btrfs_bio_clone   502 fs/btrfs/extent_io.h struct bio *btrfs_bio_clone(struct bio *bio);
btrfs_bio_clone  8612 fs/btrfs/inode.c 	bio = btrfs_bio_clone(dio_bio);
btrfs_bio_clone  6619 fs/btrfs/volumes.c 			bio = btrfs_bio_clone(first_bio);