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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/ceph_context.h" | |
5 | #include "common/debug.h" | |
6 | #include "common/errno.h" | |
7 | #include "common/WorkQueue.h" | |
8 | #include "include/stringify.h" | |
9 | #include "aio_utils.h" | |
10 | #include "watcher/RewatchRequest.h" | |
11 | #include "Watcher.h" | |
12 | ||
13 | #define dout_context g_ceph_context | |
14 | #define dout_subsys ceph_subsys_cephfs_mirror | |
15 | #undef dout_prefix | |
16 | #define dout_prefix *_dout << "cephfs::mirror::Watcher " << __func__ | |
17 | ||
18 | using cephfs::mirror::watcher::RewatchRequest; | |
19 | ||
20 | namespace cephfs { | |
21 | namespace mirror { | |
22 | ||
23 | namespace { | |
24 | ||
25 | struct C_UnwatchAndFlush : public Context { | |
26 | librados::Rados rados; | |
27 | Context *on_finish; | |
28 | bool flushing = false; | |
29 | int ret_val = 0; | |
30 | ||
31 | C_UnwatchAndFlush(librados::IoCtx &ioctx, Context *on_finish) | |
32 | : rados(ioctx), on_finish(on_finish) { | |
33 | } | |
34 | ||
35 | void complete(int r) override { | |
36 | if (ret_val == 0 && r < 0) { | |
37 | ret_val = r; | |
38 | } | |
39 | ||
40 | if (!flushing) { | |
41 | flushing = true; | |
42 | ||
43 | librados::AioCompletion *aio_comp = | |
44 | librados::Rados::aio_create_completion( | |
45 | this, &rados_callback<Context, &Context::complete>); | |
46 | r = rados.aio_watch_flush(aio_comp); | |
47 | ||
48 | ceph_assert(r == 0); | |
49 | aio_comp->release(); | |
50 | return; | |
51 | } | |
52 | ||
53 | // ensure our reference to the RadosClient is released prior | |
54 | // to completing the callback to avoid racing an explicit | |
55 | // librados shutdown | |
56 | Context *ctx = on_finish; | |
57 | r = ret_val; | |
58 | delete this; | |
59 | ||
60 | ctx->complete(r); | |
61 | } | |
62 | ||
63 | void finish(int r) override { | |
64 | } | |
65 | }; | |
66 | ||
67 | } // anonymous namespace | |
68 | ||
69 | Watcher::Watcher(librados::IoCtx &ioctx, std::string_view oid, ContextWQ *work_queue) | |
70 | : m_oid(oid), | |
71 | m_ioctx(ioctx), | |
72 | m_work_queue(work_queue), | |
73 | m_lock(ceph::make_shared_mutex("cephfs::mirror::snap_watcher")), | |
74 | m_state(STATE_IDLE), | |
75 | m_watch_ctx(*this) { | |
76 | } | |
77 | ||
78 | Watcher::~Watcher() { | |
79 | } | |
80 | ||
81 | void Watcher::register_watch(Context *on_finish) { | |
82 | dout(20) << dendl; | |
83 | ||
84 | std::scoped_lock locker(m_lock); | |
85 | m_state = STATE_REGISTERING; | |
86 | ||
87 | on_finish = new C_RegisterWatch(this, on_finish); | |
88 | librados::AioCompletion *aio_comp = | |
89 | librados::Rados::aio_create_completion(on_finish, &rados_callback<Context, &Context::complete>); | |
90 | int r = m_ioctx.aio_watch(m_oid, aio_comp, &m_watch_handle, &m_watch_ctx); | |
91 | ceph_assert(r == 0); | |
92 | aio_comp->release(); | |
93 | } | |
94 | ||
95 | void Watcher::handle_register_watch(int r, Context *on_finish) { | |
96 | dout(20) << ": r=" << r << dendl; | |
97 | ||
98 | bool watch_error = false; | |
99 | Context *unregister_watch_ctx = nullptr; | |
100 | { | |
101 | std::scoped_lock locker(m_lock); | |
102 | ceph_assert(m_state == STATE_REGISTERING); | |
103 | ||
104 | m_state = STATE_IDLE; | |
105 | if (r < 0) { | |
106 | derr << ": failed to register watch: " << cpp_strerror(r) << dendl; | |
107 | m_watch_handle = 0; | |
108 | } | |
109 | ||
110 | if (m_unregister_watch_ctx != nullptr) { | |
111 | std::swap(unregister_watch_ctx, m_unregister_watch_ctx); | |
112 | } else if (r == 0 && m_watch_error) { | |
113 | derr << ": re-registering after watch error" << dendl; | |
114 | m_state = STATE_REGISTERING; | |
115 | watch_error = true; | |
116 | } else { | |
117 | m_watch_blocklisted = (r == -EBLOCKLISTED); | |
118 | } | |
119 | } | |
120 | ||
121 | on_finish->complete(r); | |
122 | if (unregister_watch_ctx != nullptr) { | |
123 | unregister_watch_ctx->complete(0); | |
124 | } else if (watch_error) { | |
125 | rewatch(); | |
126 | } | |
127 | } | |
128 | ||
129 | void Watcher::unregister_watch(Context *on_finish) { | |
130 | dout(20) << dendl; | |
131 | ||
132 | { | |
133 | std::scoped_lock locker(m_lock); | |
134 | if (m_state != STATE_IDLE) { | |
135 | dout(10) << ": delaying unregister -- watch register in progress" << dendl; | |
136 | ceph_assert(m_unregister_watch_ctx == nullptr); | |
137 | m_unregister_watch_ctx = new LambdaContext([this, on_finish](int r) { | |
138 | unregister_watch(on_finish); | |
139 | }); | |
140 | return; | |
141 | } else if (is_registered()) { | |
142 | // watch is registered -- unwatch | |
143 | librados::AioCompletion *aio_comp = | |
144 | librados::Rados::aio_create_completion(new C_UnwatchAndFlush(m_ioctx, on_finish), | |
145 | &rados_callback<Context, &Context::complete>); | |
146 | int r = m_ioctx.aio_unwatch(m_watch_handle, aio_comp); | |
147 | ceph_assert(r == 0); | |
148 | aio_comp->release(); | |
149 | m_watch_handle = 0; | |
150 | m_watch_blocklisted = false; | |
151 | return; | |
152 | } | |
153 | } | |
154 | ||
155 | on_finish->complete(0); | |
156 | } | |
157 | ||
158 | void Watcher::handle_error(uint64_t handle, int err) { | |
159 | derr << ": handle=" << handle << ": " << cpp_strerror(err) << dendl; | |
160 | ||
161 | std::scoped_lock locker(m_lock); | |
162 | m_watch_error = true; | |
163 | ||
164 | if (is_registered()) { | |
165 | m_state = STATE_REWATCHING; | |
166 | if (err == -EBLOCKLISTED) { | |
167 | m_watch_blocklisted = true; | |
168 | } | |
169 | m_work_queue->queue(new LambdaContext([this] { | |
170 | rewatch(); | |
171 | }), 0); | |
172 | } | |
173 | } | |
174 | ||
175 | void Watcher::rewatch() { | |
176 | dout(20) << dendl; | |
177 | ||
178 | Context *unregister_watch_ctx = nullptr; | |
179 | { | |
180 | std::unique_lock locker(m_lock); | |
181 | ceph_assert(m_state == STATE_REWATCHING); | |
182 | ||
183 | if (m_unregister_watch_ctx != nullptr) { | |
184 | m_state = STATE_IDLE; | |
185 | std::swap(unregister_watch_ctx, m_unregister_watch_ctx); | |
186 | } else { | |
187 | m_watch_error = false; | |
188 | Context *ctx = new C_CallbackAdapter<Watcher, &Watcher::handle_rewatch>(this); | |
189 | auto req = RewatchRequest::create(m_ioctx, m_oid, m_lock, | |
190 | &m_watch_ctx, &m_watch_handle, ctx); | |
191 | req->send(); | |
192 | return; | |
193 | } | |
194 | } | |
195 | ||
196 | unregister_watch_ctx->complete(0); | |
197 | } | |
198 | ||
199 | void Watcher::handle_rewatch(int r) { | |
200 | dout(20) << ": r=" << r << dendl; | |
201 | ||
202 | bool watch_error = false; | |
203 | Context *unregister_watch_ctx = nullptr; | |
204 | { | |
205 | std::scoped_lock locker(m_lock); | |
206 | ceph_assert(m_state == STATE_REWATCHING); | |
207 | ||
208 | m_watch_blocklisted = false; | |
209 | if (m_unregister_watch_ctx != nullptr) { | |
210 | dout(10) << ": skipping rewatch -- unregistering" << dendl; | |
211 | m_state = STATE_IDLE; | |
212 | std::swap(unregister_watch_ctx, m_unregister_watch_ctx); | |
213 | } else if (r == -EBLOCKLISTED) { | |
214 | m_watch_blocklisted = true; | |
215 | derr << ": client blocklisted" << dendl; | |
216 | } else if (r == -ENOENT) { | |
217 | dout(5) << ": object " << m_oid << " does not exist" << dendl; | |
218 | } else if (r < 0) { | |
219 | derr << ": failed to rewatch: " << cpp_strerror(r) << dendl; | |
220 | watch_error = true; | |
221 | } else if (m_watch_error) { | |
222 | derr << ": re-registering watch after error" << dendl; | |
223 | watch_error = true; | |
224 | } | |
225 | } | |
226 | ||
227 | if (unregister_watch_ctx != nullptr) { | |
228 | unregister_watch_ctx->complete(0); | |
229 | return; | |
230 | } else if (watch_error) { | |
231 | rewatch(); | |
232 | return; | |
233 | } | |
234 | ||
235 | Context *ctx = new C_CallbackAdapter<Watcher, &Watcher::handle_rewatch_callback>(this); | |
236 | m_work_queue->queue(ctx, r); | |
237 | } | |
238 | ||
239 | void Watcher::handle_rewatch_callback(int r) { | |
240 | dout(10) << ": r=" << r << dendl; | |
241 | handle_rewatch_complete(r); | |
242 | ||
243 | bool watch_error = false; | |
244 | Context *unregister_watch_ctx = nullptr; | |
245 | { | |
246 | std::scoped_lock locker(m_lock); | |
247 | ceph_assert(m_state == STATE_REWATCHING); | |
248 | ||
249 | if (m_unregister_watch_ctx != nullptr) { | |
250 | m_state = STATE_IDLE; | |
251 | std::swap(unregister_watch_ctx, m_unregister_watch_ctx); | |
252 | } else if (r == -EBLOCKLISTED || r == -ENOENT) { | |
253 | m_state = STATE_IDLE; | |
254 | } else if (r < 0 || m_watch_error) { | |
255 | watch_error = true; | |
256 | } else { | |
257 | m_state = STATE_IDLE; | |
258 | } | |
259 | } | |
260 | ||
261 | if (unregister_watch_ctx != nullptr) { | |
262 | unregister_watch_ctx->complete(0); | |
263 | } else if (watch_error) { | |
264 | rewatch(); | |
265 | } | |
266 | } | |
267 | ||
268 | void Watcher::acknowledge_notify(uint64_t notify_id, uint64_t handle, bufferlist &bl) { | |
269 | m_ioctx.notify_ack(m_oid, notify_id, handle, bl); | |
270 | } | |
271 | ||
272 | void Watcher::WatchCtx::handle_notify(uint64_t notify_id, uint64_t handle, | |
273 | uint64_t notifier_id, bufferlist& bl) { | |
274 | dout(20) << ": notify_id=" << notify_id << ", handle=" << handle | |
275 | << ", notifier_id=" << notifier_id << dendl; | |
276 | watcher.handle_notify(notify_id, handle, notifier_id, bl); | |
277 | } | |
278 | ||
279 | void Watcher::WatchCtx::handle_error(uint64_t handle, int err) { | |
280 | dout(20) << dendl; | |
281 | watcher.handle_error(handle, err); | |
282 | } | |
283 | ||
284 | } // namespace mirror | |
285 | } // namespace cephfs |