frequent cache corruption with arla 0.21 on linux 2.2.1

[Magnus Ahltorp]

> 1) Trying to read a file larger than arla's cache fails.

This will not work, since arla always fetches whole files.

> 3) sometimes (rarely) when doing something like a make -j 4
>    make will fail, complaining about a file on an arla
>    filesystem that it thinks is missing but which is
>    really there.  Restaring make "fixes" the problem.

We have noticed this problem. It is, however, (normally) a problem
with make and it's inability to parallelize compilations with complex
dependencies.

/Magnus
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