badsect.c revision 1.18 
1/*	$NetBSD: badsect.c,v 1.18 2001/02/04 19:54:56 christos 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 1.18 2001/02/04 19:54:56 christos 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[SBSIZE];
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;
92
93char buf[MAXBSIZE];
94
95void	rdfs __P((daddr_t, int, char *));
96int	chkuse __P((daddr_t, int));
97int	main __P((int, char *[]));
98
99extern char *__progname;
100
101int
102main(argc, argv)
103	int argc;
104	char *argv[];
105{
106	daddr_t number;
107	struct stat stbuf, devstat;
108	struct direct *dp;
109	DIR *dirp;
110	char name[MAXPATHLEN];
111
112	if (argc < 3) {
113		(void) fprintf(stderr, "Usage: %s bbdir blkno [ blkno ]\n",
114		    __progname);
115		exit(1);
116	}
117	if (chdir(argv[1]) == -1)
118		err(1, "Cannot change directory to `%s'", argv[1]);
119
120	if (stat(".", &stbuf) == -1)
121		err(1, "Cannot stat `%s'", argv[1]);
122
123	(void) strcpy(name, _PATH_DEV);
124	if ((dirp = opendir(name)) == NULL)
125		err(1, "Cannot opendir `%s'", argv[1]);
126
127	while ((dp = readdir(dirp)) != NULL) {
128		(void) snprintf(name, sizeof(name), "%s%s", _PATH_DEV,
129		    dp->d_name);
130		if (stat(name, &devstat) == -1)
131			err(1, "Cannot stat `%s'", name);
132		if (stbuf.st_dev == devstat.st_rdev &&
133		    S_ISBLK(devstat.st_mode))
134			break;
135	}
136	if (dp == NULL) {
137		closedir(dirp);
138		errx(1, "Cannot find dev 0%o corresponding to %s",
139		    stbuf.st_rdev, argv[1]);
140	}
141
142	/*
143	 * The filesystem is mounted; use the character device instead.
144	 * XXX - Assume that prepending an `r' will give us the name of
145	 * the character device.
146	 */
147	(void) snprintf(name, sizeof(name), "%sr%s", _PATH_DEV, dp->d_name);
148
149	closedir(dirp); /* now *dp is invalid */
150
151	if ((fsi = open(name, O_RDONLY)) == -1)
152		err(1, "Cannot open `%s'", argv[1]);
153
154	fs = &sblock;
155	rdfs(SBOFF, SBSIZE, (char *)fs);
156	if (fs->fs_magic != FS_MAGIC) {
157		if(fs->fs_magic == bswap32(FS_MAGIC))
158			needswap = 1;
159		else
160			errx(1, "%s: bad superblock", name);
161	}
162	if (needswap)
163		ffs_sb_swap(fs, fs, 0);
164	dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
165	for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
166		number = atoi(*argv);
167		if (chkuse(number, 1))
168			continue;
169		if (mknod(*argv, S_IFMT|S_IRUSR|S_IWUSR,
170		    dbtofsb(fs, number)) == -1) {
171			warn("Cannot mknod `%s'", *argv);
172			errs++;
173		}
174	}
175
176	warnx("Don't forget to run ``fsck %s''", name);
177	return errs;
178}
179
180int
181chkuse(blkno, cnt)
182	daddr_t blkno;
183	int cnt;
184{
185	int cg;
186	daddr_t fsbn, bn;
187
188	fsbn = dbtofsb(fs, blkno);
189	if ((unsigned)(fsbn+cnt) > fs->fs_size) {
190		warnx("block %d out of range of file system", blkno);
191		return (1);
192	}
193
194	cg = dtog(fs, fsbn);
195	if (fsbn < cgdmin(fs, cg)) {
196		if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
197			warnx("block %d in non-data area: cannot attach",
198			    blkno);
199			return (1);
200		}
201	} else {
202		if ((fsbn+cnt) > cgbase(fs, cg+1)) {
203			warnx("block %d in non-data area: cannot attach",
204			    blkno);
205			return (1);
206		}
207	}
208
209	rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
210	    (char *)&acg);
211
212	if (!cg_chkmagic(&acg, needswap)) {
213		warnx("cg %d: bad magic number", cg);
214		errs++;
215		return (1);
216	}
217
218	bn = dtogd(fs, fsbn);
219	if (isclr(cg_blksfree(&acg, needswap), bn))
220		warnx("Warning: sector %d is in use", blkno);
221
222	return (0);
223}
224
225/*
226 * read a block from the file system
227 */
228void
229rdfs(bno, size, bf)
230	daddr_t bno;
231	int size;
232	char *bf;
233{
234	int n;
235
236	if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) == -1)
237		err(1, "seek error at block %d", bno);
238
239	switch (n = read(fsi, bf, size)) {
240	case -1:
241		err(1, "read error at block %d", bno);
242		break;
243
244	default:
245		if (n == size)
246			return;
247		errx(1, "incomplete read at block %d", bno);
248	}
249}
250