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Re:Show HN: ZFS Implementation in Python by CaliforniaKarl on Saturday May 04, 2019 @01:29PM (#19827867)
You'd want a reverse-engineering lawyer, so be certain. But my (IANAL) guess is: If this is a proper reverse-engineered implementation, you could then convert _this_ implementation to C, and contribute _that_ into the kernel.

Except, it seems this is BSD-licensed, so I'm not sure how that would work in the kernel (which is GPLv2).

Re:Show HN: ZFS Implementation in Python by loeg on Saturday May 04, 2019 @02:15PM (#19828178)
BSDL code is fine in the GPLv2 kernel. E.g., most of the DRM drivers are dual BSD-GPL licensed.
Re:Show HN: ZFS Implementation in Python by lunixbochs on Saturday May 04, 2019 @02:11PM (#19828146)
BSD is a subset of GPL's restrictions, so you can include BSD-licensed code in a GPL work.
Re:Show HN: ZFS Implementation in Python by loeg on Saturday May 04, 2019 @02:15PM (#19828181)
Subset isn't quite accurate, but "GPL compatible" might be a good way to describe it.