1 files changed, 49 insertions, 2 deletions

diff --git a/block/blk.h b/block/blk.h
index 79c85f7c9ff5..3fae6add5430 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -13,6 +13,9 @@ extern struct kobj_type blk_queue_ktype;
 void init_request_from_bio(struct request *req, struct bio *bio);
 void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
                         struct bio *bio);
+int blk_rq_append_bio(struct request_queue *q, struct request *rq,
+                      struct bio *bio);
+void blk_dequeue_request(struct request *rq);
 void __blk_queue_free_tags(struct request_queue *q);
 
 void blk_unplug_work(struct work_struct *work);
@@ -43,6 +46,43 @@ static inline void blk_clear_rq_complete(struct request *rq)
         clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
 }
 
+/*
+ * Internal elevator interface
+ */
+#define ELV_ON_HASH(rq)         (!hlist_unhashed(&(rq)->hash))
+
+static inline struct request *__elv_next_request(struct request_queue *q)
+{
+        struct request *rq;
+
+        while (1) {
+                while (!list_empty(&q->queue_head)) {
+                        rq = list_entry_rq(q->queue_head.next);
+                        if (blk_do_ordered(q, &rq))
+                                return rq;
+                }
+
+                if (!q->elevator->ops->elevator_dispatch_fn(q, 0))
+                        return NULL;
+        }
+}
+
+static inline void elv_activate_rq(struct request_queue *q, struct request *rq)
+{
+        struct elevator_queue *e = q->elevator;
+
+        if (e->ops->elevator_activate_req_fn)
+                e->ops->elevator_activate_req_fn(q, rq);
+}
+
+static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq)
+{
+        struct elevator_queue *e = q->elevator;
+
+        if (e->ops->elevator_deactivate_req_fn)
+                e->ops->elevator_deactivate_req_fn(q, rq);
+}
+
 #ifdef CONFIG_FAIL_IO_TIMEOUT
 int blk_should_fake_timeout(struct request_queue *);
 ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
@@ -64,7 +104,6 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
 int attempt_back_merge(struct request_queue *q, struct request *rq);
 int attempt_front_merge(struct request_queue *q, struct request *rq);
 void blk_recalc_rq_segments(struct request *rq);
-void blk_recalc_rq_sectors(struct request *rq, int nsect);
 
 void blk_queue_congestion_threshold(struct request_queue *q);
 
@@ -112,9 +151,17 @@ static inline int blk_cpu_to_group(int cpu)
 #endif
 }
 
+/*
+ * Contribute to IO statistics IFF:
+ *
+ *      a) it's attached to a gendisk, and
+ *      b) the queue had IO stats enabled when this request was started, and
+ *      c) it's a file system request or a discard request
+ */
 static inline int blk_do_io_stat(struct request *rq)
 {
-        return rq->rq_disk && blk_rq_io_stat(rq);
+        return rq->rq_disk && blk_rq_io_stat(rq) &&
+               (blk_fs_request(rq) || blk_discard_rq(rq));
 }
 
 #endif