dm: use md pending for in flight IO counting

This patch changes the counter for the number of in_flight I/Os
to md->pending from q->in_flight in preparation for a later patch.
No functional change.

Request-based dm used q->in_flight to count the number of in-flight
clones assuming the counter is always incremented for an in-flight
original request and original:clone is 1:1 relationship.
However, it this no longer true for barrier requests.
So use md->pending to count the number of in-flight clones.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 634b1da..01d741a 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -727,23 +727,16 @@ static void end_clone_bio(struct bio *clone, int error)
  * the md may be freed in dm_put() at the end of this function.
  * Or do dm_get() before calling this function and dm_put() later.
  */
-static void rq_completed(struct mapped_device *md, int run_queue)
+static void rq_completed(struct mapped_device *md, int rw, int run_queue)
 {
-       int wakeup_waiters = 0;
-       struct request_queue *q = md->queue;
-       unsigned long flags;
-
-       spin_lock_irqsave(q->queue_lock, flags);
-       if (!queue_in_flight(q))
-               wakeup_waiters = 1;
-       spin_unlock_irqrestore(q->queue_lock, flags);
+       atomic_dec(&md->pending[rw]);
 
        /* nudge anyone waiting on suspend queue */
-       if (wakeup_waiters)
+       if (!md_in_flight(md))
                wake_up(&md->wait);
 
        if (run_queue)
-               blk_run_queue(q);
+               blk_run_queue(md->queue);
 
        /*
         * dm_put() must be at the end of this function. See the comment above
@@ -774,6 +767,7 @@ static void dm_unprep_request(struct request *rq)
  */
 void dm_requeue_unmapped_request(struct request *clone)
 {
+       int rw = rq_data_dir(clone);
        struct dm_rq_target_io *tio = clone->end_io_data;
        struct mapped_device *md = tio->md;
        struct request *rq = tio->orig;
@@ -788,7 +782,7 @@ void dm_requeue_unmapped_request(struct request *clone)
        blk_requeue_request(q, rq);
        spin_unlock_irqrestore(q->queue_lock, flags);
 
-       rq_completed(md, 0);
+       rq_completed(md, rw, 0);
 }
 EXPORT_SYMBOL_GPL(dm_requeue_unmapped_request);
 
@@ -827,6 +821,7 @@ static void start_queue(struct request_queue *q)
  */
 static void dm_end_request(struct request *clone, int error)
 {
+       int rw = rq_data_dir(clone);
        struct dm_rq_target_io *tio = clone->end_io_data;
        struct mapped_device *md = tio->md;
        struct request *rq = tio->orig;
@@ -848,7 +843,7 @@ static void dm_end_request(struct request *clone, int error)
 
        blk_end_request_all(rq, error);
 
-       rq_completed(md, 1);
+       rq_completed(md, rw, 1);
 }
 
 /*
@@ -1541,12 +1536,13 @@ static void dm_request_fn(struct request_queue *q)
        struct mapped_device *md = q->queuedata;
        struct dm_table *map = dm_get_table(md);
        struct dm_target *ti;
-       struct request *rq;
+       struct request *rq, *clone;
 
        /*
-        * For suspend, check blk_queue_stopped() and don't increment
-        * the number of in-flight I/Os after the queue is stopped
-        * in dm_suspend().
+        * For suspend, check blk_queue_stopped() and increment
+        * ->pending within a single queue_lock not to increment the
+        * number of in-flight I/Os after the queue is stopped in
+        * dm_suspend().
         */
        while (!blk_queue_plugged(q) && !blk_queue_stopped(q)) {
                rq = blk_peek_request(q);
@@ -1558,8 +1554,11 @@ static void dm_request_fn(struct request_queue *q)
                        goto plug_and_out;
 
                blk_start_request(rq);
+               clone = rq->special;
+               atomic_inc(&md->pending[rq_data_dir(clone)]);
+
                spin_unlock(q->queue_lock);
-               map_request(ti, rq->special, md);
+               map_request(ti, clone, md);
                spin_lock_irq(q->queue_lock);
        }
 
@@ -2071,8 +2070,6 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
 {
        int r = 0;
        DECLARE_WAITQUEUE(wait, current);
-       struct request_queue *q = md->queue;
-       unsigned long flags;
 
        dm_unplug_all(md->queue);
 
@@ -2082,14 +2079,7 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
                set_current_state(interruptible);
 
                smp_mb();
-               if (dm_request_based(md)) {
-                       spin_lock_irqsave(q->queue_lock, flags);
-                       if (!queue_in_flight(q)) {
-                               spin_unlock_irqrestore(q->queue_lock, flags);
-                               break;
-                       }
-                       spin_unlock_irqrestore(q->queue_lock, flags);
-               } else if (!md_in_flight(md))
+               if (!md_in_flight(md))
                        break;
 
                if (interruptible == TASK_INTERRUPTIBLE &&