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.
-chris
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