ceph/src/tools/rbd/action/Clone.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "tools/rbd/ArgumentTypes.h"
   5 #include "tools/rbd/Shell.h"
   6 #include "tools/rbd/Utils.h"
   7 #include "common/errno.h"
   8 #include <iostream>
   9 #include <boost/program_options.hpp>
  10
  11 namespace rbd {
  12 namespace action {
  13 namespace clone {
  14
  15 namespace at = argument_types;
  16 namespace po = boost::program_options;
  17
  18 int do_clone(librbd::RBD &rbd, librados::IoCtx &p_ioctx,
  19              const char *p_name, const char *p_snapname,
  20              librados::IoCtx &c_ioctx, const char *c_name,
  21              librbd::ImageOptions& opts) {
  22   return rbd.clone3(p_ioctx, p_name, p_snapname, c_ioctx, c_name, opts);
  23 }
  24
  25 void get_arguments(po::options_description *positional,
  26                    po::options_description *options) {
  27   at::add_snap_spec_options(positional, options, at::ARGUMENT_MODIFIER_SOURCE);
  28   at::add_image_spec_options(positional, options, at::ARGUMENT_MODIFIER_DEST);
  29   at::add_create_image_options(options, false);
  30 }
  31
  32 int execute(const po::variables_map &vm,
  33             const std::vector<std::string> &ceph_global_init_args) {
  34   size_t arg_index = 0;
  35   std::string pool_name;
  36   std::string namespace_name;
  37   std::string image_name;
  38   std::string snap_name;
  39   int r = utils::get_pool_image_snapshot_names(
  40     vm, at::ARGUMENT_MODIFIER_SOURCE, &arg_index, &pool_name, &namespace_name,
  41     &image_name, &snap_name, true, utils::SNAPSHOT_PRESENCE_REQUIRED,
  42     utils::SPEC_VALIDATION_NONE);
  43   if (r < 0) {
  44     return r;
  45   }
  46
  47   std::string dst_pool_name;
  48   std::string dst_namespace_name;
  49   std::string dst_image_name;
  50   std::string dst_snap_name;
  51   r = utils::get_pool_image_snapshot_names(
  52     vm, at::ARGUMENT_MODIFIER_DEST, &arg_index, &dst_pool_name,
  53     &dst_namespace_name, &dst_image_name, &dst_snap_name, true,
  54     utils::SNAPSHOT_PRESENCE_NONE, utils::SPEC_VALIDATION_FULL);
  55   if (r < 0) {
  56     return r;
  57   }
  58
  59   librbd::ImageOptions opts;
  60   r = utils::get_image_options(vm, false, &opts);
  61   if (r < 0) {
  62     return r;
  63   }
  64   opts.set(RBD_IMAGE_OPTION_FORMAT, static_cast<uint64_t>(2));
  65
  66   librados::Rados rados;
  67   librados::IoCtx io_ctx;
  68   r = utils::init(pool_name, namespace_name, &rados, &io_ctx);
  69   if (r < 0) {
  70     return r;
  71   }
  72
  73   librados::IoCtx dst_io_ctx;
  74   r = utils::init_io_ctx(rados, dst_pool_name, dst_namespace_name, &dst_io_ctx);
  75   if (r < 0) {
  76     return r;
  77   }
  78
  79   librbd::RBD rbd;
  80   r = do_clone(rbd, io_ctx, image_name.c_str(), snap_name.c_str(), dst_io_ctx,
  81                dst_image_name.c_str(), opts);
  82   if (r == -EXDEV) {
  83     std::cerr << "rbd: clone v2 required for cross-namespace clones."
  84               << std::endl;
  85     return r;
  86   } else if (r < 0) {
  87     std::cerr << "rbd: clone error: " << cpp_strerror(r) << std::endl;
  88     return r;
  89   }
  90   return 0;
  91 }
  92
  93 Shell::Action action(
  94   {"clone"}, {}, "Clone a snapshot into a CoW child image.",
  95   at::get_long_features_help(), &get_arguments, &execute);
  96
  97 } // namespace clone
  98 } // namespace action
  99 } // namespace rbd