147 lines
3.5 KiB
C++
147 lines
3.5 KiB
C++
// Copyright (C) 2015 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/pool_stream.h"
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#include "persistent-data/data-structures/btree_damage_visitor.h"
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using namespace thin_provisioning;
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using namespace persistent_data;
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//----------------------------------------------------------------
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namespace {
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class damage_visitor {
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public:
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virtual void visit(btree_path const &path, btree_detail::damage const &d) {
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throw std::runtime_error("damage in mapping tree, please run thin_check");
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}
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};
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uint32_t const UNMAPPED = -1;
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}
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//----------------------------------------------------------------
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pool_stream::pool_stream(cache_stream &stream,
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transaction_manager::ptr tm, superblock_detail::superblock const &sb,
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block_address nr_blocks)
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: stream_(stream),
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block_to_thin_(stream.nr_chunks(), UNMAPPED),
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nr_mapped_(0)
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{
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init_rmap(tm, sb, nr_blocks);
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}
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block_address
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pool_stream::nr_chunks() const
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{
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return nr_mapped_;
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}
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void
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pool_stream::rewind()
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{
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stream_.rewind();
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}
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bool
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pool_stream::advance(block_address count)
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{
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while (count--)
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if (!advance_one())
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return false;
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return true;
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}
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block_address
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pool_stream::index() const
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{
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return stream_.index();
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}
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chunk const &
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pool_stream::get() const
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{
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return stream_.get();
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}
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// FIXME: too big to return by value
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vector<pool_stream::rmap_region>
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pool_stream::read_rmap(transaction_manager::ptr tm,
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superblock_detail::superblock const &sb,
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block_address nr_blocks)
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{
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damage_visitor dv;
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rmap_visitor rv;
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mapping_tree mtree(*tm, sb.data_mapping_root_,
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mapping_tree_detail::block_traits::ref_counter(tm->get_sm()));
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rv.add_data_region(rmap_visitor::region(0, nr_blocks));
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btree_visit_values(mtree, rv, dv);
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rv.complete();
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cerr << "rmap size: " << rv.get_rmap().size() << "\n";
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return rv.get_rmap();
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}
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void
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pool_stream::init_rmap(transaction_manager::ptr tm,
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superblock_detail::superblock const &sb,
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block_address nr_blocks)
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{
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cerr << "reading rmap...";
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vector<rmap_region> rmap = read_rmap(tm, sb, nr_blocks);
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cerr << "done\n";
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vector<rmap_region>::const_iterator it;
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set<uint32_t> thins;
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for (it = rmap.begin(); it != rmap.end(); ++it) {
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rmap_region const &r = *it;
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for (block_address b = r.data_begin; b != r.data_end; b++)
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if (block_to_thin_[b] == UNMAPPED) {
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nr_mapped_++;
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block_to_thin_[b] = r.thin_dev;
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}
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thins.insert(r.thin_dev);
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}
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cerr << nr_mapped_ << " mapped blocks\n";
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cerr << "there are " << thins.size() << " thin devices\n";
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}
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bool
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pool_stream::advance_one()
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{
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block_address new_index = index() + 1;
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while (block_to_thin_[new_index] == UNMAPPED &&
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new_index < nr_chunks())
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new_index++;
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if (new_index >= nr_chunks())
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return false;
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return stream_.advance(new_index - index());
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}
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//----------------------------------------------------------------
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