summaryrefslogtreecommitdiff
path: root/engines/posixaio.c
blob: 3ffdcb6bccc8d062b1be302b27c3cb004bd57d11 (plain)
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
/*
 * posixaio engine
 *
 * IO engine that uses the posix defined aio interface.
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>

#include "../fio.h"

#ifdef FIO_HAVE_POSIXAIO

struct posixaio_data {
	struct io_u **aio_events;
	unsigned int queued;
};

static int fill_timespec(struct timespec *ts)
{
#ifdef _POSIX_TIMERS
	if (!clock_gettime(CLOCK_MONOTONIC, ts))
		return 0;

	perror("clock_gettime");
#endif
	return 1;
}

static unsigned long long ts_utime_since_now(struct timespec *t)
{
	long long sec, nsec;
	struct timespec now;

	if (fill_timespec(&now))
		return 0;
	
	sec = now.tv_sec - t->tv_sec;
	nsec = now.tv_nsec - t->tv_nsec;
	if (sec > 0 && nsec < 0) {
		sec--;
		nsec += 1000000000;
	}

	sec *= 1000000;
	nsec /= 1000;
	return sec + nsec;
}

static int fio_posixaio_cancel(struct thread_data fio_unused *td,
			       struct io_u *io_u)
{
	struct fio_file *f = io_u->file;
	int r = aio_cancel(f->fd, &io_u->aiocb);

	if (r == 1 || r == AIO_CANCELED)
		return 0;

	return 1;
}

static int fio_posixaio_prep(struct thread_data fio_unused *td,
			     struct io_u *io_u)
{
	struct aiocb *aiocb = &io_u->aiocb;
	struct fio_file *f = io_u->file;

	aiocb->aio_fildes = f->fd;
	aiocb->aio_buf = io_u->xfer_buf;
	aiocb->aio_nbytes = io_u->xfer_buflen;
	aiocb->aio_offset = io_u->offset;

	io_u->seen = 0;
	return 0;
}

#define SUSPEND_ENTRIES	8

static int fio_posixaio_getevents(struct thread_data *td, unsigned int min,
				  unsigned int max, struct timespec *t)
{
	struct posixaio_data *pd = td->io_ops->data;
	struct aiocb *suspend_list[SUSPEND_ENTRIES];
	struct flist_head *entry;
	struct timespec start;
	int have_timeout = 0;
	int suspend_entries = 0;
	unsigned int r;

	if (t && !fill_timespec(&start))
		have_timeout = 1;

	r = 0;
	memset(suspend_list, 0, sizeof(*suspend_list));
restart:
	flist_for_each(entry, &td->io_u_busylist) {
		struct io_u *io_u = flist_entry(entry, struct io_u, list);
		int err;

		if (io_u->seen)
			continue;

		err = aio_error(&io_u->aiocb);
		if (err == EINPROGRESS) {
			if (suspend_entries < SUSPEND_ENTRIES) {
				suspend_list[suspend_entries] = &io_u->aiocb;
				suspend_entries++;
			}
			continue;
		}

		io_u->seen = 1;
		pd->queued--;
		pd->aio_events[r++] = io_u;

		if (err == ECANCELED)
			io_u->resid = io_u->xfer_buflen;
		else if (!err) {
			ssize_t retval = aio_return(&io_u->aiocb);

			io_u->resid = io_u->xfer_buflen - retval;
		} else
			io_u->error = err;

		if (r >= max)
			break;
	}

	if (r >= min)
		return r;

	if (have_timeout) {
		unsigned long long usec;

		usec = (t->tv_sec * 1000000) + (t->tv_nsec / 1000);
		if (ts_utime_since_now(&start) > usec)
			return r;
	}

	/*
	 * must have some in-flight, wait for at least one
	 */
	aio_suspend((const struct aiocb * const *)suspend_list,
							suspend_entries, t);
	goto restart;
}

static struct io_u *fio_posixaio_event(struct thread_data *td, int event)
{
	struct posixaio_data *pd = td->io_ops->data;

	return pd->aio_events[event];
}

static int fio_posixaio_queue(struct thread_data fio_unused *td,
			      struct io_u *io_u)
{
	struct posixaio_data *pd = td->io_ops->data;
	struct aiocb *aiocb = &io_u->aiocb;
	int ret;

	fio_ro_check(td, io_u);

	if (io_u->ddir == DDIR_READ)
		ret = aio_read(aiocb);
	else if (io_u->ddir == DDIR_WRITE)
		ret = aio_write(aiocb);
	else {
#ifdef FIO_HAVE_POSIXAIO_FSYNC
		ret = aio_fsync(O_SYNC, aiocb);
#else
		if (pd->queued)
			return FIO_Q_BUSY;

		if (fsync(io_u->file->fd) < 0)
			io_u->error = errno;

		return FIO_Q_COMPLETED;
#endif
	}
		
	if (ret) {
		io_u->error = errno;
		td_verror(td, io_u->error, "xfer");
		return FIO_Q_COMPLETED;
	}

	pd->queued++;
	return FIO_Q_QUEUED;
}

static void fio_posixaio_cleanup(struct thread_data *td)
{
	struct posixaio_data *pd = td->io_ops->data;

	if (pd) {
		free(pd->aio_events);
		free(pd);
	}
}

static int fio_posixaio_init(struct thread_data *td)
{
	struct posixaio_data *pd = malloc(sizeof(*pd));

	memset(pd, 0, sizeof(*pd));
	pd->aio_events = malloc(td->o.iodepth * sizeof(struct io_u *));
	memset(pd->aio_events, 0, td->o.iodepth * sizeof(struct io_u *));

	td->io_ops->data = pd;
	return 0;
}

static struct ioengine_ops ioengine = {
	.name		= "posixaio",
	.version	= FIO_IOOPS_VERSION,
	.init		= fio_posixaio_init,
	.prep		= fio_posixaio_prep,
	.queue		= fio_posixaio_queue,
	.cancel		= fio_posixaio_cancel,
	.getevents	= fio_posixaio_getevents,
	.event		= fio_posixaio_event,
	.cleanup	= fio_posixaio_cleanup,
	.open_file	= generic_open_file,
	.close_file	= generic_close_file,
	.get_file_size	= generic_get_file_size,
};

#else /* FIO_HAVE_POSIXAIO */

/*
 * When we have a proper configure system in place, we simply wont build
 * and install this io engine. For now install a crippled version that
 * just complains and fails to load.
 */
static int fio_posixaio_init(struct thread_data fio_unused *td)
{
	fprintf(stderr, "fio: posixaio not available\n");
	return 1;
}

static struct ioengine_ops ioengine = {
	.name		= "posixaio",
	.version	= FIO_IOOPS_VERSION,
	.init		= fio_posixaio_init,
};

#endif

static void fio_init fio_posixaio_register(void)
{
	register_ioengine(&ioengine);
}

static void fio_exit fio_posixaio_unregister(void)
{
	unregister_ioengine(&ioengine);
}