On Fri, Oct 27, 2017 at 05:20:48PM +0200, Anisse Astier wrote: > Hi, > > Would it be possible to backport upstream commit > ca4c8a3a800039c2681d609c5b7491c1bd17c0a7 into 4.9 ? > > From: Miklos Szeredi <mszeredi@xxxxxxxxxx> > ovl: treat special files like a regular fs > > No sense in opening special files on the underlying layers, they work just > as well if opened on the overlay. > > Side effect is that it's no longer possible to connect one side of a pipe > opened on overlayfs with the other side opened on the underlying layer. > > > Before this it's impossible to do in-kernel resolution of a device file, > for example to mount or use dmsetup. So, this adds a new feature, and does not fix a bug, right? :) > Miklos, you say this might cause a behaviour change in a very > particular case; but did it cause an issue upstream since it was merged > in 4.10 ? > > I also wish this was fixed in 4.1, so I did a tentative backport below. > What do you think Sasha, Miklos ? What is preventing you from using a newer kernel like 4.13 if you rely on this new feature? thanks, greg k-h