ceph/src/client/ClientSnapRealm.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #ifndef CEPH_CLIENT_SNAPREALM_H
   5 #define CEPH_CLIENT_SNAPREALM_H
   6
   7 #include "include/types.h"
   8 #include "common/snap_types.h"
   9 #include "include/xlist.h"
  10
  11 struct Inode;
  12
  13 struct SnapRealm {
  14   inodeno_t ino;
  15   int nref;
  16   snapid_t created;
  17   snapid_t seq;
  18
  19   inodeno_t parent;
  20   snapid_t parent_since;
  21   std::vector<snapid_t> prior_parent_snaps;  // snaps prior to parent_since
  22   std::vector<snapid_t> my_snaps;
  23
  24   SnapRealm *pparent;
  25   std::set<SnapRealm*> pchildren;
  26
  27 private:
  28   SnapContext cached_snap_context;  // my_snaps + parent snaps + past_parent_snaps
  29   friend std::ostream& operator<<(std::ostream& out, const SnapRealm& r);
  30
  31 public:
  32   xlist<Inode*> inodes_with_caps;
  33
  34   explicit SnapRealm(inodeno_t i) :
  35     ino(i), nref(0), created(0), seq(0),
  36     pparent(NULL) { }
  37
  38   void build_snap_context();
  39   void invalidate_cache() {
  40     cached_snap_context.clear();
  41   }
  42
  43   const SnapContext& get_snap_context() {
  44     if (cached_snap_context.seq == 0)
  45       build_snap_context();
  46     return cached_snap_context;
  47   }
  48
  49   void dump(Formatter *f) const;
  50 };
  51
  52 inline std::ostream& operator<<(std::ostream& out, const SnapRealm& r) {
  53   return out << "snaprealm(" << r.ino << " nref=" << r.nref << " c=" << r.created << " seq=" << r.seq
  54              << " parent=" << r.parent
  55              << " my_snaps=" << r.my_snaps
  56              << " cached_snapc=" << r.cached_snap_context
  57              << ")";
  58 }
  59
  60 #endif