From: mehta kiran <kiranmehta1981@yahoo.com>
Subject: Re: file :"/var/lib/nfs/rmtab"
Date: Thu, 3 Feb 2005 03:38:20 -0800 (PST)
Message-ID: <20050203113820.811.qmail@web51601.mail.yahoo.com>
References: <42020B15.4030602@moving-picture.com>
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Cc: nfs@lists.sourceforge.net
To: James Pearson <james-p@moving-picture.com>
In-Reply-To: <42020B15.4030602@moving-picture.com>
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

Hi James , 
          I know that if there is no entry for
          particualr client in rmtab (due to whatever
          reasons) it gets permission denied error
          because mountd verifies clients access  to
          filesystem using rmtab. But what i want to
          know is why does  mountd 
          use rmtab ? Isn't handle supplied by client
          enough to verify clients access to
          filesystem.?

          I have seen that server uses entry from
         rmtab only once when client access
         filesystem (after server restart).Later if
         entry from rmtab is removed client is still
         able to access filesystem without any
         problem.
         
thanks , 
 --kiran         
        

--- James Pearson <james-p@moving-picture.com> wrote:

> mehta kiran wrote:
> > Hi , 
> >        In mountd man page , it written that
> >        rmtab is ornamental and client can contiune
> >        to use filesystem even after calling umount
> >        for that filesystem.
> > 
> >        Is there any real use of this rmtab file ?
> >        Does mountd use this file to know the
> >        clients having access to filesystem ?
> >        If yes , isn,t filehandle supplied by 
> >        client enough to prove that client has
> access
> >        to filesystem. ?
> 
> On 2.4 kernels it is not 'ornamental' - if the
> server reboots without an 
> entry for a client mount in /var/lib/nfs/rmtab, then
> the client will get 
> a stale NFS file handle when the server reboots.
> This can happen if 
> umount fails e.g. the mount point is busy -
> rpc.mountd on the server 
> removes the entry from /var/lib/nfs/rmtab, but
> umount fails, so the file 
> system remains mounted.
> 
> I believe the situation has changed with 2.6.
> 
> James Pearson
> 


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