linux-kernel - Re: [PATCH block/for-4.5-fixes] writeback: keep superblock pinned during cgroup writeback association switches

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Message-ID: <20160218125724.GD6479@mtj.duckdns.org>
Date:	Thu, 18 Feb 2016 07:57:24 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Nikolay Borisov <kernel@...p.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Tahsin Erdogan <tahsin@...gle.com>,
	cgroups@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
	Nauman Rafique <nauman@...gle.com>,
	linux-kernel@...r.kernel.org, Jan Kara <jack@...e.com>
Subject: Re: [PATCH block/for-4.5-fixes] writeback: keep superblock pinned
 during cgroup writeback association switches

On Thu, Feb 18, 2016 at 12:12:40PM +0200, Nikolay Borisov wrote:
> 
> 
> On 02/16/2016 08:24 PM, Tejun Heo wrote:
> > Signed-off-by: Tejun Heo <tj@...nel.org>
> > Reported-and-tested-by: Tahsin Erdogan <tahsin@...gle.com>
> > Link: http://lkml.kernel.org/g/CAAeU0aNCq7LGODvVGRU-oU_o-6enii5ey0p1c26D1ZzYwkDc5A@mail.gmail.com
> > Fixes: d10c80955265 ("writeback: implement foreign cgroup inode bdi_writeback switching")
> > Cc: stable@...r.kernel.org #v4.5+
> 
> Why is this tagged for 4.5+ since the commit in question was merged in 4.2?

Up until 4.5, the whole cgroup v2 interface is hidden behind a devel
flag and cgroup writeback can only be used through cgroup v2.

Thanks.

-- 
tejun