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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * bcache sysfs interfaces
4 *
5 * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
6 * Copyright 2012 Google, Inc.
7 */
8
9#include "bcache.h"
10#include "sysfs.h"
11#include "btree.h"
12#include "request.h"
13#include "writeback.h"
14
15#include <linux/blkdev.h>
16#include <linux/sort.h>
17#include <linux/sched/clock.h>
18
19static const char * const cache_replacement_policies[] = {
20 "lru",
21 "fifo",
22 "random",
23 NULL
24};
25
26static const char * const error_actions[] = {
27 "unregister",
28 "panic",
29 NULL
30};
31
32write_attribute(attach);
33write_attribute(detach);
34write_attribute(unregister);
35write_attribute(stop);
36write_attribute(clear_stats);
37write_attribute(trigger_gc);
38write_attribute(prune_cache);
39write_attribute(flash_vol_create);
40
41read_attribute(bucket_size);
42read_attribute(block_size);
43read_attribute(nbuckets);
44read_attribute(tree_depth);
45read_attribute(root_usage_percent);
46read_attribute(priority_stats);
47read_attribute(btree_cache_size);
48read_attribute(btree_cache_max_chain);
49read_attribute(cache_available_percent);
50read_attribute(written);
51read_attribute(btree_written);
52read_attribute(metadata_written);
53read_attribute(active_journal_entries);
54
55sysfs_time_stats_attribute(btree_gc, sec, ms);
56sysfs_time_stats_attribute(btree_split, sec, us);
57sysfs_time_stats_attribute(btree_sort, ms, us);
58sysfs_time_stats_attribute(btree_read, ms, us);
59
60read_attribute(btree_nodes);
61read_attribute(btree_used_percent);
62read_attribute(average_key_size);
63read_attribute(dirty_data);
64read_attribute(bset_tree_stats);
65
66read_attribute(state);
67read_attribute(cache_read_races);
68read_attribute(reclaim);
69read_attribute(flush_write);
70read_attribute(retry_flush_write);
71read_attribute(writeback_keys_done);
72read_attribute(writeback_keys_failed);
73read_attribute(io_errors);
74read_attribute(congested);
75rw_attribute(congested_read_threshold_us);
76rw_attribute(congested_write_threshold_us);
77
78rw_attribute(sequential_cutoff);
79rw_attribute(data_csum);
80rw_attribute(cache_mode);
81rw_attribute(stop_when_cache_set_failed);
82rw_attribute(writeback_metadata);
83rw_attribute(writeback_running);
84rw_attribute(writeback_percent);
85rw_attribute(writeback_delay);
86rw_attribute(writeback_rate);
87
88rw_attribute(writeback_rate_update_seconds);
89rw_attribute(writeback_rate_i_term_inverse);
90rw_attribute(writeback_rate_p_term_inverse);
91rw_attribute(writeback_rate_minimum);
92read_attribute(writeback_rate_debug);
93
94read_attribute(stripe_size);
95read_attribute(partial_stripes_expensive);
96
97rw_attribute(synchronous);
98rw_attribute(journal_delay_ms);
99rw_attribute(io_disable);
100rw_attribute(discard);
101rw_attribute(running);
102rw_attribute(label);
103rw_attribute(readahead);
104rw_attribute(errors);
105rw_attribute(io_error_limit);
106rw_attribute(io_error_halflife);
107rw_attribute(verify);
108rw_attribute(bypass_torture_test);
109rw_attribute(key_merging_disabled);
110rw_attribute(gc_always_rewrite);
111rw_attribute(expensive_debug_checks);
112rw_attribute(cache_replacement_policy);
113rw_attribute(btree_shrinker_disabled);
114rw_attribute(copy_gc_enabled);
115rw_attribute(size);
116
117SHOW(__bch_cached_dev)
118{
119 struct cached_dev *dc = container_of(kobj, struct cached_dev,
120 disk.kobj);
121 const char *states[] = { "no cache", "clean", "dirty", "inconsistent" };
122
123#define var(stat) (dc->stat)
124
125 if (attr == &sysfs_cache_mode)
126 return bch_snprint_string_list(buf, PAGE_SIZE,
127 bch_cache_modes + 1,
128 BDEV_CACHE_MODE(&dc->sb));
129
130 if (attr == &sysfs_stop_when_cache_set_failed)
131 return bch_snprint_string_list(buf, PAGE_SIZE,
132 bch_stop_on_failure_modes + 1,
133 dc->stop_when_cache_set_failed);
134
135
136 sysfs_printf(data_csum, "%i", dc->disk.data_csum);
137 var_printf(verify, "%i");
138 var_printf(bypass_torture_test, "%i");
139 var_printf(writeback_metadata, "%i");
140 var_printf(writeback_running, "%i");
141 var_print(writeback_delay);
142 var_print(writeback_percent);
143 sysfs_hprint(writeback_rate, dc->writeback_rate.rate << 9);
144 sysfs_hprint(io_errors, atomic_read(&dc->io_errors));
145 sysfs_printf(io_error_limit, "%i", dc->error_limit);
146 sysfs_printf(io_disable, "%i", dc->io_disable);
147 var_print(writeback_rate_update_seconds);
148 var_print(writeback_rate_i_term_inverse);
149 var_print(writeback_rate_p_term_inverse);
150 var_print(writeback_rate_minimum);
151
152 if (attr == &sysfs_writeback_rate_debug) {
153 char rate[20];
154 char dirty[20];
155 char target[20];
156 char proportional[20];
157 char integral[20];
158 char change[20];
159 s64 next_io;
160
161 bch_hprint(rate, dc->writeback_rate.rate << 9);
162 bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9);
163 bch_hprint(target, dc->writeback_rate_target << 9);
164 bch_hprint(proportional,dc->writeback_rate_proportional << 9);
165 bch_hprint(integral, dc->writeback_rate_integral_scaled << 9);
166 bch_hprint(change, dc->writeback_rate_change << 9);
167
168 next_io = div64_s64(dc->writeback_rate.next - local_clock(),
169 NSEC_PER_MSEC);
170
171 return sprintf(buf,
172 "rate:\t\t%s/sec\n"
173 "dirty:\t\t%s\n"
174 "target:\t\t%s\n"
175 "proportional:\t%s\n"
176 "integral:\t%s\n"
177 "change:\t\t%s/sec\n"
178 "next io:\t%llims\n",
179 rate, dirty, target, proportional,
180 integral, change, next_io);
181 }
182
183 sysfs_hprint(dirty_data,
184 bcache_dev_sectors_dirty(&dc->disk) << 9);
185
186 sysfs_hprint(stripe_size, ((uint64_t)dc->disk.stripe_size) << 9);
187 var_printf(partial_stripes_expensive, "%u");
188
189 var_hprint(sequential_cutoff);
190 var_hprint(readahead);
191
192 sysfs_print(running, atomic_read(&dc->running));
193 sysfs_print(state, states[BDEV_STATE(&dc->sb)]);
194
195 if (attr == &sysfs_label) {
196 memcpy(buf, dc->sb.label, SB_LABEL_SIZE);
197 buf[SB_LABEL_SIZE + 1] = '\0';
198 strcat(buf, "\n");
199 return strlen(buf);
200 }
201
202#undef var
203 return 0;
204}
205SHOW_LOCKED(bch_cached_dev)
206
207STORE(__cached_dev)
208{
209 struct cached_dev *dc = container_of(kobj, struct cached_dev,
210 disk.kobj);
211 ssize_t v;
212 struct cache_set *c;
213 struct kobj_uevent_env *env;
214
215#define d_strtoul(var) sysfs_strtoul(var, dc->var)
216#define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX)
217#define d_strtoi_h(var) sysfs_hatoi(var, dc->var)
218
219 sysfs_strtoul(data_csum, dc->disk.data_csum);
220 d_strtoul(verify);
221 d_strtoul(bypass_torture_test);
222 d_strtoul(writeback_metadata);
223 d_strtoul(writeback_running);
224 d_strtoul(writeback_delay);
225
226 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40);
227
228 sysfs_strtoul_clamp(writeback_rate,
229 dc->writeback_rate.rate, 1, INT_MAX);
230
231 sysfs_strtoul_clamp(writeback_rate_update_seconds,
232 dc->writeback_rate_update_seconds,
233 1, WRITEBACK_RATE_UPDATE_SECS_MAX);
234 d_strtoul(writeback_rate_i_term_inverse);
235 d_strtoul_nonzero(writeback_rate_p_term_inverse);
236
237 sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX);
238
239 if (attr == &sysfs_io_disable) {
240 int v = strtoul_or_return(buf);
241
242 dc->io_disable = v ? 1 : 0;
243 }
244
245 d_strtoi_h(sequential_cutoff);
246 d_strtoi_h(readahead);
247
248 if (attr == &sysfs_clear_stats)
249 bch_cache_accounting_clear(&dc->accounting);
250
251 if (attr == &sysfs_running &&
252 strtoul_or_return(buf))
253 bch_cached_dev_run(dc);
254
255 if (attr == &sysfs_cache_mode) {
256 v = bch_read_string_list(buf, bch_cache_modes + 1);
257
258 if (v < 0)
259 return v;
260
261 if ((unsigned) v != BDEV_CACHE_MODE(&dc->sb)) {
262 SET_BDEV_CACHE_MODE(&dc->sb, v);
263 bch_write_bdev_super(dc, NULL);
264 }
265 }
266
267 if (attr == &sysfs_stop_when_cache_set_failed) {
268 v = bch_read_string_list(buf, bch_stop_on_failure_modes + 1);
269
270 if (v < 0)
271 return v;
272
273 dc->stop_when_cache_set_failed = v;
274 }
275
276 if (attr == &sysfs_label) {
277 if (size > SB_LABEL_SIZE)
278 return -EINVAL;
279 memcpy(dc->sb.label, buf, size);
280 if (size < SB_LABEL_SIZE)
281 dc->sb.label[size] = '\0';
282 if (size && dc->sb.label[size - 1] == '\n')
283 dc->sb.label[size - 1] = '\0';
284 bch_write_bdev_super(dc, NULL);
285 if (dc->disk.c) {
286 memcpy(dc->disk.c->uuids[dc->disk.id].label,
287 buf, SB_LABEL_SIZE);
288 bch_uuid_write(dc->disk.c);
289 }
290 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
291 if (!env)
292 return -ENOMEM;
293 add_uevent_var(env, "DRIVER=bcache");
294 add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid),
295 add_uevent_var(env, "CACHED_LABEL=%s", buf);
296 kobject_uevent_env(
297 &disk_to_dev(dc->disk.disk)->kobj, KOBJ_CHANGE, env->envp);
298 kfree(env);
299 }
300
301 if (attr == &sysfs_attach) {
302 uint8_t set_uuid[16];
303
304 if (bch_parse_uuid(buf, set_uuid) < 16)
305 return -EINVAL;
306
307 v = -ENOENT;
308 list_for_each_entry(c, &bch_cache_sets, list) {
309 v = bch_cached_dev_attach(dc, c, set_uuid);
310 if (!v)
311 return size;
312 }
313
314 pr_err("Can't attach %s: cache set not found", buf);
315 return v;
316 }
317
318 if (attr == &sysfs_detach && dc->disk.c)
319 bch_cached_dev_detach(dc);
320
321 if (attr == &sysfs_stop)
322 bcache_device_stop(&dc->disk);
323
324 return size;
325}
326
327STORE(bch_cached_dev)
328{
329 struct cached_dev *dc = container_of(kobj, struct cached_dev,
330 disk.kobj);
331
332 mutex_lock(&bch_register_lock);
333 size = __cached_dev_store(kobj, attr, buf, size);
334
335 if (attr == &sysfs_writeback_running)
336 bch_writeback_queue(dc);
337
338 if (attr == &sysfs_writeback_percent)
339 if (!test_and_set_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags))
340 schedule_delayed_work(&dc->writeback_rate_update,
341 dc->writeback_rate_update_seconds * HZ);
342
343 mutex_unlock(&bch_register_lock);
344 return size;
345}
346
347static struct attribute *bch_cached_dev_files[] = {
348 &sysfs_attach,
349 &sysfs_detach,
350 &sysfs_stop,
351#if 0
352 &sysfs_data_csum,
353#endif
354 &sysfs_cache_mode,
355 &sysfs_stop_when_cache_set_failed,
356 &sysfs_writeback_metadata,
357 &sysfs_writeback_running,
358 &sysfs_writeback_delay,
359 &sysfs_writeback_percent,
360 &sysfs_writeback_rate,
361 &sysfs_writeback_rate_update_seconds,
362 &sysfs_writeback_rate_i_term_inverse,
363 &sysfs_writeback_rate_p_term_inverse,
364 &sysfs_writeback_rate_debug,
365 &sysfs_errors,
366 &sysfs_io_error_limit,
367 &sysfs_io_disable,
368 &sysfs_dirty_data,
369 &sysfs_stripe_size,
370 &sysfs_partial_stripes_expensive,
371 &sysfs_sequential_cutoff,
372 &sysfs_clear_stats,
373 &sysfs_running,
374 &sysfs_state,
375 &sysfs_label,
376 &sysfs_readahead,
377#ifdef CONFIG_BCACHE_DEBUG
378 &sysfs_verify,
379 &sysfs_bypass_torture_test,
380#endif
381 NULL
382};
383KTYPE(bch_cached_dev);
384
385SHOW(bch_flash_dev)
386{
387 struct bcache_device *d = container_of(kobj, struct bcache_device,
388 kobj);
389 struct uuid_entry *u = &d->c->uuids[d->id];
390
391 sysfs_printf(data_csum, "%i", d->data_csum);
392 sysfs_hprint(size, u->sectors << 9);
393
394 if (attr == &sysfs_label) {
395 memcpy(buf, u->label, SB_LABEL_SIZE);
396 buf[SB_LABEL_SIZE + 1] = '\0';
397 strcat(buf, "\n");
398 return strlen(buf);
399 }
400
401 return 0;
402}
403
404STORE(__bch_flash_dev)
405{
406 struct bcache_device *d = container_of(kobj, struct bcache_device,
407 kobj);
408 struct uuid_entry *u = &d->c->uuids[d->id];
409
410 sysfs_strtoul(data_csum, d->data_csum);
411
412 if (attr == &sysfs_size) {
413 uint64_t v;
414 strtoi_h_or_return(buf, v);
415
416 u->sectors = v >> 9;
417 bch_uuid_write(d->c);
418 set_capacity(d->disk, u->sectors);
419 }
420
421 if (attr == &sysfs_label) {
422 memcpy(u->label, buf, SB_LABEL_SIZE);
423 bch_uuid_write(d->c);
424 }
425
426 if (attr == &sysfs_unregister) {
427 set_bit(BCACHE_DEV_DETACHING, &d->flags);
428 bcache_device_stop(d);
429 }
430
431 return size;
432}
433STORE_LOCKED(bch_flash_dev)
434
435static struct attribute *bch_flash_dev_files[] = {
436 &sysfs_unregister,
437#if 0
438 &sysfs_data_csum,
439#endif
440 &sysfs_label,
441 &sysfs_size,
442 NULL
443};
444KTYPE(bch_flash_dev);
445
446struct bset_stats_op {
447 struct btree_op op;
448 size_t nodes;
449 struct bset_stats stats;
450};
451
452static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b)
453{
454 struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op);
455
456 op->nodes++;
457 bch_btree_keys_stats(&b->keys, &op->stats);
458
459 return MAP_CONTINUE;
460}
461
462static int bch_bset_print_stats(struct cache_set *c, char *buf)
463{
464 struct bset_stats_op op;
465 int ret;
466
467 memset(&op, 0, sizeof(op));
468 bch_btree_op_init(&op.op, -1);
469
470 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats);
471 if (ret < 0)
472 return ret;
473
474 return snprintf(buf, PAGE_SIZE,
475 "btree nodes: %zu\n"
476 "written sets: %zu\n"
477 "unwritten sets: %zu\n"
478 "written key bytes: %zu\n"
479 "unwritten key bytes: %zu\n"
480 "floats: %zu\n"
481 "failed: %zu\n",
482 op.nodes,
483 op.stats.sets_written, op.stats.sets_unwritten,
484 op.stats.bytes_written, op.stats.bytes_unwritten,
485 op.stats.floats, op.stats.failed);
486}
487
488static unsigned bch_root_usage(struct cache_set *c)
489{
490 unsigned bytes = 0;
491 struct bkey *k;
492 struct btree *b;
493 struct btree_iter iter;
494
495 goto lock_root;
496
497 do {
498 rw_unlock(false, b);
499lock_root:
500 b = c->root;
501 rw_lock(false, b, b->level);
502 } while (b != c->root);
503
504 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad)
505 bytes += bkey_bytes(k);
506
507 rw_unlock(false, b);
508
509 return (bytes * 100) / btree_bytes(c);
510}
511
512static size_t bch_cache_size(struct cache_set *c)
513{
514 size_t ret = 0;
515 struct btree *b;
516
517 mutex_lock(&c->bucket_lock);
518 list_for_each_entry(b, &c->btree_cache, list)
519 ret += 1 << (b->keys.page_order + PAGE_SHIFT);
520
521 mutex_unlock(&c->bucket_lock);
522 return ret;
523}
524
525static unsigned bch_cache_max_chain(struct cache_set *c)
526{
527 unsigned ret = 0;
528 struct hlist_head *h;
529
530 mutex_lock(&c->bucket_lock);
531
532 for (h = c->bucket_hash;
533 h < c->bucket_hash + (1 << BUCKET_HASH_BITS);
534 h++) {
535 unsigned i = 0;
536 struct hlist_node *p;
537
538 hlist_for_each(p, h)
539 i++;
540
541 ret = max(ret, i);
542 }
543
544 mutex_unlock(&c->bucket_lock);
545 return ret;
546}
547
548static unsigned bch_btree_used(struct cache_set *c)
549{
550 return div64_u64(c->gc_stats.key_bytes * 100,
551 (c->gc_stats.nodes ?: 1) * btree_bytes(c));
552}
553
554static unsigned bch_average_key_size(struct cache_set *c)
555{
556 return c->gc_stats.nkeys
557 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys)
558 : 0;
559}
560
561SHOW(__bch_cache_set)
562{
563 struct cache_set *c = container_of(kobj, struct cache_set, kobj);
564
565 sysfs_print(synchronous, CACHE_SYNC(&c->sb));
566 sysfs_print(journal_delay_ms, c->journal_delay_ms);
567 sysfs_hprint(bucket_size, bucket_bytes(c));
568 sysfs_hprint(block_size, block_bytes(c));
569 sysfs_print(tree_depth, c->root->level);
570 sysfs_print(root_usage_percent, bch_root_usage(c));
571
572 sysfs_hprint(btree_cache_size, bch_cache_size(c));
573 sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c));
574 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use);
575
576 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms);
577 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us);
578 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us);
579 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us);
580
581 sysfs_print(btree_used_percent, bch_btree_used(c));
582 sysfs_print(btree_nodes, c->gc_stats.nodes);
583 sysfs_hprint(average_key_size, bch_average_key_size(c));
584
585 sysfs_print(cache_read_races,
586 atomic_long_read(&c->cache_read_races));
587
588 sysfs_print(reclaim,
589 atomic_long_read(&c->reclaim));
590
591 sysfs_print(flush_write,
592 atomic_long_read(&c->flush_write));
593
594 sysfs_print(retry_flush_write,
595 atomic_long_read(&c->retry_flush_write));
596
597 sysfs_print(writeback_keys_done,
598 atomic_long_read(&c->writeback_keys_done));
599 sysfs_print(writeback_keys_failed,
600 atomic_long_read(&c->writeback_keys_failed));
601
602 if (attr == &sysfs_errors)
603 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions,
604 c->on_error);
605
606 /* See count_io_errors for why 88 */
607 sysfs_print(io_error_halflife, c->error_decay * 88);
608 sysfs_print(io_error_limit, c->error_limit);
609
610 sysfs_hprint(congested,
611 ((uint64_t) bch_get_congested(c)) << 9);
612 sysfs_print(congested_read_threshold_us,
613 c->congested_read_threshold_us);
614 sysfs_print(congested_write_threshold_us,
615 c->congested_write_threshold_us);
616
617 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin));
618 sysfs_printf(verify, "%i", c->verify);
619 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled);
620 sysfs_printf(expensive_debug_checks,
621 "%i", c->expensive_debug_checks);
622 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite);
623 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled);
624 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled);
625 sysfs_printf(io_disable, "%i",
626 test_bit(CACHE_SET_IO_DISABLE, &c->flags));
627
628 if (attr == &sysfs_bset_tree_stats)
629 return bch_bset_print_stats(c, buf);
630
631 return 0;
632}
633SHOW_LOCKED(bch_cache_set)
634
635STORE(__bch_cache_set)
636{
637 struct cache_set *c = container_of(kobj, struct cache_set, kobj);
638
639 if (attr == &sysfs_unregister)
640 bch_cache_set_unregister(c);
641
642 if (attr == &sysfs_stop)
643 bch_cache_set_stop(c);
644
645 if (attr == &sysfs_synchronous) {
646 bool sync = strtoul_or_return(buf);
647
648 if (sync != CACHE_SYNC(&c->sb)) {
649 SET_CACHE_SYNC(&c->sb, sync);
650 bcache_write_super(c);
651 }
652 }
653
654 if (attr == &sysfs_flash_vol_create) {
655 int r;
656 uint64_t v;
657 strtoi_h_or_return(buf, v);
658
659 r = bch_flash_dev_create(c, v);
660 if (r)
661 return r;
662 }
663
664 if (attr == &sysfs_clear_stats) {
665 atomic_long_set(&c->writeback_keys_done, 0);
666 atomic_long_set(&c->writeback_keys_failed, 0);
667
668 memset(&c->gc_stats, 0, sizeof(struct gc_stat));
669 bch_cache_accounting_clear(&c->accounting);
670 }
671
672 if (attr == &sysfs_trigger_gc) {
673 /*
674 * Garbage collection thread only works when sectors_to_gc < 0,
675 * when users write to sysfs entry trigger_gc, most of time
676 * they want to forcibly triger gargage collection. Here -1 is
677 * set to c->sectors_to_gc, to make gc_should_run() give a
678 * chance to permit gc thread to run. "give a chance" means
679 * before going into gc_should_run(), there is still chance
680 * that c->sectors_to_gc being set to other positive value. So
681 * writing sysfs entry trigger_gc won't always make sure gc
682 * thread takes effect.
683 */
684 atomic_set(&c->sectors_to_gc, -1);
685 wake_up_gc(c);
686 }
687
688 if (attr == &sysfs_prune_cache) {
689 struct shrink_control sc;
690 sc.gfp_mask = GFP_KERNEL;
691 sc.nr_to_scan = strtoul_or_return(buf);
692 c->shrink.scan_objects(&c->shrink, &sc);
693 }
694
695 sysfs_strtoul(congested_read_threshold_us,
696 c->congested_read_threshold_us);
697 sysfs_strtoul(congested_write_threshold_us,
698 c->congested_write_threshold_us);
699
700 if (attr == &sysfs_errors) {
701 ssize_t v = bch_read_string_list(buf, error_actions);
702
703 if (v < 0)
704 return v;
705
706 c->on_error = v;
707 }
708
709 if (attr == &sysfs_io_error_limit)
710 c->error_limit = strtoul_or_return(buf);
711
712 /* See count_io_errors() for why 88 */
713 if (attr == &sysfs_io_error_halflife)
714 c->error_decay = strtoul_or_return(buf) / 88;
715
716 if (attr == &sysfs_io_disable) {
717 int v = strtoul_or_return(buf);
718
719 if (v) {
720 if (test_and_set_bit(CACHE_SET_IO_DISABLE,
721 &c->flags))
722 pr_warn("CACHE_SET_IO_DISABLE already set");
723 } else {
724 if (!test_and_clear_bit(CACHE_SET_IO_DISABLE,
725 &c->flags))
726 pr_warn("CACHE_SET_IO_DISABLE already cleared");
727 }
728 }
729
730 sysfs_strtoul(journal_delay_ms, c->journal_delay_ms);
731 sysfs_strtoul(verify, c->verify);
732 sysfs_strtoul(key_merging_disabled, c->key_merging_disabled);
733 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks);
734 sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite);
735 sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled);
736 sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled);
737
738 return size;
739}
740STORE_LOCKED(bch_cache_set)
741
742SHOW(bch_cache_set_internal)
743{
744 struct cache_set *c = container_of(kobj, struct cache_set, internal);
745 return bch_cache_set_show(&c->kobj, attr, buf);
746}
747
748STORE(bch_cache_set_internal)
749{
750 struct cache_set *c = container_of(kobj, struct cache_set, internal);
751 return bch_cache_set_store(&c->kobj, attr, buf, size);
752}
753
754static void bch_cache_set_internal_release(struct kobject *k)
755{
756}
757
758static struct attribute *bch_cache_set_files[] = {
759 &sysfs_unregister,
760 &sysfs_stop,
761 &sysfs_synchronous,
762 &sysfs_journal_delay_ms,
763 &sysfs_flash_vol_create,
764
765 &sysfs_bucket_size,
766 &sysfs_block_size,
767 &sysfs_tree_depth,
768 &sysfs_root_usage_percent,
769 &sysfs_btree_cache_size,
770 &sysfs_cache_available_percent,
771
772 &sysfs_average_key_size,
773
774 &sysfs_errors,
775 &sysfs_io_error_limit,
776 &sysfs_io_error_halflife,
777 &sysfs_congested,
778 &sysfs_congested_read_threshold_us,
779 &sysfs_congested_write_threshold_us,
780 &sysfs_clear_stats,
781 NULL
782};
783KTYPE(bch_cache_set);
784
785static struct attribute *bch_cache_set_internal_files[] = {
786 &sysfs_active_journal_entries,
787
788 sysfs_time_stats_attribute_list(btree_gc, sec, ms)
789 sysfs_time_stats_attribute_list(btree_split, sec, us)
790 sysfs_time_stats_attribute_list(btree_sort, ms, us)
791 sysfs_time_stats_attribute_list(btree_read, ms, us)
792
793 &sysfs_btree_nodes,
794 &sysfs_btree_used_percent,
795 &sysfs_btree_cache_max_chain,
796
797 &sysfs_bset_tree_stats,
798 &sysfs_cache_read_races,
799 &sysfs_reclaim,
800 &sysfs_flush_write,
801 &sysfs_retry_flush_write,
802 &sysfs_writeback_keys_done,
803 &sysfs_writeback_keys_failed,
804
805 &sysfs_trigger_gc,
806 &sysfs_prune_cache,
807#ifdef CONFIG_BCACHE_DEBUG
808 &sysfs_verify,
809 &sysfs_key_merging_disabled,
810 &sysfs_expensive_debug_checks,
811#endif
812 &sysfs_gc_always_rewrite,
813 &sysfs_btree_shrinker_disabled,
814 &sysfs_copy_gc_enabled,
815 &sysfs_io_disable,
816 NULL
817};
818KTYPE(bch_cache_set_internal);
819
820static int __bch_cache_cmp(const void *l, const void *r)
821{
822 return *((uint16_t *)r) - *((uint16_t *)l);
823}
824
825SHOW(__bch_cache)
826{
827 struct cache *ca = container_of(kobj, struct cache, kobj);
828
829 sysfs_hprint(bucket_size, bucket_bytes(ca));
830 sysfs_hprint(block_size, block_bytes(ca));
831 sysfs_print(nbuckets, ca->sb.nbuckets);
832 sysfs_print(discard, ca->discard);
833 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9);
834 sysfs_hprint(btree_written,
835 atomic_long_read(&ca->btree_sectors_written) << 9);
836 sysfs_hprint(metadata_written,
837 (atomic_long_read(&ca->meta_sectors_written) +
838 atomic_long_read(&ca->btree_sectors_written)) << 9);
839
840 sysfs_print(io_errors,
841 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT);
842
843 if (attr == &sysfs_cache_replacement_policy)
844 return bch_snprint_string_list(buf, PAGE_SIZE,
845 cache_replacement_policies,
846 CACHE_REPLACEMENT(&ca->sb));
847
848 if (attr == &sysfs_priority_stats) {
849 struct bucket *b;
850 size_t n = ca->sb.nbuckets, i;
851 size_t unused = 0, available = 0, dirty = 0, meta = 0;
852 uint64_t sum = 0;
853 /* Compute 31 quantiles */
854 uint16_t q[31], *p, *cached;
855 ssize_t ret;
856
857 cached = p = vmalloc(ca->sb.nbuckets * sizeof(uint16_t));
858 if (!p)
859 return -ENOMEM;
860
861 mutex_lock(&ca->set->bucket_lock);
862 for_each_bucket(b, ca) {
863 if (!GC_SECTORS_USED(b))
864 unused++;
865 if (GC_MARK(b) == GC_MARK_RECLAIMABLE)
866 available++;
867 if (GC_MARK(b) == GC_MARK_DIRTY)
868 dirty++;
869 if (GC_MARK(b) == GC_MARK_METADATA)
870 meta++;
871 }
872
873 for (i = ca->sb.first_bucket; i < n; i++)
874 p[i] = ca->buckets[i].prio;
875 mutex_unlock(&ca->set->bucket_lock);
876
877 sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL);
878
879 while (n &&
880 !cached[n - 1])
881 --n;
882
883 unused = ca->sb.nbuckets - n;
884
885 while (cached < p + n &&
886 *cached == BTREE_PRIO)
887 cached++, n--;
888
889 for (i = 0; i < n; i++)
890 sum += INITIAL_PRIO - cached[i];
891
892 if (n)
893 do_div(sum, n);
894
895 for (i = 0; i < ARRAY_SIZE(q); i++)
896 q[i] = INITIAL_PRIO - cached[n * (i + 1) /
897 (ARRAY_SIZE(q) + 1)];
898
899 vfree(p);
900
901 ret = scnprintf(buf, PAGE_SIZE,
902 "Unused: %zu%%\n"
903 "Clean: %zu%%\n"
904 "Dirty: %zu%%\n"
905 "Metadata: %zu%%\n"
906 "Average: %llu\n"
907 "Sectors per Q: %zu\n"
908 "Quantiles: [",
909 unused * 100 / (size_t) ca->sb.nbuckets,
910 available * 100 / (size_t) ca->sb.nbuckets,
911 dirty * 100 / (size_t) ca->sb.nbuckets,
912 meta * 100 / (size_t) ca->sb.nbuckets, sum,
913 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
914
915 for (i = 0; i < ARRAY_SIZE(q); i++)
916 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
917 "%u ", q[i]);
918 ret--;
919
920 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n");
921
922 return ret;
923 }
924
925 return 0;
926}
927SHOW_LOCKED(bch_cache)
928
929STORE(__bch_cache)
930{
931 struct cache *ca = container_of(kobj, struct cache, kobj);
932
933 if (attr == &sysfs_discard) {
934 bool v = strtoul_or_return(buf);
935
936 if (blk_queue_discard(bdev_get_queue(ca->bdev)))
937 ca->discard = v;
938
939 if (v != CACHE_DISCARD(&ca->sb)) {
940 SET_CACHE_DISCARD(&ca->sb, v);
941 bcache_write_super(ca->set);
942 }
943 }
944
945 if (attr == &sysfs_cache_replacement_policy) {
946 ssize_t v = bch_read_string_list(buf, cache_replacement_policies);
947
948 if (v < 0)
949 return v;
950
951 if ((unsigned) v != CACHE_REPLACEMENT(&ca->sb)) {
952 mutex_lock(&ca->set->bucket_lock);
953 SET_CACHE_REPLACEMENT(&ca->sb, v);
954 mutex_unlock(&ca->set->bucket_lock);
955
956 bcache_write_super(ca->set);
957 }
958 }
959
960 if (attr == &sysfs_clear_stats) {
961 atomic_long_set(&ca->sectors_written, 0);
962 atomic_long_set(&ca->btree_sectors_written, 0);
963 atomic_long_set(&ca->meta_sectors_written, 0);
964 atomic_set(&ca->io_count, 0);
965 atomic_set(&ca->io_errors, 0);
966 }
967
968 return size;
969}
970STORE_LOCKED(bch_cache)
971
972static struct attribute *bch_cache_files[] = {
973 &sysfs_bucket_size,
974 &sysfs_block_size,
975 &sysfs_nbuckets,
976 &sysfs_priority_stats,
977 &sysfs_discard,
978 &sysfs_written,
979 &sysfs_btree_written,
980 &sysfs_metadata_written,
981 &sysfs_io_errors,
982 &sysfs_clear_stats,
983 &sysfs_cache_replacement_policy,
984 NULL
985};
986KTYPE(bch_cache);