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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
*
* Copyright (C) 2012 CohortFS, LLC.
*
* 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.
*
*/
#if defined(__FreeBSD__)
#include <sys/param.h>
#endif
#include "include/Context.h"
#include "Client.h"
#include "barrier.h"
#include "include/ceph_assert.h"
#undef dout_prefix
#define dout_prefix *_dout << "client." << whoami << " "
#define dout_subsys ceph_subsys_client
#define cldout(cl, v) dout_impl((cl)->cct, dout_subsys, v) \
*_dout << "client." << cl->whoami << " "
/* C_Block_Sync */
class C_Block_Sync : public Context {
private:
Client *cl;
uint64_t ino;
barrier_interval iv;
enum CBlockSync_State state;
Barrier *barrier;
int *rval; /* see Cond.h */
public:
boost::intrusive::list_member_hook<> intervals_hook;
C_Block_Sync(Client *c, uint64_t i, barrier_interval iv, int *r);
void finish(int rval);
friend class Barrier;
friend class BarrierContext;
};
C_Block_Sync::C_Block_Sync(Client *c, uint64_t i, barrier_interval iv,
int *r=0) :
cl(c), ino(i), iv(iv), rval(r)
{
state = CBlockSync_State_None;
barrier = NULL;
cldout(cl, 1) << "C_Block_Sync for " << ino << dendl;
if (!cl->barriers[ino]) {
cl->barriers[ino] = new BarrierContext(cl, ino);
}
/* XXX current semantics aren't commit-ordered */
cl->barriers[ino]->write_nobarrier(*this);
}
void C_Block_Sync::finish(int r) {
cldout(cl, 1) << "C_Block_Sync::finish() for " << ino << " "
<< iv << " r==" << r << dendl;
if (rval)
*rval = r;
cl->barriers[ino]->complete(*this);
}
/* Barrier */
Barrier::Barrier()
{ }
Barrier::~Barrier()
{ }
/* BarrierContext */
BarrierContext::BarrierContext(Client *c, uint64_t ino) :
cl(c), ino(ino)
{ };
void BarrierContext::write_nobarrier(C_Block_Sync &cbs)
{
std::lock_guard locker(lock);
cbs.state = CBlockSync_State_Unclaimed;
outstanding_writes.push_back(cbs);
}
void BarrierContext::write_barrier(C_Block_Sync &cbs)
{
std::unique_lock locker(lock);
barrier_interval &iv = cbs.iv;
{ /* find blocking commit--intrusive no help here */
BarrierList::iterator iter;
bool done = false;
for (iter = active_commits.begin();
!done && (iter != active_commits.end());
++iter) {
Barrier &barrier = *iter;
while (boost::icl::intersects(barrier.span, iv)) {
/* wait on this */
barrier.cond.wait(locker);
done = true;
}
}
}
cbs.state = CBlockSync_State_Unclaimed;
outstanding_writes.push_back(cbs);
} /* write_barrier */
void BarrierContext::commit_barrier(barrier_interval &civ)
{
std::unique_lock locker(lock);
/* we commit outstanding writes--if none exist, we don't care */
if (outstanding_writes.size() == 0)
return;
boost::icl::interval_set<uint64_t> cvs;
cvs.insert(civ);
Barrier *barrier = NULL;
BlockSyncList::iterator iter, iter2;
iter = outstanding_writes.begin();
while (iter != outstanding_writes.end()) {
barrier_interval &iv = iter->iv;
if (boost::icl::intersects(cvs, iv)) {
C_Block_Sync &a_write = *iter;
if (! barrier)
barrier = new Barrier();
/* mark the callback */
a_write.state = CBlockSync_State_Committing;
a_write.barrier = barrier;
iter2 = iter++;
outstanding_writes.erase(iter2);
barrier->write_list.push_back(a_write);
barrier->span.insert(iv);
/* avoid iter invalidate */
} else {
++iter;
}
}
if (barrier) {
active_commits.push_back(*barrier);
/* and wait on this */
barrier->cond.wait(locker);
}
} /* commit_barrier */
void BarrierContext::complete(C_Block_Sync &cbs)
{
std::lock_guard locker(lock);
BlockSyncList::iterator iter =
BlockSyncList::s_iterator_to(cbs);
switch (cbs.state) {
case CBlockSync_State_Unclaimed:
/* cool, no waiting */
outstanding_writes.erase(iter);
break;
case CBlockSync_State_Committing:
{
Barrier *barrier = iter->barrier;
barrier->write_list.erase(iter);
/* signal waiters */
barrier->cond.notify_all();
/* dispose cleared barrier */
if (barrier->write_list.size() == 0) {
BarrierList::iterator iter2 =
BarrierList::s_iterator_to(*barrier);
active_commits.erase(iter2);
delete barrier;
}
}
break;
default:
ceph_abort();
break;
}
cbs.state = CBlockSync_State_Completed;
} /* complete */
BarrierContext::~BarrierContext()
{ }
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