From: Kyle Schmitt <kyleaschmitt@...>
Date: 2009-06-17T03:39:30+09:00
Subject: Re: Which is more expensive Rename or Move?

Because moving and renaming files consist of the same operations.

To really really overly simplify it, moving a directory primarily
involves updating the directory, not every node under it.

I'm a bit busy to lookup papers on how it works, but do some googling
for how filesystems work.