vgoyal added a new comment to an issue you are following:
What I'm hearing is the "flip back to devicemapper without
repartitioning" path doesn't actually exist.
Flipping back to devicemapper will require free space. And that would be possible only if
ext4 and xfs had online shrink support. That way one could have shrunk rootfs and made
space for devicemapper consumtion.
Xfs does not support shrinking and ext4 supports only offline shrinking. So this option
does not work.
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