On lwn there is a piece of code for a Simple Block Device driver:
http://lwn.net/Articles/58720/ . It is for an older kerner and someone
ported it to a newer kernel:
http://blog.superpat.com/2010/05/04/a-simple-block-driver-for-linux-kernel-2-6-31/
This code works fine al long as you do not touch the logical_block_size
paramater. Increasing it to 1024, 2048 or 4096 ends in a disaster, but
not in the code itself. Anything can happen, instant reboot, instant
hang, endless traces over the serial line.
I have added blk_queue_physical_block_size to sbd_init but that dit not
help.
I want to write a dedup block device, and do not want to be stuck at a
512 bytes sector size. 4k is small enough
--
Hans
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