fsirand(8) - NetBSD Manual Pages

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FSIRAND(8)              NetBSD System Manager's Manual              FSIRAND(8)


NAME

     fsirand -- install random inode generation numbers in a filesystem


SYNOPSIS

     fsirand [-F] [-p] [-x constant] special


DESCRIPTION

     fsirand writes random inode generation numbers for all the inodes on
     device special.  These random numbers make the NFS filehandles less pre-
     dictable, which was once thought to increase security of exported file
     systems.

     fsirand is no longer relevant because newfs(8) has randomized inode gen-
     eration numbers on all new file systems since NetBSD 2.0, and in any
     case, exporting a file system to NFS clients allows them to traverse the
     entire file system, so making filehandles less predictable does not pre-
     vent clients from finding them anyway.

     fsirand should be run on a clean and unmounted filesystem.

     The options are as follows:

     -F      Indicates that special is a file system image, rather than a
             device name.  special will be accessed `as-is', without requiring
             that it is a raw character device and without attempting to read
             a disklabel.

     -p      Print the current inode generation numbers; the filesystem is not
             modified.

     -x constant
             Exclusive-or the given constant with the random number used in
             the generation process.

     fsirand exits zero on success, non-zero on failure.

     If fsirand receives a SIGINFO signal, statistics on the amount of work
     completed and estimated completion time (in minutes:seconds) will be
     written to the standard error output.


SEE ALSO

     fsck_ffs(8), newfs(8)


HISTORY

     A fsirand utility appeared in NetBSD 1.3.


AUTHORS

     Christos Zoulas <christos@NetBSD.org>.

NetBSD 10.1                   September 11, 2016                   NetBSD 10.1