From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:54140)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <rudyflyzhang@gmail.com>) id 1aNbgJ-0000s0-Ov
	for qemu-devel@nongnu.org; Mon, 25 Jan 2016 02:35:24 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <rudyflyzhang@gmail.com>) id 1aNbgJ-0001sa-0k
	for qemu-devel@nongnu.org; Mon, 25 Jan 2016 02:35:23 -0500
From: Rudy Zhang <rudyflyzhang@gmail.com>
Message-ID: <56A5D031.4030409@gmail.com>
Date: Mon, 25 Jan 2016 15:35:13 +0800
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Subject: [Qemu-devel] [Questions] Several questions about incremental backup
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: qemu-devel@nongnu.org, qemu-block@nongnu.org, Fam Zheng <famz@redhat.com>, John Snow <jsnow@redhat.com>

I am reading and testing the function: incremental backup in qemu-2.5.
But I have serveral questions about it.
1. If I want to start image backup, at first I need to start full mode backup
   and then, add a bitmap to trace io, next start incremental backup via the
   bitmap before we added. But when the first incremental backup over, it will
   abdicate the bitmap. How can I start the second incremental backup without
   the bitmap to trace io? I don't know why abdicate the bitmap.
   Is it only an incremental backup?
2. When abdicating the bitmap, it seems leak memory about bitmap->successor.