new class / geom_cache / request for comments

[R. B. Riddick]

Hiho!

I just wrote a new(?) GEOM class:
  geom_cache

It is my very first GEOM class and my first larger kernel code...
I took it mostly from geom_concat... :-)
It was quite easy to change the behaviour of geom_concat...

The advantage of geom_cache is, that (even if we have a hard disc with a cache)
we can avoid reading the same area twice. I cared for segmentation of the cache
space a little bit by using a stripe size. The cache is always clean
(hopefully), so that it should not be dangerous to use geom_cache (if I did
everything right enough).

I attached a bzip'ed tar file although it is about 15KB large.

I would be glad,
1. if somebody tells me, what I did wrong (especially that license stuff and
the man page (I dont know man page language) might be wrong)
and
2. if somebody can use it.

I plan to use it for my next GEOM class (geom_raid5), where it might be useful
in case of sequential read from a degraded provider (or is there a smarter way
to do it?).

Bye
Arne


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