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, 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 #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 # include <linux/fs.h>
47 # include <linux/list.h>
48 # include <linux/sched.h> /* for struct task_struct, for current.h */
49 # include <linux/proc_fs.h>
50 # include <linux/mount.h>
51 #include "../lustre_intent.h"
52
53 struct ll_iattr {
54 struct iattr iattr;
55 unsigned int ia_attr_flags;
56 };
57
58 #define CLIENT_OBD_LIST_LOCK_DEBUG 1
59
60 typedef struct {
61 spinlock_t lock;
62
63 unsigned long time;
64 struct task_struct *task;
65 const char *func;
66 int line;
67 } client_obd_lock_t;
68
__client_obd_list_lock(client_obd_lock_t * lock,const char * func,int line)69 static inline void __client_obd_list_lock(client_obd_lock_t *lock,
70 const char *func, int line)
71 {
72 unsigned long cur = jiffies;
73 while (1) {
74 if (spin_trylock(&lock->lock)) {
75 LASSERT(lock->task == NULL);
76 lock->task = current;
77 lock->func = func;
78 lock->line = line;
79 lock->time = jiffies;
80 break;
81 }
82
83 if (time_before(cur + 5 * HZ, jiffies) &&
84 time_before(lock->time + 5 * HZ, jiffies)) {
85 struct task_struct *task = lock->task;
86
87 if (task == NULL)
88 continue;
89
90 LCONSOLE_WARN("%s:%d: lock %p was acquired by <%s:%d:%s:%d> for %lu seconds.\n",
91 current->comm, current->pid,
92 lock, task->comm, task->pid,
93 lock->func, lock->line,
94 (jiffies - lock->time) / HZ);
95 LCONSOLE_WARN("====== for current process =====\n");
96 dump_stack();
97 LCONSOLE_WARN("====== end =======\n");
98 set_current_state(TASK_UNINTERRUPTIBLE);
99 schedule_timeout(1000 * HZ);
100 }
101 cpu_relax();
102 }
103 }
104
105 #define client_obd_list_lock(lock) \
106 __client_obd_list_lock(lock, __func__, __LINE__)
107
client_obd_list_unlock(client_obd_lock_t * lock)108 static inline void client_obd_list_unlock(client_obd_lock_t *lock)
109 {
110 LASSERT(lock->task != NULL);
111 lock->task = NULL;
112 lock->time = jiffies;
113 spin_unlock(&lock->lock);
114 }
115
116
client_obd_list_lock_init(client_obd_lock_t * lock)117 static inline void client_obd_list_lock_init(client_obd_lock_t *lock)
118 {
119 spin_lock_init(&lock->lock);
120 }
121
client_obd_list_lock_done(client_obd_lock_t * lock)122 static inline void client_obd_list_lock_done(client_obd_lock_t *lock)
123 {}
124
125 #endif /* __LINUX_OBD_H */
126