Move setup_rate() out of log.c
[fio.git] / ioengines.c
CommitLineData
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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>
0c6e7517 17#include <assert.h>
8c16d840 18
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19#include "fio.h"
20#include "os.h"
21
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22static LIST_HEAD(engine_list);
23
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24static int check_engine_ops(struct ioengine_ops *ops)
25{
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26 if (ops->version != FIO_IOOPS_VERSION) {
27 log_err("bad ioops version %d (want %d)\n", ops->version, FIO_IOOPS_VERSION);
28 return 1;
29 }
30
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31 if (!ops->queue) {
32 log_err("%s: no queue handler\n", ops->name);
33 return 1;
34 }
35
36 /*
37 * sync engines only need a ->queue()
38 */
39 if (ops->flags & FIO_SYNCIO)
40 return 0;
41
8c16d840 42 if (!ops->event) {
36167d82 43 log_err("%s: no event handler\n", ops->name);
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44 return 1;
45 }
46 if (!ops->getevents) {
36167d82 47 log_err("%s: no getevents handler\n", ops->name);
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48 return 1;
49 }
50 if (!ops->queue) {
36167d82 51 log_err("%s: no queue handler\n", ops->name);
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52 return 1;
53 }
54
55 return 0;
56}
57
5f350952 58void unregister_ioengine(struct ioengine_ops *ops)
ebac4655 59{
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60 list_del(&ops->list);
61 INIT_LIST_HEAD(&ops->list);
62}
63
b2fdda43 64void register_ioengine(struct ioengine_ops *ops)
5f350952 65{
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66 INIT_LIST_HEAD(&ops->list);
67 list_add_tail(&ops->list, &engine_list);
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68}
69
70static struct ioengine_ops *find_ioengine(const char *name)
71{
72 struct ioengine_ops *ops;
73 struct list_head *entry;
ebac4655 74
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75 list_for_each(entry, &engine_list) {
76 ops = list_entry(entry, struct ioengine_ops, list);
bc5b77a8 77 if (!strcmp(name, ops->name))
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78 return ops;
79 }
80
81 return NULL;
82}
83
84static struct ioengine_ops *dlopen_ioengine(struct thread_data *td,
85 const char *engine_lib)
86{
87 struct ioengine_ops *ops;
88 void *dlhandle;
89
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90 dlerror();
91 dlhandle = dlopen(engine_lib, RTLD_LAZY);
d4dbaaa8 92 if (!dlhandle) {
e1161c32 93 td_vmsg(td, -1, dlerror(), "dlopen");
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94 return NULL;
95 }
8756e4d4 96
da51c050
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97 /*
98 * Unlike the included modules, external engines should have a
99 * non-static ioengine structure that we can reference.
100 */
2866c82d 101 ops = dlsym(dlhandle, "ioengine");
d4dbaaa8 102 if (!ops) {
e1161c32 103 td_vmsg(td, -1, dlerror(), "dlsym");
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104 dlclose(dlhandle);
105 return NULL;
106 }
8756e4d4 107
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108 ops->dlhandle = dlhandle;
109 return ops;
110}
111
112struct ioengine_ops *load_ioengine(struct thread_data *td, const char *name)
113{
114 struct ioengine_ops *ops, *ret;
115 char engine[16];
116
117 strncpy(engine, name, sizeof(engine) - 1);
118
119 /*
120 * linux libaio has alias names, so convert to what we want
121 */
122 if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
123 strcpy(engine, "libaio");
124
125 ops = find_ioengine(engine);
126 if (!ops)
127 ops = dlopen_ioengine(td, name);
128
129 if (!ops) {
130 log_err("fio: engine %s not loadable\n", name);
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131 return NULL;
132 }
133
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134 /*
135 * Check that the required methods are there.
136 */
5f350952 137 if (check_engine_ops(ops))
8c16d840 138 return NULL;
8c16d840 139
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140 ret = malloc(sizeof(*ret));
141 memcpy(ret, ops, sizeof(*ret));
142 ret->data = NULL;
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143
144 return ret;
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145}
146
2866c82d 147void close_ioengine(struct thread_data *td)
8756e4d4 148{
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149 if (td->io_ops->cleanup)
150 td->io_ops->cleanup(td);
b990b5c0 151
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152 if (td->io_ops->dlhandle)
153 dlclose(td->io_ops->dlhandle);
154
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155 free(td->io_ops);
156 td->io_ops = NULL;
b990b5c0 157}
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158
159int td_io_prep(struct thread_data *td, struct io_u *io_u)
160{
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161 if (td->io_ops->prep)
162 return td->io_ops->prep(td, io_u);
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163
164 return 0;
165}
166
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167int td_io_getevents(struct thread_data *td, int min, int max,
168 struct timespec *t)
169{
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170 if (min > 0 && td->io_ops->commit) {
171 int r = td->io_ops->commit(td);
172
173 if (r < 0)
174 return r;
175 }
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176 if (td->io_ops->getevents)
177 return td->io_ops->getevents(td, min, max, t);
178
179 return 0;
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180}
181
182int td_io_queue(struct thread_data *td, struct io_u *io_u)
183{
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184 int ret;
185
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186 assert((io_u->flags & IO_U_F_FLIGHT) == 0);
187 io_u->flags |= IO_U_F_FLIGHT;
188
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189 assert(io_u->file->flags & FIO_FILE_OPEN);
190
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191 io_u->error = 0;
192 io_u->resid = 0;
193
433afcb4 194 if (td->io_ops->flags & FIO_SYNCIO) {
5aeb77df 195 fio_gettime(&io_u->issue_time, NULL);
10ba535a 196
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197 /*
198 * for a sync engine, set the timeout upfront
199 */
200 if (mtime_since(&td->timeout_end, &io_u->issue_time) < IO_U_TIMEOUT)
201 io_u_set_timeout(td);
202 }
203
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204 if (io_u->ddir != DDIR_SYNC)
205 td->io_issues[io_u->ddir]++;
206
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207 io_u_mark_depth(td, io_u);
208
7e77dd02 209 ret = td->io_ops->queue(td, io_u);
5aeb77df 210
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211 if (ret == FIO_Q_QUEUED || ret == FIO_Q_COMPLETED)
212 get_file(io_u->file);
213
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214 if (ret == FIO_Q_QUEUED) {
215 int r;
216
cb5ab512 217 td->io_u_queued++;
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218 if (td->io_u_queued > td->iodepth_batch) {
219 r = td_io_commit(td);
220 if (r < 0)
221 return r;
222 }
223 }
cb5ab512 224
433afcb4 225 if ((td->io_ops->flags & FIO_SYNCIO) == 0) {
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226 fio_gettime(&io_u->issue_time, NULL);
227
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228 /*
229 * async engine, set the timeout here
230 */
231 if (ret == FIO_Q_QUEUED &&
232 mtime_since(&td->timeout_end, &io_u->issue_time) < IO_U_TIMEOUT)
233 io_u_set_timeout(td);
234 }
235
7e77dd02 236 return ret;
10ba535a 237}
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238
239int td_io_init(struct thread_data *td)
240{
241 if (td->io_ops->init)
242 return td->io_ops->init(td);
243
244 return 0;
245}
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246
247int td_io_commit(struct thread_data *td)
248{
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249 if (!td->cur_depth)
250 return 0;
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251
252 td->io_u_queued = 0;
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253 if (td->io_ops->commit)
254 return td->io_ops->commit(td);
255
256 return 0;
257}
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258
259int td_io_open_file(struct thread_data *td, struct fio_file *f)
260{
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261 if (td->io_ops->open_file(td, f))
262 return 1;
b5af8293 263
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264 f->last_free_lookup = 0;
265 f->last_completed_pos = 0;
266 f->last_pos = 0;
f11bd94d 267 f->flags |= FIO_FILE_OPEN;
0ad920e7 268 f->flags &= ~FIO_FILE_CLOSING;
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269
270 if (f->file_map)
271 memset(f->file_map, 0, f->num_maps * sizeof(long));
272
273 td->nr_open_files++;
0ad920e7 274 get_file(f);
a978ba68 275 return 0;
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276}
277
278void td_io_close_file(struct thread_data *td, struct fio_file *f)
279{
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280 /*
281 * mark as closing, do real close when last io on it has completed
282 */
283 f->flags |= FIO_FILE_CLOSING;
284
285 put_file(td, f);
b5af8293 286}
0ad920e7 287