Package cache implements data structures used by the kubelet volume manager to keep track of attached volumes and the pods that mounted them.

Package populator implements interfaces that monitor and keep the states of the caches in sync with the "ground truth".

Package reconciler implements interfaces that attempt to reconcile the desired state of the with the actual state of the world by triggering relevant actions (attach, detach, mount, unmount).

NewVolumeManager returns a new concrete instance implementing the VolumeManager interface.

VolumeManager runs a set of asynchronous loops that figure out which volumes need to be attached/mounted/unmounted/detached based on the pods scheduled on this node and makes it so.