I'm really excited for this. If it lives up to the hype I think it could become the defacto filesystem some day.
BTRFS, despite being a great filesystem, got a bad rep mostly due to its poor RAID5/6 implementation. It also lags behind in performance in many configurations and has been mostly relagated to a specialty filesystem. While it could make a great root filesystem few distros have adopted it as such.
ZFS has been similarly pigeon holed. It's typically only used for building large arrays because it's not very safe when used on a single device (edit: After some research this may not be true and is probably outdated or incorrect info stuck in my head) . It also lacks a lot of the flexibility of BTRFS, though you could say it trades flexibility for reliability.
bcachesfs on the other hand feels like it has the potential to be adopted as a root file system while also providing replication, erasure coding, high performance and snapshots; something that no filesystem has managed to date, at least on a wide scale.
Honestly this is probably me going off of outdated or even incorrect information. The fact that it has little adoption for that use case or as a root filesystem is probably the larger factor.
It's been awesome to see Ubuntu embrace it over the last few releases though and that's certainly starting to change things but since it's not part of the Linux kernel that gives most other distros pause I think.
I don't believe it's been marked stable yet but it doesn't suffer from the raid write hole like BTRFS and claims to be more performant than ZFS's implementation.
With it being merged into the kernel it should get much wider use and hopefully that helps it reach stability.
Yeah. I only use it in Fedora because it was one of or the default partition scheme or the recommended one, can't remember. But I'm impressed with it, actually. Enough to make me try to learn the basics, in case I have to install another distro.
Fedora adopted it as default with Fedora 33. SUSE has been using it as default for many years now. Facebook is one of the largest users and contributors to btrfs. It's a solid filesystem when it's not used to do things it warns you not to do.
I’m a happy btrfs user, but it’s most definitely a great thing to see what seems like a really clean implementation like this that is able to learn from the many years of collective experience with ZFS and btrfs.
Built-in encryption in bcachefs sounds great, that's the only thing that BTRFS has been missing for me so far.
Bonus points if it can be decrypted on boot like LUKS, and double bonus points if its scriptable like cryptsetup (retrieve key from hardware device, or network, or flash stick etc)