I know Bcachefs is nearing its big merge into mainline Linux, but I wonder if the current state of Rust support in the kernel would allow for something like Bcachefs to be written. I know I can write a driver in Rust, but could I write a filesystem in Rust?

> Currently, puzzlefs is implemented as a userspace filesystem (FUSE). A read-only kernel filesystem driver is underway.

Ahh interesting. I hadn't heard of PuzzleFS, but it sounds like they are anticipating Rust support will become good enough. Neat!

I read a lot of the emails from the past few months (see also https://news.ycombinator.com/item?id=37660709) and I think it will get in by the end of the year. Also think things will go better after that.

Good luck, Kent!