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check.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 2000 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.1 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
 * Copyright (c) 1995 Martin Husemann
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by Martin Husemann
 *    and Wolfgang Solfrank.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#include <sys/cdefs.h>

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

#include "ext.h"
#include "fsutil.h"

int
checkfilesys(fname)
      const char *fname;
{
      int dosfs;
      struct bootblock boot;
      struct fatEntry *fat = NULL;
      int finish_dosdirsection=0;
      int mod = 0;
      int ret = 8;
      int tryFatalAgain = 1;
      int tryErrorAgain = 3;
      int tryOthersAgain = 3;

      rdonly = alwaysno || quick;
      if (!preen)
            printf("** %s", fname);

      dosfs = open(fname, rdonly ? O_RDONLY : O_RDWR, 0);
      if (dosfs < 0 && !rdonly) {
            dosfs = open(fname, O_RDONLY, 0);
            if (dosfs >= 0)
                  pwarn(" (NO WRITE)\n");
            else if (!preen)
                  printf("\n");
            rdonly = 1;
      } else if (!preen)
            printf("\n");

      if (dosfs < 0) {
            perr("Can't open");
            return 8;
      }

      mod = readboot(dosfs, &boot);
      if (mod & FSFATAL) {
            close(dosfs);
            return 8;
      }
      
      if (quick) {
            /*
             * FAT12 volumes don't have a dirty bit.  If we were asked for
             * a quick check, then actually do a full scan without repairs.
             */
            if (boot.ClustMask == CLUST12_MASK) {
                  /* Don't attempt to do any repairs */
                  rdonly = 1;
                  alwaysno = 1;
                  alwaysyes = 0;
                  quiet = 1;
                  
                  /* Go verify the volume */
                  goto Again;
            }
            else if (isdirty(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0)) {
                  pwarn("FILESYSTEM DIRTY; SKIPPING CHECKS\n");
                  ret = FSDIRTY;
            }
            else {
                  pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
                  ret = 0;
            }
            
            close(dosfs);
            return ret;
      }

Again:
      mod = 0;          /* make sure its reset */
        boot.NumFiles = 0;    /* Reset file count in case we loop back here */
      
      /*
       * [2771127] When there was no active FAT, this code used to
       * compare FAT #0 with all the other FATs.  That doubled the
       * already large memory usage, and doesn't seem very useful.
       * Microsoft's specification says the purpose of the alternate
       * FATs is in case a sector goes bad in the main FAT.  In fact,
       * a Windows 2000 system never even notices the FATs have
       * different values.  Besides, the filesystem itself only ever
       * uses FAT #0.
       */
      if (!preen && !quiet) {
            printf("** Phase 1 - Read FAT\n");
        }
        
      mod |= readfat(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0, &fat);
      if (mod & FSFATAL) {
            close(dosfs);
            return 8;
      }

      if (!preen && !quiet)
            printf("** Phase 2 - Check Cluster Chains\n");

      mod |= checkfat(&boot, fat);
      if (mod & FSFATAL)
            goto out;
      /* delay writing FATs */

      if (!preen && !quiet)
            printf("** Phase 3 - Checking Directories\n");

      mod |= resetDosDirSection(&boot, fat);
      finish_dosdirsection = 1;
      if (mod & FSFATAL)
            goto out;
      /* delay writing FATs */

      mod |= handleDirTree(dosfs, &boot, fat);
      if (mod & FSFATAL)
            goto out;

      if (!preen && !quiet)
            printf("** Phase 4 - Checking for Lost Files\n");

      mod |= checklost(dosfs, &boot, fat);
      if (mod & FSFATAL)
            goto out;

      /* now write the FATs */
      if (mod & FSFATMOD) {
            if (ask(1, "Update FATs")) {
                  mod |= writefat(dosfs, &boot, fat, mod & FSFIXFAT);
                  if (mod & FSFATAL)
                        goto out;
            } else
                  mod |= FSERROR;
      }

      if (quick) {
            if (mod) {
                  printf("FILESYSTEM DIRTY\n");
                  ret = FSDIRTY;
            }
            else {
                  printf("FILESYSTEM CLEAN\n");
                  ret = 0;
            }
      }

      if (boot.NumBad)
            pwarn("%d files, %d free (%d clusters), %d bad (%d clusters)\n",
                    boot.NumFiles,
                    boot.NumFree * boot.ClusterSize / 1024, boot.NumFree,
                    boot.NumBad * boot.ClusterSize / 1024, boot.NumBad);
      else
            pwarn("%d files, %d free (%d clusters)\n",
                    boot.NumFiles,
                    boot.NumFree * boot.ClusterSize / 1024, boot.NumFree);

      if (mod && (mod & FSERROR) == 0) {
            if (mod & FSDIRTY) {
                  if (ask(1, "MARK FILE SYSTEM CLEAN") == 0)
                        mod &= ~FSDIRTY;

                  if (mod & FSDIRTY) {
                        pwarn("MARKING FILE SYSTEM CLEAN\n");
                        mod |= writefat(dosfs, &boot, fat, 1);
                  } else {
                        pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
                        mod |= FSERROR; /* file system not clean */
                  }
            }
      }

      /* Don't bother trying multiple times if we're not doing repairs */
      if (mod && rdonly)
            goto out;

      if ((mod & FSFATAL) && (--tryFatalAgain > 0))
            goto Again;
      if ((mod & FSERROR) && (--tryErrorAgain > 0))
            goto Again;
      if ((mod & FSFIXFAT) && (--tryOthersAgain > 0))
            goto Again;
            
      if (mod & (FSFATAL | FSERROR))
            goto out;

      ret = 0;

    out:
      if (finish_dosdirsection)
            finishDosDirSection();
      free(fat);
      close(dosfs);

      if (mod & (FSFATMOD|FSDIRMOD))
            pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");

      return ret;
}

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