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Date: Mon, 28 Oct 2013 14:08:38 -0400
From: Dr Fields James Bruce <bfields@fieldses.org>
To: Ric Wheeler <rwheeler@redhat.com>
Cc: "Myklebust, Trond" <Trond.Myklebust@netapp.com>,
        Christoph Anton Mitterer <calestyo@scientia.net>,
        Mailing List Linux NFS <linux-nfs@vger.kernel.org>,
        Steve Dickson <SteveD@redhat.com>
Subject: Re: XATTRs in NFS?
Message-ID: <20131028180838.GG31322@fieldses.org>
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On Mon, Oct 28, 2013 at 02:00:58PM -0400, Ric Wheeler wrote:
> On 10/28/2013 01:49 PM, Myklebust, Trond wrote:
> >On Oct 28, 2013, at 12:15 PM, Christoph Anton Mitterer <calestyo@scientia.net> wrote:
> >
> >>On Mon, 2013-10-28 at 11:40 -0400, Ric Wheeler wrote:
> >>>Then you end up with large directories and an extra name per inode that needs to
> >>>be stored and extra lookups for each file when you do a whole file system crawl.
> >>>
> >>>Certainly not as easy as adding and xattrs with that information :)
> >>And I think there's another reason why it wouldn't work...
> >>
> >>Imagine I change my system to encode what should be XATTRs in hardlink
> >>pseudo files...
> >>
> >>If I have such pair locally e.g. on my ext4:
> >>/foo/bar/actual/file
> >>/meta/<SHA512 identifier>.2342348324
> >>
> >>And now move/copy the file via the network to the archive, I'd have to
> >>copy both files (which is really annoying), and I'd guess the inode
> >>coupling would get los (and at least the name wouldn't fit anymore).
> >>
> >>So the whole thing is IMHO not even a workaround.
> >OK. So you're going to do XATTRs for us?
> >
> >Trond
> 
> Now that pNFS is perfect and labeled NFS has made it upstream, I
> think that Steve D must be looking for something to keep him busy :)

I agree with Trond that we first really need good evidence about exactly
who wants this and why.

--b.