Index: sys/ufs/ffs/ffs_vnops.c
===================================================================
RCS file: /home/ncvs/src/sys/ufs/ffs/ffs_vnops.c,v
retrieving revision 1.129
retrieving revision 1.130
diff -u -r1.129 -r1.130
--- sys/ufs/ffs/ffs_vnops.c	7 Apr 2004 11:21:18 -0000	1.129
+++ sys/ufs/ffs/ffs_vnops.c	21 May 2004 12:05:48 -0000	1.130
@@ -662,6 +662,8 @@
 			vfs_bio_clrbuf(bp);
 		if (ioflag & IO_DIRECT)
 			bp->b_flags |= B_DIRECT;
+		if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL))
+			bp->b_flags |= B_NOCACHE;
 
 		if (uio->uio_offset + xfersize > ip->i_size) {
 			ip->i_size = uio->uio_offset + xfersize;
Index: sys/vm/vm_object.c
===================================================================
RCS file: /home/ncvs/src/sys/vm/vm_object.c,v
retrieving revision 1.323
retrieving revision 1.324
diff -u -r1.323 -r1.324
--- sys/vm/vm_object.c	6 Apr 2004 20:15:36 -0000	1.323
+++ sys/vm/vm_object.c	25 May 2004 18:40:53 -0000	1.324
@@ -104,6 +104,10 @@
 SYSCTL_INT(_vm, OID_AUTO, msync_flush_flags,
         CTLFLAG_RW, &msync_flush_flags, 0, "");
 
+static int old_msync;
+SYSCTL_INT(_vm, OID_AUTO, old_msync, CTLFLAG_RW, &old_msync, 0,
+    "Use old (insecure) msync behavior");
+
 static void	vm_object_qcollapse(vm_object_t object);
 static int	vm_object_page_collect_flush(vm_object_t object, vm_page_t p, int curgeneration, int pagerflags);
 
@@ -1034,7 +1038,7 @@
 		vm_object_page_remove(object,
 		    OFF_TO_IDX(offset),
 		    OFF_TO_IDX(offset + size + PAGE_MASK),
-		    FALSE);
+		    old_msync ? FALSE : TRUE);
 	}
 	VM_OBJECT_UNLOCK(object);
 }