blockdev.c 53.1 KB
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/*
 * QEMU host block devices
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or
 * later.  See the COPYING file in the top-level directory.
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 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
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 */

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#include "sysemu/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;
    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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    bool has_driver_specific_opts;
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    translation = BIOS_ATA_TRANSLATION_AUTO;
    media = MEDIA_DISK;

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

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

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

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    has_driver_specific_opts = !!qdict_size(bs_opts);

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

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

    snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
    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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        }
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        qdict_put(bs_opts, "driver", qstring_from_str(buf));
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    }

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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 {
649
            qemu_opt_set(devopts, "driver", "virtio-blk-pci");
650
        }
651
        qemu_opt_set(devopts, "drive", dinfo->id);
652
        if (devaddr)
653
            qemu_opt_set(devopts, "addr", devaddr);
654
        break;
655
    }
656
    default:
657 658
        abort();
    }
659
    if (!file || !*file) {
660
        if (has_driver_specific_opts) {
661 662 663 664
            file = NULL;
        } else {
            return dinfo;
        }
665 666 667 668 669 670 671
    }
    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);
    }

672 673 674 675
    if (copy_on_read) {
        bdrv_flags |= BDRV_O_COPY_ON_READ;
    }

676 677 678 679
    if (runstate_check(RUN_STATE_INMIGRATE)) {
        bdrv_flags |= BDRV_O_INCOMING;
    }

680 681 682 683
    if (media == MEDIA_CDROM) {
        /* CDROM is fine for any interface, don't check.  */
        ro = 1;
    } else if (ro == 1) {
684 685
        if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY &&
            type != IF_NONE && type != IF_PFLASH) {
686
            error_report("readonly not supported by this bus type");
687
            goto err;
688 689 690 691 692
        }
    }

    bdrv_flags |= ro ? 0 : BDRV_O_RDWR;

693 694 695 696
    if (ro && copy_on_read) {
        error_report("warning: disabling copy_on_read on readonly drive");
    }

697 698
    QINCREF(bs_opts);
    ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, NULL);
699

700
    if (ret < 0) {
701 702
        if (ret == -EMEDIUMTYPE) {
            error_report("could not open disk image %s: not in %s format",
703
                         file ?: dinfo->id, qdict_get_str(bs_opts, "driver"));
704 705
        } else {
            error_report("could not open disk image %s: %s",
706
                         file ?: dinfo->id, strerror(-ret));
707
        }
708
        goto err;
709 710 711 712
    }

    if (bdrv_key_required(dinfo->bdrv))
        autostart = 0;
713

714
    QDECREF(bs_opts);
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
static void blockdev_do_action(int kind, void *data, Error **errp)
{
753 754
    TransactionAction action;
    TransactionActionList list;
755 756 757 758 759 760 761 762

    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
    BlockdevSnapshot snapshot = {
        .device = (char *) device,
        .snapshot_file = (char *) snapshot_file,
        .has_format = has_format,
        .format = (char *) format,
        .has_mode = has_mode,
        .mode = mode,
    };
776 777
    blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
                       &snapshot, errp);
778 779
}

780 781

/* New and old BlockDriverState structs for group snapshots */
782

783
typedef struct BlkTransactionState BlkTransactionState;
784 785 786 787 788 789 790

/* Only prepare() may fail. In a single transaction, only one of commit() or
   abort() will be called, clean() will always be called if it present. */
typedef struct BdrvActionOps {
    /* Size of state struct, in bytes. */
    size_t instance_size;
    /* Prepare the work, must NOT be NULL. */
791
    void (*prepare)(BlkTransactionState *common, Error **errp);
792
    /* Commit the changes, can be NULL. */
793
    void (*commit)(BlkTransactionState *common);
794
    /* Abort the changes on fail, can be NULL. */
795
    void (*abort)(BlkTransactionState *common);
796
    /* Clean up resource in the end, can be NULL. */
797
    void (*clean)(BlkTransactionState *common);
798 799 800 801 802 803 804
} BdrvActionOps;

/*
 * This structure must be arranged as first member in child type, assuming
 * that compiler will also arrange it to the same address with parent instance.
 * Later it will be used in free().
 */
805
struct BlkTransactionState {
806
    TransactionAction *action;
807
    const BdrvActionOps *ops;
808
    QSIMPLEQ_ENTRY(BlkTransactionState) entry;
809 810 811
};

/* external snapshot private data */
812 813
typedef struct ExternalSnapshotState {
    BlkTransactionState common;
814 815
    BlockDriverState *old_bs;
    BlockDriverState *new_bs;
816
} ExternalSnapshotState;
817

818
static void external_snapshot_prepare(BlkTransactionState *common,
819 820 821 822 823
                                      Error **errp)
{
    BlockDriver *drv;
    int flags, ret;
    Error *local_err = NULL;
824 825 826 827
    const char *device;
    const char *new_image_file;
    const char *format = "qcow2";
    enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
828 829
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
830
    TransactionAction *action = common->action;
831

832
    /* get parameters */
833
    g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
834 835 836 837 838 839 840 841 842 843 844

    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 */
845 846 847 848 849 850
    drv = bdrv_find_format(format);
    if (!drv) {
        error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
        return;
    }

851 852
    state->old_bs = bdrv_find(device);
    if (!state->old_bs) {
853 854 855 856
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
    }

857
    if (!bdrv_is_inserted(state->old_bs)) {
858 859 860 861
        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
        return;
    }

862
    if (bdrv_in_use(state->old_bs)) {
863 864 865 866
        error_set(errp, QERR_DEVICE_IN_USE, device);
        return;
    }

867 868
    if (!bdrv_is_read_only(state->old_bs)) {
        if (bdrv_flush(state->old_bs)) {
869 870 871 872 873
            error_set(errp, QERR_IO_ERROR);
            return;
        }
    }

874
    flags = state->old_bs->open_flags;
875 876 877 878

    /* create new image w/backing file */
    if (mode != NEW_IMAGE_MODE_EXISTING) {
        bdrv_img_create(new_image_file, format,
879 880
                        state->old_bs->filename,
                        state->old_bs->drv->format_name,
881 882 883 884 885 886 887 888
                        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 */
889
    state->new_bs = bdrv_new("");
890 891
    /* TODO Inherit bs->options or only take explicit options with an
     * extended QMP command? */
892
    ret = bdrv_open(state->new_bs, new_image_file, NULL,
893 894
                    flags | BDRV_O_NO_BACKING, drv);
    if (ret != 0) {
895
        error_setg_file_open(errp, -ret, new_image_file);
896 897 898
    }
}

899
static void external_snapshot_commit(BlkTransactionState *common)
900
{
901 902
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
903

904 905
    /* This removes our old bs and adds the new bs */
    bdrv_append(state->new_bs, state->old_bs);
906 907 908
    /* 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 */
909
    bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
910 911 912
                NULL);
}

913
static void external_snapshot_abort(BlkTransactionState *common)
914
{
915 916 917 918
    ExternalSnapshotState *state =
                             DO_UPCAST(ExternalSnapshotState, common, common);
    if (state->new_bs) {
        bdrv_delete(state->new_bs);
919 920 921
    }
}

922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938
typedef struct DriveBackupState {
    BlkTransactionState common;
    BlockDriverState *bs;
    BlockJob *job;
} DriveBackupState;

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

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

    qmp_drive_backup(backup->device, backup->target,
                     backup->has_format, backup->format,
939
                     backup->sync,
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966
                     backup->has_mode, backup->mode,
                     backup->has_speed, backup->speed,
                     backup->has_on_source_error, backup->on_source_error,
                     backup->has_on_target_error, backup->on_target_error,
                     &local_err);
    if (error_is_set(&local_err)) {
        error_propagate(errp, local_err);
        state->bs = NULL;
        state->job = NULL;
        return;
    }

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

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

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

967 968 969 970 971 972 973 974 975 976
static void abort_prepare(BlkTransactionState *common, Error **errp)
{
    error_setg(errp, "Transaction aborted using Abort action");
}

static void abort_commit(BlkTransactionState *common)
{
    assert(false); /* this action never succeeds */
}

977
static const BdrvActionOps actions[] = {
978
    [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = {
979
        .instance_size = sizeof(ExternalSnapshotState),
980 981 982 983
        .prepare  = external_snapshot_prepare,
        .commit   = external_snapshot_commit,
        .abort = external_snapshot_abort,
    },
984 985 986 987 988
    [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = {
        .instance_size = sizeof(DriveBackupState),
        .prepare = drive_backup_prepare,
        .abort = drive_backup_abort,
    },
989 990 991 992 993
    [TRANSACTION_ACTION_KIND_ABORT] = {
        .instance_size = sizeof(BlkTransactionState),
        .prepare = abort_prepare,
        .commit = abort_commit,
    },
994 995
};

996 997 998 999 1000
/*
 * '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
 */
1001
void qmp_transaction(TransactionActionList *dev_list, Error **errp)
1002
{
1003
    TransactionActionList *dev_entry = dev_list;
1004
    BlkTransactionState *state, *next;
1005
    Error *local_err = NULL;
1006

1007
    QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states;
1008 1009 1010 1011 1012 1013 1014
    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) {
1015
        TransactionAction *dev_info = NULL;
1016
        const BdrvActionOps *ops;
1017

1018 1019 1020
        dev_info = dev_entry->value;
        dev_entry = dev_entry->next;

1021 1022 1023
        assert(dev_info->kind < ARRAY_SIZE(actions));

        ops = &actions[dev_info->kind];
1024 1025 1026 1027
        state = g_malloc0(ops->instance_size);
        state->ops = ops;
        state->action = dev_info;
        QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
1028

1029
        state->ops->prepare(state, &local_err);
1030 1031 1032
        if (error_is_set(&local_err)) {
            error_propagate(errp, local_err);
            goto delete_and_fail;
1033 1034 1035
        }
    }

1036
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
1037 1038 1039
        if (state->ops->commit) {
            state->ops->commit(state);
        }
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
    }

    /* 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
    */
1050 1051 1052
    QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) {
        if (state->ops->abort) {
            state->ops->abort(state);
1053
        }
1054 1055
    }
exit:
1056 1057 1058
    QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) {
        if (state->ops->clean) {
            state->ops->clean(state);
1059
        }
1060
        g_free(state);
1061 1062 1063 1064
    }
}


1065
static void eject_device(BlockDriverState *bs, int force, Error **errp)
1066
{
1067 1068 1069 1070
    if (bdrv_in_use(bs)) {
        error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
        return;
    }
1071
    if (!bdrv_dev_has_removable_media(bs)) {
1072 1073
        error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs));
        return;
1074
    }
1075

P
Paolo Bonzini 已提交
1076 1077 1078
    if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) {
        bdrv_dev_eject_request(bs, force);
        if (!force) {
1079 1080
            error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
            return;
P
Paolo Bonzini 已提交
1081
        }
1082
    }
1083

1084
    bdrv_close(bs);
1085 1086
}

L
Luiz Capitulino 已提交
1087
void qmp_eject(const char *device, bool has_force, bool force, Error **errp)
1088 1089 1090
{
    BlockDriverState *bs;

L
Luiz Capitulino 已提交
1091
    bs = bdrv_find(device);
1092
    if (!bs) {
L
Luiz Capitulino 已提交
1093 1094
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1095 1096
    }

L
Luiz Capitulino 已提交
1097
    eject_device(bs, force, errp);
1098 1099
}

L
Luiz Capitulino 已提交
1100
void qmp_block_passwd(const char *device, const char *password, Error **errp)
1101 1102 1103 1104
{
    BlockDriverState *bs;
    int err;

L
Luiz Capitulino 已提交
1105
    bs = bdrv_find(device);
1106
    if (!bs) {
L
Luiz Capitulino 已提交
1107 1108
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1109 1110
    }

L
Luiz Capitulino 已提交
1111
    err = bdrv_set_key(bs, password);
1112
    if (err == -EINVAL) {
L
Luiz Capitulino 已提交
1113 1114
        error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
        return;
1115
    } else if (err < 0) {
L
Luiz Capitulino 已提交
1116 1117
        error_set(errp, QERR_INVALID_PASSWORD);
        return;
1118 1119 1120
    }
}

L
Luiz Capitulino 已提交
1121 1122 1123 1124
static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
                                    int bdrv_flags, BlockDriver *drv,
                                    const char *password, Error **errp)
{
1125 1126 1127 1128 1129
    int ret;

    ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv);
    if (ret < 0) {
        error_setg_file_open(errp, -ret, filename);
L
Luiz Capitulino 已提交
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148
        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)
1149 1150 1151 1152
{
    BlockDriverState *bs;
    BlockDriver *drv = NULL;
    int bdrv_flags;
1153
    Error *err = NULL;
1154 1155 1156

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

    if (format) {
1162
        drv = bdrv_find_whitelisted_format(format, bs->read_only);
1163
        if (!drv) {
L
Luiz Capitulino 已提交
1164 1165
            error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
            return;
1166 1167
        }
    }
L
Luiz Capitulino 已提交
1168

1169 1170
    eject_device(bs, 0, &err);
    if (error_is_set(&err)) {
L
Luiz Capitulino 已提交
1171 1172
        error_propagate(errp, err);
        return;
1173
    }
L
Luiz Capitulino 已提交
1174

1175
    bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
1176
    bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
L
Luiz Capitulino 已提交
1177 1178

    qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp);
1179
}
1180

Z
Zhi Yong Wu 已提交
1181
/* throttling disk I/O limits */
1182 1183 1184
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
1185 1186 1187 1188
{
    BlockIOLimit io_limits;
    BlockDriverState *bs;

1189
    bs = bdrv_find(device);
Z
Zhi Yong Wu 已提交
1190
    if (!bs) {
1191 1192
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
Z
Zhi Yong Wu 已提交
1193 1194
    }

1195 1196 1197 1198 1199 1200
    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
1201

1202
    if (!do_check_io_limits(&io_limits, errp)) {
1203
        return;
Z
Zhi Yong Wu 已提交
1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218
    }

    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));
        }
    }
}

1219 1220 1221 1222 1223 1224 1225 1226 1227 1228
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
1229 1230 1231 1232
    if (bdrv_in_use(bs)) {
        qerror_report(QERR_DEVICE_IN_USE, id);
        return -1;
    }
1233 1234

    /* quiesce block driver; prevent further io */
1235
    bdrv_drain_all();
1236 1237 1238
    bdrv_flush(bs);
    bdrv_close(bs);

1239
    /* if we have a device attached to this BlockDriverState
1240 1241 1242 1243
     * 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.
     */
1244
    if (bdrv_get_attached_dev(bs)) {
1245
        bdrv_make_anon(bs);
1246 1247 1248 1249

        /* Further I/O must not pause the guest */
        bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
                          BLOCKDEV_ON_ERROR_REPORT);
1250 1251
    } else {
        drive_uninit(drive_get_by_blockdev(bs));
1252 1253 1254 1255
    }

    return 0;
}
1256

L
Luiz Capitulino 已提交
1257
void qmp_block_resize(const char *device, int64_t size, Error **errp)
1258 1259
{
    BlockDriverState *bs;
1260
    int ret;
1261 1262 1263

    bs = bdrv_find(device);
    if (!bs) {
L
Luiz Capitulino 已提交
1264 1265
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
1266 1267 1268
    }

    if (size < 0) {
1269
        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
L
Luiz Capitulino 已提交
1270
        return;
1271 1272
    }

1273 1274 1275
    /* complete all in-flight operations before resizing the device */
    bdrv_drain_all();

1276 1277
    ret = bdrv_truncate(bs, size);
    switch (ret) {
1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
    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:
1293
        error_setg_errno(errp, -ret, "Could not resize");
1294
        break;
1295 1296
    }
}
S
Stefan Hajnoczi 已提交
1297

1298
static void block_job_cb(void *opaque, int ret)
S
Stefan Hajnoczi 已提交
1299 1300 1301 1302
{
    BlockDriverState *bs = opaque;
    QObject *obj;

1303
    trace_block_job_cb(bs, bs->job, ret);
S
Stefan Hajnoczi 已提交
1304 1305 1306 1307 1308 1309 1310 1311

    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)));
    }

1312 1313 1314 1315 1316
    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
1317
    qobject_decref(obj);
1318 1319

    drive_put_ref_bh_schedule(drive_get_by_blockdev(bs));
S
Stefan Hajnoczi 已提交
1320 1321 1322
}

void qmp_block_stream(const char *device, bool has_base,
P
Paolo Bonzini 已提交
1323 1324 1325
                      const char *base, bool has_speed, int64_t speed,
                      bool has_on_error, BlockdevOnError on_error,
                      Error **errp)
S
Stefan Hajnoczi 已提交
1326 1327
{
    BlockDriverState *bs;
1328
    BlockDriverState *base_bs = NULL;
1329
    Error *local_err = NULL;
S
Stefan Hajnoczi 已提交
1330

P
Paolo Bonzini 已提交
1331 1332 1333 1334
    if (!has_on_error) {
        on_error = BLOCKDEV_ON_ERROR_REPORT;
    }

S
Stefan Hajnoczi 已提交
1335 1336 1337 1338 1339 1340 1341
    bs = bdrv_find(device);
    if (!bs) {
        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
        return;
    }

    if (base) {
1342 1343 1344 1345 1346
        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
1347 1348
    }

1349
    stream_start(bs, base_bs, base, has_speed ? speed : 0,
P
Paolo Bonzini 已提交
1350
                 on_error, block_job_cb, bs, &local_err);
1351 1352 1353
    if (error_is_set(&local_err)) {
        error_propagate(errp, local_err);
        return;
S
Stefan Hajnoczi 已提交
1354 1355
    }

1356 1357 1358 1359 1360
    /* Grab a reference so hotplug does not delete the BlockDriverState from
     * underneath us.
     */
    drive_get_ref(drive_get_by_blockdev(bs));

S
Stefan Hajnoczi 已提交
1361 1362
    trace_qmp_block_stream(bs, bs->job);
}
1363

1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374
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
     */
1375
    BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT;
1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399

    /* 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;
    }

1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410
    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;
    }

1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
    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));
}

1423 1424
void qmp_drive_backup(const char *device, const char *target,
                      bool has_format, const char *format,
1425
                      enum MirrorSyncMode sync,
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439
                      bool has_mode, enum NewImageMode mode,
                      bool has_speed, int64_t speed,
                      bool has_on_source_error, BlockdevOnError on_source_error,
                      bool has_on_target_error, BlockdevOnError on_target_error,
                      Error **errp)
{
    BlockDriverState *bs;
    BlockDriverState *target_bs;
    BlockDriver *drv = NULL;
    Error *local_err = NULL;
    int flags;
    int64_t size;
    int ret;

1440 1441 1442 1443
    if (sync != MIRROR_SYNC_MODE_FULL) {
        error_setg(errp, "only sync mode 'full' is currently supported");
        return;
    }
1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 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 1520 1521 1522 1523 1524
    if (!has_speed) {
        speed = 0;
    }
    if (!has_on_source_error) {
        on_source_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_on_target_error) {
        on_target_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_mode) {
        mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
    }

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

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

    if (!has_format) {
        format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
    }
    if (format) {
        drv = bdrv_find_format(format);
        if (!drv) {
            error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
            return;
        }
    }

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

    flags = bs->open_flags | BDRV_O_RDWR;

    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
        return;
    }

    if (mode != NEW_IMAGE_MODE_EXISTING) {
        assert(format && drv);
        bdrv_img_create(target, format,
                        NULL, NULL, NULL, size, flags, &local_err, false);
    }

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

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

    backup_start(bs, target_bs, speed, on_source_error, on_target_error,
                 block_job_cb, bs, &local_err);
    if (local_err != NULL) {
        bdrv_delete(target_bs);
        error_propagate(errp, local_err);
        return;
    }

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

1525 1526
#define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)

P
Paolo Bonzini 已提交
1527 1528 1529 1530
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,
1531
                      bool has_speed, int64_t speed,
1532
                      bool has_granularity, uint32_t granularity,
1533
                      bool has_buf_size, int64_t buf_size,
1534 1535 1536
                      bool has_on_source_error, BlockdevOnError on_source_error,
                      bool has_on_target_error, BlockdevOnError on_target_error,
                      Error **errp)
P
Paolo Bonzini 已提交
1537 1538 1539 1540 1541 1542
{
    BlockDriverState *bs;
    BlockDriverState *source, *target_bs;
    BlockDriver *drv = NULL;
    Error *local_err = NULL;
    int flags;
1543
    int64_t size;
P
Paolo Bonzini 已提交
1544 1545 1546 1547 1548
    int ret;

    if (!has_speed) {
        speed = 0;
    }
1549 1550 1551 1552 1553 1554
    if (!has_on_source_error) {
        on_source_error = BLOCKDEV_ON_ERROR_REPORT;
    }
    if (!has_on_target_error) {
        on_target_error = BLOCKDEV_ON_ERROR_REPORT;
    }
P
Paolo Bonzini 已提交
1555 1556 1557
    if (!has_mode) {
        mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
    }
1558 1559 1560
    if (!has_granularity) {
        granularity = 0;
    }
1561 1562 1563 1564
    if (!has_buf_size) {
        buf_size = DEFAULT_MIRROR_BUF_SIZE;
    }

1565 1566 1567 1568 1569 1570 1571 1572
    if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
        error_set(errp, QERR_INVALID_PARAMETER, device);
        return;
    }
    if (granularity & (granularity - 1)) {
        error_set(errp, QERR_INVALID_PARAMETER, device);
        return;
    }
P
Paolo Bonzini 已提交
1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606

    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;
    }

1607 1608 1609 1610 1611 1612
    size = bdrv_getlength(bs);
    if (size < 0) {
        error_setg_errno(errp, -size, "bdrv_getlength failed");
        return;
    }

P
Paolo Bonzini 已提交
1613 1614 1615
    if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
        /* create new image w/o backing file */
        assert(format && drv);
1616
        bdrv_img_create(target, format,
1617
                        NULL, NULL, NULL, size, flags, &local_err, false);
P
Paolo Bonzini 已提交
1618 1619 1620 1621 1622 1623 1624
    } else {
        switch (mode) {
        case NEW_IMAGE_MODE_EXISTING:
            ret = 0;
            break;
        case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
            /* create new image with backing file */
1625 1626 1627
            bdrv_img_create(target, format,
                            source->filename,
                            source->drv->format_name,
1628
                            NULL, size, flags, &local_err, false);
P
Paolo Bonzini 已提交
1629 1630 1631 1632 1633 1634
            break;
        default:
            abort();
        }
    }

1635 1636
    if (error_is_set(&local_err)) {
        error_propagate(errp, local_err);
P
Paolo Bonzini 已提交
1637 1638 1639
        return;
    }

1640 1641 1642
    /* Mirroring takes care of copy-on-write using the source's backing
     * file.
     */
P
Paolo Bonzini 已提交
1643
    target_bs = bdrv_new("");
1644
    ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv);
P
Paolo Bonzini 已提交
1645 1646
    if (ret < 0) {
        bdrv_delete(target_bs);
1647
        error_setg_file_open(errp, -ret, target);
P
Paolo Bonzini 已提交
1648 1649 1650
        return;
    }

1651
    mirror_start(bs, target_bs, speed, granularity, buf_size, sync,
1652
                 on_source_error, on_target_error,
1653
                 block_job_cb, bs, &local_err);
P
Paolo Bonzini 已提交
1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665
    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));
}

1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676
static BlockJob *find_block_job(const char *device)
{
    BlockDriverState *bs;

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

1677
void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
1678 1679 1680 1681
{
    BlockJob *job = find_block_job(device);

    if (!job) {
1682
        error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1683 1684 1685
        return;
    }

1686
    block_job_set_speed(job, speed, errp);
1687
}
1688

1689 1690
void qmp_block_job_cancel(const char *device,
                          bool has_force, bool force, Error **errp)
1691 1692 1693
{
    BlockJob *job = find_block_job(device);

1694 1695 1696 1697
    if (!has_force) {
        force = false;
    }

1698
    if (!job) {
1699
        error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
1700 1701
        return;
    }
1702
    if (job->paused && !force) {
1703 1704 1705
        error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
        return;
    }
1706 1707 1708 1709

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

P
Paolo Bonzini 已提交
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749
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);
}

S
Stefan Hajnoczi 已提交
1750 1751 1752 1753 1754 1755
static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs)
{
    BlockJobInfoList **prev = opaque;
    BlockJob *job = bs->job;

    if (job) {
P
Paolo Bonzini 已提交
1756 1757
        BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1);
        elem->value = block_job_query(bs->job);
S
Stefan Hajnoczi 已提交
1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770
        (*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;
}
1771

1772
QemuOptsList qemu_common_drive_opts = {
1773
    .name = "drive",
1774
    .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819
    .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",
1820 1821 1822 1823
        },{
            .name = "discard",
            .type = QEMU_OPT_STRING,
            .help = "discard operation (ignore/off, unmap/on)",
1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892
        },{
            .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 */ }
    },
};
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QemuOptsList qemu_drive_opts = {
    .name = "drive",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
    .desc = {
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        /*
         * no elements => accept any params
         * validation will happen later
         */
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        { /* end of list */ }
    },
};