Archipelago » qemu

/* BlockDriver implementation for "raw"

 *

 * Copyright (C) 2010, 2013, Red Hat, Inc.

 * Copyright (C) 2010, Blue Swirl <blauwirbel@gmail.com>

 * Copyright (C) 2009, Anthony Liguori <aliguori@us.ibm.com>

 *

 * Author:

 *   Laszlo Ersek <lersek@redhat.com>

 *

 * 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.

 */

#include "block/block_int.h"

#include "qemu/option.h"

static QEMUOptionParameter raw_create_options[] = {

    {

        .name = BLOCK_OPT_SIZE,

        .type = OPT_SIZE,

        .help = "Virtual disk size"

    },

    { 0 }

};

static int raw_reopen_prepare(BDRVReopenState *reopen_state,

                              BlockReopenQueue *queue, Error **errp)

{

    return 0;

}

static int coroutine_fn raw_co_readv(BlockDriverState *bs, int64_t sector_num,

                                     int nb_sectors, QEMUIOVector *qiov)

{

    BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);

    return bdrv_co_readv(bs->file, sector_num, nb_sectors, qiov);

}

static int coroutine_fn raw_co_writev(BlockDriverState *bs, int64_t sector_num,

                                      int nb_sectors, QEMUIOVector *qiov)

{

    BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);

    return bdrv_co_writev(bs->file, sector_num, nb_sectors, qiov);

}

static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,

                                            int64_t sector_num,

                                            int nb_sectors, int *pnum)

{

    return bdrv_get_block_status(bs->file, sector_num, nb_sectors, pnum);

}

static int coroutine_fn raw_co_write_zeroes(BlockDriverState *bs,

                                            int64_t sector_num, int nb_sectors)

{

    return bdrv_co_write_zeroes(bs->file, sector_num, nb_sectors);

}

static int coroutine_fn raw_co_discard(BlockDriverState *bs,

                                       int64_t sector_num, int nb_sectors)

{

    return bdrv_co_discard(bs->file, sector_num, nb_sectors);

}

static int64_t raw_getlength(BlockDriverState *bs)

{

    return bdrv_getlength(bs->file);

}

static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)

{

    return bdrv_get_info(bs->file, bdi);

}

static int raw_truncate(BlockDriverState *bs, int64_t offset)

{

    return bdrv_truncate(bs->file, offset);

}

static int raw_is_inserted(BlockDriverState *bs)

{

    return bdrv_is_inserted(bs->file);

}

static int raw_media_changed(BlockDriverState *bs)

{

    return bdrv_media_changed(bs->file);

}

static void raw_eject(BlockDriverState *bs, bool eject_flag)

{

    bdrv_eject(bs->file, eject_flag);

}

static void raw_lock_medium(BlockDriverState *bs, bool locked)

{

    bdrv_lock_medium(bs->file, locked);

}

static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)

{

    return bdrv_ioctl(bs->file, req, buf);

}

static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,

                                       unsigned long int req, void *buf,

                                       BlockDriverCompletionFunc *cb,

                                       void *opaque)

{

    return bdrv_aio_ioctl(bs->file, req, buf, cb, opaque);

}

static int raw_has_zero_init(BlockDriverState *bs)

{

    return bdrv_has_zero_init(bs->file);

}

static int raw_create(const char *filename, QEMUOptionParameter *options,

                      Error **errp)

{

    Error *local_err = NULL;

    int ret;

    ret = bdrv_create_file(filename, options, &local_err);

    if (error_is_set(&local_err)) {

        qerror_report_err(local_err);

        error_free(local_err);

    }

    return ret;

}

static int raw_open(BlockDriverState *bs, QDict *options, int flags,

                    Error **errp)

{

    bs->sg = bs->file->sg;

    return 0;

}

static void raw_close(BlockDriverState *bs)

{

}

static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)

{

    /* smallest possible positive score so that raw is used if and only if no

     * other block driver works

     */

    return 1;

}

static BlockDriver bdrv_raw = {

    .format_name          = "raw",

    .bdrv_probe           = &raw_probe,

    .bdrv_reopen_prepare  = &raw_reopen_prepare,

    .bdrv_open            = &raw_open,

    .bdrv_close           = &raw_close,

    .bdrv_create          = &raw_create,

    .bdrv_co_readv        = &raw_co_readv,

    .bdrv_co_writev       = &raw_co_writev,

    .bdrv_co_write_zeroes = &raw_co_write_zeroes,

    .bdrv_co_discard      = &raw_co_discard,

    .bdrv_co_get_block_status = &raw_co_get_block_status,

    .bdrv_truncate        = &raw_truncate,

    .bdrv_getlength       = &raw_getlength,

    .bdrv_get_info        = &raw_get_info,

    .bdrv_is_inserted     = &raw_is_inserted,

    .bdrv_media_changed   = &raw_media_changed,

    .bdrv_eject           = &raw_eject,

    .bdrv_lock_medium     = &raw_lock_medium,

    .bdrv_ioctl           = &raw_ioctl,

    .bdrv_aio_ioctl       = &raw_aio_ioctl,

    .create_options       = &raw_create_options[0],

    .bdrv_has_zero_init   = &raw_has_zero_init

};

static void bdrv_raw_init(void)

{

    bdrv_register(&bdrv_raw);

}

block_init(bdrv_raw_init);