Re: [dm-devel] do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target]

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To: Lukas Czerner <lczerner@redhat.com>
Subject: Re: [dm-devel] do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target]
From: "Martin K. Petersen" <martin.petersen@oracle.com>
Date: Mon, 02 May 2011 10:50:03 -0400
Cc: sandeen@redhat.com, "Martin K. Petersen" <martin.petersen@oracle.com>, Mike Snitzer <snitzer@redhat.com>, Christoph Hellwig <hch@infradead.org>, device-mapper development <dm-devel@redhat.com>, DarkNovaNick@gmail.com, linux-lvm@redhat.com, linux-ext4@vger.kernel.org, Alasdair G Kergon <agk@redhat.com>
In-reply-to: <alpine.LFD.2.00.1105021631590.3778@dhcp-27-109.brq.redhat.com> (Lukas Czerner's message of "Mon, 2 May 2011 16:39:31 +0200 (CEST)")
Organization: Oracle
References: <20110413224025.GA18589@redhat.com> <20110413234854.GA19793@redhat.com> <20110426173213.GA19604@redhat.com> <20110428001912.GA14659@redhat.com> <20110428075355.GA2190@infradead.org> <20110428205935.GA24979@redhat.com> <alpine.LFD.2.00.1104291117510.5496@dhcp-27-109.brq.redhat.com> <20110429122454.GL32370@agk-dp.fab.redhat.com> <alpine.LFD.2.00.1105020857030.3778@dhcp-27-109.brq.redhat.com> <20110502081308.GC8642@agk-dp.fab.redhat.com> <20110502081925.GA11312@infradead.org> <alpine.LFD.2.00.1105021217080.3778@dhcp-27-109.brq.redhat.com> <yq1bozl420p.fsf@sermon.lab.mkp.net> <alpine.LFD.2.00.1105021631590.3778@dhcp-27-109.brq.redhat.com>
Reply-to: LVM general discussion and development <linux-lvm@redhat.com>
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>>>>> "Lukas" == Lukas Czerner <lczerner@redhat.com> writes:

Lukas> So I assume it got fixes just recently ?. I'll give it a try with
Lukas> the up-to-date kernel.

Ok, turns out the SSD I used for the test predates advertising
TRIM. Beats me why this is broken for the zeroes/!zeroes case. I'll get
it fixed...

-- 
Martin K. Petersen	Oracle Linux Engineering
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References:
- [PATCH] dm snapshot: add discard support to the snapshot-origin target [was: Re: Testing TRIM with LVM]
  - From: Mike Snitzer
- Re: dm snapshot: add discard support to the snapshot-origin target [was: Re: Testing TRIM with LVM]
  - From: Mike Snitzer
- Re: dm snapshot: add discard support to the snapshot-origin target [was: Re: Testing TRIM with LVM]
  - From: Mike Snitzer
- [PATCH] dm snapshot: ignore discards issued to the snapshot-origin target
  - From: Mike Snitzer
- Re: [dm-devel] [PATCH] dm snapshot: ignore discards issued to the snapshot-origin target
  - From: Christoph Hellwig
- do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target]
  - From: Mike Snitzer
- Re: do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target]
  - From: Lukas Czerner
- Re: [dm-devel] do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target]
  - From: Alasdair G Kergon
- Re: [dm-devel] do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target]
  - From: Lukas Czerner
- Re: [dm-devel] do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target]
  - From: Alasdair G Kergon
- Re: [dm-devel] do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target]
  - From: Christoph Hellwig
- Re: [dm-devel] do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target]
  - From: Lukas Czerner
- Re: [dm-devel] do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target]
  - From: Martin K. Petersen
- Re: [dm-devel] do not disable ext4 discards on first discard failure? [was: Re: dm snapshot: ignore discards issued to the snapshot-origin target]
  - From: Lukas Czerner

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