ceph/src/messages/MOSDMap.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_MOSDMAP_H
  17 #define CEPH_MOSDMAP_H
  18
  19 #include "msg/Message.h"
  20 #include "osd/OSDMap.h"
  21 #include "include/ceph_features.h"
  22
  23 class MOSDMap : public MessageInstance<MOSDMap> {
  24 public:
  25   friend factory;
  26 private:
  27   static constexpr int HEAD_VERSION = 4;
  28   static constexpr int COMPAT_VERSION = 3;
  29
  30  public:
  31   uuid_d fsid;
  32   uint64_t encode_features = 0;
  33   map<epoch_t, bufferlist> maps;
  34   map<epoch_t, bufferlist> incremental_maps;
  35   epoch_t oldest_map =0, newest_map = 0;
  36
  37   // if we are fetching maps from the mon and have to jump a gap
  38   // (client's next needed map is older than mon's oldest) we can
  39   // share removed snaps from the gap here.
  40   mempool::osdmap::map<int64_t,OSDMap::snap_interval_set_t> gap_removed_snaps;
  41
  42   epoch_t get_first() const {
  43     epoch_t e = 0;
  44     map<epoch_t, bufferlist>::const_iterator i = maps.begin();
  45     if (i != maps.end())  e = i->first;
  46     i = incremental_maps.begin();
  47     if (i != incremental_maps.end() &&
  48         (e == 0 || i->first < e)) e = i->first;
  49     return e;
  50   }
  51   epoch_t get_last() const {
  52     epoch_t e = 0;
  53     map<epoch_t, bufferlist>::const_reverse_iterator i = maps.rbegin();
  54     if (i != maps.rend())  e = i->first;
  55     i = incremental_maps.rbegin();
  56     if (i != incremental_maps.rend() &&
  57         (e == 0 || i->first > e)) e = i->first;
  58     return e;
  59   }
  60   epoch_t get_oldest() {
  61     return oldest_map;
  62   }
  63   epoch_t get_newest() {
  64     return newest_map;
  65   }
  66
  67
  68   MOSDMap() : MessageInstance(CEPH_MSG_OSD_MAP, HEAD_VERSION, COMPAT_VERSION) { }
  69   MOSDMap(const uuid_d &f, const uint64_t features)
  70     : MessageInstance(CEPH_MSG_OSD_MAP, HEAD_VERSION, COMPAT_VERSION),
  71       fsid(f), encode_features(features),
  72       oldest_map(0), newest_map(0) { }
  73 private:
  74   ~MOSDMap() override {}
  75 public:
  76   // marshalling
  77   void decode_payload() override {
  78     auto p = payload.cbegin();
  79     decode(fsid, p);
  80     decode(incremental_maps, p);
  81     decode(maps, p);
  82     if (header.version >= 2) {
  83       decode(oldest_map, p);
  84       decode(newest_map, p);
  85     } else {
  86       oldest_map = 0;
  87       newest_map = 0;
  88     }
  89     if (header.version >= 4) {
  90       decode(gap_removed_snaps, p);
  91     }
  92   }
  93   void encode_payload(uint64_t features) override {
  94     using ceph::encode;
  95     header.version = HEAD_VERSION;
  96     header.compat_version = COMPAT_VERSION;
  97     encode(fsid, payload);
  98     if (OSDMap::get_significant_features(encode_features) !=
  99          OSDMap::get_significant_features(features)) {
 100       if ((features & CEPH_FEATURE_PGID64) == 0 ||
 101           (features & CEPH_FEATURE_PGPOOL3) == 0) {
 102         header.version = 1;  // old old_client version
 103         header.compat_version = 1;
 104       } else if ((features & CEPH_FEATURE_OSDENC) == 0) {
 105         header.version = 2;  // old pg_pool_t
 106         header.compat_version = 2;
 107       }
 108
 109       // reencode maps using old format
 110       //
 111       // FIXME: this can probably be done more efficiently higher up
 112       // the stack, or maybe replaced with something that only
 113       // includes the pools the client cares about.
 114       for (map<epoch_t,bufferlist>::iterator p = incremental_maps.begin();
 115            p != incremental_maps.end();
 116            ++p) {
 117         OSDMap::Incremental inc;
 118         auto q = p->second.cbegin();
 119         inc.decode(q);
 120         // always encode with subset of osdmaps canonical features
 121         uint64_t f = inc.encode_features & features;
 122         p->second.clear();
 123         if (inc.fullmap.length()) {
 124           // embedded full map?
 125           OSDMap m;
 126           m.decode(inc.fullmap);
 127           inc.fullmap.clear();
 128           m.encode(inc.fullmap, f | CEPH_FEATURE_RESERVED);
 129         }
 130         if (inc.crush.length()) {
 131           // embedded crush map
 132           CrushWrapper c;
 133           auto p = inc.crush.cbegin();
 134           c.decode(p);
 135           inc.crush.clear();
 136           c.encode(inc.crush, f);
 137         }
 138         inc.encode(p->second, f | CEPH_FEATURE_RESERVED);
 139       }
 140       for (map<epoch_t,bufferlist>::iterator p = maps.begin();
 141            p != maps.end();
 142            ++p) {
 143         OSDMap m;
 144         m.decode(p->second);
 145         // always encode with subset of osdmaps canonical features
 146         uint64_t f = m.get_encoding_features() & features;
 147         p->second.clear();
 148         m.encode(p->second, f | CEPH_FEATURE_RESERVED);
 149       }
 150     }
 151     encode(incremental_maps, payload);
 152     encode(maps, payload);
 153     if (header.version >= 2) {
 154       encode(oldest_map, payload);
 155       encode(newest_map, payload);
 156     }
 157     if (header.version >= 4) {
 158       encode(gap_removed_snaps, payload);
 159     }
 160   }
 161
 162   std::string_view get_type_name() const override { return "osdmap"; }
 163   void print(ostream& out) const override {
 164     out << "osd_map(" << get_first() << ".." << get_last();
 165     if (oldest_map || newest_map)
 166       out << " src has " << oldest_map << ".." << newest_map;
 167     if (!gap_removed_snaps.empty())
 168       out << " +gap_removed_snaps";
 169     out << ")";
 170   }
 171 };
 172
 173 #endif