diff --git a/src/add-ons/kernel/file_systems/bfs/Lock.h b/src/add-ons/kernel/file_systems/bfs/Lock.h
index 7789e00e01..220be5420b 100644
--- a/src/add-ons/kernel/file_systems/bfs/Lock.h
+++ b/src/add-ons/kernel/file_systems/bfs/Lock.h
@@ -360,6 +360,11 @@ class SimpleLock {
 				atomic_set(&fHolder, -1);
 		}
 
+		bool IsLocked() const
+		{
+			return fHolder == find_thread(NULL);
+		}
+
 	private:
 		vint32	fHolder;
 		vint32	fCount;