};
void range_lock_tree_init(struct range_lock_tree *tree);
-void range_lock_init(struct range_lock *lock, __u64 start, __u64 end);
+int range_lock_init(struct range_lock *lock, __u64 start, __u64 end);
int range_lock(struct range_lock_tree *tree, struct range_lock *lock);
void range_unlock(struct range_lock_tree *tree, struct range_lock *lock);
#endif