kubernetes/pkg/volume/metrics_block.go

var _ …

type metricsBlock …

// NewMetricsStatfs creates a new metricsBlock with the device node of the
// Volume.
func NewMetricsBlock(device string) MetricsProvider { … }

// See MetricsProvider.GetMetrics
// GetMetrics detects the size of the BlockMode volume for the device node
// where the Volume is attached.
//
// Note that only the capacity of the device can be detected with standard
// tools. Storage systems may have more information that they can provide by
// going through specialized APIs.
func (mb *metricsBlock) GetMetrics() (*Metrics, error) { … }

// getBlockInfo fetches metrics.Capacity by opening the device and seeking to
// the end.
func (mb *metricsBlock) getBlockInfo(metrics *Metrics) error { … }