update sources to v12.1.1

[ceph.git] / ceph / src / osd / OSD.cc

// -*- 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>
 * Copyright (C) 2017 OVH
 *
 * 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.
 *
 */
#include "acconfig.h"

#include <fstream>
#include <iostream>
#include <errno.h>
#include <sys/stat.h>
#include <signal.h>
#include <ctype.h>
#include <boost/scoped_ptr.hpp>

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif

#ifdef HAVE_SYS_MOUNT_H
#include <sys/mount.h>
#endif

#include "osd/PG.h"

#include "include/types.h"
#include "include/compat.h"

#include "OSD.h"
#include "OSDMap.h"
#include "Watch.h"
#include "osdc/Objecter.h"

#include "common/errno.h"
#include "common/ceph_argparse.h"
#include "common/ceph_time.h"
#include "common/version.h"
#include "common/io_priority.h"

#include "os/ObjectStore.h"
#ifdef HAVE_LIBFUSE
#include "os/FuseStore.h"
#endif

#include "PrimaryLogPG.h"


#include "msg/Messenger.h"
#include "msg/Message.h"

#include "mon/MonClient.h"

#include "messages/MLog.h"

#include "messages/MGenericMessage.h"
#include "messages/MOSDPing.h"
#include "messages/MOSDFailure.h"
#include "messages/MOSDMarkMeDown.h"
#include "messages/MOSDFull.h"
#include "messages/MOSDOp.h"
#include "messages/MOSDOpReply.h"
#include "messages/MOSDBackoff.h"
#include "messages/MOSDBeacon.h"
#include "messages/MOSDRepOp.h"
#include "messages/MOSDRepOpReply.h"
#include "messages/MOSDBoot.h"
#include "messages/MOSDPGTemp.h"

#include "messages/MOSDMap.h"
#include "messages/MMonGetOSDMap.h"
#include "messages/MOSDPGNotify.h"
#include "messages/MOSDPGQuery.h"
#include "messages/MOSDPGLog.h"
#include "messages/MOSDPGRemove.h"
#include "messages/MOSDPGInfo.h"
#include "messages/MOSDPGCreate.h"
#include "messages/MOSDPGTrim.h"
#include "messages/MOSDPGScan.h"
#include "messages/MOSDPGBackfill.h"
#include "messages/MBackfillReserve.h"
#include "messages/MRecoveryReserve.h"
#include "messages/MOSDECSubOpWrite.h"
#include "messages/MOSDECSubOpWriteReply.h"
#include "messages/MOSDECSubOpRead.h"
#include "messages/MOSDECSubOpReadReply.h"
#include "messages/MOSDPGCreated.h"
#include "messages/MOSDPGUpdateLogMissing.h"
#include "messages/MOSDPGUpdateLogMissingReply.h"

#include "messages/MOSDAlive.h"

#include "messages/MOSDScrub.h"
#include "messages/MOSDScrubReserve.h"
#include "messages/MOSDRepScrub.h"

#include "messages/MMonCommand.h"
#include "messages/MCommand.h"
#include "messages/MCommandReply.h"

#include "messages/MPGStats.h"
#include "messages/MPGStatsAck.h"

#include "messages/MWatchNotify.h"
#include "messages/MOSDPGPush.h"
#include "messages/MOSDPGPushReply.h"
#include "messages/MOSDPGPull.h"

#include "common/perf_counters.h"
#include "common/Timer.h"
#include "common/LogClient.h"
#include "common/AsyncReserver.h"
#include "common/HeartbeatMap.h"
#include "common/admin_socket.h"
#include "common/ceph_context.h"

#include "global/signal_handler.h"
#include "global/pidfile.h"

#include "include/color.h"
#include "perfglue/cpu_profiler.h"
#include "perfglue/heap_profiler.h"

#include "osd/OpRequest.h"

#include "auth/AuthAuthorizeHandler.h"
#include "auth/RotatingKeyRing.h"
#include "common/errno.h"

#include "objclass/objclass.h"

#include "common/cmdparse.h"
#include "include/str_list.h"
#include "include/util.h"

#include "include/assert.h"
#include "common/config.h"
#include "common/EventTrace.h"

#ifdef WITH_LTTNG
#define TRACEPOINT_DEFINE
#define TRACEPOINT_PROBE_DYNAMIC_LINKAGE
#include "tracing/osd.h"
#undef TRACEPOINT_PROBE_DYNAMIC_LINKAGE
#undef TRACEPOINT_DEFINE
#else
#define tracepoint(...)
#endif

#define dout_context cct
#define dout_subsys ceph_subsys_osd
#undef dout_prefix
#define dout_prefix _prefix(_dout, whoami, get_osdmap_epoch())


const double OSD::OSD_TICK_INTERVAL = 1.0;

static ostream& _prefix(std::ostream* _dout, int whoami, epoch_t epoch) {
  return *_dout << "osd." << whoami << " " << epoch << " ";
}

//Initial features in new superblock.
//Features here are also automatically upgraded
CompatSet OSD::get_osd_initial_compat_set() {
  CompatSet::FeatureSet ceph_osd_feature_compat;
  CompatSet::FeatureSet ceph_osd_feature_ro_compat;
  CompatSet::FeatureSet ceph_osd_feature_incompat;
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_BASE);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_PGINFO);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_OLOC);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_LEC);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_CATEGORIES);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_HOBJECTPOOL);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_BIGINFO);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_LEVELDBINFO);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_LEVELDBLOG);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_SNAPMAPPER);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_HINTS);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_PGMETA);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_MISSING);
  ceph_osd_feature_incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_FASTINFO);
  return CompatSet(ceph_osd_feature_compat, ceph_osd_feature_ro_compat,
                   ceph_osd_feature_incompat);
}

//Features are added here that this OSD supports.
CompatSet OSD::get_osd_compat_set() {
  CompatSet compat =  get_osd_initial_compat_set();
  //Any features here can be set in code, but not in initial superblock
  compat.incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_SHARDS);
  return compat;
}

OSDService::OSDService(OSD *osd) :
  osd(osd),
  cct(osd->cct),
  meta_osr(new ObjectStore::Sequencer("meta")),
  whoami(osd->whoami), store(osd->store),
  log_client(osd->log_client), clog(osd->clog),
  pg_recovery_stats(osd->pg_recovery_stats),
  cluster_messenger(osd->cluster_messenger),
  client_messenger(osd->client_messenger),
  logger(osd->logger),
  recoverystate_perf(osd->recoverystate_perf),
  monc(osd->monc),
  peering_wq(osd->peering_wq),
  recovery_gen_wq("recovery_gen_wq", cct->_conf->osd_recovery_thread_timeout,
                  &osd->disk_tp),
  class_handler(osd->class_handler),
  pg_epoch_lock("OSDService::pg_epoch_lock"),
  publish_lock("OSDService::publish_lock"),
  pre_publish_lock("OSDService::pre_publish_lock"),
  max_oldest_map(0),
  peer_map_epoch_lock("OSDService::peer_map_epoch_lock"),
  sched_scrub_lock("OSDService::sched_scrub_lock"), scrubs_pending(0),
  scrubs_active(0),
  agent_lock("OSDService::agent_lock"),
  agent_valid_iterator(false),
  agent_ops(0),
  flush_mode_high_count(0),
  agent_active(true),
  agent_thread(this),
  agent_stop_flag(false),
  agent_timer_lock("OSDService::agent_timer_lock"),
  agent_timer(osd->client_messenger->cct, agent_timer_lock),
  last_recalibrate(ceph_clock_now()),
  promote_max_objects(0),
  promote_max_bytes(0),
  objecter(new Objecter(osd->client_messenger->cct, osd->objecter_messenger, osd->monc, NULL, 0, 0)),
  objecter_finisher(osd->client_messenger->cct),
  watch_lock("OSDService::watch_lock"),
  watch_timer(osd->client_messenger->cct, watch_lock),
  next_notif_id(0),
  recovery_request_lock("OSDService::recovery_request_lock"),
  recovery_request_timer(cct, recovery_request_lock, false),
  recovery_sleep_lock("OSDService::recovery_sleep_lock"),
  recovery_sleep_timer(cct, recovery_sleep_lock, false),
  reserver_finisher(cct),
  local_reserver(&reserver_finisher, cct->_conf->osd_max_backfills,
                 cct->_conf->osd_min_recovery_priority),
  remote_reserver(&reserver_finisher, cct->_conf->osd_max_backfills,
                  cct->_conf->osd_min_recovery_priority),
  pg_temp_lock("OSDService::pg_temp_lock"),
  snap_sleep_lock("OSDService::snap_sleep_lock"),
  snap_sleep_timer(
    osd->client_messenger->cct, snap_sleep_lock, false /* relax locking */),
  scrub_sleep_lock("OSDService::scrub_sleep_lock"),
  scrub_sleep_timer(
    osd->client_messenger->cct, scrub_sleep_lock, false /* relax locking */),
  snap_reserver(&reserver_finisher,
                cct->_conf->osd_max_trimming_pgs),
  recovery_lock("OSDService::recovery_lock"),
  recovery_ops_active(0),
  recovery_ops_reserved(0),
  recovery_paused(false),
  map_cache_lock("OSDService::map_cache_lock"),
  map_cache(cct, cct->_conf->osd_map_cache_size),
  map_bl_cache(cct->_conf->osd_map_cache_size),
  map_bl_inc_cache(cct->_conf->osd_map_cache_size),
  in_progress_split_lock("OSDService::in_progress_split_lock"),
  stat_lock("OSDService::stat_lock"),
  full_status_lock("OSDService::full_status_lock"),
  cur_state(NONE),
  cur_ratio(0),
  epoch_lock("OSDService::epoch_lock"),
  boot_epoch(0), up_epoch(0), bind_epoch(0),
  is_stopping_lock("OSDService::is_stopping_lock")
#ifdef PG_DEBUG_REFS
  , pgid_lock("OSDService::pgid_lock")
#endif
{
  objecter->init();
}

OSDService::~OSDService()
{
  delete objecter;
}



#ifdef PG_DEBUG_REFS
void OSDService::add_pgid(spg_t pgid, PG *pg){
  Mutex::Locker l(pgid_lock);
  if (!pgid_tracker.count(pgid)) {
    live_pgs[pgid] = pg;
  }
  pgid_tracker[pgid]++;
}
void OSDService::remove_pgid(spg_t pgid, PG *pg)
{
  Mutex::Locker l(pgid_lock);
  assert(pgid_tracker.count(pgid));
  assert(pgid_tracker[pgid] > 0);
  pgid_tracker[pgid]--;
  if (pgid_tracker[pgid] == 0) {
    pgid_tracker.erase(pgid);
    live_pgs.erase(pgid);
  }
}
void OSDService::dump_live_pgids()
{
  Mutex::Locker l(pgid_lock);
  derr << "live pgids:" << dendl;
  for (map<spg_t, int>::const_iterator i = pgid_tracker.cbegin();
       i != pgid_tracker.cend();
       ++i) {
    derr << "\t" << *i << dendl;
    live_pgs[i->first]->dump_live_ids();
  }
}
#endif


void OSDService::_start_split(spg_t parent, const set<spg_t> &children)
{
  for (set<spg_t>::const_iterator i = children.begin();
       i != children.end();
       ++i) {
    dout(10) << __func__ << ": Starting split on pg " << *i
             << ", parent=" << parent << dendl;
    assert(!pending_splits.count(*i));
    assert(!in_progress_splits.count(*i));
    pending_splits.insert(make_pair(*i, parent));

    assert(!rev_pending_splits[parent].count(*i));
    rev_pending_splits[parent].insert(*i);
  }
}

void OSDService::mark_split_in_progress(spg_t parent, const set<spg_t> &children)
{
  Mutex::Locker l(in_progress_split_lock);
  map<spg_t, set<spg_t> >::iterator piter = rev_pending_splits.find(parent);
  assert(piter != rev_pending_splits.end());
  for (set<spg_t>::const_iterator i = children.begin();
       i != children.end();
       ++i) {
    assert(piter->second.count(*i));
    assert(pending_splits.count(*i));
    assert(!in_progress_splits.count(*i));
    assert(pending_splits[*i] == parent);

    pending_splits.erase(*i);
    piter->second.erase(*i);
    in_progress_splits.insert(*i);
  }
  if (piter->second.empty())
    rev_pending_splits.erase(piter);
}

void OSDService::cancel_pending_splits_for_parent(spg_t parent)
{
  Mutex::Locker l(in_progress_split_lock);
  _cancel_pending_splits_for_parent(parent);
}

void OSDService::_cancel_pending_splits_for_parent(spg_t parent)
{
  map<spg_t, set<spg_t> >::iterator piter = rev_pending_splits.find(parent);
  if (piter == rev_pending_splits.end())
    return;

  for (set<spg_t>::iterator i = piter->second.begin();
       i != piter->second.end();
       ++i) {
    assert(pending_splits.count(*i));
    assert(!in_progress_splits.count(*i));
    pending_splits.erase(*i);
    dout(10) << __func__ << ": Completing split on pg " << *i
             << " for parent: " << parent << dendl;
    _cancel_pending_splits_for_parent(*i);
  }
  rev_pending_splits.erase(piter);
}

void OSDService::_maybe_split_pgid(OSDMapRef old_map,
                                  OSDMapRef new_map,
                                  spg_t pgid)
{
  assert(old_map->have_pg_pool(pgid.pool()));
  int old_pgnum = old_map->get_pg_num(pgid.pool());
  if (pgid.ps() < static_cast<unsigned>(old_pgnum)) {
    set<spg_t> children;
    if (pgid.is_split(old_pgnum,
                  new_map->get_pg_num(pgid.pool()), &children)) { 
      _start_split(pgid, children); }
  } else {
    assert(pgid.ps() < static_cast<unsigned>(new_map->get_pg_num(pgid.pool())));
  }
}

void OSDService::init_splits_between(spg_t pgid,
                                     OSDMapRef frommap,
                                     OSDMapRef tomap)
{
  // First, check whether we can avoid this potentially expensive check
  if (tomap->have_pg_pool(pgid.pool()) &&
      pgid.is_split(
        frommap->get_pg_num(pgid.pool()),
        tomap->get_pg_num(pgid.pool()),
        NULL)) {
    // Ok, a split happened, so we need to walk the osdmaps
    set<spg_t> new_pgs; // pgs to scan on each map
    new_pgs.insert(pgid);
    OSDMapRef curmap(get_map(frommap->get_epoch()));
    for (epoch_t e = frommap->get_epoch() + 1;
         e <= tomap->get_epoch();
         ++e) {
      OSDMapRef nextmap(try_get_map(e));
      if (!nextmap)
        continue;
      set<spg_t> even_newer_pgs; // pgs added in this loop
      for (set<spg_t>::iterator i = new_pgs.begin(); i != new_pgs.end(); ++i) {
        set<spg_t> split_pgs;
        if (i->is_split(curmap->get_pg_num(i->pool()),
                        nextmap->get_pg_num(i->pool()),
                        &split_pgs)) {
          start_split(*i, split_pgs);
          even_newer_pgs.insert(split_pgs.begin(), split_pgs.end());
        }
      }
      new_pgs.insert(even_newer_pgs.begin(), even_newer_pgs.end());
      curmap = nextmap;
    }
    assert(curmap == tomap); // we must have had both frommap and tomap
  }
}

void OSDService::expand_pg_num(OSDMapRef old_map,
                               OSDMapRef new_map)
{
  Mutex::Locker l(in_progress_split_lock);
  for (set<spg_t>::iterator i = in_progress_splits.begin();
       i != in_progress_splits.end();
    ) {
    if (!new_map->have_pg_pool(i->pool())) {
      in_progress_splits.erase(i++);
    } else {
      _maybe_split_pgid(old_map, new_map, *i);
      ++i;
    }
  }
  for (map<spg_t, spg_t>::iterator i = pending_splits.begin();
       i != pending_splits.end();
    ) {
    if (!new_map->have_pg_pool(i->first.pool())) {
      rev_pending_splits.erase(i->second);
      pending_splits.erase(i++);
    } else {
      _maybe_split_pgid(old_map, new_map, i->first);
      ++i;
    }
  }
}

bool OSDService::splitting(spg_t pgid)
{
  Mutex::Locker l(in_progress_split_lock);
  return in_progress_splits.count(pgid) ||
    pending_splits.count(pgid);
}

void OSDService::complete_split(const set<spg_t> &pgs)
{
  Mutex::Locker l(in_progress_split_lock);
  for (set<spg_t>::const_iterator i = pgs.begin();
       i != pgs.end();
       ++i) {
    dout(10) << __func__ << ": Completing split on pg " << *i << dendl;
    assert(!pending_splits.count(*i));
    assert(in_progress_splits.count(*i));
    in_progress_splits.erase(*i);
  }
}

void OSDService::need_heartbeat_peer_update()
{
  osd->need_heartbeat_peer_update();
}

void OSDService::pg_stat_queue_enqueue(PG *pg)
{
  osd->pg_stat_queue_enqueue(pg);
}

void OSDService::pg_stat_queue_dequeue(PG *pg)
{
  osd->pg_stat_queue_dequeue(pg);
}

void OSDService::start_shutdown()
{
  {
    Mutex::Locker l(agent_timer_lock);
    agent_timer.shutdown();
  }

  {
    Mutex::Locker l(recovery_sleep_lock);
    recovery_sleep_timer.shutdown();
  }
}

void OSDService::shutdown_reserver()
{
  reserver_finisher.wait_for_empty();
  reserver_finisher.stop();
}

void OSDService::shutdown()
{
  {
    Mutex::Locker l(watch_lock);
    watch_timer.shutdown();
  }

  objecter->shutdown();
  objecter_finisher.wait_for_empty();
  objecter_finisher.stop();

  {
    Mutex::Locker l(recovery_request_lock);
    recovery_request_timer.shutdown();
  }

  {
    Mutex::Locker l(snap_sleep_lock);
    snap_sleep_timer.shutdown();
  }

  {
    Mutex::Locker l(scrub_sleep_lock);
    scrub_sleep_timer.shutdown();
  }

  osdmap = OSDMapRef();
  next_osdmap = OSDMapRef();
}

void OSDService::init()
{
  reserver_finisher.start();
  objecter_finisher.start();
  objecter->set_client_incarnation(0);

  // deprioritize objecter in daemonperf output
  objecter->get_logger()->set_prio_adjust(-3);

  watch_timer.init();
  agent_timer.init();
  snap_sleep_timer.init();
  scrub_sleep_timer.init();

  agent_thread.create("osd_srv_agent");

  if (cct->_conf->osd_recovery_delay_start)
    defer_recovery(cct->_conf->osd_recovery_delay_start);
}

void OSDService::final_init()
{
  objecter->start(osdmap.get());
}

void OSDService::activate_map()
{
  // wake/unwake the tiering agent
  agent_lock.Lock();
  agent_active =
    !osdmap->test_flag(CEPH_OSDMAP_NOTIERAGENT) &&
    osd->is_active();
  agent_cond.Signal();
  agent_lock.Unlock();
}

class AgentTimeoutCB : public Context {
  PGRef pg;
public:
  explicit AgentTimeoutCB(PGRef _pg) : pg(_pg) {}
  void finish(int) override {
    pg->agent_choose_mode_restart();
  }
};

void OSDService::agent_entry()
{
  dout(10) << __func__ << " start" << dendl;
  agent_lock.Lock();

  while (!agent_stop_flag) {
    if (agent_queue.empty()) {
      dout(20) << __func__ << " empty queue" << dendl;
      agent_cond.Wait(agent_lock);
      continue;
    }
    uint64_t level = agent_queue.rbegin()->first;
    set<PGRef>& top = agent_queue.rbegin()->second;
    dout(10) << __func__
             << " tiers " << agent_queue.size()
             << ", top is " << level
             << " with pgs " << top.size()
             << ", ops " << agent_ops << "/"
             << cct->_conf->osd_agent_max_ops
             << (agent_active ? " active" : " NOT ACTIVE")
             << dendl;
    dout(20) << __func__ << " oids " << agent_oids << dendl;
    int max = cct->_conf->osd_agent_max_ops - agent_ops;
    int agent_flush_quota = max;
    if (!flush_mode_high_count)
      agent_flush_quota = cct->_conf->osd_agent_max_low_ops - agent_ops;
    if (agent_flush_quota <= 0 || top.empty() || !agent_active) {
      agent_cond.Wait(agent_lock);
      continue;
    }

    if (!agent_valid_iterator || agent_queue_pos == top.end()) {
      agent_queue_pos = top.begin();
      agent_valid_iterator = true;
    }
    PGRef pg = *agent_queue_pos;
    dout(10) << "high_count " << flush_mode_high_count
             << " agent_ops " << agent_ops
             << " flush_quota " << agent_flush_quota << dendl;
    agent_lock.Unlock();
    if (!pg->agent_work(max, agent_flush_quota)) {
      dout(10) << __func__ << " " << pg->get_pgid()
        << " no agent_work, delay for " << cct->_conf->osd_agent_delay_time
        << " seconds" << dendl;

      osd->logger->inc(l_osd_tier_delay);
      // Queue a timer to call agent_choose_mode for this pg in 5 seconds
      agent_timer_lock.Lock();
      Context *cb = new AgentTimeoutCB(pg);
      agent_timer.add_event_after(cct->_conf->osd_agent_delay_time, cb);
      agent_timer_lock.Unlock();
    }
    agent_lock.Lock();
  }
  agent_lock.Unlock();
  dout(10) << __func__ << " finish" << dendl;
}

void OSDService::agent_stop()
{
  {
    Mutex::Locker l(agent_lock);

    // By this time all ops should be cancelled
    assert(agent_ops == 0);
    // By this time all PGs are shutdown and dequeued
    if (!agent_queue.empty()) {
      set<PGRef>& top = agent_queue.rbegin()->second;
      derr << "agent queue not empty, for example " << (*top.begin())->info.pgid << dendl;
      assert(0 == "agent queue not empty");
    }

    agent_stop_flag = true;
    agent_cond.Signal();
  }
  agent_thread.join();
}

// -------------------------------------

void OSDService::promote_throttle_recalibrate()
{
  utime_t now = ceph_clock_now();
  double dur = now - last_recalibrate;
  last_recalibrate = now;
  unsigned prob = promote_probability_millis;

  uint64_t target_obj_sec = cct->_conf->osd_tier_promote_max_objects_sec;
  uint64_t target_bytes_sec = cct->_conf->osd_tier_promote_max_bytes_sec;

  unsigned min_prob = 1;

  uint64_t attempts, obj, bytes;
  promote_counter.sample_and_attenuate(&attempts, &obj, &bytes);
  dout(10) << __func__ << " " << attempts << " attempts, promoted "
           << obj << " objects and " << pretty_si_t(bytes) << " bytes; target "
           << target_obj_sec << " obj/sec or "
           << pretty_si_t(target_bytes_sec) << " bytes/sec"
           << dendl;

  // calculate what the probability *should* be, given the targets
  unsigned new_prob;
  if (attempts && dur > 0) {
    uint64_t avg_size = 1;
    if (obj)
      avg_size = MAX(bytes / obj, 1);
    unsigned po = (double)target_obj_sec * dur * 1000.0 / (double)attempts;
    unsigned pb = (double)target_bytes_sec / (double)avg_size * dur * 1000.0
      / (double)attempts;
    dout(20) << __func__ << "  po " << po << " pb " << pb << " avg_size "
             << avg_size << dendl;
    if (target_obj_sec && target_bytes_sec)
      new_prob = MIN(po, pb);
    else if (target_obj_sec)
      new_prob = po;
    else if (target_bytes_sec)
      new_prob = pb;
    else
      new_prob = 1000;
  } else {
    new_prob = 1000;
  }
  dout(20) << __func__ << "  new_prob " << new_prob << dendl;

  // correct for persistent skew between target rate and actual rate, adjust
  double ratio = 1.0;
  unsigned actual = 0;
  if (attempts && obj) {
    actual = obj * 1000 / attempts;
    ratio = (double)actual / (double)prob;
    new_prob = (double)new_prob / ratio;
  }
  new_prob = MAX(new_prob, min_prob);
  new_prob = MIN(new_prob, 1000);

  // adjust
  prob = (prob + new_prob) / 2;
  prob = MAX(prob, min_prob);
  prob = MIN(prob, 1000);
  dout(10) << __func__ << "  actual " << actual
           << ", actual/prob ratio " << ratio
           << ", adjusted new_prob " << new_prob
           << ", prob " << promote_probability_millis << " -> " << prob
           << dendl;
  promote_probability_millis = prob;

  // set hard limits for this interval to mitigate stampedes
  promote_max_objects = target_obj_sec * OSD::OSD_TICK_INTERVAL * 2;
  promote_max_bytes = target_bytes_sec * OSD::OSD_TICK_INTERVAL * 2;
}

// -------------------------------------

float OSDService::get_failsafe_full_ratio()
{
  float full_ratio = cct->_conf->osd_failsafe_full_ratio;
  if (full_ratio > 1.0) full_ratio /= 100.0;
  return full_ratio;
}

void OSDService::check_full_status(float ratio)
{
  Mutex::Locker l(full_status_lock);

  cur_ratio = ratio;

  // The OSDMap ratios take precendence.  So if the failsafe is .95 and
  // the admin sets the cluster full to .96, the failsafe moves up to .96
  // too.  (Not that having failsafe == full is ideal, but it's better than
  // dropping writes before the clusters appears full.)
  OSDMapRef osdmap = get_osdmap();
  if (!osdmap || osdmap->get_epoch() == 0) {
    cur_state = NONE;
    return;
  }
  float nearfull_ratio = osdmap->get_nearfull_ratio();
  float backfillfull_ratio = std::max(osdmap->get_backfillfull_ratio(), nearfull_ratio);
  float full_ratio = std::max(osdmap->get_full_ratio(), backfillfull_ratio);
  float failsafe_ratio = std::max(get_failsafe_full_ratio(), full_ratio);

  if (osdmap->require_osd_release < CEPH_RELEASE_LUMINOUS) {
    // use the failsafe for nearfull and full; the mon isn't using the
    // flags anyway because we're mid-upgrade.
    full_ratio = failsafe_ratio;
    backfillfull_ratio = failsafe_ratio;
    nearfull_ratio = failsafe_ratio;
  } else if (full_ratio <= 0 ||
             backfillfull_ratio <= 0 ||
             nearfull_ratio <= 0) {
    derr << __func__ << " full_ratio, backfillfull_ratio or nearfull_ratio is <= 0" << dendl;
    // use failsafe flag.  ick.  the monitor did something wrong or the user
    // did something stupid.
    full_ratio = failsafe_ratio;
    backfillfull_ratio = failsafe_ratio;
    nearfull_ratio = failsafe_ratio;
  }

  string inject;
  s_names new_state;
  if (injectfull_state > NONE && injectfull) {
    new_state = injectfull_state;
    inject = "(Injected)";
  } else if (ratio > failsafe_ratio) {
    new_state = FAILSAFE;
  } else if (ratio > full_ratio) {
    new_state = FULL;
  } else if (ratio > backfillfull_ratio) {
    new_state = BACKFILLFULL;
  } else if (ratio > nearfull_ratio) {
    new_state = NEARFULL;
  } else {
    new_state = NONE;
  }
  dout(20) << __func__ << " cur ratio " << ratio
           << ". nearfull_ratio " << nearfull_ratio
           << ". backfillfull_ratio " << backfillfull_ratio
           << ", full_ratio " << full_ratio
           << ", failsafe_ratio " << failsafe_ratio
           << ", new state " << get_full_state_name(new_state)
           << " " << inject
           << dendl;

  // warn
  if (cur_state != new_state) {
    dout(10) << __func__ << " " << get_full_state_name(cur_state)
             << " -> " << get_full_state_name(new_state) << dendl;
    if (new_state == FAILSAFE) {
      clog->error() << "failsafe engaged, dropping updates, now "
                    << (int)roundf(ratio * 100) << "% full";
    } else if (cur_state == FAILSAFE) {
      clog->error() << "failsafe disengaged, no longer dropping updates, now "
                    << (int)roundf(ratio * 100) << "% full";
    }
    cur_state = new_state;
  }
}

bool OSDService::need_fullness_update()
{
  OSDMapRef osdmap = get_osdmap();
  s_names cur = NONE;
  if (osdmap->exists(whoami)) {
    if (osdmap->get_state(whoami) & CEPH_OSD_FULL) {
      cur = FULL;
    } else if (osdmap->get_state(whoami) & CEPH_OSD_BACKFILLFULL) {
      cur = BACKFILLFULL;
    } else if (osdmap->get_state(whoami) & CEPH_OSD_NEARFULL) {
      cur = NEARFULL;
    }
  }
  s_names want = NONE;
  if (is_full())
    want = FULL;
  else if (is_backfillfull())
    want = BACKFILLFULL;
  else if (is_nearfull())
    want = NEARFULL;
  return want != cur;
}

bool OSDService::_check_full(s_names type, ostream &ss) const
{
  Mutex::Locker l(full_status_lock);

  if (injectfull && injectfull_state >= type) {
    // injectfull is either a count of the number of times to return failsafe full
    // or if -1 then always return full
    if (injectfull > 0)
      --injectfull;
    ss << "Injected " << get_full_state_name(type) << " OSD ("
       << (injectfull < 0 ? "set" : std::to_string(injectfull)) << ")";
    return true;
  }

  ss << "current usage is " << cur_ratio;
  return cur_state >= type;
}

bool OSDService::check_failsafe_full(ostream &ss) const
{
  return _check_full(FAILSAFE, ss);
}

bool OSDService::check_full(ostream &ss) const
{
  return _check_full(FULL, ss);
}

bool OSDService::check_backfill_full(ostream &ss) const
{
  return _check_full(BACKFILLFULL, ss);
}

bool OSDService::check_nearfull(ostream &ss) const
{
  return _check_full(NEARFULL, ss);
}

bool OSDService::is_failsafe_full() const
{
  Mutex::Locker l(full_status_lock);
  return cur_state == FAILSAFE;
}

bool OSDService::is_full() const
{
  Mutex::Locker l(full_status_lock);
  return cur_state >= FULL;
}

bool OSDService::is_backfillfull() const
{
  Mutex::Locker l(full_status_lock);
  return cur_state >= BACKFILLFULL;
}

bool OSDService::is_nearfull() const
{
  Mutex::Locker l(full_status_lock);
  return cur_state >= NEARFULL;
}

void OSDService::set_injectfull(s_names type, int64_t count)
{
  Mutex::Locker l(full_status_lock);
  injectfull_state = type;
  injectfull = count;
}

osd_stat_t OSDService::set_osd_stat(const struct store_statfs_t &stbuf,
                                    vector<int>& hb_peers)
{
  uint64_t bytes = stbuf.total;
  uint64_t used = bytes - stbuf.available;
  uint64_t avail = stbuf.available;

  osd->logger->set(l_osd_stat_bytes, bytes);
  osd->logger->set(l_osd_stat_bytes_used, used);
  osd->logger->set(l_osd_stat_bytes_avail, avail);

  {
    Mutex::Locker l(stat_lock);
    osd_stat.hb_peers.swap(hb_peers);
    osd->op_tracker.get_age_ms_histogram(&osd_stat.op_queue_age_hist);
    osd_stat.kb = bytes >> 10;
    osd_stat.kb_used = used >> 10;
    osd_stat.kb_avail = avail >> 10;
    return osd_stat;
  }
}

void OSDService::update_osd_stat(vector<int>& hb_peers)
{
  // load osd stats first
  struct store_statfs_t stbuf;
  int r = osd->store->statfs(&stbuf);
  if (r < 0) {
    derr << "statfs() failed: " << cpp_strerror(r) << dendl;
    return;
  }

  auto new_stat = set_osd_stat(stbuf, hb_peers);
  dout(20) << "update_osd_stat " << new_stat << dendl;
  assert(new_stat.kb);
  float ratio = ((float)new_stat.kb_used) / ((float)new_stat.kb);
  check_full_status(ratio);
}

bool OSDService::check_osdmap_full(const set<pg_shard_t> &missing_on)
{
  OSDMapRef osdmap = get_osdmap();
  for (auto shard : missing_on) {
    if (osdmap->get_state(shard.osd) & CEPH_OSD_FULL)
      return true;
  }
  return false;
}

void OSDService::send_message_osd_cluster(int peer, Message *m, epoch_t from_epoch)
{
  OSDMapRef next_map = get_nextmap_reserved();
  // service map is always newer/newest
  assert(from_epoch <= next_map->get_epoch());

  if (next_map->is_down(peer) ||
      next_map->get_info(peer).up_from > from_epoch) {
    m->put();
    release_map(next_map);
    return;
  }
  const entity_inst_t& peer_inst = next_map->get_cluster_inst(peer);
  ConnectionRef peer_con = osd->cluster_messenger->get_connection(peer_inst);
  share_map_peer(peer, peer_con.get(), next_map);
  peer_con->send_message(m);
  release_map(next_map);
}

ConnectionRef OSDService::get_con_osd_cluster(int peer, epoch_t from_epoch)
{
  OSDMapRef next_map = get_nextmap_reserved();
  // service map is always newer/newest
  assert(from_epoch <= next_map->get_epoch());

  if (next_map->is_down(peer) ||
      next_map->get_info(peer).up_from > from_epoch) {
    release_map(next_map);
    return NULL;
  }
  ConnectionRef con = osd->cluster_messenger->get_connection(next_map->get_cluster_inst(peer));
  release_map(next_map);
  return con;
}

pair<ConnectionRef,ConnectionRef> OSDService::get_con_osd_hb(int peer, epoch_t from_epoch)
{
  OSDMapRef next_map = get_nextmap_reserved();
  // service map is always newer/newest
  assert(from_epoch <= next_map->get_epoch());

  pair<ConnectionRef,ConnectionRef> ret;
  if (next_map->is_down(peer) ||
      next_map->get_info(peer).up_from > from_epoch) {
    release_map(next_map);
    return ret;
  }
  ret.first = osd->hb_back_client_messenger->get_connection(next_map->get_hb_back_inst(peer));
  if (next_map->get_hb_front_addr(peer) != entity_addr_t())
    ret.second = osd->hb_front_client_messenger->get_connection(next_map->get_hb_front_inst(peer));
  release_map(next_map);
  return ret;
}


void OSDService::queue_want_pg_temp(pg_t pgid, vector<int>& want)
{
  Mutex::Locker l(pg_temp_lock);
  map<pg_t,vector<int> >::iterator p = pg_temp_pending.find(pgid);
  if (p == pg_temp_pending.end() ||
      p->second != want) {
    pg_temp_wanted[pgid] = want;
  }
}

void OSDService::remove_want_pg_temp(pg_t pgid)
{
  Mutex::Locker l(pg_temp_lock);
  pg_temp_wanted.erase(pgid);
  pg_temp_pending.erase(pgid);
}

void OSDService::_sent_pg_temp()
{
  for (map<pg_t,vector<int> >::iterator p = pg_temp_wanted.begin();
       p != pg_temp_wanted.end();
       ++p)
    pg_temp_pending[p->first] = p->second;
  pg_temp_wanted.clear();
}

void OSDService::requeue_pg_temp()
{
  Mutex::Locker l(pg_temp_lock);
  // wanted overrides pending.  note that remove_want_pg_temp
  // clears the item out of both.
  unsigned old_wanted = pg_temp_wanted.size();
  unsigned old_pending = pg_temp_pending.size();
  _sent_pg_temp();
  pg_temp_wanted.swap(pg_temp_pending);
  dout(10) << __func__ << " " << old_wanted << " + " << old_pending << " -> "
           << pg_temp_wanted.size() << dendl;
}

void OSDService::send_pg_temp()
{
  Mutex::Locker l(pg_temp_lock);
  if (pg_temp_wanted.empty())
    return;
  dout(10) << "send_pg_temp " << pg_temp_wanted << dendl;
  MOSDPGTemp *m = new MOSDPGTemp(osdmap->get_epoch());
  m->pg_temp = pg_temp_wanted;
  monc->send_mon_message(m);
  _sent_pg_temp();
}

void OSDService::send_pg_created(pg_t pgid)
{
  dout(20) << __func__ << dendl;
  monc->send_mon_message(new MOSDPGCreated(pgid));
}

// --------------------------------------
// dispatch

epoch_t OSDService::get_peer_epoch(int peer)
{
  Mutex::Locker l(peer_map_epoch_lock);
  map<int,epoch_t>::iterator p = peer_map_epoch.find(peer);
  if (p == peer_map_epoch.end())
    return 0;
  return p->second;
}

epoch_t OSDService::note_peer_epoch(int peer, epoch_t e)
{
  Mutex::Locker l(peer_map_epoch_lock);
  map<int,epoch_t>::iterator p = peer_map_epoch.find(peer);
  if (p != peer_map_epoch.end()) {
    if (p->second < e) {
      dout(10) << "note_peer_epoch osd." << peer << " has " << e << dendl;
      p->second = e;
    } else {
      dout(30) << "note_peer_epoch osd." << peer << " has " << p->second << " >= " << e << dendl;
    }
    return p->second;
  } else {
    dout(10) << "note_peer_epoch osd." << peer << " now has " << e << dendl;
    peer_map_epoch[peer] = e;
    return e;
  }
}

void OSDService::forget_peer_epoch(int peer, epoch_t as_of)
{
  Mutex::Locker l(peer_map_epoch_lock);
  map<int,epoch_t>::iterator p = peer_map_epoch.find(peer);
  if (p != peer_map_epoch.end()) {
    if (p->second <= as_of) {
      dout(10) << "forget_peer_epoch osd." << peer << " as_of " << as_of
               << " had " << p->second << dendl;
      peer_map_epoch.erase(p);
    } else {
      dout(10) << "forget_peer_epoch osd." << peer << " as_of " << as_of
               << " has " << p->second << " - not forgetting" << dendl;
    }
  }
}

bool OSDService::should_share_map(entity_name_t name, Connection *con,
                                  epoch_t epoch, const OSDMapRef& osdmap,
                                  const epoch_t *sent_epoch_p)
{
  dout(20) << "should_share_map "
           << name << " " << con->get_peer_addr()
           << " " << epoch << dendl;

  // does client have old map?
  if (name.is_client()) {
    bool message_sendmap = epoch < osdmap->get_epoch();
    if (message_sendmap && sent_epoch_p) {
      dout(20) << "client session last_sent_epoch: "
               << *sent_epoch_p
               << " versus osdmap epoch " << osdmap->get_epoch() << dendl;
      if (*sent_epoch_p < osdmap->get_epoch()) {
        return true;
      } // else we don't need to send it out again
    }
  }

  if (con->get_messenger() == osd->cluster_messenger &&
      con != osd->cluster_messenger->get_loopback_connection() &&
      osdmap->is_up(name.num()) &&
      (osdmap->get_cluster_addr(name.num()) == con->get_peer_addr() ||
       osdmap->get_hb_back_addr(name.num()) == con->get_peer_addr())) {
    // remember
    epoch_t has = MAX(get_peer_epoch(name.num()), epoch);

    // share?
    if (has < osdmap->get_epoch()) {
      dout(10) << name << " " << con->get_peer_addr()
               << " has old map " << epoch << " < "
               << osdmap->get_epoch() << dendl;
      return true;
    }
  }

  return false;
}

void OSDService::share_map(
    entity_name_t name,
    Connection *con,
    epoch_t epoch,
    OSDMapRef& osdmap,
    epoch_t *sent_epoch_p)
{
  dout(20) << "share_map "
           << name << " " << con->get_peer_addr()
           << " " << epoch << dendl;

  if (!osd->is_active()) {
    /*It is safe not to proceed as OSD is not in healthy state*/
    return;
  }

  bool want_shared = should_share_map(name, con, epoch,
                                      osdmap, sent_epoch_p);

  if (want_shared){
    if (name.is_client()) {
      dout(10) << name << " has old map " << epoch
          << " < " << osdmap->get_epoch() << dendl;
      // we know the Session is valid or we wouldn't be sending
      if (sent_epoch_p) {
        *sent_epoch_p = osdmap->get_epoch();
      }
      send_incremental_map(epoch, con, osdmap);
    } else if (con->get_messenger() == osd->cluster_messenger &&
        osdmap->is_up(name.num()) &&
        (osdmap->get_cluster_addr(name.num()) == con->get_peer_addr() ||
            osdmap->get_hb_back_addr(name.num()) == con->get_peer_addr())) {
      dout(10) << name << " " << con->get_peer_addr()
                       << " has old map " << epoch << " < "
                       << osdmap->get_epoch() << dendl;
      note_peer_epoch(name.num(), osdmap->get_epoch());
      send_incremental_map(epoch, con, osdmap);
    }
  }
}

void OSDService::share_map_peer(int peer, Connection *con, OSDMapRef map)
{
  if (!map)
    map = get_osdmap();

  // send map?
  epoch_t pe = get_peer_epoch(peer);
  if (pe) {
    if (pe < map->get_epoch()) {
      send_incremental_map(pe, con, map);
      note_peer_epoch(peer, map->get_epoch());
    } else
      dout(20) << "share_map_peer " << con << " already has epoch " << pe << dendl;
  } else {
    dout(20) << "share_map_peer " << con << " don't know epoch, doing nothing" << dendl;
    // no idea about peer's epoch.
    // ??? send recent ???
    // do nothing.
  }
}

bool OSDService::can_inc_scrubs_pending()
{
  bool can_inc = false;
  Mutex::Locker l(sched_scrub_lock);

  if (scrubs_pending + scrubs_active < cct->_conf->osd_max_scrubs) {
    dout(20) << __func__ << " " << scrubs_pending << " -> " << (scrubs_pending+1)
             << " (max " << cct->_conf->osd_max_scrubs << ", active " << scrubs_active << ")" << dendl;
    can_inc = true;
  } else {
    dout(20) << __func__ << scrubs_pending << " + " << scrubs_active << " active >= max " << cct->_conf->osd_max_scrubs << dendl;
  }

  return can_inc;
}

bool OSDService::inc_scrubs_pending()
{
  bool result = false;

  sched_scrub_lock.Lock();
  if (scrubs_pending + scrubs_active < cct->_conf->osd_max_scrubs) {
    dout(20) << "inc_scrubs_pending " << scrubs_pending << " -> " << (scrubs_pending+1)
             << " (max " << cct->_conf->osd_max_scrubs << ", active " << scrubs_active << ")" << dendl;
    result = true;
    ++scrubs_pending;
  } else {
    dout(20) << "inc_scrubs_pending " << scrubs_pending << " + " << scrubs_active << " active >= max " << cct->_conf->osd_max_scrubs << dendl;
  }
  sched_scrub_lock.Unlock();

  return result;
}

void OSDService::dec_scrubs_pending()
{
  sched_scrub_lock.Lock();
  dout(20) << "dec_scrubs_pending " << scrubs_pending << " -> " << (scrubs_pending-1)
           << " (max " << cct->_conf->osd_max_scrubs << ", active " << scrubs_active << ")" << dendl;
  --scrubs_pending;
  assert(scrubs_pending >= 0);
  sched_scrub_lock.Unlock();
}

void OSDService::inc_scrubs_active(bool reserved)
{
  sched_scrub_lock.Lock();
  ++(scrubs_active);
  if (reserved) {
    --(scrubs_pending);
    dout(20) << "inc_scrubs_active " << (scrubs_active-1) << " -> " << scrubs_active
             << " (max " << cct->_conf->osd_max_scrubs
             << ", pending " << (scrubs_pending+1) << " -> " << scrubs_pending << ")" << dendl;
    assert(scrubs_pending >= 0);
  } else {
    dout(20) << "inc_scrubs_active " << (scrubs_active-1) << " -> " << scrubs_active
             << " (max " << cct->_conf->osd_max_scrubs
             << ", pending " << scrubs_pending << ")" << dendl;
  }
  sched_scrub_lock.Unlock();
}

void OSDService::dec_scrubs_active()
{
  sched_scrub_lock.Lock();
  dout(20) << "dec_scrubs_active " << scrubs_active << " -> " << (scrubs_active-1)
           << " (max " << cct->_conf->osd_max_scrubs << ", pending " << scrubs_pending << ")" << dendl;
  --scrubs_active;
  assert(scrubs_active >= 0);
  sched_scrub_lock.Unlock();
}

void OSDService::retrieve_epochs(epoch_t *_boot_epoch, epoch_t *_up_epoch,
                                 epoch_t *_bind_epoch) const
{
  Mutex::Locker l(epoch_lock);
  if (_boot_epoch)
    *_boot_epoch = boot_epoch;
  if (_up_epoch)
    *_up_epoch = up_epoch;
  if (_bind_epoch)
    *_bind_epoch = bind_epoch;
}

void OSDService::set_epochs(const epoch_t *_boot_epoch, const epoch_t *_up_epoch,
                            const epoch_t *_bind_epoch)
{
  Mutex::Locker l(epoch_lock);
  if (_boot_epoch) {
    assert(*_boot_epoch == 0 || *_boot_epoch >= boot_epoch);
    boot_epoch = *_boot_epoch;
  }
  if (_up_epoch) {
    assert(*_up_epoch == 0 || *_up_epoch >= up_epoch);
    up_epoch = *_up_epoch;
  }
  if (_bind_epoch) {
    assert(*_bind_epoch == 0 || *_bind_epoch >= bind_epoch);
    bind_epoch = *_bind_epoch;
  }
}

bool OSDService::prepare_to_stop()
{
  Mutex::Locker l(is_stopping_lock);
  if (get_state() != NOT_STOPPING)
    return false;

  OSDMapRef osdmap = get_osdmap();
  if (osdmap && osdmap->is_up(whoami)) {
    dout(0) << __func__ << " telling mon we are shutting down" << dendl;
    set_state(PREPARING_TO_STOP);
    monc->send_mon_message(new MOSDMarkMeDown(monc->get_fsid(),
                                              osdmap->get_inst(whoami),
                                              osdmap->get_epoch(),
                                              true  // request ack
                                              ));
    utime_t now = ceph_clock_now();
    utime_t timeout;
    timeout.set_from_double(now + cct->_conf->osd_mon_shutdown_timeout);
    while ((ceph_clock_now() < timeout) &&
       (get_state() != STOPPING)) {
      is_stopping_cond.WaitUntil(is_stopping_lock, timeout);
    }
  }
  dout(0) << __func__ << " starting shutdown" << dendl;
  set_state(STOPPING);
  return true;
}

void OSDService::got_stop_ack()
{
  Mutex::Locker l(is_stopping_lock);
  if (get_state() == PREPARING_TO_STOP) {
    dout(0) << __func__ << " starting shutdown" << dendl;
    set_state(STOPPING);
    is_stopping_cond.Signal();
  } else {
    dout(10) << __func__ << " ignoring msg" << dendl;
  }
}

MOSDMap *OSDService::build_incremental_map_msg(epoch_t since, epoch_t to,
                                               OSDSuperblock& sblock)
{
  MOSDMap *m = new MOSDMap(monc->get_fsid());
  m->oldest_map = max_oldest_map;
  m->newest_map = sblock.newest_map;

  for (epoch_t e = to; e > since; e--) {
    bufferlist bl;
    if (e > m->oldest_map && get_inc_map_bl(e, bl)) {
      m->incremental_maps[e].claim(bl);
    } else if (get_map_bl(e, bl)) {
      m->maps[e].claim(bl);
      break;
    } else {
      derr << "since " << since << " to " << to
           << " oldest " << m->oldest_map << " newest " << m->newest_map
           << dendl;
      m->put();
      m = NULL;
      break;
    }
  }
  return m;
}

void OSDService::send_map(MOSDMap *m, Connection *con)
{
  con->send_message(m);
}

void OSDService::send_incremental_map(epoch_t since, Connection *con,
                                      OSDMapRef& osdmap)
{
  epoch_t to = osdmap->get_epoch();
  dout(10) << "send_incremental_map " << since << " -> " << to
           << " to " << con << " " << con->get_peer_addr() << dendl;

  MOSDMap *m = NULL;
  while (!m) {
    OSDSuperblock sblock(get_superblock());
    if (since < sblock.oldest_map) {
      // just send latest full map
      MOSDMap *m = new MOSDMap(monc->get_fsid());
      m->oldest_map = max_oldest_map;
      m->newest_map = sblock.newest_map;
      get_map_bl(to, m->maps[to]);
      send_map(m, con);
      return;
    }

    if (to > since && (int64_t)(to - since) > cct->_conf->osd_map_share_max_epochs) {
      dout(10) << "  " << (to - since) << " > max " << cct->_conf->osd_map_share_max_epochs
               << ", only sending most recent" << dendl;
      since = to - cct->_conf->osd_map_share_max_epochs;
    }

    if (to - since > (epoch_t)cct->_conf->osd_map_message_max)
      to = since + cct->_conf->osd_map_message_max;
    m = build_incremental_map_msg(since, to, sblock);
  }
  send_map(m, con);
}

bool OSDService::_get_map_bl(epoch_t e, bufferlist& bl)
{
  bool found = map_bl_cache.lookup(e, &bl);
  if (found) {
    if (logger)
      logger->inc(l_osd_map_bl_cache_hit);
    return true;
  }
  if (logger)
    logger->inc(l_osd_map_bl_cache_miss);
  found = store->read(coll_t::meta(),
                      OSD::get_osdmap_pobject_name(e), 0, 0, bl,
                      CEPH_OSD_OP_FLAG_FADVISE_WILLNEED) >= 0;
  if (found) {
    _add_map_bl(e, bl);
  }
  return found;
}

bool OSDService::get_inc_map_bl(epoch_t e, bufferlist& bl)
{
  Mutex::Locker l(map_cache_lock);
  bool found = map_bl_inc_cache.lookup(e, &bl);
  if (found) {
    if (logger)
      logger->inc(l_osd_map_bl_cache_hit);
    return true;
  }
  if (logger)
    logger->inc(l_osd_map_bl_cache_miss);
  found = store->read(coll_t::meta(),
                      OSD::get_inc_osdmap_pobject_name(e), 0, 0, bl,
                      CEPH_OSD_OP_FLAG_FADVISE_WILLNEED) >= 0;
  if (found) {
    _add_map_inc_bl(e, bl);
  }
  return found;
}

void OSDService::_add_map_bl(epoch_t e, bufferlist& bl)
{
  dout(10) << "add_map_bl " << e << " " << bl.length() << " bytes" << dendl;
  // cache a contiguous buffer
  if (bl.get_num_buffers() > 1) {
    bl.rebuild();
  }
  bl.try_assign_to_mempool(mempool::mempool_osd_mapbl);
  map_bl_cache.add(e, bl);
}

void OSDService::_add_map_inc_bl(epoch_t e, bufferlist& bl)
{
  dout(10) << "add_map_inc_bl " << e << " " << bl.length() << " bytes" << dendl;
  // cache a contiguous buffer
  if (bl.get_num_buffers() > 1) {
    bl.rebuild();
  }
  bl.try_assign_to_mempool(mempool::mempool_osd_mapbl);
  map_bl_inc_cache.add(e, bl);
}

void OSDService::pin_map_inc_bl(epoch_t e, bufferlist &bl)
{
  Mutex::Locker l(map_cache_lock);
  // cache a contiguous buffer
  if (bl.get_num_buffers() > 1) {
    bl.rebuild();
  }
  map_bl_inc_cache.pin(e, bl);
}

void OSDService::pin_map_bl(epoch_t e, bufferlist &bl)
{
  Mutex::Locker l(map_cache_lock);
  // cache a contiguous buffer
  if (bl.get_num_buffers() > 1) {
    bl.rebuild();
  }
  map_bl_cache.pin(e, bl);
}

void OSDService::clear_map_bl_cache_pins(epoch_t e)
{
  Mutex::Locker l(map_cache_lock);
  map_bl_inc_cache.clear_pinned(e);
  map_bl_cache.clear_pinned(e);
}

OSDMapRef OSDService::_add_map(OSDMap *o)
{
  epoch_t e = o->get_epoch();

  if (cct->_conf->osd_map_dedup) {
    // Dedup against an existing map at a nearby epoch
    OSDMapRef for_dedup = map_cache.lower_bound(e);
    if (for_dedup) {
      OSDMap::dedup(for_dedup.get(), o);
    }
  }
  bool existed;
  OSDMapRef l = map_cache.add(e, o, &existed);
  if (existed) {
    delete o;
  }
  return l;
}

OSDMapRef OSDService::try_get_map(epoch_t epoch)
{
  Mutex::Locker l(map_cache_lock);
  OSDMapRef retval = map_cache.lookup(epoch);
  if (retval) {
    dout(30) << "get_map " << epoch << " -cached" << dendl;
    if (logger) {
      logger->inc(l_osd_map_cache_hit);
    }
    return retval;
  }
  if (logger) {
    logger->inc(l_osd_map_cache_miss);
    epoch_t lb = map_cache.cached_key_lower_bound();
    if (epoch < lb) {
      dout(30) << "get_map " << epoch << " - miss, below lower bound" << dendl;
      logger->inc(l_osd_map_cache_miss_low);
      logger->inc(l_osd_map_cache_miss_low_avg, lb - epoch);
    }
  }

  OSDMap *map = new OSDMap;
  if (epoch > 0) {
    dout(20) << "get_map " << epoch << " - loading and decoding " << map << dendl;
    bufferlist bl;
    if (!_get_map_bl(epoch, bl) || bl.length() == 0) {
      derr << "failed to load OSD map for epoch " << epoch << ", got " << bl.length() << " bytes" << dendl;
      delete map;
      return OSDMapRef();
    }
    map->decode(bl);
  } else {
    dout(20) << "get_map " << epoch << " - return initial " << map << dendl;
  }
  return _add_map(map);
}

// ops


void OSDService::reply_op_error(OpRequestRef op, int err)
{
  reply_op_error(op, err, eversion_t(), 0);
}

void OSDService::reply_op_error(OpRequestRef op, int err, eversion_t v,
                                version_t uv)
{
  const MOSDOp *m = static_cast<const MOSDOp*>(op->get_req());
  assert(m->get_type() == CEPH_MSG_OSD_OP);
  int flags;
  flags = m->get_flags() & (CEPH_OSD_FLAG_ACK|CEPH_OSD_FLAG_ONDISK);

  MOSDOpReply *reply = new MOSDOpReply(m, err, osdmap->get_epoch(), flags,
                                       true);
  reply->set_reply_versions(v, uv);
  m->get_connection()->send_message(reply);
}

void OSDService::handle_misdirected_op(PG *pg, OpRequestRef op)
{
  if (!cct->_conf->osd_debug_misdirected_ops) {
    return;
  }

  const MOSDOp *m = static_cast<const MOSDOp*>(op->get_req());
  assert(m->get_type() == CEPH_MSG_OSD_OP);

  assert(m->get_map_epoch() >= pg->info.history.same_primary_since);

  if (pg->is_ec_pg()) {
    /**
       * OSD recomputes op target based on current OSDMap. With an EC pg, we
       * can get this result:
       * 1) client at map 512 sends an op to osd 3, pg_t 3.9 based on mapping
       *    [CRUSH_ITEM_NONE, 2, 3]/3
       * 2) OSD 3 at map 513 remaps op to osd 3, spg_t 3.9s0 based on mapping
       *    [3, 2, 3]/3
       * 3) PG 3.9s0 dequeues the op at epoch 512 and notices that it isn't primary
       *    -- misdirected op
       * 4) client resends and this time PG 3.9s0 having caught up to 513 gets
       *    it and fulfils it
       *
       * We can't compute the op target based on the sending map epoch due to
       * splitting.  The simplest thing is to detect such cases here and drop
       * them without an error (the client will resend anyway).
       */
    assert(m->get_map_epoch() <= superblock.newest_map);
    OSDMapRef opmap = try_get_map(m->get_map_epoch());
    if (!opmap) {
      dout(7) << __func__ << ": " << *pg << " no longer have map for "
              << m->get_map_epoch() << ", dropping" << dendl;
      return;
    }
    pg_t _pgid = m->get_raw_pg();
    spg_t pgid;
    if ((m->get_flags() & CEPH_OSD_FLAG_PGOP) == 0)
      _pgid = opmap->raw_pg_to_pg(_pgid);
    if (opmap->get_primary_shard(_pgid, &pgid) &&
        pgid.shard != pg->info.pgid.shard) {
      dout(7) << __func__ << ": " << *pg << " primary changed since "
              << m->get_map_epoch() << ", dropping" << dendl;
      return;
    }
  }

  dout(7) << *pg << " misdirected op in " << m->get_map_epoch() << dendl;
  clog->warn() << m->get_source_inst() << " misdirected " << m->get_reqid()
               << " pg " << m->get_raw_pg()
               << " to osd." << whoami
               << " not " << pg->acting
               << " in e" << m->get_map_epoch() << "/" << osdmap->get_epoch();
}

void OSDService::enqueue_back(spg_t pgid, PGQueueable qi)
{
  osd->op_shardedwq.queue(make_pair(pgid, qi));
}

void OSDService::enqueue_front(spg_t pgid, PGQueueable qi)
{
  osd->op_shardedwq.queue_front(make_pair(pgid, qi));
}

void OSDService::queue_for_peering(PG *pg)
{
  peering_wq.queue(pg);
}

void OSDService::queue_for_snap_trim(PG *pg)
{
  dout(10) << "queueing " << *pg << " for snaptrim" << dendl;
  osd->op_shardedwq.queue(
    make_pair(
      pg->info.pgid,
      PGQueueable(
        PGSnapTrim(pg->get_osdmap()->get_epoch()),
        cct->_conf->osd_snap_trim_cost,
        cct->_conf->osd_snap_trim_priority,
        ceph_clock_now(),
        entity_inst_t(),
        pg->get_osdmap()->get_epoch())));
}


// ====================================================================
// OSD

#undef dout_prefix
#define dout_prefix *_dout

// Commands shared between OSD's console and admin console:
namespace ceph { 
namespace osd_cmds { 

int heap(CephContext& cct, cmdmap_t& cmdmap, Formatter& f, std::ostream& os);
 
}} // namespace ceph::osd_cmds

int OSD::mkfs(CephContext *cct, ObjectStore *store, const string &dev,
              uuid_d fsid, int whoami)
{
  int ret;

  ceph::shared_ptr<ObjectStore::Sequencer> osr(
    new ObjectStore::Sequencer("mkfs"));
  OSDSuperblock sb;
  bufferlist sbbl;
  C_SaferCond waiter;

  // if we are fed a uuid for this osd, use it.
  store->set_fsid(cct->_conf->osd_uuid);

  ret = store->mkfs();
  if (ret) {
    derr << "OSD::mkfs: ObjectStore::mkfs failed with error "
         << cpp_strerror(ret) << dendl;
    goto free_store;
  }

  store->set_cache_shards(1);  // doesn't matter for mkfs!

  ret = store->mount();
  if (ret) {
    derr << "OSD::mkfs: couldn't mount ObjectStore: error "
         << cpp_strerror(ret) << dendl;
    goto free_store;
  }

  ret = store->read(coll_t::meta(), OSD_SUPERBLOCK_GOBJECT, 0, 0, sbbl);
  if (ret >= 0) {
    /* if we already have superblock, check content of superblock */
    dout(0) << " have superblock" << dendl;
    bufferlist::iterator p;
    p = sbbl.begin();
    ::decode(sb, p);
    if (whoami != sb.whoami) {
      derr << "provided osd id " << whoami << " != superblock's " << sb.whoami
           << dendl;
      ret = -EINVAL;
      goto umount_store;
    }
    if (fsid != sb.cluster_fsid) {
      derr << "provided cluster fsid " << fsid
           << " != superblock's " << sb.cluster_fsid << dendl;
      ret = -EINVAL;
      goto umount_store;
    }
  } else {
    // create superblock
    sb.cluster_fsid = fsid;
    sb.osd_fsid = store->get_fsid();
    sb.whoami = whoami;
    sb.compat_features = get_osd_initial_compat_set();

    bufferlist bl;
    ::encode(sb, bl);

    ObjectStore::Transaction t;
    t.create_collection(coll_t::meta(), 0);
    t.write(coll_t::meta(), OSD_SUPERBLOCK_GOBJECT, 0, bl.length(), bl);
    ret = store->apply_transaction(osr.get(), std::move(t));
    if (ret) {
      derr << "OSD::mkfs: error while writing OSD_SUPERBLOCK_GOBJECT: "
           << "apply_transaction returned " << cpp_strerror(ret) << dendl;
      goto umount_store;
    }
  }

  if (!osr->flush_commit(&waiter)) {
    waiter.wait();
  }

  ret = write_meta(store, sb.cluster_fsid, sb.osd_fsid, whoami);
  if (ret) {
    derr << "OSD::mkfs: failed to write fsid file: error "
         << cpp_strerror(ret) << dendl;
    goto umount_store;
  }

umount_store:
  store->umount();
free_store:
  delete store;
  return ret;
}

int OSD::write_meta(ObjectStore *store, uuid_d& cluster_fsid, uuid_d& osd_fsid, int whoami)
{
  char val[80];
  int r;

  snprintf(val, sizeof(val), "%s", CEPH_OSD_ONDISK_MAGIC);
  r = store->write_meta("magic", val);
  if (r < 0)
    return r;

  snprintf(val, sizeof(val), "%d", whoami);
  r = store->write_meta("whoami", val);
  if (r < 0)
    return r;

  cluster_fsid.print(val);
  r = store->write_meta("ceph_fsid", val);
  if (r < 0)
    return r;

  r = store->write_meta("ready", "ready");
  if (r < 0)
    return r;

  return 0;
}

int OSD::peek_meta(ObjectStore *store, std::string& magic,
                   uuid_d& cluster_fsid, uuid_d& osd_fsid, int& whoami)
{
  string val;

  int r = store->read_meta("magic", &val);
  if (r < 0)
    return r;
  magic = val;

  r = store->read_meta("whoami", &val);
  if (r < 0)
    return r;
  whoami = atoi(val.c_str());

  r = store->read_meta("ceph_fsid", &val);
  if (r < 0)
    return r;
  r = cluster_fsid.parse(val.c_str());
  if (!r)
    return -EINVAL;

  r = store->read_meta("fsid", &val);
  if (r < 0) {
    osd_fsid = uuid_d();
  } else {
    r = osd_fsid.parse(val.c_str());
    if (!r)
      return -EINVAL;
  }

  return 0;
}


#undef dout_prefix
#define dout_prefix _prefix(_dout, whoami, get_osdmap_epoch())

// cons/des

OSD::OSD(CephContext *cct_, ObjectStore *store_,
         int id,
         Messenger *internal_messenger,
         Messenger *external_messenger,
         Messenger *hb_client_front,
         Messenger *hb_client_back,
         Messenger *hb_front_serverm,
         Messenger *hb_back_serverm,
         Messenger *osdc_messenger,
         MonClient *mc,
         const std::string &dev, const std::string &jdev) :
  Dispatcher(cct_),
  osd_lock("OSD::osd_lock"),
  tick_timer(cct, osd_lock),
  tick_timer_lock("OSD::tick_timer_lock"),
  tick_timer_without_osd_lock(cct, tick_timer_lock),
  authorize_handler_cluster_registry(new AuthAuthorizeHandlerRegistry(cct,
                                                                      cct->_conf->auth_supported.empty() ?
                                                                      cct->_conf->auth_cluster_required :
                                                                      cct->_conf->auth_supported)),
  authorize_handler_service_registry(new AuthAuthorizeHandlerRegistry(cct,
                                                                      cct->_conf->auth_supported.empty() ?
                                                                      cct->_conf->auth_service_required :
                                                                      cct->_conf->auth_supported)),
  cluster_messenger(internal_messenger),
  client_messenger(external_messenger),
  objecter_messenger(osdc_messenger),
  monc(mc),
  mgrc(cct_, client_messenger),
  logger(NULL),
  recoverystate_perf(NULL),
  store(store_),
  log_client(cct, client_messenger, &mc->monmap, LogClient::NO_FLAGS),
  clog(log_client.create_channel()),
  whoami(id),
  dev_path(dev), journal_path(jdev),
  store_is_rotational(store->is_rotational()),
  trace_endpoint("0.0.0.0", 0, "osd"),
  asok_hook(NULL),
  osd_compat(get_osd_compat_set()),
  peering_tp(cct, "OSD::peering_tp", "tp_peering",
             cct->_conf->osd_peering_wq_threads,
             "osd_peering_tp_threads"),
  osd_op_tp(cct, "OSD::osd_op_tp", "tp_osd_tp",
            get_num_op_threads()),
  disk_tp(cct, "OSD::disk_tp", "tp_osd_disk", cct->_conf->osd_disk_threads, "osd_disk_threads"),
  command_tp(cct, "OSD::command_tp", "tp_osd_cmd",  1),
  session_waiting_lock("OSD::session_waiting_lock"),
  heartbeat_lock("OSD::heartbeat_lock"),
  heartbeat_stop(false),
  heartbeat_need_update(true),
  hb_front_client_messenger(hb_client_front),
  hb_back_client_messenger(hb_client_back),
  hb_front_server_messenger(hb_front_serverm),
  hb_back_server_messenger(hb_back_serverm),
  daily_loadavg(0.0),
  heartbeat_thread(this),
  heartbeat_dispatcher(this),
  op_tracker(cct, cct->_conf->osd_enable_op_tracker,
                  cct->_conf->osd_num_op_tracker_shard),
  test_ops_hook(NULL),
  op_queue(get_io_queue()),
  op_prio_cutoff(get_io_prio_cut()),
  op_shardedwq(
    get_num_op_shards(),
    this,
    cct->_conf->osd_op_thread_timeout,
    cct->_conf->osd_op_thread_suicide_timeout,
    &osd_op_tp),
  peering_wq(
    this,
    cct->_conf->osd_op_thread_timeout,
    cct->_conf->osd_op_thread_suicide_timeout,
    &peering_tp),
  map_lock("OSD::map_lock"),
  pg_map_lock("OSD::pg_map_lock"),
  last_pg_create_epoch(0),
  mon_report_lock("OSD::mon_report_lock"),
  stats_ack_timeout(cct->_conf->osd_mon_ack_timeout),
  up_thru_wanted(0),
  requested_full_first(0),
  requested_full_last(0),
  pg_stat_queue_lock("OSD::pg_stat_queue_lock"),
  osd_stat_updated(false),
  pg_stat_tid(0), pg_stat_tid_flushed(0),
  command_wq(
    this,
    cct->_conf->osd_command_thread_timeout,
    cct->_conf->osd_command_thread_suicide_timeout,
    &command_tp),
  remove_wq(
    cct,
    store,
    cct->_conf->osd_remove_thread_timeout,
    cct->_conf->osd_remove_thread_suicide_timeout,
    &disk_tp),
  service(this)
{
  monc->set_messenger(client_messenger);
  op_tracker.set_complaint_and_threshold(cct->_conf->osd_op_complaint_time,
                                         cct->_conf->osd_op_log_threshold);
  op_tracker.set_history_size_and_duration(cct->_conf->osd_op_history_size,
                                           cct->_conf->osd_op_history_duration);
  op_tracker.set_history_slow_op_size_and_threshold(cct->_conf->osd_op_history_slow_op_size,
                                                    cct->_conf->osd_op_history_slow_op_threshold);
#ifdef WITH_BLKIN
  std::stringstream ss;
  ss << "osd." << whoami;
  trace_endpoint.copy_name(ss.str());
#endif
}

OSD::~OSD()
{
  delete authorize_handler_cluster_registry;
  delete authorize_handler_service_registry;
  delete class_handler;
  cct->get_perfcounters_collection()->remove(recoverystate_perf);
  cct->get_perfcounters_collection()->remove(logger);
  delete recoverystate_perf;
  delete logger;
  delete store;
}

void cls_initialize(ClassHandler *ch);

void OSD::handle_signal(int signum)
{
  assert(signum == SIGINT || signum == SIGTERM);
  derr << "*** Got signal " << sig_str(signum) << " ***" << dendl;
  shutdown();
}

int OSD::pre_init()
{
  Mutex::Locker lock(osd_lock);
  if (is_stopping())
    return 0;

  if (store->test_mount_in_use()) {
    derr << "OSD::pre_init: object store '" << dev_path << "' is "
         << "currently in use. (Is ceph-osd already running?)" << dendl;
    return -EBUSY;
  }

  cct->_conf->add_observer(this);
  return 0;
}

// asok

class OSDSocketHook : public AdminSocketHook {
  OSD *osd;
public:
  explicit OSDSocketHook(OSD *o) : osd(o) {}
  bool call(std::string admin_command, cmdmap_t& cmdmap, std::string format,
            bufferlist& out) override {
    stringstream ss;
    bool r = osd->asok_command(admin_command, cmdmap, format, ss);
    out.append(ss);
    return r;
  }
};

bool OSD::asok_command(string admin_command, cmdmap_t& cmdmap, string format,
                       ostream& ss)
{
  Formatter *f = Formatter::create(format, "json-pretty", "json-pretty");
  if (admin_command == "status") {
    f->open_object_section("status");
    f->dump_stream("cluster_fsid") << superblock.cluster_fsid;
    f->dump_stream("osd_fsid") << superblock.osd_fsid;
    f->dump_unsigned("whoami", superblock.whoami);
    f->dump_string("state", get_state_name(get_state()));
    f->dump_unsigned("oldest_map", superblock.oldest_map);
    f->dump_unsigned("newest_map", superblock.newest_map);
    {
      RWLock::RLocker l(pg_map_lock);
      f->dump_unsigned("num_pgs", pg_map.size());
    }
    f->close_section();
  } else if (admin_command == "flush_journal") {
    store->flush_journal();
  } else if (admin_command == "dump_ops_in_flight" ||
             admin_command == "ops") {
    if (!op_tracker.dump_ops_in_flight(f)) {
      ss << "op_tracker tracking is not enabled now, so no ops are tracked currently, even those get stuck. \
        Please enable \"osd_enable_op_tracker\", and the tracker will start to track new ops received afterwards.";
    }
  } else if (admin_command == "dump_blocked_ops") {
    if (!op_tracker.dump_ops_in_flight(f, true)) {
      ss << "op_tracker tracking is not enabled now, so no ops are tracked currently, even those get stuck. \
        Please enable \"osd_enable_op_tracker\", and the tracker will start to track new ops received afterwards.";
    }
  } else if (admin_command == "dump_historic_ops") {
    if (!op_tracker.dump_historic_ops(f, false)) {
      ss << "op_tracker tracking is not enabled now, so no ops are tracked currently, even those get stuck. \
        Please enable \"osd_enable_op_tracker\", and the tracker will start to track new ops received afterwards.";
    }
  } else if (admin_command == "dump_historic_ops_by_duration") {
    if (!op_tracker.dump_historic_ops(f, true)) {
      ss << "op_tracker tracking is not enabled now, so no ops are tracked currently, even those get stuck. \
        Please enable \"osd_enable_op_tracker\", and the tracker will start to track new ops received afterwards.";
    }
  } else if (admin_command == "dump_historic_slow_ops") {
    if (!op_tracker.dump_historic_slow_ops(f)) {
      ss << "op_tracker tracking is not enabled now, so no ops are tracked currently, even those get stuck. \
        Please enable \"osd_enable_op_tracker\", and the tracker will start to track new ops received afterwards.";
    }
  } else if (admin_command == "dump_op_pq_state") {
    f->open_object_section("pq");
    op_shardedwq.dump(f);
    f->close_section();
  } else if (admin_command == "dump_blacklist") {
    list<pair<entity_addr_t,utime_t> > bl;
    OSDMapRef curmap = service.get_osdmap();

    f->open_array_section("blacklist");
    curmap->get_blacklist(&bl);
    for (list<pair<entity_addr_t,utime_t> >::iterator it = bl.begin();
        it != bl.end(); ++it) {
      f->open_object_section("entry");
      f->open_object_section("entity_addr_t");
      it->first.dump(f);
      f->close_section(); //entity_addr_t
      it->second.localtime(f->dump_stream("expire_time"));
      f->close_section(); //entry
    }
    f->close_section(); //blacklist
  } else if (admin_command == "dump_watchers") {
    list<obj_watch_item_t> watchers;
    // scan pg's
    {
      Mutex::Locker l(osd_lock);
      RWLock::RLocker l2(pg_map_lock);
      for (ceph::unordered_map<spg_t,PG*>::iterator it = pg_map.begin();
          it != pg_map.end();
          ++it) {

        list<obj_watch_item_t> pg_watchers;
        PG *pg = it->second;
        pg->lock();
        pg->get_watchers(pg_watchers);
        pg->unlock();
        watchers.splice(watchers.end(), pg_watchers);
      }
    }

    f->open_array_section("watchers");
    for (list<obj_watch_item_t>::iterator it = watchers.begin();
        it != watchers.end(); ++it) {

      f->open_object_section("watch");

      f->dump_string("namespace", it->obj.nspace);
      f->dump_string("object", it->obj.oid.name);

      f->open_object_section("entity_name");
      it->wi.name.dump(f);
      f->close_section(); //entity_name_t

      f->dump_unsigned("cookie", it->wi.cookie);
      f->dump_unsigned("timeout", it->wi.timeout_seconds);

      f->open_object_section("entity_addr_t");
      it->wi.addr.dump(f);
      f->close_section(); //entity_addr_t

      f->close_section(); //watch
    }

    f->close_section(); //watchers
  } else if (admin_command == "dump_reservations") {
    f->open_object_section("reservations");
    f->open_object_section("local_reservations");
    service.local_reserver.dump(f);
    f->close_section();
    f->open_object_section("remote_reservations");
    service.remote_reserver.dump(f);
    f->close_section();
    f->close_section();
  } else if (admin_command == "get_latest_osdmap") {
    get_latest_osdmap();
  } else if (admin_command == "heap") {
    auto result = ceph::osd_cmds::heap(*cct, cmdmap, *f, ss);

    // Note: Failed heap profile commands won't necessarily trigger an error:
    f->open_object_section("result");
    f->dump_string("error", cpp_strerror(result));
    f->dump_bool("success", result >= 0);
    f->close_section();
  } else if (admin_command == "set_heap_property") {
    string property;
    int64_t value = 0;
    string error;
    bool success = false;
    if (!cmd_getval(cct, cmdmap, "property", property)) {
      error = "unable to get property";
      success = false;
    } else if (!cmd_getval(cct, cmdmap, "value", value)) {
      error = "unable to get value";
      success = false;
    } else if (value < 0) {
      error = "negative value not allowed";
      success = false;
    } else if (!ceph_heap_set_numeric_property(property.c_str(), (size_t)value)) {
      error = "invalid property";
      success = false;
    } else {
      success = true;
    }
    f->open_object_section("result");
    f->dump_string("error", error);
    f->dump_bool("success", success);
    f->close_section();
  } else if (admin_command == "get_heap_property") {
    string property;
    size_t value = 0;
    string error;
    bool success = false;
    if (!cmd_getval(cct, cmdmap, "property", property)) {
      error = "unable to get property";
      success = false;
    } else if (!ceph_heap_get_numeric_property(property.c_str(), &value)) {
      error = "invalid property";
      success = false;
    } else {
      success = true;
    }
    f->open_object_section("result");
    f->dump_string("error", error);
    f->dump_bool("success", success);
    f->dump_int("value", value);
    f->close_section();
  } else if (admin_command == "dump_objectstore_kv_stats") {
    store->get_db_statistics(f);
  } else if (admin_command == "dump_scrubs") {
    service.dumps_scrub(f);
  } else if (admin_command == "calc_objectstore_db_histogram") {
    store->generate_db_histogram(f);
  } else if (admin_command == "flush_store_cache") {
    store->flush_cache();
  } else if (admin_command == "dump_pgstate_history") {
    f->open_object_section("pgstate_history");
    RWLock::RLocker l2(pg_map_lock);
    for (ceph::unordered_map<spg_t,PG*>::iterator it = pg_map.begin();
        it != pg_map.end();
        ++it) {

      PG *pg = it->second;
      f->dump_stream("pg") << pg->get_pgid();
      pg->lock();
      pg->pgstate_history.dump(f);
      pg->unlock();
    }
    f->close_section();
  } else if (admin_command == "compact") {
    dout(1) << "triggering manual compaction" << dendl;
    auto start = ceph::coarse_mono_clock::now();
    store->compact();
    auto end = ceph::coarse_mono_clock::now();
    auto time_span = chrono::duration_cast<chrono::duration<double>>(end - start);
    dout(1) << "finished manual compaction in " 
            << time_span.count()
            << " seconds" << dendl;
    f->open_object_section("compact_result");
    f->dump_float("elapsed_time", time_span.count());
    f->close_section();
  } else {
    assert(0 == "broken asok registration");
  }
  f->flush(ss);
  delete f;
  return true;
}

class TestOpsSocketHook : public AdminSocketHook {
  OSDService *service;
  ObjectStore *store;
public:
  TestOpsSocketHook(OSDService *s, ObjectStore *st) : service(s), store(st) {}
  bool call(std::string command, cmdmap_t& cmdmap, std::string format,
            bufferlist& out) override {
    stringstream ss;
    test_ops(service, store, command, cmdmap, ss);
    out.append(ss);
    return true;
  }
  void test_ops(OSDService *service, ObjectStore *store,
                const std::string &command, cmdmap_t& cmdmap, ostream &ss);

};

class OSD::C_Tick : public Context {
  OSD *osd;
  public:
  explicit C_Tick(OSD *o) : osd(o) {}
  void finish(int r) override {
    osd->tick();
  }
};

class OSD::C_Tick_WithoutOSDLock : public Context {
  OSD *osd;
  public:
  explicit C_Tick_WithoutOSDLock(OSD *o) : osd(o) {}
  void finish(int r) override {
    osd->tick_without_osd_lock();
  }
};

int OSD::enable_disable_fuse(bool stop)
{
#ifdef HAVE_LIBFUSE
  int r;
  string mntpath = cct->_conf->osd_data + "/fuse";
  if (fuse_store && (stop || !cct->_conf->osd_objectstore_fuse)) {
    dout(1) << __func__ << " disabling" << dendl;
    fuse_store->stop();
    delete fuse_store;
    fuse_store = NULL;
    r = ::rmdir(mntpath.c_str());
    if (r < 0)
      r = -errno;
    if (r < 0) {
      derr << __func__ << " failed to rmdir " << mntpath << dendl;
      return r;
    }
    return 0;
  }
  if (!fuse_store && cct->_conf->osd_objectstore_fuse) {
    dout(1) << __func__ << " enabling" << dendl;
    r = ::mkdir(mntpath.c_str(), 0700);
    if (r < 0)
      r = -errno;
    if (r < 0 && r != -EEXIST) {
      derr << __func__ << " unable to create " << mntpath << ": "
           << cpp_strerror(r) << dendl;
      return r;
    }
    fuse_store = new FuseStore(store, mntpath);
    r = fuse_store->start();
    if (r < 0) {
      derr << __func__ << " unable to start fuse: " << cpp_strerror(r) << dendl;
      delete fuse_store;
      fuse_store = NULL;
      return r;
    }
  }
#endif  // HAVE_LIBFUSE
  return 0;
}

int OSD::get_num_op_shards()
{
  if (cct->_conf->osd_op_num_shards)
    return cct->_conf->osd_op_num_shards;
  if (store_is_rotational)
    return cct->_conf->osd_op_num_shards_hdd;
  else
    return cct->_conf->osd_op_num_shards_ssd;
}

int OSD::get_num_op_threads()
{
  if (cct->_conf->osd_op_num_threads_per_shard)
    return get_num_op_shards() * cct->_conf->osd_op_num_threads_per_shard;
  if (store_is_rotational)
    return get_num_op_shards() * cct->_conf->osd_op_num_threads_per_shard_hdd;
  else
    return get_num_op_shards() * cct->_conf->osd_op_num_threads_per_shard_ssd;
}

int OSD::init()
{
  CompatSet initial, diff;
  Mutex::Locker lock(osd_lock);
  if (is_stopping())
    return 0;

  tick_timer.init();
  tick_timer_without_osd_lock.init();
  service.recovery_request_timer.init();
  service.recovery_sleep_timer.init();

  // mount.
  dout(2) << "init " << dev_path
          << " (looks like " << (store_is_rotational ? "hdd" : "ssd") << ")"
          << dendl;
  assert(store);  // call pre_init() first!

  store->set_cache_shards(get_num_op_shards());

  int r = store->mount();
  if (r < 0) {
    derr << "OSD:init: unable to mount object store" << dendl;
    return r;
  }

  enable_disable_fuse(false);

  dout(2) << "boot" << dendl;

  // initialize the daily loadavg with current 15min loadavg
  double loadavgs[3];
  if (getloadavg(loadavgs, 3) == 3) {
    daily_loadavg = loadavgs[2];
  } else {
    derr << "OSD::init() : couldn't read loadavgs\n" << dendl;
    daily_loadavg = 1.0;
  }

  int rotating_auth_attempts = 0;

  // sanity check long object name handling
  {
    hobject_t l;
    l.oid.name = string(cct->_conf->osd_max_object_name_len, 'n');
    l.set_key(string(cct->_conf->osd_max_object_name_len, 'k'));
    l.nspace = string(cct->_conf->osd_max_object_namespace_len, 's');
    r = store->validate_hobject_key(l);
    if (r < 0) {
      derr << "backend (" << store->get_type() << ") is unable to support max "
           << "object name[space] len" << dendl;
      derr << "   osd max object name len = "
           << cct->_conf->osd_max_object_name_len << dendl;
      derr << "   osd max object namespace len = "
           << cct->_conf->osd_max_object_namespace_len << dendl;
      derr << cpp_strerror(r) << dendl;
      if (cct->_conf->osd_check_max_object_name_len_on_startup) {
        goto out;
      }
      derr << "osd_check_max_object_name_len_on_startup = false, starting anyway"
           << dendl;
    } else {
      dout(20) << "configured osd_max_object_name[space]_len looks ok" << dendl;
    }
  }

  // read superblock
  r = read_superblock();
  if (r < 0) {
    derr << "OSD::init() : unable to read osd superblock" << dendl;
    r = -EINVAL;
    goto out;
  }

  if (osd_compat.compare(superblock.compat_features) < 0) {
    derr << "The disk uses features unsupported by the executable." << dendl;
    derr << " ondisk features " << superblock.compat_features << dendl;
    derr << " daemon features " << osd_compat << dendl;

    if (osd_compat.writeable(superblock.compat_features)) {
      CompatSet diff = osd_compat.unsupported(superblock.compat_features);
      derr << "it is still writeable, though. Missing features: " << diff << dendl;
      r = -EOPNOTSUPP;
      goto out;
    }
    else {
      CompatSet diff = osd_compat.unsupported(superblock.compat_features);
      derr << "Cannot write to disk! Missing features: " << diff << dendl;
      r = -EOPNOTSUPP;
      goto out;
    }
  }

  assert_warn(whoami == superblock.whoami);
  if (whoami != superblock.whoami) {
    derr << "OSD::init: superblock says osd"
         << superblock.whoami << " but I am osd." << whoami << dendl;
    r = -EINVAL;
    goto out;
  }

  initial = get_osd_initial_compat_set();
  diff = superblock.compat_features.unsupported(initial);
  if (superblock.compat_features.merge(initial)) {
    // We need to persist the new compat_set before we
    // do anything else
    dout(5) << "Upgrading superblock adding: " << diff << dendl;
    ObjectStore::Transaction t;
    write_superblock(t);
    r = store->apply_transaction(service.meta_osr.get(), std::move(t));
    if (r < 0)
      goto out;
  }

  // make sure snap mapper object exists
  if (!store->exists(coll_t::meta(), OSD::make_snapmapper_oid())) {
    dout(10) << "init creating/touching snapmapper object" << dendl;
    ObjectStore::Transaction t;
    t.touch(coll_t::meta(), OSD::make_snapmapper_oid());
    r = store->apply_transaction(service.meta_osr.get(), std::move(t));
    if (r < 0)
      goto out;
  }

  class_handler = new ClassHandler(cct);
  cls_initialize(class_handler);

  if (cct->_conf->osd_open_classes_on_start) {
    int r = class_handler->open_all_classes();
    if (r)
      dout(1) << "warning: got an error loading one or more classes: " << cpp_strerror(r) << dendl;
  }

  // load up "current" osdmap
  assert_warn(!osdmap);
  if (osdmap) {
    derr << "OSD::init: unable to read current osdmap" << dendl;
    r = -EINVAL;
    goto out;
  }
  osdmap = get_map(superblock.current_epoch);
  check_osdmap_features(store);

  create_recoverystate_perf();

  {
    epoch_t bind_epoch = osdmap->get_epoch();
    service.set_epochs(NULL, NULL, &bind_epoch);
  }

  clear_temp_objects();

  // load up pgs (as they previously existed)
  load_pgs();

  dout(2) << "superblock: I am osd." << superblock.whoami << dendl;
  dout(0) << "using " << op_queue << " op queue with priority op cut off at " <<
    op_prio_cutoff << "." << dendl;

  create_logger();

  // i'm ready!
  client_messenger->add_dispatcher_head(this);
  cluster_messenger->add_dispatcher_head(this);

  hb_front_client_messenger->add_dispatcher_head(&heartbeat_dispatcher);
  hb_back_client_messenger->add_dispatcher_head(&heartbeat_dispatcher);
  hb_front_server_messenger->add_dispatcher_head(&heartbeat_dispatcher);
  hb_back_server_messenger->add_dispatcher_head(&heartbeat_dispatcher);

  objecter_messenger->add_dispatcher_head(service.objecter);

  monc->set_want_keys(CEPH_ENTITY_TYPE_MON | CEPH_ENTITY_TYPE_OSD
                      | CEPH_ENTITY_TYPE_MGR);
  r = monc->init();
  if (r < 0)
    goto out;

  /**
   * FIXME: this is a placeholder implementation that unconditionally
   * sends every is_primary PG's stats every time we're called, unlike
   * the existing mon PGStats mechanism that uses pg_stat_queue and acks.
   * This has equivalent cost to the existing worst case where all
   * PGs are busy and their stats are always enqueued for sending.
   */
  mgrc.set_pgstats_cb([this](){
      RWLock::RLocker l(map_lock);
      
      utime_t had_for = ceph_clock_now() - had_map_since;
      osd_stat_t cur_stat = service.get_osd_stat();
      cur_stat.os_perf_stat = store->get_cur_stats();

      MPGStats *m = new MPGStats(monc->get_fsid(), osdmap->get_epoch(), had_for);
      m->osd_stat = cur_stat;

      Mutex::Locker lec{min_last_epoch_clean_lock};
      min_last_epoch_clean = osdmap->get_epoch();
      min_last_epoch_clean_pgs.clear();
      RWLock::RLocker lpg(pg_map_lock);
      for (const auto &i : pg_map) {
        PG *pg = i.second;
        if (!pg->is_primary()) {
          continue;
        }

        pg->pg_stats_publish_lock.Lock();
        if (pg->pg_stats_publish_valid) {
          m->pg_stat[pg->info.pgid.pgid] = pg->pg_stats_publish;
          const auto lec = pg->pg_stats_publish.get_effective_last_epoch_clean();
          min_last_epoch_clean = min(min_last_epoch_clean, lec);
          min_last_epoch_clean_pgs.push_back(pg->info.pgid.pgid);
        }
        pg->pg_stats_publish_lock.Unlock();
      }

      return m;
  });

  mgrc.init();
  client_messenger->add_dispatcher_head(&mgrc);

  // tell monc about log_client so it will know about mon session resets
  monc->set_log_client(&log_client);
  update_log_config();

  peering_tp.start();
  osd_op_tp.start();
  disk_tp.start();
  command_tp.start();

  set_disk_tp_priority();

  // start the heartbeat
  heartbeat_thread.create("osd_srv_heartbt");

  // tick
  tick_timer.add_event_after(cct->_conf->osd_heartbeat_interval, new C_Tick(this));
  {
    Mutex::Locker l(tick_timer_lock);
    tick_timer_without_osd_lock.add_event_after(cct->_conf->osd_heartbeat_interval, new C_Tick_WithoutOSDLock(this));
  }

  service.init();
  service.publish_map(osdmap);
  service.publish_superblock(superblock);
  service.max_oldest_map = superblock.oldest_map;

  osd_lock.Unlock();

  r = monc->authenticate();
  if (r < 0) {
    osd_lock.Lock(); // locker is going to unlock this on function exit
    if (is_stopping())
      r =  0;
    goto monout;
  }

  while (monc->wait_auth_rotating(30.0) < 0) {
    derr << "unable to obtain rotating service keys; retrying" << dendl;
    ++rotating_auth_attempts;
    if (rotating_auth_attempts > g_conf->max_rotating_auth_attempts) {
        osd_lock.Lock(); // make locker happy
        if (!is_stopping()) {
            r = - ETIMEDOUT;
        }
        goto monout;
    }
  }

  r = update_crush_device_class();
  if (r < 0) {
    osd_lock.Lock();
    goto monout;
  }

  r = update_crush_location();
  if (r < 0) {
    osd_lock.Lock();
    goto monout;
  }

  osd_lock.Lock();
  if (is_stopping())
    return 0;

  // start objecter *after* we have authenticated, so that we don't ignore
  // the OSDMaps it requests.
  service.final_init();

  check_config();

  dout(10) << "ensuring pgs have consumed prior maps" << dendl;
  consume_map();
  peering_wq.drain();

  dout(0) << "done with init, starting boot process" << dendl;

  // subscribe to any pg creations
  monc->sub_want("osd_pg_creates", last_pg_create_epoch, 0);

  // MgrClient needs this (it doesn't have MonClient reference itself)
  monc->sub_want("mgrmap", 0, 0);

  // we don't need to ask for an osdmap here; objecter will
  //monc->sub_want("osdmap", osdmap->get_epoch(), CEPH_SUBSCRIBE_ONETIME);

  monc->renew_subs();

  start_boot();

  return 0;
monout:
  mgrc.shutdown();
  monc->shutdown();

out:
  enable_disable_fuse(true);
  store->umount();
  delete store;
  store = NULL;
  return r;
}

void OSD::final_init()
{
  AdminSocket *admin_socket = cct->get_admin_socket();
  asok_hook = new OSDSocketHook(this);
  int r = admin_socket->register_command("status", "status", asok_hook,
                                         "high-level status of OSD");
  assert(r == 0);
  r = admin_socket->register_command("flush_journal", "flush_journal",
                                     asok_hook,
                                     "flush the journal to permanent store");
  assert(r == 0);
  r = admin_socket->register_command("dump_ops_in_flight",
                                     "dump_ops_in_flight", asok_hook,
                                     "show the ops currently in flight");
  assert(r == 0);
  r = admin_socket->register_command("ops",
                                     "ops", asok_hook,
                                     "show the ops currently in flight");
  assert(r == 0);
  r = admin_socket->register_command("dump_blocked_ops",
                                     "dump_blocked_ops", asok_hook,
                                     "show the blocked ops currently in flight");
  assert(r == 0);
  r = admin_socket->register_command("dump_historic_ops", "dump_historic_ops",
                                     asok_hook,
                                     "show recent ops");
  assert(r == 0);
  r = admin_socket->register_command("dump_historic_slow_ops", "dump_historic_slow_ops",
                                     asok_hook,
                                     "show slowest recent ops");
  assert(r == 0);
  r = admin_socket->register_command("dump_historic_ops_by_duration", "dump_historic_ops_by_duration",
                                     asok_hook,
                                     "show slowest recent ops, sorted by duration");
  assert(r == 0);
  r = admin_socket->register_command("dump_op_pq_state", "dump_op_pq_state",
                                     asok_hook,
                                     "dump op priority queue state");
  assert(r == 0);
  r = admin_socket->register_command("dump_blacklist", "dump_blacklist",
                                     asok_hook,
                                     "dump blacklisted clients and times");
  assert(r == 0);
  r = admin_socket->register_command("dump_watchers", "dump_watchers",
                                     asok_hook,
                                     "show clients which have active watches,"
                                     " and on which objects");
  assert(r == 0);
  r = admin_socket->register_command("dump_reservations", "dump_reservations",
                                     asok_hook,
                                     "show recovery reservations");
  assert(r == 0);
  r = admin_socket->register_command("get_latest_osdmap", "get_latest_osdmap",
                                     asok_hook,
                                     "force osd to update the latest map from "
                                     "the mon");
  assert(r == 0);

  r = admin_socket->register_command( "heap",
                                      "heap " \
                                      "name=heapcmd,type=CephString",
                                      asok_hook,
                                      "show heap usage info (available only if "
                                      "compiled with tcmalloc)");
  assert(r == 0);

  r = admin_socket->register_command("set_heap_property",
                                     "set_heap_property " \
                                     "name=property,type=CephString " \
                                     "name=value,type=CephInt",
                                     asok_hook,
                                     "update malloc extension heap property");
  assert(r == 0);

  r = admin_socket->register_command("get_heap_property",
                                     "get_heap_property " \
                                     "name=property,type=CephString",
                                     asok_hook,
                                     "get malloc extension heap property");
  assert(r == 0);

  r = admin_socket->register_command("dump_objectstore_kv_stats",
                                     "dump_objectstore_kv_stats",
                                     asok_hook,
                                     "print statistics of kvdb which used by bluestore");
  assert(r == 0);

  r = admin_socket->register_command("dump_scrubs",
                                     "dump_scrubs",
                                     asok_hook,
                                     "print scheduled scrubs");
  assert(r == 0);

  r = admin_socket->register_command("calc_objectstore_db_histogram",
                                     "calc_objectstore_db_histogram",
                                     asok_hook,
                                     "Generate key value histogram of kvdb(rocksdb) which used by bluestore");
  assert(r == 0);

  r = admin_socket->register_command("flush_store_cache",
                                     "flush_store_cache",
                                     asok_hook,
                                     "Flush bluestore internal cache");
  assert(r == 0);
  r = admin_socket->register_command("dump_pgstate_history", "dump_pgstate_history",
                                     asok_hook,
                                     "show recent state history");
  assert(r == 0);

  r = admin_socket->register_command("compact", "compact",
                                     asok_hook,
                                     "Commpact object store's omap."
                                     " WARNING: Compaction probably slows your requests");
  assert(r == 0);

  test_ops_hook = new TestOpsSocketHook(&(this->service), this->store);
  // Note: pools are CephString instead of CephPoolname because
  // these commands traditionally support both pool names and numbers
  r = admin_socket->register_command(
   "setomapval",
   "setomapval " \
   "name=pool,type=CephString " \
   "name=objname,type=CephObjectname " \
   "name=key,type=CephString "\
   "name=val,type=CephString",
   test_ops_hook,
   "set omap key");
  assert(r == 0);
  r = admin_socket->register_command(
    "rmomapkey",
    "rmomapkey " \
    "name=pool,type=CephString " \
    "name=objname,type=CephObjectname " \
    "name=key,type=CephString",
    test_ops_hook,
    "remove omap key");
  assert(r == 0);
  r = admin_socket->register_command(
    "setomapheader",
    "setomapheader " \
    "name=pool,type=CephString " \
    "name=objname,type=CephObjectname " \
    "name=header,type=CephString",
    test_ops_hook,
    "set omap header");
  assert(r == 0);

  r = admin_socket->register_command(
    "getomap",
    "getomap " \
    "name=pool,type=CephString " \
    "name=objname,type=CephObjectname",
    test_ops_hook,
    "output entire object map");
  assert(r == 0);

  r = admin_socket->register_command(
    "truncobj",
    "truncobj " \
    "name=pool,type=CephString " \
    "name=objname,type=CephObjectname " \
    "name=len,type=CephInt",
    test_ops_hook,
    "truncate object to length");
  assert(r == 0);

  r = admin_socket->register_command(
    "injectdataerr",
    "injectdataerr " \
    "name=pool,type=CephString " \
    "name=objname,type=CephObjectname " \
    "name=shardid,type=CephInt,req=false,range=0|255",
    test_ops_hook,
    "inject data error to an object");
  assert(r == 0);

  r = admin_socket->register_command(
    "injectmdataerr",
    "injectmdataerr " \
    "name=pool,type=CephString " \
    "name=objname,type=CephObjectname " \
    "name=shardid,type=CephInt,req=false,range=0|255",
    test_ops_hook,
    "inject metadata error to an object");
  assert(r == 0);
  r = admin_socket->register_command(
    "set_recovery_delay",
    "set_recovery_delay " \
    "name=utime,type=CephInt,req=false",
    test_ops_hook,
     "Delay osd recovery by specified seconds");
  assert(r == 0);
  r = admin_socket->register_command(
   "trigger_scrub",
   "trigger_scrub " \
   "name=pgid,type=CephString ",
   test_ops_hook,
   "Trigger a scheduled scrub ");
  assert(r == 0);
  r = admin_socket->register_command(
   "injectfull",
   "injectfull " \
   "name=type,type=CephString,req=false " \
   "name=count,type=CephInt,req=false ",
   test_ops_hook,
   "Inject a full disk (optional count times)");
  assert(r == 0);
}

void OSD::create_logger()
{
  dout(10) << "create_logger" << dendl;

  PerfCountersBuilder osd_plb(cct, "osd", l_osd_first, l_osd_last);

  // Latency axis configuration for op histograms, values are in nanoseconds
  PerfHistogramCommon::axis_config_d op_hist_x_axis_config{
    "Latency (usec)",
    PerfHistogramCommon::SCALE_LOG2, ///< Latency in logarithmic scale
    0,                               ///< Start at 0
    100000,                          ///< Quantization unit is 100usec
    32,                              ///< Enough to cover much longer than slow requests
  };

  // Op size axis configuration for op histograms, values are in bytes
  PerfHistogramCommon::axis_config_d op_hist_y_axis_config{
    "Request size (bytes)",
    PerfHistogramCommon::SCALE_LOG2, ///< Request size in logarithmic scale
    0,                               ///< Start at 0
    512,                             ///< Quantization unit is 512 bytes
    32,                              ///< Enough to cover requests larger than GB
  };


  osd_plb.add_u64(
    l_osd_op_wip, "op_wip",
    "Replication operations currently being processed (primary)");
  osd_plb.add_u64_counter(
    l_osd_op, "op",
    "Client operations",
    "ops", PerfCountersBuilder::PRIO_CRITICAL);
  osd_plb.add_u64_counter(
    l_osd_op_inb,   "op_in_bytes",
    "Client operations total write size",
    "wr", PerfCountersBuilder::PRIO_INTERESTING);
  osd_plb.add_u64_counter(
    l_osd_op_outb,  "op_out_bytes",
    "Client operations total read size",
    "rd", PerfCountersBuilder::PRIO_INTERESTING);
  osd_plb.add_time_avg(
    l_osd_op_lat,   "op_latency",
    "Latency of client operations (including queue time)",
    "l", 9);
  osd_plb.add_time_avg(
    l_osd_op_process_lat, "op_process_latency",
    "Latency of client operations (excluding queue time)");
  osd_plb.add_time_avg(
    l_osd_op_prepare_lat, "op_prepare_latency",
    "Latency of client operations (excluding queue time and wait for finished)");

  osd_plb.add_u64_counter(
    l_osd_op_r, "op_r", "Client read operations");
  osd_plb.add_u64_counter(
    l_osd_op_r_outb, "op_r_out_bytes", "Client data read");
  osd_plb.add_time_avg(
    l_osd_op_r_lat, "op_r_latency",
    "Latency of read operation (including queue time)");
  osd_plb.add_u64_counter_histogram(
    l_osd_op_r_lat_outb_hist, "op_r_latency_out_bytes_histogram",
    op_hist_x_axis_config, op_hist_y_axis_config,
    "Histogram of operation latency (including queue time) + data read");
  osd_plb.add_time_avg(
    l_osd_op_r_process_lat, "op_r_process_latency",
    "Latency of read operation (excluding queue time)");
  osd_plb.add_time_avg(
    l_osd_op_r_prepare_lat, "op_r_prepare_latency",
    "Latency of read operations (excluding queue time and wait for finished)");
  osd_plb.add_u64_counter(
    l_osd_op_w, "op_w", "Client write operations");
  osd_plb.add_u64_counter(
    l_osd_op_w_inb, "op_w_in_bytes", "Client data written");
  osd_plb.add_time_avg(
    l_osd_op_w_lat,  "op_w_latency",
    "Latency of write operation (including queue time)");
  osd_plb.add_u64_counter_histogram(
    l_osd_op_w_lat_inb_hist, "op_w_latency_in_bytes_histogram",
    op_hist_x_axis_config, op_hist_y_axis_config,
    "Histogram of operation latency (including queue time) + data written");
  osd_plb.add_time_avg(
    l_osd_op_w_process_lat, "op_w_process_latency",
    "Latency of write operation (excluding queue time)");
  osd_plb.add_time_avg(
    l_osd_op_w_prepare_lat, "op_w_prepare_latency",
    "Latency of write operations (excluding queue time and wait for finished)");
  osd_plb.add_u64_counter(
    l_osd_op_rw, "op_rw",
    "Client read-modify-write operations");
  osd_plb.add_u64_counter(
    l_osd_op_rw_inb, "op_rw_in_bytes",
    "Client read-modify-write operations write in");
  osd_plb.add_u64_counter(
    l_osd_op_rw_outb,"op_rw_out_bytes",
    "Client read-modify-write operations read out ");
  osd_plb.add_time_avg(
    l_osd_op_rw_lat, "op_rw_latency",
    "Latency of read-modify-write operation (including queue time)");
  osd_plb.add_u64_counter_histogram(
    l_osd_op_rw_lat_inb_hist, "op_rw_latency_in_bytes_histogram",
    op_hist_x_axis_config, op_hist_y_axis_config,
    "Histogram of rw operation latency (including queue time) + data written");
  osd_plb.add_u64_counter_histogram(
    l_osd_op_rw_lat_outb_hist, "op_rw_latency_out_bytes_histogram",
    op_hist_x_axis_config, op_hist_y_axis_config,
    "Histogram of rw operation latency (including queue time) + data read");
  osd_plb.add_time_avg(
    l_osd_op_rw_process_lat, "op_rw_process_latency",
    "Latency of read-modify-write operation (excluding queue time)");
  osd_plb.add_time_avg(
    l_osd_op_rw_prepare_lat, "op_rw_prepare_latency",
    "Latency of read-modify-write operations (excluding queue time and wait for finished)");

  osd_plb.add_time_avg(l_osd_op_before_queue_op_lat, "op_before_queue_op_lat",
    "Latency of IO before calling queue(before really queue into ShardedOpWq)"); // client io before queue op_wq latency
  osd_plb.add_time_avg(l_osd_op_before_dequeue_op_lat, "op_before_dequeue_op_lat",
    "Latency of IO before calling dequeue_op(already dequeued and get PG lock)"); // client io before dequeue_op latency

  osd_plb.add_u64_counter(
    l_osd_sop, "subop", "Suboperations");
  osd_plb.add_u64_counter(
    l_osd_sop_inb, "subop_in_bytes", "Suboperations total size");
  osd_plb.add_time_avg(l_osd_sop_lat, "subop_latency", "Suboperations latency");

  osd_plb.add_u64_counter(l_osd_sop_w, "subop_w", "Replicated writes");
  osd_plb.add_u64_counter(
    l_osd_sop_w_inb, "subop_w_in_bytes", "Replicated written data size");
  osd_plb.add_time_avg(
    l_osd_sop_w_lat, "subop_w_latency", "Replicated writes latency");
  osd_plb.add_u64_counter(
    l_osd_sop_pull, "subop_pull", "Suboperations pull requests");
  osd_plb.add_time_avg(
    l_osd_sop_pull_lat, "subop_pull_latency", "Suboperations pull latency");
  osd_plb.add_u64_counter(
    l_osd_sop_push, "subop_push", "Suboperations push messages");
  osd_plb.add_u64_counter(
    l_osd_sop_push_inb, "subop_push_in_bytes", "Suboperations pushed size");
  osd_plb.add_time_avg(
    l_osd_sop_push_lat, "subop_push_latency", "Suboperations push latency");

  osd_plb.add_u64_counter(l_osd_pull, "pull", "Pull requests sent");
  osd_plb.add_u64_counter(l_osd_push, "push", "Push messages sent");
  osd_plb.add_u64_counter(l_osd_push_outb, "push_out_bytes", "Pushed size");

  osd_plb.add_u64_counter(
    l_osd_rop, "recovery_ops",
    "Started recovery operations",
    "rop", PerfCountersBuilder::PRIO_INTERESTING);

  osd_plb.add_u64(l_osd_loadavg, "loadavg", "CPU load");
  osd_plb.add_u64(l_osd_buf, "buffer_bytes", "Total allocated buffer size");
  osd_plb.add_u64(l_osd_history_alloc_bytes, "history_alloc_Mbytes");
  osd_plb.add_u64(l_osd_history_alloc_num, "history_alloc_num");
  osd_plb.add_u64(
    l_osd_cached_crc, "cached_crc", "Total number getting crc from crc_cache");
  osd_plb.add_u64(
    l_osd_cached_crc_adjusted, "cached_crc_adjusted",
    "Total number getting crc from crc_cache with adjusting");
  osd_plb.add_u64(l_osd_missed_crc, "missed_crc", 
    "Total number of crc cache misses");

  osd_plb.add_u64(l_osd_pg, "numpg", "Placement groups",
                  "pgs", PerfCountersBuilder::PRIO_USEFUL);
  osd_plb.add_u64(
    l_osd_pg_primary, "numpg_primary",
    "Placement groups for which this osd is primary");
  osd_plb.add_u64(
    l_osd_pg_replica, "numpg_replica",
    "Placement groups for which this osd is replica");
  osd_plb.add_u64(
    l_osd_pg_stray, "numpg_stray",
    "Placement groups ready to be deleted from this osd");
  osd_plb.add_u64(
    l_osd_hb_to, "heartbeat_to_peers", "Heartbeat (ping) peers we send to");
  osd_plb.add_u64_counter(l_osd_map, "map_messages", "OSD map messages");
  osd_plb.add_u64_counter(l_osd_mape, "map_message_epochs", "OSD map epochs");
  osd_plb.add_u64_counter(
    l_osd_mape_dup, "map_message_epoch_dups", "OSD map duplicates");
  osd_plb.add_u64_counter(
    l_osd_waiting_for_map, "messages_delayed_for_map",
    "Operations waiting for OSD map");

  osd_plb.add_u64_counter(
    l_osd_map_cache_hit, "osd_map_cache_hit", "osdmap cache hit");
  osd_plb.add_u64_counter(
    l_osd_map_cache_miss, "osd_map_cache_miss", "osdmap cache miss");
  osd_plb.add_u64_counter(
    l_osd_map_cache_miss_low, "osd_map_cache_miss_low",
    "osdmap cache miss below cache lower bound");
  osd_plb.add_u64_avg(
    l_osd_map_cache_miss_low_avg, "osd_map_cache_miss_low_avg",
    "osdmap cache miss, avg distance below cache lower bound");
  osd_plb.add_u64_counter(
    l_osd_map_bl_cache_hit, "osd_map_bl_cache_hit",
    "OSDMap buffer cache hits");
  osd_plb.add_u64_counter(
    l_osd_map_bl_cache_miss, "osd_map_bl_cache_miss",
    "OSDMap buffer cache misses");

  osd_plb.add_u64(l_osd_stat_bytes, "stat_bytes", "OSD size");
  osd_plb.add_u64(l_osd_stat_bytes_used, "stat_bytes_used", "Used space");
  osd_plb.add_u64(l_osd_stat_bytes_avail, "stat_bytes_avail", "Available space");

  osd_plb.add_u64_counter(
    l_osd_copyfrom, "copyfrom", "Rados \"copy-from\" operations");

  osd_plb.add_u64_counter(l_osd_tier_promote, "tier_promote", "Tier promotions");
  osd_plb.add_u64_counter(l_osd_tier_flush, "tier_flush", "Tier flushes");
  osd_plb.add_u64_counter(
    l_osd_tier_flush_fail, "tier_flush_fail", "Failed tier flushes");
  osd_plb.add_u64_counter(
    l_osd_tier_try_flush, "tier_try_flush", "Tier flush attempts");
  osd_plb.add_u64_counter(
    l_osd_tier_try_flush_fail, "tier_try_flush_fail",
    "Failed tier flush attempts");
  osd_plb.add_u64_counter(
    l_osd_tier_evict, "tier_evict", "Tier evictions");
  osd_plb.add_u64_counter(
    l_osd_tier_whiteout, "tier_whiteout", "Tier whiteouts");
  osd_plb.add_u64_counter(
    l_osd_tier_dirty, "tier_dirty", "Dirty tier flag set");
  osd_plb.add_u64_counter(
    l_osd_tier_clean, "tier_clean", "Dirty tier flag cleaned");
  osd_plb.add_u64_counter(
    l_osd_tier_delay, "tier_delay", "Tier delays (agent waiting)");
  osd_plb.add_u64_counter(
    l_osd_tier_proxy_read, "tier_proxy_read", "Tier proxy reads");
  osd_plb.add_u64_counter(
    l_osd_tier_proxy_write, "tier_proxy_write", "Tier proxy writes");

  osd_plb.add_u64_counter(
    l_osd_agent_wake, "agent_wake", "Tiering agent wake up");
  osd_plb.add_u64_counter(
    l_osd_agent_skip, "agent_skip", "Objects skipped by agent");
  osd_plb.add_u64_counter(
    l_osd_agent_flush, "agent_flush", "Tiering agent flushes");
  osd_plb.add_u64_counter(
    l_osd_agent_evict, "agent_evict", "Tiering agent evictions");

  osd_plb.add_u64_counter(
    l_osd_object_ctx_cache_hit, "object_ctx_cache_hit", "Object context cache hits");
  osd_plb.add_u64_counter(
    l_osd_object_ctx_cache_total, "object_ctx_cache_total", "Object context cache lookups");

  osd_plb.add_u64_counter(l_osd_op_cache_hit, "op_cache_hit");
  osd_plb.add_time_avg(
    l_osd_tier_flush_lat, "osd_tier_flush_lat", "Object flush latency");
  osd_plb.add_time_avg(
    l_osd_tier_promote_lat, "osd_tier_promote_lat", "Object promote latency");
  osd_plb.add_time_avg(
    l_osd_tier_r_lat, "osd_tier_r_lat", "Object proxy read latency");

  osd_plb.add_u64_counter(
    l_osd_pg_info, "osd_pg_info", "PG updated its info (using any method)");
  osd_plb.add_u64_counter(
    l_osd_pg_fastinfo, "osd_pg_fastinfo",
    "PG updated its info using fastinfo attr");
  osd_plb.add_u64_counter(
    l_osd_pg_biginfo, "osd_pg_biginfo", "PG updated its biginfo attr");

  logger = osd_plb.create_perf_counters();
  cct->get_perfcounters_collection()->add(logger);
}

void OSD::create_recoverystate_perf()
{
  dout(10) << "create_recoverystate_perf" << dendl;

  PerfCountersBuilder rs_perf(cct, "recoverystate_perf", rs_first, rs_last);

  rs_perf.add_time_avg(rs_initial_latency, "initial_latency", "Initial recovery state latency");
  rs_perf.add_time_avg(rs_started_latency, "started_latency", "Started recovery state latency");
  rs_perf.add_time_avg(rs_reset_latency, "reset_latency", "Reset recovery state latency");
  rs_perf.add_time_avg(rs_start_latency, "start_latency", "Start recovery state latency");
  rs_perf.add_time_avg(rs_primary_latency, "primary_latency", "Primary recovery state latency");
  rs_perf.add_time_avg(rs_peering_latency, "peering_latency", "Peering recovery state latency");
  rs_perf.add_time_avg(rs_backfilling_latency, "backfilling_latency", "Backfilling recovery state latency");
  rs_perf.add_time_avg(rs_waitremotebackfillreserved_latency, "waitremotebackfillreserved_latency", "Wait remote backfill reserved recovery state latency");
  rs_perf.add_time_avg(rs_waitlocalbackfillreserved_latency, "waitlocalbackfillreserved_latency", "Wait local backfill reserved recovery state latency");
  rs_perf.add_time_avg(rs_notbackfilling_latency, "notbackfilling_latency", "Notbackfilling recovery state latency");
  rs_perf.add_time_avg(rs_repnotrecovering_latency, "repnotrecovering_latency", "Repnotrecovering recovery state latency");
  rs_perf.add_time_avg(rs_repwaitrecoveryreserved_latency, "repwaitrecoveryreserved_latency", "Rep wait recovery reserved recovery state latency");
  rs_perf.add_time_avg(rs_repwaitbackfillreserved_latency, "repwaitbackfillreserved_latency", "Rep wait backfill reserved recovery state latency");
  rs_perf.add_time_avg(rs_reprecovering_latency, "reprecovering_latency", "RepRecovering recovery state latency");
  rs_perf.add_time_avg(rs_activating_latency, "activating_latency", "Activating recovery state latency");
  rs_perf.add_time_avg(rs_waitlocalrecoveryreserved_latency, "waitlocalrecoveryreserved_latency", "Wait local recovery reserved recovery state latency");
  rs_perf.add_time_avg(rs_waitremoterecoveryreserved_latency, "waitremoterecoveryreserved_latency", "Wait remote recovery reserved recovery state latency");
  rs_perf.add_time_avg(rs_recovering_latency, "recovering_latency", "Recovering recovery state latency");
  rs_perf.add_time_avg(rs_recovered_latency, "recovered_latency", "Recovered recovery state latency");
  rs_perf.add_time_avg(rs_clean_latency, "clean_latency", "Clean recovery state latency");
  rs_perf.add_time_avg(rs_active_latency, "active_latency", "Active recovery state latency");
  rs_perf.add_time_avg(rs_replicaactive_latency, "replicaactive_latency", "Replicaactive recovery state latency");
  rs_perf.add_time_avg(rs_stray_latency, "stray_latency", "Stray recovery state latency");
  rs_perf.add_time_avg(rs_getinfo_latency, "getinfo_latency", "Getinfo recovery state latency");
  rs_perf.add_time_avg(rs_getlog_latency, "getlog_latency", "Getlog recovery state latency");
  rs_perf.add_time_avg(rs_waitactingchange_latency, "waitactingchange_latency", "Waitactingchange recovery state latency");
  rs_perf.add_time_avg(rs_incomplete_latency, "incomplete_latency", "Incomplete recovery state latency");
  rs_perf.add_time_avg(rs_down_latency, "down_latency", "Down recovery state latency");
  rs_perf.add_time_avg(rs_getmissing_latency, "getmissing_latency", "Getmissing recovery state latency");
  rs_perf.add_time_avg(rs_waitupthru_latency, "waitupthru_latency", "Waitupthru recovery state latency");
  rs_perf.add_time_avg(rs_notrecovering_latency, "notrecovering_latency", "Notrecovering recovery state latency");

  recoverystate_perf = rs_perf.create_perf_counters();
  cct->get_perfcounters_collection()->add(recoverystate_perf);
}

int OSD::shutdown()
{
  if (!service.prepare_to_stop())
    return 0; // already shutting down
  osd_lock.Lock();
  if (is_stopping()) {
    osd_lock.Unlock();
    return 0;
  }
  derr << "shutdown" << dendl;

  set_state(STATE_STOPPING);

  // Debugging
  cct->_conf->set_val("debug_osd", "100");
  cct->_conf->set_val("debug_journal", "100");
  cct->_conf->set_val("debug_filestore", "100");
  cct->_conf->set_val("debug_ms", "100");
  cct->_conf->apply_changes(NULL);

  // stop MgrClient earlier as it's more like an internal consumer of OSD
  mgrc.shutdown();

  service.start_shutdown();

  // stop sending work to pgs.  this just prevents any new work in _process
  // from racing with on_shutdown and potentially entering the pg after.
  op_shardedwq.drain();

  // Shutdown PGs
  {
    RWLock::RLocker l(pg_map_lock);
    for (ceph::unordered_map<spg_t, PG*>::iterator p = pg_map.begin();
        p != pg_map.end();
        ++p) {
      dout(20) << " kicking pg " << p->first << dendl;
      p->second->lock();
      p->second->on_shutdown();
      p->second->unlock();
      p->second->osr->flush();
    }
  }
  clear_pg_stat_queue();

  // drain op queue again (in case PGs requeued something)
  op_shardedwq.drain();
  {
    finished.clear(); // zap waiters (bleh, this is messy)
  }

  op_shardedwq.clear_pg_slots();

  // unregister commands
  cct->get_admin_socket()->unregister_command("status");
  cct->get_admin_socket()->unregister_command("flush_journal");
  cct->get_admin_socket()->unregister_command("dump_ops_in_flight");
  cct->get_admin_socket()->unregister_command("ops");
  cct->get_admin_socket()->unregister_command("dump_blocked_ops");
  cct->get_admin_socket()->unregister_command("dump_historic_ops");
  cct->get_admin_socket()->unregister_command("dump_historic_ops_by_duration");
  cct->get_admin_socket()->unregister_command("dump_historic_slow_ops");
  cct->get_admin_socket()->unregister_command("dump_op_pq_state");
  cct->get_admin_socket()->unregister_command("dump_blacklist");
  cct->get_admin_socket()->unregister_command("dump_watchers");
  cct->get_admin_socket()->unregister_command("dump_reservations");
  cct->get_admin_socket()->unregister_command("get_latest_osdmap");
  cct->get_admin_socket()->unregister_command("heap");
  cct->get_admin_socket()->unregister_command("set_heap_property");
  cct->get_admin_socket()->unregister_command("get_heap_property");
  cct->get_admin_socket()->unregister_command("dump_objectstore_kv_stats");
  cct->get_admin_socket()->unregister_command("dump_scrubs");
  cct->get_admin_socket()->unregister_command("calc_objectstore_db_histogram");
  cct->get_admin_socket()->unregister_command("flush_store_cache");
  cct->get_admin_socket()->unregister_command("dump_pgstate_history");
  cct->get_admin_socket()->unregister_command("compact");
  delete asok_hook;
  asok_hook = NULL;

  cct->get_admin_socket()->unregister_command("setomapval");
  cct->get_admin_socket()->unregister_command("rmomapkey");
  cct->get_admin_socket()->unregister_command("setomapheader");
  cct->get_admin_socket()->unregister_command("getomap");
  cct->get_admin_socket()->unregister_command("truncobj");
  cct->get_admin_socket()->unregister_command("injectdataerr");
  cct->get_admin_socket()->unregister_command("injectmdataerr");
  cct->get_admin_socket()->unregister_command("set_recovery_delay");
  cct->get_admin_socket()->unregister_command("trigger_scrub");
  cct->get_admin_socket()->unregister_command("injectfull");
  delete test_ops_hook;
  test_ops_hook = NULL;

  osd_lock.Unlock();

  heartbeat_lock.Lock();
  heartbeat_stop = true;
  heartbeat_cond.Signal();
  heartbeat_lock.Unlock();
  heartbeat_thread.join();

  peering_tp.drain();
  peering_wq.clear();
  peering_tp.stop();
  dout(10) << "osd tp stopped" << dendl;

  osd_op_tp.drain();
  osd_op_tp.stop();
  dout(10) << "op sharded tp stopped" << dendl;

  command_tp.drain();
  command_tp.stop();
  dout(10) << "command tp stopped" << dendl;

  disk_tp.drain();
  disk_tp.stop();
  dout(10) << "disk tp paused (new)" << dendl;

  dout(10) << "stopping agent" << dendl;
  service.agent_stop();

  osd_lock.Lock();

  reset_heartbeat_peers();

  tick_timer.shutdown();

  {
    Mutex::Locker l(tick_timer_lock);
    tick_timer_without_osd_lock.shutdown();
  }

  // note unmount epoch
  dout(10) << "noting clean unmount in epoch " << osdmap->get_epoch() << dendl;
  superblock.mounted = service.get_boot_epoch();
  superblock.clean_thru = osdmap->get_epoch();
  ObjectStore::Transaction t;
  write_superblock(t);
  int r = store->apply_transaction(service.meta_osr.get(), std::move(t));
  if (r) {
    derr << "OSD::shutdown: error writing superblock: "
         << cpp_strerror(r) << dendl;
  }


  {
    Mutex::Locker l(pg_stat_queue_lock);
    assert(pg_stat_queue.empty());
  }

  service.shutdown_reserver();

  // Remove PGs
#ifdef PG_DEBUG_REFS
  service.dump_live_pgids();
#endif
  {
    RWLock::RLocker l(pg_map_lock);
    for (ceph::unordered_map<spg_t, PG*>::iterator p = pg_map.begin();
        p != pg_map.end();
        ++p) {
      dout(20) << " kicking pg " << p->first << dendl;
      p->second->lock();
      if (p->second->ref != 1) {
        derr << "pgid " << p->first << " has ref count of "
            << p->second->ref << dendl;
#ifdef PG_DEBUG_REFS
        p->second->dump_live_ids();
#endif
        if (cct->_conf->osd_shutdown_pgref_assert) {
          ceph_abort();
        }
      }
      p->second->unlock();
      p->second->put("PGMap");
    }
    pg_map.clear();
  }
#ifdef PG_DEBUG_REFS
  service.dump_live_pgids();
#endif
  cct->_conf->remove_observer(this);

  dout(10) << "syncing store" << dendl;
  enable_disable_fuse(true);

  if (cct->_conf->osd_journal_flush_on_shutdown) {
    dout(10) << "flushing journal" << dendl;
    store->flush_journal();
  }

  store->umount();
  delete store;
  store = 0;
  dout(10) << "Store synced" << dendl;

  monc->shutdown();
  osd_lock.Unlock();

  osdmap = OSDMapRef();
  service.shutdown();
  op_tracker.on_shutdown();

  class_handler->shutdown();
  client_messenger->shutdown();
  cluster_messenger->shutdown();
  hb_front_client_messenger->shutdown();
  hb_back_client_messenger->shutdown();
  objecter_messenger->shutdown();
  hb_front_server_messenger->shutdown();
  hb_back_server_messenger->shutdown();

  peering_wq.clear();

  return r;
}

int OSD::mon_cmd_maybe_osd_create(string &cmd)
{
  bool created = false;
  while (true) {
    dout(10) << __func__ << " cmd: " << cmd << dendl;
    vector<string> vcmd{cmd};
    bufferlist inbl;
    C_SaferCond w;
    string outs;
    monc->start_mon_command(vcmd, inbl, NULL, &outs, &w);
    int r = w.wait();
    if (r < 0) {
      if (r == -ENOENT && !created) {
        string newcmd = "{\"prefix\": \"osd create\", \"id\": " + stringify(whoami)
          + ", \"uuid\": \"" + stringify(superblock.osd_fsid) + "\"}";
        vector<string> vnewcmd{newcmd};
        bufferlist inbl;
        C_SaferCond w;
        string outs;
        monc->start_mon_command(vnewcmd, inbl, NULL, &outs, &w);
        int r = w.wait();
        if (r < 0) {
          derr << __func__ << " fail: osd does not exist and created failed: "
               << cpp_strerror(r) << dendl;
          return r;
        }
        created = true;
        continue;
      }
      derr << __func__ << " fail: '" << outs << "': " << cpp_strerror(r) << dendl;
      return r;
    }
    break;
  }

  return 0;
}

int OSD::update_crush_location()
{
  if (!cct->_conf->osd_crush_update_on_start) {
    dout(10) << __func__ << " osd_crush_update_on_start = false" << dendl;
    return 0;
  }

  char weight[32];
  if (cct->_conf->osd_crush_initial_weight >= 0) {
    snprintf(weight, sizeof(weight), "%.4lf", cct->_conf->osd_crush_initial_weight);
  } else {
    struct store_statfs_t st;
    int r = store->statfs(&st);
    if (r < 0) {
      derr << "statfs: " << cpp_strerror(r) << dendl;
      return r;
    }
    snprintf(weight, sizeof(weight), "%.4lf",
             MAX((double).00001,
                 (double)(st.total) /
                 (double)(1ull << 40 /* TB */)));
  }

  std::multimap<string,string> loc = cct->crush_location.get_location();
  dout(10) << __func__ << " crush location is " << loc << dendl;

  string cmd =
    string("{\"prefix\": \"osd crush create-or-move\", ") +
    string("\"id\": ") + stringify(whoami) + string(", ") +
    string("\"weight\":") + weight + string(", ") +
    string("\"args\": [");
  for (multimap<string,string>::iterator p = loc.begin(); p != loc.end(); ++p) {
    if (p != loc.begin())
      cmd += ", ";
    cmd += "\"" + p->first + "=" + p->second + "\"";
  }
  cmd += "]}";

  return mon_cmd_maybe_osd_create(cmd);
}

int OSD::update_crush_device_class()
{
  if (!cct->_conf->osd_class_update_on_start) {
    dout(10) << __func__ << " osd_class_update_on_start = false" << dendl;
    return 0;
  }

  string device_class;
  int r = store->read_meta("crush_device_class", &device_class);
  if (r < 0 || device_class.empty()) {
    device_class = store->get_default_device_class();
  }

  if (device_class.empty()) {
    return 0;
  }

  string cmd =
    string("{\"prefix\": \"osd crush set-device-class\", ") +
    string("\"class\": \"") + device_class + string("\", ") +
    string("\"ids\": [\"") + stringify(whoami) + string("\"]}");

  r = mon_cmd_maybe_osd_create(cmd);
  if (r == -EPERM) {
    r = 0;
  }

  return r;
}

void OSD::write_superblock(ObjectStore::Transaction& t)
{
  dout(10) << "write_superblock " << superblock << dendl;

  //hack: at minimum it's using the baseline feature set
  if (!superblock.compat_features.incompat.contains(CEPH_OSD_FEATURE_INCOMPAT_BASE))
    superblock.compat_features.incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_BASE);

  bufferlist bl;
  ::encode(superblock, bl);
  t.write(coll_t::meta(), OSD_SUPERBLOCK_GOBJECT, 0, bl.length(), bl);
}

int OSD::read_superblock()
{
  bufferlist bl;
  int r = store->read(coll_t::meta(), OSD_SUPERBLOCK_GOBJECT, 0, 0, bl);
  if (r < 0)
    return r;

  bufferlist::iterator p = bl.begin();
  ::decode(superblock, p);

  dout(10) << "read_superblock " << superblock << dendl;

  return 0;
}

void OSD::clear_temp_objects()
{
  dout(10) << __func__ << dendl;
  vector<coll_t> ls;
  store->list_collections(ls);
  for (vector<coll_t>::iterator p = ls.begin(); p != ls.end(); ++p) {
    spg_t pgid;
    if (!p->is_pg(&pgid))
      continue;

    // list temp objects
    dout(20) << " clearing temps in " << *p << " pgid " << pgid << dendl;

    vector<ghobject_t> temps;
    ghobject_t next;
    while (1) {
      vector<ghobject_t> objects;
      store->collection_list(*p, next, ghobject_t::get_max(),
                             store->get_ideal_list_max(),
                             &objects, &next);
      if (objects.empty())
        break;
      vector<ghobject_t>::iterator q;
      for (q = objects.begin(); q != objects.end(); ++q) {
        // Hammer set pool for temps to -1, so check for clean-up
        if (q->hobj.is_temp() || (q->hobj.pool == -1)) {
          temps.push_back(*q);
        } else {
          break;
        }
      }
      // If we saw a non-temp object and hit the break above we can
      // break out of the while loop too.
      if (q != objects.end())
        break;
    }
    if (!temps.empty()) {
      ObjectStore::Transaction t;
      int removed = 0;
      for (vector<ghobject_t>::iterator q = temps.begin(); q != temps.end(); ++q) {
        dout(20) << "  removing " << *p << " object " << *q << dendl;
        t.remove(*p, *q);
        if (++removed > cct->_conf->osd_target_transaction_size) {
          store->apply_transaction(service.meta_osr.get(), std::move(t));
          t = ObjectStore::Transaction();
          removed = 0;
        }
      }
      if (removed) {
        store->apply_transaction(service.meta_osr.get(), std::move(t));
      }
    }
  }
}

void OSD::recursive_remove_collection(CephContext* cct,
                                      ObjectStore *store, spg_t pgid,
                                      coll_t tmp)
{
  OSDriver driver(
    store,
    coll_t(),
    make_snapmapper_oid());

  ceph::shared_ptr<ObjectStore::Sequencer> osr (std::make_shared<
                                      ObjectStore::Sequencer>("rm"));
  ObjectStore::Transaction t;
  SnapMapper mapper(cct, &driver, 0, 0, 0, pgid.shard);

  vector<ghobject_t> objects;
  store->collection_list(tmp, ghobject_t(), ghobject_t::get_max(),
                         INT_MAX, &objects, 0);
  generic_dout(10) << __func__ << " " << objects << dendl;
  // delete them.
  int removed = 0;
  for (vector<ghobject_t>::iterator p = objects.begin();
       p != objects.end();
       ++p, removed++) {
    OSDriver::OSTransaction _t(driver.get_transaction(&t));
    int r = mapper.remove_oid(p->hobj, &_t);
    if (r != 0 && r != -ENOENT)
      ceph_abort();
    t.remove(tmp, *p);
    if (removed > cct->_conf->osd_target_transaction_size) {
      int r = store->apply_transaction(osr.get(), std::move(t));
      assert(r == 0);
      t = ObjectStore::Transaction();
      removed = 0;
    }
  }
  t.remove_collection(tmp);
  int r = store->apply_transaction(osr.get(), std::move(t));
  assert(r == 0);

  C_SaferCond waiter;
  if (!osr->flush_commit(&waiter)) {
    waiter.wait();
  }
}


// ======================================================
// PG's

PGPool OSD::_get_pool(int id, OSDMapRef createmap)
{
  if (!createmap->have_pg_pool(id)) {
    dout(5) << __func__ << ": the OSDmap does not contain a PG pool with id = "
            << id << dendl;
    ceph_abort();
  }

  PGPool p = PGPool(cct, createmap, id);

  dout(10) << "_get_pool " << p.id << dendl;
  return p;
}

PG *OSD::_open_lock_pg(
  OSDMapRef createmap,
  spg_t pgid, bool no_lockdep_check)
{
  assert(osd_lock.is_locked());

  PG* pg = _make_pg(createmap, pgid);
  {
    RWLock::WLocker l(pg_map_lock);
    pg->lock(no_lockdep_check);
    pg_map[pgid] = pg;
    pg->get("PGMap");  // because it's in pg_map
    service.pg_add_epoch(pg->info.pgid, createmap->get_epoch());
  }
  return pg;
}

PG* OSD::_make_pg(
  OSDMapRef createmap,
  spg_t pgid)
{
  dout(10) << "_open_lock_pg " << pgid << dendl;
  PGPool pool = _get_pool(pgid.pool(), createmap);

  // create
  PG *pg;
  if (createmap->get_pg_type(pgid.pgid) == pg_pool_t::TYPE_REPLICATED ||
      createmap->get_pg_type(pgid.pgid) == pg_pool_t::TYPE_ERASURE)
    pg = new PrimaryLogPG(&service, createmap, pool, pgid);
  else
    ceph_abort();

  return pg;
}


void OSD::add_newly_split_pg(PG *pg, PG::RecoveryCtx *rctx)
{
  epoch_t e(service.get_osdmap()->get_epoch());
  pg->get("PGMap");  // For pg_map
  pg_map[pg->info.pgid] = pg;
  service.pg_add_epoch(pg->info.pgid, pg->get_osdmap()->get_epoch());

  dout(10) << "Adding newly split pg " << *pg << dendl;
  pg->handle_loaded(rctx);
  pg->write_if_dirty(*(rctx->transaction));
  pg->queue_null(e, e);
  map<spg_t, list<PG::CephPeeringEvtRef> >::iterator to_wake =
    peering_wait_for_split.find(pg->info.pgid);
  if (to_wake != peering_wait_for_split.end()) {
    for (list<PG::CephPeeringEvtRef>::iterator i =
           to_wake->second.begin();
         i != to_wake->second.end();
         ++i) {
      pg->queue_peering_event(*i);
    }
    peering_wait_for_split.erase(to_wake);
  }
  if (!service.get_osdmap()->have_pg_pool(pg->info.pgid.pool()))
    _remove_pg(pg);
}

OSD::res_result OSD::_try_resurrect_pg(
  OSDMapRef curmap, spg_t pgid, spg_t *resurrected, PGRef *old_pg_state)
{
  assert(resurrected);
  assert(old_pg_state);
  // find nearest ancestor
  DeletingStateRef df;
  spg_t cur(pgid);
  while (true) {
    df = service.deleting_pgs.lookup(cur);
    if (df)
      break;
    if (!cur.ps())
      break;
    cur = cur.get_parent();
  }
  if (!df)
    return RES_NONE; // good to go

  df->old_pg_state->lock();
  OSDMapRef create_map = df->old_pg_state->get_osdmap();
  df->old_pg_state->unlock();

  set<spg_t> children;
  if (cur == pgid) {
    if (df->try_stop_deletion()) {
      dout(10) << __func__ << ": halted deletion on pg " << pgid << dendl;
      *resurrected = cur;
      *old_pg_state = df->old_pg_state;
      service.deleting_pgs.remove(pgid); // PG is no longer being removed!
      return RES_SELF;
    } else {
      // raced, ensure we don't see DeletingStateRef when we try to
      // delete this pg
      service.deleting_pgs.remove(pgid);
      return RES_NONE;
    }
  } else if (cur.is_split(create_map->get_pg_num(cur.pool()),
                          curmap->get_pg_num(cur.pool()),
                          &children) &&
             children.count(pgid)) {
    if (df->try_stop_deletion()) {
      dout(10) << __func__ << ": halted deletion on ancestor pg " << pgid
               << dendl;
      *resurrected = cur;
      *old_pg_state = df->old_pg_state;
      service.deleting_pgs.remove(cur); // PG is no longer being removed!
      return RES_PARENT;
    } else {
      /* this is not a problem, failing to cancel proves that all objects
       * have been removed, so no hobject_t overlap is possible
       */
      return RES_NONE;
    }
  }
  return RES_NONE;
}

PG *OSD::_create_lock_pg(
  OSDMapRef createmap,
  spg_t pgid,
  bool hold_map_lock,
  bool backfill,
  int role,
  vector<int>& up, int up_primary,
  vector<int>& acting, int acting_primary,
  pg_history_t history,
  const PastIntervals& pi,
  ObjectStore::Transaction& t)
{
  assert(osd_lock.is_locked());
  dout(20) << "_create_lock_pg pgid " << pgid << dendl;

  PG *pg = _open_lock_pg(createmap, pgid, true);

  service.init_splits_between(pgid, pg->get_osdmap(), service.get_osdmap());

  pg->init(
    role,
    up,
    up_primary,
    acting,
    acting_primary,
    history,
    pi,
    backfill,
    &t);

  dout(7) << "_create_lock_pg " << *pg << dendl;
  return pg;
}

PG *OSD::_lookup_lock_pg(spg_t pgid)
{
  RWLock::RLocker l(pg_map_lock);

  auto pg_map_entry = pg_map.find(pgid);
  if (pg_map_entry == pg_map.end())
    return nullptr;
  PG *pg = pg_map_entry->second;
  pg->lock();
  return pg;
}

PG *OSD::lookup_lock_pg(spg_t pgid)
{
  return _lookup_lock_pg(pgid);
}

PG *OSD::_lookup_lock_pg_with_map_lock_held(spg_t pgid)
{
  assert(pg_map.count(pgid));
  PG *pg = pg_map[pgid];
  pg->lock();
  return pg;
}

void OSD::load_pgs()
{
  assert(osd_lock.is_locked());
  dout(0) << "load_pgs" << dendl;
  {
    RWLock::RLocker l(pg_map_lock);
    assert(pg_map.empty());
  }

  vector<coll_t> ls;
  int r = store->list_collections(ls);
  if (r < 0) {
    derr << "failed to list pgs: " << cpp_strerror(-r) << dendl;
  }

  bool has_upgraded = false;

  for (vector<coll_t>::iterator it = ls.begin();
       it != ls.end();
       ++it) {
    spg_t pgid;
    if (it->is_temp(&pgid) ||
       (it->is_pg(&pgid) && PG::_has_removal_flag(store, pgid))) {
      dout(10) << "load_pgs " << *it << " clearing temp" << dendl;
      recursive_remove_collection(cct, store, pgid, *it);
      continue;
    }

    if (!it->is_pg(&pgid)) {
      dout(10) << "load_pgs ignoring unrecognized " << *it << dendl;
      continue;
    }

    if (pgid.preferred() >= 0) {
      dout(10) << __func__ << ": skipping localized PG " << pgid << dendl;
      // FIXME: delete it too, eventually
      continue;
    }

    dout(10) << "pgid " << pgid << " coll " << coll_t(pgid) << dendl;
    bufferlist bl;
    epoch_t map_epoch = 0;
    int r = PG::peek_map_epoch(store, pgid, &map_epoch, &bl);
    if (r < 0) {
      derr << __func__ << " unable to peek at " << pgid << " metadata, skipping"
           << dendl;
      continue;
    }

    PG *pg = NULL;
    if (map_epoch > 0) {
      OSDMapRef pgosdmap = service.try_get_map(map_epoch);
      if (!pgosdmap) {
        if (!osdmap->have_pg_pool(pgid.pool())) {
          derr << __func__ << ": could not find map for epoch " << map_epoch
               << " on pg " << pgid << ", but the pool is not present in the "
               << "current map, so this is probably a result of bug 10617.  "
               << "Skipping the pg for now, you can use ceph-objectstore-tool "
               << "to clean it up later." << dendl;
          continue;
        } else {
          derr << __func__ << ": have pgid " << pgid << " at epoch "
               << map_epoch << ", but missing map.  Crashing."
               << dendl;
          assert(0 == "Missing map in load_pgs");
        }
      }
      pg = _open_lock_pg(pgosdmap, pgid);
    } else {
      pg = _open_lock_pg(osdmap, pgid);
    }
    // there can be no waiters here, so we don't call wake_pg_waiters

    pg->ch = store->open_collection(pg->coll);

    // read pg state, log
    pg->read_state(store, bl);

    if (pg->must_upgrade()) {
      if (!pg->can_upgrade()) {
        derr << "PG needs upgrade, but on-disk data is too old; upgrade to"
             << " an older version first." << dendl;
        assert(0 == "PG too old to upgrade");
      }
      if (!has_upgraded) {
        derr << "PGs are upgrading" << dendl;
        has_upgraded = true;
      }
      dout(10) << "PG " << pg->info.pgid
               << " must upgrade..." << dendl;
      pg->upgrade(store);
    }

    service.init_splits_between(pg->info.pgid, pg->get_osdmap(), osdmap);

    // generate state for PG's current mapping
    int primary, up_primary;
    vector<int> acting, up;
    pg->get_osdmap()->pg_to_up_acting_osds(
      pgid.pgid, &up, &up_primary, &acting, &primary);
    pg->init_primary_up_acting(
      up,
      acting,
      up_primary,
      primary);
    int role = OSDMap::calc_pg_role(whoami, pg->acting);
    if (pg->pool.info.is_replicated() || role == pg->pg_whoami.shard)
      pg->set_role(role);
    else
      pg->set_role(-1);

    pg->reg_next_scrub();

    PG::RecoveryCtx rctx(0, 0, 0, 0, 0, 0);
    pg->handle_loaded(&rctx);

    dout(10) << "load_pgs loaded " << *pg << " " << pg->pg_log.get_log() << dendl;
    if (pg->pg_log.is_dirty()) {
      ObjectStore::Transaction t;
      pg->write_if_dirty(t);
      store->apply_transaction(pg->osr.get(), std::move(t));
    }
    pg->unlock();
  }
  {
    RWLock::RLocker l(pg_map_lock);
    dout(0) << "load_pgs opened " << pg_map.size() << " pgs" << dendl;
  }

  // clean up old infos object?
  if (has_upgraded && store->exists(coll_t::meta(), OSD::make_infos_oid())) {
    dout(1) << __func__ << " removing legacy infos object" << dendl;
    ObjectStore::Transaction t;
    t.remove(coll_t::meta(), OSD::make_infos_oid());
    int r = store->apply_transaction(service.meta_osr.get(), std::move(t));
    if (r != 0) {
      derr << __func__ << ": apply_transaction returned "
           << cpp_strerror(r) << dendl;
      ceph_abort();
    }
  }

  build_past_intervals_parallel();
}


/*
 * build past_intervals efficiently on old, degraded, and buried
 * clusters.  this is important for efficiently catching up osds that
 * are way behind on maps to the current cluster state.
 *
 * this is a parallel version of PG::generate_past_intervals().
 * follow the same logic, but do all pgs at the same time so that we
 * can make a single pass across the osdmap history.
 */
void OSD::build_past_intervals_parallel()
{
  struct pistate {
    epoch_t start, end;
    vector<int> old_acting, old_up;
    epoch_t same_interval_since;
    int primary;
    int up_primary;
  };
  map<PG*,pistate> pis;

  // calculate junction of map range
  epoch_t end_epoch = superblock.oldest_map;
  epoch_t cur_epoch = superblock.newest_map;
  {
    RWLock::RLocker l(pg_map_lock);
    for (ceph::unordered_map<spg_t, PG*>::iterator i = pg_map.begin();
        i != pg_map.end();
        ++i) {
      PG *pg = i->second;

      auto rpib = pg->get_required_past_interval_bounds(
        pg->info,
        superblock.oldest_map);
      if (rpib.first >= rpib.second && pg->past_intervals.empty()) {
        if (pg->info.history.same_interval_since == 0) {
          pg->info.history.same_interval_since = rpib.second;
        }
        continue;
      } else {
        auto apib = pg->past_intervals.get_bounds();
        if (apib.second >= rpib.second &&
            apib.first <= rpib.first) {
          if (pg->info.history.same_interval_since == 0) {
            pg->info.history.same_interval_since = rpib.second;
          }
          continue;
        }
      }

      dout(10) << pg->info.pgid << " needs " << rpib.first << "-"
               << rpib.second << dendl;
      pistate& p = pis[pg];
      p.start = rpib.first;
      p.end = rpib.second;
      p.same_interval_since = 0;

      if (rpib.first < cur_epoch)
        cur_epoch = rpib.first;
      if (rpib.second > end_epoch)
        end_epoch = rpib.second;
    }
  }
  if (pis.empty()) {
    dout(10) << __func__ << " nothing to build" << dendl;
    return;
  }

  dout(1) << __func__ << " over " << cur_epoch << "-" << end_epoch << dendl;
  assert(cur_epoch <= end_epoch);

  OSDMapRef cur_map, last_map;
  for ( ; cur_epoch <= end_epoch; cur_epoch++) {
    dout(10) << __func__ << " epoch " << cur_epoch << dendl;
    last_map = cur_map;
    cur_map = get_map(cur_epoch);

    for (map<PG*,pistate>::iterator i = pis.begin(); i != pis.end(); ++i) {
      PG *pg = i->first;
      pistate& p = i->second;

      if (cur_epoch < p.start || cur_epoch > p.end)
        continue;

      vector<int> acting, up;
      int up_primary;
      int primary;
      pg_t pgid = pg->info.pgid.pgid;
      if (p.same_interval_since && last_map->get_pools().count(pgid.pool()))
        pgid = pgid.get_ancestor(last_map->get_pg_num(pgid.pool()));
      cur_map->pg_to_up_acting_osds(
        pgid, &up, &up_primary, &acting, &primary);

      if (p.same_interval_since == 0) {
        dout(10) << __func__ << " epoch " << cur_epoch << " pg " << pg->info.pgid
                 << " first map, acting " << acting
                 << " up " << up << ", same_interval_since = " << cur_epoch << dendl;
        p.same_interval_since = cur_epoch;
        p.old_up = up;
        p.old_acting = acting;
        p.primary = primary;
        p.up_primary = up_primary;
        continue;
      }
      assert(last_map);

      boost::scoped_ptr<IsPGRecoverablePredicate> recoverable(
        pg->get_is_recoverable_predicate());
      std::stringstream debug;
      bool new_interval = PastIntervals::check_new_interval(
        p.primary,
        primary,
        p.old_acting, acting,
        p.up_primary,
        up_primary,
        p.old_up, up,
        p.same_interval_since,
        pg->info.history.last_epoch_clean,
        cur_map, last_map,
        pgid,
        recoverable.get(),
        &pg->past_intervals,
        &debug);
      if (new_interval) {
        dout(10) << __func__ << " epoch " << cur_epoch << " pg " << pg->info.pgid
                 << " " << debug.str() << dendl;
        p.old_up = up;
        p.old_acting = acting;
        p.primary = primary;
        p.up_primary = up_primary;
        p.same_interval_since = cur_epoch;
      }
    }
  }

  // Now that past_intervals have been recomputed let's fix the same_interval_since
  // if it was cleared by import.
  for (map<PG*,pistate>::iterator i = pis.begin(); i != pis.end(); ++i) {
    PG *pg = i->first;
    pistate& p = i->second;

    if (pg->info.history.same_interval_since == 0) {
      assert(p.same_interval_since);
      dout(10) << __func__ << " fix same_interval_since " << p.same_interval_since << " pg " << *pg << dendl;
      dout(10) << __func__ << " past_intervals " << pg->past_intervals << dendl;
      // Fix it
      pg->info.history.same_interval_since = p.same_interval_since;
    }
  }

  // write info only at the end.  this is necessary because we check
  // whether the past_intervals go far enough back or forward in time,
  // but we don't check for holes.  we could avoid it by discarding
  // the previous past_intervals and rebuilding from scratch, or we
  // can just do this and commit all our work at the end.
  ObjectStore::Transaction t;
  int num = 0;
  for (map<PG*,pistate>::iterator i = pis.begin(); i != pis.end(); ++i) {
    PG *pg = i->first;
    pg->lock();
    pg->dirty_big_info = true;
    pg->dirty_info = true;
    pg->write_if_dirty(t);
    pg->unlock();

    // don't let the transaction get too big
    if (++num >= cct->_conf->osd_target_transaction_size) {
      store->apply_transaction(service.meta_osr.get(), std::move(t));
      t = ObjectStore::Transaction();
      num = 0;
    }
  }
  if (!t.empty())
    store->apply_transaction(service.meta_osr.get(), std::move(t));
}

/*
 * look up a pg.  if we have it, great.  if not, consider creating it IF the pg mapping
 * hasn't changed since the given epoch and we are the primary.
 */
int OSD::handle_pg_peering_evt(
  spg_t pgid,
  const pg_history_t& orig_history,
  const PastIntervals& pi,
  epoch_t epoch,
  PG::CephPeeringEvtRef evt)
{
  if (service.splitting(pgid)) {
    peering_wait_for_split[pgid].push_back(evt);
    return -EEXIST;
  }

  PG *pg = _lookup_lock_pg(pgid);
  if (!pg) {
    // same primary?
    if (!osdmap->have_pg_pool(pgid.pool()))
      return -EINVAL;
    int up_primary, acting_primary;
    vector<int> up, acting;
    osdmap->pg_to_up_acting_osds(
      pgid.pgid, &up, &up_primary, &acting, &acting_primary);

    pg_history_t history = orig_history;
    bool valid_history = project_pg_history(
      pgid, history, epoch, up, up_primary, acting, acting_primary);

    if (!valid_history || epoch < history.same_interval_since) {
      dout(10) << __func__ << pgid << " acting changed in "
               << history.same_interval_since << " (msg from " << epoch << ")"
               << dendl;
      return -EINVAL;
    }

    if (service.splitting(pgid)) {
      ceph_abort();
    }

    // do we need to resurrect a deleting pg?
    spg_t resurrected;
    PGRef old_pg_state;
    res_result result = _try_resurrect_pg(
      service.get_osdmap(),
      pgid,
      &resurrected,
      &old_pg_state);

    PG::RecoveryCtx rctx = create_context();
    switch (result) {
    case RES_NONE: {
      const pg_pool_t* pp = osdmap->get_pg_pool(pgid.pool());
      if (pp->has_flag(pg_pool_t::FLAG_EC_OVERWRITES) &&
          store->get_type() != "bluestore") {
        clog->warn() << "pg " << pgid
                     << " is at risk of silent data corruption: "
                     << "the pool allows ec overwrites but is not stored in "
                     << "bluestore, so deep scrubbing will not detect bitrot";
      }
      PG::_create(*rctx.transaction, pgid, pgid.get_split_bits(pp->get_pg_num()));
      PG::_init(*rctx.transaction, pgid, pp);

      int role = osdmap->calc_pg_role(whoami, acting, acting.size());
      if (!pp->is_replicated() && role != pgid.shard)
        role = -1;

      pg = _create_lock_pg(
        get_map(epoch),
        pgid, false, false,
        role,
        up, up_primary,
        acting, acting_primary,
        history, pi,
        *rctx.transaction);
      pg->handle_create(&rctx);
      pg->write_if_dirty(*rctx.transaction);
      dispatch_context(rctx, pg, osdmap);

      dout(10) << *pg << " is new" << dendl;

      pg->queue_peering_event(evt);
      wake_pg_waiters(pg);
      pg->unlock();
      return 0;
    }
    case RES_SELF: {
      old_pg_state->lock();
      OSDMapRef old_osd_map = old_pg_state->get_osdmap();
      int old_role = old_pg_state->role;
      vector<int> old_up = old_pg_state->up;
      int old_up_primary = old_pg_state->up_primary.osd;
      vector<int> old_acting = old_pg_state->acting;
      int old_primary = old_pg_state->primary.osd;
      pg_history_t old_history = old_pg_state->info.history;
      PastIntervals old_past_intervals = old_pg_state->past_intervals;
      old_pg_state->unlock();
      pg = _create_lock_pg(
        old_osd_map,
        resurrected,
        false,
        true,
        old_role,
        old_up,
        old_up_primary,
        old_acting,
        old_primary,
        old_history,
        old_past_intervals,
        *rctx.transaction);
      pg->handle_create(&rctx);
      pg->write_if_dirty(*rctx.transaction);
      dispatch_context(rctx, pg, osdmap);

      dout(10) << *pg << " is new (resurrected)" << dendl;

      pg->queue_peering_event(evt);
      wake_pg_waiters(pg);
      pg->unlock();
      return 0;
    }
    case RES_PARENT: {
      assert(old_pg_state);
      old_pg_state->lock();
      OSDMapRef old_osd_map = old_pg_state->get_osdmap();
      int old_role = old_pg_state->role;
      vector<int> old_up = old_pg_state->up;
      int old_up_primary = old_pg_state->up_primary.osd;
      vector<int> old_acting = old_pg_state->acting;
      int old_primary = old_pg_state->primary.osd;
      pg_history_t old_history = old_pg_state->info.history;
      PastIntervals old_past_intervals = old_pg_state->past_intervals;
      old_pg_state->unlock();
      PG *parent = _create_lock_pg(
        old_osd_map,
        resurrected,
        false,
        true,
        old_role,
        old_up,
        old_up_primary,
        old_acting,
        old_primary,
        old_history,
        old_past_intervals,
        *rctx.transaction
        );
      parent->handle_create(&rctx);
      parent->write_if_dirty(*rctx.transaction);
      dispatch_context(rctx, parent, osdmap);

      dout(10) << *parent << " is new" << dendl;

      assert(service.splitting(pgid));
      peering_wait_for_split[pgid].push_back(evt);

      //parent->queue_peering_event(evt);
      parent->queue_null(osdmap->get_epoch(), osdmap->get_epoch());
      wake_pg_waiters(parent);
      parent->unlock();
      return 0;
    }
    default:
      assert(0);
      return 0;
    }
  } else {
    // already had it.  did the mapping change?
    if (epoch < pg->info.history.same_interval_since) {
      dout(10) << *pg << __func__ << " acting changed in "
               << pg->info.history.same_interval_since
               << " (msg from " << epoch << ")" << dendl;
    } else {
      pg->queue_peering_event(evt);
    }
    pg->unlock();
    return -EEXIST;
  }
}


void OSD::build_initial_pg_history(
  spg_t pgid,
  epoch_t created,
  utime_t created_stamp,
  pg_history_t *h,
  PastIntervals *pi)
{
  dout(10) << __func__ << " " << pgid << " created " << created << dendl;
  h->epoch_created = created;
  h->epoch_pool_created = created;
  h->same_interval_since = created;
  h->same_up_since = created;
  h->same_primary_since = created;
  h->last_scrub_stamp = created_stamp;
  h->last_deep_scrub_stamp = created_stamp;
  h->last_clean_scrub_stamp = created_stamp;

  OSDMapRef lastmap = service.get_map(created);
  int up_primary, acting_primary;
  vector<int> up, acting;
  lastmap->pg_to_up_acting_osds(
    pgid.pgid, &up, &up_primary, &acting, &acting_primary);

  ostringstream debug;
  for (epoch_t e = created + 1; e <= osdmap->get_epoch(); ++e) {
    OSDMapRef osdmap = service.get_map(e);
    int new_up_primary, new_acting_primary;
    vector<int> new_up, new_acting;
    osdmap->pg_to_up_acting_osds(
      pgid.pgid, &new_up, &new_up_primary, &new_acting, &new_acting_primary);

    // this is a bit imprecise, but sufficient?
    struct min_size_predicate_t : public IsPGRecoverablePredicate {
      const pg_pool_t *pi;
      bool operator()(const set<pg_shard_t> &have) const {
        return have.size() >= pi->min_size;
      }
      min_size_predicate_t(const pg_pool_t *i) : pi(i) {}
    } min_size_predicate(osdmap->get_pg_pool(pgid.pgid.pool()));

    bool new_interval = PastIntervals::check_new_interval(
      acting_primary,
      new_acting_primary,
      acting, new_acting,
      up_primary,
      new_up_primary,
      up, new_up,
      h->same_interval_since,
      h->last_epoch_clean,
      osdmap,
      lastmap,
      pgid.pgid,
      &min_size_predicate,
      pi,
      &debug);
    if (new_interval) {
      h->same_interval_since = e;
    }
    if (up != new_up) {
      h->same_up_since = e;
    }
    if (acting_primary != new_acting_primary) {
      h->same_primary_since = e;
    }
    lastmap = osdmap;
  }
  dout(20) << __func__ << " " << debug.str() << dendl;
  dout(10) << __func__ << " " << *h << " " << *pi
           << " [" << (pi->empty() ? pair<epoch_t,epoch_t>(0,0) :
                       pi->get_bounds()) << ")"
           << dendl;
}

/**
 * Fill in the passed history so you know same_interval_since, same_up_since,
 * and same_primary_since.
 */
bool OSD::project_pg_history(spg_t pgid, pg_history_t& h, epoch_t from,
                             const vector<int>& currentup,
                             int currentupprimary,
                             const vector<int>& currentacting,
                             int currentactingprimary)
{
  dout(15) << "project_pg_history " << pgid
           << " from " << from << " to " << osdmap->get_epoch()
           << ", start " << h
           << dendl;

  epoch_t e;
  for (e = osdmap->get_epoch();
       e > from;
       e--) {
    // verify during intermediate epoch (e-1)
    OSDMapRef oldmap = service.try_get_map(e-1);
    if (!oldmap) {
      dout(15) << __func__ << ": found map gap, returning false" << dendl;
      return false;
    }
    assert(oldmap->have_pg_pool(pgid.pool()));

    int upprimary, actingprimary;
    vector<int> up, acting;
    oldmap->pg_to_up_acting_osds(
      pgid.pgid,
      &up,
      &upprimary,
      &acting,
      &actingprimary);

    // acting set change?
    if ((actingprimary != currentactingprimary ||
         upprimary != currentupprimary ||
         acting != currentacting ||
         up != currentup) && e > h.same_interval_since) {
      dout(15) << "project_pg_history " << pgid << " acting|up changed in " << e
               << " from " << acting << "/" << up
               << " " << actingprimary << "/" << upprimary
               << " -> " << currentacting << "/" << currentup
               << " " << currentactingprimary << "/" << currentupprimary
               << dendl;
      h.same_interval_since = e;
    }
    // split?
    if (pgid.is_split(oldmap->get_pg_num(pgid.pool()),
                      osdmap->get_pg_num(pgid.pool()),
                      0) && e > h.same_interval_since) {
      h.same_interval_since = e;
    }
    // up set change?
    if ((up != currentup || upprimary != currentupprimary)
        && e > h.same_up_since) {
      dout(15) << "project_pg_history " << pgid << " up changed in " << e
               << " from " << up << " " << upprimary
               << " -> " << currentup << " " << currentupprimary << dendl;
      h.same_up_since = e;
    }

    // primary change?
    if (OSDMap::primary_changed(
          actingprimary,
          acting,
          currentactingprimary,
          currentacting) &&
        e > h.same_primary_since) {
      dout(15) << "project_pg_history " << pgid << " primary changed in " << e << dendl;
      h.same_primary_since = e;
    }

    if (h.same_interval_since >= e && h.same_up_since >= e && h.same_primary_since >= e)
      break;
  }

  // base case: these floors should be the pg creation epoch if we didn't
  // find any changes.
  if (e == h.epoch_created) {
    if (!h.same_interval_since)
      h.same_interval_since = e;
    if (!h.same_up_since)
      h.same_up_since = e;
    if (!h.same_primary_since)
      h.same_primary_since = e;
  }

  dout(15) << "project_pg_history end " << h << dendl;
  return true;
}



void OSD::_add_heartbeat_peer(int p)
{
  if (p == whoami)
    return;
  HeartbeatInfo *hi;

  map<int,HeartbeatInfo>::iterator i = heartbeat_peers.find(p);
  if (i == heartbeat_peers.end()) {
    pair<ConnectionRef,ConnectionRef> cons = service.get_con_osd_hb(p, osdmap->get_epoch());
    if (!cons.first)
      return;
    hi = &heartbeat_peers[p];
    hi->peer = p;
    HeartbeatSession *s = new HeartbeatSession(p);
    hi->con_back = cons.first.get();
    hi->con_back->set_priv(s->get());
    if (cons.second) {
      hi->con_front = cons.second.get();
      hi->con_front->set_priv(s->get());
      dout(10) << "_add_heartbeat_peer: new peer osd." << p
               << " " << hi->con_back->get_peer_addr()
               << " " << hi->con_front->get_peer_addr()
               << dendl;
    } else {
      hi->con_front.reset(NULL);
      dout(10) << "_add_heartbeat_peer: new peer osd." << p
               << " " << hi->con_back->get_peer_addr()
               << dendl;
    }
    s->put();
  } else {
    hi = &i->second;
  }
  hi->epoch = osdmap->get_epoch();
}

void OSD::_remove_heartbeat_peer(int n)
{
  map<int,HeartbeatInfo>::iterator q = heartbeat_peers.find(n);
  assert(q != heartbeat_peers.end());
  dout(20) << " removing heartbeat peer osd." << n
           << " " << q->second.con_back->get_peer_addr()
           << " " << (q->second.con_front ? q->second.con_front->get_peer_addr() : entity_addr_t())
           << dendl;
  q->second.con_back->mark_down();
  if (q->second.con_front) {
    q->second.con_front->mark_down();
  }
  heartbeat_peers.erase(q);
}

void OSD::need_heartbeat_peer_update()
{
  if (is_stopping())
    return;
  dout(20) << "need_heartbeat_peer_update" << dendl;
  heartbeat_set_peers_need_update();
}

void OSD::maybe_update_heartbeat_peers()
{
  assert(osd_lock.is_locked());

  if (is_waiting_for_healthy()) {
    utime_t now = ceph_clock_now();
    if (last_heartbeat_resample == utime_t()) {
      last_heartbeat_resample = now;
      heartbeat_set_peers_need_update();
    } else if (!heartbeat_peers_need_update()) {
      utime_t dur = now - last_heartbeat_resample;
      if (dur > cct->_conf->osd_heartbeat_grace) {
        dout(10) << "maybe_update_heartbeat_peers forcing update after " << dur << " seconds" << dendl;
        heartbeat_set_peers_need_update();
        last_heartbeat_resample = now;
        reset_heartbeat_peers();   // we want *new* peers!
      }
    }
  }

  if (!heartbeat_peers_need_update())
    return;
  heartbeat_clear_peers_need_update();

  Mutex::Locker l(heartbeat_lock);

  dout(10) << "maybe_update_heartbeat_peers updating" << dendl;


  // build heartbeat from set
  if (is_active()) {
    RWLock::RLocker l(pg_map_lock);
    for (ceph::unordered_map<spg_t, PG*>::iterator i = pg_map.begin();
         i != pg_map.end();
         ++i) {
      PG *pg = i->second;
      pg->heartbeat_peer_lock.Lock();
      dout(20) << i->first << " heartbeat_peers " << pg->heartbeat_peers << dendl;
      for (set<int>::iterator p = pg->heartbeat_peers.begin();
           p != pg->heartbeat_peers.end();
           ++p)
        if (osdmap->is_up(*p))
          _add_heartbeat_peer(*p);
      for (set<int>::iterator p = pg->probe_targets.begin();
           p != pg->probe_targets.end();
           ++p)
        if (osdmap->is_up(*p))
          _add_heartbeat_peer(*p);
      pg->heartbeat_peer_lock.Unlock();
    }
  }

  // include next and previous up osds to ensure we have a fully-connected set
  set<int> want, extras;
  int next = osdmap->get_next_up_osd_after(whoami);
  if (next >= 0)
    want.insert(next);
  int prev = osdmap->get_previous_up_osd_before(whoami);
  if (prev >= 0 && prev != next)
    want.insert(prev);

  for (set<int>::iterator p = want.begin(); p != want.end(); ++p) {
    dout(10) << " adding neighbor peer osd." << *p << dendl;
    extras.insert(*p);
    _add_heartbeat_peer(*p);
  }

  // remove down peers; enumerate extras
  map<int,HeartbeatInfo>::iterator p = heartbeat_peers.begin();
  while (p != heartbeat_peers.end()) {
    if (!osdmap->is_up(p->first)) {
      int o = p->first;
      ++p;
      _remove_heartbeat_peer(o);
      continue;
    }
    if (p->second.epoch < osdmap->get_epoch()) {
      extras.insert(p->first);
    }
    ++p;
  }

  // too few?
  int start = osdmap->get_next_up_osd_after(whoami);
  for (int n = start; n >= 0; ) {
    if ((int)heartbeat_peers.size() >= cct->_conf->osd_heartbeat_min_peers)
      break;
    if (!extras.count(n) && !want.count(n) && n != whoami) {
      dout(10) << " adding random peer osd." << n << dendl;
      extras.insert(n);
      _add_heartbeat_peer(n);
    }
    n = osdmap->get_next_up_osd_after(n);
    if (n == start)
      break;  // came full circle; stop
  }

  // too many?
  for (set<int>::iterator p = extras.begin();
       (int)heartbeat_peers.size() > cct->_conf->osd_heartbeat_min_peers && p != extras.end();
       ++p) {
    if (want.count(*p))
      continue;
    _remove_heartbeat_peer(*p);
  }

  dout(10) << "maybe_update_heartbeat_peers " << heartbeat_peers.size() << " peers, extras " << extras << dendl;
}

void OSD::reset_heartbeat_peers()
{
  assert(osd_lock.is_locked());
  dout(10) << "reset_heartbeat_peers" << dendl;
  Mutex::Locker l(heartbeat_lock);
  while (!heartbeat_peers.empty()) {
    HeartbeatInfo& hi = heartbeat_peers.begin()->second;
    hi.con_back->mark_down();
    if (hi.con_front) {
      hi.con_front->mark_down();
    }
    heartbeat_peers.erase(heartbeat_peers.begin());
  }
  failure_queue.clear();
}

void OSD::handle_osd_ping(MOSDPing *m)
{
  if (superblock.cluster_fsid != m->fsid) {
    dout(20) << "handle_osd_ping from " << m->get_source_inst()
             << " bad fsid " << m->fsid << " != " << superblock.cluster_fsid << dendl;
    m->put();
    return;
  }

  int from = m->get_source().num();

  heartbeat_lock.Lock();
  if (is_stopping()) {
    heartbeat_lock.Unlock();
    m->put();
    return;
  }

  OSDMapRef curmap = service.get_osdmap();
  assert(curmap);

  switch (m->op) {

  case MOSDPing::PING:
    {
      if (cct->_conf->osd_debug_drop_ping_probability > 0) {
        auto heartbeat_drop = debug_heartbeat_drops_remaining.find(from);
        if (heartbeat_drop != debug_heartbeat_drops_remaining.end()) {
          if (heartbeat_drop->second == 0) {
            debug_heartbeat_drops_remaining.erase(heartbeat_drop);
          } else {
            --heartbeat_drop->second;
            dout(5) << "Dropping heartbeat from " << from
                    << ", " << heartbeat_drop->second
                    << " remaining to drop" << dendl;
            break;
          }
        } else if (cct->_conf->osd_debug_drop_ping_probability >
                   ((((double)(rand()%100))/100.0))) {
          heartbeat_drop =
            debug_heartbeat_drops_remaining.insert(std::make_pair(from,
                             cct->_conf->osd_debug_drop_ping_duration)).first;
          dout(5) << "Dropping heartbeat from " << from
                  << ", " << heartbeat_drop->second
                  << " remaining to drop" << dendl;
          break;
        }
      }

      if (!cct->get_heartbeat_map()->is_healthy()) {
        dout(10) << "internal heartbeat not healthy, dropping ping request" << dendl;
        break;
      }

      Message *r = new MOSDPing(monc->get_fsid(),
                                curmap->get_epoch(),
                                MOSDPing::PING_REPLY, m->stamp,
                                cct->_conf->osd_heartbeat_min_size);
      m->get_connection()->send_message(r);

      if (curmap->is_up(from)) {
        service.note_peer_epoch(from, m->map_epoch);
        if (is_active()) {
          ConnectionRef con = service.get_con_osd_cluster(from, curmap->get_epoch());
          if (con) {
            service.share_map_peer(from, con.get());
          }
        }
      } else if (!curmap->exists(from) ||
                 curmap->get_down_at(from) > m->map_epoch) {
        // tell them they have died
        Message *r = new MOSDPing(monc->get_fsid(),
                                  curmap->get_epoch(),
                                  MOSDPing::YOU_DIED,
                                  m->stamp,
                                  cct->_conf->osd_heartbeat_min_size);
        m->get_connection()->send_message(r);
      }
    }
    break;

  case MOSDPing::PING_REPLY:
    {
      map<int,HeartbeatInfo>::iterator i = heartbeat_peers.find(from);
      if (i != heartbeat_peers.end()) {
        if (m->get_connection() == i->second.con_back) {
          dout(25) << "handle_osd_ping got reply from osd." << from
                   << " first_tx " << i->second.first_tx
                   << " last_tx " << i->second.last_tx
                   << " last_rx_back " << i->second.last_rx_back << " -> " << m->stamp
                   << " last_rx_front " << i->second.last_rx_front
                   << dendl;
          i->second.last_rx_back = m->stamp;
          // if there is no front con, set both stamps.
          if (i->second.con_front == NULL)
            i->second.last_rx_front = m->stamp;
        } else if (m->get_connection() == i->second.con_front) {
          dout(25) << "handle_osd_ping got reply from osd." << from
                   << " first_tx " << i->second.first_tx
                   << " last_tx " << i->second.last_tx
                   << " last_rx_back " << i->second.last_rx_back
                   << " last_rx_front " << i->second.last_rx_front << " -> " << m->stamp
                   << dendl;
          i->second.last_rx_front = m->stamp;
        }

        utime_t cutoff = ceph_clock_now();
        cutoff -= cct->_conf->osd_heartbeat_grace;
        if (i->second.is_healthy(cutoff)) {
          // Cancel false reports
          auto failure_queue_entry = failure_queue.find(from);
          if (failure_queue_entry != failure_queue.end()) {
            dout(10) << "handle_osd_ping canceling queued "
                     << "failure report for osd." << from << dendl;
            failure_queue.erase(failure_queue_entry);
          }

          auto failure_pending_entry = failure_pending.find(from);
          if (failure_pending_entry != failure_pending.end()) {
            dout(10) << "handle_osd_ping canceling in-flight "
                     << "failure report for osd." << from << dendl;
            send_still_alive(curmap->get_epoch(),
                             failure_pending_entry->second.second);
            failure_pending.erase(failure_pending_entry);
          }
        }
      }

      if (m->map_epoch &&
          curmap->is_up(from)) {
        service.note_peer_epoch(from, m->map_epoch);
        if (is_active()) {
          ConnectionRef con = service.get_con_osd_cluster(from, curmap->get_epoch());
          if (con) {
            service.share_map_peer(from, con.get());
          }
        }
      }
    }
    break;

  case MOSDPing::YOU_DIED:
    dout(10) << "handle_osd_ping " << m->get_source_inst()
             << " says i am down in " << m->map_epoch << dendl;
    osdmap_subscribe(curmap->get_epoch()+1, false);
    break;
  }

  heartbeat_lock.Unlock();
  m->put();
}

void OSD::heartbeat_entry()
{
  Mutex::Locker l(heartbeat_lock);
  if (is_stopping())
    return;
  while (!heartbeat_stop) {
    heartbeat();

    double wait = .5 + ((float)(rand() % 10)/10.0) * (float)cct->_conf->osd_heartbeat_interval;
    utime_t w;
    w.set_from_double(wait);
    dout(30) << "heartbeat_entry sleeping for " << wait << dendl;
    heartbeat_cond.WaitInterval(heartbeat_lock, w);
    if (is_stopping())
      return;
    dout(30) << "heartbeat_entry woke up" << dendl;
  }
}

void OSD::heartbeat_check()
{
  assert(heartbeat_lock.is_locked());
  utime_t now = ceph_clock_now();

  // check for heartbeat replies (move me elsewhere?)
  utime_t cutoff = now;
  cutoff -= cct->_conf->osd_heartbeat_grace;
  for (map<int,HeartbeatInfo>::iterator p = heartbeat_peers.begin();
       p != heartbeat_peers.end();
       ++p) {

    if (p->second.first_tx == utime_t()) {
      dout(25) << "heartbeat_check we haven't sent ping to osd." << p->first
               << "yet, skipping" << dendl;
      continue;
    }

    dout(25) << "heartbeat_check osd." << p->first
             << " first_tx " << p->second.first_tx
             << " last_tx " << p->second.last_tx
             << " last_rx_back " << p->second.last_rx_back
             << " last_rx_front " << p->second.last_rx_front
             << dendl;
    if (p->second.is_unhealthy(cutoff)) {
      if (p->second.last_rx_back == utime_t() ||
          p->second.last_rx_front == utime_t()) {
        derr << "heartbeat_check: no reply from " << p->second.con_front->get_peer_addr().get_sockaddr()
             << " osd." << p->first << " ever on either front or back, first ping sent "
             << p->second.first_tx << " (cutoff " << cutoff << ")" << dendl;
        // fail
        failure_queue[p->first] = p->second.last_tx;
      } else {
        derr << "heartbeat_check: no reply from " << p->second.con_front->get_peer_addr().get_sockaddr()
             << " osd." << p->first << " since back " << p->second.last_rx_back
             << " front " << p->second.last_rx_front
             << " (cutoff " << cutoff << ")" << dendl;
        // fail
        failure_queue[p->first] = MIN(p->second.last_rx_back, p->second.last_rx_front);
      }
    }
  }
}

void OSD::heartbeat()
{
  dout(30) << "heartbeat" << dendl;

  // get CPU load avg
  double loadavgs[1];
  int n_samples = 86400 / cct->_conf->osd_heartbeat_interval;
  if (getloadavg(loadavgs, 1) == 1) {
    logger->set(l_osd_loadavg, 100 * loadavgs[0]);
    daily_loadavg = (daily_loadavg * (n_samples - 1) + loadavgs[0]) / n_samples;
    dout(30) << "heartbeat: daily_loadavg " << daily_loadavg << dendl;
  }

  dout(30) << "heartbeat checking stats" << dendl;

  // refresh stats?
  vector<int> hb_peers;
  for (map<int,HeartbeatInfo>::iterator p = heartbeat_peers.begin();
       p != heartbeat_peers.end();
       ++p)
    hb_peers.push_back(p->first);
  service.update_osd_stat(hb_peers);

  dout(5) << "heartbeat: " << service.get_osd_stat() << dendl;

  utime_t now = ceph_clock_now();

  // send heartbeats
  for (map<int,HeartbeatInfo>::iterator i = heartbeat_peers.begin();
       i != heartbeat_peers.end();
       ++i) {
    int peer = i->first;
    i->second.last_tx = now;
    if (i->second.first_tx == utime_t())
      i->second.first_tx = now;
    dout(30) << "heartbeat sending ping to osd." << peer << dendl;
    i->second.con_back->send_message(new MOSDPing(monc->get_fsid(),
                                          service.get_osdmap()->get_epoch(),
                                          MOSDPing::PING, now,
                                          cct->_conf->osd_heartbeat_min_size));

    if (i->second.con_front)
      i->second.con_front->send_message(new MOSDPing(monc->get_fsid(),
                                             service.get_osdmap()->get_epoch(),
                                             MOSDPing::PING, now,
                                          cct->_conf->osd_heartbeat_min_size));
  }

  logger->set(l_osd_hb_to, heartbeat_peers.size());

  // hmm.. am i all alone?
  dout(30) << "heartbeat lonely?" << dendl;
  if (heartbeat_peers.empty()) {
    if (now - last_mon_heartbeat > cct->_conf->osd_mon_heartbeat_interval && is_active()) {
      last_mon_heartbeat = now;
      dout(10) << "i have no heartbeat peers; checking mon for new map" << dendl;
      osdmap_subscribe(osdmap->get_epoch() + 1, false);
    }
  }

  dout(30) << "heartbeat done" << dendl;
}

bool OSD::heartbeat_reset(Connection *con)
{
  HeartbeatSession *s = static_cast<HeartbeatSession*>(con->get_priv());
  if (s) {
    heartbeat_lock.Lock();
    if (is_stopping()) {
      heartbeat_lock.Unlock();
      s->put();
      return true;
    }
    map<int,HeartbeatInfo>::iterator p = heartbeat_peers.find(s->peer);
    if (p != heartbeat_peers.end() &&
        (p->second.con_back == con ||
         p->second.con_front == con)) {
      dout(10) << "heartbeat_reset failed hb con " << con << " for osd." << p->second.peer
               << ", reopening" << dendl;
      if (con != p->second.con_back) {
        p->second.con_back->mark_down();
      }
      p->second.con_back.reset(NULL);
      if (p->second.con_front && con != p->second.con_front) {
        p->second.con_front->mark_down();
      }
      p->second.con_front.reset(NULL);
      pair<ConnectionRef,ConnectionRef> newcon = service.get_con_osd_hb(p->second.peer, p->second.epoch);
      if (newcon.first) {
        p->second.con_back = newcon.first.get();
        p->second.con_back->set_priv(s->get());
        if (newcon.second) {
          p->second.con_front = newcon.second.get();
          p->second.con_front->set_priv(s->get());
        }
      } else {
        dout(10) << "heartbeat_reset failed hb con " << con << " for osd." << p->second.peer
                 << ", raced with osdmap update, closing out peer" << dendl;
        heartbeat_peers.erase(p);
      }
    } else {
      dout(10) << "heartbeat_reset closing (old) failed hb con " << con << dendl;
    }
    heartbeat_lock.Unlock();
    s->put();
  }
  return true;
}



// =========================================

void OSD::tick()
{
  assert(osd_lock.is_locked());
  dout(10) << "tick" << dendl;

  if (is_active() || is_waiting_for_healthy()) {
    maybe_update_heartbeat_peers();
  }

  if (is_waiting_for_healthy()) {
    start_boot();
  } else if (is_preboot() &&
             waiting_for_luminous_mons &&
             monc->monmap.get_required_features().contains_all(
               ceph::features::mon::FEATURE_LUMINOUS)) {
    // mon upgrade finished!
    start_boot();
  }

  do_waiters();

  tick_timer.add_event_after(OSD_TICK_INTERVAL, new C_Tick(this));
}

void OSD::tick_without_osd_lock()
{
  assert(tick_timer_lock.is_locked());
  dout(10) << "tick_without_osd_lock" << dendl;

  logger->set(l_osd_buf, buffer::get_total_alloc());
  logger->set(l_osd_history_alloc_bytes, SHIFT_ROUND_UP(buffer::get_history_alloc_bytes(), 20));
  logger->set(l_osd_history_alloc_num, buffer::get_history_alloc_num());
  logger->set(l_osd_cached_crc, buffer::get_cached_crc());
  logger->set(l_osd_cached_crc_adjusted, buffer::get_cached_crc_adjusted());
  logger->set(l_osd_missed_crc, buffer::get_missed_crc());

  // osd_lock is not being held, which means the OSD state
  // might change when doing the monitor report
  if (is_active() || is_waiting_for_healthy()) {
    heartbeat_lock.Lock();
    heartbeat_check();
    heartbeat_lock.Unlock();

    map_lock.get_read();
    Mutex::Locker l(mon_report_lock);

    // mon report?
    bool reset = false;
    bool report = false;
    utime_t now = ceph_clock_now();
    pg_stat_queue_lock.Lock();
    double backoff = stats_ack_timeout / cct->_conf->osd_mon_ack_timeout;
    double adjusted_min = cct->_conf->osd_mon_report_interval_min * backoff;
    // note: we shouldn't adjust max because it must remain < the
    // mon's mon_osd_report_timeout (which defaults to 1.5x our
    // value).
    double max = cct->_conf->osd_mon_report_interval_max;
    if (!outstanding_pg_stats.empty() &&
        (now - stats_ack_timeout) > last_pg_stats_ack) {
      dout(1) << __func__ << " mon hasn't acked PGStats in "
              << now - last_pg_stats_ack
              << " seconds, reconnecting elsewhere" << dendl;
      reset = true;
      last_pg_stats_ack = now;  // reset clock
      last_pg_stats_sent = utime_t();
      stats_ack_timeout =
        MAX(cct->_conf->osd_mon_ack_timeout,
            stats_ack_timeout * cct->_conf->osd_stats_ack_timeout_factor);
      outstanding_pg_stats.clear();
    }
    if (now - last_pg_stats_sent > max) {
      osd_stat_updated = true;
      report = true;
    } else if (service.need_fullness_update()) {
      report = true;
    } else if ((int)outstanding_pg_stats.size() >=
               cct->_conf->osd_mon_report_max_in_flight) {
      dout(20) << __func__ << " have max " << outstanding_pg_stats
               << " stats updates in flight" << dendl;
    } else {
      if (now - last_mon_report > adjusted_min) {
        dout(20) << __func__ << " stats backoff " << backoff
                 << " adjusted_min " << adjusted_min << " - sending report"
                 << dendl;
        osd_stat_updated = true;
        report = true;
      }
    }
    pg_stat_queue_lock.Unlock();

    if (reset) {
      monc->reopen_session();
    } else if (report) {
      last_mon_report = now;

      // do any pending reports
      send_full_update();
      send_failures();
      if (osdmap->require_osd_release < CEPH_RELEASE_LUMINOUS) {
        send_pg_stats(now);
      }
    }
    map_lock.put_read();
  }

  if (is_active()) {
    if (!scrub_random_backoff()) {
      sched_scrub();
    }
    service.promote_throttle_recalibrate();
    bool need_send_beacon = false;
    const auto now = ceph::coarse_mono_clock::now();
    {
      // borrow lec lock to pretect last_sent_beacon from changing
      Mutex::Locker l{min_last_epoch_clean_lock};
      const auto elapsed = now - last_sent_beacon;
      if (chrono::duration_cast<chrono::seconds>(elapsed).count() >
        cct->_conf->osd_beacon_report_interval) {
        need_send_beacon = true;
      }
    }
    if (need_send_beacon) {
      send_beacon(now);
    }
  }

  check_ops_in_flight();
  service.kick_recovery_queue();
  tick_timer_without_osd_lock.add_event_after(OSD_TICK_INTERVAL, new C_Tick_WithoutOSDLock(this));
}

void OSD::check_ops_in_flight()
{
  vector<string> warnings;
  if (op_tracker.check_ops_in_flight(warnings)) {
    for (vector<string>::iterator i = warnings.begin();
        i != warnings.end();
        ++i) {
      clog->warn() << *i;
    }
  }
}

// Usage:
//   setomapval <pool-id> [namespace/]<obj-name> <key> <val>
//   rmomapkey <pool-id> [namespace/]<obj-name> <key>
//   setomapheader <pool-id> [namespace/]<obj-name> <header>
//   getomap <pool> [namespace/]<obj-name>
//   truncobj <pool-id> [namespace/]<obj-name> <newlen>
//   injectmdataerr [namespace/]<obj-name> [shardid]
//   injectdataerr [namespace/]<obj-name> [shardid]
//
//   set_recovery_delay [utime]
void TestOpsSocketHook::test_ops(OSDService *service, ObjectStore *store,
     const std::string &command, cmdmap_t& cmdmap, ostream &ss)
{
  //Test support
  //Support changing the omap on a single osd by using the Admin Socket to
  //directly request the osd make a change.
  if (command == "setomapval" || command == "rmomapkey" ||
      command == "setomapheader" || command == "getomap" ||
      command == "truncobj" || command == "injectmdataerr" ||
      command == "injectdataerr"
    ) {
    pg_t rawpg;
    int64_t pool;
    OSDMapRef curmap = service->get_osdmap();
    int r = -1;

    string poolstr;

    cmd_getval(service->cct, cmdmap, "pool", poolstr);
    pool = curmap->lookup_pg_pool_name(poolstr);
    //If we can't find it by name then maybe id specified
    if (pool < 0 && isdigit(poolstr[0]))
      pool = atoll(poolstr.c_str());
    if (pool < 0) {
      ss << "Invalid pool" << poolstr;
      return;
    }

    string objname, nspace;
    cmd_getval(service->cct, cmdmap, "objname", objname);
    std::size_t found = objname.find_first_of('/');
    if (found != string::npos) {
      nspace = objname.substr(0, found);
      objname = objname.substr(found+1);
    }
    object_locator_t oloc(pool, nspace);
    r = curmap->object_locator_to_pg(object_t(objname), oloc,  rawpg);

    if (r < 0) {
      ss << "Invalid namespace/objname";
      return;
    }

    int64_t shardid;
    cmd_getval(service->cct, cmdmap, "shardid", shardid, int64_t(shard_id_t::NO_SHARD));
    hobject_t obj(object_t(objname), string(""), CEPH_NOSNAP, rawpg.ps(), pool, nspace);
    ghobject_t gobj(obj, ghobject_t::NO_GEN, shard_id_t(uint8_t(shardid)));
    spg_t pgid(curmap->raw_pg_to_pg(rawpg), shard_id_t(shardid));
    if (curmap->pg_is_ec(rawpg)) {
        if ((command != "injectdataerr") && (command != "injectmdataerr")) {
            ss << "Must not call on ec pool, except injectdataerr or injectmdataerr";
            return;
        }
    }

    ObjectStore::Transaction t;

    if (command == "setomapval") {
      map<string, bufferlist> newattrs;
      bufferlist val;
      string key, valstr;
      cmd_getval(service->cct, cmdmap, "key", key);
      cmd_getval(service->cct, cmdmap, "val", valstr);

      val.append(valstr);
      newattrs[key] = val;
      t.omap_setkeys(coll_t(pgid), ghobject_t(obj), newattrs);
      r = store->apply_transaction(service->meta_osr.get(), std::move(t));
      if (r < 0)
        ss << "error=" << r;
      else
        ss << "ok";
    } else if (command == "rmomapkey") {
      string key;
      set<string> keys;
      cmd_getval(service->cct, cmdmap, "key", key);

      keys.insert(key);
      t.omap_rmkeys(coll_t(pgid), ghobject_t(obj), keys);
      r = store->apply_transaction(service->meta_osr.get(), std::move(t));
      if (r < 0)
        ss << "error=" << r;
      else
        ss << "ok";
    } else if (command == "setomapheader") {
      bufferlist newheader;
      string headerstr;

      cmd_getval(service->cct, cmdmap, "header", headerstr);
      newheader.append(headerstr);
      t.omap_setheader(coll_t(pgid), ghobject_t(obj), newheader);
      r = store->apply_transaction(service->meta_osr.get(), std::move(t));
      if (r < 0)
        ss << "error=" << r;
      else
        ss << "ok";
    } else if (command == "getomap") {
      //Debug: Output entire omap
      bufferlist hdrbl;
      map<string, bufferlist> keyvals;
      r = store->omap_get(coll_t(pgid), ghobject_t(obj), &hdrbl, &keyvals);
      if (r >= 0) {
          ss << "header=" << string(hdrbl.c_str(), hdrbl.length());
          for (map<string, bufferlist>::iterator it = keyvals.begin();
              it != keyvals.end(); ++it)
            ss << " key=" << (*it).first << " val="
               << string((*it).second.c_str(), (*it).second.length());
      } else {
          ss << "error=" << r;
      }
    } else if (command == "truncobj") {
      int64_t trunclen;
      cmd_getval(service->cct, cmdmap, "len", trunclen);
      t.truncate(coll_t(pgid), ghobject_t(obj), trunclen);
      r = store->apply_transaction(service->meta_osr.get(), std::move(t));
      if (r < 0)
        ss << "error=" << r;
      else
        ss << "ok";
    } else if (command == "injectdataerr") {
      store->inject_data_error(gobj);
      ss << "ok";
    } else if (command == "injectmdataerr") {
      store->inject_mdata_error(gobj);
      ss << "ok";
    }
    return;
  }
  if (command == "set_recovery_delay") {
    int64_t delay;
    cmd_getval(service->cct, cmdmap, "utime", delay, (int64_t)0);
    ostringstream oss;
    oss << delay;
    int r = service->cct->_conf->set_val("osd_recovery_delay_start",
                                         oss.str().c_str());
    if (r != 0) {
      ss << "set_recovery_delay: error setting "
         << "osd_recovery_delay_start to '" << delay << "': error "
         << r;
      return;
    }
    service->cct->_conf->apply_changes(NULL);
    ss << "set_recovery_delay: set osd_recovery_delay_start "
       << "to " << service->cct->_conf->osd_recovery_delay_start;
    return;
  }
  if (command ==  "trigger_scrub") {
    spg_t pgid;
    OSDMapRef curmap = service->get_osdmap();

    string pgidstr;

    cmd_getval(service->cct, cmdmap, "pgid", pgidstr);
    if (!pgid.parse(pgidstr.c_str())) {
      ss << "Invalid pgid specified";
      return;
    }

    PG *pg = service->osd->_lookup_lock_pg(pgid);
    if (pg == nullptr) {
      ss << "Can't find pg " << pgid;
      return;
    }

    if (pg->is_primary()) {
      pg->unreg_next_scrub();
      const pg_pool_t *p = curmap->get_pg_pool(pgid.pool());
      double pool_scrub_max_interval = 0;
      p->opts.get(pool_opts_t::SCRUB_MAX_INTERVAL, &pool_scrub_max_interval);
      double scrub_max_interval = pool_scrub_max_interval > 0 ?
        pool_scrub_max_interval : g_conf->osd_scrub_max_interval;
      // Instead of marking must_scrub force a schedule scrub
      utime_t stamp = ceph_clock_now();
      stamp -= scrub_max_interval;
      stamp -=  100.0;  // push back last scrub more for good measure
      pg->info.history.last_scrub_stamp = stamp;
      pg->reg_next_scrub();
      ss << "ok";
    } else {
      ss << "Not primary";
    }
    pg->unlock();
    return;
  }
  if (command == "injectfull") {
    int64_t count;
    string type;
    OSDService::s_names state;
    cmd_getval(service->cct, cmdmap, "type", type, string("full"));
    cmd_getval(service->cct, cmdmap, "count", count, (int64_t)-1);
    if (type == "none" || count == 0) {
      type = "none";
      count = 0;
    }
    state = service->get_full_state(type);
    if (state == OSDService::s_names::INVALID) {
      ss << "Invalid type use (none, nearfull, backfillfull, full, failsafe)";
      return;
    }
    service->set_injectfull(state, count);
    return;
  }
  ss << "Internal error - command=" << command;
}

// =========================================
bool remove_dir(
  CephContext *cct,
  ObjectStore *store, SnapMapper *mapper,
  OSDriver *osdriver,
  ObjectStore::Sequencer *osr,
  coll_t coll, DeletingStateRef dstate,
  bool *finished,
  ThreadPool::TPHandle &handle)
{
  vector<ghobject_t> olist;
  int64_t num = 0;
  ObjectStore::Transaction t;
  ghobject_t next;
  handle.reset_tp_timeout();
  store->collection_list(
    coll,
    next,
    ghobject_t::get_max(),
    store->get_ideal_list_max(),
    &olist,
    &next);
  generic_dout(10) << __func__ << " " << olist << dendl;
  // default cont to true, this is safe because caller(OSD::RemoveWQ::_process()) 
  // will recheck the answer before it really goes on.
  bool cont = true;
  for (vector<ghobject_t>::iterator i = olist.begin();
       i != olist.end();
       ++i) {
    if (i->is_pgmeta())
      continue;
    OSDriver::OSTransaction _t(osdriver->get_transaction(&t));
    int r = mapper->remove_oid(i->hobj, &_t);
    if (r != 0 && r != -ENOENT) {
      ceph_abort();
    }
    t.remove(coll, *i);
    if (++num >= cct->_conf->osd_target_transaction_size) {
      C_SaferCond waiter;
      store->queue_transaction(osr, std::move(t), &waiter);
      cont = dstate->pause_clearing();
      handle.suspend_tp_timeout();
      waiter.wait();
      handle.reset_tp_timeout();
      if (cont)
        cont = dstate->resume_clearing();
      if (!cont)
        return false;
      t = ObjectStore::Transaction();
      num = 0;
    }
  }
  if (num) {
    C_SaferCond waiter;
    store->queue_transaction(osr, std::move(t), &waiter);
    cont = dstate->pause_clearing();
    handle.suspend_tp_timeout();
    waiter.wait();
    handle.reset_tp_timeout();
    if (cont)
      cont = dstate->resume_clearing();
  }
  // whether there are more objects to remove in the collection
  *finished = next.is_max();
  return cont;
}

void OSD::RemoveWQ::_process(
  pair<PGRef, DeletingStateRef> item,
  ThreadPool::TPHandle &handle)
{
  FUNCTRACE();
  PGRef pg(item.first);
  SnapMapper &mapper = pg->snap_mapper;
  OSDriver &driver = pg->osdriver;
  coll_t coll = coll_t(pg->info.pgid);
  pg->osr->flush();
  bool finished = false;

  if (!item.second->start_or_resume_clearing())
    return;

  bool cont = remove_dir(
    pg->cct, store, &mapper, &driver, pg->osr.get(), coll, item.second,
    &finished, handle);
  if (!cont)
    return;
  if (!finished) {
    if (item.second->pause_clearing())
      queue_front(item);
    return;
  }

  if (!item.second->start_deleting())
    return;

  ObjectStore::Transaction t;
  PGLog::clear_info_log(pg->info.pgid, &t);

  if (cct->_conf->osd_inject_failure_on_pg_removal) {
    generic_derr << "osd_inject_failure_on_pg_removal" << dendl;
    _exit(1);
  }
  t.remove_collection(coll);

  // We need the sequencer to stick around until the op is complete
  store->queue_transaction(
    pg->osr.get(),
    std::move(t),
    0, // onapplied
    0, // oncommit
    0, // onreadable sync
    new ContainerContext<PGRef>(pg),
    TrackedOpRef());

  item.second->finish_deleting();
}
// =========================================

void OSD::ms_handle_connect(Connection *con)
{
  dout(10) << __func__ << " con " << con << dendl;
  if (con->get_peer_type() == CEPH_ENTITY_TYPE_MON) {
    Mutex::Locker l(osd_lock);
    if (is_stopping())
      return;
    dout(10) << __func__ << " on mon" << dendl;

    if (is_preboot()) {
      start_boot();
    } else if (is_booting()) {
      _send_boot();       // resend boot message
    } else {
      map_lock.get_read();
      Mutex::Locker l2(mon_report_lock);

      utime_t now = ceph_clock_now();
      last_mon_report = now;

      // resend everything, it's a new session
      send_full_update();
      send_alive();
      service.requeue_pg_temp();
      service.send_pg_temp();
      requeue_failures();
      send_failures();
      if (osdmap->require_osd_release < CEPH_RELEASE_LUMINOUS) {
        send_pg_stats(now);
      }

      map_lock.put_read();
      if (is_active()) {
        send_beacon(ceph::coarse_mono_clock::now());
      }
    }

    // full map requests may happen while active or pre-boot
    if (requested_full_first) {
      rerequest_full_maps();
    }
  }
}

void OSD::ms_handle_fast_connect(Connection *con)
{
  if (con->get_peer_type() != CEPH_ENTITY_TYPE_MON &&
      con->get_peer_type() != CEPH_ENTITY_TYPE_MGR) {
    Session *s = static_cast<Session*>(con->get_priv());
    if (!s) {
      s = new Session(cct);
      con->set_priv(s->get());
      s->con = con;
      dout(10) << " new session (outgoing) " << s << " con=" << s->con
          << " addr=" << s->con->get_peer_addr() << dendl;
      // we don't connect to clients
      assert(con->get_peer_type() == CEPH_ENTITY_TYPE_OSD);
      s->entity_name.set_type(CEPH_ENTITY_TYPE_OSD);
    }
    s->put();
  }
}

void OSD::ms_handle_fast_accept(Connection *con)
{
  if (con->get_peer_type() != CEPH_ENTITY_TYPE_MON &&
      con->get_peer_type() != CEPH_ENTITY_TYPE_MGR) {
    Session *s = static_cast<Session*>(con->get_priv());
    if (!s) {
      s = new Session(cct);
      con->set_priv(s->get());
      s->con = con;
      dout(10) << "new session (incoming)" << s << " con=" << con
          << " addr=" << con->get_peer_addr()
          << " must have raced with connect" << dendl;
      assert(con->get_peer_type() == CEPH_ENTITY_TYPE_OSD);
      s->entity_name.set_type(CEPH_ENTITY_TYPE_OSD);
    }
    s->put();
  }
}

bool OSD::ms_handle_reset(Connection *con)
{
  Session *session = static_cast<Session*>(con->get_priv());
  dout(2) << "ms_handle_reset con " << con << " session " << session << dendl;
  if (!session)
    return false;
  session->wstate.reset(con);
  session->con.reset(NULL);  // break con <-> session ref cycle
  // note that we break session->con *before* the session_handle_reset
  // cleanup below.  this avoids a race between us and
  // PG::add_backoff, Session::check_backoff, etc.
  session_handle_reset(session);
  session->put();
  return true;
}

bool OSD::ms_handle_refused(Connection *con)
{
  if (!cct->_conf->osd_fast_fail_on_connection_refused)
    return false;

  Session *session = static_cast<Session*>(con->get_priv());
  dout(2) << "ms_handle_refused con " << con << " session " << session << dendl;
  if (!session)
    return false;
  int type = con->get_peer_type();
  // handle only OSD failures here
  if (monc && (type == CEPH_ENTITY_TYPE_OSD)) {
    OSDMapRef osdmap = get_osdmap();
    if (osdmap) {
      int id = osdmap->identify_osd_on_all_channels(con->get_peer_addr());
      if (id >= 0 && osdmap->is_up(id)) {
        // I'm cheating mon heartbeat grace logic, because we know it's not going
        // to respawn alone. +1 so we won't hit any boundary case.
        monc->send_mon_message(new MOSDFailure(monc->get_fsid(),
                                                  osdmap->get_inst(id),
                                                  cct->_conf->osd_heartbeat_grace + 1,
                                                  osdmap->get_epoch(),
                                                  MOSDFailure::FLAG_IMMEDIATE | MOSDFailure::FLAG_FAILED
                                                  ));
      }
    }
  }
  session->put();
  return true;
}

struct C_OSD_GetVersion : public Context {
  OSD *osd;
  uint64_t oldest, newest;
  explicit C_OSD_GetVersion(OSD *o) : osd(o), oldest(0), newest(0) {}
  void finish(int r) override {
    if (r >= 0)
      osd->_got_mon_epochs(oldest, newest);
  }
};

void OSD::start_boot()
{
  if (!_is_healthy()) {
    // if we are not healthy, do not mark ourselves up (yet)
    dout(1) << "not healthy; waiting to boot" << dendl;
    if (!is_waiting_for_healthy())
      start_waiting_for_healthy();
    // send pings sooner rather than later
    heartbeat_kick();
    return;
  }
  dout(1) << __func__ << dendl;
  set_state(STATE_PREBOOT);
  waiting_for_luminous_mons = false;
  dout(10) << "start_boot - have maps " << superblock.oldest_map
           << ".." << superblock.newest_map << dendl;
  C_OSD_GetVersion *c = new C_OSD_GetVersion(this);
  monc->get_version("osdmap", &c->newest, &c->oldest, c);
}

void OSD::_got_mon_epochs(epoch_t oldest, epoch_t newest)
{
  Mutex::Locker l(osd_lock);
  if (is_preboot()) {
    _preboot(oldest, newest);
  }
}

void OSD::_preboot(epoch_t oldest, epoch_t newest)
{
  assert(is_preboot());
  dout(10) << __func__ << " _preboot mon has osdmaps "
           << oldest << ".." << newest << dendl;

  // ensure our local fullness awareness is accurate
  heartbeat();

  // if our map within recent history, try to add ourselves to the osdmap.
  if (osdmap->get_epoch() == 0) {
    derr << "waiting for initial osdmap" << dendl;
  } else if (osdmap->test_flag(CEPH_OSDMAP_NOUP) || osdmap->is_noup(whoami)) {
    derr << "osdmap NOUP flag is set, waiting for it to clear" << dendl;
  } else if (!osdmap->test_flag(CEPH_OSDMAP_SORTBITWISE)) {
    derr << "osdmap SORTBITWISE OSDMap flag is NOT set; please set it"
         << dendl;
  } else if (osdmap->require_osd_release < CEPH_RELEASE_JEWEL) {
    derr << "osdmap REQUIRE_JEWEL OSDMap flag is NOT set; please set it"
         << dendl;
  } else if (!monc->monmap.get_required_features().contains_all(
               ceph::features::mon::FEATURE_LUMINOUS)) {
    derr << "monmap REQUIRE_LUMINOUS is NOT set; must upgrade all monitors to "
         << "Luminous or later before Luminous OSDs will boot" << dendl;
    waiting_for_luminous_mons = true;
  } else if (service.need_fullness_update()) {
    derr << "osdmap fullness state needs update" << dendl;
    send_full_update();
  } else if (osdmap->get_epoch() >= oldest - 1 &&
             osdmap->get_epoch() + cct->_conf->osd_map_message_max > newest) {
    _send_boot();
    return;
  }

  // get all the latest maps
  if (osdmap->get_epoch() + 1 >= oldest)
    osdmap_subscribe(osdmap->get_epoch() + 1, false);
  else
    osdmap_subscribe(oldest - 1, true);
}

void OSD::send_full_update()
{
  if (!service.need_fullness_update())
    return;
  unsigned state = 0;
  if (service.is_full()) {
    state = CEPH_OSD_FULL;
  } else if (service.is_backfillfull()) {
    state = CEPH_OSD_BACKFILLFULL;
  } else if (service.is_nearfull()) {
    state = CEPH_OSD_NEARFULL;
  }
  set<string> s;
  OSDMap::calc_state_set(state, s);
  dout(10) << __func__ << " want state " << s << dendl;
  monc->send_mon_message(new MOSDFull(osdmap->get_epoch(), state));
}

void OSD::start_waiting_for_healthy()
{
  dout(1) << "start_waiting_for_healthy" << dendl;
  set_state(STATE_WAITING_FOR_HEALTHY);
  last_heartbeat_resample = utime_t();
}

bool OSD::_is_healthy()
{
  if (!cct->get_heartbeat_map()->is_healthy()) {
    dout(1) << "is_healthy false -- internal heartbeat failed" << dendl;
    return false;
  }

  if (is_waiting_for_healthy()) {
    Mutex::Locker l(heartbeat_lock);
    utime_t cutoff = ceph_clock_now();
    cutoff -= cct->_conf->osd_heartbeat_grace;
    int num = 0, up = 0;
    for (map<int,HeartbeatInfo>::iterator p = heartbeat_peers.begin();
         p != heartbeat_peers.end();
         ++p) {
      if (p->second.is_healthy(cutoff))
        ++up;
      ++num;
    }
    if ((float)up < (float)num * cct->_conf->osd_heartbeat_min_healthy_ratio) {
      dout(1) << "is_healthy false -- only " << up << "/" << num << " up peers (less than "
              << int(cct->_conf->osd_heartbeat_min_healthy_ratio * 100.0) << "%)" << dendl;
      return false;
    }
  }

  return true;
}

void OSD::_send_boot()
{
  dout(10) << "_send_boot" << dendl;
  entity_addr_t cluster_addr = cluster_messenger->get_myaddr();
  Connection *local_connection = cluster_messenger->get_loopback_connection().get();
  if (cluster_addr.is_blank_ip()) {
    int port = cluster_addr.get_port();
    cluster_addr = client_messenger->get_myaddr();
    cluster_addr.set_port(port);
    cluster_messenger->set_addr_unknowns(cluster_addr);
    dout(10) << " assuming cluster_addr ip matches client_addr" << dendl;
  } else {
    Session *s = static_cast<Session*>(local_connection->get_priv());
    if (s)
      s->put();
    else
      cluster_messenger->ms_deliver_handle_fast_connect(local_connection);
  }

  entity_addr_t hb_back_addr = hb_back_server_messenger->get_myaddr();
  local_connection = hb_back_server_messenger->get_loopback_connection().get();
  if (hb_back_addr.is_blank_ip()) {
    int port = hb_back_addr.get_port();
    hb_back_addr = cluster_addr;
    hb_back_addr.set_port(port);
    hb_back_server_messenger->set_addr_unknowns(hb_back_addr);
    dout(10) << " assuming hb_back_addr ip matches cluster_addr" << dendl;
  } else {
    Session *s = static_cast<Session*>(local_connection->get_priv());
    if (s)
      s->put();
    else
      hb_back_server_messenger->ms_deliver_handle_fast_connect(local_connection);
  }

  entity_addr_t hb_front_addr = hb_front_server_messenger->get_myaddr();
  local_connection = hb_front_server_messenger->get_loopback_connection().get();
  if (hb_front_addr.is_blank_ip()) {
    int port = hb_front_addr.get_port();
    hb_front_addr = client_messenger->get_myaddr();
    hb_front_addr.set_port(port);
    hb_front_server_messenger->set_addr_unknowns(hb_front_addr);
    dout(10) << " assuming hb_front_addr ip matches client_addr" << dendl;
  } else {
    Session *s = static_cast<Session*>(local_connection->get_priv());
    if (s)
      s->put();
    else
      hb_front_server_messenger->ms_deliver_handle_fast_connect(local_connection);
  }

  MOSDBoot *mboot = new MOSDBoot(superblock, get_osdmap_epoch(), service.get_boot_epoch(),
                                 hb_back_addr, hb_front_addr, cluster_addr,
                                 CEPH_FEATURES_ALL);
  dout(10) << " client_addr " << client_messenger->get_myaddr()
           << ", cluster_addr " << cluster_addr
           << ", hb_back_addr " << hb_back_addr
           << ", hb_front_addr " << hb_front_addr
           << dendl;
  _collect_metadata(&mboot->metadata);
  monc->send_mon_message(mboot);
  set_state(STATE_BOOTING);
}

void OSD::_collect_metadata(map<string,string> *pm)
{
  // config info
  (*pm)["osd_data"] = dev_path;
  (*pm)["osd_journal"] = journal_path;
  (*pm)["front_addr"] = stringify(client_messenger->get_myaddr());
  (*pm)["back_addr"] = stringify(cluster_messenger->get_myaddr());
  (*pm)["hb_front_addr"] = stringify(hb_front_server_messenger->get_myaddr());
  (*pm)["hb_back_addr"] = stringify(hb_back_server_messenger->get_myaddr());

  // backend
  (*pm)["osd_objectstore"] = store->get_type();
  (*pm)["rotational"] = store_is_rotational ? "1" : "0";
  store->collect_metadata(pm);

  collect_sys_info(pm, cct);

  dout(10) << __func__ << " " << *pm << dendl;
}

void OSD::queue_want_up_thru(epoch_t want)
{
  map_lock.get_read();
  epoch_t cur = osdmap->get_up_thru(whoami);
  Mutex::Locker l(mon_report_lock);
  if (want > up_thru_wanted) {
    dout(10) << "queue_want_up_thru now " << want << " (was " << up_thru_wanted << ")"
             << ", currently " << cur
             << dendl;
    up_thru_wanted = want;
    send_alive();
  } else {
    dout(10) << "queue_want_up_thru want " << want << " <= queued " << up_thru_wanted
             << ", currently " << cur
             << dendl;
  }
  map_lock.put_read();
}

void OSD::send_alive()
{
  assert(mon_report_lock.is_locked());
  if (!osdmap->exists(whoami))
    return;
  epoch_t up_thru = osdmap->get_up_thru(whoami);
  dout(10) << "send_alive up_thru currently " << up_thru << " want " << up_thru_wanted << dendl;
  if (up_thru_wanted > up_thru) {
    dout(10) << "send_alive want " << up_thru_wanted << dendl;
    monc->send_mon_message(new MOSDAlive(osdmap->get_epoch(), up_thru_wanted));
  }
}

void OSD::request_full_map(epoch_t first, epoch_t last)
{
  dout(10) << __func__ << " " << first << ".." << last
           << ", previously requested "
           << requested_full_first << ".." << requested_full_last << dendl;
  assert(osd_lock.is_locked());
  assert(first > 0 && last > 0);
  assert(first <= last);
  assert(first >= requested_full_first);  // we shouldn't ever ask for older maps
  if (requested_full_first == 0) {
    // first request
    requested_full_first = first;
    requested_full_last = last;
  } else if (last <= requested_full_last) {
    // dup
    return;
  } else {
    // additional request
    first = requested_full_last + 1;
    requested_full_last = last;
  }
  MMonGetOSDMap *req = new MMonGetOSDMap;
  req->request_full(first, last);
  monc->send_mon_message(req);
}

void OSD::got_full_map(epoch_t e)
{
  assert(requested_full_first <= requested_full_last);
  assert(osd_lock.is_locked());
  if (requested_full_first == 0) {
    dout(20) << __func__ << " " << e << ", nothing requested" << dendl;
    return;
  }
  if (e < requested_full_first) {
    dout(10) << __func__ << " " << e << ", requested " << requested_full_first
             << ".." << requested_full_last
             << ", ignoring" << dendl;
    return;
  }
  if (e >= requested_full_last) {
    dout(10) << __func__ << " " << e << ", requested " << requested_full_first
             << ".." << requested_full_last << ", resetting" << dendl;
    requested_full_first = requested_full_last = 0;
    return;
  }
  
  requested_full_first = e + 1;

  dout(10) << __func__ << " " << e << ", requested " << requested_full_first
           << ".." << requested_full_last
           << ", still need more" << dendl;
}

void OSD::requeue_failures()
{
  Mutex::Locker l(heartbeat_lock);
  unsigned old_queue = failure_queue.size();
  unsigned old_pending = failure_pending.size();
  for (map<int,pair<utime_t,entity_inst_t> >::iterator p =
         failure_pending.begin();
       p != failure_pending.end(); ) {
    failure_queue[p->first] = p->second.first;
    failure_pending.erase(p++);
  }
  dout(10) << __func__ << " " << old_queue << " + " << old_pending << " -> "
           << failure_queue.size() << dendl;
}

void OSD::send_failures()
{
  assert(map_lock.is_locked());
  assert(mon_report_lock.is_locked());
  Mutex::Locker l(heartbeat_lock);
  utime_t now = ceph_clock_now();
  while (!failure_queue.empty()) {
    int osd = failure_queue.begin()->first;
    if (!failure_pending.count(osd)) {
      entity_inst_t i = osdmap->get_inst(osd);
      int failed_for = (int)(double)(now - failure_queue.begin()->second);
      monc->send_mon_message(new MOSDFailure(monc->get_fsid(), i, failed_for,
                                             osdmap->get_epoch()));
      failure_pending[osd] = make_pair(failure_queue.begin()->second, i);
    }
    failure_queue.erase(osd);
  }
}

void OSD::send_still_alive(epoch_t epoch, const entity_inst_t &i)
{
  MOSDFailure *m = new MOSDFailure(monc->get_fsid(), i, 0, epoch, MOSDFailure::FLAG_ALIVE);
  monc->send_mon_message(m);
}

void OSD::send_pg_stats(const utime_t &now)
{
  assert(map_lock.is_locked());
  assert(osdmap->require_osd_release < CEPH_RELEASE_LUMINOUS);
  dout(20) << "send_pg_stats" << dendl;

  osd_stat_t cur_stat = service.get_osd_stat();

  cur_stat.os_perf_stat = store->get_cur_stats();

  pg_stat_queue_lock.Lock();

  if (osd_stat_updated || !pg_stat_queue.empty()) {
    last_pg_stats_sent = now;
    osd_stat_updated = false;

    dout(10) << "send_pg_stats - " << pg_stat_queue.size() << " pgs updated" << dendl;

    utime_t had_for(now);
    had_for -= had_map_since;

    MPGStats *m = new MPGStats(monc->get_fsid(), osdmap->get_epoch(), had_for);

    uint64_t tid = ++pg_stat_tid;
    m->set_tid(tid);
    m->osd_stat = cur_stat;

    xlist<PG*>::iterator p = pg_stat_queue.begin();
    while (!p.end()) {
      PG *pg = *p;
      ++p;
      if (!pg->is_primary()) {  // we hold map_lock; role is stable.
        pg->stat_queue_item.remove_myself();
        pg->put("pg_stat_queue");
        continue;
      }
      pg->pg_stats_publish_lock.Lock();
      if (pg->pg_stats_publish_valid) {
        m->pg_stat[pg->info.pgid.pgid] = pg->pg_stats_publish;
        dout(25) << " sending " << pg->info.pgid << " " << pg->pg_stats_publish.reported_epoch << ":"
                 << pg->pg_stats_publish.reported_seq << dendl;
      } else {
        dout(25) << " NOT sending " << pg->info.pgid << " " << pg->pg_stats_publish.reported_epoch << ":"
                 << pg->pg_stats_publish.reported_seq << ", not valid" << dendl;
      }
      pg->pg_stats_publish_lock.Unlock();
    }

    if (last_pg_stats_ack == utime_t() || !outstanding_pg_stats.empty()) {
      last_pg_stats_ack = ceph_clock_now();
    }
    outstanding_pg_stats.insert(tid);
    dout(20) << __func__ << "  updates pending: " << outstanding_pg_stats << dendl;

    monc->send_mon_message(m);
  }

  pg_stat_queue_lock.Unlock();
}

void OSD::handle_pg_stats_ack(MPGStatsAck *ack)
{
  dout(10) << "handle_pg_stats_ack " << dendl;

  if (!require_mon_peer(ack)) {
    ack->put();
    return;
  }

  // NOTE: we may get replies from a previous mon even while
  // outstanding_pg_stats is empty if reconnecting races with replies
  // in flight.

  pg_stat_queue_lock.Lock();

  last_pg_stats_ack = ceph_clock_now();

  // decay timeout slowly (analogous to TCP)
  stats_ack_timeout =
    MAX(cct->_conf->osd_mon_ack_timeout,
        stats_ack_timeout * cct->_conf->osd_stats_ack_timeout_decay);
  dout(20) << __func__ << "  timeout now " << stats_ack_timeout << dendl;

  if (ack->get_tid() > pg_stat_tid_flushed) {
    pg_stat_tid_flushed = ack->get_tid();
    pg_stat_queue_cond.Signal();
  }

  xlist<PG*>::iterator p = pg_stat_queue.begin();
  while (!p.end()) {
    PG *pg = *p;
    PGRef _pg(pg);
    ++p;

    auto acked = ack->pg_stat.find(pg->info.pgid.pgid);
    if (acked != ack->pg_stat.end()) {
      pg->pg_stats_publish_lock.Lock();
      if (acked->second.first == pg->pg_stats_publish.reported_seq &&
          acked->second.second == pg->pg_stats_publish.reported_epoch) {
        dout(25) << " ack on " << pg->info.pgid << " " << pg->pg_stats_publish.reported_epoch
                 << ":" << pg->pg_stats_publish.reported_seq << dendl;
        pg->stat_queue_item.remove_myself();
        pg->put("pg_stat_queue");
      } else {
        dout(25) << " still pending " << pg->info.pgid << " " << pg->pg_stats_publish.reported_epoch
                 << ":" << pg->pg_stats_publish.reported_seq << " > acked "
                 << acked->second << dendl;
      }
      pg->pg_stats_publish_lock.Unlock();
    } else {
      dout(30) << " still pending " << pg->info.pgid << " " << pg->pg_stats_publish.reported_epoch
               << ":" << pg->pg_stats_publish.reported_seq << dendl;
    }
  }

  outstanding_pg_stats.erase(ack->get_tid());
  dout(20) << __func__ << "  still pending: " << outstanding_pg_stats << dendl;

  pg_stat_queue_lock.Unlock();

  ack->put();
}

void OSD::flush_pg_stats()
{
  dout(10) << "flush_pg_stats" << dendl;
  osd_lock.Unlock();
  utime_t now = ceph_clock_now();
  map_lock.get_read();
  mon_report_lock.Lock();
  send_pg_stats(now);
  mon_report_lock.Unlock();
  map_lock.put_read();


  pg_stat_queue_lock.Lock();
  uint64_t tid = pg_stat_tid;
  dout(10) << "flush_pg_stats waiting for stats tid " << tid << " to flush" << dendl;
  while (tid > pg_stat_tid_flushed)
    pg_stat_queue_cond.Wait(pg_stat_queue_lock);
  dout(10) << "flush_pg_stats finished waiting for stats tid " << tid << " to flush" << dendl;
  pg_stat_queue_lock.Unlock();

  osd_lock.Lock();
}

void OSD::send_beacon(const ceph::coarse_mono_clock::time_point& now)
{
  const auto& monmap = monc->monmap;
  // send beacon to mon even if we are just connected, and the monmap is not
  // initialized yet by then.
  if (monmap.epoch > 0 &&
      monmap.get_required_features().contains_all(
        ceph::features::mon::FEATURE_LUMINOUS)) {
    dout(20) << __func__ << " sending" << dendl;
    MOSDBeacon* beacon = nullptr;
    {
      Mutex::Locker l{min_last_epoch_clean_lock};
      beacon = new MOSDBeacon(osdmap->get_epoch(), min_last_epoch_clean);
      std::swap(beacon->pgs, min_last_epoch_clean_pgs);
      last_sent_beacon = now;
    }
    monc->send_mon_message(beacon);
  } else {
    dout(20) << __func__ << " not sending" << dendl;
  }
}

void OSD::handle_command(MMonCommand *m)
{
  if (!require_mon_peer(m)) {
    m->put();
    return;
  }

  Command *c = new Command(m->cmd, m->get_tid(), m->get_data(), NULL);
  command_wq.queue(c);
  m->put();
}

void OSD::handle_command(MCommand *m)
{
  ConnectionRef con = m->get_connection();
  Session *session = static_cast<Session *>(con->get_priv());
  if (!session) {
    con->send_message(new MCommandReply(m, -EPERM));
    m->put();
    return;
  }

  OSDCap& caps = session->caps;
  session->put();

  if (!caps.allow_all() || m->get_source().is_mon()) {
    con->send_message(new MCommandReply(m, -EPERM));
    m->put();
    return;
  }

  Command *c = new Command(m->cmd, m->get_tid(), m->get_data(), con.get());
  command_wq.queue(c);

  m->put();
}

struct OSDCommand {
  string cmdstring;
  string helpstring;
  string module;
  string perm;
  string availability;
} osd_commands[] = {

#define COMMAND(parsesig, helptext, module, perm, availability) \
  {parsesig, helptext, module, perm, availability},

// yes, these are really pg commands, but there's a limit to how
// much work it's worth.  The OSD returns all of them.  Make this
// form (pg <pgid> <cmd>) valid only for the cli.
// Rest uses "tell <pgid> <cmd>"

COMMAND("pg " \
        "name=pgid,type=CephPgid " \
        "name=cmd,type=CephChoices,strings=query", \
        "show details of a specific pg", "osd", "r", "cli")
COMMAND("pg " \
        "name=pgid,type=CephPgid " \
        "name=cmd,type=CephChoices,strings=mark_unfound_lost " \
        "name=mulcmd,type=CephChoices,strings=revert|delete", \
        "mark all unfound objects in this pg as lost, either removing or reverting to a prior version if one is available",
        "osd", "rw", "cli")
COMMAND("pg " \
        "name=pgid,type=CephPgid " \
        "name=cmd,type=CephChoices,strings=list_missing " \
        "name=offset,type=CephString,req=false",
        "list missing objects on this pg, perhaps starting at an offset given in JSON",
        "osd", "r", "cli")

// new form: tell <pgid> <cmd> for both cli and rest

COMMAND("query",
        "show details of a specific pg", "osd", "r", "cli,rest")
COMMAND("mark_unfound_lost " \
        "name=mulcmd,type=CephChoices,strings=revert|delete", \
        "mark all unfound objects in this pg as lost, either removing or reverting to a prior version if one is available",
        "osd", "rw", "cli,rest")
COMMAND("list_missing " \
        "name=offset,type=CephString,req=false",
        "list missing objects on this pg, perhaps starting at an offset given in JSON",
        "osd", "r", "cli,rest")
COMMAND("perf histogram dump "
        "name=logger,type=CephString,req=false "
        "name=counter,type=CephString,req=false",
        "Get histogram data",
        "osd", "r", "cli,rest")

// tell <osd.n> commands.  Validation of osd.n must be special-cased in client
COMMAND("version", "report version of OSD", "osd", "r", "cli,rest")
COMMAND("get_command_descriptions", "list commands descriptions", "osd", "r", "cli,rest")
COMMAND("injectargs " \
        "name=injected_args,type=CephString,n=N",
        "inject configuration arguments into running OSD",
        "osd", "rw", "cli,rest")
COMMAND("cluster_log " \
        "name=level,type=CephChoices,strings=error,warning,info,debug " \
        "name=message,type=CephString,n=N",
        "log a message to the cluster log",
        "osd", "rw", "cli,rest")
COMMAND("bench " \
        "name=count,type=CephInt,req=false " \
        "name=size,type=CephInt,req=false " \
        "name=object_size,type=CephInt,req=false " \
        "name=object_num,type=CephInt,req=false ", \
        "OSD benchmark: write <count> <size>-byte objects, " \
        "(default 1G size 4MB). Results in log.",
        "osd", "rw", "cli,rest")
COMMAND("flush_pg_stats", "flush pg stats", "osd", "rw", "cli,rest")
COMMAND("heap " \
        "name=heapcmd,type=CephChoices,strings=dump|start_profiler|stop_profiler|release|stats", \
        "show heap usage info (available only if compiled with tcmalloc)", \
        "osd", "rw", "cli,rest")
COMMAND("debug dump_missing " \
        "name=filename,type=CephFilepath",
        "dump missing objects to a named file", "osd", "r", "cli,rest")
COMMAND("debug kick_recovery_wq " \
        "name=delay,type=CephInt,range=0",
        "set osd_recovery_delay_start to <val>", "osd", "rw", "cli,rest")
COMMAND("cpu_profiler " \
        "name=arg,type=CephChoices,strings=status|flush",
        "run cpu profiling on daemon", "osd", "rw", "cli,rest")
COMMAND("dump_pg_recovery_stats", "dump pg recovery statistics",
        "osd", "r", "cli,rest")
COMMAND("reset_pg_recovery_stats", "reset pg recovery statistics",
        "osd", "rw", "cli,rest")
COMMAND("compact",
        "compact object store's omap. "
        "WARNING: Compaction probably slows your requests",
        "osd", "rw", "cli,rest")
};

void OSD::do_command(Connection *con, ceph_tid_t tid, vector<string>& cmd, bufferlist& data)
{
  int r = 0;
  stringstream ss, ds;
  string rs;
  bufferlist odata;

  dout(20) << "do_command tid " << tid << " " << cmd << dendl;

  map<string, cmd_vartype> cmdmap;
  string prefix;
  string format;
  string pgidstr;
  boost::scoped_ptr<Formatter> f;

  if (cmd.empty()) {
    ss << "no command given";
    goto out;
  }

  if (!cmdmap_from_json(cmd, &cmdmap, ss)) {
    r = -EINVAL;
    goto out;
  }

  cmd_getval(cct, cmdmap, "prefix", prefix);

  if (prefix == "get_command_descriptions") {
    int cmdnum = 0;
    JSONFormatter *f = new JSONFormatter();
    f->open_object_section("command_descriptions");
    for (OSDCommand *cp = osd_commands;
         cp < &osd_commands[ARRAY_SIZE(osd_commands)]; cp++) {

      ostringstream secname;
      secname << "cmd" << setfill('0') << std::setw(3) << cmdnum;
      dump_cmddesc_to_json(f, secname.str(), cp->cmdstring, cp->helpstring,
                           cp->module, cp->perm, cp->availability, 0);
      cmdnum++;
    }
    f->close_section(); // command_descriptions

    f->flush(ds);
    delete f;
    goto out;
  }

  cmd_getval(cct, cmdmap, "format", format);
  f.reset(Formatter::create(format));

  if (prefix == "version") {
    if (f) {
      f->open_object_section("version");
      f->dump_string("version", pretty_version_to_str());
      f->close_section();
      f->flush(ds);
    } else {
      ds << pretty_version_to_str();
    }
    goto out;
  }
  else if (prefix == "injectargs") {
    vector<string> argsvec;
    cmd_getval(cct, cmdmap, "injected_args", argsvec);

    if (argsvec.empty()) {
      r = -EINVAL;
      ss << "ignoring empty injectargs";
      goto out;
    }
    string args = argsvec.front();
    for (vector<string>::iterator a = ++argsvec.begin(); a != argsvec.end(); ++a)
      args += " " + *a;
    osd_lock.Unlock();
    r = cct->_conf->injectargs(args, &ss);
    osd_lock.Lock();
  }
  else if (prefix == "cluster_log") {
    vector<string> msg;
    cmd_getval(cct, cmdmap, "message", msg);
    if (msg.empty()) {
      r = -EINVAL;
      ss << "ignoring empty log message";
      goto out;
    }
    string message = msg.front();
    for (vector<string>::iterator a = ++msg.begin(); a != msg.end(); ++a)
      message += " " + *a;
    string lvl;
    cmd_getval(cct, cmdmap, "level", lvl);
    clog_type level = string_to_clog_type(lvl);
    if (level < 0) {
      r = -EINVAL;
      ss << "unknown level '" << lvl << "'";
      goto out;
    }
    clog->do_log(level, message);
  }

  // either 'pg <pgid> <command>' or
  // 'tell <pgid>' (which comes in without any of that prefix)?

  else if (prefix == "pg" ||
            prefix == "query" ||
            prefix == "mark_unfound_lost" ||
            prefix == "list_missing"
           ) {
    pg_t pgid;

    if (!cmd_getval(cct, cmdmap, "pgid", pgidstr)) {
      ss << "no pgid specified";
      r = -EINVAL;
    } else if (!pgid.parse(pgidstr.c_str())) {
      ss << "couldn't parse pgid '" << pgidstr << "'";
      r = -EINVAL;
    } else {
      spg_t pcand;
      PG *pg = nullptr;
      if (osdmap->get_primary_shard(pgid, &pcand) &&
          (pg = _lookup_lock_pg(pcand))) {
        if (pg->is_primary()) {
          // simulate pg <pgid> cmd= for pg->do-command
          if (prefix != "pg")
            cmd_putval(cct, cmdmap, "cmd", prefix);
          r = pg->do_command(cmdmap, ss, data, odata, con, tid);
          if (r == -EAGAIN) {
            pg->unlock();
            // don't reply, pg will do so async
            return;
          }
        } else {
          ss << "not primary for pgid " << pgid;

          // send them the latest diff to ensure they realize the mapping
          // has changed.
          service.send_incremental_map(osdmap->get_epoch() - 1, con, osdmap);

          // do not reply; they will get newer maps and realize they
          // need to resend.
          pg->unlock();
          return;
        }
        pg->unlock();
      } else {
        ss << "i don't have pgid " << pgid;
        r = -ENOENT;
      }
    }
  }

  else if (prefix == "bench") {
    int64_t count;
    int64_t bsize;
    int64_t osize, onum;
    // default count 1G, size 4MB
    cmd_getval(cct, cmdmap, "count", count, (int64_t)1 << 30);
    cmd_getval(cct, cmdmap, "size", bsize, (int64_t)4 << 20);
    cmd_getval(cct, cmdmap, "object_size", osize, (int64_t)0);
    cmd_getval(cct, cmdmap, "object_num", onum, (int64_t)0);

    ceph::shared_ptr<ObjectStore::Sequencer> osr (std::make_shared<
                                        ObjectStore::Sequencer>("bench"));

    uint32_t duration = cct->_conf->osd_bench_duration;

    if (bsize > (int64_t) cct->_conf->osd_bench_max_block_size) {
      // let us limit the block size because the next checks rely on it
      // having a sane value.  If we allow any block size to be set things
      // can still go sideways.
      ss << "block 'size' values are capped at "
         << prettybyte_t(cct->_conf->osd_bench_max_block_size) << ". If you wish to use"
         << " a higher value, please adjust 'osd_bench_max_block_size'";
      r = -EINVAL;
      goto out;
    } else if (bsize < (int64_t) (1 << 20)) {
      // entering the realm of small block sizes.
      // limit the count to a sane value, assuming a configurable amount of
      // IOPS and duration, so that the OSD doesn't get hung up on this,
      // preventing timeouts from going off
      int64_t max_count =
        bsize * duration * cct->_conf->osd_bench_small_size_max_iops;
      if (count > max_count) {
        ss << "'count' values greater than " << max_count
           << " for a block size of " << prettybyte_t(bsize) << ", assuming "
           << cct->_conf->osd_bench_small_size_max_iops << " IOPS,"
           << " for " << duration << " seconds,"
           << " can cause ill effects on osd. "
           << " Please adjust 'osd_bench_small_size_max_iops' with a higher"
           << " value if you wish to use a higher 'count'.";
        r = -EINVAL;
        goto out;
      }
    } else {
      // 1MB block sizes are big enough so that we get more stuff done.
      // However, to avoid the osd from getting hung on this and having
      // timers being triggered, we are going to limit the count assuming
      // a configurable throughput and duration.
      // NOTE: max_count is the total amount of bytes that we believe we
      //       will be able to write during 'duration' for the given
      //       throughput.  The block size hardly impacts this unless it's
      //       way too big.  Given we already check how big the block size
      //       is, it's safe to assume everything will check out.
      int64_t max_count =
        cct->_conf->osd_bench_large_size_max_throughput * duration;
      if (count > max_count) {
        ss << "'count' values greater than " << max_count
           << " for a block size of " << prettybyte_t(bsize) << ", assuming "
           << prettybyte_t(cct->_conf->osd_bench_large_size_max_throughput) << "/s,"
           << " for " << duration << " seconds,"
           << " can cause ill effects on osd. "
           << " Please adjust 'osd_bench_large_size_max_throughput'"
           << " with a higher value if you wish to use a higher 'count'.";
        r = -EINVAL;
        goto out;
      }
    }

    if (osize && bsize > osize)
      bsize = osize;

    dout(1) << " bench count " << count
            << " bsize " << prettybyte_t(bsize) << dendl;

    ObjectStore::Transaction cleanupt;

    if (osize && onum) {
      bufferlist bl;
      bufferptr bp(osize);
      bp.zero();
      bl.push_back(std::move(bp));
      bl.rebuild_page_aligned();
      for (int i=0; i<onum; ++i) {
        char nm[30];
        snprintf(nm, sizeof(nm), "disk_bw_test_%d", i);
        object_t oid(nm);
        hobject_t soid(sobject_t(oid, 0));
        ObjectStore::Transaction t;
        t.write(coll_t(), ghobject_t(soid), 0, osize, bl);
        store->queue_transaction(osr.get(), std::move(t), NULL);
        cleanupt.remove(coll_t(), ghobject_t(soid));
      }
    }

    bufferlist bl;
    bufferptr bp(bsize);
    bp.zero();
    bl.push_back(std::move(bp));
    bl.rebuild_page_aligned();

    {
      C_SaferCond waiter;
      if (!osr->flush_commit(&waiter)) {
        waiter.wait();
      }
    }

    utime_t start = ceph_clock_now();
    for (int64_t pos = 0; pos < count; pos += bsize) {
      char nm[30];
      unsigned offset = 0;
      if (onum && osize) {
        snprintf(nm, sizeof(nm), "disk_bw_test_%d", (int)(rand() % onum));
        offset = rand() % (osize / bsize) * bsize;
      } else {
        snprintf(nm, sizeof(nm), "disk_bw_test_%lld", (long long)pos);
      }
      object_t oid(nm);
      hobject_t soid(sobject_t(oid, 0));
      ObjectStore::Transaction t;
      t.write(coll_t::meta(), ghobject_t(soid), offset, bsize, bl);
      store->queue_transaction(osr.get(), std::move(t), NULL);
      if (!onum || !osize)
        cleanupt.remove(coll_t::meta(), ghobject_t(soid));
    }

    {
      C_SaferCond waiter;
      if (!osr->flush_commit(&waiter)) {
        waiter.wait();
      }
    }
    utime_t end = ceph_clock_now();

    // clean up
    store->queue_transaction(osr.get(), std::move(cleanupt), NULL);
    {
      C_SaferCond waiter;
      if (!osr->flush_commit(&waiter)) {
        waiter.wait();
      }
    }

    uint64_t rate = (double)count / (end - start);
    if (f) {
      f->open_object_section("osd_bench_results");
      f->dump_int("bytes_written", count);
      f->dump_int("blocksize", bsize);
      f->dump_unsigned("bytes_per_sec", rate);
      f->close_section();
      f->flush(ss);
    } else {
      ss << "bench: wrote " << prettybyte_t(count)
         << " in blocks of " << prettybyte_t(bsize) << " in "
         << (end-start) << " sec at " << prettybyte_t(rate) << "/sec";
    }
  }

  else if (prefix == "flush_pg_stats") {
    if (osdmap->require_osd_release >= CEPH_RELEASE_LUMINOUS) {
      mgrc.send_pgstats();
      ds << service.get_osd_stat_seq() << "\n";
    } else {
      flush_pg_stats();
    }
  }

  else if (prefix == "heap") {
    r = ceph::osd_cmds::heap(*cct, cmdmap, *f, ds);
  }

  else if (prefix == "debug dump_missing") {
    string file_name;
    cmd_getval(cct, cmdmap, "filename", file_name);
    std::ofstream fout(file_name.c_str());
    if (!fout.is_open()) {
        ss << "failed to open file '" << file_name << "'";
        r = -EINVAL;
        goto out;
    }

    fout << "*** osd " << whoami << ": dump_missing ***" << std::endl;
    RWLock::RLocker l(pg_map_lock);
    for (ceph::unordered_map<spg_t, PG*>::const_iterator pg_map_e = pg_map.begin();
         pg_map_e != pg_map.end(); ++pg_map_e) {
      PG *pg = pg_map_e->second;
      pg->lock();

      fout << *pg << std::endl;
      std::map<hobject_t, pg_missing_item>::const_iterator mend =
        pg->pg_log.get_missing().get_items().end();
      std::map<hobject_t, pg_missing_item>::const_iterator mi =
        pg->pg_log.get_missing().get_items().begin();
      for (; mi != mend; ++mi) {
        fout << mi->first << " -> " << mi->second << std::endl;
        if (!pg->missing_loc.needs_recovery(mi->first))
          continue;
        if (pg->missing_loc.is_unfound(mi->first))
          fout << " unfound ";
        const set<pg_shard_t> &mls(pg->missing_loc.get_locations(mi->first));
        if (mls.empty())
          continue;
        fout << "missing_loc: " << mls << std::endl;
      }
      pg->unlock();
      fout << std::endl;
    }

    fout.close();
  }
  else if (prefix == "debug kick_recovery_wq") {
    int64_t delay;
    cmd_getval(cct, cmdmap, "delay", delay);
    ostringstream oss;
    oss << delay;
    r = cct->_conf->set_val("osd_recovery_delay_start", oss.str().c_str());
    if (r != 0) {
      ss << "kick_recovery_wq: error setting "
         << "osd_recovery_delay_start to '" << delay << "': error "
         << r;
      goto out;
    }
    cct->_conf->apply_changes(NULL);
    ss << "kicking recovery queue. set osd_recovery_delay_start "
       << "to " << cct->_conf->osd_recovery_delay_start;
  }

  else if (prefix == "cpu_profiler") {
    string arg;
    cmd_getval(cct, cmdmap, "arg", arg);
    vector<string> argvec;
    get_str_vec(arg, argvec);
    cpu_profiler_handle_command(argvec, ds);
  }

  else if (prefix == "dump_pg_recovery_stats") {
    stringstream s;
    if (f) {
      pg_recovery_stats.dump_formatted(f.get());
      f->flush(ds);
    } else {
      pg_recovery_stats.dump(s);
      ds << "dump pg recovery stats: " << s.str();
    }
  }

  else if (prefix == "reset_pg_recovery_stats") {
    ss << "reset pg recovery stats";
    pg_recovery_stats.reset();
  }

  else if (prefix == "perf histogram dump") {
    std::string logger;
    std::string counter;
    cmd_getval(cct, cmdmap, "logger", logger);
    cmd_getval(cct, cmdmap, "counter", counter);
    if (f) {
      cct->get_perfcounters_collection()->dump_formatted_histograms(
          f.get(), false, logger, counter);
      f->flush(ds);
    }
  }

  else if (prefix == "compact") {
    dout(1) << "triggering manual compaction" << dendl;
    auto start = ceph::coarse_mono_clock::now();
    store->compact();
    auto end = ceph::coarse_mono_clock::now();
    auto time_span = chrono::duration_cast<chrono::duration<double>>(end - start);
    dout(1) << "finished manual compaction in "
            << time_span.count()
            << " seconds" << dendl;
    ss << "compacted omap in " << time_span.count() << " seconds";
  }

  else {
    ss << "unrecognized command! " << cmd;
    r = -EINVAL;
  }

 out:
  rs = ss.str();
  odata.append(ds);
  dout(0) << "do_command r=" << r << " " << rs << dendl;
  clog->info() << rs;
  if (con) {
    MCommandReply *reply = new MCommandReply(r, rs);
    reply->set_tid(tid);
    reply->set_data(odata);
    con->send_message(reply);
  }
}

bool OSD::heartbeat_dispatch(Message *m)
{
  dout(30) << "heartbeat_dispatch " << m << dendl;
  switch (m->get_type()) {

  case CEPH_MSG_PING:
    dout(10) << "ping from " << m->get_source_inst() << dendl;
    m->put();
    break;

  case MSG_OSD_PING:
    handle_osd_ping(static_cast<MOSDPing*>(m));
    break;

  default:
    dout(0) << "dropping unexpected message " << *m << " from " << m->get_source_inst() << dendl;
    m->put();
  }

  return true;
}

bool OSD::ms_dispatch(Message *m)
{
  dout(20) << "OSD::ms_dispatch: " << *m << dendl;
  if (m->get_type() == MSG_OSD_MARK_ME_DOWN) {
    service.got_stop_ack();
    m->put();
    return true;
  }

  // lock!

  osd_lock.Lock();
  if (is_stopping()) {
    osd_lock.Unlock();
    m->put();
    return true;
  }

  do_waiters();
  _dispatch(m);

  osd_lock.Unlock();

  return true;
}

void OSD::maybe_share_map(
  Session *session,
  OpRequestRef op,
  OSDMapRef osdmap)
{
  if (!op->check_send_map) {
    return;
  }
  epoch_t last_sent_epoch = 0;

  session->sent_epoch_lock.lock();
  last_sent_epoch = session->last_sent_epoch;
  session->sent_epoch_lock.unlock();

  const Message *m = op->get_req();
  service.share_map(
    m->get_source(),
    m->get_connection().get(),
    op->sent_epoch,
    osdmap,
    session ? &last_sent_epoch : NULL);

  session->sent_epoch_lock.lock();
  if (session->last_sent_epoch < last_sent_epoch) {
    session->last_sent_epoch = last_sent_epoch;
  }
  session->sent_epoch_lock.unlock();

  op->check_send_map = false;
}

void OSD::dispatch_session_waiting(Session *session, OSDMapRef osdmap)
{
  assert(session->session_dispatch_lock.is_locked());

  auto i = session->waiting_on_map.begin();
  while (i != session->waiting_on_map.end()) {
    OpRequestRef op = &(*i);
    assert(ms_can_fast_dispatch(op->get_req()));
    const MOSDFastDispatchOp *m = static_cast<const MOSDFastDispatchOp*>(
      op->get_req());
    if (m->get_min_epoch() > osdmap->get_epoch()) {
      break;
    }
    session->waiting_on_map.erase(i++);
    op->put();

    spg_t pgid;
    if (m->get_type() == CEPH_MSG_OSD_OP) {
      pg_t actual_pgid = osdmap->raw_pg_to_pg(
        static_cast<const MOSDOp*>(m)->get_pg());
      if (!osdmap->get_primary_shard(actual_pgid, &pgid)) {
        continue;
      }
    } else {
      pgid = m->get_spg();
    }
    enqueue_op(pgid, op, m->get_map_epoch());
  }

  if (session->waiting_on_map.empty()) {
    clear_session_waiting_on_map(session);
  } else {
    register_session_waiting_on_map(session);
  }
}

void OSD::ms_fast_dispatch(Message *m)
{
  FUNCTRACE();
  if (service.is_stopping()) {
    m->put();
    return;
  }
  OpRequestRef op = op_tracker.create_request<OpRequest, Message*>(m);
  {
#ifdef WITH_LTTNG
    osd_reqid_t reqid = op->get_reqid();
#endif
    tracepoint(osd, ms_fast_dispatch, reqid.name._type,
        reqid.name._num, reqid.tid, reqid.inc);
  }

  if (m->trace)
    op->osd_trace.init("osd op", &trace_endpoint, &m->trace);

  // note sender epoch, min req'd epoch
  op->sent_epoch = static_cast<MOSDFastDispatchOp*>(m)->get_map_epoch();
  op->min_epoch = static_cast<MOSDFastDispatchOp*>(m)->get_min_epoch();
  assert(op->min_epoch <= op->sent_epoch); // sanity check!

  service.maybe_inject_dispatch_delay();

  if (m->get_connection()->has_features(CEPH_FEATUREMASK_RESEND_ON_SPLIT) ||
      m->get_type() != CEPH_MSG_OSD_OP) {
    // queue it directly
    enqueue_op(
      static_cast<MOSDFastDispatchOp*>(m)->get_spg(),
      op,
      static_cast<MOSDFastDispatchOp*>(m)->get_map_epoch());
  } else {
    // legacy client, and this is an MOSDOp (the *only* fast dispatch
    // message that didn't have an explicit spg_t); we need to map
    // them to an spg_t while preserving delivery order.
    Session *session = static_cast<Session*>(m->get_connection()->get_priv());
    if (session) {
      {
        Mutex::Locker l(session->session_dispatch_lock);
        op->get();
        session->waiting_on_map.push_back(*op);
        OSDMapRef nextmap = service.get_nextmap_reserved();
        dispatch_session_waiting(session, nextmap);
        service.release_map(nextmap);
      }
      session->put();
    }
  }
  OID_EVENT_TRACE_WITH_MSG(m, "MS_FAST_DISPATCH_END", false); 
}

void OSD::ms_fast_preprocess(Message *m)
{
  if (m->get_connection()->get_peer_type() == CEPH_ENTITY_TYPE_OSD) {
    if (m->get_type() == CEPH_MSG_OSD_MAP) {
      MOSDMap *mm = static_cast<MOSDMap*>(m);
      Session *s = static_cast<Session*>(m->get_connection()->get_priv());
      if (s) {
        s->received_map_lock.lock();
        s->received_map_epoch = mm->get_last();
        s->received_map_lock.unlock();
        s->put();
      }
    }
  }
}

bool OSD::ms_get_authorizer(int dest_type, AuthAuthorizer **authorizer, bool force_new)
{
  dout(10) << "OSD::ms_get_authorizer type=" << ceph_entity_type_name(dest_type) << dendl;

  if (is_stopping()) {
    dout(10) << __func__ << " bailing, we are shutting down" << dendl;
    return false;
  }

  if (dest_type == CEPH_ENTITY_TYPE_MON)
    return true;

  if (force_new) {
    /* the MonClient checks keys every tick(), so we should just wait for that cycle
       to get through */
    if (monc->wait_auth_rotating(10) < 0) {
      derr << "OSD::ms_get_authorizer wait_auth_rotating failed" << dendl;
      return false;
    }
  }

  *authorizer = monc->build_authorizer(dest_type);
  return *authorizer != NULL;
}


bool OSD::ms_verify_authorizer(Connection *con, int peer_type,
                               int protocol, bufferlist& authorizer_data, bufferlist& authorizer_reply,
                               bool& isvalid, CryptoKey& session_key)
{
  AuthAuthorizeHandler *authorize_handler = 0;
  switch (peer_type) {
  case CEPH_ENTITY_TYPE_MDS:
    /*
     * note: mds is technically a client from our perspective, but
     * this makes the 'cluster' consistent w/ monitor's usage.
     */
  case CEPH_ENTITY_TYPE_OSD:
  case CEPH_ENTITY_TYPE_MGR:
    authorize_handler = authorize_handler_cluster_registry->get_handler(protocol);
    break;
  default:
    authorize_handler = authorize_handler_service_registry->get_handler(protocol);
  }
  if (!authorize_handler) {
    dout(0) << "No AuthAuthorizeHandler found for protocol " << protocol << dendl;
    isvalid = false;
    return true;
  }

  AuthCapsInfo caps_info;
  EntityName name;
  uint64_t global_id;
  uint64_t auid = CEPH_AUTH_UID_DEFAULT;

  isvalid = authorize_handler->verify_authorizer(
    cct, monc->rotating_secrets.get(),
    authorizer_data, authorizer_reply, name, global_id, caps_info, session_key,
    &auid);

  if (isvalid) {
    Session *s = static_cast<Session *>(con->get_priv());
    if (!s) {
      s = new Session(cct);
      con->set_priv(s->get());
      s->con = con;
      dout(10) << " new session " << s << " con=" << s->con << " addr=" << s->con->get_peer_addr() << dendl;
    }

    s->entity_name = name;
    if (caps_info.allow_all)
      s->caps.set_allow_all();
    s->auid = auid;

    if (caps_info.caps.length() > 0) {
      bufferlist::iterator p = caps_info.caps.begin();
      string str;
      try {
        ::decode(str, p);
      }
      catch (buffer::error& e) {
      }
      bool success = s->caps.parse(str);
      if (success)
        dout(10) << " session " << s << " " << s->entity_name << " has caps " << s->caps << " '" << str << "'" << dendl;
      else
        dout(10) << " session " << s << " " << s->entity_name << " failed to parse caps '" << str << "'" << dendl;
    }

    s->put();
  }
  return true;
}

void OSD::do_waiters()
{
  assert(osd_lock.is_locked());

  dout(10) << "do_waiters -- start" << dendl;
  while (!finished.empty()) {
    OpRequestRef next = finished.front();
    finished.pop_front();
    dispatch_op(next);
  }
  dout(10) << "do_waiters -- finish" << dendl;
}

void OSD::dispatch_op(OpRequestRef op)
{
  switch (op->get_req()->get_type()) {

  case MSG_OSD_PG_CREATE:
    handle_pg_create(op);
    break;
  case MSG_OSD_PG_NOTIFY:
    handle_pg_notify(op);
    break;
  case MSG_OSD_PG_QUERY:
    handle_pg_query(op);
    break;
  case MSG_OSD_PG_LOG:
    handle_pg_log(op);
    break;
  case MSG_OSD_PG_REMOVE:
    handle_pg_remove(op);
    break;
  case MSG_OSD_PG_INFO:
    handle_pg_info(op);
    break;
  case MSG_OSD_PG_TRIM:
    handle_pg_trim(op);
    break;
  case MSG_OSD_BACKFILL_RESERVE:
    handle_pg_backfill_reserve(op);
    break;
  case MSG_OSD_RECOVERY_RESERVE:
    handle_pg_recovery_reserve(op);
    break;
  }
}

void OSD::_dispatch(Message *m)
{
  assert(osd_lock.is_locked());
  dout(20) << "_dispatch " << m << " " << *m << dendl;

  switch (m->get_type()) {

    // -- don't need lock --
  case CEPH_MSG_PING:
    dout(10) << "ping from " << m->get_source() << dendl;
    m->put();
    break;

    // -- don't need OSDMap --

    // map and replication
  case CEPH_MSG_OSD_MAP:
    handle_osd_map(static_cast<MOSDMap*>(m));
    break;

    // osd
  case MSG_PGSTATSACK:
    handle_pg_stats_ack(static_cast<MPGStatsAck*>(m));
    break;

  case MSG_MON_COMMAND:
    handle_command(static_cast<MMonCommand*>(m));
    break;
  case MSG_COMMAND:
    handle_command(static_cast<MCommand*>(m));
    break;

  case MSG_OSD_SCRUB:
    handle_scrub(static_cast<MOSDScrub*>(m));
    break;

    // -- need OSDMap --

  case MSG_OSD_PG_CREATE:
  case MSG_OSD_PG_NOTIFY:
  case MSG_OSD_PG_QUERY:
  case MSG_OSD_PG_LOG:
  case MSG_OSD_PG_REMOVE:
  case MSG_OSD_PG_INFO:
  case MSG_OSD_PG_TRIM:
  case MSG_OSD_BACKFILL_RESERVE:
  case MSG_OSD_RECOVERY_RESERVE:
    {
      OpRequestRef op = op_tracker.create_request<OpRequest, Message*>(m);
      if (m->trace)
        op->osd_trace.init("osd op", &trace_endpoint, &m->trace);
      // no map?  starting up?
      if (!osdmap) {
        dout(7) << "no OSDMap, not booted" << dendl;
        logger->inc(l_osd_waiting_for_map);
        waiting_for_osdmap.push_back(op);
        op->mark_delayed("no osdmap");
        break;
      }

      // need OSDMap
      dispatch_op(op);
    }
  }
}

void OSD::handle_pg_scrub(MOSDScrub *m, PG *pg)
{
  pg->lock();
  if (pg->is_primary()) {
    pg->unreg_next_scrub();
    pg->scrubber.must_scrub = true;
    pg->scrubber.must_deep_scrub = m->deep || m->repair;
    pg->scrubber.must_repair = m->repair;
    pg->reg_next_scrub();
    dout(10) << "marking " << *pg << " for scrub" << dendl;
  }
  pg->unlock();
}

void OSD::handle_scrub(MOSDScrub *m)
{
  dout(10) << "handle_scrub " << *m << dendl;
  if (!require_mon_or_mgr_peer(m)) {
    m->put();
    return;
  }
  if (m->fsid != monc->get_fsid()) {
    dout(0) << "handle_scrub fsid " << m->fsid << " != " << monc->get_fsid() << dendl;
    m->put();
    return;
  }

  RWLock::RLocker l(pg_map_lock);
  if (m->scrub_pgs.empty()) {
    for (ceph::unordered_map<spg_t, PG*>::iterator p = pg_map.begin();
         p != pg_map.end();
         ++p)
      handle_pg_scrub(m, p->second);
  } else {
    for (vector<pg_t>::iterator p = m->scrub_pgs.begin();
         p != m->scrub_pgs.end();
         ++p) {
      spg_t pcand;
      if (osdmap->get_primary_shard(*p, &pcand)) {
        auto pg_map_entry = pg_map.find(pcand);
        if (pg_map_entry != pg_map.end()) {
          handle_pg_scrub(m, pg_map_entry->second);
        }
      }
    }
  }

  m->put();
}

bool OSD::scrub_random_backoff()
{
  bool coin_flip = (rand() / (double)RAND_MAX >=
                    cct->_conf->osd_scrub_backoff_ratio);
  if (!coin_flip) {
    dout(20) << "scrub_random_backoff lost coin flip, randomly backing off" << dendl;
    return true;
  }
  return false;
}

OSDService::ScrubJob::ScrubJob(CephContext* cct,
                               const spg_t& pg, const utime_t& timestamp,
                               double pool_scrub_min_interval,
                               double pool_scrub_max_interval, bool must)
  : cct(cct),
    pgid(pg),
    sched_time(timestamp),
    deadline(timestamp)
{
  // if not explicitly requested, postpone the scrub with a random delay
  if (!must) {
    double scrub_min_interval = pool_scrub_min_interval > 0 ?
      pool_scrub_min_interval : cct->_conf->osd_scrub_min_interval;
    double scrub_max_interval = pool_scrub_max_interval > 0 ?
      pool_scrub_max_interval : cct->_conf->osd_scrub_max_interval;

    sched_time += scrub_min_interval;
    double r = rand() / (double)RAND_MAX;
    sched_time +=
      scrub_min_interval * cct->_conf->osd_scrub_interval_randomize_ratio * r;
    deadline += scrub_max_interval;
  }
}

bool OSDService::ScrubJob::ScrubJob::operator<(const OSDService::ScrubJob& rhs) const {
  if (sched_time < rhs.sched_time)
    return true;
  if (sched_time > rhs.sched_time)
    return false;
  return pgid < rhs.pgid;
}

bool OSD::scrub_time_permit(utime_t now)
{
  struct tm bdt;
  time_t tt = now.sec();
  localtime_r(&tt, &bdt);
  bool time_permit = false;
  if (cct->_conf->osd_scrub_begin_hour < cct->_conf->osd_scrub_end_hour) {
    if (bdt.tm_hour >= cct->_conf->osd_scrub_begin_hour && bdt.tm_hour < cct->_conf->osd_scrub_end_hour) {
      time_permit = true;
    }
  } else {
    if (bdt.tm_hour >= cct->_conf->osd_scrub_begin_hour || bdt.tm_hour < cct->_conf->osd_scrub_end_hour) {
      time_permit = true;
    }
  }
  if (!time_permit) {
    dout(20) << __func__ << " should run between " << cct->_conf->osd_scrub_begin_hour
            << " - " << cct->_conf->osd_scrub_end_hour
            << " now " << bdt.tm_hour << " = no" << dendl;
  } else {
    dout(20) << __func__ << " should run between " << cct->_conf->osd_scrub_begin_hour
            << " - " << cct->_conf->osd_scrub_end_hour
            << " now " << bdt.tm_hour << " = yes" << dendl;
  }
  return time_permit;
}

bool OSD::scrub_load_below_threshold()
{
  double loadavgs[3];
  if (getloadavg(loadavgs, 3) != 3) {
    dout(10) << __func__ << " couldn't read loadavgs\n" << dendl;
    return false;
  }

  // allow scrub if below configured threshold
  if (loadavgs[0] < cct->_conf->osd_scrub_load_threshold) {
    dout(20) << __func__ << " loadavg " << loadavgs[0]
             << " < max " << cct->_conf->osd_scrub_load_threshold
             << " = yes" << dendl;
    return true;
  }

  // allow scrub if below daily avg and currently decreasing
  if (loadavgs[0] < daily_loadavg && loadavgs[0] < loadavgs[2]) {
    dout(20) << __func__ << " loadavg " << loadavgs[0]
             << " < daily_loadavg " << daily_loadavg
             << " and < 15m avg " << loadavgs[2]
             << " = yes" << dendl;
    return true;
  }

  dout(20) << __func__ << " loadavg " << loadavgs[0]
           << " >= max " << cct->_conf->osd_scrub_load_threshold
           << " and ( >= daily_loadavg " << daily_loadavg
           << " or >= 15m avg " << loadavgs[2]
           << ") = no" << dendl;
  return false;
}

void OSD::sched_scrub()
{
  // if not permitted, fail fast
  if (!service.can_inc_scrubs_pending()) {
    return;
  }

  utime_t now = ceph_clock_now();
  bool time_permit = scrub_time_permit(now);
  bool load_is_low = scrub_load_below_threshold();
  dout(20) << "sched_scrub load_is_low=" << (int)load_is_low << dendl;

  OSDService::ScrubJob scrub;
  if (service.first_scrub_stamp(&scrub)) {
    do {
      dout(30) << "sched_scrub examine " << scrub.pgid << " at " << scrub.sched_time << dendl;

      if (scrub.sched_time > now) {
        // save ourselves some effort
        dout(10) << "sched_scrub " << scrub.pgid << " scheduled at " << scrub.sched_time
                 << " > " << now << dendl;
        break;
      }

      if (!cct->_conf->osd_scrub_during_recovery && service.is_recovery_active()) {
        dout(10) << __func__ << "not scheduling scrub of " << scrub.pgid << " due to active recovery ops" << dendl;
        break;
      }

      if ((scrub.deadline >= now) && !(time_permit && load_is_low)) {
        dout(10) << __func__ << " not scheduling scrub for " << scrub.pgid << " due to "
                 << (!time_permit ? "time not permit" : "high load") << dendl;
        continue;
      }

      PG *pg = _lookup_lock_pg(scrub.pgid);
      if (!pg)
        continue;
      if (pg->get_pgbackend()->scrub_supported() && pg->is_active()) {
        dout(10) << "sched_scrub scrubbing " << scrub.pgid << " at " << scrub.sched_time
                 << (pg->scrubber.must_scrub ? ", explicitly requested" :
                     (load_is_low ? ", load_is_low" : " deadline < now"))
                 << dendl;
        if (pg->sched_scrub()) {
          pg->unlock();
          break;
        }
      }
      pg->unlock();
    } while (service.next_scrub_stamp(scrub, &scrub));
  }
  dout(20) << "sched_scrub done" << dendl;
}



// =====================================================
// MAP

void OSD::wait_for_new_map(OpRequestRef op)
{
  // ask?
  if (waiting_for_osdmap.empty()) {
    osdmap_subscribe(osdmap->get_epoch() + 1, false);
  }

  logger->inc(l_osd_waiting_for_map);
  waiting_for_osdmap.push_back(op);
  op->mark_delayed("wait for new map");
}


/** update_map
 * assimilate new OSDMap(s).  scan pgs, etc.
 */

void OSD::note_down_osd(int peer)
{
  assert(osd_lock.is_locked());
  cluster_messenger->mark_down(osdmap->get_cluster_addr(peer));

  heartbeat_lock.Lock();
  failure_queue.erase(peer);
  failure_pending.erase(peer);
  map<int,HeartbeatInfo>::iterator p = heartbeat_peers.find(peer);
  if (p != heartbeat_peers.end()) {
    p->second.con_back->mark_down();
    if (p->second.con_front) {
      p->second.con_front->mark_down();
    }
    heartbeat_peers.erase(p);
  }
  heartbeat_lock.Unlock();
}

void OSD::note_up_osd(int peer)
{
  service.forget_peer_epoch(peer, osdmap->get_epoch() - 1);
  heartbeat_set_peers_need_update();
}

struct C_OnMapCommit : public Context {
  OSD *osd;
  epoch_t first, last;
  MOSDMap *msg;
  C_OnMapCommit(OSD *o, epoch_t f, epoch_t l, MOSDMap *m)
    : osd(o), first(f), last(l), msg(m) {}
  void finish(int r) override {
    osd->_committed_osd_maps(first, last, msg);
    msg->put();
  }
};

struct C_OnMapApply : public Context {
  OSDService *service;
  list<OSDMapRef> pinned_maps;
  epoch_t e;
  C_OnMapApply(OSDService *service,
               const list<OSDMapRef> &pinned_maps,
               epoch_t e)
    : service(service), pinned_maps(pinned_maps), e(e) {}
  void finish(int r) override {
    service->clear_map_bl_cache_pins(e);
  }
};

void OSD::osdmap_subscribe(version_t epoch, bool force_request)
{
  OSDMapRef osdmap = service.get_osdmap();
  if (osdmap->get_epoch() >= epoch)
    return;

  if (monc->sub_want_increment("osdmap", epoch, CEPH_SUBSCRIBE_ONETIME) ||
      force_request) {
    monc->renew_subs();
  }
}

void OSD::trim_maps(epoch_t oldest, int nreceived, bool skip_maps)
{
  epoch_t min = std::min(oldest, service.map_cache.cached_key_lower_bound());
  if (min <= superblock.oldest_map)
    return;

  int num = 0;
  ObjectStore::Transaction t;
  for (epoch_t e = superblock.oldest_map; e < min; ++e) {
    dout(20) << " removing old osdmap epoch " << e << dendl;
    t.remove(coll_t::meta(), get_osdmap_pobject_name(e));
    t.remove(coll_t::meta(), get_inc_osdmap_pobject_name(e));
    superblock.oldest_map = e + 1;
    num++;
    if (num >= cct->_conf->osd_target_transaction_size && num >= nreceived) {
      service.publish_superblock(superblock);
      write_superblock(t);
      int tr = store->queue_transaction(service.meta_osr.get(), std::move(t), nullptr);
      assert(tr == 0);
      num = 0;
      if (!skip_maps) {
        // skip_maps leaves us with a range of old maps if we fail to remove all
        // of them before moving superblock.oldest_map forward to the first map
        // in the incoming MOSDMap msg. so we should continue removing them in
        // this case, even we could do huge series of delete transactions all at
        // once.
        break;
      }
    }
  }
  if (num > 0) {
    service.publish_superblock(superblock);
    write_superblock(t);
    int tr = store->queue_transaction(service.meta_osr.get(), std::move(t), nullptr);
    assert(tr == 0);
  }
  // we should not remove the cached maps
  assert(min <= service.map_cache.cached_key_lower_bound());
}

void OSD::handle_osd_map(MOSDMap *m)
{
  assert(osd_lock.is_locked());
  // Keep a ref in the list until we get the newly received map written
  // onto disk. This is important because as long as the refs are alive,
  // the OSDMaps will be pinned in the cache and we won't try to read it
  // off of disk. Otherwise these maps will probably not stay in the cache,
  // and reading those OSDMaps before they are actually written can result
  // in a crash. 
  list<OSDMapRef> pinned_maps;
  if (m->fsid != monc->get_fsid()) {
    dout(0) << "handle_osd_map fsid " << m->fsid << " != "
            << monc->get_fsid() << dendl;
    m->put();
    return;
  }
  if (is_initializing()) {
    dout(0) << "ignoring osdmap until we have initialized" << dendl;
    m->put();
    return;
  }

  Session *session = static_cast<Session *>(m->get_connection()->get_priv());
  if (session && !(session->entity_name.is_mon() ||
                   session->entity_name.is_osd())) {
    //not enough perms!
    dout(10) << "got osd map from Session " << session
             << " which we can't take maps from (not a mon or osd)" << dendl;
    m->put();
    session->put();
    return;
  }
  if (session)
    session->put();

  // share with the objecter
  if (!is_preboot())
    service.objecter->handle_osd_map(m);

  epoch_t first = m->get_first();
  epoch_t last = m->get_last();
  dout(3) << "handle_osd_map epochs [" << first << "," << last << "], i have "
          << superblock.newest_map
          << ", src has [" << m->oldest_map << "," << m->newest_map << "]"
          << dendl;

  logger->inc(l_osd_map);
  logger->inc(l_osd_mape, last - first + 1);
  if (first <= superblock.newest_map)
    logger->inc(l_osd_mape_dup, superblock.newest_map - first + 1);
  if (service.max_oldest_map < m->oldest_map) {
    service.max_oldest_map = m->oldest_map;
    assert(service.max_oldest_map >= superblock.oldest_map);
  }

  // make sure there is something new, here, before we bother flushing
  // the queues and such
  if (last <= superblock.newest_map) {
    dout(10) << " no new maps here, dropping" << dendl;
    m->put();
    return;
  }

  // missing some?
  bool skip_maps = false;
  if (first > superblock.newest_map + 1) {
    dout(10) << "handle_osd_map message skips epochs "
             << superblock.newest_map + 1 << ".." << (first-1) << dendl;
    if (m->oldest_map <= superblock.newest_map + 1) {
      osdmap_subscribe(superblock.newest_map + 1, false);
      m->put();
      return;
    }
    // always try to get the full range of maps--as many as we can.  this
    //  1- is good to have
    //  2- is at present the only way to ensure that we get a *full* map as
    //     the first map!
    if (m->oldest_map < first) {
      osdmap_subscribe(m->oldest_map - 1, true);
      m->put();
      return;
    }
    skip_maps = true;
  }

  ObjectStore::Transaction t;
  uint64_t txn_size = 0;

  // store new maps: queue for disk and put in the osdmap cache
  epoch_t start = MAX(superblock.newest_map + 1, first);
  for (epoch_t e = start; e <= last; e++) {
    if (txn_size >= t.get_num_bytes()) {
      derr << __func__ << " transaction size overflowed" << dendl;
      assert(txn_size < t.get_num_bytes());
    }
    txn_size = t.get_num_bytes();
    map<epoch_t,bufferlist>::iterator p;
    p = m->maps.find(e);
    if (p != m->maps.end()) {
      dout(10) << "handle_osd_map  got full map for epoch " << e << dendl;
      OSDMap *o = new OSDMap;
      bufferlist& bl = p->second;

      o->decode(bl);

      ghobject_t fulloid = get_osdmap_pobject_name(e);
      t.write(coll_t::meta(), fulloid, 0, bl.length(), bl);
      pin_map_bl(e, bl);
      pinned_maps.push_back(add_map(o));

      got_full_map(e);
      continue;
    }

    p = m->incremental_maps.find(e);
    if (p != m->incremental_maps.end()) {
      dout(10) << "handle_osd_map  got inc map for epoch " << e << dendl;
      bufferlist& bl = p->second;
      ghobject_t oid = get_inc_osdmap_pobject_name(e);
      t.write(coll_t::meta(), oid, 0, bl.length(), bl);
      pin_map_inc_bl(e, bl);

      OSDMap *o = new OSDMap;
      if (e > 1) {
        bufferlist obl;
        bool got = get_map_bl(e - 1, obl);
        assert(got);
        o->decode(obl);
      }

      OSDMap::Incremental inc;
      bufferlist::iterator p = bl.begin();
      inc.decode(p);
      if (o->apply_incremental(inc) < 0) {
        derr << "ERROR: bad fsid?  i have " << osdmap->get_fsid() << " and inc has " << inc.fsid << dendl;
        assert(0 == "bad fsid");
      }

      bufferlist fbl;
      o->encode(fbl, inc.encode_features | CEPH_FEATURE_RESERVED);

      bool injected_failure = false;
      if (cct->_conf->osd_inject_bad_map_crc_probability > 0 &&
          (rand() % 10000) < cct->_conf->osd_inject_bad_map_crc_probability*10000.0) {
        derr << __func__ << " injecting map crc failure" << dendl;
        injected_failure = true;
      }

      if ((inc.have_crc && o->get_crc() != inc.full_crc) || injected_failure) {
        dout(2) << "got incremental " << e
                << " but failed to encode full with correct crc; requesting"
                << dendl;
        clog->warn() << "failed to encode map e" << e << " with expected crc";
        dout(20) << "my encoded map was:\n";
        fbl.hexdump(*_dout);
        *_dout << dendl;
        delete o;
        request_full_map(e, last);
        last = e - 1;
        break;
      }
      got_full_map(e);

      ghobject_t fulloid = get_osdmap_pobject_name(e);
      t.write(coll_t::meta(), fulloid, 0, fbl.length(), fbl);
      pin_map_bl(e, fbl);
      pinned_maps.push_back(add_map(o));
      continue;
    }

    assert(0 == "MOSDMap lied about what maps it had?");
  }

  // even if this map isn't from a mon, we may have satisfied our subscription
  monc->sub_got("osdmap", last);

  if (!m->maps.empty() && requested_full_first) {
    dout(10) << __func__ << " still missing full maps " << requested_full_first
             << ".." << requested_full_last << dendl;
    rerequest_full_maps();
  }

  if (superblock.oldest_map) {
    // make sure we at least keep pace with incoming maps
    trim_maps(m->oldest_map, last - first + 1, skip_maps);
  }

  if (!superblock.oldest_map || skip_maps)
    superblock.oldest_map = first;
  superblock.newest_map = last;
  superblock.current_epoch = last;

  // note in the superblock that we were clean thru the prior epoch
  epoch_t boot_epoch = service.get_boot_epoch();
  if (boot_epoch && boot_epoch >= superblock.mounted) {
    superblock.mounted = boot_epoch;
    superblock.clean_thru = last;
  }

  // superblock and commit
  write_superblock(t);
  store->queue_transaction(
    service.meta_osr.get(),
    std::move(t),
    new C_OnMapApply(&service, pinned_maps, last),
    new C_OnMapCommit(this, start, last, m), 0);
  service.publish_superblock(superblock);
}

void OSD::_committed_osd_maps(epoch_t first, epoch_t last, MOSDMap *m)
{
  dout(10) << __func__ << " " << first << ".." << last << dendl;
  if (is_stopping()) {
    dout(10) << __func__ << " bailing, we are shutting down" << dendl;
    return;
  }
  Mutex::Locker l(osd_lock);
  if (is_stopping()) {
    dout(10) << __func__ << " bailing, we are shutting down" << dendl;
    return;
  }
  map_lock.get_write();

  bool do_shutdown = false;
  bool do_restart = false;
  bool network_error = false;

  // advance through the new maps
  for (epoch_t cur = first; cur <= last; cur++) {
    dout(10) << " advance to epoch " << cur
             << " (<= last " << last
             << " <= newest_map " << superblock.newest_map
             << ")" << dendl;

    OSDMapRef newmap = get_map(cur);
    assert(newmap);  // we just cached it above!

    // start blacklisting messages sent to peers that go down.
    service.pre_publish_map(newmap);

    // kill connections to newly down osds
    bool waited_for_reservations = false;
    set<int> old;
    osdmap->get_all_osds(old);
    for (set<int>::iterator p = old.begin(); p != old.end(); ++p) {
      if (*p != whoami &&
          osdmap->is_up(*p) && // in old map
          newmap->is_down(*p)) {    // but not the new one
        if (!waited_for_reservations) {
          service.await_reserved_maps();
          waited_for_reservations = true;
        }
        note_down_osd(*p);
      } else if (*p != whoami &&
                osdmap->is_down(*p) &&
                newmap->is_up(*p)) {
        note_up_osd(*p);
      }
    }

    if ((osdmap->test_flag(CEPH_OSDMAP_NOUP) !=
        newmap->test_flag(CEPH_OSDMAP_NOUP)) ||
        (osdmap->is_noup(whoami) != newmap->is_noup(whoami))) {
      dout(10) << __func__ << " NOUP flag changed in " << newmap->get_epoch()
               << dendl;
      if (is_booting()) {
        // this captures the case where we sent the boot message while
        // NOUP was being set on the mon and our boot request was
        // dropped, and then later it is cleared.  it imperfectly
        // handles the case where our original boot message was not
        // dropped and we restart even though we might have booted, but
        // that is harmless (boot will just take slightly longer).
        do_restart = true;
      }
    }
    if (osdmap->require_osd_release < CEPH_RELEASE_LUMINOUS &&
        newmap->require_osd_release >= CEPH_RELEASE_LUMINOUS) {
      dout(10) << __func__ << " require_osd_release reached luminous in "
               << newmap->get_epoch() << dendl;
      clear_pg_stat_queue();
      clear_outstanding_pg_stats();
    }

    osdmap = newmap;
    epoch_t up_epoch;
    epoch_t boot_epoch;
    service.retrieve_epochs(&boot_epoch, &up_epoch, NULL);
    if (!up_epoch &&
        osdmap->is_up(whoami) &&
        osdmap->get_inst(whoami) == client_messenger->get_myinst()) {
      up_epoch = osdmap->get_epoch();
      dout(10) << "up_epoch is " << up_epoch << dendl;
      if (!boot_epoch) {
        boot_epoch = osdmap->get_epoch();
        dout(10) << "boot_epoch is " << boot_epoch << dendl;
      }
      service.set_epochs(&boot_epoch, &up_epoch, NULL);
    }
  }

  had_map_since = ceph_clock_now();

  epoch_t _bind_epoch = service.get_bind_epoch();
  if (osdmap->is_up(whoami) &&
      osdmap->get_addr(whoami) == client_messenger->get_myaddr() &&
      _bind_epoch < osdmap->get_up_from(whoami)) {

    if (is_booting()) {
      dout(1) << "state: booting -> active" << dendl;
      set_state(STATE_ACTIVE);

      // set incarnation so that osd_reqid_t's we generate for our
      // objecter requests are unique across restarts.
      service.objecter->set_client_incarnation(osdmap->get_epoch());
    }
  }

  if (osdmap->get_epoch() > 0 &&
      is_active()) {
    if (!osdmap->exists(whoami)) {
      dout(0) << "map says i do not exist.  shutting down." << dendl;
      do_shutdown = true;   // don't call shutdown() while we have
                            // everything paused
    } else if (!osdmap->is_up(whoami) ||
               !osdmap->get_addr(whoami).probably_equals(
                 client_messenger->get_myaddr()) ||
               !osdmap->get_cluster_addr(whoami).probably_equals(
                 cluster_messenger->get_myaddr()) ||
               !osdmap->get_hb_back_addr(whoami).probably_equals(
                 hb_back_server_messenger->get_myaddr()) ||
               (osdmap->get_hb_front_addr(whoami) != entity_addr_t() &&
                !osdmap->get_hb_front_addr(whoami).probably_equals(
                  hb_front_server_messenger->get_myaddr()))) {
      if (!osdmap->is_up(whoami)) {
        if (service.is_preparing_to_stop() || service.is_stopping()) {
          service.got_stop_ack();
        } else {
          clog->warn() << "map e" << osdmap->get_epoch()
                       << " wrongly marked me down at e"
                       << osdmap->get_down_at(whoami);
        }
      } else if (!osdmap->get_addr(whoami).probably_equals(
                   client_messenger->get_myaddr())) {
        clog->error() << "map e" << osdmap->get_epoch()
                      << " had wrong client addr (" << osdmap->get_addr(whoami)
                      << " != my " << client_messenger->get_myaddr() << ")";
      } else if (!osdmap->get_cluster_addr(whoami).probably_equals(
                   cluster_messenger->get_myaddr())) {
        clog->error() << "map e" << osdmap->get_epoch()
                      << " had wrong cluster addr ("
                      << osdmap->get_cluster_addr(whoami)
                      << " != my " << cluster_messenger->get_myaddr() << ")";
      } else if (!osdmap->get_hb_back_addr(whoami).probably_equals(
                   hb_back_server_messenger->get_myaddr())) {
        clog->error() << "map e" << osdmap->get_epoch()
                      << " had wrong hb back addr ("
                      << osdmap->get_hb_back_addr(whoami)
                      << " != my " << hb_back_server_messenger->get_myaddr()
                      << ")";
      } else if (osdmap->get_hb_front_addr(whoami) != entity_addr_t() &&
                 !osdmap->get_hb_front_addr(whoami).probably_equals(
                   hb_front_server_messenger->get_myaddr())) {
        clog->error() << "map e" << osdmap->get_epoch()
                      << " had wrong hb front addr ("
                      << osdmap->get_hb_front_addr(whoami)
                      << " != my " << hb_front_server_messenger->get_myaddr()
                      << ")";
      }

      if (!service.is_stopping()) {
        epoch_t up_epoch = 0;
        epoch_t bind_epoch = osdmap->get_epoch();
        service.set_epochs(NULL,&up_epoch, &bind_epoch);
        do_restart = true;

        //add markdown log
        utime_t now = ceph_clock_now();
        utime_t grace = utime_t(cct->_conf->osd_max_markdown_period, 0);
        osd_markdown_log.push_back(now);
        //clear all out-of-date log
        while (!osd_markdown_log.empty() &&
               osd_markdown_log.front() + grace < now)
          osd_markdown_log.pop_front();
        if ((int)osd_markdown_log.size() > cct->_conf->osd_max_markdown_count) {
          dout(0) << __func__ << " marked down "
                  << osd_markdown_log.size()
                  << " > osd_max_markdown_count "
                  << cct->_conf->osd_max_markdown_count
                  << " in last " << grace << " seconds, shutting down"
                  << dendl;
          do_restart = false;
          do_shutdown = true;
        }

        start_waiting_for_healthy();

        set<int> avoid_ports;
#if defined(__FreeBSD__)
        // prevent FreeBSD from grabbing the client_messenger port during
        // rebinding. In which case a cluster_meesneger will connect also 
        // to the same port
        avoid_ports.insert(client_messenger->get_myaddr().get_port());
#endif
        avoid_ports.insert(cluster_messenger->get_myaddr().get_port());
        avoid_ports.insert(hb_back_server_messenger->get_myaddr().get_port());
        avoid_ports.insert(hb_front_server_messenger->get_myaddr().get_port());

        int r = cluster_messenger->rebind(avoid_ports);
        if (r != 0) {
          do_shutdown = true;  // FIXME: do_restart?
          network_error = true;
          dout(0) << __func__ << " marked down:"
                  << " rebind cluster_messenger failed" << dendl;
        }

        r = hb_back_server_messenger->rebind(avoid_ports);
        if (r != 0) {
          do_shutdown = true;  // FIXME: do_restart?
          network_error = true;
          dout(0) << __func__ << " marked down:"
                  << " rebind hb_back_server_messenger failed" << dendl;
        }

        r = hb_front_server_messenger->rebind(avoid_ports);
        if (r != 0) {
          do_shutdown = true;  // FIXME: do_restart?
          network_error = true;
          dout(0) << __func__ << " marked down:" 
                  << " rebind hb_front_server_messenger failed" << dendl;
        }

        hb_front_client_messenger->mark_down_all();
        hb_back_client_messenger->mark_down_all();

        reset_heartbeat_peers();
      }
    }
  }

  map_lock.put_write();

  check_osdmap_features(store);

  // yay!
  consume_map();

  if (is_active() || is_waiting_for_healthy())
    maybe_update_heartbeat_peers();

  if (!is_active()) {
    dout(10) << " not yet active; waiting for peering wq to drain" << dendl;
    peering_wq.drain();
  } else {
    activate_map();
  }

  if (do_shutdown) {
    if (network_error) {
      Mutex::Locker l(heartbeat_lock);
      map<int,pair<utime_t,entity_inst_t>>::iterator it =
        failure_pending.begin();
      while (it != failure_pending.end()) {
        dout(10) << "handle_osd_ping canceling in-flight failure report for osd."
                 << it->first << dendl;
        send_still_alive(osdmap->get_epoch(), it->second.second);
        failure_pending.erase(it++);
      }
    }
    // trigger shutdown in a different thread
    dout(0) << __func__ << " shutdown OSD via async signal" << dendl;
    queue_async_signal(SIGINT);
  }
  else if (m->newest_map && m->newest_map > last) {
    dout(10) << " msg say newest map is " << m->newest_map
             << ", requesting more" << dendl;
    osdmap_subscribe(osdmap->get_epoch()+1, false);
  }
  else if (is_preboot()) {
    if (m->get_source().is_mon())
      _preboot(m->oldest_map, m->newest_map);
    else
      start_boot();
  }
  else if (do_restart)
    start_boot();

}

void OSD::check_osdmap_features(ObjectStore *fs)
{
  // adjust required feature bits?

  // we have to be a bit careful here, because we are accessing the
  // Policy structures without taking any lock.  in particular, only
  // modify integer values that can safely be read by a racing CPU.
  // since we are only accessing existing Policy structures a their
  // current memory location, and setting or clearing bits in integer
  // fields, and we are the only writer, this is not a problem.

  {
    Messenger::Policy p = client_messenger->get_default_policy();
    uint64_t mask;
    uint64_t features = osdmap->get_features(entity_name_t::TYPE_CLIENT, &mask);
    if ((p.features_required & mask) != features) {
      dout(0) << "crush map has features " << features
              << ", adjusting msgr requires for clients" << dendl;
      p.features_required = (p.features_required & ~mask) | features;
      client_messenger->set_default_policy(p);
    }
  }
  {
    Messenger::Policy p = client_messenger->get_policy(entity_name_t::TYPE_MON);
    uint64_t mask;
    uint64_t features = osdmap->get_features(entity_name_t::TYPE_MON, &mask);
    if ((p.features_required & mask) != features) {
      dout(0) << "crush map has features " << features
              << " was " << p.features_required
              << ", adjusting msgr requires for mons" << dendl;
      p.features_required = (p.features_required & ~mask) | features;
      client_messenger->set_policy(entity_name_t::TYPE_MON, p);
    }
  }
  {
    Messenger::Policy p = cluster_messenger->get_policy(entity_name_t::TYPE_OSD);
    uint64_t mask;
    uint64_t features = osdmap->get_features(entity_name_t::TYPE_OSD, &mask);

    if ((p.features_required & mask) != features) {
      dout(0) << "crush map has features " << features
              << ", adjusting msgr requires for osds" << dendl;
      p.features_required = (p.features_required & ~mask) | features;
      cluster_messenger->set_policy(entity_name_t::TYPE_OSD, p);
    }

    if ((features & CEPH_FEATURE_OSD_ERASURE_CODES) &&
        !superblock.compat_features.incompat.contains(CEPH_OSD_FEATURE_INCOMPAT_SHARDS)) {
      dout(0) << __func__ << " enabling on-disk ERASURE CODES compat feature" << dendl;
      superblock.compat_features.incompat.insert(CEPH_OSD_FEATURE_INCOMPAT_SHARDS);
      ObjectStore::Transaction t;
      write_superblock(t);
      int err = store->queue_transaction(service.meta_osr.get(), std::move(t), NULL);
      assert(err == 0);
    }
  }
}

bool OSD::advance_pg(
  epoch_t osd_epoch, PG *pg,
  ThreadPool::TPHandle &handle,
  PG::RecoveryCtx *rctx,
  set<PGRef> *new_pgs)
{
  assert(pg->is_locked());
  epoch_t next_epoch = pg->get_osdmap()->get_epoch() + 1;
  OSDMapRef lastmap = pg->get_osdmap();

  if (lastmap->get_epoch() == osd_epoch)
    return true;
  assert(lastmap->get_epoch() < osd_epoch);

  epoch_t min_epoch = service.get_min_pg_epoch();
  epoch_t max;
  if (min_epoch) {
    max = min_epoch + cct->_conf->osd_map_max_advance;
  } else {
    max = next_epoch + cct->_conf->osd_map_max_advance;
  }

  for (;
       next_epoch <= osd_epoch && next_epoch <= max;
       ++next_epoch) {
    OSDMapRef nextmap = service.try_get_map(next_epoch);
    if (!nextmap) {
      dout(20) << __func__ << " missing map " << next_epoch << dendl;
      // make sure max is bumped up so that we can get past any
      // gap in maps
      max = MAX(max, next_epoch + cct->_conf->osd_map_max_advance);
      continue;
    }

    vector<int> newup, newacting;
    int up_primary, acting_primary;
    nextmap->pg_to_up_acting_osds(
      pg->info.pgid.pgid,
      &newup, &up_primary,
      &newacting, &acting_primary);
    pg->handle_advance_map(
      nextmap, lastmap, newup, up_primary,
      newacting, acting_primary, rctx);

    // Check for split!
    set<spg_t> children;
    spg_t parent(pg->info.pgid);
    if (parent.is_split(
        lastmap->get_pg_num(pg->pool.id),
        nextmap->get_pg_num(pg->pool.id),
        &children)) {
      service.mark_split_in_progress(pg->info.pgid, children);
      split_pgs(
        pg, children, new_pgs, lastmap, nextmap,
        rctx);
    }

    lastmap = nextmap;
    handle.reset_tp_timeout();
  }
  service.pg_update_epoch(pg->info.pgid, lastmap->get_epoch());
  pg->handle_activate_map(rctx);
  if (next_epoch <= osd_epoch) {
    dout(10) << __func__ << " advanced to max " << max
             << " past min epoch " << min_epoch
             << " ... will requeue " << *pg << dendl;
    return false;
  }
  return true;
}

void OSD::consume_map()
{
  assert(osd_lock.is_locked());
  dout(7) << "consume_map version " << osdmap->get_epoch() << dendl;

  int num_pg_primary = 0, num_pg_replica = 0, num_pg_stray = 0;
  list<PGRef> to_remove;

  // scan pg's
  {
    RWLock::RLocker l(pg_map_lock);
    for (ceph::unordered_map<spg_t,PG*>::iterator it = pg_map.begin();
        it != pg_map.end();
        ++it) {
      PG *pg = it->second;
      pg->lock();
      if (pg->is_primary())
        num_pg_primary++;
      else if (pg->is_replica())
        num_pg_replica++;
      else
        num_pg_stray++;

      if (!osdmap->have_pg_pool(pg->info.pgid.pool())) {
        //pool is deleted!
        to_remove.push_back(PGRef(pg));
      } else {
        service.init_splits_between(it->first, service.get_osdmap(), osdmap);
      }

      pg->unlock();
    }
  }

  for (list<PGRef>::iterator i = to_remove.begin();
       i != to_remove.end();
       to_remove.erase(i++)) {
    RWLock::WLocker locker(pg_map_lock);
    (*i)->lock();
    _remove_pg(&**i);
    (*i)->unlock();
  }

  service.expand_pg_num(service.get_osdmap(), osdmap);

  service.pre_publish_map(osdmap);
  service.await_reserved_maps();
  service.publish_map(osdmap);

  service.maybe_inject_dispatch_delay();

  dispatch_sessions_waiting_on_map();

  service.maybe_inject_dispatch_delay();

  // remove any PGs which we no longer host from the session waiting_for_pg lists
  dout(20) << __func__ << " checking waiting_for_pg" << dendl;
  op_shardedwq.prune_pg_waiters(osdmap, whoami);

  service.maybe_inject_dispatch_delay();

  // scan pg's
  {
    RWLock::RLocker l(pg_map_lock);
    for (ceph::unordered_map<spg_t,PG*>::iterator it = pg_map.begin();
        it != pg_map.end();
        ++it) {
      PG *pg = it->second;
      pg->lock();
      pg->queue_null(osdmap->get_epoch(), osdmap->get_epoch());
      pg->unlock();
    }

    logger->set(l_osd_pg, pg_map.size());
  }
  logger->set(l_osd_pg_primary, num_pg_primary);
  logger->set(l_osd_pg_replica, num_pg_replica);
  logger->set(l_osd_pg_stray, num_pg_stray);
}

void OSD::activate_map()
{
  assert(osd_lock.is_locked());

  dout(7) << "activate_map version " << osdmap->get_epoch() << dendl;

  if (!osdmap->test_flag(CEPH_OSDMAP_SORTBITWISE)) {
    derr << __func__ << " SORTBITWISE flag is not set" << dendl;
    ceph_abort();
  }

  if (osdmap->test_flag(CEPH_OSDMAP_FULL)) {
    dout(10) << " osdmap flagged full, doing onetime osdmap subscribe" << dendl;
    osdmap_subscribe(osdmap->get_epoch() + 1, false);
  }

  // norecover?
  if (osdmap->test_flag(CEPH_OSDMAP_NORECOVER)) {
    if (!service.recovery_is_paused()) {
      dout(1) << "pausing recovery (NORECOVER flag set)" << dendl;
      service.pause_recovery();
    }
  } else {
    if (service.recovery_is_paused()) {
      dout(1) << "unpausing recovery (NORECOVER flag unset)" << dendl;
      service.unpause_recovery();
    }
  }

  service.activate_map();

  // process waiters
  take_waiters(waiting_for_osdmap);
}

bool OSD::require_mon_peer(const Message *m)
{
  if (!m->get_connection()->peer_is_mon()) {
    dout(0) << "require_mon_peer received from non-mon "
            << m->get_connection()->get_peer_addr()
            << " " << *m << dendl;
    return false;
  }
  return true;
}

bool OSD::require_mon_or_mgr_peer(const Message *m)
{
  if (!m->get_connection()->peer_is_mon() &&
      !m->get_connection()->peer_is_mgr()) {
    dout(0) << "require_mon_or_mgr_peer received from non-mon, non-mgr "
            << m->get_connection()->get_peer_addr()
            << " " << *m << dendl;
    return false;
  }
  return true;
}

bool OSD::require_osd_peer(const Message *m)
{
  if (!m->get_connection()->peer_is_osd()) {
    dout(0) << "require_osd_peer received from non-osd "
            << m->get_connection()->get_peer_addr()
            << " " << *m << dendl;
    return false;
  }
  return true;
}

bool OSD::require_self_aliveness(const Message *m, epoch_t epoch)
{
  epoch_t up_epoch = service.get_up_epoch();
  if (epoch < up_epoch) {
    dout(7) << "from pre-up epoch " << epoch << " < " << up_epoch << dendl;
    return false;
  }

  if (!is_active()) {
    dout(7) << "still in boot state, dropping message " << *m << dendl;
    return false;
  }

  return true;
}

bool OSD::require_same_peer_instance(const Message *m, OSDMapRef& map,
                                     bool is_fast_dispatch)
{
  int from = m->get_source().num();

  if (map->is_down(from) ||
      (map->get_cluster_addr(from) != m->get_source_inst().addr)) {
    dout(5) << "from dead osd." << from << ", marking down, "
            << " msg was " << m->get_source_inst().addr
            << " expected " << (map->is_up(from) ?
                                map->get_cluster_addr(from) : entity_addr_t())
            << dendl;
    ConnectionRef con = m->get_connection();
    con->mark_down();
    Session *s = static_cast<Session*>(con->get_priv());
    if (s) {
      if (!is_fast_dispatch)
        s->session_dispatch_lock.Lock();
      clear_session_waiting_on_map(s);
      con->set_priv(NULL);   // break ref <-> session cycle, if any
      if (!is_fast_dispatch)
        s->session_dispatch_lock.Unlock();
      s->put();
    }
    return false;
  }
  return true;
}


/*
 * require that we have same (or newer) map, and that
 * the source is the pg primary.
 */
bool OSD::require_same_or_newer_map(OpRequestRef& op, epoch_t epoch,
                                    bool is_fast_dispatch)
{
  const Message *m = op->get_req();
  dout(15) << "require_same_or_newer_map " << epoch
           << " (i am " << osdmap->get_epoch() << ") " << m << dendl;

  assert(osd_lock.is_locked());

  // do they have a newer map?
  if (epoch > osdmap->get_epoch()) {
    dout(7) << "waiting for newer map epoch " << epoch
            << " > my " << osdmap->get_epoch() << " with " << m << dendl;
    wait_for_new_map(op);
    return false;
  }

  if (!require_self_aliveness(op->get_req(), epoch)) {
    return false;
  }

  // ok, our map is same or newer.. do they still exist?
  if (m->get_connection()->get_messenger() == cluster_messenger &&
      !require_same_peer_instance(op->get_req(), osdmap, is_fast_dispatch)) {
    return false;
  }

  return true;
}





// ----------------------------------------
// pg creation

void OSD::split_pgs(
  PG *parent,
  const set<spg_t> &childpgids, set<PGRef> *out_pgs,
  OSDMapRef curmap,
  OSDMapRef nextmap,
  PG::RecoveryCtx *rctx)
{
  unsigned pg_num = nextmap->get_pg_num(
    parent->pool.id);
  parent->update_snap_mapper_bits(
    parent->info.pgid.get_split_bits(pg_num)
    );

  vector<object_stat_sum_t> updated_stats(childpgids.size() + 1);
  parent->info.stats.stats.sum.split(updated_stats);

  vector<object_stat_sum_t>::iterator stat_iter = updated_stats.begin();
  for (set<spg_t>::const_iterator i = childpgids.begin();
       i != childpgids.end();
       ++i, ++stat_iter) {
    assert(stat_iter != updated_stats.end());
    dout(10) << "Splitting " << *parent << " into " << *i << dendl;
    assert(service.splitting(*i));
    PG* child = _make_pg(nextmap, *i);
    child->lock(true);
    out_pgs->insert(child);
    rctx->created_pgs.insert(child);

    unsigned split_bits = i->get_split_bits(pg_num);
    dout(10) << "pg_num is " << pg_num << dendl;
    dout(10) << "m_seed " << i->ps() << dendl;
    dout(10) << "split_bits is " << split_bits << dendl;

    parent->split_colls(
      *i,
      split_bits,
      i->ps(),
      &child->pool.info,
      rctx->transaction);
    parent->split_into(
      i->pgid,
      child,
      split_bits);
    child->info.stats.stats.sum = *stat_iter;

    child->write_if_dirty(*(rctx->transaction));
    child->unlock();
  }
  assert(stat_iter != updated_stats.end());
  parent->info.stats.stats.sum = *stat_iter;
  parent->write_if_dirty(*(rctx->transaction));
}

/*
 * holding osd_lock
 */
void OSD::handle_pg_create(OpRequestRef op)
{
  const MOSDPGCreate *m = static_cast<const MOSDPGCreate*>(op->get_req());
  assert(m->get_type() == MSG_OSD_PG_CREATE);

  dout(10) << "handle_pg_create " << *m << dendl;

  if (!require_mon_peer(op->get_req())) {
    return;
  }

  if (!require_same_or_newer_map(op, m->epoch, false))
    return;

  op->mark_started();

  map<pg_t,utime_t>::const_iterator ci = m->ctimes.begin();
  for (map<pg_t,pg_create_t>::const_iterator p = m->mkpg.begin();
       p != m->mkpg.end();
       ++p, ++ci) {
    assert(ci != m->ctimes.end() && ci->first == p->first);
    epoch_t created = p->second.created;
    if (p->second.split_bits) // Skip split pgs
      continue;
    pg_t on = p->first;

    if (on.preferred() >= 0) {
      dout(20) << "ignoring localized pg " << on << dendl;
      continue;
    }

    if (!osdmap->have_pg_pool(on.pool())) {
      dout(20) << "ignoring pg on deleted pool " << on << dendl;
      continue;
    }

    dout(20) << "mkpg " << on << " e" << created << "@" << ci->second << dendl;

    // is it still ours?
    vector<int> up, acting;
    int up_primary = -1;
    int acting_primary = -1;
    osdmap->pg_to_up_acting_osds(on, &up, &up_primary, &acting, &acting_primary);
    int role = osdmap->calc_pg_role(whoami, acting, acting.size());

    if (acting_primary != whoami) {
      dout(10) << "mkpg " << on << "  not acting_primary (" << acting_primary
               << "), my role=" << role << ", skipping" << dendl;
      continue;
    }

    spg_t pgid;
    bool mapped = osdmap->get_primary_shard(on, &pgid);
    assert(mapped);

    PastIntervals pi(
      osdmap->get_pools().at(pgid.pool()).ec_pool(),
      *osdmap);
    pg_history_t history;
    build_initial_pg_history(pgid, created, ci->second, &history, &pi);

    // The mon won't resend unless the primary changed, so
    // we ignore same_interval_since.  We'll pass this history
    // to handle_pg_peering_evt with the current epoch as the
    // event -- the project_pg_history check in
    // handle_pg_peering_evt will be a noop.
    if (history.same_primary_since > m->epoch) {
      dout(10) << __func__ << ": got obsolete pg create on pgid "
               << pgid << " from epoch " << m->epoch
               << ", primary changed in " << history.same_primary_since
               << dendl;
      continue;
    }

    if (handle_pg_peering_evt(
          pgid,
          history,
          pi,
          osdmap->get_epoch(),
          PG::CephPeeringEvtRef(
            new PG::CephPeeringEvt(
              osdmap->get_epoch(),
              osdmap->get_epoch(),
              PG::NullEvt()))
          ) == -EEXIST) {
      service.send_pg_created(pgid.pgid);
    }
  }
  last_pg_create_epoch = m->epoch;

  maybe_update_heartbeat_peers();
}


// ----------------------------------------
// peering and recovery

PG::RecoveryCtx OSD::create_context()
{
  ObjectStore::Transaction *t = new ObjectStore::Transaction;
  C_Contexts *on_applied = new C_Contexts(cct);
  C_Contexts *on_safe = new C_Contexts(cct);
  map<int, map<spg_t,pg_query_t> > *query_map =
    new map<int, map<spg_t, pg_query_t> >;
  map<int,vector<pair<pg_notify_t, PastIntervals> > > *notify_list =
    new map<int, vector<pair<pg_notify_t, PastIntervals> > >;
  map<int,vector<pair<pg_notify_t, PastIntervals> > > *info_map =
    new map<int,vector<pair<pg_notify_t, PastIntervals> > >;
  PG::RecoveryCtx rctx(query_map, info_map, notify_list,
                       on_applied, on_safe, t);
  return rctx;
}

struct C_OpenPGs : public Context {
  set<PGRef> pgs;
  ObjectStore *store;
  OSD *osd;
  C_OpenPGs(set<PGRef>& p, ObjectStore *s, OSD* o) : store(s), osd(o) {
    pgs.swap(p);
  }
  void finish(int r) override {
    RWLock::RLocker l(osd->pg_map_lock);
    for (auto p : pgs) {
      if (osd->pg_map.count(p->info.pgid)) {
        p->ch = store->open_collection(p->coll);
        assert(p->ch);
      }
    }
  }
};

void OSD::dispatch_context_transaction(PG::RecoveryCtx &ctx, PG *pg,
                                       ThreadPool::TPHandle *handle)
{
  if (!ctx.transaction->empty()) {
    if (!ctx.created_pgs.empty()) {
      ctx.on_applied->add(new C_OpenPGs(ctx.created_pgs, store, this));
    }
    int tr = store->queue_transaction(
      pg->osr.get(),
      std::move(*ctx.transaction), ctx.on_applied, ctx.on_safe, NULL,
      TrackedOpRef(), handle);
    delete (ctx.transaction);
    assert(tr == 0);
    ctx.transaction = new ObjectStore::Transaction;
    ctx.on_applied = new C_Contexts(cct);
    ctx.on_safe = new C_Contexts(cct);
  }
}

void OSD::dispatch_context(PG::RecoveryCtx &ctx, PG *pg, OSDMapRef curmap,
                           ThreadPool::TPHandle *handle)
{
  if (service.get_osdmap()->is_up(whoami) &&
      is_active()) {
    do_notifies(*ctx.notify_list, curmap);
    do_queries(*ctx.query_map, curmap);
    do_infos(*ctx.info_map, curmap);
  }
  delete ctx.notify_list;
  delete ctx.query_map;
  delete ctx.info_map;
  if ((ctx.on_applied->empty() &&
       ctx.on_safe->empty() &&
       ctx.transaction->empty() &&
       ctx.created_pgs.empty()) || !pg) {
    delete ctx.transaction;
    delete ctx.on_applied;
    delete ctx.on_safe;
    assert(ctx.created_pgs.empty());
  } else {
    if (!ctx.created_pgs.empty()) {
      ctx.on_applied->add(new C_OpenPGs(ctx.created_pgs, store, this));
    }
    int tr = store->queue_transaction(
      pg->osr.get(),
      std::move(*ctx.transaction), ctx.on_applied, ctx.on_safe, NULL, TrackedOpRef(),
      handle);
    delete (ctx.transaction);
    assert(tr == 0);
  }
}

/** do_notifies
 * Send an MOSDPGNotify to a primary, with a list of PGs that I have
 * content for, and they are primary for.
 */

void OSD::do_notifies(
  map<int,vector<pair<pg_notify_t,PastIntervals> > >& notify_list,
  OSDMapRef curmap)
{
  for (map<int,
           vector<pair<pg_notify_t,PastIntervals> > >::iterator it =
         notify_list.begin();
       it != notify_list.end();
       ++it) {
    if (!curmap->is_up(it->first)) {
      dout(20) << __func__ << " skipping down osd." << it->first << dendl;
      continue;
    }
    ConnectionRef con = service.get_con_osd_cluster(
      it->first, curmap->get_epoch());
    if (!con) {
      dout(20) << __func__ << " skipping osd." << it->first
               << " (NULL con)" << dendl;
      continue;
    }
    service.share_map_peer(it->first, con.get(), curmap);
    dout(7) << __func__ << " osd " << it->first
            << " on " << it->second.size() << " PGs" << dendl;
    MOSDPGNotify *m = new MOSDPGNotify(curmap->get_epoch(),
                                       it->second);
    con->send_message(m);
  }
}


/** do_queries
 * send out pending queries for info | summaries
 */
void OSD::do_queries(map<int, map<spg_t,pg_query_t> >& query_map,
                     OSDMapRef curmap)
{
  for (map<int, map<spg_t,pg_query_t> >::iterator pit = query_map.begin();
       pit != query_map.end();
       ++pit) {
    if (!curmap->is_up(pit->first)) {
      dout(20) << __func__ << " skipping down osd." << pit->first << dendl;
      continue;
    }
    int who = pit->first;
    ConnectionRef con = service.get_con_osd_cluster(who, curmap->get_epoch());
    if (!con) {
      dout(20) << __func__ << " skipping osd." << who
               << " (NULL con)" << dendl;
      continue;
    }
    service.share_map_peer(who, con.get(), curmap);
    dout(7) << __func__ << " querying osd." << who
            << " on " << pit->second.size() << " PGs" << dendl;
    MOSDPGQuery *m = new MOSDPGQuery(curmap->get_epoch(), pit->second);
    con->send_message(m);
  }
}


void OSD::do_infos(map<int,
                       vector<pair<pg_notify_t, PastIntervals> > >& info_map,
                   OSDMapRef curmap)
{
  for (map<int,
           vector<pair<pg_notify_t, PastIntervals> > >::iterator p =
         info_map.begin();
       p != info_map.end();
       ++p) {
    if (!curmap->is_up(p->first)) {
      dout(20) << __func__ << " skipping down osd." << p->first << dendl;
      continue;
    }
    for (vector<pair<pg_notify_t,PastIntervals> >::iterator i = p->second.begin();
         i != p->second.end();
         ++i) {
      dout(20) << __func__ << " sending info " << i->first.info
               << " to shard " << p->first << dendl;
    }
    ConnectionRef con = service.get_con_osd_cluster(
      p->first, curmap->get_epoch());
    if (!con) {
      dout(20) << __func__ << " skipping osd." << p->first
               << " (NULL con)" << dendl;
      continue;
    }
    service.share_map_peer(p->first, con.get(), curmap);
    MOSDPGInfo *m = new MOSDPGInfo(curmap->get_epoch());
    m->pg_list = p->second;
    con->send_message(m);
  }
  info_map.clear();
}


/** PGNotify
 * from non-primary to primary
 * includes pg_info_t.
 * NOTE: called with opqueue active.
 */
void OSD::handle_pg_notify(OpRequestRef op)
{
  const MOSDPGNotify *m = static_cast<const MOSDPGNotify*>(op->get_req());
  assert(m->get_type() == MSG_OSD_PG_NOTIFY);

  dout(7) << "handle_pg_notify from " << m->get_source() << dendl;
  int from = m->get_source().num();

  if (!require_osd_peer(op->get_req()))
    return;

  if (!require_same_or_newer_map(op, m->get_epoch(), false))
    return;

  op->mark_started();

  for (auto it = m->get_pg_list().begin();
       it != m->get_pg_list().end();
       ++it) {
    if (it->first.info.pgid.preferred() >= 0) {
      dout(20) << "ignoring localized pg " << it->first.info.pgid << dendl;
      continue;
    }

    handle_pg_peering_evt(
      spg_t(it->first.info.pgid.pgid, it->first.to),
      it->first.info.history, it->second,
      it->first.query_epoch,
      PG::CephPeeringEvtRef(
        new PG::CephPeeringEvt(
          it->first.epoch_sent, it->first.query_epoch,
          PG::MNotifyRec(pg_shard_t(from, it->first.from), it->first,
          op->get_req()->get_connection()->get_features())))
      );
  }
}

void OSD::handle_pg_log(OpRequestRef op)
{
  MOSDPGLog *m = static_cast<MOSDPGLog*>(op->get_nonconst_req());
  assert(m->get_type() == MSG_OSD_PG_LOG);
  dout(7) << "handle_pg_log " << *m << " from " << m->get_source() << dendl;

  if (!require_osd_peer(op->get_req()))
    return;

  int from = m->get_source().num();
  if (!require_same_or_newer_map(op, m->get_epoch(), false))
    return;

  if (m->info.pgid.preferred() >= 0) {
    dout(10) << "ignoring localized pg " << m->info.pgid << dendl;
    return;
  }

  op->mark_started();
  handle_pg_peering_evt(
    spg_t(m->info.pgid.pgid, m->to),
    m->info.history, m->past_intervals, m->get_epoch(),
    PG::CephPeeringEvtRef(
      new PG::CephPeeringEvt(
        m->get_epoch(), m->get_query_epoch(),
        PG::MLogRec(pg_shard_t(from, m->from), m)))
    );
}

void OSD::handle_pg_info(OpRequestRef op)
{
  const MOSDPGInfo *m = static_cast<const MOSDPGInfo *>(op->get_req());
  assert(m->get_type() == MSG_OSD_PG_INFO);
  dout(7) << "handle_pg_info " << *m << " from " << m->get_source() << dendl;

  if (!require_osd_peer(op->get_req()))
    return;

  int from = m->get_source().num();
  if (!require_same_or_newer_map(op, m->get_epoch(), false))
    return;

  op->mark_started();

  for (auto p = m->pg_list.begin();
       p != m->pg_list.end();
       ++p) {
    if (p->first.info.pgid.preferred() >= 0) {
      dout(10) << "ignoring localized pg " << p->first.info.pgid << dendl;
      continue;
    }

    handle_pg_peering_evt(
      spg_t(p->first.info.pgid.pgid, p->first.to),
      p->first.info.history, p->second, p->first.epoch_sent,
      PG::CephPeeringEvtRef(
        new PG::CephPeeringEvt(
          p->first.epoch_sent, p->first.query_epoch,
          PG::MInfoRec(
            pg_shard_t(
              from, p->first.from), p->first.info, p->first.epoch_sent)))
      );
  }
}

void OSD::handle_pg_trim(OpRequestRef op)
{
  const MOSDPGTrim *m = static_cast<const MOSDPGTrim*>(op->get_req());
  assert(m->get_type() == MSG_OSD_PG_TRIM);

  dout(7) << "handle_pg_trim " << *m << " from " << m->get_source() << dendl;

  if (!require_osd_peer(op->get_req()))
    return;

  int from = m->get_source().num();
  if (!require_same_or_newer_map(op, m->epoch, false))
    return;

  if (m->pgid.preferred() >= 0) {
    dout(10) << "ignoring localized pg " << m->pgid << dendl;
    return;
  }

  op->mark_started();

  PG *pg = _lookup_lock_pg(m->pgid);
  if(!pg) {
    dout(10) << " don't have pg " << m->pgid << dendl;
    return;
  }

  if (m->epoch < pg->info.history.same_interval_since) {
    dout(10) << *pg << " got old trim to " << m->trim_to << ", ignoring" << dendl;
    pg->unlock();
    return;
  }

  if (pg->is_primary()) {
    // peer is informing us of their last_complete_ondisk
    dout(10) << *pg << " replica osd." << from << " lcod " << m->trim_to << dendl;
    pg->peer_last_complete_ondisk[pg_shard_t(from, m->pgid.shard)] =
      m->trim_to;
    // trim log when the pg is recovered
    pg->calc_min_last_complete_ondisk();
  } else {
    // primary is instructing us to trim
    ObjectStore::Transaction t;
    pg->pg_log.trim(m->trim_to, pg->info);
    pg->dirty_info = true;
    pg->write_if_dirty(t);
    int tr = store->queue_transaction(pg->osr.get(), std::move(t), NULL);
    assert(tr == 0);
  }
  pg->unlock();
}

void OSD::handle_pg_backfill_reserve(OpRequestRef op)
{
  const MBackfillReserve *m = static_cast<const MBackfillReserve*>(op->get_req());
  assert(m->get_type() == MSG_OSD_BACKFILL_RESERVE);

  if (!require_osd_peer(op->get_req()))
    return;
  if (!require_same_or_newer_map(op, m->query_epoch, false))
    return;

  PG::CephPeeringEvtRef evt;
  if (m->type == MBackfillReserve::REQUEST) {
    evt = PG::CephPeeringEvtRef(
      new PG::CephPeeringEvt(
        m->query_epoch,
        m->query_epoch,
        PG::RequestBackfillPrio(m->priority)));
  } else if (m->type == MBackfillReserve::GRANT) {
    evt = PG::CephPeeringEvtRef(
      new PG::CephPeeringEvt(
        m->query_epoch,
        m->query_epoch,
        PG::RemoteBackfillReserved()));
  } else if (m->type == MBackfillReserve::REJECT) {
    evt = PG::CephPeeringEvtRef(
      new PG::CephPeeringEvt(
        m->query_epoch,
        m->query_epoch,
        PG::RemoteReservationRejected()));
  } else {
    ceph_abort();
  }

  if (service.splitting(m->pgid)) {
    peering_wait_for_split[m->pgid].push_back(evt);
    return;
  }

  PG *pg = _lookup_lock_pg(m->pgid);
  if (!pg) {
    dout(10) << " don't have pg " << m->pgid << dendl;
    return;
  }

  pg->queue_peering_event(evt);
  pg->unlock();
}

void OSD::handle_pg_recovery_reserve(OpRequestRef op)
{
  const MRecoveryReserve *m = static_cast<const MRecoveryReserve*>(op->get_req());
  assert(m->get_type() == MSG_OSD_RECOVERY_RESERVE);

  if (!require_osd_peer(op->get_req()))
    return;
  if (!require_same_or_newer_map(op, m->query_epoch, false))
    return;

  PG::CephPeeringEvtRef evt;
  if (m->type == MRecoveryReserve::REQUEST) {
    evt = PG::CephPeeringEvtRef(
      new PG::CephPeeringEvt(
        m->query_epoch,
        m->query_epoch,
        PG::RequestRecovery()));
  } else if (m->type == MRecoveryReserve::GRANT) {
    evt = PG::CephPeeringEvtRef(
      new PG::CephPeeringEvt(
        m->query_epoch,
        m->query_epoch,
        PG::RemoteRecoveryReserved()));
  } else if (m->type == MRecoveryReserve::RELEASE) {
    evt = PG::CephPeeringEvtRef(
      new PG::CephPeeringEvt(
        m->query_epoch,
        m->query_epoch,
        PG::RecoveryDone()));
  } else {
    ceph_abort();
  }

  if (service.splitting(m->pgid)) {
    peering_wait_for_split[m->pgid].push_back(evt);
    return;
  }

  PG *pg = _lookup_lock_pg(m->pgid);
  if (!pg) {
    dout(10) << " don't have pg " << m->pgid << dendl;
    return;
  }

  pg->queue_peering_event(evt);
  pg->unlock();
}


/** PGQuery
 * from primary to replica | stray
 * NOTE: called with opqueue active.
 */
void OSD::handle_pg_query(OpRequestRef op)
{
  assert(osd_lock.is_locked());

  const MOSDPGQuery *m = static_cast<const MOSDPGQuery*>(op->get_req());
  assert(m->get_type() == MSG_OSD_PG_QUERY);

  if (!require_osd_peer(op->get_req()))
    return;

  dout(7) << "handle_pg_query from " << m->get_source() << " epoch " << m->get_epoch() << dendl;
  int from = m->get_source().num();

  if (!require_same_or_newer_map(op, m->get_epoch(), false))
    return;

  op->mark_started();

  map< int, vector<pair<pg_notify_t, PastIntervals> > > notify_list;

  for (auto it = m->pg_list.begin();
       it != m->pg_list.end();
       ++it) {
    spg_t pgid = it->first;

    if (pgid.preferred() >= 0) {
      dout(10) << "ignoring localized pg " << pgid << dendl;
      continue;
    }

    if (service.splitting(pgid)) {
      peering_wait_for_split[pgid].push_back(
        PG::CephPeeringEvtRef(
          new PG::CephPeeringEvt(
            it->second.epoch_sent, it->second.epoch_sent,
            PG::MQuery(pg_shard_t(from, it->second.from),
                       it->second, it->second.epoch_sent))));
      continue;
    }

    {
      RWLock::RLocker l(pg_map_lock);
      if (pg_map.count(pgid)) {
        PG *pg = 0;
        pg = _lookup_lock_pg_with_map_lock_held(pgid);
        pg->queue_query(
            it->second.epoch_sent, it->second.epoch_sent,
            pg_shard_t(from, it->second.from), it->second);
        pg->unlock();
        continue;
      }
    }

    if (!osdmap->have_pg_pool(pgid.pool()))
      continue;

    // get active crush mapping
    int up_primary, acting_primary;
    vector<int> up, acting;
    osdmap->pg_to_up_acting_osds(
      pgid.pgid, &up, &up_primary, &acting, &acting_primary);

    // same primary?
    pg_history_t history = it->second.history;
    bool valid_history = project_pg_history(
      pgid, history, it->second.epoch_sent,
      up, up_primary, acting, acting_primary);

    if (!valid_history ||
        it->second.epoch_sent < history.same_interval_since) {
      dout(10) << " pg " << pgid << " dne, and pg has changed in "
               << history.same_interval_since
               << " (msg from " << it->second.epoch_sent << ")" << dendl;
      continue;
    }

    dout(10) << " pg " << pgid << " dne" << dendl;
    pg_info_t empty(spg_t(pgid.pgid, it->second.to));
    /* This is racy, but that should be ok: if we complete the deletion
     * before the pg is recreated, we'll just start it off backfilling
     * instead of just empty */
    if (service.deleting_pgs.lookup(pgid))
      empty.set_last_backfill(hobject_t());
    if (it->second.type == pg_query_t::LOG ||
        it->second.type == pg_query_t::FULLLOG) {
      ConnectionRef con = service.get_con_osd_cluster(from, osdmap->get_epoch());
      if (con) {
        MOSDPGLog *mlog = new MOSDPGLog(
          it->second.from, it->second.to,
          osdmap->get_epoch(), empty,
          it->second.epoch_sent);
        service.share_map_peer(from, con.get(), osdmap);
        con->send_message(mlog);
      }
    } else {
      notify_list[from].push_back(
        make_pair(
          pg_notify_t(
            it->second.from, it->second.to,
            it->second.epoch_sent,
            osdmap->get_epoch(),
            empty),
          PastIntervals(
            osdmap->get_pools().at(pgid.pool()).ec_pool(),
            *osdmap)));
    }
  }
  do_notifies(notify_list, osdmap);
}


void OSD::handle_pg_remove(OpRequestRef op)
{
  const MOSDPGRemove *m = static_cast<const MOSDPGRemove *>(op->get_req());
  assert(m->get_type() == MSG_OSD_PG_REMOVE);
  assert(osd_lock.is_locked());

  if (!require_osd_peer(op->get_req()))
    return;

  dout(7) << "handle_pg_remove from " << m->get_source() << " on "
          << m->pg_list.size() << " pgs" << dendl;

  if (!require_same_or_newer_map(op, m->get_epoch(), false))
    return;

  op->mark_started();

  for (auto it = m->pg_list.begin();
       it != m->pg_list.end();
       ++it) {
    spg_t pgid = *it;
    if (pgid.preferred() >= 0) {
      dout(10) << "ignoring localized pg " << pgid << dendl;
      continue;
    }

    RWLock::WLocker l(pg_map_lock);
    if (pg_map.count(pgid) == 0) {
      dout(10) << " don't have pg " << pgid << dendl;
      continue;
    }
    dout(5) << "queue_pg_for_deletion: " << pgid << dendl;
    PG *pg = _lookup_lock_pg_with_map_lock_held(pgid);
    pg_history_t history = pg->info.history;
    int up_primary, acting_primary;
    vector<int> up, acting;
    osdmap->pg_to_up_acting_osds(
      pgid.pgid, &up, &up_primary, &acting, &acting_primary);
    bool valid_history = project_pg_history(
      pg->info.pgid, history, pg->get_osdmap()->get_epoch(),
      up, up_primary, acting, acting_primary);
    if (valid_history &&
        history.same_interval_since <= m->get_epoch()) {
      assert(pg->get_primary().osd == m->get_source().num());
      PGRef _pg(pg);
      _remove_pg(pg);
      pg->unlock();
    } else {
      dout(10) << *pg << " ignoring remove request, pg changed in epoch "
               << history.same_interval_since
               << " > " << m->get_epoch() << dendl;
      pg->unlock();
    }
  }
}

void OSD::_remove_pg(PG *pg)
{
  ObjectStore::Transaction rmt ;

  // on_removal, which calls remove_watchers_and_notifies, and the erasure from
  // the pg_map must be done together without unlocking the pg lock,
  // to avoid racing with watcher cleanup in ms_handle_reset
  // and handle_notify_timeout
  pg->on_removal(&rmt);

  service.cancel_pending_splits_for_parent(pg->info.pgid);
  int tr = store->queue_transaction(
    pg->osr.get(), std::move(rmt), NULL, 
    new ContainerContext<
      SequencerRef>(pg->osr));
  assert(tr == 0);

  DeletingStateRef deleting = service.deleting_pgs.lookup_or_create(
    pg->info.pgid,
    make_pair(
      pg->info.pgid,
      PGRef(pg))
    );
  remove_wq.queue(make_pair(PGRef(pg), deleting));

  service.pg_remove_epoch(pg->info.pgid);

  // dereference from op_wq
  op_shardedwq.clear_pg_pointer(pg->info.pgid);

  // remove from map
  pg_map.erase(pg->info.pgid);
  pg->put("PGMap"); // since we've taken it out of map
}


// =========================================================
// RECOVERY

void OSDService::_maybe_queue_recovery() {
  assert(recovery_lock.is_locked_by_me());
  uint64_t available_pushes;
  while (!awaiting_throttle.empty() &&
         _recover_now(&available_pushes)) {
    uint64_t to_start = MIN(
      available_pushes,
      cct->_conf->osd_recovery_max_single_start);
    _queue_for_recovery(awaiting_throttle.front(), to_start);
    awaiting_throttle.pop_front();
    recovery_ops_reserved += to_start;
  }
}

bool OSDService::_recover_now(uint64_t *available_pushes)
{
  if (available_pushes)
      *available_pushes = 0;

  if (ceph_clock_now() < defer_recovery_until) {
    dout(15) << __func__ << " defer until " << defer_recovery_until << dendl;
    return false;
  }

  if (recovery_paused) {
    dout(15) << __func__ << " paused" << dendl;
    return false;
  }

  uint64_t max = cct->_conf->osd_recovery_max_active;
  if (max <= recovery_ops_active + recovery_ops_reserved) {
    dout(15) << __func__ << " active " << recovery_ops_active
             << " + reserved " << recovery_ops_reserved
             << " >= max " << max << dendl;
    return false;
  }

  if (available_pushes)
    *available_pushes = max - recovery_ops_active - recovery_ops_reserved;

  return true;
}

void OSD::do_recovery(
  PG *pg, epoch_t queued, uint64_t reserved_pushes,
  ThreadPool::TPHandle &handle)
{
  uint64_t started = 0;

  /*
   * When the value of osd_recovery_sleep is set greater than zero, recovery
   * ops are scheduled after osd_recovery_sleep amount of time from the previous
   * recovery event's schedule time. This is done by adding a
   * recovery_requeue_callback event, which re-queues the recovery op using
   * queue_recovery_after_sleep.
   */
  if (cct->_conf->osd_recovery_sleep > 0 && service.recovery_needs_sleep) {
    PGRef pgref(pg);
    auto recovery_requeue_callback = new FunctionContext([this, pgref, queued, reserved_pushes](int r) {
      dout(20) << "do_recovery wake up at "
               << ceph_clock_now()
               << ", re-queuing recovery" << dendl;
      service.recovery_needs_sleep = false;
      service.queue_recovery_after_sleep(pgref.get(), queued, reserved_pushes);
    });
    Mutex::Locker l(service.recovery_sleep_lock);

    // This is true for the first recovery op and when the previous recovery op
    // has been scheduled in the past. The next recovery op is scheduled after
    // completing the sleep from now.
    if (service.recovery_schedule_time < ceph_clock_now()) {
      service.recovery_schedule_time = ceph_clock_now();
    }
    service.recovery_schedule_time += cct->_conf->osd_recovery_sleep;
    service.recovery_sleep_timer.add_event_at(service.recovery_schedule_time,
                                              recovery_requeue_callback);
    dout(20) << "Recovery event scheduled at "
             << service.recovery_schedule_time << dendl;
    return;
  }

  {
    service.recovery_needs_sleep = true;
    if (pg->pg_has_reset_since(queued)) {
      goto out;
    }

    assert(!pg->deleting);
    assert(pg->is_peered() && pg->is_primary());

    assert(pg->recovery_queued);
    pg->recovery_queued = false;

    dout(10) << "do_recovery starting " << reserved_pushes << " " << *pg << dendl;
#ifdef DEBUG_RECOVERY_OIDS
    dout(20) << "  active was " << service.recovery_oids[pg->info.pgid] << dendl;
#endif

    bool more = pg->start_recovery_ops(reserved_pushes, handle, &started);
    dout(10) << "do_recovery started " << started << "/" << reserved_pushes 
             << " on " << *pg << dendl;

    // If no recovery op is started, don't bother to manipulate the RecoveryCtx
    if (!started && (more || !pg->have_unfound())) {
      goto out;
    }

    PG::RecoveryCtx rctx = create_context();
    rctx.handle = &handle;

    /*
     * if we couldn't start any recovery ops and things are still
     * unfound, see if we can discover more missing object locations.
     * It may be that our initial locations were bad and we errored
     * out while trying to pull.
     */
    if (!more && pg->have_unfound()) {
      pg->discover_all_missing(*rctx.query_map);
      if (rctx.query_map->empty()) {
        string action;
        if (pg->state_test(PG_STATE_BACKFILL)) {
          auto evt = PG::CephPeeringEvtRef(new PG::CephPeeringEvt(
            queued,
            queued,
            PG::CancelBackfill()));
          pg->queue_peering_event(evt);
          action = "in backfill";
        } else if (pg->state_test(PG_STATE_RECOVERING)) {
          auto evt = PG::CephPeeringEvtRef(new PG::CephPeeringEvt(
            queued,
            queued,
            PG::CancelRecovery()));
          pg->queue_peering_event(evt);
          action = "in recovery";
        } else {
          action = "already out of recovery/backfill";
        }
        dout(10) << __func__ << ": no luck, giving up on this pg for now (" << action << ")" << dendl;
      } else {
        dout(10) << __func__ << ": no luck, giving up on this pg for now (queue_recovery)" << dendl;
        pg->queue_recovery();
      }
    }

    pg->write_if_dirty(*rctx.transaction);
    OSDMapRef curmap = pg->get_osdmap();
    dispatch_context(rctx, pg, curmap);
  }

 out:
  assert(started <= reserved_pushes);
  service.release_reserved_pushes(reserved_pushes);
}

void OSDService::start_recovery_op(PG *pg, const hobject_t& soid)
{
  Mutex::Locker l(recovery_lock);
  dout(10) << "start_recovery_op " << *pg << " " << soid
           << " (" << recovery_ops_active << "/"
           << cct->_conf->osd_recovery_max_active << " rops)"
           << dendl;
  recovery_ops_active++;

#ifdef DEBUG_RECOVERY_OIDS
  dout(20) << "  active was " << recovery_oids[pg->info.pgid] << dendl;
  assert(recovery_oids[pg->info.pgid].count(soid) == 0);
  recovery_oids[pg->info.pgid].insert(soid);
#endif
}

void OSDService::finish_recovery_op(PG *pg, const hobject_t& soid, bool dequeue)
{
  Mutex::Locker l(recovery_lock);
  dout(10) << "finish_recovery_op " << *pg << " " << soid
           << " dequeue=" << dequeue
           << " (" << recovery_ops_active << "/" << cct->_conf->osd_recovery_max_active << " rops)"
           << dendl;

  // adjust count
  assert(recovery_ops_active > 0);
  recovery_ops_active--;

#ifdef DEBUG_RECOVERY_OIDS
  dout(20) << "  active oids was " << recovery_oids[pg->info.pgid] << dendl;
  assert(recovery_oids[pg->info.pgid].count(soid));
  recovery_oids[pg->info.pgid].erase(soid);
#endif

  _maybe_queue_recovery();
}

bool OSDService::is_recovery_active()
{
  Mutex::Locker l(recovery_lock);
  return recovery_ops_active > 0;
}

// =========================================================
// OPS

bool OSD::op_is_discardable(const MOSDOp *op)
{
  // drop client request if they are not connected and can't get the
  // reply anyway.
  if (!op->get_connection()->is_connected()) {
    return true;
  }
  return false;
}

void OSD::enqueue_op(spg_t pg, OpRequestRef& op, epoch_t epoch)
{
  utime_t latency = ceph_clock_now() - op->get_req()->get_recv_stamp();
  dout(15) << "enqueue_op " << op << " prio " << op->get_req()->get_priority()
           << " cost " << op->get_req()->get_cost()
           << " latency " << latency
           << " epoch " << epoch
           << " " << *(op->get_req()) << dendl;
  op->osd_trace.event("enqueue op");
  op->osd_trace.keyval("priority", op->get_req()->get_priority());
  op->osd_trace.keyval("cost", op->get_req()->get_cost());
  op->mark_queued_for_pg();
  logger->tinc(l_osd_op_before_queue_op_lat, latency);
  op_shardedwq.queue(make_pair(pg, PGQueueable(op, epoch)));
}



/*
 * NOTE: dequeue called in worker thread, with pg lock
 */
void OSD::dequeue_op(
  PGRef pg, OpRequestRef op,
  ThreadPool::TPHandle &handle)
{
  FUNCTRACE();
  OID_EVENT_TRACE_WITH_MSG(op->get_req(), "DEQUEUE_OP_BEGIN", false);

  utime_t now = ceph_clock_now();
  op->set_dequeued_time(now);
  utime_t latency = now - op->get_req()->get_recv_stamp();
  dout(10) << "dequeue_op " << op << " prio " << op->get_req()->get_priority()
           << " cost " << op->get_req()->get_cost()
           << " latency " << latency
           << " " << *(op->get_req())
           << " pg " << *pg << dendl;

  logger->tinc(l_osd_op_before_dequeue_op_lat, latency);

  Session *session = static_cast<Session *>(
    op->get_req()->get_connection()->get_priv());
  if (session) {
    maybe_share_map(session, op, pg->get_osdmap());
    session->put();
  }

  if (pg->deleting)
    return;

  op->mark_reached_pg();
  op->osd_trace.event("dequeue_op");

  pg->do_request(op, handle);

  // finish
  dout(10) << "dequeue_op " << op << " finish" << dendl;
  OID_EVENT_TRACE_WITH_MSG(op->get_req(), "DEQUEUE_OP_END", false);
}


struct C_CompleteSplits : public Context {
  OSD *osd;
  set<PGRef> pgs;
  C_CompleteSplits(OSD *osd, const set<PGRef> &in)
    : osd(osd), pgs(in) {}
  void finish(int r) override {
    Mutex::Locker l(osd->osd_lock);
    if (osd->is_stopping())
      return;
    PG::RecoveryCtx rctx = osd->create_context();
    for (set<PGRef>::iterator i = pgs.begin();
         i != pgs.end();
         ++i) {
      osd->pg_map_lock.get_write();
      (*i)->lock();
      PG *pg = i->get();
      osd->add_newly_split_pg(pg, &rctx);
      if (!((*i)->deleting)) {
        set<spg_t> to_complete;
        to_complete.insert((*i)->info.pgid);
        osd->service.complete_split(to_complete);
      }
      osd->pg_map_lock.put_write();
      osd->dispatch_context_transaction(rctx, pg);
      osd->wake_pg_waiters(*i);
      (*i)->unlock();
    }

    osd->dispatch_context(rctx, 0, osd->service.get_osdmap());
  }
};

void OSD::process_peering_events(
  const list<PG*> &pgs,
  ThreadPool::TPHandle &handle
  )
{
  bool need_up_thru = false;
  epoch_t same_interval_since = 0;
  OSDMapRef curmap;
  PG::RecoveryCtx rctx = create_context();
  rctx.handle = &handle;
  for (list<PG*>::const_iterator i = pgs.begin();
       i != pgs.end();
       ++i) {
    set<PGRef> split_pgs;
    PG *pg = *i;
    pg->lock_suspend_timeout(handle);
    curmap = service.get_osdmap();
    if (pg->deleting) {
      pg->unlock();
      continue;
    }
    if (!advance_pg(curmap->get_epoch(), pg, handle, &rctx, &split_pgs)) {
      // we need to requeue the PG explicitly since we didn't actually
      // handle an event
      peering_wq.queue(pg);
    } else {
      assert(!pg->peering_queue.empty());
      PG::CephPeeringEvtRef evt = pg->peering_queue.front();
      pg->peering_queue.pop_front();
      pg->handle_peering_event(evt, &rctx);
    }
    need_up_thru = pg->need_up_thru || need_up_thru;
    same_interval_since = MAX(pg->info.history.same_interval_since,
                              same_interval_since);
    pg->write_if_dirty(*rctx.transaction);
    if (!split_pgs.empty()) {
      rctx.on_applied->add(new C_CompleteSplits(this, split_pgs));
      split_pgs.clear();
    }
    dispatch_context_transaction(rctx, pg, &handle);
    pg->unlock();
  }
  if (need_up_thru)
    queue_want_up_thru(same_interval_since);
  dispatch_context(rctx, 0, curmap, &handle);

  service.send_pg_temp();
}

// --------------------------------

const char** OSD::get_tracked_conf_keys() const
{
  static const char* KEYS[] = {
    "osd_max_backfills",
    "osd_min_recovery_priority",
    "osd_max_trimming_pgs",
    "osd_op_complaint_time",
    "osd_op_log_threshold",
    "osd_op_history_size",
    "osd_op_history_duration",
    "osd_op_history_slow_op_size",
    "osd_op_history_slow_op_threshold",
    "osd_enable_op_tracker",
    "osd_map_cache_size",
    "osd_map_max_advance",
    "osd_pg_epoch_persisted_max_stale",
    "osd_disk_thread_ioprio_class",
    "osd_disk_thread_ioprio_priority",
    // clog & admin clog
    "clog_to_monitors",
    "clog_to_syslog",
    "clog_to_syslog_facility",
    "clog_to_syslog_level",
    "osd_objectstore_fuse",
    "clog_to_graylog",
    "clog_to_graylog_host",
    "clog_to_graylog_port",
    "host",
    "fsid",
    "osd_recovery_delay_start",
    "osd_client_message_size_cap",
    "osd_client_message_cap",
    "osd_heartbeat_min_size",
    "osd_heartbeat_interval",
    NULL
  };
  return KEYS;
}

void OSD::handle_conf_change(const struct md_config_t *conf,
                             const std::set <std::string> &changed)
{
  if (changed.count("osd_max_backfills")) {
    service.local_reserver.set_max(cct->_conf->osd_max_backfills);
    service.remote_reserver.set_max(cct->_conf->osd_max_backfills);
  }
  if (changed.count("osd_min_recovery_priority")) {
    service.local_reserver.set_min_priority(cct->_conf->osd_min_recovery_priority);
    service.remote_reserver.set_min_priority(cct->_conf->osd_min_recovery_priority);
  }
  if (changed.count("osd_max_trimming_pgs")) {
    service.snap_reserver.set_max(cct->_conf->osd_max_trimming_pgs);
  }
  if (changed.count("osd_op_complaint_time") ||
      changed.count("osd_op_log_threshold")) {
    op_tracker.set_complaint_and_threshold(cct->_conf->osd_op_complaint_time,
                                           cct->_conf->osd_op_log_threshold);
  }
  if (changed.count("osd_op_history_size") ||
      changed.count("osd_op_history_duration")) {
    op_tracker.set_history_size_and_duration(cct->_conf->osd_op_history_size,
                                             cct->_conf->osd_op_history_duration);
  }
  if (changed.count("osd_op_history_slow_op_size") ||
      changed.count("osd_op_history_slow_op_threshold")) {
    op_tracker.set_history_slow_op_size_and_threshold(cct->_conf->osd_op_history_slow_op_size,
                                                      cct->_conf->osd_op_history_slow_op_threshold);
  }
  if (changed.count("osd_enable_op_tracker")) {
      op_tracker.set_tracking(cct->_conf->osd_enable_op_tracker);
  }
  if (changed.count("osd_disk_thread_ioprio_class") ||
      changed.count("osd_disk_thread_ioprio_priority")) {
    set_disk_tp_priority();
  }
  if (changed.count("osd_map_cache_size")) {
    service.map_cache.set_size(cct->_conf->osd_map_cache_size);
    service.map_bl_cache.set_size(cct->_conf->osd_map_cache_size);
    service.map_bl_inc_cache.set_size(cct->_conf->osd_map_cache_size);
  }
  if (changed.count("clog_to_monitors") ||
      changed.count("clog_to_syslog") ||
      changed.count("clog_to_syslog_level") ||
      changed.count("clog_to_syslog_facility") ||
      changed.count("clog_to_graylog") ||
      changed.count("clog_to_graylog_host") ||
      changed.count("clog_to_graylog_port") ||
      changed.count("host") ||
      changed.count("fsid")) {
    update_log_config();
  }

#ifdef HAVE_LIBFUSE
  if (changed.count("osd_objectstore_fuse")) {
    if (store) {
      enable_disable_fuse(false);
    }
  }
#endif

  if (changed.count("osd_recovery_delay_start")) {
    service.defer_recovery(cct->_conf->osd_recovery_delay_start);
    service.kick_recovery_queue();
  }

  if (changed.count("osd_client_message_cap")) {
    uint64_t newval = cct->_conf->osd_client_message_cap;
    Messenger::Policy pol = client_messenger->get_policy(entity_name_t::TYPE_CLIENT);
    if (pol.throttler_messages && newval > 0) {
      pol.throttler_messages->reset_max(newval);
    }
  }
  if (changed.count("osd_client_message_size_cap")) {
    uint64_t newval = cct->_conf->osd_client_message_size_cap;
    Messenger::Policy pol = client_messenger->get_policy(entity_name_t::TYPE_CLIENT);
    if (pol.throttler_bytes && newval > 0) {
      pol.throttler_bytes->reset_max(newval);
    }
  }

  check_config();
}

void OSD::update_log_config()
{
  map<string,string> log_to_monitors;
  map<string,string> log_to_syslog;
  map<string,string> log_channel;
  map<string,string> log_prio;
  map<string,string> log_to_graylog;
  map<string,string> log_to_graylog_host;
  map<string,string> log_to_graylog_port;
  uuid_d fsid;
  string host;

  if (parse_log_client_options(cct, log_to_monitors, log_to_syslog,
                               log_channel, log_prio, log_to_graylog,
                               log_to_graylog_host, log_to_graylog_port,
                               fsid, host) == 0)
    clog->update_config(log_to_monitors, log_to_syslog,
                        log_channel, log_prio, log_to_graylog,
                        log_to_graylog_host, log_to_graylog_port,
                        fsid, host);
  derr << "log_to_monitors " << log_to_monitors << dendl;
}

void OSD::check_config()
{
  // some sanity checks
  if (cct->_conf->osd_map_cache_size <= cct->_conf->osd_map_max_advance + 2) {
    clog->warn() << "osd_map_cache_size (" << cct->_conf->osd_map_cache_size << ")"
                << " is not > osd_map_max_advance ("
                << cct->_conf->osd_map_max_advance << ")";
  }
  if (cct->_conf->osd_map_cache_size <= (int)cct->_conf->osd_pg_epoch_persisted_max_stale + 2) {
    clog->warn() << "osd_map_cache_size (" << cct->_conf->osd_map_cache_size << ")"
                 << " is not > osd_pg_epoch_persisted_max_stale ("
                 << cct->_conf->osd_pg_epoch_persisted_max_stale << ")";
  }
}

void OSD::set_disk_tp_priority()
{
  dout(10) << __func__
           << " class " << cct->_conf->osd_disk_thread_ioprio_class
           << " priority " << cct->_conf->osd_disk_thread_ioprio_priority
           << dendl;
  if (cct->_conf->osd_disk_thread_ioprio_class.empty() ||
      cct->_conf->osd_disk_thread_ioprio_priority < 0)
    return;
  int cls =
    ceph_ioprio_string_to_class(cct->_conf->osd_disk_thread_ioprio_class);
  if (cls < 0)
    derr << __func__ << cpp_strerror(cls) << ": "
         << "osd_disk_thread_ioprio_class is " << cct->_conf->osd_disk_thread_ioprio_class
         << " but only the following values are allowed: idle, be or rt" << dendl;
  else
    disk_tp.set_ioprio(cls, cct->_conf->osd_disk_thread_ioprio_priority);
}

// --------------------------------

void OSD::get_latest_osdmap()
{
  dout(10) << __func__ << " -- start" << dendl;

  C_SaferCond cond;
  service.objecter->wait_for_latest_osdmap(&cond);
  cond.wait();

  dout(10) << __func__ << " -- finish" << dendl;
}

// --------------------------------

int OSD::init_op_flags(OpRequestRef& op)
{
  const MOSDOp *m = static_cast<const MOSDOp*>(op->get_req());
  vector<OSDOp>::const_iterator iter;

  // client flags have no bearing on whether an op is a read, write, etc.
  op->rmw_flags = 0;

  if (m->has_flag(CEPH_OSD_FLAG_RWORDERED)) {
    op->set_force_rwordered();
  }

  // set bits based on op codes, called methods.
  for (iter = m->ops.begin(); iter != m->ops.end(); ++iter) {
    if ((iter->op.op == CEPH_OSD_OP_WATCH &&
         iter->op.watch.op == CEPH_OSD_WATCH_OP_PING)) {
      /* This a bit odd.  PING isn't actually a write.  It can't
       * result in an update to the object_info.  PINGs also aren'ty
       * resent, so there's no reason to write out a log entry
       *
       * However, we pipeline them behind writes, so let's force
       * the write_ordered flag.
       */
      op->set_force_rwordered();
    } else {
      if (ceph_osd_op_mode_modify(iter->op.op))
        op->set_write();
    }
    if (ceph_osd_op_mode_read(iter->op.op))
      op->set_read();

    // set READ flag if there are src_oids
    if (iter->soid.oid.name.length())
      op->set_read();

    // set PGOP flag if there are PG ops
    if (ceph_osd_op_type_pg(iter->op.op))
      op->set_pg_op();

    if (ceph_osd_op_mode_cache(iter->op.op))
      op->set_cache();

    // check for ec base pool
    int64_t poolid = m->get_pg().pool();
    const pg_pool_t *pool = osdmap->get_pg_pool(poolid);
    if (pool && pool->is_tier()) {
      const pg_pool_t *base_pool = osdmap->get_pg_pool(pool->tier_of);
      if (base_pool && base_pool->require_rollback()) {
        if ((iter->op.op != CEPH_OSD_OP_READ) &&
            (iter->op.op != CEPH_OSD_OP_CHECKSUM) &&
            (iter->op.op != CEPH_OSD_OP_STAT) &&
            (iter->op.op != CEPH_OSD_OP_ISDIRTY) &&
            (iter->op.op != CEPH_OSD_OP_UNDIRTY) &&
            (iter->op.op != CEPH_OSD_OP_GETXATTR) &&
            (iter->op.op != CEPH_OSD_OP_GETXATTRS) &&
            (iter->op.op != CEPH_OSD_OP_CMPXATTR) &&
            (iter->op.op != CEPH_OSD_OP_ASSERT_VER) &&
            (iter->op.op != CEPH_OSD_OP_LIST_WATCHERS) &&
            (iter->op.op != CEPH_OSD_OP_LIST_SNAPS) &&
            (iter->op.op != CEPH_OSD_OP_SETALLOCHINT) &&
            (iter->op.op != CEPH_OSD_OP_WRITEFULL) &&
            (iter->op.op != CEPH_OSD_OP_ROLLBACK) &&
            (iter->op.op != CEPH_OSD_OP_CREATE) &&
            (iter->op.op != CEPH_OSD_OP_DELETE) &&
            (iter->op.op != CEPH_OSD_OP_SETXATTR) &&
            (iter->op.op != CEPH_OSD_OP_RMXATTR) &&
            (iter->op.op != CEPH_OSD_OP_STARTSYNC) &&
            (iter->op.op != CEPH_OSD_OP_COPY_GET) &&
            (iter->op.op != CEPH_OSD_OP_COPY_FROM)) {
          op->set_promote();
        }
      }
    }

    switch (iter->op.op) {
    case CEPH_OSD_OP_CALL:
      {
        bufferlist::iterator bp = const_cast<bufferlist&>(iter->indata).begin();
        int is_write, is_read;
        string cname, mname;
        bp.copy(iter->op.cls.class_len, cname);
        bp.copy(iter->op.cls.method_len, mname);

        ClassHandler::ClassData *cls;
        int r = class_handler->open_class(cname, &cls);
        if (r) {
          derr << "class " << cname << " open got " << cpp_strerror(r) << dendl;
          if (r == -ENOENT)
            r = -EOPNOTSUPP;
          else if (r != -EPERM) // propagate permission errors
            r = -EIO;
          return r;
        }
        int flags = cls->get_method_flags(mname.c_str());
        if (flags < 0) {
          if (flags == -ENOENT)
            r = -EOPNOTSUPP;
          else
            r = flags;
          return r;
        }
        is_read = flags & CLS_METHOD_RD;
        is_write = flags & CLS_METHOD_WR;
        bool is_promote = flags & CLS_METHOD_PROMOTE;

        dout(10) << "class " << cname << " method " << mname << " "
                 << "flags=" << (is_read ? "r" : "")
                             << (is_write ? "w" : "")
                             << (is_promote ? "p" : "")
                 << dendl;
        if (is_read)
          op->set_class_read();
        if (is_write)
          op->set_class_write();
        if (is_promote)
          op->set_promote();
        op->add_class(cname, is_read, is_write, cls->whitelisted);
        break;
      }

    case CEPH_OSD_OP_WATCH:
      // force the read bit for watch since it is depends on previous
      // watch state (and may return early if the watch exists) or, in
      // the case of ping, is simply a read op.
      op->set_read();
      // fall through
    case CEPH_OSD_OP_NOTIFY:
    case CEPH_OSD_OP_NOTIFY_ACK:
      {
        op->set_promote();
        break;
      }

    case CEPH_OSD_OP_DELETE:
      // if we get a delete with FAILOK we can skip handle cache. without
      // FAILOK we still need to promote (or do something smarter) to
      // determine whether to return ENOENT or 0.
      if (iter == m->ops.begin() &&
          iter->op.flags == CEPH_OSD_OP_FLAG_FAILOK) {
        op->set_skip_handle_cache();
      }
      // skip promotion when proxying a delete op
      if (m->ops.size() == 1) {
        op->set_skip_promote();
      }
      break;

    case CEPH_OSD_OP_CACHE_TRY_FLUSH:
    case CEPH_OSD_OP_CACHE_FLUSH:
    case CEPH_OSD_OP_CACHE_EVICT:
      // If try_flush/flush/evict is the only op, can skip handle cache.
      if (m->ops.size() == 1) {
        op->set_skip_handle_cache();
      }
      break;

    case CEPH_OSD_OP_READ:
    case CEPH_OSD_OP_SYNC_READ:
    case CEPH_OSD_OP_SPARSE_READ:
    case CEPH_OSD_OP_CHECKSUM:
    case CEPH_OSD_OP_WRITEFULL:
      if (m->ops.size() == 1 &&
          (iter->op.flags & CEPH_OSD_OP_FLAG_FADVISE_NOCACHE ||
           iter->op.flags & CEPH_OSD_OP_FLAG_FADVISE_DONTNEED)) {
        op->set_skip_promote();
      }
      break;

    // force promotion when pin an object in cache tier
    case CEPH_OSD_OP_CACHE_PIN:
      op->set_promote();
      break;

    default:
      break;
    }
  }

  if (op->rmw_flags == 0)
    return -EINVAL;

  return 0;
}

void OSD::PeeringWQ::_dequeue(list<PG*> *out) {
  for (list<PG*>::iterator i = peering_queue.begin();
      i != peering_queue.end() &&
      out->size() < osd->cct->_conf->osd_peering_wq_batch_size;
      ) {
        if (in_use.count(*i)) {
          ++i;
        } else {
          out->push_back(*i);
          peering_queue.erase(i++);
        }
  }
  in_use.insert(out->begin(), out->end());
}


// =============================================================

#undef dout_context
#define dout_context osd->cct
#undef dout_prefix
#define dout_prefix *_dout << "osd." << osd->whoami << " op_wq "

void OSD::ShardedOpWQ::wake_pg_waiters(spg_t pgid)
{
  uint32_t shard_index = pgid.hash_to_shard(shard_list.size());
  auto sdata = shard_list[shard_index];
  bool queued = false;
  unsigned pushes_to_free = 0;
  {
    Mutex::Locker l(sdata->sdata_op_ordering_lock);
    auto p = sdata->pg_slots.find(pgid);
    if (p != sdata->pg_slots.end()) {
      dout(20) << __func__ << " " << pgid
               << " to_process " << p->second.to_process
               << " waiting_for_pg=" << (int)p->second.waiting_for_pg << dendl;
      for (auto i = p->second.to_process.rbegin();
           i != p->second.to_process.rend();
           ++i) {
        sdata->_enqueue_front(make_pair(pgid, *i), osd->op_prio_cutoff);
      }
      for (auto& q : p->second.to_process) {
        pushes_to_free += q.get_reserved_pushes();
      }
      p->second.to_process.clear();
      p->second.waiting_for_pg = false;
      ++p->second.requeue_seq;
      queued = true;
    }
  }
  if (pushes_to_free > 0) {
    osd->service.release_reserved_pushes(pushes_to_free);
  }
  if (queued) {
    sdata->sdata_lock.Lock();
    sdata->sdata_cond.SignalOne();
    sdata->sdata_lock.Unlock();
  }
}

void OSD::ShardedOpWQ::prune_pg_waiters(OSDMapRef osdmap, int whoami)
{
  unsigned pushes_to_free = 0;
  for (auto sdata : shard_list) {
    Mutex::Locker l(sdata->sdata_op_ordering_lock);
    sdata->waiting_for_pg_osdmap = osdmap;
    auto p = sdata->pg_slots.begin();
    while (p != sdata->pg_slots.end()) {
      ShardData::pg_slot& slot = p->second;
      if (!slot.to_process.empty() && slot.num_running == 0) {
        if (osdmap->is_up_acting_osd_shard(p->first, whoami)) {
          dout(20) << __func__ << "  " << p->first << " maps to us, keeping"
                   << dendl;
          ++p;
          continue;
        }
        while (!slot.to_process.empty() &&
               slot.to_process.front().get_map_epoch() <= osdmap->get_epoch()) {
          auto& qi = slot.to_process.front();
          dout(20) << __func__ << "  " << p->first
                   << " item " << qi
                   << " epoch " << qi.get_map_epoch()
                   << " <= " << osdmap->get_epoch()
                   << ", stale, dropping" << dendl;
          pushes_to_free += qi.get_reserved_pushes();
          slot.to_process.pop_front();
        }
      }
      if (slot.to_process.empty() &&
          slot.num_running == 0 &&
          !slot.pg) {
        dout(20) << __func__ << "  " << p->first << " empty, pruning" << dendl;
        p = sdata->pg_slots.erase(p);
      } else {
        ++p;
      }
    }
  }
  if (pushes_to_free > 0) {
    osd->service.release_reserved_pushes(pushes_to_free);
  }
}

void OSD::ShardedOpWQ::clear_pg_pointer(spg_t pgid)
{
  uint32_t shard_index = pgid.hash_to_shard(shard_list.size());
  auto sdata = shard_list[shard_index];
  Mutex::Locker l(sdata->sdata_op_ordering_lock);
  auto p = sdata->pg_slots.find(pgid);
  if (p != sdata->pg_slots.end()) {
    auto& slot = p->second;
    dout(20) << __func__ << " " << pgid << " pg " << slot.pg << dendl;
    assert(!slot.pg || slot.pg->deleting);
    slot.pg = nullptr;
  }
}

void OSD::ShardedOpWQ::clear_pg_slots()
{
  for (auto sdata : shard_list) {
    Mutex::Locker l(sdata->sdata_op_ordering_lock);
    sdata->pg_slots.clear();
    sdata->waiting_for_pg_osdmap.reset();
    // don't bother with reserved pushes; we are shutting down
  }
}

#undef dout_prefix
#define dout_prefix *_dout << "osd." << osd->whoami << " op_wq(" << shard_index << ") "

void OSD::ShardedOpWQ::_process(uint32_t thread_index, heartbeat_handle_d *hb)
{
  uint32_t shard_index = thread_index % num_shards;
  ShardData *sdata = shard_list[shard_index];
  assert(NULL != sdata);

  // peek at spg_t
  sdata->sdata_op_ordering_lock.Lock();
  if (sdata->pqueue->empty()) {
    dout(20) << __func__ << " empty q, waiting" << dendl;
    // optimistically sleep a moment; maybe another work item will come along.
    osd->cct->get_heartbeat_map()->reset_timeout(hb,
      osd->cct->_conf->threadpool_default_timeout, 0);
    sdata->sdata_lock.Lock();
    sdata->sdata_op_ordering_lock.Unlock();
    sdata->sdata_cond.WaitInterval(sdata->sdata_lock,
      utime_t(osd->cct->_conf->threadpool_empty_queue_max_wait, 0));
    sdata->sdata_lock.Unlock();
    sdata->sdata_op_ordering_lock.Lock();
    if (sdata->pqueue->empty()) {
      sdata->sdata_op_ordering_lock.Unlock();
      return;
    }
  }
  pair<spg_t, PGQueueable> item = sdata->pqueue->dequeue();
  if (osd->is_stopping()) {
    sdata->sdata_op_ordering_lock.Unlock();
    return;    // OSD shutdown, discard.
  }
  PGRef pg;
  uint64_t requeue_seq;
  {
    auto& slot = sdata->pg_slots[item.first];
    dout(30) << __func__ << " " << item.first
             << " to_process " << slot.to_process
             << " waiting_for_pg=" << (int)slot.waiting_for_pg << dendl;
    slot.to_process.push_back(item.second);
    // note the requeue seq now...
    requeue_seq = slot.requeue_seq;
    if (slot.waiting_for_pg) {
      // save ourselves a bit of effort
      dout(20) << __func__ << " " << item.first << " item " << item.second
               << " queued, waiting_for_pg" << dendl;
      sdata->sdata_op_ordering_lock.Unlock();
      return;
    }
    pg = slot.pg;
    dout(20) << __func__ << " " << item.first << " item " << item.second
             << " queued" << dendl;
    ++slot.num_running;
  }
  sdata->sdata_op_ordering_lock.Unlock();

  osd->service.maybe_inject_dispatch_delay();

  // [lookup +] lock pg (if we have it)
  if (!pg) {
    pg = osd->_lookup_lock_pg(item.first);
  } else {
    pg->lock();
  }

  osd->service.maybe_inject_dispatch_delay();

  boost::optional<PGQueueable> qi;

  // we don't use a Mutex::Locker here because of the
  // osd->service.release_reserved_pushes() call below
  sdata->sdata_op_ordering_lock.Lock();

  auto q = sdata->pg_slots.find(item.first);
  assert(q != sdata->pg_slots.end());
  auto& slot = q->second;
  --slot.num_running;

  if (slot.to_process.empty()) {
    // raced with wake_pg_waiters or prune_pg_waiters
    dout(20) << __func__ << " " << item.first << " nothing queued" << dendl;
    if (pg) {
      pg->unlock();
    }
    sdata->sdata_op_ordering_lock.Unlock();
    return;
  }
  if (requeue_seq != slot.requeue_seq) {
    dout(20) << __func__ << " " << item.first
             << " requeue_seq " << slot.requeue_seq << " > our "
             << requeue_seq << ", we raced with wake_pg_waiters"
             << dendl;
    if (pg) {
      pg->unlock();
    }
    sdata->sdata_op_ordering_lock.Unlock();
    return;
  }
  if (pg && !slot.pg && !pg->deleting) {
    dout(20) << __func__ << " " << item.first << " set pg to " << pg << dendl;
    slot.pg = pg;
  }
  dout(30) << __func__ << " " << item.first << " to_process " << slot.to_process
           << " waiting_for_pg=" << (int)slot.waiting_for_pg << dendl;

  // make sure we're not already waiting for this pg
  if (slot.waiting_for_pg) {
    dout(20) << __func__ << " " << item.first << " item " << item.second
             << " slot is waiting_for_pg" << dendl;
    if (pg) {
      pg->unlock();
    }
    sdata->sdata_op_ordering_lock.Unlock();
    return;
  }

  // take next item
  qi = slot.to_process.front();
  slot.to_process.pop_front();
  dout(20) << __func__ << " " << item.first << " item " << *qi
           << " pg " << pg << dendl;

  if (!pg) {
    // should this pg shard exist on this osd in this (or a later) epoch?
    OSDMapRef osdmap = sdata->waiting_for_pg_osdmap;
    if (osdmap->is_up_acting_osd_shard(item.first, osd->whoami)) {
      dout(20) << __func__ << " " << item.first
               << " no pg, should exist, will wait" << " on " << *qi << dendl;
      slot.to_process.push_front(*qi);
      slot.waiting_for_pg = true;
    } else if (qi->get_map_epoch() > osdmap->get_epoch()) {
      dout(20) << __func__ << " " << item.first << " no pg, item epoch is "
               << qi->get_map_epoch() << " > " << osdmap->get_epoch()
               << ", will wait on " << *qi << dendl;
      slot.to_process.push_front(*qi);
      slot.waiting_for_pg = true;
    } else {
      dout(20) << __func__ << " " << item.first << " no pg, shouldn't exist,"
               << " dropping " << *qi << dendl;
      // share map with client?
      if (boost::optional<OpRequestRef> _op = qi->maybe_get_op()) {
        Session *session = static_cast<Session *>(
          (*_op)->get_req()->get_connection()->get_priv());
        if (session) {
          osd->maybe_share_map(session, *_op, sdata->waiting_for_pg_osdmap);
          session->put();
        }
      }
      unsigned pushes_to_free = qi->get_reserved_pushes();
      if (pushes_to_free > 0) {
        sdata->sdata_op_ordering_lock.Unlock();
        osd->service.release_reserved_pushes(pushes_to_free);
        return;
      }
    }
    sdata->sdata_op_ordering_lock.Unlock();
    return;
  }
  sdata->sdata_op_ordering_lock.Unlock();


  // osd_opwq_process marks the point at which an operation has been dequeued
  // and will begin to be handled by a worker thread.
  {
#ifdef WITH_LTTNG
    osd_reqid_t reqid;
    if (boost::optional<OpRequestRef> _op = qi->maybe_get_op()) {
      reqid = (*_op)->get_reqid();
    }
#endif
    tracepoint(osd, opwq_process_start, reqid.name._type,
        reqid.name._num, reqid.tid, reqid.inc);
  }

  lgeneric_subdout(osd->cct, osd, 30) << "dequeue status: ";
  Formatter *f = Formatter::create("json");
  f->open_object_section("q");
  dump(f);
  f->close_section();
  f->flush(*_dout);
  delete f;
  *_dout << dendl;

  ThreadPool::TPHandle tp_handle(osd->cct, hb, timeout_interval,
                                 suicide_interval);
  qi->run(osd, pg, tp_handle);

  {
#ifdef WITH_LTTNG
    osd_reqid_t reqid;
    if (boost::optional<OpRequestRef> _op = qi->maybe_get_op()) {
      reqid = (*_op)->get_reqid();
    }
#endif
    tracepoint(osd, opwq_process_finish, reqid.name._type,
        reqid.name._num, reqid.tid, reqid.inc);
  }

  pg->unlock();
}

void OSD::ShardedOpWQ::_enqueue(pair<spg_t, PGQueueable> item) {
  uint32_t shard_index =
    item.first.hash_to_shard(shard_list.size());

  ShardData* sdata = shard_list[shard_index];
  assert (NULL != sdata);
  unsigned priority = item.second.get_priority();
  unsigned cost = item.second.get_cost();
  sdata->sdata_op_ordering_lock.Lock();

  dout(20) << __func__ << " " << item.first << " " << item.second << dendl;
  if (priority >= osd->op_prio_cutoff)
    sdata->pqueue->enqueue_strict(
      item.second.get_owner(), priority, item);
  else
    sdata->pqueue->enqueue(
      item.second.get_owner(),
      priority, cost, item);
  sdata->sdata_op_ordering_lock.Unlock();

  sdata->sdata_lock.Lock();
  sdata->sdata_cond.SignalOne();
  sdata->sdata_lock.Unlock();

}

void OSD::ShardedOpWQ::_enqueue_front(pair<spg_t, PGQueueable> item)
{
  uint32_t shard_index = item.first.hash_to_shard(shard_list.size());
  ShardData* sdata = shard_list[shard_index];
  assert (NULL != sdata);
  sdata->sdata_op_ordering_lock.Lock();
  auto p = sdata->pg_slots.find(item.first);
  if (p != sdata->pg_slots.end() && !p->second.to_process.empty()) {
    // we may be racing with _process, which has dequeued a new item
    // from pqueue, put it on to_process, and is now busy taking the
    // pg lock.  ensure this old requeued item is ordered before any
    // such newer item in to_process.
    p->second.to_process.push_front(item.second);
    item.second = p->second.to_process.back();
    p->second.to_process.pop_back();
    dout(20) << __func__ << " " << item.first
             << " " << p->second.to_process.front()
             << " shuffled w/ " << item.second << dendl;
  } else {
    dout(20) << __func__ << " " << item.first << " " << item.second << dendl;
  }
  sdata->_enqueue_front(item, osd->op_prio_cutoff);
  sdata->sdata_op_ordering_lock.Unlock();
  sdata->sdata_lock.Lock();
  sdata->sdata_cond.SignalOne();
  sdata->sdata_lock.Unlock();
}

namespace ceph { 
namespace osd_cmds { 

int heap(CephContext& cct, cmdmap_t& cmdmap, Formatter& f, std::ostream& os)
{
  if (!ceph_using_tcmalloc()) {
        os << "could not issue heap profiler command -- not using tcmalloc!";
        return -EOPNOTSUPP;
  }
  
  string cmd;
  if (!cmd_getval(&cct, cmdmap, "heapcmd", cmd)) {
        os << "unable to get value for command \"" << cmd << "\"";
       return -EINVAL;
   }
  
  std::vector<std::string> cmd_vec;
  get_str_vec(cmd, cmd_vec);
  
  ceph_heap_profiler_handle_command(cmd_vec, os);
  
  return 0;
}
 
}} // namespace ceph::osd_cmds


std::ostream& operator<<(std::ostream& out, const OSD::io_queue& q) {
  switch(q) {
  case OSD::io_queue::prioritized:
    out << "prioritized";
    break;
  case OSD::io_queue::weightedpriority:
    out << "weightedpriority";
    break;
  case OSD::io_queue::mclock_opclass:
    out << "mclock_opclass";
    break;
  case OSD::io_queue::mclock_client:
    out << "mclock_client";
    break;
  }
  return out;
}