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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "SyncPoint.h"
#define dout_subsys ceph_subsys_rbd_pwl
#undef dout_prefix
#define dout_prefix *_dout << "librbd::cache::pwl::SyncPoint: " << this << " " \
<< __func__ << ": "
namespace librbd {
namespace cache {
namespace pwl {
SyncPoint::SyncPoint(uint64_t sync_gen_num, CephContext *cct)
: log_entry(std::make_shared<SyncPointLogEntry>(sync_gen_num)), m_cct(cct) {
m_prior_log_entries_persisted = new C_Gather(cct, nullptr);
m_sync_point_persist = new C_Gather(cct, nullptr);
on_sync_point_appending.reserve(MAX_WRITES_PER_SYNC_POINT + 2);
on_sync_point_persisted.reserve(MAX_WRITES_PER_SYNC_POINT + 2);
ldout(m_cct, 20) << "sync point " << sync_gen_num << dendl;
}
SyncPoint::~SyncPoint() {
ceph_assert(on_sync_point_appending.empty());
ceph_assert(on_sync_point_persisted.empty());
ceph_assert(!earlier_sync_point);
}
std::ostream &operator<<(std::ostream &os,
const SyncPoint &p) {
os << "log_entry=[" << *p.log_entry
<< "], earlier_sync_point=" << p.earlier_sync_point
<< ", later_sync_point=" << p.later_sync_point
<< ", m_final_op_sequence_num=" << p.m_final_op_sequence_num
<< ", m_prior_log_entries_persisted=" << p.m_prior_log_entries_persisted
<< ", m_prior_log_entries_persisted_complete=" << p.m_prior_log_entries_persisted_complete
<< ", m_append_scheduled=" << p.m_append_scheduled
<< ", appending=" << p.appending
<< ", on_sync_point_appending=" << p.on_sync_point_appending.size()
<< ", on_sync_point_persisted=" << p.on_sync_point_persisted.size();
return os;
}
void SyncPoint::persist_gather_set_finisher(Context *ctx) {
m_append_scheduled = true;
/* All prior sync points that are still in this list must already be scheduled for append */
std::shared_ptr<SyncPoint> previous = earlier_sync_point;
while (previous) {
ceph_assert(previous->m_append_scheduled);
previous = previous->earlier_sync_point;
}
m_sync_point_persist->set_finisher(ctx);
}
void SyncPoint::persist_gather_activate() {
m_sync_point_persist->activate();
}
Context* SyncPoint::persist_gather_new_sub() {
return m_sync_point_persist->new_sub();
}
void SyncPoint::prior_persisted_gather_activate() {
m_prior_log_entries_persisted->activate();
}
Context* SyncPoint::prior_persisted_gather_new_sub() {
return m_prior_log_entries_persisted->new_sub();
}
void SyncPoint::prior_persisted_gather_set_finisher() {
Context *sync_point_persist_ready = persist_gather_new_sub();
std::shared_ptr<SyncPoint> sp = shared_from_this();
m_prior_log_entries_persisted->
set_finisher(new LambdaContext([this, sp, sync_point_persist_ready](int r) {
ldout(m_cct, 20) << "Prior log entries persisted for sync point =["
<< sp << "]" << dendl;
sp->m_prior_log_entries_persisted_result = r;
sp->m_prior_log_entries_persisted_complete = true;
sync_point_persist_ready->complete(r);
}));
}
void SyncPoint::add_in_on_persisted_ctxs(Context* ctx) {
on_sync_point_persisted.push_back(ctx);
}
void SyncPoint::add_in_on_appending_ctxs(Context* ctx) {
on_sync_point_appending.push_back(ctx);
}
void SyncPoint::setup_earlier_sync_point(std::shared_ptr<SyncPoint> sync_point,
uint64_t last_op_sequence_num) {
earlier_sync_point = sync_point;
log_entry->prior_sync_point_flushed = false;
earlier_sync_point->log_entry->next_sync_point_entry = log_entry;
earlier_sync_point->later_sync_point = shared_from_this();
earlier_sync_point->m_final_op_sequence_num = last_op_sequence_num;
if (!earlier_sync_point->appending) {
/* Append of new sync point deferred until old sync point is appending */
earlier_sync_point->add_in_on_appending_ctxs(prior_persisted_gather_new_sub());
}
}
} // namespace pwl
} // namespace cache
} // namespace librbd
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