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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"
#include "messages/MRemoveSnaps.h"
class MDSRank;
class MonClient;
class SnapServer : public MDSTableServer {
public:
SnapServer(MDSRank *m, MonClient *monc)
: MDSTableServer(m, TABLE_SNAP), mon_client(monc) {}
SnapServer() : MDSTableServer(NULL, TABLE_SNAP) {}
void handle_remove_snaps(const cref_t<MRemoveSnaps> &m);
void reset_state() override;
bool upgrade_format() {
// upgraded from old filesystem
ceph_assert(is_active());
ceph_assert(last_snap > 0);
bool upgraded = false;
if (get_version() == 0) {
// version 0 confuses snapclient code
reset();
upgraded = true;
}
if (snaprealm_v2_since == CEPH_NOSNAP) {
// new snapshots will have new format snaprealms
snaprealm_v2_since = last_snap + 1;
upgraded = true;
}
return upgraded;
}
void check_osd_map(bool force);
bool can_allow_multimds_snaps() const {
return snaps.empty() || snaps.begin()->first >= snaprealm_v2_since;
}
void encode(bufferlist& bl) const {
encode_server_state(bl);
}
void decode(bufferlist::const_iterator& bl) {
decode_server_state(bl);
}
void dump(Formatter *f) const;
static void generate_test_instances(std::list<SnapServer*>& ls);
bool force_update(snapid_t last, snapid_t v2_since,
map<snapid_t, SnapInfo>& _snaps);
protected:
void encode_server_state(bufferlist& bl) const override {
ENCODE_START(5, 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(last_created, bl);
encode(last_destroyed, bl);
encode(snaprealm_v2_since, bl);
ENCODE_FINISH(bl);
}
void decode_server_state(bufferlist::const_iterator& bl) override {
DECODE_START_LEGACY_COMPAT_LEN(5, 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);
if (struct_v >= 4) {
decode(last_created, bl);
decode(last_destroyed, bl);
} else {
last_created = last_snap;
last_destroyed = last_snap;
}
if (struct_v >= 5)
decode(snaprealm_v2_since, bl);
else
snaprealm_v2_since = CEPH_NOSNAP;
DECODE_FINISH(bl);
}
// server bits
void _prepare(const bufferlist &bl, uint64_t reqid, mds_rank_t bymds, bufferlist &out) override;
void _get_reply_buffer(version_t tid, bufferlist *pbl) const override;
void _commit(version_t tid, cref_t<MMDSTableRequest> req) override;
void _rollback(version_t tid) override;
void _server_update(bufferlist& bl) override;
bool _notify_prep(version_t tid) override;
void handle_query(const cref_t<MMDSTableRequest> &m) override;
MonClient *mon_client = nullptr;
snapid_t last_snap = 0;
snapid_t last_created, last_destroyed;
snapid_t snaprealm_v2_since;
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 = 0;
};
WRITE_CLASS_ENCODER(SnapServer)
#endif
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