[pnfs] Oops in latest pnfs client

[Sager, Mike]

Using the latest 2.6.18 pnfs client, I'm hitting an Oops when executing
basic test #1 of  connectathon -- in particular, when it's trying to
remove a test directory.
 
The key is that I'm running 4.1 in a non-pnfs environment, i.e., no data
servers.  The Oops occurs near the beginning of pnfs_return_layout (as a
sidenote, should this be getting called if there's no layout?) at:
 
       arg.layout_type = server->pnfs_curr_ld->id;
 
It's a null dereference as pnfs_curr_ld is 0.
 
Prior to recent updates, it didn't get that far due to this check right
before:
 
        if (nfsi->current_layout == NULL)
                return 0;
 
I'll submit a patch to restore the check unless there's some objection
(I verified that cthon basic/general/special pass with it).
 
Mike
 
 
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