Find a device given the target
struct scsi_device * scsi_device_lookup_by_target(struct scsi_target * starget, uint lun);
starget
SCSI target pointer
lun
SCSI Logical Unit Number
Looks up the scsi_device with the specified lun for a given starget. The returned scsi_device has an additional reference that needs to be released with scsi_device_put once you're done with it.