On 7/20/20 7:46 PM, Serge E. Hallyn wrote:
On Mon, Jul 20, 2020 at 09:21:08AM -0700, Michael Eager wrote:
On 7/19/20 2:04 PM, Serge E. Hallyn wrote:
On Sun, Jul 19, 2020 at 07:53:08PM +0300, Amir Goldstein wrote:
On Sun, Jul 19, 2020 at 5:13 PM Serge E. Hallyn <se...@hallyn.com> wrote:

On Sun, Jul 19, 2020 at 06:53:03AM -0700, Michael Eager wrote:
On 7/18/20 8:37 PM, Serge E. Hallyn wrote:
On Sat, Jul 18, 2020 at 11:16:16AM -0700, Michael Eager wrote:
I'm running LXD on a Centos 8 host, kernel-4.18.0.  I built and installed
the shiftfs module.

   From what source?

https://github.com/toby63/shiftfs-dkms

Interesting.  Yeah the shiftfs.c looks identical to what's in
ubuntu's, but when I backported that to 4.14 I had to also take
a bunch of other patches 
(https://git.kernel.org/pub/scm/linux/kernel/git/sergeh/linux.git/log/?h=v4.14.180-shiftfs)
which may or may not be in 4.18.  Still, I don't actually think
that's the problem.  NFS has always been difficult to use
with layered filesystems.

Amir, as far as you know, does overlay on top of NFS work
these days?


I know people are using it, but only as lower fs, which are files that
are not expected to be changed.
NFS is not supported as upper fs.

Thanks Amir.  I over-snipped, but Michael is having problems
when NFS is the underlay for shiftfs.  If overlay works fine,
then that's an interesting complication :)

I'm hoping to have some time to try it out soon.

thanks,
-serge

If you would like me to submit a bug report, just tell me where.

Since it's shipped with the Ubuntu kernel, you could test it in an
Ubuntu VM and then file it at
https://bugs.launchpad.net/ubuntu/+source/linux/+filebug  I don't
have any better place to suggest tracking it.

I'm running LXD on CentOS 8, kernel-4.18.0. I built the shiftfs module from https://github.com/toby63/shiftfs-dkms.

I can submit an issue on GitHub or bugzilla.kernel.org. Setting up a Ubunut VM with LXD seems like a bit of work.



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