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Especially outside of transactions, it is helpful to provide all-or-nothing semantics for bitmap merges. This facilitates the coalescing of multiple bitmaps into a single target for the "checkpoint" interpretation when assembling bitmaps that represent arbitrary points in time from component bitmaps. This is an incompatible change from the preliminary version of the API. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20181221093529.23855-4-jsnow@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>