initial code repo

[stor4nfv.git] / src / ceph / src / tools / rbd_mirror / image_sync / SyncPointCreateRequest.cc

diff --git a/src/ceph/src/tools/rbd_mirror/image_sync/SyncPointCreateRequest.cc b/src/ceph/src/tools/rbd_mirror/image_sync/SyncPointCreateRequest.cc
new file mode 100644 (file)
index 0000000..5323d7d
--- /dev/null
+++ b/src/ceph/src/tools/rbd_mirror/image_sync/SyncPointCreateRequest.cc
@@ -0,0 +1,181 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "SyncPointCreateRequest.h"
+#include "include/uuid.h"
+#include "common/errno.h"
+#include "journal/Journaler.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+#include "librbd/Operations.h"
+#include "librbd/Utils.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rbd_mirror
+#undef dout_prefix
+#define dout_prefix *_dout << "rbd::mirror::image_sync::SyncPointCreateRequest: " \
+                           << this << " " << __func__
+
+namespace rbd {
+namespace mirror {
+namespace image_sync {
+
+namespace {
+
+static const std::string SNAP_NAME_PREFIX(".rbd-mirror");
+
+} // anonymous namespace
+
+using librbd::util::create_context_callback;
+
+template <typename I>
+SyncPointCreateRequest<I>::SyncPointCreateRequest(I *remote_image_ctx,
+                                                  const std::string &mirror_uuid,
+                                                  Journaler *journaler,
+                                                  MirrorPeerClientMeta *client_meta,
+                                                  Context *on_finish)
+  : m_remote_image_ctx(remote_image_ctx), m_mirror_uuid(mirror_uuid),
+    m_journaler(journaler), m_client_meta(client_meta), m_on_finish(on_finish),
+    m_client_meta_copy(*client_meta) {
+  assert(m_client_meta->sync_points.size() < 2);
+
+  // initialize the updated client meta with the new sync point
+  m_client_meta_copy.sync_points.emplace_back();
+  if (m_client_meta_copy.sync_points.size() > 1) {
+    m_client_meta_copy.sync_points.back().from_snap_name =
+      m_client_meta_copy.sync_points.front().snap_name;
+  }
+}
+
+template <typename I>
+void SyncPointCreateRequest<I>::send() {
+  send_update_client();
+}
+
+template <typename I>
+void SyncPointCreateRequest<I>::send_update_client() {
+  uuid_d uuid_gen;
+  uuid_gen.generate_random();
+
+  MirrorPeerSyncPoint &sync_point = m_client_meta_copy.sync_points.back();
+  sync_point.snap_name = SNAP_NAME_PREFIX + "." + m_mirror_uuid + "." +
+                         uuid_gen.to_string();
+
+  dout(20) << ": sync_point=" << sync_point << dendl;
+
+  bufferlist client_data_bl;
+  librbd::journal::ClientData client_data(m_client_meta_copy);
+  ::encode(client_data, client_data_bl);
+
+  Context *ctx = create_context_callback<
+    SyncPointCreateRequest<I>, &SyncPointCreateRequest<I>::handle_update_client>(
+      this);
+  m_journaler->update_client(client_data_bl, ctx);
+}
+
+template <typename I>
+void SyncPointCreateRequest<I>::handle_update_client(int r) {
+  dout(20) << ": r=" << r << dendl;
+
+  if (r < 0) {
+    derr << ": failed to update client data: " << cpp_strerror(r)
+         << dendl;
+    finish(r);
+    return;
+  }
+
+  // update provided meta structure to reflect reality
+  *m_client_meta = m_client_meta_copy;
+
+  send_refresh_image();
+}
+
+template <typename I>
+void SyncPointCreateRequest<I>::send_refresh_image() {
+  dout(20) << dendl;
+
+  Context *ctx = create_context_callback<
+    SyncPointCreateRequest<I>, &SyncPointCreateRequest<I>::handle_refresh_image>(
+      this);
+  m_remote_image_ctx->state->refresh(ctx);
+}
+
+template <typename I>
+void SyncPointCreateRequest<I>::handle_refresh_image(int r) {
+  dout(20) << ": r=" << r << dendl;
+
+  if (r < 0) {
+    derr << ": remote image refresh failed: " << cpp_strerror(r) << dendl;
+    finish(r);
+    return;
+  }
+
+  send_create_snap();
+}
+
+template <typename I>
+void SyncPointCreateRequest<I>::send_create_snap() {
+  dout(20) << dendl;
+
+  MirrorPeerSyncPoint &sync_point = m_client_meta_copy.sync_points.back();
+
+  Context *ctx = create_context_callback<
+    SyncPointCreateRequest<I>, &SyncPointCreateRequest<I>::handle_create_snap>(
+      this);
+  m_remote_image_ctx->operations->snap_create(
+    cls::rbd::UserSnapshotNamespace(), sync_point.snap_name.c_str(), ctx);
+}
+
+template <typename I>
+void SyncPointCreateRequest<I>::handle_create_snap(int r) {
+  dout(20) << ": r=" << r << dendl;
+
+  if (r == -EEXIST) {
+    send_update_client();
+    return;
+  } else if (r < 0) {
+    derr << ": failed to create snapshot: " << cpp_strerror(r) << dendl;
+    finish(r);
+    return;
+  }
+
+  send_final_refresh_image();
+}
+
+template <typename I>
+void SyncPointCreateRequest<I>::send_final_refresh_image() {
+  dout(20) << dendl;
+
+  Context *ctx = create_context_callback<
+    SyncPointCreateRequest<I>,
+    &SyncPointCreateRequest<I>::handle_final_refresh_image>(this);
+  m_remote_image_ctx->state->refresh(ctx);
+}
+
+template <typename I>
+void SyncPointCreateRequest<I>::handle_final_refresh_image(int r) {
+  dout(20) << ": r=" << r << dendl;
+
+  if (r < 0) {
+    derr << ": failed to refresh image for snapshot: " << cpp_strerror(r)
+         << dendl;
+    finish(r);
+    return;
+  }
+
+  finish(0);
+}
+
+template <typename I>
+void SyncPointCreateRequest<I>::finish(int r) {
+  dout(20) << ": r=" << r << dendl;
+
+  m_on_finish->complete(r);
+  delete this;
+}
+
+} // namespace image_sync
+} // namespace mirror
+} // namespace rbd
+
+template class rbd::mirror::image_sync::SyncPointCreateRequest<librbd::ImageCtx>;