centos man page for blk_rq_unmap_user

BLK_RQ_UNMAP_USER(9)						   Block Devices					      BLK_RQ_UNMAP_USER(9)

NAME
       blk_rq_unmap_user - unmap a request with user data

SYNOPSIS
       int blk_rq_unmap_user(struct bio * bio);

ARGUMENTS
       bio
	   start of bio list

DESCRIPTION
       Unmap a rq previously mapped by blk_rq_map_user. The caller must supply the original rq->bio from the blk_rq_map_user return, since the I/O
       completion may have changed rq->bio.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						      BLK_RQ_UNMAP_USER(9)