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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
19
20static const char * const bch_cache_modes[] = {
21 "writethrough",
22 "writeback",
23 "writearound",
24 "none",
25 NULL
26};
27
28
29static const char * const bch_stop_on_failure_modes[] = {
30 "auto",
31 "always",
32 NULL
33};
34
35static const char * const cache_replacement_policies[] = {
36 "lru",
37 "fifo",
38 "random",
39 NULL
40};
41
42static const char * const error_actions[] = {
43 "unregister",
44 "panic",
45 NULL
46};
47
48write_attribute(attach);
49write_attribute(detach);
50write_attribute(unregister);
51write_attribute(stop);
52write_attribute(clear_stats);
53write_attribute(trigger_gc);
54write_attribute(prune_cache);
55write_attribute(flash_vol_create);
56
57read_attribute(bucket_size);
58read_attribute(block_size);
59read_attribute(nbuckets);
60read_attribute(tree_depth);
61read_attribute(root_usage_percent);
62read_attribute(priority_stats);
63read_attribute(btree_cache_size);
64read_attribute(btree_cache_max_chain);
65read_attribute(cache_available_percent);
66read_attribute(written);
67read_attribute(btree_written);
68read_attribute(metadata_written);
69read_attribute(active_journal_entries);
70
71sysfs_time_stats_attribute(btree_gc, sec, ms);
72sysfs_time_stats_attribute(btree_split, sec, us);
73sysfs_time_stats_attribute(btree_sort, ms, us);
74sysfs_time_stats_attribute(btree_read, ms, us);
75
76read_attribute(btree_nodes);
77read_attribute(btree_used_percent);
78read_attribute(average_key_size);
79read_attribute(dirty_data);
80read_attribute(bset_tree_stats);
81
82read_attribute(state);
83read_attribute(cache_read_races);
84read_attribute(reclaim);
85read_attribute(flush_write);
86read_attribute(retry_flush_write);
87read_attribute(writeback_keys_done);
88read_attribute(writeback_keys_failed);
89read_attribute(io_errors);
90read_attribute(congested);
91rw_attribute(congested_read_threshold_us);
92rw_attribute(congested_write_threshold_us);
93
94rw_attribute(sequential_cutoff);
95rw_attribute(data_csum);
96rw_attribute(cache_mode);
97rw_attribute(stop_when_cache_set_failed);
98rw_attribute(writeback_metadata);
99rw_attribute(writeback_running);
100rw_attribute(writeback_percent);
101rw_attribute(writeback_delay);
102rw_attribute(writeback_rate);
103
104rw_attribute(writeback_rate_update_seconds);
105rw_attribute(writeback_rate_i_term_inverse);
106rw_attribute(writeback_rate_p_term_inverse);
107rw_attribute(writeback_rate_minimum);
108read_attribute(writeback_rate_debug);
109
110read_attribute(stripe_size);
111read_attribute(partial_stripes_expensive);
112
113rw_attribute(synchronous);
114rw_attribute(journal_delay_ms);
115rw_attribute(io_disable);
116rw_attribute(discard);
117rw_attribute(running);
118rw_attribute(label);
119rw_attribute(readahead);
120rw_attribute(errors);
121rw_attribute(io_error_limit);
122rw_attribute(io_error_halflife);
123rw_attribute(verify);
124rw_attribute(bypass_torture_test);
125rw_attribute(key_merging_disabled);
126rw_attribute(gc_always_rewrite);
127rw_attribute(expensive_debug_checks);
128rw_attribute(cache_replacement_policy);
129rw_attribute(btree_shrinker_disabled);
130rw_attribute(copy_gc_enabled);
131rw_attribute(size);
132
133static ssize_t bch_snprint_string_list(char *buf,
134 size_t size,
135 const char * const list[],
136 size_t selected)
137{
138 char *out = buf;
139 size_t i;
140
141 for (i = 0; list[i]; i++)
142 out += snprintf(out, buf + size - out,
143 i == selected ? "[%s] " : "%s ", list[i]);
144
145 out[-1] = '\n';
146 return out - buf;
147}
148
149SHOW(__bch_cached_dev)
150{
151 struct cached_dev *dc = container_of(kobj, struct cached_dev,
152 disk.kobj);
153 char const *states[] = { "no cache", "clean", "dirty", "inconsistent" };
154 int wb = dc->writeback_running;
155
156#define var(stat) (dc->stat)
157
158 if (attr == &sysfs_cache_mode)
159 return bch_snprint_string_list(buf, PAGE_SIZE,
160 bch_cache_modes,
161 BDEV_CACHE_MODE(&dc->sb));
162
163 if (attr == &sysfs_stop_when_cache_set_failed)
164 return bch_snprint_string_list(buf, PAGE_SIZE,
165 bch_stop_on_failure_modes,
166 dc->stop_when_cache_set_failed);
167
168
169 sysfs_printf(data_csum, "%i", dc->disk.data_csum);
170 var_printf(verify, "%i");
171 var_printf(bypass_torture_test, "%i");
172 var_printf(writeback_metadata, "%i");
173 var_printf(writeback_running, "%i");
174 var_print(writeback_delay);
175 var_print(writeback_percent);
176 sysfs_hprint(writeback_rate,
177 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 : 0);
178 sysfs_hprint(io_errors, atomic_read(&dc->io_errors));
179 sysfs_printf(io_error_limit, "%i", dc->error_limit);
180 sysfs_printf(io_disable, "%i", dc->io_disable);
181 var_print(writeback_rate_update_seconds);
182 var_print(writeback_rate_i_term_inverse);
183 var_print(writeback_rate_p_term_inverse);
184 var_print(writeback_rate_minimum);
185
186 if (attr == &sysfs_writeback_rate_debug) {
187 char rate[20];
188 char dirty[20];
189 char target[20];
190 char proportional[20];
191 char integral[20];
192 char change[20];
193 s64 next_io;
194
195
196
197
198
199 bch_hprint(rate,
200 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9
201 : 0);
202 bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9);
203 bch_hprint(target, dc->writeback_rate_target << 9);
204 bch_hprint(proportional,
205 wb ? dc->writeback_rate_proportional << 9 : 0);
206 bch_hprint(integral,
207 wb ? dc->writeback_rate_integral_scaled << 9 : 0);
208 bch_hprint(change, wb ? dc->writeback_rate_change << 9 : 0);
209 next_io = wb ? div64_s64(dc->writeback_rate.next-local_clock(),
210 NSEC_PER_MSEC) : 0;
211
212 return sprintf(buf,
213 "rate:\t\t%s/sec\n"
214 "dirty:\t\t%s\n"
215 "target:\t\t%s\n"
216 "proportional:\t%s\n"
217 "integral:\t%s\n"
218 "change:\t\t%s/sec\n"
219 "next io:\t%llims\n",
220 rate, dirty, target, proportional,
221 integral, change, next_io);
222 }
223
224 sysfs_hprint(dirty_data,
225 bcache_dev_sectors_dirty(&dc->disk) << 9);
226
227 sysfs_hprint(stripe_size, ((uint64_t)dc->disk.stripe_size) << 9);
228 var_printf(partial_stripes_expensive, "%u");
229
230 var_hprint(sequential_cutoff);
231 var_hprint(readahead);
232
233 sysfs_print(running, atomic_read(&dc->running));
234 sysfs_print(state, states[BDEV_STATE(&dc->sb)]);
235
236 if (attr == &sysfs_label) {
237 memcpy(buf, dc->sb.label, SB_LABEL_SIZE);
238 buf[SB_LABEL_SIZE + 1] = '\0';
239 strcat(buf, "\n");
240 return strlen(buf);
241 }
242
243#undef var
244 return 0;
245}
246SHOW_LOCKED(bch_cached_dev)
247
248STORE(__cached_dev)
249{
250 struct cached_dev *dc = container_of(kobj, struct cached_dev,
251 disk.kobj);
252 ssize_t v;
253 struct cache_set *c;
254 struct kobj_uevent_env *env;
255
256#define d_strtoul(var) sysfs_strtoul(var, dc->var)
257#define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX)
258#define d_strtoi_h(var) sysfs_hatoi(var, dc->var)
259
260 sysfs_strtoul(data_csum, dc->disk.data_csum);
261 d_strtoul(verify);
262 d_strtoul(bypass_torture_test);
263 d_strtoul(writeback_metadata);
264 d_strtoul(writeback_running);
265 d_strtoul(writeback_delay);
266
267 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40);
268
269 if (attr == &sysfs_writeback_rate) {
270 ssize_t ret;
271 long int v = atomic_long_read(&dc->writeback_rate.rate);
272
273 ret = strtoul_safe_clamp(buf, v, 1, INT_MAX);
274
275 if (!ret) {
276 atomic_long_set(&dc->writeback_rate.rate, v);
277 ret = size;
278 }
279
280 return ret;
281 }
282
283 sysfs_strtoul_clamp(writeback_rate_update_seconds,
284 dc->writeback_rate_update_seconds,
285 1, WRITEBACK_RATE_UPDATE_SECS_MAX);
286 d_strtoul(writeback_rate_i_term_inverse);
287 d_strtoul_nonzero(writeback_rate_p_term_inverse);
288
289 sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX);
290
291 if (attr == &sysfs_io_disable) {
292 int v = strtoul_or_return(buf);
293
294 dc->io_disable = v ? 1 : 0;
295 }
296
297 d_strtoi_h(sequential_cutoff);
298 d_strtoi_h(readahead);
299
300 if (attr == &sysfs_clear_stats)
301 bch_cache_accounting_clear(&dc->accounting);
302
303 if (attr == &sysfs_running &&
304 strtoul_or_return(buf))
305 bch_cached_dev_run(dc);
306
307 if (attr == &sysfs_cache_mode) {
308 v = __sysfs_match_string(bch_cache_modes, -1, buf);
309 if (v < 0)
310 return v;
311
312 if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) {
313 SET_BDEV_CACHE_MODE(&dc->sb, v);
314 bch_write_bdev_super(dc, NULL);
315 }
316 }
317
318 if (attr == &sysfs_stop_when_cache_set_failed) {
319 v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf);
320 if (v < 0)
321 return v;
322
323 dc->stop_when_cache_set_failed = v;
324 }
325
326 if (attr == &sysfs_label) {
327 if (size > SB_LABEL_SIZE)
328 return -EINVAL;
329 memcpy(dc->sb.label, buf, size);
330 if (size < SB_LABEL_SIZE)
331 dc->sb.label[size] = '\0';
332 if (size && dc->sb.label[size - 1] == '\n')
333 dc->sb.label[size - 1] = '\0';
334 bch_write_bdev_super(dc, NULL);
335 if (dc->disk.c) {
336 memcpy(dc->disk.c->uuids[dc->disk.id].label,
337 buf, SB_LABEL_SIZE);
338 bch_uuid_write(dc->disk.c);
339 }
340 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
341 if (!env)
342 return -ENOMEM;
343 add_uevent_var(env, "DRIVER=bcache");
344 add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid),
345 add_uevent_var(env, "CACHED_LABEL=%s", buf);
346 kobject_uevent_env(&disk_to_dev(dc->disk.disk)->kobj,
347 KOBJ_CHANGE,
348 env->envp);
349 kfree(env);
350 }
351
352 if (attr == &sysfs_attach) {
353 uint8_t set_uuid[16];
354
355 if (bch_parse_uuid(buf, set_uuid) < 16)
356 return -EINVAL;
357
358 v = -ENOENT;
359 list_for_each_entry(c, &bch_cache_sets, list) {
360 v = bch_cached_dev_attach(dc, c, set_uuid);
361 if (!v)
362 return size;
363 }
364 if (v == -ENOENT)
365 pr_err("Can't attach %s: cache set not found", buf);
366 return v;
367 }
368
369 if (attr == &sysfs_detach && dc->disk.c)
370 bch_cached_dev_detach(dc);
371
372 if (attr == &sysfs_stop)
373 bcache_device_stop(&dc->disk);
374
375 return size;
376}
377
378STORE(bch_cached_dev)
379{
380 struct cached_dev *dc = container_of(kobj, struct cached_dev,
381 disk.kobj);
382
383 mutex_lock(&bch_register_lock);
384 size = __cached_dev_store(kobj, attr, buf, size);
385
386 if (attr == &sysfs_writeback_running)
387 bch_writeback_queue(dc);
388
389 if (attr == &sysfs_writeback_percent)
390 if (!test_and_set_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags))
391 schedule_delayed_work(&dc->writeback_rate_update,
392 dc->writeback_rate_update_seconds * HZ);
393
394 mutex_unlock(&bch_register_lock);
395 return size;
396}
397
398static struct attribute *bch_cached_dev_files[] = {
399 &sysfs_attach,
400 &sysfs_detach,
401 &sysfs_stop,
402#if 0
403 &sysfs_data_csum,
404#endif
405 &sysfs_cache_mode,
406 &sysfs_stop_when_cache_set_failed,
407 &sysfs_writeback_metadata,
408 &sysfs_writeback_running,
409 &sysfs_writeback_delay,
410 &sysfs_writeback_percent,
411 &sysfs_writeback_rate,
412 &sysfs_writeback_rate_update_seconds,
413 &sysfs_writeback_rate_i_term_inverse,
414 &sysfs_writeback_rate_p_term_inverse,
415 &sysfs_writeback_rate_debug,
416 &sysfs_errors,
417 &sysfs_io_error_limit,
418 &sysfs_io_disable,
419 &sysfs_dirty_data,
420 &sysfs_stripe_size,
421 &sysfs_partial_stripes_expensive,
422 &sysfs_sequential_cutoff,
423 &sysfs_clear_stats,
424 &sysfs_running,
425 &sysfs_state,
426 &sysfs_label,
427 &sysfs_readahead,
428#ifdef CONFIG_BCACHE_DEBUG
429 &sysfs_verify,
430 &sysfs_bypass_torture_test,
431#endif
432 NULL
433};
434KTYPE(bch_cached_dev);
435
436SHOW(bch_flash_dev)
437{
438 struct bcache_device *d = container_of(kobj, struct bcache_device,
439 kobj);
440 struct uuid_entry *u = &d->c->uuids[d->id];
441
442 sysfs_printf(data_csum, "%i", d->data_csum);
443 sysfs_hprint(size, u->sectors << 9);
444
445 if (attr == &sysfs_label) {
446 memcpy(buf, u->label, SB_LABEL_SIZE);
447 buf[SB_LABEL_SIZE + 1] = '\0';
448 strcat(buf, "\n");
449 return strlen(buf);
450 }
451
452 return 0;
453}
454
455STORE(__bch_flash_dev)
456{
457 struct bcache_device *d = container_of(kobj, struct bcache_device,
458 kobj);
459 struct uuid_entry *u = &d->c->uuids[d->id];
460
461 sysfs_strtoul(data_csum, d->data_csum);
462
463 if (attr == &sysfs_size) {
464 uint64_t v;
465
466 strtoi_h_or_return(buf, v);
467
468 u->sectors = v >> 9;
469 bch_uuid_write(d->c);
470 set_capacity(d->disk, u->sectors);
471 }
472
473 if (attr == &sysfs_label) {
474 memcpy(u->label, buf, SB_LABEL_SIZE);
475 bch_uuid_write(d->c);
476 }
477
478 if (attr == &sysfs_unregister) {
479 set_bit(BCACHE_DEV_DETACHING, &d->flags);
480 bcache_device_stop(d);
481 }
482
483 return size;
484}
485STORE_LOCKED(bch_flash_dev)
486
487static struct attribute *bch_flash_dev_files[] = {
488 &sysfs_unregister,
489#if 0
490 &sysfs_data_csum,
491#endif
492 &sysfs_label,
493 &sysfs_size,
494 NULL
495};
496KTYPE(bch_flash_dev);
497
498struct bset_stats_op {
499 struct btree_op op;
500 size_t nodes;
501 struct bset_stats stats;
502};
503
504static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b)
505{
506 struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op);
507
508 op->nodes++;
509 bch_btree_keys_stats(&b->keys, &op->stats);
510
511 return MAP_CONTINUE;
512}
513
514static int bch_bset_print_stats(struct cache_set *c, char *buf)
515{
516 struct bset_stats_op op;
517 int ret;
518
519 memset(&op, 0, sizeof(op));
520 bch_btree_op_init(&op.op, -1);
521
522 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats);
523 if (ret < 0)
524 return ret;
525
526 return snprintf(buf, PAGE_SIZE,
527 "btree nodes: %zu\n"
528 "written sets: %zu\n"
529 "unwritten sets: %zu\n"
530 "written key bytes: %zu\n"
531 "unwritten key bytes: %zu\n"
532 "floats: %zu\n"
533 "failed: %zu\n",
534 op.nodes,
535 op.stats.sets_written, op.stats.sets_unwritten,
536 op.stats.bytes_written, op.stats.bytes_unwritten,
537 op.stats.floats, op.stats.failed);
538}
539
540static unsigned int bch_root_usage(struct cache_set *c)
541{
542 unsigned int bytes = 0;
543 struct bkey *k;
544 struct btree *b;
545 struct btree_iter iter;
546
547 goto lock_root;
548
549 do {
550 rw_unlock(false, b);
551lock_root:
552 b = c->root;
553 rw_lock(false, b, b->level);
554 } while (b != c->root);
555
556 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad)
557 bytes += bkey_bytes(k);
558
559 rw_unlock(false, b);
560
561 return (bytes * 100) / btree_bytes(c);
562}
563
564static size_t bch_cache_size(struct cache_set *c)
565{
566 size_t ret = 0;
567 struct btree *b;
568
569 mutex_lock(&c->bucket_lock);
570 list_for_each_entry(b, &c->btree_cache, list)
571 ret += 1 << (b->keys.page_order + PAGE_SHIFT);
572
573 mutex_unlock(&c->bucket_lock);
574 return ret;
575}
576
577static unsigned int bch_cache_max_chain(struct cache_set *c)
578{
579 unsigned int ret = 0;
580 struct hlist_head *h;
581
582 mutex_lock(&c->bucket_lock);
583
584 for (h = c->bucket_hash;
585 h < c->bucket_hash + (1 << BUCKET_HASH_BITS);
586 h++) {
587 unsigned int i = 0;
588 struct hlist_node *p;
589
590 hlist_for_each(p, h)
591 i++;
592
593 ret = max(ret, i);
594 }
595
596 mutex_unlock(&c->bucket_lock);
597 return ret;
598}
599
600static unsigned int bch_btree_used(struct cache_set *c)
601{
602 return div64_u64(c->gc_stats.key_bytes * 100,
603 (c->gc_stats.nodes ?: 1) * btree_bytes(c));
604}
605
606static unsigned int bch_average_key_size(struct cache_set *c)
607{
608 return c->gc_stats.nkeys
609 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys)
610 : 0;
611}
612
613SHOW(__bch_cache_set)
614{
615 struct cache_set *c = container_of(kobj, struct cache_set, kobj);
616
617 sysfs_print(synchronous, CACHE_SYNC(&c->sb));
618 sysfs_print(journal_delay_ms, c->journal_delay_ms);
619 sysfs_hprint(bucket_size, bucket_bytes(c));
620 sysfs_hprint(block_size, block_bytes(c));
621 sysfs_print(tree_depth, c->root->level);
622 sysfs_print(root_usage_percent, bch_root_usage(c));
623
624 sysfs_hprint(btree_cache_size, bch_cache_size(c));
625 sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c));
626 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use);
627
628 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms);
629 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us);
630 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us);
631 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us);
632
633 sysfs_print(btree_used_percent, bch_btree_used(c));
634 sysfs_print(btree_nodes, c->gc_stats.nodes);
635 sysfs_hprint(average_key_size, bch_average_key_size(c));
636
637 sysfs_print(cache_read_races,
638 atomic_long_read(&c->cache_read_races));
639
640 sysfs_print(reclaim,
641 atomic_long_read(&c->reclaim));
642
643 sysfs_print(flush_write,
644 atomic_long_read(&c->flush_write));
645
646 sysfs_print(retry_flush_write,
647 atomic_long_read(&c->retry_flush_write));
648
649 sysfs_print(writeback_keys_done,
650 atomic_long_read(&c->writeback_keys_done));
651 sysfs_print(writeback_keys_failed,
652 atomic_long_read(&c->writeback_keys_failed));
653
654 if (attr == &sysfs_errors)
655 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions,
656 c->on_error);
657
658
659 sysfs_print(io_error_halflife, c->error_decay * 88);
660 sysfs_print(io_error_limit, c->error_limit);
661
662 sysfs_hprint(congested,
663 ((uint64_t) bch_get_congested(c)) << 9);
664 sysfs_print(congested_read_threshold_us,
665 c->congested_read_threshold_us);
666 sysfs_print(congested_write_threshold_us,
667 c->congested_write_threshold_us);
668
669 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin));
670 sysfs_printf(verify, "%i", c->verify);
671 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled);
672 sysfs_printf(expensive_debug_checks,
673 "%i", c->expensive_debug_checks);
674 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite);
675 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled);
676 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled);
677 sysfs_printf(io_disable, "%i",
678 test_bit(CACHE_SET_IO_DISABLE, &c->flags));
679
680 if (attr == &sysfs_bset_tree_stats)
681 return bch_bset_print_stats(c, buf);
682
683 return 0;
684}
685SHOW_LOCKED(bch_cache_set)
686
687STORE(__bch_cache_set)
688{
689 struct cache_set *c = container_of(kobj, struct cache_set, kobj);
690 ssize_t v;
691
692 if (attr == &sysfs_unregister)
693 bch_cache_set_unregister(c);
694
695 if (attr == &sysfs_stop)
696 bch_cache_set_stop(c);
697
698 if (attr == &sysfs_synchronous) {
699 bool sync = strtoul_or_return(buf);
700
701 if (sync != CACHE_SYNC(&c->sb)) {
702 SET_CACHE_SYNC(&c->sb, sync);
703 bcache_write_super(c);
704 }
705 }
706
707 if (attr == &sysfs_flash_vol_create) {
708 int r;
709 uint64_t v;
710
711 strtoi_h_or_return(buf, v);
712
713 r = bch_flash_dev_create(c, v);
714 if (r)
715 return r;
716 }
717
718 if (attr == &sysfs_clear_stats) {
719 atomic_long_set(&c->writeback_keys_done, 0);
720 atomic_long_set(&c->writeback_keys_failed, 0);
721
722 memset(&c->gc_stats, 0, sizeof(struct gc_stat));
723 bch_cache_accounting_clear(&c->accounting);
724 }
725
726 if (attr == &sysfs_trigger_gc) {
727
728
729
730
731
732
733
734
735
736
737
738 atomic_set(&c->sectors_to_gc, -1);
739 wake_up_gc(c);
740 }
741
742 if (attr == &sysfs_prune_cache) {
743 struct shrink_control sc;
744
745 sc.gfp_mask = GFP_KERNEL;
746 sc.nr_to_scan = strtoul_or_return(buf);
747 c->shrink.scan_objects(&c->shrink, &sc);
748 }
749
750 sysfs_strtoul(congested_read_threshold_us,
751 c->congested_read_threshold_us);
752 sysfs_strtoul(congested_write_threshold_us,
753 c->congested_write_threshold_us);
754
755 if (attr == &sysfs_errors) {
756 v = __sysfs_match_string(error_actions, -1, buf);
757 if (v < 0)
758 return v;
759
760 c->on_error = v;
761 }
762
763 if (attr == &sysfs_io_error_limit)
764 c->error_limit = strtoul_or_return(buf);
765
766
767 if (attr == &sysfs_io_error_halflife)
768 c->error_decay = strtoul_or_return(buf) / 88;
769
770 if (attr == &sysfs_io_disable) {
771 v = strtoul_or_return(buf);
772 if (v) {
773 if (test_and_set_bit(CACHE_SET_IO_DISABLE,
774 &c->flags))
775 pr_warn("CACHE_SET_IO_DISABLE already set");
776 } else {
777 if (!test_and_clear_bit(CACHE_SET_IO_DISABLE,
778 &c->flags))
779 pr_warn("CACHE_SET_IO_DISABLE already cleared");
780 }
781 }
782
783 sysfs_strtoul(journal_delay_ms, c->journal_delay_ms);
784 sysfs_strtoul(verify, c->verify);
785 sysfs_strtoul(key_merging_disabled, c->key_merging_disabled);
786 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks);
787 sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite);
788 sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled);
789 sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled);
790
791 return size;
792}
793STORE_LOCKED(bch_cache_set)
794
795SHOW(bch_cache_set_internal)
796{
797 struct cache_set *c = container_of(kobj, struct cache_set, internal);
798
799 return bch_cache_set_show(&c->kobj, attr, buf);
800}
801
802STORE(bch_cache_set_internal)
803{
804 struct cache_set *c = container_of(kobj, struct cache_set, internal);
805
806 return bch_cache_set_store(&c->kobj, attr, buf, size);
807}
808
809static void bch_cache_set_internal_release(struct kobject *k)
810{
811}
812
813static struct attribute *bch_cache_set_files[] = {
814 &sysfs_unregister,
815 &sysfs_stop,
816 &sysfs_synchronous,
817 &sysfs_journal_delay_ms,
818 &sysfs_flash_vol_create,
819
820 &sysfs_bucket_size,
821 &sysfs_block_size,
822 &sysfs_tree_depth,
823 &sysfs_root_usage_percent,
824 &sysfs_btree_cache_size,
825 &sysfs_cache_available_percent,
826
827 &sysfs_average_key_size,
828
829 &sysfs_errors,
830 &sysfs_io_error_limit,
831 &sysfs_io_error_halflife,
832 &sysfs_congested,
833 &sysfs_congested_read_threshold_us,
834 &sysfs_congested_write_threshold_us,
835 &sysfs_clear_stats,
836 NULL
837};
838KTYPE(bch_cache_set);
839
840static struct attribute *bch_cache_set_internal_files[] = {
841 &sysfs_active_journal_entries,
842
843 sysfs_time_stats_attribute_list(btree_gc, sec, ms)
844 sysfs_time_stats_attribute_list(btree_split, sec, us)
845 sysfs_time_stats_attribute_list(btree_sort, ms, us)
846 sysfs_time_stats_attribute_list(btree_read, ms, us)
847
848 &sysfs_btree_nodes,
849 &sysfs_btree_used_percent,
850 &sysfs_btree_cache_max_chain,
851
852 &sysfs_bset_tree_stats,
853 &sysfs_cache_read_races,
854 &sysfs_reclaim,
855 &sysfs_flush_write,
856 &sysfs_retry_flush_write,
857 &sysfs_writeback_keys_done,
858 &sysfs_writeback_keys_failed,
859
860 &sysfs_trigger_gc,
861 &sysfs_prune_cache,
862#ifdef CONFIG_BCACHE_DEBUG
863 &sysfs_verify,
864 &sysfs_key_merging_disabled,
865 &sysfs_expensive_debug_checks,
866#endif
867 &sysfs_gc_always_rewrite,
868 &sysfs_btree_shrinker_disabled,
869 &sysfs_copy_gc_enabled,
870 &sysfs_io_disable,
871 NULL
872};
873KTYPE(bch_cache_set_internal);
874
875static int __bch_cache_cmp(const void *l, const void *r)
876{
877 return *((uint16_t *)r) - *((uint16_t *)l);
878}
879
880SHOW(__bch_cache)
881{
882 struct cache *ca = container_of(kobj, struct cache, kobj);
883
884 sysfs_hprint(bucket_size, bucket_bytes(ca));
885 sysfs_hprint(block_size, block_bytes(ca));
886 sysfs_print(nbuckets, ca->sb.nbuckets);
887 sysfs_print(discard, ca->discard);
888 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9);
889 sysfs_hprint(btree_written,
890 atomic_long_read(&ca->btree_sectors_written) << 9);
891 sysfs_hprint(metadata_written,
892 (atomic_long_read(&ca->meta_sectors_written) +
893 atomic_long_read(&ca->btree_sectors_written)) << 9);
894
895 sysfs_print(io_errors,
896 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT);
897
898 if (attr == &sysfs_cache_replacement_policy)
899 return bch_snprint_string_list(buf, PAGE_SIZE,
900 cache_replacement_policies,
901 CACHE_REPLACEMENT(&ca->sb));
902
903 if (attr == &sysfs_priority_stats) {
904 struct bucket *b;
905 size_t n = ca->sb.nbuckets, i;
906 size_t unused = 0, available = 0, dirty = 0, meta = 0;
907 uint64_t sum = 0;
908
909 uint16_t q[31], *p, *cached;
910 ssize_t ret;
911
912 cached = p = vmalloc(array_size(sizeof(uint16_t),
913 ca->sb.nbuckets));
914 if (!p)
915 return -ENOMEM;
916
917 mutex_lock(&ca->set->bucket_lock);
918 for_each_bucket(b, ca) {
919 if (!GC_SECTORS_USED(b))
920 unused++;
921 if (GC_MARK(b) == GC_MARK_RECLAIMABLE)
922 available++;
923 if (GC_MARK(b) == GC_MARK_DIRTY)
924 dirty++;
925 if (GC_MARK(b) == GC_MARK_METADATA)
926 meta++;
927 }
928
929 for (i = ca->sb.first_bucket; i < n; i++)
930 p[i] = ca->buckets[i].prio;
931 mutex_unlock(&ca->set->bucket_lock);
932
933 sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL);
934
935 while (n &&
936 !cached[n - 1])
937 --n;
938
939 unused = ca->sb.nbuckets - n;
940
941 while (cached < p + n &&
942 *cached == BTREE_PRIO)
943 cached++, n--;
944
945 for (i = 0; i < n; i++)
946 sum += INITIAL_PRIO - cached[i];
947
948 if (n)
949 do_div(sum, n);
950
951 for (i = 0; i < ARRAY_SIZE(q); i++)
952 q[i] = INITIAL_PRIO - cached[n * (i + 1) /
953 (ARRAY_SIZE(q) + 1)];
954
955 vfree(p);
956
957 ret = scnprintf(buf, PAGE_SIZE,
958 "Unused: %zu%%\n"
959 "Clean: %zu%%\n"
960 "Dirty: %zu%%\n"
961 "Metadata: %zu%%\n"
962 "Average: %llu\n"
963 "Sectors per Q: %zu\n"
964 "Quantiles: [",
965 unused * 100 / (size_t) ca->sb.nbuckets,
966 available * 100 / (size_t) ca->sb.nbuckets,
967 dirty * 100 / (size_t) ca->sb.nbuckets,
968 meta * 100 / (size_t) ca->sb.nbuckets, sum,
969 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
970
971 for (i = 0; i < ARRAY_SIZE(q); i++)
972 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
973 "%u ", q[i]);
974 ret--;
975
976 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n");
977
978 return ret;
979 }
980
981 return 0;
982}
983SHOW_LOCKED(bch_cache)
984
985STORE(__bch_cache)
986{
987 struct cache *ca = container_of(kobj, struct cache, kobj);
988 ssize_t v;
989
990 if (attr == &sysfs_discard) {
991 bool v = strtoul_or_return(buf);
992
993 if (blk_queue_discard(bdev_get_queue(ca->bdev)))
994 ca->discard = v;
995
996 if (v != CACHE_DISCARD(&ca->sb)) {
997 SET_CACHE_DISCARD(&ca->sb, v);
998 bcache_write_super(ca->set);
999 }
1000 }
1001
1002 if (attr == &sysfs_cache_replacement_policy) {
1003 v = __sysfs_match_string(cache_replacement_policies, -1, buf);
1004 if (v < 0)
1005 return v;
1006
1007 if ((unsigned int) v != CACHE_REPLACEMENT(&ca->sb)) {
1008 mutex_lock(&ca->set->bucket_lock);
1009 SET_CACHE_REPLACEMENT(&ca->sb, v);
1010 mutex_unlock(&ca->set->bucket_lock);
1011
1012 bcache_write_super(ca->set);
1013 }
1014 }
1015
1016 if (attr == &sysfs_clear_stats) {
1017 atomic_long_set(&ca->sectors_written, 0);
1018 atomic_long_set(&ca->btree_sectors_written, 0);
1019 atomic_long_set(&ca->meta_sectors_written, 0);
1020 atomic_set(&ca->io_count, 0);
1021 atomic_set(&ca->io_errors, 0);
1022 }
1023
1024 return size;
1025}
1026STORE_LOCKED(bch_cache)
1027
1028static struct attribute *bch_cache_files[] = {
1029 &sysfs_bucket_size,
1030 &sysfs_block_size,
1031 &sysfs_nbuckets,
1032 &sysfs_priority_stats,
1033 &sysfs_discard,
1034 &sysfs_written,
1035 &sysfs_btree_written,
1036 &sysfs_metadata_written,
1037 &sysfs_io_errors,
1038 &sysfs_clear_stats,
1039 &sysfs_cache_replacement_policy,
1040 NULL
1041};
1042KTYPE(bch_cache);
1043
