That was 2005 - 2019 ZoL is a true open-source project

According to their repo, it is still under CDDL, which is said license. That it is an open-source license doesn't mean it is compatible with GPL (if it is appears to still be a hotly debated topic, but the kernel devs have picked one stance)

Right, but it's still not GPL, it's CDDL, so it can't use GPL'd parts of the Kernel.

As the other posters have pointed out - it's definitely an open source project with an open source license, but it's the CDDL. Same as it was in 05.

I love ZFS, use it on my server. It sucks that this has happened but AFAICT it's the result of a license choice made way back when, and it's still impacting things now.

There are competing file systems on Linux which are more aligned with Linux goals and much better integrated with kernel. If ZFS won't work very well on Linux, it gives more chances for those alternative file systems (btrfs, bcachefs), so hopefully one day they'll be proper replacements and ZFS won't be needed at all. This is political thing indeed.

Anyway you can always patch the kernel. It won't be as easy to install, but e.g. Ubuntu should be able to do so.

So you're saying that Greg K-H is intentionally breaking ZFS in Linux so as to promote btrfs and bcachefs?

That's a big accusation.

Do you have any evidence?

I remember reading about BTRFS parity patches that were shelved because they didn't align with someone's business interests. Maybe a storage vendor is exerting some pressure to impede modern file systems on Linux.