Messages in this thread |  | | | Date | Fri, 27 Sep 2002 12:25:50 -0700 | | From | Andrew Morton <> | | Subject | Re: [patch] 'virtual => physical page mappingcache',vcache-2.5.38-B8 |
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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.
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