/* * 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); } 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 */ } }, };