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(const char *file, QDict *bs_opts,
311 BlockInterfaceType type,
318 int on_read_error, on_write_error;
327 bool has_driver_specific_opts;
328 BlockDriver *drv = NULL;
330 /* Check common options by copying from bs_opts to opts, all other options
331 * stay in bs_opts for processing by bdrv_open(). */
332 id = qdict_get_try_str(bs_opts, "id");
333 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
334 if (error_is_set(&error)) {
335 error_propagate(errp, error);
339 qemu_opts_absorb_qdict(opts, bs_opts, &error);
340 if (error_is_set(&error)) {
341 error_propagate(errp, error);
346 qdict_del(bs_opts, "id");
349 has_driver_specific_opts = !!qdict_size(bs_opts);
351 /* extract parameters */
352 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
353 ro = qemu_opt_get_bool(opts, "read-only", 0);
354 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
356 serial = qemu_opt_get(opts, "serial");
358 if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
359 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
360 error_setg(errp, "invalid discard option");
365 if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
366 bdrv_flags |= BDRV_O_CACHE_WB;
368 if (qemu_opt_get_bool(opts, "cache.direct", false)) {
369 bdrv_flags |= BDRV_O_NOCACHE;
371 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
372 bdrv_flags |= BDRV_O_NO_FLUSH;
375 #ifdef CONFIG_LINUX_AIO
376 if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
377 if (!strcmp(buf, "native")) {
378 bdrv_flags |= BDRV_O_NATIVE_AIO;
379 } else if (!strcmp(buf, "threads")) {
380 /* this is the default */
382 error_setg(errp, "invalid aio option");
388 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
389 if (is_help_option(buf)) {
390 error_printf("Supported formats:");
391 bdrv_iterate_format(bdrv_format_print, NULL);
396 drv = bdrv_find_format(buf);
398 error_setg(errp, "'%s' invalid format", buf);
403 /* disk I/O throttling */
404 memset(&cfg, 0, sizeof(cfg));
405 cfg.buckets[THROTTLE_BPS_TOTAL].avg =
406 qemu_opt_get_number(opts, "throttling.bps-total", 0);
407 cfg.buckets[THROTTLE_BPS_READ].avg =
408 qemu_opt_get_number(opts, "throttling.bps-read", 0);
409 cfg.buckets[THROTTLE_BPS_WRITE].avg =
410 qemu_opt_get_number(opts, "throttling.bps-write", 0);
411 cfg.buckets[THROTTLE_OPS_TOTAL].avg =
412 qemu_opt_get_number(opts, "throttling.iops-total", 0);
413 cfg.buckets[THROTTLE_OPS_READ].avg =
414 qemu_opt_get_number(opts, "throttling.iops-read", 0);
415 cfg.buckets[THROTTLE_OPS_WRITE].avg =
416 qemu_opt_get_number(opts, "throttling.iops-write", 0);
418 cfg.buckets[THROTTLE_BPS_TOTAL].max =
419 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
420 cfg.buckets[THROTTLE_BPS_READ].max =
421 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
422 cfg.buckets[THROTTLE_BPS_WRITE].max =
423 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
424 cfg.buckets[THROTTLE_OPS_TOTAL].max =
425 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
426 cfg.buckets[THROTTLE_OPS_READ].max =
427 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
428 cfg.buckets[THROTTLE_OPS_WRITE].max =
429 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
431 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
433 if (!check_throttle_config(&cfg, &error)) {
434 error_propagate(errp, error);
438 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
439 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
440 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
441 error_setg(errp, "werror is not supported by this bus type");
445 on_write_error = parse_block_error_action(buf, 0, &error);
446 if (error_is_set(&error)) {
447 error_propagate(errp, error);
452 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
453 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
454 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
455 error_report("rerror is not supported by this bus type");
459 on_read_error = parse_block_error_action(buf, 1, &error);
460 if (error_is_set(&error)) {
461 error_propagate(errp, error);
467 dinfo = g_malloc0(sizeof(*dinfo));
468 dinfo->id = g_strdup(qemu_opts_id(opts));
469 dinfo->bdrv = bdrv_new(dinfo->id);
470 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
471 dinfo->bdrv->read_only = ro;
474 if (serial != NULL) {
475 dinfo->serial = g_strdup(serial);
477 QTAILQ_INSERT_TAIL(&drives, dinfo, next);
479 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
481 /* disk I/O throttling */
482 if (throttle_enabled(&cfg)) {
483 bdrv_io_limits_enable(dinfo->bdrv);
484 bdrv_set_io_limits(dinfo->bdrv, &cfg);
487 if (!file || !*file) {
488 if (has_driver_specific_opts) {
497 /* always use cache=unsafe with snapshot */
498 bdrv_flags &= ~BDRV_O_CACHE_MASK;
499 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
503 bdrv_flags |= BDRV_O_COPY_ON_READ;
506 if (runstate_check(RUN_STATE_INMIGRATE)) {
507 bdrv_flags |= BDRV_O_INCOMING;
510 bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
513 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
516 error_setg(errp, "could not open disk image %s: %s",
517 file ?: dinfo->id, error_get_pretty(error));
522 if (bdrv_key_required(dinfo->bdrv))
531 bdrv_unref(dinfo->bdrv);
533 QTAILQ_REMOVE(&drives, dinfo, next);
541 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
545 value = qemu_opt_get(opts, from);
547 qemu_opt_set(opts, to, value);
548 qemu_opt_unset(opts, from);
552 QemuOptsList qemu_legacy_drive_opts = {
554 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
558 .type = QEMU_OPT_NUMBER,
559 .help = "bus number",
562 .type = QEMU_OPT_NUMBER,
563 .help = "unit number (i.e. lun for scsi)",
566 .type = QEMU_OPT_NUMBER,
567 .help = "index number",
570 .type = QEMU_OPT_STRING,
571 .help = "media type (disk, cdrom)",
574 .type = QEMU_OPT_STRING,
575 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
578 .type = QEMU_OPT_NUMBER,
579 .help = "number of cylinders (ide disk geometry)",
582 .type = QEMU_OPT_NUMBER,
583 .help = "number of heads (ide disk geometry)",
586 .type = QEMU_OPT_NUMBER,
587 .help = "number of sectors (ide disk geometry)",
590 .type = QEMU_OPT_STRING,
591 .help = "chs translation (auto, lba, none)",
594 .type = QEMU_OPT_BOOL,
595 .help = "(deprecated, ignored)",
598 .type = QEMU_OPT_STRING,
599 .help = "pci address (virtio only)",
602 .type = QEMU_OPT_STRING,
606 /* Options that are passed on, but have special semantics with -drive */
609 .type = QEMU_OPT_BOOL,
610 .help = "open drive file as read-only",
612 .name = "copy-on-read",
613 .type = QEMU_OPT_BOOL,
614 .help = "copy read data from backing file into image file",
617 { /* end of list */ }
621 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
624 DriveInfo *dinfo = NULL;
626 QemuOpts *legacy_opts;
627 DriveMediaType media = MEDIA_DISK;
628 BlockInterfaceType type;
629 int cyls, heads, secs, translation;
630 int max_devs, bus_id, unit_id, index;
632 bool read_only = false;
634 const char *filename;
635 Error *local_err = NULL;
637 /* Change legacy command line options into QMP ones */
638 qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
639 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
640 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");
642 qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
643 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
644 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");
646 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max");
647 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max");
648 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max");
650 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max");
651 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
652 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
654 qemu_opt_rename(all_opts,
655 "iops_size", "throttling.iops-size");
657 qemu_opt_rename(all_opts, "readonly", "read-only");
659 value = qemu_opt_get(all_opts, "cache");
663 if (bdrv_parse_cache_flags(value, &flags) != 0) {
664 error_report("invalid cache option");
668 /* Specific options take precedence */
669 if (!qemu_opt_get(all_opts, "cache.writeback")) {
670 qemu_opt_set_bool(all_opts, "cache.writeback",
671 !!(flags & BDRV_O_CACHE_WB));
673 if (!qemu_opt_get(all_opts, "cache.direct")) {
674 qemu_opt_set_bool(all_opts, "cache.direct",
675 !!(flags & BDRV_O_NOCACHE));
677 if (!qemu_opt_get(all_opts, "cache.no-flush")) {
678 qemu_opt_set_bool(all_opts, "cache.no-flush",
679 !!(flags & BDRV_O_NO_FLUSH));
681 qemu_opt_unset(all_opts, "cache");
684 /* Get a QDict for processing the options */
685 bs_opts = qdict_new();
686 qemu_opts_to_qdict(all_opts, bs_opts);
688 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
690 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
691 if (error_is_set(&local_err)) {
692 qerror_report_err(local_err);
693 error_free(local_err);
697 /* Deprecated option boot=[on|off] */
698 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
699 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
700 "ignored. Future versions will reject this parameter. Please "
701 "update your scripts.\n");
705 value = qemu_opt_get(legacy_opts, "media");
707 if (!strcmp(value, "disk")) {
709 } else if (!strcmp(value, "cdrom")) {
713 error_report("'%s' invalid media", value);
718 /* copy-on-read is disabled with a warning for read-only devices */
719 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
720 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
722 if (read_only && copy_on_read) {
723 error_report("warning: disabling copy-on-read on read-only drive");
724 copy_on_read = false;
727 qdict_put(bs_opts, "read-only",
728 qstring_from_str(read_only ? "on" : "off"));
729 qdict_put(bs_opts, "copy-on-read",
730 qstring_from_str(copy_on_read ? "on" :"off"));
732 /* Controller type */
733 value = qemu_opt_get(legacy_opts, "if");
736 type < IF_COUNT && strcmp(value, if_name[type]);
739 if (type == IF_COUNT) {
740 error_report("unsupported bus type '%s'", value);
744 type = block_default_type;
748 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
749 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
750 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
752 if (cyls || heads || secs) {
754 error_report("invalid physical cyls number");
758 error_report("invalid physical heads number");
762 error_report("invalid physical secs number");
767 translation = BIOS_ATA_TRANSLATION_AUTO;
768 value = qemu_opt_get(legacy_opts, "trans");
771 error_report("'%s' trans must be used with cyls, heads and secs",
775 if (!strcmp(value, "none")) {
776 translation = BIOS_ATA_TRANSLATION_NONE;
777 } else if (!strcmp(value, "lba")) {
778 translation = BIOS_ATA_TRANSLATION_LBA;
779 } else if (!strcmp(value, "auto")) {
780 translation = BIOS_ATA_TRANSLATION_AUTO;
782 error_report("'%s' invalid translation type", value);
787 if (media == MEDIA_CDROM) {
788 if (cyls || secs || heads) {
789 error_report("CHS can't be set with media=cdrom");
794 /* Device address specified by bus/unit or index.
795 * If none was specified, try to find the first free one. */
796 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
797 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
798 index = qemu_opt_get_number(legacy_opts, "index", -1);
800 max_devs = if_max_devs[type];
803 if (bus_id != 0 || unit_id != -1) {
804 error_report("index cannot be used with bus and unit");
807 bus_id = drive_index_to_bus_id(type, index);
808 unit_id = drive_index_to_unit_id(type, index);
813 while (drive_get(type, bus_id, unit_id) != NULL) {
815 if (max_devs && unit_id >= max_devs) {
822 if (max_devs && unit_id >= max_devs) {
823 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
827 if (drive_get(type, bus_id, unit_id) != NULL) {
828 error_report("drive with bus=%d, unit=%d (index=%d) exists",
829 bus_id, unit_id, index);
833 /* no id supplied -> create one */
834 if (qemu_opts_id(all_opts) == NULL) {
836 const char *mediastr = "";
837 if (type == IF_IDE || type == IF_SCSI) {
838 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
841 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
844 new_id = g_strdup_printf("%s%s%i", if_name[type],
847 qdict_put(bs_opts, "id", qstring_from_str(new_id));
851 /* Add virtio block device */
852 devaddr = qemu_opt_get(legacy_opts, "addr");
853 if (devaddr && type != IF_VIRTIO) {
854 error_report("addr is not supported by this bus type");
858 if (type == IF_VIRTIO) {
860 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
862 if (arch_type == QEMU_ARCH_S390X) {
863 qemu_opt_set(devopts, "driver", "virtio-blk-s390");
865 qemu_opt_set(devopts, "driver", "virtio-blk-pci");
867 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"));
869 qemu_opt_set(devopts, "addr", devaddr);
873 filename = qemu_opt_get(legacy_opts, "file");
875 /* Actual block device init: Functionality shared with blockdev-add */
876 dinfo = blockdev_init(filename, bs_opts, type, &local_err);
878 if (error_is_set(&local_err)) {
879 qerror_report_err(local_err);
880 error_free(local_err);
884 assert(!error_is_set(&local_err));
887 /* Set legacy DriveInfo fields */
888 dinfo->enable_auto_del = true;
889 dinfo->opts = all_opts;
892 dinfo->heads = heads;
894 dinfo->trans = translation;
897 dinfo->unit = unit_id;
898 dinfo->devaddr = devaddr;
905 dinfo->media_cd = media == MEDIA_CDROM;
912 qemu_opts_del(legacy_opts);
916 void do_commit(Monitor *mon, const QDict *qdict)
918 const char *device = qdict_get_str(qdict, "device");
919 BlockDriverState *bs;
922 if (!strcmp(device, "all")) {
923 ret = bdrv_commit_all();
925 bs = bdrv_find(device);
927 monitor_printf(mon, "Device '%s' not found\n", device);
930 ret = bdrv_commit(bs);
933 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
938 static void blockdev_do_action(int kind, void *data, Error **errp)
940 TransactionAction action;
941 TransactionActionList list;
945 list.value = &action;
947 qmp_transaction(&list, errp);
950 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
951 bool has_format, const char *format,
952 bool has_mode, enum NewImageMode mode,
955 BlockdevSnapshot snapshot = {
956 .device = (char *) device,
957 .snapshot_file = (char *) snapshot_file,
958 .has_format = has_format,
959 .format = (char *) format,
960 .has_mode = has_mode,
963 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
967 void qmp_blockdev_snapshot_internal_sync(const char *device,
971 BlockdevSnapshotInternal snapshot = {
972 .device = (char *) device,
973 .name = (char *) name
976 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
980 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
987 BlockDriverState *bs = bdrv_find(device);
989 Error *local_err = NULL;
990 SnapshotInfo *info = NULL;
994 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1007 error_setg(errp, "Name or id must be provided");
1011 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1012 if (error_is_set(&local_err)) {
1013 error_propagate(errp, local_err);
1018 "Snapshot with id '%s' and name '%s' does not exist on "
1020 STR_OR_NULL(id), STR_OR_NULL(name), device);
1024 bdrv_snapshot_delete(bs, id, name, &local_err);
1025 if (error_is_set(&local_err)) {
1026 error_propagate(errp, local_err);
1030 info = g_malloc0(sizeof(SnapshotInfo));
1031 info->id = g_strdup(sn.id_str);
1032 info->name = g_strdup(sn.name);
1033 info->date_nsec = sn.date_nsec;
1034 info->date_sec = sn.date_sec;
1035 info->vm_state_size = sn.vm_state_size;
1036 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1037 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1042 /* New and old BlockDriverState structs for group snapshots */
1044 typedef struct BlkTransactionState BlkTransactionState;
1046 /* Only prepare() may fail. In a single transaction, only one of commit() or
1047 abort() will be called, clean() will always be called if it present. */
1048 typedef struct BdrvActionOps {
1049 /* Size of state struct, in bytes. */
1050 size_t instance_size;
1051 /* Prepare the work, must NOT be NULL. */
1052 void (*prepare)(BlkTransactionState *common, Error **errp);
1053 /* Commit the changes, can be NULL. */
1054 void (*commit)(BlkTransactionState *common);
1055 /* Abort the changes on fail, can be NULL. */
1056 void (*abort)(BlkTransactionState *common);
1057 /* Clean up resource in the end, can be NULL. */
1058 void (*clean)(BlkTransactionState *common);
1062 * This structure must be arranged as first member in child type, assuming
1063 * that compiler will also arrange it to the same address with parent instance.
1064 * Later it will be used in free().
1066 struct BlkTransactionState {
1067 TransactionAction *action;
1068 const BdrvActionOps *ops;
1069 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1072 /* internal snapshot private data */
1073 typedef struct InternalSnapshotState {
1074 BlkTransactionState common;
1075 BlockDriverState *bs;
1076 QEMUSnapshotInfo sn;
1077 } InternalSnapshotState;
1079 static void internal_snapshot_prepare(BlkTransactionState *common,
1084 BlockDriverState *bs;
1085 QEMUSnapshotInfo old_sn, *sn;
1088 BlockdevSnapshotInternal *internal;
1089 InternalSnapshotState *state;
1092 g_assert(common->action->kind ==
1093 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1094 internal = common->action->blockdev_snapshot_internal_sync;
1095 state = DO_UPCAST(InternalSnapshotState, common, common);
1097 /* 1. parse input */
1098 device = internal->device;
1099 name = internal->name;
1101 /* 2. check for validation */
1102 bs = bdrv_find(device);
1104 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1108 if (!bdrv_is_inserted(bs)) {
1109 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1113 if (bdrv_is_read_only(bs)) {
1114 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1118 if (!bdrv_can_snapshot(bs)) {
1119 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1120 bs->drv->format_name, device, "internal snapshot");
1124 if (!strlen(name)) {
1125 error_setg(errp, "Name is empty");
1129 /* check whether a snapshot with name exist */
1130 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp);
1131 if (error_is_set(errp)) {
1135 "Snapshot with name '%s' already exists on device '%s'",
1140 /* 3. take the snapshot */
1142 pstrcpy(sn->name, sizeof(sn->name), name);
1143 qemu_gettimeofday(&tv);
1144 sn->date_sec = tv.tv_sec;
1145 sn->date_nsec = tv.tv_usec * 1000;
1146 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1148 ret1 = bdrv_snapshot_create(bs, sn);
1150 error_setg_errno(errp, -ret1,
1151 "Failed to create snapshot '%s' on device '%s'",
1156 /* 4. succeed, mark a snapshot is created */
1160 static void internal_snapshot_abort(BlkTransactionState *common)
1162 InternalSnapshotState *state =
1163 DO_UPCAST(InternalSnapshotState, common, common);
1164 BlockDriverState *bs = state->bs;
1165 QEMUSnapshotInfo *sn = &state->sn;
1166 Error *local_error = NULL;
1172 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1173 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1174 "device '%s' in abort: %s",
1177 bdrv_get_device_name(bs),
1178 error_get_pretty(local_error));
1179 error_free(local_error);
1183 /* external snapshot private data */
1184 typedef struct ExternalSnapshotState {
1185 BlkTransactionState common;
1186 BlockDriverState *old_bs;
1187 BlockDriverState *new_bs;
1188 } ExternalSnapshotState;
1190 static void external_snapshot_prepare(BlkTransactionState *common,
1195 Error *local_err = NULL;
1197 const char *new_image_file;
1198 const char *format = "qcow2";
1199 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1200 ExternalSnapshotState *state =
1201 DO_UPCAST(ExternalSnapshotState, common, common);
1202 TransactionAction *action = common->action;
1204 /* get parameters */
1205 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1207 device = action->blockdev_snapshot_sync->device;
1208 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1209 if (action->blockdev_snapshot_sync->has_format) {
1210 format = action->blockdev_snapshot_sync->format;
1212 if (action->blockdev_snapshot_sync->has_mode) {
1213 mode = action->blockdev_snapshot_sync->mode;
1216 /* start processing */
1217 drv = bdrv_find_format(format);
1219 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1223 state->old_bs = bdrv_find(device);
1224 if (!state->old_bs) {
1225 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1229 if (!bdrv_is_inserted(state->old_bs)) {
1230 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1234 if (bdrv_in_use(state->old_bs)) {
1235 error_set(errp, QERR_DEVICE_IN_USE, device);
1239 if (!bdrv_is_read_only(state->old_bs)) {
1240 if (bdrv_flush(state->old_bs)) {
1241 error_set(errp, QERR_IO_ERROR);
1246 if (!bdrv_is_first_non_filter(state->old_bs)) {
1247 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1251 flags = state->old_bs->open_flags;
1253 /* create new image w/backing file */
1254 if (mode != NEW_IMAGE_MODE_EXISTING) {
1255 bdrv_img_create(new_image_file, format,
1256 state->old_bs->filename,
1257 state->old_bs->drv->format_name,
1258 NULL, -1, flags, &local_err, false);
1259 if (error_is_set(&local_err)) {
1260 error_propagate(errp, local_err);
1265 /* We will manually add the backing_hd field to the bs later */
1266 state->new_bs = bdrv_new("");
1267 /* TODO Inherit bs->options or only take explicit options with an
1268 * extended QMP command? */
1269 ret = bdrv_open(state->new_bs, new_image_file, NULL,
1270 flags | BDRV_O_NO_BACKING, drv, &local_err);
1272 error_propagate(errp, local_err);
1276 static void external_snapshot_commit(BlkTransactionState *common)
1278 ExternalSnapshotState *state =
1279 DO_UPCAST(ExternalSnapshotState, common, common);
1281 /* This removes our old bs and adds the new bs */
1282 bdrv_append(state->new_bs, state->old_bs);
1283 /* We don't need (or want) to use the transactional
1284 * bdrv_reopen_multiple() across all the entries at once, because we
1285 * don't want to abort all of them if one of them fails the reopen */
1286 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1290 static void external_snapshot_abort(BlkTransactionState *common)
1292 ExternalSnapshotState *state =
1293 DO_UPCAST(ExternalSnapshotState, common, common);
1294 if (state->new_bs) {
1295 bdrv_unref(state->new_bs);
1299 typedef struct DriveBackupState {
1300 BlkTransactionState common;
1301 BlockDriverState *bs;
1305 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1307 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1308 DriveBackup *backup;
1309 Error *local_err = NULL;
1311 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1312 backup = common->action->drive_backup;
1314 qmp_drive_backup(backup->device, backup->target,
1315 backup->has_format, backup->format,
1317 backup->has_mode, backup->mode,
1318 backup->has_speed, backup->speed,
1319 backup->has_on_source_error, backup->on_source_error,
1320 backup->has_on_target_error, backup->on_target_error,
1322 if (error_is_set(&local_err)) {
1323 error_propagate(errp, local_err);
1329 state->bs = bdrv_find(backup->device);
1330 state->job = state->bs->job;
1333 static void drive_backup_abort(BlkTransactionState *common)
1335 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1336 BlockDriverState *bs = state->bs;
1338 /* Only cancel if it's the job we started */
1339 if (bs && bs->job && bs->job == state->job) {
1340 block_job_cancel_sync(bs->job);
1344 static void abort_prepare(BlkTransactionState *common, Error **errp)
1346 error_setg(errp, "Transaction aborted using Abort action");
1349 static void abort_commit(BlkTransactionState *common)
1351 g_assert_not_reached(); /* this action never succeeds */
1354 static const BdrvActionOps actions[] = {
1355 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1356 .instance_size = sizeof(ExternalSnapshotState),
1357 .prepare = external_snapshot_prepare,
1358 .commit = external_snapshot_commit,
1359 .abort = external_snapshot_abort,
1361 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1362 .instance_size = sizeof(DriveBackupState),
1363 .prepare = drive_backup_prepare,
1364 .abort = drive_backup_abort,
1366 [TRANSACTION_ACTION_KIND_ABORT] = {
1367 .instance_size = sizeof(BlkTransactionState),
1368 .prepare = abort_prepare,
1369 .commit = abort_commit,
1371 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1372 .instance_size = sizeof(InternalSnapshotState),
1373 .prepare = internal_snapshot_prepare,
1374 .abort = internal_snapshot_abort,
1379 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
1380 * then we do not pivot any of the devices in the group, and abandon the
1383 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1385 TransactionActionList *dev_entry = dev_list;
1386 BlkTransactionState *state, *next;
1387 Error *local_err = NULL;
1389 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1390 QSIMPLEQ_INIT(&snap_bdrv_states);
1392 /* drain all i/o before any snapshots */
1395 /* We don't do anything in this loop that commits us to the snapshot */
1396 while (NULL != dev_entry) {
1397 TransactionAction *dev_info = NULL;
1398 const BdrvActionOps *ops;
1400 dev_info = dev_entry->value;
1401 dev_entry = dev_entry->next;
1403 assert(dev_info->kind < ARRAY_SIZE(actions));
1405 ops = &actions[dev_info->kind];
1406 assert(ops->instance_size > 0);
1408 state = g_malloc0(ops->instance_size);
1410 state->action = dev_info;
1411 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1413 state->ops->prepare(state, &local_err);
1414 if (error_is_set(&local_err)) {
1415 error_propagate(errp, local_err);
1416 goto delete_and_fail;
1420 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1421 if (state->ops->commit) {
1422 state->ops->commit(state);
1431 * failure, and it is all-or-none; abandon each new bs, and keep using
1432 * the original bs for all images
1434 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1435 if (state->ops->abort) {
1436 state->ops->abort(state);
1440 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1441 if (state->ops->clean) {
1442 state->ops->clean(state);
1449 static void eject_device(BlockDriverState *bs, int force, Error **errp)
1451 if (bdrv_in_use(bs)) {
1452 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
1455 if (!bdrv_dev_has_removable_media(bs)) {
1456 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
1460 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
1461 bdrv_dev_eject_request(bs, force);
1463 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
1471 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1473 BlockDriverState *bs;
1475 bs = bdrv_find(device);
1477 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1481 eject_device(bs, force, errp);
1484 void qmp_block_passwd(bool has_device, const char *device,
1485 bool has_node_name, const char *node_name,
1486 const char *password, Error **errp)
1488 Error *local_err = NULL;
1489 BlockDriverState *bs;
1492 bs = bdrv_lookup_bs(has_device ? device : NULL,
1493 has_node_name ? node_name : NULL,
1495 if (error_is_set(&local_err)) {
1496 error_propagate(errp, local_err);
1500 err = bdrv_set_key(bs, password);
1501 if (err == -EINVAL) {
1502 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1504 } else if (err < 0) {
1505 error_set(errp, QERR_INVALID_PASSWORD);
1510 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1511 int bdrv_flags, BlockDriver *drv,
1512 const char *password, Error **errp)
1514 Error *local_err = NULL;
1517 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err);
1519 error_propagate(errp, local_err);
1523 if (bdrv_key_required(bs)) {
1525 if (bdrv_set_key(bs, password) < 0) {
1526 error_set(errp, QERR_INVALID_PASSWORD);
1529 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1530 bdrv_get_encrypted_filename(bs));
1532 } else if (password) {
1533 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1537 void qmp_change_blockdev(const char *device, const char *filename,
1538 const char *format, Error **errp)
1540 BlockDriverState *bs;
1541 BlockDriver *drv = NULL;
1545 bs = bdrv_find(device);
1547 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1552 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1554 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1559 eject_device(bs, 0, &err);
1560 if (error_is_set(&err)) {
1561 error_propagate(errp, err);
1565 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1566 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1568 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1571 /* throttling disk I/O limits */
1572 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1579 bool has_bps_rd_max,
1581 bool has_bps_wr_max,
1585 bool has_iops_rd_max,
1586 int64_t iops_rd_max,
1587 bool has_iops_wr_max,
1588 int64_t iops_wr_max,
1590 int64_t iops_size, Error **errp)
1593 BlockDriverState *bs;
1595 bs = bdrv_find(device);
1597 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1601 memset(&cfg, 0, sizeof(cfg));
1602 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1603 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1604 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1606 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1607 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1608 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1611 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1613 if (has_bps_rd_max) {
1614 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1616 if (has_bps_wr_max) {
1617 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1620 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1622 if (has_iops_rd_max) {
1623 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1625 if (has_iops_wr_max) {
1626 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1629 if (has_iops_size) {
1630 cfg.op_size = iops_size;
1633 if (!check_throttle_config(&cfg, errp)) {
1637 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1638 bdrv_io_limits_enable(bs);
1639 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1640 bdrv_io_limits_disable(bs);
1643 if (bs->io_limits_enabled) {
1644 bdrv_set_io_limits(bs, &cfg);
1648 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1650 const char *id = qdict_get_str(qdict, "id");
1651 BlockDriverState *bs;
1655 qerror_report(QERR_DEVICE_NOT_FOUND, id);
1658 if (bdrv_in_use(bs)) {
1659 qerror_report(QERR_DEVICE_IN_USE, id);
1663 /* quiesce block driver; prevent further io */
1668 /* if we have a device attached to this BlockDriverState
1669 * then we need to make the drive anonymous until the device
1670 * can be removed. If this is a drive with no device backing
1671 * then we can just get rid of the block driver state right here.
1673 if (bdrv_get_attached_dev(bs)) {
1676 /* Further I/O must not pause the guest */
1677 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1678 BLOCKDEV_ON_ERROR_REPORT);
1680 drive_uninit(drive_get_by_blockdev(bs));
1686 void qmp_block_resize(const char *device, int64_t size, Error **errp)
1688 BlockDriverState *bs;
1691 bs = bdrv_find(device);
1693 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1698 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1702 /* complete all in-flight operations before resizing the device */
1705 ret = bdrv_truncate(bs, size);
1710 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1713 error_set(errp, QERR_UNSUPPORTED);
1716 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1719 error_set(errp, QERR_DEVICE_IN_USE, device);
1722 error_setg_errno(errp, -ret, "Could not resize");
1727 static void block_job_cb(void *opaque, int ret)
1729 BlockDriverState *bs = opaque;
1732 trace_block_job_cb(bs, bs->job, ret);
1735 obj = qobject_from_block_job(bs->job);
1737 QDict *dict = qobject_to_qdict(obj);
1738 qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1741 if (block_job_is_cancelled(bs->job)) {
1742 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1744 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1746 qobject_decref(obj);
1748 bdrv_put_ref_bh_schedule(bs);
1751 void qmp_block_stream(const char *device, bool has_base,
1752 const char *base, bool has_speed, int64_t speed,
1753 bool has_on_error, BlockdevOnError on_error,
1756 BlockDriverState *bs;
1757 BlockDriverState *base_bs = NULL;
1758 Error *local_err = NULL;
1760 if (!has_on_error) {
1761 on_error = BLOCKDEV_ON_ERROR_REPORT;
1764 bs = bdrv_find(device);
1766 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1771 base_bs = bdrv_find_backing_image(bs, base);
1772 if (base_bs == NULL) {
1773 error_set(errp, QERR_BASE_NOT_FOUND, base);
1778 stream_start(bs, base_bs, base, has_speed ? speed : 0,
1779 on_error, block_job_cb, bs, &local_err);
1780 if (error_is_set(&local_err)) {
1781 error_propagate(errp, local_err);
1785 trace_qmp_block_stream(bs, bs->job);
1788 void qmp_block_commit(const char *device,
1789 bool has_base, const char *base, const char *top,
1790 bool has_speed, int64_t speed,
1793 BlockDriverState *bs;
1794 BlockDriverState *base_bs, *top_bs;
1795 Error *local_err = NULL;
1796 /* This will be part of the QMP command, if/when the
1797 * BlockdevOnError change for blkmirror makes it in
1799 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1801 /* drain all i/o before commits */
1804 bs = bdrv_find(device);
1806 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1810 /* default top_bs is the active layer */
1814 if (strcmp(bs->filename, top) != 0) {
1815 top_bs = bdrv_find_backing_image(bs, top);
1819 if (top_bs == NULL) {
1820 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1824 if (has_base && base) {
1825 base_bs = bdrv_find_backing_image(top_bs, base);
1827 base_bs = bdrv_find_base(top_bs);
1830 if (base_bs == NULL) {
1831 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1836 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
1839 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1842 if (local_err != NULL) {
1843 error_propagate(errp, local_err);
1848 void qmp_drive_backup(const char *device, const char *target,
1849 bool has_format, const char *format,
1850 enum MirrorSyncMode sync,
1851 bool has_mode, enum NewImageMode mode,
1852 bool has_speed, int64_t speed,
1853 bool has_on_source_error, BlockdevOnError on_source_error,
1854 bool has_on_target_error, BlockdevOnError on_target_error,
1857 BlockDriverState *bs;
1858 BlockDriverState *target_bs;
1859 BlockDriverState *source = NULL;
1860 BlockDriver *drv = NULL;
1861 Error *local_err = NULL;
1869 if (!has_on_source_error) {
1870 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1872 if (!has_on_target_error) {
1873 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1876 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1879 bs = bdrv_find(device);
1881 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1885 if (!bdrv_is_inserted(bs)) {
1886 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1891 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1894 drv = bdrv_find_format(format);
1896 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1901 if (bdrv_in_use(bs)) {
1902 error_set(errp, QERR_DEVICE_IN_USE, device);
1906 flags = bs->open_flags | BDRV_O_RDWR;
1908 /* See if we have a backing HD we can use to create our new image
1910 if (sync == MIRROR_SYNC_MODE_TOP) {
1911 source = bs->backing_hd;
1913 sync = MIRROR_SYNC_MODE_FULL;
1916 if (sync == MIRROR_SYNC_MODE_NONE) {
1920 size = bdrv_getlength(bs);
1922 error_setg_errno(errp, -size, "bdrv_getlength failed");
1926 if (mode != NEW_IMAGE_MODE_EXISTING) {
1927 assert(format && drv);
1929 bdrv_img_create(target, format, source->filename,
1930 source->drv->format_name, NULL,
1931 size, flags, &local_err, false);
1933 bdrv_img_create(target, format, NULL, NULL, NULL,
1934 size, flags, &local_err, false);
1938 if (error_is_set(&local_err)) {
1939 error_propagate(errp, local_err);
1943 target_bs = bdrv_new("");
1944 ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err);
1946 bdrv_unref(target_bs);
1947 error_propagate(errp, local_err);
1951 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1952 block_job_cb, bs, &local_err);
1953 if (local_err != NULL) {
1954 bdrv_unref(target_bs);
1955 error_propagate(errp, local_err);
1960 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
1962 return bdrv_named_nodes_list();
1965 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
1967 void qmp_drive_mirror(const char *device, const char *target,
1968 bool has_format, const char *format,
1969 enum MirrorSyncMode sync,
1970 bool has_mode, enum NewImageMode mode,
1971 bool has_speed, int64_t speed,
1972 bool has_granularity, uint32_t granularity,
1973 bool has_buf_size, int64_t buf_size,
1974 bool has_on_source_error, BlockdevOnError on_source_error,
1975 bool has_on_target_error, BlockdevOnError on_target_error,
1978 BlockDriverState *bs;
1979 BlockDriverState *source, *target_bs;
1980 BlockDriver *drv = NULL;
1981 Error *local_err = NULL;
1989 if (!has_on_source_error) {
1990 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1992 if (!has_on_target_error) {
1993 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1996 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1998 if (!has_granularity) {
2001 if (!has_buf_size) {
2002 buf_size = DEFAULT_MIRROR_BUF_SIZE;
2005 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2006 error_set(errp, QERR_INVALID_PARAMETER, device);
2009 if (granularity & (granularity - 1)) {
2010 error_set(errp, QERR_INVALID_PARAMETER, device);
2014 bs = bdrv_find(device);
2016 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2020 if (!bdrv_is_inserted(bs)) {
2021 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2026 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2029 drv = bdrv_find_format(format);
2031 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2036 if (bdrv_in_use(bs)) {
2037 error_set(errp, QERR_DEVICE_IN_USE, device);
2041 flags = bs->open_flags | BDRV_O_RDWR;
2042 source = bs->backing_hd;
2043 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2044 sync = MIRROR_SYNC_MODE_FULL;
2046 if (sync == MIRROR_SYNC_MODE_NONE) {
2050 size = bdrv_getlength(bs);
2052 error_setg_errno(errp, -size, "bdrv_getlength failed");
2056 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2057 && mode != NEW_IMAGE_MODE_EXISTING)
2059 /* create new image w/o backing file */
2060 assert(format && drv);
2061 bdrv_img_create(target, format,
2062 NULL, NULL, NULL, size, flags, &local_err, false);
2065 case NEW_IMAGE_MODE_EXISTING:
2067 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2068 /* create new image with backing file */
2069 bdrv_img_create(target, format,
2071 source->drv->format_name,
2072 NULL, size, flags, &local_err, false);
2079 if (error_is_set(&local_err)) {
2080 error_propagate(errp, local_err);
2084 /* Mirroring takes care of copy-on-write using the source's backing
2087 target_bs = bdrv_new("");
2088 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
2091 bdrv_unref(target_bs);
2092 error_propagate(errp, local_err);
2096 mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
2097 on_source_error, on_target_error,
2098 block_job_cb, bs, &local_err);
2099 if (local_err != NULL) {
2100 bdrv_unref(target_bs);
2101 error_propagate(errp, local_err);
2106 static BlockJob *find_block_job(const char *device)
2108 BlockDriverState *bs;
2110 bs = bdrv_find(device);
2111 if (!bs || !bs->job) {
2117 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2119 BlockJob *job = find_block_job(device);
2122 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2126 block_job_set_speed(job, speed, errp);
2129 void qmp_block_job_cancel(const char *device,
2130 bool has_force, bool force, Error **errp)
2132 BlockJob *job = find_block_job(device);
2139 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2142 if (job->paused && !force) {
2143 error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
2147 trace_qmp_block_job_cancel(job);
2148 block_job_cancel(job);
2151 void qmp_block_job_pause(const char *device, Error **errp)
2153 BlockJob *job = find_block_job(device);
2156 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2160 trace_qmp_block_job_pause(job);
2161 block_job_pause(job);
2164 void qmp_block_job_resume(const char *device, Error **errp)
2166 BlockJob *job = find_block_job(device);
2169 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2173 trace_qmp_block_job_resume(job);
2174 block_job_resume(job);
2177 void qmp_block_job_complete(const char *device, Error **errp)
2179 BlockJob *job = find_block_job(device);
2182 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2186 trace_qmp_block_job_complete(job);
2187 block_job_complete(job, errp);
2190 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2192 QmpOutputVisitor *ov = qmp_output_visitor_new();
2195 Error *local_err = NULL;
2197 /* Require an ID in the top level */
2198 if (!options->has_id) {
2199 error_setg(errp, "Block device needs an ID");
2203 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with
2204 * cache.direct=false instead of silently switching to aio=threads, except
2205 * if called from drive_init.
2207 * For now, simply forbidding the combination for all drivers will do. */
2208 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2209 bool direct = options->cache->has_direct && options->cache->direct;
2210 if (!options->has_cache && !direct) {
2211 error_setg(errp, "aio=native requires cache.direct=true");
2216 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2217 &options, NULL, &local_err);
2218 if (error_is_set(&local_err)) {
2219 error_propagate(errp, local_err);
2223 obj = qmp_output_get_qobject(ov);
2224 qdict = qobject_to_qdict(obj);
2226 qdict_flatten(qdict);
2228 blockdev_init(NULL, qdict, IF_NONE, &local_err);
2229 if (error_is_set(&local_err)) {
2230 error_propagate(errp, local_err);
2235 qmp_output_visitor_cleanup(ov);
2238 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
2240 BlockJobInfoList **prev = opaque;
2241 BlockJob *job = bs->job;
2244 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2245 elem->value = block_job_query(bs->job);
2246 (*prev)->next = elem;
2251 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2253 /* Dummy is a fake list element for holding the head pointer */
2254 BlockJobInfoList dummy = {};
2255 BlockJobInfoList *prev = &dummy;
2256 bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
2260 QemuOptsList qemu_common_drive_opts = {
2262 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2266 .type = QEMU_OPT_BOOL,
2267 .help = "enable/disable snapshot mode",
2270 .type = QEMU_OPT_STRING,
2271 .help = "discard operation (ignore/off, unmap/on)",
2273 .name = "cache.writeback",
2274 .type = QEMU_OPT_BOOL,
2275 .help = "enables writeback mode for any caches",
2277 .name = "cache.direct",
2278 .type = QEMU_OPT_BOOL,
2279 .help = "enables use of O_DIRECT (bypass the host page cache)",
2281 .name = "cache.no-flush",
2282 .type = QEMU_OPT_BOOL,
2283 .help = "ignore any flush requests for the device",
2286 .type = QEMU_OPT_STRING,
2287 .help = "host AIO implementation (threads, native)",
2290 .type = QEMU_OPT_STRING,
2291 .help = "disk format (raw, qcow2, ...)",
2294 .type = QEMU_OPT_STRING,
2295 .help = "disk serial number",
2298 .type = QEMU_OPT_STRING,
2299 .help = "read error action",
2302 .type = QEMU_OPT_STRING,
2303 .help = "write error action",
2305 .name = "read-only",
2306 .type = QEMU_OPT_BOOL,
2307 .help = "open drive file as read-only",
2309 .name = "throttling.iops-total",
2310 .type = QEMU_OPT_NUMBER,
2311 .help = "limit total I/O operations per second",
2313 .name = "throttling.iops-read",
2314 .type = QEMU_OPT_NUMBER,
2315 .help = "limit read operations per second",
2317 .name = "throttling.iops-write",
2318 .type = QEMU_OPT_NUMBER,
2319 .help = "limit write operations per second",
2321 .name = "throttling.bps-total",
2322 .type = QEMU_OPT_NUMBER,
2323 .help = "limit total bytes per second",
2325 .name = "throttling.bps-read",
2326 .type = QEMU_OPT_NUMBER,
2327 .help = "limit read bytes per second",
2329 .name = "throttling.bps-write",
2330 .type = QEMU_OPT_NUMBER,
2331 .help = "limit write bytes per second",
2333 .name = "throttling.iops-total-max",
2334 .type = QEMU_OPT_NUMBER,
2335 .help = "I/O operations burst",
2337 .name = "throttling.iops-read-max",
2338 .type = QEMU_OPT_NUMBER,
2339 .help = "I/O operations read burst",
2341 .name = "throttling.iops-write-max",
2342 .type = QEMU_OPT_NUMBER,
2343 .help = "I/O operations write burst",
2345 .name = "throttling.bps-total-max",
2346 .type = QEMU_OPT_NUMBER,
2347 .help = "total bytes burst",
2349 .name = "throttling.bps-read-max",
2350 .type = QEMU_OPT_NUMBER,
2351 .help = "total bytes read burst",
2353 .name = "throttling.bps-write-max",
2354 .type = QEMU_OPT_NUMBER,
2355 .help = "total bytes write burst",
2357 .name = "throttling.iops-size",
2358 .type = QEMU_OPT_NUMBER,
2359 .help = "when limiting by iops max size of an I/O in bytes",
2361 .name = "copy-on-read",
2362 .type = QEMU_OPT_BOOL,
2363 .help = "copy read data from backing file into image file",
2365 { /* end of list */ }
2369 QemuOptsList qemu_drive_opts = {
2371 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2374 * no elements => accept any params
2375 * validation will happen later
2377 { /* end of list */ }