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Rename is a complex beast. The following table shows which rename(2) operations
should succeed and which should fail.
o: success
E: error (either unionfs or vfs)
X: EXDEV
none = file does not exist
file = file is a file
dir = file is a empty directory
child= file is a non-empty directory
wh = file is a directory containing only whiteouts; this makes it logically
empty
none file dir child wh
file o o E E E
dir o E o E o
child X E X E X
wh o E o E o
Renaming directories:
=====================
Whenever a empty (either physically or logically) directory is being renamed,
the following sequence of events should take place:
1) Remove whiteouts from both source and destination directory
2) Rename source to destination
3) Make destination opaque to prevent anything under it from showing up
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