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1 /*-
2  * Copyright (c) 2010 Isilon Systems, Inc.
3  * Copyright (c) 2010 iX Systems, Inc.
4  * Copyright (c) 2010 Panasas, Inc.
5  * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice unmodified, this list of conditions, and the following
13  *    disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  *
29  * $FreeBSD$
30  */
31 #ifndef _LINUX_RWLOCK_H_
32 #define _LINUX_RWLOCK_H_
33
34 #include <sys/types.h>
35 #include <sys/lock.h>
36 #include <sys/rwlock.h>
37 #include <sys/libkern.h>
38
39 typedef struct {
40         struct rwlock rw;
41 } rwlock_t;
42
43 #define read_lock(_l)           rw_rlock(&(_l)->rw)
44 #define write_lock(_l)          rw_wlock(&(_l)->rw)
45 #define read_unlock(_l)         rw_runlock(&(_l)->rw)
46 #define write_unlock(_l)        rw_wunlock(&(_l)->rw)
47 #define read_lock_irq(lock)     read_lock((lock))
48 #define read_unlock_irq(lock)   read_unlock((lock))
49 #define write_lock_irq(lock)    write_lock((lock))
50 #define write_unlock_irq(lock)  write_unlock((lock))
51 #define read_lock_irqsave(lock, flags)                                  \
52     do {(flags) = 0; read_lock(lock); } while (0)
53 #define write_lock_irqsave(lock, flags)                                 \
54     do {(flags) = 0; write_lock(lock); } while (0)
55 #define read_unlock_irqrestore(lock, flags)                             \
56     do { read_unlock(lock); } while (0)
57 #define write_unlock_irqrestore(lock, flags)                            \
58     do { write_unlock(lock); } while (0)
59
60 static inline void
61 rwlock_init(rwlock_t *lock)
62 {
63
64         memset(&lock->rw, 0, sizeof(lock->rw));
65         rw_init_flags(&lock->rw, "lnxrw", RW_NOWITNESS);
66 }
67
68 #endif  /* _LINUX_RWLOCK_H_ */