D21358.id61252.diff
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	Index: head/sys/kern/vfs_subr.c
	===================================================================
	--- head/sys/kern/vfs_subr.c
	+++ head/sys/kern/vfs_subr.c
	@@ -3018,6 +3018,19 @@
	VI_UNLOCK(vp);
	}

	+void
	+vholdnz(struct vnode *vp)
	+{
	+
	+ CTR2(KTR_VFS, "%s: vp %p", __func__, vp);
	+#ifdef INVARIANTS
	+ int old = atomic_fetchadd_int(&vp->v_holdcnt, 1);
	+ VNASSERT(old > 0, vp, ("%s: wrong hold count", __func__));
	+#else
	+ atomic_add_int(&vp->v_holdcnt, 1);
	+#endif
	+}
	+
	/*
	* Drop the hold count of the vnode. If this is the last reference to
	* the vnode we place it on the free list unless it has been vgone'd
	Index: head/sys/sys/vnode.h
	===================================================================
	--- head/sys/sys/vnode.h
	+++ head/sys/sys/vnode.h
	@@ -657,6 +657,7 @@
	#define vhold(vp) _vhold((vp), 0)
	#define vholdl(vp) _vhold((vp), 1)
	void _vhold(struct vnode *, bool);
	+void vholdnz(struct vnode *);
	void vinactive(struct vnode , struct thread );
	int vinvalbuf(struct vnode *vp, int save, int slpflag, int slptimeo);
	int vtruncbuf(struct vnode *vp, off_t length, int blksize);