linux-kernel - Re: [Nbd] [RESEND][PATCH 0/5] nbd improvements

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Date:   Thu, 15 Sep 2016 04:40:05 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Wouter Verhelst <w@...r.be>
Cc:     Alex Bligh <alex@...x.org.uk>, Josef Bacik <jbacik@...com>,
        "nbd-general@...ts.sourceforge.net" 
        <nbd-general@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-block@...r.kernel.org, Markus Pargmann <mpa@...gutronix.de>,
        kernel-team@...com
Subject: Re: [Nbd] [RESEND][PATCH 0/5] nbd improvements

On Thu, Sep 15, 2016 at 01:29:36PM +0200, Wouter Verhelst wrote:
> Yes, and that is why I was asking about this. If the write barriers
> are expected to be shared across connections, we have a problem. If,
> however, they are not, then it doesn't matter that the commands may be
> processed out of order.

There is no such thing as a write barrier in the Linux kernel.  We'd
much prefer protocols not to introduce any pointless synchronization
if we can avoid it.