qcow2-bitmap: add qcow2_reopen_bitmaps_rw_hint()
Add version of qcow2_reopen_bitmaps_rw, which do the same work but also return a hint about was header updated or not. This will be used in the following fix for bitmaps reloading after migration. Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: NJohn Snow <jsnow@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Message-id: 20180320170521.32152-2-vsementsov@virtuozzo.com Signed-off-by: NMax Reitz <mreitz@redhat.com>
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