libceph: expose client options through debugfs

Add a client_options attribute for showing libceph options.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
index 303be6e..30f92ce 100644
--- a/include/linux/ceph/libceph.h
+++ b/include/linux/ceph/libceph.h
@@ -135,6 +135,7 @@
 	struct dentry *debugfs_dir;
 	struct dentry *debugfs_monmap;
 	struct dentry *debugfs_osdmap;
+	struct dentry *debugfs_options;
 #endif
 };