2 * QEMU host block devices
4 * Copyright (c) 2003-2008 Fabrice Bellard
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
9 * This file incorporates work covered by the following copyright and
12 * Copyright (c) 2003-2008 Fabrice Bellard
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
33 #include "sysemu/block-backend.h"
34 #include "sysemu/blockdev.h"
35 #include "hw/block/block.h"
36 #include "block/blockjob.h"
37 #include "block/throttle-groups.h"
38 #include "monitor/monitor.h"
39 #include "qemu/error-report.h"
40 #include "qemu/option.h"
41 #include "qemu/config-file.h"
42 #include "qapi/qmp/types.h"
43 #include "qapi-visit.h"
44 #include "qapi/qmp/qerror.h"
45 #include "qapi/qmp-output-visitor.h"
46 #include "qapi/util.h"
47 #include "sysemu/sysemu.h"
48 #include "block/block_int.h"
49 #include "qmp-commands.h"
51 #include "sysemu/arch_init.h"
53 static const char *const if_name[IF_COUNT] = {
57 [IF_FLOPPY] = "floppy",
58 [IF_PFLASH] = "pflash",
61 [IF_VIRTIO] = "virtio",
65 static int if_max_devs[IF_COUNT] = {
67 * Do not change these numbers! They govern how drive option
68 * index maps to unit and bus. That mapping is ABI.
70 * All controllers used to imlement if=T drives need to support
71 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
72 * Otherwise, some index values map to "impossible" bus, unit
75 * For instance, if you change [IF_SCSI] to 255, -drive
76 * if=scsi,index=12 no longer means bus=1,unit=5, but
77 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
78 * the drive can't be set up. Regression.
85 * Boards may call this to offer board-by-board overrides
86 * of the default, global values.
88 void override_max_devs(BlockInterfaceType type, int max_devs)
97 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
98 dinfo = blk_legacy_dinfo(blk);
99 if (dinfo->type == type) {
100 fprintf(stderr, "Cannot override units-per-bus property of"
101 " the %s interface, because a drive of that type has"
102 " already been added.\n", if_name[type]);
103 g_assert_not_reached();
107 if_max_devs[type] = max_devs;
111 * We automatically delete the drive when a device using it gets
112 * unplugged. Questionable feature, but we can't just drop it.
113 * Device models call blockdev_mark_auto_del() to schedule the
114 * automatic deletion, and generic qdev code calls blockdev_auto_del()
115 * when deletion is actually safe.
117 void blockdev_mark_auto_del(BlockBackend *blk)
119 DriveInfo *dinfo = blk_legacy_dinfo(blk);
120 BlockDriverState *bs = blk_bs(blk);
121 AioContext *aio_context;
128 aio_context = bdrv_get_aio_context(bs);
129 aio_context_acquire(aio_context);
132 block_job_cancel(bs->job);
135 aio_context_release(aio_context);
141 void blockdev_auto_del(BlockBackend *blk)
143 DriveInfo *dinfo = blk_legacy_dinfo(blk);
145 if (dinfo && dinfo->auto_del) {
151 * Returns the current mapping of how many units per bus
152 * a particular interface can support.
154 * A positive integer indicates n units per bus.
155 * 0 implies the mapping has not been established.
156 * -1 indicates an invalid BlockInterfaceType was given.
158 int drive_get_max_devs(BlockInterfaceType type)
160 if (type >= IF_IDE && type < IF_COUNT) {
161 return if_max_devs[type];
167 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
169 int max_devs = if_max_devs[type];
170 return max_devs ? index / max_devs : 0;
173 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
175 int max_devs = if_max_devs[type];
176 return max_devs ? index % max_devs : index;
179 QemuOpts *drive_def(const char *optstr)
181 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
184 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
189 opts = drive_def(optstr);
193 if (type != IF_DEFAULT) {
194 qemu_opt_set(opts, "if", if_name[type], &error_abort);
197 qemu_opt_set_number(opts, "index", index, &error_abort);
200 qemu_opt_set(opts, "file", file, &error_abort);
204 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
209 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
210 dinfo = blk_legacy_dinfo(blk);
211 if (dinfo && dinfo->type == type
212 && dinfo->bus == bus && dinfo->unit == unit) {
220 bool drive_check_orphaned(void)
226 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
227 dinfo = blk_legacy_dinfo(blk);
228 /* If dinfo->bdrv->dev is NULL, it has no device attached. */
229 /* Unless this is a default drive, this may be an oversight. */
230 if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
231 dinfo->type != IF_NONE) {
232 fprintf(stderr, "Warning: Orphaned drive without device: "
233 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
234 blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
235 if_name[dinfo->type], dinfo->bus, dinfo->unit);
243 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
245 return drive_get(type,
246 drive_index_to_bus_id(type, index),
247 drive_index_to_unit_id(type, index));
250 int drive_get_max_bus(BlockInterfaceType type)
257 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
258 dinfo = blk_legacy_dinfo(blk);
259 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
260 max_bus = dinfo->bus;
266 /* Get a block device. This should only be used for single-drive devices
267 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
269 DriveInfo *drive_get_next(BlockInterfaceType type)
271 static int next_block_unit[IF_COUNT];
273 return drive_get(type, 0, next_block_unit[type]++);
276 static void bdrv_format_print(void *opaque, const char *name)
278 error_printf(" %s", name);
283 BlockDriverState *bs;
286 static void bdrv_put_ref_bh(void *opaque)
288 BDRVPutRefBH *s = opaque;
291 qemu_bh_delete(s->bh);
296 * Release a BDS reference in a BH
298 * It is not safe to use bdrv_unref() from a callback function when the callers
299 * still need the BlockDriverState. In such cases we schedule a BH to release
302 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
306 s = g_new(BDRVPutRefBH, 1);
307 s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
309 qemu_bh_schedule(s->bh);
312 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
314 if (!strcmp(buf, "ignore")) {
315 return BLOCKDEV_ON_ERROR_IGNORE;
316 } else if (!is_read && !strcmp(buf, "enospc")) {
317 return BLOCKDEV_ON_ERROR_ENOSPC;
318 } else if (!strcmp(buf, "stop")) {
319 return BLOCKDEV_ON_ERROR_STOP;
320 } else if (!strcmp(buf, "report")) {
321 return BLOCKDEV_ON_ERROR_REPORT;
323 error_setg(errp, "'%s' invalid %s error action",
324 buf, is_read ? "read" : "write");
329 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
331 if (throttle_conflicting(cfg)) {
332 error_setg(errp, "bps/iops/max total values and read/write values"
333 " cannot be used at the same time");
337 if (!throttle_is_valid(cfg)) {
338 error_setg(errp, "bps/iops/maxs values must be 0 or greater");
342 if (throttle_max_is_missing_limit(cfg)) {
343 error_setg(errp, "bps_max/iops_max require corresponding"
351 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
353 /* All parameters but @opts are optional and may be set to NULL. */
354 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
355 const char **throttling_group, ThrottleConfig *throttle_cfg,
356 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
359 Error *local_error = NULL;
363 if (!qemu_opt_get_bool(opts, "read-only", false)) {
364 *bdrv_flags |= BDRV_O_RDWR;
366 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
367 *bdrv_flags |= BDRV_O_COPY_ON_READ;
370 if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
371 if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
372 error_setg(errp, "Invalid discard option");
377 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) {
378 *bdrv_flags |= BDRV_O_CACHE_WB;
380 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) {
381 *bdrv_flags |= BDRV_O_NOCACHE;
383 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) {
384 *bdrv_flags |= BDRV_O_NO_FLUSH;
387 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
388 if (!strcmp(aio, "native")) {
389 *bdrv_flags |= BDRV_O_NATIVE_AIO;
390 } else if (!strcmp(aio, "threads")) {
391 /* this is the default */
393 error_setg(errp, "invalid aio option");
399 /* disk I/O throttling */
400 if (throttling_group) {
401 *throttling_group = qemu_opt_get(opts, "throttling.group");
405 memset(throttle_cfg, 0, sizeof(*throttle_cfg));
406 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
407 qemu_opt_get_number(opts, "throttling.bps-total", 0);
408 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
409 qemu_opt_get_number(opts, "throttling.bps-read", 0);
410 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
411 qemu_opt_get_number(opts, "throttling.bps-write", 0);
412 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
413 qemu_opt_get_number(opts, "throttling.iops-total", 0);
414 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
415 qemu_opt_get_number(opts, "throttling.iops-read", 0);
416 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
417 qemu_opt_get_number(opts, "throttling.iops-write", 0);
419 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
420 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
421 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
422 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
423 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
424 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
425 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
426 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
427 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
428 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
429 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
430 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
432 throttle_cfg->op_size =
433 qemu_opt_get_number(opts, "throttling.iops-size", 0);
435 if (!check_throttle_config(throttle_cfg, errp)) {
442 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
443 qemu_opt_get(opts, "detect-zeroes"),
444 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
445 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
448 error_propagate(errp, local_error);
453 *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
454 !(*bdrv_flags & BDRV_O_UNMAP))
456 error_setg(errp, "setting detect-zeroes to unmap is not allowed "
457 "without setting discard operation to unmap");
463 /* Takes the ownership of bs_opts */
464 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
469 int on_read_error, on_write_error;
471 BlockDriverState *bs;
477 bool has_driver_specific_opts;
478 BlockdevDetectZeroesOptions detect_zeroes =
479 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
480 const char *throttling_group = NULL;
482 /* Check common options by copying from bs_opts to opts, all other options
483 * stay in bs_opts for processing by bdrv_open(). */
484 id = qdict_get_try_str(bs_opts, "id");
485 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
487 error_propagate(errp, error);
491 qemu_opts_absorb_qdict(opts, bs_opts, &error);
493 error_propagate(errp, error);
498 qdict_del(bs_opts, "id");
501 has_driver_specific_opts = !!qdict_size(bs_opts);
503 /* extract parameters */
504 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
506 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
507 &detect_zeroes, &error);
509 error_propagate(errp, error);
513 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
514 if (is_help_option(buf)) {
515 error_printf("Supported formats:");
516 bdrv_iterate_format(bdrv_format_print, NULL);
521 if (qdict_haskey(bs_opts, "driver")) {
522 error_setg(errp, "Cannot specify both 'driver' and 'format'");
525 qdict_put(bs_opts, "driver", qstring_from_str(buf));
528 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
529 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
530 on_write_error = parse_block_error_action(buf, 0, &error);
532 error_propagate(errp, error);
537 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
538 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
539 on_read_error = parse_block_error_action(buf, 1, &error);
541 error_propagate(errp, error);
547 /* always use cache=unsafe with snapshot */
548 bdrv_flags &= ~BDRV_O_CACHE_MASK;
549 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
553 if ((!file || !*file) && !has_driver_specific_opts) {
554 BlockBackendRootState *blk_rs;
556 blk = blk_new(qemu_opts_id(opts), errp);
561 blk_rs = blk_get_root_state(blk);
562 blk_rs->open_flags = bdrv_flags;
563 blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR);
564 blk_rs->detect_zeroes = detect_zeroes;
566 if (throttle_enabled(&cfg)) {
567 if (!throttling_group) {
568 throttling_group = blk_name(blk);
570 blk_rs->throttle_group = g_strdup(throttling_group);
571 blk_rs->throttle_state = throttle_group_incref(throttling_group);
572 blk_rs->throttle_state->cfg = cfg;
577 if (file && !*file) {
581 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
588 bs->detect_zeroes = detect_zeroes;
590 /* disk I/O throttling */
591 if (throttle_enabled(&cfg)) {
592 if (!throttling_group) {
593 throttling_group = blk_name(blk);
595 bdrv_io_limits_enable(bs, throttling_group);
596 bdrv_set_io_limits(bs, &cfg);
599 if (bdrv_key_required(bs)) {
604 blk_set_on_error(blk, on_read_error, on_write_error);
617 static QemuOptsList qemu_root_bds_opts;
619 /* Takes the ownership of bs_opts */
620 static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
622 BlockDriverState *bs;
624 Error *local_error = NULL;
625 BlockdevDetectZeroesOptions detect_zeroes;
629 opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp);
634 qemu_opts_absorb_qdict(opts, bs_opts, &local_error);
636 error_propagate(errp, local_error);
640 extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL,
641 &detect_zeroes, &local_error);
643 error_propagate(errp, local_error);
648 ret = bdrv_open(&bs, NULL, NULL, bs_opts, bdrv_flags, errp);
650 goto fail_no_bs_opts;
653 bs->detect_zeroes = detect_zeroes;
665 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
670 value = qemu_opt_get(opts, from);
672 if (qemu_opt_find(opts, to)) {
673 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
674 "same time", to, from);
679 /* rename all items in opts */
680 while ((value = qemu_opt_get(opts, from))) {
681 qemu_opt_set(opts, to, value, &error_abort);
682 qemu_opt_unset(opts, from);
686 QemuOptsList qemu_legacy_drive_opts = {
688 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
692 .type = QEMU_OPT_NUMBER,
693 .help = "bus number",
696 .type = QEMU_OPT_NUMBER,
697 .help = "unit number (i.e. lun for scsi)",
700 .type = QEMU_OPT_NUMBER,
701 .help = "index number",
704 .type = QEMU_OPT_STRING,
705 .help = "media type (disk, cdrom)",
708 .type = QEMU_OPT_STRING,
709 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
712 .type = QEMU_OPT_NUMBER,
713 .help = "number of cylinders (ide disk geometry)",
716 .type = QEMU_OPT_NUMBER,
717 .help = "number of heads (ide disk geometry)",
720 .type = QEMU_OPT_NUMBER,
721 .help = "number of sectors (ide disk geometry)",
724 .type = QEMU_OPT_STRING,
725 .help = "chs translation (auto, lba, none)",
728 .type = QEMU_OPT_BOOL,
729 .help = "(deprecated, ignored)",
732 .type = QEMU_OPT_STRING,
733 .help = "pci address (virtio only)",
736 .type = QEMU_OPT_STRING,
737 .help = "disk serial number",
740 .type = QEMU_OPT_STRING,
744 /* Options that are passed on, but have special semantics with -drive */
747 .type = QEMU_OPT_BOOL,
748 .help = "open drive file as read-only",
751 .type = QEMU_OPT_STRING,
752 .help = "read error action",
755 .type = QEMU_OPT_STRING,
756 .help = "write error action",
758 .name = "copy-on-read",
759 .type = QEMU_OPT_BOOL,
760 .help = "copy read data from backing file into image file",
763 { /* end of list */ }
767 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
771 DriveInfo *dinfo = NULL;
773 QemuOpts *legacy_opts;
774 DriveMediaType media = MEDIA_DISK;
775 BlockInterfaceType type;
776 int cyls, heads, secs, translation;
777 int max_devs, bus_id, unit_id, index;
779 const char *werror, *rerror;
780 bool read_only = false;
783 const char *filename;
784 Error *local_err = NULL;
787 /* Change legacy command line options into QMP ones */
788 static const struct {
792 { "iops", "throttling.iops-total" },
793 { "iops_rd", "throttling.iops-read" },
794 { "iops_wr", "throttling.iops-write" },
796 { "bps", "throttling.bps-total" },
797 { "bps_rd", "throttling.bps-read" },
798 { "bps_wr", "throttling.bps-write" },
800 { "iops_max", "throttling.iops-total-max" },
801 { "iops_rd_max", "throttling.iops-read-max" },
802 { "iops_wr_max", "throttling.iops-write-max" },
804 { "bps_max", "throttling.bps-total-max" },
805 { "bps_rd_max", "throttling.bps-read-max" },
806 { "bps_wr_max", "throttling.bps-write-max" },
808 { "iops_size", "throttling.iops-size" },
810 { "group", "throttling.group" },
812 { "readonly", "read-only" },
815 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
816 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
819 error_report_err(local_err);
824 value = qemu_opt_get(all_opts, "cache");
828 if (bdrv_parse_cache_flags(value, &flags) != 0) {
829 error_report("invalid cache option");
833 /* Specific options take precedence */
834 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
835 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
836 !!(flags & BDRV_O_CACHE_WB), &error_abort);
838 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
839 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
840 !!(flags & BDRV_O_NOCACHE), &error_abort);
842 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
843 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
844 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
846 qemu_opt_unset(all_opts, "cache");
849 /* Get a QDict for processing the options */
850 bs_opts = qdict_new();
851 qemu_opts_to_qdict(all_opts, bs_opts);
853 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
855 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
857 error_report_err(local_err);
861 /* Deprecated option boot=[on|off] */
862 if (qemu_opt_get(legacy_opts, "boot") != NULL) {
863 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be "
864 "ignored. Future versions will reject this parameter. Please "
865 "update your scripts.\n");
869 value = qemu_opt_get(legacy_opts, "media");
871 if (!strcmp(value, "disk")) {
873 } else if (!strcmp(value, "cdrom")) {
877 error_report("'%s' invalid media", value);
882 /* copy-on-read is disabled with a warning for read-only devices */
883 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
884 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
886 if (read_only && copy_on_read) {
887 error_report("warning: disabling copy-on-read on read-only drive");
888 copy_on_read = false;
891 qdict_put(bs_opts, "read-only",
892 qstring_from_str(read_only ? "on" : "off"));
893 qdict_put(bs_opts, "copy-on-read",
894 qstring_from_str(copy_on_read ? "on" :"off"));
896 /* Controller type */
897 value = qemu_opt_get(legacy_opts, "if");
900 type < IF_COUNT && strcmp(value, if_name[type]);
903 if (type == IF_COUNT) {
904 error_report("unsupported bus type '%s'", value);
908 type = block_default_type;
912 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0);
913 heads = qemu_opt_get_number(legacy_opts, "heads", 0);
914 secs = qemu_opt_get_number(legacy_opts, "secs", 0);
916 if (cyls || heads || secs) {
918 error_report("invalid physical cyls number");
922 error_report("invalid physical heads number");
926 error_report("invalid physical secs number");
931 translation = BIOS_ATA_TRANSLATION_AUTO;
932 value = qemu_opt_get(legacy_opts, "trans");
935 error_report("'%s' trans must be used with cyls, heads and secs",
939 if (!strcmp(value, "none")) {
940 translation = BIOS_ATA_TRANSLATION_NONE;
941 } else if (!strcmp(value, "lba")) {
942 translation = BIOS_ATA_TRANSLATION_LBA;
943 } else if (!strcmp(value, "large")) {
944 translation = BIOS_ATA_TRANSLATION_LARGE;
945 } else if (!strcmp(value, "rechs")) {
946 translation = BIOS_ATA_TRANSLATION_RECHS;
947 } else if (!strcmp(value, "auto")) {
948 translation = BIOS_ATA_TRANSLATION_AUTO;
950 error_report("'%s' invalid translation type", value);
955 if (media == MEDIA_CDROM) {
956 if (cyls || secs || heads) {
957 error_report("CHS can't be set with media=cdrom");
962 /* Device address specified by bus/unit or index.
963 * If none was specified, try to find the first free one. */
964 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
965 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
966 index = qemu_opt_get_number(legacy_opts, "index", -1);
968 max_devs = if_max_devs[type];
971 if (bus_id != 0 || unit_id != -1) {
972 error_report("index cannot be used with bus and unit");
975 bus_id = drive_index_to_bus_id(type, index);
976 unit_id = drive_index_to_unit_id(type, index);
981 while (drive_get(type, bus_id, unit_id) != NULL) {
983 if (max_devs && unit_id >= max_devs) {
990 if (max_devs && unit_id >= max_devs) {
991 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1);
995 if (drive_get(type, bus_id, unit_id) != NULL) {
996 error_report("drive with bus=%d, unit=%d (index=%d) exists",
997 bus_id, unit_id, index);
1002 serial = qemu_opt_get(legacy_opts, "serial");
1004 /* no id supplied -> create one */
1005 if (qemu_opts_id(all_opts) == NULL) {
1007 const char *mediastr = "";
1008 if (type == IF_IDE || type == IF_SCSI) {
1009 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
1012 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
1015 new_id = g_strdup_printf("%s%s%i", if_name[type],
1018 qdict_put(bs_opts, "id", qstring_from_str(new_id));
1022 /* Add virtio block device */
1023 devaddr = qemu_opt_get(legacy_opts, "addr");
1024 if (devaddr && type != IF_VIRTIO) {
1025 error_report("addr is not supported by this bus type");
1029 if (type == IF_VIRTIO) {
1031 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
1033 if (arch_type == QEMU_ARCH_S390X) {
1034 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
1036 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
1038 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
1041 qemu_opt_set(devopts, "addr", devaddr, &error_abort);
1045 filename = qemu_opt_get(legacy_opts, "file");
1047 /* Check werror/rerror compatibility with if=... */
1048 werror = qemu_opt_get(legacy_opts, "werror");
1049 if (werror != NULL) {
1050 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
1052 error_report("werror is not supported by this bus type");
1055 qdict_put(bs_opts, "werror", qstring_from_str(werror));
1058 rerror = qemu_opt_get(legacy_opts, "rerror");
1059 if (rerror != NULL) {
1060 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1062 error_report("rerror is not supported by this bus type");
1065 qdict_put(bs_opts, "rerror", qstring_from_str(rerror));
1068 /* Actual block device init: Functionality shared with blockdev-add */
1069 blk = blockdev_init(filename, bs_opts, &local_err);
1073 error_report_err(local_err);
1080 /* Create legacy DriveInfo */
1081 dinfo = g_malloc0(sizeof(*dinfo));
1082 dinfo->opts = all_opts;
1085 dinfo->heads = heads;
1087 dinfo->trans = translation;
1090 dinfo->bus = bus_id;
1091 dinfo->unit = unit_id;
1092 dinfo->devaddr = devaddr;
1093 dinfo->serial = g_strdup(serial);
1095 blk_set_legacy_dinfo(blk, dinfo);
1102 dinfo->media_cd = media == MEDIA_CDROM;
1109 qemu_opts_del(legacy_opts);
1114 void hmp_commit(Monitor *mon, const QDict *qdict)
1116 const char *device = qdict_get_str(qdict, "device");
1120 if (!strcmp(device, "all")) {
1121 ret = bdrv_commit_all();
1123 BlockDriverState *bs;
1124 AioContext *aio_context;
1126 blk = blk_by_name(device);
1128 monitor_printf(mon, "Device '%s' not found\n", device);
1131 if (!blk_is_available(blk)) {
1132 monitor_printf(mon, "Device '%s' has no medium\n", device);
1137 aio_context = bdrv_get_aio_context(bs);
1138 aio_context_acquire(aio_context);
1140 ret = bdrv_commit(bs);
1142 aio_context_release(aio_context);
1145 monitor_printf(mon, "'commit' error for '%s': %s\n", device,
1150 static void blockdev_do_action(TransactionActionKind type, void *data,
1153 TransactionAction action;
1154 TransactionActionList list;
1157 action.u.data = data;
1158 list.value = &action;
1160 qmp_transaction(&list, errp);
1163 void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
1164 bool has_node_name, const char *node_name,
1165 const char *snapshot_file,
1166 bool has_snapshot_node_name,
1167 const char *snapshot_node_name,
1168 bool has_format, const char *format,
1169 bool has_mode, NewImageMode mode, Error **errp)
1171 BlockdevSnapshot snapshot = {
1172 .has_device = has_device,
1173 .device = (char *) device,
1174 .has_node_name = has_node_name,
1175 .node_name = (char *) node_name,
1176 .snapshot_file = (char *) snapshot_file,
1177 .has_snapshot_node_name = has_snapshot_node_name,
1178 .snapshot_node_name = (char *) snapshot_node_name,
1179 .has_format = has_format,
1180 .format = (char *) format,
1181 .has_mode = has_mode,
1184 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1188 void qmp_blockdev_snapshot_internal_sync(const char *device,
1192 BlockdevSnapshotInternal snapshot = {
1193 .device = (char *) device,
1194 .name = (char *) name
1197 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1201 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1208 BlockDriverState *bs;
1210 AioContext *aio_context;
1211 QEMUSnapshotInfo sn;
1212 Error *local_err = NULL;
1213 SnapshotInfo *info = NULL;
1216 blk = blk_by_name(device);
1218 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1219 "Device '%s' not found", device);
1223 aio_context = blk_get_aio_context(blk);
1224 aio_context_acquire(aio_context);
1235 error_setg(errp, "Name or id must be provided");
1236 goto out_aio_context;
1239 if (!blk_is_available(blk)) {
1240 error_setg(errp, "Device '%s' has no medium", device);
1241 goto out_aio_context;
1245 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1246 goto out_aio_context;
1249 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1251 error_propagate(errp, local_err);
1252 goto out_aio_context;
1256 "Snapshot with id '%s' and name '%s' does not exist on "
1258 STR_OR_NULL(id), STR_OR_NULL(name), device);
1259 goto out_aio_context;
1262 bdrv_snapshot_delete(bs, id, name, &local_err);
1264 error_propagate(errp, local_err);
1265 goto out_aio_context;
1268 aio_context_release(aio_context);
1270 info = g_new0(SnapshotInfo, 1);
1271 info->id = g_strdup(sn.id_str);
1272 info->name = g_strdup(sn.name);
1273 info->date_nsec = sn.date_nsec;
1274 info->date_sec = sn.date_sec;
1275 info->vm_state_size = sn.vm_state_size;
1276 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1277 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1282 aio_context_release(aio_context);
1287 * block_dirty_bitmap_lookup:
1288 * Return a dirty bitmap (if present), after validating
1289 * the node reference and bitmap names.
1291 * @node: The name of the BDS node to search for bitmaps
1292 * @name: The name of the bitmap to search for
1293 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
1294 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
1295 * @errp: Output pointer for error information. Can be NULL.
1297 * @return: A bitmap object on success, or NULL on failure.
1299 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
1301 BlockDriverState **pbs,
1305 BlockDriverState *bs;
1306 BdrvDirtyBitmap *bitmap;
1307 AioContext *aio_context;
1310 error_setg(errp, "Node cannot be NULL");
1314 error_setg(errp, "Bitmap name cannot be NULL");
1317 bs = bdrv_lookup_bs(node, node, NULL);
1319 error_setg(errp, "Node '%s' not found", node);
1323 aio_context = bdrv_get_aio_context(bs);
1324 aio_context_acquire(aio_context);
1326 bitmap = bdrv_find_dirty_bitmap(bs, name);
1328 error_setg(errp, "Dirty bitmap '%s' not found", name);
1336 *paio = aio_context;
1338 aio_context_release(aio_context);
1344 aio_context_release(aio_context);
1348 /* New and old BlockDriverState structs for atomic group operations */
1350 typedef struct BlkTransactionState BlkTransactionState;
1352 /* Only prepare() may fail. In a single transaction, only one of commit() or
1353 abort() will be called, clean() will always be called if it present. */
1354 typedef struct BdrvActionOps {
1355 /* Size of state struct, in bytes. */
1356 size_t instance_size;
1357 /* Prepare the work, must NOT be NULL. */
1358 void (*prepare)(BlkTransactionState *common, Error **errp);
1359 /* Commit the changes, can be NULL. */
1360 void (*commit)(BlkTransactionState *common);
1361 /* Abort the changes on fail, can be NULL. */
1362 void (*abort)(BlkTransactionState *common);
1363 /* Clean up resource in the end, can be NULL. */
1364 void (*clean)(BlkTransactionState *common);
1368 * This structure must be arranged as first member in child type, assuming
1369 * that compiler will also arrange it to the same address with parent instance.
1370 * Later it will be used in free().
1372 struct BlkTransactionState {
1373 TransactionAction *action;
1374 const BdrvActionOps *ops;
1375 QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1378 /* internal snapshot private data */
1379 typedef struct InternalSnapshotState {
1380 BlkTransactionState common;
1381 BlockDriverState *bs;
1382 AioContext *aio_context;
1383 QEMUSnapshotInfo sn;
1385 } InternalSnapshotState;
1387 static void internal_snapshot_prepare(BlkTransactionState *common,
1390 Error *local_err = NULL;
1394 BlockDriverState *bs;
1395 QEMUSnapshotInfo old_sn, *sn;
1398 BlockdevSnapshotInternal *internal;
1399 InternalSnapshotState *state;
1402 g_assert(common->action->type ==
1403 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
1404 internal = common->action->u.blockdev_snapshot_internal_sync;
1405 state = DO_UPCAST(InternalSnapshotState, common, common);
1407 /* 1. parse input */
1408 device = internal->device;
1409 name = internal->name;
1411 /* 2. check for validation */
1412 blk = blk_by_name(device);
1414 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1415 "Device '%s' not found", device);
1419 /* AioContext is released in .clean() */
1420 state->aio_context = blk_get_aio_context(blk);
1421 aio_context_acquire(state->aio_context);
1423 if (!blk_is_available(blk)) {
1424 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1430 bdrv_drained_begin(bs);
1432 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1436 if (bdrv_is_read_only(bs)) {
1437 error_setg(errp, "Device '%s' is read only", device);
1441 if (!bdrv_can_snapshot(bs)) {
1442 error_setg(errp, "Block format '%s' used by device '%s' "
1443 "does not support internal snapshots",
1444 bs->drv->format_name, device);
1448 if (!strlen(name)) {
1449 error_setg(errp, "Name is empty");
1453 /* check whether a snapshot with name exist */
1454 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1457 error_propagate(errp, local_err);
1461 "Snapshot with name '%s' already exists on device '%s'",
1466 /* 3. take the snapshot */
1468 pstrcpy(sn->name, sizeof(sn->name), name);
1469 qemu_gettimeofday(&tv);
1470 sn->date_sec = tv.tv_sec;
1471 sn->date_nsec = tv.tv_usec * 1000;
1472 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1474 ret1 = bdrv_snapshot_create(bs, sn);
1476 error_setg_errno(errp, -ret1,
1477 "Failed to create snapshot '%s' on device '%s'",
1482 /* 4. succeed, mark a snapshot is created */
1483 state->created = true;
1486 static void internal_snapshot_abort(BlkTransactionState *common)
1488 InternalSnapshotState *state =
1489 DO_UPCAST(InternalSnapshotState, common, common);
1490 BlockDriverState *bs = state->bs;
1491 QEMUSnapshotInfo *sn = &state->sn;
1492 Error *local_error = NULL;
1494 if (!state->created) {
1498 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1499 error_report("Failed to delete snapshot with id '%s' and name '%s' on "
1500 "device '%s' in abort: %s",
1503 bdrv_get_device_name(bs),
1504 error_get_pretty(local_error));
1505 error_free(local_error);
1509 static void internal_snapshot_clean(BlkTransactionState *common)
1511 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
1514 if (state->aio_context) {
1516 bdrv_drained_end(state->bs);
1518 aio_context_release(state->aio_context);
1522 /* external snapshot private data */
1523 typedef struct ExternalSnapshotState {
1524 BlkTransactionState common;
1525 BlockDriverState *old_bs;
1526 BlockDriverState *new_bs;
1527 AioContext *aio_context;
1528 } ExternalSnapshotState;
1530 static void external_snapshot_prepare(BlkTransactionState *common,
1535 Error *local_err = NULL;
1536 bool has_device = false;
1538 bool has_node_name = false;
1539 const char *node_name;
1540 bool has_snapshot_node_name = false;
1541 const char *snapshot_node_name;
1542 const char *new_image_file;
1543 const char *format = "qcow2";
1544 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1545 ExternalSnapshotState *state =
1546 DO_UPCAST(ExternalSnapshotState, common, common);
1547 TransactionAction *action = common->action;
1549 /* get parameters */
1550 g_assert(action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1552 has_device = action->u.blockdev_snapshot_sync->has_device;
1553 device = action->u.blockdev_snapshot_sync->device;
1554 has_node_name = action->u.blockdev_snapshot_sync->has_node_name;
1555 node_name = action->u.blockdev_snapshot_sync->node_name;
1556 has_snapshot_node_name =
1557 action->u.blockdev_snapshot_sync->has_snapshot_node_name;
1558 snapshot_node_name = action->u.blockdev_snapshot_sync->snapshot_node_name;
1560 new_image_file = action->u.blockdev_snapshot_sync->snapshot_file;
1561 if (action->u.blockdev_snapshot_sync->has_format) {
1562 format = action->u.blockdev_snapshot_sync->format;
1564 if (action->u.blockdev_snapshot_sync->has_mode) {
1565 mode = action->u.blockdev_snapshot_sync->mode;
1568 /* start processing */
1569 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
1570 has_node_name ? node_name : NULL,
1573 error_propagate(errp, local_err);
1577 if (has_node_name && !has_snapshot_node_name) {
1578 error_setg(errp, "New snapshot node name missing");
1582 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
1583 error_setg(errp, "New snapshot node name already existing");
1587 /* Acquire AioContext now so any threads operating on old_bs stop */
1588 state->aio_context = bdrv_get_aio_context(state->old_bs);
1589 aio_context_acquire(state->aio_context);
1590 bdrv_drained_begin(state->old_bs);
1592 if (!bdrv_is_inserted(state->old_bs)) {
1593 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1597 if (bdrv_op_is_blocked(state->old_bs,
1598 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1602 if (!bdrv_is_read_only(state->old_bs)) {
1603 if (bdrv_flush(state->old_bs)) {
1604 error_setg(errp, QERR_IO_ERROR);
1609 if (!bdrv_is_first_non_filter(state->old_bs)) {
1610 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1614 flags = state->old_bs->open_flags;
1616 /* create new image w/backing file */
1617 if (mode != NEW_IMAGE_MODE_EXISTING) {
1618 bdrv_img_create(new_image_file, format,
1619 state->old_bs->filename,
1620 state->old_bs->drv->format_name,
1621 NULL, -1, flags, &local_err, false);
1623 error_propagate(errp, local_err);
1628 options = qdict_new();
1629 if (has_snapshot_node_name) {
1630 qdict_put(options, "node-name",
1631 qstring_from_str(snapshot_node_name));
1633 qdict_put(options, "driver", qstring_from_str(format));
1635 /* TODO Inherit bs->options or only take explicit options with an
1636 * extended QMP command? */
1637 assert(state->new_bs == NULL);
1638 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1639 flags | BDRV_O_NO_BACKING, &local_err);
1640 /* We will manually add the backing_hd field to the bs later */
1642 error_propagate(errp, local_err);
1646 static void external_snapshot_commit(BlkTransactionState *common)
1648 ExternalSnapshotState *state =
1649 DO_UPCAST(ExternalSnapshotState, common, common);
1651 bdrv_set_aio_context(state->new_bs, state->aio_context);
1653 /* This removes our old bs and adds the new bs */
1654 bdrv_append(state->new_bs, state->old_bs);
1655 /* We don't need (or want) to use the transactional
1656 * bdrv_reopen_multiple() across all the entries at once, because we
1657 * don't want to abort all of them if one of them fails the reopen */
1658 bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1662 static void external_snapshot_abort(BlkTransactionState *common)
1664 ExternalSnapshotState *state =
1665 DO_UPCAST(ExternalSnapshotState, common, common);
1666 if (state->new_bs) {
1667 bdrv_unref(state->new_bs);
1671 static void external_snapshot_clean(BlkTransactionState *common)
1673 ExternalSnapshotState *state =
1674 DO_UPCAST(ExternalSnapshotState, common, common);
1675 if (state->aio_context) {
1676 bdrv_drained_end(state->old_bs);
1677 aio_context_release(state->aio_context);
1681 typedef struct DriveBackupState {
1682 BlkTransactionState common;
1683 BlockDriverState *bs;
1684 AioContext *aio_context;
1688 static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
1690 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1692 DriveBackup *backup;
1693 Error *local_err = NULL;
1695 assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
1696 backup = common->action->u.drive_backup;
1698 blk = blk_by_name(backup->device);
1700 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1701 "Device '%s' not found", backup->device);
1705 if (!blk_is_available(blk)) {
1706 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1710 /* AioContext is released in .clean() */
1711 state->aio_context = blk_get_aio_context(blk);
1712 aio_context_acquire(state->aio_context);
1713 bdrv_drained_begin(blk_bs(blk));
1714 state->bs = blk_bs(blk);
1716 qmp_drive_backup(backup->device, backup->target,
1717 backup->has_format, backup->format,
1719 backup->has_mode, backup->mode,
1720 backup->has_speed, backup->speed,
1721 backup->has_bitmap, backup->bitmap,
1722 backup->has_on_source_error, backup->on_source_error,
1723 backup->has_on_target_error, backup->on_target_error,
1726 error_propagate(errp, local_err);
1730 state->job = state->bs->job;
1733 static void drive_backup_abort(BlkTransactionState *common)
1735 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1736 BlockDriverState *bs = state->bs;
1738 /* Only cancel if it's the job we started */
1739 if (bs && bs->job && bs->job == state->job) {
1740 block_job_cancel_sync(bs->job);
1744 static void drive_backup_clean(BlkTransactionState *common)
1746 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1748 if (state->aio_context) {
1749 bdrv_drained_end(state->bs);
1750 aio_context_release(state->aio_context);
1754 typedef struct BlockdevBackupState {
1755 BlkTransactionState common;
1756 BlockDriverState *bs;
1758 AioContext *aio_context;
1759 } BlockdevBackupState;
1761 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
1763 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1764 BlockdevBackup *backup;
1765 BlockBackend *blk, *target;
1766 Error *local_err = NULL;
1768 assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
1769 backup = common->action->u.blockdev_backup;
1771 blk = blk_by_name(backup->device);
1773 error_setg(errp, "Device '%s' not found", backup->device);
1777 if (!blk_is_available(blk)) {
1778 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
1782 target = blk_by_name(backup->target);
1784 error_setg(errp, "Device '%s' not found", backup->target);
1788 /* AioContext is released in .clean() */
1789 state->aio_context = blk_get_aio_context(blk);
1790 if (state->aio_context != blk_get_aio_context(target)) {
1791 state->aio_context = NULL;
1792 error_setg(errp, "Backup between two IO threads is not implemented");
1795 aio_context_acquire(state->aio_context);
1796 state->bs = blk_bs(blk);
1797 bdrv_drained_begin(state->bs);
1799 qmp_blockdev_backup(backup->device, backup->target,
1801 backup->has_speed, backup->speed,
1802 backup->has_on_source_error, backup->on_source_error,
1803 backup->has_on_target_error, backup->on_target_error,
1806 error_propagate(errp, local_err);
1810 state->job = state->bs->job;
1813 static void blockdev_backup_abort(BlkTransactionState *common)
1815 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1816 BlockDriverState *bs = state->bs;
1818 /* Only cancel if it's the job we started */
1819 if (bs && bs->job && bs->job == state->job) {
1820 block_job_cancel_sync(bs->job);
1824 static void blockdev_backup_clean(BlkTransactionState *common)
1826 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
1828 if (state->aio_context) {
1829 bdrv_drained_end(state->bs);
1830 aio_context_release(state->aio_context);
1834 static void abort_prepare(BlkTransactionState *common, Error **errp)
1836 error_setg(errp, "Transaction aborted using Abort action");
1839 static void abort_commit(BlkTransactionState *common)
1841 g_assert_not_reached(); /* this action never succeeds */
1844 static const BdrvActionOps actions[] = {
1845 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1846 .instance_size = sizeof(ExternalSnapshotState),
1847 .prepare = external_snapshot_prepare,
1848 .commit = external_snapshot_commit,
1849 .abort = external_snapshot_abort,
1850 .clean = external_snapshot_clean,
1852 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
1853 .instance_size = sizeof(DriveBackupState),
1854 .prepare = drive_backup_prepare,
1855 .abort = drive_backup_abort,
1856 .clean = drive_backup_clean,
1858 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
1859 .instance_size = sizeof(BlockdevBackupState),
1860 .prepare = blockdev_backup_prepare,
1861 .abort = blockdev_backup_abort,
1862 .clean = blockdev_backup_clean,
1864 [TRANSACTION_ACTION_KIND_ABORT] = {
1865 .instance_size = sizeof(BlkTransactionState),
1866 .prepare = abort_prepare,
1867 .commit = abort_commit,
1869 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
1870 .instance_size = sizeof(InternalSnapshotState),
1871 .prepare = internal_snapshot_prepare,
1872 .abort = internal_snapshot_abort,
1873 .clean = internal_snapshot_clean,
1878 * 'Atomic' group operations. The operations are performed as a set, and if
1879 * any fail then we roll back all operations in the group.
1881 void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1883 TransactionActionList *dev_entry = dev_list;
1884 BlkTransactionState *state, *next;
1885 Error *local_err = NULL;
1887 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1888 QSIMPLEQ_INIT(&snap_bdrv_states);
1890 /* drain all i/o before any operations */
1893 /* We don't do anything in this loop that commits us to the operations */
1894 while (NULL != dev_entry) {
1895 TransactionAction *dev_info = NULL;
1896 const BdrvActionOps *ops;
1898 dev_info = dev_entry->value;
1899 dev_entry = dev_entry->next;
1901 assert(dev_info->type < ARRAY_SIZE(actions));
1903 ops = &actions[dev_info->type];
1904 assert(ops->instance_size > 0);
1906 state = g_malloc0(ops->instance_size);
1908 state->action = dev_info;
1909 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1911 state->ops->prepare(state, &local_err);
1913 error_propagate(errp, local_err);
1914 goto delete_and_fail;
1918 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1919 if (state->ops->commit) {
1920 state->ops->commit(state);
1928 /* failure, and it is all-or-none; roll back all operations */
1929 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1930 if (state->ops->abort) {
1931 state->ops->abort(state);
1935 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
1936 if (state->ops->clean) {
1937 state->ops->clean(state);
1944 static void eject_device(BlockBackend *blk, int force, Error **errp)
1946 BlockDriverState *bs = blk_bs(blk);
1947 AioContext *aio_context;
1950 /* No medium inserted, so there is nothing to do */
1954 aio_context = bdrv_get_aio_context(bs);
1955 aio_context_acquire(aio_context);
1957 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1960 if (!blk_dev_has_removable_media(blk)) {
1961 error_setg(errp, "Device '%s' is not removable",
1962 bdrv_get_device_name(bs));
1966 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
1967 blk_dev_eject_request(blk, force);
1969 error_setg(errp, "Device '%s' is locked",
1970 bdrv_get_device_name(bs));
1978 aio_context_release(aio_context);
1981 void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1985 blk = blk_by_name(device);
1987 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1988 "Device '%s' not found", device);
1992 eject_device(blk, force, errp);
1995 void qmp_block_passwd(bool has_device, const char *device,
1996 bool has_node_name, const char *node_name,
1997 const char *password, Error **errp)
1999 Error *local_err = NULL;
2000 BlockDriverState *bs;
2001 AioContext *aio_context;
2003 bs = bdrv_lookup_bs(has_device ? device : NULL,
2004 has_node_name ? node_name : NULL,
2007 error_propagate(errp, local_err);
2011 aio_context = bdrv_get_aio_context(bs);
2012 aio_context_acquire(aio_context);
2014 bdrv_add_key(bs, password, errp);
2016 aio_context_release(aio_context);
2019 /* Assumes AioContext is held */
2020 static void qmp_bdrv_open_encrypted(BlockDriverState **pbs,
2021 const char *filename,
2022 int bdrv_flags, const char *format,
2023 const char *password, Error **errp)
2025 Error *local_err = NULL;
2026 QDict *options = NULL;
2030 options = qdict_new();
2031 qdict_put(options, "driver", qstring_from_str(format));
2034 ret = bdrv_open(pbs, filename, NULL, options, bdrv_flags, &local_err);
2036 error_propagate(errp, local_err);
2040 bdrv_add_key(*pbs, password, errp);
2043 void qmp_change_blockdev(const char *device, const char *filename,
2044 const char *format, Error **errp)
2047 BlockDriverState *bs;
2048 AioContext *aio_context;
2053 blk = blk_by_name(device);
2055 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2056 "Device '%s' not found", device);
2062 aio_context = blk_get_aio_context(blk);
2063 aio_context_acquire(aio_context);
2065 eject_device(blk, 0, &err);
2067 error_propagate(errp, err);
2071 bdrv_flags = blk_is_read_only(blk) ? 0 : BDRV_O_RDWR;
2072 bdrv_flags |= blk_get_root_state(blk)->open_flags & ~BDRV_O_RDWR;
2074 qmp_bdrv_open_encrypted(&bs, filename, bdrv_flags, format, NULL, &err);
2076 error_propagate(errp, err);
2081 blk_insert_bs(blk, bs);
2082 /* Has been sent automatically by bdrv_open() if blk_bs(blk) was not
2084 blk_dev_change_media_cb(blk, true);
2088 aio_context_release(aio_context);
2091 void qmp_blockdev_open_tray(const char *device, bool has_force, bool force,
2101 blk = blk_by_name(device);
2103 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2104 "Device '%s' not found", device);
2108 if (!blk_dev_has_removable_media(blk)) {
2109 error_setg(errp, "Device '%s' is not removable", device);
2113 if (blk_dev_is_tray_open(blk)) {
2117 locked = blk_dev_is_medium_locked(blk);
2119 blk_dev_eject_request(blk, force);
2122 if (!locked || force) {
2123 blk_dev_change_media_cb(blk, false);
2127 void qmp_blockdev_close_tray(const char *device, Error **errp)
2131 blk = blk_by_name(device);
2133 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2134 "Device '%s' not found", device);
2138 if (!blk_dev_has_removable_media(blk)) {
2139 error_setg(errp, "Device '%s' is not removable", device);
2143 if (!blk_dev_is_tray_open(blk)) {
2147 blk_dev_change_media_cb(blk, true);
2150 void qmp_blockdev_remove_medium(const char *device, Error **errp)
2153 BlockDriverState *bs;
2154 AioContext *aio_context;
2157 blk = blk_by_name(device);
2159 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2160 "Device '%s' not found", device);
2164 /* For BBs without a device, we can exchange the BDS tree at will */
2165 has_device = blk_get_attached_dev(blk);
2167 if (has_device && !blk_dev_has_removable_media(blk)) {
2168 error_setg(errp, "Device '%s' is not removable", device);
2172 if (has_device && !blk_dev_is_tray_open(blk)) {
2173 error_setg(errp, "Tray of device '%s' is not open", device);
2182 aio_context = bdrv_get_aio_context(bs);
2183 aio_context_acquire(aio_context);
2185 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
2189 /* This follows the convention established by bdrv_make_anon() */
2190 if (bs->device_list.tqe_prev) {
2191 QTAILQ_REMOVE(&bdrv_states, bs, device_list);
2192 bs->device_list.tqe_prev = NULL;
2198 aio_context_release(aio_context);
2201 static void qmp_blockdev_insert_anon_medium(const char *device,
2202 BlockDriverState *bs, Error **errp)
2207 blk = blk_by_name(device);
2209 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2210 "Device '%s' not found", device);
2214 /* For BBs without a device, we can exchange the BDS tree at will */
2215 has_device = blk_get_attached_dev(blk);
2217 if (has_device && !blk_dev_has_removable_media(blk)) {
2218 error_setg(errp, "Device '%s' is not removable", device);
2222 if (has_device && !blk_dev_is_tray_open(blk)) {
2223 error_setg(errp, "Tray of device '%s' is not open", device);
2228 error_setg(errp, "There already is a medium in device '%s'", device);
2232 blk_insert_bs(blk, bs);
2234 QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list);
2237 void qmp_blockdev_insert_medium(const char *device, const char *node_name,
2240 BlockDriverState *bs;
2242 bs = bdrv_find_node(node_name);
2244 error_setg(errp, "Node '%s' not found", node_name);
2249 error_setg(errp, "Node '%s' is already in use by '%s'", node_name,
2254 qmp_blockdev_insert_anon_medium(device, bs, errp);
2257 /* throttling disk I/O limits */
2258 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
2265 bool has_bps_rd_max,
2267 bool has_bps_wr_max,
2271 bool has_iops_rd_max,
2272 int64_t iops_rd_max,
2273 bool has_iops_wr_max,
2274 int64_t iops_wr_max,
2278 const char *group, Error **errp)
2281 BlockDriverState *bs;
2283 AioContext *aio_context;
2285 blk = blk_by_name(device);
2287 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2288 "Device '%s' not found", device);
2292 aio_context = blk_get_aio_context(blk);
2293 aio_context_acquire(aio_context);
2297 error_setg(errp, "Device '%s' has no medium", device);
2301 memset(&cfg, 0, sizeof(cfg));
2302 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps;
2303 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd;
2304 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr;
2306 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops;
2307 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd;
2308 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr;
2311 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max;
2313 if (has_bps_rd_max) {
2314 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max;
2316 if (has_bps_wr_max) {
2317 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max;
2320 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max;
2322 if (has_iops_rd_max) {
2323 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max;
2325 if (has_iops_wr_max) {
2326 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max;
2329 if (has_iops_size) {
2330 cfg.op_size = iops_size;
2333 if (!check_throttle_config(&cfg, errp)) {
2337 if (throttle_enabled(&cfg)) {
2338 /* Enable I/O limits if they're not enabled yet, otherwise
2339 * just update the throttling group. */
2340 if (!bs->io_limits_enabled) {
2341 bdrv_io_limits_enable(bs, has_group ? group : device);
2342 } else if (has_group) {
2343 bdrv_io_limits_update_group(bs, group);
2345 /* Set the new throttling configuration */
2346 bdrv_set_io_limits(bs, &cfg);
2347 } else if (bs->io_limits_enabled) {
2348 /* If all throttling settings are set to 0, disable I/O limits */
2349 bdrv_io_limits_disable(bs);
2353 aio_context_release(aio_context);
2356 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
2357 bool has_granularity, uint32_t granularity,
2360 AioContext *aio_context;
2361 BlockDriverState *bs;
2363 if (!name || name[0] == '\0') {
2364 error_setg(errp, "Bitmap name cannot be empty");
2368 bs = bdrv_lookup_bs(node, node, errp);
2373 aio_context = bdrv_get_aio_context(bs);
2374 aio_context_acquire(aio_context);
2376 if (has_granularity) {
2377 if (granularity < 512 || !is_power_of_2(granularity)) {
2378 error_setg(errp, "Granularity must be power of 2 "
2379 "and at least 512");
2383 /* Default to cluster size, if available: */
2384 granularity = bdrv_get_default_bitmap_granularity(bs);
2387 bdrv_create_dirty_bitmap(bs, granularity, name, errp);
2390 aio_context_release(aio_context);
2393 void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
2396 AioContext *aio_context;
2397 BlockDriverState *bs;
2398 BdrvDirtyBitmap *bitmap;
2400 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2401 if (!bitmap || !bs) {
2405 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2407 "Bitmap '%s' is currently frozen and cannot be removed",
2411 bdrv_dirty_bitmap_make_anon(bitmap);
2412 bdrv_release_dirty_bitmap(bs, bitmap);
2415 aio_context_release(aio_context);
2419 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
2420 * immediately after a full backup operation.
2422 void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
2425 AioContext *aio_context;
2426 BdrvDirtyBitmap *bitmap;
2427 BlockDriverState *bs;
2429 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
2430 if (!bitmap || !bs) {
2434 if (bdrv_dirty_bitmap_frozen(bitmap)) {
2436 "Bitmap '%s' is currently frozen and cannot be modified",
2439 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
2441 "Bitmap '%s' is currently disabled and cannot be cleared",
2446 bdrv_clear_dirty_bitmap(bitmap);
2449 aio_context_release(aio_context);
2452 void hmp_drive_del(Monitor *mon, const QDict *qdict)
2454 const char *id = qdict_get_str(qdict, "id");
2456 BlockDriverState *bs;
2457 AioContext *aio_context;
2458 Error *local_err = NULL;
2460 blk = blk_by_name(id);
2462 error_report("Device '%s' not found", id);
2466 if (!blk_legacy_dinfo(blk)) {
2467 error_report("Deleting device added with blockdev-add"
2468 " is not supported");
2472 aio_context = blk_get_aio_context(blk);
2473 aio_context_acquire(aio_context);
2477 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
2478 error_report_err(local_err);
2479 aio_context_release(aio_context);
2486 /* if we have a device attached to this BlockDriverState
2487 * then we need to make the drive anonymous until the device
2488 * can be removed. If this is a drive with no device backing
2489 * then we can just get rid of the block driver state right here.
2491 if (blk_get_attached_dev(blk)) {
2492 blk_hide_on_behalf_of_hmp_drive_del(blk);
2493 /* Further I/O must not pause the guest */
2494 blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
2495 BLOCKDEV_ON_ERROR_REPORT);
2500 aio_context_release(aio_context);
2503 void qmp_block_resize(bool has_device, const char *device,
2504 bool has_node_name, const char *node_name,
2505 int64_t size, Error **errp)
2507 Error *local_err = NULL;
2508 BlockDriverState *bs;
2509 AioContext *aio_context;
2512 bs = bdrv_lookup_bs(has_device ? device : NULL,
2513 has_node_name ? node_name : NULL,
2516 error_propagate(errp, local_err);
2520 aio_context = bdrv_get_aio_context(bs);
2521 aio_context_acquire(aio_context);
2523 if (!bdrv_is_first_non_filter(bs)) {
2524 error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2529 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2533 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2534 error_setg(errp, QERR_DEVICE_IN_USE, device);
2538 /* complete all in-flight operations before resizing the device */
2541 ret = bdrv_truncate(bs, size);
2546 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2549 error_setg(errp, QERR_UNSUPPORTED);
2552 error_setg(errp, "Device '%s' is read only", device);
2555 error_setg(errp, QERR_DEVICE_IN_USE, device);
2558 error_setg_errno(errp, -ret, "Could not resize");
2563 aio_context_release(aio_context);
2566 static void block_job_cb(void *opaque, int ret)
2568 /* Note that this function may be executed from another AioContext besides
2569 * the QEMU main loop. If you need to access anything that assumes the
2570 * QEMU global mutex, use a BH or introduce a mutex.
2573 BlockDriverState *bs = opaque;
2574 const char *msg = NULL;
2576 trace_block_job_cb(bs, bs->job, ret);
2581 msg = strerror(-ret);
2584 if (block_job_is_cancelled(bs->job)) {
2585 block_job_event_cancelled(bs->job);
2587 block_job_event_completed(bs->job, msg);
2590 bdrv_put_ref_bh_schedule(bs);
2593 void qmp_block_stream(const char *device,
2594 bool has_base, const char *base,
2595 bool has_backing_file, const char *backing_file,
2596 bool has_speed, int64_t speed,
2597 bool has_on_error, BlockdevOnError on_error,
2601 BlockDriverState *bs;
2602 BlockDriverState *base_bs = NULL;
2603 AioContext *aio_context;
2604 Error *local_err = NULL;
2605 const char *base_name = NULL;
2607 if (!has_on_error) {
2608 on_error = BLOCKDEV_ON_ERROR_REPORT;
2611 blk = blk_by_name(device);
2613 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2614 "Device '%s' not found", device);
2618 aio_context = blk_get_aio_context(blk);
2619 aio_context_acquire(aio_context);
2621 if (!blk_is_available(blk)) {
2622 error_setg(errp, "Device '%s' has no medium", device);
2627 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2632 base_bs = bdrv_find_backing_image(bs, base);
2633 if (base_bs == NULL) {
2634 error_setg(errp, QERR_BASE_NOT_FOUND, base);
2637 assert(bdrv_get_aio_context(base_bs) == aio_context);
2641 /* if we are streaming the entire chain, the result will have no backing
2642 * file, and specifying one is therefore an error */
2643 if (base_bs == NULL && has_backing_file) {
2644 error_setg(errp, "backing file specified, but streaming the "
2649 /* backing_file string overrides base bs filename */
2650 base_name = has_backing_file ? backing_file : base_name;
2652 stream_start(bs, base_bs, base_name, has_speed ? speed : 0,
2653 on_error, block_job_cb, bs, &local_err);
2655 error_propagate(errp, local_err);
2659 trace_qmp_block_stream(bs, bs->job);
2662 aio_context_release(aio_context);
2665 void qmp_block_commit(const char *device,
2666 bool has_base, const char *base,
2667 bool has_top, const char *top,
2668 bool has_backing_file, const char *backing_file,
2669 bool has_speed, int64_t speed,
2673 BlockDriverState *bs;
2674 BlockDriverState *base_bs, *top_bs;
2675 AioContext *aio_context;
2676 Error *local_err = NULL;
2677 /* This will be part of the QMP command, if/when the
2678 * BlockdevOnError change for blkmirror makes it in
2680 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2687 * libvirt relies on the DeviceNotFound error class in order to probe for
2688 * live commit feature versions; for this to work, we must make sure to
2689 * perform the device lookup before any generic errors that may occur in a
2690 * scenario in which all optional arguments are omitted. */
2691 blk = blk_by_name(device);
2693 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2694 "Device '%s' not found", device);
2698 aio_context = blk_get_aio_context(blk);
2699 aio_context_acquire(aio_context);
2701 if (!blk_is_available(blk)) {
2702 error_setg(errp, "Device '%s' has no medium", device);
2707 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2711 /* default top_bs is the active layer */
2714 if (has_top && top) {
2715 if (strcmp(bs->filename, top) != 0) {
2716 top_bs = bdrv_find_backing_image(bs, top);
2720 if (top_bs == NULL) {
2721 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2725 assert(bdrv_get_aio_context(top_bs) == aio_context);
2727 if (has_base && base) {
2728 base_bs = bdrv_find_backing_image(top_bs, base);
2730 base_bs = bdrv_find_base(top_bs);
2733 if (base_bs == NULL) {
2734 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2738 assert(bdrv_get_aio_context(base_bs) == aio_context);
2740 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2744 /* Do not allow attempts to commit an image into itself */
2745 if (top_bs == base_bs) {
2746 error_setg(errp, "cannot commit an image into itself");
2751 if (has_backing_file) {
2752 error_setg(errp, "'backing-file' specified,"
2753 " but 'top' is the active layer");
2756 commit_active_start(bs, base_bs, speed, on_error, block_job_cb,
2759 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
2760 has_backing_file ? backing_file : NULL, &local_err);
2762 if (local_err != NULL) {
2763 error_propagate(errp, local_err);
2768 aio_context_release(aio_context);
2771 void qmp_drive_backup(const char *device, const char *target,
2772 bool has_format, const char *format,
2773 enum MirrorSyncMode sync,
2774 bool has_mode, enum NewImageMode mode,
2775 bool has_speed, int64_t speed,
2776 bool has_bitmap, const char *bitmap,
2777 bool has_on_source_error, BlockdevOnError on_source_error,
2778 bool has_on_target_error, BlockdevOnError on_target_error,
2782 BlockDriverState *bs;
2783 BlockDriverState *target_bs;
2784 BlockDriverState *source = NULL;
2785 BdrvDirtyBitmap *bmap = NULL;
2786 AioContext *aio_context;
2787 QDict *options = NULL;
2788 Error *local_err = NULL;
2796 if (!has_on_source_error) {
2797 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2799 if (!has_on_target_error) {
2800 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2803 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
2806 blk = blk_by_name(device);
2808 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2809 "Device '%s' not found", device);
2813 aio_context = blk_get_aio_context(blk);
2814 aio_context_acquire(aio_context);
2816 /* Although backup_run has this check too, we need to use bs->drv below, so
2817 * do an early check redundantly. */
2818 if (!blk_is_available(blk)) {
2819 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2825 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
2828 /* Early check to avoid creating target */
2829 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2833 flags = bs->open_flags | BDRV_O_RDWR;
2835 /* See if we have a backing HD we can use to create our new image
2837 if (sync == MIRROR_SYNC_MODE_TOP) {
2838 source = backing_bs(bs);
2840 sync = MIRROR_SYNC_MODE_FULL;
2843 if (sync == MIRROR_SYNC_MODE_NONE) {
2847 size = bdrv_getlength(bs);
2849 error_setg_errno(errp, -size, "bdrv_getlength failed");
2853 if (mode != NEW_IMAGE_MODE_EXISTING) {
2856 bdrv_img_create(target, format, source->filename,
2857 source->drv->format_name, NULL,
2858 size, flags, &local_err, false);
2860 bdrv_img_create(target, format, NULL, NULL, NULL,
2861 size, flags, &local_err, false);
2866 error_propagate(errp, local_err);
2871 options = qdict_new();
2872 qdict_put(options, "driver", qstring_from_str(format));
2876 ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
2878 error_propagate(errp, local_err);
2882 bdrv_set_aio_context(target_bs, aio_context);
2885 bmap = bdrv_find_dirty_bitmap(bs, bitmap);
2887 error_setg(errp, "Bitmap '%s' could not be found", bitmap);
2892 backup_start(bs, target_bs, speed, sync, bmap,
2893 on_source_error, on_target_error,
2894 block_job_cb, bs, &local_err);
2895 if (local_err != NULL) {
2896 bdrv_unref(target_bs);
2897 error_propagate(errp, local_err);
2902 aio_context_release(aio_context);
2905 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
2907 return bdrv_named_nodes_list(errp);
2910 void qmp_blockdev_backup(const char *device, const char *target,
2911 enum MirrorSyncMode sync,
2912 bool has_speed, int64_t speed,
2913 bool has_on_source_error,
2914 BlockdevOnError on_source_error,
2915 bool has_on_target_error,
2916 BlockdevOnError on_target_error,
2919 BlockBackend *blk, *target_blk;
2920 BlockDriverState *bs;
2921 BlockDriverState *target_bs;
2922 Error *local_err = NULL;
2923 AioContext *aio_context;
2928 if (!has_on_source_error) {
2929 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2931 if (!has_on_target_error) {
2932 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2935 blk = blk_by_name(device);
2937 error_setg(errp, "Device '%s' not found", device);
2941 aio_context = blk_get_aio_context(blk);
2942 aio_context_acquire(aio_context);
2944 if (!blk_is_available(blk)) {
2945 error_setg(errp, "Device '%s' has no medium", device);
2950 target_blk = blk_by_name(target);
2952 error_setg(errp, "Device '%s' not found", target);
2956 if (!blk_is_available(target_blk)) {
2957 error_setg(errp, "Device '%s' has no medium", target);
2960 target_bs = blk_bs(target_blk);
2962 bdrv_ref(target_bs);
2963 bdrv_set_aio_context(target_bs, aio_context);
2964 backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
2965 on_target_error, block_job_cb, bs, &local_err);
2966 if (local_err != NULL) {
2967 bdrv_unref(target_bs);
2968 error_propagate(errp, local_err);
2971 aio_context_release(aio_context);
2974 void qmp_drive_mirror(const char *device, const char *target,
2975 bool has_format, const char *format,
2976 bool has_node_name, const char *node_name,
2977 bool has_replaces, const char *replaces,
2978 enum MirrorSyncMode sync,
2979 bool has_mode, enum NewImageMode mode,
2980 bool has_speed, int64_t speed,
2981 bool has_granularity, uint32_t granularity,
2982 bool has_buf_size, int64_t buf_size,
2983 bool has_on_source_error, BlockdevOnError on_source_error,
2984 bool has_on_target_error, BlockdevOnError on_target_error,
2985 bool has_unmap, bool unmap,
2989 BlockDriverState *bs;
2990 BlockDriverState *source, *target_bs;
2991 AioContext *aio_context;
2992 Error *local_err = NULL;
3001 if (!has_on_source_error) {
3002 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
3004 if (!has_on_target_error) {
3005 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
3008 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3010 if (!has_granularity) {
3013 if (!has_buf_size) {
3020 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
3021 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3022 "a value in range [512B, 64MB]");
3025 if (granularity & (granularity - 1)) {
3026 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
3031 blk = blk_by_name(device);
3033 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3034 "Device '%s' not found", device);
3038 aio_context = blk_get_aio_context(blk);
3039 aio_context_acquire(aio_context);
3041 if (!blk_is_available(blk)) {
3042 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
3048 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
3051 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
3055 flags = bs->open_flags | BDRV_O_RDWR;
3056 source = backing_bs(bs);
3057 if (!source && sync == MIRROR_SYNC_MODE_TOP) {
3058 sync = MIRROR_SYNC_MODE_FULL;
3060 if (sync == MIRROR_SYNC_MODE_NONE) {
3064 size = bdrv_getlength(bs);
3066 error_setg_errno(errp, -size, "bdrv_getlength failed");
3071 BlockDriverState *to_replace_bs;
3072 AioContext *replace_aio_context;
3073 int64_t replace_size;
3075 if (!has_node_name) {
3076 error_setg(errp, "a node-name must be provided when replacing a"
3077 " named node of the graph");
3081 to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
3083 if (!to_replace_bs) {
3084 error_propagate(errp, local_err);
3088 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3089 aio_context_acquire(replace_aio_context);
3090 replace_size = bdrv_getlength(to_replace_bs);
3091 aio_context_release(replace_aio_context);
3093 if (size != replace_size) {
3094 error_setg(errp, "cannot replace image with a mirror image of "
3100 if ((sync == MIRROR_SYNC_MODE_FULL || !source)
3101 && mode != NEW_IMAGE_MODE_EXISTING)
3103 /* create new image w/o backing file */
3105 bdrv_img_create(target, format,
3106 NULL, NULL, NULL, size, flags, &local_err, false);
3109 case NEW_IMAGE_MODE_EXISTING:
3111 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3112 /* create new image with backing file */
3113 bdrv_img_create(target, format,
3115 source->drv->format_name,
3116 NULL, size, flags, &local_err, false);
3124 error_propagate(errp, local_err);
3128 options = qdict_new();
3129 if (has_node_name) {
3130 qdict_put(options, "node-name", qstring_from_str(node_name));
3133 qdict_put(options, "driver", qstring_from_str(format));
3136 /* Mirroring takes care of copy-on-write using the source's backing
3140 ret = bdrv_open(&target_bs, target, NULL, options,
3141 flags | BDRV_O_NO_BACKING, &local_err);
3143 error_propagate(errp, local_err);
3147 bdrv_set_aio_context(target_bs, aio_context);
3149 /* pass the node name to replace to mirror start since it's loose coupling
3150 * and will allow to check whether the node still exist at mirror completion
3152 mirror_start(bs, target_bs,
3153 has_replaces ? replaces : NULL,
3154 speed, granularity, buf_size, sync,
3155 on_source_error, on_target_error,
3157 block_job_cb, bs, &local_err);
3158 if (local_err != NULL) {
3159 bdrv_unref(target_bs);
3160 error_propagate(errp, local_err);
3165 aio_context_release(aio_context);
3168 /* Get the block job for a given device name and acquire its AioContext */
3169 static BlockJob *find_block_job(const char *device, AioContext **aio_context,
3173 BlockDriverState *bs;
3175 *aio_context = NULL;
3177 blk = blk_by_name(device);
3182 *aio_context = blk_get_aio_context(blk);
3183 aio_context_acquire(*aio_context);
3185 if (!blk_is_available(blk)) {
3197 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3198 "No active block job on device '%s'", device);
3200 aio_context_release(*aio_context);
3201 *aio_context = NULL;
3206 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3208 AioContext *aio_context;
3209 BlockJob *job = find_block_job(device, &aio_context, errp);
3215 block_job_set_speed(job, speed, errp);
3216 aio_context_release(aio_context);
3219 void qmp_block_job_cancel(const char *device,
3220 bool has_force, bool force, Error **errp)
3222 AioContext *aio_context;
3223 BlockJob *job = find_block_job(device, &aio_context, errp);
3233 if (job->user_paused && !force) {
3234 error_setg(errp, "The block job for device '%s' is currently paused",
3239 trace_qmp_block_job_cancel(job);
3240 block_job_cancel(job);
3242 aio_context_release(aio_context);
3245 void qmp_block_job_pause(const char *device, Error **errp)
3247 AioContext *aio_context;
3248 BlockJob *job = find_block_job(device, &aio_context, errp);
3250 if (!job || job->user_paused) {
3254 job->user_paused = true;
3255 trace_qmp_block_job_pause(job);
3256 block_job_pause(job);
3257 aio_context_release(aio_context);
3260 void qmp_block_job_resume(const char *device, Error **errp)
3262 AioContext *aio_context;
3263 BlockJob *job = find_block_job(device, &aio_context, errp);
3265 if (!job || !job->user_paused) {
3269 job->user_paused = false;
3270 trace_qmp_block_job_resume(job);
3271 block_job_resume(job);
3272 aio_context_release(aio_context);
3275 void qmp_block_job_complete(const char *device, Error **errp)
3277 AioContext *aio_context;
3278 BlockJob *job = find_block_job(device, &aio_context, errp);
3284 trace_qmp_block_job_complete(job);
3285 block_job_complete(job, errp);
3286 aio_context_release(aio_context);
3289 void qmp_change_backing_file(const char *device,
3290 const char *image_node_name,
3291 const char *backing_file,
3295 BlockDriverState *bs = NULL;
3296 AioContext *aio_context;
3297 BlockDriverState *image_bs = NULL;
3298 Error *local_err = NULL;
3303 blk = blk_by_name(device);
3305 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
3306 "Device '%s' not found", device);
3310 aio_context = blk_get_aio_context(blk);
3311 aio_context_acquire(aio_context);
3313 if (!blk_is_available(blk)) {
3314 error_setg(errp, "Device '%s' has no medium", device);
3319 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3321 error_propagate(errp, local_err);
3326 error_setg(errp, "image file not found");
3330 if (bdrv_find_base(image_bs) == image_bs) {
3331 error_setg(errp, "not allowing backing file change on an image "
3332 "without a backing file");
3336 /* even though we are not necessarily operating on bs, we need it to
3337 * determine if block ops are currently prohibited on the chain */
3338 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3342 /* final sanity check */
3343 if (!bdrv_chain_contains(bs, image_bs)) {
3344 error_setg(errp, "'%s' and image file are not in the same chain",
3349 /* if not r/w, reopen to make r/w */
3350 open_flags = image_bs->open_flags;
3351 ro = bdrv_is_read_only(image_bs);
3354 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err);
3356 error_propagate(errp, local_err);
3361 ret = bdrv_change_backing_file(image_bs, backing_file,
3362 image_bs->drv ? image_bs->drv->format_name : "");
3365 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3367 /* don't exit here, so we can try to restore open flags if
3372 bdrv_reopen(image_bs, open_flags, &local_err);
3374 error_propagate(errp, local_err); /* will preserve prior errp */
3379 aio_context_release(aio_context);
3382 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3384 QmpOutputVisitor *ov = qmp_output_visitor_new();
3385 BlockDriverState *bs;
3386 BlockBackend *blk = NULL;
3389 Error *local_err = NULL;
3391 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
3392 * cache.direct=false instead of silently switching to aio=threads, except
3393 * when called from drive_new().
3395 * For now, simply forbidding the combination for all drivers will do. */
3396 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3397 bool direct = options->has_cache &&
3398 options->cache->has_direct &&
3399 options->cache->direct;
3401 error_setg(errp, "aio=native requires cache.direct=true");
3406 visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
3407 &options, NULL, &local_err);
3409 error_propagate(errp, local_err);
3413 obj = qmp_output_get_qobject(ov);
3414 qdict = qobject_to_qdict(obj);
3416 qdict_flatten(qdict);
3418 if (options->has_id) {
3419 blk = blockdev_init(NULL, qdict, &local_err);
3421 error_propagate(errp, local_err);
3427 if (!qdict_get_try_str(qdict, "node-name")) {
3428 error_setg(errp, "'id' and/or 'node-name' need to be specified for "
3433 bs = bds_tree_init(qdict, errp);
3439 if (bs && bdrv_key_required(bs)) {
3445 error_setg(errp, "blockdev-add doesn't support encrypted devices");
3450 qmp_output_visitor_cleanup(ov);
3453 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3455 BlockJobInfoList *head = NULL, **p_next = &head;
3456 BlockDriverState *bs;
3458 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3459 AioContext *aio_context = bdrv_get_aio_context(bs);
3461 aio_context_acquire(aio_context);
3464 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
3465 elem->value = block_job_query(bs->job);
3467 p_next = &elem->next;
3470 aio_context_release(aio_context);
3476 QemuOptsList qemu_common_drive_opts = {
3478 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3482 .type = QEMU_OPT_BOOL,
3483 .help = "enable/disable snapshot mode",
3486 .type = QEMU_OPT_STRING,
3487 .help = "discard operation (ignore/off, unmap/on)",
3489 .name = BDRV_OPT_CACHE_WB,
3490 .type = QEMU_OPT_BOOL,
3491 .help = "enables writeback mode for any caches",
3493 .name = BDRV_OPT_CACHE_DIRECT,
3494 .type = QEMU_OPT_BOOL,
3495 .help = "enables use of O_DIRECT (bypass the host page cache)",
3497 .name = BDRV_OPT_CACHE_NO_FLUSH,
3498 .type = QEMU_OPT_BOOL,
3499 .help = "ignore any flush requests for the device",
3502 .type = QEMU_OPT_STRING,
3503 .help = "host AIO implementation (threads, native)",
3506 .type = QEMU_OPT_STRING,
3507 .help = "disk format (raw, qcow2, ...)",
3510 .type = QEMU_OPT_STRING,
3511 .help = "read error action",
3514 .type = QEMU_OPT_STRING,
3515 .help = "write error action",
3517 .name = "read-only",
3518 .type = QEMU_OPT_BOOL,
3519 .help = "open drive file as read-only",
3521 .name = "throttling.iops-total",
3522 .type = QEMU_OPT_NUMBER,
3523 .help = "limit total I/O operations per second",
3525 .name = "throttling.iops-read",
3526 .type = QEMU_OPT_NUMBER,
3527 .help = "limit read operations per second",
3529 .name = "throttling.iops-write",
3530 .type = QEMU_OPT_NUMBER,
3531 .help = "limit write operations per second",
3533 .name = "throttling.bps-total",
3534 .type = QEMU_OPT_NUMBER,
3535 .help = "limit total bytes per second",
3537 .name = "throttling.bps-read",
3538 .type = QEMU_OPT_NUMBER,
3539 .help = "limit read bytes per second",
3541 .name = "throttling.bps-write",
3542 .type = QEMU_OPT_NUMBER,
3543 .help = "limit write bytes per second",
3545 .name = "throttling.iops-total-max",
3546 .type = QEMU_OPT_NUMBER,
3547 .help = "I/O operations burst",
3549 .name = "throttling.iops-read-max",
3550 .type = QEMU_OPT_NUMBER,
3551 .help = "I/O operations read burst",
3553 .name = "throttling.iops-write-max",
3554 .type = QEMU_OPT_NUMBER,
3555 .help = "I/O operations write burst",
3557 .name = "throttling.bps-total-max",
3558 .type = QEMU_OPT_NUMBER,
3559 .help = "total bytes burst",
3561 .name = "throttling.bps-read-max",
3562 .type = QEMU_OPT_NUMBER,
3563 .help = "total bytes read burst",
3565 .name = "throttling.bps-write-max",
3566 .type = QEMU_OPT_NUMBER,
3567 .help = "total bytes write burst",
3569 .name = "throttling.iops-size",
3570 .type = QEMU_OPT_NUMBER,
3571 .help = "when limiting by iops max size of an I/O in bytes",
3573 .name = "throttling.group",
3574 .type = QEMU_OPT_STRING,
3575 .help = "name of the block throttling group",
3577 .name = "copy-on-read",
3578 .type = QEMU_OPT_BOOL,
3579 .help = "copy read data from backing file into image file",
3581 .name = "detect-zeroes",
3582 .type = QEMU_OPT_STRING,
3583 .help = "try to optimize zero writes (off, on, unmap)",
3585 { /* end of list */ }
3589 static QemuOptsList qemu_root_bds_opts = {
3591 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3595 .type = QEMU_OPT_STRING,
3596 .help = "discard operation (ignore/off, unmap/on)",
3598 .name = "cache.writeback",
3599 .type = QEMU_OPT_BOOL,
3600 .help = "enables writeback mode for any caches",
3602 .name = "cache.direct",
3603 .type = QEMU_OPT_BOOL,
3604 .help = "enables use of O_DIRECT (bypass the host page cache)",
3606 .name = "cache.no-flush",
3607 .type = QEMU_OPT_BOOL,
3608 .help = "ignore any flush requests for the device",
3611 .type = QEMU_OPT_STRING,
3612 .help = "host AIO implementation (threads, native)",
3614 .name = "read-only",
3615 .type = QEMU_OPT_BOOL,
3616 .help = "open drive file as read-only",
3618 .name = "copy-on-read",
3619 .type = QEMU_OPT_BOOL,
3620 .help = "copy read data from backing file into image file",
3622 .name = "detect-zeroes",
3623 .type = QEMU_OPT_STRING,
3624 .help = "try to optimize zero writes (off, on, unmap)",
3626 { /* end of list */ }
3630 QemuOptsList qemu_drive_opts = {
3632 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3635 * no elements => accept any params
3636 * validation will happen later
3638 { /* end of list */ }