On Thu, 2011-07-28 at 07:20 -0400, Chuck Lever wrote: > On Jul 27, 2011, at 10:26 PM, Ian Kent wrote: > > > On Tue, 2011-07-26 at 23:30 -0400, Chuck Lever wrote: > >>>> > >>>> For IPv6 support, use functions that are part of the modern libtirpc > >>>> API. This is described in Sun doc 816-1435. You probably will be > >>>> most successful with the "simplified interface" which is described in > >>>> Chapter 4. You might need somewhat more extensive surgery since I'm > >>>> guessing you have separate code paths to invoke the IPv4 and IPv6 > >>>> legacy RPC functions; generally speaking that should not be needed > >>>> when using the libtirpc API. > >>> > >>> I doubt the simplified interface will be adequate since this code was > >>> written because of a need for greater control over timeouts. Perhaps > >>> that won't be the case, I don't know yet. > >> > >> If you want control over connection timeouts, use the expert-level or > >> bottom-level interfaces. Otherwise you can set per-RPC timeouts when > >> clnt_call(3t) is invoked. nfs-utils has some example code > >> (support/nfs/rpc_socket.c is one place to look). > >> > >>> Your suggestion amounts to saying I need to re-write all my RPC > >> code. > >> > >> The substantial change with client-side TI-RPC is how CLIENTs are > >> created. The other RPC operations are similar or the same as they > >> were with the legacy API. Once you get over getnetconfigent(3t) it's > >> really not as bad as it looks. > >> > > > > Umm ... > > > > Why is __rpcb_findaddr() declared in the public header files but not > > defined anywhere is the source? > > > > Why is __rpcb_findaddr_timed() defined in the source but not defined in > > the public header files? > > This version of libtirpc was split from the Sun version over a decade > ago when the code was immature. So you're going to find this kind of > thing in many places. Yes, I was aware of that, but haven't paid enough attention to the doc. > > The TI-RPC API is defined in 816-1435. You really shouldn't consider > using any of the interfaces defined in the headers but not in that > doc, as those are internal interfaces and can change. Ummm .. rpcb_getaddr() might be what I'm looking for, I'll look further. > > On the other hand, we have at least two important RPC-based > applications that can make use of this interface. I wonder if it > makes sense to harden that API but leave it hidden, so apps external > to the library can depend on it. Yeah, but if I can achieve what I need without it that's the way I'll go. It looks like I might not be able to do what I want the way I want with ti-rpc but it is still too early to tell. It's also too early to tell if ti-rpc actually already does some or all of what I need already. Time will tell. One example of something I need is to control the timeout, not the timeout for interactions after the client is constructed but the timeout of the client construction itself, including any queries to rpcbind that may be needed (hence why I want to do that manually too). > > Such apps would not be portable away from Linux nor to Linux > distributions that don't have libtirpc yet. It sounds good but, as we all know, adding things that may need to change or are not designed for external use can be a support burden. Ian -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
