BIO_COPY_USER(9) The Linux VFS BIO_COPY_USER(9)

NAME bio_copy_user - copy user data to bio

SYNOPSIS struct bio * bio_copy_user(struct request_queue * q, struct rq_map_data * map_data, unsigned long uaddr, unsigned int len, int write_to_vm, gfp_t gfp_mask);

ARGUMENTS q destination block queue

map_data pointer to the rq_map_data holding pages (if necessary)

uaddr start of user address

len length in bytes

write_to_vm bool indicating writing to pages or not

gfp_mask memory allocation flags

DESCRIPTION Prepares and returns a bio for indirect user io, bouncing data to/from kernel pages as necessary. Must be paired with call bio_uncopy_user on io completion.

COPYRIGHT Kernel Hackers Manual 2.6. April 2016 BIO_COPY_USER(9)