Yes, you'd have to apply the patch to that kernel yourself. No RHEL7
kernels have that patch (so far). Newer RHEL8 kernels _do_ if that's an
option for you.
-- Jeff
On Mon, 2020-11-09 at 19:21 +0100, Frédéric Nass wrote:
I feel lucky to have you on this one. ;-) Do you mean
applying a
specific patch on 3.10 kernel? Or is this one too old to have it working
anyways.
Frédéric.
Le 09/11/2020 à 19:07, Luis Henriques a écrit :
> Frédéric Nass <frederic.nass(a)univ-lorraine.fr> writes:
>
> > Hi Luis,
> >
> > Thanks for your help. Sorry I forgot about the kernel details. This is latest
> > RHEL 7.9.
> >
> > ~/ uname -r
> > 3.10.0-1160.2.2.el7.x86_64
> >
> > ~/ grep CONFIG_TMPFS_XATTR /boot/config-3.10.0-1160.2.2.el7.x86_64
> > CONFIG_TMPFS_XATTR=y
> >
> > upper directory /upperdir is using xattrs
> >
> > ~/ ls -l /dev/mapper/vg0-racine
> > lrwxrwxrwx 1 root root 7 6 mars 2020 /dev/mapper/vg0-racine -> ../dm-0
> >
> > ~/ cat /proc/fs/ext4/dm-0/options | grep xattr
> > user_xattr
> >
> > ~/ setfattr -n user.name -v upperdir /upperdir
> >
> > ~/ getfattr -n user.name /upperdir
> > getfattr: Suppression des « / » en tête des chemins absolus
> > # file: upperdir
> > user.name="upperdir"
> >
> > Are you able to modify the content of a snapshot directory using overlayfs on
> > your side?
> [ Cc'ing Jeff ]
>
> Yes, I'm able to do that using a *recent* kernel. I got curious and after
> some digging I managed to reproduce the issue with kernel 5.3. The
> culprit was commit e09580b343aa ("ceph: don't list vxattrs in
> listxattr()"), in 5.4.
>
> Getting a bit more into the whole rabbit hole, it looks like
> ovl_copy_xattr() will try to copy all the ceph-related vxattrs. And that
> won't work (for ex. for ceph.dir.entries).
>
> Can you try cherry-picking this commit into your kernel to see if that
> fixes it for you?
>
> Cheers,
--
Jeff Layton <jlayton(a)kernel.org>