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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This archive was generated by hypermail 2b29 : Mon Sep 30 2002 - 22:00:32 EST