[PATCH v4 07/15] nvme: Introduce FENCING and FENCED controller states

[Randy Jennings]

On Fri, Mar 27, 2026 at 5:46 PM Mohamed Khalfella
<mkhalfella at purestorage.com> wrote:
>
> FENCING is a new controller state that a LIVE controller enters when an
> error is encountered. While in FENCING state, inflight IOs that timeout
> are not canceled because they should be held until either CCR succeeds
> or time-based recovery completes. While the queues remain alive, requests
> are not allowed to be sent in this state, and the controller cannot be
> reset or deleted. This is intentional because resetting or deleting the
> controller results in canceling inflight IOs.
>
> FENCED is a short-term state the controller enters before it is reset.
> It exists only to prevent manual resets from happening while controller
> is in FENCING state.
>
> Signed-off-by: Mohamed Khalfella <mkhalfella at purestorage.com>

Reviewed-by: Randy Jennings <randyj at purestorage.com>