Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6

[linux-2.6] / drivers / md / multipath.c

diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index e4f168d063db3619cf9a9c93681d675b4ec15271..171ff41b52b053e7acdc2f6c78e0ef34ed2bd695 100644 (file)
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -228,6 +228,28 @@ static int multipath_issue_flush(request_queue_t *q, struct gendisk *disk,
        rcu_read_unlock();
        return ret;
 }
+static int multipath_congested(void *data, int bits)
+{
+       mddev_t *mddev = data;
+       multipath_conf_t *conf = mddev_to_conf(mddev);
+       int i, ret = 0;
+
+       rcu_read_lock();
+       for (i = 0; i < mddev->raid_disks ; i++) {
+               mdk_rdev_t *rdev = rcu_dereference(conf->multipaths[i].rdev);
+               if (rdev && !test_bit(Faulty, &rdev->flags)) {
+                       request_queue_t *q = bdev_get_queue(rdev->bdev);
+
+                       ret |= bdi_congested(&q->backing_dev_info, bits);
+                       /* Just like multipath_map, we just check the
+                        * first available device
+                        */
+                       break;
+               }
+       }
+       rcu_read_unlock();
+       return ret;
+}
 
 /*
  * Careful, this can execute in IRQ contexts as well!
@@ -509,6 +531,8 @@ static int multipath_run (mddev_t *mddev)
 
        mddev->queue->unplug_fn = multipath_unplug;
        mddev->queue->issue_flush_fn = multipath_issue_flush;
+       mddev->queue->backing_dev_info.congested_fn = multipath_congested;
+       mddev->queue->backing_dev_info.congested_data = mddev;
 
        return 0;