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1 | /*****************************************************************************\ |
2 | * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC. | |
3 | * Copyright (C) 2007 The Regents of the University of California. | |
4 | * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). | |
5 | * Written by Brian Behlendorf <behlendorf1@llnl.gov>. | |
6 | * UCRL-CODE-235197 | |
7 | * | |
8 | * This file is part of the SPL, Solaris Porting Layer. | |
9 | * For details, see <http://zfsonlinux.org/>. | |
10 | * | |
11 | * The SPL is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
15 | * | |
16 | * The SPL is distributed in the hope that it will be useful, but WITHOUT | |
17 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
18 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
19 | * for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License along | |
22 | * with the SPL. If not, see <http://www.gnu.org/licenses/>. | |
23 | \*****************************************************************************/ | |
24 | ||
25 | #ifndef _SPL_RWSEM_COMPAT_H | |
26 | #define _SPL_RWSEM_COMPAT_H | |
27 | ||
28 | #include <linux/rwsem.h> | |
29 | ||
30 | #ifdef CONFIG_RWSEM_GENERIC_SPINLOCK | |
31 | #define SPL_RWSEM_SINGLE_READER_VALUE (1) | |
32 | #define SPL_RWSEM_SINGLE_WRITER_VALUE (-1) | |
33 | #else | |
34 | #define SPL_RWSEM_SINGLE_READER_VALUE (RWSEM_ACTIVE_READ_BIAS) | |
35 | #define SPL_RWSEM_SINGLE_WRITER_VALUE (RWSEM_ACTIVE_WRITE_BIAS) | |
36 | #endif | |
37 | ||
38 | /* Linux 3.16 changed activity to count for rwsem-spinlock */ | |
39 | #if defined(HAVE_RWSEM_ACTIVITY) | |
40 | #define RWSEM_COUNT(sem) sem->activity | |
41 | /* Linux 4.8 changed count to an atomic_long_t for !rwsem-spinlock */ | |
42 | #elif defined(HAVE_RWSEM_ATOMIC_LONG_COUNT) | |
43 | #define RWSEM_COUNT(sem) atomic_long_read(&(sem)->count) | |
44 | #else | |
45 | #define RWSEM_COUNT(sem) sem->count | |
46 | #endif | |
47 | ||
48 | int rwsem_tryupgrade(struct rw_semaphore *rwsem); | |
49 | ||
50 | #if defined(RWSEM_SPINLOCK_IS_RAW) | |
51 | #define spl_rwsem_lock_irqsave(lk, fl) raw_spin_lock_irqsave(lk, fl) | |
52 | #define spl_rwsem_unlock_irqrestore(lk, fl) raw_spin_unlock_irqrestore(lk, fl) | |
53 | #define spl_rwsem_trylock_irqsave(lk, fl) raw_spin_trylock_irqsave(lk, fl) | |
54 | #else | |
55 | #define spl_rwsem_lock_irqsave(lk, fl) spin_lock_irqsave(lk, fl) | |
56 | #define spl_rwsem_unlock_irqrestore(lk, fl) spin_unlock_irqrestore(lk, fl) | |
57 | #define spl_rwsem_trylock_irqsave(lk, fl) spin_trylock_irqsave(lk, fl) | |
58 | #endif /* RWSEM_SPINLOCK_IS_RAW */ | |
59 | ||
60 | #define spl_rwsem_is_locked(rwsem) rwsem_is_locked(rwsem) | |
61 | ||
62 | #endif /* _SPL_RWSEM_COMPAT_H */ |