libcfs/include/libcfs/linux/linux-lock.h

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * libcfs/include/libcfs/linux/linux-lock.h
  37  *
  38  * Basic library routines.
  39  */
  40
  41 #ifndef __LIBCFS_LINUX_CFS_LOCK_H__
  42 #define __LIBCFS_LINUX_CFS_LOCK_H__
  43
  44 #ifndef __LIBCFS_LIBCFS_H__
  45 #error Do not #include this file directly. #include <libcfs/libcfs.h> instead
  46 #endif
  47
  48 #ifndef __KERNEL__
  49 #error This include is only for kernel use.
  50 #endif
  51
  52 #include <linux/smp_lock.h>
  53 #include <linux/mutex.h>
  54
  55 /*
  56  * IMPORTANT !!!!!!!!
  57  *
  58  * All locks' declaration are not guaranteed to be initialized,
  59  * Althought some of they are initialized in Linux. All locks
  60  * declared by CFS_DECL_* should be initialized explicitly.
  61  */
  62
  63 /*
  64  * spin_lock "implementation" (use Linux kernel's primitives)
  65  *
  66  * - spin_lock_init(x)
  67  * - spin_lock(x)
  68  * - spin_lock_bh(x)
  69  * - spin_lock_bh_init(x)
  70  * - spin_unlock(x)
  71  * - spin_unlock_bh(x)
  72  * - spin_trylock(x)
  73  * - spin_is_locked(x)
  74  *
  75  * - spin_lock_irq(x)
  76  * - spin_lock_irqsave(x, f)
  77  * - spin_unlock_irqrestore(x, f)
  78  * - read_lock_irqsave(lock, f)
  79  * - write_lock_irqsave(lock, f)
  80  * - write_unlock_irqrestore(lock, f)
  81  *
  82  * - SPIN_LOCK_UNLOCKED
  83  */
  84
  85 /*
  86  * spinlock "implementation"
  87  */
  88
  89 typedef spinlock_t cfs_spinlock_t;
  90
  91 #define cfs_spin_lock_init(lock)             spin_lock_init(lock)
  92 #define cfs_spin_lock(lock)                  spin_lock(lock)
  93 #define cfs_spin_lock_bh(lock)               spin_lock_bh(lock)
  94 #define cfs_spin_lock_bh_init(lock)          spin_lock_bh_init(lock)
  95 #define cfs_spin_unlock(lock)                spin_unlock(lock)
  96 #define cfs_spin_unlock_bh(lock)             spin_unlock_bh(lock)
  97 #define cfs_spin_trylock(lock)               spin_trylock(lock)
  98 #define cfs_spin_is_locked(lock)             spin_is_locked(lock)
  99
 100 #define cfs_spin_lock_irq(lock)              spin_lock_irq(lock)
 101 #define cfs_spin_unlock_irq(lock)            spin_unlock_irq(lock)
 102 #define cfs_read_lock_irqsave(lock, f)       read_lock_irqsave(lock, f)
 103 #define cfs_write_lock_irqsave(lock, f)      write_lock_irqsave(lock, f)
 104 #define cfs_write_unlock_irqrestore(lock, f) write_unlock_irqrestore(lock, f)
 105 #define cfs_spin_lock_irqsave(lock, f)       spin_lock_irqsave(lock, f)
 106 #define cfs_spin_unlock_irqrestore(lock, f)  spin_unlock_irqrestore(lock, f)
 107
 108 #define CFS_SPIN_LOCK_UNLOCKED               SPIN_LOCK_UNLOCKED
 109
 110 /*
 111  * rw_semaphore "implementation" (use Linux kernel's primitives)
 112  *
 113  * - sema_init(x)
 114  * - init_rwsem(x)
 115  * - down_read(x)
 116  * - up_read(x)
 117  * - down_write(x)
 118  * - up_write(x)
 119  */
 120 typedef struct rw_semaphore cfs_rw_semaphore_t;
 121
 122 #define cfs_init_rwsem(s)         init_rwsem(s)
 123 #define cfs_down_read(s)          down_read(s)
 124 #define cfs_down_read_trylock(s)  down_read_trylock(s)
 125 #define cfs_up_read(s)            up_read(s)
 126 #define cfs_down_write(s)         down_write(s)
 127 #define cfs_down_write_trylock(s) down_write_trylock(s)
 128 #define cfs_up_write(s)           up_write(s)
 129
 130 #define cfs_fini_rwsem(s)         do {} while(0)
 131
 132 #define CFS_DECLARE_RWSEM(name)   DECLARE_RWSEM(name)
 133
 134 /*
 135  * rwlock_t "implementation" (use Linux kernel's primitives)
 136  *
 137  * - rwlock_init(x)
 138  * - read_lock(x)
 139  * - read_unlock(x)
 140  * - write_lock(x)
 141  * - write_unlock(x)
 142  * - write_lock_bh(x)
 143  * - write_unlock_bh(x)
 144  *
 145  * - RW_LOCK_UNLOCKED
 146  */
 147 typedef rwlock_t cfs_rwlock_t;
 148
 149 #define cfs_rwlock_init(lock)                  rwlock_init(lock)
 150 #define cfs_read_lock(lock)                    read_lock(lock)
 151 #define cfs_read_unlock(lock)                  read_unlock(lock)
 152 #define cfs_read_unlock_irqrestore(lock,flags) \
 153         read_unlock_irqrestore(lock, flags)
 154 #define cfs_write_lock(lock)                   write_lock(lock)
 155 #define cfs_write_unlock(lock)                 write_unlock(lock)
 156 #define cfs_write_lock_bh(lock)                write_lock_bh(lock)
 157 #define cfs_write_unlock_bh(lock)              write_unlock_bh(lock)
 158
 159 #define CFS_RW_LOCK_UNLOCKED                   RW_LOCK_UNLOCKED
 160
 161 /*
 162  * completion "implementation" (use Linux kernel's primitives)
 163  *
 164  * - DECLARE_COMPLETION(work)
 165  * - INIT_COMPLETION(c)
 166  * - COMPLETION_INITIALIZER(work)
 167  * - init_completion(c)
 168  * - complete(c)
 169  * - wait_for_completion(c)
 170  * - wait_for_completion_interruptible(c)
 171  * - fini_completion(c)
 172  */
 173 typedef struct completion cfs_completion_t;
 174
 175 #define CFS_DECLARE_COMPLETION(work)             DECLARE_COMPLETION(work)
 176 #define CFS_INIT_COMPLETION(c)                   INIT_COMPLETION(c)
 177 #define CFS_COMPLETION_INITIALIZER(work)         COMPLETION_INITIALIZER(work)
 178 #define cfs_init_completion(c)                   init_completion(c)
 179 #define cfs_complete(c)                          complete(c)
 180 #define cfs_wait_for_completion(c)               wait_for_completion(c)
 181 #define cfs_wait_for_completion_interruptible(c) \
 182         wait_for_completion_interruptible(c)
 183 #define cfs_complete_and_exit(c, code)           complete_and_exit(c, code)
 184 #define cfs_fini_completion(c)                   do { } while (0)
 185
 186 /*
 187  * semaphore "implementation" (use Linux kernel's primitives)
 188  * - DEFINE_SEMAPHORE(name)
 189  * - sema_init(sem, val)
 190  * - up(sem)
 191  * - down(sem)
 192  * - down_interruptible(sem)
 193  * - down_trylock(sem)
 194  */
 195 typedef struct semaphore      cfs_semaphore_t;
 196
 197 #ifdef DEFINE_SEMAPHORE
 198 #define CFS_DEFINE_SEMAPHORE(name)          DEFINE_SEMAPHORE(name)
 199 #else
 200 #define CFS_DEFINE_SEMAPHORE(name)          DECLARE_MUTEX(name)
 201 #endif
 202
 203 #define cfs_sema_init(sem, val)             sema_init(sem, val)
 204 #define cfs_up(x)                           up(x)
 205 #define cfs_down(x)                         down(x)
 206 #define cfs_down_interruptible(x)           down_interruptible(x)
 207 #define cfs_down_trylock(x)                 down_trylock(x)
 208
 209 /*
 210  * mutex "implementation" (use Linux kernel's primitives)
 211  *
 212  * - DEFINE_MUTEX(name)
 213  * - mutex_init(x)
 214  * - mutex_lock(x)
 215  * - mutex_unlock(x)
 216  * - mutex_trylock(x)
 217  * - mutex_is_locked(x)
 218  * - mutex_destroy(x)
 219  */
 220 typedef struct mutex cfs_mutex_t;
 221
 222 #define CFS_DEFINE_MUTEX(name)             DEFINE_MUTEX(name)
 223
 224 #define cfs_mutex_init(x)                   mutex_init(x)
 225 #define cfs_mutex_lock(x)                   mutex_lock(x)
 226 #define cfs_mutex_unlock(x)                 mutex_unlock(x)
 227 #define cfs_mutex_lock_interruptible(x)     mutex_lock_interruptible(x)
 228 #define cfs_mutex_trylock(x)                mutex_trylock(x)
 229 #define cfs_mutex_is_locked(x)              mutex_is_locked(x)
 230 #define cfs_mutex_destroy(x)                mutex_destroy(x)
 231
 232 /*
 233  * Kernel locking primitives
 234  *
 235  * - lock_kernel
 236  * - unlock_kernel
 237  */
 238 #define cfs_lock_kernel()      lock_kernel()
 239 #define cfs_unlock_kernel()    unlock_kernel()
 240
 241 #ifndef lockdep_set_class
 242
 243 /**************************************************************************
 244  *
 245  * Lockdep "implementation". Also see liblustre.h
 246  *
 247  **************************************************************************/
 248
 249 typedef struct cfs_lock_class_key {
 250         ;
 251 } cfs_lock_class_key_t;
 252
 253 #define cfs_lockdep_set_class(lock, key) \
 254         do { (void)sizeof (lock);(void)sizeof (key); } while (0)
 255 /* This has to be a macro, so that `subclass' can be undefined in kernels that
 256  * do not support lockdep. */
 257
 258
 259 static inline void cfs_lockdep_off(void)
 260 {
 261 }
 262
 263 static inline void cfs_lockdep_on(void)
 264 {
 265 }
 266 #else
 267 typedef struct lock_class_key cfs_lock_class_key_t;
 268
 269 #define cfs_lockdep_set_class(lock, key) lockdep_set_class(lock, key)
 270 #define cfs_lockdep_off()                lockdep_off()
 271 #define cfs_lockdep_on()                 lockdep_on()
 272 #endif /* lockdep_set_class */
 273
 274 #ifndef CONFIG_DEBUG_LOCK_ALLOC
 275 #ifndef mutex_lock_nested
 276 #define cfs_mutex_lock_nested(mutex, subclass) mutex_lock(mutex)
 277 #else
 278 #define cfs_mutex_lock_nested(mutex, subclass) \
 279         mutex_lock_nested(mutex, subclass)
 280 #endif
 281
 282 #ifndef spin_lock_nested
 283 #define cfs_spin_lock_nested(lock, subclass) spin_lock(lock)
 284 #else
 285 #define cfs_spin_lock_nested(lock, subclass) spin_lock_nested(lock, subclass)
 286 #endif
 287
 288 #ifndef down_read_nested
 289 #define cfs_down_read_nested(lock, subclass) down_read(lock)
 290 #else
 291 #define cfs_down_read_nested(lock, subclass) down_read_nested(lock, subclass)
 292 #endif
 293
 294 #ifndef down_write_nested
 295 #define cfs_down_write_nested(lock, subclass) down_write(lock)
 296 #else
 297 #define cfs_down_write_nested(lock, subclass) down_write_nested(lock, subclass)
 298 #endif
 299 #else /* CONFIG_DEBUG_LOCK_ALLOC is defined */
 300 #define cfs_mutex_lock_nested(mutex, subclass) \
 301         mutex_lock_nested(mutex, subclass)
 302 #define cfs_spin_lock_nested(lock, subclass) spin_lock_nested(lock, subclass)
 303 #define cfs_down_read_nested(lock, subclass) down_read_nested(lock, subclass)
 304 #define cfs_down_write_nested(lock, subclass) down_write_nested(lock, subclass)
 305 #endif /* CONFIG_DEBUG_LOCK_ALLOC */
 306
 307
 308 #endif /* __LIBCFS_LINUX_CFS_LOCK_H__ */