8030048: (fs) Support UserDefinedFileAttributeView/extended attributes on OS X / HFS+

[Janiru Tec]

>From my perspective the Linux implementation can be ported or at least be
used for many parts. It heavily utilizes an "Unsafe"-class, tho. Is this a
Problem in modern Implementations?
As far as I can see the support itself is added using it's own class that
is loaded by a provider, macOS would probably be the best pick for that.

- Dominik

> Adding support for this attribute view on macOS has been on the list for
a long time but never bubbled to the top of anyone's list. So I don't think
anyone has spent any time on it. One starting point is to look at the Linux
implementation and see if it can be ported over. Discussion points will be
whether the support is added to the BSD provider or the macOS provider,
also details on the encoding of the attribute name.
>
> -Alan.
>
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