Re: [PATCH RFC v2 0/5] block: add block-dirty-bitmap-populate job

[Peter Krempa]

On Mon, May 18, 2020 at 16:52:45 +0200, Peter Krempa wrote:
> On Wed, May 13, 2020 at 23:49:17 -0400, John Snow wrote:
> > Hi,
> > 
> > This is a new (very small) block job that writes a pattern into a
> > bitmap. The only pattern implemented is the top allocation information.
> > 
> > This can be used to "recover" an incremental bitmap chain if an external
> > snapshot was taken without creating a new bitmap first: any writes made
> > to the image will be reflected by the allocation status and can be
> > written back into a bitmap.
> > 
> > This is useful for e.g. libvirt managing backup chains if a user creates
> > an external snapshot outside of libvirt.
> 
> I've dusted-off my patches for using this blockjob for this very
> specific case and it works for me.
> 
> Tested-by: Peter Krempa <pkrempa@redhat.com>
> 
> For now I'll continue the integration with other blockjobs where we
> merge bitmaps.

I've posted the libvirt patches which make use of this blockjob as RFC
on the libvir-list:

https://www.redhat.com/archives/libvir-list/2020-June/msg00292.html

I also have a branch with the patchset rebased to master (except for one
of the test commits IIRC) linked from the cover-letter.