On 27 Mar 2017, at 10:13, Thomas Tempelmann <tempelm...@gmail.com> wrote:

> Your answer implies that this message about "locking the volume temporarily" 
> is related to Core Storage volumes.

Indeed it does.  And that’s just wrong.  I completely misread your question and 
thus my answer is way off base.  Sorry.

Getting back to your actual question, my answer is more along the lines of what 
Brendan Shanks wrote.  Last I checked there was no public API for this, but the 
details are in the Darwin source.

ps The keyword you’re looking for is “freeze”.  Your use of the word “lock” is 
what lead me stray.  Monday mornings, eh?  )-:

Share and Enjoy
--
Quinn "The Eskimo!"                    <http://www.apple.com/developer/>
Apple Developer Relations, Developer Technical Support, Core OS/Hardware



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