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 | 6 | * |
46a67478 DG |
7 | * It also can act as external C++ engine - compiled with: |
8 | * | |
9 | * g++ -O2 -g -shared -rdynamic -fPIC -o null.so null.c -DFIO_EXTERNAL_ENGINE | |
10 | * | |
a94ea28b JA |
11 | */ |
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <unistd.h> | |
15 | #include <errno.h> | |
16 | #include <assert.h> | |
17 | ||
18 | #include "../fio.h" | |
a94ea28b | 19 | |
65afa5f2 JA |
20 | struct null_data { |
21 | struct io_u **io_us; | |
22 | int queued; | |
23 | int events; | |
24 | }; | |
25 | ||
26 | static struct io_u *fio_null_event(struct thread_data *td, int event) | |
27 | { | |
46a67478 | 28 | struct null_data *nd = (struct null_data *) td->io_ops->data; |
65afa5f2 JA |
29 | |
30 | return nd->io_us[event]; | |
31 | } | |
32 | ||
e7d2e616 JA |
33 | static int fio_null_getevents(struct thread_data *td, unsigned int min_events, |
34 | unsigned int fio_unused max, | |
35 | struct timespec fio_unused *t) | |
65afa5f2 | 36 | { |
46a67478 | 37 | struct null_data *nd = (struct null_data *) td->io_ops->data; |
7401c088 JA |
38 | int ret = 0; |
39 | ||
40 | if (min_events) { | |
41 | ret = nd->events; | |
42 | nd->events = 0; | |
43 | } | |
65afa5f2 | 44 | |
65afa5f2 JA |
45 | return ret; |
46 | } | |
47 | ||
48 | static int fio_null_commit(struct thread_data *td) | |
49 | { | |
46a67478 | 50 | struct null_data *nd = (struct null_data *) td->io_ops->data; |
65afa5f2 | 51 | |
ed8bd849 | 52 | if (!nd->events) { |
46a67478 | 53 | #ifndef FIO_EXTERNAL_ENGINE |
838bc709 | 54 | io_u_mark_submit(td, nd->queued); |
46a67478 | 55 | #endif |
ed8bd849 JA |
56 | nd->events = nd->queued; |
57 | nd->queued = 0; | |
58 | } | |
59 | ||
65afa5f2 JA |
60 | return 0; |
61 | } | |
62 | ||
f0c48a70 | 63 | static int fio_null_queue(struct thread_data *td, struct io_u *io_u) |
a94ea28b | 64 | { |
46a67478 | 65 | struct null_data *nd = (struct null_data *) td->io_ops->data; |
65afa5f2 | 66 | |
7101d9c2 JA |
67 | fio_ro_check(td, io_u); |
68 | ||
65afa5f2 JA |
69 | if (td->io_ops->flags & FIO_SYNCIO) |
70 | return FIO_Q_COMPLETED; | |
ed8bd849 JA |
71 | if (nd->events) |
72 | return FIO_Q_BUSY; | |
65afa5f2 JA |
73 | |
74 | nd->io_us[nd->queued++] = io_u; | |
75 | return FIO_Q_QUEUED; | |
a94ea28b JA |
76 | } |
77 | ||
b5af8293 JA |
78 | static int fio_null_open(struct thread_data fio_unused *td, |
79 | struct fio_file fio_unused *f) | |
80 | { | |
81 | return 0; | |
82 | } | |
83 | ||
65afa5f2 JA |
84 | static void fio_null_cleanup(struct thread_data *td) |
85 | { | |
46a67478 | 86 | struct null_data *nd = (struct null_data *) td->io_ops->data; |
65afa5f2 JA |
87 | |
88 | if (nd) { | |
89 | if (nd->io_us) | |
90 | free(nd->io_us); | |
91 | free(nd); | |
65afa5f2 JA |
92 | } |
93 | } | |
94 | ||
95 | static int fio_null_init(struct thread_data *td) | |
96 | { | |
46a67478 | 97 | struct null_data *nd = (struct null_data *) malloc(sizeof(*nd)); |
65afa5f2 JA |
98 | |
99 | memset(nd, 0, sizeof(*nd)); | |
100 | ||
2dc1bbeb | 101 | if (td->o.iodepth != 1) { |
46a67478 | 102 | nd->io_us = (struct io_u **) malloc(td->o.iodepth * sizeof(struct io_u *)); |
2dc1bbeb | 103 | memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *)); |
65afa5f2 JA |
104 | } else |
105 | td->io_ops->flags |= FIO_SYNCIO; | |
106 | ||
107 | td->io_ops->data = nd; | |
108 | return 0; | |
109 | } | |
110 | ||
46a67478 | 111 | #ifndef __cplusplus |
a94ea28b JA |
112 | static struct ioengine_ops ioengine = { |
113 | .name = "null", | |
114 | .version = FIO_IOOPS_VERSION, | |
a94ea28b | 115 | .queue = fio_null_queue, |
65afa5f2 JA |
116 | .commit = fio_null_commit, |
117 | .getevents = fio_null_getevents, | |
118 | .event = fio_null_event, | |
119 | .init = fio_null_init, | |
120 | .cleanup = fio_null_cleanup, | |
b5af8293 | 121 | .open_file = fio_null_open, |
5c57c084 | 122 | .flags = FIO_DISKLESSIO | FIO_FAKEIO, |
a94ea28b JA |
123 | }; |
124 | ||
125 | static void fio_init fio_null_register(void) | |
126 | { | |
127 | register_ioengine(&ioengine); | |
128 | } | |
129 | ||
130 | static void fio_exit fio_null_unregister(void) | |
131 | { | |
132 | unregister_ioengine(&ioengine); | |
133 | } | |
46a67478 DG |
134 | |
135 | #else | |
136 | ||
137 | #ifdef FIO_EXTERNAL_ENGINE | |
138 | extern "C" { | |
8d6ecac2 JA |
139 | void get_ioengine(struct ioengine_ops **ioengine_ptr) |
140 | { | |
46a67478 | 141 | struct ioengine_ops *ioengine; |
8d6ecac2 | 142 | |
46a67478 DG |
143 | *ioengine_ptr = (struct ioengine_ops *) malloc(sizeof(struct ioengine_ops)); |
144 | ioengine = *ioengine_ptr; | |
145 | ||
146 | strcpy(ioengine->name, "cpp_null"); | |
147 | ioengine->version = FIO_IOOPS_VERSION; | |
148 | ioengine->queue = fio_null_queue; | |
149 | ioengine->commit = fio_null_commit; | |
150 | ioengine->getevents = fio_null_getevents; | |
151 | ioengine->event = fio_null_event; | |
152 | ioengine->init = fio_null_init; | |
153 | ioengine->cleanup = fio_null_cleanup; | |
154 | ioengine->open_file = fio_null_open; | |
5c57c084 | 155 | ioengine->flags = FIO_DISKLESSIO | FIO_FAKEIO; |
46a67478 DG |
156 | } |
157 | } | |
158 | #endif /* FIO_EXTERNAL_ENGINE */ | |
159 | ||
160 | #endif /* __cplusplus */ |