.\" Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
.\" All rights reserved.
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" 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 acknowledgment:
.\" This product includes software developed by Todd C. Miller.
.\" 4. The name of the author may not be used to endorse or promote products
.\" derived from this software without specific prior written permission.
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.\" $OpenBSD: fsirand.8,v 1.6 1997/02/23 03:58:26 millert Exp $
.Dd January 25, 1997
.Dt FSIRAND 8
.Nd randomize inode generation numbers
.Op Fl b
.Op Fl f
.Op Fl p
.Op Ar "special ..."
utility installs random generation numbers on all the inodes for
each file system specified on the command line by
.Ar special .
This increases the security of NFS-exported file systems by making
it difficult to ``guess'' filehandles.
.Em Note :
.Xr newfs 8
now does the equivalent of
itself so it is no longer necessary to
by hand on a new file system.
It is only used to
re-randomize or report on an existing file system.
utility should only be used on an unmounted file system that
has been checked with
.Xr fsck 8
or a file system that is mounted read-only.
utility may be used on the root file system in single-user mode
but the system should be rebooted via ``reboot -n'' afterwards.
.Bl -tag -width indent
The available options are as follows:
.It Fl b
Use the default block size (usually 512 bytes) instead
of the value gleaned from the disklabel.
.It Fl f
to run even if the file system on
is not marked as clean.
.It Fl p
Print the current generation numbers for all inodes instead of
generating new ones.
allocates enough memory to hold all the inodes in
a given cylinder group it may use a large amount
of memory for large disks with few cylinder groups.
.Sh SEE ALSO
.Xr fs 5 ,
.Xr fsck 8 ,
.Xr newfs 8
utility appeared in SunOS 3.x.
This version of
first appeared in
.Ox 2.1 .
version first appeared in
.Fx 2.2.5 .
.An Todd C. Miller Aq Todd.Miller@courtesan.com