null mount does not accept -o update

Simon 'corecode' Schubert corecode at
Sun Sep 27 11:43:47 PDT 2009

In contrast to all other file systems, null mounts can not be updated, 
using mount -u or -o update.  That means that null mounts (of PFS 
usually) which were initially mounted ro can not be upgraded to rw, but 
have to be unmounted first.

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