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For someone familiar with Linux kernel programming, what are some resources for getting started with OSX kernel programming? I’ve read some of the Apple Developer resources, but they seem fairly generic (e.g. basic concurrency control primitives). Specifically I am interested in file system development.
Amit Singh’s book “Mac OS X Internals” contains a chapter describing the Implementation of HFS+, which might be helpful. If you find resources describing BSD’s VFS layer, that might help too, as that’s where OS X’s VFS layer originates (though with its own page cache, called the Unified Buffer Cache or UBC). Moreover, you could try poking around in the source code of MacFuse and its descendants. Looking at the source of some of the simpler file systems (HFS+ is a bit big for this) will probably also help.