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 <asm/current.h>  /* for smp_lock.h */
  51 # include <linux/smp_lock.h>
  52 # include <linux/proc_fs.h>
  53 # include <linux/mount.h>
  54 # include <linux/lustre_intent.h>
  55 #endif
  56
  57 typedef struct {
  58         cfs_spinlock_t          lock;
  59
  60 #ifdef CLIENT_OBD_LIST_LOCK_DEBUG
  61         unsigned long       time;
  62         struct task_struct *task;
  63         const char         *func;
  64         int                 line;
  65 #endif
  66
  67 } client_obd_lock_t;
  68
  69 #ifdef CLIENT_OBD_LIST_LOCK_DEBUG
  70 static inline void __client_obd_list_lock(client_obd_lock_t *lock,
  71                                           const char *func,
  72                                           int line)
  73 {
  74         unsigned long cur = jiffies;
  75         while (1) {
  76                 if (cfs_spin_trylock(&lock->lock)) {
  77                         LASSERT(lock->task == NULL);
  78                         lock->task = current;
  79                         lock->func = func;
  80                         lock->line = line;
  81                         lock->time = jiffies;
  82                         break;
  83                 }
  84
  85                 if ((jiffies - cur > 5 * CFS_HZ) &&
  86                     (jiffies - lock->time > 5 * CFS_HZ)) {
  87                         LCONSOLE_WARN("LOCK UP! the lock %p was acquired"
  88                                       " by <%s:%d:%s:%d> %lu time, I'm %s:%d\n",
  89                                       lock, lock->task->comm, lock->task->pid,
  90                                       lock->func, lock->line,
  91                                       (jiffies - lock->time),
  92                                       current->comm, current->pid);
  93                         LCONSOLE_WARN("====== for process holding the "
  94                                       "lock =====\n");
  95                         libcfs_debug_dumpstack(lock->task);
  96                         LCONSOLE_WARN("====== for current process =====\n");
  97                         libcfs_debug_dumpstack(NULL);
  98                         LCONSOLE_WARN("====== end =======\n");
  99                         cfs_pause(1000 * CFS_HZ);
 100                 }
 101         }
 102 }
 103
 104 #define client_obd_list_lock(lock) \
 105         __client_obd_list_lock(lock, __FUNCTION__, __LINE__)
 106
 107 static inline void client_obd_list_unlock(client_obd_lock_t *lock)
 108 {
 109         LASSERT(lock->task != NULL);
 110         lock->task = NULL;
 111         lock->time = jiffies;
 112         cfs_spin_unlock(&lock->lock);
 113 }
 114
 115 #else /* ifdef CLIENT_OBD_LIST_LOCK_DEBUG */
 116 static inline void client_obd_list_lock(client_obd_lock_t *lock)
 117 {
 118         cfs_spin_lock(&lock->lock);
 119 }
 120
 121 static inline void client_obd_list_unlock(client_obd_lock_t *lock)
 122 {
 123         cfs_spin_unlock(&lock->lock);
 124 }
 125
 126 #endif /* ifdef CLIENT_OBD_LIST_LOCK_DEBUG */
 127
 128 static inline void client_obd_list_lock_init(client_obd_lock_t *lock)
 129 {
 130         cfs_spin_lock_init(&lock->lock);
 131 }
 132
 133 static inline void client_obd_list_lock_done(client_obd_lock_t *lock)
 134 {}
 135
 136 #if defined(__KERNEL__) && !defined(HAVE_ADLER)
 137 /* zlib_adler() is an inline function defined in zutil.h */
 138 #define HAVE_ADLER
 139 #endif
 140 #endif /* __LINUX_OBD_H */