Commit | Line | Data |
---|---|---|
bf481692 JA |
1 | /* |
2 | * Small tool to check for dedupable blocks in a file or device. Basically | |
3 | * just scans the filename for extents of the given size, checksums them, | |
4 | * and orders them up. | |
5 | */ | |
6 | #include <stdio.h> | |
7 | #include <stdio.h> | |
8 | #include <unistd.h> | |
9 | #include <inttypes.h> | |
10 | #include <assert.h> | |
11 | #include <sys/types.h> | |
12 | #include <sys/stat.h> | |
13 | #include <sys/ioctl.h> | |
14 | #include <linux/fs.h> | |
15 | #include <fcntl.h> | |
16 | #include <string.h> | |
17 | ||
18 | #include "../lib/rbtree.h" | |
19 | #include "../flist.h" | |
20 | #include "../log.h" | |
21 | #include "../mutex.h" | |
22 | #include "../smalloc.h" | |
23 | #include "../minmax.h" | |
24 | #include "../crc/md5.h" | |
25 | #include "../memalign.h" | |
26 | #include "../os/os.h" | |
5a155943 JA |
27 | #include "../gettime.h" |
28 | #include "../fio_time.h" | |
bf481692 | 29 | |
fa88cd09 | 30 | #include "../lib/bloom.h" |
9077ee4a | 31 | #include "debug.h" |
bf481692 JA |
32 | |
33 | struct worker_thread { | |
34 | pthread_t thread; | |
35 | ||
4d53d6c0 JA |
36 | volatile int done; |
37 | ||
bf481692 JA |
38 | int fd; |
39 | uint64_t cur_offset; | |
40 | uint64_t size; | |
41 | ||
42 | unsigned long items; | |
fa88cd09 | 43 | unsigned long dupes; |
bf481692 JA |
44 | int err; |
45 | }; | |
46 | ||
47 | struct extent { | |
48 | struct flist_head list; | |
49 | uint64_t offset; | |
50 | }; | |
51 | ||
52 | struct chunk { | |
53 | struct rb_node rb_node; | |
bf481692 JA |
54 | uint64_t count; |
55 | uint32_t hash[MD5_HASH_WORDS]; | |
5a155943 | 56 | struct flist_head extent_list[0]; |
bf481692 JA |
57 | }; |
58 | ||
59 | struct item { | |
60 | uint64_t offset; | |
61 | uint32_t hash[MD5_HASH_WORDS]; | |
62 | }; | |
63 | ||
64 | static struct rb_root rb_root; | |
fa88cd09 | 65 | static struct bloom *bloom; |
bf481692 JA |
66 | static struct fio_mutex *rb_lock; |
67 | ||
68 | static unsigned int blocksize = 4096; | |
69 | static unsigned int num_threads; | |
70 | static unsigned int chunk_size = 1048576; | |
71 | static unsigned int dump_output; | |
72 | static unsigned int odirect; | |
73 | static unsigned int collision_check; | |
4d53d6c0 | 74 | static unsigned int print_progress = 1; |
fa88cd09 | 75 | static unsigned int use_bloom = 1; |
bf481692 JA |
76 | |
77 | static uint64_t total_size; | |
78 | static uint64_t cur_offset; | |
79 | static struct fio_mutex *size_lock; | |
80 | ||
81 | static int dev_fd; | |
82 | ||
83 | static uint64_t get_size(int fd, struct stat *sb) | |
84 | { | |
85 | uint64_t ret; | |
86 | ||
87 | if (S_ISBLK(sb->st_mode)) { | |
88 | if (ioctl(fd, BLKGETSIZE64, &ret) < 0) { | |
89 | perror("ioctl"); | |
90 | return 0; | |
91 | } | |
92 | } else | |
93 | ret = sb->st_size; | |
94 | ||
95 | return (ret & ~((uint64_t)blocksize - 1)); | |
96 | } | |
97 | ||
98 | static int get_work(uint64_t *offset, uint64_t *size) | |
99 | { | |
100 | uint64_t this_chunk; | |
101 | int ret = 1; | |
102 | ||
103 | fio_mutex_down(size_lock); | |
104 | ||
105 | if (cur_offset < total_size) { | |
106 | *offset = cur_offset; | |
107 | this_chunk = min((uint64_t)chunk_size, total_size - cur_offset); | |
108 | *size = this_chunk; | |
109 | cur_offset += this_chunk; | |
110 | ret = 0; | |
111 | } | |
112 | ||
113 | fio_mutex_up(size_lock); | |
114 | return ret; | |
115 | } | |
116 | ||
117 | static int read_block(int fd, void *buf, off_t offset) | |
118 | { | |
119 | ssize_t ret; | |
120 | ||
121 | ret = pread(fd, buf, blocksize, offset); | |
122 | if (ret < 0) { | |
123 | perror("pread"); | |
124 | return 1; | |
125 | } else if (!ret) | |
126 | return 1; | |
127 | else if (ret != blocksize) { | |
128 | log_err("dedupe: short read on block\n"); | |
129 | return 1; | |
130 | } | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | static void add_item(struct chunk *c, struct item *i) | |
136 | { | |
87818659 JA |
137 | /* |
138 | * Save some memory and don't add extent items, if we don't | |
139 | * use them. | |
140 | */ | |
141 | if (dump_output || collision_check) { | |
142 | struct extent *e; | |
143 | ||
144 | e = malloc(sizeof(*e)); | |
145 | e->offset = i->offset; | |
5a155943 | 146 | flist_add_tail(&e->list, &c->extent_list[0]); |
87818659 | 147 | } |
bf481692 | 148 | |
bf481692 JA |
149 | c->count++; |
150 | } | |
151 | ||
152 | static int col_check(struct chunk *c, struct item *i) | |
153 | { | |
154 | struct extent *e; | |
155 | char *cbuf, *ibuf; | |
156 | int ret = 1; | |
157 | ||
158 | cbuf = fio_memalign(blocksize, blocksize); | |
159 | ibuf = fio_memalign(blocksize, blocksize); | |
160 | ||
5a155943 | 161 | e = flist_entry(c->extent_list[0].next, struct extent, list); |
bf481692 JA |
162 | if (read_block(dev_fd, cbuf, e->offset)) |
163 | goto out; | |
164 | ||
165 | if (read_block(dev_fd, ibuf, i->offset)) | |
166 | goto out; | |
167 | ||
168 | ret = memcmp(ibuf, cbuf, blocksize); | |
169 | out: | |
170 | fio_memfree(cbuf, blocksize); | |
171 | fio_memfree(ibuf, blocksize); | |
172 | return ret; | |
173 | } | |
174 | ||
5a155943 JA |
175 | static struct chunk *alloc_chunk(void) |
176 | { | |
177 | struct chunk *c; | |
178 | ||
179 | if (collision_check || dump_output) { | |
180 | c = malloc(sizeof(struct chunk) + sizeof(struct flist_head)); | |
181 | INIT_FLIST_HEAD(&c->extent_list[0]); | |
182 | } else | |
183 | c = malloc(sizeof(struct chunk)); | |
184 | ||
185 | return c; | |
186 | } | |
187 | ||
bf481692 JA |
188 | static void insert_chunk(struct item *i) |
189 | { | |
190 | struct rb_node **p, *parent; | |
191 | struct chunk *c; | |
192 | int diff; | |
193 | ||
194 | p = &rb_root.rb_node; | |
195 | parent = NULL; | |
196 | while (*p) { | |
197 | parent = *p; | |
198 | ||
199 | c = rb_entry(parent, struct chunk, rb_node); | |
200 | diff = memcmp(i->hash, c->hash, sizeof(i->hash)); | |
201 | if (diff < 0) | |
202 | p = &(*p)->rb_left; | |
203 | else if (diff > 0) | |
204 | p = &(*p)->rb_right; | |
205 | else { | |
206 | int ret; | |
207 | ||
208 | if (!collision_check) | |
209 | goto add; | |
210 | ||
211 | fio_mutex_up(rb_lock); | |
212 | ret = col_check(c, i); | |
213 | fio_mutex_down(rb_lock); | |
214 | ||
215 | if (!ret) | |
216 | goto add; | |
217 | ||
218 | p = &(*p)->rb_right; | |
219 | } | |
220 | } | |
221 | ||
5a155943 | 222 | c = alloc_chunk(); |
bf481692 | 223 | RB_CLEAR_NODE(&c->rb_node); |
bf481692 JA |
224 | c->count = 0; |
225 | memcpy(c->hash, i->hash, sizeof(i->hash)); | |
226 | rb_link_node(&c->rb_node, parent, p); | |
227 | rb_insert_color(&c->rb_node, &rb_root); | |
228 | add: | |
229 | add_item(c, i); | |
230 | } | |
231 | ||
fa88cd09 JA |
232 | static void insert_chunks(struct item *items, unsigned int nitems, |
233 | uint64_t *ndupes) | |
bf481692 JA |
234 | { |
235 | int i; | |
236 | ||
237 | fio_mutex_down(rb_lock); | |
238 | ||
fa88cd09 JA |
239 | for (i = 0; i < nitems; i++) { |
240 | if (bloom) { | |
241 | unsigned int s; | |
242 | int r; | |
243 | ||
244 | s = sizeof(items[i].hash) / sizeof(uint32_t); | |
245 | r = bloom_set(bloom, items[i].hash, s); | |
246 | *ndupes += r; | |
247 | } else | |
248 | insert_chunk(&items[i]); | |
249 | } | |
bf481692 JA |
250 | |
251 | fio_mutex_up(rb_lock); | |
252 | } | |
253 | ||
254 | static void crc_buf(void *buf, uint32_t *hash) | |
255 | { | |
256 | struct fio_md5_ctx ctx = { .hash = hash }; | |
257 | ||
258 | fio_md5_init(&ctx); | |
259 | fio_md5_update(&ctx, buf, blocksize); | |
260 | fio_md5_final(&ctx); | |
261 | } | |
262 | ||
263 | static int do_work(struct worker_thread *thread, void *buf) | |
264 | { | |
265 | unsigned int nblocks, i; | |
266 | off_t offset; | |
267 | int err = 0, nitems = 0; | |
fa88cd09 | 268 | uint64_t ndupes = 0; |
bf481692 JA |
269 | struct item *items; |
270 | ||
271 | nblocks = thread->size / blocksize; | |
272 | offset = thread->cur_offset; | |
273 | items = malloc(sizeof(*items) * nblocks); | |
274 | ||
275 | for (i = 0; i < nblocks; i++) { | |
276 | if (read_block(thread->fd, buf, offset)) | |
277 | break; | |
fa88cd09 JA |
278 | if (items) |
279 | items[i].offset = offset; | |
bf481692 JA |
280 | crc_buf(buf, items[i].hash); |
281 | offset += blocksize; | |
282 | nitems++; | |
283 | } | |
284 | ||
fa88cd09 JA |
285 | insert_chunks(items, nitems, &ndupes); |
286 | ||
bf481692 | 287 | free(items); |
fa88cd09 JA |
288 | thread->items += nitems; |
289 | thread->dupes += ndupes; | |
bf481692 JA |
290 | return err; |
291 | } | |
292 | ||
293 | static void *thread_fn(void *data) | |
294 | { | |
295 | struct worker_thread *thread = data; | |
296 | void *buf; | |
297 | ||
298 | buf = fio_memalign(blocksize, blocksize); | |
299 | ||
300 | do { | |
301 | if (get_work(&thread->cur_offset, &thread->size)) { | |
302 | thread->err = 1; | |
303 | break; | |
304 | } | |
305 | if (do_work(thread, buf)) { | |
306 | thread->err = 1; | |
307 | break; | |
308 | } | |
309 | } while (1); | |
310 | ||
4d53d6c0 | 311 | thread->done = 1; |
bf481692 JA |
312 | fio_memfree(buf, blocksize); |
313 | return NULL; | |
314 | } | |
315 | ||
5a155943 JA |
316 | static void show_progress(struct worker_thread *threads, unsigned long total) |
317 | { | |
318 | unsigned long last_nitems = 0; | |
319 | struct timeval last_tv; | |
320 | ||
321 | fio_gettime(&last_tv, NULL); | |
322 | ||
323 | while (print_progress) { | |
324 | unsigned long this_items; | |
325 | unsigned long nitems = 0; | |
326 | uint64_t tdiff; | |
327 | float perc; | |
328 | int some_done; | |
329 | int i; | |
330 | ||
331 | for (i = 0; i < num_threads; i++) { | |
332 | nitems += threads[i].items; | |
333 | some_done = threads[i].done; | |
334 | if (some_done) | |
335 | break; | |
336 | } | |
337 | ||
338 | if (some_done) | |
339 | break; | |
340 | ||
341 | perc = (float) nitems / (float) total; | |
342 | perc *= 100.0; | |
343 | this_items = nitems - last_nitems; | |
344 | this_items *= blocksize; | |
345 | tdiff = mtime_since_now(&last_tv); | |
346 | if (tdiff) { | |
347 | this_items /= tdiff; | |
348 | printf("%3.2f%% done (%luKB/sec)\r", perc, this_items); | |
349 | last_nitems = nitems; | |
350 | fio_gettime(&last_tv, NULL); | |
351 | } else | |
352 | printf("%3.2f%% done\r", perc); | |
353 | fflush(stdout); | |
354 | usleep(250000); | |
355 | }; | |
356 | } | |
357 | ||
fa88cd09 JA |
358 | static int run_dedupe_threads(int fd, uint64_t dev_size, uint64_t *nextents, |
359 | uint64_t *nchunks) | |
bf481692 JA |
360 | { |
361 | struct worker_thread *threads; | |
4d53d6c0 | 362 | unsigned long nitems, total_items; |
bf481692 JA |
363 | int i, err = 0; |
364 | ||
365 | total_size = dev_size; | |
4d53d6c0 | 366 | total_items = dev_size / blocksize; |
bf481692 JA |
367 | cur_offset = 0; |
368 | size_lock = fio_mutex_init(FIO_MUTEX_UNLOCKED); | |
369 | ||
370 | threads = malloc(num_threads * sizeof(struct worker_thread)); | |
371 | for (i = 0; i < num_threads; i++) { | |
372 | threads[i].fd = fd; | |
373 | threads[i].items = 0; | |
374 | threads[i].err = 0; | |
4d53d6c0 | 375 | threads[i].done = 0; |
bf481692 JA |
376 | |
377 | err = pthread_create(&threads[i].thread, NULL, thread_fn, &threads[i]); | |
378 | if (err) { | |
379 | log_err("fio: thread startup failed\n"); | |
380 | break; | |
381 | } | |
382 | } | |
383 | ||
5a155943 | 384 | show_progress(threads, total_items); |
4d53d6c0 | 385 | |
bf481692 | 386 | nitems = 0; |
fa88cd09 JA |
387 | *nextents = 0; |
388 | *nchunks = 1; | |
bf481692 JA |
389 | for (i = 0; i < num_threads; i++) { |
390 | void *ret; | |
391 | pthread_join(threads[i].thread, &ret); | |
392 | nitems += threads[i].items; | |
fa88cd09 | 393 | *nchunks += threads[i].dupes; |
bf481692 JA |
394 | } |
395 | ||
396 | printf("Threads(%u): %lu items processed\n", num_threads, nitems); | |
397 | ||
fa88cd09 JA |
398 | *nextents = nitems; |
399 | *nchunks = nitems - *nchunks; | |
400 | ||
bf481692 | 401 | fio_mutex_remove(size_lock); |
5a155943 | 402 | free(threads); |
bf481692 JA |
403 | return err; |
404 | } | |
405 | ||
fa88cd09 JA |
406 | static int dedupe_check(const char *filename, uint64_t *nextents, |
407 | uint64_t *nchunks) | |
bf481692 JA |
408 | { |
409 | uint64_t dev_size; | |
410 | struct stat sb; | |
411 | int flags; | |
412 | ||
413 | flags = O_RDONLY; | |
414 | if (odirect) | |
415 | flags |= O_DIRECT; | |
416 | ||
417 | dev_fd = open(filename, flags); | |
418 | if (dev_fd == -1) { | |
419 | perror("open"); | |
420 | return 1; | |
421 | } | |
422 | ||
423 | if (fstat(dev_fd, &sb) < 0) { | |
424 | perror("fstat"); | |
425 | close(dev_fd); | |
426 | return 1; | |
427 | } | |
428 | ||
429 | dev_size = get_size(dev_fd, &sb); | |
430 | if (!dev_size) { | |
431 | close(dev_fd); | |
432 | return 1; | |
433 | } | |
434 | ||
fa88cd09 JA |
435 | if (use_bloom) { |
436 | uint64_t bloom_entries; | |
437 | ||
438 | bloom_entries = (3 * dev_size ) / (blocksize * 2); | |
439 | bloom = bloom_new(bloom_entries); | |
440 | } | |
441 | ||
f7bd62dd | 442 | printf("Will check <%s>, size <%llu>, using %u threads\n", filename, (unsigned long long) dev_size, num_threads); |
bf481692 | 443 | |
fa88cd09 | 444 | return run_dedupe_threads(dev_fd, dev_size, nextents, nchunks); |
bf481692 JA |
445 | } |
446 | ||
447 | static void show_chunk(struct chunk *c) | |
448 | { | |
449 | struct flist_head *n; | |
450 | struct extent *e; | |
451 | ||
761c2729 | 452 | printf("c hash %8x %8x %8x %8x, count %lu\n", c->hash[0], c->hash[1], c->hash[2], c->hash[3], (unsigned long) c->count); |
5a155943 | 453 | flist_for_each(n, &c->extent_list[0]) { |
bf481692 | 454 | e = flist_entry(n, struct extent, list); |
761c2729 | 455 | printf("\toffset %llu\n", (unsigned long long) e->offset); |
bf481692 JA |
456 | } |
457 | } | |
458 | ||
fa88cd09 | 459 | static void show_stat(uint64_t nextents, uint64_t nchunks) |
bf481692 | 460 | { |
bf481692 JA |
461 | double perc; |
462 | ||
fa88cd09 JA |
463 | printf("Extents=%lu, Unique extents=%lu\n", (unsigned long) nextents, (unsigned long) nchunks); |
464 | printf("De-dupe factor: %3.2f\n", (double) nextents / (double) nchunks); | |
465 | ||
466 | perc = 1.00 - ((double) nchunks / (double) nextents); | |
467 | perc *= 100.0; | |
468 | printf("Fio setting: dedupe_percentage=%u\n", (int) (perc + 0.50)); | |
469 | ||
470 | } | |
471 | ||
472 | static void iter_rb_tree(uint64_t *nextents, uint64_t *nchunks) | |
473 | { | |
474 | struct rb_node *n; | |
475 | ||
476 | *nchunks = *nextents = 0; | |
bf481692 JA |
477 | |
478 | n = rb_first(&rb_root); | |
479 | if (!n) | |
480 | return; | |
481 | ||
482 | do { | |
483 | struct chunk *c; | |
484 | ||
485 | c = rb_entry(n, struct chunk, rb_node); | |
fa88cd09 JA |
486 | (*nchunks)++; |
487 | *nextents += c->count; | |
bf481692 JA |
488 | |
489 | if (dump_output) | |
490 | show_chunk(c); | |
491 | ||
492 | } while ((n = rb_next(n)) != NULL); | |
bf481692 JA |
493 | } |
494 | ||
495 | static int usage(char *argv[]) | |
496 | { | |
497 | log_err("Check for dedupable blocks on a device/file\n\n"); | |
498 | log_err("%s: [options] <device or file>\n", argv[0]); | |
499 | log_err("\t-b\tChunk size to use\n"); | |
500 | log_err("\t-t\tNumber of threads to use\n"); | |
501 | log_err("\t-d\tFull extent/chunk debug output\n"); | |
502 | log_err("\t-o\tUse O_DIRECT\n"); | |
503 | log_err("\t-c\tFull collision check\n"); | |
fa88cd09 | 504 | log_err("\t-B\tUse probabilistic bloom filter\n"); |
4d53d6c0 | 505 | log_err("\t-p\tPrint progress indicator\n"); |
bf481692 JA |
506 | return 1; |
507 | } | |
508 | ||
509 | int main(int argc, char *argv[]) | |
510 | { | |
fa88cd09 | 511 | uint64_t nextents, nchunks; |
bf481692 JA |
512 | int c, ret; |
513 | ||
9077ee4a JA |
514 | debug_init(); |
515 | ||
fa88cd09 | 516 | while ((c = getopt(argc, argv, "b:t:d:o:c:p:B:")) != -1) { |
bf481692 JA |
517 | switch (c) { |
518 | case 'b': | |
519 | blocksize = atoi(optarg); | |
520 | break; | |
521 | case 't': | |
522 | num_threads = atoi(optarg); | |
523 | break; | |
524 | case 'd': | |
525 | dump_output = atoi(optarg); | |
526 | break; | |
527 | case 'o': | |
528 | odirect = atoi(optarg); | |
529 | break; | |
530 | case 'c': | |
531 | collision_check = atoi(optarg); | |
532 | break; | |
4d53d6c0 JA |
533 | case 'p': |
534 | print_progress = atoi(optarg); | |
535 | break; | |
fa88cd09 JA |
536 | case 'B': |
537 | use_bloom = atoi(optarg); | |
538 | break; | |
bf481692 JA |
539 | case '?': |
540 | default: | |
541 | return usage(argv); | |
542 | } | |
543 | } | |
544 | ||
fa88cd09 JA |
545 | if (collision_check || dump_output) |
546 | use_bloom = 0; | |
547 | ||
bf481692 JA |
548 | if (!num_threads) |
549 | num_threads = cpus_online(); | |
550 | ||
551 | if (argc == optind) | |
552 | return usage(argv); | |
553 | ||
554 | sinit(); | |
555 | ||
556 | rb_root = RB_ROOT; | |
557 | rb_lock = fio_mutex_init(FIO_MUTEX_UNLOCKED); | |
558 | ||
fa88cd09 JA |
559 | ret = dedupe_check(argv[optind], &nextents, &nchunks); |
560 | ||
561 | if (!bloom) | |
562 | iter_rb_tree(&nextents, &nchunks); | |
bf481692 | 563 | |
fa88cd09 | 564 | show_stat(nextents, nchunks); |
bf481692 | 565 | |
1956a9e5 | 566 | fio_mutex_remove(rb_lock); |
fa88cd09 | 567 | bloom_free(bloom); |
bf481692 JA |
568 | scleanup(); |
569 | return ret; | |
570 | } |