check.c revision 79455 
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 79455 2001-07-09 10:35:18Z obrien $";
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(fname)
53	const char *fname;
54{
55	int dosfs;
56	struct bootblock boot;
57	struct fatEntry *fat = NULL;
58	int i, finish_dosdirsection=0;
59	int mod = 0;
60	int ret = 8;
61
62	rdonly = alwaysno;
63	if (!preen)
64		printf("** %s", fname);
65
66	dosfs = open(fname, rdonly ? O_RDONLY : O_RDWR, 0);
67	if (dosfs < 0 && !rdonly) {
68		dosfs = open(fname, O_RDONLY, 0);
69		if (dosfs >= 0)
70			pwarn(" (NO WRITE)\n");
71		else if (!preen)
72			printf("\n");
73		rdonly = 1;
74	} else if (!preen)
75		printf("\n");
76
77	if (dosfs < 0) {
78		perror("Can't open");
79		return 8;
80	}
81
82	if (readboot(dosfs, &boot) != FSOK) {
83		close(dosfs);
84		printf("\n");
85		return 8;
86	}
87
88	if (!preen)  {
89		if (boot.ValidFat < 0)
90			printf("** Phase 1 - Read and Compare FATs\n");
91		else
92			printf("** Phase 1 - Read FAT\n");
93	}
94
95	mod |= readfat(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0, &fat);
96	if (mod & FSFATAL) {
97		close(dosfs);
98		return 8;
99	}
100
101	if (boot.ValidFat < 0)
102		for (i = 1; i < boot.FATs; i++) {
103			struct fatEntry *currentFat;
104
105			mod |= readfat(dosfs, &boot, i, &currentFat);
106
107			if (mod & FSFATAL)
108				goto out;
109
110			mod |= comparefat(&boot, fat, currentFat, i);
111			free(currentFat);
112			if (mod & FSFATAL)
113				goto out;
114		}
115
116	if (!preen)
117		printf("** Phase 2 - Check Cluster Chains\n");
118
119	mod |= checkfat(&boot, fat);
120	if (mod & FSFATAL)
121		goto out;
122	/* delay writing FATs */
123
124	if (!preen)
125		printf("** Phase 3 - Checking Directories\n");
126
127	mod |= resetDosDirSection(&boot, fat);
128	finish_dosdirsection = 1;
129	if (mod & FSFATAL)
130		goto out;
131	/* delay writing FATs */
132
133	mod |= handleDirTree(dosfs, &boot, fat);
134	if (mod & FSFATAL)
135		goto out;
136
137	if (!preen)
138		printf("** Phase 4 - Checking for Lost Files\n");
139
140	mod |= checklost(dosfs, &boot, fat);
141	if (mod & FSFATAL)
142		goto out;
143
144	/* now write the FATs */
145	if (mod & FSFATMOD) {
146		if (ask(1, "Update FATs")) {
147			mod |= writefat(dosfs, &boot, fat, mod & FSFIXFAT);
148			if (mod & FSFATAL)
149				goto out;
150		} else
151			mod |= FSERROR;
152	}
153
154	if (boot.NumBad)
155		pwarn("%d files, %d free (%d clusters), %d bad (%d clusters)\n",
156		      boot.NumFiles,
157		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree,
158		      boot.NumBad * boot.ClusterSize / 1024, boot.NumBad);
159	else
160		pwarn("%d files, %d free (%d clusters)\n",
161		      boot.NumFiles,
162		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree);
163
164	if (mod && (mod & FSERROR) == 0) {
165		if (mod & FSDIRTY) {
166			if (ask(1, "MARK FILE SYSTEM CLEAN") == 0)
167				mod &= ~FSDIRTY;
168
169			if (mod & FSDIRTY) {
170				pwarn("MARKING FILE SYSTEM CLEAN\n");
171				mod |= writefat(dosfs, &boot, fat, 1);
172			} else {
173				pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
174				mod |= FSERROR; /* file system not clean */
175			}
176		}
177	}
178
179	if (mod & (FSFATAL | FSERROR))
180		goto out;
181
182	ret = 0;
183
184    out:
185	if (finish_dosdirsection)
186		finishDosDirSection();
187	free(fat);
188	close(dosfs);
189
190	if (mod & (FSFATMOD|FSDIRMOD))
191		pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
192
193	return ret;
194}
195