2.2.x->2.4.x API Changes (superblock.notify_change()...)

Hi -

I've been away for a little while, but now that I've upgraded from kernel
2.2 to 2.4, I'm trying to port some modules that I use, without much luck
as a fair amount of stuff has changed!

Some functions/structure members that I'm currently drawing a blank when
looking for equivalents in 2.4 are:

superblock.notify_change
  (*is* there an equivalent any more?)

namei()/__namei()
  (arrrgh! there were one or two vfs changes in 2.4, weren't there?! :)

start_bh_atomic()/end_bh_atomic()

Can anyone give me equivalents for these under 2.4, or better, a pointer to
a page (or pages :) that describes the API changes in depth?

That's about all for now as it's hard to work out what's causing the rest of
the errors... :)

Cheers,
Alex.