linux-kernel - Re: [PATCH 0/3] iopmem : A block device for PCIe memory

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Message-ID: <20161027123219.GA757@infradead.org>
Date:   Thu, 27 Oct 2016 05:32:19 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Sagi Grimberg <sagi@...mberg.me>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Dave Chinner <david@...morbit.com>,
        jgunthorpe@...idianresearch.com, sbates@...thin.com,
        "Raj, Ashok" <ashok.raj@...el.com>, haggaie@...lanox.com,
        linux-rdma@...r.kernel.org,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...1.01.org>,
        Jonathan Corbet <corbet@....net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        jim.macdonald@...rspin.com, Stephen Bates <sbates@...thlin.com>,
        linux-block@...r.kernel.org, Linux MM <linux-mm@...ck.org>,
        Jens Axboe <axboe@...com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 0/3] iopmem : A block device for PCIe memory

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.