[PATCH] engines/Makefile had extra LIBS line
[fio.git] / engines / fio-engine-sync.c
CommitLineData
2866c82d
JA
1/*
2 * regular read/write sync 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 syncio_data {
14 struct io_u *last_io_u;
15};
16
17static int fio_syncio_sync(struct thread_data *td)
18{
19 return fsync(td->fd);
20}
21
22static int fio_syncio_getevents(struct thread_data *td, int fio_unused min,
23 int max, struct timespec fio_unused *t)
24{
25 assert(max <= 1);
26
27 /*
28 * we can only have one finished io_u for sync io, since the depth
29 * is always 1
30 */
31 if (list_empty(&td->io_u_busylist))
32 return 0;
33
34 return 1;
35}
36
37static struct io_u *fio_syncio_event(struct thread_data *td, int event)
38{
39 struct syncio_data *sd = td->io_ops->data;
40
41 assert(event == 0);
42
43 return sd->last_io_u;
44}
45
46static int fio_syncio_prep(struct thread_data *td, struct io_u *io_u)
47{
48 if (lseek(td->fd, io_u->offset, SEEK_SET) == -1) {
49 td_verror(td, errno);
50 return 1;
51 }
52
53 return 0;
54}
55
56static int fio_syncio_queue(struct thread_data *td, struct io_u *io_u)
57{
58 struct syncio_data *sd = td->io_ops->data;
59 int ret;
60
61 if (io_u->ddir == DDIR_READ)
62 ret = read(td->fd, io_u->buf, io_u->buflen);
63 else
64 ret = write(td->fd, io_u->buf, io_u->buflen);
65
66 if ((unsigned int) ret != io_u->buflen) {
67 if (ret > 0) {
68 io_u->resid = io_u->buflen - ret;
69 io_u->error = EIO;
70 } else
71 io_u->error = errno;
72 }
73
74 if (!io_u->error)
75 sd->last_io_u = io_u;
76
77 return io_u->error;
78}
79
80static void fio_syncio_cleanup(struct thread_data *td)
81{
82 if (td->io_ops->data) {
83 free(td->io_ops->data);
84 td->io_ops->data = NULL;
85 }
86}
87
88static int fio_syncio_init(struct thread_data *td)
89{
90 struct syncio_data *sd = malloc(sizeof(*sd));
91
92 sd->last_io_u = NULL;
93 td->io_ops->data = sd;
94 return 0;
95}
96
97struct ioengine_ops ioengine = {
98 .name = "sync",
99 .version = FIO_IOOPS_VERSION,
100 .init = fio_syncio_init,
101 .prep = fio_syncio_prep,
102 .queue = fio_syncio_queue,
103 .getevents = fio_syncio_getevents,
104 .event = fio_syncio_event,
105 .cleanup = fio_syncio_cleanup,
106 .sync = fio_syncio_sync,
107 .flags = FIO_SYNCIO,
108};