Commit | Line | Data |
---|---|---|
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 | ||
8c16d840 JA |
21 | static int check_engine_ops(struct ioengine_ops *ops) |
22 | { | |
23 | /* | |
24 | * cpu thread doesn't need to provide anything | |
25 | */ | |
26 | if (ops->flags & FIO_CPUIO) | |
27 | return 0; | |
28 | ||
29 | if (!ops->event) { | |
30 | log_err("%s: no event handler)\n", ops->name); | |
31 | return 1; | |
32 | } | |
33 | if (!ops->getevents) { | |
34 | log_err("%s: no getevents handler)\n", ops->name); | |
35 | return 1; | |
36 | } | |
37 | if (!ops->queue) { | |
38 | log_err("%s: no queue handler)\n", ops->name); | |
39 | return 1; | |
40 | } | |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
2866c82d | 45 | struct ioengine_ops *load_ioengine(struct thread_data *td, char *name) |
ebac4655 | 46 | { |
2866c82d | 47 | char engine[16], engine_lib[256]; |
84585003 | 48 | struct ioengine_ops *ops, *ret; |
2866c82d | 49 | void *dlhandle; |
ebac4655 | 50 | |
2866c82d | 51 | strcpy(engine, name); |
ebac4655 JA |
52 | |
53 | /* | |
2866c82d | 54 | * linux libaio has alias names, so convert to what we want |
ebac4655 | 55 | */ |
2866c82d JA |
56 | if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3)) |
57 | strcpy(engine, "libaio"); | |
ebac4655 | 58 | |
c1d5725e | 59 | sprintf(engine_lib, "%s/lib/fio/fio-engine-%s.o", fio_inst_prefix, engine); |
2866c82d JA |
60 | dlerror(); |
61 | dlhandle = dlopen(engine_lib, RTLD_LAZY); | |
d4dbaaa8 JA |
62 | if (!dlhandle) { |
63 | td_vmsg(td, -1, dlerror()); | |
64 | return NULL; | |
65 | } | |
8756e4d4 | 66 | |
2866c82d | 67 | ops = dlsym(dlhandle, "ioengine"); |
d4dbaaa8 JA |
68 | if (!ops) { |
69 | td_vmsg(td, -1, dlerror()); | |
70 | dlclose(dlhandle); | |
71 | return NULL; | |
72 | } | |
8756e4d4 | 73 | |
b902ceb5 JA |
74 | if (ops->version != FIO_IOOPS_VERSION) { |
75 | log_err("bad ioops version %d (want %d)\n", ops->version, FIO_IOOPS_VERSION); | |
76 | dlclose(dlhandle); | |
77 | return NULL; | |
78 | } | |
79 | ||
8c16d840 JA |
80 | /* |
81 | * Check that the required methods are there. | |
82 | */ | |
83 | if (check_engine_ops(ops)) { | |
84 | dlclose(dlhandle); | |
85 | return NULL; | |
86 | } | |
87 | ||
84585003 JA |
88 | ret = malloc(sizeof(*ret)); |
89 | memcpy(ret, ops, sizeof(*ret)); | |
90 | ret->data = NULL; | |
91 | ret->dlhandle = dlhandle; | |
92 | ||
93 | return ret; | |
8756e4d4 JA |
94 | } |
95 | ||
2866c82d | 96 | void close_ioengine(struct thread_data *td) |
8756e4d4 | 97 | { |
2866c82d JA |
98 | if (td->io_ops->cleanup) |
99 | td->io_ops->cleanup(td); | |
b990b5c0 | 100 | |
2866c82d | 101 | dlclose(td->io_ops->dlhandle); |
84585003 JA |
102 | free(td->io_ops); |
103 | td->io_ops = NULL; | |
b990b5c0 | 104 | } |
10ba535a JA |
105 | |
106 | int td_io_prep(struct thread_data *td, struct io_u *io_u) | |
107 | { | |
108 | if (td->io_ops->prep && td->io_ops->prep(td, io_u)) | |
109 | return 1; | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
10ba535a JA |
114 | int td_io_getevents(struct thread_data *td, int min, int max, |
115 | struct timespec *t) | |
116 | { | |
117 | return td->io_ops->getevents(td, min, max, t); | |
118 | } | |
119 | ||
120 | int td_io_queue(struct thread_data *td, struct io_u *io_u) | |
121 | { | |
122 | gettimeofday(&io_u->issue_time, NULL); | |
123 | ||
124 | return td->io_ops->queue(td, io_u); | |
125 | } | |
8c16d840 JA |
126 | |
127 | int td_io_init(struct thread_data *td) | |
128 | { | |
129 | if (td->io_ops->init) | |
130 | return td->io_ops->init(td); | |
131 | ||
132 | return 0; | |
133 | } |