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
