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

Nico Williams <nico@cryptonector.com> Mon, 06 October 2014 05:06 UTC

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Date: Mon, 06 Oct 2014 00:06:49 -0500
From: Nico Williams <nico@cryptonector.com>
To: Christoph Hellwig <hch@lst.de>
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References: <20141004161750.GA22828@lst.de> <OF88F663C8.C237679D-ON88257D67.006E4B58-88257D67.0070FBCC@us.ibm.com> <20141005072228.GA6312@lst.de>
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Archived-At: http://mailarchive.ietf.org/arch/msg/nfsv4/i-ns_ld3hQqAJxwZv5KAAwzZTW4
Cc: nfsv4@ietf.org
Subject: Re: [nfsv4] xattr model in draft-naik-nfsv4-xattrs-01?
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IMO:

 - for listing attributes the READDIR model should be followed (a
   pageable list+get operation)

 - adding new filesystem-relatedsystem calls and [NFS, ...] protocol
   functionality is a catch-22 kind of deal, and if we always require
   the other to be present first then the one can't ever happen;

   I'm inclined to say that a get/setallxattrs() should be supported,
   BUT:

    - it must be clear that it won't be atomic because it can't be
      atomic

    - because it has to be pageable (and the protocol in general doesn't
      support atomicity in such cases)

Nico
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