blockdev.c 88.1 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 "monitor/monitor.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"
#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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    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)
{
    return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
}

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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    char buf[32];
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    opts = drive_def(optstr);
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    if (!opts) {
        return NULL;
    }
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    if (type != IF_DEFAULT) {
        qemu_opt_set(opts, "if", if_name[type]);
    }
    if (index >= 0) {
        snprintf(buf, sizeof(buf), "%d", index);
        qemu_opt_set(opts, "index", buf);
    }
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    if (file)
        qemu_opt_set(opts, "file", file);
    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)->filename, if_name[dinfo->type],
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                    dinfo->bus, dinfo->unit);
            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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    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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    int ret;
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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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    BlockDriver *drv = NULL;
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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);
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    if (error) {
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        error_propagate(errp, error);
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        goto err_no_opts;
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    }

    qemu_opts_absorb_qdict(opts, bs_opts, &error);
375
    if (error) {
376
        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) {
393
            error_setg(errp, "invalid discard option");
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            goto early_err;
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        }
    }

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    if (qemu_opt_get_bool(opts, "cache.writeback", true)) {
        bdrv_flags |= BDRV_O_CACHE_WB;
    }
    if (qemu_opt_get_bool(opts, "cache.direct", false)) {
        bdrv_flags |= BDRV_O_NOCACHE;
    }
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    if (qemu_opt_get_bool(opts, "cache.no-flush", false)) {
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        bdrv_flags |= BDRV_O_NO_FLUSH;
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    }

#ifdef CONFIG_LINUX_AIO
    if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
        if (!strcmp(buf, "native")) {
            bdrv_flags |= BDRV_O_NATIVE_AIO;
        } else if (!strcmp(buf, "threads")) {
            /* this is the default */
        } else {
415
           error_setg(errp, "invalid aio option");
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           goto early_err;
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        }
    }
#endif

    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");
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            goto early_err;
427
        }
428

429
        drv = bdrv_find_format(buf);
430
        if (!drv) {
431
            error_setg(errp, "'%s' invalid format", buf);
432
            goto early_err;
433
        }
434 435
    }

436
    /* disk I/O throttling */
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    memset(&cfg, 0, sizeof(cfg));
    cfg.buckets[THROTTLE_BPS_TOTAL].avg =
439
        qemu_opt_get_number(opts, "throttling.bps-total", 0);
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    cfg.buckets[THROTTLE_BPS_READ].avg  =
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        qemu_opt_get_number(opts, "throttling.bps-read", 0);
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    cfg.buckets[THROTTLE_BPS_WRITE].avg =
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        qemu_opt_get_number(opts, "throttling.bps-write", 0);
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    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);
448
    cfg.buckets[THROTTLE_OPS_WRITE].avg =
449
        qemu_opt_get_number(opts, "throttling.iops-write", 0);
450

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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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464
    cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
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    if (!check_throttle_config(&cfg, &error)) {
467
        error_propagate(errp, error);
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        goto early_err;
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    }

471
    on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
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    if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
473
        on_write_error = parse_block_error_action(buf, 0, &error);
474
        if (error) {
475
            error_propagate(errp, error);
476
            goto early_err;
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        }
    }

480
    on_read_error = BLOCKDEV_ON_ERROR_REPORT;
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    if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
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        on_read_error = parse_block_error_action(buf, 1, &error);
483
        if (error) {
484
            error_propagate(errp, error);
485
            goto early_err;
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        }
    }

489
    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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    /* init */
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    blk = blk_new_with_bs(qemu_opts_id(opts), errp);
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    if (!blk) {
        goto early_err;
    }
512
    bs = blk_bs(blk);
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    bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
    bs->read_only = ro;
    bs->detect_zeroes = detect_zeroes;
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517
    bdrv_set_on_error(bs, on_read_error, on_write_error);
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519
    /* disk I/O throttling */
520
    if (throttle_enabled(&cfg)) {
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        bdrv_io_limits_enable(bs);
        bdrv_set_io_limits(bs, &cfg);
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    }
524

525
    if (!file || !*file) {
526
        if (has_driver_specific_opts) {
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            file = NULL;
        } else {
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            QDECREF(bs_opts);
            qemu_opts_del(opts);
531
            return blk;
532
        }
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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);
    }

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    if (copy_on_read) {
        bdrv_flags |= BDRV_O_COPY_ON_READ;
    }

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    if (runstate_check(RUN_STATE_INMIGRATE)) {
        bdrv_flags |= BDRV_O_INCOMING;
    }

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    bdrv_flags |= ro ? 0 : BDRV_O_RDWR;

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    QINCREF(bs_opts);
551
    ret = bdrv_open(&bs, file, NULL, bs_opts, bdrv_flags, drv, &error);
552
    assert(bs == blk_bs(blk));
553

554
    if (ret < 0) {
555
        error_setg(errp, "could not open disk image %s: %s",
556
                   file ?: blk_name(blk), error_get_pretty(error));
557
        error_free(error);
558
        goto err;
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    }

561
    if (bdrv_key_required(bs)) {
562
        autostart = 0;
563
    }
564

565
    QDECREF(bs_opts);
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    qemu_opts_del(opts);

568
    return blk;
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err:
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    blk_unref(blk);
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early_err:
    qemu_opts_del(opts);
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err_no_opts:
    QDECREF(bs_opts);
576
    return NULL;
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}

579 580
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) {
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        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;
        }
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    }

    /* rename all items in opts */
    while ((value = qemu_opt_get(opts, from))) {
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        qemu_opt_set(opts, to, value);
        qemu_opt_unset(opts, from);
    }
}

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

        /* 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",
663 664 665 666 667 668 669 670
        },{
            .name = "rerror",
            .type = QEMU_OPT_STRING,
            .help = "read error action",
        },{
            .name = "werror",
            .type = QEMU_OPT_STRING,
            .help = "write error action",
671 672 673 674 675 676
        },{
            .name = "copy-on-read",
            .type = QEMU_OPT_BOOL,
            .help = "copy read data from backing file into image file",
        },

677 678 679 680
        { /* end of list */ }
    },
};

681
DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type)
682
{
K
Kevin Wolf 已提交
683
    const char *value;
684
    BlockBackend *blk;
685
    DriveInfo *dinfo = NULL;
686
    QDict *bs_opts;
687 688
    QemuOpts *legacy_opts;
    DriveMediaType media = MEDIA_DISK;
689
    BlockInterfaceType type;
690
    int cyls, heads, secs, translation;
691
    int max_devs, bus_id, unit_id, index;
692
    const char *devaddr;
693
    const char *werror, *rerror;
F
Fam Zheng 已提交
694 695
    bool read_only = false;
    bool copy_on_read;
696
    const char *serial;
M
Max Reitz 已提交
697
    const char *filename;
698
    Error *local_err = NULL;
699
    int i;
K
Kevin Wolf 已提交
700

701
    /* Change legacy command line options into QMP ones */
702 703 704 705 706 707 708
    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" },
709

710 711 712
        { "bps",            "throttling.bps-total" },
        { "bps_rd",         "throttling.bps-read" },
        { "bps_wr",         "throttling.bps-write" },
713

714 715 716
        { "iops_max",       "throttling.iops-total-max" },
        { "iops_rd_max",    "throttling.iops-read-max" },
        { "iops_wr_max",    "throttling.iops-write-max" },
717

718 719 720
        { "bps_max",        "throttling.bps-total-max" },
        { "bps_rd_max",     "throttling.bps-read-max" },
        { "bps_wr_max",     "throttling.bps-write-max" },
721

722
        { "iops_size",      "throttling.iops-size" },
723

724 725 726 727
        { "readonly",       "read-only" },
    };

    for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
728 729 730 731 732 733 734
        qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to,
                        &local_err);
        if (local_err) {
            error_report("%s", error_get_pretty(local_err));
            error_free(local_err);
            return NULL;
        }
735
    }
736

K
Kevin Wolf 已提交
737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761
    value = qemu_opt_get(all_opts, "cache");
    if (value) {
        int flags = 0;

        if (bdrv_parse_cache_flags(value, &flags) != 0) {
            error_report("invalid cache option");
            return NULL;
        }

        /* Specific options take precedence */
        if (!qemu_opt_get(all_opts, "cache.writeback")) {
            qemu_opt_set_bool(all_opts, "cache.writeback",
                              !!(flags & BDRV_O_CACHE_WB));
        }
        if (!qemu_opt_get(all_opts, "cache.direct")) {
            qemu_opt_set_bool(all_opts, "cache.direct",
                              !!(flags & BDRV_O_NOCACHE));
        }
        if (!qemu_opt_get(all_opts, "cache.no-flush")) {
            qemu_opt_set_bool(all_opts, "cache.no-flush",
                              !!(flags & BDRV_O_NO_FLUSH));
        }
        qemu_opt_unset(all_opts, "cache");
    }

762 763 764 765
    /* Get a QDict for processing the options */
    bs_opts = qdict_new();
    qemu_opts_to_qdict(all_opts, bs_opts);

766 767
    legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
                                   &error_abort);
768
    qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
769
    if (local_err) {
770
        error_report("%s", error_get_pretty(local_err));
771 772 773 774
        error_free(local_err);
        goto fail;
    }

775 776 777 778 779 780 781
    /* 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");
    }

782 783 784 785 786 787 788
    /* 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
789
            read_only = true;
790 791 792 793 794 795
        } else {
            error_report("'%s' invalid media", value);
            goto fail;
        }
    }

796
    /* copy-on-read is disabled with a warning for read-only devices */
F
Fam Zheng 已提交
797
    read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false);
798 799 800 801 802 803 804 805 806 807 808 809
    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"));

810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
    /* 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;
    }

825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856
    /* 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;
857 858 859 860
        } else if (!strcmp(value, "large")) {
            translation = BIOS_ATA_TRANSLATION_LARGE;
        } else if (!strcmp(value, "rechs")) {
            translation = BIOS_ATA_TRANSLATION_RECHS;
861 862 863 864 865 866 867 868 869 870 871 872 873 874 875
        } 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;
        }
    }

876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914
    /* 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;
    }

915 916 917
    /* Serial number */
    serial = qemu_opt_get(legacy_opts, "serial");

918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935
    /* 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);
    }

936 937 938 939 940 941 942 943 944
    /* 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;
945 946
        devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
                                   &error_abort);
947 948 949 950 951 952 953 954 955 956 957
        if (arch_type == QEMU_ARCH_S390X) {
            qemu_opt_set(devopts, "driver", "virtio-blk-s390");
        } else {
            qemu_opt_set(devopts, "driver", "virtio-blk-pci");
        }
        qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"));
        if (devaddr) {
            qemu_opt_set(devopts, "addr", devaddr);
        }
    }

M
Max Reitz 已提交
958 959
    filename = qemu_opt_get(legacy_opts, "file");

960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
    /* 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));
    }

981
    /* Actual block device init: Functionality shared with blockdev-add */
982
    blk = blockdev_init(filename, bs_opts, &local_err);
983
    bs_opts = NULL;
984
    if (!blk) {
985
        if (local_err) {
986
            error_report("%s", error_get_pretty(local_err));
987 988
            error_free(local_err);
        }
989
        goto fail;
990
    } else {
991
        assert(!local_err);
992 993
    }

994 995
    /* Create legacy DriveInfo */
    dinfo = g_malloc0(sizeof(*dinfo));
996
    dinfo->opts = all_opts;
997

998 999 1000 1001 1002
    dinfo->cyls = cyls;
    dinfo->heads = heads;
    dinfo->secs = secs;
    dinfo->trans = translation;

1003
    dinfo->type = type;
1004 1005
    dinfo->bus = bus_id;
    dinfo->unit = unit_id;
1006
    dinfo->devaddr = devaddr;
1007 1008
    dinfo->serial = g_strdup(serial);

1009 1010
    blk_set_legacy_dinfo(blk, dinfo);

1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
    switch(type) {
    case IF_IDE:
    case IF_SCSI:
    case IF_XEN:
    case IF_NONE:
        dinfo->media_cd = media == MEDIA_CDROM;
        break;
    default:
        break;
    }

1022
fail:
1023
    qemu_opts_del(legacy_opts);
1024
    QDECREF(bs_opts);
1025
    return dinfo;
1026 1027
}

1028 1029 1030
void do_commit(Monitor *mon, const QDict *qdict)
{
    const char *device = qdict_get_str(qdict, "device");
1031
    BlockDriverState *bs;
1032
    int ret;
1033

1034
    if (!strcmp(device, "all")) {
1035
        ret = bdrv_commit_all();
1036 1037
    } else {
        bs = bdrv_find(device);
1038
        if (!bs) {
1039
            monitor_printf(mon, "Device '%s' not found\n", device);
1040
            return;
1041
        }
1042
        ret = bdrv_commit(bs);
1043 1044 1045 1046
    }
    if (ret < 0) {
        monitor_printf(mon, "'commit' error for '%s': %s\n", device,
                       strerror(-ret));
1047 1048 1049
    }
}

1050 1051
static void blockdev_do_action(int kind, void *data, Error **errp)
{
1052 1053
    TransactionAction action;
    TransactionActionList list;
1054 1055 1056 1057 1058 1059 1060 1061

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

1062 1063 1064 1065 1066
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,
1067
                                bool has_format, const char *format,
1068
                                bool has_mode, NewImageMode mode, Error **errp)
1069
{
1070
    BlockdevSnapshot snapshot = {
1071
        .has_device = has_device,
1072
        .device = (char *) device,
1073 1074
        .has_node_name = has_node_name,
        .node_name = (char *) node_name,
1075
        .snapshot_file = (char *) snapshot_file,
1076 1077
        .has_snapshot_node_name = has_snapshot_node_name,
        .snapshot_node_name = (char *) snapshot_node_name,
1078 1079 1080 1081 1082
        .has_format = has_format,
        .format = (char *) format,
        .has_mode = has_mode,
        .mode = mode,
    };
1083 1084
    blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
                       &snapshot, errp);
1085 1086
}

1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
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);
}

1100 1101 1102 1103 1104 1105 1106 1107
SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
                                                         bool has_id,
                                                         const char *id,
                                                         bool has_name,
                                                         const char *name,
                                                         Error **errp)
{
    BlockDriverState *bs = bdrv_find(device);
1108
    AioContext *aio_context;
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
    QEMUSnapshotInfo sn;
    Error *local_err = NULL;
    SnapshotInfo *info = NULL;
    int ret;

    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return NULL;
    }

    if (!has_id) {
        id = NULL;
    }

    if (!has_name) {
        name = NULL;
    }

    if (!id && !name) {
        error_setg(errp, "Name or id must be provided");
        return NULL;
    }

1132 1133 1134
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

1135 1136 1137 1138
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
        goto out_aio_context;
    }

1139
    ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1140
    if (local_err) {
1141
        error_propagate(errp, local_err);
1142
        goto out_aio_context;
1143 1144 1145 1146 1147 1148
    }
    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);
1149
        goto out_aio_context;
1150 1151 1152
    }

    bdrv_snapshot_delete(bs, id, name, &local_err);
1153
    if (local_err) {
1154
        error_propagate(errp, local_err);
1155
        goto out_aio_context;
1156 1157
    }

1158 1159
    aio_context_release(aio_context);

1160
    info = g_new0(SnapshotInfo, 1);
1161 1162 1163 1164 1165 1166 1167 1168 1169
    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;
1170 1171 1172 1173

out_aio_context:
    aio_context_release(aio_context);
    return NULL;
1174
}
1175

1176
/* New and old BlockDriverState structs for atomic group operations */
1177

1178
typedef struct BlkTransactionState BlkTransactionState;
1179 1180 1181 1182 1183 1184 1185

/* 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. */
1186
    void (*prepare)(BlkTransactionState *common, Error **errp);
1187
    /* Commit the changes, can be NULL. */
1188
    void (*commit)(BlkTransactionState *common);
1189
    /* Abort the changes on fail, can be NULL. */
1190
    void (*abort)(BlkTransactionState *common);
1191
    /* Clean up resource in the end, can be NULL. */
1192
    void (*clean)(BlkTransactionState *common);
1193 1194 1195 1196 1197 1198 1199
} 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().
 */
1200
struct BlkTransactionState {
1201
    TransactionAction *action;
1202
    const BdrvActionOps *ops;
1203
    QSIMPLEQ_ENTRY(BlkTransactionState) entry;
1204 1205
};

1206 1207 1208 1209
/* internal snapshot private data */
typedef struct InternalSnapshotState {
    BlkTransactionState common;
    BlockDriverState *bs;
1210
    AioContext *aio_context;
1211 1212 1213 1214 1215 1216
    QEMUSnapshotInfo sn;
} InternalSnapshotState;

static void internal_snapshot_prepare(BlkTransactionState *common,
                                      Error **errp)
{
1217
    Error *local_err = NULL;
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
    const char *device;
    const char *name;
    BlockDriverState *bs;
    QEMUSnapshotInfo old_sn, *sn;
    bool ret;
    qemu_timeval tv;
    BlockdevSnapshotInternal *internal;
    InternalSnapshotState *state;
    int ret1;

    g_assert(common->action->kind ==
             TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
    internal = common->action->blockdev_snapshot_internal_sync;
    state = DO_UPCAST(InternalSnapshotState, common, common);

    /* 1. parse input */
    device = internal->device;
    name = internal->name;

    /* 2. check for validation */
    bs = bdrv_find(device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
    }

1244 1245 1246 1247
    /* AioContext is released in .clean() */
    state->aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(state->aio_context);

1248 1249 1250 1251 1252
    if (!bdrv_is_inserted(bs)) {
        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
        return;
    }

1253 1254 1255 1256
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
        return;
    }

1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273
    if (bdrv_is_read_only(bs)) {
        error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
        return;
    }

    if (!bdrv_can_snapshot(bs)) {
        error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
                  bs->drv->format_name, device, "internal snapshot");
        return;
    }

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

    /* check whether a snapshot with name exist */
1274 1275 1276 1277
    ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
                                            &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328
        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);
    }
}

1329 1330 1331 1332 1333 1334 1335 1336 1337 1338
static void internal_snapshot_clean(BlkTransactionState *common)
{
    InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState,
                                             common, common);

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

1339
/* external snapshot private data */
1340 1341
typedef struct ExternalSnapshotState {
    BlkTransactionState common;
1342 1343
    BlockDriverState *old_bs;
    BlockDriverState *new_bs;
1344
    AioContext *aio_context;
1345
} ExternalSnapshotState;
1346

1347
static void external_snapshot_prepare(BlkTransactionState *common,
1348 1349 1350 1351
                                      Error **errp)
{
    BlockDriver *drv;
    int flags, ret;
1352
    QDict *options = NULL;
1353
    Error *local_err = NULL;
1354
    bool has_device = false;
1355
    const char *device;
1356 1357 1358 1359
    bool has_node_name = false;
    const char *node_name;
    bool has_snapshot_node_name = false;
    const char *snapshot_node_name;
1360 1361 1362
    const char *new_image_file;
    const char *format = "qcow2";
    enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1363 1364
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
1365
    TransactionAction *action = common->action;
1366

1367
    /* get parameters */
1368
    g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
1369

1370
    has_device = action->blockdev_snapshot_sync->has_device;
1371
    device = action->blockdev_snapshot_sync->device;
1372 1373 1374 1375 1376 1377
    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;

1378 1379 1380 1381 1382 1383 1384 1385 1386
    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 */
1387 1388 1389 1390 1391 1392
    drv = bdrv_find_format(format);
    if (!drv) {
        error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
        return;
    }

1393 1394 1395
    state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
                                   has_node_name ? node_name : NULL,
                                   &local_err);
1396
    if (local_err) {
1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
        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");
1408 1409 1410
        return;
    }

1411 1412 1413 1414
    /* 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);

1415
    if (!bdrv_is_inserted(state->old_bs)) {
1416 1417 1418 1419
        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
        return;
    }

1420 1421
    if (bdrv_op_is_blocked(state->old_bs,
                           BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1422 1423 1424
        return;
    }

1425 1426
    if (!bdrv_is_read_only(state->old_bs)) {
        if (bdrv_flush(state->old_bs)) {
1427 1428 1429 1430 1431
            error_set(errp, QERR_IO_ERROR);
            return;
        }
    }

1432
    if (!bdrv_is_first_non_filter(state->old_bs)) {
1433 1434 1435 1436
        error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
        return;
    }

1437
    flags = state->old_bs->open_flags;
1438 1439 1440 1441

    /* create new image w/backing file */
    if (mode != NEW_IMAGE_MODE_EXISTING) {
        bdrv_img_create(new_image_file, format,
1442 1443
                        state->old_bs->filename,
                        state->old_bs->drv->format_name,
1444
                        NULL, -1, flags, &local_err, false);
1445
        if (local_err) {
1446 1447 1448 1449 1450
            error_propagate(errp, local_err);
            return;
        }
    }

1451 1452 1453 1454 1455 1456
    if (has_snapshot_node_name) {
        options = qdict_new();
        qdict_put(options, "node-name",
                  qstring_from_str(snapshot_node_name));
    }

1457 1458
    /* TODO Inherit bs->options or only take explicit options with an
     * extended QMP command? */
1459
    assert(state->new_bs == NULL);
1460
    ret = bdrv_open(&state->new_bs, new_image_file, NULL, options,
1461
                    flags | BDRV_O_NO_BACKING, drv, &local_err);
1462
    /* We will manually add the backing_hd field to the bs later */
1463
    if (ret != 0) {
1464
        error_propagate(errp, local_err);
1465 1466 1467
    }
}

1468
static void external_snapshot_commit(BlkTransactionState *common)
1469
{
1470 1471
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
1472

1473 1474
    bdrv_set_aio_context(state->new_bs, state->aio_context);

1475 1476
    /* This removes our old bs and adds the new bs */
    bdrv_append(state->new_bs, state->old_bs);
1477 1478 1479
    /* 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 */
1480
    bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
1481
                NULL);
1482 1483

    aio_context_release(state->aio_context);
1484 1485
}

1486
static void external_snapshot_abort(BlkTransactionState *common)
1487
{
1488 1489 1490
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
    if (state->new_bs) {
F
Fam Zheng 已提交
1491
        bdrv_unref(state->new_bs);
1492
    }
1493 1494 1495
    if (state->aio_context) {
        aio_context_release(state->aio_context);
    }
1496 1497
}

1498 1499 1500
typedef struct DriveBackupState {
    BlkTransactionState common;
    BlockDriverState *bs;
1501
    AioContext *aio_context;
1502 1503 1504 1505 1506 1507
    BlockJob *job;
} DriveBackupState;

static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
1508
    BlockDriverState *bs;
1509 1510 1511 1512 1513 1514
    DriveBackup *backup;
    Error *local_err = NULL;

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

1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
    bs = bdrv_find(backup->device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device);
        return;
    }

    /* AioContext is released in .clean() */
    state->aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(state->aio_context);

1525 1526
    qmp_drive_backup(backup->device, backup->target,
                     backup->has_format, backup->format,
1527
                     backup->sync,
1528 1529 1530 1531 1532
                     backup->has_mode, backup->mode,
                     backup->has_speed, backup->speed,
                     backup->has_on_source_error, backup->on_source_error,
                     backup->has_on_target_error, backup->on_target_error,
                     &local_err);
1533
    if (local_err) {
1534 1535 1536 1537
        error_propagate(errp, local_err);
        return;
    }

1538
    state->bs = bs;
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
    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);
    }
}

1553 1554 1555 1556 1557 1558 1559 1560 1561
static void drive_backup_clean(BlkTransactionState *common)
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);

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

1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634
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;
    BlockDriverState *bs, *target;
    Error *local_err = NULL;

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

    bs = bdrv_find(backup->device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device);
        return;
    }

    target = bdrv_find(backup->target);
    if (!target) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, backup->target);
        return;
    }

    /* AioContext is released in .clean() */
    state->aio_context = bdrv_get_aio_context(bs);
    if (state->aio_context != bdrv_get_aio_context(target)) {
        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;
    }

    state->bs = bs;
    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);
    }
}

1635 1636 1637 1638 1639 1640 1641
static void abort_prepare(BlkTransactionState *common, Error **errp)
{
    error_setg(errp, "Transaction aborted using Abort action");
}

static void abort_commit(BlkTransactionState *common)
{
1642
    g_assert_not_reached(); /* this action never succeeds */
1643 1644
}

1645
static const BdrvActionOps actions[] = {
1646
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1647
        .instance_size = sizeof(ExternalSnapshotState),
1648 1649 1650 1651
        .prepare  = external_snapshot_prepare,
        .commit   = external_snapshot_commit,
        .abort = external_snapshot_abort,
    },
1652 1653 1654 1655
    [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
        .instance_size = sizeof(DriveBackupState),
        .prepare = drive_backup_prepare,
        .abort = drive_backup_abort,
1656
        .clean = drive_backup_clean,
1657
    },
1658 1659 1660 1661 1662 1663
    [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = {
        .instance_size = sizeof(BlockdevBackupState),
        .prepare = blockdev_backup_prepare,
        .abort = blockdev_backup_abort,
        .clean = blockdev_backup_clean,
    },
1664 1665 1666 1667 1668
    [TRANSACTION_ACTION_KIND_ABORT] = {
        .instance_size = sizeof(BlkTransactionState),
        .prepare = abort_prepare,
        .commit = abort_commit,
    },
1669 1670 1671 1672
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = {
        .instance_size = sizeof(InternalSnapshotState),
        .prepare  = internal_snapshot_prepare,
        .abort = internal_snapshot_abort,
1673
        .clean = internal_snapshot_clean,
1674
    },
1675 1676
};

1677
/*
1678 1679
 * 'Atomic' group operations.  The operations are performed as a set, and if
 * any fail then we roll back all operations in the group.
1680
 */
1681
void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1682
{
1683
    TransactionActionList *dev_entry = dev_list;
1684
    BlkTransactionState *state, *next;
1685
    Error *local_err = NULL;
1686

1687
    QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1688 1689
    QSIMPLEQ_INIT(&snap_bdrv_states);

1690
    /* drain all i/o before any operations */
1691 1692
    bdrv_drain_all();

1693
    /* We don't do anything in this loop that commits us to the operations */
1694
    while (NULL != dev_entry) {
1695
        TransactionAction *dev_info = NULL;
1696
        const BdrvActionOps *ops;
1697

1698 1699 1700
        dev_info = dev_entry->value;
        dev_entry = dev_entry->next;

1701 1702 1703
        assert(dev_info->kind < ARRAY_SIZE(actions));

        ops = &actions[dev_info->kind];
1704 1705
        assert(ops->instance_size > 0);

1706 1707 1708 1709
        state = g_malloc0(ops->instance_size);
        state->ops = ops;
        state->action = dev_info;
        QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1710

1711
        state->ops->prepare(state, &local_err);
1712
        if (local_err) {
1713 1714
            error_propagate(errp, local_err);
            goto delete_and_fail;
1715 1716 1717
        }
    }

1718
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1719 1720 1721
        if (state->ops->commit) {
            state->ops->commit(state);
        }
1722 1723 1724 1725 1726 1727
    }

    /* success */
    goto exit;

delete_and_fail:
1728
    /* failure, and it is all-or-none; roll back all operations */
1729 1730 1731
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
        if (state->ops->abort) {
            state->ops->abort(state);
1732
        }
1733 1734
    }
exit:
1735 1736 1737
    QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
        if (state->ops->clean) {
            state->ops->clean(state);
1738
        }
1739
        g_free(state);
1740 1741 1742 1743
    }
}


1744
static void eject_device(BlockBackend *blk, int force, Error **errp)
1745
{
1746
    BlockDriverState *bs = blk_bs(blk);
1747 1748 1749 1750
    AioContext *aio_context;

    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);
1751

1752
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) {
1753
        goto out;
1754
    }
1755
    if (!blk_dev_has_removable_media(blk)) {
1756 1757
        error_setg(errp, "Device '%s' is not removable",
                   bdrv_get_device_name(bs));
1758
        goto out;
1759
    }
1760

1761 1762
    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
1763
        if (!force) {
1764 1765
            error_setg(errp, "Device '%s' is locked",
                       bdrv_get_device_name(bs));
1766
            goto out;
P
Paolo Bonzini 已提交
1767
        }
1768
    }
1769

1770
    bdrv_close(bs);
1771 1772 1773

out:
    aio_context_release(aio_context);
1774 1775
}

L
Luiz Capitulino 已提交
1776
void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1777
{
1778
    BlockBackend *blk;
1779

1780 1781
    blk = blk_by_name(device);
    if (!blk) {
L
Luiz Capitulino 已提交
1782 1783
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1784 1785
    }

1786
    eject_device(blk, force, errp);
1787 1788
}

1789 1790 1791
void qmp_block_passwd(bool has_device, const char *device,
                      bool has_node_name, const char *node_name,
                      const char *password, Error **errp)
1792
{
1793
    Error *local_err = NULL;
1794
    BlockDriverState *bs;
1795
    AioContext *aio_context;
1796 1797
    int err;

1798 1799 1800
    bs = bdrv_lookup_bs(has_device ? device : NULL,
                        has_node_name ? node_name : NULL,
                        &local_err);
1801
    if (local_err) {
1802
        error_propagate(errp, local_err);
L
Luiz Capitulino 已提交
1803
        return;
1804 1805
    }

1806 1807 1808
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

L
Luiz Capitulino 已提交
1809
    err = bdrv_set_key(bs, password);
1810
    if (err == -EINVAL) {
L
Luiz Capitulino 已提交
1811
        error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
1812
        goto out;
1813
    } else if (err < 0) {
L
Luiz Capitulino 已提交
1814
        error_set(errp, QERR_INVALID_PASSWORD);
1815
        goto out;
1816
    }
1817 1818 1819

out:
    aio_context_release(aio_context);
1820 1821
}

1822
/* Assumes AioContext is held */
L
Luiz Capitulino 已提交
1823 1824 1825 1826
static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
                                    int bdrv_flags, BlockDriver *drv,
                                    const char *password, Error **errp)
{
1827
    Error *local_err = NULL;
1828 1829
    int ret;

1830
    ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err);
1831
    if (ret < 0) {
1832
        error_propagate(errp, local_err);
L
Luiz Capitulino 已提交
1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850
        return;
    }

    if (bdrv_key_required(bs)) {
        if (password) {
            if (bdrv_set_key(bs, password) < 0) {
                error_set(errp, QERR_INVALID_PASSWORD);
            }
        } else {
            error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
                      bdrv_get_encrypted_filename(bs));
        }
    } else if (password) {
        error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
    }
}

void qmp_change_blockdev(const char *device, const char *filename,
1851
                         const char *format, Error **errp)
1852
{
1853
    BlockBackend *blk;
1854
    BlockDriverState *bs;
1855
    AioContext *aio_context;
1856 1857
    BlockDriver *drv = NULL;
    int bdrv_flags;
1858
    Error *err = NULL;
1859

1860 1861
    blk = blk_by_name(device);
    if (!blk) {
L
Luiz Capitulino 已提交
1862 1863
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1864
    }
1865
    bs = blk_bs(blk);
L
Luiz Capitulino 已提交
1866

1867 1868 1869
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

L
Luiz Capitulino 已提交
1870
    if (format) {
1871
        drv = bdrv_find_whitelisted_format(format, bs->read_only);
1872
        if (!drv) {
L
Luiz Capitulino 已提交
1873
            error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
1874
            goto out;
1875 1876
        }
    }
L
Luiz Capitulino 已提交
1877

1878
    eject_device(blk, 0, &err);
1879
    if (err) {
L
Luiz Capitulino 已提交
1880
        error_propagate(errp, err);
1881
        goto out;
1882
    }
L
Luiz Capitulino 已提交
1883

1884
    bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1885
    bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
L
Luiz Capitulino 已提交
1886 1887

    qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1888 1889 1890

out:
    aio_context_release(aio_context);
1891
}
1892

Z
Zhi Yong Wu 已提交
1893
/* throttling disk I/O limits */
1894
void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909
                               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,
1910 1911 1912
                               int64_t iops_wr_max,
                               bool has_iops_size,
                               int64_t iops_size, Error **errp)
Z
Zhi Yong Wu 已提交
1913
{
1914
    ThrottleConfig cfg;
Z
Zhi Yong Wu 已提交
1915
    BlockDriverState *bs;
1916
    AioContext *aio_context;
Z
Zhi Yong Wu 已提交
1917

1918
    bs = bdrv_find(device);
Z
Zhi Yong Wu 已提交
1919
    if (!bs) {
1920 1921
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
Z
Zhi Yong Wu 已提交
1922 1923
    }

1924 1925 1926 1927 1928 1929 1930 1931 1932
    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;

1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950
    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
1951

1952 1953 1954
    if (has_iops_size) {
        cfg.op_size = iops_size;
    }
1955 1956

    if (!check_throttle_config(&cfg, errp)) {
1957
        return;
Z
Zhi Yong Wu 已提交
1958 1959
    }

1960 1961 1962
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

1963
    if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
Z
Zhi Yong Wu 已提交
1964
        bdrv_io_limits_enable(bs);
1965
    } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
Z
Zhi Yong Wu 已提交
1966
        bdrv_io_limits_disable(bs);
1967 1968 1969 1970
    }

    if (bs->io_limits_enabled) {
        bdrv_set_io_limits(bs, &cfg);
Z
Zhi Yong Wu 已提交
1971
    }
1972 1973

    aio_context_release(aio_context);
Z
Zhi Yong Wu 已提交
1974 1975
}

1976 1977 1978
int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
    const char *id = qdict_get_str(qdict, "id");
1979
    BlockBackend *blk;
1980
    BlockDriverState *bs;
1981
    AioContext *aio_context;
1982
    Error *local_err = NULL;
1983

1984 1985
    blk = blk_by_name(id);
    if (!blk) {
1986
        error_report("Device '%s' not found", id);
1987 1988
        return -1;
    }
1989
    bs = blk_bs(blk);
1990

1991
    if (!blk_legacy_dinfo(blk)) {
1992 1993 1994 1995 1996
        error_report("Deleting device added with blockdev-add"
                     " is not supported");
        return -1;
    }

1997 1998 1999
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

2000 2001 2002
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
        error_report("%s", error_get_pretty(local_err));
        error_free(local_err);
2003
        aio_context_release(aio_context);
M
Marcelo Tosatti 已提交
2004 2005
        return -1;
    }
2006 2007

    /* quiesce block driver; prevent further io */
2008
    bdrv_drain_all();
2009 2010 2011
    bdrv_flush(bs);
    bdrv_close(bs);

2012
    /* if we have a device attached to this BlockDriverState
2013 2014 2015 2016
     * 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.
     */
2017
    if (blk_get_attached_dev(blk)) {
2018
        blk_hide_on_behalf_of_do_drive_del(blk);
2019 2020 2021
        /* Further I/O must not pause the guest */
        bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
                          BLOCKDEV_ON_ERROR_REPORT);
2022
    } else {
2023
        blk_unref(blk);
2024 2025
    }

2026
    aio_context_release(aio_context);
2027 2028
    return 0;
}
2029

2030 2031 2032
void qmp_block_resize(bool has_device, const char *device,
                      bool has_node_name, const char *node_name,
                      int64_t size, Error **errp)
2033
{
2034
    Error *local_err = NULL;
2035
    BlockDriverState *bs;
2036
    AioContext *aio_context;
2037
    int ret;
2038

2039 2040 2041
    bs = bdrv_lookup_bs(has_device ? device : NULL,
                        has_node_name ? node_name : NULL,
                        &local_err);
2042
    if (local_err) {
2043 2044 2045 2046
        error_propagate(errp, local_err);
        return;
    }

2047 2048 2049
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

2050 2051
    if (!bdrv_is_first_non_filter(bs)) {
        error_set(errp, QERR_FEATURE_DISABLED, "resize");
2052
        goto out;
2053 2054 2055
    }

    if (size < 0) {
2056
        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2057
        goto out;
2058 2059
    }

2060 2061
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
        error_set(errp, QERR_DEVICE_IN_USE, device);
2062
        goto out;
2063 2064
    }

2065 2066 2067
    /* complete all in-flight operations before resizing the device */
    bdrv_drain_all();

2068 2069
    ret = bdrv_truncate(bs, size);
    switch (ret) {
2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084
    case 0:
        break;
    case -ENOMEDIUM:
        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
        break;
    case -ENOTSUP:
        error_set(errp, QERR_UNSUPPORTED);
        break;
    case -EACCES:
        error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
        break;
    case -EBUSY:
        error_set(errp, QERR_DEVICE_IN_USE, device);
        break;
    default:
2085
        error_setg_errno(errp, -ret, "Could not resize");
2086
        break;
2087
    }
2088 2089 2090

out:
    aio_context_release(aio_context);
2091
}
S
Stefan Hajnoczi 已提交
2092

2093
static void block_job_cb(void *opaque, int ret)
S
Stefan Hajnoczi 已提交
2094
{
2095 2096 2097 2098 2099
    /* 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
2100
    BlockDriverState *bs = opaque;
2101
    const char *msg = NULL;
S
Stefan Hajnoczi 已提交
2102

2103
    trace_block_job_cb(bs, bs->job, ret);
S
Stefan Hajnoczi 已提交
2104 2105

    assert(bs->job);
2106

S
Stefan Hajnoczi 已提交
2107
    if (ret < 0) {
2108
        msg = strerror(-ret);
S
Stefan Hajnoczi 已提交
2109 2110
    }

2111
    if (block_job_is_cancelled(bs->job)) {
2112
        block_job_event_cancelled(bs->job);
2113
    } else {
2114
        block_job_event_completed(bs->job, msg);
2115
    }
2116

F
Fam Zheng 已提交
2117
    bdrv_put_ref_bh_schedule(bs);
S
Stefan Hajnoczi 已提交
2118 2119
}

2120 2121 2122 2123
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
2124 2125
                      bool has_on_error, BlockdevOnError on_error,
                      Error **errp)
S
Stefan Hajnoczi 已提交
2126 2127
{
    BlockDriverState *bs;
2128
    BlockDriverState *base_bs = NULL;
2129
    AioContext *aio_context;
2130
    Error *local_err = NULL;
2131
    const char *base_name = NULL;
S
Stefan Hajnoczi 已提交
2132

P
Paolo Bonzini 已提交
2133 2134 2135 2136
    if (!has_on_error) {
        on_error = BLOCKDEV_ON_ERROR_REPORT;
    }

S
Stefan Hajnoczi 已提交
2137 2138 2139 2140 2141 2142
    bs = bdrv_find(device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
    }

2143 2144 2145
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

2146
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) {
2147
        goto out;
2148 2149
    }

2150
    if (has_base) {
2151 2152 2153
        base_bs = bdrv_find_backing_image(bs, base);
        if (base_bs == NULL) {
            error_set(errp, QERR_BASE_NOT_FOUND, base);
2154
            goto out;
2155
        }
2156
        assert(bdrv_get_aio_context(base_bs) == aio_context);
2157
        base_name = base;
S
Stefan Hajnoczi 已提交
2158 2159
    }

2160 2161 2162 2163 2164
    /* 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");
2165
        goto out;
2166 2167 2168 2169 2170 2171
    }

    /* 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
2172
                 on_error, block_job_cb, bs, &local_err);
2173
    if (local_err) {
2174
        error_propagate(errp, local_err);
2175
        goto out;
S
Stefan Hajnoczi 已提交
2176 2177 2178
    }

    trace_qmp_block_stream(bs, bs->job);
2179 2180 2181

out:
    aio_context_release(aio_context);
S
Stefan Hajnoczi 已提交
2182
}
2183

2184
void qmp_block_commit(const char *device,
2185 2186
                      bool has_base, const char *base,
                      bool has_top, const char *top,
2187
                      bool has_backing_file, const char *backing_file,
2188 2189 2190 2191 2192
                      bool has_speed, int64_t speed,
                      Error **errp)
{
    BlockDriverState *bs;
    BlockDriverState *base_bs, *top_bs;
2193
    AioContext *aio_context;
2194 2195 2196 2197
    Error *local_err = NULL;
    /* This will be part of the QMP command, if/when the
     * BlockdevOnError change for blkmirror makes it in
     */
2198
    BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
2199

2200 2201 2202 2203
    if (!has_speed) {
        speed = 0;
    }

2204 2205 2206 2207 2208
    /* 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. */
2209 2210 2211 2212
    bs = bdrv_find(device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
2213 2214
    }

2215 2216 2217 2218 2219 2220
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

    /* drain all i/o before commits */
    bdrv_drain_all();

2221
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2222
        goto out;
2223 2224 2225 2226 2227
    }

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

2228
    if (has_top && top) {
2229 2230 2231 2232 2233 2234 2235
        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");
2236
        goto out;
2237 2238
    }

2239 2240
    assert(bdrv_get_aio_context(top_bs) == aio_context);

2241 2242 2243 2244 2245 2246 2247 2248
    if (has_base && base) {
        base_bs = bdrv_find_backing_image(top_bs, base);
    } else {
        base_bs = bdrv_find_base(top_bs);
    }

    if (base_bs == NULL) {
        error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL");
2249
        goto out;
2250 2251
    }

2252 2253
    assert(bdrv_get_aio_context(base_bs) == aio_context);

2254 2255 2256 2257
    if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
        goto out;
    }

2258 2259 2260
    /* Do not allow attempts to commit an image into itself */
    if (top_bs == base_bs) {
        error_setg(errp, "cannot commit an image into itself");
2261
        goto out;
2262 2263
    }

F
Fam Zheng 已提交
2264
    if (top_bs == bs) {
2265 2266 2267
        if (has_backing_file) {
            error_setg(errp, "'backing-file' specified,"
                             " but 'top' is the active layer");
2268
            goto out;
2269
        }
F
Fam Zheng 已提交
2270 2271 2272 2273
        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,
2274
                     has_backing_file ? backing_file : NULL, &local_err);
F
Fam Zheng 已提交
2275
    }
2276 2277
    if (local_err != NULL) {
        error_propagate(errp, local_err);
2278
        goto out;
2279
    }
2280 2281 2282

out:
    aio_context_release(aio_context);
2283 2284
}

2285 2286
void qmp_drive_backup(const char *device, const char *target,
                      bool has_format, const char *format,
2287
                      enum MirrorSyncMode sync,
2288 2289 2290 2291 2292 2293 2294 2295
                      bool has_mode, enum NewImageMode mode,
                      bool has_speed, int64_t speed,
                      bool has_on_source_error, BlockdevOnError on_source_error,
                      bool has_on_target_error, BlockdevOnError on_target_error,
                      Error **errp)
{
    BlockDriverState *bs;
    BlockDriverState *target_bs;
2296
    BlockDriverState *source = NULL;
2297
    AioContext *aio_context;
2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322
    BlockDriver *drv = NULL;
    Error *local_err = NULL;
    int flags;
    int64_t size;
    int ret;

    if (!has_speed) {
        speed = 0;
    }
    if (!has_on_source_error) {
        on_source_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_on_target_error) {
        on_target_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_mode) {
        mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
    }

    bs = bdrv_find(device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
    }

2323 2324 2325
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

F
Fam Zheng 已提交
2326 2327
    /* Although backup_run has this check too, we need to use bs->drv below, so
     * do an early check redundantly. */
2328 2329
    if (!bdrv_is_inserted(bs)) {
        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2330
        goto out;
2331 2332 2333 2334 2335 2336 2337 2338 2339
    }

    if (!has_format) {
        format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
    }
    if (format) {
        drv = bdrv_find_format(format);
        if (!drv) {
            error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2340
            goto out;
2341 2342 2343
        }
    }

F
Fam Zheng 已提交
2344
    /* Early check to avoid creating target */
2345
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
2346
        goto out;
2347 2348 2349 2350
    }

    flags = bs->open_flags | BDRV_O_RDWR;

2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362
    /* See if we have a backing HD we can use to create our new image
     * on top of. */
    if (sync == MIRROR_SYNC_MODE_TOP) {
        source = bs->backing_hd;
        if (!source) {
            sync = MIRROR_SYNC_MODE_FULL;
        }
    }
    if (sync == MIRROR_SYNC_MODE_NONE) {
        source = bs;
    }

2363 2364 2365
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
2366
        goto out;
2367 2368 2369 2370
    }

    if (mode != NEW_IMAGE_MODE_EXISTING) {
        assert(format && drv);
2371 2372 2373 2374 2375 2376 2377 2378
        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);
        }
2379 2380
    }

2381
    if (local_err) {
2382
        error_propagate(errp, local_err);
2383
        goto out;
2384 2385
    }

2386
    target_bs = NULL;
2387
    ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
2388
    if (ret < 0) {
2389
        error_propagate(errp, local_err);
2390
        goto out;
2391 2392
    }

2393 2394
    bdrv_set_aio_context(target_bs, aio_context);

2395
    backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
2396 2397
                 block_job_cb, bs, &local_err);
    if (local_err != NULL) {
F
Fam Zheng 已提交
2398
        bdrv_unref(target_bs);
2399
        error_propagate(errp, local_err);
2400
        goto out;
2401
    }
2402 2403 2404

out:
    aio_context_release(aio_context);
2405 2406
}

2407 2408 2409 2410 2411
BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
{
    return bdrv_named_nodes_list();
}

F
Fam Zheng 已提交
2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462
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)
{
    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;
    }

    bs = bdrv_find(device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
    }

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

    target_bs = bdrv_find(target);
    if (!target_bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, target);
        goto out;
    }

    bdrv_ref(target_bs);
    bdrv_set_aio_context(target_bs, aio_context);
    backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
                 block_job_cb, bs, &local_err);
    if (local_err != NULL) {
        bdrv_unref(target_bs);
        error_propagate(errp, local_err);
    }
out:
    aio_context_release(aio_context);
}

2463 2464
#define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)

P
Paolo Bonzini 已提交
2465 2466
void qmp_drive_mirror(const char *device, const char *target,
                      bool has_format, const char *format,
2467
                      bool has_node_name, const char *node_name,
2468
                      bool has_replaces, const char *replaces,
P
Paolo Bonzini 已提交
2469 2470
                      enum MirrorSyncMode sync,
                      bool has_mode, enum NewImageMode mode,
2471
                      bool has_speed, int64_t speed,
2472
                      bool has_granularity, uint32_t granularity,
2473
                      bool has_buf_size, int64_t buf_size,
2474 2475 2476
                      bool has_on_source_error, BlockdevOnError on_source_error,
                      bool has_on_target_error, BlockdevOnError on_target_error,
                      Error **errp)
P
Paolo Bonzini 已提交
2477 2478 2479
{
    BlockDriverState *bs;
    BlockDriverState *source, *target_bs;
2480
    AioContext *aio_context;
P
Paolo Bonzini 已提交
2481 2482
    BlockDriver *drv = NULL;
    Error *local_err = NULL;
2483
    QDict *options = NULL;
P
Paolo Bonzini 已提交
2484
    int flags;
2485
    int64_t size;
P
Paolo Bonzini 已提交
2486 2487 2488 2489 2490
    int ret;

    if (!has_speed) {
        speed = 0;
    }
2491 2492 2493 2494 2495 2496
    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
2497 2498 2499
    if (!has_mode) {
        mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
    }
2500 2501 2502
    if (!has_granularity) {
        granularity = 0;
    }
2503 2504 2505 2506
    if (!has_buf_size) {
        buf_size = DEFAULT_MIRROR_BUF_SIZE;
    }

2507
    if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2508 2509
        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
                  "a value in range [512B, 64MB]");
2510 2511 2512
        return;
    }
    if (granularity & (granularity - 1)) {
2513
        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2");
2514 2515
        return;
    }
P
Paolo Bonzini 已提交
2516 2517 2518 2519 2520 2521 2522

    bs = bdrv_find(device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
    }

2523 2524 2525
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

P
Paolo Bonzini 已提交
2526 2527
    if (!bdrv_is_inserted(bs)) {
        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
2528
        goto out;
P
Paolo Bonzini 已提交
2529 2530 2531 2532 2533 2534 2535 2536 2537
    }

    if (!has_format) {
        format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
    }
    if (format) {
        drv = bdrv_find_format(format);
        if (!drv) {
            error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
2538
            goto out;
P
Paolo Bonzini 已提交
2539 2540 2541
        }
    }

2542
    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) {
2543
        goto out;
P
Paolo Bonzini 已提交
2544 2545 2546 2547 2548 2549 2550
    }

    flags = bs->open_flags | BDRV_O_RDWR;
    source = bs->backing_hd;
    if (!source && sync == MIRROR_SYNC_MODE_TOP) {
        sync = MIRROR_SYNC_MODE_FULL;
    }
2551 2552 2553
    if (sync == MIRROR_SYNC_MODE_NONE) {
        source = bs;
    }
P
Paolo Bonzini 已提交
2554

2555 2556 2557
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
2558
        goto out;
2559 2560
    }

2561 2562
    if (has_replaces) {
        BlockDriverState *to_replace_bs;
2563 2564
        AioContext *replace_aio_context;
        int64_t replace_size;
2565 2566 2567 2568

        if (!has_node_name) {
            error_setg(errp, "a node-name must be provided when replacing a"
                             " named node of the graph");
2569
            goto out;
2570 2571 2572 2573 2574 2575
        }

        to_replace_bs = check_to_replace_node(replaces, &local_err);

        if (!to_replace_bs) {
            error_propagate(errp, local_err);
2576
            goto out;
2577 2578
        }

2579 2580 2581 2582 2583 2584
        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) {
2585 2586
            error_setg(errp, "cannot replace image with a mirror image of "
                             "different size");
2587
            goto out;
2588 2589 2590
        }
    }

2591 2592 2593
    if ((sync == MIRROR_SYNC_MODE_FULL || !source)
        && mode != NEW_IMAGE_MODE_EXISTING)
    {
P
Paolo Bonzini 已提交
2594 2595
        /* create new image w/o backing file */
        assert(format && drv);
2596
        bdrv_img_create(target, format,
2597
                        NULL, NULL, NULL, size, flags, &local_err, false);
P
Paolo Bonzini 已提交
2598 2599 2600 2601 2602 2603
    } else {
        switch (mode) {
        case NEW_IMAGE_MODE_EXISTING:
            break;
        case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
            /* create new image with backing file */
2604 2605 2606
            bdrv_img_create(target, format,
                            source->filename,
                            source->drv->format_name,
2607
                            NULL, size, flags, &local_err, false);
P
Paolo Bonzini 已提交
2608 2609 2610 2611 2612 2613
            break;
        default:
            abort();
        }
    }

2614
    if (local_err) {
2615
        error_propagate(errp, local_err);
2616
        goto out;
P
Paolo Bonzini 已提交
2617 2618
    }

2619 2620 2621 2622 2623
    if (has_node_name) {
        options = qdict_new();
        qdict_put(options, "node-name", qstring_from_str(node_name));
    }

2624 2625 2626
    /* Mirroring takes care of copy-on-write using the source's backing
     * file.
     */
2627
    target_bs = NULL;
2628 2629
    ret = bdrv_open(&target_bs, target, NULL, options,
                    flags | BDRV_O_NO_BACKING, drv, &local_err);
P
Paolo Bonzini 已提交
2630
    if (ret < 0) {
2631
        error_propagate(errp, local_err);
2632
        goto out;
P
Paolo Bonzini 已提交
2633 2634
    }

2635 2636
    bdrv_set_aio_context(target_bs, aio_context);

2637 2638 2639 2640 2641 2642
    /* 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,
2643
                 on_source_error, on_target_error,
2644
                 block_job_cb, bs, &local_err);
P
Paolo Bonzini 已提交
2645
    if (local_err != NULL) {
F
Fam Zheng 已提交
2646
        bdrv_unref(target_bs);
P
Paolo Bonzini 已提交
2647
        error_propagate(errp, local_err);
2648
        goto out;
P
Paolo Bonzini 已提交
2649
    }
2650 2651 2652

out:
    aio_context_release(aio_context);
P
Paolo Bonzini 已提交
2653 2654
}

2655 2656
/* Get the block job for a given device name and acquire its AioContext */
static BlockJob *find_block_job(const char *device, AioContext **aio_context)
2657 2658 2659 2660
{
    BlockDriverState *bs;

    bs = bdrv_find(device);
2661 2662 2663 2664 2665 2666 2667 2668 2669 2670
    if (!bs) {
        goto notfound;
    }

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

    if (!bs->job) {
        aio_context_release(*aio_context);
        goto notfound;
2671
    }
2672

2673
    return bs->job;
2674 2675 2676 2677

notfound:
    *aio_context = NULL;
    return NULL;
2678 2679
}

2680
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
2681
{
2682 2683
    AioContext *aio_context;
    BlockJob *job = find_block_job(device, &aio_context);
2684 2685

    if (!job) {
2686
        error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2687 2688 2689
        return;
    }

2690
    block_job_set_speed(job, speed, errp);
2691
    aio_context_release(aio_context);
2692
}
2693

2694 2695
void qmp_block_job_cancel(const char *device,
                          bool has_force, bool force, Error **errp)
2696
{
2697 2698
    AioContext *aio_context;
    BlockJob *job = find_block_job(device, &aio_context);
2699

2700
    if (!job) {
2701
        error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
2702 2703
        return;
    }
2704 2705 2706 2707 2708

    if (!has_force) {
        force = false;
    }

2709
    if (job->paused && !force) {
2710 2711
        error_setg(errp, "The block job for device '%s' is currently paused",
                   device);
2712
        goto out;
2713
    }
2714 2715 2716

    trace_qmp_block_job_cancel(job);
    block_job_cancel(job);
2717 2718
out:
    aio_context_release(aio_context);
2719
}
S
Stefan Hajnoczi 已提交
2720

2721 2722
void qmp_block_job_pause(const char *device, Error **errp)
{
2723 2724
    AioContext *aio_context;
    BlockJob *job = find_block_job(device, &aio_context);
2725 2726 2727 2728 2729 2730 2731 2732

    if (!job) {
        error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
        return;
    }

    trace_qmp_block_job_pause(job);
    block_job_pause(job);
2733
    aio_context_release(aio_context);
2734 2735 2736 2737
}

void qmp_block_job_resume(const char *device, Error **errp)
{
2738 2739
    AioContext *aio_context;
    BlockJob *job = find_block_job(device, &aio_context);
2740 2741 2742 2743 2744 2745 2746 2747

    if (!job) {
        error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
        return;
    }

    trace_qmp_block_job_resume(job);
    block_job_resume(job);
2748
    aio_context_release(aio_context);
2749 2750
}

P
Paolo Bonzini 已提交
2751 2752
void qmp_block_job_complete(const char *device, Error **errp)
{
2753 2754
    AioContext *aio_context;
    BlockJob *job = find_block_job(device, &aio_context);
P
Paolo Bonzini 已提交
2755 2756 2757 2758 2759 2760 2761 2762

    if (!job) {
        error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
        return;
    }

    trace_qmp_block_job_complete(job);
    block_job_complete(job, errp);
2763
    aio_context_release(aio_context);
P
Paolo Bonzini 已提交
2764 2765
}

2766 2767 2768 2769 2770 2771
void qmp_change_backing_file(const char *device,
                             const char *image_node_name,
                             const char *backing_file,
                             Error **errp)
{
    BlockDriverState *bs = NULL;
2772
    AioContext *aio_context;
2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785
    BlockDriverState *image_bs = NULL;
    Error *local_err = NULL;
    bool ro;
    int open_flags;
    int ret;

    /* find the top layer BDS of the chain */
    bs = bdrv_find(device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
    }

2786 2787 2788
    aio_context = bdrv_get_aio_context(bs);
    aio_context_acquire(aio_context);

2789 2790 2791
    image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
2792
        goto out;
2793 2794 2795 2796
    }

    if (!image_bs) {
        error_setg(errp, "image file not found");
2797
        goto out;
2798 2799 2800 2801 2802
    }

    if (bdrv_find_base(image_bs) == image_bs) {
        error_setg(errp, "not allowing backing file change on an image "
                         "without a backing file");
2803
        goto out;
2804 2805 2806 2807 2808
    }

    /* 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)) {
2809
        goto out;
2810 2811 2812 2813 2814 2815
    }

    /* final sanity check */
    if (!bdrv_chain_contains(bs, image_bs)) {
        error_setg(errp, "'%s' and image file are not in the same chain",
                   device);
2816
        goto out;
2817 2818 2819 2820 2821 2822 2823 2824 2825 2826
    }

    /* 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);
2827
            goto out;
2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846
        }
    }

    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 */
        }
    }
2847 2848 2849

out:
    aio_context_release(aio_context);
2850 2851
}

K
Kevin Wolf 已提交
2852 2853 2854
void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
{
    QmpOutputVisitor *ov = qmp_output_visitor_new();
2855
    BlockBackend *blk;
K
Kevin Wolf 已提交
2856 2857 2858 2859 2860 2861 2862 2863 2864 2865
    QObject *obj;
    QDict *qdict;
    Error *local_err = NULL;

    /* Require an ID in the top level */
    if (!options->has_id) {
        error_setg(errp, "Block device needs an ID");
        goto fail;
    }

2866
    /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with
K
Kevin Wolf 已提交
2867
     * cache.direct=false instead of silently switching to aio=threads, except
2868
     * when called from drive_new().
K
Kevin Wolf 已提交
2869 2870 2871
     *
     * For now, simply forbidding the combination for all drivers will do. */
    if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
2872 2873 2874 2875
        bool direct = options->has_cache &&
                      options->cache->has_direct &&
                      options->cache->direct;
        if (!direct) {
K
Kevin Wolf 已提交
2876 2877 2878 2879 2880 2881 2882
            error_setg(errp, "aio=native requires cache.direct=true");
            goto fail;
        }
    }

    visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
                               &options, NULL, &local_err);
2883
    if (local_err) {
K
Kevin Wolf 已提交
2884 2885 2886 2887 2888 2889 2890 2891 2892
        error_propagate(errp, local_err);
        goto fail;
    }

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

    qdict_flatten(qdict);

2893
    blk = blockdev_init(NULL, qdict, &local_err);
2894
    if (local_err) {
2895
        error_propagate(errp, local_err);
K
Kevin Wolf 已提交
2896 2897 2898
        goto fail;
    }

2899 2900
    if (bdrv_key_required(blk_bs(blk))) {
        blk_unref(blk);
2901 2902 2903 2904
        error_setg(errp, "blockdev-add doesn't support encrypted devices");
        goto fail;
    }

K
Kevin Wolf 已提交
2905 2906 2907 2908
fail:
    qmp_output_visitor_cleanup(ov);
}

2909
BlockJobInfoList *qmp_query_block_jobs(Error **errp)
S
Stefan Hajnoczi 已提交
2910
{
2911 2912
    BlockJobInfoList *head = NULL, **p_next = &head;
    BlockDriverState *bs;
S
Stefan Hajnoczi 已提交
2913

2914
    for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) {
2915 2916 2917 2918
        AioContext *aio_context = bdrv_get_aio_context(bs);

        aio_context_acquire(aio_context);

2919 2920 2921 2922 2923 2924
        if (bs->job) {
            BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
            elem->value = block_job_query(bs->job);
            *p_next = elem;
            p_next = &elem->next;
        }
2925 2926

        aio_context_release(aio_context);
S
Stefan Hajnoczi 已提交
2927 2928
    }

2929
    return head;
S
Stefan Hajnoczi 已提交
2930
}
2931

2932
QemuOptsList qemu_common_drive_opts = {
2933
    .name = "drive",
2934
    .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
2935 2936 2937 2938 2939
    .desc = {
        {
            .name = "snapshot",
            .type = QEMU_OPT_BOOL,
            .help = "enable/disable snapshot mode",
2940 2941 2942 2943
        },{
            .name = "discard",
            .type = QEMU_OPT_STRING,
            .help = "discard operation (ignore/off, unmap/on)",
2944
        },{
K
Kevin Wolf 已提交
2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955
            .name = "cache.writeback",
            .type = QEMU_OPT_BOOL,
            .help = "enables writeback mode for any caches",
        },{
            .name = "cache.direct",
            .type = QEMU_OPT_BOOL,
            .help = "enables use of O_DIRECT (bypass the host page cache)",
        },{
            .name = "cache.no-flush",
            .type = QEMU_OPT_BOOL,
            .help = "ignore any flush requests for the device",
2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972
        },{
            .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",
        },{
2973
            .name = "read-only",
2974 2975 2976
            .type = QEMU_OPT_BOOL,
            .help = "open drive file as read-only",
        },{
2977
            .name = "throttling.iops-total",
2978 2979 2980
            .type = QEMU_OPT_NUMBER,
            .help = "limit total I/O operations per second",
        },{
2981
            .name = "throttling.iops-read",
2982 2983 2984
            .type = QEMU_OPT_NUMBER,
            .help = "limit read operations per second",
        },{
2985
            .name = "throttling.iops-write",
2986 2987 2988
            .type = QEMU_OPT_NUMBER,
            .help = "limit write operations per second",
        },{
2989
            .name = "throttling.bps-total",
2990 2991 2992
            .type = QEMU_OPT_NUMBER,
            .help = "limit total bytes per second",
        },{
2993
            .name = "throttling.bps-read",
2994 2995 2996
            .type = QEMU_OPT_NUMBER,
            .help = "limit read bytes per second",
        },{
2997
            .name = "throttling.bps-write",
2998 2999
            .type = QEMU_OPT_NUMBER,
            .help = "limit write bytes per second",
3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023
        },{
            .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",
3024 3025 3026 3027
        },{
            .name = "throttling.iops-size",
            .type = QEMU_OPT_NUMBER,
            .help = "when limiting by iops max size of an I/O in bytes",
3028 3029 3030 3031
        },{
            .name = "copy-on-read",
            .type = QEMU_OPT_BOOL,
            .help = "copy read data from backing file into image file",
3032 3033 3034 3035
        },{
            .name = "detect-zeroes",
            .type = QEMU_OPT_STRING,
            .help = "try to optimize zero writes (off, on, unmap)",
3036 3037 3038 3039
        },
        { /* end of list */ }
    },
};
3040 3041 3042 3043 3044

QemuOptsList qemu_drive_opts = {
    .name = "drive",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
    .desc = {
3045 3046 3047 3048
        /*
         * no elements => accept any params
         * validation will happen later
         */
3049 3050 3051
        { /* end of list */ }
    },
};