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  * $DragonFly: src/sbin/fsck_msdosfs/check.c,v 1.3 2003/09/28 16:39:17 hmp Exp $
  35  */
  36
  37
  38 #include <sys/cdefs.h>
  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(const char *fname)
  52 {
  53         int dosfs;
  54         struct bootblock boot;
  55         struct fatEntry *fat = NULL;
  56         int i, finish_dosdirsection=0;
  57         int mod = 0;
  58         int ret = 8;
  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                 printf("\n");
  83                 return 8;
  84         }
  85
  86         if (!preen)  {
  87                 if (boot.ValidFat < 0)
  88                         printf("** Phase 1 - Read and Compare FATs\n");
  89                 else
  90                         printf("** Phase 1 - Read FAT\n");
  91         }
  92
  93         mod |= readfat(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0, &fat);
  94         if (mod & FSFATAL) {
  95                 close(dosfs);
  96                 return 8;
  97         }
  98
  99         if (boot.ValidFat < 0)
 100                 for (i = 1; i < boot.FATs; i++) {
 101                         struct fatEntry *currentFat;
 102
 103                         mod |= readfat(dosfs, &boot, i, &currentFat);
 104
 105                         if (mod & FSFATAL)
 106                                 goto out;
 107
 108                         mod |= comparefat(&boot, fat, currentFat, i);
 109                         free(currentFat);
 110                         if (mod & FSFATAL)
 111                                 goto out;
 112                 }
 113
 114         if (!preen)
 115                 printf("** Phase 2 - Check Cluster Chains\n");
 116
 117         mod |= checkfat(&boot, fat);
 118         if (mod & FSFATAL)
 119                 goto out;
 120         /* delay writing FATs */
 121
 122         if (!preen)
 123                 printf("** Phase 3 - Checking Directories\n");
 124
 125         mod |= resetDosDirSection(&boot, fat);
 126         finish_dosdirsection = 1;
 127         if (mod & FSFATAL)
 128                 goto out;
 129         /* delay writing FATs */
 130
 131         mod |= handleDirTree(dosfs, &boot, fat);
 132         if (mod & FSFATAL)
 133                 goto out;
 134
 135         if (!preen)
 136                 printf("** Phase 4 - Checking for Lost Files\n");
 137
 138         mod |= checklost(dosfs, &boot, fat);
 139         if (mod & FSFATAL)
 140                 goto out;
 141
 142         /* now write the FATs */
 143         if (mod & FSFATMOD) {
 144                 if (ask(1, "Update FATs")) {
 145                         mod |= writefat(dosfs, &boot, fat, mod & FSFIXFAT);
 146                         if (mod & FSFATAL)
 147                                 goto out;
 148                 } else
 149                         mod |= FSERROR;
 150         }
 151
 152         if (boot.NumBad)
 153                 pwarn("%d files, %d free (%d clusters), %d bad (%d clusters)\n",
 154                       boot.NumFiles,
 155                       boot.NumFree * boot.ClusterSize / 1024, boot.NumFree,
 156                       boot.NumBad * boot.ClusterSize / 1024, boot.NumBad);
 157         else
 158                 pwarn("%d files, %d free (%d clusters)\n",
 159                       boot.NumFiles,
 160                       boot.NumFree * boot.ClusterSize / 1024, boot.NumFree);
 161
 162         if (mod && (mod & FSERROR) == 0) {
 163                 if (mod & FSDIRTY) {
 164                         if (ask(1, "MARK FILE SYSTEM CLEAN") == 0)
 165                                 mod &= ~FSDIRTY;
 166
 167                         if (mod & FSDIRTY) {
 168                                 pwarn("MARKING FILE SYSTEM CLEAN\n");
 169                                 mod |= writefat(dosfs, &boot, fat, 1);
 170                         } else {
 171                                 pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
 172                                 mod |= FSERROR; /* file system not clean */
 173                         }
 174                 }
 175         }
 176
 177         if (mod & (FSFATAL | FSERROR))
 178                 goto out;
 179
 180         ret = 0;
 181
 182     out:
 183         if (finish_dosdirsection)
 184                 finishDosDirSection();
 185         free(fat);
 186         close(dosfs);
 187
 188         if (mod & (FSFATMOD|FSDIRMOD))
 189                 pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
 190
 191         return ret;
 192 }