1 files changed, 73 insertions, 0 deletions
diff --git a/src/mds/Anchor.h b/src/mds/Anchor.h
new file mode 100644
index 000000000..f2e9469d3
--- /dev/null
+++ b/src/mds/Anchor.h
@@ -0,0 +1,73 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2018 Red Hat
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_ANCHOR_H
+#define CEPH_ANCHOR_H
+
+#include <string>
+
+#include "include/types.h"
+#include "mdstypes.h"
+#include "include/buffer.h"
+
+/*
+ * Anchor represents primary linkage of an inode. When adding inode to an
+ * anchor table, MDS ensures that the table also contains inode's ancestor
+ * inodes. MDS can get inode's path by looking up anchor table recursively.
+ */
+class Anchor {
+public:
+  Anchor() {}
+  Anchor(inodeno_t i, inodeno_t di, std::string_view str, __u8 tp) :
+    ino(i), dirino(di), d_name(str), d_type(tp) {}
+
+  void encode(bufferlist &bl) const;
+  void decode(bufferlist::const_iterator &bl);
+  void dump(Formatter *f) const;
+  static void generate_test_instances(std::list<Anchor*>& ls);
+  bool operator==(const Anchor &r) const {
+    return ino == r.ino && dirino == r.dirino &&
+	   d_name == r.d_name && d_type == r.d_type &&
+	   frags == r.frags;
+  }
+
+  inodeno_t ino;	// anchored ino
+  inodeno_t dirino;
+  std::string d_name;
+  __u8 d_type = 0;
+  std::set<frag_t> frags;
+
+  int omap_idx = -1;	// stored in which omap object
+};
+WRITE_CLASS_ENCODER(Anchor)
+
+class RecoveredAnchor : public Anchor {
+public:
+  RecoveredAnchor() {}
+
+  mds_rank_t auth = MDS_RANK_NONE; // auth hint
+};
+
+class OpenedAnchor : public Anchor {
+public:
+  OpenedAnchor(inodeno_t i, inodeno_t di, std::string_view str, __u8 tp, int nr) :
+      Anchor(i, di, str, tp),
+      nref(nr)
+  {}
+
+  mutable int nref = 0; // how many children
+};
+
+std::ostream& operator<<(std::ostream& out, const Anchor &a);
+#endif