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73 lines
2.4 KiB
73 lines
2.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright (C) 2005-2020 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(!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(!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(!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(!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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