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

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Message-ID: <4D2F1430.50906@redhat.com>
Date:	Thu, 13 Jan 2011 16:03:12 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	Kay Sievers <kay.sievers@...y.org>
CC:	Tejun Heo <tj@...nel.org>, Karel Zak <kzak@...hat.com>,
	device-mapper development <dm-devel@...hat.com>,
	"Jun'ichi Nomura" <j-nomura@...jp.nec.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 01/13/2011 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.)

> And yes, symlinks *look* nice and simple for the outside, but they are
> not, and have all sorts of problems like non-atomic updates, make it
> impossible to ever rename a device (as long as they copy the device
> name), and and and .... we should not add more of this.

Yes, I agree, if there is better way, let's switch to that.

Milan
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