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1.1 root 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: }
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