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

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On Tue, 2012-04-17 at 09:32 -0400, Jeff Layton wrote:
> On Tue, 17 Apr 2012 15:12:20 +0200
> Miklos Szeredi <miklos@xxxxxxxxxx> wrote:

> To do that would require protocol support that we simply don't have. We
> don't have a way to (for instance) say via NFS "give me the attributes
> for this filename". Well, at least not for NFSv3...

What's wrong with LOOKUP?

> With v4 you could theoretically construct a compound that does that,
> but you'd have to assume that the server won't release the reference to
> the inode midway through the compound. That's a reasonably safe
> assumption.

Actually, NFSv4 is the one that has the problem: there are no atomicity
guarantees within compounds, so you could theoretically get an ESTALE in
the GETATTR part of our lookup compound.

Trond Myklebust
Linux NFS client maintainer


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