1 /* $OpenBSD: clri.c,v 1.22 2020/06/24 05:46:07 otto Exp $ */
2 /* $NetBSD: clri.c,v 1.19 2005/01/20 15:50:47 xtraeme Exp $ */
3
4 /*
5 * Copyright (c) 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Rich $alz of BBN Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/param.h> /* MAXBSIZE DEV_BSIZE */
37
38 #include <ufs/ufs/dinode.h>
39 #include <ufs/ffs/fs.h>
40
41 #include <err.h>
42 #include <fcntl.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <stdio.h>
46 #include <unistd.h>
47 #include <util.h>
48
49 /*
50 * Possible superblock locations ordered from most to least likely.
51 */
52 static int sblock_try[] = SBLOCKSEARCH;
53
54 static void
usage(void)55 usage(void)
56 {
57 (void)fprintf(stderr, "usage: clri special_device inode_number ...\n");
58 exit(1);
59 }
60
61 int
main(int argc,char * argv[])62 main(int argc, char *argv[])
63 {
64 struct ufs1_dinode *dp1;
65 struct ufs2_dinode *dp2;
66 struct fs *sbp;
67 char *ibuf[MAXBSIZE];
68 char *fs, sblock[SBLOCKSIZE];
69 size_t bsize;
70 off_t offset;
71 int i, fd;
72 ino_t imax, inonum;
73
74 if (argc < 3)
75 usage();
76
77 fs = *++argv;
78 sbp = NULL;
79
80 /* get the superblock. */
81 if ((fd = opendev(fs, O_RDWR, 0, NULL)) == -1)
82 err(1, "%s", fs);
83
84 if (pledge("stdio", NULL) == -1)
85 err(1, "pledge");
86
87 for (i = 0; sblock_try[i] != -1; i++) {
88 offset = (off_t)(sblock_try[i]);
89 if (pread(fd, sblock, sizeof(sblock), offset) != sizeof(sblock))
90 err(1, "%s: can't read superblock", fs);
91 sbp = (struct fs *)sblock;
92 if ((sbp->fs_magic == FS_UFS1_MAGIC ||
93 (sbp->fs_magic == FS_UFS2_MAGIC &&
94 sbp->fs_sblockloc == sblock_try[i])) &&
95 sbp->fs_bsize <= MAXBSIZE &&
96 sbp->fs_bsize >= (int)sizeof(struct fs))
97 break;
98 }
99 if (sblock_try[i] == -1)
100 errx(2, "cannot find file system superblock");
101 bsize = sbp->fs_bsize;
102
103 /* check that inode numbers are valid */
104 imax = sbp->fs_ncg * sbp->fs_ipg;
105 for (i = 1; i < (argc - 1); i++) {
106 const char *errstr;
107 strtonum(argv[i], 1, imax, &errstr);
108 if (errstr)
109 errx(1, "%s is not a valid inode number: %s", argv[i], errstr);
110 }
111
112 /* clear the clean flag in the superblock */
113 if (sbp->fs_inodefmt >= FS_44INODEFMT) {
114 sbp->fs_clean = 0;
115 if (pwrite(fd, sblock, sizeof(sblock), offset) != sizeof(sblock))
116 err(1, "%s: can't update superblock", fs);
117 (void)fsync(fd);
118 }
119
120 /* remaining arguments are inode numbers. */
121 while (*++argv) {
122 /* get the inode number. */
123 inonum = strtonum(*argv, 1, imax, NULL);
124 (void)printf("clearing %llu\n", inonum);
125
126 /* read in the appropriate block. */
127 offset = ino_to_fsba(sbp, inonum); /* inode to fs blk */
128 offset = fsbtodb(sbp, offset); /* fs blk disk blk */
129 offset *= DEV_BSIZE; /* disk blk to bytes */
130
131 /* seek and read the block */
132 if (pread(fd, ibuf, bsize, offset) != bsize)
133 err(1, "%s", fs);
134
135 if (sbp->fs_magic == FS_UFS2_MAGIC) {
136 /* get the inode within the block. */
137 dp2 = &(((struct ufs2_dinode *)ibuf)
138 [ino_to_fsbo(sbp, inonum)]);
139
140 /* clear the inode, and bump the generation count. */
141 memset(dp2, 0, sizeof(*dp2));
142 dp2->di_gen = arc4random();
143 } else {
144 /* get the inode within the block. */
145 dp1 = &(((struct ufs1_dinode *)ibuf)
146 [ino_to_fsbo(sbp, inonum)]);
147
148 /* clear the inode, and bump the generation count. */
149 memset(dp1, 0, sizeof(*dp1));
150 dp1->di_gen = arc4random();
151 }
152
153 /* backup and write the block */
154 if (pwrite(fd, ibuf, bsize, offset) != bsize)
155 err(1, "%s", fs);
156 (void)fsync(fd);
157 }
158 (void)close(fd);
159 exit(0);
160 }
161