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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/managed_lock/AcquireRequest.h" | |
5 | #include "librbd/Watcher.h" | |
6 | #include "cls/lock/cls_lock_client.h" | |
7 | #include "cls/lock/cls_lock_types.h" | |
8 | #include "common/dout.h" | |
9 | #include "common/errno.h" | |
10 | #include "common/WorkQueue.h" | |
11 | #include "include/stringify.h" | |
12 | #include "librbd/ImageCtx.h" | |
13 | #include "librbd/Utils.h" | |
14 | #include "librbd/managed_lock/BreakRequest.h" | |
15 | #include "librbd/managed_lock/GetLockerRequest.h" | |
16 | #include "librbd/managed_lock/Utils.h" | |
17 | ||
18 | #define dout_subsys ceph_subsys_rbd | |
19 | #undef dout_prefix | |
20 | #define dout_prefix *_dout << "librbd::managed_lock::AcquireRequest: " << this \ | |
21 | << " " << __func__ << ": " | |
22 | ||
23 | using std::string; | |
24 | ||
25 | namespace librbd { | |
26 | ||
27 | using librbd::util::detail::C_AsyncCallback; | |
28 | using librbd::util::create_context_callback; | |
29 | using librbd::util::create_rados_callback; | |
30 | ||
31 | namespace managed_lock { | |
32 | ||
33 | template <typename I> | |
34 | AcquireRequest<I>* AcquireRequest<I>::create(librados::IoCtx& ioctx, | |
35 | Watcher *watcher, | |
36 | ContextWQ *work_queue, | |
37 | const string& oid, | |
38 | const string& cookie, | |
39 | bool exclusive, | |
40 | bool blacklist_on_break_lock, | |
41 | uint32_t blacklist_expire_seconds, | |
42 | Context *on_finish) { | |
43 | return new AcquireRequest(ioctx, watcher, work_queue, oid, cookie, | |
44 | exclusive, blacklist_on_break_lock, | |
45 | blacklist_expire_seconds, on_finish); | |
46 | } | |
47 | ||
48 | template <typename I> | |
49 | AcquireRequest<I>::AcquireRequest(librados::IoCtx& ioctx, Watcher *watcher, | |
50 | ContextWQ *work_queue, const string& oid, | |
51 | const string& cookie, bool exclusive, | |
52 | bool blacklist_on_break_lock, | |
53 | uint32_t blacklist_expire_seconds, | |
54 | Context *on_finish) | |
55 | : m_ioctx(ioctx), m_watcher(watcher), | |
56 | m_cct(reinterpret_cast<CephContext *>(m_ioctx.cct())), | |
57 | m_work_queue(work_queue), m_oid(oid), m_cookie(cookie), | |
58 | m_exclusive(exclusive), | |
59 | m_blacklist_on_break_lock(blacklist_on_break_lock), | |
60 | m_blacklist_expire_seconds(blacklist_expire_seconds), | |
61 | m_on_finish(new C_AsyncCallback<ContextWQ>(work_queue, on_finish)) { | |
62 | } | |
63 | ||
64 | template <typename I> | |
65 | AcquireRequest<I>::~AcquireRequest() { | |
66 | } | |
67 | ||
68 | template <typename I> | |
69 | void AcquireRequest<I>::send() { | |
70 | send_get_locker(); | |
71 | } | |
72 | ||
73 | template <typename I> | |
74 | void AcquireRequest<I>::send_get_locker() { | |
75 | ldout(m_cct, 10) << dendl; | |
76 | ||
77 | Context *ctx = create_context_callback< | |
78 | AcquireRequest<I>, &AcquireRequest<I>::handle_get_locker>(this); | |
79 | auto req = GetLockerRequest<I>::create(m_ioctx, m_oid, m_exclusive, | |
80 | &m_locker, ctx); | |
81 | req->send(); | |
82 | } | |
83 | ||
84 | template <typename I> | |
85 | void AcquireRequest<I>::handle_get_locker(int r) { | |
86 | ldout(m_cct, 10) << "r=" << r << dendl; | |
87 | ||
88 | if (r == -ENOENT) { | |
89 | ldout(m_cct, 20) << "no lockers detected" << dendl; | |
90 | m_locker = {}; | |
91 | } else if (r == -EBUSY) { | |
92 | ldout(m_cct, 5) << "incompatible lock detected" << dendl; | |
93 | finish(r); | |
94 | return; | |
95 | } else if (r < 0) { | |
96 | lderr(m_cct) << "failed to retrieve lockers: " << cpp_strerror(r) << dendl; | |
97 | finish(r); | |
98 | return; | |
99 | } | |
100 | ||
101 | send_lock(); | |
102 | } | |
103 | ||
104 | template <typename I> | |
105 | void AcquireRequest<I>::send_lock() { | |
106 | ldout(m_cct, 10) << "entity=client." << m_ioctx.get_instance_id() << ", " | |
107 | << "cookie=" << m_cookie << dendl; | |
108 | ||
109 | librados::ObjectWriteOperation op; | |
110 | rados::cls::lock::lock(&op, RBD_LOCK_NAME, | |
111 | m_exclusive ? LOCK_EXCLUSIVE : LOCK_SHARED, m_cookie, | |
112 | util::get_watcher_lock_tag(), "", utime_t(), 0); | |
113 | ||
114 | using klass = AcquireRequest; | |
115 | librados::AioCompletion *rados_completion = | |
116 | create_rados_callback<klass, &klass::handle_lock>(this); | |
117 | int r = m_ioctx.aio_operate(m_oid, rados_completion, &op); | |
118 | assert(r == 0); | |
119 | rados_completion->release(); | |
120 | } | |
121 | ||
122 | template <typename I> | |
123 | void AcquireRequest<I>::handle_lock(int r) { | |
124 | ldout(m_cct, 10) << "r=" << r << dendl; | |
125 | ||
126 | if (r == 0) { | |
127 | finish(0); | |
128 | return; | |
129 | } else if (r == -EBUSY && m_locker.cookie.empty()) { | |
130 | ldout(m_cct, 5) << "already locked, refreshing locker" << dendl; | |
131 | send_get_locker(); | |
132 | return; | |
133 | } else if (r != -EBUSY) { | |
134 | lderr(m_cct) << "failed to lock: " << cpp_strerror(r) << dendl; | |
135 | finish(r); | |
136 | return; | |
137 | } | |
138 | ||
139 | send_break_lock(); | |
140 | } | |
141 | ||
142 | template <typename I> | |
143 | void AcquireRequest<I>::send_break_lock() { | |
144 | ldout(m_cct, 10) << dendl; | |
145 | ||
146 | Context *ctx = create_context_callback< | |
147 | AcquireRequest<I>, &AcquireRequest<I>::handle_break_lock>(this); | |
148 | auto req = BreakRequest<I>::create( | |
31f18b77 FG |
149 | m_ioctx, m_work_queue, m_oid, m_locker, m_exclusive, |
150 | m_blacklist_on_break_lock, m_blacklist_expire_seconds, false, ctx); | |
7c673cae FG |
151 | req->send(); |
152 | } | |
153 | ||
154 | template <typename I> | |
155 | void AcquireRequest<I>::handle_break_lock(int r) { | |
156 | ldout(m_cct, 10) << "r=" << r << dendl; | |
157 | ||
158 | if (r == -EAGAIN) { | |
159 | ldout(m_cct, 5) << "lock owner is still alive" << dendl; | |
160 | finish(r); | |
161 | return; | |
162 | } else if (r < 0) { | |
163 | lderr(m_cct) << "failed to break lock : " << cpp_strerror(r) << dendl; | |
164 | finish(r); | |
165 | return; | |
166 | } | |
167 | ||
31f18b77 FG |
168 | m_locker = {}; |
169 | send_lock(); | |
7c673cae FG |
170 | } |
171 | ||
172 | template <typename I> | |
173 | void AcquireRequest<I>::finish(int r) { | |
174 | m_on_finish->complete(r); | |
175 | delete this; | |
176 | } | |
177 | ||
178 | } // namespace managed_lock | |
179 | } // namespace librbd | |
180 | ||
181 | template class librbd::managed_lock::AcquireRequest<librbd::ImageCtx>; |