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Re: [nfsv4] xattr model in draft-naik-nfsv4-xattrs-01?

Nico Williams <nico@cryptonector.com> Mon, 06 October 2014 21:22 UTC

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Date: Mon, 06 Oct 2014 16:22:44 -0500
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From: Nico Williams <nico@cryptonector.com>
To: Manoj Naik <mnaik@us.ibm.com>
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Cc: NFSv4 <nfsv4@ietf.org>, Christoph Hellwig <hch@lst.de>
Subject: Re: [nfsv4] xattr model in draft-naik-nfsv4-xattrs-01?
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On Oct 6, 2014 4:16 PM, "Manoj Naik" <mnaik@us.ibm.com> wrote:
>
> Nico Williams <nico@cryptonector.com> wrote on 10/05/2014 10:06:49 PM:
>
> > From: Nico Williams <nico@cryptonector.com>
> > To: Christoph Hellwig <hch@lst.de>
> > Cc: Manoj Naik/Almaden/IBM@IBMUS, nfsv4@ietf.org
> > Date: 10/05/2014 10:06 PM
>
> > Subject: Re: [nfsv4] xattr model in draft-naik-nfsv4-xattrs-01?
> >
> >
> > IMO:
> >
> >  - for listing attributes the READDIR model should be followed (a
> >    pageable list+get operation)
>
>
> OK, we've been trying to avoid this at least for the first couple of
draft revisions. The current draft (Section 5.2.1) states:
>
>                       In addition, the total size of xattrs exchanged
>    between the client and server for get/set operations is limited by
>    the channel's negotiated maximum size for requests and responses.
>
> Granted, we probably need to revisit this. Requiring a single xattr
get/set to fit in a single COMPOUND makes the specification much simpler.
(This also seems to be the implicit requirement for other file attributes
like ACLs). Perhaps we can (should?) allow list/getall/setall to follow the
READDIR model.

Yes, but the implementation also had to be simple.  And feasible.  IMO you
cannot avoid a paging requirement.

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