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

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Date:	Fri, 14 Jan 2011 16:31:57 +0900
From:	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>
To:	Milan Broz <mbroz@...hat.com>, Tejun Heo <tj@...nel.org>
CC:	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] block: restore multiple bd_link_disk_holder() support

Hi,

On 01/14/11 03:42, Milan Broz wrote:
>> Milan, Jun, can you guys please verify this works correctly for the
>> multi holder dm case?  Thank you.
> 
> Hi,
> 
> unfortunately not. And the problem is much worse,
> it breaks lvm resize operation completely.

For quick testing, try this:
("/dev/sdf" can be other block device.
 "testA" and "testB" can be other dm names which aren't used in
 your machine.)

# echo "0 10 linear /dev/sdf 0" | dmsetup create testA
# echo "0 10 linear /dev/sdf 10" | dmsetup create testB
(at this point, /dev/sdf has multiple holders)
# echo "0 20 linear /dev/sdf 10" | dmsetup load testB
(at this point, /dev/mapper/testB has 2 claims on /dev/sdf)
# dmsetup resume testB
(/dev/mapper/testB has 1 claim on /dev/sdf)
# dmsetup remove testA
# dmsetup remove testB


Thanks,
-- 
Jun'ichi Nomura, NEC Corporation
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