1 /* $OpenBSD: badsect.c,v 1.29 2022/10/12 23:11:32 krw Exp $ */
2 /* $NetBSD: badsect.c,v 1.10 1995/03/18 14:54:28 cgd Exp $ */
3
4 /*
5 * Copyright (c) 1981, 1983, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * badsect
35 *
36 * Badsect takes a list of file-system relative sector numbers
37 * and makes files containing the blocks of which these sectors are a part.
38 * It can be used to contain sectors which have problems. For instance,
39 * this program can be used if the driver for the file system in question
40 * does not support bad block forwarding.
41 */
42 #include <sys/param.h> /* MAXBSIZE DEV_BSIZE isclr */
43 #include <sys/stat.h>
44
45 #include <ufs/ffs/fs.h>
46 #include <ufs/ufs/dinode.h>
47
48 #include <dirent.h>
49 #include <fcntl.h>
50 #include <paths.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <unistd.h>
55 #include <limits.h>
56 #include <err.h>
57
58 static int chkuse(daddr_t, int);
59 static void rdfs(daddr_t, int, char *);
60
61 static union {
62 struct fs fs;
63 char fsx[SBSIZE];
64 } ufs;
65 #define sblock ufs.fs
66 static union {
67 struct cg cg;
68 char cgx[MAXBSIZE];
69 } ucg;
70 #define acg ucg.cg
71 static struct fs *fs;
72 static int fsi;
73 static int errs;
74
75 int
main(int argc,char * argv[])76 main(int argc, char *argv[])
77 {
78 daddr_t number;
79 struct stat stbuf, devstat;
80 struct dirent *dp;
81 DIR *dirp;
82 char name[BUFSIZ];
83 int len;
84
85 if (argc < 3) {
86 fprintf(stderr, "usage: badsect bbdir sector ...\n");
87 exit(1);
88 }
89 if (chdir(argv[1]) == -1 || stat(".", &stbuf) == -1)
90 err(2, "%s", argv[1]);
91
92 strlcpy(name, _PATH_DEV, sizeof name);
93 len = strlen(name);
94 if ((dirp = opendir(name)) == NULL)
95 err(3, "%s", name);
96
97 while ((dp = readdir(dirp)) != NULL) {
98 strlcpy(&name[len], dp->d_name, sizeof name - len);
99 if (stat(name, &devstat) == -1)
100 err(4, "%s", name);
101
102 if (stbuf.st_dev == devstat.st_rdev &&
103 S_ISBLK(devstat.st_mode))
104 break;
105 }
106
107 /*
108 * We've found the block device, but since the filesystem
109 * is mounted, we must write to the raw (character) device
110 * instead. This is not guaranteed to work if someone has a
111 * /dev that doesn't follow standard naming conventions, but
112 * it's all we've got.
113 */
114 name[len] = 'r';
115 strlcpy(&name[len+1], dp->d_name, sizeof name - (len+1));
116 closedir(dirp);
117 if (dp == NULL)
118 err(5, "Cannot find dev 0%o corresponding to %s",
119 stbuf.st_rdev, argv[1]);
120
121 if ((fsi = open(name, O_RDONLY)) == -1)
122 err(6, "%s", name);
123
124 fs = &sblock;
125 rdfs(SBOFF, SBSIZE, (char *)fs);
126 for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
127 number = strtonum(*argv, 0, QUAD_MAX, NULL);
128 if (chkuse(number, 1))
129 continue;
130 if (mknod(*argv, S_IFMT|S_IRUSR|S_IWUSR,
131 dbtofsb(fs, number)) < 0) {
132 warn("%s", *argv);
133 errs++;
134 }
135 }
136 printf("Don't forget to run ``fsck %s''\n", name);
137 exit(errs);
138 }
139
140 static int
chkuse(daddr_t blkno,int cnt)141 chkuse(daddr_t blkno, int cnt)
142 {
143 int cg;
144 daddr_t fsbn, bn;
145
146 fsbn = dbtofsb(fs, blkno);
147 if (fsbn+cnt > fs->fs_ffs1_size) {
148 fprintf(stderr, "block %lld out of range of file system\n",
149 (long long)blkno);
150 return (1);
151 }
152 cg = dtog(fs, fsbn);
153 if (fsbn < cgdmin(fs, cg)) {
154 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
155 fprintf(stderr, "block %lld in non-data area: cannot "
156 "attach\n", (long long)blkno);
157 return (1);
158 }
159 } else {
160 if ((fsbn+cnt) > cgbase(fs, cg+1)) {
161 fprintf(stderr, "block %lld in non-data area: cannot "
162 "attach\n", (long long)blkno);
163 return (1);
164 }
165 }
166 rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
167 (char *)&acg);
168 if (!cg_chkmagic(&acg)) {
169 fprintf(stderr, "cg %d: bad magic number\n", cg);
170 errs++;
171 return (1);
172 }
173 bn = dtogd(fs, fsbn);
174 if (isclr(cg_blksfree(&acg), bn))
175 fprintf(stderr, "Warning: sector %lld is in use\n",
176 (long long)blkno);
177 return (0);
178 }
179
180 /*
181 * read a block from the file system
182 */
183 static void
rdfs(daddr_t bno,int size,char * bf)184 rdfs(daddr_t bno, int size, char *bf)
185 {
186 if (pread(fsi, bf, size, bno * DEV_BSIZE) != size) {
187 fprintf(stderr, "read error: %lld\n", (long long)bno);
188 err(1, "rdfs");
189 }
190 }
191