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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/io/AioCompletion.h" | |
5 | #include <errno.h> | |
6 | ||
7 | #include "common/ceph_context.h" | |
8 | #include "common/dout.h" | |
9 | #include "common/errno.h" | |
10 | #include "common/perf_counters.h" | |
11 | #include "common/WorkQueue.h" | |
12 | ||
13 | #include "librbd/ImageCtx.h" | |
14 | #include "librbd/internal.h" | |
15 | #include "librbd/Journal.h" | |
16 | #include "librbd/Types.h" | |
17 | ||
18 | #ifdef WITH_LTTNG | |
19 | #include "tracing/librbd.h" | |
20 | #else | |
21 | #define tracepoint(...) | |
22 | #endif | |
23 | ||
24 | #define dout_subsys ceph_subsys_rbd | |
25 | #undef dout_prefix | |
26 | #define dout_prefix *_dout << "librbd::io::AioCompletion: " << this \ | |
27 | << " " << __func__ << ": " | |
28 | ||
29 | namespace librbd { | |
30 | namespace io { | |
31 | ||
32 | int AioCompletion::wait_for_complete() { | |
33 | tracepoint(librbd, aio_wait_for_complete_enter, this); | |
34 | lock.Lock(); | |
35 | while (state != AIO_STATE_COMPLETE) | |
36 | cond.Wait(lock); | |
37 | lock.Unlock(); | |
38 | tracepoint(librbd, aio_wait_for_complete_exit, 0); | |
39 | return 0; | |
40 | } | |
41 | ||
42 | void AioCompletion::finalize(ssize_t rval) | |
43 | { | |
44 | assert(lock.is_locked()); | |
45 | assert(ictx != nullptr); | |
46 | CephContext *cct = ictx->cct; | |
47 | ||
48 | ldout(cct, 20) << "r=" << rval << dendl; | |
49 | if (rval >= 0 && aio_type == AIO_TYPE_READ) { | |
50 | read_result.assemble_result(cct); | |
51 | } | |
52 | } | |
53 | ||
54 | void AioCompletion::complete() { | |
55 | assert(lock.is_locked()); | |
56 | assert(ictx != nullptr); | |
57 | CephContext *cct = ictx->cct; | |
58 | ||
59 | tracepoint(librbd, aio_complete_enter, this, rval); | |
60 | utime_t elapsed; | |
61 | elapsed = ceph_clock_now() - start_time; | |
62 | switch (aio_type) { | |
63 | case AIO_TYPE_GENERIC: | |
64 | case AIO_TYPE_OPEN: | |
65 | case AIO_TYPE_CLOSE: | |
66 | break; | |
67 | case AIO_TYPE_READ: | |
68 | ictx->perfcounter->tinc(l_librbd_rd_latency, elapsed); break; | |
69 | case AIO_TYPE_WRITE: | |
70 | ictx->perfcounter->tinc(l_librbd_wr_latency, elapsed); break; | |
71 | case AIO_TYPE_DISCARD: | |
72 | ictx->perfcounter->tinc(l_librbd_discard_latency, elapsed); break; | |
73 | case AIO_TYPE_FLUSH: | |
74 | ictx->perfcounter->tinc(l_librbd_aio_flush_latency, elapsed); break; | |
75 | case AIO_TYPE_WRITESAME: | |
76 | ictx->perfcounter->tinc(l_librbd_ws_latency, elapsed); break; | |
77 | case AIO_TYPE_COMPARE_AND_WRITE: | |
78 | ictx->perfcounter->tinc(l_librbd_cmp_latency, elapsed); break; | |
79 | default: | |
80 | lderr(cct) << "completed invalid aio_type: " << aio_type << dendl; | |
81 | break; | |
82 | } | |
83 | ||
84 | // inform the journal that the op has successfully committed | |
85 | if (journal_tid != 0) { | |
86 | assert(ictx->journal != NULL); | |
87 | ictx->journal->commit_io_event(journal_tid, rval); | |
88 | } | |
89 | ||
90 | state = AIO_STATE_CALLBACK; | |
91 | if (complete_cb) { | |
92 | lock.Unlock(); | |
93 | complete_cb(rbd_comp, complete_arg); | |
94 | lock.Lock(); | |
95 | } | |
96 | ||
97 | if (ictx && event_notify && ictx->event_socket.is_valid()) { | |
98 | ictx->completed_reqs_lock.Lock(); | |
99 | ictx->completed_reqs.push_back(&m_xlist_item); | |
100 | ictx->completed_reqs_lock.Unlock(); | |
101 | ictx->event_socket.notify(); | |
102 | } | |
103 | ||
104 | state = AIO_STATE_COMPLETE; | |
105 | cond.Signal(); | |
106 | ||
107 | // note: possible for image to be closed after op marked finished | |
108 | if (async_op.started()) { | |
109 | async_op.finish_op(); | |
110 | } | |
111 | tracepoint(librbd, aio_complete_exit); | |
112 | } | |
113 | ||
114 | void AioCompletion::init_time(ImageCtx *i, aio_type_t t) { | |
115 | Mutex::Locker locker(lock); | |
116 | if (ictx == nullptr) { | |
117 | ictx = i; | |
118 | aio_type = t; | |
119 | start_time = ceph_clock_now(); | |
120 | } | |
121 | } | |
122 | ||
123 | void AioCompletion::start_op(bool ignore_type) { | |
124 | Mutex::Locker locker(lock); | |
125 | assert(ictx != nullptr); | |
126 | assert(!async_op.started()); | |
127 | if (state == AIO_STATE_PENDING && | |
128 | (ignore_type || aio_type != AIO_TYPE_FLUSH)) { | |
129 | async_op.start_op(*ictx); | |
130 | } | |
131 | } | |
132 | ||
133 | void AioCompletion::fail(int r) | |
134 | { | |
135 | lock.Lock(); | |
136 | assert(ictx != nullptr); | |
137 | CephContext *cct = ictx->cct; | |
138 | ||
139 | lderr(cct) << cpp_strerror(r) << dendl; | |
140 | assert(pending_count == 0); | |
141 | rval = r; | |
142 | complete(); | |
143 | put_unlock(); | |
144 | } | |
145 | ||
146 | void AioCompletion::set_request_count(uint32_t count) { | |
147 | lock.Lock(); | |
148 | assert(ictx != nullptr); | |
149 | CephContext *cct = ictx->cct; | |
150 | ||
151 | ldout(cct, 20) << "pending=" << count << dendl; | |
152 | assert(pending_count == 0); | |
153 | pending_count = count; | |
154 | lock.Unlock(); | |
155 | ||
156 | // if no pending requests, completion will fire now | |
157 | unblock(); | |
158 | } | |
159 | ||
160 | void AioCompletion::complete_request(ssize_t r) | |
161 | { | |
162 | lock.Lock(); | |
163 | assert(ictx != nullptr); | |
164 | CephContext *cct = ictx->cct; | |
165 | ||
166 | if (rval >= 0) { | |
167 | if (r < 0 && r != -EEXIST) | |
168 | rval = r; | |
169 | else if (r > 0) | |
170 | rval += r; | |
171 | } | |
172 | assert(pending_count); | |
173 | int count = --pending_count; | |
174 | ||
175 | ldout(cct, 20) << "cb=" << complete_cb << ", " | |
176 | << "pending=" << pending_count << dendl; | |
177 | if (!count && blockers == 0) { | |
178 | finalize(rval); | |
179 | complete(); | |
180 | } | |
181 | put_unlock(); | |
182 | } | |
183 | ||
184 | void AioCompletion::associate_journal_event(uint64_t tid) { | |
185 | Mutex::Locker l(lock); | |
186 | assert(state == AIO_STATE_PENDING); | |
187 | journal_tid = tid; | |
188 | } | |
189 | ||
190 | bool AioCompletion::is_complete() { | |
191 | tracepoint(librbd, aio_is_complete_enter, this); | |
192 | bool done; | |
193 | { | |
194 | Mutex::Locker l(lock); | |
195 | done = this->state == AIO_STATE_COMPLETE; | |
196 | } | |
197 | tracepoint(librbd, aio_is_complete_exit, done); | |
198 | return done; | |
199 | } | |
200 | ||
201 | ssize_t AioCompletion::get_return_value() { | |
202 | tracepoint(librbd, aio_get_return_value_enter, this); | |
203 | lock.Lock(); | |
204 | ssize_t r = rval; | |
205 | lock.Unlock(); | |
206 | tracepoint(librbd, aio_get_return_value_exit, r); | |
207 | return r; | |
208 | } | |
209 | ||
210 | } // namespace io | |
211 | } // namespace librbd |