linux-kernel - Re: [PATCH] block: mq flush: fix race between IPI handler and mq flush worker

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Date:	Tue, 27 May 2014 20:26:22 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Ming Lei <tom.leiming@...il.com>
CC:	Christoph Hellwig <hch@....de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	stable <stable@...r.kernel.org>
Subject: Re: [PATCH] block: mq flush: fix race between IPI handler and mq
 flush worker

On 2014-05-27 19:34, Ming Lei wrote:
> On Wed, May 28, 2014 at 3:35 AM, Jens Axboe <axboe@...nel.dk> wrote:
>> On 05/27/2014 01:21 PM, Christoph Hellwig wrote:
>>> On Tue, May 27, 2014 at 01:17:40PM -0600, Jens Axboe wrote:
>>>> But I think you sent the old one again, not the new variant :-)
>>>
>>> Oh well, next try:
>>
>> This looks good to me. Was trying to think of ways to reduce that to one
>> list iteration, but I think it's cleaner to just retain the two separate
>> ones.
>>
>> Reusing REQ_SOFTBARRIER is fine as well, not used in blk-mq otherwise.
>>
>> Let me know when you have runtime verified it.
>
> Looks writing over ext4(especially sync writing) can survive
> with Christoph's patch now, thanks Christoph.
>
> Reported-and-tested-by: Ming Lei <tom.leiming@...il.com>

Great! I'll queue it up here too, then.

-- 
Jens Axboe

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