With that now being possible, bdrv_open() should try to extract a block
device reference from the options and pass it to bdrv_file_open().
Signed-off-by: NMax Reitz <mreitz@redhat.com>
Reviewed-by: NKevin Wolf <kwolf@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>