At some point something talks to the device -- in this case, it's the
SCSI layer. Follow the interfaces in the kernel and it becomes obvious.
> Where does the responsibility lie for figuring out the capabilities?
> Further, which device node/fs/driver exports the capability list?
> And what about locking between drivers?
Orthogonal issue. You may want a locking mechanism, but it almost
certainly should not be automatic.
Note that especially ide-scsi is a good example on how *not* to do
things. The fact that you have to choose one of two interfaces for
different operations (I can't use a CD-writer in the default
configuration!) is insane.
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