205 lines
7.2 KiB
C++
205 lines
7.2 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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#include "thin-provisioning/device_tree.h"
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#include "thin-provisioning/metadata.h"
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#include "persistent-data/file_utils.h"
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#include "persistent-data/math_utils.h"
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#include "persistent-data/space-maps/core.h"
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#include "persistent-data/space-maps/disk.h"
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#include <linux/fs.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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using namespace base;
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using namespace thin_provisioning;
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//----------------------------------------------------------------
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namespace {
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using namespace superblock_detail;
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unsigned const METADATA_CACHE_SIZE = 1024;
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transaction_manager::ptr
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open_tm(block_manager<>::ptr bm) {
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space_map::ptr sm(new core_map(bm->get_nr_blocks()));
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sm->inc(SUPERBLOCK_LOCATION);
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transaction_manager::ptr tm(new transaction_manager(bm, sm));
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return tm;
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}
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void
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copy_space_maps(space_map::ptr lhs, space_map::ptr rhs) {
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for (block_address b = 0; b < rhs->get_nr_blocks(); b++) {
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uint32_t count = rhs->get_count(b);
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if (count > 0)
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lhs->set_count(b, rhs->get_count(b));
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}
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}
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}
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//----------------------------------------------------------------
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metadata::metadata(std::string const &dev_path, open_type ot,
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sector_t data_block_size, block_address nr_data_blocks)
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{
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switch (ot) {
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case OPEN:
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tm_ = open_tm(open_bm(dev_path, block_manager<>::READ_ONLY));
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sb_ = read_superblock(tm_->get_bm());
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if (sb_.version_ != 1)
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throw runtime_error("unknown metadata version");
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metadata_sm_ = open_metadata_sm(*tm_, &sb_.metadata_space_map_root_);
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tm_->set_sm(metadata_sm_);
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data_sm_ = open_disk_sm(*tm_, static_cast<void *>(&sb_.data_space_map_root_));
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details_ = device_tree::ptr(
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new device_tree(*tm_, sb_.device_details_root_,
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device_tree_detail::device_details_traits::ref_counter()));
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mappings_top_level_ = dev_tree::ptr(
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new dev_tree(*tm_, sb_.data_mapping_root_,
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mapping_tree_detail::mtree_ref_counter(tm_)));
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mappings_ = mapping_tree::ptr(
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new mapping_tree(*tm_, sb_.data_mapping_root_,
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mapping_tree_detail::block_time_ref_counter(data_sm_)));
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break;
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case CREATE:
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tm_ = open_tm(open_bm(dev_path, block_manager<>::READ_WRITE));
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space_map::ptr core = tm_->get_sm();
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metadata_sm_ = create_metadata_sm(*tm_, tm_->get_bm()->get_nr_blocks());
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copy_space_maps(metadata_sm_, core);
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tm_->set_sm(metadata_sm_);
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data_sm_ = create_disk_sm(*tm_, nr_data_blocks);
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details_ = device_tree::ptr(new device_tree(*tm_, device_tree_detail::device_details_traits::ref_counter()));
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mappings_ = mapping_tree::ptr(new mapping_tree(*tm_,
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mapping_tree_detail::block_time_ref_counter(data_sm_)));
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mappings_top_level_ = dev_tree::ptr(new dev_tree(*tm_, mappings_->get_root(),
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mapping_tree_detail::mtree_ref_counter(tm_)));
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::memset(&sb_, 0, sizeof(sb_));
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sb_.magic_ = SUPERBLOCK_MAGIC;
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sb_.version_ = 1;
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sb_.data_mapping_root_ = mappings_->get_root();
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sb_.device_details_root_ = details_->get_root();
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sb_.data_block_size_ = data_block_size;
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sb_.metadata_block_size_ = MD_BLOCK_SIZE;
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sb_.metadata_nr_blocks_ = tm_->get_bm()->get_nr_blocks();
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break;
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}
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}
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metadata::metadata(std::string const &dev_path, block_address metadata_snap)
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{
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tm_ = open_tm(open_bm(dev_path, block_manager<>::READ_ONLY, !metadata_snap));
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sb_ = read_superblock(tm_->get_bm(), metadata_snap);
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// We don't open the metadata sm for a held root
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//metadata_sm_ = open_metadata_sm(tm_, &sb_.metadata_space_map_root_);
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//tm_->set_sm(metadata_sm_);
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data_sm_ = open_disk_sm(*tm_, static_cast<void *>(&sb_.data_space_map_root_));
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details_ = device_tree::ptr(new device_tree(*tm_, sb_.device_details_root_, device_tree_detail::device_details_traits::ref_counter()));
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mappings_top_level_ = dev_tree::ptr(new dev_tree(*tm_, sb_.data_mapping_root_,
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mapping_tree_detail::mtree_ref_counter(tm_)));
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mappings_ = mapping_tree::ptr(new mapping_tree(*tm_, sb_.data_mapping_root_,
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mapping_tree_detail::block_time_ref_counter(data_sm_)));
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}
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// FIXME: duplication
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metadata::metadata(block_manager<>::ptr bm, open_type ot,
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sector_t data_block_size,
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block_address nr_data_blocks)
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{
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switch (ot) {
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case OPEN:
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tm_ = open_tm(bm);
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sb_ = read_superblock(tm_->get_bm());
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if (sb_.version_ != 1)
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throw runtime_error("unknown metadata version");
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metadata_sm_ = open_metadata_sm(*tm_, &sb_.metadata_space_map_root_);
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tm_->set_sm(metadata_sm_);
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data_sm_ = open_disk_sm(*tm_, static_cast<void *>(&sb_.data_space_map_root_));
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details_ = device_tree::ptr(new device_tree(*tm_, sb_.device_details_root_, device_tree_detail::device_details_traits::ref_counter()));
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mappings_top_level_ = dev_tree::ptr(new dev_tree(*tm_, sb_.data_mapping_root_,
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mapping_tree_detail::mtree_ref_counter(tm_)));
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mappings_ = mapping_tree::ptr(new mapping_tree(*tm_, sb_.data_mapping_root_,
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mapping_tree_detail::block_time_ref_counter(data_sm_)));
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break;
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case CREATE:
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tm_ = open_tm(bm);
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space_map::ptr core = tm_->get_sm();
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metadata_sm_ = create_metadata_sm(*tm_, tm_->get_bm()->get_nr_blocks());
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copy_space_maps(metadata_sm_, core);
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tm_->set_sm(metadata_sm_);
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data_sm_ = create_disk_sm(*tm_, nr_data_blocks);
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details_ = device_tree::ptr(new device_tree(*tm_, device_tree_detail::device_details_traits::ref_counter()));
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mappings_ = mapping_tree::ptr(new mapping_tree(*tm_,
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mapping_tree_detail::block_time_ref_counter(data_sm_)));
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mappings_top_level_ = dev_tree::ptr(new dev_tree(*tm_, mappings_->get_root(),
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mapping_tree_detail::mtree_ref_counter(tm_)));
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::memset(&sb_, 0, sizeof(sb_));
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sb_.magic_ = SUPERBLOCK_MAGIC;
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sb_.version_ = 1;
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sb_.data_mapping_root_ = mappings_->get_root();
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sb_.device_details_root_ = details_->get_root();
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sb_.data_block_size_ = data_block_size;
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sb_.metadata_block_size_ = MD_BLOCK_SIZE;
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sb_.metadata_nr_blocks_ = tm_->get_bm()->get_nr_blocks();
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break;
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}
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}
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void
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metadata::commit()
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{
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sb_.data_mapping_root_ = mappings_->get_root();
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sb_.device_details_root_ = details_->get_root();
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data_sm_->commit();
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data_sm_->copy_root(&sb_.data_space_map_root_, sizeof(sb_.data_space_map_root_));
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metadata_sm_->commit();
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metadata_sm_->copy_root(&sb_.metadata_space_map_root_, sizeof(sb_.metadata_space_map_root_));
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write_ref superblock = tm_->get_bm()->superblock_zero(SUPERBLOCK_LOCATION, superblock_validator());
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superblock_disk *disk = reinterpret_cast<superblock_disk *>(superblock.data());
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superblock_traits::pack(sb_, *disk);
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}
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//----------------------------------------------------------------
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