Re: unable to mount using overlayfs.v22 on kernel 3.15.5

[Klaus A. Kreil]

Woody,
my message obviously ended up in the wrong list due to a mistake of 
mine. I originally thought it got lost until your reply as I am not 
subscribed to linux-kernel@xxxxxxxxxxxxxxxx

But: There is already a discussion about this issue going on at 
linux-unionfs@xxxxxxxxxxxxxxx with Miklos Szeredi, the author of overlayfs.

He has kindly pointed me towards the correct list when I sent him a PM 
about the problem and he rightly has taken the issue to 
linux-unionfs@xxxxxxxxxxxxxxxx I think it would be good if you joined us 
there to keep related things together.

Thanks,

Klaus

Am 24.07.14 14:14, schrieb Woody Suwalski:
> Klaus A. Kreil wrote:
> > Hello list,
> > I have just found out about this mailing list which obviously also
> > takes care of overlayfs.
> >
> > I have been a happy user of overlayfs for quiet some time using it to
> > propagate a shared r/o LVM ext4 lowerdir rootfs with a small r/w ext4
> > upperdir for a number of XEN domU guests. I started with overlayfs on
> > kernel version 3.11.7 (all on gentoo-hardened). Recently I have
> > switched from 3.13.10 (using overlayfs.v21) to 3.15.5 with overlayfs.v22.
> >
> > overlayfs.v22 seems to have changed insofar as there's a new parameter
> > workdir=/dir with dir required to be an empty directory on the same
> > filesystem as upperdir. So I have changed my initramfs to include that
> > parameter and have also created my /dir directory (named /.work, owned
> > by root:root and 0755 mode) on all my individual upperdir filesystems
> > for all of my XEN domUs.
> >
> > Now when I start the new kernel 3.15.5 with the modified init script
> > from the newly created initramfs, I am ending up in a rescue shell.
> > Both the upper and lower filesystem are (as expected) mounted
> > appropriately to /mnt/root_ro and /mnt/root_rw amd /mnt/root exists.
> > Howeverm, trying to combine those two filesystems on /mnt/root (as
> > before and regardless of whether used with or without the workdir=
> > parameter) fails with an error message as follows:
> >
> > # mount -t overlayfs overlayfs -o
> > lowerdir=/mnt/root_ro,upperdir=/mnt/root_rw,workdir=/.work /mnt/root
> > mount: mounting overlayfs on /mnt/root failed: Invalid argument
> >
> > The error message stays the same regardless of where on the command
> > line the overlayfs "device" parameter appears. I can't see what's
> > wrong with the command line given that - with the exception of the
> > workdir=/.work part - the command has not changed from 3.13.10
> > (overlayfs.v21), therefore currently leaving me at loss.
> >
> > I would very much appreciate any help and support in tracking down
> > this unexpected issue.
> >
> > Regards Atom2
> Klaus, I have run into similar problems...
> What works for me:
> Once you mount the upperdir /mnt/root_rw, create /mnt/root_rw/root and
> /mnt/root_rw/workdir and use these for overlayfs mountpoints.
>
> Woody
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