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-rw-r--r--src/librbd/mirror/DemoteRequest.cc216
1 files changed, 216 insertions, 0 deletions
diff --git a/src/librbd/mirror/DemoteRequest.cc b/src/librbd/mirror/DemoteRequest.cc
new file mode 100644
index 000000000..350a76d83
--- /dev/null
+++ b/src/librbd/mirror/DemoteRequest.cc
@@ -0,0 +1,216 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/mirror/DemoteRequest.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "cls/rbd/cls_rbd_client.h"
+#include "librbd/ExclusiveLock.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+#include "librbd/Journal.h"
+#include "librbd/Utils.h"
+#include "librbd/mirror/GetInfoRequest.h"
+#include "librbd/mirror/snapshot/DemoteRequest.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::mirror::DemoteRequest: " << this \
+ << " " << __func__ << ": "
+
+namespace librbd {
+namespace mirror {
+
+using librbd::util::create_context_callback;
+
+template <typename I>
+void DemoteRequest<I>::send() {
+ get_info();
+}
+
+template <typename I>
+void DemoteRequest<I>::get_info() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << dendl;
+
+ auto ctx = create_context_callback<
+ DemoteRequest<I>, &DemoteRequest<I>::handle_get_info>(this);
+ auto req = GetInfoRequest<I>::create(m_image_ctx, &m_mirror_image,
+ &m_promotion_state,
+ &m_primary_mirror_uuid, ctx);
+ req->send();
+}
+
+template <typename I>
+void DemoteRequest<I>::handle_get_info(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << "r=" << r << dendl;
+
+ if (r < 0 && r != -ENOENT) {
+ lderr(cct) << "failed to retrieve mirroring state: " << cpp_strerror(r)
+ << dendl;
+ finish(r);
+ return;
+ } else if (m_mirror_image.state != cls::rbd::MIRROR_IMAGE_STATE_ENABLED) {
+ lderr(cct) << "mirroring is not currently enabled" << dendl;
+ finish(-EINVAL);
+ return;
+ } else if (m_promotion_state != PROMOTION_STATE_PRIMARY) {
+ lderr(cct) << "image is not primary" << dendl;
+ finish(-EINVAL);
+ return;
+ }
+
+ acquire_lock();
+}
+
+template <typename I>
+void DemoteRequest<I>::acquire_lock() {
+ CephContext *cct = m_image_ctx.cct;
+
+ m_image_ctx.owner_lock.lock_shared();
+ if (m_image_ctx.exclusive_lock == nullptr) {
+ m_image_ctx.owner_lock.unlock_shared();
+ if (m_mirror_image.mode == cls::rbd::MIRROR_IMAGE_MODE_JOURNAL) {
+ lderr(cct) << "exclusive lock is not active" << dendl;
+ finish(-EINVAL);
+ } else {
+ demote();
+ }
+ return;
+ }
+
+ // avoid accepting new requests from peers while we demote
+ // the image
+ m_image_ctx.exclusive_lock->block_requests(0);
+ m_blocked_requests = true;
+
+ if (m_image_ctx.exclusive_lock->is_lock_owner()) {
+ m_image_ctx.owner_lock.unlock_shared();
+ demote();
+ return;
+ }
+
+ ldout(cct, 20) << dendl;
+
+ auto ctx = create_context_callback<
+ DemoteRequest<I>,
+ &DemoteRequest<I>::handle_acquire_lock>(this, m_image_ctx.exclusive_lock);
+ m_image_ctx.exclusive_lock->acquire_lock(ctx);
+ m_image_ctx.owner_lock.unlock_shared();
+}
+
+template <typename I>
+void DemoteRequest<I>::handle_acquire_lock(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << "r=" << r << dendl;
+
+ if (r < 0) {
+ lderr(cct) << "failed to lock image: " << cpp_strerror(r) << dendl;
+ finish(r);
+ return;
+ }
+
+ m_image_ctx.owner_lock.lock_shared();
+ if (m_image_ctx.exclusive_lock != nullptr &&
+ !m_image_ctx.exclusive_lock->is_lock_owner()) {
+ r = m_image_ctx.exclusive_lock->get_unlocked_op_error();
+ m_image_ctx.owner_lock.unlock_shared();
+ lderr(cct) << "failed to acquire exclusive lock" << dendl;
+ finish(r);
+ return;
+ }
+ m_image_ctx.owner_lock.unlock_shared();
+
+ demote();
+}
+
+template <typename I>
+void DemoteRequest<I>::demote() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << dendl;
+
+ auto ctx = create_context_callback<
+ DemoteRequest<I>, &DemoteRequest<I>::handle_demote>(this);
+ if (m_mirror_image.mode == cls::rbd::MIRROR_IMAGE_MODE_JOURNAL) {
+ Journal<I>::demote(&m_image_ctx, ctx);
+ } else if (m_mirror_image.mode == cls::rbd::MIRROR_IMAGE_MODE_SNAPSHOT) {
+ auto req = mirror::snapshot::DemoteRequest<I>::create(
+ &m_image_ctx, m_mirror_image.global_image_id, ctx);
+ req->send();
+ } else {
+ lderr(cct) << "unknown image mirror mode: " << m_mirror_image.mode << dendl;
+ m_ret_val = -EOPNOTSUPP;
+ release_lock();
+ }
+}
+
+template <typename I>
+void DemoteRequest<I>::handle_demote(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 demote image: " << cpp_strerror(r) << dendl;
+ }
+
+ release_lock();
+}
+
+template <typename I>
+void DemoteRequest<I>::release_lock() {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << dendl;
+
+ m_image_ctx.owner_lock.lock_shared();
+ if (m_image_ctx.exclusive_lock == nullptr) {
+ m_image_ctx.owner_lock.unlock_shared();
+ finish(0);
+ return;
+ }
+
+ auto ctx = create_context_callback<
+ DemoteRequest<I>,
+ &DemoteRequest<I>::handle_release_lock>(this, m_image_ctx.exclusive_lock);
+ m_image_ctx.exclusive_lock->release_lock(ctx);
+ m_image_ctx.owner_lock.unlock_shared();
+}
+
+template <typename I>
+void DemoteRequest<I>::handle_release_lock(int r) {
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << "r=" << r << dendl;
+
+ if (r < 0) {
+ lderr(cct) << "failed to release exclusive lock: " << cpp_strerror(r)
+ << dendl;
+ }
+
+ finish(r);
+}
+
+template <typename I>
+void DemoteRequest<I>::finish(int r) {
+ if (m_ret_val < 0) {
+ r = m_ret_val;
+ }
+
+ {
+ std::shared_lock owner_locker{m_image_ctx.owner_lock};
+ if (m_blocked_requests && m_image_ctx.exclusive_lock != nullptr) {
+ m_image_ctx.exclusive_lock->unblock_requests();
+ }
+ }
+
+ CephContext *cct = m_image_ctx.cct;
+ ldout(cct, 20) << "r=" << r << dendl;
+
+ m_on_finish->complete(r);
+ delete this;
+}
+
+} // namespace mirror
+} // namespace librbd
+
+template class librbd::mirror::DemoteRequest<librbd::ImageCtx>;