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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2005-2019 Junjiro R. Okajima
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*
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* This program, aufs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* simple read-write semaphore wrappers
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*/
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#ifndef __AUFS_RWSEM_H__
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#define __AUFS_RWSEM_H__
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#ifdef __KERNEL__
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#include "debug.h"
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/* in the future, the name 'au_rwsem' will be totally gone */
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#define au_rwsem rw_semaphore
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/* to debug easier, do not make them inlined functions */
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#define AuRwMustNoWaiters(rw) AuDebugOn(rwsem_is_contended(rw))
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/* rwsem_is_locked() is unusable */
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#define AuRwMustReadLock(rw) AuDebugOn(IS_ENABLED(CONFIG_LOCKDEP) \
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&& !lockdep_recursing(current) \
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&& debug_locks \
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&& !lockdep_is_held_type(rw, 1))
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#define AuRwMustWriteLock(rw) AuDebugOn(IS_ENABLED(CONFIG_LOCKDEP) \
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&& !lockdep_recursing(current) \
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&& debug_locks \
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&& !lockdep_is_held_type(rw, 0))
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#define AuRwMustAnyLock(rw) AuDebugOn(IS_ENABLED(CONFIG_LOCKDEP) \
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&& !lockdep_recursing(current) \
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&& debug_locks \
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&& !lockdep_is_held(rw))
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#define AuRwDestroy(rw) AuDebugOn(IS_ENABLED(CONFIG_LOCKDEP) \
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&& !lockdep_recursing(current) \
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&& debug_locks \
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&& lockdep_is_held(rw))
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#define au_rw_init(rw) init_rwsem(rw)
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#define au_rw_init_wlock(rw) do { \
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au_rw_init(rw); \
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down_write(rw); \
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} while (0)
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#define au_rw_init_wlock_nested(rw, lsc) do { \
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au_rw_init(rw); \
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down_write_nested(rw, lsc); \
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} while (0)
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#define au_rw_read_lock(rw) down_read(rw)
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#define au_rw_read_lock_nested(rw, lsc) down_read_nested(rw, lsc)
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#define au_rw_read_unlock(rw) up_read(rw)
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#define au_rw_dgrade_lock(rw) downgrade_write(rw)
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#define au_rw_write_lock(rw) down_write(rw)
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#define au_rw_write_lock_nested(rw, lsc) down_write_nested(rw, lsc)
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#define au_rw_write_unlock(rw) up_write(rw)
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/* why is not _nested version defined? */
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#define au_rw_read_trylock(rw) down_read_trylock(rw)
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#define au_rw_write_trylock(rw) down_write_trylock(rw)
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#endif /* __KERNEL__ */
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#endif /* __AUFS_RWSEM_H__ */
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