UNIONFS(5)                FreeBSD File Formats Manual               UNIONFS(5)

NAME
     unionfs - UNION FS

SYNOPSIS
     To compile this driver into the kernel, place the following lines in your
     kernel configuration file:

           option UNIONFS

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

           unionfs_load="YES"

DESCRIPTION
     The UNIONFS driver is an implementation of a stackable unification
     filesystem.

SEE ALSO
     mount_unionfs(8)

STANDARDS
     J. S. Pendry and M. K. McKusick, Union mounts in 4.4BSD-Lite, Proceedings
     of the USENIX Technical Conference on UNIX and Advanced Computing
     Systems, December 1995.

     P. H. Kamp and R. N. M. Watson, Jails: Confining the omnipotent root,
     Proceedings of the Second International System Administration and
     Networking Conference (SANE2000), May 2000.

HISTORY
     The unionfs device driver first appeared in FreeBSD 5.0.

AUTHORS
     The unionfs device driver was written by Jan-Simon Pendry for 4.4BSD and
     Masanori OZAWA <ozawa@ongs.co.jp> reimplemented the handling of the
     locking for FreeBSD 7.0.  The manual page was written by
     Gordon Bergling <gbe@FreeBSD.org>.

BUGS
     Please see the mount_unionfs(8) manual page for a list of bugs regarding
     the unionfs filesystem.

FreeBSD 13.1-RELEASE-p6         April 27, 2020         FreeBSD 13.1-RELEASE-p6