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+// -*- 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.
+ */
+
+#include "MDSUtility.h"
+#include "RoleSelector.h"
+#include <vector>
+
+#include "mds/mdstypes.h"
+#include "mds/LogEvent.h"
+#include "mds/events/EMetaBlob.h"
+
+#include "include/rados/librados.hpp"
+
+#include "JournalFilter.h"
+
+class JournalScanner;
+
+
+/**
+ * Command line tool for investigating and repairing filesystems
+ * with damaged metadata logs
+ */
+class JournalTool : public MDSUtility
+{
+ private:
+ MDSRoleSelector role_selector;
+ // Bit hacky, use this `rank` member to control behaviour of the
+ // various main_ functions.
+ mds_rank_t rank;
+ // when set, generate per rank dump file path
+ bool all_ranks = false;
+
+ std::string type;
+
+ // Entry points
+ int main_journal(std::vector<const char*> &argv);
+ int main_header(std::vector<const char*> &argv);
+ int main_event(std::vector<const char*> &argv);
+
+ // Shared functionality
+ int recover_journal();
+
+ // Journal operations
+ int journal_inspect();
+ int journal_export(std::string const &path, bool import, bool force);
+ int journal_reset(bool hard);
+
+ // Header operations
+ int header_set();
+
+ // I/O handles
+ librados::Rados rados;
+ librados::IoCtx input;
+ librados::IoCtx output;
+
+ bool other_pool;
+
+ // Metadata backing store manipulation
+ int read_lost_found(std::set<std::string> &lost);
+ int recover_dentries(
+ EMetaBlob const &metablob,
+ bool const dry_run,
+ std::set<inodeno_t> *consumed_inos);
+
+ // Splicing
+ int erase_region(JournalScanner const &jp, uint64_t const pos, uint64_t const length);
+
+ // Backing store helpers
+ void encode_fullbit_as_inode(
+ const EMetaBlob::fullbit &fb,
+ const bool bare,
+ bufferlist *out_bl);
+ int consume_inos(const std::set<inodeno_t> &inos);
+
+ //validate type
+ int validate_type(const std::string &type);
+
+ // generate output file path for dump/export
+ std::string gen_dump_file_path(const std::string &prefix);
+
+ // check if an operation (mode, command) is safe to be
+ // executed on all ranks.
+ bool can_execute_for_all_ranks(const std::string &mode,
+ const std::string &command);
+ public:
+ static void usage();
+ JournalTool() :
+ rank(0), other_pool(false) {}
+ int main(std::vector<const char*> &argv);
+};
+