From: Alasdair G Kergon <agk@redhat.com>
To: device-mapper development <dm-devel@redhat.com>
Cc: "Lukáš Czerner" <lczerner@redhat.com>,
linux-ext4@vger.kernel.org, xfs@oss.sgi.com,
Spelic <spelic@shiftmail.org>
Subject: Re: [dm-devel] Ext4 and xfs problems in dm-thin on allocation and discard
Date: Tue, 19 Jun 2012 17:03:01 +0100 [thread overview]
Message-ID: <20120619160300.GF14208@agk-dp.fab.redhat.com> (raw)
In-Reply-To: <20120619152856.GB7225@redhat.com>
On Tue, Jun 19, 2012 at 11:28:56AM -0400, Mike Snitzer wrote:
> That is an lvm2 BZ but there is further kernel work needed.
In principle, userspace should already be able to handle the replumbing I
think. (But when we work through the details of an online import, perhaps
we'll want some further kernel change for atomicity/speed reasons? In
particular we need to be able to do the last part of the metadata merge
quickly.)
Roughly:
1. rejig the lvm metadata for the new configuration [lvm]
- appends the "whole LV" data to the pool's data
2. Generate metadata for the appended data and append this to the metadata area [dmpd]
3. suspend all the affected devices [lvm]
4. link the already-prepared metadata into the existing metadata [dmpd]
5. resume all the devices (now using the new extended pool)
Alasdair
next prev parent reply other threads:[~2012-06-19 16:03 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-18 21:33 Ext4 and xfs problems in dm-thin on allocation and discard Spelic
2012-06-19 1:57 ` Dave Chinner
2012-06-19 3:12 ` Mike Snitzer
2012-06-19 6:32 ` Lukáš Czerner
2012-06-19 11:29 ` Spelic
2012-06-19 12:20 ` Lukáš Czerner
2012-06-19 13:34 ` Mike Snitzer
2012-06-19 13:16 ` Mike Snitzer
2012-06-19 13:25 ` Lukáš Czerner
2012-06-19 13:30 ` Mike Snitzer
2012-06-19 13:52 ` Spelic
2012-06-19 14:05 ` Eric Sandeen
2012-06-19 14:44 ` Mike Snitzer
2012-06-19 18:48 ` Mike Snitzer
2012-06-19 20:06 ` Dave Chinner
2012-06-19 20:21 ` Ted Ts'o
2012-06-19 20:39 ` Dave Chinner
2012-06-20 9:01 ` Christoph Hellwig
2012-06-19 21:37 ` Spelic
2012-06-19 23:12 ` Dave Chinner
2012-06-20 12:11 ` Spelic
2012-06-20 22:53 ` Dave Chinner
2012-06-21 17:47 ` Mike Snitzer
2012-06-21 23:29 ` Dave Chinner
2012-07-01 14:53 ` Paolo Bonzini
2012-07-02 13:00 ` Mike Snitzer
2012-07-02 13:15 ` Paolo Bonzini
2012-06-19 14:09 ` Lukáš Czerner
2012-06-19 14:19 ` Ted Ts'o
2012-06-19 14:23 ` Eric Sandeen
2012-06-19 14:37 ` Lukáš Czerner
2012-06-19 14:43 ` [dm-devel] " Alasdair G Kergon
2012-06-19 15:28 ` Mike Snitzer
2012-06-19 16:03 ` Alasdair G Kergon [this message]
2012-06-19 19:58 ` [dm-devel] " Ted Ts'o
2012-06-19 20:44 ` Mike Snitzer
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