+struct ldlm_lock;
+int ll_lock_callback(struct ldlm_lock *, struct ldlm_lock_desc *, void *data,
+ __u32 data_len);
+int ll_size_lock(struct inode *, struct lov_stripe_md *, __u64 start, int mode,
+ struct lustre_handle **);
+int ll_size_unlock(struct inode *, struct lov_stripe_md *, int mode,
+ struct lustre_handle *);
+int ll_file_size(struct inode *inode, struct lov_stripe_md *md);