[PATCH] Make locks work on NFS3 krb5 mounts

[Mark Goodman <mgoodman@CSUA.Berkeley.EDU>]

This patch makes locks work on NFS3 krb5 mounts. In particular, it makes 
gconf-sanity-check-1 succeed when my home directory is a NFS3 krb5 
mount. gconf-sanity-check-1 is part of GConf. It applies to 2.6.9-rc2. 
Please consider applying.

Signed-off-by: Mark Goodman <mgoodman@csua.berkeley.edu>

--- linux-2.6.9-rc2/net/sunrpc/clnt.c.orig    2004-09-12 
22:32:17.000000000 -0700
+++ linux-2.6.9-rc2/net/sunrpc/clnt.c    2004-09-23 13:35:12.028606648 -0700
@@ -425,6 +425,16 @@ rpc_call_setup(struct rpc_task *task, st
 {
     task->tk_msg   = *msg;
     task->tk_flags |= flags;
+
+    /*
+     * For a nfs3 krb5 mount, lockd tries to use a RPCSEC cred with UNIX
+     * auth. If that's the case, get a UNIX cred.
+     */
+    if (task->tk_msg.rpc_cred != NULL &&
+        task->tk_msg.rpc_cred->cr_auth->au_ops != task->tk_auth->au_ops) {
+        task->tk_msg.rpc_cred = NULL;
+    }
+
     /* Bind the user cred */
     if (task->tk_msg.rpc_cred != NULL) {
         rpcauth_holdcred(task);