[PATCH 1/2] [md/bitmap] md_bitmap_read_sb use wrong bitmap blocks

[Zhao Heming <heming.zhao@xxxxxxxx>]

The patched code is used to get chunks number, should use
round-up div to replace current sector_div.
The same code is in md_bitmap_resize():
```
chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift);
```

Signed-off-by: Zhao Heming <heming.zhao@xxxxxxxx>
---
 drivers/md/md-bitmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 593fe15..1efd2b4 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -605,7 +605,7 @@ static int md_bitmap_read_sb(struct bitmap *bitmap)
 	if (bitmap->cluster_slot >= 0) {
 		sector_t bm_blocks = bitmap->mddev->resync_max_sectors;
 
-		sector_div(bm_blocks,
+		DIV_ROUND_UP_SECTOR_T(bm_blocks,
 			   bitmap->mddev->bitmap_info.chunksize >> 9);
 		/* bits to bytes */
 		bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t);
-- 
1.8.3.1