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 QEMUSnapshotInfo sn;
1109 Error *local_err = NULL;
1110 SnapshotInfo *info = NULL;
1114 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1127 error_setg(errp, "Name or id must be provided");
1131 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1133 error_propagate(errp, local_err);
1138 "Snapshot with id '%s' and name '%s' does not exist on "
1140 STR_OR_NULL(id), STR_OR_NULL(name), device);
1144 bdrv_snapshot_delete(bs, id, name, &local_err);
1146 error_propagate(errp, local_err);
1150 info = g_new0(SnapshotInfo, 1);
1151 info->id = g_strdup(sn.id_str);
1152 info->name = g_strdup(sn.name);
1153 info->date_nsec = sn.date_nsec;
1154 info->date_sec = sn.date_sec;
1155 info->vm_state_size = sn.vm_state_size;
1156 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1157 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1162 /* New and old BlockDriverState structs for group snapshots */
1164 typedef struct BlkTransactionState BlkTransactionState;
1166 /* Only prepare() may fail. In a single transaction, only one of commit() or
1167 abort() will be called, clean() will always be called if it present. */
1168 typedef struct BdrvActionOps {
1169 /* Size of state struct, in bytes. */
1170 size_t instance_size;
1171 /* Prepare the work, must NOT be NULL. */
1172 void (*prepare)(BlkTransactionState *common, Error **errp);
1173 /* Commit the changes, can be NULL. */
1174 void (*commit)(BlkTransactionState *common);
1175 /* Abort the changes on fail, can be NULL. */
1176 void (*abort)(BlkTransactionState *common);
1177 /* Clean up resource in the end, can be NULL. */
1178 void (*clean)(BlkTransactionState *common);
1182 * This structure must be arranged as first member in child type, assuming
1183 * that compiler will also arrange it to the same address with parent instance.
1184 * Later it will be used in free().
1186 struct BlkTransactionState {
1187 TransactionAction *action;
1188 const BdrvActionOps *ops;
1189 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1192 /* internal snapshot private data */
1193 typedef struct InternalSnapshotState {
1194 BlkTransactionState common;
1195 BlockDriverState *bs;
1196 QEMUSnapshotInfo sn;
1197 } InternalSnapshotState;
1199 static void internal_snapshot_prepare(BlkTransactionState *common,
1202 Error *local_err = NULL;
1205 BlockDriverState *bs;
1206 QEMUSnapshotInfo old_sn, *sn;
1209 BlockdevSnapshotInternal *internal;
1210 InternalSnapshotState *state;
1213 g_assert(common->action->kind ==
1214 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1215 internal = common->action->blockdev_snapshot_internal_sync;
1216 state = DO_UPCAST(InternalSnapshotState, common, common);
1218 /* 1. parse input */
1219 device = internal->device;
1220 name = internal->name;
1222 /* 2. check for validation */
1223 bs = bdrv_find(device);
1225 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1229 if (!bdrv_is_inserted(bs)) {
1230 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1234 if (bdrv_is_read_only(bs)) {
1235 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1239 if (!bdrv_can_snapshot(bs)) {
1240 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1241 bs->drv->format_name, device, "internal snapshot");
1245 if (!strlen(name)) {
1246 error_setg(errp, "Name is empty");
1250 /* check whether a snapshot with name exist */
1251 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1254 error_propagate(errp, local_err);
1258 "Snapshot with name '%s' already exists on device '%s'",
1263 /* 3. take the snapshot */
1265 pstrcpy(sn->name, sizeof(sn->name), name);
1266 qemu_gettimeofday(&tv);
1267 sn->date_sec = tv.tv_sec;
1268 sn->date_nsec = tv.tv_usec * 1000;
1269 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1271 ret1 = bdrv_snapshot_create(bs, sn);
1273 error_setg_errno(errp, -ret1,
1274 "Failed to create snapshot '%s' on device '%s'",
1279 /* 4. succeed, mark a snapshot is created */
1283 static void internal_snapshot_abort(BlkTransactionState *common)
1285 InternalSnapshotState *state =
1286 DO_UPCAST(InternalSnapshotState, common, common);
1287 BlockDriverState *bs = state->bs;
1288 QEMUSnapshotInfo *sn = &state->sn;
1289 Error *local_error = NULL;
1295 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1296 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1297 "device '%s' in abort: %s",
1300 bdrv_get_device_name(bs),
1301 error_get_pretty(local_error));
1302 error_free(local_error);
1306 /* external snapshot private data */
1307 typedef struct ExternalSnapshotState {
1308 BlkTransactionState common;
1309 BlockDriverState *old_bs;
1310 BlockDriverState *new_bs;
1311 } ExternalSnapshotState;
1313 static void external_snapshot_prepare(BlkTransactionState *common,
1318 QDict *options = NULL;
1319 Error *local_err = NULL;
1320 bool has_device = false;
1322 bool has_node_name = false;
1323 const char *node_name;
1324 bool has_snapshot_node_name = false;
1325 const char *snapshot_node_name;
1326 const char *new_image_file;
1327 const char *format = "qcow2";
1328 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1329 ExternalSnapshotState *state =
1330 DO_UPCAST(ExternalSnapshotState, common, common);
1331 TransactionAction *action = common->action;
1333 /* get parameters */
1334 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1336 has_device = action->blockdev_snapshot_sync->has_device;
1337 device = action->blockdev_snapshot_sync->device;
1338 has_node_name = action->blockdev_snapshot_sync->has_node_name;
1339 node_name = action->blockdev_snapshot_sync->node_name;
1340 has_snapshot_node_name =
1341 action->blockdev_snapshot_sync->has_snapshot_node_name;
1342 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1344 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1345 if (action->blockdev_snapshot_sync->has_format) {
1346 format = action->blockdev_snapshot_sync->format;
1348 if (action->blockdev_snapshot_sync->has_mode) {
1349 mode = action->blockdev_snapshot_sync->mode;
1352 /* start processing */
1353 drv = bdrv_find_format(format);
1355 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1359 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1360 has_node_name ? node_name : NULL,
1363 error_propagate(errp, local_err);
1367 if (has_node_name && !has_snapshot_node_name) {
1368 error_setg(errp, "New snapshot node name missing");
1372 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1373 error_setg(errp, "New snapshot node name already existing");
1377 if (!bdrv_is_inserted(state->old_bs)) {
1378 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1382 if (bdrv_op_is_blocked(state->old_bs,
1383 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1387 if (!bdrv_is_read_only(state->old_bs)) {
1388 if (bdrv_flush(state->old_bs)) {
1389 error_set(errp, QERR_IO_ERROR);
1394 if (!bdrv_is_first_non_filter(state->old_bs)) {
1395 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1399 flags = state->old_bs->open_flags;
1401 /* create new image w/backing file */
1402 if (mode != NEW_IMAGE_MODE_EXISTING) {
1403 bdrv_img_create(new_image_file, format,
1404 state->old_bs->filename,
1405 state->old_bs->drv->format_name,
1406 NULL, -1, flags, &local_err, false);
1408 error_propagate(errp, local_err);
1413 if (has_snapshot_node_name) {
1414 options = qdict_new();
1415 qdict_put(options, "node-name",
1416 qstring_from_str(snapshot_node_name));
1419 /* TODO Inherit bs->options or only take explicit options with an
1420 * extended QMP command? */
1421 assert(state->new_bs == NULL);
1422 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1423 flags | BDRV_O_NO_BACKING, drv, &local_err);
1424 /* We will manually add the backing_hd field to the bs later */
1426 error_propagate(errp, local_err);
1430 static void external_snapshot_commit(BlkTransactionState *common)
1432 ExternalSnapshotState *state =
1433 DO_UPCAST(ExternalSnapshotState, common, common);
1435 /* This removes our old bs and adds the new bs */
1436 bdrv_append(state->new_bs, state->old_bs);
1437 /* We don't need (or want) to use the transactional
1438 * bdrv_reopen_multiple() across all the entries at once, because we
1439 * don't want to abort all of them if one of them fails the reopen */
1440 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1444 static void external_snapshot_abort(BlkTransactionState *common)
1446 ExternalSnapshotState *state =
1447 DO_UPCAST(ExternalSnapshotState, common, common);
1448 if (state->new_bs) {
1449 bdrv_unref(state->new_bs);
1453 typedef struct DriveBackupState {
1454 BlkTransactionState common;
1455 BlockDriverState *bs;
1459 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1461 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1462 DriveBackup *backup;
1463 Error *local_err = NULL;
1465 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1466 backup = common->action->drive_backup;
1468 qmp_drive_backup(backup->device, backup->target,
1469 backup->has_format, backup->format,
1471 backup->has_mode, backup->mode,
1472 backup->has_speed, backup->speed,
1473 backup->has_on_source_error, backup->on_source_error,
1474 backup->has_on_target_error, backup->on_target_error,
1477 error_propagate(errp, local_err);
1483 state->bs = bdrv_find(backup->device);
1484 state->job = state->bs->job;
1487 static void drive_backup_abort(BlkTransactionState *common)
1489 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1490 BlockDriverState *bs = state->bs;
1492 /* Only cancel if it's the job we started */
1493 if (bs && bs->job && bs->job == state->job) {
1494 block_job_cancel_sync(bs->job);
1498 static void abort_prepare(BlkTransactionState *common, Error **errp)
1500 error_setg(errp, "Transaction aborted using Abort action");
1503 static void abort_commit(BlkTransactionState *common)
1505 g_assert_not_reached(); /* this action never succeeds */
1508 static const BdrvActionOps actions[] = {
1509 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1510 .instance_size = sizeof(ExternalSnapshotState),
1511 .prepare = external_snapshot_prepare,
1512 .commit = external_snapshot_commit,
1513 .abort = external_snapshot_abort,
1515 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1516 .instance_size = sizeof(DriveBackupState),
1517 .prepare = drive_backup_prepare,
1518 .abort = drive_backup_abort,
1520 [TRANSACTION_ACTION_KIND_ABORT] = {
1521 .instance_size = sizeof(BlkTransactionState),
1522 .prepare = abort_prepare,
1523 .commit = abort_commit,
1525 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1526 .instance_size = sizeof(InternalSnapshotState),
1527 .prepare = internal_snapshot_prepare,
1528 .abort = internal_snapshot_abort,
1533 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
1534 * then we do not pivot any of the devices in the group, and abandon the
1537 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1539 TransactionActionList *dev_entry = dev_list;
1540 BlkTransactionState *state, *next;
1541 Error *local_err = NULL;
1543 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1544 QSIMPLEQ_INIT(&snap_bdrv_states);
1546 /* drain all i/o before any snapshots */
1549 /* We don't do anything in this loop that commits us to the snapshot */
1550 while (NULL != dev_entry) {
1551 TransactionAction *dev_info = NULL;
1552 const BdrvActionOps *ops;
1554 dev_info = dev_entry->value;
1555 dev_entry = dev_entry->next;
1557 assert(dev_info->kind < ARRAY_SIZE(actions));
1559 ops = &actions[dev_info->kind];
1560 assert(ops->instance_size > 0);
1562 state = g_malloc0(ops->instance_size);
1564 state->action = dev_info;
1565 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1567 state->ops->prepare(state, &local_err);
1569 error_propagate(errp, local_err);
1570 goto delete_and_fail;
1574 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1575 if (state->ops->commit) {
1576 state->ops->commit(state);
1585 * failure, and it is all-or-none; abandon each new bs, and keep using
1586 * the original bs for all images
1588 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1589 if (state->ops->abort) {
1590 state->ops->abort(state);
1594 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1595 if (state->ops->clean) {
1596 state->ops->clean(state);
1603 static void eject_device(BlockBackend *blk, int force, Error **errp)
1605 BlockDriverState *bs = blk_bs(blk);
1607 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1610 if (!blk_dev_has_removable_media(blk)) {
1611 error_setg(errp, "Device '%s' is not removable",
1612 bdrv_get_device_name(bs));
1616 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
1617 blk_dev_eject_request(blk, force);
1619 error_setg(errp, "Device '%s' is locked",
1620 bdrv_get_device_name(bs));
1628 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1632 blk = blk_by_name(device);
1634 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1638 eject_device(blk, force, errp);
1641 void qmp_block_passwd(bool has_device, const char *device,
1642 bool has_node_name, const char *node_name,
1643 const char *password, Error **errp)
1645 Error *local_err = NULL;
1646 BlockDriverState *bs;
1649 bs = bdrv_lookup_bs(has_device ? device : NULL,
1650 has_node_name ? node_name : NULL,
1653 error_propagate(errp, local_err);
1657 err = bdrv_set_key(bs, password);
1658 if (err == -EINVAL) {
1659 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1661 } else if (err < 0) {
1662 error_set(errp, QERR_INVALID_PASSWORD);
1667 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1668 int bdrv_flags, BlockDriver *drv,
1669 const char *password, Error **errp)
1671 Error *local_err = NULL;
1674 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err);
1676 error_propagate(errp, local_err);
1680 if (bdrv_key_required(bs)) {
1682 if (bdrv_set_key(bs, password) < 0) {
1683 error_set(errp, QERR_INVALID_PASSWORD);
1686 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1687 bdrv_get_encrypted_filename(bs));
1689 } else if (password) {
1690 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1694 void qmp_change_blockdev(const char *device, const char *filename,
1695 const char *format, Error **errp)
1698 BlockDriverState *bs;
1699 BlockDriver *drv = NULL;
1703 blk = blk_by_name(device);
1705 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1711 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1713 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1718 eject_device(blk, 0, &err);
1720 error_propagate(errp, err);
1724 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1725 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1727 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1730 /* throttling disk I/O limits */
1731 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1738 bool has_bps_rd_max,
1740 bool has_bps_wr_max,
1744 bool has_iops_rd_max,
1745 int64_t iops_rd_max,
1746 bool has_iops_wr_max,
1747 int64_t iops_wr_max,
1749 int64_t iops_size, Error **errp)
1752 BlockDriverState *bs;
1753 AioContext *aio_context;
1755 bs = bdrv_find(device);
1757 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1761 memset(&cfg, 0, sizeof(cfg));
1762 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1763 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1764 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1766 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1767 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1768 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1771 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1773 if (has_bps_rd_max) {
1774 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1776 if (has_bps_wr_max) {
1777 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1780 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1782 if (has_iops_rd_max) {
1783 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1785 if (has_iops_wr_max) {
1786 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1789 if (has_iops_size) {
1790 cfg.op_size = iops_size;
1793 if (!check_throttle_config(&cfg, errp)) {
1797 aio_context = bdrv_get_aio_context(bs);
1798 aio_context_acquire(aio_context);
1800 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1801 bdrv_io_limits_enable(bs);
1802 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1803 bdrv_io_limits_disable(bs);
1806 if (bs->io_limits_enabled) {
1807 bdrv_set_io_limits(bs, &cfg);
1810 aio_context_release(aio_context);
1813 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1815 const char *id = qdict_get_str(qdict, "id");
1817 BlockDriverState *bs;
1818 AioContext *aio_context;
1819 Error *local_err = NULL;
1821 blk = blk_by_name(id);
1823 error_report("Device '%s' not found", id);
1828 if (!blk_legacy_dinfo(blk)) {
1829 error_report("Deleting device added with blockdev-add"
1830 " is not supported");
1834 aio_context = bdrv_get_aio_context(bs);
1835 aio_context_acquire(aio_context);
1837 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
1838 error_report("%s", error_get_pretty(local_err));
1839 error_free(local_err);
1840 aio_context_release(aio_context);
1844 /* quiesce block driver; prevent further io */
1849 /* if we have a device attached to this BlockDriverState
1850 * then we need to make the drive anonymous until the device
1851 * can be removed. If this is a drive with no device backing
1852 * then we can just get rid of the block driver state right here.
1854 if (blk_get_attached_dev(blk)) {
1855 blk_hide_on_behalf_of_do_drive_del(blk);
1856 /* Further I/O must not pause the guest */
1857 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1858 BLOCKDEV_ON_ERROR_REPORT);
1863 aio_context_release(aio_context);
1867 void qmp_block_resize(bool has_device, const char *device,
1868 bool has_node_name, const char *node_name,
1869 int64_t size, Error **errp)
1871 Error *local_err = NULL;
1872 BlockDriverState *bs;
1873 AioContext *aio_context;
1876 bs = bdrv_lookup_bs(has_device ? device : NULL,
1877 has_node_name ? node_name : NULL,
1880 error_propagate(errp, local_err);
1884 aio_context = bdrv_get_aio_context(bs);
1885 aio_context_acquire(aio_context);
1887 if (!bdrv_is_first_non_filter(bs)) {
1888 error_set(errp, QERR_FEATURE_DISABLED, "resize");
1893 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1897 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
1898 error_set(errp, QERR_DEVICE_IN_USE, device);
1902 /* complete all in-flight operations before resizing the device */
1905 ret = bdrv_truncate(bs, size);
1910 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1913 error_set(errp, QERR_UNSUPPORTED);
1916 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1919 error_set(errp, QERR_DEVICE_IN_USE, device);
1922 error_setg_errno(errp, -ret, "Could not resize");
1927 aio_context_release(aio_context);
1930 static void block_job_cb(void *opaque, int ret)
1932 /* Note that this function may be executed from another AioContext besides
1933 * the QEMU main loop. If you need to access anything that assumes the
1934 * QEMU global mutex, use a BH or introduce a mutex.
1937 BlockDriverState *bs = opaque;
1938 const char *msg = NULL;
1940 trace_block_job_cb(bs, bs->job, ret);
1945 msg = strerror(-ret);
1948 if (block_job_is_cancelled(bs->job)) {
1949 block_job_event_cancelled(bs->job);
1951 block_job_event_completed(bs->job, msg);
1954 bdrv_put_ref_bh_schedule(bs);
1957 void qmp_block_stream(const char *device,
1958 bool has_base, const char *base,
1959 bool has_backing_file, const char *backing_file,
1960 bool has_speed, int64_t speed,
1961 bool has_on_error, BlockdevOnError on_error,
1964 BlockDriverState *bs;
1965 BlockDriverState *base_bs = NULL;
1966 AioContext *aio_context;
1967 Error *local_err = NULL;
1968 const char *base_name = NULL;
1970 if (!has_on_error) {
1971 on_error = BLOCKDEV_ON_ERROR_REPORT;
1974 bs = bdrv_find(device);
1976 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1980 aio_context = bdrv_get_aio_context(bs);
1981 aio_context_acquire(aio_context);
1983 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
1988 base_bs = bdrv_find_backing_image(bs, base);
1989 if (base_bs == NULL) {
1990 error_set(errp, QERR_BASE_NOT_FOUND, base);
1993 assert(bdrv_get_aio_context(base_bs) == aio_context);
1997 /* if we are streaming the entire chain, the result will have no backing
1998 * file, and specifying one is therefore an error */
1999 if (base_bs == NULL && has_backing_file) {
2000 error_setg(errp, "backing file specified, but streaming the "
2005 /* backing_file string overrides base bs filename */
2006 base_name = has_backing_file ? backing_file : base_name;
2008 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2009 on_error, block_job_cb, bs, &local_err);
2011 error_propagate(errp, local_err);
2015 trace_qmp_block_stream(bs, bs->job);
2018 aio_context_release(aio_context);
2021 void qmp_block_commit(const char *device,
2022 bool has_base, const char *base,
2023 bool has_top, const char *top,
2024 bool has_backing_file, const char *backing_file,
2025 bool has_speed, int64_t speed,
2028 BlockDriverState *bs;
2029 BlockDriverState *base_bs, *top_bs;
2030 Error *local_err = NULL;
2031 /* This will be part of the QMP command, if/when the
2032 * BlockdevOnError change for blkmirror makes it in
2034 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2040 /* drain all i/o before commits */
2044 * libvirt relies on the DeviceNotFound error class in order to probe for
2045 * live commit feature versions; for this to work, we must make sure to
2046 * perform the device lookup before any generic errors that may occur in a
2047 * scenario in which all optional arguments are omitted. */
2048 bs = bdrv_find(device);
2050 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2054 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, errp)) {
2058 /* default top_bs is the active layer */
2061 if (has_top && top) {
2062 if (strcmp(bs->filename, top) != 0) {
2063 top_bs = bdrv_find_backing_image(bs, top);
2067 if (top_bs == NULL) {
2068 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2072 if (has_base && base) {
2073 base_bs = bdrv_find_backing_image(top_bs, base);
2075 base_bs = bdrv_find_base(top_bs);
2078 if (base_bs == NULL) {
2079 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2083 /* Do not allow attempts to commit an image into itself */
2084 if (top_bs == base_bs) {
2085 error_setg(errp, "cannot commit an image into itself");
2090 if (has_backing_file) {
2091 error_setg(errp, "'backing-file' specified,"
2092 " but 'top' is the active layer");
2095 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2098 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2099 has_backing_file ? backing_file : NULL, &local_err);
2101 if (local_err != NULL) {
2102 error_propagate(errp, local_err);
2107 void qmp_drive_backup(const char *device, const char *target,
2108 bool has_format, const char *format,
2109 enum MirrorSyncMode sync,
2110 bool has_mode, enum NewImageMode mode,
2111 bool has_speed, int64_t speed,
2112 bool has_on_source_error, BlockdevOnError on_source_error,
2113 bool has_on_target_error, BlockdevOnError on_target_error,
2116 BlockDriverState *bs;
2117 BlockDriverState *target_bs;
2118 BlockDriverState *source = NULL;
2119 AioContext *aio_context;
2120 BlockDriver *drv = NULL;
2121 Error *local_err = NULL;
2129 if (!has_on_source_error) {
2130 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2132 if (!has_on_target_error) {
2133 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2136 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2139 bs = bdrv_find(device);
2141 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2145 aio_context = bdrv_get_aio_context(bs);
2146 aio_context_acquire(aio_context);
2148 if (!bdrv_is_inserted(bs)) {
2149 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2154 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2157 drv = bdrv_find_format(format);
2159 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2164 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2168 flags = bs->open_flags | BDRV_O_RDWR;
2170 /* See if we have a backing HD we can use to create our new image
2172 if (sync == MIRROR_SYNC_MODE_TOP) {
2173 source = bs->backing_hd;
2175 sync = MIRROR_SYNC_MODE_FULL;
2178 if (sync == MIRROR_SYNC_MODE_NONE) {
2182 size = bdrv_getlength(bs);
2184 error_setg_errno(errp, -size, "bdrv_getlength failed");
2188 if (mode != NEW_IMAGE_MODE_EXISTING) {
2189 assert(format && drv);
2191 bdrv_img_create(target, format, source->filename,
2192 source->drv->format_name, NULL,
2193 size, flags, &local_err, false);
2195 bdrv_img_create(target, format, NULL, NULL, NULL,
2196 size, flags, &local_err, false);
2201 error_propagate(errp, local_err);
2206 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
2208 error_propagate(errp, local_err);
2212 bdrv_set_aio_context(target_bs, aio_context);
2214 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
2215 block_job_cb, bs, &local_err);
2216 if (local_err != NULL) {
2217 bdrv_unref(target_bs);
2218 error_propagate(errp, local_err);
2223 aio_context_release(aio_context);
2226 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2228 return bdrv_named_nodes_list();
2231 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
2233 void qmp_drive_mirror(const char *device, const char *target,
2234 bool has_format, const char *format,
2235 bool has_node_name, const char *node_name,
2236 bool has_replaces, const char *replaces,
2237 enum MirrorSyncMode sync,
2238 bool has_mode, enum NewImageMode mode,
2239 bool has_speed, int64_t speed,
2240 bool has_granularity, uint32_t granularity,
2241 bool has_buf_size, int64_t buf_size,
2242 bool has_on_source_error, BlockdevOnError on_source_error,
2243 bool has_on_target_error, BlockdevOnError on_target_error,
2246 BlockDriverState *bs;
2247 BlockDriverState *source, *target_bs;
2248 BlockDriver *drv = NULL;
2249 Error *local_err = NULL;
2250 QDict *options = NULL;
2258 if (!has_on_source_error) {
2259 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2261 if (!has_on_target_error) {
2262 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2265 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2267 if (!has_granularity) {
2270 if (!has_buf_size) {
2271 buf_size = DEFAULT_MIRROR_BUF_SIZE;
2274 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2275 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2276 "a value in range [512B, 64MB]");
2279 if (granularity & (granularity - 1)) {
2280 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2");
2284 bs = bdrv_find(device);
2286 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2290 if (!bdrv_is_inserted(bs)) {
2291 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2296 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2299 drv = bdrv_find_format(format);
2301 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2306 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2310 flags = bs->open_flags | BDRV_O_RDWR;
2311 source = bs->backing_hd;
2312 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2313 sync = MIRROR_SYNC_MODE_FULL;
2315 if (sync == MIRROR_SYNC_MODE_NONE) {
2319 size = bdrv_getlength(bs);
2321 error_setg_errno(errp, -size, "bdrv_getlength failed");
2326 BlockDriverState *to_replace_bs;
2328 if (!has_node_name) {
2329 error_setg(errp, "a node-name must be provided when replacing a"
2330 " named node of the graph");
2334 to_replace_bs = check_to_replace_node(replaces, &local_err);
2336 if (!to_replace_bs) {
2337 error_propagate(errp, local_err);
2341 if (size != bdrv_getlength(to_replace_bs)) {
2342 error_setg(errp, "cannot replace image with a mirror image of "
2348 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2349 && mode != NEW_IMAGE_MODE_EXISTING)
2351 /* create new image w/o backing file */
2352 assert(format && drv);
2353 bdrv_img_create(target, format,
2354 NULL, NULL, NULL, size, flags, &local_err, false);
2357 case NEW_IMAGE_MODE_EXISTING:
2359 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2360 /* create new image with backing file */
2361 bdrv_img_create(target, format,
2363 source->drv->format_name,
2364 NULL, size, flags, &local_err, false);
2372 error_propagate(errp, local_err);
2376 if (has_node_name) {
2377 options = qdict_new();
2378 qdict_put(options, "node-name", qstring_from_str(node_name));
2381 /* Mirroring takes care of copy-on-write using the source's backing
2385 ret = bdrv_open(&target_bs, target, NULL, options,
2386 flags | BDRV_O_NO_BACKING, drv, &local_err);
2388 error_propagate(errp, local_err);
2392 /* pass the node name to replace to mirror start since it's loose coupling
2393 * and will allow to check whether the node still exist at mirror completion
2395 mirror_start(bs, target_bs,
2396 has_replaces ? replaces : NULL,
2397 speed, granularity, buf_size, sync,
2398 on_source_error, on_target_error,
2399 block_job_cb, bs, &local_err);
2400 if (local_err != NULL) {
2401 bdrv_unref(target_bs);
2402 error_propagate(errp, local_err);
2407 /* Get the block job for a given device name and acquire its AioContext */
2408 static BlockJob *find_block_job(const char *device, AioContext **aio_context)
2410 BlockDriverState *bs;
2412 bs = bdrv_find(device);
2417 *aio_context = bdrv_get_aio_context(bs);
2418 aio_context_acquire(*aio_context);
2421 aio_context_release(*aio_context);
2428 *aio_context = NULL;
2432 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2434 AioContext *aio_context;
2435 BlockJob *job = find_block_job(device, &aio_context);
2438 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2442 block_job_set_speed(job, speed, errp);
2443 aio_context_release(aio_context);
2446 void qmp_block_job_cancel(const char *device,
2447 bool has_force, bool force, Error **errp)
2449 AioContext *aio_context;
2450 BlockJob *job = find_block_job(device, &aio_context);
2453 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2461 if (job->paused && !force) {
2462 error_setg(errp, "The block job for device '%s' is currently paused",
2467 trace_qmp_block_job_cancel(job);
2468 block_job_cancel(job);
2470 aio_context_release(aio_context);
2473 void qmp_block_job_pause(const char *device, 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 trace_qmp_block_job_pause(job);
2484 block_job_pause(job);
2485 aio_context_release(aio_context);
2488 void qmp_block_job_resume(const char *device, 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);
2498 trace_qmp_block_job_resume(job);
2499 block_job_resume(job);
2500 aio_context_release(aio_context);
2503 void qmp_block_job_complete(const char *device, Error **errp)
2505 AioContext *aio_context;
2506 BlockJob *job = find_block_job(device, &aio_context);
2509 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2513 trace_qmp_block_job_complete(job);
2514 block_job_complete(job, errp);
2515 aio_context_release(aio_context);
2518 void qmp_change_backing_file(const char *device,
2519 const char *image_node_name,
2520 const char *backing_file,
2523 BlockDriverState *bs = NULL;
2524 BlockDriverState *image_bs = NULL;
2525 Error *local_err = NULL;
2530 /* find the top layer BDS of the chain */
2531 bs = bdrv_find(device);
2533 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2537 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
2539 error_propagate(errp, local_err);
2544 error_setg(errp, "image file not found");
2548 if (bdrv_find_base(image_bs) == image_bs) {
2549 error_setg(errp, "not allowing backing file change on an image "
2550 "without a backing file");
2554 /* even though we are not necessarily operating on bs, we need it to
2555 * determine if block ops are currently prohibited on the chain */
2556 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
2560 /* final sanity check */
2561 if (!bdrv_chain_contains(bs, image_bs)) {
2562 error_setg(errp, "'%s' and image file are not in the same chain",
2567 /* if not r/w, reopen to make r/w */
2568 open_flags = image_bs->open_flags;
2569 ro = bdrv_is_read_only(image_bs);
2572 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
2574 error_propagate(errp, local_err);
2579 ret = bdrv_change_backing_file(image_bs, backing_file,
2580 image_bs->drv ? image_bs->drv->format_name : "");
2583 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
2585 /* don't exit here, so we can try to restore open flags if
2590 bdrv_reopen(image_bs, open_flags, &local_err);
2592 error_propagate(errp, local_err); /* will preserve prior errp */
2597 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2599 QmpOutputVisitor *ov = qmp_output_visitor_new();
2603 Error *local_err = NULL;
2605 /* Require an ID in the top level */
2606 if (!options->has_id) {
2607 error_setg(errp, "Block device needs an ID");
2611 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
2612 * cache.direct=false instead of silently switching to aio=threads, except
2613 * when called from drive_new().
2615 * For now, simply forbidding the combination for all drivers will do. */
2616 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2617 bool direct = options->has_cache &&
2618 options->cache->has_direct &&
2619 options->cache->direct;
2621 error_setg(errp, "aio=native requires cache.direct=true");
2626 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2627 &options, NULL, &local_err);
2629 error_propagate(errp, local_err);
2633 obj = qmp_output_get_qobject(ov);
2634 qdict = qobject_to_qdict(obj);
2636 qdict_flatten(qdict);
2638 blk = blockdev_init(NULL, qdict, &local_err);
2640 error_propagate(errp, local_err);
2644 if (bdrv_key_required(blk_bs(blk))) {
2646 error_setg(errp, "blockdev-add doesn't support encrypted devices");
2651 qmp_output_visitor_cleanup(ov);
2654 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2656 BlockJobInfoList *head = NULL, **p_next = &head;
2657 BlockDriverState *bs;
2659 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
2660 AioContext *aio_context = bdrv_get_aio_context(bs);
2662 aio_context_acquire(aio_context);
2665 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2666 elem->value = block_job_query(bs->job);
2668 p_next = &elem->next;
2671 aio_context_release(aio_context);
2677 QemuOptsList qemu_common_drive_opts = {
2679 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2683 .type = QEMU_OPT_BOOL,
2684 .help = "enable/disable snapshot mode",
2687 .type = QEMU_OPT_STRING,
2688 .help = "discard operation (ignore/off, unmap/on)",
2690 .name = "cache.writeback",
2691 .type = QEMU_OPT_BOOL,
2692 .help = "enables writeback mode for any caches",
2694 .name = "cache.direct",
2695 .type = QEMU_OPT_BOOL,
2696 .help = "enables use of O_DIRECT (bypass the host page cache)",
2698 .name = "cache.no-flush",
2699 .type = QEMU_OPT_BOOL,
2700 .help = "ignore any flush requests for the device",
2703 .type = QEMU_OPT_STRING,
2704 .help = "host AIO implementation (threads, native)",
2707 .type = QEMU_OPT_STRING,
2708 .help = "disk format (raw, qcow2, ...)",
2711 .type = QEMU_OPT_STRING,
2712 .help = "read error action",
2715 .type = QEMU_OPT_STRING,
2716 .help = "write error action",
2718 .name = "read-only",
2719 .type = QEMU_OPT_BOOL,
2720 .help = "open drive file as read-only",
2722 .name = "throttling.iops-total",
2723 .type = QEMU_OPT_NUMBER,
2724 .help = "limit total I/O operations per second",
2726 .name = "throttling.iops-read",
2727 .type = QEMU_OPT_NUMBER,
2728 .help = "limit read operations per second",
2730 .name = "throttling.iops-write",
2731 .type = QEMU_OPT_NUMBER,
2732 .help = "limit write operations per second",
2734 .name = "throttling.bps-total",
2735 .type = QEMU_OPT_NUMBER,
2736 .help = "limit total bytes per second",
2738 .name = "throttling.bps-read",
2739 .type = QEMU_OPT_NUMBER,
2740 .help = "limit read bytes per second",
2742 .name = "throttling.bps-write",
2743 .type = QEMU_OPT_NUMBER,
2744 .help = "limit write bytes per second",
2746 .name = "throttling.iops-total-max",
2747 .type = QEMU_OPT_NUMBER,
2748 .help = "I/O operations burst",
2750 .name = "throttling.iops-read-max",
2751 .type = QEMU_OPT_NUMBER,
2752 .help = "I/O operations read burst",
2754 .name = "throttling.iops-write-max",
2755 .type = QEMU_OPT_NUMBER,
2756 .help = "I/O operations write burst",
2758 .name = "throttling.bps-total-max",
2759 .type = QEMU_OPT_NUMBER,
2760 .help = "total bytes burst",
2762 .name = "throttling.bps-read-max",
2763 .type = QEMU_OPT_NUMBER,
2764 .help = "total bytes read burst",
2766 .name = "throttling.bps-write-max",
2767 .type = QEMU_OPT_NUMBER,
2768 .help = "total bytes write burst",
2770 .name = "throttling.iops-size",
2771 .type = QEMU_OPT_NUMBER,
2772 .help = "when limiting by iops max size of an I/O in bytes",
2774 .name = "copy-on-read",
2775 .type = QEMU_OPT_BOOL,
2776 .help = "copy read data from backing file into image file",
2778 .name = "detect-zeroes",
2779 .type = QEMU_OPT_STRING,
2780 .help = "try to optimize zero writes (off, on, unmap)",
2782 { /* end of list */ }
2786 QemuOptsList qemu_drive_opts = {
2788 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2791 * no elements => accept any params
2792 * validation will happen later
2794 { /* end of list */ }