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dosfs.h
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/*
* Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
* Copyright (c) 1995 Martin Husemann
* Some structure declaration borrowed from Paul Popelka
* ([email protected]), see /sys/msdosfs/ for reference.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Martin Husemann
* and Wolfgang Solfrank.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* $NetBSD: dosfs.h,v 1.4 1997/01/03 14:32:48 ws Exp $
* $FreeBSD: src/sbin/fsck_msdosfs/dosfs.h,v 1.3 2003/12/26 17:24:37 trhodes Exp $
*/
#ifndef DOSFS_H
#define DOSFS_H
#define DOSBOOTBLOCKSIZE 512
#include "tree.h"
typedef unsigned int cl_t; /* type holding a cluster number */
typedef unsigned int u_int;
typedef unsigned int u_int32_t;
/*
* architecture independent description of all the info stored in a
* FAT boot block.
*/
struct bootblock {
u_int BytesPerSec; /* bytes per sector */
u_int SecPerClust; /* sectors per cluster */
u_int ResSectors; /* number of reserved sectors */
u_int FATs; /* number of FATs */
u_int RootDirEnts; /* number of root directory entries */
u_int Media; /* media descriptor */
u_int FATsmall; /* number of sectors per FAT */
u_int SecPerTrack; /* sectors per track */
u_int Heads; /* number of heads */
u_int32_t Sectors; /* total number of sectors */
u_int32_t HiddenSecs; /* # of hidden sectors */
u_int32_t HugeSectors; /* # of sectors if bpbSectors == 0 */
u_int FSInfo; /* FSInfo sector */
u_int Backup; /* Backup of Bootblocks */
cl_t RootCl; /* Start of Root Directory */
cl_t FSFree; /* Number of free clusters acc. FSInfo */
cl_t FSNext; /* Next free cluster acc. FSInfo */
/* and some more calculated values */
u_int flags; /* some flags: */
#define FAT32 1 /* this is a FAT32 file system */
/*
* Maybe, we should separate out
* various parts of FAT32? XXX
*/
int ValidFat; /* valid fat if FAT32 non-mirrored */
cl_t ClustMask; /* mask for entries in FAT */
cl_t NumClusters; /* # of entries in a FAT */
u_int32_t NumSectors; /* how many sectors are there */
u_int32_t FATsecs; /* how many sectors are in FAT */
u_int32_t NumFatEntries; /* how many entries really are there */
u_int ClusterOffset; /* at what sector would sector 0 start */
u_int ClusterSize; /* Cluster size in bytes */
/* Now some statistics: */
u_int NumFiles; /* # of plain files */
u_int NumFree; /* # of free clusters */
u_int NumBad; /* # of bad clusters */
};
struct fatcache {
struct fatcache *next;
cl_t head;
u_int32_t length;
};
struct cluster_chain_descriptor {
struct fatcache* child;
cl_t head; /* pointer to start of chain */
u_int32_t length; /* how many cluster this file contains*/
RB_ENTRY(cluster_chain_descriptor) rb;
u_int32_t flag;
};
#define CLUST_FREE 0 /* 0 means cluster is free */
#define CLUST_FIRST 2 /* 2 is the minimum valid cluster number */
#define CLUST_RSRVD 0xfffffff6 /* start of reserved clusters */
#define CLUST_BAD 0xfffffff7 /* a cluster with a defect */
#define CLUST_EOFS 0xfffffff8 /* start of EOF indicators */
#define CLUST_EOF 0xffffffff /* standard value for last cluster */
/*
* Masks for cluster values
*/
#define CLUST12_MASK 0xfff
#define CLUST16_MASK 0xffff
#define CLUST32_MASK 0xfffffff
#define FAT_USED 1 /* This fat chain is used in a file */
#define DOSLONGNAMELEN 256 /* long name maximal length */
#define LRFIRST 0x40 /* first long name record */
#define LRNOMASK 0x1f /* mask to extract long record
* sequence number */
/*
* Architecture independent description of a directory entry
*/
struct dosDirEntry {
struct dosDirEntry
*parent, /* previous tree level */
*next, /* next brother */
*child; /* if this is a directory */
char name[8+1+3+1]; /* alias name first part */
char lname[DOSLONGNAMELEN]; /* real name */
u_int32_t flags; /* attributes */
cl_t head; /* cluster no */
u_int32_t size; /* filesize in bytes */
u_int32_t fsckflags; /* flags during fsck */
};
/* Flags in fsckflags: */
#define DIREMPTY 1
#define DIREMPWARN 2
/*
* TODO-list of unread directories
*/
struct dirTodoNode {
struct dosDirEntry *dir;
struct dirTodoNode *next;
};
#endif