1 files changed, 106 insertions, 0 deletions
diff --git a/src/mds/snap.h b/src/mds/snap.h
new file mode 100644
index 000000000..f8b5b701a
--- /dev/null
+++ b/src/mds/snap.h
@@ -0,0 +1,106 @@
+// -*- 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) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * 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_MDS_SNAP_H
+#define CEPH_MDS_SNAP_H
+
+#include <map>
+#include <string_view>
+
+#include "mdstypes.h"
+#include "common/snap_types.h"
+
+#include "Capability.h"
+
+/*
+ * generic snap descriptor.
+ */
+struct SnapInfo {
+  void encode(ceph::buffer::list &bl) const;
+  void decode(ceph::buffer::list::const_iterator &bl);
+  void dump(ceph::Formatter *f) const;
+  static void generate_test_instances(std::list<SnapInfo*>& ls);
+
+  std::string_view get_long_name() const;
+
+  snapid_t snapid;
+  inodeno_t ino;
+  utime_t stamp;
+  std::string name;
+
+  mutable std::string long_name; ///< cached _$ino_$name
+  std::map<std::string,std::string> metadata;
+};
+WRITE_CLASS_ENCODER(SnapInfo)
+
+inline bool operator==(const SnapInfo &l, const SnapInfo &r)
+{
+  return l.snapid == r.snapid && l.ino == r.ino &&
+	 l.stamp == r.stamp && l.name == r.name;
+}
+
+std::ostream& operator<<(std::ostream& out, const SnapInfo &sn);
+
+/*
+ * SnapRealm - a subtree that shares the same set of snapshots.
+ */
+struct SnapRealm;
+
+struct snaplink_t {
+  void encode(ceph::buffer::list &bl) const;
+  void decode(ceph::buffer::list::const_iterator &bl);
+  void dump(ceph::Formatter *f) const;
+  static void generate_test_instances(std::list<snaplink_t*>& ls);
+
+  inodeno_t ino;
+  snapid_t first;
+};
+WRITE_CLASS_ENCODER(snaplink_t)
+
+std::ostream& operator<<(std::ostream& out, const snaplink_t &l);
+
+// carry data about a specific version of a SnapRealm
+struct sr_t {
+  void mark_parent_global() { flags |= PARENT_GLOBAL; }
+  void clear_parent_global() { flags &= ~PARENT_GLOBAL; }
+  bool is_parent_global() const { return flags & PARENT_GLOBAL; }
+
+  void mark_subvolume() { flags |= SUBVOLUME; }
+  void clear_subvolume() { flags &= ~SUBVOLUME; }
+  bool is_subvolume() const { return flags & SUBVOLUME; }
+
+  void encode(ceph::buffer::list &bl) const;
+  void decode(ceph::buffer::list::const_iterator &bl);
+  void dump(ceph::Formatter *f) const;
+  static void generate_test_instances(std::list<sr_t*>& ls);
+
+  snapid_t seq = 0;                     // basically, a version/seq # for changes to _this_ realm.
+  snapid_t created = 0;                 // when this realm was created.
+  snapid_t last_created = 0;            // last snap created in _this_ realm.
+  snapid_t last_destroyed = 0;          // seq for last removal
+  snapid_t current_parent_since = 1;
+  std::map<snapid_t, SnapInfo> snaps;
+  std::map<snapid_t, snaplink_t> past_parents;  // key is "last" (or NOSNAP)
+  std::set<snapid_t> past_parent_snaps;
+
+  __u32 flags = 0;
+  enum {
+    PARENT_GLOBAL	= 1 << 0,
+    SUBVOLUME		= 1 << 1,
+  };
+};
+WRITE_CLASS_ENCODER(sr_t)
+
+class MDCache;
+#endif