centos man page for blk_rq_map_kern

BLK_RQ_MAP_KERN(9)						   Block Devices						BLK_RQ_MAP_KERN(9)

NAME
       blk_rq_map_kern - map kernel data to a request, for REQ_TYPE_BLOCK_PC usage

SYNOPSIS
       int blk_rq_map_kern(struct request_queue * q, struct request * rq, void * kbuf, unsigned int len, gfp_t gfp_mask);

ARGUMENTS
       q
	   request queue where request should be inserted

       rq
	   request to fill

       kbuf
	   the kernel buffer

       len
	   length of user data

       gfp_mask
	   memory allocation flags

DESCRIPTION
       Data will be mapped directly if possible. Otherwise a bounce buffer is used. Can be called multple times to append multple buffers.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							BLK_RQ_MAP_KERN(9)