Looking for Docs: how to queue SCSI commands from within the kernel

I am developing a SCSI low-level driver that does some virtualization 
and then needs to queue up commands to other, "real" SCSI devices.  I 
presume that I will be queuing up commands to the mid-layer, just like 
the other high-level drivers do.  Where can I read about how to do this?
Thanks in advance,
   Russ Lewis

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