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

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Message-ID: <20200401203551.GV162390@mtj.duckdns.org>
Date:   Wed, 1 Apr 2020 16:35:51 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Jens Axboe <axboe@...nel.dk>
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 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?

Thanks.

-- 
tejun