This is a patch to fix some problems in the OnStream tape drive support
in ide-tape.c.

- It implements Early Warning (e.g. retuns ENOSPC) for reaching end-of-tape. 
  This fixes a real nasty problem when writing beyond end-of-tape, rendering
  the 'backup' more ore less useless.
- Includes a workaround for a read error around block 3000.
- The module use counts were gone allowing to remove the module while it was
  still busy.
- Support for other IDE OnStream tape drives (e.g. DI-50).
- A few cosmetic fixes to improve readability.

The 2.4 patch is against linux 2.4.0-prerelease but should work up till at least 2.4.2.
The 2.2.18 patch is against linux 2.2.18 with the 1209 patch from Andre Hedrick applied.

-Marcel
-- 
     ======--------         Marcel J.E. Mol                MESA Consulting B.V.
    =======---------        ph. +31-(0)6-54724868          P.O. Box 112
    =======---------        marcel@mesa.nl                 2630 AC  Nootdorp
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