Move source into separate sub directories.

persistent-data/transaction_manager.cc

@@ -0,0 +1,122 @@
+// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
+//
+// This file is part of the thin-provisioning-tools source.
+//
+// thin-provisioning-tools is free software: you can redistribute it
+// and/or modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// thin-provisioning-tools is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with thin-provisioning-tools.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+#include "persistent-data/transaction_manager.h"
+
+#include <string.h>
+
+using namespace boost;
+using namespace persistent_data;
+using namespace std;
+
+//----------------------------------------------------------------
+
+transaction_manager::transaction_manager(block_manager<>::ptr bm,
+					 space_map::ptr sm)
+	: bm_(bm),
+	  sm_(sm)
+{
+}
+
+transaction_manager::~transaction_manager()
+{
+}
+
+transaction_manager::write_ref
+transaction_manager::begin(block_address superblock, validator v)
+{
+	write_ref wr = bm_->superblock(superblock, v);
+	wipe_shadow_table();
+	return wr;
+}
+
+transaction_manager::write_ref
+transaction_manager::new_block(validator v)
+{
+	optional<block_address> mb = sm_->new_block();
+	if (!mb)
+		throw runtime_error("couldn't allocate new block");
+
+	sm_decrementer decrementer(sm_, *mb);
+	write_ref wr = bm_->write_lock_zero(*mb, v);
+	add_shadow(*mb);
+	decrementer.dont_bother();
+	return wr;
+}
+
+pair<transaction_manager::write_ref, bool>
+transaction_manager::shadow(block_address orig, validator v)
+{
+	if (is_shadow(orig) &&
+	    !sm_->count_possibly_greater_than_one(orig))
+		return make_pair(bm_->write_lock(orig, v), false);
+
+	read_ref src = bm_->read_lock(orig, v);
+
+	optional<block_address> mb = sm_->new_block();
+	if (!mb)
+		throw runtime_error("couldn't allocate new block");
+
+	write_ref dest = bm_->write_lock_zero(*mb, v);
+	::memcpy(dest.data().raw(), src.data().raw(), MD_BLOCK_SIZE); // FIXME: use buffer copy method
+
+	ref_t count = sm_->get_count(orig);
+	if (count == 0)
+		throw runtime_error("shadowing free block");
+	sm_->dec(orig);
+	add_shadow(dest.get_location());
+	return make_pair(dest, count > 1);
+}
+
+transaction_manager::read_ref
+transaction_manager::read_lock(block_address b)
+{
+	return bm_->read_lock(b);
+}
+
+transaction_manager::read_ref
+transaction_manager::read_lock(block_address b, validator v)
+{
+	return bm_->read_lock(b, v);
+}
+
+void
+transaction_manager::add_shadow(block_address b)
+{
+	shadows_.insert(b);
+}
+
+void
+transaction_manager::remove_shadow(block_address b)
+{
+	shadows_.erase(b);
+}
+
+bool
+transaction_manager::is_shadow(block_address b) const
+{
+	return shadows_.count(b) > 0;
+}
+
+void
+transaction_manager::wipe_shadow_table()
+{
+	shadows_.clear();
+}
+
+//----------------------------------------------------------------