Relation between PFN and page block ?

Dear All,
 
I am trying to understand the relation between "Page Frame Number" and "Page Block".
Like how to find out if a particular page frame is associated with which page block.
 
I have looked into Documentation/vm/pagemap but could not understand the exact mapping.
 
Can somebody explain me in detail how page frame number and page block are related.
 
 
Thanks,
Pintu

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