ceph/src/messages/MOSDPGLog.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
  16 #ifndef CEPH_MOSDPGLOG_H
  17 #define CEPH_MOSDPGLOG_H
  18
  19 #include "messages/MOSDPeeringOp.h"
  20
  21 class MOSDPGLog : public MessageInstance<MOSDPGLog, MOSDPeeringOp> {
  22 public:
  23   friend factory;
  24 private:
  25   static constexpr int HEAD_VERSION = 5;
  26   static constexpr int COMPAT_VERSION = 5;
  27
  28   epoch_t epoch = 0;
  29   /// query_epoch is the epoch of the query being responded to, or
  30   /// the current epoch if this is not being sent in response to a
  31   /// query. This allows the recipient to disregard responses to old
  32   /// queries.
  33   epoch_t query_epoch = 0;
  34
  35 public:
  36   shard_id_t to;
  37   shard_id_t from;
  38   pg_info_t info;
  39   pg_log_t log;
  40   pg_missing_t missing;
  41   PastIntervals past_intervals;
  42
  43   epoch_t get_epoch() const { return epoch; }
  44   spg_t get_pgid() const { return spg_t(info.pgid.pgid, to); }
  45   epoch_t get_query_epoch() const { return query_epoch; }
  46
  47   spg_t get_spg() const override {
  48     return spg_t(info.pgid.pgid, to);
  49   }
  50   epoch_t get_map_epoch() const override {
  51     return epoch;
  52   }
  53   epoch_t get_min_epoch() const override {
  54     return query_epoch;
  55   }
  56
  57   PGPeeringEvent *get_event() override {
  58     return new PGPeeringEvent(
  59       epoch, query_epoch,
  60       MLogRec(pg_shard_t(get_source().num(), from),
  61               this),
  62       true,
  63       new PGCreateInfo(
  64         get_spg(),
  65         query_epoch,
  66         info.history,
  67         past_intervals,
  68         false));
  69   }
  70
  71   MOSDPGLog() : MessageInstance(MSG_OSD_PG_LOG, HEAD_VERSION, COMPAT_VERSION) {
  72     set_priority(CEPH_MSG_PRIO_HIGH);
  73   }
  74   MOSDPGLog(shard_id_t to, shard_id_t from,
  75             version_t mv, pg_info_t& i, epoch_t query_epoch)
  76     : MessageInstance(MSG_OSD_PG_LOG, HEAD_VERSION, COMPAT_VERSION),
  77       epoch(mv), query_epoch(query_epoch),
  78       to(to), from(from),
  79       info(i)  {
  80     set_priority(CEPH_MSG_PRIO_HIGH);
  81   }
  82
  83 private:
  84   ~MOSDPGLog() override {}
  85
  86 public:
  87   std::string_view get_type_name() const override { return "PGlog"; }
  88   void inner_print(ostream& out) const override {
  89     // NOTE: log is not const, but operator<< doesn't touch fields
  90     // swapped out by OSD code.
  91     out << "log " << log
  92         << " pi " << past_intervals;
  93   }
  94
  95   void encode_payload(uint64_t features) override {
  96     using ceph::encode;
  97     encode(epoch, payload);
  98     encode(info, payload);
  99     encode(log, payload);
 100     encode(missing, payload);
 101     if (!HAVE_FEATURE(features, SERVER_NAUTILUS)) {
 102       // pre-nautilus OSDs do not set last_peering_reset properly
 103       encode(epoch, payload);
 104     } else {
 105       encode(query_epoch, payload);
 106     }
 107     encode(past_intervals, payload);
 108     encode(to, payload);
 109     encode(from, payload);
 110   }
 111   void decode_payload() override {
 112     auto p = payload.cbegin();
 113     decode(epoch, p);
 114     decode(info, p);
 115     log.decode(p, info.pgid.pool());
 116     missing.decode(p, info.pgid.pool());
 117     decode(query_epoch, p);
 118     decode(past_intervals, p);
 119     decode(to, p);
 120     decode(from, p);
 121   }
 122 };
 123
 124 #endif