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; | |
8d714a60 | 21 | struct io_u *sync_io_u; |
2866c82d JA |
22 | }; |
23 | ||
7a16dd02 | 24 | static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u) |
2866c82d | 25 | { |
53cdc686 JA |
26 | struct fio_file *f = io_u->file; |
27 | ||
2866c82d | 28 | if (io_u->ddir == DDIR_READ) |
cec6b55d | 29 | io_prep_pread(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); |
87dc1ab1 | 30 | else if (io_u->ddir == DDIR_WRITE) |
cec6b55d | 31 | io_prep_pwrite(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); |
87dc1ab1 JA |
32 | else if (io_u->ddir == DDIR_SYNC) |
33 | io_prep_fsync(&io_u->iocb, f->fd); | |
34 | else | |
35 | return 1; | |
2866c82d JA |
36 | |
37 | return 0; | |
38 | } | |
39 | ||
40 | static struct io_u *fio_libaio_event(struct thread_data *td, int event) | |
41 | { | |
42 | struct libaio_data *ld = td->io_ops->data; | |
43 | ||
8d714a60 JA |
44 | if (ld->sync_io_u) { |
45 | struct io_u *ret = ld->sync_io_u; | |
46 | ||
47 | ld->sync_io_u = NULL; | |
48 | return ret; | |
49 | } | |
50 | ||
2866c82d JA |
51 | return ev_to_iou(ld->aio_events + event); |
52 | } | |
53 | ||
54 | static int fio_libaio_getevents(struct thread_data *td, int min, int max, | |
55 | struct timespec *t) | |
56 | { | |
57 | struct libaio_data *ld = td->io_ops->data; | |
58 | long r; | |
59 | ||
8d714a60 JA |
60 | if (ld->sync_io_u) |
61 | return 1; | |
62 | ||
2866c82d JA |
63 | do { |
64 | r = io_getevents(ld->aio_ctx, min, max, ld->aio_events, t); | |
ccbb91cb JA |
65 | if (r >= min) |
66 | break; | |
67 | else if (r == -EAGAIN) { | |
2866c82d JA |
68 | usleep(100); |
69 | continue; | |
70 | } else if (r == -EINTR) | |
71 | continue; | |
84585003 | 72 | else if (r != 0) |
2866c82d JA |
73 | break; |
74 | } while (1); | |
75 | ||
eaf09db4 JA |
76 | if (r < 0) |
77 | r = -r; | |
78 | ||
79 | return (int) r; | |
2866c82d JA |
80 | } |
81 | ||
82 | static int fio_libaio_queue(struct thread_data *td, struct io_u *io_u) | |
83 | { | |
84 | struct libaio_data *ld = td->io_ops->data; | |
85 | struct iocb *iocb = &io_u->iocb; | |
86 | long ret; | |
87 | ||
88 | do { | |
89 | ret = io_submit(ld->aio_ctx, 1, &iocb); | |
90 | if (ret == 1) | |
91 | return 0; | |
84585003 | 92 | else if (ret == -EAGAIN || !ret) |
2866c82d JA |
93 | usleep(100); |
94 | else if (ret == -EINTR) | |
95 | continue; | |
e5c40aab JA |
96 | else if (ret == -EINVAL && io_u->ddir == DDIR_SYNC) { |
97 | /* | |
98 | * the async fsync doesn't currently seem to be | |
99 | * supported, so just fsync if we fail with EINVAL | |
100 | * for a sync. since buffered io is also sync | |
101 | * with libaio (still), we don't have pending | |
102 | * requests to flush first. | |
103 | */ | |
104 | ret = fsync(io_u->file->fd); | |
8d714a60 | 105 | ld->sync_io_u = io_u; |
e5c40aab JA |
106 | break; |
107 | } else | |
2866c82d JA |
108 | break; |
109 | } while (1); | |
110 | ||
353a7e0e | 111 | if (ret <= 0) { |
cec6b55d | 112 | io_u->resid = io_u->xfer_buflen; |
353a7e0e JA |
113 | io_u->error = -ret; |
114 | return 1; | |
115 | } | |
2866c82d | 116 | |
353a7e0e | 117 | return 0; |
2866c82d JA |
118 | } |
119 | ||
120 | static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u) | |
121 | { | |
122 | struct libaio_data *ld = td->io_ops->data; | |
123 | ||
124 | return io_cancel(ld->aio_ctx, &io_u->iocb, ld->aio_events); | |
125 | } | |
126 | ||
127 | static void fio_libaio_cleanup(struct thread_data *td) | |
128 | { | |
129 | struct libaio_data *ld = td->io_ops->data; | |
130 | ||
131 | if (ld) { | |
132 | io_destroy(ld->aio_ctx); | |
133 | if (ld->aio_events) | |
134 | free(ld->aio_events); | |
135 | ||
136 | free(ld); | |
137 | td->io_ops->data = NULL; | |
138 | } | |
139 | } | |
140 | ||
141 | static int fio_libaio_init(struct thread_data *td) | |
142 | { | |
143 | struct libaio_data *ld = malloc(sizeof(*ld)); | |
144 | ||
145 | memset(ld, 0, sizeof(*ld)); | |
146 | if (io_queue_init(td->iodepth, &ld->aio_ctx)) { | |
147 | td_verror(td, errno); | |
cb781c75 | 148 | free(ld); |
2866c82d JA |
149 | return 1; |
150 | } | |
151 | ||
152 | ld->aio_events = malloc(td->iodepth * sizeof(struct io_event)); | |
84585003 | 153 | memset(ld->aio_events, 0, td->iodepth * sizeof(struct io_event)); |
2866c82d JA |
154 | td->io_ops->data = ld; |
155 | return 0; | |
156 | } | |
157 | ||
5f350952 | 158 | static struct ioengine_ops ioengine = { |
2866c82d JA |
159 | .name = "libaio", |
160 | .version = FIO_IOOPS_VERSION, | |
161 | .init = fio_libaio_init, | |
162 | .prep = fio_libaio_prep, | |
163 | .queue = fio_libaio_queue, | |
164 | .cancel = fio_libaio_cancel, | |
165 | .getevents = fio_libaio_getevents, | |
166 | .event = fio_libaio_event, | |
167 | .cleanup = fio_libaio_cleanup, | |
2866c82d | 168 | }; |
34cfcdaf JA |
169 | |
170 | #else /* FIO_HAVE_LIBAIO */ | |
171 | ||
172 | /* | |
173 | * When we have a proper configure system in place, we simply wont build | |
174 | * and install this io engine. For now install a crippled version that | |
175 | * just complains and fails to load. | |
176 | */ | |
177 | static int fio_libaio_init(struct thread_data fio_unused *td) | |
178 | { | |
179 | fprintf(stderr, "fio: libaio not available\n"); | |
180 | return 1; | |
181 | } | |
182 | ||
5f350952 | 183 | static struct ioengine_ops ioengine = { |
34cfcdaf JA |
184 | .name = "libaio", |
185 | .version = FIO_IOOPS_VERSION, | |
186 | .init = fio_libaio_init, | |
187 | }; | |
188 | ||
189 | #endif | |
5f350952 JA |
190 | |
191 | static void fio_init fio_libaio_register(void) | |
192 | { | |
193 | register_ioengine(&ioengine); | |
194 | } | |
195 | ||
196 | static void fio_exit fio_libaio_unregister(void) | |
197 | { | |
198 | unregister_ioengine(&ioengine); | |
199 | } |