f2fs: Update to proper 3.4 support

http://git.kernel.org/cgit/linux/kernel/git/jaegeuk/f2fs.git/log/?h=linux-3.4

Change-Id: Ica17871e847d4807c7ef24ea77dd4bff5451f5c7

Conflicts:
	fs/f2fs/f2fs.h
diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
index 7281112..8a116a4 100644
--- a/fs/f2fs/node.h
+++ b/fs/f2fs/node.h
@@ -89,6 +89,13 @@
 	DIRTY_DENTS	/* indicates dirty dentry pages */
 };
 
+struct nat_entry_set {
+	struct list_head set_list;	/* link with all nat sets */
+	struct list_head entry_list;	/* link with dirty nat entries */
+	nid_t start_nid;		/* start nid of nats in set */
+	unsigned int entry_cnt;		/* the # of nat entries in set */
+};
+
 /*
  * For free nid mangement
  */