Linux users are about to get yet another toy: overlayfs. It's a
union fs that can be used to virtually merge a global read-only
FG_ROOT ("lower dir") and a personal overlaid read/write fg-data
("upper") dir, e.g.:

  $ mount -t overlay -olowerdir=$FG_ROOT,upperdir=$FG_HOME/data overlay 
~/fgfs/data
  $ fgfs --fg-root=$HOME/fgfs/data

This works similar to FG_SCENERY or FG_AIRCRAFT, but includes
the whole data tree. The resulting virtual dir contains every file
from FG_ROOT, and every file that gets written to will be written
to the overlay dir. The resulting dir shows them merged. This
makes it easy to swap e.g. terrain texture files without creating
a mess with git-pull.

  http://marcinfo/?l=linux-fsdevel&m=130080789530237&w=2

m.



PS: some more good news: "Nouveau's OpenGL Performance Approaches The
    NVIDIA Driver" ... well, on *some* cards ... in *some* tests
    anyway. http://www.phoronix.com/scan.php?page=article&item=nouveau_2639_flip

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