md: move io accounting out of personalities into md_make_request

While I generally prefer letting personalities do as much as possible,
given that we have a central md_make_request anyway we may as well use
it to simplify code.
Also this centralises knowledge of ->gendisk which will help later.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index c5a1b0725c9f..117663d2a4e5 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -214,8 +214,11 @@ static DEFINE_SPINLOCK(all_mddevs_lock);
  */
 static int md_make_request(struct request_queue *q, struct bio *bio)
 {
+        const int rw = bio_data_dir(bio);
         mddev_t *mddev = q->queuedata;
         int rv;
+        int cpu;
+
         if (mddev == NULL || mddev->pers == NULL) {
                 bio_io_error(bio);
                 return 0;
@@ -236,7 +239,15 @@ static int md_make_request(struct request_queue *q, struct bio *bio)
         }
         atomic_inc(&mddev->active_io);
         rcu_read_unlock();
+
         rv = mddev->pers->make_request(q, bio);
+
+        cpu = part_stat_lock();
+        part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
+        part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
+                      bio_sectors(bio));
+        part_stat_unlock();
+
         if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
                 wake_up(&mddev->sb_wait);