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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_JOURNAL_H
#define CEPH_JOURNAL_H
#include <errno.h>
#include "include/buffer_fwd.h"
#include "include/Context.h"
#include "common/Finisher.h"
#include "common/TrackedOp.h"
#include "os/ObjectStore.h"
#include "common/zipkin_trace.h"
class PerfCounters;
class Journal {
protected:
uuid_d fsid;
Finisher *finisher;
public:
CephContext* cct;
PerfCounters *logger;
protected:
Cond *do_sync_cond;
bool wait_on_full;
public:
Journal(CephContext* cct, uuid_d f, Finisher *fin, Cond *c=0) :
fsid(f), finisher(fin), cct(cct), logger(NULL),
do_sync_cond(c),
wait_on_full(false) { }
virtual ~Journal() { }
virtual int check() = 0; ///< check if journal appears valid
virtual int create() = 0; ///< create a fresh journal
virtual int open(uint64_t fs_op_seq) = 0; ///< open an existing journal
virtual void close() = 0; ///< close an open journal
virtual void flush() = 0;
virtual void get_devices(set<string> *ls) {}
virtual void collect_metadata(map<string,string> *pm) {}
/**
* reserve_throttle_and_backoff
*
* Implementation may throttle or backoff based on ops
* reserved here but not yet released using committed_thru.
*/
virtual void reserve_throttle_and_backoff(uint64_t count) = 0;
virtual int dump(ostream& out) { return -EOPNOTSUPP; }
void set_wait_on_full(bool b) { wait_on_full = b; }
// writes
virtual bool is_writeable() = 0;
virtual int make_writeable() = 0;
virtual void submit_entry(uint64_t seq, bufferlist& e, uint32_t orig_len,
Context *oncommit,
TrackedOpRef osd_op = TrackedOpRef()) = 0;
virtual void commit_start(uint64_t seq) = 0;
virtual void committed_thru(uint64_t seq) = 0;
/// Read next journal entry - asserts on invalid journal
virtual bool read_entry(
bufferlist &bl, ///< [out] payload on successful read
uint64_t &seq ///< [in,out] sequence number on last successful read
) = 0; ///< @return true on successful read, false on journal end
virtual bool should_commit_now() = 0;
virtual int prepare_entry(vector<ObjectStore::Transaction>& tls, bufferlist* tbl) = 0;
virtual off64_t get_journal_size_estimate() { return 0; }
// reads/recovery
};
#endif
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