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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_LOGSEGMENT_H
#define CEPH_LOGSEGMENT_H
#include "include/dlist.h"
#include "include/elist.h"
#include "include/interval_set.h"
#include "include/Context.h"
#include "mdstypes.h"
#include "CInode.h"
#include "CDentry.h"
#include "CDir.h"
#include <ext/hash_set>
using __gnu_cxx::hash_set;
class CDir;
class CInode;
class CDentry;
class MDS;
class MDSlaveUpdate;
// The backtrace info struct here is used to maintain the backtrace in
// a queue that we will eventually want to write out (on journal segment
// expiry).
class BacktraceInfo {
public:
int64_t location;
int64_t pool;
struct inode_backtrace_t bt;
elist<BacktraceInfo*>::item item_logseg;
BacktraceInfo(int64_t l, CInode *i, LogSegment *ls, int64_t p = -1);
~BacktraceInfo();
};
class LogSegment {
public:
uint64_t offset, end;
int num_events;
uint64_t trimmable_at;
// dirty items
elist<CDir*> dirty_dirfrags, new_dirfrags;
elist<CInode*> dirty_inodes;
elist<CDentry*> dirty_dentries;
elist<CInode*> open_files;
elist<CInode*> dirty_dirfrag_dir;
elist<CInode*> dirty_dirfrag_nest;
elist<CInode*> dirty_dirfrag_dirfragtree;
elist<BacktraceInfo*> update_backtraces;
elist<MDSlaveUpdate*> slave_updates;
set<CInode*> truncating_inodes;
map<int, hash_set<version_t> > pending_commit_tids; // mdstable
set<metareqid_t> uncommitted_masters;
// client request ids
map<int, tid_t> last_client_tids;
// table version
version_t inotablev;
version_t sessionmapv;
map<int,version_t> tablev;
// try to expire
void try_to_expire(MDS *mds, C_GatherBuilder &gather_bld);
// cons
LogSegment(loff_t off) :
offset(off), end(off), num_events(0), trimmable_at(0),
dirty_dirfrags(member_offset(CDir, item_dirty)),
new_dirfrags(member_offset(CDir, item_new)),
dirty_inodes(member_offset(CInode, item_dirty)),
dirty_dentries(member_offset(CDentry, item_dirty)),
open_files(member_offset(CInode, item_open_file)),
dirty_dirfrag_dir(member_offset(CInode, item_dirty_dirfrag_dir)),
dirty_dirfrag_nest(member_offset(CInode, item_dirty_dirfrag_nest)),
dirty_dirfrag_dirfragtree(member_offset(CInode, item_dirty_dirfrag_dirfragtree)),
update_backtraces(member_offset(BacktraceInfo, item_logseg)),
slave_updates(0), // passed to begin() manually
inotablev(0), sessionmapv(0)
{ }
// backtrace handling
void queue_backtrace_update(CInode *in, int64_t location, int64_t pool = -1);
void remove_pending_backtraces(inodeno_t ino, int64_t pool);
void store_backtrace_update(MDS *mds, BacktraceInfo *info, Context *fin);
void _stored_backtrace(BacktraceInfo *info, Context *fin);
unsigned encode_parent_mutation(ObjectOperation& m, BacktraceInfo *info);
};
#endif
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