aye - as it says it provides an FS. The second diagram shows how they chop up files into blocks then store them in the backing object (k/v) storage. A filesys

aye - as it says it provides an FS. The second diagram shows how they chop up files into blocks then store them in the backing object (k/v) storage. A filesystem really is just an index over k/v storage (blocks). You can find similar diagrams for the implementation of EXT/XFS/GFS/HDFS etc. Like databases there are many tradeoffs and nuances in terms of how these concepts are implemented.