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