Linuxpower: User-Space NFS Under Linux

“Linux has support for the standard network file system
supported by most Unices in two different ways. The first and most
common of these is the user-space NFS daemons. The other is newer
and is a kernel-space implementation of the NFS daemons. In this
article, I will cover the basics of setting up NFS on your machine
when you are using the user-space NFS daemons.”