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 <nidhimittal19@xxxxxxxxx> 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." -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
