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 1.11 2006/04/03 01:58:46 dillon 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/dinode.h> 53 #include <vfs/ufs/fs.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 struct fs sblock, *fs; 66 struct cg acg; 67 int fso, fsi; 68 int errs; 69 long dev_bsize = 1; 70 71 char buf[MAXBSIZE]; 72 73 static void rdfs(daddr_t, int, char *); 74 static int chkuse(daddr_t, int); 75 static void usage(void); 76 77 static void 78 usage(void) 79 { 80 fprintf(stderr, "usage: badsect bbdir blkno ...\n"); 81 exit(1); 82 } 83 84 int 85 main(int argc, char **argv) 86 { 87 daddr_t diskbn; 88 daddr_t number; 89 dev_t dev; 90 struct stat stbuf, devstat; 91 struct dirent *dp; 92 DIR *dirp; 93 char name[2 * MAXPATHLEN]; 94 95 if (argc < 3) 96 usage(); 97 if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0) 98 err(2, "%s", argv[1]); 99 if (strlcpy(name, _PATH_DEV, sizeof(name)) >= sizeof(name)) { 100 errno = ENAMETOOLONG; 101 err(1, "cannot build path name"); 102 } 103 if ((dirp = opendir(name)) == NULL) 104 err(3, "%s", name); 105 while ((dp = readdir(dirp)) != NULL) { 106 strlcpy(name, _PATH_DEV, sizeof(name)); 107 if (strlcat(name, dp->d_name, sizeof(name)) >= sizeof(name)) { 108 errno = ENAMETOOLONG; 109 err(1, "cannot build path name"); 110 } 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); 139 dev = (dev_t)diskbn; 140 if ((daddr_t)dev != diskbn) { 141 printf("sector %ld cannot be represented as a dev_t\n", 142 (long)number); 143 errs++; 144 } else if (mknod(*argv, IFMT | 0600, dev) < 0) { 145 warn("%s", *argv); 146 errs++; 147 } 148 } 149 printf("Don't forget to run ``fsck %s''\n", name); 150 exit(errs); 151 } 152 153 static int 154 chkuse(daddr_t blkno, int cnt) 155 { 156 int cg; 157 daddr_t fsbn, bn; 158 159 fsbn = dbtofsb(fs, blkno); 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) { 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 */ 198 static void 199 rdfs(daddr_t bno, int size, char *bf) 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 } 213