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 | ||
7401c088 | 48 | nd->events += nd->queued; |
65afa5f2 JA |
49 | nd->queued = 0; |
50 | return 0; | |
51 | } | |
52 | ||
36167d82 | 53 | static int fio_null_queue(struct thread_data fio_unused *td, struct io_u *io_u) |
a94ea28b | 54 | { |
65afa5f2 JA |
55 | struct null_data *nd = td->io_ops->data; |
56 | ||
57 | if (td->io_ops->flags & FIO_SYNCIO) | |
58 | return FIO_Q_COMPLETED; | |
59 | ||
60 | nd->io_us[nd->queued++] = io_u; | |
61 | return FIO_Q_QUEUED; | |
a94ea28b JA |
62 | } |
63 | ||
2fd233b7 JA |
64 | static int fio_null_setup(struct thread_data *td) |
65 | { | |
66 | struct fio_file *f; | |
af52b345 | 67 | unsigned int i; |
2fd233b7 | 68 | |
2dc1bbeb | 69 | if (!td->o.size) { |
2fd233b7 JA |
70 | log_err("fio: need size= set\n"); |
71 | return 1; | |
72 | } | |
73 | ||
2dc1bbeb | 74 | td->io_size = td->o.size; |
2fd233b7 JA |
75 | td->total_io_size = td->io_size; |
76 | ||
77 | for_each_file(td, f, i) { | |
2dc1bbeb | 78 | f->real_file_size = td->total_io_size / td->o.nr_files; |
2fd233b7 JA |
79 | f->file_size = f->real_file_size; |
80 | } | |
81 | ||
2fd233b7 JA |
82 | return 0; |
83 | } | |
84 | ||
b5af8293 JA |
85 | static int fio_null_open(struct thread_data fio_unused *td, |
86 | struct fio_file fio_unused *f) | |
87 | { | |
640e9421 | 88 | f->fd = 0; |
b5af8293 JA |
89 | return 0; |
90 | } | |
91 | ||
65afa5f2 JA |
92 | static void fio_null_cleanup(struct thread_data *td) |
93 | { | |
94 | struct null_data *nd = td->io_ops->data; | |
95 | ||
96 | if (nd) { | |
97 | if (nd->io_us) | |
98 | free(nd->io_us); | |
99 | free(nd); | |
100 | td->io_ops->data = NULL; | |
101 | } | |
102 | } | |
103 | ||
104 | static int fio_null_init(struct thread_data *td) | |
105 | { | |
106 | struct null_data *nd = malloc(sizeof(*nd)); | |
107 | ||
108 | memset(nd, 0, sizeof(*nd)); | |
109 | ||
2dc1bbeb JA |
110 | if (td->o.iodepth != 1) { |
111 | nd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *)); | |
112 | memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *)); | |
65afa5f2 JA |
113 | } else |
114 | td->io_ops->flags |= FIO_SYNCIO; | |
115 | ||
116 | td->io_ops->data = nd; | |
117 | return 0; | |
118 | } | |
119 | ||
a94ea28b JA |
120 | static struct ioengine_ops ioengine = { |
121 | .name = "null", | |
122 | .version = FIO_IOOPS_VERSION, | |
2fd233b7 | 123 | .setup = fio_null_setup, |
a94ea28b | 124 | .queue = fio_null_queue, |
65afa5f2 JA |
125 | .commit = fio_null_commit, |
126 | .getevents = fio_null_getevents, | |
127 | .event = fio_null_event, | |
128 | .init = fio_null_init, | |
129 | .cleanup = fio_null_cleanup, | |
b5af8293 | 130 | .open_file = fio_null_open, |
65afa5f2 | 131 | .flags = FIO_DISKLESSIO, |
a94ea28b JA |
132 | }; |
133 | ||
134 | static void fio_init fio_null_register(void) | |
135 | { | |
136 | register_ioengine(&ioengine); | |
137 | } | |
138 | ||
139 | static void fio_exit fio_null_unregister(void) | |
140 | { | |
141 | unregister_ioengine(&ioengine); | |
142 | } |