u64 bytenr, int mod);
int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
+ struct inode *inode,
u64 objectid, u64 offset,
char *data, size_t len);
struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,