[PATCH] Document ->queue() in the skeleton engine
[fio.git] / engines / posixaio.c
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1/*
2 * posix aio io engine
3 *
4 */
5#include <stdio.h>
6#include <stdlib.h>
7#include <unistd.h>
8#include <errno.h>
9#include <assert.h>
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10
11#include "../fio.h"
12#include "../os.h"
2866c82d 13
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14#ifdef FIO_HAVE_POSIXAIO
15
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16struct posixaio_data {
17 struct io_u **aio_events;
18};
19
20static int fill_timespec(struct timespec *ts)
21{
22#ifdef _POSIX_TIMERS
23 if (!clock_gettime(CLOCK_MONOTONIC, ts))
24 return 0;
25
26 perror("clock_gettime");
27#endif
28 return 1;
29}
30
31static unsigned long long ts_utime_since_now(struct timespec *t)
32{
33 long long sec, nsec;
34 struct timespec now;
35
36 if (fill_timespec(&now))
37 return 0;
38
39 sec = now.tv_sec - t->tv_sec;
40 nsec = now.tv_nsec - t->tv_nsec;
41 if (sec > 0 && nsec < 0) {
42 sec--;
43 nsec += 1000000000;
44 }
45
46 sec *= 1000000;
47 nsec /= 1000;
48 return sec + nsec;
49}
50
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51static int fio_posixaio_cancel(struct thread_data fio_unused *td,
52 struct io_u *io_u)
2866c82d 53{
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54 struct fio_file *f = io_u->file;
55 int r = aio_cancel(f->fd, &io_u->aiocb);
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56
57 if (r == 1 || r == AIO_CANCELED)
58 return 0;
59
60 return 1;
61}
62
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63static int fio_posixaio_prep(struct thread_data fio_unused *td,
64 struct io_u *io_u)
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65{
66 struct aiocb *aiocb = &io_u->aiocb;
53cdc686 67 struct fio_file *f = io_u->file;
2866c82d 68
53cdc686 69 aiocb->aio_fildes = f->fd;
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70 aiocb->aio_buf = io_u->xfer_buf;
71 aiocb->aio_nbytes = io_u->xfer_buflen;
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72 aiocb->aio_offset = io_u->offset;
73
74 io_u->seen = 0;
75 return 0;
76}
77
78static int fio_posixaio_getevents(struct thread_data *td, int min, int max,
79 struct timespec *t)
80{
81 struct posixaio_data *pd = td->io_ops->data;
82 struct list_head *entry;
83 struct timespec start;
84 int r, have_timeout = 0;
85
86 if (t && !fill_timespec(&start))
87 have_timeout = 1;
88
89 r = 0;
90restart:
91 list_for_each(entry, &td->io_u_busylist) {
92 struct io_u *io_u = list_entry(entry, struct io_u, list);
93 int err;
94
95 if (io_u->seen)
96 continue;
97
98 err = aio_error(&io_u->aiocb);
99 switch (err) {
100 default:
101 io_u->error = err;
102 case ECANCELED:
103 case 0:
104 pd->aio_events[r++] = io_u;
105 io_u->seen = 1;
106 break;
107 case EINPROGRESS:
108 break;
109 }
110
111 if (r >= max)
112 break;
113 }
114
115 if (r >= min)
116 return r;
117
118 if (have_timeout) {
119 unsigned long long usec;
120
121 usec = (t->tv_sec * 1000000) + (t->tv_nsec / 1000);
122 if (ts_utime_since_now(&start) > usec)
123 return r;
124 }
125
126 /*
127 * hrmpf, we need to wait for more. we should use aio_suspend, for
128 * now just sleep a little and recheck status of busy-and-not-seen
129 */
130 usleep(1000);
131 goto restart;
132}
133
134static struct io_u *fio_posixaio_event(struct thread_data *td, int event)
135{
136 struct posixaio_data *pd = td->io_ops->data;
137
138 return pd->aio_events[event];
139}
140
141static int fio_posixaio_queue(struct thread_data fio_unused *td,
142 struct io_u *io_u)
143{
144 struct aiocb *aiocb = &io_u->aiocb;
145 int ret;
146
147 if (io_u->ddir == DDIR_READ)
148 ret = aio_read(aiocb);
87dc1ab1 149 else if (io_u->ddir == DDIR_WRITE)
2866c82d 150 ret = aio_write(aiocb);
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151 else
152 ret = aio_fsync(O_SYNC, aiocb);
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153
154 if (ret)
155 io_u->error = errno;
156
157 return io_u->error;
158}
159
160static void fio_posixaio_cleanup(struct thread_data *td)
161{
162 struct posixaio_data *pd = td->io_ops->data;
163
164 if (pd) {
165 free(pd->aio_events);
166 free(pd);
167 td->io_ops->data = NULL;
168 }
169}
170
171static int fio_posixaio_init(struct thread_data *td)
172{
173 struct posixaio_data *pd = malloc(sizeof(*pd));
174
cb781c75 175 memset(pd, 0, sizeof(*pd));
2866c82d 176 pd->aio_events = malloc(td->iodepth * sizeof(struct io_u *));
cb781c75 177 memset(pd->aio_events, 0, td->iodepth * sizeof(struct io_u *));
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178
179 td->io_ops->data = pd;
180 return 0;
181}
182
5f350952 183static struct ioengine_ops ioengine = {
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184 .name = "posixaio",
185 .version = FIO_IOOPS_VERSION,
186 .init = fio_posixaio_init,
187 .prep = fio_posixaio_prep,
188 .queue = fio_posixaio_queue,
189 .cancel = fio_posixaio_cancel,
190 .getevents = fio_posixaio_getevents,
191 .event = fio_posixaio_event,
192 .cleanup = fio_posixaio_cleanup,
2866c82d 193};
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194
195#else /* FIO_HAVE_POSIXAIO */
196
197/*
198 * When we have a proper configure system in place, we simply wont build
199 * and install this io engine. For now install a crippled version that
200 * just complains and fails to load.
201 */
202static int fio_posixaio_init(struct thread_data fio_unused *td)
203{
204 fprintf(stderr, "fio: posixaio not available\n");
205 return 1;
206}
207
5f350952 208static struct ioengine_ops ioengine = {
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209 .name = "posixaio",
210 .version = FIO_IOOPS_VERSION,
211 .init = fio_posixaio_init,
212};
213
214#endif
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215
216static void fio_init fio_posixaio_register(void)
217{
218 register_ioengine(&ioengine);
219}
220
221static void fio_exit fio_posixaio_unregister(void)
222{
223 unregister_ioengine(&ioengine);
224}