- In ffs_update() assert that either the vnode lock or the XLOCK is held.

sys/ufs/ffs/ffs_inode.c

@@ -84,6 +84,10 @@ ffs_update(vp, waitfor)
 	struct inode *ip;
 	int error;
 
+#ifdef DEBUG_VFS_LOCKS
+	if ((vp->v_iflag & VI_XLOCK) == 0)
+		ASSERT_VOP_LOCKED(vp, "ffs_update");
+#endif
 	ufs_itimes(vp);
 	ip = VTOI(vp);
 	if ((ip->i_flag & IN_MODIFIED) == 0 && waitfor == 0)