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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/journal/ObjectDispatch.h"
#include "common/dout.h"
#include "common/WorkQueue.h"
#include "osdc/Striper.h"
#include "librbd/ImageCtx.h"
#include "librbd/Journal.h"
#include "librbd/io/ObjectDispatchSpec.h"
#include "librbd/io/ObjectDispatcher.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::journal::ObjectDispatch: " << this \
<< " " << __func__ << ": "
namespace librbd {
namespace journal {
namespace {
template <typename I>
struct C_CommitIOEvent : public Context {
I* image_ctx;
Journal<I>* journal;
uint64_t object_no;
uint64_t object_off;
uint64_t object_len;
uint64_t journal_tid;
int object_dispatch_flags;
Context* on_finish;
C_CommitIOEvent(I* image_ctx, Journal<I>* journal, uint64_t object_no,
uint64_t object_off, uint64_t object_len,
uint64_t journal_tid, int object_dispatch_flags,
Context* on_finish)
: image_ctx(image_ctx), journal(journal), object_no(object_no),
object_off(object_off), object_len(object_len), journal_tid(journal_tid),
object_dispatch_flags(object_dispatch_flags), on_finish(on_finish) {
}
void finish(int r) override {
// don't commit the IO extent if a previous dispatch handler will just
// retry the failed IO
if (r >= 0 ||
(object_dispatch_flags &
io::OBJECT_DISPATCH_FLAG_WILL_RETRY_ON_ERROR) == 0) {
io::Extents file_extents;
Striper::extent_to_file(image_ctx->cct, &image_ctx->layout, object_no,
object_off, object_len, file_extents);
for (auto& extent : file_extents) {
journal->commit_io_event_extent(journal_tid, extent.first,
extent.second, r);
}
}
if (on_finish != nullptr) {
on_finish->complete(r);
}
}
};
} // anonymous namespace
template <typename I>
ObjectDispatch<I>::ObjectDispatch(I* image_ctx, Journal<I>* journal)
: m_image_ctx(image_ctx), m_journal(journal) {
}
template <typename I>
void ObjectDispatch<I>::shut_down(Context* on_finish) {
m_image_ctx->op_work_queue->queue(on_finish, 0);
}
template <typename I>
bool ObjectDispatch<I>::discard(
const std::string &oid, uint64_t object_no, uint64_t object_off,
uint64_t object_len, const ::SnapContext &snapc, int discard_flags,
const ZTracer::Trace &parent_trace, int* object_dispatch_flags,
uint64_t* journal_tid, io::DispatchResult* dispatch_result,
Context** on_finish, Context* on_dispatched) {
if (*journal_tid == 0) {
// non-journaled IO
return false;
}
auto cct = m_image_ctx->cct;
ldout(cct, 20) << oid << " " << object_off << "~" << object_len << dendl;
*on_finish = new C_CommitIOEvent<I>(m_image_ctx, m_journal, object_no,
object_off, object_len, *journal_tid,
*object_dispatch_flags, *on_finish);
*dispatch_result = io::DISPATCH_RESULT_CONTINUE;
wait_or_flush_event(*journal_tid, *object_dispatch_flags, on_dispatched);
return true;
}
template <typename I>
bool ObjectDispatch<I>::write(
const std::string &oid, uint64_t object_no, uint64_t object_off,
ceph::bufferlist&& data, const ::SnapContext &snapc, int op_flags,
const ZTracer::Trace &parent_trace, int* object_dispatch_flags,
uint64_t* journal_tid, io::DispatchResult* dispatch_result,
Context** on_finish, Context* on_dispatched) {
if (*journal_tid == 0) {
// non-journaled IO
return false;
}
auto cct = m_image_ctx->cct;
ldout(cct, 20) << oid << " " << object_off << "~" << data.length() << dendl;
*on_finish = new C_CommitIOEvent<I>(m_image_ctx, m_journal, object_no,
object_off, data.length(), *journal_tid,
*object_dispatch_flags, *on_finish);
*dispatch_result = io::DISPATCH_RESULT_CONTINUE;
wait_or_flush_event(*journal_tid, *object_dispatch_flags, on_dispatched);
return true;
}
template <typename I>
bool ObjectDispatch<I>::write_same(
const std::string &oid, uint64_t object_no, uint64_t object_off,
uint64_t object_len, io::Extents&& buffer_extents, ceph::bufferlist&& data,
const ::SnapContext &snapc, int op_flags,
const ZTracer::Trace &parent_trace, int* object_dispatch_flags,
uint64_t* journal_tid, io::DispatchResult* dispatch_result,
Context** on_finish, Context* on_dispatched) {
if (*journal_tid == 0) {
// non-journaled IO
return false;
}
auto cct = m_image_ctx->cct;
ldout(cct, 20) << oid << " " << object_off << "~" << object_len << dendl;
*on_finish = new C_CommitIOEvent<I>(m_image_ctx, m_journal, object_no,
object_off, object_len, *journal_tid,
*object_dispatch_flags, *on_finish);
*dispatch_result = io::DISPATCH_RESULT_CONTINUE;
wait_or_flush_event(*journal_tid, *object_dispatch_flags, on_dispatched);
return true;
}
template <typename I>
bool ObjectDispatch<I>::compare_and_write(
const std::string &oid, uint64_t object_no, uint64_t object_off,
ceph::bufferlist&& cmp_data, ceph::bufferlist&& write_data,
const ::SnapContext &snapc, int op_flags,
const ZTracer::Trace &parent_trace, uint64_t* mismatch_offset,
int* object_dispatch_flags, uint64_t* journal_tid,
io::DispatchResult* dispatch_result, Context** on_finish,
Context* on_dispatched) {
if (*journal_tid == 0) {
// non-journaled IO
return false;
}
auto cct = m_image_ctx->cct;
ldout(cct, 20) << oid << " " << object_off << "~" << write_data.length()
<< dendl;
*on_finish = new C_CommitIOEvent<I>(m_image_ctx, m_journal, object_no,
object_off, write_data.length(),
*journal_tid, *object_dispatch_flags,
*on_finish);
*dispatch_result = io::DISPATCH_RESULT_CONTINUE;
wait_or_flush_event(*journal_tid, *object_dispatch_flags, on_dispatched);
return true;
}
template <typename I>
void ObjectDispatch<I>::extent_overwritten(
uint64_t object_no, uint64_t object_off, uint64_t object_len,
uint64_t journal_tid, uint64_t new_journal_tid) {
auto cct = m_image_ctx->cct;
ldout(cct, 20) << object_no << " " << object_off << "~" << object_len
<< dendl;
auto ctx = new C_CommitIOEvent<I>(m_image_ctx, m_journal, object_no,
object_off, object_len, journal_tid, false,
nullptr);
if (new_journal_tid != 0) {
// ensure new journal event is safely committed to disk before
// committing old event
m_journal->flush_event(new_journal_tid, ctx);
} else {
ctx->complete(0);
}
}
template <typename I>
void ObjectDispatch<I>::wait_or_flush_event(
uint64_t journal_tid, int object_dispatch_flags, Context* on_dispatched) {
auto cct = m_image_ctx->cct;
ldout(cct, 20) << "journal_tid=" << journal_tid << dendl;
if ((object_dispatch_flags & io::OBJECT_DISPATCH_FLAG_FLUSH) != 0) {
m_journal->flush_event(journal_tid, on_dispatched);
} else {
m_journal->wait_event(journal_tid, on_dispatched);
}
}
} // namespace journal
} // namespace librbd
template class librbd::journal::ObjectDispatch<librbd::ImageCtx>;
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