--- ./fs/nfs/inode.c.orig	2005-07-29 12:11:47.000000000 +0200
+++ ./fs/nfs/inode.c	2005-07-29 13:51:20.000000000 +0200
@@ -974,7 +974,12 @@
 	struct nfs_open_context *ctx;
 	struct rpc_cred *cred;
 
-	cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, NULL, 0);
+	if (NFS_PROTO(inode)->version > 3)
+		cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, NULL, 0);
+	else {
+		struct rpc_groups fsg = { 1, { inode->i_gid } };
+		cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, &fsg, 0);
+	}
 	if (IS_ERR(cred))
 		return PTR_ERR(cred);
 	ctx = alloc_nfs_open_context(filp->f_dentry, cred);