diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index ac79fef681434938ce872fb6b9ce54548853da65..e98db04eb4f9b108973d003db355895d00dbfc2c 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -575,7 +575,9 @@ static int bitmap_read_sb(struct bitmap *bitmap)
 
 		sector_div(bm_blocks,
 			   bitmap->mddev->bitmap_info.chunksize >> 9);
-		bm_blocks = bm_blocks << 3;
+		/* bits to bytes */
+		bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t);
+		/* to 4k blocks */
 		bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096);
 		bitmap->mddev->bitmap_info.offset += bitmap->cluster_slot * (bm_blocks << 3);
 		pr_info("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__,
@@ -672,9 +674,6 @@ static int bitmap_read_sb(struct bitmap *bitmap)
 			goto out_no_sb;
 		}
 		bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev);
-		pr_info("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__,
-			bitmap->cluster_slot,
-			(unsigned long long)bitmap->mddev->bitmap_info.offset);
 		goto re_read;
 	}