Linked by Thom Holwerda on Mon 7th Jun 2010 10:15 UTC, submitted by kragil
Linux Employees of Lawrence Livermore National Laboratory have ported Sun's/Oracle's ZFS natively to Linux. Linux already had a ZFS port in userspace via FUSE, since license incompatibilities between the CDDL and GPL prevent ZFS from becoming part of the Linux kernel. This project solves the licensing issue by distributing ZFS as a separate kernel module users will have to download and build for themselves.
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CDDL is equally incompatible with both GPL versions.

Incompatibility is because GPL and CDDL are both copyleft licenses and neither permit re-licensing code to any other license; CDDL code is availabe under CDDL only and GPL code is available under GPL only. GPL's copyleft is wider and stronger, it requires all derivatives and extensions of GPL'd code to be under GPL-compatible license as well, while CDDL apply only to specific source files and allows proprietary extensions (or open source, as long it is not GPL). There are lot other differences, but this is biggest.

So, ZFS becomes part of kernel when is merged, and whole kernel is GPL. Since CDDL does not alow re-licensing to GPL, it can't be merged.

All this is not by mistake. Sun have chosen GPL incompatible license for OpenSolaris and ZFS on purpose. Danese Cooper is the one who actually wrote CDDL, and she said on Debian conference in 2006 that special requirement for was that license must be GPL-incompatible. Here is the link

PS: Watch at 11:30 and later.

So whole crack-pot idea of changing Linux to CDDL is crazy. Day when Linux switches to CDDL would be the day when ZFS switch to something else and Linux would be stuck with oldish version.

Not like that is going to happen, Solaris is going proprietary anyway.

Edited 2010-06-08 08:56 UTC

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