ceph/src/mds/MDSTableServer.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_MDSTABLESERVER_H
  16 #define CEPH_MDSTABLESERVER_H
  17
  18 #include "MDSTable.h"
  19
  20 class MMDSTableRequest;
  21
  22 class MDSTableServer : public MDSTable {
  23 public:
  24   int table;
  25   map<version_t,mds_table_pending_t> pending_for_mds;  // ** child should encode this! **
  26
  27
  28 private:
  29   void handle_prepare(MMDSTableRequest *m);
  30   void _prepare_logged(MMDSTableRequest *m, version_t tid);
  31   friend class C_Prepare;
  32
  33   void handle_commit(MMDSTableRequest *m);
  34   void _commit_logged(MMDSTableRequest *m);
  35   friend class C_Commit;
  36
  37
  38   void handle_rollback(MMDSTableRequest *m);
  39
  40  public:
  41   virtual void handle_query(MMDSTableRequest *m) = 0;
  42   virtual void _prepare(bufferlist &bl, uint64_t reqid, mds_rank_t bymds) = 0;
  43   virtual bool _commit(version_t tid, MMDSTableRequest *req=NULL) = 0;
  44   virtual void _rollback(version_t tid) = 0;
  45   virtual void _server_update(bufferlist& bl) { ceph_abort(); }
  46
  47   void _note_prepare(mds_rank_t mds, uint64_t reqid) {
  48     pending_for_mds[version].mds = mds;
  49     pending_for_mds[version].reqid = reqid;
  50     pending_for_mds[version].tid = version;
  51   }
  52   void _note_commit(uint64_t tid) {
  53     pending_for_mds.erase(tid);
  54   }
  55   void _note_rollback(uint64_t tid) {
  56     pending_for_mds.erase(tid);
  57   }
  58
  59
  60   MDSTableServer(MDSRank *m, int tab) : MDSTable(m, get_mdstable_name(tab), false), table(tab) {}
  61   ~MDSTableServer() override {}
  62
  63   void handle_request(MMDSTableRequest *m);
  64   void do_server_update(bufferlist& bl);
  65
  66   virtual void encode_server_state(bufferlist& bl) const = 0;
  67   virtual void decode_server_state(bufferlist::iterator& bl) = 0;
  68
  69   void encode_state(bufferlist& bl) const override {
  70     encode_server_state(bl);
  71     ::encode(pending_for_mds, bl);
  72   }
  73   void decode_state(bufferlist::iterator& bl) override {
  74     decode_server_state(bl);
  75     ::decode(pending_for_mds, bl);
  76   }
  77
  78   // recovery
  79   void finish_recovery(set<mds_rank_t>& active);
  80   void handle_mds_recovery(mds_rank_t who);
  81 };
  82
  83 #endif