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 "monitor/monitor.h"
38 #include "qemu/option.h"
39 #include "qemu/config-file.h"
40 #include "qapi/qmp/types.h"
41 #include "qapi-visit.h"
42 #include "qapi/qmp-output-visitor.h"
43 #include "qapi/util.h"
44 #include "sysemu/sysemu.h"
45 #include "block/block_int.h"
46 #include "qmp-commands.h"
48 #include "sysemu/arch_init.h"
50 static const char *const if_name
[IF_COUNT
] = {
54 [IF_FLOPPY
] = "floppy",
55 [IF_PFLASH
] = "pflash",
58 [IF_VIRTIO
] = "virtio",
62 static int if_max_devs
[IF_COUNT
] = {
64 * Do not change these numbers! They govern how drive option
65 * index maps to unit and bus. That mapping is ABI.
67 * All controllers used to imlement if=T drives need to support
68 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
69 * Otherwise, some index values map to "impossible" bus, unit
72 * For instance, if you change [IF_SCSI] to 255, -drive
73 * if=scsi,index=12 no longer means bus=1,unit=5, but
74 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
75 * the drive can't be set up. Regression.
82 * Boards may call this to offer board-by-board overrides
83 * of the default, global values.
85 void override_max_devs(BlockInterfaceType type
, int max_devs
)
94 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
95 dinfo
= blk_legacy_dinfo(blk
);
96 if (dinfo
->type
== type
) {
97 fprintf(stderr
, "Cannot override units-per-bus property of"
98 " the %s interface, because a drive of that type has"
99 " already been added.\n", if_name
[type
]);
100 g_assert_not_reached();
104 if_max_devs
[type
] = max_devs
;
108 * We automatically delete the drive when a device using it gets
109 * unplugged. Questionable feature, but we can't just drop it.
110 * Device models call blockdev_mark_auto_del() to schedule the
111 * automatic deletion, and generic qdev code calls blockdev_auto_del()
112 * when deletion is actually safe.
114 void blockdev_mark_auto_del(BlockBackend
*blk
)
116 DriveInfo
*dinfo
= blk_legacy_dinfo(blk
);
117 BlockDriverState
*bs
= blk_bs(blk
);
118 AioContext
*aio_context
;
124 aio_context
= bdrv_get_aio_context(bs
);
125 aio_context_acquire(aio_context
);
128 block_job_cancel(bs
->job
);
131 aio_context_release(aio_context
);
136 void blockdev_auto_del(BlockBackend
*blk
)
138 DriveInfo
*dinfo
= blk_legacy_dinfo(blk
);
140 if (dinfo
&& dinfo
->auto_del
) {
146 * Returns the current mapping of how many units per bus
147 * a particular interface can support.
149 * A positive integer indicates n units per bus.
150 * 0 implies the mapping has not been established.
151 * -1 indicates an invalid BlockInterfaceType was given.
153 int drive_get_max_devs(BlockInterfaceType type
)
155 if (type
>= IF_IDE
&& type
< IF_COUNT
) {
156 return if_max_devs
[type
];
162 static int drive_index_to_bus_id(BlockInterfaceType type
, int index
)
164 int max_devs
= if_max_devs
[type
];
165 return max_devs
? index
/ max_devs
: 0;
168 static int drive_index_to_unit_id(BlockInterfaceType type
, int index
)
170 int max_devs
= if_max_devs
[type
];
171 return max_devs
? index
% max_devs
: index
;
174 QemuOpts
*drive_def(const char *optstr
)
176 return qemu_opts_parse(qemu_find_opts("drive"), optstr
, 0);
179 QemuOpts
*drive_add(BlockInterfaceType type
, int index
, const char *file
,
185 opts
= drive_def(optstr
);
189 if (type
!= IF_DEFAULT
) {
190 qemu_opt_set(opts
, "if", if_name
[type
]);
193 snprintf(buf
, sizeof(buf
), "%d", index
);
194 qemu_opt_set(opts
, "index", buf
);
197 qemu_opt_set(opts
, "file", file
);
201 DriveInfo
*drive_get(BlockInterfaceType type
, int bus
, int unit
)
206 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
207 dinfo
= blk_legacy_dinfo(blk
);
208 if (dinfo
&& dinfo
->type
== type
209 && dinfo
->bus
== bus
&& dinfo
->unit
== unit
) {
217 bool drive_check_orphaned(void)
223 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
224 dinfo
= blk_legacy_dinfo(blk
);
225 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
226 /* Unless this is a default drive, this may be an oversight. */
227 if (!blk_get_attached_dev(blk
) && !dinfo
->is_default
&&
228 dinfo
->type
!= IF_NONE
) {
229 fprintf(stderr
, "Warning: Orphaned drive without device: "
230 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
231 blk_name(blk
), blk_bs(blk
)->filename
, if_name
[dinfo
->type
],
232 dinfo
->bus
, dinfo
->unit
);
240 DriveInfo
*drive_get_by_index(BlockInterfaceType type
, int index
)
242 return drive_get(type
,
243 drive_index_to_bus_id(type
, index
),
244 drive_index_to_unit_id(type
, index
));
247 int drive_get_max_bus(BlockInterfaceType type
)
254 for (blk
= blk_next(NULL
); blk
; blk
= blk_next(blk
)) {
255 dinfo
= blk_legacy_dinfo(blk
);
256 if (dinfo
&& dinfo
->type
== type
&& dinfo
->bus
> max_bus
) {
257 max_bus
= dinfo
->bus
;
263 /* Get a block device. This should only be used for single-drive devices
264 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
266 DriveInfo
*drive_get_next(BlockInterfaceType type
)
268 static int next_block_unit
[IF_COUNT
];
270 return drive_get(type
, 0, next_block_unit
[type
]++);
273 static void bdrv_format_print(void *opaque
, const char *name
)
275 error_printf(" %s", name
);
280 BlockDriverState
*bs
;
283 static void bdrv_put_ref_bh(void *opaque
)
285 BDRVPutRefBH
*s
= opaque
;
288 qemu_bh_delete(s
->bh
);
293 * Release a BDS reference in a BH
295 * It is not safe to use bdrv_unref() from a callback function when the callers
296 * still need the BlockDriverState. In such cases we schedule a BH to release
299 static void bdrv_put_ref_bh_schedule(BlockDriverState
*bs
)
303 s
= g_new(BDRVPutRefBH
, 1);
304 s
->bh
= qemu_bh_new(bdrv_put_ref_bh
, s
);
306 qemu_bh_schedule(s
->bh
);
309 static int parse_block_error_action(const char *buf
, bool is_read
, Error
**errp
)
311 if (!strcmp(buf
, "ignore")) {
312 return BLOCKDEV_ON_ERROR_IGNORE
;
313 } else if (!is_read
&& !strcmp(buf
, "enospc")) {
314 return BLOCKDEV_ON_ERROR_ENOSPC
;
315 } else if (!strcmp(buf
, "stop")) {
316 return BLOCKDEV_ON_ERROR_STOP
;
317 } else if (!strcmp(buf
, "report")) {
318 return BLOCKDEV_ON_ERROR_REPORT
;
320 error_setg(errp
, "'%s' invalid %s error action",
321 buf
, is_read
? "read" : "write");
326 static bool check_throttle_config(ThrottleConfig
*cfg
, Error
**errp
)
328 if (throttle_conflicting(cfg
)) {
329 error_setg(errp
, "bps/iops/max total values and read/write values"
330 " cannot be used at the same time");
334 if (!throttle_is_valid(cfg
)) {
335 error_setg(errp
, "bps/iops/maxs values must be 0 or greater");
342 typedef enum { MEDIA_DISK
, MEDIA_CDROM
} DriveMediaType
;
344 /* Takes the ownership of bs_opts */
345 static BlockBackend
*blockdev_init(const char *file
, QDict
*bs_opts
,
351 int on_read_error
, on_write_error
;
353 BlockDriverState
*bs
;
361 bool has_driver_specific_opts
;
362 BlockdevDetectZeroesOptions detect_zeroes
;
363 BlockDriver
*drv
= NULL
;
365 /* Check common options by copying from bs_opts to opts, all other options
366 * stay in bs_opts for processing by bdrv_open(). */
367 id
= qdict_get_try_str(bs_opts
, "id");
368 opts
= qemu_opts_create(&qemu_common_drive_opts
, id
, 1, &error
);
370 error_propagate(errp
, error
);
374 qemu_opts_absorb_qdict(opts
, bs_opts
, &error
);
376 error_propagate(errp
, error
);
381 qdict_del(bs_opts
, "id");
384 has_driver_specific_opts
= !!qdict_size(bs_opts
);
386 /* extract parameters */
387 snapshot
= qemu_opt_get_bool(opts
, "snapshot", 0);
388 ro
= qemu_opt_get_bool(opts
, "read-only", 0);
389 copy_on_read
= qemu_opt_get_bool(opts
, "copy-on-read", false);
391 if ((buf
= qemu_opt_get(opts
, "discard")) != NULL
) {
392 if (bdrv_parse_discard_flags(buf
, &bdrv_flags
) != 0) {
393 error_setg(errp
, "invalid discard option");
398 if (qemu_opt_get_bool(opts
, "cache.writeback", true)) {
399 bdrv_flags
|= BDRV_O_CACHE_WB
;
401 if (qemu_opt_get_bool(opts
, "cache.direct", false)) {
402 bdrv_flags
|= BDRV_O_NOCACHE
;
404 if (qemu_opt_get_bool(opts
, "cache.no-flush", false)) {
405 bdrv_flags
|= BDRV_O_NO_FLUSH
;
408 #ifdef CONFIG_LINUX_AIO
409 if ((buf
= qemu_opt_get(opts
, "aio")) != NULL
) {
410 if (!strcmp(buf
, "native")) {
411 bdrv_flags
|= BDRV_O_NATIVE_AIO
;
412 } else if (!strcmp(buf
, "threads")) {
413 /* this is the default */
415 error_setg(errp
, "invalid aio option");
421 if ((buf
= qemu_opt_get(opts
, "format")) != NULL
) {
422 if (is_help_option(buf
)) {
423 error_printf("Supported formats:");
424 bdrv_iterate_format(bdrv_format_print
, NULL
);
429 drv
= bdrv_find_format(buf
);
431 error_setg(errp
, "'%s' invalid format", buf
);
436 /* disk I/O throttling */
437 memset(&cfg
, 0, sizeof(cfg
));
438 cfg
.buckets
[THROTTLE_BPS_TOTAL
].avg
=
439 qemu_opt_get_number(opts
, "throttling.bps-total", 0);
440 cfg
.buckets
[THROTTLE_BPS_READ
].avg
=
441 qemu_opt_get_number(opts
, "throttling.bps-read", 0);
442 cfg
.buckets
[THROTTLE_BPS_WRITE
].avg
=
443 qemu_opt_get_number(opts
, "throttling.bps-write", 0);
444 cfg
.buckets
[THROTTLE_OPS_TOTAL
].avg
=
445 qemu_opt_get_number(opts
, "throttling.iops-total", 0);
446 cfg
.buckets
[THROTTLE_OPS_READ
].avg
=
447 qemu_opt_get_number(opts
, "throttling.iops-read", 0);
448 cfg
.buckets
[THROTTLE_OPS_WRITE
].avg
=
449 qemu_opt_get_number(opts
, "throttling.iops-write", 0);
451 cfg
.buckets
[THROTTLE_BPS_TOTAL
].max
=
452 qemu_opt_get_number(opts
, "throttling.bps-total-max", 0);
453 cfg
.buckets
[THROTTLE_BPS_READ
].max
=
454 qemu_opt_get_number(opts
, "throttling.bps-read-max", 0);
455 cfg
.buckets
[THROTTLE_BPS_WRITE
].max
=
456 qemu_opt_get_number(opts
, "throttling.bps-write-max", 0);
457 cfg
.buckets
[THROTTLE_OPS_TOTAL
].max
=
458 qemu_opt_get_number(opts
, "throttling.iops-total-max", 0);
459 cfg
.buckets
[THROTTLE_OPS_READ
].max
=
460 qemu_opt_get_number(opts
, "throttling.iops-read-max", 0);
461 cfg
.buckets
[THROTTLE_OPS_WRITE
].max
=
462 qemu_opt_get_number(opts
, "throttling.iops-write-max", 0);
464 cfg
.op_size
= qemu_opt_get_number(opts
, "throttling.iops-size", 0);
466 if (!check_throttle_config(&cfg
, &error
)) {
467 error_propagate(errp
, error
);
471 on_write_error
= BLOCKDEV_ON_ERROR_ENOSPC
;
472 if ((buf
= qemu_opt_get(opts
, "werror")) != NULL
) {
473 on_write_error
= parse_block_error_action(buf
, 0, &error
);
475 error_propagate(errp
, error
);
480 on_read_error
= BLOCKDEV_ON_ERROR_REPORT
;
481 if ((buf
= qemu_opt_get(opts
, "rerror")) != NULL
) {
482 on_read_error
= parse_block_error_action(buf
, 1, &error
);
484 error_propagate(errp
, error
);
490 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup
,
491 qemu_opt_get(opts
, "detect-zeroes"),
492 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX
,
493 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
,
496 error_propagate(errp
, error
);
500 if (detect_zeroes
== BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP
&&
501 !(bdrv_flags
& BDRV_O_UNMAP
)) {
502 error_setg(errp
, "setting detect-zeroes to unmap is not allowed "
503 "without setting discard operation to unmap");
508 blk
= blk_new_with_bs(qemu_opts_id(opts
), errp
);
513 bs
->open_flags
= snapshot
? BDRV_O_SNAPSHOT
: 0;
515 bs
->detect_zeroes
= detect_zeroes
;
517 bdrv_set_on_error(bs
, on_read_error
, on_write_error
);
519 /* disk I/O throttling */
520 if (throttle_enabled(&cfg
)) {
521 bdrv_io_limits_enable(bs
);
522 bdrv_set_io_limits(bs
, &cfg
);
525 if (!file
|| !*file
) {
526 if (has_driver_specific_opts
) {
535 /* always use cache=unsafe with snapshot */
536 bdrv_flags
&= ~BDRV_O_CACHE_MASK
;
537 bdrv_flags
|= (BDRV_O_SNAPSHOT
|BDRV_O_CACHE_WB
|BDRV_O_NO_FLUSH
);
541 bdrv_flags
|= BDRV_O_COPY_ON_READ
;
544 if (runstate_check(RUN_STATE_INMIGRATE
)) {
545 bdrv_flags
|= BDRV_O_INCOMING
;
548 bdrv_flags
|= ro
? 0 : BDRV_O_RDWR
;
551 ret
= bdrv_open(&bs
, file
, NULL
, bs_opts
, bdrv_flags
, drv
, &error
);
552 assert(bs
== blk_bs(blk
));
555 error_setg(errp
, "could not open disk image %s: %s",
556 file
?: blk_name(blk
), error_get_pretty(error
));
561 if (bdrv_key_required(bs
)) {
579 static void qemu_opt_rename(QemuOpts
*opts
, const char *from
, const char *to
,
584 value
= qemu_opt_get(opts
, from
);
586 if (qemu_opt_find(opts
, to
)) {
587 error_setg(errp
, "'%s' and its alias '%s' can't be used at the "
588 "same time", to
, from
);
593 /* rename all items in opts */
594 while ((value
= qemu_opt_get(opts
, from
))) {
595 qemu_opt_set(opts
, to
, value
);
596 qemu_opt_unset(opts
, from
);
600 QemuOptsList qemu_legacy_drive_opts
= {
602 .head
= QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts
.head
),
606 .type
= QEMU_OPT_NUMBER
,
607 .help
= "bus number",
610 .type
= QEMU_OPT_NUMBER
,
611 .help
= "unit number (i.e. lun for scsi)",
614 .type
= QEMU_OPT_NUMBER
,
615 .help
= "index number",
618 .type
= QEMU_OPT_STRING
,
619 .help
= "media type (disk, cdrom)",
622 .type
= QEMU_OPT_STRING
,
623 .help
= "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
626 .type
= QEMU_OPT_NUMBER
,
627 .help
= "number of cylinders (ide disk geometry)",
630 .type
= QEMU_OPT_NUMBER
,
631 .help
= "number of heads (ide disk geometry)",
634 .type
= QEMU_OPT_NUMBER
,
635 .help
= "number of sectors (ide disk geometry)",
638 .type
= QEMU_OPT_STRING
,
639 .help
= "chs translation (auto, lba, none)",
642 .type
= QEMU_OPT_BOOL
,
643 .help
= "(deprecated, ignored)",
646 .type
= QEMU_OPT_STRING
,
647 .help
= "pci address (virtio only)",
650 .type
= QEMU_OPT_STRING
,
651 .help
= "disk serial number",
654 .type
= QEMU_OPT_STRING
,
658 /* Options that are passed on, but have special semantics with -drive */
661 .type
= QEMU_OPT_BOOL
,
662 .help
= "open drive file as read-only",
665 .type
= QEMU_OPT_STRING
,
666 .help
= "read error action",
669 .type
= QEMU_OPT_STRING
,
670 .help
= "write error action",
672 .name
= "copy-on-read",
673 .type
= QEMU_OPT_BOOL
,
674 .help
= "copy read data from backing file into image file",
677 { /* end of list */ }
681 DriveInfo
*drive_new(QemuOpts
*all_opts
, BlockInterfaceType block_default_type
)
685 DriveInfo
*dinfo
= NULL
;
687 QemuOpts
*legacy_opts
;
688 DriveMediaType media
= MEDIA_DISK
;
689 BlockInterfaceType type
;
690 int cyls
, heads
, secs
, translation
;
691 int max_devs
, bus_id
, unit_id
, index
;
693 const char *werror
, *rerror
;
694 bool read_only
= false;
697 const char *filename
;
698 Error
*local_err
= NULL
;
701 /* Change legacy command line options into QMP ones */
702 static const struct {
706 { "iops", "throttling.iops-total" },
707 { "iops_rd", "throttling.iops-read" },
708 { "iops_wr", "throttling.iops-write" },
710 { "bps", "throttling.bps-total" },
711 { "bps_rd", "throttling.bps-read" },
712 { "bps_wr", "throttling.bps-write" },
714 { "iops_max", "throttling.iops-total-max" },
715 { "iops_rd_max", "throttling.iops-read-max" },
716 { "iops_wr_max", "throttling.iops-write-max" },
718 { "bps_max", "throttling.bps-total-max" },
719 { "bps_rd_max", "throttling.bps-read-max" },
720 { "bps_wr_max", "throttling.bps-write-max" },
722 { "iops_size", "throttling.iops-size" },
724 { "readonly", "read-only" },
727 for (i
= 0; i
< ARRAY_SIZE(opt_renames
); i
++) {
728 qemu_opt_rename(all_opts
, opt_renames
[i
].from
, opt_renames
[i
].to
,
731 error_report("%s", error_get_pretty(local_err
));
732 error_free(local_err
);
737 value
= qemu_opt_get(all_opts
, "cache");
741 if (bdrv_parse_cache_flags(value
, &flags
) != 0) {
742 error_report("invalid cache option");
746 /* Specific options take precedence */
747 if (!qemu_opt_get(all_opts
, "cache.writeback")) {
748 qemu_opt_set_bool(all_opts
, "cache.writeback",
749 !!(flags
& BDRV_O_CACHE_WB
));
751 if (!qemu_opt_get(all_opts
, "cache.direct")) {
752 qemu_opt_set_bool(all_opts
, "cache.direct",
753 !!(flags
& BDRV_O_NOCACHE
));
755 if (!qemu_opt_get(all_opts
, "cache.no-flush")) {
756 qemu_opt_set_bool(all_opts
, "cache.no-flush",
757 !!(flags
& BDRV_O_NO_FLUSH
));
759 qemu_opt_unset(all_opts
, "cache");
762 /* Get a QDict for processing the options */
763 bs_opts
= qdict_new();
764 qemu_opts_to_qdict(all_opts
, bs_opts
);
766 legacy_opts
= qemu_opts_create(&qemu_legacy_drive_opts
, NULL
, 0,
768 qemu_opts_absorb_qdict(legacy_opts
, bs_opts
, &local_err
);
770 error_report("%s", error_get_pretty(local_err
));
771 error_free(local_err
);
775 /* Deprecated option boot=[on|off] */
776 if (qemu_opt_get(legacy_opts
, "boot") != NULL
) {
777 fprintf(stderr
, "qemu-kvm: boot=on|off is deprecated and will be "
778 "ignored. Future versions will reject this parameter. Please "
779 "update your scripts.\n");
783 value
= qemu_opt_get(legacy_opts
, "media");
785 if (!strcmp(value
, "disk")) {
787 } else if (!strcmp(value
, "cdrom")) {
791 error_report("'%s' invalid media", value
);
796 /* copy-on-read is disabled with a warning for read-only devices */
797 read_only
|= qemu_opt_get_bool(legacy_opts
, "read-only", false);
798 copy_on_read
= qemu_opt_get_bool(legacy_opts
, "copy-on-read", false);
800 if (read_only
&& copy_on_read
) {
801 error_report("warning: disabling copy-on-read on read-only drive");
802 copy_on_read
= false;
805 qdict_put(bs_opts
, "read-only",
806 qstring_from_str(read_only
? "on" : "off"));
807 qdict_put(bs_opts
, "copy-on-read",
808 qstring_from_str(copy_on_read
? "on" :"off"));
810 /* Controller type */
811 value
= qemu_opt_get(legacy_opts
, "if");
814 type
< IF_COUNT
&& strcmp(value
, if_name
[type
]);
817 if (type
== IF_COUNT
) {
818 error_report("unsupported bus type '%s'", value
);
822 type
= block_default_type
;
826 cyls
= qemu_opt_get_number(legacy_opts
, "cyls", 0);
827 heads
= qemu_opt_get_number(legacy_opts
, "heads", 0);
828 secs
= qemu_opt_get_number(legacy_opts
, "secs", 0);
830 if (cyls
|| heads
|| secs
) {
832 error_report("invalid physical cyls number");
836 error_report("invalid physical heads number");
840 error_report("invalid physical secs number");
845 translation
= BIOS_ATA_TRANSLATION_AUTO
;
846 value
= qemu_opt_get(legacy_opts
, "trans");
849 error_report("'%s' trans must be used with cyls, heads and secs",
853 if (!strcmp(value
, "none")) {
854 translation
= BIOS_ATA_TRANSLATION_NONE
;
855 } else if (!strcmp(value
, "lba")) {
856 translation
= BIOS_ATA_TRANSLATION_LBA
;
857 } else if (!strcmp(value
, "large")) {
858 translation
= BIOS_ATA_TRANSLATION_LARGE
;
859 } else if (!strcmp(value
, "rechs")) {
860 translation
= BIOS_ATA_TRANSLATION_RECHS
;
861 } else if (!strcmp(value
, "auto")) {
862 translation
= BIOS_ATA_TRANSLATION_AUTO
;
864 error_report("'%s' invalid translation type", value
);
869 if (media
== MEDIA_CDROM
) {
870 if (cyls
|| secs
|| heads
) {
871 error_report("CHS can't be set with media=cdrom");
876 /* Device address specified by bus/unit or index.
877 * If none was specified, try to find the first free one. */
878 bus_id
= qemu_opt_get_number(legacy_opts
, "bus", 0);
879 unit_id
= qemu_opt_get_number(legacy_opts
, "unit", -1);
880 index
= qemu_opt_get_number(legacy_opts
, "index", -1);
882 max_devs
= if_max_devs
[type
];
885 if (bus_id
!= 0 || unit_id
!= -1) {
886 error_report("index cannot be used with bus and unit");
889 bus_id
= drive_index_to_bus_id(type
, index
);
890 unit_id
= drive_index_to_unit_id(type
, index
);
895 while (drive_get(type
, bus_id
, unit_id
) != NULL
) {
897 if (max_devs
&& unit_id
>= max_devs
) {
904 if (max_devs
&& unit_id
>= max_devs
) {
905 error_report("unit %d too big (max is %d)", unit_id
, max_devs
- 1);
909 if (drive_get(type
, bus_id
, unit_id
) != NULL
) {
910 error_report("drive with bus=%d, unit=%d (index=%d) exists",
911 bus_id
, unit_id
, index
);
916 serial
= qemu_opt_get(legacy_opts
, "serial");
918 /* no id supplied -> create one */
919 if (qemu_opts_id(all_opts
) == NULL
) {
921 const char *mediastr
= "";
922 if (type
== IF_IDE
|| type
== IF_SCSI
) {
923 mediastr
= (media
== MEDIA_CDROM
) ? "-cd" : "-hd";
926 new_id
= g_strdup_printf("%s%i%s%i", if_name
[type
], bus_id
,
929 new_id
= g_strdup_printf("%s%s%i", if_name
[type
],
932 qdict_put(bs_opts
, "id", qstring_from_str(new_id
));
936 /* Add virtio block device */
937 devaddr
= qemu_opt_get(legacy_opts
, "addr");
938 if (devaddr
&& type
!= IF_VIRTIO
) {
939 error_report("addr is not supported by this bus type");
943 if (type
== IF_VIRTIO
) {
945 devopts
= qemu_opts_create(qemu_find_opts("device"), NULL
, 0,
947 if (arch_type
== QEMU_ARCH_S390X
) {
948 qemu_opt_set(devopts
, "driver", "virtio-blk-s390");
950 qemu_opt_set(devopts
, "driver", "virtio-blk-pci");
952 qemu_opt_set(devopts
, "drive", qdict_get_str(bs_opts
, "id"));
954 qemu_opt_set(devopts
, "addr", devaddr
);
958 filename
= qemu_opt_get(legacy_opts
, "file");
960 /* Check werror/rerror compatibility with if=... */
961 werror
= qemu_opt_get(legacy_opts
, "werror");
962 if (werror
!= NULL
) {
963 if (type
!= IF_IDE
&& type
!= IF_SCSI
&& type
!= IF_VIRTIO
&&
965 error_report("werror is not supported by this bus type");
968 qdict_put(bs_opts
, "werror", qstring_from_str(werror
));
971 rerror
= qemu_opt_get(legacy_opts
, "rerror");
972 if (rerror
!= NULL
) {
973 if (type
!= IF_IDE
&& type
!= IF_VIRTIO
&& type
!= IF_SCSI
&&
975 error_report("rerror is not supported by this bus type");
978 qdict_put(bs_opts
, "rerror", qstring_from_str(rerror
));
981 /* Actual block device init: Functionality shared with blockdev-add */
982 blk
= blockdev_init(filename
, bs_opts
, &local_err
);
986 error_report("%s", error_get_pretty(local_err
));
987 error_free(local_err
);
994 /* Create legacy DriveInfo */
995 dinfo
= g_malloc0(sizeof(*dinfo
));
996 dinfo
->opts
= all_opts
;
999 dinfo
->heads
= heads
;
1001 dinfo
->trans
= translation
;
1004 dinfo
->bus
= bus_id
;
1005 dinfo
->unit
= unit_id
;
1006 dinfo
->devaddr
= devaddr
;
1007 dinfo
->serial
= g_strdup(serial
);
1009 blk_set_legacy_dinfo(blk
, dinfo
);
1016 dinfo
->media_cd
= media
== MEDIA_CDROM
;
1023 qemu_opts_del(legacy_opts
);
1028 void do_commit(Monitor
*mon
, const QDict
*qdict
)
1030 const char *device
= qdict_get_str(qdict
, "device");
1031 BlockDriverState
*bs
;
1034 if (!strcmp(device
, "all")) {
1035 ret
= bdrv_commit_all();
1037 bs
= bdrv_find(device
);
1039 monitor_printf(mon
, "Device '%s' not found\n", device
);
1042 ret
= bdrv_commit(bs
);
1045 monitor_printf(mon
, "'commit' error for '%s': %s\n", device
,
1050 static void blockdev_do_action(int kind
, void *data
, Error
**errp
)
1052 TransactionAction action
;
1053 TransactionActionList list
;
1057 list
.value
= &action
;
1059 qmp_transaction(&list
, errp
);
1062 void qmp_blockdev_snapshot_sync(bool has_device
, const char *device
,
1063 bool has_node_name
, const char *node_name
,
1064 const char *snapshot_file
,
1065 bool has_snapshot_node_name
,
1066 const char *snapshot_node_name
,
1067 bool has_format
, const char *format
,
1068 bool has_mode
, NewImageMode mode
, Error
**errp
)
1070 BlockdevSnapshot snapshot
= {
1071 .has_device
= has_device
,
1072 .device
= (char *) device
,
1073 .has_node_name
= has_node_name
,
1074 .node_name
= (char *) node_name
,
1075 .snapshot_file
= (char *) snapshot_file
,
1076 .has_snapshot_node_name
= has_snapshot_node_name
,
1077 .snapshot_node_name
= (char *) snapshot_node_name
,
1078 .has_format
= has_format
,
1079 .format
= (char *) format
,
1080 .has_mode
= has_mode
,
1083 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
,
1087 void qmp_blockdev_snapshot_internal_sync(const char *device
,
1091 BlockdevSnapshotInternal snapshot
= {
1092 .device
= (char *) device
,
1093 .name
= (char *) name
1096 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
,
1100 SnapshotInfo
*qmp_blockdev_snapshot_delete_internal_sync(const char *device
,
1107 BlockDriverState
*bs
= bdrv_find(device
);
1108 AioContext
*aio_context
;
1109 QEMUSnapshotInfo sn
;
1110 Error
*local_err
= NULL
;
1111 SnapshotInfo
*info
= NULL
;
1115 error_set(errp
, QERR_DEVICE_NOT_FOUND
, device
);
1128 error_setg(errp
, "Name or id must be provided");
1132 aio_context
= bdrv_get_aio_context(bs
);
1133 aio_context_acquire(aio_context
);
1135 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE
, errp
)) {
1136 goto out_aio_context
;
1139 ret
= bdrv_snapshot_find_by_id_and_name(bs
, id
, name
, &sn
, &local_err
);
1141 error_propagate(errp
, local_err
);
1142 goto out_aio_context
;
1146 "Snapshot with id '%s' and name '%s' does not exist on "
1148 STR_OR_NULL(id
), STR_OR_NULL(name
), device
);
1149 goto out_aio_context
;
1152 bdrv_snapshot_delete(bs
, id
, name
, &local_err
);
1154 error_propagate(errp
, local_err
);
1155 goto out_aio_context
;
1158 aio_context_release(aio_context
);
1160 info
= g_new0(SnapshotInfo
, 1);
1161 info
->id
= g_strdup(sn
.id_str
);
1162 info
->name
= g_strdup(sn
.name
);
1163 info
->date_nsec
= sn
.date_nsec
;
1164 info
->date_sec
= sn
.date_sec
;
1165 info
->vm_state_size
= sn
.vm_state_size
;
1166 info
->vm_clock_nsec
= sn
.vm_clock_nsec
% 1000000000;
1167 info
->vm_clock_sec
= sn
.vm_clock_nsec
/ 1000000000;
1172 aio_context_release(aio_context
);
1176 /* New and old BlockDriverState structs for atomic group operations */
1178 typedef struct BlkTransactionState BlkTransactionState
;
1180 /* Only prepare() may fail. In a single transaction, only one of commit() or
1181 abort() will be called, clean() will always be called if it present. */
1182 typedef struct BdrvActionOps
{
1183 /* Size of state struct, in bytes. */
1184 size_t instance_size
;
1185 /* Prepare the work, must NOT be NULL. */
1186 void (*prepare
)(BlkTransactionState
*common
, Error
**errp
);
1187 /* Commit the changes, can be NULL. */
1188 void (*commit
)(BlkTransactionState
*common
);
1189 /* Abort the changes on fail, can be NULL. */
1190 void (*abort
)(BlkTransactionState
*common
);
1191 /* Clean up resource in the end, can be NULL. */
1192 void (*clean
)(BlkTransactionState
*common
);
1196 * This structure must be arranged as first member in child type, assuming
1197 * that compiler will also arrange it to the same address with parent instance.
1198 * Later it will be used in free().
1200 struct BlkTransactionState
{
1201 TransactionAction
*action
;
1202 const BdrvActionOps
*ops
;
1203 QSIMPLEQ_ENTRY(BlkTransactionState
) entry
;
1206 /* internal snapshot private data */
1207 typedef struct InternalSnapshotState
{
1208 BlkTransactionState common
;
1209 BlockDriverState
*bs
;
1210 AioContext
*aio_context
;
1211 QEMUSnapshotInfo sn
;
1212 } InternalSnapshotState
;
1214 static void internal_snapshot_prepare(BlkTransactionState
*common
,
1217 Error
*local_err
= NULL
;
1220 BlockDriverState
*bs
;
1221 QEMUSnapshotInfo old_sn
, *sn
;
1224 BlockdevSnapshotInternal
*internal
;
1225 InternalSnapshotState
*state
;
1228 g_assert(common
->action
->kind
==
1229 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
);
1230 internal
= common
->action
->blockdev_snapshot_internal_sync
;
1231 state
= DO_UPCAST(InternalSnapshotState
, common
, common
);
1233 /* 1. parse input */
1234 device
= internal
->device
;
1235 name
= internal
->name
;
1237 /* 2. check for validation */
1238 bs
= bdrv_find(device
);
1240 error_set(errp
, QERR_DEVICE_NOT_FOUND
, device
);
1244 /* AioContext is released in .clean() */
1245 state
->aio_context
= bdrv_get_aio_context(bs
);
1246 aio_context_acquire(state
->aio_context
);
1248 if (!bdrv_is_inserted(bs
)) {
1249 error_set(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1253 if (bdrv_is_read_only(bs
)) {
1254 error_set(errp
, QERR_DEVICE_IS_READ_ONLY
, device
);
1258 if (!bdrv_can_snapshot(bs
)) {
1259 error_set(errp
, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED
,
1260 bs
->drv
->format_name
, device
, "internal snapshot");
1264 if (!strlen(name
)) {
1265 error_setg(errp
, "Name is empty");
1269 /* check whether a snapshot with name exist */
1270 ret
= bdrv_snapshot_find_by_id_and_name(bs
, NULL
, name
, &old_sn
,
1273 error_propagate(errp
, local_err
);
1277 "Snapshot with name '%s' already exists on device '%s'",
1282 /* 3. take the snapshot */
1284 pstrcpy(sn
->name
, sizeof(sn
->name
), name
);
1285 qemu_gettimeofday(&tv
);
1286 sn
->date_sec
= tv
.tv_sec
;
1287 sn
->date_nsec
= tv
.tv_usec
* 1000;
1288 sn
->vm_clock_nsec
= qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
);
1290 ret1
= bdrv_snapshot_create(bs
, sn
);
1292 error_setg_errno(errp
, -ret1
,
1293 "Failed to create snapshot '%s' on device '%s'",
1298 /* 4. succeed, mark a snapshot is created */
1302 static void internal_snapshot_abort(BlkTransactionState
*common
)
1304 InternalSnapshotState
*state
=
1305 DO_UPCAST(InternalSnapshotState
, common
, common
);
1306 BlockDriverState
*bs
= state
->bs
;
1307 QEMUSnapshotInfo
*sn
= &state
->sn
;
1308 Error
*local_error
= NULL
;
1314 if (bdrv_snapshot_delete(bs
, sn
->id_str
, sn
->name
, &local_error
) < 0) {
1315 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1316 "device '%s' in abort: %s",
1319 bdrv_get_device_name(bs
),
1320 error_get_pretty(local_error
));
1321 error_free(local_error
);
1325 static void internal_snapshot_clean(BlkTransactionState
*common
)
1327 InternalSnapshotState
*state
= DO_UPCAST(InternalSnapshotState
,
1330 if (state
->aio_context
) {
1331 aio_context_release(state
->aio_context
);
1335 /* external snapshot private data */
1336 typedef struct ExternalSnapshotState
{
1337 BlkTransactionState common
;
1338 BlockDriverState
*old_bs
;
1339 BlockDriverState
*new_bs
;
1340 AioContext
*aio_context
;
1341 } ExternalSnapshotState
;
1343 static void external_snapshot_prepare(BlkTransactionState
*common
,
1348 QDict
*options
= NULL
;
1349 Error
*local_err
= NULL
;
1350 bool has_device
= false;
1352 bool has_node_name
= false;
1353 const char *node_name
;
1354 bool has_snapshot_node_name
= false;
1355 const char *snapshot_node_name
;
1356 const char *new_image_file
;
1357 const char *format
= "qcow2";
1358 enum NewImageMode mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
1359 ExternalSnapshotState
*state
=
1360 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1361 TransactionAction
*action
= common
->action
;
1363 /* get parameters */
1364 g_assert(action
->kind
== TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
);
1366 has_device
= action
->blockdev_snapshot_sync
->has_device
;
1367 device
= action
->blockdev_snapshot_sync
->device
;
1368 has_node_name
= action
->blockdev_snapshot_sync
->has_node_name
;
1369 node_name
= action
->blockdev_snapshot_sync
->node_name
;
1370 has_snapshot_node_name
=
1371 action
->blockdev_snapshot_sync
->has_snapshot_node_name
;
1372 snapshot_node_name
= action
->blockdev_snapshot_sync
->snapshot_node_name
;
1374 new_image_file
= action
->blockdev_snapshot_sync
->snapshot_file
;
1375 if (action
->blockdev_snapshot_sync
->has_format
) {
1376 format
= action
->blockdev_snapshot_sync
->format
;
1378 if (action
->blockdev_snapshot_sync
->has_mode
) {
1379 mode
= action
->blockdev_snapshot_sync
->mode
;
1382 /* start processing */
1383 drv
= bdrv_find_format(format
);
1385 error_set(errp
, QERR_INVALID_BLOCK_FORMAT
, format
);
1389 state
->old_bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
1390 has_node_name
? node_name
: NULL
,
1393 error_propagate(errp
, local_err
);
1397 if (has_node_name
&& !has_snapshot_node_name
) {
1398 error_setg(errp
, "New snapshot node name missing");
1402 if (has_snapshot_node_name
&& bdrv_find_node(snapshot_node_name
)) {
1403 error_setg(errp
, "New snapshot node name already existing");
1407 /* Acquire AioContext now so any threads operating on old_bs stop */
1408 state
->aio_context
= bdrv_get_aio_context(state
->old_bs
);
1409 aio_context_acquire(state
->aio_context
);
1411 if (!bdrv_is_inserted(state
->old_bs
)) {
1412 error_set(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1416 if (bdrv_op_is_blocked(state
->old_bs
,
1417 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
, errp
)) {
1421 if (!bdrv_is_read_only(state
->old_bs
)) {
1422 if (bdrv_flush(state
->old_bs
)) {
1423 error_set(errp
, QERR_IO_ERROR
);
1428 if (!bdrv_is_first_non_filter(state
->old_bs
)) {
1429 error_set(errp
, QERR_FEATURE_DISABLED
, "snapshot");
1433 flags
= state
->old_bs
->open_flags
;
1435 /* create new image w/backing file */
1436 if (mode
!= NEW_IMAGE_MODE_EXISTING
) {
1437 bdrv_img_create(new_image_file
, format
,
1438 state
->old_bs
->filename
,
1439 state
->old_bs
->drv
->format_name
,
1440 NULL
, -1, flags
, &local_err
, false);
1442 error_propagate(errp
, local_err
);
1447 if (has_snapshot_node_name
) {
1448 options
= qdict_new();
1449 qdict_put(options
, "node-name",
1450 qstring_from_str(snapshot_node_name
));
1453 /* TODO Inherit bs->options or only take explicit options with an
1454 * extended QMP command? */
1455 assert(state
->new_bs
== NULL
);
1456 ret
= bdrv_open(&state
->new_bs
, new_image_file
, NULL
, options
,
1457 flags
| BDRV_O_NO_BACKING
, drv
, &local_err
);
1458 /* We will manually add the backing_hd field to the bs later */
1460 error_propagate(errp
, local_err
);
1464 static void external_snapshot_commit(BlkTransactionState
*common
)
1466 ExternalSnapshotState
*state
=
1467 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1469 bdrv_set_aio_context(state
->new_bs
, state
->aio_context
);
1471 /* This removes our old bs and adds the new bs */
1472 bdrv_append(state
->new_bs
, state
->old_bs
);
1473 /* We don't need (or want) to use the transactional
1474 * bdrv_reopen_multiple() across all the entries at once, because we
1475 * don't want to abort all of them if one of them fails the reopen */
1476 bdrv_reopen(state
->new_bs
, state
->new_bs
->open_flags
& ~BDRV_O_RDWR
,
1479 aio_context_release(state
->aio_context
);
1482 static void external_snapshot_abort(BlkTransactionState
*common
)
1484 ExternalSnapshotState
*state
=
1485 DO_UPCAST(ExternalSnapshotState
, common
, common
);
1486 if (state
->new_bs
) {
1487 bdrv_unref(state
->new_bs
);
1489 if (state
->aio_context
) {
1490 aio_context_release(state
->aio_context
);
1494 typedef struct DriveBackupState
{
1495 BlkTransactionState common
;
1496 BlockDriverState
*bs
;
1497 AioContext
*aio_context
;
1501 static void drive_backup_prepare(BlkTransactionState
*common
, Error
**errp
)
1503 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1504 BlockDriverState
*bs
;
1505 DriveBackup
*backup
;
1506 Error
*local_err
= NULL
;
1508 assert(common
->action
->kind
== TRANSACTION_ACTION_KIND_DRIVE_BACKUP
);
1509 backup
= common
->action
->drive_backup
;
1511 bs
= bdrv_find(backup
->device
);
1513 error_set(errp
, QERR_DEVICE_NOT_FOUND
, backup
->device
);
1517 /* AioContext is released in .clean() */
1518 state
->aio_context
= bdrv_get_aio_context(bs
);
1519 aio_context_acquire(state
->aio_context
);
1521 qmp_drive_backup(backup
->device
, backup
->target
,
1522 backup
->has_format
, backup
->format
,
1524 backup
->has_mode
, backup
->mode
,
1525 backup
->has_speed
, backup
->speed
,
1526 backup
->has_on_source_error
, backup
->on_source_error
,
1527 backup
->has_on_target_error
, backup
->on_target_error
,
1530 error_propagate(errp
, local_err
);
1535 state
->job
= state
->bs
->job
;
1538 static void drive_backup_abort(BlkTransactionState
*common
)
1540 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1541 BlockDriverState
*bs
= state
->bs
;
1543 /* Only cancel if it's the job we started */
1544 if (bs
&& bs
->job
&& bs
->job
== state
->job
) {
1545 block_job_cancel_sync(bs
->job
);
1549 static void drive_backup_clean(BlkTransactionState
*common
)
1551 DriveBackupState
*state
= DO_UPCAST(DriveBackupState
, common
, common
);
1553 if (state
->aio_context
) {
1554 aio_context_release(state
->aio_context
);
1558 static void abort_prepare(BlkTransactionState
*common
, Error
**errp
)
1560 error_setg(errp
, "Transaction aborted using Abort action");
1563 static void abort_commit(BlkTransactionState
*common
)
1565 g_assert_not_reached(); /* this action never succeeds */
1568 static const BdrvActionOps actions
[] = {
1569 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC
] = {
1570 .instance_size
= sizeof(ExternalSnapshotState
),
1571 .prepare
= external_snapshot_prepare
,
1572 .commit
= external_snapshot_commit
,
1573 .abort
= external_snapshot_abort
,
1575 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP
] = {
1576 .instance_size
= sizeof(DriveBackupState
),
1577 .prepare
= drive_backup_prepare
,
1578 .abort
= drive_backup_abort
,
1579 .clean
= drive_backup_clean
,
1581 [TRANSACTION_ACTION_KIND_ABORT
] = {
1582 .instance_size
= sizeof(BlkTransactionState
),
1583 .prepare
= abort_prepare
,
1584 .commit
= abort_commit
,
1586 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC
] = {
1587 .instance_size
= sizeof(InternalSnapshotState
),
1588 .prepare
= internal_snapshot_prepare
,
1589 .abort
= internal_snapshot_abort
,
1590 .clean
= internal_snapshot_clean
,
1595 * 'Atomic' group operations. The operations are performed as a set, and if
1596 * any fail then we roll back all operations in the group.
1598 void qmp_transaction(TransactionActionList
*dev_list
, Error
**errp
)
1600 TransactionActionList
*dev_entry
= dev_list
;
1601 BlkTransactionState
*state
, *next
;
1602 Error
*local_err
= NULL
;
1604 QSIMPLEQ_HEAD(snap_bdrv_states
, BlkTransactionState
) snap_bdrv_states
;
1605 QSIMPLEQ_INIT(&snap_bdrv_states
);
1607 /* drain all i/o before any operations */
1610 /* We don't do anything in this loop that commits us to the operations */
1611 while (NULL
!= dev_entry
) {
1612 TransactionAction
*dev_info
= NULL
;
1613 const BdrvActionOps
*ops
;
1615 dev_info
= dev_entry
->value
;
1616 dev_entry
= dev_entry
->next
;
1618 assert(dev_info
->kind
< ARRAY_SIZE(actions
));
1620 ops
= &actions
[dev_info
->kind
];
1621 assert(ops
->instance_size
> 0);
1623 state
= g_malloc0(ops
->instance_size
);
1625 state
->action
= dev_info
;
1626 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states
, state
, entry
);
1628 state
->ops
->prepare(state
, &local_err
);
1630 error_propagate(errp
, local_err
);
1631 goto delete_and_fail
;
1635 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
1636 if (state
->ops
->commit
) {
1637 state
->ops
->commit(state
);
1645 /* failure, and it is all-or-none; roll back all operations */
1646 QSIMPLEQ_FOREACH(state
, &snap_bdrv_states
, entry
) {
1647 if (state
->ops
->abort
) {
1648 state
->ops
->abort(state
);
1652 QSIMPLEQ_FOREACH_SAFE(state
, &snap_bdrv_states
, entry
, next
) {
1653 if (state
->ops
->clean
) {
1654 state
->ops
->clean(state
);
1661 static void eject_device(BlockBackend
*blk
, int force
, Error
**errp
)
1663 BlockDriverState
*bs
= blk_bs(blk
);
1664 AioContext
*aio_context
;
1666 aio_context
= bdrv_get_aio_context(bs
);
1667 aio_context_acquire(aio_context
);
1669 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_EJECT
, errp
)) {
1672 if (!blk_dev_has_removable_media(blk
)) {
1673 error_setg(errp
, "Device '%s' is not removable",
1674 bdrv_get_device_name(bs
));
1678 if (blk_dev_is_medium_locked(blk
) && !blk_dev_is_tray_open(blk
)) {
1679 blk_dev_eject_request(blk
, force
);
1681 error_setg(errp
, "Device '%s' is locked",
1682 bdrv_get_device_name(bs
));
1690 aio_context_release(aio_context
);
1693 void qmp_eject(const char *device
, bool has_force
, bool force
, Error
**errp
)
1697 blk
= blk_by_name(device
);
1699 error_set(errp
, QERR_DEVICE_NOT_FOUND
, device
);
1703 eject_device(blk
, force
, errp
);
1706 void qmp_block_passwd(bool has_device
, const char *device
,
1707 bool has_node_name
, const char *node_name
,
1708 const char *password
, Error
**errp
)
1710 Error
*local_err
= NULL
;
1711 BlockDriverState
*bs
;
1712 AioContext
*aio_context
;
1715 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
1716 has_node_name
? node_name
: NULL
,
1719 error_propagate(errp
, local_err
);
1723 aio_context
= bdrv_get_aio_context(bs
);
1724 aio_context_acquire(aio_context
);
1726 err
= bdrv_set_key(bs
, password
);
1727 if (err
== -EINVAL
) {
1728 error_set(errp
, QERR_DEVICE_NOT_ENCRYPTED
, bdrv_get_device_name(bs
));
1730 } else if (err
< 0) {
1731 error_set(errp
, QERR_INVALID_PASSWORD
);
1736 aio_context_release(aio_context
);
1739 /* Assumes AioContext is held */
1740 static void qmp_bdrv_open_encrypted(BlockDriverState
*bs
, const char *filename
,
1741 int bdrv_flags
, BlockDriver
*drv
,
1742 const char *password
, Error
**errp
)
1744 Error
*local_err
= NULL
;
1747 ret
= bdrv_open(&bs
, filename
, NULL
, NULL
, bdrv_flags
, drv
, &local_err
);
1749 error_propagate(errp
, local_err
);
1753 if (bdrv_key_required(bs
)) {
1755 if (bdrv_set_key(bs
, password
) < 0) {
1756 error_set(errp
, QERR_INVALID_PASSWORD
);
1759 error_set(errp
, QERR_DEVICE_ENCRYPTED
, bdrv_get_device_name(bs
),
1760 bdrv_get_encrypted_filename(bs
));
1762 } else if (password
) {
1763 error_set(errp
, QERR_DEVICE_NOT_ENCRYPTED
, bdrv_get_device_name(bs
));
1767 void qmp_change_blockdev(const char *device
, const char *filename
,
1768 const char *format
, Error
**errp
)
1771 BlockDriverState
*bs
;
1772 AioContext
*aio_context
;
1773 BlockDriver
*drv
= NULL
;
1777 blk
= blk_by_name(device
);
1779 error_set(errp
, QERR_DEVICE_NOT_FOUND
, device
);
1784 aio_context
= bdrv_get_aio_context(bs
);
1785 aio_context_acquire(aio_context
);
1788 drv
= bdrv_find_whitelisted_format(format
, bs
->read_only
);
1790 error_set(errp
, QERR_INVALID_BLOCK_FORMAT
, format
);
1795 eject_device(blk
, 0, &err
);
1797 error_propagate(errp
, err
);
1801 bdrv_flags
= bdrv_is_read_only(bs
) ? 0 : BDRV_O_RDWR
;
1802 bdrv_flags
|= bdrv_is_snapshot(bs
) ? BDRV_O_SNAPSHOT
: 0;
1804 qmp_bdrv_open_encrypted(bs
, filename
, bdrv_flags
, drv
, NULL
, errp
);
1807 aio_context_release(aio_context
);
1810 /* throttling disk I/O limits */
1811 void qmp_block_set_io_throttle(const char *device
, int64_t bps
, int64_t bps_rd
,
1818 bool has_bps_rd_max
,
1820 bool has_bps_wr_max
,
1824 bool has_iops_rd_max
,
1825 int64_t iops_rd_max
,
1826 bool has_iops_wr_max
,
1827 int64_t iops_wr_max
,
1829 int64_t iops_size
, Error
**errp
)
1832 BlockDriverState
*bs
;
1833 AioContext
*aio_context
;
1835 bs
= bdrv_find(device
);
1837 error_set(errp
, QERR_DEVICE_NOT_FOUND
, device
);
1841 memset(&cfg
, 0, sizeof(cfg
));
1842 cfg
.buckets
[THROTTLE_BPS_TOTAL
].avg
= bps
;
1843 cfg
.buckets
[THROTTLE_BPS_READ
].avg
= bps_rd
;
1844 cfg
.buckets
[THROTTLE_BPS_WRITE
].avg
= bps_wr
;
1846 cfg
.buckets
[THROTTLE_OPS_TOTAL
].avg
= iops
;
1847 cfg
.buckets
[THROTTLE_OPS_READ
].avg
= iops_rd
;
1848 cfg
.buckets
[THROTTLE_OPS_WRITE
].avg
= iops_wr
;
1851 cfg
.buckets
[THROTTLE_BPS_TOTAL
].max
= bps_max
;
1853 if (has_bps_rd_max
) {
1854 cfg
.buckets
[THROTTLE_BPS_READ
].max
= bps_rd_max
;
1856 if (has_bps_wr_max
) {
1857 cfg
.buckets
[THROTTLE_BPS_WRITE
].max
= bps_wr_max
;
1860 cfg
.buckets
[THROTTLE_OPS_TOTAL
].max
= iops_max
;
1862 if (has_iops_rd_max
) {
1863 cfg
.buckets
[THROTTLE_OPS_READ
].max
= iops_rd_max
;
1865 if (has_iops_wr_max
) {
1866 cfg
.buckets
[THROTTLE_OPS_WRITE
].max
= iops_wr_max
;
1869 if (has_iops_size
) {
1870 cfg
.op_size
= iops_size
;
1873 if (!check_throttle_config(&cfg
, errp
)) {
1877 aio_context
= bdrv_get_aio_context(bs
);
1878 aio_context_acquire(aio_context
);
1880 if (!bs
->io_limits_enabled
&& throttle_enabled(&cfg
)) {
1881 bdrv_io_limits_enable(bs
);
1882 } else if (bs
->io_limits_enabled
&& !throttle_enabled(&cfg
)) {
1883 bdrv_io_limits_disable(bs
);
1886 if (bs
->io_limits_enabled
) {
1887 bdrv_set_io_limits(bs
, &cfg
);
1890 aio_context_release(aio_context
);
1893 int do_drive_del(Monitor
*mon
, const QDict
*qdict
, QObject
**ret_data
)
1895 const char *id
= qdict_get_str(qdict
, "id");
1897 BlockDriverState
*bs
;
1898 AioContext
*aio_context
;
1899 Error
*local_err
= NULL
;
1901 blk
= blk_by_name(id
);
1903 error_report("Device '%s' not found", id
);
1908 if (!blk_legacy_dinfo(blk
)) {
1909 error_report("Deleting device added with blockdev-add"
1910 " is not supported");
1914 aio_context
= bdrv_get_aio_context(bs
);
1915 aio_context_acquire(aio_context
);
1917 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_DRIVE_DEL
, &local_err
)) {
1918 error_report("%s", error_get_pretty(local_err
));
1919 error_free(local_err
);
1920 aio_context_release(aio_context
);
1924 /* quiesce block driver; prevent further io */
1929 /* if we have a device attached to this BlockDriverState
1930 * then we need to make the drive anonymous until the device
1931 * can be removed. If this is a drive with no device backing
1932 * then we can just get rid of the block driver state right here.
1934 if (blk_get_attached_dev(blk
)) {
1935 blk_hide_on_behalf_of_do_drive_del(blk
);
1936 /* Further I/O must not pause the guest */
1937 bdrv_set_on_error(bs
, BLOCKDEV_ON_ERROR_REPORT
,
1938 BLOCKDEV_ON_ERROR_REPORT
);
1943 aio_context_release(aio_context
);
1947 void qmp_block_resize(bool has_device
, const char *device
,
1948 bool has_node_name
, const char *node_name
,
1949 int64_t size
, Error
**errp
)
1951 Error
*local_err
= NULL
;
1952 BlockDriverState
*bs
;
1953 AioContext
*aio_context
;
1956 bs
= bdrv_lookup_bs(has_device
? device
: NULL
,
1957 has_node_name
? node_name
: NULL
,
1960 error_propagate(errp
, local_err
);
1964 aio_context
= bdrv_get_aio_context(bs
);
1965 aio_context_acquire(aio_context
);
1967 if (!bdrv_is_first_non_filter(bs
)) {
1968 error_set(errp
, QERR_FEATURE_DISABLED
, "resize");
1973 error_set(errp
, QERR_INVALID_PARAMETER_VALUE
, "size", "a >0 size");
1977 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_RESIZE
, NULL
)) {
1978 error_set(errp
, QERR_DEVICE_IN_USE
, device
);
1982 /* complete all in-flight operations before resizing the device */
1985 ret
= bdrv_truncate(bs
, size
);
1990 error_set(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
1993 error_set(errp
, QERR_UNSUPPORTED
);
1996 error_set(errp
, QERR_DEVICE_IS_READ_ONLY
, device
);
1999 error_set(errp
, QERR_DEVICE_IN_USE
, device
);
2002 error_setg_errno(errp
, -ret
, "Could not resize");
2007 aio_context_release(aio_context
);
2010 static void block_job_cb(void *opaque
, int ret
)
2012 /* Note that this function may be executed from another AioContext besides
2013 * the QEMU main loop. If you need to access anything that assumes the
2014 * QEMU global mutex, use a BH or introduce a mutex.
2017 BlockDriverState
*bs
= opaque
;
2018 const char *msg
= NULL
;
2020 trace_block_job_cb(bs
, bs
->job
, ret
);
2025 msg
= strerror(-ret
);
2028 if (block_job_is_cancelled(bs
->job
)) {
2029 block_job_event_cancelled(bs
->job
);
2031 block_job_event_completed(bs
->job
, msg
);
2034 bdrv_put_ref_bh_schedule(bs
);
2037 void qmp_block_stream(const char *device
,
2038 bool has_base
, const char *base
,
2039 bool has_backing_file
, const char *backing_file
,
2040 bool has_speed
, int64_t speed
,
2041 bool has_on_error
, BlockdevOnError on_error
,
2044 BlockDriverState
*bs
;
2045 BlockDriverState
*base_bs
= NULL
;
2046 AioContext
*aio_context
;
2047 Error
*local_err
= NULL
;
2048 const char *base_name
= NULL
;
2050 if (!has_on_error
) {
2051 on_error
= BLOCKDEV_ON_ERROR_REPORT
;
2054 bs
= bdrv_find(device
);
2056 error_set(errp
, QERR_DEVICE_NOT_FOUND
, device
);
2060 aio_context
= bdrv_get_aio_context(bs
);
2061 aio_context_acquire(aio_context
);
2063 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_STREAM
, errp
)) {
2068 base_bs
= bdrv_find_backing_image(bs
, base
);
2069 if (base_bs
== NULL
) {
2070 error_set(errp
, QERR_BASE_NOT_FOUND
, base
);
2073 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
2077 /* if we are streaming the entire chain, the result will have no backing
2078 * file, and specifying one is therefore an error */
2079 if (base_bs
== NULL
&& has_backing_file
) {
2080 error_setg(errp
, "backing file specified, but streaming the "
2085 /* backing_file string overrides base bs filename */
2086 base_name
= has_backing_file
? backing_file
: base_name
;
2088 stream_start(bs
, base_bs
, base_name
, has_speed
? speed
: 0,
2089 on_error
, block_job_cb
, bs
, &local_err
);
2091 error_propagate(errp
, local_err
);
2095 trace_qmp_block_stream(bs
, bs
->job
);
2098 aio_context_release(aio_context
);
2101 void qmp_block_commit(const char *device
,
2102 bool has_base
, const char *base
,
2103 bool has_top
, const char *top
,
2104 bool has_backing_file
, const char *backing_file
,
2105 bool has_speed
, int64_t speed
,
2108 BlockDriverState
*bs
;
2109 BlockDriverState
*base_bs
, *top_bs
;
2110 AioContext
*aio_context
;
2111 Error
*local_err
= NULL
;
2112 /* This will be part of the QMP command, if/when the
2113 * BlockdevOnError change for blkmirror makes it in
2115 BlockdevOnError on_error
= BLOCKDEV_ON_ERROR_REPORT
;
2122 * libvirt relies on the DeviceNotFound error class in order to probe for
2123 * live commit feature versions; for this to work, we must make sure to
2124 * perform the device lookup before any generic errors that may occur in a
2125 * scenario in which all optional arguments are omitted. */
2126 bs
= bdrv_find(device
);
2128 error_set(errp
, QERR_DEVICE_NOT_FOUND
, device
);
2132 aio_context
= bdrv_get_aio_context(bs
);
2133 aio_context_acquire(aio_context
);
2135 /* drain all i/o before commits */
2138 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_COMMIT
, errp
)) {
2142 /* default top_bs is the active layer */
2145 if (has_top
&& top
) {
2146 if (strcmp(bs
->filename
, top
) != 0) {
2147 top_bs
= bdrv_find_backing_image(bs
, top
);
2151 if (top_bs
== NULL
) {
2152 error_setg(errp
, "Top image file %s not found", top
? top
: "NULL");
2156 assert(bdrv_get_aio_context(top_bs
) == aio_context
);
2158 if (has_base
&& base
) {
2159 base_bs
= bdrv_find_backing_image(top_bs
, base
);
2161 base_bs
= bdrv_find_base(top_bs
);
2164 if (base_bs
== NULL
) {
2165 error_set(errp
, QERR_BASE_NOT_FOUND
, base
? base
: "NULL");
2169 assert(bdrv_get_aio_context(base_bs
) == aio_context
);
2171 /* Do not allow attempts to commit an image into itself */
2172 if (top_bs
== base_bs
) {
2173 error_setg(errp
, "cannot commit an image into itself");
2178 if (has_backing_file
) {
2179 error_setg(errp
, "'backing-file' specified,"
2180 " but 'top' is the active layer");
2183 commit_active_start(bs
, base_bs
, speed
, on_error
, block_job_cb
,
2186 commit_start(bs
, base_bs
, top_bs
, speed
, on_error
, block_job_cb
, bs
,
2187 has_backing_file
? backing_file
: NULL
, &local_err
);
2189 if (local_err
!= NULL
) {
2190 error_propagate(errp
, local_err
);
2195 aio_context_release(aio_context
);
2198 void qmp_drive_backup(const char *device
, const char *target
,
2199 bool has_format
, const char *format
,
2200 enum MirrorSyncMode sync
,
2201 bool has_mode
, enum NewImageMode mode
,
2202 bool has_speed
, int64_t speed
,
2203 bool has_on_source_error
, BlockdevOnError on_source_error
,
2204 bool has_on_target_error
, BlockdevOnError on_target_error
,
2207 BlockDriverState
*bs
;
2208 BlockDriverState
*target_bs
;
2209 BlockDriverState
*source
= NULL
;
2210 AioContext
*aio_context
;
2211 BlockDriver
*drv
= NULL
;
2212 Error
*local_err
= NULL
;
2220 if (!has_on_source_error
) {
2221 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
2223 if (!has_on_target_error
) {
2224 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
2227 mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
2230 bs
= bdrv_find(device
);
2232 error_set(errp
, QERR_DEVICE_NOT_FOUND
, device
);
2236 aio_context
= bdrv_get_aio_context(bs
);
2237 aio_context_acquire(aio_context
);
2239 if (!bdrv_is_inserted(bs
)) {
2240 error_set(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
2245 format
= mode
== NEW_IMAGE_MODE_EXISTING
? NULL
: bs
->drv
->format_name
;
2248 drv
= bdrv_find_format(format
);
2250 error_set(errp
, QERR_INVALID_BLOCK_FORMAT
, format
);
2255 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_BACKUP_SOURCE
, errp
)) {
2259 flags
= bs
->open_flags
| BDRV_O_RDWR
;
2261 /* See if we have a backing HD we can use to create our new image
2263 if (sync
== MIRROR_SYNC_MODE_TOP
) {
2264 source
= bs
->backing_hd
;
2266 sync
= MIRROR_SYNC_MODE_FULL
;
2269 if (sync
== MIRROR_SYNC_MODE_NONE
) {
2273 size
= bdrv_getlength(bs
);
2275 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
2279 if (mode
!= NEW_IMAGE_MODE_EXISTING
) {
2280 assert(format
&& drv
);
2282 bdrv_img_create(target
, format
, source
->filename
,
2283 source
->drv
->format_name
, NULL
,
2284 size
, flags
, &local_err
, false);
2286 bdrv_img_create(target
, format
, NULL
, NULL
, NULL
,
2287 size
, flags
, &local_err
, false);
2292 error_propagate(errp
, local_err
);
2297 ret
= bdrv_open(&target_bs
, target
, NULL
, NULL
, flags
, drv
, &local_err
);
2299 error_propagate(errp
, local_err
);
2303 bdrv_set_aio_context(target_bs
, aio_context
);
2305 backup_start(bs
, target_bs
, speed
, sync
, on_source_error
, on_target_error
,
2306 block_job_cb
, bs
, &local_err
);
2307 if (local_err
!= NULL
) {
2308 bdrv_unref(target_bs
);
2309 error_propagate(errp
, local_err
);
2314 aio_context_release(aio_context
);
2317 BlockDeviceInfoList
*qmp_query_named_block_nodes(Error
**errp
)
2319 return bdrv_named_nodes_list();
2322 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
2324 void qmp_drive_mirror(const char *device
, const char *target
,
2325 bool has_format
, const char *format
,
2326 bool has_node_name
, const char *node_name
,
2327 bool has_replaces
, const char *replaces
,
2328 enum MirrorSyncMode sync
,
2329 bool has_mode
, enum NewImageMode mode
,
2330 bool has_speed
, int64_t speed
,
2331 bool has_granularity
, uint32_t granularity
,
2332 bool has_buf_size
, int64_t buf_size
,
2333 bool has_on_source_error
, BlockdevOnError on_source_error
,
2334 bool has_on_target_error
, BlockdevOnError on_target_error
,
2337 BlockDriverState
*bs
;
2338 BlockDriverState
*source
, *target_bs
;
2339 AioContext
*aio_context
;
2340 BlockDriver
*drv
= NULL
;
2341 Error
*local_err
= NULL
;
2342 QDict
*options
= NULL
;
2350 if (!has_on_source_error
) {
2351 on_source_error
= BLOCKDEV_ON_ERROR_REPORT
;
2353 if (!has_on_target_error
) {
2354 on_target_error
= BLOCKDEV_ON_ERROR_REPORT
;
2357 mode
= NEW_IMAGE_MODE_ABSOLUTE_PATHS
;
2359 if (!has_granularity
) {
2362 if (!has_buf_size
) {
2363 buf_size
= DEFAULT_MIRROR_BUF_SIZE
;
2366 if (granularity
!= 0 && (granularity
< 512 || granularity
> 1048576 * 64)) {
2367 error_set(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity",
2368 "a value in range [512B, 64MB]");
2371 if (granularity
& (granularity
- 1)) {
2372 error_set(errp
, QERR_INVALID_PARAMETER_VALUE
, "granularity", "power of 2");
2376 bs
= bdrv_find(device
);
2378 error_set(errp
, QERR_DEVICE_NOT_FOUND
, device
);
2382 aio_context
= bdrv_get_aio_context(bs
);
2383 aio_context_acquire(aio_context
);
2385 if (!bdrv_is_inserted(bs
)) {
2386 error_set(errp
, QERR_DEVICE_HAS_NO_MEDIUM
, device
);
2391 format
= mode
== NEW_IMAGE_MODE_EXISTING
? NULL
: bs
->drv
->format_name
;
2394 drv
= bdrv_find_format(format
);
2396 error_set(errp
, QERR_INVALID_BLOCK_FORMAT
, format
);
2401 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_MIRROR
, errp
)) {
2405 flags
= bs
->open_flags
| BDRV_O_RDWR
;
2406 source
= bs
->backing_hd
;
2407 if (!source
&& sync
== MIRROR_SYNC_MODE_TOP
) {
2408 sync
= MIRROR_SYNC_MODE_FULL
;
2410 if (sync
== MIRROR_SYNC_MODE_NONE
) {
2414 size
= bdrv_getlength(bs
);
2416 error_setg_errno(errp
, -size
, "bdrv_getlength failed");
2421 BlockDriverState
*to_replace_bs
;
2422 AioContext
*replace_aio_context
;
2423 int64_t replace_size
;
2425 if (!has_node_name
) {
2426 error_setg(errp
, "a node-name must be provided when replacing a"
2427 " named node of the graph");
2431 to_replace_bs
= check_to_replace_node(replaces
, &local_err
);
2433 if (!to_replace_bs
) {
2434 error_propagate(errp
, local_err
);
2438 replace_aio_context
= bdrv_get_aio_context(to_replace_bs
);
2439 aio_context_acquire(replace_aio_context
);
2440 replace_size
= bdrv_getlength(to_replace_bs
);
2441 aio_context_release(replace_aio_context
);
2443 if (size
!= replace_size
) {
2444 error_setg(errp
, "cannot replace image with a mirror image of "
2450 if ((sync
== MIRROR_SYNC_MODE_FULL
|| !source
)
2451 && mode
!= NEW_IMAGE_MODE_EXISTING
)
2453 /* create new image w/o backing file */
2454 assert(format
&& drv
);
2455 bdrv_img_create(target
, format
,
2456 NULL
, NULL
, NULL
, size
, flags
, &local_err
, false);
2459 case NEW_IMAGE_MODE_EXISTING
:
2461 case NEW_IMAGE_MODE_ABSOLUTE_PATHS
:
2462 /* create new image with backing file */
2463 bdrv_img_create(target
, format
,
2465 source
->drv
->format_name
,
2466 NULL
, size
, flags
, &local_err
, false);
2474 error_propagate(errp
, local_err
);
2478 if (has_node_name
) {
2479 options
= qdict_new();
2480 qdict_put(options
, "node-name", qstring_from_str(node_name
));
2483 /* Mirroring takes care of copy-on-write using the source's backing
2487 ret
= bdrv_open(&target_bs
, target
, NULL
, options
,
2488 flags
| BDRV_O_NO_BACKING
, drv
, &local_err
);
2490 error_propagate(errp
, local_err
);
2494 bdrv_set_aio_context(target_bs
, aio_context
);
2496 /* pass the node name to replace to mirror start since it's loose coupling
2497 * and will allow to check whether the node still exist at mirror completion
2499 mirror_start(bs
, target_bs
,
2500 has_replaces
? replaces
: NULL
,
2501 speed
, granularity
, buf_size
, sync
,
2502 on_source_error
, on_target_error
,
2503 block_job_cb
, bs
, &local_err
);
2504 if (local_err
!= NULL
) {
2505 bdrv_unref(target_bs
);
2506 error_propagate(errp
, local_err
);
2511 aio_context_release(aio_context
);
2514 /* Get the block job for a given device name and acquire its AioContext */
2515 static BlockJob
*find_block_job(const char *device
, AioContext
**aio_context
)
2517 BlockDriverState
*bs
;
2519 bs
= bdrv_find(device
);
2524 *aio_context
= bdrv_get_aio_context(bs
);
2525 aio_context_acquire(*aio_context
);
2528 aio_context_release(*aio_context
);
2535 *aio_context
= NULL
;
2539 void qmp_block_job_set_speed(const char *device
, int64_t speed
, Error
**errp
)
2541 AioContext
*aio_context
;
2542 BlockJob
*job
= find_block_job(device
, &aio_context
);
2545 error_set(errp
, QERR_BLOCK_JOB_NOT_ACTIVE
, device
);
2549 block_job_set_speed(job
, speed
, errp
);
2550 aio_context_release(aio_context
);
2553 void qmp_block_job_cancel(const char *device
,
2554 bool has_force
, bool force
, Error
**errp
)
2556 AioContext
*aio_context
;
2557 BlockJob
*job
= find_block_job(device
, &aio_context
);
2560 error_set(errp
, QERR_BLOCK_JOB_NOT_ACTIVE
, device
);
2568 if (job
->paused
&& !force
) {
2569 error_setg(errp
, "The block job for device '%s' is currently paused",
2574 trace_qmp_block_job_cancel(job
);
2575 block_job_cancel(job
);
2577 aio_context_release(aio_context
);
2580 void qmp_block_job_pause(const char *device
, Error
**errp
)
2582 AioContext
*aio_context
;
2583 BlockJob
*job
= find_block_job(device
, &aio_context
);
2586 error_set(errp
, QERR_BLOCK_JOB_NOT_ACTIVE
, device
);
2590 trace_qmp_block_job_pause(job
);
2591 block_job_pause(job
);
2592 aio_context_release(aio_context
);
2595 void qmp_block_job_resume(const char *device
, Error
**errp
)
2597 AioContext
*aio_context
;
2598 BlockJob
*job
= find_block_job(device
, &aio_context
);
2601 error_set(errp
, QERR_BLOCK_JOB_NOT_ACTIVE
, device
);
2605 trace_qmp_block_job_resume(job
);
2606 block_job_resume(job
);
2607 aio_context_release(aio_context
);
2610 void qmp_block_job_complete(const char *device
, Error
**errp
)
2612 AioContext
*aio_context
;
2613 BlockJob
*job
= find_block_job(device
, &aio_context
);
2616 error_set(errp
, QERR_BLOCK_JOB_NOT_ACTIVE
, device
);
2620 trace_qmp_block_job_complete(job
);
2621 block_job_complete(job
, errp
);
2622 aio_context_release(aio_context
);
2625 void qmp_change_backing_file(const char *device
,
2626 const char *image_node_name
,
2627 const char *backing_file
,
2630 BlockDriverState
*bs
= NULL
;
2631 AioContext
*aio_context
;
2632 BlockDriverState
*image_bs
= NULL
;
2633 Error
*local_err
= NULL
;
2638 /* find the top layer BDS of the chain */
2639 bs
= bdrv_find(device
);
2641 error_set(errp
, QERR_DEVICE_NOT_FOUND
, device
);
2645 aio_context
= bdrv_get_aio_context(bs
);
2646 aio_context_acquire(aio_context
);
2648 image_bs
= bdrv_lookup_bs(NULL
, image_node_name
, &local_err
);
2650 error_propagate(errp
, local_err
);
2655 error_setg(errp
, "image file not found");
2659 if (bdrv_find_base(image_bs
) == image_bs
) {
2660 error_setg(errp
, "not allowing backing file change on an image "
2661 "without a backing file");
2665 /* even though we are not necessarily operating on bs, we need it to
2666 * determine if block ops are currently prohibited on the chain */
2667 if (bdrv_op_is_blocked(bs
, BLOCK_OP_TYPE_CHANGE
, errp
)) {
2671 /* final sanity check */
2672 if (!bdrv_chain_contains(bs
, image_bs
)) {
2673 error_setg(errp
, "'%s' and image file are not in the same chain",
2678 /* if not r/w, reopen to make r/w */
2679 open_flags
= image_bs
->open_flags
;
2680 ro
= bdrv_is_read_only(image_bs
);
2683 bdrv_reopen(image_bs
, open_flags
| BDRV_O_RDWR
, &local_err
);
2685 error_propagate(errp
, local_err
);
2690 ret
= bdrv_change_backing_file(image_bs
, backing_file
,
2691 image_bs
->drv
? image_bs
->drv
->format_name
: "");
2694 error_setg_errno(errp
, -ret
, "Could not change backing file to '%s'",
2696 /* don't exit here, so we can try to restore open flags if
2701 bdrv_reopen(image_bs
, open_flags
, &local_err
);
2703 error_propagate(errp
, local_err
); /* will preserve prior errp */
2708 aio_context_release(aio_context
);
2711 void qmp_blockdev_add(BlockdevOptions
*options
, Error
**errp
)
2713 QmpOutputVisitor
*ov
= qmp_output_visitor_new();
2717 Error
*local_err
= NULL
;
2719 /* Require an ID in the top level */
2720 if (!options
->has_id
) {
2721 error_setg(errp
, "Block device needs an ID");
2725 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
2726 * cache.direct=false instead of silently switching to aio=threads, except
2727 * when called from drive_new().
2729 * For now, simply forbidding the combination for all drivers will do. */
2730 if (options
->has_aio
&& options
->aio
== BLOCKDEV_AIO_OPTIONS_NATIVE
) {
2731 bool direct
= options
->has_cache
&&
2732 options
->cache
->has_direct
&&
2733 options
->cache
->direct
;
2735 error_setg(errp
, "aio=native requires cache.direct=true");
2740 visit_type_BlockdevOptions(qmp_output_get_visitor(ov
),
2741 &options
, NULL
, &local_err
);
2743 error_propagate(errp
, local_err
);
2747 obj
= qmp_output_get_qobject(ov
);
2748 qdict
= qobject_to_qdict(obj
);
2750 qdict_flatten(qdict
);
2752 blk
= blockdev_init(NULL
, qdict
, &local_err
);
2754 error_propagate(errp
, local_err
);
2758 if (bdrv_key_required(blk_bs(blk
))) {
2760 error_setg(errp
, "blockdev-add doesn't support encrypted devices");
2765 qmp_output_visitor_cleanup(ov
);
2768 BlockJobInfoList
*qmp_query_block_jobs(Error
**errp
)
2770 BlockJobInfoList
*head
= NULL
, **p_next
= &head
;
2771 BlockDriverState
*bs
;
2773 for (bs
= bdrv_next(NULL
); bs
; bs
= bdrv_next(bs
)) {
2774 AioContext
*aio_context
= bdrv_get_aio_context(bs
);
2776 aio_context_acquire(aio_context
);
2779 BlockJobInfoList
*elem
= g_new0(BlockJobInfoList
, 1);
2780 elem
->value
= block_job_query(bs
->job
);
2782 p_next
= &elem
->next
;
2785 aio_context_release(aio_context
);
2791 QemuOptsList qemu_common_drive_opts
= {
2793 .head
= QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts
.head
),
2797 .type
= QEMU_OPT_BOOL
,
2798 .help
= "enable/disable snapshot mode",
2801 .type
= QEMU_OPT_STRING
,
2802 .help
= "discard operation (ignore/off, unmap/on)",
2804 .name
= "cache.writeback",
2805 .type
= QEMU_OPT_BOOL
,
2806 .help
= "enables writeback mode for any caches",
2808 .name
= "cache.direct",
2809 .type
= QEMU_OPT_BOOL
,
2810 .help
= "enables use of O_DIRECT (bypass the host page cache)",
2812 .name
= "cache.no-flush",
2813 .type
= QEMU_OPT_BOOL
,
2814 .help
= "ignore any flush requests for the device",
2817 .type
= QEMU_OPT_STRING
,
2818 .help
= "host AIO implementation (threads, native)",
2821 .type
= QEMU_OPT_STRING
,
2822 .help
= "disk format (raw, qcow2, ...)",
2825 .type
= QEMU_OPT_STRING
,
2826 .help
= "read error action",
2829 .type
= QEMU_OPT_STRING
,
2830 .help
= "write error action",
2832 .name
= "read-only",
2833 .type
= QEMU_OPT_BOOL
,
2834 .help
= "open drive file as read-only",
2836 .name
= "throttling.iops-total",
2837 .type
= QEMU_OPT_NUMBER
,
2838 .help
= "limit total I/O operations per second",
2840 .name
= "throttling.iops-read",
2841 .type
= QEMU_OPT_NUMBER
,
2842 .help
= "limit read operations per second",
2844 .name
= "throttling.iops-write",
2845 .type
= QEMU_OPT_NUMBER
,
2846 .help
= "limit write operations per second",
2848 .name
= "throttling.bps-total",
2849 .type
= QEMU_OPT_NUMBER
,
2850 .help
= "limit total bytes per second",
2852 .name
= "throttling.bps-read",
2853 .type
= QEMU_OPT_NUMBER
,
2854 .help
= "limit read bytes per second",
2856 .name
= "throttling.bps-write",
2857 .type
= QEMU_OPT_NUMBER
,
2858 .help
= "limit write bytes per second",
2860 .name
= "throttling.iops-total-max",
2861 .type
= QEMU_OPT_NUMBER
,
2862 .help
= "I/O operations burst",
2864 .name
= "throttling.iops-read-max",
2865 .type
= QEMU_OPT_NUMBER
,
2866 .help
= "I/O operations read burst",
2868 .name
= "throttling.iops-write-max",
2869 .type
= QEMU_OPT_NUMBER
,
2870 .help
= "I/O operations write burst",
2872 .name
= "throttling.bps-total-max",
2873 .type
= QEMU_OPT_NUMBER
,
2874 .help
= "total bytes burst",
2876 .name
= "throttling.bps-read-max",
2877 .type
= QEMU_OPT_NUMBER
,
2878 .help
= "total bytes read burst",
2880 .name
= "throttling.bps-write-max",
2881 .type
= QEMU_OPT_NUMBER
,
2882 .help
= "total bytes write burst",
2884 .name
= "throttling.iops-size",
2885 .type
= QEMU_OPT_NUMBER
,
2886 .help
= "when limiting by iops max size of an I/O in bytes",
2888 .name
= "copy-on-read",
2889 .type
= QEMU_OPT_BOOL
,
2890 .help
= "copy read data from backing file into image file",
2892 .name
= "detect-zeroes",
2893 .type
= QEMU_OPT_STRING
,
2894 .help
= "try to optimize zero writes (off, on, unmap)",
2896 { /* end of list */ }
2900 QemuOptsList qemu_drive_opts
= {
2902 .head
= QTAILQ_HEAD_INITIALIZER(qemu_drive_opts
.head
),
2905 * no elements => accept any params
2906 * validation will happen later
2908 { /* end of list */ }