diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index 4be9a28..08ad214 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -103,7 +103,8 @@
 	FUSE_WRITE	= 16,
 	FUSE_STATFS	= 17,
 	FUSE_RELEASE    = 18, /* no reply */
-	FUSE_INVALIDATE = 19  /* user initiated */
+	FUSE_INVALIDATE = 19, /* user initiated */
+	FUSE_FSYNC      = 20
 };
 
 /* Conservative buffer size for the client */
@@ -176,6 +177,10 @@
 	struct fuse_kstatfs st;
 };
 
+struct fuse_fsync_in {
+	int datasync;
+};
+
 struct fuse_in_header {
 	int unique;
 	enum fuse_opcode opcode;