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.\" $DragonFly: src/sbin/fsirand/fsirand.8,v 1.3 2008/05/01 23:36:43 swildner Exp $ 32.\" 33.Dd January 25, 1997 34.Dt FSIRAND 8 35.Os 36.Sh NAME 37.Nm fsirand 38.Nd randomize inode generation numbers 39.Sh SYNOPSIS 40.Nm 41.Op Fl b 42.Op Fl f 43.Op Fl p 44.Ar special 45.Op Ar "special ..." 46.Sh DESCRIPTION 47The 48.Nm 49utility installs random generation numbers on all the inodes for 50each file system specified on the command line by 51.Ar special . 52This increases the security of NFS-exported file systems by making 53it difficult to ``guess'' filehandles. 54.Pp 55.Em Note : 56.Xr newfs 8 57now does the equivalent of 58.Nm 59itself so it is no longer necessary to 60run 61.Nm 62by hand on a new file system. It is only used to 63re-randomize or report on an existing file system. 64.Pp 65The 66.Nm 67utility should only be used on an unmounted file system that 68has been checked with 69.Xr fsck 8 70or a file system that is mounted read-only. 71The 72.Nm 73utility may be used on the root file system in single-user mode 74but the system should be rebooted via ``reboot -n'' afterwards. 75.Sh OPTIONS 76The available options are as follows: 77.Bl -tag -width indent 78.It Fl b 79Use the default block size (usually 512 bytes) instead 80of the value gleaned from the disklabel. 81.It Fl f 82Force 83.Nm 84to run even if the file system on 85.Ar special 86is not marked as clean. 87.It Fl p 88Print the current generation numbers for all inodes instead of 89generating new ones. 90.El 91.Sh CAVEATS 92Since 93.Nm 94allocates enough memory to hold all the inodes in 95a given cylinder group it may use a large amount 96of memory for large disks with few cylinder groups. 97.Sh SEE ALSO 98.Xr fs 5 , 99.Xr fsck 8 , 100.Xr newfs 8 101.Sh HISTORY 102The 103.Nm 104utility appeared in SunOS 3.x. 105.Pp 106This version of 107.Nm 108first appeared in 109.Ox 2.1 . 110.Pp 111A 112.Fx 113version first appeared in 114.Fx 2.2.5 . 115.Sh AUTHORS 116.An Todd C. Miller Aq Todd.Miller@courtesan.com 117