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

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Date:	Thu, 13 Jan 2011 15:25:46 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	Tejun Heo <tj@...nel.org>
CC:	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, Kay Sievers <kay.sievers@...y.org>
Subject: Re: [dm-devel] linux-next - WARNING: at fs/block_dev.c:824 bd_link_disk_holder+0x92/0x1ac()

On 01/13/2011 03:11 PM, Tejun Heo wrote:

> So, as a general rule, when in doubt, just create an attribute.  Let's
> refrain from custom symlinkery in sysfs, please.  In this case too, a
> holder attribute containing strings like ext[3|4], md, dm or whatnot
> would have been _much_ simpler and actually more useful.

Maybe, but this was not invented in DM/MD camp:-)
Probably Kay or Greg can answer why it was done this way?

For DM it just added links to be proper user of it, see
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=f165921df46a977e3561f1bd9f13a348441486d1

Anyway, it is /sys/block - so it represents block devices.

If btrfs internally creates some virtual _block_ device for its pool, it should
present it here too with slaves/holders. If not, why it should create any links there?

Milan
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