[cache_restore] more wip

caching/metadata.cc

@@ -1,17 +1,80 @@
 #include "caching/metadata.h"
+#include "persistent-data/space-maps/core.h"
 
 using namespace caching;
 
 //----------------------------------------------------------------
 
-metadata::metadata(block_manager<>::ptr bm, open_type ot)
-{
+namespace {
+	using namespace superblock_detail;
 
-}
+	unsigned const METADATA_CACHE_SIZE = 1024;
 
-metadata::metadata(block_manager<>::ptr bm, block_address metadata_snap)
-{
+	// FIXME: duplication
+	transaction_manager::ptr
+	open_tm(block_manager<>::ptr bm) {
+		space_map::ptr sm(new core_map(bm->get_nr_blocks()));
+		sm->inc(SUPERBLOCK_LOCATION);
+		transaction_manager::ptr tm(new transaction_manager(bm, sm));
+		return tm;
+	}
 
+	void
+	copy_space_maps(space_map::ptr lhs, space_map::ptr rhs) {
+		for (block_address b = 0; b < rhs->get_nr_blocks(); b++) {
+			uint32_t count = rhs->get_count(b);
+			if (count > 0)
+				lhs->set_count(b, rhs->get_count(b));
+		}
+	}
+
+	void init_superblock(superblock &sb) {
+#if 0
+		sb.magic_ = SUPERBLOCK_MAGIC;
+		sb.version_ = 1;
+		sb.data_mapping_root_ = mappings_->get_root();
+		sb.device_details_root_ = details_->get_root();
+		sb.data_block_size_ = data_block_size;
+		sb.metadata_block_size_ = MD_BLOCK_SIZE;
+		sb.metadata_nr_blocks_ = tm_->get_bm()->get_nr_blocks();
+#endif
+	}
+}
+
+//----------------------------------------------------------------
+
+metadata::metadata(block_manager<>::ptr bm, open_type ot)
+{
+	switch (ot) {
+	case OPEN:
+		throw runtime_error("not implemented");
+		break;
+
+	case CREATE:
+		tm_ = open_tm(bm);
+		space_map::ptr core = tm_->get_sm();
+		metadata_sm_ = create_metadata_sm(tm_, tm_->get_bm()->get_nr_blocks());
+		copy_space_maps(metadata_sm_, core);
+		tm_->set_sm(metadata_sm_);
+
+		mappings_ = mapping_array::ptr(new mapping_array(tm_, mapping_array::ref_counter()));
+//		hints_ = hint_array::ptr(new hint_array(tm_));
+
+		::memset(&sb_, 0, sizeof(sb_));
+		init_superblock(sb_);
+	}
+}
+
+void
+metadata::commit()
+{
+	metadata_sm_->commit();
+	metadata_sm_->copy_root(&sb_.metadata_space_map_root, sizeof(sb_.metadata_space_map_root));
+	sb_.mapping_root = mappings_->get_root();
+
+	write_ref superblock = tm_->get_bm()->superblock_zero(SUPERBLOCK_LOCATION, superblock_validator());
+	superblock_disk *disk = reinterpret_cast<superblock_disk *>(superblock.data().raw());
+	superblock_traits::pack(sb_, *disk);
 }
 
 //----------------------------------------------------------------