[PATCH v2 12/13] nvme-multipath: add nvme_mpath_get_nr_active()

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

Add nvme_mpath_get_nr_active(), which gets the number of active requests
per controller for an mpath_device.

Signed-off-by: John Garry <john.g.garry@oracle.com>
---
 drivers/nvme/host/multipath.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 8025cf3270cdc..62e13a484ff5e 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -1446,6 +1446,11 @@ static enum mpath_iopolicy_e nvme_mpath_get_iopolicy(
 	return mpath_read_iopolicy(&head->subsys->mpath_iopolicy);
 }
 
+static int nvme_mpath_get_nr_active(struct mpath_device *mpath_device)
+{
+	return atomic_read(&nvme_mpath_to_ns(mpath_device)->ctrl->nr_active);
+}
+
 __maybe_unused
 static const struct mpath_head_template mpdt = {
 	.available_path = nvme_mpath_available_path,
@@ -1459,4 +1464,5 @@ static const struct mpath_head_template mpdt = {
 	.chr_uring_cmd = nvme_mpath_chr_uring_cmd,
 	.chr_uring_cmd_iopoll = nvme_ns_chr_uring_cmd_iopoll,
 	.get_iopolicy = nvme_mpath_get_iopolicy,
+	.get_nr_active = nvme_mpath_get_nr_active,
 };
-- 
2.43.5