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diff --git a/lustre/include/lustre_handles.h b/lustre/include/lustre_handles.h
index bbd2fcd..5bc386d 100644
--- a/lustre/include/lustre_handles.h
+++ b/lustre/include/lustre_handles.h
@@ -1,3 +1,39 @@
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright  2008 Sun Microsystems, Inc. All rights reserved
+ * Use is subject to license terms.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ */
+
 #ifndef __LUSTRE_HANDLES_H_
 #define __LUSTRE_HANDLES_H_
 
@@ -29,14 +65,26 @@ struct portals_handle {
         struct list_head h_link;
         __u64 h_cookie;
         portals_handle_addref_cb h_addref;
+
+        /* newly added fields to handle the RCU issue. -jxiong */
+        spinlock_t h_lock;
+        void *h_ptr;
+        void (*h_free_cb)(void *, size_t);
+        struct rcu_head h_rcu;
+        unsigned int h_size;
+        __u8 h_in:1;
+        __u8 h_unused[3];
 };
+#define RCU2HANDLE(rcu)    container_of(rcu, struct portals_handle, h_rcu)
 
 /* handles.c */
 
 /* Add a handle to the hash table */
 void class_handle_hash(struct portals_handle *, portals_handle_addref_cb);
 void class_handle_unhash(struct portals_handle *);
+void class_handle_hash_back(struct portals_handle *);
 void *class_handle2object(__u64 cookie);
+void class_handle_free_cb(struct rcu_head *);
 int class_handle_init(void);
 void class_handle_cleanup(void);