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