Introduce a test which runs fsstress on the top and bottom overlayfs
directories simultaneously to find potential races that plagued
wrapfs derived file systems.
[eguan: add copyright info and fix minor code style issue]
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
Theodore Ts'o