[PATCH] Make io engines -W clean
[fio.git] / engines / fio-engine-posixaio.c
CommitLineData
2866c82d
JA
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>
10#include "fio.h"
11#include "os.h"
12
13struct posixaio_data {
14 struct io_u **aio_events;
15};
16
17static int fill_timespec(struct timespec *ts)
18{
19#ifdef _POSIX_TIMERS
20 if (!clock_gettime(CLOCK_MONOTONIC, ts))
21 return 0;
22
23 perror("clock_gettime");
24#endif
25 return 1;
26}
27
28static unsigned long long ts_utime_since_now(struct timespec *t)
29{
30 long long sec, nsec;
31 struct timespec now;
32
33 if (fill_timespec(&now))
34 return 0;
35
36 sec = now.tv_sec - t->tv_sec;
37 nsec = now.tv_nsec - t->tv_nsec;
38 if (sec > 0 && nsec < 0) {
39 sec--;
40 nsec += 1000000000;
41 }
42
43 sec *= 1000000;
44 nsec /= 1000;
45 return sec + nsec;
46}
47
7a16dd02
JA
48static int fio_posixaio_sync(struct thread_data fio_unused *td,
49 struct fio_file *f)
2866c82d 50{
53cdc686 51 return fsync(f->fd);
2866c82d
JA
52}
53
7a16dd02
JA
54static int fio_posixaio_cancel(struct thread_data fio_unused *td,
55 struct io_u *io_u)
2866c82d 56{
53cdc686
JA
57 struct fio_file *f = io_u->file;
58 int r = aio_cancel(f->fd, &io_u->aiocb);
2866c82d
JA
59
60 if (r == 1 || r == AIO_CANCELED)
61 return 0;
62
63 return 1;
64}
65
7a16dd02
JA
66static int fio_posixaio_prep(struct thread_data fio_unused *td,
67 struct io_u *io_u)
2866c82d
JA
68{
69 struct aiocb *aiocb = &io_u->aiocb;
53cdc686 70 struct fio_file *f = io_u->file;
2866c82d 71
53cdc686 72 aiocb->aio_fildes = f->fd;
2866c82d
JA
73 aiocb->aio_buf = io_u->buf;
74 aiocb->aio_nbytes = io_u->buflen;
75 aiocb->aio_offset = io_u->offset;
76
77 io_u->seen = 0;
78 return 0;
79}
80
81static int fio_posixaio_getevents(struct thread_data *td, int min, int max,
82 struct timespec *t)
83{
84 struct posixaio_data *pd = td->io_ops->data;
85 struct list_head *entry;
86 struct timespec start;
87 int r, have_timeout = 0;
88
89 if (t && !fill_timespec(&start))
90 have_timeout = 1;
91
92 r = 0;
93restart:
94 list_for_each(entry, &td->io_u_busylist) {
95 struct io_u *io_u = list_entry(entry, struct io_u, list);
96 int err;
97
98 if (io_u->seen)
99 continue;
100
101 err = aio_error(&io_u->aiocb);
102 switch (err) {
103 default:
104 io_u->error = err;
105 case ECANCELED:
106 case 0:
107 pd->aio_events[r++] = io_u;
108 io_u->seen = 1;
109 break;
110 case EINPROGRESS:
111 break;
112 }
113
114 if (r >= max)
115 break;
116 }
117
118 if (r >= min)
119 return r;
120
121 if (have_timeout) {
122 unsigned long long usec;
123
124 usec = (t->tv_sec * 1000000) + (t->tv_nsec / 1000);
125 if (ts_utime_since_now(&start) > usec)
126 return r;
127 }
128
129 /*
130 * hrmpf, we need to wait for more. we should use aio_suspend, for
131 * now just sleep a little and recheck status of busy-and-not-seen
132 */
133 usleep(1000);
134 goto restart;
135}
136
137static struct io_u *fio_posixaio_event(struct thread_data *td, int event)
138{
139 struct posixaio_data *pd = td->io_ops->data;
140
141 return pd->aio_events[event];
142}
143
144static int fio_posixaio_queue(struct thread_data fio_unused *td,
145 struct io_u *io_u)
146{
147 struct aiocb *aiocb = &io_u->aiocb;
148 int ret;
149
150 if (io_u->ddir == DDIR_READ)
151 ret = aio_read(aiocb);
152 else
153 ret = aio_write(aiocb);
154
155 if (ret)
156 io_u->error = errno;
157
158 return io_u->error;
159}
160
161static void fio_posixaio_cleanup(struct thread_data *td)
162{
163 struct posixaio_data *pd = td->io_ops->data;
164
165 if (pd) {
166 free(pd->aio_events);
167 free(pd);
168 td->io_ops->data = NULL;
169 }
170}
171
172static int fio_posixaio_init(struct thread_data *td)
173{
174 struct posixaio_data *pd = malloc(sizeof(*pd));
175
176 pd->aio_events = malloc(td->iodepth * sizeof(struct io_u *));
177
178 td->io_ops->data = pd;
179 return 0;
180}
181
182struct ioengine_ops ioengine = {
183 .name = "posixaio",
184 .version = FIO_IOOPS_VERSION,
185 .init = fio_posixaio_init,
186 .prep = fio_posixaio_prep,
187 .queue = fio_posixaio_queue,
188 .cancel = fio_posixaio_cancel,
189 .getevents = fio_posixaio_getevents,
190 .event = fio_posixaio_event,
191 .cleanup = fio_posixaio_cleanup,
192 .sync = fio_posixaio_sync,
193};