[Gluster-devel] gluster doesn't like Oracle's FSINFO RPC call

[Niels de Vos]

On Fri, Apr 12, 2013 at 05:23:08PM +0200, Niels de Vos wrote:
> On Thu, Apr 11, 2013 at 12:37:30PM -0400, Michael Brown wrote:
> > That actually broke everything (including Linux trying to mount NFS).
> > 
> > I've modified it slightly to be:
> > 
> > bool_t
> > xdr_nfs_fh3 (XDR *xdrs, nfs_fh3 *objp)
> > {
> >         if (!xdr_bytes (xdrs, (char **)&objp->data.data_val, (u_int *)
> > &objp->data.data_len, NFS3_FHSIZE))
> >                 if (!xdr_opaque (xdrs, &objp, (u_int *)
> > &objp->data.data_len))
> >                         return FALSE;
> >         return TRUE;
> > }
> > 
> > (i.e. only call the xdr_opaque function if the xdr_bytes decode fails)
> 
> Nah, that won't work. The xdr_* functions are modifying the position of 
> the cursor in the XDR-stream. Subsequent reads will continue where the 
> previous one finished.
> 
> What you probably need to do is something like this:
> 
> xdr_nfs_fh3 (XDR *xdrs, nfs_fh3 *objp)
> {
> 	uint32_t size;
> 
> 	if (!xdr_int (xdrs, &size))
> 		if (!xdr_opaque (xdrs, (u_int *)&objp->data.data_len, size))

^ that should be objp->data.data_val of course :-/

> 			return FALSE
> 	return TRUE;
> }
> 
> That will read the size of the fhandle first, to determine how long the opaque 
> fhandle is, and use that size to read it.
> 
> Cheers,
> Niels
> 
> > 
> > But I get no change in behaviour.
> > 
> > Also get these warnings:
> > 
> > xdr-nfs3.c: In function 'xdr_nfs_fh3':
> > xdr-nfs3.c:197: warning: passing argument 2 of 'xdr_opaque' from
> > incompatible pointer type
> > /usr/include/rpc/xdr.h:313: note: expected 'caddr_t' but argument is of
> > type 'struct nfs_fh3 **'
> > xdr-nfs3.c:197: warning: passing argument 3 of 'xdr_opaque' makes
> > integer from pointer without a cast
> > /usr/include/rpc/xdr.h:313: note: expected 'u_int' but argument is of
> > type 'u_int *'
> > 
> > M.
> > 
> > On 13-04-11 07:42 AM, Niels de Vos wrote:
> > > My guess is that this (untested) change would fix it, can you try that?
> > >
> > > --- a/rpc/xdr/src/xdr-nfs3.c
> > > +++ b/rpc/xdr/src/xdr-nfs3.c
> > > @@ -184,7 +184,7 @@ xdr_specdata3 (XDR *xdrs, specdata3 *objp)
> > >  bool_t
> > >  xdr_nfs_fh3 (XDR *xdrs, nfs_fh3 *objp)
> > >  {
> > > -	 if (!xdr_bytes (xdrs, (char **)&objp->data.data_val, (u_int *) &objp->data.data_len, NFS3_FHSIZE))
> > > +	 if (!xdr_opaque (xdrs, &objp, (u_int *) &objp->data.data_len))
> > >  		 return FALSE;
> > >  	return TRUE;
> > >  }
> > >
> > >
> > > HTH,
> > > Niels
> > >
> > >> All I get out of gluster is:
> > >> [2013-04-08 12:54:32.206312] E [nfs3.c:4741:nfs3svc_fsinfo] 0-nfs-nfsv3:
> > >> Error decoding arguments
> > >>
> > >>
> > >> I've attached abridged packet captures and text explanations of the
> > >> packets (thanks to wireshark).
> > >>
> > >> Can someone please look at this and determine if it's gluster's parsing
> > >> of the RPC call to blame, or if it's Oracle?
> > >>
> > >> This is the same setup on which I reported the NFS race condition bug.
> > >> It does have that patch applied.
> > >> Details:
> > >> http://lists.gnu.org/archive/html/gluster-devel/2013-04/msg00014.html
> > >>
> > >> Thanks,
> > >>
> > >> Michael
> > >>
> > >> -- 
> > >> Michael Brown               | `One of the main causes of the fall of
> > >> Systems Consultant          | the Roman Empire was that, lacking zero,
> > >> Net Direct Inc.             | they had no way to indicate successful
> > >> ?: +1 519 883 1172 x5106    | termination of their C programs.' - Firth
> > >>
> > >
> > >
> > >
> > >
> > >> _______________________________________________
> > >> Gluster-devel mailing list
> > >> Gluster-devel at nongnu.org
> > >> https://lists.nongnu.org/mailman/listinfo/gluster-devel
> > >
> > 
> > 
> > -- 
> > Michael Brown               | `One of the main causes of the fall of
> > Systems Consultant          | the Roman Empire was that, lacking zero,
> > Net Direct Inc.             | they had no way to indicate successful
> > ☎: +1 519 883 1172 x5106    | termination of their C programs.' - Firth
> > 
> 
> -- 
> Niels de Vos
> Sr. Software Maintenance Engineer
> Support Engineering Group
> Red Hat Global Support Services
> 
> _______________________________________________
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> Gluster-devel at nongnu.org
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-- 
Niels de Vos
Sr. Software Maintenance Engineer
Support Engineering Group
Red Hat Global Support Services