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Diffstat (limited to '')
| -rw-r--r-- | src/librbd/journal/PromoteRequest.cc | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/src/librbd/journal/PromoteRequest.cc b/src/librbd/journal/PromoteRequest.cc new file mode 100644 index 000000000..f7ae45a92 --- /dev/null +++ b/src/librbd/journal/PromoteRequest.cc @@ -0,0 +1,237 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab + +#include "librbd/journal/PromoteRequest.h" +#include "common/dout.h" +#include "common/errno.h" +#include "journal/Journaler.h" +#include "journal/Settings.h" +#include "librbd/ImageCtx.h" +#include "librbd/Journal.h" +#include "librbd/Utils.h" +#include "librbd/asio/ContextWQ.h" +#include "librbd/journal/OpenRequest.h" + +#define dout_subsys ceph_subsys_rbd +#undef dout_prefix +#define dout_prefix *_dout << "librbd::journal::PromoteRequest: " << this \ + << " " << __func__ << ": " + +namespace librbd { +namespace journal { + +using librbd::util::create_async_context_callback; +using librbd::util::create_context_callback; + +template <typename I> +PromoteRequest<I>::PromoteRequest(I *image_ctx, bool force, Context *on_finish) + : m_image_ctx(image_ctx), m_force(force), m_on_finish(on_finish), + m_lock(ceph::make_mutex("PromoteRequest::m_lock")) { +} + +template <typename I> +void PromoteRequest<I>::send() { + send_open(); +} + +template <typename I> +void PromoteRequest<I>::send_open() { + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << dendl; + + m_journaler = new Journaler(m_image_ctx->md_ctx, m_image_ctx->id, + Journal<>::IMAGE_CLIENT_ID, {}, nullptr); + Context *ctx = create_async_context_callback( + *m_image_ctx, create_context_callback< + PromoteRequest<I>, &PromoteRequest<I>::handle_open>(this)); + auto open_req = OpenRequest<I>::create(m_image_ctx, m_journaler, + &m_lock, &m_client_meta, + &m_tag_tid, &m_tag_data, ctx); + open_req->send(); +} + +template <typename I> +void PromoteRequest<I>::handle_open(int r) { + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << "r=" << r << dendl; + + if (r < 0) { + m_ret_val = r; + lderr(cct) << "failed to open journal: " << cpp_strerror(r) << dendl; + shut_down(); + return; + } + + allocate_tag(); +} + +template <typename I> +void PromoteRequest<I>::allocate_tag() { + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << dendl; + + journal::TagPredecessor predecessor; + if (!m_force && m_tag_data.mirror_uuid == Journal<>::ORPHAN_MIRROR_UUID) { + // orderly promotion -- demotion epoch will have a single entry + // so link to our predecessor (demotion) epoch + predecessor = TagPredecessor{Journal<>::ORPHAN_MIRROR_UUID, true, m_tag_tid, + 1}; + } else { + // forced promotion -- create an epoch no peers can link against + predecessor = TagPredecessor{Journal<>::LOCAL_MIRROR_UUID, true, m_tag_tid, + 0}; + } + + TagData tag_data; + tag_data.mirror_uuid = Journal<>::LOCAL_MIRROR_UUID; + tag_data.predecessor = predecessor; + + bufferlist tag_bl; + encode(tag_data, tag_bl); + + Context *ctx = create_context_callback< + PromoteRequest<I>, &PromoteRequest<I>::handle_allocate_tag>(this); + m_journaler->allocate_tag(m_client_meta.tag_class, tag_bl, &m_tag, ctx); +} + +template <typename I> +void PromoteRequest<I>::handle_allocate_tag(int r) { + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << "r=" << r << dendl; + + if (r < 0) { + m_ret_val = r; + lderr(cct) << "failed to allocate tag: " << cpp_strerror(r) << dendl; + shut_down(); + return; + } + + m_tag_tid = m_tag.tid; + append_event(); +} + +template <typename I> +void PromoteRequest<I>::append_event() { + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << dendl; + + EventEntry event_entry{DemotePromoteEvent{}, {}}; + bufferlist event_entry_bl; + encode(event_entry, event_entry_bl); + + m_journaler->start_append(0); + m_future = m_journaler->append(m_tag_tid, event_entry_bl); + + auto ctx = create_context_callback< + PromoteRequest<I>, &PromoteRequest<I>::handle_append_event>(this); + m_future.flush(ctx); +} + +template <typename I> +void PromoteRequest<I>::handle_append_event(int r) { + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << "r=" << r << dendl; + + if (r < 0) { + m_ret_val = r; + lderr(cct) << "failed to append promotion journal event: " + << cpp_strerror(r) << dendl; + stop_append(); + return; + } + + commit_event(); +} + +template <typename I> +void PromoteRequest<I>::commit_event() { + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << dendl; + + m_journaler->committed(m_future); + + auto ctx = create_context_callback< + PromoteRequest<I>, &PromoteRequest<I>::handle_commit_event>(this); + m_journaler->flush_commit_position(ctx); +} + +template <typename I> +void PromoteRequest<I>::handle_commit_event(int r) { + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << "r=" << r << dendl; + + if (r < 0) { + m_ret_val = r; + lderr(cct) << "failed to flush promote commit position: " + << cpp_strerror(r) << dendl; + } + + stop_append(); +} + +template <typename I> +void PromoteRequest<I>::stop_append() { + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << dendl; + + auto ctx = create_context_callback< + PromoteRequest<I>, &PromoteRequest<I>::handle_stop_append>(this); + m_journaler->stop_append(ctx); +} + +template <typename I> +void PromoteRequest<I>::handle_stop_append(int r) { + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << "r=" << r << dendl; + + if (r < 0) { + if (m_ret_val == 0) { + m_ret_val = r; + } + lderr(cct) << "failed to stop journal append: " << cpp_strerror(r) << dendl; + } + + shut_down(); +} + +template <typename I> +void PromoteRequest<I>::shut_down() { + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << dendl; + + Context *ctx = create_async_context_callback( + *m_image_ctx, create_context_callback< + PromoteRequest<I>, &PromoteRequest<I>::handle_shut_down>(this)); + m_journaler->shut_down(ctx); +} + +template <typename I> +void PromoteRequest<I>::handle_shut_down(int r) { + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << "r=" << r << dendl; + + if (r < 0) { + lderr(cct) << "failed to shut down journal: " << cpp_strerror(r) << dendl; + } + + delete m_journaler; + finish(r); +} + +template <typename I> +void PromoteRequest<I>::finish(int r) { + if (m_ret_val < 0) { + r = m_ret_val; + } + + CephContext *cct = m_image_ctx->cct; + ldout(cct, 20) << "r=" << r << dendl; + + m_on_finish->complete(r); + delete this; +} + +} // namespace journal +} // namespace librbd + +template class librbd::journal::PromoteRequest<librbd::ImageCtx>; 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