[Yaffs] isshrink header

Here we suppose we creat tom under "root" and write some data and resize tom to get jack. So the pattern on the flash would be:oh_tom -> data_1x -> data_1y_shrinked -> oh_jack_shrinked  So i am wonder how can we difference which chunk is resized by the shirnk header.For example, we resize data_1x oh_tom -> data_1x_shrinked -> data_1y-> oh_jack_shrinked  So how to difference those two operation by the shrink header?