[dm-devel] [PATCH v3 2/8] md/bitmap: use DIV_ROUND_UP in bitmap_init_from_disk

[Mike Snitzer <snitzer redhat com>]

From: NeilBrown <neilb suse de>

Keep DIV_ROUND_UP changes from e384e58549a2e9a83071ad80280c1a9053cfd84c
  md/bitmap: prepare for storing write-intent-bitmap via dm-dirty-log.

Signed-off-by: NeilBrown <neilb suse de>
Signed-off-by: Jonathan Brassow <jbrassow redhat com>
Signed-off-by: Mike Snitzer <snitzer redhat com>
---
 drivers/md/bitmap.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 2eb51cd..f3f5edc 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -925,11 +925,11 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
 		printk(KERN_INFO "%s: bitmap file is out of date, doing full "
 			"recovery\n", bmname(bitmap));
 
-	bytes = (chunks + 7) / 8;
+	bytes = DIV_ROUND_UP(bitmap->chunks, 8);
 	if (!bitmap->mddev->bitmap_info.external)
 		bytes += sizeof(bitmap_super_t);
 
-	num_pages = (bytes + PAGE_SIZE - 1) / PAGE_SIZE;
+	num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
 
 	if (file && i_size_read(file->f_mapping->host) < bytes) {
 		printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n",
-- 
1.7.2.3