initial code repo

[stor4nfv.git] / src / ceph / src / tools / rbd_mirror / image_replayer / PrepareLocalImageRequest.cc

diff --git a/src/ceph/src/tools/rbd_mirror/image_replayer/PrepareLocalImageRequest.cc b/src/ceph/src/tools/rbd_mirror/image_replayer/PrepareLocalImageRequest.cc
new file mode 100644 (file)
index 0000000..4009dc1
--- /dev/null
+++ b/src/ceph/src/tools/rbd_mirror/image_replayer/PrepareLocalImageRequest.cc
@@ -0,0 +1,143 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "tools/rbd_mirror/image_replayer/PrepareLocalImageRequest.h"
+#include "include/rados/librados.hpp"
+#include "cls/rbd/cls_rbd_client.h"
+#include "common/errno.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/Journal.h"
+#include "librbd/Utils.h"
+#include "tools/rbd_mirror/Threads.h"
+#include "tools/rbd_mirror/image_replayer/GetMirrorImageIdRequest.h"
+#include <type_traits>
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rbd_mirror
+#undef dout_prefix
+#define dout_prefix *_dout << "rbd::mirror::image_replayer::" \
+                           << "PrepareLocalImageRequest: " << this << " " \
+                           << __func__ << ": "
+
+namespace rbd {
+namespace mirror {
+namespace image_replayer {
+
+using librbd::util::create_context_callback;
+using librbd::util::create_rados_callback;
+
+template <typename I>
+void PrepareLocalImageRequest<I>::send() {
+  dout(20) << dendl;
+  get_local_image_id();
+}
+
+template <typename I>
+void PrepareLocalImageRequest<I>::get_local_image_id() {
+  dout(20) << dendl;
+
+  Context *ctx = create_context_callback<
+    PrepareLocalImageRequest<I>,
+    &PrepareLocalImageRequest<I>::handle_get_local_image_id>(this);
+  auto req = GetMirrorImageIdRequest<I>::create(m_io_ctx, m_global_image_id,
+                                                m_local_image_id, ctx);
+  req->send();
+}
+
+template <typename I>
+void PrepareLocalImageRequest<I>::handle_get_local_image_id(int r) {
+  dout(20) << "r=" << r << ", "
+           << "local_image_id=" << *m_local_image_id << dendl;
+
+  if (r < 0) {
+    finish(r);
+    return;
+  }
+
+  get_mirror_state();
+}
+
+template <typename I>
+void PrepareLocalImageRequest<I>::get_mirror_state() {
+  dout(20) << dendl;
+
+  librados::ObjectReadOperation op;
+  librbd::cls_client::mirror_image_get_start(&op, *m_local_image_id);
+
+  m_out_bl.clear();
+  librados::AioCompletion *aio_comp = create_rados_callback<
+    PrepareLocalImageRequest<I>,
+    &PrepareLocalImageRequest<I>::handle_get_mirror_state>(this);
+  int r = m_io_ctx.aio_operate(RBD_MIRRORING, aio_comp, &op, &m_out_bl);
+  assert(r == 0);
+  aio_comp->release();
+}
+
+template <typename I>
+void PrepareLocalImageRequest<I>::handle_get_mirror_state(int r) {
+  dout(20) << ": r=" << r << dendl;
+
+  cls::rbd::MirrorImage mirror_image;
+  if (r == 0) {
+    bufferlist::iterator iter = m_out_bl.begin();
+    r = librbd::cls_client::mirror_image_get_finish(&iter, &mirror_image);
+  }
+
+  if (r < 0) {
+    derr << "failed to retrieve image mirror state: " << cpp_strerror(r)
+         << dendl;
+    finish(r);
+    return;
+  }
+
+  // TODO save current mirror state to determine if we should
+  // delete a partially formed image
+  // (e.g. MIRROR_IMAGE_STATE_CREATING/DELETING)
+
+  get_tag_owner();
+}
+
+template <typename I>
+void PrepareLocalImageRequest<I>::get_tag_owner() {
+  // deduce the class type for the journal to support unit tests
+  using Journal = typename std::decay<
+    typename std::remove_pointer<decltype(std::declval<I>().journal)>
+    ::type>::type;
+
+  dout(20) << dendl;
+
+  Context *ctx = create_context_callback<
+    PrepareLocalImageRequest<I>,
+    &PrepareLocalImageRequest<I>::handle_get_tag_owner>(this);
+  Journal::get_tag_owner(m_io_ctx, *m_local_image_id, m_tag_owner,
+                         m_work_queue, ctx);
+}
+
+template <typename I>
+void PrepareLocalImageRequest<I>::handle_get_tag_owner(int r) {
+  dout(20) << "r=" << r << ", "
+           << "tag_owner=" << *m_tag_owner << dendl;
+
+  if (r < 0) {
+    derr << "failed to retrieve journal tag owner: " << cpp_strerror(r)
+         << dendl;
+    finish(r);
+    return;
+  }
+
+  finish(0);
+}
+
+template <typename I>
+void PrepareLocalImageRequest<I>::finish(int r) {
+  dout(20) << "r=" << r << dendl;
+
+  m_on_finish->complete(r);
+  delete this;
+}
+
+} // namespace image_replayer
+} // namespace mirror
+} // namespace rbd
+
+template class rbd::mirror::image_replayer::PrepareLocalImageRequest<librbd::ImageCtx>;