take away nfs write permissions instantly

[Kapeller Rene PSI <rene.kapeller@psi.ch>]

Can anyone help me on the following problem:

In order to take away nfs write permissions instantly for a previously 
mounted
nfs directory called '/data', I'm changing the export options for '/data'
on the server to 'ro', while keeping the mount on the client.

exportfs -io ro,sync,wdelay,no_root_squash nfsclient:/data

exportfs -v
/data   nfsserver(ro,wdelay,no_root_squash)

Surprisingly the client can still write to /data at this point, unless I do
umount/mount of /data.

Is this the way it's suposed to work?

Changing the nfs export options on a  SunOS 5.6 while clients have mounted
a nfs path, write permissions are instantly taken away from it.

share -F nfs -o ro,root=nfsclient /data

In both cases I used the following nfs mount options:
mount -o rw,sync,nfsvers=3,wsize=32768,rsize=32768

Thanks!
- Rene




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