Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 290 insertions, 0 deletions

diff --git a/src/librbd/mirror/GetInfoRequest.cc b/src/librbd/mirror/GetInfoRequest.cc
new file mode 100644
index 000000000..a7ee64567
--- /dev/null
+++ b/src/librbd/mirror/GetInfoRequest.cc
@@ -0,0 +1,290 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/mirror/GetInfoRequest.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "cls/rbd/cls_rbd_client.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+#include "librbd/Journal.h"
+#include "librbd/Utils.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::mirror::GetInfoRequest: " << this \
+                           << " " << __func__ << ": "
+
+namespace librbd {
+namespace mirror {
+
+using librbd::util::create_context_callback;
+using librbd::util::create_rados_callback;
+
+template <typename I>
+GetInfoRequest<I>::GetInfoRequest(librados::IoCtx& io_ctx,
+                                  asio::ContextWQ *op_work_queue,
+                                  const std::string &image_id,
+                                  cls::rbd::MirrorImage *mirror_image,
+                                  PromotionState *promotion_state,
+                                  std::string* primary_mirror_uuid,
+                                  Context *on_finish)
+  : m_io_ctx(io_ctx), m_op_work_queue(op_work_queue), m_image_id(image_id),
+    m_mirror_image(mirror_image), m_promotion_state(promotion_state),
+    m_primary_mirror_uuid(primary_mirror_uuid), m_on_finish(on_finish),
+    m_cct(reinterpret_cast<CephContext *>(io_ctx.cct())) {
+}
+
+template <typename I>
+GetInfoRequest<I>::GetInfoRequest(I &image_ctx,
+                                  cls::rbd::MirrorImage *mirror_image,
+                                  PromotionState *promotion_state,
+                                  std::string* primary_mirror_uuid,
+                                  Context *on_finish)
+  : m_image_ctx(&image_ctx), m_io_ctx(image_ctx.md_ctx),
+    m_op_work_queue(image_ctx.op_work_queue), m_image_id(image_ctx.id),
+    m_mirror_image(mirror_image), m_promotion_state(promotion_state),
+    m_primary_mirror_uuid(primary_mirror_uuid), m_on_finish(on_finish),
+    m_cct(image_ctx.cct) {
+}
+
+template <typename I>
+void GetInfoRequest<I>::send() {
+  get_mirror_image();
+}
+
+template <typename I>
+void GetInfoRequest<I>::get_mirror_image() {
+  ldout(m_cct, 20) << dendl;
+
+  librados::ObjectReadOperation op;
+  cls_client::mirror_image_get_start(&op, m_image_id);
+
+  librados::AioCompletion *comp = create_rados_callback<
+    GetInfoRequest<I>, &GetInfoRequest<I>::handle_get_mirror_image>(this);
+  int r = m_io_ctx.aio_operate(RBD_MIRRORING, comp, &op, &m_out_bl);
+  ceph_assert(r == 0);
+  comp->release();
+}
+
+template <typename I>
+void GetInfoRequest<I>::handle_get_mirror_image(int r) {
+  ldout(m_cct, 20) << "r=" << r << dendl;
+
+  m_mirror_image->state = cls::rbd::MIRROR_IMAGE_STATE_DISABLED;
+  *m_promotion_state = PROMOTION_STATE_NON_PRIMARY;
+  if (r == 0) {
+    auto iter = m_out_bl.cbegin();
+    r = cls_client::mirror_image_get_finish(&iter, m_mirror_image);
+  }
+
+  if (r == -ENOENT) {
+    ldout(m_cct, 20) << "mirroring is disabled" << dendl;
+    finish(r);
+    return;
+  } else if (r < 0) {
+    lderr(m_cct) << "failed to retrieve mirroring state: " << cpp_strerror(r)
+               << dendl;
+    finish(r);
+    return;
+  }
+
+  if (m_mirror_image->mode == cls::rbd::MIRROR_IMAGE_MODE_JOURNAL) {
+    get_journal_tag_owner();
+  } else if (m_mirror_image->mode == cls::rbd::MIRROR_IMAGE_MODE_SNAPSHOT) {
+    get_snapcontext();
+  } else {
+    ldout(m_cct, 20) << "unknown mirror image mode: " << m_mirror_image->mode
+                     << dendl;
+    finish(-EOPNOTSUPP);
+  }
+}
+
+template <typename I>
+void GetInfoRequest<I>::get_journal_tag_owner() {
+  ldout(m_cct, 20) << dendl;
+
+  auto ctx = create_context_callback<
+    GetInfoRequest<I>, &GetInfoRequest<I>::handle_get_journal_tag_owner>(this);
+  Journal<I>::get_tag_owner(m_io_ctx, m_image_id, &m_mirror_uuid,
+                            m_op_work_queue, ctx);
+}
+
+template <typename I>
+void GetInfoRequest<I>::handle_get_journal_tag_owner(int r) {
+  ldout(m_cct, 20) << "r=" << r << dendl;
+
+  if (r < 0) {
+    lderr(m_cct) << "failed to determine tag ownership: " << cpp_strerror(r)
+                 << dendl;
+    finish(r);
+    return;
+  }
+
+  if (m_mirror_uuid == Journal<>::LOCAL_MIRROR_UUID) {
+    *m_promotion_state = PROMOTION_STATE_PRIMARY;
+    *m_primary_mirror_uuid = "";
+  } else if (m_mirror_uuid == Journal<>::ORPHAN_MIRROR_UUID) {
+    *m_promotion_state = PROMOTION_STATE_ORPHAN;
+    *m_primary_mirror_uuid = "";
+  } else {
+    *m_primary_mirror_uuid = m_mirror_uuid;
+  }
+
+  finish(0);
+}
+
+template <typename I>
+void GetInfoRequest<I>::get_snapcontext() {
+  if (m_image_ctx != nullptr) {
+    {
+      std::shared_lock image_locker{m_image_ctx->image_lock};
+      calc_promotion_state(m_image_ctx->snap_info);
+    }
+    finish(0);
+    return;
+  }
+
+  ldout(m_cct, 20) << dendl;
+
+  librados::ObjectReadOperation op;
+  cls_client::get_snapcontext_start(&op);
+
+  librados::AioCompletion *comp = create_rados_callback<
+    GetInfoRequest<I>, &GetInfoRequest<I>::handle_get_snapcontext>(this);
+  m_out_bl.clear();
+  int r = m_io_ctx.aio_operate(util::header_name(m_image_id), comp, &op,
+                               &m_out_bl);
+  ceph_assert(r == 0);
+  comp->release();
+}
+
+template <typename I>
+void GetInfoRequest<I>::handle_get_snapcontext(int r) {
+  ldout(m_cct, 20) << "r=" << r << dendl;
+
+  if (r >= 0) {
+    auto it = m_out_bl.cbegin();
+    r = cls_client::get_snapcontext_finish(&it, &m_snapc);
+  }
+
+  if (r == -ENOENT &&
+      m_mirror_image->state == cls::rbd::MIRROR_IMAGE_STATE_CREATING) {
+    // image doesn't exist but we have a mirror image record for it
+    ldout(m_cct, 10) << "image does not exist for mirror image id "
+                     << m_image_id << dendl;
+    *m_promotion_state = PROMOTION_STATE_UNKNOWN;
+    *m_primary_mirror_uuid = "";
+    finish(0);
+    return;
+  } else if (r < 0) {
+    lderr(m_cct) << "failed to get snapcontext: " << cpp_strerror(r)
+                 << dendl;
+    finish(r);
+    return;
+  }
+
+  get_snapshots();
+}
+
+
+template <typename I>
+void GetInfoRequest<I>::get_snapshots() {
+  ldout(m_cct, 20) << dendl;
+
+  if (m_snapc.snaps.empty()) {
+    handle_get_snapshots(0);
+    return;
+  }
+
+  librados::ObjectReadOperation op;
+  for (auto snap_id : m_snapc.snaps) {
+    cls_client::snapshot_get_start(&op, snap_id);
+  }
+
+  librados::AioCompletion *comp = create_rados_callback<
+    GetInfoRequest<I>, &GetInfoRequest<I>::handle_get_snapshots>(this);
+  m_out_bl.clear();
+  int r = m_io_ctx.aio_operate(util::header_name(m_image_id), comp, &op,
+                               &m_out_bl);
+  ceph_assert(r == 0);
+  comp->release();
+}
+
+template <typename I>
+void GetInfoRequest<I>::handle_get_snapshots(int r) {
+  ldout(m_cct, 20) << "r=" << r << dendl;
+
+  std::map<librados::snap_t, SnapInfo> snap_info;
+
+  auto it = m_out_bl.cbegin();
+  for (auto snap_id : m_snapc.snaps) {
+    cls::rbd::SnapshotInfo snap;
+    if (r >= 0) {
+      r = cls_client::snapshot_get_finish(&it, &snap);
+    }
+    snap_info.emplace(
+      snap_id, SnapInfo(snap.name, snap.snapshot_namespace, 0, {}, 0, 0, {}));
+  }
+
+  if (r == -ENOENT) {
+    // restart
+    get_snapcontext();
+    return;
+  }
+
+  if (r < 0) {
+    lderr(m_cct) << "failed to get snapshots: " << cpp_strerror(r)
+                 << dendl;
+    finish(r);
+    return;
+  }
+
+  calc_promotion_state(snap_info);
+  finish(0);
+}
+
+template <typename I>
+void GetInfoRequest<I>::finish(int r) {
+  ldout(m_cct, 20) << "r=" << r << dendl;
+
+  m_on_finish->complete(r);
+  delete this;
+}
+
+template <typename I>
+void GetInfoRequest<I>::calc_promotion_state(
+    const std::map<librados::snap_t, SnapInfo> &snap_info) {
+  *m_promotion_state = PROMOTION_STATE_UNKNOWN;
+  *m_primary_mirror_uuid = "";
+
+  for (auto it = snap_info.rbegin(); it != snap_info.rend(); it++) {
+    auto mirror_ns = boost::get<cls::rbd::MirrorSnapshotNamespace>(
+      &it->second.snap_namespace);
+
+    if (mirror_ns != nullptr) {
+      switch (mirror_ns->state) {
+      case cls::rbd::MIRROR_SNAPSHOT_STATE_PRIMARY:
+        *m_promotion_state = PROMOTION_STATE_PRIMARY;
+        break;
+      case cls::rbd::MIRROR_SNAPSHOT_STATE_NON_PRIMARY:
+        *m_promotion_state = PROMOTION_STATE_NON_PRIMARY;
+        *m_primary_mirror_uuid = mirror_ns->primary_mirror_uuid;
+        break;
+      case cls::rbd::MIRROR_SNAPSHOT_STATE_PRIMARY_DEMOTED:
+      case cls::rbd::MIRROR_SNAPSHOT_STATE_NON_PRIMARY_DEMOTED:
+        *m_promotion_state = PROMOTION_STATE_ORPHAN;
+        break;
+      }
+      break;
+    }
+  }
+
+  ldout(m_cct, 10) << "promotion_state=" << *m_promotion_state << ", "
+                   << "primary_mirror_uuid=" << *m_primary_mirror_uuid << dendl;
+}
+
+} // namespace mirror
+} // namespace librbd
+
+template class librbd::mirror::GetInfoRequest<librbd::ImageCtx>;