diff options
Diffstat (limited to 'drivers/staging/lustre/include/linux/libcfs/linux/linux-lock.h')
| -rw-r--r-- | drivers/staging/lustre/include/linux/libcfs/linux/linux-lock.h | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/drivers/staging/lustre/include/linux/libcfs/linux/linux-lock.h b/drivers/staging/lustre/include/linux/libcfs/linux/linux-lock.h new file mode 100644 index 000000000000..6fbcbf3ab0d3 --- /dev/null +++ b/drivers/staging/lustre/include/linux/libcfs/linux/linux-lock.h @@ -0,0 +1,204 @@ +/* + * 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, + * Althought some of they 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__ */ |