105 lines
3.3 KiB
C++
105 lines
3.3 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 METADATA_LL_H
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#define METADATA_LL_H
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#include "base/endian_utils.h"
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#include "persistent-data/block.h"
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#include "persistent-data/data-structures/btree.h"
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#include "persistent-data/space-maps/disk.h"
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#include "persistent-data/transaction_manager.h"
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#include "thin-provisioning/device_tree.h"
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#include "thin-provisioning/mapping_tree.h"
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#include "thin-provisioning/superblock.h"
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//----------------------------------------------------------------
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namespace thin_provisioning {
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// FIXME: don't use namespaces in a header
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using namespace base;
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using namespace persistent_data;
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typedef uint64_t sector_t;
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typedef uint32_t thin_dev_t;
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//------------------------------------------------
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// FIXME: should these be in a sub-namespace?
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typedef persistent_data::transaction_manager::ptr tm_ptr;
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// The tools require different interfaces onto the metadata than
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// the in kernel driver. This class gives access to the low-level
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// implementation of metadata. Implement more specific interfaces
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// on top of this.
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struct metadata {
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enum open_type {
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CREATE,
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OPEN
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};
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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 boost::shared_ptr<metadata> ptr;
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metadata(block_manager<>::ptr bm, open_type ot,
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sector_t data_block_size = 128,
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block_address nr_data_blocks = 0); // Only used if CREATE
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// Ideally we'd like the metadata snap argument to be a
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// boolean, and we'd read the snap location from the
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// superblock. But the command line interface for some of
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// the tools allows the user to pass in a block, which
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// they've retrieved from the pool status. So we have to
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// support 3 cases:
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//
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// i) Read superblock
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// ii) Read the metadata snap as given in the superblock
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// iii) Read the metadata snap given on command line, checking it matches superblock.
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//
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metadata(block_manager<>::ptr bm, bool read_space_maps = true); // (i)
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metadata(block_manager<>::ptr,
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boost::optional<block_address> metadata_snap); // (ii) and (iii)
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// This is used by repair, when we rebuild the superblock
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metadata(block_manager<>::ptr bm, superblock_detail::superblock const &sb);
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void commit();
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tm_ptr tm_;
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superblock_detail::superblock sb_;
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checked_space_map::ptr metadata_sm_;
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checked_space_map::ptr data_sm_;
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device_tree::ptr details_;
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dev_tree::ptr mappings_top_level_;
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mapping_tree::ptr mappings_;
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private:
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void open_space_maps();
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void open_btrees();
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};
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}
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//----------------------------------------------------------------
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#endif
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