linux-ext4 - Re: Random corruption test for e2fsck

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Message-ID: <p73myy3x8z0.fsf@bingen.suse.de>
Date:	11 Jul 2007 17:20:51 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Kalpak Shah <kalpak@...sterfs.com>
Cc:	linux-ext4 <linux-ext4@...r.kernel.org>,
	TheodoreTso <tytso@....edu>
Subject: Re: Random corruption test for e2fsck

Kalpak Shah <kalpak@...sterfs.com> writes:

> regression tests. It does the following:
> 1) Create an test fs and format it with ext2/3/4 and random selection of
> features.
> 2) Mount it and copy data into it.
> 3) Move around the blocks of the filesystem randomly causing corruption.
> Also overwrite some random blocks with garbage from /dev/urandom. Create
> a copy of this corrupted filesystem.

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.

-Andi
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