From 93468190bd4c9ed7551d359b549f024ba1f75142 Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Mon, 1 Sep 2014 14:17:44 +0100
Subject: [PATCH] [bitset] When reopening a bitset some bits could be lost at
 the far end.

The number of words necessary to store the bits was being miscalculated.
---
 persistent-data/data-structures/bitset.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/persistent-data/data-structures/bitset.cc b/persistent-data/data-structures/bitset.cc
index fae1f34..b0d9e34 100644
--- a/persistent-data/data-structures/bitset.cc
+++ b/persistent-data/data-structures/bitset.cc
@@ -40,7 +40,7 @@ namespace persistent_data {
 
 			bitset_impl(transaction_manager &tm, block_address root, unsigned nr_bits)
 				: nr_bits_(nr_bits),
-				  array_(tm, rc_, root, nr_bits / BITS_PER_ULL) {
+				  array_(tm, rc_, root, div_up<unsigned>(nr_bits, BITS_PER_ULL)) {
 			}
 
 			block_address get_root() const {