diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index e63e288..b9e7b8e 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -44,6 +44,7 @@ struct iomap {
  */
 #define IOMAP_WRITE		(1 << 0)
 #define IOMAP_ZERO		(1 << 1)
+#define IOMAP_FAULT		(1 << 3) /* mapping for page fault */
 
 struct iomap_ops {
 	/*