sbin/fsck_msdosfs/dosfs.h

   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