[BUG] garbage instead of zeroes in UFS

["Tomasz Kvarsin" <kvarsin@gmail.com>]

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.