How to bypass buffer caches?

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Hi,

I've sent some messages about using O_DIRECT to read files, but I
suppose that is not possible using 2.4 kernel and ext2. So I was
wondering which other alternatives I have to bypass the buffer cache of
the kernel. One option would be create a raw device on top of my disk
partition, but in this case I would have to learn how to map a logical
file name (/var/tmp/myfile) to a set of block disks. Is there any other
solution? Can I disable buffer caches or at least limit their memory
utilization?

Thanks,

Bruno.

-- 
Bruno Diniz de Paula <diniz@cs.rutgers.edu>
Rutgers University

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