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7c673cae FG |
1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | ||
4 | #include "ImageSync.h" | |
31f18b77 | 5 | #include "InstanceWatcher.h" |
7c673cae FG |
6 | #include "ProgressContext.h" |
7 | #include "common/errno.h" | |
8 | #include "journal/Journaler.h" | |
31f18b77 | 9 | #include "librbd/ExclusiveLock.h" |
7c673cae FG |
10 | #include "librbd/ImageCtx.h" |
11 | #include "librbd/ObjectMap.h" | |
12 | #include "librbd/Utils.h" | |
13 | #include "librbd/journal/Types.h" | |
14 | #include "tools/rbd_mirror/image_sync/ImageCopyRequest.h" | |
b32b8144 | 15 | #include "tools/rbd_mirror/image_sync/MetadataCopyRequest.h" |
7c673cae FG |
16 | #include "tools/rbd_mirror/image_sync/SnapshotCopyRequest.h" |
17 | #include "tools/rbd_mirror/image_sync/SyncPointCreateRequest.h" | |
18 | #include "tools/rbd_mirror/image_sync/SyncPointPruneRequest.h" | |
19 | ||
20 | #define dout_context g_ceph_context | |
21 | #define dout_subsys ceph_subsys_rbd_mirror | |
22 | #undef dout_prefix | |
23 | #define dout_prefix *_dout << "rbd::mirror::ImageSync: " \ | |
24 | << this << " " << __func__ | |
25 | ||
26 | namespace rbd { | |
27 | namespace mirror { | |
28 | ||
29 | using namespace image_sync; | |
28e407b8 | 30 | using librbd::util::create_async_context_callback; |
7c673cae FG |
31 | using librbd::util::create_context_callback; |
32 | using librbd::util::unique_lock_name; | |
33 | ||
34 | template <typename I> | |
35 | ImageSync<I>::ImageSync(I *local_image_ctx, I *remote_image_ctx, | |
36 | SafeTimer *timer, Mutex *timer_lock, | |
37 | const std::string &mirror_uuid, Journaler *journaler, | |
38 | MirrorPeerClientMeta *client_meta, | |
31f18b77 FG |
39 | ContextWQ *work_queue, |
40 | InstanceWatcher<I> *instance_watcher, | |
41 | Context *on_finish, ProgressContext *progress_ctx) | |
7c673cae FG |
42 | : BaseRequest("rbd::mirror::ImageSync", local_image_ctx->cct, on_finish), |
43 | m_local_image_ctx(local_image_ctx), m_remote_image_ctx(remote_image_ctx), | |
44 | m_timer(timer), m_timer_lock(timer_lock), m_mirror_uuid(mirror_uuid), | |
45 | m_journaler(journaler), m_client_meta(client_meta), | |
31f18b77 FG |
46 | m_work_queue(work_queue), m_instance_watcher(instance_watcher), |
47 | m_progress_ctx(progress_ctx), | |
7c673cae FG |
48 | m_lock(unique_lock_name("ImageSync::m_lock", this)) { |
49 | } | |
50 | ||
51 | template <typename I> | |
52 | ImageSync<I>::~ImageSync() { | |
53 | assert(m_snapshot_copy_request == nullptr); | |
54 | assert(m_image_copy_request == nullptr); | |
55 | } | |
56 | ||
57 | template <typename I> | |
58 | void ImageSync<I>::send() { | |
31f18b77 | 59 | send_notify_sync_request(); |
7c673cae FG |
60 | } |
61 | ||
62 | template <typename I> | |
63 | void ImageSync<I>::cancel() { | |
64 | Mutex::Locker locker(m_lock); | |
65 | ||
66 | dout(20) << dendl; | |
67 | ||
68 | m_canceled = true; | |
69 | ||
31f18b77 FG |
70 | if (m_instance_watcher->cancel_sync_request(m_local_image_ctx->id)) { |
71 | return; | |
72 | } | |
73 | ||
7c673cae FG |
74 | if (m_snapshot_copy_request != nullptr) { |
75 | m_snapshot_copy_request->cancel(); | |
76 | } | |
77 | ||
78 | if (m_image_copy_request != nullptr) { | |
79 | m_image_copy_request->cancel(); | |
80 | } | |
81 | } | |
82 | ||
31f18b77 FG |
83 | template <typename I> |
84 | void ImageSync<I>::send_notify_sync_request() { | |
85 | update_progress("NOTIFY_SYNC_REQUEST"); | |
86 | ||
87 | dout(20) << dendl; | |
88 | ||
28e407b8 AA |
89 | m_lock.Lock(); |
90 | if (m_canceled) { | |
91 | m_lock.Unlock(); | |
92 | BaseRequest::finish(-ECANCELED); | |
93 | return; | |
94 | } | |
95 | ||
96 | Context *ctx = create_async_context_callback( | |
97 | m_work_queue, create_context_callback< | |
98 | ImageSync<I>, &ImageSync<I>::handle_notify_sync_request>(this)); | |
31f18b77 | 99 | m_instance_watcher->notify_sync_request(m_local_image_ctx->id, ctx); |
28e407b8 | 100 | m_lock.Unlock(); |
31f18b77 FG |
101 | } |
102 | ||
103 | template <typename I> | |
104 | void ImageSync<I>::handle_notify_sync_request(int r) { | |
105 | dout(20) << ": r=" << r << dendl; | |
106 | ||
28e407b8 AA |
107 | m_lock.Lock(); |
108 | if (r == 0 && m_canceled) { | |
109 | r = -ECANCELED; | |
110 | } | |
111 | m_lock.Unlock(); | |
112 | ||
31f18b77 FG |
113 | if (r < 0) { |
114 | BaseRequest::finish(r); | |
115 | return; | |
116 | } | |
117 | ||
118 | send_prune_catch_up_sync_point(); | |
119 | } | |
120 | ||
7c673cae FG |
121 | template <typename I> |
122 | void ImageSync<I>::send_prune_catch_up_sync_point() { | |
123 | update_progress("PRUNE_CATCH_UP_SYNC_POINT"); | |
124 | ||
125 | if (m_client_meta->sync_points.empty()) { | |
126 | send_create_sync_point(); | |
127 | return; | |
128 | } | |
129 | ||
130 | dout(20) << dendl; | |
131 | ||
132 | // prune will remove sync points with missing snapshots and | |
133 | // ensure we have a maximum of one sync point (in case we | |
134 | // restarted) | |
135 | Context *ctx = create_context_callback< | |
136 | ImageSync<I>, &ImageSync<I>::handle_prune_catch_up_sync_point>(this); | |
137 | SyncPointPruneRequest<I> *request = SyncPointPruneRequest<I>::create( | |
138 | m_remote_image_ctx, false, m_journaler, m_client_meta, ctx); | |
139 | request->send(); | |
140 | } | |
141 | ||
142 | template <typename I> | |
143 | void ImageSync<I>::handle_prune_catch_up_sync_point(int r) { | |
144 | dout(20) << ": r=" << r << dendl; | |
145 | ||
146 | if (r < 0) { | |
147 | derr << ": failed to prune catch-up sync point: " | |
148 | << cpp_strerror(r) << dendl; | |
149 | finish(r); | |
150 | return; | |
151 | } | |
152 | ||
153 | send_create_sync_point(); | |
154 | } | |
155 | ||
156 | template <typename I> | |
157 | void ImageSync<I>::send_create_sync_point() { | |
158 | update_progress("CREATE_SYNC_POINT"); | |
159 | ||
160 | // TODO: when support for disconnecting laggy clients is added, | |
161 | // re-connect and create catch-up sync point | |
162 | if (m_client_meta->sync_points.size() > 0) { | |
163 | send_copy_snapshots(); | |
164 | return; | |
165 | } | |
166 | ||
167 | dout(20) << dendl; | |
168 | ||
169 | Context *ctx = create_context_callback< | |
170 | ImageSync<I>, &ImageSync<I>::handle_create_sync_point>(this); | |
171 | SyncPointCreateRequest<I> *request = SyncPointCreateRequest<I>::create( | |
172 | m_remote_image_ctx, m_mirror_uuid, m_journaler, m_client_meta, ctx); | |
173 | request->send(); | |
174 | } | |
175 | ||
176 | template <typename I> | |
177 | void ImageSync<I>::handle_create_sync_point(int r) { | |
178 | dout(20) << ": r=" << r << dendl; | |
179 | ||
180 | if (r < 0) { | |
181 | derr << ": failed to create sync point: " << cpp_strerror(r) | |
182 | << dendl; | |
183 | finish(r); | |
184 | return; | |
185 | } | |
186 | ||
187 | send_copy_snapshots(); | |
188 | } | |
189 | ||
190 | template <typename I> | |
191 | void ImageSync<I>::send_copy_snapshots() { | |
192 | m_lock.Lock(); | |
193 | if (m_canceled) { | |
194 | m_lock.Unlock(); | |
195 | finish(-ECANCELED); | |
196 | return; | |
197 | } | |
198 | ||
199 | dout(20) << dendl; | |
200 | ||
201 | Context *ctx = create_context_callback< | |
202 | ImageSync<I>, &ImageSync<I>::handle_copy_snapshots>(this); | |
203 | m_snapshot_copy_request = SnapshotCopyRequest<I>::create( | |
204 | m_local_image_ctx, m_remote_image_ctx, &m_snap_map, m_journaler, | |
205 | m_client_meta, m_work_queue, ctx); | |
206 | m_snapshot_copy_request->get(); | |
207 | m_lock.Unlock(); | |
208 | ||
209 | update_progress("COPY_SNAPSHOTS"); | |
210 | ||
211 | m_snapshot_copy_request->send(); | |
212 | } | |
213 | ||
214 | template <typename I> | |
215 | void ImageSync<I>::handle_copy_snapshots(int r) { | |
216 | dout(20) << ": r=" << r << dendl; | |
217 | ||
218 | { | |
219 | Mutex::Locker locker(m_lock); | |
220 | m_snapshot_copy_request->put(); | |
221 | m_snapshot_copy_request = nullptr; | |
222 | if (r == 0 && m_canceled) { | |
223 | r = -ECANCELED; | |
224 | } | |
225 | } | |
226 | ||
227 | if (r == -ECANCELED) { | |
228 | dout(10) << ": snapshot copy canceled" << dendl; | |
229 | finish(r); | |
230 | return; | |
231 | } else if (r < 0) { | |
232 | derr << ": failed to copy snapshot metadata: " << cpp_strerror(r) << dendl; | |
233 | finish(r); | |
234 | return; | |
235 | } | |
236 | ||
237 | send_copy_image(); | |
238 | } | |
239 | ||
240 | template <typename I> | |
241 | void ImageSync<I>::send_copy_image() { | |
242 | m_lock.Lock(); | |
243 | if (m_canceled) { | |
244 | m_lock.Unlock(); | |
245 | finish(-ECANCELED); | |
246 | return; | |
247 | } | |
248 | ||
249 | dout(20) << dendl; | |
250 | ||
251 | Context *ctx = create_context_callback< | |
252 | ImageSync<I>, &ImageSync<I>::handle_copy_image>(this); | |
253 | m_image_copy_request = ImageCopyRequest<I>::create( | |
254 | m_local_image_ctx, m_remote_image_ctx, m_timer, m_timer_lock, | |
255 | m_journaler, m_client_meta, &m_client_meta->sync_points.front(), | |
256 | ctx, m_progress_ctx); | |
257 | m_image_copy_request->get(); | |
258 | m_lock.Unlock(); | |
259 | ||
260 | update_progress("COPY_IMAGE"); | |
261 | ||
262 | m_image_copy_request->send(); | |
263 | } | |
264 | ||
265 | template <typename I> | |
266 | void ImageSync<I>::handle_copy_image(int r) { | |
267 | dout(20) << ": r=" << r << dendl; | |
268 | ||
269 | { | |
270 | Mutex::Locker locker(m_lock); | |
271 | m_image_copy_request->put(); | |
272 | m_image_copy_request = nullptr; | |
273 | if (r == 0 && m_canceled) { | |
274 | r = -ECANCELED; | |
275 | } | |
276 | } | |
277 | ||
278 | if (r == -ECANCELED) { | |
279 | dout(10) << ": image copy canceled" << dendl; | |
280 | finish(r); | |
281 | return; | |
282 | } else if (r < 0) { | |
283 | derr << ": failed to copy image: " << cpp_strerror(r) << dendl; | |
284 | finish(r); | |
285 | return; | |
286 | } | |
287 | ||
288 | send_copy_object_map(); | |
289 | } | |
290 | ||
291 | template <typename I> | |
292 | void ImageSync<I>::send_copy_object_map() { | |
293 | update_progress("COPY_OBJECT_MAP"); | |
294 | ||
31f18b77 | 295 | m_local_image_ctx->owner_lock.get_read(); |
7c673cae FG |
296 | m_local_image_ctx->snap_lock.get_read(); |
297 | if (!m_local_image_ctx->test_features(RBD_FEATURE_OBJECT_MAP, | |
298 | m_local_image_ctx->snap_lock)) { | |
299 | m_local_image_ctx->snap_lock.put_read(); | |
31f18b77 | 300 | m_local_image_ctx->owner_lock.put_read(); |
7c673cae FG |
301 | send_prune_sync_points(); |
302 | return; | |
303 | } | |
304 | ||
305 | assert(m_local_image_ctx->object_map != nullptr); | |
306 | ||
307 | assert(!m_client_meta->sync_points.empty()); | |
308 | librbd::journal::MirrorPeerSyncPoint &sync_point = | |
309 | m_client_meta->sync_points.front(); | |
31f18b77 FG |
310 | auto snap_id_it = m_local_image_ctx->snap_ids.find( |
311 | {cls::rbd::UserSnapshotNamespace(), sync_point.snap_name}); | |
7c673cae FG |
312 | assert(snap_id_it != m_local_image_ctx->snap_ids.end()); |
313 | librados::snap_t snap_id = snap_id_it->second; | |
314 | ||
315 | dout(20) << ": snap_id=" << snap_id << ", " | |
316 | << "snap_name=" << sync_point.snap_name << dendl; | |
317 | ||
31f18b77 FG |
318 | Context *finish_op_ctx = nullptr; |
319 | if (m_local_image_ctx->exclusive_lock != nullptr) { | |
320 | finish_op_ctx = m_local_image_ctx->exclusive_lock->start_op(); | |
321 | } | |
322 | if (finish_op_ctx == nullptr) { | |
323 | derr << ": lost exclusive lock" << dendl; | |
324 | m_local_image_ctx->snap_lock.put_read(); | |
325 | m_local_image_ctx->owner_lock.put_read(); | |
326 | finish(-EROFS); | |
327 | return; | |
328 | } | |
329 | ||
7c673cae FG |
330 | // rollback the object map (copy snapshot object map to HEAD) |
331 | RWLock::WLocker object_map_locker(m_local_image_ctx->object_map_lock); | |
31f18b77 FG |
332 | auto ctx = new FunctionContext([this, finish_op_ctx](int r) { |
333 | handle_copy_object_map(r); | |
334 | finish_op_ctx->complete(0); | |
335 | }); | |
7c673cae FG |
336 | m_local_image_ctx->object_map->rollback(snap_id, ctx); |
337 | m_local_image_ctx->snap_lock.put_read(); | |
31f18b77 | 338 | m_local_image_ctx->owner_lock.put_read(); |
7c673cae FG |
339 | } |
340 | ||
341 | template <typename I> | |
342 | void ImageSync<I>::handle_copy_object_map(int r) { | |
343 | dout(20) << dendl; | |
344 | ||
345 | assert(r == 0); | |
346 | send_refresh_object_map(); | |
347 | } | |
348 | ||
349 | template <typename I> | |
350 | void ImageSync<I>::send_refresh_object_map() { | |
351 | dout(20) << dendl; | |
352 | ||
353 | update_progress("REFRESH_OBJECT_MAP"); | |
354 | ||
355 | Context *ctx = create_context_callback< | |
356 | ImageSync<I>, &ImageSync<I>::handle_refresh_object_map>(this); | |
357 | m_object_map = m_local_image_ctx->create_object_map(CEPH_NOSNAP); | |
358 | m_object_map->open(ctx); | |
359 | } | |
360 | ||
361 | template <typename I> | |
362 | void ImageSync<I>::handle_refresh_object_map(int r) { | |
363 | dout(20) << dendl; | |
364 | ||
365 | assert(r == 0); | |
366 | { | |
367 | RWLock::WLocker snap_locker(m_local_image_ctx->snap_lock); | |
368 | std::swap(m_local_image_ctx->object_map, m_object_map); | |
369 | } | |
370 | delete m_object_map; | |
371 | ||
372 | send_prune_sync_points(); | |
373 | } | |
374 | ||
375 | template <typename I> | |
376 | void ImageSync<I>::send_prune_sync_points() { | |
377 | dout(20) << dendl; | |
378 | ||
379 | update_progress("PRUNE_SYNC_POINTS"); | |
380 | ||
381 | Context *ctx = create_context_callback< | |
382 | ImageSync<I>, &ImageSync<I>::handle_prune_sync_points>(this); | |
383 | SyncPointPruneRequest<I> *request = SyncPointPruneRequest<I>::create( | |
384 | m_remote_image_ctx, true, m_journaler, m_client_meta, ctx); | |
385 | request->send(); | |
386 | } | |
387 | ||
388 | template <typename I> | |
389 | void ImageSync<I>::handle_prune_sync_points(int r) { | |
390 | dout(20) << ": r=" << r << dendl; | |
391 | ||
392 | if (r < 0) { | |
393 | derr << ": failed to prune sync point: " | |
394 | << cpp_strerror(r) << dendl; | |
395 | finish(r); | |
396 | return; | |
397 | } | |
398 | ||
399 | if (!m_client_meta->sync_points.empty()) { | |
400 | send_copy_image(); | |
401 | return; | |
402 | } | |
403 | ||
b32b8144 FG |
404 | send_copy_metadata(); |
405 | } | |
406 | ||
407 | template <typename I> | |
408 | void ImageSync<I>::send_copy_metadata() { | |
409 | dout(20) << dendl; | |
410 | update_progress("COPY_METADATA"); | |
411 | ||
412 | Context *ctx = create_context_callback< | |
413 | ImageSync<I>, &ImageSync<I>::handle_copy_metadata>(this); | |
414 | auto request = MetadataCopyRequest<I>::create( | |
415 | m_local_image_ctx, m_remote_image_ctx, ctx); | |
416 | request->send(); | |
417 | } | |
418 | ||
419 | template <typename I> | |
420 | void ImageSync<I>::handle_copy_metadata(int r) { | |
421 | dout(20) << ": r=" << r << dendl; | |
422 | if (r < 0) { | |
423 | derr << ": failed to copy metadata: " << cpp_strerror(r) << dendl; | |
424 | finish(r); | |
425 | return; | |
426 | } | |
427 | ||
7c673cae FG |
428 | finish(0); |
429 | } | |
430 | ||
431 | template <typename I> | |
432 | void ImageSync<I>::update_progress(const std::string &description) { | |
433 | dout(20) << ": " << description << dendl; | |
434 | ||
435 | if (m_progress_ctx) { | |
436 | m_progress_ctx->update_progress("IMAGE_SYNC/" + description); | |
437 | } | |
438 | } | |
439 | ||
31f18b77 FG |
440 | template <typename I> |
441 | void ImageSync<I>::finish(int r) { | |
442 | dout(20) << ": r=" << r << dendl; | |
443 | ||
444 | m_instance_watcher->notify_sync_complete(m_local_image_ctx->id); | |
445 | BaseRequest::finish(r); | |
446 | } | |
447 | ||
7c673cae FG |
448 | } // namespace mirror |
449 | } // namespace rbd | |
450 | ||
451 | template class rbd::mirror::ImageSync<librbd::ImageCtx>; |