cinder/releasenotes/notes/fix-reimage-sparse-copy-d34...

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fixes:
- |
`Bug #2045431 <https://bugs.launchpad.net/cinder/+bug/2045431>`_: Fixed
a data leak scenario where we preserve sparseness when reimaging the
volume.
We currently do a sparse copy when writing an image on the volume. This
could be a potential data leak scenario where the zero blocks of the new
image are not written on the existing volume and the data from the old
image still exists on the volume. We fix the scenario by not doing sparse
copy when reimaging the volume.