There's some ZFS whitepapers that explain the data structures in a code-free way ;) Not to mention the GRUB driver. It's GPLv3 but I wouldn't be surprised if t

There's some ZFS whitepapers that explain the data structures in a code-free way ;) Not to mention the GRUB driver. It's GPLv3 but I wouldn't be surprised if the GRUB project is willing to relicense it for a Linux kernel port.