Vorweg: du hast dein /nfs/root verzeichnis schon freigegeben, oder?
Braucht einen eigenen Export-Punkt, weils ein anderes FS auf einem
anderen Device ist.
Wenn das passt:
Folgende Optionen in /etc/exports wären wahrscheinlich interressant:
nohide This option is based on the option of the same name provided in
IRIX NFS. Normally, if a server exports two filesystems one of
which is mounted on the other, then the client will have to
mount both filesystems explicitly to get access to them. If it
just mounts the parent, it will see an empty directory at the
place where the other filesystem is mounted. That filesystem is
Setting the nohide option on a filesystem causes it not to be
hidden, and an appropriately authorised client will be able to
move from the parent to that filesystem without noticing the
However, some NFS clients do not cope well with this situation
as, for instance, it is then possible for two files in the one
apparent filesystem to have the same inode number.
The nohide option is currently only effective on single host
exports. It does not work reliably with netgroup, subnet, or
This option can be very useful in some situations, but it should
be used with due care, and only after confirming that the client
system copes with the situation effectively.
The option can be explicitly disabled with hide.
This option is similar to nohide but it makes it possible for
clients to move from the filesystem marked with crossmnt to
exported filesystems mounted on it. Thus when a child filesys-
tem "B" is mounted on a parent "A", setting crossmnt on "A" has
the same effect as setting "nohide" on B.
ansonsten versuch mal in den export-options für dein
loopback-gemountetes FS mit anzugeben: