badsect.c revision 1.26 
1/*	$NetBSD: badsect.c,v 1.26 2004/03/21 19:13:59 dsl 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. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1981, 1983, 1993\n\
35	The Regents of the University of California.  All rights reserved.\n");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)badsect.c	8.2 (Berkeley) 5/4/95";
41#else
42__RCSID("$NetBSD: badsect.c,v 1.26 2004/03/21 19:13:59 dsl Exp $");
43#endif
44#endif /* not lint */
45
46/*
47 * badsect
48 *
49 * Badsect takes a list of file-system relative sector numbers
50 * and makes files containing the blocks of which these sectors are a part.
51 * It can be used to contain sectors which have problems if these sectors
52 * are not part of the bad file for the pack (see bad144).  For instance,
53 * this program can be used if the driver for the file system in question
54 * does not support bad block forwarding.
55 */
56#include <sys/param.h>
57#include <sys/dir.h>
58#include <sys/stat.h>
59
60#include <ufs/ufs/dinode.h>
61#include <ufs/ufs/ufs_bswap.h>
62#include <ufs/ffs/fs.h>
63#include <ufs/ffs/ffs_extern.h>
64
65#include <fcntl.h>
66#include <paths.h>
67#include <stdio.h>
68#include <stdlib.h>
69#include <string.h>
70#include <unistd.h>
71#include <err.h>
72
73union {
74	struct	fs fs;
75	char	fsx[SBLOCKSIZE];
76} ufs;
77#define sblock	ufs.fs
78union {
79	struct	cg cg;
80	char	cgx[MAXBSIZE];
81} ucg;
82#define	acg	ucg.cg
83struct	fs *fs;
84int	fso, fsi;
85int	errs;
86long	dev_bsize = 1;
87int needswap = 0;
88int is_ufs2;
89
90char buf[MAXBSIZE];
91
92void	rdfs __P((daddr_t, int, char *));
93int	chkuse __P((daddr_t, int));
94int	main __P((int, char *[]));
95
96const off_t sblock_try[] = SBLOCKSEARCH;
97
98int
99main(argc, argv)
100	int argc;
101	char *argv[];
102{
103	daddr_t number;
104	struct stat stbuf, devstat;
105	struct direct *dp;
106	int i;
107	DIR *dirp;
108	char name[MAXPATHLEN];
109
110	if (argc < 3) {
111		(void) fprintf(stderr, "usage: %s bbdir blkno [ blkno ]\n",
112		    getprogname());
113		exit(1);
114	}
115	if (chdir(argv[1]) == -1)
116		err(1, "Cannot change directory to `%s'", argv[1]);
117
118	if (stat(".", &stbuf) == -1)
119		err(1, "Cannot stat `%s'", argv[1]);
120
121	(void) strlcpy(name, _PATH_DEV, sizeof(name));
122	if ((dirp = opendir(name)) == NULL)
123		err(1, "Cannot opendir `%s'", argv[1]);
124
125	while ((dp = readdir(dirp)) != NULL) {
126		(void) snprintf(name, sizeof(name), "%s%s", _PATH_DEV,
127		    dp->d_name);
128		if (stat(name, &devstat) == -1)
129			err(1, "Cannot stat `%s'", name);
130		if (stbuf.st_dev == devstat.st_rdev &&
131		    S_ISBLK(devstat.st_mode))
132			break;
133	}
134	if (dp == NULL) {
135		closedir(dirp);
136		errx(1, "Cannot find dev 0%o corresponding to %s",
137		    stbuf.st_rdev, argv[1]);
138	}
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
147	closedir(dirp); /* now *dp is invalid */
148
149	if ((fsi = open(name, O_RDONLY)) == -1)
150		err(1, "Cannot open `%s'", argv[1]);
151
152	fs = &sblock;
153
154	for (i = 0; ; i++) {
155		if (sblock_try[i] == -1)
156			errx(1, "%s: bad superblock", name);
157		rdfs(sblock_try[i] / DEV_BSIZE, SBLOCKSIZE, (char *)fs);
158		switch (fs->fs_magic) {
159		case FS_UFS2_MAGIC:
160			is_ufs2 = 1;
161			/* FALLTHROUGH */
162		case FS_UFS1_MAGIC:
163			break;
164		case FS_UFS2_MAGIC_SWAPPED:
165			is_ufs2 = 1;
166			/* FALLTHROUGH */
167		case FS_UFS1_MAGIC_SWAPPED:
168			needswap = 1;
169			ffs_sb_swap(fs, fs);
170			break;
171		default:
172			continue;
173		}
174
175		/* Ensure we don't use 1st alternate if ffsv1 and bs=64k */
176		if (fs->fs_old_flags & FS_FLAGS_UPDATED) {
177			if (fs->fs_sblockloc != sblock_try[i])
178				continue;
179		} else {
180			if (sblock_try[i] == SBLOCK_UFS2)
181				continue;
182		}
183		break;
184	}
185
186	dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
187	for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
188		number = atoi(*argv);
189		if (chkuse(number, 1))
190			continue;
191		if (mknod(*argv, S_IFMT|S_IRUSR|S_IWUSR,
192		    dbtofsb(fs, number)) == -1) {
193			warn("Cannot mknod `%s'", *argv);
194			errs++;
195		}
196	}
197
198	warnx("Don't forget to run ``fsck %s''", name);
199	return errs;
200}
201
202int
203chkuse(blkno, cnt)
204	daddr_t blkno;
205	int cnt;
206{
207	int cg;
208	daddr_t fsbn, bn;
209
210	fsbn = dbtofsb(fs, blkno);
211	if (fsbn+cnt > fs->fs_size) {
212		warnx("block %lld out of range of file system",
213		    (long long)blkno);
214		return (1);
215	}
216
217	cg = dtog(fs, fsbn);
218	if (fsbn < cgdmin(fs, cg)) {
219		if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
220			warnx("block %lld in non-data area: cannot attach",
221			    (long long)blkno);
222			return (1);
223		}
224	} else {
225		if ((fsbn+cnt) > cgbase(fs, cg+1)) {
226			warnx("block %lld in non-data area: cannot attach",
227			    (long long)blkno);
228			return (1);
229		}
230	}
231
232	rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
233	    (char *)&acg);
234
235	if (!cg_chkmagic(&acg, needswap)) {
236		warnx("cg %d: bad magic number", cg);
237		errs++;
238		return (1);
239	}
240
241	bn = dtogd(fs, fsbn);
242	if (isclr(cg_blksfree(&acg, needswap), bn))
243		warnx("Warning: sector %lld is in use", (long long)blkno);
244
245	return (0);
246}
247
248/*
249 * read a block from the file system
250 */
251void
252rdfs(bno, size, bf)
253	daddr_t bno;
254	int size;
255	char *bf;
256{
257	int n;
258
259	if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) == -1)
260		err(1, "seek error at block %lld", (long long)bno);
261
262	switch (n = read(fsi, bf, size)) {
263	case -1:
264		err(1, "read error at block %lld", (long long)bno);
265		break;
266
267	default:
268		if (n == size)
269			return;
270		errx(1, "incomplete read at block %lld", (long long)bno);
271	}
272}
273