X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Flibrbd%2Fapi%2FMirror.cc;fp=src%2Fceph%2Fsrc%2Flibrbd%2Fapi%2FMirror.cc;h=46e5135d3d9eee3c6d4f254f2ed309df9e600a1e;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/librbd/api/Mirror.cc b/src/ceph/src/librbd/api/Mirror.cc
new file mode 100644
index 0000000..46e5135
--- /dev/null
+++ b/src/ceph/src/librbd/api/Mirror.cc
@@ -0,0 +1,861 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/api/Mirror.h"
+#include "include/rados/librados.hpp"
+#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/api/Image.h"
+#include "librbd/mirror/DemoteRequest.h"
+#include "librbd/mirror/DisableRequest.h"
+#include "librbd/mirror/EnableRequest.h"
+#include "librbd/mirror/GetInfoRequest.h"
+#include "librbd/mirror/GetStatusRequest.h"
+#include "librbd/mirror/PromoteRequest.h"
+#include "librbd/mirror/Types.h"
+#include "librbd/MirroringWatcher.h"
+#include <boost/scope_exit.hpp>
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::api::Mirror: " << __func__ << ": "
+
+namespace librbd {
+namespace api {
+
+namespace {
+
+template <typename I>
+int validate_mirroring_enabled(I *ictx) {
+  CephContext *cct = ictx->cct;
+  cls::rbd::MirrorImage mirror_image_internal;
+  int r = cls_client::mirror_image_get(&ictx->md_ctx, ictx->id,
+      &mirror_image_internal);
+  if (r < 0 && r != -ENOENT) {
+    lderr(cct) << "failed to retrieve mirroring state: " << cpp_strerror(r)
+               << dendl;
+    return r;
+  } else if (mirror_image_internal.state !=
+               cls::rbd::MIRROR_IMAGE_STATE_ENABLED) {
+    lderr(cct) << "mirroring is not currently enabled" << dendl;
+    return -EINVAL;
+  }
+  return 0;
+}
+
+int list_mirror_images(librados::IoCtx& io_ctx,
+                       std::set<std::string>& mirror_image_ids) {
+  CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
+
+  std::string last_read = "";
+  int max_read = 1024;
+  int r;
+  do {
+    std::map<std::string, std::string> mirror_images;
+    r =  cls_client::mirror_image_list(&io_ctx, last_read, max_read,
+                                       &mirror_images);
+    if (r < 0 && r != -ENOENT) {
+      lderr(cct) << "error listing mirrored image directory: "
+                 << cpp_strerror(r) << dendl;
+      return r;
+    }
+    for (auto it = mirror_images.begin(); it != mirror_images.end(); ++it) {
+      mirror_image_ids.insert(it->first);
+    }
+    if (!mirror_images.empty()) {
+      last_read = mirror_images.rbegin()->first;
+    }
+    r = mirror_images.size();
+  } while (r == max_read);
+
+  return 0;
+}
+
+struct C_ImageGetInfo : public Context {
+  mirror_image_info_t *mirror_image_info;
+  Context *on_finish;
+
+  cls::rbd::MirrorImage mirror_image;
+  mirror::PromotionState promotion_state;
+
+  C_ImageGetInfo(mirror_image_info_t *mirror_image_info, Context *on_finish)
+    : mirror_image_info(mirror_image_info), on_finish(on_finish) {
+  }
+
+  void finish(int r) override {
+    if (r < 0) {
+      on_finish->complete(r);
+      return;
+    }
+
+    mirror_image_info->global_id = mirror_image.global_image_id;
+    mirror_image_info->state = static_cast<rbd_mirror_image_state_t>(
+      mirror_image.state);
+    mirror_image_info->primary = (
+      promotion_state == mirror::PROMOTION_STATE_PRIMARY);
+    on_finish->complete(0);
+  }
+};
+
+struct C_ImageGetStatus : public C_ImageGetInfo {
+  std::string image_name;
+  mirror_image_status_t *mirror_image_status;
+
+  cls::rbd::MirrorImageStatus mirror_image_status_internal;
+
+  C_ImageGetStatus(const std::string &image_name,
+                   mirror_image_status_t *mirror_image_status,
+                   Context *on_finish)
+    : C_ImageGetInfo(&mirror_image_status->info, on_finish),
+      image_name(image_name), mirror_image_status(mirror_image_status) {
+  }
+
+  void finish(int r) override {
+    if (r < 0) {
+      on_finish->complete(r);
+      return;
+    }
+
+    mirror_image_status->name = image_name;
+    mirror_image_status->state = static_cast<mirror_image_status_state_t>(
+      mirror_image_status_internal.state);
+    mirror_image_status->description = mirror_image_status_internal.description;
+    mirror_image_status->last_update =
+      mirror_image_status_internal.last_update.sec();
+    mirror_image_status->up = mirror_image_status_internal.up;
+    C_ImageGetInfo::finish(0);
+  }
+};
+
+} // anonymous namespace
+
+template <typename I>
+int Mirror<I>::image_enable(I *ictx, bool relax_same_pool_parent_check) {
+  CephContext *cct = ictx->cct;
+  ldout(cct, 20) << "ictx=" << ictx << dendl;
+
+  int r = ictx->state->refresh_if_required();
+  if (r < 0) {
+    return r;
+  }
+
+  cls::rbd::MirrorMode mirror_mode;
+  r = cls_client::mirror_mode_get(&ictx->md_ctx, &mirror_mode);
+  if (r < 0) {
+    lderr(cct) << "cannot enable mirroring: failed to retrieve mirror mode: "
+               << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  if (mirror_mode != cls::rbd::MIRROR_MODE_IMAGE) {
+    lderr(cct) << "cannot enable mirroring in the current pool mirroring mode"
+               << dendl;
+    return -EINVAL;
+  }
+
+  // is mirroring not enabled for the parent?
+  {
+    RWLock::RLocker l(ictx->parent_lock);
+    ImageCtx *parent = ictx->parent;
+    if (parent) {
+      if (relax_same_pool_parent_check &&
+          parent->md_ctx.get_id() == ictx->md_ctx.get_id()) {
+        if (!parent->test_features(RBD_FEATURE_JOURNALING)) {
+          lderr(cct) << "journaling is not enabled for the parent" << dendl;
+          return -EINVAL;
+        }
+      } else {
+        cls::rbd::MirrorImage mirror_image_internal;
+        r = cls_client::mirror_image_get(&(parent->md_ctx), parent->id,
+                                         &mirror_image_internal);
+        if (r == -ENOENT) {
+          lderr(cct) << "mirroring is not enabled for the parent" << dendl;
+          return -EINVAL;
+        }
+      }
+    }
+  }
+
+  if ((ictx->features & RBD_FEATURE_JOURNALING) == 0) {
+    lderr(cct) << "cannot enable mirroring: journaling is not enabled" << dendl;
+    return -EINVAL;
+  }
+
+  C_SaferCond ctx;
+  auto req = mirror::EnableRequest<ImageCtx>::create(ictx, &ctx);
+  req->send();
+
+  r = ctx.wait();
+  if (r < 0) {
+    lderr(cct) << "cannot enable mirroring: " << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  return 0;
+}
+
+template <typename I>
+int Mirror<I>::image_disable(I *ictx, bool force) {
+  CephContext *cct = ictx->cct;
+  ldout(cct, 20) << "ictx=" << ictx << dendl;
+
+  int r = ictx->state->refresh_if_required();
+  if (r < 0) {
+    return r;
+  }
+
+  cls::rbd::MirrorMode mirror_mode;
+  r = cls_client::mirror_mode_get(&ictx->md_ctx, &mirror_mode);
+  if (r < 0) {
+    lderr(cct) << "cannot disable mirroring: failed to retrieve pool "
+      "mirroring mode: " << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  if (mirror_mode != cls::rbd::MIRROR_MODE_IMAGE) {
+    lderr(cct) << "cannot disable mirroring in the current pool mirroring "
+      "mode" << dendl;
+    return -EINVAL;
+  }
+
+  // is mirroring  enabled for the child?
+  cls::rbd::MirrorImage mirror_image_internal;
+  r = cls_client::mirror_image_get(&ictx->md_ctx, ictx->id,
+                                   &mirror_image_internal);
+  if (r == -ENOENT) {
+    // mirroring is not enabled for this image
+    ldout(cct, 20) << "ignoring disable command: mirroring is not enabled for "
+                   << "this image" << dendl;
+    return 0;
+  } else if (r == -EOPNOTSUPP) {
+    ldout(cct, 5) << "mirroring not supported by OSD" << dendl;
+    return r;
+  } else if (r < 0) {
+    lderr(cct) << "failed to retrieve mirror image metadata: "
+               << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  mirror_image_internal.state = cls::rbd::MIRROR_IMAGE_STATE_DISABLING;
+  r = cls_client::mirror_image_set(&ictx->md_ctx, ictx->id,
+                                   mirror_image_internal);
+  if (r < 0) {
+    lderr(cct) << "cannot disable mirroring: " << cpp_strerror(r) << dendl;
+    return r;
+  } else {
+    bool rollback = false;
+    BOOST_SCOPE_EXIT_ALL(ictx, &mirror_image_internal, &rollback) {
+      if (rollback) {
+        CephContext *cct = ictx->cct;
+        mirror_image_internal.state = cls::rbd::MIRROR_IMAGE_STATE_ENABLED;
+        int r = cls_client::mirror_image_set(&ictx->md_ctx, ictx->id,
+                                             mirror_image_internal);
+        if (r < 0) {
+          lderr(cct) << "failed to re-enable image mirroring: "
+                     << cpp_strerror(r) << dendl;
+        }
+      }
+    };
+
+    {
+      RWLock::RLocker l(ictx->snap_lock);
+      map<librados::snap_t, SnapInfo> snap_info = ictx->snap_info;
+      for (auto &info : snap_info) {
+        ParentSpec parent_spec(ictx->md_ctx.get_id(), ictx->id, info.first);
+        map< pair<int64_t, string>, set<string> > image_info;
+
+        r = Image<I>::list_children(ictx, parent_spec, &image_info);
+        if (r < 0) {
+          rollback = true;
+          return r;
+        }
+        if (image_info.empty())
+          continue;
+
+        librados::Rados rados(ictx->md_ctx);
+        for (auto &info: image_info) {
+          librados::IoCtx ioctx;
+          r = rados.ioctx_create2(info.first.first, ioctx);
+          if (r < 0) {
+            rollback = true;
+            lderr(cct) << "error accessing child image pool "
+                       << info.first.second  << dendl;
+            return r;
+          }
+          for (auto &id_it : info.second) {
+            cls::rbd::MirrorImage mirror_image_internal;
+            r = cls_client::mirror_image_get(&ioctx, id_it,
+                                             &mirror_image_internal);
+            if (r != -ENOENT) {
+              rollback = true;
+              lderr(cct) << "mirroring is enabled on one or more children "
+                         << dendl;
+              return -EBUSY;
+            }
+          }
+        }
+      }
+    }
+
+    C_SaferCond ctx;
+    auto req = mirror::DisableRequest<ImageCtx>::create(ictx, force, true,
+                                                        &ctx);
+    req->send();
+
+    r = ctx.wait();
+    if (r < 0) {
+      lderr(cct) << "cannot disable mirroring: " << cpp_strerror(r) << dendl;
+      rollback = true;
+      return r;
+    }
+  }
+
+  return 0;
+}
+
+template <typename I>
+int Mirror<I>::image_promote(I *ictx, bool force) {
+  CephContext *cct = ictx->cct;
+
+  C_SaferCond ctx;
+  Mirror<I>::image_promote(ictx, force, &ctx);
+  int r = ctx.wait();
+  if (r < 0) {
+    lderr(cct) << "failed to promote image" << dendl;
+    return r;
+  }
+
+  return 0;
+}
+
+template <typename I>
+void Mirror<I>::image_promote(I *ictx, bool force, Context *on_finish) {
+  CephContext *cct = ictx->cct;
+  ldout(cct, 20) << "ictx=" << ictx << ", "
+                 << "force=" << force << dendl;
+
+  auto req = mirror::PromoteRequest<>::create(*ictx, force, on_finish);
+  req->send();
+}
+
+template <typename I>
+int Mirror<I>::image_demote(I *ictx) {
+  CephContext *cct = ictx->cct;
+
+  C_SaferCond ctx;
+  Mirror<I>::image_demote(ictx, &ctx);
+  int r = ctx.wait();
+  if (r < 0) {
+    lderr(cct) << "failed to demote image" << dendl;
+    return r;
+  }
+
+  return 0;
+}
+
+template <typename I>
+void Mirror<I>::image_demote(I *ictx, Context *on_finish) {
+  CephContext *cct = ictx->cct;
+  ldout(cct, 20) << "ictx=" << ictx << dendl;
+
+  auto req = mirror::DemoteRequest<>::create(*ictx, on_finish);
+  req->send();
+}
+
+template <typename I>
+int Mirror<I>::image_resync(I *ictx) {
+  CephContext *cct = ictx->cct;
+  ldout(cct, 20) << "ictx=" << ictx << dendl;
+
+  int r = ictx->state->refresh_if_required();
+  if (r < 0) {
+    return r;
+  }
+
+  r = validate_mirroring_enabled(ictx);
+  if (r < 0) {
+    return r;
+  }
+
+  C_SaferCond tag_owner_ctx;
+  bool is_tag_owner;
+  Journal<I>::is_tag_owner(ictx, &is_tag_owner, &tag_owner_ctx);
+  r = tag_owner_ctx.wait();
+  if (r < 0) {
+    lderr(cct) << "failed to determine tag ownership: " << cpp_strerror(r)
+               << dendl;
+    return r;
+  } else if (is_tag_owner) {
+    lderr(cct) << "image is primary, cannot resync to itself" << dendl;
+    return -EINVAL;
+  }
+
+  // flag the journal indicating that we want to rebuild the local image
+  r = Journal<I>::request_resync(ictx);
+  if (r < 0) {
+    lderr(cct) << "failed to request resync: " << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  return 0;
+}
+
+template <typename I>
+void Mirror<I>::image_get_info(I *ictx, mirror_image_info_t *mirror_image_info,
+                               size_t info_size, Context *on_finish) {
+  CephContext *cct = ictx->cct;
+  ldout(cct, 20) << "ictx=" << ictx << dendl;
+  if (info_size < sizeof(mirror_image_info_t)) {
+    on_finish->complete(-ERANGE);
+    return;
+  }
+
+  auto ctx = new C_ImageGetInfo(mirror_image_info, on_finish);
+  auto req = mirror::GetInfoRequest<I>::create(*ictx, &ctx->mirror_image,
+                                               &ctx->promotion_state,
+                                               ctx);
+  req->send();
+}
+
+template <typename I>
+int Mirror<I>::image_get_info(I *ictx, mirror_image_info_t *mirror_image_info,
+                              size_t info_size) {
+  C_SaferCond ctx;
+  image_get_info(ictx, mirror_image_info, info_size, &ctx);
+
+  int r = ctx.wait();
+  if (r < 0) {
+    return r;
+  }
+  return 0;
+}
+
+template <typename I>
+void Mirror<I>::image_get_status(I *ictx, mirror_image_status_t *status,
+                                 size_t status_size, Context *on_finish) {
+  CephContext *cct = ictx->cct;
+  ldout(cct, 20) << "ictx=" << ictx << dendl;
+  if (status_size < sizeof(mirror_image_status_t)) {
+    on_finish->complete(-ERANGE);
+    return;
+  }
+
+  auto ctx = new C_ImageGetStatus(ictx->name, status, on_finish);
+  auto req = mirror::GetStatusRequest<I>::create(
+    *ictx, &ctx->mirror_image_status_internal, &ctx->mirror_image,
+    &ctx->promotion_state, ctx);
+  req->send();
+}
+
+template <typename I>
+int Mirror<I>::image_get_status(I *ictx, mirror_image_status_t *status,
+      		                size_t status_size) {
+  C_SaferCond ctx;
+  image_get_status(ictx, status, status_size, &ctx);
+
+  int r = ctx.wait();
+  if (r < 0) {
+    return r;
+  }
+  return 0;
+}
+
+template <typename I>
+int Mirror<I>::mode_get(librados::IoCtx& io_ctx,
+                        rbd_mirror_mode_t *mirror_mode) {
+  CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
+  ldout(cct, 20) << dendl;
+
+  cls::rbd::MirrorMode mirror_mode_internal;
+  int r = cls_client::mirror_mode_get(&io_ctx, &mirror_mode_internal);
+  if (r < 0) {
+    lderr(cct) << "failed to retrieve mirror mode: " << cpp_strerror(r)
+               << dendl;
+    return r;
+  }
+
+  switch (mirror_mode_internal) {
+  case cls::rbd::MIRROR_MODE_DISABLED:
+  case cls::rbd::MIRROR_MODE_IMAGE:
+  case cls::rbd::MIRROR_MODE_POOL:
+    *mirror_mode = static_cast<rbd_mirror_mode_t>(mirror_mode_internal);
+    break;
+  default:
+    lderr(cct) << "unknown mirror mode ("
+               << static_cast<uint32_t>(mirror_mode_internal) << ")"
+               << dendl;
+    return -EINVAL;
+  }
+  return 0;
+}
+
+template <typename I>
+int Mirror<I>::mode_set(librados::IoCtx& io_ctx,
+                        rbd_mirror_mode_t mirror_mode) {
+  CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
+  ldout(cct, 20) << dendl;
+
+  cls::rbd::MirrorMode next_mirror_mode;
+  switch (mirror_mode) {
+  case RBD_MIRROR_MODE_DISABLED:
+  case RBD_MIRROR_MODE_IMAGE:
+  case RBD_MIRROR_MODE_POOL:
+    next_mirror_mode = static_cast<cls::rbd::MirrorMode>(mirror_mode);
+    break;
+  default:
+    lderr(cct) << "unknown mirror mode ("
+               << static_cast<uint32_t>(mirror_mode) << ")" << dendl;
+    return -EINVAL;
+  }
+
+  int r;
+  if (next_mirror_mode == cls::rbd::MIRROR_MODE_DISABLED) {
+    // fail early if pool still has peers registered and attempting to disable
+    std::vector<cls::rbd::MirrorPeer> mirror_peers;
+    r = cls_client::mirror_peer_list(&io_ctx, &mirror_peers);
+    if (r < 0 && r != -ENOENT) {
+      lderr(cct) << "failed to list peers: " << cpp_strerror(r) << dendl;
+      return r;
+    } else if (!mirror_peers.empty()) {
+      lderr(cct) << "mirror peers still registered" << dendl;
+      return -EBUSY;
+    }
+  }
+
+  cls::rbd::MirrorMode current_mirror_mode;
+  r = cls_client::mirror_mode_get(&io_ctx, &current_mirror_mode);
+  if (r < 0) {
+    lderr(cct) << "failed to retrieve mirror mode: " << cpp_strerror(r)
+               << dendl;
+    return r;
+  }
+
+  if (current_mirror_mode == next_mirror_mode) {
+    return 0;
+  } else if (current_mirror_mode == cls::rbd::MIRROR_MODE_DISABLED) {
+    uuid_d uuid_gen;
+    uuid_gen.generate_random();
+    r = cls_client::mirror_uuid_set(&io_ctx, uuid_gen.to_string());
+    if (r < 0) {
+      lderr(cct) << "failed to allocate mirroring uuid: " << cpp_strerror(r)
+                 << dendl;
+      return r;
+    }
+  }
+
+  if (current_mirror_mode != cls::rbd::MIRROR_MODE_IMAGE) {
+    r = cls_client::mirror_mode_set(&io_ctx, cls::rbd::MIRROR_MODE_IMAGE);
+    if (r < 0) {
+      lderr(cct) << "failed to set mirror mode to image: "
+                 << cpp_strerror(r) << dendl;
+      return r;
+    }
+
+    r = MirroringWatcher<>::notify_mode_updated(io_ctx,
+                                                cls::rbd::MIRROR_MODE_IMAGE);
+    if (r < 0) {
+      lderr(cct) << "failed to send update notification: " << cpp_strerror(r)
+                 << dendl;
+    }
+  }
+
+  if (next_mirror_mode == cls::rbd::MIRROR_MODE_IMAGE) {
+    return 0;
+  }
+
+  if (next_mirror_mode == cls::rbd::MIRROR_MODE_POOL) {
+    map<string, string> images;
+    r = Image<I>::list_images(io_ctx, &images);
+    if (r < 0) {
+      lderr(cct) << "failed listing images: " << cpp_strerror(r) << dendl;
+      return r;
+    }
+
+    for (const auto& img_pair : images) {
+      uint64_t features;
+      r = cls_client::get_features(&io_ctx,
+                                   util::header_name(img_pair.second),
+                                   CEPH_NOSNAP, &features);
+      if (r < 0) {
+        lderr(cct) << "error getting features for image " << img_pair.first
+                   << ": " << cpp_strerror(r) << dendl;
+        return r;
+      }
+
+      if ((features & RBD_FEATURE_JOURNALING) != 0) {
+        I *img_ctx = I::create("", img_pair.second, nullptr, io_ctx, false);
+        r = img_ctx->state->open(false);
+        if (r < 0) {
+          lderr(cct) << "error opening image "<< img_pair.first << ": "
+                     << cpp_strerror(r) << dendl;
+          return r;
+        }
+
+        r = image_enable(img_ctx, true);
+        int close_r = img_ctx->state->close();
+        if (r < 0) {
+          lderr(cct) << "error enabling mirroring for image "
+                     << img_pair.first << ": " << cpp_strerror(r) << dendl;
+          return r;
+        } else if (close_r < 0) {
+          lderr(cct) << "failed to close image " << img_pair.first << ": "
+                     << cpp_strerror(close_r) << dendl;
+          return close_r;
+        }
+      }
+    }
+  } else if (next_mirror_mode == cls::rbd::MIRROR_MODE_DISABLED) {
+    std::set<std::string> image_ids;
+    r = list_mirror_images(io_ctx, image_ids);
+    if (r < 0) {
+      lderr(cct) << "failed listing images: " << cpp_strerror(r) << dendl;
+      return r;
+    }
+
+    for (const auto& img_id : image_ids) {
+      if (current_mirror_mode == cls::rbd::MIRROR_MODE_IMAGE) {
+        cls::rbd::MirrorImage mirror_image;
+        r = cls_client::mirror_image_get(&io_ctx, img_id, &mirror_image);
+        if (r < 0 && r != -ENOENT) {
+          lderr(cct) << "failed to retrieve mirroring state for image id "
+                     << img_id << ": " << cpp_strerror(r) << dendl;
+          return r;
+        }
+        if (mirror_image.state == cls::rbd::MIRROR_IMAGE_STATE_ENABLED) {
+          lderr(cct) << "failed to disable mirror mode: there are still "
+                     << "images with mirroring enabled" << dendl;
+          return -EINVAL;
+        }
+      } else {
+        I *img_ctx = I::create("", img_id, nullptr, io_ctx, false);
+        r = img_ctx->state->open(false);
+        if (r < 0) {
+          lderr(cct) << "error opening image id "<< img_id << ": "
+                     << cpp_strerror(r) << dendl;
+          return r;
+        }
+
+        r = image_disable(img_ctx, false);
+        int close_r = img_ctx->state->close();
+        if (r < 0) {
+          lderr(cct) << "error disabling mirroring for image id " << img_id
+                     << cpp_strerror(r) << dendl;
+          return r;
+        } else if (close_r < 0) {
+          lderr(cct) << "failed to close image id " << img_id << ": "
+                     << cpp_strerror(close_r) << dendl;
+          return close_r;
+        }
+      }
+    }
+  }
+
+  r = cls_client::mirror_mode_set(&io_ctx, next_mirror_mode);
+  if (r < 0) {
+    lderr(cct) << "failed to set mirror mode: " << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  r = MirroringWatcher<>::notify_mode_updated(io_ctx, next_mirror_mode);
+  if (r < 0) {
+    lderr(cct) << "failed to send update notification: " << cpp_strerror(r)
+               << dendl;
+  }
+  return 0;
+}
+
+template <typename I>
+int Mirror<I>::peer_add(librados::IoCtx& io_ctx, std::string *uuid,
+                        const std::string &cluster_name,
+                        const std::string &client_name) {
+  CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
+  ldout(cct, 20) << "name=" << cluster_name << ", "
+                 << "client=" << client_name << dendl;
+
+  if (cct->_conf->cluster == cluster_name) {
+    lderr(cct) << "cannot add self as remote peer" << dendl;
+    return -EINVAL;
+  }
+
+  int r;
+  do {
+    uuid_d uuid_gen;
+    uuid_gen.generate_random();
+
+    *uuid = uuid_gen.to_string();
+    r = cls_client::mirror_peer_add(&io_ctx, *uuid, cluster_name,
+                                    client_name);
+    if (r == -ESTALE) {
+      ldout(cct, 5) << "duplicate UUID detected, retrying" << dendl;
+    } else if (r < 0) {
+      lderr(cct) << "failed to add mirror peer '" << uuid << "': "
+                 << cpp_strerror(r) << dendl;
+      return r;
+    }
+  } while (r == -ESTALE);
+  return 0;
+}
+
+template <typename I>
+int Mirror<I>::peer_remove(librados::IoCtx& io_ctx, const std::string &uuid) {
+  CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
+  ldout(cct, 20) << "uuid=" << uuid << dendl;
+
+  int r = cls_client::mirror_peer_remove(&io_ctx, uuid);
+  if (r < 0 && r != -ENOENT) {
+    lderr(cct) << "failed to remove peer '" << uuid << "': "
+               << cpp_strerror(r) << dendl;
+    return r;
+  }
+  return 0;
+}
+
+template <typename I>
+int Mirror<I>::peer_list(librados::IoCtx& io_ctx,
+                         std::vector<mirror_peer_t> *peers) {
+  CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
+  ldout(cct, 20) << dendl;
+
+  std::vector<cls::rbd::MirrorPeer> mirror_peers;
+  int r = cls_client::mirror_peer_list(&io_ctx, &mirror_peers);
+  if (r < 0 && r != -ENOENT) {
+    lderr(cct) << "failed to list peers: " << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  peers->clear();
+  peers->reserve(mirror_peers.size());
+  for (auto &mirror_peer : mirror_peers) {
+    mirror_peer_t peer;
+    peer.uuid = mirror_peer.uuid;
+    peer.cluster_name = mirror_peer.cluster_name;
+    peer.client_name = mirror_peer.client_name;
+    peers->push_back(peer);
+  }
+  return 0;
+}
+
+template <typename I>
+int Mirror<I>::peer_set_client(librados::IoCtx& io_ctx, const std::string &uuid,
+                               const std::string &client_name) {
+  CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
+  ldout(cct, 20) << "uuid=" << uuid << ", "
+                 << "client=" << client_name << dendl;
+
+  int r = cls_client::mirror_peer_set_client(&io_ctx, uuid, client_name);
+  if (r < 0) {
+    lderr(cct) << "failed to update client '" << uuid << "': "
+               << cpp_strerror(r) << dendl;
+    return r;
+  }
+  return 0;
+}
+
+template <typename I>
+int Mirror<I>::peer_set_cluster(librados::IoCtx& io_ctx,
+                                const std::string &uuid,
+                                const std::string &cluster_name) {
+  CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
+  ldout(cct, 20) << "uuid=" << uuid << ", "
+                 << "cluster=" << cluster_name << dendl;
+
+  int r = cls_client::mirror_peer_set_cluster(&io_ctx, uuid, cluster_name);
+  if (r < 0) {
+    lderr(cct) << "failed to update cluster '" << uuid << "': "
+               << cpp_strerror(r) << dendl;
+    return r;
+  }
+  return 0;
+}
+
+template <typename I>
+int Mirror<I>::image_status_list(librados::IoCtx& io_ctx,
+                                  const std::string &start_id, size_t max,
+                                  IdToMirrorImageStatus *images) {
+  CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
+  int r;
+
+  map<string, string> id_to_name;
+  {
+    map<string, string> name_to_id;
+    r = Image<I>::list_images(io_ctx, &name_to_id);
+    if (r < 0) {
+      return r;
+    }
+    for (auto it : name_to_id) {
+      id_to_name[it.second] = it.first;
+    }
+  }
+
+  map<std::string, cls::rbd::MirrorImage> images_;
+  map<std::string, cls::rbd::MirrorImageStatus> statuses_;
+
+  r = librbd::cls_client::mirror_image_status_list(&io_ctx, start_id, max,
+      					           &images_, &statuses_);
+  if (r < 0 && r != -ENOENT) {
+    lderr(cct) << "failed to list mirror image statuses: "
+               << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  cls::rbd::MirrorImageStatus unknown_status(
+    cls::rbd::MIRROR_IMAGE_STATUS_STATE_UNKNOWN, "status not found");
+
+  for (auto it = images_.begin(); it != images_.end(); ++it) {
+    auto &image_id = it->first;
+    auto &info = it->second;
+    if (info.state == cls::rbd::MIRROR_IMAGE_STATE_DISABLED) {
+      continue;
+    }
+
+    auto &image_name = id_to_name[image_id];
+    if (image_name.empty()) {
+      lderr(cct) << "failed to find image name for image " << image_id << ", "
+      	         << "using image id as name" << dendl;
+      image_name = image_id;
+    }
+    auto s_it = statuses_.find(image_id);
+    auto &s = s_it != statuses_.end() ? s_it->second : unknown_status;
+    (*images)[image_id] = mirror_image_status_t{
+      image_name,
+      mirror_image_info_t{
+        info.global_image_id,
+        static_cast<mirror_image_state_t>(info.state),
+        false}, // XXX: To set "primary" right would require an additional call.
+      static_cast<mirror_image_status_state_t>(s.state),
+      s.description,
+      s.last_update.sec(),
+      s.up};
+  }
+
+  return 0;
+}
+
+template <typename I>
+int Mirror<I>::image_status_summary(librados::IoCtx& io_ctx,
+                                    MirrorImageStatusStates *states) {
+  CephContext *cct = reinterpret_cast<CephContext *>(io_ctx.cct());
+
+  std::map<cls::rbd::MirrorImageStatusState, int> states_;
+  int r = cls_client::mirror_image_status_get_summary(&io_ctx, &states_);
+  if (r < 0 && r != -ENOENT) {
+    lderr(cct) << "failed to get mirror status summary: "
+               << cpp_strerror(r) << dendl;
+    return r;
+  }
+  for (auto &s : states_) {
+    (*states)[static_cast<mirror_image_status_state_t>(s.first)] = s.second;
+  }
+  return 0;
+}
+
+} // namespace api
+} // namespace librbd
+
+template class librbd::api::Mirror<librbd::ImageCtx>;