| /* |
| * GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License version 2 for more details (a copy is included |
| * in the LICENSE file that accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see |
| * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| * |
| * Copyright (c) 2012, Intel Corporation. |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| * |
| * libcfs/include/libcfs/linux/linux-lock.h |
| * |
| * Basic library routines. |
| */ |
| |
| #ifndef __LIBCFS_LINUX_CFS_LOCK_H__ |
| #define __LIBCFS_LINUX_CFS_LOCK_H__ |
| |
| #ifndef __LIBCFS_LIBCFS_H__ |
| #error Do not #include this file directly. #include <linux/libcfs/libcfs.h> instead |
| #endif |
| |
| |
| #include <linux/mutex.h> |
| |
| /* |
| * IMPORTANT !!!!!!!! |
| * |
| * All locks' declaration are not guaranteed to be initialized, |
| * although some of them are initialized in Linux. All locks |
| * declared by CFS_DECL_* should be initialized explicitly. |
| */ |
| |
| /* |
| * spin_lock "implementation" (use Linux kernel's primitives) |
| * |
| * - spin_lock_init(x) |
| * - spin_lock(x) |
| * - spin_lock_bh(x) |
| * - spin_lock_bh_init(x) |
| * - spin_unlock(x) |
| * - spin_unlock_bh(x) |
| * - spin_trylock(x) |
| * - spin_is_locked(x) |
| * |
| * - spin_lock_irq(x) |
| * - spin_lock_irqsave(x, f) |
| * - spin_unlock_irqrestore(x, f) |
| * - read_lock_irqsave(lock, f) |
| * - write_lock_irqsave(lock, f) |
| * - write_unlock_irqrestore(lock, f) |
| */ |
| |
| /* |
| * spinlock "implementation" |
| */ |
| |
| |
| |
| |
| /* |
| * rw_semaphore "implementation" (use Linux kernel's primitives) |
| * |
| * - sema_init(x) |
| * - init_rwsem(x) |
| * - down_read(x) |
| * - up_read(x) |
| * - down_write(x) |
| * - up_write(x) |
| */ |
| |
| |
| #define fini_rwsem(s) do {} while (0) |
| |
| |
| /* |
| * rwlock_t "implementation" (use Linux kernel's primitives) |
| * |
| * - rwlock_init(x) |
| * - read_lock(x) |
| * - read_unlock(x) |
| * - write_lock(x) |
| * - write_unlock(x) |
| * - write_lock_bh(x) |
| * - write_unlock_bh(x) |
| * |
| * - RW_LOCK_UNLOCKED |
| */ |
| |
| |
| #ifndef DEFINE_RWLOCK |
| #define DEFINE_RWLOCK(lock) rwlock_t lock = __RW_LOCK_UNLOCKED(lock) |
| #endif |
| |
| /* |
| * completion "implementation" (use Linux kernel's primitives) |
| * |
| * - DECLARE_COMPLETION(work) |
| * - INIT_COMPLETION(c) |
| * - COMPLETION_INITIALIZER(work) |
| * - init_completion(c) |
| * - complete(c) |
| * - wait_for_completion(c) |
| * - wait_for_completion_interruptible(c) |
| * - fini_completion(c) |
| */ |
| #define fini_completion(c) do { } while (0) |
| |
| /* |
| * semaphore "implementation" (use Linux kernel's primitives) |
| * - DEFINE_SEMAPHORE(name) |
| * - sema_init(sem, val) |
| * - up(sem) |
| * - down(sem) |
| * - down_interruptible(sem) |
| * - down_trylock(sem) |
| */ |
| |
| /* |
| * mutex "implementation" (use Linux kernel's primitives) |
| * |
| * - DEFINE_MUTEX(name) |
| * - mutex_init(x) |
| * - mutex_lock(x) |
| * - mutex_unlock(x) |
| * - mutex_trylock(x) |
| * - mutex_is_locked(x) |
| * - mutex_destroy(x) |
| */ |
| |
| #ifndef lockdep_set_class |
| |
| /************************************************************************** |
| * |
| * Lockdep "implementation". Also see liblustre.h |
| * |
| **************************************************************************/ |
| |
| struct lock_class_key { |
| ; |
| }; |
| |
| #define lockdep_set_class(lock, key) \ |
| do { (void)sizeof(lock); (void)sizeof(key); } while (0) |
| /* This has to be a macro, so that `subclass' can be undefined in kernels |
| * that do not support lockdep. */ |
| |
| |
| static inline void lockdep_off(void) |
| { |
| } |
| |
| static inline void lockdep_on(void) |
| { |
| } |
| #else |
| |
| #endif /* lockdep_set_class */ |
| |
| #ifndef CONFIG_DEBUG_LOCK_ALLOC |
| #ifndef mutex_lock_nested |
| #define mutex_lock_nested(mutex, subclass) mutex_lock(mutex) |
| #endif |
| |
| #ifndef spin_lock_nested |
| #define spin_lock_nested(lock, subclass) spin_lock(lock) |
| #endif |
| |
| #ifndef down_read_nested |
| #define down_read_nested(lock, subclass) down_read(lock) |
| #endif |
| |
| #ifndef down_write_nested |
| #define down_write_nested(lock, subclass) down_write(lock) |
| #endif |
| #endif /* CONFIG_DEBUG_LOCK_ALLOC */ |
| |
| |
| #endif /* __LIBCFS_LINUX_CFS_LOCK_H__ */ |
