struct request question

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HI all

Could anyone please help me understand these ? :

unsigned long hard_sector, hard_nr_sectors;
unsigned int nr_segments;
unsigned int nr_hw_segments

I understand
sector :first  sector number in the queue
nr_sectors: total sectors in the queue
current_nr_sectors : total sectors in the current block

How are these related is what I am trying to understand .

Thanx
Narasimhamurthy Giri, Clemson University Computer Science Dept.
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