On Tue, Mar 01, 2011 at 02:11:32PM -0600, Steve French wrote:
> I vaguely remember that the same problem can occur with nfsd on a
> local file system

Not true; as I've said, exportable local filesystems know how to look up
a file on disk by filehandle.

> and that nfs clients have to be able to recover from
> ESTALE (e.g. lookup/delete/create/lookup would fail with ESTALE
> otherwise).

It is true, however, that there are some *other* cases when a server can
return ESTALE.  In those cases (such as the one Peter Staubach discusses
in more detail at http://lwn.net/Articles/272684/) there may be some
recovery that a client might reasonably attempt.

Alas, no client can be expected to recover from ESTALE errors on an
opened file--those will just be passed on to the application.

--b.
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