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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | ||
4 | #include "common/errno.h" | |
5 | ||
6 | #include "librbd/ExclusiveLock.h" | |
7 | #include "librbd/api/Group.h" | |
8 | #include "librbd/ImageCtx.h" | |
9 | #include "librbd/ImageState.h" | |
10 | #include "librbd/ImageWatcher.h" | |
11 | #include "librbd/Operations.h" | |
12 | #include "librbd/Utils.h" | |
13 | #include "librbd/io/AioCompletion.h" | |
14 | ||
15 | #define dout_subsys ceph_subsys_rbd | |
16 | #undef dout_prefix | |
17 | #define dout_prefix *_dout << "librbd::api::Group: " << __func__ << ": " | |
18 | ||
19 | using std::map; | |
20 | using std::pair; | |
21 | using std::set; | |
22 | using std::string; | |
23 | using std::vector; | |
24 | // list binds to list() here, so std::list is explicitly used below | |
25 | ||
26 | using ceph::bufferlist; | |
27 | using librados::snap_t; | |
28 | using librados::IoCtx; | |
29 | using librados::Rados; | |
30 | ||
31 | ||
32 | namespace librbd { | |
33 | namespace api { | |
34 | ||
35 | namespace { | |
36 | ||
37 | template <typename I> | |
38 | snap_t get_group_snap_id(I* ictx, | |
39 | const cls::rbd::SnapshotNamespace& in_snap_namespace) { | |
40 | ceph_assert(ictx->snap_lock.is_locked()); | |
41 | auto it = ictx->snap_ids.lower_bound({in_snap_namespace, ""}); | |
42 | if (it != ictx->snap_ids.end() && it->first.first == in_snap_namespace) { | |
43 | return it->second; | |
44 | } | |
45 | return CEPH_NOSNAP; | |
46 | } | |
47 | ||
48 | string generate_uuid(librados::IoCtx& io_ctx) | |
49 | { | |
50 | Rados rados(io_ctx); | |
51 | uint64_t bid = rados.get_instance_id(); | |
52 | ||
53 | uint32_t extra = rand() % 0xFFFFFFFF; | |
54 | ostringstream bid_ss; | |
55 | bid_ss << std::hex << bid << std::hex << extra; | |
56 | return bid_ss.str(); | |
57 | } | |
58 | ||
59 | int group_snap_list(librados::IoCtx& group_ioctx, const char *group_name, | |
60 | std::vector<cls::rbd::GroupSnapshot> *cls_snaps) | |
61 | { | |
62 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
63 | ||
64 | string group_id; | |
65 | vector<string> ind_snap_names; | |
66 | ||
67 | int r = cls_client::dir_get_id(&group_ioctx, RBD_GROUP_DIRECTORY, | |
68 | group_name, &group_id); | |
69 | if (r < 0) { | |
70 | lderr(cct) << "error reading group id object: " | |
71 | << cpp_strerror(r) | |
72 | << dendl; | |
73 | return r; | |
74 | } | |
75 | string group_header_oid = util::group_header_name(group_id); | |
76 | ||
77 | const int max_read = 1024; | |
78 | cls::rbd::GroupSnapshot snap_last; | |
79 | ||
80 | for (;;) { | |
81 | vector<cls::rbd::GroupSnapshot> snaps_page; | |
82 | ||
83 | r = cls_client::group_snap_list(&group_ioctx, group_header_oid, | |
84 | snap_last, max_read, &snaps_page); | |
85 | ||
86 | if (r < 0) { | |
87 | lderr(cct) << "error reading snap list from group: " | |
88 | << cpp_strerror(-r) << dendl; | |
89 | return r; | |
90 | } | |
91 | cls_snaps->insert(cls_snaps->end(), snaps_page.begin(), snaps_page.end()); | |
92 | if (snaps_page.size() < max_read) { | |
93 | break; | |
94 | } | |
95 | snap_last = *snaps_page.rbegin(); | |
96 | } | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | std::string calc_ind_image_snap_name(uint64_t pool_id, | |
102 | const std::string &group_id, | |
103 | const std::string &snap_id) | |
104 | { | |
105 | std::stringstream ind_snap_name_stream; | |
106 | ind_snap_name_stream << ".group." << std::hex << pool_id << "_" | |
107 | << group_id << "_" << snap_id; | |
108 | return ind_snap_name_stream.str(); | |
109 | } | |
110 | ||
111 | int group_image_list(librados::IoCtx& group_ioctx, const char *group_name, | |
112 | std::vector<cls::rbd::GroupImageStatus> *image_ids) | |
113 | { | |
114 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
115 | ||
116 | string group_id; | |
117 | ||
118 | int r = cls_client::dir_get_id(&group_ioctx, RBD_GROUP_DIRECTORY, | |
119 | group_name, &group_id); | |
120 | if (r < 0) { | |
121 | lderr(cct) << "error reading group id object: " | |
122 | << cpp_strerror(r) | |
123 | << dendl; | |
124 | return r; | |
125 | } | |
126 | string group_header_oid = util::group_header_name(group_id); | |
127 | ||
128 | ldout(cct, 20) << "listing images in group name " | |
129 | << group_name << " group id " << group_header_oid << dendl; | |
130 | image_ids->clear(); | |
131 | ||
132 | const int max_read = 1024; | |
133 | cls::rbd::GroupImageSpec start_last; | |
134 | do { | |
135 | std::vector<cls::rbd::GroupImageStatus> image_ids_page; | |
136 | ||
137 | r = cls_client::group_image_list(&group_ioctx, group_header_oid, | |
138 | start_last, max_read, &image_ids_page); | |
139 | ||
140 | if (r < 0) { | |
141 | lderr(cct) << "error reading image list from group: " | |
142 | << cpp_strerror(-r) << dendl; | |
143 | return r; | |
144 | } | |
145 | image_ids->insert(image_ids->end(), | |
146 | image_ids_page.begin(), image_ids_page.end()); | |
147 | ||
148 | if (image_ids_page.size() > 0) | |
149 | start_last = image_ids_page.rbegin()->spec; | |
150 | ||
151 | r = image_ids_page.size(); | |
152 | } while (r == max_read); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | int group_image_remove(librados::IoCtx& group_ioctx, string group_id, | |
158 | librados::IoCtx& image_ioctx, string image_id) | |
159 | { | |
160 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
161 | ||
162 | string group_header_oid = util::group_header_name(group_id); | |
163 | ||
164 | string image_header_oid = util::header_name(image_id); | |
165 | ||
166 | ldout(cct, 20) << "removing image " << image_id | |
167 | << " image id " << image_header_oid << dendl; | |
168 | ||
169 | cls::rbd::GroupSpec group_spec(group_id, group_ioctx.get_id()); | |
170 | ||
171 | cls::rbd::GroupImageStatus incomplete_st(image_id, image_ioctx.get_id(), | |
172 | cls::rbd::GROUP_IMAGE_LINK_STATE_INCOMPLETE); | |
173 | ||
174 | cls::rbd::GroupImageSpec spec(image_id, image_ioctx.get_id()); | |
175 | ||
176 | int r = cls_client::group_image_set(&group_ioctx, group_header_oid, | |
177 | incomplete_st); | |
178 | ||
179 | if (r < 0) { | |
180 | lderr(cct) << "couldn't put image into removing state: " | |
181 | << cpp_strerror(-r) << dendl; | |
182 | return r; | |
183 | } | |
184 | ||
185 | r = cls_client::image_group_remove(&image_ioctx, image_header_oid, | |
186 | group_spec); | |
187 | if ((r < 0) && (r != -ENOENT)) { | |
188 | lderr(cct) << "couldn't remove group reference from image" | |
189 | << cpp_strerror(-r) << dendl; | |
190 | return r; | |
191 | } else if (r >= 0) { | |
192 | ImageWatcher<>::notify_header_update(image_ioctx, image_header_oid); | |
193 | } | |
194 | ||
195 | r = cls_client::group_image_remove(&group_ioctx, group_header_oid, spec); | |
196 | if (r < 0) { | |
197 | lderr(cct) << "couldn't remove image from group" | |
198 | << cpp_strerror(-r) << dendl; | |
199 | return r; | |
200 | } | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | int group_snap_remove_by_record(librados::IoCtx& group_ioctx, | |
206 | const cls::rbd::GroupSnapshot& group_snap, | |
207 | const std::string& group_id, | |
208 | const std::string& group_header_oid) { | |
209 | ||
210 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
211 | std::vector<C_SaferCond*> on_finishes; | |
212 | int r, ret_code; | |
213 | ||
214 | std::vector<librbd::ImageCtx*> ictxs; | |
215 | ||
216 | cls::rbd::GroupSnapshotNamespace ne{group_ioctx.get_id(), group_id, | |
217 | group_snap.id}; | |
218 | ||
219 | ldout(cct, 20) << "Removing snapshots" << dendl; | |
220 | int snap_count = group_snap.snaps.size(); | |
221 | ||
222 | for (int i = 0; i < snap_count; ++i) { | |
223 | librbd::IoCtx image_io_ctx; | |
224 | r = util::create_ioctx(group_ioctx, "image", group_snap.snaps[i].pool, {}, | |
225 | &image_io_ctx); | |
226 | if (r < 0) { | |
227 | return r; | |
228 | } | |
229 | ||
230 | librbd::ImageCtx* image_ctx = new ImageCtx("", group_snap.snaps[i].image_id, | |
231 | nullptr, image_io_ctx, false); | |
232 | ||
233 | C_SaferCond* on_finish = new C_SaferCond; | |
234 | ||
235 | image_ctx->state->open(0, on_finish); | |
236 | ||
237 | ictxs.push_back(image_ctx); | |
238 | on_finishes.push_back(on_finish); | |
239 | } | |
240 | ||
241 | ret_code = 0; | |
242 | for (int i = 0; i < snap_count; ++i) { | |
243 | r = on_finishes[i]->wait(); | |
244 | delete on_finishes[i]; | |
245 | if (r < 0) { | |
246 | delete ictxs[i]; | |
247 | ictxs[i] = nullptr; | |
248 | ret_code = r; | |
249 | } | |
250 | } | |
251 | if (ret_code != 0) { | |
252 | goto finish; | |
253 | } | |
254 | ||
255 | ldout(cct, 20) << "Opened participating images. " << | |
256 | "Deleting snapshots themselves." << dendl; | |
257 | ||
258 | for (int i = 0; i < snap_count; ++i) { | |
259 | ImageCtx *ictx = ictxs[i]; | |
260 | on_finishes[i] = new C_SaferCond; | |
261 | ||
262 | std::string snap_name; | |
263 | ictx->snap_lock.get_read(); | |
264 | snap_t snap_id = get_group_snap_id(ictx, ne); | |
265 | r = ictx->get_snap_name(snap_id, &snap_name); | |
266 | ictx->snap_lock.put_read(); | |
267 | ||
268 | if (r >= 0) { | |
269 | ldout(cct, 20) << "removing individual snapshot from image " << ictx->name | |
270 | << dendl; | |
271 | ictx->operations->snap_remove(ne, snap_name, on_finishes[i]); | |
272 | } else { | |
273 | // We are ok to ignore missing image snapshots. The snapshot could have | |
274 | // been inconsistent in the first place. | |
275 | on_finishes[i]->complete(0); | |
276 | } | |
277 | } | |
278 | ||
279 | for (int i = 0; i < snap_count; ++i) { | |
280 | r = on_finishes[i]->wait(); | |
281 | delete on_finishes[i]; | |
282 | if (r < 0 && r != -ENOENT) { | |
283 | // if previous attempts to remove this snapshot failed then the image's | |
284 | // snapshot may not exist | |
285 | lderr(cct) << "Failed deleting image snapshot. Ret code: " << r << dendl; | |
286 | ret_code = r; | |
287 | } | |
288 | } | |
289 | ||
290 | if (ret_code != 0) { | |
291 | goto finish; | |
292 | } | |
293 | ||
294 | ldout(cct, 20) << "Removed images snapshots removing snapshot record." | |
295 | << dendl; | |
296 | ||
297 | r = cls_client::group_snap_remove(&group_ioctx, group_header_oid, | |
298 | group_snap.id); | |
299 | if (r < 0) { | |
300 | ret_code = r; | |
301 | goto finish; | |
302 | } | |
303 | ||
304 | finish: | |
305 | for (int i = 0; i < snap_count; ++i) { | |
306 | if (ictxs[i] != nullptr) { | |
307 | ictxs[i]->state->close(); | |
308 | } | |
309 | } | |
310 | return ret_code; | |
311 | } | |
312 | ||
313 | int group_snap_rollback_by_record(librados::IoCtx& group_ioctx, | |
314 | const cls::rbd::GroupSnapshot& group_snap, | |
315 | const std::string& group_id, | |
316 | const std::string& group_header_oid, | |
317 | ProgressContext& pctx) { | |
318 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
319 | std::vector<C_SaferCond*> on_finishes; | |
320 | int r, ret_code; | |
321 | ||
322 | std::vector<librbd::ImageCtx*> ictxs; | |
323 | ||
324 | cls::rbd::GroupSnapshotNamespace ne{group_ioctx.get_id(), group_id, | |
325 | group_snap.id}; | |
326 | ||
327 | ldout(cct, 20) << "Rolling back snapshots" << dendl; | |
328 | int snap_count = group_snap.snaps.size(); | |
329 | ||
330 | for (int i = 0; i < snap_count; ++i) { | |
331 | librados::IoCtx image_io_ctx; | |
332 | r = util::create_ioctx(group_ioctx, "image", group_snap.snaps[i].pool, {}, | |
333 | &image_io_ctx); | |
334 | if (r < 0) { | |
335 | return r; | |
336 | } | |
337 | ||
338 | librbd::ImageCtx* image_ctx = new ImageCtx("", group_snap.snaps[i].image_id, | |
339 | nullptr, image_io_ctx, false); | |
340 | ||
341 | C_SaferCond* on_finish = new C_SaferCond; | |
342 | ||
343 | image_ctx->state->open(0, on_finish); | |
344 | ||
345 | ictxs.push_back(image_ctx); | |
346 | on_finishes.push_back(on_finish); | |
347 | } | |
348 | ||
349 | ret_code = 0; | |
350 | for (int i = 0; i < snap_count; ++i) { | |
351 | r = on_finishes[i]->wait(); | |
352 | delete on_finishes[i]; | |
353 | if (r < 0) { | |
354 | delete ictxs[i]; | |
355 | ictxs[i] = nullptr; | |
356 | ret_code = r; | |
357 | } | |
358 | } | |
359 | if (ret_code != 0) { | |
360 | goto finish; | |
361 | } | |
362 | ||
363 | ldout(cct, 20) << "Requesting exclusive locks for images" << dendl; | |
364 | for (auto ictx: ictxs) { | |
365 | RWLock::RLocker owner_lock(ictx->owner_lock); | |
366 | if (ictx->exclusive_lock != nullptr) { | |
367 | ictx->exclusive_lock->block_requests(-EBUSY); | |
368 | } | |
369 | } | |
370 | for (int i = 0; i < snap_count; ++i) { | |
371 | ImageCtx *ictx = ictxs[i]; | |
372 | RWLock::RLocker owner_lock(ictx->owner_lock); | |
373 | ||
374 | on_finishes[i] = new C_SaferCond; | |
375 | if (ictx->exclusive_lock != nullptr) { | |
376 | ictx->exclusive_lock->acquire_lock(on_finishes[i]); | |
377 | } | |
378 | } | |
379 | ||
380 | ret_code = 0; | |
381 | for (int i = 0; i < snap_count; ++i) { | |
382 | r = 0; | |
383 | ImageCtx *ictx = ictxs[i]; | |
384 | if (ictx->exclusive_lock != nullptr) { | |
385 | r = on_finishes[i]->wait(); | |
386 | } | |
387 | delete on_finishes[i]; | |
388 | if (r < 0) { | |
389 | ret_code = r; | |
390 | } | |
391 | } | |
392 | if (ret_code != 0) { | |
393 | goto finish; | |
394 | } | |
395 | ||
396 | for (int i = 0; i < snap_count; ++i) { | |
397 | ImageCtx *ictx = ictxs[i]; | |
398 | on_finishes[i] = new C_SaferCond; | |
399 | ||
400 | RWLock::RLocker owner_locker(ictx->owner_lock); | |
401 | std::string snap_name; | |
402 | ictx->snap_lock.get_read(); | |
403 | snap_t snap_id = get_group_snap_id(ictx, ne); | |
404 | r = ictx->get_snap_name(snap_id, &snap_name); | |
405 | ictx->snap_lock.put_read(); | |
406 | ||
407 | if (r >= 0) { | |
408 | ldout(cct, 20) << "rolling back to individual snapshot for image " << ictx->name | |
409 | << dendl; | |
410 | ictx->operations->execute_snap_rollback(ne, snap_name, pctx, on_finishes[i]); | |
411 | } else { | |
412 | on_finishes[i]->complete(r); | |
413 | } | |
414 | } | |
415 | ||
416 | for (int i = 0; i < snap_count; ++i) { | |
417 | r = on_finishes[i]->wait(); | |
418 | delete on_finishes[i]; | |
419 | if (r < 0 && r != -ENOENT) { | |
420 | lderr(cct) << "Failed rolling back group to snapshot. Ret code: " << r << dendl; | |
421 | ret_code = r; | |
422 | } | |
423 | } | |
424 | ||
425 | finish: | |
426 | for (int i = 0; i < snap_count; ++i) { | |
427 | if (ictxs[i] != nullptr) { | |
428 | ictxs[i]->state->close(); | |
429 | } | |
430 | } | |
431 | return ret_code; | |
432 | } | |
433 | ||
434 | } // anonymous namespace | |
435 | ||
436 | template <typename I> | |
437 | int Group<I>::image_remove_by_id(librados::IoCtx& group_ioctx, | |
438 | const char *group_name, | |
439 | librados::IoCtx& image_ioctx, | |
440 | const char *image_id) | |
441 | { | |
442 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
443 | ldout(cct, 20) << "io_ctx=" << &group_ioctx | |
444 | << " group name " << group_name << " image " | |
445 | << &image_ioctx << " id " << image_id << dendl; | |
446 | ||
447 | string group_id; | |
448 | ||
449 | int r = cls_client::dir_get_id(&group_ioctx, RBD_GROUP_DIRECTORY, group_name, | |
450 | &group_id); | |
451 | if (r < 0) { | |
452 | lderr(cct) << "error reading group id object: " | |
453 | << cpp_strerror(r) | |
454 | << dendl; | |
455 | return r; | |
456 | } | |
457 | ||
458 | ldout(cct, 20) << "removing image from group name " << group_name | |
459 | << " group id " << group_id << dendl; | |
460 | ||
461 | return group_image_remove(group_ioctx, group_id, image_ioctx, string(image_id)); | |
462 | } | |
463 | ||
464 | template <typename I> | |
465 | int Group<I>::create(librados::IoCtx& io_ctx, const char *group_name) | |
466 | { | |
467 | CephContext *cct = (CephContext *)io_ctx.cct(); | |
468 | ||
469 | string id = generate_uuid(io_ctx); | |
470 | ||
471 | ldout(cct, 2) << "adding group to directory..." << dendl; | |
472 | ||
473 | int r = cls_client::group_dir_add(&io_ctx, RBD_GROUP_DIRECTORY, group_name, | |
474 | id); | |
475 | if (r < 0) { | |
476 | lderr(cct) << "error adding group to directory: " | |
477 | << cpp_strerror(r) | |
478 | << dendl; | |
479 | return r; | |
480 | } | |
481 | string header_oid = util::group_header_name(id); | |
482 | ||
483 | r = io_ctx.create(header_oid, true); | |
484 | if (r < 0) { | |
485 | lderr(cct) << "error creating group header: " << cpp_strerror(r) << dendl; | |
486 | goto err_remove_from_dir; | |
487 | } | |
488 | ||
489 | return 0; | |
490 | ||
491 | err_remove_from_dir: | |
492 | int remove_r = cls_client::group_dir_remove(&io_ctx, RBD_GROUP_DIRECTORY, | |
493 | group_name, id); | |
494 | if (remove_r < 0) { | |
495 | lderr(cct) << "error cleaning up group from rbd_directory " | |
496 | << "object after creation failed: " << cpp_strerror(remove_r) | |
497 | << dendl; | |
498 | } | |
499 | ||
500 | return r; | |
501 | } | |
502 | ||
503 | template <typename I> | |
504 | int Group<I>::remove(librados::IoCtx& io_ctx, const char *group_name) | |
505 | { | |
506 | CephContext *cct((CephContext *)io_ctx.cct()); | |
507 | ldout(cct, 20) << "group_remove " << &io_ctx << " " << group_name << dendl; | |
508 | ||
509 | std::string group_id; | |
510 | int r = cls_client::dir_get_id(&io_ctx, RBD_GROUP_DIRECTORY, | |
511 | std::string(group_name), &group_id); | |
512 | if (r < 0 && r != -ENOENT) { | |
513 | lderr(cct) << "error getting id of group" << dendl; | |
514 | return r; | |
515 | } | |
516 | string group_header_oid = util::group_header_name(group_id); | |
517 | ||
518 | std::vector<cls::rbd::GroupSnapshot> snaps; | |
519 | r = group_snap_list(io_ctx, group_name, &snaps); | |
520 | if (r < 0 && r != -ENOENT) { | |
521 | lderr(cct) << "error listing group snapshots" << dendl; | |
522 | return r; | |
523 | } | |
524 | ||
525 | for (auto &snap : snaps) { | |
526 | r = group_snap_remove_by_record(io_ctx, snap, group_id, group_header_oid); | |
527 | if (r < 0) { | |
528 | return r; | |
529 | } | |
530 | } | |
531 | ||
532 | std::vector<cls::rbd::GroupImageStatus> images; | |
533 | r = group_image_list(io_ctx, group_name, &images); | |
534 | if (r < 0 && r != -ENOENT) { | |
535 | lderr(cct) << "error listing group images" << dendl; | |
536 | return r; | |
537 | } | |
538 | ||
539 | for (auto image : images) { | |
540 | IoCtx image_ioctx; | |
541 | r = util::create_ioctx(io_ctx, "image", image.spec.pool_id, {}, | |
542 | &image_ioctx); | |
543 | if (r < 0) { | |
544 | return r; | |
545 | } | |
546 | ||
547 | r = group_image_remove(io_ctx, group_id, image_ioctx, image.spec.image_id); | |
548 | if (r < 0 && r != -ENOENT) { | |
549 | lderr(cct) << "error removing image from a group" << dendl; | |
550 | return r; | |
551 | } | |
552 | } | |
553 | ||
554 | string header_oid = util::group_header_name(group_id); | |
555 | ||
556 | r = io_ctx.remove(header_oid); | |
557 | if (r < 0 && r != -ENOENT) { | |
558 | lderr(cct) << "error removing header: " << cpp_strerror(-r) << dendl; | |
559 | return r; | |
560 | } | |
561 | ||
562 | r = cls_client::group_dir_remove(&io_ctx, RBD_GROUP_DIRECTORY, | |
563 | group_name, group_id); | |
564 | if (r < 0 && r != -ENOENT) { | |
565 | lderr(cct) << "error removing group from directory" << dendl; | |
566 | return r; | |
567 | } | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | template <typename I> | |
573 | int Group<I>::list(IoCtx& io_ctx, vector<string> *names) | |
574 | { | |
575 | CephContext *cct = (CephContext *)io_ctx.cct(); | |
576 | ldout(cct, 20) << "io_ctx=" << &io_ctx << dendl; | |
577 | ||
578 | int max_read = 1024; | |
579 | string last_read = ""; | |
580 | int r; | |
581 | do { | |
582 | map<string, string> groups; | |
583 | r = cls_client::group_dir_list(&io_ctx, RBD_GROUP_DIRECTORY, last_read, | |
584 | max_read, &groups); | |
585 | if (r == -ENOENT) { | |
586 | return 0; // Ignore missing rbd group directory. It means we don't have any groups yet. | |
587 | } | |
588 | if (r < 0) { | |
589 | if (r != -ENOENT) { | |
590 | lderr(cct) << "error listing group in directory: " | |
591 | << cpp_strerror(r) << dendl; | |
592 | } else { | |
593 | r = 0; | |
594 | } | |
595 | return r; | |
596 | } | |
597 | for (pair<string, string> group : groups) { | |
598 | names->push_back(group.first); | |
599 | } | |
600 | if (!groups.empty()) { | |
601 | last_read = groups.rbegin()->first; | |
602 | } | |
603 | r = groups.size(); | |
604 | } while (r == max_read); | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
609 | template <typename I> | |
610 | int Group<I>::image_add(librados::IoCtx& group_ioctx, const char *group_name, | |
611 | librados::IoCtx& image_ioctx, const char *image_name) | |
612 | { | |
613 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
614 | ldout(cct, 20) << "io_ctx=" << &group_ioctx | |
615 | << " group name " << group_name << " image " | |
616 | << &image_ioctx << " name " << image_name << dendl; | |
617 | ||
618 | if (group_ioctx.get_namespace() != image_ioctx.get_namespace()) { | |
619 | lderr(cct) << "group and image cannot be in different namespaces" << dendl; | |
620 | return -EINVAL; | |
621 | } | |
622 | ||
623 | string group_id; | |
624 | ||
625 | int r = cls_client::dir_get_id(&group_ioctx, RBD_GROUP_DIRECTORY, group_name, | |
626 | &group_id); | |
627 | if (r < 0) { | |
628 | lderr(cct) << "error reading group id object: " | |
629 | << cpp_strerror(r) | |
630 | << dendl; | |
631 | return r; | |
632 | } | |
633 | string group_header_oid = util::group_header_name(group_id); | |
634 | ||
635 | ||
636 | ldout(cct, 20) << "adding image to group name " << group_name | |
637 | << " group id " << group_header_oid << dendl; | |
638 | ||
639 | string image_id; | |
640 | ||
641 | r = cls_client::dir_get_id(&image_ioctx, RBD_DIRECTORY, image_name, | |
642 | &image_id); | |
643 | if (r < 0) { | |
644 | lderr(cct) << "error reading image id object: " | |
645 | << cpp_strerror(-r) << dendl; | |
646 | return r; | |
647 | } | |
648 | ||
649 | string image_header_oid = util::header_name(image_id); | |
650 | ||
651 | ldout(cct, 20) << "adding image " << image_name | |
652 | << " image id " << image_header_oid << dendl; | |
653 | ||
654 | cls::rbd::GroupImageStatus incomplete_st( | |
655 | image_id, image_ioctx.get_id(), | |
656 | cls::rbd::GROUP_IMAGE_LINK_STATE_INCOMPLETE); | |
657 | cls::rbd::GroupImageStatus attached_st( | |
658 | image_id, image_ioctx.get_id(), cls::rbd::GROUP_IMAGE_LINK_STATE_ATTACHED); | |
659 | ||
660 | r = cls_client::group_image_set(&group_ioctx, group_header_oid, | |
661 | incomplete_st); | |
662 | ||
663 | cls::rbd::GroupSpec group_spec(group_id, group_ioctx.get_id()); | |
664 | ||
665 | if (r < 0) { | |
666 | lderr(cct) << "error adding image reference to group: " | |
667 | << cpp_strerror(-r) << dendl; | |
668 | return r; | |
669 | } | |
670 | ||
671 | r = cls_client::image_group_add(&image_ioctx, image_header_oid, group_spec); | |
672 | if (r < 0) { | |
673 | lderr(cct) << "error adding group reference to image: " | |
674 | << cpp_strerror(-r) << dendl; | |
675 | cls::rbd::GroupImageSpec spec(image_id, image_ioctx.get_id()); | |
676 | cls_client::group_image_remove(&group_ioctx, group_header_oid, spec); | |
677 | // Ignore errors in the clean up procedure. | |
678 | return r; | |
679 | } | |
680 | ImageWatcher<>::notify_header_update(image_ioctx, image_header_oid); | |
681 | ||
682 | r = cls_client::group_image_set(&group_ioctx, group_header_oid, | |
683 | attached_st); | |
684 | ||
685 | return r; | |
686 | } | |
687 | ||
688 | template <typename I> | |
689 | int Group<I>::image_remove(librados::IoCtx& group_ioctx, const char *group_name, | |
690 | librados::IoCtx& image_ioctx, const char *image_name) | |
691 | { | |
692 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
693 | ldout(cct, 20) << "io_ctx=" << &group_ioctx | |
694 | << " group name " << group_name << " image " | |
695 | << &image_ioctx << " name " << image_name << dendl; | |
696 | ||
697 | if (group_ioctx.get_namespace() != image_ioctx.get_namespace()) { | |
698 | lderr(cct) << "group and image cannot be in different namespaces" << dendl; | |
699 | return -EINVAL; | |
700 | } | |
701 | ||
702 | string group_id; | |
703 | ||
704 | int r = cls_client::dir_get_id(&group_ioctx, RBD_GROUP_DIRECTORY, group_name, | |
705 | &group_id); | |
706 | if (r < 0) { | |
707 | lderr(cct) << "error reading group id object: " | |
708 | << cpp_strerror(r) | |
709 | << dendl; | |
710 | return r; | |
711 | } | |
712 | ||
713 | ldout(cct, 20) << "removing image from group name " << group_name | |
714 | << " group id " << group_id << dendl; | |
715 | ||
716 | string image_id; | |
717 | r = cls_client::dir_get_id(&image_ioctx, RBD_DIRECTORY, image_name, | |
718 | &image_id); | |
719 | if (r < 0) { | |
720 | lderr(cct) << "error reading image id object: " | |
721 | << cpp_strerror(-r) << dendl; | |
722 | return r; | |
723 | } | |
724 | ||
725 | r = group_image_remove(group_ioctx, group_id, image_ioctx, image_id); | |
726 | ||
727 | return r; | |
728 | } | |
729 | ||
730 | template <typename I> | |
731 | int Group<I>::image_list(librados::IoCtx& group_ioctx, | |
732 | const char *group_name, | |
733 | std::vector<group_image_info_t>* images) | |
734 | { | |
735 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
736 | ldout(cct, 20) << "io_ctx=" << &group_ioctx | |
737 | << " group name " << group_name << dendl; | |
738 | ||
739 | std::vector<cls::rbd::GroupImageStatus> image_ids; | |
740 | ||
741 | group_image_list(group_ioctx, group_name, &image_ids); | |
742 | ||
743 | for (auto image_id : image_ids) { | |
744 | IoCtx ioctx; | |
745 | int r = util::create_ioctx(group_ioctx, "image", image_id.spec.pool_id, {}, | |
746 | &ioctx); | |
747 | if (r < 0) { | |
748 | return r; | |
749 | } | |
750 | ||
751 | std::string image_name; | |
752 | r = cls_client::dir_get_name(&ioctx, RBD_DIRECTORY, | |
753 | image_id.spec.image_id, &image_name); | |
754 | if (r < 0) { | |
755 | return r; | |
756 | } | |
757 | ||
758 | images->push_back( | |
759 | group_image_info_t { | |
760 | image_name, | |
761 | ioctx.get_id(), | |
762 | static_cast<group_image_state_t>(image_id.state)}); | |
763 | } | |
764 | ||
765 | return 0; | |
766 | } | |
767 | ||
768 | template <typename I> | |
769 | int Group<I>::rename(librados::IoCtx& io_ctx, const char *src_name, | |
770 | const char *dest_name) | |
771 | { | |
772 | CephContext *cct((CephContext *)io_ctx.cct()); | |
773 | ldout(cct, 20) << "group_rename " << &io_ctx << " " << src_name | |
774 | << " -> " << dest_name << dendl; | |
775 | ||
776 | std::string group_id; | |
777 | int r = cls_client::dir_get_id(&io_ctx, RBD_GROUP_DIRECTORY, | |
778 | std::string(src_name), &group_id); | |
779 | if (r < 0) { | |
780 | if (r != -ENOENT) | |
781 | lderr(cct) << "error getting id of group" << dendl; | |
782 | return r; | |
783 | } | |
784 | ||
785 | r = cls_client::group_dir_rename(&io_ctx, RBD_GROUP_DIRECTORY, | |
786 | src_name, dest_name, group_id); | |
787 | if (r < 0 && r != -ENOENT) { | |
788 | lderr(cct) << "error renaming group from directory" << dendl; | |
789 | return r; | |
790 | } | |
791 | ||
792 | return 0; | |
793 | } | |
794 | ||
795 | ||
796 | template <typename I> | |
797 | int Group<I>::image_get_group(I *ictx, group_info_t *group_info) | |
798 | { | |
799 | int r = ictx->state->refresh_if_required(); | |
800 | if (r < 0) | |
801 | return r; | |
802 | ||
803 | if (RBD_GROUP_INVALID_POOL != ictx->group_spec.pool_id) { | |
804 | IoCtx ioctx; | |
805 | r = util::create_ioctx(ictx->md_ctx, "group", ictx->group_spec.pool_id, {}, | |
806 | &ioctx); | |
807 | if (r < 0) { | |
808 | return r; | |
809 | } | |
810 | ||
811 | std::string group_name; | |
812 | r = cls_client::dir_get_name(&ioctx, RBD_GROUP_DIRECTORY, | |
813 | ictx->group_spec.group_id, &group_name); | |
814 | if (r < 0) | |
815 | return r; | |
816 | group_info->pool = ioctx.get_id(); | |
817 | group_info->name = group_name; | |
818 | } else { | |
819 | group_info->pool = RBD_GROUP_INVALID_POOL; | |
820 | group_info->name = ""; | |
821 | } | |
822 | ||
823 | return 0; | |
824 | } | |
825 | ||
826 | template <typename I> | |
827 | int Group<I>::snap_create(librados::IoCtx& group_ioctx, | |
828 | const char *group_name, const char *snap_name) | |
829 | { | |
830 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
831 | ||
832 | string group_id; | |
833 | cls::rbd::GroupSnapshot group_snap; | |
834 | vector<cls::rbd::ImageSnapshotSpec> image_snaps; | |
835 | std::string ind_snap_name; | |
836 | ||
837 | std::vector<librbd::ImageCtx*> ictxs; | |
838 | std::vector<C_SaferCond*> on_finishes; | |
839 | ||
840 | int r = cls_client::dir_get_id(&group_ioctx, RBD_GROUP_DIRECTORY, | |
841 | group_name, &group_id); | |
842 | if (r < 0) { | |
843 | lderr(cct) << "error reading group id object: " | |
844 | << cpp_strerror(r) | |
845 | << dendl; | |
846 | return r; | |
847 | } | |
848 | ||
849 | std::vector<cls::rbd::GroupImageStatus> images; | |
850 | r = group_image_list(group_ioctx, group_name, &images); | |
851 | if (r < 0) { | |
852 | return r; | |
853 | } | |
854 | int image_count = images.size(); | |
855 | ||
856 | ldout(cct, 20) << "Found " << image_count << " images in group" << dendl; | |
857 | ||
858 | image_snaps = vector<cls::rbd::ImageSnapshotSpec>(image_count, | |
859 | cls::rbd::ImageSnapshotSpec()); | |
860 | ||
861 | for (int i = 0; i < image_count; ++i) { | |
862 | image_snaps[i].pool = images[i].spec.pool_id; | |
863 | image_snaps[i].image_id = images[i].spec.image_id; | |
864 | } | |
865 | ||
866 | string group_header_oid = util::group_header_name(group_id); | |
867 | ||
868 | group_snap.id = generate_uuid(group_ioctx); | |
869 | group_snap.name = string(snap_name); | |
870 | group_snap.state = cls::rbd::GROUP_SNAPSHOT_STATE_INCOMPLETE; | |
871 | group_snap.snaps = image_snaps; | |
872 | ||
873 | cls::rbd::GroupSnapshotNamespace ne{group_ioctx.get_id(), group_id, | |
874 | group_snap.id}; | |
875 | ||
876 | r = cls_client::group_snap_set(&group_ioctx, group_header_oid, group_snap); | |
877 | if (r == -EEXIST) { | |
878 | lderr(cct) << "snapshot with this name already exists: " | |
879 | << cpp_strerror(r) | |
880 | << dendl; | |
881 | } | |
882 | int ret_code = 0; | |
883 | if (r < 0) { | |
884 | ret_code = r; | |
885 | goto finish; | |
886 | } | |
887 | ||
888 | for (auto image: images) { | |
889 | librbd::IoCtx image_io_ctx; | |
890 | r = util::create_ioctx(group_ioctx, "image", image.spec.pool_id, {}, | |
891 | &image_io_ctx); | |
892 | if (r < 0) { | |
893 | ret_code = r; | |
894 | goto finish; | |
895 | } | |
896 | ||
897 | ldout(cct, 20) << "Opening image with id " << image.spec.image_id << dendl; | |
898 | ||
899 | librbd::ImageCtx* image_ctx = new ImageCtx("", image.spec.image_id.c_str(), | |
900 | nullptr, image_io_ctx, false); | |
901 | ||
902 | C_SaferCond* on_finish = new C_SaferCond; | |
903 | ||
904 | image_ctx->state->open(0, on_finish); | |
905 | ||
906 | ictxs.push_back(image_ctx); | |
907 | on_finishes.push_back(on_finish); | |
908 | } | |
909 | ldout(cct, 20) << "Issued open request waiting for the completion" << dendl; | |
910 | ret_code = 0; | |
911 | for (int i = 0; i < image_count; ++i) { | |
912 | ||
913 | ldout(cct, 20) << "Waiting for completion on on_finish: " << | |
914 | on_finishes[i] << dendl; | |
915 | ||
916 | r = on_finishes[i]->wait(); | |
917 | delete on_finishes[i]; | |
918 | if (r < 0) { | |
919 | delete ictxs[i]; | |
920 | ictxs[i] = nullptr; | |
921 | ret_code = r; | |
922 | } | |
923 | } | |
924 | if (ret_code != 0) { | |
925 | goto remove_record; | |
926 | } | |
927 | ldout(cct, 20) << "Requesting exclusive locks for images" << dendl; | |
928 | ||
929 | for (auto ictx: ictxs) { | |
930 | RWLock::RLocker owner_lock(ictx->owner_lock); | |
931 | if (ictx->exclusive_lock != nullptr) { | |
932 | ictx->exclusive_lock->block_requests(-EBUSY); | |
933 | } | |
934 | } | |
935 | for (int i = 0; i < image_count; ++i) { | |
936 | ImageCtx *ictx = ictxs[i]; | |
937 | RWLock::RLocker owner_lock(ictx->owner_lock); | |
938 | ||
939 | on_finishes[i] = new C_SaferCond; | |
940 | if (ictx->exclusive_lock != nullptr) { | |
941 | ictx->exclusive_lock->acquire_lock(on_finishes[i]); | |
942 | } | |
943 | } | |
944 | ||
945 | ret_code = 0; | |
946 | for (int i = 0; i < image_count; ++i) { | |
947 | r = 0; | |
948 | ImageCtx *ictx = ictxs[i]; | |
949 | if (ictx->exclusive_lock != nullptr) { | |
950 | r = on_finishes[i]->wait(); | |
951 | } | |
952 | delete on_finishes[i]; | |
953 | if (r < 0) { | |
954 | ret_code = r; | |
955 | } | |
956 | } | |
957 | if (ret_code != 0) { | |
958 | goto remove_record; | |
959 | } | |
960 | ||
961 | ind_snap_name = calc_ind_image_snap_name(group_ioctx.get_id(), group_id, | |
962 | group_snap.id); | |
963 | ||
964 | for (int i = 0; i < image_count; ++i) { | |
965 | ImageCtx *ictx = ictxs[i]; | |
966 | ||
967 | C_SaferCond* on_finish = new C_SaferCond; | |
968 | ||
969 | ictx->operations->snap_create(ne, ind_snap_name.c_str(), on_finish); | |
970 | ||
971 | on_finishes[i] = on_finish; | |
972 | } | |
973 | ||
974 | ret_code = 0; | |
975 | for (int i = 0; i < image_count; ++i) { | |
976 | r = on_finishes[i]->wait(); | |
977 | delete on_finishes[i]; | |
978 | if (r < 0) { | |
979 | ret_code = r; | |
980 | } else { | |
981 | ImageCtx *ictx = ictxs[i]; | |
982 | ictx->snap_lock.get_read(); | |
983 | snap_t snap_id = get_group_snap_id(ictx, ne); | |
984 | ictx->snap_lock.put_read(); | |
985 | if (snap_id == CEPH_NOSNAP) { | |
986 | ldout(cct, 20) << "Couldn't find created snapshot with namespace: " | |
987 | << ne << dendl; | |
988 | ret_code = -ENOENT; | |
989 | } else { | |
990 | image_snaps[i].snap_id = snapid_t(snap_id); | |
991 | image_snaps[i].pool = ictx->md_ctx.get_id(); | |
992 | image_snaps[i].image_id = ictx->id; | |
993 | } | |
994 | } | |
995 | } | |
996 | if (ret_code != 0) { | |
997 | goto remove_image_snaps; | |
998 | } | |
999 | ||
1000 | group_snap.snaps = image_snaps; | |
1001 | group_snap.state = cls::rbd::GROUP_SNAPSHOT_STATE_COMPLETE; | |
1002 | ||
1003 | r = cls_client::group_snap_set(&group_ioctx, group_header_oid, group_snap); | |
1004 | if (r < 0) { | |
1005 | ret_code = r; | |
1006 | goto remove_image_snaps; | |
1007 | } | |
1008 | ||
1009 | goto finish; | |
1010 | ||
1011 | remove_image_snaps: | |
1012 | ||
1013 | for (int i = 0; i < image_count; ++i) { | |
1014 | ImageCtx *ictx = ictxs[i]; | |
1015 | ldout(cct, 20) << "Removing individual snapshot with name: " << | |
1016 | ind_snap_name << dendl; | |
1017 | ||
1018 | on_finishes[i] = new C_SaferCond; | |
1019 | std::string snap_name; | |
1020 | ictx->snap_lock.get_read(); | |
1021 | snap_t snap_id = get_group_snap_id(ictx, ne); | |
1022 | r = ictx->get_snap_name(snap_id, &snap_name); | |
1023 | ictx->snap_lock.put_read(); | |
1024 | if (r >= 0) { | |
1025 | ictx->operations->snap_remove(ne, snap_name.c_str(), on_finishes[i]); | |
1026 | } else { | |
1027 | // Ignore missing image snapshots. The whole snapshot could have been | |
1028 | // inconsistent. | |
1029 | on_finishes[i]->complete(0); | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | for (int i = 0, n = on_finishes.size(); i < n; ++i) { | |
1034 | r = on_finishes[i]->wait(); | |
1035 | delete on_finishes[i]; | |
1036 | if (r < 0 && r != -ENOENT) { // if previous attempts to remove this snapshot failed then the image's snapshot may not exist | |
1037 | lderr(cct) << "Failed cleaning up image snapshot. Ret code: " << r << dendl; | |
1038 | // just report error, but don't abort the process | |
1039 | } | |
1040 | } | |
1041 | ||
1042 | remove_record: | |
1043 | r = cls_client::group_snap_remove(&group_ioctx, group_header_oid, | |
1044 | group_snap.id); | |
1045 | if (r < 0) { | |
1046 | lderr(cct) << "error while cleaning up group snapshot" << dendl; | |
1047 | // we ignore return value in clean up | |
1048 | } | |
1049 | ||
1050 | finish: | |
1051 | for (int i = 0, n = ictxs.size(); i < n; ++i) { | |
1052 | if (ictxs[i] != nullptr) { | |
1053 | ictxs[i]->state->close(); | |
1054 | } | |
1055 | } | |
1056 | return ret_code; | |
1057 | } | |
1058 | ||
1059 | template <typename I> | |
1060 | int Group<I>::snap_remove(librados::IoCtx& group_ioctx, const char *group_name, | |
1061 | const char *snap_name) | |
1062 | { | |
1063 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
1064 | ||
1065 | string group_id; | |
1066 | int r = cls_client::dir_get_id(&group_ioctx, RBD_GROUP_DIRECTORY, | |
1067 | group_name, &group_id); | |
1068 | if (r < 0) { | |
1069 | lderr(cct) << "error reading group id object: " | |
1070 | << cpp_strerror(r) | |
1071 | << dendl; | |
1072 | return r; | |
1073 | } | |
1074 | ||
1075 | std::vector<cls::rbd::GroupSnapshot> snaps; | |
1076 | r = group_snap_list(group_ioctx, group_name, &snaps); | |
1077 | if (r < 0) { | |
1078 | return r; | |
1079 | } | |
1080 | ||
1081 | cls::rbd::GroupSnapshot *group_snap = nullptr; | |
1082 | for (auto &snap : snaps) { | |
1083 | if (snap.name == string(snap_name)) { | |
1084 | group_snap = &snap; | |
1085 | break; | |
1086 | } | |
1087 | } | |
1088 | if (group_snap == nullptr) { | |
1089 | return -ENOENT; | |
1090 | } | |
1091 | ||
1092 | string group_header_oid = util::group_header_name(group_id); | |
1093 | r = group_snap_remove_by_record(group_ioctx, *group_snap, group_id, | |
1094 | group_header_oid); | |
1095 | return r; | |
1096 | } | |
1097 | ||
1098 | template <typename I> | |
1099 | int Group<I>::snap_rename(librados::IoCtx& group_ioctx, const char *group_name, | |
1100 | const char *old_snap_name, | |
1101 | const char *new_snap_name) { | |
1102 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
1103 | if (0 == strcmp(old_snap_name, new_snap_name)) | |
1104 | return -EEXIST; | |
1105 | ||
1106 | std::string group_id; | |
1107 | int r = cls_client::dir_get_id(&group_ioctx, RBD_GROUP_DIRECTORY, | |
1108 | group_name, &group_id); | |
1109 | if (r == -ENOENT) { | |
1110 | return r; | |
1111 | } else if (r < 0) { | |
1112 | lderr(cct) << "error reading group id object: " << cpp_strerror(r) << dendl; | |
1113 | return r; | |
1114 | } | |
1115 | ||
1116 | std::vector<cls::rbd::GroupSnapshot> group_snaps; | |
1117 | r = group_snap_list(group_ioctx, group_name, &group_snaps); | |
1118 | if (r < 0) { | |
1119 | return r; | |
1120 | } | |
1121 | ||
1122 | cls::rbd::GroupSnapshot group_snap; | |
1123 | for (auto &snap : group_snaps) { | |
1124 | if (snap.name == old_snap_name) { | |
1125 | group_snap = snap; | |
1126 | break; | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | if (group_snap.id.empty()) { | |
1131 | return -ENOENT; | |
1132 | } | |
1133 | ||
1134 | std::string group_header_oid = util::group_header_name(group_id); | |
1135 | group_snap.name = new_snap_name; | |
1136 | r = cls_client::group_snap_set(&group_ioctx, group_header_oid, group_snap); | |
1137 | if (r < 0) { | |
1138 | return r; | |
1139 | } | |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | template <typename I> | |
1145 | int Group<I>::snap_list(librados::IoCtx& group_ioctx, const char *group_name, | |
1146 | std::vector<group_snap_info_t> *snaps) | |
1147 | { | |
1148 | std::vector<cls::rbd::GroupSnapshot> cls_snaps; | |
1149 | ||
1150 | int r = group_snap_list(group_ioctx, group_name, &cls_snaps); | |
1151 | if (r < 0) { | |
1152 | return r; | |
1153 | } | |
1154 | ||
1155 | for (auto snap : cls_snaps) { | |
1156 | snaps->push_back( | |
1157 | group_snap_info_t { | |
1158 | snap.name, | |
1159 | static_cast<group_snap_state_t>(snap.state)}); | |
1160 | ||
1161 | } | |
1162 | return 0; | |
1163 | } | |
1164 | ||
1165 | template <typename I> | |
1166 | int Group<I>::snap_rollback(librados::IoCtx& group_ioctx, | |
1167 | const char *group_name, const char *snap_name, | |
1168 | ProgressContext& pctx) | |
1169 | { | |
1170 | CephContext *cct = (CephContext *)group_ioctx.cct(); | |
1171 | ||
1172 | string group_id; | |
1173 | int r = cls_client::dir_get_id(&group_ioctx, RBD_GROUP_DIRECTORY, | |
1174 | group_name, &group_id); | |
1175 | if (r < 0) { | |
1176 | lderr(cct) << "error reading group id object: " | |
1177 | << cpp_strerror(r) << dendl; | |
1178 | return r; | |
1179 | } | |
1180 | ||
1181 | std::vector<cls::rbd::GroupSnapshot> snaps; | |
1182 | r = group_snap_list(group_ioctx, group_name, &snaps); | |
1183 | if (r < 0) { | |
1184 | return r; | |
1185 | } | |
1186 | ||
1187 | cls::rbd::GroupSnapshot *group_snap = nullptr; | |
1188 | for (auto &snap : snaps) { | |
1189 | if (snap.name == string(snap_name)) { | |
1190 | group_snap = &snap; | |
1191 | break; | |
1192 | } | |
1193 | } | |
1194 | if (group_snap == nullptr) { | |
1195 | return -ENOENT; | |
1196 | } | |
1197 | ||
1198 | string group_header_oid = util::group_header_name(group_id); | |
1199 | r = group_snap_rollback_by_record(group_ioctx, *group_snap, group_id, | |
1200 | group_header_oid, pctx); | |
1201 | return r; | |
1202 | } | |
1203 | ||
1204 | } // namespace api | |
1205 | } // namespace librbd | |
1206 | ||
1207 | template class librbd::api::Group<librbd::ImageCtx>; |