[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 #31 from Steven Hartland <smh at FreeBSD.org> ---
(In reply to kash from comment #30)
> (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.

I believe this is around FS locking. The reason for the divergence in the code
bases around ZVOLs is due to the fact that upstream creates ZVOL dev entries on
the demand when a /dev/ lookup takes place. This is something FreeBSD currently
can't do hence the various static create/destroy/rename in various places so
they are always available.

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