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11fdf7f2 | 1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
9f95a23c | 2 | // vim: ts=8 sw=2 smarttab ft=cpp |
11fdf7f2 TL |
3 | |
4 | /* | |
5 | * Ceph - scalable distributed file system | |
6 | * | |
7 | * Copyright (C) 2018 Red Hat, Inc. | |
8 | * | |
9 | * This is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License version 2.1, as published by the Free Software | |
12 | * Foundation. See file COPYING. | |
13 | * | |
14 | */ | |
15 | ||
16 | #pragma once | |
17 | ||
9f95a23c TL |
18 | #include <cstdint> |
19 | #include <memory> | |
20 | #include <type_traits> | |
21 | ||
11fdf7f2 | 22 | #include <boost/intrusive/list.hpp> |
9f95a23c TL |
23 | #include "include/rados/librados_fwd.hpp" |
24 | #include "common/async/yield_context.h" | |
25 | ||
11fdf7f2 TL |
26 | #include "services/svc_rados.h" // cant forward declare RGWSI_RADOS::Obj |
27 | ||
9f95a23c TL |
28 | #include "rgw_common.h" |
29 | ||
30 | #include "include/function2.hpp" | |
31 | ||
20effc67 TL |
32 | struct D3nGetObjData; |
33 | ||
11fdf7f2 TL |
34 | namespace rgw { |
35 | ||
36 | struct AioResult { | |
37 | RGWSI_RADOS::Obj obj; | |
38 | uint64_t id = 0; // id allows caller to associate a result with its request | |
39 | bufferlist data; // result buffer for reads | |
40 | int result = 0; | |
9f95a23c TL |
41 | std::aligned_storage_t<3 * sizeof(void*)> user_data; |
42 | ||
43 | AioResult() = default; | |
44 | AioResult(const AioResult&) = delete; | |
45 | AioResult& operator =(const AioResult&) = delete; | |
46 | AioResult(AioResult&&) = delete; | |
47 | AioResult& operator =(AioResult&&) = delete; | |
11fdf7f2 TL |
48 | }; |
49 | struct AioResultEntry : AioResult, boost::intrusive::list_base_hook<> { | |
50 | virtual ~AioResultEntry() {} | |
51 | }; | |
52 | // a list of polymorphic entries that frees them on destruction | |
53 | template <typename T, typename ...Args> | |
54 | struct OwningList : boost::intrusive::list<T, Args...> { | |
55 | OwningList() = default; | |
56 | ~OwningList() { this->clear_and_dispose(std::default_delete<T>{}); } | |
57 | OwningList(OwningList&&) = default; | |
58 | OwningList& operator=(OwningList&&) = default; | |
59 | OwningList(const OwningList&) = delete; | |
60 | OwningList& operator=(const OwningList&) = delete; | |
61 | }; | |
62 | using AioResultList = OwningList<AioResultEntry>; | |
63 | ||
64 | // returns the first error code or 0 if all succeeded | |
65 | inline int check_for_errors(const AioResultList& results) { | |
66 | for (auto& e : results) { | |
67 | if (e.result < 0) { | |
68 | return e.result; | |
69 | } | |
70 | } | |
71 | return 0; | |
72 | } | |
73 | ||
74 | // interface to submit async librados operations and wait on their completions. | |
75 | // each call returns a list of results from prior completions | |
76 | class Aio { | |
77 | public: | |
9f95a23c | 78 | using OpFunc = fu2::unique_function<void(Aio*, AioResult&) &&>; |
11fdf7f2 | 79 | |
9f95a23c | 80 | virtual ~Aio() {} |
11fdf7f2 | 81 | |
9f95a23c TL |
82 | virtual AioResultList get(const RGWSI_RADOS::Obj& obj, |
83 | OpFunc&& f, | |
84 | uint64_t cost, uint64_t id) = 0; | |
85 | virtual void put(AioResult& r) = 0; | |
11fdf7f2 TL |
86 | |
87 | // poll for any ready completions without waiting | |
88 | virtual AioResultList poll() = 0; | |
89 | ||
90 | // return any ready completions. if there are none, wait for the next | |
91 | virtual AioResultList wait() = 0; | |
92 | ||
93 | // wait for all outstanding completions and return their results | |
94 | virtual AioResultList drain() = 0; | |
9f95a23c TL |
95 | |
96 | static OpFunc librados_op(librados::ObjectReadOperation&& op, | |
97 | optional_yield y); | |
98 | static OpFunc librados_op(librados::ObjectWriteOperation&& op, | |
99 | optional_yield y); | |
20effc67 TL |
100 | static OpFunc d3n_cache_op(const DoutPrefixProvider *dpp, optional_yield y, |
101 | off_t read_ofs, off_t read_len, std::string& location); | |
11fdf7f2 TL |
102 | }; |
103 | ||
104 | } // namespace rgw |