Return to xfs_rtbit.c CVS log

Up to [Development] / xfs-linux-nodel

Undoes mod:     2.4.x-xfs:slinx:120155a
back out bitmap changes - it breaks recovery

/*
 * Copyright (c) 2000 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/
 */

/*
 * XFS bit manipulation routines, used only in realtime code.
 */

#include <xfs.h>

/*
 * xfs_lowbit32: get low bit set out of 32-bit argument, -1 if none set.
 */
int
xfs_lowbit32(
	__uint32_t	v)
{
	int		i;

	if (v & 0x0000ffff)
		if (v & 0x000000ff)
			i = 0;
		else
			i = 8;
	else if (v & 0xffff0000)
		if (v & 0x00ff0000)
			i = 16;
		else
			i = 24;
	else
		return -1;
	return i + xfs_lowbit[(v >> i) & 0xff];
}