From owner-freebsd-stable@FreeBSD.ORG  Fri Mar 16 17:42:09 2012
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Date: Fri, 16 Mar 2012 21:42:33 +0400
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: "Patrick M. Hausen" <hausen@punkt.de>
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Cc: freebsd-stable@freebsd.org
Subject: Re: ZFS & NFS
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On Fri, Mar 16, 2012 at 06:32:43PM +0100, Patrick M. Hausen wrote:

> Hello,
> 
> Am 16.03.2012 um 18:20 schrieb Slawa Olhovchenkov:
> > I do NFSv3 export of ZFS.
> > root from remote host create files on ZFS witch uid 2^32-2:
> > 
> > # ls -l /usr/ports/packages32/
> > total 6
> > drwxr-xr-x  2 4294967294  wheel  5 Mar 17 00:57 All
> > drwxr-xr-x  2 4294967294  wheel  5 Mar 17 00:57 Latest
> > drwxr-xr-x  2 4294967294  wheel  3 Mar 17 00:52 archivers
> > drwxr-xr-x  2 4294967294  wheel  4 Mar 17 00:57 lang
> 
> 
> Yes? This is expected behaviour of NFS. If you don't want that, try
> 
> 	-maproot=root
> 
> either in sharenfs option to zfs or /etc/exports, whichever it is you are using.

hmm...
nobody:*:65534:65534:Unprivileged user:/nonexistent:/usr/sbin/nologin

65534 != 4294967294 (2^16-2 != 2^32-2)

Also, I am think ZFS+NFS will be wrong for UID>2^15.