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_ */ 69