X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Ftools%2Frbd_mirror%2FPoolWatcher.cc;fp=src%2Fceph%2Fsrc%2Ftools%2Frbd_mirror%2FPoolWatcher.cc;h=8d60aa4f47a8c6a440a3b89545381c57a8bbaae3;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/tools/rbd_mirror/PoolWatcher.cc b/src/ceph/src/tools/rbd_mirror/PoolWatcher.cc
new file mode 100644
index 0000000..8d60aa4
--- /dev/null
+++ b/src/ceph/src/tools/rbd_mirror/PoolWatcher.cc
@@ -0,0 +1,548 @@
+// -*- 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>;