1 /* 2 * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank 3 * Copyright (c) 1995 Martin Husemann 4 * Some structure declaration borrowed from Paul Popelka 5 * (paulp@uts.amdahl.com), see /sys/msdosfs/ for reference. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * $NetBSD: dosfs.h,v 1.4 1997/01/03 14:32:48 ws Exp $ 27 * $FreeBSD$ 28 */ 29 30 #ifndef DOSFS_H 31 #define DOSFS_H 32 33 /* support 4Kn disk reads */ 34 #define DOSBOOTBLOCKSIZE_REAL 512 35 #define DOSBOOTBLOCKSIZE 4096 36 37 typedef u_int32_t cl_t; /* type holding a cluster number */ 38 39 /* 40 * architecture independent description of all the info stored in a 41 * FAT boot block. 42 */ 43 struct bootblock { 44 u_int bpbBytesPerSec; /* bytes per sector */ 45 u_int bpbSecPerClust; /* sectors per cluster */ 46 u_int bpbResSectors; /* number of reserved sectors */ 47 u_int bpbFATs; /* number of bpbFATs */ 48 u_int bpbRootDirEnts; /* number of root directory entries */ 49 u_int32_t bpbSectors; /* total number of sectors */ 50 u_int bpbMedia; /* media descriptor */ 51 u_int bpbFATsmall; /* number of sectors per FAT */ 52 u_int SecPerTrack; /* sectors per track */ 53 u_int bpbHeads; /* number of heads */ 54 u_int32_t bpbHiddenSecs; /* # of hidden sectors */ 55 u_int32_t bpbHugeSectors; /* # of sectors if bpbbpbSectors == 0 */ 56 cl_t bpbRootClust; /* Start of Root Directory */ 57 u_int bpbFSInfo; /* FSInfo sector */ 58 u_int bpbBackup; /* Backup of Bootblocks */ 59 cl_t FSFree; /* Number of free clusters acc. FSInfo */ 60 cl_t FSNext; /* Next free cluster acc. FSInfo */ 61 62 /* and some more calculated values */ 63 u_int flags; /* some flags: */ 64 #define FAT32 1 /* this is a FAT32 file system */ 65 /* 66 * Maybe, we should separate out 67 * various parts of FAT32? XXX 68 */ 69 int ValidFat; /* valid fat if FAT32 non-mirrored */ 70 cl_t ClustMask; /* mask for entries in FAT */ 71 cl_t NumClusters; /* # of entries in a FAT */ 72 u_int32_t NumSectors; /* how many sectors are there */ 73 u_int32_t FATsecs; /* how many sectors are in FAT */ 74 u_int32_t NumFatEntries; /* how many entries really are there */ 75 u_int ClusterOffset; /* at what sector would sector 0 start */ 76 u_int ClusterSize; /* Cluster size in bytes */ 77 78 /* Now some statistics: */ 79 u_int NumFiles; /* # of plain files */ 80 u_int NumFree; /* # of free clusters */ 81 u_int NumBad; /* # of bad clusters */ 82 }; 83 84 struct fatEntry { 85 cl_t next; /* pointer to next cluster */ 86 cl_t head; /* pointer to start of chain */ 87 u_int32_t length; /* number of clusters on chain */ 88 int flags; /* see below */ 89 }; 90 91 #define CLUST_FREE 0 /* 0 means cluster is free */ 92 #define CLUST_FIRST 2 /* 2 is the minimum valid cluster number */ 93 #define CLUST_RSRVD 0xfffffff6 /* start of reserved clusters */ 94 #define CLUST_BAD 0xfffffff7 /* a cluster with a defect */ 95 #define CLUST_EOFS 0xfffffff8 /* start of EOF indicators */ 96 #define CLUST_EOF 0xffffffff /* standard value for last cluster */ 97 98 /* 99 * Masks for cluster values 100 */ 101 #define CLUST12_MASK 0xfff 102 #define CLUST16_MASK 0xffff 103 #define CLUST32_MASK 0xfffffff 104 105 #define FAT_USED 1 /* This fat chain is used in a file */ 106 107 #define DOSLONGNAMELEN 256 /* long name maximal length */ 108 #define LRFIRST 0x40 /* first long name record */ 109 #define LRNOMASK 0x1f /* mask to extract long record 110 * sequence number */ 111 112 /* 113 * Architecture independent description of a directory entry 114 */ 115 struct dosDirEntry { 116 struct dosDirEntry 117 *parent, /* previous tree level */ 118 *next, /* next brother */ 119 *child; /* if this is a directory */ 120 char name[8+1+3+1]; /* alias name first part */ 121 char lname[DOSLONGNAMELEN]; /* real name */ 122 uint flags; /* attributes */ 123 cl_t head; /* cluster no */ 124 u_int32_t size; /* filesize in bytes */ 125 uint fsckflags; /* flags during fsck */ 126 }; 127 /* Flags in fsckflags: */ 128 #define DIREMPTY 1 129 #define DIREMPWARN 2 130 131 /* 132 * TODO-list of unread directories 133 */ 134 struct dirTodoNode { 135 struct dosDirEntry *dir; 136 struct dirTodoNode *next; 137 }; 138 139 #endif 140