1.\" Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgment: 14.\" This product includes software developed by Todd C. Miller. 15.\" 4. The name of the author may not be used to endorse or promote products 16.\" derived from this software without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 19.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 20.\" AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21.\" THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22.\" EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28.\" 29.\" $OpenBSD: fsirand.8,v 1.6 1997/02/23 03:58:26 millert Exp $ 30.\" $FreeBSD: src/sbin/fsirand/fsirand.8,v 1.10.2.4 2003/02/23 20:17:15 trhodes Exp $ 31.\" 32.Dd January 25, 1997 33.Dt FSIRAND 8 34.Os 35.Sh NAME 36.Nm fsirand 37.Nd randomize inode generation numbers 38.Sh SYNOPSIS 39.Nm 40.Op Fl b 41.Op Fl f 42.Op Fl p 43.Ar special 44.Op Ar "special ..." 45.Sh DESCRIPTION 46The 47.Nm 48utility installs random generation numbers on all the inodes for 49each file system specified on the command line by 50.Ar special . 51This increases the security of NFS-exported file systems by making 52it difficult to ``guess'' filehandles. 53.Pp 54.Em Note : 55.Xr newfs 8 56now does the equivalent of 57.Nm 58itself so it is no longer necessary to 59run 60.Nm 61by hand on a new file system. It is only used to 62re-randomize or report on an existing file system. 63.Pp 64The 65.Nm 66utility should only be used on an unmounted file system that 67has been checked with 68.Xr fsck 8 69or a file system that is mounted read-only. 70The 71.Nm 72utility may be used on the root file system in single-user mode 73but the system should be rebooted via ``reboot -n'' afterwards. 74.Sh OPTIONS 75The available options are as follows: 76.Bl -tag -width indent 77.It Fl b 78Use the default block size (usually 512 bytes) instead 79of the value gleaned from the disklabel. 80.It Fl f 81Force 82.Nm 83to run even if the file system on 84.Ar special 85is not marked as clean. 86.It Fl p 87Print the current generation numbers for all inodes instead of 88generating new ones. 89.El 90.Sh SEE ALSO 91.Xr fs 5 , 92.Xr fsck 8 , 93.Xr newfs 8 94.Sh HISTORY 95The 96.Nm 97utility appeared in SunOS 3.x. 98.Pp 99This version of 100.Nm 101first appeared in 102.Ox 2.1 . 103.Pp 104A 105.Fx 106version first appeared in 107.Fx 2.2.5 . 108.Sh AUTHORS 109.An Todd C. Miller Aq Mt Todd.Miller@courtesan.com 110.Sh CAVEATS 111Since 112.Nm 113allocates enough memory to hold all the inodes in 114a given cylinder group it may use a large amount 115of memory for large disks with few cylinder groups. 116