centos man page for blk_queue_flush

BLK_QUEUE_FLUSH(9)						   Block Devices						BLK_QUEUE_FLUSH(9)

NAME
       blk_queue_flush - configure queue's cache flush capability

SYNOPSIS
       void blk_queue_flush(struct request_queue * q, unsigned int flush);

ARGUMENTS
       q
	   the request queue for the device

       flush
	   0, REQ_FLUSH or REQ_FLUSH | REQ_FUA

DESCRIPTION
       Tell block layer cache flush capability of q. If it supports flushing, REQ_FLUSH should be set. If it supports bypassing write cache for
       individual writes, REQ_FUA should be set.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							BLK_QUEUE_FLUSH(9)