[PATCH v4 5/5] nvme: enable FDP support

[Keith Busch]

On Mon, Aug 26, 2024 at 10:36:06PM +0530, Kanchan Joshi wrote:
> Flexible Data Placement (FDP), as ratified in TP 4146a, allows the host
> to control the placement of logical blocks so as to reduce the SSD WAF.
> 
> Userspace can send the data placement information using the write hints.
> Fetch the placement-identifiers if the device supports FDP.
> 
> The incoming placement hint is mapped to a placement-identifier, which
> in turn is set in the DSPEC field of the write command.
> 
> Signed-off-by: Kanchan Joshi <joshi.k at samsung.com>
> Signed-off-by: Nitesh Shetty <nj.shetty at samsung.com>
> Signed-off-by: Hui Qi <hui81.qi at samsung.com>

I'm still fine with this nvme implementation.

Acked-by: Keith Busch <kbusch at kernel.org>

The reporting via fcntl looks okay to me, but I've never added anything
to that interface, so not sure if there's any problem using it for this.