diff --git a/drivers/md/faulty.c b/drivers/md/faulty.c
index d76c87f2a8318f0ef44100ae8f8d65e7843d311c..8695809b24b05f049c13a3dc667bf2a02d9b4ba6 100644
--- a/drivers/md/faulty.c
+++ b/drivers/md/faulty.c
@@ -312,7 +312,7 @@ static int run(mddev_t *mddev)
 	list_for_each_entry(rdev, &mddev->disks, same_set)
 		conf->rdev = rdev;
 
-	mddev->array_sectors = faulty_size(mddev, 0, 0);
+	md_set_array_sectors(mddev, faulty_size(mddev, 0, 0));
 	mddev->private = conf;
 
 	reconfig(mddev, mddev->layout, -1);
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index b6bb976123daaa0cf765818f07e5c6a1549570a0..7a36e38393a1e9ff24defd03c756138a9f5da903 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -263,7 +263,7 @@ static int linear_run (mddev_t *mddev)
 	if (!conf)
 		return 1;
 	mddev->private = conf;
-	mddev->array_sectors = linear_size(mddev, 0, 0);
+	md_set_array_sectors(mddev, linear_size(mddev, 0, 0));
 
 	blk_queue_merge_bvec(mddev->queue, linear_mergeable_bvec);
 	mddev->queue->unplug_fn = linear_unplug;
@@ -297,7 +297,7 @@ static int linear_add(mddev_t *mddev, mdk_rdev_t *rdev)
 	newconf->prev = mddev_to_conf(mddev);
 	mddev->private = newconf;
 	mddev->raid_disks++;
-	mddev->array_sectors = linear_size(mddev, 0, 0);
+	md_set_array_sectors(mddev, linear_size(mddev, 0, 0));
 	set_capacity(mddev->gendisk, mddev->array_sectors);
 	return 0;
 }
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0689d89d263c21eb2be4df5b6e29e866fef9511e..76ba69b31d6a1f3e1fec28cb8acb319e37c63a1b 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4977,6 +4977,12 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
 	return 0;
 }
 
+void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
+{
+	mddev->array_sectors = array_sectors;
+}
+EXPORT_SYMBOL(md_set_array_sectors);
+
 static int update_size(mddev_t *mddev, sector_t num_sectors)
 {
 	mdk_rdev_t *rdev;
diff --git a/drivers/md/md.h b/drivers/md/md.h
index d2c50da1ae7fd47f874a071258b6859498addba8..ce89dda24074ed150d3d78f65952438c55e3f5d7 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -430,3 +430,4 @@ extern void md_do_sync(mddev_t *mddev);
 extern void md_new_event(mddev_t *mddev);
 extern int md_allow_write(mddev_t *mddev);
 extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
+extern void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors);
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index a3f6d8668bb35af437514ea851dfee8173e3f96b..41ced0cbe823c7275cc2f79172cc9913385fcd2f 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -510,7 +510,7 @@ static int multipath_run (mddev_t *mddev)
 	/*
 	 * Ok, everything is just fine now
 	 */
-	mddev->array_sectors = multipath_size(mddev, 0, 0);
+	md_set_array_sectors(mddev, multipath_size(mddev, 0, 0));
 
 	mddev->queue->unplug_fn = multipath_unplug;
 	mddev->queue->backing_dev_info.congested_fn = multipath_congested;
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index bb0df6a18443c4291235f96406668ff8cb3bb94a..6f7e538c8763434d67605ef5830e00cdacf81795 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -306,7 +306,7 @@ static int raid0_run (mddev_t *mddev)
 		goto out_free_conf;
 
 	/* calculate array device size */
-	mddev->array_sectors = raid0_size(mddev, 0, 0);
+	md_set_array_sectors(mddev, raid0_size(mddev, 0, 0));
 
 	printk(KERN_INFO "raid0 : md_size is %llu sectors.\n",
 		(unsigned long long)mddev->array_sectors);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index a2a83b0d5a95fbcf3e320de16d77a2bbea851329..044116b53f7a2ef63d1fff9e8bad63bb79cc6ca1 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2059,7 +2059,7 @@ static int run(mddev_t *mddev)
 	/*
 	 * Ok, everything is just fine now
 	 */
-	mddev->array_sectors = raid1_size(mddev, 0, 0);
+	md_set_array_sectors(mddev, raid1_size(mddev, 0, 0));
 
 	mddev->queue->unplug_fn = raid1_unplug;
 	mddev->queue->backing_dev_info.congested_fn = raid1_congested;
@@ -2124,7 +2124,7 @@ static int raid1_resize(mddev_t *mddev, sector_t sectors)
 	 * any io in the removed space completes, but it hardly seems
 	 * worth it.
 	 */
-	mddev->array_sectors = raid1_size(mddev, sectors, 0);
+	md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0));
 	set_capacity(mddev->gendisk, mddev->array_sectors);
 	mddev->changed = 1;
 	if (mddev->array_sectors > mddev->dev_sectors &&
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 5bf1b24ae802d9e64e5fe82534268d9865b5059d..ad153b24ea0de4bbee717a50b417b7716643126f 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2193,7 +2193,7 @@ static int run(mddev_t *mddev)
 	/*
 	 * Ok, everything is just fine now
 	 */
-	mddev->array_sectors = raid10_size(mddev, 0, 0);
+	md_set_array_sectors(mddev, raid10_size(mddev, 0, 0));
 	mddev->resync_max_sectors = mddev->array_sectors;
 
 	mddev->queue->unplug_fn = raid10_unplug;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 2cd619ff07614cef56d781f31ebd23c76bf76a54..2930fc26a852d94336acae8cf10a8c980a69c501 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4474,7 +4474,7 @@ static int run(mddev_t *mddev)
 	mddev->queue->backing_dev_info.congested_data = mddev;
 	mddev->queue->backing_dev_info.congested_fn = raid5_congested;
 
-	mddev->array_sectors = raid5_size(mddev, 0, 0);
+	md_set_array_sectors(mddev, raid5_size(mddev, 0, 0));
 
 	blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec);
 
@@ -4698,7 +4698,8 @@ static int raid5_resize(mddev_t *mddev, sector_t sectors)
 	 * worth it.
 	 */
 	sectors &= ~((sector_t)mddev->chunk_size/512 - 1);
-	mddev->array_sectors = raid5_size(mddev, sectors, mddev->raid_disks);
+	md_set_array_sectors(mddev, raid5_size(mddev, sectors,
+					       mddev->raid_disks));
 	set_capacity(mddev->gendisk, mddev->array_sectors);
 	mddev->changed = 1;
 	if (sectors > mddev->dev_sectors && mddev->recovery_cp == MaxSector) {
@@ -4836,7 +4837,8 @@ static void end_reshape(raid5_conf_t *conf)
 	if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) {
 		mddev_t *mddev = conf->mddev;
 
-		mddev->array_sectors = raid5_size(mddev, 0, conf->raid_disks);
+		md_set_array_sectors(mddev, raid5_size(mddev, 0,
+						       conf->raid_disks));
 		set_capacity(mddev->gendisk, mddev->array_sectors);
 		mddev->changed = 1;
 		conf->previous_raid_disks = conf->raid_disks;