Re: silent semantic changes with reiser4

Pavel Machek
2004-08-31T20:54:23Z

Hi!

> > It buys me caching.
>
> I'll actually buy into that. If only because I consider caching to be one
> of the more important things that the kernel does (caches are a _classic_
> case of "shared data that needs synchronization").
>
> However, that said, user space can trivially cache things in the
> filesystem, so while this may be a convenient feature, I think you should
> look at perhaps doing it in the _shell_ instead..

That cache should disappear as soon as I need disk
space. I.e. userspace should never see -ENOSPC because of this kind of
caching. This need some kernel support. Ouch and cached file should
atomically go away as soon as main file changes, otherwise I do not
see how multiple processes could cooperate on caching...

chattr +kill-this-file-when-low-on-disk-space patch.bz2...ubz

would solve first problem. Not sure how to do the second one.

Pavel
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