static void locks_insert_block(struct file_lock *blocker,
			       struct file_lock *waiter,
			       bool conflict(struct file_lock_core *,
					     struct file_lock_core *))
static void locks_insert_block(struct file_lock_core *blocker,
			       struct file_lock_core *waiter,
			       bool conflict(struct file_lock_core *,
					     struct file_lock_core *))