On Thu, Dec 12, 2013 at 04:23:36PM +0800, Fam Zheng wrote: > This series adds for point-in-time snapshot NBD exporting based on > blockdev-backup (variant of drive-backup with existing device as target). > > We get a thin point-in-time snapshot by COW mechanism of drive-backup, and > export it through built in NBD server. The steps are as below: > > 1. (SHELL) qemu-img create -f qcow2 BACKUP.qcow2 <source size here> > > (Alternatively we can use -o backing_file=RUNNING-VM.img to omit > explicitly > providing the size by ourselves, but it's risky because RUNNING-VM.qcow2 > is > used r/w by guest. Whether or not setting backing file in the image file > doesn't matter, as we are going to override the backing hd in the next > step) > > 2. (QMP) blockdev-add backing=source-drive file.driver=file > file.filename=BACKUP.qcow2 id=target0 if=none driver=qcow2 > > (where source-drive is the running BlockDriverState name for > RUNNING-VM.img. This patch implements "backing=" option to override > backing_hd for added drive) > > 3. (QMP) blockdev-backup device=source-drive sync=none target=target0 > > (this is the QMP command introduced by this series, which use a named > device as target of drive-backup) > > 4. (QMP) nbd-server-add device=target0 > > When image fleecing done: > > 1. (QMP) block-job-complete device=source-drive
If you do another revision, this should be block-job-cancel. Ian