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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 | #include "librbd/AsyncObjectThrottle.h" | |
4 | #include "common/RWLock.h" | |
5 | #include "common/WorkQueue.h" | |
6 | #include "librbd/AsyncRequest.h" | |
7 | #include "librbd/ImageCtx.h" | |
8 | #include "librbd/Utils.h" | |
9 | ||
10 | namespace librbd | |
11 | { | |
12 | ||
13 | template <typename T> | |
14 | AsyncObjectThrottle<T>::AsyncObjectThrottle( | |
15 | const AsyncRequest<T>* async_request, T &image_ctx, | |
16 | const ContextFactory& context_factory, Context *ctx, | |
17 | ProgressContext *prog_ctx, uint64_t object_no, uint64_t end_object_no) | |
18 | : m_lock(util::unique_lock_name("librbd::AsyncThrottle::m_lock", this)), | |
19 | m_async_request(async_request), m_image_ctx(image_ctx), | |
20 | m_context_factory(context_factory), m_ctx(ctx), m_prog_ctx(prog_ctx), | |
21 | m_object_no(object_no), m_end_object_no(end_object_no), m_current_ops(0), | |
22 | m_ret(0) | |
23 | { | |
24 | } | |
25 | ||
26 | template <typename T> | |
27 | void AsyncObjectThrottle<T>::start_ops(uint64_t max_concurrent) { | |
28 | assert(m_image_ctx.owner_lock.is_locked()); | |
29 | bool complete; | |
30 | { | |
31 | Mutex::Locker l(m_lock); | |
32 | for (uint64_t i = 0; i < max_concurrent; ++i) { | |
33 | start_next_op(); | |
34 | if (m_ret < 0 && m_current_ops == 0) { | |
35 | break; | |
36 | } | |
37 | } | |
38 | complete = (m_current_ops == 0); | |
39 | } | |
40 | if (complete) { | |
41 | // avoid re-entrant callback | |
42 | m_image_ctx.op_work_queue->queue(m_ctx, m_ret); | |
43 | delete this; | |
44 | } | |
45 | } | |
46 | ||
47 | template <typename T> | |
48 | void AsyncObjectThrottle<T>::finish_op(int r) { | |
49 | bool complete; | |
50 | { | |
51 | RWLock::RLocker owner_locker(m_image_ctx.owner_lock); | |
52 | Mutex::Locker locker(m_lock); | |
53 | --m_current_ops; | |
54 | if (r < 0 && r != -ENOENT && m_ret == 0) { | |
55 | m_ret = r; | |
56 | } | |
57 | ||
58 | start_next_op(); | |
59 | complete = (m_current_ops == 0); | |
60 | } | |
61 | if (complete) { | |
62 | m_ctx->complete(m_ret); | |
63 | delete this; | |
64 | } | |
65 | } | |
66 | ||
67 | template <typename T> | |
68 | void AsyncObjectThrottle<T>::start_next_op() { | |
69 | bool done = false; | |
70 | while (!done) { | |
71 | if (m_async_request != NULL && m_async_request->is_canceled() && | |
72 | m_ret == 0) { | |
73 | // allow in-flight ops to complete, but don't start new ops | |
74 | m_ret = -ERESTART; | |
75 | return; | |
76 | } else if (m_ret != 0 || m_object_no >= m_end_object_no) { | |
77 | return; | |
78 | } | |
79 | ||
80 | uint64_t ono = m_object_no++; | |
81 | C_AsyncObjectThrottle<T> *ctx = m_context_factory(*this, ono); | |
82 | ||
83 | int r = ctx->send(); | |
84 | if (r < 0) { | |
85 | m_ret = r; | |
86 | delete ctx; | |
87 | return; | |
88 | } else if (r > 0) { | |
89 | // op completed immediately | |
90 | delete ctx; | |
91 | } else { | |
92 | ++m_current_ops; | |
93 | done = true; | |
94 | } | |
95 | if (m_prog_ctx != NULL) { | |
96 | m_prog_ctx->update_progress(ono, m_end_object_no); | |
97 | } | |
98 | } | |
99 | } | |
100 | ||
101 | } // namespace librbd | |
102 | ||
103 | #ifndef TEST_F | |
104 | template class librbd::AsyncObjectThrottle<librbd::ImageCtx>; | |
105 | #endif |