drbd: debugfs: add per connection oldest requests

Information of former /sys/block/drbdX/drbd/oldest_requests
is already with higher detail in these files:
 debugfs/drbd/resource/$name/in_flight_summary,
 debugfs/drbd/resource/$name/volumes/$vnr/oldest_requests

This patch adds
 debugfs/drbd/resource/$name/connections/peer/oldest_requests

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/block/drbd/drbd_debugfs.c b/drivers/block/drbd/drbd_debugfs.c
index a4d0666a5931..db70d6caf220 100644
--- a/drivers/block/drbd/drbd_debugfs.c
+++ b/drivers/block/drbd/drbd_debugfs.c
@@ -670,6 +670,13 @@ void drbd_debugfs_connection_add(struct drbd_connection *connection)
         if (IS_ERR_OR_NULL(dentry))
                 goto fail;
         connection->debugfs_conn_callback_history = dentry;
+
+        dentry = debugfs_create_file("oldest_requests", S_IRUSR|S_IRGRP,
+                        connection->debugfs_conn, connection,
+                        &connection_oldest_requests_fops);
+        if (IS_ERR_OR_NULL(dentry))
+                goto fail;
+        connection->debugfs_conn_oldest_requests = dentry;
         return;
 
 fail: