Copy kernel address into bio
struct bio * bio_copy_kern(struct request_queue * q, void * data, unsigned int len, gfp_t gfp_mask, int reading);
q
the struct request_queue for the bio
data
pointer to buffer to copy
len
length in bytes
gfp_mask
allocation flags for bio and page allocation
reading
data direction is READ
copy the kernel address into a bio suitable for io to a block device. Returns an error pointer in case of error.