sbin/fsck_msdosfs/check.c

   1 /*
   2  * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
   3  * Copyright (c) 1995 Martin Husemann
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26
  27 #include <sys/cdefs.h>
  28 #ifndef lint
  29 __RCSID("$NetBSD: check.c,v 1.14 2006/06/05 16:51:18 christos Exp $");
  30 static const char rcsid[] =
  31   "$FreeBSD$";
  32 #endif /* not lint */
  33
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <stdio.h>
  37 #include <unistd.h>
  38 #include <fcntl.h>
  39
  40 #include "ext.h"
  41 #include "fsutil.h"
  42
  43 int
  44 checkfilesys(const char *fname)
  45 {
  46         int dosfs;
  47         struct bootblock boot;
  48         struct fatEntry *fat = NULL;
  49         int finish_dosdirsection=0;
  50         u_int i;
  51         int mod = 0;
  52         int ret = 8;
  53
  54         rdonly = alwaysno;
  55         if (!preen)
  56                 printf("** %s", fname);
  57
  58         dosfs = open(fname, rdonly ? O_RDONLY : O_RDWR, 0);
  59         if (dosfs < 0 && !rdonly) {
  60                 dosfs = open(fname, O_RDONLY, 0);
  61                 if (dosfs >= 0)
  62                         pwarn(" (NO WRITE)\n");
  63                 else if (!preen)
  64                         printf("\n");
  65                 rdonly = 1;
  66         } else if (!preen)
  67                 printf("\n");
  68
  69         if (dosfs < 0) {
  70                 perr("Can't open `%s'", fname);
  71                 printf("\n");
  72                 return 8;
  73         }
  74
  75         if (readboot(dosfs, &boot) != FSOK) {
  76                 close(dosfs);
  77                 printf("\n");
  78                 return 8;
  79         }
  80
  81         if (skipclean && preen && checkdirty(dosfs, &boot)) {
  82                 printf("%s: ", fname);
  83                 printf("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
  84                 ret = 0;
  85                 goto out;
  86         }
  87
  88         if (!preen)  {
  89                 if (boot.ValidFat < 0)
  90                         printf("** Phase 1 - Read and Compare FATs\n");
  91                 else
  92                         printf("** Phase 1 - Read FAT\n");
  93         }
  94
  95         mod |= readfat(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0, &fat);
  96         if (mod & FSFATAL) {
  97                 close(dosfs);
  98                 return 8;
  99         }
 100
 101         if (boot.ValidFat < 0)
 102                 for (i = 1; i < boot.bpbFATs; i++) {
 103                         struct fatEntry *currentFat;
 104
 105                         mod |= readfat(dosfs, &boot, i, &currentFat);
 106
 107                         if (mod & FSFATAL)
 108                                 goto out;
 109
 110                         mod |= comparefat(&boot, fat, currentFat, i);
 111                         free(currentFat);
 112                         if (mod & FSFATAL)
 113                                 goto out;
 114                 }
 115
 116         if (!preen)
 117                 printf("** Phase 2 - Check Cluster Chains\n");
 118
 119         mod |= checkfat(&boot, fat);
 120         if (mod & FSFATAL)
 121                 goto out;
 122         /* delay writing FATs */
 123
 124         if (!preen)
 125                 printf("** Phase 3 - Checking Directories\n");
 126
 127         mod |= resetDosDirSection(&boot, fat);
 128         finish_dosdirsection = 1;
 129         if (mod & FSFATAL)
 130                 goto out;
 131         /* delay writing FATs */
 132
 133         mod |= handleDirTree(dosfs, &boot, fat);
 134         if (mod & FSFATAL)
 135                 goto out;
 136
 137         if (!preen)
 138                 printf("** Phase 4 - Checking for Lost Files\n");
 139
 140         mod |= checklost(dosfs, &boot, fat);
 141         if (mod & FSFATAL)
 142                 goto out;
 143
 144         /* now write the FATs */
 145         if (mod & (FSFATMOD|FSFIXFAT)) {
 146                 if (ask(1, "Update FATs")) {
 147                         mod |= writefat(dosfs, &boot, fat, mod & FSFIXFAT);
 148                         if (mod & FSFATAL)
 149                                 goto out;
 150                 } else
 151                         mod |= FSERROR;
 152         }
 153
 154         if (boot.NumBad)
 155                 pwarn("%d files, %d free (%d clusters), %d bad (%d clusters)\n",
 156                       boot.NumFiles,
 157                       boot.NumFree * boot.ClusterSize / 1024, boot.NumFree,
 158                       boot.NumBad * boot.ClusterSize / 1024, boot.NumBad);
 159         else
 160                 pwarn("%d files, %d free (%d clusters)\n",
 161                       boot.NumFiles,
 162                       boot.NumFree * boot.ClusterSize / 1024, boot.NumFree);
 163
 164         if (mod && (mod & FSERROR) == 0) {
 165                 if (mod & FSDIRTY) {
 166                         if (ask(1, "MARK FILE SYSTEM CLEAN") == 0)
 167                                 mod &= ~FSDIRTY;
 168
 169                         if (mod & FSDIRTY) {
 170                                 pwarn("MARKING FILE SYSTEM CLEAN\n");
 171                                 mod |= writefat(dosfs, &boot, fat, 1);
 172                         } else {
 173                                 pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
 174                                 mod |= FSERROR; /* file system not clean */
 175                         }
 176                 }
 177         }
 178
 179         if (mod & (FSFATAL | FSERROR))
 180                 goto out;
 181
 182         ret = 0;
 183
 184     out:
 185         if (finish_dosdirsection)
 186                 finishDosDirSection();
 187         free(fat);
 188         close(dosfs);
 189
 190         if (mod & (FSFATMOD|FSDIRMOD))
 191                 pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
 192
 193         return ret;
 194 }