From: Alasdair G Kergon <agk@redhat.com>
To: device-mapper development <dm-devel@redhat.com>
Cc: sandeen@redhat.com, Mike Snitzer <snitzer@redhat.com>,
Christoph Hellwig <hch@infradead.org>,
DarkNovaNick@gmail.com, linux-lvm@redhat.com,
Lukas Czerner <lczerner@redhat.com>,
linux-ext4@vger.kernel.org, Alasdair G Kergon <agk@redhat.com>
Subject: Re: [linux-lvm] [dm-devel] do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target]
Date: Mon, 2 May 2011 09:13:08 +0100 [thread overview]
Message-ID: <20110502081308.GC8642@agk-dp.fab.redhat.com> (raw)
In-Reply-To: <alpine.LFD.2.00.1105020857030.3778@dhcp-27-109.brq.redhat.com>
On Mon, May 02, 2011 at 09:16:21AM +0200, Lukas Czerner wrote:
> However when we have dm device where part of the device supports
> discard due to underlying hardware capability we just can not return
> EOPNOTSUPP from blkdev_issue_discard, because it is just not true!
EOPNOTSUPP from dm means the operation was not supported on that *one* bio.
It does *not* tell you anything in general about the device, or whether
you'd get the same error from different bios in future.
Alasdair
next prev parent reply other threads:[~2011-05-02 8:13 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-12 14:59 [linux-lvm] Testing TRIM with LVM DarkNovaNick
2011-04-12 23:47 ` Mike Snitzer
2011-04-13 1:47 ` DarkNovaNick
2011-04-13 8:41 ` Zdenek Kabelac
2011-04-13 15:38 ` DarkNovaNick
2011-04-13 22:40 ` [linux-lvm] [PATCH] dm snapshot: add discard support to the snapshot-origin target [was: Re: Testing TRIM with LVM] Mike Snitzer
2011-04-13 23:48 ` [linux-lvm] " Mike Snitzer
2011-04-26 17:32 ` Mike Snitzer
2011-04-28 0:19 ` [linux-lvm] [PATCH] dm snapshot: ignore discards issued to the snapshot-origin target Mike Snitzer
2011-04-28 7:53 ` [linux-lvm] [dm-devel] " Christoph Hellwig
2011-04-28 20:59 ` [linux-lvm] do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target] Mike Snitzer
2011-04-28 21:28 ` Eric Sandeen
2011-04-28 22:59 ` Alasdair G Kergon
2011-04-28 23:01 ` Eric Sandeen
2011-04-28 23:11 ` Alasdair G Kergon
2011-04-29 1:12 ` Andreas Dilger
2011-04-29 13:55 ` Mike Snitzer
2011-04-29 9:30 ` Lukas Czerner
2011-04-29 12:24 ` [linux-lvm] [dm-devel] " Alasdair G Kergon
2011-04-29 12:29 ` Christoph Hellwig
2011-04-29 14:28 ` Eric Sandeen
2011-04-29 15:13 ` Ray Morris
2011-05-04 16:33 ` Ted Ts'o
2011-05-04 17:02 ` Lukas Czerner
2011-05-02 7:16 ` Lukas Czerner
2011-05-02 8:13 ` Alasdair G Kergon [this message]
2011-05-02 8:19 ` Christoph Hellwig
2011-05-02 10:24 ` Lukas Czerner
2011-05-02 12:48 ` [linux-lvm] " Mike Snitzer
2011-05-02 13:05 ` Lukas Czerner
2011-05-02 14:47 ` Eric Sandeen
2011-05-02 14:48 ` Christoph Hellwig
2011-05-02 14:58 ` Lukas Czerner
2011-05-02 13:48 ` [linux-lvm] [dm-devel] " Martin K. Petersen
2011-05-02 14:20 ` Martin K. Petersen
2011-05-02 14:39 ` Lukas Czerner
2011-05-02 14:50 ` Martin K. Petersen
2011-05-02 14:58 ` [linux-lvm] " Mike Snitzer
2011-05-02 16:58 ` [linux-lvm] [dm-devel] " Martin K. Petersen
2011-05-03 8:57 ` Lukas Czerner
2011-05-04 15:10 ` Martin K. Petersen
2011-05-04 16:02 ` [linux-lvm] " Mike Snitzer
2011-05-04 16:50 ` Martin K. Petersen
2011-05-04 18:03 ` Mike Snitzer
2011-05-04 17:10 ` [linux-lvm] [dm-devel] " Lukas Czerner
2011-05-04 17:32 ` Martin K. Petersen
2011-05-04 17:35 ` Lukas Czerner
2011-05-18 12:16 ` [linux-lvm] " Mike Snitzer
2011-05-18 12:52 ` Mike Snitzer
2011-05-04 15:16 ` [linux-lvm] [dm-devel] " Martin K. Petersen
2011-05-04 16:12 ` Lukas Czerner
2011-05-05 8:33 ` Karel Zak
2011-05-05 10:48 ` Lukas Czerner
2011-04-14 15:31 ` [linux-lvm] [PATCH] dm snapshot: add discard support to the snapshot-origin target [was: Re: Testing TRIM wi DarkNovaNick
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