This is only part of the zfs on linux port, not part of the kernel proper (i.e. mainline). The kernel team is responsible for their part. and the zfs on linux

This is only part of the zfs on linux port, not part of the kernel proper (i.e. mainline). The kernel team is responsible for their part. and the zfs on linux team, since they have to import their own, due to licensing concerns must maintain the library they ship.