Starting with 4.8 the kernel doesn't allow to create inodes
with a uid or gid unknown to an user namespace where a file
system was mounted.
036d523641c66 ("vfs: Don't create inodes with a uid or gid unknown to the vfs")
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>