/usr/lib/ltp/runtest/fsx is in ltp-kernel-test 20091231+dfsg-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #DESCRIPTION:fsx filesystem stress tests
fsx-linux export TCbin=$LTPROOT/testcases/bin;fsxtest02 10000
#fsx-ext2 fsxtest $SCRATCHDEV ext2 10000
#fsx-ext3 fsxtest $SCRATCHDEV ext3 10000
#fsx-jfs fsxtest $SCRATCHDEV jfs 10000
#fsx-xfs fsxtest $SCRATCHDEV xfs 10000
#fsx-reiserfs fsxtest $SCRATCHDEV reiserfs 10000
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