diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
index cc24710..b758661 100644
--- a/fs/cifs/cifspdu.h
+++ b/fs/cifs/cifspdu.h
@@ -859,7 +859,10 @@
 	LOCKING_ANDX_RANGE Locks[1];
 } __attribute__((packed)) LOCK_REQ;
 
-
+/* lock type */
+#define CIFS_RDLCK	0
+#define CIFS_WRLCK	1
+#define CIFS_UNLCK      2
 typedef struct cifs_posix_lock {
 	__le16  lock_type;  /* 0 = Read, 1 = Write, 2 = Unlock */
 	__le16  lock_flags; /* 1 = Wait (only valid for setlock) */