/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
- * Copyright (c) 2002, 2003 Cluster File Systems, Inc.
- * Author: Peter Braam <braam@clusterfs.com>
- * Author: Phil Schwan <phil@clusterfs.com>
+ * GPL HEADER START
*
- * This file is part of the Lustre file system, http://www.lustre.org
- * Lustre is a trademark of Cluster File Systems, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * You may have signed or agreed to another license before downloading
- * this software. If so, you are bound by the terms and conditions
- * of that agreement, and the following does not apply to you. See the
- * LICENSE file included with this distribution for more information.
+ * 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.
*
- * If you did not agree to a different license, then this copy of Lustre
- * is open source software; you can redistribute it and/or modify it
- * under the terms of version 2 of the GNU General Public License 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).
*
- * In either case, Lustre 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
- * license text for more details.
+ * 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.
+ *
+ * lustre/ldlm/ldlm_plain.c
+ *
+ * Author: Peter Braam <braam@clusterfs.com>
+ * Author: Phil Schwan <phil@clusterfs.com>
*/
#define DEBUG_SUBSYSTEM S_LDLM
if (req == lock)
RETURN(compat);
- if (lockmode_compat(lock->l_req_mode, req_mode)) {
- /* jump to next mode group */
- if (LDLM_SL_HEAD(&lock->l_sl_mode))
- tmp = &list_entry(lock->l_sl_mode.next,
- struct ldlm_lock,
- l_sl_mode)->l_res_link;
+ /* last lock in mode group */
+ tmp = &list_entry(lock->l_sl_mode.prev,
+ struct ldlm_lock,
+ l_sl_mode)->l_res_link;
+
+ if (lockmode_compat(lock->l_req_mode, req_mode))
continue;
- }
if (!work_list)
RETURN(0);
compat = 0;
+
+ /* add locks of the mode group to @work_list as
+ * blocking locks for @req */
if (lock->l_blocking_ast)
ldlm_add_ast_work_item(lock, req, work_list);
- if (LDLM_SL_HEAD(&lock->l_sl_mode)) {
- /* add all members of the mode group */
- do {
- tmp = lock->l_res_link.next;
- lock = list_entry(tmp, struct ldlm_lock,
- l_res_link);
+ {
+ struct list_head *head;
+
+ head = &lock->l_sl_mode;
+ list_for_each_entry(lock, head, l_sl_mode)
if (lock->l_blocking_ast)
- ldlm_add_ast_work_item(
- lock, req, work_list);
- } while (!LDLM_SL_TAIL(&lock->l_sl_mode));
+ ldlm_add_ast_work_item(lock, req,
+ work_list);
}
}