linux-kernel - Re: [PATCH 2/2] aio: propogate post-EIOCBQUEUED errors to completion event

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Date:	Tue, 20 Feb 2007 10:26:44 -0800
From:	Zach Brown <zach.brown@...cle.com>
To:	"Ananiev, Leonid I" <leonid.i.ananiev@...el.com>
Cc:	<linux-aio@...ck.org>, <linux-kernel@...r.kernel.org>,
	"Benjamin LaHaise" <bcrl@...ck.org>,
	"Suparna bhattacharya" <suparna@...ibm.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/2] aio: propogate post-EIOCBQUEUED errors to completion event

On Feb 20, 2007, at 9:33 AM, Ananiev, Leonid I wrote:

> There is change in the patch which is uncommented in preface.
> Now aio_ring_insert_entry() is not called if req->ki_users>=1.
> Before was called.
> Could you comment it?

It is described in the patch description, though perhaps not  
explicitly enough:

"To get this working we change the aio_complete() path so that the ring
insertion is performed as the final iocb reference is dropped."

This stops an aio_complete() from generating a completion event  
before the submission path has had a chance to generate an error.   
This could happen if O_DIRECT bios completed very quickly before the  
submission path had a chance to return up and call  
ivalidate_inode_pages2_range().

- z

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