From: Chuck Lever Subject: [PATCH 6/7] SUNRPC: Split portmap unregister API into separate function Date: Mon, 18 Aug 2008 19:34:08 -0400 Message-ID: <20080818233407.1214.52540.stgit@manray.1015granger.net> References: <20080818233128.1214.48603.stgit@manray.1015granger.net> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Cc: linux-nfs@vger.kernel.org To: bfields@fieldses.org, trond.myklebust@netapp.com Return-path: Received: from rgminet01.oracle.com ([148.87.113.118]:43853 "EHLO rgminet01.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752913AbYHSMHK (ORCPT ); Tue, 19 Aug 2008 08:07:10 -0400 In-Reply-To: <20080818233128.1214.48603.stgit-meopP2rzCrTwdl/1UfZZQIVfYA8g3rJ/@public.gmane.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: Create a separate server-level interface for unregistering RPC services. The mechanics of, and the API for, registering and unregistering RPC services will diverge further as support for IPv6 is added. Signed-off-by: Chuck Lever --- net/sunrpc/svc.c | 62 ++++++++++++++++++++++++++++++++++++++++++++---------- 1 files changed, 50 insertions(+), 12 deletions(-) diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index c2eb72c..3d4c0b0 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -28,6 +28,8 @@ #define RPCDBG_FACILITY RPCDBG_SVCDSP +static void svc_unregister(const struct svc_serv *serv); + #define svc_serv_is_pooled(serv) ((serv)->sv_function) /* @@ -417,9 +419,8 @@ __svc_create(struct svc_program *prog, unsigned int bufsize, int npools, spin_lock_init(&pool->sp_lock); } - /* Remove any stale portmap registrations */ - svc_register(serv, 0, 0); + svc_unregister(serv); return serv; } @@ -488,8 +489,7 @@ svc_destroy(struct svc_serv *serv) if (svc_serv_is_pooled(serv)) svc_pool_map_put(); - /* Unregister service with the portmapper */ - svc_register(serv, 0, 0); + svc_unregister(serv); kfree(serv->sv_pools); kfree(serv); } @@ -729,12 +729,10 @@ int svc_register(struct svc_serv *serv, int proto, unsigned short port) { struct svc_program *progp; - unsigned long flags; unsigned int i; int error = 0; - if (!port) - clear_thread_flag(TIF_SIGPENDING); + BUG_ON(proto == 0 && port == 0); for (progp = serv->sv_program; progp; progp = progp->pg_next) { for (i = 0; i < progp->pg_nvers; i++) { @@ -758,13 +756,53 @@ svc_register(struct svc_serv *serv, int proto, unsigned short port) } } - if (!port) { - spin_lock_irqsave(¤t->sighand->siglock, flags); - recalc_sigpending(); - spin_unlock_irqrestore(¤t->sighand->siglock, flags); + return error; +} + +/* + * All transport protocols and ports for this service are removed + * from the local rpcbind database if the service is not hidden. + * + * The result of unregistration is reported via dprintk for those + * who want verification of the result, but is otherwise not + * important. + * + * The local rpcbind daemon listens on either only IPv6 or only + * IPv4. The kernel can't tell how it's configured. However, + * AF_INET addresses are mapped to AF_INET6 in IPv6-only config- + * urations, so even an unregistration request on AF_INET will + * get to a local rpcbind daemon listening only on AF_INET6. So + * we always unregister via AF_INET. + * + * At this point we don't need rpcbind version 4 for unregis- + * tration: A v2 UNSET request will clear all transports (netids), + * addresses, and address families for [program, version]. + */ +static void svc_unregister(const struct svc_serv *serv) +{ + struct svc_program *progp; + unsigned long flags; + unsigned int i; + int error; + + clear_thread_flag(TIF_SIGPENDING); + + for (progp = serv->sv_program; progp; progp = progp->pg_next) { + for (i = 0; i < progp->pg_nvers; i++) { + if (progp->pg_vers[i] == NULL) + continue; + if (progp->pg_vers[i]->vs_hidden) + continue; + + error = rpcb_register(progp->pg_prog, i, 0, 0); + dprintk("svc: svc_unregister(%sv%u), error %d\n", + progp->pg_name, i, error); + } } - return error; + spin_lock_irqsave(¤t->sighand->siglock, flags); + recalc_sigpending(); + spin_unlock_irqrestore(¤t->sighand->siglock, flags); } /*