The ramdisk_blocksize option has been broken for quite a while in 2.6.
Making an initrd with a 4K ext2 filesystem impossible to use.

After digging into this, the problem turned out to that rd.c was not
setting the hard sector size.  There were a few secondary problems like
i_blkbits was not being set, and the number KiB in uncompressed ext2 images
was not taking into account the block size.

I have also corrected the surrounding comments as they were not just
incorrect but misleading.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>