blockdev.c 50.2 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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Luiz Capitulino 已提交
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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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Kevin Wolf 已提交
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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 {
650
            qemu_opt_set(devopts, "driver", "virtio-blk-pci");
651
        }
652
        qemu_opt_set(devopts, "drive", dinfo->id);
653
        if (devaddr)
654
            qemu_opt_set(devopts, "addr", devaddr);
655
        break;
656
    }
657
    default:
658 659
        abort();
    }
660
    if (!file || !*file) {
661 662 663 664 665
        if (qdict_size(bs_opts)) {
            file = NULL;
        } else {
            return dinfo;
        }
666 667 668 669 670 671 672
    }
    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;
    }

677 678 679 680
    if (runstate_check(RUN_STATE_INMIGRATE)) {
        bdrv_flags |= BDRV_O_INCOMING;
    }

681 682 683 684
    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;
689 690 691 692 693
        }
    }

    bdrv_flags |= ro ? 0 : BDRV_O_RDWR;

694 695 696 697
    if (ro && copy_on_read) {
        error_report("warning: disabling copy_on_read on readonly drive");
    }

698 699 700
    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);
705 706
        } else {
            error_report("could not open disk image %s: %s",
707
                         file ?: dinfo->id, strerror(-ret));
708
        }
709
        goto err;
710 711 712 713
    }

    if (bdrv_key_required(dinfo->bdrv))
        autostart = 0;
714 715 716

    qemu_opts_del(opts);

717
    return dinfo;
718 719

err:
720 721
    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;
727 728 729 730 731
}

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();
737 738
    } 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);
744 745 746 747
    }
    if (ret < 0) {
        monitor_printf(mon, "'commit' error for '%s': %s\n", device,
                       strerror(-ret));
748 749 750
    }
}

751 752 753 754 755 756 757 758 759 760 761 762
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);
}

763 764
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
{
768 769 770 771 772 773 774 775 776 777
    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;
785 786
    QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
} BlkTransactionStates;
787

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;
800

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 */
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873
    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
/*
 * '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
 */
890
void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
891
{
892 893
    BlockdevActionList *dev_entry = dev_list;
    BlkTransactionStates *states, *next;
894
    Error *local_err = NULL;
895

896
    QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states;
897 898 899 900 901 902 903
    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) {
904 905
        BlockdevAction *dev_info = NULL;

906 907 908
        dev_info = dev_entry->value;
        dev_entry = dev_entry->next;

909
        states = g_malloc0(sizeof(BlkTransactionStates));
910 911
        QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry);

912 913
        switch (dev_info->kind) {
        case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
914
            external_snapshot_prepare(dev_info, states, errp);
915 916
            if (error_is_set(&local_err)) {
                error_propagate(errp, local_err);
917 918
                goto delete_and_fail;
            }
919 920 921
            break;
        default:
            abort();
922 923 924 925 926 927 928 929
        }

    }


    /* 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) {
930
        external_snapshot_commit(states);
931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
    }

    /* 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) {
        if (states->new_bs) {
             bdrv_delete(states->new_bs);
        }
    }
exit:
947
    QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
948 949 950 951 952
        g_free(states);
    }
}


953
static void eject_device(BlockDriverState *bs, int force, Error **errp)
954
{
955 956 957 958
    if (bdrv_in_use(bs)) {
        error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
        return;
    }
959
    if (!bdrv_dev_has_removable_media(bs)) {
960 961
        error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
        return;
962
    }
963

P
Paolo Bonzini 已提交
964 965 966
    if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
        bdrv_dev_eject_request(bs, force);
        if (!force) {
967 968
            error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
            return;
P
Paolo Bonzini 已提交
969
        }
970
    }
971

972
    bdrv_close(bs);
973 974
}

L
Luiz Capitulino 已提交
975
void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
976 977 978
{
    BlockDriverState *bs;

L
Luiz Capitulino 已提交
979
    bs = bdrv_find(device);
980
    if (!bs) {
L
Luiz Capitulino 已提交
981 982
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
983 984
    }

L
Luiz Capitulino 已提交
985
    eject_device(bs, force, errp);
986 987
}

L
Luiz Capitulino 已提交
988
void qmp_block_passwd(const char *device, const char *password, Error **errp)
989 990 991 992
{
    BlockDriverState *bs;
    int err;

L
Luiz Capitulino 已提交
993
    bs = bdrv_find(device);
994
    if (!bs) {
L
Luiz Capitulino 已提交
995 996
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
997 998
    }

L
Luiz Capitulino 已提交
999
    err = bdrv_set_key(bs, password);
1000
    if (err == -EINVAL) {
L
Luiz Capitulino 已提交
1001 1002
        error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
        return;
1003
    } else if (err < 0) {
L
Luiz Capitulino 已提交
1004 1005
        error_set(errp, QERR_INVALID_PASSWORD);
        return;
1006 1007 1008
    }
}

L
Luiz Capitulino 已提交
1009 1010 1011 1012
static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
                                    int bdrv_flags, BlockDriver *drv,
                                    const char *password, Error **errp)
{
1013
    if (bdrv_open(bs, filename, NULL, bdrv_flags, drv) < 0) {
L
Luiz Capitulino 已提交
1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
        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)
1034 1035 1036 1037
{
    BlockDriverState *bs;
    BlockDriver *drv = NULL;
    int bdrv_flags;
1038
    Error *err = NULL;
1039 1040 1041

    bs = bdrv_find(device);
    if (!bs) {
L
Luiz Capitulino 已提交
1042 1043
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1044
    }
L
Luiz Capitulino 已提交
1045 1046 1047

    if (format) {
        drv = bdrv_find_whitelisted_format(format);
1048
        if (!drv) {
L
Luiz Capitulino 已提交
1049 1050
            error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
            return;
1051 1052
        }
    }
L
Luiz Capitulino 已提交
1053

1054 1055
    eject_device(bs, 0, &err);
    if (error_is_set(&err)) {
L
Luiz Capitulino 已提交
1056 1057
        error_propagate(errp, err);
        return;
1058
    }
L
Luiz Capitulino 已提交
1059

1060
    bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1061
    bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
L
Luiz Capitulino 已提交
1062 1063

    qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1064
}
1065

Z
Zhi Yong Wu 已提交
1066
/* throttling disk I/O limits */
1067 1068 1069
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
1070 1071 1072 1073
{
    BlockIOLimit io_limits;
    BlockDriverState *bs;

1074
    bs = bdrv_find(device);
Z
Zhi Yong Wu 已提交
1075
    if (!bs) {
1076 1077
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
Z
Zhi Yong Wu 已提交
1078 1079
    }

1080 1081 1082 1083 1084 1085
    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;
Z
Zhi Yong Wu 已提交
1086

1087
    if (!do_check_io_limits(&io_limits, errp)) {
1088
        return;
Z
Zhi Yong Wu 已提交
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103
    }

    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));
        }
    }
}

1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
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;
    }
M
Marcelo Tosatti 已提交
1114 1115 1116 1117
    if (bdrv_in_use(bs)) {
        qerror_report(QERR_DEVICE_IN_USE, id);
        return -1;
    }
1118 1119

    /* quiesce block driver; prevent further io */
1120
    bdrv_drain_all();
1121 1122 1123
    bdrv_flush(bs);
    bdrv_close(bs);

1124
    /* if we have a device attached to this BlockDriverState
1125 1126 1127 1128
     * 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.
     */
1129
    if (bdrv_get_attached_dev(bs)) {
1130 1131 1132
        bdrv_make_anon(bs);
    } else {
        drive_uninit(drive_get_by_blockdev(bs));
1133 1134 1135 1136
    }

    return 0;
}
1137

L
Luiz Capitulino 已提交
1138
void qmp_block_resize(const char *device, int64_t size, Error **errp)
1139 1140
{
    BlockDriverState *bs;
1141
    int ret;
1142 1143 1144

    bs = bdrv_find(device);
    if (!bs) {
L
Luiz Capitulino 已提交
1145 1146
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1147 1148 1149
    }

    if (size < 0) {
1150
        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
L
Luiz Capitulino 已提交
1151
        return;
1152 1153
    }

1154 1155 1156
    /* complete all in-flight operations before resizing the device */
    bdrv_drain_all();

1157 1158
    ret = bdrv_truncate(bs, size);
    switch (ret) {
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173
    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:
1174
        error_setg_errno(errp, -ret, "Could not resize");
1175
        break;
1176 1177
    }
}
S
Stefan Hajnoczi 已提交
1178

1179
static void block_job_cb(void *opaque, int ret)
S
Stefan Hajnoczi 已提交
1180 1181 1182 1183
{
    BlockDriverState *bs = opaque;
    QObject *obj;

1184
    trace_block_job_cb(bs, bs->job, ret);
S
Stefan Hajnoczi 已提交
1185 1186 1187 1188 1189 1190 1191 1192

    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)));
    }

1193 1194 1195 1196 1197
    if (block_job_is_cancelled(bs->job)) {
        monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj);
    } else {
        monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj);
    }
S
Stefan Hajnoczi 已提交
1198
    qobject_decref(obj);
1199 1200

    drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
S
Stefan Hajnoczi 已提交
1201 1202 1203
}

void qmp_block_stream(const char *device, bool has_base,
P
Paolo Bonzini 已提交
1204 1205 1206
                      const char *base, bool has_speed, int64_t speed,
                      bool has_on_error, BlockdevOnError on_error,
                      Error **errp)
S
Stefan Hajnoczi 已提交
1207 1208
{
    BlockDriverState *bs;
1209
    BlockDriverState *base_bs = NULL;
1210
    Error *local_err = NULL;
S
Stefan Hajnoczi 已提交
1211

P
Paolo Bonzini 已提交
1212 1213 1214 1215
    if (!has_on_error) {
        on_error = BLOCKDEV_ON_ERROR_REPORT;
    }

S
Stefan Hajnoczi 已提交
1216 1217 1218 1219 1220 1221 1222
    bs = bdrv_find(device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
    }

    if (base) {
1223 1224 1225 1226 1227
        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
1228 1229
    }

1230
    stream_start(bs, base_bs, base, has_speed ? speed : 0,
P
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                 on_error, block_job_cb, bs, &local_err);
1232 1233 1234
    if (error_is_set(&local_err)) {
        error_propagate(errp, local_err);
        return;
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    }

1237 1238 1239 1240 1241
    /* 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);
}
1244

1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255
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
     */
1256
    BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280

    /* 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;
    }

1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291
    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;
    }

1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
    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));
}

1304 1305
#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,
1310
                      bool has_speed, int64_t speed,
1311
                      bool has_granularity, uint32_t granularity,
1312
                      bool has_buf_size, int64_t buf_size,
1313 1314 1315
                      bool has_on_source_error, BlockdevOnError on_source_error,
                      bool has_on_target_error, BlockdevOnError on_target_error,
                      Error **errp)
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{
    BlockDriverState *bs;
    BlockDriverState *source, *target_bs;
    BlockDriver *proto_drv;
    BlockDriver *drv = NULL;
    Error *local_err = NULL;
    int flags;
    uint64_t size;
    int ret;

    if (!has_speed) {
        speed = 0;
    }
1329 1330 1331 1332 1333 1334
    if (!has_on_source_error) {
        on_source_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_on_target_error) {
        on_target_error = BLOCKDEV_ON_ERROR_REPORT;
    }
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    if (!has_mode) {
        mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
    }
1338 1339 1340
    if (!has_granularity) {
        granularity = 0;
    }
1341 1342 1343 1344
    if (!has_buf_size) {
        buf_size = DEFAULT_MIRROR_BUF_SIZE;
    }

1345 1346 1347 1348 1349 1350 1351 1352
    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;
    }
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    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;
    }

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

1393 1394
    bdrv_get_geometry(bs, &size);
    size *= 512;
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    if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
        /* create new image w/o backing file */
        assert(format && drv);
1398
        bdrv_img_create(target, format,
1399
                        NULL, NULL, NULL, size, flags, &local_err, false);
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    } else {
        switch (mode) {
        case NEW_IMAGE_MODE_EXISTING:
            ret = 0;
            break;
        case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
            /* create new image with backing file */
1407 1408 1409
            bdrv_img_create(target, format,
                            source->filename,
                            source->drv->format_name,
1410
                            NULL, size, flags, &local_err, false);
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            break;
        default:
            abort();
        }
    }

1417 1418
    if (error_is_set(&local_err)) {
        error_propagate(errp, local_err);
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        return;
    }

1422 1423 1424
    /* Mirroring takes care of copy-on-write using the source's backing
     * file.
     */
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    target_bs = bdrv_new("");
1426
    ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv);
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    if (ret < 0) {
        bdrv_delete(target_bs);
        error_set(errp, QERR_OPEN_FILE_FAILED, target);
        return;
    }

1434
    mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1435
                 on_source_error, on_target_error,
1436
                 block_job_cb, bs, &local_err);
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    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));
}

1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
static BlockJob *find_block_job(const char *device)
{
    BlockDriverState *bs;

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

1460
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1461 1462 1463 1464
{
    BlockJob *job = find_block_job(device);

    if (!job) {
1465
        error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1466 1467 1468
        return;
    }

1469
    block_job_set_speed(job, speed, errp);
1470
}
1471

1472 1473
void qmp_block_job_cancel(const char *device,
                          bool has_force, bool force, Error **errp)
1474 1475 1476
{
    BlockJob *job = find_block_job(device);

1477 1478 1479 1480
    if (!has_force) {
        force = false;
    }

1481
    if (!job) {
1482
        error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1483 1484
        return;
    }
1485
    if (job->paused && !force) {
1486 1487 1488
        error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
        return;
    }
1489 1490 1491 1492

    trace_qmp_block_job_cancel(job);
    block_job_cancel(job);
}
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1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519
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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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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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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        BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
        elem->value = block_job_query(bs->job);
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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;
}
1554

1555
QemuOptsList qemu_common_drive_opts = {
1556
    .name = "drive",
1557
    .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602
    .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",
1603 1604 1605 1606
        },{
            .name = "discard",
            .type = QEMU_OPT_STRING,
            .help = "discard operation (ignore/off, unmap/on)",
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675
        },{
            .name = "cache",
            .type = QEMU_OPT_STRING,
            .help = "host cache usage (none, writeback, writethrough, "
                    "directsync, unsafe)",
        },{
            .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)",
        },{
            .name = "readonly",
            .type = QEMU_OPT_BOOL,
            .help = "open drive file as read-only",
        },{
            .name = "iops",
            .type = QEMU_OPT_NUMBER,
            .help = "limit total I/O operations per second",
        },{
            .name = "iops_rd",
            .type = QEMU_OPT_NUMBER,
            .help = "limit read operations per second",
        },{
            .name = "iops_wr",
            .type = QEMU_OPT_NUMBER,
            .help = "limit write operations per second",
        },{
            .name = "bps",
            .type = QEMU_OPT_NUMBER,
            .help = "limit total bytes per second",
        },{
            .name = "bps_rd",
            .type = QEMU_OPT_NUMBER,
            .help = "limit read bytes per second",
        },{
            .name = "bps_wr",
            .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 */ }
    },
};
1676 1677 1678 1679 1680

QemuOptsList qemu_drive_opts = {
    .name = "drive",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
    .desc = {
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794
        {
            .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",
        },{
            .name = "discard",
            .type = QEMU_OPT_STRING,
            .help = "discard operation (ignore/off, unmap/on)",
        },{
            .name = "cache",
            .type = QEMU_OPT_STRING,
            .help = "host cache usage (none, writeback, writethrough, "
                    "directsync, unsafe)",
        },{
            .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)",
        },{
            .name = "readonly",
            .type = QEMU_OPT_BOOL,
            .help = "open drive file as read-only",
        },{
            .name = "iops",
            .type = QEMU_OPT_NUMBER,
            .help = "limit total I/O operations per second",
        },{
            .name = "iops_rd",
            .type = QEMU_OPT_NUMBER,
            .help = "limit read operations per second",
        },{
            .name = "iops_wr",
            .type = QEMU_OPT_NUMBER,
            .help = "limit write operations per second",
        },{
            .name = "bps",
            .type = QEMU_OPT_NUMBER,
            .help = "limit total bytes per second",
        },{
            .name = "bps_rd",
            .type = QEMU_OPT_NUMBER,
            .help = "limit read bytes per second",
        },{
            .name = "bps_wr",
            .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)",
        },
1795 1796 1797
        { /* end of list */ }
    },
};