Re: [PATCH 6/6] kbase: incrementalbackupinternals: Describe 'block commit'

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On Wed, Jun 24, 2020 at 09:35:22 -0500, Eric Blake wrote:
> On 6/24/20 9:07 AM, Peter Krempa wrote:
> > oVirt does merge images out of libvirt in some cases. Add docs outlining
> > how it's done from a high level.
> > 
> > Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
> > ---
> >   docs/kbase/incrementalbackupinternals.rst | 37 +++++++++++++++++++++++
> >   1 file changed, 37 insertions(+)
> > 
> > diff --git a/docs/kbase/incrementalbackupinternals.rst b/docs/kbase/incrementalbackupinternals.rst
> > index 9a96ef6df3..e50bf52e89 100644
> > --- a/docs/kbase/incrementalbackupinternals.rst
> > +++ b/docs/kbase/incrementalbackupinternals.rst
> > @@ -245,3 +245,40 @@ the snapshot.
> >               continue
> > 
> >           create RECORDING bitmap named BITMAP in OVERLAY with GRANULARITY
> > +
> > +Commiting external snapshots manually
> 
> Committing
> 
> > +-------------------------------------
> > +
> > +``block commit`` refers to an operation where data from a subchain of the
> > +backing chain is merged down into the backing image of the subchain removing all
> > +images in the subchain .
> 
> Drop space before .
> 
> Does oVirt care about block pull, or only block commit?  But block pull can
> be a separate patch if we need more information; this one is useful as-is
> (well, with typos fixed).

oVirt doesn't use block pull for now and even libvirt doesn't implement
bitmap handling for the pull job for now. I'll add information here once
I do the implementation.




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