thin-provisioning-tools/thin-provisioning/thin_pool.h

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// 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.
//
// 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/>.
#ifndef MULTISNAP_METADATA_H
#define MULTISNAP_METADATA_H
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#include "metadata.h"
#include <string>
//----------------------------------------------------------------
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namespace thin_provisioning {
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// This interface is very like that in the kernel. It'll allow us
// to write simulators to try out different space maps etc. Not
// currently used by the tools.
class thin_pool;
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class thin {
public:
struct lookup_result {
block_address block_;
bool shared_;
};
typedef std::shared_ptr<thin> ptr;
typedef boost::optional<lookup_result> maybe_address;
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thin_dev_t get_dev_t() const;
maybe_address lookup(block_address thin_block);
bool insert(block_address thin_block, block_address data_block);
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void remove(block_address thin_block);
void set_snapshot_time(uint32_t time);
block_address get_mapped_blocks() const;
void set_mapped_blocks(block_address count);
private:
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friend class thin_pool;
thin(thin_dev_t dev, thin_pool &pool);
thin(thin_dev_t dev, thin_pool &pool,
device_tree_detail::device_details const &details);
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thin_dev_t dev_;
thin_pool &pool_;
device_tree_detail::device_details details_;
uint32_t open_count_;
bool changed_;
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};
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class thin_pool {
public:
typedef std::shared_ptr<thin_pool> ptr;
thin_pool(block_manager::ptr bm);
thin_pool(block_manager::ptr bm,
sector_t data_block_size,
block_address nr_data_blocks);
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~thin_pool();
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void create_thin(thin_dev_t dev);
void create_snap(thin_dev_t dev, thin_dev_t origin);
void del(thin_dev_t);
void commit();
void set_transaction_id(uint64_t id);
uint64_t get_transaction_id() const;
// handling metadata snapshot
void reserve_metadata_snap();
void release_metadata_snap();
block_address get_metadata_snap() const;
block_address alloc_data_block();
void free_data_block(block_address b);
// accessors
block_address get_nr_free_data_blocks() const;
sector_t get_data_block_size() const;
block_address get_data_dev_size() const;
uint32_t get_time() const;
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thin::ptr open_thin(thin_dev_t);
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void close_thin(thin::ptr td);
// updates the superblock
void set_needs_check();
private:
friend class thin;
typedef std::map<thin_dev_t, thin::ptr> device_map;
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bool device_exists(thin_dev_t dev) const;
thin::ptr create_device(thin_dev_t dev);
thin::ptr open_device(thin_dev_t dev);
void close_device(thin::ptr device);
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void set_snapshot_details(thin::ptr snap, thin_dev_t origin);
void write_changed_details();
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metadata::ptr md_;
device_map thin_devices_;
};
void process_read(thin::ptr td, thin_pool::ptr tp, sector_t offset);
void process_write(thin::ptr td, thin_pool::ptr tp, sector_t offset);
void process_discard(thin::ptr td, thin_pool::ptr tp, sector_t offset);
};
//----------------------------------------------------------------
#endif