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md/bitmap: use DIV_ROUND_UP instead of open-code 

Also take the opportunity to simplify CHUNK_BLOCK_RATIO.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2012-05-22 13:55:25 +10:00
parent 40cffcc0e8
commit 15702d7fb6
1 changed files with 2 additions and 3 deletions
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5
drivers/md/bitmap.c
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@ -1694,9 +1694,8 @@ int bitmap_create(struct mddev *mddev)
bitmap->counts.chunkshift = (ffz(~mddev->bitmap_info.chunksize)
- BITMAP_BLOCK_SHIFT);
chunks = (blocks + (1 << bitmap->counts.chunkshift) - 1) >>
bitmap->counts.chunkshift;
pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO;
chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << bitmap->counts.chunkshift);
pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO);
BUG_ON(!pages);