initial code repo

[stor4nfv.git] / src / ceph / src / mds / SnapServer.h

diff --git a/src/ceph/src/mds/SnapServer.h b/src/ceph/src/mds/SnapServer.h
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+++ b/src/ceph/src/mds/SnapServer.h
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+// -*- 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_SNAPSERVER_H
+#define CEPH_SNAPSERVER_H
+
+#include "MDSTableServer.h"
+#include "snap.h"
+
+class MDSRank;
+class MonClient;
+
+class SnapServer : public MDSTableServer {
+protected:
+  MonClient *mon_client;
+  snapid_t last_snap;
+  map<snapid_t, SnapInfo> snaps;
+  map<int, set<snapid_t> > need_to_purge;
+  
+  map<version_t, SnapInfo> pending_update;
+  map<version_t, pair<snapid_t,snapid_t> > pending_destroy; // (removed_snap, seq)
+  set<version_t>           pending_noop;
+
+  version_t last_checked_osdmap;
+
+public:
+  SnapServer(MDSRank *m, MonClient *monc)
+    : MDSTableServer(m, TABLE_SNAP), mon_client(monc), last_checked_osdmap(0)
+  {}
+    
+  void reset_state() override;
+  void encode_server_state(bufferlist& bl) const override {
+    ENCODE_START(3, 3, bl);
+    ::encode(last_snap, bl);
+    ::encode(snaps, bl);
+    ::encode(need_to_purge, bl);
+    ::encode(pending_update, bl);
+    ::encode(pending_destroy, bl);
+    ::encode(pending_noop, bl);
+    ENCODE_FINISH(bl);
+  }
+  void decode_server_state(bufferlist::iterator& bl) override {
+    DECODE_START_LEGACY_COMPAT_LEN(3, 3, 3, bl);
+    ::decode(last_snap, bl);
+    ::decode(snaps, bl);
+    ::decode(need_to_purge, bl);
+    ::decode(pending_update, bl);
+    if (struct_v >= 2)
+      ::decode(pending_destroy, bl);
+    else {
+      map<version_t, snapid_t> t;
+      ::decode(t, bl);
+      for (map<version_t, snapid_t>::iterator p = t.begin(); p != t.end(); ++p)
+       pending_destroy[p->first].first = p->second; 
+    } 
+    ::decode(pending_noop, bl);
+    DECODE_FINISH(bl);
+  }
+
+  // To permit enc/decoding in isolation in dencoder
+  SnapServer() : MDSTableServer(NULL, TABLE_SNAP), last_checked_osdmap(0) {}
+  void encode(bufferlist& bl) const {
+    encode_server_state(bl);
+  }
+  void decode(bufferlist::iterator& bl) {
+    decode_server_state(bl);
+  }
+  void dump(Formatter *f) const;
+  static void generate_test_instances(list<SnapServer*>& ls);
+
+  // server bits
+  void _prepare(bufferlist &bl, uint64_t reqid, mds_rank_t bymds) override;
+  bool _is_prepared(version_t tid) const;
+  bool _commit(version_t tid, MMDSTableRequest *req=NULL) override;
+  void _rollback(version_t tid) override;
+  void _server_update(bufferlist& bl) override;
+  void handle_query(MMDSTableRequest *m) override;
+
+  void check_osd_map(bool force);
+};
+WRITE_CLASS_ENCODER(SnapServer)
+
+#endif