Re: [nfsv4] FYI: Readdir not allowed on NFS pseudo root

Clarification:  Except for the v4 pseudo root, the server supports 
readdir,

Thanks,
Stevan C. Allen

On May 17, 2004, at 6:15 AM, Jim Rees wrote:

>   Seems like the server would return an "empty" response for READDIR
>   on this special server.
>
> But that would be wrong too.  That would imply the directory is empty. 
>  I
> can imagine a client that would get very confused by this.  Suppose, 
> for
> example, the client caches directory contents after a successful 
> READDIR,
> and uses the cached copy for subsequent lookups.  I think 
> NFS4ERR_ACCESS is
> the only acceptable response.

Spencer wrote:

I don't have a strong opinion.  Either response will likely be a call
generator for the interactive user: "I don't see the files I expect to 
see"
or "I get an error when I try to 'ls' the directory".

With tongue firmly planted in cheek, the server could respond to
the READDIR response with a single entry with a name of:
                 "This server does not support the READDIR operation"

>
>   This also implies that clients must use LOOKUP to traverse the
>   server's namespace on things like traditional mount operations that
>   a client would do.
>
> Yes.  The client must be prepared for this anyway.  In fact, the client
> probably can't tell and doesn't care whether it's in a pseudo-fs or a 
> real
> one.
>
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