On Thu, Sep 27, 2012 at 10:33:45PM -0500, Eric Sandeen wrote:
> Test 068 is the go-to test for freeze deadlock coverage;
> unfortunately it only uses fsstress, which doesn't do any mmap
> Using the existing fstest binary gets us a cheap mmap exerciser
> as well.
> Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
> I think it's fair to modify this test vs. making a new one -
> it's never passed yet, and will only start passing in kernel 3.6,
> so it shouldn't cause new test regressions to add mmap ops.
> And I can verify that this finds mmap bugs; I had a backport
> which messed up ext4's freeze vs. mmap handling, and this exposes
> it. :)
> diff --git a/068 b/068
> index 617420c..a0bf425 100755
> --- a/068
> +++ b/068
> @@ -90,6 +90,21 @@ touch $tmp.running
> rmdir $STRESS_DIR
> } &
> +# start fstest -m loop in a background block; this gets us mmap coverage
> + FSTEST_DIR="$SCRATCH_MNT/fstest_test_dir"
> + mkdir "$FSTEST_DIR"
> + procs=2
> + while [ -f "$tmp.running" ]
> + do
> + src/fstest -m -p $FSTEST_DIR -n $procs -f 4 > /dev/null 2>&1
> + done
> + rm -rf $FSTEST_DIR/*
> + rmdir $FSTEST_DIR
> +} &
Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>