From: Wolfgang Bumiller <w.bumiller@proxmox.com>
Date: Wed, 9 Dec 2015 15:41:13 +0100
Subject: [PATCH 21/47] backup: do not use bdrv_drain_all
From: Wolfgang Bumiller <w.bumiller@proxmox.com>
Date: Wed, 9 Dec 2015 15:41:13 +0100
Subject: [PATCH 21/47] backup: do not use bdrv_drain_all