--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/exclusive_lock/PostAcquireRequest.h"
+#include "cls/lock/cls_lock_client.h"
+#include "cls/lock/cls_lock_types.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "common/WorkQueue.h"
+#include "include/stringify.h"
+#include "librbd/ExclusiveLock.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+#include "librbd/ImageWatcher.h"
+#include "librbd/Journal.h"
+#include "librbd/ObjectMap.h"
+#include "librbd/Utils.h"
+#include "librbd/image/RefreshRequest.h"
+#include "librbd/journal/Policy.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::exclusive_lock::PostAcquireRequest: " \
+ << this << " " << __func__ << ": "
+
+namespace librbd {
+namespace exclusive_lock {
+
+using util::create_async_context_callback;
+using util::create_context_callback;
+using util::create_rados_callback;
+
+template <typename I>
+PostAcquireRequest<I>* PostAcquireRequest<I>::create(I &image_ctx,
+ Context *on_acquire,
+ Context *on_finish) {
+ return new PostAcquireRequest(image_ctx, on_acquire, on_finish);
+}
+
+template <typename I>
+PostAcquireRequest<I>::PostAcquireRequest(I &image_ctx, Context *on_acquire,
+ Context *on_finish)
+ : m_image_ctx(image_ctx),
+ m_on_acquire(on_acquire),
+ m_on_finish(create_async_context_callback(image_ctx, on_finish)),
+ m_object_map(nullptr), m_journal(nullptr), m_error_result(0) {
+}
+
+template <typename I>
+PostAcquireRequest<I>::~PostAcquireRequest() {
+ if (!m_prepare_lock_completed) {
+ m_image_ctx.state->handle_prepare_lock_complete();
+ }
+ delete m_on_acquire;
+}
+
+template <typename I>
+void PostAcquireRequest<I>::send() {
+ send_refresh();
+}
+
+template <typename I>
+void PostAcquireRequest<I>::send_refresh() {
+ if (!m_image_ctx.state->is_refresh_required()) {
+ send_open_object_map();
+ return;
+ }
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ using klass = PostAcquireRequest<I>;
+ Context *ctx = create_async_context_callback(
+ m_image_ctx, create_context_callback<klass, &klass::handle_refresh>(this));
+
+ // ImageState is blocked waiting for lock to complete -- safe to directly
+ // refresh
+ image::RefreshRequest<I> *req = image::RefreshRequest<I>::create(
+ m_image_ctx, true, false, ctx);
+ req->send();
+}
+
+template <typename I>
+void PostAcquireRequest<I>::handle_refresh(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ if (r == -ERESTART) {
+ // next issued IO or op will (re)-refresh the image and shut down lock
+ ldout(cct, 5) << "exclusive lock dynamically disabled" << dendl;
+ r = 0;
+ } else if (r < 0) {
+ lderr(cct) << "failed to refresh image: " << cpp_strerror(r) << dendl;
+ save_result(r);
+ revert();
+ finish();
+ return;
+ }
+
+ send_open_object_map();
+}
+
+template <typename I>
+void PostAcquireRequest<I>::send_open_journal() {
+ // alert caller that we now own the exclusive lock
+ m_on_acquire->complete(0);
+ m_on_acquire = nullptr;
+
+ bool journal_enabled;
+ {
+ RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
+ journal_enabled = (m_image_ctx.test_features(RBD_FEATURE_JOURNALING,
+ m_image_ctx.snap_lock) &&
+ !m_image_ctx.get_journal_policy()->journal_disabled());
+ }
+ if (!journal_enabled) {
+ apply();
+ finish();
+ return;
+ }
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ using klass = PostAcquireRequest<I>;
+ Context *ctx = create_context_callback<klass, &klass::handle_open_journal>(
+ this);
+ m_journal = m_image_ctx.create_journal();
+
+ // journal playback requires object map (if enabled) and itself
+ apply();
+
+ m_journal->open(ctx);
+}
+
+template <typename I>
+void PostAcquireRequest<I>::handle_open_journal(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ save_result(r);
+ if (r < 0) {
+ lderr(cct) << "failed to open journal: " << cpp_strerror(r) << dendl;
+ send_close_journal();
+ return;
+ }
+
+ send_allocate_journal_tag();
+}
+
+template <typename I>
+void PostAcquireRequest<I>::send_allocate_journal_tag() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
+ using klass = PostAcquireRequest<I>;
+ Context *ctx = create_context_callback<
+ klass, &klass::handle_allocate_journal_tag>(this);
+ m_image_ctx.get_journal_policy()->allocate_tag_on_lock(ctx);
+}
+
+template <typename I>
+void PostAcquireRequest<I>::handle_allocate_journal_tag(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ save_result(r);
+ if (r < 0) {
+ lderr(cct) << "failed to allocate journal tag: " << cpp_strerror(r)
+ << dendl;
+ send_close_journal();
+ return;
+ }
+
+ finish();
+}
+
+template <typename I>
+void PostAcquireRequest<I>::send_close_journal() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ using klass = PostAcquireRequest<I>;
+ Context *ctx = create_context_callback<klass, &klass::handle_close_journal>(
+ this);
+ m_journal->close(ctx);
+}
+
+template <typename I>
+void PostAcquireRequest<I>::handle_close_journal(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ save_result(r);
+ if (r < 0) {
+ lderr(cct) << "failed to close journal: " << cpp_strerror(r) << dendl;
+ }
+
+ send_close_object_map();
+}
+
+template <typename I>
+void PostAcquireRequest<I>::send_open_object_map() {
+ if (!m_image_ctx.test_features(RBD_FEATURE_OBJECT_MAP)) {
+ send_open_journal();
+ return;
+ }
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ using klass = PostAcquireRequest<I>;
+ Context *ctx = create_context_callback<klass, &klass::handle_open_object_map>(
+ this);
+
+ m_object_map = m_image_ctx.create_object_map(CEPH_NOSNAP);
+ m_object_map->open(ctx);
+}
+
+template <typename I>
+void PostAcquireRequest<I>::handle_open_object_map(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ if (r < 0) {
+ lderr(cct) << "failed to open object map: " << cpp_strerror(r) << dendl;
+
+ r = 0;
+ delete m_object_map;
+ m_object_map = nullptr;
+ }
+
+ send_open_journal();
+}
+
+template <typename I>
+void PostAcquireRequest<I>::send_close_object_map() {
+ if (m_object_map == nullptr) {
+ revert();
+ finish();
+ return;
+ }
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << dendl;
+
+ using klass = PostAcquireRequest<I>;
+ Context *ctx = create_context_callback<
+ klass, &klass::handle_close_object_map>(this);
+ m_object_map->close(ctx);
+}
+
+template <typename I>
+void PostAcquireRequest<I>::handle_close_object_map(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 10) << "r=" << r << dendl;
+
+ // object map should never result in an error
+ assert(r == 0);
+ revert();
+ finish();
+}
+
+template <typename I>
+void PostAcquireRequest<I>::apply() {
+ {
+ RWLock::WLocker snap_locker(m_image_ctx.snap_lock);
+ assert(m_image_ctx.object_map == nullptr);
+ m_image_ctx.object_map = m_object_map;
+
+ assert(m_image_ctx.journal == nullptr);
+ m_image_ctx.journal = m_journal;
+ }
+
+ m_prepare_lock_completed = true;
+ m_image_ctx.state->handle_prepare_lock_complete();
+}
+
+template <typename I>
+void PostAcquireRequest<I>::revert() {
+ RWLock::WLocker snap_locker(m_image_ctx.snap_lock);
+ m_image_ctx.object_map = nullptr;
+ m_image_ctx.journal = nullptr;
+
+ delete m_object_map;
+ delete m_journal;
+
+ assert(m_error_result < 0);
+}
+
+template <typename I>
+void PostAcquireRequest<I>::finish() {
+ m_on_finish->complete(m_error_result);
+ delete this;
+}
+
+} // namespace exclusive_lock
+} // namespace librbd
+
+template class librbd::exclusive_lock::PostAcquireRequest<librbd::ImageCtx>;
Code Review / stor4nfv.git / blobdiff