/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* $FreeBSD: src/sys/msdosfs/fat.h,v 1.9 1999/12/29 04:54:53 peter Exp $ */ /* $NetBSD: fat.h,v 1.12 1997/11/17 15:36:36 ws Exp $ */ /*- * Copyright (C) 1994, 1997 Wolfgang Solfrank. * Copyright (C) 1994, 1997 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_RSRVD 0xfffffff6 /* reserved cluster range */ #define CLUST_BAD 0xfffffff7 /* a cluster with a defect */ #define CLUST_EOFS 0xfffffff8 /* start of eof cluster range */ #define CLUST_EOFE 0xffffffff /* end of eof cluster range */ /* * Note: FILENO_EMPTY must be larger than FAT32_MASK so that it can't accidentally * occur as a valid cluster number. */ #define FILENO_EMPTY 999999999 /* Fake file number used for empty files */ #define FILENO_ROOT 1 /* File number used for root directory of FAT12 and FAT16 */ #define FAT12_MASK 0x00000fff /* mask for 12 bit cluster numbers */ #define FAT16_MASK 0x0000ffff /* mask for 16 bit cluster numbers */ #define FAT32_MASK 0x0fffffff /* mask for FAT32 cluster numbers */ /* * MSDOSFS: * Return true if filesystem uses 12 bit fats. Microsoft Programmer's * Reference says if the maximum cluster number in a filesystem is greater * than 4078 ((CLUST_RSRVS - CLUST_FIRST) & FAT12_MASK) then we've got a * 16 bit fat filesystem. While mounting, the result of this test is stored * in pm_fatentrysize. * GEMDOS-flavour (atari): * 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. Note that this kind of * detection gets flakey when mounting a vnd-device. */ #define FAT12(pmp) (pmp->pm_fatmask == FAT12_MASK) #define FAT16(pmp) (pmp->pm_fatmask == FAT16_MASK) #define FAT32(pmp) (pmp->pm_fatmask == FAT32_MASK) #define MSDOSFSEOF(pmp, cn) ((((cn) | ~(pmp)->pm_fatmask) & CLUST_EOFS) == CLUST_EOFS) #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 */ #define DE_SYNC IO_SYNC /* 0x4 do it synchronisly...from vnode.h */ void msdosfs_fat_init(void); void msdosfs_fat_uninit(void); int msdosfs_fat_init_vol(struct msdosfsmount *pmp, vfs_context_t context); void msdosfs_fat_uninit_vol(struct msdosfsmount *pmp); int pcbmap __P((struct denode *dep, u_long findcn, u_long numclusters, daddr64_t *bnp, u_long *cnp, u_long *sp, vfs_context_t context)); int clusterfree __P((struct msdosfsmount *pmp, u_long cn, u_long *oldcnp, vfs_context_t context)); int clusteralloc __P((struct msdosfsmount *pmp, u_long start, u_long count, u_long fillwith, u_long *retcluster, u_long *got, vfs_context_t context)); int fatentry __P((int function, struct msdosfsmount *pmp, u_long cluster, u_long *oldcontents, u_long newcontents, vfs_context_t context)); int freeclusterchain __P((struct msdosfsmount *pmp, u_long startchain, vfs_context_t context)); int extendfile __P((struct denode *dep, u_long count, vfs_context_t context)); void fc_purge __P((struct denode *dep, u_int frcn)); /* [2753891] * Routine to mark a FAT16 or FAT32 volume as "clean" or "dirty" by manipulating the upper bit * of the FAT entry for cluster 1. Note that this bit is not defined for FAT12 volumes. */ int markvoldirty(struct msdosfsmount *pmp, int dirty, vfs_context_t context); enum vtype msdosfs_check_link(struct denode *dep, vfs_context_t context); #endif /* KERNEL */