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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 acknowledgment:
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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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.\" $OpenBSD: fsirand.8,v 1.6 1997/02/23 03:58:26 millert Exp $
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.\" $FreeBSD$
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.\"
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.Dd January 25, 1997
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.Dt FSIRAND 8
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.Os
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.Sh NAME
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.Nm fsirand
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.Nd randomize inode generation numbers
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.Sh SYNOPSIS
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.Nm fsirand
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.Op Fl b
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.Op Fl f
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.Op Fl p
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.Ar special
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.Op Ar "special ..."
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.Sh DESCRIPTION
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The
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.Nm
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command installs random generation numbers on all the inodes for
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each filesystem specified on the command line by
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.Ar special .
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This increases the security of NFS-exported filesystems by making
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it difficult to ``guess'' filehandles.
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.Pp
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.Em Note Ns :
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.Xr newfs 8
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now does the equivalent of
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.Nm
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itself so it is no longer necessary to
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run
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.Nm
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by hand on a new filesystem. It is only used to
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re-randomize or report on an existing filesystem.
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.Pp
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.Nm Fsirand
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should only be used on an unmounted filesystem that
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has been checked with
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.Xr fsck 8
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or a filesystem that is mounted read-only.
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.Nm Fsirand
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may be used on the root filesystem in single-user mode
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but the system should be rebooted via ``reboot -n'' afterwards.
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.Sh OPTIONS
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.Bl -tag -width indent
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The available options are as follows:
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.It Fl b
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Use the default block size (usually 512 bytes) instead
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of the value gleaned from the disklabel.
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.It Fl f
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Force
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.Nm
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to run even if the filesystem on
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.Ar special
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is not marked as clean.
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.It Fl p
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Print the current generation numbers for all inodes instead of
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generating new ones.
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.Sh CAVEATS
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Since
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.Nm
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allocates enough memory to hold all the inodes in
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a given cylinder group it may use a large amount
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of memory for large disks with few cylinder groups.
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.Sh SEE ALSO
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.Xr fs 5 ,
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.Xr fsck 8 ,
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.Xr newfs 8
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.Sh HISTORY
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The
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.Nm
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command appeared in SunOS 3.x.
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.br
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This version of
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.Nm
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first appeared in
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.Ox 2.1 .
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A
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.Bx Free
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version first appeared in
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.Fx 2.2.5 .
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.Sh AUTHORS
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.An Todd C. Miller Aq Todd.Miller@courtesan.com
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