[sheepdog] [PATCH 1/2] collie: add command 'collie vdi rollback'

[MORITA Kazutaka]

At Fri, 31 Aug 2012 04:50:41 +0000,
Dietmar Maurer wrote:
> 
> > > Why rollback create another vdi? I thought of rollback in place
> > > instead of creating another VDI object too.
> > 
> > If we don't delete newer snapshots than the rollbacked one (this behavior is
> > same as VMware and VirtualBox), adding a child vdi to the snapshot looks
> > the easiest way to implement the operation.
> 
> Yes, but you can still delete the actual vdi, because that is no longer needed?

Yes, it is unnecessary.  If we add a new child vdi to the rollback
snapshot, the previous state becomes a new snapshot automatically.
Perhaps collie should delete it after we safely rollback to the
snapshot.

Thanks,

Kazutaka