--- zzzz-none-000/linux-3.10.107/include/linux/cleancache.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/include/linux/cleancache.h	2021-02-04 17:41:59.000000000 +0000
@@ -5,6 +5,10 @@
 #include <linux/exportfs.h>
 #include <linux/mm.h>
 
+#define CLEANCACHE_NO_POOL		-1
+#define CLEANCACHE_NO_BACKEND		-2
+#define CLEANCACHE_NO_BACKEND_SHARED	-3
+
 #define CLEANCACHE_KEY_MAX 6
 
 /*
@@ -33,10 +37,9 @@
 	void (*invalidate_fs)(int);
 };
 
-extern struct cleancache_ops *
-	cleancache_register_ops(struct cleancache_ops *ops);
+extern int cleancache_register_ops(struct cleancache_ops *ops);
 extern void __cleancache_init_fs(struct super_block *);
-extern void __cleancache_init_shared_fs(char *, struct super_block *);
+extern void __cleancache_init_shared_fs(struct super_block *);
 extern int  __cleancache_get_page(struct page *);
 extern void __cleancache_put_page(struct page *);
 extern void __cleancache_invalidate_page(struct address_space *, struct page *);
@@ -78,10 +81,10 @@
 		__cleancache_init_fs(sb);
 }
 
-static inline void cleancache_init_shared_fs(char *uuid, struct super_block *sb)
+static inline void cleancache_init_shared_fs(struct super_block *sb)
 {
 	if (cleancache_enabled)
-		__cleancache_init_shared_fs(uuid, sb);
+		__cleancache_init_shared_fs(sb);
 }
 
 static inline int cleancache_get_page(struct page *page)