blockdev.c 96.0 KB
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/*
 * 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.
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 *
 * 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.
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 */

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#include "sysemu/block-backend.h"
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#include "sysemu/blockdev.h"
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#include "hw/block/block.h"
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#include "block/blockjob.h"
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#include "block/throttle-groups.h"
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#include "monitor/monitor.h"
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#include "qemu/error-report.h"
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#include "qemu/option.h"
#include "qemu/config-file.h"
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#include "qapi/qmp/types.h"
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#include "qapi-visit.h"
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#include "qapi/qmp/qerror.h"
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#include "qapi/qmp-output-visitor.h"
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#include "qapi/util.h"
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#include "sysemu/sysemu.h"
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#include "block/block_int.h"
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#include "qmp-commands.h"
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#include "trace.h"
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#include "sysemu/arch_init.h"
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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",
};

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static int if_max_devs[IF_COUNT] = {
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    /*
     * 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,
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};

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/**
 * Boards may call this to offer board-by-board overrides
 * of the default, global values.
 */
void override_max_devs(BlockInterfaceType type, int max_devs)
{
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    BlockBackend *blk;
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    DriveInfo *dinfo;

    if (max_devs <= 0) {
        return;
    }

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    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
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        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;
}

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/*
 * 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.
 */
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void blockdev_mark_auto_del(BlockBackend *blk)
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{
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    DriveInfo *dinfo = blk_legacy_dinfo(blk);
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    BlockDriverState *bs = blk_bs(blk);
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    AioContext *aio_context;
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    if (!dinfo) {
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        return;
    }

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    if (bs) {
        aio_context = bdrv_get_aio_context(bs);
        aio_context_acquire(aio_context);
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        if (bs->job) {
            block_job_cancel(bs->job);
        }
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        aio_context_release(aio_context);
    }
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    dinfo->auto_del = 1;
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}

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void blockdev_auto_del(BlockBackend *blk)
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{
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    DriveInfo *dinfo = blk_legacy_dinfo(blk);
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    if (dinfo && dinfo->auto_del) {
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        blk_unref(blk);
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    }
}

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/**
 * 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;
}

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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;
}

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QemuOpts *drive_def(const char *optstr)
{
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    return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
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}

QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
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                    const char *optstr)
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{
    QemuOpts *opts;

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    opts = drive_def(optstr);
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    if (!opts) {
        return NULL;
    }
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    if (type != IF_DEFAULT) {
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        qemu_opt_set(opts, "if", if_name[type], &error_abort);
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    }
    if (index >= 0) {
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        qemu_opt_set_number(opts, "index", index, &error_abort);
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    }
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    if (file)
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        qemu_opt_set(opts, "file", file, &error_abort);
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    return opts;
}

DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
{
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    BlockBackend *blk;
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    DriveInfo *dinfo;

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    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) {
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            return dinfo;
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        }
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    }

    return NULL;
}

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bool drive_check_orphaned(void)
{
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    BlockBackend *blk;
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    DriveInfo *dinfo;
    bool rs = false;

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    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
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        /* If dinfo->bdrv->dev is NULL, it has no device attached. */
        /* Unless this is a default drive, this may be an oversight. */
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        if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
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            dinfo->type != IF_NONE) {
            fprintf(stderr, "Warning: Orphaned drive without device: "
                    "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
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                    blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
                    if_name[dinfo->type], dinfo->bus, dinfo->unit);
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            rs = true;
        }
    }

    return rs;
}

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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));
}

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int drive_get_max_bus(BlockInterfaceType type)
{
    int max_bus;
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    BlockBackend *blk;
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    DriveInfo *dinfo;

    max_bus = -1;
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    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
        dinfo = blk_legacy_dinfo(blk);
        if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
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            max_bus = dinfo->bus;
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        }
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    }
    return max_bus;
}

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/* 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]++);
}

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static void bdrv_format_print(void *opaque, const char *name)
{
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    error_printf(" %s", name);
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}

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typedef struct {
    QEMUBH *bh;
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    BlockDriverState *bs;
} BDRVPutRefBH;
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static void bdrv_put_ref_bh(void *opaque)
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{
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    BDRVPutRefBH *s = opaque;
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    bdrv_unref(s->bs);
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    qemu_bh_delete(s->bh);
    g_free(s);
}

/*
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 * Release a BDS reference in a BH
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 *
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 * 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.
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 */
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static void bdrv_put_ref_bh_schedule(BlockDriverState *bs)
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{
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    BDRVPutRefBH *s;
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    s = g_new(BDRVPutRefBH, 1);
    s->bh = qemu_bh_new(bdrv_put_ref_bh, s);
    s->bs = bs;
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    qemu_bh_schedule(s->bh);
}

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static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
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{
    if (!strcmp(buf, "ignore")) {
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        return BLOCKDEV_ON_ERROR_IGNORE;
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    } else if (!is_read && !strcmp(buf, "enospc")) {
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        return BLOCKDEV_ON_ERROR_ENOSPC;
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    } else if (!strcmp(buf, "stop")) {
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        return BLOCKDEV_ON_ERROR_STOP;
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    } else if (!strcmp(buf, "report")) {
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        return BLOCKDEV_ON_ERROR_REPORT;
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    } else {
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        error_setg(errp, "'%s' invalid %s error action",
                   buf, is_read ? "read" : "write");
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        return -1;
    }
}

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static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
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{
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    if (throttle_conflicting(cfg)) {
        error_setg(errp, "bps/iops/max total values and read/write values"
                         " cannot be used at the same time");
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        return false;
    }

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    if (!throttle_is_valid(cfg)) {
        error_setg(errp, "bps/iops/maxs values must be 0 or greater");
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        return false;
    }

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    if (throttle_max_is_missing_limit(cfg)) {
        error_setg(errp, "bps_max/iops_max require corresponding"
                         " bps/iops values");
        return false;
    }

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    return true;
}

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typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;

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/* Takes the ownership of bs_opts */
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static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
                                   Error **errp)
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{
    const char *buf;
    int ro = 0;
    int bdrv_flags = 0;
    int on_read_error, on_write_error;
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    BlockBackend *blk;
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    BlockDriverState *bs;
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    ThrottleConfig cfg;
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    int snapshot = 0;
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    bool copy_on_read;
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    Error *error = NULL;
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    QemuOpts *opts;
    const char *id;
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    bool has_driver_specific_opts;
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    BlockdevDetectZeroesOptions detect_zeroes;
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    const char *throttling_group;
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    /* 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");
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    opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
377
    if (error) {
378
        error_propagate(errp, error);
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        goto err_no_opts;
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    }

    qemu_opts_absorb_qdict(opts, bs_opts, &error);
383
    if (error) {
384
        error_propagate(errp, error);
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        goto early_err;
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    }

    if (id) {
        qdict_del(bs_opts, "id");
    }

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    has_driver_specific_opts = !!qdict_size(bs_opts);

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    /* extract parameters */
    snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
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    ro = qemu_opt_get_bool(opts, "read-only", 0);
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    copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
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    if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
        if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
401
            error_setg(errp, "invalid discard option");
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            goto early_err;
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        }
    }

406
    if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) {
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        bdrv_flags |= BDRV_O_CACHE_WB;
    }
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    if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) {
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        bdrv_flags |= BDRV_O_NOCACHE;
    }
412
    if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) {
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        bdrv_flags |= BDRV_O_NO_FLUSH;
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    }

    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 {
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           error_setg(errp, "invalid aio option");
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           goto early_err;
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        }
    }

    if ((buf = qemu_opt_get(opts, "format")) != NULL) {
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        if (is_help_option(buf)) {
            error_printf("Supported formats:");
            bdrv_iterate_format(bdrv_format_print, NULL);
            error_printf("\n");
432
            goto early_err;
433
        }
434

435 436
        if (qdict_haskey(bs_opts, "driver")) {
            error_setg(errp, "Cannot specify both 'driver' and 'format'");
437
            goto early_err;
438
        }
439
        qdict_put(bs_opts, "driver", qstring_from_str(buf));
440 441
    }

442
    /* disk I/O throttling */
443 444
    memset(&cfg, 0, sizeof(cfg));
    cfg.buckets[THROTTLE_BPS_TOTAL].avg =
445
        qemu_opt_get_number(opts, "throttling.bps-total", 0);
446
    cfg.buckets[THROTTLE_BPS_READ].avg  =
447
        qemu_opt_get_number(opts, "throttling.bps-read", 0);
448
    cfg.buckets[THROTTLE_BPS_WRITE].avg =
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        qemu_opt_get_number(opts, "throttling.bps-write", 0);
450
    cfg.buckets[THROTTLE_OPS_TOTAL].avg =
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        qemu_opt_get_number(opts, "throttling.iops-total", 0);
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    cfg.buckets[THROTTLE_OPS_READ].avg =
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        qemu_opt_get_number(opts, "throttling.iops-read", 0);
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    cfg.buckets[THROTTLE_OPS_WRITE].avg =
455
        qemu_opt_get_number(opts, "throttling.iops-write", 0);
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    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);
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470
    cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
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    throttling_group = qemu_opt_get(opts, "throttling.group");

474
    if (!check_throttle_config(&cfg, &error)) {
475
        error_propagate(errp, error);
476
        goto early_err;
477 478
    }

479
    on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
480
    if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
481
        on_write_error = parse_block_error_action(buf, 0, &error);
482
        if (error) {
483
            error_propagate(errp, error);
484
            goto early_err;
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        }
    }

488
    on_read_error = BLOCKDEV_ON_ERROR_REPORT;
489
    if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
490
        on_read_error = parse_block_error_action(buf, 1, &error);
491
        if (error) {
492
            error_propagate(errp, error);
493
            goto early_err;
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        }
    }

497
    detect_zeroes =
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        qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
                        qemu_opt_get(opts, "detect-zeroes"),
                        BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
                        BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
                        &error);
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    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;
    }

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    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;
    }

    bdrv_flags |= ro ? 0 : BDRV_O_RDWR;

527
    /* init */
528
    if ((!file || !*file) && !has_driver_specific_opts) {
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        BlockBackendRootState *blk_rs;

        blk = blk_new(qemu_opts_id(opts), errp);
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        if (!blk) {
            goto early_err;
        }
535

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        blk_rs = blk_get_root_state(blk);
        blk_rs->open_flags    = bdrv_flags;
        blk_rs->read_only     = ro;
        blk_rs->detect_zeroes = detect_zeroes;

        if (throttle_enabled(&cfg)) {
            if (!throttling_group) {
                throttling_group = blk_name(blk);
            }
            blk_rs->throttle_group = g_strdup(throttling_group);
            blk_rs->throttle_state = throttle_group_incref(throttling_group);
            blk_rs->throttle_state->cfg = cfg;
        }
549

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        QDECREF(bs_opts);
    } else {
        if (file && !*file) {
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            file = NULL;
        }
555

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        blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
                           errp);
        if (!blk) {
            goto err_no_bs_opts;
        }
        bs = blk_bs(blk);
562

563
        bs->detect_zeroes = detect_zeroes;
564

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        /* disk I/O throttling */
        if (throttle_enabled(&cfg)) {
            if (!throttling_group) {
                throttling_group = blk_name(blk);
            }
            bdrv_io_limits_enable(bs, throttling_group);
            bdrv_set_io_limits(bs, &cfg);
        }
573

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        if (bdrv_key_required(bs)) {
            autostart = 0;
576
        }
577 578
    }

579
    blk_set_on_error(blk, on_read_error, on_write_error);
580

581
err_no_bs_opts:
582
    qemu_opts_del(opts);
583
    return blk;
584

585 586
early_err:
    qemu_opts_del(opts);
587 588
err_no_opts:
    QDECREF(bs_opts);
589
    return NULL;
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}

592 593
static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
                            Error **errp)
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{
    const char *value;

    value = qemu_opt_get(opts, from);
    if (value) {
599 600 601 602 603
        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;
        }
604 605 606 607
    }

    /* rename all items in opts */
    while ((value = qemu_opt_get(opts, from))) {
608
        qemu_opt_set(opts, to, value, &error_abort);
609 610 611 612
        qemu_opt_unset(opts, from);
    }
}

613 614 615 616 617
QemuOptsList qemu_legacy_drive_opts = {
    .name = "drive",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
    .desc = {
        {
618 619 620 621 622 623 624 625 626 627 628 629
            .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",
        },{
630 631 632
            .name = "media",
            .type = QEMU_OPT_STRING,
            .help = "media type (disk, cdrom)",
633 634 635 636
        },{
            .name = "if",
            .type = QEMU_OPT_STRING,
            .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652
        },{
            .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)",
653 654 655 656
        },{
            .name = "boot",
            .type = QEMU_OPT_BOOL,
            .help = "(deprecated, ignored)",
657 658 659 660
        },{
            .name = "addr",
            .type = QEMU_OPT_STRING,
            .help = "pci address (virtio only)",
661 662 663 664
        },{
            .name = "serial",
            .type = QEMU_OPT_STRING,
            .help = "disk serial number",
M
Max Reitz 已提交
665 666 667 668
        },{
            .name = "file",
            .type = QEMU_OPT_STRING,
            .help = "file name",
669
        },
670 671 672 673 674 675

        /* 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",
676 677 678 679 680 681 682 683
        },{
            .name = "rerror",
            .type = QEMU_OPT_STRING,
            .help = "read error action",
        },{
            .name = "werror",
            .type = QEMU_OPT_STRING,
            .help = "write error action",
684 685 686 687 688 689
        },{
            .name = "copy-on-read",
            .type = QEMU_OPT_BOOL,
            .help = "copy read data from backing file into image file",
        },

690 691 692 693
        { /* end of list */ }
    },
};

694
DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
695
{
K
Kevin Wolf 已提交
696
    const char *value;
697
    BlockBackend *blk;
698
    DriveInfo *dinfo = NULL;
699
    QDict *bs_opts;
700 701
    QemuOpts *legacy_opts;
    DriveMediaType media = MEDIA_DISK;
702
    BlockInterfaceType type;
703
    int cyls, heads, secs, translation;
704
    int max_devs, bus_id, unit_id, index;
705
    const char *devaddr;
706
    const char *werror, *rerror;
F
Fam Zheng 已提交
707 708
    bool read_only = false;
    bool copy_on_read;
709
    const char *serial;
M
Max Reitz 已提交
710
    const char *filename;
711
    Error *local_err = NULL;
712
    int i;
K
Kevin Wolf 已提交
713

714
    /* Change legacy command line options into QMP ones */
715 716 717 718 719 720 721
    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" },
722

723 724 725
        { "bps",            "throttling.bps-total" },
        { "bps_rd",         "throttling.bps-read" },
        { "bps_wr",         "throttling.bps-write" },
726

727 728 729
        { "iops_max",       "throttling.iops-total-max" },
        { "iops_rd_max",    "throttling.iops-read-max" },
        { "iops_wr_max",    "throttling.iops-write-max" },
730

731 732 733
        { "bps_max",        "throttling.bps-total-max" },
        { "bps_rd_max",     "throttling.bps-read-max" },
        { "bps_wr_max",     "throttling.bps-write-max" },
734

735
        { "iops_size",      "throttling.iops-size" },
736

737 738
        { "group",          "throttling.group" },

739 740 741 742
        { "readonly",       "read-only" },
    };

    for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
743 744 745
        qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
                        &local_err);
        if (local_err) {
746
            error_report_err(local_err);
747 748
            return NULL;
        }
749
    }
750

K
Kevin Wolf 已提交
751 752 753 754 755 756 757 758 759 760
    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 */
761 762
        if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
            qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
763
                              !!(flags & BDRV_O_CACHE_WB), &error_abort);
K
Kevin Wolf 已提交
764
        }
765 766
        if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
            qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
767
                              !!(flags & BDRV_O_NOCACHE), &error_abort);
K
Kevin Wolf 已提交
768
        }
769 770
        if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
            qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
771
                              !!(flags & BDRV_O_NO_FLUSH), &error_abort);
K
Kevin Wolf 已提交
772 773 774 775
        }
        qemu_opt_unset(all_opts, "cache");
    }

776 777 778 779
    /* Get a QDict for processing the options */
    bs_opts = qdict_new();
    qemu_opts_to_qdict(all_opts, bs_opts);

780 781
    legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
                                   &error_abort);
782
    qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
783
    if (local_err) {
784
        error_report_err(local_err);
785 786 787
        goto fail;
    }

788 789 790 791 792 793 794
    /* 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");
    }

795 796 797 798 799 800 801
    /* 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;
F
Fam Zheng 已提交
802
            read_only = true;
803 804 805 806 807 808
        } else {
            error_report("'%s' invalid media", value);
            goto fail;
        }
    }

809
    /* copy-on-read is disabled with a warning for read-only devices */
F
Fam Zheng 已提交
810
    read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
811 812 813 814 815 816 817 818 819 820 821 822
    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"));

823 824 825 826 827 828 829 830 831 832 833 834 835 836 837
    /* 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;
    }

838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869
    /* 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;
870 871 872 873
        } else if (!strcmp(value, "large")) {
            translation = BIOS_ATA_TRANSLATION_LARGE;
        } else if (!strcmp(value, "rechs")) {
            translation = BIOS_ATA_TRANSLATION_RECHS;
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888
        } 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;
        }
    }

889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927
    /* 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;
    }

928 929 930
    /* Serial number */
    serial = qemu_opt_get(legacy_opts, "serial");

931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948
    /* 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);
    }

949 950 951 952 953 954 955 956 957
    /* 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;
958 959
        devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
                                   &error_abort);
960
        if (arch_type == QEMU_ARCH_S390X) {
961
            qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
962
        } else {
963
            qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
964
        }
965 966
        qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
                     &error_abort);
967
        if (devaddr) {
968
            qemu_opt_set(devopts, "addr", devaddr, &error_abort);
969 970 971
        }
    }

M
Max Reitz 已提交
972 973
    filename = qemu_opt_get(legacy_opts, "file");

974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994
    /* 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));
    }

995
    /* Actual block device init: Functionality shared with blockdev-add */
996
    blk = blockdev_init(filename, bs_opts, &local_err);
997
    bs_opts = NULL;
998
    if (!blk) {
999
        if (local_err) {
1000
            error_report_err(local_err);
1001
        }
1002
        goto fail;
1003
    } else {
1004
        assert(!local_err);
1005 1006
    }

1007 1008
    /* Create legacy DriveInfo */
    dinfo = g_malloc0(sizeof(*dinfo));
1009
    dinfo->opts = all_opts;
1010

1011 1012 1013 1014 1015
    dinfo->cyls = cyls;
    dinfo->heads = heads;
    dinfo->secs = secs;
    dinfo->trans = translation;

1016
    dinfo->type = type;
1017 1018
    dinfo->bus = bus_id;
    dinfo->unit = unit_id;
1019
    dinfo->devaddr = devaddr;
1020 1021
    dinfo->serial = g_strdup(serial);

1022 1023
    blk_set_legacy_dinfo(blk, dinfo);

1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
    switch(type) {
    case IF_IDE:
    case IF_SCSI:
    case IF_XEN:
    case IF_NONE:
        dinfo->media_cd = media == MEDIA_CDROM;
        break;
    default:
        break;
    }

1035
fail:
1036
    qemu_opts_del(legacy_opts);
1037
    QDECREF(bs_opts);
1038
    return dinfo;
1039 1040
}

1041
void hmp_commit(Monitor *mon, const QDict *qdict)
1042 1043
{
    const char *device = qdict_get_str(qdict, "device");
1044
    BlockBackend *blk;
1045
    int ret;
1046

1047
    if (!strcmp(device, "all")) {
1048
        ret = bdrv_commit_all();
1049
    } else {
1050 1051
        blk = blk_by_name(device);
        if (!blk) {
1052
            monitor_printf(mon, "Device '%s' not found\n", device);
1053
            return;
1054
        }
M
Max Reitz 已提交
1055 1056 1057 1058
        if (!blk_is_available(blk)) {
            monitor_printf(mon, "Device '%s' has no medium\n", device);
            return;
        }
1059
        ret = bdrv_commit(blk_bs(blk));
1060 1061 1062 1063
    }
    if (ret < 0) {
        monitor_printf(mon, "'commit' error for '%s': %s\n", device,
                       strerror(-ret));
1064 1065 1066
    }
}

1067 1068
static void blockdev_do_action(int kind, void *data, Error **errp)
{
1069 1070
    TransactionAction action;
    TransactionActionList list;
1071 1072 1073 1074 1075 1076 1077 1078

    action.kind = kind;
    action.data = data;
    list.value = &action;
    list.next = NULL;
    qmp_transaction(&list, errp);
}

1079 1080 1081 1082 1083
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,
1084
                                bool has_format, const char *format,
1085
                                bool has_mode, NewImageMode mode, Error **errp)
1086
{
1087
    BlockdevSnapshot snapshot = {
1088
        .has_device = has_device,
1089
        .device = (char *) device,
1090 1091
        .has_node_name = has_node_name,
        .node_name = (char *) node_name,
1092
        .snapshot_file = (char *) snapshot_file,
1093 1094
        .has_snapshot_node_name = has_snapshot_node_name,
        .snapshot_node_name = (char *) snapshot_node_name,
1095 1096 1097 1098 1099
        .has_format = has_format,
        .format = (char *) format,
        .has_mode = has_mode,
        .mode = mode,
    };
1100 1101
    blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
                       &snapshot, errp);
1102 1103
}

1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116
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);
}

1117 1118 1119 1120 1121 1122 1123
SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
                                                         bool has_id,
                                                         const char *id,
                                                         bool has_name,
                                                         const char *name,
                                                         Error **errp)
{
1124 1125
    BlockDriverState *bs;
    BlockBackend *blk;
1126
    AioContext *aio_context;
1127 1128 1129 1130 1131
    QEMUSnapshotInfo sn;
    Error *local_err = NULL;
    SnapshotInfo *info = NULL;
    int ret;

1132 1133
    blk = blk_by_name(device);
    if (!blk) {
1134 1135
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
1136 1137
        return NULL;
    }
M
Max Reitz 已提交
1138 1139 1140

    aio_context = blk_get_aio_context(blk);
    aio_context_acquire(aio_context);
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151

    if (!has_id) {
        id = NULL;
    }

    if (!has_name) {
        name = NULL;
    }

    if (!id && !name) {
        error_setg(errp, "Name or id must be provided");
M
Max Reitz 已提交
1152
        goto out_aio_context;
1153 1154
    }

M
Max Reitz 已提交
1155 1156 1157 1158 1159
    if (!blk_is_available(blk)) {
        error_setg(errp, "Device '%s' has no medium", device);
        goto out_aio_context;
    }
    bs = blk_bs(blk);
1160

1161 1162 1163 1164
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
        goto out_aio_context;
    }

1165
    ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1166
    if (local_err) {
1167
        error_propagate(errp, local_err);
1168
        goto out_aio_context;
1169 1170 1171 1172 1173 1174
    }
    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);
1175
        goto out_aio_context;
1176 1177 1178
    }

    bdrv_snapshot_delete(bs, id, name, &local_err);
1179
    if (local_err) {
1180
        error_propagate(errp, local_err);
1181
        goto out_aio_context;
1182 1183
    }

1184 1185
    aio_context_release(aio_context);

1186
    info = g_new0(SnapshotInfo, 1);
1187 1188 1189 1190 1191 1192 1193 1194 1195
    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;
1196 1197 1198 1199

out_aio_context:
    aio_context_release(aio_context);
    return NULL;
1200
}
1201

1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263
/**
 * block_dirty_bitmap_lookup:
 * Return a dirty bitmap (if present), after validating
 * the node reference and bitmap names.
 *
 * @node: The name of the BDS node to search for bitmaps
 * @name: The name of the bitmap to search for
 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL.
 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL.
 * @errp: Output pointer for error information. Can be NULL.
 *
 * @return: A bitmap object on success, or NULL on failure.
 */
static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
                                                  const char *name,
                                                  BlockDriverState **pbs,
                                                  AioContext **paio,
                                                  Error **errp)
{
    BlockDriverState *bs;
    BdrvDirtyBitmap *bitmap;
    AioContext *aio_context;

    if (!node) {
        error_setg(errp, "Node cannot be NULL");
        return NULL;
    }
    if (!name) {
        error_setg(errp, "Bitmap name cannot be NULL");
        return NULL;
    }
    bs = bdrv_lookup_bs(node, node, NULL);
    if (!bs) {
        error_setg(errp, "Node '%s' not found", node);
        return NULL;
    }

    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

    bitmap = bdrv_find_dirty_bitmap(bs, name);
    if (!bitmap) {
        error_setg(errp, "Dirty bitmap '%s' not found", name);
        goto fail;
    }

    if (pbs) {
        *pbs = bs;
    }
    if (paio) {
        *paio = aio_context;
    } else {
        aio_context_release(aio_context);
    }

    return bitmap;

 fail:
    aio_context_release(aio_context);
    return NULL;
}

1264
/* New and old BlockDriverState structs for atomic group operations */
1265

1266
typedef struct BlkTransactionState BlkTransactionState;
1267 1268 1269 1270 1271 1272 1273

/* 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. */
1274
    void (*prepare)(BlkTransactionState *common, Error **errp);
1275
    /* Commit the changes, can be NULL. */
1276
    void (*commit)(BlkTransactionState *common);
1277
    /* Abort the changes on fail, can be NULL. */
1278
    void (*abort)(BlkTransactionState *common);
1279
    /* Clean up resource in the end, can be NULL. */
1280
    void (*clean)(BlkTransactionState *common);
1281 1282 1283 1284 1285 1286 1287
} 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().
 */
1288
struct BlkTransactionState {
1289
    TransactionAction *action;
1290
    const BdrvActionOps *ops;
1291
    QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1292 1293
};

1294 1295 1296 1297
/* internal snapshot private data */
typedef struct InternalSnapshotState {
    BlkTransactionState common;
    BlockDriverState *bs;
1298
    AioContext *aio_context;
1299 1300 1301 1302 1303 1304
    QEMUSnapshotInfo sn;
} InternalSnapshotState;

static void internal_snapshot_prepare(BlkTransactionState *common,
                                      Error **errp)
{
1305
    Error *local_err = NULL;
1306 1307
    const char *device;
    const char *name;
1308
    BlockBackend *blk;
1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326
    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 */
1327 1328
    blk = blk_by_name(device);
    if (!blk) {
1329 1330
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
1331 1332 1333
        return;
    }

1334
    /* AioContext is released in .clean() */
M
Max Reitz 已提交
1335
    state->aio_context = blk_get_aio_context(blk);
1336 1337
    aio_context_acquire(state->aio_context);

M
Max Reitz 已提交
1338
    if (!blk_is_available(blk)) {
1339
        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1340 1341
        return;
    }
M
Max Reitz 已提交
1342
    bs = blk_bs(blk);
1343

1344 1345 1346 1347
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
        return;
    }

1348
    if (bdrv_is_read_only(bs)) {
1349
        error_setg(errp, "Device '%s' is read only", device);
1350 1351 1352 1353
        return;
    }

    if (!bdrv_can_snapshot(bs)) {
1354 1355 1356
        error_setg(errp, "Block format '%s' used by device '%s' "
                   "does not support internal snapshots",
                   bs->drv->format_name, device);
1357 1358 1359 1360 1361 1362 1363 1364 1365
        return;
    }

    if (!strlen(name)) {
        error_setg(errp, "Name is empty");
        return;
    }

    /* check whether a snapshot with name exist */
1366 1367 1368 1369
    ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
                                            &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420
        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);
    }
}

1421 1422 1423 1424 1425 1426 1427 1428 1429 1430
static void internal_snapshot_clean(BlkTransactionState *common)
{
    InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
                                             common, common);

    if (state->aio_context) {
        aio_context_release(state->aio_context);
    }
}

1431
/* external snapshot private data */
1432 1433
typedef struct ExternalSnapshotState {
    BlkTransactionState common;
1434 1435
    BlockDriverState *old_bs;
    BlockDriverState *new_bs;
1436
    AioContext *aio_context;
1437
} ExternalSnapshotState;
1438

1439
static void external_snapshot_prepare(BlkTransactionState *common,
1440 1441 1442
                                      Error **errp)
{
    int flags, ret;
1443
    QDict *options;
1444
    Error *local_err = NULL;
1445
    bool has_device = false;
1446
    const char *device;
1447 1448 1449 1450
    bool has_node_name = false;
    const char *node_name;
    bool has_snapshot_node_name = false;
    const char *snapshot_node_name;
1451 1452 1453
    const char *new_image_file;
    const char *format = "qcow2";
    enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1454 1455
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
1456
    TransactionAction *action = common->action;
1457

1458
    /* get parameters */
1459
    g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1460

1461
    has_device = action->blockdev_snapshot_sync->has_device;
1462
    device = action->blockdev_snapshot_sync->device;
1463 1464 1465 1466 1467 1468
    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;

1469 1470 1471 1472 1473 1474 1475 1476 1477
    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 */
1478 1479 1480
    state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
                                   has_node_name ? node_name : NULL,
                                   &local_err);
1481
    if (local_err) {
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
        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");
1493 1494 1495
        return;
    }

1496 1497 1498 1499
    /* Acquire AioContext now so any threads operating on old_bs stop */
    state->aio_context = bdrv_get_aio_context(state->old_bs);
    aio_context_acquire(state->aio_context);

1500
    if (!bdrv_is_inserted(state->old_bs)) {
1501
        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1502 1503 1504
        return;
    }

1505 1506
    if (bdrv_op_is_blocked(state->old_bs,
                           BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1507 1508 1509
        return;
    }

1510 1511
    if (!bdrv_is_read_only(state->old_bs)) {
        if (bdrv_flush(state->old_bs)) {
1512
            error_setg(errp, QERR_IO_ERROR);
1513 1514 1515 1516
            return;
        }
    }

1517
    if (!bdrv_is_first_non_filter(state->old_bs)) {
1518
        error_setg(errp, QERR_FEATURE_DISABLED, "snapshot");
1519 1520 1521
        return;
    }

1522
    flags = state->old_bs->open_flags;
1523 1524 1525 1526

    /* create new image w/backing file */
    if (mode != NEW_IMAGE_MODE_EXISTING) {
        bdrv_img_create(new_image_file, format,
1527 1528
                        state->old_bs->filename,
                        state->old_bs->drv->format_name,
1529
                        NULL, -1, flags, &local_err, false);
1530
        if (local_err) {
1531 1532 1533 1534 1535
            error_propagate(errp, local_err);
            return;
        }
    }

1536
    options = qdict_new();
1537 1538 1539 1540
    if (has_snapshot_node_name) {
        qdict_put(options, "node-name",
                  qstring_from_str(snapshot_node_name));
    }
1541
    qdict_put(options, "driver", qstring_from_str(format));
1542

1543 1544
    /* TODO Inherit bs->options or only take explicit options with an
     * extended QMP command? */
1545
    assert(state->new_bs == NULL);
1546
    ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1547
                    flags | BDRV_O_NO_BACKING, &local_err);
1548
    /* We will manually add the backing_hd field to the bs later */
1549
    if (ret != 0) {
1550
        error_propagate(errp, local_err);
1551 1552 1553
    }
}

1554
static void external_snapshot_commit(BlkTransactionState *common)
1555
{
1556 1557
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
1558

1559 1560
    bdrv_set_aio_context(state->new_bs, state->aio_context);

1561 1562
    /* This removes our old bs and adds the new bs */
    bdrv_append(state->new_bs, state->old_bs);
1563 1564 1565
    /* 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 */
1566
    bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
1567
                NULL);
1568 1569

    aio_context_release(state->aio_context);
1570 1571
}

1572
static void external_snapshot_abort(BlkTransactionState *common)
1573
{
1574 1575 1576
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
    if (state->new_bs) {
F
Fam Zheng 已提交
1577
        bdrv_unref(state->new_bs);
1578
    }
1579 1580 1581
    if (state->aio_context) {
        aio_context_release(state->aio_context);
    }
1582 1583
}

1584 1585 1586
typedef struct DriveBackupState {
    BlkTransactionState common;
    BlockDriverState *bs;
1587
    AioContext *aio_context;
1588 1589 1590 1591 1592 1593
    BlockJob *job;
} DriveBackupState;

static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1594
    BlockBackend *blk;
1595 1596 1597 1598 1599 1600
    DriveBackup *backup;
    Error *local_err = NULL;

    assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
    backup = common->action->drive_backup;

1601 1602
    blk = blk_by_name(backup->device);
    if (!blk) {
1603 1604
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", backup->device);
1605 1606 1607 1608
        return;
    }

    /* AioContext is released in .clean() */
M
Max Reitz 已提交
1609
    state->aio_context = blk_get_aio_context(blk);
1610 1611
    aio_context_acquire(state->aio_context);

1612 1613
    qmp_drive_backup(backup->device, backup->target,
                     backup->has_format, backup->format,
1614
                     backup->sync,
1615 1616
                     backup->has_mode, backup->mode,
                     backup->has_speed, backup->speed,
1617
                     backup->has_bitmap, backup->bitmap,
1618 1619 1620
                     backup->has_on_source_error, backup->on_source_error,
                     backup->has_on_target_error, backup->on_target_error,
                     &local_err);
1621
    if (local_err) {
1622 1623 1624 1625
        error_propagate(errp, local_err);
        return;
    }

M
Max Reitz 已提交
1626
    state->bs = blk_bs(blk);
1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640
    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);
    }
}

1641 1642 1643 1644 1645 1646 1647 1648 1649
static void drive_backup_clean(BlkTransactionState *common)
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);

    if (state->aio_context) {
        aio_context_release(state->aio_context);
    }
}

1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660
typedef struct BlockdevBackupState {
    BlkTransactionState common;
    BlockDriverState *bs;
    BlockJob *job;
    AioContext *aio_context;
} BlockdevBackupState;

static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp)
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
    BlockdevBackup *backup;
M
Max Reitz 已提交
1661
    BlockBackend *blk, *target;
1662 1663 1664 1665 1666
    Error *local_err = NULL;

    assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
    backup = common->action->blockdev_backup;

1667 1668
    blk = blk_by_name(backup->device);
    if (!blk) {
1669
        error_setg(errp, "Device '%s' not found", backup->device);
1670 1671 1672
        return;
    }

M
Max Reitz 已提交
1673 1674
    target = blk_by_name(backup->target);
    if (!target) {
1675
        error_setg(errp, "Device '%s' not found", backup->target);
1676 1677 1678 1679
        return;
    }

    /* AioContext is released in .clean() */
M
Max Reitz 已提交
1680 1681
    state->aio_context = blk_get_aio_context(blk);
    if (state->aio_context != blk_get_aio_context(target)) {
1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698
        state->aio_context = NULL;
        error_setg(errp, "Backup between two IO threads is not implemented");
        return;
    }
    aio_context_acquire(state->aio_context);

    qmp_blockdev_backup(backup->device, backup->target,
                        backup->sync,
                        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);
        return;
    }

M
Max Reitz 已提交
1699
    state->bs = blk_bs(blk);
1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722
    state->job = state->bs->job;
}

static void blockdev_backup_abort(BlkTransactionState *common)
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, 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 blockdev_backup_clean(BlkTransactionState *common)
{
    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);

    if (state->aio_context) {
        aio_context_release(state->aio_context);
    }
}

1723 1724 1725 1726 1727 1728 1729
static void abort_prepare(BlkTransactionState *common, Error **errp)
{
    error_setg(errp, "Transaction aborted using Abort action");
}

static void abort_commit(BlkTransactionState *common)
{
1730
    g_assert_not_reached(); /* this action never succeeds */
1731 1732
}

1733
static const BdrvActionOps actions[] = {
1734
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1735
        .instance_size = sizeof(ExternalSnapshotState),
1736 1737 1738 1739
        .prepare  = external_snapshot_prepare,
        .commit   = external_snapshot_commit,
        .abort = external_snapshot_abort,
    },
1740 1741 1742 1743
    [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
        .instance_size = sizeof(DriveBackupState),
        .prepare = drive_backup_prepare,
        .abort = drive_backup_abort,
1744
        .clean = drive_backup_clean,
1745
    },
1746 1747 1748 1749 1750 1751
    [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
        .instance_size = sizeof(BlockdevBackupState),
        .prepare = blockdev_backup_prepare,
        .abort = blockdev_backup_abort,
        .clean = blockdev_backup_clean,
    },
1752 1753 1754 1755 1756
    [TRANSACTION_ACTION_KIND_ABORT] = {
        .instance_size = sizeof(BlkTransactionState),
        .prepare = abort_prepare,
        .commit = abort_commit,
    },
1757 1758 1759 1760
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
        .instance_size = sizeof(InternalSnapshotState),
        .prepare  = internal_snapshot_prepare,
        .abort = internal_snapshot_abort,
1761
        .clean = internal_snapshot_clean,
1762
    },
1763 1764
};

1765
/*
1766 1767
 * 'Atomic' group operations.  The operations are performed as a set, and if
 * any fail then we roll back all operations in the group.
1768
 */
1769
void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1770
{
1771
    TransactionActionList *dev_entry = dev_list;
1772
    BlkTransactionState *state, *next;
1773
    Error *local_err = NULL;
1774

1775
    QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1776 1777
    QSIMPLEQ_INIT(&snap_bdrv_states);

1778
    /* drain all i/o before any operations */
1779 1780
    bdrv_drain_all();

1781
    /* We don't do anything in this loop that commits us to the operations */
1782
    while (NULL != dev_entry) {
1783
        TransactionAction *dev_info = NULL;
1784
        const BdrvActionOps *ops;
1785

1786 1787 1788
        dev_info = dev_entry->value;
        dev_entry = dev_entry->next;

1789 1790 1791
        assert(dev_info->kind < ARRAY_SIZE(actions));

        ops = &actions[dev_info->kind];
1792 1793
        assert(ops->instance_size > 0);

1794 1795 1796 1797
        state = g_malloc0(ops->instance_size);
        state->ops = ops;
        state->action = dev_info;
        QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1798

1799
        state->ops->prepare(state, &local_err);
1800
        if (local_err) {
1801 1802
            error_propagate(errp, local_err);
            goto delete_and_fail;
1803 1804 1805
        }
    }

1806
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1807 1808 1809
        if (state->ops->commit) {
            state->ops->commit(state);
        }
1810 1811 1812 1813 1814 1815
    }

    /* success */
    goto exit;

delete_and_fail:
1816
    /* failure, and it is all-or-none; roll back all operations */
1817 1818 1819
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
        if (state->ops->abort) {
            state->ops->abort(state);
1820
        }
1821 1822
    }
exit:
1823 1824 1825
    QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
        if (state->ops->clean) {
            state->ops->clean(state);
1826
        }
1827
        g_free(state);
1828 1829 1830 1831
    }
}


1832
static void eject_device(BlockBackend *blk, int force, Error **errp)
1833
{
1834
    BlockDriverState *bs = blk_bs(blk);
1835 1836
    AioContext *aio_context;

M
Max Reitz 已提交
1837 1838 1839 1840 1841
    if (!bs) {
        /* No medium inserted, so there is nothing to do */
        return;
    }

1842 1843
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);
1844

1845
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1846
        goto out;
1847
    }
1848
    if (!blk_dev_has_removable_media(blk)) {
1849 1850
        error_setg(errp, "Device '%s' is not removable",
                   bdrv_get_device_name(bs));
1851
        goto out;
1852
    }
1853

1854 1855
    if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) {
        blk_dev_eject_request(blk, force);
P
Paolo Bonzini 已提交
1856
        if (!force) {
1857 1858
            error_setg(errp, "Device '%s' is locked",
                       bdrv_get_device_name(bs));
1859
            goto out;
P
Paolo Bonzini 已提交
1860
        }
1861
    }
1862

1863
    bdrv_close(bs);
1864 1865 1866

out:
    aio_context_release(aio_context);
1867 1868
}

L
Luiz Capitulino 已提交
1869
void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1870
{
1871
    BlockBackend *blk;
1872

1873 1874
    blk = blk_by_name(device);
    if (!blk) {
1875 1876
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
L
Luiz Capitulino 已提交
1877
        return;
1878 1879
    }

1880
    eject_device(blk, force, errp);
1881 1882
}

1883 1884 1885
void qmp_block_passwd(bool has_device, const char *device,
                      bool has_node_name, const char *node_name,
                      const char *password, Error **errp)
1886
{
1887
    Error *local_err = NULL;
1888
    BlockDriverState *bs;
1889
    AioContext *aio_context;
1890

1891 1892 1893
    bs = bdrv_lookup_bs(has_device ? device : NULL,
                        has_node_name ? node_name : NULL,
                        &local_err);
1894
    if (local_err) {
1895
        error_propagate(errp, local_err);
L
Luiz Capitulino 已提交
1896
        return;
1897 1898
    }

1899 1900 1901
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

1902
    bdrv_add_key(bs, password, errp);
1903 1904

    aio_context_release(aio_context);
1905 1906
}

1907
/* Assumes AioContext is held */
M
Max Reitz 已提交
1908 1909
static void qmp_bdrv_open_encrypted(BlockDriverState **pbs,
                                    const char *filename,
1910
                                    int bdrv_flags, const char *format,
L
Luiz Capitulino 已提交
1911 1912
                                    const char *password, Error **errp)
{
1913
    Error *local_err = NULL;
1914
    QDict *options = NULL;
1915 1916
    int ret;

1917 1918 1919 1920 1921
    if (format) {
        options = qdict_new();
        qdict_put(options, "driver", qstring_from_str(format));
    }

M
Max Reitz 已提交
1922
    ret = bdrv_open(pbs, filename, NULL, options, bdrv_flags, &local_err);
1923
    if (ret < 0) {
1924
        error_propagate(errp, local_err);
L
Luiz Capitulino 已提交
1925 1926 1927
        return;
    }

M
Max Reitz 已提交
1928
    bdrv_add_key(*pbs, password, errp);
L
Luiz Capitulino 已提交
1929 1930 1931
}

void qmp_change_blockdev(const char *device, const char *filename,
1932
                         const char *format, Error **errp)
1933
{
1934
    BlockBackend *blk;
1935
    BlockDriverState *bs;
1936
    AioContext *aio_context;
1937
    int bdrv_flags;
M
Max Reitz 已提交
1938
    bool new_bs;
1939
    Error *err = NULL;
1940

1941 1942
    blk = blk_by_name(device);
    if (!blk) {
1943 1944
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
L
Luiz Capitulino 已提交
1945
        return;
1946
    }
1947
    bs = blk_bs(blk);
M
Max Reitz 已提交
1948
    new_bs = !bs;
L
Luiz Capitulino 已提交
1949

M
Max Reitz 已提交
1950
    aio_context = blk_get_aio_context(blk);
1951 1952
    aio_context_acquire(aio_context);

1953
    eject_device(blk, 0, &err);
1954
    if (err) {
L
Luiz Capitulino 已提交
1955
        error_propagate(errp, err);
1956
        goto out;
1957
    }
L
Luiz Capitulino 已提交
1958

M
Max Reitz 已提交
1959 1960 1961 1962 1963 1964 1965 1966
    bdrv_flags = blk_is_read_only(blk) ? 0 : BDRV_O_RDWR;
    bdrv_flags |= blk_get_root_state(blk)->open_flags & ~BDRV_O_RDWR;

    qmp_bdrv_open_encrypted(&bs, filename, bdrv_flags, format, NULL, &err);
    if (err) {
        error_propagate(errp, err);
        goto out;
    }
L
Luiz Capitulino 已提交
1967

M
Max Reitz 已提交
1968 1969 1970 1971 1972 1973
    if (new_bs) {
        blk_insert_bs(blk, bs);
        /* Has been sent automatically by bdrv_open() if blk_bs(blk) was not
         * NULL */
        blk_dev_change_media_cb(blk, true);
    }
1974 1975 1976

out:
    aio_context_release(aio_context);
1977
}
1978

Z
Zhi Yong Wu 已提交
1979
/* throttling disk I/O limits */
1980
void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995
                               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,
1996 1997
                               int64_t iops_wr_max,
                               bool has_iops_size,
1998 1999 2000
                               int64_t iops_size,
                               bool has_group,
                               const char *group, Error **errp)
Z
Zhi Yong Wu 已提交
2001
{
2002
    ThrottleConfig cfg;
Z
Zhi Yong Wu 已提交
2003
    BlockDriverState *bs;
2004
    BlockBackend *blk;
2005
    AioContext *aio_context;
Z
Zhi Yong Wu 已提交
2006

2007 2008
    blk = blk_by_name(device);
    if (!blk) {
2009 2010
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
2011
        return;
Z
Zhi Yong Wu 已提交
2012
    }
M
Max Reitz 已提交
2013 2014 2015 2016

    aio_context = blk_get_aio_context(blk);
    aio_context_acquire(aio_context);

2017
    bs = blk_bs(blk);
M
Max Reitz 已提交
2018 2019 2020 2021
    if (!bs) {
        error_setg(errp, "Device '%s' has no medium", device);
        goto out;
    }
Z
Zhi Yong Wu 已提交
2022

2023 2024 2025 2026 2027 2028 2029 2030 2031
    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;

2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049
    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;
    }
Z
Zhi Yong Wu 已提交
2050

2051 2052 2053
    if (has_iops_size) {
        cfg.op_size = iops_size;
    }
2054 2055

    if (!check_throttle_config(&cfg, errp)) {
M
Max Reitz 已提交
2056
        goto out;
Z
Zhi Yong Wu 已提交
2057 2058
    }

2059 2060 2061 2062 2063 2064 2065 2066 2067
    if (throttle_enabled(&cfg)) {
        /* Enable I/O limits if they're not enabled yet, otherwise
         * just update the throttling group. */
        if (!bs->io_limits_enabled) {
            bdrv_io_limits_enable(bs, has_group ? group : device);
        } else if (has_group) {
            bdrv_io_limits_update_group(bs, group);
        }
        /* Set the new throttling configuration */
2068
        bdrv_set_io_limits(bs, &cfg);
2069 2070 2071
    } else if (bs->io_limits_enabled) {
        /* If all throttling settings are set to 0, disable I/O limits */
        bdrv_io_limits_disable(bs);
Z
Zhi Yong Wu 已提交
2072
    }
2073

M
Max Reitz 已提交
2074
out:
2075
    aio_context_release(aio_context);
Z
Zhi Yong Wu 已提交
2076 2077
}

2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126
void qmp_block_dirty_bitmap_add(const char *node, const char *name,
                                bool has_granularity, uint32_t granularity,
                                Error **errp)
{
    AioContext *aio_context;
    BlockDriverState *bs;

    if (!name || name[0] == '\0') {
        error_setg(errp, "Bitmap name cannot be empty");
        return;
    }

    bs = bdrv_lookup_bs(node, node, errp);
    if (!bs) {
        return;
    }

    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

    if (has_granularity) {
        if (granularity < 512 || !is_power_of_2(granularity)) {
            error_setg(errp, "Granularity must be power of 2 "
                             "and at least 512");
            goto out;
        }
    } else {
        /* Default to cluster size, if available: */
        granularity = bdrv_get_default_bitmap_granularity(bs);
    }

    bdrv_create_dirty_bitmap(bs, granularity, name, errp);

 out:
    aio_context_release(aio_context);
}

void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
                                   Error **errp)
{
    AioContext *aio_context;
    BlockDriverState *bs;
    BdrvDirtyBitmap *bitmap;

    bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
    if (!bitmap || !bs) {
        return;
    }

J
John Snow 已提交
2127 2128 2129 2130 2131 2132
    if (bdrv_dirty_bitmap_frozen(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently frozen and cannot be removed",
                   name);
        goto out;
    }
2133
    bdrv_dirty_bitmap_make_anon(bitmap);
2134 2135
    bdrv_release_dirty_bitmap(bs, bitmap);

J
John Snow 已提交
2136
 out:
2137 2138 2139
    aio_context_release(aio_context);
}

J
John Snow 已提交
2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173
/**
 * Completely clear a bitmap, for the purposes of synchronizing a bitmap
 * immediately after a full backup operation.
 */
void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
                                  Error **errp)
{
    AioContext *aio_context;
    BdrvDirtyBitmap *bitmap;
    BlockDriverState *bs;

    bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
    if (!bitmap || !bs) {
        return;
    }

    if (bdrv_dirty_bitmap_frozen(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently frozen and cannot be modified",
                   name);
        goto out;
    } else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
        error_setg(errp,
                   "Bitmap '%s' is currently disabled and cannot be cleared",
                   name);
        goto out;
    }

    bdrv_clear_dirty_bitmap(bitmap);

 out:
    aio_context_release(aio_context);
}

2174
void hmp_drive_del(Monitor *mon, const QDict *qdict)
2175 2176
{
    const char *id = qdict_get_str(qdict, "id");
2177
    BlockBackend *blk;
2178
    BlockDriverState *bs;
2179
    AioContext *aio_context;
2180
    Error *local_err = NULL;
2181

2182 2183
    blk = blk_by_name(id);
    if (!blk) {
2184
        error_report("Device '%s' not found", id);
2185
        return;
2186
    }
2187

2188
    if (!blk_legacy_dinfo(blk)) {
2189 2190
        error_report("Deleting device added with blockdev-add"
                     " is not supported");
2191
        return;
2192 2193
    }

M
Max Reitz 已提交
2194
    aio_context = blk_get_aio_context(blk);
2195 2196
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
2197 2198 2199 2200 2201 2202 2203
    bs = blk_bs(blk);
    if (bs) {
        if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
            error_report_err(local_err);
            aio_context_release(aio_context);
            return;
        }
2204

M
Max Reitz 已提交
2205 2206
        bdrv_close(bs);
    }
2207

2208
    /* if we have a device attached to this BlockDriverState
2209 2210 2211 2212
     * 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.
     */
2213
    if (blk_get_attached_dev(blk)) {
2214
        blk_hide_on_behalf_of_hmp_drive_del(blk);
2215
        /* Further I/O must not pause the guest */
2216 2217
        blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
                         BLOCKDEV_ON_ERROR_REPORT);
2218
    } else {
2219
        blk_unref(blk);
2220 2221
    }

2222
    aio_context_release(aio_context);
2223
}
2224

2225 2226 2227
void qmp_block_resize(bool has_device, const char *device,
                      bool has_node_name, const char *node_name,
                      int64_t size, Error **errp)
2228
{
2229
    Error *local_err = NULL;
2230
    BlockDriverState *bs;
2231
    AioContext *aio_context;
2232
    int ret;
2233

2234 2235 2236
    bs = bdrv_lookup_bs(has_device ? device : NULL,
                        has_node_name ? node_name : NULL,
                        &local_err);
2237
    if (local_err) {
2238 2239 2240 2241
        error_propagate(errp, local_err);
        return;
    }

2242 2243 2244
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

2245
    if (!bdrv_is_first_non_filter(bs)) {
2246
        error_setg(errp, QERR_FEATURE_DISABLED, "resize");
2247
        goto out;
2248 2249 2250
    }

    if (size < 0) {
2251
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2252
        goto out;
2253 2254
    }

2255
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2256
        error_setg(errp, QERR_DEVICE_IN_USE, device);
2257
        goto out;
2258 2259
    }

2260 2261 2262
    /* complete all in-flight operations before resizing the device */
    bdrv_drain_all();

2263 2264
    ret = bdrv_truncate(bs, size);
    switch (ret) {
2265 2266 2267
    case 0:
        break;
    case -ENOMEDIUM:
2268
        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2269 2270
        break;
    case -ENOTSUP:
2271
        error_setg(errp, QERR_UNSUPPORTED);
2272 2273
        break;
    case -EACCES:
2274
        error_setg(errp, "Device '%s' is read only", device);
2275 2276
        break;
    case -EBUSY:
2277
        error_setg(errp, QERR_DEVICE_IN_USE, device);
2278 2279
        break;
    default:
2280
        error_setg_errno(errp, -ret, "Could not resize");
2281
        break;
2282
    }
2283 2284 2285

out:
    aio_context_release(aio_context);
2286
}
S
Stefan Hajnoczi 已提交
2287

2288
static void block_job_cb(void *opaque, int ret)
S
Stefan Hajnoczi 已提交
2289
{
2290 2291 2292 2293 2294
    /* 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.
     */

S
Stefan Hajnoczi 已提交
2295
    BlockDriverState *bs = opaque;
2296
    const char *msg = NULL;
S
Stefan Hajnoczi 已提交
2297

2298
    trace_block_job_cb(bs, bs->job, ret);
S
Stefan Hajnoczi 已提交
2299 2300

    assert(bs->job);
2301

S
Stefan Hajnoczi 已提交
2302
    if (ret < 0) {
2303
        msg = strerror(-ret);
S
Stefan Hajnoczi 已提交
2304 2305
    }

2306
    if (block_job_is_cancelled(bs->job)) {
2307
        block_job_event_cancelled(bs->job);
2308
    } else {
2309
        block_job_event_completed(bs->job, msg);
2310
    }
2311

F
Fam Zheng 已提交
2312
    bdrv_put_ref_bh_schedule(bs);
S
Stefan Hajnoczi 已提交
2313 2314
}

2315 2316 2317 2318
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,
P
Paolo Bonzini 已提交
2319 2320
                      bool has_on_error, BlockdevOnError on_error,
                      Error **errp)
S
Stefan Hajnoczi 已提交
2321
{
2322
    BlockBackend *blk;
S
Stefan Hajnoczi 已提交
2323
    BlockDriverState *bs;
2324
    BlockDriverState *base_bs = NULL;
2325
    AioContext *aio_context;
2326
    Error *local_err = NULL;
2327
    const char *base_name = NULL;
S
Stefan Hajnoczi 已提交
2328

P
Paolo Bonzini 已提交
2329 2330 2331 2332
    if (!has_on_error) {
        on_error = BLOCKDEV_ON_ERROR_REPORT;
    }

2333 2334
    blk = blk_by_name(device);
    if (!blk) {
2335 2336
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
S
Stefan Hajnoczi 已提交
2337 2338 2339
        return;
    }

M
Max Reitz 已提交
2340
    aio_context = blk_get_aio_context(blk);
2341 2342
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
2343 2344 2345 2346 2347 2348
    if (!blk_is_available(blk)) {
        error_setg(errp, "Device '%s' has no medium", device);
        goto out;
    }
    bs = blk_bs(blk);

2349
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2350
        goto out;
2351 2352
    }

2353
    if (has_base) {
2354 2355
        base_bs = bdrv_find_backing_image(bs, base);
        if (base_bs == NULL) {
2356
            error_setg(errp, QERR_BASE_NOT_FOUND, base);
2357
            goto out;
2358
        }
2359
        assert(bdrv_get_aio_context(base_bs) == aio_context);
2360
        base_name = base;
S
Stefan Hajnoczi 已提交
2361 2362
    }

2363 2364 2365 2366 2367
    /* 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");
2368
        goto out;
2369 2370 2371 2372 2373 2374
    }

    /* 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,
P
Paolo Bonzini 已提交
2375
                 on_error, block_job_cb, bs, &local_err);
2376
    if (local_err) {
2377
        error_propagate(errp, local_err);
2378
        goto out;
S
Stefan Hajnoczi 已提交
2379 2380 2381
    }

    trace_qmp_block_stream(bs, bs->job);
2382 2383 2384

out:
    aio_context_release(aio_context);
S
Stefan Hajnoczi 已提交
2385
}
2386

2387
void qmp_block_commit(const char *device,
2388 2389
                      bool has_base, const char *base,
                      bool has_top, const char *top,
2390
                      bool has_backing_file, const char *backing_file,
2391 2392 2393
                      bool has_speed, int64_t speed,
                      Error **errp)
{
2394
    BlockBackend *blk;
2395 2396
    BlockDriverState *bs;
    BlockDriverState *base_bs, *top_bs;
2397
    AioContext *aio_context;
2398 2399 2400 2401
    Error *local_err = NULL;
    /* This will be part of the QMP command, if/when the
     * BlockdevOnError change for blkmirror makes it in
     */
2402
    BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2403

2404 2405 2406 2407
    if (!has_speed) {
        speed = 0;
    }

2408 2409 2410 2411 2412
    /* 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. */
2413 2414
    blk = blk_by_name(device);
    if (!blk) {
2415 2416
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
2417
        return;
2418 2419
    }

M
Max Reitz 已提交
2420
    aio_context = blk_get_aio_context(blk);
2421 2422
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
2423 2424 2425 2426 2427 2428
    if (!blk_is_available(blk)) {
        error_setg(errp, "Device '%s' has no medium", device);
        goto out;
    }
    bs = blk_bs(blk);

2429
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2430
        goto out;
2431 2432 2433 2434 2435
    }

    /* default top_bs is the active layer */
    top_bs = bs;

2436
    if (has_top && top) {
2437 2438 2439 2440 2441 2442 2443
        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");
2444
        goto out;
2445 2446
    }

2447 2448
    assert(bdrv_get_aio_context(top_bs) == aio_context);

2449 2450 2451 2452 2453 2454 2455
    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) {
2456
        error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2457
        goto out;
2458 2459
    }

2460 2461
    assert(bdrv_get_aio_context(base_bs) == aio_context);

2462 2463 2464 2465
    if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
        goto out;
    }

2466 2467 2468
    /* Do not allow attempts to commit an image into itself */
    if (top_bs == base_bs) {
        error_setg(errp, "cannot commit an image into itself");
2469
        goto out;
2470 2471
    }

F
Fam Zheng 已提交
2472
    if (top_bs == bs) {
2473 2474 2475
        if (has_backing_file) {
            error_setg(errp, "'backing-file' specified,"
                             " but 'top' is the active layer");
2476
            goto out;
2477
        }
F
Fam Zheng 已提交
2478 2479 2480 2481
        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,
2482
                     has_backing_file ? backing_file : NULL, &local_err);
F
Fam Zheng 已提交
2483
    }
2484 2485
    if (local_err != NULL) {
        error_propagate(errp, local_err);
2486
        goto out;
2487
    }
2488 2489 2490

out:
    aio_context_release(aio_context);
2491 2492
}

2493 2494
void qmp_drive_backup(const char *device, const char *target,
                      bool has_format, const char *format,
2495
                      enum MirrorSyncMode sync,
2496 2497
                      bool has_mode, enum NewImageMode mode,
                      bool has_speed, int64_t speed,
2498
                      bool has_bitmap, const char *bitmap,
2499 2500 2501 2502
                      bool has_on_source_error, BlockdevOnError on_source_error,
                      bool has_on_target_error, BlockdevOnError on_target_error,
                      Error **errp)
{
2503
    BlockBackend *blk;
2504 2505
    BlockDriverState *bs;
    BlockDriverState *target_bs;
2506
    BlockDriverState *source = NULL;
2507
    BdrvDirtyBitmap *bmap = NULL;
2508
    AioContext *aio_context;
2509
    QDict *options = NULL;
2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527
    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;
    }

2528 2529
    blk = blk_by_name(device);
    if (!blk) {
2530 2531
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
2532 2533 2534
        return;
    }

M
Max Reitz 已提交
2535
    aio_context = blk_get_aio_context(blk);
2536 2537
    aio_context_acquire(aio_context);

F
Fam Zheng 已提交
2538 2539
    /* Although backup_run has this check too, we need to use bs->drv below, so
     * do an early check redundantly. */
M
Max Reitz 已提交
2540
    if (!blk_is_available(blk)) {
2541
        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2542
        goto out;
2543
    }
M
Max Reitz 已提交
2544
    bs = blk_bs(blk);
2545 2546 2547 2548 2549

    if (!has_format) {
        format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
    }

F
Fam Zheng 已提交
2550
    /* Early check to avoid creating target */
2551
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2552
        goto out;
2553 2554 2555 2556
    }

    flags = bs->open_flags | BDRV_O_RDWR;

2557 2558 2559
    /* See if we have a backing HD we can use to create our new image
     * on top of. */
    if (sync == MIRROR_SYNC_MODE_TOP) {
2560
        source = backing_bs(bs);
2561 2562 2563 2564 2565 2566 2567 2568
        if (!source) {
            sync = MIRROR_SYNC_MODE_FULL;
        }
    }
    if (sync == MIRROR_SYNC_MODE_NONE) {
        source = bs;
    }

2569 2570 2571
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
2572
        goto out;
2573 2574 2575
    }

    if (mode != NEW_IMAGE_MODE_EXISTING) {
2576
        assert(format);
2577 2578 2579 2580 2581 2582 2583 2584
        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);
        }
2585 2586
    }

2587
    if (local_err) {
2588
        error_propagate(errp, local_err);
2589
        goto out;
2590 2591
    }

2592 2593 2594 2595 2596
    if (format) {
        options = qdict_new();
        qdict_put(options, "driver", qstring_from_str(format));
    }

2597
    target_bs = NULL;
2598
    ret = bdrv_open(&target_bs, target, NULL, options, flags, &local_err);
2599
    if (ret < 0) {
2600
        error_propagate(errp, local_err);
2601
        goto out;
2602 2603
    }

2604 2605
    bdrv_set_aio_context(target_bs, aio_context);

2606 2607 2608 2609 2610 2611 2612 2613 2614 2615
    if (has_bitmap) {
        bmap = bdrv_find_dirty_bitmap(bs, bitmap);
        if (!bmap) {
            error_setg(errp, "Bitmap '%s' could not be found", bitmap);
            goto out;
        }
    }

    backup_start(bs, target_bs, speed, sync, bmap,
                 on_source_error, on_target_error,
2616 2617
                 block_job_cb, bs, &local_err);
    if (local_err != NULL) {
F
Fam Zheng 已提交
2618
        bdrv_unref(target_bs);
2619
        error_propagate(errp, local_err);
2620
        goto out;
2621
    }
2622 2623 2624

out:
    aio_context_release(aio_context);
2625 2626
}

2627 2628
BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
{
2629
    return bdrv_named_nodes_list(errp);
2630 2631
}

F
Fam Zheng 已提交
2632 2633 2634 2635 2636 2637 2638 2639 2640
void qmp_blockdev_backup(const char *device, const char *target,
                         enum MirrorSyncMode sync,
                         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)
{
M
Max Reitz 已提交
2641
    BlockBackend *blk, *target_blk;
F
Fam Zheng 已提交
2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656
    BlockDriverState *bs;
    BlockDriverState *target_bs;
    Error *local_err = NULL;
    AioContext *aio_context;

    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;
    }

2657 2658
    blk = blk_by_name(device);
    if (!blk) {
2659
        error_setg(errp, "Device '%s' not found", device);
F
Fam Zheng 已提交
2660 2661 2662
        return;
    }

M
Max Reitz 已提交
2663
    aio_context = blk_get_aio_context(blk);
F
Fam Zheng 已提交
2664 2665
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
2666 2667 2668 2669 2670 2671 2672 2673
    if (!blk_is_available(blk)) {
        error_setg(errp, "Device '%s' has no medium", device);
        goto out;
    }
    bs = blk_bs(blk);

    target_blk = blk_by_name(target);
    if (!target_blk) {
2674
        error_setg(errp, "Device '%s' not found", target);
F
Fam Zheng 已提交
2675 2676
        goto out;
    }
M
Max Reitz 已提交
2677 2678 2679 2680 2681 2682

    if (!blk_is_available(target_blk)) {
        error_setg(errp, "Device '%s' has no medium", target);
        goto out;
    }
    target_bs = blk_bs(target_blk);
F
Fam Zheng 已提交
2683 2684 2685

    bdrv_ref(target_bs);
    bdrv_set_aio_context(target_bs, aio_context);
2686 2687
    backup_start(bs, target_bs, speed, sync, NULL, on_source_error,
                 on_target_error, block_job_cb, bs, &local_err);
F
Fam Zheng 已提交
2688 2689 2690 2691 2692 2693 2694 2695
    if (local_err != NULL) {
        bdrv_unref(target_bs);
        error_propagate(errp, local_err);
    }
out:
    aio_context_release(aio_context);
}

P
Paolo Bonzini 已提交
2696 2697
void qmp_drive_mirror(const char *device, const char *target,
                      bool has_format, const char *format,
2698
                      bool has_node_name, const char *node_name,
2699
                      bool has_replaces, const char *replaces,
P
Paolo Bonzini 已提交
2700 2701
                      enum MirrorSyncMode sync,
                      bool has_mode, enum NewImageMode mode,
2702
                      bool has_speed, int64_t speed,
2703
                      bool has_granularity, uint32_t granularity,
2704
                      bool has_buf_size, int64_t buf_size,
2705 2706
                      bool has_on_source_error, BlockdevOnError on_source_error,
                      bool has_on_target_error, BlockdevOnError on_target_error,
2707
                      bool has_unmap, bool unmap,
2708
                      Error **errp)
P
Paolo Bonzini 已提交
2709
{
2710
    BlockBackend *blk;
P
Paolo Bonzini 已提交
2711 2712
    BlockDriverState *bs;
    BlockDriverState *source, *target_bs;
2713
    AioContext *aio_context;
P
Paolo Bonzini 已提交
2714
    Error *local_err = NULL;
2715
    QDict *options;
P
Paolo Bonzini 已提交
2716
    int flags;
2717
    int64_t size;
P
Paolo Bonzini 已提交
2718 2719 2720 2721 2722
    int ret;

    if (!has_speed) {
        speed = 0;
    }
2723 2724 2725 2726 2727 2728
    if (!has_on_source_error) {
        on_source_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_on_target_error) {
        on_target_error = BLOCKDEV_ON_ERROR_REPORT;
    }
P
Paolo Bonzini 已提交
2729 2730 2731
    if (!has_mode) {
        mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
    }
2732 2733 2734
    if (!has_granularity) {
        granularity = 0;
    }
2735
    if (!has_buf_size) {
W
Wen Congyang 已提交
2736
        buf_size = 0;
2737
    }
2738 2739 2740
    if (!has_unmap) {
        unmap = true;
    }
2741

2742
    if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2743 2744
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
                   "a value in range [512B, 64MB]");
2745 2746 2747
        return;
    }
    if (granularity & (granularity - 1)) {
2748 2749
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
                   "power of 2");
2750 2751
        return;
    }
P
Paolo Bonzini 已提交
2752

2753 2754
    blk = blk_by_name(device);
    if (!blk) {
2755 2756
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
P
Paolo Bonzini 已提交
2757 2758 2759
        return;
    }

M
Max Reitz 已提交
2760
    aio_context = blk_get_aio_context(blk);
2761 2762
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
2763
    if (!blk_is_available(blk)) {
2764
        error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2765
        goto out;
P
Paolo Bonzini 已提交
2766
    }
M
Max Reitz 已提交
2767
    bs = blk_bs(blk);
P
Paolo Bonzini 已提交
2768 2769 2770 2771 2772

    if (!has_format) {
        format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
    }

2773
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2774
        goto out;
P
Paolo Bonzini 已提交
2775 2776 2777
    }

    flags = bs->open_flags | BDRV_O_RDWR;
2778
    source = backing_bs(bs);
P
Paolo Bonzini 已提交
2779 2780 2781
    if (!source && sync == MIRROR_SYNC_MODE_TOP) {
        sync = MIRROR_SYNC_MODE_FULL;
    }
2782 2783 2784
    if (sync == MIRROR_SYNC_MODE_NONE) {
        source = bs;
    }
P
Paolo Bonzini 已提交
2785

2786 2787 2788
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
2789
        goto out;
2790 2791
    }

2792 2793
    if (has_replaces) {
        BlockDriverState *to_replace_bs;
2794 2795
        AioContext *replace_aio_context;
        int64_t replace_size;
2796 2797 2798 2799

        if (!has_node_name) {
            error_setg(errp, "a node-name must be provided when replacing a"
                             " named node of the graph");
2800
            goto out;
2801 2802
        }

2803
        to_replace_bs = check_to_replace_node(bs, replaces, &local_err);
2804 2805 2806

        if (!to_replace_bs) {
            error_propagate(errp, local_err);
2807
            goto out;
2808 2809
        }

2810 2811 2812 2813 2814 2815
        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) {
2816 2817
            error_setg(errp, "cannot replace image with a mirror image of "
                             "different size");
2818
            goto out;
2819 2820 2821
        }
    }

2822 2823 2824
    if ((sync == MIRROR_SYNC_MODE_FULL || !source)
        && mode != NEW_IMAGE_MODE_EXISTING)
    {
P
Paolo Bonzini 已提交
2825
        /* create new image w/o backing file */
2826
        assert(format);
2827
        bdrv_img_create(target, format,
2828
                        NULL, NULL, NULL, size, flags, &local_err, false);
P
Paolo Bonzini 已提交
2829 2830 2831 2832 2833 2834
    } else {
        switch (mode) {
        case NEW_IMAGE_MODE_EXISTING:
            break;
        case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
            /* create new image with backing file */
2835 2836 2837
            bdrv_img_create(target, format,
                            source->filename,
                            source->drv->format_name,
2838
                            NULL, size, flags, &local_err, false);
P
Paolo Bonzini 已提交
2839 2840 2841 2842 2843 2844
            break;
        default:
            abort();
        }
    }

2845
    if (local_err) {
2846
        error_propagate(errp, local_err);
2847
        goto out;
P
Paolo Bonzini 已提交
2848 2849
    }

2850
    options = qdict_new();
2851 2852 2853
    if (has_node_name) {
        qdict_put(options, "node-name", qstring_from_str(node_name));
    }
2854 2855 2856
    if (format) {
        qdict_put(options, "driver", qstring_from_str(format));
    }
2857

2858 2859 2860
    /* Mirroring takes care of copy-on-write using the source's backing
     * file.
     */
2861
    target_bs = NULL;
2862
    ret = bdrv_open(&target_bs, target, NULL, options,
2863
                    flags | BDRV_O_NO_BACKING, &local_err);
P
Paolo Bonzini 已提交
2864
    if (ret < 0) {
2865
        error_propagate(errp, local_err);
2866
        goto out;
P
Paolo Bonzini 已提交
2867 2868
    }

2869 2870
    bdrv_set_aio_context(target_bs, aio_context);

2871 2872 2873 2874 2875 2876
    /* 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,
2877
                 on_source_error, on_target_error,
2878
                 unmap,
2879
                 block_job_cb, bs, &local_err);
P
Paolo Bonzini 已提交
2880
    if (local_err != NULL) {
F
Fam Zheng 已提交
2881
        bdrv_unref(target_bs);
P
Paolo Bonzini 已提交
2882
        error_propagate(errp, local_err);
2883
        goto out;
P
Paolo Bonzini 已提交
2884
    }
2885 2886 2887

out:
    aio_context_release(aio_context);
P
Paolo Bonzini 已提交
2888 2889
}

2890
/* Get the block job for a given device name and acquire its AioContext */
2891 2892
static BlockJob *find_block_job(const char *device, AioContext **aio_context,
                                Error **errp)
2893
{
2894
    BlockBackend *blk;
2895 2896
    BlockDriverState *bs;

M
Max Reitz 已提交
2897 2898
    *aio_context = NULL;

2899 2900
    blk = blk_by_name(device);
    if (!blk) {
2901 2902 2903
        goto notfound;
    }

M
Max Reitz 已提交
2904
    *aio_context = blk_get_aio_context(blk);
2905 2906
    aio_context_acquire(*aio_context);

M
Max Reitz 已提交
2907 2908 2909 2910 2911
    if (!blk_is_available(blk)) {
        goto notfound;
    }
    bs = blk_bs(blk);

2912 2913
    if (!bs->job) {
        goto notfound;
2914
    }
2915

2916
    return bs->job;
2917 2918

notfound:
2919 2920
    error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
              "No active block job on device '%s'", device);
M
Max Reitz 已提交
2921 2922 2923 2924
    if (*aio_context) {
        aio_context_release(*aio_context);
        *aio_context = NULL;
    }
2925
    return NULL;
2926 2927
}

2928
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2929
{
2930
    AioContext *aio_context;
2931
    BlockJob *job = find_block_job(device, &aio_context, errp);
2932 2933 2934 2935 2936

    if (!job) {
        return;
    }

2937
    block_job_set_speed(job, speed, errp);
2938
    aio_context_release(aio_context);
2939
}
2940

2941 2942
void qmp_block_job_cancel(const char *device,
                          bool has_force, bool force, Error **errp)
2943
{
2944
    AioContext *aio_context;
2945
    BlockJob *job = find_block_job(device, &aio_context, errp);
2946

2947 2948 2949
    if (!job) {
        return;
    }
2950 2951 2952 2953 2954

    if (!has_force) {
        force = false;
    }

F
Fam Zheng 已提交
2955
    if (job->user_paused && !force) {
2956 2957
        error_setg(errp, "The block job for device '%s' is currently paused",
                   device);
2958
        goto out;
2959
    }
2960 2961 2962

    trace_qmp_block_job_cancel(job);
    block_job_cancel(job);
2963 2964
out:
    aio_context_release(aio_context);
2965
}
S
Stefan Hajnoczi 已提交
2966

2967 2968
void qmp_block_job_pause(const char *device, Error **errp)
{
2969
    AioContext *aio_context;
2970
    BlockJob *job = find_block_job(device, &aio_context, errp);
2971

F
Fam Zheng 已提交
2972
    if (!job || job->user_paused) {
2973 2974 2975
        return;
    }

F
Fam Zheng 已提交
2976
    job->user_paused = true;
2977 2978
    trace_qmp_block_job_pause(job);
    block_job_pause(job);
2979
    aio_context_release(aio_context);
2980 2981 2982 2983
}

void qmp_block_job_resume(const char *device, Error **errp)
{
2984
    AioContext *aio_context;
2985
    BlockJob *job = find_block_job(device, &aio_context, errp);
2986

F
Fam Zheng 已提交
2987
    if (!job || !job->user_paused) {
2988 2989 2990
        return;
    }

F
Fam Zheng 已提交
2991
    job->user_paused = false;
2992 2993
    trace_qmp_block_job_resume(job);
    block_job_resume(job);
2994
    aio_context_release(aio_context);
2995 2996
}

P
Paolo Bonzini 已提交
2997 2998
void qmp_block_job_complete(const char *device, Error **errp)
{
2999
    AioContext *aio_context;
3000
    BlockJob *job = find_block_job(device, &aio_context, errp);
P
Paolo Bonzini 已提交
3001 3002 3003 3004 3005 3006 3007

    if (!job) {
        return;
    }

    trace_qmp_block_job_complete(job);
    block_job_complete(job, errp);
3008
    aio_context_release(aio_context);
P
Paolo Bonzini 已提交
3009 3010
}

3011 3012 3013 3014 3015
void qmp_change_backing_file(const char *device,
                             const char *image_node_name,
                             const char *backing_file,
                             Error **errp)
{
3016
    BlockBackend *blk;
3017
    BlockDriverState *bs = NULL;
3018
    AioContext *aio_context;
3019 3020 3021 3022 3023 3024
    BlockDriverState *image_bs = NULL;
    Error *local_err = NULL;
    bool ro;
    int open_flags;
    int ret;

3025 3026
    blk = blk_by_name(device);
    if (!blk) {
3027 3028
        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                  "Device '%s' not found", device);
3029 3030 3031
        return;
    }

M
Max Reitz 已提交
3032
    aio_context = blk_get_aio_context(blk);
3033 3034
    aio_context_acquire(aio_context);

M
Max Reitz 已提交
3035 3036 3037 3038 3039 3040
    if (!blk_is_available(blk)) {
        error_setg(errp, "Device '%s' has no medium", device);
        goto out;
    }
    bs = blk_bs(blk);

3041 3042 3043
    image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
3044
        goto out;
3045 3046 3047 3048
    }

    if (!image_bs) {
        error_setg(errp, "image file not found");
3049
        goto out;
3050 3051 3052 3053 3054
    }

    if (bdrv_find_base(image_bs) == image_bs) {
        error_setg(errp, "not allowing backing file change on an image "
                         "without a backing file");
3055
        goto out;
3056 3057 3058 3059 3060
    }

    /* 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)) {
3061
        goto out;
3062 3063 3064 3065 3066 3067
    }

    /* final sanity check */
    if (!bdrv_chain_contains(bs, image_bs)) {
        error_setg(errp, "'%s' and image file are not in the same chain",
                   device);
3068
        goto out;
3069 3070 3071 3072 3073 3074 3075 3076 3077 3078
    }

    /* 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);
3079
            goto out;
3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098
        }
    }

    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 */
        }
    }
3099 3100 3101

out:
    aio_context_release(aio_context);
3102 3103
}

K
Kevin Wolf 已提交
3104 3105 3106
void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
{
    QmpOutputVisitor *ov = qmp_output_visitor_new();
3107 3108
    BlockDriverState *bs;
    BlockBackend *blk = NULL;
K
Kevin Wolf 已提交
3109 3110 3111 3112
    QObject *obj;
    QDict *qdict;
    Error *local_err = NULL;

3113
    /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
K
Kevin Wolf 已提交
3114
     * cache.direct=false instead of silently switching to aio=threads, except
3115
     * when called from drive_new().
K
Kevin Wolf 已提交
3116 3117 3118
     *
     * For now, simply forbidding the combination for all drivers will do. */
    if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
3119 3120 3121 3122
        bool direct = options->has_cache &&
                      options->cache->has_direct &&
                      options->cache->direct;
        if (!direct) {
K
Kevin Wolf 已提交
3123 3124 3125 3126 3127 3128 3129
            error_setg(errp, "aio=native requires cache.direct=true");
            goto fail;
        }
    }

    visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
                               &options, NULL, &local_err);
3130
    if (local_err) {
K
Kevin Wolf 已提交
3131 3132 3133 3134 3135 3136 3137 3138 3139
        error_propagate(errp, local_err);
        goto fail;
    }

    obj = qmp_output_get_qobject(ov);
    qdict = qobject_to_qdict(obj);

    qdict_flatten(qdict);

3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162
    if (options->has_id) {
        blk = blockdev_init(NULL, qdict, &local_err);
        if (local_err) {
            error_propagate(errp, local_err);
            goto fail;
        }

        bs = blk_bs(blk);
    } else {
        int ret;

        if (!qdict_get_try_str(qdict, "node-name")) {
            error_setg(errp, "'id' and/or 'node-name' need to be specified for "
                       "the root node");
            goto fail;
        }

        bs = NULL;
        ret = bdrv_open(&bs, NULL, NULL, qdict, BDRV_O_RDWR | BDRV_O_CACHE_WB,
                        errp);
        if (ret < 0) {
            goto fail;
        }
K
Kevin Wolf 已提交
3163 3164
    }

3165 3166 3167 3168 3169 3170
    if (bs && bdrv_key_required(bs)) {
        if (blk) {
            blk_unref(blk);
        } else {
            bdrv_unref(bs);
        }
3171 3172 3173 3174
        error_setg(errp, "blockdev-add doesn't support encrypted devices");
        goto fail;
    }

K
Kevin Wolf 已提交
3175 3176 3177 3178
fail:
    qmp_output_visitor_cleanup(ov);
}

3179
BlockJobInfoList *qmp_query_block_jobs(Error **errp)
S
Stefan Hajnoczi 已提交
3180
{
3181 3182
    BlockJobInfoList *head = NULL, **p_next = &head;
    BlockDriverState *bs;
S
Stefan Hajnoczi 已提交
3183

3184
    for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
3185 3186 3187 3188
        AioContext *aio_context = bdrv_get_aio_context(bs);

        aio_context_acquire(aio_context);

3189 3190 3191 3192 3193 3194
        if (bs->job) {
            BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
            elem->value = block_job_query(bs->job);
            *p_next = elem;
            p_next = &elem->next;
        }
3195 3196

        aio_context_release(aio_context);
S
Stefan Hajnoczi 已提交
3197 3198
    }

3199
    return head;
S
Stefan Hajnoczi 已提交
3200
}
3201

3202
QemuOptsList qemu_common_drive_opts = {
3203
    .name = "drive",
3204
    .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3205 3206 3207 3208 3209
    .desc = {
        {
            .name = "snapshot",
            .type = QEMU_OPT_BOOL,
            .help = "enable/disable snapshot mode",
3210 3211 3212 3213
        },{
            .name = "discard",
            .type = QEMU_OPT_STRING,
            .help = "discard operation (ignore/off, unmap/on)",
3214
        },{
3215
            .name = BDRV_OPT_CACHE_WB,
K
Kevin Wolf 已提交
3216 3217 3218
            .type = QEMU_OPT_BOOL,
            .help = "enables writeback mode for any caches",
        },{
3219
            .name = BDRV_OPT_CACHE_DIRECT,
K
Kevin Wolf 已提交
3220 3221 3222
            .type = QEMU_OPT_BOOL,
            .help = "enables use of O_DIRECT (bypass the host page cache)",
        },{
3223
            .name = BDRV_OPT_CACHE_NO_FLUSH,
K
Kevin Wolf 已提交
3224 3225
            .type = QEMU_OPT_BOOL,
            .help = "ignore any flush requests for the device",
3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242
        },{
            .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",
        },{
3243
            .name = "read-only",
3244 3245 3246
            .type = QEMU_OPT_BOOL,
            .help = "open drive file as read-only",
        },{
3247
            .name = "throttling.iops-total",
3248 3249 3250
            .type = QEMU_OPT_NUMBER,
            .help = "limit total I/O operations per second",
        },{
3251
            .name = "throttling.iops-read",
3252 3253 3254
            .type = QEMU_OPT_NUMBER,
            .help = "limit read operations per second",
        },{
3255
            .name = "throttling.iops-write",
3256 3257 3258
            .type = QEMU_OPT_NUMBER,
            .help = "limit write operations per second",
        },{
3259
            .name = "throttling.bps-total",
3260 3261 3262
            .type = QEMU_OPT_NUMBER,
            .help = "limit total bytes per second",
        },{
3263
            .name = "throttling.bps-read",
3264 3265 3266
            .type = QEMU_OPT_NUMBER,
            .help = "limit read bytes per second",
        },{
3267
            .name = "throttling.bps-write",
3268 3269
            .type = QEMU_OPT_NUMBER,
            .help = "limit write bytes per second",
3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293
        },{
            .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",
3294 3295 3296 3297
        },{
            .name = "throttling.iops-size",
            .type = QEMU_OPT_NUMBER,
            .help = "when limiting by iops max size of an I/O in bytes",
3298 3299 3300 3301
        },{
            .name = "throttling.group",
            .type = QEMU_OPT_STRING,
            .help = "name of the block throttling group",
3302 3303 3304 3305
        },{
            .name = "copy-on-read",
            .type = QEMU_OPT_BOOL,
            .help = "copy read data from backing file into image file",
3306 3307 3308 3309
        },{
            .name = "detect-zeroes",
            .type = QEMU_OPT_STRING,
            .help = "try to optimize zero writes (off, on, unmap)",
3310 3311 3312 3313
        },
        { /* end of list */ }
    },
};
3314 3315 3316 3317 3318

QemuOptsList qemu_drive_opts = {
    .name = "drive",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
    .desc = {
3319 3320 3321 3322
        /*
         * no elements => accept any params
         * validation will happen later
         */
3323 3324 3325
        { /* end of list */ }
    },
};