--- /dev/null
+// -*- 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;
+ 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;
+ 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);
+}
+
+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) {
+ 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);
+}
+
+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) {
+ 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);
+ }
+
+ 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__ << ": "
+ << "journal entry already safe" << dendl;
+ m_image_ctx.op_work_queue->queue(on_safe, event.ret_val);
+ return Future();
+ }
+
+ event.on_safe_contexts.push_back(create_async_context_callback(m_image_ctx,
+ on_safe));
+ return event.futures.back();
+}
+
+template <typename I>
+void Journal<I>::start_external_replay(journal::Replay<I> **journal_replay,
+ Context *on_start) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << dendl;
+
+ Mutex::Locker locker(m_lock);
+ assert(m_state == STATE_READY);
+ assert(m_journal_replay == nullptr);
+
+ on_start = util::create_async_context_callback(m_image_ctx, on_start);
+ on_start = new FunctionContext(
+ [this, journal_replay, on_start](int r) {
+ handle_start_external_replay(r, journal_replay, on_start);
+ });
+
+ // safely flush all in-flight events before starting external replay
+ m_journaler->stop_append(util::create_async_context_callback(m_image_ctx,
+ on_start));
+}
+
+template <typename I>
+void Journal<I>::handle_start_external_replay(int r,
+ journal::Replay<I> **journal_replay,
+ Context *on_finish) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << dendl;
+
+ Mutex::Locker locker(m_lock);
+ assert(m_state == STATE_READY);
+ assert(m_journal_replay == nullptr);
+
+ if (r < 0) {
+ lderr(cct) << this << " " << __func__ << ": "
+ << "failed to stop recording: " << cpp_strerror(r) << dendl;
+ *journal_replay = nullptr;
+
+ // get back to a sane-state
+ start_append();
+ on_finish->complete(r);
+ return;
+ }
+
+ transition_state(STATE_REPLAYING, 0);
+ m_journal_replay = journal::Replay<I>::create(m_image_ctx);
+ *journal_replay = m_journal_replay;
+ on_finish->complete(0);
+}
+
+template <typename I>
+void Journal<I>::stop_external_replay() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << dendl;
+
+ Mutex::Locker locker(m_lock);
+ assert(m_journal_replay != nullptr);
+ assert(m_state == STATE_REPLAYING);
+
+ delete m_journal_replay;
+ m_journal_replay = nullptr;
+
+ if (m_close_pending) {
+ destroy_journaler(0);
+ return;
+ }
+
+ start_append();
+}
+
+template <typename I>
+void Journal<I>::create_journaler() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << dendl;
+
+ assert(m_lock.is_locked());
+ assert(m_state == STATE_UNINITIALIZED || m_state == STATE_RESTARTING_REPLAY);
+ assert(m_journaler == NULL);
+
+ transition_state(STATE_INITIALIZING, 0);
+ ::journal::Settings settings;
+ settings.commit_interval = m_image_ctx.journal_commit_age;
+ settings.max_payload_bytes = m_image_ctx.journal_max_payload_bytes;
+ settings.max_concurrent_object_sets =
+ m_image_ctx.journal_max_concurrent_object_sets;
+ // TODO: a configurable filter to exclude certain peers from being
+ // disconnected.
+ settings.whitelisted_laggy_clients = {IMAGE_CLIENT_ID};
+
+ m_journaler = new Journaler(m_work_queue, m_timer, m_timer_lock,
+ m_image_ctx.md_ctx, m_image_ctx.id,
+ IMAGE_CLIENT_ID, settings);
+ m_journaler->add_listener(&m_metadata_listener);
+
+ Context *ctx = create_async_context_callback(
+ m_image_ctx, create_context_callback<
+ Journal<I>, &Journal<I>::handle_open>(this));
+ auto open_req = journal::OpenRequest<I>::create(&m_image_ctx, m_journaler,
+ &m_lock, &m_client_meta,
+ &m_tag_tid, &m_tag_data, ctx);
+ open_req->send();
+}
+
+template <typename I>
+void Journal<I>::destroy_journaler(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << ": r=" << r << dendl;
+
+ assert(m_lock.is_locked());
+
+ delete m_journal_replay;
+ m_journal_replay = NULL;
+
+ m_journaler->remove_listener(&m_metadata_listener);
+
+ transition_state(STATE_CLOSING, r);
+
+ Context *ctx = create_async_context_callback(
+ m_image_ctx, create_context_callback<
+ Journal<I>, &Journal<I>::handle_journal_destroyed>(this));
+ ctx = new FunctionContext(
+ [this, ctx](int r) {
+ Mutex::Locker locker(m_lock);
+ m_journaler->shut_down(ctx);
+ });
+ m_async_journal_op_tracker.wait(m_image_ctx, ctx);
+}
+
+template <typename I>
+void Journal<I>::recreate_journaler(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << ": r=" << r << dendl;
+
+ assert(m_lock.is_locked());
+ assert(m_state == STATE_FLUSHING_RESTART ||
+ m_state == STATE_FLUSHING_REPLAY);
+
+ delete m_journal_replay;
+ m_journal_replay = NULL;
+
+ m_journaler->remove_listener(&m_metadata_listener);
+
+ transition_state(STATE_RESTARTING_REPLAY, r);
+ m_journaler->shut_down(create_async_context_callback(
+ m_image_ctx, create_context_callback<
+ Journal<I>, &Journal<I>::handle_journal_destroyed>(this)));
+}
+
+template <typename I>
+void Journal<I>::complete_event(typename Events::iterator it, int r) {
+ assert(m_event_lock.is_locked());
+ assert(m_state == STATE_READY);
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << ": tid=" << it->first << " "
+ << "r=" << r << dendl;
+
+ Event &event = it->second;
+ if (r < 0) {
+ // event recorded to journal but failed to update disk, we cannot
+ // commit this IO event. this event must be replayed.
+ assert(event.safe);
+ lderr(cct) << this << " " << __func__ << ": "
+ << "failed to commit IO to disk, replay required: "
+ << cpp_strerror(r) << dendl;
+ }
+
+ event.committed_io = true;
+ if (event.safe) {
+ if (r >= 0) {
+ for (auto &future : event.futures) {
+ m_journaler->committed(future);
+ }
+ }
+ m_events.erase(it);
+ }
+}
+
+template <typename I>
+void Journal<I>::start_append() {
+ assert(m_lock.is_locked());
+ m_journaler->start_append(m_image_ctx.journal_object_flush_interval,
+ m_image_ctx.journal_object_flush_bytes,
+ m_image_ctx.journal_object_flush_age);
+ transition_state(STATE_READY, 0);
+}
+
+template <typename I>
+void Journal<I>::handle_open(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << ": r=" << r << dendl;
+
+ Mutex::Locker locker(m_lock);
+ assert(m_state == STATE_INITIALIZING);
+
+ if (r < 0) {
+ lderr(cct) << this << " " << __func__ << ": "
+ << "failed to initialize journal: " << cpp_strerror(r)
+ << dendl;
+ destroy_journaler(r);
+ return;
+ }
+
+ m_tag_class = m_client_meta.tag_class;
+ m_max_append_size = m_journaler->get_max_append_size();
+ ldout(cct, 20) << this << " " << __func__ << ": "
+ << "tag_class=" << m_tag_class << ", "
+ << "max_append_size=" << m_max_append_size << dendl;
+
+ transition_state(STATE_REPLAYING, 0);
+ m_journal_replay = journal::Replay<I>::create(m_image_ctx);
+ m_journaler->start_replay(&m_replay_handler);
+}
+
+template <typename I>
+void Journal<I>::handle_replay_ready() {
+ CephContext *cct = m_image_ctx.cct;
+ ReplayEntry replay_entry;
+ {
+ Mutex::Locker locker(m_lock);
+ if (m_state != STATE_REPLAYING) {
+ return;
+ }
+
+ ldout(cct, 20) << this << " " << __func__ << dendl;
+ if (!m_journaler->try_pop_front(&replay_entry)) {
+ return;
+ }
+
+ // only one entry should be in-flight at a time
+ assert(!m_processing_entry);
+ m_processing_entry = true;
+ }
+
+ bufferlist data = replay_entry.get_data();
+ bufferlist::iterator it = data.begin();
+
+ journal::EventEntry event_entry;
+ int r = m_journal_replay->decode(&it, &event_entry);
+ if (r < 0) {
+ lderr(cct) << this << " " << __func__ << ": "
+ << "failed to decode journal event entry" << dendl;
+ handle_replay_process_safe(replay_entry, r);
+ return;
+ }
+
+ Context *on_ready = create_context_callback<
+ Journal<I>, &Journal<I>::handle_replay_process_ready>(this);
+ Context *on_commit = new C_ReplayProcessSafe(this, std::move(replay_entry));
+ m_journal_replay->process(event_entry, on_ready, on_commit);
+}
+
+template <typename I>
+void Journal<I>::handle_replay_complete(int r) {
+ CephContext *cct = m_image_ctx.cct;
+
+ bool cancel_ops = false;
+ {
+ Mutex::Locker locker(m_lock);
+ if (m_state != STATE_REPLAYING) {
+ return;
+ }
+
+ ldout(cct, 20) << this << " " << __func__ << ": r=" << r << dendl;
+ if (r < 0) {
+ cancel_ops = true;
+ transition_state(STATE_FLUSHING_RESTART, r);
+ } else {
+ // state might change back to FLUSHING_RESTART on flush error
+ transition_state(STATE_FLUSHING_REPLAY, 0);
+ }
+ }
+
+ Context *ctx = new FunctionContext([this, cct](int r) {
+ ldout(cct, 20) << this << " handle_replay_complete: "
+ << "handle shut down replay" << dendl;
+
+ State state;
+ {
+ Mutex::Locker locker(m_lock);
+ assert(m_state == STATE_FLUSHING_RESTART ||
+ m_state == STATE_FLUSHING_REPLAY);
+ state = m_state;
+ }
+
+ if (state == STATE_FLUSHING_RESTART) {
+ handle_flushing_restart(0);
+ } else {
+ handle_flushing_replay();
+ }
+ });
+ ctx = new FunctionContext([this, cct, cancel_ops, ctx](int r) {
+ ldout(cct, 20) << this << " handle_replay_complete: "
+ << "shut down replay" << dendl;
+ m_journal_replay->shut_down(cancel_ops, ctx);
+ });
+ m_journaler->stop_replay(ctx);
+}
+
+template <typename I>
+void Journal<I>::handle_replay_process_ready(int r) {
+ // journal::Replay is ready for more events -- attempt to pop another
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << dendl;
+
+ assert(r == 0);
+ {
+ Mutex::Locker locker(m_lock);
+ assert(m_processing_entry);
+ m_processing_entry = false;
+ }
+ handle_replay_ready();
+}
+
+template <typename I>
+void Journal<I>::handle_replay_process_safe(ReplayEntry replay_entry, int r) {
+ CephContext *cct = m_image_ctx.cct;
+
+ m_lock.Lock();
+ assert(m_state == STATE_REPLAYING ||
+ m_state == STATE_FLUSHING_RESTART ||
+ m_state == STATE_FLUSHING_REPLAY);
+
+ ldout(cct, 20) << this << " " << __func__ << ": r=" << r << dendl;
+ if (r < 0) {
+ if (r != -ECANCELED) {
+ lderr(cct) << this << " " << __func__ << ": "
+ << "failed to commit journal event to disk: "
+ << cpp_strerror(r) << dendl;
+ }
+
+ if (m_state == STATE_REPLAYING) {
+ // abort the replay if we have an error
+ transition_state(STATE_FLUSHING_RESTART, r);
+ m_lock.Unlock();
+
+ // stop replay, shut down, and restart
+ Context *ctx = new FunctionContext([this, cct](int r) {
+ ldout(cct, 20) << this << " handle_replay_process_safe: "
+ << "shut down replay" << dendl;
+ {
+ Mutex::Locker locker(m_lock);
+ assert(m_state == STATE_FLUSHING_RESTART);
+ }
+
+ m_journal_replay->shut_down(true, create_context_callback<
+ Journal<I>, &Journal<I>::handle_flushing_restart>(this));
+ });
+ m_journaler->stop_replay(ctx);
+ return;
+ } else if (m_state == STATE_FLUSHING_REPLAY) {
+ // end-of-replay flush in-progress -- we need to restart replay
+ transition_state(STATE_FLUSHING_RESTART, r);
+ m_lock.Unlock();
+ return;
+ }
+ } else {
+ // only commit the entry if written successfully
+ m_journaler->committed(replay_entry);
+ }
+ m_lock.Unlock();
+}
+
+template <typename I>
+void Journal<I>::handle_flushing_restart(int r) {
+ Mutex::Locker locker(m_lock);
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << dendl;
+
+ assert(r == 0);
+ assert(m_state == STATE_FLUSHING_RESTART);
+ if (m_close_pending) {
+ destroy_journaler(r);
+ return;
+ }
+
+ recreate_journaler(r);
+}
+
+template <typename I>
+void Journal<I>::handle_flushing_replay() {
+ Mutex::Locker locker(m_lock);
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << dendl;
+
+ assert(m_state == STATE_FLUSHING_REPLAY || m_state == STATE_FLUSHING_RESTART);
+ if (m_close_pending) {
+ destroy_journaler(0);
+ return;
+ } else if (m_state == STATE_FLUSHING_RESTART) {
+ // failed to replay one-or-more events -- restart
+ recreate_journaler(0);
+ return;
+ }
+
+ delete m_journal_replay;
+ m_journal_replay = NULL;
+
+ m_error_result = 0;
+ start_append();
+}
+
+template <typename I>
+void Journal<I>::handle_recording_stopped(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << ": r=" << r << dendl;
+
+ Mutex::Locker locker(m_lock);
+ assert(m_state == STATE_STOPPING);
+
+ destroy_journaler(r);
+}
+
+template <typename I>
+void Journal<I>::handle_journal_destroyed(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << ": r=" << r << dendl;
+
+ if (r < 0) {
+ lderr(cct) << this << " " << __func__
+ << "error detected while closing journal: " << cpp_strerror(r)
+ << dendl;
+ }
+
+ Mutex::Locker locker(m_lock);
+ delete m_journaler;
+ m_journaler = nullptr;
+
+ assert(m_state == STATE_CLOSING || m_state == STATE_RESTARTING_REPLAY);
+ if (m_state == STATE_RESTARTING_REPLAY) {
+ create_journaler();
+ return;
+ }
+
+ transition_state(STATE_CLOSED, r);
+}
+
+template <typename I>
+void Journal<I>::handle_io_event_safe(int r, uint64_t tid) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << ": r=" << r << ", "
+ << "tid=" << tid << dendl;
+
+ // journal will be flushed before closing
+ assert(m_state == STATE_READY || m_state == STATE_STOPPING);
+ if (r < 0) {
+ lderr(cct) << this << " " << __func__ << ": "
+ << "failed to commit IO event: " << cpp_strerror(r) << dendl;
+ }
+
+ IOObjectRequests aio_object_requests;
+ Contexts on_safe_contexts;
+ {
+ Mutex::Locker event_locker(m_event_lock);
+ typename Events::iterator it = m_events.find(tid);
+ assert(it != m_events.end());
+
+ Event &event = it->second;
+ aio_object_requests.swap(event.aio_object_requests);
+ on_safe_contexts.swap(event.on_safe_contexts);
+
+ if (r < 0 || event.committed_io) {
+ // failed journal write so IO won't be sent -- or IO extent was
+ // overwritten by future IO operations so this was a no-op IO event
+ event.ret_val = r;
+ for (auto &future : event.futures) {
+ m_journaler->committed(future);
+ }
+ }
+
+ if (event.committed_io) {
+ m_events.erase(it);
+ } else {
+ event.safe = true;
+ }
+ }
+
+ ldout(cct, 20) << this << " " << __func__ << ": "
+ << "completing tid=" << tid << dendl;
+ for (IOObjectRequests::iterator it = aio_object_requests.begin();
+ it != aio_object_requests.end(); ++it) {
+ if (r < 0) {
+ // don't send aio requests if the journal fails -- bubble error up
+ (*it)->complete(r);
+ } else {
+ // send any waiting aio requests now that journal entry is safe
+ (*it)->send();
+ }
+ }
+
+ // alert the cache about the journal event status
+ for (Contexts::iterator it = on_safe_contexts.begin();
+ it != on_safe_contexts.end(); ++it) {
+ (*it)->complete(r);
+ }
+}
+
+template <typename I>
+void Journal<I>::handle_op_event_safe(int r, uint64_t tid,
+ const Future &op_start_future,
+ const Future &op_finish_future,
+ Context *on_safe) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << ": r=" << r << ", "
+ << "tid=" << tid << dendl;
+
+ // journal will be flushed before closing
+ assert(m_state == STATE_READY || m_state == STATE_STOPPING);
+ if (r < 0) {
+ lderr(cct) << this << " " << __func__ << ": "
+ << "failed to commit op event: " << cpp_strerror(r) << dendl;
+ }
+
+ m_journaler->committed(op_start_future);
+ m_journaler->committed(op_finish_future);
+
+ // reduce the replay window after committing an op event
+ m_journaler->flush_commit_position(on_safe);
+}
+
+template <typename I>
+void Journal<I>::stop_recording() {
+ assert(m_lock.is_locked());
+ assert(m_journaler != NULL);
+
+ assert(m_state == STATE_READY);
+ transition_state(STATE_STOPPING, 0);
+
+ m_journaler->stop_append(util::create_async_context_callback(
+ m_image_ctx, create_context_callback<
+ Journal<I>, &Journal<I>::handle_recording_stopped>(this)));
+}
+
+template <typename I>
+void Journal<I>::transition_state(State state, int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << ": new state=" << state << dendl;
+ assert(m_lock.is_locked());
+ m_state = state;
+
+ if (m_error_result == 0 && r < 0) {
+ m_error_result = r;
+ }
+
+ if (is_steady_state()) {
+ Contexts wait_for_state_contexts(std::move(m_wait_for_state_contexts));
+ for (auto ctx : wait_for_state_contexts) {
+ ctx->complete(m_error_result);
+ }
+ }
+}
+
+template <typename I>
+bool Journal<I>::is_steady_state() const {
+ assert(m_lock.is_locked());
+ switch (m_state) {
+ case STATE_READY:
+ case STATE_CLOSED:
+ return true;
+ case STATE_UNINITIALIZED:
+ case STATE_INITIALIZING:
+ case STATE_REPLAYING:
+ case STATE_FLUSHING_RESTART:
+ case STATE_RESTARTING_REPLAY:
+ case STATE_FLUSHING_REPLAY:
+ case STATE_STOPPING:
+ case STATE_CLOSING:
+ break;
+ }
+ return false;
+}
+
+template <typename I>
+void Journal<I>::wait_for_steady_state(Context *on_state) {
+ assert(m_lock.is_locked());
+ assert(!is_steady_state());
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << ": on_state=" << on_state
+ << dendl;
+ m_wait_for_state_contexts.push_back(on_state);
+}
+
+template <typename I>
+int Journal<I>::is_resync_requested(bool *do_resync) {
+ Mutex::Locker l(m_lock);
+ return check_resync_requested(do_resync);
+}
+
+template <typename I>
+int Journal<I>::check_resync_requested(bool *do_resync) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << this << " " << __func__ << dendl;
+
+ assert(m_lock.is_locked());
+ assert(do_resync != nullptr);
+
+ 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;
+ return r;
+ }
+
+ 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 << " " << __func__ << ": "
+ << "failed to decode client data: " << err << dendl;
+ return -EINVAL;
+ }
+
+ journal::ImageClientMeta *image_client_meta =
+ boost::get<journal::ImageClientMeta>(&client_data.client_meta);
+ if (image_client_meta == nullptr) {
+ lderr(cct) << this << " " << __func__ << ": "
+ << "failed to access image client meta struct" << dendl;
+ return -EINVAL;
+ }
+
+ *do_resync = image_client_meta->resync_requested;
+
+ return 0;
+}
+
+struct C_RefreshTags : public Context {
+ util::AsyncOpTracker &async_op_tracker;
+ Context *on_finish = nullptr;
+
+ Mutex lock;
+ uint64_t tag_tid;
+ journal::TagData tag_data;
+
+ C_RefreshTags(util::AsyncOpTracker &async_op_tracker)
+ : async_op_tracker(async_op_tracker),
+ lock("librbd::Journal::C_RefreshTags::lock") {
+ async_op_tracker.start_op();
+ }
+ ~C_RefreshTags() override {
+ async_op_tracker.finish_op();
+ }
+
+ void finish(int r) override {
+ on_finish->complete(r);
+ }
+};
+
+template <typename I>
+void Journal<I>::handle_metadata_updated() {
+ CephContext *cct = m_image_ctx.cct;
+ Mutex::Locker locker(m_lock);
+
+ if (m_state != STATE_READY && !is_journal_replaying(m_lock)) {
+ return;
+ } else if (is_tag_owner(m_lock)) {
+ ldout(cct, 20) << this << " " << __func__ << ": primary image" << dendl;
+ return;
+ } else if (m_listeners.empty()) {
+ ldout(cct, 20) << this << " " << __func__ << ": no listeners" << dendl;
+ return;
+ }
+
+ uint64_t refresh_sequence = ++m_refresh_sequence;
+ ldout(cct, 20) << this << " " << __func__ << ": "
+ << "refresh_sequence=" << refresh_sequence << dendl;
+
+ // pull the most recent tags from the journal, decode, and
+ // update the internal tag state
+ C_RefreshTags *refresh_ctx = new C_RefreshTags(m_async_journal_op_tracker);
+ refresh_ctx->on_finish = new FunctionContext(
+ [this, refresh_sequence, refresh_ctx](int r) {
+ handle_refresh_metadata(refresh_sequence, refresh_ctx->tag_tid,
+ refresh_ctx->tag_data, r);
+ });
+ C_DecodeTags *decode_tags_ctx = new C_DecodeTags(
+ cct, &refresh_ctx->lock, &refresh_ctx->tag_tid,
+ &refresh_ctx->tag_data, refresh_ctx);
+ m_journaler->get_tags(m_tag_tid == 0 ? 0 : m_tag_tid - 1, m_tag_class,
+ &decode_tags_ctx->tags, decode_tags_ctx);
+}
+
+template <typename I>
+void Journal<I>::handle_refresh_metadata(uint64_t refresh_sequence,
+ uint64_t tag_tid,
+ journal::TagData tag_data, int r) {
+ CephContext *cct = m_image_ctx.cct;
+ Mutex::Locker locker(m_lock);
+
+ if (r < 0) {
+ lderr(cct) << this << " " << __func__ << ": failed to refresh metadata: "
+ << cpp_strerror(r) << dendl;
+ return;
+ } else if (m_state != STATE_READY && !is_journal_replaying(m_lock)) {
+ return;
+ } else if (refresh_sequence != m_refresh_sequence) {
+ // another, more up-to-date refresh is in-flight
+ return;
+ }
+
+ ldout(cct, 20) << this << " " << __func__ << ": "
+ << "refresh_sequence=" << refresh_sequence << ", "
+ << "tag_tid=" << tag_tid << ", "
+ << "tag_data=" << tag_data << dendl;
+ while (m_listener_notify) {
+ m_listener_cond.Wait(m_lock);
+ }
+
+ bool was_tag_owner = is_tag_owner(m_lock);
+ if (m_tag_tid < tag_tid) {
+ m_tag_tid = tag_tid;
+ m_tag_data = tag_data;
+ }
+ bool promoted_to_primary = (!was_tag_owner && is_tag_owner(m_lock));
+
+ bool resync_requested = false;
+ r = check_resync_requested(&resync_requested);
+ if (r < 0) {
+ lderr(cct) << this << " " << __func__ << ": "
+ << "failed to check if a resync was requested" << dendl;
+ return;
+ }
+
+ Listeners listeners(m_listeners);
+ m_listener_notify = true;
+ m_lock.Unlock();
+
+ if (promoted_to_primary) {
+ for (auto listener : listeners) {
+ listener->handle_promoted();
+ }
+ } else if (resync_requested) {
+ for (auto listener : listeners) {
+ listener->handle_resync();
+ }
+ }
+
+ m_lock.Lock();
+ m_listener_notify = false;
+ m_listener_cond.Signal();
+}
+
+template <typename I>
+void Journal<I>::add_listener(journal::Listener *listener) {
+ Mutex::Locker locker(m_lock);
+ m_listeners.insert(listener);
+}
+
+template <typename I>
+void Journal<I>::remove_listener(journal::Listener *listener) {
+ Mutex::Locker locker(m_lock);
+ while (m_listener_notify) {
+ m_listener_cond.Wait(m_lock);
+ }
+ m_listeners.erase(listener);
+}
+
+} // namespace librbd
+
+#ifndef TEST_F
+template class librbd::Journal<librbd::ImageCtx>;
+#endif
Code Review / stor4nfv.git / blobdiff