thin-provisioning-tools/thin-provisioning/metadata.cc

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