+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-
-#include "tools/rbd_mirror/PoolWatcher.h"
-#include "include/rbd_types.h"
-#include "cls/rbd/cls_rbd_client.h"
-#include "common/debug.h"
-#include "common/errno.h"
-#include "common/Timer.h"
-#include "librbd/ImageCtx.h"
-#include "librbd/internal.h"
-#include "librbd/MirroringWatcher.h"
-#include "librbd/Utils.h"
-#include "librbd/api/Image.h"
-#include "librbd/api/Mirror.h"
-#include "tools/rbd_mirror/Threads.h"
-#include "tools/rbd_mirror/pool_watcher/RefreshImagesRequest.h"
-#include <boost/bind.hpp>
-
-#define dout_context g_ceph_context
-#define dout_subsys ceph_subsys_rbd_mirror
-#undef dout_prefix
-#define dout_prefix *_dout << "rbd::mirror::PoolWatcher: " << this << " " \
- << __func__ << ": "
-
-using std::list;
-using std::string;
-using std::unique_ptr;
-using std::vector;
-using librbd::util::create_context_callback;
-using librbd::util::create_rados_callback;
-
-namespace rbd {
-namespace mirror {
-
-template <typename I>
-class PoolWatcher<I>::MirroringWatcher : public librbd::MirroringWatcher<I> {
-public:
- using ContextWQ = typename std::decay<
- typename std::remove_pointer<
- decltype(Threads<I>::work_queue)>::type>::type;
-
- MirroringWatcher(librados::IoCtx &io_ctx, ContextWQ *work_queue,
- PoolWatcher *pool_watcher)
- : librbd::MirroringWatcher<I>(io_ctx, work_queue),
- m_pool_watcher(pool_watcher) {
- }
-
- void handle_rewatch_complete(int r) override {
- m_pool_watcher->handle_rewatch_complete(r);
- }
-
- void handle_mode_updated(cls::rbd::MirrorMode mirror_mode) override {
- // invalidate all image state and refresh the pool contents
- m_pool_watcher->schedule_refresh_images(5);
- }
-
- void handle_image_updated(cls::rbd::MirrorImageState state,
- const std::string &remote_image_id,
- const std::string &global_image_id) override {
- bool enabled = (state == cls::rbd::MIRROR_IMAGE_STATE_ENABLED);
- m_pool_watcher->handle_image_updated(remote_image_id, global_image_id,
- enabled);
- }
-
-private:
- PoolWatcher *m_pool_watcher;
-};
-
-template <typename I>
-PoolWatcher<I>::PoolWatcher(Threads<I> *threads, librados::IoCtx &remote_io_ctx,
- Listener &listener)
- : m_threads(threads), m_remote_io_ctx(remote_io_ctx), m_listener(listener),
- m_lock(librbd::util::unique_lock_name("rbd::mirror::PoolWatcher", this)) {
- m_mirroring_watcher = new MirroringWatcher(m_remote_io_ctx,
- m_threads->work_queue, this);
-}
-
-template <typename I>
-PoolWatcher<I>::~PoolWatcher() {
- delete m_mirroring_watcher;
-}
-
-template <typename I>
-bool PoolWatcher<I>::is_blacklisted() const {
- Mutex::Locker locker(m_lock);
- return m_blacklisted;
-}
-
-template <typename I>
-void PoolWatcher<I>::init(Context *on_finish) {
- dout(5) << dendl;
-
- {
- Mutex::Locker locker(m_lock);
- m_on_init_finish = on_finish;
-
- assert(!m_refresh_in_progress);
- m_refresh_in_progress = true;
- }
-
- // start async updates for mirror image directory
- register_watcher();
-}
-
-template <typename I>
-void PoolWatcher<I>::shut_down(Context *on_finish) {
- dout(5) << dendl;
-
- {
- Mutex::Locker timer_locker(m_threads->timer_lock);
- Mutex::Locker locker(m_lock);
-
- assert(!m_shutting_down);
- m_shutting_down = true;
- if (m_timer_ctx != nullptr) {
- m_threads->timer->cancel_event(m_timer_ctx);
- m_timer_ctx = nullptr;
- }
- }
-
- // in-progress unregister tracked as async op
- unregister_watcher();
-
- m_async_op_tracker.wait_for_ops(on_finish);
-}
-
-template <typename I>
-void PoolWatcher<I>::register_watcher() {
- {
- Mutex::Locker locker(m_lock);
- assert(m_image_ids_invalid);
- assert(m_refresh_in_progress);
- }
-
- // if the watch registration is in-flight, let the watcher
- // handle the transition -- only (re-)register if it's not registered
- if (!m_mirroring_watcher->is_unregistered()) {
- refresh_images();
- return;
- }
-
- // first time registering or the watch failed
- dout(5) << dendl;
- m_async_op_tracker.start_op();
-
- Context *ctx = create_context_callback<
- PoolWatcher, &PoolWatcher<I>::handle_register_watcher>(this);
- m_mirroring_watcher->register_watch(ctx);
-}
-
-template <typename I>
-void PoolWatcher<I>::handle_register_watcher(int r) {
- dout(5) << "r=" << r << dendl;
-
- {
- Mutex::Locker locker(m_lock);
- assert(m_image_ids_invalid);
- assert(m_refresh_in_progress);
- if (r < 0) {
- m_refresh_in_progress = false;
- }
- }
-
- Context *on_init_finish = nullptr;
- if (r >= 0) {
- refresh_images();
- } else if (r == -EBLACKLISTED) {
- dout(0) << "detected client is blacklisted" << dendl;
-
- Mutex::Locker locker(m_lock);
- m_blacklisted = true;
- std::swap(on_init_finish, m_on_init_finish);
- } else if (r == -ENOENT) {
- dout(5) << "mirroring directory does not exist" << dendl;
- schedule_refresh_images(30);
- } else {
- derr << "unexpected error registering mirroring directory watch: "
- << cpp_strerror(r) << dendl;
- schedule_refresh_images(10);
- }
-
- m_async_op_tracker.finish_op();
- if (on_init_finish != nullptr) {
- on_init_finish->complete(r);
- }
-}
-
-template <typename I>
-void PoolWatcher<I>::unregister_watcher() {
- dout(5) << dendl;
-
- m_async_op_tracker.start_op();
- Context *ctx = new FunctionContext([this](int r) {
- dout(5) << "unregister_watcher: r=" << r << dendl;
- if (r < 0) {
- derr << "error unregistering watcher for "
- << m_mirroring_watcher->get_oid() << " object: " << cpp_strerror(r)
- << dendl;
- }
- m_async_op_tracker.finish_op();
- });
-
- m_mirroring_watcher->unregister_watch(ctx);
-}
-
-template <typename I>
-void PoolWatcher<I>::refresh_images() {
- dout(5) << dendl;
-
- {
- Mutex::Locker locker(m_lock);
- assert(m_image_ids_invalid);
- assert(m_refresh_in_progress);
-
- // clear all pending notification events since we need to perform
- // a full image list refresh
- m_pending_added_image_ids.clear();
- m_pending_removed_image_ids.clear();
- }
-
- m_async_op_tracker.start_op();
- m_refresh_image_ids.clear();
- Context *ctx = create_context_callback<
- PoolWatcher, &PoolWatcher<I>::handle_refresh_images>(this);
- auto req = pool_watcher::RefreshImagesRequest<I>::create(m_remote_io_ctx,
- &m_refresh_image_ids,
- ctx);
- req->send();
-}
-
-template <typename I>
-void PoolWatcher<I>::handle_refresh_images(int r) {
- dout(5) << "r=" << r << dendl;
-
- bool retry_refresh = false;
- Context *on_init_finish = nullptr;
- {
- Mutex::Locker locker(m_lock);
- assert(m_image_ids_invalid);
- assert(m_refresh_in_progress);
-
- if (r >= 0) {
- m_pending_image_ids = std::move(m_refresh_image_ids);
- } else if (r == -EBLACKLISTED) {
- dout(0) << "detected client is blacklisted during image refresh" << dendl;
-
- m_blacklisted = true;
- m_refresh_in_progress = false;
- std::swap(on_init_finish, m_on_init_finish);
- } else if (r == -ENOENT) {
- dout(5) << "mirroring directory not found" << dendl;
- m_pending_image_ids.clear();
- r = 0;
- } else {
- m_refresh_in_progress = false;
- retry_refresh = true;
- }
- }
-
- if (retry_refresh) {
- derr << "failed to retrieve mirroring directory: " << cpp_strerror(r)
- << dendl;
- schedule_refresh_images(10);
- } else if (r >= 0) {
- get_mirror_uuid();
- return;
- }
-
- m_async_op_tracker.finish_op();
- if (on_init_finish != nullptr) {
- assert(r == -EBLACKLISTED);
- on_init_finish->complete(r);
- }
-}
-
-template <typename I>
-void PoolWatcher<I>::get_mirror_uuid() {
- dout(5) << dendl;
-
- librados::ObjectReadOperation op;
- librbd::cls_client::mirror_uuid_get_start(&op);
-
- m_out_bl.clear();
- librados::AioCompletion *aio_comp = create_rados_callback<
- PoolWatcher, &PoolWatcher<I>::handle_get_mirror_uuid>(this);
- int r = m_remote_io_ctx.aio_operate(RBD_MIRRORING, aio_comp, &op, &m_out_bl);
- assert(r == 0);
- aio_comp->release();
-}
-
-template <typename I>
-void PoolWatcher<I>::handle_get_mirror_uuid(int r) {
- dout(5) << "r=" << r << dendl;
-
- bool deferred_refresh = false;
- bool retry_refresh = false;
- Context *on_init_finish = nullptr;
- {
- Mutex::Locker locker(m_lock);
- assert(m_image_ids_invalid);
- assert(m_refresh_in_progress);
- m_refresh_in_progress = false;
-
- m_pending_mirror_uuid = "";
- if (r >= 0) {
- bufferlist::iterator it = m_out_bl.begin();
- r = librbd::cls_client::mirror_uuid_get_finish(
- &it, &m_pending_mirror_uuid);
- }
- if (r >= 0 && m_pending_mirror_uuid.empty()) {
- r = -ENOENT;
- }
-
- if (m_deferred_refresh) {
- // need to refresh -- skip the notification
- deferred_refresh = true;
- } else if (r >= 0) {
- dout(10) << "mirror_uuid=" << m_pending_mirror_uuid << dendl;
- m_image_ids_invalid = false;
- std::swap(on_init_finish, m_on_init_finish);
- schedule_listener();
- } else if (r == -EBLACKLISTED) {
- dout(0) << "detected client is blacklisted during image refresh" << dendl;
-
- m_blacklisted = true;
- std::swap(on_init_finish, m_on_init_finish);
- } else if (r == -ENOENT) {
- dout(5) << "mirroring uuid not found" << dendl;
- std::swap(on_init_finish, m_on_init_finish);
- retry_refresh = true;
- } else {
- retry_refresh = true;
- }
- }
-
- if (deferred_refresh) {
- dout(5) << "scheduling deferred refresh" << dendl;
- schedule_refresh_images(0);
- } else if (retry_refresh) {
- derr << "failed to retrieve mirror uuid: " << cpp_strerror(r)
- << dendl;
- schedule_refresh_images(10);
- }
-
- m_async_op_tracker.finish_op();
- if (on_init_finish != nullptr) {
- on_init_finish->complete(r);
- }
-}
-
-template <typename I>
-void PoolWatcher<I>::schedule_refresh_images(double interval) {
- Mutex::Locker timer_locker(m_threads->timer_lock);
- Mutex::Locker locker(m_lock);
- if (m_shutting_down || m_refresh_in_progress || m_timer_ctx != nullptr) {
- if (m_refresh_in_progress && !m_deferred_refresh) {
- dout(5) << "deferring refresh until in-flight refresh completes" << dendl;
- m_deferred_refresh = true;
- }
- return;
- }
-
- m_image_ids_invalid = true;
- m_timer_ctx = m_threads->timer->add_event_after(
- interval,
- new FunctionContext([this](int r) {
- process_refresh_images();
- }));
-}
-
-template <typename I>
-void PoolWatcher<I>::handle_rewatch_complete(int r) {
- dout(5) << "r=" << r << dendl;
-
- if (r == -EBLACKLISTED) {
- dout(0) << "detected client is blacklisted" << dendl;
-
- Mutex::Locker locker(m_lock);
- m_blacklisted = true;
- return;
- } else if (r == -ENOENT) {
- dout(5) << "mirroring directory deleted" << dendl;
- } else if (r < 0) {
- derr << "unexpected error re-registering mirroring directory watch: "
- << cpp_strerror(r) << dendl;
- }
-
- schedule_refresh_images(5);
-}
-
-template <typename I>
-void PoolWatcher<I>::handle_image_updated(const std::string &remote_image_id,
- const std::string &global_image_id,
- bool enabled) {
- dout(10) << "remote_image_id=" << remote_image_id << ", "
- << "global_image_id=" << global_image_id << ", "
- << "enabled=" << enabled << dendl;
-
- Mutex::Locker locker(m_lock);
- ImageId image_id(global_image_id, remote_image_id);
- m_pending_added_image_ids.erase(image_id);
- m_pending_removed_image_ids.erase(image_id);
-
- if (enabled) {
- m_pending_added_image_ids.insert(image_id);
- schedule_listener();
- } else {
- m_pending_removed_image_ids.insert(image_id);
- schedule_listener();
- }
-}
-
-template <typename I>
-void PoolWatcher<I>::process_refresh_images() {
- assert(m_threads->timer_lock.is_locked());
- assert(m_timer_ctx != nullptr);
- m_timer_ctx = nullptr;
-
- {
- Mutex::Locker locker(m_lock);
- assert(!m_refresh_in_progress);
- m_refresh_in_progress = true;
- m_deferred_refresh = false;
- }
-
- // execute outside of the timer's lock
- m_async_op_tracker.start_op();
- Context *ctx = new FunctionContext([this](int r) {
- register_watcher();
- m_async_op_tracker.finish_op();
- });
- m_threads->work_queue->queue(ctx, 0);
-}
-
-template <typename I>
-void PoolWatcher<I>::schedule_listener() {
- assert(m_lock.is_locked());
- m_pending_updates = true;
- if (m_shutting_down || m_image_ids_invalid || m_notify_listener_in_progress) {
- return;
- }
-
- dout(20) << dendl;
-
- m_async_op_tracker.start_op();
- Context *ctx = new FunctionContext([this](int r) {
- notify_listener();
- m_async_op_tracker.finish_op();
- });
-
- m_notify_listener_in_progress = true;
- m_threads->work_queue->queue(ctx, 0);
-}
-
-template <typename I>
-void PoolWatcher<I>::notify_listener() {
- dout(10) << dendl;
-
- std::string mirror_uuid;
- ImageIds added_image_ids;
- ImageIds removed_image_ids;
- {
- Mutex::Locker locker(m_lock);
- assert(m_notify_listener_in_progress);
-
- // if the mirror uuid is updated, treat it as the removal of all
- // images in the pool
- if (m_mirror_uuid != m_pending_mirror_uuid) {
- if (!m_mirror_uuid.empty()) {
- dout(0) << "mirror uuid updated:"
- << "old=" << m_mirror_uuid << ", "
- << "new=" << m_pending_mirror_uuid << dendl;
- }
-
- mirror_uuid = m_mirror_uuid;
- removed_image_ids = std::move(m_image_ids);
- m_image_ids.clear();
- }
- }
-
- if (!removed_image_ids.empty()) {
- m_listener.handle_update(mirror_uuid, {}, std::move(removed_image_ids));
- removed_image_ids.clear();
- }
-
- {
- Mutex::Locker locker(m_lock);
- assert(m_notify_listener_in_progress);
-
- // if the watch failed while we didn't own the lock, we are going
- // to need to perform a full refresh
- if (m_image_ids_invalid) {
- m_notify_listener_in_progress = false;
- return;
- }
-
- // merge add/remove notifications into pending set (a given image
- // can only be in one set or another)
- for (auto &image_id : m_pending_removed_image_ids) {
- dout(20) << "image_id=" << image_id << dendl;
- m_pending_image_ids.erase(image_id);
- }
-
- for (auto &image_id : m_pending_added_image_ids) {
- dout(20) << "image_id=" << image_id << dendl;
- m_pending_image_ids.erase(image_id);
- m_pending_image_ids.insert(image_id);
- }
- m_pending_added_image_ids.clear();
-
- // compute added/removed images
- for (auto &image_id : m_image_ids) {
- auto it = m_pending_image_ids.find(image_id);
- if (it == m_pending_image_ids.end() || it->id != image_id.id) {
- removed_image_ids.insert(image_id);
- }
- }
- for (auto &image_id : m_pending_image_ids) {
- auto it = m_image_ids.find(image_id);
- if (it == m_image_ids.end() || it->id != image_id.id) {
- added_image_ids.insert(image_id);
- }
- }
-
- m_pending_updates = false;
- m_image_ids = m_pending_image_ids;
-
- m_mirror_uuid = m_pending_mirror_uuid;
- mirror_uuid = m_mirror_uuid;
- }
-
- m_listener.handle_update(mirror_uuid, std::move(added_image_ids),
- std::move(removed_image_ids));
-
- {
- Mutex::Locker locker(m_lock);
- m_notify_listener_in_progress = false;
- if (m_pending_updates) {
- schedule_listener();
- }
- }
-}
-
-} // namespace mirror
-} // namespace rbd
-
-template class rbd::mirror::PoolWatcher<librbd::ImageCtx>;
Code Review / stor4nfv.git / blobdiff