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> |
8c16d840 | 17 | |
ebac4655 JA |
18 | #include "fio.h" |
19 | #include "os.h" | |
20 | ||
5f350952 JA |
21 | static LIST_HEAD(engine_list); |
22 | ||
8c16d840 JA |
23 | static int check_engine_ops(struct ioengine_ops *ops) |
24 | { | |
5f350952 JA |
25 | if (ops->version != FIO_IOOPS_VERSION) { |
26 | log_err("bad ioops version %d (want %d)\n", ops->version, FIO_IOOPS_VERSION); | |
27 | return 1; | |
28 | } | |
29 | ||
8c16d840 JA |
30 | /* |
31 | * cpu thread doesn't need to provide anything | |
32 | */ | |
33 | if (ops->flags & FIO_CPUIO) | |
34 | return 0; | |
35 | ||
36167d82 JA |
36 | if (!ops->queue) { |
37 | log_err("%s: no queue handler\n", ops->name); | |
38 | return 1; | |
39 | } | |
40 | ||
41 | /* | |
42 | * sync engines only need a ->queue() | |
43 | */ | |
44 | if (ops->flags & FIO_SYNCIO) | |
45 | return 0; | |
46 | ||
8c16d840 | 47 | if (!ops->event) { |
36167d82 | 48 | log_err("%s: no event handler\n", ops->name); |
8c16d840 JA |
49 | return 1; |
50 | } | |
51 | if (!ops->getevents) { | |
36167d82 | 52 | log_err("%s: no getevents handler\n", ops->name); |
8c16d840 JA |
53 | return 1; |
54 | } | |
55 | if (!ops->queue) { | |
36167d82 | 56 | log_err("%s: no queue handler\n", ops->name); |
8c16d840 JA |
57 | return 1; |
58 | } | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
5f350952 | 63 | void unregister_ioengine(struct ioengine_ops *ops) |
ebac4655 | 64 | { |
5f350952 JA |
65 | list_del(&ops->list); |
66 | INIT_LIST_HEAD(&ops->list); | |
67 | } | |
68 | ||
69 | int register_ioengine(struct ioengine_ops *ops) | |
70 | { | |
5f350952 JA |
71 | INIT_LIST_HEAD(&ops->list); |
72 | list_add_tail(&ops->list, &engine_list); | |
73 | return 0; | |
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 JA |
104 | if (!dlhandle) { |
105 | td_vmsg(td, -1, dlerror()); | |
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 JA |
114 | if (!ops) { |
115 | td_vmsg(td, -1, dlerror()); | |
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 | ||
84585003 JA |
167 | free(td->io_ops); |
168 | td->io_ops = NULL; | |
b990b5c0 | 169 | } |
10ba535a JA |
170 | |
171 | int td_io_prep(struct thread_data *td, struct io_u *io_u) | |
172 | { | |
36167d82 JA |
173 | if (td->io_ops->prep) |
174 | return td->io_ops->prep(td, io_u); | |
10ba535a JA |
175 | |
176 | return 0; | |
177 | } | |
178 | ||
10ba535a JA |
179 | int td_io_getevents(struct thread_data *td, int min, int max, |
180 | struct timespec *t) | |
181 | { | |
36167d82 JA |
182 | if (td->io_ops->getevents) |
183 | return td->io_ops->getevents(td, min, max, t); | |
184 | ||
185 | return 0; | |
10ba535a JA |
186 | } |
187 | ||
188 | int td_io_queue(struct thread_data *td, struct io_u *io_u) | |
189 | { | |
7e77dd02 JA |
190 | int ret; |
191 | ||
5aeb77df JA |
192 | if (td->io_ops->flags & FIO_SYNCIO) |
193 | fio_gettime(&io_u->issue_time, NULL); | |
10ba535a | 194 | |
755200a3 JA |
195 | if (io_u->ddir != DDIR_SYNC) |
196 | td->io_issues[io_u->ddir]++; | |
197 | ||
7e77dd02 | 198 | ret = td->io_ops->queue(td, io_u); |
5aeb77df JA |
199 | |
200 | if ((td->io_ops->flags & FIO_SYNCIO) == 0) | |
201 | fio_gettime(&io_u->issue_time, NULL); | |
202 | ||
7e77dd02 | 203 | return ret; |
10ba535a | 204 | } |
8c16d840 JA |
205 | |
206 | int td_io_init(struct thread_data *td) | |
207 | { | |
208 | if (td->io_ops->init) | |
209 | return td->io_ops->init(td); | |
210 | ||
211 | return 0; | |
212 | } | |
755200a3 JA |
213 | |
214 | int td_io_commit(struct thread_data *td) | |
215 | { | |
216 | if (td->io_ops->commit) | |
217 | return td->io_ops->commit(td); | |
218 | ||
219 | return 0; | |
220 | } |