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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 __MDS_ESLAVEUPDATE_H
#define __MDS_ESLAVEUPDATE_H
#include "../LogEvent.h"
#include "EMetaBlob.h"
/*
* rollback records, for remote/slave updates, which may need to be manually
* rolled back during journal replay. (or while active if master 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;
void encode(bufferlist &bl) const {
__u8 struct_v = 1;
::encode(struct_v, bl);
::encode(reqid, bl);
::encode(ino, bl);
::encode(was_inc, bl);
::encode(old_ctime, bl);
::encode(old_dir_mtime, bl);
::encode(old_dir_rctime, bl);
}
void decode(bufferlist::iterator &bl) {
__u8 struct_v;
::decode(struct_v, bl);
::decode(reqid, bl);
::decode(ino, bl);
::decode(was_inc, bl);
::decode(old_ctime, bl);
::decode(old_dir_mtime, bl);
::decode(old_dir_rctime, bl);
}
};
WRITE_CLASS_ENCODER(link_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;
void encode(bufferlist &bl) const {
__u8 struct_v = 1;
::encode(struct_v, bl);
::encode(dirfrag, bl);
::encode(dirfrag_old_mtime, bl);
::encode(dirfrag_old_rctime, bl);
::encode(ino, bl);
::encode(remote_ino, bl);
::encode(dname, bl);
::encode(remote_d_type, bl);
::encode(old_ctime, bl);
}
void decode(bufferlist::iterator &bl) {
__u8 struct_v;
::decode(struct_v, bl);
::decode(dirfrag, bl);
::decode(dirfrag_old_mtime, bl);
::decode(dirfrag_old_rctime, bl);
::decode(ino, bl);
::decode(remote_ino, bl);
::decode(dname, bl);
::decode(remote_d_type, bl);
::decode(old_ctime, bl);
}
};
WRITE_CLASS_ENCODER_MEMBER(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;
void encode(bufferlist &bl) const {
__u8 struct_v = 1;
::encode(struct_v, bl);
::encode(reqid, bl);
encode(orig_src, bl);
encode(orig_dest, bl);
encode(stray, bl);
::encode(ctime, bl);
}
void decode(bufferlist::iterator &bl) {
__u8 struct_v;
::decode(struct_v, bl);
::decode(reqid, bl);
decode(orig_src, bl);
decode(orig_dest, bl);
decode(stray, bl);
::decode(ctime, bl);
}
};
WRITE_CLASS_ENCODER(rename_rollback)
class ESlaveUpdate : 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;
/*
* 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;
__s32 master;
__u8 op; // prepare, commit, abort
__u8 origop; // link | rename
ESlaveUpdate() : LogEvent(EVENT_SLAVEUPDATE) { }
ESlaveUpdate(MDLog *mdlog, const char *s, metareqid_t ri, int mastermds, int o, int oo) :
LogEvent(EVENT_SLAVEUPDATE), commit(mdlog),
type(s),
reqid(ri),
master(mastermds),
op(o), origop(oo) { }
void print(ostream& out) {
if (type.length())
out << type << " ";
out << " " << (int)op;
if (origop == LINK) out << " link";
if (origop == RENAME) out << " rename";
out << " " << reqid;
out << " for mds" << master;
out << commit;
}
void encode(bufferlist &bl) const {
__u8 struct_v = 1;
::encode(struct_v, bl);
::encode(type, bl);
::encode(reqid, bl);
::encode(master, bl);
::encode(op, bl);
::encode(origop, bl);
::encode(commit, bl);
::encode(rollback, bl);
}
void decode(bufferlist::iterator &bl) {
__u8 struct_v;
::decode(struct_v, bl);
::decode(type, bl);
::decode(reqid, bl);
::decode(master, bl);
::decode(op, bl);
::decode(origop, bl);
::decode(commit, bl);
::decode(rollback, bl);
}
void replay(MDS *mds);
};
#endif
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