[PATCH] syslet: fix leak of ring and ahu
[fio.git] / ioengines.c
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1/*
2 * The io parts of the fio tool, includes workers for sync and mmap'ed
3 * io, as well as both posix and linux libaio support.
4 *
5 * sync io is implemented on top of aio.
6 *
7 * This is not really specific to fio, if the get_io_u/put_io_u and
8 * structures was pulled into this as well it would be a perfectly
9 * generic io engine that could be used for other projects.
10 *
11 */
12#include <stdio.h>
13#include <stdlib.h>
14#include <unistd.h>
5c4e1dbc 15#include <string.h>
2866c82d 16#include <dlfcn.h>
8c16d840 17
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18#include "fio.h"
19#include "os.h"
20
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21static LIST_HEAD(engine_list);
22
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23static int check_engine_ops(struct ioengine_ops *ops)
24{
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25 if (ops->version != FIO_IOOPS_VERSION) {
26 log_err("bad ioops version %d (want %d)\n", ops->version, FIO_IOOPS_VERSION);
27 return 1;
28 }
29
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30 /*
31 * cpu thread doesn't need to provide anything
32 */
33 if (ops->flags & FIO_CPUIO)
34 return 0;
35
36 if (!ops->event) {
37 log_err("%s: no event handler)\n", ops->name);
38 return 1;
39 }
40 if (!ops->getevents) {
41 log_err("%s: no getevents handler)\n", ops->name);
42 return 1;
43 }
44 if (!ops->queue) {
45 log_err("%s: no queue handler)\n", ops->name);
46 return 1;
47 }
48
49 return 0;
50}
51
5f350952 52void unregister_ioengine(struct ioengine_ops *ops)
ebac4655 53{
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54 list_del(&ops->list);
55 INIT_LIST_HEAD(&ops->list);
56}
57
58int register_ioengine(struct ioengine_ops *ops)
59{
60 if (check_engine_ops(ops))
61 return 1;
62
63 INIT_LIST_HEAD(&ops->list);
64 list_add_tail(&ops->list, &engine_list);
65 return 0;
66}
67
68static struct ioengine_ops *find_ioengine(const char *name)
69{
70 struct ioengine_ops *ops;
71 struct list_head *entry;
72 char engine[16];
ebac4655 73
0bbab0e7 74 strncpy(engine, name, sizeof(engine) - 1);
ebac4655 75
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76 if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
77 strcpy(engine, "libaio");
ebac4655 78
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79 list_for_each(entry, &engine_list) {
80 ops = list_entry(entry, struct ioengine_ops, list);
81 if (!strcmp(engine, ops->name))
82 return ops;
83 }
84
85 return NULL;
86}
87
88static struct ioengine_ops *dlopen_ioengine(struct thread_data *td,
89 const char *engine_lib)
90{
91 struct ioengine_ops *ops;
92 void *dlhandle;
93
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94 dlerror();
95 dlhandle = dlopen(engine_lib, RTLD_LAZY);
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96 if (!dlhandle) {
97 td_vmsg(td, -1, dlerror());
98 return NULL;
99 }
8756e4d4 100
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101 /*
102 * Unlike the included modules, external engines should have a
103 * non-static ioengine structure that we can reference.
104 */
2866c82d 105 ops = dlsym(dlhandle, "ioengine");
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106 if (!ops) {
107 td_vmsg(td, -1, dlerror());
108 dlclose(dlhandle);
109 return NULL;
110 }
8756e4d4 111
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112 ops->dlhandle = dlhandle;
113 return ops;
114}
115
116struct ioengine_ops *load_ioengine(struct thread_data *td, const char *name)
117{
118 struct ioengine_ops *ops, *ret;
119 char engine[16];
120
121 strncpy(engine, name, sizeof(engine) - 1);
122
123 /*
124 * linux libaio has alias names, so convert to what we want
125 */
126 if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
127 strcpy(engine, "libaio");
128
129 ops = find_ioengine(engine);
130 if (!ops)
131 ops = dlopen_ioengine(td, name);
132
133 if (!ops) {
134 log_err("fio: engine %s not loadable\n", name);
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135 return NULL;
136 }
137
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138 /*
139 * Check that the required methods are there.
140 */
5f350952 141 if (check_engine_ops(ops))
8c16d840 142 return NULL;
8c16d840 143
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144 ret = malloc(sizeof(*ret));
145 memcpy(ret, ops, sizeof(*ret));
146 ret->data = NULL;
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147
148 return ret;
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149}
150
2866c82d 151void close_ioengine(struct thread_data *td)
8756e4d4 152{
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153 if (td->io_ops->cleanup)
154 td->io_ops->cleanup(td);
b990b5c0 155
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156 if (td->io_ops->dlhandle)
157 dlclose(td->io_ops->dlhandle);
158
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159 free(td->io_ops);
160 td->io_ops = NULL;
b990b5c0 161}
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162
163int td_io_prep(struct thread_data *td, struct io_u *io_u)
164{
165 if (td->io_ops->prep && td->io_ops->prep(td, io_u))
166 return 1;
167
168 return 0;
169}
170
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171int td_io_getevents(struct thread_data *td, int min, int max,
172 struct timespec *t)
173{
174 return td->io_ops->getevents(td, min, max, t);
175}
176
177int td_io_queue(struct thread_data *td, struct io_u *io_u)
178{
02bcaa8c 179 fio_gettime(&io_u->issue_time, NULL);
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180
181 return td->io_ops->queue(td, io_u);
182}
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183
184int td_io_init(struct thread_data *td)
185{
186 if (td->io_ops->init)
187 return td->io_ops->init(td);
188
189 return 0;
190}