[lxc-users] Using shiftfs with NFS mounted filesystem

[Michael Eager]

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 <serge at 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.