Commit | Line | Data |
---|---|---|
a94ea28b JA |
1 | /* |
2 | * null engine - doesn't do any transfers. Used to test fio. | |
3 | * | |
4 | */ | |
5 | #include <stdio.h> | |
6 | #include <stdlib.h> | |
7 | #include <unistd.h> | |
8 | #include <errno.h> | |
9 | #include <assert.h> | |
10 | ||
11 | #include "../fio.h" | |
12 | #include "../os.h" | |
13 | ||
65afa5f2 JA |
14 | struct null_data { |
15 | struct io_u **io_us; | |
16 | int queued; | |
17 | int events; | |
18 | }; | |
19 | ||
20 | static struct io_u *fio_null_event(struct thread_data *td, int event) | |
21 | { | |
22 | struct null_data *nd = td->io_ops->data; | |
23 | ||
24 | return nd->io_us[event]; | |
25 | } | |
26 | ||
7401c088 | 27 | static int fio_null_getevents(struct thread_data *td, int min_events, |
65afa5f2 JA |
28 | int fio_unused max, struct timespec fio_unused *t) |
29 | { | |
30 | struct null_data *nd = td->io_ops->data; | |
7401c088 JA |
31 | int ret = 0; |
32 | ||
33 | if (min_events) { | |
34 | ret = nd->events; | |
35 | nd->events = 0; | |
36 | } | |
65afa5f2 | 37 | |
65afa5f2 JA |
38 | return ret; |
39 | } | |
40 | ||
41 | static int fio_null_commit(struct thread_data *td) | |
42 | { | |
43 | struct null_data *nd = td->io_ops->data; | |
44 | ||
7401c088 | 45 | nd->events += nd->queued; |
65afa5f2 JA |
46 | nd->queued = 0; |
47 | return 0; | |
48 | } | |
49 | ||
36167d82 | 50 | static int fio_null_queue(struct thread_data fio_unused *td, struct io_u *io_u) |
a94ea28b | 51 | { |
65afa5f2 JA |
52 | struct null_data *nd = td->io_ops->data; |
53 | ||
54 | if (td->io_ops->flags & FIO_SYNCIO) | |
55 | return FIO_Q_COMPLETED; | |
56 | ||
57 | nd->io_us[nd->queued++] = io_u; | |
58 | return FIO_Q_QUEUED; | |
a94ea28b JA |
59 | } |
60 | ||
2fd233b7 JA |
61 | static int fio_null_setup(struct thread_data *td) |
62 | { | |
63 | struct fio_file *f; | |
64 | int i; | |
65 | ||
66 | if (!td->total_file_size) { | |
67 | log_err("fio: need size= set\n"); | |
68 | return 1; | |
69 | } | |
70 | ||
71 | td->io_size = td->total_file_size; | |
72 | td->total_io_size = td->io_size; | |
73 | ||
74 | for_each_file(td, f, i) { | |
2fd233b7 JA |
75 | f->real_file_size = td->total_io_size / td->nr_files; |
76 | f->file_size = f->real_file_size; | |
77 | } | |
78 | ||
2fd233b7 JA |
79 | return 0; |
80 | } | |
81 | ||
b5af8293 JA |
82 | static int fio_null_open(struct thread_data fio_unused *td, |
83 | struct fio_file fio_unused *f) | |
84 | { | |
640e9421 | 85 | f->fd = 0; |
b5af8293 JA |
86 | return 0; |
87 | } | |
88 | ||
65afa5f2 JA |
89 | static void fio_null_cleanup(struct thread_data *td) |
90 | { | |
91 | struct null_data *nd = td->io_ops->data; | |
92 | ||
93 | if (nd) { | |
94 | if (nd->io_us) | |
95 | free(nd->io_us); | |
96 | free(nd); | |
97 | td->io_ops->data = NULL; | |
98 | } | |
99 | } | |
100 | ||
101 | static int fio_null_init(struct thread_data *td) | |
102 | { | |
103 | struct null_data *nd = malloc(sizeof(*nd)); | |
104 | ||
105 | memset(nd, 0, sizeof(*nd)); | |
106 | ||
107 | if (td->iodepth != 1) { | |
108 | nd->io_us = malloc(td->iodepth * sizeof(struct io_u *)); | |
109 | memset(nd->io_us, 0, td->iodepth * sizeof(struct io_u *)); | |
110 | } else | |
111 | td->io_ops->flags |= FIO_SYNCIO; | |
112 | ||
113 | td->io_ops->data = nd; | |
114 | return 0; | |
115 | } | |
116 | ||
a94ea28b JA |
117 | static struct ioengine_ops ioengine = { |
118 | .name = "null", | |
119 | .version = FIO_IOOPS_VERSION, | |
2fd233b7 | 120 | .setup = fio_null_setup, |
a94ea28b | 121 | .queue = fio_null_queue, |
65afa5f2 JA |
122 | .commit = fio_null_commit, |
123 | .getevents = fio_null_getevents, | |
124 | .event = fio_null_event, | |
125 | .init = fio_null_init, | |
126 | .cleanup = fio_null_cleanup, | |
b5af8293 | 127 | .open_file = fio_null_open, |
65afa5f2 | 128 | .flags = FIO_DISKLESSIO, |
a94ea28b JA |
129 | }; |
130 | ||
131 | static void fio_init fio_null_register(void) | |
132 | { | |
133 | register_ioengine(&ioengine); | |
134 | } | |
135 | ||
136 | static void fio_exit fio_null_unregister(void) | |
137 | { | |
138 | unregister_ioengine(&ioengine); | |
139 | } |