projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d7e09d03 PT |
1 | /* |
| 2 | * GPL HEADER START | |
| 3 | * | |
| 4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 only, | |
| 8 | * as published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, but | |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | * General Public License version 2 for more details (a copy is included | |
| 14 | * in the LICENSE file that accompanied this code). | |
| 15 | * | |
| 16 | * You should have received a copy of the GNU General Public License | |
| 17 | * version 2 along with this program; If not, see | |
| 18 | * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf | |
| 19 | * | |
| 20 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 21 | * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 22 | * have any questions. | |
| 23 | * | |
| 24 | * GPL HEADER END | |
| 25 | */ | |
| 26 | /* | |
| 27 | * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. | |
| 28 | * Use is subject to license terms. | |
| 29 | * | |
| 30 | * Copyright (c) 2012, Intel Corporation. | |
| 31 | */ | |
| 32 | /* | |
| 33 | * This file is part of Lustre, http://www.lustre.org/ | |
| 34 | * Lustre is a trademark of Sun Microsystems, Inc. | |
| 35 | */ | |
| 36 | ||
| 37 | #define DEBUG_SUBSYSTEM S_LDLM | |
| 38 | #include <linux/libcfs/libcfs.h> | |
| 39 | ||
| 40 | #include <lustre_dlm.h> | |
| 41 | #include <lustre_lib.h> | |
| 42 | ||
| 43 | /** | |
| 44 | * Lock a lock and its resource. | |
| 45 | * | |
| 46 | * LDLM locking uses resource to serialize access to locks | |
| 47 | * but there is a case when we change resource of lock upon | |
| 48 | * enqueue reply. We rely on lock->l_resource = new_res | |
| 49 | * being an atomic operation. | |
| 50 | */ | |
| 51 | struct ldlm_resource *lock_res_and_lock(struct ldlm_lock *lock) | |
| 52 | { | |
| 53 | /* on server-side resource of lock doesn't change */ | |
| f2145eae | 54 | if ((lock->l_flags & LDLM_FL_NS_SRV) == 0) |
| d7e09d03 PT |
55 | spin_lock(&lock->l_lock); |
| 56 | ||
| 57 | lock_res(lock->l_resource); | |
| 58 | ||
| f2145eae | 59 | lock->l_flags |= LDLM_FL_RES_LOCKED; |
| d7e09d03 PT |
60 | return lock->l_resource; |
| 61 | } | |
| 62 | EXPORT_SYMBOL(lock_res_and_lock); | |
| 63 | ||
| 64 | /** | |
| 65 | * Unlock a lock and its resource previously locked with lock_res_and_lock | |
| 66 | */ | |
| 67 | void unlock_res_and_lock(struct ldlm_lock *lock) | |
| 68 | { | |
| 69 | /* on server-side resource of lock doesn't change */ | |
| f2145eae | 70 | lock->l_flags &= ~LDLM_FL_RES_LOCKED; |
| d7e09d03 PT |
71 | |
| 72 | unlock_res(lock->l_resource); | |
| f2145eae | 73 | if ((lock->l_flags & LDLM_FL_NS_SRV) == 0) |
| d7e09d03 PT |
74 | spin_unlock(&lock->l_lock); |
| 75 | } | |
| 76 | EXPORT_SYMBOL(unlock_res_and_lock); |