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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 "librbd/image/OpenRequest.h" | |
5 | #include "common/dout.h" | |
6 | #include "common/errno.h" | |
7 | #include "cls/rbd/cls_rbd_client.h" | |
8 | #include "librbd/ImageCtx.h" | |
9 | #include "librbd/Utils.h" | |
10 | #include "librbd/image/CloseRequest.h" | |
11 | #include "librbd/image/RefreshRequest.h" | |
12 | #include "librbd/image/SetSnapRequest.h" | |
13 | #include <boost/algorithm/string/predicate.hpp> | |
14 | #include "include/assert.h" | |
15 | ||
16 | #define dout_subsys ceph_subsys_rbd | |
17 | #undef dout_prefix | |
18 | #define dout_prefix *_dout << "librbd::image::OpenRequest: " | |
19 | ||
20 | namespace librbd { | |
21 | namespace image { | |
22 | ||
23 | namespace { | |
24 | ||
25 | static uint64_t MAX_METADATA_ITEMS = 128; | |
26 | ||
27 | } | |
28 | ||
29 | using util::create_context_callback; | |
30 | using util::create_rados_callback; | |
31 | ||
32 | template <typename I> | |
33 | OpenRequest<I>::OpenRequest(I *image_ctx, bool skip_open_parent, | |
34 | Context *on_finish) | |
35 | : m_image_ctx(image_ctx), m_skip_open_parent_image(skip_open_parent), | |
36 | m_on_finish(on_finish), m_error_result(0), | |
37 | m_last_metadata_key(ImageCtx::METADATA_CONF_PREFIX) { | |
38 | } | |
39 | ||
40 | template <typename I> | |
41 | void OpenRequest<I>::send() { | |
42 | send_v2_detect_header(); | |
43 | } | |
44 | ||
45 | template <typename I> | |
46 | void OpenRequest<I>::send_v1_detect_header() { | |
47 | librados::ObjectReadOperation op; | |
48 | op.stat(NULL, NULL, NULL); | |
49 | ||
50 | using klass = OpenRequest<I>; | |
51 | librados::AioCompletion *comp = | |
52 | create_rados_callback<klass, &klass::handle_v1_detect_header>(this); | |
53 | m_out_bl.clear(); | |
54 | m_image_ctx->md_ctx.aio_operate(util::old_header_name(m_image_ctx->name), | |
55 | comp, &op, &m_out_bl); | |
56 | comp->release(); | |
57 | } | |
58 | ||
59 | template <typename I> | |
60 | Context *OpenRequest<I>::handle_v1_detect_header(int *result) { | |
61 | CephContext *cct = m_image_ctx->cct; | |
62 | ldout(cct, 10) << __func__ << ": r=" << *result << dendl; | |
63 | ||
64 | if (*result < 0) { | |
65 | if (*result != -ENOENT) { | |
66 | lderr(cct) << "failed to stat image header: " << cpp_strerror(*result) | |
67 | << dendl; | |
68 | } | |
69 | send_close_image(*result); | |
70 | } else { | |
71 | ldout(cct, 1) << "RBD image format 1 is deprecated. " | |
72 | << "Please copy this image to image format 2." << dendl; | |
73 | ||
74 | m_image_ctx->old_format = true; | |
75 | m_image_ctx->header_oid = util::old_header_name(m_image_ctx->name); | |
76 | m_image_ctx->apply_metadata({}); | |
77 | ||
78 | send_register_watch(); | |
79 | } | |
80 | return nullptr; | |
81 | } | |
82 | ||
83 | template <typename I> | |
84 | void OpenRequest<I>::send_v2_detect_header() { | |
85 | if (m_image_ctx->id.empty()) { | |
86 | CephContext *cct = m_image_ctx->cct; | |
87 | ldout(cct, 10) << this << " " << __func__ << dendl; | |
88 | ||
89 | librados::ObjectReadOperation op; | |
90 | op.stat(NULL, NULL, NULL); | |
91 | ||
92 | using klass = OpenRequest<I>; | |
93 | librados::AioCompletion *comp = | |
94 | create_rados_callback<klass, &klass::handle_v2_detect_header>(this); | |
95 | m_out_bl.clear(); | |
96 | m_image_ctx->md_ctx.aio_operate(util::id_obj_name(m_image_ctx->name), | |
97 | comp, &op, &m_out_bl); | |
98 | comp->release(); | |
99 | } else { | |
100 | send_v2_get_name(); | |
101 | } | |
102 | } | |
103 | ||
104 | template <typename I> | |
105 | Context *OpenRequest<I>::handle_v2_detect_header(int *result) { | |
106 | CephContext *cct = m_image_ctx->cct; | |
107 | ldout(cct, 10) << __func__ << ": r=" << *result << dendl; | |
108 | ||
109 | if (*result == -ENOENT) { | |
110 | send_v1_detect_header(); | |
111 | } else if (*result < 0) { | |
112 | lderr(cct) << "failed to stat v2 image header: " << cpp_strerror(*result) | |
113 | << dendl; | |
114 | send_close_image(*result); | |
115 | } else { | |
116 | m_image_ctx->old_format = false; | |
117 | send_v2_get_id(); | |
118 | } | |
119 | return nullptr; | |
120 | } | |
121 | ||
122 | template <typename I> | |
123 | void OpenRequest<I>::send_v2_get_id() { | |
124 | CephContext *cct = m_image_ctx->cct; | |
125 | ldout(cct, 10) << this << " " << __func__ << dendl; | |
126 | ||
127 | librados::ObjectReadOperation op; | |
128 | cls_client::get_id_start(&op); | |
129 | ||
130 | using klass = OpenRequest<I>; | |
131 | librados::AioCompletion *comp = | |
132 | create_rados_callback<klass, &klass::handle_v2_get_id>(this); | |
133 | m_out_bl.clear(); | |
134 | m_image_ctx->md_ctx.aio_operate(util::id_obj_name(m_image_ctx->name), | |
135 | comp, &op, &m_out_bl); | |
136 | comp->release(); | |
137 | } | |
138 | ||
139 | template <typename I> | |
140 | Context *OpenRequest<I>::handle_v2_get_id(int *result) { | |
141 | CephContext *cct = m_image_ctx->cct; | |
142 | ldout(cct, 10) << __func__ << ": r=" << *result << dendl; | |
143 | ||
144 | if (*result == 0) { | |
145 | bufferlist::iterator it = m_out_bl.begin(); | |
146 | *result = cls_client::get_id_finish(&it, &m_image_ctx->id); | |
147 | } | |
148 | if (*result < 0) { | |
149 | lderr(cct) << "failed to retrieve image id: " << cpp_strerror(*result) | |
150 | << dendl; | |
151 | send_close_image(*result); | |
152 | } else { | |
153 | send_v2_get_immutable_metadata(); | |
154 | } | |
155 | return nullptr; | |
156 | } | |
157 | ||
158 | template <typename I> | |
159 | void OpenRequest<I>::send_v2_get_name() { | |
160 | CephContext *cct = m_image_ctx->cct; | |
161 | ldout(cct, 10) << this << " " << __func__ << dendl; | |
162 | ||
163 | librados::ObjectReadOperation op; | |
164 | cls_client::dir_get_name_start(&op, m_image_ctx->id); | |
165 | ||
166 | using klass = OpenRequest<I>; | |
167 | librados::AioCompletion *comp = create_rados_callback< | |
168 | klass, &klass::handle_v2_get_name>(this); | |
169 | m_out_bl.clear(); | |
170 | m_image_ctx->md_ctx.aio_operate(RBD_DIRECTORY, comp, &op, &m_out_bl); | |
171 | comp->release(); | |
172 | } | |
173 | ||
174 | template <typename I> | |
175 | Context *OpenRequest<I>::handle_v2_get_name(int *result) { | |
176 | CephContext *cct = m_image_ctx->cct; | |
177 | ldout(cct, 10) << __func__ << ": r=" << *result << dendl; | |
178 | ||
179 | if (*result == 0) { | |
180 | bufferlist::iterator it = m_out_bl.begin(); | |
181 | *result = cls_client::dir_get_name_finish(&it, &m_image_ctx->name); | |
182 | } | |
183 | if (*result < 0 && *result != -ENOENT) { | |
184 | lderr(cct) << "failed to retreive name: " | |
185 | << cpp_strerror(*result) << dendl; | |
186 | send_close_image(*result); | |
187 | } else if (*result == -ENOENT) { | |
188 | // image does not exist in directory, look in the trash bin | |
189 | ldout(cct, 10) << "image id " << m_image_ctx->id << " does not exist in " | |
190 | << "rbd directory, searching in rbd trash..." << dendl; | |
191 | send_v2_get_name_from_trash(); | |
192 | } else { | |
193 | send_v2_get_immutable_metadata(); | |
194 | } | |
195 | ||
196 | return nullptr; | |
197 | } | |
198 | ||
199 | template <typename I> | |
200 | void OpenRequest<I>::send_v2_get_name_from_trash() { | |
201 | CephContext *cct = m_image_ctx->cct; | |
202 | ldout(cct, 10) << this << " " << __func__ << dendl; | |
203 | ||
204 | librados::ObjectReadOperation op; | |
205 | cls_client::trash_get_start(&op, m_image_ctx->id); | |
206 | ||
207 | using klass = OpenRequest<I>; | |
208 | librados::AioCompletion *comp = create_rados_callback< | |
209 | klass, &klass::handle_v2_get_name_from_trash>(this); | |
210 | m_out_bl.clear(); | |
211 | m_image_ctx->md_ctx.aio_operate(RBD_TRASH, comp, &op, &m_out_bl); | |
212 | comp->release(); | |
213 | } | |
214 | ||
215 | template <typename I> | |
216 | Context *OpenRequest<I>::handle_v2_get_name_from_trash(int *result) { | |
217 | CephContext *cct = m_image_ctx->cct; | |
218 | ldout(cct, 10) << __func__ << ": r=" << *result << dendl; | |
219 | ||
220 | cls::rbd::TrashImageSpec trash_spec; | |
221 | if (*result == 0) { | |
222 | bufferlist::iterator it = m_out_bl.begin(); | |
223 | *result = cls_client::trash_get_finish(&it, &trash_spec); | |
224 | m_image_ctx->name = trash_spec.name; | |
225 | } | |
226 | if (*result < 0) { | |
227 | if (*result == -EOPNOTSUPP) { | |
228 | *result = -ENOENT; | |
229 | } else if (*result == -ENOENT) { | |
230 | lderr(cct) << "image id " << m_image_ctx->id << " does not exist in rbd " | |
231 | << "trash, failed to retrieve image name: " | |
232 | << cpp_strerror(*result) << dendl; | |
233 | } else { | |
234 | lderr(cct) << "failed to retreive name from trash: " | |
235 | << cpp_strerror(*result) << dendl; | |
236 | } | |
237 | send_close_image(*result); | |
238 | } else { | |
239 | send_v2_get_immutable_metadata(); | |
240 | } | |
241 | ||
242 | return nullptr; | |
243 | } | |
244 | ||
245 | template <typename I> | |
246 | void OpenRequest<I>::send_v2_get_immutable_metadata() { | |
247 | CephContext *cct = m_image_ctx->cct; | |
248 | ldout(cct, 10) << this << " " << __func__ << dendl; | |
249 | ||
250 | m_image_ctx->old_format = false; | |
251 | m_image_ctx->header_oid = util::header_name(m_image_ctx->id); | |
252 | ||
253 | librados::ObjectReadOperation op; | |
254 | cls_client::get_immutable_metadata_start(&op); | |
255 | ||
256 | using klass = OpenRequest<I>; | |
257 | librados::AioCompletion *comp = create_rados_callback< | |
258 | klass, &klass::handle_v2_get_immutable_metadata>(this); | |
259 | m_out_bl.clear(); | |
260 | m_image_ctx->md_ctx.aio_operate(m_image_ctx->header_oid, comp, &op, | |
261 | &m_out_bl); | |
262 | comp->release(); | |
263 | } | |
264 | ||
265 | template <typename I> | |
266 | Context *OpenRequest<I>::handle_v2_get_immutable_metadata(int *result) { | |
267 | CephContext *cct = m_image_ctx->cct; | |
268 | ldout(cct, 10) << __func__ << ": r=" << *result << dendl; | |
269 | ||
270 | if (*result == 0) { | |
271 | bufferlist::iterator it = m_out_bl.begin(); | |
272 | *result = cls_client::get_immutable_metadata_finish( | |
273 | &it, &m_image_ctx->object_prefix, &m_image_ctx->order); | |
274 | } | |
275 | if (*result < 0) { | |
276 | lderr(cct) << "failed to retreive immutable metadata: " | |
277 | << cpp_strerror(*result) << dendl; | |
278 | send_close_image(*result); | |
279 | } else { | |
280 | send_v2_get_stripe_unit_count(); | |
281 | } | |
282 | ||
283 | return nullptr; | |
284 | } | |
285 | ||
286 | template <typename I> | |
287 | void OpenRequest<I>::send_v2_get_stripe_unit_count() { | |
288 | CephContext *cct = m_image_ctx->cct; | |
289 | ldout(cct, 10) << this << " " << __func__ << dendl; | |
290 | ||
291 | librados::ObjectReadOperation op; | |
292 | cls_client::get_stripe_unit_count_start(&op); | |
293 | ||
294 | using klass = OpenRequest<I>; | |
295 | librados::AioCompletion *comp = create_rados_callback< | |
296 | klass, &klass::handle_v2_get_stripe_unit_count>(this); | |
297 | m_out_bl.clear(); | |
298 | m_image_ctx->md_ctx.aio_operate(m_image_ctx->header_oid, comp, &op, | |
299 | &m_out_bl); | |
300 | comp->release(); | |
301 | } | |
302 | ||
303 | template <typename I> | |
304 | Context *OpenRequest<I>::handle_v2_get_stripe_unit_count(int *result) { | |
305 | CephContext *cct = m_image_ctx->cct; | |
306 | ldout(cct, 10) << __func__ << ": r=" << *result << dendl; | |
307 | ||
308 | if (*result == 0) { | |
309 | bufferlist::iterator it = m_out_bl.begin(); | |
310 | *result = cls_client::get_stripe_unit_count_finish( | |
311 | &it, &m_image_ctx->stripe_unit, &m_image_ctx->stripe_count); | |
312 | } | |
313 | ||
314 | if (*result == -ENOEXEC || *result == -EINVAL) { | |
315 | *result = 0; | |
316 | } | |
317 | ||
318 | if (*result < 0) { | |
319 | lderr(cct) << "failed to read striping metadata: " << cpp_strerror(*result) | |
320 | << dendl; | |
321 | send_close_image(*result); | |
322 | return nullptr; | |
323 | } | |
324 | ||
325 | send_v2_get_data_pool(); | |
326 | return nullptr; | |
327 | } | |
328 | ||
329 | template <typename I> | |
330 | void OpenRequest<I>::send_v2_get_data_pool() { | |
331 | CephContext *cct = m_image_ctx->cct; | |
332 | ldout(cct, 10) << this << " " << __func__ << dendl; | |
333 | ||
334 | librados::ObjectReadOperation op; | |
335 | cls_client::get_data_pool_start(&op); | |
336 | ||
337 | using klass = OpenRequest<I>; | |
338 | librados::AioCompletion *comp = create_rados_callback< | |
339 | klass, &klass::handle_v2_get_data_pool>(this); | |
340 | m_out_bl.clear(); | |
341 | m_image_ctx->md_ctx.aio_operate(m_image_ctx->header_oid, comp, &op, | |
342 | &m_out_bl); | |
343 | comp->release(); | |
344 | } | |
345 | ||
346 | template <typename I> | |
347 | Context *OpenRequest<I>::handle_v2_get_data_pool(int *result) { | |
348 | CephContext *cct = m_image_ctx->cct; | |
349 | ldout(cct, 10) << this << " " << __func__ << ": r=" << *result << dendl; | |
350 | ||
351 | int64_t data_pool_id = -1; | |
352 | if (*result == 0) { | |
353 | bufferlist::iterator it = m_out_bl.begin(); | |
354 | *result = cls_client::get_data_pool_finish(&it, &data_pool_id); | |
355 | } else if (*result == -EOPNOTSUPP) { | |
356 | *result = 0; | |
357 | } | |
358 | ||
359 | if (*result < 0) { | |
360 | lderr(cct) << "failed to read data pool: " << cpp_strerror(*result) | |
361 | << dendl; | |
362 | send_close_image(*result); | |
363 | return nullptr; | |
364 | } | |
365 | ||
366 | if (data_pool_id != -1) { | |
367 | librados::Rados rados(m_image_ctx->md_ctx); | |
368 | *result = rados.ioctx_create2(data_pool_id, m_image_ctx->data_ctx); | |
369 | if (*result < 0) { | |
370 | lderr(cct) << "failed to initialize data pool IO context: " | |
371 | << cpp_strerror(*result) << dendl; | |
372 | send_close_image(*result); | |
373 | return nullptr; | |
374 | } | |
375 | } | |
376 | ||
377 | m_image_ctx->init_layout(); | |
378 | send_v2_apply_metadata(); | |
379 | return nullptr; | |
380 | } | |
381 | ||
382 | template <typename I> | |
383 | void OpenRequest<I>::send_v2_apply_metadata() { | |
384 | CephContext *cct = m_image_ctx->cct; | |
385 | ldout(cct, 10) << this << " " << __func__ << ": " | |
386 | << "start_key=" << m_last_metadata_key << dendl; | |
387 | ||
388 | librados::ObjectReadOperation op; | |
389 | cls_client::metadata_list_start(&op, m_last_metadata_key, MAX_METADATA_ITEMS); | |
390 | ||
391 | using klass = OpenRequest<I>; | |
392 | librados::AioCompletion *comp = | |
393 | create_rados_callback<klass, &klass::handle_v2_apply_metadata>(this); | |
394 | m_out_bl.clear(); | |
395 | m_image_ctx->md_ctx.aio_operate(m_image_ctx->header_oid, comp, &op, | |
396 | &m_out_bl); | |
397 | comp->release(); | |
398 | } | |
399 | ||
400 | template <typename I> | |
401 | Context *OpenRequest<I>::handle_v2_apply_metadata(int *result) { | |
402 | CephContext *cct = m_image_ctx->cct; | |
403 | ldout(cct, 10) << this << " " << __func__ << ": r=" << *result << dendl; | |
404 | ||
405 | std::map<std::string, bufferlist> metadata; | |
406 | if (*result == 0) { | |
407 | bufferlist::iterator it = m_out_bl.begin(); | |
408 | *result = cls_client::metadata_list_finish(&it, &metadata); | |
409 | } | |
410 | ||
411 | if (*result == -EOPNOTSUPP || *result == -EIO) { | |
412 | ldout(cct, 10) << "config metadata not supported by OSD" << dendl; | |
413 | } else if (*result < 0) { | |
414 | lderr(cct) << "failed to retrieve metadata: " << cpp_strerror(*result) | |
415 | << dendl; | |
416 | send_close_image(*result); | |
417 | return nullptr; | |
418 | } | |
419 | ||
420 | if (!metadata.empty()) { | |
421 | m_metadata.insert(metadata.begin(), metadata.end()); | |
422 | m_last_metadata_key = metadata.rbegin()->first; | |
423 | if (boost::starts_with(m_last_metadata_key, | |
424 | ImageCtx::METADATA_CONF_PREFIX)) { | |
425 | send_v2_apply_metadata(); | |
426 | return nullptr; | |
427 | } | |
428 | } | |
429 | ||
430 | m_image_ctx->apply_metadata(m_metadata); | |
431 | ||
432 | send_register_watch(); | |
433 | return nullptr; | |
434 | } | |
435 | ||
436 | template <typename I> | |
437 | void OpenRequest<I>::send_register_watch() { | |
438 | m_image_ctx->init(); | |
439 | ||
440 | if (m_image_ctx->read_only) { | |
441 | send_refresh(); | |
442 | return; | |
443 | } | |
444 | ||
445 | CephContext *cct = m_image_ctx->cct; | |
446 | ldout(cct, 10) << this << " " << __func__ << dendl; | |
447 | ||
448 | using klass = OpenRequest<I>; | |
449 | Context *ctx = create_context_callback< | |
450 | klass, &klass::handle_register_watch>(this); | |
451 | m_image_ctx->register_watch(ctx); | |
452 | } | |
453 | ||
454 | template <typename I> | |
455 | Context *OpenRequest<I>::handle_register_watch(int *result) { | |
456 | CephContext *cct = m_image_ctx->cct; | |
457 | ldout(cct, 10) << this << " " << __func__ << ": r=" << *result << dendl; | |
458 | ||
459 | if (*result < 0) { | |
460 | lderr(cct) << "failed to register watch: " << cpp_strerror(*result) | |
461 | << dendl; | |
462 | send_close_image(*result); | |
463 | } else { | |
464 | send_refresh(); | |
465 | } | |
466 | return nullptr; | |
467 | } | |
468 | ||
469 | template <typename I> | |
470 | void OpenRequest<I>::send_refresh() { | |
471 | CephContext *cct = m_image_ctx->cct; | |
472 | ldout(cct, 10) << this << " " << __func__ << dendl; | |
473 | ||
474 | using klass = OpenRequest<I>; | |
475 | RefreshRequest<I> *req = RefreshRequest<I>::create( | |
476 | *m_image_ctx, false, m_skip_open_parent_image, | |
477 | create_context_callback<klass, &klass::handle_refresh>(this)); | |
478 | req->send(); | |
479 | } | |
480 | ||
481 | template <typename I> | |
482 | Context *OpenRequest<I>::handle_refresh(int *result) { | |
483 | CephContext *cct = m_image_ctx->cct; | |
484 | ldout(cct, 10) << __func__ << ": r=" << *result << dendl; | |
485 | ||
486 | if (*result < 0) { | |
487 | lderr(cct) << "failed to refresh image: " << cpp_strerror(*result) | |
488 | << dendl; | |
489 | send_close_image(*result); | |
490 | return nullptr; | |
491 | } else { | |
492 | return send_set_snap(result); | |
493 | } | |
494 | } | |
495 | ||
496 | template <typename I> | |
497 | Context *OpenRequest<I>::send_set_snap(int *result) { | |
498 | if (m_image_ctx->snap_name.empty()) { | |
499 | *result = 0; | |
500 | return m_on_finish; | |
501 | } | |
502 | ||
503 | CephContext *cct = m_image_ctx->cct; | |
504 | ldout(cct, 10) << this << " " << __func__ << dendl; | |
505 | ||
506 | using klass = OpenRequest<I>; | |
507 | SetSnapRequest<I> *req = SetSnapRequest<I>::create( | |
508 | *m_image_ctx, m_image_ctx->snap_namespace, m_image_ctx->snap_name, | |
509 | create_context_callback<klass, &klass::handle_set_snap>(this)); | |
510 | req->send(); | |
511 | return nullptr; | |
512 | } | |
513 | ||
514 | template <typename I> | |
515 | Context *OpenRequest<I>::handle_set_snap(int *result) { | |
516 | CephContext *cct = m_image_ctx->cct; | |
517 | ldout(cct, 10) << __func__ << ": r=" << *result << dendl; | |
518 | ||
519 | if (*result < 0) { | |
520 | lderr(cct) << "failed to set image snapshot: " << cpp_strerror(*result) | |
521 | << dendl; | |
522 | send_close_image(*result); | |
523 | return nullptr; | |
524 | } | |
525 | ||
526 | return m_on_finish; | |
527 | } | |
528 | ||
529 | template <typename I> | |
530 | void OpenRequest<I>::send_close_image(int error_result) { | |
531 | CephContext *cct = m_image_ctx->cct; | |
532 | ldout(cct, 10) << this << " " << __func__ << dendl; | |
533 | ||
534 | m_error_result = error_result; | |
535 | ||
536 | using klass = OpenRequest<I>; | |
537 | Context *ctx = create_context_callback<klass, &klass::handle_close_image>( | |
538 | this); | |
539 | CloseRequest<I> *req = CloseRequest<I>::create(m_image_ctx, ctx); | |
540 | req->send(); | |
541 | } | |
542 | ||
543 | template <typename I> | |
544 | Context *OpenRequest<I>::handle_close_image(int *result) { | |
545 | CephContext *cct = m_image_ctx->cct; | |
546 | ldout(cct, 10) << __func__ << ": r=" << *result << dendl; | |
547 | ||
548 | if (*result < 0) { | |
549 | lderr(cct) << "failed to close image: " << cpp_strerror(*result) << dendl; | |
550 | } | |
551 | if (m_error_result < 0) { | |
552 | *result = m_error_result; | |
553 | } | |
554 | return m_on_finish; | |
555 | } | |
556 | ||
557 | } // namespace image | |
558 | } // namespace librbd | |
559 | ||
560 | template class librbd::image::OpenRequest<librbd::ImageCtx>; |