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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_SNAPCLIENT_H
#define CEPH_SNAPCLIENT_H
#include <string_view>
#include "MDSTableClient.h"
#include "snap.h"
#include "MDSContext.h"
class MDSRank;
class LogSegment;
class SnapClient : public MDSTableClient {
public:
explicit SnapClient(MDSRank *m) :
MDSTableClient(m, TABLE_SNAP) {}
void resend_queries() override;
void handle_query_result(const cref_t<MMDSTableRequest> &m) override;
void handle_notify_prep(const cref_t<MMDSTableRequest> &m) override;
void notify_commit(version_t tid) override;
void prepare_create(inodeno_t dirino, std::string_view name, utime_t stamp,
version_t *pstid, bufferlist *pbl, MDSContext *onfinish) {
bufferlist bl;
__u32 op = TABLE_OP_CREATE;
encode(op, bl);
encode(dirino, bl);
encode(name, bl);
encode(stamp, bl);
_prepare(bl, pstid, pbl, onfinish);
}
void prepare_create_realm(inodeno_t ino, version_t *pstid, bufferlist *pbl, MDSContext *onfinish) {
bufferlist bl;
__u32 op = TABLE_OP_CREATE;
encode(op, bl);
encode(ino, bl);
_prepare(bl, pstid, pbl, onfinish);
}
void prepare_destroy(inodeno_t ino, snapid_t snapid, version_t *pstid, bufferlist *pbl, MDSContext *onfinish) {
bufferlist bl;
__u32 op = TABLE_OP_DESTROY;
encode(op, bl);
encode(ino, bl);
encode(snapid, bl);
_prepare(bl, pstid, pbl, onfinish);
}
void prepare_update(inodeno_t ino, snapid_t snapid, std::string_view name, utime_t stamp,
version_t *pstid, MDSContext *onfinish) {
bufferlist bl;
__u32 op = TABLE_OP_UPDATE;
encode(op, bl);
encode(ino, bl);
encode(snapid, bl);
encode(name, bl);
encode(stamp, bl);
_prepare(bl, pstid, NULL, onfinish);
}
version_t get_cached_version() const { return cached_version; }
void refresh(version_t want, MDSContext *onfinish);
void sync(MDSContext *onfinish);
bool is_synced() const { return synced; }
void wait_for_sync(MDSContext *c) {
ceph_assert(!synced);
waiting_for_version[std::max<version_t>(cached_version, 1)].push_back(c);
}
snapid_t get_last_created() const { return cached_last_created; }
snapid_t get_last_destroyed() const { return cached_last_destroyed; }
void get_snaps(set<snapid_t>& snaps) const;
set<snapid_t> filter(const set<snapid_t>& snaps) const;
const SnapInfo* get_snap_info(snapid_t snapid) const;
void get_snap_infos(map<snapid_t, const SnapInfo*>& infomap, const set<snapid_t>& snaps) const;
int dump_cache(Formatter *f) const;
private:
version_t cached_version = 0;
snapid_t cached_last_created = 0, cached_last_destroyed = 0;
map<snapid_t, SnapInfo> cached_snaps;
map<version_t, SnapInfo> cached_pending_update;
map<version_t, pair<snapid_t,snapid_t> > cached_pending_destroy;
set<version_t> committing_tids;
map<version_t, MDSContext::vec > waiting_for_version;
uint64_t sync_reqid = 0;
bool synced = false;
};
#endif
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