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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 "SnapshotCreateRequest.h" | |
5 | #include "common/errno.h" | |
6 | #include "cls/rbd/cls_rbd_client.h" | |
7 | #include "cls/rbd/cls_rbd_types.h" | |
31f18b77 | 8 | #include "librbd/ExclusiveLock.h" |
7c673cae FG |
9 | #include "librbd/ObjectMap.h" |
10 | #include "librbd/Operations.h" | |
11 | #include "librbd/Utils.h" | |
12 | #include "osdc/Striper.h" | |
13 | ||
14 | #define dout_context g_ceph_context | |
15 | #define dout_subsys ceph_subsys_rbd_mirror | |
16 | #undef dout_prefix | |
17 | #define dout_prefix *_dout << "rbd::mirror::image_sync::SnapshotCreateRequest: " \ | |
18 | << this << " " << __func__ | |
19 | ||
20 | namespace rbd { | |
21 | namespace mirror { | |
22 | namespace image_sync { | |
23 | ||
24 | using librbd::util::create_context_callback; | |
25 | using librbd::util::create_rados_callback; | |
26 | ||
27 | template <typename I> | |
28 | SnapshotCreateRequest<I>::SnapshotCreateRequest(I *local_image_ctx, | |
29 | const std::string &snap_name, | |
30 | const cls::rbd::SnapshotNamespace &snap_namespace, | |
31 | uint64_t size, | |
32 | const librbd::ParentSpec &spec, | |
33 | uint64_t parent_overlap, | |
34 | Context *on_finish) | |
35 | : m_local_image_ctx(local_image_ctx), m_snap_name(snap_name), | |
36 | m_snap_namespace(snap_namespace), m_size(size), | |
37 | m_parent_spec(spec), m_parent_overlap(parent_overlap), | |
38 | m_on_finish(on_finish) { | |
39 | } | |
40 | ||
41 | template <typename I> | |
42 | void SnapshotCreateRequest<I>::send() { | |
43 | send_set_size(); | |
44 | } | |
45 | ||
46 | template <typename I> | |
47 | void SnapshotCreateRequest<I>::send_set_size() { | |
48 | m_local_image_ctx->snap_lock.get_read(); | |
49 | if (m_local_image_ctx->size == m_size) { | |
50 | m_local_image_ctx->snap_lock.put_read(); | |
51 | send_remove_parent(); | |
52 | return; | |
53 | } | |
54 | m_local_image_ctx->snap_lock.put_read(); | |
55 | ||
56 | dout(20) << dendl; | |
57 | ||
58 | // Change the image size on disk so that the snapshot picks up | |
59 | // the expected size. We can do this because the last snapshot | |
60 | // we process is the sync snapshot which was created to match the | |
61 | // image size. We also don't need to worry about trimming because | |
62 | // we track the highest possible object number within the sync record | |
63 | librados::ObjectWriteOperation op; | |
64 | librbd::cls_client::set_size(&op, m_size); | |
65 | ||
31f18b77 FG |
66 | auto finish_op_ctx = start_local_op(); |
67 | if (finish_op_ctx == nullptr) { | |
68 | derr << ": lost exclusive lock" << dendl; | |
69 | finish(-EROFS); | |
70 | return; | |
71 | } | |
72 | ||
73 | auto ctx = new FunctionContext([this, finish_op_ctx](int r) { | |
74 | handle_set_size(r); | |
75 | finish_op_ctx->complete(0); | |
76 | }); | |
77 | librados::AioCompletion *comp = create_rados_callback(ctx); | |
7c673cae FG |
78 | int r = m_local_image_ctx->md_ctx.aio_operate(m_local_image_ctx->header_oid, |
79 | comp, &op); | |
80 | assert(r == 0); | |
81 | comp->release(); | |
82 | } | |
83 | ||
84 | template <typename I> | |
85 | void SnapshotCreateRequest<I>::handle_set_size(int r) { | |
86 | dout(20) << ": r=" << r << dendl; | |
87 | ||
88 | if (r < 0) { | |
89 | derr << ": failed to update image size '" << m_snap_name << "': " | |
90 | << cpp_strerror(r) << dendl; | |
91 | finish(r); | |
92 | return; | |
93 | } | |
94 | ||
95 | { | |
96 | // adjust in-memory image size now that it's updated on disk | |
97 | RWLock::WLocker snap_locker(m_local_image_ctx->snap_lock); | |
98 | m_local_image_ctx->size = m_size; | |
99 | } | |
100 | ||
101 | send_remove_parent(); | |
102 | } | |
103 | ||
104 | template <typename I> | |
105 | void SnapshotCreateRequest<I>::send_remove_parent() { | |
106 | m_local_image_ctx->parent_lock.get_read(); | |
107 | if (m_local_image_ctx->parent_md.spec.pool_id == -1 || | |
108 | m_local_image_ctx->parent_md.spec == m_parent_spec) { | |
109 | m_local_image_ctx->parent_lock.put_read(); | |
110 | send_set_parent(); | |
111 | return; | |
112 | } | |
113 | m_local_image_ctx->parent_lock.put_read(); | |
114 | ||
115 | dout(20) << dendl; | |
116 | ||
117 | librados::ObjectWriteOperation op; | |
118 | librbd::cls_client::remove_parent(&op); | |
119 | ||
31f18b77 FG |
120 | auto finish_op_ctx = start_local_op(); |
121 | if (finish_op_ctx == nullptr) { | |
122 | derr << ": lost exclusive lock" << dendl; | |
123 | finish(-EROFS); | |
124 | return; | |
125 | } | |
126 | ||
127 | auto ctx = new FunctionContext([this, finish_op_ctx](int r) { | |
128 | handle_remove_parent(r); | |
129 | finish_op_ctx->complete(0); | |
130 | }); | |
131 | librados::AioCompletion *comp = create_rados_callback(ctx); | |
7c673cae FG |
132 | int r = m_local_image_ctx->md_ctx.aio_operate(m_local_image_ctx->header_oid, |
133 | comp, &op); | |
134 | assert(r == 0); | |
135 | comp->release(); | |
136 | } | |
137 | ||
138 | template <typename I> | |
139 | void SnapshotCreateRequest<I>::handle_remove_parent(int r) { | |
140 | dout(20) << ": r=" << r << dendl; | |
141 | ||
142 | if (r < 0) { | |
143 | derr << ": failed to remove parent '" << m_snap_name << "': " | |
144 | << cpp_strerror(r) << dendl; | |
145 | finish(r); | |
146 | return; | |
147 | } | |
148 | ||
149 | { | |
150 | // adjust in-memory parent now that it's updated on disk | |
151 | RWLock::WLocker parent_locker(m_local_image_ctx->parent_lock); | |
152 | m_local_image_ctx->parent_md.spec = {}; | |
153 | m_local_image_ctx->parent_md.overlap = 0; | |
154 | } | |
155 | ||
156 | send_set_parent(); | |
157 | } | |
158 | ||
159 | template <typename I> | |
160 | void SnapshotCreateRequest<I>::send_set_parent() { | |
161 | m_local_image_ctx->parent_lock.get_read(); | |
162 | if (m_local_image_ctx->parent_md.spec == m_parent_spec && | |
163 | m_local_image_ctx->parent_md.overlap == m_parent_overlap) { | |
164 | m_local_image_ctx->parent_lock.put_read(); | |
165 | send_snap_create(); | |
166 | return; | |
167 | } | |
168 | m_local_image_ctx->parent_lock.put_read(); | |
169 | ||
170 | dout(20) << dendl; | |
171 | ||
172 | librados::ObjectWriteOperation op; | |
173 | librbd::cls_client::set_parent(&op, m_parent_spec, m_parent_overlap); | |
174 | ||
31f18b77 FG |
175 | auto finish_op_ctx = start_local_op(); |
176 | if (finish_op_ctx == nullptr) { | |
177 | derr << ": lost exclusive lock" << dendl; | |
178 | finish(-EROFS); | |
179 | return; | |
180 | } | |
181 | ||
182 | auto ctx = new FunctionContext([this, finish_op_ctx](int r) { | |
183 | handle_set_parent(r); | |
184 | finish_op_ctx->complete(0); | |
185 | }); | |
186 | librados::AioCompletion *comp = create_rados_callback(ctx); | |
7c673cae FG |
187 | int r = m_local_image_ctx->md_ctx.aio_operate(m_local_image_ctx->header_oid, |
188 | comp, &op); | |
189 | assert(r == 0); | |
190 | comp->release(); | |
191 | } | |
192 | ||
193 | template <typename I> | |
194 | void SnapshotCreateRequest<I>::handle_set_parent(int r) { | |
195 | dout(20) << ": r=" << r << dendl; | |
196 | ||
197 | if (r < 0) { | |
198 | derr << ": failed to set parent '" << m_snap_name << "': " | |
199 | << cpp_strerror(r) << dendl; | |
200 | finish(r); | |
201 | return; | |
202 | } | |
203 | ||
204 | { | |
205 | // adjust in-memory parent now that it's updated on disk | |
206 | RWLock::WLocker parent_locker(m_local_image_ctx->parent_lock); | |
207 | m_local_image_ctx->parent_md.spec = m_parent_spec; | |
208 | m_local_image_ctx->parent_md.overlap = m_parent_overlap; | |
209 | } | |
210 | ||
211 | send_snap_create(); | |
212 | } | |
213 | ||
214 | template <typename I> | |
215 | void SnapshotCreateRequest<I>::send_snap_create() { | |
216 | dout(20) << ": snap_name=" << m_snap_name << dendl; | |
217 | ||
31f18b77 FG |
218 | auto finish_op_ctx = start_local_op(); |
219 | if (finish_op_ctx == nullptr) { | |
220 | derr << ": lost exclusive lock" << dendl; | |
221 | finish(-EROFS); | |
222 | return; | |
223 | } | |
224 | ||
225 | auto ctx = new FunctionContext([this, finish_op_ctx](int r) { | |
226 | handle_snap_create(r); | |
227 | finish_op_ctx->complete(0); | |
228 | }); | |
7c673cae FG |
229 | RWLock::RLocker owner_locker(m_local_image_ctx->owner_lock); |
230 | m_local_image_ctx->operations->execute_snap_create(m_snap_namespace, | |
231 | m_snap_name.c_str(), | |
232 | ctx, | |
233 | 0U, true); | |
234 | } | |
235 | ||
236 | template <typename I> | |
237 | void SnapshotCreateRequest<I>::handle_snap_create(int r) { | |
238 | dout(20) << ": r=" << r << dendl; | |
239 | ||
240 | if (r < 0) { | |
241 | derr << ": failed to create snapshot '" << m_snap_name << "': " | |
242 | << cpp_strerror(r) << dendl; | |
243 | finish(r); | |
244 | return; | |
245 | } | |
246 | ||
247 | send_create_object_map(); | |
248 | } | |
249 | template <typename I> | |
250 | void SnapshotCreateRequest<I>::send_create_object_map() { | |
251 | ||
252 | if (!m_local_image_ctx->test_features(RBD_FEATURE_OBJECT_MAP)) { | |
253 | finish(0); | |
254 | return; | |
255 | } | |
256 | ||
257 | m_local_image_ctx->snap_lock.get_read(); | |
31f18b77 FG |
258 | auto snap_it = m_local_image_ctx->snap_ids.find( |
259 | {cls::rbd::UserSnapshotNamespace(), m_snap_name}); | |
7c673cae FG |
260 | if (snap_it == m_local_image_ctx->snap_ids.end()) { |
261 | derr << ": failed to locate snap: " << m_snap_name << dendl; | |
262 | m_local_image_ctx->snap_lock.put_read(); | |
263 | finish(-ENOENT); | |
264 | return; | |
265 | } | |
266 | librados::snap_t local_snap_id = snap_it->second; | |
267 | m_local_image_ctx->snap_lock.put_read(); | |
268 | ||
269 | std::string object_map_oid(librbd::ObjectMap<>::object_map_name( | |
270 | m_local_image_ctx->id, local_snap_id)); | |
271 | uint64_t object_count = Striper::get_num_objects(m_local_image_ctx->layout, | |
272 | m_size); | |
273 | dout(20) << ": " | |
274 | << "object_map_oid=" << object_map_oid << ", " | |
275 | << "object_count=" << object_count << dendl; | |
276 | ||
277 | // initialize an empty object map of the correct size (object sync | |
278 | // will populate the object map) | |
279 | librados::ObjectWriteOperation op; | |
280 | librbd::cls_client::object_map_resize(&op, object_count, OBJECT_NONEXISTENT); | |
281 | ||
31f18b77 FG |
282 | auto finish_op_ctx = start_local_op(); |
283 | if (finish_op_ctx == nullptr) { | |
284 | derr << ": lost exclusive lock" << dendl; | |
285 | finish(-EROFS); | |
286 | return; | |
287 | } | |
288 | ||
289 | auto ctx = new FunctionContext([this, finish_op_ctx](int r) { | |
290 | handle_create_object_map(r); | |
291 | finish_op_ctx->complete(0); | |
292 | }); | |
293 | librados::AioCompletion *comp = create_rados_callback(ctx); | |
7c673cae FG |
294 | int r = m_local_image_ctx->md_ctx.aio_operate(object_map_oid, comp, &op); |
295 | assert(r == 0); | |
296 | comp->release(); | |
297 | } | |
298 | ||
299 | template <typename I> | |
300 | void SnapshotCreateRequest<I>::handle_create_object_map(int r) { | |
301 | dout(20) << ": r=" << r << dendl; | |
302 | ||
303 | if (r < 0) { | |
304 | derr << ": failed to create object map: " << cpp_strerror(r) | |
305 | << dendl; | |
306 | finish(r); | |
307 | return; | |
308 | } | |
309 | ||
310 | finish(0); | |
311 | } | |
312 | ||
31f18b77 FG |
313 | template <typename I> |
314 | Context *SnapshotCreateRequest<I>::start_local_op() { | |
315 | RWLock::RLocker owner_locker(m_local_image_ctx->owner_lock); | |
316 | if (m_local_image_ctx->exclusive_lock == nullptr) { | |
317 | return nullptr; | |
318 | } | |
319 | return m_local_image_ctx->exclusive_lock->start_op(); | |
320 | } | |
321 | ||
7c673cae FG |
322 | template <typename I> |
323 | void SnapshotCreateRequest<I>::finish(int r) { | |
324 | dout(20) << ": r=" << r << dendl; | |
325 | ||
326 | m_on_finish->complete(r); | |
327 | delete this; | |
328 | } | |
329 | ||
330 | } // namespace image_sync | |
331 | } // namespace mirror | |
332 | } // namespace rbd | |
333 | ||
334 | template class rbd::mirror::image_sync::SnapshotCreateRequest<librbd::ImageCtx>; |