Re: [PATCH] aio: propogate post-EIOCBQUEUED errors to completion event

From: Benjamin LaHaise
Date: Tue Feb 20 2007 - 11:06:58 EST

On Tue, Feb 20, 2007 at 11:01:50AM -0500, Trond Myklebust 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?

Yes we do -- both writes will succeed. More importantly, if one modifies
the first 512 bytes of a page and the other modifies the last 512 bytes of
the page, both writes will show up in the completed result. This is not the
case with the -EIO bailout.

> 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".

Except that we're not handling cases like the one mentioned above, which
is quite broken.

"Time is of no importance, Mr. President, only life is important."
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