I would expect that the path being taking with the iPad Pro series could lead
to multiple volumes, among other things making the iPad more like a “computer”.
But, I would not make product plans for near term based on that thought.
Jim
James R. Cutler
[email protected]
GPG keys: hkps://hkps.pool.sks-keyservers.net
> On May 6, 2019, at 4:33 PM, Thomas Tempelmann <[email protected]> wrote:
>
> The think that most closely resembles the HFS catalog isn't shared amongst
> volumes.
>
> But it is. There is one btree for all volumes in a container (well,
> technically, there are two btrees, one for the IDs and one for the actual
> file catalog, but both are shared over all vols).
>
> clonefile(2) has the same restriction as link(2) and rename(2), it has to be
> done within the same volume/mounted filesystem.
>
> So that's an API restriction, but not a technically necessary one on APFS,
> IMO. I guess APFS was created with iOS in mind, where we do not have multiple
> volumes, so no one gave this a second thought. It's a shame, as it could have
> some great savings when sharing volumes in some situations like the one I
> described. Still, it's a niche, and so I'm not hopeful this will get
> improved. Sigh.
>
> Thomas
>
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