[qemu.git] / blockdev.c

/*
 * 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.
 */

#include "block.h"
#include "blockdev.h"
#include "monitor.h"
#include "qerror.h"
#include "qemu-option.h"
#include "qemu-config.h"
#include "sysemu.h"
#include "hw/qdev.h"
#include "block_int.h"

static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);

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] = {
    /*
     * 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,
};

/*
 * 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);

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

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

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

QemuOpts *drive_add(const char *file, const char *fmt, ...)
{
    va_list ap;
    char optstr[1024];
    QemuOpts *opts;

    va_start(ap, fmt);
    vsnprintf(optstr, sizeof(optstr), fmt, ap);
    va_end(ap);

    opts = qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
    if (!opts) {
        return NULL;
    }
    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;
}

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;
}

/* 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]++);
}

DriveInfo *drive_get_by_blockdev(BlockDriverState *bs)
{
    DriveInfo *dinfo;

    QTAILQ_FOREACH(dinfo, &drives, next) {
        if (dinfo->bdrv == bs) {
            return dinfo;
        }
    }
    return NULL;
}

static void bdrv_format_print(void *opaque, const char *name)
{
    error_printf(" %s", name);
}

void drive_uninit(DriveInfo *dinfo)
{
    qemu_opts_del(dinfo->opts);
    bdrv_delete(dinfo->bdrv);
    QTAILQ_REMOVE(&drives, dinfo, next);
    qemu_free(dinfo);
}

static int parse_block_error_action(const char *buf, int is_read)
{
    if (!strcmp(buf, "ignore")) {
        return BLOCK_ERR_IGNORE;
    } else if (!is_read && !strcmp(buf, "enospc")) {
        return BLOCK_ERR_STOP_ENOSPC;
    } else if (!strcmp(buf, "stop")) {
        return BLOCK_ERR_STOP_ANY;
    } else if (!strcmp(buf, "report")) {
        return BLOCK_ERR_REPORT;
    } else {
        error_report("'%s' invalid %s error action",
                     buf, is_read ? "read" : "write");
        return -1;
    }
}

DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi, int *fatal_error)
{
    const char *buf;
    const char *file = NULL;
    char devname[128];
    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;
    int snapshot = 0;
    int ret;

    *fatal_error = 1;

    translation = BIOS_ATA_TRANSLATION_AUTO;

    if (default_to_scsi) {
        type = IF_SCSI;
        pstrcpy(devname, sizeof(devname), "scsi");
    } else {
        type = IF_IDE;
        pstrcpy(devname, sizeof(devname), "ide");
    }
    media = MEDIA_DISK;

    /* 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);

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

    if ((buf = qemu_opt_get(opts, "if")) != NULL) {
        pstrcpy(devname, sizeof(devname), buf);
        for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
            ;
        if (type == IF_COUNT) {
            error_report("unsupported bus type '%s'", buf);
            return NULL;
	}
    }
    max_devs = if_max_devs[type];

    if (cyls || heads || secs) {
        if (cyls < 1 || (type == IF_IDE && cyls > 16383)) {
            error_report("invalid physical cyls number");
	    return NULL;
	}
        if (heads < 1 || (type == IF_IDE && heads > 16)) {
            error_report("invalid physical heads number");
	    return NULL;
	}
        if (secs < 1 || (type == IF_IDE && secs > 63)) {
            error_report("invalid physical secs number");
	    return NULL;
	}
    }

    if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
        if (!cyls) {
            error_report("'%s' trans must be used with cyls,heads and secs",
                         buf);
            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 {
            error_report("'%s' invalid translation type", buf);
	    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) {
                error_report("'%s' invalid physical CHS format", buf);
	        return NULL;
            }
	    media = MEDIA_CDROM;
	} else {
	    error_report("'%s' invalid media", buf);
	    return NULL;
	}
    }

    if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
        if (!strcmp(buf, "off") || !strcmp(buf, "none")) {
            bdrv_flags |= BDRV_O_NOCACHE;
        } else if (!strcmp(buf, "writeback")) {
            bdrv_flags |= BDRV_O_CACHE_WB;
        } else if (!strcmp(buf, "unsafe")) {
            bdrv_flags |= BDRV_O_CACHE_WB;
            bdrv_flags |= BDRV_O_NO_FLUSH;
        } else if (!strcmp(buf, "writethrough")) {
            /* this is the default */
        } else {
           error_report("invalid cache option");
           return NULL;
        }
    }

#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 {
           error_report("invalid aio option");
           return NULL;
        }
    }
#endif

    if ((buf = qemu_opt_get(opts, "format")) != NULL) {
       if (strcmp(buf, "?") == 0) {
           error_printf("Supported formats:");
           bdrv_iterate_format(bdrv_format_print, NULL);
           error_printf("\n");
           return NULL;
        }
        drv = bdrv_find_whitelisted_format(buf);
        if (!drv) {
            error_report("'%s' invalid format", buf);
            return NULL;
        }
    }

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

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

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

    /* compute bus and unit according index */

    if (index != -1) {
        if (bus_id != 0 || unit_id != -1) {
            error_report("index cannot be used with bus and unit");
            return NULL;
        }
        if (max_devs == 0)
        {
            unit_id = index;
            bus_id = 0;
        } else {
            unit_id = index % max_devs;
            bus_id = index / max_devs;
        }
    }

    /* 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) {
        error_report("unit %d too big (max is %d)",
                     unit_id, max_devs - 1);
        return NULL;
    }

    /*
     * ignore multiple definitions
     */

    if (drive_get(type, bus_id, unit_id) != NULL) {
        *fatal_error = 0;
        return NULL;
    }

    /* init */

    dinfo = qemu_mallocz(sizeof(*dinfo));
    if ((buf = qemu_opts_id(opts)) != NULL) {
        dinfo->id = qemu_strdup(buf);
    } else {
        /* no id supplied -> create one */
        dinfo->id = qemu_mallocz(32);
        if (type == IF_IDE || type == IF_SCSI)
            mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
        if (max_devs)
            snprintf(dinfo->id, 32, "%s%i%s%i",
                     devname, bus_id, mediastr, unit_id);
        else
            snprintf(dinfo->id, 32, "%s%s%i",
                     devname, mediastr, unit_id);
    }
    dinfo->bdrv = bdrv_new(dinfo->id);
    dinfo->devaddr = devaddr;
    dinfo->type = type;
    dinfo->bus = bus_id;
    dinfo->unit = unit_id;
    dinfo->opts = opts;
    if (serial)
        strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
    QTAILQ_INSERT_TAIL(&drives, dinfo, next);

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

    switch(type) {
    case IF_IDE:
    case IF_SCSI:
    case IF_XEN:
    case IF_NONE:
        switch(media) {
	case MEDIA_DISK:
            if (cyls != 0) {
                bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
                bdrv_set_translation_hint(dinfo->bdrv, translation);
            }
	    break;
	case MEDIA_CDROM:
            bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_CDROM);
	    break;
	}
        break;
    case IF_SD:
        /* FIXME: This isn't really a floppy, but it's a reasonable
           approximation.  */
    case IF_FLOPPY:
        bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_FLOPPY);
        break;
    case IF_PFLASH:
    case IF_MTD:
        break;
    case IF_VIRTIO:
        /* add virtio block device */
        opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
        qemu_opt_set(opts, "driver", "virtio-blk-pci");
        qemu_opt_set(opts, "drive", dinfo->id);
        if (devaddr)
            qemu_opt_set(opts, "addr", devaddr);
        break;
    case IF_COUNT:
        abort();
    }
    if (!file || !*file) {
        *fatal_error = 0;
        return NULL;
    }
    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);
    }

    if (media == MEDIA_CDROM) {
        /* CDROM is fine for any interface, don't check.  */
        ro = 1;
    } else if (ro == 1) {
        if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
            error_report("readonly not supported by this bus type");
            return NULL;
        }
    }

    bdrv_flags |= ro ? 0 : BDRV_O_RDWR;

    ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
    if (ret < 0) {
        error_report("could not open disk image %s: %s",
                     file, strerror(-ret));
        return NULL;
    }

    if (bdrv_key_required(dinfo->bdrv))
        autostart = 0;
    *fatal_error = 0;
    return dinfo;
}

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

    if (!strcmp(device, "all")) {
        bdrv_commit_all();
    } else {
        bs = bdrv_find(device);
        if (!bs) {
            qerror_report(QERR_DEVICE_NOT_FOUND, device);
            return;
        }
        bdrv_commit(bs);
    }
}

int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
    const char *device = qdict_get_str(qdict, "device");
    const char *filename = qdict_get_try_str(qdict, "snapshot_file");
    const char *format = qdict_get_try_str(qdict, "format");
    BlockDriverState *bs;
    BlockDriver *drv, *proto_drv;
    int ret = 0;
    int flags;

    if (!filename) {
        qerror_report(QERR_MISSING_PARAMETER, "snapshot_file");
        ret = -1;
        goto out;
    }

    bs = bdrv_find(device);
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, device);
        ret = -1;
        goto out;
    }

    if (!format) {
        format = "qcow2";
    }

    drv = bdrv_find_format(format);
    if (!drv) {
        qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
        ret = -1;
        goto out;
    }

    proto_drv = bdrv_find_protocol(filename);
    if (!proto_drv) {
        qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
        ret = -1;
        goto out;
    }

    ret = bdrv_img_create(filename, format, bs->filename,
                          bs->drv->format_name, NULL, -1, bs->open_flags);
    if (ret) {
        goto out;
    }

    qemu_aio_flush();
    bdrv_flush(bs);

    flags = bs->open_flags;
    bdrv_close(bs);
    ret = bdrv_open(bs, filename, flags, drv);
    /*
     * If reopening the image file we just created fails, we really
     * are in trouble :(
     */
    if (ret != 0) {
        abort();
    }
out:
    if (ret) {
        ret = -1;
    }

    return ret;
}

static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
{
    if (!force) {
        if (!bdrv_is_removable(bs)) {
            qerror_report(QERR_DEVICE_NOT_REMOVABLE,
                           bdrv_get_device_name(bs));
            return -1;
        }
        if (bdrv_is_locked(bs)) {
            qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
            return -1;
        }
    }
    bdrv_close(bs);
    return 0;
}

int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
    BlockDriverState *bs;
    int force = qdict_get_try_bool(qdict, "force", 0);
    const char *filename = qdict_get_str(qdict, "device");

    bs = bdrv_find(filename);
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, filename);
        return -1;
    }
    return eject_device(mon, bs, force);
}

int do_block_set_passwd(Monitor *mon, const QDict *qdict,
                        QObject **ret_data)
{
    BlockDriverState *bs;
    int err;

    bs = bdrv_find(qdict_get_str(qdict, "device"));
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
        return -1;
    }

    err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
    if (err == -EINVAL) {
        qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
        return -1;
    } else if (err < 0) {
        qerror_report(QERR_INVALID_PASSWORD);
        return -1;
    }

    return 0;
}

int do_change_block(Monitor *mon, const char *device,
                    const char *filename, const char *fmt)
{
    BlockDriverState *bs;
    BlockDriver *drv = NULL;
    int bdrv_flags;

    bs = bdrv_find(device);
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, device);
        return -1;
    }
    if (fmt) {
        drv = bdrv_find_whitelisted_format(fmt);
        if (!drv) {
            qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
            return -1;
        }
    }
    if (eject_device(mon, bs, 0) < 0) {
        return -1;
    }
    bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
    bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
    if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
        qerror_report(QERR_OPEN_FILE_FAILED, filename);
        return -1;
    }
    return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
}

int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
    const char *id = qdict_get_str(qdict, "id");
    BlockDriverState *bs;
    BlockDriverState **ptr;
    Property *prop;

    bs = bdrv_find(id);
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, id);
        return -1;
    }

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

    /* clean up guest state from pointing to host resource by
     * finding and removing DeviceState "drive" property */
    if (bs->peer) {
        for (prop = bs->peer->info->props; prop && prop->name; prop++) {
            if (prop->info->type == PROP_TYPE_DRIVE) {
                ptr = qdev_get_prop_ptr(bs->peer, prop);
                if (*ptr == bs) {
                    bdrv_detach(bs, bs->peer);
                    *ptr = NULL;
                    break;
                }
            }
        }
    }

    /* clean up host side */
    drive_uninit(drive_get_by_blockdev(bs));

    return 0;
}

/*
 * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the
 * existing QERR_ macro mess is cleaned up.  A good example for better
 * error reports can be found in the qemu-img resize code.
 */
int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
    const char *device = qdict_get_str(qdict, "device");
    int64_t size = qdict_get_int(qdict, "size");
    BlockDriverState *bs;

    bs = bdrv_find(device);
    if (!bs) {
        qerror_report(QERR_DEVICE_NOT_FOUND, device);
        return -1;
    }

    if (size < 0) {
        qerror_report(QERR_UNDEFINED_ERROR);
        return -1;
    }

    if (bdrv_truncate(bs, size)) {
        qerror_report(QERR_UNDEFINED_ERROR);
        return -1;
    }

    return 0;
}
Commit	Line	Data
666daa68 MA	1	/*
	2	* QEMU host block devices
	3	*
	4	* Copyright (c) 2003-2008 Fabrice Bellard
	5	*
	6	* This work is licensed under the terms of the GNU GPL, version 2 or
	7	* later. See the COPYING file in the top-level directory.
	8	*/
	9
	10	#include "block.h"
	11	#include "blockdev.h"
	12	#include "monitor.h"
	13	#include "qerror.h"
	14	#include "qemu-option.h"
	15	#include "qemu-config.h"
	16	#include "sysemu.h"
9063f814 RH	17	#include "hw/qdev.h"
9063f814 RH	18	#include "block_int.h"
666daa68	19
c9b62a7e	20	static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives);
666daa68	21
1960966d MA	22	static const char *const if_name[IF_COUNT] = {
	23	[IF_NONE] = "none",
	24	[IF_IDE] = "ide",
	25	[IF_SCSI] = "scsi",
	26	[IF_FLOPPY] = "floppy",
	27	[IF_PFLASH] = "pflash",
	28	[IF_MTD] = "mtd",
	29	[IF_SD] = "sd",
	30	[IF_VIRTIO] = "virtio",
	31	[IF_XEN] = "xen",
	32	};
	33
	34	static const int if_max_devs[IF_COUNT] = {
27d6bf40 MA	35	/*
	36	* Do not change these numbers! They govern how drive option
	37	* index maps to unit and bus. That mapping is ABI.
	38	*
	39	* All controllers used to imlement if=T drives need to support
	40	* if_max_devs[T] units, for any T with if_max_devs[T] != 0.
	41	* Otherwise, some index values map to "impossible" bus, unit
	42	* values.
	43	*
	44	* For instance, if you change [IF_SCSI] to 255, -drive
	45	* if=scsi,index=12 no longer means bus=1,unit=5, but
	46	* bus=0,unit=12. With an lsi53c895a controller (7 units max),
	47	* the drive can't be set up. Regression.
	48	*/
	49	[IF_IDE] = 2,
	50	[IF_SCSI] = 7,
1960966d MA	51	};
1960966d MA	52
14bafc54 MA	53	/*
	54	* We automatically delete the drive when a device using it gets
	55	* unplugged. Questionable feature, but we can't just drop it.
	56	* Device models call blockdev_mark_auto_del() to schedule the
	57	* automatic deletion, and generic qdev code calls blockdev_auto_del()
	58	* when deletion is actually safe.
	59	*/
	60	void blockdev_mark_auto_del(BlockDriverState *bs)
	61	{
	62	DriveInfo *dinfo = drive_get_by_blockdev(bs);
	63
0fc0f1fa RH	64	if (dinfo) {
	65	dinfo->auto_del = 1;
	66	}
14bafc54 MA	67	}
	68
	69	void blockdev_auto_del(BlockDriverState *bs)
	70	{
	71	DriveInfo *dinfo = drive_get_by_blockdev(bs);
	72
0fc0f1fa	73	if (dinfo && dinfo->auto_del) {
14bafc54 MA	74	drive_uninit(dinfo);
	75	}
	76	}
	77
666daa68 MA	78	QemuOpts drive_add(const char file, const char *fmt, ...)
	79	{
	80	va_list ap;
	81	char optstr[1024];
	82	QemuOpts *opts;
	83
	84	va_start(ap, fmt);
	85	vsnprintf(optstr, sizeof(optstr), fmt, ap);
	86	va_end(ap);
	87
3329f07b	88	opts = qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
666daa68 MA	89	if (!opts) {
	90	return NULL;
	91	}
	92	if (file)
	93	qemu_opt_set(opts, "file", file);
	94	return opts;
	95	}
	96
	97	DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
	98	{
	99	DriveInfo *dinfo;
	100
	101	/* seek interface, bus and unit */
	102
	103	QTAILQ_FOREACH(dinfo, &drives, next) {
	104	if (dinfo->type == type &&
	105	dinfo->bus == bus &&
	106	dinfo->unit == unit)
	107	return dinfo;
	108	}
	109
	110	return NULL;
	111	}
	112
666daa68 MA	113	int drive_get_max_bus(BlockInterfaceType type)
	114	{
	115	int max_bus;
	116	DriveInfo *dinfo;
	117
	118	max_bus = -1;
	119	QTAILQ_FOREACH(dinfo, &drives, next) {
	120	if(dinfo->type == type &&
	121	dinfo->bus > max_bus)
	122	max_bus = dinfo->bus;
	123	}
	124	return max_bus;
	125	}
	126
13839974 MA	127	/* Get a block device. This should only be used for single-drive devices
	128	(e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
	129	appropriate bus. */
	130	DriveInfo *drive_get_next(BlockInterfaceType type)
	131	{
	132	static int next_block_unit[IF_COUNT];
	133
	134	return drive_get(type, 0, next_block_unit[type]++);
	135	}
	136
e4700e59	137	DriveInfo drive_get_by_blockdev(BlockDriverState bs)
666daa68 MA	138	{
	139	DriveInfo *dinfo;
	140
	141	QTAILQ_FOREACH(dinfo, &drives, next) {
e4700e59 MA	142	if (dinfo->bdrv == bs) {
	143	return dinfo;
	144	}
666daa68	145	}
e4700e59	146	return NULL;
666daa68 MA	147	}
666daa68 MA	148
666daa68 MA	149	static void bdrv_format_print(void opaque, const char name)
666daa68 MA	150	{
807105a7	151	error_printf(" %s", name);
666daa68 MA	152	}
	153
	154	void drive_uninit(DriveInfo *dinfo)
	155	{
	156	qemu_opts_del(dinfo->opts);
	157	bdrv_delete(dinfo->bdrv);
	158	QTAILQ_REMOVE(&drives, dinfo, next);
	159	qemu_free(dinfo);
	160	}
	161
	162	static int parse_block_error_action(const char *buf, int is_read)
	163	{
	164	if (!strcmp(buf, "ignore")) {
	165	return BLOCK_ERR_IGNORE;
	166	} else if (!is_read && !strcmp(buf, "enospc")) {
	167	return BLOCK_ERR_STOP_ENOSPC;
	168	} else if (!strcmp(buf, "stop")) {
	169	return BLOCK_ERR_STOP_ANY;
	170	} else if (!strcmp(buf, "report")) {
	171	return BLOCK_ERR_REPORT;
	172	} else {
807105a7 MA	173	error_report("'%s' invalid %s error action",
807105a7 MA	174	buf, is_read ? "read" : "write");
666daa68 MA	175	return -1;
	176	}
	177	}
	178
	179	DriveInfo drive_init(QemuOpts opts, int default_to_scsi, int *fatal_error)
	180	{
	181	const char *buf;
	182	const char *file = NULL;
	183	char devname[128];
	184	const char *serial;
	185	const char *mediastr = "";
	186	BlockInterfaceType type;
	187	enum { MEDIA_DISK, MEDIA_CDROM } media;
	188	int bus_id, unit_id;
	189	int cyls, heads, secs, translation;
	190	BlockDriver *drv = NULL;
	191	int max_devs;
	192	int index;
	193	int ro = 0;
	194	int bdrv_flags = 0;
	195	int on_read_error, on_write_error;
	196	const char *devaddr;
	197	DriveInfo *dinfo;
	198	int snapshot = 0;
	199	int ret;
	200
	201	*fatal_error = 1;
	202
	203	translation = BIOS_ATA_TRANSLATION_AUTO;
	204
	205	if (default_to_scsi) {
	206	type = IF_SCSI;
666daa68 MA	207	pstrcpy(devname, sizeof(devname), "scsi");
	208	} else {
	209	type = IF_IDE;
666daa68 MA	210	pstrcpy(devname, sizeof(devname), "ide");
	211	}
	212	media = MEDIA_DISK;
	213
	214	/* extract parameters */
	215	bus_id = qemu_opt_get_number(opts, "bus", 0);
	216	unit_id = qemu_opt_get_number(opts, "unit", -1);
	217	index = qemu_opt_get_number(opts, "index", -1);
	218
	219	cyls = qemu_opt_get_number(opts, "cyls", 0);
	220	heads = qemu_opt_get_number(opts, "heads", 0);
	221	secs = qemu_opt_get_number(opts, "secs", 0);
	222
	223	snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
	224	ro = qemu_opt_get_bool(opts, "readonly", 0);
	225
	226	file = qemu_opt_get(opts, "file");
	227	serial = qemu_opt_get(opts, "serial");
	228
	229	if ((buf = qemu_opt_get(opts, "if")) != NULL) {
	230	pstrcpy(devname, sizeof(devname), buf);
1960966d MA	231	for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
	232	;
	233	if (type == IF_COUNT) {
807105a7	234	error_report("unsupported bus type '%s'", buf);
666daa68 MA	235	return NULL;
	236	}
	237	}
1960966d	238	max_devs = if_max_devs[type];
666daa68 MA	239
	240	if (cyls \|\| heads \|\| secs) {
	241	if (cyls < 1 \|\| (type == IF_IDE && cyls > 16383)) {
807105a7	242	error_report("invalid physical cyls number");
666daa68 MA	243	return NULL;
	244	}
	245	if (heads < 1 \|\| (type == IF_IDE && heads > 16)) {
807105a7	246	error_report("invalid physical heads number");
666daa68 MA	247	return NULL;
	248	}
	249	if (secs < 1 \|\| (type == IF_IDE && secs > 63)) {
807105a7	250	error_report("invalid physical secs number");
666daa68 MA	251	return NULL;
	252	}
	253	}
	254
	255	if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
	256	if (!cyls) {
807105a7 MA	257	error_report("'%s' trans must be used with cyls,heads and secs",
807105a7 MA	258	buf);
666daa68 MA	259	return NULL;
	260	}
	261	if (!strcmp(buf, "none"))
	262	translation = BIOS_ATA_TRANSLATION_NONE;
	263	else if (!strcmp(buf, "lba"))
	264	translation = BIOS_ATA_TRANSLATION_LBA;
	265	else if (!strcmp(buf, "auto"))
	266	translation = BIOS_ATA_TRANSLATION_AUTO;
	267	else {
807105a7	268	error_report("'%s' invalid translation type", buf);
666daa68 MA	269	return NULL;
	270	}
	271	}
	272
	273	if ((buf = qemu_opt_get(opts, "media")) != NULL) {
	274	if (!strcmp(buf, "disk")) {
	275	media = MEDIA_DISK;
	276	} else if (!strcmp(buf, "cdrom")) {
	277	if (cyls \|\| secs \|\| heads) {
807105a7	278	error_report("'%s' invalid physical CHS format", buf);
666daa68 MA	279	return NULL;
	280	}
	281	media = MEDIA_CDROM;
	282	} else {
807105a7	283	error_report("'%s' invalid media", buf);
666daa68 MA	284	return NULL;
	285	}
	286	}
	287
	288	if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
	289	if (!strcmp(buf, "off") \|\| !strcmp(buf, "none")) {
	290	bdrv_flags \|= BDRV_O_NOCACHE;
	291	} else if (!strcmp(buf, "writeback")) {
	292	bdrv_flags \|= BDRV_O_CACHE_WB;
	293	} else if (!strcmp(buf, "unsafe")) {
	294	bdrv_flags \|= BDRV_O_CACHE_WB;
	295	bdrv_flags \|= BDRV_O_NO_FLUSH;
	296	} else if (!strcmp(buf, "writethrough")) {
	297	/* this is the default */
	298	} else {
807105a7	299	error_report("invalid cache option");
666daa68 MA	300	return NULL;
	301	}
	302	}
	303
	304	#ifdef CONFIG_LINUX_AIO
	305	if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
	306	if (!strcmp(buf, "native")) {
	307	bdrv_flags \|= BDRV_O_NATIVE_AIO;
	308	} else if (!strcmp(buf, "threads")) {
	309	/* this is the default */
	310	} else {
807105a7	311	error_report("invalid aio option");
666daa68 MA	312	return NULL;
	313	}
	314	}
	315	#endif
	316
	317	if ((buf = qemu_opt_get(opts, "format")) != NULL) {
	318	if (strcmp(buf, "?") == 0) {
807105a7 MA	319	error_printf("Supported formats:");
	320	bdrv_iterate_format(bdrv_format_print, NULL);
	321	error_printf("\n");
	322	return NULL;
666daa68 MA	323	}
	324	drv = bdrv_find_whitelisted_format(buf);
	325	if (!drv) {
807105a7	326	error_report("'%s' invalid format", buf);
666daa68 MA	327	return NULL;
	328	}
	329	}
	330
	331	on_write_error = BLOCK_ERR_STOP_ENOSPC;
	332	if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
	333	if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
807105a7	334	error_report("werror is not supported by this bus type");
666daa68 MA	335	return NULL;
	336	}
	337
	338	on_write_error = parse_block_error_action(buf, 0);
	339	if (on_write_error < 0) {
	340	return NULL;
	341	}
	342	}
	343
	344	on_read_error = BLOCK_ERR_REPORT;
	345	if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
5dba48a8	346	if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
807105a7	347	error_report("rerror is not supported by this bus type");
666daa68 MA	348	return NULL;
	349	}
	350
	351	on_read_error = parse_block_error_action(buf, 1);
	352	if (on_read_error < 0) {
	353	return NULL;
	354	}
	355	}
	356
	357	if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
	358	if (type != IF_VIRTIO) {
807105a7	359	error_report("addr is not supported by this bus type");
666daa68 MA	360	return NULL;
	361	}
	362	}
	363
	364	/* compute bus and unit according index */
	365
	366	if (index != -1) {
	367	if (bus_id != 0 \|\| unit_id != -1) {
807105a7	368	error_report("index cannot be used with bus and unit");
666daa68 MA	369	return NULL;
	370	}
	371	if (max_devs == 0)
	372	{
	373	unit_id = index;
	374	bus_id = 0;
	375	} else {
	376	unit_id = index % max_devs;
	377	bus_id = index / max_devs;
	378	}
	379	}
	380
	381	/* if user doesn't specify a unit_id,
	382	* try to find the first free
	383	*/
	384
	385	if (unit_id == -1) {
	386	unit_id = 0;
	387	while (drive_get(type, bus_id, unit_id) != NULL) {
	388	unit_id++;
	389	if (max_devs && unit_id >= max_devs) {
	390	unit_id -= max_devs;
	391	bus_id++;
	392	}
	393	}
	394	}
	395
	396	/* check unit id */
	397
	398	if (max_devs && unit_id >= max_devs) {
807105a7 MA	399	error_report("unit %d too big (max is %d)",
807105a7 MA	400	unit_id, max_devs - 1);
666daa68 MA	401	return NULL;
	402	}
	403
	404	/*
	405	* ignore multiple definitions
	406	*/
	407
	408	if (drive_get(type, bus_id, unit_id) != NULL) {
	409	*fatal_error = 0;
	410	return NULL;
	411	}
	412
	413	/* init */
	414
	415	dinfo = qemu_mallocz(sizeof(*dinfo));
	416	if ((buf = qemu_opts_id(opts)) != NULL) {
	417	dinfo->id = qemu_strdup(buf);
	418	} else {
	419	/* no id supplied -> create one */
	420	dinfo->id = qemu_mallocz(32);
	421	if (type == IF_IDE \|\| type == IF_SCSI)
	422	mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
	423	if (max_devs)
	424	snprintf(dinfo->id, 32, "%s%i%s%i",
	425	devname, bus_id, mediastr, unit_id);
	426	else
	427	snprintf(dinfo->id, 32, "%s%s%i",
	428	devname, mediastr, unit_id);
	429	}
	430	dinfo->bdrv = bdrv_new(dinfo->id);
	431	dinfo->devaddr = devaddr;
	432	dinfo->type = type;
	433	dinfo->bus = bus_id;
	434	dinfo->unit = unit_id;
666daa68 MA	435	dinfo->opts = opts;
666daa68 MA	436	if (serial)
653dbec7	437	strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
666daa68 MA	438	QTAILQ_INSERT_TAIL(&drives, dinfo, next);
666daa68 MA	439
abd7f68d MA	440	bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
abd7f68d MA	441
666daa68 MA	442	switch(type) {
	443	case IF_IDE:
	444	case IF_SCSI:
	445	case IF_XEN:
	446	case IF_NONE:
	447	switch(media) {
	448	case MEDIA_DISK:
	449	if (cyls != 0) {
	450	bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
	451	bdrv_set_translation_hint(dinfo->bdrv, translation);
	452	}
	453	break;
	454	case MEDIA_CDROM:
	455	bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_CDROM);
	456	break;
	457	}
	458	break;
	459	case IF_SD:
	460	/* FIXME: This isn't really a floppy, but it's a reasonable
	461	approximation. */
	462	case IF_FLOPPY:
	463	bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_FLOPPY);
	464	break;
	465	case IF_PFLASH:
	466	case IF_MTD:
	467	break;
	468	case IF_VIRTIO:
	469	/* add virtio block device */
3329f07b	470	opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
666daa68 MA	471	qemu_opt_set(opts, "driver", "virtio-blk-pci");
	472	qemu_opt_set(opts, "drive", dinfo->id);
	473	if (devaddr)
	474	qemu_opt_set(opts, "addr", devaddr);
	475	break;
	476	case IF_COUNT:
	477	abort();
	478	}
dd5b0d71	479	if (!file \|\| !*file) {
666daa68 MA	480	*fatal_error = 0;
	481	return NULL;
	482	}
	483	if (snapshot) {
	484	/* always use cache=unsafe with snapshot */
	485	bdrv_flags &= ~BDRV_O_CACHE_MASK;
	486	bdrv_flags \|= (BDRV_O_SNAPSHOT\|BDRV_O_CACHE_WB\|BDRV_O_NO_FLUSH);
	487	}
	488
	489	if (media == MEDIA_CDROM) {
	490	/* CDROM is fine for any interface, don't check. */
	491	ro = 1;
	492	} else if (ro == 1) {
	493	if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
807105a7	494	error_report("readonly not supported by this bus type");
666daa68 MA	495	return NULL;
	496	}
	497	}
	498
	499	bdrv_flags \|= ro ? 0 : BDRV_O_RDWR;
	500
	501	ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
	502	if (ret < 0) {
807105a7 MA	503	error_report("could not open disk image %s: %s",
807105a7 MA	504	file, strerror(-ret));
666daa68 MA	505	return NULL;
	506	}
	507
	508	if (bdrv_key_required(dinfo->bdrv))
	509	autostart = 0;
	510	*fatal_error = 0;
	511	return dinfo;
	512	}
	513
	514	void do_commit(Monitor mon, const QDict qdict)
	515	{
666daa68	516	const char *device = qdict_get_str(qdict, "device");
6ab4b5ab	517	BlockDriverState *bs;
666daa68	518
6ab4b5ab MA	519	if (!strcmp(device, "all")) {
	520	bdrv_commit_all();
	521	} else {
	522	bs = bdrv_find(device);
ac59eb95 MA	523	if (!bs) {
	524	qerror_report(QERR_DEVICE_NOT_FOUND, device);
	525	return;
6ab4b5ab	526	}
ac59eb95	527	bdrv_commit(bs);
666daa68 MA	528	}
	529	}
	530
f8882568 JS	531	int do_snapshot_blkdev(Monitor mon, const QDict qdict, QObject **ret_data)
	532	{
	533	const char *device = qdict_get_str(qdict, "device");
	534	const char *filename = qdict_get_try_str(qdict, "snapshot_file");
	535	const char *format = qdict_get_try_str(qdict, "format");
	536	BlockDriverState *bs;
	537	BlockDriver drv, proto_drv;
	538	int ret = 0;
	539	int flags;
	540
c90f1b32 JS	541	if (!filename) {
	542	qerror_report(QERR_MISSING_PARAMETER, "snapshot_file");
	543	ret = -1;
	544	goto out;
	545	}
	546
f8882568 JS	547	bs = bdrv_find(device);
	548	if (!bs) {
	549	qerror_report(QERR_DEVICE_NOT_FOUND, device);
	550	ret = -1;
	551	goto out;
	552	}
	553
	554	if (!format) {
	555	format = "qcow2";
	556	}
	557
	558	drv = bdrv_find_format(format);
	559	if (!drv) {
	560	qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
	561	ret = -1;
	562	goto out;
	563	}
	564
	565	proto_drv = bdrv_find_protocol(filename);
	566	if (!proto_drv) {
	567	qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
	568	ret = -1;
	569	goto out;
	570	}
	571
	572	ret = bdrv_img_create(filename, format, bs->filename,
	573	bs->drv->format_name, NULL, -1, bs->open_flags);
	574	if (ret) {
	575	goto out;
	576	}
	577
	578	qemu_aio_flush();
	579	bdrv_flush(bs);
	580
	581	flags = bs->open_flags;
	582	bdrv_close(bs);
	583	ret = bdrv_open(bs, filename, flags, drv);
	584	/*
	585	* If reopening the image file we just created fails, we really
	586	* are in trouble :(
	587	*/
	588	if (ret != 0) {
	589	abort();
	590	}
	591	out:
	592	if (ret) {
	593	ret = -1;
	594	}
	595
	596	return ret;
	597	}
	598
666daa68 MA	599	static int eject_device(Monitor mon, BlockDriverState bs, int force)
666daa68 MA	600	{
3b5276b5 EH	601	if (!force) {
	602	if (!bdrv_is_removable(bs)) {
	603	qerror_report(QERR_DEVICE_NOT_REMOVABLE,
	604	bdrv_get_device_name(bs));
	605	return -1;
	606	}
	607	if (bdrv_is_locked(bs)) {
	608	qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
	609	return -1;
666daa68	610	}
666daa68	611	}
3b5276b5	612	bdrv_close(bs);
666daa68 MA	613	return 0;
	614	}
	615
	616	int do_eject(Monitor mon, const QDict qdict, QObject **ret_data)
	617	{
	618	BlockDriverState *bs;
eb159d13	619	int force = qdict_get_try_bool(qdict, "force", 0);
666daa68 MA	620	const char *filename = qdict_get_str(qdict, "device");
	621
	622	bs = bdrv_find(filename);
	623	if (!bs) {
	624	qerror_report(QERR_DEVICE_NOT_FOUND, filename);
	625	return -1;
	626	}
	627	return eject_device(mon, bs, force);
	628	}
	629
	630	int do_block_set_passwd(Monitor mon, const QDict qdict,
	631	QObject **ret_data)
	632	{
	633	BlockDriverState *bs;
	634	int err;
	635
	636	bs = bdrv_find(qdict_get_str(qdict, "device"));
	637	if (!bs) {
	638	qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
	639	return -1;
	640	}
	641
	642	err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
	643	if (err == -EINVAL) {
	644	qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
	645	return -1;
	646	} else if (err < 0) {
	647	qerror_report(QERR_INVALID_PASSWORD);
	648	return -1;
	649	}
	650
	651	return 0;
	652	}
	653
	654	int do_change_block(Monitor mon, const char device,
	655	const char filename, const char fmt)
	656	{
	657	BlockDriverState *bs;
	658	BlockDriver *drv = NULL;
	659	int bdrv_flags;
	660
	661	bs = bdrv_find(device);
	662	if (!bs) {
	663	qerror_report(QERR_DEVICE_NOT_FOUND, device);
	664	return -1;
	665	}
	666	if (fmt) {
	667	drv = bdrv_find_whitelisted_format(fmt);
	668	if (!drv) {
	669	qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
	670	return -1;
	671	}
	672	}
	673	if (eject_device(mon, bs, 0) < 0) {
	674	return -1;
	675	}
528f7663	676	bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
199630b6	677	bdrv_flags \|= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
666daa68 MA	678	if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
	679	qerror_report(QERR_OPEN_FILE_FAILED, filename);
	680	return -1;
	681	}
	682	return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
	683	}
9063f814 RH	684
	685	int do_drive_del(Monitor mon, const QDict qdict, QObject **ret_data)
	686	{
	687	const char *id = qdict_get_str(qdict, "id");
	688	BlockDriverState *bs;
	689	BlockDriverState **ptr;
	690	Property *prop;
	691
	692	bs = bdrv_find(id);
	693	if (!bs) {
	694	qerror_report(QERR_DEVICE_NOT_FOUND, id);
	695	return -1;
	696	}
	697
	698	/* quiesce block driver; prevent further io */
	699	qemu_aio_flush();
	700	bdrv_flush(bs);
	701	bdrv_close(bs);
	702
	703	/* clean up guest state from pointing to host resource by
	704	* finding and removing DeviceState "drive" property */
850ec113 MA	705	if (bs->peer) {
	706	for (prop = bs->peer->info->props; prop && prop->name; prop++) {
	707	if (prop->info->type == PROP_TYPE_DRIVE) {
	708	ptr = qdev_get_prop_ptr(bs->peer, prop);
	709	if (*ptr == bs) {
	710	bdrv_detach(bs, bs->peer);
	711	*ptr = NULL;
	712	break;
	713	}
9063f814 RH	714	}
	715	}
	716	}
	717
	718	/* clean up host side */
	719	drive_uninit(drive_get_by_blockdev(bs));
	720
	721	return 0;
	722	}
6d4a2b3a CH	723
	724	/*
	725	* XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the
	726	* existing QERR_ macro mess is cleaned up. A good example for better
	727	* error reports can be found in the qemu-img resize code.
	728	*/
	729	int do_block_resize(Monitor mon, const QDict qdict, QObject **ret_data)
	730	{
	731	const char *device = qdict_get_str(qdict, "device");
	732	int64_t size = qdict_get_int(qdict, "size");
	733	BlockDriverState *bs;
	734
	735	bs = bdrv_find(device);
	736	if (!bs) {
	737	qerror_report(QERR_DEVICE_NOT_FOUND, device);
	738	return -1;
	739	}
	740
	741	if (size < 0) {
	742	qerror_report(QERR_UNDEFINED_ERROR);
	743	return -1;
	744	}
	745
	746	if (bdrv_truncate(bs, size)) {
	747	qerror_report(QERR_UNDEFINED_ERROR);
	748	return -1;
	749	}
	750
	751	return 0;
	752	}