diff options
Diffstat (limited to 'fs/aufs/rwsem.h')
| -rw-r--r-- | fs/aufs/rwsem.h | 191 |
1 files changed, 0 insertions, 191 deletions
diff --git a/fs/aufs/rwsem.h b/fs/aufs/rwsem.h deleted file mode 100644 index deb813f3e..000000000 --- a/fs/aufs/rwsem.h +++ /dev/null @@ -1,191 +0,0 @@ -/* - * Copyright (C) 2005-2015 Junjiro R. Okajima - * - * This program, aufs is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * 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 for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ - -/* - * simple read-write semaphore wrappers - */ - -#ifndef __AUFS_RWSEM_H__ -#define __AUFS_RWSEM_H__ - -#ifdef __KERNEL__ - -#include "debug.h" - -struct au_rwsem { - struct rw_semaphore rwsem; -#ifdef CONFIG_AUFS_DEBUG - /* just for debugging, not almighty counter */ - atomic_t rcnt, wcnt; -#endif -}; - -#ifdef CONFIG_AUFS_DEBUG -#define AuDbgCntInit(rw) do { \ - atomic_set(&(rw)->rcnt, 0); \ - atomic_set(&(rw)->wcnt, 0); \ - smp_mb(); /* atomic set */ \ -} while (0) - -#define AuDbgRcntInc(rw) atomic_inc(&(rw)->rcnt) -#define AuDbgRcntDec(rw) WARN_ON(atomic_dec_return(&(rw)->rcnt) < 0) -#define AuDbgWcntInc(rw) atomic_inc(&(rw)->wcnt) -#define AuDbgWcntDec(rw) WARN_ON(atomic_dec_return(&(rw)->wcnt) < 0) -#else -#define AuDbgCntInit(rw) do {} while (0) -#define AuDbgRcntInc(rw) do {} while (0) -#define AuDbgRcntDec(rw) do {} while (0) -#define AuDbgWcntInc(rw) do {} while (0) -#define AuDbgWcntDec(rw) do {} while (0) -#endif /* CONFIG_AUFS_DEBUG */ - -/* to debug easier, do not make them inlined functions */ -#define AuRwMustNoWaiters(rw) AuDebugOn(!list_empty(&(rw)->rwsem.wait_list)) -/* rwsem_is_locked() is unusable */ -#define AuRwMustReadLock(rw) AuDebugOn(atomic_read(&(rw)->rcnt) <= 0) -#define AuRwMustWriteLock(rw) AuDebugOn(atomic_read(&(rw)->wcnt) <= 0) -#define AuRwMustAnyLock(rw) AuDebugOn(atomic_read(&(rw)->rcnt) <= 0 \ - && atomic_read(&(rw)->wcnt) <= 0) -#define AuRwDestroy(rw) AuDebugOn(atomic_read(&(rw)->rcnt) \ - || atomic_read(&(rw)->wcnt)) - -#define au_rw_class(rw, key) lockdep_set_class(&(rw)->rwsem, key) - -static inline void au_rw_init(struct au_rwsem *rw) -{ - AuDbgCntInit(rw); - init_rwsem(&rw->rwsem); -} - -static inline void au_rw_init_wlock(struct au_rwsem *rw) -{ - au_rw_init(rw); - down_write(&rw->rwsem); - AuDbgWcntInc(rw); -} - -static inline void au_rw_init_wlock_nested(struct au_rwsem *rw, - unsigned int lsc) -{ - au_rw_init(rw); - down_write_nested(&rw->rwsem, lsc); - AuDbgWcntInc(rw); -} - -static inline void au_rw_read_lock(struct au_rwsem *rw) -{ - down_read(&rw->rwsem); - AuDbgRcntInc(rw); -} - -static inline void au_rw_read_lock_nested(struct au_rwsem *rw, unsigned int lsc) -{ - down_read_nested(&rw->rwsem, lsc); - AuDbgRcntInc(rw); -} - -static inline void au_rw_read_unlock(struct au_rwsem *rw) -{ - AuRwMustReadLock(rw); - AuDbgRcntDec(rw); - up_read(&rw->rwsem); -} - -static inline void au_rw_dgrade_lock(struct au_rwsem *rw) -{ - AuRwMustWriteLock(rw); - AuDbgRcntInc(rw); - AuDbgWcntDec(rw); - downgrade_write(&rw->rwsem); -} - -static inline void au_rw_write_lock(struct au_rwsem *rw) -{ - down_write(&rw->rwsem); - AuDbgWcntInc(rw); -} - -static inline void au_rw_write_lock_nested(struct au_rwsem *rw, - unsigned int lsc) -{ - down_write_nested(&rw->rwsem, lsc); - AuDbgWcntInc(rw); -} - -static inline void au_rw_write_unlock(struct au_rwsem *rw) -{ - AuRwMustWriteLock(rw); - AuDbgWcntDec(rw); - up_write(&rw->rwsem); -} - -/* why is not _nested version defined */ -static inline int au_rw_read_trylock(struct au_rwsem *rw) -{ - int ret; - - ret = down_read_trylock(&rw->rwsem); - if (ret) - AuDbgRcntInc(rw); - return ret; -} - -static inline int au_rw_write_trylock(struct au_rwsem *rw) -{ - int ret; - - ret = down_write_trylock(&rw->rwsem); - if (ret) - AuDbgWcntInc(rw); - return ret; -} - -#undef AuDbgCntInit -#undef AuDbgRcntInc -#undef AuDbgRcntDec -#undef AuDbgWcntInc -#undef AuDbgWcntDec - -#define AuSimpleLockRwsemFuncs(prefix, param, rwsem) \ -static inline void prefix##_read_lock(param) \ -{ au_rw_read_lock(rwsem); } \ -static inline void prefix##_write_lock(param) \ -{ au_rw_write_lock(rwsem); } \ -static inline int prefix##_read_trylock(param) \ -{ return au_rw_read_trylock(rwsem); } \ -static inline int prefix##_write_trylock(param) \ -{ return au_rw_write_trylock(rwsem); } -/* why is not _nested version defined */ -/* static inline void prefix##_read_trylock_nested(param, lsc) -{ au_rw_read_trylock_nested(rwsem, lsc)); } -static inline void prefix##_write_trylock_nestd(param, lsc) -{ au_rw_write_trylock_nested(rwsem, lsc); } */ - -#define AuSimpleUnlockRwsemFuncs(prefix, param, rwsem) \ -static inline void prefix##_read_unlock(param) \ -{ au_rw_read_unlock(rwsem); } \ -static inline void prefix##_write_unlock(param) \ -{ au_rw_write_unlock(rwsem); } \ -static inline void prefix##_downgrade_lock(param) \ -{ au_rw_dgrade_lock(rwsem); } - -#define AuSimpleRwsemFuncs(prefix, param, rwsem) \ - AuSimpleLockRwsemFuncs(prefix, param, rwsem) \ - AuSimpleUnlockRwsemFuncs(prefix, param, rwsem) - -#endif /* __KERNEL__ */ -#endif /* __AUFS_RWSEM_H__ */ |