badsect.c revision 1.1 
1/*
2 * Copyright (c) 1981, 1983 The Regents of the University of California.
3 * 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
35char copyright[] =
36"@(#) Copyright (c) 1981, 1983 The Regents of the University of California.\n\
37 All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)badsect.c	5.9 (Berkeley) 6/1/90";
42#endif /* not lint */
43
44/*
45 * badsect
46 *
47 * Badsect takes a list of file-system relative sector numbers
48 * and makes files containing the blocks of which these sectors are a part.
49 * It can be used to contain sectors which have problems if these sectors
50 * are not part of the bad file for the pack (see bad144).  For instance,
51 * this program can be used if the driver for the file system in question
52 * does not support bad block forwarding.
53 */
54#include <sys/param.h>
55#include <sys/dir.h>
56#include <sys/stat.h>
57#include <ufs/fs.h>
58#include <ufs/dinode.h>
59#include <stdio.h>
60#include <paths.h>
61
62union {
63	struct	fs fs;
64	char	fsx[SBSIZE];
65} ufs;
66#define sblock	ufs.fs
67union {
68	struct	cg cg;
69	char	cgx[MAXBSIZE];
70} ucg;
71#define	acg	ucg.cg
72struct	fs *fs;
73int	fso, fsi;
74int	errs;
75long	dev_bsize = 1;
76
77char buf[MAXBSIZE];
78
79
80main(argc, argv)
81	int argc;
82	char *argv[];
83{
84	daddr_t number;
85	struct stat stbuf, devstat;
86	register struct direct *dp;
87	DIR *dirp;
88	int fd;
89	char name[BUFSIZ];
90
91	if (argc < 3) {
92		fprintf(stderr, "usage: badsect bbdir blkno [ blkno ]\n");
93		exit(1);
94	}
95	if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0) {
96		perror(argv[1]);
97		exit(2);
98	}
99	strcpy(name, _PATH_DEV);
100	if ((dirp = opendir(name)) == NULL) {
101		perror(name);
102		exit(3);
103	}
104	while ((dp = readdir(dirp)) != NULL) {
105		strcpy(&name[5], dp->d_name);
106		if (stat(name, &devstat) < 0) {
107			perror(name);
108			exit(4);
109		}
110		if (stbuf.st_dev == devstat.st_rdev &&
111		    (devstat.st_mode & IFMT) == IFBLK)
112			break;
113	}
114	closedir(dirp);
115	if (dp == NULL) {
116		printf("Cannot find dev 0%o corresponding to %s\n",
117			stbuf.st_rdev, argv[1]);
118		exit(5);
119	}
120	if ((fsi = open(name, 0)) < 0) {
121		perror(name);
122		exit(6);
123	}
124	fs = &sblock;
125	rdfs(SBOFF, SBSIZE, (char *)fs);
126	dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
127	for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
128		number = atoi(*argv);
129		if (chkuse(number, 1))
130			continue;
131		if (mknod(*argv, IFMT|0600, dbtofsb(fs, number)) < 0) {
132			perror(*argv);
133			errs++;
134		}
135	}
136	printf("Don't forget to run ``fsck %s''\n", name);
137	exit(errs);
138}
139
140chkuse(blkno, cnt)
141	daddr_t blkno;
142	int cnt;
143{
144	int cg;
145	daddr_t fsbn, bn;
146
147	fsbn = dbtofsb(fs, blkno);
148	if ((unsigned)(fsbn+cnt) > fs->fs_size) {
149		printf("block %d out of range of file system\n", blkno);
150		return (1);
151	}
152	cg = dtog(fs, fsbn);
153	if (fsbn < cgdmin(fs, cg)) {
154		if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
155			printf("block %d in non-data area: cannot attach\n",
156				blkno);
157			return (1);
158		}
159	} else {
160		if ((fsbn+cnt) > cgbase(fs, cg+1)) {
161			printf("block %d in non-data area: cannot attach\n",
162				blkno);
163			return (1);
164		}
165	}
166	rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
167	    (char *)&acg);
168	if (!cg_chkmagic(&acg)) {
169		fprintf(stderr, "cg %d: bad magic number\n", cg);
170		errs++;
171		return (1);
172	}
173	bn = dtogd(fs, fsbn);
174	if (isclr(cg_blksfree(&acg), bn))
175		printf("Warning: sector %d is in use\n", blkno);
176	return (0);
177}
178
179/*
180 * read a block from the file system
181 */
182rdfs(bno, size, bf)
183	int bno, size;
184	char *bf;
185{
186	int n;
187
188	if (lseek(fsi, bno * dev_bsize, 0) < 0) {
189		printf("seek error: %ld\n", bno);
190		perror("rdfs");
191		exit(1);
192	}
193	n = read(fsi, bf, size);
194	if(n != size) {
195		printf("read error: %ld\n", bno);
196		perror("rdfs");
197		exit(1);
198	}
199}
200