md/bitmap: use sector_div for sector_t divisions

neilb: modified to not corrupt ->resync_max_sectors.

sector_div usage fixed by Guoqing Jiang <gqjiang@suse.com>

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 03e0752af99f..ac79fef68143 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -571,9 +571,10 @@ static int bitmap_read_sb(struct bitmap *bitmap)
 re_read:
         /* If cluster_slot is set, the cluster is setup */
         if (bitmap->cluster_slot >= 0) {
-                sector_t bm_blocks;
+                sector_t bm_blocks = bitmap->mddev->resync_max_sectors;
 
-                bm_blocks = bitmap->mddev->resync_max_sectors / (bitmap->mddev->bitmap_info.chunksize >> 9);
+                sector_div(bm_blocks,
+                           bitmap->mddev->bitmap_info.chunksize >> 9);
                 bm_blocks = bm_blocks << 3;
                 bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096);
                 bitmap->mddev->bitmap_info.offset += bitmap->cluster_slot * (bm_blocks << 3);