kubernetes/pkg/controller/volume/common/common.go

const PodPVCIndex …

// PodPVCIndexFunc creates an index function that returns PVC keys (=
// namespace/name) for given pod.  This includes the PVCs
// that might be created for generic ephemeral volumes.
func PodPVCIndexFunc() func(obj interface{ … }

// AddPodPVCIndexerIfNotPresent adds the PodPVCIndexFunc.
func AddPodPVCIndexerIfNotPresent(indexer cache.Indexer) error { … }

// AddIndexerIfNotPresent adds the index function with the name into the cache indexer if not present
func AddIndexerIfNotPresent(indexer cache.Indexer, indexName string, indexFunc cache.IndexFunc) error { … }