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

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Message-ID: <CACVXFVM6YYW8N0wpKGchAVpLk72qJiqHwiUg4S4Yv+M+o-B=9g@mail.gmail.com>
Date:	Wed, 28 May 2014 09:34:41 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Jens Axboe <axboe@...nel.dk>
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 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>


Thanks,
-- 
Ming Lei
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