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 blk
= blk_by_name(device
);
1125 monitor_printf(mon
, "Device '%s' not found\n", device
);
1128 if (!blk_is_available(blk
)) {
1129 monitor_printf(mon
, "Device '%s' has no medium\n", device
);
1132 ret
= bdrv_commit(blk_bs(blk
));
1135 monitor_printf(mon
, "'commit' error for '%s': %s\n", device
,
1140 static void blockdev_do_action(int kind
, void *data
, Error
**errp
)
1142 TransactionAction action
;
1143 TransactionActionList list
;
1147 list
.value
= &action
;
1149 qmp_transaction(&list
, errp
);
1152 void qmp_blockdev_snapshot_sync(bool has_device
, const char *device
,
1153 bool has_node_name
, const char *node_name
,
1154 const char *snapshot_file
,
1155 bool has_snapshot_node_name
,
1156 const char *snapshot_node_name
,
1157 bool has_format
, const char *format
,
1158 bool has_mode
, NewImageMode mode
, Error
**errp
)
1160 BlockdevSnapshot snapshot
= {
1161 .has_device
= has_device
,
1162 .device
= (char *) device
,
1163 .has_node_name
= has_node_name
,
1164 .node_name
= (char *) node_name
,
1165 .snapshot_file
= (char *) snapshot_file
,
1166 .has_snapshot_node_name
= has_snapshot_node_name
,
1167 .snapshot_node_name
= (char *) snapshot_node_name
,
1168 .has_format
= has_format
,
1169 .format
= (char *) format
,
1170 .has_mode
= has_mode
,
1173 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
,
1177 void qmp_blockdev_snapshot_internal_sync(const char *device
,
1181 BlockdevSnapshotInternal snapshot
= {
1182 .device
= (char *) device
,
1183 .name
= (char *) name
1186 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
,
1190 SnapshotInfo
*qmp_blockdev_snapshot_delete_internal_sync(const char *device
,
1197 BlockDriverState
*bs
;
1199 AioContext
*aio_context
;
1200 QEMUSnapshotInfo sn
;
1201 Error
*local_err
= NULL
;
1202 SnapshotInfo
*info
= NULL
;
1205 blk
= blk_by_name(device
);
1207 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1208 "Device '%s' not found", device
);
1212 aio_context
= blk_get_aio_context(blk
);
1213 aio_context_acquire(aio_context
);
1224 error_setg(errp
, "Name or id must be provided");
1225 goto out_aio_context
;
1228 if (!blk_is_available(blk
)) {
1229 error_setg(errp
, "Device '%s' has no medium", device
);
1230 goto out_aio_context
;
1234 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE
, errp
)) {
1235 goto out_aio_context
;
1238 ret
= bdrv_snapshot_find_by_id_and_name(bs
, id
, name
, &sn
, &local_err
);
1240 error_propagate(errp
, local_err
);
1241 goto out_aio_context
;
1245 "Snapshot with id '%s' and name '%s' does not exist on "
1247 STR_OR_NULL(id
), STR_OR_NULL(name
), device
);
1248 goto out_aio_context
;
1251 bdrv_snapshot_delete(bs
, id
, name
, &local_err
);
1253 error_propagate(errp
, local_err
);
1254 goto out_aio_context
;
1257 aio_context_release(aio_context
);
1259 info
= g_new0(SnapshotInfo
, 1);
1260 info
->id
= g_strdup(sn
.id_str
);
1261 info
->name
= g_strdup(sn
.name
);
1262 info
->date_nsec
= sn
.date_nsec
;
1263 info
->date_sec
= sn
.date_sec
;
1264 info
->vm_state_size
= sn
.vm_state_size
;
1265 info
->vm_clock_nsec
= sn
.vm_clock_nsec
% 1000000000;
1266 info
->vm_clock_sec
= sn
.vm_clock_nsec
/ 1000000000;
1271 aio_context_release(aio_context
);
1276 * block_dirty_bitmap_lookup:
1277 * Return a dirty bitmap (if present), after validating
1278 * the node reference and bitmap names.
1280 * @node: The name of the BDS node to search for bitmaps
1281 * @name: The name of the bitmap to search for
1282 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1283 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1284 * @errp: Output pointer for error information. Can be NULL.
1286 * @return: A bitmap object on success, or NULL on failure.
1288 static BdrvDirtyBitmap
*block_dirty_bitmap_lookup(const char *node
,
1290 BlockDriverState
**pbs
,
1294 BlockDriverState
*bs
;
1295 BdrvDirtyBitmap
*bitmap
;
1296 AioContext
*aio_context
;
1299 error_setg(errp
, "Node cannot be NULL");
1303 error_setg(errp
, "Bitmap name cannot be NULL");
1306 bs
= bdrv_lookup_bs(node
, node
, NULL
);
1308 error_setg(errp
, "Node '%s' not found", node
);
1312 aio_context
= bdrv_get_aio_context(bs
);
1313 aio_context_acquire(aio_context
);
1315 bitmap
= bdrv_find_dirty_bitmap(bs
, name
);
1317 error_setg(errp
, "Dirty bitmap '%s' not found", name
);
1325 *paio
= aio_context
;
1327 aio_context_release(aio_context
);
1333 aio_context_release(aio_context
);
1337 /* New and old BlockDriverState structs for atomic group operations */
1339 typedef struct BlkTransactionState BlkTransactionState
;
1341 /* Only prepare() may fail. In a single transaction, only one of commit() or
1342 abort() will be called, clean() will always be called if it present. */
1343 typedef struct BdrvActionOps
{
1344 /* Size of state struct, in bytes. */
1345 size_t instance_size
;
1346 /* Prepare the work, must NOT be NULL. */
1347 void (*prepare
)(BlkTransactionState
*common
, Error
**errp
);
1348 /* Commit the changes, can be NULL. */
1349 void (*commit
)(BlkTransactionState
*common
);
1350 /* Abort the changes on fail, can be NULL. */
1351 void (*abort
)(BlkTransactionState
*common
);
1352 /* Clean up resource in the end, can be NULL. */
1353 void (*clean
)(BlkTransactionState
*common
);
1357 * This structure must be arranged as first member in child type, assuming
1358 * that compiler will also arrange it to the same address with parent instance.
1359 * Later it will be used in free().
1361 struct BlkTransactionState
{
1362 TransactionAction
*action
;
1363 const BdrvActionOps
*ops
;
1364 QSIMPLEQ_ENTRY(BlkTransactionState
) entry
;
1367 /* internal snapshot private data */
1368 typedef struct InternalSnapshotState
{
1369 BlkTransactionState common
;
1370 BlockDriverState
*bs
;
1371 AioContext
*aio_context
;
1372 QEMUSnapshotInfo sn
;
1374 } InternalSnapshotState
;
1376 static void internal_snapshot_prepare(BlkTransactionState
*common
,
1379 Error
*local_err
= NULL
;
1383 BlockDriverState
*bs
;
1384 QEMUSnapshotInfo old_sn
, *sn
;
1387 BlockdevSnapshotInternal
*internal
;
1388 InternalSnapshotState
*state
;
1391 g_assert(common
->action
->kind
==
1392 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
);
1393 internal
= common
->action
->blockdev_snapshot_internal_sync
;
1394 state
= DO_UPCAST(InternalSnapshotState
, common
, common
);
1396 /* 1. parse input */
1397 device
= internal
->device
;
1398 name
= internal
->name
;
1400 /* 2. check for validation */
1401 blk
= blk_by_name(device
);
1403 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1404 "Device '%s' not found", device
);
1408 /* AioContext is released in .clean() */
1409 state
->aio_context
= blk_get_aio_context(blk
);
1410 aio_context_acquire(state
->aio_context
);
1412 if (!blk_is_available(blk
)) {
1413 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1419 bdrv_drained_begin(bs
);
1421 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT
, errp
)) {
1425 if (bdrv_is_read_only(bs
)) {
1426 error_setg(errp
, "Device '%s' is read only", device
);
1430 if (!bdrv_can_snapshot(bs
)) {
1431 error_setg(errp
, "Block format '%s' used by device '%s' "
1432 "does not support internal snapshots",
1433 bs
->drv
->format_name
, device
);
1437 if (!strlen(name
)) {
1438 error_setg(errp
, "Name is empty");
1442 /* check whether a snapshot with name exist */
1443 ret
= bdrv_snapshot_find_by_id_and_name(bs
, NULL
, name
, &old_sn
,
1446 error_propagate(errp
, local_err
);
1450 "Snapshot with name '%s' already exists on device '%s'",
1455 /* 3. take the snapshot */
1457 pstrcpy(sn
->name
, sizeof(sn
->name
), name
);
1458 qemu_gettimeofday(&tv
);
1459 sn
->date_sec
= tv
.tv_sec
;
1460 sn
->date_nsec
= tv
.tv_usec
* 1000;
1461 sn
->vm_clock_nsec
= qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
);
1463 ret1
= bdrv_snapshot_create(bs
, sn
);
1465 error_setg_errno(errp
, -ret1
,
1466 "Failed to create snapshot '%s' on device '%s'",
1471 /* 4. succeed, mark a snapshot is created */
1472 state
->created
= true;
1475 static void internal_snapshot_abort(BlkTransactionState
*common
)
1477 InternalSnapshotState
*state
=
1478 DO_UPCAST(InternalSnapshotState
, common
, common
);
1479 BlockDriverState
*bs
= state
->bs
;
1480 QEMUSnapshotInfo
*sn
= &state
->sn
;
1481 Error
*local_error
= NULL
;
1483 if (!state
->created
) {
1487 if (bdrv_snapshot_delete(bs
, sn
->id_str
, sn
->name
, &local_error
) < 0) {
1488 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1489 "device '%s' in abort: %s",
1492 bdrv_get_device_name(bs
),
1493 error_get_pretty(local_error
));
1494 error_free(local_error
);
1498 static void internal_snapshot_clean(BlkTransactionState
*common
)
1500 InternalSnapshotState
*state
= DO_UPCAST(InternalSnapshotState
,
1503 if (state
->aio_context
) {
1505 bdrv_drained_end(state
->bs
);
1507 aio_context_release(state
->aio_context
);
1511 /* external snapshot private data */
1512 typedef struct ExternalSnapshotState
{
1513 BlkTransactionState common
;
1514 BlockDriverState
*old_bs
;
1515 BlockDriverState
*new_bs
;
1516 AioContext
*aio_context
;
1517 } ExternalSnapshotState
;
1519 static void external_snapshot_prepare(BlkTransactionState
*common
,
1524 Error
*local_err
= NULL
;
1525 bool has_device
= false;
1527 bool has_node_name
= false;
1528 const char *node_name
;
1529 bool has_snapshot_node_name
= false;
1530 const char *snapshot_node_name
;
1531 const char *new_image_file
;
1532 const char *format
= "qcow2";
1533 enum NewImageMode mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
1534 ExternalSnapshotState
*state
=
1535 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1536 TransactionAction
*action
= common
->action
;
1538 /* get parameters */
1539 g_assert(action
->kind
== TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
);
1541 has_device
= action
->blockdev_snapshot_sync
->has_device
;
1542 device
= action
->blockdev_snapshot_sync
->device
;
1543 has_node_name
= action
->blockdev_snapshot_sync
->has_node_name
;
1544 node_name
= action
->blockdev_snapshot_sync
->node_name
;
1545 has_snapshot_node_name
=
1546 action
->blockdev_snapshot_sync
->has_snapshot_node_name
;
1547 snapshot_node_name
= action
->blockdev_snapshot_sync
->snapshot_node_name
;
1549 new_image_file
= action
->blockdev_snapshot_sync
->snapshot_file
;
1550 if (action
->blockdev_snapshot_sync
->has_format
) {
1551 format
= action
->blockdev_snapshot_sync
->format
;
1553 if (action
->blockdev_snapshot_sync
->has_mode
) {
1554 mode
= action
->blockdev_snapshot_sync
->mode
;
1557 /* start processing */
1558 state
->old_bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
1559 has_node_name
? node_name
: NULL
,
1562 error_propagate(errp
, local_err
);
1566 if (has_node_name
&& !has_snapshot_node_name
) {
1567 error_setg(errp
, "New snapshot node name missing");
1571 if (has_snapshot_node_name
&& bdrv_find_node(snapshot_node_name
)) {
1572 error_setg(errp
, "New snapshot node name already existing");
1576 /* Acquire AioContext now so any threads operating on old_bs stop */
1577 state
->aio_context
= bdrv_get_aio_context(state
->old_bs
);
1578 aio_context_acquire(state
->aio_context
);
1579 bdrv_drained_begin(state
->old_bs
);
1581 if (!bdrv_is_inserted(state
->old_bs
)) {
1582 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1586 if (bdrv_op_is_blocked(state
->old_bs
,
1587 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
, errp
)) {
1591 if (!bdrv_is_read_only(state
->old_bs
)) {
1592 if (bdrv_flush(state
->old_bs
)) {
1593 error_setg(errp
, QERR_IO_ERROR
);
1598 if (!bdrv_is_first_non_filter(state
->old_bs
)) {
1599 error_setg(errp
, QERR_FEATURE_DISABLED
, "snapshot");
1603 flags
= state
->old_bs
->open_flags
;
1605 /* create new image w/backing file */
1606 if (mode
!= NEW_IMAGE_MODE_EXISTING
) {
1607 bdrv_img_create(new_image_file
, format
,
1608 state
->old_bs
->filename
,
1609 state
->old_bs
->drv
->format_name
,
1610 NULL
, -1, flags
, &local_err
, false);
1612 error_propagate(errp
, local_err
);
1617 options
= qdict_new();
1618 if (has_snapshot_node_name
) {
1619 qdict_put(options
, "node-name",
1620 qstring_from_str(snapshot_node_name
));
1622 qdict_put(options
, "driver", qstring_from_str(format
));
1624 /* TODO Inherit bs->options or only take explicit options with an
1625 * extended QMP command? */
1626 assert(state
->new_bs
== NULL
);
1627 ret
= bdrv_open(&state
->new_bs
, new_image_file
, NULL
, options
,
1628 flags
| BDRV_O_NO_BACKING
, &local_err
);
1629 /* We will manually add the backing_hd field to the bs later */
1631 error_propagate(errp
, local_err
);
1635 static void external_snapshot_commit(BlkTransactionState
*common
)
1637 ExternalSnapshotState
*state
=
1638 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1640 bdrv_set_aio_context(state
->new_bs
, state
->aio_context
);
1642 /* This removes our old bs and adds the new bs */
1643 bdrv_append(state
->new_bs
, state
->old_bs
);
1644 /* We don't need (or want) to use the transactional
1645 * bdrv_reopen_multiple() across all the entries at once, because we
1646 * don't want to abort all of them if one of them fails the reopen */
1647 bdrv_reopen(state
->old_bs
, state
->old_bs
->open_flags
& ~BDRV_O_RDWR
,
1651 static void external_snapshot_abort(BlkTransactionState
*common
)
1653 ExternalSnapshotState
*state
=
1654 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1655 if (state
->new_bs
) {
1656 bdrv_unref(state
->new_bs
);
1660 static void external_snapshot_clean(BlkTransactionState
*common
)
1662 ExternalSnapshotState
*state
=
1663 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1664 if (state
->aio_context
) {
1665 bdrv_drained_end(state
->old_bs
);
1666 aio_context_release(state
->aio_context
);
1670 typedef struct DriveBackupState
{
1671 BlkTransactionState common
;
1672 BlockDriverState
*bs
;
1673 AioContext
*aio_context
;
1677 static void drive_backup_prepare(BlkTransactionState
*common
, Error
**errp
)
1679 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1681 DriveBackup
*backup
;
1682 Error
*local_err
= NULL
;
1684 assert(common
->action
->kind
== TRANSACTION_ACTION_KIND_DRIVE_BACKUP
);
1685 backup
= common
->action
->drive_backup
;
1687 blk
= blk_by_name(backup
->device
);
1689 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1690 "Device '%s' not found", backup
->device
);
1694 if (!blk_is_available(blk
)) {
1695 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, backup
->device
);
1699 /* AioContext is released in .clean() */
1700 state
->aio_context
= blk_get_aio_context(blk
);
1701 aio_context_acquire(state
->aio_context
);
1702 bdrv_drained_begin(blk_bs(blk
));
1703 state
->bs
= blk_bs(blk
);
1705 qmp_drive_backup(backup
->device
, backup
->target
,
1706 backup
->has_format
, backup
->format
,
1708 backup
->has_mode
, backup
->mode
,
1709 backup
->has_speed
, backup
->speed
,
1710 backup
->has_bitmap
, backup
->bitmap
,
1711 backup
->has_on_source_error
, backup
->on_source_error
,
1712 backup
->has_on_target_error
, backup
->on_target_error
,
1715 error_propagate(errp
, local_err
);
1719 state
->job
= state
->bs
->job
;
1722 static void drive_backup_abort(BlkTransactionState
*common
)
1724 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1725 BlockDriverState
*bs
= state
->bs
;
1727 /* Only cancel if it's the job we started */
1728 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
1729 block_job_cancel_sync(bs
->job
);
1733 static void drive_backup_clean(BlkTransactionState
*common
)
1735 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1737 if (state
->aio_context
) {
1738 bdrv_drained_end(state
->bs
);
1739 aio_context_release(state
->aio_context
);
1743 typedef struct BlockdevBackupState
{
1744 BlkTransactionState common
;
1745 BlockDriverState
*bs
;
1747 AioContext
*aio_context
;
1748 } BlockdevBackupState
;
1750 static void blockdev_backup_prepare(BlkTransactionState
*common
, Error
**errp
)
1752 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1753 BlockdevBackup
*backup
;
1754 BlockBackend
*blk
, *target
;
1755 Error
*local_err
= NULL
;
1757 assert(common
->action
->kind
== TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP
);
1758 backup
= common
->action
->blockdev_backup
;
1760 blk
= blk_by_name(backup
->device
);
1762 error_setg(errp
, "Device '%s' not found", backup
->device
);
1766 if (!blk_is_available(blk
)) {
1767 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, backup
->device
);
1771 target
= blk_by_name(backup
->target
);
1773 error_setg(errp
, "Device '%s' not found", backup
->target
);
1777 /* AioContext is released in .clean() */
1778 state
->aio_context
= blk_get_aio_context(blk
);
1779 if (state
->aio_context
!= blk_get_aio_context(target
)) {
1780 state
->aio_context
= NULL
;
1781 error_setg(errp
, "Backup between two IO threads is not implemented");
1784 aio_context_acquire(state
->aio_context
);
1785 state
->bs
= blk_bs(blk
);
1786 bdrv_drained_begin(state
->bs
);
1788 qmp_blockdev_backup(backup
->device
, backup
->target
,
1790 backup
->has_speed
, backup
->speed
,
1791 backup
->has_on_source_error
, backup
->on_source_error
,
1792 backup
->has_on_target_error
, backup
->on_target_error
,
1795 error_propagate(errp
, local_err
);
1799 state
->job
= state
->bs
->job
;
1802 static void blockdev_backup_abort(BlkTransactionState
*common
)
1804 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1805 BlockDriverState
*bs
= state
->bs
;
1807 /* Only cancel if it's the job we started */
1808 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
1809 block_job_cancel_sync(bs
->job
);
1813 static void blockdev_backup_clean(BlkTransactionState
*common
)
1815 BlockdevBackupState
*state
= DO_UPCAST(BlockdevBackupState
, common
, common
);
1817 if (state
->aio_context
) {
1818 bdrv_drained_end(state
->bs
);
1819 aio_context_release(state
->aio_context
);
1823 static void abort_prepare(BlkTransactionState
*common
, Error
**errp
)
1825 error_setg(errp
, "Transaction aborted using Abort action");
1828 static void abort_commit(BlkTransactionState
*common
)
1830 g_assert_not_reached(); /* this action never succeeds */
1833 static const BdrvActionOps actions
[] = {
1834 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
] = {
1835 .instance_size
= sizeof(ExternalSnapshotState
),
1836 .prepare
= external_snapshot_prepare
,
1837 .commit
= external_snapshot_commit
,
1838 .abort
= external_snapshot_abort
,
1839 .clean
= external_snapshot_clean
,
1841 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP
] = {
1842 .instance_size
= sizeof(DriveBackupState
),
1843 .prepare
= drive_backup_prepare
,
1844 .abort
= drive_backup_abort
,
1845 .clean
= drive_backup_clean
,
1847 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP
] = {
1848 .instance_size
= sizeof(BlockdevBackupState
),
1849 .prepare
= blockdev_backup_prepare
,
1850 .abort
= blockdev_backup_abort
,
1851 .clean
= blockdev_backup_clean
,
1853 [TRANSACTION_ACTION_KIND_ABORT
] = {
1854 .instance_size
= sizeof(BlkTransactionState
),
1855 .prepare
= abort_prepare
,
1856 .commit
= abort_commit
,
1858 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
] = {
1859 .instance_size
= sizeof(InternalSnapshotState
),
1860 .prepare
= internal_snapshot_prepare
,
1861 .abort
= internal_snapshot_abort
,
1862 .clean
= internal_snapshot_clean
,
1867 * 'Atomic' group operations. The operations are performed as a set, and if
1868 * any fail then we roll back all operations in the group.
1870 void qmp_transaction(TransactionActionList
*dev_list
, Error
**errp
)
1872 TransactionActionList
*dev_entry
= dev_list
;
1873 BlkTransactionState
*state
, *next
;
1874 Error
*local_err
= NULL
;
1876 QSIMPLEQ_HEAD(snap_bdrv_states
, BlkTransactionState
) snap_bdrv_states
;
1877 QSIMPLEQ_INIT(&snap_bdrv_states
);
1879 /* drain all i/o before any operations */
1882 /* We don't do anything in this loop that commits us to the operations */
1883 while (NULL
!= dev_entry
) {
1884 TransactionAction
*dev_info
= NULL
;
1885 const BdrvActionOps
*ops
;
1887 dev_info
= dev_entry
->value
;
1888 dev_entry
= dev_entry
->next
;
1890 assert(dev_info
->kind
< ARRAY_SIZE(actions
));
1892 ops
= &actions
[dev_info
->kind
];
1893 assert(ops
->instance_size
> 0);
1895 state
= g_malloc0(ops
->instance_size
);
1897 state
->action
= dev_info
;
1898 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states
, state
, entry
);
1900 state
->ops
->prepare(state
, &local_err
);
1902 error_propagate(errp
, local_err
);
1903 goto delete_and_fail
;
1907 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
1908 if (state
->ops
->commit
) {
1909 state
->ops
->commit(state
);
1917 /* failure, and it is all-or-none; roll back all operations */
1918 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
1919 if (state
->ops
->abort
) {
1920 state
->ops
->abort(state
);
1924 QSIMPLEQ_FOREACH_SAFE(state
, &snap_bdrv_states
, entry
, next
) {
1925 if (state
->ops
->clean
) {
1926 state
->ops
->clean(state
);
1933 static void eject_device(BlockBackend
*blk
, int force
, Error
**errp
)
1935 BlockDriverState
*bs
= blk_bs(blk
);
1936 AioContext
*aio_context
;
1939 /* No medium inserted, so there is nothing to do */
1943 aio_context
= bdrv_get_aio_context(bs
);
1944 aio_context_acquire(aio_context
);
1946 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_EJECT
, errp
)) {
1949 if (!blk_dev_has_removable_media(blk
)) {
1950 error_setg(errp
, "Device '%s' is not removable",
1951 bdrv_get_device_name(bs
));
1955 if (blk_dev_is_medium_locked(blk
) && !blk_dev_is_tray_open(blk
)) {
1956 blk_dev_eject_request(blk
, force
);
1958 error_setg(errp
, "Device '%s' is locked",
1959 bdrv_get_device_name(bs
));
1967 aio_context_release(aio_context
);
1970 void qmp_eject(const char *device
, bool has_force
, bool force
, Error
**errp
)
1974 blk
= blk_by_name(device
);
1976 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
1977 "Device '%s' not found", device
);
1981 eject_device(blk
, force
, errp
);
1984 void qmp_block_passwd(bool has_device
, const char *device
,
1985 bool has_node_name
, const char *node_name
,
1986 const char *password
, Error
**errp
)
1988 Error
*local_err
= NULL
;
1989 BlockDriverState
*bs
;
1990 AioContext
*aio_context
;
1992 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
1993 has_node_name
? node_name
: NULL
,
1996 error_propagate(errp
, local_err
);
2000 aio_context
= bdrv_get_aio_context(bs
);
2001 aio_context_acquire(aio_context
);
2003 bdrv_add_key(bs
, password
, errp
);
2005 aio_context_release(aio_context
);
2008 /* Assumes AioContext is held */
2009 static void qmp_bdrv_open_encrypted(BlockDriverState
**pbs
,
2010 const char *filename
,
2011 int bdrv_flags
, const char *format
,
2012 const char *password
, Error
**errp
)
2014 Error
*local_err
= NULL
;
2015 QDict
*options
= NULL
;
2019 options
= qdict_new();
2020 qdict_put(options
, "driver", qstring_from_str(format
));
2023 ret
= bdrv_open(pbs
, filename
, NULL
, options
, bdrv_flags
, &local_err
);
2025 error_propagate(errp
, local_err
);
2029 bdrv_add_key(*pbs
, password
, errp
);
2032 void qmp_change_blockdev(const char *device
, const char *filename
,
2033 const char *format
, Error
**errp
)
2036 BlockDriverState
*bs
;
2037 AioContext
*aio_context
;
2042 blk
= blk_by_name(device
);
2044 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2045 "Device '%s' not found", device
);
2051 aio_context
= blk_get_aio_context(blk
);
2052 aio_context_acquire(aio_context
);
2054 eject_device(blk
, 0, &err
);
2056 error_propagate(errp
, err
);
2060 bdrv_flags
= blk_is_read_only(blk
) ? 0 : BDRV_O_RDWR
;
2061 bdrv_flags
|= blk_get_root_state(blk
)->open_flags
& ~BDRV_O_RDWR
;
2063 qmp_bdrv_open_encrypted(&bs
, filename
, bdrv_flags
, format
, NULL
, &err
);
2065 error_propagate(errp
, err
);
2070 blk_insert_bs(blk
, bs
);
2071 /* Has been sent automatically by bdrv_open() if blk_bs(blk) was not
2073 blk_dev_change_media_cb(blk
, true);
2077 aio_context_release(aio_context
);
2080 /* throttling disk I/O limits */
2081 void qmp_block_set_io_throttle(const char *device
, int64_t bps
, int64_t bps_rd
,
2088 bool has_bps_rd_max
,
2090 bool has_bps_wr_max
,
2094 bool has_iops_rd_max
,
2095 int64_t iops_rd_max
,
2096 bool has_iops_wr_max
,
2097 int64_t iops_wr_max
,
2101 const char *group
, Error
**errp
)
2104 BlockDriverState
*bs
;
2106 AioContext
*aio_context
;
2108 blk
= blk_by_name(device
);
2110 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2111 "Device '%s' not found", device
);
2115 aio_context
= blk_get_aio_context(blk
);
2116 aio_context_acquire(aio_context
);
2120 error_setg(errp
, "Device '%s' has no medium", device
);
2124 memset(&cfg
, 0, sizeof(cfg
));
2125 cfg
.buckets
[THROTTLE_BPS_TOTAL
].avg
= bps
;
2126 cfg
.buckets
[THROTTLE_BPS_READ
].avg
= bps_rd
;
2127 cfg
.buckets
[THROTTLE_BPS_WRITE
].avg
= bps_wr
;
2129 cfg
.buckets
[THROTTLE_OPS_TOTAL
].avg
= iops
;
2130 cfg
.buckets
[THROTTLE_OPS_READ
].avg
= iops_rd
;
2131 cfg
.buckets
[THROTTLE_OPS_WRITE
].avg
= iops_wr
;
2134 cfg
.buckets
[THROTTLE_BPS_TOTAL
].max
= bps_max
;
2136 if (has_bps_rd_max
) {
2137 cfg
.buckets
[THROTTLE_BPS_READ
].max
= bps_rd_max
;
2139 if (has_bps_wr_max
) {
2140 cfg
.buckets
[THROTTLE_BPS_WRITE
].max
= bps_wr_max
;
2143 cfg
.buckets
[THROTTLE_OPS_TOTAL
].max
= iops_max
;
2145 if (has_iops_rd_max
) {
2146 cfg
.buckets
[THROTTLE_OPS_READ
].max
= iops_rd_max
;
2148 if (has_iops_wr_max
) {
2149 cfg
.buckets
[THROTTLE_OPS_WRITE
].max
= iops_wr_max
;
2152 if (has_iops_size
) {
2153 cfg
.op_size
= iops_size
;
2156 if (!check_throttle_config(&cfg
, errp
)) {
2160 if (throttle_enabled(&cfg
)) {
2161 /* Enable I/O limits if they're not enabled yet, otherwise
2162 * just update the throttling group. */
2163 if (!bs
->io_limits_enabled
) {
2164 bdrv_io_limits_enable(bs
, has_group
? group
: device
);
2165 } else if (has_group
) {
2166 bdrv_io_limits_update_group(bs
, group
);
2168 /* Set the new throttling configuration */
2169 bdrv_set_io_limits(bs
, &cfg
);
2170 } else if (bs
->io_limits_enabled
) {
2171 /* If all throttling settings are set to 0, disable I/O limits */
2172 bdrv_io_limits_disable(bs
);
2176 aio_context_release(aio_context
);
2179 void qmp_block_dirty_bitmap_add(const char *node
, const char *name
,
2180 bool has_granularity
, uint32_t granularity
,
2183 AioContext
*aio_context
;
2184 BlockDriverState
*bs
;
2186 if (!name
|| name
[0] == '\0') {
2187 error_setg(errp
, "Bitmap name cannot be empty");
2191 bs
= bdrv_lookup_bs(node
, node
, errp
);
2196 aio_context
= bdrv_get_aio_context(bs
);
2197 aio_context_acquire(aio_context
);
2199 if (has_granularity
) {
2200 if (granularity
< 512 || !is_power_of_2(granularity
)) {
2201 error_setg(errp
, "Granularity must be power of 2 "
2202 "and at least 512");
2206 /* Default to cluster size, if available: */
2207 granularity
= bdrv_get_default_bitmap_granularity(bs
);
2210 bdrv_create_dirty_bitmap(bs
, granularity
, name
, errp
);
2213 aio_context_release(aio_context
);
2216 void qmp_block_dirty_bitmap_remove(const char *node
, const char *name
,
2219 AioContext
*aio_context
;
2220 BlockDriverState
*bs
;
2221 BdrvDirtyBitmap
*bitmap
;
2223 bitmap
= block_dirty_bitmap_lookup(node
, name
, &bs
, &aio_context
, errp
);
2224 if (!bitmap
|| !bs
) {
2228 if (bdrv_dirty_bitmap_frozen(bitmap
)) {
2230 "Bitmap '%s' is currently frozen and cannot be removed",
2234 bdrv_dirty_bitmap_make_anon(bitmap
);
2235 bdrv_release_dirty_bitmap(bs
, bitmap
);
2238 aio_context_release(aio_context
);
2242 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2243 * immediately after a full backup operation.
2245 void qmp_block_dirty_bitmap_clear(const char *node
, const char *name
,
2248 AioContext
*aio_context
;
2249 BdrvDirtyBitmap
*bitmap
;
2250 BlockDriverState
*bs
;
2252 bitmap
= block_dirty_bitmap_lookup(node
, name
, &bs
, &aio_context
, errp
);
2253 if (!bitmap
|| !bs
) {
2257 if (bdrv_dirty_bitmap_frozen(bitmap
)) {
2259 "Bitmap '%s' is currently frozen and cannot be modified",
2262 } else if (!bdrv_dirty_bitmap_enabled(bitmap
)) {
2264 "Bitmap '%s' is currently disabled and cannot be cleared",
2269 bdrv_clear_dirty_bitmap(bitmap
);
2272 aio_context_release(aio_context
);
2275 void hmp_drive_del(Monitor
*mon
, const QDict
*qdict
)
2277 const char *id
= qdict_get_str(qdict
, "id");
2279 BlockDriverState
*bs
;
2280 AioContext
*aio_context
;
2281 Error
*local_err
= NULL
;
2283 blk
= blk_by_name(id
);
2285 error_report("Device '%s' not found", id
);
2289 if (!blk_legacy_dinfo(blk
)) {
2290 error_report("Deleting device added with blockdev-add"
2291 " is not supported");
2295 aio_context
= blk_get_aio_context(blk
);
2296 aio_context_acquire(aio_context
);
2300 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_DRIVE_DEL
, &local_err
)) {
2301 error_report_err(local_err
);
2302 aio_context_release(aio_context
);
2309 /* if we have a device attached to this BlockDriverState
2310 * then we need to make the drive anonymous until the device
2311 * can be removed. If this is a drive with no device backing
2312 * then we can just get rid of the block driver state right here.
2314 if (blk_get_attached_dev(blk
)) {
2315 blk_hide_on_behalf_of_hmp_drive_del(blk
);
2316 /* Further I/O must not pause the guest */
2317 blk_set_on_error(blk
, BLOCKDEV_ON_ERROR_REPORT
,
2318 BLOCKDEV_ON_ERROR_REPORT
);
2323 aio_context_release(aio_context
);
2326 void qmp_block_resize(bool has_device
, const char *device
,
2327 bool has_node_name
, const char *node_name
,
2328 int64_t size
, Error
**errp
)
2330 Error
*local_err
= NULL
;
2331 BlockDriverState
*bs
;
2332 AioContext
*aio_context
;
2335 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
2336 has_node_name
? node_name
: NULL
,
2339 error_propagate(errp
, local_err
);
2343 aio_context
= bdrv_get_aio_context(bs
);
2344 aio_context_acquire(aio_context
);
2346 if (!bdrv_is_first_non_filter(bs
)) {
2347 error_setg(errp
, QERR_FEATURE_DISABLED
, "resize");
2352 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "size", "a >0 size");
2356 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_RESIZE
, NULL
)) {
2357 error_setg(errp
, QERR_DEVICE_IN_USE
, device
);
2361 /* complete all in-flight operations before resizing the device */
2364 ret
= bdrv_truncate(bs
, size
);
2369 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
2372 error_setg(errp
, QERR_UNSUPPORTED
);
2375 error_setg(errp
, "Device '%s' is read only", device
);
2378 error_setg(errp
, QERR_DEVICE_IN_USE
, device
);
2381 error_setg_errno(errp
, -ret
, "Could not resize");
2386 aio_context_release(aio_context
);
2389 static void block_job_cb(void *opaque
, int ret
)
2391 /* Note that this function may be executed from another AioContext besides
2392 * the QEMU main loop. If you need to access anything that assumes the
2393 * QEMU global mutex, use a BH or introduce a mutex.
2396 BlockDriverState
*bs
= opaque
;
2397 const char *msg
= NULL
;
2399 trace_block_job_cb(bs
, bs
->job
, ret
);
2404 msg
= strerror(-ret
);
2407 if (block_job_is_cancelled(bs
->job
)) {
2408 block_job_event_cancelled(bs
->job
);
2410 block_job_event_completed(bs
->job
, msg
);
2413 bdrv_put_ref_bh_schedule(bs
);
2416 void qmp_block_stream(const char *device
,
2417 bool has_base
, const char *base
,
2418 bool has_backing_file
, const char *backing_file
,
2419 bool has_speed
, int64_t speed
,
2420 bool has_on_error
, BlockdevOnError on_error
,
2424 BlockDriverState
*bs
;
2425 BlockDriverState
*base_bs
= NULL
;
2426 AioContext
*aio_context
;
2427 Error
*local_err
= NULL
;
2428 const char *base_name
= NULL
;
2430 if (!has_on_error
) {
2431 on_error
= BLOCKDEV_ON_ERROR_REPORT
;
2434 blk
= blk_by_name(device
);
2436 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2437 "Device '%s' not found", device
);
2441 aio_context
= blk_get_aio_context(blk
);
2442 aio_context_acquire(aio_context
);
2444 if (!blk_is_available(blk
)) {
2445 error_setg(errp
, "Device '%s' has no medium", device
);
2450 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_STREAM
, errp
)) {
2455 base_bs
= bdrv_find_backing_image(bs
, base
);
2456 if (base_bs
== NULL
) {
2457 error_setg(errp
, QERR_BASE_NOT_FOUND
, base
);
2460 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
2464 /* if we are streaming the entire chain, the result will have no backing
2465 * file, and specifying one is therefore an error */
2466 if (base_bs
== NULL
&& has_backing_file
) {
2467 error_setg(errp
, "backing file specified, but streaming the "
2472 /* backing_file string overrides base bs filename */
2473 base_name
= has_backing_file
? backing_file
: base_name
;
2475 stream_start(bs
, base_bs
, base_name
, has_speed
? speed
: 0,
2476 on_error
, block_job_cb
, bs
, &local_err
);
2478 error_propagate(errp
, local_err
);
2482 trace_qmp_block_stream(bs
, bs
->job
);
2485 aio_context_release(aio_context
);
2488 void qmp_block_commit(const char *device
,
2489 bool has_base
, const char *base
,
2490 bool has_top
, const char *top
,
2491 bool has_backing_file
, const char *backing_file
,
2492 bool has_speed
, int64_t speed
,
2496 BlockDriverState
*bs
;
2497 BlockDriverState
*base_bs
, *top_bs
;
2498 AioContext
*aio_context
;
2499 Error
*local_err
= NULL
;
2500 /* This will be part of the QMP command, if/when the
2501 * BlockdevOnError change for blkmirror makes it in
2503 BlockdevOnError on_error
= BLOCKDEV_ON_ERROR_REPORT
;
2510 * libvirt relies on the DeviceNotFound error class in order to probe for
2511 * live commit feature versions; for this to work, we must make sure to
2512 * perform the device lookup before any generic errors that may occur in a
2513 * scenario in which all optional arguments are omitted. */
2514 blk
= blk_by_name(device
);
2516 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2517 "Device '%s' not found", device
);
2521 aio_context
= blk_get_aio_context(blk
);
2522 aio_context_acquire(aio_context
);
2524 if (!blk_is_available(blk
)) {
2525 error_setg(errp
, "Device '%s' has no medium", device
);
2530 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_COMMIT_SOURCE
, errp
)) {
2534 /* default top_bs is the active layer */
2537 if (has_top
&& top
) {
2538 if (strcmp(bs
->filename
, top
) != 0) {
2539 top_bs
= bdrv_find_backing_image(bs
, top
);
2543 if (top_bs
== NULL
) {
2544 error_setg(errp
, "Top image file %s not found", top
? top
: "NULL");
2548 assert(bdrv_get_aio_context(top_bs
) == aio_context
);
2550 if (has_base
&& base
) {
2551 base_bs
= bdrv_find_backing_image(top_bs
, base
);
2553 base_bs
= bdrv_find_base(top_bs
);
2556 if (base_bs
== NULL
) {
2557 error_setg(errp
, QERR_BASE_NOT_FOUND
, base
? base
: "NULL");
2561 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
2563 if (bdrv_op_is_blocked(base_bs
, BLOCK_OP_TYPE_COMMIT_TARGET
, errp
)) {
2567 /* Do not allow attempts to commit an image into itself */
2568 if (top_bs
== base_bs
) {
2569 error_setg(errp
, "cannot commit an image into itself");
2574 if (has_backing_file
) {
2575 error_setg(errp
, "'backing-file' specified,"
2576 " but 'top' is the active layer");
2579 commit_active_start(bs
, base_bs
, speed
, on_error
, block_job_cb
,
2582 commit_start(bs
, base_bs
, top_bs
, speed
, on_error
, block_job_cb
, bs
,
2583 has_backing_file
? backing_file
: NULL
, &local_err
);
2585 if (local_err
!= NULL
) {
2586 error_propagate(errp
, local_err
);
2591 aio_context_release(aio_context
);
2594 void qmp_drive_backup(const char *device
, const char *target
,
2595 bool has_format
, const char *format
,
2596 enum MirrorSyncMode sync
,
2597 bool has_mode
, enum NewImageMode mode
,
2598 bool has_speed
, int64_t speed
,
2599 bool has_bitmap
, const char *bitmap
,
2600 bool has_on_source_error
, BlockdevOnError on_source_error
,
2601 bool has_on_target_error
, BlockdevOnError on_target_error
,
2605 BlockDriverState
*bs
;
2606 BlockDriverState
*target_bs
;
2607 BlockDriverState
*source
= NULL
;
2608 BdrvDirtyBitmap
*bmap
= NULL
;
2609 AioContext
*aio_context
;
2610 QDict
*options
= NULL
;
2611 Error
*local_err
= NULL
;
2619 if (!has_on_source_error
) {
2620 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
2622 if (!has_on_target_error
) {
2623 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
2626 mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
2629 blk
= blk_by_name(device
);
2631 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2632 "Device '%s' not found", device
);
2636 aio_context
= blk_get_aio_context(blk
);
2637 aio_context_acquire(aio_context
);
2639 /* Although backup_run has this check too, we need to use bs->drv below, so
2640 * do an early check redundantly. */
2641 if (!blk_is_available(blk
)) {
2642 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
2648 format
= mode
== NEW_IMAGE_MODE_EXISTING
? NULL
: bs
->drv
->format_name
;
2651 /* Early check to avoid creating target */
2652 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_BACKUP_SOURCE
, errp
)) {
2656 flags
= bs
->open_flags
| BDRV_O_RDWR
;
2658 /* See if we have a backing HD we can use to create our new image
2660 if (sync
== MIRROR_SYNC_MODE_TOP
) {
2661 source
= backing_bs(bs
);
2663 sync
= MIRROR_SYNC_MODE_FULL
;
2666 if (sync
== MIRROR_SYNC_MODE_NONE
) {
2670 size
= bdrv_getlength(bs
);
2672 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
2676 if (mode
!= NEW_IMAGE_MODE_EXISTING
) {
2679 bdrv_img_create(target
, format
, source
->filename
,
2680 source
->drv
->format_name
, NULL
,
2681 size
, flags
, &local_err
, false);
2683 bdrv_img_create(target
, format
, NULL
, NULL
, NULL
,
2684 size
, flags
, &local_err
, false);
2689 error_propagate(errp
, local_err
);
2694 options
= qdict_new();
2695 qdict_put(options
, "driver", qstring_from_str(format
));
2699 ret
= bdrv_open(&target_bs
, target
, NULL
, options
, flags
, &local_err
);
2701 error_propagate(errp
, local_err
);
2705 bdrv_set_aio_context(target_bs
, aio_context
);
2708 bmap
= bdrv_find_dirty_bitmap(bs
, bitmap
);
2710 error_setg(errp
, "Bitmap '%s' could not be found", bitmap
);
2715 backup_start(bs
, target_bs
, speed
, sync
, bmap
,
2716 on_source_error
, on_target_error
,
2717 block_job_cb
, bs
, &local_err
);
2718 if (local_err
!= NULL
) {
2719 bdrv_unref(target_bs
);
2720 error_propagate(errp
, local_err
);
2725 aio_context_release(aio_context
);
2728 BlockDeviceInfoList
*qmp_query_named_block_nodes(Error
**errp
)
2730 return bdrv_named_nodes_list(errp
);
2733 void qmp_blockdev_backup(const char *device
, const char *target
,
2734 enum MirrorSyncMode sync
,
2735 bool has_speed
, int64_t speed
,
2736 bool has_on_source_error
,
2737 BlockdevOnError on_source_error
,
2738 bool has_on_target_error
,
2739 BlockdevOnError on_target_error
,
2742 BlockBackend
*blk
, *target_blk
;
2743 BlockDriverState
*bs
;
2744 BlockDriverState
*target_bs
;
2745 Error
*local_err
= NULL
;
2746 AioContext
*aio_context
;
2751 if (!has_on_source_error
) {
2752 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
2754 if (!has_on_target_error
) {
2755 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
2758 blk
= blk_by_name(device
);
2760 error_setg(errp
, "Device '%s' not found", device
);
2764 aio_context
= blk_get_aio_context(blk
);
2765 aio_context_acquire(aio_context
);
2767 if (!blk_is_available(blk
)) {
2768 error_setg(errp
, "Device '%s' has no medium", device
);
2773 target_blk
= blk_by_name(target
);
2775 error_setg(errp
, "Device '%s' not found", target
);
2779 if (!blk_is_available(target_blk
)) {
2780 error_setg(errp
, "Device '%s' has no medium", target
);
2783 target_bs
= blk_bs(target_blk
);
2785 bdrv_ref(target_bs
);
2786 bdrv_set_aio_context(target_bs
, aio_context
);
2787 backup_start(bs
, target_bs
, speed
, sync
, NULL
, on_source_error
,
2788 on_target_error
, block_job_cb
, bs
, &local_err
);
2789 if (local_err
!= NULL
) {
2790 bdrv_unref(target_bs
);
2791 error_propagate(errp
, local_err
);
2794 aio_context_release(aio_context
);
2797 void qmp_drive_mirror(const char *device
, const char *target
,
2798 bool has_format
, const char *format
,
2799 bool has_node_name
, const char *node_name
,
2800 bool has_replaces
, const char *replaces
,
2801 enum MirrorSyncMode sync
,
2802 bool has_mode
, enum NewImageMode mode
,
2803 bool has_speed
, int64_t speed
,
2804 bool has_granularity
, uint32_t granularity
,
2805 bool has_buf_size
, int64_t buf_size
,
2806 bool has_on_source_error
, BlockdevOnError on_source_error
,
2807 bool has_on_target_error
, BlockdevOnError on_target_error
,
2808 bool has_unmap
, bool unmap
,
2812 BlockDriverState
*bs
;
2813 BlockDriverState
*source
, *target_bs
;
2814 AioContext
*aio_context
;
2815 Error
*local_err
= NULL
;
2824 if (!has_on_source_error
) {
2825 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
2827 if (!has_on_target_error
) {
2828 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
2831 mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
2833 if (!has_granularity
) {
2836 if (!has_buf_size
) {
2843 if (granularity
!= 0 && (granularity
< 512 || granularity
> 1048576 * 64)) {
2844 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
2845 "a value in range [512B, 64MB]");
2848 if (granularity
& (granularity
- 1)) {
2849 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
2854 blk
= blk_by_name(device
);
2856 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
2857 "Device '%s' not found", device
);
2861 aio_context
= blk_get_aio_context(blk
);
2862 aio_context_acquire(aio_context
);
2864 if (!blk_is_available(blk
)) {
2865 error_setg(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
2871 format
= mode
== NEW_IMAGE_MODE_EXISTING
? NULL
: bs
->drv
->format_name
;
2874 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_MIRROR
, errp
)) {
2878 flags
= bs
->open_flags
| BDRV_O_RDWR
;
2879 source
= backing_bs(bs
);
2880 if (!source
&& sync
== MIRROR_SYNC_MODE_TOP
) {
2881 sync
= MIRROR_SYNC_MODE_FULL
;
2883 if (sync
== MIRROR_SYNC_MODE_NONE
) {
2887 size
= bdrv_getlength(bs
);
2889 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
2894 BlockDriverState
*to_replace_bs
;
2895 AioContext
*replace_aio_context
;
2896 int64_t replace_size
;
2898 if (!has_node_name
) {
2899 error_setg(errp
, "a node-name must be provided when replacing a"
2900 " named node of the graph");
2904 to_replace_bs
= check_to_replace_node(bs
, replaces
, &local_err
);
2906 if (!to_replace_bs
) {
2907 error_propagate(errp
, local_err
);
2911 replace_aio_context
= bdrv_get_aio_context(to_replace_bs
);
2912 aio_context_acquire(replace_aio_context
);
2913 replace_size
= bdrv_getlength(to_replace_bs
);
2914 aio_context_release(replace_aio_context
);
2916 if (size
!= replace_size
) {
2917 error_setg(errp
, "cannot replace image with a mirror image of "
2923 if ((sync
== MIRROR_SYNC_MODE_FULL
|| !source
)
2924 && mode
!= NEW_IMAGE_MODE_EXISTING
)
2926 /* create new image w/o backing file */
2928 bdrv_img_create(target
, format
,
2929 NULL
, NULL
, NULL
, size
, flags
, &local_err
, false);
2932 case NEW_IMAGE_MODE_EXISTING
:
2934 case NEW_IMAGE_MODE_ABSOLUTE_PATHS
:
2935 /* create new image with backing file */
2936 bdrv_img_create(target
, format
,
2938 source
->drv
->format_name
,
2939 NULL
, size
, flags
, &local_err
, false);
2947 error_propagate(errp
, local_err
);
2951 options
= qdict_new();
2952 if (has_node_name
) {
2953 qdict_put(options
, "node-name", qstring_from_str(node_name
));
2956 qdict_put(options
, "driver", qstring_from_str(format
));
2959 /* Mirroring takes care of copy-on-write using the source's backing
2963 ret
= bdrv_open(&target_bs
, target
, NULL
, options
,
2964 flags
| BDRV_O_NO_BACKING
, &local_err
);
2966 error_propagate(errp
, local_err
);
2970 bdrv_set_aio_context(target_bs
, aio_context
);
2972 /* pass the node name to replace to mirror start since it's loose coupling
2973 * and will allow to check whether the node still exist at mirror completion
2975 mirror_start(bs
, target_bs
,
2976 has_replaces
? replaces
: NULL
,
2977 speed
, granularity
, buf_size
, sync
,
2978 on_source_error
, on_target_error
,
2980 block_job_cb
, bs
, &local_err
);
2981 if (local_err
!= NULL
) {
2982 bdrv_unref(target_bs
);
2983 error_propagate(errp
, local_err
);
2988 aio_context_release(aio_context
);
2991 /* Get the block job for a given device name and acquire its AioContext */
2992 static BlockJob
*find_block_job(const char *device
, AioContext
**aio_context
,
2996 BlockDriverState
*bs
;
2998 *aio_context
= NULL
;
3000 blk
= blk_by_name(device
);
3005 *aio_context
= blk_get_aio_context(blk
);
3006 aio_context_acquire(*aio_context
);
3008 if (!blk_is_available(blk
)) {
3020 error_set(errp
, ERROR_CLASS_DEVICE_NOT_ACTIVE
,
3021 "No active block job on device '%s'", device
);
3023 aio_context_release(*aio_context
);
3024 *aio_context
= NULL
;
3029 void qmp_block_job_set_speed(const char *device
, int64_t speed
, Error
**errp
)
3031 AioContext
*aio_context
;
3032 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3038 block_job_set_speed(job
, speed
, errp
);
3039 aio_context_release(aio_context
);
3042 void qmp_block_job_cancel(const char *device
,
3043 bool has_force
, bool force
, Error
**errp
)
3045 AioContext
*aio_context
;
3046 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3056 if (job
->user_paused
&& !force
) {
3057 error_setg(errp
, "The block job for device '%s' is currently paused",
3062 trace_qmp_block_job_cancel(job
);
3063 block_job_cancel(job
);
3065 aio_context_release(aio_context
);
3068 void qmp_block_job_pause(const char *device
, Error
**errp
)
3070 AioContext
*aio_context
;
3071 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3073 if (!job
|| job
->user_paused
) {
3077 job
->user_paused
= true;
3078 trace_qmp_block_job_pause(job
);
3079 block_job_pause(job
);
3080 aio_context_release(aio_context
);
3083 void qmp_block_job_resume(const char *device
, Error
**errp
)
3085 AioContext
*aio_context
;
3086 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3088 if (!job
|| !job
->user_paused
) {
3092 job
->user_paused
= false;
3093 trace_qmp_block_job_resume(job
);
3094 block_job_resume(job
);
3095 aio_context_release(aio_context
);
3098 void qmp_block_job_complete(const char *device
, Error
**errp
)
3100 AioContext
*aio_context
;
3101 BlockJob
*job
= find_block_job(device
, &aio_context
, errp
);
3107 trace_qmp_block_job_complete(job
);
3108 block_job_complete(job
, errp
);
3109 aio_context_release(aio_context
);
3112 void qmp_change_backing_file(const char *device
,
3113 const char *image_node_name
,
3114 const char *backing_file
,
3118 BlockDriverState
*bs
= NULL
;
3119 AioContext
*aio_context
;
3120 BlockDriverState
*image_bs
= NULL
;
3121 Error
*local_err
= NULL
;
3126 blk
= blk_by_name(device
);
3128 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
3129 "Device '%s' not found", device
);
3133 aio_context
= blk_get_aio_context(blk
);
3134 aio_context_acquire(aio_context
);
3136 if (!blk_is_available(blk
)) {
3137 error_setg(errp
, "Device '%s' has no medium", device
);
3142 image_bs
= bdrv_lookup_bs(NULL
, image_node_name
, &local_err
);
3144 error_propagate(errp
, local_err
);
3149 error_setg(errp
, "image file not found");
3153 if (bdrv_find_base(image_bs
) == image_bs
) {
3154 error_setg(errp
, "not allowing backing file change on an image "
3155 "without a backing file");
3159 /* even though we are not necessarily operating on bs, we need it to
3160 * determine if block ops are currently prohibited on the chain */
3161 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_CHANGE
, errp
)) {
3165 /* final sanity check */
3166 if (!bdrv_chain_contains(bs
, image_bs
)) {
3167 error_setg(errp
, "'%s' and image file are not in the same chain",
3172 /* if not r/w, reopen to make r/w */
3173 open_flags
= image_bs
->open_flags
;
3174 ro
= bdrv_is_read_only(image_bs
);
3177 bdrv_reopen(image_bs
, open_flags
| BDRV_O_RDWR
, &local_err
);
3179 error_propagate(errp
, local_err
);
3184 ret
= bdrv_change_backing_file(image_bs
, backing_file
,
3185 image_bs
->drv
? image_bs
->drv
->format_name
: "");
3188 error_setg_errno(errp
, -ret
, "Could not change backing file to '%s'",
3190 /* don't exit here, so we can try to restore open flags if
3195 bdrv_reopen(image_bs
, open_flags
, &local_err
);
3197 error_propagate(errp
, local_err
); /* will preserve prior errp */
3202 aio_context_release(aio_context
);
3205 void qmp_blockdev_add(BlockdevOptions
*options
, Error
**errp
)
3207 QmpOutputVisitor
*ov
= qmp_output_visitor_new();
3208 BlockDriverState
*bs
;
3209 BlockBackend
*blk
= NULL
;
3212 Error
*local_err
= NULL
;
3214 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3215 * cache.direct=false instead of silently switching to aio=threads, except
3216 * when called from drive_new().
3218 * For now, simply forbidding the combination for all drivers will do. */
3219 if (options
->has_aio
&& options
->aio
== BLOCKDEV_AIO_OPTIONS_NATIVE
) {
3220 bool direct
= options
->has_cache
&&
3221 options
->cache
->has_direct
&&
3222 options
->cache
->direct
;
3224 error_setg(errp
, "aio=native requires cache.direct=true");
3229 visit_type_BlockdevOptions(qmp_output_get_visitor(ov
),
3230 &options
, NULL
, &local_err
);
3232 error_propagate(errp
, local_err
);
3236 obj
= qmp_output_get_qobject(ov
);
3237 qdict
= qobject_to_qdict(obj
);
3239 qdict_flatten(qdict
);
3241 if (options
->has_id
) {
3242 blk
= blockdev_init(NULL
, qdict
, &local_err
);
3244 error_propagate(errp
, local_err
);
3250 if (!qdict_get_try_str(qdict
, "node-name")) {
3251 error_setg(errp
, "'id' and/or 'node-name' need to be specified for "
3256 bs
= bds_tree_init(qdict
, errp
);
3262 if (bs
&& bdrv_key_required(bs
)) {
3268 error_setg(errp
, "blockdev-add doesn't support encrypted devices");
3273 qmp_output_visitor_cleanup(ov
);
3276 BlockJobInfoList
*qmp_query_block_jobs(Error
**errp
)
3278 BlockJobInfoList
*head
= NULL
, **p_next
= &head
;
3279 BlockDriverState
*bs
;
3281 for (bs
= bdrv_next(NULL
); bs
; bs
= bdrv_next(bs
)) {
3282 AioContext
*aio_context
= bdrv_get_aio_context(bs
);
3284 aio_context_acquire(aio_context
);
3287 BlockJobInfoList
*elem
= g_new0(BlockJobInfoList
, 1);
3288 elem
->value
= block_job_query(bs
->job
);
3290 p_next
= &elem
->next
;
3293 aio_context_release(aio_context
);
3299 QemuOptsList qemu_common_drive_opts
= {
3301 .head
= QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts
.head
),
3305 .type
= QEMU_OPT_BOOL
,
3306 .help
= "enable/disable snapshot mode",
3309 .type
= QEMU_OPT_STRING
,
3310 .help
= "discard operation (ignore/off, unmap/on)",
3312 .name
= BDRV_OPT_CACHE_WB
,
3313 .type
= QEMU_OPT_BOOL
,
3314 .help
= "enables writeback mode for any caches",
3316 .name
= BDRV_OPT_CACHE_DIRECT
,
3317 .type
= QEMU_OPT_BOOL
,
3318 .help
= "enables use of O_DIRECT (bypass the host page cache)",
3320 .name
= BDRV_OPT_CACHE_NO_FLUSH
,
3321 .type
= QEMU_OPT_BOOL
,
3322 .help
= "ignore any flush requests for the device",
3325 .type
= QEMU_OPT_STRING
,
3326 .help
= "host AIO implementation (threads, native)",
3329 .type
= QEMU_OPT_STRING
,
3330 .help
= "disk format (raw, qcow2, ...)",
3333 .type
= QEMU_OPT_STRING
,
3334 .help
= "read error action",
3337 .type
= QEMU_OPT_STRING
,
3338 .help
= "write error action",
3340 .name
= "read-only",
3341 .type
= QEMU_OPT_BOOL
,
3342 .help
= "open drive file as read-only",
3344 .name
= "throttling.iops-total",
3345 .type
= QEMU_OPT_NUMBER
,
3346 .help
= "limit total I/O operations per second",
3348 .name
= "throttling.iops-read",
3349 .type
= QEMU_OPT_NUMBER
,
3350 .help
= "limit read operations per second",
3352 .name
= "throttling.iops-write",
3353 .type
= QEMU_OPT_NUMBER
,
3354 .help
= "limit write operations per second",
3356 .name
= "throttling.bps-total",
3357 .type
= QEMU_OPT_NUMBER
,
3358 .help
= "limit total bytes per second",
3360 .name
= "throttling.bps-read",
3361 .type
= QEMU_OPT_NUMBER
,
3362 .help
= "limit read bytes per second",
3364 .name
= "throttling.bps-write",
3365 .type
= QEMU_OPT_NUMBER
,
3366 .help
= "limit write bytes per second",
3368 .name
= "throttling.iops-total-max",
3369 .type
= QEMU_OPT_NUMBER
,
3370 .help
= "I/O operations burst",
3372 .name
= "throttling.iops-read-max",
3373 .type
= QEMU_OPT_NUMBER
,
3374 .help
= "I/O operations read burst",
3376 .name
= "throttling.iops-write-max",
3377 .type
= QEMU_OPT_NUMBER
,
3378 .help
= "I/O operations write burst",
3380 .name
= "throttling.bps-total-max",
3381 .type
= QEMU_OPT_NUMBER
,
3382 .help
= "total bytes burst",
3384 .name
= "throttling.bps-read-max",
3385 .type
= QEMU_OPT_NUMBER
,
3386 .help
= "total bytes read burst",
3388 .name
= "throttling.bps-write-max",
3389 .type
= QEMU_OPT_NUMBER
,
3390 .help
= "total bytes write burst",
3392 .name
= "throttling.iops-size",
3393 .type
= QEMU_OPT_NUMBER
,
3394 .help
= "when limiting by iops max size of an I/O in bytes",
3396 .name
= "throttling.group",
3397 .type
= QEMU_OPT_STRING
,
3398 .help
= "name of the block throttling group",
3400 .name
= "copy-on-read",
3401 .type
= QEMU_OPT_BOOL
,
3402 .help
= "copy read data from backing file into image file",
3404 .name
= "detect-zeroes",
3405 .type
= QEMU_OPT_STRING
,
3406 .help
= "try to optimize zero writes (off, on, unmap)",
3408 { /* end of list */ }
3412 static QemuOptsList qemu_root_bds_opts
= {
3414 .head
= QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts
.head
),
3418 .type
= QEMU_OPT_STRING
,
3419 .help
= "discard operation (ignore/off, unmap/on)",
3421 .name
= "cache.writeback",
3422 .type
= QEMU_OPT_BOOL
,
3423 .help
= "enables writeback mode for any caches",
3425 .name
= "cache.direct",
3426 .type
= QEMU_OPT_BOOL
,
3427 .help
= "enables use of O_DIRECT (bypass the host page cache)",
3429 .name
= "cache.no-flush",
3430 .type
= QEMU_OPT_BOOL
,
3431 .help
= "ignore any flush requests for the device",
3434 .type
= QEMU_OPT_STRING
,
3435 .help
= "host AIO implementation (threads, native)",
3437 .name
= "read-only",
3438 .type
= QEMU_OPT_BOOL
,
3439 .help
= "open drive file as read-only",
3441 .name
= "copy-on-read",
3442 .type
= QEMU_OPT_BOOL
,
3443 .help
= "copy read data from backing file into image file",
3445 .name
= "detect-zeroes",
3446 .type
= QEMU_OPT_STRING
,
3447 .help
= "try to optimize zero writes (off, on, unmap)",
3449 { /* end of list */ }
3453 QemuOptsList qemu_drive_opts
= {
3455 .head
= QTAILQ_HEAD_INITIALIZER(qemu_drive_opts
.head
),
3458 * no elements => accept any params
3459 * validation will happen later
3461 { /* end of list */ }