[cs631apue] whiteout files

[Jan Schaumann]

Hey,

Since this came up last week, I've just uploaded a new
video explaining the UnionFS and whiteout files:

https://youtu.be/MkFExG9jhEE

In order to see whiteout files when using fts(3), you
need to pass FTS_WHITEOUT as a flag to fts_open(3).
You can then check the FTS_W flag in the fts_info
field to identify such files; alternatively, you can
use the S_ISWHT macro to test the st_mode.

-Jan