120 lines
5.1 KiB
C
120 lines
5.1 KiB
C
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/* $NetBSD: fat.h,v 1.8 2013/01/26 00:21:49 christos Exp $ */
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/*-
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* Copyright (C) 1994, 1997 Wolfgang Solfrank.
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* Copyright (C) 1994, 1997 TooLs GmbH.
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* All rights reserved.
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* Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Written by Paul Popelka (paulp@uts.amdahl.com)
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*
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* You can do anything you want with this software, just don't say you wrote
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* it, and don't remove this notice.
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*
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* This software is provided "as is".
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*
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* The author supplies this software to be publicly redistributed on the
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* understanding that the author is not responsible for the correct
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* functioning of this software in any circumstances and is not liable for
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* any damages caused by this software.
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*
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* October 1992
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*/
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#ifndef _MSDOSFS_FAT_H_
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#define _MSDOSFS_FAT_H_
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/*
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* Some useful cluster numbers.
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*/
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#define MSDOSFSROOT 0 /* cluster 0 means the root dir */
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#define CLUST_FREE 0 /* cluster 0 also means a free cluster */
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#define MSDOSFSFREE CLUST_FREE
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#define CLUST_FIRST 2 /* first legal cluster number */
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#define CLUST_RSRVD 0xfffffff6 /* reserved cluster range */
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#define CLUST_BAD 0xfffffff7 /* a cluster with a defect */
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#define CLUST_EOFS 0xfffffff8 /* start of eof cluster range */
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#define CLUST_EOFE 0xffffffff /* end of eof cluster range */
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#define CLUST_END CLUST_EOFE /* bigger than any valid cluster */
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#define FAT12_MASK 0x00000fff /* mask for 12 bit cluster numbers */
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#define FAT16_MASK 0x0000ffff /* mask for 16 bit cluster numbers */
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#define FAT32_MASK 0x0fffffff /* mask for FAT32 cluster numbers */
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/*
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* MSDOSFS:
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* Return true if filesystem uses 12 bit FATs. Microsoft Programmer's
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* Reference says if the maximum cluster number in a filesystem is greater
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* than 4084 ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK) then we've got a
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* 16 bit FAT filesystem. While mounting, the result of this test is stored
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* in pm_fatentrysize.
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* GEMDOS-flavour (atari):
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* If the filesystem is on floppy we've got a 12 bit FAT filesystem, otherwise
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* 16 bit. We check the d_type field in the disklabel struct while mounting
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* and store the result in the pm_fatentrysize. Note that this kind of
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* detection gets flakey when mounting a vnd-device.
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*/
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#define FAT12(pmp) (pmp->pm_fatmask == FAT12_MASK)
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#define FAT16(pmp) (pmp->pm_fatmask == FAT16_MASK)
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#define FAT32(pmp) (pmp->pm_fatmask == FAT32_MASK)
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/*
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* M$ in it's unlimited wisdom desided that EOF mark is anything
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* between 0xfffffff8 and 0xffffffff (masked by appropriate fatmask,
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* of course).
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* Note that cn is supposed to be already adjusted accordingly to FAT type.
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*/
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#define MSDOSFSEOF(cn, fatmask) \
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(((cn) & CLUST_EOFS) == (CLUST_EOFS & (fatmask)))
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#if defined(_KERNEL) || defined(MAKEFS)
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/*
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* These are the values for the function argument to the function
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* fatentry().
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*/
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#define FAT_GET 0x0001 /* get a FAT entry */
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#define FAT_SET 0x0002 /* set a FAT entry */
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#define FAT_GET_AND_SET (FAT_GET | FAT_SET)
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/*
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* Flags to extendfile:
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*/
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#define DE_CLEAR 1 /* Zero out the blocks allocated */
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int pcbmap(struct denode *, u_long, daddr_t *, u_long *, int *);
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int clusterfree(struct msdosfsmount *, u_long, u_long *);
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int clusteralloc(struct msdosfsmount *, u_long, u_long,u_long *,u_long *);
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int extendfile(struct denode *, u_long, struct buf **, u_long *, int);
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int fatentry(int, struct msdosfsmount *, u_long, u_long *, u_long);
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void fc_purge(struct denode *, u_int);
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void fc_lookup(struct denode *, u_long, u_long *, u_long *);
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int fillinusemap(struct msdosfsmount *);
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int freeclusterchain(struct msdosfsmount *, u_long);
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#endif /* _KERNEL || MAKEFS */
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#endif /* _MSDOSFS_FAT_H_ */
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