sbin/fsck_msdosfs/dosfs.h

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
   5  * Copyright (c) 1995 Martin Husemann
   6  * Some structure declaration borrowed from Paul Popelka
   7  * (paulp@uts.amdahl.com), see /sys/msdosfs/ for reference.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *      $NetBSD: dosfs.h,v 1.4 1997/01/03 14:32:48 ws Exp $
  29  * $FreeBSD$
  30  */
  31
  32 #ifndef DOSFS_H
  33 #define DOSFS_H
  34
  35 /* support 4Kn disk reads */
  36 #define DOSBOOTBLOCKSIZE_REAL 512
  37 #define DOSBOOTBLOCKSIZE 4096
  38
  39 typedef uint32_t        cl_t;   /* type holding a cluster number */
  40
  41 /*
  42  * architecture independent description of all the info stored in a
  43  * FAT boot block.
  44  */
  45 struct bootblock {
  46         u_int   bpbBytesPerSec;         /* bytes per sector */
  47         u_int   bpbSecPerClust;         /* sectors per cluster */
  48         u_int   bpbResSectors;          /* number of reserved sectors */
  49         u_int   bpbFATs;                /* number of bpbFATs */
  50         u_int   bpbRootDirEnts;         /* number of root directory entries */
  51         uint32_t bpbSectors;            /* total number of sectors */
  52         u_int   bpbMedia;               /* media descriptor */
  53         u_int   bpbFATsmall;            /* number of sectors per FAT */
  54         u_int   SecPerTrack;            /* sectors per track */
  55         u_int   bpbHeads;               /* number of heads */
  56         uint32_t bpbHiddenSecs;         /* # of hidden sectors */
  57         uint32_t bpbHugeSectors;        /* # of sectors if bpbbpbSectors == 0 */
  58         cl_t    bpbRootClust;           /* Start of Root Directory */
  59         u_int   bpbFSInfo;              /* FSInfo sector */
  60         u_int   bpbBackup;              /* Backup of Bootblocks */
  61         cl_t    FSFree;                 /* Number of free clusters acc. FSInfo */
  62         cl_t    FSNext;                 /* Next free cluster acc. FSInfo */
  63
  64         /* and some more calculated values */
  65         u_int   flags;                  /* some flags: */
  66 #define FAT32           1               /* this is a FAT32 file system */
  67                                         /*
  68                                          * Maybe, we should separate out
  69                                          * various parts of FAT32?      XXX
  70                                          */
  71         int     ValidFat;               /* valid fat if FAT32 non-mirrored */
  72         cl_t    ClustMask;              /* mask for entries in FAT */
  73         cl_t    NumClusters;            /* # of entries in a FAT */
  74         uint32_t NumSectors;            /* how many sectors are there */
  75         uint32_t FATsecs;               /* how many sectors are in FAT */
  76         uint32_t NumFatEntries;         /* how many entries really are there */
  77         u_int   FirstCluster;           /* at what sector is Cluster CLUST_FIRST */
  78         u_int   ClusterSize;            /* Cluster size in bytes */
  79
  80         /* Now some statistics: */
  81         u_int   NumFiles;               /* # of plain files */
  82         u_int   NumFree;                /* # of free clusters */
  83         u_int   NumBad;                 /* # of bad clusters */
  84 };
  85
  86 #define CLUST_FREE      0               /* 0 means cluster is free */
  87 #define CLUST_FIRST     2               /* 2 is the minimum valid cluster number */
  88 #define CLUST_RSRVD     0xfffffff6      /* start of reserved clusters */
  89 #define CLUST_BAD       0xfffffff7      /* a cluster with a defect */
  90 #define CLUST_EOFS      0xfffffff8      /* start of EOF indicators */
  91 #define CLUST_EOF       0xffffffff      /* standard value for last cluster */
  92 #define CLUST_DEAD      0xfdeadc0d      /* error encountered */
  93
  94 /*
  95  * Masks for cluster values
  96  */
  97 #define CLUST12_MASK    0xfff
  98 #define CLUST16_MASK    0xffff
  99 #define CLUST32_MASK    0xfffffff
 100
 101 #define DOSLONGNAMELEN  256             /* long name maximal length */
 102 #define LRFIRST         0x40            /* first long name record */
 103 #define LRNOMASK        0x1f            /* mask to extract long record
 104                                          * sequence number */
 105
 106 /*
 107  * Architecture independent description of a directory entry
 108  */
 109 struct dosDirEntry {
 110         struct dosDirEntry
 111                 *parent,                /* previous tree level */
 112                 *next,                  /* next brother */
 113                 *child;                 /* if this is a directory */
 114         char name[8+1+3+1];             /* alias name first part */
 115         char lname[DOSLONGNAMELEN];     /* real name */
 116         uint flags;                     /* attributes */
 117         cl_t head;                      /* cluster no */
 118         uint32_t size;                  /* filesize in bytes */
 119         uint fsckflags;                 /* flags during fsck */
 120 };
 121 /* Flags in fsckflags: */
 122 #define DIREMPTY        1
 123 #define DIREMPWARN      2
 124
 125 /*
 126  *  TODO-list of unread directories
 127  */
 128 struct dirTodoNode {
 129         struct dosDirEntry *dir;
 130         struct dirTodoNode *next;
 131 };
 132
 133 #endif