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 MDSContext::complete(int r) {
  25   MDSRank *mds = get_mds();
  26   ceph_assert(mds != nullptr);
  27   ceph_assert(ceph_mutex_is_locked_by_me(mds->mds_lock));
  28   dout(10) << "MDSContext::complete: " << typeid(*this).name() << dendl;
  29   mds->heartbeat_reset();
  30   return Context::complete(r);
  31 }
  32
  33 void MDSInternalContextWrapper::finish(int r)
  34 {
  35   fin->complete(r);
  36 }
  37
  38 struct MDSIOContextList {
  39   elist<MDSIOContextBase*> list;
  40   ceph::spinlock lock;
  41   MDSIOContextList() : list(member_offset(MDSIOContextBase, list_item)) {}
  42   ~MDSIOContextList() {
  43     list.clear(); // avoid assertion in elist's destructor
  44   }
  45 } ioctx_list;
  46
  47 MDSIOContextBase::MDSIOContextBase(bool track)
  48 {
  49   created_at = ceph::coarse_mono_clock::now();
  50   if (track) {
  51     ioctx_list.lock.lock();
  52     ioctx_list.list.push_back(&list_item);
  53     ioctx_list.lock.unlock();
  54   }
  55 }
  56
  57 MDSIOContextBase::~MDSIOContextBase()
  58 {
  59   ioctx_list.lock.lock();
  60   list_item.remove_myself();
  61   ioctx_list.lock.unlock();
  62 }
  63
  64 bool MDSIOContextBase::check_ios_in_flight(ceph::coarse_mono_time cutoff,
  65                                            std::string& slow_count,
  66                                            ceph::coarse_mono_time& oldest)
  67 {
  68   static const unsigned MAX_COUNT = 100;
  69   unsigned slow = 0;
  70
  71   ioctx_list.lock.lock();
  72   for (elist<MDSIOContextBase*>::iterator p = ioctx_list.list.begin(); !p.end(); ++p) {
  73     MDSIOContextBase *c = *p;
  74     if (c->created_at >= cutoff)
  75       break;
  76     ++slow;
  77     if (slow > MAX_COUNT)
  78       break;
  79     if (slow == 1)
  80       oldest = c->created_at;
  81   }
  82   ioctx_list.lock.unlock();
  83
  84   if (slow > 0) {
  85     if (slow > MAX_COUNT)
  86       slow_count = std::to_string(MAX_COUNT) + "+";
  87     else
  88       slow_count = std::to_string(slow);
  89     return true;
  90   } else {
  91     return false;
  92   }
  93 }
  94
  95 void MDSIOContextBase::complete(int r) {
  96   MDSRank *mds = get_mds();
  97
  98   dout(10) << "MDSIOContextBase::complete: " << typeid(*this).name() << dendl;
  99   ceph_assert(mds != NULL);
 100   // Note, MDSIOContext is passed outside the MDS and, strangely, we grab the
 101   // lock here when MDSContext::complete would otherwise assume the lock is
 102   // already acquired.
 103   std::lock_guard l(mds->mds_lock);
 104
 105   if (mds->is_daemon_stopping()) {
 106     dout(4) << "MDSIOContextBase::complete: dropping for stopping "
 107             << typeid(*this).name() << dendl;
 108     return;
 109   }
 110
 111   // It's possible that the osd op requests will be stuck and then times out
 112   // after "rados_osd_op_timeout", the mds won't know what we should it, just
 113   // respawn it.
 114   if (r == -CEPHFS_EBLOCKLISTED || r == -CEPHFS_ETIMEDOUT) {
 115     derr << "MDSIOContextBase: failed with " << r << ", restarting..." << dendl;
 116     mds->respawn();
 117   } else {
 118     MDSContext::complete(r);
 119   }
 120 }
 121
 122 void MDSLogContextBase::complete(int r) {
 123   MDLog *mdlog = get_mds()->mdlog;
 124   uint64_t safe_pos = write_pos;
 125   pre_finish(r);
 126   // MDSIOContext::complete() free this
 127   MDSIOContextBase::complete(r);
 128   // safe_pos must be updated after MDSIOContext::complete() call
 129   mdlog->set_safe_pos(safe_pos);
 130 }
 131
 132 void MDSIOContextWrapper::finish(int r)
 133 {
 134   fin->complete(r);
 135 }
 136
 137 void C_IO_Wrapper::complete(int r)
 138 {
 139   if (async) {
 140     async = false;
 141     get_mds()->finisher->queue(this, r);
 142   } else {
 143     MDSIOContext::complete(r);
 144   }
 145 }