diff --git a/sys/sys/rangelock.h b/sys/sys/rangelock.h
index 3169c251a49..00fe7eee851 100644
--- a/sys/sys/rangelock.h
+++ b/sys/sys/rangelock.h
@@ -46,6 +46,9 @@ struct rl_q_entry;
  * all existing lock owners are compatible with the request. Two lock
  * owners are compatible if their ranges do not overlap, or both
  * owners are for read.
+ *
+ * The resvX fields can be used by consumers.  For instance, struct
+ * vnode uses resv1 as v_vrflag.
  */
 struct rangelock {
 	uintptr_t head;
diff --git a/sys/sys/vnode.h b/sys/sys/vnode.h
index 3fd2c770cda..7dde7183414 100644
--- a/sys/sys/vnode.h
+++ b/sys/sys/vnode.h
@@ -203,6 +203,7 @@ struct vnode {
 						   (negative) text users */
 	int	v_seqc_users;			/* i modifications pending */
 };
+#define	v_vrflag	v_rl.resv1
 
 #define VN_ISDEV(vp)		VTYPE_ISDEV((vp)->v_type)