diff options
Diffstat (limited to 'src/mds/MDLog.h')
| -rw-r--r-- | src/mds/MDLog.h | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/src/mds/MDLog.h b/src/mds/MDLog.h new file mode 100644 index 00000000..ea74180b --- /dev/null +++ b/src/mds/MDLog.h @@ -0,0 +1,337 @@ +// -*- 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_MDLOG_H +#define CEPH_MDLOG_H + +enum { + l_mdl_first = 5000, + l_mdl_evadd, + l_mdl_evex, + l_mdl_evtrm, + l_mdl_ev, + l_mdl_evexg, + l_mdl_evexd, + l_mdl_segadd, + l_mdl_segex, + l_mdl_segtrm, + l_mdl_seg, + l_mdl_segexg, + l_mdl_segexd, + l_mdl_expos, + l_mdl_wrpos, + l_mdl_rdpos, + l_mdl_jlat, + l_mdl_replayed, + l_mdl_last, +}; + +#include "include/types.h" +#include "include/Context.h" + +#include "MDSContext.h" +#include "common/Thread.h" +#include "common/Cond.h" + +#include "LogSegment.h" + +#include <list> + +class Journaler; +class JournalPointer; +class LogEvent; +class MDSRank; +class LogSegment; +class ESubtreeMap; + +class PerfCounters; + +#include <map> +using std::map; + +#include "common/Finisher.h" + + +class MDLog { +public: + MDSRank *mds; +protected: + int num_events; // in events + + int unflushed; + + bool capped; + + // Log position which is persistent *and* for which + // submit_entry wait_for_safe callbacks have already + // been called. + uint64_t safe_pos; + + inodeno_t ino; + Journaler *journaler; + + PerfCounters *logger; + + + // -- replay -- + class ReplayThread : public Thread { + MDLog *log; + public: + explicit ReplayThread(MDLog *l) : log(l) {} + void* entry() override { + log->_replay_thread(); + return 0; + } + } replay_thread; + bool already_replayed; + + friend class ReplayThread; + friend class C_MDL_Replay; + + MDSContext::vec waitfor_replay; + + void _replay(); // old way + void _replay_thread(); // new way + + // Journal recovery/rewrite logic + class RecoveryThread : public Thread { + MDLog *log; + MDSContext *completion; + public: + void set_completion(MDSContext *c) {completion = c;} + explicit RecoveryThread(MDLog *l) : log(l), completion(NULL) {} + void* entry() override { + log->_recovery_thread(completion); + return 0; + } + } recovery_thread; + void _recovery_thread(MDSContext *completion); + void _reformat_journal(JournalPointer const &jp, Journaler *old_journal, MDSContext *completion); + + // -- segments -- + map<uint64_t,LogSegment*> segments; + set<LogSegment*> expiring_segments; + set<LogSegment*> expired_segments; + std::size_t pre_segments_size = 0; // the num of segments when the mds finished replay-journal, to calc the num of segments growing + uint64_t event_seq; + int expiring_events; + int expired_events; + + struct PendingEvent { + LogEvent *le; + MDSContext *fin; + bool flush; + PendingEvent(LogEvent *e, MDSContext *c, bool f=false) : le(e), fin(c), flush(f) {} + }; + + int64_t mdsmap_up_features; + map<uint64_t,list<PendingEvent> > pending_events; // log segment -> event list + Mutex submit_mutex; + Cond submit_cond; + + void set_safe_pos(uint64_t pos) + { + std::lock_guard l(submit_mutex); + ceph_assert(pos >= safe_pos); + safe_pos = pos; + } + friend class MDSLogContextBase; + + void _submit_thread(); + class SubmitThread : public Thread { + MDLog *log; + public: + explicit SubmitThread(MDLog *l) : log(l) {} + void* entry() override { + log->_submit_thread(); + return 0; + } + } submit_thread; + friend class SubmitThread; + +public: + const std::set<LogSegment*> &get_expiring_segments() const + { + return expiring_segments; + } +protected: + + // -- subtreemaps -- + friend class ESubtreeMap; + friend class MDCache; + + uint64_t get_last_segment_seq() const { + ceph_assert(!segments.empty()); + return segments.rbegin()->first; + } + LogSegment *get_oldest_segment() { + return segments.begin()->second; + } + void remove_oldest_segment() { + map<uint64_t, LogSegment*>::iterator p = segments.begin(); + delete p->second; + segments.erase(p); + } + +public: + void create_logger(); + + // replay state + map<inodeno_t, set<inodeno_t> > pending_exports; + + void set_write_iohint(unsigned iohint_flags); + +public: + explicit MDLog(MDSRank *m) : mds(m), + num_events(0), + unflushed(0), + capped(false), + safe_pos(0), + journaler(0), + logger(0), + replay_thread(this), + already_replayed(false), + recovery_thread(this), + event_seq(0), expiring_events(0), expired_events(0), + mdsmap_up_features(0), + submit_mutex("MDLog::submit_mutex"), + submit_thread(this), + cur_event(NULL) { } + ~MDLog(); + + +private: + // -- segments -- + void _start_new_segment(); + void _prepare_new_segment(); + void _journal_segment_subtree_map(MDSContext *onsync); +public: + void start_new_segment() { + std::lock_guard l(submit_mutex); + _start_new_segment(); + } + void prepare_new_segment() { + std::lock_guard l(submit_mutex); + _prepare_new_segment(); + } + void journal_segment_subtree_map(MDSContext *onsync=NULL) { + submit_mutex.Lock(); + _journal_segment_subtree_map(onsync); + submit_mutex.Unlock(); + if (onsync) + flush(); + } + + LogSegment *peek_current_segment() { + return segments.empty() ? NULL : segments.rbegin()->second; + } + + LogSegment *get_current_segment() { + ceph_assert(!segments.empty()); + return segments.rbegin()->second; + } + + LogSegment *get_segment(LogSegment::seq_t seq) { + if (segments.count(seq)) + return segments[seq]; + return NULL; + } + + bool have_any_segments() const { + return !segments.empty(); + } + + void flush_logger(); + + size_t get_num_events() const { return num_events; } + size_t get_num_segments() const { return segments.size(); } + + uint64_t get_read_pos() const; + uint64_t get_write_pos() const; + uint64_t get_safe_pos() const; + Journaler *get_journaler() { return journaler; } + bool empty() const { return segments.empty(); } + + bool is_capped() const { return capped; } + void cap(); + + void kick_submitter(); + void shutdown(); + + // -- events -- +private: + LogEvent *cur_event; +public: + void _start_entry(LogEvent *e); + void start_entry(LogEvent *e) { + std::lock_guard l(submit_mutex); + _start_entry(e); + } + void cancel_entry(LogEvent *e); + void _submit_entry(LogEvent *e, MDSLogContextBase *c); + void submit_entry(LogEvent *e, MDSLogContextBase *c = 0) { + std::lock_guard l(submit_mutex); + _submit_entry(e, c); + submit_cond.Signal(); + } + void start_submit_entry(LogEvent *e, MDSLogContextBase *c = 0) { + std::lock_guard l(submit_mutex); + _start_entry(e); + _submit_entry(e, c); + submit_cond.Signal(); + } + bool entry_is_open() const { return cur_event != NULL; } + + void wait_for_safe( MDSContext *c ); + void flush(); + bool is_flushed() const { + return unflushed == 0; + } + +private: + void try_expire(LogSegment *ls, int op_prio); + void _maybe_expired(LogSegment *ls, int op_prio); + void _expired(LogSegment *ls); + void _trim_expired_segments(); + + friend class C_MaybeExpiredSegment; + friend class C_MDL_Flushed; + friend class C_OFT_Committed; + +public: + void trim_expired_segments(); + void trim(int max=-1); + int trim_all(); + bool expiry_done() const + { + return expiring_segments.empty() && expired_segments.empty(); + }; + +private: + void write_head(MDSContext *onfinish); + +public: + void create(MDSContext *onfinish); // fresh, empty log! + void open(MDSContext *onopen); // append() or replay() to follow! + void reopen(MDSContext *onopen); + void append(); + void replay(MDSContext *onfinish); + + void standby_trim_segments(); + + void dump_replay_status(Formatter *f) const; +}; + +#endif |