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Re: [nfsv4] 4.0 trunking

"J. Bruce Fields" <bfields@fieldses.org> Wed, 21 September 2016 19:53 UTC

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Date: Wed, 21 Sep 2016 15:53:39 -0400
From: "J. Bruce Fields" <bfields@fieldses.org>
To: David Noveck <davenoveck@gmail.com>
Message-ID: <20160921195339.GC24084@fieldses.org>
References: <CADaq8jfiRU7DTRYXGHZvMALAZWeRjhqcpo8Si3_diMt_5dNSMw@mail.gmail.com> <20160908010532.GA10658@fieldses.org> <CADaq8jcnananUPDHH4Vzhv93JTxZegsZLMCtZWFD-keHheKvHA@mail.gmail.com> <20160910200355.GA30688@fieldses.org> <BBB2EBDC-6F05-44C1-B45A-C84C24A9AD7F@netapp.com> <20160920213931.GC12789@fieldses.org> <CADaq8jeqr9WPeBeV0ruxwy+5omfgHhJFjAR=tCGL3N-Yjt0PuQ@mail.gmail.com> <20160921024531.GA17232@fieldses.org> <CADaq8jdUJG7zBwn7f2xtLO3gf4nvwjM2H00E6N2oTGP2b9Nzww@mail.gmail.com> <20160921141409.GA20963@fieldses.org>
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Subject: Re: [nfsv4] 4.0 trunking
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On Wed, Sep 21, 2016 at 10:14:09AM -0400, J. Bruce Fields wrote:
> On Wed, Sep 21, 2016 at 05:09:59AM -0400, David Noveck wrote:
> > I think that works.  I'm going to look at how to update section 5.8 of
> > RFC7931.
> 
> Great, let me know when there's something to review.
> 
> The Linux client looks like it's actually doing something even simpler,
> basically:
> 
> 	1. a SETCLIENTID to IP address X1 returns a clientid.  You
> 	confirm it and carry on.
> 
> 	2.  Some time later a SETCLIENTID to IP address X2 returns the
> 	same clientid, and verifier V2.  To check whether X1 and X2
> 	actually point to the same server:
> 
> 	3. Confirm that SETCLIENTID with SETCLIENTID_CONFIRM(client, V2)
> 	sent to X1.
> 
> And I don't see how to shoehorn this extra check in there, so I think it
> needs to add in the extra callback-changing SETCLIENTID to X1.

Oh, now that I look at it I think it's really easy.  All we have to do
is check that the verifier has changed since step 1.  If it has,
continue to step 3, if it hasn't, they're different servers.

--b.

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