block: Seperate read and write statistics of in_flight requests v2

[deliverable/linux.git] / drivers / md / dm.c

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 23e76fe0d35958d604657a559a5954095854bf23..376f1ab48a245fcdce521bd55a7ceb109f7f8c9e 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -130,7 +130,7 @@ struct mapped_device {
        /*
         * A list of ios that arrived while we were suspended.
         */
-       atomic_t pending;
+       atomic_t pending[2];
        wait_queue_head_t wait;
        struct work_struct work;
        struct bio_list deferred;
@@ -453,13 +453,14 @@ static void start_io_acct(struct dm_io *io)
 {
        struct mapped_device *md = io->md;
        int cpu;
+       int rw = bio_data_dir(io->bio);
 
        io->start_time = jiffies;
 
        cpu = part_stat_lock();
        part_round_stats(cpu, &dm_disk(md)->part0);
        part_stat_unlock();
-       dm_disk(md)->part0.in_flight = atomic_inc_return(&md->pending);
+       dm_disk(md)->part0.in_flight[rw] = atomic_inc_return(&md->pending[rw]);
 }
 
 static void end_io_acct(struct dm_io *io)
@@ -479,8 +480,9 @@ static void end_io_acct(struct dm_io *io)
         * After this is decremented the bio must not be touched if it is
         * a barrier.
         */
-       dm_disk(md)->part0.in_flight = pending =
-               atomic_dec_return(&md->pending);
+       dm_disk(md)->part0.in_flight[rw] = pending =
+               atomic_dec_return(&md->pending[rw]);
+       pending += atomic_read(&md->pending[rw^0x1]);
 
        /* nudge anyone waiting on suspend queue */
        if (!pending)
@@ -1785,7 +1787,8 @@ static struct mapped_device *alloc_dev(int minor)
        if (!md->disk)
                goto bad_disk;
 
-       atomic_set(&md->pending, 0);
+       atomic_set(&md->pending[0], 0);
+       atomic_set(&md->pending[1], 0);
        init_waitqueue_head(&md->wait);
        INIT_WORK(&md->work, dm_wq_work);
        init_waitqueue_head(&md->eventq);
@@ -2088,7 +2091,8 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
                                break;
                        }
                        spin_unlock_irqrestore(q->queue_lock, flags);
-               } else if (!atomic_read(&md->pending))
+               } else if (!atomic_read(&md->pending[0]) &&
+                                       !atomic_read(&md->pending[1]))
                        break;
 
                if (interruptible == TASK_INTERRUPTIBLE &&