bio_copy_user man page on Oracle

bio_copy_user man page on Oracle

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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 3.8.	   June 2014		      BIO_COPY_USER(9)

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