GC !__DragonFly__ section.
[dragonfly.git] / sbin / badsect / badsect.c
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1/*
2 * Copyright (c) 1981, 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#) Copyright (c) 1981, 1983, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)badsect.c 8.1 (Berkeley) 6/5/93
35 * $FreeBSD: src/sbin/badsect/badsect.c,v 1.7.2.2 2001/07/30 10:30:04 dd Exp $
aa681295 36 * $DragonFly: src/sbin/badsect/badsect.c,v 1.10 2005/02/15 01:53:05 cpressey Exp $
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37 */
38
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39/*
40 * badsect
41 *
42 * Badsect takes a list of file-system relative sector numbers
43 * and makes files containing the blocks of which these sectors are a part.
44 * It can be used to contain sectors which have problems if these sectors
45 * are not part of the bad file for the pack (see bad144). For instance,
46 * this program can be used if the driver for the file system in question
47 * does not support bad block forwarding.
48 */
49#include <sys/param.h>
50#include <sys/stat.h>
51
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52#include <vfs/ufs/fs.h>
53#include <vfs/ufs/dinode.h>
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54
55#include <err.h>
14425adc 56#include <errno.h>
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57#include <dirent.h>
58#include <fcntl.h>
59#include <paths.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <unistd.h>
64
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65struct fs sblock, *fs;
66struct cg acg;
67int fso, fsi;
68int errs;
69long dev_bsize = 1;
984263bc 70
aa681295 71char buf[MAXBSIZE];
984263bc 72
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73static void rdfs(daddr_t, int, char *);
74static int chkuse(daddr_t, int);
75static void usage(void);
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76
77static void
78usage(void)
79{
80 fprintf(stderr, "usage: badsect bbdir blkno ...\n");
81 exit(1);
82}
83
84int
b5744197 85main(int argc, char **argv)
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86{
87 daddr_t diskbn;
88 daddr_t number;
e9857395 89 dev_t dev;
984263bc 90 struct stat stbuf, devstat;
aa681295 91 struct dirent *dp;
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92 DIR *dirp;
93 char name[2 * MAXPATHLEN];
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94
95 if (argc < 3)
96 usage();
97 if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0)
98 err(2, "%s", argv[1]);
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99 if (strlcpy(name, _PATH_DEV, sizeof(name)) >= sizeof(name)) {
100 errno = ENAMETOOLONG;
101 err(1, "cannot build path name");
102 }
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103 if ((dirp = opendir(name)) == NULL)
104 err(3, "%s", name);
984263bc 105 while ((dp = readdir(dirp)) != NULL) {
4885373e 106 strlcpy(name, _PATH_DEV, sizeof(name));
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107 if (strlcat(name, dp->d_name, sizeof(name)) >= sizeof(name)) {
108 errno = ENAMETOOLONG;
109 err(1, "cannot build path name");
110 }
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111 if (lstat(name, &devstat) < 0)
112 err(4, "%s", name);
113 if (stbuf.st_dev == devstat.st_rdev &&
114 (devstat.st_mode & IFMT) == IFCHR)
115 break;
116 }
117 closedir(dirp);
118 if (dp == NULL) {
119 printf("Cannot find dev 0%lo corresponding to %s\n",
120 (u_long)stbuf.st_rdev, argv[1]);
121 exit(5);
122 }
123 if ((fsi = open(name, O_RDONLY)) < 0)
124 err(6, "%s", name);
125 fs = &sblock;
126 rdfs(SBOFF, SBSIZE, (char *)fs);
127 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
128 for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
129 number = atol(*argv);
130 if (chkuse(number, 1))
131 continue;
132 /*
133 * Print a warning if converting the block number to a dev_t
134 * will truncate it. badsect was not very useful in versions
135 * of BSD before 4.4 because dev_t was 16 bits and another
136 * bit was lost by bogus sign extensions.
137 */
138 diskbn = dbtofsb(fs, number);
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139 dev = (dev_t)diskbn;
140 if ((daddr_t)dev != diskbn) {
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141 printf("sector %ld cannot be represented as a dev_t\n",
142 (long)number);
143 errs++;
e9857395 144 } else if (mknod(*argv, IFMT | 0600, dev) < 0) {
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145 warn("%s", *argv);
146 errs++;
147 }
148 }
149 printf("Don't forget to run ``fsck %s''\n", name);
150 exit(errs);
151}
152
aa681295 153static int
b5744197 154chkuse(daddr_t blkno, int cnt)
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155{
156 int cg;
157 daddr_t fsbn, bn;
158
159 fsbn = dbtofsb(fs, blkno);
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160 if (fs->fs_size < 0 || fsbn + cnt < 0) {
161 printf("internal error: negative fs size or block number\n");
162 return (1);
163 }
164 if (fsbn + cnt > fs->fs_size) {
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165 printf("block %ld out of range of file system\n", (long)blkno);
166 return (1);
167 }
168 cg = dtog(fs, fsbn);
169 if (fsbn < cgdmin(fs, cg)) {
170 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
171 printf("block %ld in non-data area: cannot attach\n",
172 (long)blkno);
173 return (1);
174 }
175 } else {
176 if ((fsbn+cnt) > cgbase(fs, cg+1)) {
177 printf("block %ld in non-data area: cannot attach\n",
178 (long)blkno);
179 return (1);
180 }
181 }
182 rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
183 (char *)&acg);
184 if (!cg_chkmagic(&acg)) {
185 fprintf(stderr, "cg %d: bad magic number\n", cg);
186 errs++;
187 return (1);
188 }
189 bn = dtogd(fs, fsbn);
190 if (isclr(cg_blksfree(&acg), bn))
191 printf("Warning: sector %ld is in use\n", (long)blkno);
192 return (0);
193}
194
195/*
196 * read a block from the file system
197 */
aa681295 198static void
b5744197 199rdfs(daddr_t bno, int size, char *bf)
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200{
201 int n;
202
203 if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) < 0) {
204 printf("seek error: %ld\n", (long)bno);
205 err(1, "rdfs");
206 }
207 n = read(fsi, bf, size);
208 if (n != size) {
209 printf("read error: %ld\n", (long)bno);
210 err(1, "rdfs");
211 }
212}