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. 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 $ 36 * $DragonFly: src/sbin/badsect/badsect.c,v 1.6 2005/01/14 07:03:59 joerg Exp $ 37 */ 38 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 52 #include <vfs/ufs/fs.h> 53 #include <vfs/ufs/dinode.h> 54 55 #include <err.h> 56 #include <errno.h> 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 65 union { 66 struct fs fs; 67 char fsx[SBSIZE]; 68 } ufs; 69 #define sblock ufs.fs 70 union { 71 struct cg cg; 72 char cgx[MAXBSIZE]; 73 } ucg; 74 #define acg ucg.cg 75 struct fs *fs; 76 int fso, fsi; 77 int errs; 78 long dev_bsize = 1; 79 80 char buf[MAXBSIZE]; 81 82 void rdfs(daddr_t, int, char *); 83 int chkuse(daddr_t, int); 84 85 static void 86 usage(void) 87 { 88 fprintf(stderr, "usage: badsect bbdir blkno ...\n"); 89 exit(1); 90 } 91 92 int 93 main(int argc, char **argv) 94 { 95 daddr_t diskbn; 96 daddr_t number; 97 struct stat stbuf, devstat; 98 register struct dirent *dp; 99 DIR *dirp; 100 char name[2 * MAXPATHLEN]; 101 102 if (argc < 3) 103 usage(); 104 if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0) 105 err(2, "%s", argv[1]); 106 if (strlcpy(name, _PATH_DEV, sizeof(name)) >= sizeof(name)) { 107 errno = ENAMETOOLONG; 108 err(1, "cannot build path name"); 109 } 110 if ((dirp = opendir(name)) == NULL) 111 err(3, "%s", name); 112 while ((dp = readdir(dirp)) != NULL) { 113 if (strlcat(name, dp->d_name, sizeof(name)) >= sizeof(name)) { 114 errno = ENAMETOOLONG; 115 err(1, "cannot build path name"); 116 } 117 if (lstat(name, &devstat) < 0) 118 err(4, "%s", name); 119 if (stbuf.st_dev == devstat.st_rdev && 120 (devstat.st_mode & IFMT) == IFCHR) 121 break; 122 } 123 closedir(dirp); 124 if (dp == NULL) { 125 printf("Cannot find dev 0%lo corresponding to %s\n", 126 (u_long)stbuf.st_rdev, argv[1]); 127 exit(5); 128 } 129 if ((fsi = open(name, O_RDONLY)) < 0) 130 err(6, "%s", name); 131 fs = &sblock; 132 rdfs(SBOFF, SBSIZE, (char *)fs); 133 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 134 for (argc -= 2, argv += 2; argc > 0; argc--, argv++) { 135 number = atol(*argv); 136 if (chkuse(number, 1)) 137 continue; 138 /* 139 * Print a warning if converting the block number to a dev_t 140 * will truncate it. badsect was not very useful in versions 141 * of BSD before 4.4 because dev_t was 16 bits and another 142 * bit was lost by bogus sign extensions. 143 */ 144 diskbn = dbtofsb(fs, number); 145 if ((dev_t)diskbn != diskbn) { 146 printf("sector %ld cannot be represented as a dev_t\n", 147 (long)number); 148 errs++; 149 } 150 else if (mknod(*argv, IFMT|0600, (dev_t)diskbn) < 0) { 151 warn("%s", *argv); 152 errs++; 153 } 154 } 155 printf("Don't forget to run ``fsck %s''\n", name); 156 exit(errs); 157 } 158 159 int 160 chkuse(daddr_t blkno, int cnt) 161 { 162 int cg; 163 daddr_t fsbn, bn; 164 165 fsbn = dbtofsb(fs, blkno); 166 if ((unsigned)(fsbn+cnt) > fs->fs_size) { 167 printf("block %ld out of range of file system\n", (long)blkno); 168 return (1); 169 } 170 cg = dtog(fs, fsbn); 171 if (fsbn < cgdmin(fs, cg)) { 172 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) { 173 printf("block %ld in non-data area: cannot attach\n", 174 (long)blkno); 175 return (1); 176 } 177 } else { 178 if ((fsbn+cnt) > cgbase(fs, cg+1)) { 179 printf("block %ld in non-data area: cannot attach\n", 180 (long)blkno); 181 return (1); 182 } 183 } 184 rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize, 185 (char *)&acg); 186 if (!cg_chkmagic(&acg)) { 187 fprintf(stderr, "cg %d: bad magic number\n", cg); 188 errs++; 189 return (1); 190 } 191 bn = dtogd(fs, fsbn); 192 if (isclr(cg_blksfree(&acg), bn)) 193 printf("Warning: sector %ld is in use\n", (long)blkno); 194 return (0); 195 } 196 197 /* 198 * read a block from the file system 199 */ 200 void 201 rdfs(daddr_t bno, int size, char *bf) 202 { 203 int n; 204 205 if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) < 0) { 206 printf("seek error: %ld\n", (long)bno); 207 err(1, "rdfs"); 208 } 209 n = read(fsi, bf, size); 210 if (n != size) { 211 printf("read error: %ld\n", (long)bno); 212 err(1, "rdfs"); 213 } 214 } 215