bcachefs — A copy-on-write (COW) file system for Linux first announced by Kent Overstreet in 2015. It is intended to compete with the modern features of ZFS or Btrfs.
LINUX Unplugged 545: 3,062 Days Later — Kent Overstreet, the creator of bcachefs, helps us understand where his new filesystem fits, what it's like to upstream a new filesystem, and how they've solved the RAID write hole.