the best route may be to enhance hfsutils for hfs+ support. you don't have
to worry about the complexity of multiple readers/writers that way but you
get a useful, practical result. then jump into writing the kernel code
after it works satisfactorily.
So you can start with the userspace app and then port that to the kernel? And
is it already GPL? Cool. Who wants to start on that? :^)
=====
"Don't expect your own messiah; this neverworld which you desire is
only in your mind." -- http://www.dreamtheater.net/songb4.htm#IV5
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