check.c revision 125486 
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
33
34#include <sys/cdefs.h>
35#ifndef lint
36__RCSID("$NetBSD: check.c,v 1.10 2000/04/25 23:02:51 jdolecek Exp $");
37static const char rcsid[] =
38  "$FreeBSD: head/sbin/fsck_msdosfs/check.c 125486 2004-02-05 15:47:46Z bde $";
39#endif /* not lint */
40
41#include <stdlib.h>
42#include <string.h>
43#include <ctype.h>
44#include <stdio.h>
45#include <unistd.h>
46#include <fcntl.h>
47
48#include "ext.h"
49#include "fsutil.h"
50
51int
52checkfilesys(const char *fname)
53{
54	int dosfs;
55	struct bootblock boot;
56	struct fatEntry *fat = NULL;
57	int i, finish_dosdirsection=0;
58	int mod = 0;
59	int ret = 8;
60
61	rdonly = alwaysno;
62	if (!preen)
63		printf("** %s", fname);
64
65	dosfs = open(fname, rdonly ? O_RDONLY : O_RDWR, 0);
66	if (dosfs < 0 && !rdonly) {
67		dosfs = open(fname, O_RDONLY, 0);
68		if (dosfs >= 0)
69			pwarn(" (NO WRITE)\n");
70		else if (!preen)
71			printf("\n");
72		rdonly = 1;
73	} else if (!preen)
74		printf("\n");
75
76	if (dosfs < 0) {
77		perror("Can't open");
78		return 8;
79	}
80
81	if (readboot(dosfs, &boot) != FSOK) {
82		close(dosfs);
83		printf("\n");
84		return 8;
85	}
86
87	if (skipclean && preen && checkdirty(dosfs, &boot)) {
88		printf("%s: ", fname);
89		printf("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
90		ret = 0;
91		goto out;
92	}
93
94	if (!preen)  {
95		if (boot.ValidFat < 0)
96			printf("** Phase 1 - Read and Compare FATs\n");
97		else
98			printf("** Phase 1 - Read FAT\n");
99	}
100
101	mod |= readfat(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0, &fat);
102	if (mod & FSFATAL) {
103		close(dosfs);
104		return 8;
105	}
106
107	if (boot.ValidFat < 0)
108		for (i = 1; i < (int)boot.FATs; i++) {
109			struct fatEntry *currentFat;
110
111			mod |= readfat(dosfs, &boot, i, &currentFat);
112
113			if (mod & FSFATAL)
114				goto out;
115
116			mod |= comparefat(&boot, fat, currentFat, i);
117			free(currentFat);
118			if (mod & FSFATAL)
119				goto out;
120		}
121
122	if (!preen)
123		printf("** Phase 2 - Check Cluster Chains\n");
124
125	mod |= checkfat(&boot, fat);
126	if (mod & FSFATAL)
127		goto out;
128	/* delay writing FATs */
129
130	if (!preen)
131		printf("** Phase 3 - Checking Directories\n");
132
133	mod |= resetDosDirSection(&boot, fat);
134	finish_dosdirsection = 1;
135	if (mod & FSFATAL)
136		goto out;
137	/* delay writing FATs */
138
139	mod |= handleDirTree(dosfs, &boot, fat);
140	if (mod & FSFATAL)
141		goto out;
142
143	if (!preen)
144		printf("** Phase 4 - Checking for Lost Files\n");
145
146	mod |= checklost(dosfs, &boot, fat);
147	if (mod & FSFATAL)
148		goto out;
149
150	/* now write the FATs */
151	if (mod & FSFATMOD) {
152		if (ask(1, "Update FATs")) {
153			mod |= writefat(dosfs, &boot, fat, mod & FSFIXFAT);
154			if (mod & FSFATAL)
155				goto out;
156		} else
157			mod |= FSERROR;
158	}
159
160	if (boot.NumBad)
161		pwarn("%d files, %d free (%d clusters), %d bad (%d clusters)\n",
162		      boot.NumFiles,
163		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree,
164		      boot.NumBad * boot.ClusterSize / 1024, boot.NumBad);
165	else
166		pwarn("%d files, %d free (%d clusters)\n",
167		      boot.NumFiles,
168		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree);
169
170	if (mod && (mod & FSERROR) == 0) {
171		if (mod & FSDIRTY) {
172			if (ask(1, "MARK FILE SYSTEM CLEAN") == 0)
173				mod &= ~FSDIRTY;
174
175			if (mod & FSDIRTY) {
176				pwarn("MARKING FILE SYSTEM CLEAN\n");
177				mod |= writefat(dosfs, &boot, fat, 1);
178			} else {
179				pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
180				mod |= FSERROR; /* file system not clean */
181			}
182		}
183	}
184
185	if (mod & (FSFATAL | FSERROR))
186		goto out;
187
188	ret = 0;
189
190    out:
191	if (finish_dosdirsection)
192		finishDosDirSection();
193	free(fat);
194	close(dosfs);
195
196	if (mod & (FSFATMOD|FSDIRMOD))
197		pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
198
199	return ret;
200}
201