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If you poke around in the the APFS kernel extension, it's not a very big binary, given the feature set. (It's a 550K extension, compared to the 2.5MB zfs.ko on FreeBSD.) I haven't disassembled it yet, but I'd wager that APFS is layered atop Core Storage btrees/CoW. Since that code's been shipping since 2011, maybe APFS stabilizes faster than a true greenfield filesystem?

(That does leave me wondering how interesting an open-source APFS would be without an open-source Core Storage.)

> It's a 550K extension, compared to the 2.5MB zfs.ko on FreeBSD

hammer.ko is 494KB in the latest DFBSD, for those wondering the obvious.

I was thinking the exact same thing!

It would be fantastic if they actively helped with HAMMER2 development.

It would be a strange kind of NIH that excluded ZFS but welcomed HAMMER...

different licensing and HAMMER demands significantly less memory

Licensing.