linux-kernel - Re: [PATCH 2/2] blkcg: don't offline parent blkcg first

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Date:   Wed, 1 Apr 2020 14:57:59 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Tejun Heo <tj@...nel.org>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH 2/2] blkcg: don't offline parent blkcg first

On 4/1/20 2:35 PM, Tejun Heo wrote:
> On Wed, Jul 24, 2019 at 10:37:55AM -0700, Tejun Heo wrote:
>> blkcg->cgwb_refcnt is used to delay blkcg offlining so that blkgs
>> don't get offlined while there are active cgwbs on them.  However, it
>> ends up making offlining unordered sometimes causing parents to be
>> offlined before children.
>>
>> Let's fix this by making child blkcgs pin the parents' online states.
>>
>> Note that pin/unpin names are chosen over get/put intentionally
>> because css uses get/put online for something different.
>>
>> Signed-off-by: Tejun Heo <tj@...nel.org>
> 
> Jens, these two patches slipped through the cracks. Can you please take a look
> at them?

Huh indeed, looks fine to me. I'll add for 5.7, thanks.

-- 
Jens Axboe