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      1 /*	$NetBSD: ext.h,v 1.14 2023/09/24 20:41:52 gutteridge 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  *
     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  */
     27 
     28 #ifndef EXT_H
     29 #define EXT_H
     30 
     31 #include <sys/types.h>
     32 
     33 #include "dosfs.h"
     34 
     35 #define	LOSTDIR	"LOST.DIR"
     36 
     37 /*
     38  * Options:
     39  */
     40 extern int alwaysno;	/* assume "no" for all questions */
     41 extern int alwaysyes;	/* assume "yes" for all questions */
     42 extern int preen;	/* we are preening */
     43 extern int rdonly;	/* device is opened read only (supersedes above) */
     44 
     45 extern char *fname;	/* filesystem currently checked */
     46 
     47 extern struct dosDirEntry *rootDir;
     48 
     49 /*
     50  * function declarations
     51  */
     52 int ask(int, const char *, ...) __attribute__((__format__(__printf__,2,3)));
     53 
     54 /*
     55  * Check filesystem given as arg
     56  */
     57 int checkfilesys(const char *);
     58 
     59 /*
     60  * Return values of various functions
     61  */
     62 #define	FSOK		0		/* Check was OK */
     63 #define	FSBOOTMOD	1		/* Boot block was modified */
     64 #define	FSDIRMOD	2		/* Some directory was modified */
     65 #define	FSFATMOD	4		/* The FAT was modified */
     66 #define	FSERROR		8		/* Some unrecovered error remains */
     67 #define	FSFATAL		16		/* Some unrecoverable error occurred */
     68 #define FSDIRTY		32		/* File system is dirty */
     69 #define FSFIXFAT	64		/* Fix file system FAT */
     70 
     71 /*
     72  * Read a boot block in a machine independent fashion and translate
     73  * it into our struct bootblock.
     74  */
     75 int readboot(int, struct bootblock *);
     76 
     77 /*
     78  * Correct the FSInfo block.
     79  */
     80 int writefsinfo(int, struct bootblock *);
     81 
     82 /*
     83  * Read one of the FAT copies and return a pointer to the new
     84  * allocated array holding our description of it.
     85  */
     86 int readfat(int, struct bootblock *, u_int, struct fatEntry **);
     87 
     88 /*
     89  * Check two FAT copies for consistency and merge changes into the
     90  * first if necessary.
     91  */
     92 int comparefat(struct bootblock *, struct fatEntry *, struct fatEntry *, u_int);
     93 
     94 /*
     95  * Check a FAT
     96  */
     97 int checkfat(struct bootblock *, struct fatEntry *);
     98 
     99 /*
    100  * Write back FAT entries
    101  */
    102 int writefat(int, struct bootblock *, struct fatEntry *, int);
    103 
    104 /*
    105  * Read a directory
    106  */
    107 int resetDosDirSection(struct bootblock *, struct fatEntry *);
    108 void finishDosDirSection(void);
    109 int handleDirTree(int, struct bootblock *, struct fatEntry *);
    110 
    111 /*
    112  * Cross-check routines run after everything is completely in memory
    113  */
    114 /*
    115  * Check for lost cluster chains
    116  */
    117 int checklost(int, struct bootblock *, struct fatEntry *);
    118 /*
    119  * Try to reconnect a lost cluster chain
    120  */
    121 int reconnect(int, struct bootblock *, struct fatEntry *, cl_t);
    122 void finishlf(void);
    123 
    124 /*
    125  * Small helper functions
    126  */
    127 /*
    128  * Return the type of a reserved cluster as text
    129  */
    130 const char *rsrvdcltype(cl_t);
    131 
    132 /*
    133  * Clear a cluster chain in a FAT
    134  */
    135 void clearchain(struct bootblock *, struct fatEntry *, cl_t);
    136 
    137 #endif
    138