From: Daniel Forrest <forrest@lmcg.wisc.edu>
Subject: Re: disabling caching
Date: Fri, 14 Jul 2006 11:01:01 -0500
Message-ID: <20060714110101.A27025@yoda.lmcg.wisc.edu>
References: <1152864752.28625.30.camel@devel.office.ancoso-development.de>
	<20060714092612.GA11555@janus>
	<1152870249.28636.34.camel@devel.office.ancoso-development.de>
	<1152879442.28635.40.camel@devel.office.ancoso-development.de>
	<1152879562.28633.42.camel@devel.office.ancoso-development.de>
	<76bd70e30607140615x606fb651r61d09d636147336b@mail.gmail.com>
	<1152890024.28625.70.camel@devel.office.ancoso-development.de>
	<20060714102757.A29831@yoda.lmcg.wisc.edu>
	<1152891264.28625.77.camel@devel.office.ancoso-development.de>
Reply-To: Daniel Forrest <forrest@lmcg.wisc.edu>
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Cc: Linux NFS mailing list <nfs@lists.sourceforge.net>
To: Stefan Palme <kleiner@hora-obscura.de>
In-Reply-To: <1152891264.28625.77.camel@devel.office.ancoso-development.de>;
	from kleiner@hora-obscura.de on Fri, Jul 14, 2006 at 05:34:24PM
	+0200
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Stefan,

> > What I have done in similar cases is the following:
> > 
> > 1.) Remote site creates file1
> > 2.) Local site creates foo
> > 3.) Local site tries to link foo to file1 (this should fail)
> > 4.) Local site removes foo
> > 5.) Local site opens file1
> > 
> > In bash the last 4 steps are:
> > 
> > $ touch foo
> > $ ln foo file1
> > ln: `file1': File exists
> > $ rm foo
> > $ cat file1
> > 
> > Perhaps you could try something similar in Python?
> 
> Thank you for that tip, maybe I will use this as a last resort,
> if I don't find the reason for this "misbehaviour", because it 
> looks a little big "ugly" and creates a lot of overhead...

Actually there isn't much overhead, since anything you do that ensures
coherency is going to require a round trip to the NFS server.  If there
is an already existing file that you know of in the directory you can
eliminate "foo" entirely and just use:

$ ln alreadyexists file1
ln: `file1': File exists


And get the same effect.

-- 
Dan


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