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From: Trond Myklebust <Trond.Myklebust@netapp.com>
To: Nathan March <nathan@gt.net>
Cc: linux-nfs@vger.kernel.org
Subject: Re: Stale file not being refreshed automatically?
Date: Tue, 25 Jan 2011 18:35:58 -0500	[thread overview]
Message-ID: <1295998558.6867.28.camel@heimdal.trondhjem.org> (raw)
In-Reply-To: <4D3F5CD0.9010204@gt.net>

On Tue, 2011-01-25 at 15:29 -0800, Nathan March wrote: 
> On 1/25/2011 2:28 PM, Trond Myklebust wrote:
> > On Tue, 2011-01-25 at 14:
> > Does '-e' in perl only do a lookup, or does it result in a 'stat()'
> > call? If the latter, then your test is flawed: a stat() is a lookup+a
> > getattr, and the latter can definitely return ESTALE when you are
> > constantly replacing the file.
> >
> > Cheers
> >    Trond
> 
> Hi Trond,
> 
> Has any behavior here changed between 2.6.19 and 2.6.32 that you know of?
> 
> Testing that perl one liner out with a variety of nfs setups we run:
> 
> 2.6.11 client vs 2.6.32 server - no error
> 2.6.11 client vs netapp - no error
> 2.6.19 client vs 2.6.19 server - no error
> 2.6.19 client vs netapp - no error
> 2.6.32 client vs 2.6.32 server - stale file handles
> 2.6.32 client vs netapp - stale file handles
> 
> So it seems to be a client specific change sometime between 2.6.19 and 
> 2.6.32....

You are probably seeing an effect due to attribute caching. Newer
kernels have tighter restrictions on when they are allowed to cache.

IOW: I suspect the above is just a timing artefact that would probably
disappear on a slower machine.

Cheers
  Trond

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@netapp.com
www.netapp.com


      reply	other threads:[~2011-01-25 23:35 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-25 22:11 Stale file not being refreshed automatically? Nathan March
2011-01-25 22:25 ` Nathan March
2011-01-25 22:28 ` Trond Myklebust
2011-01-25 22:38   ` Nathan March
2011-01-25 22:48     ` Trond Myklebust
2011-01-25 22:52       ` Nathan March
2011-01-25 23:24   ` Nathan March
     [not found]   ` <1295994532.6867.12.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
2011-01-25 23:29     ` Nathan March
2011-01-25 23:35       ` Trond Myklebust [this message]

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