fake data io module for samba

[Peter Somogyi]

> With 0-sized files I'd have the fear of changing testcases themselves, 
> though I have no evidence. Now filesizes are accurate.

More precisely: specsfs fails with 0-sized files - while storing real 
newlen in smbd, I've just tried it (and remembered failing in the past 
too).
Means that sparse files support is really needed.

--
Peter Somogyi
IBM Magyarországi Kft.
1117 Budapest
Infopark, Neumann János u. 1.
Hungary
Phone: +36 1 382 5469