Comment 19 for bug 820134

(In reply to comment #17)
> In the interest of simplicity, I would remove the env var. Unless there's a
> real usecase to that.

There are some reasons. one is to provide a workaround for any other problematic filesystems that may causes similar issues. it can be patched out later though. one is to bypass a syscall when surely no need to check if it's on nfs or not.