[PATCH]Add erase count tracking support in JFFS2

[zhao forrest]

Hi,

This patch adds the "erase count tracking" support in JFFS2.
In particular it records the erase count of each erase block.
By knowing the erase count of each erase block, we can further
enhance the current wear-leveling algorithm of random nature
in JFFS2.
So this patch is also the basis of my future patch for
enhancing the wear-leveling algorithm in JFFS2.

Your comments are highly welcome.

Thanks,
Forrest

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