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    SubjectRe: [PATCH] aio: propogate post-EIOCBQUEUED errors to completion event
    On Tue, Feb 20, 2007 at 05:06:47PM +0100, Arjan van de Ven wrote:
    > > We don't try to resolve "conflicting" writes between ordinary mmap() and
    > > write(), so why should we be doing it for mmap and O_DIRECT?
    > >
    > > mmap() is designed to violate the ordinary mutex locks for write(), so
    > > if a conflict arises, whether it be with O_DIRECT or ordinary writes
    > > then it is a case of "last writer wins".
    > but.. wouldn't an O_DIRECT *read* even cause this?

    The O_DIRECT read is fine because it doesn't leave bad data in the page
    cache. The point of doing invalidate_inode_pages2_range is to purge
    page cache data that has the old contents of the file before the
    O_DIRECT write.


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