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-rw-r--r--src/librbd/image/AttachChildRequest.cc261
1 files changed, 261 insertions, 0 deletions
diff --git a/src/librbd/image/AttachChildRequest.cc b/src/librbd/image/AttachChildRequest.cc
new file mode 100644
index 000000000..2f74191ed
--- /dev/null
+++ b/src/librbd/image/AttachChildRequest.cc
@@ -0,0 +1,261 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/image/AttachChildRequest.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "cls/rbd/cls_rbd_client.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/Utils.h"
+#include "librbd/image/RefreshRequest.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::image::AttachChildRequest: " << this \
+ << " " << __func__ << ": "
+
+namespace librbd {
+namespace image {
+
+using util::create_context_callback;
+using util::create_rados_callback;
+
+template <typename I>
+AttachChildRequest<I>::AttachChildRequest(
+ I *image_ctx, I *parent_image_ctx, const librados::snap_t &parent_snap_id,
+ I *old_parent_image_ctx, const librados::snap_t &old_parent_snap_id,
+ uint32_t clone_format, Context* on_finish)
+ : m_image_ctx(image_ctx), m_parent_image_ctx(parent_image_ctx),
+ m_parent_snap_id(parent_snap_id),
+ m_old_parent_image_ctx(old_parent_image_ctx),
+ m_old_parent_snap_id(old_parent_snap_id), m_clone_format(clone_format),
+ m_on_finish(on_finish), m_cct(m_image_ctx->cct) {
+}
+
+template <typename I>
+void AttachChildRequest<I>::send() {
+ if (m_clone_format == 1) {
+ v1_add_child();
+ } else {
+ v2_set_op_feature();
+ }
+}
+
+template <typename I>
+void AttachChildRequest<I>::v1_add_child() {
+ ldout(m_cct, 15) << dendl;
+
+ librados::ObjectWriteOperation op;
+ cls_client::add_child(&op, {m_parent_image_ctx->md_ctx.get_id(), "",
+ m_parent_image_ctx->id,
+ m_parent_snap_id}, m_image_ctx->id);
+
+ using klass = AttachChildRequest<I>;
+ librados::AioCompletion *comp =
+ create_rados_callback<klass, &klass::handle_v1_add_child>(this);
+ int r = m_image_ctx->md_ctx.aio_operate(RBD_CHILDREN, comp, &op);
+ ceph_assert(r == 0);
+ comp->release();
+}
+
+template <typename I>
+void AttachChildRequest<I>::handle_v1_add_child(int r) {
+ ldout(m_cct, 15) << "r=" << r << dendl;
+
+ if (r < 0) {
+ if (r == -EEXIST && m_old_parent_image_ctx != nullptr) {
+ ldout(m_cct, 5) << "child already exists" << dendl;
+ } else {
+ lderr(m_cct) << "couldn't add child: " << cpp_strerror(r) << dendl;
+ finish(r);
+ return;
+ }
+ }
+
+ v1_refresh();
+}
+
+template <typename I>
+void AttachChildRequest<I>::v1_refresh() {
+ ldout(m_cct, 15) << dendl;
+
+ using klass = AttachChildRequest<I>;
+ RefreshRequest<I> *req = RefreshRequest<I>::create(
+ *m_parent_image_ctx, false, false,
+ create_context_callback<klass, &klass::handle_v1_refresh>(this));
+ req->send();
+}
+
+template <typename I>
+void AttachChildRequest<I>::handle_v1_refresh(int r) {
+ ldout(m_cct, 15) << "r=" << r << dendl;
+
+ bool snap_protected = false;
+ if (r == 0) {
+ std::shared_lock image_locker{m_parent_image_ctx->image_lock};
+ r = m_parent_image_ctx->is_snap_protected(m_parent_snap_id,
+ &snap_protected);
+ }
+
+ if (r < 0 || !snap_protected) {
+ lderr(m_cct) << "validate protected failed" << dendl;
+ finish(-EINVAL);
+ return;
+ }
+
+ v1_remove_child_from_old_parent();
+}
+
+template <typename I>
+void AttachChildRequest<I>::v1_remove_child_from_old_parent() {
+ if (m_old_parent_image_ctx == nullptr) {
+ finish(0);
+ return;
+ }
+
+ ldout(m_cct, 15) << dendl;
+
+ librados::ObjectWriteOperation op;
+ cls_client::remove_child(&op, {m_old_parent_image_ctx->md_ctx.get_id(),
+ m_old_parent_image_ctx->md_ctx.get_namespace(),
+ m_old_parent_image_ctx->id,
+ m_old_parent_snap_id}, m_image_ctx->id);
+
+ using klass = AttachChildRequest<I>;
+ librados::AioCompletion *comp = create_rados_callback<
+ klass, &klass::handle_v1_remove_child_from_old_parent>(this);
+ int r = m_image_ctx->md_ctx.aio_operate(RBD_CHILDREN, comp, &op);
+ ceph_assert(r == 0);
+ comp->release();
+}
+
+template <typename I>
+void AttachChildRequest<I>::handle_v1_remove_child_from_old_parent(int r) {
+ ldout(m_cct, 15) << "r=" << r << dendl;
+
+ if (r < 0 && r != -ENOENT) {
+ lderr(m_cct) << "couldn't remove child: " << cpp_strerror(r) << dendl;
+ finish(r);
+ return;
+ }
+
+ finish(0);
+}
+
+template <typename I>
+void AttachChildRequest<I>::v2_set_op_feature() {
+ ldout(m_cct, 15) << dendl;
+
+ librados::ObjectWriteOperation op;
+ cls_client::op_features_set(&op, RBD_OPERATION_FEATURE_CLONE_CHILD,
+ RBD_OPERATION_FEATURE_CLONE_CHILD);
+
+ using klass = AttachChildRequest<I>;
+ auto aio_comp = create_rados_callback<
+ klass, &klass::handle_v2_set_op_feature>(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 AttachChildRequest<I>::handle_v2_set_op_feature(int r) {
+ ldout(m_cct, 15) << "r=" << r << dendl;
+
+ if (r < 0) {
+ lderr(m_cct) << "failed to enable clone v2: " << cpp_strerror(r) << dendl;
+ finish(r);
+ return;
+ }
+
+ v2_child_attach();
+}
+
+template <typename I>
+void AttachChildRequest<I>::v2_child_attach() {
+ ldout(m_cct, 15) << dendl;
+
+ librados::ObjectWriteOperation op;
+ cls_client::child_attach(&op, m_parent_snap_id,
+ {m_image_ctx->md_ctx.get_id(),
+ m_image_ctx->md_ctx.get_namespace(),
+ m_image_ctx->id});
+
+ using klass = AttachChildRequest<I>;
+ auto aio_comp = create_rados_callback<
+ klass, &klass::handle_v2_child_attach>(this);
+ int r = m_parent_image_ctx->md_ctx.aio_operate(m_parent_image_ctx->header_oid,
+ aio_comp, &op);
+ ceph_assert(r == 0);
+ aio_comp->release();
+}
+
+template <typename I>
+void AttachChildRequest<I>::handle_v2_child_attach(int r) {
+ ldout(m_cct, 15) << "r=" << r << dendl;
+
+ if (r < 0) {
+ if (r == -EEXIST && m_old_parent_image_ctx != nullptr) {
+ ldout(m_cct, 5) << "child already exists" << dendl;
+ } else {
+ lderr(m_cct) << "failed to attach child image: " << cpp_strerror(r)
+ << dendl;
+ finish(r);
+ return;
+ }
+ }
+
+ v2_child_detach_from_old_parent();
+}
+
+template <typename I>
+void AttachChildRequest<I>::v2_child_detach_from_old_parent() {
+ if (m_old_parent_image_ctx == nullptr) {
+ finish(0);
+ return;
+ }
+
+ ldout(m_cct, 15) << dendl;
+
+ librados::ObjectWriteOperation op;
+ cls_client::child_detach(&op, m_old_parent_snap_id,
+ {m_image_ctx->md_ctx.get_id(),
+ m_image_ctx->md_ctx.get_namespace(),
+ m_image_ctx->id});
+
+ using klass = AttachChildRequest<I>;
+ auto aio_comp = create_rados_callback<
+ klass, &klass::handle_v2_child_detach_from_old_parent>(this);
+ int r = m_old_parent_image_ctx->md_ctx.aio_operate(
+ m_old_parent_image_ctx->header_oid, aio_comp, &op);
+ ceph_assert(r == 0);
+ aio_comp->release();
+}
+
+template <typename I>
+void AttachChildRequest<I>::handle_v2_child_detach_from_old_parent(int r) {
+ ldout(m_cct, 15) << "r=" << r << dendl;
+
+ if (r < 0 && r != -ENOENT) {
+ lderr(m_cct) << "failed to detach child image: " << cpp_strerror(r)
+ << dendl;
+ finish(r);
+ return;
+ }
+
+ finish(0);
+}
+
+template <typename I>
+void AttachChildRequest<I>::finish(int r) {
+ ldout(m_cct, 5) << "r=" << r << dendl;
+
+ m_on_finish->complete(r);
+ delete this;
+}
+
+} // namespace image
+} // namespace librbd
+
+template class librbd::image::AttachChildRequest<librbd::ImageCtx>;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 14:37:23 +0000