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Re: [nfsv4] parallel LAYOUTGETs using open stateid

Benny Halevy <bhalevy@panasas.com> Thu, 07 October 2010 13:49 UTC

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From: Benny Halevy <bhalevy@panasas.com>
To: Fred Isaman <iisaman@citi.umich.edu>
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Subject: Re: [nfsv4] parallel LAYOUTGETs using open stateid
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On Thu, Oct 7, 2010 at 9:21 AM, Fred Isaman <iisaman@citi.umich.edu> wrote:
> This question came up as I was going through our layout stateid code.
>
> Can the client send multiple LAYOUTGETs in parallel before getting a
> layoutstateid by using an open stateid?
> If so, what is the server response?  The spec is not clear, but I
> would assume it would do one of:
> a) returning an error (what error?) on all but the first LAYOUTGET it sees
> b) matching the openstateid to the layoutstateid it has already given
> out and sending a reply with that stateid and a bumped seqid

I'm in favour of (b).
Are there any problems you see in that approach?

Benny

> Fred
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