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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_MDS_EPEERUPDATE_H
#define CEPH_MDS_EPEERUPDATE_H
#include <string_view>
#include "../LogEvent.h"
#include "EMetaBlob.h"
/*
* rollback records, for remote/peer updates, which may need to be manually
* rolled back during journal replay. (or while active if leader fails, but in
* that case these records aren't needed.)
*/
struct link_rollback {
metareqid_t reqid;
inodeno_t ino;
bool was_inc;
utime_t old_ctime;
utime_t old_dir_mtime;
utime_t old_dir_rctime;
bufferlist snapbl;
link_rollback() : ino(0), was_inc(false) {}
void encode(bufferlist& bl) const;
void decode(bufferlist::const_iterator& bl);
void dump(Formatter *f) const;
static void generate_test_instances(std::list<link_rollback*>& ls);
};
WRITE_CLASS_ENCODER(link_rollback)
/*
* this is only used on an empty dir with a dirfrag on a remote node.
* we are auth for nothing. all we need to do is relink the directory
* in the hierarchy properly during replay to avoid breaking the
* subtree map.
*/
struct rmdir_rollback {
metareqid_t reqid;
dirfrag_t src_dir;
string src_dname;
dirfrag_t dest_dir;
string dest_dname;
bufferlist snapbl;
void encode(bufferlist& bl) const;
void decode(bufferlist::const_iterator& bl);
void dump(Formatter *f) const;
static void generate_test_instances(std::list<rmdir_rollback*>& ls);
};
WRITE_CLASS_ENCODER(rmdir_rollback)
struct rename_rollback {
struct drec {
dirfrag_t dirfrag;
utime_t dirfrag_old_mtime;
utime_t dirfrag_old_rctime;
inodeno_t ino, remote_ino;
string dname;
char remote_d_type;
utime_t old_ctime;
drec() : remote_d_type((char)S_IFREG) {}
void encode(bufferlist& bl) const;
void decode(bufferlist::const_iterator& bl);
void dump(Formatter *f) const;
static void generate_test_instances(std::list<drec*>& ls);
};
WRITE_CLASS_MEMBER_ENCODER(drec)
metareqid_t reqid;
drec orig_src, orig_dest;
drec stray; // we know this is null, but we want dname, old mtime/rctime
utime_t ctime;
bufferlist srci_snapbl;
bufferlist desti_snapbl;
void encode(bufferlist& bl) const;
void decode(bufferlist::const_iterator& bl);
void dump(Formatter *f) const;
static void generate_test_instances(std::list<rename_rollback*>& ls);
};
WRITE_CLASS_ENCODER(rename_rollback::drec)
WRITE_CLASS_ENCODER(rename_rollback)
class EPeerUpdate : public LogEvent {
public:
const static int OP_PREPARE = 1;
const static int OP_COMMIT = 2;
const static int OP_ROLLBACK = 3;
const static int LINK = 1;
const static int RENAME = 2;
const static int RMDIR = 3;
/*
* we journal a rollback metablob that contains the unmodified metadata
* too, because we may be updating previously dirty metadata, which
* will allow old log segments to be trimmed. if we end of rolling back,
* those updates could be lost.. so we re-journal the unmodified metadata,
* and replay will apply _either_ commit or rollback.
*/
EMetaBlob commit;
bufferlist rollback;
string type;
metareqid_t reqid;
mds_rank_t leader;
__u8 op; // prepare, commit, abort
__u8 origop; // link | rename
EPeerUpdate() : LogEvent(EVENT_PEERUPDATE), leader(0), op(0), origop(0) { }
EPeerUpdate(MDLog *mdlog, std::string_view s, metareqid_t ri, int leadermds, int o, int oo) :
LogEvent(EVENT_PEERUPDATE),
type(s),
reqid(ri),
leader(leadermds),
op(o), origop(oo) { }
void print(ostream& out) const override {
if (type.length())
out << type << " ";
out << " " << (int)op;
if (origop == LINK) out << " link";
if (origop == RENAME) out << " rename";
out << " " << reqid;
out << " for mds." << leader;
out << commit;
}
EMetaBlob *get_metablob() override { return &commit; }
void encode(bufferlist& bl, uint64_t features) const override;
void decode(bufferlist::const_iterator& bl) override;
void dump(Formatter *f) const override;
static void generate_test_instances(std::list<EPeerUpdate*>& ls);
void replay(MDSRank *mds) override;
};
WRITE_CLASS_ENCODER_FEATURES(EPeerUpdate)
#endif
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