diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h
index 8ffc90c..cf83e77 100644
--- a/fs/ext4/extents_status.h
+++ b/fs/ext4/extents_status.h
@@ -106,4 +106,9 @@
 	es->es_pblk = block;
 }
 
+extern void ext4_es_register_shrinker(struct super_block *sb);
+extern void ext4_es_unregister_shrinker(struct super_block *sb);
+extern void ext4_es_lru_add(struct inode *inode);
+extern void ext4_es_lru_del(struct inode *inode);
+
 #endif /* _EXT4_EXTENTS_STATUS_H */