1 files changed, 123 insertions, 0 deletions
diff --git a/src/tools/rbd/action/Resize.cc b/src/tools/rbd/action/Resize.cc
new file mode 100644
index 000000000..79fbbd127
--- /dev/null
+++ b/src/tools/rbd/action/Resize.cc
@@ -0,0 +1,123 @@
+// -*- 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 <iostream>
+#include <boost/program_options.hpp>
+
+namespace rbd {
+namespace action {
+namespace resize {
+
+namespace at = argument_types;
+namespace po = boost::program_options;
+
+static int do_resize(librbd::Image& image, uint64_t size, bool allow_shrink, bool no_progress)
+{
+  utils::ProgressContext pc("Resizing image", no_progress);
+  int r = image.resize2(size, allow_shrink, pc);
+  if (r < 0) {
+    pc.fail();
+    return r;
+  }
+  pc.finish();
+  return 0;
+}
+
+void get_arguments(po::options_description *positional,
+                   po::options_description *options) {
+  at::add_image_spec_options(positional, options, at::ARGUMENT_MODIFIER_NONE);
+  at::add_size_option(options);
+  options->add_options()
+    ("allow-shrink", po::bool_switch(), "permit shrinking");
+  at::add_no_progress_option(options);
+  at::add_encryption_options(options);
+}
+
+int 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;
+  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_NONE,
+    utils::SPEC_VALIDATION_NONE);
+  if (r < 0) {
+    return r;
+  }
+
+  uint64_t size;
+  r = utils::get_image_size(vm, &size);
+  if (r < 0) {
+    return r;
+  }
+
+  utils::EncryptionOptions encryption_options;
+  r = utils::get_encryption_options(vm, &encryption_options);
+  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, "",
+                                 snap_name, false, &rados, &io_ctx, &image);
+  if (r < 0) {
+    return r;
+  }
+
+  if (!encryption_options.specs.empty()) {
+    r = image.encryption_load2(encryption_options.specs.data(),
+                               encryption_options.specs.size());
+    if (r < 0) {
+      std::cerr << "rbd: encryption load failed: " << cpp_strerror(r)
+                << std::endl;
+      return r;
+    }
+  }
+
+  librbd::image_info_t info;
+  r = image.stat(info, sizeof(info));
+  if (r < 0) {
+    std::cerr << "rbd: resize error: " << cpp_strerror(r) << std::endl;
+    return r;
+  }
+
+  if (info.size == size) {
+    std::cerr << "rbd: new size is equal to original size " << std::endl;
+    return -EINVAL;
+  }
+
+  if (info.size > size && !vm["allow-shrink"].as<bool>()) {
+    r = -EINVAL;
+  } else {
+    r = do_resize(image, size, vm["allow-shrink"].as<bool>(), vm[at::NO_PROGRESS].as<bool>());
+  }
+
+  if (r < 0) {
+    if (r == -EINVAL && !vm["allow-shrink"].as<bool>()) {
+      std::cerr << "rbd: shrinking an image is only allowed with the "
+                << "--allow-shrink flag" << std::endl;
+      return r;
+    }
+    std::cerr << "rbd: resize error: " << cpp_strerror(r) << std::endl;
+    return r;
+  }
+  return 0;
+}
+
+Shell::SwitchArguments switched_arguments({"allow-shrink"});
+Shell::Action action(
+  {"resize"}, {}, "Resize (expand or shrink) image.", "", &get_arguments,
+  &execute);
+
+} // namespace resize
+} // namespace action
+} // namespace rbd