badsect.c revision 1.13 
1/*	$NetBSD: badsect.c,v 1.13 1997/09/14 08:14:32 lukem 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	8.1 (Berkeley) 6/5/93";
45#else
46__RCSID("$NetBSD: badsect.c,v 1.13 1997/09/14 08:14:32 lukem 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/ffs/fs.h>
65#include <ufs/ufs/dinode.h>
66
67#include <fcntl.h>
68#include <paths.h>
69#include <stdio.h>
70#include <stdlib.h>
71#include <string.h>
72#include <unistd.h>
73#include <err.h>
74
75union {
76	struct	fs fs;
77	char	fsx[SBSIZE];
78} ufs;
79#define sblock	ufs.fs
80union {
81	struct	cg cg;
82	char	cgx[MAXBSIZE];
83} ucg;
84#define	acg	ucg.cg
85struct	fs *fs;
86int	fso, fsi;
87int	errs;
88long	dev_bsize = 1;
89
90char buf[MAXBSIZE];
91
92void	rdfs __P((daddr_t, int, char *));
93int	chkuse __P((daddr_t, int));
94int	main __P((int, char *[]));
95
96int
97main(argc, argv)
98	int argc;
99	char *argv[];
100{
101	daddr_t number;
102	struct stat stbuf, devstat;
103	struct direct *dp;
104	DIR *dirp;
105	char name[MAXPATHLEN];
106	extern char *__progname;
107
108	if (argc < 3) {
109		(void) fprintf(stderr, "Usage: %s bbdir blkno [ blkno ]\n",
110		    __progname);
111		exit(1);
112	}
113	if (chdir(argv[1]) == -1)
114		err(1, "Cannot change directory to `%s'", argv[1]);
115
116	if (stat(".", &stbuf) == -1)
117		err(1, "Cannot stat `%s'", argv[1]);
118
119	(void) strcpy(name, _PATH_DEV);
120	if ((dirp = opendir(name)) == NULL)
121		err(1, "Cannot opendir `%s'", argv[1]);
122
123	while ((dp = readdir(dirp)) != NULL) {
124		(void) snprintf(name, sizeof(name), "%s%s", _PATH_DEV,
125		    dp->d_name);
126		if (stat(name, &devstat) == -1)
127			err(1, "Cannot stat `%s'", name);
128		if (stbuf.st_dev == devstat.st_rdev &&
129		    S_ISBLK(devstat.st_mode))
130			break;
131	}
132	closedir(dirp);
133	if (dp == NULL)
134		errx(1, "Cannot find dev 0%o corresponding to %s",
135		    stbuf.st_rdev, argv[1]);
136
137	/*
138	 * The filesystem is mounted; use the character device instead.
139	 * XXX - Assume that prepending an `r' will give us the name of
140	 * the character device.
141	 */
142	(void) snprintf(name, sizeof(name), "%sr%s", _PATH_DEV, dp->d_name);
143	if ((fsi = open(name, O_RDONLY)) == -1)
144		err(1, "Cannot open `%s'", argv[1]);
145
146	fs = &sblock;
147	rdfs(SBOFF, SBSIZE, (char *)fs);
148	dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
149	for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
150		number = atoi(*argv);
151		if (chkuse(number, 1))
152			continue;
153		if (mknod(*argv, S_IFMT|S_IRUSR|S_IWUSR,
154		    dbtofsb(fs, number)) == -1) {
155			warn("Cannot mknod `%s'", *argv);
156			errs++;
157		}
158	}
159
160	warnx("Don't forget to run ``fsck %s''", name);
161	return errs;
162}
163
164int
165chkuse(blkno, cnt)
166	daddr_t blkno;
167	int cnt;
168{
169	int cg;
170	daddr_t fsbn, bn;
171
172	fsbn = dbtofsb(fs, blkno);
173	if ((unsigned)(fsbn+cnt) > fs->fs_size) {
174		warnx("block %d out of range of file system", blkno);
175		return (1);
176	}
177
178	cg = dtog(fs, fsbn);
179	if (fsbn < cgdmin(fs, cg)) {
180		if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
181			warnx("block %d in non-data area: cannot attach",
182			    blkno);
183			return (1);
184		}
185	} else {
186		if ((fsbn+cnt) > cgbase(fs, cg+1)) {
187			warnx("block %d in non-data area: cannot attach",
188			    blkno);
189			return (1);
190		}
191	}
192
193	rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
194	    (char *)&acg);
195
196	if (!cg_chkmagic(&acg)) {
197		warnx("cg %d: bad magic number", cg);
198		errs++;
199		return (1);
200	}
201
202	bn = dtogd(fs, fsbn);
203	if (isclr(cg_blksfree(&acg), bn))
204		warnx("Warning: sector %d is in use", blkno);
205
206	return (0);
207}
208
209/*
210 * read a block from the file system
211 */
212void
213rdfs(bno, size, bf)
214	daddr_t bno;
215	int size;
216	char *bf;
217{
218	int n;
219
220	if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) == -1)
221		err(1, "seek error at block %d", bno);
222
223	switch (n = read(fsi, bf, size)) {
224	case -1:
225		err(1, "read error at block %d", bno);
226		break;
227
228	default:
229		if (n == size)
230			return;
231		errx(1, "incomplete read at block %d", bno);
232	}
233}
234