Re: raid5: coding style cleanup / refactor

quoted

I assume that you're prepared to repair all that damage to your tree, but
it seems a bit masochistic?

It's either this or have an inconsistent coding style throughout
raid5.c.  I figure it is worth it to have reduced code duplication
between raid5 and raid6, and it makes it easier to add new cache
features going forward.  I have a few more cleanups to add for a rev2 of
this patch, but I will hold that off until the rebase is done.

In other words, it seemed like a good idea at the time, but I am open
to suggestions.