linux-kernel - Re: [PATCH 1/5] aio: Export symbols and struct kiocb

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Date:	Fri, 13 Jul 2012 09:40:03 +0800
From:	Asias He <asias@...hat.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	Benjamin LaHaise <bcrl@...ck.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Michael S. Tsirkin" <mst@...hat.com>, linux-aio@...ck.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/5] aio: Export symbols and struct kiocb_batch for in
 kernel aio usage

Hi James,

On 07/13/2012 01:50 AM, James Bottomley wrote:
> On Thu, 2012-07-12 at 23:35 +0800, Asias He wrote:
>> This is useful for people who want to use aio in kernel, e.g. vhost-blk.
>>
>> Signed-off-by: Asias He <asias@...hat.com>
>> ---
>>   fs/aio.c            |   37 ++++++++++++++++++-------------------
>>   include/linux/aio.h |   21 +++++++++++++++++++++
>>   2 files changed, 39 insertions(+), 19 deletions(-)
>
> Um, I think you don't quite understand how aio in the kernel would work;
> it's not as simple as just exporting the interfaces.  There's already a
> (very long) patch set from oracle to do this so loop can use aio:
>
> http://marc.info/?l=linux-fsdevel&m=133312234313122

Oh, I did not see this patch set. Thanks for pointing it out! This bit 
hasn't merged, right? I'd love to use the aio_kernel_() interface if it 
is merged. It will simply vhost-blk. Due to lack of better kernel aio 
interface, we are currently doing io_setup, io_submit, etc. in vhost-blk 
on our own.

-- 
Asias


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