8f89943eda
automatically have random generation numbers. The kenel way of handling those also changed. Further it is advised to run fsirand on all your nfs exported filesystems. the code is mostly copied from OpenBSD, with the randomization chanegd to use /dev/urandom Reviewed by: Garrett Obtained from: OpenBSD
293 lines
8.4 KiB
C
293 lines
8.4 KiB
C
/* $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $ */
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/*
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* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Todd C. Miller.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef lint
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static char rcsid[] = "$OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/disklabel.h>
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#include <sys/ioctl.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <ufs/ffs/fs.h>
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#include <ufs/ufs/dinode.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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void usage __P((int));
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int fsirand __P((char *));
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extern char *__progname;
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int printonly = 0, force = 0, ignorelabel = 0;
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int n, ex = 0;
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struct rlimit rl;
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while ((n = getopt(argc, argv, "bfp")) != -1) {
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switch (n) {
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case 'b':
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ignorelabel++;
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break;
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case 'p':
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printonly++;
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break;
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case 'f':
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force++;
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break;
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default:
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usage(1);
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}
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}
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if (argc - optind < 1)
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usage(1);
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/* Increase our data size to the max */
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if (getrlimit(RLIMIT_DATA, &rl) == 0) {
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rl.rlim_cur = rl.rlim_max;
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if (setrlimit(RLIMIT_DATA, &rl) < 0)
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warn("Can't get resource limit to max data size");
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} else
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warn("Can't get resource limit for data size");
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for (n = optind; n < argc; n++) {
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if (argc - optind != 1)
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(void)puts(argv[n]);
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ex += fsirand(argv[n]);
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if (n < argc - 1)
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putchar('\n');
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}
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exit(ex);
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}
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int
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fsirand(device)
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char *device;
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{
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static struct dinode *inodebuf;
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static size_t oldibufsize;
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size_t ibufsize;
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struct fs *sblock;
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ino_t inumber, maxino;
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daddr_t dblk;
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char sbuf[SBSIZE], sbuftmp[SBSIZE];
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int devfd, n, cg;
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u_int32_t bsize = DEV_BSIZE;
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struct disklabel label;
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if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
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warn("Can't open %s", device);
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return (1);
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}
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/* Get block size (usually 512) from disklabel if possible */
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if (!ignorelabel) {
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if (ioctl(devfd, DIOCGDINFO, &label) < 0)
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warn("Can't read disklabel, using sector size of %d",
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bsize);
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else
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bsize = label.d_secsize;
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}
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/* Read in master superblock */
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(void)memset(&sbuf, 0, sizeof(sbuf));
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sblock = (struct fs *)&sbuf;
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if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
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warn("Can't seek to superblock (%qd) on %s", SBOFF, device);
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return (1);
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}
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if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
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warnx("Can't read superblock on %s: %s", device,
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(n < SBSIZE) ? "short read" : strerror(errno));
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return (1);
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}
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maxino = sblock->fs_ncg * sblock->fs_ipg;
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/* Simple sanity checks on the superblock */
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if (sblock->fs_magic != FS_MAGIC) {
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warnx("Bad magic number in superblock");
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return (1);
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}
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if (sblock->fs_sbsize > SBSIZE) {
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warnx("Superblock size is preposterous");
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return (1);
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}
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if (sblock->fs_postblformat == FS_42POSTBLFMT) {
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warnx("Filesystem format is too old, sorry");
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return (1);
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}
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if (!force && !printonly && sblock->fs_clean != 1) {
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warnx("Filesystem is not clean, fsck %s first.", device);
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return (1);
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}
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/* Make sure backup superblocks are sane. */
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sblock = (struct fs *)&sbuftmp;
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for (cg = 0; cg < sblock->fs_ncg; cg++) {
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dblk = fsbtodb(sblock, cgsblock(sblock, cg));
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if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
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warn("Can't seek to %qd", (off_t)dblk * bsize);
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return (1);
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} else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
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warn("Can't read backup superblock %d on %s: %s",
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cg + 1, device, (n < SBSIZE) ? "short write"
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: strerror(errno));
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return (1);
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}
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if (sblock->fs_magic != FS_MAGIC) {
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warnx("Bad magic number in backup superblock %d on %s",
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cg + 1, device);
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return (1);
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}
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if (sblock->fs_sbsize > SBSIZE) {
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warnx("Size of backup superblock %d on %s is preposterous",
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cg + 1, device);
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return (1);
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}
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}
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sblock = (struct fs *)&sbuf;
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/* XXX - should really cap buffer at 512kb or so */
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ibufsize = sizeof(struct dinode) * sblock->fs_ipg;
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if (oldibufsize < ibufsize) {
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if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL)
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errx(1, "Can't allocate memory for inode buffer");
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oldibufsize = ibufsize;
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}
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if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
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if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0])
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(void)printf("%s was randomized on %s", device,
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ctime((const time_t *)&(sblock->fs_id[0])));
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(void)printf("fsid: %x %x\n", sblock->fs_id[0],
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sblock->fs_id[1]);
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}
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/* Randomize fs_id unless old 4.2BSD filesystem */
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if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
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/* Randomize fs_id and write out new sblock and backups */
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sblock->fs_id[0] = (u_int32_t)time(NULL);
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sblock->fs_id[1] = random();
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if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
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warn("Can't seek to superblock (%qd) on %s", SBOFF,
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device);
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return (1);
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}
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if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
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warn("Can't read superblock on %s: %s", device,
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(n < SBSIZE) ? "short write" : strerror(errno));
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return (1);
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}
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}
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/* For each cylinder group, randomize inodes and update backup sblock */
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for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) {
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/* Update superblock if appropriate */
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if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
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dblk = fsbtodb(sblock, cgsblock(sblock, cg));
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if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
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warn("Can't seek to %qd", (off_t)dblk * bsize);
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return (1);
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} else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
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warn("Can't read backup superblock %d on %s: %s",
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cg + 1, device, (n < SBSIZE) ? "short write"
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: strerror(errno));
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return (1);
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}
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}
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/* Read in inodes, then print or randomize generation nums */
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dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
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if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
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warn("Can't seek to %qd", (off_t)dblk * bsize);
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return (1);
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} else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
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warnx("Can't read inodes: %s",
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(n < ibufsize) ? "short read" : strerror(errno));
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return (1);
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}
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for (n = 0; n < sblock->fs_ipg; n++, inumber++) {
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if (inumber >= ROOTINO) {
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if (printonly)
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(void)printf("ino %d gen %x\n", inumber,
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inodebuf[n].di_gen);
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else
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inodebuf[n].di_gen = random();
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}
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}
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/* Write out modified inodes */
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if (!printonly) {
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if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
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warn("Can't seek to %qd",
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(off_t)dblk * bsize);
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return (1);
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} else if ((n = write(devfd, inodebuf, ibufsize)) !=
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ibufsize) {
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warnx("Can't write inodes: %s",
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(n != ibufsize) ? "short write" :
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strerror(errno));
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return (1);
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}
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}
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}
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(void)close(devfd);
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return(0);
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}
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void
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usage(ex)
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int ex;
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{
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(void)fprintf(stderr, "Usage: %s [ -b ] [ -f ] [ -p ] special [special ...]\n",
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__progname);
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exit(ex);
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}
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