1/*	$NetBSD: check.c,v 1.17 2008/06/13 20:46:09 martin Exp $	*/
2
3/*
4 * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
5 * Copyright (c) 1995 Martin Husemann
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28
29#include <sys/cdefs.h>
30#ifndef lint
31__RCSID("$NetBSD: check.c,v 1.17 2008/06/13 20:46:09 martin Exp $");
32#endif /* not lint */
33
34#include <stdlib.h>
35#include <string.h>
36#include <stdio.h>
37#include <unistd.h>
38#include <fcntl.h>
39
40#include "ext.h"
41#include "fsutil.h"
42#include "exitvalues.h"
43
44int
45checkfilesys(const char *filename)
46{
47	int dosfs;
48	struct bootblock boot;
49	struct fatEntry *fat = NULL;
50	int finish_dosdirsection=0;
51	u_int i;
52	int mod = 0;
53	int ret = FSCK_EXIT_CHECK_FAILED;
54
55	rdonly = alwaysno;
56	if (!preen)
57		printf("** %s", filename);
58
59	dosfs = open(filename, rdonly ? O_RDONLY : O_RDWR, 0);
60	if (dosfs < 0 && !rdonly) {
61		dosfs = open(filename, O_RDONLY, 0);
62		if (dosfs >= 0)
63			pwarn(" (NO WRITE)\n");
64		else if (!preen)
65			printf("\n");
66		rdonly = 1;
67	} else if (!preen)
68		printf("\n");
69
70	if (dosfs < 0) {
71		perr("Can't open `%s'", filename);
72		return FSCK_EXIT_CHECK_FAILED;
73	}
74
75	if (readboot(dosfs, &boot) != FSOK) {
76		close(dosfs);
77		printf("\n");
78		return FSCK_EXIT_CHECK_FAILED;
79	}
80
81	if (!preen)  {
82		if (boot.ValidFat < 0)
83			printf("** Phase 1 - Read and Compare FATs\n");
84		else
85			printf("** Phase 1 - Read FAT\n");
86	}
87
88	mod |= readfat(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0, &fat);
89	if (mod & FSFATAL) {
90		close(dosfs);
91		return FSCK_EXIT_CHECK_FAILED;
92	}
93
94	if (boot.ValidFat < 0)
95		for (i = 1; i < boot.FATs; i++) {
96			struct fatEntry *currentFat;
97
98			mod |= readfat(dosfs, &boot, i, &currentFat);
99
100			if (mod & FSFATAL)
101				goto out;
102
103			mod |= comparefat(&boot, fat, currentFat, i);
104			free(currentFat);
105			if (mod & FSFATAL)
106				goto out;
107		}
108
109	if (!preen)
110		printf("** Phase 2 - Check Cluster Chains\n");
111
112	mod |= checkfat(&boot, fat);
113	if (mod & FSFATAL)
114		goto out;
115	/* delay writing FATs */
116
117	if (!preen)
118		printf("** Phase 3 - Checking Directories\n");
119
120	mod |= resetDosDirSection(&boot, fat);
121	finish_dosdirsection = 1;
122	if (mod & FSFATAL)
123		goto out;
124	/* delay writing FATs */
125
126	mod |= handleDirTree(dosfs, &boot, fat);
127	if (mod & FSFATAL)
128		goto out;
129
130	if (!preen)
131		printf("** Phase 4 - Checking for Lost Files\n");
132
133	mod |= checklost(dosfs, &boot, fat);
134	if (mod & FSFATAL)
135		goto out;
136
137	/* now write the FATs */
138	if (mod & FSFATMOD) {
139		if (ask(1, "Update FATs")) {
140			mod |= writefat(dosfs, &boot, fat, mod & FSFIXFAT);
141			if (mod & FSFATAL)
142				goto out;
143		} else
144			mod |= FSERROR;
145	}
146
147	if (boot.NumBad)
148		pwarn("%d files, %d free (%d clusters), %d bad (%d clusters)\n",
149		      boot.NumFiles,
150		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree,
151		      boot.NumBad * boot.ClusterSize / 1024, boot.NumBad);
152	else
153		pwarn("%d files, %d free (%d clusters)\n",
154		      boot.NumFiles,
155		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree);
156
157	if (mod && (mod & FSERROR) == 0) {
158		if (mod & FSDIRTY) {
159			if (ask(1, "MARK FILE SYSTEM CLEAN") == 0)
160				mod &= ~FSDIRTY;
161
162			if (mod & FSDIRTY) {
163				pwarn("MARKING FILE SYSTEM CLEAN\n");
164				mod |= writefat(dosfs, &boot, fat, 1);
165			} else {
166				pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
167				mod |= FSERROR; /* file system not clean */
168			}
169		}
170	}
171
172	if (mod & (FSFATAL | FSERROR))
173		goto out;
174
175	ret = FSCK_EXIT_OK;
176
177    out:
178	if (finish_dosdirsection)
179		finishDosDirSection();
180	free(fat);
181	close(dosfs);
182
183	if (mod & (FSFATMOD|FSDIRMOD))
184		pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
185
186	return ret;
187}
188