--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/operation/RenameRequest.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "include/rados/librados.hpp"
+#include "librbd/ImageCtx.h"
+#include "librbd/internal.h"
+#include "librbd/Utils.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::operation::RenameRequest: "
+
+namespace librbd {
+namespace operation {
+
+namespace {
+
+template <typename I>
+std::ostream& operator<<(std::ostream& os,
+ const typename RenameRequest<I>::State& state) {
+ switch(state) {
+ case RenameRequest<I>::STATE_READ_SOURCE_HEADER:
+ os << "READ_SOURCE_HEADER";
+ break;
+ case RenameRequest<I>::STATE_WRITE_DEST_HEADER:
+ os << "WRITE_DEST_HEADER";
+ break;
+ case RenameRequest<I>::STATE_UPDATE_DIRECTORY:
+ os << "UPDATE_DIRECTORY";
+ break;
+ case RenameRequest<I>::STATE_REMOVE_SOURCE_HEADER:
+ os << "REMOVE_SOURCE_HEADER";
+ break;
+ default:
+ os << "UNKNOWN (" << static_cast<uint32_t>(state) << ")";
+ break;
+ }
+ return os;
+}
+
+} // anonymous namespace
+
+template <typename I>
+RenameRequest<I>::RenameRequest(I &image_ctx, Context *on_finish,
+ const std::string &dest_name)
+ : Request<I>(image_ctx, on_finish), m_dest_name(dest_name),
+ m_source_oid(image_ctx.old_format ? util::old_header_name(image_ctx.name) :
+ util::id_obj_name(image_ctx.name)),
+ m_dest_oid(image_ctx.old_format ? util::old_header_name(dest_name) :
+ util::id_obj_name(dest_name)) {
+}
+
+template <typename I>
+void RenameRequest<I>::send_op() {
+ send_read_source_header();
+}
+
+template <typename I>
+bool RenameRequest<I>::should_complete(int r) {
+ I &image_ctx = this->m_image_ctx;
+ CephContext *cct = image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << ": state=" << m_state << ", "
+ << "r=" << r << dendl;
+ r = filter_state_return_code(r);
+ if (r < 0) {
+ if (r == -EEXIST) {
+ ldout(cct, 1) << "image already exists" << dendl;
+ } else {
+ lderr(cct) << "encountered error: " << cpp_strerror(r) << dendl;
+ }
+ return true;
+ }
+
+ if (m_state == STATE_REMOVE_SOURCE_HEADER) {
+ apply();
+ return true;
+ }
+
+ RWLock::RLocker owner_lock(image_ctx.owner_lock);
+ switch (m_state) {
+ case STATE_READ_SOURCE_HEADER:
+ send_write_destination_header();
+ break;
+ case STATE_WRITE_DEST_HEADER:
+ send_update_directory();
+ break;
+ case STATE_UPDATE_DIRECTORY:
+ send_remove_source_header();
+ break;
+ default:
+ assert(false);
+ break;
+ }
+ return false;
+}
+
+template <typename I>
+int RenameRequest<I>::filter_state_return_code(int r) {
+ I &image_ctx = this->m_image_ctx;
+ CephContext *cct = image_ctx.cct;
+
+ if (m_state == STATE_REMOVE_SOURCE_HEADER && r < 0) {
+ if (r != -ENOENT) {
+ lderr(cct) << "warning: couldn't remove old source object ("
+ << m_source_oid << ")" << dendl;
+ }
+ return 0;
+ }
+ return r;
+}
+
+template <typename I>
+void RenameRequest<I>::send_read_source_header() {
+ I &image_ctx = this->m_image_ctx;
+ CephContext *cct = image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << dendl;
+ m_state = STATE_READ_SOURCE_HEADER;
+
+ librados::ObjectReadOperation op;
+ op.read(0, 0, NULL, NULL);
+
+ // TODO: old code read omap values but there are no omap values on the
+ // old format header nor the new format id object
+ librados::AioCompletion *rados_completion = this->create_callback_completion();
+ int r = image_ctx.md_ctx.aio_operate(m_source_oid, rados_completion, &op,
+ &m_header_bl);
+ assert(r == 0);
+ rados_completion->release();
+}
+
+template <typename I>
+void RenameRequest<I>::send_write_destination_header() {
+ I &image_ctx = this->m_image_ctx;
+ CephContext *cct = image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << dendl;
+ m_state = STATE_WRITE_DEST_HEADER;
+
+ librados::ObjectWriteOperation op;
+ op.create(true);
+ op.write_full(m_header_bl);
+
+ librados::AioCompletion *rados_completion = this->create_callback_completion();
+ int r = image_ctx.md_ctx.aio_operate(m_dest_oid, rados_completion, &op);
+ assert(r == 0);
+ rados_completion->release();
+}
+
+template <typename I>
+void RenameRequest<I>::send_update_directory() {
+ I &image_ctx = this->m_image_ctx;
+ CephContext *cct = image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << dendl;
+ m_state = STATE_UPDATE_DIRECTORY;
+
+ librados::ObjectWriteOperation op;
+ if (image_ctx.old_format) {
+ bufferlist cmd_bl;
+ bufferlist empty_bl;
+ ::encode(static_cast<__u8>(CEPH_OSD_TMAP_SET), cmd_bl);
+ ::encode(m_dest_name, cmd_bl);
+ ::encode(empty_bl, cmd_bl);
+ ::encode(static_cast<__u8>(CEPH_OSD_TMAP_RM), cmd_bl);
+ ::encode(image_ctx.name, cmd_bl);
+ op.tmap_update(cmd_bl);
+ } else {
+ cls_client::dir_rename_image(&op, image_ctx.name, m_dest_name,
+ image_ctx.id);
+ }
+
+ librados::AioCompletion *rados_completion = this->create_callback_completion();
+ int r = image_ctx.md_ctx.aio_operate(RBD_DIRECTORY, rados_completion, &op);
+ assert(r == 0);
+ rados_completion->release();
+}
+
+template <typename I>
+void RenameRequest<I>::send_remove_source_header() {
+ I &image_ctx = this->m_image_ctx;
+ CephContext *cct = image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << dendl;
+ m_state = STATE_REMOVE_SOURCE_HEADER;
+
+ librados::ObjectWriteOperation op;
+ op.remove();
+
+ librados::AioCompletion *rados_completion = this->create_callback_completion();
+ int r = image_ctx.md_ctx.aio_operate(m_source_oid, rados_completion, &op);
+ assert(r == 0);
+ rados_completion->release();
+}
+
+template <typename I>
+void RenameRequest<I>::apply() {
+ I &image_ctx = this->m_image_ctx;
+ image_ctx.set_image_name(m_dest_name);
+}
+
+} // namespace operation
+} // namespace librbd
+
+template class librbd::operation::RenameRequest<librbd::ImageCtx>;
Code Review / stor4nfv.git / blobdiff