[PATCH] nvme: retrigger ANA log update if group descriptor isn't found

[Sagi Grimberg]

> If ANA is enabled but no ANA group descriptor is found when creating
> a new namespace the ANA log is most likely out of date, so trigger
> a re-read. The namespace will be tagged with the NS_ANA_PENDING flag
> to exclude it from path selection until the ANA log has been re-read.
> 
> Reported-by: Martin George <marting at netapp.com>
> Signed-off-by: Hannes Reinecke <hare at suse.de>
> ---
>   drivers/nvme/host/multipath.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
> index 74896be40c17..ee4a42dc99a0 100644
> --- a/drivers/nvme/host/multipath.c
> +++ b/drivers/nvme/host/multipath.c
> @@ -667,6 +667,10 @@ void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id)
>   		if (desc.state) {
>   			/* found the group desc: update */
>   			nvme_update_ns_ana_state(&desc, ns);
> +		} else {
> +			/* group desc not found: trigger a re-read */
> +			set_bit(NVME_NS_ANA_PENDING, &ns->flags);
> +			queue_work(nvme_wq, &ns->ctrl->ana_work);

btw, I just commented on the original thread, but I do like this
one better.

Reviewed-by: Sagi Grimberg <sagi at grimberg.me>