NBD_SET_SOCK		_IO( 0xab, 0 )
NBD_SET_BLKSIZE		_IO( 0xab, 1 )
NBD_SET_SIZE		_IO( 0xab, 2 )
NBD_DO_IT		_IO( 0xab, 3 )
NBD_CLEAR_SOCK		_IO( 0xab, 4 )
NBD_CLEAR_QUE		_IO( 0xab, 5 )
NBD_PRINT_DEBUG		_IO( 0xab, 6 )
NBD_SET_SIZE_BLOCKS	_IO( 0xab, 7 )
NBD_DISCONNECT		_IO( 0xab, 8 )
NBD_SET_TIMEOUT		_IO( 0xab, 9 )
NBD_SET_FLAGS		_IO( 0xab, 10)