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 | ||
36 | if (!ops->event) { | |
37 | log_err("%s: no event handler)\n", ops->name); | |
38 | return 1; | |
39 | } | |
40 | if (!ops->getevents) { | |
41 | log_err("%s: no getevents handler)\n", ops->name); | |
42 | return 1; | |
43 | } | |
44 | if (!ops->queue) { | |
45 | log_err("%s: no queue handler)\n", ops->name); | |
46 | return 1; | |
47 | } | |
48 | ||
49 | return 0; | |
50 | } | |
51 | ||
5f350952 | 52 | void unregister_ioengine(struct ioengine_ops *ops) |
ebac4655 | 53 | { |
5f350952 JA |
54 | list_del(&ops->list); |
55 | INIT_LIST_HEAD(&ops->list); | |
56 | } | |
57 | ||
58 | int register_ioengine(struct ioengine_ops *ops) | |
59 | { | |
60 | if (check_engine_ops(ops)) | |
61 | return 1; | |
62 | ||
63 | INIT_LIST_HEAD(&ops->list); | |
64 | list_add_tail(&ops->list, &engine_list); | |
65 | return 0; | |
66 | } | |
67 | ||
68 | static struct ioengine_ops *find_ioengine(const char *name) | |
69 | { | |
70 | struct ioengine_ops *ops; | |
71 | struct list_head *entry; | |
72 | char engine[16]; | |
ebac4655 | 73 | |
0bbab0e7 | 74 | strncpy(engine, name, sizeof(engine) - 1); |
ebac4655 | 75 | |
2866c82d JA |
76 | if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3)) |
77 | strcpy(engine, "libaio"); | |
ebac4655 | 78 | |
5f350952 JA |
79 | list_for_each(entry, &engine_list) { |
80 | ops = list_entry(entry, struct ioengine_ops, list); | |
81 | if (!strcmp(engine, ops->name)) | |
82 | return ops; | |
83 | } | |
84 | ||
85 | return NULL; | |
86 | } | |
87 | ||
88 | static struct ioengine_ops *dlopen_ioengine(struct thread_data *td, | |
89 | const char *engine_lib) | |
90 | { | |
91 | struct ioengine_ops *ops; | |
92 | void *dlhandle; | |
93 | ||
2866c82d JA |
94 | dlerror(); |
95 | dlhandle = dlopen(engine_lib, RTLD_LAZY); | |
d4dbaaa8 JA |
96 | if (!dlhandle) { |
97 | td_vmsg(td, -1, dlerror()); | |
98 | return NULL; | |
99 | } | |
8756e4d4 | 100 | |
da51c050 JA |
101 | /* |
102 | * Unlike the included modules, external engines should have a | |
103 | * non-static ioengine structure that we can reference. | |
104 | */ | |
2866c82d | 105 | ops = dlsym(dlhandle, "ioengine"); |
d4dbaaa8 JA |
106 | if (!ops) { |
107 | td_vmsg(td, -1, dlerror()); | |
108 | dlclose(dlhandle); | |
109 | return NULL; | |
110 | } | |
8756e4d4 | 111 | |
5f350952 JA |
112 | ops->dlhandle = dlhandle; |
113 | return ops; | |
114 | } | |
115 | ||
116 | struct ioengine_ops *load_ioengine(struct thread_data *td, const char *name) | |
117 | { | |
118 | struct ioengine_ops *ops, *ret; | |
119 | char engine[16]; | |
120 | ||
121 | strncpy(engine, name, sizeof(engine) - 1); | |
122 | ||
123 | /* | |
124 | * linux libaio has alias names, so convert to what we want | |
125 | */ | |
126 | if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3)) | |
127 | strcpy(engine, "libaio"); | |
128 | ||
129 | ops = find_ioengine(engine); | |
130 | if (!ops) | |
131 | ops = dlopen_ioengine(td, name); | |
132 | ||
133 | if (!ops) { | |
134 | log_err("fio: engine %s not loadable\n", name); | |
b902ceb5 JA |
135 | return NULL; |
136 | } | |
137 | ||
8c16d840 JA |
138 | /* |
139 | * Check that the required methods are there. | |
140 | */ | |
5f350952 | 141 | if (check_engine_ops(ops)) |
8c16d840 | 142 | return NULL; |
8c16d840 | 143 | |
84585003 JA |
144 | ret = malloc(sizeof(*ret)); |
145 | memcpy(ret, ops, sizeof(*ret)); | |
146 | ret->data = NULL; | |
84585003 JA |
147 | |
148 | return ret; | |
8756e4d4 JA |
149 | } |
150 | ||
2866c82d | 151 | void close_ioengine(struct thread_data *td) |
8756e4d4 | 152 | { |
2866c82d JA |
153 | if (td->io_ops->cleanup) |
154 | td->io_ops->cleanup(td); | |
b990b5c0 | 155 | |
5f350952 JA |
156 | if (td->io_ops->dlhandle) |
157 | dlclose(td->io_ops->dlhandle); | |
158 | ||
84585003 JA |
159 | free(td->io_ops); |
160 | td->io_ops = NULL; | |
b990b5c0 | 161 | } |
10ba535a JA |
162 | |
163 | int td_io_prep(struct thread_data *td, struct io_u *io_u) | |
164 | { | |
165 | if (td->io_ops->prep && td->io_ops->prep(td, io_u)) | |
166 | return 1; | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
10ba535a JA |
171 | int td_io_getevents(struct thread_data *td, int min, int max, |
172 | struct timespec *t) | |
173 | { | |
174 | return td->io_ops->getevents(td, min, max, t); | |
175 | } | |
176 | ||
177 | int td_io_queue(struct thread_data *td, struct io_u *io_u) | |
178 | { | |
02bcaa8c | 179 | fio_gettime(&io_u->issue_time, NULL); |
10ba535a JA |
180 | |
181 | return td->io_ops->queue(td, io_u); | |
182 | } | |
8c16d840 JA |
183 | |
184 | int td_io_init(struct thread_data *td) | |
185 | { | |
186 | if (td->io_ops->init) | |
187 | return td->io_ops->init(td); | |
188 | ||
189 | return 0; | |
190 | } |