linux-kernel - Re: Zero-clearing all zero-clearable bytes.

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Message-Id: <200811230915.CII90122.SFtOMFQHOVLOFJ@I-love.SAKURA.ne.jp>
Date:	Sun, 23 Nov 2008 09:15:56 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	adilger@....com
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Zero-clearing all zero-clearable bytes.

Hello.

Andreas Dilger wrote:
> Why would you fill the buffer with 0xff instead of 0?
> In fact no such program is needed, just "dd if=/dev/zero of=/{fs}/tmp"
> and then delete the file.
> 
To avoid that the /{fs}/tmp is created as a sparse file.

I want to clear not only not-in-use blocks but also in-use blocks,
while keeping files in /{fs}/tmp intact.

Regards.
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