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/blockdev.h"
34 #include "hw/block/block.h"
35 #include "block/blockjob.h"
36 #include "monitor/monitor.h"
37 #include "qapi/qmp/qerror.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 "sysemu/sysemu.h"
44 #include "block/block_int.h"
45 #include "qmp-commands.h"
47 #include "sysemu/arch_init.h"
49 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
51 static const char *const if_name[IF_COUNT] = {
55 [IF_FLOPPY] = "floppy",
56 [IF_PFLASH] = "pflash",
59 [IF_VIRTIO] = "virtio",
63 static const int if_max_devs[IF_COUNT] = {
65 * Do not change these numbers! They govern how drive option
66 * index maps to unit and bus. That mapping is ABI.
68 * All controllers used to imlement if=T drives need to support
69 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
70 * Otherwise, some index values map to "impossible" bus, unit
73 * For instance, if you change [IF_SCSI] to 255, -drive
74 * if=scsi,index=12 no longer means bus=1,unit=5, but
75 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
76 * the drive can't be set up. Regression.
83 * We automatically delete the drive when a device using it gets
84 * unplugged. Questionable feature, but we can't just drop it.
85 * Device models call blockdev_mark_auto_del() to schedule the
86 * automatic deletion, and generic qdev code calls blockdev_auto_del()
87 * when deletion is actually safe.
89 void blockdev_mark_auto_del(BlockDriverState *bs)
91 DriveInfo *dinfo = drive_get_by_blockdev(bs);
93 if (dinfo && !dinfo->enable_auto_del) {
98 block_job_cancel(bs->job);
105 void blockdev_auto_del(BlockDriverState *bs)
107 DriveInfo *dinfo = drive_get_by_blockdev(bs);
109 if (dinfo && dinfo->auto_del) {
110 drive_put_ref(dinfo);
114 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
116 int max_devs = if_max_devs[type];
117 return max_devs ? index / max_devs : 0;
120 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
122 int max_devs = if_max_devs[type];
123 return max_devs ? index % max_devs : index;
126 QemuOpts *drive_def(const char *optstr)
128 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
131 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
137 opts = drive_def(optstr);
141 if (type != IF_DEFAULT) {
142 qemu_opt_set(opts, "if", if_name[type]);
145 snprintf(buf, sizeof(buf), "%d", index);
146 qemu_opt_set(opts, "index", buf);
149 qemu_opt_set(opts, "file", file);
153 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
157 /* seek interface, bus and unit */
159 QTAILQ_FOREACH(dinfo, &drives, next) {
160 if (dinfo->type == type &&
169 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
171 return drive_get(type,
172 drive_index_to_bus_id(type, index),
173 drive_index_to_unit_id(type, index));
176 int drive_get_max_bus(BlockInterfaceType type)
182 QTAILQ_FOREACH(dinfo, &drives, next) {
183 if(dinfo->type == type &&
184 dinfo->bus > max_bus)
185 max_bus = dinfo->bus;
190 /* Get a block device. This should only be used for single-drive devices
191 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
193 DriveInfo *drive_get_next(BlockInterfaceType type)
195 static int next_block_unit[IF_COUNT];
197 return drive_get(type, 0, next_block_unit[type]++);
200 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
204 QTAILQ_FOREACH(dinfo, &drives, next) {
205 if (dinfo->bdrv == bs) {
212 static void bdrv_format_print(void *opaque, const char *name)
214 error_printf(" %s", name);
217 static void drive_uninit(DriveInfo *dinfo)
220 qemu_opts_del(dinfo->opts);
223 bdrv_unref(dinfo->bdrv);
225 QTAILQ_REMOVE(&drives, dinfo, next);
226 g_free(dinfo->serial);
230 void drive_put_ref(DriveInfo *dinfo)
232 assert(dinfo->refcount);
233 if (--dinfo->refcount == 0) {
238 void drive_get_ref(DriveInfo *dinfo)
245 BlockDriverState *bs;
248 static void bdrv_put_ref_bh(void *opaque)
250 BDRVPutRefBH *s = opaque;
253 qemu_bh_delete(s->bh);
258 * Release a BDS reference in a BH
260 * It is not safe to use bdrv_unref() from a callback function when the callers
261 * still need the BlockDriverState. In such cases we schedule a BH to release
264 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
268 s = g_new(BDRVPutRefBH, 1);
269 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
271 qemu_bh_schedule(s->bh);
274 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
276 if (!strcmp(buf, "ignore")) {
277 return BLOCKDEV_ON_ERROR_IGNORE;
278 } else if (!is_read && !strcmp(buf, "enospc")) {
279 return BLOCKDEV_ON_ERROR_ENOSPC;
280 } else if (!strcmp(buf, "stop")) {
281 return BLOCKDEV_ON_ERROR_STOP;
282 } else if (!strcmp(buf, "report")) {
283 return BLOCKDEV_ON_ERROR_REPORT;
285 error_setg(errp, "'%s' invalid %s error action",
286 buf, is_read ? "read" : "write");
291 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
293 if (throttle_conflicting(cfg)) {
294 error_setg(errp, "bps/iops/max total values and read/write values"
295 " cannot be used at the same time");
299 if (!throttle_is_valid(cfg)) {
300 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
307 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
309 /* Takes the ownership of bs_opts */
310 static DriveInfo *blockdev_init(QDict *bs_opts,
311 BlockInterfaceType type,
315 const char *file = NULL;
319 int on_read_error, on_write_error;
328 bool has_driver_specific_opts;
329 BlockDriver *drv = NULL;
331 /* Check common options by copying from bs_opts to opts, all other options
332 * stay in bs_opts for processing by bdrv_open(). */
333 id = qdict_get_try_str(bs_opts, "id");
334 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
335 if (error_is_set(&error)) {
336 error_propagate(errp, error);
340 qemu_opts_absorb_qdict(opts, bs_opts, &error);
341 if (error_is_set(&error)) {
342 error_propagate(errp, error);
347 qdict_del(bs_opts, "id");
350 has_driver_specific_opts = !!qdict_size(bs_opts);
352 /* extract parameters */
353 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
354 ro = qemu_opt_get_bool(opts, "read-only", 0);
355 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
357 file = qemu_opt_get(opts, "file");
358 serial = qemu_opt_get(opts, "serial");
360 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
361 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
362 error_setg(errp, "invalid discard option");
367 if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
368 bdrv_flags |= BDRV_O_CACHE_WB;
370 if (qemu_opt_get_bool(opts, "cache.direct", false)) {
371 bdrv_flags |= BDRV_O_NOCACHE;
373 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
374 bdrv_flags |= BDRV_O_NO_FLUSH;
377 #ifdef CONFIG_LINUX_AIO
378 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
379 if (!strcmp(buf, "native")) {
380 bdrv_flags |= BDRV_O_NATIVE_AIO;
381 } else if (!strcmp(buf, "threads")) {
382 /* this is the default */
384 error_setg(errp, "invalid aio option");
390 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
391 if (is_help_option(buf)) {
392 error_printf("Supported formats:");
393 bdrv_iterate_format(bdrv_format_print, NULL);
398 drv = bdrv_find_format(buf);
400 error_setg(errp, "'%s' invalid format", buf);
405 /* disk I/O throttling */
406 memset(&cfg, 0, sizeof(cfg));
407 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
408 qemu_opt_get_number(opts, "throttling.bps-total", 0);
409 cfg.buckets[THROTTLE_BPS_READ].avg =
410 qemu_opt_get_number(opts, "throttling.bps-read", 0);
411 cfg.buckets[THROTTLE_BPS_WRITE].avg =
412 qemu_opt_get_number(opts, "throttling.bps-write", 0);
413 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
414 qemu_opt_get_number(opts, "throttling.iops-total", 0);
415 cfg.buckets[THROTTLE_OPS_READ].avg =
416 qemu_opt_get_number(opts, "throttling.iops-read", 0);
417 cfg.buckets[THROTTLE_OPS_WRITE].avg =
418 qemu_opt_get_number(opts, "throttling.iops-write", 0);
420 cfg.buckets[THROTTLE_BPS_TOTAL].max =
421 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
422 cfg.buckets[THROTTLE_BPS_READ].max =
423 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
424 cfg.buckets[THROTTLE_BPS_WRITE].max =
425 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
426 cfg.buckets[THROTTLE_OPS_TOTAL].max =
427 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
428 cfg.buckets[THROTTLE_OPS_READ].max =
429 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
430 cfg.buckets[THROTTLE_OPS_WRITE].max =
431 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
433 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
435 if (!check_throttle_config(&cfg, &error)) {
436 error_propagate(errp, error);
440 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
441 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
442 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
443 error_setg(errp, "werror is not supported by this bus type");
447 on_write_error = parse_block_error_action(buf, 0, &error);
448 if (error_is_set(&error)) {
449 error_propagate(errp, error);
454 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
455 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
456 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
457 error_report("rerror is not supported by this bus type");
461 on_read_error = parse_block_error_action(buf, 1, &error);
462 if (error_is_set(&error)) {
463 error_propagate(errp, error);
469 dinfo = g_malloc0(sizeof(*dinfo));
470 dinfo->id = g_strdup(qemu_opts_id(opts));
471 dinfo->bdrv = bdrv_new(dinfo->id);
472 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
473 dinfo->bdrv->read_only = ro;
476 if (serial != NULL) {
477 dinfo->serial = g_strdup(serial);
479 QTAILQ_INSERT_TAIL(&drives, dinfo, next);
481 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
483 /* disk I/O throttling */
484 if (throttle_enabled(&cfg)) {
485 bdrv_io_limits_enable(dinfo->bdrv);
486 bdrv_set_io_limits(dinfo->bdrv, &cfg);
489 if (!file || !*file) {
490 if (has_driver_specific_opts) {
499 /* always use cache=unsafe with snapshot */
500 bdrv_flags &= ~BDRV_O_CACHE_MASK;
501 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
505 bdrv_flags |= BDRV_O_COPY_ON_READ;
508 if (runstate_check(RUN_STATE_INMIGRATE)) {
509 bdrv_flags |= BDRV_O_INCOMING;
512 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
515 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
518 error_setg(errp, "could not open disk image %s: %s",
519 file ?: dinfo->id, error_get_pretty(error));
524 if (bdrv_key_required(dinfo->bdrv))
533 bdrv_unref(dinfo->bdrv);
535 QTAILQ_REMOVE(&drives, dinfo, next);
544 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
548 value = qemu_opt_get(opts, from);
550 qemu_opt_set(opts, to, value);
551 qemu_opt_unset(opts, from);
555 QemuOptsList qemu_legacy_drive_opts = {
557 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
561 .type = QEMU_OPT_NUMBER,
562 .help = "bus number",
565 .type = QEMU_OPT_NUMBER,
566 .help = "unit number (i.e. lun for scsi)",
569 .type = QEMU_OPT_NUMBER,
570 .help = "index number",
573 .type = QEMU_OPT_STRING,
574 .help = "media type (disk, cdrom)",
577 .type = QEMU_OPT_STRING,
578 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
581 .type = QEMU_OPT_NUMBER,
582 .help = "number of cylinders (ide disk geometry)",
585 .type = QEMU_OPT_NUMBER,
586 .help = "number of heads (ide disk geometry)",
589 .type = QEMU_OPT_NUMBER,
590 .help = "number of sectors (ide disk geometry)",
593 .type = QEMU_OPT_STRING,
594 .help = "chs translation (auto, lba, none)",
597 .type = QEMU_OPT_BOOL,
598 .help = "(deprecated, ignored)",
601 .type = QEMU_OPT_STRING,
602 .help = "pci address (virtio only)",
605 /* Options that are passed on, but have special semantics with -drive */
608 .type = QEMU_OPT_BOOL,
609 .help = "open drive file as read-only",
611 .name = "copy-on-read",
612 .type = QEMU_OPT_BOOL,
613 .help = "copy read data from backing file into image file",
616 { /* end of list */ }
620 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
623 DriveInfo *dinfo = NULL;
625 QemuOpts *legacy_opts;
626 DriveMediaType media = MEDIA_DISK;
627 BlockInterfaceType type;
628 int cyls, heads, secs, translation;
629 int max_devs, bus_id, unit_id, index;
631 bool read_only = false;
633 Error *local_err = NULL;
635 /* Change legacy command line options into QMP ones */
636 qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
637 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
638 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
640 qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
641 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
642 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
644 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max");
645 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max");
646 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max");
648 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max");
649 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
650 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
652 qemu_opt_rename(all_opts,
653 "iops_size", "throttling.iops-size");
655 qemu_opt_rename(all_opts, "readonly", "read-only");
657 value = qemu_opt_get(all_opts, "cache");
661 if (bdrv_parse_cache_flags(value, &flags) != 0) {
662 error_report("invalid cache option");
666 /* Specific options take precedence */
667 if (!qemu_opt_get(all_opts, "cache.writeback")) {
668 qemu_opt_set_bool(all_opts, "cache.writeback",
669 !!(flags & BDRV_O_CACHE_WB));
671 if (!qemu_opt_get(all_opts, "cache.direct")) {
672 qemu_opt_set_bool(all_opts, "cache.direct",
673 !!(flags & BDRV_O_NOCACHE));
675 if (!qemu_opt_get(all_opts, "cache.no-flush")) {
676 qemu_opt_set_bool(all_opts, "cache.no-flush",
677 !!(flags & BDRV_O_NO_FLUSH));
679 qemu_opt_unset(all_opts, "cache");
682 /* Get a QDict for processing the options */
683 bs_opts = qdict_new();
684 qemu_opts_to_qdict(all_opts, bs_opts);
686 legacy_opts = qemu_opts_create_nofail(&qemu_legacy_drive_opts);
687 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
688 if (error_is_set(&local_err)) {
689 qerror_report_err(local_err);
690 error_free(local_err);
694 /* Deprecated option boot=[on|off] */
695 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
696 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
697 "ignored. Future versions will reject this parameter. Please "
698 "update your scripts.\n");
702 value = qemu_opt_get(legacy_opts, "media");
704 if (!strcmp(value, "disk")) {
706 } else if (!strcmp(value, "cdrom")) {
710 error_report("'%s' invalid media", value);
715 /* copy-on-read is disabled with a warning for read-only devices */
716 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
717 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
719 if (read_only && copy_on_read) {
720 error_report("warning: disabling copy-on-read on read-only drive");
721 copy_on_read = false;
724 qdict_put(bs_opts, "read-only",
725 qstring_from_str(read_only ? "on" : "off"));
726 qdict_put(bs_opts, "copy-on-read",
727 qstring_from_str(copy_on_read ? "on" :"off"));
729 /* Controller type */
730 value = qemu_opt_get(legacy_opts, "if");
733 type < IF_COUNT && strcmp(value, if_name[type]);
736 if (type == IF_COUNT) {
737 error_report("unsupported bus type '%s'", value);
741 type = block_default_type;
745 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
746 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
747 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
749 if (cyls || heads || secs) {
751 error_report("invalid physical cyls number");
755 error_report("invalid physical heads number");
759 error_report("invalid physical secs number");
764 translation = BIOS_ATA_TRANSLATION_AUTO;
765 value = qemu_opt_get(legacy_opts, "trans");
768 error_report("'%s' trans must be used with cyls, heads and secs",
772 if (!strcmp(value, "none")) {
773 translation = BIOS_ATA_TRANSLATION_NONE;
774 } else if (!strcmp(value, "lba")) {
775 translation = BIOS_ATA_TRANSLATION_LBA;
776 } else if (!strcmp(value, "auto")) {
777 translation = BIOS_ATA_TRANSLATION_AUTO;
779 error_report("'%s' invalid translation type", value);
784 if (media == MEDIA_CDROM) {
785 if (cyls || secs || heads) {
786 error_report("CHS can't be set with media=cdrom");
791 /* Device address specified by bus/unit or index.
792 * If none was specified, try to find the first free one. */
793 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
794 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
795 index = qemu_opt_get_number(legacy_opts, "index", -1);
797 max_devs = if_max_devs[type];
800 if (bus_id != 0 || unit_id != -1) {
801 error_report("index cannot be used with bus and unit");
804 bus_id = drive_index_to_bus_id(type, index);
805 unit_id = drive_index_to_unit_id(type, index);
810 while (drive_get(type, bus_id, unit_id) != NULL) {
812 if (max_devs && unit_id >= max_devs) {
819 if (max_devs && unit_id >= max_devs) {
820 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
824 if (drive_get(type, bus_id, unit_id) != NULL) {
825 error_report("drive with bus=%d, unit=%d (index=%d) exists",
826 bus_id, unit_id, index);
830 /* no id supplied -> create one */
831 if (qemu_opts_id(all_opts) == NULL) {
833 const char *mediastr = "";
834 if (type == IF_IDE || type == IF_SCSI) {
835 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
838 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
841 new_id = g_strdup_printf("%s%s%i", if_name[type],
844 qdict_put(bs_opts, "id", qstring_from_str(new_id));
848 /* Add virtio block device */
849 devaddr = qemu_opt_get(legacy_opts, "addr");
850 if (devaddr && type != IF_VIRTIO) {
851 error_report("addr is not supported by this bus type");
855 if (type == IF_VIRTIO) {
857 devopts = qemu_opts_create_nofail(qemu_find_opts("device"));
858 if (arch_type == QEMU_ARCH_S390X) {
859 qemu_opt_set(devopts, "driver", "virtio-blk-s390");
861 qemu_opt_set(devopts, "driver", "virtio-blk-pci");
863 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"));
865 qemu_opt_set(devopts, "addr", devaddr);
869 /* Actual block device init: Functionality shared with blockdev-add */
870 dinfo = blockdev_init(bs_opts, type, &local_err);
873 if (error_is_set(&local_err)) {
874 qerror_report_err(local_err);
875 error_free(local_err);
879 assert(!error_is_set(&local_err));
882 /* Set legacy DriveInfo fields */
883 dinfo->enable_auto_del = true;
884 dinfo->opts = all_opts;
887 dinfo->heads = heads;
889 dinfo->trans = translation;
892 dinfo->unit = unit_id;
893 dinfo->devaddr = devaddr;
900 dinfo->media_cd = media == MEDIA_CDROM;
907 qemu_opts_del(legacy_opts);
912 void do_commit(Monitor *mon, const QDict *qdict)
914 const char *device = qdict_get_str(qdict, "device");
915 BlockDriverState *bs;
918 if (!strcmp(device, "all")) {
919 ret = bdrv_commit_all();
921 bs = bdrv_find(device);
923 monitor_printf(mon, "Device '%s' not found\n", device);
926 ret = bdrv_commit(bs);
929 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
934 static void blockdev_do_action(int kind, void *data, Error **errp)
936 TransactionAction action;
937 TransactionActionList list;
941 list.value = &action;
943 qmp_transaction(&list, errp);
946 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
947 bool has_format, const char *format,
948 bool has_mode, enum NewImageMode mode,
951 BlockdevSnapshot snapshot = {
952 .device = (char *) device,
953 .snapshot_file = (char *) snapshot_file,
954 .has_format = has_format,
955 .format = (char *) format,
956 .has_mode = has_mode,
959 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
963 void qmp_blockdev_snapshot_internal_sync(const char *device,
967 BlockdevSnapshotInternal snapshot = {
968 .device = (char *) device,
969 .name = (char *) name
972 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
976 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
983 BlockDriverState *bs = bdrv_find(device);
985 Error *local_err = NULL;
986 SnapshotInfo *info = NULL;
990 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1003 error_setg(errp, "Name or id must be provided");
1007 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1008 if (error_is_set(&local_err)) {
1009 error_propagate(errp, local_err);
1014 "Snapshot with id '%s' and name '%s' does not exist on "
1016 STR_OR_NULL(id), STR_OR_NULL(name), device);
1020 bdrv_snapshot_delete(bs, id, name, &local_err);
1021 if (error_is_set(&local_err)) {
1022 error_propagate(errp, local_err);
1026 info = g_malloc0(sizeof(SnapshotInfo));
1027 info->id = g_strdup(sn.id_str);
1028 info->name = g_strdup(sn.name);
1029 info->date_nsec = sn.date_nsec;
1030 info->date_sec = sn.date_sec;
1031 info->vm_state_size = sn.vm_state_size;
1032 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1033 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1038 /* New and old BlockDriverState structs for group snapshots */
1040 typedef struct BlkTransactionState BlkTransactionState;
1042 /* Only prepare() may fail. In a single transaction, only one of commit() or
1043 abort() will be called, clean() will always be called if it present. */
1044 typedef struct BdrvActionOps {
1045 /* Size of state struct, in bytes. */
1046 size_t instance_size;
1047 /* Prepare the work, must NOT be NULL. */
1048 void (*prepare)(BlkTransactionState *common, Error **errp);
1049 /* Commit the changes, can be NULL. */
1050 void (*commit)(BlkTransactionState *common);
1051 /* Abort the changes on fail, can be NULL. */
1052 void (*abort)(BlkTransactionState *common);
1053 /* Clean up resource in the end, can be NULL. */
1054 void (*clean)(BlkTransactionState *common);
1058 * This structure must be arranged as first member in child type, assuming
1059 * that compiler will also arrange it to the same address with parent instance.
1060 * Later it will be used in free().
1062 struct BlkTransactionState {
1063 TransactionAction *action;
1064 const BdrvActionOps *ops;
1065 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1068 /* internal snapshot private data */
1069 typedef struct InternalSnapshotState {
1070 BlkTransactionState common;
1071 BlockDriverState *bs;
1072 QEMUSnapshotInfo sn;
1073 } InternalSnapshotState;
1075 static void internal_snapshot_prepare(BlkTransactionState *common,
1080 BlockDriverState *bs;
1081 QEMUSnapshotInfo old_sn, *sn;
1084 BlockdevSnapshotInternal *internal;
1085 InternalSnapshotState *state;
1088 g_assert(common->action->kind ==
1089 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1090 internal = common->action->blockdev_snapshot_internal_sync;
1091 state = DO_UPCAST(InternalSnapshotState, common, common);
1093 /* 1. parse input */
1094 device = internal->device;
1095 name = internal->name;
1097 /* 2. check for validation */
1098 bs = bdrv_find(device);
1100 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1104 if (!bdrv_is_inserted(bs)) {
1105 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1109 if (bdrv_is_read_only(bs)) {
1110 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1114 if (!bdrv_can_snapshot(bs)) {
1115 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1116 bs->drv->format_name, device, "internal snapshot");
1120 if (!strlen(name)) {
1121 error_setg(errp, "Name is empty");
1125 /* check whether a snapshot with name exist */
1126 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp);
1127 if (error_is_set(errp)) {
1131 "Snapshot with name '%s' already exists on device '%s'",
1136 /* 3. take the snapshot */
1138 pstrcpy(sn->name, sizeof(sn->name), name);
1139 qemu_gettimeofday(&tv);
1140 sn->date_sec = tv.tv_sec;
1141 sn->date_nsec = tv.tv_usec * 1000;
1142 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1144 ret1 = bdrv_snapshot_create(bs, sn);
1146 error_setg_errno(errp, -ret1,
1147 "Failed to create snapshot '%s' on device '%s'",
1152 /* 4. succeed, mark a snapshot is created */
1156 static void internal_snapshot_abort(BlkTransactionState *common)
1158 InternalSnapshotState *state =
1159 DO_UPCAST(InternalSnapshotState, common, common);
1160 BlockDriverState *bs = state->bs;
1161 QEMUSnapshotInfo *sn = &state->sn;
1162 Error *local_error = NULL;
1168 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1169 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1170 "device '%s' in abort: %s",
1173 bdrv_get_device_name(bs),
1174 error_get_pretty(local_error));
1175 error_free(local_error);
1179 /* external snapshot private data */
1180 typedef struct ExternalSnapshotState {
1181 BlkTransactionState common;
1182 BlockDriverState *old_bs;
1183 BlockDriverState *new_bs;
1184 } ExternalSnapshotState;
1186 static void external_snapshot_prepare(BlkTransactionState *common,
1191 Error *local_err = NULL;
1193 const char *new_image_file;
1194 const char *format = "qcow2";
1195 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1196 ExternalSnapshotState *state =
1197 DO_UPCAST(ExternalSnapshotState, common, common);
1198 TransactionAction *action = common->action;
1200 /* get parameters */
1201 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1203 device = action->blockdev_snapshot_sync->device;
1204 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1205 if (action->blockdev_snapshot_sync->has_format) {
1206 format = action->blockdev_snapshot_sync->format;
1208 if (action->blockdev_snapshot_sync->has_mode) {
1209 mode = action->blockdev_snapshot_sync->mode;
1212 /* start processing */
1213 drv = bdrv_find_format(format);
1215 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1219 state->old_bs = bdrv_find(device);
1220 if (!state->old_bs) {
1221 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1225 if (!bdrv_is_inserted(state->old_bs)) {
1226 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1230 if (bdrv_in_use(state->old_bs)) {
1231 error_set(errp, QERR_DEVICE_IN_USE, device);
1235 if (!bdrv_is_read_only(state->old_bs)) {
1236 if (bdrv_flush(state->old_bs)) {
1237 error_set(errp, QERR_IO_ERROR);
1242 if (bdrv_check_ext_snapshot(state->old_bs) != EXT_SNAPSHOT_ALLOWED) {
1243 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1247 flags = state->old_bs->open_flags;
1249 /* create new image w/backing file */
1250 if (mode != NEW_IMAGE_MODE_EXISTING) {
1251 bdrv_img_create(new_image_file, format,
1252 state->old_bs->filename,
1253 state->old_bs->drv->format_name,
1254 NULL, -1, flags, &local_err, false);
1255 if (error_is_set(&local_err)) {
1256 error_propagate(errp, local_err);
1261 /* We will manually add the backing_hd field to the bs later */
1262 state->new_bs = bdrv_new("");
1263 /* TODO Inherit bs->options or only take explicit options with an
1264 * extended QMP command? */
1265 ret = bdrv_open(state->new_bs, new_image_file, NULL,
1266 flags | BDRV_O_NO_BACKING, drv, &local_err);
1268 error_propagate(errp, local_err);
1272 static void external_snapshot_commit(BlkTransactionState *common)
1274 ExternalSnapshotState *state =
1275 DO_UPCAST(ExternalSnapshotState, common, common);
1277 /* This removes our old bs and adds the new bs */
1278 bdrv_append(state->new_bs, state->old_bs);
1279 /* We don't need (or want) to use the transactional
1280 * bdrv_reopen_multiple() across all the entries at once, because we
1281 * don't want to abort all of them if one of them fails the reopen */
1282 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1286 static void external_snapshot_abort(BlkTransactionState *common)
1288 ExternalSnapshotState *state =
1289 DO_UPCAST(ExternalSnapshotState, common, common);
1290 if (state->new_bs) {
1291 bdrv_unref(state->new_bs);
1295 typedef struct DriveBackupState {
1296 BlkTransactionState common;
1297 BlockDriverState *bs;
1301 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1303 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1304 DriveBackup *backup;
1305 Error *local_err = NULL;
1307 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1308 backup = common->action->drive_backup;
1310 qmp_drive_backup(backup->device, backup->target,
1311 backup->has_format, backup->format,
1313 backup->has_mode, backup->mode,
1314 backup->has_speed, backup->speed,
1315 backup->has_on_source_error, backup->on_source_error,
1316 backup->has_on_target_error, backup->on_target_error,
1318 if (error_is_set(&local_err)) {
1319 error_propagate(errp, local_err);
1325 state->bs = bdrv_find(backup->device);
1326 state->job = state->bs->job;
1329 static void drive_backup_abort(BlkTransactionState *common)
1331 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1332 BlockDriverState *bs = state->bs;
1334 /* Only cancel if it's the job we started */
1335 if (bs && bs->job && bs->job == state->job) {
1336 block_job_cancel_sync(bs->job);
1340 static void abort_prepare(BlkTransactionState *common, Error **errp)
1342 error_setg(errp, "Transaction aborted using Abort action");
1345 static void abort_commit(BlkTransactionState *common)
1347 g_assert_not_reached(); /* this action never succeeds */
1350 static const BdrvActionOps actions[] = {
1351 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1352 .instance_size = sizeof(ExternalSnapshotState),
1353 .prepare = external_snapshot_prepare,
1354 .commit = external_snapshot_commit,
1355 .abort = external_snapshot_abort,
1357 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1358 .instance_size = sizeof(DriveBackupState),
1359 .prepare = drive_backup_prepare,
1360 .abort = drive_backup_abort,
1362 [TRANSACTION_ACTION_KIND_ABORT] = {
1363 .instance_size = sizeof(BlkTransactionState),
1364 .prepare = abort_prepare,
1365 .commit = abort_commit,
1367 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1368 .instance_size = sizeof(InternalSnapshotState),
1369 .prepare = internal_snapshot_prepare,
1370 .abort = internal_snapshot_abort,
1375 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
1376 * then we do not pivot any of the devices in the group, and abandon the
1379 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1381 TransactionActionList *dev_entry = dev_list;
1382 BlkTransactionState *state, *next;
1383 Error *local_err = NULL;
1385 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1386 QSIMPLEQ_INIT(&snap_bdrv_states);
1388 /* drain all i/o before any snapshots */
1391 /* We don't do anything in this loop that commits us to the snapshot */
1392 while (NULL != dev_entry) {
1393 TransactionAction *dev_info = NULL;
1394 const BdrvActionOps *ops;
1396 dev_info = dev_entry->value;
1397 dev_entry = dev_entry->next;
1399 assert(dev_info->kind < ARRAY_SIZE(actions));
1401 ops = &actions[dev_info->kind];
1402 assert(ops->instance_size > 0);
1404 state = g_malloc0(ops->instance_size);
1406 state->action = dev_info;
1407 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1409 state->ops->prepare(state, &local_err);
1410 if (error_is_set(&local_err)) {
1411 error_propagate(errp, local_err);
1412 goto delete_and_fail;
1416 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1417 if (state->ops->commit) {
1418 state->ops->commit(state);
1427 * failure, and it is all-or-none; abandon each new bs, and keep using
1428 * the original bs for all images
1430 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1431 if (state->ops->abort) {
1432 state->ops->abort(state);
1436 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1437 if (state->ops->clean) {
1438 state->ops->clean(state);
1445 static void eject_device(BlockDriverState *bs, int force, Error **errp)
1447 if (bdrv_in_use(bs)) {
1448 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
1451 if (!bdrv_dev_has_removable_media(bs)) {
1452 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
1456 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
1457 bdrv_dev_eject_request(bs, force);
1459 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
1467 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1469 BlockDriverState *bs;
1471 bs = bdrv_find(device);
1473 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1477 eject_device(bs, force, errp);
1480 void qmp_block_passwd(const char *device, const char *password, Error **errp)
1482 BlockDriverState *bs;
1485 bs = bdrv_find(device);
1487 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1491 err = bdrv_set_key(bs, password);
1492 if (err == -EINVAL) {
1493 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1495 } else if (err < 0) {
1496 error_set(errp, QERR_INVALID_PASSWORD);
1501 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1502 int bdrv_flags, BlockDriver *drv,
1503 const char *password, Error **errp)
1505 Error *local_err = NULL;
1508 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err);
1510 error_propagate(errp, local_err);
1514 if (bdrv_key_required(bs)) {
1516 if (bdrv_set_key(bs, password) < 0) {
1517 error_set(errp, QERR_INVALID_PASSWORD);
1520 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1521 bdrv_get_encrypted_filename(bs));
1523 } else if (password) {
1524 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1528 void qmp_change_blockdev(const char *device, const char *filename,
1529 bool has_format, const char *format, Error **errp)
1531 BlockDriverState *bs;
1532 BlockDriver *drv = NULL;
1536 bs = bdrv_find(device);
1538 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1543 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1545 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1550 eject_device(bs, 0, &err);
1551 if (error_is_set(&err)) {
1552 error_propagate(errp, err);
1556 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1557 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1559 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1562 /* throttling disk I/O limits */
1563 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1570 bool has_bps_rd_max,
1572 bool has_bps_wr_max,
1576 bool has_iops_rd_max,
1577 int64_t iops_rd_max,
1578 bool has_iops_wr_max,
1579 int64_t iops_wr_max,
1581 int64_t iops_size, Error **errp)
1584 BlockDriverState *bs;
1586 bs = bdrv_find(device);
1588 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1592 memset(&cfg, 0, sizeof(cfg));
1593 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1594 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1595 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1597 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1598 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1599 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1602 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1604 if (has_bps_rd_max) {
1605 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1607 if (has_bps_wr_max) {
1608 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1611 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1613 if (has_iops_rd_max) {
1614 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1616 if (has_iops_wr_max) {
1617 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1620 if (has_iops_size) {
1621 cfg.op_size = iops_size;
1624 if (!check_throttle_config(&cfg, errp)) {
1628 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1629 bdrv_io_limits_enable(bs);
1630 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1631 bdrv_io_limits_disable(bs);
1634 if (bs->io_limits_enabled) {
1635 bdrv_set_io_limits(bs, &cfg);
1639 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1641 const char *id = qdict_get_str(qdict, "id");
1642 BlockDriverState *bs;
1646 qerror_report(QERR_DEVICE_NOT_FOUND, id);
1649 if (bdrv_in_use(bs)) {
1650 qerror_report(QERR_DEVICE_IN_USE, id);
1654 /* quiesce block driver; prevent further io */
1659 /* if we have a device attached to this BlockDriverState
1660 * then we need to make the drive anonymous until the device
1661 * can be removed. If this is a drive with no device backing
1662 * then we can just get rid of the block driver state right here.
1664 if (bdrv_get_attached_dev(bs)) {
1667 /* Further I/O must not pause the guest */
1668 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1669 BLOCKDEV_ON_ERROR_REPORT);
1671 drive_uninit(drive_get_by_blockdev(bs));
1677 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1679 BlockDriverState *bs;
1682 bs = bdrv_find(device);
1684 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1689 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1693 /* complete all in-flight operations before resizing the device */
1696 ret = bdrv_truncate(bs, size);
1701 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1704 error_set(errp, QERR_UNSUPPORTED);
1707 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1710 error_set(errp, QERR_DEVICE_IN_USE, device);
1713 error_setg_errno(errp, -ret, "Could not resize");
1718 static void block_job_cb(void *opaque, int ret)
1720 BlockDriverState *bs = opaque;
1723 trace_block_job_cb(bs, bs->job, ret);
1726 obj = qobject_from_block_job(bs->job);
1728 QDict *dict = qobject_to_qdict(obj);
1729 qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1732 if (block_job_is_cancelled(bs->job)) {
1733 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1735 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1737 qobject_decref(obj);
1739 bdrv_put_ref_bh_schedule(bs);
1742 void qmp_block_stream(const char *device, bool has_base,
1743 const char *base, bool has_speed, int64_t speed,
1744 bool has_on_error, BlockdevOnError on_error,
1747 BlockDriverState *bs;
1748 BlockDriverState *base_bs = NULL;
1749 Error *local_err = NULL;
1751 if (!has_on_error) {
1752 on_error = BLOCKDEV_ON_ERROR_REPORT;
1755 bs = bdrv_find(device);
1757 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1762 base_bs = bdrv_find_backing_image(bs, base);
1763 if (base_bs == NULL) {
1764 error_set(errp, QERR_BASE_NOT_FOUND, base);
1769 stream_start(bs, base_bs, base, has_speed ? speed : 0,
1770 on_error, block_job_cb, bs, &local_err);
1771 if (error_is_set(&local_err)) {
1772 error_propagate(errp, local_err);
1776 trace_qmp_block_stream(bs, bs->job);
1779 void qmp_block_commit(const char *device,
1780 bool has_base, const char *base, const char *top,
1781 bool has_speed, int64_t speed,
1784 BlockDriverState *bs;
1785 BlockDriverState *base_bs, *top_bs;
1786 Error *local_err = NULL;
1787 /* This will be part of the QMP command, if/when the
1788 * BlockdevOnError change for blkmirror makes it in
1790 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1796 /* drain all i/o before commits */
1799 bs = bdrv_find(device);
1801 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1805 /* default top_bs is the active layer */
1809 if (strcmp(bs->filename, top) != 0) {
1810 top_bs = bdrv_find_backing_image(bs, top);
1814 if (top_bs == NULL) {
1815 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1819 if (has_base && base) {
1820 base_bs = bdrv_find_backing_image(top_bs, base);
1822 base_bs = bdrv_find_base(top_bs);
1825 if (base_bs == NULL) {
1826 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1830 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1832 if (local_err != NULL) {
1833 error_propagate(errp, local_err);
1838 void qmp_drive_backup(const char *device, const char *target,
1839 bool has_format, const char *format,
1840 enum MirrorSyncMode sync,
1841 bool has_mode, enum NewImageMode mode,
1842 bool has_speed, int64_t speed,
1843 bool has_on_source_error, BlockdevOnError on_source_error,
1844 bool has_on_target_error, BlockdevOnError on_target_error,
1847 BlockDriverState *bs;
1848 BlockDriverState *target_bs;
1849 BlockDriverState *source = NULL;
1850 BlockDriver *drv = NULL;
1851 Error *local_err = NULL;
1859 if (!has_on_source_error) {
1860 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1862 if (!has_on_target_error) {
1863 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1866 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1869 bs = bdrv_find(device);
1871 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1875 if (!bdrv_is_inserted(bs)) {
1876 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1881 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1884 drv = bdrv_find_format(format);
1886 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1891 if (bdrv_in_use(bs)) {
1892 error_set(errp, QERR_DEVICE_IN_USE, device);
1896 flags = bs->open_flags | BDRV_O_RDWR;
1898 /* See if we have a backing HD we can use to create our new image
1900 if (sync == MIRROR_SYNC_MODE_TOP) {
1901 source = bs->backing_hd;
1903 sync = MIRROR_SYNC_MODE_FULL;
1906 if (sync == MIRROR_SYNC_MODE_NONE) {
1910 size = bdrv_getlength(bs);
1912 error_setg_errno(errp, -size, "bdrv_getlength failed");
1916 if (mode != NEW_IMAGE_MODE_EXISTING) {
1917 assert(format && drv);
1919 bdrv_img_create(target, format, source->filename,
1920 source->drv->format_name, NULL,
1921 size, flags, &local_err, false);
1923 bdrv_img_create(target, format, NULL, NULL, NULL,
1924 size, flags, &local_err, false);
1928 if (error_is_set(&local_err)) {
1929 error_propagate(errp, local_err);
1933 target_bs = bdrv_new("");
1934 ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err);
1936 bdrv_unref(target_bs);
1937 error_propagate(errp, local_err);
1941 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1942 block_job_cb, bs, &local_err);
1943 if (local_err != NULL) {
1944 bdrv_unref(target_bs);
1945 error_propagate(errp, local_err);
1950 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
1952 void qmp_drive_mirror(const char *device, const char *target,
1953 bool has_format, const char *format,
1954 enum MirrorSyncMode sync,
1955 bool has_mode, enum NewImageMode mode,
1956 bool has_speed, int64_t speed,
1957 bool has_granularity, uint32_t granularity,
1958 bool has_buf_size, int64_t buf_size,
1959 bool has_on_source_error, BlockdevOnError on_source_error,
1960 bool has_on_target_error, BlockdevOnError on_target_error,
1963 BlockDriverState *bs;
1964 BlockDriverState *source, *target_bs;
1965 BlockDriver *drv = NULL;
1966 Error *local_err = NULL;
1974 if (!has_on_source_error) {
1975 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1977 if (!has_on_target_error) {
1978 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1981 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1983 if (!has_granularity) {
1986 if (!has_buf_size) {
1987 buf_size = DEFAULT_MIRROR_BUF_SIZE;
1990 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
1991 error_set(errp, QERR_INVALID_PARAMETER, device);
1994 if (granularity & (granularity - 1)) {
1995 error_set(errp, QERR_INVALID_PARAMETER, device);
1999 bs = bdrv_find(device);
2001 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2005 if (!bdrv_is_inserted(bs)) {
2006 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2011 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2014 drv = bdrv_find_format(format);
2016 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2021 if (bdrv_in_use(bs)) {
2022 error_set(errp, QERR_DEVICE_IN_USE, device);
2026 flags = bs->open_flags | BDRV_O_RDWR;
2027 source = bs->backing_hd;
2028 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2029 sync = MIRROR_SYNC_MODE_FULL;
2031 if (sync == MIRROR_SYNC_MODE_NONE) {
2035 size = bdrv_getlength(bs);
2037 error_setg_errno(errp, -size, "bdrv_getlength failed");
2041 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2042 && mode != NEW_IMAGE_MODE_EXISTING)
2044 /* create new image w/o backing file */
2045 assert(format && drv);
2046 bdrv_img_create(target, format,
2047 NULL, NULL, NULL, size, flags, &local_err, false);
2050 case NEW_IMAGE_MODE_EXISTING:
2052 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2053 /* create new image with backing file */
2054 bdrv_img_create(target, format,
2056 source->drv->format_name,
2057 NULL, size, flags, &local_err, false);
2064 if (error_is_set(&local_err)) {
2065 error_propagate(errp, local_err);
2069 /* Mirroring takes care of copy-on-write using the source's backing
2072 target_bs = bdrv_new("");
2073 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
2076 bdrv_unref(target_bs);
2077 error_propagate(errp, local_err);
2081 mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
2082 on_source_error, on_target_error,
2083 block_job_cb, bs, &local_err);
2084 if (local_err != NULL) {
2085 bdrv_unref(target_bs);
2086 error_propagate(errp, local_err);
2091 static BlockJob *find_block_job(const char *device)
2093 BlockDriverState *bs;
2095 bs = bdrv_find(device);
2096 if (!bs || !bs->job) {
2102 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2104 BlockJob *job = find_block_job(device);
2107 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2111 block_job_set_speed(job, speed, errp);
2114 void qmp_block_job_cancel(const char *device,
2115 bool has_force, bool force, Error **errp)
2117 BlockJob *job = find_block_job(device);
2124 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2127 if (job->paused && !force) {
2128 error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
2132 trace_qmp_block_job_cancel(job);
2133 block_job_cancel(job);
2136 void qmp_block_job_pause(const char *device, Error **errp)
2138 BlockJob *job = find_block_job(device);
2141 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2145 trace_qmp_block_job_pause(job);
2146 block_job_pause(job);
2149 void qmp_block_job_resume(const char *device, Error **errp)
2151 BlockJob *job = find_block_job(device);
2154 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2158 trace_qmp_block_job_resume(job);
2159 block_job_resume(job);
2162 void qmp_block_job_complete(const char *device, Error **errp)
2164 BlockJob *job = find_block_job(device);
2167 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2171 trace_qmp_block_job_complete(job);
2172 block_job_complete(job, errp);
2175 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2177 QmpOutputVisitor *ov = qmp_output_visitor_new();
2180 Error *local_err = NULL;
2182 /* Require an ID in the top level */
2183 if (!options->has_id) {
2184 error_setg(errp, "Block device needs an ID");
2188 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with
2189 * cache.direct=false instead of silently switching to aio=threads, except
2190 * if called from drive_init.
2192 * For now, simply forbidding the combination for all drivers will do. */
2193 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2194 bool direct = options->cache->has_direct && options->cache->direct;
2195 if (!options->has_cache && !direct) {
2196 error_setg(errp, "aio=native requires cache.direct=true");
2201 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2202 &options, NULL, &local_err);
2203 if (error_is_set(&local_err)) {
2204 error_propagate(errp, local_err);
2208 obj = qmp_output_get_qobject(ov);
2209 qdict = qobject_to_qdict(obj);
2211 qdict_flatten(qdict);
2213 blockdev_init(qdict, IF_NONE, &local_err);
2214 if (error_is_set(&local_err)) {
2215 error_propagate(errp, local_err);
2220 qmp_output_visitor_cleanup(ov);
2223 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
2225 BlockJobInfoList **prev = opaque;
2226 BlockJob *job = bs->job;
2229 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2230 elem->value = block_job_query(bs->job);
2231 (*prev)->next = elem;
2236 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2238 /* Dummy is a fake list element for holding the head pointer */
2239 BlockJobInfoList dummy = {};
2240 BlockJobInfoList *prev = &dummy;
2241 bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
2245 QemuOptsList qemu_common_drive_opts = {
2247 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2251 .type = QEMU_OPT_BOOL,
2252 .help = "enable/disable snapshot mode",
2255 .type = QEMU_OPT_STRING,
2256 .help = "disk image",
2259 .type = QEMU_OPT_STRING,
2260 .help = "discard operation (ignore/off, unmap/on)",
2262 .name = "cache.writeback",
2263 .type = QEMU_OPT_BOOL,
2264 .help = "enables writeback mode for any caches",
2266 .name = "cache.direct",
2267 .type = QEMU_OPT_BOOL,
2268 .help = "enables use of O_DIRECT (bypass the host page cache)",
2270 .name = "cache.no-flush",
2271 .type = QEMU_OPT_BOOL,
2272 .help = "ignore any flush requests for the device",
2275 .type = QEMU_OPT_STRING,
2276 .help = "host AIO implementation (threads, native)",
2279 .type = QEMU_OPT_STRING,
2280 .help = "disk format (raw, qcow2, ...)",
2283 .type = QEMU_OPT_STRING,
2284 .help = "disk serial number",
2287 .type = QEMU_OPT_STRING,
2288 .help = "read error action",
2291 .type = QEMU_OPT_STRING,
2292 .help = "write error action",
2294 .name = "read-only",
2295 .type = QEMU_OPT_BOOL,
2296 .help = "open drive file as read-only",
2298 .name = "throttling.iops-total",
2299 .type = QEMU_OPT_NUMBER,
2300 .help = "limit total I/O operations per second",
2302 .name = "throttling.iops-read",
2303 .type = QEMU_OPT_NUMBER,
2304 .help = "limit read operations per second",
2306 .name = "throttling.iops-write",
2307 .type = QEMU_OPT_NUMBER,
2308 .help = "limit write operations per second",
2310 .name = "throttling.bps-total",
2311 .type = QEMU_OPT_NUMBER,
2312 .help = "limit total bytes per second",
2314 .name = "throttling.bps-read",
2315 .type = QEMU_OPT_NUMBER,
2316 .help = "limit read bytes per second",
2318 .name = "throttling.bps-write",
2319 .type = QEMU_OPT_NUMBER,
2320 .help = "limit write bytes per second",
2322 .name = "throttling.iops-total-max",
2323 .type = QEMU_OPT_NUMBER,
2324 .help = "I/O operations burst",
2326 .name = "throttling.iops-read-max",
2327 .type = QEMU_OPT_NUMBER,
2328 .help = "I/O operations read burst",
2330 .name = "throttling.iops-write-max",
2331 .type = QEMU_OPT_NUMBER,
2332 .help = "I/O operations write burst",
2334 .name = "throttling.bps-total-max",
2335 .type = QEMU_OPT_NUMBER,
2336 .help = "total bytes burst",
2338 .name = "throttling.bps-read-max",
2339 .type = QEMU_OPT_NUMBER,
2340 .help = "total bytes read burst",
2342 .name = "throttling.bps-write-max",
2343 .type = QEMU_OPT_NUMBER,
2344 .help = "total bytes write burst",
2346 .name = "throttling.iops-size",
2347 .type = QEMU_OPT_NUMBER,
2348 .help = "when limiting by iops max size of an I/O in bytes",
2350 .name = "copy-on-read",
2351 .type = QEMU_OPT_BOOL,
2352 .help = "copy read data from backing file into image file",
2354 { /* end of list */ }
2358 QemuOptsList qemu_drive_opts = {
2360 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2363 * no elements => accept any params
2364 * validation will happen later
2366 { /* end of list */ }