vgoyal added a new comment to an issue you are following:
I think you will have to destroy all images and containers stored in overlay and then
setup devicemapper from that freed space.
Having said that, in theory a path might exist. If overlay2 does not use all free space,
then in theory, one can setup devicemapper in rest of the free space and use atomic
commands to migrate images/containers from overlay2 to devicemapper.
Having said that, migration logic has been racy and less used option.
Shishir wrote support for migration containers from one storage to other.
@dwalsh, you know more about it and how well does it work and should we rely on this
option or not.
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