Archipelago » qemu

 * Forwards an already correctly aligned write request to the BlockDriver.

static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,

    int64_t offset, unsigned int bytes, QEMUIOVector *qiov, int flags)

    int64_t sector_num = offset >> BDRV_SECTOR_BITS;

    unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS;

    assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);

    assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);

/*

 * Handle a write request in coroutine context

 */

static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,

    int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,

    BdrvRequestFlags flags)

{

    int ret;

    if (!bs->drv) {

        return -ENOMEDIUM;

    }

    if (bs->read_only) {

        return -EACCES;

    }

    if (bdrv_check_request(bs, sector_num, nb_sectors)) {

        return -EIO;

    }

    if (bs->copy_on_read_in_flight) {

        wait_for_overlapping_requests(bs, sector_num, nb_sectors);

    }

    /* throttling disk I/O */

    if (bs->io_limits_enabled) {

        bdrv_io_limits_intercept(bs, nb_sectors, true);

    }

    ret = bdrv_aligned_pwritev(bs, sector_num << BDRV_SECTOR_BITS,

                               nb_sectors << BDRV_SECTOR_BITS, qiov, flags);

    return ret;

}