clri.c revision 146757 
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 $alz of BBN Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if 0
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1990, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)clri.c	8.2 (Berkeley) 9/23/93";
42#endif /* not lint */
43#endif
44
45#include <sys/cdefs.h>
46__FBSDID("$FreeBSD: head/sbin/clri/clri.c 146757 2005-05-29 16:07:10Z charnier $");
47
48#include <sys/param.h>
49#include <sys/disklabel.h>
50
51#include <ufs/ufs/dinode.h>
52#include <ufs/ffs/fs.h>
53
54#include <err.h>
55#include <fcntl.h>
56#include <stdlib.h>
57#include <string.h>
58#include <stdio.h>
59#include <unistd.h>
60
61/*
62 * Possible superblock locations ordered from most to least likely.
63 */
64static int sblock_try[] = SBLOCKSEARCH;
65
66static void
67usage(void)
68{
69	(void)fprintf(stderr, "usage: clri special_device inode_number ...\n");
70	exit(1);
71}
72
73int
74main(int argc, char *argv[])
75{
76	struct fs *sbp;
77	struct ufs1_dinode *dp1;
78	struct ufs2_dinode *dp2;
79	char *ibuf[MAXBSIZE];
80	long generation, bsize;
81	off_t offset;
82	int i, fd, inonum;
83	char *fs, sblock[SBLOCKSIZE];
84
85	if (argc < 3)
86		usage();
87
88	fs = *++argv;
89	sbp = NULL;
90
91	/* get the superblock. */
92	if ((fd = open(fs, O_RDWR, 0)) < 0)
93		err(1, "%s", fs);
94	for (i = 0; sblock_try[i] != -1; i++) {
95		if (lseek(fd, (off_t)(sblock_try[i]), SEEK_SET) < 0)
96			err(1, "%s", fs);
97		if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock))
98			errx(1, "%s: can't read superblock", fs);
99		sbp = (struct fs *)sblock;
100		if ((sbp->fs_magic == FS_UFS1_MAGIC ||
101		     (sbp->fs_magic == FS_UFS2_MAGIC &&
102		      sbp->fs_sblockloc == sblock_try[i])) &&
103		    sbp->fs_bsize <= MAXBSIZE &&
104		    sbp->fs_bsize >= (int)sizeof(struct fs))
105			break;
106	}
107	if (sblock_try[i] == -1)
108		errx(2, "cannot find file system superblock");
109	bsize = sbp->fs_bsize;
110
111	/* remaining arguments are inode numbers. */
112	while (*++argv) {
113		/* get the inode number. */
114		if ((inonum = atoi(*argv)) <= 0)
115			errx(1, "%s is not a valid inode number", *argv);
116		(void)printf("clearing %d\n", inonum);
117
118		/* read in the appropriate block. */
119		offset = ino_to_fsba(sbp, inonum);	/* inode to fs blk */
120		offset = fsbtodb(sbp, offset);		/* fs blk disk blk */
121		offset *= DEV_BSIZE;			/* disk blk to bytes */
122
123		/* seek and read the block */
124		if (lseek(fd, offset, SEEK_SET) < 0)
125			err(1, "%s", fs);
126		if (read(fd, ibuf, bsize) != bsize)
127			err(1, "%s", fs);
128
129		if (sbp->fs_magic == FS_UFS2_MAGIC) {
130			/* get the inode within the block. */
131			dp2 = &(((struct ufs2_dinode *)ibuf)
132			    [ino_to_fsbo(sbp, inonum)]);
133
134			/* clear the inode, and bump the generation count. */
135			generation = dp2->di_gen + 1;
136			memset(dp2, 0, sizeof(*dp2));
137			dp2->di_gen = generation;
138		} else {
139			/* get the inode within the block. */
140			dp1 = &(((struct ufs1_dinode *)ibuf)
141			    [ino_to_fsbo(sbp, inonum)]);
142
143			/* clear the inode, and bump the generation count. */
144			generation = dp1->di_gen + 1;
145			memset(dp1, 0, sizeof(*dp1));
146			dp1->di_gen = generation;
147		}
148
149		/* backup and write the block */
150		if (lseek(fd, (off_t)-bsize, SEEK_CUR) < 0)
151			err(1, "%s", fs);
152		if (write(fd, ibuf, bsize) != bsize)
153			err(1, "%s", fs);
154		(void)fsync(fd);
155	}
156	(void)close(fd);
157	exit(0);
158}
159