[RFC,PATCH 0/4] Dynamic Pseudo Root

[Trond Myklebust]

On Fri, 2007-12-07 at 14:57 -0800, Brent Callaghan wrote:
> This seems like a very complicated way to implement a pseudo root.
> 
> Why not implement it the same way as Solaris does it ?
> 
> When a Solaris NFSv4 server gets a PUTROOTFH it returns the client
> the real filehandle for the real system root.  In fact, all  
> filesystems that
> may provide a path to a real export are automatically exported, albeit
> with some simple restrictions:
> 	
> 	o LOOKUPs succeed only for path components that lead to
> 	   exported filesystems.
> 
> 	o READDIR shows only path components that lead to exported
> 	   filesystems.
> 
> The pseudo filesystem is the same as the real filesystem, with
> some restrictions.

Agreed. You are almost forced to do something like this if you want the
filehandles to remain valid when the administrator changes the export
options to allow access to path components that were previously part of
the pseudo-fs. Otherwise, you have to use volatile filehandles, which
are poorly supported by existing clients.

Cheers
  Trond