diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 2548bfd..bed0dc9 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -237,6 +237,12 @@
 	unsigned int next_segno;		/* preallocated segment */
 };
 
+struct sit_entry_set {
+	struct list_head set_list;	/* link with all sit sets */
+	unsigned int start_segno;	/* start segno of sits in set */
+	unsigned int entry_cnt;		/* the # of sit entries in set */
+};
+
 /*
  * inline functions
  */