linux-kernel - Re: [PATCH UPDATED] block: restore multiple bd_link_disk

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Message-ID: <4D30BB78.5020101@redhat.com>
Date:	Fri, 14 Jan 2011 22:09:12 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	Tejun Heo <tj@...nel.org>
CC:	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>,
	Jens Axboe <axboe@...nel.dk>, Valdis.Kletnieks@...edu,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-raid@...r.kernel.org,
	device-mapper development <dm-devel@...hat.com>,
	Kay Sievers <kay.sievers@...y.org>,
	Alasdair G Kergon <agk@...hat.com>
Subject: Re: [PATCH UPDATED] block: restore multiple bd_link_disk_holder()
 support

On 01/14/2011 05:10 PM, Tejun Heo wrote:
> Commit e09b457b (block: simplify holder symlink handling) incorrectly
> assumed that there is only one link at maximum.  dm may use multiple
> links and expects block layer to track reference count for each link,
> which is different from and unrelated to the exclusive device holder
> identified by @holder when the device is opened.
> 
> Remove the single holder assumption and automatic removal of the link
> and revive the per-link reference count tracking.  The code
> essentially behaves the same as before commit e09b457b sans the
> unnecessary kobject reference count dancing.
> 
> While at it, note that this facility should not be used by anyone else
> than the current ones.  Sysfs symlinks shouldn't be abused like this
> and the whole thing doesn't belong in the block layer at all.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Reported-by: Milan Broz <mbroz@...hat.com>
> Cc: Jun'ichi Nomura <j-nomura@...jp.nec.com>
> Cc: Neil Brown <neilb@...e.de>
> Cc: linux-raid@...r.kernel.org
> Cc: Kay Sievers <kay.sievers@...y.org>
> ---
> Thanks for the test commands.  They were very helpful.  Can you please
> test this one?

Hi,

yes, this one works for me. I run full lvm2 testsuite and no warnings.
Thanks!

Tested-by: Milan Broz <mbroz@...hat.com>

Milan
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