badsect.c revision 1.22 
1/*	$NetBSD: badsect.c,v 1.22 2003/04/02 10:39:22 fvdl Exp $	*/
2
3/*
4 * Copyright (c) 1981, 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
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 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38__COPYRIGHT("@(#) Copyright (c) 1981, 1983, 1993\n\
39	The Regents of the University of California.  All rights reserved.\n");
40#endif /* not lint */
41
42#ifndef lint
43#if 0
44static char sccsid[] = "@(#)badsect.c	8.2 (Berkeley) 5/4/95";
45#else
46__RCSID("$NetBSD: badsect.c,v 1.22 2003/04/02 10:39:22 fvdl Exp $");
47#endif
48#endif /* not lint */
49
50/*
51 * badsect
52 *
53 * Badsect takes a list of file-system relative sector numbers
54 * and makes files containing the blocks of which these sectors are a part.
55 * It can be used to contain sectors which have problems if these sectors
56 * are not part of the bad file for the pack (see bad144).  For instance,
57 * this program can be used if the driver for the file system in question
58 * does not support bad block forwarding.
59 */
60#include <sys/param.h>
61#include <sys/dir.h>
62#include <sys/stat.h>
63
64#include <ufs/ufs/dinode.h>
65#include <ufs/ufs/ufs_bswap.h>
66#include <ufs/ffs/fs.h>
67#include <ufs/ffs/ffs_extern.h>
68
69#include <fcntl.h>
70#include <paths.h>
71#include <stdio.h>
72#include <stdlib.h>
73#include <string.h>
74#include <unistd.h>
75#include <err.h>
76
77union {
78	struct	fs fs;
79	char	fsx[SBLOCKSIZE];
80} ufs;
81#define sblock	ufs.fs
82union {
83	struct	cg cg;
84	char	cgx[MAXBSIZE];
85} ucg;
86#define	acg	ucg.cg
87struct	fs *fs;
88int	fso, fsi;
89int	errs;
90long	dev_bsize = 1;
91int needswap = 0;
92int is_ufs2;
93
94char buf[MAXBSIZE];
95
96void	rdfs __P((daddr_t, int, char *));
97int	chkuse __P((daddr_t, int));
98int	main __P((int, char *[]));
99
100const off_t sblock_try[] = SBLOCKSEARCH;
101
102int
103main(argc, argv)
104	int argc;
105	char *argv[];
106{
107	daddr_t number;
108	struct stat stbuf, devstat;
109	struct direct *dp;
110	int i;
111	DIR *dirp;
112	char name[MAXPATHLEN];
113
114	if (argc < 3) {
115		(void) fprintf(stderr, "Usage: %s bbdir blkno [ blkno ]\n",
116		    getprogname());
117		exit(1);
118	}
119	if (chdir(argv[1]) == -1)
120		err(1, "Cannot change directory to `%s'", argv[1]);
121
122	if (stat(".", &stbuf) == -1)
123		err(1, "Cannot stat `%s'", argv[1]);
124
125	(void) strcpy(name, _PATH_DEV);
126	if ((dirp = opendir(name)) == NULL)
127		err(1, "Cannot opendir `%s'", argv[1]);
128
129	while ((dp = readdir(dirp)) != NULL) {
130		(void) snprintf(name, sizeof(name), "%s%s", _PATH_DEV,
131		    dp->d_name);
132		if (stat(name, &devstat) == -1)
133			err(1, "Cannot stat `%s'", name);
134		if (stbuf.st_dev == devstat.st_rdev &&
135		    S_ISBLK(devstat.st_mode))
136			break;
137	}
138	if (dp == NULL) {
139		closedir(dirp);
140		errx(1, "Cannot find dev 0%o corresponding to %s",
141		    stbuf.st_rdev, argv[1]);
142	}
143
144	/*
145	 * The filesystem is mounted; use the character device instead.
146	 * XXX - Assume that prepending an `r' will give us the name of
147	 * the character device.
148	 */
149	(void) snprintf(name, sizeof(name), "%sr%s", _PATH_DEV, dp->d_name);
150
151	closedir(dirp); /* now *dp is invalid */
152
153	if ((fsi = open(name, O_RDONLY)) == -1)
154		err(1, "Cannot open `%s'", argv[1]);
155
156	fs = &sblock;
157
158	for (i = 0; sblock_try[i] != -1; i++) {
159		rdfs(sblock_try[i] / DEV_BSIZE, SBLOCKSIZE, (char *)fs);
160		switch (fs->fs_magic) {
161		case FS_UFS2_MAGIC:
162			is_ufs2 = 1;
163			/* FALLTHROUGH */
164		case FS_UFS1_MAGIC:
165			goto found;
166		case FS_UFS2_MAGIC_SWAPPED:
167			is_ufs2 = 1;
168			/* FALLTHROUGH */
169		case FS_UFS1_MAGIC_SWAPPED:
170			needswap = 1;
171			goto found;
172		default:
173			continue;
174		}
175	}
176	errx(1, "%s: bad superblock", name);
177found:
178	if (needswap)
179		ffs_sb_swap(fs, fs);
180
181	dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
182	for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
183		number = atoi(*argv);
184		if (chkuse(number, 1))
185			continue;
186		if (mknod(*argv, S_IFMT|S_IRUSR|S_IWUSR,
187		    dbtofsb(fs, number)) == -1) {
188			warn("Cannot mknod `%s'", *argv);
189			errs++;
190		}
191	}
192
193	warnx("Don't forget to run ``fsck %s''", name);
194	return errs;
195}
196
197int
198chkuse(blkno, cnt)
199	daddr_t blkno;
200	int cnt;
201{
202	int cg;
203	daddr_t fsbn, bn;
204
205	fsbn = dbtofsb(fs, blkno);
206	if (fsbn+cnt > fs->fs_size) {
207		warnx("block %lld out of range of file system",
208		    (long long)blkno);
209		return (1);
210	}
211
212	cg = dtog(fs, fsbn);
213	if (fsbn < cgdmin(fs, cg)) {
214		if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
215			warnx("block %lld in non-data area: cannot attach",
216			    (long long)blkno);
217			return (1);
218		}
219	} else {
220		if ((fsbn+cnt) > cgbase(fs, cg+1)) {
221			warnx("block %lld in non-data area: cannot attach",
222			    (long long)blkno);
223			return (1);
224		}
225	}
226
227	rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
228	    (char *)&acg);
229
230	if (!cg_chkmagic(&acg, needswap)) {
231		warnx("cg %d: bad magic number", cg);
232		errs++;
233		return (1);
234	}
235
236	bn = dtogd(fs, fsbn);
237	if (isclr(cg_blksfree(&acg, needswap), bn))
238		warnx("Warning: sector %lld is in use", (long long)blkno);
239
240	return (0);
241}
242
243/*
244 * read a block from the file system
245 */
246void
247rdfs(bno, size, bf)
248	daddr_t bno;
249	int size;
250	char *bf;
251{
252	int n;
253
254	if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) == -1)
255		err(1, "seek error at block %lld", (long long)bno);
256
257	switch (n = read(fsi, bf, size)) {
258	case -1:
259		err(1, "read error at block %lld", (long long)bno);
260		break;
261
262	default:
263		if (n == size)
264			return;
265		errx(1, "incomplete read at block %lld", (long long)bno);
266	}
267}
268