Don't truncate files if we don't need to extend them
[fio.git] / filesetup.c
... / ...
CommitLineData
1#include <unistd.h>
2#include <fcntl.h>
3#include <string.h>
4#include <assert.h>
5#include <dirent.h>
6#include <sys/stat.h>
7#include <sys/mman.h>
8#include <sys/types.h>
9
10#include "fio.h"
11
12static int root_warn;
13
14static int extend_file(struct thread_data *td, struct fio_file *f)
15{
16 int r, new_layout = 0, unlink_file = 0, flags;
17 unsigned long long left;
18 unsigned int bs;
19 char *b;
20
21 if (read_only) {
22 log_err("fio: refusing extend of file due to read-only\n");
23 return 0;
24 }
25
26 /*
27 * check if we need to lay the file out complete again. fio
28 * does that for operations involving reads, or for writes
29 * where overwrite is set
30 */
31 if (td_read(td) || (td_write(td) && td->o.overwrite))
32 new_layout = 1;
33 if (td_write(td) && !td->o.overwrite)
34 unlink_file = 1;
35
36 if ((unlink_file || new_layout) && (f->flags & FIO_FILE_EXISTS)) {
37 if (unlink(f->file_name) < 0) {
38 td_verror(td, errno, "unlink");
39 return 1;
40 }
41 }
42
43 flags = O_WRONLY | O_CREAT;
44 if (new_layout)
45 flags |= O_TRUNC;
46
47 f->fd = open(f->file_name, flags, 0644);
48 if (f->fd < 0) {
49 td_verror(td, errno, "open");
50 return 1;
51 }
52
53 if (!new_layout)
54 goto done;
55
56 if (ftruncate(f->fd, f->real_file_size) == -1) {
57 td_verror(td, errno, "ftruncate");
58 goto err;
59 }
60
61 if (posix_fallocate(f->fd, 0, f->real_file_size) < 0) {
62 td_verror(td, errno, "posix_fallocate");
63 goto err;
64 }
65
66 b = malloc(td->o.max_bs[DDIR_WRITE]);
67 memset(b, 0, td->o.max_bs[DDIR_WRITE]);
68
69 left = f->real_file_size;
70 while (left && !td->terminate) {
71 bs = td->o.max_bs[DDIR_WRITE];
72 if (bs > left)
73 bs = left;
74
75 r = write(f->fd, b, bs);
76
77 if (r == (int) bs) {
78 left -= bs;
79 continue;
80 } else {
81 if (r < 0)
82 td_verror(td, errno, "write");
83 else
84 td_verror(td, EIO, "write");
85
86 break;
87 }
88 }
89
90 if (td->terminate)
91 unlink(f->file_name);
92 else if (td->o.create_fsync)
93 fsync(f->fd);
94
95 free(b);
96done:
97 close(f->fd);
98 f->fd = -1;
99 return 0;
100err:
101 close(f->fd);
102 f->fd = -1;
103 return 1;
104}
105
106static unsigned long long get_rand_file_size(struct thread_data *td)
107{
108 unsigned long long ret;
109 long r;
110
111 r = os_random_long(&td->file_size_state);
112 ret = td->o.file_size_low + (unsigned long long) ((double) (td->o.file_size_high - td->o.file_size_low) * (r / (RAND_MAX + 1.0)));
113 ret -= (ret % td->o.rw_min_bs);
114 return ret;
115}
116
117static int file_size(struct thread_data *td, struct fio_file *f)
118{
119 struct stat st;
120
121 if (fstat(f->fd, &st) == -1) {
122 td_verror(td, errno, "fstat");
123 return 1;
124 }
125
126 f->real_file_size = st.st_size;
127 return 0;
128}
129
130static int bdev_size(struct thread_data *td, struct fio_file *f)
131{
132 unsigned long long bytes;
133 int r;
134
135 r = blockdev_size(f->fd, &bytes);
136 if (r) {
137 td_verror(td, r, "blockdev_size");
138 return 1;
139 }
140
141 f->real_file_size = bytes;
142 return 0;
143}
144
145static int get_file_size(struct thread_data *td, struct fio_file *f)
146{
147 int ret = 0;
148
149 if (f->flags & FIO_SIZE_KNOWN)
150 return 0;
151
152 if (f->filetype == FIO_TYPE_FILE)
153 ret = file_size(td, f);
154 else if (f->filetype == FIO_TYPE_BD)
155 ret = bdev_size(td, f);
156 else
157 f->real_file_size = -1;
158
159 if (ret)
160 return ret;
161
162 if (f->file_offset > f->real_file_size) {
163 log_err("%s: offset extends end (%Lu > %Lu)\n", td->o.name, f->file_offset, f->real_file_size);
164 return 1;
165 }
166
167 f->flags |= FIO_SIZE_KNOWN;
168 return 0;
169}
170
171int file_invalidate_cache(struct thread_data *td, struct fio_file *f)
172{
173 int ret = 0;
174
175 if (td->o.odirect)
176 return 0;
177
178 /*
179 * FIXME: add blockdev flushing too
180 */
181 if (f->mmap)
182 ret = madvise(f->mmap, f->io_size, MADV_DONTNEED);
183 else if (f->filetype == FIO_TYPE_FILE)
184 ret = fadvise(f->fd, f->file_offset, f->io_size, POSIX_FADV_DONTNEED);
185 else if (f->filetype == FIO_TYPE_BD) {
186 ret = blockdev_invalidate_cache(f->fd);
187 if (ret < 0 && errno == EACCES && geteuid()) {
188 if (!root_warn) {
189 log_err("fio: only root may flush block devices. Cache flush bypassed!\n");
190 root_warn = 1;
191 }
192 ret = 0;
193 }
194 } else if (f->filetype == FIO_TYPE_CHAR || f->filetype == FIO_TYPE_PIPE)
195 ret = 0;
196
197 if (ret < 0) {
198 td_verror(td, errno, "invalidate_cache");
199 return 1;
200 }
201
202 return ret;
203}
204
205void generic_close_file(struct thread_data fio_unused *td, struct fio_file *f)
206{
207 close(f->fd);
208 f->fd = -1;
209}
210
211int generic_open_file(struct thread_data *td, struct fio_file *f)
212{
213 int is_std = 0;
214 int flags = 0;
215
216 if (!strcmp(f->file_name, "-")) {
217 if (td_rw(td)) {
218 log_err("fio: can't read/write to stdin/out\n");
219 return 1;
220 }
221 is_std = 1;
222
223 /*
224 * move output logging to stderr, if we are writing to stdout
225 */
226 if (td_write(td))
227 f_out = stderr;
228 }
229
230 if (td->o.odirect)
231 flags |= OS_O_DIRECT;
232 if (td->o.sync_io)
233 flags |= O_SYNC;
234 if (f->filetype != FIO_TYPE_FILE)
235 flags |= O_NOATIME;
236
237open_again:
238 if (td_write(td)) {
239 assert(!read_only);
240
241 flags |= O_RDWR;
242
243 if (f->filetype == FIO_TYPE_FILE)
244 flags |= O_CREAT;
245
246 if (is_std)
247 f->fd = dup(STDOUT_FILENO);
248 else
249 f->fd = open(f->file_name, flags, 0600);
250 } else {
251 if (f->filetype == FIO_TYPE_CHAR && !read_only)
252 flags |= O_RDWR;
253 else
254 flags |= O_RDONLY;
255
256 if (is_std)
257 f->fd = dup(STDIN_FILENO);
258 else
259 f->fd = open(f->file_name, flags);
260 }
261
262 if (f->fd == -1) {
263 char buf[FIO_VERROR_SIZE];
264 int __e = errno;
265
266 if (errno == EPERM && (flags & O_NOATIME)) {
267 flags &= ~O_NOATIME;
268 goto open_again;
269 }
270
271 snprintf(buf, sizeof(buf) - 1, "open(%s)", f->file_name);
272
273 td_verror(td, __e, buf);
274 }
275
276 if (get_file_size(td, f))
277 goto err;
278
279 return 0;
280err:
281 close(f->fd);
282 return 1;
283}
284
285int open_files(struct thread_data *td)
286{
287 struct fio_file *f;
288 unsigned int i;
289 int err = 0;
290
291 for_each_file(td, f, i) {
292 err = td_io_open_file(td, f);
293 if (err) {
294 if (td->error == EMFILE) {
295 log_err("fio: limited open files to: %d\n", td->nr_open_files);
296 td->o.open_files = td->nr_open_files;
297 err = 0;
298 clear_error(td);
299 }
300 break;
301 }
302
303 if (td->o.open_files == td->nr_open_files)
304 break;
305 }
306
307 if (!err)
308 return 0;
309
310 for_each_file(td, f, i)
311 td_io_close_file(td, f);
312
313 return err;
314}
315
316/*
317 * open/close all files, so that ->real_file_size gets set
318 */
319static int get_file_sizes(struct thread_data *td)
320{
321 struct fio_file *f;
322 unsigned int i;
323 int err = 0;
324
325 for_each_file(td, f, i) {
326 if (td->io_ops->open_file(td, f)) {
327 if (td->error != ENOENT) {
328 log_err("%s\n", td->verror);
329 err = 1;
330 }
331 clear_error(td);
332 } else {
333 if (td->io_ops->close_file)
334 td->io_ops->close_file(td, f);
335 }
336
337 if (f->real_file_size == -1ULL && td->o.size)
338 f->real_file_size = td->o.size / td->o.nr_files;
339 }
340
341 return err;
342}
343
344/*
345 * Open the files and setup files sizes, creating files if necessary.
346 */
347int setup_files(struct thread_data *td)
348{
349 unsigned long long total_size, extend_size;
350 struct fio_file *f;
351 unsigned int i;
352 int err = 0, need_extend;
353
354 /*
355 * if ioengine defines a setup() method, it's responsible for
356 * opening the files and setting f->real_file_size to indicate
357 * the valid range for that file.
358 */
359 if (td->io_ops->setup)
360 err = td->io_ops->setup(td);
361 else
362 err = get_file_sizes(td);
363
364 if (err)
365 return err;
366
367 /*
368 * check sizes. if the files/devices do not exist and the size
369 * isn't passed to fio, abort.
370 */
371 total_size = 0;
372 for_each_file(td, f, i) {
373 if (f->real_file_size == -1ULL)
374 total_size = -1ULL;
375 else
376 total_size += f->real_file_size;
377 }
378
379 /*
380 * device/file sizes are zero and no size given, punt
381 */
382 if ((!total_size || total_size == -1ULL) && !td->o.size &&
383 !(td->io_ops->flags & FIO_NOIO) && !td->o.fill_device) {
384 log_err("%s: you need to specify size=\n", td->o.name);
385 td_verror(td, EINVAL, "total_file_size");
386 return 1;
387 }
388
389 /*
390 * now file sizes are known, so we can set ->io_size. if size= is
391 * not given, ->io_size is just equal to ->real_file_size. if size
392 * is given, ->io_size is size / nr_files.
393 */
394 extend_size = total_size = 0;
395 need_extend = 0;
396 for_each_file(td, f, i) {
397 f->file_offset = td->o.start_offset;
398
399 if (!td->o.file_size_low) {
400 /*
401 * no file size range given, file size is equal to
402 * total size divided by number of files. if that is
403 * zero, set it to the real file size.
404 */
405 f->io_size = td->o.size / td->o.nr_files;
406 if ((!f->io_size || f->io_size > f->real_file_size) &&
407 f->real_file_size) {
408 if (f->file_offset > f->real_file_size)
409 goto err_offset;
410 f->io_size = f->real_file_size - f->file_offset;
411 }
412 } else if (f->real_file_size < td->o.file_size_low ||
413 f->real_file_size > td->o.file_size_high) {
414 if (f->file_offset > td->o.file_size_low)
415 goto err_offset;
416 /*
417 * file size given. if it's fixed, use that. if it's a
418 * range, generate a random size in-between.
419 */
420 if (td->o.file_size_low == td->o.file_size_high)
421 f->io_size = td->o.file_size_low - f->file_offset;
422 else
423 f->io_size = get_rand_file_size(td) - f->file_offset;
424 } else if (f->file_offset > f->real_file_size)
425 goto err_offset;
426 else
427 f->io_size = f->real_file_size - f->file_offset;
428
429 if (f->io_size == -1ULL)
430 total_size = -1ULL;
431 else
432 total_size += f->io_size;
433
434 if (f->filetype == FIO_TYPE_FILE &&
435 (f->io_size + f->file_offset) > f->real_file_size &&
436 !(td->io_ops->flags & FIO_DISKLESSIO)) {
437 need_extend++;
438 extend_size += (f->io_size + f->file_offset);
439 f->flags |= FIO_FILE_EXTEND;
440 }
441 }
442
443 if (!td->o.size || td->o.size > total_size)
444 td->o.size = total_size;
445
446 /*
447 * See if we need to extend some files
448 */
449 if (need_extend) {
450 temp_stall_ts = 1;
451 log_info("%s: Laying out IO file(s) (%u file(s) / %LuMiB)\n",
452 td->o.name, need_extend, extend_size >> 20);
453
454 for_each_file(td, f, i) {
455 if (!(f->flags & FIO_FILE_EXTEND))
456 continue;
457
458 assert(f->filetype == FIO_TYPE_FILE);
459 f->flags &= ~FIO_FILE_EXTEND;
460 f->real_file_size = (f->io_size + f->file_offset);
461 err = extend_file(td, f);
462 if (err)
463 break;
464 }
465 temp_stall_ts = 0;
466 }
467
468 if (err)
469 return err;
470
471 if (!td->o.zone_size)
472 td->o.zone_size = td->o.size;
473
474 /*
475 * iolog already set the total io size, if we read back
476 * stored entries.
477 */
478 if (!td->o.read_iolog_file)
479 td->total_io_size = td->o.size * td->o.loops;
480 return 0;
481err_offset:
482 log_err("%s: you need to specify valid offset=\n", td->o.name);
483 return 1;
484}
485
486int init_random_map(struct thread_data *td)
487{
488 unsigned long long blocks, num_maps;
489 struct fio_file *f;
490 unsigned int i;
491
492 if (td->o.norandommap)
493 return 0;
494
495 for_each_file(td, f, i) {
496 blocks = (f->real_file_size + td->o.rw_min_bs - 1) / (unsigned long long) td->o.rw_min_bs;
497 num_maps = (blocks + BLOCKS_PER_MAP-1)/ (unsigned long long) BLOCKS_PER_MAP;
498 f->file_map = malloc(num_maps * sizeof(long));
499 if (!f->file_map) {
500 log_err("fio: failed allocating random map. If running a large number of jobs, try the 'norandommap' option\n");
501 return 1;
502 }
503 f->num_maps = num_maps;
504 memset(f->file_map, 0, num_maps * sizeof(long));
505 }
506
507 return 0;
508}
509
510void close_files(struct thread_data *td)
511{
512 struct fio_file *f;
513 unsigned int i;
514
515 for_each_file(td, f, i) {
516 if (td->o.unlink && f->filetype == FIO_TYPE_FILE)
517 unlink(f->file_name);
518
519 td_io_close_file(td, f);
520
521 free(f->file_name);
522 f->file_name = NULL;
523
524 if (f->file_map) {
525 free(f->file_map);
526 f->file_map = NULL;
527 }
528 }
529
530 td->o.filename = NULL;
531 free(td->files);
532 td->files = NULL;
533 td->o.nr_files = 0;
534}
535
536static void get_file_type(struct fio_file *f)
537{
538 struct stat sb;
539
540 if (!strcmp(f->file_name, "-"))
541 f->filetype = FIO_TYPE_PIPE;
542 else
543 f->filetype = FIO_TYPE_FILE;
544
545 if (!lstat(f->file_name, &sb)) {
546 if (S_ISBLK(sb.st_mode))
547 f->filetype = FIO_TYPE_BD;
548 else if (S_ISCHR(sb.st_mode))
549 f->filetype = FIO_TYPE_CHAR;
550 else if (S_ISFIFO(sb.st_mode))
551 f->filetype = FIO_TYPE_PIPE;
552 }
553}
554
555int add_file(struct thread_data *td, const char *fname)
556{
557 int cur_files = td->files_index;
558 char file_name[PATH_MAX];
559 struct fio_file *f;
560 int len = 0;
561
562 td->files = realloc(td->files, (cur_files + 1) * sizeof(*f));
563
564 f = &td->files[cur_files];
565 memset(f, 0, sizeof(*f));
566 f->fd = -1;
567
568 /*
569 * init function, io engine may not be loaded yet
570 */
571 if (td->io_ops && (td->io_ops->flags & FIO_DISKLESSIO))
572 f->real_file_size = -1ULL;
573
574 if (td->o.directory)
575 len = sprintf(file_name, "%s/", td->o.directory);
576
577 sprintf(file_name + len, "%s", fname);
578 f->file_name = strdup(file_name);
579
580 get_file_type(f);
581
582 td->files_index++;
583 if (f->filetype == FIO_TYPE_FILE)
584 td->nr_normal_files++;
585
586 return cur_files;
587}
588
589void get_file(struct fio_file *f)
590{
591 assert(f->flags & FIO_FILE_OPEN);
592 f->references++;
593}
594
595void put_file(struct thread_data *td, struct fio_file *f)
596{
597 if (!(f->flags & FIO_FILE_OPEN))
598 return;
599
600 assert(f->references);
601 if (--f->references)
602 return;
603
604 if (should_fsync(td) && td->o.fsync_on_close)
605 fsync(f->fd);
606
607 if (td->io_ops->close_file)
608 td->io_ops->close_file(td, f);
609
610 td->nr_open_files--;
611 f->flags &= ~FIO_FILE_OPEN;
612}
613
614static int recurse_dir(struct thread_data *td, const char *dirname)
615{
616 struct dirent *dir;
617 int ret = 0;
618 DIR *D;
619
620 D = opendir(dirname);
621 if (!D) {
622 char buf[FIO_VERROR_SIZE];
623
624 snprintf(buf, FIO_VERROR_SIZE - 1, "opendir(%s)", dirname);
625 td_verror(td, errno, buf);
626 return 1;
627 }
628
629 while ((dir = readdir(D)) != NULL) {
630 char full_path[PATH_MAX];
631 struct stat sb;
632
633 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
634 continue;
635
636 sprintf(full_path, "%s/%s", dirname, dir->d_name);
637
638 if (lstat(full_path, &sb) == -1) {
639 if (errno != ENOENT) {
640 td_verror(td, errno, "stat");
641 return 1;
642 }
643 }
644
645 if (S_ISREG(sb.st_mode)) {
646 add_file(td, full_path);
647 td->o.nr_files++;
648 continue;
649 }
650 if (!S_ISDIR(sb.st_mode))
651 continue;
652
653 if ((ret = recurse_dir(td, full_path)) != 0)
654 break;
655 }
656
657 closedir(D);
658 return ret;
659}
660
661int add_dir_files(struct thread_data *td, const char *path)
662{
663 int ret = recurse_dir(td, path);
664
665 if (!ret)
666 log_info("fio: opendir added %d files\n", td->o.nr_files);
667
668 return ret;
669}
670
671void dup_files(struct thread_data *td, struct thread_data *org)
672{
673 struct fio_file *f;
674 unsigned int i;
675 size_t bytes;
676
677 if (!org->files)
678 return;
679
680 bytes = org->files_index * sizeof(*f);
681 td->files = malloc(bytes);
682 memcpy(td->files, org->files, bytes);
683
684 for_each_file(td, f, i) {
685 if (f->file_name)
686 f->file_name = strdup(f->file_name);
687 }
688}
689
690/*
691 * Returns the index that matches the filename, or -1 if not there
692 */
693int get_fileno(struct thread_data *td, const char *fname)
694{
695 struct fio_file *f;
696 unsigned int i;
697
698 for_each_file(td, f, i)
699 if (!strcmp(f->file_name, fname))
700 return i;
701
702 return -1;
703}
704
705/*
706 * For log usage, where we add/open/close files automatically
707 */
708void free_release_files(struct thread_data *td)
709{
710 close_files(td);
711 td->files_index = 0;
712 td->nr_normal_files = 0;
713}