thin-provisioning-tools/thin-provisioning/metadata_checker.cc

278 lines
7.9 KiB
C++
Raw Normal View History

2011-12-16 00:04:31 +05:30
// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
2011-12-06 19:23:05 +05:30
//
2011-12-06 19:13:56 +05:30
// 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/>.
#include "thin-provisioning/file_utils.h"
#include "thin-provisioning/metadata.h"
#include "thin-provisioning/metadata_checker.h"
#include "thin-provisioning/superblock_validator.h"
2011-10-28 16:37:21 +05:30
using namespace thin_provisioning;
//----------------------------------------------------------------
namespace {
// As well as the standard btree checks, we build up a set of what
// devices having mappings defined, which can later be cross
// referenced with the details tree. A separate block_counter is
// used to later verify the data space map.
2012-03-02 15:30:31 +05:30
class mapping_validator : public btree<2, block_traits>::visitor {
2011-10-28 16:37:21 +05:30
public:
typedef boost::shared_ptr<mapping_validator> ptr;
2012-03-02 15:30:31 +05:30
typedef btree_checker<2, block_traits> checker;
2011-10-28 16:37:21 +05:30
mapping_validator(block_counter &metadata_counter, block_counter &data_counter)
2012-03-02 15:30:31 +05:30
: checker_(metadata_counter),
data_counter_(data_counter)
{
}
bool visit_internal(unsigned level,
bool sub_root,
optional<uint64_t> key,
btree_detail::node_ref<uint64_traits> const &n) {
return checker_.visit_internal(level, sub_root, key, n);
2011-10-28 16:37:21 +05:30
}
bool visit_internal_leaf(unsigned level,
bool sub_root,
optional<uint64_t> key,
btree_detail::node_ref<uint64_traits> const &n) {
2012-03-02 15:30:31 +05:30
bool r = checker_.visit_internal_leaf(level, sub_root, key, n);
2011-10-28 16:37:21 +05:30
for (unsigned i = 0; i < n.get_nr_entries(); i++)
devices_.insert(n.key_at(i));
return r;
}
bool visit_leaf(unsigned level,
bool sub_root,
optional<uint64_t> key,
btree_detail::node_ref<block_traits> const &n) {
2012-03-02 15:30:31 +05:30
bool r = checker_.visit_leaf(level, sub_root, key, n);
2011-10-28 16:37:21 +05:30
if (r)
for (unsigned i = 0; i < n.get_nr_entries(); i++)
data_counter_.inc(n.value_at(i).block_);
return r;
}
set<uint64_t> const &get_devices() const {
return devices_;
}
private:
2012-03-02 15:30:31 +05:30
checker checker_;
2011-10-28 16:37:21 +05:30
block_counter &data_counter_;
set<uint64_t> devices_;
};
2012-03-02 15:30:31 +05:30
class details_validator : public btree<1, device_details_traits>::visitor {
2011-10-28 16:37:21 +05:30
public:
typedef boost::shared_ptr<details_validator> ptr;
2012-03-02 15:30:31 +05:30
typedef btree_checker<1, device_details_traits> checker;
2011-10-28 16:37:21 +05:30
details_validator(block_counter &counter)
2012-03-02 15:30:31 +05:30
: checker_(counter) {
}
bool visit_internal(unsigned level,
bool sub_root,
optional<uint64_t> key,
btree_detail::node_ref<uint64_traits> const &n) {
return checker_.visit_internal(level, sub_root, key, n);
}
bool visit_internal_leaf(unsigned level,
bool sub_root,
optional<uint64_t> key,
btree_detail::node_ref<uint64_traits> const &n) {
return checker_.visit_internal_leaf(level, sub_root, key, n);
2011-10-28 16:37:21 +05:30
}
bool visit_leaf(unsigned level,
bool sub_root,
optional<uint64_t> key,
btree_detail::node_ref<device_details_traits> const &n) {
2012-03-02 15:30:31 +05:30
if (!checker_.visit_leaf(level, sub_root, key, n))
return false;
2011-10-28 16:37:21 +05:30
2012-03-02 15:30:31 +05:30
for (unsigned i = 0; i < n.get_nr_entries(); i++)
devices_.insert(n.key_at(i));
return true;
2011-10-28 16:37:21 +05:30
}
set<uint64_t> const &get_devices() const {
return devices_;
}
private:
2012-03-02 15:30:31 +05:30
checker checker_;
2011-10-28 16:37:21 +05:30
set<uint64_t> devices_;
};
struct check_count : public space_map::iterator {
check_count(string const &desc, block_counter const &expected)
: bad_(false),
expected_(expected),
errors_(new error_set(desc)) {
}
virtual void operator() (block_address b, ref_t actual) {
ref_t expected = expected_.get_count(b);
if (actual != expected) {
ostringstream out;
out << b << ": was " << actual
<< ", expected " << expected;
errors_->add_child(out.str());
bad_ = true;
}
}
bool bad_;
block_counter const &expected_;
error_set::ptr errors_;
};
optional<error_set::ptr>
check_ref_counts(string const &desc, block_counter const &counts,
space_map::ptr sm) {
check_count checker(desc, counts);
sm->iterate(checker);
return checker.bad_ ? optional<error_set::ptr>(checker.errors_) : optional<error_set::ptr>();
}
class metadata_checker {
public:
metadata_checker(string const &dev_path)
: bm_(open_bm(dev_path)) {
}
2011-10-28 16:37:21 +05:30
boost::optional<error_set::ptr> check() {
#if 1
// FIXME: finish
error_set::ptr errors(new error_set("Errors in metadata"));
superblock sb = read_superblock();
return errors;
#else
error_set::ptr errors(new error_set("Errors in metadata"));
2011-10-28 16:37:21 +05:30
block_counter metadata_counter, data_counter;
2012-05-17 16:58:23 +05:30
if (md->sb_.metadata_snap_) {
block_manager<>::ptr bm = md->tm_->get_bm();
2012-05-17 16:58:23 +05:30
block_address root = md->sb_.metadata_snap_;
2012-05-17 16:58:23 +05:30
metadata_counter.inc(root);
2012-05-17 16:58:23 +05:30
superblock sb;
block_manager<>::read_ref r = bm->read_lock(root);
superblock_disk const *sbd = reinterpret_cast<superblock_disk const *>(&r.data());
superblock_traits::unpack(*sbd, sb);
metadata_counter.inc(sb.data_mapping_root_);
metadata_counter.inc(sb.device_details_root_);
}
2011-10-28 16:37:21 +05:30
mapping_validator::ptr mv(new mapping_validator(metadata_counter,
data_counter));
md->mappings_->visit(mv);
set<uint64_t> const &mapped_devs = mv->get_devices();
details_validator::ptr dv(new details_validator(metadata_counter));
md->details_->visit(dv);
set<uint64_t> const &details_devs = dv->get_devices();
for (set<uint64_t>::const_iterator it = mapped_devs.begin(); it != mapped_devs.end(); ++it)
if (details_devs.count(*it) == 0) {
ostringstream out;
out << "mapping exists for device " << *it
<< ", yet there is no entry in the details tree.";
throw runtime_error(out.str());
}
metadata_counter.inc(SUPERBLOCK_LOCATION);
md->metadata_sm_->check(metadata_counter);
md->data_sm_->check(metadata_counter);
errors->add_child(check_ref_counts("Errors in metadata block reference counts",
metadata_counter, md->metadata_sm_));
errors->add_child(check_ref_counts("Errors in data block reference counts",
data_counter, md->data_sm_));
return (errors->get_children().size() > 0) ?
optional<error_set::ptr>(errors) :
optional<error_set::ptr>();
#endif
}
private:
static block_manager<>::ptr
open_bm(string const &dev_path) {
block_address nr_blocks = thin_provisioning::get_nr_blocks(dev_path);
return block_manager<>::ptr(new block_manager<>(dev_path, nr_blocks, 1, block_io<>::READ_ONLY));
}
2011-10-28 16:37:21 +05:30
// FIXME: common code with metadata.cc
superblock read_superblock() {
superblock sb;
block_manager<>::read_ref r = bm_->read_lock(SUPERBLOCK_LOCATION, superblock_validator());
superblock_disk const *sbd = reinterpret_cast<superblock_disk const *>(&r.data());
superblock_traits::unpack(*sbd, sb);
return sb;
2011-10-28 16:37:21 +05:30
}
typedef block_manager<>::read_ref read_ref;
typedef block_manager<>::write_ref write_ref;
typedef boost::shared_ptr<metadata> ptr;
block_manager<>::ptr bm_;
#if 0
tm_ptr tm_;
superblock sb_;
checked_space_map::ptr metadata_sm_;
checked_space_map::ptr data_sm_;
detail_tree::ptr details_;
dev_tree::ptr mappings_top_level_;
mapping_tree::ptr mappings_;
#endif
};
}
2011-10-28 16:37:21 +05:30
//----------------------------------------------------------------
boost::optional<error_set::ptr>
thin_provisioning::metadata_check(std::string const &dev_path)
{
metadata_checker checker(dev_path);
return checker.check();
2011-10-28 16:37:21 +05:30
}
//----------------------------------------------------------------