blockdev.c 50.3 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 do_check_io_limits(BlockIOLimit *io_limits, Error **errp)
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{
    bool bps_flag;
    bool iops_flag;

    assert(io_limits);

    bps_flag  = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0)
                 && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0)
                 || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0));
    iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0)
                 && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0)
                 || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0));
    if (bps_flag || iops_flag) {
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        error_setg(errp, "bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) "
                         "cannot be used at the same time");
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        return false;
    }

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    if (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] < 0 ||
        io_limits->bps[BLOCK_IO_LIMIT_WRITE] < 0 ||
        io_limits->bps[BLOCK_IO_LIMIT_READ] < 0 ||
        io_limits->iops[BLOCK_IO_LIMIT_TOTAL] < 0 ||
        io_limits->iops[BLOCK_IO_LIMIT_WRITE] < 0 ||
        io_limits->iops[BLOCK_IO_LIMIT_READ] < 0) {
        error_setg(errp, "bps and iops values must be 0 or greater");
        return false;
    }

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    return true;
}

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DriveInfo *drive_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;
    BlockDriver *drv = NULL;
    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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    BlockIOLimit io_limits;
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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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    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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    /* 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);
    ro = qemu_opt_get_bool(opts, "readonly", 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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    bdrv_flags |= BDRV_O_CACHE_WB;
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    if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
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        if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) {
            error_report("invalid cache option");
            return NULL;
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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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        }
        drv = bdrv_find_whitelisted_format(buf);
        if (!drv) {
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            error_report("'%s' invalid format", buf);
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            return NULL;
        }
    }

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    /* disk I/O throttling */
    io_limits.bps[BLOCK_IO_LIMIT_TOTAL]  =
                           qemu_opt_get_number(opts, "bps", 0);
    io_limits.bps[BLOCK_IO_LIMIT_READ]   =
                           qemu_opt_get_number(opts, "bps_rd", 0);
    io_limits.bps[BLOCK_IO_LIMIT_WRITE]  =
                           qemu_opt_get_number(opts, "bps_wr", 0);
    io_limits.iops[BLOCK_IO_LIMIT_TOTAL] =
                           qemu_opt_get_number(opts, "iops", 0);
    io_limits.iops[BLOCK_IO_LIMIT_READ]  =
                           qemu_opt_get_number(opts, "iops_rd", 0);
    io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
                           qemu_opt_get_number(opts, "iops_wr", 0);

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    if (!do_check_io_limits(&io_limits, &error)) {
        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 */
    bdrv_set_io_limits(dinfo->bdrv, &io_limits);

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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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    {
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        /* add virtio block device */
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        QemuOpts *devopts;
        devopts = qemu_opts_create_nofail(qemu_find_opts("device"));
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        if (arch_type == QEMU_ARCH_S390X) {
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            qemu_opt_set(devopts, "driver", "virtio-blk-s390");
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        } else {
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            qemu_opt_set(devopts, "driver", "virtio-blk-pci");
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        }
652
        qemu_opt_set(devopts, "drive", dinfo->id);
653
        if (devaddr)
654
            qemu_opt_set(devopts, "addr", devaddr);
655
        break;
656
    }
657
    default:
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        abort();
    }
660
    if (!file || !*file) {
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        if (qdict_size(bs_opts)) {
            file = NULL;
        } else {
            return dinfo;
        }
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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);
    }

673 674 675 676
    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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    if (media == MEDIA_CDROM) {
        /* CDROM is fine for any interface, don't check.  */
        ro = 1;
    } else if (ro == 1) {
685 686
        if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
            type != IF_NONE && type != IF_PFLASH) {
687
            error_report("readonly not supported by this bus type");
688
            goto err;
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        }
    }

    bdrv_flags |= ro ? 0 : BDRV_O_RDWR;

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    if (ro && copy_on_read) {
        error_report("warning: disabling copy_on_read on readonly drive");
    }

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    ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv);
    bs_opts = NULL;

701
    if (ret < 0) {
702 703
        if (ret == -EMEDIUMTYPE) {
            error_report("could not open disk image %s: not in %s format",
704
                         file ?: dinfo->id, drv->format_name);
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        } else {
            error_report("could not open disk image %s: %s",
707
                         file ?: dinfo->id, strerror(-ret));
708
        }
709
        goto err;
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    }

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

717
    return dinfo;
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err:
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    qemu_opts_del(opts);
    QDECREF(bs_opts);
722
    bdrv_delete(dinfo->bdrv);
723
    g_free(dinfo->id);
724
    QTAILQ_REMOVE(&drives, dinfo, next);
725
    g_free(dinfo);
726
    return NULL;
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}

void do_commit(Monitor *mon, const QDict *qdict)
{
    const char *device = qdict_get_str(qdict, "device");
732
    BlockDriverState *bs;
733
    int ret;
734

735
    if (!strcmp(device, "all")) {
736
        ret = bdrv_commit_all();
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    } else {
        bs = bdrv_find(device);
739
        if (!bs) {
740
            monitor_printf(mon, "Device '%s' not found\n", device);
741
            return;
742
        }
743
        ret = bdrv_commit(bs);
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    }
    if (ret < 0) {
        monitor_printf(mon, "'commit' error for '%s': %s\n", device,
                       strerror(-ret));
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    }
}

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static void blockdev_do_action(int kind, void *data, Error **errp)
{
    BlockdevAction action;
    BlockdevActionList list;

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

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void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
                                bool has_format, const char *format,
765
                                bool has_mode, enum NewImageMode mode,
766
                                Error **errp)
767
{
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    BlockdevSnapshot snapshot = {
        .device = (char *) device,
        .snapshot_file = (char *) snapshot_file,
        .has_format = has_format,
        .format = (char *) format,
        .has_mode = has_mode,
        .mode = mode,
    };
    blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot,
                       errp);
778 779
}

780 781

/* New and old BlockDriverState structs for group snapshots */
782
typedef struct BlkTransactionStates {
783 784
    BlockDriverState *old_bs;
    BlockDriverState *new_bs;
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    QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
} BlkTransactionStates;
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788
static void external_snapshot_prepare(BlockdevAction *action,
789 790 791 792 793 794 795
                                      BlkTransactionStates *states,
                                      Error **errp)
{
    BlockDriver *proto_drv;
    BlockDriver *drv;
    int flags, ret;
    Error *local_err = NULL;
796 797 798 799
    const char *device;
    const char *new_image_file;
    const char *format = "qcow2";
    enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
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801 802 803 804 805 806 807 808 809 810 811 812 813
    /* get parameters */
    g_assert(action->kind == BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);

    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 */
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    drv = bdrv_find_format(format);
    if (!drv) {
        error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
        return;
    }

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

    if (!bdrv_is_inserted(states->old_bs)) {
        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
        return;
    }

    if (bdrv_in_use(states->old_bs)) {
        error_set(errp, QERR_DEVICE_IN_USE, device);
        return;
    }

    if (!bdrv_is_read_only(states->old_bs)) {
        if (bdrv_flush(states->old_bs)) {
            error_set(errp, QERR_IO_ERROR);
            return;
        }
    }

    flags = states->old_bs->open_flags;

    proto_drv = bdrv_find_protocol(new_image_file);
    if (!proto_drv) {
        error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
        return;
    }

    /* create new image w/backing file */
    if (mode != NEW_IMAGE_MODE_EXISTING) {
        bdrv_img_create(new_image_file, format,
                        states->old_bs->filename,
                        states->old_bs->drv->format_name,
                        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 */
    states->new_bs = bdrv_new("");
    /* TODO Inherit bs->options or only take explicit options with an
     * extended QMP command? */
    ret = bdrv_open(states->new_bs, new_image_file, NULL,
                    flags | BDRV_O_NO_BACKING, drv);
    if (ret != 0) {
        error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
    }
}

874 875 876 877 878 879 880 881 882 883 884
static void external_snapshot_commit(BlkTransactionStates *states)
{
    /* This removes our old bs from the bdrv_states, and adds the new bs */
    bdrv_append(states->new_bs, states->old_bs);
    /* We don't need (or want) to use the transactional
     * bdrv_reopen_multiple() across all the entries at once, because we
     * don't want to abort all of them if one of them fails the reopen */
    bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR,
                NULL);
}

885 886 887 888 889 890 891
static void external_snapshot_abort(BlkTransactionStates *states)
{
    if (states->new_bs) {
        bdrv_delete(states->new_bs);
    }
}

892 893 894 895 896
/*
 * '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
 */
897
void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
898
{
899 900
    BlockdevActionList *dev_entry = dev_list;
    BlkTransactionStates *states, *next;
901
    Error *local_err = NULL;
902

903
    QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
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    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) {
911 912
        BlockdevAction *dev_info = NULL;

913 914 915
        dev_info = dev_entry->value;
        dev_entry = dev_entry->next;

916
        states = g_malloc0(sizeof(BlkTransactionStates));
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        QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);

919 920
        switch (dev_info->kind) {
        case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
921
            external_snapshot_prepare(dev_info, states, errp);
922 923
            if (error_is_set(&local_err)) {
                error_propagate(errp, local_err);
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                goto delete_and_fail;
            }
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            break;
        default:
            abort();
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        }

    }


    /* Now we are going to do the actual pivot.  Everything up to this point
     * is reversible, but we are committed at this point */
    QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
937
        external_snapshot_commit(states);
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    }

    /* success */
    goto exit;

delete_and_fail:
    /*
    * failure, and it is all-or-none; abandon each new bs, and keep using
    * the original bs for all images
    */
    QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) {
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        external_snapshot_abort(states);
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    }
exit:
952
    QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
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        g_free(states);
    }
}


958
static void eject_device(BlockDriverState *bs, int force, Error **errp)
959
{
960 961 962 963
    if (bdrv_in_use(bs)) {
        error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
        return;
    }
964
    if (!bdrv_dev_has_removable_media(bs)) {
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        error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
        return;
967
    }
968

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    if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
        bdrv_dev_eject_request(bs, force);
        if (!force) {
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            error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
            return;
974
        }
975
    }
976

977
    bdrv_close(bs);
978 979
}

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void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
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{
    BlockDriverState *bs;

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

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    eject_device(bs, force, errp);
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}

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void qmp_block_passwd(const char *device, const char *password, Error **errp)
994 995 996 997
{
    BlockDriverState *bs;
    int err;

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    bs = bdrv_find(device);
999
    if (!bs) {
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        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1002 1003
    }

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    err = bdrv_set_key(bs, password);
1005
    if (err == -EINVAL) {
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        error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
        return;
1008
    } else if (err < 0) {
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        error_set(errp, QERR_INVALID_PASSWORD);
        return;
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    }
}

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static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
                                    int bdrv_flags, BlockDriver *drv,
                                    const char *password, Error **errp)
{
1018
    if (bdrv_open(bs, filename, NULL, bdrv_flags, drv) < 0) {
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        error_set(errp, QERR_OPEN_FILE_FAILED, filename);
        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)
1039 1040 1041 1042
{
    BlockDriverState *bs;
    BlockDriver *drv = NULL;
    int bdrv_flags;
1043
    Error *err = NULL;
1044 1045 1046

    bs = bdrv_find(device);
    if (!bs) {
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        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1049
    }
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    if (format) {
        drv = bdrv_find_whitelisted_format(format);
1053
        if (!drv) {
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            error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
            return;
1056 1057
        }
    }
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1059 1060
    eject_device(bs, 0, &err);
    if (error_is_set(&err)) {
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        error_propagate(errp, err);
        return;
1063
    }
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1065
    bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1066
    bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
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    qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1069
}
1070

1071
/* throttling disk I/O limits */
1072 1073 1074
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)
1075 1076 1077 1078
{
    BlockIOLimit io_limits;
    BlockDriverState *bs;

1079
    bs = bdrv_find(device);
1080
    if (!bs) {
1081 1082
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1083 1084
    }

1085 1086 1087 1088 1089 1090
    io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
    io_limits.bps[BLOCK_IO_LIMIT_READ]  = bps_rd;
    io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr;
    io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops;
    io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd;
    io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr;
1091

1092
    if (!do_check_io_limits(&io_limits, errp)) {
1093
        return;
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
    }

    bs->io_limits = io_limits;

    if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
        bdrv_io_limits_enable(bs);
    } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
        bdrv_io_limits_disable(bs);
    } else {
        if (bs->block_timer) {
            qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock));
        }
    }
}

1109 1110 1111 1112 1113 1114 1115 1116 1117 1118
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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    if (bdrv_in_use(bs)) {
        qerror_report(QERR_DEVICE_IN_USE, id);
        return -1;
    }
1123 1124

    /* quiesce block driver; prevent further io */
1125
    bdrv_drain_all();
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    bdrv_flush(bs);
    bdrv_close(bs);

1129
    /* if we have a device attached to this BlockDriverState
1130 1131 1132 1133
     * 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.
     */
1134
    if (bdrv_get_attached_dev(bs)) {
1135 1136 1137
        bdrv_make_anon(bs);
    } else {
        drive_uninit(drive_get_by_blockdev(bs));
1138 1139 1140 1141
    }

    return 0;
}
1142

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void qmp_block_resize(const char *device, int64_t size, Error **errp)
1144 1145
{
    BlockDriverState *bs;
1146
    int ret;
1147 1148 1149

    bs = bdrv_find(device);
    if (!bs) {
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        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1152 1153 1154
    }

    if (size < 0) {
1155
        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
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        return;
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    }

1159 1160 1161
    /* complete all in-flight operations before resizing the device */
    bdrv_drain_all();

1162 1163
    ret = bdrv_truncate(bs, size);
    switch (ret) {
1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
    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:
1179
        error_setg_errno(errp, -ret, "Could not resize");
1180
        break;
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    }
}
1183

1184
static void block_job_cb(void *opaque, int ret)
1185 1186 1187 1188
{
    BlockDriverState *bs = opaque;
    QObject *obj;

1189
    trace_block_job_cb(bs, bs->job, ret);
1190 1191 1192 1193 1194 1195 1196 1197

    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)));
    }

1198 1199 1200 1201 1202
    if (block_job_is_cancelled(bs->job)) {
        monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
    } else {
        monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
    }
1203
    qobject_decref(obj);
1204 1205

    drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
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}

void qmp_block_stream(const char *device, bool has_base,
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                      const char *base, bool has_speed, int64_t speed,
                      bool has_on_error, BlockdevOnError on_error,
                      Error **errp)
1212 1213
{
    BlockDriverState *bs;
1214
    BlockDriverState *base_bs = NULL;
1215
    Error *local_err = NULL;
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1217 1218 1219 1220
    if (!has_on_error) {
        on_error = BLOCKDEV_ON_ERROR_REPORT;
    }

1221 1222 1223 1224 1225 1226 1227
    bs = bdrv_find(device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
    }

    if (base) {
1228 1229 1230 1231 1232
        base_bs = bdrv_find_backing_image(bs, base);
        if (base_bs == NULL) {
            error_set(errp, QERR_BASE_NOT_FOUND, base);
            return;
        }
1233 1234
    }

1235
    stream_start(bs, base_bs, base, has_speed ? speed : 0,
1236
                 on_error, block_job_cb, bs, &local_err);
1237 1238 1239
    if (error_is_set(&local_err)) {
        error_propagate(errp, local_err);
        return;
1240 1241
    }

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

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    trace_qmp_block_stream(bs, bs->job);
}
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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
     */
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    BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
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    /* 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;
    }

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    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;
    }

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    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));
}

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#define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)

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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,
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                      bool has_speed, int64_t speed,
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                      bool has_granularity, uint32_t granularity,
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                      bool has_buf_size, int64_t buf_size,
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                      bool has_on_source_error, BlockdevOnError on_source_error,
                      bool has_on_target_error, BlockdevOnErr