1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* The io parts of the fio tool, includes workers for sync and mmap'ed
* io, as well as both posix and linux libaio support.
*
* sync io is implemented on top of aio.
*
* This is not really specific to fio, if the get_io_u/put_io_u and
* structures was pulled into this as well it would be a perfectly
* generic io engine that could be used for other projects.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <dlfcn.h>
#include "fio.h"
#include "os.h"
static LIST_HEAD(engine_list);
static int check_engine_ops(struct ioengine_ops *ops)
{
if (ops->version != FIO_IOOPS_VERSION) {
log_err("bad ioops version %d (want %d)\n", ops->version, FIO_IOOPS_VERSION);
return 1;
}
/*
* cpu thread doesn't need to provide anything
*/
if (ops->flags & FIO_CPUIO)
return 0;
if (!ops->event) {
log_err("%s: no event handler)\n", ops->name);
return 1;
}
if (!ops->getevents) {
log_err("%s: no getevents handler)\n", ops->name);
return 1;
}
if (!ops->queue) {
log_err("%s: no queue handler)\n", ops->name);
return 1;
}
return 0;
}
void unregister_ioengine(struct ioengine_ops *ops)
{
list_del(&ops->list);
INIT_LIST_HEAD(&ops->list);
}
int register_ioengine(struct ioengine_ops *ops)
{
if (check_engine_ops(ops))
return 1;
INIT_LIST_HEAD(&ops->list);
list_add_tail(&ops->list, &engine_list);
return 0;
}
static struct ioengine_ops *find_ioengine(const char *name)
{
struct ioengine_ops *ops;
struct list_head *entry;
char engine[16];
strncpy(engine, name, sizeof(engine) - 1);
if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
strcpy(engine, "libaio");
list_for_each(entry, &engine_list) {
ops = list_entry(entry, struct ioengine_ops, list);
if (!strcmp(engine, ops->name))
return ops;
}
return NULL;
}
static struct ioengine_ops *dlopen_ioengine(struct thread_data *td,
const char *engine_lib)
{
struct ioengine_ops *ops;
void *dlhandle;
dlerror();
dlhandle = dlopen(engine_lib, RTLD_LAZY);
if (!dlhandle) {
td_vmsg(td, -1, dlerror());
return NULL;
}
/*
* Unlike the included modules, external engines should have a
* non-static ioengine structure that we can reference.
*/
ops = dlsym(dlhandle, "ioengine");
if (!ops) {
td_vmsg(td, -1, dlerror());
dlclose(dlhandle);
return NULL;
}
ops->dlhandle = dlhandle;
return ops;
}
struct ioengine_ops *load_ioengine(struct thread_data *td, const char *name)
{
struct ioengine_ops *ops, *ret;
char engine[16];
strncpy(engine, name, sizeof(engine) - 1);
/*
* linux libaio has alias names, so convert to what we want
*/
if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
strcpy(engine, "libaio");
ops = find_ioengine(engine);
if (!ops)
ops = dlopen_ioengine(td, name);
if (!ops) {
log_err("fio: engine %s not loadable\n", name);
return NULL;
}
/*
* Check that the required methods are there.
*/
if (check_engine_ops(ops))
return NULL;
ret = malloc(sizeof(*ret));
memcpy(ret, ops, sizeof(*ret));
ret->data = NULL;
return ret;
}
void close_ioengine(struct thread_data *td)
{
if (td->io_ops->cleanup)
td->io_ops->cleanup(td);
if (td->io_ops->dlhandle)
dlclose(td->io_ops->dlhandle);
free(td->io_ops);
td->io_ops = NULL;
}
int td_io_prep(struct thread_data *td, struct io_u *io_u)
{
if (td->io_ops->prep && td->io_ops->prep(td, io_u))
return 1;
return 0;
}
int td_io_getevents(struct thread_data *td, int min, int max,
struct timespec *t)
{
return td->io_ops->getevents(td, min, max, t);
}
int td_io_queue(struct thread_data *td, struct io_u *io_u)
{
fio_gettime(&io_u->issue_time, NULL);
return td->io_ops->queue(td, io_u);
}
int td_io_init(struct thread_data *td)
{
if (td->io_ops->init)
return td->io_ops->init(td);
return 0;
}
|
