[PATCH v2 2/2] nvme-multipath: fix path failover for integrity ns

[Martin K. Petersen]

Hi Max!

> The way I see it now, and I might be wrong, is that the Linux kernel
> is not supporting application to store apptag values unless it's using
> some passthrough command.

As Keith mentioned, there are various ways.

But let's assume you are a multipathed storage device that says "Yes, I
support encryption". And then one of the paths doesn't and just lets
things go across the wire in plain text.

I think most people would agree that would be a *bad* thing.

The expectation is that when a device reports that a capability is
enabled, that this capability is actually effective. Protection
information is no different. The PI is part of the data and it needs to
be validated by the recipient.

Silently throwing away the protection information defies the very
premise of why data integrity protection was defined in the first place.

-- 
Martin K. Petersen	Oracle Linux Engineering