linux-kernel - Re: [Nbd] [PATCH][V3] nbd: add multi-connection support

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Message-ID: <20161006131630.GA29465@infradead.org>
Date:   Thu, 6 Oct 2016 06:16:30 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Wouter Verhelst <w@...r.be>
Cc:     Christoph Hellwig <hch@...radead.org>,
        "nbd-general@...ts.sourceforge.net" 
        <nbd-general@...ts.sourceforge.net>, Josef Bacik <jbacik@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jens Axboe <axboe@...com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [Nbd] [PATCH][V3] nbd: add multi-connection support

On Thu, Oct 06, 2016 at 03:09:49PM +0200, Wouter Verhelst wrote:
> Okay, I've updated the proto.md file then, to clarify that in the case
> of multiple connections, a client MUST NOT send a flush request until it
> has seen the replies to the write requests that it cares about. That
> should be enough for now.

How do you guarantee that nothing has been reordered or even lost even for
a single connection?