From: Neil Horman <nhorman@redhat.com>
Subject: Re: possible client stale filehandle bug?
Date: Wed, 26 Jan 2005 08:07:09 -0500
Message-ID: <41F795FD.8010007@redhat.com>
References: <20050125173945.GU12269@polop.usc.edu> <1106719587.10014.4.camel@lade.trondhjem.org>
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Cc: Garrick Staples <garrick@usc.edu>, nfs@lists.sourceforge.net
To: Trond Myklebust <trond.myklebust@fys.uio.no>
In-Reply-To: <1106719587.10014.4.camel@lade.trondhjem.org>
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

Trond Myklebust wrote:
> ty den 25.01.2005 Klokka 09:39 (-0800) skreiv Garrick Staples:
> 
>>Hi all,
>>   I have lots of storage in a large Solaris samfs environment that is NFS
>>shared to a large number of Solaris and RHEL3 clients.  Under some conditions,
>>linux apps have been getting stale filehandles during the normal course of
>>their activity.  Various file handling syscalls like read() or open() might
>>error.  Lots of renames and setattrs calls seem to trigger the problem.  
>>'ci' and 'cvs commit' are particularly good at this.
> 
> 
> ESTALE is usually a sign that someone is deleting a file on the server
> that is in use by the client. It is a sign that you are doing something
> that violates the caching rules of NFS.
> 
> 
>>It seems that the Solaris clients never report any such errors, only the Linux
>>clients.  However, watching 'snoop' on the Solaris NFS server, I see that it IS
>>returning stale file handles to both OSes, but Solaris clients seem to retry
>>the request several times; and the Linux clients immediately pass the error up
>>to the application.
>>
>>Is there some condition that the 2.4 kernel is handling incorrectly?
> 
> 
> I do not believe that Solaris redrives ESTALE on read, but they may do
> it on open(). Linux does not redrive either case. See the many
> discussions in the NFS list archives for why.
> 

Solaris does in fact retry on operations on ESTALE errors, definately on 
open, and I think on read/readdir/stat/etc. as well.  We had some 
discussion about tht here recently.


-- 
/***************************************************
  *Neil Horman
  *Software Engineer
  *Red Hat, Inc.
  *nhorman@redhat.com
  *gpg keyid: 1024D / 0x92A74FA1
  *http://pgp.mit.edu
  ***************************************************/


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