xref: /freebsd/sbin/fsck_msdosfs/check.c (revision 0121b42aca389e437df57a6e6add76a614e8bae2)
10121b42aSDavid E. O'Brien /*
20121b42aSDavid E. O'Brien  * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
30121b42aSDavid E. O'Brien  * Copyright (c) 1995 Martin Husemann
40121b42aSDavid E. O'Brien  *
50121b42aSDavid E. O'Brien  * Redistribution and use in source and binary forms, with or without
60121b42aSDavid E. O'Brien  * modification, are permitted provided that the following conditions
70121b42aSDavid E. O'Brien  * are met:
80121b42aSDavid E. O'Brien  * 1. Redistributions of source code must retain the above copyright
90121b42aSDavid E. O'Brien  *    notice, this list of conditions and the following disclaimer.
100121b42aSDavid E. O'Brien  * 2. Redistributions in binary form must reproduce the above copyright
110121b42aSDavid E. O'Brien  *    notice, this list of conditions and the following disclaimer in the
120121b42aSDavid E. O'Brien  *    documentation and/or other materials provided with the distribution.
130121b42aSDavid E. O'Brien  * 3. All advertising materials mentioning features or use of this software
140121b42aSDavid E. O'Brien  *    must display the following acknowledgement:
150121b42aSDavid E. O'Brien  *	This product includes software developed by Martin Husemann
160121b42aSDavid E. O'Brien  *	and Wolfgang Solfrank.
170121b42aSDavid E. O'Brien  * 4. Neither the name of the University nor the names of its contributors
180121b42aSDavid E. O'Brien  *    may be used to endorse or promote products derived from this software
190121b42aSDavid E. O'Brien  *    without specific prior written permission.
200121b42aSDavid E. O'Brien  *
210121b42aSDavid E. O'Brien  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
220121b42aSDavid E. O'Brien  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
230121b42aSDavid E. O'Brien  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
240121b42aSDavid E. O'Brien  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
250121b42aSDavid E. O'Brien  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
260121b42aSDavid E. O'Brien  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
270121b42aSDavid E. O'Brien  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
280121b42aSDavid E. O'Brien  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
290121b42aSDavid E. O'Brien  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
300121b42aSDavid E. O'Brien  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
310121b42aSDavid E. O'Brien  */
320121b42aSDavid E. O'Brien 
330121b42aSDavid E. O'Brien 
340121b42aSDavid E. O'Brien #include <sys/cdefs.h>
350121b42aSDavid E. O'Brien #ifndef lint
360121b42aSDavid E. O'Brien __RCSID("$NetBSD: check.c,v 1.10 2000/04/25 23:02:51 jdolecek Exp $");
370121b42aSDavid E. O'Brien static const char rcsid[] =
380121b42aSDavid E. O'Brien   "$FreeBSD$";
390121b42aSDavid E. O'Brien #endif /* not lint */
400121b42aSDavid E. O'Brien 
410121b42aSDavid E. O'Brien #include <stdlib.h>
420121b42aSDavid E. O'Brien #include <string.h>
430121b42aSDavid E. O'Brien #include <ctype.h>
440121b42aSDavid E. O'Brien #include <stdio.h>
450121b42aSDavid E. O'Brien #include <unistd.h>
460121b42aSDavid E. O'Brien #include <fcntl.h>
470121b42aSDavid E. O'Brien 
480121b42aSDavid E. O'Brien #include "ext.h"
490121b42aSDavid E. O'Brien #include "fsutil.h"
500121b42aSDavid E. O'Brien 
510121b42aSDavid E. O'Brien int
520121b42aSDavid E. O'Brien checkfilesys(fname)
530121b42aSDavid E. O'Brien 	const char *fname;
540121b42aSDavid E. O'Brien {
550121b42aSDavid E. O'Brien 	int dosfs;
560121b42aSDavid E. O'Brien 	struct bootblock boot;
570121b42aSDavid E. O'Brien 	struct fatEntry *fat = NULL;
580121b42aSDavid E. O'Brien 	int i, finish_dosdirsection=0;
590121b42aSDavid E. O'Brien 	int mod = 0;
600121b42aSDavid E. O'Brien 	int ret = 8;
610121b42aSDavid E. O'Brien 
620121b42aSDavid E. O'Brien 	rdonly = alwaysno;
630121b42aSDavid E. O'Brien 	if (!preen)
640121b42aSDavid E. O'Brien 		printf("** %s", fname);
650121b42aSDavid E. O'Brien 
660121b42aSDavid E. O'Brien 	dosfs = open(fname, rdonly ? O_RDONLY : O_RDWR, 0);
670121b42aSDavid E. O'Brien 	if (dosfs < 0 && !rdonly) {
680121b42aSDavid E. O'Brien 		dosfs = open(fname, O_RDONLY, 0);
690121b42aSDavid E. O'Brien 		if (dosfs >= 0)
700121b42aSDavid E. O'Brien 			pwarn(" (NO WRITE)\n");
710121b42aSDavid E. O'Brien 		else if (!preen)
720121b42aSDavid E. O'Brien 			printf("\n");
730121b42aSDavid E. O'Brien 		rdonly = 1;
740121b42aSDavid E. O'Brien 	} else if (!preen)
750121b42aSDavid E. O'Brien 		printf("\n");
760121b42aSDavid E. O'Brien 
770121b42aSDavid E. O'Brien 	if (dosfs < 0) {
780121b42aSDavid E. O'Brien 		perror("Can't open");
790121b42aSDavid E. O'Brien 		return 8;
800121b42aSDavid E. O'Brien 	}
810121b42aSDavid E. O'Brien 
820121b42aSDavid E. O'Brien 	if (readboot(dosfs, &boot) != FSOK) {
830121b42aSDavid E. O'Brien 		close(dosfs);
840121b42aSDavid E. O'Brien 		printf("\n");
850121b42aSDavid E. O'Brien 		return 8;
860121b42aSDavid E. O'Brien 	}
870121b42aSDavid E. O'Brien 
880121b42aSDavid E. O'Brien 	if (!preen)  {
890121b42aSDavid E. O'Brien 		if (boot.ValidFat < 0)
900121b42aSDavid E. O'Brien 			printf("** Phase 1 - Read and Compare FATs\n");
910121b42aSDavid E. O'Brien 		else
920121b42aSDavid E. O'Brien 			printf("** Phase 1 - Read FAT\n");
930121b42aSDavid E. O'Brien 	}
940121b42aSDavid E. O'Brien 
950121b42aSDavid E. O'Brien 	mod |= readfat(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0, &fat);
960121b42aSDavid E. O'Brien 	if (mod & FSFATAL) {
970121b42aSDavid E. O'Brien 		close(dosfs);
980121b42aSDavid E. O'Brien 		return 8;
990121b42aSDavid E. O'Brien 	}
1000121b42aSDavid E. O'Brien 
1010121b42aSDavid E. O'Brien 	if (boot.ValidFat < 0)
1020121b42aSDavid E. O'Brien 		for (i = 1; i < boot.FATs; i++) {
1030121b42aSDavid E. O'Brien 			struct fatEntry *currentFat;
1040121b42aSDavid E. O'Brien 
1050121b42aSDavid E. O'Brien 			mod |= readfat(dosfs, &boot, i, &currentFat);
1060121b42aSDavid E. O'Brien 
1070121b42aSDavid E. O'Brien 			if (mod & FSFATAL)
1080121b42aSDavid E. O'Brien 				goto out;
1090121b42aSDavid E. O'Brien 
1100121b42aSDavid E. O'Brien 			mod |= comparefat(&boot, fat, currentFat, i);
1110121b42aSDavid E. O'Brien 			free(currentFat);
1120121b42aSDavid E. O'Brien 			if (mod & FSFATAL)
1130121b42aSDavid E. O'Brien 				goto out;
1140121b42aSDavid E. O'Brien 		}
1150121b42aSDavid E. O'Brien 
1160121b42aSDavid E. O'Brien 	if (!preen)
1170121b42aSDavid E. O'Brien 		printf("** Phase 2 - Check Cluster Chains\n");
1180121b42aSDavid E. O'Brien 
1190121b42aSDavid E. O'Brien 	mod |= checkfat(&boot, fat);
1200121b42aSDavid E. O'Brien 	if (mod & FSFATAL)
1210121b42aSDavid E. O'Brien 		goto out;
1220121b42aSDavid E. O'Brien 	/* delay writing FATs */
1230121b42aSDavid E. O'Brien 
1240121b42aSDavid E. O'Brien 	if (!preen)
1250121b42aSDavid E. O'Brien 		printf("** Phase 3 - Checking Directories\n");
1260121b42aSDavid E. O'Brien 
1270121b42aSDavid E. O'Brien 	mod |= resetDosDirSection(&boot, fat);
1280121b42aSDavid E. O'Brien 	finish_dosdirsection = 1;
1290121b42aSDavid E. O'Brien 	if (mod & FSFATAL)
1300121b42aSDavid E. O'Brien 		goto out;
1310121b42aSDavid E. O'Brien 	/* delay writing FATs */
1320121b42aSDavid E. O'Brien 
1330121b42aSDavid E. O'Brien 	mod |= handleDirTree(dosfs, &boot, fat);
1340121b42aSDavid E. O'Brien 	if (mod & FSFATAL)
1350121b42aSDavid E. O'Brien 		goto out;
1360121b42aSDavid E. O'Brien 
1370121b42aSDavid E. O'Brien 	if (!preen)
1380121b42aSDavid E. O'Brien 		printf("** Phase 4 - Checking for Lost Files\n");
1390121b42aSDavid E. O'Brien 
1400121b42aSDavid E. O'Brien 	mod |= checklost(dosfs, &boot, fat);
1410121b42aSDavid E. O'Brien 	if (mod & FSFATAL)
1420121b42aSDavid E. O'Brien 		goto out;
1430121b42aSDavid E. O'Brien 
1440121b42aSDavid E. O'Brien 	/* now write the FATs */
1450121b42aSDavid E. O'Brien 	if (mod & FSFATMOD) {
1460121b42aSDavid E. O'Brien 		if (ask(1, "Update FATs")) {
1470121b42aSDavid E. O'Brien 			mod |= writefat(dosfs, &boot, fat, mod & FSFIXFAT);
1480121b42aSDavid E. O'Brien 			if (mod & FSFATAL)
1490121b42aSDavid E. O'Brien 				goto out;
1500121b42aSDavid E. O'Brien 		} else
1510121b42aSDavid E. O'Brien 			mod |= FSERROR;
1520121b42aSDavid E. O'Brien 	}
1530121b42aSDavid E. O'Brien 
1540121b42aSDavid E. O'Brien 	if (boot.NumBad)
1550121b42aSDavid E. O'Brien 		pwarn("%d files, %d free (%d clusters), %d bad (%d clusters)\n",
1560121b42aSDavid E. O'Brien 		      boot.NumFiles,
1570121b42aSDavid E. O'Brien 		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree,
1580121b42aSDavid E. O'Brien 		      boot.NumBad * boot.ClusterSize / 1024, boot.NumBad);
1590121b42aSDavid E. O'Brien 	else
1600121b42aSDavid E. O'Brien 		pwarn("%d files, %d free (%d clusters)\n",
1610121b42aSDavid E. O'Brien 		      boot.NumFiles,
1620121b42aSDavid E. O'Brien 		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree);
1630121b42aSDavid E. O'Brien 
1640121b42aSDavid E. O'Brien 	if (mod && (mod & FSERROR) == 0) {
1650121b42aSDavid E. O'Brien 		if (mod & FSDIRTY) {
1660121b42aSDavid E. O'Brien 			if (ask(1, "MARK FILE SYSTEM CLEAN") == 0)
1670121b42aSDavid E. O'Brien 				mod &= ~FSDIRTY;
1680121b42aSDavid E. O'Brien 
1690121b42aSDavid E. O'Brien 			if (mod & FSDIRTY) {
1700121b42aSDavid E. O'Brien 				pwarn("MARKING FILE SYSTEM CLEAN\n");
1710121b42aSDavid E. O'Brien 				mod |= writefat(dosfs, &boot, fat, 1);
1720121b42aSDavid E. O'Brien 			} else {
1730121b42aSDavid E. O'Brien 				pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
1740121b42aSDavid E. O'Brien 				mod |= FSERROR; /* file system not clean */
1750121b42aSDavid E. O'Brien 			}
1760121b42aSDavid E. O'Brien 		}
1770121b42aSDavid E. O'Brien 	}
1780121b42aSDavid E. O'Brien 
1790121b42aSDavid E. O'Brien 	if (mod & (FSFATAL | FSERROR))
1800121b42aSDavid E. O'Brien 		goto out;
1810121b42aSDavid E. O'Brien 
1820121b42aSDavid E. O'Brien 	ret = 0;
1830121b42aSDavid E. O'Brien 
1840121b42aSDavid E. O'Brien     out:
1850121b42aSDavid E. O'Brien 	if (finish_dosdirsection)
1860121b42aSDavid E. O'Brien 		finishDosDirSection();
1870121b42aSDavid E. O'Brien 	free(fat);
1880121b42aSDavid E. O'Brien 	close(dosfs);
1890121b42aSDavid E. O'Brien 
1900121b42aSDavid E. O'Brien 	if (mod & (FSFATMOD|FSDIRMOD))
1910121b42aSDavid E. O'Brien 		pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
1920121b42aSDavid E. O'Brien 
1930121b42aSDavid E. O'Brien 	return ret;
1940121b42aSDavid E. O'Brien }
195