t.Once.Do(func() {
		t.ttl = ttl
		t.updateFn = update
		t.opts = opts
	})
}

// GetWithCtx will return a cached value or fetch a new one.
// passes a caller context, if caller context cancels nothing
// is cached.
// If the Update function returns an error the value is forwarded as is and not cached.
func (t *Cache[T]) GetWithCtx(ctx context.Context) (T, error) {
	v := t.val.Load()
	ttl := t.ttl
	vTime := t.lastUpdateMs.Load()

	cancel() // cancel context to test.

	_, err := cache.GetWithCtx(ctx)
	if !errors.Is(err, context.Canceled) {
		t.Fatalf("expected context.Canceled err, got %v", err)
	}

	ctx, cancel = context.WithCancel(t.Context())
	defer cancel()

	t1, err := cache.GetWithCtx(ctx)
	if err != nil {
		t.Fatalf("expected nil err, got %v", err)
	}

	t2, err := cache.GetWithCtx(ctx)
	if err != nil {

							// decodeDirObject to avoid any __XLDIR__ objects
							m[prefix] += uint64(usageInfo.Size)
						}
					}
				}
			}
			return m, nil
		},
	)

	return prefixUsageCache.GetWithCtx(ctx)
}

func loadDataUsageFromBackend(ctx context.Context, objAPI ObjectLayer) (DataUsageInfo, error) {
	buf, err := readConfig(ctx, objAPI, dataUsageObjNamePath)
	if err != nil {

			}
			info = *infop
			if info.Error != "" {
				return info, toStorageErr(errors.New(info.Error))
			}
			return info, nil
		},
	)

	return client.diskInfoCache.GetWithCtx(ctx)
}

// MakeVolBulk - create multiple volumes in a bulk operation.
func (client *storageRESTClient) MakeVolBulk(ctx context.Context, volumes ...string) (err error) {
	return errInvalidArgument
}

			}
			for i := range p.apiCalls {
				diskMetric.APICalls[storageMetric(i).String()] = atomic.LoadUint64(&p.apiCalls[i])
			}
			return diskMetric, nil
		},
	)

	diskMetric, _ := p.metricsCache.GetWithCtx(context.Background())
	// Do not need this value to be cached.
	diskMetric.TotalErrorsTimeout = p.totalErrsTimeout.Load()
	diskMetric.TotalErrorsAvailability = p.totalErrsAvailability.Load()

	return diskMetric
}