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

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Message-ID: <20070220002109.GG31205@kvack.org>
Date:	Mon, 19 Feb 2007 19:21:09 -0500
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	"Ananiev, Leonid I" <leonid.i.ananiev@...el.com>,
	Zach Brown <zach.brown@...cle.com>, linux-aio@...ck.org,
	linux-kernel@...r.kernel.org,
	Suparna bhattacharya <suparna@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] aio: propogate post-EIOCBQUEUED errors to completion event

On Mon, Feb 19, 2007 at 04:50:48PM -0500, Chris Mason wrote:
> aio is not responsible for this particular synchronization.  Those fixes
> (if we make them) should come from other places.  The patch is important
> to get aio error handling right.
> 
> I would argue that one common cause of the EIO is userland
> error (mmap concurrent with O_DIRECT), and EIO is the correct answer.

I disagree.  That means that using the pagecache to synchronize things like 
the proposed online defragmentation will occasionally make O_DIRECT users 
fail.  O_DIRECT doesn't prevent the sysadmin from copying files or other 
page cache uses, which implies that generating an error in these cases is 
horrifically broken.  If only root could do it, I wouldn't complain, but 
this would seem to imply that user vs root holes still exist.

		-ben
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