mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 02:50:53 +07:00
78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2005-2019 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"
|
||
|
|
|
||
|
|
/* in the future, the name 'au_rwsem' will be totally gone */
|
||
|
|
#define au_rwsem rw_semaphore
|
||
|
|
|
||
|
|
/* to debug easier, do not make them inlined functions */
|
||
|
|
#define AuRwMustNoWaiters(rw) AuDebugOn(rwsem_is_contended(rw))
|
||
|
|
/* rwsem_is_locked() is unusable */
|
||
|
|
#define AuRwMustReadLock(rw) AuDebugOn(IS_ENABLED(CONFIG_LOCKDEP) \
|
||
|
|
&& !lockdep_recursing(current) \
|
||
|
|
&& debug_locks \
|
||
|
|
&& !lockdep_is_held_type(rw, 1))
|
||
|
|
#define AuRwMustWriteLock(rw) AuDebugOn(IS_ENABLED(CONFIG_LOCKDEP) \
|
||
|
|
&& !lockdep_recursing(current) \
|
||
|
|
&& debug_locks \
|
||
|
|
&& !lockdep_is_held_type(rw, 0))
|
||
|
|
#define AuRwMustAnyLock(rw) AuDebugOn(IS_ENABLED(CONFIG_LOCKDEP) \
|
||
|
|
&& !lockdep_recursing(current) \
|
||
|
|
&& debug_locks \
|
||
|
|
&& !lockdep_is_held(rw))
|
||
|
|
#define AuRwDestroy(rw) AuDebugOn(IS_ENABLED(CONFIG_LOCKDEP) \
|
||
|
|
&& !lockdep_recursing(current) \
|
||
|
|
&& debug_locks \
|
||
|
|
&& lockdep_is_held(rw))
|
||
|
|
|
||
|
|
#define au_rw_init(rw) init_rwsem(rw)
|
||
|
|
|
||
|
|
#define au_rw_init_wlock(rw) do { \
|
||
|
|
au_rw_init(rw); \
|
||
|
|
down_write(rw); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#define au_rw_init_wlock_nested(rw, lsc) do { \
|
||
|
|
au_rw_init(rw); \
|
||
|
|
down_write_nested(rw, lsc); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#define au_rw_read_lock(rw) down_read(rw)
|
||
|
|
#define au_rw_read_lock_nested(rw, lsc) down_read_nested(rw, lsc)
|
||
|
|
#define au_rw_read_unlock(rw) up_read(rw)
|
||
|
|
#define au_rw_dgrade_lock(rw) downgrade_write(rw)
|
||
|
|
#define au_rw_write_lock(rw) down_write(rw)
|
||
|
|
#define au_rw_write_lock_nested(rw, lsc) down_write_nested(rw, lsc)
|
||
|
|
#define au_rw_write_unlock(rw) up_write(rw)
|
||
|
|
/* why is not _nested version defined? */
|
||
|
|
#define au_rw_read_trylock(rw) down_read_trylock(rw)
|
||
|
|
#define au_rw_write_trylock(rw) down_write_trylock(rw)
|
||
|
|
|
||
|
|
#endif /* __KERNEL__ */
|
||
|
|
#endif /* __AUFS_RWSEM_H__ */
|