1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 */ 6 7 #ifndef lint 8 char copyright[] = 9 "@(#) Copyright (c) 1983 Regents of the University of California.\n\ 10 All rights reserved.\n"; 11 #endif not lint 12 13 #ifndef lint 14 static char sccsid[] = "@(#)badsect.c 5.2 (Berkeley) 06/24/85"; 15 #endif not lint 16 17 /* 18 * badsect 19 * 20 * Badsect takes a list of file-system relative sector numbers 21 * and makes files containing the blocks of which these sectors are a part. 22 * It can be used to contain sectors which have problems if these sectors 23 * are not part of the bad file for the pack (see bad144). For instance, 24 * this program can be used if the driver for the file system in question 25 * does not support bad block forwarding. 26 */ 27 #include <stdio.h> 28 #include <sys/param.h> 29 #include <sys/fs.h> 30 #include <sys/dir.h> 31 #include <sys/stat.h> 32 #include <sys/inode.h> 33 34 union { 35 struct fs fs; 36 char fsx[SBSIZE]; 37 } ufs; 38 #define sblock ufs.fs 39 union { 40 struct cg cg; 41 char cgx[MAXBSIZE]; 42 } ucg; 43 #define acg ucg.cg 44 struct fs *fs; 45 int fso, fsi; 46 int errs; 47 48 char buf[MAXBSIZE]; 49 50 51 main(argc, argv) 52 int argc; 53 char *argv[]; 54 { 55 daddr_t number; 56 struct stat stbuf, devstat; 57 register struct direct *dp; 58 DIR *dirp; 59 int fd; 60 char name[BUFSIZ]; 61 62 if (argc < 3) { 63 fprintf(stderr, "usage: badsect bbdir blkno [ blkno ]\n"); 64 exit(1); 65 } 66 if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0) { 67 perror(argv[1]); 68 exit(2); 69 } 70 strcpy(name, "/dev/"); 71 if ((dirp = opendir(name)) == NULL) { 72 perror(name); 73 exit(3); 74 } 75 while ((dp = readdir(dirp)) != NULL) { 76 strcpy(&name[5], dp->d_name); 77 if (stat(name, &devstat) < 0) { 78 perror(name); 79 exit(4); 80 } 81 if (stbuf.st_dev == devstat.st_rdev && 82 (devstat.st_mode & IFMT) == IFBLK) 83 break; 84 } 85 closedir(dirp); 86 if (dp == NULL) { 87 printf("Cannot find dev 0%o corresponding to %s\n", 88 stbuf.st_rdev, argv[1]); 89 exit(5); 90 } 91 if ((fsi = open(name, 0)) < 0) { 92 perror(name); 93 exit(6); 94 } 95 fs = &sblock; 96 rdfs(SBLOCK, SBSIZE, (char *)fs); 97 for (argc -= 2, argv += 2; argc > 0; argc--, argv++) { 98 number = atoi(*argv); 99 if (chkuse(number, 1)) 100 continue; 101 if (mknod(*argv, IFMT|0600, dbtofsb(fs, number)) < 0) { 102 perror(*argv); 103 errs++; 104 } 105 } 106 printf("Don't forget to run ``fsck %s''\n", name); 107 exit(errs); 108 } 109 110 chkuse(blkno, cnt) 111 daddr_t blkno; 112 int cnt; 113 { 114 int cg; 115 daddr_t fsbn, bn; 116 117 fsbn = dbtofsb(fs, blkno); 118 if ((unsigned)(fsbn+cnt) > fs->fs_size) { 119 printf("block %d out of range of file system\n", blkno); 120 return (1); 121 } 122 cg = dtog(fs, fsbn); 123 if (fsbn < cgdmin(fs, cg)) { 124 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) { 125 printf("block %d in non-data area: cannot attach\n", 126 blkno); 127 return (1); 128 } 129 } else { 130 if ((fsbn+cnt) > cgbase(fs, cg+1)) { 131 printf("block %d in non-data area: cannot attach\n", 132 blkno); 133 return (1); 134 } 135 } 136 rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize, 137 (char *)&acg); 138 if (acg.cg_magic != CG_MAGIC) { 139 fprintf(stderr, "cg %d: bad magic number\n", cg); 140 errs++; 141 return (1); 142 } 143 bn = dtogd(fs, fsbn); 144 if (isclr(acg.cg_free, bn)) 145 printf("Warning: sector %d is in use\n", blkno); 146 return (0); 147 } 148 149 /* 150 * read a block from the file system 151 */ 152 rdfs(bno, size, bf) 153 int bno, size; 154 char *bf; 155 { 156 int n; 157 158 if (lseek(fsi, bno * DEV_BSIZE, 0) < 0) { 159 printf("seek error: %ld\n", bno); 160 perror("rdfs"); 161 exit(1); 162 } 163 n = read(fsi, bf, size); 164 if(n != size) { 165 printf("read error: %ld\n", bno); 166 perror("rdfs"); 167 exit(1); 168 } 169 } 170