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/* $NetBSD: fat.h,v 1.8 1995/09/09 19:38:01 ws Exp $ */
/*-
* Copyright (C) 1994 Wolfgang Solfrank.
* Copyright (C) 1994 TooLs GmbH.
* All rights reserved.
* Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Written by Paul Popelka (paulp@uts.amdahl.com)
*
* You can do anything you want with this software, just don't say you wrote
* it, and don't remove this notice.
*
* This software is provided "as is".
*
* The author supplies this software to be publicly redistributed on the
* understanding that the author is not responsible for the correct
* functioning of this software in any circumstances and is not liable for
* any damages caused by this software.
*
* October 1992
*/
/*
* Some useful cluster numbers.
*/
#define MSDOSFSROOT 0 /* cluster 0 means the root dir */
#define CLUST_FREE 0 /* cluster 0 also means a free cluster */
#define MSDOSFSFREE CLUST_FREE
#define CLUST_FIRST 2 /* first legal cluster number */
#define CLUST_RSRVS 0xfff0 /* start of reserved cluster range */
#define CLUST_RSRVE 0xfff6 /* end of reserved cluster range */
#define CLUST_BAD 0xfff7 /* a cluster with a defect */
#define CLUST_EOFS 0xfff8 /* start of eof cluster range */
#define CLUST_EOFE 0xffff /* end of eof cluster range */
#define FAT12_MASK 0x0fff /* mask for 12 bit cluster numbers */
#define FAT16_MASK 0xffff /* mask for 16 bit cluster numbers */
#ifdef atari
/*
* Return true if filesystem uses 12 bit fats. If the filesystem
* is on floppy we've got a 12 bit fat filesystem, otherwise 16 bit.
* We check the d_type field in the disklabel struct while mounting
* and store the result in the pm_fatentrysize field in the
* msdosfsmount struct.
*/
#define FAT12(pmp) (pmp->pm_fatentrysize == 12)
#define FAT16(pmp) (pmp->pm_fatentrysize == 16)
#else /* !atari */
/*
* Return true if filesystem uses 12 bit fats. Microsoft Programmer's
* Reference says if the maximum cluster number in a filesystem is greater
* than 4086 then we've got a 16 bit fat filesystem.
*/
#define FAT12(pmp) (pmp->pm_maxcluster <= 4086)
#define FAT16(pmp) (pmp->pm_maxcluster > 4086)
#endif /* !atari */
#define MSDOSFSEOF(cn) (((cn) & 0xfff8) == 0xfff8)
#ifdef _KERNEL
/*
* These are the values for the function argument to the function
* fatentry().
*/
#define FAT_GET 0x0001 /* get a fat entry */
#define FAT_SET 0x0002 /* set a fat entry */
#define FAT_GET_AND_SET (FAT_GET | FAT_SET)
/*
* Flags to extendfile:
*/
#define DE_CLEAR 1 /* Zero out the blocks allocated */
int pcbmap __P((struct denode *, u_long, daddr_t *, u_long *, int *));
int clusterfree __P((struct msdosfsmount *, u_long, u_long *));
int clusteralloc __P((struct msdosfsmount *, u_long, u_long, u_long, u_long *, u_long *));
int extendfile __P((struct denode *, u_long, struct buf **, u_long *, int));
int fatentry __P((int, struct msdosfsmount *, u_long, u_long *, u_long));
void fc_purge __P((struct denode *, u_int));
void fc_lookup __P((struct denode *, u_long, u_long *, u_long *));
int fillinusemap __P((struct msdosfsmount *));
int freeclusterchain __P((struct msdosfsmount *, u_long));
#endif /* _KERNEL */
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