devctl attach/detach notification for disks

[Nate Nielsen]

I'm working on a bit of code to get devctl notifications for attaching
and removing of disks. This would allow actions to be taken via devd
when a disk is attached or removed from the system.

Currently I have the attach and detach notifications hooked into
disk_create() and disk_destroy() in geom_disk.c. See attached (rough)
patch.

However at these points the disks are not yet present in the /dev/
filesystem. Anyone have any clues or tips for a better place to hook
these notifications into the system?

Cheers,
Nate

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