In order to keep the RAM usage down with large devices and smaller
erase block sizes, we were using blocks in JFFS2 larger than the 
physical erase size. This means that bad blocks lose a lot more space
though; allow it to be disabled.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>