ceph/src/messages/MCacheExpire.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_MCACHEEXPIRE_H
  16 #define CEPH_MCACHEEXPIRE_H
  17
  18 #include <boost/utility/string_view.hpp>
  19
  20 #include "mds/mdstypes.h"
  21
  22 class MCacheExpire : public Message {
  23   __s32 from;
  24
  25 public:
  26   /*
  27     group things by realm (auth delgation root), since that's how auth is determined.
  28     that makes it less work to process when exports are in progress.
  29   */
  30   struct realm {
  31     map<vinodeno_t, uint32_t> inodes;
  32     map<dirfrag_t, uint32_t> dirs;
  33     map<dirfrag_t, map<pair<string,snapid_t>,uint32_t> > dentries;
  34
  35     void merge(realm& o) {
  36       inodes.insert(o.inodes.begin(), o.inodes.end());
  37       dirs.insert(o.dirs.begin(), o.dirs.end());
  38       for (map<dirfrag_t,map<pair<string,snapid_t>,uint32_t> >::iterator p = o.dentries.begin();
  39            p != o.dentries.end();
  40            ++p) {
  41         if (dentries.count(p->first) == 0)
  42           dentries[p->first] = p->second;
  43         else
  44           dentries[p->first].insert(p->second.begin(), p->second.end());
  45       }
  46     }
  47
  48     void encode(bufferlist &bl) const {
  49       ::encode(inodes, bl);
  50       ::encode(dirs, bl);
  51       ::encode(dentries, bl);
  52     }
  53     void decode(bufferlist::iterator &bl) {
  54       ::decode(inodes, bl);
  55       ::decode(dirs, bl);
  56       ::decode(dentries, bl);
  57     }
  58   };
  59   WRITE_CLASS_ENCODER(realm)
  60
  61   map<dirfrag_t, realm> realms;
  62
  63   int get_from() { return from; }
  64
  65   MCacheExpire() : Message(MSG_MDS_CACHEEXPIRE), from(-1) {}
  66   MCacheExpire(int f) :
  67     Message(MSG_MDS_CACHEEXPIRE),
  68     from(f) { }
  69 private:
  70   ~MCacheExpire() override {}
  71
  72 public:
  73   const char *get_type_name() const override { return "cache_expire";}
  74
  75   void add_inode(dirfrag_t r, vinodeno_t vino, unsigned nonce) {
  76     realms[r].inodes[vino] = nonce;
  77   }
  78   void add_dir(dirfrag_t r, dirfrag_t df, unsigned nonce) {
  79     realms[r].dirs[df] = nonce;
  80   }
  81   void add_dentry(dirfrag_t r, dirfrag_t df, boost::string_view dn, snapid_t last, unsigned nonce) {
  82     realms[r].dentries[df][pair<string,snapid_t>(std::string(dn),last)] = nonce;
  83   }
  84
  85   void add_realm(dirfrag_t df, realm& r) {
  86     if (realms.count(df) == 0)
  87       realms[df] = r;
  88     else
  89       realms[df].merge(r);
  90   }
  91
  92   void decode_payload() override {
  93     bufferlist::iterator p = payload.begin();
  94     ::decode(from, p);
  95     ::decode(realms, p);
  96   }
  97
  98   void encode_payload(uint64_t features) override {
  99     ::encode(from, payload);
 100     ::encode(realms, payload);
 101   }
 102 };
 103
 104 WRITE_CLASS_ENCODER(MCacheExpire::realm)
 105
 106 #endif