/* * 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 "sysemu/block-backend.h" #include "sysemu/blockdev.h" #include "hw/block/block.h" #include "block/blockjob.h" #include "monitor/monitor.h" #include "qemu/option.h" #include "qemu/config-file.h" #include "qapi/qmp/types.h" #include "qapi-visit.h" #include "qapi/qmp-output-visitor.h" #include "qapi/util.h" #include "sysemu/sysemu.h" #include "block/block_int.h" #include "qmp-commands.h" #include "trace.h" #include "sysemu/arch_init.h" 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 imlement 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); BlockDriverState *bs = blk_bs(blk); AioContext *aio_context; if (!dinfo) { return; } aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); if (bs->job) { block_job_cancel(bs->job); } 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) { 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(qemu_find_opts("drive"), optstr, 0); } QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, const char *optstr) { QemuOpts *opts; char buf[32]; opts = drive_def(optstr); if (!opts) { return NULL; } if (type != IF_DEFAULT) { qemu_opt_set(opts, "if", if_name[type]); } if (index >= 0) { snprintf(buf, sizeof(buf), "%d", index); qemu_opt_set(opts, "index", buf); } if (file) qemu_opt_set(opts, "file", file); 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; } bool drive_check_orphaned(void) { BlockBackend *blk; DriveInfo *dinfo; bool rs = false; for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { dinfo = blk_legacy_dinfo(blk); /* If dinfo->bdrv->dev is NULL, it has no device attached. */ /* Unless this is a default drive, this may be an oversight. */ if (!blk_get_attached_dev(blk) && !dinfo->is_default && dinfo->type != IF_NONE) { fprintf(stderr, "Warning: Orphaned drive without device: " "id=%s,file=%s,if=%s,bus=%d,unit=%d\n", blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type], dinfo->bus, dinfo->unit); rs = true; } } return rs; } 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) { error_printf(" %s", name); } typedef struct { QEMUBH *bh; BlockDriverState *bs; } BDRVPutRefBH; static void bdrv_put_ref_bh(void *opaque) { BDRVPutRefBH *s = opaque; bdrv_unref(s->bs); qemu_bh_delete(s->bh); g_free(s); } /* * Release a BDS reference in a BH * * It is not safe to use bdrv_unref() from a callback function when the callers * still need the BlockDriverState. In such cases we schedule a BH to release * the reference. */ static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) { BDRVPutRefBH *s; s = g_new(BDRVPutRefBH, 1); s->bh = qemu_bh_new(bdrv_put_ref_bh, s); s->bs = bs; qemu_bh_schedule(s->bh); } 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 check_throttle_config(ThrottleConfig *cfg, Error **errp) { if (throttle_conflicting(cfg)) { error_setg(errp, "bps/iops/max total values and read/write values" " cannot be used at the same time"); return false; } if (!throttle_is_valid(cfg)) { error_setg(errp, "bps/iops/maxs values must be 0 or greater"); return false; } return true; } typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; /* Takes the ownership of bs_opts */ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, Error **errp) { const char *buf; int ro = 0; int bdrv_flags = 0; int on_read_error, on_write_error; BlockBackend *blk; BlockDriverState *bs; ThrottleConfig cfg; int snapshot = 0; bool copy_on_read; int ret; Error *error = NULL; QemuOpts *opts; const char *id; bool has_driver_specific_opts; BlockdevDetectZeroesOptions detect_zeroes; BlockDriver *drv = 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, &error); if (error) { error_propagate(errp, error); goto err_no_opts; } qemu_opts_absorb_qdict(opts, bs_opts, &error); if (error) { error_propagate(errp, error); goto early_err; } if (id) { qdict_del(bs_opts, "id"); } has_driver_specific_opts = !!qdict_size(bs_opts); /* extract parameters */ snapshot = qemu_opt_get_bool(opts, "snapshot", 0); ro = qemu_opt_get_bool(opts, "read-only", 0); copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); if ((buf = qemu_opt_get(opts, "discard")) != NULL) { if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { error_setg(errp, "invalid discard option"); goto early_err; } } if (qemu_opt_get_bool(opts, "cache.writeback", true)) { bdrv_flags |= BDRV_O_CACHE_WB; } if (qemu_opt_get_bool(opts, "cache.direct", false)) { bdrv_flags |= BDRV_O_NOCACHE; } if (qemu_opt_get_bool(opts, "cache.no-flush", false)) { bdrv_flags |= BDRV_O_NO_FLUSH; } #ifdef CONFIG_LINUX_AIO if ((buf = qemu_opt_get(opts, "aio")) != NULL) { if (!strcmp(buf, "native")) { bdrv_flags |= BDRV_O_NATIVE_AIO; } else if (!strcmp(buf, "threads")) { /* this is the default */ } else { error_setg(errp, "invalid aio option"); goto early_err; } } #endif if ((buf = qemu_opt_get(opts, "format")) != NULL) { if (is_help_option(buf)) { error_printf("Supported formats:"); bdrv_iterate_format(bdrv_format_print, NULL); error_printf("\n"); goto early_err; } drv = bdrv_find_format(buf); if (!drv) { error_setg(errp, "'%s' invalid format", buf); goto early_err; } } /* disk I/O throttling */ memset(&cfg, 0, sizeof(cfg)); cfg.buckets[THROTTLE_BPS_TOTAL].avg = qemu_opt_get_number(opts, "throttling.bps-total", 0); cfg.buckets[THROTTLE_BPS_READ].avg = qemu_opt_get_number(opts, "throttling.bps-read", 0); cfg.buckets[THROTTLE_BPS_WRITE].avg = qemu_opt_get_number(opts, "throttling.bps-write", 0); cfg.buckets[THROTTLE_OPS_TOTAL].avg = qemu_opt_get_number(opts, "throttling.iops-total", 0); cfg.buckets[THROTTLE_OPS_READ].avg = qemu_opt_get_number(opts, "throttling.iops-read", 0); cfg.buckets[THROTTLE_OPS_WRITE].avg = qemu_opt_get_number(opts, "throttling.iops-write", 0); cfg.buckets[THROTTLE_BPS_TOTAL].max = qemu_opt_get_number(opts, "throttling.bps-total-max", 0); cfg.buckets[THROTTLE_BPS_READ].max = qemu_opt_get_number(opts, "throttling.bps-read-max", 0); cfg.buckets[THROTTLE_BPS_WRITE].max = qemu_opt_get_number(opts, "throttling.bps-write-max", 0); cfg.buckets[THROTTLE_OPS_TOTAL].max = qemu_opt_get_number(opts, "throttling.iops-total-max", 0); cfg.buckets[THROTTLE_OPS_READ].max = qemu_opt_get_number(opts, "throttling.iops-read-max", 0); cfg.buckets[THROTTLE_OPS_WRITE].max = qemu_opt_get_number(opts, "throttling.iops-write-max", 0); cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); if (!check_throttle_config(&cfg, &error)) { error_propagate(errp, error); goto early_err; } 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; } } detect_zeroes = qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, qemu_opt_get(opts, "detect-zeroes"), BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, &error); if (error) { error_propagate(errp, error); goto early_err; } if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && !(bdrv_flags & BDRV_O_UNMAP)) { error_setg(errp, "setting detect-zeroes to unmap is not allowed " "without setting discard operation to unmap"); goto early_err; } /* init */ blk = blk_new_with_bs(qemu_opts_id(opts), errp); if (!blk) { goto early_err; } bs = blk_bs(blk); bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; bs->read_only = ro; bs->detect_zeroes = detect_zeroes; bdrv_set_on_error(bs, on_read_error, on_write_error); /* disk I/O throttling */ if (throttle_enabled(&cfg)) { bdrv_io_limits_enable(bs); bdrv_set_io_limits(bs, &cfg); } if (!file || !*file) { if (has_driver_specific_opts) { file = NULL; } else { QDECREF(bs_opts); qemu_opts_del(opts); return blk; } } if (snapshot) { /* always use cache=unsafe with snapshot */ bdrv_flags &= ~BDRV_O_CACHE_MASK; bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); } if (copy_on_read) { bdrv_flags |= BDRV_O_COPY_ON_READ; } if (runstate_check(RUN_STATE_INMIGRATE)) { bdrv_flags |= BDRV_O_INCOMING; } bdrv_flags |= ro ? 0 : BDRV_O_RDWR; QINCREF(bs_opts); ret = bdrv_open(&bs, file, NULL, bs_opts, bdrv_flags, drv, &error); assert(bs == blk_bs(blk)); if (ret < 0) { error_setg(errp, "could not open disk image %s: %s", file ?: blk_name(blk), error_get_pretty(error)); error_free(error); goto err; } if (bdrv_key_required(bs)) { autostart = 0; } QDECREF(bs_opts); qemu_opts_del(opts); return blk; err: blk_unref(blk); early_err: qemu_opts_del(opts); err_no_opts: QDECREF(bs_opts); return NULL; } static void 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; } } /* rename all items in opts */ while ((value = qemu_opt_get(opts, from))) { qemu_opt_set(opts, to, value); qemu_opt_unset(opts, from); } } 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 = "cyls", .type = QEMU_OPT_NUMBER, .help = "number of cylinders (ide disk geometry)", },{ .name = "heads", .type = QEMU_OPT_NUMBER, .help = "number of heads (ide disk geometry)", },{ .name = "secs", .type = QEMU_OPT_NUMBER, .help = "number of sectors (ide disk geometry)", },{ .name = "trans", .type = QEMU_OPT_STRING, .help = "chs translation (auto, lba, none)", },{ .name = "boot", .type = QEMU_OPT_BOOL, .help = "(deprecated, ignored)", },{ .name = "addr", .type = QEMU_OPT_STRING, .help = "pci address (virtio only)", },{ .name = "serial", .type = QEMU_OPT_STRING, .help = "disk serial number", },{ .name = "file", .type = QEMU_OPT_STRING, .help = "file name", }, /* Options that are passed on, but have special semantics with -drive */ { .name = "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) { const char *value; BlockBackend *blk; DriveInfo *dinfo = NULL; QDict *bs_opts; QemuOpts *legacy_opts; DriveMediaType media = MEDIA_DISK; BlockInterfaceType type; int cyls, heads, secs, translation; int max_devs, bus_id, unit_id, index; const char *devaddr; const char *werror, *rerror; bool read_only = false; bool copy_on_read; const char *serial; const char *filename; Error *local_err = NULL; 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" }, { "readonly", "read-only" }, }; for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, &local_err); if (local_err) { error_report("%s", error_get_pretty(local_err)); error_free(local_err); return NULL; } } value = qemu_opt_get(all_opts, "cache"); if (value) { int flags = 0; if (bdrv_parse_cache_flags(value, &flags) != 0) { error_report("invalid cache option"); return NULL; } /* Specific options take precedence */ if (!qemu_opt_get(all_opts, "cache.writeback")) { qemu_opt_set_bool(all_opts, "cache.writeback", !!(flags & BDRV_O_CACHE_WB)); } if (!qemu_opt_get(all_opts, "cache.direct")) { qemu_opt_set_bool(all_opts, "cache.direct", !!(flags & BDRV_O_NOCACHE)); } if (!qemu_opt_get(all_opts, "cache.no-flush")) { qemu_opt_set_bool(all_opts, "cache.no-flush", !!(flags & BDRV_O_NO_FLUSH)); } 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); qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); if (local_err) { error_report("%s", error_get_pretty(local_err)); error_free(local_err); goto fail; } /* Deprecated option boot=[on|off] */ if (qemu_opt_get(legacy_opts, "boot") != NULL) { fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " "ignored. Future versions will reject this parameter. Please " "update your scripts.\n"); } /* 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_report("'%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, "read-only", false); copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); if (read_only && copy_on_read) { error_report("warning: disabling copy-on-read on read-only drive"); copy_on_read = false; } qdict_put(bs_opts, "read-only", qstring_from_str(read_only ? "on" : "off")); qdict_put(bs_opts, "copy-on-read", qstring_from_str(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_report("unsupported bus type '%s'", value); goto fail; } } else { type = block_default_type; } /* Geometry */ cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); heads = qemu_opt_get_number(legacy_opts, "heads", 0); secs = qemu_opt_get_number(legacy_opts, "secs", 0); if (cyls || heads || secs) { if (cyls < 1) { error_report("invalid physical cyls number"); goto fail; } if (heads < 1) { error_report("invalid physical heads number"); goto fail; } if (secs < 1) { error_report("invalid physical secs number"); goto fail; } } translation = BIOS_ATA_TRANSLATION_AUTO; value = qemu_opt_get(legacy_opts, "trans"); if (value != NULL) { if (!cyls) { error_report("'%s' trans must be used with cyls, heads and secs", value); goto fail; } if (!strcmp(value, "none")) { translation = BIOS_ATA_TRANSLATION_NONE; } else if (!strcmp(value, "lba")) { translation = BIOS_ATA_TRANSLATION_LBA; } else if (!strcmp(value, "large")) { translation = BIOS_ATA_TRANSLATION_LARGE; } else if (!strcmp(value, "rechs")) { translation = BIOS_ATA_TRANSLATION_RECHS; } else if (!strcmp(value, "auto")) { translation = BIOS_ATA_TRANSLATION_AUTO; } else { error_report("'%s' invalid translation type", value); goto fail; } } if (media == MEDIA_CDROM) { if (cyls || secs || heads) { error_report("CHS can't be set with media=cdrom"); goto fail; } } /* 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_report("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_report("unit %d too big (max is %d)", unit_id, max_devs - 1); goto fail; } if (drive_get(type, bus_id, unit_id) != NULL) { error_report("drive with bus=%d, unit=%d (index=%d) exists", bus_id, unit_id, index); goto fail; } /* Serial number */ serial = qemu_opt_get(legacy_opts, "serial"); /* 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(bs_opts, "id", qstring_from_str(new_id)); g_free(new_id); } /* Add virtio block device */ devaddr = qemu_opt_get(legacy_opts, "addr"); if (devaddr && type != IF_VIRTIO) { error_report("addr is not supported by this bus type"); goto fail; } 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-s390"); } else { qemu_opt_set(devopts, "driver", "virtio-blk-pci"); } qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id")); if (devaddr) { qemu_opt_set(devopts, "addr", devaddr); } } 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_report("werror is not supported by this bus type"); goto fail; } qdict_put(bs_opts, "werror", qstring_from_str(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_report("rerror is not supported by this bus type"); goto fail; } qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); } /* Actual block device init: Functionality shared with blockdev-add */ blk = blockdev_init(filename, bs_opts, &local_err); bs_opts = NULL; if (!blk) { if (local_err) { error_report("%s", error_get_pretty(local_err)); error_free(local_err); } goto fail; } else { assert(!local_err); } /* Create legacy DriveInfo */ dinfo = g_malloc0(sizeof(*dinfo)); dinfo->opts = all_opts; dinfo->cyls = cyls; dinfo->heads = heads; dinfo->secs = secs; dinfo->trans = translation; dinfo->type = type; dinfo->bus = bus_id; dinfo->unit = unit_id; dinfo->devaddr = devaddr; dinfo->serial = g_strdup(serial); 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); QDECREF(bs_opts); return dinfo; } void do_commit(Monitor *mon, const QDict *qdict) { const char *device = qdict_get_str(qdict, "device"); BlockDriverState *bs; int ret; if (!strcmp(device, "all")) { ret = bdrv_commit_all(); } else { bs = bdrv_find(device); if (!bs) { monitor_printf(mon, "Device '%s' not found\n", device); return; } ret = bdrv_commit(bs); } if (ret < 0) { monitor_printf(mon, "'commit' error for '%s': %s\n", device, strerror(-ret)); } } static void blockdev_do_action(int kind, void *data, Error **errp) { TransactionAction action; TransactionActionList list; action.kind = kind; action.data = data; list.value = &action; list.next = NULL; qmp_transaction(&list, 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) { BlockdevSnapshot 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, }; blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot, errp); } void qmp_blockdev_snapshot_internal_sync(const char *device, const char *name, Error **errp) { BlockdevSnapshotInternal snapshot = { .device = (char *) device, .name = (char *) name }; blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, &snapshot, 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 = bdrv_find(device); QEMUSnapshotInfo sn; Error *local_err = NULL; SnapshotInfo *info = NULL; int ret; if (!bs) { error_set(errp, QERR_DEVICE_NOT_FOUND, device); return NULL; } if (!has_id) { id = NULL; } if (!has_name) { name = NULL; } if (!id && !name) { error_setg(errp, "Name or id must be provided"); return NULL; } ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); if (local_err) { error_propagate(errp, local_err); return NULL; } 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); return NULL; } bdrv_snapshot_delete(bs, id, name, &local_err); if (local_err) { error_propagate(errp, local_err); return NULL; } 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; return info; } /* New and old BlockDriverState structs for group snapshots */ typedef struct BlkTransactionState BlkTransactionState; /* Only prepare() may fail. In a single transaction, only one of commit() or abort() will be called, clean() will always be called if it present. */ typedef struct BdrvActionOps { /* Size of state struct, in bytes. */ size_t instance_size; /* Prepare the work, must NOT be NULL. */ void (*prepare)(BlkTransactionState *common, Error **errp); /* Commit the changes, can be NULL. */ void (*commit)(BlkTransactionState *common); /* Abort the changes on fail, can be NULL. */ void (*abort)(BlkTransactionState *common); /* Clean up resource in the end, can be NULL. */ void (*clean)(BlkTransactionState *common); } BdrvActionOps; /* * This structure must be arranged as first member in child type, assuming * that compiler will also arrange it to the same address with parent instance. * Later it will be used in free(). */ struct BlkTransactionState { TransactionAction *action; const BdrvActionOps *ops; QSIMPLEQ_ENTRY(BlkTransactionState) entry; }; /* internal snapshot private data */ typedef struct InternalSnapshotState { BlkTransactionState common; BlockDriverState *bs; QEMUSnapshotInfo sn; } InternalSnapshotState; static void internal_snapshot_prepare(BlkTransactionState *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; int ret1; g_assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); internal = common->action->blockdev_snapshot_internal_sync; state = DO_UPCAST(InternalSnapshotState, common, common); /* 1. parse input */ device = internal->device; name = internal->name; /* 2. check for validation */ bs = bdrv_find(device); if (!bs) { error_set(errp, QERR_DEVICE_NOT_FOUND, device); return; } if (!bdrv_is_inserted(bs)) { error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); return; } if (bdrv_is_read_only(bs)) { error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); return; } if (!bdrv_can_snapshot(bs)) { error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, bs->drv->format_name, device, "internal snapshot"); return; } if (!strlen(name)) { error_setg(errp, "Name is empty"); return; } /* 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); return; } else if (ret) { error_setg(errp, "Snapshot with name '%s' already exists on device '%s'", name, device); return; } /* 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); ret1 = bdrv_snapshot_create(bs, sn); if (ret1 < 0) { error_setg_errno(errp, -ret1, "Failed to create snapshot '%s' on device '%s'", name, device); return; } /* 4. succeed, mark a snapshot is created */ state->bs = bs; } static void internal_snapshot_abort(BlkTransactionState *common) { InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, common, common); BlockDriverState *bs = state->bs; QEMUSnapshotInfo *sn = &state->sn; Error *local_error = NULL; if (!bs) { return; } if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { error_report("Failed to delete snapshot with id '%s' and name '%s' on " "device '%s' in abort: %s", sn->id_str, sn->name, bdrv_get_device_name(bs), error_get_pretty(local_error)); error_free(local_error); } } /* external snapshot private data */ typedef struct ExternalSnapshotState { BlkTransactionState common; BlockDriverState *old_bs; BlockDriverState *new_bs; } ExternalSnapshotState; static void external_snapshot_prepare(BlkTransactionState *common, Error **errp) { BlockDriver *drv; int flags, ret; QDict *options = NULL; Error *local_err = NULL; bool has_device = false; const char *device; bool has_node_name = false; const char *node_name; bool has_snapshot_node_name = false; const char *snapshot_node_name; const char *new_image_file; const char *format = "qcow2"; enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; ExternalSnapshotState *state = DO_UPCAST(ExternalSnapshotState, common, common); TransactionAction *action = common->action; /* get parameters */ g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); has_device = action->blockdev_snapshot_sync->has_device; device = action->blockdev_snapshot_sync->device; has_node_name = action->blockdev_snapshot_sync->has_node_name; node_name = action->blockdev_snapshot_sync->node_name; has_snapshot_node_name = action->blockdev_snapshot_sync->has_snapshot_node_name; snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; new_image_file = action->blockdev_snapshot_sync->snapshot_file; if (action->blockdev_snapshot_sync->has_format) { format = action->blockdev_snapshot_sync->format; } if (action->blockdev_snapshot_sync->has_mode) { mode = action->blockdev_snapshot_sync->mode; } /* start processing */ drv = bdrv_find_format(format); if (!drv) { error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); return; } state->old_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 (has_node_name && !has_snapshot_node_name) { error_setg(errp, "New snapshot node name missing"); return; } if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { error_setg(errp, "New snapshot node name already existing"); return; } if (!bdrv_is_inserted(state->old_bs)) { error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); return; } if (bdrv_op_is_blocked(state->old_bs, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { return; } if (!bdrv_is_read_only(state->old_bs)) { if (bdrv_flush(state->old_bs)) { error_set(errp, QERR_IO_ERROR); return; } } if (!bdrv_is_first_non_filter(state->old_bs)) { error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); return; } flags = state->old_bs->open_flags; /* create new image w/backing file */ if (mode != NEW_IMAGE_MODE_EXISTING) { bdrv_img_create(new_image_file, format, state->old_bs->filename, state->old_bs->drv->format_name, NULL, -1, flags, &local_err, false); if (local_err) { error_propagate(errp, local_err); return; } } if (has_snapshot_node_name) { options = qdict_new(); qdict_put(options, "node-name", qstring_from_str(snapshot_node_name)); } /* TODO Inherit bs->options or only take explicit options with an * extended QMP command? */ assert(state->new_bs == NULL); ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, flags | BDRV_O_NO_BACKING, drv, &local_err); /* We will manually add the backing_hd field to the bs later */ if (ret != 0) { error_propagate(errp, local_err); } } static void external_snapshot_commit(BlkTransactionState *common) { ExternalSnapshotState *state = DO_UPCAST(ExternalSnapshotState, common, common); /* This removes our old bs and adds the new bs */ bdrv_append(state->new_bs, state->old_bs); /* 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 */ bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, NULL); } static void external_snapshot_abort(BlkTransactionState *common) { ExternalSnapshotState *state = DO_UPCAST(ExternalSnapshotState, common, common); if (state->new_bs) { bdrv_unref(state->new_bs); } } typedef struct DriveBackupState { BlkTransactionState common; BlockDriverState *bs; BlockJob *job; } DriveBackupState; static void drive_backup_prepare(BlkTransactionState *common, Error **errp) { DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); DriveBackup *backup; Error *local_err = NULL; assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); backup = common->action->drive_backup; qmp_drive_backup(backup->device, backup->target, backup->has_format, backup->format, backup->sync, backup->has_mode, backup->mode, backup->has_speed, backup->speed, backup->has_on_source_error, backup->on_source_error, backup->has_on_target_error, backup->on_target_error, &local_err); if (local_err) { error_propagate(errp, local_err); state->bs = NULL; state->job = NULL; return; } state->bs = bdrv_find(backup->device); state->job = state->bs->job; } static void drive_backup_abort(BlkTransactionState *common) { DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); BlockDriverState *bs = state->bs; /* Only cancel if it's the job we started */ if (bs && bs->job && bs->job == state->job) { block_job_cancel_sync(bs->job); } } static void abort_prepare(BlkTransactionState *common, Error **errp) { error_setg(errp, "Transaction aborted using Abort action"); } static void abort_commit(BlkTransactionState *common) { g_assert_not_reached(); /* this action never succeeds */ } static const BdrvActionOps actions[] = { [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { .instance_size = sizeof(ExternalSnapshotState), .prepare = external_snapshot_prepare, .commit = external_snapshot_commit, .abort = external_snapshot_abort, }, [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { .instance_size = sizeof(DriveBackupState), .prepare = drive_backup_prepare, .abort = drive_backup_abort, }, [TRANSACTION_ACTION_KIND_ABORT] = { .instance_size = sizeof(BlkTransactionState), .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, }, }; /* * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail * then we do not pivot any of the devices in the group, and abandon the * snapshots */ void qmp_transaction(TransactionActionList *dev_list, Error **errp) { TransactionActionList *dev_entry = dev_list; BlkTransactionState *state, *next; Error *local_err = NULL; QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; QSIMPLEQ_INIT(&snap_bdrv_states); /* drain all i/o before any snapshots */ bdrv_drain_all(); /* We don't do anything in this loop that commits us to the snapshot */ while (NULL != dev_entry) { TransactionAction *dev_info = NULL; const BdrvActionOps *ops; dev_info = dev_entry->value; dev_entry = dev_entry->next; assert(dev_info->kind < ARRAY_SIZE(actions)); ops = &actions[dev_info->kind]; assert(ops->instance_size > 0); state = g_malloc0(ops->instance_size); state->ops = ops; state->action = dev_info; QSIMPLEQ_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; } } QSIMPLEQ_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; abandon each new bs, and keep using * the original bs for all images */ QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { if (state->ops->abort) { state->ops->abort(state); } } exit: QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { if (state->ops->clean) { state->ops->clean(state); } g_free(state); } } static void eject_device(BlockBackend *blk, int force, Error **errp) { BlockDriverState *bs = blk_bs(blk); if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { return; } if (!blk_dev_has_removable_media(blk)) { error_setg(errp, "Device '%s' is not removable", bdrv_get_device_name(bs)); return; } if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) { blk_dev_eject_request(blk, force); if (!force) { error_setg(errp, "Device '%s' is locked", bdrv_get_device_name(bs)); return; } } bdrv_close(bs); } void qmp_eject(const char *device, bool has_force, bool force, Error **errp) { BlockBackend *blk; blk = blk_by_name(device); if (!blk) { error_set(errp, QERR_DEVICE_NOT_FOUND, device); return; } eject_device(blk, force, errp); } void qmp_block_passwd(bool has_device, const char *device, bool has_node_name, const char *node_name, const char *password, Error **errp) { Error *local_err = NULL; BlockDriverState *bs; int err; 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; } err = bdrv_set_key(bs, password); if (err == -EINVAL) { error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); return; } else if (err < 0) { error_set(errp, QERR_INVALID_PASSWORD); return; } } static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, int bdrv_flags, BlockDriver *drv, const char *password, Error **errp) { Error *local_err = NULL; int ret; ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); if (ret < 0) { error_propagate(errp, local_err); return; } if (bdrv_key_required(bs)) { if (password) { if (bdrv_set_key(bs, password) < 0) { error_set(errp, QERR_INVALID_PASSWORD); } } else { error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), bdrv_get_encrypted_filename(bs)); } } else if (password) { error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); } } void qmp_change_blockdev(const char *device, const char *filename, const char *format, Error **errp) { BlockBackend *blk; BlockDriverState *bs; BlockDriver *drv = NULL; int bdrv_flags; Error *err = NULL; blk = blk_by_name(device); if (!blk) { error_set(errp, QERR_DEVICE_NOT_FOUND, device); return; } bs = blk_bs(blk); if (format) { drv = bdrv_find_whitelisted_format(format, bs->read_only); if (!drv) { error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); return; } } eject_device(blk, 0, &err); if (err) { error_propagate(errp, err); return; } bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); } /* throttling disk I/O limits */ void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, int64_t bps_wr, int64_t iops, int64_t iops_rd, int64_t iops_wr, bool has_bps_max, int64_t bps_max, bool has_bps_rd_max, int64_t bps_rd_max, bool has_bps_wr_max, int64_t bps_wr_max, bool has_iops_max, int64_t iops_max, bool has_iops_rd_max, int64_t iops_rd_max, bool has_iops_wr_max, int64_t iops_wr_max, bool has_iops_size, int64_t iops_size, Error **errp) { ThrottleConfig cfg; BlockDriverState *bs; AioContext *aio_context; bs = bdrv_find(device); if (!bs) { error_set(errp, QERR_DEVICE_NOT_FOUND, device); return; } memset(&cfg, 0, sizeof(cfg)); cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; if (has_bps_max) { cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; } if (has_bps_rd_max) { cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; } if (has_bps_wr_max) { cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; } if (has_iops_max) { cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; } if (has_iops_rd_max) { cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; } if (has_iops_wr_max) { cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; } if (has_iops_size) { cfg.op_size = iops_size; } if (!check_throttle_config(&cfg, errp)) { return; } aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { bdrv_io_limits_enable(bs); } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { bdrv_io_limits_disable(bs); } if (bs->io_limits_enabled) { bdrv_set_io_limits(bs, &cfg); } aio_context_release(aio_context); } int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) { const char *id = qdict_get_str(qdict, "id"); BlockBackend *blk; BlockDriverState *bs; AioContext *aio_context; Error *local_err = NULL; blk = blk_by_name(id); if (!blk) { error_report("Device '%s' not found", id); return -1; } bs = blk_bs(blk); if (!blk_legacy_dinfo(blk)) { error_report("Deleting device added with blockdev-add" " is not supported"); return -1; } aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { error_report("%s", error_get_pretty(local_err)); error_free(local_err); aio_context_release(aio_context); return -1; } /* quiesce block driver; prevent further io */ bdrv_drain_all(); bdrv_flush(bs); bdrv_close(bs); /* if we have a device attached to this BlockDriverState * then we need to make the drive anonymous until the device * can be removed. If this is a drive with no device backing * then we can just get rid of the block driver state right here. */ if (blk_get_attached_dev(blk)) { blk_hide_on_behalf_of_do_drive_del(blk); /* Further I/O must not pause the guest */ bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, BLOCKDEV_ON_ERROR_REPORT); } else { blk_unref(blk); } aio_context_release(aio_context); return 0; } void 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; BlockDriverState *bs; AioContext *aio_context; int ret; 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; } aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); if (!bdrv_is_first_non_filter(bs)) { error_set(errp, QERR_FEATURE_DISABLED, "resize"); goto out; } if (size < 0) { error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); goto out; } if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { error_set(errp, QERR_DEVICE_IN_USE, device); goto out; } /* complete all in-flight operations before resizing the device */ bdrv_drain_all(); ret = bdrv_truncate(bs, size); switch (ret) { case 0: break; case -ENOMEDIUM: error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); break; case -ENOTSUP: error_set(errp, QERR_UNSUPPORTED); break; case -EACCES: error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); break; case -EBUSY: error_set(errp, QERR_DEVICE_IN_USE, device); break; default: error_setg_errno(errp, -ret, "Could not resize"); break; } out: aio_context_release(aio_context); } static void block_job_cb(void *opaque, int ret) { /* Note that this function may be executed from another AioContext besides * the QEMU main loop. If you need to access anything that assumes the * QEMU global mutex, use a BH or introduce a mutex. */ BlockDriverState *bs = opaque; const char *msg = NULL; trace_block_job_cb(bs, bs->job, ret); assert(bs->job); if (ret < 0) { msg = strerror(-ret); } if (block_job_is_cancelled(bs->job)) { block_job_event_cancelled(bs->job); } else { block_job_event_completed(bs->job, msg); } bdrv_put_ref_bh_schedule(bs); } void qmp_block_stream(const char *device, bool has_base, const char *base, bool has_backing_file, const char *backing_file, bool has_speed, int64_t speed, bool has_on_error, BlockdevOnError on_error, Error **errp) { BlockDriverState *bs; BlockDriverState *base_bs = NULL; AioContext *aio_context; Error *local_err = NULL; const char *base_name = NULL; if (!has_on_error) { on_error = BLOCKDEV_ON_ERROR_REPORT; } bs = bdrv_find(device); if (!bs) { error_set(errp, QERR_DEVICE_NOT_FOUND, device); return; } aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { goto out; } if (has_base) { base_bs = bdrv_find_backing_image(bs, base); if (base_bs == NULL) { error_set(errp, QERR_BASE_NOT_FOUND, base); goto out; } assert(bdrv_get_aio_context(base_bs) == aio_context); base_name = base; } /* 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; } /* backing_file string overrides base bs filename */ base_name = has_backing_file ? backing_file : base_name; stream_start(bs, base_bs, base_name, has_speed ? speed : 0, on_error, block_job_cb, bs, &local_err); if (local_err) { error_propagate(errp, local_err); goto out; } trace_qmp_block_stream(bs, bs->job); out: aio_context_release(aio_context); } void qmp_block_commit(const char *device, bool has_base, const char *base, bool has_top, const char *top, bool has_backing_file, const char *backing_file, bool has_speed, int64_t speed, Error **errp) { BlockDriverState *bs; BlockDriverState *base_bs, *top_bs; AioContext *aio_context; Error *local_err = NULL; /* This will be part of the QMP command, if/when the * BlockdevOnError change for blkmirror makes it in */ BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; if (!has_speed) { speed = 0; } /* 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 = bdrv_find(device); if (!bs) { error_set(errp, QERR_DEVICE_NOT_FOUND, device); return; } aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); /* drain all i/o before commits */ bdrv_drain_all(); if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, errp)) { goto out; } /* default top_bs is the active layer */ top_bs = bs; if (has_top && top) { 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 && base) { base_bs = bdrv_find_backing_image(top_bs, base); } else { base_bs = bdrv_find_base(top_bs); } if (base_bs == NULL) { error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); goto out; } assert(bdrv_get_aio_context(base_bs) == aio_context); /* 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; } if (top_bs == bs) { if (has_backing_file) { error_setg(errp, "'backing-file' specified," " but 'top' is the active layer"); goto out; } commit_active_start(bs, base_bs, speed, on_error, block_job_cb, bs, &local_err); } else { commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, has_backing_file ? backing_file : NULL, &local_err); } if (local_err != NULL) { error_propagate(errp, local_err); goto out; } out: aio_context_release(aio_context); } void qmp_drive_backup(const char *device, const char *target, bool has_format, const char *format, enum MirrorSyncMode sync, bool has_mode, enum NewImageMode mode, bool has_speed, int64_t speed, bool has_on_source_error, BlockdevOnError on_source_error, bool has_on_target_error, BlockdevOnError on_target_error, Error **errp) { BlockDriverState *bs; BlockDriverState *target_bs; BlockDriverState *source = NULL; AioContext *aio_context; BlockDriver *drv = NULL; Error *local_err = NULL; int flags; int64_t size; int ret; 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_mode) { mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; } bs = bdrv_find(device); if (!bs) { error_set(errp, QERR_DEVICE_NOT_FOUND, device); return; } aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); if (!bdrv_is_inserted(bs)) { error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); goto out; } if (!has_format) { format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; } if (format) { drv = bdrv_find_format(format); if (!drv) { error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); goto out; } } 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 (sync == MIRROR_SYNC_MODE_TOP) { source = bs->backing_hd; if (!source) { sync = MIRROR_SYNC_MODE_FULL; } } if (sync == MIRROR_SYNC_MODE_NONE) { source = bs; } size = bdrv_getlength(bs); if (size < 0) { error_setg_errno(errp, -size, "bdrv_getlength failed"); goto out; } if (mode != NEW_IMAGE_MODE_EXISTING) { assert(format && drv); if (source) { bdrv_img_create(target, format, source->filename, source->drv->format_name, NULL, size, flags, &local_err, false); } else { bdrv_img_create(target, format, NULL, NULL, NULL, size, flags, &local_err, false); } } if (local_err) { error_propagate(errp, local_err); goto out; } target_bs = NULL; ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); if (ret < 0) { error_propagate(errp, local_err); goto out; } bdrv_set_aio_context(target_bs, aio_context); backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, block_job_cb, bs, &local_err); if (local_err != NULL) { bdrv_unref(target_bs); error_propagate(errp, local_err); goto out; } out: aio_context_release(aio_context); } BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) { return bdrv_named_nodes_list(); } #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) void qmp_drive_mirror(const char *device, const char *target, bool has_format, const char *format, bool has_node_name, const char *node_name, bool has_replaces, const char *replaces, enum MirrorSyncMode sync, bool has_mode, enum NewImageMode mode, 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, Error **errp) { BlockDriverState *bs; BlockDriverState *source, *target_bs; AioContext *aio_context; BlockDriver *drv = NULL; Error *local_err = NULL; QDict *options = NULL; int flags; int64_t size; int ret; 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_mode) { mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; } if (!has_granularity) { granularity = 0; } if (!has_buf_size) { buf_size = DEFAULT_MIRROR_BUF_SIZE; } if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "a value in range [512B, 64MB]"); return; } if (granularity & (granularity - 1)) { error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2"); return; } bs = bdrv_find(device); if (!bs) { error_set(errp, QERR_DEVICE_NOT_FOUND, device); return; } aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); if (!bdrv_is_inserted(bs)) { error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); goto out; } if (!has_format) { format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; } if (format) { drv = bdrv_find_format(format); if (!drv) { error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); goto out; } } if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { goto out; } flags = bs->open_flags | BDRV_O_RDWR; source = bs->backing_hd; if (!source && sync == MIRROR_SYNC_MODE_TOP) { sync = MIRROR_SYNC_MODE_FULL; } if (sync == MIRROR_SYNC_MODE_NONE) { source = bs; } size = bdrv_getlength(bs); if (size < 0) { error_setg_errno(errp, -size, "bdrv_getlength failed"); goto out; } if (has_replaces) { BlockDriverState *to_replace_bs; AioContext *replace_aio_context; int64_t replace_size; if (!has_node_name) { error_setg(errp, "a node-name must be provided when replacing a" " named node of the graph"); goto out; } to_replace_bs = check_to_replace_node(replaces, &local_err); if (!to_replace_bs) { error_propagate(errp, local_err); goto out; } 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 (size != replace_size) { error_setg(errp, "cannot replace image with a mirror image of " "different size"); goto out; } } if ((sync == MIRROR_SYNC_MODE_FULL || !source) && mode != NEW_IMAGE_MODE_EXISTING) { /* create new image w/o backing file */ assert(format && drv); bdrv_img_create(target, format, NULL, NULL, NULL, size, flags, &local_err, false); } else { switch (mode) { case NEW_IMAGE_MODE_EXISTING: break; case NEW_IMAGE_MODE_ABSOLUTE_PATHS: /* create new image with backing file */ bdrv_img_create(target, format, source->filename, source->drv->format_name, NULL, size, flags, &local_err, false); break; default: abort(); } } if (local_err) { error_propagate(errp, local_err); goto out; } if (has_node_name) { options = qdict_new(); qdict_put(options, "node-name", qstring_from_str(node_name)); } /* Mirroring takes care of copy-on-write using the source's backing * file. */ target_bs = NULL; ret = bdrv_open(&target_bs, target, NULL, options, flags | BDRV_O_NO_BACKING, drv, &local_err); if (ret < 0) { error_propagate(errp, local_err); goto out; } bdrv_set_aio_context(target_bs, aio_context); /* 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(bs, target_bs, has_replaces ? replaces : NULL, speed, granularity, buf_size, sync, on_source_error, on_target_error, block_job_cb, bs, &local_err); if (local_err != NULL) { bdrv_unref(target_bs); error_propagate(errp, local_err); goto out; } out: aio_context_release(aio_context); } /* Get the block job for a given device name and acquire its AioContext */ static BlockJob *find_block_job(const char *device, AioContext **aio_context) { BlockDriverState *bs; bs = bdrv_find(device); if (!bs) { goto notfound; } *aio_context = bdrv_get_aio_context(bs); aio_context_acquire(*aio_context); if (!bs->job) { aio_context_release(*aio_context); goto notfound; } return bs->job; notfound: *aio_context = NULL; return NULL; } 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); if (!job) { error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 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); if (!job) { error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); return; } if (!has_force) { force = false; } if (job->paused && !force) { error_setg(errp, "The block job for device '%s' is currently paused", device); goto out; } trace_qmp_block_job_cancel(job); block_job_cancel(job); 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); if (!job) { error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); return; } trace_qmp_block_job_pause(job); block_job_pause(job); 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); if (!job) { error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); return; } trace_qmp_block_job_resume(job); block_job_resume(job); 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); if (!job) { error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); return; } trace_qmp_block_job_complete(job); block_job_complete(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; BlockDriverState *image_bs = NULL; Error *local_err = NULL; bool ro; int open_flags; int ret; /* find the top layer BDS of the chain */ bs = bdrv_find(device); if (!bs) { error_set(errp, QERR_DEVICE_NOT_FOUND, device); return; } image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); if (local_err) { error_propagate(errp, local_err); return; } if (!image_bs) { error_setg(errp, "image file not found"); return; } if (bdrv_find_base(image_bs) == image_bs) { error_setg(errp, "not allowing backing file change on an image " "without a backing file"); return; } /* 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)) { return; } /* final sanity check */ if (!bdrv_chain_contains(bs, image_bs)) { error_setg(errp, "'%s' and image file are not in the same chain", device); return; } /* if not r/w, reopen to make r/w */ open_flags = image_bs->open_flags; ro = bdrv_is_read_only(image_bs); if (ro) { bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); if (local_err) { error_propagate(errp, local_err); return; } } ret = bdrv_change_backing_file(image_bs, backing_file, image_bs->drv ? image_bs->drv->format_name : ""); 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(image_bs, open_flags, &local_err); if (local_err) { error_propagate(errp, local_err); /* will preserve prior errp */ } } } void qmp_blockdev_add(BlockdevOptions *options, Error **errp) { QmpOutputVisitor *ov = qmp_output_visitor_new(); BlockBackend *blk; QObject *obj; QDict *qdict; Error *local_err = NULL; /* Require an ID in the top level */ if (!options->has_id) { error_setg(errp, "Block device needs an ID"); goto fail; } /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with * cache.direct=false instead of silently switching to aio=threads, except * when called from drive_new(). * * For now, simply forbidding the combination for all drivers will do. */ if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { bool direct = options->has_cache && options->cache->has_direct && options->cache->direct; if (!direct) { error_setg(errp, "aio=native requires cache.direct=true"); goto fail; } } visit_type_BlockdevOptions(qmp_output_get_visitor(ov), &options, NULL, &local_err); if (local_err) { error_propagate(errp, local_err); goto fail; } obj = qmp_output_get_qobject(ov); qdict = qobject_to_qdict(obj); qdict_flatten(qdict); blk = blockdev_init(NULL, qdict, &local_err); if (local_err) { error_propagate(errp, local_err); goto fail; } if (bdrv_key_required(blk_bs(blk))) { blk_unref(blk); error_setg(errp, "blockdev-add doesn't support encrypted devices"); goto fail; } fail: qmp_output_visitor_cleanup(ov); } BlockJobInfoList *qmp_query_block_jobs(Error **errp) { BlockJobInfoList *head = NULL, **p_next = &head; BlockDriverState *bs; for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) { AioContext *aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); if (bs->job) { BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); elem->value = block_job_query(bs->job); *p_next = elem; p_next = &elem->next; } aio_context_release(aio_context); } return head; } 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 = "discard", .type = QEMU_OPT_STRING, .help = "discard operation (ignore/off, unmap/on)", },{ .name = "cache.writeback", .type = QEMU_OPT_BOOL, .help = "enables writeback mode for any caches", },{ .name = "cache.direct", .type = QEMU_OPT_BOOL, .help = "enables use of O_DIRECT (bypass the host page cache)", },{ .name = "cache.no-flush", .type = QEMU_OPT_BOOL, .help = "ignore any flush requests for the device", },{ .name = "aio", .type = QEMU_OPT_STRING, .help = "host AIO implementation (threads, native)", },{ .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 = "read-only", .type = QEMU_OPT_BOOL, .help = "open drive file as read-only", },{ .name = "throttling.iops-total", .type = QEMU_OPT_NUMBER, .help = "limit total I/O operations per second", },{ .name = "throttling.iops-read", .type = QEMU_OPT_NUMBER, .help = "limit read operations per second", },{ .name = "throttling.iops-write", .type = QEMU_OPT_NUMBER, .help = "limit write operations per second", },{ .name = "throttling.bps-total", .type = QEMU_OPT_NUMBER, .help = "limit total bytes per second", },{ .name = "throttling.bps-read", .type = QEMU_OPT_NUMBER, .help = "limit read bytes per second", },{ .name = "throttling.bps-write", .type = QEMU_OPT_NUMBER, .help = "limit write bytes per second", },{ .name = "throttling.iops-total-max", .type = QEMU_OPT_NUMBER, .help = "I/O operations burst", },{ .name = "throttling.iops-read-max", .type = QEMU_OPT_NUMBER, .help = "I/O operations read burst", },{ .name = "throttling.iops-write-max", .type = QEMU_OPT_NUMBER, .help = "I/O operations write burst", },{ .name = "throttling.bps-total-max", .type = QEMU_OPT_NUMBER, .help = "total bytes burst", },{ .name = "throttling.bps-read-max", .type = QEMU_OPT_NUMBER, .help = "total bytes read burst", },{ .name = "throttling.bps-write-max", .type = QEMU_OPT_NUMBER, .help = "total bytes write burst", },{ .name = "throttling.iops-size", .type = QEMU_OPT_NUMBER, .help = "when limiting by iops max size of an I/O in bytes", },{ .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)", }, { /* 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 */ } }, };