From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch introduces two helpers for obtaining + releasing
nvmet_fabric_ops for nvmet_port usage, and the associated
struct module ops->owner reference.
This is required in order to support nvmet/configfs-ng
and multiple nvmet_port configfs groups living under
/sys/kernel/config/nvmet/subsystems/$SUBSYS_NQN/ports/
Cc: Jens Axboe <axboe@xxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Martin Petersen <martin.petersen@xxxxxxxxxx>
Cc: Sagi Grimberg <sagi@xxxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Mike Christie <michaelc@xxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/nvme/target/core.c | 31 +++++++++++++++++++++++++++++++
drivers/nvme/target/nvmet.h | 3 +++
2 files changed, 34 insertions(+)
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index e0b3f01..9af813c 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -191,6 +191,37 @@ void nvmet_disable_port(struct nvmet_port *port)
module_put(ops->owner);
}
+struct nvmet_fabrics_ops *nvmet_get_transport(struct nvmet_port *port)
+{
+ struct nvmet_fabrics_ops *ops;
+
+ down_write(&nvmet_config_sem);
+ ops = nvmet_transports[port->disc_addr.trtype];
+ if (!ops) {
+ pr_err("transport type %d not supported\n",
+ port->disc_addr.trtype);
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (!try_module_get(ops->owner)) {
+ up_write(&nvmet_config_sem);
+ return ERR_PTR(-EINVAL);
+ }
+ up_write(&nvmet_config_sem);
+
+ return ops;
+}
+
+void nvmet_put_transport(struct nvmet_port *port)
+{
+ struct nvmet_fabrics_ops *ops;
+
+ down_write(&nvmet_config_sem);
+ ops = nvmet_transports[port->disc_addr.trtype];
+ module_put(ops->owner);
+ up_write(&nvmet_config_sem);
+}
+
static void nvmet_keep_alive_timer(struct work_struct *work)
{
struct nvmet_ctrl *ctrl = container_of(to_delayed_work(work),
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 57dd6d8..2bf15088b 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -299,6 +299,9 @@ void nvmet_unregister_transport(struct nvmet_fabrics_ops *ops);
int nvmet_enable_port(struct nvmet_port *port);
void nvmet_disable_port(struct nvmet_port *port);
+struct nvmet_fabrics_ops *nvmet_get_transport(struct nvmet_port *port);
+void nvmet_put_transport(struct nvmet_port *port);
+
void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port);
void nvmet_referral_disable(struct nvmet_port *port);
--
1.9.1
--
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