1 #value_indexed 2 IOCB_CMD_PREAD 0 3 IOCB_CMD_PWRITE 1 4 IOCB_CMD_FSYNC 2 5 IOCB_CMD_FDSYNC 3 6 IOCB_CMD_PREADX 4 7 IOCB_CMD_POLL 5 8 IOCB_CMD_NOOP 6 9 IOCB_CMD_PREADV 7 10 IOCB_CMD_PWRITEV 8 11
