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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 "RemotePoolPoller.h" | |
5 | #include "include/ceph_assert.h" | |
6 | #include "common/debug.h" | |
7 | #include "common/errno.h" | |
8 | #include "common/Timer.h" | |
9 | #include "common/WorkQueue.h" | |
10 | #include "cls/rbd/cls_rbd_client.h" | |
11 | #include "librbd/ImageCtx.h" | |
12 | #include "librbd/Utils.h" | |
13 | #include "tools/rbd_mirror/Threads.h" | |
14 | #include "tools/rbd_mirror/Types.h" | |
15 | ||
16 | #define dout_context g_ceph_context | |
17 | #define dout_subsys ceph_subsys_rbd_mirror | |
18 | #undef dout_prefix | |
dc7c3f34 | 19 | #define dout_prefix *_dout << "rbd::mirror::RemotePoolPoller: " << this << " " \ |
9f95a23c TL |
20 | << __func__ << ": " |
21 | ||
22 | namespace rbd { | |
23 | namespace mirror { | |
24 | ||
25 | static const double POLL_INTERVAL_SECONDS = 30; | |
26 | ||
27 | using librbd::util::create_rados_callback; | |
28 | ||
29 | template <typename I> | |
30 | RemotePoolPoller<I>::~RemotePoolPoller() { | |
31 | ceph_assert(m_timer_task == nullptr); | |
32 | } | |
33 | ||
34 | template <typename I> | |
35 | void RemotePoolPoller<I>::init(Context* on_finish) { | |
36 | dout(10) << dendl; | |
37 | ||
38 | ceph_assert(m_state == STATE_INITIALIZING); | |
39 | ceph_assert(m_on_finish == nullptr); | |
40 | m_on_finish = on_finish; | |
41 | ||
42 | get_mirror_uuid(); | |
43 | } | |
44 | ||
45 | template <typename I> | |
46 | void RemotePoolPoller<I>::shut_down(Context* on_finish) { | |
47 | dout(10) << dendl; | |
48 | ||
49 | std::unique_lock locker(m_threads->timer_lock); | |
50 | ceph_assert(m_state == STATE_POLLING); | |
51 | m_state = STATE_SHUTTING_DOWN; | |
52 | ||
53 | if (m_timer_task == nullptr) { | |
54 | // currently executing a poll | |
55 | ceph_assert(m_on_finish == nullptr); | |
56 | m_on_finish = on_finish; | |
57 | return; | |
58 | } | |
59 | ||
60 | m_threads->timer->cancel_event(m_timer_task); | |
61 | m_timer_task = nullptr; | |
62 | m_threads->work_queue->queue(on_finish, 0); | |
63 | } | |
64 | ||
65 | template <typename I> | |
66 | void RemotePoolPoller<I>::get_mirror_uuid() { | |
67 | dout(10) << dendl; | |
68 | ||
69 | librados::ObjectReadOperation op; | |
70 | librbd::cls_client::mirror_uuid_get_start(&op); | |
71 | ||
72 | auto aio_comp = create_rados_callback< | |
73 | RemotePoolPoller<I>, &RemotePoolPoller<I>::handle_get_mirror_uuid>(this); | |
74 | m_out_bl.clear(); | |
75 | int r = m_remote_io_ctx.aio_operate(RBD_MIRRORING, aio_comp, &op, &m_out_bl); | |
76 | ceph_assert(r == 0); | |
77 | aio_comp->release(); | |
78 | } | |
79 | ||
80 | template <typename I> | |
81 | void RemotePoolPoller<I>::handle_get_mirror_uuid(int r) { | |
82 | dout(10) << "r=" << r << dendl; | |
83 | std::string remote_mirror_uuid; | |
84 | if (r >= 0) { | |
85 | auto it = m_out_bl.cbegin(); | |
86 | r = librbd::cls_client::mirror_uuid_get_finish(&it, &remote_mirror_uuid); | |
87 | if (r >= 0 && remote_mirror_uuid.empty()) { | |
88 | r = -ENOENT; | |
89 | } | |
90 | } | |
91 | ||
92 | if (r < 0) { | |
93 | if (r == -ENOENT) { | |
94 | dout(5) << "remote mirror uuid missing" << dendl; | |
95 | } else { | |
96 | derr << "failed to retrieve remote mirror uuid: " << cpp_strerror(r) | |
97 | << dendl; | |
98 | } | |
99 | ||
100 | m_remote_pool_meta.mirror_uuid = ""; | |
101 | } | |
102 | ||
103 | // if we have the mirror uuid, we will poll until shut down | |
104 | if (m_state == STATE_INITIALIZING) { | |
105 | if (r < 0) { | |
106 | schedule_task(r); | |
107 | return; | |
108 | } | |
109 | ||
110 | m_state = STATE_POLLING; | |
111 | } | |
112 | ||
113 | dout(10) << "remote_mirror_uuid=" << remote_mirror_uuid << dendl; | |
114 | if (m_remote_pool_meta.mirror_uuid != remote_mirror_uuid) { | |
115 | m_remote_pool_meta.mirror_uuid = remote_mirror_uuid; | |
116 | m_updated = true; | |
117 | } | |
118 | ||
119 | mirror_peer_ping(); | |
120 | } | |
121 | ||
122 | template <typename I> | |
123 | void RemotePoolPoller<I>::mirror_peer_ping() { | |
124 | dout(10) << dendl; | |
125 | ||
126 | librados::ObjectWriteOperation op; | |
127 | librbd::cls_client::mirror_peer_ping(&op, m_site_name, m_local_mirror_uuid); | |
128 | ||
129 | auto aio_comp = create_rados_callback< | |
130 | RemotePoolPoller<I>, &RemotePoolPoller<I>::handle_mirror_peer_ping>(this); | |
131 | int r = m_remote_io_ctx.aio_operate(RBD_MIRRORING, aio_comp, &op); | |
132 | ceph_assert(r == 0); | |
133 | aio_comp->release(); | |
134 | } | |
135 | ||
136 | template <typename I> | |
137 | void RemotePoolPoller<I>::handle_mirror_peer_ping(int r) { | |
138 | dout(10) << "r=" << r << dendl; | |
139 | ||
140 | if (r == -EOPNOTSUPP) { | |
141 | // older OSD that doesn't support snaphot-based mirroring, so no need | |
142 | // to query remote peers | |
143 | dout(10) << "remote peer does not support snapshot-based mirroring" | |
144 | << dendl; | |
145 | notify_listener(); | |
146 | return; | |
147 | } else if (r < 0) { | |
148 | // we can still see if we can perform a peer list and find outselves | |
149 | derr << "failed to ping remote mirror peer: " << cpp_strerror(r) << dendl; | |
150 | } | |
151 | ||
152 | mirror_peer_list(); | |
153 | } | |
154 | ||
155 | template <typename I> | |
156 | void RemotePoolPoller<I>::mirror_peer_list() { | |
157 | dout(10) << dendl; | |
158 | ||
159 | librados::ObjectReadOperation op; | |
160 | librbd::cls_client::mirror_peer_list_start(&op); | |
161 | ||
162 | auto aio_comp = create_rados_callback< | |
163 | RemotePoolPoller<I>, &RemotePoolPoller<I>::handle_mirror_peer_list>(this); | |
164 | m_out_bl.clear(); | |
165 | int r = m_remote_io_ctx.aio_operate(RBD_MIRRORING, aio_comp, &op, &m_out_bl); | |
166 | ceph_assert(r == 0); | |
167 | aio_comp->release(); | |
168 | } | |
169 | ||
170 | template <typename I> | |
171 | void RemotePoolPoller<I>::handle_mirror_peer_list(int r) { | |
172 | dout(10) << "r=" << r << dendl; | |
173 | ||
174 | std::vector<cls::rbd::MirrorPeer> peers; | |
175 | if (r == 0) { | |
176 | auto iter = m_out_bl.cbegin(); | |
177 | r = librbd::cls_client::mirror_peer_list_finish(&iter, &peers); | |
178 | } | |
179 | ||
180 | if (r < 0) { | |
181 | derr << "failed to retrieve mirror peers: " << cpp_strerror(r) << dendl; | |
182 | } | |
183 | ||
184 | cls::rbd::MirrorPeer* matched_peer = nullptr; | |
185 | for (auto& peer : peers) { | |
dc7c3f34 | 186 | if (peer.mirror_peer_direction == cls::rbd::MIRROR_PEER_DIRECTION_RX) { |
9f95a23c TL |
187 | continue; |
188 | } | |
189 | ||
190 | if (peer.mirror_uuid == m_local_mirror_uuid) { | |
191 | matched_peer = &peer; | |
192 | break; | |
193 | } else if (peer.site_name == m_site_name) { | |
194 | // keep searching in case we hit an exact match by fsid | |
195 | matched_peer = &peer; | |
196 | } | |
197 | } | |
198 | ||
199 | // older OSDs don't support peer ping so we might fail to find a match, | |
200 | // which will prevent snapshot mirroring from functioning | |
201 | std::string remote_mirror_peer_uuid; | |
202 | if (matched_peer != nullptr) { | |
203 | remote_mirror_peer_uuid = matched_peer->uuid; | |
204 | } | |
205 | ||
206 | dout(10) << "remote_mirror_peer_uuid=" << remote_mirror_peer_uuid << dendl; | |
207 | if (m_remote_pool_meta.mirror_peer_uuid != remote_mirror_peer_uuid) { | |
208 | m_remote_pool_meta.mirror_peer_uuid = remote_mirror_peer_uuid; | |
209 | m_updated = true; | |
210 | } | |
211 | ||
212 | notify_listener(); | |
213 | } | |
214 | ||
215 | template <typename I> | |
216 | void RemotePoolPoller<I>::notify_listener() { | |
217 | bool updated = false; | |
218 | std::swap(updated, m_updated); | |
219 | if (updated) { | |
220 | dout(10) << dendl; | |
221 | m_listener.handle_updated(m_remote_pool_meta); | |
222 | } | |
223 | ||
224 | schedule_task(0); | |
225 | } | |
226 | ||
227 | template <typename I> | |
228 | void RemotePoolPoller<I>::schedule_task(int r) { | |
229 | std::unique_lock locker{m_threads->timer_lock}; | |
230 | ||
231 | if (m_state == STATE_POLLING) { | |
232 | dout(10) << dendl; | |
233 | ||
234 | ceph_assert(m_timer_task == nullptr); | |
235 | m_timer_task = new LambdaContext([this](int) { | |
236 | handle_task(); | |
237 | }); | |
238 | ||
239 | m_threads->timer->add_event_after(POLL_INTERVAL_SECONDS, m_timer_task); | |
240 | } | |
241 | ||
242 | // finish init or shut down callback | |
243 | if (m_on_finish != nullptr) { | |
244 | locker.unlock(); | |
245 | Context* on_finish = nullptr; | |
246 | std::swap(on_finish, m_on_finish); | |
247 | on_finish->complete(m_state == STATE_SHUTTING_DOWN ? 0 : r); | |
248 | } | |
249 | } | |
250 | ||
251 | template <typename I> | |
252 | void RemotePoolPoller<I>::handle_task() { | |
253 | dout(10) << dendl; | |
254 | ||
255 | ceph_assert(ceph_mutex_is_locked_by_me(m_threads->timer_lock)); | |
256 | m_timer_task = nullptr; | |
257 | ||
258 | auto ctx = new LambdaContext([this](int) { | |
259 | get_mirror_uuid(); | |
260 | }); | |
261 | m_threads->work_queue->queue(ctx); | |
262 | } | |
263 | ||
264 | } // namespace mirror | |
265 | } // namespace rbd | |
266 | ||
267 | template class rbd::mirror::RemotePoolPoller<librbd::ImageCtx>; |