Re: index=on,nfs_export=on Operation not permitted

From: Carl Karsten <carl@nextdayvideo.com>
To: Amir Goldstein <amir73il@gmail.com>
Cc: overlayfs <linux-unionfs@vger.kernel.org>
Subject: Re: index=on,nfs_export=on Operation not permitted
Date: Tue, 30 Nov 2021 07:41:47 -0800	[thread overview]
Message-ID: <CADmzSSgjHs2Hk_OLrgBKt5LQZ5hJjmC8Q_ATw+mwYq1SZLbndg@mail.gmail.com> (raw)
In-Reply-To: <CAOQ4uxjPMHnS3zU11t_Jo5OXAv4-vXj4+9BtAxMUt0ueTFgmtQ@mail.gmail.com>

this worked fine on buster
mount -t overlay overlay -o index=on,nfs_export=on,\

On bullseye I got the error: Operation not permitted
remov index=on, no error.

The rname/error did not cause anything to appear in dmesg.

giving it a bit more thought, I suspect there is a bug in bullseye:
index=on triggered the error.

I'll try to recreate this shortly after Dec 12.

On Tue, Nov 30, 2021 at 7:19 AM Amir Goldstein <amir73il@gmail.com> wrote:
>
> On Tue, Nov 30, 2021 at 4:54 PM Carl Karsten <carl@nextdayvideo.com> wrote:
> >
> > I don't need any help, This seems odd enough to report.
> >
> > I accidentally  built my nfs server on buster, which threw some errors
> > about index=on, so I added index=on.  Then I rebuilt the server on
> > bullseye, and almost everything was the same, except for 1 little
> > thing.  I removed the index=on, and all was well again.
> >
> > server:
> > dist=bullseye
> > d=/srv/nfs/rpi/${dist}
> > p=${d}/boot
> > rm -rf ${p}/work/index
> > mount -t overlay overlay -o index=on,nfs_export=on,\
> > lowerdir=${p}/setup:${p}/base,\
> > upperdir=${p}/updates,\
> > workdir=${p}/work \
> >     ${p}/merged
> >
> > /etc/exports
> > /srv/nfs/rpi/bullseye/boot/merged
> > *(rw,sync,no_subtree_check,no_root_squash,fsid=1)
> >
> >
> > client:
> > root@raspberrypi:~# mount
> > 10.21.0.1:/srv/nfs/rpi/bullseye/root/merged on / type nfs
> > (rw,relatime,vers=3,rsize=4096,wsize=4096,namlen=255,hard,nolock,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=10.21.0.1,mountvers=3,mountproto=tcp,local_lock=all,addr=10.21.0.1)
> >
> > root@raspberrypi:~# mv /boot/z /boot/config.txt
> > mv: cannot move '/boot/z' to '/boot/config.txt': Operation not permitted
> >
> > root@raspberrypi:~# strace mv /boot/z /boot/config.txt
>
> strace is not useful information.
> kernel log would have been able to shed more light on the error.
>
> But I did not understand the report.
> The error was on buster/bullseye? with index=on? without index=on?
> You managed to confuse me.
> index=on is deferred from nfs_export=on since commit
> b0def88d807f ovl: resolve more conflicting mount options
>
> So that is probably the difference between buster/bullseye.
> Didn't check which kernels they use.
>
> Thanks,
> Amir.

-- 
Carl K