diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h
index 81e9339..85115bb 100644
--- a/fs/ext4/extents_status.h
+++ b/fs/ext4/extents_status.h
@@ -20,10 +20,18 @@
 #define es_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
 #endif
 
+enum {
+	EXTENT_STATUS_WRITTEN = 0,	/* written extent */
+	EXTENT_STATUS_UNWRITTEN = 1,	/* unwritten extent */
+	EXTENT_STATUS_DELAYED = 2,	/* delayed extent */
+};
+
 struct extent_status {
 	struct rb_node rb_node;
 	ext4_lblk_t es_lblk;	/* first logical block extent covers */
 	ext4_lblk_t es_len;	/* length of extent in block */
+	ext4_fsblk_t es_pblk;	/* first physical block */
+	int es_status;		/* record the status of extent */
 };
 
 struct ext4_es_tree {