From 24e36663c375df577d2dcae437713481ffd6850c Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 2 Oct 2006 02:17:45 -0700 Subject: [PATCH] knfsd: be more selective in which sockets lockd listens on Currently lockd listens on UDP always, and TCP if CONFIG_NFSD_TCP is set. However as lockd performs services of the client as well, this is a problem. If CONFIG_NfSD_TCP is not set, and a tcp mount is used, the server will not be able to call back to lockd. So: - add an option to lockd_up saying which protocol is needed - Always open sockets for which an explicit port was given, otherwise only open a socket of the type required - Change nfsd to do one lockd_up per socket rather than one per thread. This - removes the dependancy on CONFIG_NFSD_TCP - means that lockd may open sockets other than at startup - 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. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/lockd/clntlock.c | 2 +- fs/lockd/svc.c | 47 ++++++++++++++++++++++++++++++++++++++++------- 2 files changed, 41 insertions(+), 8 deletions(-) (limited to 'fs/lockd') diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c index f95cc3f..6abb465 100644 --- a/fs/lockd/clntlock.c +++ b/fs/lockd/clntlock.c @@ -202,7 +202,7 @@ reclaimer(void *ptr) /* This one ensures that our parent doesn't terminate while the * reclaim is in progress */ lock_kernel(); - lockd_up(); + lockd_up(0); nlmclnt_prepare_reclaim(host); /* First, reclaim all locks that have been marked. */ diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c index 13feba4..8d19de6 100644 --- a/fs/lockd/svc.c +++ b/fs/lockd/svc.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include @@ -46,6 +47,7 @@ EXPORT_SYMBOL(nlmsvc_ops); static DEFINE_MUTEX(nlmsvc_mutex); static unsigned int nlmsvc_users; static pid_t nlmsvc_pid; +static struct svc_serv *nlmsvc_serv; int nlmsvc_grace_period; unsigned long nlmsvc_timeout; @@ -112,6 +114,7 @@ lockd(struct svc_rqst *rqstp) * Let our maker know we're running. */ nlmsvc_pid = current->pid; + nlmsvc_serv = serv; complete(&lockd_start_done); daemonize("lockd"); @@ -189,6 +192,7 @@ lockd(struct svc_rqst *rqstp) nlmsvc_invalidate_all(); nlm_shutdown_hosts(); nlmsvc_pid = 0; + nlmsvc_serv = NULL; } else printk(KERN_DEBUG "lockd: new process, skipping host shutdown\n"); @@ -205,11 +209,42 @@ lockd(struct svc_rqst *rqstp) module_put_and_exit(0); } + +static int find_socket(struct svc_serv *serv, int proto) +{ + struct svc_sock *svsk; + int found = 0; + list_for_each_entry(svsk, &serv->sv_permsocks, sk_list) + if (svsk->sk_sk->sk_protocol == proto) { + found = 1; + break; + } + return found; +} + +static int make_socks(struct svc_serv *serv, int proto) +{ + /* Make any sockets that are needed but not present. + * If nlm_udpport or nlm_tcpport were set as module + * options, make those sockets unconditionally + */ + int err = 0; + if (proto == IPPROTO_UDP || nlm_udpport) + if (!find_socket(serv, IPPROTO_UDP)) + err = svc_makesock(serv, IPPROTO_UDP, nlm_udpport); + if (err) + return err; + if (proto == IPPROTO_TCP || nlm_tcpport) + if (!find_socket(serv, IPPROTO_TCP)) + err= svc_makesock(serv, IPPROTO_TCP, nlm_tcpport); + return err; +} + /* * Bring up the lockd process if it's not already up. */ int -lockd_up(void) +lockd_up(int proto) /* Maybe add a 'family' option when IPv6 is supported ?? */ { static int warned; struct svc_serv * serv; @@ -224,8 +259,10 @@ lockd_up(void) /* * Check whether we're already up and running. */ - if (nlmsvc_pid) + if (nlmsvc_pid) { + error = make_socks(nlmsvc_serv, proto); goto out; + } /* * Sanity check: if there's no pid, @@ -242,11 +279,7 @@ lockd_up(void) goto out; } - if ((error = svc_makesock(serv, IPPROTO_UDP, nlm_udpport)) < 0 -#ifdef CONFIG_NFSD_TCP - || (error = svc_makesock(serv, IPPROTO_TCP, nlm_tcpport)) < 0 -#endif - ) { + if ((error = make_socks(serv, proto)) < 0) { if (warned++ == 0) printk(KERN_WARNING "lockd_up: makesock failed, error=%d\n", error); -- cgit v1.1