[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);
    }
}

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;
}

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,
                    const char *optstr)
{
    QemuOpts *opts;
    char buf[32];

    opts = drive_def(optstr);
    if (!opts) {
        return NULL;
    }
    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);
    }
    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;
}

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));
}

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)
{
    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;

    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;
        }
        bus_id = drive_index_to_bus_id(type, index);
        unit_id = drive_index_to_unit_id(type, index);
    }

    /* 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;
    }

    /*
     * catch multiple definitions
     */

    if (drive_get(type, bus_id, unit_id) != NULL) {
        error_report("drive with bus=%d, unit=%d (index=%d) exists",
                     bus_id, unit_id, index);
        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;
    default:
        abort();
    }
    if (!file || !*file) {
        return dinfo;
    }
    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;
    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
505a7fb1 MA	78	static int drive_index_to_bus_id(BlockInterfaceType type, int index)
	79	{
	80	int max_devs = if_max_devs[type];
	81	return max_devs ? index / max_devs : 0;
	82	}
	83
	84	static int drive_index_to_unit_id(BlockInterfaceType type, int index)
	85	{
	86	int max_devs = if_max_devs[type];
	87	return max_devs ? index % max_devs : index;
	88	}
	89
2292ddae MA	90	QemuOpts drive_def(const char optstr)
	91	{
	92	return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0);
	93	}
	94
	95	QemuOpts drive_add(BlockInterfaceType type, int index, const char file,
5645b0f4	96	const char *optstr)
666daa68	97	{
666daa68	98	QemuOpts *opts;
2292ddae	99	char buf[32];
666daa68	100
2292ddae	101	opts = drive_def(optstr);
666daa68 MA	102	if (!opts) {
	103	return NULL;
	104	}
2292ddae MA	105	if (type != IF_DEFAULT) {
	106	qemu_opt_set(opts, "if", if_name[type]);
	107	}
	108	if (index >= 0) {
	109	snprintf(buf, sizeof(buf), "%d", index);
	110	qemu_opt_set(opts, "index", buf);
	111	}
666daa68 MA	112	if (file)
	113	qemu_opt_set(opts, "file", file);
	114	return opts;
	115	}
	116
	117	DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
	118	{
	119	DriveInfo *dinfo;
	120
	121	/* seek interface, bus and unit */
	122
	123	QTAILQ_FOREACH(dinfo, &drives, next) {
	124	if (dinfo->type == type &&
	125	dinfo->bus == bus &&
	126	dinfo->unit == unit)
	127	return dinfo;
	128	}
	129
	130	return NULL;
	131	}
	132
f1bd51ac MA	133	DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
	134	{
	135	return drive_get(type,
	136	drive_index_to_bus_id(type, index),
	137	drive_index_to_unit_id(type, index));
	138	}
	139
666daa68 MA	140	int drive_get_max_bus(BlockInterfaceType type)
	141	{
	142	int max_bus;
	143	DriveInfo *dinfo;
	144
	145	max_bus = -1;
	146	QTAILQ_FOREACH(dinfo, &drives, next) {
	147	if(dinfo->type == type &&
	148	dinfo->bus > max_bus)
	149	max_bus = dinfo->bus;
	150	}
	151	return max_bus;
	152	}
	153
13839974 MA	154	/* Get a block device. This should only be used for single-drive devices
	155	(e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
	156	appropriate bus. */
	157	DriveInfo *drive_get_next(BlockInterfaceType type)
	158	{
	159	static int next_block_unit[IF_COUNT];
	160
	161	return drive_get(type, 0, next_block_unit[type]++);
	162	}
	163
e4700e59	164	DriveInfo drive_get_by_blockdev(BlockDriverState bs)
666daa68 MA	165	{
	166	DriveInfo *dinfo;
	167
	168	QTAILQ_FOREACH(dinfo, &drives, next) {
e4700e59 MA	169	if (dinfo->bdrv == bs) {
	170	return dinfo;
	171	}
666daa68	172	}
e4700e59	173	return NULL;
666daa68 MA	174	}
666daa68 MA	175
666daa68 MA	176	static void bdrv_format_print(void opaque, const char name)
666daa68 MA	177	{
807105a7	178	error_printf(" %s", name);
666daa68 MA	179	}
	180
	181	void drive_uninit(DriveInfo *dinfo)
	182	{
	183	qemu_opts_del(dinfo->opts);
	184	bdrv_delete(dinfo->bdrv);
	185	QTAILQ_REMOVE(&drives, dinfo, next);
	186	qemu_free(dinfo);
	187	}
	188
	189	static int parse_block_error_action(const char *buf, int is_read)
	190	{
	191	if (!strcmp(buf, "ignore")) {
	192	return BLOCK_ERR_IGNORE;
	193	} else if (!is_read && !strcmp(buf, "enospc")) {
	194	return BLOCK_ERR_STOP_ENOSPC;
	195	} else if (!strcmp(buf, "stop")) {
	196	return BLOCK_ERR_STOP_ANY;
	197	} else if (!strcmp(buf, "report")) {
	198	return BLOCK_ERR_REPORT;
	199	} else {
807105a7 MA	200	error_report("'%s' invalid %s error action",
807105a7 MA	201	buf, is_read ? "read" : "write");
666daa68 MA	202	return -1;
	203	}
	204	}
	205
319ae529	206	DriveInfo drive_init(QemuOpts opts, int default_to_scsi)
666daa68 MA	207	{
	208	const char *buf;
	209	const char *file = NULL;
	210	char devname[128];
	211	const char *serial;
	212	const char *mediastr = "";
	213	BlockInterfaceType type;
	214	enum { MEDIA_DISK, MEDIA_CDROM } media;
	215	int bus_id, unit_id;
	216	int cyls, heads, secs, translation;
	217	BlockDriver *drv = NULL;
	218	int max_devs;
	219	int index;
	220	int ro = 0;
	221	int bdrv_flags = 0;
	222	int on_read_error, on_write_error;
	223	const char *devaddr;
	224	DriveInfo *dinfo;
	225	int snapshot = 0;
	226	int ret;
	227
666daa68 MA	228	translation = BIOS_ATA_TRANSLATION_AUTO;
	229
	230	if (default_to_scsi) {
	231	type = IF_SCSI;
666daa68 MA	232	pstrcpy(devname, sizeof(devname), "scsi");
	233	} else {
	234	type = IF_IDE;
666daa68 MA	235	pstrcpy(devname, sizeof(devname), "ide");
	236	}
	237	media = MEDIA_DISK;
	238
	239	/* extract parameters */
	240	bus_id = qemu_opt_get_number(opts, "bus", 0);
	241	unit_id = qemu_opt_get_number(opts, "unit", -1);
	242	index = qemu_opt_get_number(opts, "index", -1);
	243
	244	cyls = qemu_opt_get_number(opts, "cyls", 0);
	245	heads = qemu_opt_get_number(opts, "heads", 0);
	246	secs = qemu_opt_get_number(opts, "secs", 0);
	247
	248	snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
	249	ro = qemu_opt_get_bool(opts, "readonly", 0);
	250
	251	file = qemu_opt_get(opts, "file");
	252	serial = qemu_opt_get(opts, "serial");
	253
	254	if ((buf = qemu_opt_get(opts, "if")) != NULL) {
	255	pstrcpy(devname, sizeof(devname), buf);
1960966d MA	256	for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++)
	257	;
	258	if (type == IF_COUNT) {
807105a7	259	error_report("unsupported bus type '%s'", buf);
666daa68 MA	260	return NULL;
	261	}
	262	}
1960966d	263	max_devs = if_max_devs[type];
666daa68 MA	264
	265	if (cyls \|\| heads \|\| secs) {
	266	if (cyls < 1 \|\| (type == IF_IDE && cyls > 16383)) {
807105a7	267	error_report("invalid physical cyls number");
666daa68 MA	268	return NULL;
	269	}
	270	if (heads < 1 \|\| (type == IF_IDE && heads > 16)) {
807105a7	271	error_report("invalid physical heads number");
666daa68 MA	272	return NULL;
	273	}
	274	if (secs < 1 \|\| (type == IF_IDE && secs > 63)) {
807105a7	275	error_report("invalid physical secs number");
666daa68 MA	276	return NULL;
	277	}
	278	}
	279
	280	if ((buf = qemu_opt_get(opts, "trans")) != NULL) {
	281	if (!cyls) {
807105a7 MA	282	error_report("'%s' trans must be used with cyls,heads and secs",
807105a7 MA	283	buf);
666daa68 MA	284	return NULL;
	285	}
	286	if (!strcmp(buf, "none"))
	287	translation = BIOS_ATA_TRANSLATION_NONE;
	288	else if (!strcmp(buf, "lba"))
	289	translation = BIOS_ATA_TRANSLATION_LBA;
	290	else if (!strcmp(buf, "auto"))
	291	translation = BIOS_ATA_TRANSLATION_AUTO;
	292	else {
807105a7	293	error_report("'%s' invalid translation type", buf);
666daa68 MA	294	return NULL;
	295	}
	296	}
	297
	298	if ((buf = qemu_opt_get(opts, "media")) != NULL) {
	299	if (!strcmp(buf, "disk")) {
	300	media = MEDIA_DISK;
	301	} else if (!strcmp(buf, "cdrom")) {
	302	if (cyls \|\| secs \|\| heads) {
807105a7	303	error_report("'%s' invalid physical CHS format", buf);
666daa68 MA	304	return NULL;
	305	}
	306	media = MEDIA_CDROM;
	307	} else {
807105a7	308	error_report("'%s' invalid media", buf);
666daa68 MA	309	return NULL;
	310	}
	311	}
	312
	313	if ((buf = qemu_opt_get(opts, "cache")) != NULL) {
	314	if (!strcmp(buf, "off") \|\| !strcmp(buf, "none")) {
	315	bdrv_flags \|= BDRV_O_NOCACHE;
	316	} else if (!strcmp(buf, "writeback")) {
	317	bdrv_flags \|= BDRV_O_CACHE_WB;
	318	} else if (!strcmp(buf, "unsafe")) {
	319	bdrv_flags \|= BDRV_O_CACHE_WB;
	320	bdrv_flags \|= BDRV_O_NO_FLUSH;
	321	} else if (!strcmp(buf, "writethrough")) {
	322	/* this is the default */
	323	} else {
807105a7	324	error_report("invalid cache option");
666daa68 MA	325	return NULL;
	326	}
	327	}
	328
	329	#ifdef CONFIG_LINUX_AIO
	330	if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
	331	if (!strcmp(buf, "native")) {
	332	bdrv_flags \|= BDRV_O_NATIVE_AIO;
	333	} else if (!strcmp(buf, "threads")) {
	334	/* this is the default */
	335	} else {
807105a7	336	error_report("invalid aio option");
666daa68 MA	337	return NULL;
	338	}
	339	}
	340	#endif
	341
	342	if ((buf = qemu_opt_get(opts, "format")) != NULL) {
	343	if (strcmp(buf, "?") == 0) {
807105a7 MA	344	error_printf("Supported formats:");
	345	bdrv_iterate_format(bdrv_format_print, NULL);
	346	error_printf("\n");
	347	return NULL;
666daa68 MA	348	}
	349	drv = bdrv_find_whitelisted_format(buf);
	350	if (!drv) {
807105a7	351	error_report("'%s' invalid format", buf);
666daa68 MA	352	return NULL;
	353	}
	354	}
	355
	356	on_write_error = BLOCK_ERR_STOP_ENOSPC;
	357	if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
	358	if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
807105a7	359	error_report("werror is not supported by this bus type");
666daa68 MA	360	return NULL;
	361	}
	362
	363	on_write_error = parse_block_error_action(buf, 0);
	364	if (on_write_error < 0) {
	365	return NULL;
	366	}
	367	}
	368
	369	on_read_error = BLOCK_ERR_REPORT;
	370	if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
5dba48a8	371	if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
807105a7	372	error_report("rerror is not supported by this bus type");
666daa68 MA	373	return NULL;
	374	}
	375
	376	on_read_error = parse_block_error_action(buf, 1);
	377	if (on_read_error < 0) {
	378	return NULL;
	379	}
	380	}
	381
	382	if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) {
	383	if (type != IF_VIRTIO) {
807105a7	384	error_report("addr is not supported by this bus type");
666daa68 MA	385	return NULL;
	386	}
	387	}
	388
	389	/* compute bus and unit according index */
	390
	391	if (index != -1) {
	392	if (bus_id != 0 \|\| unit_id != -1) {
807105a7	393	error_report("index cannot be used with bus and unit");
666daa68 MA	394	return NULL;
666daa68 MA	395	}
505a7fb1 MA	396	bus_id = drive_index_to_bus_id(type, index);
505a7fb1 MA	397	unit_id = drive_index_to_unit_id(type, index);
666daa68 MA	398	}
	399
	400	/* if user doesn't specify a unit_id,
	401	* try to find the first free
	402	*/
	403
	404	if (unit_id == -1) {
	405	unit_id = 0;
	406	while (drive_get(type, bus_id, unit_id) != NULL) {
	407	unit_id++;
	408	if (max_devs && unit_id >= max_devs) {
	409	unit_id -= max_devs;
	410	bus_id++;
	411	}
	412	}
	413	}
	414
	415	/* check unit id */
	416
	417	if (max_devs && unit_id >= max_devs) {
807105a7 MA	418	error_report("unit %d too big (max is %d)",
807105a7 MA	419	unit_id, max_devs - 1);
666daa68 MA	420	return NULL;
	421	}
	422
	423	/*
4e5d9b57	424	* catch multiple definitions
666daa68 MA	425	*/
	426
	427	if (drive_get(type, bus_id, unit_id) != NULL) {
4e5d9b57 MA	428	error_report("drive with bus=%d, unit=%d (index=%d) exists",
4e5d9b57 MA	429	bus_id, unit_id, index);
666daa68 MA	430	return NULL;
	431	}
	432
	433	/* init */
	434
	435	dinfo = qemu_mallocz(sizeof(*dinfo));
	436	if ((buf = qemu_opts_id(opts)) != NULL) {
	437	dinfo->id = qemu_strdup(buf);
	438	} else {
	439	/* no id supplied -> create one */
	440	dinfo->id = qemu_mallocz(32);
	441	if (type == IF_IDE \|\| type == IF_SCSI)
	442	mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
	443	if (max_devs)
	444	snprintf(dinfo->id, 32, "%s%i%s%i",
	445	devname, bus_id, mediastr, unit_id);
	446	else
	447	snprintf(dinfo->id, 32, "%s%s%i",
	448	devname, mediastr, unit_id);
	449	}
	450	dinfo->bdrv = bdrv_new(dinfo->id);
	451	dinfo->devaddr = devaddr;
	452	dinfo->type = type;
	453	dinfo->bus = bus_id;
	454	dinfo->unit = unit_id;
666daa68 MA	455	dinfo->opts = opts;
666daa68 MA	456	if (serial)
653dbec7	457	strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
666daa68 MA	458	QTAILQ_INSERT_TAIL(&drives, dinfo, next);
666daa68 MA	459
abd7f68d MA	460	bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
abd7f68d MA	461
666daa68 MA	462	switch(type) {
	463	case IF_IDE:
	464	case IF_SCSI:
	465	case IF_XEN:
	466	case IF_NONE:
	467	switch(media) {
	468	case MEDIA_DISK:
	469	if (cyls != 0) {
	470	bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs);
	471	bdrv_set_translation_hint(dinfo->bdrv, translation);
	472	}
	473	break;
	474	case MEDIA_CDROM:
	475	bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_CDROM);
	476	break;
	477	}
	478	break;
	479	case IF_SD:
	480	/* FIXME: This isn't really a floppy, but it's a reasonable
	481	approximation. */
	482	case IF_FLOPPY:
	483	bdrv_set_type_hint(dinfo->bdrv, BDRV_TYPE_FLOPPY);
	484	break;
	485	case IF_PFLASH:
	486	case IF_MTD:
	487	break;
	488	case IF_VIRTIO:
	489	/* add virtio block device */
3329f07b	490	opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
666daa68 MA	491	qemu_opt_set(opts, "driver", "virtio-blk-pci");
	492	qemu_opt_set(opts, "drive", dinfo->id);
	493	if (devaddr)
	494	qemu_opt_set(opts, "addr", devaddr);
	495	break;
2292ddae	496	default:
666daa68 MA	497	abort();
666daa68 MA	498	}
dd5b0d71	499	if (!file \|\| !*file) {
319ae529	500	return dinfo;
666daa68 MA	501	}
	502	if (snapshot) {
	503	/* always use cache=unsafe with snapshot */
	504	bdrv_flags &= ~BDRV_O_CACHE_MASK;
	505	bdrv_flags \|= (BDRV_O_SNAPSHOT\|BDRV_O_CACHE_WB\|BDRV_O_NO_FLUSH);
	506	}
	507
	508	if (media == MEDIA_CDROM) {
	509	/* CDROM is fine for any interface, don't check. */
	510	ro = 1;
	511	} else if (ro == 1) {
	512	if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) {
807105a7	513	error_report("readonly not supported by this bus type");
666daa68 MA	514	return NULL;
	515	}
	516	}
	517
	518	bdrv_flags \|= ro ? 0 : BDRV_O_RDWR;
	519
	520	ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv);
	521	if (ret < 0) {
807105a7 MA	522	error_report("could not open disk image %s: %s",
807105a7 MA	523	file, strerror(-ret));
666daa68 MA	524	return NULL;
	525	}
	526
	527	if (bdrv_key_required(dinfo->bdrv))
	528	autostart = 0;
666daa68 MA	529	return dinfo;
	530	}
	531
	532	void do_commit(Monitor mon, const QDict qdict)
	533	{
666daa68	534	const char *device = qdict_get_str(qdict, "device");
6ab4b5ab	535	BlockDriverState *bs;
666daa68	536
6ab4b5ab MA	537	if (!strcmp(device, "all")) {
	538	bdrv_commit_all();
	539	} else {
	540	bs = bdrv_find(device);
ac59eb95 MA	541	if (!bs) {
	542	qerror_report(QERR_DEVICE_NOT_FOUND, device);
	543	return;
6ab4b5ab	544	}
ac59eb95	545	bdrv_commit(bs);
666daa68 MA	546	}
	547	}
	548
f8882568 JS	549	int do_snapshot_blkdev(Monitor mon, const QDict qdict, QObject **ret_data)
	550	{
	551	const char *device = qdict_get_str(qdict, "device");
	552	const char *filename = qdict_get_try_str(qdict, "snapshot_file");
	553	const char *format = qdict_get_try_str(qdict, "format");
	554	BlockDriverState *bs;
	555	BlockDriver drv, proto_drv;
	556	int ret = 0;
	557	int flags;
	558
c90f1b32 JS	559	if (!filename) {
	560	qerror_report(QERR_MISSING_PARAMETER, "snapshot_file");
	561	ret = -1;
	562	goto out;
	563	}
	564
f8882568 JS	565	bs = bdrv_find(device);
	566	if (!bs) {
	567	qerror_report(QERR_DEVICE_NOT_FOUND, device);
	568	ret = -1;
	569	goto out;
	570	}
	571
	572	if (!format) {
	573	format = "qcow2";
	574	}
	575
	576	drv = bdrv_find_format(format);
	577	if (!drv) {
	578	qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
	579	ret = -1;
	580	goto out;
	581	}
	582
	583	proto_drv = bdrv_find_protocol(filename);
	584	if (!proto_drv) {
	585	qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
	586	ret = -1;
	587	goto out;
	588	}
	589
	590	ret = bdrv_img_create(filename, format, bs->filename,
	591	bs->drv->format_name, NULL, -1, bs->open_flags);
	592	if (ret) {
	593	goto out;
	594	}
	595
	596	qemu_aio_flush();
	597	bdrv_flush(bs);
	598
	599	flags = bs->open_flags;
	600	bdrv_close(bs);
	601	ret = bdrv_open(bs, filename, flags, drv);
	602	/*
	603	* If reopening the image file we just created fails, we really
	604	* are in trouble :(
	605	*/
	606	if (ret != 0) {
	607	abort();
	608	}
	609	out:
	610	if (ret) {
	611	ret = -1;
	612	}
	613
	614	return ret;
	615	}
	616
666daa68 MA	617	static int eject_device(Monitor mon, BlockDriverState bs, int force)
666daa68 MA	618	{
3b5276b5 EH	619	if (!force) {
	620	if (!bdrv_is_removable(bs)) {
	621	qerror_report(QERR_DEVICE_NOT_REMOVABLE,
	622	bdrv_get_device_name(bs));
	623	return -1;
	624	}
	625	if (bdrv_is_locked(bs)) {
	626	qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
	627	return -1;
666daa68	628	}
666daa68	629	}
3b5276b5	630	bdrv_close(bs);
666daa68 MA	631	return 0;
	632	}
	633
	634	int do_eject(Monitor mon, const QDict qdict, QObject **ret_data)
	635	{
	636	BlockDriverState *bs;
eb159d13	637	int force = qdict_get_try_bool(qdict, "force", 0);
666daa68 MA	638	const char *filename = qdict_get_str(qdict, "device");
	639
	640	bs = bdrv_find(filename);
	641	if (!bs) {
	642	qerror_report(QERR_DEVICE_NOT_FOUND, filename);
	643	return -1;
	644	}
	645	return eject_device(mon, bs, force);
	646	}
	647
	648	int do_block_set_passwd(Monitor mon, const QDict qdict,
	649	QObject **ret_data)
	650	{
	651	BlockDriverState *bs;
	652	int err;
	653
	654	bs = bdrv_find(qdict_get_str(qdict, "device"));
	655	if (!bs) {
	656	qerror_report(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
	657	return -1;
	658	}
	659
	660	err = bdrv_set_key(bs, qdict_get_str(qdict, "password"));
	661	if (err == -EINVAL) {
	662	qerror_report(QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs));
	663	return -1;
	664	} else if (err < 0) {
	665	qerror_report(QERR_INVALID_PASSWORD);
	666	return -1;
	667	}
	668
	669	return 0;
	670	}
	671
	672	int do_change_block(Monitor mon, const char device,
	673	const char filename, const char fmt)
	674	{
	675	BlockDriverState *bs;
	676	BlockDriver *drv = NULL;
	677	int bdrv_flags;
	678
	679	bs = bdrv_find(device);
	680	if (!bs) {
	681	qerror_report(QERR_DEVICE_NOT_FOUND, device);
	682	return -1;
	683	}
	684	if (fmt) {
	685	drv = bdrv_find_whitelisted_format(fmt);
	686	if (!drv) {
	687	qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt);
	688	return -1;
	689	}
	690	}
	691	if (eject_device(mon, bs, 0) < 0) {
	692	return -1;
	693	}
528f7663	694	bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
199630b6	695	bdrv_flags \|= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
666daa68 MA	696	if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
	697	qerror_report(QERR_OPEN_FILE_FAILED, filename);
	698	return -1;
	699	}
	700	return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
	701	}
9063f814 RH	702
	703	int do_drive_del(Monitor mon, const QDict qdict, QObject **ret_data)
	704	{
	705	const char *id = qdict_get_str(qdict, "id");
	706	BlockDriverState *bs;
	707	BlockDriverState **ptr;
	708	Property *prop;
	709
	710	bs = bdrv_find(id);
	711	if (!bs) {
	712	qerror_report(QERR_DEVICE_NOT_FOUND, id);
	713	return -1;
	714	}
	715
	716	/* quiesce block driver; prevent further io */
	717	qemu_aio_flush();
	718	bdrv_flush(bs);
	719	bdrv_close(bs);
	720
	721	/* clean up guest state from pointing to host resource by
	722	* finding and removing DeviceState "drive" property */
850ec113 MA	723	if (bs->peer) {
	724	for (prop = bs->peer->info->props; prop && prop->name; prop++) {
	725	if (prop->info->type == PROP_TYPE_DRIVE) {
	726	ptr = qdev_get_prop_ptr(bs->peer, prop);
	727	if (*ptr == bs) {
	728	bdrv_detach(bs, bs->peer);
	729	*ptr = NULL;
	730	break;
	731	}
9063f814 RH	732	}
	733	}
	734	}
	735
	736	/* clean up host side */
	737	drive_uninit(drive_get_by_blockdev(bs));
	738
	739	return 0;
	740	}
6d4a2b3a CH	741
	742	/*
	743	* XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the
	744	* existing QERR_ macro mess is cleaned up. A good example for better
	745	* error reports can be found in the qemu-img resize code.
	746	*/
	747	int do_block_resize(Monitor mon, const QDict qdict, QObject **ret_data)
	748	{
	749	const char *device = qdict_get_str(qdict, "device");
	750	int64_t size = qdict_get_int(qdict, "size");
	751	BlockDriverState *bs;
	752
	753	bs = bdrv_find(device);
	754	if (!bs) {
	755	qerror_report(QERR_DEVICE_NOT_FOUND, device);
	756	return -1;
	757	}
	758
	759	if (size < 0) {
	760	qerror_report(QERR_UNDEFINED_ERROR);
	761	return -1;
	762	}
	763
	764	if (bdrv_truncate(bs, size)) {
	765	qerror_report(QERR_UNDEFINED_ERROR);
	766	return -1;
	767	}
	768
	769	return 0;
	770	}