1 files changed, 13 insertions, 2 deletions
diff --git a/sys/fs/nullfs/null.h b/sys/fs/nullfs/null.h
index ad3f7779e108..7bfdc20a3f67 100644
--- a/sys/fs/nullfs/null.h
+++ b/sys/fs/nullfs/null.h
@@ -35,11 +35,12 @@
 #ifndef	FS_NULL_H
 #define	FS_NULL_H
 
-#define	NULLM_CACHE	0x0001
-
 #include <sys/ck.h>
 #include <vm/uma.h>
 
+#define	NULLM_CACHE		0x0001
+#define	NULLM_NOUNPBYPASS	0x0002
+
 struct null_mount {
 	struct mount	*nullm_vfs;
 	struct vnode	*nullm_lowerrootvp;	/* Ref to lower root vnode */
@@ -82,6 +83,16 @@ struct vnode *null_checkvp(struct vnode *vp, char *fil, int lno);
 #endif
 
 extern struct vop_vector null_vnodeops;
+extern struct vop_vector null_vnodeops_no_unp_bypass;
+
+static inline bool
+null_is_nullfs_vnode(struct vnode *vp)
+{
+	const struct vop_vector *op;
+
+	op = vp->v_op;
+	return (op == &null_vnodeops || op == &null_vnodeops_no_unp_bypass);
+}
 
 extern uma_zone_t null_node_zone;