Index: head/sys/fs/pseudofs/pseudofs_vnops.c
===================================================================
--- head/sys/fs/pseudofs/pseudofs_vnops.c
+++ head/sys/fs/pseudofs/pseudofs_vnops.c
@@ -967,7 +967,8 @@
 	PFS_TRACE(("%s", pn->pn_name));
 	pfs_assert_not_owned(pn);
 
-	PFS_RETURN (EOPNOTSUPP);
+	/* Silently ignore unchangeable attributes. */
+	PFS_RETURN (0);
 }
 
 /*