Commit | Line | Data |
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2866c82d JA |
1 | /* |
2 | * native linux aio io engine | |
3 | * | |
4 | */ | |
5 | #include <stdio.h> | |
6 | #include <stdlib.h> | |
7 | #include <unistd.h> | |
8 | #include <errno.h> | |
9 | #include <assert.h> | |
5f350952 JA |
10 | |
11 | #include "../fio.h" | |
12 | #include "../os.h" | |
2866c82d | 13 | |
34cfcdaf JA |
14 | #ifdef FIO_HAVE_LIBAIO |
15 | ||
2866c82d JA |
16 | #define ev_to_iou(ev) (struct io_u *) ((unsigned long) (ev)->obj) |
17 | ||
18 | struct libaio_data { | |
19 | io_context_t aio_ctx; | |
20 | struct io_event *aio_events; | |
755200a3 | 21 | struct iocb **iocbs; |
7e77dd02 | 22 | struct io_u **io_us; |
755200a3 | 23 | int iocbs_nr; |
2866c82d JA |
24 | }; |
25 | ||
7a16dd02 | 26 | static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u) |
2866c82d | 27 | { |
53cdc686 JA |
28 | struct fio_file *f = io_u->file; |
29 | ||
2866c82d | 30 | if (io_u->ddir == DDIR_READ) |
cec6b55d | 31 | io_prep_pread(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); |
87dc1ab1 | 32 | else if (io_u->ddir == DDIR_WRITE) |
cec6b55d | 33 | io_prep_pwrite(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); |
87dc1ab1 JA |
34 | else if (io_u->ddir == DDIR_SYNC) |
35 | io_prep_fsync(&io_u->iocb, f->fd); | |
36 | else | |
37 | return 1; | |
2866c82d JA |
38 | |
39 | return 0; | |
40 | } | |
41 | ||
42 | static struct io_u *fio_libaio_event(struct thread_data *td, int event) | |
43 | { | |
44 | struct libaio_data *ld = td->io_ops->data; | |
45 | ||
46 | return ev_to_iou(ld->aio_events + event); | |
47 | } | |
48 | ||
49 | static int fio_libaio_getevents(struct thread_data *td, int min, int max, | |
50 | struct timespec *t) | |
51 | { | |
52 | struct libaio_data *ld = td->io_ops->data; | |
53 | long r; | |
54 | ||
55 | do { | |
56 | r = io_getevents(ld->aio_ctx, min, max, ld->aio_events, t); | |
ccbb91cb JA |
57 | if (r >= min) |
58 | break; | |
59 | else if (r == -EAGAIN) { | |
2866c82d JA |
60 | usleep(100); |
61 | continue; | |
62 | } else if (r == -EINTR) | |
63 | continue; | |
84585003 | 64 | else if (r != 0) |
2866c82d JA |
65 | break; |
66 | } while (1); | |
67 | ||
22819ec2 | 68 | return r; |
2866c82d JA |
69 | } |
70 | ||
71 | static int fio_libaio_queue(struct thread_data *td, struct io_u *io_u) | |
72 | { | |
73 | struct libaio_data *ld = td->io_ops->data; | |
2866c82d | 74 | |
755200a3 JA |
75 | if (ld->iocbs_nr == (int) td->iodepth) |
76 | return FIO_Q_BUSY; | |
77 | ||
78 | /* | |
79 | * fsync is tricky, since it can fail and we need to do it | |
80 | * serialized with other io. the reason is that linux doesn't | |
81 | * support aio fsync yet. So return busy for the case where we | |
82 | * have pending io, to let fio complete those first. | |
83 | */ | |
84 | if (io_u->ddir == DDIR_SYNC) { | |
85 | if (ld->iocbs_nr) | |
86 | return FIO_Q_BUSY; | |
87 | if (fsync(io_u->file->fd) < 0) | |
88 | io_u->error = errno; | |
89 | ||
90 | return FIO_Q_COMPLETED; | |
91 | } | |
92 | ||
93 | ld->iocbs[ld->iocbs_nr] = &io_u->iocb; | |
7e77dd02 | 94 | ld->io_us[ld->iocbs_nr] = io_u; |
755200a3 JA |
95 | ld->iocbs_nr++; |
96 | return FIO_Q_QUEUED; | |
97 | } | |
98 | ||
7e77dd02 JA |
99 | static void fio_libaio_queued(struct thread_data *td, struct io_u **io_us, |
100 | unsigned int nr) | |
101 | { | |
102 | struct timeval now; | |
103 | unsigned int i; | |
104 | ||
105 | fio_gettime(&now, NULL); | |
106 | ||
107 | for (i = 0; i < nr; i++) { | |
108 | struct io_u *io_u = io_us[i]; | |
109 | ||
110 | memcpy(&io_u->issue_time, &now, sizeof(now)); | |
111 | io_u_queued(td, io_u); | |
112 | } | |
113 | } | |
114 | ||
755200a3 JA |
115 | static int fio_libaio_commit(struct thread_data *td) |
116 | { | |
117 | struct libaio_data *ld = td->io_ops->data; | |
118 | struct iocb **iocbs; | |
7e77dd02 | 119 | struct io_u **io_us; |
755200a3 JA |
120 | int ret, iocbs_nr; |
121 | ||
122 | if (!ld->iocbs_nr) | |
123 | return 0; | |
124 | ||
125 | iocbs_nr = ld->iocbs_nr; | |
7e77dd02 | 126 | io_us = ld->io_us; |
755200a3 | 127 | iocbs = ld->iocbs; |
2866c82d | 128 | do { |
755200a3 JA |
129 | ret = io_submit(ld->aio_ctx, iocbs_nr, iocbs); |
130 | if (ret == iocbs_nr) { | |
7e77dd02 | 131 | fio_libaio_queued(td, io_us, ret); |
755200a3 JA |
132 | ret = 0; |
133 | break; | |
134 | } else if (ret > 0) { | |
7e77dd02 JA |
135 | fio_libaio_queued(td, io_us, ret); |
136 | io_us += ret; | |
755200a3 JA |
137 | iocbs += ret; |
138 | iocbs_nr -= ret; | |
139 | continue; | |
140 | } else if (ret == -EAGAIN || !ret) | |
2866c82d JA |
141 | usleep(100); |
142 | else if (ret == -EINTR) | |
143 | continue; | |
755200a3 | 144 | else |
2866c82d JA |
145 | break; |
146 | } while (1); | |
147 | ||
755200a3 JA |
148 | if (!ret) |
149 | ld->iocbs_nr = 0; | |
2866c82d | 150 | |
36167d82 | 151 | return ret; |
2866c82d JA |
152 | } |
153 | ||
154 | static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u) | |
155 | { | |
156 | struct libaio_data *ld = td->io_ops->data; | |
157 | ||
158 | return io_cancel(ld->aio_ctx, &io_u->iocb, ld->aio_events); | |
159 | } | |
160 | ||
161 | static void fio_libaio_cleanup(struct thread_data *td) | |
162 | { | |
163 | struct libaio_data *ld = td->io_ops->data; | |
164 | ||
165 | if (ld) { | |
166 | io_destroy(ld->aio_ctx); | |
7e77dd02 JA |
167 | free(ld->aio_events); |
168 | free(ld->iocbs); | |
169 | free(ld->io_us); | |
2866c82d JA |
170 | free(ld); |
171 | td->io_ops->data = NULL; | |
172 | } | |
173 | } | |
174 | ||
175 | static int fio_libaio_init(struct thread_data *td) | |
176 | { | |
177 | struct libaio_data *ld = malloc(sizeof(*ld)); | |
178 | ||
179 | memset(ld, 0, sizeof(*ld)); | |
180 | if (io_queue_init(td->iodepth, &ld->aio_ctx)) { | |
e1161c32 | 181 | td_verror(td, errno, "io_queue_init"); |
cb781c75 | 182 | free(ld); |
2866c82d JA |
183 | return 1; |
184 | } | |
185 | ||
186 | ld->aio_events = malloc(td->iodepth * sizeof(struct io_event)); | |
84585003 | 187 | memset(ld->aio_events, 0, td->iodepth * sizeof(struct io_event)); |
755200a3 JA |
188 | ld->iocbs = malloc(td->iodepth * sizeof(struct iocb *)); |
189 | memset(ld->iocbs, 0, sizeof(struct iocb *)); | |
7e77dd02 JA |
190 | ld->io_us = malloc(td->iodepth * sizeof(struct io_u *)); |
191 | memset(ld->io_us, 0, td->iodepth * sizeof(struct io_u *)); | |
755200a3 JA |
192 | ld->iocbs_nr = 0; |
193 | ||
2866c82d JA |
194 | td->io_ops->data = ld; |
195 | return 0; | |
196 | } | |
197 | ||
5f350952 | 198 | static struct ioengine_ops ioengine = { |
2866c82d JA |
199 | .name = "libaio", |
200 | .version = FIO_IOOPS_VERSION, | |
201 | .init = fio_libaio_init, | |
202 | .prep = fio_libaio_prep, | |
203 | .queue = fio_libaio_queue, | |
755200a3 | 204 | .commit = fio_libaio_commit, |
2866c82d JA |
205 | .cancel = fio_libaio_cancel, |
206 | .getevents = fio_libaio_getevents, | |
207 | .event = fio_libaio_event, | |
208 | .cleanup = fio_libaio_cleanup, | |
2866c82d | 209 | }; |
34cfcdaf JA |
210 | |
211 | #else /* FIO_HAVE_LIBAIO */ | |
212 | ||
213 | /* | |
214 | * When we have a proper configure system in place, we simply wont build | |
215 | * and install this io engine. For now install a crippled version that | |
216 | * just complains and fails to load. | |
217 | */ | |
218 | static int fio_libaio_init(struct thread_data fio_unused *td) | |
219 | { | |
220 | fprintf(stderr, "fio: libaio not available\n"); | |
221 | return 1; | |
222 | } | |
223 | ||
5f350952 | 224 | static struct ioengine_ops ioengine = { |
34cfcdaf JA |
225 | .name = "libaio", |
226 | .version = FIO_IOOPS_VERSION, | |
227 | .init = fio_libaio_init, | |
228 | }; | |
229 | ||
230 | #endif | |
5f350952 JA |
231 | |
232 | static void fio_init fio_libaio_register(void) | |
233 | { | |
234 | register_ioengine(&ioengine); | |
235 | } | |
236 | ||
237 | static void fio_exit fio_libaio_unregister(void) | |
238 | { | |
239 | unregister_ioengine(&ioengine); | |
240 | } |