linux-ext4 - Re: [PATCH 4/4] e2fsck: Do not discard itable if discard doen't zero data

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Message-ID: <20120311193930.GG1048@thunk.org>
Date:	Sun, 11 Mar 2012 15:39:30 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	linux-ext4@...r.kernel.org, sandeen@...hat.com
Subject: Re: [PATCH 4/4] e2fsck: Do not discard itable if discard doen't
 zero data

On Mon, Mar 05, 2012 at 08:49:36AM +0100, Lukas Czerner wrote:
> We do not want to discard inode table if the underlying device does not
> return zeros when reading non-provisioned blocks. The reason is that if
> the inode table is not zeroed yet, then discard would not help us since
> we would have to zero it anyway. In the case that inode table was
> already zeroed, then the discard would cause subsequent reads to contain
> non-deterministic data so we would not be able to assume that the inode
> table was zeroed and we would need to zero it again, which does not
> really make sense.
> 
> This commit adds check to prevent inode table from being discarded if
> the discard does not zero data.
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>

Applied, thanks.

				- Ted
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