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.
COPYRIGHTKernel Hackers Manual 2.6. November 2013 BIO_COPY_USER(9)