new_bs
= NULL
;
3958 parent_bs
= bdrv_lookup_bs(parent
, parent
, errp
);
3963 if (has_child
== has_node
) {
3965 error_setg(errp
, "The parameters child and node are in conflict");
3967 error_setg(errp
, "Either child or node must be specified");
3973 p_child
= bdrv_find_child(parent_bs
, child
);
3975 error_setg(errp
, "Node '%s' does not have child '%s'",
3979 bdrv_del_child(parent_bs
, p_child
, errp
);
3983 new_bs
= bdrv_find_node(node
);
3985 error_setg(errp
, "Node '%s' not found", node
);
3988 bdrv_add_child(parent_bs
, new_bs
, errp
);
3992 BlockJobInfoList
*qmp_query_block_jobs(Error
**errp
)
3994 BlockJobInfoList
*head
= NULL
, **p_next
= &head
;
3997 for (job
= block_job_next(NULL
); job
; job
= block_job_next(job
)) {
3998 BlockJobInfoList
*elem
= g_new0(BlockJobInfoList
, 1);
3999 AioContext
*aio_context
= blk_get_aio_context(job
->blk
);
4001 aio_context_acquire(aio_context
);
4002 elem
->value
= block_job_query(job
);
4003 aio_context_release(aio_context
);
4006 p_next
= &elem
->next
;
4012 QemuOptsList qemu_common_drive_opts
= {
4014 .head
= QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts
.head
),
4018 .type
= QEMU_OPT_BOOL
,
4019 .help
= "enable/disable snapshot mode",
4022 .type
= QEMU_OPT_STRING
,
4023 .help
= "discard operation (ignore/off, unmap/on)",
4026 .type
= QEMU_OPT_STRING
,
4027 .help
= "host AIO implementation (threads, native)",
4029 .name
= BDRV_OPT_CACHE_WB
,
4030 .type
= QEMU_OPT_BOOL
,
4031 .help
= "Enable writeback mode",
4034 .type
= QEMU_OPT_STRING
,
4035 .help
= "disk format (raw, qcow2, ...)",
4038 .type
= QEMU_OPT_STRING
,
4039 .help
= "read error action",
4042 .type
= QEMU_OPT_STRING
,
4043 .help
= "write error action",
4045 .name
= BDRV_OPT_READ_ONLY
,
4046 .type
= QEMU_OPT_BOOL
,
4047 .help
= "open drive file as read-only",
4049 .name
= "throttling.iops-total",
4050 .type
= QEMU_OPT_NUMBER
,
4051 .help
= "limit total I/O operations per second",
4053 .name
= "throttling.iops-read",
4054 .type
= QEMU_OPT_NUMBER
,
4055 .help
= "limit read operations per second",
4057 .name
= "throttling.iops-write",
4058 .type
= QEMU_OPT_NUMBER
,
4059 .help
= "limit write operations per second",
4061 .name
= "throttling.bps-total",
4062 .type
= QEMU_OPT_NUMBER
,
4063 .help
= "limit total bytes per second",
4065 .name
= "throttling.bps-read",
4066 .type
= QEMU_OPT_NUMBER
,
4067 .help
= "limit read bytes per second",
4069 .name
= "throttling.bps-write",
4070 .type
= QEMU_OPT_NUMBER
,
4071 .help
= "limit write bytes per second",
4073 .name
= "throttling.iops-total-max",
4074 .type
= QEMU_OPT_NUMBER
,
4075 .help
= "I/O operations burst",
4077 .name
= "throttling.iops-read-max",
4078 .type
= QEMU_OPT_NUMBER
,
4079 .help
= "I/O operations read burst",
4081 .name
= "throttling.iops-write-max",
4082 .type
= QEMU_OPT_NUMBER
,
4083 .help
= "I/O operations write burst",
4085 .name
= "throttling.bps-total-max",
4086 .type
= QEMU_OPT_NUMBER
,
4087 .help
= "total bytes burst",
4089 .name
= "throttling.bps-read-max",
4090 .type
= QEMU_OPT_NUMBER
,
4091 .help
= "total bytes read burst",
4093 .name
= "throttling.bps-write-max",
4094 .type
= QEMU_OPT_NUMBER
,
4095 .help
= "total bytes write burst",
4097 .name
= "throttling.iops-total-max-length",
4098 .type
= QEMU_OPT_NUMBER
,
4099 .help
= "length of the iops-total-max burst period, in seconds",
4101 .name
= "throttling.iops-read-max-length",
4102 .type
= QEMU_OPT_NUMBER
,
4103 .help
= "length of the iops-read-max burst period, in seconds",
4105 .name
= "throttling.iops-write-max-length",
4106 .type
= QEMU_OPT_NUMBER
,
4107 .help
= "length of the iops-write-max burst period, in seconds",
4109 .name
= "throttling.bps-total-max-length",
4110 .type
= QEMU_OPT_NUMBER
,
4111 .help
= "length of the bps-total-max burst period, in seconds",
4113 .name
= "throttling.bps-read-max-length",
4114 .type
= QEMU_OPT_NUMBER
,
4115 .help
= "length of the bps-read-max burst period, in seconds",
4117 .name
= "throttling.bps-write-max-length",
4118 .type
= QEMU_OPT_NUMBER
,
4119 .help
= "length of the bps-write-max burst period, in seconds",
4121 .name
= "throttling.iops-size",
4122 .type
= QEMU_OPT_NUMBER
,
4123 .help
= "when limiting by iops max size of an I/O in bytes",
4125 .name
= "throttling.group",
4126 .type
= QEMU_OPT_STRING
,
4127 .help
= "name of the block throttling group",
4129 .name
= "copy-on-read",
4130 .type
= QEMU_OPT_BOOL
,
4131 .help
= "copy read data from backing file into image file",
4133 .name
= "detect-zeroes",
4134 .type
= QEMU_OPT_STRING
,
4135 .help
= "try to optimize zero writes (off, on, unmap)",
4137 .name
= "stats-account-invalid",
4138 .type
= QEMU_OPT_BOOL
,
4139 .help
= "whether to account for invalid I/O operations "
4140 "in the statistics",
4142 .name
= "stats-account-failed",
4143 .type
= QEMU_OPT_BOOL
,
4144 .help
= "whether to account for failed I/O operations "
4145 "in the statistics",
4147 { /* end of list */ }
4151 static QemuOptsList qemu_root_bds_opts
= {
4153 .head
= QTAILQ_HEAD_INITIALIZER(qemu_root_bds_opts
.head
),
4157 .type
= QEMU_OPT_STRING
,
4158 .help
= "discard operation (ignore/off, unmap/on)",
4161 .type
= QEMU_OPT_STRING
,
4162 .help
= "host AIO implementation (threads, native)",
4164 .name
= "copy-on-read",
4165 .type
= QEMU_OPT_BOOL
,
4166 .help
= "copy read data from backing file into image file",
4168 .name
= "detect-zeroes",
4169 .type
= QEMU_OPT_STRING
,
4170 .help
= "try to optimize zero writes (off, on, unmap)",
4172 { /* end of list */ }
4176 QemuOptsList qemu_drive_opts
= {
4178 .head
= QTAILQ_HEAD_INITIALIZER(qemu_drive_opts
.head
),
4181 * no elements => accept any params
4182 * validation will happen later
4184 { /* end of list */ }