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[btree_damage_visitor] cleanup: use btree_node_checker

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This commit is contained in:
Ming-Hung Tsai
2016-04-02 17:15:00 +08:00
parent c6c5086068
commit 1dce79bd55
1 changed files with 40 additions and 161 deletions
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201
persistent-data/data-structures/btree_damage_visitor.h
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@@ -2,6 +2,7 @@
#define PERSISTENT_DATA_DATA_STRUCTURES_DAMAGE_VISITOR_H
#include "persistent-data/data-structures/btree.h"
#include "persistent-data/data-structures/btree_node_checker.h"
#include "persistent-data/run.h"
//----------------------------------------------------------------
@@ -222,44 +223,55 @@ namespace persistent_data {
bool check_internal(node_location const &loc,
btree_detail::node_ref<block_traits> const &n) {
if (!already_visited(n) &&
check_block_nr(n) &&
check_value_size(n) &&
check_max_entries(n) &&
check_nr_entries(n, loc.is_sub_root()) &&
check_ordered_keys(n) &&
check_parent_key(loc.is_sub_root() ? boost::optional<uint64_t>() : loc.key, n)) {
if (loc.is_sub_root())
new_root(loc.level());
if (already_visited(n))
return false;
else if (!checker_.check_block_nr(n) ||
!checker_.check_value_size(n) ||
!checker_.check_max_entries(n) ||
!checker_.check_nr_entries(n, loc.is_sub_root()) ||
!checker_.check_ordered_keys(n) ||
!checker_.check_parent_key(n, loc.is_sub_root() ? boost::optional<uint64_t>() : loc.key)) {
report_damage(checker_.get_last_error_string());
good_internal(n.key_at(0));
return true;
return false;
}
return false;
if (loc.is_sub_root())
new_root(loc.level());
good_internal(n.key_at(0));
return true;
}
template <typename ValueTraits2>
bool check_leaf(node_location const &loc,
btree_detail::node_ref<ValueTraits2> const &n) {
if (!already_visited(n) &&
check_block_nr(n) &&
check_value_size(n) &&
check_max_entries(n) &&
check_nr_entries(n, loc.is_sub_root()) &&
check_ordered_keys(n) &&
check_parent_key(loc.is_sub_root() ? boost::optional<uint64_t>() : loc.key, n)) {
if (loc.is_sub_root())
new_root(loc.level());
if (already_visited(n))
return false;
else if (!checker_.check_block_nr(n) ||
!checker_.check_value_size(n) ||
!checker_.check_max_entries(n) ||
!checker_.check_nr_entries(n, loc.is_sub_root()) ||
!checker_.check_ordered_keys(n) ||
!checker_.check_parent_key(n, loc.is_sub_root() ? boost::optional<uint64_t>() : loc.key)) {
report_damage(checker_.get_last_error_string());
bool r = check_leaf_key(loc.level(), n);
if (r && n.get_nr_entries() > 0)
good_leaf(n.key_at(0), n.key_at(n.get_nr_entries() - 1) + 1);
return r;
return false;
}
return false;
if (loc.is_sub_root())
new_root(loc.level());
bool r = checker_.check_leaf_key(n, last_leaf_key_[loc.level()]);
if (!r)
report_damage(checker_.get_last_error_string());
else if (n.get_nr_entries() > 0) {
last_leaf_key_[loc.level()] = n.key_at(n.get_nr_entries() - 1);
good_leaf(n.key_at(0), n.key_at(n.get_nr_entries() - 1) + 1);
}
return r;
}
template <typename node>
@@ -276,140 +288,6 @@ namespace persistent_data {
return false;
}
template <typename node>
bool check_block_nr(node const &n) {
if (n.get_location() != n.get_block_nr()) {
std::ostringstream out;
out << "block number mismatch: actually "
<< n.get_location()
<< ", claims " << n.get_block_nr();
report_damage(out.str());
return false;
}
return true;
}
template <typename node>
bool check_value_size(node const &n) {
if (!n.value_sizes_match()) {
report_damage(n.value_mismatch_string());
return false;
}
return true;
}
template <typename node>
bool check_max_entries(node const &n) {
size_t elt_size = sizeof(uint64_t) + n.get_value_size();
if (elt_size * n.get_max_entries() + sizeof(node_header) > MD_BLOCK_SIZE) {
std::ostringstream out;
out << "max entries too large: " << n.get_max_entries()
<< " (block " << n.get_location() << ")";
report_damage(out.str());
return false;
}
if (n.get_max_entries() % 3) {
std::ostringstream out;
out << "max entries is not divisible by 3: " << n.get_max_entries()
<< " (block " << n.get_location() << ")";
report_damage(out.str());
return false;
}
return true;
}
template <typename node>
bool check_nr_entries(node const &n, bool is_root) {
if (n.get_nr_entries() > n.get_max_entries()) {
std::ostringstream out;
out << "bad nr_entries: "
<< n.get_nr_entries() << " < "
<< n.get_max_entries()
<< " (block " << n.get_location() << ")";
report_damage(out.str());
return false;
}
block_address min = n.get_max_entries() / 3;
if (!is_root && (n.get_nr_entries() < min)) {
ostringstream out;
out << "too few entries in btree_node: "
<< n.get_nr_entries()
<< ", expected at least "
<< min
<< " (block " << n.get_location()
<< ", max_entries = " << n.get_max_entries() << ")";
report_damage(out.str());
return false;
}
return true;
}
template <typename node>
bool check_ordered_keys(node const &n) {
unsigned nr_entries = n.get_nr_entries();
if (nr_entries == 0)
return true; // can only happen if a root node
uint64_t last_key = n.key_at(0);
for (unsigned i = 1; i < nr_entries; i++) {
uint64_t k = n.key_at(i);
if (k <= last_key) {
ostringstream out;
out << "keys are out of order, " << k << " <= " << last_key
<< " (block " << n.get_location() << ")";
report_damage(out.str());
return false;
}
last_key = k;
}
return true;
}
template <typename node>
bool check_parent_key(boost::optional<uint64_t> key, node const &n) {
if (!key)
return true;
if (*key > n.key_at(0)) {
ostringstream out;
out << "parent key mismatch: parent was " << *key
<< ", but lowest in node was " << n.key_at(0)
<< " (block " << n.get_location() << ")";
report_damage(out.str());
return false;
}
return true;
}
template <typename node>
bool check_leaf_key(unsigned level, node const &n) {
if (n.get_nr_entries() == 0)
return true; // can only happen if a root node
if (last_leaf_key_[level] && *last_leaf_key_[level] >= n.key_at(0)) {
ostringstream out;
out << "the last key of the previous leaf was " << *last_leaf_key_[level]
<< " and the first key of this leaf is " << n.key_at(0)
<< " (block " << n.get_location() << ")";
report_damage(out.str());
return false;
}
last_leaf_key_[level] = n.key_at(n.get_nr_entries() - 1);
return true;
}
void new_root(unsigned level) {
// we're starting a new subtree, so should
// reset the last_leaf value.
@@ -487,6 +365,7 @@ namespace persistent_data {
std::set<block_address> seen_;
boost::optional<uint64_t> last_leaf_key_[Levels];
btree_node_checker checker_;
path_tracker path_tracker_;
damage_tracker dt_;
std::list<std::string> damage_reasons_;