[PATCH]Add erase count tracking support in JFFS2

[zhao forrest]

Hi,

I refine the code again according to Joern's comments.
Here is an explanation of implementation details.

A new node type JFFS2_NODETYPE_ERASE_COUNT is introduced to store
the erase count of each erase block. So JFFS2_NODETYPE_ERASE_COUNT
is like JFFS2_NODETYPE_CLEANMARKER and is a per-erase-block node.
For NOR flash, JFFS2_NODETYPE_ERASE_COUNT tightly follow the
JFFS2_NODETYPE_CLEANMARKER; for NAND flash, JFFS2_NODETYPE_ERASE
_COUNT is stored in the OOB area of second page.

*How to work?

[FS mounting]
During JFFS2 mounting, the erase count is read out from 
JFFS2_NODETYPE_ERASE_COUNT and is stored in the new field
"erase_count" of struct jffs2_eraseblock.

[erase the block]
Each time the erasing operation of an erase block complete,
increase "erase_count" of struct jffs2_eraseblock. Then write
JFFS2_NODETYPE_ERASE_COUNT to erase block after JFFS2_NODETYPE_
CLEANMARKER has been written.

Thanks,
Forrest

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