Bug#786925: overlay and NFS now works

[Thomas Lange <lange@informatik.uni-koeln.de>]

Package: src:linux
Fixed: 4.6.2-1

overlayfs and NFS works if you add the option default_permissions to
the mount command as follow:

mount -t nfs -oro,noatime server:/srv/fai/nfsroot /tmp/lower
mount -t overlay overlay -olowerdir=/tmp/lower,upperdir=/tmp/upper,workdir=/tmp/work,default_permissions /tmp/merged

It works nicely for me with Debian kernel 4.6.2. Without this option,
overwriting an existing file ended with a permissions denied.

This option was added in january 2016 to the kernel. See
http://thread.gmane.org/gmane.linux.file-systems.union/493

IMO we can close this bug now.

-- 
regards Thomas