1NBD_SET_SOCK _IO( 0xab, 0 ) 2NBD_SET_BLKSIZE _IO( 0xab, 1 ) 3NBD_SET_SIZE _IO( 0xab, 2 ) 4NBD_DO_IT _IO( 0xab, 3 ) 5NBD_CLEAR_SOCK _IO( 0xab, 4 ) 6NBD_CLEAR_QUE _IO( 0xab, 5 ) 7NBD_PRINT_DEBUG _IO( 0xab, 6 ) 8NBD_SET_SIZE_BLOCKS _IO( 0xab, 7 ) 9NBD_DISCONNECT _IO( 0xab, 8 ) 10NBD_SET_TIMEOUT _IO( 0xab, 9 ) 11NBD_SET_FLAGS _IO( 0xab, 10) 12