| /*- |
| * SPDX-License-Identifier: BSD-2-Clause-FreeBSD |
| * |
| * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank |
| * Copyright (c) 1995 Martin Husemann |
| * Some structure declaration borrowed from Paul Popelka |
| * (paulp@uts.amdahl.com), see /sys/msdosfs/ for reference. |
| * |
| * 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 THE AUTHORS 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. |
| * $NetBSD: dosfs.h,v 1.4 1997/01/03 14:32:48 ws Exp $ |
| * $FreeBSD$ |
| */ |
| |
| #ifndef DOSFS_H |
| #define DOSFS_H |
| |
| /* support 4Kn disk reads */ |
| #define DOSBOOTBLOCKSIZE_REAL 512 |
| #define DOSBOOTBLOCKSIZE 4096 |
| |
| typedef u_int32_t cl_t; /* type holding a cluster number */ |
| |
| /* |
| * architecture independent description of all the info stored in a |
| * FAT boot block. |
| */ |
| struct bootblock { |
| u_int bpbBytesPerSec; /* bytes per sector */ |
| u_int bpbSecPerClust; /* sectors per cluster */ |
| u_int bpbResSectors; /* number of reserved sectors */ |
| u_int bpbFATs; /* number of bpbFATs */ |
| u_int bpbRootDirEnts; /* number of root directory entries */ |
| u_int32_t bpbSectors; /* total number of sectors */ |
| u_int bpbMedia; /* media descriptor */ |
| u_int bpbFATsmall; /* number of sectors per FAT */ |
| u_int SecPerTrack; /* sectors per track */ |
| u_int bpbHeads; /* number of heads */ |
| u_int32_t bpbHiddenSecs; /* # of hidden sectors */ |
| u_int32_t bpbHugeSectors; /* # of sectors if bpbbpbSectors == 0 */ |
| cl_t bpbRootClust; /* Start of Root Directory */ |
| u_int bpbFSInfo; /* FSInfo sector */ |
| u_int bpbBackup; /* Backup of Bootblocks */ |
| cl_t FSFree; /* Number of free clusters acc. FSInfo */ |
| cl_t FSNext; /* Next free cluster acc. FSInfo */ |
| |
| /* and some more calculated values */ |
| u_int flags; /* some flags: */ |
| #define FAT32 1 /* this is a FAT32 file system */ |
| /* |
| * Maybe, we should separate out |
| * various parts of FAT32? XXX |
| */ |
| int ValidFat; /* valid fat if FAT32 non-mirrored */ |
| cl_t ClustMask; /* mask for entries in FAT */ |
| cl_t NumClusters; /* # of entries in a FAT */ |
| u_int32_t NumSectors; /* how many sectors are there */ |
| u_int32_t FATsecs; /* how many sectors are in FAT */ |
| u_int32_t NumFatEntries; /* how many entries really are there */ |
| u_int FirstCluster; /* at what sector is Cluster CLUST_FIRST */ |
| u_int ClusterSize; /* Cluster size in bytes */ |
| |
| /* Now some statistics: */ |
| u_int NumFiles; /* # of plain files */ |
| u_int NumFree; /* # of free clusters */ |
| u_int NumBad; /* # of bad clusters */ |
| }; |
| |
| struct fatEntry { |
| cl_t next; /* pointer to next cluster */ |
| cl_t head; /* pointer to start of chain */ |
| u_int32_t length; /* number of clusters on chain */ |
| int flags; /* see below */ |
| }; |
| |
| #define CLUST_FREE 0 /* 0 means cluster is free */ |
| #define CLUST_FIRST 2 /* 2 is the minimum valid cluster number */ |
| #define CLUST_RSRVD 0xfffffff6 /* start of reserved clusters */ |
| #define CLUST_BAD 0xfffffff7 /* a cluster with a defect */ |
| #define CLUST_EOFS 0xfffffff8 /* start of EOF indicators */ |
| #define CLUST_EOF 0xffffffff /* standard value for last cluster */ |
| |
| /* |
| * Masks for cluster values |
| */ |
| #define CLUST12_MASK 0xfff |
| #define CLUST16_MASK 0xffff |
| #define CLUST32_MASK 0xfffffff |
| |
| #define FAT_USED 1 /* This fat chain is used in a file */ |
| |
| #define DOSLONGNAMELEN 256 /* long name maximal length */ |
| #define LRFIRST 0x40 /* first long name record */ |
| #define LRNOMASK 0x1f /* mask to extract long record |
| * sequence number */ |
| |
| /* |
| * Architecture independent description of a directory entry |
| */ |
| struct dosDirEntry { |
| struct dosDirEntry |
| *parent, /* previous tree level */ |
| *next, /* next brother */ |
| *child; /* if this is a directory */ |
| char name[8+1+3+1]; /* alias name first part */ |
| char lname[DOSLONGNAMELEN]; /* real name */ |
| uint flags; /* attributes */ |
| cl_t head; /* cluster no */ |
| u_int32_t size; /* filesize in bytes */ |
| uint fsckflags; /* flags during fsck */ |
| }; |
| /* Flags in fsckflags: */ |
| #define DIREMPTY 1 |
| #define DIREMPWARN 2 |
| |
| /* |
| * TODO-list of unread directories |
| */ |
| struct dirTodoNode { |
| struct dosDirEntry *dir; |
| struct dirTodoNode *next; |
| }; |
| |
| #endif |
