btrfs: Document btrfs_csum_one_bio

	return ret;

}

/*

 * btrfs_csum_one_bio - Calculates checksums of the data contained inside a bio

 * @inode:	 Owner of the data inside the bio

 * @bio:	 Contains the data to be checksummed

 * @file_start:  offset in file this bio begins to describe

 * @contig:	 Boolean. If true/1 means all bio vecs in this bio are

 *		 contiguous and they begin at @file_start in the file. False/0

 *		 means this bio can contains potentially discontigous bio vecs

 *		 so the logical offset of each should be calculated separately.

 */

blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio,

		       u64 file_start, int contig)

{