On Fri, Nov 03, 2017 at 09:02:04AM -0600, Keith Busch wrote: > If the namespace has metadata, but the request doesn't have a metadata > payload attached to it for whatever reason, we can't construct the command > for that format. We also can't have the controller strip/generate the > payload with PRACT bit set if it's not a T10 format, so we just fail > the command.
The only metadata payload a READ or WRITE request can have is a protection information one. For a namespace formatted with protection information bio_integrity_prep as called from blk_mq_make_request will ensure we always have metadata attached. If a namespace is formatted with non-PI metadata we will never have metadata attached to the bio/request and should not even present the namespace to the kernel.
