Makefile: Suppress `-Wimplicit-fallthrough` when compiling `lex.yy`
[fio.git] / engines / null.c
... / ...
CommitLineData
1/*
2 * null engine
3 *
4 * IO engine that doesn't do any real IO transfers, it just pretends to.
5 * The main purpose is to test fio itself.
6 *
7 * It also can act as external C++ engine - compiled with:
8 *
9 * g++ -O2 -g -shared -rdynamic -fPIC -o cpp_null null.c \
10 * -include ../config-host.h -DFIO_EXTERNAL_ENGINE
11 *
12 * to test it execute:
13 *
14 * LD_LIBRARY_PATH=./engines ./fio examples/cpp_null.fio
15 *
16 */
17#include <stdlib.h>
18#include <assert.h>
19
20#include "../fio.h"
21
22struct null_data {
23 struct io_u **io_us;
24 int queued;
25 int events;
26};
27
28static struct io_u *null_event(struct null_data *nd, int event)
29{
30 return nd->io_us[event];
31}
32
33static int null_getevents(struct null_data *nd, unsigned int min_events,
34 unsigned int fio_unused max,
35 const struct timespec fio_unused *t)
36{
37 int ret = 0;
38
39 if (min_events) {
40 ret = nd->events;
41 nd->events = 0;
42 }
43
44 return ret;
45}
46
47static int null_commit(struct thread_data *td, struct null_data *nd)
48{
49 if (!nd->events) {
50#ifndef FIO_EXTERNAL_ENGINE
51 io_u_mark_submit(td, nd->queued);
52#endif
53 nd->events = nd->queued;
54 nd->queued = 0;
55 }
56
57 return 0;
58}
59
60static enum fio_q_status null_queue(struct thread_data *td,
61 struct null_data *nd, struct io_u *io_u)
62{
63 fio_ro_check(td, io_u);
64
65 if (td->io_ops->flags & FIO_SYNCIO)
66 return FIO_Q_COMPLETED;
67 if (nd->events)
68 return FIO_Q_BUSY;
69
70 nd->io_us[nd->queued++] = io_u;
71 return FIO_Q_QUEUED;
72}
73
74static int null_open(struct null_data fio_unused *nd,
75 struct fio_file fio_unused *f)
76{
77 return 0;
78}
79
80static void null_cleanup(struct null_data *nd)
81{
82 if (nd) {
83 free(nd->io_us);
84 free(nd);
85 }
86}
87
88static struct null_data *null_init(struct thread_data *td)
89{
90 struct null_data *nd = (struct null_data *) malloc(sizeof(*nd));
91
92 memset(nd, 0, sizeof(*nd));
93
94 if (td->o.iodepth != 1) {
95 nd->io_us = (struct io_u **) malloc(td->o.iodepth * sizeof(struct io_u *));
96 memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
97 } else
98 td->io_ops->flags |= FIO_SYNCIO;
99
100 return nd;
101}
102
103#ifndef __cplusplus
104
105static struct io_u *fio_null_event(struct thread_data *td, int event)
106{
107 return null_event(td->io_ops_data, event);
108}
109
110static int fio_null_getevents(struct thread_data *td, unsigned int min_events,
111 unsigned int max, const struct timespec *t)
112{
113 struct null_data *nd = td->io_ops_data;
114 return null_getevents(nd, min_events, max, t);
115}
116
117static int fio_null_commit(struct thread_data *td)
118{
119 return null_commit(td, td->io_ops_data);
120}
121
122static enum fio_q_status fio_null_queue(struct thread_data *td,
123 struct io_u *io_u)
124{
125 return null_queue(td, td->io_ops_data, io_u);
126}
127
128static int fio_null_open(struct thread_data *td, struct fio_file *f)
129{
130 return null_open(td->io_ops_data, f);
131}
132
133static void fio_null_cleanup(struct thread_data *td)
134{
135 null_cleanup(td->io_ops_data);
136}
137
138static int fio_null_init(struct thread_data *td)
139{
140 td->io_ops_data = null_init(td);
141 assert(td->io_ops_data);
142 return 0;
143}
144
145static struct ioengine_ops ioengine = {
146 .name = "null",
147 .version = FIO_IOOPS_VERSION,
148 .queue = fio_null_queue,
149 .commit = fio_null_commit,
150 .getevents = fio_null_getevents,
151 .event = fio_null_event,
152 .init = fio_null_init,
153 .cleanup = fio_null_cleanup,
154 .open_file = fio_null_open,
155 .flags = FIO_DISKLESSIO | FIO_FAKEIO,
156};
157
158static void fio_init fio_null_register(void)
159{
160 register_ioengine(&ioengine);
161}
162
163static void fio_exit fio_null_unregister(void)
164{
165 unregister_ioengine(&ioengine);
166}
167
168#else
169
170#ifdef FIO_EXTERNAL_ENGINE
171
172struct NullData {
173 NullData(struct thread_data *td)
174 {
175 impl_ = null_init(td);
176 assert(impl_);
177 }
178
179 ~NullData()
180 {
181 null_cleanup(impl_);
182 }
183
184 static NullData *get(struct thread_data *td)
185 {
186 return reinterpret_cast<NullData *>(td->io_ops_data);
187 }
188
189 io_u *fio_null_event(struct thread_data *, int event)
190 {
191 return null_event(impl_, event);
192 }
193
194 int fio_null_getevents(struct thread_data *, unsigned int min_events,
195 unsigned int max, const struct timespec *t)
196 {
197 return null_getevents(impl_, min_events, max, t);
198 }
199
200 int fio_null_commit(struct thread_data *td)
201 {
202 return null_commit(td, impl_);
203 }
204
205 fio_q_status fio_null_queue(struct thread_data *td, struct io_u *io_u)
206 {
207 return null_queue(td, impl_, io_u);
208 }
209
210 int fio_null_open(struct thread_data *, struct fio_file *f)
211 {
212 return null_open(impl_, f);
213 }
214
215private:
216 struct null_data *impl_;
217};
218
219extern "C" {
220
221static struct io_u *fio_null_event(struct thread_data *td, int event)
222{
223 return NullData::get(td)->fio_null_event(td, event);
224}
225
226static int fio_null_getevents(struct thread_data *td, unsigned int min_events,
227 unsigned int max, const struct timespec *t)
228{
229 return NullData::get(td)->fio_null_getevents(td, min_events, max, t);
230}
231
232static int fio_null_commit(struct thread_data *td)
233{
234 return NullData::get(td)->fio_null_commit(td);
235}
236
237static fio_q_status fio_null_queue(struct thread_data *td, struct io_u *io_u)
238{
239 return NullData::get(td)->fio_null_queue(td, io_u);
240}
241
242static int fio_null_open(struct thread_data *td, struct fio_file *f)
243{
244 return NullData::get(td)->fio_null_open(td, f);
245}
246
247static int fio_null_init(struct thread_data *td)
248{
249 td->io_ops_data = new NullData(td);
250 return 0;
251}
252
253static void fio_null_cleanup(struct thread_data *td)
254{
255 delete NullData::get(td);
256}
257
258static struct ioengine_ops ioengine;
259void get_ioengine(struct ioengine_ops **ioengine_ptr)
260{
261 *ioengine_ptr = &ioengine;
262
263 ioengine.name = "cpp_null";
264 ioengine.version = FIO_IOOPS_VERSION;
265 ioengine.queue = fio_null_queue;
266 ioengine.commit = fio_null_commit;
267 ioengine.getevents = fio_null_getevents;
268 ioengine.event = fio_null_event;
269 ioengine.init = fio_null_init;
270 ioengine.cleanup = fio_null_cleanup;
271 ioengine.open_file = fio_null_open;
272 ioengine.flags = FIO_DISKLESSIO | FIO_FAKEIO;
273}
274}
275#endif /* FIO_EXTERNAL_ENGINE */
276
277#endif /* __cplusplus */