iotests: Test preallocated truncate of 2G image

    $QEMU_IMG resize -f "$IMGFMT" --shrink --preallocation=$growth_mode "$TEST_IMG" -${GROWTH_SIZE}K

done

echo

echo '=== Testing image growth on 2G empty image ==='

for growth_mode in falloc full; do

    echo

    echo "--- growth_mode=$growth_mode ---"

    # Maybe we want to do an lseek() to the end of the file before the

    # preallocation; if the file has a length of 2 GB, that would

    # return an integer that overflows to negative when put into a

    # plain int.  We should use the correct type for the result, and

    # this tests we do.

    _make_test_img 2G

    $QEMU_IMG resize -f "$IMGFMT" --preallocation=$growth_mode "$TEST_IMG" +${GROWTH_SIZE}K

    actual_size=$($QEMU_IMG info -f "$IMGFMT" "$TEST_IMG" | grep 'disk size')

    actual_size=$(echo "$actual_size" | sed -e 's/^[^0-9]*\([0-9]\+\).*$/\1/')

    if [ $actual_size -lt $GROWTH_SIZE ]; then

        echo "ERROR: Image should have at least ${GROWTH_SIZE}K, but has ${actual_size}K"

    fi

done

# success, all done

echo '*** done'

rm -f $seq.full

--- growth_mode=off ---

Image resized.

=== Testing image growth on 2G empty image ===

--- growth_mode=falloc ---

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2147483648

Image resized.

--- growth_mode=full ---

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2147483648

Image resized.

*** done