ceph/src/messages/MOSDPGNotify.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_MOSDPGPEERNOTIFY_H
  16 #define CEPH_MOSDPGPEERNOTIFY_H
  17
  18 #include "msg/Message.h"
  19
  20 #include "osd/osd_types.h"
  21
  22 /*
  23  * PGNotify - notify primary of my PGs and versions.
  24  */
  25
  26 class MOSDPGNotify : public Message {
  27
  28   static const int HEAD_VERSION = 6;
  29   static const int COMPAT_VERSION = 2;
  30
  31   epoch_t epoch = 0;
  32   /// query_epoch is the epoch of the query being responded to, or
  33   /// the current epoch if this is not being sent in response to a
  34   /// query. This allows the recipient to disregard responses to old
  35   /// queries.
  36   vector<pair<pg_notify_t,PastIntervals> > pg_list;   // pgid -> version
  37
  38  public:
  39   version_t get_epoch() const { return epoch; }
  40   const vector<pair<pg_notify_t,PastIntervals> >& get_pg_list() const {
  41     return pg_list;
  42   }
  43
  44   MOSDPGNotify()
  45     : Message(MSG_OSD_PG_NOTIFY, HEAD_VERSION, COMPAT_VERSION) {
  46     set_priority(CEPH_MSG_PRIO_HIGH);
  47   }
  48   MOSDPGNotify(epoch_t e, vector<pair<pg_notify_t,PastIntervals> >& l)
  49     : Message(MSG_OSD_PG_NOTIFY, HEAD_VERSION, COMPAT_VERSION),
  50       epoch(e) {
  51     pg_list.swap(l);
  52     set_priority(CEPH_MSG_PRIO_HIGH);
  53   }
  54 private:
  55   ~MOSDPGNotify() override {}
  56
  57 public:
  58   const char *get_type_name() const override { return "PGnot"; }
  59
  60   void encode_payload(uint64_t features) override {
  61     if (HAVE_FEATURE(features, SERVER_LUMINOUS)) {
  62       header.version = HEAD_VERSION;
  63     } else {
  64       // for jewel+kraken compat only
  65       header.version = 5;
  66
  67       // Use query_epoch for first entry for backwards compatibility
  68       epoch_t query_epoch = epoch;
  69       if (pg_list.size())
  70         query_epoch = pg_list.begin()->first.query_epoch;
  71
  72       ::encode(epoch, payload);
  73
  74       // v2 was vector<pg_info_t>
  75       __u32 n = pg_list.size();
  76       ::encode(n, payload);
  77       for (auto p = pg_list.begin();
  78            p != pg_list.end();
  79            p++)
  80         ::encode(p->first.info, payload);
  81
  82       ::encode(query_epoch, payload);
  83
  84       // v3 needs the PastIntervals for each record
  85       for (auto p = pg_list.begin();
  86            p != pg_list.end();
  87            p++) {
  88         p->second.encode_classic(payload);
  89       }
  90
  91       // v4 needs epoch_sent, query_epoch
  92       for (vector<pair<pg_notify_t,PastIntervals> >::iterator p = pg_list.begin();
  93            p != pg_list.end();
  94            p++)
  95         ::encode(pair<epoch_t, epoch_t>(
  96                    p->first.epoch_sent, p->first.query_epoch),
  97                  payload);
  98
  99       // v5 needs from, to
 100       for (vector<pair<pg_notify_t, PastIntervals> >::iterator p = pg_list.begin();
 101            p != pg_list.end();
 102            ++p) {
 103         ::encode(p->first.from, payload);
 104         ::encode(p->first.to, payload);
 105       }
 106       return;
 107     }
 108
 109     ::encode(epoch, payload);
 110     ::encode(pg_list, payload);
 111   }
 112
 113   void decode_payload() override {
 114     bufferlist::iterator p = payload.begin();
 115     if (header.version < 6) {
 116       // for kraken+jewel compat only
 117       epoch_t query_epoch;
 118       ::decode(epoch, p);
 119
 120       // decode pg_info_t portion of the vector
 121       __u32 n;
 122       ::decode(n, p);
 123       pg_list.resize(n);
 124       for (unsigned i=0; i<n; i++) {
 125         ::decode(pg_list[i].first.info, p);
 126       }
 127
 128       ::decode(query_epoch, p);
 129
 130       if (header.version >= 3) {
 131         // get the PastIntervals portion
 132         for (unsigned i=0; i<n; i++) {
 133           pg_list[i].second.decode_classic(p);
 134         }
 135       }
 136
 137       // v3 needs epoch_sent, query_epoch
 138       for (auto i = pg_list.begin();
 139            i != pg_list.end();
 140            i++) {
 141         if (header.version >= 4) {
 142           pair<epoch_t, epoch_t> dec;
 143           ::decode(dec, p);
 144           i->first.epoch_sent = dec.first;
 145           i->first.query_epoch = dec.second;
 146         } else {
 147           i->first.epoch_sent = epoch;
 148           i->first.query_epoch = query_epoch;
 149         }
 150       }
 151
 152       // v5 needs from and to
 153       if (header.version >= 5) {
 154         for (auto i = pg_list.begin();
 155              i != pg_list.end();
 156              i++) {
 157           ::decode(i->first.from, p);
 158           ::decode(i->first.to, p);
 159         }
 160       }
 161       return;
 162     }
 163
 164     ::decode(epoch, p);
 165     ::decode(pg_list, p);
 166   }
 167   void print(ostream& out) const override {
 168     out << "pg_notify(";
 169     for (auto i = pg_list.begin();
 170          i != pg_list.end();
 171          ++i) {
 172       if (i != pg_list.begin())
 173         out << " ";
 174       out << i->first << "=" << i->second;
 175     }
 176     out << " epoch " << epoch
 177         << ")";
 178   }
 179 };
 180
 181 #endif