diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index 861b467..8a916dc 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -388,6 +388,9 @@ struct cftype {
 	struct list_head node;		/* anchored at ss->cfts */
 	struct kernfs_ops *kf_ops;
 
+	int (*open)(struct kernfs_open_file *of);
+	void (*release)(struct kernfs_open_file *of);
+
 	/*
 	 * read_u64() is a shortcut for the common case of returning a
 	 * single integer. Use it in place of read()