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Diffstat (limited to '')
| -rw-r--r-- | src/librbd/operation/RenameRequest.cc | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/src/librbd/operation/RenameRequest.cc b/src/librbd/operation/RenameRequest.cc new file mode 100644 index 000000000..15bcd819c --- /dev/null +++ b/src/librbd/operation/RenameRequest.cc @@ -0,0 +1,257 @@ +// -*- 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_DIRECTORY: + os << "READ_DIRECTORY"; + break; + 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() { + I &image_ctx = this->m_image_ctx; + if (image_ctx.old_format) { + send_read_source_header(); + return; + } + send_read_directory(); +} + +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_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_READ_DIRECTORY) { + std::string name; + auto it = m_source_name_bl.cbegin(); + r = cls_client::dir_get_name_finish(&it, &name); + if (r < 0) { + lderr(cct) << "could not read directory: " << cpp_strerror(r) << dendl; + return true; + } + bool update = false; + { + std::shared_lock image_locker{image_ctx.image_lock}; + update = image_ctx.name != name; + } + if (update) { + image_ctx.set_image_name(name); + m_source_oid = util::id_obj_name(name); + } + } else if (m_state == STATE_UPDATE_DIRECTORY) { + // update in-memory name before removing source header + apply(); + } else if (m_state == STATE_REMOVE_SOURCE_HEADER) { + return true; + } + + std::shared_lock owner_lock{image_ctx.owner_lock}; + switch (m_state) { + case STATE_READ_DIRECTORY: + send_read_source_header(); + break; + 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: + ceph_abort(); + break; + } + return false; +} + +template <typename I> +int RenameRequest<I>::filter_return_code(int r) const { + I &image_ctx = this->m_image_ctx; + CephContext *cct = image_ctx.cct; + + if (m_state == STATE_READ_SOURCE_HEADER && r == -ENOENT) { + std::shared_lock image_locker{image_ctx.image_lock}; + if (image_ctx.name == m_dest_name) { + // signal that replay raced with itself + return -EEXIST; + } + } else 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_directory() { + I &image_ctx = this->m_image_ctx; + CephContext *cct = image_ctx.cct; + ldout(cct, 5) << this << " " << __func__ << dendl; + m_state = STATE_READ_DIRECTORY; + + librados::ObjectReadOperation op; + cls_client::dir_get_name_start(&op, image_ctx.id); + + auto comp = this->create_callback_completion(); + int r = image_ctx.md_ctx.aio_operate(RBD_DIRECTORY, comp, &op, + &m_source_name_bl); + ceph_assert(r == 0); + comp->release(); +} + +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); + ceph_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); + ceph_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); + ceph_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); + ceph_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>; |