1 /* 2 * Copyright (c) 1981, 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char copyright[] = 10 "@(#) Copyright (c) 1981, 1983, 1993\n\ 11 The Regents of the University of California. All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)badsect.c 8.2 (Berkeley) 05/04/95"; 16 #endif /* not lint */ 17 18 /* 19 * badsect 20 * 21 * Badsect takes a list of file-system relative sector numbers 22 * and makes files containing the blocks of which these sectors are a part. 23 * It can be used to contain sectors which have problems if these sectors 24 * are not part of the bad file for the pack (see bad144). For instance, 25 * this program can be used if the driver for the file system in question 26 * does not support bad block forwarding. 27 */ 28 #include <sys/param.h> 29 #include <sys/dir.h> 30 #include <sys/stat.h> 31 32 #include <ufs/ufs/dinode.h> 33 #include <ufs/ffs/fs.h> 34 35 #include <fcntl.h> 36 #include <paths.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <unistd.h> 40 41 union { 42 struct fs fs; 43 char fsx[SBSIZE]; 44 } ufs; 45 #define sblock ufs.fs 46 union { 47 struct cg cg; 48 char cgx[MAXBSIZE]; 49 } ucg; 50 #define acg ucg.cg 51 struct fs *fs; 52 int fso, fsi; 53 int errs; 54 long dev_bsize = 1; 55 56 char buf[MAXBSIZE]; 57 58 void rdfs __P((daddr_t, int, char *)); 59 int chkuse __P((daddr_t, int)); 60 61 int 62 main(argc, argv) 63 int argc; 64 char *argv[]; 65 { 66 daddr_t number; 67 struct stat stbuf, devstat; 68 register struct direct *dp; 69 DIR *dirp; 70 char name[BUFSIZ]; 71 72 if (argc < 3) { 73 fprintf(stderr, "usage: badsect bbdir blkno [ blkno ]\n"); 74 exit(1); 75 } 76 if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0) { 77 perror(argv[1]); 78 exit(2); 79 } 80 strcpy(name, _PATH_DEV); 81 if ((dirp = opendir(name)) == NULL) { 82 perror(name); 83 exit(3); 84 } 85 while ((dp = readdir(dirp)) != NULL) { 86 strcpy(&name[5], dp->d_name); 87 if (stat(name, &devstat) < 0) { 88 perror(name); 89 exit(4); 90 } 91 if (stbuf.st_dev == devstat.st_rdev && 92 (devstat.st_mode & IFMT) == IFBLK) 93 break; 94 } 95 closedir(dirp); 96 if (dp == NULL) { 97 printf("Cannot find dev 0%o corresponding to %s\n", 98 stbuf.st_rdev, argv[1]); 99 exit(5); 100 } 101 if ((fsi = open(name, 0)) < 0) { 102 perror(name); 103 exit(6); 104 } 105 fs = &sblock; 106 rdfs(SBOFF, SBSIZE, (char *)fs); 107 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 108 for (argc -= 2, argv += 2; argc > 0; argc--, argv++) { 109 number = atoi(*argv); 110 if (chkuse(number, 1)) 111 continue; 112 if (mknod(*argv, IFMT|0600, dbtofsb(fs, number)) < 0) { 113 perror(*argv); 114 errs++; 115 } 116 } 117 printf("Don't forget to run ``fsck %s''\n", name); 118 exit(errs); 119 } 120 121 int 122 chkuse(blkno, cnt) 123 daddr_t blkno; 124 int cnt; 125 { 126 int cg; 127 daddr_t fsbn, bn; 128 129 fsbn = dbtofsb(fs, blkno); 130 if ((unsigned)(fsbn+cnt) > fs->fs_size) { 131 printf("block %d out of range of file system\n", blkno); 132 return (1); 133 } 134 cg = dtog(fs, fsbn); 135 if (fsbn < cgdmin(fs, cg)) { 136 if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) { 137 printf("block %d in non-data area: cannot attach\n", 138 blkno); 139 return (1); 140 } 141 } else { 142 if ((fsbn+cnt) > cgbase(fs, cg+1)) { 143 printf("block %d in non-data area: cannot attach\n", 144 blkno); 145 return (1); 146 } 147 } 148 rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize, 149 (char *)&acg); 150 if (!cg_chkmagic(&acg)) { 151 fprintf(stderr, "cg %d: bad magic number\n", cg); 152 errs++; 153 return (1); 154 } 155 bn = dtogd(fs, fsbn); 156 if (isclr(cg_blksfree(&acg), bn)) 157 printf("Warning: sector %d is in use\n", blkno); 158 return (0); 159 } 160 161 /* 162 * read a block from the file system 163 */ 164 void 165 rdfs(bno, size, bf) 166 daddr_t bno; 167 int size; 168 char *bf; 169 { 170 int n; 171 172 if (lseek(fsi, (off_t)bno * dev_bsize, SEEK_SET) < 0) { 173 printf("seek error: %ld\n", bno); 174 perror("rdfs"); 175 exit(1); 176 } 177 n = read(fsi, bf, size); 178 if (n != size) { 179 printf("read error: %ld\n", bno); 180 perror("rdfs"); 181 exit(1); 182 } 183 } 184