Also, see this thread and the reply from Greg.
http://mail.nl.linux.org/kernelnewbies/2009-01/msg00241.html
Ccing Greg as well.
HTH,
On Sun, Feb 1, 2009 at 3:20 PM, nidhi mittal <nidhimitta...@gmail.com> wrote:
> hello
> i was writing my initial block device driver following LDD
> but was totally confused on KERNEL SECTOR SIZE and hardware sector size
> issue they discussed in that .
>
> they write sth like
> if sector number passed between kernel and block layer it should be
> something and
> if its passed between blocklayer and driver it should be something else.
>
> means at different place some confusing note abt sector size
> can someone clear it to me in simple 2-3 sentences
>
> At what places , in which function i shd consider sending sector size with a
> thought that
> at this place it understand sector= 512 bytes
> and
> At what places , in which function i shd consider sending sector size as my
> hardware sector size
> in thinking that it understand 2048 bytes ...
>
> and
> most important
> in book they write
>
> blk_queue_hardsect_size(request_queue_t *queue , unsigned short max );
> "All the communication from block layer and driver is in 512 bytes but all
> request generated by kernel are multiple of
> hardware sect size and properly aligned "
>
> so i wanted to know where actually is block layer and where is driver
> where are they separated how do i know when i m going from block layer to
> driver ....
> what i understand is ONLY user space and kernel space
>
> it will be very kind if someone clears it to me.
> thanks
> Nidhi
>
>
> Thanks & Regards
> Nidhi
--
Regards,
Sandeep.
"To learn is to change. Education is a process that changes the learner."
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