1 files changed, 429 insertions, 0 deletions
diff --git a/src/tools/rbd/action/Migration.cc b/src/tools/rbd/action/Migration.cc
new file mode 100644
index 000000000..1ce6201d9
--- /dev/null
+++ b/src/tools/rbd/action/Migration.cc
@@ -0,0 +1,429 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "include/compat.h"
+#include "common/errno.h"
+#include "common/safe_io.h"
+
+#include "tools/rbd/ArgumentTypes.h"
+#include "tools/rbd/Shell.h"
+#include "tools/rbd/Utils.h"
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <iostream>
+#include <boost/program_options.hpp>
+
+namespace rbd {
+namespace action {
+namespace migration {
+
+namespace at = argument_types;
+namespace po = boost::program_options;
+
+static int do_execute(librados::IoCtx& io_ctx, const std::string &image_name,
+                      bool no_progress) {
+  utils::ProgressContext pc("Image migration", no_progress);
+  int r = librbd::RBD().migration_execute_with_progress(io_ctx,
+                                                        image_name.c_str(), pc);
+  if (r < 0) {
+    pc.fail();
+    std::cerr << "rbd: migration failed: " << cpp_strerror(r) << std::endl;
+    return r;
+  }
+  pc.finish();
+  return 0;
+}
+
+static int do_abort(librados::IoCtx& io_ctx, const std::string &image_name,
+                    bool no_progress) {
+  utils::ProgressContext pc("Abort image migration", no_progress);
+  int r = librbd::RBD().migration_abort_with_progress(io_ctx,
+                                                      image_name.c_str(), pc);
+  if (r < 0) {
+    pc.fail();
+    std::cerr << "rbd: aborting migration failed: " << cpp_strerror(r)
+              << std::endl;
+    return r;
+  }
+  pc.finish();
+  return 0;
+}
+
+static int do_commit(librados::IoCtx& io_ctx, const std::string &image_name,
+                     bool force, bool no_progress) {
+  librbd::image_migration_status_t migration_status;
+  int r = librbd::RBD().migration_status(io_ctx, image_name.c_str(),
+                                         &migration_status,
+                                         sizeof(migration_status));
+  if (r < 0) {
+    std::cerr << "rbd: getting migration status failed: " << cpp_strerror(r)
+              << std::endl;
+    return r;
+  }
+
+  librados::IoCtx dst_io_ctx;
+  r = librados::Rados(io_ctx).ioctx_create2(migration_status.dest_pool_id, dst_io_ctx);
+  if (r < 0) {
+    std::cerr << "rbd: accessing source pool id="
+              << migration_status.dest_pool_id << " failed: "
+              << cpp_strerror(r) << std::endl;
+    return r;
+  }
+
+  r = utils::set_namespace(migration_status.dest_pool_namespace, &dst_io_ctx);
+  if (r < 0) {
+    return r;
+  }
+
+  librbd::Image image;
+  r = utils::open_image_by_id(dst_io_ctx, migration_status.dest_image_id,
+                              true, &image);
+  if (r < 0) {
+    return r;
+  }
+
+  std::vector<librbd::linked_image_spec_t> children;
+  r = image.list_descendants(&children);
+  if (r < 0) {
+    std::cerr << "rbd: listing descendants failed: " << cpp_strerror(r)
+              << std::endl;
+    return r;
+  }
+
+  if (children.size() > 0) {
+    std::cerr << "rbd: the image has "
+              << (children.size() == 1 ? "a descendant" : "descendants") << ": "
+              << std::endl;
+    for (auto& child : children) {
+      std::cerr << "  " << child.pool_name << "/";
+      if (!child.pool_namespace.empty()) {
+        std::cerr << child.pool_namespace << "/";
+      }
+      std::cerr << child.image_name;
+      if (child.trash) {
+        std::cerr << " (trash " << child.image_id << ")";
+      }
+      std::cerr << std::endl;
+    }
+    std::cerr << "Warning: in-use, read-only descendant images"
+              << " will not detect the parent update." << std::endl;
+    if (force) {
+      std::cerr << "Proceeding anyway due to force flag set." << std::endl;
+    } else {
+      std::cerr << "Ensure no descendant images are opened read-only"
+                << " and run again with force flag." << std::endl;
+      return -EBUSY;
+    }
+  }
+
+  utils::ProgressContext pc("Commit image migration", no_progress);
+  r = librbd::RBD().migration_commit_with_progress(io_ctx, image_name.c_str(),
+                                                   pc);
+  if (r < 0) {
+    pc.fail();
+    std::cerr << "rbd: committing migration failed: " << cpp_strerror(r)
+              << std::endl;
+    return r;
+  }
+  pc.finish();
+  return 0;
+}
+
+void get_prepare_arguments(po::options_description *positional,
+                           po::options_description *options) {
+  options->add_options()
+    ("import-only", po::bool_switch(), "only import data from source")
+    ("source-spec-path", po::value<std::string>(),
+     "source-spec file (or '-' for stdin)")
+    ("source-spec", po::value<std::string>(),
+     "source-spec");
+  at::add_image_or_snap_spec_options(positional, options,
+                                     at::ARGUMENT_MODIFIER_SOURCE);
+  at::add_image_spec_options(positional, options, at::ARGUMENT_MODIFIER_DEST);
+  at::add_create_image_options(options, true);
+  at::add_flatten_option(options);
+}
+
+int execute_prepare(const po::variables_map &vm,
+                    const std::vector<std::string> &ceph_global_init_args) {
+  bool import_only = vm["import-only"].as<bool>();
+
+  size_t arg_index = 0;
+  std::string pool_name;
+  std::string namespace_name;
+  std::string image_name;
+  std::string snap_name;
+  int r = utils::get_pool_image_snapshot_names(
+    vm, at::ARGUMENT_MODIFIER_SOURCE, &arg_index, &pool_name, &namespace_name,
+    &image_name, import_only ? &snap_name : nullptr, true,
+    import_only ? utils::SNAPSHOT_PRESENCE_PERMITTED :
+                  utils::SNAPSHOT_PRESENCE_NONE,
+    utils::SPEC_VALIDATION_NONE);
+  if (r < 0) {
+    return r;
+  }
+
+  std::string dst_pool_name;
+  std::string dst_namespace_name;
+  std::string dst_image_name;
+  r = utils::get_pool_image_snapshot_names(
+    vm, at::ARGUMENT_MODIFIER_DEST, &arg_index, &dst_pool_name,
+    &dst_namespace_name, &dst_image_name, nullptr, false,
+    utils::SNAPSHOT_PRESENCE_NONE, utils::SPEC_VALIDATION_FULL);
+  if (r < 0) {
+    return r;
+  }
+
+  std::string source_spec;
+  if (vm.count("source-spec") && vm.count("source-spec-path")) {
+    std::cerr << "rbd: cannot specify both source-spec and source-spec-path"
+              << std::endl;
+    return -EINVAL;
+  } else if (vm.count("source-spec-path")) {
+    std::string source_spec_path = vm["source-spec-path"].as<std::string>();
+
+    int fd = STDIN_FILENO;
+    if (source_spec_path != "-") {
+      fd = open(source_spec_path.c_str(), O_RDONLY);
+      if (fd < 0) {
+        r = -errno;
+        std::cerr << "rbd: error opening " << source_spec_path << std::endl;
+        return r;
+      }
+    }
+
+    source_spec.resize(4096);
+    r = safe_read(fd, source_spec.data(), source_spec.size() - 1);
+    if (fd != STDIN_FILENO) {
+      VOID_TEMP_FAILURE_RETRY(close(fd));
+    }
+
+    if (r >= 0) {
+      source_spec.resize(r);
+    } else {
+      std::cerr << "rbd: error reading source-spec file: " << cpp_strerror(r)
+                << std::endl;
+      return r;
+    }
+  } else if (vm.count("source-spec")) {
+    source_spec = vm["source-spec"].as<std::string>();
+  }
+
+  librados::Rados rados;
+  librados::IoCtx io_ctx;
+  r = utils::init(pool_name, namespace_name, &rados, &io_ctx);
+  if (r < 0) {
+    return r;
+  }
+
+  librados::IoCtx dst_io_ctx;
+  if (source_spec.empty()) {
+    utils::normalize_pool_name(&dst_pool_name);
+    r = utils::init_io_ctx(rados, dst_pool_name, dst_namespace_name,
+                           &dst_io_ctx);
+    if (r < 0) {
+      return r;
+    }
+  }
+
+  if (import_only && source_spec.empty()) {
+    if (snap_name.empty()) {
+      std::cerr << "rbd: snapshot name was not specified" << std::endl;
+      return -EINVAL;
+    }
+
+    std::stringstream ss;
+    ss << R"({)"
+       << R"("type":"native",)"
+       << R"("pool_id":)" << io_ctx.get_id() << R"(,)"
+       << R"("pool_namespace":")" << io_ctx.get_namespace() << R"(",)"
+       << R"("image_name":")" << image_name << R"(",)"
+       << R"("snap_name":")" << snap_name << R"(")"
+       << R"(})";
+    source_spec = ss.str();
+
+    if (dst_image_name.empty()) {
+      std::cerr << "rbd: destination image name must be provided" << std::endl;
+      return -EINVAL;
+    }
+    io_ctx = dst_io_ctx;
+    image_name = dst_image_name;
+    snap_name = "";
+  } else if (!import_only && !source_spec.empty()) {
+    std::cerr << "rbd: --import-only must be used in combination with "
+              << "source-spec/source-spec-path" << std::endl;
+    return -EINVAL;
+  }
+
+  if (!snap_name.empty()) {
+    std::cerr << "rbd: snapshot name specified for a command that doesn't "
+              << "use it" << std::endl;
+    return -EINVAL;
+  }
+
+  librbd::ImageOptions opts;
+  r = utils::get_image_options(vm, true, &opts);
+  if (r < 0) {
+    return r;
+  }
+
+  if (source_spec.empty()) {
+    if (dst_image_name.empty()) {
+      dst_image_name = image_name;
+    }
+
+    int r = librbd::RBD().migration_prepare(io_ctx, image_name.c_str(),
+                                            dst_io_ctx, dst_image_name.c_str(),
+                                            opts);
+    if (r < 0) {
+      std::cerr << "rbd: preparing migration failed: " << cpp_strerror(r)
+                << std::endl;
+      return r;
+    }
+  } else {
+    ceph_assert(import_only);
+    r = librbd::RBD().migration_prepare_import(source_spec.c_str(), io_ctx,
+                                               image_name.c_str(), opts);
+    if (r < 0) {
+      std::cerr << "rbd: preparing import migration failed: " << cpp_strerror(r)
+                << std::endl;
+      return r;
+    }
+  }
+
+  return 0;
+}
+
+void get_execute_arguments(po::options_description *positional,
+                           po::options_description *options) {
+  at::add_image_spec_options(positional, options, at::ARGUMENT_MODIFIER_NONE);
+  at::add_no_progress_option(options);
+}
+
+int execute_execute(const po::variables_map &vm,
+                    const std::vector<std::string> &ceph_global_init_args) {
+  size_t arg_index = 0;
+  std::string pool_name;
+  std::string namespace_name;
+  std::string image_name;
+  int r = utils::get_pool_image_snapshot_names(
+    vm, at::ARGUMENT_MODIFIER_NONE, &arg_index, &pool_name, &namespace_name,
+    &image_name, nullptr, true, utils::SNAPSHOT_PRESENCE_NONE,
+    utils::SPEC_VALIDATION_NONE);
+  if (r < 0) {
+    return r;
+  }
+
+  librados::Rados rados;
+  librados::IoCtx io_ctx;
+  r = utils::init(pool_name, namespace_name, &rados, &io_ctx);
+  if (r < 0) {
+    return r;
+  }
+  io_ctx.set_pool_full_try();
+
+  r = do_execute(io_ctx, image_name, vm[at::NO_PROGRESS].as<bool>());
+  if (r < 0) {
+    return r;
+  }
+
+  return 0;
+}
+
+void get_abort_arguments(po::options_description *positional,
+                          po::options_description *options) {
+  at::add_image_spec_options(positional, options, at::ARGUMENT_MODIFIER_NONE);
+  at::add_no_progress_option(options);
+}
+
+int execute_abort(const po::variables_map &vm,
+                  const std::vector<std::string> &ceph_global_init_args) {
+  size_t arg_index = 0;
+  std::string pool_name;
+  std::string namespace_name;
+  std::string image_name;
+  int r = utils::get_pool_image_snapshot_names(
+    vm, at::ARGUMENT_MODIFIER_NONE, &arg_index, &pool_name, &namespace_name,
+    &image_name, nullptr, true, utils::SNAPSHOT_PRESENCE_NONE,
+    utils::SPEC_VALIDATION_NONE);
+  if (r < 0) {
+    return r;
+  }
+
+  librados::Rados rados;
+  librados::IoCtx io_ctx;
+  r = utils::init(pool_name, namespace_name, &rados, &io_ctx);
+  if (r < 0) {
+    return r;
+  }
+  io_ctx.set_pool_full_try();
+
+  r = do_abort(io_ctx, image_name, vm[at::NO_PROGRESS].as<bool>());
+  if (r < 0) {
+    return r;
+  }
+
+  return 0;
+}
+
+void get_commit_arguments(po::options_description *positional,
+                          po::options_description *options) {
+  at::add_image_spec_options(positional, options, at::ARGUMENT_MODIFIER_NONE);
+  at::add_no_progress_option(options);
+  options->add_options()
+      ("force", po::bool_switch(), "proceed even if the image has children");
+}
+
+int execute_commit(const po::variables_map &vm,
+                   const std::vector<std::string> &ceph_global_init_args) {
+  size_t arg_index = 0;
+  std::string pool_name;
+  std::string namespace_name;
+  std::string image_name;
+  int r = utils::get_pool_image_snapshot_names(
+    vm, at::ARGUMENT_MODIFIER_NONE, &arg_index, &pool_name, &namespace_name,
+    &image_name, nullptr, true, utils::SNAPSHOT_PRESENCE_NONE,
+    utils::SPEC_VALIDATION_NONE);
+  if (r < 0) {
+    return r;
+  }
+
+  librados::Rados rados;
+  librados::IoCtx io_ctx;
+  r = utils::init(pool_name, namespace_name, &rados, &io_ctx);
+  if (r < 0) {
+    return r;
+  }
+  io_ctx.set_pool_full_try();
+
+  r = do_commit(io_ctx, image_name, vm["force"].as<bool>(),
+                vm[at::NO_PROGRESS].as<bool>());
+  if (r < 0) {
+    return r;
+  }
+
+  return 0;
+}
+
+Shell::SwitchArguments switched_arguments({"import-only"});
+
+Shell::Action action_prepare(
+  {"migration", "prepare"}, {}, "Prepare image migration.",
+  at::get_long_features_help(), &get_prepare_arguments, &execute_prepare);
+
+Shell::Action action_execute(
+  {"migration", "execute"}, {}, "Execute image migration.", "",
+  &get_execute_arguments, &execute_execute);
+
+Shell::Action action_abort(
+  {"migration", "abort"}, {}, "Cancel interrupted image migration.", "",
+  &get_abort_arguments, &execute_abort);
+
+Shell::Action action_commit(
+  {"migration", "commit"}, {}, "Commit image migration.", "",
+  &get_commit_arguments, &execute_commit);
+
+} // namespace migration
+} // namespace action
+} // namespace rbd