nfs41: get_clid_cred for EXCHANGE_ID

Unlike SETCLIENTID, EXCHANGE_ID requires a machine credential. Do not search
for credentials other than the machine credential.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4_fs.h

@@ -248,6 +248,7 @@ struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp);
 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 #if defined(CONFIG_NFS_V4_1)
 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
+struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp);
 #endif /* CONFIG_NFS_V4_1 */
 
 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);

fs/nfs/nfs4proc.c

@@ -4796,6 +4796,7 @@ struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
 	.recover_open	= nfs4_open_reclaim,
 	.recover_lock	= nfs4_lock_reclaim,
 	.establish_clid = nfs4_proc_exchange_id,
+	.get_clid_cred	= nfs4_get_exchange_id_cred,
 };
 #endif /* CONFIG_NFS_V4_1 */
 
@@ -4815,6 +4816,7 @@ struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
 	.recover_open	= nfs4_open_expired,
 	.recover_lock	= nfs4_lock_expired,
 	.establish_clid = nfs4_proc_exchange_id,
+	.get_clid_cred	= nfs4_get_exchange_id_cred,
 };
 #endif /* CONFIG_NFS_V4_1 */
 

fs/nfs/nfs4state.c

@@ -114,6 +114,20 @@ struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
 	return cred;
 }
 
+#if defined(CONFIG_NFS_V4_1)
+
+struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
+{
+	struct rpc_cred *cred;
+
+	spin_lock(&clp->cl_lock);
+	cred = nfs4_get_machine_cred_locked(clp);
+	spin_unlock(&clp->cl_lock);
+	return cred;
+}
+
+#endif /* CONFIG_NFS_V4_1 */
+
 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
 {
 	struct nfs4_state_owner *sp;