This patch introduces CFQ meta data (cfq_meta data).
This creates new control data layer over traditional control data (cfq_data).

The new cfq optional operations:
The "cfq_init_queue_fn" defines a function that runs when a new device is plugged, namely
new I/O queue is created.

The "cfq_exit_queue_fn" defines a function that runs when device is unplugged, namely 
I/O queue is removed.

   Signed-off-by: Satoshi UCHIDA <uchida@ap.jp.nec.com>

diff --git a/block/cfq-cgroup.c b/block/cfq-cgroup.c
index 95663f9..34894d9 100644
--- a/block/cfq-cgroup.c
+++ b/block/cfq-cgroup.c
@@ -18,6 +18,8 @@
 #define CFQ_CGROUP_SLICE_SCALE		(5)
 #define CFQ_CGROUP_MAX_IOPRIO		(8)
 
+static const int cfq_cgroup_slice_idle = HZ / 125;
+
 struct cfq_cgroup {
 	struct cgroup_subsys_state css;
 	unsigned int ioprio;
@@ -30,6 +32,52 @@ static inline struct cfq_cgroup *cgroup_to_cfq_cgroup(struct cgroup *cont)
 			    struct cfq_cgroup, css);
 }
 
+/*
+ * Add device or cgroup data functions.
+ */
+static struct cfq_meta_data *cfq_cgroup_init_meta_data(struct cfq_data *cfqd, struct request_queue *q)
+{
+	struct cfq_meta_data *cfqmd;
+	
+	cfqmd = kmalloc_node(sizeof(*cfqmd), GFP_KERNEL | __GFP_ZERO, q->node);
+	if (!cfqmd) {
+		return NULL;
+	}
+	cfqmd->elv_data = cfqd;
+
+	cfqmd->cfq_driv_d.queue = q;
+	INIT_WORK(&cfqmd->cfq_driv_d.unplug_work, cfq_kick_queue);
+	cfqmd->cfq_driv_d.last_end_request = jiffies;
+       
+	init_timer(&cfqmd->cfq_driv_d.idle_slice_timer);
+	cfqmd->cfq_driv_d.idle_slice_timer.function = cfq_idle_slice_timer;
+	cfqmd->cfq_driv_d.idle_slice_timer.data = (unsigned long) cfqd;
+	cfqmd->cfq_driv_d.cfq_slice_idle = cfq_cgroup_slice_idle;
+
+	return cfqmd;
+}
+
+ 
+struct cfq_data *__cfq_cgroup_init_queue(struct request_queue *q, void *data)
+{
+	struct cfq_meta_data *cfqmd = (struct cfq_meta_data *)data;
+	struct cfq_data *cfqd = __cfq_init_cfq_data(q);
+
+	if (!cfqd)
+		return NULL;
+
+	if (!cfqmd) {
+       		cfqmd = cfq_cgroup_init_meta_data(cfqd, q);
+		if (!cfqmd) {
+			kfree(cfqd);
+			return NULL;
+		}
+	}
+
+	return cfqd;
+}
+
+
 static struct cgroup_subsys_state *
 cfq_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
 {
@@ -50,6 +98,18 @@ cfq_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
 	return &cfqc->css;	
 }
 
+
+/*
+ * Remove device or cgroup data functions.
+ */
+static void __cfq_cgroup_exit_data(struct cfq_data *cfqd)
+{
+	struct cfq_meta_data *cfqmd = cfqd->cfqmd;
+
+	__cfq_exit_data(cfqd);
+	kfree(cfqmd);
+}
+
 static void cfq_cgroup_destroy(struct cgroup_subsys *ss, struct cgroup *cont)
 {
 	kfree(cgroup_to_cfq_cgroup(cont));
@@ -154,4 +214,6 @@ struct cgroup_subsys cfq_cgroup_subsys = {
 
 
 struct cfq_ops opt = {
+	.cfq_init_queue_fn = __cfq_cgroup_init_queue,
+	.cfq_exit_queue_fn = __cfq_cgroup_exit_data,
 };
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 245c252..b1757bc 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1926,7 +1926,7 @@ queue_fail:
 	return 1;
 }
 
-static void cfq_kick_queue(struct work_struct *work)
+void cfq_kick_queue(struct work_struct *work)
 {
 	struct request_queue *q =  __cfq_container_of_queue(work);
 	unsigned long flags;
@@ -1939,7 +1939,7 @@ static void cfq_kick_queue(struct work_struct *work)
 /*
  * Timer running if the active_queue is currently idling inside its time slice
  */
-static void cfq_idle_slice_timer(unsigned long data)
+void cfq_idle_slice_timer(unsigned long data)
 {
 	struct cfq_data *cfqd = (struct cfq_data *) data;
 	struct cfq_queue *cfqq;
@@ -2002,17 +2002,17 @@ static void cfq_put_async_queues(struct cfq_data *cfqd)
 		cfq_put_queue(cfqd->async_idle_cfqq);
 }
 
-static void cfq_exit_queue(elevator_t *e)
+void __cfq_exit_data(struct cfq_data *cfqd)
 {
-	struct cfq_data *cfqd = e->elevator_data;
 	struct request_queue *q = CFQ_DRV_UNIQ_DATA(cfqd).queue;
 
 	cfq_shutdown_timer_wq(cfqd);
 
 	spin_lock_irq(q->queue_lock);
-
-	if (cfqd->active_queue)
+	
+	if (cfqd->active_queue) {
 		__cfq_slice_expired(cfqd, cfqd->active_queue, 0);
+	}
 
 	while (!list_empty(&cfqd->cic_list)) {
 		struct cfq_io_context *cic = list_entry(cfqd->cic_list.next,
@@ -2031,8 +2031,16 @@ static void cfq_exit_queue(elevator_t *e)
 	kfree(cfqd);
 }
 
-static void *cfq_init_queue(struct request_queue *q)
+static void cfq_exit_queue(elevator_t *e)
 {
+	struct cfq_data *cfqd = e->elevator_data;
+
+	opt.cfq_exit_queue_fn(cfqd);
+}
+
+struct cfq_data *__cfq_init_cfq_data(struct request_queue *q)
+{
+	
 	struct cfq_data *cfqd;
 
 	cfqd = kmalloc_node(sizeof(*cfqd), GFP_KERNEL | __GFP_ZERO, q->node);
@@ -2042,15 +2050,6 @@ static void *cfq_init_queue(struct request_queue *q)
 	cfqd->service_tree = CFQ_RB_ROOT;
 	INIT_LIST_HEAD(&cfqd->cic_list);
 
-	CFQ_DRV_UNIQ_DATA(cfqd).queue = q;
-
-	init_timer(&CFQ_DRV_UNIQ_DATA(cfqd).idle_slice_timer);
-	CFQ_DRV_UNIQ_DATA(cfqd).idle_slice_timer.function = cfq_idle_slice_timer;
-	CFQ_DRV_UNIQ_DATA(cfqd).idle_slice_timer.data = (unsigned long) cfqd;
-
-	INIT_WORK(&CFQ_DRV_UNIQ_DATA(cfqd).unplug_work, cfq_kick_queue);
-
-	CFQ_DRV_UNIQ_DATA(cfqd).last_end_request = jiffies;
 	cfqd->cfq_quantum = cfq_quantum;
 	cfqd->cfq_fifo_expire[0] = cfq_fifo_expire[0];
 	cfqd->cfq_fifo_expire[1] = cfq_fifo_expire[1];
@@ -2059,7 +2058,39 @@ static void *cfq_init_queue(struct request_queue *q)
 	cfqd->cfq_slice[0] = cfq_slice_async;
 	cfqd->cfq_slice[1] = cfq_slice_sync;
 	cfqd->cfq_slice_async_rq = cfq_slice_async_rq;
-	CFQ_DRV_UNIQ_DATA(cfqd).cfq_slice_idle = cfq_slice_idle;
+
+	return cfqd;
+}
+
+#ifndef CONFIG_CGROUP_CFQ
+static struct cfq_data *__cfq_init_queue(struct request_queue *q, void *data)
+{
+	struct cfq_data *cfqd = __cfq_init_cfq_data(q);
+
+	if (!cfqd)
+		return NULL;
+
+	CFQ_DRV_UNIQ_DATA(cfqd).queue = q;
+
+	INIT_WORK(&CFQ_DRV_UNIQ_DATA(cfqd).unplug_work, cfq_kick_queue);
+
+	CFQ_DRV_UNIQ_DATA(cfqd).last_end_request = jiffies;
+
+	init_timer(&CFQ_DRV_UNIQ_DATA(cfqd).idle_slice_timer);
+
+	CFQ_DRV_UNIQ_DATA(cfqd).idle_slice_timer.function = cfq_idle_slice_timer;
+	CFQ_DRV_UNIQ_DATA(cfqd).idle_slice_timer.data = (unsigned long) cfqd;
+	CFQ_DRV_UNIQ_DATA(cfqd).cfq_slice_idle = cfq_slice_idle;	
+
+	return cfqd;
+}
+#endif
+
+static void *cfq_init_queue(struct request_queue *q)
+{
+	struct cfq_data *cfqd = NULL;
+
+	cfqd = opt.cfq_init_queue_fn(q, NULL);
 
 	return cfqd;
 }
@@ -2235,6 +2266,8 @@ module_exit(cfq_exit);
 
 #ifndef CONFIG_CGROUP_CFQ
 struct cfq_ops opt = {
+	.cfq_init_queue_fn = __cfq_init_queue,
+	.cfq_exit_queue_fn = __cfq_exit_data,
 };
 #endif
 
diff --git a/include/linux/cfq-iosched.h b/include/linux/cfq-iosched.h
index 9287da1..e5b41da 100644
--- a/include/linux/cfq-iosched.h
+++ b/include/linux/cfq-iosched.h
@@ -19,8 +19,11 @@ struct cfq_rb_root {
 };
 #define CFQ_RB_ROOT	(struct cfq_rb_root) { RB_ROOT, NULL, }
 
-
+#ifdef CONFIG_CGROUP_CFQ
+#define CFQ_DRV_UNIQ_DATA(cfqd) ((cfqd)->cfqmd->cfq_driv_d)
+#else
 #define CFQ_DRV_UNIQ_DATA(cfqd) ((cfqd)->cfq_driv_d)
+#endif
 
 /*
  * Driver unique data
@@ -45,6 +48,17 @@ struct cfq_driver_data {
 	unsigned int cfq_slice_idle;
 };
 
+#ifdef CONFIG_CGROUP_CFQ
+/*
+ * Per block device group queue structure
+ */
+struct cfq_meta_data {
+	struct cfq_data *elv_data;
+	
+	struct cfq_driver_data cfq_driv_d;
+};
+#endif
+
 /*
  * Per block device queue structure
  */
@@ -75,9 +89,23 @@ struct cfq_data {
 
 	struct list_head cic_list;
 
+#ifdef CONFIG_CGROUP_CFQ
+	struct cfq_meta_data *cfqmd;
+#else
 	struct cfq_driver_data cfq_driv_d;
+#endif
 };
 
+#ifdef CONFIG_CGROUP_CFQ
+static inline struct request_queue * __cfq_container_of_queue(struct work_struct *work) {
+	struct cfq_driver_data *cfqdd = 
+		container_of(work, struct cfq_driver_data, unplug_work);
+	struct cfq_meta_data *cfqmd =
+		container_of(cfqdd, struct cfq_meta_data, cfq_driv_d);
+
+	return cfqmd->cfq_driv_d.queue;
+};
+#else
 static inline struct request_queue * __cfq_container_of_queue(struct work_struct *work) {
 	struct cfq_driver_data *cfqdd = 
 		container_of(work, struct cfq_driver_data, unplug_work);
@@ -86,11 +114,23 @@ static inline struct request_queue * __cfq_container_of_queue(struct work_struct
 
 	return cfqd->cfq_driv_d.queue;
 };
+#endif
+
+typedef struct cfq_data *(cfq_init_queue_fn)(struct request_queue *, void *);
+typedef void (cfq_exit_queue_fn)(struct cfq_data *);
 
 struct cfq_ops
 {
+	cfq_init_queue_fn *cfq_init_queue_fn;
+	cfq_exit_queue_fn *cfq_exit_queue_fn;
 };
 
 extern struct cfq_ops opt;
 
+
+extern struct cfq_data *__cfq_init_cfq_data(struct request_queue *q);
+extern void cfq_kick_queue(struct work_struct *work);
+extern void cfq_idle_slice_timer(unsigned long data);
+extern void __cfq_exit_data(struct cfq_data *cfqd);
+
 #endif  /* _LINUX_CFQ_IOSCHED_H */

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