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rationalize locking code

/*
 * Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
 * Portions Copyright (c) 2002 Christoph Hellwig.  All Rights Reserved.
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 * 
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 * 
 * http://www.sgi.com 
 * 
 * For further information regarding this notice, see: 
 * 
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */
#ifndef __XFS_SUPPORT_MUTEX_H__
#define __XFS_SUPPORT_MUTEX_H__

#include <linux/spinlock.h>
#include <asm/semaphore.h>

/*
 * Map the mutex'es from IRIX to Linux semaphores.
 *
 * Destroy just simply initializes to -99 which should block all other
 * callers.
 */
#define MUTEX_DEFAULT		0x0
typedef struct semaphore	mutex_t;

#define mutex_init(lock, type, name)		sema_init(lock, 1)
#define init_mutex(ptr, type, name, sequence)	sema_init(lock, 1)
#define mutex_destroy(lock)			sema_init(lock, -99)
#define mutex_lock(lock, num)			down(lock)
#define mutex_trylock(lock)			(down_trylock(lock) ? 0 : 1)
#define mutex_unlock(lock)			up(lock)

#endif /* __XFS_SUPPORT_MUTEX_H__ */