blk_rq_map_kern man page on Oracle

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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 3.8.	   June 2014		    BLK_RQ_MAP_KERN(9)
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