ceph/src/include/object.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_OBJECT_H
  16 #define CEPH_OBJECT_H
  17
  18 #include <stdint.h>
  19 #include <stdio.h>
  20
  21 #include <iosfwd>
  22 #include <iomanip>
  23
  24 #include "include/rados.h"
  25 #include "include/unordered_map.h"
  26
  27 #include "hash.h"
  28 #include "encoding.h"
  29 #include "ceph_hash.h"
  30 #include "cmp.h"
  31
  32 using namespace std;
  33
  34 struct object_t {
  35   string name;
  36
  37   object_t() {}
  38   // cppcheck-suppress noExplicitConstructor
  39   object_t(const char *s) : name(s) {}
  40   // cppcheck-suppress noExplicitConstructor
  41   object_t(const string& s) : name(s) {}
  42
  43   void swap(object_t& o) {
  44     name.swap(o.name);
  45   }
  46   void clear() {
  47     name.clear();
  48   }
  49
  50   void encode(bufferlist &bl) const {
  51     using ceph::encode;
  52     encode(name, bl);
  53   }
  54   void decode(bufferlist::const_iterator &bl) {
  55     using ceph::decode;
  56     decode(name, bl);
  57   }
  58 };
  59 WRITE_CLASS_ENCODER(object_t)
  60
  61 inline bool operator==(const object_t& l, const object_t& r) {
  62   return l.name == r.name;
  63 }
  64 inline bool operator!=(const object_t& l, const object_t& r) {
  65   return l.name != r.name;
  66 }
  67 inline bool operator>(const object_t& l, const object_t& r) {
  68   return l.name > r.name;
  69 }
  70 inline bool operator<(const object_t& l, const object_t& r) {
  71   return l.name < r.name;
  72 }
  73 inline bool operator>=(const object_t& l, const object_t& r) {
  74   return l.name >= r.name;
  75 }
  76 inline bool operator<=(const object_t& l, const object_t& r) {
  77   return l.name <= r.name;
  78 }
  79 inline ostream& operator<<(ostream& out, const object_t& o) {
  80   return out << o.name;
  81 }
  82
  83 namespace std {
  84   template<> struct hash<object_t> {
  85     size_t operator()(const object_t& r) const {
  86       //static hash<string> H;
  87       //return H(r.name);
  88       return ceph_str_hash_linux(r.name.c_str(), r.name.length());
  89     }
  90   };
  91 } // namespace std
  92
  93
  94 struct file_object_t {
  95   uint64_t ino, bno;
  96   mutable char buf[34];
  97
  98   file_object_t(uint64_t i=0, uint64_t b=0) : ino(i), bno(b) {
  99     buf[0] = 0;
 100   }
 101
 102   const char *c_str() const {
 103     if (!buf[0])
 104       snprintf(buf, sizeof(buf), "%llx.%08llx", (long long unsigned)ino, (long long unsigned)bno);
 105     return buf;
 106   }
 107
 108   operator object_t() {
 109     return object_t(c_str());
 110   }
 111 };
 112
 113
 114 // ---------------------------
 115 // snaps
 116
 117 struct snapid_t {
 118   uint64_t val;
 119   // cppcheck-suppress noExplicitConstructor
 120   snapid_t(uint64_t v=0) : val(v) {}
 121   snapid_t operator+=(snapid_t o) { val += o.val; return *this; }
 122   snapid_t operator++() { ++val; return *this; }
 123   operator uint64_t() const { return val; }
 124 };
 125
 126 inline void encode(snapid_t i, bufferlist &bl) { encode(i.val, bl); }
 127 inline void decode(snapid_t &i, bufferlist::const_iterator &p) { decode(i.val, p); }
 128
 129 template<>
 130 struct denc_traits<snapid_t> {
 131   static constexpr bool supported = true;
 132   static constexpr bool featured = false;
 133   static constexpr bool bounded = true;
 134   static constexpr bool need_contiguous = true;
 135   static void bound_encode(const snapid_t& o, size_t& p) {
 136     denc(o.val, p);
 137   }
 138   static void encode(const snapid_t &o, buffer::list::contiguous_appender& p) {
 139     denc(o.val, p);
 140   }
 141   static void decode(snapid_t& o, buffer::ptr::const_iterator &p) {
 142     denc(o.val, p);
 143   }
 144 };
 145
 146 inline ostream& operator<<(ostream& out, const snapid_t& s) {
 147   if (s == CEPH_NOSNAP)
 148     return out << "head";
 149   else if (s == CEPH_SNAPDIR)
 150     return out << "snapdir";
 151   else
 152     return out << hex << s.val << dec;
 153 }
 154
 155
 156 struct sobject_t {
 157   object_t oid;
 158   snapid_t snap;
 159
 160   sobject_t() : snap(0) {}
 161   sobject_t(object_t o, snapid_t s) : oid(o), snap(s) {}
 162
 163   void swap(sobject_t& o) {
 164     oid.swap(o.oid);
 165     snapid_t t = snap;
 166     snap = o.snap;
 167     o.snap = t;
 168   }
 169
 170   void encode(bufferlist& bl) const {
 171     using ceph::encode;
 172     encode(oid, bl);
 173     encode(snap, bl);
 174   }
 175   void decode(bufferlist::const_iterator& bl) {
 176     using ceph::decode;
 177     decode(oid, bl);
 178     decode(snap, bl);
 179   }
 180 };
 181 WRITE_CLASS_ENCODER(sobject_t)
 182
 183 inline bool operator==(const sobject_t &l, const sobject_t &r) {
 184   return l.oid == r.oid && l.snap == r.snap;
 185 }
 186 inline bool operator!=(const sobject_t &l, const sobject_t &r) {
 187   return l.oid != r.oid || l.snap != r.snap;
 188 }
 189 inline bool operator>(const sobject_t &l, const sobject_t &r) {
 190   return l.oid > r.oid || (l.oid == r.oid && l.snap > r.snap);
 191 }
 192 inline bool operator<(const sobject_t &l, const sobject_t &r) {
 193   return l.oid < r.oid || (l.oid == r.oid && l.snap < r.snap);
 194 }
 195 inline bool operator>=(const sobject_t &l, const sobject_t &r) {
 196   return l.oid > r.oid || (l.oid == r.oid && l.snap >= r.snap);
 197 }
 198 inline bool operator<=(const sobject_t &l, const sobject_t &r) {
 199   return l.oid < r.oid || (l.oid == r.oid && l.snap <= r.snap);
 200 }
 201 inline ostream& operator<<(ostream& out, const sobject_t &o) {
 202   return out << o.oid << "/" << o.snap;
 203 }
 204 namespace std {
 205   template<> struct hash<sobject_t> {
 206     size_t operator()(const sobject_t &r) const {
 207       static hash<object_t> H;
 208       static rjhash<uint64_t> I;
 209       return H(r.oid) ^ I(r.snap);
 210     }
 211   };
 212 } // namespace std
 213
 214 #endif