| /* |
| * QEMU host block devices |
| * |
| * Copyright (c) 2003-2008 Fabrice Bellard |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or |
| * later. See the COPYING file in the top-level directory. |
| * |
| * This file incorporates work covered by the following copyright and |
| * permission notice: |
| * |
| * Copyright (c) 2003-2008 Fabrice Bellard |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "sysemu/block-backend.h" |
| #include "sysemu/blockdev.h" |
| #include "hw/block/block.h" |
| #include "block/blockjob.h" |
| #include "block/qdict.h" |
| #include "block/throttle-groups.h" |
| #include "monitor/monitor.h" |
| #include "qemu/error-report.h" |
| #include "qemu/option.h" |
| #include "qemu/qemu-print.h" |
| #include "qemu/config-file.h" |
| #include "qapi/qapi-commands-block.h" |
| #include "qapi/qapi-commands-transaction.h" |
| #include "qapi/qapi-visit-block-core.h" |
| #include "qapi/qmp/qdict.h" |
| #include "qapi/qmp/qnum.h" |
| #include "qapi/qmp/qstring.h" |
| #include "qapi/error.h" |
| #include "qapi/qmp/qerror.h" |
| #include "qapi/qmp/qlist.h" |
| #include "qapi/qobject-output-visitor.h" |
| #include "sysemu/sysemu.h" |
| #include "sysemu/iothread.h" |
| #include "block/block_int.h" |
| #include "block/trace.h" |
| #include "sysemu/arch_init.h" |
| #include "sysemu/runstate.h" |
| #include "sysemu/replay.h" |
| #include "qemu/cutils.h" |
| #include "qemu/help_option.h" |
| #include "qemu/main-loop.h" |
| #include "qemu/throttle-options.h" |
| |
| QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states = |
| QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states); |
| |
| void bdrv_set_monitor_owned(BlockDriverState *bs) |
| { |
| QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list); |
| } |
| |
| static const char *const if_name[IF_COUNT] = { |
| [IF_NONE] = "none", |
| [IF_IDE] = "ide", |
| [IF_SCSI] = "scsi", |
| [IF_FLOPPY] = "floppy", |
| [IF_PFLASH] = "pflash", |
| [IF_MTD] = "mtd", |
| [IF_SD] = "sd", |
| [IF_VIRTIO] = "virtio", |
| [IF_XEN] = "xen", |
| }; |
| |
| static int if_max_devs[IF_COUNT] = { |
| /* |
| * Do not change these numbers! They govern how drive option |
| * index maps to unit and bus. That mapping is ABI. |
| * |
| * All controllers used to implement if=T drives need to support |
| * if_max_devs[T] units, for any T with if_max_devs[T] != 0. |
| * Otherwise, some index values map to "impossible" bus, unit |
| * values. |
| * |
| * For instance, if you change [IF_SCSI] to 255, -drive |
| * if=scsi,index=12 no longer means bus=1,unit=5, but |
| * bus=0,unit=12. With an lsi53c895a controller (7 units max), |
| * the drive can't be set up. Regression. |
| */ |
| [IF_IDE] = 2, |
| [IF_SCSI] = 7, |
| }; |
| |
| /** |
| * Boards may call this to offer board-by-board overrides |
| * of the default, global values. |
| */ |
| void override_max_devs(BlockInterfaceType type, int max_devs) |
| { |
| BlockBackend *blk; |
| DriveInfo *dinfo; |
| |
| if (max_devs <= 0) { |
| return; |
| } |
| |
| for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { |
| dinfo = blk_legacy_dinfo(blk); |
| if (dinfo->type == type) { |
| fprintf(stderr, "Cannot override units-per-bus property of" |
| " the %s interface, because a drive of that type has" |
| " already been added.\n", if_name[type]); |
| g_assert_not_reached(); |
| } |
| } |
| |
| if_max_devs[type] = max_devs; |
| } |
| |
| /* |
| * We automatically delete the drive when a device using it gets |
| * unplugged. Questionable feature, but we can't just drop it. |
| * Device models call blockdev_mark_auto_del() to schedule the |
| * automatic deletion, and generic qdev code calls blockdev_auto_del() |
| * when deletion is actually safe. |
| */ |
| void blockdev_mark_auto_del(BlockBackend *blk) |
| { |
| DriveInfo *dinfo = blk_legacy_dinfo(blk); |
| BlockJob *job; |
| |
| if (!dinfo) { |
| return; |
| } |
| |
| for (job = block_job_next(NULL); job; job = block_job_next(job)) { |
| if (block_job_has_bdrv(job, blk_bs(blk))) { |
| AioContext *aio_context = job->job.aio_context; |
| aio_context_acquire(aio_context); |
| |
| job_cancel(&job->job, false); |
| |
| aio_context_release(aio_context); |
| } |
| } |
| |
| dinfo->auto_del = 1; |
| } |
| |
| void blockdev_auto_del(BlockBackend *blk) |
| { |
| DriveInfo *dinfo = blk_legacy_dinfo(blk); |
| |
| if (dinfo && dinfo->auto_del) { |
| monitor_remove_blk(blk); |
| blk_unref(blk); |
| } |
| } |
| |
| /** |
| * Returns the current mapping of how many units per bus |
| * a particular interface can support. |
| * |
| * A positive integer indicates n units per bus. |
| * 0 implies the mapping has not been established. |
| * -1 indicates an invalid BlockInterfaceType was given. |
| */ |
| int drive_get_max_devs(BlockInterfaceType type) |
| { |
| if (type >= IF_IDE && type < IF_COUNT) { |
| return if_max_devs[type]; |
| } |
| |
| return -1; |
| } |
| |
| static int drive_index_to_bus_id(BlockInterfaceType type, int index) |
| { |
| int max_devs = if_max_devs[type]; |
| return max_devs ? index / max_devs : 0; |
| } |
| |
| static int drive_index_to_unit_id(BlockInterfaceType type, int index) |
| { |
| int max_devs = if_max_devs[type]; |
| return max_devs ? index % max_devs : index; |
| } |
| |
| QemuOpts *drive_def(const char *optstr) |
| { |
| return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); |
| } |
| |
| QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, |
| const char *optstr) |
| { |
| QemuOpts *opts; |
| |
| opts = drive_def(optstr); |
| if (!opts) { |
| return NULL; |
| } |
| if (type != IF_DEFAULT) { |
| qemu_opt_set(opts, "if", if_name[type], &error_abort); |
| } |
| if (index >= 0) { |
| qemu_opt_set_number(opts, "index", index, &error_abort); |
| } |
| if (file) |
| qemu_opt_set(opts, "file", file, &error_abort); |
| return opts; |
| } |
| |
| DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) |
| { |
| BlockBackend *blk; |
| DriveInfo *dinfo; |
| |
| for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { |
| dinfo = blk_legacy_dinfo(blk); |
| if (dinfo && dinfo->type == type |
| && dinfo->bus == bus && dinfo->unit == unit) { |
| return dinfo; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| /* |
| * Check board claimed all -drive that are meant to be claimed. |
| * Fatal error if any remain unclaimed. |
| */ |
| void drive_check_orphaned(void) |
| { |
| BlockBackend *blk; |
| DriveInfo *dinfo; |
| Location loc; |
| bool orphans = false; |
| |
| for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { |
| dinfo = blk_legacy_dinfo(blk); |
| /* |
| * Ignore default drives, because we create certain default |
| * drives unconditionally, then leave them unclaimed. Not the |
| * users fault. |
| * Ignore IF_VIRTIO, because it gets desugared into -device, |
| * so we can leave failing to -device. |
| * Ignore IF_NONE, because leaving unclaimed IF_NONE remains |
| * available for device_add is a feature. |
| */ |
| if (dinfo->is_default || dinfo->type == IF_VIRTIO |
| || dinfo->type == IF_NONE) { |
| continue; |
| } |
| if (!blk_get_attached_dev(blk)) { |
| loc_push_none(&loc); |
| qemu_opts_loc_restore(dinfo->opts); |
| error_report("machine type does not support" |
| " if=%s,bus=%d,unit=%d", |
| if_name[dinfo->type], dinfo->bus, dinfo->unit); |
| loc_pop(&loc); |
| orphans = true; |
| } |
| } |
| |
| if (orphans) { |
| exit(1); |
| } |
| } |
| |
| DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) |
| { |
| return drive_get(type, |
| drive_index_to_bus_id(type, index), |
| drive_index_to_unit_id(type, index)); |
| } |
| |
| int drive_get_max_bus(BlockInterfaceType type) |
| { |
| int max_bus; |
| BlockBackend *blk; |
| DriveInfo *dinfo; |
| |
| max_bus = -1; |
| for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { |
| dinfo = blk_legacy_dinfo(blk); |
| if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { |
| max_bus = dinfo->bus; |
| } |
| } |
| return max_bus; |
| } |
| |
| /* Get a block device. This should only be used for single-drive devices |
| (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the |
| appropriate bus. */ |
| DriveInfo *drive_get_next(BlockInterfaceType type) |
| { |
| static int next_block_unit[IF_COUNT]; |
| |
| return drive_get(type, 0, next_block_unit[type]++); |
| } |
| |
| static void bdrv_format_print(void *opaque, const char *name) |
| { |
| qemu_printf(" %s", name); |
| } |
| |
| typedef struct { |
| QEMUBH *bh; |
| BlockDriverState *bs; |
| } BDRVPutRefBH; |
| |
| static int parse_block_error_action(const char *buf, bool is_read, Error **errp) |
| { |
| if (!strcmp(buf, "ignore")) { |
| return BLOCKDEV_ON_ERROR_IGNORE; |
| } else if (!is_read && !strcmp(buf, "enospc")) { |
| return BLOCKDEV_ON_ERROR_ENOSPC; |
| } else if (!strcmp(buf, "stop")) { |
| return BLOCKDEV_ON_ERROR_STOP; |
| } else if (!strcmp(buf, "report")) { |
| return BLOCKDEV_ON_ERROR_REPORT; |
| } else { |
| error_setg(errp, "'%s' invalid %s error action", |
| buf, is_read ? "read" : "write"); |
| return -1; |
| } |
| } |
| |
| static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals, |
| Error **errp) |
| { |
| const QListEntry *entry; |
| for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) { |
| switch (qobject_type(entry->value)) { |
| |
| case QTYPE_QSTRING: { |
| unsigned long long length; |
| const char *str = qstring_get_str(qobject_to(QString, |
| entry->value)); |
| if (parse_uint_full(str, &length, 10) == 0 && |
| length > 0 && length <= UINT_MAX) { |
| block_acct_add_interval(stats, (unsigned) length); |
| } else { |
| error_setg(errp, "Invalid interval length: %s", str); |
| return false; |
| } |
| break; |
| } |
| |
| case QTYPE_QNUM: { |
| int64_t length = qnum_get_int(qobject_to(QNum, entry->value)); |
| |
| if (length > 0 && length <= UINT_MAX) { |
| block_acct_add_interval(stats, (unsigned) length); |
| } else { |
| error_setg(errp, "Invalid interval length: %" PRId64, length); |
| return false; |
| } |
| break; |
| } |
| |
| default: |
| error_setg(errp, "The specification of stats-intervals is invalid"); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; |
| |
| /* All parameters but @opts are optional and may be set to NULL. */ |
| static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags, |
| const char **throttling_group, ThrottleConfig *throttle_cfg, |
| BlockdevDetectZeroesOptions *detect_zeroes, Error **errp) |
| { |
| Error *local_error = NULL; |
| const char *aio; |
| |
| if (bdrv_flags) { |
| if (qemu_opt_get_bool(opts, "copy-on-read", false)) { |
| *bdrv_flags |= BDRV_O_COPY_ON_READ; |
| } |
| |
| if ((aio = qemu_opt_get(opts, "aio")) != NULL) { |
| if (bdrv_parse_aio(aio, bdrv_flags) < 0) { |
| error_setg(errp, "invalid aio option"); |
| return; |
| } |
| } |
| } |
| |
| /* disk I/O throttling */ |
| if (throttling_group) { |
| *throttling_group = qemu_opt_get(opts, "throttling.group"); |
| } |
| |
| if (throttle_cfg) { |
| throttle_config_init(throttle_cfg); |
| throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg = |
| qemu_opt_get_number(opts, "throttling.bps-total", 0); |
| throttle_cfg->buckets[THROTTLE_BPS_READ].avg = |
| qemu_opt_get_number(opts, "throttling.bps-read", 0); |
| throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg = |
| qemu_opt_get_number(opts, "throttling.bps-write", 0); |
| throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg = |
| qemu_opt_get_number(opts, "throttling.iops-total", 0); |
| throttle_cfg->buckets[THROTTLE_OPS_READ].avg = |
| qemu_opt_get_number(opts, "throttling.iops-read", 0); |
| throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg = |
| qemu_opt_get_number(opts, "throttling.iops-write", 0); |
| |
| throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max = |
| qemu_opt_get_number(opts, "throttling.bps-total-max", 0); |
| throttle_cfg->buckets[THROTTLE_BPS_READ].max = |
| qemu_opt_get_number(opts, "throttling.bps-read-max", 0); |
| throttle_cfg->buckets[THROTTLE_BPS_WRITE].max = |
| qemu_opt_get_number(opts, "throttling.bps-write-max", 0); |
| throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max = |
| qemu_opt_get_number(opts, "throttling.iops-total-max", 0); |
| throttle_cfg->buckets[THROTTLE_OPS_READ].max = |
| qemu_opt_get_number(opts, "throttling.iops-read-max", 0); |
| throttle_cfg->buckets[THROTTLE_OPS_WRITE].max = |
| qemu_opt_get_number(opts, "throttling.iops-write-max", 0); |
| |
| throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length = |
| qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1); |
| throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length = |
| qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1); |
| throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length = |
| qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1); |
| throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length = |
| qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1); |
| throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length = |
| qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1); |
| throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length = |
| qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1); |
| |
| throttle_cfg->op_size = |
| qemu_opt_get_number(opts, "throttling.iops-size", 0); |
| |
| if (!throttle_is_valid(throttle_cfg, errp)) { |
| return; |
| } |
| } |
| |
| if (detect_zeroes) { |
| *detect_zeroes = |
| qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, |
| qemu_opt_get(opts, "detect-zeroes"), |
| BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, |
| &local_error); |
| if (local_error) { |
| error_propagate(errp, local_error); |
| return; |
| } |
| } |
| } |
| |
| /* Takes the ownership of bs_opts */ |
| static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, |
| Error **errp) |
| { |
| const char *buf; |
| int bdrv_flags = 0; |
| int on_read_error, on_write_error; |
| bool account_invalid, account_failed; |
| bool writethrough, read_only; |
| BlockBackend *blk; |
| BlockDriverState *bs; |
| ThrottleConfig cfg; |
| int snapshot = 0; |
| Error *error = NULL; |
| QemuOpts *opts; |
| QDict *interval_dict = NULL; |
| QList *interval_list = NULL; |
| const char *id; |
| BlockdevDetectZeroesOptions detect_zeroes = |
| BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; |
| const char *throttling_group = NULL; |
| |
| /* Check common options by copying from bs_opts to opts, all other options |
| * stay in bs_opts for processing by bdrv_open(). */ |
| id = qdict_get_try_str(bs_opts, "id"); |
| opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, errp); |
| if (!opts) { |
| goto err_no_opts; |
| } |
| |
| if (!qemu_opts_absorb_qdict(opts, bs_opts, errp)) { |
| goto early_err; |
| } |
| |
| if (id) { |
| qdict_del(bs_opts, "id"); |
| } |
| |
| /* extract parameters */ |
| snapshot = qemu_opt_get_bool(opts, "snapshot", 0); |
| |
| account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true); |
| account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true); |
| |
| writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true); |
| |
| id = qemu_opts_id(opts); |
| |
| qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals."); |
| qdict_array_split(interval_dict, &interval_list); |
| |
| if (qdict_size(interval_dict) != 0) { |
| error_setg(errp, "Invalid option stats-intervals.%s", |
| qdict_first(interval_dict)->key); |
| goto early_err; |
| } |
| |
| extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg, |
| &detect_zeroes, &error); |
| if (error) { |
| error_propagate(errp, error); |
| goto early_err; |
| } |
| |
| if ((buf = qemu_opt_get(opts, "format")) != NULL) { |
| if (is_help_option(buf)) { |
| qemu_printf("Supported formats:"); |
| bdrv_iterate_format(bdrv_format_print, NULL, false); |
| qemu_printf("\nSupported formats (read-only):"); |
| bdrv_iterate_format(bdrv_format_print, NULL, true); |
| qemu_printf("\n"); |
| goto early_err; |
| } |
| |
| if (qdict_haskey(bs_opts, "driver")) { |
| error_setg(errp, "Cannot specify both 'driver' and 'format'"); |
| goto early_err; |
| } |
| qdict_put_str(bs_opts, "driver", buf); |
| } |
| |
| on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; |
| if ((buf = qemu_opt_get(opts, "werror")) != NULL) { |
| on_write_error = parse_block_error_action(buf, 0, &error); |
| if (error) { |
| error_propagate(errp, error); |
| goto early_err; |
| } |
| } |
| |
| on_read_error = BLOCKDEV_ON_ERROR_REPORT; |
| if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { |
| on_read_error = parse_block_error_action(buf, 1, &error); |
| if (error) { |
| error_propagate(errp, error); |
| goto early_err; |
| } |
| } |
| |
| if (snapshot) { |
| bdrv_flags |= BDRV_O_SNAPSHOT; |
| } |
| |
| read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false); |
| |
| /* init */ |
| if ((!file || !*file) && !qdict_size(bs_opts)) { |
| BlockBackendRootState *blk_rs; |
| |
| blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL); |
| blk_rs = blk_get_root_state(blk); |
| blk_rs->open_flags = bdrv_flags; |
| blk_rs->read_only = read_only; |
| blk_rs->detect_zeroes = detect_zeroes; |
| |
| qobject_unref(bs_opts); |
| } else { |
| if (file && !*file) { |
| file = NULL; |
| } |
| |
| /* bdrv_open() defaults to the values in bdrv_flags (for compatibility |
| * with other callers) rather than what we want as the real defaults. |
| * Apply the defaults here instead. */ |
| qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); |
| qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); |
| qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, |
| read_only ? "on" : "off"); |
| qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on"); |
| assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0); |
| |
| if (runstate_check(RUN_STATE_INMIGRATE)) { |
| bdrv_flags |= BDRV_O_INACTIVE; |
| } |
| |
| blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp); |
| if (!blk) { |
| goto err_no_bs_opts; |
| } |
| bs = blk_bs(blk); |
| |
| bs->detect_zeroes = detect_zeroes; |
| |
| block_acct_setup(blk_get_stats(blk), account_invalid, account_failed); |
| |
| if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) { |
| blk_unref(blk); |
| blk = NULL; |
| goto err_no_bs_opts; |
| } |
| } |
| |
| /* disk I/O throttling */ |
| if (throttle_enabled(&cfg)) { |
| if (!throttling_group) { |
| throttling_group = id; |
| } |
| blk_io_limits_enable(blk, throttling_group); |
| blk_set_io_limits(blk, &cfg); |
| } |
| |
| blk_set_enable_write_cache(blk, !writethrough); |
| blk_set_on_error(blk, on_read_error, on_write_error); |
| |
| if (!monitor_add_blk(blk, id, errp)) { |
| blk_unref(blk); |
| blk = NULL; |
| goto err_no_bs_opts; |
| } |
| |
| err_no_bs_opts: |
| qemu_opts_del(opts); |
| qobject_unref(interval_dict); |
| qobject_unref(interval_list); |
| return blk; |
| |
| early_err: |
| qemu_opts_del(opts); |
| qobject_unref(interval_dict); |
| qobject_unref(interval_list); |
| err_no_opts: |
| qobject_unref(bs_opts); |
| return NULL; |
| } |
| |
| /* Takes the ownership of bs_opts */ |
| BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp) |
| { |
| int bdrv_flags = 0; |
| |
| /* bdrv_open() defaults to the values in bdrv_flags (for compatibility |
| * with other callers) rather than what we want as the real defaults. |
| * Apply the defaults here instead. */ |
| qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off"); |
| qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off"); |
| qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off"); |
| |
| if (runstate_check(RUN_STATE_INMIGRATE)) { |
| bdrv_flags |= BDRV_O_INACTIVE; |
| } |
| |
| return bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp); |
| } |
| |
| void blockdev_close_all_bdrv_states(void) |
| { |
| BlockDriverState *bs, *next_bs; |
| |
| QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) { |
| AioContext *ctx = bdrv_get_aio_context(bs); |
| |
| aio_context_acquire(ctx); |
| bdrv_unref(bs); |
| aio_context_release(ctx); |
| } |
| } |
| |
| /* Iterates over the list of monitor-owned BlockDriverStates */ |
| BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs) |
| { |
| return bs ? QTAILQ_NEXT(bs, monitor_list) |
| : QTAILQ_FIRST(&monitor_bdrv_states); |
| } |
| |
| static bool qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, |
| Error **errp) |
| { |
| const char *value; |
| |
| value = qemu_opt_get(opts, from); |
| if (value) { |
| if (qemu_opt_find(opts, to)) { |
| error_setg(errp, "'%s' and its alias '%s' can't be used at the " |
| "same time", to, from); |
| return false; |
| } |
| } |
| |
| /* rename all items in opts */ |
| while ((value = qemu_opt_get(opts, from))) { |
| qemu_opt_set(opts, to, value, &error_abort); |
| qemu_opt_unset(opts, from); |
| } |
| return true; |
| } |
| |
| QemuOptsList qemu_legacy_drive_opts = { |
| .name = "drive", |
| .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), |
| .desc = { |
| { |
| .name = "bus", |
| .type = QEMU_OPT_NUMBER, |
| .help = "bus number", |
| },{ |
| .name = "unit", |
| .type = QEMU_OPT_NUMBER, |
| .help = "unit number (i.e. lun for scsi)", |
| },{ |
| .name = "index", |
| .type = QEMU_OPT_NUMBER, |
| .help = "index number", |
| },{ |
| .name = "media", |
| .type = QEMU_OPT_STRING, |
| .help = "media type (disk, cdrom)", |
| },{ |
| .name = "if", |
| .type = QEMU_OPT_STRING, |
| .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", |
| },{ |
| .name = "file", |
| .type = QEMU_OPT_STRING, |
| .help = "file name", |
| }, |
| |
| /* Options that are passed on, but have special semantics with -drive */ |
| { |
| .name = BDRV_OPT_READ_ONLY, |
| .type = QEMU_OPT_BOOL, |
| .help = "open drive file as read-only", |
| },{ |
| .name = "rerror", |
| .type = QEMU_OPT_STRING, |
| .help = "read error action", |
| },{ |
| .name = "werror", |
| .type = QEMU_OPT_STRING, |
| .help = "write error action", |
| },{ |
| .name = "copy-on-read", |
| .type = QEMU_OPT_BOOL, |
| .help = "copy read data from backing file into image file", |
| }, |
| |
| { /* end of list */ } |
| }, |
| }; |
| |
| DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type, |
| Error **errp) |
| { |
| const char *value; |
| BlockBackend *blk; |
| DriveInfo *dinfo = NULL; |
| QDict *bs_opts; |
| QemuOpts *legacy_opts; |
| DriveMediaType media = MEDIA_DISK; |
| BlockInterfaceType type; |
| int max_devs, bus_id, unit_id, index; |
| const char *werror, *rerror; |
| bool read_only = false; |
| bool copy_on_read; |
| const char *filename; |
| int i; |
| |
| /* Change legacy command line options into QMP ones */ |
| static const struct { |
| const char *from; |
| const char *to; |
| } opt_renames[] = { |
| { "iops", "throttling.iops-total" }, |
| { "iops_rd", "throttling.iops-read" }, |
| { "iops_wr", "throttling.iops-write" }, |
| |
| { "bps", "throttling.bps-total" }, |
| { "bps_rd", "throttling.bps-read" }, |
| { "bps_wr", "throttling.bps-write" }, |
| |
| { "iops_max", "throttling.iops-total-max" }, |
| { "iops_rd_max", "throttling.iops-read-max" }, |
| { "iops_wr_max", "throttling.iops-write-max" }, |
| |
| { "bps_max", "throttling.bps-total-max" }, |
| { "bps_rd_max", "throttling.bps-read-max" }, |
| { "bps_wr_max", "throttling.bps-write-max" }, |
| |
| { "iops_size", "throttling.iops-size" }, |
| |
| { "group", "throttling.group" }, |
| |
| { "readonly", BDRV_OPT_READ_ONLY }, |
| }; |
| |
| for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { |
| if (!qemu_opt_rename(all_opts, opt_renames[i].from, |
| opt_renames[i].to, errp)) { |
| return NULL; |
| } |
| } |
| |
| value = qemu_opt_get(all_opts, "cache"); |
| if (value) { |
| int flags = 0; |
| bool writethrough; |
| |
| if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) { |
| error_setg(errp, "invalid cache option"); |
| return NULL; |
| } |
| |
| /* Specific options take precedence */ |
| if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { |
| qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, |
| !writethrough, &error_abort); |
| } |
| if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { |
| qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, |
| !!(flags & BDRV_O_NOCACHE), &error_abort); |
| } |
| if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { |
| qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, |
| !!(flags & BDRV_O_NO_FLUSH), &error_abort); |
| } |
| qemu_opt_unset(all_opts, "cache"); |
| } |
| |
| /* Get a QDict for processing the options */ |
| bs_opts = qdict_new(); |
| qemu_opts_to_qdict(all_opts, bs_opts); |
| |
| legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, |
| &error_abort); |
| if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) { |
| goto fail; |
| } |
| |
| /* Media type */ |
| value = qemu_opt_get(legacy_opts, "media"); |
| if (value) { |
| if (!strcmp(value, "disk")) { |
| media = MEDIA_DISK; |
| } else if (!strcmp(value, "cdrom")) { |
| media = MEDIA_CDROM; |
| read_only = true; |
| } else { |
| error_setg(errp, "'%s' invalid media", value); |
| goto fail; |
| } |
| } |
| |
| /* copy-on-read is disabled with a warning for read-only devices */ |
| read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false); |
| copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); |
| |
| if (read_only && copy_on_read) { |
| warn_report("disabling copy-on-read on read-only drive"); |
| copy_on_read = false; |
| } |
| |
| qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off"); |
| qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off"); |
| |
| /* Controller type */ |
| value = qemu_opt_get(legacy_opts, "if"); |
| if (value) { |
| for (type = 0; |
| type < IF_COUNT && strcmp(value, if_name[type]); |
| type++) { |
| } |
| if (type == IF_COUNT) { |
| error_setg(errp, "unsupported bus type '%s'", value); |
| goto fail; |
| } |
| } else { |
| type = block_default_type; |
| } |
| |
| /* Device address specified by bus/unit or index. |
| * If none was specified, try to find the first free one. */ |
| bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); |
| unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); |
| index = qemu_opt_get_number(legacy_opts, "index", -1); |
| |
| max_devs = if_max_devs[type]; |
| |
| if (index != -1) { |
| if (bus_id != 0 || unit_id != -1) { |
| error_setg(errp, "index cannot be used with bus and unit"); |
| goto fail; |
| } |
| bus_id = drive_index_to_bus_id(type, index); |
| unit_id = drive_index_to_unit_id(type, index); |
| } |
| |
| if (unit_id == -1) { |
| unit_id = 0; |
| while (drive_get(type, bus_id, unit_id) != NULL) { |
| unit_id++; |
| if (max_devs && unit_id >= max_devs) { |
| unit_id -= max_devs; |
| bus_id++; |
| } |
| } |
| } |
| |
| if (max_devs && unit_id >= max_devs) { |
| error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1); |
| goto fail; |
| } |
| |
| if (drive_get(type, bus_id, unit_id) != NULL) { |
| error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists", |
| bus_id, unit_id, index); |
| goto fail; |
| } |
| |
| /* no id supplied -> create one */ |
| if (qemu_opts_id(all_opts) == NULL) { |
| char *new_id; |
| const char *mediastr = ""; |
| if (type == IF_IDE || type == IF_SCSI) { |
| mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; |
| } |
| if (max_devs) { |
| new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, |
| mediastr, unit_id); |
| } else { |
| new_id = g_strdup_printf("%s%s%i", if_name[type], |
| mediastr, unit_id); |
| } |
| qdict_put_str(bs_opts, "id", new_id); |
| g_free(new_id); |
| } |
| |
| /* Add virtio block device */ |
| if (type == IF_VIRTIO) { |
| QemuOpts *devopts; |
| devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, |
| &error_abort); |
| if (arch_type == QEMU_ARCH_S390X) { |
| qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); |
| } else { |
| qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); |
| } |
| qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), |
| &error_abort); |
| } |
| |
| filename = qemu_opt_get(legacy_opts, "file"); |
| |
| /* Check werror/rerror compatibility with if=... */ |
| werror = qemu_opt_get(legacy_opts, "werror"); |
| if (werror != NULL) { |
| if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && |
| type != IF_NONE) { |
| error_setg(errp, "werror is not supported by this bus type"); |
| goto fail; |
| } |
| qdict_put_str(bs_opts, "werror", werror); |
| } |
| |
| rerror = qemu_opt_get(legacy_opts, "rerror"); |
| if (rerror != NULL) { |
| if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && |
| type != IF_NONE) { |
| error_setg(errp, "rerror is not supported by this bus type"); |
| goto fail; |
| } |
| qdict_put_str(bs_opts, "rerror", rerror); |
| } |
| |
| /* Actual block device init: Functionality shared with blockdev-add */ |
| blk = blockdev_init(filename, bs_opts, errp); |
| bs_opts = NULL; |
| if (!blk) { |
| goto fail; |
| } |
| |
| /* Create legacy DriveInfo */ |
| dinfo = g_malloc0(sizeof(*dinfo)); |
| dinfo->opts = all_opts; |
| |
| dinfo->type = type; |
| dinfo->bus = bus_id; |
| dinfo->unit = unit_id; |
| |
| blk_set_legacy_dinfo(blk, dinfo); |
| |
| switch(type) { |
| case IF_IDE: |
| case IF_SCSI: |
| case IF_XEN: |
| case IF_NONE: |
| dinfo->media_cd = media == MEDIA_CDROM; |
| break; |
| default: |
| break; |
| } |
| |
| fail: |
| qemu_opts_del(legacy_opts); |
| qobject_unref(bs_opts); |
| return dinfo; |
| } |
| |
| static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp) |
| { |
| BlockDriverState *bs; |
| |
| bs = bdrv_lookup_bs(name, name, errp); |
| if (bs == NULL) { |
| return NULL; |
| } |
| |
| if (!bdrv_is_root_node(bs)) { |
| error_setg(errp, "Need a root block node"); |
| return NULL; |
| } |
| |
| if (!bdrv_is_inserted(bs)) { |
| error_setg(errp, "Device has no medium"); |
| return NULL; |
| } |
| |
| return bs; |
| } |
| |
| static void blockdev_do_action(TransactionAction *action, Error **errp) |
| { |
| TransactionActionList list; |
| |
| list.value = action; |
| list.next = NULL; |
| qmp_transaction(&list, false, NULL, errp); |
| } |
| |
| void qmp_blockdev_snapshot_sync(bool has_device, const char *device, |
| bool has_node_name, const char *node_name, |
| const char *snapshot_file, |
| bool has_snapshot_node_name, |
| const char *snapshot_node_name, |
| bool has_format, const char *format, |
| bool has_mode, NewImageMode mode, Error **errp) |
| { |
| BlockdevSnapshotSync snapshot = { |
| .has_device = has_device, |
| .device = (char *) device, |
| .has_node_name = has_node_name, |
| .node_name = (char *) node_name, |
| .snapshot_file = (char *) snapshot_file, |
| .has_snapshot_node_name = has_snapshot_node_name, |
| .snapshot_node_name = (char *) snapshot_node_name, |
| .has_format = has_format, |
| .format = (char *) format, |
| .has_mode = has_mode, |
| .mode = mode, |
| }; |
| TransactionAction action = { |
| .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, |
| .u.blockdev_snapshot_sync.data = &snapshot, |
| }; |
| blockdev_do_action(&action, errp); |
| } |
| |
| void qmp_blockdev_snapshot(const char *node, const char *overlay, |
| Error **errp) |
| { |
| BlockdevSnapshot snapshot_data = { |
| .node = (char *) node, |
| .overlay = (char *) overlay |
| }; |
| TransactionAction action = { |
| .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT, |
| .u.blockdev_snapshot.data = &snapshot_data, |
| }; |
| blockdev_do_action(&action, errp); |
| } |
| |
| void qmp_blockdev_snapshot_internal_sync(const char *device, |
| const char *name, |
| Error **errp) |
| { |
| BlockdevSnapshotInternal snapshot = { |
| .device = (char *) device, |
| .name = (char *) name |
| }; |
| TransactionAction action = { |
| .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, |
| .u.blockdev_snapshot_internal_sync.data = &snapshot, |
| }; |
| blockdev_do_action(&action, errp); |
| } |
| |
| SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, |
| bool has_id, |
| const char *id, |
| bool has_name, |
| const char *name, |
| Error **errp) |
| { |
| BlockDriverState *bs; |
| AioContext *aio_context; |
| QEMUSnapshotInfo sn; |
| Error *local_err = NULL; |
| SnapshotInfo *info = NULL; |
| int ret; |
| |
| bs = qmp_get_root_bs(device, errp); |
| if (!bs) { |
| return NULL; |
| } |
| aio_context = bdrv_get_aio_context(bs); |
| aio_context_acquire(aio_context); |
| |
| if (!has_id) { |
| id = NULL; |
| } |
| |
| if (!has_name) { |
| name = NULL; |
| } |
| |
| if (!id && !name) { |
| error_setg(errp, "Name or id must be provided"); |
| goto out_aio_context; |
| } |
| |
| if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { |
| goto out_aio_context; |
| } |
| |
| ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| goto out_aio_context; |
| } |
| if (!ret) { |
| error_setg(errp, |
| "Snapshot with id '%s' and name '%s' does not exist on " |
| "device '%s'", |
| STR_OR_NULL(id), STR_OR_NULL(name), device); |
| goto out_aio_context; |
| } |
| |
| bdrv_snapshot_delete(bs, id, name, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| goto out_aio_context; |
| } |
| |
| aio_context_release(aio_context); |
| |
| info = g_new0(SnapshotInfo, 1); |
| info->id = g_strdup(sn.id_str); |
| info->name = g_strdup(sn.name); |
| info->date_nsec = sn.date_nsec; |
| info->date_sec = sn.date_sec; |
| info->vm_state_size = sn.vm_state_size; |
| info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; |
| info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; |
| if (sn.icount != -1ULL) { |
| info->icount = sn.icount; |
| info->has_icount = true; |
| } |
| |
| return info; |
| |
| out_aio_context: |
| aio_context_release(aio_context); |
| return NULL; |
| } |
| |
| /* New and old BlockDriverState structs for atomic group operations */ |
| |
| typedef struct BlkActionState BlkActionState; |
| |
| /** |
| * BlkActionOps: |
| * Table of operations that define an Action. |
| * |
| * @instance_size: Size of state struct, in bytes. |
| * @prepare: Prepare the work, must NOT be NULL. |
| * @commit: Commit the changes, can be NULL. |
| * @abort: Abort the changes on fail, can be NULL. |
| * @clean: Clean up resources after all transaction actions have called |
| * commit() or abort(). Can be NULL. |
| * |
| * Only prepare() may fail. In a single transaction, only one of commit() or |
| * abort() will be called. clean() will always be called if it is present. |
| */ |
| typedef struct BlkActionOps { |
| size_t instance_size; |
| void (*prepare)(BlkActionState *common, Error **errp); |
| void (*commit)(BlkActionState *common); |
| void (*abort)(BlkActionState *common); |
| void (*clean)(BlkActionState *common); |
| } BlkActionOps; |
| |
| /** |
| * BlkActionState: |
| * Describes one Action's state within a Transaction. |
| * |
| * @action: QAPI-defined enum identifying which Action to perform. |
| * @ops: Table of ActionOps this Action can perform. |
| * @block_job_txn: Transaction which this action belongs to. |
| * @entry: List membership for all Actions in this Transaction. |
| * |
| * This structure must be arranged as first member in a subclassed type, |
| * assuming that the compiler will also arrange it to the same offsets as the |
| * base class. |
| */ |
| struct BlkActionState { |
| TransactionAction *action; |
| const BlkActionOps *ops; |
| JobTxn *block_job_txn; |
| TransactionProperties *txn_props; |
| QTAILQ_ENTRY(BlkActionState) entry; |
| }; |
| |
| /* internal snapshot private data */ |
| typedef struct InternalSnapshotState { |
| BlkActionState common; |
| BlockDriverState *bs; |
| QEMUSnapshotInfo sn; |
| bool created; |
| } InternalSnapshotState; |
| |
| |
| static int action_check_completion_mode(BlkActionState *s, Error **errp) |
| { |
| if (s->txn_props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { |
| error_setg(errp, |
| "Action '%s' does not support Transaction property " |
| "completion-mode = %s", |
| TransactionActionKind_str(s->action->type), |
| ActionCompletionMode_str(s->txn_props->completion_mode)); |
| return -1; |
| } |
| return 0; |
| } |
| |
| static void internal_snapshot_prepare(BlkActionState *common, |
| Error **errp) |
| { |
| Error *local_err = NULL; |
| const char *device; |
| const char *name; |
| BlockDriverState *bs; |
| QEMUSnapshotInfo old_sn, *sn; |
| bool ret; |
| qemu_timeval tv; |
| BlockdevSnapshotInternal *internal; |
| InternalSnapshotState *state; |
| AioContext *aio_context; |
| int ret1; |
| |
| g_assert(common->action->type == |
| TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); |
| internal = common->action->u.blockdev_snapshot_internal_sync.data; |
| state = DO_UPCAST(InternalSnapshotState, common, common); |
| |
| /* 1. parse input */ |
| device = internal->device; |
| name = internal->name; |
| |
| /* 2. check for validation */ |
| if (action_check_completion_mode(common, errp) < 0) { |
| return; |
| } |
| |
| bs = qmp_get_root_bs(device, errp); |
| if (!bs) { |
| return; |
| } |
| |
| aio_context = bdrv_get_aio_context(bs); |
| aio_context_acquire(aio_context); |
| |
| state->bs = bs; |
| |
| /* Paired with .clean() */ |
| bdrv_drained_begin(bs); |
| |
| if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { |
| goto out; |
| } |
| |
| if (bdrv_is_read_only(bs)) { |
| error_setg(errp, "Device '%s' is read only", device); |
| goto out; |
| } |
| |
| if (!bdrv_can_snapshot(bs)) { |
| error_setg(errp, "Block format '%s' used by device '%s' " |
| "does not support internal snapshots", |
| bs->drv->format_name, device); |
| goto out; |
| } |
| |
| if (!strlen(name)) { |
| error_setg(errp, "Name is empty"); |
| goto out; |
| } |
| |
| /* check whether a snapshot with name exist */ |
| ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, |
| &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| goto out; |
| } else if (ret) { |
| error_setg(errp, |
| "Snapshot with name '%s' already exists on device '%s'", |
| name, device); |
| goto out; |
| } |
| |
| /* 3. take the snapshot */ |
| sn = &state->sn; |
| pstrcpy(sn->name, sizeof(sn->name), name); |
| qemu_gettimeofday(&tv); |
| sn->date_sec = tv.tv_sec; |
| sn->date_nsec = tv.tv_usec * 1000; |
| sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); |
| if (replay_mode != REPLAY_MODE_NONE) { |
| sn->icount = replay_get_current_icount(); |
| } else { |
| sn->icount = -1ULL; |
| } |
| |
| ret1 = bdrv_snapshot_create(bs, sn); |
| if (ret1 < 0) { |
| error_setg_errno(errp, -ret1, |
| "Failed to create snapshot '%s' on device '%s'", |
| name, device); |
| goto out; |
| } |
| |
| /* 4. succeed, mark a snapshot is created */ |
| state->created = true; |
| |
| out: |
| aio_context_release(aio_context); |
| } |
| |
| static void internal_snapshot_abort(BlkActionState *common) |
| { |
| InternalSnapshotState *state = |
| DO_UPCAST(InternalSnapshotState, common, common); |
| BlockDriverState *bs = state->bs; |
| QEMUSnapshotInfo *sn = &state->sn; |
| AioContext *aio_context; |
| Error *local_error = NULL; |
| |
| if (!state->created) { |
| return; |
| } |
| |
| aio_context = bdrv_get_aio_context(state->bs); |
| aio_context_acquire(aio_context); |
| |
| if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { |
| error_reportf_err(local_error, |
| "Failed to delete snapshot with id '%s' and " |
| "name '%s' on device '%s' in abort: ", |
| sn->id_str, sn->name, |
| bdrv_get_device_name(bs)); |
| } |
| |
| aio_context_release(aio_context); |
| } |
| |
| static void internal_snapshot_clean(BlkActionState *common) |
| { |
| InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, |
| common, common); |
| AioContext *aio_context; |
| |
| if (!state->bs) { |
| return; |
| } |
| |
| aio_context = bdrv_get_aio_context(state->bs); |
| aio_context_acquire(aio_context); |
| |
| bdrv_drained_end(state->bs); |
| |
| aio_context_release(aio_context); |
| } |
| |
| /* external snapshot private data */ |
| typedef struct ExternalSnapshotState { |
| BlkActionState common; |
| BlockDriverState *old_bs; |
| BlockDriverState *new_bs; |
| bool overlay_appended; |
| } ExternalSnapshotState; |
| |
| static void external_snapshot_prepare(BlkActionState *common, |
| Error **errp) |
| { |
| int ret; |
| int flags = 0; |
| QDict *options = NULL; |
| Error *local_err = NULL; |
| /* Device and node name of the image to generate the snapshot from */ |
| const char *device; |
| const char *node_name; |
| /* Reference to the new image (for 'blockdev-snapshot') */ |
| const char *snapshot_ref; |
| /* File name of the new image (for 'blockdev-snapshot-sync') */ |
| const char *new_image_file; |
| ExternalSnapshotState *state = |
| DO_UPCAST(ExternalSnapshotState, common, common); |
| TransactionAction *action = common->action; |
| AioContext *aio_context; |
| uint64_t perm, shared; |
| |
| /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar |
| * purpose but a different set of parameters */ |
| switch (action->type) { |
| case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT: |
| { |
| BlockdevSnapshot *s = action->u.blockdev_snapshot.data; |
| device = s->node; |
| node_name = s->node; |
| new_image_file = NULL; |
| snapshot_ref = s->overlay; |
| } |
| break; |
| case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: |
| { |
| BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; |
| device = s->has_device ? s->device : NULL; |
| node_name = s->has_node_name ? s->node_name : NULL; |
| new_image_file = s->snapshot_file; |
| snapshot_ref = NULL; |
| } |
| break; |
| default: |
| g_assert_not_reached(); |
| } |
| |
| /* start processing */ |
| if (action_check_completion_mode(common, errp) < 0) { |
| return; |
| } |
| |
| state->old_bs = bdrv_lookup_bs(device, node_name, errp); |
| if (!state->old_bs) { |
| return; |
| } |
| |
| aio_context = bdrv_get_aio_context(state->old_bs); |
| aio_context_acquire(aio_context); |
| |
| /* Paired with .clean() */ |
| bdrv_drained_begin(state->old_bs); |
| |
| if (!bdrv_is_inserted(state->old_bs)) { |
| error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); |
| goto out; |
| } |
| |
| if (bdrv_op_is_blocked(state->old_bs, |
| BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { |
| goto out; |
| } |
| |
| if (!bdrv_is_read_only(state->old_bs)) { |
| if (bdrv_flush(state->old_bs)) { |
| error_setg(errp, QERR_IO_ERROR); |
| goto out; |
| } |
| } |
| |
| if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) { |
| BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data; |
| const char *format = s->has_format ? s->format : "qcow2"; |
| enum NewImageMode mode; |
| const char *snapshot_node_name = |
| s->has_snapshot_node_name ? s->snapshot_node_name : NULL; |
| |
| if (node_name && !snapshot_node_name) { |
| error_setg(errp, "New overlay node-name missing"); |
| goto out; |
| } |
| |
| if (snapshot_node_name && |
| bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) { |
| error_setg(errp, "New overlay node-name already in use"); |
| goto out; |
| } |
| |
| flags = state->old_bs->open_flags; |
| flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ); |
| flags |= BDRV_O_NO_BACKING; |
| |
| /* create new image w/backing file */ |
| mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS; |
| if (mode != NEW_IMAGE_MODE_EXISTING) { |
| int64_t size = bdrv_getlength(state->old_bs); |
| if (size < 0) { |
| error_setg_errno(errp, -size, "bdrv_getlength failed"); |
| goto out; |
| } |
| bdrv_refresh_filename(state->old_bs); |
| bdrv_img_create(new_image_file, format, |
| state->old_bs->filename, |
| state->old_bs->drv->format_name, |
| NULL, size, flags, false, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| goto out; |
| } |
| } |
| |
| options = qdict_new(); |
| if (snapshot_node_name) { |
| qdict_put_str(options, "node-name", snapshot_node_name); |
| } |
| qdict_put_str(options, "driver", format); |
| } |
| |
| state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags, |
| errp); |
| /* We will manually add the backing_hd field to the bs later */ |
| if (!state->new_bs) { |
| goto out; |
| } |
| |
| /* |
| * Allow attaching a backing file to an overlay that's already in use only |
| * if the parents don't assume that they are already seeing a valid image. |
| * (Specifically, allow it as a mirror target, which is write-only access.) |
| */ |
| bdrv_get_cumulative_perm(state->new_bs, &perm, &shared); |
| if (perm & BLK_PERM_CONSISTENT_READ) { |
| error_setg(errp, "The overlay is already in use"); |
| goto out; |
| } |
| |
| if (state->new_bs->drv->is_filter) { |
| error_setg(errp, "Filters cannot be used as overlays"); |
| goto out; |
| } |
| |
| if (bdrv_cow_child(state->new_bs)) { |
| error_setg(errp, "The overlay already has a backing image"); |
| goto out; |
| } |
| |
| if (!state->new_bs->drv->supports_backing) { |
| error_setg(errp, "The overlay does not support backing images"); |
| goto out; |
| } |
| |
| /* This removes our old bs and adds the new bs. This is an operation that |
| * can fail, so we need to do it in .prepare; undoing it for abort is |
| * always possible. */ |
| bdrv_ref(state->new_bs); |
| ret = bdrv_append(state->new_bs, state->old_bs, errp); |
| if (ret < 0) { |
| goto out; |
| } |
| state->overlay_appended = true; |
| |
| out: |
| aio_context_release(aio_context); |
| } |
| |
| static void external_snapshot_commit(BlkActionState *common) |
| { |
| ExternalSnapshotState *state = |
| DO_UPCAST(ExternalSnapshotState, common, common); |
| AioContext *aio_context; |
| |
| aio_context = bdrv_get_aio_context(state->old_bs); |
| aio_context_acquire(aio_context); |
| |
| /* We don't need (or want) to use the transactional |
| * bdrv_reopen_multiple() across all the entries at once, because we |
| * don't want to abort all of them if one of them fails the reopen */ |
| if (!qatomic_read(&state->old_bs->copy_on_read)) { |
| bdrv_reopen_set_read_only(state->old_bs, true, NULL); |
| } |
| |
| aio_context_release(aio_context); |
| } |
| |
| static void external_snapshot_abort(BlkActionState *common) |
| { |
| ExternalSnapshotState *state = |
| DO_UPCAST(ExternalSnapshotState, common, common); |
| if (state->new_bs) { |
| if (state->overlay_appended) { |
| AioContext *aio_context; |
| AioContext *tmp_context; |
| int ret; |
| |
| aio_context = bdrv_get_aio_context(state->old_bs); |
| aio_context_acquire(aio_context); |
| |
| bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd() |
| close state->old_bs; we need it */ |
| bdrv_set_backing_hd(state->new_bs, NULL, &error_abort); |
| |
| /* |
| * The call to bdrv_set_backing_hd() above returns state->old_bs to |
| * the main AioContext. As we're still going to be using it, return |
| * it to the AioContext it was before. |
| */ |
| tmp_context = bdrv_get_aio_context(state->old_bs); |
| if (aio_context != tmp_context) { |
| aio_context_release(aio_context); |
| aio_context_acquire(tmp_context); |
| |
| ret = bdrv_try_set_aio_context(state->old_bs, |
| aio_context, NULL); |
| assert(ret == 0); |
| |
| aio_context_release(tmp_context); |
| aio_context_acquire(aio_context); |
| } |
| |
| bdrv_replace_node(state->new_bs, state->old_bs, &error_abort); |
| bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */ |
| |
| aio_context_release(aio_context); |
| } |
| } |
| } |
| |
| static void external_snapshot_clean(BlkActionState *common) |
| { |
| ExternalSnapshotState *state = |
| DO_UPCAST(ExternalSnapshotState, common, common); |
| AioContext *aio_context; |
| |
| if (!state->old_bs) { |
| return; |
| } |
| |
| aio_context = bdrv_get_aio_context(state->old_bs); |
| aio_context_acquire(aio_context); |
| |
| bdrv_drained_end(state->old_bs); |
| bdrv_unref(state->new_bs); |
| |
| aio_context_release(aio_context); |
| } |
| |
| typedef struct DriveBackupState { |
| BlkActionState common; |
| BlockDriverState *bs; |
| BlockJob *job; |
| } DriveBackupState; |
| |
| static BlockJob *do_backup_common(BackupCommon *backup, |
| BlockDriverState *bs, |
| BlockDriverState *target_bs, |
| AioContext *aio_context, |
| JobTxn *txn, Error **errp); |
| |
| static void drive_backup_prepare(BlkActionState *common, Error **errp) |
| { |
| DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); |
| DriveBackup *backup; |
| BlockDriverState *bs; |
| BlockDriverState *target_bs; |
| BlockDriverState *source = NULL; |
| AioContext *aio_context; |
| AioContext *old_context; |
| QDict *options; |
| Error *local_err = NULL; |
| int flags; |
| int64_t size; |
| bool set_backing_hd = false; |
| int ret; |
| |
| assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); |
| backup = common->action->u.drive_backup.data; |
| |
| if (!backup->has_mode) { |
| backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; |
| } |
| |
| bs = bdrv_lookup_bs(backup->device, backup->device, errp); |
| if (!bs) { |
| return; |
| } |
| |
| if (!bs->drv) { |
| error_setg(errp, "Device has no medium"); |
| return; |
| } |
| |
| aio_context = bdrv_get_aio_context(bs); |
| aio_context_acquire(aio_context); |
| |
| /* Paired with .clean() */ |
| bdrv_drained_begin(bs); |
| |
| if (!backup->has_format) { |
| backup->format = backup->mode == NEW_IMAGE_MODE_EXISTING ? |
| NULL : (char *) bs->drv->format_name; |
| } |
| |
| /* Early check to avoid creating target */ |
| if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { |
| goto out; |
| } |
| |
| flags = bs->open_flags | BDRV_O_RDWR; |
| |
| /* |
| * See if we have a backing HD we can use to create our new image |
| * on top of. |
| */ |
| if (backup->sync == MIRROR_SYNC_MODE_TOP) { |
| /* |
| * Backup will not replace the source by the target, so none |
| * of the filters skipped here will be removed (in contrast to |
| * mirror). Therefore, we can skip all of them when looking |
| * for the first COW relationship. |
| */ |
| source = bdrv_cow_bs(bdrv_skip_filters(bs)); |
| if (!source) { |
| backup->sync = MIRROR_SYNC_MODE_FULL; |
| } |
| } |
| if (backup->sync == MIRROR_SYNC_MODE_NONE) { |
| source = bs; |
| flags |= BDRV_O_NO_BACKING; |
| set_backing_hd = true; |
| } |
| |
| size = bdrv_getlength(bs); |
| if (size < 0) { |
| error_setg_errno(errp, -size, "bdrv_getlength failed"); |
| goto out; |
| } |
| |
| if (backup->mode != NEW_IMAGE_MODE_EXISTING) { |
| assert(backup->format); |
| if (source) { |
| /* Implicit filters should not appear in the filename */ |
| BlockDriverState *explicit_backing = |
| bdrv_skip_implicit_filters(source); |
| |
| bdrv_refresh_filename(explicit_backing); |
| bdrv_img_create(backup->target, backup->format, |
| explicit_backing->filename, |
| explicit_backing->drv->format_name, NULL, |
| size, flags, false, &local_err); |
| } else { |
| bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL, |
| size, flags, false, &local_err); |
| } |
| } |
| |
| if (local_err) { |
| error_propagate(errp, local_err); |
| goto out; |
| } |
| |
| options = qdict_new(); |
| qdict_put_str(options, "discard", "unmap"); |
| qdict_put_str(options, "detect-zeroes", "unmap"); |
| if (backup->format) { |
| qdict_put_str(options, "driver", backup->format); |
| } |
| |
| target_bs = bdrv_open(backup->target, NULL, options, flags, errp); |
| if (!target_bs) { |
| goto out; |
| } |
| |
| /* Honor bdrv_try_set_aio_context() context acquisition requirements. */ |
| old_context = bdrv_get_aio_context(target_bs); |
| aio_context_release(aio_context); |
| aio_context_acquire(old_context); |
| |
| ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); |
| if (ret < 0) { |
| bdrv_unref(target_bs); |
| aio_context_release(old_context); |
| return; |
| } |
| |
| aio_context_release(old_context); |
| aio_context_acquire(aio_context); |
| |
| if (set_backing_hd) { |
| if (bdrv_set_backing_hd(target_bs, source, errp) < 0) { |
| goto unref; |
| } |
| } |
| |
| state->bs = bs; |
| |
| state->job = do_backup_common(qapi_DriveBackup_base(backup), |
| bs, target_bs, aio_context, |
| common->block_job_txn, errp); |
| |
| unref: |
| bdrv_unref(target_bs); |
| out: |
| aio_context_release(aio_context); |
| } |
| |
| static void drive_backup_commit(BlkActionState *common) |
| { |
| DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); |
| AioContext *aio_context; |
| |
| aio_context = bdrv_get_aio_context(state->bs); |
| aio_context_acquire(aio_context); |
| |
| assert(state->job); |
| job_start(&state->job->job); |
| |
| aio_context_release(aio_context); |
| } |
| |
| static void drive_backup_abort(BlkActionState *common) |
| { |
| DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); |
| |
| if (state->job) { |
| AioContext *aio_context; |
| |
| aio_context = bdrv_get_aio_context(state->bs); |
| aio_context_acquire(aio_context); |
| |
| job_cancel_sync(&state->job->job); |
| |
| aio_context_release(aio_context); |
| } |
| } |
| |
| static void drive_backup_clean(BlkActionState *common) |
| { |
| DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); |
| AioContext *aio_context; |
| |
| if (!state->bs) { |
| return; |
| } |
| |
| aio_context = bdrv_get_aio_context(state->bs); |
| aio_context_acquire(aio_context); |
| |
| bdrv_drained_end(state->bs); |
| |
| aio_context_release(aio_context); |
| } |
| |
| typedef struct BlockdevBackupState { |
| BlkActionState common; |
| BlockDriverState *bs; |
| BlockJob *job; |
| } BlockdevBackupState; |
| |
| static void blockdev_backup_prepare(BlkActionState *common, Error **errp) |
| { |
| BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); |
| BlockdevBackup *backup; |
| BlockDriverState *bs; |
| BlockDriverState *target_bs; |
| AioContext *aio_context; |
| AioContext *old_context; |
| int ret; |
| |
| assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); |
| backup = common->action->u.blockdev_backup.data; |
| |
| bs = bdrv_lookup_bs(backup->device, backup->device, errp); |
| if (!bs) { |
| return; |
| } |
| |
| target_bs = bdrv_lookup_bs(backup->target, backup->target, errp); |
| if (!target_bs) { |
| return; |
| } |
| |
| /* Honor bdrv_try_set_aio_context() context acquisition requirements. */ |
| aio_context = bdrv_get_aio_context(bs); |
| old_context = bdrv_get_aio_context(target_bs); |
| aio_context_acquire(old_context); |
| |
| ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); |
| if (ret < 0) { |
| aio_context_release(old_context); |
| return; |
| } |
| |
| aio_context_release(old_context); |
| aio_context_acquire(aio_context); |
| state->bs = bs; |
| |
| /* Paired with .clean() */ |
| bdrv_drained_begin(state->bs); |
| |
| state->job = do_backup_common(qapi_BlockdevBackup_base(backup), |
| bs, target_bs, aio_context, |
| common->block_job_txn, errp); |
| |
| aio_context_release(aio_context); |
| } |
| |
| static void blockdev_backup_commit(BlkActionState *common) |
| { |
| BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); |
| AioContext *aio_context; |
| |
| aio_context = bdrv_get_aio_context(state->bs); |
| aio_context_acquire(aio_context); |
| |
| assert(state->job); |
| job_start(&state->job->job); |
| |
| aio_context_release(aio_context); |
| } |
| |
| static void blockdev_backup_abort(BlkActionState *common) |
| { |
| BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); |
| |
| if (state->job) { |
| AioContext *aio_context; |
| |
| aio_context = bdrv_get_aio_context(state->bs); |
| aio_context_acquire(aio_context); |
| |
| job_cancel_sync(&state->job->job); |
| |
| aio_context_release(aio_context); |
| } |
| } |
| |
| static void blockdev_backup_clean(BlkActionState *common) |
| { |
| BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); |
| AioContext *aio_context; |
| |
| if (!state->bs) { |
| return; |
| } |
| |
| aio_context = bdrv_get_aio_context(state->bs); |
| aio_context_acquire(aio_context); |
| |
| bdrv_drained_end(state->bs); |
| |
| aio_context_release(aio_context); |
| } |
| |
| typedef struct BlockDirtyBitmapState { |
| BlkActionState common; |
| BdrvDirtyBitmap *bitmap; |
| BlockDriverState *bs; |
| HBitmap *backup; |
| bool prepared; |
| bool was_enabled; |
| } BlockDirtyBitmapState; |
| |
| static void block_dirty_bitmap_add_prepare(BlkActionState *common, |
| Error **errp) |
| { |
| Error *local_err = NULL; |
| BlockDirtyBitmapAdd *action; |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| |
| if (action_check_completion_mode(common, errp) < 0) { |
| return; |
| } |
| |
| action = common->action->u.block_dirty_bitmap_add.data; |
| /* AIO context taken and released within qmp_block_dirty_bitmap_add */ |
| qmp_block_dirty_bitmap_add(action->node, action->name, |
| action->has_granularity, action->granularity, |
| action->has_persistent, action->persistent, |
| action->has_disabled, action->disabled, |
| &local_err); |
| |
| if (!local_err) { |
| state->prepared = true; |
| } else { |
| error_propagate(errp, local_err); |
| } |
| } |
| |
| static void block_dirty_bitmap_add_abort(BlkActionState *common) |
| { |
| BlockDirtyBitmapAdd *action; |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| |
| action = common->action->u.block_dirty_bitmap_add.data; |
| /* Should not be able to fail: IF the bitmap was added via .prepare(), |
| * then the node reference and bitmap name must have been valid. |
| */ |
| if (state->prepared) { |
| qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort); |
| } |
| } |
| |
| static void block_dirty_bitmap_clear_prepare(BlkActionState *common, |
| Error **errp) |
| { |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| BlockDirtyBitmap *action; |
| |
| if (action_check_completion_mode(common, errp) < 0) { |
| return; |
| } |
| |
| action = common->action->u.block_dirty_bitmap_clear.data; |
| state->bitmap = block_dirty_bitmap_lookup(action->node, |
| action->name, |
| &state->bs, |
| errp); |
| if (!state->bitmap) { |
| return; |
| } |
| |
| if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) { |
| return; |
| } |
| |
| bdrv_clear_dirty_bitmap(state->bitmap, &state->backup); |
| } |
| |
| static void block_dirty_bitmap_restore(BlkActionState *common) |
| { |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| |
| if (state->backup) { |
| bdrv_restore_dirty_bitmap(state->bitmap, state->backup); |
| } |
| } |
| |
| static void block_dirty_bitmap_free_backup(BlkActionState *common) |
| { |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| |
| hbitmap_free(state->backup); |
| } |
| |
| static void block_dirty_bitmap_enable_prepare(BlkActionState *common, |
| Error **errp) |
| { |
| BlockDirtyBitmap *action; |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| |
| if (action_check_completion_mode(common, errp) < 0) { |
| return; |
| } |
| |
| action = common->action->u.block_dirty_bitmap_enable.data; |
| state->bitmap = block_dirty_bitmap_lookup(action->node, |
| action->name, |
| NULL, |
| errp); |
| if (!state->bitmap) { |
| return; |
| } |
| |
| if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { |
| return; |
| } |
| |
| state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); |
| bdrv_enable_dirty_bitmap(state->bitmap); |
| } |
| |
| static void block_dirty_bitmap_enable_abort(BlkActionState *common) |
| { |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| |
| if (!state->was_enabled) { |
| bdrv_disable_dirty_bitmap(state->bitmap); |
| } |
| } |
| |
| static void block_dirty_bitmap_disable_prepare(BlkActionState *common, |
| Error **errp) |
| { |
| BlockDirtyBitmap *action; |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| |
| if (action_check_completion_mode(common, errp) < 0) { |
| return; |
| } |
| |
| action = common->action->u.block_dirty_bitmap_disable.data; |
| state->bitmap = block_dirty_bitmap_lookup(action->node, |
| action->name, |
| NULL, |
| errp); |
| if (!state->bitmap) { |
| return; |
| } |
| |
| if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) { |
| return; |
| } |
| |
| state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap); |
| bdrv_disable_dirty_bitmap(state->bitmap); |
| } |
| |
| static void block_dirty_bitmap_disable_abort(BlkActionState *common) |
| { |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| |
| if (state->was_enabled) { |
| bdrv_enable_dirty_bitmap(state->bitmap); |
| } |
| } |
| |
| static void block_dirty_bitmap_merge_prepare(BlkActionState *common, |
| Error **errp) |
| { |
| BlockDirtyBitmapMerge *action; |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| |
| if (action_check_completion_mode(common, errp) < 0) { |
| return; |
| } |
| |
| action = common->action->u.block_dirty_bitmap_merge.data; |
| |
| state->bitmap = block_dirty_bitmap_merge(action->node, action->target, |
| action->bitmaps, &state->backup, |
| errp); |
| } |
| |
| static void block_dirty_bitmap_remove_prepare(BlkActionState *common, |
| Error **errp) |
| { |
| BlockDirtyBitmap *action; |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| |
| if (action_check_completion_mode(common, errp) < 0) { |
| return; |
| } |
| |
| action = common->action->u.block_dirty_bitmap_remove.data; |
| |
| state->bitmap = block_dirty_bitmap_remove(action->node, action->name, |
| false, &state->bs, errp); |
| if (state->bitmap) { |
| bdrv_dirty_bitmap_skip_store(state->bitmap, true); |
| bdrv_dirty_bitmap_set_busy(state->bitmap, true); |
| } |
| } |
| |
| static void block_dirty_bitmap_remove_abort(BlkActionState *common) |
| { |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| |
| if (state->bitmap) { |
| bdrv_dirty_bitmap_skip_store(state->bitmap, false); |
| bdrv_dirty_bitmap_set_busy(state->bitmap, false); |
| } |
| } |
| |
| static void block_dirty_bitmap_remove_commit(BlkActionState *common) |
| { |
| BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, |
| common, common); |
| |
| bdrv_dirty_bitmap_set_busy(state->bitmap, false); |
| bdrv_release_dirty_bitmap(state->bitmap); |
| } |
| |
| static void abort_prepare(BlkActionState *common, Error **errp) |
| { |
| error_setg(errp, "Transaction aborted using Abort action"); |
| } |
| |
| static void abort_commit(BlkActionState *common) |
| { |
| g_assert_not_reached(); /* this action never succeeds */ |
| } |
| |
| static const BlkActionOps actions[] = { |
| [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { |
| .instance_size = sizeof(ExternalSnapshotState), |
| .prepare = external_snapshot_prepare, |
| .commit = external_snapshot_commit, |
| .abort = external_snapshot_abort, |
| .clean = external_snapshot_clean, |
| }, |
| [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { |
| .instance_size = sizeof(ExternalSnapshotState), |
| .prepare = external_snapshot_prepare, |
| .commit = external_snapshot_commit, |
| .abort = external_snapshot_abort, |
| .clean = external_snapshot_clean, |
| }, |
| [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { |
| .instance_size = sizeof(DriveBackupState), |
| .prepare = drive_backup_prepare, |
| .commit = drive_backup_commit, |
| .abort = drive_backup_abort, |
| .clean = drive_backup_clean, |
| }, |
| [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { |
| .instance_size = sizeof(BlockdevBackupState), |
| .prepare = blockdev_backup_prepare, |
| .commit = blockdev_backup_commit, |
| .abort = blockdev_backup_abort, |
| .clean = blockdev_backup_clean, |
| }, |
| [TRANSACTION_ACTION_KIND_ABORT] = { |
| .instance_size = sizeof(BlkActionState), |
| .prepare = abort_prepare, |
| .commit = abort_commit, |
| }, |
| [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { |
| .instance_size = sizeof(InternalSnapshotState), |
| .prepare = internal_snapshot_prepare, |
| .abort = internal_snapshot_abort, |
| .clean = internal_snapshot_clean, |
| }, |
| [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = { |
| .instance_size = sizeof(BlockDirtyBitmapState), |
| .prepare = block_dirty_bitmap_add_prepare, |
| .abort = block_dirty_bitmap_add_abort, |
| }, |
| [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = { |
| .instance_size = sizeof(BlockDirtyBitmapState), |
| .prepare = block_dirty_bitmap_clear_prepare, |
| .commit = block_dirty_bitmap_free_backup, |
| .abort = block_dirty_bitmap_restore, |
| }, |
| [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE] = { |
| .instance_size = sizeof(BlockDirtyBitmapState), |
| .prepare = block_dirty_bitmap_enable_prepare, |
| .abort = block_dirty_bitmap_enable_abort, |
| }, |
| [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE] = { |
| .instance_size = sizeof(BlockDirtyBitmapState), |
| .prepare = block_dirty_bitmap_disable_prepare, |
| .abort = block_dirty_bitmap_disable_abort, |
| }, |
| [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE] = { |
| .instance_size = sizeof(BlockDirtyBitmapState), |
| .prepare = block_dirty_bitmap_merge_prepare, |
| .commit = block_dirty_bitmap_free_backup, |
| .abort = block_dirty_bitmap_restore, |
| }, |
| [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE] = { |
| .instance_size = sizeof(BlockDirtyBitmapState), |
| .prepare = block_dirty_bitmap_remove_prepare, |
| .commit = block_dirty_bitmap_remove_commit, |
| .abort = block_dirty_bitmap_remove_abort, |
| }, |
| /* Where are transactions for MIRROR, COMMIT and STREAM? |
| * Although these blockjobs use transaction callbacks like the backup job, |
| * these jobs do not necessarily adhere to transaction semantics. |
| * These jobs may not fully undo all of their actions on abort, nor do they |
| * necessarily work in transactions with more than one job in them. |
| */ |
| }; |
| |
| /** |
| * Allocate a TransactionProperties structure if necessary, and fill |
| * that structure with desired defaults if they are unset. |
| */ |
| static TransactionProperties *get_transaction_properties( |
| TransactionProperties *props) |
| { |
| if (!props) { |
| props = g_new0(TransactionProperties, 1); |
| } |
| |
| if (!props->has_completion_mode) { |
| props->has_completion_mode = true; |
| props->completion_mode = ACTION_COMPLETION_MODE_INDIVIDUAL; |
| } |
| |
| return props; |
| } |
| |
| /* |
| * 'Atomic' group operations. The operations are performed as a set, and if |
| * any fail then we roll back all operations in the group. |
| */ |
| void qmp_transaction(TransactionActionList *dev_list, |
| bool has_props, |
| struct TransactionProperties *props, |
| Error **errp) |
| { |
| TransactionActionList *dev_entry = dev_list; |
| JobTxn *block_job_txn = NULL; |
| BlkActionState *state, *next; |
| Error *local_err = NULL; |
| |
| QTAILQ_HEAD(, BlkActionState) snap_bdrv_states; |
| QTAILQ_INIT(&snap_bdrv_states); |
| |
| /* Does this transaction get canceled as a group on failure? |
| * If not, we don't really need to make a JobTxn. |
| */ |
| props = get_transaction_properties(props); |
| if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) { |
| block_job_txn = job_txn_new(); |
| } |
| |
| /* drain all i/o before any operations */ |
| bdrv_drain_all(); |
| |
| /* We don't do anything in this loop that commits us to the operations */ |
| while (NULL != dev_entry) { |
| TransactionAction *dev_info = NULL; |
| const BlkActionOps *ops; |
| |
| dev_info = dev_entry->value; |
| dev_entry = dev_entry->next; |
| |
| assert(dev_info->type < ARRAY_SIZE(actions)); |
| |
| ops = &actions[dev_info->type]; |
| assert(ops->instance_size > 0); |
| |
| state = g_malloc0(ops->instance_size); |
| state->ops = ops; |
| state->action = dev_info; |
| state->block_job_txn = block_job_txn; |
| state->txn_props = props; |
| QTAILQ_INSERT_TAIL(&snap_bdrv_states, state, entry); |
| |
| state->ops->prepare(state, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| goto delete_and_fail; |
| } |
| } |
| |
| QTAILQ_FOREACH(state, &snap_bdrv_states, entry) { |
| if (state->ops->commit) { |
| state->ops->commit(state); |
| } |
| } |
| |
| /* success */ |
| goto exit; |
| |
| delete_and_fail: |
| /* failure, and it is all-or-none; roll back all operations */ |
| QTAILQ_FOREACH_REVERSE(state, &snap_bdrv_states, entry) { |
| if (state->ops->abort) { |
| state->ops->abort(state); |
| } |
| } |
| exit: |
| QTAILQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { |
| if (state->ops->clean) { |
| state->ops->clean(state); |
| } |
| g_free(state); |
| } |
| if (!has_props) { |
| qapi_free_TransactionProperties(props); |
| } |
| job_txn_unref(block_job_txn); |
| } |
| |
| void qmp_block_passwd(bool has_device, const char *device, |
| bool has_node_name, const char *node_name, |
| const char *password, Error **errp) |
| { |
| error_setg(errp, |
| "Setting block passwords directly is no longer supported"); |
| } |
| |
| BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, |
| const char *name, |
| Error **errp) |
| { |
| BdrvDirtyBitmap *bitmap; |
| BlockDriverState *bs; |
| BlockDirtyBitmapSha256 *ret = NULL; |
| char *sha256; |
| |
| bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); |
| if (!bitmap || !bs) { |
| return NULL; |
| } |
| |
| sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp); |
| if (sha256 == NULL) { |
| return NULL; |
| } |
| |
| ret = g_new(BlockDirtyBitmapSha256, 1); |
| ret->sha256 = sha256; |
| |
| return ret; |
| } |
| |
| void coroutine_fn qmp_block_resize(bool has_device, const char *device, |
| bool has_node_name, const char *node_name, |
| int64_t size, Error **errp) |
| { |
| Error *local_err = NULL; |
| BlockBackend *blk; |
| BlockDriverState *bs; |
| AioContext *old_ctx; |
| |
| bs = bdrv_lookup_bs(has_device ? device : NULL, |
| has_node_name ? node_name : NULL, |
| &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| return; |
| } |
| |
| if (size < 0) { |
| error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); |
| return; |
| } |
| |
| if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { |
| error_setg(errp, QERR_DEVICE_IN_USE, device); |
| return; |
| } |
| |
| blk = blk_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp); |
| if (!blk) { |
| return; |
| } |
| |
| bdrv_co_lock(bs); |
| bdrv_drained_begin(bs); |
| bdrv_co_unlock(bs); |
| |
| old_ctx = bdrv_co_enter(bs); |
| blk_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp); |
| bdrv_co_leave(bs, old_ctx); |
| |
| bdrv_co_lock(bs); |
| bdrv_drained_end(bs); |
| blk_unref(blk); |
| bdrv_co_unlock(bs); |
| } |
| |
| void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, |
| bool has_base, const char *base, |
| bool has_base_node, const char *base_node, |
| bool has_backing_file, const char *backing_file, |
| bool has_bottom, const char *bottom, |
| bool has_speed, int64_t speed, |
| bool has_on_error, BlockdevOnError on_error, |
| bool has_filter_node_name, const char *filter_node_name, |
| bool has_auto_finalize, bool auto_finalize, |
| bool has_auto_dismiss, bool auto_dismiss, |
| Error **errp) |
| { |
| BlockDriverState *bs, *iter, *iter_end; |
| BlockDriverState *base_bs = NULL; |
| BlockDriverState *bottom_bs = NULL; |
| AioContext *aio_context; |
| Error *local_err = NULL; |
| int job_flags = JOB_DEFAULT; |
| |
| if (has_base && has_base_node) { |
| error_setg(errp, "'base' and 'base-node' cannot be specified " |
| "at the same time"); |
| return; |
| } |
| |
| if (has_base && has_bottom) { |
| error_setg(errp, "'base' and 'bottom' cannot be specified " |
| "at the same time"); |
| return; |
| } |
| |
| if (has_bottom && has_base_node) { |
| error_setg(errp, "'bottom' and 'base-node' cannot be specified " |
| "at the same time"); |
| return; |
| } |
| |
| if (!has_on_error) { |
| on_error = BLOCKDEV_ON_ERROR_REPORT; |
| } |
| |
| bs = bdrv_lookup_bs(device, device, errp); |
| if (!bs) { |
| return; |
| } |
| |
| aio_context = bdrv_get_aio_context(bs); |
| aio_context_acquire(aio_context); |
| |
| if (has_base) { |
| base_bs = bdrv_find_backing_image(bs, base); |
| if (base_bs == NULL) { |
| error_setg(errp, "Can't find '%s' in the backing chain", base); |
| goto out; |
| } |
| assert(bdrv_get_aio_context(base_bs) == aio_context); |
| } |
| |
| if (has_base_node) { |
| base_bs = bdrv_lookup_bs(NULL, base_node, errp); |
| if (!base_bs) { |
| goto out; |
| } |
| if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) { |
| error_setg(errp, "Node '%s' is not a backing image of '%s'", |
| base_node, device); |
| goto out; |
| } |
| assert(bdrv_get_aio_context(base_bs) == aio_context); |
| bdrv_refresh_filename(base_bs); |
| } |
| |
| if (has_bottom) { |
| bottom_bs = bdrv_lookup_bs(NULL, bottom, errp); |
| if (!bottom_bs) { |
| goto out; |
| } |
| if (!bottom_bs->drv) { |
| error_setg(errp, "Node '%s' is not open", bottom); |
| goto out; |
| } |
| if (bottom_bs->drv->is_filter) { |
| error_setg(errp, "Node '%s' is a filter, use a non-filter node " |
| "as 'bottom'", bottom); |
| goto out; |
| } |
| if (!bdrv_chain_contains(bs, bottom_bs)) { |
| error_setg(errp, "Node '%s' is not in a chain starting from '%s'", |
| bottom, device); |
| goto out; |
| } |
| assert(bdrv_get_aio_context(bottom_bs) == aio_context); |
| } |
| |
| /* |
| * Check for op blockers in the whole chain between bs and base (or bottom) |
| */ |
| iter_end = has_bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs; |
| for (iter = bs; iter && iter != iter_end; |
| iter = bdrv_filter_or_cow_bs(iter)) |
| { |
| if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) { |
| goto out; |
| } |
| } |
| |
| /* if we are streaming the entire chain, the result will have no backing |
| * file, and specifying one is therefore an error */ |
| if (base_bs == NULL && has_backing_file) { |
| error_setg(errp, "backing file specified, but streaming the " |
| "entire chain"); |
| goto out; |
| } |
| |
| if (has_auto_finalize && !auto_finalize) { |
| job_flags |= JOB_MANUAL_FINALIZE; |
| } |
| if (has_auto_dismiss && !auto_dismiss) { |
| job_flags |= JOB_MANUAL_DISMISS; |
| } |
| |
| stream_start(has_job_id ? job_id : NULL, bs, base_bs, backing_file, |
| bottom_bs, job_flags, has_speed ? speed : 0, on_error, |
| filter_node_name, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| goto out; |
| } |
| |
| trace_qmp_block_stream(bs); |
| |
| out: |
| aio_context_release(aio_context); |
| } |
| |
| void qmp_block_commit(bool has_job_id, const char *job_id, const char *device, |
| bool has_base_node, const char *base_node, |
| bool has_base, const char *base, |
| bool has_top_node, const char *top_node, |
| bool has_top, const char *top, |
| bool has_backing_file, const char *backing_file, |
| bool has_speed, int64_t speed, |
| bool has_on_error, BlockdevOnError on_error, |
| bool has_filter_node_name, const char *filter_node_name, |
| bool has_auto_finalize, bool auto_finalize, |
| bool has_auto_dismiss, bool auto_dismiss, |
| Error **errp) |
| { |
| BlockDriverState *bs; |
| BlockDriverState *iter; |
| BlockDriverState *base_bs, *top_bs; |
| AioContext *aio_context; |
| Error *local_err = NULL; |
| int job_flags = JOB_DEFAULT; |
| uint64_t top_perm, top_shared; |
| |
| if (!has_speed) { |
| speed = 0; |
| } |
| if (!has_on_error) { |
| on_error = BLOCKDEV_ON_ERROR_REPORT; |
| } |
| if (!has_filter_node_name) { |
| filter_node_name = NULL; |
| } |
| if (has_auto_finalize && !auto_finalize) { |
| job_flags |= JOB_MANUAL_FINALIZE; |
| } |
| if (has_auto_dismiss && !auto_dismiss) { |
| job_flags |= JOB_MANUAL_DISMISS; |
| } |
| |
| /* Important Note: |
| * libvirt relies on the DeviceNotFound error class in order to probe for |
| * live commit feature versions; for this to work, we must make sure to |
| * perform the device lookup before any generic errors that may occur in a |
| * scenario in which all optional arguments are omitted. */ |
| bs = qmp_get_root_bs(device, &local_err); |
| if (!bs) { |
| bs = bdrv_lookup_bs(device, device, NULL); |
| if (!bs) { |
| error_free(local_err); |
| error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, |
| "Device '%s' not found", device); |
| } else { |
| error_propagate(errp, local_err); |
| } |
| return; |
| } |
| |
| aio_context = bdrv_get_aio_context(bs); |
| aio_context_acquire(aio_context); |
| |
| if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { |
| goto out; |
| } |
| |
| /* default top_bs is the active layer */ |
| top_bs = bs; |
| |
| if (has_top_node && has_top) { |
| error_setg(errp, "'top-node' and 'top' are mutually exclusive"); |
| goto out; |
| } else if (has_top_node) { |
| top_bs = bdrv_lookup_bs(NULL, top_node, errp); |
| if (top_bs == NULL) { |
| goto out; |
| } |
| if (!bdrv_chain_contains(bs, top_bs)) { |
| error_setg(errp, "'%s' is not in this backing file chain", |
| top_node); |
| goto out; |
| } |
| } else if (has_top && top) { |
| /* This strcmp() is just a shortcut, there is no need to |
| * refresh @bs's filename. If it mismatches, |
| * bdrv_find_backing_image() will do the refresh and may still |
| * return @bs. */ |
| if (strcmp(bs->filename, top) != 0) { |
| top_bs = bdrv_find_backing_image(bs, top); |
| } |
| } |
| |
| if (top_bs == NULL) { |
| error_setg(errp, "Top image file %s not found", top ? top : "NULL"); |
| goto out; |
| } |
| |
| assert(bdrv_get_aio_context(top_bs) == aio_context); |
| |
| if (has_base_node && has_base) { |
| error_setg(errp, "'base-node' and 'base' are mutually exclusive"); |
| goto out; |
| } else if (has_base_node) { |
| base_bs = bdrv_lookup_bs(NULL, base_node, errp); |
| if (base_bs == NULL) { |
| goto out; |
| } |
| if (!bdrv_chain_contains(top_bs, base_bs)) { |
| error_setg(errp, "'%s' is not in this backing file chain", |
| base_node); |
| goto out; |
| } |
| } else if (has_base && base) { |
| base_bs = bdrv_find_backing_image(top_bs, base); |
| if (base_bs == NULL) { |
| error_setg(errp, "Can't find '%s' in the backing chain", base); |
| goto out; |
| } |
| } else { |
| base_bs = bdrv_find_base(top_bs); |
| if (base_bs == NULL) { |
| error_setg(errp, "There is no backimg image"); |
| goto out; |
| } |
| } |
| |
| assert(bdrv_get_aio_context(base_bs) == aio_context); |
| |
| for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs); |
| iter = bdrv_filter_or_cow_bs(iter)) |
| { |
| if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { |
| goto out; |
| } |
| } |
| |
| /* Do not allow attempts to commit an image into itself */ |
| if (top_bs == base_bs) { |
| error_setg(errp, "cannot commit an image into itself"); |
| goto out; |
| } |
| |
| /* |
| * Active commit is required if and only if someone has taken a |
| * WRITE permission on the top node. Historically, we have always |
| * used active commit for top nodes, so continue that practice |
| * lest we possibly break clients that rely on this behavior, e.g. |
| * to later attach this node to a writing parent. |
| * (Active commit is never really wrong.) |
| */ |
| bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared); |
| if (top_perm & BLK_PERM_WRITE || |
| bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) |
| { |
| if (has_backing_file) { |
| if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) { |
| error_setg(errp, "'backing-file' specified," |
| " but 'top' is the active layer"); |
| } else { |
| error_setg(errp, "'backing-file' specified, but 'top' has a " |
| "writer on it"); |
| } |
| goto out; |
| } |
| if (!has_job_id) { |
| /* |
| * Emulate here what block_job_create() does, because it |
| * is possible that @bs != @top_bs (the block job should |
| * be named after @bs, even if @top_bs is the actual |
| * source) |
| */ |
| job_id = bdrv_get_device_name(bs); |
| } |
| commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error, |
| filter_node_name, NULL, NULL, false, &local_err); |
| } else { |
| BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs); |
| if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { |
| goto out; |
| } |
| commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, job_flags, |
| speed, on_error, has_backing_file ? backing_file : NULL, |
| filter_node_name, &local_err); |
| } |
| if (local_err != NULL) { |
| error_propagate(errp, local_err); |
| goto out; |
| } |
| |
| out: |
| aio_context_release(aio_context); |
| } |
| |
| /* Common QMP interface for drive-backup and blockdev-backup */ |
| static BlockJob *do_backup_common(BackupCommon *backup, |
| BlockDriverState *bs, |
| BlockDriverState *target_bs, |
| AioContext *aio_context, |
| JobTxn *txn, Error **errp) |
| { |
| BlockJob *job = NULL; |
| BdrvDirtyBitmap *bmap = NULL; |
| BackupPerf perf = { .max_workers = 64 }; |
| int job_flags = JOB_DEFAULT; |
| |
| if (!backup->has_speed) { |
| backup->speed = 0; |
| } |
| if (!backup->has_on_source_error) { |
| backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT; |
| } |
| if (!backup->has_on_target_error) { |
| backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT; |
| } |
| if (!backup->has_job_id) { |
| backup->job_id = NULL; |
| } |
| if (!backup->has_auto_finalize) { |
| backup->auto_finalize = true; |
| } |
| if (!backup->has_auto_dismiss) { |
| backup->auto_dismiss = true; |
| } |
| if (!backup->has_compress) { |
| backup->compress = false; |
| } |
| |
| if (backup->x_perf) { |
| if (backup->x_perf->has_use_copy_range) { |
| perf.use_copy_range = backup->x_perf->use_copy_range; |
| } |
| if (backup->x_perf->has_max_workers) { |
| perf.max_workers = backup->x_perf->max_workers; |
| } |
| if (backup->x_perf->has_max_chunk) { |
| perf.max_chunk = backup->x_perf->max_chunk; |
| } |
| } |
| |
| if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) || |
| (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) { |
| /* done before desugaring 'incremental' to print the right message */ |
| if (!backup->has_bitmap) { |
| error_setg(errp, "must provide a valid bitmap name for " |
| "'%s' sync mode", MirrorSyncMode_str(backup->sync)); |
| return NULL; |
| } |
| } |
| |
| if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) { |
| if (backup->has_bitmap_mode && |
| backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) { |
| error_setg(errp, "Bitmap sync mode must be '%s' " |
| "when using sync mode '%s'", |
| BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS), |
| MirrorSyncMode_str(backup->sync)); |
| return NULL; |
| } |
| backup->has_bitmap_mode = true; |
| backup->sync = MIRROR_SYNC_MODE_BITMAP; |
| backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS; |
| } |
| |
| if (backup->has_bitmap) { |
| bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap); |
| if (!bmap) { |
| error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap); |
| return NULL; |
| } |
| if (!backup->has_bitmap_mode) { |
| error_setg(errp, "Bitmap sync mode must be given " |
| "when providing a bitmap"); |
| return NULL; |
| } |
| if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) { |
| return NULL; |
| } |
| |
| /* This does not produce a useful bitmap artifact: */ |
| if (backup->sync == MIRROR_SYNC_MODE_NONE) { |
| error_setg(errp, "sync mode '%s' does not produce meaningful bitmap" |
| " outputs", MirrorSyncMode_str(backup->sync)); |
| return NULL; |
| } |
| |
| /* If the bitmap isn't used for input or output, this is useless: */ |
| if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER && |
| backup->sync != MIRROR_SYNC_MODE_BITMAP) { |
| error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect" |
| " when combined with sync mode '%s'", |
| BitmapSyncMode_str(backup->bitmap_mode), |
| MirrorSyncMode_str(backup->sync)); |
| return NULL; |
| } |
| } |
| |
| if (!backup->has_bitmap && backup->has_bitmap_mode) { |
| error_setg(errp, "Cannot specify bitmap sync mode without a bitmap"); |
| return NULL; |
| } |
| |
| if (!backup->auto_finalize) { |
| job_flags |= JOB_MANUAL_FINALIZE; |
| } |
| if (!backup->auto_dismiss) { |
| job_flags |= JOB_MANUAL_DISMISS; |
| } |
| |
| job = backup_job_create(backup->job_id, bs, target_bs, backup->speed, |
| backup->sync, bmap, backup->bitmap_mode, |
| backup->compress, |
| backup->filter_node_name, |
| &perf, |
| backup->on_source_error, |
| backup->on_target_error, |
| job_flags, NULL, NULL, txn, errp); |
| return job; |
| } |
| |
| void qmp_drive_backup(DriveBackup *backup, Error **errp) |
| { |
| TransactionAction action = { |
| .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP, |
| .u.drive_backup.data = backup, |
| }; |
| blockdev_do_action(&action, errp); |
| } |
| |
| BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat, |
| bool flat, |
| Error **errp) |
| { |
| bool return_flat = has_flat && flat; |
| |
| return bdrv_named_nodes_list(return_flat, errp); |
| } |
| |
| XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp) |
| { |
| return bdrv_get_xdbg_block_graph(errp); |
| } |
| |
| void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp) |
| { |
| TransactionAction action = { |
| .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP, |
| .u.blockdev_backup.data = backup, |
| }; |
| blockdev_do_action(&action, errp); |
| } |
| |
| /* Parameter check and block job starting for drive mirroring. |
| * Caller should hold @device and @target's aio context (must be the same). |
| **/ |
| static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, |
| BlockDriverState *target, |
| bool has_replaces, const char *replaces, |
| enum MirrorSyncMode sync, |
| BlockMirrorBackingMode backing_mode, |
| bool zero_target, |
| bool has_speed, int64_t speed, |
| bool has_granularity, uint32_t granularity, |
| bool has_buf_size, int64_t buf_size, |
| bool has_on_source_error, |
| BlockdevOnError on_source_error, |
| bool has_on_target_error, |
| BlockdevOnError on_target_error, |
| bool has_unmap, bool unmap, |
| bool has_filter_node_name, |
| const char *filter_node_name, |
| bool has_copy_mode, MirrorCopyMode copy_mode, |
| bool has_auto_finalize, bool auto_finalize, |
| bool has_auto_dismiss, bool auto_dismiss, |
| Error **errp) |
| { |
| BlockDriverState *unfiltered_bs; |
| int job_flags = JOB_DEFAULT; |
| |
| if (!has_speed) { |
| speed = 0; |
| } |
| if (!has_on_source_error) { |
| on_source_error = BLOCKDEV_ON_ERROR_REPORT; |
| } |
| if (!has_on_target_error) { |
| on_target_error = BLOCKDEV_ON_ERROR_REPORT; |
| } |
| if (!has_granularity) { |
| granularity = 0; |
| } |
| if (!has_buf_size) { |
| buf_size = 0; |
| } |
| if (!has_unmap) { |
| unmap = true; |
| } |
| if (!has_filter_node_name) { |
| filter_node_name = NULL; |
| } |
| if (!has_copy_mode) { |
| copy_mode = MIRROR_COPY_MODE_BACKGROUND; |
| } |
| if (has_auto_finalize && !auto_finalize) { |
| job_flags |= JOB_MANUAL_FINALIZE; |
| } |
| if (has_auto_dismiss && !auto_dismiss) { |
| job_flags |= JOB_MANUAL_DISMISS; |
| } |
| |
| if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { |
| error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", |
| "a value in range [512B, 64MB]"); |
| return; |
| } |
| if (granularity & (granularity - 1)) { |
| error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", |
| "a power of 2"); |
| return; |
| } |
| |
| if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { |
| return; |
| } |
| if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) { |
| return; |
| } |
| |
| if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) { |
| sync = MIRROR_SYNC_MODE_FULL; |
| } |
| |
| if (!has_replaces) { |
| /* We want to mirror from @bs, but keep implicit filters on top */ |
| unfiltered_bs = bdrv_skip_implicit_filters(bs); |
| if (unfiltered_bs != bs) { |
| replaces = unfiltered_bs->node_name; |
| has_replaces = true; |
| } |
| } |
| |
| if (has_replaces) { |
| BlockDriverState *to_replace_bs; |
| AioContext *replace_aio_context; |
| int64_t bs_size, replace_size; |
| |
| bs_size = bdrv_getlength(bs); |
| if (bs_size < 0) { |
| error_setg_errno(errp, -bs_size, "Failed to query device's size"); |
| return; |
| } |
| |
| to_replace_bs = check_to_replace_node(bs, replaces, errp); |
| if (!to_replace_bs) { |
| return; |
| } |
| |
| replace_aio_context = bdrv_get_aio_context(to_replace_bs); |
| aio_context_acquire(replace_aio_context); |
| replace_size = bdrv_getlength(to_replace_bs); |
| aio_context_release(replace_aio_context); |
| |
| if (replace_size < 0) { |
| error_setg_errno(errp, -replace_size, |
| "Failed to query the replacement node's size"); |
| return; |
| } |
| if (bs_size != replace_size) { |
| error_setg(errp, "cannot replace image with a mirror image of " |
| "different size"); |
| return; |
| } |
| } |
| |
| /* pass the node name to replace to mirror start since it's loose coupling |
| * and will allow to check whether the node still exist at mirror completion |
| */ |
| mirror_start(job_id, bs, target, |
| has_replaces ? replaces : NULL, job_flags, |
| speed, granularity, buf_size, sync, backing_mode, zero_target, |
| on_source_error, on_target_error, unmap, filter_node_name, |
| copy_mode, errp); |
| } |
| |
| void qmp_drive_mirror(DriveMirror *arg, Error **errp) |
| { |
| BlockDriverState *bs; |
| BlockDriverState *target_backing_bs, *target_bs; |
| AioContext *aio_context; |
| AioContext *old_context; |
| BlockMirrorBackingMode backing_mode; |
| Error *local_err = NULL; |
| QDict *options = NULL; |
| int flags; |
| int64_t size; |
| const char *format = arg->format; |
| bool zero_target; |
| int ret; |
| |
| bs = qmp_get_root_bs(arg->device, errp); |
| if (!bs) { |
| return; |
| } |
| |
| /* Early check to avoid creating target */ |
| if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) { |
| return; |
| } |
| |
| aio_context = bdrv_get_aio_context(bs); |
| aio_context_acquire(aio_context); |
| |
| if (!arg->has_mode) { |
| arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; |
| } |
| |
| if (!arg->has_format) { |
| format = (arg->mode == NEW_IMAGE_MODE_EXISTING |
| ? NULL : bs->drv->format_name); |
| } |
| |
| flags = bs->open_flags | BDRV_O_RDWR; |
| target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs)); |
| if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) { |
| arg->sync = MIRROR_SYNC_MODE_FULL; |
| } |
| if (arg->sync == MIRROR_SYNC_MODE_NONE) { |
| target_backing_bs = bs; |
| } |
| |
| size = bdrv_getlength(bs); |
| if (size < 0) { |
| error_setg_errno(errp, -size, "bdrv_getlength failed"); |
| goto out; |
| } |
| |
| if (arg->has_replaces) { |
| if (!arg->has_node_name) { |
| error_setg(errp, "a node-name must be provided when replacing a" |
| " named node of the graph"); |
| goto out; |
| } |
| } |
| |
| if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) { |
| backing_mode = MIRROR_SOURCE_BACKING_CHAIN; |
| } else { |
| backing_mode = MIRROR_OPEN_BACKING_CHAIN; |
| } |
| |
| /* Don't open backing image in create() */ |
| flags |= BDRV_O_NO_BACKING; |
| |
| if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs) |
| && arg->mode != NEW_IMAGE_MODE_EXISTING) |
| { |
| /* create new image w/o backing file */ |
| assert(format); |
| bdrv_img_create(arg->target, format, |
| NULL, NULL, NULL, size, flags, false, &local_err); |
| } else { |
| /* Implicit filters should not appear in the filename */ |
| BlockDriverState *explicit_backing = |
| bdrv_skip_implicit_filters(target_backing_bs); |
| |
| switch (arg->mode) { |
| case NEW_IMAGE_MODE_EXISTING: |
| break; |
| case NEW_IMAGE_MODE_ABSOLUTE_PATHS: |
| /* create new image with backing file */ |
| bdrv_refresh_filename(explicit_backing); |
| bdrv_img_create(arg->target, format, |
| explicit_backing->filename, |
| explicit_backing->drv->format_name, |
| NULL, size, flags, false, &local_err); |
| break; |
| default: |
| abort(); |
| } |
| } |
| |
| if (local_err) { |
| error_propagate(errp, local_err); |
| goto out; |
| } |
| |
| options = qdict_new(); |
| if (arg->has_node_name) { |
| qdict_put_str(options, "node-name", arg->node_name); |
| } |
| if (format) { |
| qdict_put_str(options, "driver", format); |
| } |
| |
| /* Mirroring takes care of copy-on-write using the source's backing |
| * file. |
| */ |
| target_bs = bdrv_open(arg->target, NULL, options, flags, errp); |
| if (!target_bs) { |
| goto out; |
| } |
| |
| zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL && |
| (arg->mode == NEW_IMAGE_MODE_EXISTING || |
| !bdrv_has_zero_init(target_bs))); |
| |
| |
| /* Honor bdrv_try_set_aio_context() context acquisition requirements. */ |
| old_context = bdrv_get_aio_context(target_bs); |
| aio_context_release(aio_context); |
| aio_context_acquire(old_context); |
| |
| ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); |
| if (ret < 0) { |
| bdrv_unref(target_bs); |
| aio_context_release(old_context); |
| return; |
| } |
| |
| aio_context_release(old_context); |
| aio_context_acquire(aio_context); |
| |
| blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs, |
| arg->has_replaces, arg->replaces, arg->sync, |
| backing_mode, zero_target, |
| arg->has_speed, arg->speed, |
| arg->has_granularity, arg->granularity, |
| arg->has_buf_size, arg->buf_size, |
| arg->has_on_source_error, arg->on_source_error, |
| arg->has_on_target_error, arg->on_target_error, |
| arg->has_unmap, arg->unmap, |
| false, NULL, |
| arg->has_copy_mode, arg->copy_mode, |
| arg->has_auto_finalize, arg->auto_finalize, |
| arg->has_auto_dismiss, arg->auto_dismiss, |
| errp); |
| bdrv_unref(target_bs); |
| out: |
| aio_context_release(aio_context); |
| } |
| |
| void qmp_blockdev_mirror(bool has_job_id, const char *job_id, |
| const char *device, const char *target, |
| bool has_replaces, const char *replaces, |
| MirrorSyncMode sync, |
| bool has_speed, int64_t speed, |
| bool has_granularity, uint32_t granularity, |
| bool has_buf_size, int64_t buf_size, |
| bool has_on_source_error, |
| BlockdevOnError on_source_error, |
| bool has_on_target_error, |
| BlockdevOnError on_target_error, |
| bool has_filter_node_name, |
| const char *filter_node_name, |
| bool has_copy_mode, MirrorCopyMode copy_mode, |
| bool has_auto_finalize, bool auto_finalize, |
| bool has_auto_dismiss, bool auto_dismiss, |
| Error **errp) |
| { |
| BlockDriverState *bs; |
| BlockDriverState *target_bs; |
| AioContext *aio_context; |
| AioContext *old_context; |
| BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN; |
| bool zero_target; |
| int ret; |
| |
| bs = qmp_get_root_bs(device, errp); |
| if (!bs) { |
| return; |
| } |
| |
| target_bs = bdrv_lookup_bs(target, target, errp); |
| if (!target_bs) { |
| return; |
| } |
| |
| zero_target = (sync == MIRROR_SYNC_MODE_FULL); |
| |
| /* Honor bdrv_try_set_aio_context() context acquisition requirements. */ |
| old_context = bdrv_get_aio_context(target_bs); |
| aio_context = bdrv_get_aio_context(bs); |
| aio_context_acquire(old_context); |
| |
| ret = bdrv_try_set_aio_context(target_bs, aio_context, errp); |
| |
| aio_context_release(old_context); |
| aio_context_acquire(aio_context); |
| |
| if (ret < 0) { |
| goto out; |
| } |
| |
| blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs, |
| has_replaces, replaces, sync, backing_mode, |
| zero_target, has_speed, speed, |
| has_granularity, granularity, |
| has_buf_size, buf_size, |
| has_on_source_error, on_source_error, |
| has_on_target_error, on_target_error, |
| true, true, |
| has_filter_node_name, filter_node_name, |
| has_copy_mode, copy_mode, |
| has_auto_finalize, auto_finalize, |
| has_auto_dismiss, auto_dismiss, |
| errp); |
| out: |
| aio_context_release(aio_context); |
| } |
| |
| /* Get a block job using its ID and acquire its AioContext */ |
| static BlockJob *find_block_job(const char *id, AioContext **aio_context, |
| Error **errp) |
| { |
| BlockJob *job; |
| |
| assert(id != NULL); |
| |
| *aio_context = NULL; |
| |
| job = block_job_get(id); |
| |
| if (!job) { |
| error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, |
| "Block job '%s' not found", id); |
| return NULL; |
| } |
| |
| *aio_context = blk_get_aio_context(job->blk); |
| aio_context_acquire(*aio_context); |
| |
| return job; |
| } |
| |
| void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) |
| { |
| AioContext *aio_context; |
| BlockJob *job = find_block_job(device, &aio_context, errp); |
| |
| if (!job) { |
| return; |
| } |
| |
| block_job_set_speed(job, speed, errp); |
| aio_context_release(aio_context); |
| } |
| |
| void qmp_block_job_cancel(const char *device, |
| bool has_force, bool force, Error **errp) |
| { |
| AioContext *aio_context; |
| BlockJob *job = find_block_job(device, &aio_context, errp); |
| |
| if (!job) { |
| return; |
| } |
| |
| if (!has_force) { |
| force = false; |
| } |
| |
| if (job_user_paused(&job->job) && !force) { |
| error_setg(errp, "The block job for device '%s' is currently paused", |
| device); |
| goto out; |
| } |
| |
| trace_qmp_block_job_cancel(job); |
| job_user_cancel(&job->job, force, errp); |
| out: |
| aio_context_release(aio_context); |
| } |
| |
| void qmp_block_job_pause(const char *device, Error **errp) |
| { |
| AioContext *aio_context; |
| BlockJob *job = find_block_job(device, &aio_context, errp); |
| |
| if (!job) { |
| return; |
| } |
| |
| trace_qmp_block_job_pause(job); |
| job_user_pause(&job->job, errp); |
| aio_context_release(aio_context); |
| } |
| |
| void qmp_block_job_resume(const char *device, Error **errp) |
| { |
| AioContext *aio_context; |
| BlockJob *job = find_block_job(device, &aio_context, errp); |
| |
| if (!job) { |
| return; |
| } |
| |
| trace_qmp_block_job_resume(job); |
| job_user_resume(&job->job, errp); |
| aio_context_release(aio_context); |
| } |
| |
| void qmp_block_job_complete(const char *device, Error **errp) |
| { |
| AioContext *aio_context; |
| BlockJob *job = find_block_job(device, &aio_context, errp); |
| |
| if (!job) { |
| return; |
| } |
| |
| trace_qmp_block_job_complete(job); |
| job_complete(&job->job, errp); |
| aio_context_release(aio_context); |
| } |
| |
| void qmp_block_job_finalize(const char *id, Error **errp) |
| { |
| AioContext *aio_context; |
| BlockJob *job = find_block_job(id, &aio_context, errp); |
| |
| if (!job) { |
| return; |
| } |
| |
| trace_qmp_block_job_finalize(job); |
| job_ref(&job->job); |
| job_finalize(&job->job, errp); |
| |
| /* |
| * Job's context might have changed via job_finalize (and job_txn_apply |
| * automatically acquires the new one), so make sure we release the correct |
| * one. |
| */ |
| aio_context = blk_get_aio_context(job->blk); |
| job_unref(&job->job); |
| aio_context_release(aio_context); |
| } |
| |
| void qmp_block_job_dismiss(const char *id, Error **errp) |
| { |
| AioContext *aio_context; |
| BlockJob *bjob = find_block_job(id, &aio_context, errp); |
| Job *job; |
| |
| if (!bjob) { |
| return; |
| } |
| |
| trace_qmp_block_job_dismiss(bjob); |
| job = &bjob->job; |
| job_dismiss(&job, errp); |
| aio_context_release(aio_context); |
| } |
| |
| void qmp_change_backing_file(const char *device, |
| const char *image_node_name, |
| const char *backing_file, |
| Error **errp) |
| { |
| BlockDriverState *bs = NULL; |
| AioContext *aio_context; |
| BlockDriverState *image_bs = NULL; |
| Error *local_err = NULL; |
| bool ro; |
| int ret; |
| |
| bs = qmp_get_root_bs(device, errp); |
| if (!bs) { |
| return; |
| } |
| |
| aio_context = bdrv_get_aio_context(bs); |
| aio_context_acquire(aio_context); |
| |
| image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| goto out; |
| } |
| |
| if (!image_bs) { |
| error_setg(errp, "image file not found"); |
| goto out; |
| } |
| |
| if (bdrv_find_base(image_bs) == image_bs) { |
| error_setg(errp, "not allowing backing file change on an image " |
| "without a backing file"); |
| goto out; |
| } |
| |
| /* even though we are not necessarily operating on bs, we need it to |
| * determine if block ops are currently prohibited on the chain */ |
| if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { |
| goto out; |
| } |
| |
| /* final sanity check */ |
| if (!bdrv_chain_contains(bs, image_bs)) { |
| error_setg(errp, "'%s' and image file are not in the same chain", |
| device); |
| goto out; |
| } |
| |
| /* if not r/w, reopen to make r/w */ |
| ro = bdrv_is_read_only(image_bs); |
| |
| if (ro) { |
| if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) { |
| goto out; |
| } |
| } |
| |
| ret = bdrv_change_backing_file(image_bs, backing_file, |
| image_bs->drv ? image_bs->drv->format_name : "", |
| false); |
| |
| if (ret < 0) { |
| error_setg_errno(errp, -ret, "Could not change backing file to '%s'", |
| backing_file); |
| /* don't exit here, so we can try to restore open flags if |
| * appropriate */ |
| } |
| |
| if (ro) { |
| bdrv_reopen_set_read_only(image_bs, true, errp); |
| } |
| |
| out: |
| aio_context_release(aio_context); |
| } |
| |
| void qmp_blockdev_add(BlockdevOptions *options, Error **errp) |
| { |
| BlockDriverState *bs; |
| QObject *obj; |
| Visitor *v = qobject_output_visitor_new(&obj); |
| QDict *qdict; |
| |
| visit_type_BlockdevOptions(v, NULL, &options, &error_abort); |
| visit_complete(v, &obj); |
| qdict = qobject_to(QDict, obj); |
| |
| qdict_flatten(qdict); |
| |
| if (!qdict_get_try_str(qdict, "node-name")) { |
| error_setg(errp, "'node-name' must be specified for the root node"); |
| goto fail; |
| } |
| |
| bs = bds_tree_init(qdict, errp); |
| if (!bs) { |
| goto fail; |
| } |
| |
| bdrv_set_monitor_owned(bs); |
| |
| fail: |
| visit_free(v); |
| } |
| |
| void qmp_x_blockdev_reopen(BlockdevOptions *options, Error **errp) |
| { |
| BlockDriverState *bs; |
| AioContext *ctx; |
| QObject *obj; |
| Visitor *v = qobject_output_visitor_new(&obj); |
| BlockReopenQueue *queue; |
| QDict *qdict; |
| |
| /* Check for the selected node name */ |
| if (!options->has_node_name) { |
| error_setg(errp, "node-name not specified"); |
| goto fail; |
| } |
| |
| bs = bdrv_find_node(options->node_name); |
| if (!bs) { |
| error_setg(errp, "Failed to find node with node-name='%s'", |
| options->node_name); |
| goto fail; |
| } |
| |
| /* Put all options in a QDict and flatten it */ |
| visit_type_BlockdevOptions(v, NULL, &options, &error_abort); |
| visit_complete(v, &obj); |
| qdict = qobject_to(QDict, obj); |
| |
| qdict_flatten(qdict); |
| |
| /* Perform the reopen operation */ |
| ctx = bdrv_get_aio_context(bs); |
| aio_context_acquire(ctx); |
| bdrv_subtree_drained_begin(bs); |
| queue = bdrv_reopen_queue(NULL, bs, qdict, false); |
| bdrv_reopen_multiple(queue, errp); |
| bdrv_subtree_drained_end(bs); |
| aio_context_release(ctx); |
| |
| fail: |
| visit_free(v); |
| } |
| |
| void qmp_blockdev_del(const char *node_name, Error **errp) |
| { |
| AioContext *aio_context; |
| BlockDriverState *bs; |
| |
| bs = bdrv_find_node(node_name); |
| if (!bs) { |
| error_setg(errp, "Failed to find node with node-name='%s'", node_name); |
| return; |
| } |
| if (bdrv_has_blk(bs)) { |
| error_setg(errp, "Node %s is in use", node_name); |
| return; |
| } |
| aio_context = bdrv_get_aio_context(bs); |
| aio_context_acquire(aio_context); |
| |
| if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) { |
| goto out; |
| } |
| |
| if (!QTAILQ_IN_USE(bs, monitor_list)) { |
| error_setg(errp, "Node %s is not owned by the monitor", |
| bs->node_name); |
| goto out; |
| } |
| |
| if (bs->refcnt > 1) { |
| error_setg(errp, "Block device %s is in use", |
| bdrv_get_device_or_node_name(bs)); |
| goto out; |
| } |
| |
| QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list); |
| bdrv_unref(bs); |
| |
| out: |
| aio_context_release(aio_context); |
| } |
| |
| static BdrvChild *bdrv_find_child(BlockDriverState *parent_bs, |
| const char *child_name) |
| { |
| BdrvChild *child; |
| |
| QLIST_FOREACH(child, &parent_bs->children, next) { |
| if (strcmp(child->name, child_name) == 0) { |
| return child; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| void qmp_x_blockdev_change(const char *parent, bool has_child, |
| const char *child, bool has_node, |
| const char *node, Error **errp) |
| { |
| BlockDriverState *parent_bs, *new_bs = NULL; |
| BdrvChild *p_child; |
| |
| parent_bs = bdrv_lookup_bs(parent, parent, errp); |
| if (!parent_bs) { |
| return; |
| } |
| |
| if (has_child == has_node) { |
| if (has_child) { |
| error_setg(errp, "The parameters child and node are in conflict"); |
| } else { |
| error_setg(errp, "Either child or node must be specified"); |
| } |
| return; |
| } |
| |
| if (has_child) { |
| p_child = bdrv_find_child(parent_bs, child); |
| if (!p_child) { |
| error_setg(errp, "Node '%s' does not have child '%s'", |
| parent, child); |
| return; |
| } |
| bdrv_del_child(parent_bs, p_child, errp); |
| } |
| |
| if (has_node) { |
| new_bs = bdrv_find_node(node); |
| if (!new_bs) { |
| error_setg(errp, "Node '%s' not found", node); |
| return; |
| } |
| bdrv_add_child(parent_bs, new_bs, errp); |
| } |
| } |
| |
| BlockJobInfoList *qmp_query_block_jobs(Error **errp) |
| { |
| BlockJobInfoList *head = NULL, **tail = &head; |
| BlockJob *job; |
| |
| for (job = block_job_next(NULL); job; job = block_job_next(job)) { |
| BlockJobInfo *value; |
| AioContext *aio_context; |
| |
| if (block_job_is_internal(job)) { |
| continue; |
| } |
| aio_context = blk_get_aio_context(job->blk); |
| aio_context_acquire(aio_context); |
| value = block_job_query(job, errp); |
| aio_context_release(aio_context); |
| if (!value) { |
| qapi_free_BlockJobInfoList(head); |
| return NULL; |
| } |
| QAPI_LIST_APPEND(tail, value); |
| } |
| |
| return head; |
| } |
| |
| void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread, |
| bool has_force, bool force, Error **errp) |
| { |
| AioContext *old_context; |
| AioContext *new_context; |
| BlockDriverState *bs; |
| |
| bs = bdrv_find_node(node_name); |
| if (!bs) { |
| error_setg(errp, "Failed to find node with node-name='%s'", node_name); |
| return; |
| } |
| |
| /* Protects against accidents. */ |
| if (!(has_force && force) && bdrv_has_blk(bs)) { |
| error_setg(errp, "Node %s is associated with a BlockBackend and could " |
| "be in use (use force=true to override this check)", |
| node_name); |
| return; |
| } |
| |
| if (iothread->type == QTYPE_QSTRING) { |
| IOThread *obj = iothread_by_id(iothread->u.s); |
| if (!obj) { |
| error_setg(errp, "Cannot find iothread %s", iothread->u.s); |
| return; |
| } |
| |
| new_context = iothread_get_aio_context(obj); |
| } else { |
| new_context = qemu_get_aio_context(); |
| } |
| |
| old_context = bdrv_get_aio_context(bs); |
| aio_context_acquire(old_context); |
| |
| bdrv_try_set_aio_context(bs, new_context, errp); |
| |
| aio_context_release(old_context); |
| } |
| |
| QemuOptsList qemu_common_drive_opts = { |
| .name = "drive", |
| .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), |
| .desc = { |
| { |
| .name = "snapshot", |
| .type = QEMU_OPT_BOOL, |
| .help = "enable/disable snapshot mode", |
| },{ |
| .name = "aio", |
| .type = QEMU_OPT_STRING, |
| .help = "host AIO implementation (threads, native, io_uring)", |
| },{ |
| .name = BDRV_OPT_CACHE_WB, |
| .type = QEMU_OPT_BOOL, |
| .help = "Enable writeback mode", |
| },{ |
| .name = "format", |
| .type = QEMU_OPT_STRING, |
| .help = "disk format (raw, qcow2, ...)", |
| },{ |
| .name = "rerror", |
| .type = QEMU_OPT_STRING, |
| .help = "read error action", |
| },{ |
| .name = "werror", |
| .type = QEMU_OPT_STRING, |
| .help = "write error action", |
| },{ |
| .name = BDRV_OPT_READ_ONLY, |
| .type = QEMU_OPT_BOOL, |
| .help = "open drive file as read-only", |
| }, |
| |
| THROTTLE_OPTS, |
| |
| { |
| .name = "throttling.group", |
| .type = QEMU_OPT_STRING, |
| .help = "name of the block throttling group", |
| },{ |
| .name = "copy-on-read", |
| .type = QEMU_OPT_BOOL, |
| .help = "copy read data from backing file into image file", |
| },{ |
| .name = "detect-zeroes", |
| .type = QEMU_OPT_STRING, |
| .help = "try to optimize zero writes (off, on, unmap)", |
| },{ |
| .name = "stats-account-invalid", |
| .type = QEMU_OPT_BOOL, |
| .help = "whether to account for invalid I/O operations " |
| "in the statistics", |
| },{ |
| .name = "stats-account-failed", |
| .type = QEMU_OPT_BOOL, |
| .help = "whether to account for failed I/O operations " |
| "in the statistics", |
| }, |
| { /* end of list */ } |
| }, |
| }; |
| |
| QemuOptsList qemu_drive_opts = { |
| .name = "drive", |
| .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), |
| .desc = { |
| /* |
| * no elements => accept any params |
| * validation will happen later |
| */ |
| { /* end of list */ } |
| }, |
| }; |