[RFC PATCH 07/14] nvme: Add RECOVERING nvme controller state

[Randy Jennings]

On Tue, Nov 25, 2025 at 6:13 PM Mohamed Khalfella
<mkhalfella at purestorage.com> wrote:
>
> Add NVME_CTRL_RECOVERING as a new controller state to be used when
> impacted controller is being recovered. A LIVE controller enters
> RECOVERING state when an IO error is encountered. While recovering
> inflight IOs will not be canceled if they timeout. These IOs will be
> canceled after recovery finishes. Also, while recovering a controller
> can not be reset or deleted. This is intentional because reset or delete
> will result in canceling inflight IOs. When recovery finishes, the
> impacted controller transitions from RECOVERING state to RESETTING state.
> Reset codepath takes care of queues teardown and inflight requests
> cancellation.
>
> Note, there is no transition from RECOVERING to RESETTING added to
> nvme_change_ctrl_state(). The reason is that user should not be allowed
> to reset or delete a controller that is being recovered.
>
> Add NVME_CTRL_RECOVERED controller flag. This flag is set on a controller
> about to schedule delayed work for time based recovery.
>
> Signed-off-by: Mohamed Khalfella <mkhalfella at purestorage.com>

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