Thu Apr 18 00:08:00 CEST 2002 ide-clean-40

This applies on top of 2.5.8, all patches up to IDE 39 + the laters ide-update
for 2.5.8. from Jens Axboe.

- Make the ide-cd driver usable again in DMA mode by adapting it to the TCQ
   related request handling changes and fixing some other minor stuff related to
   this. This patch is ugly like hell I know. Cleanup will follow separately.
   It was hard enough to make this going agian at all.