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(bool has_device, const char *device,
951 bool has_node_name, const char *node_name,
952 const char *snapshot_file,
953 bool has_snapshot_node_name,
954 const char *snapshot_node_name,
955 bool has_format, const char *format,
956 bool has_mode, NewImageMode mode, Error **errp)
958 BlockdevSnapshot snapshot = {
959 .has_device = has_device,
960 .device = (char *) device,
961 .has_node_name = has_node_name,
962 .node_name = (char *) node_name,
963 .snapshot_file = (char *) snapshot_file,
964 .has_snapshot_node_name = has_snapshot_node_name,
965 .snapshot_node_name = (char *) snapshot_node_name,
966 .has_format = has_format,
967 .format = (char *) format,
968 .has_mode = has_mode,
971 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
975 void qmp_blockdev_snapshot_internal_sync(const char *device,
979 BlockdevSnapshotInternal snapshot = {
980 .device = (char *) device,
981 .name = (char *) name
984 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
988 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
995 BlockDriverState *bs = bdrv_find(device);
997 Error *local_err = NULL;
998 SnapshotInfo *info = NULL;
1002 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1015 error_setg(errp, "Name or id must be provided");
1019 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1020 if (error_is_set(&local_err)) {
1021 error_propagate(errp, local_err);
1026 "Snapshot with id '%s' and name '%s' does not exist on "
1028 STR_OR_NULL(id), STR_OR_NULL(name), device);
1032 bdrv_snapshot_delete(bs, id, name, &local_err);
1033 if (error_is_set(&local_err)) {
1034 error_propagate(errp, local_err);
1038 info = g_malloc0(sizeof(SnapshotInfo));
1039 info->id = g_strdup(sn.id_str);
1040 info->name = g_strdup(sn.name);
1041 info->date_nsec = sn.date_nsec;
1042 info->date_sec = sn.date_sec;
1043 info->vm_state_size = sn.vm_state_size;
1044 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1045 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1050 /* New and old BlockDriverState structs for group snapshots */
1052 typedef struct BlkTransactionState BlkTransactionState;
1054 /* Only prepare() may fail. In a single transaction, only one of commit() or
1055 abort() will be called, clean() will always be called if it present. */
1056 typedef struct BdrvActionOps {
1057 /* Size of state struct, in bytes. */
1058 size_t instance_size;
1059 /* Prepare the work, must NOT be NULL. */
1060 void (*prepare)(BlkTransactionState *common, Error **errp);
1061 /* Commit the changes, can be NULL. */
1062 void (*commit)(BlkTransactionState *common);
1063 /* Abort the changes on fail, can be NULL. */
1064 void (*abort)(BlkTransactionState *common);
1065 /* Clean up resource in the end, can be NULL. */
1066 void (*clean)(BlkTransactionState *common);
1070 * This structure must be arranged as first member in child type, assuming
1071 * that compiler will also arrange it to the same address with parent instance.
1072 * Later it will be used in free().
1074 struct BlkTransactionState {
1075 TransactionAction *action;
1076 const BdrvActionOps *ops;
1077 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1080 /* internal snapshot private data */
1081 typedef struct InternalSnapshotState {
1082 BlkTransactionState common;
1083 BlockDriverState *bs;
1084 QEMUSnapshotInfo sn;
1085 } InternalSnapshotState;
1087 static void internal_snapshot_prepare(BlkTransactionState *common,
1092 BlockDriverState *bs;
1093 QEMUSnapshotInfo old_sn, *sn;
1096 BlockdevSnapshotInternal *internal;
1097 InternalSnapshotState *state;
1100 g_assert(common->action->kind ==
1101 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1102 internal = common->action->blockdev_snapshot_internal_sync;
1103 state = DO_UPCAST(InternalSnapshotState, common, common);
1105 /* 1. parse input */
1106 device = internal->device;
1107 name = internal->name;
1109 /* 2. check for validation */
1110 bs = bdrv_find(device);
1112 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1116 if (!bdrv_is_inserted(bs)) {
1117 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1121 if (bdrv_is_read_only(bs)) {
1122 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1126 if (!bdrv_can_snapshot(bs)) {
1127 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
1128 bs->drv->format_name, device, "internal snapshot");
1132 if (!strlen(name)) {
1133 error_setg(errp, "Name is empty");
1137 /* check whether a snapshot with name exist */
1138 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp);
1139 if (error_is_set(errp)) {
1143 "Snapshot with name '%s' already exists on device '%s'",
1148 /* 3. take the snapshot */
1150 pstrcpy(sn->name, sizeof(sn->name), name);
1151 qemu_gettimeofday(&tv);
1152 sn->date_sec = tv.tv_sec;
1153 sn->date_nsec = tv.tv_usec * 1000;
1154 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1156 ret1 = bdrv_snapshot_create(bs, sn);
1158 error_setg_errno(errp, -ret1,
1159 "Failed to create snapshot '%s' on device '%s'",
1164 /* 4. succeed, mark a snapshot is created */
1168 static void internal_snapshot_abort(BlkTransactionState *common)
1170 InternalSnapshotState *state =
1171 DO_UPCAST(InternalSnapshotState, common, common);
1172 BlockDriverState *bs = state->bs;
1173 QEMUSnapshotInfo *sn = &state->sn;
1174 Error *local_error = NULL;
1180 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1181 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1182 "device '%s' in abort: %s",
1185 bdrv_get_device_name(bs),
1186 error_get_pretty(local_error));
1187 error_free(local_error);
1191 /* external snapshot private data */
1192 typedef struct ExternalSnapshotState {
1193 BlkTransactionState common;
1194 BlockDriverState *old_bs;
1195 BlockDriverState *new_bs;
1196 } ExternalSnapshotState;
1198 static void external_snapshot_prepare(BlkTransactionState *common,
1203 QDict *options = NULL;
1204 Error *local_err = NULL;
1205 bool has_device = false;
1207 bool has_node_name = false;
1208 const char *node_name;
1209 bool has_snapshot_node_name = false;
1210 const char *snapshot_node_name;
1211 const char *new_image_file;
1212 const char *format = "qcow2";
1213 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1214 ExternalSnapshotState *state =
1215 DO_UPCAST(ExternalSnapshotState, common, common);
1216 TransactionAction *action = common->action;
1218 /* get parameters */
1219 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1221 has_device = action->blockdev_snapshot_sync->has_device;
1222 device = action->blockdev_snapshot_sync->device;
1223 has_node_name = action->blockdev_snapshot_sync->has_node_name;
1224 node_name = action->blockdev_snapshot_sync->node_name;
1225 has_snapshot_node_name =
1226 action->blockdev_snapshot_sync->has_snapshot_node_name;
1227 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
1229 new_image_file = action->blockdev_snapshot_sync->snapshot_file;
1230 if (action->blockdev_snapshot_sync->has_format) {
1231 format = action->blockdev_snapshot_sync->format;
1233 if (action->blockdev_snapshot_sync->has_mode) {
1234 mode = action->blockdev_snapshot_sync->mode;
1237 /* start processing */
1238 drv = bdrv_find_format(format);
1240 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1244 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1245 has_node_name ? node_name : NULL,
1247 if (error_is_set(&local_err)) {
1248 error_propagate(errp, local_err);
1252 if (has_node_name && !has_snapshot_node_name) {
1253 error_setg(errp, "New snapshot node name missing");
1257 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1258 error_setg(errp, "New snapshot node name already existing");
1262 if (!bdrv_is_inserted(state->old_bs)) {
1263 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1267 if (bdrv_in_use(state->old_bs)) {
1268 error_set(errp, QERR_DEVICE_IN_USE, device);
1272 if (!bdrv_is_read_only(state->old_bs)) {
1273 if (bdrv_flush(state->old_bs)) {
1274 error_set(errp, QERR_IO_ERROR);
1279 if (!bdrv_is_first_non_filter(state->old_bs)) {
1280 error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
1284 flags = state->old_bs->open_flags;
1286 /* create new image w/backing file */
1287 if (mode != NEW_IMAGE_MODE_EXISTING) {
1288 bdrv_img_create(new_image_file, format,
1289 state->old_bs->filename,
1290 state->old_bs->drv->format_name,
1291 NULL, -1, flags, &local_err, false);
1292 if (error_is_set(&local_err)) {
1293 error_propagate(errp, local_err);
1298 if (has_snapshot_node_name) {
1299 options = qdict_new();
1300 qdict_put(options, "node-name",
1301 qstring_from_str(snapshot_node_name));
1304 /* We will manually add the backing_hd field to the bs later */
1305 state->new_bs = bdrv_new("");
1306 /* TODO Inherit bs->options or only take explicit options with an
1307 * extended QMP command? */
1308 ret = bdrv_open(state->new_bs, new_image_file, options,
1309 flags | BDRV_O_NO_BACKING, drv, &local_err);
1311 error_propagate(errp, local_err);
1317 static void external_snapshot_commit(BlkTransactionState *common)
1319 ExternalSnapshotState *state =
1320 DO_UPCAST(ExternalSnapshotState, common, common);
1322 /* This removes our old bs and adds the new bs */
1323 bdrv_append(state->new_bs, state->old_bs);
1324 /* We don't need (or want) to use the transactional
1325 * bdrv_reopen_multiple() across all the entries at once, because we
1326 * don't want to abort all of them if one of them fails the reopen */
1327 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1331 static void external_snapshot_abort(BlkTransactionState *common)
1333 ExternalSnapshotState *state =
1334 DO_UPCAST(ExternalSnapshotState, common, common);
1335 if (state->new_bs) {
1336 bdrv_unref(state->new_bs);
1340 typedef struct DriveBackupState {
1341 BlkTransactionState common;
1342 BlockDriverState *bs;
1346 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1348 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1349 DriveBackup *backup;
1350 Error *local_err = NULL;
1352 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1353 backup = common->action->drive_backup;
1355 qmp_drive_backup(backup->device, backup->target,
1356 backup->has_format, backup->format,
1358 backup->has_mode, backup->mode,
1359 backup->has_speed, backup->speed,
1360 backup->has_on_source_error, backup->on_source_error,
1361 backup->has_on_target_error, backup->on_target_error,
1363 if (error_is_set(&local_err)) {
1364 error_propagate(errp, local_err);
1370 state->bs = bdrv_find(backup->device);
1371 state->job = state->bs->job;
1374 static void drive_backup_abort(BlkTransactionState *common)
1376 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1377 BlockDriverState *bs = state->bs;
1379 /* Only cancel if it's the job we started */
1380 if (bs && bs->job && bs->job == state->job) {
1381 block_job_cancel_sync(bs->job);
1385 static void abort_prepare(BlkTransactionState *common, Error **errp)
1387 error_setg(errp, "Transaction aborted using Abort action");
1390 static void abort_commit(BlkTransactionState *common)
1392 g_assert_not_reached(); /* this action never succeeds */
1395 static const BdrvActionOps actions[] = {
1396 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1397 .instance_size = sizeof(ExternalSnapshotState),
1398 .prepare = external_snapshot_prepare,
1399 .commit = external_snapshot_commit,
1400 .abort = external_snapshot_abort,
1402 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1403 .instance_size = sizeof(DriveBackupState),
1404 .prepare = drive_backup_prepare,
1405 .abort = drive_backup_abort,
1407 [TRANSACTION_ACTION_KIND_ABORT] = {
1408 .instance_size = sizeof(BlkTransactionState),
1409 .prepare = abort_prepare,
1410 .commit = abort_commit,
1412 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1413 .instance_size = sizeof(InternalSnapshotState),
1414 .prepare = internal_snapshot_prepare,
1415 .abort = internal_snapshot_abort,
1420 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
1421 * then we do not pivot any of the devices in the group, and abandon the
1424 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1426 TransactionActionList *dev_entry = dev_list;
1427 BlkTransactionState *state, *next;
1428 Error *local_err = NULL;
1430 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1431 QSIMPLEQ_INIT(&snap_bdrv_states);
1433 /* drain all i/o before any snapshots */
1436 /* We don't do anything in this loop that commits us to the snapshot */
1437 while (NULL != dev_entry) {
1438 TransactionAction *dev_info = NULL;
1439 const BdrvActionOps *ops;
1441 dev_info = dev_entry->value;
1442 dev_entry = dev_entry->next;
1444 assert(dev_info->kind < ARRAY_SIZE(actions));
1446 ops = &actions[dev_info->kind];
1447 assert(ops->instance_size > 0);
1449 state = g_malloc0(ops->instance_size);
1451 state->action = dev_info;
1452 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1454 state->ops->prepare(state, &local_err);
1455 if (error_is_set(&local_err)) {
1456 error_propagate(errp, local_err);
1457 goto delete_and_fail;
1461 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1462 if (state->ops->commit) {
1463 state->ops->commit(state);
1472 * failure, and it is all-or-none; abandon each new bs, and keep using
1473 * the original bs for all images
1475 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1476 if (state->ops->abort) {
1477 state->ops->abort(state);
1481 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1482 if (state->ops->clean) {
1483 state->ops->clean(state);
1490 static void eject_device(BlockDriverState *bs, int force, Error **errp)
1492 if (bdrv_in_use(bs)) {
1493 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
1496 if (!bdrv_dev_has_removable_media(bs)) {
1497 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
1501 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
1502 bdrv_dev_eject_request(bs, force);
1504 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
1512 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1514 BlockDriverState *bs;
1516 bs = bdrv_find(device);
1518 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1522 eject_device(bs, force, errp);
1525 void qmp_block_passwd(bool has_device, const char *device,
1526 bool has_node_name, const char *node_name,
1527 const char *password, Error **errp)
1529 Error *local_err = NULL;
1530 BlockDriverState *bs;
1533 bs = bdrv_lookup_bs(has_device ? device : NULL,
1534 has_node_name ? node_name : NULL,
1536 if (error_is_set(&local_err)) {
1537 error_propagate(errp, local_err);
1541 err = bdrv_set_key(bs, password);
1542 if (err == -EINVAL) {
1543 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1545 } else if (err < 0) {
1546 error_set(errp, QERR_INVALID_PASSWORD);
1551 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
1552 int bdrv_flags, BlockDriver *drv,
1553 const char *password, Error **errp)
1555 Error *local_err = NULL;
1558 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err);
1560 error_propagate(errp, local_err);
1564 if (bdrv_key_required(bs)) {
1566 if (bdrv_set_key(bs, password) < 0) {
1567 error_set(errp, QERR_INVALID_PASSWORD);
1570 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
1571 bdrv_get_encrypted_filename(bs));
1573 } else if (password) {
1574 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1578 void qmp_change_blockdev(const char *device, const char *filename,
1579 const char *format, Error **errp)
1581 BlockDriverState *bs;
1582 BlockDriver *drv = NULL;
1586 bs = bdrv_find(device);
1588 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1593 drv = bdrv_find_whitelisted_format(format, bs->read_only);
1595 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1600 eject_device(bs, 0, &err);
1601 if (error_is_set(&err)) {
1602 error_propagate(errp, err);
1606 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1607 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
1609 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1612 /* throttling disk I/O limits */
1613 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1620 bool has_bps_rd_max,
1622 bool has_bps_wr_max,
1626 bool has_iops_rd_max,
1627 int64_t iops_rd_max,
1628 bool has_iops_wr_max,
1629 int64_t iops_wr_max,
1631 int64_t iops_size, Error **errp)
1634 BlockDriverState *bs;
1636 bs = bdrv_find(device);
1638 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1642 memset(&cfg, 0, sizeof(cfg));
1643 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
1644 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
1645 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
1647 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
1648 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
1649 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
1652 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
1654 if (has_bps_rd_max) {
1655 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
1657 if (has_bps_wr_max) {
1658 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
1661 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
1663 if (has_iops_rd_max) {
1664 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
1666 if (has_iops_wr_max) {
1667 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
1670 if (has_iops_size) {
1671 cfg.op_size = iops_size;
1674 if (!check_throttle_config(&cfg, errp)) {
1678 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
1679 bdrv_io_limits_enable(bs);
1680 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
1681 bdrv_io_limits_disable(bs);
1684 if (bs->io_limits_enabled) {
1685 bdrv_set_io_limits(bs, &cfg);
1689 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1691 const char *id = qdict_get_str(qdict, "id");
1692 BlockDriverState *bs;
1696 qerror_report(QERR_DEVICE_NOT_FOUND, id);
1699 if (bdrv_in_use(bs)) {
1700 qerror_report(QERR_DEVICE_IN_USE, id);
1704 /* quiesce block driver; prevent further io */
1709 /* if we have a device attached to this BlockDriverState
1710 * then we need to make the drive anonymous until the device
1711 * can be removed. If this is a drive with no device backing
1712 * then we can just get rid of the block driver state right here.
1714 if (bdrv_get_attached_dev(bs)) {
1717 /* Further I/O must not pause the guest */
1718 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
1719 BLOCKDEV_ON_ERROR_REPORT);
1721 drive_uninit(drive_get_by_blockdev(bs));
1727 void qmp_block_resize(bool has_device, const char *device,
1728 bool has_node_name, const char *node_name,
1729 int64_t size, Error **errp)
1731 Error *local_err = NULL;
1732 BlockDriverState *bs;
1735 bs = bdrv_lookup_bs(has_device ? device : NULL,
1736 has_node_name ? node_name : NULL,
1738 if (error_is_set(&local_err)) {
1739 error_propagate(errp, local_err);
1743 if (!bdrv_is_first_non_filter(bs)) {
1744 error_set(errp, QERR_FEATURE_DISABLED, "resize");
1749 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
1753 /* complete all in-flight operations before resizing the device */
1756 ret = bdrv_truncate(bs, size);
1761 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1764 error_set(errp, QERR_UNSUPPORTED);
1767 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
1770 error_set(errp, QERR_DEVICE_IN_USE, device);
1773 error_setg_errno(errp, -ret, "Could not resize");
1778 static void block_job_cb(void *opaque, int ret)
1780 BlockDriverState *bs = opaque;
1783 trace_block_job_cb(bs, bs->job, ret);
1786 obj = qobject_from_block_job(bs->job);
1788 QDict *dict = qobject_to_qdict(obj);
1789 qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
1792 if (block_job_is_cancelled(bs->job)) {
1793 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
1795 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
1797 qobject_decref(obj);
1799 bdrv_put_ref_bh_schedule(bs);
1802 void qmp_block_stream(const char *device, bool has_base,
1803 const char *base, bool has_speed, int64_t speed,
1804 bool has_on_error, BlockdevOnError on_error,
1807 BlockDriverState *bs;
1808 BlockDriverState *base_bs = NULL;
1809 Error *local_err = NULL;
1811 if (!has_on_error) {
1812 on_error = BLOCKDEV_ON_ERROR_REPORT;
1815 bs = bdrv_find(device);
1817 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1822 base_bs = bdrv_find_backing_image(bs, base);
1823 if (base_bs == NULL) {
1824 error_set(errp, QERR_BASE_NOT_FOUND, base);
1829 stream_start(bs, base_bs, base, has_speed ? speed : 0,
1830 on_error, block_job_cb, bs, &local_err);
1831 if (error_is_set(&local_err)) {
1832 error_propagate(errp, local_err);
1836 trace_qmp_block_stream(bs, bs->job);
1839 void qmp_block_commit(const char *device,
1840 bool has_base, const char *base, const char *top,
1841 bool has_speed, int64_t speed,
1844 BlockDriverState *bs;
1845 BlockDriverState *base_bs, *top_bs;
1846 Error *local_err = NULL;
1847 /* This will be part of the QMP command, if/when the
1848 * BlockdevOnError change for blkmirror makes it in
1850 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1852 /* drain all i/o before commits */
1855 bs = bdrv_find(device);
1857 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1861 /* default top_bs is the active layer */
1865 if (strcmp(bs->filename, top) != 0) {
1866 top_bs = bdrv_find_backing_image(bs, top);
1870 if (top_bs == NULL) {
1871 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
1875 if (has_base && base) {
1876 base_bs = bdrv_find_backing_image(top_bs, base);
1878 base_bs = bdrv_find_base(top_bs);
1881 if (base_bs == NULL) {
1882 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
1887 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
1890 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
1893 if (local_err != NULL) {
1894 error_propagate(errp, local_err);
1899 void qmp_drive_backup(const char *device, const char *target,
1900 bool has_format, const char *format,
1901 enum MirrorSyncMode sync,
1902 bool has_mode, enum NewImageMode mode,
1903 bool has_speed, int64_t speed,
1904 bool has_on_source_error, BlockdevOnError on_source_error,
1905 bool has_on_target_error, BlockdevOnError on_target_error,
1908 BlockDriverState *bs;
1909 BlockDriverState *target_bs;
1910 BlockDriverState *source = NULL;
1911 BlockDriver *drv = NULL;
1912 Error *local_err = NULL;
1920 if (!has_on_source_error) {
1921 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
1923 if (!has_on_target_error) {
1924 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
1927 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1930 bs = bdrv_find(device);
1932 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
1936 if (!bdrv_is_inserted(bs)) {
1937 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1942 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
1945 drv = bdrv_find_format(format);
1947 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1952 if (bdrv_in_use(bs)) {
1953 error_set(errp, QERR_DEVICE_IN_USE, device);
1957 flags = bs->open_flags | BDRV_O_RDWR;
1959 /* See if we have a backing HD we can use to create our new image
1961 if (sync == MIRROR_SYNC_MODE_TOP) {
1962 source = bs->backing_hd;
1964 sync = MIRROR_SYNC_MODE_FULL;
1967 if (sync == MIRROR_SYNC_MODE_NONE) {
1971 size = bdrv_getlength(bs);
1973 error_setg_errno(errp, -size, "bdrv_getlength failed");
1977 if (mode != NEW_IMAGE_MODE_EXISTING) {
1978 assert(format && drv);
1980 bdrv_img_create(target, format, source->filename,
1981 source->drv->format_name, NULL,
1982 size, flags, &local_err, false);
1984 bdrv_img_create(target, format, NULL, NULL, NULL,
1985 size, flags, &local_err, false);
1989 if (error_is_set(&local_err)) {
1990 error_propagate(errp, local_err);
1994 target_bs = bdrv_new("");
1995 ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err);
1997 bdrv_unref(target_bs);
1998 error_propagate(errp, local_err);
2002 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
2003 block_job_cb, bs, &local_err);
2004 if (local_err != NULL) {
2005 bdrv_unref(target_bs);
2006 error_propagate(errp, local_err);
2011 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2013 return bdrv_named_nodes_list();
2016 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
2018 void qmp_drive_mirror(const char *device, const char *target,
2019 bool has_format, const char *format,
2020 enum MirrorSyncMode sync,
2021 bool has_mode, enum NewImageMode mode,
2022 bool has_speed, int64_t speed,
2023 bool has_granularity, uint32_t granularity,
2024 bool has_buf_size, int64_t buf_size,
2025 bool has_on_source_error, BlockdevOnError on_source_error,
2026 bool has_on_target_error, BlockdevOnError on_target_error,
2029 BlockDriverState *bs;
2030 BlockDriverState *source, *target_bs;
2031 BlockDriver *drv = NULL;
2032 Error *local_err = NULL;
2040 if (!has_on_source_error) {
2041 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2043 if (!has_on_target_error) {
2044 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2047 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2049 if (!has_granularity) {
2052 if (!has_buf_size) {
2053 buf_size = DEFAULT_MIRROR_BUF_SIZE;
2056 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2057 error_set(errp, QERR_INVALID_PARAMETER, device);
2060 if (granularity & (granularity - 1)) {
2061 error_set(errp, QERR_INVALID_PARAMETER, device);
2065 bs = bdrv_find(device);
2067 error_set(errp, QERR_DEVICE_NOT_FOUND, device);
2071 if (!bdrv_is_inserted(bs)) {
2072 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2077 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2080 drv = bdrv_find_format(format);
2082 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2087 if (bdrv_in_use(bs)) {
2088 error_set(errp, QERR_DEVICE_IN_USE, device);
2092 flags = bs->open_flags | BDRV_O_RDWR;
2093 source = bs->backing_hd;
2094 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
2095 sync = MIRROR_SYNC_MODE_FULL;
2097 if (sync == MIRROR_SYNC_MODE_NONE) {
2101 size = bdrv_getlength(bs);
2103 error_setg_errno(errp, -size, "bdrv_getlength failed");
2107 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
2108 && mode != NEW_IMAGE_MODE_EXISTING)
2110 /* create new image w/o backing file */
2111 assert(format && drv);
2112 bdrv_img_create(target, format,
2113 NULL, NULL, NULL, size, flags, &local_err, false);
2116 case NEW_IMAGE_MODE_EXISTING:
2118 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
2119 /* create new image with backing file */
2120 bdrv_img_create(target, format,
2122 source->drv->format_name,
2123 NULL, size, flags, &local_err, false);
2130 if (error_is_set(&local_err)) {
2131 error_propagate(errp, local_err);
2135 /* Mirroring takes care of copy-on-write using the source's backing
2138 target_bs = bdrv_new("");
2139 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
2142 bdrv_unref(target_bs);
2143 error_propagate(errp, local_err);
2147 mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
2148 on_source_error, on_target_error,
2149 block_job_cb, bs, &local_err);
2150 if (local_err != NULL) {
2151 bdrv_unref(target_bs);
2152 error_propagate(errp, local_err);
2157 static BlockJob *find_block_job(const char *device)
2159 BlockDriverState *bs;
2161 bs = bdrv_find(device);
2162 if (!bs || !bs->job) {
2168 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2170 BlockJob *job = find_block_job(device);
2173 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2177 block_job_set_speed(job, speed, errp);
2180 void qmp_block_job_cancel(const char *device,
2181 bool has_force, bool force, Error **errp)
2183 BlockJob *job = find_block_job(device);
2190 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2193 if (job->paused && !force) {
2194 error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
2198 trace_qmp_block_job_cancel(job);
2199 block_job_cancel(job);
2202 void qmp_block_job_pause(const char *device, Error **errp)
2204 BlockJob *job = find_block_job(device);
2207 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2211 trace_qmp_block_job_pause(job);
2212 block_job_pause(job);
2215 void qmp_block_job_resume(const char *device, Error **errp)
2217 BlockJob *job = find_block_job(device);
2220 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2224 trace_qmp_block_job_resume(job);
2225 block_job_resume(job);
2228 void qmp_block_job_complete(const char *device, Error **errp)
2230 BlockJob *job = find_block_job(device);
2233 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2237 trace_qmp_block_job_complete(job);
2238 block_job_complete(job, errp);
2241 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
2243 QmpOutputVisitor *ov = qmp_output_visitor_new();
2246 Error *local_err = NULL;
2248 /* Require an ID in the top level */
2249 if (!options->has_id) {
2250 error_setg(errp, "Block device needs an ID");
2254 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with
2255 * cache.direct=false instead of silently switching to aio=threads, except
2256 * if called from drive_init.
2258 * For now, simply forbidding the combination for all drivers will do. */
2259 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2260 bool direct = options->cache->has_direct && options->cache->direct;
2261 if (!options->has_cache && !direct) {
2262 error_setg(errp, "aio=native requires cache.direct=true");
2267 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
2268 &options, NULL, &local_err);
2269 if (error_is_set(&local_err)) {
2270 error_propagate(errp, local_err);
2274 obj = qmp_output_get_qobject(ov);
2275 qdict = qobject_to_qdict(obj);
2277 qdict_flatten(qdict);
2279 blockdev_init(NULL, qdict, IF_NONE, &local_err);
2280 if (error_is_set(&local_err)) {
2281 error_propagate(errp, local_err);
2286 qmp_output_visitor_cleanup(ov);
2289 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
2291 BlockJobInfoList **prev = opaque;
2292 BlockJob *job = bs->job;
2295 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
2296 elem->value = block_job_query(bs->job);
2297 (*prev)->next = elem;
2302 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
2304 /* Dummy is a fake list element for holding the head pointer */
2305 BlockJobInfoList dummy = {};
2306 BlockJobInfoList *prev = &dummy;
2307 bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
2311 QemuOptsList qemu_common_drive_opts = {
2313 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2317 .type = QEMU_OPT_BOOL,
2318 .help = "enable/disable snapshot mode",
2321 .type = QEMU_OPT_STRING,
2322 .help = "discard operation (ignore/off, unmap/on)",
2324 .name = "cache.writeback",
2325 .type = QEMU_OPT_BOOL,
2326 .help = "enables writeback mode for any caches",
2328 .name = "cache.direct",
2329 .type = QEMU_OPT_BOOL,
2330 .help = "enables use of O_DIRECT (bypass the host page cache)",
2332 .name = "cache.no-flush",
2333 .type = QEMU_OPT_BOOL,
2334 .help = "ignore any flush requests for the device",
2337 .type = QEMU_OPT_STRING,
2338 .help = "host AIO implementation (threads, native)",
2341 .type = QEMU_OPT_STRING,
2342 .help = "disk format (raw, qcow2, ...)",
2345 .type = QEMU_OPT_STRING,
2346 .help = "disk serial number",
2349 .type = QEMU_OPT_STRING,
2350 .help = "read error action",
2353 .type = QEMU_OPT_STRING,
2354 .help = "write error action",
2356 .name = "read-only",
2357 .type = QEMU_OPT_BOOL,
2358 .help = "open drive file as read-only",
2360 .name = "throttling.iops-total",
2361 .type = QEMU_OPT_NUMBER,
2362 .help = "limit total I/O operations per second",
2364 .name = "throttling.iops-read",
2365 .type = QEMU_OPT_NUMBER,
2366 .help = "limit read operations per second",
2368 .name = "throttling.iops-write",
2369 .type = QEMU_OPT_NUMBER,
2370 .help = "limit write operations per second",
2372 .name = "throttling.bps-total",
2373 .type = QEMU_OPT_NUMBER,
2374 .help = "limit total bytes per second",
2376 .name = "throttling.bps-read",
2377 .type = QEMU_OPT_NUMBER,
2378 .help = "limit read bytes per second",
2380 .name = "throttling.bps-write",
2381 .type = QEMU_OPT_NUMBER,
2382 .help = "limit write bytes per second",
2384 .name = "throttling.iops-total-max",
2385 .type = QEMU_OPT_NUMBER,
2386 .help = "I/O operations burst",
2388 .name = "throttling.iops-read-max",
2389 .type = QEMU_OPT_NUMBER,
2390 .help = "I/O operations read burst",
2392 .name = "throttling.iops-write-max",
2393 .type = QEMU_OPT_NUMBER,
2394 .help = "I/O operations write burst",
2396 .name = "throttling.bps-total-max",
2397 .type = QEMU_OPT_NUMBER,
2398 .help = "total bytes burst",
2400 .name = "throttling.bps-read-max",
2401 .type = QEMU_OPT_NUMBER,
2402 .help = "total bytes read burst",
2404 .name = "throttling.bps-write-max",
2405 .type = QEMU_OPT_NUMBER,
2406 .help = "total bytes write burst",
2408 .name = "throttling.iops-size",
2409 .type = QEMU_OPT_NUMBER,
2410 .help = "when limiting by iops max size of an I/O in bytes",
2412 .name = "copy-on-read",
2413 .type = QEMU_OPT_BOOL,
2414 .help = "copy read data from backing file into image file",
2416 { /* end of list */ }
2420 QemuOptsList qemu_drive_opts = {
2422 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
2425 * no elements => accept any params
2426 * validation will happen later
2428 { /* end of list */ }