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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
commit03dd4cb26d967f9588437b0fc9cc0e8353322bb7 (patch)
treefa581f6dc1c0596391690d1f67eceef3af8246dc /fs/aufs/rwsem.h
parentd4e493caf788ef44982e131ff9c786546904d934 (diff)
Linux-libre 4.5-gnu
Diffstat (limited to 'fs/aufs/rwsem.h')
-rw-r--r--fs/aufs/rwsem.h178
1 files changed, 0 insertions, 178 deletions
diff --git a/fs/aufs/rwsem.h b/fs/aufs/rwsem.h
deleted file mode 100644
index ef50c2ccb..000000000
--- a/fs/aufs/rwsem.h
+++ /dev/null
@@ -1,178 +0,0 @@
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- */
-
-/*
- * 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__ */