how to find interface of IOSCSILogicalUnitNub?

jslisong

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I have one usb device that is muti-Lun Mass Storage Device.

I used example code of SCSITaskLib to send scsi command to cdrom, but how to send scsi command to my device?

In IoRegistor, I find service of my device unter IOUSBMassStorageClass.

My Question 1 is how to find its children nub? how to find its parent nub?
Question 2 is how to find interface of IOSCSILogiclUnitNub, because i want send scsi command directly to my device LUN.

Question3 is where to find document about thest topic?
 
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