I am in the process of setting up an "NFS-proxy", a machine which
mounts directories from an NetApp-filer using NFS3, and should re-export
them using NFS4 (with Kerberos).
But apparently nfsd doesn't support re-exporting NFS-mounted dirs:
# mount | grep home
netapp.example.com:/vol/home/schumar on /srv/nfs4/home/schumar type nfs
# cat /etc/exports
/srv/nfs4/home/schumar gss/krb5(rw,sync,fsid=0,secure,no_subtree_check)
# exportfs -r
exportfs: Warning: /srv/nfs4/home/schumar does not support NFS export.
I traced this back to linux-2.6.25.1/fs/nfsd/export.c, where it says, starting
in line 386:
if (!inode->i_sb->s_export_op ||
!inode->i_sb->s_export_op->fh_to_dentry) {
dprintk("exp_export: export of invalid fs type.\n");
return -EINVAL;
}
(and a quick look in fs/nfs/super.c confirmed that the nfs-client never
sets an export_op)
Is there a technical reason for this (i.e. is it simply theoretically
impossible to re-export an NFS-mount), or is my use-case so strange that
nobody has ever needed this until now, and thus it just wasn't coded?
Or am I just stupid/blind? (wouldn't be the first time :)
Thanks in advance,
--
Infineon Technologies IT-Services GmbH Martin.Schuster1@xxxxxxxxxxxx
Lakeside B05, 9020 Klagenfurt, Austria Martin Schuster
FB: LG Klagenfurt, FN 246787y +43 5 1777 3517
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