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-rw-r--r--fs/lockd/svc.c150
1 files changed, 70 insertions, 80 deletions
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 38c2f0b1dd7..2169af4d545 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -25,6 +25,7 @@
#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>
@@ -48,14 +49,11 @@ EXPORT_SYMBOL(nlmsvc_ops);
static DEFINE_MUTEX(nlmsvc_mutex);
static unsigned int nlmsvc_users;
-static pid_t nlmsvc_pid;
+static struct task_struct *nlmsvc_task;
static struct svc_serv *nlmsvc_serv;
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
@@ -113,35 +111,30 @@ static inline void clear_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;
@@ -150,10 +143,9 @@ lockd(struct svc_rqst *rqstp)
/*
* 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;
RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
@@ -163,6 +155,7 @@ lockd(struct svc_rqst *rqstp)
nlmsvc_invalidate_all();
grace_period_expire = set_grace_period();
}
+ continue;
}
/*
@@ -181,14 +174,20 @@ lockd(struct svc_rqst *rqstp)
* 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)));
@@ -197,28 +196,19 @@ lockd(struct svc_rqst *rqstp)
}
flush_signals(current);
+ if (nlmsvc_ops)
+ nlmsvc_invalidate_all();
+ nlm_shutdown_hosts();
- /*
- * 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);
+ unlock_kernel();
+
+ nlmsvc_task = NULL;
+ nlmsvc_serv = NULL;
/* Exit the RPC thread */
svc_exit_thread(rqstp);
- /* Release module */
- unlock_kernel();
- module_put_and_exit(0);
+ return 0;
}
/*
@@ -263,14 +253,15 @@ static int make_socks(struct svc_serv *serv, int proto)
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;
+ struct svc_rqst *rqstp;
+ int error = 0;
mutex_lock(&nlmsvc_mutex);
/*
* Check whether we're already up and running.
*/
- if (nlmsvc_pid) {
+ if (nlmsvc_serv) {
if (proto)
error = make_socks(nlmsvc_serv, proto);
goto out;
@@ -297,13 +288,28 @@ lockd_up(int proto) /* Maybe add a 'family' option when IPv6 is supported ?? */
/*
* Create the kernel thread and wait for it to start.
*/
- error = svc_create_thread(lockd, serv);
- if (error) {
+ rqstp = svc_prepare_thread(serv, &serv->sv_pools[0]);
+ if (IS_ERR(rqstp)) {
+ error = PTR_ERR(rqstp);
printk(KERN_WARNING
- "lockd_up: create thread failed, error=%d\n", error);
+ "lockd_up: svc_rqst allocation failed, error=%d\n",
+ error);
+ goto destroy_and_out;
+ }
+
+ svc_sock_update_bufs(serv);
+ nlmsvc_serv = rqstp->rq_server;
+
+ nlmsvc_task = kthread_run(lockd, rqstp, serv->sv_name);
+ if (IS_ERR(nlmsvc_task)) {
+ error = PTR_ERR(nlmsvc_task);
+ nlmsvc_task = NULL;
+ nlmsvc_serv = NULL;
+ printk(KERN_WARNING
+ "lockd_up: kthread_run failed, error=%d\n", error);
+ svc_exit_thread(rqstp);
goto destroy_and_out;
}
- wait_for_completion(&lockd_start_done);
/*
* Note: svc_serv structures have an initial use count of 1,
@@ -325,37 +331,21 @@ EXPORT_SYMBOL(lockd_up);
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(&current->sighand->siglock);
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
+ kthread_stop(nlmsvc_task);
out:
mutex_unlock(&nlmsvc_mutex);
}
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