Internal
OverlayFS makes a read-only filesystem writable by storing writes on a second, writable file system. Deletes are persisted via metadata stored on the writable file system.
Optional
Protected
Whether the sync cache should be disabled. Only affects async things.
Readonly
Called once to load up metadata stored on the writable file system.
Test whether or not the given path exists.
OverlayFS makes a read-only filesystem writable by storing writes on a second, writable file system. Deletes are persisted via metadata stored on the writable file system.