From 8c3916f4bdf9c8388bd70d0b399b3a43daf2087a Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Fri, 3 Oct 2008 17:15:23 -0400 Subject: [PATCH] NLM: Always start both UDP and TCP listeners Commit 24e36663, which first appeared in 2.6.19, changed lockd so that the client side starts a UDP listener only if there is a UDP NFSv2/v3 mount. Its description notes: This... means that lockd will *not* listen on UDP if the only mounts are TCP mount (and nfsd hasn't started). The latter is the only one that concerns me at all - I don't know if this might be a problem with some servers. Unfortunately it is a problem for Linux itself. The rpc.statd daemon on Linux uses UDP for contacting the local lockd, no matter which protocol is used for NFS mounts. Without a local lockd UDP listener, NFSv2/v3 lock recovery from Linux NFS clients always fails. Revert parts of commit 24e36663 so lockd_up() always starts both listeners. Signed-off-by: Chuck Lever Cc: Neil Brown Signed-off-by: J. Bruce Fields --- fs/lockd/svc.c | 37 +++++++++++++++++++------------------ 1 file changed, 19 insertions(+), 18 deletions(-) diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c index f013aed1153..36396fc058c 100644 --- a/fs/lockd/svc.c +++ b/fs/lockd/svc.c @@ -189,25 +189,28 @@ lockd(void *vrqstp) } /* - * Make any sockets that are needed but not present. - * If nlm_udpport or nlm_tcpport were set as module - * options, make those sockets unconditionally + * Ensure there are active UDP and TCP listeners for lockd. + * + * Even if we have only TCP NFS mounts and/or TCP NFSDs, some + * local services (such as rpc.statd) still require UDP, and + * some NFS servers do not yet support NLM over TCP. + * + * Returns zero if all listeners are available; otherwise a + * negative errno value is returned. */ -static int make_socks(struct svc_serv *serv, int proto) +static int make_socks(struct svc_serv *serv) { static int warned; struct svc_xprt *xprt; int err = 0; - if (proto == IPPROTO_UDP || nlm_udpport) { - xprt = svc_find_xprt(serv, "udp", 0, 0); - if (!xprt) - err = svc_create_xprt(serv, "udp", nlm_udpport, - SVC_SOCK_DEFAULTS); - else - svc_xprt_put(xprt); - } - if (err >= 0 && (proto == IPPROTO_TCP || nlm_tcpport)) { + xprt = svc_find_xprt(serv, "udp", 0, 0); + if (!xprt) + err = svc_create_xprt(serv, "udp", nlm_udpport, + SVC_SOCK_DEFAULTS); + else + svc_xprt_put(xprt); + if (err >= 0) { xprt = svc_find_xprt(serv, "tcp", 0, 0); if (!xprt) err = svc_create_xprt(serv, "tcp", nlm_tcpport, @@ -237,11 +240,8 @@ lockd_up(int proto) /* Maybe add a 'family' option when IPv6 is supported ?? */ /* * Check whether we're already up and running. */ - if (nlmsvc_rqst) { - if (proto) - error = make_socks(nlmsvc_rqst->rq_server, proto); + if (nlmsvc_rqst) goto out; - } /* * Sanity check: if there's no pid, @@ -258,7 +258,8 @@ lockd_up(int proto) /* Maybe add a 'family' option when IPv6 is supported ?? */ goto out; } - if ((error = make_socks(serv, proto)) < 0) + error = make_socks(serv); + if (error < 0) goto destroy_and_out; /* -- 2.41.1