diff --git a/sys/miscfs/genfs/genfs_node.h b/sys/miscfs/genfs/genfs_node.h
index 2d379bd131ec..102124fe2723 100644
--- a/sys/miscfs/genfs/genfs_node.h
+++ b/sys/miscfs/genfs/genfs_node.h
@@ -1,4 +1,4 @@
-/* $NetBSD: genfs_node.h,v 1.17 2008/05/14 16:49:47 reinoud Exp $ */
+/* $NetBSD: genfs_node.h,v 1.18 2010/01/27 15:18:40 uebayasi Exp $ */
 
 /*
  * Copyright (c) 2001 Chuck Silvers.
@@ -91,6 +91,7 @@ void	genfs_directio(struct vnode *, struct uio *, int);
 
 void	genfs_node_wrlock(struct vnode *);
 void	genfs_node_rdlock(struct vnode *);
+void	genfs_node_rdtrylock(struct vnode *);
 void	genfs_node_unlock(struct vnode *);
 
 #endif	/* _MISCFS_GENFS_GENFS_NODE_H_ */
diff --git a/sys/miscfs/genfs/genfs_vnops.c b/sys/miscfs/genfs/genfs_vnops.c
index 43ddd234506e..a6d41af7b06a 100644
--- a/sys/miscfs/genfs/genfs_vnops.c
+++ b/sys/miscfs/genfs/genfs_vnops.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: genfs_vnops.c,v 1.174 2009/11/20 13:42:43 roy Exp $	*/
+/*	$NetBSD: genfs_vnops.c,v 1.175 2010/01/27 15:18:40 uebayasi Exp $	*/
 
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
@@ -57,7 +57,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: genfs_vnops.c,v 1.174 2009/11/20 13:42:43 roy Exp $");
+__KERNEL_RCSID(0, "$NetBSD: genfs_vnops.c,v 1.175 2010/01/27 15:18:40 uebayasi Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -514,6 +514,14 @@ genfs_node_rdlock(struct vnode *vp)
 	rw_enter(&gp->g_glock, RW_READER);
 }
 
+void
+genfs_node_rdtrylock(struct vnode *vp)
+{
+	struct genfs_node *gp = VTOG(vp);
+
+	rw_tryenter(&gp->g_glock, RW_READER);
+}
+
 void
 genfs_node_unlock(struct vnode *vp)
 {