1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define DEBUG_SUBSYSTEM S_LDLM
39 #include <libcfs/libcfs.h>
41 #include <liblustre.h>
44 #include <lustre_dlm.h>
45 #include <lustre_lib.h>
48 * ldlm locking uses resource to serialize access to locks
49 * but there is a case when we change resource of lock upon
50 * enqueue reply. we rely on that lock->l_resource = new_res
53 struct ldlm_resource * lock_res_and_lock(struct ldlm_lock *lock)
55 struct ldlm_resource *res = NULL;
57 cfs_spin_lock(&lock->l_lock);
58 res = lock->l_resource;
60 if (ns_is_server(ldlm_res_to_ns(res)))
61 /* on server-side resource of lock doesn't change */
62 cfs_spin_unlock(&lock->l_lock);
68 void unlock_res_and_lock(struct ldlm_lock *lock)
70 struct ldlm_resource *res = lock->l_resource;
72 if (ns_is_server(ldlm_res_to_ns(res))) {
73 /* on server-side resource of lock doesn't change */
79 cfs_spin_unlock(&lock->l_lock);