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 *blk_name
, const char *qdev_id
,
60 bool force
, Error
**errp
);
62 static const char *const if_name
[IF_COUNT
] = {
66 [IF_FLOPPY
] = "floppy",
67 [IF_PFLASH
] = "pflash",
70 [IF_VIRTIO
] = "virtio",
74 static int if_max_devs
[IF_COUNT
] = {
76 * Do not change these numbers! They govern how drive option
77 * index maps to unit and bus. That mapping is ABI.
79 * All controllers used to implement if=T drives need to support
80 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
81 * Otherwise, some index values map to "impossible" bus, unit
84 * For instance, if you change [IF_SCSI] to 255, -drive
85 * if=scsi,index=12 no longer means bus=1,unit=5, but
86 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
87 * the drive can't be set up. Regression.
94 * Boards may call this to offer board-by-board overrides
95 * of the default, global values.
97 void override_max_devs(BlockInterfaceType type
, int max_devs
)
106 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
107 dinfo
= blk_legacy_dinfo(blk
);
108 if (dinfo
->type
== type
) {
109 fprintf(stderr
, "Cannot override units-per-bus property of"
110 " the %s interface, because a drive of that type has"
111 " already been added.\n", if_name
[type
]);
112 g_assert_not_reached();
116 if_max_devs
[type
] = max_devs
;
120 * We automatically delete the drive when a device using it gets
121 * unplugged. Questionable feature, but we can't just drop it.
122 * Device models call blockdev_mark_auto_del() to schedule the
123 * automatic deletion, and generic qdev code calls blockdev_auto_del()
124 * when deletion is actually safe.
126 void blockdev_mark_auto_del(BlockBackend
*blk
)
128 DriveInfo
*dinfo
= blk_legacy_dinfo(blk
);
129 BlockDriverState
*bs
= blk_bs(blk
);
130 AioContext
*aio_context
;
137 aio_context
= bdrv_get_aio_context(bs
);
138 aio_context_acquire(aio_context
);
141 block_job_cancel(bs
->job
);
144 aio_context_release(aio_context
);
150 void blockdev_auto_del(BlockBackend
*blk
)
152 DriveInfo
*dinfo
= blk_legacy_dinfo(blk
);
154 if (dinfo
&& dinfo
->auto_del
) {
155 monitor_remove_blk(blk
);
161 * Returns the current mapping of how many units per bus
162 * a particular interface can support.
164 * A positive integer indicates n units per bus.
165 * 0 implies the mapping has not been established.
166 * -1 indicates an invalid BlockInterfaceType was given.
168 int drive_get_max_devs(BlockInterfaceType type
)
170 if (type
>= IF_IDE
&& type
< IF_COUNT
) {
171 return if_max_devs
[type
];
177 static int drive_index_to_bus_id(BlockInterfaceType type
, int index
)
179 int max_devs
= if_max_devs
[type
];
180 return max_devs
? index
/ max_devs
: 0;
183 static int drive_index_to_unit_id(BlockInterfaceType type
, int index
)
185 int max_devs
= if_max_devs
[type
];
186 return max_devs
? index
% max_devs
: index
;
189 QemuOpts
*drive_def(const char *optstr
)
191 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr
, false);
194 QemuOpts
*drive_add(BlockInterfaceType type
, int index
, const char *file
,
199 opts
= drive_def(optstr
);
203 if (type
!= IF_DEFAULT
) {
204 qemu_opt_set(opts
, "if", if_name
[type
], &error_abort
);
207 qemu_opt_set_number(opts
, "index", index
, &error_abort
);
210 qemu_opt_set(opts
, "file", file
, &error_abort
);
214 DriveInfo
*drive_get(BlockInterfaceType type
, int bus
, int unit
)
219 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
220 dinfo
= blk_legacy_dinfo(blk
);
221 if (dinfo
&& dinfo
->type
== type
222 && dinfo
->bus
== bus
&& dinfo
->unit
== unit
) {
230 bool drive_check_orphaned(void)
236 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
237 dinfo
= blk_legacy_dinfo(blk
);
238 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
239 /* Unless this is a default drive, this may be an oversight. */
240 if (!blk_get_attached_dev(blk
) && !dinfo
->is_default
&&
241 dinfo
->type
!= IF_NONE
) {
242 fprintf(stderr
, "Warning: Orphaned drive without device: "
243 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
244 blk_name(blk
), blk_bs(blk
) ? blk_bs(blk
)->filename
: "",
245 if_name
[dinfo
->type
], dinfo
->bus
, dinfo
->unit
);
253 DriveInfo
*drive_get_by_index(BlockInterfaceType type
, int index
)
255 return drive_get(type
,
256 drive_index_to_bus_id(type
, index
),
257 drive_index_to_unit_id(type
, index
));
260 int drive_get_max_bus(BlockInterfaceType type
)
267 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
268 dinfo
= blk_legacy_dinfo(blk
);
269 if (dinfo
&& dinfo
->type
== type
&& dinfo
->bus
> max_bus
) {
270 max_bus
= dinfo
->bus
;
276 /* Get a block device. This should only be used for single-drive devices
277 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
279 DriveInfo
*drive_get_next(BlockInterfaceType type
)
281 static int next_block_unit
[IF_COUNT
];
283 return drive_get(type
, 0, next_block_unit
[type
]++);
286 static void bdrv_format_print(void *opaque
, const char *name
)
288 error_printf(" %s", name
);
293 BlockDriverState
*bs
;
296 static int parse_block_error_action(const char *buf
, bool is_read
, Error
**errp
)
298 if (!strcmp(buf
, "ignore")) {
299 return BLOCKDEV_ON_ERROR_IGNORE
;
300 } else if (!is_read
&& !strcmp(buf
, "enospc")) {
301 return BLOCKDEV_ON_ERROR_ENOSPC
;
302 } else if (!strcmp(buf
, "stop")) {
303 return BLOCKDEV_ON_ERROR_STOP
;
304 } else if (!strcmp(buf
, "report")) {
305 return BLOCKDEV_ON_ERROR_REPORT
;
307 error_setg(errp
, "'%s' invalid %s error action",
308 buf
, is_read
? "read" : "write");
313 static bool parse_stats_intervals(BlockAcctStats
*stats
, QList
*intervals
,
316 const QListEntry
*entry
;
317 for (entry
= qlist_first(intervals
); entry
; entry
= qlist_next(entry
)) {
318 switch (qobject_type(entry
->value
)) {
320 case QTYPE_QSTRING
: {
321 unsigned long long length
;
322 const char *str
= qstring_get_str(qobject_to_qstring(entry
->value
));
323 if (parse_uint_full(str
, &length
, 10) == 0 &&
324 length
> 0 && length
<= UINT_MAX
) {
325 block_acct_add_interval(stats
, (unsigned) length
);
327 error_setg(errp
, "Invalid interval length: %s", str
);
334 int64_t length
= qint_get_int(qobject_to_qint(entry
->value
));
335 if (length
> 0 && length
<= UINT_MAX
) {
336 block_acct_add_interval(stats
, (unsigned) length
);
338 error_setg(errp
, "Invalid interval length: %" PRId64
, length
);
345 error_setg(errp
, "The specification of stats-intervals is invalid");
352 typedef enum { MEDIA_DISK
, MEDIA_CDROM
} DriveMediaType
;
354 /* All parameters but @opts are optional and may be set to NULL. */
355 static void extract_common_blockdev_options(QemuOpts
*opts
, int *bdrv_flags
,
356 const char **throttling_group
, ThrottleConfig
*throttle_cfg
,
357 BlockdevDetectZeroesOptions
*detect_zeroes
, Error
**errp
)
360 Error
*local_error
= NULL
;
364 if (qemu_opt_get_bool(opts
, "copy-on-read", false)) {
365 *bdrv_flags
|= BDRV_O_COPY_ON_READ
;
368 if ((discard
= qemu_opt_get(opts
, "discard")) != NULL
) {
369 if (bdrv_parse_discard_flags(discard
, bdrv_flags
) != 0) {
370 error_setg(errp
, "Invalid discard option");
375 if ((aio
= qemu_opt_get(opts
, "aio")) != NULL
) {
376 if (!strcmp(aio
, "native")) {
377 *bdrv_flags
|= BDRV_O_NATIVE_AIO
;
378 } else if (!strcmp(aio
, "threads")) {
379 /* this is the default */
381 error_setg(errp
, "invalid aio option");
387 /* disk I/O throttling */
388 if (throttling_group
) {
389 *throttling_group
= qemu_opt_get(opts
, "throttling.group");
393 throttle_config_init(throttle_cfg
);
394 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].avg
=
395 qemu_opt_get_number(opts
, "throttling.bps-total", 0);
396 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].avg
=
397 qemu_opt_get_number(opts
, "throttling.bps-read", 0);
398 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].avg
=
399 qemu_opt_get_number(opts
, "throttling.bps-write", 0);
400 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].avg
=
401 qemu_opt_get_number(opts
, "throttling.iops-total", 0);
402 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].avg
=
403 qemu_opt_get_number(opts
, "throttling.iops-read", 0);
404 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].avg
=
405 qemu_opt_get_number(opts
, "throttling.iops-write", 0);
407 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].max
=
408 qemu_opt_get_number(opts
, "throttling.bps-total-max", 0);
409 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].max
=
410 qemu_opt_get_number(opts
, "throttling.bps-read-max", 0);
411 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].max
=
412 qemu_opt_get_number(opts
, "throttling.bps-write-max", 0);
413 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].max
=
414 qemu_opt_get_number(opts
, "throttling.iops-total-max", 0);
415 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].max
=
416 qemu_opt_get_number(opts
, "throttling.iops-read-max", 0);
417 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].max
=
418 qemu_opt_get_number(opts
, "throttling.iops-write-max", 0);
420 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].burst_length
=
421 qemu_opt_get_number(opts
, "throttling.bps-total-max-length", 1);
422 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].burst_length
=
423 qemu_opt_get_number(opts
, "throttling.bps-read-max-length", 1);
424 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].burst_length
=
425 qemu_opt_get_number(opts
, "throttling.bps-write-max-length", 1);
426 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].burst_length
=
427 qemu_opt_get_number(opts
, "throttling.iops-total-max-length", 1);
428 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].burst_length
=
429 qemu_opt_get_number(opts
, "throttling.iops-read-max-length", 1);
430 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].burst_length
=
431 qemu_opt_get_number(opts
, "throttling.iops-write-max-length", 1);
433 throttle_cfg
->op_size
=
434 qemu_opt_get_number(opts
, "throttling.iops-size", 0);
436 if (!throttle_is_valid(throttle_cfg
, errp
)) {
443 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup
,
444 qemu_opt_get(opts
, "detect-zeroes"),
445 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX
,
446 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
,
449 error_propagate(errp
, local_error
);
454 *detect_zeroes
== BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP
&&
455 !(*bdrv_flags
& BDRV_O_UNMAP
))
457 error_setg(errp
, "setting detect-zeroes to unmap is not allowed "
458 "without setting discard operation to unmap");
464 /* Takes the ownership of bs_opts */
465 static BlockBackend
*blockdev_init(const char *file
, QDict
*bs_opts
,
470 int on_read_error
, on_write_error
;
471 bool account_invalid
, account_failed
;
472 bool writethrough
, read_only
;
474 BlockDriverState
*bs
;
479 QDict
*interval_dict
= NULL
;
480 QList
*interval_list
= NULL
;
482 BlockdevDetectZeroesOptions detect_zeroes
=
483 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
;
484 const char *throttling_group
= NULL
;
486 /* Check common options by copying from bs_opts to opts, all other options
487 * stay in bs_opts for processing by bdrv_open(). */
488 id
= qdict_get_try_str(bs_opts
, "id");
489 opts
= qemu_opts_create(&qemu_common_drive_opts
, id
, 1, &error
);
491 error_propagate(errp
, error
);
495 qemu_opts_absorb_qdict(opts
, bs_opts
, &error
);
497 error_propagate(errp
, error
);
502 qdict_del(bs_opts
, "id");
505 /* extract parameters */
506 snapshot
= qemu_opt_get_bool(opts
, "snapshot", 0);
508 account_invalid
= qemu_opt_get_bool(opts
, "stats-account-invalid", true);
509 account_failed
= qemu_opt_get_bool(opts
, "stats-account-failed", true);
511 writethrough
= !qemu_opt_get_bool(opts
, BDRV_OPT_CACHE_WB
, true);
513 id
= qemu_opts_id(opts
);
515 qdict_extract_subqdict(bs_opts
, &interval_dict
, "stats-intervals.");
516 qdict_array_split(interval_dict
, &interval_list
);
518 if (qdict_size(interval_dict
) != 0) {
519 error_setg(errp
, "Invalid option stats-intervals.%s",
520 qdict_first(interval_dict
)->key
);
524 extract_common_blockdev_options(opts
, &bdrv_flags
, &throttling_group
, &cfg
,
525 &detect_zeroes
, &error
);
527 error_propagate(errp
, error
);
531 if ((buf
= qemu_opt_get(opts
, "format")) != NULL
) {
532 if (is_help_option(buf
)) {
533 error_printf("Supported formats:");
534 bdrv_iterate_format(bdrv_format_print
, NULL
);
539 if (qdict_haskey(bs_opts
, "driver")) {
540 error_setg(errp
, "Cannot specify both 'driver' and 'format'");
543 qdict_put(bs_opts
, "driver", qstring_from_str(buf
));
546 on_write_error
= BLOCKDEV_ON_ERROR_ENOSPC
;
547 if ((buf
= qemu_opt_get(opts
, "werror")) != NULL
) {
548 on_write_error
= parse_block_error_action(buf
, 0, &error
);
550 error_propagate(errp
, error
);
555 on_read_error
= BLOCKDEV_ON_ERROR_REPORT
;
556 if ((buf
= qemu_opt_get(opts
, "rerror")) != NULL
) {
557 on_read_error
= parse_block_error_action(buf
, 1, &error
);
559 error_propagate(errp
, error
);
565 bdrv_flags
|= BDRV_O_SNAPSHOT
;
568 read_only
= qemu_opt_get_bool(opts
, BDRV_OPT_READ_ONLY
, false);
571 if ((!file
|| !*file
) && !qdict_size(bs_opts
)) {
572 BlockBackendRootState
*blk_rs
;
575 blk_rs
= blk_get_root_state(blk
);
576 blk_rs
->open_flags
= bdrv_flags
;
577 blk_rs
->read_only
= read_only
;
578 blk_rs
->detect_zeroes
= detect_zeroes
;
582 if (file
&& !*file
) {
586 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
587 * with other callers) rather than what we want as the real defaults.
588 * Apply the defaults here instead. */
589 qdict_set_default_str(bs_opts
, BDRV_OPT_CACHE_DIRECT
, "off");
590 qdict_set_default_str(bs_opts
, BDRV_OPT_CACHE_NO_FLUSH
, "off");
591 qdict_set_default_str(bs_opts
, BDRV_OPT_READ_ONLY
,
592 read_only
? "on" : "off");
593 assert((bdrv_flags
& BDRV_O_CACHE_MASK
) == 0);
595 if (runstate_check(RUN_STATE_INMIGRATE
)) {
596 bdrv_flags
|= BDRV_O_INACTIVE
;
599 blk
= blk_new_open(file
, NULL
, bs_opts
, bdrv_flags
, errp
);
605 bs
->detect_zeroes
= detect_zeroes
;
607 if (bdrv_key_required(bs
)) {
611 block_acct_init(blk_get_stats(blk
), account_invalid
, account_failed
);
613 if (!parse_stats_intervals(blk_get_stats(blk
), interval_list
, errp
)) {
620 /* disk I/O throttling */
621 if (throttle_enabled(&cfg
)) {
622 if (!throttling_group
) {
623 throttling_group
= id
;
625 blk_io_limits_enable(blk
, throttling_group
);
626 blk_set_io_limits(blk
, &cfg
);
629 blk_set_enable_write_cache(blk
, !writethrough
);
630 blk_set_on_error(blk
, on_read_error
, on_write_error
);
632 if (!monitor_add_blk(blk
, id
, errp
)) {
640 QDECREF(interval_dict
);
641 QDECREF(interval_list
);
646 QDECREF(interval_dict
);
647 QDECREF(interval_list
);
653 static QemuOptsList qemu_root_bds_opts
;
655 /* Takes the ownership of bs_opts */
656 static BlockDriverState
*bds_tree_init(QDict
*bs_opts
, Error
**errp
)
658 BlockDriverState
*bs
;
660 Error
*local_error
= NULL
;
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
,
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
;
707 void blockdev_close_all_bdrv_states(void)
709 BlockDriverState
*bs
, *next_bs
;
711 QTAILQ_FOREACH_SAFE(bs
, &monitor_bdrv_states
, monitor_list
, next_bs
) {
712 AioContext
*ctx
= bdrv_get_aio_context(bs
);
714 aio_context_acquire(ctx
);
716 aio_context_release(ctx
);
720 /* Iterates over the list of monitor-owned BlockDriverStates */
721 BlockDriverState
*bdrv_next_monitor_owned(BlockDriverState
*bs
)
723 return bs
? QTAILQ_NEXT(bs
, monitor_list
)
724 : QTAILQ_FIRST(&monitor_bdrv_states
);
727 static void qemu_opt_rename(QemuOpts
*opts
, const char *from
, const char *to
,
732 value
= qemu_opt_get(opts
, from
);
734 if (qemu_opt_find(opts
, to
)) {
735 error_setg(errp
, "'%s' and its alias '%s' can't be used at the "
736 "same time", to
, from
);
741 /* rename all items in opts */
742 while ((value
= qemu_opt_get(opts
, from
))) {
743 qemu_opt_set(opts
, to
, value
, &error_abort
);
744 qemu_opt_unset(opts
, from
);
748 QemuOptsList qemu_legacy_drive_opts
= {
750 .head
= QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts
.head
),
754 .type
= QEMU_OPT_NUMBER
,
755 .help
= "bus number",
758 .type
= QEMU_OPT_NUMBER
,
759 .help
= "unit number (i.e. lun for scsi)",
762 .type
= QEMU_OPT_NUMBER
,
763 .help
= "index number",
766 .type
= QEMU_OPT_STRING
,
767 .help
= "media type (disk, cdrom)",
770 .type
= QEMU_OPT_STRING
,
771 .help
= "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
774 .type
= QEMU_OPT_NUMBER
,
775 .help
= "number of cylinders (ide disk geometry)",
778 .type
= QEMU_OPT_NUMBER
,
779 .help
= "number of heads (ide disk geometry)",
782 .type
= QEMU_OPT_NUMBER
,
783 .help
= "number of sectors (ide disk geometry)",
786 .type
= QEMU_OPT_STRING
,
787 .help
= "chs translation (auto, lba, none)",
790 .type
= QEMU_OPT_BOOL
,
791 .help
= "(deprecated, ignored)",
794 .type
= QEMU_OPT_STRING
,
795 .help
= "pci address (virtio only)",
798 .type
= QEMU_OPT_STRING
,
799 .help
= "disk serial number",
802 .type
= QEMU_OPT_STRING
,
806 /* Options that are passed on, but have special semantics with -drive */
808 .name
= BDRV_OPT_READ_ONLY
,
809 .type
= QEMU_OPT_BOOL
,
810 .help
= "open drive file as read-only",
813 .type
= QEMU_OPT_STRING
,
814 .help
= "read error action",
817 .type
= QEMU_OPT_STRING
,
818 .help
= "write error action",
820 .name
= "copy-on-read",
821 .type
= QEMU_OPT_BOOL
,
822 .help
= "copy read data from backing file into image file",
825 { /* end of list */ }
829 DriveInfo
*drive_new(QemuOpts
*all_opts
, BlockInterfaceType block_default_type
)
833 DriveInfo
*dinfo
= NULL
;
835 QemuOpts
*legacy_opts
;
836 DriveMediaType media
= MEDIA_DISK
;
837 BlockInterfaceType type
;
838 int cyls
, heads
, secs
, translation
;
839 int max_devs
, bus_id
, unit_id
, index
;
841 const char *werror
, *rerror
;
842 bool read_only
= false;
845 const char *filename
;
846 Error
*local_err
= NULL
;
849 /* Change legacy command line options into QMP ones */
850 static const struct {
854 { "iops", "throttling.iops-total" },
855 { "iops_rd", "throttling.iops-read" },
856 { "iops_wr", "throttling.iops-write" },
858 { "bps", "throttling.bps-total" },
859 { "bps_rd", "throttling.bps-read" },
860 { "bps_wr", "throttling.bps-write" },
862 { "iops_max", "throttling.iops-total-max" },
863 { "iops_rd_max", "throttling.iops-read-max" },
864 { "iops_wr_max", "throttling.iops-write-max" },
866 { "bps_max", "throttling.bps-total-max" },
867 { "bps_rd_max", "throttling.bps-read-max" },
868 { "bps_wr_max", "throttling.bps-write-max" },
870 { "iops_size", "throttling.iops-size" },
872 { "group", "throttling.group" },
874 { "readonly", BDRV_OPT_READ_ONLY
},
877 for (i
= 0; i
< ARRAY_SIZE(opt_renames
); i
++) {
878 qemu_opt_rename(all_opts
, opt_renames
[i
].from
, opt_renames
[i
].to
,
881 error_report_err(local_err
);
886 value
= qemu_opt_get(all_opts
, "cache");
891 if (bdrv_parse_cache_mode(value
, &flags
, &writethrough
) != 0) {
892 error_report("invalid cache option");
896 /* Specific options take precedence */
897 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_WB
)) {
898 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_WB
,
899 !writethrough
, &error_abort
);
901 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_DIRECT
)) {
902 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_DIRECT
,
903 !!(flags
& BDRV_O_NOCACHE
), &error_abort
);
905 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_NO_FLUSH
)) {
906 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_NO_FLUSH
,
907 !!(flags
& BDRV_O_NO_FLUSH
), &error_abort
);
909 qemu_opt_unset(all_opts
, "cache");
912 /* Get a QDict for processing the options */
913 bs_opts
= qdict_new();
914 qemu_opts_to_qdict(all_opts
, bs_opts
);
916 legacy_opts
= qemu_opts_create(&qemu_legacy_drive_opts
, NULL
, 0,
918 qemu_opts_absorb_qdict(legacy_opts
, bs_opts
, &local_err
);
920 error_report_err(local_err
);
924 /* Deprecated option boot=[on|off] */
925 if (qemu_opt_get(legacy_opts
, "boot") != NULL
) {
926 fprintf(stderr
, "qemu-kvm: boot=on|off is deprecated and will be "
927 "ignored. Future versions will reject this parameter. Please "
928 "update your scripts.\n");
932 value
= qemu_opt_get(legacy_opts
, "media");
934 if (!strcmp(value
, "disk")) {
936 } else if (!strcmp(value
, "cdrom")) {
940 error_report("'%s' invalid media", value
);
945 /* copy-on-read is disabled with a warning for read-only devices */
946 read_only
|= qemu_opt_get_bool(legacy_opts
, BDRV_OPT_READ_ONLY
, false);
947 copy_on_read
= qemu_opt_get_bool(legacy_opts
, "copy-on-read", false);
949 if (read_only
&& copy_on_read
) {
950 error_report("warning: disabling copy-on-read on read-only drive");
951 copy_on_read
= false;
954 qdict_put(bs_opts
, BDRV_OPT_READ_ONLY
,
955 qstring_from_str(read_only
? "on" : "off"));
956 qdict_put(bs_opts
, "copy-on-read",
957 qstring_from_str(copy_on_read
? "on" :"off"));
959 /* Controller type */
960 value
= qemu_opt_get(legacy_opts
, "if");
963 type
< IF_COUNT
&& strcmp(value
, if_name
[type
]);
966 if (type
== IF_COUNT
) {
967 error_report("unsupported bus type '%s'", value
);
971 type
= block_default_type
;
975 cyls
= qemu_opt_get_number(legacy_opts
, "cyls", 0);
976 heads
= qemu_opt_get_number(legacy_opts
, "heads", 0);
977 secs
= qemu_opt_get_number(legacy_opts
, "secs", 0);
979 if (cyls
|| heads
|| secs
) {
981 error_report("invalid physical cyls number");
985 error_report("invalid physical heads number");
989 error_report("invalid physical secs number");
994 translation
= BIOS_ATA_TRANSLATION_AUTO
;
995 value
= qemu_opt_get(legacy_opts
, "trans");
998 error_report("'%s' trans must be used with cyls, heads and secs",
1002 if (!strcmp(value
, "none")) {
1003 translation
= BIOS_ATA_TRANSLATION_NONE
;
1004 } else if (!strcmp(value
, "lba")) {
1005 translation
= BIOS_ATA_TRANSLATION_LBA
;
1006 } else if (!strcmp(value
, "large")) {
1007 translation
= BIOS_ATA_TRANSLATION_LARGE
;
1008 } else if (!strcmp(value
, "rechs")) {
1009 translation
= BIOS_ATA_TRANSLATION_RECHS
;
1010 } else if (!strcmp(value
, "auto")) {
1011 translation
= BIOS_ATA_TRANSLATION_AUTO
;
1013 error_report("'%s' invalid translation type", value
);
1018 if (media
== MEDIA_CDROM
) {
1019 if (cyls
|| secs
|| heads
) {
1020 error_report("CHS can't be set with media=cdrom");
1025 /* Device address specified by bus/unit or index.
1026 * If none was specified, try to find the first free one. */
1027 bus_id
= qemu_opt_get_number(legacy_opts
, "bus", 0);
1028 unit_id
= qemu_opt_get_number(legacy_opts
, "unit", -1);
1029 index
= qemu_opt_get_number(legacy_opts
, "index", -1);
1031 max_devs
= if_max_devs
[type
];
1034 if (bus_id
!= 0 || unit_id
!= -1) {
1035 error_report("index cannot be used with bus and unit");
1038 bus_id
= drive_index_to_bus_id(type
, index
);
1039 unit_id
= drive_index_to_unit_id(type
, index
);
1042 if (unit_id
== -1) {
1044 while (drive_get(type
, bus_id
, unit_id
) != NULL
) {
1046 if (max_devs
&& unit_id
>= max_devs
) {
1047 unit_id
-= max_devs
;
1053 if (max_devs
&& unit_id
>= max_devs
) {
1054 error_report("unit %d too big (max is %d)", unit_id
, max_devs
- 1);
1058 if (drive_get(type
, bus_id
, unit_id
) != NULL
) {
1059 error_report("drive with bus=%d, unit=%d (index=%d) exists",
1060 bus_id
, unit_id
, index
);
1065 serial
= qemu_opt_get(legacy_opts
, "serial");
1067 /* no id supplied -> create one */
1068 if (qemu_opts_id(all_opts
) == NULL
) {
1070 const char *mediastr
= "";
1071 if (type
== IF_IDE
|| type
== IF_SCSI
) {
1072 mediastr
= (media
== MEDIA_CDROM
) ? "-cd" : "-hd";
1075 new_id
= g_strdup_printf("%s%i%s%i", if_name
[type
], bus_id
,
1078 new_id
= g_strdup_printf("%s%s%i", if_name
[type
],
1081 qdict_put(bs_opts
, "id", qstring_from_str(new_id
));
1085 /* Add virtio block device */
1086 devaddr
= qemu_opt_get(legacy_opts
, "addr");
1087 if (devaddr
&& type
!= IF_VIRTIO
) {
1088 error_report("addr is not supported by this bus type");
1092 if (type
== IF_VIRTIO
) {
1094 devopts
= qemu_opts_create(qemu_find_opts("device"), NULL
, 0,
1096 if (arch_type
== QEMU_ARCH_S390X
) {
1097 qemu_opt_set(devopts
, "driver", "virtio-blk-ccw", &error_abort
);
1099 qemu_opt_set(devopts
, "driver", "virtio-blk-pci", &error_abort
);
1101 qemu_opt_set(devopts
, "drive", qdict_get_str(bs_opts
, "id"),
1104 qemu_opt_set(devopts
, "addr", devaddr
, &error_abort
);
1108 filename
= qemu_opt_get(legacy_opts
, "file");
1110 /* Check werror/rerror compatibility with if=... */
1111 werror
= qemu_opt_get(legacy_opts
, "werror");
1112 if (werror
!= NULL
) {
1113 if (type
!= IF_IDE
&& type
!= IF_SCSI
&& type
!= IF_VIRTIO
&&
1115 error_report("werror is not supported by this bus type");
1118 qdict_put(bs_opts
, "werror", qstring_from_str(werror
));
1121 rerror
= qemu_opt_get(legacy_opts
, "rerror");
1122 if (rerror
!= NULL
) {
1123 if (type
!= IF_IDE
&& type
!= IF_VIRTIO
&& type
!= IF_SCSI
&&
1125 error_report("rerror is not supported by this bus type");
1128 qdict_put(bs_opts
, "rerror", qstring_from_str(rerror
));
1131 /* Actual block device init: Functionality shared with blockdev-add */
1132 blk
= blockdev_init(filename
, bs_opts
, &local_err
);
1136 error_report_err(local_err
);
1143 /* Create legacy DriveInfo */
1144 dinfo
= g_malloc0(sizeof(*dinfo
));
1145 dinfo
->opts
= all_opts
;
1148 dinfo
->heads
= heads
;
1150 dinfo
->trans
= translation
;
1153 dinfo
->bus
= bus_id
;
1154 dinfo
->unit
= unit_id
;
1155 dinfo
->devaddr
= devaddr
;
1156 dinfo
->serial
= g_strdup(serial
);
1158 blk_set_legacy_dinfo(blk
, dinfo
);
1165 dinfo
->media_cd
= media
== MEDIA_CDROM
;
1172 qemu_opts_del(legacy_opts
);
1177 static BlockDriverState
*qmp_get_root_bs(const char *name
, Error
**errp
)
1179 BlockDriverState
*bs
;
1181 bs
= bdrv_lookup_bs(name
, name
, errp
);
1186 if (!bdrv_is_root_node(bs
)) {
1187 error_setg(errp
, "Need a root block node");
1191 if (!bdrv_is_inserted(bs
)) {
1192 error_setg(errp
, "Device has no medium");
1199 static BlockBackend
*qmp_get_blk(const char *blk_name
, const char *qdev_id
,
1204 if (!blk_name
== !qdev_id
) {
1205 error_setg(errp
, "Need exactly one of 'device' and 'id'");
1210 blk
= blk_by_qdev_id(qdev_id
, errp
);
1212 blk
= blk_by_name(blk_name
);
1214 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1215 "Device '%s' not found", blk_name
);
1222 void hmp_commit(Monitor
*mon
, const QDict
*qdict
)
1224 const char *device
= qdict_get_str(qdict
, "device");
1228 if (!strcmp(device
, "all")) {
1229 ret
= blk_commit_all();
1231 BlockDriverState
*bs
;
1232 AioContext
*aio_context
;
1234 blk
= blk_by_name(device
);
1236 monitor_printf(mon
, "Device '%s' not found\n", device
);
1239 if (!blk_is_available(blk
)) {
1240 monitor_printf(mon
, "Device '%s' has no medium\n", device
);
1245 aio_context
= bdrv_get_aio_context(bs
);
1246 aio_context_acquire(aio_context
);
1248 ret
= bdrv_commit(bs
);
1250 aio_context_release(aio_context
);
1253 monitor_printf(mon
, "'commit' error for '%s': %s\n", device
,
1258 static void blockdev_do_action(TransactionAction
*action
, Error
**errp
)
1260 TransactionActionList list
;
1262 list
.value
= action
;
1264 qmp_transaction(&list
, false, NULL
, errp
);
1267 void qmp_blockdev_snapshot_sync(bool has_device
, const char *device
,
1268 bool has_node_name
, const char *node_name
,
1269 const char *snapshot_file
,
1270 bool has_snapshot_node_name
,
1271 const char *snapshot_node_name
,
1272 bool has_format
, const char *format
,
1273 bool has_mode
, NewImageMode mode
, Error
**errp
)
1275 BlockdevSnapshotSync snapshot
= {
1276 .has_device
= has_device
,
1277 .device
= (char *) device
,
1278 .has_node_name
= has_node_name
,
1279 .node_name
= (char *) node_name
,
1280 .snapshot_file
= (char *) snapshot_file
,
1281 .has_snapshot_node_name
= has_snapshot_node_name
,
1282 .snapshot_node_name
= (char *) snapshot_node_name
,
1283 .has_format
= has_format
,
1284 .format
= (char *) format
,
1285 .has_mode
= has_mode
,
1288 TransactionAction action
= {
1289 .type
= TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
,
1290 .u
.blockdev_snapshot_sync
.data
= &snapshot
,
1292 blockdev_do_action(&action
, errp
);
1295 void qmp_blockdev_snapshot(const char *node
, const char *overlay
,
1298 BlockdevSnapshot snapshot_data
= {
1299 .node
= (char *) node
,
1300 .overlay
= (char *) overlay
1302 TransactionAction action
= {
1303 .type
= TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT
,
1304 .u
.blockdev_snapshot
.data
= &snapshot_data
,
1306 blockdev_do_action(&action
, errp
);
1309 void qmp_blockdev_snapshot_internal_sync(const char *device
,
1313 BlockdevSnapshotInternal snapshot
= {
1314 .device
= (char *) device
,
1315 .name
= (char *) name
1317 TransactionAction action
= {
1318 .type
= TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
,
1319 .u
.blockdev_snapshot_internal_sync
.data
= &snapshot
,
1321 blockdev_do_action(&action
, errp
);
1324 SnapshotInfo
*qmp_blockdev_snapshot_delete_internal_sync(const char *device
,
1331 BlockDriverState
*bs
;
1332 AioContext
*aio_context
;
1333 QEMUSnapshotInfo sn
;
1334 Error
*local_err
= NULL
;
1335 SnapshotInfo
*info
= NULL
;
1338 bs
= qmp_get_root_bs(device
, errp
);
1342 aio_context
= bdrv_get_aio_context(bs
);
1343 aio_context_acquire(aio_context
);
1354 error_setg(errp
, "Name or id must be provided");
1355 goto out_aio_context
;
1358 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE
, errp
)) {
1359 goto out_aio_context
;
1362 ret
= bdrv_snapshot_find_by_id_and_name(bs
, id
, name
, &sn
, &local_err
);
1364 error_propagate(errp
, local_err
);
1365 goto out_aio_context
;
1369 "Snapshot with id '%s' and name '%s' does not exist on "
1371 STR_OR_NULL(id
), STR_OR_NULL(name
), device
);
1372 goto out_aio_context
;
1375 bdrv_snapshot_delete(bs
, id
, name
, &local_err
);
1377 error_propagate(errp
, local_err
);
1378 goto out_aio_context
;
1381 aio_context_release(aio_context
);
1383 info
= g_new0(SnapshotInfo
, 1);
1384 info
->id
= g_strdup(sn
.id_str
);
1385 info
->name
= g_strdup(sn
.name
);
1386 info
->date_nsec
= sn
.date_nsec
;
1387 info
->date_sec
= sn
.date_sec
;
1388 info
->vm_state_size
= sn
.vm_state_size
;
1389 info
->vm_clock_nsec
= sn
.vm_clock_nsec
% 1000000000;
1390 info
->vm_clock_sec
= sn
.vm_clock_nsec
/ 1000000000;
1395 aio_context_release(aio_context
);
1400 * block_dirty_bitmap_lookup:
1401 * Return a dirty bitmap (if present), after validating
1402 * the node reference and bitmap names.
1404 * @node: The name of the BDS node to search for bitmaps
1405 * @name: The name of the bitmap to search for
1406 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1407 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1408 * @errp: Output pointer for error information. Can be NULL.
1410 * @return: A bitmap object on success, or NULL on failure.
1412 static BdrvDirtyBitmap
*block_dirty_bitmap_lookup(const char *node
,
1414 BlockDriverState
**pbs
,
1418 BlockDriverState
*bs
;
1419 BdrvDirtyBitmap
*bitmap
;
1420 AioContext
*aio_context
;
1423 error_setg(errp
, "Node cannot be NULL");
1427 error_setg(errp
, "Bitmap name cannot be NULL");
1430 bs
= bdrv_lookup_bs(node
, node
, NULL
);
1432 error_setg(errp
, "Node '%s' not found", node
);
1436 aio_context
= bdrv_get_aio_context(bs
);
1437 aio_context_acquire(aio_context
);
1439 bitmap
= bdrv_find_dirty_bitmap(bs
, name
);
1441 error_setg(errp
, "Dirty bitmap '%s' not found", name
);
1449 *paio
= aio_context
;
1451 aio_context_release(aio_context
);
1457 aio_context_release(aio_context
);
1461 /* New and old BlockDriverState structs for atomic group operations */
1463 typedef struct BlkActionState BlkActionState
;
1467 * Table of operations that define an Action.
1469 * @instance_size: Size of state struct, in bytes.
1470 * @prepare: Prepare the work, must NOT be NULL.
1471 * @commit: Commit the changes, can be NULL.
1472 * @abort: Abort the changes on fail, can be NULL.
1473 * @clean: Clean up resources after all transaction actions have called
1474 * commit() or abort(). Can be NULL.
1476 * Only prepare() may fail. In a single transaction, only one of commit() or
1477 * abort() will be called. clean() will always be called if it is present.
1479 typedef struct BlkActionOps
{
1480 size_t instance_size
;
1481 void (*prepare
)(BlkActionState
*common
, Error
**errp
);
1482 void (*commit
)(BlkActionState
*common
);
1483 void (*abort
)(BlkActionState
*common
);
1484 void (*clean
)(BlkActionState
*common
);
1489 * Describes one Action's state within a Transaction.
1491 * @action: QAPI-defined enum identifying which Action to perform.
1492 * @ops: Table of ActionOps this Action can perform.
1493 * @block_job_txn: Transaction which this action belongs to.
1494 * @entry: List membership for all Actions in this Transaction.
1496 * This structure must be arranged as first member in a subclassed type,
1497 * assuming that the compiler will also arrange it to the same offsets as the
1500 struct BlkActionState
{
1501 TransactionAction
*action
;
1502 const BlkActionOps
*ops
;
1503 BlockJobTxn
*block_job_txn
;
1504 TransactionProperties
*txn_props
;
1505 QSIMPLEQ_ENTRY(BlkActionState
) entry
;
1508 /* internal snapshot private data */
1509 typedef struct InternalSnapshotState
{
1510 BlkActionState common
;
1511 BlockDriverState
*bs
;
1512 AioContext
*aio_context
;
1513 QEMUSnapshotInfo sn
;
1515 } InternalSnapshotState
;
1518 static int action_check_completion_mode(BlkActionState
*s
, Error
**errp
)
1520 if (s
->txn_props
->completion_mode
!= ACTION_COMPLETION_MODE_INDIVIDUAL
) {
1522 "Action '%s' does not support Transaction property "
1523 "completion-mode = %s",
1524 TransactionActionKind_lookup
[s
->action
->type
],
1525 ActionCompletionMode_lookup
[s
->txn_props
->completion_mode
]);
1531 static void internal_snapshot_prepare(BlkActionState
*common
,
1534 Error
*local_err
= NULL
;
1537 BlockDriverState
*bs
;
1538 QEMUSnapshotInfo old_sn
, *sn
;
1541 BlockdevSnapshotInternal
*internal
;
1542 InternalSnapshotState
*state
;
1545 g_assert(common
->action
->type
==
1546 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
);
1547 internal
= common
->action
->u
.blockdev_snapshot_internal_sync
.data
;
1548 state
= DO_UPCAST(InternalSnapshotState
, common
, common
);
1550 /* 1. parse input */
1551 device
= internal
->device
;
1552 name
= internal
->name
;
1554 /* 2. check for validation */
1555 if (action_check_completion_mode(common
, errp
) < 0) {
1559 bs
= qmp_get_root_bs(device
, errp
);
1564 /* AioContext is released in .clean() */
1565 state
->aio_context
= bdrv_get_aio_context(bs
);
1566 aio_context_acquire(state
->aio_context
);
1569 bdrv_drained_begin(bs
);
1571 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT
, errp
)) {
1575 if (bdrv_is_read_only(bs
)) {
1576 error_setg(errp
, "Device '%s' is read only", device
);
1580 if (!bdrv_can_snapshot(bs
)) {
1581 error_setg(errp
, "Block format '%s' used by device '%s' "
1582 "does not support internal snapshots",
1583 bs
->drv
->format_name
, device
);
1587 if (!strlen(name
)) {
1588 error_setg(errp
, "Name is empty");
1592 /* check whether a snapshot with name exist */
1593 ret
= bdrv_snapshot_find_by_id_and_name(bs
, NULL
, name
, &old_sn
,
1596 error_propagate(errp
, local_err
);
1600 "Snapshot with name '%s' already exists on device '%s'",
1605 /* 3. take the snapshot */
1607 pstrcpy(sn
->name
, sizeof(sn
->name
), name
);
1608 qemu_gettimeofday(&tv
);
1609 sn
->date_sec
= tv
.tv_sec
;
1610 sn
->date_nsec
= tv
.tv_usec
* 1000;
1611 sn
->vm_clock_nsec
= qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
);
1613 ret1
= bdrv_snapshot_create(bs
, sn
);
1615 error_setg_errno(errp
, -ret1
,
1616 "Failed to create snapshot '%s' on device '%s'",
1621 /* 4. succeed, mark a snapshot is created */
1622 state
->created
= true;
1625 static void internal_snapshot_abort(BlkActionState
*common
)
1627 InternalSnapshotState
*state
=
1628 DO_UPCAST(InternalSnapshotState
, common
, common
);
1629 BlockDriverState
*bs
= state
->bs
;
1630 QEMUSnapshotInfo
*sn
= &state
->sn
;
1631 Error
*local_error
= NULL
;
1633 if (!state
->created
) {
1637 if (bdrv_snapshot_delete(bs
, sn
->id_str
, sn
->name
, &local_error
) < 0) {
1638 error_reportf_err(local_error
,
1639 "Failed to delete snapshot with id '%s' and "
1640 "name '%s' on device '%s' in abort: ",
1641 sn
->id_str
, sn
->name
,
1642 bdrv_get_device_name(bs
));
1646 static void internal_snapshot_clean(BlkActionState
*common
)
1648 InternalSnapshotState
*state
= DO_UPCAST(InternalSnapshotState
,
1651 if (state
->aio_context
) {
1653 bdrv_drained_end(state
->bs
);
1655 aio_context_release(state
->aio_context
);
1659 /* external snapshot private data */
1660 typedef struct ExternalSnapshotState
{
1661 BlkActionState common
;
1662 BlockDriverState
*old_bs
;
1663 BlockDriverState
*new_bs
;
1664 AioContext
*aio_context
;
1665 } ExternalSnapshotState
;
1667 static void external_snapshot_prepare(BlkActionState
*common
,
1671 QDict
*options
= NULL
;
1672 Error
*local_err
= NULL
;
1673 /* Device and node name of the image to generate the snapshot from */
1675 const char *node_name
;
1676 /* Reference to the new image (for 'blockdev-snapshot') */
1677 const char *snapshot_ref
;
1678 /* File name of the new image (for 'blockdev-snapshot-sync') */
1679 const char *new_image_file
;
1680 ExternalSnapshotState
*state
=
1681 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1682 TransactionAction
*action
= common
->action
;
1684 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1685 * purpose but a different set of parameters */
1686 switch (action
->type
) {
1687 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT
:
1689 BlockdevSnapshot
*s
= action
->u
.blockdev_snapshot
.data
;
1691 node_name
= s
->node
;
1692 new_image_file
= NULL
;
1693 snapshot_ref
= s
->overlay
;
1696 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
:
1698 BlockdevSnapshotSync
*s
= action
->u
.blockdev_snapshot_sync
.data
;
1699 device
= s
->has_device
? s
->device
: NULL
;
1700 node_name
= s
->has_node_name
? s
->node_name
: NULL
;
1701 new_image_file
= s
->snapshot_file
;
1702 snapshot_ref
= NULL
;
1706 g_assert_not_reached();
1709 /* start processing */
1710 if (action_check_completion_mode(common
, errp
) < 0) {
1714 state
->old_bs
= bdrv_lookup_bs(device
, node_name
, errp
);
1715 if (!state
->old_bs
) {
1719 /* Acquire AioContext now so any threads operating on old_bs stop */
1720 state
->aio_context
= bdrv_get_aio_context(state
->old_bs
);
1721 aio_context_acquire(state
->aio_context
);
1722 bdrv_drained_begin(state
->old_bs
);
1724 if (!bdrv_is_inserted(state
->old_bs
)) {
1725 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1729 if (bdrv_op_is_blocked(state
->old_bs
,
1730 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
, errp
)) {
1734 if (!bdrv_is_read_only(state
->old_bs
)) {
1735 if (bdrv_flush(state
->old_bs
)) {
1736 error_setg(errp
, QERR_IO_ERROR
);
1741 if (!bdrv_is_first_non_filter(state
->old_bs
)) {
1742 error_setg(errp
, QERR_FEATURE_DISABLED
, "snapshot");
1746 if (action
->type
== TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
) {
1747 BlockdevSnapshotSync
*s
= action
->u
.blockdev_snapshot_sync
.data
;
1748 const char *format
= s
->has_format
? s
->format
: "qcow2";
1749 enum NewImageMode mode
;
1750 const char *snapshot_node_name
=
1751 s
->has_snapshot_node_name
? s
->snapshot_node_name
: NULL
;
1753 if (node_name
&& !snapshot_node_name
) {
1754 error_setg(errp
, "New snapshot node name missing");
1758 if (snapshot_node_name
&&
1759 bdrv_lookup_bs(snapshot_node_name
, snapshot_node_name
, NULL
)) {
1760 error_setg(errp
, "New snapshot node name already in use");
1764 flags
= state
->old_bs
->open_flags
;
1765 flags
&= ~(BDRV_O_SNAPSHOT
| BDRV_O_NO_BACKING
| BDRV_O_COPY_ON_READ
);
1767 /* create new image w/backing file */
1768 mode
= s
->has_mode
? s
->mode
: NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
1769 if (mode
!= NEW_IMAGE_MODE_EXISTING
) {
1770 int64_t size
= bdrv_getlength(state
->old_bs
);
1772 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
1775 bdrv_img_create(new_image_file
, format
,
1776 state
->old_bs
->filename
,
1777 state
->old_bs
->drv
->format_name
,
1778 NULL
, size
, flags
, &local_err
, false);
1780 error_propagate(errp
, local_err
);
1785 options
= qdict_new();
1786 if (s
->has_snapshot_node_name
) {
1787 qdict_put(options
, "node-name",
1788 qstring_from_str(snapshot_node_name
));
1790 qdict_put(options
, "driver", qstring_from_str(format
));
1792 flags
|= BDRV_O_NO_BACKING
;
1795 state
->new_bs
= bdrv_open(new_image_file
, snapshot_ref
, options
, flags
,
1797 /* We will manually add the backing_hd field to the bs later */
1798 if (!state
->new_bs
) {
1802 if (bdrv_has_blk(state
->new_bs
)) {
1803 error_setg(errp
, "The snapshot is already in use");
1807 if (bdrv_op_is_blocked(state
->new_bs
, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
,
1812 if (state
->new_bs
->backing
!= NULL
) {
1813 error_setg(errp
, "The snapshot already has a backing image");
1817 if (!state
->new_bs
->drv
->supports_backing
) {
1818 error_setg(errp
, "The snapshot does not support backing images");
1822 static void external_snapshot_commit(BlkActionState
*common
)
1824 ExternalSnapshotState
*state
=
1825 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1827 bdrv_set_aio_context(state
->new_bs
, state
->aio_context
);
1829 /* This removes our old bs and adds the new bs */
1830 bdrv_append(state
->new_bs
, state
->old_bs
);
1831 /* We don't need (or want) to use the transactional
1832 * bdrv_reopen_multiple() across all the entries at once, because we
1833 * don't want to abort all of them if one of them fails the reopen */
1834 if (!state
->old_bs
->copy_on_read
) {
1835 bdrv_reopen(state
->old_bs
, state
->old_bs
->open_flags
& ~BDRV_O_RDWR
,
1840 static void external_snapshot_abort(BlkActionState
*common
)
1842 ExternalSnapshotState
*state
=
1843 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1844 if (state
->new_bs
) {
1845 bdrv_unref(state
->new_bs
);
1849 static void external_snapshot_clean(BlkActionState
*common
)
1851 ExternalSnapshotState
*state
=
1852 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1853 if (state
->aio_context
) {
1854 bdrv_drained_end(state
->old_bs
);
1855 aio_context_release(state
->aio_context
);
1859 typedef struct DriveBackupState
{
1860 BlkActionState common
;
1861 BlockDriverState
*bs
;
1862 AioContext
*aio_context
;
1866 static void do_drive_backup(DriveBackup
*backup
, BlockJobTxn
*txn
,
1869 static void drive_backup_prepare(BlkActionState
*common
, Error
**errp
)
1871 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1872 BlockDriverState
*bs
;
1873 DriveBackup
*backup
;
1874 Error
*local_err
= NULL
;
1876 assert(common
->action
->type
== TRANSACTION_ACTION_KIND_DRIVE_BACKUP
);
1877 backup
= common
->action
->u
.drive_backup
.data
;
1879 bs
= qmp_get_root_bs(backup
->device
, errp
);
1884 /* AioContext is released in .clean() */
1885 state
->aio_context
= bdrv_get_aio_context(bs
);
1886 aio_context_acquire(state
->aio_context
);
1887 bdrv_drained_begin(bs
);
1890 do_drive_backup(backup
, common
->block_job_txn
, &local_err
);
1892 error_propagate(errp
, local_err
);
1896 state
->job
= state
->bs
->job
;
1899 static void drive_backup_abort(BlkActionState
*common
)
1901 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1902 BlockDriverState
*bs
= state
->bs
;
1904 /* Only cancel if it's the job we started */
1905 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
1906 block_job_cancel_sync(bs
->job
);
1910 static void drive_backup_clean(BlkActionState
*common
)
1912 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1914 if (state
->aio_context
) {
1915 bdrv_drained_end(state
->bs
);
1916 aio_context_release(state
->aio_context
);
1920 typedef struct BlockdevBackupState
{
1921 BlkActionState common
;
1922 BlockDriverState
*bs
;
1924 AioContext
*aio_context
;
1925 } BlockdevBackupState
;
1927 static void do_blockdev_backup(BlockdevBackup
*backup
, BlockJobTxn
*txn
,
1930 static void blockdev_backup_prepare(BlkActionState
*common
, Error
**errp
)
1932 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1933 BlockdevBackup
*backup
;
1934 BlockDriverState
*bs
, *target
;
1935 Error
*local_err
= NULL
;
1937 assert(common
->action
->type
== TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP
);
1938 backup
= common
->action
->u
.blockdev_backup
.data
;
1940 bs
= qmp_get_root_bs(backup
->device
, errp
);
1945 target
= bdrv_lookup_bs(backup
->target
, backup
->target
, errp
);
1950 /* AioContext is released in .clean() */
1951 state
->aio_context
= bdrv_get_aio_context(bs
);
1952 if (state
->aio_context
!= bdrv_get_aio_context(target
)) {
1953 state
->aio_context
= NULL
;
1954 error_setg(errp
, "Backup between two IO threads is not implemented");
1957 aio_context_acquire(state
->aio_context
);
1959 bdrv_drained_begin(state
->bs
);
1961 do_blockdev_backup(backup
, common
->block_job_txn
, &local_err
);
1963 error_propagate(errp
, local_err
);
1967 state
->job
= state
->bs
->job
;
1970 static void blockdev_backup_abort(BlkActionState
*common
)
1972 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1973 BlockDriverState
*bs
= state
->bs
;
1975 /* Only cancel if it's the job we started */
1976 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
1977 block_job_cancel_sync(bs
->job
);
1981 static void blockdev_backup_clean(BlkActionState
*common
)
1983 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1985 if (state
->aio_context
) {
1986 bdrv_drained_end(state
->bs
);
1987 aio_context_release(state
->aio_context
);
1991 typedef struct BlockDirtyBitmapState
{
1992 BlkActionState common
;
1993 BdrvDirtyBitmap
*bitmap
;
1994 BlockDriverState
*bs
;
1995 AioContext
*aio_context
;
1998 } BlockDirtyBitmapState
;
2000 static void block_dirty_bitmap_add_prepare(BlkActionState
*common
,
2003 Error
*local_err
= NULL
;
2004 BlockDirtyBitmapAdd
*action
;
2005 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2008 if (action_check_completion_mode(common
, errp
) < 0) {
2012 action
= common
->action
->u
.block_dirty_bitmap_add
.data
;
2013 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
2014 qmp_block_dirty_bitmap_add(action
->node
, action
->name
,
2015 action
->has_granularity
, action
->granularity
,
2019 state
->prepared
= true;
2021 error_propagate(errp
, local_err
);
2025 static void block_dirty_bitmap_add_abort(BlkActionState
*common
)
2027 BlockDirtyBitmapAdd
*action
;
2028 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2031 action
= common
->action
->u
.block_dirty_bitmap_add
.data
;
2032 /* Should not be able to fail: IF the bitmap was added via .prepare(),
2033 * then the node reference and bitmap name must have been valid.
2035 if (state
->prepared
) {
2036 qmp_block_dirty_bitmap_remove(action
->node
, action
->name
, &error_abort
);
2040 static void block_dirty_bitmap_clear_prepare(BlkActionState
*common
,
2043 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2045 BlockDirtyBitmap
*action
;
2047 if (action_check_completion_mode(common
, errp
) < 0) {
2051 action
= common
->action
->u
.block_dirty_bitmap_clear
.data
;
2052 state
->bitmap
= block_dirty_bitmap_lookup(action
->node
,
2055 &state
->aio_context
,
2057 if (!state
->bitmap
) {
2061 if (bdrv_dirty_bitmap_frozen(state
->bitmap
)) {
2062 error_setg(errp
, "Cannot modify a frozen bitmap");
2064 } else if (!bdrv_dirty_bitmap_enabled(state
->bitmap
)) {
2065 error_setg(errp
, "Cannot clear a disabled bitmap");
2069 bdrv_clear_dirty_bitmap(state
->bitmap
, &state
->backup
);
2070 /* AioContext is released in .clean() */
2073 static void block_dirty_bitmap_clear_abort(BlkActionState
*common
)
2075 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2078 bdrv_undo_clear_dirty_bitmap(state
->bitmap
, state
->backup
);
2081 static void block_dirty_bitmap_clear_commit(BlkActionState
*common
)
2083 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2086 hbitmap_free(state
->backup
);
2089 static void block_dirty_bitmap_clear_clean(BlkActionState
*common
)
2091 BlockDirtyBitmapState
*state
= DO_UPCAST(BlockDirtyBitmapState
,
2094 if (state
->aio_context
) {
2095 aio_context_release(state
->aio_context
);
2099 static void abort_prepare(BlkActionState
*common
, Error
**errp
)
2101 error_setg(errp
, "Transaction aborted using Abort action");
2104 static void abort_commit(BlkActionState
*common
)
2106 g_assert_not_reached(); /* this action never succeeds */
2109 static const BlkActionOps actions
[] = {
2110 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT
] = {
2111 .instance_size
= sizeof(ExternalSnapshotState
),
2112 .prepare
= external_snapshot_prepare
,
2113 .commit
= external_snapshot_commit
,
2114 .abort
= external_snapshot_abort
,
2115 .clean
= external_snapshot_clean
,
2117 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
] = {
2118 .instance_size
= sizeof(ExternalSnapshotState
),
2119 .prepare
= external_snapshot_prepare
,
2120 .commit
= external_snapshot_commit
,
2121 .abort
= external_snapshot_abort
,
2122 .clean
= external_snapshot_clean
,
2124 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP
] = {
2125 .instance_size
= sizeof(DriveBackupState
),
2126 .prepare
= drive_backup_prepare
,
2127 .abort
= drive_backup_abort
,
2128 .clean
= drive_backup_clean
,
2130 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP
] = {
2131 .instance_size
= sizeof(BlockdevBackupState
),
2132 .prepare
= blockdev_backup_prepare
,
2133 .abort
= blockdev_backup_abort
,
2134 .clean
= blockdev_backup_clean
,
2136 [TRANSACTION_ACTION_KIND_ABORT
] = {
2137 .instance_size
= sizeof(BlkActionState
),
2138 .prepare
= abort_prepare
,
2139 .commit
= abort_commit
,
2141 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
] = {
2142 .instance_size
= sizeof(InternalSnapshotState
),
2143 .prepare
= internal_snapshot_prepare
,
2144 .abort
= internal_snapshot_abort
,
2145 .clean
= internal_snapshot_clean
,
2147 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD
] = {
2148 .instance_size
= sizeof(BlockDirtyBitmapState
),
2149 .prepare
= block_dirty_bitmap_add_prepare
,
2150 .abort
= block_dirty_bitmap_add_abort
,
2152 [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR
] = {
2153 .instance_size
= sizeof(BlockDirtyBitmapState
),
2154 .prepare
= block_dirty_bitmap_clear_prepare
,
2155 .commit
= block_dirty_bitmap_clear_commit
,
2156 .abort
= block_dirty_bitmap_clear_abort
,
2157 .clean
= block_dirty_bitmap_clear_clean
,
2162 * Allocate a TransactionProperties structure if necessary, and fill
2163 * that structure with desired defaults if they are unset.
2165 static TransactionProperties
*get_transaction_properties(
2166 TransactionProperties
*props
)
2169 props
= g_new0(TransactionProperties
, 1);
2172 if (!props
->has_completion_mode
) {
2173 props
->has_completion_mode
= true;
2174 props
->completion_mode
= ACTION_COMPLETION_MODE_INDIVIDUAL
;
2181 * 'Atomic' group operations. The operations are performed as a set, and if
2182 * any fail then we roll back all operations in the group.
2184 void qmp_transaction(TransactionActionList
*dev_list
,
2186 struct TransactionProperties
*props
,
2189 TransactionActionList
*dev_entry
= dev_list
;
2190 BlockJobTxn
*block_job_txn
= NULL
;
2191 BlkActionState
*state
, *next
;
2192 Error
*local_err
= NULL
;
2194 QSIMPLEQ_HEAD(snap_bdrv_states
, BlkActionState
) snap_bdrv_states
;
2195 QSIMPLEQ_INIT(&snap_bdrv_states
);
2197 /* Does this transaction get canceled as a group on failure?
2198 * If not, we don't really need to make a BlockJobTxn.
2200 props
= get_transaction_properties(props
);
2201 if (props
->completion_mode
!= ACTION_COMPLETION_MODE_INDIVIDUAL
) {
2202 block_job_txn
= block_job_txn_new();
2205 /* drain all i/o before any operations */
2208 /* We don't do anything in this loop that commits us to the operations */
2209 while (NULL
!= dev_entry
) {
2210 TransactionAction
*dev_info
= NULL
;
2211 const BlkActionOps
*ops
;
2213 dev_info
= dev_entry
->value
;
2214 dev_entry
= dev_entry
->next
;
2216 assert(dev_info
->type
< ARRAY_SIZE(actions
));
2218 ops
= &actions
[dev_info
->type
];
2219 assert(ops
->instance_size
> 0);
2221 state
= g_malloc0(ops
->instance_size
);
2223 state
->action
= dev_info
;
2224 state
->block_job_txn
= block_job_txn
;
2225 state
->txn_props
= props
;
2226 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states
, state
, entry
);
2228 state
->ops
->prepare(state
, &local_err
);
2230 error_propagate(errp
, local_err
);
2231 goto delete_and_fail
;
2235 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
2236 if (state
->ops
->commit
) {
2237 state
->ops
->commit(state
);
2245 /* failure, and it is all-or-none; roll back all operations */
2246 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
2247 if (state
->ops
->abort
) {
2248 state
->ops
->abort(state
);
2252 QSIMPLEQ_FOREACH_SAFE(state
, &snap_bdrv_states
, entry
, next
) {
2253 if (state
->ops
->clean
) {
2254 state
->ops
->clean(state
);
2259 qapi_free_TransactionProperties(props
);
2261 block_job_txn_unref(block_job_txn
);
2264 void qmp_eject(bool has_device
, const char *device
,
2265 bool has_id
, const char *id
,
2266 bool has_force
, bool force
, Error
**errp
)
2268 Error
*local_err
= NULL
;
2275 rc
= do_open_tray(has_device
? device
: NULL
,
2278 if (rc
&& rc
!= -ENOSYS
) {
2279 error_propagate(errp
, local_err
);
2282 error_free(local_err
);
2284 qmp_x_blockdev_remove_medium(has_device
, device
, has_id
, id
, errp
);
2287 void qmp_block_passwd(bool has_device
, const char *device
,
2288 bool has_node_name
, const char *node_name
,
2289 const char *password
, Error
**errp
)
2291 Error
*local_err
= NULL
;
2292 BlockDriverState
*bs
;
2293 AioContext
*aio_context
;
2295 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
2296 has_node_name
? node_name
: NULL
,
2299 error_propagate(errp
, local_err
);
2303 aio_context
= bdrv_get_aio_context(bs
);
2304 aio_context_acquire(aio_context
);
2306 bdrv_add_key(bs
, password
, errp
);
2308 aio_context_release(aio_context
);
2312 * Attempt to open the tray of @device.
2313 * If @force, ignore its tray lock.
2314 * Else, if the tray is locked, don't open it, but ask the guest to open it.
2315 * On error, store an error through @errp and return -errno.
2316 * If @device does not exist, return -ENODEV.
2317 * If it has no removable media, return -ENOTSUP.
2318 * If it has no tray, return -ENOSYS.
2319 * If the guest was asked to open the tray, return -EINPROGRESS.
2322 static int do_open_tray(const char *blk_name
, const char *qdev_id
,
2323 bool force
, Error
**errp
)
2326 const char *device
= qdev_id
?: blk_name
;
2329 blk
= qmp_get_blk(blk_name
, qdev_id
, errp
);
2334 if (!blk_dev_has_removable_media(blk
)) {
2335 error_setg(errp
, "Device '%s' is not removable", device
);
2339 if (!blk_dev_has_tray(blk
)) {
2340 error_setg(errp
, "Device '%s' does not have a tray", device
);
2344 if (blk_dev_is_tray_open(blk
)) {
2348 locked
= blk_dev_is_medium_locked(blk
);
2350 blk_dev_eject_request(blk
, force
);
2353 if (!locked
|| force
) {
2354 blk_dev_change_media_cb(blk
, false);
2357 if (locked
&& !force
) {
2358 error_setg(errp
, "Device '%s' is locked and force was not specified, "
2359 "wait for tray to open and try again", device
);
2360 return -EINPROGRESS
;
2366 void qmp_blockdev_open_tray(bool has_device
, const char *device
,
2367 bool has_id
, const char *id
,
2368 bool has_force
, bool force
,
2371 Error
*local_err
= NULL
;
2377 rc
= do_open_tray(has_device
? device
: NULL
,
2380 if (rc
&& rc
!= -ENOSYS
&& rc
!= -EINPROGRESS
) {
2381 error_propagate(errp
, local_err
);
2384 error_free(local_err
);
2387 void qmp_blockdev_close_tray(bool has_device
, const char *device
,
2388 bool has_id
, const char *id
,
2393 device
= has_device
? device
: NULL
;
2394 id
= has_id
? id
: NULL
;
2396 blk
= qmp_get_blk(device
, id
, errp
);
2401 if (!blk_dev_has_removable_media(blk
)) {
2402 error_setg(errp
, "Device '%s' is not removable", device
?: id
);
2406 if (!blk_dev_has_tray(blk
)) {
2407 /* Ignore this command on tray-less devices */
2411 if (!blk_dev_is_tray_open(blk
)) {
2415 blk_dev_change_media_cb(blk
, true);
2418 void qmp_x_blockdev_remove_medium(bool has_device
, const char *device
,
2419 bool has_id
, const char *id
, Error
**errp
)
2422 BlockDriverState
*bs
;
2423 AioContext
*aio_context
;
2424 bool has_attached_device
;
2426 device
= has_device
? device
: NULL
;
2427 id
= has_id
? id
: NULL
;
2429 blk
= qmp_get_blk(device
, id
, errp
);
2434 /* For BBs without a device, we can exchange the BDS tree at will */
2435 has_attached_device
= blk_get_attached_dev(blk
);
2437 if (has_attached_device
&& !blk_dev_has_removable_media(blk
)) {
2438 error_setg(errp
, "Device '%s' is not removable", device
?: id
);
2442 if (has_attached_device
&& blk_dev_has_tray(blk
) &&
2443 !blk_dev_is_tray_open(blk
))
2445 error_setg(errp
, "Tray of device '%s' is not open", device
?: id
);
2454 aio_context
= bdrv_get_aio_context(bs
);
2455 aio_context_acquire(aio_context
);
2457 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_EJECT
, errp
)) {
2463 if (!blk_dev_has_tray(blk
)) {
2464 /* For tray-less devices, blockdev-open-tray is a no-op (or may not be
2465 * called at all); therefore, the medium needs to be ejected here.
2466 * Do it after blk_remove_bs() so blk_is_inserted(blk) returns the @load
2467 * value passed here (i.e. false). */
2468 blk_dev_change_media_cb(blk
, false);
2472 aio_context_release(aio_context
);
2475 static void qmp_blockdev_insert_anon_medium(BlockBackend
*blk
,
2476 BlockDriverState
*bs
, Error
**errp
)
2480 /* For BBs without a device, we can exchange the BDS tree at will */
2481 has_device
= blk_get_attached_dev(blk
);
2483 if (has_device
&& !blk_dev_has_removable_media(blk
)) {
2484 error_setg(errp
, "Device is not removable");
2488 if (has_device
&& blk_dev_has_tray(blk
) && !blk_dev_is_tray_open(blk
)) {
2489 error_setg(errp
, "Tray of the device is not open");
2494 error_setg(errp
, "There already is a medium in the device");
2498 blk_insert_bs(blk
, bs
);
2500 if (!blk_dev_has_tray(blk
)) {
2501 /* For tray-less devices, blockdev-close-tray is a no-op (or may not be
2502 * called at all); therefore, the medium needs to be pushed into the
2504 * Do it after blk_insert_bs() so blk_is_inserted(blk) returns the @load
2505 * value passed here (i.e. true). */
2506 blk_dev_change_media_cb(blk
, true);
2510 void qmp_x_blockdev_insert_medium(bool has_device
, const char *device
,
2511 bool has_id
, const char *id
,
2512 const char *node_name
, Error
**errp
)
2515 BlockDriverState
*bs
;
2517 blk
= qmp_get_blk(has_device
? device
: NULL
,
2524 bs
= bdrv_find_node(node_name
);
2526 error_setg(errp
, "Node '%s' not found", node_name
);
2530 if (bdrv_has_blk(bs
)) {
2531 error_setg(errp
, "Node '%s' is already in use", node_name
);
2535 qmp_blockdev_insert_anon_medium(blk
, bs
, errp
);
2538 void qmp_blockdev_change_medium(bool has_device
, const char *device
,
2539 bool has_id
, const char *id
,
2540 const char *filename
,
2541 bool has_format
, const char *format
,
2543 BlockdevChangeReadOnlyMode read_only
,
2547 BlockDriverState
*medium_bs
= NULL
;
2551 QDict
*options
= NULL
;
2554 blk
= qmp_get_blk(has_device
? device
: NULL
,
2562 blk_update_root_state(blk
);
2565 bdrv_flags
= blk_get_open_flags_from_root_state(blk
);
2566 bdrv_flags
&= ~(BDRV_O_TEMPORARY
| BDRV_O_SNAPSHOT
| BDRV_O_NO_BACKING
|
2569 if (!has_read_only
) {
2570 read_only
= BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN
;
2573 switch (read_only
) {
2574 case BLOCKDEV_CHANGE_READ_ONLY_MODE_RETAIN
:
2577 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_ONLY
:
2578 bdrv_flags
&= ~BDRV_O_RDWR
;
2581 case BLOCKDEV_CHANGE_READ_ONLY_MODE_READ_WRITE
:
2582 bdrv_flags
|= BDRV_O_RDWR
;
2589 options
= qdict_new();
2590 detect_zeroes
= blk_get_detect_zeroes_from_root_state(blk
);
2591 qdict_put(options
, "detect-zeroes",
2592 qstring_from_str(detect_zeroes
? "on" : "off"));
2595 qdict_put(options
, "driver", qstring_from_str(format
));
2598 medium_bs
= bdrv_open(filename
, NULL
, options
, bdrv_flags
, errp
);
2603 bdrv_add_key(medium_bs
, NULL
, &err
);
2605 error_propagate(errp
, err
);
2609 rc
= do_open_tray(has_device
? device
: NULL
,
2612 if (rc
&& rc
!= -ENOSYS
) {
2613 error_propagate(errp
, err
);
2619 qmp_x_blockdev_remove_medium(has_device
, device
, has_id
, id
, &err
);
2621 error_propagate(errp
, err
);
2625 qmp_blockdev_insert_anon_medium(blk
, medium_bs
, &err
);
2627 error_propagate(errp
, err
);
2631 qmp_blockdev_close_tray(has_device
, device
, has_id
, id
, errp
);
2634 /* If the medium has been inserted, the device has its own reference, so
2635 * ours must be relinquished; and if it has not been inserted successfully,
2636 * the reference must be relinquished anyway */
2637 bdrv_unref(medium_bs
);
2640 /* throttling disk I/O limits */
2641 void qmp_block_set_io_throttle(BlockIOThrottle
*arg
, Error
**errp
)
2644 BlockDriverState
*bs
;
2646 AioContext
*aio_context
;
2648 blk
= qmp_get_blk(arg
->has_device
? arg
->device
: NULL
,
2649 arg
->has_id
? arg
->id
: NULL
,
2655 aio_context
= blk_get_aio_context(blk
);
2656 aio_context_acquire(aio_context
);
2660 error_setg(errp
, "Device has no medium");
2664 throttle_config_init(&cfg
);
2665 cfg
.buckets
[THROTTLE_BPS_TOTAL
].avg
= arg
->bps
;
2666 cfg
.buckets
[THROTTLE_BPS_READ
].avg
= arg
->bps_rd
;
2667 cfg
.buckets
[THROTTLE_BPS_WRITE
].avg
= arg
->bps_wr
;
2669 cfg
.buckets
[THROTTLE_OPS_TOTAL
].avg
= arg
->iops
;
2670 cfg
.buckets
[THROTTLE_OPS_READ
].avg
= arg
->iops_rd
;
2671 cfg
.buckets
[THROTTLE_OPS_WRITE
].avg
= arg
->iops_wr
;
2673 if (arg
->has_bps_max
) {
2674 cfg
.buckets
[THROTTLE_BPS_TOTAL
].max
= arg
->bps_max
;
2676 if (arg
->has_bps_rd_max
) {
2677 cfg
.buckets
[THROTTLE_BPS_READ
].max
= arg
->bps_rd_max
;
2679 if (arg
->has_bps_wr_max
) {
2680 cfg
.buckets
[THROTTLE_BPS_WRITE
].max
= arg
->bps_wr_max
;
2682 if (arg
->has_iops_max
) {
2683 cfg
.buckets
[THROTTLE_OPS_TOTAL
].max
= arg
->iops_max
;
2685 if (arg
->has_iops_rd_max
) {
2686 cfg
.buckets
[THROTTLE_OPS_READ
].max
= arg
->iops_rd_max
;
2688 if (arg
->has_iops_wr_max
) {
2689 cfg
.buckets
[THROTTLE_OPS_WRITE
].max
= arg
->iops_wr_max
;
2692 if (arg
->has_bps_max_length
) {
2693 cfg
.buckets
[THROTTLE_BPS_TOTAL
].burst_length
= arg
->bps_max_length
;
2695 if (arg
->has_bps_rd_max_length
) {
2696 cfg
.buckets
[THROTTLE_BPS_READ
].burst_length
= arg
->bps_rd_max_length
;
2698 if (arg
->has_bps_wr_max_length
) {
2699 cfg
.buckets
[THROTTLE_BPS_WRITE
].burst_length
= arg
->bps_wr_max_length
;
2701 if (arg
->has_iops_max_length
) {
2702 cfg
.buckets
[THROTTLE_OPS_TOTAL
].burst_length
= arg
->iops_max_length
;
2704 if (arg
->has_iops_rd_max_length
) {
2705 cfg
.buckets
[THROTTLE_OPS_READ
].burst_length
= arg
->iops_rd_max_length
;
2707 if (arg
->has_iops_wr_max_length
) {
2708 cfg
.buckets
[THROTTLE_OPS_WRITE
].burst_length
= arg
->iops_wr_max_length
;
2711 if (arg
->has_iops_size
) {
2712 cfg
.op_size
= arg
->iops_size
;
2715 if (!throttle_is_valid(&cfg
, errp
)) {
2719 if (throttle_enabled(&cfg
)) {
2720 /* Enable I/O limits if they're not enabled yet, otherwise
2721 * just update the throttling group. */
2722 if (!blk_get_public(blk
)->throttle_state
) {
2723 blk_io_limits_enable(blk
,
2724 arg
->has_group
? arg
->group
:
2725 arg
->has_device
? arg
->device
:
2727 } else if (arg
->has_group
) {
2728 blk_io_limits_update_group(blk
, arg
->group
);
2730 /* Set the new throttling configuration */
2731 blk_set_io_limits(blk
, &cfg
);
2732 } else if (blk_get_public(blk
)->throttle_state
) {
2733 /* If all throttling settings are set to 0, disable I/O limits */
2734 blk_io_limits_disable(blk
);
2738 aio_context_release(aio_context
);
2741 void qmp_block_dirty_bitmap_add(const char *node
, const char *name
,
2742 bool has_granularity
, uint32_t granularity
,
2745 AioContext
*aio_context
;
2746 BlockDriverState
*bs
;
2748 if (!name
|| name
[0] == '\0') {
2749 error_setg(errp
, "Bitmap name cannot be empty");
2753 bs
= bdrv_lookup_bs(node
, node
, errp
);
2758 aio_context
= bdrv_get_aio_context(bs
);
2759 aio_context_acquire(aio_context
);
2761 if (has_granularity
) {
2762 if (granularity
< 512 || !is_power_of_2(granularity
)) {
2763 error_setg(errp
, "Granularity must be power of 2 "
2764 "and at least 512");
2768 /* Default to cluster size, if available: */
2769 granularity
= bdrv_get_default_bitmap_granularity(bs
);
2772 bdrv_create_dirty_bitmap(bs
, granularity
, name
, errp
);
2775 aio_context_release(aio_context
);
2778 void qmp_block_dirty_bitmap_remove(const char *node
, const char *name
,
2781 AioContext
*aio_context
;
2782 BlockDriverState
*bs
;
2783 BdrvDirtyBitmap
*bitmap
;
2785 bitmap
= block_dirty_bitmap_lookup(node
, name
, &bs
, &aio_context
, errp
);
2786 if (!bitmap
|| !bs
) {
2790 if (bdrv_dirty_bitmap_frozen(bitmap
)) {
2792 "Bitmap '%s' is currently frozen and cannot be removed",
2796 bdrv_dirty_bitmap_make_anon(bitmap
);
2797 bdrv_release_dirty_bitmap(bs
, bitmap
);
2800 aio_context_release(aio_context
);
2804 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2805 * immediately after a full backup operation.
2807 void qmp_block_dirty_bitmap_clear(const char *node
, const char *name
,
2810 AioContext
*aio_context
;
2811 BdrvDirtyBitmap
*bitmap
;
2812 BlockDriverState
*bs
;
2814 bitmap
= block_dirty_bitmap_lookup(node
, name
, &bs
, &aio_context
, errp
);
2815 if (!bitmap
|| !bs
) {
2819 if (bdrv_dirty_bitmap_frozen(bitmap
)) {
2821 "Bitmap '%s' is currently frozen and cannot be modified",
2824 } else if (!bdrv_dirty_bitmap_enabled(bitmap
)) {
2826 "Bitmap '%s' is currently disabled and cannot be cleared",
2831 bdrv_clear_dirty_bitmap(bitmap
, NULL
);
2834 aio_context_release(aio_context
);
2837 void hmp_drive_del(Monitor
*mon
, const QDict
*qdict
)
2839 const char *id
= qdict_get_str(qdict
, "id");
2841 BlockDriverState
*bs
;
2842 AioContext
*aio_context
;
2843 Error
*local_err
= NULL
;
2845 bs
= bdrv_find_node(id
);
2847 qmp_x_blockdev_del(id
, &local_err
);
2849 error_report_err(local_err
);
2854 blk
= blk_by_name(id
);
2856 error_report("Device '%s' not found", id
);
2860 if (!blk_legacy_dinfo(blk
)) {
2861 error_report("Deleting device added with blockdev-add"
2862 " is not supported");
2866 aio_context
= blk_get_aio_context(blk
);
2867 aio_context_acquire(aio_context
);
2871 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_DRIVE_DEL
, &local_err
)) {
2872 error_report_err(local_err
);
2873 aio_context_release(aio_context
);
2880 /* Make the BlockBackend and the attached BlockDriverState anonymous */
2881 monitor_remove_blk(blk
);
2883 /* If this BlockBackend has a device attached to it, its refcount will be
2884 * decremented when the device is removed; otherwise we have to do so here.
2886 if (blk_get_attached_dev(blk
)) {
2887 /* Further I/O must not pause the guest */
2888 blk_set_on_error(blk
, BLOCKDEV_ON_ERROR_REPORT
,
2889 BLOCKDEV_ON_ERROR_REPORT
);
2894 aio_context_release(aio_context
);
2897 void qmp_block_resize(bool has_device
, const char *device
,
2898 bool has_node_name
, const char *node_name
,
2899 int64_t size
, Error
**errp
)
2901 Error
*local_err
= NULL
;
2902 BlockDriverState
*bs
;
2903 AioContext
*aio_context
;
2906 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
2907 has_node_name
? node_name
: NULL
,
2910 error_propagate(errp
, local_err
);
2914 aio_context
= bdrv_get_aio_context(bs
);
2915 aio_context_acquire(aio_context
);
2917 if (!bdrv_is_first_non_filter(bs
)) {
2918 error_setg(errp
, QERR_FEATURE_DISABLED
, "resize");
2923 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "size", "a >0 size");
2927 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_RESIZE
, NULL
)) {
2928 error_setg(errp
, QERR_DEVICE_IN_USE
, device
);
2932 /* complete all in-flight operations before resizing the device */
2935 ret
= bdrv_truncate(bs
, size
);
2940 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
2943 error_setg(errp
, QERR_UNSUPPORTED
);
2946 error_setg(errp
, "Device '%s' is read only", device
);
2949 error_setg(errp
, QERR_DEVICE_IN_USE
, device
);
2952 error_setg_errno(errp
, -ret
, "Could not resize");
2957 aio_context_release(aio_context
);
2960 static void block_job_cb(void *opaque
, int ret
)
2962 /* Note that this function may be executed from another AioContext besides
2963 * the QEMU main loop. If you need to access anything that assumes the
2964 * QEMU global mutex, use a BH or introduce a mutex.
2967 BlockDriverState
*bs
= opaque
;
2968 const char *msg
= NULL
;
2970 trace_block_job_cb(bs
, bs
->job
, ret
);
2975 msg
= strerror(-ret
);
2978 if (block_job_is_cancelled(bs
->job
)) {
2979 block_job_event_cancelled(bs
->job
);
2981 block_job_event_completed(bs
->job
, msg
);
2985 void qmp_block_stream(bool has_job_id
, const char *job_id
, const char *device
,
2986 bool has_base
, const char *base
,
2987 bool has_backing_file
, const char *backing_file
,
2988 bool has_speed
, int64_t speed
,
2989 bool has_on_error
, BlockdevOnError on_error
,
2992 BlockDriverState
*bs
;
2993 BlockDriverState
*base_bs
= NULL
;
2994 AioContext
*aio_context
;
2995 Error
*local_err
= NULL
;
2996 const char *base_name
= NULL
;
2998 if (!has_on_error
) {
2999 on_error
= BLOCKDEV_ON_ERROR_REPORT
;
3002 bs
= qmp_get_root_bs(device
, errp
);
3007 aio_context
= bdrv_get_aio_context(bs
);
3008 aio_context_acquire(aio_context
);
3010 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_STREAM
, errp
)) {
3015 base_bs
= bdrv_find_backing_image(bs
, base
);
3016 if (base_bs
== NULL
) {
3017 error_setg(errp
, QERR_BASE_NOT_FOUND
, base
);
3020 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
3024 /* if we are streaming the entire chain, the result will have no backing
3025 * file, and specifying one is therefore an error */
3026 if (base_bs
== NULL
&& has_backing_file
) {
3027 error_setg(errp
, "backing file specified, but streaming the "
3032 /* backing_file string overrides base bs filename */
3033 base_name
= has_backing_file
? backing_file
: base_name
;
3035 stream_start(has_job_id
? job_id
: NULL
, bs
, base_bs
, base_name
,
3036 has_speed
? speed
: 0, on_error
, block_job_cb
, bs
, &local_err
);
3038 error_propagate(errp
, local_err
);
3042 trace_qmp_block_stream(bs
, bs
->job
);
3045 aio_context_release(aio_context
);
3048 void qmp_block_commit(bool has_job_id
, const char *job_id
, const char *device
,
3049 bool has_base
, const char *base
,
3050 bool has_top
, const char *top
,
3051 bool has_backing_file
, const char *backing_file
,
3052 bool has_speed
, int64_t speed
,
3055 BlockDriverState
*bs
;
3056 BlockDriverState
*base_bs
, *top_bs
;
3057 AioContext
*aio_context
;
3058 Error
*local_err
= NULL
;
3059 /* This will be part of the QMP command, if/when the
3060 * BlockdevOnError change for blkmirror makes it in
3062 BlockdevOnError on_error
= BLOCKDEV_ON_ERROR_REPORT
;
3069 * libvirt relies on the DeviceNotFound error class in order to probe for
3070 * live commit feature versions; for this to work, we must make sure to
3071 * perform the device lookup before any generic errors that may occur in a
3072 * scenario in which all optional arguments are omitted. */
3073 bs
= qmp_get_root_bs(device
, &local_err
);
3075 bs
= bdrv_lookup_bs(device
, device
, NULL
);
3077 error_free(local_err
);
3078 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
3079 "Device '%s' not found", device
);
3081 error_propagate(errp
, local_err
);
3086 aio_context
= bdrv_get_aio_context(bs
);
3087 aio_context_acquire(aio_context
);
3089 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_COMMIT_SOURCE
, errp
)) {
3093 /* default top_bs is the active layer */
3096 if (has_top
&& top
) {
3097 if (strcmp(bs
->filename
, top
) != 0) {
3098 top_bs
= bdrv_find_backing_image(bs
, top
);
3102 if (top_bs
== NULL
) {
3103 error_setg(errp
, "Top image file %s not found", top
? top
: "NULL");
3107 assert(bdrv_get_aio_context(top_bs
) == aio_context
);
3109 if (has_base
&& base
) {
3110 base_bs
= bdrv_find_backing_image(top_bs
, base
);
3112 base_bs
= bdrv_find_base(top_bs
);
3115 if (base_bs
== NULL
) {
3116 error_setg(errp
, QERR_BASE_NOT_FOUND
, base
? base
: "NULL");
3120 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
3122 if (bdrv_op_is_blocked(base_bs
, BLOCK_OP_TYPE_COMMIT_TARGET
, errp
)) {
3126 /* Do not allow attempts to commit an image into itself */
3127 if (top_bs
== base_bs
) {
3128 error_setg(errp
, "cannot commit an image into itself");
3133 if (has_backing_file
) {
3134 error_setg(errp
, "'backing-file' specified,"
3135 " but 'top' is the active layer");
3138 commit_active_start(has_job_id
? job_id
: NULL
, bs
, base_bs
, speed
,
3139 on_error
, block_job_cb
, bs
, &local_err
, false);
3141 commit_start(has_job_id
? job_id
: NULL
, bs
, base_bs
, top_bs
, speed
,
3142 on_error
, block_job_cb
, bs
,
3143 has_backing_file
? backing_file
: NULL
, &local_err
);
3145 if (local_err
!= NULL
) {
3146 error_propagate(errp
, local_err
);
3151 aio_context_release(aio_context
);
3154 static void do_drive_backup(DriveBackup
*backup
, BlockJobTxn
*txn
, Error
**errp
)
3156 BlockDriverState
*bs
;
3157 BlockDriverState
*target_bs
;
3158 BlockDriverState
*source
= NULL
;
3159 BdrvDirtyBitmap
*bmap
= NULL
;
3160 AioContext
*aio_context
;
3161 QDict
*options
= NULL
;
3162 Error
*local_err
= NULL
;
3166 if (!backup
->has_speed
) {
3169 if (!backup
->has_on_source_error
) {
3170 backup
->on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
3172 if (!backup
->has_on_target_error
) {
3173 backup
->on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
3175 if (!backup
->has_mode
) {
3176 backup
->mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
3178 if (!backup
->has_job_id
) {
3179 backup
->job_id
= NULL
;
3181 if (!backup
->has_compress
) {
3182 backup
->compress
= false;
3185 bs
= qmp_get_root_bs(backup
->device
, errp
);
3190 aio_context
= bdrv_get_aio_context(bs
);
3191 aio_context_acquire(aio_context
);
3193 if (!backup
->has_format
) {
3194 backup
->format
= backup
->mode
== NEW_IMAGE_MODE_EXISTING
?
3195 NULL
: (char*) bs
->drv
->format_name
;
3198 /* Early check to avoid creating target */
3199 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_BACKUP_SOURCE
, errp
)) {
3203 flags
= bs
->open_flags
| BDRV_O_RDWR
;
3205 /* See if we have a backing HD we can use to create our new image
3207 if (backup
->sync
== MIRROR_SYNC_MODE_TOP
) {
3208 source
= backing_bs(bs
);
3210 backup
->sync
= MIRROR_SYNC_MODE_FULL
;
3213 if (backup
->sync
== MIRROR_SYNC_MODE_NONE
) {
3217 size
= bdrv_getlength(bs
);
3219 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
3223 if (backup
->mode
!= NEW_IMAGE_MODE_EXISTING
) {
3224 assert(backup
->format
);
3226 bdrv_img_create(backup
->target
, backup
->format
, source
->filename
,
3227 source
->drv
->format_name
, NULL
,
3228 size
, flags
, &local_err
, false);
3230 bdrv_img_create(backup
->target
, backup
->format
, NULL
, NULL
, NULL
,
3231 size
, flags
, &local_err
, false);
3236 error_propagate(errp
, local_err
);
3240 if (backup
->format
) {
3241 options
= qdict_new();
3242 qdict_put(options
, "driver", qstring_from_str(backup
->format
));
3245 target_bs
= bdrv_open(backup
->target
, NULL
, options
, flags
, errp
);
3250 bdrv_set_aio_context(target_bs
, aio_context
);
3252 if (backup
->has_bitmap
) {
3253 bmap
= bdrv_find_dirty_bitmap(bs
, backup
->bitmap
);
3255 error_setg(errp
, "Bitmap '%s' could not be found", backup
->bitmap
);
3256 bdrv_unref(target_bs
);
3261 backup_start(backup
->job_id
, bs
, target_bs
, backup
->speed
, backup
->sync
,
3262 bmap
, backup
->compress
, backup
->on_source_error
,
3263 backup
->on_target_error
, block_job_cb
, bs
, txn
, &local_err
);
3264 bdrv_unref(target_bs
);
3265 if (local_err
!= NULL
) {
3266 error_propagate(errp
, local_err
);
3271 aio_context_release(aio_context
);
3274 void qmp_drive_backup(DriveBackup
*arg
, Error
**errp
)
3276 return do_drive_backup(arg
, NULL
, errp
);
3279 BlockDeviceInfoList
*qmp_query_named_block_nodes(Error
**errp
)
3281 return bdrv_named_nodes_list(errp
);
3284 void do_blockdev_backup(BlockdevBackup
*backup
, BlockJobTxn
*txn
, Error
**errp
)
3286 BlockDriverState
*bs
;
3287 BlockDriverState
*target_bs
;
3288 Error
*local_err
= NULL
;
3289 AioContext
*aio_context
;
3291 if (!backup
->has_speed
) {
3294 if (!backup
->has_on_source_error
) {
3295 backup
->on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
3297 if (!backup
->has_on_target_error
) {
3298 backup
->on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
3300 if (!backup
->has_job_id
) {
3301 backup
->job_id
= NULL
;
3303 if (!backup
->has_compress
) {
3304 backup
->compress
= false;
3307 bs
= qmp_get_root_bs(backup
->device
, errp
);
3312 aio_context
= bdrv_get_aio_context(bs
);
3313 aio_context_acquire(aio_context
);
3315 target_bs
= bdrv_lookup_bs(backup
->target
, backup
->target
, errp
);
3320 if (bdrv_get_aio_context(target_bs
) != aio_context
) {
3321 if (!bdrv_has_blk(target_bs
)) {
3322 /* The target BDS is not attached, we can safely move it to another
3324 bdrv_set_aio_context(target_bs
, aio_context
);
3326 error_setg(errp
, "Target is attached to a different thread from "
3331 backup_start(backup
->job_id
, bs
, target_bs
, backup
->speed
, backup
->sync
,
3332 NULL
, backup
->compress
, backup
->on_source_error
,
3333 backup
->on_target_error
, block_job_cb
, bs
, txn
, &local_err
);
3334 if (local_err
!= NULL
) {
3335 error_propagate(errp
, local_err
);
3338 aio_context_release(aio_context
);
3341 void qmp_blockdev_backup(BlockdevBackup
*arg
, Error
**errp
)
3343 do_blockdev_backup(arg
, NULL
, errp
);
3346 /* Parameter check and block job starting for drive mirroring.
3347 * Caller should hold @device and @target's aio context (must be the same).
3349 static void blockdev_mirror_common(const char *job_id
, BlockDriverState
*bs
,
3350 BlockDriverState
*target
,
3351 bool has_replaces
, const char *replaces
,
3352 enum MirrorSyncMode sync
,
3353 BlockMirrorBackingMode backing_mode
,
3354 bool has_speed
, int64_t speed
,
3355 bool has_granularity
, uint32_t granularity
,
3356 bool has_buf_size
, int64_t buf_size
,
3357 bool has_on_source_error
,
3358 BlockdevOnError on_source_error
,
3359 bool has_on_target_error
,
3360 BlockdevOnError on_target_error
,
3361 bool has_unmap
, bool unmap
,
3368 if (!has_on_source_error
) {
3369 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
3371 if (!has_on_target_error
) {
3372 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
3374 if (!has_granularity
) {
3377 if (!has_buf_size
) {
3384 if (granularity
!= 0 && (granularity
< 512 || granularity
> 1048576 * 64)) {
3385 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
3386 "a value in range [512B, 64MB]");
3389 if (granularity
& (granularity
- 1)) {
3390 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
3395 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_MIRROR_SOURCE
, errp
)) {
3398 if (bdrv_op_is_blocked(target
, BLOCK_OP_TYPE_MIRROR_TARGET
, errp
)) {
3402 if (!bs
->backing
&& sync
== MIRROR_SYNC_MODE_TOP
) {
3403 sync
= MIRROR_SYNC_MODE_FULL
;
3406 /* pass the node name to replace to mirror start since it's loose coupling
3407 * and will allow to check whether the node still exist at mirror completion
3409 mirror_start(job_id
, bs
, target
,
3410 has_replaces
? replaces
: NULL
,
3411 speed
, granularity
, buf_size
, sync
, backing_mode
,
3412 on_source_error
, on_target_error
, unmap
,
3413 block_job_cb
, bs
, errp
);
3416 void qmp_drive_mirror(DriveMirror
*arg
, Error
**errp
)
3418 BlockDriverState
*bs
;
3419 BlockDriverState
*source
, *target_bs
;
3420 AioContext
*aio_context
;
3421 BlockMirrorBackingMode backing_mode
;
3422 Error
*local_err
= NULL
;
3423 QDict
*options
= NULL
;
3426 const char *format
= arg
->format
;
3428 bs
= qmp_get_root_bs(arg
->device
, errp
);
3433 aio_context
= bdrv_get_aio_context(bs
);
3434 aio_context_acquire(aio_context
);
3436 if (!arg
->has_mode
) {
3437 arg
->mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
3440 if (!arg
->has_format
) {
3441 format
= (arg
->mode
== NEW_IMAGE_MODE_EXISTING
3442 ? NULL
: bs
->drv
->format_name
);
3445 flags
= bs
->open_flags
| BDRV_O_RDWR
;
3446 source
= backing_bs(bs
);
3447 if (!source
&& arg
->sync
== MIRROR_SYNC_MODE_TOP
) {
3448 arg
->sync
= MIRROR_SYNC_MODE_FULL
;
3450 if (arg
->sync
== MIRROR_SYNC_MODE_NONE
) {
3454 size
= bdrv_getlength(bs
);
3456 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
3460 if (arg
->has_replaces
) {
3461 BlockDriverState
*to_replace_bs
;
3462 AioContext
*replace_aio_context
;
3463 int64_t replace_size
;
3465 if (!arg
->has_node_name
) {
3466 error_setg(errp
, "a node-name must be provided when replacing a"
3467 " named node of the graph");
3471 to_replace_bs
= check_to_replace_node(bs
, arg
->replaces
, &local_err
);
3473 if (!to_replace_bs
) {
3474 error_propagate(errp
, local_err
);
3478 replace_aio_context
= bdrv_get_aio_context(to_replace_bs
);
3479 aio_context_acquire(replace_aio_context
);
3480 replace_size
= bdrv_getlength(to_replace_bs
);
3481 aio_context_release(replace_aio_context
);
3483 if (size
!= replace_size
) {
3484 error_setg(errp
, "cannot replace image with a mirror image of "
3490 if (arg
->mode
== NEW_IMAGE_MODE_ABSOLUTE_PATHS
) {
3491 backing_mode
= MIRROR_SOURCE_BACKING_CHAIN
;
3493 backing_mode
= MIRROR_OPEN_BACKING_CHAIN
;
3496 if ((arg
->sync
== MIRROR_SYNC_MODE_FULL
|| !source
)
3497 && arg
->mode
!= NEW_IMAGE_MODE_EXISTING
)
3499 /* create new image w/o backing file */
3501 bdrv_img_create(arg
->target
, format
,
3502 NULL
, NULL
, NULL
, size
, flags
, &local_err
, false);
3504 switch (arg
->mode
) {
3505 case NEW_IMAGE_MODE_EXISTING
:
3507 case NEW_IMAGE_MODE_ABSOLUTE_PATHS
:
3508 /* create new image with backing file */
3509 bdrv_img_create(arg
->target
, format
,
3511 source
->drv
->format_name
,
3512 NULL
, size
, flags
, &local_err
, false);
3520 error_propagate(errp
, local_err
);
3524 options
= qdict_new();
3525 if (arg
->has_node_name
) {
3526 qdict_put(options
, "node-name", qstring_from_str(arg
->node_name
));
3529 qdict_put(options
, "driver", qstring_from_str(format
));
3532 /* Mirroring takes care of copy-on-write using the source's backing
3535 target_bs
= bdrv_open(arg
->target
, NULL
, options
,
3536 flags
| BDRV_O_NO_BACKING
, errp
);
3541 bdrv_set_aio_context(target_bs
, aio_context
);
3543 blockdev_mirror_common(arg
->has_job_id
? arg
->job_id
: NULL
, bs
, target_bs
,
3544 arg
->has_replaces
, arg
->replaces
, arg
->sync
,
3545 backing_mode
, arg
->has_speed
, arg
->speed
,
3546 arg
->has_granularity
, arg
->granularity
,
3547 arg
->has_buf_size
, arg
->buf_size
,
3548 arg
->has_on_source_error
, arg
->on_source_error
,
3549 arg
->has_on_target_error
, arg
->on_target_error
,
3550 arg
->has_unmap
, arg
->unmap
,
3552 bdrv_unref(target_bs
);
3553 error_propagate(errp
, local_err
);
3555 aio_context_release(aio_context
);
3558 void qmp_blockdev_mirror(bool has_job_id
, const char *job_id
,
3559 const char *device
, const char *target
,
3560 bool has_replaces
, const char *replaces
,
3561 MirrorSyncMode sync
,
3562 bool has_speed
, int64_t speed
,
3563 bool has_granularity
, uint32_t granularity
,
3564 bool has_buf_size
, int64_t buf_size
,
3565 bool has_on_source_error
,
3566 BlockdevOnError on_source_error
,
3567 bool has_on_target_error
,
3568 BlockdevOnError on_target_error
,
3571 BlockDriverState
*bs
;
3572 BlockDriverState
*target_bs
;
3573 AioContext
*aio_context
;
3574 BlockMirrorBackingMode backing_mode
= MIRROR_LEAVE_BACKING_CHAIN
;
3575 Error
*local_err
= NULL
;
3577 bs
= qmp_get_root_bs(device
, errp
);
3582 target_bs
= bdrv_lookup_bs(target
, target
, errp
);
3587 aio_context
= bdrv_get_aio_context(bs
);
3588 aio_context_acquire(aio_context
);
3590 bdrv_set_aio_context(target_bs
, aio_context
);
3592 blockdev_mirror_common(has_job_id
? job_id
: NULL
, bs
, target_bs
,
3593 has_replaces
, replaces
, sync
, backing_mode
,
3595 has_granularity
, granularity
,
3596 has_buf_size
, buf_size
,
3597 has_on_source_error
, on_source_error
,
3598 has_on_target_error
, on_target_error
,
3601 error_propagate(errp
, local_err
);
3603 aio_context_release(aio_context
);
3606 /* Get a block job using its ID and acquire its AioContext */
3607 static BlockJob
*find_block_job(const char *id
, AioContext
**aio_context
,
3614 *aio_context
= NULL
;
3616 job
= block_job_get(id
);
3619 error_set(errp
, ERROR_CLASS_DEVICE_NOT_ACTIVE
,
3620 "Block job '%s' not found", id
);
3624 *aio_context
= blk_get_aio_context(job
->blk
);
3625 aio_context_acquire(*aio_context
);
3630 void qmp_block_job_set_speed(const char *device
, int64_t speed
, Error
**errp
)
3632 AioContext
*aio_context
;
3633 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3639 block_job_set_speed(job
, speed
, errp
);
3640 aio_context_release(aio_context
);
3643 void qmp_block_job_cancel(const char *device
,
3644 bool has_force
, bool force
, Error
**errp
)
3646 AioContext
*aio_context
;
3647 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3657 if (job
->user_paused
&& !force
) {
3658 error_setg(errp
, "The block job for device '%s' is currently paused",
3663 trace_qmp_block_job_cancel(job
);
3664 block_job_cancel(job
);
3666 aio_context_release(aio_context
);
3669 void qmp_block_job_pause(const char *device
, Error
**errp
)
3671 AioContext
*aio_context
;
3672 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3674 if (!job
|| job
->user_paused
) {
3678 job
->user_paused
= true;
3679 trace_qmp_block_job_pause(job
);
3680 block_job_pause(job
);
3681 aio_context_release(aio_context
);
3684 void qmp_block_job_resume(const char *device
, Error
**errp
)
3686 AioContext
*aio_context
;
3687 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3689 if (!job
|| !job
->user_paused
) {
3693 job
->user_paused
= false;
3694 trace_qmp_block_job_resume(job
);
3695 block_job_iostatus_reset(job
);
3696 block_job_resume(job
);
3697 aio_context_release(aio_context
);
3700 void qmp_block_job_complete(const char *device
, Error
**errp
)
3702 AioContext
*aio_context
;
3703 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3709 trace_qmp_block_job_complete(job
);
3710 block_job_complete(job
, errp
);
3711 aio_context_release(aio_context
);
3714 void qmp_change_backing_file(const char *device
,
3715 const char *image_node_name
,
3716 const char *backing_file
,
3719 BlockDriverState
*bs
= NULL
;
3720 AioContext
*aio_context
;
3721 BlockDriverState
*image_bs
= NULL
;
3722 Error
*local_err
= NULL
;
3727 bs
= qmp_get_root_bs(device
, errp
);
3732 aio_context
= bdrv_get_aio_context(bs
);
3733 aio_context_acquire(aio_context
);
3735 image_bs
= bdrv_lookup_bs(NULL
, image_node_name
, &local_err
);
3737 error_propagate(errp
, local_err
);
3742 error_setg(errp
, "image file not found");
3746 if (bdrv_find_base(image_bs
) == image_bs
) {
3747 error_setg(errp
, "not allowing backing file change on an image "
3748 "without a backing file");
3752 /* even though we are not necessarily operating on bs, we need it to
3753 * determine if block ops are currently prohibited on the chain */
3754 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_CHANGE
, errp
)) {
3758 /* final sanity check */
3759 if (!bdrv_chain_contains(bs
, image_bs
)) {
3760 error_setg(errp
, "'%s' and image file are not in the same chain",
3765 /* if not r/w, reopen to make r/w */
3766 open_flags
= image_bs
->open_flags
;
3767 ro
= bdrv_is_read_only(image_bs
);
3770 bdrv_reopen(image_bs
, open_flags
| BDRV_O_RDWR
, &local_err
);
3772 error_propagate(errp
, local_err
);
3777 ret
= bdrv_change_backing_file(image_bs
, backing_file
,
3778 image_bs
->drv
? image_bs
->drv
->format_name
: "");
3781 error_setg_errno(errp
, -ret
, "Could not change backing file to '%s'",
3783 /* don't exit here, so we can try to restore open flags if
3788 bdrv_reopen(image_bs
, open_flags
, &local_err
);
3789 error_propagate(errp
, local_err
);
3793 aio_context_release(aio_context
);
3796 void hmp_drive_add_node(Monitor
*mon
, const char *optstr
)
3800 Error
*local_err
= NULL
;
3802 opts
= qemu_opts_parse_noisily(&qemu_drive_opts
, optstr
, false);
3807 qdict
= qemu_opts_to_qdict(opts
, NULL
);
3809 if (!qdict_get_try_str(qdict
, "node-name")) {
3811 error_report("'node-name' needs to be specified");
3815 BlockDriverState
*bs
= bds_tree_init(qdict
, &local_err
);
3817 error_report_err(local_err
);
3821 QTAILQ_INSERT_TAIL(&monitor_bdrv_states
, bs
, monitor_list
);
3824 qemu_opts_del(opts
);
3827 void qmp_blockdev_add(BlockdevOptions
*options
, Error
**errp
)
3829 BlockDriverState
*bs
;
3831 Visitor
*v
= qmp_output_visitor_new(&obj
);
3833 Error
*local_err
= NULL
;
3835 visit_type_BlockdevOptions(v
, NULL
, &options
, &local_err
);
3837 error_propagate(errp
, local_err
);
3841 visit_complete(v
, &obj
);
3842 qdict
= qobject_to_qdict(obj
);
3844 qdict_flatten(qdict
);
3846 if (!qdict_get_try_str(qdict
, "node-name")) {
3847 error_setg(errp
, "'node-name' must be specified for the root node");
3851 bs
= bds_tree_init(qdict
, errp
);
3856 QTAILQ_INSERT_TAIL(&monitor_bdrv_states
, bs
, monitor_list
);
3858 if (bs
&& bdrv_key_required(bs
)) {
3859 QTAILQ_REMOVE(&monitor_bdrv_states
, bs
, monitor_list
);
3861 error_setg(errp
, "blockdev-add doesn't support encrypted devices");
3869 void qmp_x_blockdev_del(const char *node_name
, Error
**errp
)
3871 AioContext
*aio_context
;
3872 BlockDriverState
*bs
;
3874 bs
= bdrv_find_node(node_name
);
3876 error_setg(errp
, "Cannot find node %s", node_name
);
3879 if (bdrv_has_blk(bs
)) {
3880 error_setg(errp
, "Node %s is in use", node_name
);
3883 aio_context
= bdrv_get_aio_context(bs
);
3884 aio_context_acquire(aio_context
);
3886 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_DRIVE_DEL
, errp
)) {
3890 if (!bs
->monitor_list
.tqe_prev
) {
3891 error_setg(errp
, "Node %s is not owned by the monitor",
3896 if (bs
->refcnt
> 1) {
3897 error_setg(errp
, "Block device %s is in use",
3898 bdrv_get_device_or_node_name(bs
));
3902 QTAILQ_REMOVE(&monitor_bdrv_states
, bs
, monitor_list
);
3906 aio_context_release(aio_context
);
3909 static BdrvChild
*bdrv_find_child(BlockDriverState
*parent_bs
,
3910 const char *child_name
)
3914 QLIST_FOREACH(child
, &parent_bs
->children
, next
) {
3915 if (strcmp(child
->name
, child_name
) == 0) {
3923 void qmp_x_blockdev_change(const char *parent
, bool has_child
,
3924 const char *child
, bool has_node
,
3925 const char *node
, Error
**errp
)
3927 BlockDriverState
*parent_bs
, *new_bs
= NULL
;
3930 parent_bs
= bdrv_lookup_bs(parent
, parent
, errp
);
3935 if (has_child
== has_node
) {
3937 error_setg(errp
, "The parameters child and node are in conflict");
3939 error_setg(errp
, "Either child or node must be specified");
3945 p_child
= bdrv_find_child(parent_bs
, child
);
3947 error_setg(errp
, "Node '%s' does not have child '%s'",
3951 bdrv_del_child(parent_bs
, p_child
, errp
);
3955 new_bs
= bdrv_find_node(node
);
3957 error_setg(errp
, "Node '%s' not found", node
);
3960 bdrv_add_child(parent_bs
, new_bs
, errp
);
3964 BlockJobInfoList
*qmp_query_block_jobs(Error
**errp
)
3966 BlockJobInfoList
*head
= NULL
, **p_next
= &head
;
3969 for (job
= block_job_next(NULL
); job
; job
= block_job_next(job
)) {
3970 BlockJobInfoList
*elem
= g_new0(BlockJobInfoList
, 1);
3971 AioContext
*aio_context
= blk_get_aio_context(job
->blk
);
3973 aio_context_acquire(aio_context
);
3974 elem
->value
= block_job_query(job
);
3975 aio_context_release(aio_context
);
3978 p_next
= &elem
->next
;
3984 QemuOptsList qemu_common_drive_opts
= {
3986 .head
= QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts
.head
),
3990 .type
= QEMU_OPT_BOOL
,
3991 .help
= "enable/disable snapshot mode",
3994 .type
= QEMU_OPT_STRING
,
3995 .help
= "discard operation (ignore/off, unmap/on)",
3998 .type
= QEMU_OPT_STRING
,
3999 .help
= "host AIO implementation (threads, native)",
4001 .name
= BDRV_OPT_CACHE_WB
,
4002 .type
= QEMU_OPT_BOOL
,
4003 .help
= "Enable writeback mode",
4006 .type
= QEMU_OPT_STRING
,
4007 .help
= "disk format (raw, qcow2, ...)",
4010 .type
= QEMU_OPT_STRING
,
4011 .help
= "read error action",
4014 .type
= QEMU_OPT_STRING
,
4015 .help
= "write error action",
4017 .name
= BDRV_OPT_READ_ONLY
,
4018 .type
= QEMU_OPT_BOOL
,
4019 .help
= "open drive file as read-only",
4021 .name
= "throttling.iops-total",
4022 .type
= QEMU_OPT_NUMBER
,
4023 .help
= "limit total I/O operations per second",
4025 .name
= "throttling.iops-read",
4026 .type
= QEMU_OPT_NUMBER
,
4027 .help
= "limit read operations per second",
4029 .name
= "throttling.iops-write",
4030 .type
= QEMU_OPT_NUMBER
,
4031 .help
= "limit write operations per second",
4033 .name
= "throttling.bps-total",
4034 .type
= QEMU_OPT_NUMBER
,
4035 .help
= "limit total bytes per second",
4037 .name
= "throttling.bps-read",
4038 .type
= QEMU_OPT_NUMBER
,
4039 .help
= "limit read bytes per second",
4041 .name
= "throttling.bps-write",
4042 .type
= QEMU_OPT_NUMBER
,
4043 .help
= "limit write bytes per second",
4045 .name
= "throttling.iops-total-max",
4046 .type
= QEMU_OPT_NUMBER
,
4047 .help
= "I/O operations burst",
4049 .name
= "throttling.iops-read-max",
4050 .type
= QEMU_OPT_NUMBER
,
4051 .help
= "I/O operations read burst",
4053 .name
= "throttling.iops-write-max",
4054 .type
= QEMU_OPT_NUMBER
,
4055 .help
= "I/O operations write burst",
4057 .name
= "throttling.bps-total-max",
4058 .type
= QEMU_OPT_NUMBER
,
4059 .help
= "total bytes burst",
4061 .name
= "throttling.bps-read-max",
4062 .type
= QEMU_OPT_NUMBER
,
4063 .help
= "total bytes read burst",
4065 .name
= "throttling.bps-write-max",
4066 .type
= QEMU_OPT_NUMBER
,
4067 .help
= "total bytes write burst",
4069 .name
= "throttling.iops-total-max-length",
4070 .type
= QEMU_OPT_NUMBER
,
4071 .help
= "length of the iops-total-max burst period, in seconds",
4073 .name
= "throttling.iops-read-max-length",
4074 .type
= QEMU_OPT_NUMBER
,
4075 .help
= "length of the iops-read-max burst period, in seconds",
4077 .name
= "throttling.iops-write-max-length",
4078 .type
= QEMU_OPT_NUMBER
,
4079 .help
= "length of the iops-write-max burst period, in seconds",
4081 .name
= "throttling.bps-total-max-length",
4082 .type
= QEMU_OPT_NUMBER
,
4083 .help
= "length of the bps-total-max burst period, in seconds",
4085 .name
= "throttling.bps-read-max-length",
4086 .type
= QEMU_OPT_NUMBER
,
4087 .help
= "length of the bps-read-max burst period, in seconds",
4089 .name
= "throttling.bps-write-max-length",
4090 .type
= QEMU_OPT_NUMBER
,
4091 .help
= "length of the bps-write-max burst period, in seconds",
4093 .name
= "throttling.iops-size",
4094 .type
= QEMU_OPT_NUMBER
,
4095 .help
= "when limiting by iops max size of an I/O in bytes",
4097 .name
= "throttling.group",
4098 .type
= QEMU_OPT_STRING
,
4099 .help
= "name of the block throttling group",
4101 .name
= "copy-on-read",
4102 .type
= QEMU_OPT_BOOL
,
4103 .help
= "copy read data from backing file into image file",
4105 .name
= "detect-zeroes",
4106 .type
= QEMU_OPT_STRING
,
4107 .help
= "try to optimize zero writes (off, on, unmap)",
4109 .name
= "stats-account-invalid",
4110 .type
= QEMU_OPT_BOOL
,
4111 .help
= "whether to account for invalid I/O operations "
4112 "in the statistics",
4114 .name
= "stats-account-failed",
4115 .type
= QEMU_OPT_BOOL
,
4116 .help
= "whether to account for failed I/O operations "
4117 "in the statistics",
4119 { /* end of list */ }
4123 static QemuOptsList qemu_root_bds_opts
= {
4125 .head
= QTAILQ_HEAD_INITIALIZER(qemu_root_bds_opts
.head
),
4129 .type
= QEMU_OPT_STRING
,
4130 .help
= "discard operation (ignore/off, unmap/on)",
4133 .type
= QEMU_OPT_STRING
,
4134 .help
= "host AIO implementation (threads, native)",
4136 .name
= "copy-on-read",
4137 .type
= QEMU_OPT_BOOL
,
4138 .help
= "copy read data from backing file into image file",
4140 { /* end of list */ }
4144 QemuOptsList qemu_drive_opts
= {
4146 .head
= QTAILQ_HEAD_INITIALIZER(qemu_drive_opts
.head
),
4149 * no elements => accept any params
4150 * validation will happen later
4152 { /* end of list */ }