badsect.c revision 18485
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 41static const char sccsid[] = "@(#)badsect.c 8.1 (Berkeley) 6/5/93"; 42#endif /* not lint */ 43 44/* 45 * badsect 46 * 47 * Badsect takes a list of file-system relative sector numbers 48 * and makes files containing the blocks of which these sectors are a part. 49 * It can be used to contain sectors which have problems if these sectors 50 * are not part of the bad file for the pack (see bad144). For instance, 51 * this program can be used if the driver for the file system in question 52 * does not support bad block forwarding. 53 */ 54#include <sys/param.h> 55#include <sys/stat.h> 56 57#include <ufs/ffs/fs.h> 58#include <ufs/ufs/dinode.h> 59 60#include <dirent.h> 61#include <fcntl.h> 62#include <paths.h> 63#include <stdio.h> 64#include <stdlib.h> 65#include <unistd.h> 66 67union { 68 struct fs fs; 69 char fsx[SBSIZE]; 70} ufs; 71#define sblock ufs.fs 72union { 73 struct cg cg; 74 char cgx[MAXBSIZE]; 75} ucg; 76#define acg ucg.cg 77struct fs *fs; 78int fso, fsi; 79int errs; 80long dev_bsize = 1; 81 82char buf[MAXBSIZE]; 83 84void rdfs __P((daddr_t, int, char *)); 85int chkuse __P((daddr_t, int)); 86 87int 88main(argc, argv) 89 int argc; 90 char *argv[]; 91{ 92 daddr_t diskbn; 93 daddr_t number; 94 struct stat stbuf, devstat; 95 register struct dirent *dp; 96 DIR *dirp; 97 char name[2 * MAXPATHLEN]; 98 char *name_dir_end; 99 100 if (argc < 3) { 101 fprintf(stderr, "usage: badsect bbdir blkno [ blkno ]\n"); 102 exit(1); 103 } 104 if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0) { 105 perror(argv[1]); 106 exit(2); 107 } 108 strcpy(name, _PATH_DEV); 109 if ((dirp = opendir(name)) == NULL) { 110 perror(name); 111 exit(3); 112 } 113 name_dir_end = name + strlen(name); 114 while ((dp = readdir(dirp)) != NULL) { 115 strcpy(name_dir_end, dp->d_name); 116 if (lstat(name, &devstat) < 0) { 117 perror(name); 118 exit(4); 119 } 120 if (stbuf.st_dev == devstat.st_rdev && 121 (devstat.st_mode & IFMT) == IFBLK) 122 break; 123 } 124 closedir(dirp); 125 if (dp == NULL) { 126 printf("Cannot find dev 0%lo corresponding to %s\n", 127 stbuf.st_rdev, argv[1]); 128 exit(5); 129 } 130 /* 131 * Opening of a mounted on device is not allowed. 132 * Attempt to open the raw device instead. 133 */ 134 memcpy(name_dir_end + 1, name_dir_end, strlen(name_dir_end) + 1); 135 *name_dir_end = 'r'; 136 if ((fsi = open(name, O_RDONLY)) < 0) { 137 perror(name); 138 exit(6); 139 } 140 fs = &sblock; 141 rdfs(SBOFF, SBSIZE, (char *)fs); 142 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 143 for (argc -= 2, argv += 2; argc > 0; argc--, argv++) { 144 number = atol(*argv); 145 if (chkuse(number, 1)) 146 continue; 147 /* 148 * Print a warning if converting the block number to a dev_t 149 * will truncate it. badsect was not very useful in versions 150 * of BSD before 4.4 because dev_t was 16 bits and another 151 * bit was lost by bogus sign extensions. 152 */ 153 diskbn = dbtofsb(fs, number); 154 if ((dev_t)diskbn != diskbn) { 155 printf("sector %ld cannot be represented as a dev_t\n", 156 number); 157 errs++; 158 } 159 else if (mknod(*argv, IFMT|0600, (dev_t)diskbn) < 0) { 160 perror(*argv); 161 errs++; 162 } 163 } 164 printf("Don't forget to run ``fsck %s''\n", name); 165 exit(errs); 166} 167 168int 169chkuse(blkno, cnt) 170 daddr_t blkno; 171 int cnt; 172{ 173 int cg; 174 daddr_t fsbn, bn; 175 176 fsbn = dbtofsb(fs, blkno); 177 if ((unsigned)(fsbn+cnt) > fs->fs_size) { 178 printf("block %ld out of range of file system\n", blkno); 179 return (1); 180 } 181 cg = dtog(fs, fsbn); 182 if (fsbn < cgdmin(fs, cg)) { 183 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) { 184 printf("block %ld in non-data area: cannot attach\n", 185 blkno); 186 return (1); 187 } 188 } else { 189 if ((fsbn+cnt) > cgbase(fs, cg+1)) { 190 printf("block %ld in non-data area: cannot attach\n", 191 blkno); 192 return (1); 193 } 194 } 195 rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize, 196 (char *)&acg); 197 if (!cg_chkmagic(&acg)) { 198 fprintf(stderr, "cg %d: bad magic number\n", cg); 199 errs++; 200 return (1); 201 } 202 bn = dtogd(fs, fsbn); 203 if (isclr(cg_blksfree(&acg), bn)) 204 printf("Warning: sector %ld is in use\n", blkno); 205 return (0); 206} 207 208/* 209 * read a block from the file system 210 */ 211void 212rdfs(bno, size, bf) 213 daddr_t bno; 214 int size; 215 char *bf; 216{ 217 int n; 218 219 if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) < 0) { 220 printf("seek error: %ld\n", bno); 221 perror("rdfs"); 222 exit(1); 223 } 224 n = read(fsi, bf, size); 225 if (n != size) { 226 printf("read error: %ld\n", bno); 227 perror("rdfs"); 228 exit(1); 229 } 230} 231