[PATCH v2] nvme: enable FDP support

[Christoph Hellwig]

Nacked-by: Christoph Hellwig <hch at lst.de>

This is a really overcomplicated way that does not in any way fit the
FDP use case (which is also rather overcomplicated).

If you want to pass on life time information to a NVMe device please
work with the NVMe technical working group to add the equivalent of
the life time hints added to SCSI as part of the
constrained streams in SBC.  It would be implementable in the Linux
nvme driver in a few lines of code, similaly trivially in the device
and actually makes things work.