| /* |
| * 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.gnu.org/licenses/gpl-2.0.html |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| * |
| * Copyright (c) 2012, Intel Corporation. |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| */ |
| |
| #define DEBUG_SUBSYSTEM S_LDLM |
| #include "../../include/linux/libcfs/libcfs.h" |
| |
| #include "../include/lustre_dlm.h" |
| #include "../include/lustre_lib.h" |
| |
| /** |
| * Lock a lock and its resource. |
| * |
| * LDLM locking uses resource to serialize access to locks |
| * but there is a case when we change resource of lock upon |
| * enqueue reply. We rely on lock->l_resource = new_res |
| * being an atomic operation. |
| */ |
| struct ldlm_resource *lock_res_and_lock(struct ldlm_lock *lock) |
| { |
| spin_lock(&lock->l_lock); |
| |
| lock_res(lock->l_resource); |
| |
| ldlm_set_res_locked(lock); |
| return lock->l_resource; |
| } |
| EXPORT_SYMBOL(lock_res_and_lock); |
| |
| /** |
| * Unlock a lock and its resource previously locked with lock_res_and_lock |
| */ |
| void unlock_res_and_lock(struct ldlm_lock *lock) |
| { |
| /* on server-side resource of lock doesn't change */ |
| ldlm_clear_res_locked(lock); |
| |
| unlock_res(lock->l_resource); |
| spin_unlock(&lock->l_lock); |
| } |
| EXPORT_SYMBOL(unlock_res_and_lock); |