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-rw-r--r--src/librbd/exclusive_lock/PreReleaseRequest.cc363
1 files changed, 363 insertions, 0 deletions
diff --git a/src/librbd/exclusive_lock/PreReleaseRequest.cc b/src/librbd/exclusive_lock/PreReleaseRequest.cc
new file mode 100644
index 000000000..a9cd1248a
--- /dev/null
+++ b/src/librbd/exclusive_lock/PreReleaseRequest.cc
@@ -0,0 +1,363 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/exclusive_lock/PreReleaseRequest.h"
+#include "common/AsyncOpTracker.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "librbd/ExclusiveLock.h"
+#include "librbd/ImageState.h"
+#include "librbd/ImageWatcher.h"
+#include "librbd/Journal.h"
+#include "librbd/ObjectMap.h"
+#include "librbd/Utils.h"
+#include "librbd/exclusive_lock/ImageDispatch.h"
+#include "librbd/io/AioCompletion.h"
+#include "librbd/io/ImageDispatchSpec.h"
+#include "librbd/io/ImageDispatcherInterface.h"
+#include "librbd/io/ObjectDispatcherInterface.h"
+#include "librbd/io/Types.h"
+#include "librbd/PluginRegistry.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::exclusive_lock::PreReleaseRequest: " \
+ << this << " " << __func__ << ": "
+
+namespace librbd {
+namespace exclusive_lock {
+
+using util::create_async_context_callback;
+using util::create_context_callback;
+
+template <typename I>
+PreReleaseRequest<I>* PreReleaseRequest<I>::create(
+ I &image_ctx, ImageDispatch<I>* image_dispatch, bool shutting_down,
+ AsyncOpTracker &async_op_tracker, Context *on_finish) {
+ return new PreReleaseRequest(image_ctx, image_dispatch, shutting_down,
+ async_op_tracker, on_finish);
+}
+
+template <typename I>
+PreReleaseRequest<I>::PreReleaseRequest(I &image_ctx,
+ ImageDispatch<I>* image_dispatch,
+ bool shutting_down,
+ AsyncOpTracker &async_op_tracker,
+ Context *on_finish)
+ : m_image_ctx(image_ctx), m_image_dispatch(image_dispatch),
+ m_shutting_down(shutting_down), m_async_op_tracker(async_op_tracker),
+ m_on_finish(create_async_context_callback(image_ctx, on_finish)) {
+}
+
+template <typename I>
+PreReleaseRequest<I>::~PreReleaseRequest() {
+ if (!m_shutting_down) {
+ m_image_ctx.state->handle_prepare_lock_complete();
+ }
+}
+
+template <typename I>
+void PreReleaseRequest<I>::send() {
+ send_cancel_op_requests();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::send_cancel_op_requests() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ using klass = PreReleaseRequest<I>;
+ Context *ctx = create_context_callback<
+ klass, &klass::handle_cancel_op_requests>(this);
+ m_image_ctx.cancel_async_requests(ctx);
+}
+
+template <typename I>
+void PreReleaseRequest<I>::handle_cancel_op_requests(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ ceph_assert(r == 0);
+
+ send_set_require_lock();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::send_set_require_lock() {
+ if (!m_image_ctx.test_features(RBD_FEATURE_EXCLUSIVE_LOCK)) {
+ // exclusive-lock was disabled, no need to block IOs
+ send_wait_for_ops();
+ return;
+ }
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ using klass = PreReleaseRequest<I>;
+ Context *ctx = create_context_callback<
+ klass, &klass::handle_set_require_lock>(this);
+
+ // setting the lock as required will automatically cause the IO
+ // queue to re-request the lock if any IO is queued
+ if (m_image_ctx.clone_copy_on_read ||
+ m_image_ctx.test_features(RBD_FEATURE_JOURNALING) ||
+ m_image_ctx.test_features(RBD_FEATURE_DIRTY_CACHE)) {
+ m_image_dispatch->set_require_lock(m_shutting_down,
+ io::DIRECTION_BOTH, ctx);
+ } else {
+ m_image_dispatch->set_require_lock(m_shutting_down,
+ io::DIRECTION_WRITE, ctx);
+ }
+}
+
+template <typename I>
+void PreReleaseRequest<I>::handle_set_require_lock(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ if (r < 0) {
+ // IOs are still flushed regardless of the error
+ lderr(cct) << "failed to set lock: " << cpp_strerror(r) << dendl;
+ }
+
+ send_wait_for_ops();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::send_wait_for_ops() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ Context *ctx = create_context_callback<
+ PreReleaseRequest<I>, &PreReleaseRequest<I>::handle_wait_for_ops>(this);
+ m_async_op_tracker.wait_for_ops(ctx);
+}
+
+template <typename I>
+void PreReleaseRequest<I>::handle_wait_for_ops(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ send_prepare_lock();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::send_prepare_lock() {
+ if (m_shutting_down) {
+ send_process_plugin_release_lock();
+ return;
+ }
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ // release the lock if the image is not busy performing other actions
+ Context *ctx = create_context_callback<
+ PreReleaseRequest<I>, &PreReleaseRequest<I>::handle_prepare_lock>(this);
+ m_image_ctx.state->prepare_lock(ctx);
+}
+
+template <typename I>
+void PreReleaseRequest<I>::handle_prepare_lock(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ send_process_plugin_release_lock();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::send_process_plugin_release_lock() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ std::shared_lock owner_lock{m_image_ctx.owner_lock};
+ Context *ctx = create_async_context_callback(m_image_ctx, create_context_callback<
+ PreReleaseRequest<I>,
+ &PreReleaseRequest<I>::handle_process_plugin_release_lock>(this));
+ m_image_ctx.plugin_registry->prerelease_exclusive_lock(ctx);
+}
+
+template <typename I>
+void PreReleaseRequest<I>::handle_process_plugin_release_lock(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ if (r < 0) {
+ lderr(cct) << "failed to handle plugins before releasing lock: "
+ << cpp_strerror(r) << dendl;
+ m_image_dispatch->unset_require_lock(io::DIRECTION_BOTH);
+ save_result(r);
+ finish();
+ return;
+ }
+
+ send_invalidate_cache();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::send_invalidate_cache() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ Context *ctx = create_context_callback<
+ PreReleaseRequest<I>,
+ &PreReleaseRequest<I>::handle_invalidate_cache>(this);
+ m_image_ctx.io_image_dispatcher->invalidate_cache(ctx);
+}
+
+template <typename I>
+void PreReleaseRequest<I>::handle_invalidate_cache(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ if (r < 0 && r != -EBLOCKLISTED && r != -EBUSY) {
+ lderr(cct) << "failed to invalidate cache: " << cpp_strerror(r)
+ << dendl;
+ m_image_dispatch->unset_require_lock(io::DIRECTION_BOTH);
+ save_result(r);
+ finish();
+ return;
+ }
+
+ send_flush_io();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::send_flush_io() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ // ensure that all in-flight IO is flushed -- skipping the refresh layer
+ // since it should have been flushed when the lock was required and now
+ // refreshes are disabled / interlocked w/ this state machine.
+ auto ctx = create_context_callback<
+ PreReleaseRequest<I>, &PreReleaseRequest<I>::handle_flush_io>(this);
+ auto aio_comp = io::AioCompletion::create_and_start(
+ ctx, util::get_image_ctx(&m_image_ctx), librbd::io::AIO_TYPE_FLUSH);
+ auto req = io::ImageDispatchSpec::create_flush(
+ m_image_ctx, io::IMAGE_DISPATCH_LAYER_EXCLUSIVE_LOCK, aio_comp,
+ io::FLUSH_SOURCE_EXCLUSIVE_LOCK_SKIP_REFRESH, {});
+ req->send();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::handle_flush_io(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ if (r < 0) {
+ lderr(cct) << "failed to flush IO: " << cpp_strerror(r) << dendl;
+ }
+
+ send_flush_notifies();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::send_flush_notifies() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ using klass = PreReleaseRequest<I>;
+ Context *ctx =
+ create_context_callback<klass, &klass::handle_flush_notifies>(this);
+ m_image_ctx.image_watcher->flush(ctx);
+}
+
+template <typename I>
+void PreReleaseRequest<I>::handle_flush_notifies(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ ceph_assert(r == 0);
+ send_close_journal();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::send_close_journal() {
+ {
+ std::unique_lock image_locker{m_image_ctx.image_lock};
+ std::swap(m_journal, m_image_ctx.journal);
+ }
+
+ if (m_journal == nullptr) {
+ send_close_object_map();
+ return;
+ }
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ using klass = PreReleaseRequest<I>;
+ Context *ctx = create_context_callback<klass, &klass::handle_close_journal>(
+ this);
+ m_journal->close(ctx);
+}
+
+template <typename I>
+void PreReleaseRequest<I>::handle_close_journal(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ if (r < 0) {
+ // error implies some journal events were not flushed -- continue
+ lderr(cct) << "failed to close journal: " << cpp_strerror(r) << dendl;
+ }
+
+ m_journal->put();
+ m_journal = nullptr;
+
+ send_close_object_map();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::send_close_object_map() {
+ {
+ std::unique_lock image_locker{m_image_ctx.image_lock};
+ std::swap(m_object_map, m_image_ctx.object_map);
+ }
+
+ if (m_object_map == nullptr) {
+ send_unlock();
+ return;
+ }
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ using klass = PreReleaseRequest<I>;
+ Context *ctx = create_context_callback<
+ klass, &klass::handle_close_object_map>(this, m_object_map);
+ m_object_map->close(ctx);
+}
+
+template <typename I>
+void PreReleaseRequest<I>::handle_close_object_map(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ if (r < 0) {
+ lderr(cct) << "failed to close object map: " << cpp_strerror(r) << dendl;
+ }
+ m_object_map->put();
+
+ send_unlock();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::send_unlock() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ finish();
+}
+
+template <typename I>
+void PreReleaseRequest<I>::finish() {
+ m_on_finish->complete(m_error_result);
+ delete this;
+}
+
+} // namespace exclusive_lock
+} // namespace librbd
+
+template class librbd::exclusive_lock::PreReleaseRequest<librbd::ImageCtx>;