RFR 8165852: (fs) Mount point not found for a file which is present in overlayfs

[Alan Bateman]

On 10/01/2018 20:29, Brian Burkhalter wrote:
> The proposed fix [1] for [2] based on [3] is to check /proc/mounts entries both when a device ID boundary is reached and at the end of the file hierarchy upward traversal, i.e., when the parent is null. The change has been verified to work in an ubuntu:16.04 Docker container and does not break existing core regression tests.
>
I think this looks good. We could create a findMountEntry method if 
needed but what you have is okay too.

-Alan