1 files changed, 167 insertions, 0 deletions
diff --git a/src/tools/rbd/action/Children.cc b/src/tools/rbd/action/Children.cc
new file mode 100644
index 000000000..58e861b69
--- /dev/null
+++ b/src/tools/rbd/action/Children.cc
@@ -0,0 +1,167 @@
+// -*- 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 <iostream>
+#include <boost/program_options.hpp>
+
+namespace rbd {
+namespace action {
+namespace children {
+
+namespace at = argument_types;
+namespace po = boost::program_options;
+
+int do_list_children(librados::IoCtx &io_ctx, librbd::Image &image,
+                     bool all_flag, bool descendants_flag, Formatter *f)
+{
+  std::vector<librbd::linked_image_spec_t> children;
+  librbd::RBD rbd;
+  int r;
+  if (descendants_flag) {
+    r = image.list_descendants(&children);
+  } else {
+    r = image.list_children3(&children);
+  }
+  if (r < 0)
+    return r;
+
+  if (f)
+    f->open_array_section("children");
+
+  for (auto& child : children) {
+    bool trash = child.trash;
+    if (f) {
+      if (all_flag) {
+        f->open_object_section("child");
+        f->dump_string("pool", child.pool_name);
+        f->dump_string("pool_namespace", child.pool_namespace);
+        f->dump_string("image", child.image_name);
+        f->dump_string("id", child.image_id);
+        f->dump_bool("trash", child.trash);
+        f->close_section();
+      } else if (!trash) {
+        f->open_object_section("child");
+        f->dump_string("pool", child.pool_name);
+        f->dump_string("pool_namespace", child.pool_namespace);
+        f->dump_string("image", child.image_name);
+        f->close_section();
+      }
+    } else if (all_flag || !trash) {
+      if (child.pool_name.empty()) {
+        std::cout << "(child missing " << child.pool_id << "/";
+      } else {
+        std::cout << child.pool_name << "/";
+      }
+      if (!child.pool_namespace.empty()) {
+        std::cout << child.pool_namespace << "/";
+      }
+      if (child.image_name.empty()) {
+        std::cout << child.image_id << ")";
+      } else {
+        std::cout << child.image_name;
+        if (trash) {
+          std::cout << " (trash " << child.image_id << ")";
+	}
+      }
+      std::cout << std::endl;
+    }
+  }
+
+  if (f) {
+    f->close_section();
+    f->flush(std::cout);
+  }
+
+  return 0;
+}
+
+void get_arguments(po::options_description *positional,
+                   po::options_description *options) {
+  at::add_image_or_snap_spec_options(positional, options,
+                                     at::ARGUMENT_MODIFIER_NONE);
+  at::add_snap_id_option(options);
+  options->add_options()
+    ("all,a", po::bool_switch(), "list all children (include trash)");
+  options->add_options()
+    ("descendants", po::bool_switch(), "include all descendants");
+  at::add_format_options(options);
+}
+
+int execute(const po::variables_map &vm,
+            const std::vector<std::string> &ceph_global_init_args) {
+  uint64_t snap_id = LIBRADOS_SNAP_HEAD;
+  if (vm.count(at::SNAPSHOT_ID)) {
+    snap_id = vm[at::SNAPSHOT_ID].as<uint64_t>();
+  }
+
+  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_NONE, &arg_index, &pool_name, &namespace_name,
+    &image_name, &snap_name, true, utils::SNAPSHOT_PRESENCE_PERMITTED,
+    utils::SPEC_VALIDATION_NONE);
+  if (r < 0) {
+    return r;
+  }
+
+  if (snap_id != LIBRADOS_SNAP_HEAD && !snap_name.empty()) {
+    std::cerr << "rbd: trying to access snapshot using both name and id."
+              << std::endl;
+    return -EINVAL;
+  }
+
+  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, namespace_name, image_name, "", "",
+                                 true, &rados, &io_ctx, &image);
+  if (r < 0) {
+    return r;
+  }
+
+  if (!snap_name.empty()) {
+    r = image.snap_set(snap_name.c_str());
+  } else if (snap_id != LIBRADOS_SNAP_HEAD) {
+    r = image.snap_set_by_id(snap_id);
+  }
+  if (r == -ENOENT) {
+    std::cerr << "rbd: snapshot does not exist." << std::endl;
+    return r;
+  } else if (r < 0) {
+    std::cerr << "rbd: error setting snapshot: " << cpp_strerror(r)
+              << std::endl;
+    return r;
+  }
+
+  r = do_list_children(io_ctx, image, vm["all"].as<bool>(),
+                       vm["descendants"].as<bool>(), formatter.get());
+  if (r < 0) {
+    std::cerr << "rbd: listing children failed: " << cpp_strerror(r)
+              << std::endl;
+    return r;
+  }
+  return 0;
+}
+
+Shell::SwitchArguments switched_arguments({"all", "a", "descendants"});
+Shell::Action action(
+  {"children"}, {}, "Display children of an image or its snapshot.", "",
+  &get_arguments, &execute);
+
+} // namespace children
+} // namespace action
+} // namespace rbd