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.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Martin Husemann
18 * and Wolfgang Solfrank.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * $NetBSD: dosfs.h,v 1.4 1997/01/03 14:32:48 ws Exp $
40 #define DOSBOOTBLOCKSIZE 512
42 typedef u_int32_t cl_t; /* type holding a cluster number */
45 * architecture independent description of all the info stored in a
49 u_int BytesPerSec; /* bytes per sector */
50 u_int SecPerClust; /* sectors per cluster */
51 u_int ResSectors; /* number of reserved sectors */
52 u_int FATs; /* number of FATs */
53 u_int RootDirEnts; /* number of root directory entries */
54 u_int Media; /* media descriptor */
55 u_int FATsmall; /* number of sectors per FAT */
56 u_int SecPerTrack; /* sectors per track */
57 u_int Heads; /* number of heads */
58 u_int32_t Sectors; /* total number of sectors */
59 u_int32_t HiddenSecs; /* # of hidden sectors */
60 u_int32_t HugeSectors; /* # of sectors if bpbSectors == 0 */
61 u_int FSInfo; /* FSInfo sector */
62 u_int Backup; /* Backup of Bootblocks */
63 cl_t RootCl; /* Start of Root Directory */
64 cl_t FSFree; /* Number of free clusters acc. FSInfo */
65 cl_t FSNext; /* Next free cluster acc. FSInfo */
67 /* and some more calculated values */
68 u_int flags; /* some flags: */
69 #define FAT32 1 /* this is a FAT32 file system */
71 * Maybe, we should separate out
72 * various parts of FAT32? XXX
74 int ValidFat; /* valid fat if FAT32 non-mirrored */
75 cl_t ClustMask; /* mask for entries in FAT */
76 cl_t NumClusters; /* # of entries in a FAT */
77 u_int32_t NumSectors; /* how many sectors are there */
78 u_int32_t FATsecs; /* how many sectors are in FAT */
79 u_int32_t NumFatEntries; /* how many entries really are there */
80 u_int ClusterOffset; /* at what sector would sector 0 start */
81 u_int ClusterSize; /* Cluster size in bytes */
83 /* Now some statistics: */
84 u_int NumFiles; /* # of plain files */
85 u_int NumFree; /* # of free clusters */
86 u_int NumBad; /* # of bad clusters */
90 cl_t next; /* pointer to next cluster */
91 cl_t head; /* pointer to start of chain */
92 u_int32_t length; /* number of clusters on chain */
93 int flags; /* see below */
96 #define CLUST_FREE 0 /* 0 means cluster is free */
97 #define CLUST_FIRST 2 /* 2 is the minimum valid cluster number */
98 #define CLUST_RSRVD 0xfffffff6 /* start of reserved clusters */
99 #define CLUST_BAD 0xfffffff7 /* a cluster with a defect */
100 #define CLUST_EOFS 0xfffffff8 /* start of EOF indicators */
101 #define CLUST_EOF 0xffffffff /* standard value for last cluster */
104 * Masks for cluster values
106 #define CLUST12_MASK 0xfff
107 #define CLUST16_MASK 0xffff
108 #define CLUST32_MASK 0xfffffff
110 #define FAT_USED 1 /* This fat chain is used in a file */
112 #define DOSLONGNAMELEN 256 /* long name maximal length */
113 #define LRFIRST 0x40 /* first long name record */
114 #define LRNOMASK 0x1f /* mask to extract long record
118 * Architecture independent description of a directory entry
122 *parent, /* previous tree level */
123 *next, /* next brother */
124 *child; /* if this is a directory */
125 char name[8+1+3+1]; /* alias name first part */
126 char lname[DOSLONGNAMELEN]; /* real name */
127 uint flags; /* attributes */
128 cl_t head; /* cluster no */
129 u_int32_t size; /* filesize in bytes */
130 uint fsckflags; /* flags during fsck */
132 /* Flags in fsckflags: */
137 * TODO-list of unread directories
140 struct dosDirEntry *dir;
141 struct dirTodoNode *next;