[PATCH v3] nvme: enable FDP support

[Kanchan Joshi]

On 7/2/2024 5:09 PM, Christoph Hellwig wrote:
> Same NAK as before.  FDP was intentionally designed to not fit the
> clearly documented Linux needs.

That was not the design goal of FDP. It is ludicrous for any storage 
technology to have that as an intentional design choice.

> If you want support for Linux data
> temperature hints work with the NVMe technical working group to make
> it happen.

The value does not come from the temperature-sensitive names that we 
have in Linux. It rather comes from keeping the WAF low and from using 
Linux file-sytems. The write-hint interface, despite not being ideal, 
happens to be the only interface we got for the latter.

If/when anything different grows in the device-side, we can trivially 
change the plumbing this patch does.

People need support for what we have in current spec and more 
importantly in products. It's not a Meta/Samsung only thing. Many 
hypsercalers and enterprise customers need this.