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LU-812 kernel: remove smp_lock.h
[fs/lustre-release.git] / lustre / include / linux / obd.h
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) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2011, Whamcloud, Inc.
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 #ifndef __LINUX_OBD_H
38 #define __LINUX_OBD_H
39
40 #ifndef __OBD_H
41 #error Do not #include this file directly. #include <obd.h> instead
42 #endif
43
44 #include <obd_support.h>
45
46 #ifdef __KERNEL__
47 # include <linux/fs.h>
48 # include <linux/list.h>
49 # include <linux/sched.h>  /* for struct task_struct, for current.h */
50 # include <linux/proc_fs.h>
51 # include <linux/mount.h>
52 # include <linux/lustre_intent.h>
53 #endif
54
55 #define CLIENT_OBD_LIST_LOCK_DEBUG 1
56 typedef struct {
57         cfs_spinlock_t          lock;
58
59 #ifdef CLIENT_OBD_LIST_LOCK_DEBUG
60         unsigned long       time;
61         struct task_struct *task;
62         const char         *func;
63         int                 line;
64 #endif
65
66 } client_obd_lock_t;
67
68 #ifdef CLIENT_OBD_LIST_LOCK_DEBUG
69 static inline void __client_obd_list_lock(client_obd_lock_t *lock,
70                                           const char *func,
71                                           int line)
72 {
73         unsigned long cur = jiffies;
74         while (1) {
75                 if (cfs_spin_trylock(&lock->lock)) {
76                         LASSERT(lock->task == NULL);
77                         lock->task = current;
78                         lock->func = func;
79                         lock->line = line;
80                         lock->time = jiffies;
81                         break;
82                 }
83
84                 if ((jiffies - cur > 5 * CFS_HZ) &&
85                     (jiffies - lock->time > 5 * CFS_HZ)) {
86                         LCONSOLE_WARN("LOCK UP! the lock %p was acquired"
87                                       " by <%s:%d:%s:%d> %lu time, I'm %s:%d\n",
88                                       lock, lock->task->comm, lock->task->pid,
89                                       lock->func, lock->line,
90                                       (jiffies - lock->time),
91                                       current->comm, current->pid);
92                         LCONSOLE_WARN("====== for process holding the "
93                                       "lock =====\n");
94                         libcfs_debug_dumpstack(lock->task);
95                         LCONSOLE_WARN("====== for current process =====\n");
96                         libcfs_debug_dumpstack(NULL);
97                         LCONSOLE_WARN("====== end =======\n");
98                         cfs_pause(1000 * CFS_HZ);
99                 }
100         }
101 }
102
103 #define client_obd_list_lock(lock) \
104         __client_obd_list_lock(lock, __FUNCTION__, __LINE__)
105
106 static inline void client_obd_list_unlock(client_obd_lock_t *lock)
107 {
108         LASSERT(lock->task != NULL);
109         lock->task = NULL;
110         lock->time = jiffies;
111         cfs_spin_unlock(&lock->lock);
112 }
113
114 #else /* ifdef CLIENT_OBD_LIST_LOCK_DEBUG */
115 static inline void client_obd_list_lock(client_obd_lock_t *lock)
116 {
117         cfs_spin_lock(&lock->lock);
118 }
119
120 static inline void client_obd_list_unlock(client_obd_lock_t *lock)
121 {
122         cfs_spin_unlock(&lock->lock);
123 }
124
125 #endif /* ifdef CLIENT_OBD_LIST_LOCK_DEBUG */
126
127 static inline void client_obd_list_lock_init(client_obd_lock_t *lock)
128 {
129         cfs_spin_lock_init(&lock->lock);
130 }
131
132 static inline void client_obd_list_lock_done(client_obd_lock_t *lock)
133 {}
134
135 #if defined(__KERNEL__) && !defined(HAVE_ADLER)
136 /* zlib_adler() is an inline function defined in zutil.h */
137 #define HAVE_ADLER
138 #endif
139 #endif /* __LINUX_OBD_H */