Question on NVMe SCSI Translation Ref 1.5

[Christoph Hellwig]

Hi Jeffrey,

SG_IO is sent to a device node.  For actualy SCSI devices you'll
get the LUN from sdev->lun.  For NVMe there obviously aren't any LUNs,
so you'll have to come up with a tranlation.  The current Linux driver
translated namespaces 1 to LUN 0 and so on.  In general sending a
REPORT LUNS to a NVMe device node does not seem very useful, and I have
no idea why it even was specified.  Then again the whole SCSI
translation layer concept seems incredbile braindead and I think we
should at least optionally remove it from the NVMe driver.