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	#ifdef INVARIANTS			#ifdef INVARIANTS
	int old = atomic_fetchadd_int(&vp->v_usecount, 1);			int old = atomic_fetchadd_int(&vp->v_usecount, 1);
	VNASSERT(old > 0, vp, ("%s: wrong use count %d", __func__, old));			VNASSERT(old > 0, vp, ("%s: wrong use count %d", __func__, old));
	#else			#else
	refcount_acquire(&vp->v_usecount);			refcount_acquire(&vp->v_usecount);
	#endif			#endif
	}			}

				void
				vrefactn(struct vnode *vp, u_int n)
				{

				CTR2(KTR_VFS, "%s: vp %p", __func__, vp);
				#ifdef INVARIANTS
				int old = atomic_fetchadd_int(&vp->v_usecount, n);
				VNASSERT(old > 0, vp, ("%s: wrong use count %d", __func__, old));
				#else
				atomic_add_int(&vp->v_usecount, n);
				#endif
				}

	/*			/*
	* Return reference count of a vnode.			* Return reference count of a vnode.
	*			*
	* The results of this call are only guaranteed when some mechanism is used to			* The results of this call are only guaranteed when some mechanism is used to
	* stop other processes from gaining references to the vnode. This may be the			* stop other processes from gaining references to the vnode. This may be the
	* case if the caller holds the only reference. This is also useful when stale			* case if the caller holds the only reference. This is also useful when stale
	* data is acceptable as race conditions may be accounted for by some other			* data is acceptable as race conditions may be accounted for by some other
	* means.			* means.
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