Re:Apple File System
by mioelnir on Monday June 13, 2016 @06:27PM
(#11898263)
Between the ZFS-like features and the advertised "novel copy-on-write metadata" scheme, I would not be surprised if it was partially based on DragonFly's HAMMER/HAMMER2 filesystem.
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| on HN ]
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
Re:Apple File System
by AceJohnny2 on Monday June 13, 2016 @08:52PM
(#11899012)
Licensing.