From: Neil Brown <neilb@cse.unsw.edu.au>
To: Stephan von Krawczynski <skraw@ithnet.com>
Date: Thu, 7 Aug 2003 12:27:35 +1000
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Cc: muizelaar@rogers.com, linux-kernel@vger.kernel.org,
       mru@users.sourceforge.net
Subject: Re: FS: hardlinks on directories
In-Reply-To: message from Stephan von Krawczynski on Wednesday August 6
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On Wednesday August 6, skraw@ithnet.com wrote:
> On Wed, 6 Aug 2003 11:12:38 +1000
> Neil Brown <neilb@cse.unsw.edu.au> wrote:
> 
> > On Tuesday August 5, skraw@ithnet.com wrote:
> > > > > Hm, and I just found out that re-exporting "mount --bind" volumes does
> > > > > not work over nfs...
> > > > > 
> > > > > Is this correct, Neil?
> > > > 
> > > > Yes, though there is a reasonable chance that it can be made to work
> > > > with linux-2.6.0 and nfs-utils-1.1.0 (neither of which have been
> > > > released yet:-)
> > > 
> > > Is this a complex issue? Can you imagine a not-too-big sized patch can make
> > > it work in 2.4? What is the basic reason it does in fact not work?
> > 
> > On reflection, it could probably work in 2.4 and current nfs-utils,
> > but admin might be a bit clumsy.
> > 
> > To allow knfsd to see a mountpoint, you have to export the mounted
> > directory with the "nohide" option.  Currently "nohide" only works
> > properly for exports to specific hosts, not to wildcarded hosts or
> > netgroups.
> > So if your /etc/export contains:
> > 
> >   /path/to/some/--bind/mountpoint servername(nohide,....)
> > 
> > for every mountpoint and every server, then it should work.
> 
> Hm, bad luck. I tried and it did not work. I used 2.4.20 kernel, are there
> chances a later kernel might work?

It worked for me.  There is nothing in recent kernels that would
affect this.

What errors do you get?
Can you describe your setup in a bit more detail.

One thing to be careful of is that you cannot export a directory and a
parent of that directory in the same filesystem to the same client.
This tripped me up the first time I tried it.
Here "parent" means in the real filesystem, ignoring any --bind
mounts.

NeilBrown
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