block/snapshot: dirty all dirty bitmaps on snapshot-switch
Snapshot-switch actually changes active state of disk so it should reflect on dirty bitmaps. Otherwise next incremental backup using these bitmaps will be invalid. Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 20171023092945.54532-1-vsementsov@virtuozzo.com Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NJohn Snow <jsnow@redhat.com> Signed-off-by: NMax Reitz <mreitz@redhat.com>
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