G+ is a train wreck for a number of reasons, this included.
Yeah, he's not a fan of HFS+ at all. Wasn't the plan to move to ZFS prior to the Oracle acquisition of Sun? Hopefully that ends up back on track somehow.
Yeah, he's not a fan of HFS+ at all. Wasn't the plan to move to ZFS prior to the Oracle acquisition of Sun? Hopefully that ends up back on track somehow.
And even if they did build a new FS, there are some assumptions like case insensitivity that likely couldn't be abandoned without potentially breaking backwards compatibility.
Apple's Core Storage does have some COW properties, so they could probably do something like linux LVM thin provisioning style snapshots. They could maybe add a tree for checksums, which would be a good idea for the journal at least but seeing as this hasn't been a priority for even just the journal, the most unencumbered and recent add-on, it seems obviously not a priority. The COW stuff was necessary to automagically migrate data from the SSD to the HDD in their so called "fusion drive", so maybe they leverage that for an updated version of Time Machine and could also do it for atomic online OS/software update with an optional later reboot rather than a mandatory one.
One rather cool thing it does is on-the-fly encryption and decryption of an LV. You can even reboot in the middle of either conversion and it resumes where it left off. And those encrypted volumes can be resized (that's not well documented but is supported and is even used by their own Boot Camp Assistant).
So about the limit of the new fs is an LVM like thing under journaled-HFS+/X.
3rd-party: there's the non-FUSE port https://openzfsonosx.org/
Apple sells far more iOS devices than Macs these days, and the iOS filesystem is case-sensitive HFS+. It's hard to imagine Apple doing something new in filesystems that doesn't improve the platform they make the most money from.
In a way, the same logic applies to Macs. The number of Macs that support multiple internal disks will soon be zero if it isn't already, so some of the best features of ZFS are irrelevant on new Apple computers.
I just finished reinstalling Yosemite an hour ago after wiping the HD of a friend's new laptop. It would not allow me to get past the eligibility check until I logged in with a valid Apple ID.
For the vast majority of people this will never be an issue as the machine comes pre-installed and re-installing the OS is generally not required unless something major goes wrong.