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 * %sccs.include.redist.c%
9 */
10
11 #ifndef lint
12 static char copyright[] =
13 "@(#) Copyright (c) 1990, 1993\n\
14 The Regents of the University of California. All rights reserved.\n";
15 #endif /* not lint */
16
17 #ifndef lint
18 static char sccsid[] = "@(#)clri.c 8.3 (Berkeley) 04/28/95";
19 #endif /* not lint */
20
21 #include <sys/param.h>
22 #include <sys/time.h>
23
24 #include <ufs/ufs/dinode.h>
25 #include <ufs/ffs/fs.h>
26
27 #include <err.h>
28 #include <errno.h>
29 #include <fcntl.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <stdio.h>
33 #include <unistd.h>
34
35 int
main(argc,argv)36 main(argc, argv)
37 int argc;
38 char *argv[];
39 {
40 register struct fs *sbp;
41 register struct dinode *ip;
42 register int fd;
43 struct dinode ibuf[MAXBSIZE / sizeof (struct dinode)];
44 long generation, bsize;
45 off_t offset;
46 int inonum;
47 char *fs, sblock[SBSIZE];
48
49 if (argc < 3) {
50 (void)fprintf(stderr, "usage: clri filesystem inode ...\n");
51 exit(1);
52 }
53
54 fs = *++argv;
55
56 /* get the superblock. */
57 if ((fd = open(fs, O_RDWR, 0)) < 0)
58 err(1, "%s", fs);
59 if (lseek(fd, (off_t)(SBLOCK * DEV_BSIZE), SEEK_SET) < 0)
60 err(1, "%s", fs);
61 if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock))
62 errx(1, "%s: can't read superblock", fs);
63
64 sbp = (struct fs *)sblock;
65 if (sbp->fs_magic != FS_MAGIC)
66 errx(1, "%s: superblock magic number 0x%x, not 0x%x",
67 fs, sbp->fs_magic, FS_MAGIC);
68 bsize = sbp->fs_bsize;
69
70 /* remaining arguments are inode numbers. */
71 while (*++argv) {
72 /* get the inode number. */
73 if ((inonum = atoi(*argv)) <= 0)
74 errx(1, "%s is not a valid inode number", *argv);
75 (void)printf("clearing %d\n", inonum);
76
77 /* read in the appropriate block. */
78 offset = ino_to_fsba(sbp, inonum); /* inode to fs blk */
79 offset = fsbtodb(sbp, offset); /* fs blk disk blk */
80 offset *= DEV_BSIZE; /* disk blk to bytes */
81
82 /* seek and read the block */
83 if (lseek(fd, offset, SEEK_SET) < 0)
84 err(1, "%s", fs);
85 if (read(fd, ibuf, bsize) != bsize)
86 err(1, "%s", fs);
87
88 /* get the inode within the block. */
89 ip = &ibuf[ino_to_fsbo(sbp, inonum)];
90
91 /* clear the inode, and bump the generation count. */
92 generation = ip->di_gen + 1;
93 memset(ip, 0, sizeof(*ip));
94 ip->di_gen = generation;
95
96 /* backup and write the block */
97 if (lseek(fd, (off_t)-bsize, SEEK_CUR) < 0)
98 err(1, "%s", fs);
99 if (write(fd, ibuf, bsize) != bsize)
100 err(1, "%s", fs);
101 (void)fsync(fd);
102 }
103 (void)close(fd);
104 exit(0);
105 }
106