You do know that you cannont implement a fully-compliant POSIX FS with only the S3 API?
None of the scalalbe SDS' support random writes. Atomic rename (for building transactional systems like lakehouse table formats) is not there. Listing of files is often eventually consistent.
The closest functional API to a posix-compliant one in scalable SDS' is the HDFS API. Only ADLS supports that. But then again, they are the only one who enable you to fuse mount a directory for local FS read/write access. All of the S3 fuse mount stuff is fundamentally limited by the S3 API.
This is where we learned that! Ceph does it, because separate components are responsible for each of underlying storage, S3 API, and FS API. We tripped on the Seaweed FS and the Garage FS indicia, where "FS" in these contexts typically means File System. But, neither SeaweedFS nor GarageFS is a File System at all; with grace and lenience they could be mildly regarded as Filing Systems, but the reality is that they are actually object stores. SeaweedOS? SeaweedS3?
