[PATCH] Implement file syncing as data direction
[fio.git] / engines / fio-engine-sync.c
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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
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17static int fio_syncio_getevents(struct thread_data *td, int fio_unused min,
18 int max, struct timespec fio_unused *t)
19{
20 assert(max <= 1);
21
22 /*
23 * we can only have one finished io_u for sync io, since the depth
24 * is always 1
25 */
26 if (list_empty(&td->io_u_busylist))
27 return 0;
28
29 return 1;
30}
31
32static struct io_u *fio_syncio_event(struct thread_data *td, int event)
33{
34 struct syncio_data *sd = td->io_ops->data;
35
36 assert(event == 0);
37
38 return sd->last_io_u;
39}
40
41static int fio_syncio_prep(struct thread_data *td, struct io_u *io_u)
42{
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43 struct fio_file *f = io_u->file;
44
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45 if (io_u->ddir == DDIR_SYNC)
46 return 0;
47
53cdc686 48 if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) {
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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;
53cdc686 59 struct fio_file *f = io_u->file;
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60 int ret;
61
62 if (io_u->ddir == DDIR_READ)
53cdc686 63 ret = read(f->fd, io_u->buf, io_u->buflen);
87dc1ab1 64 else if (io_u->ddir == DDIR_WRITE)
53cdc686 65 ret = write(f->fd, io_u->buf, io_u->buflen);
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66 else
67 ret = fsync(f->fd);
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68
69 if ((unsigned int) ret != io_u->buflen) {
70 if (ret > 0) {
71 io_u->resid = io_u->buflen - ret;
72 io_u->error = EIO;
73 } else
74 io_u->error = errno;
75 }
76
77 if (!io_u->error)
78 sd->last_io_u = io_u;
79
80 return io_u->error;
81}
82
83static void fio_syncio_cleanup(struct thread_data *td)
84{
85 if (td->io_ops->data) {
86 free(td->io_ops->data);
87 td->io_ops->data = NULL;
88 }
89}
90
91static int fio_syncio_init(struct thread_data *td)
92{
93 struct syncio_data *sd = malloc(sizeof(*sd));
94
95 sd->last_io_u = NULL;
96 td->io_ops->data = sd;
97 return 0;
98}
99
100struct ioengine_ops ioengine = {
101 .name = "sync",
102 .version = FIO_IOOPS_VERSION,
103 .init = fio_syncio_init,
104 .prep = fio_syncio_prep,
105 .queue = fio_syncio_queue,
106 .getevents = fio_syncio_getevents,
107 .event = fio_syncio_event,
108 .cleanup = fio_syncio_cleanup,
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109 .flags = FIO_SYNCIO,
110};