BitSyncing
return state == BitSyncing || state == BitSyncingUnwritten;
bits[BitNeedSync], bits[BitSyncing],
[BitmapActionStartsync] = BitSyncing,
[BitSyncing] = {
[BitmapActionStartsync] = BitSyncing,
[BitmapActionStartwrite] = BitSyncing,
state = BitSyncing;