96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
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//
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// thin-provisioning-tools is free software: you can redistribute it
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// and/or modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// thin-provisioning-tools is distributed in the hope that it will be
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// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with thin-provisioning-tools. If not, see
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// <http://www.gnu.org/licenses/>.
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#ifndef TRANSACTION_MANAGER_H
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#define TRANSACTION_MANAGER_H
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#include "block.h"
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#include "space_map.h"
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#include <set>
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//----------------------------------------------------------------
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namespace persistent_data {
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class transaction_manager : boost::noncopyable {
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public:
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typedef std::shared_ptr<transaction_manager> ptr;
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typedef block_manager::read_ref read_ref;
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typedef block_manager::write_ref write_ref;
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typedef bcache::validator::ptr validator;
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// If the space map is persistent, then the caller should
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// hold onto a reference and remember to call sm_->commit()
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// and update the superblock before dropping the superblock
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// reference.
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transaction_manager(block_manager::ptr bm,
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space_map::ptr sm);
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~transaction_manager();
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void commit();
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// Drop the superblock reference to commit
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write_ref begin(block_address superblock, validator v);
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write_ref new_block(validator v);
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// shadowing returns a new write_ref, and a boolean which
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// indicates whether the children should be incremented.
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std::pair<write_ref, bool> shadow(block_address orig, validator v);
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read_ref read_lock(block_address b);
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read_ref read_lock(block_address b, validator v);
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space_map::ptr get_sm() {
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return sm_;
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}
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void set_sm(space_map::ptr sm) {
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sm_ = sm;
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}
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block_manager::ptr get_bm() {
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return bm_;
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}
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void prefetch(block_address b) {
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bm_->prefetch(b);
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}
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// mark a block as shadowed,
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// for the purpose of in-place modification
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void mark_shadowed(block_address b) {
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add_shadow(b);
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}
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private:
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void add_shadow(block_address b);
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void remove_shadow(block_address b);
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bool is_shadow(block_address b) const;
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void wipe_shadow_table();
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block_manager::ptr bm_;
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space_map::ptr sm_;
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std::set<block_address> shadows_;
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};
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}
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//----------------------------------------------------------------
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#endif
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