Jens Axboe | ebac465 | 2005-12-08 15:25:21 +0100 | [diff] [blame] | 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> |
Jens Axboe | 5c4e1db | 2006-06-07 14:17:08 +0200 | [diff] [blame] | 15 | #include <string.h> |
Jens Axboe | 2866c82 | 2006-10-09 15:57:48 +0200 | [diff] [blame] | 16 | #include <dlfcn.h> |
Jens Axboe | 8c16d84 | 2006-10-20 11:48:33 +0200 | [diff] [blame] | 17 | |
Jens Axboe | ebac465 | 2005-12-08 15:25:21 +0100 | [diff] [blame] | 18 | #include "fio.h" |
| 19 | #include "os.h" |
| 20 | |
Jens Axboe | 5f35095 | 2006-11-07 15:20:59 +0100 | [diff] [blame] | 21 | static LIST_HEAD(engine_list); |
| 22 | |
Jens Axboe | 8c16d84 | 2006-10-20 11:48:33 +0200 | [diff] [blame] | 23 | static int check_engine_ops(struct ioengine_ops *ops) |
| 24 | { |
Jens Axboe | 5f35095 | 2006-11-07 15:20:59 +0100 | [diff] [blame] | 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 | |
Jens Axboe | 8c16d84 | 2006-10-20 11:48:33 +0200 | [diff] [blame] | 30 | /* |
| 31 | * cpu thread doesn't need to provide anything |
| 32 | */ |
| 33 | if (ops->flags & FIO_CPUIO) |
| 34 | return 0; |
| 35 | |
Jens Axboe | 36167d8 | 2007-02-18 05:41:31 +0100 | [diff] [blame] | 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 | |
Jens Axboe | 8c16d84 | 2006-10-20 11:48:33 +0200 | [diff] [blame] | 47 | if (!ops->event) { |
Jens Axboe | 36167d8 | 2007-02-18 05:41:31 +0100 | [diff] [blame] | 48 | log_err("%s: no event handler\n", ops->name); |
Jens Axboe | 8c16d84 | 2006-10-20 11:48:33 +0200 | [diff] [blame] | 49 | return 1; |
| 50 | } |
| 51 | if (!ops->getevents) { |
Jens Axboe | 36167d8 | 2007-02-18 05:41:31 +0100 | [diff] [blame] | 52 | log_err("%s: no getevents handler\n", ops->name); |
Jens Axboe | 8c16d84 | 2006-10-20 11:48:33 +0200 | [diff] [blame] | 53 | return 1; |
| 54 | } |
| 55 | if (!ops->queue) { |
Jens Axboe | 36167d8 | 2007-02-18 05:41:31 +0100 | [diff] [blame] | 56 | log_err("%s: no queue handler\n", ops->name); |
Jens Axboe | 8c16d84 | 2006-10-20 11:48:33 +0200 | [diff] [blame] | 57 | return 1; |
| 58 | } |
| 59 | |
| 60 | return 0; |
| 61 | } |
| 62 | |
Jens Axboe | 5f35095 | 2006-11-07 15:20:59 +0100 | [diff] [blame] | 63 | void unregister_ioengine(struct ioengine_ops *ops) |
Jens Axboe | ebac465 | 2005-12-08 15:25:21 +0100 | [diff] [blame] | 64 | { |
Jens Axboe | 5f35095 | 2006-11-07 15:20:59 +0100 | [diff] [blame] | 65 | list_del(&ops->list); |
| 66 | INIT_LIST_HEAD(&ops->list); |
| 67 | } |
| 68 | |
| 69 | int register_ioengine(struct ioengine_ops *ops) |
| 70 | { |
Jens Axboe | 5f35095 | 2006-11-07 15:20:59 +0100 | [diff] [blame] | 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]; |
Jens Axboe | ebac465 | 2005-12-08 15:25:21 +0100 | [diff] [blame] | 81 | |
Jens Axboe | 0bbab0e | 2006-11-02 09:18:36 +0100 | [diff] [blame] | 82 | strncpy(engine, name, sizeof(engine) - 1); |
Jens Axboe | ebac465 | 2005-12-08 15:25:21 +0100 | [diff] [blame] | 83 | |
Jens Axboe | 2866c82 | 2006-10-09 15:57:48 +0200 | [diff] [blame] | 84 | if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3)) |
| 85 | strcpy(engine, "libaio"); |
| 86 | |
Jens Axboe | 5f35095 | 2006-11-07 15:20:59 +0100 | [diff] [blame] | 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 | |
Jens Axboe | 2866c82 | 2006-10-09 15:57:48 +0200 | [diff] [blame] | 102 | dlerror(); |
| 103 | dlhandle = dlopen(engine_lib, RTLD_LAZY); |
Jens Axboe | d4dbaaa | 2006-10-09 16:01:27 +0200 | [diff] [blame] | 104 | if (!dlhandle) { |
| 105 | td_vmsg(td, -1, dlerror()); |
| 106 | return NULL; |
| 107 | } |
Jens Axboe | 2866c82 | 2006-10-09 15:57:48 +0200 | [diff] [blame] | 108 | |
Jens Axboe | da51c05 | 2006-11-07 16:02:11 +0100 | [diff] [blame] | 109 | /* |
| 110 | * Unlike the included modules, external engines should have a |
| 111 | * non-static ioengine structure that we can reference. |
| 112 | */ |
Jens Axboe | 2866c82 | 2006-10-09 15:57:48 +0200 | [diff] [blame] | 113 | ops = dlsym(dlhandle, "ioengine"); |
Jens Axboe | d4dbaaa | 2006-10-09 16:01:27 +0200 | [diff] [blame] | 114 | if (!ops) { |
| 115 | td_vmsg(td, -1, dlerror()); |
| 116 | dlclose(dlhandle); |
| 117 | return NULL; |
| 118 | } |
Jens Axboe | 2866c82 | 2006-10-09 15:57:48 +0200 | [diff] [blame] | 119 | |
Jens Axboe | 5f35095 | 2006-11-07 15:20:59 +0100 | [diff] [blame] | 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); |
Jens Axboe | b902ceb | 2006-10-09 16:11:45 +0200 | [diff] [blame] | 143 | return NULL; |
| 144 | } |
| 145 | |
Jens Axboe | 8c16d84 | 2006-10-20 11:48:33 +0200 | [diff] [blame] | 146 | /* |
| 147 | * Check that the required methods are there. |
| 148 | */ |
Jens Axboe | 5f35095 | 2006-11-07 15:20:59 +0100 | [diff] [blame] | 149 | if (check_engine_ops(ops)) |
Jens Axboe | 8c16d84 | 2006-10-20 11:48:33 +0200 | [diff] [blame] | 150 | return NULL; |
Jens Axboe | 8c16d84 | 2006-10-20 11:48:33 +0200 | [diff] [blame] | 151 | |
Jens Axboe | 8458500 | 2006-10-19 20:26:22 +0200 | [diff] [blame] | 152 | ret = malloc(sizeof(*ret)); |
| 153 | memcpy(ret, ops, sizeof(*ret)); |
| 154 | ret->data = NULL; |
Jens Axboe | 8458500 | 2006-10-19 20:26:22 +0200 | [diff] [blame] | 155 | |
| 156 | return ret; |
Jens Axboe | ebac465 | 2005-12-08 15:25:21 +0100 | [diff] [blame] | 157 | } |
| 158 | |
Jens Axboe | 2866c82 | 2006-10-09 15:57:48 +0200 | [diff] [blame] | 159 | void close_ioengine(struct thread_data *td) |
Jens Axboe | ebac465 | 2005-12-08 15:25:21 +0100 | [diff] [blame] | 160 | { |
Jens Axboe | 2866c82 | 2006-10-09 15:57:48 +0200 | [diff] [blame] | 161 | if (td->io_ops->cleanup) |
| 162 | td->io_ops->cleanup(td); |
Jens Axboe | ebac465 | 2005-12-08 15:25:21 +0100 | [diff] [blame] | 163 | |
Jens Axboe | 5f35095 | 2006-11-07 15:20:59 +0100 | [diff] [blame] | 164 | if (td->io_ops->dlhandle) |
| 165 | dlclose(td->io_ops->dlhandle); |
| 166 | |
Jens Axboe | 8458500 | 2006-10-19 20:26:22 +0200 | [diff] [blame] | 167 | free(td->io_ops); |
| 168 | td->io_ops = NULL; |
Jens Axboe | b990b5c | 2006-09-14 09:48:22 +0200 | [diff] [blame] | 169 | } |
Jens Axboe | 10ba535 | 2006-10-20 11:39:27 +0200 | [diff] [blame] | 170 | |
| 171 | int td_io_prep(struct thread_data *td, struct io_u *io_u) |
| 172 | { |
Jens Axboe | 36167d8 | 2007-02-18 05:41:31 +0100 | [diff] [blame] | 173 | if (td->io_ops->prep) |
| 174 | return td->io_ops->prep(td, io_u); |
Jens Axboe | 10ba535 | 2006-10-20 11:39:27 +0200 | [diff] [blame] | 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
Jens Axboe | 10ba535 | 2006-10-20 11:39:27 +0200 | [diff] [blame] | 179 | int td_io_getevents(struct thread_data *td, int min, int max, |
| 180 | struct timespec *t) |
| 181 | { |
Jens Axboe | 36167d8 | 2007-02-18 05:41:31 +0100 | [diff] [blame] | 182 | if (td->io_ops->getevents) |
| 183 | return td->io_ops->getevents(td, min, max, t); |
| 184 | |
| 185 | return 0; |
Jens Axboe | 10ba535 | 2006-10-20 11:39:27 +0200 | [diff] [blame] | 186 | } |
| 187 | |
| 188 | int td_io_queue(struct thread_data *td, struct io_u *io_u) |
| 189 | { |
Jens Axboe | 02bcaa8 | 2006-11-24 10:42:00 +0100 | [diff] [blame] | 190 | fio_gettime(&io_u->issue_time, NULL); |
Jens Axboe | 10ba535 | 2006-10-20 11:39:27 +0200 | [diff] [blame] | 191 | |
| 192 | return td->io_ops->queue(td, io_u); |
| 193 | } |
Jens Axboe | 8c16d84 | 2006-10-20 11:48:33 +0200 | [diff] [blame] | 194 | |
| 195 | int td_io_init(struct thread_data *td) |
| 196 | { |
| 197 | if (td->io_ops->init) |
| 198 | return td->io_ops->init(td); |
| 199 | |
| 200 | return 0; |
| 201 | } |