Commit | Line | Data |
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ebac4655 JA |
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 | |
ebac4655 JA |
19 | #include "fio.h" |
20 | #include "os.h" | |
21 | ||
5f350952 JA |
22 | static LIST_HEAD(engine_list); |
23 | ||
8c16d840 JA |
24 | static int check_engine_ops(struct ioengine_ops *ops) |
25 | { | |
5f350952 JA |
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 | ||
8c16d840 JA |
31 | /* |
32 | * cpu thread doesn't need to provide anything | |
33 | */ | |
34 | if (ops->flags & FIO_CPUIO) | |
35 | return 0; | |
36 | ||
36167d82 JA |
37 | if (!ops->queue) { |
38 | log_err("%s: no queue handler\n", ops->name); | |
39 | return 1; | |
40 | } | |
41 | ||
42 | /* | |
43 | * sync engines only need a ->queue() | |
44 | */ | |
45 | if (ops->flags & FIO_SYNCIO) | |
46 | return 0; | |
47 | ||
8c16d840 | 48 | if (!ops->event) { |
36167d82 | 49 | log_err("%s: no event handler\n", ops->name); |
8c16d840 JA |
50 | return 1; |
51 | } | |
52 | if (!ops->getevents) { | |
36167d82 | 53 | log_err("%s: no getevents handler\n", ops->name); |
8c16d840 JA |
54 | return 1; |
55 | } | |
56 | if (!ops->queue) { | |
36167d82 | 57 | log_err("%s: no queue handler\n", ops->name); |
8c16d840 JA |
58 | return 1; |
59 | } | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
5f350952 | 64 | void unregister_ioengine(struct ioengine_ops *ops) |
ebac4655 | 65 | { |
5f350952 JA |
66 | list_del(&ops->list); |
67 | INIT_LIST_HEAD(&ops->list); | |
68 | } | |
69 | ||
b2fdda43 | 70 | void register_ioengine(struct ioengine_ops *ops) |
5f350952 | 71 | { |
5f350952 JA |
72 | INIT_LIST_HEAD(&ops->list); |
73 | list_add_tail(&ops->list, &engine_list); | |
5f350952 JA |
74 | } |
75 | ||
76 | static struct ioengine_ops *find_ioengine(const char *name) | |
77 | { | |
78 | struct ioengine_ops *ops; | |
79 | struct list_head *entry; | |
80 | char engine[16]; | |
ebac4655 | 81 | |
0bbab0e7 | 82 | strncpy(engine, name, sizeof(engine) - 1); |
ebac4655 | 83 | |
2866c82d JA |
84 | if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3)) |
85 | strcpy(engine, "libaio"); | |
ebac4655 | 86 | |
5f350952 JA |
87 | list_for_each(entry, &engine_list) { |
88 | ops = list_entry(entry, struct ioengine_ops, list); | |
89 | if (!strcmp(engine, ops->name)) | |
90 | return ops; | |
91 | } | |
92 | ||
93 | return NULL; | |
94 | } | |
95 | ||
96 | static struct ioengine_ops *dlopen_ioengine(struct thread_data *td, | |
97 | const char *engine_lib) | |
98 | { | |
99 | struct ioengine_ops *ops; | |
100 | void *dlhandle; | |
101 | ||
2866c82d JA |
102 | dlerror(); |
103 | dlhandle = dlopen(engine_lib, RTLD_LAZY); | |
d4dbaaa8 | 104 | if (!dlhandle) { |
e1161c32 | 105 | td_vmsg(td, -1, dlerror(), "dlopen"); |
d4dbaaa8 JA |
106 | return NULL; |
107 | } | |
8756e4d4 | 108 | |
da51c050 JA |
109 | /* |
110 | * Unlike the included modules, external engines should have a | |
111 | * non-static ioengine structure that we can reference. | |
112 | */ | |
2866c82d | 113 | ops = dlsym(dlhandle, "ioengine"); |
d4dbaaa8 | 114 | if (!ops) { |
e1161c32 | 115 | td_vmsg(td, -1, dlerror(), "dlsym"); |
d4dbaaa8 JA |
116 | dlclose(dlhandle); |
117 | return NULL; | |
118 | } | |
8756e4d4 | 119 | |
5f350952 JA |
120 | ops->dlhandle = dlhandle; |
121 | return ops; | |
122 | } | |
123 | ||
124 | struct ioengine_ops *load_ioengine(struct thread_data *td, const char *name) | |
125 | { | |
126 | struct ioengine_ops *ops, *ret; | |
127 | char engine[16]; | |
128 | ||
129 | strncpy(engine, name, sizeof(engine) - 1); | |
130 | ||
131 | /* | |
132 | * linux libaio has alias names, so convert to what we want | |
133 | */ | |
134 | if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3)) | |
135 | strcpy(engine, "libaio"); | |
136 | ||
137 | ops = find_ioengine(engine); | |
138 | if (!ops) | |
139 | ops = dlopen_ioengine(td, name); | |
140 | ||
141 | if (!ops) { | |
142 | log_err("fio: engine %s not loadable\n", name); | |
b902ceb5 JA |
143 | return NULL; |
144 | } | |
145 | ||
8c16d840 JA |
146 | /* |
147 | * Check that the required methods are there. | |
148 | */ | |
5f350952 | 149 | if (check_engine_ops(ops)) |
8c16d840 | 150 | return NULL; |
8c16d840 | 151 | |
84585003 JA |
152 | ret = malloc(sizeof(*ret)); |
153 | memcpy(ret, ops, sizeof(*ret)); | |
154 | ret->data = NULL; | |
84585003 JA |
155 | |
156 | return ret; | |
8756e4d4 JA |
157 | } |
158 | ||
2866c82d | 159 | void close_ioengine(struct thread_data *td) |
8756e4d4 | 160 | { |
2866c82d JA |
161 | if (td->io_ops->cleanup) |
162 | td->io_ops->cleanup(td); | |
b990b5c0 | 163 | |
5f350952 JA |
164 | if (td->io_ops->dlhandle) |
165 | dlclose(td->io_ops->dlhandle); | |
166 | ||
19a98c41 JA |
167 | #if 0 |
168 | /* we can't do this for threads, so just leak it, it's exiting */ | |
84585003 | 169 | free(td->io_ops); |
19a98c41 | 170 | #endif |
84585003 | 171 | td->io_ops = NULL; |
b990b5c0 | 172 | } |
10ba535a JA |
173 | |
174 | int td_io_prep(struct thread_data *td, struct io_u *io_u) | |
175 | { | |
36167d82 JA |
176 | if (td->io_ops->prep) |
177 | return td->io_ops->prep(td, io_u); | |
10ba535a JA |
178 | |
179 | return 0; | |
180 | } | |
181 | ||
10ba535a JA |
182 | int td_io_getevents(struct thread_data *td, int min, int max, |
183 | struct timespec *t) | |
184 | { | |
face81b2 JA |
185 | if (min > 0 && td->io_ops->commit) { |
186 | int r = td->io_ops->commit(td); | |
187 | ||
188 | if (r < 0) | |
189 | return r; | |
190 | } | |
36167d82 JA |
191 | if (td->io_ops->getevents) |
192 | return td->io_ops->getevents(td, min, max, t); | |
193 | ||
194 | return 0; | |
10ba535a JA |
195 | } |
196 | ||
197 | int td_io_queue(struct thread_data *td, struct io_u *io_u) | |
198 | { | |
7e77dd02 JA |
199 | int ret; |
200 | ||
0c6e7517 JA |
201 | assert((io_u->flags & IO_U_F_FLIGHT) == 0); |
202 | io_u->flags |= IO_U_F_FLIGHT; | |
203 | ||
433afcb4 | 204 | if (td->io_ops->flags & FIO_SYNCIO) { |
5aeb77df | 205 | fio_gettime(&io_u->issue_time, NULL); |
10ba535a | 206 | |
433afcb4 JA |
207 | /* |
208 | * for a sync engine, set the timeout upfront | |
209 | */ | |
210 | if (mtime_since(&td->timeout_end, &io_u->issue_time) < IO_U_TIMEOUT) | |
211 | io_u_set_timeout(td); | |
212 | } | |
213 | ||
755200a3 JA |
214 | if (io_u->ddir != DDIR_SYNC) |
215 | td->io_issues[io_u->ddir]++; | |
216 | ||
7e77dd02 | 217 | ret = td->io_ops->queue(td, io_u); |
5aeb77df | 218 | |
cb5ab512 JA |
219 | if (ret == FIO_Q_QUEUED) |
220 | td->io_u_queued++; | |
221 | ||
433afcb4 | 222 | if ((td->io_ops->flags & FIO_SYNCIO) == 0) { |
5aeb77df JA |
223 | fio_gettime(&io_u->issue_time, NULL); |
224 | ||
433afcb4 JA |
225 | /* |
226 | * async engine, set the timeout here | |
227 | */ | |
228 | if (ret == FIO_Q_QUEUED && | |
229 | mtime_since(&td->timeout_end, &io_u->issue_time) < IO_U_TIMEOUT) | |
230 | io_u_set_timeout(td); | |
231 | } | |
232 | ||
7e77dd02 | 233 | return ret; |
10ba535a | 234 | } |
8c16d840 JA |
235 | |
236 | int td_io_init(struct thread_data *td) | |
237 | { | |
238 | if (td->io_ops->init) | |
239 | return td->io_ops->init(td); | |
240 | ||
241 | return 0; | |
242 | } | |
755200a3 JA |
243 | |
244 | int td_io_commit(struct thread_data *td) | |
245 | { | |
e1161c32 JA |
246 | if (!td->cur_depth) |
247 | return 0; | |
cb5ab512 JA |
248 | |
249 | td->io_u_queued = 0; | |
755200a3 JA |
250 | if (td->io_ops->commit) |
251 | return td->io_ops->commit(td); | |
252 | ||
253 | return 0; | |
254 | } |