linux-kernel - Re: [PATCH RFC] vfs: make fstatat retry on ESTALE errors from getattr call

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Date:	Tue, 17 Apr 2012 11:45:49 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	"Myklebust, Trond" <Trond.Myklebust@...app.com>,
	Miklos Szeredi <miklos@...redi.hu>,
	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>,
	Malahal Naineni <malahal@...ibm.com>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"pstaubach@...grid.com" <pstaubach@...grid.com>,
	"viro@...IV.linux.org.uk" <viro@...IV.linux.org.uk>,
	"hch@...radead.org" <hch@...radead.org>,
	"michael.brantley@...haw.com" <michael.brantley@...haw.com>,
	"sven.breuner@...m.fraunhofer.de" <sven.breuner@...m.fraunhofer.de>
Subject: Re: [PATCH RFC] vfs: make fstatat retry on ESTALE errors from
 getattr call

On Tue, Apr 17, 2012 at 10:20:35AM -0400, Jeff Layton wrote:
> Well, it's possible, but it seems pathological to me for a server to do
> that...
> 
> Bruce and I were discussing this the other day. It would be good to add
> something like this to the RFCs:
> 
> "On a PUTFH, a server SHOULD hold a reference to the filehandle such

For "filehandle" I'd specify "current and saved filehandle".

> that it does not go stale over the life of the compound."

And that's *much* less of a burden on the server than requiring that the
compound execute atomically.

> ...or something along those lines. That's a different matter though and
> not directly related to this. :)

Yes.

--b.
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