diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h
index 3f69d09..8ffc90c 100644
--- a/fs/ext4/extents_status.h
+++ b/fs/ext4/extents_status.h
@@ -53,6 +53,8 @@
 				 ext4_lblk_t len);
 extern void ext4_es_find_delayed_extent(struct inode *inode, ext4_lblk_t lblk,
 					struct extent_status *es);
+extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
+				 struct extent_status *es);
 
 static inline int ext4_es_is_written(struct extent_status *es)
 {