Writing a GEOM class, threads that can or cannot sleep

[Owens, Keith]

Looking at https://www.freebsd.org/doc/en/articles/geom-class/article.html, section 4.7.

"The event functions are" ... "These functions are called from the g_down kernel thread and there can be no sleeping in this context".

Correct me if I'm wrong, but only the start event goes via g_down.
dumpconf, orphan, spoiled events go via g_event which can sleep.
access can be called from any code on any thread (including g_down) so it must not sleep.

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