patch-2.4.27 linux-2.4.27/fs/xfs/linux/mrlock.h

• Lines: 88
• Date: 1969-12-31 16:00:00.000000000 -0800
• Orig file: linux-2.4.26/fs/xfs/linux/mrlock.h
• Orig date: 2004-02-18 05:36:31.000000000 -0800

diff -urN linux-2.4.26/fs/xfs/linux/mrlock.h linux-2.4.27/fs/xfs/linux/mrlock.h
@@ -1,87 +0,0 @@
-/*
- * Copyright (c) 2000-2003 Silicon Graphics, Inc.  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_MRLOCK_H__
-#define __XFS_SUPPORT_MRLOCK_H__
-
-#include <linux/time.h>
-#include <linux/wait.h>
-#include <asm/atomic.h>
-#include <asm/semaphore.h>
-
-/*
- * Implement mrlocks on Linux that work for XFS.
- *
- * These are sleep locks and not spinlocks. If one wants read/write spinlocks,
- * use read_lock, write_lock, ... see spinlock.h.
- */
-
-typedef struct mrlock_s {
-	int			mr_count;
-	unsigned short		mr_reads_waiting;
-	unsigned short		mr_writes_waiting;
-	wait_queue_head_t	mr_readerq;
-	wait_queue_head_t	mr_writerq;
-	spinlock_t		mr_lock;
-} mrlock_t;
-
-#define MR_ACCESS	1
-#define MR_UPDATE	2
-
-#define MRLOCK_BARRIER		0x1
-#define MRLOCK_ALLOW_EQUAL_PRI	0x8
-
-/*
- * mraccessf/mrupdatef take flags to be passed in while sleeping;
- * only PLTWAIT is currently supported.
- */
-
-extern void	mraccessf(mrlock_t *, int);
-extern void	mrupdatef(mrlock_t *, int);
-extern void     mrlock(mrlock_t *, int, int);
-extern void     mrunlock(mrlock_t *);
-extern void     mraccunlock(mrlock_t *);
-extern int      mrtryupdate(mrlock_t *);
-extern int      mrtryaccess(mrlock_t *);
-extern int	mrtrypromote(mrlock_t *);
-extern void     mrdemote(mrlock_t *);
-
-extern int	ismrlocked(mrlock_t *, int);
-extern void     mrlock_init(mrlock_t *, int type, char *name, long sequence);
-extern void     mrfree(mrlock_t *);
-
-#define mrinit(mrp, name)	mrlock_init(mrp, MRLOCK_BARRIER, name, -1)
-#define mraccess(mrp)		mraccessf(mrp, 0) /* grab for READ/ACCESS */
-#define mrupdate(mrp)		mrupdatef(mrp, 0) /* grab for WRITE/UPDATE */
-#define mrislocked_access(mrp)	((mrp)->mr_count > 0)
-#define mrislocked_update(mrp)	((mrp)->mr_count < 0)
-
-#endif /* __XFS_SUPPORT_MRLOCK_H__ */