[PATCH 1/3] nvmet: make the subsystem type configurable

[Sagi Grimberg]

> Make the subsystem type configurable to allow for unique
> discovery subsystems by changing the subsystem type to
> 'discovery'.
> 
> Signed-off-by: Hannes Reinecke <hare at suse.de>
> ---
>   drivers/nvme/target/configfs.c  | 60 +++++++++++++++++++++++++++++++++
>   drivers/nvme/target/discovery.c |  2 +-
>   drivers/nvme/target/nvmet.h     |  1 +
>   3 files changed, 62 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
> index e44b2988759e..38b0ab9fb721 100644
> --- a/drivers/nvme/target/configfs.c
> +++ b/drivers/nvme/target/configfs.c
> @@ -834,6 +834,7 @@ static int nvmet_port_subsys_allow_link(struct config_item *parent,
>   	}
>   
>   	list_add_tail(&link->entry, &port->subsystems);
> +	subsys->port_count++;
>   	nvmet_port_disc_changed(port, subsys);
>   
>   	up_write(&nvmet_config_sem);
> @@ -862,6 +863,7 @@ static void nvmet_port_subsys_drop_link(struct config_item *parent,
>   
>   found:
>   	list_del(&p->entry);
> +	subsys->port_count--;
>   	nvmet_port_del_ctrls(port, subsys);
>   	nvmet_port_disc_changed(port, subsys);
>   
> @@ -1234,6 +1236,63 @@ static ssize_t nvmet_subsys_attr_model_store(struct config_item *item,
>   }
>   CONFIGFS_ATTR(nvmet_subsys_, attr_model);
>   
> +static const struct nvmet_type_name_map nvmet_subsys_type_map[] = {
> +	{ NVME_NQN_DISC,	"referral" },
> +	{ NVME_NQN_NVME,	"nvme" },
> +	{ NVME_NQN_CURR,	"discovery" },
> +};

Wait, what does this mean? I don't understand how the type maps to
the string?