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SubjectRe: [patch] 'virtual => physical page mappingcache',vcache-2.5.38-B8
Alan Cox wrote:
>
> On Fri, 2002-09-27 at 19:35, Andrew Morton wrote:
> > O_DIRECT writes operate under i_sem, which provides exclusion
> > from trucate. Do you know something which I don't??
>
> So it does, hidden away in generic_file_write rather than the lower
> layers.

Well that's sort of the same level at which truncate takes it.
It's a pretty big lock.

> Interesting. So now I have a new question to resolve, which is
> why doing O_DIRECT and truncate together corrupted my disk when I tried
> it trying to break stuff

Interesting indeed. Possibly invalidate_inode_pages2() accidentally
left some dirty buffers detached from the mapping. Hard to see how
it could do that.

What kernel were you testing?
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