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DragonFly kernel List (threaded) for 2006-01
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Re: a take at cache coherency


From: Csaba Henk <csaba.henk@xxxxxxx>
Date: 24 Jan 2006 00:30:59 GMT

On 2006-01-23, Simon 'corecode' Schubert <corecode@xxxxxxxxxxxx> wrote:
> + renames on the lower layer don't trigger namecache 
> renames/invalidations on a higher layer.  this is what the coherency 
> should be about, i think.

OK, it took some time, but now I got your point. You are damn right.
While invalidations do take effect in the higher layer as well (at
least, in nullfs), renames don't. It's easy to set up a scenario where
the upper layer goes async with a rename done in the lower one.

Csaba



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