From: David Teigland <teigland@redhat.com>
To: Vladislav Bogdanov <bubble@hoster-ok.com>
Cc: linux-lvm@redhat.com
Subject: Re: [linux-lvm] [PATCH 01/10] lvchange: Allow cluster lock conversion
Date: Tue, 19 Mar 2013 11:23:47 -0400 [thread overview]
Message-ID: <20130319152347.GA986@redhat.com> (raw)
In-Reply-To: <1363699970-10002-2-git-send-email-bubble@hoster-ok.com>
On Tue, Mar 19, 2013 at 01:32:41PM +0000, Vladislav Bogdanov wrote:
> Allow clvm locks to be converted shared <-> exclusive with corosync/dlm.
>
> Without this it is impossible to alow both
> * VM migration (shared lock is required)
> * host-side snapshots of VM disks (exlusive lock is required)
>
> Locks are only converted if --force parameter passed to lvchange.
>
> Internally LKF_CONVERT flag is passed to dlm, so that is a real lock
> conversion.
>
> Also deny release of an exclusive lock on a remote note without --force
> flag to lvchange -an.
I'm trying to figure out why the code doesn't already use CONVERT when
possible; I would have expected it to. (It has to be combined with
NOQUEUE to avoid deadlocks.) What happens now without this force/CONVERT
patch? a new lock created/requested?
next prev parent reply other threads:[~2013-03-19 15:23 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-19 13:32 [linux-lvm] [PATCH 00/10] Enhancements to a clustered logical volume activation Vladislav Bogdanov
2013-03-19 13:32 ` [linux-lvm] [PATCH 01/10] lvchange: Allow cluster lock conversion Vladislav Bogdanov
2013-03-19 15:23 ` David Teigland [this message]
2013-03-19 15:33 ` Vladislav Bogdanov
2013-03-19 15:44 ` Vladislav Bogdanov
2013-03-19 16:03 ` David Teigland
2013-03-19 16:36 ` Vladislav Bogdanov
2013-03-19 13:32 ` [linux-lvm] [PATCH 02/10] clvmd: Fix buffer size Vladislav Bogdanov
2013-03-19 13:32 ` [linux-lvm] [PATCH 03/10] clvmd: Allow node names to be obtained from corosync's CMAP Vladislav Bogdanov
2013-03-19 13:32 ` [linux-lvm] [PATCH 04/10] clvmd: fix positive return value is not an error in csid->name translation Vladislav Bogdanov
2013-03-19 13:32 ` [linux-lvm] [PATCH 05/10] clvmd: use correct flags for local command execution Vladislav Bogdanov
2013-03-19 13:32 ` [linux-lvm] [PATCH 06/10] clvmd: additional debugging - print message bodies Vladislav Bogdanov
2013-03-19 13:32 ` [linux-lvm] [PATCH 07/10] locking: Allow lock management (activation, deactivation, conversion) on a remote nodes Vladislav Bogdanov
2013-03-19 13:32 ` [linux-lvm] [PATCH 08/10] lvchange: implement remote lock management Vladislav Bogdanov
2013-03-19 13:32 ` [linux-lvm] [PATCH 09/10] man: document --force option to lvchange, provide examples Vladislav Bogdanov
2013-03-19 13:32 ` [linux-lvm] [PATCH 10/10] man: document --node option to lvchange Vladislav Bogdanov
2013-03-19 15:32 ` David Teigland
2013-03-19 15:42 ` Vladislav Bogdanov
2013-03-19 15:54 ` David Teigland
2013-03-19 16:52 ` Vladislav Bogdanov
2013-03-19 17:16 ` David Teigland
2013-03-19 17:36 ` Vladislav Bogdanov
2013-03-20 8:45 ` Zdenek Kabelac
2013-03-20 12:12 ` Vladislav Bogdanov
2013-03-21 18:31 ` Vladislav Bogdanov
2013-03-21 19:01 ` Zdenek Kabelac
2013-03-21 19:16 ` Vladislav Bogdanov
2013-03-21 18:23 ` Vladislav Bogdanov
2013-03-19 16:42 ` [linux-lvm] [PATCH 00/10] Enhancements to a clustered logical volume activation Alasdair G Kergon
2013-03-19 17:42 ` Vladislav Bogdanov
2013-06-05 13:23 ` [linux-lvm] clvmd leaving kernel dlm uncontrolled lockspace Andreas Pflug
2013-06-05 15:13 ` David Teigland
2013-06-05 17:29 ` Andreas Pflug
2013-06-06 6:17 ` Andreas Pflug
2013-06-06 11:06 ` matthew patton
2013-06-06 17:54 ` Andreas Pflug
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