From c2b600f98fa62740e63e668034266fcecdf6f408 Mon Sep 17 00:00:00 2001
From: Mateusz Guzik <mjg@FreeBSD.org>
Date: Fri, 30 Aug 2019 21:54:45 +0000
Subject: [PATCH] vfs: add a missing VNODE_REFCOUNT_FENCE_REL to
 v_incr_usecount_locked

Sponsored by:	The FreeBSD Foundation
---
 sys/kern/vfs_subr.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index 6a8dfca8468..c380a36ba64 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -2641,6 +2641,7 @@ v_incr_usecount_locked(struct vnode *vp)
 		VNASSERT(vp->v_usecount == 0, vp,
 		    ("vnode with usecount and VI_OWEINACT set"));
 		vp->v_iflag &= ~VI_OWEINACT;
+		VNODE_REFCOUNT_FENCE_REL();
 	}
 	refcount_acquire(&vp->v_usecount);
 	v_incr_devcount(vp);