NULLFS(4)              FreeBSD Kernel Interfaces Manual              NULLFS(4)

NAME

     nullfs - null file system

SYNOPSIS

     To enable support for this driver, place the following line in the kernel
     configuration file:

           options NULLFS

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

           nullfs_load="YES"

DESCRIPTION

     The nullfs driver will permit the FreeBSD kernel to mount a loopback file
     system sub-tree.

EXAMPLES

     To mount a nullfs file system:

           mount_nullfs /usr/ports /home/devel/ports

     It is also possible to define an entry in fstab(5) that looks similar to:

     /usr/ports      /home/devel/ports       nullfs          rw      0       0

SEE ALSO

     fstab(5), mount_nullfs(8)

HISTORY

     The nullfs layer first appeared in 4.4BSD.

AUTHORS

     The nullfs kernel implementation was written by John Heideman.

     This manual page was written by Daniel Gerzo <danger@FreeBSD.org>.

FreeBSD 15.1-STABLE-HBSD        March 15, 2022                       NULLFS(4)