blk_rq_map_kern (9) Linux Manual Page
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.