ceph/src/tools/cephfs/Resetter.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2010 Greg Farnum <gregf@hq.newdream.net>
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  */
  13
  14 #ifndef JOURNAL_RESETTER_H_
  15 #define JOURNAL_RESETTER_H_
  16
  17
  18 #include "MDSUtility.h"
  19
  20 class Journaler;
  21
  22 /**
  23  * This class lets you reset an mds journal for troubleshooting or whatever.
  24  *
  25  * To use, create a Resetter, call init(), and then call reset() with the name
  26  * of the file to dump to.
  27  */
  28 class Resetter : public MDSUtility {
  29 private:
  30   mds_role_t role;
  31   inodeno_t ino;
  32   bool is_mdlog;
  33
  34 protected:
  35   int _write_reset_event(Journaler *journaler);
  36
  37 public:
  38   Resetter() {}
  39   ~Resetter() {}
  40
  41   int init(mds_role_t role_, const std::string &type, bool hard);
  42   /**
  43    * For use when no journal header/pointer was present: write one
  44    * out from scratch.
  45    */
  46   int reset_hard();
  47   int reset();
  48 };
  49
  50 #endif /* JOURNAL_RESETTER_H_ */