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From: "yukuai (C)" <yukuai3@huawei.com>
To: Tejun Heo <tj@kernel.org>
Cc: <hch@infradead.org>, <axboe@kernel.dk>, <cgroups@vger.kernel.org>,
	<linux-block@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<yi.zhang@huawei.com>
Subject: Re: [PATCH v2 2/2] block: cancel all throttled bios in del_gendisk()
Date: Wed, 1 Dec 2021 17:26:17 +0800	[thread overview]
Message-ID: <a30bfafa-82ed-0ac1-deac-afb83f29c805@huawei.com> (raw)
In-Reply-To: <YaZQqjjygHGFEdbx@slm.duckdns.org>

在 2021/12/01 0:26, Tejun Heo 写道:
> Hello,
> 
> On Tue, Nov 30, 2021 at 09:17:30AM +0800, Yu Kuai wrote:
>> +void blk_throtl_cancel_bios(struct request_queue *q)
>> +{
>> +	struct throtl_data *td = q->td;
>> +	struct blkcg_gq *blkg;
>> +	struct cgroup_subsys_state *pos_css;
>> +	struct bio *bio;
>> +	int rw;
>> +
>> +	rcu_read_lock();
> 
> So, all of the draining is being performed without holding the q lock, which
> *might* be okay given that we're in the del_gendisk path but is likely risky
> - ie. there can still be timers or whatever racing against it.

I'll hold queue_lock to draining bios in next iteration,

Thanks,
Kuai
> 
> Thanks.
> 

      reply	other threads:[~2021-12-01  9:26 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-30  1:17 [PATCH v2 0/2] " Yu Kuai
2021-11-30  1:17 ` [PATCH v2 1/2] blk-throtl: move WARN_ON_ONCE() from throtl_rb_first() to it's caller Yu Kuai
2021-11-30  6:43   ` Christoph Hellwig
2021-11-30  1:17 ` [PATCH v2 2/2] block: cancel all throttled bios in del_gendisk() Yu Kuai
2021-11-30  6:43   ` Christoph Hellwig
2021-11-30 16:26   ` Tejun Heo
2021-12-01  9:26     ` yukuai (C) [this message]

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