X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Flibrbd%2Fexclusive_lock%2FPostAcquireRequest.cc;fp=src%2Fceph%2Fsrc%2Flibrbd%2Fexclusive_lock%2FPostAcquireRequest.cc;h=870cf49b3d2597d5424c657176f26a0a442e1471;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/librbd/exclusive_lock/PostAcquireRequest.cc b/src/ceph/src/librbd/exclusive_lock/PostAcquireRequest.cc
new file mode 100644
index 0000000..870cf49
--- /dev/null
+++ b/src/ceph/src/librbd/exclusive_lock/PostAcquireRequest.cc
@@ -0,0 +1,301 @@
+// -*- 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>;