Commit | Line | Data |
---|---|---|
a94ea28b | 1 | /* |
da751ca9 JA |
2 | * null engine |
3 | * | |
4 | * IO engine that doesn't do any real IO transfers, it just pretends to. | |
5 | * The main purpose is to test fio itself. | |
a94ea28b JA |
6 | * |
7 | */ | |
8 | #include <stdio.h> | |
9 | #include <stdlib.h> | |
10 | #include <unistd.h> | |
11 | #include <errno.h> | |
12 | #include <assert.h> | |
13 | ||
14 | #include "../fio.h" | |
15 | #include "../os.h" | |
16 | ||
65afa5f2 JA |
17 | struct null_data { |
18 | struct io_u **io_us; | |
19 | int queued; | |
20 | int events; | |
21 | }; | |
22 | ||
23 | static struct io_u *fio_null_event(struct thread_data *td, int event) | |
24 | { | |
25 | struct null_data *nd = td->io_ops->data; | |
26 | ||
27 | return nd->io_us[event]; | |
28 | } | |
29 | ||
7401c088 | 30 | static int fio_null_getevents(struct thread_data *td, int min_events, |
65afa5f2 JA |
31 | int fio_unused max, struct timespec fio_unused *t) |
32 | { | |
33 | struct null_data *nd = td->io_ops->data; | |
7401c088 JA |
34 | int ret = 0; |
35 | ||
36 | if (min_events) { | |
37 | ret = nd->events; | |
38 | nd->events = 0; | |
39 | } | |
65afa5f2 | 40 | |
65afa5f2 JA |
41 | return ret; |
42 | } | |
43 | ||
44 | static int fio_null_commit(struct thread_data *td) | |
45 | { | |
46 | struct null_data *nd = td->io_ops->data; | |
47 | ||
ed8bd849 JA |
48 | if (!nd->events) { |
49 | nd->events = nd->queued; | |
50 | nd->queued = 0; | |
51 | } | |
52 | ||
65afa5f2 JA |
53 | return 0; |
54 | } | |
55 | ||
36167d82 | 56 | static int fio_null_queue(struct thread_data fio_unused *td, struct io_u *io_u) |
a94ea28b | 57 | { |
65afa5f2 JA |
58 | struct null_data *nd = td->io_ops->data; |
59 | ||
60 | if (td->io_ops->flags & FIO_SYNCIO) | |
61 | return FIO_Q_COMPLETED; | |
ed8bd849 JA |
62 | if (nd->events) |
63 | return FIO_Q_BUSY; | |
65afa5f2 JA |
64 | |
65 | nd->io_us[nd->queued++] = io_u; | |
66 | return FIO_Q_QUEUED; | |
a94ea28b JA |
67 | } |
68 | ||
2fd233b7 JA |
69 | static int fio_null_setup(struct thread_data *td) |
70 | { | |
71 | struct fio_file *f; | |
af52b345 | 72 | unsigned int i; |
2fd233b7 | 73 | |
7bb48f84 JA |
74 | for_each_file(td, f, i) |
75 | f->real_file_size = -1ULL; | |
2fd233b7 | 76 | |
2fd233b7 JA |
77 | return 0; |
78 | } | |
79 | ||
b5af8293 JA |
80 | static int fio_null_open(struct thread_data fio_unused *td, |
81 | struct fio_file fio_unused *f) | |
82 | { | |
640e9421 | 83 | f->fd = 0; |
b5af8293 JA |
84 | return 0; |
85 | } | |
86 | ||
65afa5f2 JA |
87 | static void fio_null_cleanup(struct thread_data *td) |
88 | { | |
89 | struct null_data *nd = td->io_ops->data; | |
90 | ||
91 | if (nd) { | |
92 | if (nd->io_us) | |
93 | free(nd->io_us); | |
94 | free(nd); | |
95 | td->io_ops->data = NULL; | |
96 | } | |
97 | } | |
98 | ||
99 | static int fio_null_init(struct thread_data *td) | |
100 | { | |
101 | struct null_data *nd = malloc(sizeof(*nd)); | |
102 | ||
103 | memset(nd, 0, sizeof(*nd)); | |
104 | ||
2dc1bbeb JA |
105 | if (td->o.iodepth != 1) { |
106 | nd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *)); | |
107 | memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *)); | |
65afa5f2 JA |
108 | } else |
109 | td->io_ops->flags |= FIO_SYNCIO; | |
110 | ||
111 | td->io_ops->data = nd; | |
112 | return 0; | |
113 | } | |
114 | ||
a94ea28b JA |
115 | static struct ioengine_ops ioengine = { |
116 | .name = "null", | |
117 | .version = FIO_IOOPS_VERSION, | |
2fd233b7 | 118 | .setup = fio_null_setup, |
a94ea28b | 119 | .queue = fio_null_queue, |
65afa5f2 JA |
120 | .commit = fio_null_commit, |
121 | .getevents = fio_null_getevents, | |
122 | .event = fio_null_event, | |
123 | .init = fio_null_init, | |
124 | .cleanup = fio_null_cleanup, | |
b5af8293 | 125 | .open_file = fio_null_open, |
65afa5f2 | 126 | .flags = FIO_DISKLESSIO, |
a94ea28b JA |
127 | }; |
128 | ||
129 | static void fio_init fio_null_register(void) | |
130 | { | |
131 | register_ioengine(&ioengine); | |
132 | } | |
133 | ||
134 | static void fio_exit fio_null_unregister(void) | |
135 | { | |
136 | unregister_ioengine(&ioengine); | |
137 | } |