[thin_scan] refactoring and performance improvement (#111)
This commit is contained in:
Ming-Hung Tsai
Joe Thornber
parent
a512b8754b
commit
9837feaee5
@ -35,6 +35,13 @@ using namespace thin_provisioning;
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//----------------------------------------------------------------
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namespace {
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bool check_flags(uint32_t flags) {
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flags &= 0x3;
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if (flags == INTERNAL_NODE || flags == LEAF_NODE)
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return true;
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return false;
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}
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// extracted from btree_damage_visitor.h
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template <typename node>
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bool check_block_nr(node const &n) {
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@ -97,67 +104,64 @@ namespace {
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}
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namespace {
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// FIXME: deprecated conversion from string constant to ‘char*’
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char const* metadata_block_type_name[] = {
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"unknown",
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"zero",
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"superblock",
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"btree_internal",
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"btree_leaf",
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"btree_unknown",
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"index_block",
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"bitmap_block"
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};
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uint32_t const SUPERBLOCK_CSUM_SEED = 160774;
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uint32_t const BITMAP_CSUM_XOR = 240779;
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uint32_t const INDEX_CSUM_XOR = 160478;
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uint32_t const BTREE_CSUM_XOR = 121107;
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enum metadata_block_type {
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UNKNOWN = 0,
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ZERO,
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SUPERBLOCK,
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BTREE_INTERNAL,
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BTREE_LEAF,
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BTREE_UNKNOWN,
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INDEX_BLOCK,
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BITMAP_BLOCK
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BITMAP_BLOCK,
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BTREE_NODE
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};
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struct block_range {
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// For UNKNOWN and ZERO
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class block_range {
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public:
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block_range()
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: begin_(0), end_(0),
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type_(UNKNOWN), ref_count_(-1),
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value_size_(0), is_valid_(false)
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{
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: begin_(0),
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end_(0),
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type_(UNKNOWN),
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is_valid_(false),
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ref_count_(-1) {
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}
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block_range(block_range const &rhs)
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: begin_(rhs.begin_), end_(rhs.end_),
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blocknr_begin_(rhs.blocknr_begin_),
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type_(rhs.type_), ref_count_(rhs.ref_count_),
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value_size_(rhs.value_size_), is_valid_(rhs.is_valid_)
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{
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: begin_(rhs.begin_),
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end_(rhs.end_),
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type_(rhs.type_),
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is_valid_(rhs.is_valid_),
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ref_count_(rhs.ref_count_) {
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}
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uint64_t size() const {
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virtual ~block_range() {}
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virtual void reset(int type,
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typename block_manager<>::read_ref &rr,
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int64_t ref_count) {
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begin_ = rr.get_location();
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end_ = begin_ + 1;
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type_ = type;
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ref_count_ = ref_count;
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is_valid_ = false;
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}
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virtual std::unique_ptr<block_range> clone() const {
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return std::unique_ptr<block_range>(new block_range(*this));
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}
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inline uint64_t size() const {
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return (end_ > begin_) ? (end_ - begin_) : 0;
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}
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// returns true if r is left or right-adjacent
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bool is_adjacent_to(block_range const &r) const {
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block_range const &lhs = begin_ < r.begin_ ? *this : r;
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block_range const &rhs = begin_ < r.begin_ ? r : *this;
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if (size() && r.size() &&
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rhs.begin_ == lhs.end_ &&
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((!blocknr_begin_ && !r.blocknr_begin_) ||
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(blocknr_begin_ && r.blocknr_begin_ &&
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*rhs.blocknr_begin_ >= *lhs.blocknr_begin_ &&
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(*rhs.blocknr_begin_ - *lhs.blocknr_begin_ == rhs.begin_ - lhs.begin_))) &&
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type_ == r.type_ &&
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ref_count_ == r.ref_count_ &&
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value_size_ == r.value_size_ &&
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is_valid_ == r.is_valid_)
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return true;
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return false;
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if (begin_ < r.begin_)
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return is_adjacent_to_(r);
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return r.is_adjacent_to_(*this);
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}
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bool concat(block_range const &r) {
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@ -168,160 +172,391 @@ namespace {
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return true;
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}
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uint64_t begin_;
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uint64_t end_; // one-pass-the-end
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boost::optional<uint64_t> blocknr_begin_;
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metadata_block_type type_;
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int64_t ref_count_; // ref_count in metadata space map
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size_t value_size_; // btree node only
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bool is_valid_;
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};
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void output_block_range(block_range const &r, std::ostream &out) {
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if (!r.size())
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return;
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if (r.end_ - r.begin_ > 1) {
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out << "<range_block type=\"" << metadata_block_type_name[r.type_]
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<< "\" location_begin=\"" << r.begin_;
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if (r.blocknr_begin_)
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out << "\" blocknr_begin=\"" << *r.blocknr_begin_;
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out << "\" length=\"" << r.end_ - r.begin_
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<< "\" ref_count=\"" << r.ref_count_
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<< "\" is_valid=\"" << r.is_valid_;
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} else {
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out << "<single_block type=\"" << metadata_block_type_name[r.type_]
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<< "\" location=\"" << r.begin_;
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if (r.blocknr_begin_)
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out << "\" blocknr=\"" << *r.blocknr_begin_;
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out << "\" ref_count=\"" << r.ref_count_
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<< "\" is_valid=\"" << r.is_valid_;
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virtual char const *type_name() const {
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switch (type_) {
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case ZERO:
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return "zero";
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default:
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return "unknown";
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}
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}
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if (r.type_ == BTREE_INTERNAL || r.type_ == BTREE_LEAF || r.type_ == BTREE_UNKNOWN) {
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out << "\" value_size=\"" << r.value_size_ << "\"/>" << endl;
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} else
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out << "\"/>" << endl;
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virtual void print(std::ostream &out) const {
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uint64_t s = size();
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if (s > 1) {
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out << "<range_block type=\"" << type_name()
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<< "\" location_begin=\"" << begin_
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<< "\" length=\"" << s
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<< "\" ref_count=\"" << ref_count_
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<< "\" is_valid=\"" << is_valid_
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<< "\"/>";
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} else if (s == 1) {
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out << "<single_block type=\"" << type_name()
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<< "\" location=\"" << begin_
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<< "\" ref_count=\"" << ref_count_
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<< "\" is_valid=\"" << is_valid_
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<< "\"/>";
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}
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}
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friend ostream &operator<<(std::ostream &out, block_range const &r);
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protected:
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// return true is rhs is right-adjacent
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virtual bool is_adjacent_to_(block_range const &rhs) const {
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if (type_ != rhs.type_)
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return false;
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if (rhs.begin_ != end_)
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return false;
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if (ref_count_ != rhs.ref_count_ ||
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is_valid_ != rhs.is_valid_)
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return false;
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return true;
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}
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uint64_t begin_;
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uint64_t end_; // one-pass-the-end. end_ == begin_ indicates an empty range.
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int type_;
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bool is_valid_;
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int64_t ref_count_; // ref_count in metadata space map
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};
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// For SUPERBLOCK, INDEX_BLOCK and BITMAP_BLOCK
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class meta_block_range: public block_range {
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public:
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meta_block_range()
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: block_range(),
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blocknr_begin_(0) {
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}
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meta_block_range(meta_block_range const &rhs)
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: block_range(rhs),
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blocknr_begin_(rhs.blocknr_begin_) {
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}
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virtual void reset(int type,
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typename block_manager<>::read_ref &rr,
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int64_t ref_count) {
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using namespace persistent_data;
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using namespace sm_disk_detail;
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using namespace superblock_detail;
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begin_ = rr.get_location();
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end_ = begin_ + 1;
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type_ = type;
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ref_count_ = ref_count;
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switch (type) {
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case SUPERBLOCK:
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blocknr_begin_ = to_cpu<uint64_t>(reinterpret_cast<superblock_disk const *>(rr.data())->blocknr_);
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break;
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case BITMAP_BLOCK:
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blocknr_begin_ = to_cpu<uint64_t>(reinterpret_cast<bitmap_header const *>(rr.data())->blocknr);
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break;
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case INDEX_BLOCK:
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blocknr_begin_ = to_cpu<uint64_t>(reinterpret_cast<metadata_index const *>(rr.data())->blocknr_);
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break;
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default:
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blocknr_begin_ = 0;
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}
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is_valid_ = (blocknr_begin_ == begin_) ? true : false;
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}
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virtual std::unique_ptr<block_range> clone() const {
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return std::unique_ptr<block_range>(new meta_block_range(*this));
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}
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virtual char const *type_name() const {
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switch (type_) {
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case SUPERBLOCK:
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return "superblock";
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case INDEX_BLOCK:
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return "index_block";
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case BITMAP_BLOCK:
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return "bitmap_block";
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default:
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return "unknown";
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}
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}
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virtual void print(std::ostream &out) const {
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uint64_t s = size();
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if (s > 1) {
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out << "<range_block type=\"" << type_name()
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<< "\" location_begin=\"" << begin_
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<< "\" blocknr_begin=\"" << blocknr_begin_
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<< "\" length=\"" << s
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<< "\" ref_count=\"" << ref_count_
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<< "\" is_valid=\"" << is_valid_
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<< "\"/>";
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} else if (s == 1) {
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out << "<single_block type=\"" << type_name()
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<< "\" location=\"" << begin_
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<< "\" blocknr=\"" << blocknr_begin_
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<< "\" ref_count=\"" << ref_count_
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<< "\" is_valid=\"" << is_valid_
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<< "\"/>";
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}
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}
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protected:
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virtual bool is_adjacent_to_(block_range const &rhs) const {
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if (!block_range::is_adjacent_to_(rhs))
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return false;
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meta_block_range const &r = dynamic_cast<meta_block_range const &>(rhs);
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if (r.blocknr_begin_ < blocknr_begin_)
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return false;
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if (r.blocknr_begin_ - blocknr_begin_ != r.begin_ - begin_)
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return false;
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return true;
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}
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block_address blocknr_begin_; // block number in header
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};
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// For BTREE_NODE
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class btree_block_range: public meta_block_range {
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public:
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btree_block_range()
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: meta_block_range(),
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flags_(0),
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value_size_(0) {
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}
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btree_block_range(btree_block_range const &rhs)
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: meta_block_range(rhs),
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flags_(rhs.flags_),
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value_size_(rhs.value_size_) {
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}
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virtual void reset(int type,
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typename block_manager<>::read_ref &rr,
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int64_t ref_count) {
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node_ref<uint64_traits> n = btree_detail::to_node<uint64_traits>(rr);
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begin_ = rr.get_location();
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end_ = begin_ + 1;
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type_ = type;
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ref_count_ = ref_count;
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blocknr_begin_ = n.get_block_nr();
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flags_ = to_cpu<uint32_t>(n.raw()->header.flags);
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value_size_ = n.get_value_size();
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if (check_flags(flags_) &&
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check_block_nr(n) &&
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check_max_entries(n) &&
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check_nr_entries(n, true) &&
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check_ordered_keys(n))
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is_valid_ = true;
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else
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is_valid_ = false;
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}
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virtual std::unique_ptr<block_range> clone() const {
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return std::unique_ptr<block_range>(new btree_block_range(*this));
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}
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virtual char const *type_name() const {
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if ((flags_ & INTERNAL_NODE) && !(flags_ & LEAF_NODE))
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return "btree_internal";
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else if (flags_ & LEAF_NODE)
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return "btree_leaf";
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else
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return "btree_unknown";
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};
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virtual void print(std::ostream &out) const {
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uint64_t s = size();
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if (s > 1) {
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out << "<range_block type=\"" << type_name()
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<< "\" location_begin=\"" << begin_
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<< "\" blocknr_begin=\"" << blocknr_begin_
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<< "\" length=\"" << s
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<< "\" ref_count=\"" << ref_count_
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<< "\" is_valid=\"" << is_valid_
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<< "\" value_size=\"" << value_size_
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<< "\"/>";
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} else if (s == 1) {
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out << "<single_block type=\"" << type_name()
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<< "\" location=\"" << begin_
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<< "\" blocknr=\"" << blocknr_begin_
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<< "\" ref_count=\"" << ref_count_
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<< "\" is_valid=\"" << is_valid_
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<< "\" value_size=\"" << value_size_
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<< "\"/>";
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}
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}
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protected:
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virtual bool is_adjacent_to_(block_range const &rhs) const {
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if (!meta_block_range::is_adjacent_to_(rhs))
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return false;
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btree_block_range const &r = dynamic_cast<btree_block_range const &>(rhs);
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if ((flags_ & 0x3) != (r.flags_ & 0x3))
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return false;
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if (value_size_ != r.value_size_)
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return false;
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return true;
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}
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uint32_t flags_;
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size_t value_size_;
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};
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ostream &operator<<(std::ostream &out, block_range const &r) {
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r.print(out);
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return out;
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}
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//-------------------------------------------------------------------
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class range_factory {
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public:
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virtual ~range_factory() {}
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block_range const &convert_to_range(block_manager<>::read_ref rr, int64_t ref_count) {
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if (!memcmp(rr.data(), zeros_.data(), MD_BLOCK_SIZE)) {
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br_.reset(ZERO, rr, ref_count);
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return br_;
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}
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uint32_t const *cksum = reinterpret_cast<uint32_t const*>(rr.data());
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base::crc32c sum(*cksum);
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sum.append(cksum + 1, MD_BLOCK_SIZE - sizeof(uint32_t));
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switch (sum.get_sum()) {
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case SUPERBLOCK_CSUM_SEED:
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mbr_.reset(SUPERBLOCK, rr, ref_count);
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return mbr_;
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case INDEX_CSUM_XOR:
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mbr_.reset(INDEX_BLOCK, rr, ref_count);
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return mbr_;
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case BITMAP_CSUM_XOR:
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mbr_.reset(BITMAP_BLOCK, rr, ref_count);
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return mbr_;
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case BTREE_CSUM_XOR:
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bbr_.reset(BTREE_NODE, rr, ref_count);
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return bbr_;
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default:
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br_.reset(UNKNOWN, rr, ref_count);
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return br_;
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}
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}
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private:
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static const std::vector<char> zeros_;
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// for internal caching only
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block_range br_;
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meta_block_range mbr_;
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btree_block_range bbr_;
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};
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const std::vector<char> range_factory::zeros_(MD_BLOCK_SIZE, 0);
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class metadata_scanner {
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public:
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metadata_scanner(block_manager<>::ptr bm, uint64_t scan_begin, uint64_t scan_end)
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: bm_(bm),
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scan_begin_(scan_begin),
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scan_end_(scan_end),
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index_(scan_begin) {
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if (scan_end_ <= scan_begin_)
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throw std::runtime_error("badly formed region (end <= begin)");
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// try to open metadata space-map (it's okay to fail)
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try {
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superblock_detail::superblock sb = read_superblock(bm);
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tm_ = open_tm(bm, superblock_detail::SUPERBLOCK_LOCATION);
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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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} catch (std::exception &e) {
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cerr << e.what() << endl;
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}
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// prefetch the first block
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block_range const &r = read_block(index_++);
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run_range_ = r.clone();
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}
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virtual ~metadata_scanner() {}
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std::unique_ptr<block_range> get_range() {
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std::unique_ptr<block_range> ret;
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while (index_ < scan_end_) {
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block_range const &r = read_block(index_++);
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if (!run_range_->concat(r)) {
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ret = std::move(run_range_);
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run_range_ = r.clone();
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break;
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}
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}
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||||
if (!ret) { // for the last run (index_ == scan_end_)
|
||||
ret = std::move(run_range_);
|
||||
run_range_.reset();
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
private:
|
||||
block_range const &read_block(block_address b) {
|
||||
block_manager<>::read_ref rr = bm_->read_lock(b);
|
||||
int64_t ref_count;
|
||||
try {
|
||||
ref_count = metadata_sm_ ? static_cast<int64_t>(metadata_sm_->get_count(b)) : -1;
|
||||
} catch (std::exception &e) {
|
||||
ref_count = -1;
|
||||
}
|
||||
return factory_.convert_to_range(rr, ref_count);
|
||||
}
|
||||
|
||||
// note: space_map does not take the ownership of transaction_manager,
|
||||
// so the transaction_manager must live in the same scope of space_map.
|
||||
block_manager<>::ptr bm_;
|
||||
transaction_manager::ptr tm_;
|
||||
checked_space_map::ptr metadata_sm_;
|
||||
|
||||
uint64_t scan_begin_;
|
||||
uint64_t scan_end_;
|
||||
uint64_t index_;
|
||||
std::unique_ptr<block_range> run_range_;
|
||||
|
||||
range_factory factory_;
|
||||
};
|
||||
|
||||
//-------------------------------------------------------------------
|
||||
|
||||
struct flags {
|
||||
flags() {
|
||||
flags(): exclusive_(true) {
|
||||
}
|
||||
|
||||
boost::optional<block_address> scan_begin_;
|
||||
boost::optional<block_address> scan_end_;
|
||||
bool exclusive_;
|
||||
};
|
||||
|
||||
int scan_metadata_(string const &input,
|
||||
std::ostream &out,
|
||||
flags const &f) {
|
||||
using namespace persistent_data;
|
||||
using namespace thin_provisioning;
|
||||
using namespace sm_disk_detail;
|
||||
|
||||
block_manager<>::ptr bm;
|
||||
bm = open_bm(input, block_manager<>::READ_ONLY);
|
||||
|
||||
bm = open_bm(input, block_manager<>::READ_ONLY, f.exclusive_);
|
||||
block_address scan_begin = f.scan_begin_ ? *f.scan_begin_ : 0;
|
||||
block_address scan_end = f.scan_end_ ? *f.scan_end_ : bm->get_nr_blocks();
|
||||
|
||||
const std::vector<char> zeros(MD_BLOCK_SIZE, 0);
|
||||
|
||||
// try to open metadata space-map (it's okay to fail)
|
||||
// note: transaction_manager and space_map must be in the same scope
|
||||
transaction_manager::ptr tm;
|
||||
checked_space_map::ptr metadata_sm;
|
||||
try {
|
||||
superblock_detail::superblock sb = read_superblock(bm);
|
||||
tm = open_tm(bm, superblock_detail::SUPERBLOCK_LOCATION);
|
||||
metadata_sm = open_metadata_sm(*tm, &sb.metadata_space_map_root_);
|
||||
tm->set_sm(metadata_sm);
|
||||
} catch (std::exception &e) {
|
||||
cerr << e.what() << endl;
|
||||
metadata_scanner scanner(bm, scan_begin, scan_end);
|
||||
std::unique_ptr<block_range> r;
|
||||
while ((r = scanner.get_range())) {
|
||||
out << *r << std::endl;
|
||||
}
|
||||
|
||||
block_range curr_range;
|
||||
block_range run_range;
|
||||
|
||||
bcache::validator::ptr sv = superblock_validator();
|
||||
bcache::validator::ptr nv = create_btree_node_validator();
|
||||
bcache::validator::ptr iv = index_validator();
|
||||
bcache::validator::ptr bv = bitmap_validator();
|
||||
|
||||
for (block_address b = scan_begin; b < scan_end; ++b) {
|
||||
block_manager<>::read_ref rr = bm->read_lock(b);
|
||||
|
||||
curr_range.begin_ = b;
|
||||
curr_range.end_ = b + 1;
|
||||
curr_range.blocknr_begin_ = boost::none;
|
||||
curr_range.type_ = UNKNOWN;
|
||||
curr_range.is_valid_ = false;
|
||||
|
||||
if (!memcmp(rr.data(), zeros.data(), MD_BLOCK_SIZE))
|
||||
curr_range.type_ = ZERO;
|
||||
|
||||
if (curr_range.type_ == UNKNOWN && sv->check_raw(rr.data())) {
|
||||
curr_range.type_ = SUPERBLOCK;
|
||||
curr_range.is_valid_ = true;
|
||||
}
|
||||
|
||||
if (curr_range.type_ == UNKNOWN && nv->check_raw(rr.data())) {
|
||||
// note: check_raw() doesn't check node_header::blocknr_
|
||||
node_ref<uint64_traits> n = btree_detail::to_node<uint64_traits>(rr);
|
||||
uint32_t flags = to_cpu<uint32_t>(n.raw()->header.flags);
|
||||
if ((flags & INTERNAL_NODE) && !(flags & LEAF_NODE))
|
||||
curr_range.type_ = BTREE_INTERNAL;
|
||||
else if (flags & LEAF_NODE)
|
||||
curr_range.type_ = BTREE_LEAF;
|
||||
else
|
||||
curr_range.type_ = BTREE_UNKNOWN;
|
||||
|
||||
if (curr_range.type_ != BTREE_UNKNOWN &&
|
||||
check_block_nr(n) &&
|
||||
check_max_entries(n) &&
|
||||
check_nr_entries(n, true) &&
|
||||
check_ordered_keys(n))
|
||||
curr_range.is_valid_ = true;
|
||||
else
|
||||
curr_range.is_valid_ = false;
|
||||
|
||||
curr_range.blocknr_begin_ = n.get_block_nr();
|
||||
curr_range.value_size_ = n.get_value_size();
|
||||
}
|
||||
|
||||
if (curr_range.type_ == UNKNOWN && bv->check_raw(rr.data())) {
|
||||
curr_range.type_ = BITMAP_BLOCK;
|
||||
bitmap_header const *data = reinterpret_cast<bitmap_header const *>(rr.data());
|
||||
curr_range.blocknr_begin_ = to_cpu<uint64_t>(data->blocknr);
|
||||
curr_range.is_valid_ = (to_cpu<uint64_t>(data->blocknr) == b) ? true : false;
|
||||
}
|
||||
|
||||
if (curr_range.type_ == UNKNOWN && iv->check_raw(rr.data())) {
|
||||
curr_range.type_ = INDEX_BLOCK;
|
||||
metadata_index const *mi = reinterpret_cast<metadata_index const *>(rr.data());
|
||||
curr_range.blocknr_begin_ = to_cpu<uint64_t>(mi->blocknr_);
|
||||
curr_range.is_valid_ = (to_cpu<uint64_t>(mi->blocknr_) == b) ? true : false;
|
||||
}
|
||||
|
||||
try {
|
||||
curr_range.ref_count_ = metadata_sm ?
|
||||
static_cast<int64_t>(metadata_sm->get_count(b)) : -1;
|
||||
} catch (std::exception &e) {
|
||||
curr_range.ref_count_ = -1;
|
||||
}
|
||||
|
||||
// store the current block
|
||||
if (!run_range.concat(curr_range)) {
|
||||
output_block_range(run_range, out);
|
||||
run_range = curr_range;
|
||||
}
|
||||
}
|
||||
|
||||
// output the last run
|
||||
output_block_range(run_range, out);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -351,12 +586,12 @@ thin_scan_cmd::thin_scan_cmd()
|
||||
|
||||
void
|
||||
thin_scan_cmd::usage(std::ostream &out) const {
|
||||
out << "Usage: " << get_name() << " [options] {device|file}" << endl
|
||||
<< "Options:" << endl
|
||||
<< " {-h|--help}" << endl
|
||||
<< " {-o|--output} <xml file>" << endl
|
||||
<< " {--begin} <block#>" << endl
|
||||
<< " {--end} <block#>" << endl
|
||||
out << "Usage: " << get_name() << " [options] {device|file}\n"
|
||||
<< "Options:\n"
|
||||
<< " {-h|--help}\n"
|
||||
<< " {-o|--output} <xml file>\n"
|
||||
<< " {--begin} <block#>\n"
|
||||
<< " {--end} <block#>\n"
|
||||
<< " {-V|--version}" << endl;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user