linux-kernel - [BUG] garbage instead of zeroes in UFS

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Message-ID: <5157576d0612200302j556694bfsfdc6cb0c37b054c@mail.gmail.com>
Date:	Wed, 20 Dec 2006 14:02:15 +0300
From:	"Tomasz Kvarsin" <kvarsin@...il.com>
To:	"Andrew Morton" <akpm@...l.org>,
	"Alexander Viro" <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: [BUG] garbage instead of zeroes in UFS

I have some problems with write support of UFS.
Here is script which demonstrate problem:

#create image
mkdir /tmp/ufs-expirements && cd /tmp/ufs-expirements/
for ((i=0; i<1024*1024*2; ++i)); do printf "z"; done > image

#build ufs tools
wget 'http://heanet.dl.sourceforge.net/sourceforge/ufs-linux/ufs-tools-0.1.tar.bz2'
&& tar xjf ufs-tools-0.1.tar.bz2 && cd ufs-tools-0.1
wget http://lkml.org/lkml/diff/2006/5/20/48/1 -O build.patch
patch -p1 < build.patch && make

#create UFS file system on image
./mkufs -O 1 -b 16384 -f 2048 ../image
cd .. && mkdir root
mount -t ufs image root -o loop,ufstype=44bsd
cd root/
touch a.txt
echo "END" > end.txt
dd if=./end.txt of=./a.txt bs=16384 seek=1

and at the end content of "a.txt" not only  "END" and zeroes,
"a.txt" also contains "z".

The real situation happened when I deleted big file,
and create new one with holes. This script just easy way to reproduce bug.
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