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diff --git a/src/ceph/src/librbd/ObjectMap.cc b/src/ceph/src/librbd/ObjectMap.cc
new file mode 100644
index 0000000..257554d
--- /dev/null
+++ b/src/ceph/src/librbd/ObjectMap.cc
@@ -0,0 +1,323 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/ObjectMap.h"
+#include "librbd/BlockGuard.h"
+#include "librbd/ExclusiveLock.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/object_map/RefreshRequest.h"
+#include "librbd/object_map/ResizeRequest.h"
+#include "librbd/object_map/SnapshotCreateRequest.h"
+#include "librbd/object_map/SnapshotRemoveRequest.h"
+#include "librbd/object_map/SnapshotRollbackRequest.h"
+#include "librbd/object_map/UnlockRequest.h"
+#include "librbd/object_map/UpdateRequest.h"
+#include "librbd/Utils.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "common/WorkQueue.h"
+
+#include "include/rados/librados.hpp"
+
+#include "cls/lock/cls_lock_client.h"
+#include "cls/rbd/cls_rbd_types.h"
+#include "include/stringify.h"
+#include "osdc/Striper.h"
+#include <sstream>
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::ObjectMap: " << this << " " << __func__ \
+                           << ": "
+
+namespace librbd {
+
+template <typename I>
+ObjectMap<I>::ObjectMap(I &image_ctx, uint64_t snap_id)
+  : m_image_ctx(image_ctx), m_snap_id(snap_id),
+    m_update_guard(new UpdateGuard(m_image_ctx.cct)) {
+}
+
+template <typename I>
+ObjectMap<I>::~ObjectMap() {
+  delete m_update_guard;
+}
+
+template <typename I>
+int ObjectMap<I>::aio_remove(librados::IoCtx &io_ctx, const std::string &image_id,
+			     librados::AioCompletion *c) {
+  return io_ctx.aio_remove(object_map_name(image_id, CEPH_NOSNAP), c);
+}
+
+template <typename I>
+std::string ObjectMap<I>::object_map_name(const std::string &image_id,
+				          uint64_t snap_id) {
+  std::string oid(RBD_OBJECT_MAP_PREFIX + image_id);
+  if (snap_id != CEPH_NOSNAP) {
+    std::stringstream snap_suffix;
+    snap_suffix << "." << std::setfill('0') << std::setw(16) << std::hex
+		<< snap_id;
+    oid += snap_suffix.str();
+  }
+  return oid;
+}
+
+template <typename I>
+bool ObjectMap<I>::is_compatible(const file_layout_t& layout, uint64_t size) {
+  uint64_t object_count = Striper::get_num_objects(layout, size);
+  return (object_count <= cls::rbd::MAX_OBJECT_MAP_OBJECT_COUNT);
+}
+
+template <typename I>
+ceph::BitVector<2u>::Reference ObjectMap<I>::operator[](uint64_t object_no)
+{
+  assert(m_image_ctx.object_map_lock.is_wlocked());
+  assert(object_no < m_object_map.size());
+  return m_object_map[object_no];
+}
+
+template <typename I>
+uint8_t ObjectMap<I>::operator[](uint64_t object_no) const
+{
+  assert(m_image_ctx.object_map_lock.is_locked());
+  assert(object_no < m_object_map.size());
+  return m_object_map[object_no];
+}
+
+template <typename I>
+bool ObjectMap<I>::object_may_exist(uint64_t object_no) const
+{
+  assert(m_image_ctx.snap_lock.is_locked());
+
+  // Fall back to default logic if object map is disabled or invalid
+  if (!m_image_ctx.test_features(RBD_FEATURE_OBJECT_MAP,
+                                 m_image_ctx.snap_lock)) {
+    return true;
+  }
+
+  bool flags_set;
+  int r = m_image_ctx.test_flags(RBD_FLAG_OBJECT_MAP_INVALID,
+                                 m_image_ctx.snap_lock, &flags_set);
+  if (r < 0 || flags_set) {
+    return true;
+  }
+
+  RWLock::RLocker l(m_image_ctx.object_map_lock);
+  uint8_t state = (*this)[object_no];
+  bool exists = (state != OBJECT_NONEXISTENT);
+  ldout(m_image_ctx.cct, 20) << "object_no=" << object_no << " r=" << exists
+			     << dendl;
+  return exists;
+}
+
+template <typename I>
+bool ObjectMap<I>::update_required(const ceph::BitVector<2>::Iterator& it,
+                                   uint8_t new_state) {
+  assert(m_image_ctx.object_map_lock.is_wlocked());
+  uint8_t state = *it;
+  if ((state == new_state) ||
+      (new_state == OBJECT_PENDING && state == OBJECT_NONEXISTENT) ||
+      (new_state == OBJECT_NONEXISTENT && state != OBJECT_PENDING)) {
+    return false;
+  }
+  return true;
+}
+
+template <typename I>
+void ObjectMap<I>::open(Context *on_finish) {
+  auto req = object_map::RefreshRequest<I>::create(
+    m_image_ctx, &m_object_map, m_snap_id, on_finish);
+  req->send();
+}
+
+template <typename I>
+void ObjectMap<I>::close(Context *on_finish) {
+  if (m_snap_id != CEPH_NOSNAP) {
+    m_image_ctx.op_work_queue->queue(on_finish, 0);
+    return;
+  }
+
+  auto req = object_map::UnlockRequest<I>::create(m_image_ctx, on_finish);
+  req->send();
+}
+
+template <typename I>
+void ObjectMap<I>::rollback(uint64_t snap_id, Context *on_finish) {
+  assert(m_image_ctx.snap_lock.is_locked());
+  assert(m_image_ctx.object_map_lock.is_wlocked());
+
+  object_map::SnapshotRollbackRequest *req =
+    new object_map::SnapshotRollbackRequest(m_image_ctx, snap_id, on_finish);
+  req->send();
+}
+
+template <typename I>
+void ObjectMap<I>::snapshot_add(uint64_t snap_id, Context *on_finish) {
+  assert(m_image_ctx.snap_lock.is_locked());
+  assert((m_image_ctx.features & RBD_FEATURE_OBJECT_MAP) != 0);
+  assert(snap_id != CEPH_NOSNAP);
+
+  object_map::SnapshotCreateRequest *req =
+    new object_map::SnapshotCreateRequest(m_image_ctx, &m_object_map, snap_id,
+                                          on_finish);
+  req->send();
+}
+
+template <typename I>
+void ObjectMap<I>::snapshot_remove(uint64_t snap_id, Context *on_finish) {
+  assert(m_image_ctx.snap_lock.is_wlocked());
+  assert((m_image_ctx.features & RBD_FEATURE_OBJECT_MAP) != 0);
+  assert(snap_id != CEPH_NOSNAP);
+
+  object_map::SnapshotRemoveRequest *req =
+    new object_map::SnapshotRemoveRequest(m_image_ctx, &m_object_map, snap_id,
+                                          on_finish);
+  req->send();
+}
+
+template <typename I>
+void ObjectMap<I>::aio_save(Context *on_finish) {
+  assert(m_image_ctx.owner_lock.is_locked());
+  assert(m_image_ctx.snap_lock.is_locked());
+  assert(m_image_ctx.test_features(RBD_FEATURE_OBJECT_MAP,
+                                   m_image_ctx.snap_lock));
+  RWLock::RLocker object_map_locker(m_image_ctx.object_map_lock);
+
+  librados::ObjectWriteOperation op;
+  if (m_snap_id == CEPH_NOSNAP) {
+    rados::cls::lock::assert_locked(&op, RBD_LOCK_NAME, LOCK_EXCLUSIVE, "", "");
+  }
+  cls_client::object_map_save(&op, m_object_map);
+
+  std::string oid(object_map_name(m_image_ctx.id, m_snap_id));
+  librados::AioCompletion *comp = util::create_rados_callback(on_finish);
+
+  int r = m_image_ctx.md_ctx.aio_operate(oid, comp, &op);
+  assert(r == 0);
+  comp->release();
+}
+
+template <typename I>
+void ObjectMap<I>::aio_resize(uint64_t new_size, uint8_t default_object_state,
+			      Context *on_finish) {
+  assert(m_image_ctx.owner_lock.is_locked());
+  assert(m_image_ctx.snap_lock.is_locked());
+  assert(m_image_ctx.test_features(RBD_FEATURE_OBJECT_MAP,
+                                   m_image_ctx.snap_lock));
+  assert(m_image_ctx.image_watcher != NULL);
+  assert(m_image_ctx.exclusive_lock == nullptr ||
+         m_image_ctx.exclusive_lock->is_lock_owner());
+
+  object_map::ResizeRequest *req = new object_map::ResizeRequest(
+    m_image_ctx, &m_object_map, m_snap_id, new_size, default_object_state,
+    on_finish);
+  req->send();
+}
+
+template <typename I>
+void ObjectMap<I>::detained_aio_update(UpdateOperation &&op) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << dendl;
+
+  assert(m_image_ctx.snap_lock.is_locked());
+  assert(m_image_ctx.object_map_lock.is_wlocked());
+
+  BlockGuardCell *cell;
+  int r = m_update_guard->detain({op.start_object_no, op.end_object_no},
+                                 &op, &cell);
+  if (r < 0) {
+    lderr(cct) << "failed to detain object map update: " << cpp_strerror(r)
+               << dendl;
+    m_image_ctx.op_work_queue->queue(op.on_finish, r);
+    return;
+  } else if (r > 0) {
+    ldout(cct, 20) << "detaining object map update due to in-flight update: "
+                   << "start=" << op.start_object_no << ", "
+		   << "end=" << op.end_object_no << ", "
+                   << (op.current_state ?
+                         stringify(static_cast<uint32_t>(*op.current_state)) :
+                         "")
+		   << "->" << static_cast<uint32_t>(op.new_state) << dendl;
+    return;
+  }
+
+  ldout(cct, 20) << "in-flight update cell: " << cell << dendl;
+  Context *on_finish = op.on_finish;
+  Context *ctx = new FunctionContext([this, cell, on_finish](int r) {
+      handle_detained_aio_update(cell, r, on_finish);
+    });
+  aio_update(CEPH_NOSNAP, op.start_object_no, op.end_object_no, op.new_state,
+             op.current_state, op.parent_trace, ctx);
+}
+
+template <typename I>
+void ObjectMap<I>::handle_detained_aio_update(BlockGuardCell *cell, int r,
+                                              Context *on_finish) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << "cell=" << cell << ", r=" << r << dendl;
+
+  typename UpdateGuard::BlockOperations block_ops;
+  m_update_guard->release(cell, &block_ops);
+
+  {
+    RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
+    RWLock::WLocker object_map_locker(m_image_ctx.object_map_lock);
+    for (auto &op : block_ops) {
+      detained_aio_update(std::move(op));
+    }
+  }
+
+  on_finish->complete(r);
+}
+
+template <typename I>
+void ObjectMap<I>::aio_update(uint64_t snap_id, uint64_t start_object_no,
+                              uint64_t end_object_no, uint8_t new_state,
+                              const boost::optional<uint8_t> &current_state,
+                              const ZTracer::Trace &parent_trace,
+                              Context *on_finish) {
+  assert(m_image_ctx.snap_lock.is_locked());
+  assert((m_image_ctx.features & RBD_FEATURE_OBJECT_MAP) != 0);
+  assert(m_image_ctx.image_watcher != nullptr);
+  assert(m_image_ctx.exclusive_lock == nullptr ||
+         m_image_ctx.exclusive_lock->is_lock_owner());
+  assert(snap_id != CEPH_NOSNAP || m_image_ctx.object_map_lock.is_wlocked());
+  assert(start_object_no < end_object_no);
+
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << "start=" << start_object_no << ", "
+		 << "end=" << end_object_no << ", "
+                 << (current_state ?
+                       stringify(static_cast<uint32_t>(*current_state)) : "")
+		 << "->" << static_cast<uint32_t>(new_state) << dendl;
+  if (snap_id == CEPH_NOSNAP) {
+    if (end_object_no > m_object_map.size()) {
+      ldout(cct, 20) << "skipping update of invalid object map" << dendl;
+      m_image_ctx.op_work_queue->queue(on_finish, 0);
+      return;
+    }
+
+    auto it = m_object_map.begin() + start_object_no;
+    auto end_it = m_object_map.begin() + end_object_no;
+    for (; it != end_it; ++it) {
+      if (update_required(it, new_state)) {
+        break;
+      }
+    }
+    if (it == end_it) {
+      ldout(cct, 20) << "object map update not required" << dendl;
+      m_image_ctx.op_work_queue->queue(on_finish, 0);
+      return;
+    }
+  }
+
+  auto req = object_map::UpdateRequest<I>::create(
+    m_image_ctx, &m_object_map, snap_id, start_object_no, end_object_no,
+    new_state, current_state, parent_trace, on_finish);
+  req->send();
+}
+
+} // namespace librbd
+
+template class librbd::ObjectMap<librbd::ImageCtx>;
+