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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>
This commit is contained in:
Stephen Rothwell 2015-03-03 13:35:31 +11:00 committed by NeilBrown
parent 935f3d4fc6
commit 3b0e6aacbf
1 changed files with 3 additions and 2 deletions
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5
drivers/md/bitmap.c
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@ -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);