1/*	$NetBSD: dosfs.h,v 1.5 1997/10/17 11:19:41 ws Exp $	*/
2
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/fs/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 */
29
30#ifndef DOSFS_H
31#define DOSFS_H
32
33#define DOSBOOTBLOCKSIZE 512
34
35typedef	u_int32_t	cl_t;	/* type holding a cluster number */
36
37/*
38 * architecture independent description of all the info stored in a
39 * FAT boot block.
40 */
41struct bootblock {
42	u_int	BytesPerSec;		/* bytes per sector */
43	u_int	SecPerClust;		/* sectors per cluster */
44	u_int	ResSectors;		/* number of reserved sectors */
45	u_int	FATs;			/* number of FATs */
46	u_int	RootDirEnts;		/* number of root directory entries */
47	u_int	Media;			/* media descriptor */
48	u_int	FATsmall;		/* number of sectors per FAT */
49	u_int	SecPerTrack;		/* sectors per track */
50	u_int	Heads;			/* number of heads */
51	u_int32_t Sectors;		/* total number of sectors */
52	u_int32_t HiddenSecs;		/* # of hidden sectors */
53	u_int32_t HugeSectors;		/* # of sectors if bpbSectors == 0 */
54	u_int	FSInfo;			/* FSInfo sector */
55	u_int	Backup;			/* Backup of Bootblocks */
56	cl_t	RootCl;			/* Start of Root Directory */
57	cl_t	FSFree;			/* Number of free clusters acc. FSInfo */
58	cl_t	FSNext;			/* Next free cluster acc. FSInfo */
59
60	/* and some more calculated values */
61	u_int	flags;			/* some flags: */
62#define	FAT32		1		/* this is a FAT32 filesystem */
63					/*
64					 * Maybe, we should separate out
65					 * various parts of FAT32?	XXX
66					 */
67	int	ValidFat;		/* valid fat if FAT32 non-mirrored */
68	cl_t	ClustMask;		/* mask for entries in FAT */
69	cl_t	NumClusters;		/* # of entries in a FAT */
70	u_int32_t NumSectors;		/* how many sectors are there */
71	u_int32_t FATsecs;		/* how many sectors are in FAT */
72	u_int32_t NumFatEntries;	/* how many entries really are there */
73	u_int	ClusterOffset;		/* at what sector would sector 0 start */
74	u_int	ClusterSize;		/* Cluster size in bytes */
75
76	/* Now some statistics: */
77	u_int	NumFiles;		/* # of plain files */
78	u_int	NumFree;		/* # of free clusters */
79	u_int	NumBad;			/* # of bad clusters */
80};
81
82struct fatEntry {
83	cl_t	next;			/* pointer to next cluster */
84	cl_t	head;			/* pointer to start of chain */
85	u_int32_t length;		/* number of clusters on chain */
86	int	flags;			/* see below */
87};
88
89#define	CLUST_FREE	0		/* 0 means cluster is free */
90#define	CLUST_FIRST	2		/* 2 is the minimum valid cluster number */
91#define	CLUST_RSRVD	0xfffffff6	/* start of reserved clusters */
92#define	CLUST_BAD	0xfffffff7	/* a cluster with a defect */
93#define	CLUST_EOFS	0xfffffff8	/* start of EOF indicators */
94#define	CLUST_EOF	0xffffffff	/* standard value for last cluster */
95
96/*
97 * Masks for cluster values
98 */
99#define	CLUST12_MASK	0xfff
100#define	CLUST16_MASK	0xffff
101#define	CLUST32_MASK	0xfffffff
102
103#define	FAT_USED	1		/* This fat chain is used in a file */
104
105#define	DOSLONGNAMELEN	256		/* long name maximal length */
106#define LRFIRST		0x40		/* first long name record */
107#define	LRNOMASK	0x1f		/* mask to extract long record
108					 * sequence number */
109
110/*
111 * Architecture independent description of a directory entry
112 */
113struct dosDirEntry {
114	struct dosDirEntry
115		*parent,		/* previous tree level */
116		*next,			/* next brother */
117		*child;			/* if this is a directory */
118	char name[8+1+3+1];		/* alias name first part */
119	char lname[DOSLONGNAMELEN];	/* real name */
120	uint flags;			/* attributes */
121	cl_t head;			/* cluster no */
122	u_int32_t size;			/* filesize in bytes */
123	uint fsckflags;			/* flags during fsck */
124};
125/* Flags in fsckflags: */
126#define	DIREMPTY	1
127#define	DIREMPWARN	2
128
129/*
130 *  TODO-list of unread directories
131 */
132struct dirTodoNode {
133	struct dosDirEntry *dir;
134	struct dirTodoNode *next;
135};
136
137#endif
138