Trapping Block I/O

[Block Device]

Hi,

    I need to trap _all_ the I/O going to each and every block device
in the system. I used jprobes to trap calls to generic_make_request.
Is this the correct/only place to do such a thing ?
Or do I have to monitor the q->make_request_fn for every device ?

Thanks & Regards
-BD.
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