Inject writeback results into PFC's cache #91
Description
As a follow-up to #81, we should investigate how we could inject the writeback results into the PFC cache itself.
We'll need to know:
- That the client is embedded in a PFC (I think this is available via Unix env var?)
- The configuration of the PFC so we can select a final destination. Worst case, we can require this to be hardcoded a second time (making more work for the user).
- A way to notify the PFC a file has been added, correcting the usage statistics. This likely requires an upstream change.