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diff --git a/src/ceph/src/tools/rbd/action/Lock.cc b/src/ceph/src/tools/rbd/action/Lock.cc
new file mode 100644
index 0000000..60d63e8
--- /dev/null
+++ b/src/ceph/src/tools/rbd/action/Lock.cc
@@ -0,0 +1,266 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "tools/rbd/ArgumentTypes.h"
+#include "tools/rbd/Shell.h"
+#include "tools/rbd/Utils.h"
+#include "common/errno.h"
+#include "common/Formatter.h"
+#include "common/TextTable.h"
+#include <iostream>
+#include <boost/program_options.hpp>
+
+namespace rbd {
+namespace action {
+namespace lock {
+
+namespace at = argument_types;
+namespace po = boost::program_options;
+
+namespace {
+
+void add_id_option(po::options_description *positional) {
+  positional->add_options()
+    ("lock-id", "unique lock id");
+}
+
+int get_id(const po::variables_map &vm, std::string *id) {
+  *id = utils::get_positional_argument(vm, 1);
+  if (id->empty()) {
+    std::cerr << "rbd: lock id was not specified" << std::endl;
+    return -EINVAL;
+  }
+  return 0;
+}
+
+} // anonymous namespace
+
+static int do_lock_list(librbd::Image& image, Formatter *f)
+{
+  std::list<librbd::locker_t> lockers;
+  bool exclusive;
+  std::string tag;
+  TextTable tbl;
+  int r;
+
+  r = image.list_lockers(&lockers, &exclusive, &tag);
+  if (r < 0)
+    return r;
+
+  if (f) {
+    f->open_object_section("locks");
+  } else {
+    tbl.define_column("Locker", TextTable::LEFT, TextTable::LEFT);
+    tbl.define_column("ID", TextTable::LEFT, TextTable::LEFT);
+    tbl.define_column("Address", TextTable::LEFT, TextTable::LEFT);
+  }
+
+  if (lockers.size()) {
+    bool one = (lockers.size() == 1);
+
+    if (!f) {
+      std::cout << "There " << (one ? "is " : "are ") << lockers.size()
+           << (exclusive ? " exclusive" : " shared")
+           << " lock" << (one ? "" : "s") << " on this image.\n";
+      if (!exclusive)
+        std::cout << "Lock tag: " << tag << "\n";
+    }
+
+    for (std::list<librbd::locker_t>::const_iterator it = lockers.begin();
+         it != lockers.end(); ++it) {
+      if (f) {
+        f->open_object_section(it->cookie.c_str());
+        f->dump_string("locker", it->client);
+        f->dump_string("address", it->address);
+        f->close_section();
+      } else {
+        tbl << it->client << it->cookie << it->address << TextTable::endrow;
+      }
+    }
+    if (!f)
+      std::cout << tbl;
+  }
+
+  if (f) {
+    f->close_section();
+    f->flush(std::cout);
+  }
+  return 0;
+}
+
+static int do_lock_add(librbd::Image& image, const char *cookie,
+                       const char *tag)
+{
+  if (tag)
+    return image.lock_shared(cookie, tag);
+  else
+    return image.lock_exclusive(cookie);
+}
+
+static int do_lock_remove(librbd::Image& image, const char *client,
+                          const char *cookie)
+{
+  return image.break_lock(client, cookie);
+}
+
+void get_list_arguments(po::options_description *positional,
+                        po::options_description *options) {
+  at::add_image_spec_options(positional, options, at::ARGUMENT_MODIFIER_NONE);
+  at::add_format_options(options);
+}
+
+int execute_list(const po::variables_map &vm) {
+  size_t arg_index = 0;
+  std::string pool_name;
+  std::string image_name;
+  std::string snap_name;
+  int r = utils::get_pool_image_snapshot_names(
+    vm, at::ARGUMENT_MODIFIER_NONE, &arg_index, &pool_name, &image_name,
+    &snap_name, utils::SNAPSHOT_PRESENCE_NONE, utils::SPEC_VALIDATION_NONE);
+  if (r < 0) {
+    return r;
+  }
+
+  at::Format::Formatter formatter;
+  r = utils::get_formatter(vm, &formatter);
+  if (r < 0) {
+    return r;
+  }
+
+  librados::Rados rados;
+  librados::IoCtx io_ctx;
+  librbd::Image image;
+  r = utils::init_and_open_image(pool_name, image_name, "", "", true,
+                                 &rados, &io_ctx, &image);
+  if (r < 0) {
+    return r;
+  }
+
+  r = do_lock_list(image, formatter.get());
+  if (r < 0) {
+    std::cerr << "rbd: listing locks failed: " << cpp_strerror(r) << std::endl;
+    return r;
+  }
+  return 0;
+}
+
+void get_add_arguments(po::options_description *positional,
+                       po::options_description *options) {
+  at::add_image_spec_options(positional, options, at::ARGUMENT_MODIFIER_NONE);
+  add_id_option(positional);
+  options->add_options()
+    ("shared", po::value<std::string>(), "shared lock tag");
+}
+
+int execute_add(const po::variables_map &vm) {
+  size_t arg_index = 0;
+  std::string pool_name;
+  std::string image_name;
+  std::string snap_name;
+  int r = utils::get_pool_image_snapshot_names(
+    vm, at::ARGUMENT_MODIFIER_NONE, &arg_index, &pool_name, &image_name,
+    &snap_name, utils::SNAPSHOT_PRESENCE_NONE, utils::SPEC_VALIDATION_NONE);
+  if (r < 0) {
+    return r;
+  }
+
+  std::string lock_cookie;
+  r = get_id(vm, &lock_cookie);
+  if (r < 0) {
+    return r;
+  }
+
+  std::string lock_tag;
+  if (vm.count("shared")) {
+    lock_tag = vm["shared"].as<std::string>();
+  }
+
+  librados::Rados rados;
+  librados::IoCtx io_ctx;
+  librbd::Image image;
+  r = utils::init_and_open_image(pool_name, image_name, "", "", false,
+                                 &rados, &io_ctx, &image);
+  if (r < 0) {
+    return r;
+  }
+
+  r = do_lock_add(image, lock_cookie.c_str(),
+                  lock_tag.empty() ? nullptr : lock_tag.c_str());
+  if (r < 0) {
+    if (r == -EBUSY || r == -EEXIST) {
+      if (!lock_tag.empty()) {
+        std::cerr << "rbd: lock is already held by someone else"
+                  << " with a different tag" << std::endl;
+      } else {
+        std::cerr << "rbd: lock is already held by someone else" << std::endl;
+      }
+    } else {
+      std::cerr << "rbd: taking lock failed: " << cpp_strerror(r) << std::endl;
+    }
+    return r;
+  }
+  return 0;
+}
+
+void get_remove_arguments(po::options_description *positional,
+                          po::options_description *options) {
+  at::add_image_spec_options(positional, options, at::ARGUMENT_MODIFIER_NONE);
+  add_id_option(positional);
+  positional->add_options()
+    ("locker", "locker client");
+}
+
+int execute_remove(const po::variables_map &vm) {
+  size_t arg_index = 0;
+  std::string pool_name;
+  std::string image_name;
+  std::string snap_name;
+  int r = utils::get_pool_image_snapshot_names(
+    vm, at::ARGUMENT_MODIFIER_NONE, &arg_index, &pool_name, &image_name,
+    &snap_name, utils::SNAPSHOT_PRESENCE_NONE, utils::SPEC_VALIDATION_NONE);
+  if (r < 0) {
+    return r;
+  }
+
+  std::string lock_cookie;
+  r = get_id(vm, &lock_cookie);
+  if (r < 0) {
+    return r;
+  }
+
+  std::string lock_client = utils::get_positional_argument(vm, 2);
+  if (lock_client.empty()) {
+    std::cerr << "rbd: locker was not specified" << std::endl;
+    return -EINVAL;
+  }
+
+  librados::Rados rados;
+  librados::IoCtx io_ctx;
+  librbd::Image image;
+  r = utils::init_and_open_image(pool_name, image_name, "", "", false,
+                                 &rados, &io_ctx, &image);
+  if (r < 0) {
+    return r;
+  }
+
+  r = do_lock_remove(image, lock_client.c_str(), lock_cookie.c_str());
+  if (r < 0) {
+    std::cerr << "rbd: releasing lock failed: " << cpp_strerror(r) << std::endl;
+    return r;
+  }
+  return 0;
+}
+
+Shell::Action action_list(
+  {"lock", "list"}, {"lock", "ls"}, "Show locks held on an image.", "",
+  &get_list_arguments, &execute_list);
+Shell::Action action_add(
+  {"lock", "add"}, {}, "Take a lock on an image.", "",
+  &get_add_arguments, &execute_add);
+Shell::Action action_remove(
+  {"lock", "remove"}, {"lock", "rm"}, "Release a lock on an image.", "",
+  &get_remove_arguments, &execute_remove);
+
+} // namespace lock
+} // namespace action
+} // namespace rbd