[PATCH 11/19] nvme-multipath: add nvme_mpath_get_iopolicy()

[John Garry]

Add a function to return the iopolicy for the head structure.

Since iopolicy for NVMe is currently per-subsystem, we add the
mpath_iopolicy struct to the subsystem struct, and
nvme_mpath_get_iopolicy() needs to access that member.

Signed-off-by: John Garry <john.g.garry at oracle.com>
---
 drivers/nvme/host/multipath.c | 10 ++++++++++
 drivers/nvme/host/nvme.h      |  1 +
 2 files changed, 11 insertions(+)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 12386f9caa72a..6cadbc0449d3d 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -1464,6 +1464,15 @@ void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
 	ctrl->ana_log_size = 0;
 }
 
+static enum mpath_iopolicy_e nvme_mpath_get_iopolicy(
+				struct mpath_head *mpath_head)
+{
+	struct nvme_ns_head *head = mpath_head->drvdata;
+	struct nvme_subsystem *subsys = head->subsys;
+
+	return mpath_read_iopolicy(&subsys->mpath_iopolicy);
+}
+
 static enum mpath_access_state nvme_mpath_get_access_state(
 				struct mpath_device *mpath_device)
 {
@@ -1494,4 +1503,5 @@ static const struct mpath_head_template mpdt = {
 	.cdev_ioctl = nvme_mpath_cdev_ioctl,
 	.chr_uring_cmd = nvme_mpath_chr_uring_cmd,
 	.chr_uring_cmd_iopoll = nvme_ns_chr_uring_cmd_iopoll,
+	.get_iopolicy = nvme_mpath_get_iopolicy,
 };
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index bc0ad0bbb68fd..da9bd1ada6ad6 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -502,6 +502,7 @@ struct nvme_subsystem {
 	struct ida		ns_ida;
 #ifdef CONFIG_NVME_MULTIPATH
 	enum nvme_iopolicy	iopolicy;
+	struct mpath_iopolicy mpath_iopolicy;
 #endif
 };
 
-- 
2.43.5