linux-ext4 - 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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Message-ID: <20110504163317.GA17529@thunk.org>
Date:	Wed, 4 May 2011 12:33:17 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Lukas Czerner <lczerner@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
	DarkNovaNick@...il.com, linux-lvm@...hat.com,
	linux-ext4@...r.kernel.org
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]

On Fri, Apr 29, 2011 at 09:28:51AM -0500, Eric Sandeen wrote:
> On 4/29/11 7:29 AM, Christoph Hellwig wrote:
> > FYI, that disable discard on failure seems to be an ext4 special and no
> > one else picked up that stupid idea.  If ext4 wants to misbehave for
> > that just let them..
> 
> It was my "stupid idea," and I'm ok with reverting it ;)

I think I forgot to send the patch out, but it's been reverted in the
ext4 master branch, commit id: d9f34504e695.  It's more than a revert,
actually, since I also dropped error checking for FITRIM.  Otherwise
an attempt to use FITRIM would stop after hitting the first dm region
that didn't support discards.

						- Ted
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