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" | |
a94ea28b | 15 | |
65afa5f2 JA |
16 | struct null_data { |
17 | struct io_u **io_us; | |
18 | int queued; | |
19 | int events; | |
20 | }; | |
21 | ||
22 | static struct io_u *fio_null_event(struct thread_data *td, int event) | |
23 | { | |
24 | struct null_data *nd = td->io_ops->data; | |
25 | ||
26 | return nd->io_us[event]; | |
27 | } | |
28 | ||
e7d2e616 JA |
29 | static int fio_null_getevents(struct thread_data *td, unsigned int min_events, |
30 | unsigned int fio_unused max, | |
31 | struct timespec fio_unused *t) | |
65afa5f2 JA |
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 | 48 | if (!nd->events) { |
838bc709 | 49 | io_u_mark_submit(td, nd->queued); |
ed8bd849 JA |
50 | nd->events = nd->queued; |
51 | nd->queued = 0; | |
52 | } | |
53 | ||
65afa5f2 JA |
54 | return 0; |
55 | } | |
56 | ||
36167d82 | 57 | static int fio_null_queue(struct thread_data fio_unused *td, struct io_u *io_u) |
a94ea28b | 58 | { |
65afa5f2 JA |
59 | struct null_data *nd = td->io_ops->data; |
60 | ||
7101d9c2 JA |
61 | fio_ro_check(td, io_u); |
62 | ||
65afa5f2 JA |
63 | if (td->io_ops->flags & FIO_SYNCIO) |
64 | return FIO_Q_COMPLETED; | |
ed8bd849 JA |
65 | if (nd->events) |
66 | return FIO_Q_BUSY; | |
65afa5f2 JA |
67 | |
68 | nd->io_us[nd->queued++] = io_u; | |
69 | return FIO_Q_QUEUED; | |
a94ea28b JA |
70 | } |
71 | ||
b5af8293 JA |
72 | static int fio_null_open(struct thread_data fio_unused *td, |
73 | struct fio_file fio_unused *f) | |
74 | { | |
75 | return 0; | |
76 | } | |
77 | ||
65afa5f2 JA |
78 | static void fio_null_cleanup(struct thread_data *td) |
79 | { | |
80 | struct null_data *nd = td->io_ops->data; | |
81 | ||
82 | if (nd) { | |
83 | if (nd->io_us) | |
84 | free(nd->io_us); | |
85 | free(nd); | |
65afa5f2 JA |
86 | } |
87 | } | |
88 | ||
89 | static int fio_null_init(struct thread_data *td) | |
90 | { | |
91 | struct null_data *nd = malloc(sizeof(*nd)); | |
92 | ||
93 | memset(nd, 0, sizeof(*nd)); | |
94 | ||
2dc1bbeb JA |
95 | if (td->o.iodepth != 1) { |
96 | nd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *)); | |
97 | memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *)); | |
65afa5f2 JA |
98 | } else |
99 | td->io_ops->flags |= FIO_SYNCIO; | |
100 | ||
101 | td->io_ops->data = nd; | |
102 | return 0; | |
103 | } | |
104 | ||
a94ea28b JA |
105 | static struct ioengine_ops ioengine = { |
106 | .name = "null", | |
107 | .version = FIO_IOOPS_VERSION, | |
a94ea28b | 108 | .queue = fio_null_queue, |
65afa5f2 JA |
109 | .commit = fio_null_commit, |
110 | .getevents = fio_null_getevents, | |
111 | .event = fio_null_event, | |
112 | .init = fio_null_init, | |
113 | .cleanup = fio_null_cleanup, | |
b5af8293 | 114 | .open_file = fio_null_open, |
65afa5f2 | 115 | .flags = FIO_DISKLESSIO, |
a94ea28b JA |
116 | }; |
117 | ||
118 | static void fio_init fio_null_register(void) | |
119 | { | |
120 | register_ioengine(&ioengine); | |
121 | } | |
122 | ||
123 | static void fio_exit fio_null_unregister(void) | |
124 | { | |
125 | unregister_ioengine(&ioengine); | |
126 | } |