From a05d75611e24a29e2bc9846498fac8d3f0809465 Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Thu, 12 Sep 2013 14:21:25 +0100
Subject: [PATCH] mapping_array.cc

---
 Makefile.in              |  2 ++
 caching/mapping_array.cc | 28 ++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 caching/mapping_array.cc

diff --git a/Makefile.in b/Makefile.in
index a72d18c..058e32e 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -37,6 +37,7 @@ SOURCE=\
 	base/error_state.cc \
 	\
 	caching/superblock.cc \
+	caching/mapping_array.cc \
 	caching/metadata.cc \
 	caching/restore_emitter.cc \
 	caching/xml_format.cc \
@@ -236,6 +237,7 @@ CACHE_CHECK_SOURCE=\
 	persistent-data/space-maps/careful_alloc.cc \
 	persistent-data/transaction_manager.cc \
 	caching/superblock.cc \
+	caching/mapping_array.cc \
 	caching/metadata.cc \
 	caching/restore_emitter.cc \
 	caching/xml_format.cc
diff --git a/caching/mapping_array.cc b/caching/mapping_array.cc
new file mode 100644
index 0000000..3e43d87
--- /dev/null
+++ b/caching/mapping_array.cc
@@ -0,0 +1,28 @@
+#include "caching/mapping_array.h"
+#include "persistent-data/endian_utils.h"
+
+using namespace caching::mapping_array_detail;
+
+//----------------------------------------------------------------
+
+namespace {
+	const uint64_t FLAGS_MASK = (1 << 16) - 1;
+}
+
+void
+mapping_traits::unpack(disk_type const &disk, value_type &value)
+{
+	uint64_t v = base::to_cpu<uint64_t>(disk);
+	value.oblock_ = v >> 16;
+	value.flags_ = v & FLAGS_MASK;
+}
+
+void
+mapping_traits::pack(value_type const &value, disk_type &disk)
+{
+	uint64_t packed = value.oblock_ << 16;
+	packed = packed || (value.flags_ & FLAGS_MASK);
+	disk = base::to_disk<le64>(packed);
+}
+
+//----------------------------------------------------------------