clri.c revision 96478 
1/*
2 * Copyright (c) 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rich $alz of BBN Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static const char copyright[] =
39"@(#) Copyright (c) 1990, 1993\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)clri.c	8.2 (Berkeley) 9/23/93";
46#endif
47static const char rcsid[] =
48  "$FreeBSD: head/sbin/clri/clri.c 96478 2002-05-12 21:37:08Z phk $";
49#endif /* not lint */
50
51#include <sys/param.h>
52#include <sys/disklabel.h>
53
54#include <ufs/ufs/dinode.h>
55#include <ufs/ffs/fs.h>
56
57#include <err.h>
58#include <fcntl.h>
59#include <stdlib.h>
60#include <string.h>
61#include <stdio.h>
62#include <unistd.h>
63
64static void
65usage(void)
66{
67	(void)fprintf(stderr, "usage: clri filesystem inode ...\n");
68	exit(1);
69}
70
71int
72main(argc, argv)
73	int argc;
74	char *argv[];
75{
76	struct fs *sbp;
77	struct dinode *ip;
78	int fd;
79	struct dinode ibuf[MAXBSIZE / sizeof (struct dinode)];
80	long generation, bsize;
81	off_t offset;
82	int inonum;
83	char *fs, sblock[SBSIZE];
84
85	if (argc < 3)
86		usage();
87
88	fs = *++argv;
89
90	/* get the superblock. */
91	if ((fd = open(fs, O_RDWR, 0)) < 0)
92		err(1, "%s", fs);
93	if (lseek(fd, (off_t)(SBLOCK * DEV_BSIZE), SEEK_SET) < 0)
94		err(1, "%s", fs);
95	if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock))
96		errx(1, "%s: can't read superblock", fs);
97
98	sbp = (struct fs *)sblock;
99	if (sbp->fs_magic != FS_MAGIC)
100		errx(1, "%s: superblock magic number 0x%x, not 0x%x",
101		    fs, sbp->fs_magic, FS_MAGIC);
102	bsize = sbp->fs_bsize;
103
104	/* remaining arguments are inode numbers. */
105	while (*++argv) {
106		/* get the inode number. */
107		if ((inonum = atoi(*argv)) <= 0)
108			errx(1, "%s is not a valid inode number", *argv);
109		(void)printf("clearing %d\n", inonum);
110
111		/* read in the appropriate block. */
112		offset = ino_to_fsba(sbp, inonum);	/* inode to fs blk */
113		offset = fsbtodb(sbp, offset);		/* fs blk disk blk */
114		offset *= DEV_BSIZE;			/* disk blk to bytes */
115
116		/* seek and read the block */
117		if (lseek(fd, offset, SEEK_SET) < 0)
118			err(1, "%s", fs);
119		if (read(fd, ibuf, bsize) != bsize)
120			err(1, "%s", fs);
121
122		/* get the inode within the block. */
123		ip = &ibuf[ino_to_fsbo(sbp, inonum)];
124
125		/* clear the inode, and bump the generation count. */
126		generation = ip->di_gen + 1;
127		memset(ip, 0, sizeof(*ip));
128		ip->di_gen = generation;
129
130		/* backup and write the block */
131		if (lseek(fd, (off_t)-bsize, SEEK_CUR) < 0)
132			err(1, "%s", fs);
133		if (write(fd, ibuf, bsize) != bsize)
134			err(1, "%s", fs);
135		(void)fsync(fd);
136	}
137	(void)close(fd);
138	exit(0);
139}
140