blockdev.c 56.0 KB
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/*
 * QEMU host block devices
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or
 * later.  See the COPYING file in the top-level directory.
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 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
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 */

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#include "sysemu/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 "qapi/qmp/qerror.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 "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 QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
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extern QemuOptsList qemu_common_drive_opts;
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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",
};

static const 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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/*
 * We automatically delete the drive when a device using it gets
 * unplugged.  Questionable feature, but we can't just drop it.
 * Device models call blockdev_mark_auto_del() to schedule the
 * automatic deletion, and generic qdev code calls blockdev_auto_del()
 * when deletion is actually safe.
 */
void blockdev_mark_auto_del(BlockDriverState *bs)
{
    DriveInfo *dinfo = drive_get_by_blockdev(bs);

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    if (bs->job) {
        block_job_cancel(bs->job);
    }
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    if (dinfo) {
        dinfo->auto_del = 1;
    }
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}

void blockdev_auto_del(BlockDriverState *bs)
{
    DriveInfo *dinfo = drive_get_by_blockdev(bs);

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    if (dinfo && dinfo->auto_del) {
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        drive_put_ref(dinfo);
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    }
}

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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)
{
    DriveInfo *dinfo;

    /* seek interface, bus and unit */

    QTAILQ_FOREACH(dinfo, &drives, next) {
        if (dinfo->type == type &&
	    dinfo->bus == bus &&
	    dinfo->unit == unit)
            return dinfo;
    }

    return NULL;
}

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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;
    DriveInfo *dinfo;

    max_bus = -1;
    QTAILQ_FOREACH(dinfo, &drives, next) {
        if(dinfo->type == type &&
           dinfo->bus > max_bus)
            max_bus = dinfo->bus;
    }
    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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DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
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{
    DriveInfo *dinfo;

    QTAILQ_FOREACH(dinfo, &drives, next) {
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        if (dinfo->bdrv == bs) {
            return dinfo;
        }
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    }
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    return NULL;
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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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static void drive_uninit(DriveInfo *dinfo)
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{
    qemu_opts_del(dinfo->opts);
    bdrv_delete(dinfo->bdrv);
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    g_free(dinfo->id);
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    QTAILQ_REMOVE(&drives, dinfo, next);
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    g_free(dinfo->serial);
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    g_free(dinfo);
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}

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void drive_put_ref(DriveInfo *dinfo)
{
    assert(dinfo->refcount);
    if (--dinfo->refcount == 0) {
        drive_uninit(dinfo);
    }
}

void drive_get_ref(DriveInfo *dinfo)
{
    dinfo->refcount++;
}

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typedef struct {
    QEMUBH *bh;
    DriveInfo *dinfo;
} DrivePutRefBH;

static void drive_put_ref_bh(void *opaque)
{
    DrivePutRefBH *s = opaque;

    drive_put_ref(s->dinfo);
    qemu_bh_delete(s->bh);
    g_free(s);
}

/*
 * Release a drive reference in a BH
 *
 * It is not possible to use drive_put_ref() from a callback function when the
 * callers still need the drive.  In such cases we schedule a BH to release the
 * reference.
 */
static void drive_put_ref_bh_schedule(DriveInfo *dinfo)
{
    DrivePutRefBH *s;

    s = g_new(DrivePutRefBH, 1);
    s->bh = qemu_bh_new(drive_put_ref_bh, s);
    s->dinfo = dinfo;
    qemu_bh_schedule(s->bh);
}

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static int parse_block_error_action(const char *buf, bool is_read)
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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_report("'%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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static DriveInfo *blockdev_init(QemuOpts *all_opts,
                                BlockInterfaceType block_default_type)
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{
    const char *buf;
    const char *file = NULL;
    const char *serial;
    const char *mediastr = "";
    BlockInterfaceType type;
    enum { MEDIA_DISK, MEDIA_CDROM } media;
    int bus_id, unit_id;
    int cyls, heads, secs, translation;
    int max_devs;
    int index;
    int ro = 0;
    int bdrv_flags = 0;
    int on_read_error, on_write_error;
    const char *devaddr;
    DriveInfo *dinfo;
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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;
    QDict *bs_opts;
    const char *id;
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    bool has_driver_specific_opts;
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    BlockDriver *drv = NULL;
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    translation = BIOS_ATA_TRANSLATION_AUTO;
    media = MEDIA_DISK;

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    /* Check common options by copying from all_opts to opts, all other options
     * are stored in bs_opts. */
    id = qemu_opts_id(all_opts);
    opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
    if (error_is_set(&error)) {
        qerror_report_err(error);
        error_free(error);
        return NULL;
    }

    bs_opts = qdict_new();
    qemu_opts_to_qdict(all_opts, bs_opts);
    qemu_opts_absorb_qdict(opts, bs_opts, &error);
    if (error_is_set(&error)) {
        qerror_report_err(error);
        error_free(error);
        return NULL;
    }

    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 */
    bus_id  = qemu_opt_get_number(opts, "bus", 0);
    unit_id = qemu_opt_get_number(opts, "unit", -1);
    index   = qemu_opt_get_number(opts, "index", -1);

    cyls  = qemu_opt_get_number(opts, "cyls", 0);
    heads = qemu_opt_get_number(opts, "heads", 0);
    secs  = qemu_opt_get_number(opts, "secs", 0);

    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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    file = qemu_opt_get(opts, "file");
    serial = qemu_opt_get(opts, "serial");

    if ((buf = qemu_opt_get(opts, "if")) != NULL) {
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        for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
            ;
        if (type == IF_COUNT) {
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            error_report("unsupported bus type '%s'", buf);
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            return NULL;
	}
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    } else {
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        type = block_default_type;
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    }
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    max_devs = if_max_devs[type];
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    if (cyls || heads || secs) {
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        if (cyls < 1) {
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            error_report("invalid physical cyls number");
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	    return NULL;
	}
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        if (heads < 1) {
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            error_report("invalid physical heads number");
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	    return NULL;
	}
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        if (secs < 1) {
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            error_report("invalid physical secs number");
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	    return NULL;
	}
    }

    if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
        if (!cyls) {
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            error_report("'%s' trans must be used with cyls, heads and secs",
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                         buf);
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            return NULL;
        }
        if (!strcmp(buf, "none"))
            translation = BIOS_ATA_TRANSLATION_NONE;
        else if (!strcmp(buf, "lba"))
            translation = BIOS_ATA_TRANSLATION_LBA;
        else if (!strcmp(buf, "auto"))
            translation = BIOS_ATA_TRANSLATION_AUTO;
	else {
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            error_report("'%s' invalid translation type", buf);
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	    return NULL;
	}
    }

    if ((buf = qemu_opt_get(opts, "media")) != NULL) {
        if (!strcmp(buf, "disk")) {
	    media = MEDIA_DISK;
	} else if (!strcmp(buf, "cdrom")) {
            if (cyls || secs || heads) {
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                error_report("CHS can't be set with media=%s", buf);
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	        return NULL;
            }
	    media = MEDIA_CDROM;
	} else {
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	    error_report("'%s' invalid media", buf);
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	    return NULL;
	}
    }

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    if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
        if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
            error_report("invalid discard option");
            return NULL;
        }
    }

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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;
    }
    if (qemu_opt_get_bool(opts, "cache.no-flush", true)) {
        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 {
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           error_report("invalid aio option");
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           return NULL;
        }
    }
#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");
            return NULL;
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        }
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        drv = bdrv_find_whitelisted_format(buf, ro);
        if (!drv) {
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            if (!ro && bdrv_find_whitelisted_format(buf, !ro)) {
                error_report("'%s' can be only used as read-only device.", buf);
            } else {
                error_report("'%s' invalid format", buf);
            }
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            return NULL;
        }
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    }

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    /* disk I/O throttling */
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    memset(&cfg, 0, sizeof(cfg));
    cfg.buckets[THROTTLE_BPS_TOTAL].avg =
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        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);
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    cfg.buckets[THROTTLE_OPS_WRITE].avg =
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        qemu_opt_get_number(opts, "throttling.iops-write", 0);
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    cfg.buckets[THROTTLE_BPS_TOTAL].max = 0;
    cfg.buckets[THROTTLE_BPS_READ].max  = 0;
    cfg.buckets[THROTTLE_BPS_WRITE].max = 0;

    cfg.buckets[THROTTLE_OPS_TOTAL].max = 0;
    cfg.buckets[THROTTLE_OPS_READ].max  = 0;
    cfg.buckets[THROTTLE_OPS_WRITE].max = 0;

    cfg.op_size = 0;

    if (!check_throttle_config(&cfg, &error)) {
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        error_report("%s", error_get_pretty(error));
        error_free(error);
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        return NULL;
    }

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    if (qemu_opt_get(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");
    }

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    on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
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    if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
        if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
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            error_report("werror is not supported by this bus type");
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            return NULL;
        }

        on_write_error = parse_block_error_action(buf, 0);
        if (on_write_error < 0) {
            return NULL;
        }
    }

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    on_read_error = BLOCKDEV_ON_ERROR_REPORT;
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    if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
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        if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
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            error_report("rerror is not supported by this bus type");
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            return NULL;
        }

        on_read_error = parse_block_error_action(buf, 1);
        if (on_read_error < 0) {
            return NULL;
        }
    }

    if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
        if (type != IF_VIRTIO) {
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            error_report("addr is not supported by this bus type");
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            return NULL;
        }
    }

    /* compute bus and unit according index */

    if (index != -1) {
        if (bus_id != 0 || unit_id != -1) {
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            error_report("index cannot be used with bus and unit");
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            return NULL;
        }
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        bus_id = drive_index_to_bus_id(type, index);
        unit_id = drive_index_to_unit_id(type, index);
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    }

    /* if user doesn't specify a unit_id,
     * try to find the first free
     */

    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++;
           }
       }
    }

    /* check unit id */

    if (max_devs && unit_id >= max_devs) {
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        error_report("unit %d too big (max is %d)",
                     unit_id, max_devs - 1);
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        return NULL;
    }

    /*
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     * catch multiple definitions
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     */

    if (drive_get(type, bus_id, unit_id) != NULL) {
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        error_report("drive with bus=%d, unit=%d (index=%d) exists",
                     bus_id, unit_id, index);
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        return NULL;
    }

    /* init */

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    dinfo = g_malloc0(sizeof(*dinfo));
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    if ((buf = qemu_opts_id(opts)) != NULL) {
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        dinfo->id = g_strdup(buf);
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    } else {
        /* no id supplied -> create one */
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        dinfo->id = g_malloc0(32);
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        if (type == IF_IDE || type == IF_SCSI)
            mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
        if (max_devs)
            snprintf(dinfo->id, 32, "%s%i%s%i",
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                     if_name[type], bus_id, mediastr, unit_id);
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        else
            snprintf(dinfo->id, 32, "%s%s%i",
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                     if_name[type], mediastr, unit_id);
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    }
    dinfo->bdrv = bdrv_new(dinfo->id);
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    dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
    dinfo->bdrv->read_only = ro;
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    dinfo->devaddr = devaddr;
    dinfo->type = type;
    dinfo->bus = bus_id;
    dinfo->unit = unit_id;
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    dinfo->cyls = cyls;
    dinfo->heads = heads;
    dinfo->secs = secs;
    dinfo->trans = translation;
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    dinfo->opts = all_opts;
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    dinfo->refcount = 1;
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    if (serial != NULL) {
        dinfo->serial = g_strdup(serial);
    }
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    QTAILQ_INSERT_TAIL(&drives, dinfo, next);

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    bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);

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    /* disk I/O throttling */
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    if (throttle_enabled(&cfg)) {
        bdrv_io_limits_enable(dinfo->bdrv);
        bdrv_set_io_limits(dinfo->bdrv, &cfg);
    }
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    switch(type) {
    case IF_IDE:
    case IF_SCSI:
    case IF_XEN:
    case IF_NONE:
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        dinfo->media_cd = media == MEDIA_CDROM;
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        break;
    case IF_SD:
    case IF_FLOPPY:
    case IF_PFLASH:
    case IF_MTD:
        break;
    case IF_VIRTIO:
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    {
653
        /* add virtio block device */
654 655
        QemuOpts *devopts;
        devopts = qemu_opts_create_nofail(qemu_find_opts("device"));
656
        if (arch_type == QEMU_ARCH_S390X) {
657
            qemu_opt_set(devopts, "driver", "virtio-blk-s390");
658
        } else {
659
            qemu_opt_set(devopts, "driver", "virtio-blk-pci");
660
        }
661
        qemu_opt_set(devopts, "drive", dinfo->id);
662
        if (devaddr)
663
            qemu_opt_set(devopts, "addr", devaddr);
664
        break;
665
    }
666
    default:
667 668
        abort();
    }
669
    if (!file || !*file) {
670
        if (has_driver_specific_opts) {
671 672 673 674
            file = NULL;
        } else {
            return dinfo;
        }
675 676 677 678 679 680 681
    }
    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);
    }

682 683 684 685
    if (copy_on_read) {
        bdrv_flags |= BDRV_O_COPY_ON_READ;
    }

686 687 688 689
    if (runstate_check(RUN_STATE_INMIGRATE)) {
        bdrv_flags |= BDRV_O_INCOMING;
    }

690 691 692 693
    if (media == MEDIA_CDROM) {
        /* CDROM is fine for any interface, don't check.  */
        ro = 1;
    } else if (ro == 1) {
694 695
        if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
            type != IF_NONE && type != IF_PFLASH) {
696
            error_report("read-only not supported by this bus type");
697
            goto err;
698 699 700 701 702
        }
    }

    bdrv_flags |= ro ? 0 : BDRV_O_RDWR;

703
    if (ro && copy_on_read) {
704
        error_report("warning: disabling copy_on_read on read-only drive");
705 706
    }

707
    QINCREF(bs_opts);
708
    ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv);
709

710
    if (ret < 0) {
711 712
        if (ret == -EMEDIUMTYPE) {
            error_report("could not open disk image %s: not in %s format",
713 714
                         file ?: dinfo->id, drv ? drv->format_name :
                         qdict_get_str(bs_opts, "driver"));
715 716
        } else {
            error_report("could not open disk image %s: %s",
717
                         file ?: dinfo->id, strerror(-ret));
718
        }
719
        goto err;
720 721 722 723
    }

    if (bdrv_key_required(dinfo->bdrv))
        autostart = 0;
724

725
    QDECREF(bs_opts);
726 727
    qemu_opts_del(opts);

728
    return dinfo;
729 730

err:
731 732
    qemu_opts_del(opts);
    QDECREF(bs_opts);
733
    bdrv_delete(dinfo->bdrv);
734
    g_free(dinfo->id);
735
    QTAILQ_REMOVE(&drives, dinfo, next);
736
    g_free(dinfo);
737
    return NULL;
738 739
}

740 741 742 743 744 745 746 747 748 749 750 751 752
static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
{
    const char *value;

    value = qemu_opt_get(opts, from);
    if (value) {
        qemu_opt_set(opts, to, value);
        qemu_opt_unset(opts, from);
    }
}

DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
{
K
Kevin Wolf 已提交
753 754
    const char *value;

755 756 757 758 759 760 761 762 763
    /* Change legacy command line options into QMP ones */
    qemu_opt_rename(all_opts, "iops", "throttling.iops-total");
    qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read");
    qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write");

    qemu_opt_rename(all_opts, "bps", "throttling.bps-total");
    qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read");
    qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write");

764 765
    qemu_opt_rename(all_opts, "readonly", "read-only");

K
Kevin Wolf 已提交
766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790
    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");
    }

791 792 793
    return blockdev_init(all_opts, block_default_type);
}

794 795 796
void do_commit(Monitor *mon, const QDict *qdict)
{
    const char *device = qdict_get_str(qdict, "device");
797
    BlockDriverState *bs;
798
    int ret;
799

800
    if (!strcmp(device, "all")) {
801
        ret = bdrv_commit_all();
802 803
    } else {
        bs = bdrv_find(device);
804
        if (!bs) {
805
            monitor_printf(mon, "Device '%s' not found\n", device);
806
            return;
807
        }
808
        ret = bdrv_commit(bs);
809 810 811 812
    }
    if (ret < 0) {
        monitor_printf(mon, "'commit' error for '%s': %s\n", device,
                       strerror(-ret));
813 814 815
    }
}

816 817
static void blockdev_do_action(int kind, void *data, Error **errp)
{
818 819
    TransactionAction action;
    TransactionActionList list;
820 821 822 823 824 825 826 827

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

828 829
void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
                                bool has_format, const char *format,
830
                                bool has_mode, enum NewImageMode mode,
831
                                Error **errp)
832
{
833 834 835 836 837 838 839 840
    BlockdevSnapshot snapshot = {
        .device = (char *) device,
        .snapshot_file = (char *) snapshot_file,
        .has_format = has_format,
        .format = (char *) format,
        .has_mode = has_mode,
        .mode = mode,
    };
841 842
    blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
                       &snapshot, errp);
843 844
}

845 846

/* New and old BlockDriverState structs for group snapshots */
847

848
typedef struct BlkTransactionState BlkTransactionState;
849 850 851 852 853 854 855

/* 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. */
856
    void (*prepare)(BlkTransactionState *common, Error **errp);
857
    /* Commit the changes, can be NULL. */
858
    void (*commit)(BlkTransactionState *common);
859
    /* Abort the changes on fail, can be NULL. */
860
    void (*abort)(BlkTransactionState *common);
861
    /* Clean up resource in the end, can be NULL. */
862
    void (*clean)(BlkTransactionState *common);
863 864 865 866 867 868 869
} 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().
 */
870
struct BlkTransactionState {
871
    TransactionAction *action;
872
    const BdrvActionOps *ops;
873
    QSIMPLEQ_ENTRY(BlkTransactionState) entry;
874 875 876
};

/* external snapshot private data */
877 878
typedef struct ExternalSnapshotState {
    BlkTransactionState common;
879 880
    BlockDriverState *old_bs;
    BlockDriverState *new_bs;
881
} ExternalSnapshotState;
882

883
static void external_snapshot_prepare(BlkTransactionState *common,
884 885 886 887 888
                                      Error **errp)
{
    BlockDriver *drv;
    int flags, ret;
    Error *local_err = NULL;
889 890 891 892
    const char *device;
    const char *new_image_file;
    const char *format = "qcow2";
    enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
893 894
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
895
    TransactionAction *action = common->action;
896

897
    /* get parameters */
898
    g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
899 900 901 902 903 904 905 906 907 908 909

    device = action->blockdev_snapshot_sync->device;
    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 */
910 911 912 913 914 915
    drv = bdrv_find_format(format);
    if (!drv) {
        error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
        return;
    }

916 917
    state->old_bs = bdrv_find(device);
    if (!state->old_bs) {
918 919 920 921
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
    }

922
    if (!bdrv_is_inserted(state->old_bs)) {
923 924 925 926
        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
        return;
    }

927
    if (bdrv_in_use(state->old_bs)) {
928 929 930 931
        error_set(errp, QERR_DEVICE_IN_USE, device);
        return;
    }

932 933
    if (!bdrv_is_read_only(state->old_bs)) {
        if (bdrv_flush(state->old_bs)) {
934 935 936 937 938
            error_set(errp, QERR_IO_ERROR);
            return;
        }
    }

939
    flags = state->old_bs->open_flags;
940 941 942 943

    /* create new image w/backing file */
    if (mode != NEW_IMAGE_MODE_EXISTING) {
        bdrv_img_create(new_image_file, format,
944 945
                        state->old_bs->filename,
                        state->old_bs->drv->format_name,
946 947 948 949 950 951 952 953
                        NULL, -1, flags, &local_err, false);
        if (error_is_set(&local_err)) {
            error_propagate(errp, local_err);
            return;
        }
    }

    /* We will manually add the backing_hd field to the bs later */
954
    state->new_bs = bdrv_new("");
955 956
    /* TODO Inherit bs->options or only take explicit options with an
     * extended QMP command? */
957
    ret = bdrv_open(state->new_bs, new_image_file, NULL,
958 959
                    flags | BDRV_O_NO_BACKING, drv);
    if (ret != 0) {
960
        error_setg_file_open(errp, -ret, new_image_file);
961 962 963
    }
}

964
static void external_snapshot_commit(BlkTransactionState *common)
965
{
966 967
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
968

969 970
    /* This removes our old bs and adds the new bs */
    bdrv_append(state->new_bs, state->old_bs);
971 972 973
    /* 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 */
974
    bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
975 976 977
                NULL);
}

978
static void external_snapshot_abort(BlkTransactionState *common)
979
{
980 981 982 983
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
    if (state->new_bs) {
        bdrv_delete(state->new_bs);
984 985 986
    }
}

987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003
typedef struct DriveBackupState {
    BlkTransactionState common;
    BlockDriverState *bs;
    BlockJob *job;
} DriveBackupState;

static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
    DriveBackup *backup;
    Error *local_err = NULL;

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

    qmp_drive_backup(backup->device, backup->target,
                     backup->has_format, backup->format,
1004
                     backup->sync,
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
                     backup->has_mode, backup->mode,
                     backup->has_speed, backup->speed,
                     backup->has_on_source_error, backup->on_source_error,
                     backup->has_on_target_error, backup->on_target_error,
                     &local_err);
    if (error_is_set(&local_err)) {
        error_propagate(errp, local_err);
        state->bs = NULL;
        state->job = NULL;
        return;
    }

    state->bs = bdrv_find(backup->device);
    state->job = state->bs->job;
}

static void drive_backup_abort(BlkTransactionState *common)
{
    DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
    BlockDriverState *bs = state->bs;

    /* Only cancel if it's the job we started */
    if (bs && bs->job && bs->job == state->job) {
        block_job_cancel_sync(bs->job);
    }
}

1032 1033 1034 1035 1036 1037 1038
static void abort_prepare(BlkTransactionState *common, Error **errp)
{
    error_setg(errp, "Transaction aborted using Abort action");
}

static void abort_commit(BlkTransactionState *common)
{
1039
    g_assert_not_reached(); /* this action never succeeds */
1040 1041
}

1042
static const BdrvActionOps actions[] = {
1043
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
1044
        .instance_size = sizeof(ExternalSnapshotState),
1045 1046 1047 1048
        .prepare  = external_snapshot_prepare,
        .commit   = external_snapshot_commit,
        .abort = external_snapshot_abort,
    },
1049 1050 1051 1052 1053
    [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
        .instance_size = sizeof(DriveBackupState),
        .prepare = drive_backup_prepare,
        .abort = drive_backup_abort,
    },
1054 1055 1056 1057 1058
    [TRANSACTION_ACTION_KIND_ABORT] = {
        .instance_size = sizeof(BlkTransactionState),
        .prepare = abort_prepare,
        .commit = abort_commit,
    },
1059 1060
};

1061 1062 1063 1064 1065
/*
 * 'Atomic' group snapshots.  The snapshots are taken as a set, and if any fail
 *  then we do not pivot any of the devices in the group, and abandon the
 *  snapshots
 */
1066
void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1067
{
1068
    TransactionActionList *dev_entry = dev_list;
1069
    BlkTransactionState *state, *next;
1070
    Error *local_err = NULL;
1071

1072
    QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1073 1074 1075 1076 1077 1078 1079
    QSIMPLEQ_INIT(&snap_bdrv_states);

    /* drain all i/o before any snapshots */
    bdrv_drain_all();

    /* We don't do anything in this loop that commits us to the snapshot */
    while (NULL != dev_entry) {
1080
        TransactionAction *dev_info = NULL;
1081
        const BdrvActionOps *ops;
1082

1083 1084 1085
        dev_info = dev_entry->value;
        dev_entry = dev_entry->next;

1086 1087 1088
        assert(dev_info->kind < ARRAY_SIZE(actions));

        ops = &actions[dev_info->kind];
1089 1090 1091 1092
        state = g_malloc0(ops->instance_size);
        state->ops = ops;
        state->action = dev_info;
        QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1093

1094
        state->ops->prepare(state, &local_err);
1095 1096 1097
        if (error_is_set(&local_err)) {
            error_propagate(errp, local_err);
            goto delete_and_fail;
1098 1099 1100
        }
    }

1101
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1102 1103 1104
        if (state->ops->commit) {
            state->ops->commit(state);
        }
1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
    }

    /* success */
    goto exit;

delete_and_fail:
    /*
    * failure, and it is all-or-none; abandon each new bs, and keep using
    * the original bs for all images
    */
1115 1116 1117
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
        if (state->ops->abort) {
            state->ops->abort(state);
1118
        }
1119 1120
    }
exit:
1121 1122 1123
    QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
        if (state->ops->clean) {
            state->ops->clean(state);
1124
        }
1125
        g_free(state);
1126 1127 1128 1129
    }
}


1130
static void eject_device(BlockDriverState *bs, int force, Error **errp)
1131
{
1132 1133 1134 1135
    if (bdrv_in_use(bs)) {
        error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
        return;
    }
1136
    if (!bdrv_dev_has_removable_media(bs)) {
1137 1138
        error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
        return;
1139
    }
1140

P
Paolo Bonzini 已提交
1141 1142 1143
    if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
        bdrv_dev_eject_request(bs, force);
        if (!force) {
1144 1145
            error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
            return;
P
Paolo Bonzini 已提交
1146
        }
1147
    }
1148

1149
    bdrv_close(bs);
1150 1151
}

L
Luiz Capitulino 已提交
1152
void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1153 1154 1155
{
    BlockDriverState *bs;

L
Luiz Capitulino 已提交
1156
    bs = bdrv_find(device);
1157
    if (!bs) {
L
Luiz Capitulino 已提交
1158 1159
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1160 1161
    }

L
Luiz Capitulino 已提交
1162
    eject_device(bs, force, errp);
1163 1164
}

L
Luiz Capitulino 已提交
1165
void qmp_block_passwd(const char *device, const char *password, Error **errp)
1166 1167 1168 1169
{
    BlockDriverState *bs;
    int err;

L
Luiz Capitulino 已提交
1170
    bs = bdrv_find(device);
1171
    if (!bs) {
L
Luiz Capitulino 已提交
1172 1173
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1174 1175
    }

L
Luiz Capitulino 已提交
1176
    err = bdrv_set_key(bs, password);
1177
    if (err == -EINVAL) {
L
Luiz Capitulino 已提交
1178 1179
        error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
        return;
1180
    } else if (err < 0) {
L
Luiz Capitulino 已提交
1181 1182
        error_set(errp, QERR_INVALID_PASSWORD);
        return;
1183 1184 1185
    }
}

L
Luiz Capitulino 已提交
1186 1187 1188 1189
static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
                                    int bdrv_flags, BlockDriver *drv,
                                    const char *password, Error **errp)
{
1190 1191 1192 1193 1194
    int ret;

    ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv);
    if (ret < 0) {
        error_setg_file_open(errp, -ret, filename);
L
Luiz Capitulino 已提交
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213
        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,
                         bool has_format, const char *format, Error **errp)
1214 1215 1216 1217
{
    BlockDriverState *bs;
    BlockDriver *drv = NULL;
    int bdrv_flags;
1218
    Error *err = NULL;
1219 1220 1221

    bs = bdrv_find(device);
    if (!bs) {
L
Luiz Capitulino 已提交
1222 1223
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1224
    }
L
Luiz Capitulino 已提交
1225 1226

    if (format) {
1227
        drv = bdrv_find_whitelisted_format(format, bs->read_only);
1228
        if (!drv) {
L
Luiz Capitulino 已提交
1229 1230
            error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
            return;
1231 1232
        }
    }
L
Luiz Capitulino 已提交
1233

1234 1235
    eject_device(bs, 0, &err);
    if (error_is_set(&err)) {
L
Luiz Capitulino 已提交
1236 1237
        error_propagate(errp, err);
        return;
1238
    }
L
Luiz Capitulino 已提交
1239

1240
    bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1241
    bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
L
Luiz Capitulino 已提交
1242 1243

    qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1244
}
1245

Z
Zhi Yong Wu 已提交
1246
/* throttling disk I/O limits */
1247 1248 1249
void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
                               int64_t bps_wr, int64_t iops, int64_t iops_rd,
                               int64_t iops_wr, Error **errp)
Z
Zhi Yong Wu 已提交
1250
{
1251
    ThrottleConfig cfg;
Z
Zhi Yong Wu 已提交
1252 1253
    BlockDriverState *bs;

1254
    bs = bdrv_find(device);
Z
Zhi Yong Wu 已提交
1255
    if (!bs) {
1256 1257
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
Z
Zhi Yong Wu 已提交
1258 1259
    }

1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275
    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;

    cfg.buckets[THROTTLE_BPS_TOTAL].max = 0;
    cfg.buckets[THROTTLE_BPS_READ].max  = 0;
    cfg.buckets[THROTTLE_BPS_WRITE].max = 0;

    cfg.buckets[THROTTLE_OPS_TOTAL].max = 0;
    cfg.buckets[THROTTLE_OPS_READ].max  = 0;
    cfg.buckets[THROTTLE_OPS_WRITE].max = 0;
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Zhi Yong Wu 已提交
1276

1277 1278 1279
    cfg.op_size = 0;

    if (!check_throttle_config(&cfg, errp)) {
1280
        return;
Z
Zhi Yong Wu 已提交
1281 1282
    }

1283
    if (!bs->io_limits_enabled && throttle_enabled(&cfg)) {
Z
Zhi Yong Wu 已提交
1284
        bdrv_io_limits_enable(bs);
1285
    } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) {
Z
Zhi Yong Wu 已提交
1286
        bdrv_io_limits_disable(bs);
1287 1288 1289 1290
    }

    if (bs->io_limits_enabled) {
        bdrv_set_io_limits(bs, &cfg);
Z
Zhi Yong Wu 已提交
1291 1292 1293
    }
}

1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
    const char *id = qdict_get_str(qdict, "id");
    BlockDriverState *bs;

    bs = bdrv_find(id);
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, id);
        return -1;
    }
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1304 1305 1306 1307
    if (bdrv_in_use(bs)) {
        qerror_report(QERR_DEVICE_IN_USE, id);
        return -1;
    }
1308 1309

    /* quiesce block driver; prevent further io */
1310
    bdrv_drain_all();
1311 1312 1313
    bdrv_flush(bs);
    bdrv_close(bs);

1314
    /* if we have a device attached to this BlockDriverState
1315 1316 1317 1318
     * 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.
     */
1319
    if (bdrv_get_attached_dev(bs)) {
1320
        bdrv_make_anon(bs);
1321 1322 1323 1324

        /* Further I/O must not pause the guest */
        bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
                          BLOCKDEV_ON_ERROR_REPORT);
1325 1326
    } else {
        drive_uninit(drive_get_by_blockdev(bs));
1327 1328 1329 1330
    }

    return 0;
}
1331

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Luiz Capitulino 已提交
1332
void qmp_block_resize(const char *device, int64_t size, Error **errp)
1333 1334
{
    BlockDriverState *bs;
1335
    int ret;
1336 1337 1338

    bs = bdrv_find(device);
    if (!bs) {
L
Luiz Capitulino 已提交
1339 1340
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1341 1342 1343
    }

    if (size < 0) {
1344
        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
L
Luiz Capitulino 已提交
1345
        return;
1346 1347
    }

1348 1349 1350
    /* complete all in-flight operations before resizing the device */
    bdrv_drain_all();

1351 1352
    ret = bdrv_truncate(bs, size);
    switch (ret) {
1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367
    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:
1368
        error_setg_errno(errp, -ret, "Could not resize");
1369
        break;
1370 1371
    }
}
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Stefan Hajnoczi 已提交
1372

1373
static void block_job_cb(void *opaque, int ret)
S
Stefan Hajnoczi 已提交
1374 1375 1376 1377
{
    BlockDriverState *bs = opaque;
    QObject *obj;

1378
    trace_block_job_cb(bs, bs->job, ret);
S
Stefan Hajnoczi 已提交
1379 1380 1381 1382 1383 1384 1385 1386

    assert(bs->job);
    obj = qobject_from_block_job(bs->job);
    if (ret < 0) {
        QDict *dict = qobject_to_qdict(obj);
        qdict_put(dict, "error", qstring_from_str(strerror(-ret)));
    }

1387 1388 1389 1390 1391
    if (block_job_is_cancelled(bs->job)) {
        monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
    } else {
        monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
    }
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Stefan Hajnoczi 已提交
1392
    qobject_decref(obj);
1393 1394

    drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
S
Stefan Hajnoczi 已提交
1395 1396 1397
}

void qmp_block_stream(const char *device, bool has_base,
P
Paolo Bonzini 已提交
1398 1399 1400
                      const char *base, bool has_speed, int64_t speed,
                      bool has_on_error, BlockdevOnError on_error,
                      Error **errp)
S
Stefan Hajnoczi 已提交
1401 1402
{
    BlockDriverState *bs;
1403
    BlockDriverState *base_bs = NULL;
1404
    Error *local_err = NULL;
S
Stefan Hajnoczi 已提交
1405

P
Paolo Bonzini 已提交
1406 1407 1408 1409
    if (!has_on_error) {
        on_error = BLOCKDEV_ON_ERROR_REPORT;
    }

S
Stefan Hajnoczi 已提交
1410 1411 1412 1413 1414 1415 1416
    bs = bdrv_find(device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
    }

    if (base) {
1417 1418 1419 1420 1421
        base_bs = bdrv_find_backing_image(bs, base);
        if (base_bs == NULL) {
            error_set(errp, QERR_BASE_NOT_FOUND, base);
            return;
        }
S
Stefan Hajnoczi 已提交
1422 1423
    }

1424
    stream_start(bs, base_bs, base, has_speed ? speed : 0,
P
Paolo Bonzini 已提交
1425
                 on_error, block_job_cb, bs, &local_err);
1426 1427 1428
    if (error_is_set(&local_err)) {
        error_propagate(errp, local_err);
        return;
S
Stefan Hajnoczi 已提交
1429 1430
    }

1431 1432 1433 1434 1435
    /* Grab a reference so hotplug does not delete the BlockDriverState from
     * underneath us.
     */
    drive_get_ref(drive_get_by_blockdev(bs));

S
Stefan Hajnoczi 已提交
1436 1437
    trace_qmp_block_stream(bs, bs->job);
}
1438

1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449
void qmp_block_commit(const char *device,
                      bool has_base, const char *base, const char *top,
                      bool has_speed, int64_t speed,
                      Error **errp)
{
    BlockDriverState *bs;
    BlockDriverState *base_bs, *top_bs;
    Error *local_err = NULL;
    /* This will be part of the QMP command, if/when the
     * BlockdevOnError change for blkmirror makes it in
     */
1450
    BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474

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

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

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

    if (top) {
        if (strcmp(bs->filename, top) != 0) {
            top_bs = bdrv_find_backing_image(bs, top);
        }
    }

    if (top_bs == NULL) {
        error_setg(errp, "Top image file %s not found", top ? top : "NULL");
        return;
    }

1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485
    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");
        return;
    }

1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
    commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs,
                &local_err);
    if (local_err != NULL) {
        error_propagate(errp, local_err);
        return;
    }
    /* Grab a reference so hotplug does not delete the BlockDriverState from
     * underneath us.
     */
    drive_get_ref(drive_get_by_blockdev(bs));
}

1498 1499
void qmp_drive_backup(const char *device, const char *target,
                      bool has_format, const char *format,
1500
                      enum MirrorSyncMode sync,
1501 1502 1503 1504 1505 1506 1507 1508
                      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;
1509
    BlockDriverState *source = NULL;
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557
    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;
    }

    if (!bdrv_is_inserted(bs)) {
        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
        return;
    }

    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);
            return;
        }
    }

    if (bdrv_in_use(bs)) {
        error_set(errp, QERR_DEVICE_IN_USE, device);
        return;
    }

    flags = bs->open_flags | BDRV_O_RDWR;

1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
    /* 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;
    }

1570 1571 1572 1573 1574 1575 1576 1577
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
        return;
    }

    if (mode != NEW_IMAGE_MODE_EXISTING) {
        assert(format && drv);
1578 1579 1580 1581 1582 1583 1584 1585
        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);
        }
1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600
    }

    if (error_is_set(&local_err)) {
        error_propagate(errp, local_err);
        return;
    }

    target_bs = bdrv_new("");
    ret = bdrv_open(target_bs, target, NULL, flags, drv);
    if (ret < 0) {
        bdrv_delete(target_bs);
        error_setg_file_open(errp, -ret, target);
        return;
    }

1601
    backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614
                 block_job_cb, bs, &local_err);
    if (local_err != NULL) {
        bdrv_delete(target_bs);
        error_propagate(errp, local_err);
        return;
    }

    /* Grab a reference so hotplug does not delete the BlockDriverState from
     * underneath us.
     */
    drive_get_ref(drive_get_by_blockdev(bs));
}

1615 1616
#define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)

P
Paolo Bonzini 已提交
1617 1618 1619 1620
void qmp_drive_mirror(const char *device, const char *target,
                      bool has_format, const char *format,
                      enum MirrorSyncMode sync,
                      bool has_mode, enum NewImageMode mode,
1621
                      bool has_speed, int64_t speed,
1622
                      bool has_granularity, uint32_t granularity,
1623
                      bool has_buf_size, int64_t buf_size,
1624 1625 1626
                      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
1627 1628 1629 1630 1631 1632
{
    BlockDriverState *bs;
    BlockDriverState *source, *target_bs;
    BlockDriver *drv = NULL;
    Error *local_err = NULL;
    int flags;
1633
    int64_t size;
P
Paolo Bonzini 已提交
1634 1635 1636 1637 1638
    int ret;

    if (!has_speed) {
        speed = 0;
    }
1639 1640 1641 1642 1643 1644
    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
1645 1646 1647
    if (!has_mode) {
        mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
    }
1648 1649 1650
    if (!has_granularity) {
        granularity = 0;
    }
1651 1652 1653 1654
    if (!has_buf_size) {
        buf_size = DEFAULT_MIRROR_BUF_SIZE;
    }

1655 1656 1657 1658 1659 1660 1661 1662
    if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
        error_set(errp, QERR_INVALID_PARAMETER, device);
        return;
    }
    if (granularity & (granularity - 1)) {
        error_set(errp, QERR_INVALID_PARAMETER, device);
        return;
    }
P
Paolo Bonzini 已提交
1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696

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

    if (!bdrv_is_inserted(bs)) {
        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
        return;
    }

    if (!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);
            return;
        }
    }

    if (bdrv_in_use(bs)) {
        error_set(errp, QERR_DEVICE_IN_USE, device);
        return;
    }

    flags = bs->open_flags | BDRV_O_RDWR;
    source = bs->backing_hd;
    if (!source && sync == MIRROR_SYNC_MODE_TOP) {
        sync = MIRROR_SYNC_MODE_FULL;
    }

1697 1698 1699 1700 1701 1702
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
        return;
    }

P
Paolo Bonzini 已提交
1703 1704 1705
    if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
        /* create new image w/o backing file */
        assert(format && drv);
1706
        bdrv_img_create(target, format,
1707
                        NULL, NULL, NULL, size, flags, &local_err, false);
P
Paolo Bonzini 已提交
1708 1709 1710 1711 1712 1713 1714
    } else {
        switch (mode) {
        case NEW_IMAGE_MODE_EXISTING:
            ret = 0;
            break;
        case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
            /* create new image with backing file */
1715 1716 1717
            bdrv_img_create(target, format,
                            source->filename,
                            source->drv->format_name,
1718
                            NULL, size, flags, &local_err, false);
P
Paolo Bonzini 已提交
1719 1720 1721 1722 1723 1724
            break;
        default:
            abort();
        }
    }

1725 1726
    if (error_is_set(&local_err)) {
        error_propagate(errp, local_err);
P
Paolo Bonzini 已提交
1727 1728 1729
        return;
    }

1730 1731 1732
    /* Mirroring takes care of copy-on-write using the source's backing
     * file.
     */
P
Paolo Bonzini 已提交
1733
    target_bs = bdrv_new("");
1734
    ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv);
P
Paolo Bonzini 已提交
1735 1736
    if (ret < 0) {
        bdrv_delete(target_bs);
1737
        error_setg_file_open(errp, -ret, target);
P
Paolo Bonzini 已提交
1738 1739 1740
        return;
    }

1741
    mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1742
                 on_source_error, on_target_error,
1743
                 block_job_cb, bs, &local_err);
P
Paolo Bonzini 已提交
1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755
    if (local_err != NULL) {
        bdrv_delete(target_bs);
        error_propagate(errp, local_err);
        return;
    }

    /* Grab a reference so hotplug does not delete the BlockDriverState from
     * underneath us.
     */
    drive_get_ref(drive_get_by_blockdev(bs));
}

1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766
static BlockJob *find_block_job(const char *device)
{
    BlockDriverState *bs;

    bs = bdrv_find(device);
    if (!bs || !bs->job) {
        return NULL;
    }
    return bs->job;
}

1767
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1768 1769 1770 1771
{
    BlockJob *job = find_block_job(device);

    if (!job) {
1772
        error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1773 1774 1775
        return;
    }

1776
    block_job_set_speed(job, speed, errp);
1777
}
1778

1779 1780
void qmp_block_job_cancel(const char *device,
                          bool has_force, bool force, Error **errp)
1781 1782 1783
{
    BlockJob *job = find_block_job(device);

1784 1785 1786 1787
    if (!has_force) {
        force = false;
    }

1788
    if (!job) {
1789
        error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1790 1791
        return;
    }
1792
    if (job->paused && !force) {
1793 1794 1795
        error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
        return;
    }
1796 1797 1798 1799

    trace_qmp_block_job_cancel(job);
    block_job_cancel(job);
}
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Stefan Hajnoczi 已提交
1800

1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826
void qmp_block_job_pause(const char *device, Error **errp)
{
    BlockJob *job = find_block_job(device);

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

    trace_qmp_block_job_pause(job);
    block_job_pause(job);
}

void qmp_block_job_resume(const char *device, Error **errp)
{
    BlockJob *job = find_block_job(device);

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

    trace_qmp_block_job_resume(job);
    block_job_resume(job);
}

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Paolo Bonzini 已提交
1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839
void qmp_block_job_complete(const char *device, Error **errp)
{
    BlockJob *job = find_block_job(device);

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

    trace_qmp_block_job_complete(job);
    block_job_complete(job, errp);
}

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Stefan Hajnoczi 已提交
1840 1841 1842 1843 1844 1845
static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
{
    BlockJobInfoList **prev = opaque;
    BlockJob *job = bs->job;

    if (job) {
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Paolo Bonzini 已提交
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        BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
        elem->value = block_job_query(bs->job);
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Stefan Hajnoczi 已提交
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        (*prev)->next = elem;
        *prev = elem;
    }
}

BlockJobInfoList *qmp_query_block_jobs(Error **errp)
{
    /* Dummy is a fake list element for holding the head pointer */
    BlockJobInfoList dummy = {};
    BlockJobInfoList *prev = &dummy;
    bdrv_iterate(do_qmp_query_block_jobs_one, &prev);
    return dummy.next;
}
1861

1862
QemuOptsList qemu_common_drive_opts = {
1863
    .name = "drive",
1864
    .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
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    .desc = {
        {
            .name = "bus",
            .type = QEMU_OPT_NUMBER,
            .help = "bus number",
        },{
            .name = "unit",
            .type = QEMU_OPT_NUMBER,
            .help = "unit number (i.e. lun for scsi)",
        },{
            .name = "if",
            .type = QEMU_OPT_STRING,
            .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
        },{
            .name = "index",
            .type = QEMU_OPT_NUMBER,
            .help = "index number",
        },{
            .name = "cyls",
            .type = QEMU_OPT_NUMBER,
            .help = "number of cylinders (ide disk geometry)",
        },{
            .name = "heads",
            .type = QEMU_OPT_NUMBER,
            .help = "number of heads (ide disk geometry)",
        },{
            .name = "secs",
            .type = QEMU_OPT_NUMBER,
            .help = "number of sectors (ide disk geometry)",
        },{
            .name = "trans",
            .type = QEMU_OPT_STRING,
            .help = "chs translation (auto, lba. none)",
        },{
            .name = "media",
            .type = QEMU_OPT_STRING,
            .help = "media type (disk, cdrom)",
        },{
            .name = "snapshot",
            .type = QEMU_OPT_BOOL,
            .help = "enable/disable snapshot mode",
        },{
            .name = "file",
            .type = QEMU_OPT_STRING,
            .help = "disk image",
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        },{
            .name = "discard",
            .type = QEMU_OPT_STRING,
            .help = "discard operation (ignore/off, unmap/on)",
1914
        },{
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            .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",
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        },{
            .name = "aio",
            .type = QEMU_OPT_STRING,
            .help = "host AIO implementation (threads, native)",
        },{
            .name = "format",
            .type = QEMU_OPT_STRING,
            .help = "disk format (raw, qcow2, ...)",
        },{
            .name = "serial",
            .type = QEMU_OPT_STRING,
            .help = "disk serial number",
        },{
            .name = "rerror",
            .type = QEMU_OPT_STRING,
            .help = "read error action",
        },{
            .name = "werror",
            .type = QEMU_OPT_STRING,
            .help = "write error action",
        },{
            .name = "addr",
            .type = QEMU_OPT_STRING,
            .help = "pci address (virtio only)",
        },{
1951
            .name = "read-only",
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            .type = QEMU_OPT_BOOL,
            .help = "open drive file as read-only",
        },{
1955
            .name = "throttling.iops-total",
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            .type = QEMU_OPT_NUMBER,
            .help = "limit total I/O operations per second",
        },{
1959
            .name = "throttling.iops-read",
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            .type = QEMU_OPT_NUMBER,
            .help = "limit read operations per second",
        },{
1963
            .name = "throttling.iops-write",
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            .type = QEMU_OPT_NUMBER,
            .help = "limit write operations per second",
        },{
1967
            .name = "throttling.bps-total",
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            .type = QEMU_OPT_NUMBER,
            .help = "limit total bytes per second",
        },{
1971
            .name = "throttling.bps-read",
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            .type = QEMU_OPT_NUMBER,
            .help = "limit read bytes per second",
        },{
1975
            .name = "throttling.bps-write",
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            .type = QEMU_OPT_NUMBER,
            .help = "limit write bytes per second",
        },{
            .name = "copy-on-read",
            .type = QEMU_OPT_BOOL,
            .help = "copy read data from backing file into image file",
        },{
            .name = "boot",
            .type = QEMU_OPT_BOOL,
            .help = "(deprecated, ignored)",
        },
        { /* end of list */ }
    },
};
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QemuOptsList qemu_drive_opts = {
    .name = "drive",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
    .desc = {
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        /*
         * no elements => accept any params
         * validation will happen later
         */
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        { /* end of list */ }
    },
};