Hi, I'm writing kernel module for 2.6 linux.
The purpose is to intercept all writes to disk devices and to notify user
mode application about sector/length of write.
I want to change function pointers of request_fn and make_request_fn to my
own routines.
The question is what is a difference between this two functions?
Sometimes I see device like sda which has both pointers and both functions
get called upon I/O.
Sometimes I see only make_request_fn (for instance in LVM case).
Which function should I intercept?
I did it for make_request_fn and checked with application that writes to
some sector on disk. But in kernel I got write to different location.
Make_request_fn gets bio as parameter so I got writes info from it, but
request_fn gets only queue as parameter.
Thank you for help
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