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"
51 #include "tizen/src/util/maru_err_table.h"
54 static const char *const if_name[IF_COUNT] = {
58 [IF_FLOPPY] = "floppy",
59 [IF_PFLASH] = "pflash",
62 [IF_VIRTIO] = "virtio",
66 static int if_max_devs[IF_COUNT] = {
68 * Do not change these numbers! They govern how drive option
69 * index maps to unit and bus. That mapping is ABI.
71 * All controllers used to imlement if=T drives need to support
72 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
73 * Otherwise, some index values map to "impossible" bus, unit
76 * For instance, if you change [IF_SCSI] to 255, -drive
77 * if=scsi,index=12 no longer means bus=1,unit=5, but
78 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
79 * the drive can't be set up. Regression.
86 * Boards may call this to offer board-by-board overrides
87 * of the default, global values.
89 void override_max_devs(BlockInterfaceType type, int max_devs)
98 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
99 dinfo = blk_legacy_dinfo(blk);
100 if (dinfo->type == type) {
101 fprintf(stderr, "Cannot override units-per-bus property of"
102 " the %s interface, because a drive of that type has"
103 " already been added.\n", if_name[type]);
104 g_assert_not_reached();
108 if_max_devs[type] = max_devs;
112 * We automatically delete the drive when a device using it gets
113 * unplugged. Questionable feature, but we can't just drop it.
114 * Device models call blockdev_mark_auto_del() to schedule the
115 * automatic deletion, and generic qdev code calls blockdev_auto_del()
116 * when deletion is actually safe.
118 void blockdev_mark_auto_del(BlockBackend *blk)
120 DriveInfo *dinfo = blk_legacy_dinfo(blk);
121 BlockDriverState *bs = blk_bs(blk);
122 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);
140 void blockdev_auto_del(BlockBackend *blk)
142 DriveInfo *dinfo = blk_legacy_dinfo(blk);
144 if (dinfo && dinfo->auto_del) {
150 * Returns the current mapping of how many units per bus
151 * a particular interface can support.
153 * A positive integer indicates n units per bus.
154 * 0 implies the mapping has not been established.
155 * -1 indicates an invalid BlockInterfaceType was given.
157 int drive_get_max_devs(BlockInterfaceType type)
159 if (type >= IF_IDE && type < IF_COUNT) {
160 return if_max_devs[type];
166 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
168 int max_devs = if_max_devs[type];
169 return max_devs ? index / max_devs : 0;
172 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
174 int max_devs = if_max_devs[type];
175 return max_devs ? index % max_devs : index;
178 QemuOpts *drive_def(const char *optstr)
180 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
183 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]);
197 snprintf(buf, sizeof(buf), "%d", index);
198 qemu_opt_set(opts, "index", buf);
201 qemu_opt_set(opts, "file", file);
205 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
210 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
211 dinfo = blk_legacy_dinfo(blk);
212 if (dinfo && dinfo->type == type
213 && dinfo->bus == bus && dinfo->unit == unit) {
221 bool drive_check_orphaned(void)
227 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
228 dinfo = blk_legacy_dinfo(blk);
229 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
230 /* Unless this is a default drive, this may be an oversight. */
231 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
232 dinfo->type != IF_NONE) {
233 fprintf(stderr, "Warning: Orphaned drive without device: "
234 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
235 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type],
236 dinfo->bus, dinfo->unit);
244 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
246 return drive_get(type,
247 drive_index_to_bus_id(type, index),
248 drive_index_to_unit_id(type, index));
251 int drive_get_max_bus(BlockInterfaceType type)
258 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
259 dinfo = blk_legacy_dinfo(blk);
260 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
261 max_bus = dinfo->bus;
267 /* Get a block device. This should only be used for single-drive devices
268 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
270 DriveInfo *drive_get_next(BlockInterfaceType type)
272 static int next_block_unit[IF_COUNT];
274 return drive_get(type, 0, next_block_unit[type]++);
277 static void bdrv_format_print(void *opaque, const char *name)
279 error_printf(" %s", name);
284 BlockDriverState *bs;
287 static void bdrv_put_ref_bh(void *opaque)
289 BDRVPutRefBH *s = opaque;
292 qemu_bh_delete(s->bh);
297 * Release a BDS reference in a BH
299 * It is not safe to use bdrv_unref() from a callback function when the callers
300 * still need the BlockDriverState. In such cases we schedule a BH to release
303 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
307 s = g_new(BDRVPutRefBH, 1);
308 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
310 qemu_bh_schedule(s->bh);
313 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
315 if (!strcmp(buf, "ignore")) {
316 return BLOCKDEV_ON_ERROR_IGNORE;
317 } else if (!is_read && !strcmp(buf, "enospc")) {
318 return BLOCKDEV_ON_ERROR_ENOSPC;
319 } else if (!strcmp(buf, "stop")) {
320 return BLOCKDEV_ON_ERROR_STOP;
321 } else if (!strcmp(buf, "report")) {
322 return BLOCKDEV_ON_ERROR_REPORT;
324 error_setg(errp, "'%s' invalid %s error action",
325 buf, is_read ? "read" : "write");
330 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
332 if (throttle_conflicting(cfg)) {
333 error_setg(errp, "bps/iops/max total values and read/write values"
334 " cannot be used at the same time");
338 if (!throttle_is_valid(cfg)) {
339 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
346 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
348 /* Takes the ownership of bs_opts */
349 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
355 int on_read_error, on_write_error;
357 BlockDriverState *bs;
365 bool has_driver_specific_opts;
366 BlockdevDetectZeroesOptions detect_zeroes;
367 BlockDriver *drv = NULL;
369 /* Check common options by copying from bs_opts to opts, all other options
370 * stay in bs_opts for processing by bdrv_open(). */
371 id = qdict_get_try_str(bs_opts, "id");
372 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
374 error_propagate(errp, error);
378 qemu_opts_absorb_qdict(opts, bs_opts, &error);
380 error_propagate(errp, error);
385 qdict_del(bs_opts, "id");
388 has_driver_specific_opts = !!qdict_size(bs_opts);
390 /* extract parameters */
391 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
392 ro = qemu_opt_get_bool(opts, "read-only", 0);
393 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
395 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
396 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
397 error_setg(errp, "invalid discard option");
402 if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
403 bdrv_flags |= BDRV_O_CACHE_WB;
405 if (qemu_opt_get_bool(opts, "cache.direct", false)) {
406 bdrv_flags |= BDRV_O_NOCACHE;
408 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
409 bdrv_flags |= BDRV_O_NO_FLUSH;
412 #ifdef CONFIG_LINUX_AIO
413 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
414 if (!strcmp(buf, "native")) {
415 bdrv_flags |= BDRV_O_NATIVE_AIO;
416 } else if (!strcmp(buf, "threads")) {
417 /* this is the default */
419 error_setg(errp, "invalid aio option");
425 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
426 if (is_help_option(buf)) {
427 error_printf("Supported formats:");
428 bdrv_iterate_format(bdrv_format_print, NULL);
433 drv = bdrv_find_format(buf);
435 error_setg(errp, "'%s' invalid format", buf);
440 /* disk I/O throttling */
441 memset(&cfg, 0, sizeof(cfg));
442 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
443 qemu_opt_get_number(opts, "throttling.bps-total", 0);
444 cfg.buckets[THROTTLE_BPS_READ].avg =
445 qemu_opt_get_number(opts, "throttling.bps-read", 0);
446 cfg.buckets[THROTTLE_BPS_WRITE].avg =
447 qemu_opt_get_number(opts, "throttling.bps-write", 0);
448 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
449 qemu_opt_get_number(opts, "throttling.iops-total", 0);
450 cfg.buckets[THROTTLE_OPS_READ].avg =
451 qemu_opt_get_number(opts, "throttling.iops-read", 0);
452 cfg.buckets[THROTTLE_OPS_WRITE].avg =
453 qemu_opt_get_number(opts, "throttling.iops-write", 0);
455 cfg.buckets[THROTTLE_BPS_TOTAL].max =
456 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
457 cfg.buckets[THROTTLE_BPS_READ].max =
458 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
459 cfg.buckets[THROTTLE_BPS_WRITE].max =
460 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
461 cfg.buckets[THROTTLE_OPS_TOTAL].max =
462 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
463 cfg.buckets[THROTTLE_OPS_READ].max =
464 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
465 cfg.buckets[THROTTLE_OPS_WRITE].max =
466 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
468 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
470 if (!check_throttle_config(&cfg, &error)) {
471 error_propagate(errp, error);
475 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
476 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
477 on_write_error = parse_block_error_action(buf, 0, &error);
479 error_propagate(errp, error);
484 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
485 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
486 on_read_error = parse_block_error_action(buf, 1, &error);
488 error_propagate(errp, error);
494 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
495 qemu_opt_get(opts, "detect-zeroes"),
496 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
497 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
500 error_propagate(errp, error);
504 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
505 !(bdrv_flags & BDRV_O_UNMAP)) {
506 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
507 "without setting discard operation to unmap");
512 blk = blk_new_with_bs(qemu_opts_id(opts), errp);
517 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
519 bs->detect_zeroes = detect_zeroes;
521 bdrv_set_on_error(bs, on_read_error, on_write_error);
523 /* disk I/O throttling */
524 if (throttle_enabled(&cfg)) {
525 bdrv_io_limits_enable(bs);
526 bdrv_set_io_limits(bs, &cfg);
529 if (!file || !*file) {
530 if (has_driver_specific_opts) {
539 /* always use cache=unsafe with snapshot */
540 bdrv_flags &= ~BDRV_O_CACHE_MASK;
541 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
545 bdrv_flags |= BDRV_O_COPY_ON_READ;
548 if (runstate_check(RUN_STATE_INMIGRATE)) {
549 bdrv_flags |= BDRV_O_INCOMING;
552 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
555 ret = bdrv_open(&bs, file, NULL, bs_opts, bdrv_flags, drv, &error);
556 assert(bs == blk_bs(blk));
560 char *path = get_canonical_path(file);
561 char *msg = g_strdup_printf("Failed to load disk file from the following path. Check if the file is corrupted or missing.\n\n%s", path);
563 start_simple_client(msg);
569 error_setg(errp, "could not open disk image %s: %s",
570 file ?: blk_name(blk), error_get_pretty(error));
575 if (bdrv_key_required(bs)) {
593 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
598 value = qemu_opt_get(opts, from);
600 if (qemu_opt_find(opts, to)) {
601 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
602 "same time", to, from);
607 /* rename all items in opts */
608 while ((value = qemu_opt_get(opts, from))) {
609 qemu_opt_set(opts, to, value);
610 qemu_opt_unset(opts, from);
614 QemuOptsList qemu_legacy_drive_opts = {
616 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
620 .type = QEMU_OPT_NUMBER,
621 .help = "bus number",
624 .type = QEMU_OPT_NUMBER,
625 .help = "unit number (i.e. lun for scsi)",
628 .type = QEMU_OPT_NUMBER,
629 .help = "index number",
632 .type = QEMU_OPT_STRING,
633 .help = "media type (disk, cdrom)",
636 .type = QEMU_OPT_STRING,
637 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
640 .type = QEMU_OPT_NUMBER,
641 .help = "number of cylinders (ide disk geometry)",
644 .type = QEMU_OPT_NUMBER,
645 .help = "number of heads (ide disk geometry)",
648 .type = QEMU_OPT_NUMBER,
649 .help = "number of sectors (ide disk geometry)",
652 .type = QEMU_OPT_STRING,
653 .help = "chs translation (auto, lba, none)",
656 .type = QEMU_OPT_BOOL,
657 .help = "(deprecated, ignored)",
660 .type = QEMU_OPT_STRING,
661 .help = "pci address (virtio only)",
664 .type = QEMU_OPT_STRING,
665 .help = "disk serial number",
668 .type = QEMU_OPT_STRING,
672 /* Options that are passed on, but have special semantics with -drive */
675 .type = QEMU_OPT_BOOL,
676 .help = "open drive file as read-only",
679 .type = QEMU_OPT_STRING,
680 .help = "read error action",
683 .type = QEMU_OPT_STRING,
684 .help = "write error action",
686 .name = "copy-on-read",
687 .type = QEMU_OPT_BOOL,
688 .help = "copy read data from backing file into image file",
691 { /* end of list */ }
695 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
699 DriveInfo *dinfo = NULL;
701 QemuOpts *legacy_opts;
702 DriveMediaType media = MEDIA_DISK;
703 BlockInterfaceType type;
704 int cyls, heads, secs, translation;
705 int max_devs, bus_id, unit_id, index;
707 const char *werror, *rerror;
708 bool read_only = false;
711 const char *filename;
712 Error *local_err = NULL;
715 /* Change legacy command line options into QMP ones */
716 static const struct {
720 { "iops", "throttling.iops-total" },
721 { "iops_rd", "throttling.iops-read" },
722 { "iops_wr", "throttling.iops-write" },
724 { "bps", "throttling.bps-total" },
725 { "bps_rd", "throttling.bps-read" },
726 { "bps_wr", "throttling.bps-write" },
728 { "iops_max", "throttling.iops-total-max" },
729 { "iops_rd_max", "throttling.iops-read-max" },
730 { "iops_wr_max", "throttling.iops-write-max" },
732 { "bps_max", "throttling.bps-total-max" },
733 { "bps_rd_max", "throttling.bps-read-max" },
734 { "bps_wr_max", "throttling.bps-write-max" },
736 { "iops_size", "throttling.iops-size" },
738 { "readonly", "read-only" },
741 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
742 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
745 error_report("%s", error_get_pretty(local_err));
746 error_free(local_err);
751 value = qemu_opt_get(all_opts, "cache");
755 if (bdrv_parse_cache_flags(value, &flags) != 0) {
756 error_report("invalid cache option");
760 /* Specific options take precedence */
761 if (!qemu_opt_get(all_opts, "cache.writeback")) {
762 qemu_opt_set_bool(all_opts, "cache.writeback",
763 !!(flags & BDRV_O_CACHE_WB));
765 if (!qemu_opt_get(all_opts, "cache.direct")) {
766 qemu_opt_set_bool(all_opts, "cache.direct",
767 !!(flags & BDRV_O_NOCACHE));
769 if (!qemu_opt_get(all_opts, "cache.no-flush")) {
770 qemu_opt_set_bool(all_opts, "cache.no-flush",
771 !!(flags & BDRV_O_NO_FLUSH));
773 qemu_opt_unset(all_opts, "cache");
776 /* Get a QDict for processing the options */
777 bs_opts = qdict_new();
778 qemu_opts_to_qdict(all_opts, bs_opts);
780 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
782 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
784 error_report("%s", error_get_pretty(local_err));
785 error_free(local_err);
789 /* Deprecated option boot=[on|off] */
790 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
791 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
792 "ignored. Future versions will reject this parameter. Please "
793 "update your scripts.\n");
797 value = qemu_opt_get(legacy_opts, "media");
799 if (!strcmp(value, "disk")) {
801 } else if (!strcmp(value, "cdrom")) {
805 error_report("'%s' invalid media", value);
810 /* copy-on-read is disabled with a warning for read-only devices */
811 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
812 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
814 if (read_only && copy_on_read) {
815 error_report("warning: disabling copy-on-read on read-only drive");
816 copy_on_read = false;
819 qdict_put(bs_opts, "read-only",
820 qstring_from_str(read_only ? "on" : "off"));
821 qdict_put(bs_opts, "copy-on-read",
822 qstring_from_str(copy_on_read ? "on" :"off"));
824 /* Controller type */
825 value = qemu_opt_get(legacy_opts, "if");
828 type < IF_COUNT && strcmp(value, if_name[type]);
831 if (type == IF_COUNT) {
832 error_report("unsupported bus type '%s'", value);
836 type = block_default_type;
840 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
841 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
842 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
844 if (cyls || heads || secs) {
846 error_report("invalid physical cyls number");
850 error_report("invalid physical heads number");
854 error_report("invalid physical secs number");
859 translation = BIOS_ATA_TRANSLATION_AUTO;
860 value = qemu_opt_get(legacy_opts, "trans");
863 error_report("'%s' trans must be used with cyls, heads and secs",
867 if (!strcmp(value, "none")) {
868 translation = BIOS_ATA_TRANSLATION_NONE;
869 } else if (!strcmp(value, "lba")) {
870 translation = BIOS_ATA_TRANSLATION_LBA;
871 } else if (!strcmp(value, "large")) {
872 translation = BIOS_ATA_TRANSLATION_LARGE;
873 } else if (!strcmp(value, "rechs")) {
874 translation = BIOS_ATA_TRANSLATION_RECHS;
875 } else if (!strcmp(value, "auto")) {
876 translation = BIOS_ATA_TRANSLATION_AUTO;
878 error_report("'%s' invalid translation type", value);
883 if (media == MEDIA_CDROM) {
884 if (cyls || secs || heads) {
885 error_report("CHS can't be set with media=cdrom");
890 /* Device address specified by bus/unit or index.
891 * If none was specified, try to find the first free one. */
892 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
893 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
894 index = qemu_opt_get_number(legacy_opts, "index", -1);
896 max_devs = if_max_devs[type];
899 if (bus_id != 0 || unit_id != -1) {
900 error_report("index cannot be used with bus and unit");
903 bus_id = drive_index_to_bus_id(type, index);
904 unit_id = drive_index_to_unit_id(type, index);
909 while (drive_get(type, bus_id, unit_id) != NULL) {
911 if (max_devs && unit_id >= max_devs) {
918 if (max_devs && unit_id >= max_devs) {
919 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
923 if (drive_get(type, bus_id, unit_id) != NULL) {
924 error_report("drive with bus=%d, unit=%d (index=%d) exists",
925 bus_id, unit_id, index);
930 serial = qemu_opt_get(legacy_opts, "serial");
932 /* no id supplied -> create one */
933 if (qemu_opts_id(all_opts) == NULL) {
935 const char *mediastr = "";
936 if (type == IF_IDE || type == IF_SCSI) {
937 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
940 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
943 new_id = g_strdup_printf("%s%s%i", if_name[type],
946 qdict_put(bs_opts, "id", qstring_from_str(new_id));
950 /* Add virtio block device */
951 devaddr = qemu_opt_get(legacy_opts, "addr");
952 if (devaddr && type != IF_VIRTIO) {
953 error_report("addr is not supported by this bus type");
957 if (type == IF_VIRTIO) {
959 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
961 if (arch_type == QEMU_ARCH_S390X) {
962 qemu_opt_set(devopts, "driver", "virtio-blk-s390");
964 qemu_opt_set(devopts, "driver", "virtio-blk-pci");
966 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"));
968 qemu_opt_set(devopts, "addr", devaddr);
972 filename = qemu_opt_get(legacy_opts, "file");
974 /* Check werror/rerror compatibility with if=... */
975 werror = qemu_opt_get(legacy_opts, "werror");
976 if (werror != NULL) {
977 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
979 error_report("werror is not supported by this bus type");
982 qdict_put(bs_opts, "werror", qstring_from_str(werror));
985 rerror = qemu_opt_get(legacy_opts, "rerror");
986 if (rerror != NULL) {
987 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
989 error_report("rerror is not supported by this bus type");
992 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
995 /* Actual block device init: Functionality shared with blockdev-add */
996 blk = blockdev_init(filename, bs_opts, &local_err);
1000 error_report("%s", error_get_pretty(local_err));
1001 error_free(local_err);
1008 /* Create legacy DriveInfo */
1009 dinfo = g_malloc0(sizeof(*dinfo));
1010 dinfo->opts = all_opts;
1013 dinfo->heads = heads;
1015 dinfo->trans = translation;
1018 dinfo->bus = bus_id;
1019 dinfo->unit = unit_id;
1020 dinfo->devaddr = devaddr;
1021 dinfo->serial = g_strdup(serial);
1023 blk_set_legacy_dinfo(blk, dinfo);
1030 dinfo->media_cd = media == MEDIA_CDROM;
1037 qemu_opts_del(legacy_opts);
1042 void do_commit(Monitor *mon, const QDict *qdict)
1044 const char *device = qdict_get_str(qdict, "device");
1045 BlockDriverState *bs;
1048 if (!strcmp(device, "all")) {
1049 ret = bdrv_commit_all();
1051 bs = bdrv_find(device);
1053 monitor_printf(mon, "Device '%s' not found\n", device);
1056 ret = bdrv_commit(bs);
1059 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1064 static void blockdev_do_action(int kind, void *data, Error **errp)
1066 TransactionAction action;
1067 TransactionActionList list;
1071 list.value = &action;
1073 qmp_transaction(&list, errp);
1076 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1077 bool has_node_name, const char *node_name,
1078 const char *snapshot_file,
1079 bool has_snapshot_node_name,
1080 const char *snapshot_node_name,
1081 bool has_format, const char *format,
1082 bool has_mode, NewImageMode mode, Error **errp)
1084 BlockdevSnapshot snapshot = {
1085 .has_device = has_device,
1086 .device = (char *) device,
1087 .has_node_name = has_node_name,
1088 .node_name = (char *) node_name,
1089 .snapshot_file = (char *) snapshot_file,
1090 .has_snapshot_node_name = has_snapshot_node_name,
1091 .snapshot_node_name = (char *) snapshot_node_name,
1092 .has_format = has_format,
1093 .format = (char *) format,
1094 .has_mode = has_mode,
1097 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1101 void qmp_blockdev_snapshot_internal_sync(const char *device,
1105 BlockdevSnapshotInternal snapshot = {
1106 .device = (char *) device,
1107 .name = (char *) name
1110 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1114 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1121 BlockDriverState *bs = bdrv_find(device);
1122 QEMUSnapshotInfo sn;
1123 Error *local_err = NULL;
1124 SnapshotInfo *info = NULL;
1128 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1141 error_setg(errp, "Name or id must be provided");
1145 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1147 error_propagate(errp, local_err);
1152 "Snapshot with id '%s' and name '%s' does not exist on "
1154 STR_OR_NULL(id), STR_OR_NULL(name), device);
1158 bdrv_snapshot_delete(bs, id, name, &local_err);
1160 error_propagate(errp, local_err);
1164 info = g_new0(SnapshotInfo, 1);
1165 info->id = g_strdup(sn.id_str);
1166 info->name = g_strdup(sn.name);
1167 info->date_nsec = sn.date_nsec;
1168 info->date_sec = sn.date_sec;
1169 info->vm_state_size = sn.vm_state_size;
1170 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1171 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1176 /* New and old BlockDriverState structs for group snapshots */
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 QEMUSnapshotInfo sn;
1211 } InternalSnapshotState;
1213 static void internal_snapshot_prepare(BlkTransactionState *common,
1216 Error *local_err = NULL;
1219 BlockDriverState *bs;
1220 QEMUSnapshotInfo old_sn, *sn;
1223 BlockdevSnapshotInternal *internal;
1224 InternalSnapshotState *state;
1227 g_assert(common->action->kind ==
1228 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1229 internal = common->action->blockdev_snapshot_internal_sync;
1230 state = DO_UPCAST(InternalSnapshotState, common, common);
1232 /* 1. parse input */
1233 device = internal->device;
1234 name = internal->name;
1236 /* 2. check for validation */
1237 bs = bdrv_find(device);
1239 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1243 if (!bdrv_is_inserted(bs)) {
1244 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1248 if (bdrv_is_read_only(bs)) {
1249 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1253 if (!bdrv_can_snapshot(bs)) {
1254 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1255 bs->drv->format_name, device, "internal snapshot");
1259 if (!strlen(name)) {
1260 error_setg(errp, "Name is empty");
1264 /* check whether a snapshot with name exist */
1265 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1268 error_propagate(errp, local_err);
1272 "Snapshot with name '%s' already exists on device '%s'",
1277 /* 3. take the snapshot */
1279 pstrcpy(sn->name, sizeof(sn->name), name);
1280 qemu_gettimeofday(&tv);
1281 sn->date_sec = tv.tv_sec;
1282 sn->date_nsec = tv.tv_usec * 1000;
1283 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1285 ret1 = bdrv_snapshot_create(bs, sn);
1287 error_setg_errno(errp, -ret1,
1288 "Failed to create snapshot '%s' on device '%s'",
1293 /* 4. succeed, mark a snapshot is created */
1297 static void internal_snapshot_abort(BlkTransactionState *common)
1299 InternalSnapshotState *state =
1300 DO_UPCAST(InternalSnapshotState, common, common);
1301 BlockDriverState *bs = state->bs;
1302 QEMUSnapshotInfo *sn = &state->sn;
1303 Error *local_error = NULL;
1309 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1310 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1311 "device '%s' in abort: %s",
1314 bdrv_get_device_name(bs),
1315 error_get_pretty(local_error));
1316 error_free(local_error);
1320 /* external snapshot private data */
1321 typedef struct ExternalSnapshotState {
1322 BlkTransactionState common;
1323 BlockDriverState *old_bs;
1324 BlockDriverState *new_bs;
1325 } ExternalSnapshotState;
1327 static void external_snapshot_prepare(BlkTransactionState *common,
1332 QDict *options = NULL;
1333 Error *local_err = NULL;
1334 bool has_device = false;
1336 bool has_node_name = false;
1337 const char *node_name;
1338 bool has_snapshot_node_name = false;
1339 const char *snapshot_node_name;
1340 const char *new_image_file;
1341 const char *format = "qcow2";
1342 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1343 ExternalSnapshotState *state =
1344 DO_UPCAST(ExternalSnapshotState, common, common);
1345 TransactionAction *action = common->action;
1347 /* get parameters */
1348 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1350 has_device = action->blockdev_snapshot_sync->has_device;
1351 device = action->blockdev_snapshot_sync->device;
1352 has_node_name = action->blockdev_snapshot_sync->has_node_name;
1353 node_name = action->blockdev_snapshot_sync->node_name;
1354 has_snapshot_node_name =
1355 action->blockdev_snapshot_sync->has_snapshot_node_name;
1356 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1358 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1359 if (action->blockdev_snapshot_sync->has_format) {
1360 format = action->blockdev_snapshot_sync->format;
1362 if (action->blockdev_snapshot_sync->has_mode) {
1363 mode = action->blockdev_snapshot_sync->mode;
1366 /* start processing */
1367 drv = bdrv_find_format(format);
1369 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1373 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1374 has_node_name ? node_name : NULL,
1377 error_propagate(errp, local_err);
1381 if (has_node_name && !has_snapshot_node_name) {
1382 error_setg(errp, "New snapshot node name missing");
1386 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1387 error_setg(errp, "New snapshot node name already existing");
1391 if (!bdrv_is_inserted(state->old_bs)) {
1392 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1396 if (bdrv_op_is_blocked(state->old_bs,
1397 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1401 if (!bdrv_is_read_only(state->old_bs)) {
1402 if (bdrv_flush(state->old_bs)) {
1403 error_set(errp, QERR_IO_ERROR);
1408 if (!bdrv_is_first_non_filter(state->old_bs)) {
1409 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1413 flags = state->old_bs->open_flags;
1415 /* create new image w/backing file */
1416 if (mode != NEW_IMAGE_MODE_EXISTING) {
1417 bdrv_img_create(new_image_file, format,
1418 state->old_bs->filename,
1419 state->old_bs->drv->format_name,
1420 NULL, -1, flags, &local_err, false);
1422 error_propagate(errp, local_err);
1427 if (has_snapshot_node_name) {
1428 options = qdict_new();
1429 qdict_put(options, "node-name",
1430 qstring_from_str(snapshot_node_name));
1433 /* TODO Inherit bs->options or only take explicit options with an
1434 * extended QMP command? */
1435 assert(state->new_bs == NULL);
1436 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1437 flags | BDRV_O_NO_BACKING, drv, &local_err);
1438 /* We will manually add the backing_hd field to the bs later */
1440 error_propagate(errp, local_err);
1444 static void external_snapshot_commit(BlkTransactionState *common)
1446 ExternalSnapshotState *state =
1447 DO_UPCAST(ExternalSnapshotState, common, common);
1449 /* This removes our old bs and adds the new bs */
1450 bdrv_append(state->new_bs, state->old_bs);
1451 /* We don't need (or want) to use the transactional
1452 * bdrv_reopen_multiple() across all the entries at once, because we
1453 * don't want to abort all of them if one of them fails the reopen */
1454 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1458 static void external_snapshot_abort(BlkTransactionState *common)
1460 ExternalSnapshotState *state =
1461 DO_UPCAST(ExternalSnapshotState, common, common);
1462 if (state->new_bs) {
1463 bdrv_unref(state->new_bs);
1467 typedef struct DriveBackupState {
1468 BlkTransactionState common;
1469 BlockDriverState *bs;
1473 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1475 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1476 DriveBackup *backup;
1477 Error *local_err = NULL;
1479 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1480 backup = common->action->drive_backup;
1482 qmp_drive_backup(backup->device, backup->target,
1483 backup->has_format, backup->format,
1485 backup->has_mode, backup->mode,
1486 backup->has_speed, backup->speed,
1487 backup->has_on_source_error, backup->on_source_error,
1488 backup->has_on_target_error, backup->on_target_error,
1491 error_propagate(errp, local_err);
1497 state->bs = bdrv_find(backup->device);
1498 state->job = state->bs->job;
1501 static void drive_backup_abort(BlkTransactionState *common)
1503 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1504 BlockDriverState *bs = state->bs;
1506 /* Only cancel if it's the job we started */
1507 if (bs && bs->job && bs->job == state->job) {
1508 block_job_cancel_sync(bs->job);
1512 static void abort_prepare(BlkTransactionState *common, Error **errp)
1514 error_setg(errp, "Transaction aborted using Abort action");
1517 static void abort_commit(BlkTransactionState *common)
1519 g_assert_not_reached(); /* this action never succeeds */
1522 static const BdrvActionOps actions[] = {
1523 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1524 .instance_size = sizeof(ExternalSnapshotState),
1525 .prepare = external_snapshot_prepare,
1526 .commit = external_snapshot_commit,
1527 .abort = external_snapshot_abort,
1529 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1530 .instance_size = sizeof(DriveBackupState),
1531 .prepare = drive_backup_prepare,
1532 .abort = drive_backup_abort,
1534 [TRANSACTION_ACTION_KIND_ABORT] = {
1535 .instance_size = sizeof(BlkTransactionState),
1536 .prepare = abort_prepare,
1537 .commit = abort_commit,
1539 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1540 .instance_size = sizeof(InternalSnapshotState),
1541 .prepare = internal_snapshot_prepare,
1542 .abort = internal_snapshot_abort,
1547 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
1548 * then we do not pivot any of the devices in the group, and abandon the
1551 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1553 TransactionActionList *dev_entry = dev_list;
1554 BlkTransactionState *state, *next;
1555 Error *local_err = NULL;
1557 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1558 QSIMPLEQ_INIT(&snap_bdrv_states);
1560 /* drain all i/o before any snapshots */
1563 /* We don't do anything in this loop that commits us to the snapshot */
1564 while (NULL != dev_entry) {
1565 TransactionAction *dev_info = NULL;
1566 const BdrvActionOps *ops;
1568 dev_info = dev_entry->value;
1569 dev_entry = dev_entry->next;
1571 assert(dev_info->kind < ARRAY_SIZE(actions));
1573 ops = &actions[dev_info->kind];
1574 assert(ops->instance_size > 0);
1576 state = g_malloc0(ops->instance_size);
1578 state->action = dev_info;
1579 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1581 state->ops->prepare(state, &local_err);
1583 error_propagate(errp, local_err);
1584 goto delete_and_fail;
1588 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1589 if (state->ops->commit) {
1590 state->ops->commit(state);
1599 * failure, and it is all-or-none; abandon each new bs, and keep using
1600 * the original bs for all images
1602 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1603 if (state->ops->abort) {
1604 state->ops->abort(state);
1608 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1609 if (state->ops->clean) {
1610 state->ops->clean(state);
1617 static void eject_device(BlockBackend *blk, int force, Error **errp)
1619 BlockDriverState *bs = blk_bs(blk);
1621 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1624 if (!blk_dev_has_removable_media(blk)) {
1625 error_setg(errp, "Device '%s' is not removable",
1626 bdrv_get_device_name(bs));
1630 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
1631 blk_dev_eject_request(blk, force);
1633 error_setg(errp, "Device '%s' is locked",
1634 bdrv_get_device_name(bs));
1642 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1646 blk = blk_by_name(device);
1648 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1652 eject_device(blk, force, errp);
1655 void qmp_block_passwd(bool has_device, const char *device,
1656 bool has_node_name, const char *node_name,
1657 const char *password, Error **errp)
1659 Error *local_err = NULL;
1660 BlockDriverState *bs;
1663 bs = bdrv_lookup_bs(has_device ? device : NULL,
1664 has_node_name ? node_name : NULL,
1667 error_propagate(errp, local_err);
1671 err = bdrv_set_key(bs, password);
1672 if (err == -EINVAL) {
1673 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1675 } else if (err < 0) {
1676 error_set(errp, QERR_INVALID_PASSWORD);
1681 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1682 int bdrv_flags, BlockDriver *drv,
1683 const char *password, Error **errp)
1685 Error *local_err = NULL;
1688 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err);
1690 error_propagate(errp, local_err);
1694 if (bdrv_key_required(bs)) {
1696 if (bdrv_set_key(bs, password) < 0) {
1697 error_set(errp, QERR_INVALID_PASSWORD);
1700 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1701 bdrv_get_encrypted_filename(bs));
1703 } else if (password) {
1704 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1708 void qmp_change_blockdev(const char *device, const char *filename,
1709 const char *format, Error **errp)
1712 BlockDriverState *bs;
1713 BlockDriver *drv = NULL;
1717 blk = blk_by_name(device);
1719 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1725 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1727 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1732 eject_device(blk, 0, &err);
1734 error_propagate(errp, err);
1738 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1739 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1741 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1744 /* throttling disk I/O limits */
1745 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1752 bool has_bps_rd_max,
1754 bool has_bps_wr_max,
1758 bool has_iops_rd_max,
1759 int64_t iops_rd_max,
1760 bool has_iops_wr_max,
1761 int64_t iops_wr_max,
1763 int64_t iops_size, Error **errp)
1766 BlockDriverState *bs;
1767 AioContext *aio_context;
1769 bs = bdrv_find(device);
1771 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1775 memset(&cfg, 0, sizeof(cfg));
1776 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1777 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1778 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1780 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1781 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1782 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1785 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1787 if (has_bps_rd_max) {
1788 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1790 if (has_bps_wr_max) {
1791 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1794 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1796 if (has_iops_rd_max) {
1797 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1799 if (has_iops_wr_max) {
1800 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1803 if (has_iops_size) {
1804 cfg.op_size = iops_size;
1807 if (!check_throttle_config(&cfg, errp)) {
1811 aio_context = bdrv_get_aio_context(bs);
1812 aio_context_acquire(aio_context);
1814 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1815 bdrv_io_limits_enable(bs);
1816 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1817 bdrv_io_limits_disable(bs);
1820 if (bs->io_limits_enabled) {
1821 bdrv_set_io_limits(bs, &cfg);
1824 aio_context_release(aio_context);
1827 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1829 const char *id = qdict_get_str(qdict, "id");
1831 BlockDriverState *bs;
1832 AioContext *aio_context;
1833 Error *local_err = NULL;
1835 blk = blk_by_name(id);
1837 error_report("Device '%s' not found", id);
1842 if (!blk_legacy_dinfo(blk)) {
1843 error_report("Deleting device added with blockdev-add"
1844 " is not supported");
1848 aio_context = bdrv_get_aio_context(bs);
1849 aio_context_acquire(aio_context);
1851 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
1852 error_report("%s", error_get_pretty(local_err));
1853 error_free(local_err);
1854 aio_context_release(aio_context);
1858 /* quiesce block driver; prevent further io */
1863 /* if we have a device attached to this BlockDriverState
1864 * then we need to make the drive anonymous until the device
1865 * can be removed. If this is a drive with no device backing
1866 * then we can just get rid of the block driver state right here.
1868 if (blk_get_attached_dev(blk)) {
1869 blk_hide_on_behalf_of_do_drive_del(blk);
1870 /* Further I/O must not pause the guest */
1871 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1872 BLOCKDEV_ON_ERROR_REPORT);
1877 aio_context_release(aio_context);
1881 void qmp_block_resize(bool has_device, const char *device,
1882 bool has_node_name, const char *node_name,
1883 int64_t size, Error **errp)
1885 Error *local_err = NULL;
1886 BlockDriverState *bs;
1887 AioContext *aio_context;
1890 bs = bdrv_lookup_bs(has_device ? device : NULL,
1891 has_node_name ? node_name : NULL,
1894 error_propagate(errp, local_err);
1898 aio_context = bdrv_get_aio_context(bs);
1899 aio_context_acquire(aio_context);
1901 if (!bdrv_is_first_non_filter(bs)) {
1902 error_set(errp, QERR_FEATURE_DISABLED, "resize");
1907 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1911 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
1912 error_set(errp, QERR_DEVICE_IN_USE, device);
1916 /* complete all in-flight operations before resizing the device */
1919 ret = bdrv_truncate(bs, size);
1924 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1927 error_set(errp, QERR_UNSUPPORTED);
1930 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1933 error_set(errp, QERR_DEVICE_IN_USE, device);
1936 error_setg_errno(errp, -ret, "Could not resize");
1941 aio_context_release(aio_context);
1944 static void block_job_cb(void *opaque, int ret)
1946 /* Note that this function may be executed from another AioContext besides
1947 * the QEMU main loop. If you need to access anything that assumes the
1948 * QEMU global mutex, use a BH or introduce a mutex.
1951 BlockDriverState *bs = opaque;
1952 const char *msg = NULL;
1954 trace_block_job_cb(bs, bs->job, ret);
1959 msg = strerror(-ret);
1962 if (block_job_is_cancelled(bs->job)) {
1963 block_job_event_cancelled(bs->job);
1965 block_job_event_completed(bs->job, msg);
1968 bdrv_put_ref_bh_schedule(bs);
1971 void qmp_block_stream(const char *device,
1972 bool has_base, const char *base,
1973 bool has_backing_file, const char *backing_file,
1974 bool has_speed, int64_t speed,
1975 bool has_on_error, BlockdevOnError on_error,
1978 BlockDriverState *bs;
1979 BlockDriverState *base_bs = NULL;
1980 AioContext *aio_context;
1981 Error *local_err = NULL;
1982 const char *base_name = NULL;
1984 if (!has_on_error) {
1985 on_error = BLOCKDEV_ON_ERROR_REPORT;
1988 bs = bdrv_find(device);
1990 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1994 aio_context = bdrv_get_aio_context(bs);
1995 aio_context_acquire(aio_context);
1997 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2002 base_bs = bdrv_find_backing_image(bs, base);
2003 if (base_bs == NULL) {
2004 error_set(errp, QERR_BASE_NOT_FOUND, base);
2007 assert(bdrv_get_aio_context(base_bs) == aio_context);
2011 /* if we are streaming the entire chain, the result will have no backing
2012 * file, and specifying one is therefore an error */
2013 if (base_bs == NULL && has_backing_file) {
2014 error_setg(errp, "backing file specified, but streaming the "
2019 /* backing_file string overrides base bs filename */
2020 base_name = has_backing_file ? backing_file : base_name;
2022 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2023 on_error, block_job_cb, bs, &local_err);
2025 error_propagate(errp, local_err);
2029 trace_qmp_block_stream(bs, bs->job);
2032 aio_context_release(aio_context);
2035 void qmp_block_commit(const char *device,
2036 bool has_base, const char *base,
2037 bool has_top, const char *top,
2038 bool has_backing_file, const char *backing_file,
2039 bool has_speed, int64_t speed,
2042 BlockDriverState *bs;
2043 BlockDriverState *base_bs, *top_bs;
2044 AioContext *aio_context;
2045 Error *local_err = NULL;
2046 /* This will be part of the QMP command, if/when the
2047 * BlockdevOnError change for blkmirror makes it in
2049 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2056 * libvirt relies on the DeviceNotFound error class in order to probe for
2057 * live commit feature versions; for this to work, we must make sure to
2058 * perform the device lookup before any generic errors that may occur in a
2059 * scenario in which all optional arguments are omitted. */
2060 bs = bdrv_find(device);
2062 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2066 aio_context = bdrv_get_aio_context(bs);
2067 aio_context_acquire(aio_context);
2069 /* drain all i/o before commits */
2072 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, errp)) {
2076 /* default top_bs is the active layer */
2079 if (has_top && top) {
2080 if (strcmp(bs->filename, top) != 0) {
2081 top_bs = bdrv_find_backing_image(bs, top);
2085 if (top_bs == NULL) {
2086 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2090 assert(bdrv_get_aio_context(top_bs) == aio_context);
2092 if (has_base && base) {
2093 base_bs = bdrv_find_backing_image(top_bs, base);
2095 base_bs = bdrv_find_base(top_bs);
2098 if (base_bs == NULL) {
2099 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2103 assert(bdrv_get_aio_context(base_bs) == aio_context);
2105 /* Do not allow attempts to commit an image into itself */
2106 if (top_bs == base_bs) {
2107 error_setg(errp, "cannot commit an image into itself");
2112 if (has_backing_file) {
2113 error_setg(errp, "'backing-file' specified,"
2114 " but 'top' is the active layer");
2117 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2120 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2121 has_backing_file ? backing_file : NULL, &local_err);
2123 if (local_err != NULL) {
2124 error_propagate(errp, local_err);
2129 aio_context_release(aio_context);
2132 void qmp_drive_backup(const char *device, const char *target,
2133 bool has_format, const char *format,
2134 enum MirrorSyncMode sync,
2135 bool has_mode, enum NewImageMode mode,
2136 bool has_speed, int64_t speed,
2137 bool has_on_source_error, BlockdevOnError on_source_error,
2138 bool has_on_target_error, BlockdevOnError on_target_error,
2141 BlockDriverState *bs;
2142 BlockDriverState *target_bs;
2143 BlockDriverState *source = NULL;
2144 AioContext *aio_context;
2145 BlockDriver *drv = NULL;
2146 Error *local_err = NULL;
2154 if (!has_on_source_error) {
2155 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2157 if (!has_on_target_error) {
2158 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2161 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2164 bs = bdrv_find(device);
2166 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2170 aio_context = bdrv_get_aio_context(bs);
2171 aio_context_acquire(aio_context);
2173 if (!bdrv_is_inserted(bs)) {
2174 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2179 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2182 drv = bdrv_find_format(format);
2184 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2189 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2193 flags = bs->open_flags | BDRV_O_RDWR;
2195 /* See if we have a backing HD we can use to create our new image
2197 if (sync == MIRROR_SYNC_MODE_TOP) {
2198 source = bs->backing_hd;
2200 sync = MIRROR_SYNC_MODE_FULL;
2203 if (sync == MIRROR_SYNC_MODE_NONE) {
2207 size = bdrv_getlength(bs);
2209 error_setg_errno(errp, -size, "bdrv_getlength failed");
2213 if (mode != NEW_IMAGE_MODE_EXISTING) {
2214 assert(format && drv);
2216 bdrv_img_create(target, format, source->filename,
2217 source->drv->format_name, NULL,
2218 size, flags, &local_err, false);
2220 bdrv_img_create(target, format, NULL, NULL, NULL,
2221 size, flags, &local_err, false);
2226 error_propagate(errp, local_err);
2231 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
2233 error_propagate(errp, local_err);
2237 bdrv_set_aio_context(target_bs, aio_context);
2239 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
2240 block_job_cb, bs, &local_err);
2241 if (local_err != NULL) {
2242 bdrv_unref(target_bs);
2243 error_propagate(errp, local_err);
2248 aio_context_release(aio_context);
2251 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2253 return bdrv_named_nodes_list();
2256 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
2258 void qmp_drive_mirror(const char *device, const char *target,
2259 bool has_format, const char *format,
2260 bool has_node_name, const char *node_name,
2261 bool has_replaces, const char *replaces,
2262 enum MirrorSyncMode sync,
2263 bool has_mode, enum NewImageMode mode,
2264 bool has_speed, int64_t speed,
2265 bool has_granularity, uint32_t granularity,
2266 bool has_buf_size, int64_t buf_size,
2267 bool has_on_source_error, BlockdevOnError on_source_error,
2268 bool has_on_target_error, BlockdevOnError on_target_error,
2271 BlockDriverState *bs;
2272 BlockDriverState *source, *target_bs;
2273 AioContext *aio_context;
2274 BlockDriver *drv = NULL;
2275 Error *local_err = NULL;
2276 QDict *options = NULL;
2284 if (!has_on_source_error) {
2285 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2287 if (!has_on_target_error) {
2288 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2291 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2293 if (!has_granularity) {
2296 if (!has_buf_size) {
2297 buf_size = DEFAULT_MIRROR_BUF_SIZE;
2300 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2301 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2302 "a value in range [512B, 64MB]");
2305 if (granularity & (granularity - 1)) {
2306 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2");
2310 bs = bdrv_find(device);
2312 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2316 aio_context = bdrv_get_aio_context(bs);
2317 aio_context_acquire(aio_context);
2319 if (!bdrv_is_inserted(bs)) {
2320 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2325 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2328 drv = bdrv_find_format(format);
2330 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2335 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2339 flags = bs->open_flags | BDRV_O_RDWR;
2340 source = bs->backing_hd;
2341 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2342 sync = MIRROR_SYNC_MODE_FULL;
2344 if (sync == MIRROR_SYNC_MODE_NONE) {
2348 size = bdrv_getlength(bs);
2350 error_setg_errno(errp, -size, "bdrv_getlength failed");
2355 BlockDriverState *to_replace_bs;
2356 AioContext *replace_aio_context;
2357 int64_t replace_size;
2359 if (!has_node_name) {
2360 error_setg(errp, "a node-name must be provided when replacing a"
2361 " named node of the graph");
2365 to_replace_bs = check_to_replace_node(replaces, &local_err);
2367 if (!to_replace_bs) {
2368 error_propagate(errp, local_err);
2372 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
2373 aio_context_acquire(replace_aio_context);
2374 replace_size = bdrv_getlength(to_replace_bs);
2375 aio_context_release(replace_aio_context);
2377 if (size != replace_size) {
2378 error_setg(errp, "cannot replace image with a mirror image of "
2384 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2385 && mode != NEW_IMAGE_MODE_EXISTING)
2387 /* create new image w/o backing file */
2388 assert(format && drv);
2389 bdrv_img_create(target, format,
2390 NULL, NULL, NULL, size, flags, &local_err, false);
2393 case NEW_IMAGE_MODE_EXISTING:
2395 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2396 /* create new image with backing file */
2397 bdrv_img_create(target, format,
2399 source->drv->format_name,
2400 NULL, size, flags, &local_err, false);
2408 error_propagate(errp, local_err);
2412 if (has_node_name) {
2413 options = qdict_new();
2414 qdict_put(options, "node-name", qstring_from_str(node_name));
2417 /* Mirroring takes care of copy-on-write using the source's backing
2421 ret = bdrv_open(&target_bs, target, NULL, options,
2422 flags | BDRV_O_NO_BACKING, drv, &local_err);
2424 error_propagate(errp, local_err);
2428 bdrv_set_aio_context(target_bs, aio_context);
2430 /* pass the node name to replace to mirror start since it's loose coupling
2431 * and will allow to check whether the node still exist at mirror completion
2433 mirror_start(bs, target_bs,
2434 has_replaces ? replaces : NULL,
2435 speed, granularity, buf_size, sync,
2436 on_source_error, on_target_error,
2437 block_job_cb, bs, &local_err);
2438 if (local_err != NULL) {
2439 bdrv_unref(target_bs);
2440 error_propagate(errp, local_err);
2445 aio_context_release(aio_context);
2448 /* Get the block job for a given device name and acquire its AioContext */
2449 static BlockJob *find_block_job(const char *device, AioContext **aio_context)
2451 BlockDriverState *bs;
2453 bs = bdrv_find(device);
2458 *aio_context = bdrv_get_aio_context(bs);
2459 aio_context_acquire(*aio_context);
2462 aio_context_release(*aio_context);
2469 *aio_context = NULL;
2473 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2475 AioContext *aio_context;
2476 BlockJob *job = find_block_job(device, &aio_context);
2479 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2483 block_job_set_speed(job, speed, errp);
2484 aio_context_release(aio_context);
2487 void qmp_block_job_cancel(const char *device,
2488 bool has_force, bool force, Error **errp)
2490 AioContext *aio_context;
2491 BlockJob *job = find_block_job(device, &aio_context);
2494 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2502 if (job->paused && !force) {
2503 error_setg(errp, "The block job for device '%s' is currently paused",
2508 trace_qmp_block_job_cancel(job);
2509 block_job_cancel(job);
2511 aio_context_release(aio_context);
2514 void qmp_block_job_pause(const char *device, Error **errp)
2516 AioContext *aio_context;
2517 BlockJob *job = find_block_job(device, &aio_context);
2520 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2524 trace_qmp_block_job_pause(job);
2525 block_job_pause(job);
2526 aio_context_release(aio_context);
2529 void qmp_block_job_resume(const char *device, Error **errp)
2531 AioContext *aio_context;
2532 BlockJob *job = find_block_job(device, &aio_context);
2535 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2539 trace_qmp_block_job_resume(job);
2540 block_job_resume(job);
2541 aio_context_release(aio_context);
2544 void qmp_block_job_complete(const char *device, Error **errp)
2546 AioContext *aio_context;
2547 BlockJob *job = find_block_job(device, &aio_context);
2550 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2554 trace_qmp_block_job_complete(job);
2555 block_job_complete(job, errp);
2556 aio_context_release(aio_context);
2559 void qmp_change_backing_file(const char *device,
2560 const char *image_node_name,
2561 const char *backing_file,
2564 BlockDriverState *bs = NULL;
2565 BlockDriverState *image_bs = NULL;
2566 Error *local_err = NULL;
2571 /* find the top layer BDS of the chain */
2572 bs = bdrv_find(device);
2574 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2578 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
2580 error_propagate(errp, local_err);
2585 error_setg(errp, "image file not found");
2589 if (bdrv_find_base(image_bs) == image_bs) {
2590 error_setg(errp, "not allowing backing file change on an image "
2591 "without a backing file");
2595 /* even though we are not necessarily operating on bs, we need it to
2596 * determine if block ops are currently prohibited on the chain */
2597 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
2601 /* final sanity check */
2602 if (!bdrv_chain_contains(bs, image_bs)) {
2603 error_setg(errp, "'%s' and image file are not in the same chain",
2608 /* if not r/w, reopen to make r/w */
2609 open_flags = image_bs->open_flags;
2610 ro = bdrv_is_read_only(image_bs);
2613 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
2615 error_propagate(errp, local_err);
2620 ret = bdrv_change_backing_file(image_bs, backing_file,
2621 image_bs->drv ? image_bs->drv->format_name : "");
2624 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
2626 /* don't exit here, so we can try to restore open flags if
2631 bdrv_reopen(image_bs, open_flags, &local_err);
2633 error_propagate(errp, local_err); /* will preserve prior errp */
2638 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2640 QmpOutputVisitor *ov = qmp_output_visitor_new();
2644 Error *local_err = NULL;
2646 /* Require an ID in the top level */
2647 if (!options->has_id) {
2648 error_setg(errp, "Block device needs an ID");
2652 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
2653 * cache.direct=false instead of silently switching to aio=threads, except
2654 * when called from drive_new().
2656 * For now, simply forbidding the combination for all drivers will do. */
2657 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2658 bool direct = options->has_cache &&
2659 options->cache->has_direct &&
2660 options->cache->direct;
2662 error_setg(errp, "aio=native requires cache.direct=true");
2667 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2668 &options, NULL, &local_err);
2670 error_propagate(errp, local_err);
2674 obj = qmp_output_get_qobject(ov);
2675 qdict = qobject_to_qdict(obj);
2677 qdict_flatten(qdict);
2679 blk = blockdev_init(NULL, qdict, &local_err);
2681 error_propagate(errp, local_err);
2685 if (bdrv_key_required(blk_bs(blk))) {
2687 error_setg(errp, "blockdev-add doesn't support encrypted devices");
2692 qmp_output_visitor_cleanup(ov);
2695 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2697 BlockJobInfoList *head = NULL, **p_next = &head;
2698 BlockDriverState *bs;
2700 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
2701 AioContext *aio_context = bdrv_get_aio_context(bs);
2703 aio_context_acquire(aio_context);
2706 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2707 elem->value = block_job_query(bs->job);
2709 p_next = &elem->next;
2712 aio_context_release(aio_context);
2718 QemuOptsList qemu_common_drive_opts = {
2720 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2724 .type = QEMU_OPT_BOOL,
2725 .help = "enable/disable snapshot mode",
2728 .type = QEMU_OPT_STRING,
2729 .help = "discard operation (ignore/off, unmap/on)",
2731 .name = "cache.writeback",
2732 .type = QEMU_OPT_BOOL,
2733 .help = "enables writeback mode for any caches",
2735 .name = "cache.direct",
2736 .type = QEMU_OPT_BOOL,
2737 .help = "enables use of O_DIRECT (bypass the host page cache)",
2739 .name = "cache.no-flush",
2740 .type = QEMU_OPT_BOOL,
2741 .help = "ignore any flush requests for the device",
2744 .type = QEMU_OPT_STRING,
2745 .help = "host AIO implementation (threads, native)",
2748 .type = QEMU_OPT_STRING,
2749 .help = "disk format (raw, qcow2, ...)",
2752 .type = QEMU_OPT_STRING,
2753 .help = "read error action",
2756 .type = QEMU_OPT_STRING,
2757 .help = "write error action",
2759 .name = "read-only",
2760 .type = QEMU_OPT_BOOL,
2761 .help = "open drive file as read-only",
2763 .name = "throttling.iops-total",
2764 .type = QEMU_OPT_NUMBER,
2765 .help = "limit total I/O operations per second",
2767 .name = "throttling.iops-read",
2768 .type = QEMU_OPT_NUMBER,
2769 .help = "limit read operations per second",
2771 .name = "throttling.iops-write",
2772 .type = QEMU_OPT_NUMBER,
2773 .help = "limit write operations per second",
2775 .name = "throttling.bps-total",
2776 .type = QEMU_OPT_NUMBER,
2777 .help = "limit total bytes per second",
2779 .name = "throttling.bps-read",
2780 .type = QEMU_OPT_NUMBER,
2781 .help = "limit read bytes per second",
2783 .name = "throttling.bps-write",
2784 .type = QEMU_OPT_NUMBER,
2785 .help = "limit write bytes per second",
2787 .name = "throttling.iops-total-max",
2788 .type = QEMU_OPT_NUMBER,
2789 .help = "I/O operations burst",
2791 .name = "throttling.iops-read-max",
2792 .type = QEMU_OPT_NUMBER,
2793 .help = "I/O operations read burst",
2795 .name = "throttling.iops-write-max",
2796 .type = QEMU_OPT_NUMBER,
2797 .help = "I/O operations write burst",
2799 .name = "throttling.bps-total-max",
2800 .type = QEMU_OPT_NUMBER,
2801 .help = "total bytes burst",
2803 .name = "throttling.bps-read-max",
2804 .type = QEMU_OPT_NUMBER,
2805 .help = "total bytes read burst",
2807 .name = "throttling.bps-write-max",
2808 .type = QEMU_OPT_NUMBER,
2809 .help = "total bytes write burst",
2811 .name = "throttling.iops-size",
2812 .type = QEMU_OPT_NUMBER,
2813 .help = "when limiting by iops max size of an I/O in bytes",
2815 .name = "copy-on-read",
2816 .type = QEMU_OPT_BOOL,
2817 .help = "copy read data from backing file into image file",
2819 .name = "detect-zeroes",
2820 .type = QEMU_OPT_STRING,
2821 .help = "try to optimize zero writes (off, on, unmap)",
2823 { /* end of list */ }
2827 QemuOptsList qemu_drive_opts = {
2829 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2832 * no elements => accept any params
2833 * validation will happen later
2835 { /* end of list */ }