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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 passthrough requests

SYNOPSIS

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

ARGUMENTS

struct request_queue * q

request queue where request should be inserted

struct request * rq

request to fill

void * kbuf

the kernel buffer

unsigned int len

length of user data

gfp_t 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

June 2017 Kernel Hackers Manual 4.11