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/*
* 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>
#ifndef lint
__RCSID("$NetBSD: check.c,v 1.10 2000/04/25 23:02:51 jdolecek Exp $");
static const char rcsid[] =
"$FreeBSD: src/sbin/fsck_msdosfs/check.c,v 1.10 2004/02/05 15:47:46 bde Exp $";
#endif /* not lint */
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include "ext.h"
#include "fsutil.h"
#include "fatcache.h"
#include "fragment.h"
/*
* If the FAT > this size then skip comparing, lest we risk
* OOMing the framework. in the future we need to just re-write
* this whole thing and optimize for less memory
*/
#define FAT_COMPARE_MAX_KB 4096
int
checkfilesys(const char *fname)
{
int dosfs;
struct bootblock boot;
u_char *fat ,*fat2;
int i, finish_dosdirsection=0;
int mod = 0;
int ret = 8;
int quiet = 0;
int skip_fat_compare = 0;
rdonly = alwaysno;
if (!quiet)
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 (!quiet)
printf("\n");
rdonly = 1;
} else if (!quiet)
printf("\n");
if (dosfs < 0) {
perror("Can't open");
return 8;
}
if (readboot(dosfs, &boot) == FSFATAL) {
close(dosfs);
return 8;
}
switch(boot.ClustMask){
case CLUST32_MASK:
fsck_info("FAT32 Filesystem\n");
break;
case CLUST16_MASK:
fsck_info("FAT16 Fielsystem\n");
break;
default:
fsck_info("FAT12 Filesystem\n");
break;
}
fsck_debug("Using cluster_chain_descriptor\n");
fsck_info("Total clusters %u \n",boot.NumClusters);
if (skipclean && preen && checkdirty(dosfs, &boot)) {
printf("%s: ", fname);
printf("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
ret = 0;
goto out;
}
if (((boot.FATsecs * boot.BytesPerSec) / 1024) > FAT_COMPARE_MAX_KB)
skip_fat_compare = 1;
if (!quiet) {
if (skip_fat_compare)
printf("** Phase 1 - Read FAT (compare skipped)\n");
else if (boot.ValidFat < 0)
printf("** Phase 1 - Read and Compare FATs\n");
else
printf("** Phase 1 - Read FAT\n");
}
ret = !_readfat(dosfs, &boot,boot.ValidFat >= 0 ? boot.ValidFat : 0,&fat);
if (ret) {
fsck_debug("Fatal error during _readfat() for comparison\n");
goto out;
}
if (!skip_fat_compare && boot.ValidFat < 0)
for (i = 1; i < (int)boot.FATs; i++) {
//just check the FAT
ret = !_readfat(dosfs, &boot,i,&fat2);
if (ret) {
printf("Fatal error during _readfat() for comparison\n");
goto out;
}
/*have modified comparefat() and subfunction clustdiffer*/
mod |= comparefat(&boot, fat, fat2, i);
free(fat2);
if (mod & FSFATAL) {
printf("Fatal error during FAT comparison\n");
goto out;
}
}
fsck_info("** Phase 2 - Check Cluster Chains \n");
mod |= checkfat(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0, fat);
if (mod & FSFATAL) {
fsck_info("Fatal error during checkfat()\n");
close(dosfs);
return 8;
}
/* delay writing FATs */
if (!quiet)
printf("** Phase 3 - Checking Directories\n");
mod |= resetDosDirSection(&boot);
finish_dosdirsection = 1;
if (mod & FSFATAL) {
printf("Fatal error during resetDosDirSection()\n");
goto out;
}
/* delay writing FATs */
mod |= handleDirTree(dosfs, &boot);
if (mod & FSFATAL)
goto out;
if (!quiet)
printf("** Phase 4 - Checking for Lost Files\n");
mod |= checklost(dosfs, &boot);
if (mod & FSFATAL)
goto out;
/* now write the FATs */
if (mod & FSFATMOD) {
if (ask(1, "Update FATs")) {
mod |= writefat(dosfs, &boot, mod & FSFIXFAT);
if (mod & FSFATAL) {
printf("Fatal error during writefat()\n");
goto out;
}
} else
mod |= FSERROR;
}
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, 1);
} else {
pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
mod |= FSERROR; /* file system not clean */
}
}
}
if (mod & (FSFATAL | FSERROR))
goto out;
ret = 0;
out:
free_rb_tree();
free_fragment_tree(&rb_free_root);
free_fragment_tree(&rb_bad_root);
if (finish_dosdirsection)
finishDosDirSection();
close(dosfs);
if (mod & (FSFATMOD|FSDIRMOD)) {
pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
return 4;
}
return ret;
}
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