linux-kernel - Re: [PATCH] Don't hang user processes if Kerberos ticket for nfs4 mount expires

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Message-ID: <1321640624.2653.5.camel@lade.trondhjem.org>
Date:	Fri, 18 Nov 2011 20:23:44 +0200
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Jim Rees <rees@...ch.edu>
Cc:	John Hughes <john@...va.COM>, Jeff Layton <jlayton@...hat.com>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Don't hang user processes if Kerberos ticket for nfs4
 mount expires

On Fri, 2011-11-18 at 12:54 -0500, Jim Rees wrote: 
> Myklebust, Trond wrote:
> 
>   So what are they supposed to do without tickets? Crash?
> 
> No, why would they want to do that?
> 
> I feel like I've entered the Twilight Zone here, so please continue without
> me while I dig up the relevant background info.

The point is that if the server won't allow them to issue read or write
system calls, then there are 2 options available to them: 

     1. hang until someone renews their ticket 
     2. get an error which means crash, since most (all?) applications
        aren't written according to the non-posix assumption that read
        and write can return EACCES/EKEYEXPIRED errors.



Trond

-- 
Trond Myklebust
Linux NFS client maintainer

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

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