[PATCH 13/14] megaraid_sas: NVME passthru command support

[Christoph Hellwig]

On Tue, Jan 09, 2018 at 10:07:28PM +0530, Kashyap Desai wrote:
> Chris -
> 
> Overall NVME support behind MR controller is really a SCSI device. On top
> of that, for MegaRaid, NVME device can be part of Virtual Disk and those
> drive will not be exposed to the driver. User application may like to talk
> to hidden NVME devices (part of VDs). This patch will extend the existing
> interface for megaraid product in the same way it is currently supported
> for other protocols like SMP, SATA pass-through.
> 
> Example - Current smartmon is using megaraid.h (MFI headers) to send SATA
> pass-through.
> 
> https://github.com/mirror/smartmontools/blob/master/megaraid.h

And that is exactly the example of why we should have never allowed
megaraid any private passthrough ioctls to start with.