[PATCH v2 08/13] 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-subsysten, 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 | 9 +++++++++
 drivers/nvme/host/nvme.h      | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index a51944ca56b1f..8025cf3270cdc 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -1438,6 +1438,14 @@ 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;
+
+	return mpath_read_iopolicy(&head->subsys->mpath_iopolicy);
+}
+
 __maybe_unused
 static const struct mpath_head_template mpdt = {
 	.available_path = nvme_mpath_available_path,
@@ -1450,4 +1458,5 @@ static const struct mpath_head_template mpdt = {
 	.ioctl_finish = nvme_mpath_ioctl_finish,
 	.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 efa868ba3fbf8..01a7a25bcd254 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