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ext.h revision 1.5 
      1 /*	$NetBSD: ext.h,v 1.5 1997/10/17 11:19:48 ws Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
      5  * Copyright (c) 1995 Martin Husemann
      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  * 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.
     22  *
     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  */
     34 
     35 #ifndef EXT_H
     36 #define EXT_H
     37 
     38 #include <sys/types.h>
     39 
     40 #include "dosfs.h"
     41 
     42 #define	LOSTDIR	"LOST.DIR"
     43 
     44 /*
     45  * Options:
     46  */
     47 extern int alwaysno;	/* assume "no" for all questions */
     48 extern int alwaysyes;	/* assume "yes" for all questions */
     49 extern int preen;	/* we are preening */
     50 extern int rdonly;	/* device is opened read only (supersedes above) */
     51 
     52 extern char *fname;	/* filesystem currently checked */
     53 
     54 extern struct dosDirEntry *rootDir;
     55 
     56 /*
     57  * function declarations
     58  */
     59 int ask __P((int, const char *, ...));
     60 
     61 /*
     62  * Check filesystem given as arg
     63  */
     64 int checkfilesys __P((const char *));
     65 
     66 /*
     67  * Return values of various functions
     68  */
     69 #define	FSOK		0		/* Check was OK */
     70 #define	FSBOOTMOD	1		/* Boot block was modified */
     71 #define	FSDIRMOD	2		/* Some directory was modified */
     72 #define	FSFATMOD	4		/* The FAT was modified */
     73 #define	FSERROR		8		/* Some unrecovered error remains */
     74 #define	FSFATAL		16		/* Some unrecoverable error occured */
     75 
     76 /*
     77  * read a boot block in a machine independend fashion and translate
     78  * it into our struct bootblock.
     79  */
     80 int readboot __P((int, struct bootblock *));
     81 
     82 /*
     83  * Correct the FSInfo block.
     84  */
     85 int writefsinfo __P((int, struct bootblock *));
     86 
     87 /*
     88  * Read one of the FAT copies and return a pointer to the new
     89  * allocated array holding our description of it.
     90  */
     91 int readfat __P((int, struct bootblock *, int, struct fatEntry **));
     92 
     93 /*
     94  * Check two FAT copies for consistency and merge changes into the
     95  * first if neccessary.
     96  */
     97 int comparefat __P((struct bootblock *, struct fatEntry *, struct fatEntry *, int));
     98 
     99 /*
    100  * Check a FAT
    101  */
    102 int checkfat __P((struct bootblock *, struct fatEntry *));
    103 
    104 /*
    105  * Write back FAT entries
    106  */
    107 int writefat __P((int, struct bootblock *, struct fatEntry *));
    108 
    109 /*
    110  * Read a directory
    111  */
    112 int resetDosDirSection __P((struct bootblock *, struct fatEntry *));
    113 void finishDosDirSection __P((void));
    114 int handleDirTree __P((int, struct bootblock *, struct fatEntry *));
    115 
    116 /*
    117  * Cross-check routines run after everything is completely in memory
    118  */
    119 /*
    120  * Check for lost cluster chains
    121  */
    122 int checklost __P((int, struct bootblock *, struct fatEntry *));
    123 /*
    124  * Try to reconnect a lost cluster chain
    125  */
    126 int reconnect __P((int, struct bootblock *, struct fatEntry *, cl_t));
    127 void finishlf __P((void));
    128 
    129 /*
    130  * Small helper functions
    131  */
    132 /*
    133  * Return the type of a reserved cluster as text
    134  */
    135 char *rsrvdcltype __P((cl_t));
    136 
    137 /*
    138  * Clear a cluster chain in a FAT
    139  */
    140 void clearchain __P((struct bootblock *, struct fatEntry *, cl_t));
    141 
    142 #endif
    143