rbd: factor out get_parent_info()
In preparation for the new parent_get and parent_overlap_get class methods, factor out the fetching and decoding of parent data. As a side effect, we now decode all four fields in the "no parent" case. Signed-off-by: NIlya Dryomov <idryomov@gmail.com> Reviewed-by: NJason Dillaman <dillaman@redhat.com>
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