1 files changed, 70 insertions, 2 deletions

diff --git a/include/linux/slow-work.h b/include/linux/slow-work.h
index b65c8881f07..13337bf6c3f 100644
--- a/include/linux/slow-work.h
+++ b/include/linux/slow-work.h
@@ -17,13 +17,20 @@
 #ifdef CONFIG_SLOW_WORK
 
 #include <linux/sysctl.h>
+#include <linux/timer.h>
 
 struct slow_work;
+#ifdef CONFIG_SLOW_WORK_DEBUG
+struct seq_file;
+#endif
 
 /*
  * The operations used to support slow work items
  */
 struct slow_work_ops {
+	/* owner */
+	struct module *owner;
+
 	/* get a ref on a work item
 	 * - return 0 if successful, -ve if not
 	 */
@@ -34,6 +41,11 @@ struct slow_work_ops {
 
 	/* execute a work item */
 	void (*execute)(struct slow_work *work);
+
+#ifdef CONFIG_SLOW_WORK_DEBUG
+	/* describe a work item for debugfs */
+	void (*desc)(struct slow_work *work, struct seq_file *m);
+#endif
 };
 
 /*
@@ -42,13 +54,24 @@ struct slow_work_ops {
  *   queued
  */
 struct slow_work {
+	struct module		*owner;	/* the owning module */
 	unsigned long		flags;
 #define SLOW_WORK_PENDING	0	/* item pending (further) execution */
 #define SLOW_WORK_EXECUTING	1	/* item currently executing */
 #define SLOW_WORK_ENQ_DEFERRED	2	/* item enqueue deferred */
 #define SLOW_WORK_VERY_SLOW	3	/* item is very slow */
+#define SLOW_WORK_CANCELLING	4	/* item is being cancelled, don't enqueue */
+#define SLOW_WORK_DELAYED	5	/* item is struct delayed_slow_work with active timer */
 	const struct slow_work_ops *ops; /* operations table for this item */
 	struct list_head	link;	/* link in queue */
+#ifdef CONFIG_SLOW_WORK_DEBUG
+	struct timespec		mark;	/* jiffies at which queued or exec begun */
+#endif
+};
+
+struct delayed_slow_work {
+	struct slow_work	work;
+	struct timer_list	timer;
 };
 
 /**
@@ -67,6 +90,20 @@ static inline void slow_work_init(struct slow_work *work,
 }
 
 /**
+ * slow_work_init - Initialise a delayed slow work item
+ * @work: The work item to initialise
+ * @ops: The operations to use to handle the slow work item
+ *
+ * Initialise a delayed slow work item.
+ */
+static inline void delayed_slow_work_init(struct delayed_slow_work *dwork,
+					  const struct slow_work_ops *ops)
+{
+	init_timer(&dwork->timer);
+	slow_work_init(&dwork->work, ops);
+}
+
+/**
  * vslow_work_init - Initialise a very slow work item
  * @work: The work item to initialise
  * @ops: The operations to use to handle the slow work item
@@ -83,9 +120,40 @@ static inline void vslow_work_init(struct slow_work *work,
 	INIT_LIST_HEAD(&work->link);
 }
 
+/**
+ * slow_work_is_queued - Determine if a slow work item is on the work queue
+ * work: The work item to test
+ *
+ * Determine if the specified slow-work item is on the work queue.  This
+ * returns true if it is actually on the queue.
+ *
+ * If the item is executing and has been marked for requeue when execution
+ * finishes, then false will be returned.
+ *
+ * Anyone wishing to wait for completion of execution can wait on the
+ * SLOW_WORK_EXECUTING bit.
+ */
+static inline bool slow_work_is_queued(struct slow_work *work)
+{
+	unsigned long flags = work->flags;
+	return flags & SLOW_WORK_PENDING && !(flags & SLOW_WORK_EXECUTING);
+}
+
 extern int slow_work_enqueue(struct slow_work *work);
-extern int slow_work_register_user(void);
-extern void slow_work_unregister_user(void);
+extern void slow_work_cancel(struct slow_work *work);
+extern int slow_work_register_user(struct module *owner);
+extern void slow_work_unregister_user(struct module *owner);
+
+extern int delayed_slow_work_enqueue(struct delayed_slow_work *dwork,
+				     unsigned long delay);
+
+static inline void delayed_slow_work_cancel(struct delayed_slow_work *dwork)
+{
+	slow_work_cancel(&dwork->work);
+}
+
+extern bool slow_work_sleep_till_thread_needed(struct slow_work *work,
+					       signed long *_timeout);
 
 #ifdef CONFIG_SYSCTL
 extern ctl_table slow_work_sysctls[];