dataUsageCacheName = ".usage-cache.bin"
)

// storeDataUsageInBackend will store all objects sent on the dui channel until closed.
func storeDataUsageInBackend(ctx context.Context, objAPI ObjectLayer, dui <-chan DataUsageInfo) {
	attempts := 1
	for dataUsageInfo := range dui {
		json := jsoniter.ConfigCompatibleWithStandardLibrary
		dataUsageJSON, err := json.Marshal(dataUsageInfo)
		if err != nil {

	TierStats *allTierStats `json:"tierStats,omitempty"`
}

func (dui DataUsageInfo) tierStats() []madmin.TierInfo {
	if dui.TierStats == nil {
		return nil
	}

	if globalTierConfigMgr.Empty() {
		return nil
	}

	ts := make(map[string]madmin.TierStats)
	dui.TierStats.populateStats(ts)

	infos := make([]madmin.TierInfo, 0, len(ts))
	for tier, stats := range ts {

func (sys *BucketQuotaSys) GetBucketUsageInfo(bucket string) (BucketUsageInfo, error) {
	dui, err := bucketStorageCache.Get()
	timedout := OperationTimedOut{}
	if err != nil && !errors.Is(err, context.DeadlineExceeded) && !errors.As(err, &timedout) {
		if len(dui.BucketsUsage) > 0 {

	objAPI, _ := validateAdminReq(ctx, w, r, policy.ListTierAction)
	if objAPI == nil {
		return
	}

	dui, err := loadDataUsageFromBackend(ctx, objAPI)
	if err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	tierStats := dui.tierStats()
	dailyStats := globalNotificationSys.GetLastDayTierStats(ctx)
	tierStats = dailyStats.addToTierInfo(tierStats)

		}
	}
}

// dui converts the flattened version of the path to madmin.DataUsageInfo.
// As a side effect d will be flattened, use a clone if this is not ok.
func (d *dataUsageCache) dui(path string, buckets []BucketInfo) DataUsageInfo {
	e := d.find(path)
	if e == nil {
		// No entry found, return empty.
		return DataUsageInfo{}
	}
	flat := d.flatten(*e)
	dui := DataUsageInfo{

	})

	// Load bucket totals
	cache := dataUsageCache{}
	if err := cache.load(ctx, z.serverPools[poolIdx].sets[setIdx], dataUsageCacheName); err == nil {
		dataUsageInfo := cache.dui(dataUsageRoot, nil)
		tracker.ObjectsTotalCount = dataUsageInfo.ObjectsTotalCount
		tracker.ObjectsTotalSize = dataUsageInfo.ObjectsTotalSize
	}

	tracker.PoolIndex, tracker.SetIndex, tracker.DiskIndex = disk.GetDiskLoc()

		if globalTierConfigMgr.Empty() {
			return
		}

		dui, err := loadDataUsageFromBackend(ctx, objLayer)
		if err != nil {
			metricsLogIf(ctx, err)
			return
		}
		// data usage has not captured any tier stats yet.
		if dui.TierStats == nil {
			return
		}

		return dui.tierMetrics()
	})
	return mg
}

					// Not filled yet.
					return
				}
				allMerged.merge(info)
			}
			if allMerged.root() != nil && allMerged.Info.LastUpdate.After(lastUpdate) {
				updates <- allMerged.dui(allMerged.Info.Name, allBuckets)
				lastUpdate = allMerged.Info.LastUpdate
			}
		}
		for {
			select {
			case <-ctx.Done():
				return
			case v := <-updateCloser:
				update()

		if !ok {
			erasureSet.ID = d.SetIndex
			cache := dataUsageCache{}
			if err := cache.load(ctx, z.serverPools[d.PoolIndex].sets[d.SetIndex], dataUsageCacheName); err == nil {
				dataUsageInfo := cache.dui(dataUsageRoot, nil)
				erasureSet.ObjectsCount = dataUsageInfo.ObjectsTotalCount
				erasureSet.VersionsCount = dataUsageInfo.VersionsTotalCount
				erasureSet.DeleteMarkersCount = dataUsageInfo.DeleteMarkersTotalCount