=== Enable the NFS server to run in a vnet prison

Links: +
link:https://people.freebsd.org/%7Ermacklem/vnet.patch[Source patch for main] URL: link:https://people.freebsd.org/%7Ermacklem/vnet.patch[https://people.freebsd.org/~rmacklem/vnet.patch] +
link:https://people.freebsd.org/%7Ermacklem/nfsd-vnet-prison-setup.txt[Simple Setup Doc] URL: link:https://people.freebsd.org/%7Ermacklem/nfsd-vnet-prison-setup.txt[https://people.freebsd.org/~rmacklem/nfsd-vnet-prison-setup.txt]

Contact: Rick Macklem <rmacklem@freebsd.org>

Several users of FreeBSD identified a need to run the NFS server inside a vnet prison.
This turned into a small project, where I now have a patch that does this.
It is currently available at the above link for testing or on Phabricator as link:https://reviews.freebsd.org/D37519[D37519].
Without this patch, the NFS server cannot be run in a prison.

Not included in the above patch is the ability to run the man:rpc.tlsservd[8] and man:nfsuserd[8] daemons within the vnet prison.
I do now have patches that allow these daemons to run in the vnet prison along with man:mountd[8] and man:nfsd[8], but I would like to get the above patch into main before adding support for man:rpc.tlsservd[8] or man:nfsuserd[8].

At this time, the code needs reviewing and testing.
Hopefully this can be completed in the next few weeks, so that the patch can be committed to `main` and possibly also MFC'd to `stable/13`.

==== To do

* Testing the above patch.
* Reviewing the above patch.
* Doing the same for the man:rpc.tlsservd[8] and man:nfsuserd[8] patches.