[mythtv-users] Can't reexport SMB share over NFS...what am I doing wrong?

Keith Pyle kpyle at austin.rr.com
Sat Sep 11 03:28:22 UTC 2010


On 09/10/10 14:42, Kevin Kuphal wrote:
> On Fri, Sep 10, 2010 at 1:12 PM, Scott Alfter <scott at alfter.us> wrote:
>
>   
>> > ...
>> >
>> > When I restart NFS, I get this:
>> >
>> > exportfs: Warning: /mnt/media does not support NFS export.
>> >
>>     
> It's been a while since I've tried, but I was under the impression that NFS
> will not re-export mounted filesystems.
>
>   
Kevin is correct.  As noted in "NFS Illustrated" by Brent Callaghan,
"NFS filesystems are generally not reexportable because the filehandle
is generally large enough to contain only the information for one server
unambiguously."  That is, if A (second level client) mounts from B
(first level NFS client) which mounts from C (real NFS server), the
filehandle generated by C might match one generated by B.  He also notes
that "Reexporting also presents problems for AUTH_SYS security based on
server access lists."  Reexporting could allow B to grant access to
filesystems that C intended to restrict.

Keith



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