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

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Message-ID: <4EC50882.2080803@Calva.COM>
Date:	Thu, 17 Nov 2011 14:13:38 +0100
From:	John Hughes <john@...va.COM>
To:	Jeff Layton <jlayton@...hat.com>
CC:	Jim Rees <rees@...ch.edu>,
	Trond Myklebust <trond.myklebust@...app.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 17/11/11 12:05, John Hughes wrote:
> On 17/11/11 02:38, Jeff Layton wrote:
>> Note too that the gssd code distinguishes between an expired TGT and a
>> non-existent credcache. The latter will give you the error you desire
>> here. So one possibility is just to remove the credcache from /tmp in
>> this situation.
>
> Something to scan /tmp for expired credentials and zap em?  rpc.gssd 
> would communicate that to the kernel?
>
> Whadaya know, that works.
Here's a dumb perl script that could be run from, for example, .xsession 
to automatically destroy expired ticket caches.

Would need a bit of trickery to make it go away on end of session and 
something in /etc/pm/sleep.d to send it a SIGALRM when the system wakes 
from suspend or hibernate.

It has a potential race between destroying an expired ticket and a new 
ticket being granted.

I guess now I'll look at a hack to rpc.gssd for a neater way of doing this.





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