[$] Bringing bcachefs to the mainline

Bcachefs is a longstanding out-of-treefilesystem that grew out of the bcache cachinglayer that has been in the kernel for nearly ten years. Based on asession led by Kent Overstreet at the2022 Linux Storage,Filesystem, Memory-management and BPF Summit (LSFMM), though, it wouldseem that bcachefs is likely to be heading upstream soon. He intends tostart the process toward mainline inclusion over the next six months or so.