1 files changed, 90 insertions, 0 deletions
diff --git a/src/librbd/image/AttachParentRequest.cc b/src/librbd/image/AttachParentRequest.cc
new file mode 100644
index 000000000..d0c35b6a9
--- /dev/null
+++ b/src/librbd/image/AttachParentRequest.cc
@@ -0,0 +1,90 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/image/AttachParentRequest.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "cls/rbd/cls_rbd_client.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/Utils.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::image::AttachParentRequest: " << this \
+                           << " " << __func__ << ": "
+
+namespace librbd {
+namespace image {
+
+using util::create_rados_callback;
+
+template <typename I>
+void AttachParentRequest<I>::send() {
+  attach_parent();
+}
+
+template <typename I>
+void AttachParentRequest<I>::attach_parent() {
+  auto cct = m_image_ctx.cct;
+  ldout(cct, 5) << "parent_image_spec=" << m_parent_image_spec << dendl;
+
+  librados::ObjectWriteOperation op;
+  if (!m_legacy_parent) {
+    librbd::cls_client::parent_attach(&op, m_parent_image_spec,
+                                      m_parent_overlap, m_reattach);
+  } else {
+    librbd::cls_client::set_parent(&op, m_parent_image_spec, m_parent_overlap);
+  }
+
+  auto aio_comp = create_rados_callback<
+    AttachParentRequest<I>,
+    &AttachParentRequest<I>::handle_attach_parent>(this);
+  int r = m_image_ctx.md_ctx.aio_operate(m_image_ctx.header_oid, aio_comp, &op);
+  ceph_assert(r == 0);
+  aio_comp->release();
+}
+
+template <typename I>
+void AttachParentRequest<I>::handle_attach_parent(int r) {
+  auto cct = m_image_ctx.cct;
+  ldout(cct, 5) << dendl;
+
+  if (!m_legacy_parent && r == -EOPNOTSUPP && !m_reattach) {
+    if (m_parent_image_spec.pool_namespace ==
+          m_image_ctx.md_ctx.get_namespace()) {
+      m_parent_image_spec.pool_namespace = "";
+    }
+    if (m_parent_image_spec.pool_namespace.empty()) {
+      ldout(cct, 10) << "retrying using legacy parent method" << dendl;
+      m_legacy_parent = true;
+      attach_parent();
+      return;
+    }
+
+    // namespaces require newer OSDs
+    r = -EXDEV;
+  }
+
+  if (r < 0) {
+    lderr(cct) << "attach parent encountered an error: " << cpp_strerror(r)
+               << dendl;
+    finish(r);
+    return;
+  }
+
+  finish(0);
+}
+
+template <typename I>
+void AttachParentRequest<I>::finish(int r) {
+  auto cct = m_image_ctx.cct;
+  ldout(cct, 5) << "r=" << r << dendl;
+
+  m_on_finish->complete(r);
+  delete this;
+}
+
+} // namespace image
+} // namespace librbd
+
+template class librbd::image::AttachParentRequest<librbd::ImageCtx>;