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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "librbd/operation/Request.h"
#include "common/dout.h"
#include "common/errno.h"
#include "common/WorkQueue.h"
#include "librbd/ImageCtx.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::Request: "
namespace librbd {
namespace operation {
template <typename I>
Request<I>::Request(I &image_ctx, Context *on_finish, uint64_t journal_op_tid)
: AsyncRequest<I>(image_ctx, on_finish), m_op_tid(journal_op_tid) {
}
template <typename I>
void Request<I>::send() {
I &image_ctx = this->m_image_ctx;
ceph_assert(image_ctx.owner_lock.is_locked());
// automatically create the event if we don't need to worry
// about affecting concurrent IO ops
if (can_affect_io() || !append_op_event()) {
send_op();
}
}
template <typename I>
Context *Request<I>::create_context_finisher(int r) {
// automatically commit the event if required (delete after commit)
if (m_appended_op_event && !m_committed_op_event &&
commit_op_event(r)) {
return nullptr;
}
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << dendl;
return util::create_context_callback<Request<I>, &Request<I>::finish>(this);
}
template <typename I>
void Request<I>::finish_and_destroy(int r) {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
// automatically commit the event if required (delete after commit)
if (m_appended_op_event && !m_committed_op_event &&
commit_op_event(r)) {
return;
}
AsyncRequest<I>::finish_and_destroy(r);
}
template <typename I>
void Request<I>::finish(int r) {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
ceph_assert(!m_appended_op_event || m_committed_op_event);
AsyncRequest<I>::finish(r);
}
template <typename I>
bool Request<I>::append_op_event() {
I &image_ctx = this->m_image_ctx;
ceph_assert(image_ctx.owner_lock.is_locked());
RWLock::RLocker snap_locker(image_ctx.snap_lock);
if (image_ctx.journal != nullptr &&
image_ctx.journal->is_journal_appending()) {
append_op_event(util::create_context_callback<
Request<I>, &Request<I>::handle_op_event_safe>(this));
return true;
}
return false;
}
template <typename I>
bool Request<I>::commit_op_event(int r) {
I &image_ctx = this->m_image_ctx;
RWLock::RLocker snap_locker(image_ctx.snap_lock);
if (!m_appended_op_event) {
return false;
}
ceph_assert(m_op_tid != 0);
ceph_assert(!m_committed_op_event);
m_committed_op_event = true;
if (image_ctx.journal != nullptr &&
image_ctx.journal->is_journal_appending()) {
CephContext *cct = image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
// ops will be canceled / completed before closing journal
ceph_assert(image_ctx.journal->is_journal_ready());
image_ctx.journal->commit_op_event(m_op_tid, r,
new C_CommitOpEvent(this, r));
return true;
}
return false;
}
template <typename I>
void Request<I>::handle_commit_op_event(int r, int original_ret_val) {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
if (r < 0) {
lderr(cct) << "failed to commit op event to journal: " << cpp_strerror(r)
<< dendl;
}
if (original_ret_val < 0) {
r = original_ret_val;
}
finish(r);
}
template <typename I>
void Request<I>::replay_op_ready(Context *on_safe) {
I &image_ctx = this->m_image_ctx;
ceph_assert(image_ctx.owner_lock.is_locked());
ceph_assert(image_ctx.snap_lock.is_locked());
ceph_assert(m_op_tid != 0);
m_appended_op_event = true;
image_ctx.journal->replay_op_ready(
m_op_tid, util::create_async_context_callback(image_ctx, on_safe));
}
template <typename I>
void Request<I>::append_op_event(Context *on_safe) {
I &image_ctx = this->m_image_ctx;
ceph_assert(image_ctx.owner_lock.is_locked());
ceph_assert(image_ctx.snap_lock.is_locked());
CephContext *cct = image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << dendl;
m_op_tid = image_ctx.journal->allocate_op_tid();
image_ctx.journal->append_op_event(
m_op_tid, journal::EventEntry{create_event(m_op_tid)},
new C_AppendOpEvent(this, on_safe));
}
template <typename I>
void Request<I>::handle_op_event_safe(int r) {
I &image_ctx = this->m_image_ctx;
CephContext *cct = image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
if (r < 0) {
lderr(cct) << "failed to commit op event to journal: " << cpp_strerror(r)
<< dendl;
this->finish(r);
delete this;
} else {
ceph_assert(!can_affect_io());
// haven't started the request state machine yet
RWLock::RLocker owner_locker(image_ctx.owner_lock);
send_op();
}
}
} // namespace operation
} // namespace librbd
#ifndef TEST_F
template class librbd::operation::Request<librbd::ImageCtx>;
#endif
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