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random generation numbers; millert ok

/*	$OpenBSD: clri.c,v 1.10 2004/01/25 19:18:54 deraadt Exp $	*/
/*	$NetBSD: clri.c,v 1.9 1995/03/18 14:54:33 cgd Exp $	*/

/*
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rich $alz of BBN Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1990, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)clri.c	8.2 (Berkeley) 9/23/93";
#else
static char rcsid[] = "$OpenBSD: clri.c,v 1.10 2004/01/25 19:18:54 deraadt Exp $";
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>

#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>

int
main(int argc, char *argv[])
{
	struct ufs1_dinode ibuf[MAXBSIZE / sizeof (struct ufs1_dinode)];
	char *fs, sblock[SBSIZE];
	struct ufs1_dinode *ip;
	struct fs *sbp;
	int fd, inonum;
	off_t offset;
	size_t bsize;

	if (argc < 3) {
		fprintf(stderr, "usage: clri filesystem inode ...\n");
		return (1);
	}

	fs = *++argv;

	/* get the superblock. */
	if ((fd = open(fs, O_RDWR, 0)) < 0)
		err(1, "%s", fs);
	if (lseek(fd, (off_t)(SBLOCK * DEV_BSIZE), SEEK_SET) < 0)
		err(1, "%s", fs);
	if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock))
		errx(1, "%s: can't read superblock", fs);

	sbp = (struct fs *)sblock;
	if (sbp->fs_magic != FS_MAGIC)
		errx(1, "%s: superblock magic number 0x%x, not 0x%x",
		    fs, sbp->fs_magic, FS_MAGIC);
	bsize = sbp->fs_bsize;

	/* remaining arguments are inode numbers. */
	while (*++argv) {
		/* get the inode number. */
		if ((inonum = atoi(*argv)) <= 0)
			errx(1, "%s is not a valid inode number", *argv);
		(void)printf("clearing %d\n", inonum);

		/* read in the appropriate block. */
		offset = ino_to_fsba(sbp, inonum);	/* inode to fs blk */
		offset = fsbtodb(sbp, offset);		/* fs blk disk blk */
		offset *= DEV_BSIZE;			/* disk blk to bytes */

		/* seek and read the block */
		if (lseek(fd, offset, SEEK_SET) < 0)
			err(1, "%s", fs);
		if (read(fd, ibuf, bsize) != bsize)
			err(1, "%s", fs);

		/* get the inode within the block. */
		ip = &ibuf[ino_to_fsbo(sbp, inonum)];

		/* clear the inode, and bump the generation count. */
		memset(ip, 0, sizeof(*ip));
		ip->di_gen = arc4random();

		/* backup and write the block */
		if (lseek(fd, offset, SEEK_SET) < 0)
			err(1, "%s", fs);
		if (write(fd, ibuf, bsize) != bsize)
			err(1, "%s", fs);
		(void)fsync(fd);

		if (sbp->fs_inodefmt >= FS_44INODEFMT) {
			/* update after each inode cleared */
			sbp->fs_clean = 0;
			if (lseek(fd, (off_t)(SBLOCK * DEV_BSIZE), SEEK_SET) < 0)
				err(1, "%s", fs);
			if (write(fd, sblock, sizeof(sblock)) != sizeof(sblock))
				errx(1, "%s: can't update superblock", fs);
		}
	}

	return close(fd);
}