1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
|
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_LIBRBD_IO_OBJECT_DISPATCH_SPEC_H
#define CEPH_LIBRBD_IO_OBJECT_DISPATCH_SPEC_H
#include "include/int_types.h"
#include "include/buffer.h"
#include "include/Context.h"
#include "include/rados/librados.hpp"
#include "common/zipkin_trace.h"
#include "librbd/Types.h"
#include "librbd/io/Types.h"
#include <boost/variant/variant.hpp>
namespace librbd {
namespace io {
struct ObjectDispatcherInterface;
struct ObjectDispatchSpec {
private:
// helper to avoid extra heap allocation per object IO
struct C_Dispatcher : public Context {
ObjectDispatchSpec* object_dispatch_spec;
Context* on_finish;
C_Dispatcher(ObjectDispatchSpec* object_dispatch_spec, Context* on_finish)
: object_dispatch_spec(object_dispatch_spec), on_finish(on_finish) {
}
void complete(int r) override;
void finish(int r) override;
};
public:
struct RequestBase {
uint64_t object_no;
RequestBase(uint64_t object_no)
: object_no(object_no) {
}
};
struct ReadRequest : public RequestBase {
ReadExtents* extents;
int read_flags;
uint64_t* version;
ReadRequest(uint64_t object_no, ReadExtents* extents, int read_flags,
uint64_t* version)
: RequestBase(object_no), extents(extents), read_flags(read_flags),
version(version) {
}
};
struct WriteRequestBase : public RequestBase {
uint64_t object_off;
uint64_t journal_tid;
WriteRequestBase(uint64_t object_no, uint64_t object_off,
uint64_t journal_tid)
: RequestBase(object_no), object_off(object_off),
journal_tid(journal_tid) {
}
};
struct DiscardRequest : public WriteRequestBase {
uint64_t object_len;
int discard_flags;
DiscardRequest(uint64_t object_no, uint64_t object_off, uint64_t object_len,
int discard_flags, uint64_t journal_tid)
: WriteRequestBase(object_no, object_off, journal_tid),
object_len(object_len), discard_flags(discard_flags) {
}
};
struct WriteRequest : public WriteRequestBase {
ceph::bufferlist data;
int write_flags;
std::optional<uint64_t> assert_version;
WriteRequest(uint64_t object_no, uint64_t object_off,
ceph::bufferlist&& data, int write_flags,
std::optional<uint64_t> assert_version, uint64_t journal_tid)
: WriteRequestBase(object_no, object_off, journal_tid),
data(std::move(data)), write_flags(write_flags),
assert_version(assert_version) {
}
};
struct WriteSameRequest : public WriteRequestBase {
uint64_t object_len;
LightweightBufferExtents buffer_extents;
ceph::bufferlist data;
WriteSameRequest(uint64_t object_no, uint64_t object_off,
uint64_t object_len,
LightweightBufferExtents&& buffer_extents,
ceph::bufferlist&& data, uint64_t journal_tid)
: WriteRequestBase(object_no, object_off, journal_tid),
object_len(object_len), buffer_extents(std::move(buffer_extents)),
data(std::move(data)) {
}
};
struct CompareAndWriteRequest : public WriteRequestBase {
ceph::bufferlist cmp_data;
ceph::bufferlist data;
uint64_t* mismatch_offset;
CompareAndWriteRequest(uint64_t object_no, uint64_t object_off,
ceph::bufferlist&& cmp_data, ceph::bufferlist&& data,
uint64_t* mismatch_offset,
uint64_t journal_tid)
: WriteRequestBase(object_no, object_off, journal_tid),
cmp_data(std::move(cmp_data)), data(std::move(data)),
mismatch_offset(mismatch_offset) {
}
};
struct FlushRequest {
FlushSource flush_source;
uint64_t journal_tid;
FlushRequest(FlushSource flush_source, uint64_t journal_tid)
: flush_source(flush_source), journal_tid(journal_tid) {
}
};
struct ListSnapsRequest : public RequestBase {
Extents extents;
SnapIds snap_ids;
int list_snaps_flags;
SnapshotDelta* snapshot_delta;
ListSnapsRequest(uint64_t object_no, Extents&& extents,
SnapIds&& snap_ids, int list_snaps_flags,
SnapshotDelta* snapshot_delta)
: RequestBase(object_no), extents(std::move(extents)),
snap_ids(std::move(snap_ids)),list_snaps_flags(list_snaps_flags),
snapshot_delta(snapshot_delta) {
}
};
typedef boost::variant<ReadRequest,
DiscardRequest,
WriteRequest,
WriteSameRequest,
CompareAndWriteRequest,
FlushRequest,
ListSnapsRequest> Request;
C_Dispatcher dispatcher_ctx;
ObjectDispatcherInterface* object_dispatcher;
ObjectDispatchLayer dispatch_layer;
int object_dispatch_flags = 0;
DispatchResult dispatch_result = DISPATCH_RESULT_INVALID;
Request request;
IOContext io_context;
int op_flags;
ZTracer::Trace parent_trace;
template <typename ImageCtxT>
static ObjectDispatchSpec* create_read(
ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
uint64_t object_no, ReadExtents* extents, IOContext io_context,
int op_flags, int read_flags, const ZTracer::Trace &parent_trace,
uint64_t* version, Context* on_finish) {
return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
object_dispatch_layer,
ReadRequest{object_no, extents,
read_flags, version},
io_context, op_flags, parent_trace,
on_finish);
}
template <typename ImageCtxT>
static ObjectDispatchSpec* create_discard(
ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
uint64_t object_no, uint64_t object_off, uint64_t object_len,
IOContext io_context, int discard_flags, uint64_t journal_tid,
const ZTracer::Trace &parent_trace, Context *on_finish) {
return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
object_dispatch_layer,
DiscardRequest{object_no, object_off,
object_len, discard_flags,
journal_tid},
io_context, 0, parent_trace, on_finish);
}
template <typename ImageCtxT>
static ObjectDispatchSpec* create_write(
ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
uint64_t object_no, uint64_t object_off, ceph::bufferlist&& data,
IOContext io_context, int op_flags, int write_flags,
std::optional<uint64_t> assert_version, uint64_t journal_tid,
const ZTracer::Trace &parent_trace, Context *on_finish) {
return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
object_dispatch_layer,
WriteRequest{object_no, object_off,
std::move(data), write_flags,
assert_version, journal_tid},
io_context, op_flags, parent_trace,
on_finish);
}
template <typename ImageCtxT>
static ObjectDispatchSpec* create_write_same(
ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
uint64_t object_no, uint64_t object_off, uint64_t object_len,
LightweightBufferExtents&& buffer_extents, ceph::bufferlist&& data,
IOContext io_context, int op_flags, uint64_t journal_tid,
const ZTracer::Trace &parent_trace, Context *on_finish) {
return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
object_dispatch_layer,
WriteSameRequest{object_no, object_off,
object_len,
std::move(buffer_extents),
std::move(data),
journal_tid},
io_context, op_flags, parent_trace,
on_finish);
}
template <typename ImageCtxT>
static ObjectDispatchSpec* create_compare_and_write(
ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
uint64_t object_no, uint64_t object_off, ceph::bufferlist&& cmp_data,
ceph::bufferlist&& write_data, IOContext io_context,
uint64_t *mismatch_offset, int op_flags, uint64_t journal_tid,
const ZTracer::Trace &parent_trace, Context *on_finish) {
return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
object_dispatch_layer,
CompareAndWriteRequest{object_no,
object_off,
std::move(cmp_data),
std::move(write_data),
mismatch_offset,
journal_tid},
io_context, op_flags, parent_trace,
on_finish);
}
template <typename ImageCtxT>
static ObjectDispatchSpec* create_flush(
ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
FlushSource flush_source, uint64_t journal_tid,
const ZTracer::Trace &parent_trace, Context *on_finish) {
return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
object_dispatch_layer,
FlushRequest{flush_source, journal_tid},
{}, 0, parent_trace, on_finish);
}
template <typename ImageCtxT>
static ObjectDispatchSpec* create_list_snaps(
ImageCtxT* image_ctx, ObjectDispatchLayer object_dispatch_layer,
uint64_t object_no, Extents&& extents, SnapIds&& snap_ids,
int list_snaps_flags, const ZTracer::Trace &parent_trace,
SnapshotDelta* snapshot_delta, Context* on_finish) {
return new ObjectDispatchSpec(image_ctx->io_object_dispatcher,
object_dispatch_layer,
ListSnapsRequest{object_no,
std::move(extents),
std::move(snap_ids),
list_snaps_flags,
snapshot_delta},
{}, 0, parent_trace, on_finish);
}
void send();
void fail(int r);
private:
template <typename> friend class ObjectDispatcher;
ObjectDispatchSpec(ObjectDispatcherInterface* object_dispatcher,
ObjectDispatchLayer object_dispatch_layer,
Request&& request, IOContext io_context, int op_flags,
const ZTracer::Trace& parent_trace, Context* on_finish)
: dispatcher_ctx(this, on_finish), object_dispatcher(object_dispatcher),
dispatch_layer(object_dispatch_layer), request(std::move(request)),
io_context(io_context), op_flags(op_flags), parent_trace(parent_trace) {
}
};
} // namespace io
} // namespace librbd
#endif // CEPH_LIBRBD_IO_OBJECT_DISPATCH_SPEC_H
|
