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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Martin Husemann
  16  *      and Wolfgang Solfrank.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * $NetBSD: check.c,v 1.10 2000/04/25 23:02:51 jdolecek Exp $
  33  * $FreeBSD: src/sbin/fsck_msdosfs/check.c,v 1.1.2.1 2001/08/01 05:47:55 obrien Exp $
  34  */
  35
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <ctype.h>
  39 #include <stdio.h>
  40 #include <unistd.h>
  41 #include <fcntl.h>
  42
  43 #include "ext.h"
  44 #include "fsutil.h"
  45
  46 int
  47 checkfilesys(const char *fname)
  48 {
  49         int dosfs;
  50         struct bootblock boot;
  51         struct fatEntry *fat = NULL;
  52         int i, finish_dosdirsection=0;
  53         int mod = 0;
  54         int ret = 8;
  55
  56         rdonly = alwaysno;
  57         if (!preen)
  58                 printf("** %s", fname);
  59
  60         dosfs = open(fname, rdonly ? O_RDONLY : O_RDWR, 0);
  61         if (dosfs < 0 && !rdonly) {
  62                 dosfs = open(fname, O_RDONLY, 0);
  63                 if (dosfs >= 0)
  64                         pwarn(" (NO WRITE)\n");
  65                 else if (!preen)
  66                         printf("\n");
  67                 rdonly = 1;
  68         } else if (!preen)
  69                 printf("\n");
  70
  71         if (dosfs < 0) {
  72                 perror("Can't open");
  73                 return 8;
  74         }
  75
  76         if (readboot(dosfs, &boot) != FSOK) {
  77                 close(dosfs);
  78                 printf("\n");
  79                 return 8;
  80         }
  81
  82         if (!preen)  {
  83                 if (boot.ValidFat < 0)
  84                         printf("** Phase 1 - Read and Compare FATs\n");
  85                 else
  86                         printf("** Phase 1 - Read FAT\n");
  87         }
  88
  89         mod |= readfat(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0, &fat);
  90         if (mod & FSFATAL) {
  91                 close(dosfs);
  92                 return 8;
  93         }
  94
  95         if (boot.ValidFat < 0)
  96                 for (i = 1; i < boot.FATs; i++) {
  97                         struct fatEntry *currentFat;
  98
  99                         mod |= readfat(dosfs, &boot, i, &currentFat);
 100
 101                         if (mod & FSFATAL)
 102                                 goto out;
 103
 104                         mod |= comparefat(&boot, fat, currentFat, i);
 105                         free(currentFat);
 106                         if (mod & FSFATAL)
 107                                 goto out;
 108                 }
 109
 110         if (!preen)
 111                 printf("** Phase 2 - Check Cluster Chains\n");
 112
 113         mod |= checkfat(&boot, fat);
 114         if (mod & FSFATAL)
 115                 goto out;
 116         /* delay writing FATs */
 117
 118         if (!preen)
 119                 printf("** Phase 3 - Checking Directories\n");
 120
 121         mod |= resetDosDirSection(&boot, fat);
 122         finish_dosdirsection = 1;
 123         if (mod & FSFATAL)
 124                 goto out;
 125         /* delay writing FATs */
 126
 127         mod |= handleDirTree(dosfs, &boot, fat);
 128         if (mod & FSFATAL)
 129                 goto out;
 130
 131         if (!preen)
 132                 printf("** Phase 4 - Checking for Lost Files\n");
 133
 134         mod |= checklost(dosfs, &boot, fat);
 135         if (mod & FSFATAL)
 136                 goto out;
 137
 138         /* now write the FATs */
 139         if (mod & FSFATMOD) {
 140                 if (ask(1, "Update FATs")) {
 141                         mod |= writefat(dosfs, &boot, fat, mod & FSFIXFAT);
 142                         if (mod & FSFATAL)
 143                                 goto out;
 144                 } else
 145                         mod |= FSERROR;
 146         }
 147
 148         if (boot.NumBad)
 149                 pwarn("%d files, %d free (%d clusters), %d bad (%d clusters)\n",
 150                       boot.NumFiles,
 151                       boot.NumFree * boot.ClusterSize / 1024, boot.NumFree,
 152                       boot.NumBad * boot.ClusterSize / 1024, boot.NumBad);
 153         else
 154                 pwarn("%d files, %d free (%d clusters)\n",
 155                       boot.NumFiles,
 156                       boot.NumFree * boot.ClusterSize / 1024, boot.NumFree);
 157
 158         if (mod && (mod & FSERROR) == 0) {
 159                 if (mod & FSDIRTY) {
 160                         if (ask(1, "MARK FILE SYSTEM CLEAN") == 0)
 161                                 mod &= ~FSDIRTY;
 162
 163                         if (mod & FSDIRTY) {
 164                                 pwarn("MARKING FILE SYSTEM CLEAN\n");
 165                                 mod |= writefat(dosfs, &boot, fat, 1);
 166                         } else {
 167                                 pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
 168                                 mod |= FSERROR; /* file system not clean */
 169                         }
 170                 }
 171         }
 172
 173         if (mod & (FSFATAL | FSERROR))
 174                 goto out;
 175
 176         ret = 0;
 177
 178     out:
 179         if (finish_dosdirsection)
 180                 finishDosDirSection();
 181         free(fat);
 182         close(dosfs);
 183
 184         if (mod & (FSFATMOD|FSDIRMOD))
 185                 pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
 186
 187         return ret;
 188 }