ceph/src/mds/MDSContext.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2012 Red Hat
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15
  16 #include "MDSRank.h"
  17
  18 #include "MDSContext.h"
  19
  20 #include "common/dout.h"
  21 #define dout_context g_ceph_context
  22 #define dout_subsys ceph_subsys_mds
  23
  24 void MDSInternalContextBase::complete(int r) {
  25   MDSRank *mds = get_mds();
  26
  27   dout(10) << "MDSInternalContextBase::complete: " << typeid(*this).name() << dendl;
  28   assert(mds != NULL);
  29   assert(mds->mds_lock.is_locked_by_me());
  30   MDSContext::complete(r);
  31 }
  32
  33
  34 MDSRank *MDSInternalContext::get_mds() {
  35   return mds;
  36 }
  37
  38 MDSRank *MDSInternalContextWrapper::get_mds()
  39 {
  40   return mds;
  41 }
  42
  43 void MDSInternalContextWrapper::finish(int r)
  44 {
  45   fin->complete(r);
  46 }
  47
  48 elist<MDSIOContextBase*> MDSIOContextBase::ctx_list(member_offset(MDSIOContextBase, list_item));
  49 std::atomic_flag MDSIOContextBase::ctx_list_lock = ATOMIC_FLAG_INIT;
  50
  51 MDSIOContextBase::MDSIOContextBase(bool track)
  52 {
  53   created_at = ceph::coarse_mono_clock::now();
  54   if (track) {
  55     simple_spin_lock(&ctx_list_lock);
  56     ctx_list.push_back(&list_item);
  57     simple_spin_unlock(&ctx_list_lock);
  58   }
  59 }
  60
  61 MDSIOContextBase::~MDSIOContextBase()
  62 {
  63   simple_spin_lock(&ctx_list_lock);
  64   list_item.remove_myself();
  65   simple_spin_unlock(&ctx_list_lock);
  66 }
  67
  68 bool MDSIOContextBase::check_ios_in_flight(ceph::coarse_mono_time cutoff,
  69                                            std::string& slow_count,
  70                                            ceph::coarse_mono_time& oldest)
  71 {
  72   static const unsigned MAX_COUNT = 100;
  73   unsigned slow = 0;
  74
  75   simple_spin_lock(&ctx_list_lock);
  76   for (elist<MDSIOContextBase*>::iterator p = ctx_list.begin(); !p.end(); ++p) {
  77     MDSIOContextBase *c = *p;
  78     if (c->created_at >= cutoff)
  79       break;
  80     ++slow;
  81     if (slow > MAX_COUNT)
  82       break;
  83     if (slow == 1)
  84       oldest = c->created_at;
  85   }
  86   simple_spin_unlock(&ctx_list_lock);
  87
  88   if (slow > 0) {
  89     if (slow > MAX_COUNT)
  90       slow_count = std::to_string(MAX_COUNT) + "+";
  91     else
  92       slow_count = std::to_string(slow);
  93     return true;
  94   } else {
  95     return false;
  96   }
  97 }
  98
  99 void MDSIOContextBase::complete(int r) {
 100   MDSRank *mds = get_mds();
 101
 102   dout(10) << "MDSIOContextBase::complete: " << typeid(*this).name() << dendl;
 103   assert(mds != NULL);
 104   Mutex::Locker l(mds->mds_lock);
 105
 106   if (mds->is_daemon_stopping()) {
 107     dout(4) << "MDSIOContextBase::complete: dropping for stopping "
 108             << typeid(*this).name() << dendl;
 109     return;
 110   }
 111
 112   if (r == -EBLACKLISTED) {
 113     derr << "MDSIOContextBase: blacklisted!  Restarting..." << dendl;
 114     mds->respawn();
 115   } else {
 116     MDSContext::complete(r);
 117   }
 118 }
 119
 120 void MDSLogContextBase::complete(int r) {
 121   MDLog *mdlog = get_mds()->mdlog;
 122   uint64_t safe_pos = write_pos;
 123   pre_finish(r);
 124   // MDSContextBase::complete() free this
 125   MDSIOContextBase::complete(r);
 126   mdlog->set_safe_pos(safe_pos);
 127 }
 128
 129 MDSRank *MDSIOContext::get_mds() {
 130   return mds;
 131 }
 132
 133 MDSRank *MDSIOContextWrapper::get_mds() {
 134   return mds;
 135 }
 136
 137 void MDSIOContextWrapper::finish(int r)
 138 {
 139   fin->complete(r);
 140 }
 141
 142 void C_IO_Wrapper::complete(int r)
 143 {
 144   if (async) {
 145     async = false;
 146     get_mds()->finisher->queue(this, r);
 147   } else {
 148     MDSIOContext::complete(r);
 149   }
 150 }
 151
 152 MDSRank *MDSInternalContextGather::get_mds()
 153 {
 154   derr << "Forbidden call to MDSInternalContextGather::get_mds by " << typeid(*this).name() << dendl;
 155   ceph_abort();
 156 }
 157