1 static char *sccsid = "@(#)badsect.c 4.3 (Berkeley) 83/02/24"; 2 3 /* 4 * badsect 5 * 6 * Badsect takes a list of file-system relative sector numbers 7 * and makes files containing the blocks of which these sectors are a part. 8 * It can be used to contain sectors which have problems if these sectors 9 * are not part of the bad file for the pack (see bad144). For instance, 10 * this program can be used if the driver for the file system in question 11 * does not support bad block forwarding. 12 */ 13 #include <stdio.h> 14 #include <sys/param.h> 15 #include <sys/fs.h> 16 #include <sys/dir.h> 17 #include <sys/stat.h> 18 #include <sys/inode.h> 19 20 union { 21 struct fs fs; 22 char fsx[SBSIZE]; 23 } ufs; 24 #define sblock ufs.fs 25 union { 26 struct cg cg; 27 char cgx[MAXBSIZE]; 28 } ucg; 29 #define acg ucg.cg 30 struct fs *fs; 31 int fso, fsi; 32 int errs; 33 34 char buf[MAXBSIZE]; 35 36 37 main(argc, argv) 38 int argc; 39 char *argv[]; 40 { 41 daddr_t number; 42 struct stat stbuf, devstat; 43 register struct direct *dp; 44 DIR *dirp; 45 int fd; 46 char name[BUFSIZ]; 47 48 if (argc < 3) { 49 fprintf(stderr, "usage: badsect bbdir blkno [ blkno ]\n"); 50 exit(1); 51 } 52 if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0) { 53 perror(argv[1]); 54 exit(2); 55 } 56 strcpy(name, "/dev/"); 57 if ((dirp = opendir(name)) == NULL) { 58 perror(name); 59 exit(3); 60 } 61 while ((dp = readdir(dirp)) != NULL) { 62 strcpy(&name[5], dp->d_name); 63 if (stat(name, &devstat) < 0) { 64 perror(name); 65 exit(4); 66 } 67 if (stbuf.st_dev == devstat.st_rdev && 68 (devstat.st_mode & IFMT) == IFBLK) 69 break; 70 } 71 closedir(dirp); 72 if (dp == NULL) { 73 printf("Cannot find dev 0%o corresponding to %s\n", 74 stbuf.st_rdev, argv[1]); 75 exit(5); 76 } 77 if ((fsi = open(name, 0)) < 0) { 78 perror(name); 79 exit(6); 80 } 81 fs = &sblock; 82 rdfs(SBLOCK, SBSIZE, (char *)fs); 83 for (argc -= 2, argv += 2; argc > 0; argc--, argv++) { 84 number = atoi(*argv); 85 if (chkuse(number, 1)) 86 continue; 87 if (mknod(*argv, IFMT|0600, dbtofsb(fs, number)) < 0) { 88 perror(*argv); 89 errs++; 90 } 91 } 92 printf("Don't forget to run ``fsck %s''\n", name); 93 exit(errs); 94 } 95 96 chkuse(blkno, cnt) 97 daddr_t blkno; 98 int cnt; 99 { 100 int cg; 101 daddr_t fsbn, bn; 102 103 fsbn = dbtofsb(fs, blkno); 104 if ((unsigned)(fsbn+cnt) > fs->fs_size) { 105 printf("block %d out of range of file system\n", blkno); 106 return (1); 107 } 108 cg = dtog(fs, fsbn); 109 if (fsbn < cgdmin(fs, cg)) { 110 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) { 111 printf("block %d in non-data area: cannot attach\n", 112 blkno); 113 return (1); 114 } 115 } else { 116 if ((fsbn+cnt) > cgbase(fs, cg+1)) { 117 printf("block %d in non-data area: cannot attach\n", 118 blkno); 119 return (1); 120 } 121 } 122 rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize, 123 (char *)&acg); 124 if (acg.cg_magic != CG_MAGIC) { 125 fprintf(stderr, "cg %d: bad magic number\n", cg); 126 errs++; 127 return; 128 } 129 bn = dtogd(fs, fsbn); 130 if (isclr(acg.cg_free, bn)) 131 printf("Warning: sector %d is in use\n", blkno); 132 return (0); 133 } 134 135 /* 136 * read a block from the file system 137 */ 138 rdfs(bno, size, bf) 139 int bno, size; 140 char *bf; 141 { 142 int n; 143 144 if (lseek(fsi, bno * DEV_BSIZE, 0) < 0) { 145 printf("seek error: %ld\n", bno); 146 perror("rdfs"); 147 exit(1); 148 } 149 n = read(fsi, bf, size); 150 if(n != size) { 151 printf("read error: %ld\n", bno); 152 perror("rdfs"); 153 exit(1); 154 } 155 } 156