linux-ext4 - Re: [linux-lvm] 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: <20110428231108.GK32370@agk-dp.fab.redhat.com>
Date:	Fri, 29 Apr 2011 00:11:08 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	LVM general discussion and development <linux-lvm@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>,
	Christoph Hellwig <hch@...radead.org>, dm-devel@...hat.com,
	linux-ext4@...r.kernel.org, DarkNovaNick@...il.com
Subject: Re: [linux-lvm] do not disable ext4 discards on first discard
	failure? [was: Re: dm snapshot: ignore discards issued to the
	snapshot-origin target]

On Thu, Apr 28, 2011 at 06:01:18PM -0500, Eric Sandeen wrote:
> If you are saying that a target should return EOPNOTSUPP when it does not support the operation, then we are in violent agreement.   :)
 
Naturally, with the definition you used in the first post.
(I.e. if the target does *anything* with it, you do not get that error, even
if it did not process it completely.)

Alasdair

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