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Logging disk access in block level?

Hello,

I want to save the access log of disk in block level.
The number of block in disk and the I/O type (R/W) of 
the request are needed for me.

What should I modify to save the log? In block cache
code? or EXT{2,3}?

Thank you in advance.

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APL, but I can't read any of them. -- Roy Keir

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