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Re: [PATCH] mkfs: add discard support

To: xfs@xxxxxxxxxxx
Subject: Re: [PATCH] mkfs: add discard support
From: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 7 Oct 2009 08:05:46 +0200
In-reply-to: <20091007044215.GK9464@xxxxxxxxxxxxxxxx>
Organization: it-management http://it-management.at
References: <20091006184758.GA4780@xxxxxxxxxxxxx> <20091007044215.GK9464@xxxxxxxxxxxxxxxx>
User-agent: KMail/1.10.3 (Linux/2.6.30.5-ZMI; KDE/4.1.3; x86_64; ; )
On Mittwoch 07 Oktober 2009 Dave Chinner wrote:
> Good idea, but perhaps the discard should be optional rather than
> unconditional.  My immediate thought was the SOP for setting up
> encrypted devices - fill the empty disk with random data before
> setting up the encrypted device. If you then send it a discard....

You could change the order to
mkfs ; mount
dd if=/dev/urandom of=/encrytped/fill.dd
(one day the disk will be full)
sync ; rm /encrytped/fill.dd

That should fill the disk with random garbage too. Should be nearly the 
same result, right?

mfg zmi
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