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Date: Wed, 22 Oct 2014 13:48:44 -0700
From: Robert White <rwhite@pobox.com>
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To: Hugo Mills <hugo@carfax.org.uk>, Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: NOCOW and Swap Files?
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On 10/22/2014 01:42 PM, Hugo Mills wrote:
>     swap-on-NFS is still, I think, in a set of out of tree patches, and
> it's not gone anywhere near btrfs yet. It's just that once it does
> land in mainline, it would form the appropriate infrastructure to
> develop swapfile capability for btrfs.

I just looked at my 3.16.6 kernel tree and there is a check-box for swap 
over NFS in the network file systems menu. For whatever that's worth.

But as of now only the loopdev method is workable if I understand you 
correctly.

Thanks.

--Rob.