Comment 9 for bug 1602299

Not sure. That talks about the location of the super block. It does not seem to change the size. But then it could be that this papers over things if the offset of data in the page returned by __bread depends on the relative location of a disk section within a page size area. So reading block one with a 4k block size gives a 4k offset with >4k pages...

I find the way they attach the page used by the buffer head to their internal bio structures rather unclean...