We now have some evidence that PMAP_UNSET clears only "inet" entries, and not "inet6" entries, in the rpcbind database. The svc_unregister() function also must work if user space doesn't support rpcbind version 4 at all. Thus we'll send an rpcbind v4 UNSET, and if that fails, we'll send a PMAP_UNSET. This simplifies the code in svc_unregister() and provides better backwards compatibility with legacy user space that does not support rpcbind version 4. This patch is part of a series that addresses http://bugzilla.kernel.org/show_bug.cgi?id=12256 Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx> Tested-and-Acked-by: Steve Dickson <steved@xxxxxxxxxx> --- net/sunrpc/svc.c | 35 ++++++++++++++--------------------- 1 files changed, 14 insertions(+), 21 deletions(-) diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index c89f04e..f1e0ad8 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -896,38 +896,31 @@ int svc_register(const struct svc_serv *serv, const int family, return error; } -#ifdef CONFIG_SUNRPC_REGISTER_V4 - +/* + * If user space is running rpcbind, it should take the v4 UNSET + * and clear everything for this [program, version]. If user space + * is running portmap, it will reject the v4 UNSET, but won't have + * any "inet6" entries anyway. So a PMAP_UNSET should be sufficient + * in this case to clear all existing entries for [program, version]. + */ static void __svc_unregister(const u32 program, const u32 version, const char *progname) { - struct sockaddr_in6 sin6 = { - .sin6_family = AF_INET6, - .sin6_addr = IN6ADDR_ANY_INIT, - .sin6_port = 0, - }; int error; - error = rpcb_v4_register(program, version, - (struct sockaddr *)&sin6, ""); - dprintk("svc: %s(%sv%u), error %d\n", - __func__, progname, version, error); -} - -#else /* CONFIG_SUNRPC_REGISTER_V4 */ + error = rpcb_v4_register(program, version, NULL, ""); -static void __svc_unregister(const u32 program, const u32 version, - const char *progname) -{ - int error; + /* + * User space didn't support rpcbind v4, so retry this + * request with the legacy rpcbind v2 protocol. + */ + if (error == -EPROTONOSUPPORT) + error = rpcb_register(program, version, 0, 0); - error = rpcb_register(program, version, 0, 0); dprintk("svc: %s(%sv%u), error %d\n", __func__, progname, version, error); } -#endif /* CONFIG_SUNRPC_REGISTER_V4 */ - /* * All netids, bind addresses and ports registered for [program, version] * are removed from the local rpcbind database (if the service is not -- 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
