From: Trond Myklebust <trond.myklebust@fys.uio.no>
Subject: Re: Marking inodes as stale can be wrong
Date: Thu, 29 Apr 2004 20:43:41 -0400
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <1083285820.14910.77.camel@lade.trondhjem.org>
References: <20040429144012.GA15361@suse.de>
	 <1083257096.3686.27.camel@lade.trondhjem.org>
	 <20040429165802.GA18748@suse.de>
	 <1083258570.3686.38.camel@lade.trondhjem.org>
	 <20040429235018.GC4843@sgi.com>
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Cc: Olaf Kirch <okir@suse.de>, nfs@lists.sourceforge.net
To: Greg Banks <gnb@sgi.com>
In-Reply-To: <20040429235018.GC4843@sgi.com>
Errors-To: nfs-admin@lists.sourceforge.net

On Thu, 2004-04-29 at 19:50, Greg Banks wrote:
> > The ERRORS section lists the errors returned for specific types of
> > failures. These lists are not intended to be the definitive statement
> > of all of the errors which can be returned by any specific procedure,
> > but as a guide for the more common errors which may be returned.
> 
> This has been interpreted in discussions here as a loophole that allows
> the server to return any of the defined NFS errors for any of the calls
> at its discretion.

True, and indeed I should have known that.

Note for instance that the error NFS3ERR_JUKEBOX is not listed as a
return value for any of the procedures: I'm sure that it would come as a
surprise to most server implementors if you were to disallow its use
solely on those grounds.

> I don't know why the server returns NFSERR_STALE instead of NFSERR_ACCES,
> but RFC compliance is not a good reason.

Right. It is quite simply a bug...

NFS3ERR_STALE can be returned if the server unexports the filesystem
("revokes access") but here we are talking about a pure credential-based
access check, and so NFS3ERR_ACCES is the correct return value.

Cheers,
  Trond


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