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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2012 Red Hat
*
* 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 "MDSRank.h"
#include "MDSContext.h"
#include "common/dout.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_mds
void MDSContext::complete(int r) {
MDSRank *mds = get_mds();
ceph_assert(mds != nullptr);
ceph_assert(ceph_mutex_is_locked_by_me(mds->mds_lock));
dout(10) << "MDSContext::complete: " << typeid(*this).name() << dendl;
mds->heartbeat_reset();
return Context::complete(r);
}
void MDSInternalContextWrapper::finish(int r)
{
fin->complete(r);
}
struct MDSIOContextList {
elist<MDSIOContextBase*> list;
ceph::spinlock lock;
MDSIOContextList() : list(member_offset(MDSIOContextBase, list_item)) {}
~MDSIOContextList() {
list.clear(); // avoid assertion in elist's destructor
}
} ioctx_list;
MDSIOContextBase::MDSIOContextBase(bool track)
{
created_at = ceph::coarse_mono_clock::now();
if (track) {
ioctx_list.lock.lock();
ioctx_list.list.push_back(&list_item);
ioctx_list.lock.unlock();
}
}
MDSIOContextBase::~MDSIOContextBase()
{
ioctx_list.lock.lock();
list_item.remove_myself();
ioctx_list.lock.unlock();
}
bool MDSIOContextBase::check_ios_in_flight(ceph::coarse_mono_time cutoff,
std::string& slow_count,
ceph::coarse_mono_time& oldest)
{
static const unsigned MAX_COUNT = 100;
unsigned slow = 0;
ioctx_list.lock.lock();
for (elist<MDSIOContextBase*>::iterator p = ioctx_list.list.begin(); !p.end(); ++p) {
MDSIOContextBase *c = *p;
if (c->created_at >= cutoff)
break;
++slow;
if (slow > MAX_COUNT)
break;
if (slow == 1)
oldest = c->created_at;
}
ioctx_list.lock.unlock();
if (slow > 0) {
if (slow > MAX_COUNT)
slow_count = std::to_string(MAX_COUNT) + "+";
else
slow_count = std::to_string(slow);
return true;
} else {
return false;
}
}
void MDSIOContextBase::complete(int r) {
MDSRank *mds = get_mds();
dout(10) << "MDSIOContextBase::complete: " << typeid(*this).name() << dendl;
ceph_assert(mds != NULL);
// Note, MDSIOContext is passed outside the MDS and, strangely, we grab the
// lock here when MDSContext::complete would otherwise assume the lock is
// already acquired.
std::lock_guard l(mds->mds_lock);
if (mds->is_daemon_stopping()) {
dout(4) << "MDSIOContextBase::complete: dropping for stopping "
<< typeid(*this).name() << dendl;
return;
}
// It's possible that the osd op requests will be stuck and then times out
// after "rados_osd_op_timeout", the mds won't know what we should it, just
// respawn it.
if (r == -CEPHFS_EBLOCKLISTED || r == -CEPHFS_ETIMEDOUT) {
derr << "MDSIOContextBase: failed with " << r << ", restarting..." << dendl;
mds->respawn();
} else {
MDSContext::complete(r);
}
}
void MDSLogContextBase::complete(int r) {
MDLog *mdlog = get_mds()->mdlog;
uint64_t safe_pos = write_pos;
pre_finish(r);
// MDSIOContext::complete() free this
MDSIOContextBase::complete(r);
// safe_pos must be updated after MDSIOContext::complete() call
mdlog->set_safe_pos(safe_pos);
}
void MDSIOContextWrapper::finish(int r)
{
fin->complete(r);
}
void C_IO_Wrapper::complete(int r)
{
if (async) {
async = false;
get_mds()->finisher->queue(this, r);
} else {
MDSIOContext::complete(r);
}
}
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