1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
2 // vim: ts=8 sw=2 smarttab
4 * Ceph - scalable distributed file system
6 * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
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.
15 #ifndef CEPH_SNAPSERVER_H
16 #define CEPH_SNAPSERVER_H
18 #include "MDSTableServer.h"
24 class SnapServer : public MDSTableServer {
26 MonClient *mon_client;
28 map<snapid_t, SnapInfo> snaps;
29 map<int, set<snapid_t> > need_to_purge;
31 map<version_t, SnapInfo> pending_update;
32 map<version_t, pair<snapid_t,snapid_t> > pending_destroy; // (removed_snap, seq)
33 set<version_t> pending_noop;
35 version_t last_checked_osdmap;
38 SnapServer(MDSRank *m, MonClient *monc)
39 : MDSTableServer(m, TABLE_SNAP), mon_client(monc), last_checked_osdmap(0)
42 void reset_state() override;
43 void encode_server_state(bufferlist& bl) const override {
44 ENCODE_START(3, 3, bl);
45 ::encode(last_snap, bl);
47 ::encode(need_to_purge, bl);
48 ::encode(pending_update, bl);
49 ::encode(pending_destroy, bl);
50 ::encode(pending_noop, bl);
53 void decode_server_state(bufferlist::iterator& bl) override {
54 DECODE_START_LEGACY_COMPAT_LEN(3, 3, 3, bl);
55 ::decode(last_snap, bl);
57 ::decode(need_to_purge, bl);
58 ::decode(pending_update, bl);
60 ::decode(pending_destroy, bl);
62 map<version_t, snapid_t> t;
64 for (map<version_t, snapid_t>::iterator p = t.begin(); p != t.end(); ++p)
65 pending_destroy[p->first].first = p->second;
67 ::decode(pending_noop, bl);
71 // To permit enc/decoding in isolation in dencoder
72 SnapServer() : MDSTableServer(NULL, TABLE_SNAP), last_checked_osdmap(0) {}
73 void encode(bufferlist& bl) const {
74 encode_server_state(bl);
76 void decode(bufferlist::iterator& bl) {
77 decode_server_state(bl);
79 void dump(Formatter *f) const;
80 static void generate_test_instances(list<SnapServer*>& ls);
83 void _prepare(bufferlist &bl, uint64_t reqid, mds_rank_t bymds) override;
84 bool _is_prepared(version_t tid) const;
85 bool _commit(version_t tid, MMDSTableRequest *req=NULL) override;
86 void _rollback(version_t tid) override;
87 void _server_update(bufferlist& bl) override;
88 void handle_query(MMDSTableRequest *m) override;
90 void check_osd_map(bool force);
92 WRITE_CLASS_ENCODER(SnapServer)