NetBSD/sbin/fsirand/fsirand.c

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/* $NetBSD: fsirand.c,v 1.5 1997/07/06 16:19:40 mycroft Exp $ */
/*
* Copyright (c) 1997 Christos Zoulas. All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christos Zoulas.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 rcsid[] = "$NetBSD: fsirand.c,v 1.5 1997/07/06 16:19:40 mycroft Exp $";
#endif /* lint */
#include <stdio.h>
1997-03-14 03:00:26 +03:00
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <errno.h>
#include <err.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/vnode.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ffs/fs.h>
static void usage __P((void));
static void getsblock __P((int, const char *, struct disklabel *, struct fs *));
static void fixinodes __P((int, struct fs *, struct disklabel *, int, long));
int main __P((int, char *[]));
static void
usage()
{
extern char *__progname;
(void) fprintf(stderr, "%s: [-x <constant>] [-p] <special>\n",
__progname);
exit(1);
}
/* getsblock():
* Return the superblock
*/
static void
getsblock(fd, name, lab, fs)
int fd;
const char *name;
struct disklabel *lab;
struct fs *fs;
{
struct partition *pp = NULL;
char p = name[strlen(name) - 1];
if (p >= 'a' && p <= 'h')
pp = &lab->d_partitions[p - 'a'];
else if (isdigit((unsigned char) p))
pp = &lab->d_partitions[0];
else
errx(1, "Invalid partition `%c'", p);
if (pp->p_fstype != FS_BSDFFS)
errx(1, "Not an FFS partition");
if (lseek(fd, (off_t) SBOFF , SEEK_SET) == (off_t) -1)
err(1, "Cannot seek to superblock");
if (read(fd, fs, SBSIZE) != SBSIZE)
err(1, "Cannot read superblock");
if (fs->fs_magic != FS_MAGIC)
errx(1, "Bad superblock magic number");
if (fs->fs_ncg < 1)
errx(1, "Bad ncg in superblock");
if (fs->fs_cpg < 1)
errx(1, "Bad cpg in superblock");
if (fs->fs_ncg * fs->fs_cpg < fs->fs_ncyl ||
(fs->fs_ncg - 1) * fs->fs_cpg >= fs->fs_ncyl)
errx(1, "Bad number of cylinders in superblock");
if (fs->fs_sbsize > SBSIZE)
errx(1, "Superblock too large");
}
/* fixinodes():
* Randomize the inode generation numbers
*/
static void
fixinodes(fd, fs, lab, pflag, xorval)
int fd;
struct fs *fs;
struct disklabel *lab;
int pflag;
long xorval;
{
int inopb = INOPB(fs);
int size = inopb * sizeof(struct dinode);
struct dinode *dibuf, *dip;
int ino, imax;
if ((dibuf = malloc(size)) == NULL)
err(1, "Out of memory");
for (ino = 0, imax = fs->fs_ipg * fs->fs_ncg; ino < imax;) {
off_t sp;
sp = (off_t) fsbtodb(fs, ino_to_fsba(fs, ino)) *
(off_t) lab->d_secsize;
if (lseek(fd, sp, SEEK_SET) == (off_t) -1)
err(1, "Seeking to inode %d failed", ino);
if (read(fd, dibuf, size) != size)
err(1, "Reading inodes %d+%d failed", ino, inopb);
for (dip = dibuf; dip < &dibuf[inopb]; dip++) {
if (pflag)
printf("ino %d gen %x\n", ino, dip->di_gen);
else
dip->di_gen = random() ^ xorval;
if (++ino > imax)
errx(1, "Exceeded number of inodes");
}
if (pflag)
continue;
if (lseek(fd, sp, SEEK_SET) == (off_t) -1)
err(1, "Seeking to inode %d failed", ino);
if (write(fd, dibuf, size) != size)
err(1, "Writing inodes %d+%d failed", ino, inopb);
}
free(dibuf);
}
int
main(argc, argv)
int argc;
char *argv[];
{
char buf[SBSIZE];
struct fs *fs = (struct fs *) buf;
struct disklabel lab;
int fd, c;
long xorval = 0;
char *ep;
struct timeval tv;
int pflag = 0;
while ((c = getopt(argc, argv, "px:")) != -1)
switch (c) {
case 'p':
pflag++;
break;
case 'x':
xorval = strtol(optarg, &ep, 0);
if ((xorval == LONG_MIN || xorval == LONG_MAX) &&
errno == ERANGE)
err(1, "Out of range constant");
if (*ep)
errx(1, "Bad constant");
break;
default:
usage();
}
argv += optind;
argc -= optind;
if (argc != 1)
usage();
(void) gettimeofday(&tv, NULL);
srandom((unsigned) tv.tv_usec);
if ((fd = open(argv[0], pflag ? O_RDONLY : O_RDWR)) == -1)
err(1, "Cannot open `%s'", argv[0]);
if (ioctl(fd, DIOCGDINFO, &lab) == -1)
err(1, "Cannot get label information");
getsblock(fd, argv[0], &lab, fs);
fixinodes(fd, fs, &lab, pflag, xorval);
(void) close(fd);
return 0;
}