Commit | Line | Data |
---|---|---|
2866c82d | 1 | /* |
da751ca9 JA |
2 | * libaio engine |
3 | * | |
4 | * IO engine using the Linux native aio interface. | |
2866c82d JA |
5 | * |
6 | */ | |
7 | #include <stdio.h> | |
8 | #include <stdlib.h> | |
9 | #include <unistd.h> | |
10 | #include <errno.h> | |
11 | #include <assert.h> | |
5f350952 JA |
12 | |
13 | #include "../fio.h" | |
2866c82d | 14 | |
34cfcdaf JA |
15 | #ifdef FIO_HAVE_LIBAIO |
16 | ||
2866c82d JA |
17 | #define ev_to_iou(ev) (struct io_u *) ((unsigned long) (ev)->obj) |
18 | ||
19 | struct libaio_data { | |
20 | io_context_t aio_ctx; | |
21 | struct io_event *aio_events; | |
755200a3 | 22 | struct iocb **iocbs; |
7e77dd02 | 23 | struct io_u **io_us; |
755200a3 | 24 | int iocbs_nr; |
2866c82d JA |
25 | }; |
26 | ||
7a16dd02 | 27 | static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u) |
2866c82d | 28 | { |
53cdc686 JA |
29 | struct fio_file *f = io_u->file; |
30 | ||
2866c82d | 31 | if (io_u->ddir == DDIR_READ) |
cec6b55d | 32 | io_prep_pread(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); |
87dc1ab1 | 33 | else if (io_u->ddir == DDIR_WRITE) |
cec6b55d | 34 | io_prep_pwrite(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); |
5f9099ea | 35 | else if (ddir_sync(io_u->ddir)) |
87dc1ab1 | 36 | io_prep_fsync(&io_u->iocb, f->fd); |
2866c82d JA |
37 | |
38 | return 0; | |
39 | } | |
40 | ||
41 | static struct io_u *fio_libaio_event(struct thread_data *td, int event) | |
42 | { | |
43 | struct libaio_data *ld = td->io_ops->data; | |
f423479d JA |
44 | struct io_event *ev; |
45 | struct io_u *io_u; | |
2866c82d | 46 | |
f423479d JA |
47 | ev = ld->aio_events + event; |
48 | io_u = ev_to_iou(ev); | |
49 | ||
50 | if (ev->res != io_u->xfer_buflen) { | |
51 | if (ev->res > io_u->xfer_buflen) | |
52 | io_u->error = -ev->res; | |
53 | else | |
54 | io_u->resid = io_u->xfer_buflen - ev->res; | |
55 | } else | |
56 | io_u->error = 0; | |
57 | ||
58 | return io_u; | |
2866c82d JA |
59 | } |
60 | ||
675012f0 DE |
61 | struct aio_ring { |
62 | unsigned id; /** kernel internal index number */ | |
63 | unsigned nr; /** number of io_events */ | |
64 | unsigned head; | |
65 | unsigned tail; | |
c44b1ff5 | 66 | |
675012f0 DE |
67 | unsigned magic; |
68 | unsigned compat_features; | |
69 | unsigned incompat_features; | |
70 | unsigned header_length; /** size of aio_ring */ | |
71 | ||
72 | struct io_event events[0]; | |
73 | }; | |
74 | ||
75 | #define AIO_RING_MAGIC 0xa10a10a1 | |
76 | ||
77 | static int user_io_getevents(io_context_t aio_ctx, unsigned int max, | |
c44b1ff5 | 78 | struct io_event *events) |
675012f0 DE |
79 | { |
80 | long i = 0; | |
81 | unsigned head; | |
c44b1ff5 | 82 | struct aio_ring *ring = (struct aio_ring*) aio_ctx; |
675012f0 DE |
83 | |
84 | while (i < max) { | |
85 | head = ring->head; | |
86 | ||
87 | if (head == ring->tail) { | |
88 | /* There are no more completions */ | |
89 | break; | |
90 | } else { | |
91 | /* There is another completion to reap */ | |
92 | events[i] = ring->events[head]; | |
93 | read_barrier(); | |
c44b1ff5 | 94 | ring->head = (head + 1) % ring->nr; |
675012f0 DE |
95 | i++; |
96 | } | |
97 | } | |
98 | ||
99 | return i; | |
100 | } | |
101 | ||
e7d2e616 JA |
102 | static int fio_libaio_getevents(struct thread_data *td, unsigned int min, |
103 | unsigned int max, struct timespec *t) | |
2866c82d JA |
104 | { |
105 | struct libaio_data *ld = td->io_ops->data; | |
0b7fdba7 DE |
106 | unsigned actual_min = td->o.iodepth_batch_complete == 0 ? 0 : min; |
107 | int r, events = 0; | |
2866c82d JA |
108 | |
109 | do { | |
675012f0 DE |
110 | if (td->o.userspace_libaio_reap == 1 |
111 | && actual_min == 0 | |
112 | && ((struct aio_ring *)(ld->aio_ctx))->magic | |
113 | == AIO_RING_MAGIC) { | |
114 | r = user_io_getevents(ld->aio_ctx, max, | |
115 | ld->aio_events + events); | |
116 | } else { | |
117 | r = io_getevents(ld->aio_ctx, actual_min, | |
118 | max, ld->aio_events + events, t); | |
119 | } | |
0b7fdba7 DE |
120 | if (r >= 0) |
121 | events += r; | |
122 | else if (r == -EAGAIN) | |
2866c82d | 123 | usleep(100); |
0b7fdba7 DE |
124 | } while (events < min); |
125 | ||
126 | return r < 0 ? r : events; | |
2866c82d JA |
127 | } |
128 | ||
129 | static int fio_libaio_queue(struct thread_data *td, struct io_u *io_u) | |
130 | { | |
131 | struct libaio_data *ld = td->io_ops->data; | |
2866c82d | 132 | |
7101d9c2 JA |
133 | fio_ro_check(td, io_u); |
134 | ||
2dc1bbeb | 135 | if (ld->iocbs_nr == (int) td->o.iodepth) |
755200a3 JA |
136 | return FIO_Q_BUSY; |
137 | ||
138 | /* | |
139 | * fsync is tricky, since it can fail and we need to do it | |
140 | * serialized with other io. the reason is that linux doesn't | |
141 | * support aio fsync yet. So return busy for the case where we | |
142 | * have pending io, to let fio complete those first. | |
143 | */ | |
f011531e | 144 | if (ddir_sync(io_u->ddir)) { |
755200a3 JA |
145 | if (ld->iocbs_nr) |
146 | return FIO_Q_BUSY; | |
5f9099ea | 147 | |
f011531e | 148 | do_io_u_sync(td, io_u); |
755200a3 JA |
149 | return FIO_Q_COMPLETED; |
150 | } | |
151 | ||
a5f3027c JA |
152 | if (io_u->ddir == DDIR_TRIM) { |
153 | if (ld->iocbs_nr) | |
154 | return FIO_Q_BUSY; | |
155 | ||
156 | do_io_u_trim(td, io_u); | |
157 | return FIO_Q_COMPLETED; | |
158 | } | |
159 | ||
755200a3 | 160 | ld->iocbs[ld->iocbs_nr] = &io_u->iocb; |
7e77dd02 | 161 | ld->io_us[ld->iocbs_nr] = io_u; |
755200a3 JA |
162 | ld->iocbs_nr++; |
163 | return FIO_Q_QUEUED; | |
164 | } | |
165 | ||
7e77dd02 JA |
166 | static void fio_libaio_queued(struct thread_data *td, struct io_u **io_us, |
167 | unsigned int nr) | |
168 | { | |
169 | struct timeval now; | |
170 | unsigned int i; | |
171 | ||
12d9d841 JA |
172 | if (!fio_fill_issue_time(td)) |
173 | return; | |
174 | ||
7e77dd02 JA |
175 | fio_gettime(&now, NULL); |
176 | ||
177 | for (i = 0; i < nr; i++) { | |
178 | struct io_u *io_u = io_us[i]; | |
179 | ||
180 | memcpy(&io_u->issue_time, &now, sizeof(now)); | |
181 | io_u_queued(td, io_u); | |
182 | } | |
183 | } | |
184 | ||
755200a3 JA |
185 | static int fio_libaio_commit(struct thread_data *td) |
186 | { | |
187 | struct libaio_data *ld = td->io_ops->data; | |
188 | struct iocb **iocbs; | |
7e77dd02 | 189 | struct io_u **io_us; |
5e00c2c4 | 190 | int ret; |
755200a3 JA |
191 | |
192 | if (!ld->iocbs_nr) | |
193 | return 0; | |
194 | ||
7e77dd02 | 195 | io_us = ld->io_us; |
755200a3 | 196 | iocbs = ld->iocbs; |
2866c82d | 197 | do { |
5e00c2c4 JA |
198 | ret = io_submit(ld->aio_ctx, ld->iocbs_nr, iocbs); |
199 | if (ret > 0) { | |
7e77dd02 | 200 | fio_libaio_queued(td, io_us, ret); |
838bc709 | 201 | io_u_mark_submit(td, ret); |
5e00c2c4 | 202 | ld->iocbs_nr -= ret; |
7e77dd02 | 203 | io_us += ret; |
755200a3 | 204 | iocbs += ret; |
5e00c2c4 | 205 | ret = 0; |
838bc709 JA |
206 | } else if (!ret || ret == -EAGAIN || ret == -EINTR) { |
207 | if (!ret) | |
208 | io_u_mark_submit(td, ret); | |
2866c82d | 209 | continue; |
838bc709 | 210 | } else |
2866c82d | 211 | break; |
5e00c2c4 | 212 | } while (ld->iocbs_nr); |
2866c82d | 213 | |
36167d82 | 214 | return ret; |
2866c82d JA |
215 | } |
216 | ||
217 | static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u) | |
218 | { | |
219 | struct libaio_data *ld = td->io_ops->data; | |
220 | ||
221 | return io_cancel(ld->aio_ctx, &io_u->iocb, ld->aio_events); | |
222 | } | |
223 | ||
224 | static void fio_libaio_cleanup(struct thread_data *td) | |
225 | { | |
226 | struct libaio_data *ld = td->io_ops->data; | |
227 | ||
228 | if (ld) { | |
229 | io_destroy(ld->aio_ctx); | |
7e77dd02 JA |
230 | free(ld->aio_events); |
231 | free(ld->iocbs); | |
232 | free(ld->io_us); | |
2866c82d | 233 | free(ld); |
2866c82d JA |
234 | } |
235 | } | |
236 | ||
237 | static int fio_libaio_init(struct thread_data *td) | |
238 | { | |
239 | struct libaio_data *ld = malloc(sizeof(*ld)); | |
c1db2dce | 240 | int err; |
2866c82d JA |
241 | |
242 | memset(ld, 0, sizeof(*ld)); | |
c1db2dce JA |
243 | |
244 | err = io_queue_init(td->o.iodepth, &ld->aio_ctx); | |
245 | if (err) { | |
246 | td_verror(td, -err, "io_queue_init"); | |
75de55ac | 247 | log_err("fio: check /proc/sys/fs/aio-max-nr\n"); |
cb781c75 | 248 | free(ld); |
2866c82d JA |
249 | return 1; |
250 | } | |
251 | ||
2dc1bbeb JA |
252 | ld->aio_events = malloc(td->o.iodepth * sizeof(struct io_event)); |
253 | memset(ld->aio_events, 0, td->o.iodepth * sizeof(struct io_event)); | |
254 | ld->iocbs = malloc(td->o.iodepth * sizeof(struct iocb *)); | |
755200a3 | 255 | memset(ld->iocbs, 0, sizeof(struct iocb *)); |
2dc1bbeb JA |
256 | ld->io_us = malloc(td->o.iodepth * sizeof(struct io_u *)); |
257 | memset(ld->io_us, 0, td->o.iodepth * sizeof(struct io_u *)); | |
755200a3 JA |
258 | ld->iocbs_nr = 0; |
259 | ||
2866c82d JA |
260 | td->io_ops->data = ld; |
261 | return 0; | |
262 | } | |
263 | ||
5f350952 | 264 | static struct ioengine_ops ioengine = { |
2866c82d JA |
265 | .name = "libaio", |
266 | .version = FIO_IOOPS_VERSION, | |
267 | .init = fio_libaio_init, | |
268 | .prep = fio_libaio_prep, | |
269 | .queue = fio_libaio_queue, | |
755200a3 | 270 | .commit = fio_libaio_commit, |
2866c82d JA |
271 | .cancel = fio_libaio_cancel, |
272 | .getevents = fio_libaio_getevents, | |
273 | .event = fio_libaio_event, | |
274 | .cleanup = fio_libaio_cleanup, | |
b5af8293 JA |
275 | .open_file = generic_open_file, |
276 | .close_file = generic_close_file, | |
df9c26b1 | 277 | .get_file_size = generic_get_file_size, |
2866c82d | 278 | }; |
34cfcdaf JA |
279 | |
280 | #else /* FIO_HAVE_LIBAIO */ | |
281 | ||
282 | /* | |
283 | * When we have a proper configure system in place, we simply wont build | |
284 | * and install this io engine. For now install a crippled version that | |
285 | * just complains and fails to load. | |
286 | */ | |
287 | static int fio_libaio_init(struct thread_data fio_unused *td) | |
288 | { | |
a3edaf76 | 289 | log_err("fio: libaio not available\n"); |
34cfcdaf JA |
290 | return 1; |
291 | } | |
292 | ||
5f350952 | 293 | static struct ioengine_ops ioengine = { |
34cfcdaf JA |
294 | .name = "libaio", |
295 | .version = FIO_IOOPS_VERSION, | |
296 | .init = fio_libaio_init, | |
297 | }; | |
298 | ||
299 | #endif | |
5f350952 JA |
300 | |
301 | static void fio_init fio_libaio_register(void) | |
302 | { | |
303 | register_ioengine(&ioengine); | |
304 | } | |
305 | ||
306 | static void fio_exit fio_libaio_unregister(void) | |
307 | { | |
308 | unregister_ioengine(&ioengine); | |
309 | } |