#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
+#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/sunrpc/types.h>
static DEFINE_MUTEX(nlmsvc_mutex);
static unsigned int nlmsvc_users;
-static pid_t nlmsvc_pid;
-static struct svc_serv *nlmsvc_serv;
+static struct task_struct *nlmsvc_task;
+static struct svc_rqst *nlmsvc_rqst;
int nlmsvc_grace_period;
unsigned long nlmsvc_timeout;
-static DECLARE_COMPLETION(lockd_start_done);
-static DECLARE_WAIT_QUEUE_HEAD(lockd_exit);
-
/*
* These can be set at insmod time (useful for NFS as root filesystem),
* and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
static const unsigned long nlm_timeout_max = 20;
static const int nlm_port_min = 0, nlm_port_max = 65535;
+#ifdef CONFIG_SYSCTL
static struct ctl_table_header * nlm_sysctl_table;
+#endif
static unsigned long get_lockd_grace_period(void)
{
/*
* This is the lockd kernel thread
*/
-static void
-lockd(struct svc_rqst *rqstp)
+static int
+lockd(void *vrqstp)
{
- int err = 0;
+ int err = 0, preverr = 0;
+ struct svc_rqst *rqstp = vrqstp;
unsigned long grace_period_expire;
- /* Lock module and set up kernel thread */
- /* lockd_up is waiting for us to startup, so will
- * be holding a reference to this module, so it
- * is safe to just claim another reference
- */
- __module_get(THIS_MODULE);
- lock_kernel();
-
- /*
- * Let our maker know we're running.
- */
- nlmsvc_pid = current->pid;
- nlmsvc_serv = rqstp->rq_server;
- complete(&lockd_start_done);
-
- daemonize("lockd");
+ /* try_to_freeze() is called from svc_recv() */
set_freezable();
- /* Process request with signals blocked, but allow SIGKILL. */
+ /* Allow SIGKILL to tell lockd to drop all of its locks */
allow_signal(SIGKILL);
dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
+ /*
+ * FIXME: it would be nice if lockd didn't spend its entire life
+ * running under the BKL. At the very least, it would be good to
+ * have someone clarify what it's intended to protect here. I've
+ * seen some handwavy posts about posix locking needing to be
+ * done under the BKL, but it's far from clear.
+ */
+ lock_kernel();
+
if (!nlm_timeout)
nlm_timeout = LOCKD_DFLT_TIMEO;
nlmsvc_timeout = nlm_timeout * HZ;
/*
* The main request loop. We don't terminate until the last
- * NFS mount or NFS daemon has gone away, and we've been sent a
- * signal, or else another process has taken over our job.
+ * NFS mount or NFS daemon has gone away.
*/
- while ((nlmsvc_users || !signalled()) && nlmsvc_pid == current->pid) {
+ while (!kthread_should_stop()) {
long timeout = MAX_SCHEDULE_TIMEOUT;
- char buf[RPC_MAX_ADDRBUFLEN];
+ RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
if (signalled()) {
flush_signals(current);
nlmsvc_invalidate_all();
grace_period_expire = set_grace_period();
}
+ continue;
}
/*
* recvfrom routine.
*/
err = svc_recv(rqstp, timeout);
- if (err == -EAGAIN || err == -EINTR)
+ if (err == -EAGAIN || err == -EINTR) {
+ preverr = err;
continue;
+ }
if (err < 0) {
- printk(KERN_WARNING
- "lockd: terminating on error %d\n",
- -err);
- break;
+ if (err != preverr) {
+ printk(KERN_WARNING "%s: unexpected error "
+ "from svc_recv (%d)\n", __func__, err);
+ preverr = err;
+ }
+ schedule_timeout_interruptible(HZ);
+ continue;
}
+ preverr = err;
dprintk("lockd: request from %s\n",
svc_print_addr(rqstp, buf, sizeof(buf)));
svc_process(rqstp);
}
-
flush_signals(current);
-
- /*
- * Check whether there's a new lockd process before
- * shutting down the hosts and clearing the slot.
- */
- if (!nlmsvc_pid || current->pid == nlmsvc_pid) {
- if (nlmsvc_ops)
- nlmsvc_invalidate_all();
- nlm_shutdown_hosts();
- nlmsvc_pid = 0;
- nlmsvc_serv = NULL;
- } else
- printk(KERN_DEBUG
- "lockd: new process, skipping host shutdown\n");
- wake_up(&lockd_exit);
-
- /* Exit the RPC thread */
- svc_exit_thread(rqstp);
-
- /* Release module */
+ if (nlmsvc_ops)
+ nlmsvc_invalidate_all();
+ nlm_shutdown_hosts();
unlock_kernel();
- 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;
+ return 0;
}
/*
static int make_socks(struct svc_serv *serv, int proto)
{
static int warned;
+ struct svc_xprt *xprt;
int err = 0;
- if (proto == IPPROTO_UDP || nlm_udpport)
- if (!find_socket(serv, IPPROTO_UDP))
- err = svc_makesock(serv, IPPROTO_UDP, nlm_udpport,
- SVC_SOCK_DEFAULTS);
- if (err >= 0 && (proto == IPPROTO_TCP || nlm_tcpport))
- if (!find_socket(serv, IPPROTO_TCP))
- err = svc_makesock(serv, IPPROTO_TCP, nlm_tcpport,
- SVC_SOCK_DEFAULTS);
-
+ 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, "tcp", 0, 0);
+ if (!xprt)
+ err = svc_create_xprt(serv, "tcp", nlm_tcpport,
+ SVC_SOCK_DEFAULTS);
+ else
+ svc_xprt_put(xprt);
+ }
if (err >= 0) {
warned = 0;
err = 0;
int
lockd_up(int proto) /* Maybe add a 'family' option when IPv6 is supported ?? */
{
- struct svc_serv * serv;
- int error = 0;
+ struct svc_serv *serv;
+ int error = 0;
mutex_lock(&nlmsvc_mutex);
/*
* Check whether we're already up and running.
*/
- if (nlmsvc_pid) {
+ if (nlmsvc_rqst) {
if (proto)
- error = make_socks(nlmsvc_serv, proto);
+ error = make_socks(nlmsvc_rqst->rq_server, proto);
goto out;
}
/*
* Create the kernel thread and wait for it to start.
*/
- error = svc_create_thread(lockd, serv);
- if (error) {
+ nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
+ if (IS_ERR(nlmsvc_rqst)) {
+ error = PTR_ERR(nlmsvc_rqst);
+ nlmsvc_rqst = NULL;
+ printk(KERN_WARNING
+ "lockd_up: svc_rqst allocation failed, error=%d\n",
+ error);
+ goto destroy_and_out;
+ }
+
+ svc_sock_update_bufs(serv);
+
+ nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
+ if (IS_ERR(nlmsvc_task)) {
+ error = PTR_ERR(nlmsvc_task);
+ svc_exit_thread(nlmsvc_rqst);
+ nlmsvc_task = NULL;
+ nlmsvc_rqst = NULL;
printk(KERN_WARNING
- "lockd_up: create thread failed, error=%d\n", error);
+ "lockd_up: kthread_run failed, error=%d\n", error);
goto destroy_and_out;
}
- wait_for_completion(&lockd_start_done);
/*
* Note: svc_serv structures have an initial use count of 1,
void
lockd_down(void)
{
- static int warned;
-
mutex_lock(&nlmsvc_mutex);
if (nlmsvc_users) {
if (--nlmsvc_users)
goto out;
- } else
- printk(KERN_WARNING "lockd_down: no users! pid=%d\n", nlmsvc_pid);
-
- if (!nlmsvc_pid) {
- if (warned++ == 0)
- printk(KERN_WARNING "lockd_down: no lockd running.\n");
- goto out;
+ } else {
+ printk(KERN_ERR "lockd_down: no users! task=%p\n",
+ nlmsvc_task);
+ BUG();
}
- warned = 0;
- kill_proc(nlmsvc_pid, SIGKILL, 1);
- /*
- * Wait for the lockd process to exit, but since we're holding
- * the lockd semaphore, we can't wait around forever ...
- */
- clear_thread_flag(TIF_SIGPENDING);
- interruptible_sleep_on_timeout(&lockd_exit, HZ);
- if (nlmsvc_pid) {
- printk(KERN_WARNING
- "lockd_down: lockd failed to exit, clearing pid\n");
- nlmsvc_pid = 0;
+ if (!nlmsvc_task) {
+ printk(KERN_ERR "lockd_down: no lockd running.\n");
+ BUG();
}
- spin_lock_irq(¤t->sighand->siglock);
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
+ kthread_stop(nlmsvc_task);
+ svc_exit_thread(nlmsvc_rqst);
+ nlmsvc_task = NULL;
+ nlmsvc_rqst = NULL;
out:
mutex_unlock(&nlmsvc_mutex);
}
EXPORT_SYMBOL(lockd_down);
+#ifdef CONFIG_SYSCTL
+
/*
* Sysctl parameters (same as module parameters, different interface).
*/
{ .ctl_name = 0 }
};
+#endif /* CONFIG_SYSCTL */
+
/*
* Module (and sysfs) parameters.
*/
static int __init init_nlm(void)
{
+#ifdef CONFIG_SYSCTL
nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
return nlm_sysctl_table ? 0 : -ENOMEM;
+#else
+ return 0;
+#endif
}
static void __exit exit_nlm(void)
{
/* FIXME: delete all NLM clients */
nlm_shutdown_hosts();
+#ifdef CONFIG_SYSCTL
unregister_sysctl_table(nlm_sysctl_table);
+#endif
}
module_init(init_nlm);
git.openpandora.org / pandora-kernel.git / blobdiff