Index: ufs/ufs/ufs_vnops.c
===================================================================
RCS file: /home/ncvs/src/sys/ufs/ufs/ufs_vnops.c,v
retrieving revision 1.158
diff -u -r1.158 ufs_vnops.c
--- ufs/ufs/ufs_vnops.c	2001/02/23 20:06:01	1.158
+++ ufs/ufs/ufs_vnops.c	2001/03/13 06:09:07
@@ -700,6 +700,8 @@
 		goto out;
 	}
 	error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
+	if (ip->i_nlink <= 0)
+		vp->v_flag |= VNOSYNC;
 	VN_KNOTE(vp, NOTE_DELETE);
 	VN_KNOTE(dvp, NOTE_WRITE);
 out:
Index: kern/vfs_subr.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/vfs_subr.c,v
retrieving revision 1.305
diff -u -r1.305 vfs_subr.c
--- kern/vfs_subr.c	2001/02/23 20:05:57	1.305
+++ kern/vfs_subr.c	2001/03/13 06:09:07
@@ -2593,6 +2597,9 @@
 		if (vp->v_flag & VXLOCK)	/* XXX: what if MNT_WAIT? */
 			continue;
 
+		if (vp->v_flag & VNOSYNC)	/* unlinked, skip it */
+			continue;
+
 		if (flags != MNT_WAIT) {
 			if (VOP_GETVOBJECT(vp, &obj) != 0 ||
 			    (obj->flags & OBJ_MIGHTBEDIRTY) == 0)
Index: sys/vnode.h
===================================================================
RCS file: /home/ncvs/src/sys/sys/vnode.h,v
retrieving revision 1.138
diff -u -r1.138 vnode.h
--- sys/vnode.h	2001/03/06 17:28:24	1.138
+++ sys/vnode.h	2001/03/13 06:09:07
@@ -169,6 +169,7 @@
 /* open for business	0x100000 */
 #define	VONWORKLST	0x200000 /* On syncer work-list */
 #define	VMOUNT		0x400000 /* Mount in progress */
+#define	VNOSYNC		0x800000 /* Backing file unlinked, do not sync() */
 
 /*
  * Vnode attributes.  A field value of VNOVAL represents a field whose value