From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:34647)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <berto@igalia.com>) id 1aPFTo-0001Zx-Ei
	for qemu-devel@nongnu.org; Fri, 29 Jan 2016 15:17:17 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <berto@igalia.com>) id 1aPFTl-0004sX-4V
	for qemu-devel@nongnu.org; Fri, 29 Jan 2016 15:17:16 -0500
Date: Fri, 29 Jan 2016 22:16:15 +0200
From: Alberto Garcia <berto@igalia.com>
Message-ID: <20160129201615.GA18614@perseus.local>
References: <CCBF57B7-04B8-47E9-8786-DB7DE786969B@alex.org.uk>
	<56A92CC5.9070403@redhat.com>
	<AD328CF0-9F95-4C64-84F1-32DCF1413A0F@alex.org.uk>
	<56AA32DE.80005@redhat.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <56AA32DE.80005@redhat.com>
Subject: Re: [Qemu-devel] QCOW rebases on running VMs
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Eric Blake <eblake@redhat.com>
Cc: qemu block <qemu-block@nongnu.org>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Alex Bligh <alex@alex.org.uk>

On Thu, Jan 28, 2016 at 08:25:18AM -0700, Eric Blake wrote:

> > Sadly what I need is block-stream to an intermediate layer (as I
> > want to merge in the other direction); I don't think that proposal
> > was ever implemented.
> > 
> > http://wiki.qemu.org/Features/Snapshots#Streaming_to_an_Intermediate_Layer_.5Bproposal.5D
> 
> Alberto was working on it last; this was the most recent mail I found on
> the topic (just to the qemu-block list):
> https://lists.gnu.org/archive/html/qemu-block/2015-12/msg00214.html
> 
> so although I recall some RFC patches having been posted, you are
> right that it still needs some work to be merged in.

The intermediate block streaming code was finished and ready to be
merged about half a year ago. Unfortunately there were conflicts with
other changes that were happening at the same time so it had to be
rolled back.

Here's the latest version of the series:

   https://lists.gnu.org/archive/html/qemu-devel/2015-06/msg05754.html

And here's a recent summary of the problems that prevent it from being
merged:

   https://lists.gnu.org/archive/html/qemu-block/2015-12/msg00180.html

My plan is to continue working on it.

Berto