clri.c revision 26438 
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 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
44static char sccsid[] = "@(#)clri.c	8.2 (Berkeley) 9/23/93";
45#endif /* not lint */
46
47#include <sys/param.h>
48#include <sys/time.h>
49
50#include <ufs/ufs/dinode.h>
51#include <ufs/ffs/fs.h>
52
53#include <err.h>
54#include <errno.h>
55#include <fcntl.h>
56#include <stdlib.h>
57#include <string.h>
58#include <stdio.h>
59#include <unistd.h>
60
61int
62main(argc, argv)
63	int argc;
64	char *argv[];
65{
66	register struct fs *sbp;
67	register struct dinode *ip;
68	register int fd;
69	struct dinode ibuf[MAXBSIZE / sizeof (struct dinode)];
70	long generation, bsize;
71	off_t offset;
72	int inonum;
73	char *fs, sblock[SBSIZE];
74
75	if (argc < 3) {
76		(void)fprintf(stderr, "usage: clri filesystem inode ...\n");
77		exit(1);
78	}
79
80	fs = *++argv;
81
82	/* get the superblock. */
83	if ((fd = open(fs, O_RDWR, 0)) < 0)
84		err(1, "%s", fs);
85	if (lseek(fd, (off_t)(SBLOCK * DEV_BSIZE), SEEK_SET) < 0)
86		err(1, "%s", fs);
87	if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock))
88		errx(1, "%s: can't read superblock", fs);
89
90	sbp = (struct fs *)sblock;
91	if (sbp->fs_magic != FS_MAGIC)
92		errx(1, "%s: superblock magic number 0x%x, not 0x%x.",
93		    fs, sbp->fs_magic, FS_MAGIC);
94	bsize = sbp->fs_bsize;
95
96	/* remaining arguments are inode numbers. */
97	while (*++argv) {
98		/* get the inode number. */
99		if ((inonum = atoi(*argv)) <= 0)
100			errx(1, "%s is not a valid inode number.", *argv);
101		(void)printf("clearing %d\n", inonum);
102
103		/* read in the appropriate block. */
104		offset = ino_to_fsba(sbp, inonum);	/* inode to fs blk */
105		offset = fsbtodb(sbp, offset);		/* fs blk disk blk */
106		offset *= DEV_BSIZE;			/* disk blk to bytes */
107
108		/* seek and read the block */
109		if (lseek(fd, offset, SEEK_SET) < 0)
110			err(1, "%s", fs);
111		if (read(fd, ibuf, bsize) != bsize)
112			err(1, "%s", fs);
113
114		/* get the inode within the block. */
115		ip = &ibuf[ino_to_fsbo(sbp, inonum)];
116
117		/* clear the inode, and bump the generation count. */
118		generation = ip->di_gen + 1;
119		memset(ip, 0, sizeof(*ip));
120		ip->di_gen = generation;
121
122		/* backup and write the block */
123		if (lseek(fd, (off_t)-bsize, SEEK_CUR) < 0)
124			err(1, "%s", fs);
125		if (write(fd, ibuf, bsize) != bsize)
126			err(1, "%s", fs);
127		(void)fsync(fd);
128	}
129	(void)close(fd);
130	exit(0);
131}
132