EROFS as the new read-only file-system for Linux has seen many interesting changes. EROFS now supports LZMA (MicroLZMA) compression , multiple device support is introduced for multi-layer container images, secondary compression head support, and other improvements. There is also the usual assortment of bug fixes.
More details on the EROFS changes via this pull request .
The XFS changes this cycle include a number of bug fixes as well as work to lower the file-system's memory footprint. Some of the fixes include fixing a corruption warning, slab cache misuse, and other bugs. There is also prep work towards being able to support larger B-Trees with XFS in the future.
AFS meanwhile has seen fixes in the road toward making use of memory folio support.
The Linux 5.16 merge window remains quite busy with a lot going on.