badsect.c revision 78732
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 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1981, 1983, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static const char sccsid[] = "@(#)badsect.c 8.1 (Berkeley) 6/5/93"; 43#endif 44static const char rcsid[] = 45 "$FreeBSD: head/sbin/badsect/badsect.c 78732 2001-06-24 23:04:23Z dd $"; 46#endif /* not lint */ 47 48/* 49 * badsect 50 * 51 * Badsect takes a list of file-system relative sector numbers 52 * and makes files containing the blocks of which these sectors are a part. 53 * It can be used to contain sectors which have problems if these sectors 54 * are not part of the bad file for the pack (see bad144). For instance, 55 * this program can be used if the driver for the file system in question 56 * does not support bad block forwarding. 57 */ 58#include <sys/param.h> 59#include <sys/stat.h> 60 61#include <ufs/ffs/fs.h> 62#include <ufs/ufs/dinode.h> 63 64#include <err.h> 65#include <dirent.h> 66#include <fcntl.h> 67#include <paths.h> 68#include <stdio.h> 69#include <stdlib.h> 70#include <string.h> 71#include <unistd.h> 72 73union { 74 struct fs fs; 75 char fsx[SBSIZE]; 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; 87 88char buf[MAXBSIZE]; 89 90void rdfs __P((daddr_t, int, char *)); 91int chkuse __P((daddr_t, int)); 92 93static void 94usage(void) 95{ 96 fprintf(stderr, "usage: badsect bbdir blkno ...\n"); 97 exit(1); 98} 99 100int 101main(argc, argv) 102 int argc; 103 char *argv[]; 104{ 105 daddr_t diskbn; 106 daddr_t number; 107 struct stat stbuf, devstat; 108 register struct dirent *dp; 109 DIR *dirp; 110 char name[2 * MAXPATHLEN]; 111 char *name_dir_end; 112 113 if (argc < 3) 114 usage(); 115 if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0) 116 err(2, "%s", argv[1]); 117 strcpy(name, _PATH_DEV); 118 if ((dirp = opendir(name)) == NULL) 119 err(3, "%s", name); 120 name_dir_end = name + strlen(name); 121 while ((dp = readdir(dirp)) != NULL) { 122 strcpy(name_dir_end, dp->d_name); 123 if (lstat(name, &devstat) < 0) 124 err(4, "%s", name); 125 if (stbuf.st_dev == devstat.st_rdev && 126 (devstat.st_mode & IFMT) == IFCHR) 127 break; 128 } 129 closedir(dirp); 130 if (dp == NULL) { 131 printf("Cannot find dev 0%lo corresponding to %s\n", 132 (u_long)stbuf.st_rdev, argv[1]); 133 exit(5); 134 } 135 if ((fsi = open(name, O_RDONLY)) < 0) 136 err(6, "%s", name); 137 fs = &sblock; 138 rdfs(SBOFF, SBSIZE, (char *)fs); 139 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 140 for (argc -= 2, argv += 2; argc > 0; argc--, argv++) { 141 number = atol(*argv); 142 if (chkuse(number, 1)) 143 continue; 144 /* 145 * Print a warning if converting the block number to a dev_t 146 * will truncate it. badsect was not very useful in versions 147 * of BSD before 4.4 because dev_t was 16 bits and another 148 * bit was lost by bogus sign extensions. 149 */ 150 diskbn = dbtofsb(fs, number); 151 if ((dev_t)diskbn != diskbn) { 152 printf("sector %ld cannot be represented as a dev_t\n", 153 (long)number); 154 errs++; 155 } 156 else if (mknod(*argv, IFMT|0600, (dev_t)diskbn) < 0) { 157 warn("%s", *argv); 158 errs++; 159 } 160 } 161 printf("Don't forget to run ``fsck %s''\n", name); 162 exit(errs); 163} 164 165int 166chkuse(blkno, cnt) 167 daddr_t blkno; 168 int cnt; 169{ 170 int cg; 171 daddr_t fsbn, bn; 172 173 fsbn = dbtofsb(fs, blkno); 174 if ((unsigned)(fsbn+cnt) > fs->fs_size) { 175 printf("block %ld out of range of file system\n", (long)blkno); 176 return (1); 177 } 178 cg = dtog(fs, fsbn); 179 if (fsbn < cgdmin(fs, cg)) { 180 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) { 181 printf("block %ld in non-data area: cannot attach\n", 182 (long)blkno); 183 return (1); 184 } 185 } else { 186 if ((fsbn+cnt) > cgbase(fs, cg+1)) { 187 printf("block %ld in non-data area: cannot attach\n", 188 (long)blkno); 189 return (1); 190 } 191 } 192 rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize, 193 (char *)&acg); 194 if (!cg_chkmagic(&acg)) { 195 fprintf(stderr, "cg %d: bad magic number\n", cg); 196 errs++; 197 return (1); 198 } 199 bn = dtogd(fs, fsbn); 200 if (isclr(cg_blksfree(&acg), bn)) 201 printf("Warning: sector %ld is in use\n", (long)blkno); 202 return (0); 203} 204 205/* 206 * read a block from the file system 207 */ 208void 209rdfs(bno, size, bf) 210 daddr_t bno; 211 int size; 212 char *bf; 213{ 214 int n; 215 216 if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) < 0) { 217 printf("seek error: %ld\n", (long)bno); 218 err(1, "rdfs"); 219 } 220 n = read(fsi, bf, size); 221 if (n != size) { 222 printf("read error: %ld\n", (long)bno); 223 err(1, "rdfs"); 224 } 225} 226