Devfs tries to be super smart and rereads partition tables at all
kinds of wierd points.  This breaks a bunch of stuff were you
can't get the right disk changed information (i.e. CompactFlash).

If people actually need this kind of stuff they should just call partx
from devfsd instead of relying on the kernel doing something like this.

Cleans up the devfs code significatnly (aka removes tons of junk)

Not use anywhere else nor should it.

Adrian Bunk noticed that there's an exposed config option to use the
now gone DEVFS_FL_AUTO_DEVNUM in the dvb code - remove it.

devfs_d_revalidate_wait adds to a waitqueue but never removes from it
again so we there's one entry full of reused stack space added on
each call (I wonder how this ever worked).

The function has a few more bugs (it effectivly does a sleep_on instead
of checking for the actual even and can't deal with negative dentries
at all), but I just had breakfast and don't want to poke into devfs
internals deeper - I still hope Adam's smalldevfs will get merged
anyway..

fix yet another manual reschedule point

into home.transmeta.com:/home/torvalds/v2.5/linux

Also add abort functionality

- New style ide-default driver
- Don't attach non existant drives
- DRIVER()==NULL checks can go
- Ioctl checks that were missing are now in

This isnt perfect, there is a race left somewhere still but its closer.

Make drive->id not NULL an invariant
Clean up a few things from that
hwif specific queue length
initialisation/IRQ cleanups

Note: this changes the default blocks limit per I/O to 256. I've still seen
no credible evidence that its a problem and "other OS's" do it.

This is the first of a set of changes to make DRIVER(drive)!=NULL an
invariant

Yes NEC use *different* function numbers!!