diff --git a/src/buffer.c b/src/buffer.c
index 34500e4..90be301 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -497,6 +497,12 @@
     return can_unload;
 }
 
+    int
+buf_locked(buf_T *buf)
+{
+    return buf->b_locked || buf->b_locked_split;
+}
+
 /*
  * Close the link to a buffer.
  * "action" is used when there is no longer a window for the buffer.