[PATCH v2 10/13] nvme-multipath: add nvme_{add,delete}_ns()

[John Garry <john.g.garry@oracle.com>]

Add functions to call into the mpath_add_device() and mpath_delete_device()
functions.

The per-NS gendisk pointer is used as the mpath_device disk pointer, which
is used in libmultipath for references the per-path block device.

Signed-off-by: John Garry <john.g.garry@oracle.com>
---
 drivers/nvme/host/nvme.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index cc63ed8131c36..b4fe7a7dd7f73 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -1025,6 +1025,19 @@ extern const struct block_device_operations nvme_bdev_ops;
 
 void nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl);
 struct nvme_ns *nvme_find_path(struct nvme_ns_head *head);
+
+static inline void nvme_add_ns(struct nvme_ns *ns)
+{
+	ns->mpath_device.disk = ns->disk;
+	ns->mpath_device.numa_node = ns->ctrl->numa_node;
+	mpath_add_device(ns->head->mpath_head, &ns->mpath_device);
+}
+
+static inline bool nvme_delete_ns(struct nvme_ns *ns)
+{
+	return mpath_delete_device(&ns->mpath_device);
+}
+
 #ifdef CONFIG_NVME_MULTIPATH
 static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 {
-- 
2.43.5