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-rw-r--r--src/crush/CrushTreeDumper.h291
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph distributed storage system
+ *
+ * Copyright (C) 2015 Mirantis Inc
+ *
+ * Author: Mykola Golub <mgolub@mirantis.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ */
+
+#ifndef CRUSH_TREE_DUMPER_H
+#define CRUSH_TREE_DUMPER_H
+
+#include "CrushWrapper.h"
+#include "include/stringify.h"
+
+/**
+ * CrushTreeDumper:
+ * A helper class and functions to dump a crush tree.
+ *
+ * Example:
+ *
+ * class SimpleDumper : public CrushTreeDumper::Dumper<ostream> {
+ * public:
+ * SimpleDumper(const CrushWrapper *crush) :
+ * CrushTreeDumper::Dumper<ostream>(crush) {}
+ * protected:
+ * virtual void dump_item(const CrushTreeDumper::Item &qi, ostream *out) {
+ * *out << qi.id;
+ * for (int k = 0; k < qi.depth; k++)
+ * *out << "-";
+ * if (qi.is_bucket())
+ * *out << crush->get_item_name(qi.id)
+ * else
+ * *out << "osd." << qi.id;
+ * *out << "\n";
+ * }
+ * };
+ *
+ * SimpleDumper(crush).dump(out);
+ *
+ */
+
+namespace CrushTreeDumper {
+
+ struct Item {
+ int id;
+ int parent;
+ int depth;
+ float weight;
+ list<int> children;
+
+ Item() : id(0), parent(0), depth(0), weight(0) {}
+ Item(int i, int p, int d, float w) : id(i), parent(p), depth(d), weight(w) {}
+
+ bool is_bucket() const { return id < 0; }
+ };
+
+ template <typename F>
+ class Dumper : public list<Item> {
+ public:
+ explicit Dumper(const CrushWrapper *crush_,
+ const name_map_t& weight_set_names_)
+ : crush(crush_), weight_set_names(weight_set_names_) {
+ crush->find_nonshadow_roots(&roots);
+ root = roots.begin();
+ }
+ explicit Dumper(const CrushWrapper *crush_,
+ const name_map_t& weight_set_names_,
+ bool show_shadow)
+ : crush(crush_), weight_set_names(weight_set_names_) {
+ if (show_shadow) {
+ crush->find_roots(&roots);
+ } else {
+ crush->find_nonshadow_roots(&roots);
+ }
+ root = roots.begin();
+ }
+
+ virtual ~Dumper() {}
+
+ virtual void reset() {
+ root = roots.begin();
+ touched.clear();
+ clear();
+ }
+
+ virtual bool should_dump_leaf(int i) const {
+ return true;
+ }
+ virtual bool should_dump_empty_bucket() const {
+ return true;
+ }
+
+ bool should_dump(int id) {
+ if (id >= 0)
+ return should_dump_leaf(id);
+ if (should_dump_empty_bucket())
+ return true;
+ int s = crush->get_bucket_size(id);
+ for (int k = s - 1; k >= 0; k--) {
+ int c = crush->get_bucket_item(id, k);
+ if (should_dump(c))
+ return true;
+ }
+ return false;
+ }
+
+ bool next(Item &qi) {
+ if (empty()) {
+ while (root != roots.end() && !should_dump(*root))
+ ++root;
+ if (root == roots.end())
+ return false;
+ push_back(Item(*root, 0, 0, crush->get_bucket_weightf(*root)));
+ ++root;
+ }
+
+ qi = front();
+ pop_front();
+ touched.insert(qi.id);
+
+ if (qi.is_bucket()) {
+ // queue bucket contents, sorted by (class, name)
+ int s = crush->get_bucket_size(qi.id);
+ map<string,pair<int,float>> sorted;
+ for (int k = s - 1; k >= 0; k--) {
+ int id = crush->get_bucket_item(qi.id, k);
+ if (should_dump(id)) {
+ string sort_by;
+ if (id >= 0) {
+ const char *c = crush->get_item_class(id);
+ sort_by = c ? c : "";
+ sort_by += "_";
+ char nn[80];
+ snprintf(nn, sizeof(nn), "osd.%08d", id);
+ sort_by += nn;
+ } else {
+ sort_by = "_";
+ sort_by += crush->get_item_name(id);
+ }
+ sorted[sort_by] = make_pair(
+ id, crush->get_bucket_item_weightf(qi.id, k));
+ }
+ }
+ for (auto p = sorted.rbegin(); p != sorted.rend(); ++p) {
+ qi.children.push_back(p->second.first);
+ push_front(Item(p->second.first, qi.id, qi.depth + 1,
+ p->second.second));
+ }
+ }
+ return true;
+ }
+
+ void dump(F *f) {
+ reset();
+ Item qi;
+ while (next(qi))
+ dump_item(qi, f);
+ }
+
+ bool is_touched(int id) const { return touched.count(id) > 0; }
+
+ void set_root(const string& bucket) {
+ roots.clear();
+ if (crush->name_exists(bucket)) {
+ int i = crush->get_item_id(bucket);
+ roots.insert(i);
+ }
+ }
+
+ protected:
+ virtual void dump_item(const Item &qi, F *f) = 0;
+
+ protected:
+ const CrushWrapper *crush;
+ const name_map_t &weight_set_names;
+
+ private:
+ set<int> touched;
+ set<int> roots;
+ set<int>::iterator root;
+ };
+
+ inline void dump_item_fields(const CrushWrapper *crush,
+ const name_map_t& weight_set_names,
+ const Item &qi, Formatter *f) {
+ f->dump_int("id", qi.id);
+ const char *c = crush->get_item_class(qi.id);
+ if (c)
+ f->dump_string("device_class", c);
+ if (qi.is_bucket()) {
+ int type = crush->get_bucket_type(qi.id);
+ f->dump_string("name", crush->get_item_name(qi.id));
+ f->dump_string("type", crush->get_type_name(type));
+ f->dump_int("type_id", type);
+ } else {
+ f->dump_stream("name") << "osd." << qi.id;
+ f->dump_string("type", crush->get_type_name(0));
+ f->dump_int("type_id", 0);
+ f->dump_float("crush_weight", qi.weight);
+ f->dump_unsigned("depth", qi.depth);
+ }
+ if (qi.parent < 0) {
+ f->open_object_section("pool_weights");
+ for (auto& p : crush->choose_args) {
+ const crush_choose_arg_map& cmap = p.second;
+ int bidx = -1 - qi.parent;
+ const crush_bucket *b = crush->get_bucket(qi.parent);
+ if (b &&
+ bidx < (int)cmap.size &&
+ cmap.args[bidx].weight_set &&
+ cmap.args[bidx].weight_set_positions >= 1) {
+ int bpos;
+ for (bpos = 0;
+ bpos < (int)cmap.args[bidx].weight_set[0].size &&
+ b->items[bpos] != qi.id;
+ ++bpos) ;
+ string name;
+ if (p.first == CrushWrapper::DEFAULT_CHOOSE_ARGS) {
+ name = "(compat)";
+ } else {
+ auto q = weight_set_names.find(p.first);
+ name = q != weight_set_names.end() ? q->second :
+ stringify(p.first);
+ }
+ f->open_array_section(name.c_str());
+ for (unsigned opos = 0;
+ opos < cmap.args[bidx].weight_set_positions;
+ ++opos) {
+ float w = (float)cmap.args[bidx].weight_set[opos].weights[bpos] /
+ (float)0x10000;
+ f->dump_float("weight", w);
+ }
+ f->close_section();
+ }
+ }
+ f->close_section();
+ }
+ }
+
+ inline void dump_bucket_children(const CrushWrapper *crush,
+ const Item &qi, Formatter *f) {
+ if (!qi.is_bucket())
+ return;
+
+ f->open_array_section("children");
+ for (list<int>::const_iterator i = qi.children.begin();
+ i != qi.children.end();
+ ++i) {
+ f->dump_int("child", *i);
+ }
+ f->close_section();
+ }
+
+ class FormattingDumper : public Dumper<Formatter> {
+ public:
+ explicit FormattingDumper(const CrushWrapper *crush,
+ const name_map_t& weight_set_names)
+ : Dumper<Formatter>(crush, weight_set_names) {}
+ explicit FormattingDumper(const CrushWrapper *crush,
+ const name_map_t& weight_set_names,
+ bool show_shadow)
+ : Dumper<Formatter>(crush, weight_set_names, show_shadow) {}
+
+ protected:
+ void dump_item(const Item &qi, Formatter *f) override {
+ f->open_object_section("item");
+ dump_item_fields(qi, f);
+ dump_bucket_children(qi, f);
+ f->close_section();
+ }
+
+ virtual void dump_item_fields(const Item &qi, Formatter *f) {
+ CrushTreeDumper::dump_item_fields(crush, weight_set_names, qi, f);
+ }
+
+ virtual void dump_bucket_children(const Item &qi, Formatter *f) {
+ CrushTreeDumper::dump_bucket_children(crush, qi, f);
+ }
+ };
+
+}
+
+#endif
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