qcow2: fix bitmaps loading when bitmaps already exist
On reopen with existing bitmaps, instead of loading bitmaps, lets reopen them if needed. This also fixes bitmaps migration through shared storage. Consider the case. Persistent bitmaps are stored on bdrv_inactivate. Then, on destination process_incoming_migration_bh() calls bdrv_invalidate_cache_all() which leads to qcow2_load_autoloading_dirty_bitmaps() which fails if bitmaps are already loaded on destination start. Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 20180320170521.32152-3-vsementsov@virtuozzo.com Signed-off-by: NMax Reitz <mreitz@redhat.com>
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