b=16098

[fs/lustre-release.git] / lustre / include / lustre_cache.h

diff --git a/lustre/include/lustre_cache.h b/lustre/include/lustre_cache.h
index 291d882..e06de11 100644 (file)
--- a/lustre/include/lustre_cache.h
+++ b/lustre/include/lustre_cache.h
@@ -1,5 +1,37 @@
 /* -*- 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 [sun.com URL with a
+ * copy of GPLv2].
+ *
+ * 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_CACHE_H
@@ -13,6 +45,7 @@ struct osc_async_page;
 struct page_removal_cb_element {
         struct list_head        prce_list;
         obd_page_removal_cb_t   prce_callback;
+        atomic_t                prce_refcnt;
 };
 
 typedef int (*cache_iterate_extents_cb_t)(struct lustre_cache *,
@@ -27,6 +60,7 @@ struct lustre_cache {
         struct list_head         lc_locks_list;
         spinlock_t               lc_locks_list_lock;
         struct list_head         lc_page_removal_callback_list;
+        rwlock_t                 lc_page_removal_cb_lock; /* iterate vs modify list */
         struct obd_device       *lc_obd;
         obd_pin_extent_cb        lc_pin_extent_cb;
 };