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Message-ID: <20070712051938.GD5586@schatzie.adilger.int>
Date:	Wed, 11 Jul 2007 23:19:38 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Kalpak Shah <kalpak@...sterfs.com>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	TheodoreTso <tytso@....edu>
Subject: Re: Random corruption test for e2fsck

On Jul 11, 2007  17:20 +0200, Andi Kleen wrote:
> If you use a normal pseudo random number generator and print the seed
> (e.g. create from the time) initially the image can be easily recreated 
> later without shipping it around. /dev/urandom
> is not really needed for this since you don't need cryptographic
> strength randomness. Besides urandom data is precious and it's 
> a pity to use it up needlessly.
> 
> bash has $RANDOM built in for this purpose.

Except it is a lot more efficient and easy to do
"dd if=/dev/urandom bs=1k ..." than to spin in a loop getting 16-bit
random numbers from bash.  We would also be at the mercy of the shell
being identical on the user and debugger's systems.

I don't think that running this test once in a blue moon on some
system is going to be a source of problems.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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