ceph/src/mds/events/EFragment.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) 2004-2006 Sage Weil <sage@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
  15 #ifndef CEPH_MDS_EFRAGMENT_H
  16 #define CEPH_MDS_EFRAGMENT_H
  17
  18 #include "../LogEvent.h"
  19 #include "EMetaBlob.h"
  20
  21 struct dirfrag_rollback {
  22   CDir::fnode_const_ptr fnode;
  23   dirfrag_rollback() { }
  24   void encode(bufferlist& bl) const;
  25   void decode(bufferlist::const_iterator& bl);
  26 };
  27 WRITE_CLASS_ENCODER(dirfrag_rollback)
  28
  29 class EFragment : public LogEvent {
  30 public:
  31   EMetaBlob metablob;
  32   __u8 op{0};
  33   inodeno_t ino;
  34   frag_t basefrag;
  35   __s32 bits{0};         // positive for split (from basefrag), negative for merge (to basefrag)
  36   frag_vec_t orig_frags;
  37   bufferlist rollback;
  38
  39   EFragment() : LogEvent(EVENT_FRAGMENT) { }
  40   EFragment(MDLog *mdlog, int o, dirfrag_t df, int b) :
  41     LogEvent(EVENT_FRAGMENT),
  42     op(o), ino(df.ino), basefrag(df.frag), bits(b) { }
  43
  44   void print(std::ostream& out) const override {
  45     out << "EFragment " << op_name(op) << " " << ino << " " << basefrag << " by " << bits << " " << metablob;
  46   }
  47
  48   enum {
  49     OP_PREPARE = 1,
  50     OP_COMMIT = 2,
  51     OP_ROLLBACK = 3,
  52     OP_FINISH = 4 // finish deleting orphan dirfrags
  53   };
  54   static std::string_view op_name(int o) {
  55     switch (o) {
  56     case OP_PREPARE: return "prepare";
  57     case OP_COMMIT: return "commit";
  58     case OP_ROLLBACK: return "rollback";
  59     case OP_FINISH: return "finish";
  60     default: return "???";
  61     }
  62   }
  63
  64   void add_orig_frag(frag_t df, dirfrag_rollback *drb=NULL) {
  65     using ceph::encode;
  66     orig_frags.push_back(df);
  67     if (drb)
  68       encode(*drb, rollback);
  69   }
  70
  71   EMetaBlob *get_metablob() override { return &metablob; }
  72
  73   void encode(bufferlist &bl, uint64_t features) const override;
  74   void decode(bufferlist::const_iterator &bl) override;
  75   void dump(Formatter *f) const override;
  76   static void generate_test_instances(std::list<EFragment*>& ls);
  77   void replay(MDSRank *mds) override;
  78 };
  79 WRITE_CLASS_ENCODER_FEATURES(EFragment)
  80
  81 #endif