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-rw-r--r--include/linux/cleancache.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/cleancache.h b/include/linux/cleancache.h
index b23611f43cfb..bda5ec0b4b4d 100644
--- a/include/linux/cleancache.h
+++ b/include/linux/cleancache.h
@@ -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
 
 /*