ceph/src/librbd/api/Image.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 "librbd/api/Image.h"
   5 #include "include/rados/librados.hpp"
   6 #include "common/dout.h"
   7 #include "common/errno.h"
   8 #include "common/Cond.h"
   9 #include "cls/rbd/cls_rbd_client.h"
  10 #include "librbd/AsioEngine.h"
  11 #include "librbd/DeepCopyRequest.h"
  12 #include "librbd/ExclusiveLock.h"
  13 #include "librbd/ImageCtx.h"
  14 #include "librbd/ImageState.h"
  15 #include "librbd/internal.h"
  16 #include "librbd/Operations.h"
  17 #include "librbd/Utils.h"
  18 #include "librbd/api/Config.h"
  19 #include "librbd/api/Trash.h"
  20 #include "librbd/api/Utils.h"
  21 #include "librbd/crypto/FormatRequest.h"
  22 #include "librbd/crypto/LoadRequest.h"
  23 #include "librbd/deep_copy/Handler.h"
  24 #include "librbd/image/CloneRequest.h"
  25 #include "librbd/image/RemoveRequest.h"
  26 #include "librbd/image/PreRemoveRequest.h"
  27 #include "librbd/io/ImageDispatcherInterface.h"
  28 #include "librbd/io/ObjectDispatcherInterface.h"
  29 #include "librbd/io/AioCompletion.h"
  30 #include "librbd/io/ImageDispatchSpec.h"
  31 #include <boost/scope_exit.hpp>
  32
  33 #define dout_subsys ceph_subsys_rbd
  34 #undef dout_prefix
  35 #define dout_prefix *_dout << "librbd::api::Image: " << __func__ << ": "
  36
  37 using std::map;
  38 using std::string;
  39 using librados::snap_t;
  40
  41 namespace librbd {
  42 namespace api {
  43
  44 namespace {
  45
  46 bool compare_by_pool(const librbd::linked_image_spec_t& lhs,
  47                      const librbd::linked_image_spec_t& rhs)
  48 {
  49   if (lhs.pool_id != rhs.pool_id) {
  50     return lhs.pool_id < rhs.pool_id;
  51   } else if (lhs.pool_namespace != rhs.pool_namespace) {
  52     return lhs.pool_namespace < rhs.pool_namespace;
  53   }
  54   return false;
  55 }
  56
  57 bool compare(const librbd::linked_image_spec_t& lhs,
  58              const librbd::linked_image_spec_t& rhs)
  59 {
  60   if (lhs.pool_name != rhs.pool_name) {
  61     return lhs.pool_name < rhs.pool_name;
  62   } else if (lhs.pool_id != rhs.pool_id) {
  63     return lhs.pool_id < rhs.pool_id;
  64   } else if (lhs.pool_namespace != rhs.pool_namespace) {
  65     return lhs.pool_namespace < rhs.pool_namespace;
  66   } else if (lhs.image_name != rhs.image_name) {
  67     return lhs.image_name < rhs.image_name;
  68   } else if (lhs.image_id != rhs.image_id) {
  69     return lhs.image_id < rhs.image_id;
  70   }
  71   return false;
  72 }
  73
  74 template <typename I>
  75 int pre_remove_image(librados::IoCtx& io_ctx, const std::string& image_id) {
  76   I *image_ctx = I::create("", image_id, nullptr, io_ctx, false);
  77   int r = image_ctx->state->open(OPEN_FLAG_SKIP_OPEN_PARENT);
  78   if (r < 0) {
  79     return r;
  80   }
  81
  82   C_SaferCond ctx;
  83   auto req = image::PreRemoveRequest<I>::create(image_ctx, false, &ctx);
  84   req->send();
  85
  86   r = ctx.wait();
  87   image_ctx->state->close();
  88   return r;
  89 }
  90
  91 } // anonymous namespace
  92
  93 template <typename I>
  94 int64_t Image<I>::get_data_pool_id(I *ictx) {
  95   if (ictx->data_ctx.is_valid()) {
  96     return ictx->data_ctx.get_id();
  97   }
  98
  99   int64_t pool_id;
 100   int r = cls_client::get_data_pool(&ictx->md_ctx, ictx->header_oid, &pool_id);
 101   if (r < 0) {
 102     CephContext *cct = ictx->cct;
 103     lderr(cct) << "error getting data pool ID: " << cpp_strerror(r) << dendl;
 104     return r;
 105   }
 106
 107   return pool_id;
 108 }
 109
 110 template <typename I>
 111 int Image<I>::get_op_features(I *ictx, uint64_t *op_features) {
 112   CephContext *cct = ictx->cct;
 113   ldout(cct, 20) << "image_ctx=" << ictx << dendl;
 114
 115   int r = ictx->state->refresh_if_required();
 116   if (r < 0) {
 117     return r;
 118   }
 119
 120   std::shared_lock image_locker{ictx->image_lock};
 121   *op_features = ictx->op_features;
 122   return 0;
 123 }
 124
 125 template <typename I>
 126 int Image<I>::list_images(librados::IoCtx& io_ctx,
 127                           std::vector<image_spec_t> *images) {
 128   CephContext *cct = (CephContext *)io_ctx.cct();
 129   ldout(cct, 20) << "list " << &io_ctx << dendl;
 130
 131   int r;
 132   images->clear();
 133
 134   if (io_ctx.get_namespace().empty()) {
 135     bufferlist bl;
 136     r = io_ctx.read(RBD_DIRECTORY, bl, 0, 0);
 137     if (r == -ENOENT) {
 138       return 0;
 139     } else if (r < 0) {
 140       lderr(cct) << "error listing v1 images: " << cpp_strerror(r) << dendl;
 141       return r;
 142     }
 143
 144     // V1 format images are in a tmap
 145     if (bl.length()) {
 146       auto p = bl.cbegin();
 147       bufferlist header;
 148       std::map<std::string, bufferlist> m;
 149       decode(header, p);
 150       decode(m, p);
 151       for (auto& it : m) {
 152         images->push_back({.id ="", .name = it.first});
 153       }
 154     }
 155   }
 156
 157   // V2 format images
 158   std::map<std::string, std::string> image_names_to_ids;
 159   r = list_images_v2(io_ctx, &image_names_to_ids);
 160   if (r < 0) {
 161     lderr(cct) << "error listing v2 images: " << cpp_strerror(r) << dendl;
 162     return r;
 163   }
 164
 165   for (const auto& img_pair : image_names_to_ids) {
 166     images->push_back({.id = img_pair.second,
 167                        .name = img_pair.first});
 168   }
 169
 170   // include V2 images in a partially removed state
 171   std::vector<librbd::trash_image_info_t> trash_images;
 172   r = Trash<I>::list(io_ctx, trash_images, false);
 173   if (r < 0 && r != -EOPNOTSUPP) {
 174     lderr(cct) << "error listing trash images: " << cpp_strerror(r) << dendl;
 175     return r;
 176   }
 177
 178   for (const auto& trash_image : trash_images) {
 179     if (trash_image.source == RBD_TRASH_IMAGE_SOURCE_REMOVING) {
 180       images->push_back({.id = trash_image.id,
 181                          .name = trash_image.name});
 182
 183     }
 184   }
 185
 186   return 0;
 187 }
 188
 189 template <typename I>
 190 int Image<I>::list_images_v2(librados::IoCtx& io_ctx, ImageNameToIds *images) {
 191   CephContext *cct = (CephContext *)io_ctx.cct();
 192   ldout(cct, 20) << "io_ctx=" << &io_ctx << dendl;
 193
 194   // new format images are accessed by class methods
 195   int r;
 196   int max_read = 1024;
 197   string last_read = "";
 198   do {
 199     map<string, string> images_page;
 200     r = cls_client::dir_list(&io_ctx, RBD_DIRECTORY, last_read, max_read,
 201                              &images_page);
 202     if (r < 0 && r != -ENOENT) {
 203       lderr(cct) << "error listing image in directory: "
 204                  << cpp_strerror(r) << dendl;
 205       return r;
 206     } else if (r == -ENOENT) {
 207       break;
 208     }
 209     for (map<string, string>::const_iterator it = images_page.begin();
 210          it != images_page.end(); ++it) {
 211       images->insert(*it);
 212     }
 213     if (!images_page.empty()) {
 214       last_read = images_page.rbegin()->first;
 215     }
 216     r = images_page.size();
 217   } while (r == max_read);
 218
 219   return 0;
 220 }
 221
 222 template <typename I>
 223 int Image<I>::get_parent(I *ictx,
 224                          librbd::linked_image_spec_t *parent_image,
 225                          librbd::snap_spec_t *parent_snap) {
 226   auto cct = ictx->cct;
 227   ldout(cct, 20) << "image_ctx=" << ictx << dendl;
 228
 229   int r = ictx->state->refresh_if_required();
 230   if (r < 0) {
 231     return r;
 232   }
 233
 234   std::shared_lock image_locker{ictx->image_lock};
 235
 236   bool release_image_lock = false;
 237   BOOST_SCOPE_EXIT_ALL(ictx, &release_image_lock) {
 238     if (release_image_lock) {
 239       ictx->parent->image_lock.unlock_shared();
 240     }
 241   };
 242
 243   // if a migration is in-progress, the true parent is the parent
 244   // of the migration source image
 245   auto parent = ictx->parent;
 246   if (!ictx->migration_info.empty() && ictx->parent != nullptr) {
 247     release_image_lock = true;
 248     ictx->parent->image_lock.lock_shared();
 249
 250     parent = ictx->parent->parent;
 251   }
 252
 253   if (parent == nullptr) {
 254     return -ENOENT;
 255   }
 256
 257   parent_image->pool_id = parent->md_ctx.get_id();
 258   parent_image->pool_name = parent->md_ctx.get_pool_name();
 259   parent_image->pool_namespace = parent->md_ctx.get_namespace();
 260
 261   std::shared_lock parent_image_locker{parent->image_lock};
 262   parent_snap->id = parent->snap_id;
 263   parent_snap->namespace_type = RBD_SNAP_NAMESPACE_TYPE_USER;
 264   if (parent->snap_id != CEPH_NOSNAP) {
 265     auto snap_info = parent->get_snap_info(parent->snap_id);
 266     if (snap_info == nullptr) {
 267       lderr(cct) << "error finding parent snap name: " << cpp_strerror(r)
 268                  << dendl;
 269       return -ENOENT;
 270     }
 271
 272     parent_snap->namespace_type = static_cast<snap_namespace_type_t>(
 273       cls::rbd::get_snap_namespace_type(snap_info->snap_namespace));
 274     parent_snap->name = snap_info->name;
 275   }
 276
 277   parent_image->image_id = parent->id;
 278   parent_image->image_name = parent->name;
 279   parent_image->trash = true;
 280
 281   librbd::trash_image_info_t trash_info;
 282   r = Trash<I>::get(parent->md_ctx, parent->id, &trash_info);
 283   if (r == -ENOENT || r == -EOPNOTSUPP) {
 284     parent_image->trash = false;
 285   } else if (r < 0) {
 286     lderr(cct) << "error looking up trash status: " << cpp_strerror(r)
 287                << dendl;
 288     return r;
 289   }
 290
 291   return 0;
 292 }
 293
 294 template <typename I>
 295 int Image<I>::list_children(I *ictx,
 296                             std::vector<librbd::linked_image_spec_t> *images) {
 297   images->clear();
 298   return list_descendants(ictx, 1, images);
 299 }
 300
 301 template <typename I>
 302 int Image<I>::list_children(I *ictx,
 303                             const cls::rbd::ParentImageSpec &parent_spec,
 304                             std::vector<librbd::linked_image_spec_t> *images) {
 305   images->clear();
 306   return list_descendants(ictx, parent_spec, 1, images);
 307 }
 308
 309 template <typename I>
 310 int Image<I>::list_descendants(
 311     librados::IoCtx& io_ctx, const std::string &image_id,
 312     const std::optional<size_t> &max_level,
 313     std::vector<librbd::linked_image_spec_t> *images) {
 314   ImageCtx *ictx = new librbd::ImageCtx("", image_id, nullptr,
 315                                         io_ctx, true);
 316   CephContext *cct = ictx->cct;
 317   int r = ictx->state->open(OPEN_FLAG_SKIP_OPEN_PARENT);
 318   if (r < 0) {
 319     if (r == -ENOENT) {
 320       return 0;
 321     }
 322     lderr(cct) << "failed to open descendant " << image_id
 323                << " from pool " << io_ctx.get_pool_name() << ":"
 324                << cpp_strerror(r) << dendl;
 325     return r;
 326   }
 327
 328   r = list_descendants(ictx, max_level, images);
 329
 330   int r1 = ictx->state->close();
 331   if (r1 < 0) {
 332     lderr(cct) << "error when closing descendant " << image_id
 333                << " from pool " << io_ctx.get_pool_name() << ":"
 334                << cpp_strerror(r1) << dendl;
 335   }
 336
 337   return r;
 338 }
 339
 340 template <typename I>
 341 int Image<I>::list_descendants(
 342     I *ictx, const std::optional<size_t> &max_level,
 343     std::vector<librbd::linked_image_spec_t> *images) {
 344   std::shared_lock l{ictx->image_lock};
 345   std::vector<librados::snap_t> snap_ids;
 346   if (ictx->snap_id != CEPH_NOSNAP) {
 347     snap_ids.push_back(ictx->snap_id);
 348   } else {
 349     snap_ids = ictx->snaps;
 350   }
 351   for (auto snap_id : snap_ids) {
 352     cls::rbd::ParentImageSpec parent_spec{ictx->md_ctx.get_id(),
 353                                           ictx->md_ctx.get_namespace(),
 354                                           ictx->id, snap_id};
 355     int r = list_descendants(ictx, parent_spec, max_level, images);
 356     if (r < 0) {
 357       return r;
 358     }
 359   }
 360   return 0;
 361 }
 362
 363 template <typename I>
 364 int Image<I>::list_descendants(
 365     I *ictx, const cls::rbd::ParentImageSpec &parent_spec,
 366     const std::optional<size_t> &max_level,
 367     std::vector<librbd::linked_image_spec_t> *images) {
 368   auto child_max_level = max_level;
 369   if (child_max_level) {
 370     if (child_max_level == 0) {
 371       return 0;
 372     }
 373     (*child_max_level)--;
 374   }
 375   CephContext *cct = ictx->cct;
 376   ldout(cct, 20) << "ictx=" << ictx << dendl;
 377
 378   // no children for non-layered or old format image
 379   if (!ictx->test_features(RBD_FEATURE_LAYERING, ictx->image_lock)) {
 380     return 0;
 381   }
 382
 383   librados::Rados rados(ictx->md_ctx);
 384
 385   // search all pools for clone v1 children dependent on this snapshot
 386   std::list<std::pair<int64_t, std::string> > pools;
 387   int r = rados.pool_list2(pools);
 388   if (r < 0) {
 389     lderr(cct) << "error listing pools: " << cpp_strerror(r) << dendl;
 390     return r;
 391   }
 392
 393   for (auto& it : pools) {
 394     int64_t base_tier;
 395     r = rados.pool_get_base_tier(it.first, &base_tier);
 396     if (r == -ENOENT) {
 397       ldout(cct, 1) << "pool " << it.second << " no longer exists" << dendl;
 398       continue;
 399     } else if (r < 0) {
 400       lderr(cct) << "error retrieving base tier for pool " << it.second
 401                  << dendl;
 402       return r;
 403     }
 404     if (it.first != base_tier) {
 405       // pool is a cache; skip it
 406       continue;
 407     }
 408
 409     IoCtx ioctx;
 410     r = librbd::util::create_ioctx(
 411             ictx->md_ctx, "child image", it.first, {}, &ioctx);
 412     if (r == -ENOENT) {
 413       continue;
 414     } else if (r < 0) {
 415       return r;
 416     }
 417
 418     std::set<std::string> image_ids;
 419     r = cls_client::get_children(&ioctx, RBD_CHILDREN, parent_spec,
 420                                  image_ids);
 421     if (r < 0 && r != -ENOENT) {
 422       lderr(cct) << "error reading list of children from pool " << it.second
 423                  << dendl;
 424       return r;
 425     }
 426
 427     for (auto& image_id : image_ids) {
 428       images->push_back({
 429         it.first, "", ictx->md_ctx.get_namespace(), image_id, "", false});
 430       r = list_descendants(ioctx, image_id, child_max_level, images);
 431       if (r < 0) {
 432         return r;
 433       }
 434     }
 435   }
 436
 437   // retrieve clone v2 children attached to this snapshot
 438   IoCtx parent_io_ctx;
 439   r = librbd::util::create_ioctx(
 440           ictx->md_ctx, "parent image",parent_spec.pool_id,
 441           parent_spec.pool_namespace, &parent_io_ctx);
 442   if (r < 0) {
 443     return r;
 444   }
 445
 446   cls::rbd::ChildImageSpecs child_images;
 447   r = cls_client::children_list(
 448           &parent_io_ctx, librbd::util::header_name(parent_spec.image_id),
 449           parent_spec.snap_id, &child_images);
 450   if (r < 0 && r != -ENOENT && r != -EOPNOTSUPP) {
 451     lderr(cct) << "error retrieving children: " << cpp_strerror(r) << dendl;
 452     return r;
 453   }
 454
 455   for (auto& child_image : child_images) {
 456     images->push_back({
 457       child_image.pool_id, "", child_image.pool_namespace,
 458       child_image.image_id, "", false});
 459     if (!child_max_level || *child_max_level > 0) {
 460       IoCtx ioctx;
 461       r = librbd::util::create_ioctx(
 462               ictx->md_ctx, "child image", child_image.pool_id,
 463               child_image.pool_namespace, &ioctx);
 464       if (r == -ENOENT) {
 465         continue;
 466       } else if (r < 0) {
 467         return r;
 468       }
 469       r = list_descendants(ioctx, child_image.image_id, child_max_level,
 470                            images);
 471       if (r < 0) {
 472         return r;
 473       }
 474     }
 475   }
 476
 477   // batch lookups by pool + namespace
 478   std::sort(images->begin(), images->end(), compare_by_pool);
 479
 480   int64_t child_pool_id = -1;
 481   librados::IoCtx child_io_ctx;
 482   std::map<std::string, std::pair<std::string, bool>> child_image_id_to_info;
 483   for (auto& image : *images) {
 484     if (child_pool_id == -1 || child_pool_id != image.pool_id ||
 485         child_io_ctx.get_namespace() != image.pool_namespace) {
 486       r = librbd::util::create_ioctx(
 487               ictx->md_ctx, "child image", image.pool_id, image.pool_namespace,
 488               &child_io_ctx);
 489       if (r == -ENOENT) {
 490         image.pool_name = "";
 491         image.image_name = "";
 492         continue;
 493       } else if (r < 0) {
 494         return r;
 495       }
 496       child_pool_id = image.pool_id;
 497
 498       child_image_id_to_info.clear();
 499
 500       std::map<std::string, std::string> image_names_to_ids;
 501       r = list_images_v2(child_io_ctx, &image_names_to_ids);
 502       if (r < 0) {
 503         lderr(cct) << "error listing v2 images: " << cpp_strerror(r) << dendl;
 504         return r;
 505       }
 506
 507       for (auto& [name, id] : image_names_to_ids) {
 508         child_image_id_to_info.insert({id, {name, false}});
 509       }
 510
 511       std::vector<librbd::trash_image_info_t> trash_images;
 512       r = Trash<I>::list(child_io_ctx, trash_images, false);
 513       if (r < 0 && r != -EOPNOTSUPP) {
 514         lderr(cct) << "error listing trash images: " << cpp_strerror(r)
 515                    << dendl;
 516         return r;
 517       }
 518
 519       for (auto& it : trash_images) {
 520         child_image_id_to_info.insert({
 521           it.id,
 522           {it.name,
 523            it.source == RBD_TRASH_IMAGE_SOURCE_REMOVING ? false : true}});
 524       }
 525     }
 526
 527     auto it = child_image_id_to_info.find(image.image_id);
 528     if (it == child_image_id_to_info.end()) {
 529           lderr(cct) << "error looking up name for image id "
 530                      << image.image_id << " in pool "
 531                      << child_io_ctx.get_pool_name()
 532                      << (image.pool_namespace.empty() ?
 533                           "" : "/" + image.pool_namespace) << dendl;
 534       return -ENOENT;
 535     }
 536
 537     image.pool_name = child_io_ctx.get_pool_name();
 538     image.image_name = it->second.first;
 539     image.trash = it->second.second;
 540   }
 541
 542   // final sort by pool + image names
 543   std::sort(images->begin(), images->end(), compare);
 544   return 0;
 545 }
 546
 547 template <typename I>
 548 int Image<I>::deep_copy(I *src, librados::IoCtx& dest_md_ctx,
 549                         const char *destname, ImageOptions& opts,
 550                         ProgressContext &prog_ctx) {
 551   CephContext *cct = (CephContext *)dest_md_ctx.cct();
 552   ldout(cct, 20) << src->name
 553                  << (src->snap_name.length() ? "@" + src->snap_name : "")
 554                  << " -> " << destname << " opts = " << opts << dendl;
 555
 556   uint64_t features;
 557   uint64_t src_size;
 558   {
 559     std::shared_lock image_locker{src->image_lock};
 560
 561     if (!src->migration_info.empty()) {
 562       lderr(cct) << "cannot deep copy migrating image" << dendl;
 563       return -EBUSY;
 564     }
 565
 566     features = src->features;
 567     src_size = src->get_image_size(src->snap_id);
 568   }
 569   uint64_t format = 2;
 570   if (opts.get(RBD_IMAGE_OPTION_FORMAT, &format) != 0) {
 571     opts.set(RBD_IMAGE_OPTION_FORMAT, format);
 572   }
 573   if (format == 1) {
 574     lderr(cct) << "old format not supported for destination image" << dendl;
 575     return -EINVAL;
 576   }
 577   uint64_t stripe_unit = src->stripe_unit;
 578   if (opts.get(RBD_IMAGE_OPTION_STRIPE_UNIT, &stripe_unit) != 0) {
 579     opts.set(RBD_IMAGE_OPTION_STRIPE_UNIT, stripe_unit);
 580   }
 581   uint64_t stripe_count = src->stripe_count;
 582   if (opts.get(RBD_IMAGE_OPTION_STRIPE_COUNT, &stripe_count) != 0) {
 583     opts.set(RBD_IMAGE_OPTION_STRIPE_COUNT, stripe_count);
 584   }
 585   uint64_t order = src->order;
 586   if (opts.get(RBD_IMAGE_OPTION_ORDER, &order) != 0) {
 587     opts.set(RBD_IMAGE_OPTION_ORDER, order);
 588   }
 589   if (opts.get(RBD_IMAGE_OPTION_FEATURES, &features) != 0) {
 590     opts.set(RBD_IMAGE_OPTION_FEATURES, features);
 591   }
 592   if (features & ~RBD_FEATURES_ALL) {
 593     lderr(cct) << "librbd does not support requested features" << dendl;
 594     return -ENOSYS;
 595   }
 596
 597   uint64_t flatten = 0;
 598   if (opts.get(RBD_IMAGE_OPTION_FLATTEN, &flatten) == 0) {
 599     opts.unset(RBD_IMAGE_OPTION_FLATTEN);
 600   }
 601
 602   cls::rbd::ParentImageSpec parent_spec;
 603   if (flatten > 0) {
 604     parent_spec.pool_id = -1;
 605   } else {
 606     std::shared_lock image_locker{src->image_lock};
 607
 608     // use oldest snapshot or HEAD for parent spec
 609     if (!src->snap_info.empty()) {
 610       parent_spec = src->snap_info.begin()->second.parent.spec;
 611     } else {
 612       parent_spec = src->parent_md.spec;
 613     }
 614   }
 615
 616   int r;
 617   if (parent_spec.pool_id == -1) {
 618     r = create(dest_md_ctx, destname, "", src_size, opts, "", "", false);
 619   } else {
 620     librados::IoCtx parent_io_ctx;
 621     r = librbd::util::create_ioctx(
 622             src->md_ctx, "parent image", parent_spec.pool_id,
 623             parent_spec.pool_namespace, &parent_io_ctx);
 624     if (r < 0) {
 625       return r;
 626     }
 627
 628     ConfigProxy config{cct->_conf};
 629     api::Config<I>::apply_pool_overrides(dest_md_ctx, &config);
 630
 631     C_SaferCond ctx;
 632     std::string dest_id = librbd::util::generate_image_id(dest_md_ctx);
 633     auto *req = image::CloneRequest<I>::create(
 634       config, parent_io_ctx, parent_spec.image_id, "", {}, parent_spec.snap_id,
 635       dest_md_ctx, destname, dest_id, opts, cls::rbd::MIRROR_IMAGE_MODE_JOURNAL,
 636       "", "", src->op_work_queue, &ctx);
 637     req->send();
 638     r = ctx.wait();
 639   }
 640   if (r < 0) {
 641     lderr(cct) << "header creation failed" << dendl;
 642     return r;
 643   }
 644   opts.set(RBD_IMAGE_OPTION_ORDER, static_cast<uint64_t>(order));
 645
 646   auto dest = new I(destname, "", nullptr, dest_md_ctx, false);
 647   r = dest->state->open(0);
 648   if (r < 0) {
 649     lderr(cct) << "failed to read newly created header" << dendl;
 650     return r;
 651   }
 652
 653   C_SaferCond lock_ctx;
 654   {
 655     std::unique_lock locker{dest->owner_lock};
 656
 657     if (dest->exclusive_lock == nullptr ||
 658         dest->exclusive_lock->is_lock_owner()) {
 659       lock_ctx.complete(0);
 660     } else {
 661       dest->exclusive_lock->acquire_lock(&lock_ctx);
 662     }
 663   }
 664
 665   r = lock_ctx.wait();
 666   if (r < 0) {
 667     lderr(cct) << "failed to request exclusive lock: " << cpp_strerror(r)
 668                << dendl;
 669     dest->state->close();
 670     return r;
 671   }
 672
 673   r = deep_copy(src, dest, flatten > 0, prog_ctx);
 674
 675   int close_r = dest->state->close();
 676   if (r == 0 && close_r < 0) {
 677     r = close_r;
 678   }
 679   return r;
 680 }
 681
 682 template <typename I>
 683 int Image<I>::deep_copy(I *src, I *dest, bool flatten,
 684                         ProgressContext &prog_ctx) {
 685   // ensure previous writes are visible to dest
 686   C_SaferCond flush_ctx;
 687   {
 688     std::shared_lock owner_locker{src->owner_lock};
 689     auto aio_comp = io::AioCompletion::create_and_start(&flush_ctx, src,
 690                                                         io::AIO_TYPE_FLUSH);
 691     auto req = io::ImageDispatchSpec::create_flush(
 692       *src, io::IMAGE_DISPATCH_LAYER_INTERNAL_START,
 693       aio_comp, io::FLUSH_SOURCE_INTERNAL, {});
 694     req->send();
 695   }
 696   int r = flush_ctx.wait();
 697   if (r < 0) {
 698     return r;
 699   }
 700
 701   librados::snap_t snap_id_start = 0;
 702   librados::snap_t snap_id_end;
 703   {
 704     std::shared_lock image_locker{src->image_lock};
 705     snap_id_end = src->snap_id;
 706   }
 707
 708   AsioEngine asio_engine(src->md_ctx);
 709
 710   C_SaferCond cond;
 711   SnapSeqs snap_seqs;
 712   deep_copy::ProgressHandler progress_handler{&prog_ctx};
 713   auto req = DeepCopyRequest<I>::create(
 714     src, dest, snap_id_start, snap_id_end, 0U, flatten, boost::none,
 715     asio_engine.get_work_queue(), &snap_seqs, &progress_handler, &cond);
 716   req->send();
 717   r = cond.wait();
 718   if (r < 0) {
 719     return r;
 720   }
 721
 722   return 0;
 723 }
 724
 725 template <typename I>
 726 int Image<I>::snap_set(I *ictx,
 727                        const cls::rbd::SnapshotNamespace &snap_namespace,
 728                        const char *snap_name) {
 729   ldout(ictx->cct, 20) << "snap_set " << ictx << " snap = "
 730                        << (snap_name ? snap_name : "NULL") << dendl;
 731
 732   // ignore return value, since we may be set to a non-existent
 733   // snapshot and the user is trying to fix that
 734   ictx->state->refresh_if_required();
 735
 736   uint64_t snap_id = CEPH_NOSNAP;
 737   std::string name(snap_name == nullptr ? "" : snap_name);
 738   if (!name.empty()) {
 739     std::shared_lock image_locker{ictx->image_lock};
 740     snap_id = ictx->get_snap_id(cls::rbd::UserSnapshotNamespace{},
 741                                 snap_name);
 742     if (snap_id == CEPH_NOSNAP) {
 743       return -ENOENT;
 744     }
 745   }
 746
 747   return snap_set(ictx, snap_id);
 748 }
 749
 750 template <typename I>
 751 int Image<I>::snap_set(I *ictx, uint64_t snap_id) {
 752   ldout(ictx->cct, 20) << "snap_set " << ictx << " "
 753                        << "snap_id=" << snap_id << dendl;
 754
 755   // ignore return value, since we may be set to a non-existent
 756   // snapshot and the user is trying to fix that
 757   ictx->state->refresh_if_required();
 758
 759   C_SaferCond ctx;
 760   ictx->state->snap_set(snap_id, &ctx);
 761   int r = ctx.wait();
 762   if (r < 0) {
 763     if (r != -ENOENT) {
 764       lderr(ictx->cct) << "failed to " << (snap_id == CEPH_NOSNAP ? "un" : "")
 765                        << "set snapshot: " << cpp_strerror(r) << dendl;
 766     }
 767     return r;
 768   }
 769
 770   return 0;
 771 }
 772
 773 template <typename I>
 774 int Image<I>::remove(IoCtx& io_ctx, const std::string &image_name,
 775                      ProgressContext& prog_ctx)
 776 {
 777   CephContext *cct((CephContext *)io_ctx.cct());
 778   ldout(cct, 20) << "name=" << image_name << dendl;
 779
 780   // look up the V2 image id based on the image name
 781   std::string image_id;
 782   int r = cls_client::dir_get_id(&io_ctx, RBD_DIRECTORY, image_name,
 783                                  &image_id);
 784   if (r == -ENOENT) {
 785     // check if it already exists in trash from an aborted trash remove attempt
 786     std::vector<trash_image_info_t> trash_entries;
 787     r = Trash<I>::list(io_ctx, trash_entries, false);
 788     if (r < 0) {
 789       return r;
 790     } else if (r >= 0) {
 791       for (auto& entry : trash_entries) {
 792         if (entry.name == image_name &&
 793             entry.source == RBD_TRASH_IMAGE_SOURCE_REMOVING) {
 794           return Trash<I>::remove(io_ctx, entry.id, true, prog_ctx);
 795         }
 796       }
 797     }
 798
 799     // fall-through if we failed to locate the image in the V2 directory and
 800     // trash
 801   } else if (r < 0) {
 802     lderr(cct) << "failed to retrieve image id: " << cpp_strerror(r) << dendl;
 803     return r;
 804   } else {
 805     // attempt to move the image to the trash (and optionally immediately
 806     // delete the image)
 807     ConfigProxy config(cct->_conf);
 808     Config<I>::apply_pool_overrides(io_ctx, &config);
 809
 810     rbd_trash_image_source_t trash_image_source =
 811       RBD_TRASH_IMAGE_SOURCE_REMOVING;
 812     uint64_t expire_seconds = 0;
 813     if (config.get_val<bool>("rbd_move_to_trash_on_remove")) {
 814       // keep the image in the trash upon remove requests
 815       trash_image_source = RBD_TRASH_IMAGE_SOURCE_USER;
 816       expire_seconds = config.get_val<uint64_t>(
 817         "rbd_move_to_trash_on_remove_expire_seconds");
 818     } else {
 819       // attempt to pre-validate the removal before moving to trash and
 820       // removing
 821       r = pre_remove_image<I>(io_ctx, image_id);
 822       if (r == -ECHILD) {
 823         if (config.get_val<bool>("rbd_move_parent_to_trash_on_remove")) {
 824           // keep the image in the trash until the last child is removed
 825           trash_image_source = RBD_TRASH_IMAGE_SOURCE_USER_PARENT;
 826         } else {
 827           lderr(cct) << "image has snapshots - not removing" << dendl;
 828           return -ENOTEMPTY;
 829         }
 830       } else if (r < 0 && r != -ENOENT) {
 831         return r;
 832       }
 833     }
 834
 835     r = Trash<I>::move(io_ctx, trash_image_source, image_name, image_id,
 836                        expire_seconds);
 837     if (r >= 0) {
 838       if (trash_image_source == RBD_TRASH_IMAGE_SOURCE_REMOVING) {
 839         // proceed with attempting to immediately remove the image
 840         r = Trash<I>::remove(io_ctx, image_id, true, prog_ctx);
 841
 842         if (r == -ENOTEMPTY || r == -EBUSY || r == -EMLINK) {
 843           // best-effort try to restore the image if the removal
 844           // failed for possible expected reasons
 845           Trash<I>::restore(io_ctx, {cls::rbd::TRASH_IMAGE_SOURCE_REMOVING},
 846                             image_id, image_name);
 847         }
 848       }
 849       return r;
 850     } else if (r < 0 && r != -EOPNOTSUPP) {
 851       return r;
 852     }
 853
 854     // fall-through if trash isn't supported
 855   }
 856
 857   AsioEngine asio_engine(io_ctx);
 858
 859   // might be a V1 image format that cannot be moved to the trash
 860   // and would not have been listed in the V2 directory -- or the OSDs
 861   // are too old and don't support the trash feature
 862   C_SaferCond cond;
 863   auto req = librbd::image::RemoveRequest<I>::create(
 864     io_ctx, image_name, "", false, false, prog_ctx,
 865     asio_engine.get_work_queue(), &cond);
 866   req->send();
 867
 868   return cond.wait();
 869 }
 870
 871 template <typename I>
 872 int Image<I>::flatten_children(I *ictx, const char* snap_name,
 873                                ProgressContext& pctx) {
 874   CephContext *cct = ictx->cct;
 875   ldout(cct, 20) << "children flatten " << ictx->name << dendl;
 876
 877   int r = ictx->state->refresh_if_required();
 878   if (r < 0) {
 879     return r;
 880   }
 881
 882   std::shared_lock l{ictx->image_lock};
 883   snap_t snap_id = ictx->get_snap_id(cls::rbd::UserSnapshotNamespace(),
 884                                      snap_name);
 885
 886   cls::rbd::ParentImageSpec parent_spec{ictx->md_ctx.get_id(),
 887                                         ictx->md_ctx.get_namespace(),
 888                                         ictx->id, snap_id};
 889   std::vector<librbd::linked_image_spec_t> child_images;
 890   r = list_children(ictx, parent_spec, &child_images);
 891   if (r < 0) {
 892     return r;
 893   }
 894
 895   size_t size = child_images.size();
 896   if (size == 0) {
 897     return 0;
 898   }
 899
 900   librados::IoCtx child_io_ctx;
 901   int64_t child_pool_id = -1;
 902   size_t i = 0;
 903   for (auto &child_image : child_images){
 904     std::string pool = child_image.pool_name;
 905     if (child_pool_id == -1 ||
 906         child_pool_id != child_image.pool_id ||
 907         child_io_ctx.get_namespace() != child_image.pool_namespace) {
 908       r = librbd::util::create_ioctx(
 909               ictx->md_ctx, "child image", child_image.pool_id,
 910               child_image.pool_namespace, &child_io_ctx);
 911       if (r < 0) {
 912         return r;
 913       }
 914
 915       child_pool_id = child_image.pool_id;
 916     }
 917
 918     ImageCtx *imctx = new ImageCtx("", child_image.image_id, nullptr,
 919                                    child_io_ctx, false);
 920     r = imctx->state->open(0);
 921     if (r < 0) {
 922       lderr(cct) << "error opening image: " << cpp_strerror(r) << dendl;
 923       return r;
 924     }
 925
 926     if ((imctx->features & RBD_FEATURE_DEEP_FLATTEN) == 0 &&
 927         !imctx->snaps.empty()) {
 928       lderr(cct) << "snapshot in-use by " << pool << "/" << imctx->name
 929                  << dendl;
 930       imctx->state->close();
 931       return -EBUSY;
 932     }
 933
 934     librbd::NoOpProgressContext prog_ctx;
 935     r = imctx->operations->flatten(prog_ctx);
 936     if (r < 0) {
 937       lderr(cct) << "error flattening image: " << pool << "/"
 938                  << (child_image.pool_namespace.empty() ?
 939                       "" : "/" + child_image.pool_namespace)
 940                  << child_image.image_name << cpp_strerror(r) << dendl;
 941       imctx->state->close();
 942       return r;
 943     }
 944
 945     r = imctx->state->close();
 946     if (r < 0) {
 947       lderr(cct) << "failed to close image: " << cpp_strerror(r) << dendl;
 948       return r;
 949     }
 950
 951     pctx.update_progress(++i, size);
 952     ceph_assert(i <= size);
 953   }
 954
 955   return 0;
 956 }
 957
 958 template <typename I>
 959 int Image<I>::encryption_format(I* ictx, encryption_format_t format,
 960                                 encryption_options_t opts, size_t opts_size,
 961                                 bool c_api) {
 962   if (ictx->parent != nullptr) {
 963     lderr(ictx->cct) << "cannot format a cloned image" << dendl;
 964     return -ENOTSUP;
 965   }
 966
 967   crypto::EncryptionFormat<I>* result_format;
 968   auto r = util::create_encryption_format(
 969           ictx->cct, format, opts, opts_size, c_api, &result_format);
 970   if (r != 0) {
 971     return r;
 972   }
 973
 974   C_SaferCond cond;
 975   auto req = librbd::crypto::FormatRequest<I>::create(
 976           ictx, std::unique_ptr<crypto::EncryptionFormat<I>>(result_format),
 977           &cond);
 978   req->send();
 979   return cond.wait();
 980 }
 981
 982 template <typename I>
 983 int Image<I>::encryption_load(I* ictx, encryption_format_t format,
 984                               encryption_options_t opts, size_t opts_size,
 985                               bool c_api) {
 986   crypto::EncryptionFormat<I>* result_format;
 987   auto r = util::create_encryption_format(
 988           ictx->cct, format, opts, opts_size, c_api, &result_format);
 989   if (r != 0) {
 990     return r;
 991   }
 992
 993   C_SaferCond cond;
 994   auto req = librbd::crypto::LoadRequest<I>::create(
 995           ictx, std::unique_ptr<crypto::EncryptionFormat<I>>(result_format),
 996           &cond);
 997   req->send();
 998   return cond.wait();
 999 }
1000
1001 } // namespace api
1002 } // namespace librbd
1003
1004 template class librbd::api::Image<librbd::ImageCtx>;