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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 | #ifndef CEPH_LIBRBD_IO_READ_RESULT_H | |
5 | #define CEPH_LIBRBD_IO_READ_RESULT_H | |
6 | ||
7 | #include "include/int_types.h" | |
8 | #include "include/buffer_fwd.h" | |
9 | #include "include/Context.h" | |
10 | #include "librbd/io/Types.h" | |
11 | #include "osdc/Striper.h" | |
12 | #include <sys/uio.h> | |
13 | #include <boost/variant/variant.hpp> | |
14 | ||
15 | struct CephContext; | |
16 | ||
17 | namespace librbd { | |
18 | namespace io { | |
19 | ||
20 | struct AioCompletion; | |
21 | template <typename> struct ObjectReadRequest; | |
22 | ||
23 | class ReadResult { | |
24 | private: | |
25 | struct C_ReadRequest : public Context { | |
26 | AioCompletion *aio_completion; | |
27 | bufferlist bl; | |
28 | ||
29 | C_ReadRequest(AioCompletion *aio_completion); | |
30 | ||
31 | void finish(int r) override; | |
32 | }; | |
33 | ||
34 | public: | |
35 | ||
36 | struct C_ImageReadRequest : public C_ReadRequest { | |
37 | Extents image_extents; | |
38 | ||
39 | C_ImageReadRequest(AioCompletion *aio_completion, | |
40 | const Extents image_extents) | |
41 | : C_ReadRequest(aio_completion), image_extents(image_extents) { | |
42 | } | |
43 | ||
44 | void finish(int r) override; | |
45 | }; | |
46 | ||
47 | struct C_SparseReadRequestBase : public C_ReadRequest { | |
48 | C_SparseReadRequestBase(AioCompletion *aio_completion) | |
49 | : C_ReadRequest(aio_completion) { | |
50 | } | |
51 | ||
52 | using C_ReadRequest::finish; | |
53 | void finish(ExtentMap &extent_map, const Extents &buffer_extents, | |
54 | uint64_t offset, size_t length, bufferlist &bl, int r); | |
55 | }; | |
56 | ||
57 | template <typename ImageCtxT> | |
58 | struct C_SparseReadRequest : public C_SparseReadRequestBase { | |
59 | ObjectReadRequest<ImageCtxT> *request; | |
60 | ||
61 | C_SparseReadRequest(AioCompletion *aio_completion) | |
62 | : C_SparseReadRequestBase(aio_completion) { | |
63 | } | |
64 | ||
65 | void finish(int r) override { | |
66 | C_SparseReadRequestBase::finish(request->get_extent_map(), | |
67 | request->get_buffer_extents(), | |
68 | request->get_offset(), | |
69 | request->get_length(), request->data(), | |
70 | r); | |
71 | } | |
72 | }; | |
73 | ||
74 | ReadResult(); | |
75 | ReadResult(char *buf, size_t buf_len); | |
76 | ReadResult(const struct iovec *iov, int iov_count); | |
77 | ReadResult(ceph::bufferlist *bl); | |
78 | ||
79 | void set_clip_length(size_t length); | |
80 | void assemble_result(CephContext *cct); | |
81 | ||
82 | private: | |
83 | struct Empty { | |
84 | }; | |
85 | ||
86 | struct Linear { | |
87 | char *buf; | |
88 | size_t buf_len; | |
89 | ||
90 | Linear(char *buf, size_t buf_len) : buf(buf), buf_len(buf_len) { | |
91 | } | |
92 | }; | |
93 | ||
94 | struct Vector { | |
95 | const struct iovec *iov; | |
96 | int iov_count; | |
97 | ||
98 | Vector(const struct iovec *iov, int iov_count) | |
99 | : iov(iov), iov_count(iov_count) { | |
100 | } | |
101 | }; | |
102 | ||
103 | struct Bufferlist { | |
104 | ceph::bufferlist *bl; | |
105 | ||
106 | Bufferlist(ceph::bufferlist *bl) : bl(bl) { | |
107 | } | |
108 | }; | |
109 | ||
110 | typedef boost::variant<Empty, | |
111 | Linear, | |
112 | Vector, | |
113 | Bufferlist> Buffer; | |
114 | struct SetClipLengthVisitor; | |
115 | struct AssembleResultVisitor; | |
116 | ||
117 | Buffer m_buffer; | |
118 | Striper::StripedReadResult m_destriper; | |
119 | ||
120 | }; | |
121 | ||
122 | } // namespace io | |
123 | } // namespace librbd | |
124 | ||
125 | #endif // CEPH_LIBRBD_IO_READ_RESULT_H | |
126 |