Commit | Line | Data |
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cafe5635 KO |
1 | /* |
2 | * bcache sysfs interfaces | |
3 | * | |
4 | * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> | |
5 | * Copyright 2012 Google, Inc. | |
6 | */ | |
7 | ||
8 | #include "bcache.h" | |
9 | #include "sysfs.h" | |
10 | #include "btree.h" | |
11 | #include "request.h" | |
279afbad | 12 | #include "writeback.h" |
cafe5635 | 13 | |
c37511b8 | 14 | #include <linux/blkdev.h> |
cafe5635 KO |
15 | #include <linux/sort.h> |
16 | ||
17 | static const char * const cache_replacement_policies[] = { | |
18 | "lru", | |
19 | "fifo", | |
20 | "random", | |
21 | NULL | |
22 | }; | |
23 | ||
24 | write_attribute(attach); | |
25 | write_attribute(detach); | |
26 | write_attribute(unregister); | |
27 | write_attribute(stop); | |
28 | write_attribute(clear_stats); | |
29 | write_attribute(trigger_gc); | |
30 | write_attribute(prune_cache); | |
31 | write_attribute(flash_vol_create); | |
32 | ||
33 | read_attribute(bucket_size); | |
34 | read_attribute(block_size); | |
35 | read_attribute(nbuckets); | |
36 | read_attribute(tree_depth); | |
37 | read_attribute(root_usage_percent); | |
38 | read_attribute(priority_stats); | |
39 | read_attribute(btree_cache_size); | |
40 | read_attribute(btree_cache_max_chain); | |
41 | read_attribute(cache_available_percent); | |
42 | read_attribute(written); | |
43 | read_attribute(btree_written); | |
44 | read_attribute(metadata_written); | |
45 | read_attribute(active_journal_entries); | |
46 | ||
47 | sysfs_time_stats_attribute(btree_gc, sec, ms); | |
48 | sysfs_time_stats_attribute(btree_split, sec, us); | |
49 | sysfs_time_stats_attribute(btree_sort, ms, us); | |
50 | sysfs_time_stats_attribute(btree_read, ms, us); | |
51 | sysfs_time_stats_attribute(try_harder, ms, us); | |
52 | ||
53 | read_attribute(btree_nodes); | |
54 | read_attribute(btree_used_percent); | |
55 | read_attribute(average_key_size); | |
56 | read_attribute(dirty_data); | |
57 | read_attribute(bset_tree_stats); | |
58 | ||
59 | read_attribute(state); | |
60 | read_attribute(cache_read_races); | |
61 | read_attribute(writeback_keys_done); | |
62 | read_attribute(writeback_keys_failed); | |
63 | read_attribute(io_errors); | |
64 | read_attribute(congested); | |
65 | rw_attribute(congested_read_threshold_us); | |
66 | rw_attribute(congested_write_threshold_us); | |
67 | ||
68 | rw_attribute(sequential_cutoff); | |
69 | rw_attribute(sequential_merge); | |
70 | rw_attribute(data_csum); | |
71 | rw_attribute(cache_mode); | |
72 | rw_attribute(writeback_metadata); | |
73 | rw_attribute(writeback_running); | |
74 | rw_attribute(writeback_percent); | |
75 | rw_attribute(writeback_delay); | |
76 | rw_attribute(writeback_rate); | |
77 | ||
78 | rw_attribute(writeback_rate_update_seconds); | |
79 | rw_attribute(writeback_rate_d_term); | |
80 | rw_attribute(writeback_rate_p_term_inverse); | |
81 | rw_attribute(writeback_rate_d_smooth); | |
82 | read_attribute(writeback_rate_debug); | |
83 | ||
72c27061 KO |
84 | read_attribute(stripe_size); |
85 | read_attribute(partial_stripes_expensive); | |
86 | ||
cafe5635 KO |
87 | rw_attribute(synchronous); |
88 | rw_attribute(journal_delay_ms); | |
89 | rw_attribute(discard); | |
90 | rw_attribute(running); | |
91 | rw_attribute(label); | |
92 | rw_attribute(readahead); | |
93 | rw_attribute(io_error_limit); | |
94 | rw_attribute(io_error_halflife); | |
95 | rw_attribute(verify); | |
96 | rw_attribute(key_merging_disabled); | |
97 | rw_attribute(gc_always_rewrite); | |
98 | rw_attribute(freelist_percent); | |
99 | rw_attribute(cache_replacement_policy); | |
100 | rw_attribute(btree_shrinker_disabled); | |
101 | rw_attribute(copy_gc_enabled); | |
102 | rw_attribute(size); | |
103 | ||
104 | SHOW(__bch_cached_dev) | |
105 | { | |
106 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
107 | disk.kobj); | |
108 | const char *states[] = { "no cache", "clean", "dirty", "inconsistent" }; | |
109 | ||
110 | #define var(stat) (dc->stat) | |
111 | ||
112 | if (attr == &sysfs_cache_mode) | |
169ef1cf KO |
113 | return bch_snprint_string_list(buf, PAGE_SIZE, |
114 | bch_cache_modes + 1, | |
115 | BDEV_CACHE_MODE(&dc->sb)); | |
cafe5635 KO |
116 | |
117 | sysfs_printf(data_csum, "%i", dc->disk.data_csum); | |
118 | var_printf(verify, "%i"); | |
119 | var_printf(writeback_metadata, "%i"); | |
120 | var_printf(writeback_running, "%i"); | |
121 | var_print(writeback_delay); | |
122 | var_print(writeback_percent); | |
123 | sysfs_print(writeback_rate, dc->writeback_rate.rate); | |
124 | ||
125 | var_print(writeback_rate_update_seconds); | |
126 | var_print(writeback_rate_d_term); | |
127 | var_print(writeback_rate_p_term_inverse); | |
128 | var_print(writeback_rate_d_smooth); | |
129 | ||
130 | if (attr == &sysfs_writeback_rate_debug) { | |
131 | char dirty[20]; | |
132 | char derivative[20]; | |
133 | char target[20]; | |
169ef1cf | 134 | bch_hprint(dirty, |
279afbad | 135 | bcache_dev_sectors_dirty(&dc->disk) << 9); |
169ef1cf KO |
136 | bch_hprint(derivative, dc->writeback_rate_derivative << 9); |
137 | bch_hprint(target, dc->writeback_rate_target << 9); | |
cafe5635 KO |
138 | |
139 | return sprintf(buf, | |
140 | "rate:\t\t%u\n" | |
141 | "change:\t\t%i\n" | |
142 | "dirty:\t\t%s\n" | |
143 | "derivative:\t%s\n" | |
144 | "target:\t\t%s\n", | |
145 | dc->writeback_rate.rate, | |
146 | dc->writeback_rate_change, | |
147 | dirty, derivative, target); | |
148 | } | |
149 | ||
150 | sysfs_hprint(dirty_data, | |
279afbad | 151 | bcache_dev_sectors_dirty(&dc->disk) << 9); |
cafe5635 | 152 | |
72c27061 KO |
153 | sysfs_hprint(stripe_size, (1 << dc->disk.stripe_size_bits) << 9); |
154 | var_printf(partial_stripes_expensive, "%u"); | |
155 | ||
cafe5635 KO |
156 | var_printf(sequential_merge, "%i"); |
157 | var_hprint(sequential_cutoff); | |
158 | var_hprint(readahead); | |
159 | ||
160 | sysfs_print(running, atomic_read(&dc->running)); | |
161 | sysfs_print(state, states[BDEV_STATE(&dc->sb)]); | |
162 | ||
163 | if (attr == &sysfs_label) { | |
164 | memcpy(buf, dc->sb.label, SB_LABEL_SIZE); | |
165 | buf[SB_LABEL_SIZE + 1] = '\0'; | |
166 | strcat(buf, "\n"); | |
167 | return strlen(buf); | |
168 | } | |
169 | ||
170 | #undef var | |
171 | return 0; | |
172 | } | |
173 | SHOW_LOCKED(bch_cached_dev) | |
174 | ||
175 | STORE(__cached_dev) | |
176 | { | |
177 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
178 | disk.kobj); | |
179 | unsigned v = size; | |
180 | struct cache_set *c; | |
ab9e1400 | 181 | struct kobj_uevent_env *env; |
cafe5635 KO |
182 | |
183 | #define d_strtoul(var) sysfs_strtoul(var, dc->var) | |
184 | #define d_strtoi_h(var) sysfs_hatoi(var, dc->var) | |
185 | ||
186 | sysfs_strtoul(data_csum, dc->disk.data_csum); | |
187 | d_strtoul(verify); | |
188 | d_strtoul(writeback_metadata); | |
189 | d_strtoul(writeback_running); | |
190 | d_strtoul(writeback_delay); | |
191 | sysfs_strtoul_clamp(writeback_rate, | |
192 | dc->writeback_rate.rate, 1, 1000000); | |
193 | sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40); | |
194 | ||
195 | d_strtoul(writeback_rate_update_seconds); | |
196 | d_strtoul(writeback_rate_d_term); | |
197 | d_strtoul(writeback_rate_p_term_inverse); | |
198 | sysfs_strtoul_clamp(writeback_rate_p_term_inverse, | |
199 | dc->writeback_rate_p_term_inverse, 1, INT_MAX); | |
200 | d_strtoul(writeback_rate_d_smooth); | |
201 | ||
202 | d_strtoul(sequential_merge); | |
203 | d_strtoi_h(sequential_cutoff); | |
204 | d_strtoi_h(readahead); | |
205 | ||
206 | if (attr == &sysfs_clear_stats) | |
207 | bch_cache_accounting_clear(&dc->accounting); | |
208 | ||
209 | if (attr == &sysfs_running && | |
210 | strtoul_or_return(buf)) | |
211 | bch_cached_dev_run(dc); | |
212 | ||
213 | if (attr == &sysfs_cache_mode) { | |
169ef1cf | 214 | ssize_t v = bch_read_string_list(buf, bch_cache_modes + 1); |
cafe5635 KO |
215 | |
216 | if (v < 0) | |
217 | return v; | |
218 | ||
219 | if ((unsigned) v != BDEV_CACHE_MODE(&dc->sb)) { | |
220 | SET_BDEV_CACHE_MODE(&dc->sb, v); | |
221 | bch_write_bdev_super(dc, NULL); | |
222 | } | |
223 | } | |
224 | ||
225 | if (attr == &sysfs_label) { | |
ab9e1400 | 226 | /* note: endlines are preserved */ |
cafe5635 KO |
227 | memcpy(dc->sb.label, buf, SB_LABEL_SIZE); |
228 | bch_write_bdev_super(dc, NULL); | |
229 | if (dc->disk.c) { | |
230 | memcpy(dc->disk.c->uuids[dc->disk.id].label, | |
231 | buf, SB_LABEL_SIZE); | |
232 | bch_uuid_write(dc->disk.c); | |
233 | } | |
ab9e1400 | 234 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
d2a65ce2 DC |
235 | if (!env) |
236 | return -ENOMEM; | |
ab9e1400 GP |
237 | add_uevent_var(env, "DRIVER=bcache"); |
238 | add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid), | |
239 | add_uevent_var(env, "CACHED_LABEL=%s", buf); | |
240 | kobject_uevent_env( | |
241 | &disk_to_dev(dc->disk.disk)->kobj, KOBJ_CHANGE, env->envp); | |
242 | kfree(env); | |
cafe5635 KO |
243 | } |
244 | ||
245 | if (attr == &sysfs_attach) { | |
169ef1cf | 246 | if (bch_parse_uuid(buf, dc->sb.set_uuid) < 16) |
cafe5635 KO |
247 | return -EINVAL; |
248 | ||
249 | list_for_each_entry(c, &bch_cache_sets, list) { | |
250 | v = bch_cached_dev_attach(dc, c); | |
251 | if (!v) | |
252 | return size; | |
253 | } | |
254 | ||
255 | pr_err("Can't attach %s: cache set not found", buf); | |
256 | size = v; | |
257 | } | |
258 | ||
259 | if (attr == &sysfs_detach && dc->disk.c) | |
260 | bch_cached_dev_detach(dc); | |
261 | ||
262 | if (attr == &sysfs_stop) | |
263 | bcache_device_stop(&dc->disk); | |
264 | ||
265 | return size; | |
266 | } | |
267 | ||
268 | STORE(bch_cached_dev) | |
269 | { | |
270 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
271 | disk.kobj); | |
272 | ||
273 | mutex_lock(&bch_register_lock); | |
274 | size = __cached_dev_store(kobj, attr, buf, size); | |
275 | ||
276 | if (attr == &sysfs_writeback_running) | |
277 | bch_writeback_queue(dc); | |
278 | ||
279 | if (attr == &sysfs_writeback_percent) | |
280 | schedule_delayed_work(&dc->writeback_rate_update, | |
281 | dc->writeback_rate_update_seconds * HZ); | |
282 | ||
283 | mutex_unlock(&bch_register_lock); | |
284 | return size; | |
285 | } | |
286 | ||
287 | static struct attribute *bch_cached_dev_files[] = { | |
288 | &sysfs_attach, | |
289 | &sysfs_detach, | |
290 | &sysfs_stop, | |
291 | #if 0 | |
292 | &sysfs_data_csum, | |
293 | #endif | |
294 | &sysfs_cache_mode, | |
295 | &sysfs_writeback_metadata, | |
296 | &sysfs_writeback_running, | |
297 | &sysfs_writeback_delay, | |
298 | &sysfs_writeback_percent, | |
299 | &sysfs_writeback_rate, | |
300 | &sysfs_writeback_rate_update_seconds, | |
301 | &sysfs_writeback_rate_d_term, | |
302 | &sysfs_writeback_rate_p_term_inverse, | |
303 | &sysfs_writeback_rate_d_smooth, | |
304 | &sysfs_writeback_rate_debug, | |
305 | &sysfs_dirty_data, | |
72c27061 KO |
306 | &sysfs_stripe_size, |
307 | &sysfs_partial_stripes_expensive, | |
cafe5635 KO |
308 | &sysfs_sequential_cutoff, |
309 | &sysfs_sequential_merge, | |
310 | &sysfs_clear_stats, | |
311 | &sysfs_running, | |
312 | &sysfs_state, | |
313 | &sysfs_label, | |
314 | &sysfs_readahead, | |
315 | #ifdef CONFIG_BCACHE_DEBUG | |
316 | &sysfs_verify, | |
317 | #endif | |
318 | NULL | |
319 | }; | |
320 | KTYPE(bch_cached_dev); | |
321 | ||
322 | SHOW(bch_flash_dev) | |
323 | { | |
324 | struct bcache_device *d = container_of(kobj, struct bcache_device, | |
325 | kobj); | |
326 | struct uuid_entry *u = &d->c->uuids[d->id]; | |
327 | ||
328 | sysfs_printf(data_csum, "%i", d->data_csum); | |
329 | sysfs_hprint(size, u->sectors << 9); | |
330 | ||
331 | if (attr == &sysfs_label) { | |
332 | memcpy(buf, u->label, SB_LABEL_SIZE); | |
333 | buf[SB_LABEL_SIZE + 1] = '\0'; | |
334 | strcat(buf, "\n"); | |
335 | return strlen(buf); | |
336 | } | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | STORE(__bch_flash_dev) | |
342 | { | |
343 | struct bcache_device *d = container_of(kobj, struct bcache_device, | |
344 | kobj); | |
345 | struct uuid_entry *u = &d->c->uuids[d->id]; | |
346 | ||
347 | sysfs_strtoul(data_csum, d->data_csum); | |
348 | ||
349 | if (attr == &sysfs_size) { | |
350 | uint64_t v; | |
351 | strtoi_h_or_return(buf, v); | |
352 | ||
353 | u->sectors = v >> 9; | |
354 | bch_uuid_write(d->c); | |
355 | set_capacity(d->disk, u->sectors); | |
356 | } | |
357 | ||
358 | if (attr == &sysfs_label) { | |
359 | memcpy(u->label, buf, SB_LABEL_SIZE); | |
360 | bch_uuid_write(d->c); | |
361 | } | |
362 | ||
363 | if (attr == &sysfs_unregister) { | |
364 | atomic_set(&d->detaching, 1); | |
365 | bcache_device_stop(d); | |
366 | } | |
367 | ||
368 | return size; | |
369 | } | |
370 | STORE_LOCKED(bch_flash_dev) | |
371 | ||
372 | static struct attribute *bch_flash_dev_files[] = { | |
373 | &sysfs_unregister, | |
374 | #if 0 | |
375 | &sysfs_data_csum, | |
376 | #endif | |
377 | &sysfs_label, | |
378 | &sysfs_size, | |
379 | NULL | |
380 | }; | |
381 | KTYPE(bch_flash_dev); | |
382 | ||
383 | SHOW(__bch_cache_set) | |
384 | { | |
385 | unsigned root_usage(struct cache_set *c) | |
386 | { | |
387 | unsigned bytes = 0; | |
388 | struct bkey *k; | |
389 | struct btree *b; | |
390 | struct btree_iter iter; | |
391 | ||
392 | goto lock_root; | |
393 | ||
394 | do { | |
395 | rw_unlock(false, b); | |
396 | lock_root: | |
397 | b = c->root; | |
398 | rw_lock(false, b, b->level); | |
399 | } while (b != c->root); | |
400 | ||
401 | for_each_key_filter(b, k, &iter, bch_ptr_bad) | |
402 | bytes += bkey_bytes(k); | |
403 | ||
404 | rw_unlock(false, b); | |
405 | ||
406 | return (bytes * 100) / btree_bytes(c); | |
407 | } | |
408 | ||
409 | size_t cache_size(struct cache_set *c) | |
410 | { | |
411 | size_t ret = 0; | |
412 | struct btree *b; | |
413 | ||
414 | mutex_lock(&c->bucket_lock); | |
415 | list_for_each_entry(b, &c->btree_cache, list) | |
416 | ret += 1 << (b->page_order + PAGE_SHIFT); | |
417 | ||
418 | mutex_unlock(&c->bucket_lock); | |
419 | return ret; | |
420 | } | |
421 | ||
422 | unsigned cache_max_chain(struct cache_set *c) | |
423 | { | |
424 | unsigned ret = 0; | |
425 | struct hlist_head *h; | |
426 | ||
427 | mutex_lock(&c->bucket_lock); | |
428 | ||
429 | for (h = c->bucket_hash; | |
430 | h < c->bucket_hash + (1 << BUCKET_HASH_BITS); | |
431 | h++) { | |
432 | unsigned i = 0; | |
433 | struct hlist_node *p; | |
434 | ||
435 | hlist_for_each(p, h) | |
436 | i++; | |
437 | ||
438 | ret = max(ret, i); | |
439 | } | |
440 | ||
441 | mutex_unlock(&c->bucket_lock); | |
442 | return ret; | |
443 | } | |
444 | ||
445 | unsigned btree_used(struct cache_set *c) | |
446 | { | |
447 | return div64_u64(c->gc_stats.key_bytes * 100, | |
448 | (c->gc_stats.nodes ?: 1) * btree_bytes(c)); | |
449 | } | |
450 | ||
451 | unsigned average_key_size(struct cache_set *c) | |
452 | { | |
453 | return c->gc_stats.nkeys | |
454 | ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) | |
455 | : 0; | |
456 | } | |
457 | ||
458 | struct cache_set *c = container_of(kobj, struct cache_set, kobj); | |
459 | ||
460 | sysfs_print(synchronous, CACHE_SYNC(&c->sb)); | |
461 | sysfs_print(journal_delay_ms, c->journal_delay_ms); | |
462 | sysfs_hprint(bucket_size, bucket_bytes(c)); | |
463 | sysfs_hprint(block_size, block_bytes(c)); | |
464 | sysfs_print(tree_depth, c->root->level); | |
465 | sysfs_print(root_usage_percent, root_usage(c)); | |
466 | ||
467 | sysfs_hprint(btree_cache_size, cache_size(c)); | |
468 | sysfs_print(btree_cache_max_chain, cache_max_chain(c)); | |
469 | sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use); | |
470 | ||
471 | sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms); | |
472 | sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us); | |
473 | sysfs_print_time_stats(&c->sort_time, btree_sort, ms, us); | |
474 | sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); | |
475 | sysfs_print_time_stats(&c->try_harder_time, try_harder, ms, us); | |
476 | ||
477 | sysfs_print(btree_used_percent, btree_used(c)); | |
478 | sysfs_print(btree_nodes, c->gc_stats.nodes); | |
479 | sysfs_hprint(dirty_data, c->gc_stats.dirty); | |
480 | sysfs_hprint(average_key_size, average_key_size(c)); | |
481 | ||
482 | sysfs_print(cache_read_races, | |
483 | atomic_long_read(&c->cache_read_races)); | |
484 | ||
485 | sysfs_print(writeback_keys_done, | |
486 | atomic_long_read(&c->writeback_keys_done)); | |
487 | sysfs_print(writeback_keys_failed, | |
488 | atomic_long_read(&c->writeback_keys_failed)); | |
489 | ||
490 | /* See count_io_errors for why 88 */ | |
491 | sysfs_print(io_error_halflife, c->error_decay * 88); | |
492 | sysfs_print(io_error_limit, c->error_limit >> IO_ERROR_SHIFT); | |
493 | ||
494 | sysfs_hprint(congested, | |
495 | ((uint64_t) bch_get_congested(c)) << 9); | |
496 | sysfs_print(congested_read_threshold_us, | |
497 | c->congested_read_threshold_us); | |
498 | sysfs_print(congested_write_threshold_us, | |
499 | c->congested_write_threshold_us); | |
500 | ||
501 | sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); | |
502 | sysfs_printf(verify, "%i", c->verify); | |
503 | sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); | |
504 | sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); | |
505 | sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); | |
506 | sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); | |
507 | ||
508 | if (attr == &sysfs_bset_tree_stats) | |
509 | return bch_bset_print_stats(c, buf); | |
510 | ||
511 | return 0; | |
512 | } | |
513 | SHOW_LOCKED(bch_cache_set) | |
514 | ||
515 | STORE(__bch_cache_set) | |
516 | { | |
517 | struct cache_set *c = container_of(kobj, struct cache_set, kobj); | |
518 | ||
519 | if (attr == &sysfs_unregister) | |
520 | bch_cache_set_unregister(c); | |
521 | ||
522 | if (attr == &sysfs_stop) | |
523 | bch_cache_set_stop(c); | |
524 | ||
525 | if (attr == &sysfs_synchronous) { | |
526 | bool sync = strtoul_or_return(buf); | |
527 | ||
528 | if (sync != CACHE_SYNC(&c->sb)) { | |
529 | SET_CACHE_SYNC(&c->sb, sync); | |
530 | bcache_write_super(c); | |
531 | } | |
532 | } | |
533 | ||
534 | if (attr == &sysfs_flash_vol_create) { | |
535 | int r; | |
536 | uint64_t v; | |
537 | strtoi_h_or_return(buf, v); | |
538 | ||
539 | r = bch_flash_dev_create(c, v); | |
540 | if (r) | |
541 | return r; | |
542 | } | |
543 | ||
544 | if (attr == &sysfs_clear_stats) { | |
545 | atomic_long_set(&c->writeback_keys_done, 0); | |
546 | atomic_long_set(&c->writeback_keys_failed, 0); | |
547 | ||
548 | memset(&c->gc_stats, 0, sizeof(struct gc_stat)); | |
549 | bch_cache_accounting_clear(&c->accounting); | |
550 | } | |
551 | ||
552 | if (attr == &sysfs_trigger_gc) | |
553 | bch_queue_gc(c); | |
554 | ||
555 | if (attr == &sysfs_prune_cache) { | |
556 | struct shrink_control sc; | |
557 | sc.gfp_mask = GFP_KERNEL; | |
558 | sc.nr_to_scan = strtoul_or_return(buf); | |
559 | c->shrink.shrink(&c->shrink, &sc); | |
560 | } | |
561 | ||
562 | sysfs_strtoul(congested_read_threshold_us, | |
563 | c->congested_read_threshold_us); | |
564 | sysfs_strtoul(congested_write_threshold_us, | |
565 | c->congested_write_threshold_us); | |
566 | ||
567 | if (attr == &sysfs_io_error_limit) | |
568 | c->error_limit = strtoul_or_return(buf) << IO_ERROR_SHIFT; | |
569 | ||
570 | /* See count_io_errors() for why 88 */ | |
571 | if (attr == &sysfs_io_error_halflife) | |
572 | c->error_decay = strtoul_or_return(buf) / 88; | |
573 | ||
574 | sysfs_strtoul(journal_delay_ms, c->journal_delay_ms); | |
575 | sysfs_strtoul(verify, c->verify); | |
576 | sysfs_strtoul(key_merging_disabled, c->key_merging_disabled); | |
577 | sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite); | |
578 | sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled); | |
579 | sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled); | |
580 | ||
581 | return size; | |
582 | } | |
583 | STORE_LOCKED(bch_cache_set) | |
584 | ||
585 | SHOW(bch_cache_set_internal) | |
586 | { | |
587 | struct cache_set *c = container_of(kobj, struct cache_set, internal); | |
588 | return bch_cache_set_show(&c->kobj, attr, buf); | |
589 | } | |
590 | ||
591 | STORE(bch_cache_set_internal) | |
592 | { | |
593 | struct cache_set *c = container_of(kobj, struct cache_set, internal); | |
594 | return bch_cache_set_store(&c->kobj, attr, buf, size); | |
595 | } | |
596 | ||
597 | static void bch_cache_set_internal_release(struct kobject *k) | |
598 | { | |
599 | } | |
600 | ||
601 | static struct attribute *bch_cache_set_files[] = { | |
602 | &sysfs_unregister, | |
603 | &sysfs_stop, | |
604 | &sysfs_synchronous, | |
605 | &sysfs_journal_delay_ms, | |
606 | &sysfs_flash_vol_create, | |
607 | ||
608 | &sysfs_bucket_size, | |
609 | &sysfs_block_size, | |
610 | &sysfs_tree_depth, | |
611 | &sysfs_root_usage_percent, | |
612 | &sysfs_btree_cache_size, | |
613 | &sysfs_cache_available_percent, | |
614 | ||
615 | &sysfs_average_key_size, | |
616 | &sysfs_dirty_data, | |
617 | ||
618 | &sysfs_io_error_limit, | |
619 | &sysfs_io_error_halflife, | |
620 | &sysfs_congested, | |
621 | &sysfs_congested_read_threshold_us, | |
622 | &sysfs_congested_write_threshold_us, | |
623 | &sysfs_clear_stats, | |
624 | NULL | |
625 | }; | |
626 | KTYPE(bch_cache_set); | |
627 | ||
628 | static struct attribute *bch_cache_set_internal_files[] = { | |
629 | &sysfs_active_journal_entries, | |
630 | ||
631 | sysfs_time_stats_attribute_list(btree_gc, sec, ms) | |
632 | sysfs_time_stats_attribute_list(btree_split, sec, us) | |
633 | sysfs_time_stats_attribute_list(btree_sort, ms, us) | |
634 | sysfs_time_stats_attribute_list(btree_read, ms, us) | |
635 | sysfs_time_stats_attribute_list(try_harder, ms, us) | |
636 | ||
637 | &sysfs_btree_nodes, | |
638 | &sysfs_btree_used_percent, | |
639 | &sysfs_btree_cache_max_chain, | |
640 | ||
641 | &sysfs_bset_tree_stats, | |
642 | &sysfs_cache_read_races, | |
643 | &sysfs_writeback_keys_done, | |
644 | &sysfs_writeback_keys_failed, | |
645 | ||
646 | &sysfs_trigger_gc, | |
647 | &sysfs_prune_cache, | |
648 | #ifdef CONFIG_BCACHE_DEBUG | |
649 | &sysfs_verify, | |
650 | &sysfs_key_merging_disabled, | |
651 | #endif | |
652 | &sysfs_gc_always_rewrite, | |
653 | &sysfs_btree_shrinker_disabled, | |
654 | &sysfs_copy_gc_enabled, | |
655 | NULL | |
656 | }; | |
657 | KTYPE(bch_cache_set_internal); | |
658 | ||
659 | SHOW(__bch_cache) | |
660 | { | |
661 | struct cache *ca = container_of(kobj, struct cache, kobj); | |
662 | ||
663 | sysfs_hprint(bucket_size, bucket_bytes(ca)); | |
664 | sysfs_hprint(block_size, block_bytes(ca)); | |
665 | sysfs_print(nbuckets, ca->sb.nbuckets); | |
666 | sysfs_print(discard, ca->discard); | |
667 | sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); | |
668 | sysfs_hprint(btree_written, | |
669 | atomic_long_read(&ca->btree_sectors_written) << 9); | |
670 | sysfs_hprint(metadata_written, | |
671 | (atomic_long_read(&ca->meta_sectors_written) + | |
672 | atomic_long_read(&ca->btree_sectors_written)) << 9); | |
673 | ||
674 | sysfs_print(io_errors, | |
675 | atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); | |
676 | ||
677 | sysfs_print(freelist_percent, ca->free.size * 100 / | |
678 | ((size_t) ca->sb.nbuckets)); | |
679 | ||
680 | if (attr == &sysfs_cache_replacement_policy) | |
169ef1cf KO |
681 | return bch_snprint_string_list(buf, PAGE_SIZE, |
682 | cache_replacement_policies, | |
683 | CACHE_REPLACEMENT(&ca->sb)); | |
cafe5635 KO |
684 | |
685 | if (attr == &sysfs_priority_stats) { | |
686 | int cmp(const void *l, const void *r) | |
687 | { return *((uint16_t *) r) - *((uint16_t *) l); } | |
688 | ||
cafe5635 KO |
689 | size_t n = ca->sb.nbuckets, i, unused, btree; |
690 | uint64_t sum = 0; | |
bbc77aa7 KO |
691 | /* Compute 31 quantiles */ |
692 | uint16_t q[31], *p, *cached; | |
cafe5635 KO |
693 | ssize_t ret; |
694 | ||
695 | cached = p = vmalloc(ca->sb.nbuckets * sizeof(uint16_t)); | |
696 | if (!p) | |
697 | return -ENOMEM; | |
698 | ||
699 | mutex_lock(&ca->set->bucket_lock); | |
700 | for (i = ca->sb.first_bucket; i < n; i++) | |
701 | p[i] = ca->buckets[i].prio; | |
702 | mutex_unlock(&ca->set->bucket_lock); | |
703 | ||
704 | sort(p, n, sizeof(uint16_t), cmp, NULL); | |
705 | ||
706 | while (n && | |
707 | !cached[n - 1]) | |
708 | --n; | |
709 | ||
710 | unused = ca->sb.nbuckets - n; | |
711 | ||
712 | while (cached < p + n && | |
713 | *cached == BTREE_PRIO) | |
714 | cached++; | |
715 | ||
716 | btree = cached - p; | |
717 | n -= btree; | |
718 | ||
719 | for (i = 0; i < n; i++) | |
720 | sum += INITIAL_PRIO - cached[i]; | |
721 | ||
722 | if (n) | |
723 | do_div(sum, n); | |
724 | ||
bbc77aa7 KO |
725 | for (i = 0; i < ARRAY_SIZE(q); i++) |
726 | q[i] = INITIAL_PRIO - cached[n * (i + 1) / | |
727 | (ARRAY_SIZE(q) + 1)]; | |
cafe5635 KO |
728 | |
729 | vfree(p); | |
730 | ||
bbc77aa7 KO |
731 | ret = scnprintf(buf, PAGE_SIZE, |
732 | "Unused: %zu%%\n" | |
733 | "Metadata: %zu%%\n" | |
734 | "Average: %llu\n" | |
735 | "Sectors per Q: %zu\n" | |
736 | "Quantiles: [", | |
737 | unused * 100 / (size_t) ca->sb.nbuckets, | |
738 | btree * 100 / (size_t) ca->sb.nbuckets, sum, | |
739 | n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1)); | |
740 | ||
741 | for (i = 0; i < ARRAY_SIZE(q); i++) | |
742 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, | |
743 | "%u ", q[i]); | |
744 | ret--; | |
745 | ||
746 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); | |
747 | ||
cafe5635 KO |
748 | return ret; |
749 | } | |
750 | ||
751 | return 0; | |
752 | } | |
753 | SHOW_LOCKED(bch_cache) | |
754 | ||
755 | STORE(__bch_cache) | |
756 | { | |
757 | struct cache *ca = container_of(kobj, struct cache, kobj); | |
758 | ||
759 | if (attr == &sysfs_discard) { | |
760 | bool v = strtoul_or_return(buf); | |
761 | ||
762 | if (blk_queue_discard(bdev_get_queue(ca->bdev))) | |
763 | ca->discard = v; | |
764 | ||
765 | if (v != CACHE_DISCARD(&ca->sb)) { | |
766 | SET_CACHE_DISCARD(&ca->sb, v); | |
767 | bcache_write_super(ca->set); | |
768 | } | |
769 | } | |
770 | ||
771 | if (attr == &sysfs_cache_replacement_policy) { | |
169ef1cf | 772 | ssize_t v = bch_read_string_list(buf, cache_replacement_policies); |
cafe5635 KO |
773 | |
774 | if (v < 0) | |
775 | return v; | |
776 | ||
777 | if ((unsigned) v != CACHE_REPLACEMENT(&ca->sb)) { | |
778 | mutex_lock(&ca->set->bucket_lock); | |
779 | SET_CACHE_REPLACEMENT(&ca->sb, v); | |
780 | mutex_unlock(&ca->set->bucket_lock); | |
781 | ||
782 | bcache_write_super(ca->set); | |
783 | } | |
784 | } | |
785 | ||
786 | if (attr == &sysfs_freelist_percent) { | |
787 | DECLARE_FIFO(long, free); | |
788 | long i; | |
789 | size_t p = strtoul_or_return(buf); | |
790 | ||
791 | p = clamp_t(size_t, | |
792 | ((size_t) ca->sb.nbuckets * p) / 100, | |
793 | roundup_pow_of_two(ca->sb.nbuckets) >> 9, | |
794 | ca->sb.nbuckets / 2); | |
795 | ||
796 | if (!init_fifo_exact(&free, p, GFP_KERNEL)) | |
797 | return -ENOMEM; | |
798 | ||
799 | mutex_lock(&ca->set->bucket_lock); | |
800 | ||
801 | fifo_move(&free, &ca->free); | |
802 | fifo_swap(&free, &ca->free); | |
803 | ||
804 | mutex_unlock(&ca->set->bucket_lock); | |
805 | ||
806 | while (fifo_pop(&free, i)) | |
807 | atomic_dec(&ca->buckets[i].pin); | |
808 | ||
809 | free_fifo(&free); | |
810 | } | |
811 | ||
812 | if (attr == &sysfs_clear_stats) { | |
813 | atomic_long_set(&ca->sectors_written, 0); | |
814 | atomic_long_set(&ca->btree_sectors_written, 0); | |
815 | atomic_long_set(&ca->meta_sectors_written, 0); | |
816 | atomic_set(&ca->io_count, 0); | |
817 | atomic_set(&ca->io_errors, 0); | |
818 | } | |
819 | ||
820 | return size; | |
821 | } | |
822 | STORE_LOCKED(bch_cache) | |
823 | ||
824 | static struct attribute *bch_cache_files[] = { | |
825 | &sysfs_bucket_size, | |
826 | &sysfs_block_size, | |
827 | &sysfs_nbuckets, | |
828 | &sysfs_priority_stats, | |
829 | &sysfs_discard, | |
830 | &sysfs_written, | |
831 | &sysfs_btree_written, | |
832 | &sysfs_metadata_written, | |
833 | &sysfs_io_errors, | |
834 | &sysfs_clear_stats, | |
835 | &sysfs_freelist_percent, | |
836 | &sysfs_cache_replacement_policy, | |
837 | NULL | |
838 | }; | |
839 | KTYPE(bch_cache); |