sbin/fsck_msdos/check.c

   1 /*      $NetBSD: check.c,v 1.17 2008/06/13 20:46:09 martin 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
  29 #include <sys/cdefs.h>
  30 #ifndef lint
  31 __RCSID("$NetBSD: check.c,v 1.17 2008/06/13 20:46:09 martin Exp $");
  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 #include "exitvalues.h"
  43
  44 int
  45 checkfilesys(const char *filename)
  46 {
  47         int dosfs;
  48         struct bootblock boot;
  49         struct fatEntry *fat = NULL;
  50         int finish_dosdirsection=0;
  51         u_int i;
  52         int mod = 0;
  53         int ret = FSCK_EXIT_CHECK_FAILED;
  54
  55         rdonly = alwaysno;
  56         if (!preen)
  57                 printf("** %s", filename);
  58
  59         dosfs = open(filename, rdonly ? O_RDONLY : O_RDWR, 0);
  60         if (dosfs < 0 && !rdonly) {
  61                 dosfs = open(filename, O_RDONLY, 0);
  62                 if (dosfs >= 0)
  63                         pwarn(" (NO WRITE)\n");
  64                 else if (!preen)
  65                         printf("\n");
  66                 rdonly = 1;
  67         } else if (!preen)
  68                 printf("\n");
  69
  70         if (dosfs < 0) {
  71                 perr("Can't open `%s'", filename);
  72                 return FSCK_EXIT_CHECK_FAILED;
  73         }
  74
  75         if (readboot(dosfs, &boot) != FSOK) {
  76                 close(dosfs);
  77                 printf("\n");
  78                 return FSCK_EXIT_CHECK_FAILED;
  79         }
  80
  81         if (!preen)  {
  82                 if (boot.ValidFat < 0)
  83                         printf("** Phase 1 - Read and Compare FATs\n");
  84                 else
  85                         printf("** Phase 1 - Read FAT\n");
  86         }
  87
  88         mod |= readfat(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0, &fat);
  89         if (mod & FSFATAL) {
  90                 close(dosfs);
  91                 return FSCK_EXIT_CHECK_FAILED;
  92         }
  93
  94         if (boot.ValidFat < 0)
  95                 for (i = 1; i < boot.FATs; i++) {
  96                         struct fatEntry *currentFat;
  97
  98                         mod |= readfat(dosfs, &boot, i, &currentFat);
  99
 100                         if (mod & FSFATAL)
 101                                 goto out;
 102
 103                         mod |= comparefat(&boot, fat, currentFat, i);
 104                         free(currentFat);
 105                         if (mod & FSFATAL)
 106                                 goto out;
 107                 }
 108
 109         if (!preen)
 110                 printf("** Phase 2 - Check Cluster Chains\n");
 111
 112         mod |= checkfat(&boot, fat);
 113         if (mod & FSFATAL)
 114                 goto out;
 115         /* delay writing FATs */
 116
 117         if (!preen)
 118                 printf("** Phase 3 - Checking Directories\n");
 119
 120         mod |= resetDosDirSection(&boot, fat);
 121         finish_dosdirsection = 1;
 122         if (mod & FSFATAL)
 123                 goto out;
 124         /* delay writing FATs */
 125
 126         mod |= handleDirTree(dosfs, &boot, fat);
 127         if (mod & FSFATAL)
 128                 goto out;
 129
 130         if (!preen)
 131                 printf("** Phase 4 - Checking for Lost Files\n");
 132
 133         mod |= checklost(dosfs, &boot, fat);
 134         if (mod & FSFATAL)
 135                 goto out;
 136
 137         /* now write the FATs */
 138         if (mod & FSFATMOD) {
 139                 if (ask(1, "Update FATs")) {
 140                         mod |= writefat(dosfs, &boot, fat, mod & FSFIXFAT);
 141                         if (mod & FSFATAL)
 142                                 goto out;
 143                 } else
 144                         mod |= FSERROR;
 145         }
 146
 147         if (boot.NumBad)
 148                 pwarn("%d files, %d free (%d clusters), %d bad (%d clusters)\n",
 149                       boot.NumFiles,
 150                       boot.NumFree * boot.ClusterSize / 1024, boot.NumFree,
 151                       boot.NumBad * boot.ClusterSize / 1024, boot.NumBad);
 152         else
 153                 pwarn("%d files, %d free (%d clusters)\n",
 154                       boot.NumFiles,
 155                       boot.NumFree * boot.ClusterSize / 1024, boot.NumFree);
 156
 157         if (mod && (mod & FSERROR) == 0) {
 158                 if (mod & FSDIRTY) {
 159                         if (ask(1, "MARK FILE SYSTEM CLEAN") == 0)
 160                                 mod &= ~FSDIRTY;
 161
 162                         if (mod & FSDIRTY) {
 163                                 pwarn("MARKING FILE SYSTEM CLEAN\n");
 164                                 mod |= writefat(dosfs, &boot, fat, 1);
 165                         } else {
 166                                 pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
 167                                 mod |= FSERROR; /* file system not clean */
 168                         }
 169                 }
 170         }
 171
 172         if (mod & (FSFATAL | FSERROR))
 173                 goto out;
 174
 175         ret = FSCK_EXIT_OK;
 176
 177     out:
 178         if (finish_dosdirsection)
 179                 finishDosDirSection();
 180         free(fat);
 181         close(dosfs);
 182
 183         if (mod & (FSFATMOD|FSDIRMOD))
 184                 pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
 185
 186         return ret;
 187 }