badsect.c revision 1.15 
1/*	$NetBSD: badsect.c,v 1.15 1998/03/18 16:50:12 bouyer 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 1.15 1998/03/18 16:50:12 bouyer 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
99int
100main(argc, argv)
101	int argc;
102	char *argv[];
103{
104	daddr_t number;
105	struct stat stbuf, devstat;
106	struct direct *dp;
107	DIR *dirp;
108	char name[MAXPATHLEN];
109	extern char *__progname;
110
111	if (argc < 3) {
112		(void) fprintf(stderr, "Usage: %s bbdir blkno [ blkno ]\n",
113		    __progname);
114		exit(1);
115	}
116	if (chdir(argv[1]) == -1)
117		err(1, "Cannot change directory to `%s'", argv[1]);
118
119	if (stat(".", &stbuf) == -1)
120		err(1, "Cannot stat `%s'", argv[1]);
121
122	(void) strcpy(name, _PATH_DEV);
123	if ((dirp = opendir(name)) == NULL)
124		err(1, "Cannot opendir `%s'", argv[1]);
125
126	while ((dp = readdir(dirp)) != NULL) {
127		(void) snprintf(name, sizeof(name), "%s%s", _PATH_DEV,
128		    dp->d_name);
129		if (stat(name, &devstat) == -1)
130			err(1, "Cannot stat `%s'", name);
131		if (stbuf.st_dev == devstat.st_rdev &&
132		    S_ISBLK(devstat.st_mode))
133			break;
134	}
135	closedir(dirp);
136	if (dp == NULL)
137		errx(1, "Cannot find dev 0%o corresponding to %s",
138		    stbuf.st_rdev, argv[1]);
139
140	/*
141	 * The filesystem is mounted; use the character device instead.
142	 * XXX - Assume that prepending an `r' will give us the name of
143	 * the character device.
144	 */
145	(void) snprintf(name, sizeof(name), "%sr%s", _PATH_DEV, dp->d_name);
146	if ((fsi = open(name, O_RDONLY)) == -1)
147		err(1, "Cannot open `%s'", argv[1]);
148
149	fs = &sblock;
150	rdfs(SBOFF, SBSIZE, (char *)fs);
151	if (fs->fs_magic != FS_MAGIC)
152		if(fs->fs_magic == bswap32(FS_MAGIC))
153			needswap = 1;
154		else
155			errx(1, "%s: bad superblock", name);
156	if (needswap)
157		ffs_sb_swap(fs, fs, 0);
158	dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
159	for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
160		number = atoi(*argv);
161		if (chkuse(number, 1))
162			continue;
163		if (mknod(*argv, S_IFMT|S_IRUSR|S_IWUSR,
164		    dbtofsb(fs, number)) == -1) {
165			warn("Cannot mknod `%s'", *argv);
166			errs++;
167		}
168	}
169
170	warnx("Don't forget to run ``fsck %s''", name);
171	return errs;
172}
173
174int
175chkuse(blkno, cnt)
176	daddr_t blkno;
177	int cnt;
178{
179	int cg;
180	daddr_t fsbn, bn;
181
182	fsbn = dbtofsb(fs, blkno);
183	if ((unsigned)(fsbn+cnt) > fs->fs_size) {
184		warnx("block %d out of range of file system", blkno);
185		return (1);
186	}
187
188	cg = dtog(fs, fsbn);
189	if (fsbn < cgdmin(fs, cg)) {
190		if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
191			warnx("block %d in non-data area: cannot attach",
192			    blkno);
193			return (1);
194		}
195	} else {
196		if ((fsbn+cnt) > cgbase(fs, cg+1)) {
197			warnx("block %d in non-data area: cannot attach",
198			    blkno);
199			return (1);
200		}
201	}
202
203	rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
204	    (char *)&acg);
205
206	if (!cg_chkmagic(&acg, needswap)) {
207		warnx("cg %d: bad magic number", cg);
208		errs++;
209		return (1);
210	}
211
212	bn = dtogd(fs, fsbn);
213	if (isclr(cg_blksfree(&acg, needswap), bn))
214		warnx("Warning: sector %d is in use", blkno);
215
216	return (0);
217}
218
219/*
220 * read a block from the file system
221 */
222void
223rdfs(bno, size, bf)
224	daddr_t bno;
225	int size;
226	char *bf;
227{
228	int n;
229
230	if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) == -1)
231		err(1, "seek error at block %d", bno);
232
233	switch (n = read(fsi, bf, size)) {
234	case -1:
235		err(1, "read error at block %d", bno);
236		break;
237
238	default:
239		if (n == size)
240			return;
241		errx(1, "incomplete read at block %d", bno);
242	}
243}
244