badsect.c revision 37233
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 "$Id: badsect.c,v 1.5 1998/06/04 06:38:03 charnier Exp $"; 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 <unistd.h> 71 72union { 73 struct fs fs; 74 char fsx[SBSIZE]; 75} ufs; 76#define sblock ufs.fs 77union { 78 struct cg cg; 79 char cgx[MAXBSIZE]; 80} ucg; 81#define acg ucg.cg 82struct fs *fs; 83int fso, fsi; 84int errs; 85long dev_bsize = 1; 86 87char buf[MAXBSIZE]; 88 89void rdfs __P((daddr_t, int, char *)); 90int chkuse __P((daddr_t, int)); 91 92static void 93usage(void) 94{ 95 fprintf(stderr, "usage: badsect bbdir blkno ...\n"); 96 exit(1); 97} 98 99int 100main(argc, argv) 101 int argc; 102 char *argv[]; 103{ 104 daddr_t diskbn; 105 daddr_t number; 106 struct stat stbuf, devstat; 107 register struct dirent *dp; 108 DIR *dirp; 109 char name[2 * MAXPATHLEN]; 110 char *name_dir_end; 111 112 if (argc < 3) 113 usage(); 114 if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0) 115 err(2, "%s", argv[1]); 116 strcpy(name, _PATH_DEV); 117 if ((dirp = opendir(name)) == NULL) 118 err(3, "%s", name); 119 name_dir_end = name + strlen(name); 120 while ((dp = readdir(dirp)) != NULL) { 121 strcpy(name_dir_end, dp->d_name); 122 if (lstat(name, &devstat) < 0) 123 err(4, "%s", name); 124 if (stbuf.st_dev == devstat.st_rdev && 125 (devstat.st_mode & IFMT) == IFBLK) 126 break; 127 } 128 closedir(dirp); 129 if (dp == NULL) { 130 printf("Cannot find dev 0%lo corresponding to %s\n", 131 (u_long)stbuf.st_rdev, argv[1]); 132 exit(5); 133 } 134 /* 135 * Opening of a mounted on device is not allowed. 136 * Attempt to open the raw device instead. 137 */ 138 memcpy(name_dir_end + 1, name_dir_end, strlen(name_dir_end) + 1); 139 *name_dir_end = 'r'; 140 if ((fsi = open(name, O_RDONLY)) < 0) 141 err(6, "%s", name); 142 fs = &sblock; 143 rdfs(SBOFF, SBSIZE, (char *)fs); 144 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 145 for (argc -= 2, argv += 2; argc > 0; argc--, argv++) { 146 number = atol(*argv); 147 if (chkuse(number, 1)) 148 continue; 149 /* 150 * Print a warning if converting the block number to a dev_t 151 * will truncate it. badsect was not very useful in versions 152 * of BSD before 4.4 because dev_t was 16 bits and another 153 * bit was lost by bogus sign extensions. 154 */ 155 diskbn = dbtofsb(fs, number); 156 if ((dev_t)diskbn != diskbn) { 157 printf("sector %ld cannot be represented as a dev_t\n", 158 (long)number); 159 errs++; 160 } 161 else if (mknod(*argv, IFMT|0600, (dev_t)diskbn) < 0) { 162 warn("%s", *argv); 163 errs++; 164 } 165 } 166 printf("Don't forget to run ``fsck %s''\n", name); 167 exit(errs); 168} 169 170int 171chkuse(blkno, cnt) 172 daddr_t blkno; 173 int cnt; 174{ 175 int cg; 176 daddr_t fsbn, bn; 177 178 fsbn = dbtofsb(fs, blkno); 179 if ((unsigned)(fsbn+cnt) > fs->fs_size) { 180 printf("block %ld out of range of file system\n", (long)blkno); 181 return (1); 182 } 183 cg = dtog(fs, fsbn); 184 if (fsbn < cgdmin(fs, cg)) { 185 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) { 186 printf("block %ld in non-data area: cannot attach\n", 187 (long)blkno); 188 return (1); 189 } 190 } else { 191 if ((fsbn+cnt) > cgbase(fs, cg+1)) { 192 printf("block %ld in non-data area: cannot attach\n", 193 (long)blkno); 194 return (1); 195 } 196 } 197 rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize, 198 (char *)&acg); 199 if (!cg_chkmagic(&acg)) { 200 fprintf(stderr, "cg %d: bad magic number\n", cg); 201 errs++; 202 return (1); 203 } 204 bn = dtogd(fs, fsbn); 205 if (isclr(cg_blksfree(&acg), bn)) 206 printf("Warning: sector %ld is in use\n", (long)blkno); 207 return (0); 208} 209 210/* 211 * read a block from the file system 212 */ 213void 214rdfs(bno, size, bf) 215 daddr_t bno; 216 int size; 217 char *bf; 218{ 219 int n; 220 221 if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) < 0) { 222 printf("seek error: %ld\n", (long)bno); 223 err(1, "rdfs"); 224 } 225 n = read(fsi, bf, size); 226 if (n != size) { 227 printf("read error: %ld\n", (long)bno); 228 err(1, "rdfs"); 229 } 230} 231