From: Spelic <spelic@shiftmail.org>
To: "Lukáš Czerner" <lczerner@redhat.com>
Cc: Mike Snitzer <snitzer@redhat.com>,
Dave Chinner <david@fromorbit.com>, Spelic <spelic@shiftmail.org>,
device-mapper development <dm-devel@redhat.com>,
linux-ext4@vger.kernel.org, xfs@oss.sgi.com
Subject: Re: Ext4 and xfs problems in dm-thin on allocation and discard
Date: Tue, 19 Jun 2012 13:29:55 +0200 [thread overview]
Message-ID: <4FE062B3.7080702@shiftmail.org> (raw)
In-Reply-To: <alpine.LFD.2.00.1206190816440.2241@dhcp-1-248.brq.redhat.com>
On 06/19/12 08:32, Lukáš Czerner wrote:
>
> So do I understand correctly that even though the discard came
> through and thinp took advantage of it it still returns EOPNOTSUPP ?
> This seems rather suboptimal. IIRC there was a discussion to add an
> option to enable/disable sending discard in thinp target down
> to the device.
I'll ask this too...
do I understand correctly that dm-thin returns EOPNOTSUPP to the
filesystem layer even though it is using the discard to unmap blocks,
and at that point XFS stops sending discards down there (while ext4
keeps sending them)?
This looks like a bug of dm-thin to me. Discards are "supported" in such
a scenario.
Do you have a patch for dm-thin so to prevent it sending EOPTNOTSUPP ?
Thank you
S.
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next prev parent reply other threads:[~2012-06-19 11:30 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 [this message]
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 ` [dm-devel] " Alasdair G Kergon
2012-06-19 19:58 ` Ted Ts'o
2012-06-19 20:44 ` Mike Snitzer
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