linux-kernel - Re: [dm-devel] linux-next - WARNING: at fs/block_dev.c:824 bd_link_disk

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Message-ID: <4D2FFD5D.9070709@ce.jp.nec.com>
Date:	Fri, 14 Jan 2011 16:38:05 +0900
From:	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>
To:	Milan Broz <mbroz@...hat.com>, Kay Sievers <kay.sievers@...y.org>,
	Tejun Heo <tj@...nel.org>
CC:	Karel Zak <kzak@...hat.com>,
	device-mapper development <dm-devel@...hat.com>,
	Valdis.Kletnieks@...edu, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [dm-devel] linux-next - WARNING: at fs/block_dev.c:824 bd_link_disk_holder+0x92/0x1ac()

On 01/14/11 00:03, Milan Broz wrote:
> On 01/13/2011 03:43 PM, Kay Sievers wrote:
> 
>>> On Thu, Jan 13, 2011 at 3:25 PM, Milan Broz <mbroz@...hat.com> wrote:
>>>> Maybe, but this was not invented in DM/MD camp:-)
>>>> Probably Kay or Greg can answer why it was done this way?
>>
>> It's not from Greg or Kay. It just appeared some day in the context of dm. :)
> 
> ah, then sorry, I am just confused:-)
> But DM does not need it for operation at all so it must had some other reason.
> (We have dmsetup ls --tree using dm-ioctls for years.)

Sorry. It's from me 5 years ago. :)

See this for backgrounds:
  [PATCH 0/3] sysfs representation of stacked devices (dm/md)
  http://lwn.net/Articles/172689/

And I don't adhere to my implementation if there's better one.

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation
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