Wrong filesystem. bcache is the one that sits in front of another filesystem, and improves its performance. bcachefs (your link) is from the same author, but

Wrong filesystem. bcache is the one that sits in front of another filesystem, and improves its performance. bcachefs (your link) is from the same author, but is a standalone filesystem. https://en.wikipedia.org/wiki/Bcache https://en.wikipedia.org/wiki/Bcache