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.\" $FreeBSD$ 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. 62It 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 SEE ALSO 92.Xr fs 5 , 93.Xr fsck 8 , 94.Xr newfs 8 95.Sh HISTORY 96The 97.Nm 98utility appeared in SunOS 3.x. 99.Pp 100This version of 101.Nm 102first appeared in 103.Ox 2.1 . 104.Pp 105A 106.Fx 107version first appeared in 108.Fx 2.2.5 . 109.Sh AUTHORS 110.An Todd C. Miller Aq Mt Todd.Miller@courtesan.com 111.Sh CAVEATS 112Since 113.Nm 114allocates enough memory to hold all the inodes in 115a given cylinder group it may use a large amount 116of memory for large disks with few cylinder groups. 117