1 files changed, 204 insertions, 0 deletions
diff --git a/fs/afs/kafstimod.c b/fs/afs/kafstimod.c
new file mode 100644
index 000000000000..86e710dd057e
--- /dev/null
+++ b/fs/afs/kafstimod.c
@@ -0,0 +1,204 @@
+/* kafstimod.c: AFS timeout daemon
+ *
+ * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include "cell.h"
+#include "volume.h"
+#include "kafstimod.h"
+#include <asm/errno.h>
+#include "internal.h"
+
+static DECLARE_COMPLETION(kafstimod_alive);
+static DECLARE_COMPLETION(kafstimod_dead);
+static DECLARE_WAIT_QUEUE_HEAD(kafstimod_sleepq);
+static int kafstimod_die;
+
+static LIST_HEAD(kafstimod_list);
+static DEFINE_SPINLOCK(kafstimod_lock);
+
+static int kafstimod(void *arg);
+
+/*****************************************************************************/
+/*
+ * start the timeout daemon
+ */
+int afs_kafstimod_start(void)
+{
+	int ret;
+
+	ret = kernel_thread(kafstimod, NULL, 0);
+	if (ret < 0)
+		return ret;
+
+	wait_for_completion(&kafstimod_alive);
+
+	return ret;
+} /* end afs_kafstimod_start() */
+
+/*****************************************************************************/
+/*
+ * stop the timeout daemon
+ */
+void afs_kafstimod_stop(void)
+{
+	/* get rid of my daemon */
+	kafstimod_die = 1;
+	wake_up(&kafstimod_sleepq);
+	wait_for_completion(&kafstimod_dead);
+
+} /* end afs_kafstimod_stop() */
+
+/*****************************************************************************/
+/*
+ * timeout processing daemon
+ */
+static int kafstimod(void *arg)
+{
+	struct afs_timer *timer;
+
+	DECLARE_WAITQUEUE(myself, current);
+
+	printk("kAFS: Started kafstimod %d\n", current->pid);
+
+	daemonize("kafstimod");
+
+	complete(&kafstimod_alive);
+
+	/* loop around looking for things to attend to */
+ loop:
+	set_current_state(TASK_INTERRUPTIBLE);
+	add_wait_queue(&kafstimod_sleepq, &myself);
+
+	for (;;) {
+		unsigned long jif;
+		signed long timeout;
+
+		/* deal with the server being asked to die */
+		if (kafstimod_die) {
+			remove_wait_queue(&kafstimod_sleepq, &myself);
+			_leave("");
+			complete_and_exit(&kafstimod_dead, 0);
+		}
+
+		try_to_freeze(PF_FREEZE);
+
+		/* discard pending signals */
+		afs_discard_my_signals();
+
+		/* work out the time to elapse before the next event */
+		spin_lock(&kafstimod_lock);
+		if (list_empty(&kafstimod_list)) {
+			timeout = MAX_SCHEDULE_TIMEOUT;
+		}
+		else {
+			timer = list_entry(kafstimod_list.next,
+					   struct afs_timer, link);
+			timeout = timer->timo_jif;
+			jif = jiffies;
+
+			if (time_before_eq((unsigned long) timeout, jif))
+				goto immediate;
+
+			else {
+				timeout = (long) timeout - (long) jiffies;
+			}
+		}
+		spin_unlock(&kafstimod_lock);
+
+		schedule_timeout(timeout);
+
+		set_current_state(TASK_INTERRUPTIBLE);
+	}
+
+	/* the thing on the front of the queue needs processing
+	 * - we come here with the lock held and timer pointing to the expired
+	 *   entry
+	 */
+ immediate:
+	remove_wait_queue(&kafstimod_sleepq, &myself);
+	set_current_state(TASK_RUNNING);
+
+	_debug("@@@ Begin Timeout of %p", timer);
+
+	/* dequeue the timer */
+	list_del_init(&timer->link);
+	spin_unlock(&kafstimod_lock);
+
+	/* call the timeout function */
+	timer->ops->timed_out(timer);
+
+	_debug("@@@ End Timeout");
+	goto loop;
+
+} /* end kafstimod() */
+
+/*****************************************************************************/
+/*
+ * (re-)queue a timer
+ */
+void afs_kafstimod_add_timer(struct afs_timer *timer, unsigned long timeout)
+{
+	struct afs_timer *ptimer;
+	struct list_head *_p;
+
+	_enter("%p,%lu", timer, timeout);
+
+	spin_lock(&kafstimod_lock);
+
+	list_del(&timer->link);
+
+	/* the timer was deferred or reset - put it back in the queue at the
+	 * right place */
+	timer->timo_jif = jiffies + timeout;
+
+	list_for_each(_p, &kafstimod_list) {
+		ptimer = list_entry(_p, struct afs_timer, link);
+		if (time_before(timer->timo_jif, ptimer->timo_jif))
+			break;
+	}
+
+	list_add_tail(&timer->link, _p); /* insert before stopping point */
+
+	spin_unlock(&kafstimod_lock);
+
+	wake_up(&kafstimod_sleepq);
+
+	_leave("");
+} /* end afs_kafstimod_add_timer() */
+
+/*****************************************************************************/
+/*
+ * dequeue a timer
+ * - returns 0 if the timer was deleted or -ENOENT if it wasn't queued
+ */
+int afs_kafstimod_del_timer(struct afs_timer *timer)
+{
+	int ret = 0;
+
+	_enter("%p", timer);
+
+	spin_lock(&kafstimod_lock);
+
+	if (list_empty(&timer->link))
+		ret = -ENOENT;
+	else
+		list_del_init(&timer->link);
+
+	spin_unlock(&kafstimod_lock);
+
+	wake_up(&kafstimod_sleepq);
+
+	_leave(" = %d", ret);
+	return ret;
+} /* end afs_kafstimod_del_timer() */