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check.c revision 1.6 
      1 /*	$NetBSD: check.c,v 1.6 1997/01/03 14:32:48 ws Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 1995, 1996 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 
     36 #ifndef lint
     37 static char rcsid[] = "$NetBSD: check.c,v 1.6 1997/01/03 14:32:48 ws Exp $";
     38 #endif /* not lint */
     39 
     40 #include <stdlib.h>
     41 #include <string.h>
     42 #include <ctype.h>
     43 #include <stdio.h>
     44 #include <unistd.h>
     45 #include <fcntl.h>
     46 
     47 #include "ext.h"
     48 #include "fsutil.h"
     49 
     50 int
     51 checkfilesys(fname)
     52 	const char *fname;
     53 {
     54 	int dosfs;
     55 	struct bootblock boot;
     56 	struct fatEntry * fat = NULL;
     57 	int i;
     58 	int mod = 0;
     59 
     60 	rdonly = alwaysno;
     61 	if (!preen)
     62 		printf("** %s", fname);
     63 
     64 	dosfs = open(fname, rdonly ? O_RDONLY : O_RDWR, 0);
     65 	if (dosfs < 0 && !rdonly) {
     66 		dosfs = open(fname, O_RDONLY, 0);
     67 		if (dosfs >= 0)
     68 			pwarn(" (NO WRITE)\n");
     69 		else if (!preen)
     70 			printf("\n");
     71 		rdonly = 1;
     72 	} else if (!preen)
     73 		printf("\n");
     74 
     75 	if (dosfs < 0) {
     76 		perror("Can't open");
     77 		return 8;
     78 	}
     79 
     80 	if (readboot(dosfs, &boot) != FSOK) {
     81 		close(dosfs);
     82 		return 8;
     83 	}
     84 
     85 	if (!preen)
     86 		printf("** Phase 1 - Read and Compare FATs\n");
     87 
     88 	for (i = 0; i < boot.FATs; i++) {
     89 		struct fatEntry *currentFat;
     90 
     91 		mod |= readfat(dosfs, &boot, i, &currentFat);
     92 
     93 		if (mod & FSFATAL) {
     94 			if (fat)
     95 				free(fat);
     96 			close(dosfs);
     97 			return 8;
     98 		}
     99 
    100 		if (fat == NULL)
    101 			fat  = currentFat;
    102 		else {
    103 			mod |= comparefat(&boot, fat, currentFat, i + 1);
    104 			free(currentFat);
    105 			if (mod & FSFATAL) {
    106 				free(fat);
    107 				close(dosfs);
    108 				return 8;
    109 			}
    110 		}
    111 	}
    112 
    113 	if (!preen)
    114 		printf("** Phase 2 - Check Cluster Chains\n");
    115 
    116 	mod |= checkfat(&boot, fat);
    117 	if (mod & FSFATAL) {
    118 		free(fat);
    119 		close(dosfs);
    120 		return 8;
    121 	}
    122 
    123 	if (mod & FSFATMOD)
    124 		mod |= writefat(dosfs, &boot, fat); /* delay writing fats?	XXX */
    125 	if (mod & FSFATAL) {
    126 		free(fat);
    127 		close(dosfs);
    128 		return 8;
    129 	}
    130 
    131 	if (!preen)
    132 		printf("** Phase 3 - Checking Directories\n");
    133 
    134 	if (resetDosDirSection(&boot) & FSFATAL) {
    135 		free(fat);
    136 		close(dosfs);
    137 		return 8;
    138 	}
    139 
    140 	mod |= handleDirTree(dosfs, &boot, fat);
    141 	if (mod & FSFATAL) {
    142 		finishDosDirSection();
    143 		free(fat);
    144 		close(dosfs);
    145 		return 8;
    146 	}
    147 
    148 	if (!preen)
    149 		printf("** Phase 4 - Checking for Lost Files\n");
    150 
    151 	mod |= checklost(dosfs, &boot, fat);
    152 
    153 	finishDosDirSection();
    154 	free(fat);
    155 	close(dosfs);
    156 
    157 	if (boot.NumBad)
    158 		pwarn("%d files, %d free (%d clusters), %d bad (%d clusters)\n",
    159 		      boot.NumFiles,
    160 		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree,
    161 		      boot.NumBad * boot.ClusterSize / 1024, boot.NumBad);
    162 	else
    163 		pwarn("%d files, %d free (%d clusters)\n",
    164 		      boot.NumFiles,
    165 		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree);
    166 	if (mod & (FSFATAL | FSERROR))
    167 		return 8;
    168 	if (mod) {
    169 		pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
    170 		return 4;
    171 	}
    172 	return 0;
    173 }
    174