Commit | Line | Data |
---|---|---|
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 | ||
77c320eb KO |
24 | static const char * const error_actions[] = { |
25 | "unregister", | |
26 | "panic", | |
27 | NULL | |
28 | }; | |
29 | ||
cafe5635 KO |
30 | write_attribute(attach); |
31 | write_attribute(detach); | |
32 | write_attribute(unregister); | |
33 | write_attribute(stop); | |
34 | write_attribute(clear_stats); | |
35 | write_attribute(trigger_gc); | |
36 | write_attribute(prune_cache); | |
37 | write_attribute(flash_vol_create); | |
38 | ||
39 | read_attribute(bucket_size); | |
40 | read_attribute(block_size); | |
41 | read_attribute(nbuckets); | |
42 | read_attribute(tree_depth); | |
43 | read_attribute(root_usage_percent); | |
44 | read_attribute(priority_stats); | |
45 | read_attribute(btree_cache_size); | |
46 | read_attribute(btree_cache_max_chain); | |
47 | read_attribute(cache_available_percent); | |
48 | read_attribute(written); | |
49 | read_attribute(btree_written); | |
50 | read_attribute(metadata_written); | |
51 | read_attribute(active_journal_entries); | |
52 | ||
53 | sysfs_time_stats_attribute(btree_gc, sec, ms); | |
54 | sysfs_time_stats_attribute(btree_split, sec, us); | |
55 | sysfs_time_stats_attribute(btree_sort, ms, us); | |
56 | sysfs_time_stats_attribute(btree_read, ms, us); | |
57 | sysfs_time_stats_attribute(try_harder, ms, us); | |
58 | ||
59 | read_attribute(btree_nodes); | |
60 | read_attribute(btree_used_percent); | |
61 | read_attribute(average_key_size); | |
62 | read_attribute(dirty_data); | |
63 | read_attribute(bset_tree_stats); | |
64 | ||
65 | read_attribute(state); | |
66 | read_attribute(cache_read_races); | |
67 | read_attribute(writeback_keys_done); | |
68 | read_attribute(writeback_keys_failed); | |
69 | read_attribute(io_errors); | |
70 | read_attribute(congested); | |
71 | rw_attribute(congested_read_threshold_us); | |
72 | rw_attribute(congested_write_threshold_us); | |
73 | ||
74 | rw_attribute(sequential_cutoff); | |
cafe5635 KO |
75 | rw_attribute(data_csum); |
76 | rw_attribute(cache_mode); | |
77 | rw_attribute(writeback_metadata); | |
78 | rw_attribute(writeback_running); | |
79 | rw_attribute(writeback_percent); | |
80 | rw_attribute(writeback_delay); | |
81 | rw_attribute(writeback_rate); | |
82 | ||
83 | rw_attribute(writeback_rate_update_seconds); | |
84 | rw_attribute(writeback_rate_d_term); | |
85 | rw_attribute(writeback_rate_p_term_inverse); | |
86 | rw_attribute(writeback_rate_d_smooth); | |
87 | read_attribute(writeback_rate_debug); | |
88 | ||
72c27061 KO |
89 | read_attribute(stripe_size); |
90 | read_attribute(partial_stripes_expensive); | |
91 | ||
cafe5635 KO |
92 | rw_attribute(synchronous); |
93 | rw_attribute(journal_delay_ms); | |
94 | rw_attribute(discard); | |
95 | rw_attribute(running); | |
96 | rw_attribute(label); | |
97 | rw_attribute(readahead); | |
77c320eb | 98 | rw_attribute(errors); |
cafe5635 KO |
99 | rw_attribute(io_error_limit); |
100 | rw_attribute(io_error_halflife); | |
101 | rw_attribute(verify); | |
5ceaaad7 | 102 | rw_attribute(bypass_torture_test); |
cafe5635 KO |
103 | rw_attribute(key_merging_disabled); |
104 | rw_attribute(gc_always_rewrite); | |
280481d0 | 105 | rw_attribute(expensive_debug_checks); |
cafe5635 KO |
106 | rw_attribute(freelist_percent); |
107 | rw_attribute(cache_replacement_policy); | |
108 | rw_attribute(btree_shrinker_disabled); | |
109 | rw_attribute(copy_gc_enabled); | |
110 | rw_attribute(size); | |
111 | ||
112 | SHOW(__bch_cached_dev) | |
113 | { | |
114 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
115 | disk.kobj); | |
116 | const char *states[] = { "no cache", "clean", "dirty", "inconsistent" }; | |
117 | ||
118 | #define var(stat) (dc->stat) | |
119 | ||
120 | if (attr == &sysfs_cache_mode) | |
169ef1cf KO |
121 | return bch_snprint_string_list(buf, PAGE_SIZE, |
122 | bch_cache_modes + 1, | |
123 | BDEV_CACHE_MODE(&dc->sb)); | |
cafe5635 KO |
124 | |
125 | sysfs_printf(data_csum, "%i", dc->disk.data_csum); | |
126 | var_printf(verify, "%i"); | |
5ceaaad7 | 127 | var_printf(bypass_torture_test, "%i"); |
cafe5635 KO |
128 | var_printf(writeback_metadata, "%i"); |
129 | var_printf(writeback_running, "%i"); | |
130 | var_print(writeback_delay); | |
131 | var_print(writeback_percent); | |
132 | sysfs_print(writeback_rate, dc->writeback_rate.rate); | |
133 | ||
134 | var_print(writeback_rate_update_seconds); | |
135 | var_print(writeback_rate_d_term); | |
136 | var_print(writeback_rate_p_term_inverse); | |
137 | var_print(writeback_rate_d_smooth); | |
138 | ||
139 | if (attr == &sysfs_writeback_rate_debug) { | |
140 | char dirty[20]; | |
141 | char derivative[20]; | |
142 | char target[20]; | |
169ef1cf | 143 | bch_hprint(dirty, |
279afbad | 144 | bcache_dev_sectors_dirty(&dc->disk) << 9); |
169ef1cf KO |
145 | bch_hprint(derivative, dc->writeback_rate_derivative << 9); |
146 | bch_hprint(target, dc->writeback_rate_target << 9); | |
cafe5635 KO |
147 | |
148 | return sprintf(buf, | |
149 | "rate:\t\t%u\n" | |
150 | "change:\t\t%i\n" | |
151 | "dirty:\t\t%s\n" | |
152 | "derivative:\t%s\n" | |
153 | "target:\t\t%s\n", | |
154 | dc->writeback_rate.rate, | |
155 | dc->writeback_rate_change, | |
156 | dirty, derivative, target); | |
157 | } | |
158 | ||
159 | sysfs_hprint(dirty_data, | |
279afbad | 160 | bcache_dev_sectors_dirty(&dc->disk) << 9); |
cafe5635 | 161 | |
2d679fc7 | 162 | sysfs_hprint(stripe_size, dc->disk.stripe_size << 9); |
72c27061 KO |
163 | var_printf(partial_stripes_expensive, "%u"); |
164 | ||
cafe5635 KO |
165 | var_hprint(sequential_cutoff); |
166 | var_hprint(readahead); | |
167 | ||
168 | sysfs_print(running, atomic_read(&dc->running)); | |
169 | sysfs_print(state, states[BDEV_STATE(&dc->sb)]); | |
170 | ||
171 | if (attr == &sysfs_label) { | |
172 | memcpy(buf, dc->sb.label, SB_LABEL_SIZE); | |
173 | buf[SB_LABEL_SIZE + 1] = '\0'; | |
174 | strcat(buf, "\n"); | |
175 | return strlen(buf); | |
176 | } | |
177 | ||
178 | #undef var | |
179 | return 0; | |
180 | } | |
181 | SHOW_LOCKED(bch_cached_dev) | |
182 | ||
183 | STORE(__cached_dev) | |
184 | { | |
185 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
186 | disk.kobj); | |
187 | unsigned v = size; | |
188 | struct cache_set *c; | |
ab9e1400 | 189 | struct kobj_uevent_env *env; |
cafe5635 KO |
190 | |
191 | #define d_strtoul(var) sysfs_strtoul(var, dc->var) | |
192 | #define d_strtoi_h(var) sysfs_hatoi(var, dc->var) | |
193 | ||
194 | sysfs_strtoul(data_csum, dc->disk.data_csum); | |
195 | d_strtoul(verify); | |
5ceaaad7 | 196 | d_strtoul(bypass_torture_test); |
cafe5635 KO |
197 | d_strtoul(writeback_metadata); |
198 | d_strtoul(writeback_running); | |
199 | d_strtoul(writeback_delay); | |
200 | sysfs_strtoul_clamp(writeback_rate, | |
201 | dc->writeback_rate.rate, 1, 1000000); | |
202 | sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40); | |
203 | ||
204 | d_strtoul(writeback_rate_update_seconds); | |
205 | d_strtoul(writeback_rate_d_term); | |
206 | d_strtoul(writeback_rate_p_term_inverse); | |
207 | sysfs_strtoul_clamp(writeback_rate_p_term_inverse, | |
208 | dc->writeback_rate_p_term_inverse, 1, INT_MAX); | |
209 | d_strtoul(writeback_rate_d_smooth); | |
210 | ||
cafe5635 KO |
211 | d_strtoi_h(sequential_cutoff); |
212 | d_strtoi_h(readahead); | |
213 | ||
214 | if (attr == &sysfs_clear_stats) | |
215 | bch_cache_accounting_clear(&dc->accounting); | |
216 | ||
217 | if (attr == &sysfs_running && | |
218 | strtoul_or_return(buf)) | |
219 | bch_cached_dev_run(dc); | |
220 | ||
221 | if (attr == &sysfs_cache_mode) { | |
169ef1cf | 222 | ssize_t v = bch_read_string_list(buf, bch_cache_modes + 1); |
cafe5635 KO |
223 | |
224 | if (v < 0) | |
225 | return v; | |
226 | ||
227 | if ((unsigned) v != BDEV_CACHE_MODE(&dc->sb)) { | |
228 | SET_BDEV_CACHE_MODE(&dc->sb, v); | |
229 | bch_write_bdev_super(dc, NULL); | |
230 | } | |
231 | } | |
232 | ||
233 | if (attr == &sysfs_label) { | |
aee6f1cf GP |
234 | if (size > SB_LABEL_SIZE) |
235 | return -EINVAL; | |
236 | memcpy(dc->sb.label, buf, size); | |
237 | if (size < SB_LABEL_SIZE) | |
238 | dc->sb.label[size] = '\0'; | |
239 | if (size && dc->sb.label[size - 1] == '\n') | |
240 | dc->sb.label[size - 1] = '\0'; | |
cafe5635 KO |
241 | bch_write_bdev_super(dc, NULL); |
242 | if (dc->disk.c) { | |
243 | memcpy(dc->disk.c->uuids[dc->disk.id].label, | |
244 | buf, SB_LABEL_SIZE); | |
245 | bch_uuid_write(dc->disk.c); | |
246 | } | |
ab9e1400 | 247 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
d2a65ce2 DC |
248 | if (!env) |
249 | return -ENOMEM; | |
ab9e1400 GP |
250 | add_uevent_var(env, "DRIVER=bcache"); |
251 | add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid), | |
252 | add_uevent_var(env, "CACHED_LABEL=%s", buf); | |
253 | kobject_uevent_env( | |
254 | &disk_to_dev(dc->disk.disk)->kobj, KOBJ_CHANGE, env->envp); | |
255 | kfree(env); | |
cafe5635 KO |
256 | } |
257 | ||
258 | if (attr == &sysfs_attach) { | |
169ef1cf | 259 | if (bch_parse_uuid(buf, dc->sb.set_uuid) < 16) |
cafe5635 KO |
260 | return -EINVAL; |
261 | ||
262 | list_for_each_entry(c, &bch_cache_sets, list) { | |
263 | v = bch_cached_dev_attach(dc, c); | |
264 | if (!v) | |
265 | return size; | |
266 | } | |
267 | ||
268 | pr_err("Can't attach %s: cache set not found", buf); | |
269 | size = v; | |
270 | } | |
271 | ||
272 | if (attr == &sysfs_detach && dc->disk.c) | |
273 | bch_cached_dev_detach(dc); | |
274 | ||
275 | if (attr == &sysfs_stop) | |
276 | bcache_device_stop(&dc->disk); | |
277 | ||
278 | return size; | |
279 | } | |
280 | ||
281 | STORE(bch_cached_dev) | |
282 | { | |
283 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
284 | disk.kobj); | |
285 | ||
286 | mutex_lock(&bch_register_lock); | |
287 | size = __cached_dev_store(kobj, attr, buf, size); | |
288 | ||
289 | if (attr == &sysfs_writeback_running) | |
290 | bch_writeback_queue(dc); | |
291 | ||
292 | if (attr == &sysfs_writeback_percent) | |
293 | schedule_delayed_work(&dc->writeback_rate_update, | |
294 | dc->writeback_rate_update_seconds * HZ); | |
295 | ||
296 | mutex_unlock(&bch_register_lock); | |
297 | return size; | |
298 | } | |
299 | ||
300 | static struct attribute *bch_cached_dev_files[] = { | |
301 | &sysfs_attach, | |
302 | &sysfs_detach, | |
303 | &sysfs_stop, | |
304 | #if 0 | |
305 | &sysfs_data_csum, | |
306 | #endif | |
307 | &sysfs_cache_mode, | |
308 | &sysfs_writeback_metadata, | |
309 | &sysfs_writeback_running, | |
310 | &sysfs_writeback_delay, | |
311 | &sysfs_writeback_percent, | |
312 | &sysfs_writeback_rate, | |
313 | &sysfs_writeback_rate_update_seconds, | |
314 | &sysfs_writeback_rate_d_term, | |
315 | &sysfs_writeback_rate_p_term_inverse, | |
316 | &sysfs_writeback_rate_d_smooth, | |
317 | &sysfs_writeback_rate_debug, | |
318 | &sysfs_dirty_data, | |
72c27061 KO |
319 | &sysfs_stripe_size, |
320 | &sysfs_partial_stripes_expensive, | |
cafe5635 | 321 | &sysfs_sequential_cutoff, |
cafe5635 KO |
322 | &sysfs_clear_stats, |
323 | &sysfs_running, | |
324 | &sysfs_state, | |
325 | &sysfs_label, | |
326 | &sysfs_readahead, | |
327 | #ifdef CONFIG_BCACHE_DEBUG | |
328 | &sysfs_verify, | |
5ceaaad7 | 329 | &sysfs_bypass_torture_test, |
cafe5635 KO |
330 | #endif |
331 | NULL | |
332 | }; | |
333 | KTYPE(bch_cached_dev); | |
334 | ||
335 | SHOW(bch_flash_dev) | |
336 | { | |
337 | struct bcache_device *d = container_of(kobj, struct bcache_device, | |
338 | kobj); | |
339 | struct uuid_entry *u = &d->c->uuids[d->id]; | |
340 | ||
341 | sysfs_printf(data_csum, "%i", d->data_csum); | |
342 | sysfs_hprint(size, u->sectors << 9); | |
343 | ||
344 | if (attr == &sysfs_label) { | |
345 | memcpy(buf, u->label, SB_LABEL_SIZE); | |
346 | buf[SB_LABEL_SIZE + 1] = '\0'; | |
347 | strcat(buf, "\n"); | |
348 | return strlen(buf); | |
349 | } | |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
354 | STORE(__bch_flash_dev) | |
355 | { | |
356 | struct bcache_device *d = container_of(kobj, struct bcache_device, | |
357 | kobj); | |
358 | struct uuid_entry *u = &d->c->uuids[d->id]; | |
359 | ||
360 | sysfs_strtoul(data_csum, d->data_csum); | |
361 | ||
362 | if (attr == &sysfs_size) { | |
363 | uint64_t v; | |
364 | strtoi_h_or_return(buf, v); | |
365 | ||
366 | u->sectors = v >> 9; | |
367 | bch_uuid_write(d->c); | |
368 | set_capacity(d->disk, u->sectors); | |
369 | } | |
370 | ||
371 | if (attr == &sysfs_label) { | |
372 | memcpy(u->label, buf, SB_LABEL_SIZE); | |
373 | bch_uuid_write(d->c); | |
374 | } | |
375 | ||
376 | if (attr == &sysfs_unregister) { | |
c4d951dd | 377 | set_bit(BCACHE_DEV_DETACHING, &d->flags); |
cafe5635 KO |
378 | bcache_device_stop(d); |
379 | } | |
380 | ||
381 | return size; | |
382 | } | |
383 | STORE_LOCKED(bch_flash_dev) | |
384 | ||
385 | static struct attribute *bch_flash_dev_files[] = { | |
386 | &sysfs_unregister, | |
387 | #if 0 | |
388 | &sysfs_data_csum, | |
389 | #endif | |
390 | &sysfs_label, | |
391 | &sysfs_size, | |
392 | NULL | |
393 | }; | |
394 | KTYPE(bch_flash_dev); | |
395 | ||
396 | SHOW(__bch_cache_set) | |
397 | { | |
398 | unsigned root_usage(struct cache_set *c) | |
399 | { | |
400 | unsigned bytes = 0; | |
401 | struct bkey *k; | |
402 | struct btree *b; | |
403 | struct btree_iter iter; | |
404 | ||
405 | goto lock_root; | |
406 | ||
407 | do { | |
408 | rw_unlock(false, b); | |
409 | lock_root: | |
410 | b = c->root; | |
411 | rw_lock(false, b, b->level); | |
412 | } while (b != c->root); | |
413 | ||
414 | for_each_key_filter(b, k, &iter, bch_ptr_bad) | |
415 | bytes += bkey_bytes(k); | |
416 | ||
417 | rw_unlock(false, b); | |
418 | ||
419 | return (bytes * 100) / btree_bytes(c); | |
420 | } | |
421 | ||
422 | size_t cache_size(struct cache_set *c) | |
423 | { | |
424 | size_t ret = 0; | |
425 | struct btree *b; | |
426 | ||
427 | mutex_lock(&c->bucket_lock); | |
428 | list_for_each_entry(b, &c->btree_cache, list) | |
429 | ret += 1 << (b->page_order + PAGE_SHIFT); | |
430 | ||
431 | mutex_unlock(&c->bucket_lock); | |
432 | return ret; | |
433 | } | |
434 | ||
435 | unsigned cache_max_chain(struct cache_set *c) | |
436 | { | |
437 | unsigned ret = 0; | |
438 | struct hlist_head *h; | |
439 | ||
440 | mutex_lock(&c->bucket_lock); | |
441 | ||
442 | for (h = c->bucket_hash; | |
443 | h < c->bucket_hash + (1 << BUCKET_HASH_BITS); | |
444 | h++) { | |
445 | unsigned i = 0; | |
446 | struct hlist_node *p; | |
447 | ||
448 | hlist_for_each(p, h) | |
449 | i++; | |
450 | ||
451 | ret = max(ret, i); | |
452 | } | |
453 | ||
454 | mutex_unlock(&c->bucket_lock); | |
455 | return ret; | |
456 | } | |
457 | ||
458 | unsigned btree_used(struct cache_set *c) | |
459 | { | |
460 | return div64_u64(c->gc_stats.key_bytes * 100, | |
461 | (c->gc_stats.nodes ?: 1) * btree_bytes(c)); | |
462 | } | |
463 | ||
464 | unsigned average_key_size(struct cache_set *c) | |
465 | { | |
466 | return c->gc_stats.nkeys | |
467 | ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) | |
468 | : 0; | |
469 | } | |
470 | ||
471 | struct cache_set *c = container_of(kobj, struct cache_set, kobj); | |
472 | ||
473 | sysfs_print(synchronous, CACHE_SYNC(&c->sb)); | |
474 | sysfs_print(journal_delay_ms, c->journal_delay_ms); | |
475 | sysfs_hprint(bucket_size, bucket_bytes(c)); | |
476 | sysfs_hprint(block_size, block_bytes(c)); | |
477 | sysfs_print(tree_depth, c->root->level); | |
478 | sysfs_print(root_usage_percent, root_usage(c)); | |
479 | ||
480 | sysfs_hprint(btree_cache_size, cache_size(c)); | |
481 | sysfs_print(btree_cache_max_chain, cache_max_chain(c)); | |
482 | sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use); | |
483 | ||
484 | sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms); | |
485 | sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us); | |
486 | sysfs_print_time_stats(&c->sort_time, btree_sort, ms, us); | |
487 | sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); | |
488 | sysfs_print_time_stats(&c->try_harder_time, try_harder, ms, us); | |
489 | ||
490 | sysfs_print(btree_used_percent, btree_used(c)); | |
491 | sysfs_print(btree_nodes, c->gc_stats.nodes); | |
cafe5635 KO |
492 | sysfs_hprint(average_key_size, average_key_size(c)); |
493 | ||
494 | sysfs_print(cache_read_races, | |
495 | atomic_long_read(&c->cache_read_races)); | |
496 | ||
497 | sysfs_print(writeback_keys_done, | |
498 | atomic_long_read(&c->writeback_keys_done)); | |
499 | sysfs_print(writeback_keys_failed, | |
500 | atomic_long_read(&c->writeback_keys_failed)); | |
501 | ||
77c320eb KO |
502 | if (attr == &sysfs_errors) |
503 | return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, | |
504 | c->on_error); | |
505 | ||
cafe5635 KO |
506 | /* See count_io_errors for why 88 */ |
507 | sysfs_print(io_error_halflife, c->error_decay * 88); | |
508 | sysfs_print(io_error_limit, c->error_limit >> IO_ERROR_SHIFT); | |
509 | ||
510 | sysfs_hprint(congested, | |
511 | ((uint64_t) bch_get_congested(c)) << 9); | |
512 | sysfs_print(congested_read_threshold_us, | |
513 | c->congested_read_threshold_us); | |
514 | sysfs_print(congested_write_threshold_us, | |
515 | c->congested_write_threshold_us); | |
516 | ||
517 | sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); | |
518 | sysfs_printf(verify, "%i", c->verify); | |
519 | sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); | |
280481d0 KO |
520 | sysfs_printf(expensive_debug_checks, |
521 | "%i", c->expensive_debug_checks); | |
cafe5635 KO |
522 | sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); |
523 | sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); | |
524 | sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); | |
525 | ||
526 | if (attr == &sysfs_bset_tree_stats) | |
527 | return bch_bset_print_stats(c, buf); | |
528 | ||
529 | return 0; | |
530 | } | |
531 | SHOW_LOCKED(bch_cache_set) | |
532 | ||
533 | STORE(__bch_cache_set) | |
534 | { | |
535 | struct cache_set *c = container_of(kobj, struct cache_set, kobj); | |
536 | ||
537 | if (attr == &sysfs_unregister) | |
538 | bch_cache_set_unregister(c); | |
539 | ||
540 | if (attr == &sysfs_stop) | |
541 | bch_cache_set_stop(c); | |
542 | ||
543 | if (attr == &sysfs_synchronous) { | |
544 | bool sync = strtoul_or_return(buf); | |
545 | ||
546 | if (sync != CACHE_SYNC(&c->sb)) { | |
547 | SET_CACHE_SYNC(&c->sb, sync); | |
548 | bcache_write_super(c); | |
549 | } | |
550 | } | |
551 | ||
552 | if (attr == &sysfs_flash_vol_create) { | |
553 | int r; | |
554 | uint64_t v; | |
555 | strtoi_h_or_return(buf, v); | |
556 | ||
557 | r = bch_flash_dev_create(c, v); | |
558 | if (r) | |
559 | return r; | |
560 | } | |
561 | ||
562 | if (attr == &sysfs_clear_stats) { | |
563 | atomic_long_set(&c->writeback_keys_done, 0); | |
564 | atomic_long_set(&c->writeback_keys_failed, 0); | |
565 | ||
566 | memset(&c->gc_stats, 0, sizeof(struct gc_stat)); | |
567 | bch_cache_accounting_clear(&c->accounting); | |
568 | } | |
569 | ||
570 | if (attr == &sysfs_trigger_gc) | |
72a44517 | 571 | wake_up_gc(c); |
cafe5635 KO |
572 | |
573 | if (attr == &sysfs_prune_cache) { | |
574 | struct shrink_control sc; | |
575 | sc.gfp_mask = GFP_KERNEL; | |
576 | sc.nr_to_scan = strtoul_or_return(buf); | |
7dc19d5a | 577 | c->shrink.scan_objects(&c->shrink, &sc); |
cafe5635 KO |
578 | } |
579 | ||
580 | sysfs_strtoul(congested_read_threshold_us, | |
581 | c->congested_read_threshold_us); | |
582 | sysfs_strtoul(congested_write_threshold_us, | |
583 | c->congested_write_threshold_us); | |
584 | ||
77c320eb KO |
585 | if (attr == &sysfs_errors) { |
586 | ssize_t v = bch_read_string_list(buf, error_actions); | |
587 | ||
588 | if (v < 0) | |
589 | return v; | |
590 | ||
591 | c->on_error = v; | |
592 | } | |
593 | ||
cafe5635 KO |
594 | if (attr == &sysfs_io_error_limit) |
595 | c->error_limit = strtoul_or_return(buf) << IO_ERROR_SHIFT; | |
596 | ||
597 | /* See count_io_errors() for why 88 */ | |
598 | if (attr == &sysfs_io_error_halflife) | |
599 | c->error_decay = strtoul_or_return(buf) / 88; | |
600 | ||
601 | sysfs_strtoul(journal_delay_ms, c->journal_delay_ms); | |
602 | sysfs_strtoul(verify, c->verify); | |
603 | sysfs_strtoul(key_merging_disabled, c->key_merging_disabled); | |
280481d0 | 604 | sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); |
cafe5635 KO |
605 | sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite); |
606 | sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled); | |
607 | sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled); | |
608 | ||
609 | return size; | |
610 | } | |
611 | STORE_LOCKED(bch_cache_set) | |
612 | ||
613 | SHOW(bch_cache_set_internal) | |
614 | { | |
615 | struct cache_set *c = container_of(kobj, struct cache_set, internal); | |
616 | return bch_cache_set_show(&c->kobj, attr, buf); | |
617 | } | |
618 | ||
619 | STORE(bch_cache_set_internal) | |
620 | { | |
621 | struct cache_set *c = container_of(kobj, struct cache_set, internal); | |
622 | return bch_cache_set_store(&c->kobj, attr, buf, size); | |
623 | } | |
624 | ||
625 | static void bch_cache_set_internal_release(struct kobject *k) | |
626 | { | |
627 | } | |
628 | ||
629 | static struct attribute *bch_cache_set_files[] = { | |
630 | &sysfs_unregister, | |
631 | &sysfs_stop, | |
632 | &sysfs_synchronous, | |
633 | &sysfs_journal_delay_ms, | |
634 | &sysfs_flash_vol_create, | |
635 | ||
636 | &sysfs_bucket_size, | |
637 | &sysfs_block_size, | |
638 | &sysfs_tree_depth, | |
639 | &sysfs_root_usage_percent, | |
640 | &sysfs_btree_cache_size, | |
641 | &sysfs_cache_available_percent, | |
642 | ||
643 | &sysfs_average_key_size, | |
cafe5635 | 644 | |
77c320eb | 645 | &sysfs_errors, |
cafe5635 KO |
646 | &sysfs_io_error_limit, |
647 | &sysfs_io_error_halflife, | |
648 | &sysfs_congested, | |
649 | &sysfs_congested_read_threshold_us, | |
650 | &sysfs_congested_write_threshold_us, | |
651 | &sysfs_clear_stats, | |
652 | NULL | |
653 | }; | |
654 | KTYPE(bch_cache_set); | |
655 | ||
656 | static struct attribute *bch_cache_set_internal_files[] = { | |
657 | &sysfs_active_journal_entries, | |
658 | ||
659 | sysfs_time_stats_attribute_list(btree_gc, sec, ms) | |
660 | sysfs_time_stats_attribute_list(btree_split, sec, us) | |
661 | sysfs_time_stats_attribute_list(btree_sort, ms, us) | |
662 | sysfs_time_stats_attribute_list(btree_read, ms, us) | |
663 | sysfs_time_stats_attribute_list(try_harder, ms, us) | |
664 | ||
665 | &sysfs_btree_nodes, | |
666 | &sysfs_btree_used_percent, | |
667 | &sysfs_btree_cache_max_chain, | |
668 | ||
669 | &sysfs_bset_tree_stats, | |
670 | &sysfs_cache_read_races, | |
671 | &sysfs_writeback_keys_done, | |
672 | &sysfs_writeback_keys_failed, | |
673 | ||
674 | &sysfs_trigger_gc, | |
675 | &sysfs_prune_cache, | |
676 | #ifdef CONFIG_BCACHE_DEBUG | |
677 | &sysfs_verify, | |
678 | &sysfs_key_merging_disabled, | |
280481d0 | 679 | &sysfs_expensive_debug_checks, |
cafe5635 KO |
680 | #endif |
681 | &sysfs_gc_always_rewrite, | |
682 | &sysfs_btree_shrinker_disabled, | |
683 | &sysfs_copy_gc_enabled, | |
684 | NULL | |
685 | }; | |
686 | KTYPE(bch_cache_set_internal); | |
687 | ||
688 | SHOW(__bch_cache) | |
689 | { | |
690 | struct cache *ca = container_of(kobj, struct cache, kobj); | |
691 | ||
692 | sysfs_hprint(bucket_size, bucket_bytes(ca)); | |
693 | sysfs_hprint(block_size, block_bytes(ca)); | |
694 | sysfs_print(nbuckets, ca->sb.nbuckets); | |
695 | sysfs_print(discard, ca->discard); | |
696 | sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); | |
697 | sysfs_hprint(btree_written, | |
698 | atomic_long_read(&ca->btree_sectors_written) << 9); | |
699 | sysfs_hprint(metadata_written, | |
700 | (atomic_long_read(&ca->meta_sectors_written) + | |
701 | atomic_long_read(&ca->btree_sectors_written)) << 9); | |
702 | ||
703 | sysfs_print(io_errors, | |
704 | atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); | |
705 | ||
706 | sysfs_print(freelist_percent, ca->free.size * 100 / | |
707 | ((size_t) ca->sb.nbuckets)); | |
708 | ||
709 | if (attr == &sysfs_cache_replacement_policy) | |
169ef1cf KO |
710 | return bch_snprint_string_list(buf, PAGE_SIZE, |
711 | cache_replacement_policies, | |
712 | CACHE_REPLACEMENT(&ca->sb)); | |
cafe5635 KO |
713 | |
714 | if (attr == &sysfs_priority_stats) { | |
715 | int cmp(const void *l, const void *r) | |
716 | { return *((uint16_t *) r) - *((uint16_t *) l); } | |
717 | ||
cafe5635 KO |
718 | size_t n = ca->sb.nbuckets, i, unused, btree; |
719 | uint64_t sum = 0; | |
bbc77aa7 KO |
720 | /* Compute 31 quantiles */ |
721 | uint16_t q[31], *p, *cached; | |
cafe5635 KO |
722 | ssize_t ret; |
723 | ||
724 | cached = p = vmalloc(ca->sb.nbuckets * sizeof(uint16_t)); | |
725 | if (!p) | |
726 | return -ENOMEM; | |
727 | ||
728 | mutex_lock(&ca->set->bucket_lock); | |
729 | for (i = ca->sb.first_bucket; i < n; i++) | |
730 | p[i] = ca->buckets[i].prio; | |
731 | mutex_unlock(&ca->set->bucket_lock); | |
732 | ||
733 | sort(p, n, sizeof(uint16_t), cmp, NULL); | |
734 | ||
735 | while (n && | |
736 | !cached[n - 1]) | |
737 | --n; | |
738 | ||
739 | unused = ca->sb.nbuckets - n; | |
740 | ||
741 | while (cached < p + n && | |
742 | *cached == BTREE_PRIO) | |
743 | cached++; | |
744 | ||
745 | btree = cached - p; | |
746 | n -= btree; | |
747 | ||
748 | for (i = 0; i < n; i++) | |
749 | sum += INITIAL_PRIO - cached[i]; | |
750 | ||
751 | if (n) | |
752 | do_div(sum, n); | |
753 | ||
bbc77aa7 KO |
754 | for (i = 0; i < ARRAY_SIZE(q); i++) |
755 | q[i] = INITIAL_PRIO - cached[n * (i + 1) / | |
756 | (ARRAY_SIZE(q) + 1)]; | |
cafe5635 KO |
757 | |
758 | vfree(p); | |
759 | ||
bbc77aa7 KO |
760 | ret = scnprintf(buf, PAGE_SIZE, |
761 | "Unused: %zu%%\n" | |
762 | "Metadata: %zu%%\n" | |
763 | "Average: %llu\n" | |
764 | "Sectors per Q: %zu\n" | |
765 | "Quantiles: [", | |
766 | unused * 100 / (size_t) ca->sb.nbuckets, | |
767 | btree * 100 / (size_t) ca->sb.nbuckets, sum, | |
768 | n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1)); | |
769 | ||
770 | for (i = 0; i < ARRAY_SIZE(q); i++) | |
771 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, | |
772 | "%u ", q[i]); | |
773 | ret--; | |
774 | ||
775 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); | |
776 | ||
cafe5635 KO |
777 | return ret; |
778 | } | |
779 | ||
780 | return 0; | |
781 | } | |
782 | SHOW_LOCKED(bch_cache) | |
783 | ||
784 | STORE(__bch_cache) | |
785 | { | |
786 | struct cache *ca = container_of(kobj, struct cache, kobj); | |
787 | ||
788 | if (attr == &sysfs_discard) { | |
789 | bool v = strtoul_or_return(buf); | |
790 | ||
791 | if (blk_queue_discard(bdev_get_queue(ca->bdev))) | |
792 | ca->discard = v; | |
793 | ||
794 | if (v != CACHE_DISCARD(&ca->sb)) { | |
795 | SET_CACHE_DISCARD(&ca->sb, v); | |
796 | bcache_write_super(ca->set); | |
797 | } | |
798 | } | |
799 | ||
800 | if (attr == &sysfs_cache_replacement_policy) { | |
169ef1cf | 801 | ssize_t v = bch_read_string_list(buf, cache_replacement_policies); |
cafe5635 KO |
802 | |
803 | if (v < 0) | |
804 | return v; | |
805 | ||
806 | if ((unsigned) v != CACHE_REPLACEMENT(&ca->sb)) { | |
807 | mutex_lock(&ca->set->bucket_lock); | |
808 | SET_CACHE_REPLACEMENT(&ca->sb, v); | |
809 | mutex_unlock(&ca->set->bucket_lock); | |
810 | ||
811 | bcache_write_super(ca->set); | |
812 | } | |
813 | } | |
814 | ||
815 | if (attr == &sysfs_freelist_percent) { | |
816 | DECLARE_FIFO(long, free); | |
817 | long i; | |
818 | size_t p = strtoul_or_return(buf); | |
819 | ||
820 | p = clamp_t(size_t, | |
821 | ((size_t) ca->sb.nbuckets * p) / 100, | |
822 | roundup_pow_of_two(ca->sb.nbuckets) >> 9, | |
823 | ca->sb.nbuckets / 2); | |
824 | ||
825 | if (!init_fifo_exact(&free, p, GFP_KERNEL)) | |
826 | return -ENOMEM; | |
827 | ||
828 | mutex_lock(&ca->set->bucket_lock); | |
829 | ||
830 | fifo_move(&free, &ca->free); | |
831 | fifo_swap(&free, &ca->free); | |
832 | ||
833 | mutex_unlock(&ca->set->bucket_lock); | |
834 | ||
835 | while (fifo_pop(&free, i)) | |
836 | atomic_dec(&ca->buckets[i].pin); | |
837 | ||
838 | free_fifo(&free); | |
839 | } | |
840 | ||
841 | if (attr == &sysfs_clear_stats) { | |
842 | atomic_long_set(&ca->sectors_written, 0); | |
843 | atomic_long_set(&ca->btree_sectors_written, 0); | |
844 | atomic_long_set(&ca->meta_sectors_written, 0); | |
845 | atomic_set(&ca->io_count, 0); | |
846 | atomic_set(&ca->io_errors, 0); | |
847 | } | |
848 | ||
849 | return size; | |
850 | } | |
851 | STORE_LOCKED(bch_cache) | |
852 | ||
853 | static struct attribute *bch_cache_files[] = { | |
854 | &sysfs_bucket_size, | |
855 | &sysfs_block_size, | |
856 | &sysfs_nbuckets, | |
857 | &sysfs_priority_stats, | |
858 | &sysfs_discard, | |
859 | &sysfs_written, | |
860 | &sysfs_btree_written, | |
861 | &sysfs_metadata_written, | |
862 | &sysfs_io_errors, | |
863 | &sysfs_clear_stats, | |
864 | &sysfs_freelist_percent, | |
865 | &sysfs_cache_replacement_policy, | |
866 | NULL | |
867 | }; | |
868 | KTYPE(bch_cache); |