From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jun'ichi Nomura" Subject: Re: [PATCH] block: restore multiple bd_link_disk_holder() support Date: Fri, 14 Jan 2011 16:31:57 +0900 Message-ID: <4D2FFBED.6010406@ce.jp.nec.com> References: <16069.1294853673@localhost> <4D2E4611.90002@redhat.com> <4D2E6129.8000700@ce.jp.nec.com> <20110113172133.GE14096@htj.dyndns.org> <4D2F4799.5030901@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4D2F4799.5030901@redhat.com> Sender: linux-raid-owner@vger.kernel.org To: Milan Broz , Tejun Heo Cc: Jens Axboe , Valdis.Kletnieks@vt.edu, Alexander Viro , Neil Brown , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-raid@vger.kernel.org, device-mapper development , Kay Sievers , Alasdair G Kergon List-Id: linux-raid.ids 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