exportfs does not support NFS export

Question

I have a netapp server that is configured to share a folder via NFSv4.
My goal is to communicate to that NFSv4 share from Windows, Since windows NFS client does not support NFSv4, I mounted that NFSv4 from CentOS, and i want to share that mounted folder.
This is the diagram i want to accomplish:
"NetApp Server" ---(NFSv4)--> "CentOS7" ---(SMB/NFSv3)--> "Windows"

I have this in df-T (of the CentOS7):

10.10.10.101:/vol/vol0_unix nfs4        828352   362304    466048  44% /mount    

10.10.10.101 is the netapp address

The next thing i want to do is share that /mount via NFS3 or SMB.
So what did i do ? I added the following to /etc/exports:

[root@CentOS7X86-64 ~]# cat /etc/exports
/mount         *(rw,sync)
[root@CentOS7X86-64 ~]#

Now, when i try to restart nfs or exportfs -a i get the following error:

[root@CentOS7X86-64 ~]# exportfs -a
exportfs: /mount does not support NFS export
[root@CentOS7X86-64 ~]#


[root@CentOS7X86-64 ~]# systemctl status nfs-server.service
nfs-server.service - NFS server and services
   Loaded: loaded (/usr/lib/systemd/system/nfs-server.service; disabled)
   Active: failed (Result: exit-code) since Wed 2016-11-16 12:32:32 IST; 10min ago
  Process: 3488 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=1/FAILURE)

Nov 16 12:32:32 CentOS7X86-64 systemd[1]: Starting NFS server and services...
Nov 16 12:32:32 CentOS7X86-64 exportfs[3488]: exportfs: /mount does not support NFS export
Nov 16 12:32:32 CentOS7X86-64 systemd[1]: nfs-server.service: control process exited, code=exited status=1
Nov 16 12:32:32 CentOS7X86-64 systemd[1]: Failed to start NFS server and services.
Nov 16 12:32:32 CentOS7X86-64 systemd[1]: Unit nfs-server.service entered failed state.

Is the scenario im trying to do possible ? Will i be able to share it via SMB ?

Thanks

Solution

What I tried to do is called re-export NFS mount point. It is not possible (nfs kernel driver)

Comments

[ilansch]

I dont work for superuser:) someone +1 the question, so i answered to my own question saying its not possible. Why? I am not sure. But if kofenman say it cannot be done. I trust his answer, he wrote the open source nfsv4.1 client. ...