I am working on a tool that makes an image snapshot of a bootable HFS
volume. If the volume can be unmounted, that's an easy task. But when it's
the boot volume, this doesn't work, of course.

Now, I've seen that DFA in Sierra seems to be able to lock a volume so that
it can verify and possibly repair it.

How does DFA do that? Is there some OS function I could use for that
purpose, too?

-- 
Thomas Tempelmann, http://www.tempel.org/
Follow me on Twitter: https://twitter.com/tempelorg
Read my programming blog: http://blog.tempel.org/
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