ceph: include link to bdi in debugfs

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index de5e324..2304bd2 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -143,6 +143,7 @@
 	struct dentry *debugfs_monmap;
 	struct dentry *debugfs_mdsmap, *debugfs_osdmap;
 	struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps;
+	struct dentry *debugfs_bdi;
 #endif
 };