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Diffstat (limited to 'include/os/linux/spl/sys/rwlock.h')
| -rw-r--r-- | include/os/linux/spl/sys/rwlock.h | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/include/os/linux/spl/sys/rwlock.h b/include/os/linux/spl/sys/rwlock.h deleted file mode 100644 index c883836c2f83..000000000000 --- a/include/os/linux/spl/sys/rwlock.h +++ /dev/null @@ -1,199 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC. - * Copyright (C) 2007 The Regents of the University of California. - * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). - * Written by Brian Behlendorf <behlendorf1@llnl.gov>. - * UCRL-CODE-235197 - * - * This file is part of the SPL, Solaris Porting Layer. - * - * The SPL 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. - * - * The SPL 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 the SPL. If not, see <http://www.gnu.org/licenses/>. - */ - -#ifndef _SPL_RWLOCK_H -#define _SPL_RWLOCK_H - -#include <sys/types.h> -#include <linux/rwsem.h> -#include <linux/sched.h> - -typedef enum { - RW_DRIVER = 2, - RW_DEFAULT = 4, - RW_NOLOCKDEP = 5 -} krw_type_t; - -typedef enum { - RW_NONE = 0, - RW_WRITER = 1, - RW_READER = 2 -} krw_t; - -typedef struct { - struct rw_semaphore rw_rwlock; - kthread_t *rw_owner; -#ifdef CONFIG_LOCKDEP - krw_type_t rw_type; -#endif /* CONFIG_LOCKDEP */ -} krwlock_t; - -#define SEM(rwp) (&(rwp)->rw_rwlock) - -static inline void -spl_rw_set_owner(krwlock_t *rwp) -{ - rwp->rw_owner = current; -} - -static inline void -spl_rw_clear_owner(krwlock_t *rwp) -{ - rwp->rw_owner = NULL; -} - -static inline kthread_t * -rw_owner(krwlock_t *rwp) -{ - return (rwp->rw_owner); -} - -#ifdef CONFIG_LOCKDEP -static inline void -spl_rw_set_type(krwlock_t *rwp, krw_type_t type) -{ - rwp->rw_type = type; -} -static inline void -spl_rw_lockdep_off_maybe(krwlock_t *rwp) \ -{ \ - if (rwp && rwp->rw_type == RW_NOLOCKDEP) \ - lockdep_off(); \ -} -static inline void -spl_rw_lockdep_on_maybe(krwlock_t *rwp) \ -{ \ - if (rwp && rwp->rw_type == RW_NOLOCKDEP) \ - lockdep_on(); \ -} -#else /* CONFIG_LOCKDEP */ -#define spl_rw_set_type(rwp, type) -#define spl_rw_lockdep_off_maybe(rwp) -#define spl_rw_lockdep_on_maybe(rwp) -#endif /* CONFIG_LOCKDEP */ - -static inline int -RW_LOCK_HELD(krwlock_t *rwp) -{ - return (rwsem_is_locked(SEM(rwp))); -} - -static inline int -RW_WRITE_HELD(krwlock_t *rwp) -{ - return (rw_owner(rwp) == current); -} - -static inline int -RW_READ_HELD(krwlock_t *rwp) -{ - return (RW_LOCK_HELD(rwp) && rw_owner(rwp) == NULL); -} - -/* - * The following functions must be a #define and not static inline. - * This ensures that the native linux semaphore functions (down/up) - * will be correctly located in the users code which is important - * for the built in kernel lock analysis tools - */ -#define rw_init(rwp, name, type, arg) /* CSTYLED */ \ -({ \ - static struct lock_class_key __key; \ - ASSERT(type == RW_DEFAULT || type == RW_NOLOCKDEP); \ - \ - __init_rwsem(SEM(rwp), #rwp, &__key); \ - spl_rw_clear_owner(rwp); \ - spl_rw_set_type(rwp, type); \ -}) - -/* - * The Linux rwsem implementation does not require a matching destroy. - */ -#define rw_destroy(rwp) ASSERT(!(RW_LOCK_HELD(rwp))) - -/* - * Upgrading a rwsem from a reader to a writer is not supported by the - * Linux kernel. The lock must be dropped and reacquired as a writer. - */ -#define rw_tryupgrade(rwp) RW_WRITE_HELD(rwp) - -#define rw_tryenter(rwp, rw) /* CSTYLED */ \ -({ \ - int _rc_ = 0; \ - \ - spl_rw_lockdep_off_maybe(rwp); \ - switch (rw) { \ - case RW_READER: \ - _rc_ = down_read_trylock(SEM(rwp)); \ - break; \ - case RW_WRITER: \ - if ((_rc_ = down_write_trylock(SEM(rwp)))) \ - spl_rw_set_owner(rwp); \ - break; \ - default: \ - VERIFY(0); \ - } \ - spl_rw_lockdep_on_maybe(rwp); \ - _rc_; \ -}) - -#define rw_enter(rwp, rw) /* CSTYLED */ \ -({ \ - spl_rw_lockdep_off_maybe(rwp); \ - switch (rw) { \ - case RW_READER: \ - down_read(SEM(rwp)); \ - break; \ - case RW_WRITER: \ - down_write(SEM(rwp)); \ - spl_rw_set_owner(rwp); \ - break; \ - default: \ - VERIFY(0); \ - } \ - spl_rw_lockdep_on_maybe(rwp); \ -}) - -#define rw_exit(rwp) /* CSTYLED */ \ -({ \ - spl_rw_lockdep_off_maybe(rwp); \ - if (RW_WRITE_HELD(rwp)) { \ - spl_rw_clear_owner(rwp); \ - up_write(SEM(rwp)); \ - } else { \ - ASSERT(RW_READ_HELD(rwp)); \ - up_read(SEM(rwp)); \ - } \ - spl_rw_lockdep_on_maybe(rwp); \ -}) - -#define rw_downgrade(rwp) /* CSTYLED */ \ -({ \ - spl_rw_lockdep_off_maybe(rwp); \ - spl_rw_clear_owner(rwp); \ - downgrade_write(SEM(rwp)); \ - spl_rw_lockdep_on_maybe(rwp); \ -}) - -#endif /* _SPL_RWLOCK_H */ |