Copyin and copyout are only possible from a process-native thread,

and therefore we need a way for ioctl handlers to run in that thread
in GEOM.  Rather than invent a complicated registration system to
recognize which ioctl handler to use for a given ioctl, we still
schedule all ioctls down the tree as bio transactions but add a
special return code that means "call me directly" and have the
geom_dev layer do that.

Use this for all ioctls that make it as far as a diskdriver to
avoid any backwards compatibility problems.

Requested by:   scottl
Sponsored by:   DARPA & NAI Labs

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