--- /dev/null
+// -*- mode:c++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * ceph - scalable distributed file system
+ *
+ * copyright (c) 2014 john spray <john.spray@inktank.com>
+ *
+ * this is free software; you can redistribute it and/or
+ * modify it under the terms of the gnu lesser general public
+ * license version 2.1, as published by the free software
+ * foundation. see file copying.
+ */
+
+#ifndef JOURNAL_SCANNER_H
+#define JOURNAL_SCANNER_H
+
+// For Journaler::Header, can't forward-declare nested classes
+#include <osdc/Journaler.h>
+
+namespace librados {
+ class IoCtx;
+}
+
+#include "JournalFilter.h"
+
+/**
+ * A simple sequential reader for metadata journals. Unlike
+ * the MDS Journaler class, this is written to detect, record,
+ * and read past corruptions and missing objects. It is also
+ * less efficient but more plainly written.
+ */
+class JournalScanner
+{
+ private:
+ librados::IoCtx &io;
+
+ // Input constraints
+ const int rank;
+ JournalFilter const filter;
+
+ void gap_advance();
+
+ public:
+ JournalScanner(
+ librados::IoCtx &io_,
+ int rank_,
+ JournalFilter const &filter_) :
+ io(io_),
+ rank(rank_),
+ filter(filter_),
+ pointer_present(false),
+ pointer_valid(false),
+ header_present(false),
+ header_valid(false),
+ header(NULL) {};
+
+ JournalScanner(
+ librados::IoCtx &io_,
+ int rank_) :
+ io(io_),
+ rank(rank_),
+ pointer_present(false),
+ pointer_valid(false),
+ header_present(false),
+ header_valid(false),
+ header(NULL) {};
+
+ ~JournalScanner();
+
+ int scan(bool const full=true);
+ int scan_pointer();
+ int scan_header();
+ int scan_events();
+ void report(std::ostream &out) const;
+
+ std::string obj_name(uint64_t offset) const;
+ std::string obj_name(inodeno_t ino, uint64_t offset) const;
+
+ // The results of the scan
+ inodeno_t ino; // Corresponds to JournalPointer.front
+ class EventRecord {
+ public:
+ EventRecord() : log_event(NULL), raw_size(0) {}
+ EventRecord(LogEvent *le, uint32_t rs) : log_event(le), raw_size(rs) {}
+ LogEvent *log_event;
+ uint32_t raw_size; //< Size from start offset including all encoding overhead
+ };
+
+ class EventError {
+ public:
+ int r;
+ std::string description;
+ EventError(int r_, const std::string &desc_)
+ : r(r_), description(desc_) {}
+ };
+
+ typedef std::map<uint64_t, EventRecord> EventMap;
+ typedef std::map<uint64_t, EventError> ErrorMap;
+ typedef std::pair<uint64_t, uint64_t> Range;
+ bool pointer_present;
+ bool pointer_valid;
+ bool header_present;
+ bool header_valid;
+ Journaler::Header *header;
+
+ bool is_healthy() const;
+ bool is_readable() const;
+ std::vector<std::string> objects_valid;
+ std::vector<uint64_t> objects_missing;
+ std::vector<Range> ranges_invalid;
+ std::vector<uint64_t> events_valid;
+ EventMap events;
+
+ // For events present in ::events (i.e. scanned successfully),
+ // any subsequent errors handling them (e.g. replaying)
+ ErrorMap errors;
+
+
+ private:
+ // Forbid copy construction because I have ptr members
+ JournalScanner(const JournalScanner &rhs);
+};
+
+#endif // JOURNAL_SCANNER_H
+