diff --git a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
index e47328f..4a2df57 100644
--- a/include/linux/reiserfs_fs.h
+++ b/include/linux/reiserfs_fs.h
@@ -59,6 +59,8 @@
  */
 void reiserfs_write_lock(struct super_block *s);
 void reiserfs_write_unlock(struct super_block *s);
+int reiserfs_write_lock_once(struct super_block *s);
+void reiserfs_write_unlock_once(struct super_block *s, int lock_depth);
 
 struct fid;