Commit | Line | Data |
---|---|---|
a601337a AF |
1 | /* |
2 | * libblkio engine | |
3 | * | |
4 | * IO engine using libblkio to access various block I/O interfaces: | |
5 | * https://gitlab.com/libblkio/libblkio | |
6 | */ | |
7 | ||
8 | #include <assert.h> | |
9 | #include <errno.h> | |
10 | #include <stdbool.h> | |
11 | #include <stddef.h> | |
12 | #include <stdint.h> | |
13 | #include <stdlib.h> | |
14 | #include <string.h> | |
15 | ||
16 | #include <blkio.h> | |
17 | ||
18 | #include "../fio.h" | |
19 | #include "../optgroup.h" | |
20 | #include "../options.h" | |
21 | #include "../parse.h" | |
22 | ||
23 | /* per-thread state */ | |
24 | struct fio_blkio_data { | |
25 | struct blkio *b; | |
26 | struct blkioq *q; | |
b1bd09b5 | 27 | int completion_fd; /* may be -1 if not FIO_BLKIO_WAIT_MODE_EVENTFD */ |
a601337a AF |
28 | |
29 | bool has_mem_region; /* whether mem_region is valid */ | |
ef9b6f2f | 30 | struct blkio_mem_region mem_region; /* only if allocated by libblkio */ |
a601337a | 31 | |
6dd4291c | 32 | struct iovec *iovecs; /* for vectored requests */ |
a601337a AF |
33 | struct blkio_completion *completions; |
34 | }; | |
35 | ||
b158577d AF |
36 | enum fio_blkio_wait_mode { |
37 | FIO_BLKIO_WAIT_MODE_BLOCK, | |
38 | FIO_BLKIO_WAIT_MODE_EVENTFD, | |
39 | FIO_BLKIO_WAIT_MODE_LOOP, | |
40 | }; | |
41 | ||
a601337a AF |
42 | struct fio_blkio_options { |
43 | void *pad; /* option fields must not have offset 0 */ | |
44 | ||
45 | char *driver; | |
46 | char *pre_connect_props; | |
47 | char *pre_start_props; | |
a870d6ff AF |
48 | |
49 | unsigned int hipri; | |
6dd4291c | 50 | unsigned int vectored; |
464981ff | 51 | unsigned int write_zeroes_on_trim; |
b158577d | 52 | enum fio_blkio_wait_mode wait_mode; |
b1bd09b5 | 53 | unsigned int force_enable_completion_eventfd; |
a601337a AF |
54 | }; |
55 | ||
56 | static struct fio_option options[] = { | |
57 | { | |
58 | .name = "libblkio_driver", | |
59 | .lname = "libblkio driver name", | |
60 | .type = FIO_OPT_STR_STORE, | |
61 | .off1 = offsetof(struct fio_blkio_options, driver), | |
62 | .help = "Name of the driver to be used by libblkio", | |
63 | .category = FIO_OPT_C_ENGINE, | |
64 | .group = FIO_OPT_G_LIBBLKIO, | |
65 | }, | |
66 | { | |
67 | .name = "libblkio_pre_connect_props", | |
68 | .lname = "Properties to be set before blkio_connect()", | |
69 | .type = FIO_OPT_STR_STORE, | |
70 | .off1 = offsetof(struct fio_blkio_options, pre_connect_props), | |
71 | .help = "", | |
72 | .category = FIO_OPT_C_ENGINE, | |
73 | .group = FIO_OPT_G_LIBBLKIO, | |
74 | }, | |
75 | { | |
76 | .name = "libblkio_pre_start_props", | |
77 | .lname = "Properties to be set before blkio_start()", | |
78 | .type = FIO_OPT_STR_STORE, | |
79 | .off1 = offsetof(struct fio_blkio_options, pre_start_props), | |
80 | .help = "", | |
81 | .category = FIO_OPT_C_ENGINE, | |
82 | .group = FIO_OPT_G_LIBBLKIO, | |
83 | }, | |
a870d6ff AF |
84 | { |
85 | .name = "hipri", | |
86 | .lname = "Use poll queues", | |
87 | .type = FIO_OPT_STR_SET, | |
88 | .off1 = offsetof(struct fio_blkio_options, hipri), | |
89 | .help = "Use poll queues", | |
90 | .category = FIO_OPT_C_ENGINE, | |
91 | .group = FIO_OPT_G_LIBBLKIO, | |
92 | }, | |
6dd4291c AF |
93 | { |
94 | .name = "libblkio_vectored", | |
95 | .lname = "Use blkioq_{readv,writev}()", | |
96 | .type = FIO_OPT_STR_SET, | |
97 | .off1 = offsetof(struct fio_blkio_options, vectored), | |
98 | .help = "Use blkioq_{readv,writev}() instead of blkioq_{read,write}()", | |
99 | .category = FIO_OPT_C_ENGINE, | |
100 | .group = FIO_OPT_G_LIBBLKIO, | |
101 | }, | |
464981ff AF |
102 | { |
103 | .name = "libblkio_write_zeroes_on_trim", | |
104 | .lname = "Use blkioq_write_zeroes() for TRIM", | |
105 | .type = FIO_OPT_STR_SET, | |
106 | .off1 = offsetof(struct fio_blkio_options, | |
107 | write_zeroes_on_trim), | |
108 | .help = "Use blkioq_write_zeroes() for TRIM instead of blkioq_discard()", | |
109 | .category = FIO_OPT_C_ENGINE, | |
110 | .group = FIO_OPT_G_LIBBLKIO, | |
111 | }, | |
b158577d AF |
112 | { |
113 | .name = "libblkio_wait_mode", | |
114 | .lname = "How to wait for completions", | |
115 | .type = FIO_OPT_STR, | |
116 | .off1 = offsetof(struct fio_blkio_options, wait_mode), | |
117 | .help = "How to wait for completions", | |
118 | .def = "block", | |
119 | .posval = { | |
120 | { .ival = "block", | |
121 | .oval = FIO_BLKIO_WAIT_MODE_BLOCK, | |
122 | .help = "Blocking blkioq_do_io()", | |
123 | }, | |
124 | { .ival = "eventfd", | |
125 | .oval = FIO_BLKIO_WAIT_MODE_EVENTFD, | |
126 | .help = "Blocking read() on the completion eventfd", | |
127 | }, | |
128 | { .ival = "loop", | |
129 | .oval = FIO_BLKIO_WAIT_MODE_LOOP, | |
130 | .help = "Busy loop with non-blocking blkioq_do_io()", | |
131 | }, | |
132 | }, | |
133 | .category = FIO_OPT_C_ENGINE, | |
134 | .group = FIO_OPT_G_LIBBLKIO, | |
135 | }, | |
b1bd09b5 AF |
136 | { |
137 | .name = "libblkio_force_enable_completion_eventfd", | |
138 | .lname = "Force enable the completion eventfd, even if unused", | |
139 | .type = FIO_OPT_STR_SET, | |
140 | .off1 = offsetof(struct fio_blkio_options, | |
141 | force_enable_completion_eventfd), | |
142 | .help = "This can impact performance", | |
143 | .category = FIO_OPT_C_ENGINE, | |
144 | .group = FIO_OPT_G_LIBBLKIO, | |
145 | }, | |
a601337a AF |
146 | { |
147 | .name = NULL, | |
148 | }, | |
149 | }; | |
150 | ||
151 | static int fio_blkio_set_props_from_str(struct blkio *b, const char *opt_name, | |
152 | const char *str) { | |
153 | int ret = 0; | |
154 | char *new_str, *name, *value; | |
155 | ||
156 | if (!str) | |
157 | return 0; | |
158 | ||
159 | /* iteration can mutate string, so copy it */ | |
160 | new_str = strdup(str); | |
161 | if (!new_str) { | |
162 | log_err("fio: strdup() failed\n"); | |
163 | return 1; | |
164 | } | |
165 | ||
166 | /* iterate over property name-value pairs */ | |
167 | while ((name = get_next_str(&new_str))) { | |
168 | /* split into property name and value */ | |
169 | value = strchr(name, '='); | |
170 | if (!value) { | |
171 | log_err("fio: missing '=' in option %s\n", opt_name); | |
172 | ret = 1; | |
173 | break; | |
174 | } | |
175 | ||
176 | *value = '\0'; | |
177 | ++value; | |
178 | ||
179 | /* strip whitespace from property name */ | |
180 | strip_blank_front(&name); | |
181 | strip_blank_end(name); | |
182 | ||
183 | if (name[0] == '\0') { | |
184 | log_err("fio: empty property name in option %s\n", | |
185 | opt_name); | |
186 | ret = 1; | |
187 | break; | |
188 | } | |
189 | ||
190 | /* strip whitespace from property value */ | |
191 | strip_blank_front(&value); | |
192 | strip_blank_end(value); | |
193 | ||
194 | /* set property */ | |
195 | if (blkio_set_str(b, name, value) != 0) { | |
196 | log_err("fio: error setting property '%s' to '%s': %s\n", | |
197 | name, value, blkio_get_error_msg()); | |
198 | ret = 1; | |
199 | break; | |
200 | } | |
201 | } | |
202 | ||
203 | free(new_str); | |
204 | return ret; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Log the failure of a libblkio function. | |
209 | * | |
210 | * `(void)func` is to ensure `func` exists and prevent typos | |
211 | */ | |
212 | #define fio_blkio_log_err(func) \ | |
213 | ({ \ | |
214 | (void)func; \ | |
215 | log_err("fio: %s() failed: %s\n", #func, \ | |
216 | blkio_get_error_msg()); \ | |
217 | }) | |
218 | ||
219 | static int fio_blkio_create_and_connect(struct thread_data *td, | |
220 | struct blkio **out_blkio) | |
221 | { | |
222 | const struct fio_blkio_options *options = td->eo; | |
223 | struct blkio *b; | |
224 | int ret; | |
225 | ||
226 | if (!options->driver) { | |
227 | log_err("fio: engine libblkio requires option libblkio_driver to be set\n"); | |
228 | return 1; | |
229 | } | |
230 | ||
231 | if (blkio_create(options->driver, &b) != 0) { | |
232 | fio_blkio_log_err(blkio_create); | |
233 | return 1; | |
234 | } | |
235 | ||
236 | /* don't fail if driver doesn't have a "direct" property */ | |
237 | ret = blkio_set_bool(b, "direct", td->o.odirect); | |
238 | if (ret != 0 && ret != -ENOENT) { | |
239 | fio_blkio_log_err(blkio_set_bool); | |
240 | goto err_blkio_destroy; | |
241 | } | |
242 | ||
243 | if (blkio_set_bool(b, "read-only", read_only) != 0) { | |
244 | fio_blkio_log_err(blkio_set_bool); | |
245 | goto err_blkio_destroy; | |
246 | } | |
247 | ||
248 | if (fio_blkio_set_props_from_str(b, "libblkio_pre_connect_props", | |
249 | options->pre_connect_props) != 0) | |
250 | goto err_blkio_destroy; | |
251 | ||
252 | if (blkio_connect(b) != 0) { | |
253 | fio_blkio_log_err(blkio_connect); | |
254 | goto err_blkio_destroy; | |
255 | } | |
256 | ||
257 | if (fio_blkio_set_props_from_str(b, "libblkio_pre_start_props", | |
258 | options->pre_start_props) != 0) | |
259 | goto err_blkio_destroy; | |
260 | ||
261 | *out_blkio = b; | |
262 | return 0; | |
263 | ||
264 | err_blkio_destroy: | |
265 | blkio_destroy(&b); | |
266 | return 1; | |
267 | } | |
268 | ||
269 | /* | |
270 | * This callback determines the device/file size, so it creates and connects a | |
271 | * blkio instance. But it is invoked from the main thread in the original fio | |
272 | * process, not from the processes in which jobs will actually run. It thus | |
273 | * subsequently destroys the blkio, which is recreated in the init() callback. | |
274 | */ | |
275 | static int fio_blkio_setup(struct thread_data *td) | |
276 | { | |
b158577d | 277 | const struct fio_blkio_options *options = td->eo; |
a601337a AF |
278 | struct blkio *b; |
279 | int ret = 0; | |
280 | uint64_t capacity; | |
281 | ||
282 | assert(td->files_index == 1); | |
283 | ||
b158577d AF |
284 | if (options->hipri && |
285 | options->wait_mode == FIO_BLKIO_WAIT_MODE_EVENTFD) { | |
286 | log_err("fio: option hipri is incompatible with option libblkio_wait_mode=eventfd\n"); | |
287 | return 1; | |
288 | } | |
289 | ||
b1bd09b5 AF |
290 | if (options->hipri && options->force_enable_completion_eventfd) { |
291 | log_err("fio: option hipri is incompatible with option libblkio_force_enable_completion_eventfd\n"); | |
292 | return 1; | |
293 | } | |
294 | ||
a601337a AF |
295 | if (fio_blkio_create_and_connect(td, &b) != 0) |
296 | return 1; | |
297 | ||
298 | if (blkio_get_uint64(b, "capacity", &capacity) != 0) { | |
299 | fio_blkio_log_err(blkio_get_uint64); | |
300 | ret = 1; | |
301 | goto out_blkio_destroy; | |
302 | } | |
303 | ||
304 | td->files[0]->real_file_size = capacity; | |
305 | fio_file_set_size_known(td->files[0]); | |
306 | ||
307 | out_blkio_destroy: | |
308 | blkio_destroy(&b); | |
309 | return ret; | |
310 | } | |
311 | ||
312 | static int fio_blkio_init(struct thread_data *td) | |
313 | { | |
a870d6ff | 314 | const struct fio_blkio_options *options = td->eo; |
a601337a | 315 | struct fio_blkio_data *data; |
b158577d | 316 | int flags; |
a601337a AF |
317 | |
318 | /* | |
319 | * Request enqueueing is fast, and it's not possible to know exactly | |
320 | * when a request is submitted, so never report submission latencies. | |
321 | */ | |
322 | td->o.disable_slat = 1; | |
323 | ||
324 | data = calloc(1, sizeof(*data)); | |
325 | if (!data) { | |
326 | log_err("fio: calloc() failed\n"); | |
327 | return 1; | |
328 | } | |
329 | ||
6dd4291c | 330 | data->iovecs = calloc(td->o.iodepth, sizeof(data->iovecs[0])); |
a601337a | 331 | data->completions = calloc(td->o.iodepth, sizeof(data->completions[0])); |
6dd4291c | 332 | if (!data->iovecs || !data->completions) { |
a601337a AF |
333 | log_err("fio: calloc() failed\n"); |
334 | goto err_free; | |
335 | } | |
336 | ||
337 | if (fio_blkio_create_and_connect(td, &data->b) != 0) | |
338 | goto err_free; | |
339 | ||
a870d6ff AF |
340 | if (blkio_set_int(data->b, "num-queues", options->hipri ? 0 : 1) != 0) { |
341 | fio_blkio_log_err(blkio_set_int); | |
342 | goto err_blkio_destroy; | |
343 | } | |
344 | ||
345 | if (blkio_set_int(data->b, "num-poll-queues", | |
346 | options->hipri ? 1 : 0) != 0) { | |
a601337a AF |
347 | fio_blkio_log_err(blkio_set_int); |
348 | goto err_blkio_destroy; | |
349 | } | |
350 | ||
351 | if (blkio_start(data->b) != 0) { | |
352 | fio_blkio_log_err(blkio_start); | |
353 | goto err_blkio_destroy; | |
354 | } | |
355 | ||
a870d6ff AF |
356 | if (options->hipri) |
357 | data->q = blkio_get_poll_queue(data->b, 0); | |
358 | else | |
359 | data->q = blkio_get_queue(data->b, 0); | |
a601337a | 360 | |
b1bd09b5 AF |
361 | if (options->wait_mode == FIO_BLKIO_WAIT_MODE_EVENTFD || |
362 | options->force_enable_completion_eventfd) { | |
b158577d AF |
363 | /* enable completion fd and make it blocking */ |
364 | blkioq_set_completion_fd_enabled(data->q, true); | |
365 | data->completion_fd = blkioq_get_completion_fd(data->q); | |
366 | ||
367 | flags = fcntl(data->completion_fd, F_GETFL); | |
368 | if (flags < 0) { | |
369 | log_err("fio: fcntl(F_GETFL) failed: %s\n", | |
370 | strerror(errno)); | |
371 | goto err_blkio_destroy; | |
372 | } | |
373 | ||
374 | if (fcntl(data->completion_fd, F_SETFL, | |
375 | flags & ~O_NONBLOCK) != 0) { | |
376 | log_err("fio: fcntl(F_SETFL) failed: %s\n", | |
377 | strerror(errno)); | |
378 | goto err_blkio_destroy; | |
379 | } | |
380 | } else { | |
381 | data->completion_fd = -1; | |
382 | } | |
383 | ||
a601337a AF |
384 | /* Set data last so cleanup() does nothing if init() fails. */ |
385 | td->io_ops_data = data; | |
386 | ||
387 | return 0; | |
388 | ||
389 | err_blkio_destroy: | |
390 | blkio_destroy(&data->b); | |
391 | err_free: | |
392 | free(data->completions); | |
6dd4291c | 393 | free(data->iovecs); |
a601337a AF |
394 | free(data); |
395 | return 1; | |
396 | } | |
397 | ||
ef9b6f2f AF |
398 | static int fio_blkio_post_init(struct thread_data *td) |
399 | { | |
400 | struct fio_blkio_data *data = td->io_ops_data; | |
401 | ||
402 | if (!data->has_mem_region) { | |
403 | /* | |
404 | * Memory was allocated by the fio core and not iomem_alloc(), | |
405 | * so we need to register it as a memory region here. | |
406 | * | |
407 | * `td->orig_buffer_size` is computed like `len` below, but then | |
408 | * fio can add some padding to it to make sure it is | |
409 | * sufficiently aligned to the page size and the mem_align | |
410 | * option. However, this can make it become unaligned to the | |
411 | * "mem-region-alignment" property in ways that the user can't | |
412 | * control, so we essentially recompute `td->orig_buffer_size` | |
413 | * here but without adding that padding. | |
414 | */ | |
415 | ||
416 | unsigned long long max_block_size; | |
417 | struct blkio_mem_region region; | |
418 | ||
419 | max_block_size = max(td->o.max_bs[DDIR_READ], | |
420 | max(td->o.max_bs[DDIR_WRITE], | |
421 | td->o.max_bs[DDIR_TRIM])); | |
422 | ||
423 | region = (struct blkio_mem_region) { | |
424 | .addr = td->orig_buffer, | |
425 | .len = (size_t)max_block_size * | |
426 | (size_t)td->o.iodepth, | |
427 | .fd = -1, | |
428 | }; | |
429 | ||
430 | if (blkio_map_mem_region(data->b, ®ion) != 0) { | |
431 | fio_blkio_log_err(blkio_map_mem_region); | |
432 | return 1; | |
433 | } | |
434 | } | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
a601337a AF |
439 | static void fio_blkio_cleanup(struct thread_data *td) |
440 | { | |
441 | struct fio_blkio_data *data = td->io_ops_data; | |
442 | ||
443 | if (data) { | |
444 | blkio_destroy(&data->b); | |
445 | free(data->completions); | |
6dd4291c | 446 | free(data->iovecs); |
a601337a AF |
447 | free(data); |
448 | } | |
449 | } | |
450 | ||
451 | #define align_up(x, y) ((((x) + (y) - 1) / (y)) * (y)) | |
452 | ||
453 | static int fio_blkio_iomem_alloc(struct thread_data *td, size_t size) | |
454 | { | |
455 | struct fio_blkio_data *data = td->io_ops_data; | |
456 | int ret; | |
457 | uint64_t mem_region_alignment; | |
458 | ||
459 | if (blkio_get_uint64(data->b, "mem-region-alignment", | |
460 | &mem_region_alignment) != 0) { | |
461 | fio_blkio_log_err(blkio_get_uint64); | |
462 | return 1; | |
463 | } | |
464 | ||
465 | /* round up size to satisfy mem-region-alignment */ | |
466 | size = align_up(size, (size_t)mem_region_alignment); | |
467 | ||
468 | if (blkio_alloc_mem_region(data->b, &data->mem_region, size) != 0) { | |
469 | fio_blkio_log_err(blkio_alloc_mem_region); | |
470 | ret = 1; | |
471 | goto out; | |
472 | } | |
473 | ||
474 | if (blkio_map_mem_region(data->b, &data->mem_region) != 0) { | |
475 | fio_blkio_log_err(blkio_map_mem_region); | |
476 | ret = 1; | |
477 | goto out_free; | |
478 | } | |
479 | ||
480 | td->orig_buffer = data->mem_region.addr; | |
481 | data->has_mem_region = true; | |
482 | ||
483 | ret = 0; | |
484 | goto out; | |
485 | ||
486 | out_free: | |
487 | blkio_free_mem_region(data->b, &data->mem_region); | |
488 | out: | |
489 | return ret; | |
490 | } | |
491 | ||
492 | static void fio_blkio_iomem_free(struct thread_data *td) | |
493 | { | |
494 | struct fio_blkio_data *data = td->io_ops_data; | |
495 | ||
496 | if (data && data->has_mem_region) { | |
497 | blkio_unmap_mem_region(data->b, &data->mem_region); | |
498 | blkio_free_mem_region(data->b, &data->mem_region); | |
499 | ||
500 | data->has_mem_region = false; | |
501 | } | |
502 | } | |
503 | ||
504 | static int fio_blkio_open_file(struct thread_data *td, struct fio_file *f) | |
505 | { | |
506 | return 0; | |
507 | } | |
508 | ||
509 | static enum fio_q_status fio_blkio_queue(struct thread_data *td, | |
510 | struct io_u *io_u) | |
511 | { | |
6dd4291c | 512 | const struct fio_blkio_options *options = td->eo; |
a601337a AF |
513 | struct fio_blkio_data *data = td->io_ops_data; |
514 | ||
515 | fio_ro_check(td, io_u); | |
516 | ||
517 | switch (io_u->ddir) { | |
518 | case DDIR_READ: | |
6dd4291c AF |
519 | if (options->vectored) { |
520 | struct iovec *iov = &data->iovecs[io_u->index]; | |
521 | iov->iov_base = io_u->xfer_buf; | |
522 | iov->iov_len = (size_t)io_u->xfer_buflen; | |
523 | ||
524 | blkioq_readv(data->q, io_u->offset, iov, 1, | |
525 | io_u, 0); | |
526 | } else { | |
527 | blkioq_read(data->q, io_u->offset, | |
528 | io_u->xfer_buf, | |
529 | (size_t)io_u->xfer_buflen, io_u, 0); | |
530 | } | |
a601337a AF |
531 | break; |
532 | case DDIR_WRITE: | |
6dd4291c AF |
533 | if (options->vectored) { |
534 | struct iovec *iov = &data->iovecs[io_u->index]; | |
535 | iov->iov_base = io_u->xfer_buf; | |
536 | iov->iov_len = (size_t)io_u->xfer_buflen; | |
537 | ||
538 | blkioq_writev(data->q, io_u->offset, iov, 1, | |
539 | io_u, 0); | |
540 | } else { | |
541 | blkioq_write(data->q, io_u->offset, | |
542 | io_u->xfer_buf, | |
543 | (size_t)io_u->xfer_buflen, io_u, | |
544 | 0); | |
545 | } | |
a601337a AF |
546 | break; |
547 | case DDIR_TRIM: | |
464981ff AF |
548 | if (options->write_zeroes_on_trim) { |
549 | blkioq_write_zeroes(data->q, io_u->offset, | |
550 | io_u->xfer_buflen, io_u, 0); | |
551 | } else { | |
552 | blkioq_discard(data->q, io_u->offset, | |
553 | io_u->xfer_buflen, io_u, 0); | |
554 | } | |
a601337a AF |
555 | break; |
556 | case DDIR_SYNC: | |
557 | case DDIR_DATASYNC: | |
558 | blkioq_flush(data->q, io_u, 0); | |
559 | break; | |
560 | default: | |
561 | io_u->error = ENOTSUP; | |
562 | io_u_log_error(td, io_u); | |
563 | return FIO_Q_COMPLETED; | |
564 | } | |
565 | ||
566 | return FIO_Q_QUEUED; | |
567 | } | |
568 | ||
569 | static int fio_blkio_getevents(struct thread_data *td, unsigned int min, | |
570 | unsigned int max, const struct timespec *t) | |
571 | { | |
b158577d | 572 | const struct fio_blkio_options *options = td->eo; |
a601337a | 573 | struct fio_blkio_data *data = td->io_ops_data; |
b158577d AF |
574 | int ret, n; |
575 | uint64_t event; | |
576 | ||
577 | switch (options->wait_mode) { | |
578 | case FIO_BLKIO_WAIT_MODE_BLOCK: | |
579 | n = blkioq_do_io(data->q, data->completions, (int)min, (int)max, | |
580 | NULL); | |
581 | if (n < 0) { | |
582 | fio_blkio_log_err(blkioq_do_io); | |
583 | return -1; | |
584 | } | |
585 | return n; | |
586 | case FIO_BLKIO_WAIT_MODE_EVENTFD: | |
587 | n = blkioq_do_io(data->q, data->completions, 0, (int)max, NULL); | |
588 | if (n < 0) { | |
589 | fio_blkio_log_err(blkioq_do_io); | |
590 | return -1; | |
591 | } | |
592 | while (n < (int)min) { | |
593 | ret = read(data->completion_fd, &event, sizeof(event)); | |
594 | if (ret != sizeof(event)) { | |
595 | log_err("fio: read() on the completion fd returned %d\n", | |
596 | ret); | |
597 | return -1; | |
598 | } | |
a601337a | 599 | |
b158577d AF |
600 | ret = blkioq_do_io(data->q, data->completions + n, 0, |
601 | (int)max - n, NULL); | |
602 | if (ret < 0) { | |
603 | fio_blkio_log_err(blkioq_do_io); | |
604 | return -1; | |
605 | } | |
606 | ||
607 | n += ret; | |
608 | } | |
609 | return n; | |
610 | case FIO_BLKIO_WAIT_MODE_LOOP: | |
611 | for (n = 0; n < (int)min; ) { | |
612 | ret = blkioq_do_io(data->q, data->completions + n, 0, | |
613 | (int)max - n, NULL); | |
614 | if (ret < 0) { | |
615 | fio_blkio_log_err(blkioq_do_io); | |
616 | return -1; | |
617 | } | |
618 | ||
619 | n += ret; | |
620 | } | |
621 | return n; | |
622 | default: | |
a601337a AF |
623 | return -1; |
624 | } | |
a601337a AF |
625 | } |
626 | ||
627 | static struct io_u *fio_blkio_event(struct thread_data *td, int event) | |
628 | { | |
629 | struct fio_blkio_data *data = td->io_ops_data; | |
630 | struct blkio_completion *completion = &data->completions[event]; | |
631 | struct io_u *io_u = completion->user_data; | |
632 | ||
633 | io_u->error = -completion->ret; | |
634 | ||
635 | return io_u; | |
636 | } | |
637 | ||
638 | FIO_STATIC struct ioengine_ops ioengine = { | |
639 | .name = "libblkio", | |
640 | .version = FIO_IOOPS_VERSION, | |
641 | .flags = FIO_DISKLESSIO | FIO_NOEXTEND | | |
ef9b6f2f | 642 | FIO_NO_OFFLOAD | FIO_SKIPPABLE_IOMEM_ALLOC, |
a601337a AF |
643 | |
644 | .setup = fio_blkio_setup, | |
645 | .init = fio_blkio_init, | |
ef9b6f2f | 646 | .post_init = fio_blkio_post_init, |
a601337a AF |
647 | .cleanup = fio_blkio_cleanup, |
648 | ||
649 | .iomem_alloc = fio_blkio_iomem_alloc, | |
650 | .iomem_free = fio_blkio_iomem_free, | |
651 | ||
652 | .open_file = fio_blkio_open_file, | |
653 | ||
654 | .queue = fio_blkio_queue, | |
655 | .getevents = fio_blkio_getevents, | |
656 | .event = fio_blkio_event, | |
657 | ||
658 | .options = options, | |
659 | .option_struct_size = sizeof(struct fio_blkio_options), | |
660 | }; | |
661 | ||
662 | static void fio_init fio_blkio_register(void) | |
663 | { | |
664 | register_ioengine(&ioengine); | |
665 | } | |
666 | ||
667 | static void fio_exit fio_blkio_unregister(void) | |
668 | { | |
669 | unregister_ioengine(&ioengine); | |
670 | } |