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
       multiple times to append multiple buffers.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                        BLK_RQ_MAP_KERN(9)