[ANNOUNCE] bcachefs – a general purpose COW filesystem

For those who haven't kept up with bcache, the bcache codebase has beenevolving/metastasizing into a full blown, general purpose posix filesystem - amodern COW filesystem with checksumming, compression, multiple devices, caching,and eventually snapshots and all kinds of other nifty features."Yet another new filesystem? Why?"Well, years ago (going back to when I was still at Google), I and the otherpeople working on bcache realized that what we were working on was, almost byaccident, a good chunk of the functionality of a full blown filesystem - andthere was a really clean and elegant design to be had there if we took it andran with it. And a fast one - the main goal of bcachefs to match ext4 and xfs onperformance and reliability, but with the features of btrfs/zfs.It's taken a long time to get to this point - longer than I would have guessedif you'd asked me back when we first started talking about it - but I'm prettydamn proud of where it's at now.