[Bug 193803] zvol rename failing due to out of order locking

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193803

--- Comment #30 from kash at tripleback.net ---
(In reply to Steven Hartland from comment #28)
> So just to confirm, this does fix your deadlock issue?
> 
> For reference the current locking for zvol changes is actually quite
> specific to FreeBSD so not really an upstream issue.

Richard Yao was saying there's potential for converging the pathways still, ZoL
and Illumos have different ways of structuring locks, and thought the way this
was handled is a bit too similar to the Big Kernel Lock, but I don't know much
about this, I'm a less articulate coder.

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