Re: [Devel] [PATCH 2/6] nfsd: swap fs root in NFSd kthreads

[Stanislav Kinsbursky]

11.12.2012 19:35, J. Bruce Fields ÐÐÑÐÑ:
> On Tue, Dec 11, 2012 at 10:20:36AM -0500, J. Bruce Fields wrote:
> > On Tue, Dec 11, 2012 at 07:07:00PM +0400, Stanislav Kinsbursky wrote:
> > > I don't really understand, how  mountd's root can be wrong. I.e.
> > > its' always right as I see it. NFSd kthreads have to swap/use
> > > relative path/whatever to communicate with proper mountd.
> > > Or I'm missing something?
> >
> > Ugh, I see the problem: I thought svc_export_request was called at the
> > time mountd does the read, but instead its done at the time nfsd does
> > the upcall.
> >
> > I suspect that's wrong, and we really want this done in the context of
> > the mountd process when it does the read call.  If d_path is called
> > there then we have no problem.
>
> Right, so I'd be happier if we could modify sunrpc_cache_pipe_upcall to
> skip calling cache_request and instead delay that until cache_read().  I
> think that should be possible.

Hmmm...
I'm not familiar with mountd to kernel exchange protocol.
It looks like kernel passes that path string to mountd on upcall.

> --b.


--
Best regards,
Stanislav Kinsbursky
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