Retain badblocks as part of rdev, but use the accessor functions from
include/linux/badblocks for all manipulation.

Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
 drivers/md/md.c | 507 +++-----------------------------------------------------
 drivers/md/md.h |  40 +----
 2 files changed, 23 insertions(+), 524 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index c702de1..63eab20 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c

@@ -34,6 +34,7 @@
 
 #include <linux/kthread.h>
 #include <linux/blkdev.h>
+#include <linux/badblocks.h>
 #include <linux/sysctl.h>
 #include <linux/seq_file.h>
 #include <linux/fs.h>

@@ -707,8 +708,7 @@ void md_rdev_clear(struct md_rdev *rdev)
 		put_page(rdev->bb_page);
 		rdev->bb_page = NULL;
 	}
-	kfree(rdev->badblocks.page);
-	rdev->badblocks.page = NULL;
+	badblocks_free(&rdev->badblocks);
 }