144 lines
3.6 KiB
C++
144 lines
3.6 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 CACHE_METADATA_H
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#define CACHE_METADATA_H
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#include "block.h"
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#include "array.h"
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#include "endian_utils.h"
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#include "space_map_disk.h"
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#include "transaction_manager.h"
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//----------------------------------------------------------------
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namespace cache {
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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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block_address const SUPERBLOCK_LOCATION = 0;
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typedef uint64_t sector_t;
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//------------------------------------------------
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class space_map_ref_counter {
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public:
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space_map_ref_counter(space_map::ptr sm)
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: sm_(sm) {
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}
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void inc(block_address b) {
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sm_->inc(b);
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}
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void dec(block_address b) {
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sm_->dec(b);
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}
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private:
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space_map::ptr sm_;
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};
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struct block_flags {
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uint64_t block_;
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uint32_t flags_;
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};
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class block_flags_ref_counter {
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public:
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block_flags_ref_counter(space_map::ptr sm)
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: sm_(sm) {
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}
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void inc(block_flags bf) {
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sm_->inc(bf.block_);
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}
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void dec(block_flags bf) {
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sm_->dec(bf.block_);
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}
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private:
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space_map::ptr sm_;
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};
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struct block_traits {
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typedef base::__le64 disk_type;
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typedef block_flags value_type;
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typedef block_flags_ref_counter ref_counter;
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static void unpack(disk_type const &disk, value_type &value) {
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uint64_t v = to_cpu<uint64_t>(disk);
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value.block_ = v >> 24;
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value.flags_ = v & ((1 << 24) - 1);
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}
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static void pack(value_type const &value, disk_type &disk) {
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uint64_t v = (value.block_ << 24) | value.flags_;
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disk = base::to_disk<base::__le64>(v);
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}
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};
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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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typedef persistent_data::btree<1, device_details_traits> detail_tree;
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typedef persistent_data::btree<1, mtree_traits> dev_tree;
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typedef persistent_data::btree<2, block_traits> mapping_tree;
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typedef persistent_data::btree<1, block_traits> single_mapping_tree;
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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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metadata(std::string const &dev_path, open_type ot,
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sector_t data_block_size = 128,
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block_address nr_cache_blocks = 0); // Only used if CREATE
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metadata(std::string const &dev_path, block_address metadata_snap);
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void commit();
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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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tm_ptr tm_;
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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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detail_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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};
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}
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//----------------------------------------------------------------
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#endif
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