BIO_COPY_USER

NAME

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.  

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