- run_check $SUDO_HELPER $TOP/mkfs.btrfs -f $mkfsfeatures $TEST_DEV
- if run_check_stdout $TOP/btrfs inspect-internal dump-super $TEST_DEV | \
+ run_check $SUDO_HELPER "$TOP/mkfs.btrfs" -f \
+ ${mkfsfeatures:+-O ^"$mkfsfeatures"} "$TEST_DEV"
+ if run_check_stdout "$TOP/btrfs" inspect-internal dump-super "$TEST_DEV" | \