The bcachefs filesystem

Kent Overstreet, author of the bcacheblock caching layer, has announced that bcachehas metamorphosed into a fully featured copy-on-write filesystem."Well, years ago (going back to when I was still at Google), I andthe other people working on bcache realized that what we were working onwas, almost by accident, a good chunk of the functionality of a full blownfilesystem - and there was a really clean and elegant design to be hadthere if we took it and ran with it. And a fast one - the main goal ofbcachefs to match ext4 and xfs on performance and reliability, but with thefeatures of btrfs/zfs."