[PATCH 08/19] nvme-multipath: add nvme_mpath_get_access_state()

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

Add nvme_mpath_get_access_state(), which gets the NS ana_state and
translates into enum mpath_access_state.

This replicates functionality for checking ana state in __nvme_find_path().

Signed-off-by: John Garry <john.g.garry@oracle.com>
---
 drivers/nvme/host/multipath.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 07461a7d8d1fa..a67db36f3c5a5 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -1464,6 +1464,24 @@ void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
 	ctrl->ana_log_size = 0;
 }
 
+static enum mpath_access_state nvme_mpath_get_access_state(
+				struct mpath_device *mpath_device)
+{
+	struct nvme_ns *ns = nvme_mpath_to_ns(mpath_device);
+
+	switch (ns->ana_state) {
+	case NVME_ANA_OPTIMIZED:
+		return MPATH_STATE_OPTIMIZED;
+	case NVME_ANA_NONOPTIMIZED:
+		return MPATH_STATE_ACTIVE;
+	case NVME_ANA_INACCESSIBLE:
+	case NVME_ANA_PERSISTENT_LOSS:
+	case NVME_ANA_CHANGE:
+	default:
+		return MPATH_STATE_INVALID;
+	}
+}
+
 __maybe_unused
 static const struct mpath_head_template mpdt = {
 	.available_path = nvme_mpath_available_path,
@@ -1471,4 +1489,5 @@ static const struct mpath_head_template mpdt = {
 	.del_cdev = nvme_mpath_del_cdev,
 	.is_disabled = nvme_mpath_is_disabled,
 	.is_optimized = nvme_mpath_is_optimized,
+	.get_access_state = nvme_mpath_get_access_state,
 };
-- 
2.43.5