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Journal.cc
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Journal.cc
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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.h"
#include "include/rados/librados.hpp"
#include "common/errno.h"
#include "common/Timer.h"
#include "common/WorkQueue.h"
#include "cls/journal/cls_journal_types.h"
#include "journal/Journaler.h"
#include "journal/Policy.h"
#include "journal/ReplayEntry.h"
#include "journal/Settings.h"
#include "journal/Utils.h"
#include "librbd/ExclusiveLock.h"
#include "librbd/ImageCtx.h"
#include "librbd/io/ImageRequestWQ.h"
#include "librbd/io/ObjectRequest.h"
#include "librbd/journal/CreateRequest.h"
#include "librbd/journal/DemoteRequest.h"
#include "librbd/journal/OpenRequest.h"
#include "librbd/journal/RemoveRequest.h"
#include "librbd/journal/Replay.h"
#include "librbd/journal/PromoteRequest.h"
#include <boost/scope_exit.hpp>
#include <utility>
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::Journal: "
namespace librbd {
using util::create_async_context_callback;
using util::create_context_callback;
using journal::util::C_DecodeTag;
using journal::util::C_DecodeTags;
namespace {
// TODO: once journaler is 100% async, remove separate threads and
// reuse ImageCtx's thread pool
class ThreadPoolSingleton : public ThreadPool {
public:
explicit ThreadPoolSingleton(CephContext *cct)
: ThreadPool(cct, "librbd::Journal", "tp_librbd_journ", 1) {
start();
}
~ThreadPoolSingleton() override {
stop();
}
};
template <typename I>
struct C_IsTagOwner : public Context {
librados::IoCtx &io_ctx;
std::string image_id;
bool *is_tag_owner;
ContextWQ *op_work_queue;
Context *on_finish;
CephContext *cct = nullptr;
Journaler *journaler;
cls::journal::Client client;
journal::ImageClientMeta client_meta;
uint64_t tag_tid = 0;
journal::TagData tag_data;
C_IsTagOwner(librados::IoCtx &io_ctx, const std::string &image_id,
bool *is_tag_owner, ContextWQ *op_work_queue, Context *on_finish)
: io_ctx(io_ctx), image_id(image_id), is_tag_owner(is_tag_owner),
op_work_queue(op_work_queue), on_finish(on_finish),
cct(reinterpret_cast<CephContext*>(io_ctx.cct())),
journaler(new Journaler(io_ctx, image_id, Journal<>::IMAGE_CLIENT_ID,
{})) {
}
void finish(int r) override {
ldout(cct, 20) << this << " C_IsTagOwner::" << __func__ << ": r=" << r
<< dendl;
if (r < 0) {
lderr(cct) << this << " C_IsTagOwner::" << __func__ << ": "
<< "failed to get tag owner: " << cpp_strerror(r) << dendl;
} else {
*is_tag_owner = (tag_data.mirror_uuid == Journal<>::LOCAL_MIRROR_UUID);
}
Journaler *journaler = this->journaler;
Context *on_finish = this->on_finish;
FunctionContext *ctx = new FunctionContext(
[journaler, on_finish](int r) {
on_finish->complete(r);
delete journaler;
});
op_work_queue->queue(ctx, r);
}
};
struct C_GetTagOwner : public Context {
std::string *mirror_uuid;
Context *on_finish;
Journaler journaler;
cls::journal::Client client;
journal::ImageClientMeta client_meta;
uint64_t tag_tid = 0;
journal::TagData tag_data;
C_GetTagOwner(librados::IoCtx &io_ctx, const std::string &image_id,
std::string *mirror_uuid, Context *on_finish)
: mirror_uuid(mirror_uuid), on_finish(on_finish),
journaler(io_ctx, image_id, Journal<>::IMAGE_CLIENT_ID, {}) {
}
virtual void finish(int r) {
if (r >= 0) {
*mirror_uuid = tag_data.mirror_uuid;
}
on_finish->complete(r);
}
};
template <typename J>
struct GetTagsRequest {
CephContext *cct;
J *journaler;
cls::journal::Client *client;
journal::ImageClientMeta *client_meta;
uint64_t *tag_tid;
journal::TagData *tag_data;
Context *on_finish;
Mutex lock;
GetTagsRequest(CephContext *cct, J *journaler, cls::journal::Client *client,
journal::ImageClientMeta *client_meta, uint64_t *tag_tid,
journal::TagData *tag_data, Context *on_finish)
: cct(cct), journaler(journaler), client(client), client_meta(client_meta),
tag_tid(tag_tid), tag_data(tag_data), on_finish(on_finish), lock("lock") {
}
/**
* @verbatim
*
* <start>
* |
* v
* GET_CLIENT * * * * * * * * * * * *
* | *
* v *
* GET_TAGS * * * * * * * * * * * * * (error)
* | *
* v *
* <finish> * * * * * * * * * * * * *
*
* @endverbatim
*/
void send() {
send_get_client();
}
void send_get_client() {
ldout(cct, 20) << __func__ << dendl;
FunctionContext *ctx = new FunctionContext(
[this](int r) {
handle_get_client(r);
});
journaler->get_client(Journal<ImageCtx>::IMAGE_CLIENT_ID, client, ctx);
}
void handle_get_client(int r) {
ldout(cct, 20) << __func__ << ": r=" << r << dendl;
if (r < 0) {
complete(r);
return;
}
librbd::journal::ClientData client_data;
bufferlist::iterator bl_it = client->data.begin();
try {
::decode(client_data, bl_it);
} catch (const buffer::error &err) {
lderr(cct) << this << " OpenJournalerRequest::" << __func__ << ": "
<< "failed to decode client data" << dendl;
complete(-EBADMSG);
return;
}
journal::ImageClientMeta *image_client_meta =
boost::get<journal::ImageClientMeta>(&client_data.client_meta);
if (image_client_meta == nullptr) {
lderr(cct) << this << " OpenJournalerRequest::" << __func__ << ": "
<< "failed to get client meta" << dendl;
complete(-EINVAL);
return;
}
*client_meta = *image_client_meta;
send_get_tags();
}
void send_get_tags() {
ldout(cct, 20) << __func__ << dendl;
FunctionContext *ctx = new FunctionContext(
[this](int r) {
handle_get_tags(r);
});
C_DecodeTags *tags_ctx = new C_DecodeTags(cct, &lock, tag_tid, tag_data,
ctx);
journaler->get_tags(client_meta->tag_class, &tags_ctx->tags, tags_ctx);
}
void handle_get_tags(int r) {
ldout(cct, 20) << __func__ << ": r=" << r << dendl;
complete(r);
}
void complete(int r) {
on_finish->complete(r);
delete this;
}
};
template <typename J>
void get_tags(CephContext *cct, J *journaler,
cls::journal::Client *client,
journal::ImageClientMeta *client_meta,
uint64_t *tag_tid, journal::TagData *tag_data,
Context *on_finish) {
ldout(cct, 20) << __func__ << dendl;
GetTagsRequest<J> *req =
new GetTagsRequest<J>(cct, journaler, client, client_meta, tag_tid,
tag_data, on_finish);
req->send();
}
template <typename J>
int allocate_journaler_tag(CephContext *cct, J *journaler,
uint64_t tag_class,
const journal::TagPredecessor &predecessor,
const std::string &mirror_uuid,
cls::journal::Tag *new_tag) {
journal::TagData tag_data;
tag_data.mirror_uuid = mirror_uuid;
tag_data.predecessor = predecessor;
bufferlist tag_bl;
::encode(tag_data, tag_bl);
C_SaferCond allocate_tag_ctx;
journaler->allocate_tag(tag_class, tag_bl, new_tag, &allocate_tag_ctx);
int r = allocate_tag_ctx.wait();
if (r < 0) {
lderr(cct) << __func__ << ": "
<< "failed to allocate tag: " << cpp_strerror(r) << dendl;
return r;
}
return 0;
}
} // anonymous namespace
// client id for local image
template <typename I>
const std::string Journal<I>::IMAGE_CLIENT_ID("");
// mirror uuid to use for local images
template <typename I>
const std::string Journal<I>::LOCAL_MIRROR_UUID("");
// mirror uuid to use for orphaned (demoted) images
template <typename I>
const std::string Journal<I>::ORPHAN_MIRROR_UUID("<orphan>");
template <typename I>
std::ostream &operator<<(std::ostream &os,
const typename Journal<I>::State &state) {
switch (state) {
case Journal<I>::STATE_UNINITIALIZED:
os << "Uninitialized";
break;
case Journal<I>::STATE_INITIALIZING:
os << "Initializing";
break;
case Journal<I>::STATE_REPLAYING:
os << "Replaying";
break;
case Journal<I>::STATE_FLUSHING_RESTART:
os << "FlushingRestart";
break;
case Journal<I>::STATE_RESTARTING_REPLAY:
os << "RestartingReplay";
break;
case Journal<I>::STATE_FLUSHING_REPLAY:
os << "FlushingReplay";
break;
case Journal<I>::STATE_READY:
os << "Ready";
break;
case Journal<I>::STATE_STOPPING:
os << "Stopping";
break;
case Journal<I>::STATE_CLOSING:
os << "Closing";
break;
case Journal<I>::STATE_CLOSED:
os << "Closed";
break;
default:
os << "Unknown (" << static_cast<uint32_t>(state) << ")";
break;
}
return os;
}
template <typename I>
Journal<I>::Journal(I &image_ctx)
: m_image_ctx(image_ctx), m_journaler(NULL),
m_lock("Journal<I>::m_lock"), m_state(STATE_UNINITIALIZED),
m_error_result(0), m_replay_handler(this), m_close_pending(false),
m_event_lock("Journal<I>::m_event_lock"), m_event_tid(0),
m_blocking_writes(false), m_journal_replay(NULL),
m_metadata_listener(this) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 5) << this << ": ictx=" << &m_image_ctx << dendl;
ThreadPoolSingleton *thread_pool_singleton;
cct->lookup_or_create_singleton_object<ThreadPoolSingleton>(
thread_pool_singleton, "librbd::journal::thread_pool");
m_work_queue = new ContextWQ("librbd::journal::work_queue",
cct->_conf->get_val<int64_t>("rbd_op_thread_timeout"),
thread_pool_singleton);
ImageCtx::get_timer_instance(cct, &m_timer, &m_timer_lock);
}
template <typename I>
Journal<I>::~Journal() {
if (m_work_queue != nullptr) {
m_work_queue->drain();
delete m_work_queue;
}
assert(m_state == STATE_UNINITIALIZED || m_state == STATE_CLOSED);
assert(m_journaler == NULL);
assert(m_journal_replay == NULL);
assert(m_wait_for_state_contexts.empty());
}
template <typename I>
bool Journal<I>::is_journal_supported(I &image_ctx) {
assert(image_ctx.snap_lock.is_locked());
return ((image_ctx.features & RBD_FEATURE_JOURNALING) &&
!image_ctx.read_only && image_ctx.snap_id == CEPH_NOSNAP);
}
template <typename I>
int Journal<I>::create(librados::IoCtx &io_ctx, const std::string &image_id,
uint8_t order, uint8_t splay_width,
const std::string &object_pool) {
CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
ldout(cct, 5) << __func__ << ": image=" << image_id << dendl;
ThreadPool *thread_pool;
ContextWQ *op_work_queue;
ImageCtx::get_thread_pool_instance(cct, &thread_pool, &op_work_queue);
C_SaferCond cond;
journal::TagData tag_data(LOCAL_MIRROR_UUID);
journal::CreateRequest<I> *req = journal::CreateRequest<I>::create(
io_ctx, image_id, order, splay_width, object_pool, cls::journal::Tag::TAG_CLASS_NEW,
tag_data, IMAGE_CLIENT_ID, op_work_queue, &cond);
req->send();
return cond.wait();
}
template <typename I>
int Journal<I>::remove(librados::IoCtx &io_ctx, const std::string &image_id) {
CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
ldout(cct, 5) << __func__ << ": image=" << image_id << dendl;
ThreadPool *thread_pool;
ContextWQ *op_work_queue;
ImageCtx::get_thread_pool_instance(cct, &thread_pool, &op_work_queue);
C_SaferCond cond;
journal::RemoveRequest<I> *req = journal::RemoveRequest<I>::create(
io_ctx, image_id, IMAGE_CLIENT_ID, op_work_queue, &cond);
req->send();
return cond.wait();
}
template <typename I>
int Journal<I>::reset(librados::IoCtx &io_ctx, const std::string &image_id) {
CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
ldout(cct, 5) << __func__ << ": image=" << image_id << dendl;
Journaler journaler(io_ctx, image_id, IMAGE_CLIENT_ID, {});
C_SaferCond cond;
journaler.init(&cond);
BOOST_SCOPE_EXIT_ALL(&journaler) {
journaler.shut_down();
};
int r = cond.wait();
if (r == -ENOENT) {
return 0;
} else if (r < 0) {
lderr(cct) << __func__ << ": "
<< "failed to initialize journal: " << cpp_strerror(r) << dendl;
return r;
}
uint8_t order, splay_width;
int64_t pool_id;
journaler.get_metadata(&order, &splay_width, &pool_id);
std::string pool_name;
if (pool_id != -1) {
librados::Rados rados(io_ctx);
r = rados.pool_reverse_lookup(pool_id, &pool_name);
if (r < 0) {
lderr(cct) << __func__ << ": "
<< "failed to lookup data pool: " << cpp_strerror(r) << dendl;
return r;
}
}
C_SaferCond ctx1;
journaler.remove(true, &ctx1);
r = ctx1.wait();
if (r < 0) {
lderr(cct) << __func__ << ": "
<< "failed to reset journal: " << cpp_strerror(r) << dendl;
return r;
}
r = create(io_ctx, image_id, order, splay_width, pool_name);
if (r < 0) {
lderr(cct) << __func__ << ": "
<< "failed to create journal: " << cpp_strerror(r) << dendl;
return r;
}
return 0;
}
template <typename I>
void Journal<I>::is_tag_owner(I *image_ctx, bool *owner,
Context *on_finish) {
Journal<I>::is_tag_owner(image_ctx->md_ctx, image_ctx->id, owner,
image_ctx->op_work_queue, on_finish);
}
template <typename I>
void Journal<I>::is_tag_owner(librados::IoCtx& io_ctx, std::string& image_id,
bool *is_tag_owner, ContextWQ *op_work_queue,
Context *on_finish) {
CephContext *cct = reinterpret_cast<CephContext*>(io_ctx.cct());
ldout(cct, 20) << __func__ << dendl;
C_IsTagOwner<I> *is_tag_owner_ctx = new C_IsTagOwner<I>(
io_ctx, image_id, is_tag_owner, op_work_queue, on_finish);
get_tags(cct, is_tag_owner_ctx->journaler, &is_tag_owner_ctx->client,
&is_tag_owner_ctx->client_meta, &is_tag_owner_ctx->tag_tid,
&is_tag_owner_ctx->tag_data, is_tag_owner_ctx);
}
template <typename I>
void Journal<I>::get_tag_owner(IoCtx& io_ctx, std::string& image_id,
std::string *mirror_uuid,
ContextWQ *op_work_queue, Context *on_finish) {
CephContext *cct = (CephContext *)io_ctx.cct();
ldout(cct, 20) << __func__ << dendl;
auto ctx = new C_GetTagOwner(io_ctx, image_id, mirror_uuid, on_finish);
get_tags(cct, &ctx->journaler, &ctx->client, &ctx->client_meta, &ctx->tag_tid,
&ctx->tag_data, create_async_context_callback(op_work_queue, ctx));
}
template <typename I>
int Journal<I>::request_resync(I *image_ctx) {
CephContext *cct = image_ctx->cct;
ldout(cct, 20) << __func__ << dendl;
Journaler journaler(image_ctx->md_ctx, image_ctx->id, IMAGE_CLIENT_ID, {});
Mutex lock("lock");
journal::ImageClientMeta client_meta;
uint64_t tag_tid;
journal::TagData tag_data;
C_SaferCond open_ctx;
auto open_req = journal::OpenRequest<I>::create(image_ctx, &journaler, &lock,
&client_meta, &tag_tid,
&tag_data, &open_ctx);
open_req->send();
BOOST_SCOPE_EXIT_ALL(&journaler) {
journaler.shut_down();
};
int r = open_ctx.wait();
if (r < 0) {
return r;
}
client_meta.resync_requested = true;
journal::ClientData client_data(client_meta);
bufferlist client_data_bl;
::encode(client_data, client_data_bl);
C_SaferCond update_client_ctx;
journaler.update_client(client_data_bl, &update_client_ctx);
r = update_client_ctx.wait();
if (r < 0) {
lderr(cct) << __func__ << ": "
<< "failed to update client: " << cpp_strerror(r) << dendl;
return r;
}
return 0;
}
template <typename I>
void Journal<I>::promote(I *image_ctx, Context *on_finish) {
CephContext *cct = image_ctx->cct;
ldout(cct, 20) << __func__ << dendl;
auto promote_req = journal::PromoteRequest<I>::create(image_ctx, false,
on_finish);
promote_req->send();
}
template <typename I>
void Journal<I>::demote(I *image_ctx, Context *on_finish) {
CephContext *cct = image_ctx->cct;
ldout(cct, 20) << __func__ << dendl;
auto req = journal::DemoteRequest<I>::create(*image_ctx, on_finish);
req->send();
}
template <typename I>
bool Journal<I>::is_journal_ready() const {
Mutex::Locker locker(m_lock);
return (m_state == STATE_READY);
}
template <typename I>
bool Journal<I>::is_journal_replaying() const {
Mutex::Locker locker(m_lock);
return is_journal_replaying(m_lock);
}
template <typename I>
bool Journal<I>::is_journal_replaying(const Mutex &) const {
assert(m_lock.is_locked());
return (m_state == STATE_REPLAYING ||
m_state == STATE_FLUSHING_REPLAY ||
m_state == STATE_FLUSHING_RESTART ||
m_state == STATE_RESTARTING_REPLAY);
}
template <typename I>
bool Journal<I>::is_journal_appending() const {
assert(m_image_ctx.snap_lock.is_locked());
Mutex::Locker locker(m_lock);
return (m_state == STATE_READY &&
!m_image_ctx.get_journal_policy()->append_disabled());
}
template <typename I>
void Journal<I>::wait_for_journal_ready(Context *on_ready) {
on_ready = create_async_context_callback(m_image_ctx, on_ready);
Mutex::Locker locker(m_lock);
if (m_state == STATE_READY) {
on_ready->complete(m_error_result);
} else {
wait_for_steady_state(on_ready);
}
}
template <typename I>
void Journal<I>::open(Context *on_finish) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << this << " " << __func__ << dendl;
on_finish = create_async_context_callback(m_image_ctx, on_finish);
Mutex::Locker locker(m_lock);
assert(m_state == STATE_UNINITIALIZED);
wait_for_steady_state(on_finish);
create_journaler();
}
template <typename I>
void Journal<I>::close(Context *on_finish) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << this << " " << __func__ << dendl;
on_finish = create_async_context_callback(m_image_ctx, on_finish);
Mutex::Locker locker(m_lock);
while (m_listener_notify) {
m_listener_cond.Wait(m_lock);
}
Listeners listeners(m_listeners);
m_listener_notify = true;
m_lock.Unlock();
for (auto listener : listeners) {
listener->handle_close();
}
m_lock.Lock();
m_listener_notify = false;
m_listener_cond.Signal();
assert(m_state != STATE_UNINITIALIZED);
if (m_state == STATE_CLOSED) {
on_finish->complete(m_error_result);
return;
}
if (m_state == STATE_READY) {
stop_recording();
}
m_close_pending = true;
wait_for_steady_state(on_finish);
}
template <typename I>
bool Journal<I>::is_tag_owner() const {
Mutex::Locker locker(m_lock);
return is_tag_owner(m_lock);
}
template <typename I>
bool Journal<I>::is_tag_owner(const Mutex &) const {
assert(m_lock.is_locked());
return (m_tag_data.mirror_uuid == LOCAL_MIRROR_UUID);
}
template <typename I>
uint64_t Journal<I>::get_tag_tid() const {
Mutex::Locker locker(m_lock);
return m_tag_tid;
}
template <typename I>
journal::TagData Journal<I>::get_tag_data() const {
Mutex::Locker locker(m_lock);
return m_tag_data;
}
template <typename I>
void Journal<I>::allocate_local_tag(Context *on_finish) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << this << " " << __func__ << dendl;
journal::TagPredecessor predecessor;
predecessor.mirror_uuid = LOCAL_MIRROR_UUID;
{
Mutex::Locker locker(m_lock);
assert(m_journaler != nullptr && is_tag_owner(m_lock));
cls::journal::Client client;
int r = m_journaler->get_cached_client(IMAGE_CLIENT_ID, &client);
if (r < 0) {
lderr(cct) << this << " " << __func__ << ": "
<< "failed to retrieve client: " << cpp_strerror(r) << dendl;
m_image_ctx.op_work_queue->queue(on_finish, r);
return;
}
// since we are primary, populate the predecessor with our known commit
// position
assert(m_tag_data.mirror_uuid == LOCAL_MIRROR_UUID);
if (!client.commit_position.object_positions.empty()) {
auto position = client.commit_position.object_positions.front();
predecessor.commit_valid = true;
predecessor.tag_tid = position.tag_tid;
predecessor.entry_tid = position.entry_tid;
}
}
allocate_tag(LOCAL_MIRROR_UUID, predecessor, on_finish);
}
template <typename I>
void Journal<I>::allocate_tag(const std::string &mirror_uuid,
const journal::TagPredecessor &predecessor,
Context *on_finish) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << this << " " << __func__ << ": mirror_uuid=" << mirror_uuid
<< dendl;
Mutex::Locker locker(m_lock);
assert(m_journaler != nullptr);
journal::TagData tag_data;
tag_data.mirror_uuid = mirror_uuid;
tag_data.predecessor = predecessor;
bufferlist tag_bl;
::encode(tag_data, tag_bl);
C_DecodeTag *decode_tag_ctx = new C_DecodeTag(cct, &m_lock, &m_tag_tid,
&m_tag_data, on_finish);
m_journaler->allocate_tag(m_tag_class, tag_bl, &decode_tag_ctx->tag,
decode_tag_ctx);
}
template <typename I>
void Journal<I>::flush_commit_position(Context *on_finish) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << this << " " << __func__ << dendl;
Mutex::Locker locker(m_lock);
assert(m_journaler != nullptr);
m_journaler->flush_commit_position(on_finish);
}
template <typename I>
uint64_t Journal<I>::append_write_event(uint64_t offset, size_t length,
const bufferlist &bl,
const IOObjectRequests &requests,
bool flush_entry) {
assert(m_max_append_size > journal::AioWriteEvent::get_fixed_size());
uint64_t max_write_data_size =
m_max_append_size - journal::AioWriteEvent::get_fixed_size();
// ensure that the write event fits within the journal entry
Bufferlists bufferlists;
uint64_t bytes_remaining = length;
uint64_t event_offset = 0;
do {
uint64_t event_length = MIN(bytes_remaining, max_write_data_size);
bufferlist event_bl;
event_bl.substr_of(bl, event_offset, event_length);
journal::EventEntry event_entry(journal::AioWriteEvent(offset + event_offset,
event_length,
event_bl),
ceph_clock_now());
bufferlists.emplace_back();
::encode(event_entry, bufferlists.back());
event_offset += event_length;
bytes_remaining -= event_length;
} while (bytes_remaining > 0);
return append_io_events(journal::EVENT_TYPE_AIO_WRITE, bufferlists, requests,
offset, length, flush_entry, 0);
}
template <typename I>
uint64_t Journal<I>::append_io_event(journal::EventEntry &&event_entry,
const IOObjectRequests &requests,
uint64_t offset, size_t length,
bool flush_entry, int filter_ret_val) {
bufferlist bl;
event_entry.timestamp = ceph_clock_now();
::encode(event_entry, bl);
return append_io_events(event_entry.get_event_type(), {bl}, requests, offset,
length, flush_entry, filter_ret_val);
}
template <typename I>
uint64_t Journal<I>::append_io_events(journal::EventType event_type,
const Bufferlists &bufferlists,
const IOObjectRequests &requests,
uint64_t offset, size_t length,
bool flush_entry, int filter_ret_val) {
assert(!bufferlists.empty());
uint64_t tid;
{
Mutex::Locker locker(m_lock);
assert(m_state == STATE_READY);
tid = ++m_event_tid;
assert(tid != 0);
}
Futures futures;
for (auto &bl : bufferlists) {
assert(bl.length() <= m_max_append_size);
futures.push_back(m_journaler->append(m_tag_tid, bl));
}
{
Mutex::Locker event_locker(m_event_lock);
m_events[tid] = Event(futures, requests, offset, length, filter_ret_val);
}
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << this << " " << __func__ << ": "
<< "event=" << event_type << ", "
<< "new_reqs=" << requests.size() << ", "
<< "offset=" << offset << ", "
<< "length=" << length << ", "
<< "flush=" << flush_entry << ", tid=" << tid << dendl;
Context *on_safe = create_async_context_callback(
m_image_ctx, new C_IOEventSafe(this, tid));
if (flush_entry) {
futures.back().flush(on_safe);
} else {
futures.back().wait(on_safe);
}
return tid;
}
template <typename I>
void Journal<I>::commit_io_event(uint64_t tid, int r) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << this << " " << __func__ << ": tid=" << tid << ", "
"r=" << r << dendl;
Mutex::Locker event_locker(m_event_lock);
typename Events::iterator it = m_events.find(tid);
if (it == m_events.end()) {
return;
}
complete_event(it, r);
}
template <typename I>
void Journal<I>::commit_io_event_extent(uint64_t tid, uint64_t offset,
uint64_t length, int r) {
assert(length > 0);
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << this << " " << __func__ << ": tid=" << tid << ", "
<< "offset=" << offset << ", "
<< "length=" << length << ", "
<< "r=" << r << dendl;
Mutex::Locker event_locker(m_event_lock);
typename Events::iterator it = m_events.find(tid);
if (it == m_events.end()) {
return;
}
Event &event = it->second;
if (event.ret_val == 0 && r < 0) {
event.ret_val = r;
}
ExtentInterval extent;
extent.insert(offset, length);
ExtentInterval intersect;
intersect.intersection_of(extent, event.pending_extents);
event.pending_extents.subtract(intersect);
if (!event.pending_extents.empty()) {
ldout(cct, 20) << this << " " << __func__ << ": "
<< "pending extents: " << event.pending_extents << dendl;
return;
}
complete_event(it, event.ret_val);
}
template <typename I>
void Journal<I>::append_op_event(uint64_t op_tid,
journal::EventEntry &&event_entry,
Context *on_safe) {
assert(m_image_ctx.owner_lock.is_locked());
bufferlist bl;
event_entry.timestamp = ceph_clock_now();
::encode(event_entry, bl);
Future future;
{
Mutex::Locker locker(m_lock);
assert(m_state == STATE_READY);
future = m_journaler->append(m_tag_tid, bl);
// delay committing op event to ensure consistent replay
assert(m_op_futures.count(op_tid) == 0);
m_op_futures[op_tid] = future;
}
on_safe = create_async_context_callback(m_image_ctx, on_safe);
on_safe = new FunctionContext([this, on_safe](int r) {
// ensure all committed IO before this op is committed
m_journaler->flush_commit_position(on_safe);
});
future.flush(on_safe);
CephContext *cct = m_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << ": "
<< "op_tid=" << op_tid << ", "
<< "event=" << event_entry.get_event_type() << dendl;
}
template <typename I>
void Journal<I>::commit_op_event(uint64_t op_tid, int r, Context *on_safe) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << ": op_tid=" << op_tid << ", "
<< "r=" << r << dendl;
journal::EventEntry event_entry((journal::OpFinishEvent(op_tid, r)),
ceph_clock_now());
bufferlist bl;
::encode(event_entry, bl);
Future op_start_future;
Future op_finish_future;
{
Mutex::Locker locker(m_lock);
assert(m_state == STATE_READY);
// ready to commit op event
auto it = m_op_futures.find(op_tid);
assert(it != m_op_futures.end());
op_start_future = it->second;
m_op_futures.erase(it);
op_finish_future = m_journaler->append(m_tag_tid, bl);
}
op_finish_future.flush(create_async_context_callback(
m_image_ctx, new C_OpEventSafe(this, op_tid, op_start_future,
op_finish_future, on_safe)));
}
template <typename I>
void Journal<I>::replay_op_ready(uint64_t op_tid, Context *on_resume) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 10) << this << " " << __func__ << ": op_tid=" << op_tid << dendl;
{
Mutex::Locker locker(m_lock);
assert(m_journal_replay != nullptr);
m_journal_replay->replay_op_ready(op_tid, on_resume);
}
}
template <typename I>
void Journal<I>::flush_event(uint64_t tid, Context *on_safe) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << this << " " << __func__ << ": tid=" << tid << ", "
<< "on_safe=" << on_safe << dendl;
Future future;
{
Mutex::Locker event_locker(m_event_lock);
future = wait_event(m_lock, tid, on_safe);
}
if (future.is_valid()) {
future.flush(nullptr);
}
}
template <typename I>
void Journal<I>::wait_event(uint64_t tid, Context *on_safe) {
CephContext *cct = m_image_ctx.cct;
ldout(cct, 20) << this << " " << __func__ << ": tid=" << tid << ", "
<< "on_safe=" << on_safe << dendl;
Mutex::Locker event_locker(m_event_lock);
wait_event(m_lock, tid, on_safe);
}
template <typename I>
typename Journal<I>::Future Journal<I>::wait_event(Mutex &lock, uint64_t tid,
Context *on_safe) {
assert(m_event_lock.is_locked());
CephContext *cct = m_image_ctx.cct;
typename Events::iterator it = m_events.find(tid);
assert(it != m_events.end());
Event &event = it->second;
if (event.safe) {
// journal entry already safe
ldout(cct, 20) << this << " " << __func__ << ": "