2 * QEMU host block devices
4 * Copyright (c) 2003-2008 Fabrice Bellard
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
9 * This file incorporates work covered by the following copyright and
12 * Copyright (c) 2003-2008 Fabrice Bellard
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
33 #include "sysemu/block-backend.h"
34 #include "sysemu/blockdev.h"
35 #include "hw/block/block.h"
36 #include "block/blockjob.h"
37 #include "block/throttle-groups.h"
38 #include "monitor/monitor.h"
39 #include "qemu/error-report.h"
40 #include "qemu/option.h"
41 #include "qemu/config-file.h"
42 #include "qapi/qmp/types.h"
43 #include "qapi-visit.h"
44 #include "qapi/qmp/qerror.h"
45 #include "qapi/qmp-output-visitor.h"
46 #include "qapi/util.h"
47 #include "sysemu/sysemu.h"
48 #include "block/block_int.h"
49 #include "qmp-commands.h"
51 #include "sysemu/arch_init.h"
53 static const char *const if_name
[IF_COUNT
] = {
57 [IF_FLOPPY
] = "floppy",
58 [IF_PFLASH
] = "pflash",
61 [IF_VIRTIO
] = "virtio",
65 static int if_max_devs
[IF_COUNT
] = {
67 * Do not change these numbers! They govern how drive option
68 * index maps to unit and bus. That mapping is ABI.
70 * All controllers used to imlement if=T drives need to support
71 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
72 * Otherwise, some index values map to "impossible" bus, unit
75 * For instance, if you change [IF_SCSI] to 255, -drive
76 * if=scsi,index=12 no longer means bus=1,unit=5, but
77 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
78 * the drive can't be set up. Regression.
85 * Boards may call this to offer board-by-board overrides
86 * of the default, global values.
88 void override_max_devs(BlockInterfaceType type
, int max_devs
)
97 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
98 dinfo
= blk_legacy_dinfo(blk
);
99 if (dinfo
->type
== type
) {
100 fprintf(stderr
, "Cannot override units-per-bus property of"
101 " the %s interface, because a drive of that type has"
102 " already been added.\n", if_name
[type
]);
103 g_assert_not_reached();
107 if_max_devs
[type
] = max_devs
;
111 * We automatically delete the drive when a device using it gets
112 * unplugged. Questionable feature, but we can't just drop it.
113 * Device models call blockdev_mark_auto_del() to schedule the
114 * automatic deletion, and generic qdev code calls blockdev_auto_del()
115 * when deletion is actually safe.
117 void blockdev_mark_auto_del(BlockBackend
*blk
)
119 DriveInfo
*dinfo
= blk_legacy_dinfo(blk
);
120 BlockDriverState
*bs
= blk_bs(blk
);
121 AioContext
*aio_context
;
128 aio_context
= bdrv_get_aio_context(bs
);
129 aio_context_acquire(aio_context
);
132 block_job_cancel(bs
->job
);
135 aio_context_release(aio_context
);
141 void blockdev_auto_del(BlockBackend
*blk
)
143 DriveInfo
*dinfo
= blk_legacy_dinfo(blk
);
145 if (dinfo
&& dinfo
->auto_del
) {
151 * Returns the current mapping of how many units per bus
152 * a particular interface can support.
154 * A positive integer indicates n units per bus.
155 * 0 implies the mapping has not been established.
156 * -1 indicates an invalid BlockInterfaceType was given.
158 int drive_get_max_devs(BlockInterfaceType type
)
160 if (type
>= IF_IDE
&& type
< IF_COUNT
) {
161 return if_max_devs
[type
];
167 static int drive_index_to_bus_id(BlockInterfaceType type
, int index
)
169 int max_devs
= if_max_devs
[type
];
170 return max_devs
? index
/ max_devs
: 0;
173 static int drive_index_to_unit_id(BlockInterfaceType type
, int index
)
175 int max_devs
= if_max_devs
[type
];
176 return max_devs
? index
% max_devs
: index
;
179 QemuOpts
*drive_def(const char *optstr
)
181 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr
, false);
184 QemuOpts
*drive_add(BlockInterfaceType type
, int index
, const char *file
,
189 opts
= drive_def(optstr
);
193 if (type
!= IF_DEFAULT
) {
194 qemu_opt_set(opts
, "if", if_name
[type
], &error_abort
);
197 qemu_opt_set_number(opts
, "index", index
, &error_abort
);
200 qemu_opt_set(opts
, "file", file
, &error_abort
);
204 DriveInfo
*drive_get(BlockInterfaceType type
, int bus
, int unit
)
209 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
210 dinfo
= blk_legacy_dinfo(blk
);
211 if (dinfo
&& dinfo
->type
== type
212 && dinfo
->bus
== bus
&& dinfo
->unit
== unit
) {
220 bool drive_check_orphaned(void)
226 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
227 dinfo
= blk_legacy_dinfo(blk
);
228 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
229 /* Unless this is a default drive, this may be an oversight. */
230 if (!blk_get_attached_dev(blk
) && !dinfo
->is_default
&&
231 dinfo
->type
!= IF_NONE
) {
232 fprintf(stderr
, "Warning: Orphaned drive without device: "
233 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
234 blk_name(blk
), blk_bs(blk
) ? blk_bs(blk
)->filename
: "",
235 if_name
[dinfo
->type
], dinfo
->bus
, dinfo
->unit
);
243 DriveInfo
*drive_get_by_index(BlockInterfaceType type
, int index
)
245 return drive_get(type
,
246 drive_index_to_bus_id(type
, index
),
247 drive_index_to_unit_id(type
, index
));
250 int drive_get_max_bus(BlockInterfaceType type
)
257 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
258 dinfo
= blk_legacy_dinfo(blk
);
259 if (dinfo
&& dinfo
->type
== type
&& dinfo
->bus
> max_bus
) {
260 max_bus
= dinfo
->bus
;
266 /* Get a block device. This should only be used for single-drive devices
267 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
269 DriveInfo
*drive_get_next(BlockInterfaceType type
)
271 static int next_block_unit
[IF_COUNT
];
273 return drive_get(type
, 0, next_block_unit
[type
]++);
276 static void bdrv_format_print(void *opaque
, const char *name
)
278 error_printf(" %s", name
);
283 BlockDriverState
*bs
;
286 static void bdrv_put_ref_bh(void *opaque
)
288 BDRVPutRefBH
*s
= opaque
;
291 qemu_bh_delete(s
->bh
);
296 * Release a BDS reference in a BH
298 * It is not safe to use bdrv_unref() from a callback function when the callers
299 * still need the BlockDriverState. In such cases we schedule a BH to release
302 static void bdrv_put_ref_bh_schedule(BlockDriverState
*bs
)
306 s
= g_new(BDRVPutRefBH
, 1);
307 s
->bh
= qemu_bh_new(bdrv_put_ref_bh
, s
);
309 qemu_bh_schedule(s
->bh
);
312 static int parse_block_error_action(const char *buf
, bool is_read
, Error
**errp
)
314 if (!strcmp(buf
, "ignore")) {
315 return BLOCKDEV_ON_ERROR_IGNORE
;
316 } else if (!is_read
&& !strcmp(buf
, "enospc")) {
317 return BLOCKDEV_ON_ERROR_ENOSPC
;
318 } else if (!strcmp(buf
, "stop")) {
319 return BLOCKDEV_ON_ERROR_STOP
;
320 } else if (!strcmp(buf
, "report")) {
321 return BLOCKDEV_ON_ERROR_REPORT
;
323 error_setg(errp
, "'%s' invalid %s error action",
324 buf
, is_read
? "read" : "write");
329 static bool check_throttle_config(ThrottleConfig
*cfg
, Error
**errp
)
331 if (throttle_conflicting(cfg
)) {
332 error_setg(errp
, "bps/iops/max total values and read/write values"
333 " cannot be used at the same time");
337 if (!throttle_is_valid(cfg
)) {
338 error_setg(errp
, "bps/iops/maxs values must be 0 or greater");
342 if (throttle_max_is_missing_limit(cfg
)) {
343 error_setg(errp
, "bps_max/iops_max require corresponding"
351 typedef enum { MEDIA_DISK
, MEDIA_CDROM
} DriveMediaType
;
353 /* All parameters but @opts are optional and may be set to NULL. */
354 static void extract_common_blockdev_options(QemuOpts
*opts
, int *bdrv_flags
,
355 const char **throttling_group
, ThrottleConfig
*throttle_cfg
,
356 BlockdevDetectZeroesOptions
*detect_zeroes
, Error
**errp
)
359 Error
*local_error
= NULL
;
363 if (!qemu_opt_get_bool(opts
, "read-only", false)) {
364 *bdrv_flags
|= BDRV_O_RDWR
;
366 if (qemu_opt_get_bool(opts
, "copy-on-read", false)) {
367 *bdrv_flags
|= BDRV_O_COPY_ON_READ
;
370 if ((discard
= qemu_opt_get(opts
, "discard")) != NULL
) {
371 if (bdrv_parse_discard_flags(discard
, bdrv_flags
) != 0) {
372 error_setg(errp
, "Invalid discard option");
377 if (qemu_opt_get_bool(opts
, BDRV_OPT_CACHE_WB
, true)) {
378 *bdrv_flags
|= BDRV_O_CACHE_WB
;
380 if (qemu_opt_get_bool(opts
, BDRV_OPT_CACHE_DIRECT
, false)) {
381 *bdrv_flags
|= BDRV_O_NOCACHE
;
383 if (qemu_opt_get_bool(opts
, BDRV_OPT_CACHE_NO_FLUSH
, false)) {
384 *bdrv_flags
|= BDRV_O_NO_FLUSH
;
387 if ((aio
= qemu_opt_get(opts
, "aio")) != NULL
) {
388 if (!strcmp(aio
, "native")) {
389 *bdrv_flags
|= BDRV_O_NATIVE_AIO
;
390 } else if (!strcmp(aio
, "threads")) {
391 /* this is the default */
393 error_setg(errp
, "invalid aio option");
399 /* disk I/O throttling */
400 if (throttling_group
) {
401 *throttling_group
= qemu_opt_get(opts
, "throttling.group");
405 memset(throttle_cfg
, 0, sizeof(*throttle_cfg
));
406 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].avg
=
407 qemu_opt_get_number(opts
, "throttling.bps-total", 0);
408 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].avg
=
409 qemu_opt_get_number(opts
, "throttling.bps-read", 0);
410 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].avg
=
411 qemu_opt_get_number(opts
, "throttling.bps-write", 0);
412 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].avg
=
413 qemu_opt_get_number(opts
, "throttling.iops-total", 0);
414 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].avg
=
415 qemu_opt_get_number(opts
, "throttling.iops-read", 0);
416 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].avg
=
417 qemu_opt_get_number(opts
, "throttling.iops-write", 0);
419 throttle_cfg
->buckets
[THROTTLE_BPS_TOTAL
].max
=
420 qemu_opt_get_number(opts
, "throttling.bps-total-max", 0);
421 throttle_cfg
->buckets
[THROTTLE_BPS_READ
].max
=
422 qemu_opt_get_number(opts
, "throttling.bps-read-max", 0);
423 throttle_cfg
->buckets
[THROTTLE_BPS_WRITE
].max
=
424 qemu_opt_get_number(opts
, "throttling.bps-write-max", 0);
425 throttle_cfg
->buckets
[THROTTLE_OPS_TOTAL
].max
=
426 qemu_opt_get_number(opts
, "throttling.iops-total-max", 0);
427 throttle_cfg
->buckets
[THROTTLE_OPS_READ
].max
=
428 qemu_opt_get_number(opts
, "throttling.iops-read-max", 0);
429 throttle_cfg
->buckets
[THROTTLE_OPS_WRITE
].max
=
430 qemu_opt_get_number(opts
, "throttling.iops-write-max", 0);
432 throttle_cfg
->op_size
=
433 qemu_opt_get_number(opts
, "throttling.iops-size", 0);
435 if (!check_throttle_config(throttle_cfg
, errp
)) {
442 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup
,
443 qemu_opt_get(opts
, "detect-zeroes"),
444 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX
,
445 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
,
448 error_propagate(errp
, local_error
);
453 *detect_zeroes
== BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP
&&
454 !(*bdrv_flags
& BDRV_O_UNMAP
))
456 error_setg(errp
, "setting detect-zeroes to unmap is not allowed "
457 "without setting discard operation to unmap");
463 /* Takes the ownership of bs_opts */
464 static BlockBackend
*blockdev_init(const char *file
, QDict
*bs_opts
,
469 int on_read_error
, on_write_error
;
471 BlockDriverState
*bs
;
477 bool has_driver_specific_opts
;
478 BlockdevDetectZeroesOptions detect_zeroes
=
479 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
;
480 const char *throttling_group
= NULL
;
482 /* Check common options by copying from bs_opts to opts, all other options
483 * stay in bs_opts for processing by bdrv_open(). */
484 id
= qdict_get_try_str(bs_opts
, "id");
485 opts
= qemu_opts_create(&qemu_common_drive_opts
, id
, 1, &error
);
487 error_propagate(errp
, error
);
491 qemu_opts_absorb_qdict(opts
, bs_opts
, &error
);
493 error_propagate(errp
, error
);
498 qdict_del(bs_opts
, "id");
501 has_driver_specific_opts
= !!qdict_size(bs_opts
);
503 /* extract parameters */
504 snapshot
= qemu_opt_get_bool(opts
, "snapshot", 0);
506 extract_common_blockdev_options(opts
, &bdrv_flags
, &throttling_group
, &cfg
,
507 &detect_zeroes
, &error
);
509 error_propagate(errp
, error
);
513 if ((buf
= qemu_opt_get(opts
, "format")) != NULL
) {
514 if (is_help_option(buf
)) {
515 error_printf("Supported formats:");
516 bdrv_iterate_format(bdrv_format_print
, NULL
);
521 if (qdict_haskey(bs_opts
, "driver")) {
522 error_setg(errp
, "Cannot specify both 'driver' and 'format'");
525 qdict_put(bs_opts
, "driver", qstring_from_str(buf
));
528 on_write_error
= BLOCKDEV_ON_ERROR_ENOSPC
;
529 if ((buf
= qemu_opt_get(opts
, "werror")) != NULL
) {
530 on_write_error
= parse_block_error_action(buf
, 0, &error
);
532 error_propagate(errp
, error
);
537 on_read_error
= BLOCKDEV_ON_ERROR_REPORT
;
538 if ((buf
= qemu_opt_get(opts
, "rerror")) != NULL
) {
539 on_read_error
= parse_block_error_action(buf
, 1, &error
);
541 error_propagate(errp
, error
);
547 /* always use cache=unsafe with snapshot */
548 bdrv_flags
&= ~BDRV_O_CACHE_MASK
;
549 bdrv_flags
|= (BDRV_O_SNAPSHOT
|BDRV_O_CACHE_WB
|BDRV_O_NO_FLUSH
);
553 if ((!file
|| !*file
) && !has_driver_specific_opts
) {
554 BlockBackendRootState
*blk_rs
;
556 blk
= blk_new(qemu_opts_id(opts
), errp
);
561 blk_rs
= blk_get_root_state(blk
);
562 blk_rs
->open_flags
= bdrv_flags
;
563 blk_rs
->read_only
= !(bdrv_flags
& BDRV_O_RDWR
);
564 blk_rs
->detect_zeroes
= detect_zeroes
;
566 if (throttle_enabled(&cfg
)) {
567 if (!throttling_group
) {
568 throttling_group
= blk_name(blk
);
570 blk_rs
->throttle_group
= g_strdup(throttling_group
);
571 blk_rs
->throttle_state
= throttle_group_incref(throttling_group
);
572 blk_rs
->throttle_state
->cfg
= cfg
;
577 if (file
&& !*file
) {
581 blk
= blk_new_open(qemu_opts_id(opts
), file
, NULL
, bs_opts
, bdrv_flags
,
588 bs
->detect_zeroes
= detect_zeroes
;
590 /* disk I/O throttling */
591 if (throttle_enabled(&cfg
)) {
592 if (!throttling_group
) {
593 throttling_group
= blk_name(blk
);
595 bdrv_io_limits_enable(bs
, throttling_group
);
596 bdrv_set_io_limits(bs
, &cfg
);
599 if (bdrv_key_required(bs
)) {
604 blk_set_on_error(blk
, on_read_error
, on_write_error
);
617 static QemuOptsList qemu_root_bds_opts
;
619 /* Takes the ownership of bs_opts */
620 static BlockDriverState
*bds_tree_init(QDict
*bs_opts
, Error
**errp
)
622 BlockDriverState
*bs
;
624 Error
*local_error
= NULL
;
625 BlockdevDetectZeroesOptions detect_zeroes
;
629 opts
= qemu_opts_create(&qemu_root_bds_opts
, NULL
, 1, errp
);
634 qemu_opts_absorb_qdict(opts
, bs_opts
, &local_error
);
636 error_propagate(errp
, local_error
);
640 extract_common_blockdev_options(opts
, &bdrv_flags
, NULL
, NULL
,
641 &detect_zeroes
, &local_error
);
643 error_propagate(errp
, local_error
);
648 ret
= bdrv_open(&bs
, NULL
, NULL
, bs_opts
, bdrv_flags
, errp
);
650 goto fail_no_bs_opts
;
653 bs
->detect_zeroes
= detect_zeroes
;
665 static void qemu_opt_rename(QemuOpts
*opts
, const char *from
, const char *to
,
670 value
= qemu_opt_get(opts
, from
);
672 if (qemu_opt_find(opts
, to
)) {
673 error_setg(errp
, "'%s' and its alias '%s' can't be used at the "
674 "same time", to
, from
);
679 /* rename all items in opts */
680 while ((value
= qemu_opt_get(opts
, from
))) {
681 qemu_opt_set(opts
, to
, value
, &error_abort
);
682 qemu_opt_unset(opts
, from
);
686 QemuOptsList qemu_legacy_drive_opts
= {
688 .head
= QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts
.head
),
692 .type
= QEMU_OPT_NUMBER
,
693 .help
= "bus number",
696 .type
= QEMU_OPT_NUMBER
,
697 .help
= "unit number (i.e. lun for scsi)",
700 .type
= QEMU_OPT_NUMBER
,
701 .help
= "index number",
704 .type
= QEMU_OPT_STRING
,
705 .help
= "media type (disk, cdrom)",
708 .type
= QEMU_OPT_STRING
,
709 .help
= "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
712 .type
= QEMU_OPT_NUMBER
,
713 .help
= "number of cylinders (ide disk geometry)",
716 .type
= QEMU_OPT_NUMBER
,
717 .help
= "number of heads (ide disk geometry)",
720 .type
= QEMU_OPT_NUMBER
,
721 .help
= "number of sectors (ide disk geometry)",
724 .type
= QEMU_OPT_STRING
,
725 .help
= "chs translation (auto, lba, none)",
728 .type
= QEMU_OPT_BOOL
,
729 .help
= "(deprecated, ignored)",
732 .type
= QEMU_OPT_STRING
,
733 .help
= "pci address (virtio only)",
736 .type
= QEMU_OPT_STRING
,
737 .help
= "disk serial number",
740 .type
= QEMU_OPT_STRING
,
744 /* Options that are passed on, but have special semantics with -drive */
747 .type
= QEMU_OPT_BOOL
,
748 .help
= "open drive file as read-only",
751 .type
= QEMU_OPT_STRING
,
752 .help
= "read error action",
755 .type
= QEMU_OPT_STRING
,
756 .help
= "write error action",
758 .name
= "copy-on-read",
759 .type
= QEMU_OPT_BOOL
,
760 .help
= "copy read data from backing file into image file",
763 { /* end of list */ }
767 DriveInfo
*drive_new(QemuOpts
*all_opts
, BlockInterfaceType block_default_type
)
771 DriveInfo
*dinfo
= NULL
;
773 QemuOpts
*legacy_opts
;
774 DriveMediaType media
= MEDIA_DISK
;
775 BlockInterfaceType type
;
776 int cyls
, heads
, secs
, translation
;
777 int max_devs
, bus_id
, unit_id
, index
;
779 const char *werror
, *rerror
;
780 bool read_only
= false;
783 const char *filename
;
784 Error
*local_err
= NULL
;
787 /* Change legacy command line options into QMP ones */
788 static const struct {
792 { "iops", "throttling.iops-total" },
793 { "iops_rd", "throttling.iops-read" },
794 { "iops_wr", "throttling.iops-write" },
796 { "bps", "throttling.bps-total" },
797 { "bps_rd", "throttling.bps-read" },
798 { "bps_wr", "throttling.bps-write" },
800 { "iops_max", "throttling.iops-total-max" },
801 { "iops_rd_max", "throttling.iops-read-max" },
802 { "iops_wr_max", "throttling.iops-write-max" },
804 { "bps_max", "throttling.bps-total-max" },
805 { "bps_rd_max", "throttling.bps-read-max" },
806 { "bps_wr_max", "throttling.bps-write-max" },
808 { "iops_size", "throttling.iops-size" },
810 { "group", "throttling.group" },
812 { "readonly", "read-only" },
815 for (i
= 0; i
< ARRAY_SIZE(opt_renames
); i
++) {
816 qemu_opt_rename(all_opts
, opt_renames
[i
].from
, opt_renames
[i
].to
,
819 error_report_err(local_err
);
824 value
= qemu_opt_get(all_opts
, "cache");
828 if (bdrv_parse_cache_flags(value
, &flags
) != 0) {
829 error_report("invalid cache option");
833 /* Specific options take precedence */
834 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_WB
)) {
835 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_WB
,
836 !!(flags
& BDRV_O_CACHE_WB
), &error_abort
);
838 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_DIRECT
)) {
839 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_DIRECT
,
840 !!(flags
& BDRV_O_NOCACHE
), &error_abort
);
842 if (!qemu_opt_get(all_opts
, BDRV_OPT_CACHE_NO_FLUSH
)) {
843 qemu_opt_set_bool(all_opts
, BDRV_OPT_CACHE_NO_FLUSH
,
844 !!(flags
& BDRV_O_NO_FLUSH
), &error_abort
);
846 qemu_opt_unset(all_opts
, "cache");
849 /* Get a QDict for processing the options */
850 bs_opts
= qdict_new();
851 qemu_opts_to_qdict(all_opts
, bs_opts
);
853 legacy_opts
= qemu_opts_create(&qemu_legacy_drive_opts
, NULL
, 0,
855 qemu_opts_absorb_qdict(legacy_opts
, bs_opts
, &local_err
);
857 error_report_err(local_err
);
861 /* Deprecated option boot=[on|off] */
862 if (qemu_opt_get(legacy_opts
, "boot") != NULL
) {
863 fprintf(stderr
, "qemu-kvm: boot=on|off is deprecated and will be "
864 "ignored. Future versions will reject this parameter. Please "
865 "update your scripts.\n");
869 value
= qemu_opt_get(legacy_opts
, "media");
871 if (!strcmp(value
, "disk")) {
873 } else if (!strcmp(value
, "cdrom")) {
877 error_report("'%s' invalid media", value
);
882 /* copy-on-read is disabled with a warning for read-only devices */
883 read_only
|= qemu_opt_get_bool(legacy_opts
, "read-only", false);
884 copy_on_read
= qemu_opt_get_bool(legacy_opts
, "copy-on-read", false);
886 if (read_only
&& copy_on_read
) {
887 error_report("warning: disabling copy-on-read on read-only drive");
888 copy_on_read
= false;
891 qdict_put(bs_opts
, "read-only",
892 qstring_from_str(read_only
? "on" : "off"));
893 qdict_put(bs_opts
, "copy-on-read",
894 qstring_from_str(copy_on_read
? "on" :"off"));
896 /* Controller type */
897 value
= qemu_opt_get(legacy_opts
, "if");
900 type
< IF_COUNT
&& strcmp(value
, if_name
[type
]);
903 if (type
== IF_COUNT
) {
904 error_report("unsupported bus type '%s'", value
);
908 type
= block_default_type
;
912 cyls
= qemu_opt_get_number(legacy_opts
, "cyls", 0);
913 heads
= qemu_opt_get_number(legacy_opts
, "heads", 0);
914 secs
= qemu_opt_get_number(legacy_opts
, "secs", 0);
916 if (cyls
|| heads
|| secs
) {
918 error_report("invalid physical cyls number");
922 error_report("invalid physical heads number");
926 error_report("invalid physical secs number");
931 translation
= BIOS_ATA_TRANSLATION_AUTO
;
932 value
= qemu_opt_get(legacy_opts
, "trans");
935 error_report("'%s' trans must be used with cyls, heads and secs",
939 if (!strcmp(value
, "none")) {
940 translation
= BIOS_ATA_TRANSLATION_NONE
;
941 } else if (!strcmp(value
, "lba")) {
942 translation
= BIOS_ATA_TRANSLATION_LBA
;
943 } else if (!strcmp(value
, "large")) {
944 translation
= BIOS_ATA_TRANSLATION_LARGE
;
945 } else if (!strcmp(value
, "rechs")) {
946 translation
= BIOS_ATA_TRANSLATION_RECHS
;
947 } else if (!strcmp(value
, "auto")) {
948 translation
= BIOS_ATA_TRANSLATION_AUTO
;
950 error_report("'%s' invalid translation type", value
);
955 if (media
== MEDIA_CDROM
) {
956 if (cyls
|| secs
|| heads
) {
957 error_report("CHS can't be set with media=cdrom");
962 /* Device address specified by bus/unit or index.
963 * If none was specified, try to find the first free one. */
964 bus_id
= qemu_opt_get_number(legacy_opts
, "bus", 0);
965 unit_id
= qemu_opt_get_number(legacy_opts
, "unit", -1);
966 index
= qemu_opt_get_number(legacy_opts
, "index", -1);
968 max_devs
= if_max_devs
[type
];
971 if (bus_id
!= 0 || unit_id
!= -1) {
972 error_report("index cannot be used with bus and unit");
975 bus_id
= drive_index_to_bus_id(type
, index
);
976 unit_id
= drive_index_to_unit_id(type
, index
);
981 while (drive_get(type
, bus_id
, unit_id
) != NULL
) {
983 if (max_devs
&& unit_id
>= max_devs
) {
990 if (max_devs
&& unit_id
>= max_devs
) {
991 error_report("unit %d too big (max is %d)", unit_id
, max_devs
- 1);
995 if (drive_get(type
, bus_id
, unit_id
) != NULL
) {
996 error_report("drive with bus=%d, unit=%d (index=%d) exists",
997 bus_id
, unit_id
, index
);
1002 serial
= qemu_opt_get(legacy_opts
, "serial");
1004 /* no id supplied -> create one */
1005 if (qemu_opts_id(all_opts
) == NULL
) {
1007 const char *mediastr
= "";
1008 if (type
== IF_IDE
|| type
== IF_SCSI
) {
1009 mediastr
= (media
== MEDIA_CDROM
) ? "-cd" : "-hd";
1012 new_id
= g_strdup_printf("%s%i%s%i", if_name
[type
], bus_id
,
1015 new_id
= g_strdup_printf("%s%s%i", if_name
[type
],
1018 qdict_put(bs_opts
, "id", qstring_from_str(new_id
));
1022 /* Add virtio block device */
1023 devaddr
= qemu_opt_get(legacy_opts
, "addr");
1024 if (devaddr
&& type
!= IF_VIRTIO
) {
1025 error_report("addr is not supported by this bus type");
1029 if (type
== IF_VIRTIO
) {
1031 devopts
= qemu_opts_create(qemu_find_opts("device"), NULL
, 0,
1033 if (arch_type
== QEMU_ARCH_S390X
) {
1034 qemu_opt_set(devopts
, "driver", "virtio-blk-ccw", &error_abort
);
1036 qemu_opt_set(devopts
, "driver", "virtio-blk-pci", &error_abort
);
1038 qemu_opt_set(devopts
, "drive", qdict_get_str(bs_opts
, "id"),
1041 qemu_opt_set(devopts
, "addr", devaddr
, &error_abort
);
1045 filename
= qemu_opt_get(legacy_opts
, "file");
1047 /* Check werror/rerror compatibility with if=... */
1048 werror
= qemu_opt_get(legacy_opts
, "werror");
1049 if (werror
!= NULL
) {
1050 if (type
!= IF_IDE
&& type
!= IF_SCSI
&& type
!= IF_VIRTIO
&&
1052 error_report("werror is not supported by this bus type");
1055 qdict_put(bs_opts
, "werror", qstring_from_str(werror
));
1058 rerror
= qemu_opt_get(legacy_opts
, "rerror");
1059 if (rerror
!= NULL
) {
1060 if (type
!= IF_IDE
&& type
!= IF_VIRTIO
&& type
!= IF_SCSI
&&
1062 error_report("rerror is not supported by this bus type");
1065 qdict_put(bs_opts
, "rerror", qstring_from_str(rerror
));
1068 /* Actual block device init: Functionality shared with blockdev-add */
1069 blk
= blockdev_init(filename
, bs_opts
, &local_err
);
1073 error_report_err(local_err
);
1080 /* Create legacy DriveInfo */
1081 dinfo
= g_malloc0(sizeof(*dinfo
));
1082 dinfo
->opts
= all_opts
;
1085 dinfo
->heads
= heads
;
1087 dinfo
->trans
= translation
;
1090 dinfo
->bus
= bus_id
;
1091 dinfo
->unit
= unit_id
;
1092 dinfo
->devaddr
= devaddr
;
1093 dinfo
->serial
= g_strdup(serial
);
1095 blk_set_legacy_dinfo(blk
, dinfo
);
1102 dinfo
->media_cd
= media
== MEDIA_CDROM
;
1109 qemu_opts_del(legacy_opts
);
1114 void hmp_commit(Monitor
*mon
, const QDict
*qdict
)
1116 const char *device
= qdict_get_str(qdict
, "device");
1120 if (!strcmp(device
, "all")) {
1121 ret
= bdrv_commit_all();
1123 BlockDriverState
*bs
;
1124 AioContext
*aio_context
;
1126 blk
= blk_by_name(device
);
1128 monitor_printf(mon
, "Device '%s' not found\n", device
);
1131 if (!blk_is_available(blk
)) {
1132 monitor_printf(mon
, "Device '%s' has no medium\n", device
);
1137 aio_context
= bdrv_get_aio_context(bs
);
1138 aio_context_acquire(aio_context
);
1140 ret
= bdrv_commit(bs
);
1142 aio_context_release(aio_context
);
1145 monitor_printf(mon
, "'commit' error for '%s': %s\n", device
,
1150 static void blockdev_do_action(TransactionActionKind type
, void *data
,
1153 TransactionAction action
;
1154 TransactionActionList list
;
1157 action
.u
.data
= data
;
1158 list
.value
= &action
;
1160 qmp_transaction(&list
, errp
);
1163 void qmp_blockdev_snapshot_sync(bool has_device
, const char *device
,
1164 bool has_node_name
, const char *node_name
,
1165 const char *snapshot_file
,
1166 bool has_snapshot_node_name
,
1167 const char *snapshot_node_name
,
1168 bool has_format
, const char *format
,
1169 bool has_mode
, NewImageMode mode
, Error
**errp
)
1171 BlockdevSnapshot snapshot
= {
1172 .has_device
= has_device
,
1173 .device
= (char *) device
,
1174 .has_node_name
= has_node_name
,
1175 .node_name
= (char *) node_name
,
1176 .snapshot_file
= (char *) snapshot_file
,
1177 .has_snapshot_node_name
= has_snapshot_node_name
,
1178 .snapshot_node_name
= (char *) snapshot_node_name
,
1179 .has_format
= has_format
,
1180 .format
= (char *) format
,
1181 .has_mode
= has_mode
,
1184 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
,
1188 void qmp_blockdev_snapshot_internal_sync(const char *device
,
1192 BlockdevSnapshotInternal snapshot
= {
1193 .device
= (char *) device
,
1194 .name
= (char *) name
1197 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
,
1201 SnapshotInfo
*qmp_blockdev_snapshot_delete_internal_sync(const char *device
,
1208 BlockDriverState
*bs
;
1210 AioContext
*aio_context
;
1211 QEMUSnapshotInfo sn
;
1212 Error
*local_err
= NULL
;
1213 SnapshotInfo
*info
= NULL
;
1216 blk
= blk_by_name(device
);
1218 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1219 "Device '%s' not found", device
);
1223 aio_context
= blk_get_aio_context(blk
);
1224 aio_context_acquire(aio_context
);
1235 error_setg(errp
, "Name or id must be provided");
1236 goto out_aio_context
;
1239 if (!blk_is_available(blk
)) {
1240 error_setg(errp
, "Device '%s' has no medium", device
);
1241 goto out_aio_context
;
1245 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE
, errp
)) {
1246 goto out_aio_context
;
1249 ret
= bdrv_snapshot_find_by_id_and_name(bs
, id
, name
, &sn
, &local_err
);
1251 error_propagate(errp
, local_err
);
1252 goto out_aio_context
;
1256 "Snapshot with id '%s' and name '%s' does not exist on "
1258 STR_OR_NULL(id
), STR_OR_NULL(name
), device
);
1259 goto out_aio_context
;
1262 bdrv_snapshot_delete(bs
, id
, name
, &local_err
);
1264 error_propagate(errp
, local_err
);
1265 goto out_aio_context
;
1268 aio_context_release(aio_context
);
1270 info
= g_new0(SnapshotInfo
, 1);
1271 info
->id
= g_strdup(sn
.id_str
);
1272 info
->name
= g_strdup(sn
.name
);
1273 info
->date_nsec
= sn
.date_nsec
;
1274 info
->date_sec
= sn
.date_sec
;
1275 info
->vm_state_size
= sn
.vm_state_size
;
1276 info
->vm_clock_nsec
= sn
.vm_clock_nsec
% 1000000000;
1277 info
->vm_clock_sec
= sn
.vm_clock_nsec
/ 1000000000;
1282 aio_context_release(aio_context
);
1287 * block_dirty_bitmap_lookup:
1288 * Return a dirty bitmap (if present), after validating
1289 * the node reference and bitmap names.
1291 * @node: The name of the BDS node to search for bitmaps
1292 * @name: The name of the bitmap to search for
1293 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1294 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1295 * @errp: Output pointer for error information. Can be NULL.
1297 * @return: A bitmap object on success, or NULL on failure.
1299 static BdrvDirtyBitmap
*block_dirty_bitmap_lookup(const char *node
,
1301 BlockDriverState
**pbs
,
1305 BlockDriverState
*bs
;
1306 BdrvDirtyBitmap
*bitmap
;
1307 AioContext
*aio_context
;
1310 error_setg(errp
, "Node cannot be NULL");
1314 error_setg(errp
, "Bitmap name cannot be NULL");
1317 bs
= bdrv_lookup_bs(node
, node
, NULL
);
1319 error_setg(errp
, "Node '%s' not found", node
);
1323 aio_context
= bdrv_get_aio_context(bs
);
1324 aio_context_acquire(aio_context
);
1326 bitmap
= bdrv_find_dirty_bitmap(bs
, name
);
1328 error_setg(errp
, "Dirty bitmap '%s' not found", name
);
1336 *paio
= aio_context
;
1338 aio_context_release(aio_context
);
1344 aio_context_release(aio_context
);
1348 /* New and old BlockDriverState structs for atomic group operations */
1350 typedef struct BlkTransactionState BlkTransactionState
;
1352 /* Only prepare() may fail. In a single transaction, only one of commit() or
1353 abort() will be called, clean() will always be called if it present. */
1354 typedef struct BdrvActionOps
{
1355 /* Size of state struct, in bytes. */
1356 size_t instance_size
;
1357 /* Prepare the work, must NOT be NULL. */
1358 void (*prepare
)(BlkTransactionState
*common
, Error
**errp
);
1359 /* Commit the changes, can be NULL. */
1360 void (*commit
)(BlkTransactionState
*common
);
1361 /* Abort the changes on fail, can be NULL. */
1362 void (*abort
)(BlkTransactionState
*common
);
1363 /* Clean up resource in the end, can be NULL. */
1364 void (*clean
)(BlkTransactionState
*common
);
1368 * This structure must be arranged as first member in child type, assuming
1369 * that compiler will also arrange it to the same address with parent instance.
1370 * Later it will be used in free().
1372 struct BlkTransactionState
{
1373 TransactionAction
*action
;
1374 const BdrvActionOps
*ops
;
1375 QSIMPLEQ_ENTRY(BlkTransactionState
) entry
;
1378 /* internal snapshot private data */
1379 typedef struct InternalSnapshotState
{
1380 BlkTransactionState common
;
1381 BlockDriverState
*bs
;
1382 AioContext
*aio_context
;
1383 QEMUSnapshotInfo sn
;
1385 } InternalSnapshotState
;
1387 static void internal_snapshot_prepare(BlkTransactionState
*common
,
1390 Error
*local_err
= NULL
;
1394 BlockDriverState
*bs
;
1395 QEMUSnapshotInfo old_sn
, *sn
;
1398 BlockdevSnapshotInternal
*internal
;
1399 InternalSnapshotState
*state
;
1402 g_assert(common
->action
->type
==
1403 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
);
1404 internal
= common
->action
->u
.blockdev_snapshot_internal_sync
;
1405 state
= DO_UPCAST(InternalSnapshotState
, common
, common
);
1407 /* 1. parse input */
1408 device
= internal
->device
;
1409 name
= internal
->name
;
1411 /* 2. check for validation */
1412 blk
= blk_by_name(device
);
1414 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1415 "Device '%s' not found", device
);
1419 /* AioContext is released in .clean() */
1420 state
->aio_context
= blk_get_aio_context(blk
);
1421 aio_context_acquire(state
->aio_context
);
1423 if (!blk_is_available(blk
)) {
1424 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1430 bdrv_drained_begin(bs
);
1432 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT
, errp
)) {
1436 if (bdrv_is_read_only(bs
)) {
1437 error_setg(errp
, "Device '%s' is read only", device
);
1441 if (!bdrv_can_snapshot(bs
)) {
1442 error_setg(errp
, "Block format '%s' used by device '%s' "
1443 "does not support internal snapshots",
1444 bs
->drv
->format_name
, device
);
1448 if (!strlen(name
)) {
1449 error_setg(errp
, "Name is empty");
1453 /* check whether a snapshot with name exist */
1454 ret
= bdrv_snapshot_find_by_id_and_name(bs
, NULL
, name
, &old_sn
,
1457 error_propagate(errp
, local_err
);
1461 "Snapshot with name '%s' already exists on device '%s'",
1466 /* 3. take the snapshot */
1468 pstrcpy(sn
->name
, sizeof(sn
->name
), name
);
1469 qemu_gettimeofday(&tv
);
1470 sn
->date_sec
= tv
.tv_sec
;
1471 sn
->date_nsec
= tv
.tv_usec
* 1000;
1472 sn
->vm_clock_nsec
= qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
);
1474 ret1
= bdrv_snapshot_create(bs
, sn
);
1476 error_setg_errno(errp
, -ret1
,
1477 "Failed to create snapshot '%s' on device '%s'",
1482 /* 4. succeed, mark a snapshot is created */
1483 state
->created
= true;
1486 static void internal_snapshot_abort(BlkTransactionState
*common
)
1488 InternalSnapshotState
*state
=
1489 DO_UPCAST(InternalSnapshotState
, common
, common
);
1490 BlockDriverState
*bs
= state
->bs
;
1491 QEMUSnapshotInfo
*sn
= &state
->sn
;
1492 Error
*local_error
= NULL
;
1494 if (!state
->created
) {
1498 if (bdrv_snapshot_delete(bs
, sn
->id_str
, sn
->name
, &local_error
) < 0) {
1499 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1500 "device '%s' in abort: %s",
1503 bdrv_get_device_name(bs
),
1504 error_get_pretty(local_error
));
1505 error_free(local_error
);
1509 static void internal_snapshot_clean(BlkTransactionState
*common
)
1511 InternalSnapshotState
*state
= DO_UPCAST(InternalSnapshotState
,
1514 if (state
->aio_context
) {
1516 bdrv_drained_end(state
->bs
);
1518 aio_context_release(state
->aio_context
);
1522 /* external snapshot private data */
1523 typedef struct ExternalSnapshotState
{
1524 BlkTransactionState common
;
1525 BlockDriverState
*old_bs
;
1526 BlockDriverState
*new_bs
;
1527 AioContext
*aio_context
;
1528 } ExternalSnapshotState
;
1530 static void external_snapshot_prepare(BlkTransactionState
*common
,
1535 Error
*local_err
= NULL
;
1536 bool has_device
= false;
1538 bool has_node_name
= false;
1539 const char *node_name
;
1540 bool has_snapshot_node_name
= false;
1541 const char *snapshot_node_name
;
1542 const char *new_image_file
;
1543 const char *format
= "qcow2";
1544 enum NewImageMode mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
1545 ExternalSnapshotState
*state
=
1546 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1547 TransactionAction
*action
= common
->action
;
1549 /* get parameters */
1550 g_assert(action
->type
== TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
);
1552 has_device
= action
->u
.blockdev_snapshot_sync
->has_device
;
1553 device
= action
->u
.blockdev_snapshot_sync
->device
;
1554 has_node_name
= action
->u
.blockdev_snapshot_sync
->has_node_name
;
1555 node_name
= action
->u
.blockdev_snapshot_sync
->node_name
;
1556 has_snapshot_node_name
=
1557 action
->u
.blockdev_snapshot_sync
->has_snapshot_node_name
;
1558 snapshot_node_name
= action
->u
.blockdev_snapshot_sync
->snapshot_node_name
;
1560 new_image_file
= action
->u
.blockdev_snapshot_sync
->snapshot_file
;
1561 if (action
->u
.blockdev_snapshot_sync
->has_format
) {
1562 format
= action
->u
.blockdev_snapshot_sync
->format
;
1564 if (action
->u
.blockdev_snapshot_sync
->has_mode
) {
1565 mode
= action
->u
.blockdev_snapshot_sync
->mode
;
1568 /* start processing */
1569 state
->old_bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
1570 has_node_name
? node_name
: NULL
,
1573 error_propagate(errp
, local_err
);
1577 if (has_node_name
&& !has_snapshot_node_name
) {
1578 error_setg(errp
, "New snapshot node name missing");
1582 if (has_snapshot_node_name
&& bdrv_find_node(snapshot_node_name
)) {
1583 error_setg(errp
, "New snapshot node name already existing");
1587 /* Acquire AioContext now so any threads operating on old_bs stop */
1588 state
->aio_context
= bdrv_get_aio_context(state
->old_bs
);
1589 aio_context_acquire(state
->aio_context
);
1590 bdrv_drained_begin(state
->old_bs
);
1592 if (!bdrv_is_inserted(state
->old_bs
)) {
1593 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1597 if (bdrv_op_is_blocked(state
->old_bs
,
1598 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
, errp
)) {
1602 if (!bdrv_is_read_only(state
->old_bs
)) {
1603 if (bdrv_flush(state
->old_bs
)) {
1604 error_setg(errp
, QERR_IO_ERROR
);
1609 if (!bdrv_is_first_non_filter(state
->old_bs
)) {
1610 error_setg(errp
, QERR_FEATURE_DISABLED
, "snapshot");
1614 flags
= state
->old_bs
->open_flags
;
1616 /* create new image w/backing file */
1617 if (mode
!= NEW_IMAGE_MODE_EXISTING
) {
1618 bdrv_img_create(new_image_file
, format
,
1619 state
->old_bs
->filename
,
1620 state
->old_bs
->drv
->format_name
,
1621 NULL
, -1, flags
, &local_err
, false);
1623 error_propagate(errp
, local_err
);
1628 options
= qdict_new();
1629 if (has_snapshot_node_name
) {
1630 qdict_put(options
, "node-name",
1631 qstring_from_str(snapshot_node_name
));
1633 qdict_put(options
, "driver", qstring_from_str(format
));
1635 /* TODO Inherit bs->options or only take explicit options with an
1636 * extended QMP command? */
1637 assert(state
->new_bs
== NULL
);
1638 ret
= bdrv_open(&state
->new_bs
, new_image_file
, NULL
, options
,
1639 flags
| BDRV_O_NO_BACKING
, &local_err
);
1640 /* We will manually add the backing_hd field to the bs later */
1642 error_propagate(errp
, local_err
);
1646 static void external_snapshot_commit(BlkTransactionState
*common
)
1648 ExternalSnapshotState
*state
=
1649 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1651 bdrv_set_aio_context(state
->new_bs
, state
->aio_context
);
1653 /* This removes our old bs and adds the new bs */
1654 bdrv_append(state
->new_bs
, state
->old_bs
);
1655 /* We don't need (or want) to use the transactional
1656 * bdrv_reopen_multiple() across all the entries at once, because we
1657 * don't want to abort all of them if one of them fails the reopen */
1658 bdrv_reopen(state
->old_bs
, state
->old_bs
->open_flags
& ~BDRV_O_RDWR
,
1662 static void external_snapshot_abort(BlkTransactionState
*common
)
1664 ExternalSnapshotState
*state
=
1665 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1666 if (state
->new_bs
) {
1667 bdrv_unref(state
->new_bs
);
1671 static void external_snapshot_clean(BlkTransactionState
*common
)
1673 ExternalSnapshotState
*state
=
1674 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1675 if (state
->aio_context
) {
1676 bdrv_drained_end(state
->old_bs
);
1677 aio_context_release(state
->aio_context
);
1681 typedef struct DriveBackupState
{
1682 BlkTransactionState common
;
1683 BlockDriverState
*bs
;
1684 AioContext
*aio_context
;
1688 static void drive_backup_prepare(BlkTransactionState
*common
, Error
**errp
)
1690 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1692 DriveBackup
*backup
;
1693 Error
*local_err
= NULL
;
1695 assert(common
->action
->type
== TRANSACTION_ACTION_KIND_DRIVE_BACKUP
);
1696 backup
= common
->action
->u
.drive_backup
;
1698 blk
= blk_by_name(backup
->device
);
1700 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1701 "Device '%s' not found", backup
->device
);
1705 if (!blk_is_available(blk
)) {
1706 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, backup
->device
);
1710 /* AioContext is released in .clean() */
1711 state
->aio_context
= blk_get_aio_context(blk
);
1712 aio_context_acquire(state
->aio_context
);
1713 bdrv_drained_begin(blk_bs(blk
));
1714 state
->bs
= blk_bs(blk
);
1716 qmp_drive_backup(backup
->device
, backup
->target
,
1717 backup
->has_format
, backup
->format
,
1719 backup
->has_mode
, backup
->mode
,
1720 backup
->has_speed
, backup
->speed
,
1721 backup
->has_bitmap
, backup
->bitmap
,
1722 backup
->has_on_source_error
, backup
->on_source_error
,
1723 backup
->has_on_target_error
, backup
->on_target_error
,
1726 error_propagate(errp
, local_err
);
1730 state
->job
= state
->bs
->job
;
1733 static void drive_backup_abort(BlkTransactionState
*common
)
1735 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1736 BlockDriverState
*bs
= state
->bs
;
1738 /* Only cancel if it's the job we started */
1739 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
1740 block_job_cancel_sync(bs
->job
);
1744 static void drive_backup_clean(BlkTransactionState
*common
)
1746 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1748 if (state
->aio_context
) {
1749 bdrv_drained_end(state
->bs
);
1750 aio_context_release(state
->aio_context
);
1754 typedef struct BlockdevBackupState
{
1755 BlkTransactionState common
;
1756 BlockDriverState
*bs
;
1758 AioContext
*aio_context
;
1759 } BlockdevBackupState
;
1761 static void blockdev_backup_prepare(BlkTransactionState
*common
, Error
**errp
)
1763 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1764 BlockdevBackup
*backup
;
1765 BlockBackend
*blk
, *target
;
1766 Error
*local_err
= NULL
;
1768 assert(common
->action
->type
== TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP
);
1769 backup
= common
->action
->u
.blockdev_backup
;
1771 blk
= blk_by_name(backup
->device
);
1773 error_setg(errp
, "Device '%s' not found", backup
->device
);
1777 if (!blk_is_available(blk
)) {
1778 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, backup
->device
);
1782 target
= blk_by_name(backup
->target
);
1784 error_setg(errp
, "Device '%s' not found", backup
->target
);
1788 /* AioContext is released in .clean() */
1789 state
->aio_context
= blk_get_aio_context(blk
);
1790 if (state
->aio_context
!= blk_get_aio_context(target
)) {
1791 state
->aio_context
= NULL
;
1792 error_setg(errp
, "Backup between two IO threads is not implemented");
1795 aio_context_acquire(state
->aio_context
);
1796 state
->bs
= blk_bs(blk
);
1797 bdrv_drained_begin(state
->bs
);
1799 qmp_blockdev_backup(backup
->device
, backup
->target
,
1801 backup
->has_speed
, backup
->speed
,
1802 backup
->has_on_source_error
, backup
->on_source_error
,
1803 backup
->has_on_target_error
, backup
->on_target_error
,
1806 error_propagate(errp
, local_err
);
1810 state
->job
= state
->bs
->job
;
1813 static void blockdev_backup_abort(BlkTransactionState
*common
)
1815 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1816 BlockDriverState
*bs
= state
->bs
;
1818 /* Only cancel if it's the job we started */
1819 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
1820 block_job_cancel_sync(bs
->job
);
1824 static void blockdev_backup_clean(BlkTransactionState
*common
)
1826 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1828 if (state
->aio_context
) {
1829 bdrv_drained_end(state
->bs
);
1830 aio_context_release(state
->aio_context
);
1834 static void abort_prepare(BlkTransactionState
*common
, Error
**errp
)
1836 error_setg(errp
, "Transaction aborted using Abort action");
1839 static void abort_commit(BlkTransactionState
*common
)
1841 g_assert_not_reached(); /* this action never succeeds */
1844 static const BdrvActionOps actions
[] = {
1845 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
] = {
1846 .instance_size
= sizeof(ExternalSnapshotState
),
1847 .prepare
= external_snapshot_prepare
,
1848 .commit
= external_snapshot_commit
,
1849 .abort
= external_snapshot_abort
,
1850 .clean
= external_snapshot_clean
,
1852 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP
] = {
1853 .instance_size
= sizeof(DriveBackupState
),
1854 .prepare
= drive_backup_prepare
,
1855 .abort
= drive_backup_abort
,
1856 .clean
= drive_backup_clean
,
1858 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP
] = {
1859 .instance_size
= sizeof(BlockdevBackupState
),
1860 .prepare
= blockdev_backup_prepare
,
1861 .abort
= blockdev_backup_abort
,
1862 .clean
= blockdev_backup_clean
,
1864 [TRANSACTION_ACTION_KIND_ABORT
] = {
1865 .instance_size
= sizeof(BlkTransactionState
),
1866 .prepare
= abort_prepare
,
1867 .commit
= abort_commit
,
1869 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
] = {
1870 .instance_size
= sizeof(InternalSnapshotState
),
1871 .prepare
= internal_snapshot_prepare
,
1872 .abort
= internal_snapshot_abort
,
1873 .clean
= internal_snapshot_clean
,
1878 * 'Atomic' group operations. The operations are performed as a set, and if
1879 * any fail then we roll back all operations in the group.
1881 void qmp_transaction(TransactionActionList
*dev_list
, Error
**errp
)
1883 TransactionActionList
*dev_entry
= dev_list
;
1884 BlkTransactionState
*state
, *next
;
1885 Error
*local_err
= NULL
;
1887 QSIMPLEQ_HEAD(snap_bdrv_states
, BlkTransactionState
) snap_bdrv_states
;
1888 QSIMPLEQ_INIT(&snap_bdrv_states
);
1890 /* drain all i/o before any operations */
1893 /* We don't do anything in this loop that commits us to the operations */
1894 while (NULL
!= dev_entry
) {
1895 TransactionAction
*dev_info
= NULL
;
1896 const BdrvActionOps
*ops
;
1898 dev_info
= dev_entry
->value
;
1899 dev_entry
= dev_entry
->next
;
1901 assert(dev_info
->type
< ARRAY_SIZE(actions
));
1903 ops
= &actions
[dev_info
->type
];
1904 assert(ops
->instance_size
> 0);
1906 state
= g_malloc0(ops
->instance_size
);
1908 state
->action
= dev_info
;
1909 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states
, state
, entry
);
1911 state
->ops
->prepare(state
, &local_err
);
1913 error_propagate(errp
, local_err
);
1914 goto delete_and_fail
;
1918 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
1919 if (state
->ops
->commit
) {
1920 state
->ops
->commit(state
);
1928 /* failure, and it is all-or-none; roll back all operations */
1929 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
1930 if (state
->ops
->abort
) {
1931 state
->ops
->abort(state
);
1935 QSIMPLEQ_FOREACH_SAFE(state
, &snap_bdrv_states
, entry
, next
) {
1936 if (state
->ops
->clean
) {
1937 state
->ops
->clean(state
);
1943 void qmp_eject(const char *device
, bool has_force
, bool force
, Error
**errp
)
1945 Error
*local_err
= NULL
;
1947 qmp_blockdev_open_tray(device
, has_force
, force
, &local_err
);
1949 error_propagate(errp
, local_err
);
1953 qmp_blockdev_remove_medium(device
, errp
);
1956 void qmp_block_passwd(bool has_device
, const char *device
,
1957 bool has_node_name
, const char *node_name
,
1958 const char *password
, Error
**errp
)
1960 Error
*local_err
= NULL
;
1961 BlockDriverState
*bs
;
1962 AioContext
*aio_context
;
1964 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
1965 has_node_name
? node_name
: NULL
,
1968 error_propagate(errp
, local_err
);
1972 aio_context
= bdrv_get_aio_context(bs
);
1973 aio_context_acquire(aio_context
);
1975 bdrv_add_key(bs
, password
, errp
);
1977 aio_context_release(aio_context
);
1980 void qmp_blockdev_open_tray(const char *device
, bool has_force
, bool force
,
1990 blk
= blk_by_name(device
);
1992 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1993 "Device '%s' not found", device
);
1997 if (!blk_dev_has_removable_media(blk
)) {
1998 error_setg(errp
, "Device '%s' is not removable", device
);
2002 if (blk_dev_is_tray_open(blk
)) {
2006 locked
= blk_dev_is_medium_locked(blk
);
2008 blk_dev_eject_request(blk
, force
);
2011 if (!locked
|| force
) {
2012 blk_dev_change_media_cb(blk
, false);
2016 void qmp_blockdev_close_tray(const char *device
, Error
**errp
)
2020 blk
= blk_by_name(device
);
2022 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2023 "Device '%s' not found", device
);
2027 if (!blk_dev_has_removable_media(blk
)) {
2028 error_setg(errp
, "Device '%s' is not removable", device
);
2032 if (!blk_dev_is_tray_open(blk
)) {
2036 blk_dev_change_media_cb(blk
, true);
2039 void qmp_blockdev_remove_medium(const char *device
, Error
**errp
)
2042 BlockDriverState
*bs
;
2043 AioContext
*aio_context
;
2046 blk
= blk_by_name(device
);
2048 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2049 "Device '%s' not found", device
);
2053 /* For BBs without a device, we can exchange the BDS tree at will */
2054 has_device
= blk_get_attached_dev(blk
);
2056 if (has_device
&& !blk_dev_has_removable_media(blk
)) {
2057 error_setg(errp
, "Device '%s' is not removable", device
);
2061 if (has_device
&& !blk_dev_is_tray_open(blk
)) {
2062 error_setg(errp
, "Tray of device '%s' is not open", device
);
2071 aio_context
= bdrv_get_aio_context(bs
);
2072 aio_context_acquire(aio_context
);
2074 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_EJECT
, errp
)) {
2078 /* This follows the convention established by bdrv_make_anon() */
2079 if (bs
->device_list
.tqe_prev
) {
2080 QTAILQ_REMOVE(&bdrv_states
, bs
, device_list
);
2081 bs
->device_list
.tqe_prev
= NULL
;
2087 aio_context_release(aio_context
);
2090 static void qmp_blockdev_insert_anon_medium(const char *device
,
2091 BlockDriverState
*bs
, Error
**errp
)
2096 blk
= blk_by_name(device
);
2098 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2099 "Device '%s' not found", device
);
2103 /* For BBs without a device, we can exchange the BDS tree at will */
2104 has_device
= blk_get_attached_dev(blk
);
2106 if (has_device
&& !blk_dev_has_removable_media(blk
)) {
2107 error_setg(errp
, "Device '%s' is not removable", device
);
2111 if (has_device
&& !blk_dev_is_tray_open(blk
)) {
2112 error_setg(errp
, "Tray of device '%s' is not open", device
);
2117 error_setg(errp
, "There already is a medium in device '%s'", device
);
2121 blk_insert_bs(blk
, bs
);
2123 QTAILQ_INSERT_TAIL(&bdrv_states
, bs
, device_list
);
2126 void qmp_blockdev_insert_medium(const char *device
, const char *node_name
,
2129 BlockDriverState
*bs
;
2131 bs
= bdrv_find_node(node_name
);
2133 error_setg(errp
, "Node '%s' not found", node_name
);
2138 error_setg(errp
, "Node '%s' is already in use by '%s'", node_name
,
2143 qmp_blockdev_insert_anon_medium(device
, bs
, errp
);
2146 void qmp_blockdev_change_medium(const char *device
, const char *filename
,
2147 bool has_format
, const char *format
,
2151 BlockDriverState
*medium_bs
= NULL
;
2152 int bdrv_flags
, ret
;
2153 QDict
*options
= NULL
;
2156 blk
= blk_by_name(device
);
2158 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2159 "Device '%s' not found", device
);
2164 blk_update_root_state(blk
);
2167 bdrv_flags
= blk_get_open_flags_from_root_state(blk
);
2170 options
= qdict_new();
2171 qdict_put(options
, "driver", qstring_from_str(format
));
2175 ret
= bdrv_open(&medium_bs
, filename
, NULL
, options
, bdrv_flags
, errp
);
2180 blk_apply_root_state(blk
, medium_bs
);
2182 bdrv_add_key(medium_bs
, NULL
, &err
);
2184 error_propagate(errp
, err
);
2188 qmp_blockdev_open_tray(device
, false, false, &err
);
2190 error_propagate(errp
, err
);
2194 qmp_blockdev_remove_medium(device
, &err
);
2196 error_propagate(errp
, err
);
2200 qmp_blockdev_insert_anon_medium(device
, medium_bs
, &err
);
2202 error_propagate(errp
, err
);
2206 qmp_blockdev_close_tray(device
, errp
);
2209 /* If the medium has been inserted, the device has its own reference, so
2210 * ours must be relinquished; and if it has not been inserted successfully,
2211 * the reference must be relinquished anyway */
2212 bdrv_unref(medium_bs
);
2215 /* throttling disk I/O limits */
2216 void qmp_block_set_io_throttle(const char *device
, int64_t bps
, int64_t bps_rd
,
2223 bool has_bps_rd_max
,
2225 bool has_bps_wr_max
,
2229 bool has_iops_rd_max
,
2230 int64_t iops_rd_max
,
2231 bool has_iops_wr_max
,
2232 int64_t iops_wr_max
,
2236 const char *group
, Error
**errp
)
2239 BlockDriverState
*bs
;
2241 AioContext
*aio_context
;
2243 blk
= blk_by_name(device
);
2245 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2246 "Device '%s' not found", device
);
2250 aio_context
= blk_get_aio_context(blk
);
2251 aio_context_acquire(aio_context
);
2255 error_setg(errp
, "Device '%s' has no medium", device
);
2259 memset(&cfg
, 0, sizeof(cfg
));
2260 cfg
.buckets
[THROTTLE_BPS_TOTAL
].avg
= bps
;
2261 cfg
.buckets
[THROTTLE_BPS_READ
].avg
= bps_rd
;
2262 cfg
.buckets
[THROTTLE_BPS_WRITE
].avg
= bps_wr
;
2264 cfg
.buckets
[THROTTLE_OPS_TOTAL
].avg
= iops
;
2265 cfg
.buckets
[THROTTLE_OPS_READ
].avg
= iops_rd
;
2266 cfg
.buckets
[THROTTLE_OPS_WRITE
].avg
= iops_wr
;
2269 cfg
.buckets
[THROTTLE_BPS_TOTAL
].max
= bps_max
;
2271 if (has_bps_rd_max
) {
2272 cfg
.buckets
[THROTTLE_BPS_READ
].max
= bps_rd_max
;
2274 if (has_bps_wr_max
) {
2275 cfg
.buckets
[THROTTLE_BPS_WRITE
].max
= bps_wr_max
;
2278 cfg
.buckets
[THROTTLE_OPS_TOTAL
].max
= iops_max
;
2280 if (has_iops_rd_max
) {
2281 cfg
.buckets
[THROTTLE_OPS_READ
].max
= iops_rd_max
;
2283 if (has_iops_wr_max
) {
2284 cfg
.buckets
[THROTTLE_OPS_WRITE
].max
= iops_wr_max
;
2287 if (has_iops_size
) {
2288 cfg
.op_size
= iops_size
;
2291 if (!check_throttle_config(&cfg
, errp
)) {
2295 if (throttle_enabled(&cfg
)) {
2296 /* Enable I/O limits if they're not enabled yet, otherwise
2297 * just update the throttling group. */
2298 if (!bs
->io_limits_enabled
) {
2299 bdrv_io_limits_enable(bs
, has_group
? group
: device
);
2300 } else if (has_group
) {
2301 bdrv_io_limits_update_group(bs
, group
);
2303 /* Set the new throttling configuration */
2304 bdrv_set_io_limits(bs
, &cfg
);
2305 } else if (bs
->io_limits_enabled
) {
2306 /* If all throttling settings are set to 0, disable I/O limits */
2307 bdrv_io_limits_disable(bs
);
2311 aio_context_release(aio_context
);
2314 void qmp_block_dirty_bitmap_add(const char *node
, const char *name
,
2315 bool has_granularity
, uint32_t granularity
,
2318 AioContext
*aio_context
;
2319 BlockDriverState
*bs
;
2321 if (!name
|| name
[0] == '\0') {
2322 error_setg(errp
, "Bitmap name cannot be empty");
2326 bs
= bdrv_lookup_bs(node
, node
, errp
);
2331 aio_context
= bdrv_get_aio_context(bs
);
2332 aio_context_acquire(aio_context
);
2334 if (has_granularity
) {
2335 if (granularity
< 512 || !is_power_of_2(granularity
)) {
2336 error_setg(errp
, "Granularity must be power of 2 "
2337 "and at least 512");
2341 /* Default to cluster size, if available: */
2342 granularity
= bdrv_get_default_bitmap_granularity(bs
);
2345 bdrv_create_dirty_bitmap(bs
, granularity
, name
, errp
);
2348 aio_context_release(aio_context
);
2351 void qmp_block_dirty_bitmap_remove(const char *node
, const char *name
,
2354 AioContext
*aio_context
;
2355 BlockDriverState
*bs
;
2356 BdrvDirtyBitmap
*bitmap
;
2358 bitmap
= block_dirty_bitmap_lookup(node
, name
, &bs
, &aio_context
, errp
);
2359 if (!bitmap
|| !bs
) {
2363 if (bdrv_dirty_bitmap_frozen(bitmap
)) {
2365 "Bitmap '%s' is currently frozen and cannot be removed",
2369 bdrv_dirty_bitmap_make_anon(bitmap
);
2370 bdrv_release_dirty_bitmap(bs
, bitmap
);
2373 aio_context_release(aio_context
);
2377 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2378 * immediately after a full backup operation.
2380 void qmp_block_dirty_bitmap_clear(const char *node
, const char *name
,
2383 AioContext
*aio_context
;
2384 BdrvDirtyBitmap
*bitmap
;
2385 BlockDriverState
*bs
;
2387 bitmap
= block_dirty_bitmap_lookup(node
, name
, &bs
, &aio_context
, errp
);
2388 if (!bitmap
|| !bs
) {
2392 if (bdrv_dirty_bitmap_frozen(bitmap
)) {
2394 "Bitmap '%s' is currently frozen and cannot be modified",
2397 } else if (!bdrv_dirty_bitmap_enabled(bitmap
)) {
2399 "Bitmap '%s' is currently disabled and cannot be cleared",
2404 bdrv_clear_dirty_bitmap(bitmap
);
2407 aio_context_release(aio_context
);
2410 void hmp_drive_del(Monitor
*mon
, const QDict
*qdict
)
2412 const char *id
= qdict_get_str(qdict
, "id");
2414 BlockDriverState
*bs
;
2415 AioContext
*aio_context
;
2416 Error
*local_err
= NULL
;
2418 blk
= blk_by_name(id
);
2420 error_report("Device '%s' not found", id
);
2424 if (!blk_legacy_dinfo(blk
)) {
2425 error_report("Deleting device added with blockdev-add"
2426 " is not supported");
2430 aio_context
= blk_get_aio_context(blk
);
2431 aio_context_acquire(aio_context
);
2435 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_DRIVE_DEL
, &local_err
)) {
2436 error_report_err(local_err
);
2437 aio_context_release(aio_context
);
2444 /* if we have a device attached to this BlockDriverState
2445 * then we need to make the drive anonymous until the device
2446 * can be removed. If this is a drive with no device backing
2447 * then we can just get rid of the block driver state right here.
2449 if (blk_get_attached_dev(blk
)) {
2450 blk_hide_on_behalf_of_hmp_drive_del(blk
);
2451 /* Further I/O must not pause the guest */
2452 blk_set_on_error(blk
, BLOCKDEV_ON_ERROR_REPORT
,
2453 BLOCKDEV_ON_ERROR_REPORT
);
2458 aio_context_release(aio_context
);
2461 void qmp_block_resize(bool has_device
, const char *device
,
2462 bool has_node_name
, const char *node_name
,
2463 int64_t size
, Error
**errp
)
2465 Error
*local_err
= NULL
;
2466 BlockDriverState
*bs
;
2467 AioContext
*aio_context
;
2470 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
2471 has_node_name
? node_name
: NULL
,
2474 error_propagate(errp
, local_err
);
2478 aio_context
= bdrv_get_aio_context(bs
);
2479 aio_context_acquire(aio_context
);
2481 if (!bdrv_is_first_non_filter(bs
)) {
2482 error_setg(errp
, QERR_FEATURE_DISABLED
, "resize");
2487 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "size", "a >0 size");
2491 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_RESIZE
, NULL
)) {
2492 error_setg(errp
, QERR_DEVICE_IN_USE
, device
);
2496 /* complete all in-flight operations before resizing the device */
2499 ret
= bdrv_truncate(bs
, size
);
2504 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
2507 error_setg(errp
, QERR_UNSUPPORTED
);
2510 error_setg(errp
, "Device '%s' is read only", device
);
2513 error_setg(errp
, QERR_DEVICE_IN_USE
, device
);
2516 error_setg_errno(errp
, -ret
, "Could not resize");
2521 aio_context_release(aio_context
);
2524 static void block_job_cb(void *opaque
, int ret
)
2526 /* Note that this function may be executed from another AioContext besides
2527 * the QEMU main loop. If you need to access anything that assumes the
2528 * QEMU global mutex, use a BH or introduce a mutex.
2531 BlockDriverState
*bs
= opaque
;
2532 const char *msg
= NULL
;
2534 trace_block_job_cb(bs
, bs
->job
, ret
);
2539 msg
= strerror(-ret
);
2542 if (block_job_is_cancelled(bs
->job
)) {
2543 block_job_event_cancelled(bs
->job
);
2545 block_job_event_completed(bs
->job
, msg
);
2548 bdrv_put_ref_bh_schedule(bs
);
2551 void qmp_block_stream(const char *device
,
2552 bool has_base
, const char *base
,
2553 bool has_backing_file
, const char *backing_file
,
2554 bool has_speed
, int64_t speed
,
2555 bool has_on_error
, BlockdevOnError on_error
,
2559 BlockDriverState
*bs
;
2560 BlockDriverState
*base_bs
= NULL
;
2561 AioContext
*aio_context
;
2562 Error
*local_err
= NULL
;
2563 const char *base_name
= NULL
;
2565 if (!has_on_error
) {
2566 on_error
= BLOCKDEV_ON_ERROR_REPORT
;
2569 blk
= blk_by_name(device
);
2571 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2572 "Device '%s' not found", device
);
2576 aio_context
= blk_get_aio_context(blk
);
2577 aio_context_acquire(aio_context
);
2579 if (!blk_is_available(blk
)) {
2580 error_setg(errp
, "Device '%s' has no medium", device
);
2585 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_STREAM
, errp
)) {
2590 base_bs
= bdrv_find_backing_image(bs
, base
);
2591 if (base_bs
== NULL
) {
2592 error_setg(errp
, QERR_BASE_NOT_FOUND
, base
);
2595 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
2599 /* if we are streaming the entire chain, the result will have no backing
2600 * file, and specifying one is therefore an error */
2601 if (base_bs
== NULL
&& has_backing_file
) {
2602 error_setg(errp
, "backing file specified, but streaming the "
2607 /* backing_file string overrides base bs filename */
2608 base_name
= has_backing_file
? backing_file
: base_name
;
2610 stream_start(bs
, base_bs
, base_name
, has_speed
? speed
: 0,
2611 on_error
, block_job_cb
, bs
, &local_err
);
2613 error_propagate(errp
, local_err
);
2617 trace_qmp_block_stream(bs
, bs
->job
);
2620 aio_context_release(aio_context
);
2623 void qmp_block_commit(const char *device
,
2624 bool has_base
, const char *base
,
2625 bool has_top
, const char *top
,
2626 bool has_backing_file
, const char *backing_file
,
2627 bool has_speed
, int64_t speed
,
2631 BlockDriverState
*bs
;
2632 BlockDriverState
*base_bs
, *top_bs
;
2633 AioContext
*aio_context
;
2634 Error
*local_err
= NULL
;
2635 /* This will be part of the QMP command, if/when the
2636 * BlockdevOnError change for blkmirror makes it in
2638 BlockdevOnError on_error
= BLOCKDEV_ON_ERROR_REPORT
;
2645 * libvirt relies on the DeviceNotFound error class in order to probe for
2646 * live commit feature versions; for this to work, we must make sure to
2647 * perform the device lookup before any generic errors that may occur in a
2648 * scenario in which all optional arguments are omitted. */
2649 blk
= blk_by_name(device
);
2651 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2652 "Device '%s' not found", device
);
2656 aio_context
= blk_get_aio_context(blk
);
2657 aio_context_acquire(aio_context
);
2659 if (!blk_is_available(blk
)) {
2660 error_setg(errp
, "Device '%s' has no medium", device
);
2665 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_COMMIT_SOURCE
, errp
)) {
2669 /* default top_bs is the active layer */
2672 if (has_top
&& top
) {
2673 if (strcmp(bs
->filename
, top
) != 0) {
2674 top_bs
= bdrv_find_backing_image(bs
, top
);
2678 if (top_bs
== NULL
) {
2679 error_setg(errp
, "Top image file %s not found", top
? top
: "NULL");
2683 assert(bdrv_get_aio_context(top_bs
) == aio_context
);
2685 if (has_base
&& base
) {
2686 base_bs
= bdrv_find_backing_image(top_bs
, base
);
2688 base_bs
= bdrv_find_base(top_bs
);
2691 if (base_bs
== NULL
) {
2692 error_setg(errp
, QERR_BASE_NOT_FOUND
, base
? base
: "NULL");
2696 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
2698 if (bdrv_op_is_blocked(base_bs
, BLOCK_OP_TYPE_COMMIT_TARGET
, errp
)) {
2702 /* Do not allow attempts to commit an image into itself */
2703 if (top_bs
== base_bs
) {
2704 error_setg(errp
, "cannot commit an image into itself");
2709 if (has_backing_file
) {
2710 error_setg(errp
, "'backing-file' specified,"
2711 " but 'top' is the active layer");
2714 commit_active_start(bs
, base_bs
, speed
, on_error
, block_job_cb
,
2717 commit_start(bs
, base_bs
, top_bs
, speed
, on_error
, block_job_cb
, bs
,
2718 has_backing_file
? backing_file
: NULL
, &local_err
);
2720 if (local_err
!= NULL
) {
2721 error_propagate(errp
, local_err
);
2726 aio_context_release(aio_context
);
2729 void qmp_drive_backup(const char *device
, const char *target
,
2730 bool has_format
, const char *format
,
2731 enum MirrorSyncMode sync
,
2732 bool has_mode
, enum NewImageMode mode
,
2733 bool has_speed
, int64_t speed
,
2734 bool has_bitmap
, const char *bitmap
,
2735 bool has_on_source_error
, BlockdevOnError on_source_error
,
2736 bool has_on_target_error
, BlockdevOnError on_target_error
,
2740 BlockDriverState
*bs
;
2741 BlockDriverState
*target_bs
;
2742 BlockDriverState
*source
= NULL
;
2743 BdrvDirtyBitmap
*bmap
= NULL
;
2744 AioContext
*aio_context
;
2745 QDict
*options
= NULL
;
2746 Error
*local_err
= NULL
;
2754 if (!has_on_source_error
) {
2755 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
2757 if (!has_on_target_error
) {
2758 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
2761 mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
2764 blk
= blk_by_name(device
);
2766 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2767 "Device '%s' not found", device
);
2771 aio_context
= blk_get_aio_context(blk
);
2772 aio_context_acquire(aio_context
);
2774 /* Although backup_run has this check too, we need to use bs->drv below, so
2775 * do an early check redundantly. */
2776 if (!blk_is_available(blk
)) {
2777 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
2783 format
= mode
== NEW_IMAGE_MODE_EXISTING
? NULL
: bs
->drv
->format_name
;
2786 /* Early check to avoid creating target */
2787 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_BACKUP_SOURCE
, errp
)) {
2791 flags
= bs
->open_flags
| BDRV_O_RDWR
;
2793 /* See if we have a backing HD we can use to create our new image
2795 if (sync
== MIRROR_SYNC_MODE_TOP
) {
2796 source
= backing_bs(bs
);
2798 sync
= MIRROR_SYNC_MODE_FULL
;
2801 if (sync
== MIRROR_SYNC_MODE_NONE
) {
2805 size
= bdrv_getlength(bs
);
2807 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
2811 if (mode
!= NEW_IMAGE_MODE_EXISTING
) {
2814 bdrv_img_create(target
, format
, source
->filename
,
2815 source
->drv
->format_name
, NULL
,
2816 size
, flags
, &local_err
, false);
2818 bdrv_img_create(target
, format
, NULL
, NULL
, NULL
,
2819 size
, flags
, &local_err
, false);
2824 error_propagate(errp
, local_err
);
2829 options
= qdict_new();
2830 qdict_put(options
, "driver", qstring_from_str(format
));
2834 ret
= bdrv_open(&target_bs
, target
, NULL
, options
, flags
, &local_err
);
2836 error_propagate(errp
, local_err
);
2840 bdrv_set_aio_context(target_bs
, aio_context
);
2843 bmap
= bdrv_find_dirty_bitmap(bs
, bitmap
);
2845 error_setg(errp
, "Bitmap '%s' could not be found", bitmap
);
2850 backup_start(bs
, target_bs
, speed
, sync
, bmap
,
2851 on_source_error
, on_target_error
,
2852 block_job_cb
, bs
, &local_err
);
2853 if (local_err
!= NULL
) {
2854 bdrv_unref(target_bs
);
2855 error_propagate(errp
, local_err
);
2860 aio_context_release(aio_context
);
2863 BlockDeviceInfoList
*qmp_query_named_block_nodes(Error
**errp
)
2865 return bdrv_named_nodes_list(errp
);
2868 void qmp_blockdev_backup(const char *device
, const char *target
,
2869 enum MirrorSyncMode sync
,
2870 bool has_speed
, int64_t speed
,
2871 bool has_on_source_error
,
2872 BlockdevOnError on_source_error
,
2873 bool has_on_target_error
,
2874 BlockdevOnError on_target_error
,
2877 BlockBackend
*blk
, *target_blk
;
2878 BlockDriverState
*bs
;
2879 BlockDriverState
*target_bs
;
2880 Error
*local_err
= NULL
;
2881 AioContext
*aio_context
;
2886 if (!has_on_source_error
) {
2887 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
2889 if (!has_on_target_error
) {
2890 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
2893 blk
= blk_by_name(device
);
2895 error_setg(errp
, "Device '%s' not found", device
);
2899 aio_context
= blk_get_aio_context(blk
);
2900 aio_context_acquire(aio_context
);
2902 if (!blk_is_available(blk
)) {
2903 error_setg(errp
, "Device '%s' has no medium", device
);
2908 target_blk
= blk_by_name(target
);
2910 error_setg(errp
, "Device '%s' not found", target
);
2914 if (!blk_is_available(target_blk
)) {
2915 error_setg(errp
, "Device '%s' has no medium", target
);
2918 target_bs
= blk_bs(target_blk
);
2920 bdrv_ref(target_bs
);
2921 bdrv_set_aio_context(target_bs
, aio_context
);
2922 backup_start(bs
, target_bs
, speed
, sync
, NULL
, on_source_error
,
2923 on_target_error
, block_job_cb
, bs
, &local_err
);
2924 if (local_err
!= NULL
) {
2925 bdrv_unref(target_bs
);
2926 error_propagate(errp
, local_err
);
2929 aio_context_release(aio_context
);
2932 void qmp_drive_mirror(const char *device
, const char *target
,
2933 bool has_format
, const char *format
,
2934 bool has_node_name
, const char *node_name
,
2935 bool has_replaces
, const char *replaces
,
2936 enum MirrorSyncMode sync
,
2937 bool has_mode
, enum NewImageMode mode
,
2938 bool has_speed
, int64_t speed
,
2939 bool has_granularity
, uint32_t granularity
,
2940 bool has_buf_size
, int64_t buf_size
,
2941 bool has_on_source_error
, BlockdevOnError on_source_error
,
2942 bool has_on_target_error
, BlockdevOnError on_target_error
,
2943 bool has_unmap
, bool unmap
,
2947 BlockDriverState
*bs
;
2948 BlockDriverState
*source
, *target_bs
;
2949 AioContext
*aio_context
;
2950 Error
*local_err
= NULL
;
2959 if (!has_on_source_error
) {
2960 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
2962 if (!has_on_target_error
) {
2963 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
2966 mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
2968 if (!has_granularity
) {
2971 if (!has_buf_size
) {
2978 if (granularity
!= 0 && (granularity
< 512 || granularity
> 1048576 * 64)) {
2979 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
2980 "a value in range [512B, 64MB]");
2983 if (granularity
& (granularity
- 1)) {
2984 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
2989 blk
= blk_by_name(device
);
2991 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2992 "Device '%s' not found", device
);
2996 aio_context
= blk_get_aio_context(blk
);
2997 aio_context_acquire(aio_context
);
2999 if (!blk_is_available(blk
)) {
3000 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
3006 format
= mode
== NEW_IMAGE_MODE_EXISTING
? NULL
: bs
->drv
->format_name
;
3009 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_MIRROR
, errp
)) {
3013 flags
= bs
->open_flags
| BDRV_O_RDWR
;
3014 source
= backing_bs(bs
);
3015 if (!source
&& sync
== MIRROR_SYNC_MODE_TOP
) {
3016 sync
= MIRROR_SYNC_MODE_FULL
;
3018 if (sync
== MIRROR_SYNC_MODE_NONE
) {
3022 size
= bdrv_getlength(bs
);
3024 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
3029 BlockDriverState
*to_replace_bs
;
3030 AioContext
*replace_aio_context
;
3031 int64_t replace_size
;
3033 if (!has_node_name
) {
3034 error_setg(errp
, "a node-name must be provided when replacing a"
3035 " named node of the graph");
3039 to_replace_bs
= check_to_replace_node(bs
, replaces
, &local_err
);
3041 if (!to_replace_bs
) {
3042 error_propagate(errp
, local_err
);
3046 replace_aio_context
= bdrv_get_aio_context(to_replace_bs
);
3047 aio_context_acquire(replace_aio_context
);
3048 replace_size
= bdrv_getlength(to_replace_bs
);
3049 aio_context_release(replace_aio_context
);
3051 if (size
!= replace_size
) {
3052 error_setg(errp
, "cannot replace image with a mirror image of "
3058 if ((sync
== MIRROR_SYNC_MODE_FULL
|| !source
)
3059 && mode
!= NEW_IMAGE_MODE_EXISTING
)
3061 /* create new image w/o backing file */
3063 bdrv_img_create(target
, format
,
3064 NULL
, NULL
, NULL
, size
, flags
, &local_err
, false);
3067 case NEW_IMAGE_MODE_EXISTING
:
3069 case NEW_IMAGE_MODE_ABSOLUTE_PATHS
:
3070 /* create new image with backing file */
3071 bdrv_img_create(target
, format
,
3073 source
->drv
->format_name
,
3074 NULL
, size
, flags
, &local_err
, false);
3082 error_propagate(errp
, local_err
);
3086 options
= qdict_new();
3087 if (has_node_name
) {
3088 qdict_put(options
, "node-name", qstring_from_str(node_name
));
3091 qdict_put(options
, "driver", qstring_from_str(format
));
3094 /* Mirroring takes care of copy-on-write using the source's backing
3098 ret
= bdrv_open(&target_bs
, target
, NULL
, options
,
3099 flags
| BDRV_O_NO_BACKING
, &local_err
);
3101 error_propagate(errp
, local_err
);
3105 bdrv_set_aio_context(target_bs
, aio_context
);
3107 /* pass the node name to replace to mirror start since it's loose coupling
3108 * and will allow to check whether the node still exist at mirror completion
3110 mirror_start(bs
, target_bs
,
3111 has_replaces
? replaces
: NULL
,
3112 speed
, granularity
, buf_size
, sync
,
3113 on_source_error
, on_target_error
,
3115 block_job_cb
, bs
, &local_err
);
3116 if (local_err
!= NULL
) {
3117 bdrv_unref(target_bs
);
3118 error_propagate(errp
, local_err
);
3123 aio_context_release(aio_context
);
3126 /* Get the block job for a given device name and acquire its AioContext */
3127 static BlockJob
*find_block_job(const char *device
, AioContext
**aio_context
,
3131 BlockDriverState
*bs
;
3133 *aio_context
= NULL
;
3135 blk
= blk_by_name(device
);
3140 *aio_context
= blk_get_aio_context(blk
);
3141 aio_context_acquire(*aio_context
);
3143 if (!blk_is_available(blk
)) {
3155 error_set(errp
, ERROR_CLASS_DEVICE_NOT_ACTIVE
,
3156 "No active block job on device '%s'", device
);
3158 aio_context_release(*aio_context
);
3159 *aio_context
= NULL
;
3164 void qmp_block_job_set_speed(const char *device
, int64_t speed
, Error
**errp
)
3166 AioContext
*aio_context
;
3167 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3173 block_job_set_speed(job
, speed
, errp
);
3174 aio_context_release(aio_context
);
3177 void qmp_block_job_cancel(const char *device
,
3178 bool has_force
, bool force
, Error
**errp
)
3180 AioContext
*aio_context
;
3181 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3191 if (job
->user_paused
&& !force
) {
3192 error_setg(errp
, "The block job for device '%s' is currently paused",
3197 trace_qmp_block_job_cancel(job
);
3198 block_job_cancel(job
);
3200 aio_context_release(aio_context
);
3203 void qmp_block_job_pause(const char *device
, Error
**errp
)
3205 AioContext
*aio_context
;
3206 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3208 if (!job
|| job
->user_paused
) {
3212 job
->user_paused
= true;
3213 trace_qmp_block_job_pause(job
);
3214 block_job_pause(job
);
3215 aio_context_release(aio_context
);
3218 void qmp_block_job_resume(const char *device
, Error
**errp
)
3220 AioContext
*aio_context
;
3221 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3223 if (!job
|| !job
->user_paused
) {
3227 job
->user_paused
= false;
3228 trace_qmp_block_job_resume(job
);
3229 block_job_resume(job
);
3230 aio_context_release(aio_context
);
3233 void qmp_block_job_complete(const char *device
, Error
**errp
)
3235 AioContext
*aio_context
;
3236 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3242 trace_qmp_block_job_complete(job
);
3243 block_job_complete(job
, errp
);
3244 aio_context_release(aio_context
);
3247 void qmp_change_backing_file(const char *device
,
3248 const char *image_node_name
,
3249 const char *backing_file
,
3253 BlockDriverState
*bs
= NULL
;
3254 AioContext
*aio_context
;
3255 BlockDriverState
*image_bs
= NULL
;
3256 Error
*local_err
= NULL
;
3261 blk
= blk_by_name(device
);
3263 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
3264 "Device '%s' not found", device
);
3268 aio_context
= blk_get_aio_context(blk
);
3269 aio_context_acquire(aio_context
);
3271 if (!blk_is_available(blk
)) {
3272 error_setg(errp
, "Device '%s' has no medium", device
);
3277 image_bs
= bdrv_lookup_bs(NULL
, image_node_name
, &local_err
);
3279 error_propagate(errp
, local_err
);
3284 error_setg(errp
, "image file not found");
3288 if (bdrv_find_base(image_bs
) == image_bs
) {
3289 error_setg(errp
, "not allowing backing file change on an image "
3290 "without a backing file");
3294 /* even though we are not necessarily operating on bs, we need it to
3295 * determine if block ops are currently prohibited on the chain */
3296 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_CHANGE
, errp
)) {
3300 /* final sanity check */
3301 if (!bdrv_chain_contains(bs
, image_bs
)) {
3302 error_setg(errp
, "'%s' and image file are not in the same chain",
3307 /* if not r/w, reopen to make r/w */
3308 open_flags
= image_bs
->open_flags
;
3309 ro
= bdrv_is_read_only(image_bs
);
3312 bdrv_reopen(image_bs
, open_flags
| BDRV_O_RDWR
, &local_err
);
3314 error_propagate(errp
, local_err
);
3319 ret
= bdrv_change_backing_file(image_bs
, backing_file
,
3320 image_bs
->drv
? image_bs
->drv
->format_name
: "");
3323 error_setg_errno(errp
, -ret
, "Could not change backing file to '%s'",
3325 /* don't exit here, so we can try to restore open flags if
3330 bdrv_reopen(image_bs
, open_flags
, &local_err
);
3332 error_propagate(errp
, local_err
); /* will preserve prior errp */
3337 aio_context_release(aio_context
);
3340 void qmp_blockdev_add(BlockdevOptions
*options
, Error
**errp
)
3342 QmpOutputVisitor
*ov
= qmp_output_visitor_new();
3343 BlockDriverState
*bs
;
3344 BlockBackend
*blk
= NULL
;
3347 Error
*local_err
= NULL
;
3349 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3350 * cache.direct=false instead of silently switching to aio=threads, except
3351 * when called from drive_new().
3353 * For now, simply forbidding the combination for all drivers will do. */
3354 if (options
->has_aio
&& options
->aio
== BLOCKDEV_AIO_OPTIONS_NATIVE
) {
3355 bool direct
= options
->has_cache
&&
3356 options
->cache
->has_direct
&&
3357 options
->cache
->direct
;
3359 error_setg(errp
, "aio=native requires cache.direct=true");
3364 visit_type_BlockdevOptions(qmp_output_get_visitor(ov
),
3365 &options
, NULL
, &local_err
);
3367 error_propagate(errp
, local_err
);
3371 obj
= qmp_output_get_qobject(ov
);
3372 qdict
= qobject_to_qdict(obj
);
3374 qdict_flatten(qdict
);
3376 if (options
->has_id
) {
3377 blk
= blockdev_init(NULL
, qdict
, &local_err
);
3379 error_propagate(errp
, local_err
);
3385 if (!qdict_get_try_str(qdict
, "node-name")) {
3386 error_setg(errp
, "'id' and/or 'node-name' need to be specified for "
3391 bs
= bds_tree_init(qdict
, errp
);
3397 if (bs
&& bdrv_key_required(bs
)) {
3403 error_setg(errp
, "blockdev-add doesn't support encrypted devices");
3408 qmp_output_visitor_cleanup(ov
);
3411 BlockJobInfoList
*qmp_query_block_jobs(Error
**errp
)
3413 BlockJobInfoList
*head
= NULL
, **p_next
= &head
;
3414 BlockDriverState
*bs
;
3416 for (bs
= bdrv_next(NULL
); bs
; bs
= bdrv_next(bs
)) {
3417 AioContext
*aio_context
= bdrv_get_aio_context(bs
);
3419 aio_context_acquire(aio_context
);
3422 BlockJobInfoList
*elem
= g_new0(BlockJobInfoList
, 1);
3423 elem
->value
= block_job_query(bs
->job
);
3425 p_next
= &elem
->next
;
3428 aio_context_release(aio_context
);
3434 QemuOptsList qemu_common_drive_opts
= {
3436 .head
= QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts
.head
),
3440 .type
= QEMU_OPT_BOOL
,
3441 .help
= "enable/disable snapshot mode",
3444 .type
= QEMU_OPT_STRING
,
3445 .help
= "discard operation (ignore/off, unmap/on)",
3447 .name
= BDRV_OPT_CACHE_WB
,
3448 .type
= QEMU_OPT_BOOL
,
3449 .help
= "enables writeback mode for any caches",
3451 .name
= BDRV_OPT_CACHE_DIRECT
,
3452 .type
= QEMU_OPT_BOOL
,
3453 .help
= "enables use of O_DIRECT (bypass the host page cache)",
3455 .name
= BDRV_OPT_CACHE_NO_FLUSH
,
3456 .type
= QEMU_OPT_BOOL
,
3457 .help
= "ignore any flush requests for the device",
3460 .type
= QEMU_OPT_STRING
,
3461 .help
= "host AIO implementation (threads, native)",
3464 .type
= QEMU_OPT_STRING
,
3465 .help
= "disk format (raw, qcow2, ...)",
3468 .type
= QEMU_OPT_STRING
,
3469 .help
= "read error action",
3472 .type
= QEMU_OPT_STRING
,
3473 .help
= "write error action",
3475 .name
= "read-only",
3476 .type
= QEMU_OPT_BOOL
,
3477 .help
= "open drive file as read-only",
3479 .name
= "throttling.iops-total",
3480 .type
= QEMU_OPT_NUMBER
,
3481 .help
= "limit total I/O operations per second",
3483 .name
= "throttling.iops-read",
3484 .type
= QEMU_OPT_NUMBER
,
3485 .help
= "limit read operations per second",
3487 .name
= "throttling.iops-write",
3488 .type
= QEMU_OPT_NUMBER
,
3489 .help
= "limit write operations per second",
3491 .name
= "throttling.bps-total",
3492 .type
= QEMU_OPT_NUMBER
,
3493 .help
= "limit total bytes per second",
3495 .name
= "throttling.bps-read",
3496 .type
= QEMU_OPT_NUMBER
,
3497 .help
= "limit read bytes per second",
3499 .name
= "throttling.bps-write",
3500 .type
= QEMU_OPT_NUMBER
,
3501 .help
= "limit write bytes per second",
3503 .name
= "throttling.iops-total-max",
3504 .type
= QEMU_OPT_NUMBER
,
3505 .help
= "I/O operations burst",
3507 .name
= "throttling.iops-read-max",
3508 .type
= QEMU_OPT_NUMBER
,
3509 .help
= "I/O operations read burst",
3511 .name
= "throttling.iops-write-max",
3512 .type
= QEMU_OPT_NUMBER
,
3513 .help
= "I/O operations write burst",
3515 .name
= "throttling.bps-total-max",
3516 .type
= QEMU_OPT_NUMBER
,
3517 .help
= "total bytes burst",
3519 .name
= "throttling.bps-read-max",
3520 .type
= QEMU_OPT_NUMBER
,
3521 .help
= "total bytes read burst",
3523 .name
= "throttling.bps-write-max",
3524 .type
= QEMU_OPT_NUMBER
,
3525 .help
= "total bytes write burst",
3527 .name
= "throttling.iops-size",
3528 .type
= QEMU_OPT_NUMBER
,
3529 .help
= "when limiting by iops max size of an I/O in bytes",
3531 .name
= "throttling.group",
3532 .type
= QEMU_OPT_STRING
,
3533 .help
= "name of the block throttling group",
3535 .name
= "copy-on-read",
3536 .type
= QEMU_OPT_BOOL
,
3537 .help
= "copy read data from backing file into image file",
3539 .name
= "detect-zeroes",
3540 .type
= QEMU_OPT_STRING
,
3541 .help
= "try to optimize zero writes (off, on, unmap)",
3543 { /* end of list */ }
3547 static QemuOptsList qemu_root_bds_opts
= {
3549 .head
= QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts
.head
),
3553 .type
= QEMU_OPT_STRING
,
3554 .help
= "discard operation (ignore/off, unmap/on)",
3556 .name
= "cache.writeback",
3557 .type
= QEMU_OPT_BOOL
,
3558 .help
= "enables writeback mode for any caches",
3560 .name
= "cache.direct",
3561 .type
= QEMU_OPT_BOOL
,
3562 .help
= "enables use of O_DIRECT (bypass the host page cache)",
3564 .name
= "cache.no-flush",
3565 .type
= QEMU_OPT_BOOL
,
3566 .help
= "ignore any flush requests for the device",
3569 .type
= QEMU_OPT_STRING
,
3570 .help
= "host AIO implementation (threads, native)",
3572 .name
= "read-only",
3573 .type
= QEMU_OPT_BOOL
,
3574 .help
= "open drive file as read-only",
3576 .name
= "copy-on-read",
3577 .type
= QEMU_OPT_BOOL
,
3578 .help
= "copy read data from backing file into image file",
3580 .name
= "detect-zeroes",
3581 .type
= QEMU_OPT_STRING
,
3582 .help
= "try to optimize zero writes (off, on, unmap)",
3584 { /* end of list */ }
3588 QemuOptsList qemu_drive_opts
= {
3590 .head
= QTAILQ_HEAD_INITIALIZER(qemu_drive_opts
.head
),
3593 * no elements => accept any params
3594 * validation will happen later
3596 { /* end of list */ }