ceph/src/mds/Anchor.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) 2018 Red Hat
   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_ANCHOR_H
  16 #define CEPH_ANCHOR_H
  17
  18 #include <string>
  19
  20 #include "include/types.h"
  21 #include "mdstypes.h"
  22 #include "include/buffer.h"
  23
  24 /*
  25  * Anchor represents primary linkage of an inode. When adding inode to an
  26  * anchor table, MDS ensures that the table also contains inode's ancestor
  27  * inodes. MDS can get inode's path by looking up anchor table recursively.
  28  */
  29 class Anchor {
  30 public:
  31   Anchor() {}
  32   Anchor(inodeno_t i, inodeno_t di, std::string_view str, __u8 tp) :
  33     ino(i), dirino(di), d_name(str), d_type(tp) {}
  34
  35   void encode(bufferlist &bl) const;
  36   void decode(bufferlist::const_iterator &bl);
  37   void dump(Formatter *f) const;
  38   static void generate_test_instances(std::list<Anchor*>& ls);
  39   bool operator==(const Anchor &r) const {
  40     return ino == r.ino && dirino == r.dirino &&
  41            d_name == r.d_name && d_type == r.d_type &&
  42            frags == r.frags;
  43   }
  44
  45   inodeno_t ino;        // anchored ino
  46   inodeno_t dirino;
  47   std::string d_name;
  48   __u8 d_type = 0;
  49   std::set<frag_t> frags;
  50
  51   int omap_idx = -1;    // stored in which omap object
  52 };
  53 WRITE_CLASS_ENCODER(Anchor)
  54
  55 class RecoveredAnchor : public Anchor {
  56 public:
  57   RecoveredAnchor() {}
  58
  59   mds_rank_t auth = MDS_RANK_NONE; // auth hint
  60 };
  61
  62 class OpenedAnchor : public Anchor {
  63 public:
  64   OpenedAnchor(inodeno_t i, inodeno_t di, std::string_view str, __u8 tp, int nr) :
  65       Anchor(i, di, str, tp),
  66       nref(nr)
  67   {}
  68
  69   mutable int nref = 0; // how many children
  70 };
  71
  72 std::ostream& operator<<(std::ostream& out, const Anchor &a);
  73 #endif