Btrfs Automatic Grow Feature
This feature will improve the behavior of homed's auto-resize mode. Basically, btrfs should be able to automatically grow to fill its block device as more space is needed.
For instance: let's say we make a 1 GB Btrfs filesystem on a 10 GB disk partition. If the user tries to write 5 GB of data to their filesystem (and this functionality is turned on), then the filesystem can grow itself to 5 GB in size.
The Btrfs maintainers have expressed interest in this feature, and it would be useful for containers as well.
This is out-of-scope for the STF grant, but would improve the homed experience. Help would be appreciated