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Date: Thu, 27 Oct 2016 05:32:19 -0700
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 0/3] iopmem : A block device for PCIe memory
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To: Sagi Grimberg <sagi@grimberg.me>
Cc: jgunthorpe@obsidianresearch.com, sbates@raithin.com, "Raj, Ashok  <ashok.raj@intel.com>, haggaie@mellanox.com, linux-rdma@vger.kernel.org, linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>, Jonathan Corbet <corbet@lwn.net>, Dave Chinner <david@fromorbit.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, jim.macdonald@everspin.com, Stephen Bates <sbates@raithlin.com>, Christoph Hellwig <hch@infradead.org>, Linux MM <linux-mm@kvack.org>, linux-block@vger.kernel.org, Jens Axboe <axboe@fb.com>, David Woodhouse <dwmw2@infradead.org>
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On Thu, Oct 27, 2016 at 01:22:49PM +0300, Sagi Grimberg wrote:
> Christoph, did you manage to leap to the future and solve the
> RDMA persistency hole? :)
> 
> e.g. what happens with O_DSYNC in this model? Or you did
> a message exchange for commits?

Yes, pNFS calls this the layoutcommit.  That being said once we get a RDMA
commit or flush operation we could easily make the layoutcommit optional
for some operations.  There already is a precedence for the in the
flexfiles layout specification.
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