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Date:   Tue, 7 Jan 2020 11:15:36 -0500
To:     NeilBrown <neilb@suse.de>
Cc:     Trond Myklebust <trondmy@hammerspace.com>,
        "anna.schumaker@netapp.com" <anna.schumaker@netapp.com>,
        "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>
Subject: Re: [PATCH/RFC] NFS: handle NFSv4.1 server that doesn't support
 NFS4_OPEN_CLAIM_DELEG_CUR_FH
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From:   bfields@fieldses.org (J. Bruce Fields)
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On Fri, Dec 20, 2019 at 04:19:56PM +1100, NeilBrown wrote:
> I was a bit surprised that nfs4_map_atomic_open_claim() exists at all,
> but given that it did, I assumed it would be used more uniformly.
> 
> So this all implies that Linux NFS server claimed to support NFSv4.1
> before it actually did - which seems odd.  This is just a bug (which are
> expected), but a clear ommission.

For what it's worth, I did make some attempt to keep 4.1 by default
until 3.11 (see d109148111cd "nfsd4: support minorversion 1 by default")
but probably could have communicated that better.  This isn't the only
blatant known issue in older code.

--b.