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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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