1 files changed, 234 insertions, 0 deletions
diff --git a/src/librbd/journal/CreateRequest.cc b/src/librbd/journal/CreateRequest.cc
new file mode 100644
index 000000000..4f7a0f5be
--- /dev/null
+++ b/src/librbd/journal/CreateRequest.cc
@@ -0,0 +1,234 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "common/dout.h"
+#include "common/errno.h"
+#include "include/ceph_assert.h"
+#include "librbd/Utils.h"
+#include "common/Timer.h"
+#include "journal/Settings.h"
+#include "librbd/journal/CreateRequest.h"
+#include "librbd/journal/RemoveRequest.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::Journal::CreateRequest: "
+
+namespace librbd {
+
+using util::create_context_callback;
+
+namespace journal {
+
+template<typename I>
+CreateRequest<I>::CreateRequest(IoCtx &ioctx, const std::string &imageid,
+                                uint8_t order, uint8_t splay_width,
+                                const std::string &object_pool,
+                                uint64_t tag_class, TagData &tag_data,
+                                const std::string &client_id,
+                                ContextWQ *op_work_queue,
+                                Context *on_finish)
+  : m_ioctx(ioctx), m_image_id(imageid), m_order(order),
+    m_splay_width(splay_width), m_object_pool(object_pool),
+    m_tag_class(tag_class), m_tag_data(tag_data), m_image_client_id(client_id),
+    m_op_work_queue(op_work_queue), m_on_finish(on_finish) {
+  m_cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
+}
+
+template<typename I>
+void CreateRequest<I>::send() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  if (m_order > 64 || m_order < 12) {
+    lderr(m_cct) << "order must be in the range [12, 64]" << dendl;
+    complete(-EDOM);
+    return;
+  }
+  if (m_splay_width == 0) {
+    complete(-EINVAL);
+    return;
+  }
+
+  get_pool_id();
+}
+
+template<typename I>
+void CreateRequest<I>::get_pool_id() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  if (m_object_pool.empty()) {
+    create_journal();
+    return;
+  }
+
+  librados::Rados rados(m_ioctx);
+  IoCtx data_ioctx;
+  int r = rados.ioctx_create(m_object_pool.c_str(), data_ioctx);
+  if (r != 0) {
+    lderr(m_cct) << "failed to create journal: "
+                 << "error opening journal object pool '" << m_object_pool
+                 << "': " << cpp_strerror(r) << dendl;
+    complete(r);
+    return;
+  }
+  data_ioctx.set_namespace(m_ioctx.get_namespace());
+
+  m_pool_id = data_ioctx.get_id();
+  create_journal();
+}
+
+template<typename I>
+void CreateRequest<I>::create_journal() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  ImageCtx::get_timer_instance(m_cct, &m_timer, &m_timer_lock);
+  m_journaler = new Journaler(m_op_work_queue, m_timer, m_timer_lock, m_ioctx,
+                              m_image_id, m_image_client_id, {}, nullptr);
+
+  using klass = CreateRequest<I>;
+  Context *ctx = create_context_callback<klass, &klass::handle_create_journal>(this);
+
+  m_journaler->create(m_order, m_splay_width, m_pool_id, ctx);
+}
+
+template<typename I>
+Context *CreateRequest<I>::handle_create_journal(int *result) {
+  ldout(m_cct, 20) << __func__ << ": r=" << *result << dendl;
+
+  if (*result < 0) {
+    lderr(m_cct) << "failed to create journal: " << cpp_strerror(*result) << dendl;
+    shut_down_journaler(*result);
+    return nullptr;
+  }
+
+  allocate_journal_tag();
+  return nullptr;
+}
+
+template<typename I>
+void CreateRequest<I>::allocate_journal_tag() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  using klass = CreateRequest<I>;
+  Context *ctx = create_context_callback<klass, &klass::handle_journal_tag>(this);
+
+  encode(m_tag_data, m_bl);
+  m_journaler->allocate_tag(m_tag_class, m_bl, &m_tag, ctx);
+}
+
+template<typename I>
+Context *CreateRequest<I>::handle_journal_tag(int *result) {
+  ldout(m_cct, 20) << __func__ << ": r=" << *result << dendl;
+
+  if (*result < 0) {
+    lderr(m_cct) << "failed to allocate tag: " << cpp_strerror(*result) << dendl;
+    shut_down_journaler(*result);
+    return nullptr;
+  }
+
+  register_client();
+  return nullptr;
+}
+
+template<typename I>
+void CreateRequest<I>::register_client() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  m_bl.clear();
+  encode(ClientData{ImageClientMeta{m_tag.tag_class}}, m_bl);
+
+  using klass = CreateRequest<I>;
+  Context *ctx = create_context_callback<klass, &klass::handle_register_client>(this);
+
+  m_journaler->register_client(m_bl, ctx);
+}
+
+template<typename I>
+Context *CreateRequest<I>::handle_register_client(int *result) {
+  ldout(m_cct, 20) << __func__ << ": r=" << *result << dendl;
+
+  if (*result < 0) {
+    lderr(m_cct) << "failed to register client: " << cpp_strerror(*result) << dendl;
+  }
+
+  shut_down_journaler(*result);
+  return nullptr;
+}
+
+template<typename I>
+void CreateRequest<I>::shut_down_journaler(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  m_r_saved = r;
+
+  using klass = CreateRequest<I>;
+  Context *ctx = create_context_callback<klass, &klass::handle_journaler_shutdown>(this);
+
+  m_journaler->shut_down(ctx);
+}
+
+template<typename I>
+Context *CreateRequest<I>::handle_journaler_shutdown(int *result) {
+  ldout(m_cct, 20) << __func__ << ": r=" << *result << dendl;
+
+  if (*result < 0) {
+    lderr(m_cct) << "failed to shut down journaler: " << cpp_strerror(*result) << dendl;
+  }
+
+  delete m_journaler;
+
+  if (!m_r_saved) {
+    complete(0);
+    return nullptr;
+  }
+
+  // there was an error during journal creation, so we rollback
+  // what ever was done. the easiest way to do this is to invoke
+  // journal remove state machine, although it's not the most
+  // cleanest approach when it comes to redundancy, but that's
+  // ok during the failure path.
+  remove_journal();
+  return nullptr;
+}
+
+template<typename I>
+void CreateRequest<I>::remove_journal() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  using klass = CreateRequest<I>;
+  Context *ctx = create_context_callback<klass, &klass::handle_remove_journal>(this);
+
+  RemoveRequest<I> *req = RemoveRequest<I>::create(
+    m_ioctx, m_image_id, m_image_client_id, m_op_work_queue, ctx);
+  req->send();
+}
+
+template<typename I>
+Context *CreateRequest<I>::handle_remove_journal(int *result) {
+  ldout(m_cct, 20) << __func__ << ": r=" << *result << dendl;
+
+  if (*result < 0) {
+    lderr(m_cct) << "error cleaning up journal after creation failed: "
+                 << cpp_strerror(*result) << dendl;
+  }
+
+  complete(m_r_saved);
+  return nullptr;
+}
+
+template<typename I>
+void CreateRequest<I>::complete(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  if (r == 0) {
+    ldout(m_cct, 20) << "done." << dendl;
+  }
+
+  m_on_finish->complete(r);
+  delete this;
+}
+
+} // namespace journal
+} // namespace librbd
+
+template class librbd::journal::CreateRequest<librbd::ImageCtx>;