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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
19extern bool bcache_is_reboot;
20
21
22static const char * const bch_cache_modes[] = {
23 "writethrough",
24 "writeback",
25 "writearound",
26 "none",
27 NULL
28};
29
30
31static const char * const bch_stop_on_failure_modes[] = {
32 "auto",
33 "always",
34 NULL
35};
36
37static const char * const cache_replacement_policies[] = {
38 "lru",
39 "fifo",
40 "random",
41 NULL
42};
43
44static const char * const error_actions[] = {
45 "unregister",
46 "panic",
47 NULL
48};
49
50write_attribute(attach);
51write_attribute(detach);
52write_attribute(unregister);
53write_attribute(stop);
54write_attribute(clear_stats);
55write_attribute(trigger_gc);
56write_attribute(prune_cache);
57write_attribute(flash_vol_create);
58
59read_attribute(bucket_size);
60read_attribute(block_size);
61read_attribute(nbuckets);
62read_attribute(tree_depth);
63read_attribute(root_usage_percent);
64read_attribute(priority_stats);
65read_attribute(btree_cache_size);
66read_attribute(btree_cache_max_chain);
67read_attribute(cache_available_percent);
68read_attribute(written);
69read_attribute(btree_written);
70read_attribute(metadata_written);
71read_attribute(active_journal_entries);
72read_attribute(backing_dev_name);
73read_attribute(backing_dev_uuid);
74
75sysfs_time_stats_attribute(btree_gc, sec, ms);
76sysfs_time_stats_attribute(btree_split, sec, us);
77sysfs_time_stats_attribute(btree_sort, ms, us);
78sysfs_time_stats_attribute(btree_read, ms, us);
79
80read_attribute(btree_nodes);
81read_attribute(btree_used_percent);
82read_attribute(average_key_size);
83read_attribute(dirty_data);
84read_attribute(bset_tree_stats);
85
86read_attribute(state);
87read_attribute(cache_read_races);
88read_attribute(reclaim);
89read_attribute(reclaimed_journal_buckets);
90read_attribute(flush_write);
91read_attribute(writeback_keys_done);
92read_attribute(writeback_keys_failed);
93read_attribute(io_errors);
94read_attribute(congested);
95read_attribute(cutoff_writeback);
96read_attribute(cutoff_writeback_sync);
97rw_attribute(congested_read_threshold_us);
98rw_attribute(congested_write_threshold_us);
99
100rw_attribute(sequential_cutoff);
101rw_attribute(data_csum);
102rw_attribute(cache_mode);
103rw_attribute(stop_when_cache_set_failed);
104rw_attribute(writeback_metadata);
105rw_attribute(writeback_running);
106rw_attribute(writeback_percent);
107rw_attribute(writeback_delay);
108rw_attribute(writeback_rate);
109
110rw_attribute(writeback_rate_update_seconds);
111rw_attribute(writeback_rate_i_term_inverse);
112rw_attribute(writeback_rate_p_term_inverse);
113rw_attribute(writeback_rate_minimum);
114read_attribute(writeback_rate_debug);
115
116read_attribute(stripe_size);
117read_attribute(partial_stripes_expensive);
118
119rw_attribute(synchronous);
120rw_attribute(journal_delay_ms);
121rw_attribute(io_disable);
122rw_attribute(discard);
123rw_attribute(running);
124rw_attribute(label);
125rw_attribute(readahead);
126rw_attribute(errors);
127rw_attribute(io_error_limit);
128rw_attribute(io_error_halflife);
129rw_attribute(verify);
130rw_attribute(bypass_torture_test);
131rw_attribute(key_merging_disabled);
132rw_attribute(gc_always_rewrite);
133rw_attribute(expensive_debug_checks);
134rw_attribute(cache_replacement_policy);
135rw_attribute(btree_shrinker_disabled);
136rw_attribute(copy_gc_enabled);
137rw_attribute(gc_after_writeback);
138rw_attribute(size);
139
140static ssize_t bch_snprint_string_list(char *buf,
141 size_t size,
142 const char * const list[],
143 size_t selected)
144{
145 char *out = buf;
146 size_t i;
147
148 for (i = 0; list[i]; i++)
149 out += snprintf(out, buf + size - out,
150 i == selected ? "[%s] " : "%s ", list[i]);
151
152 out[-1] = '\n';
153 return out - buf;
154}
155
156SHOW(__bch_cached_dev)
157{
158 struct cached_dev *dc = container_of(kobj, struct cached_dev,
159 disk.kobj);
160 char const *states[] = { "no cache", "clean", "dirty", "inconsistent" };
161 int wb = dc->writeback_running;
162
163#define var(stat) (dc->stat)
164
165 if (attr == &sysfs_cache_mode)
166 return bch_snprint_string_list(buf, PAGE_SIZE,
167 bch_cache_modes,
168 BDEV_CACHE_MODE(&dc->sb));
169
170 if (attr == &sysfs_stop_when_cache_set_failed)
171 return bch_snprint_string_list(buf, PAGE_SIZE,
172 bch_stop_on_failure_modes,
173 dc->stop_when_cache_set_failed);
174
175
176 sysfs_printf(data_csum, "%i", dc->disk.data_csum);
177 var_printf(verify, "%i");
178 var_printf(bypass_torture_test, "%i");
179 var_printf(writeback_metadata, "%i");
180 var_printf(writeback_running, "%i");
181 var_print(writeback_delay);
182 var_print(writeback_percent);
183 sysfs_hprint(writeback_rate,
184 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 : 0);
185 sysfs_printf(io_errors, "%i", atomic_read(&dc->io_errors));
186 sysfs_printf(io_error_limit, "%i", dc->error_limit);
187 sysfs_printf(io_disable, "%i", dc->io_disable);
188 var_print(writeback_rate_update_seconds);
189 var_print(writeback_rate_i_term_inverse);
190 var_print(writeback_rate_p_term_inverse);
191 var_print(writeback_rate_minimum);
192
193 if (attr == &sysfs_writeback_rate_debug) {
194 char rate[20];
195 char dirty[20];
196 char target[20];
197 char proportional[20];
198 char integral[20];
199 char change[20];
200 s64 next_io;
201
202
203
204
205
206 bch_hprint(rate,
207 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9
208 : 0);
209 bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9);
210 bch_hprint(target, dc->writeback_rate_target << 9);
211 bch_hprint(proportional,
212 wb ? dc->writeback_rate_proportional << 9 : 0);
213 bch_hprint(integral,
214 wb ? dc->writeback_rate_integral_scaled << 9 : 0);
215 bch_hprint(change, wb ? dc->writeback_rate_change << 9 : 0);
216 next_io = wb ? div64_s64(dc->writeback_rate.next-local_clock(),
217 NSEC_PER_MSEC) : 0;
218
219 return sprintf(buf,
220 "rate:\t\t%s/sec\n"
221 "dirty:\t\t%s\n"
222 "target:\t\t%s\n"
223 "proportional:\t%s\n"
224 "integral:\t%s\n"
225 "change:\t\t%s/sec\n"
226 "next io:\t%llims\n",
227 rate, dirty, target, proportional,
228 integral, change, next_io);
229 }
230
231 sysfs_hprint(dirty_data,
232 bcache_dev_sectors_dirty(&dc->disk) << 9);
233
234 sysfs_hprint(stripe_size, ((uint64_t)dc->disk.stripe_size) << 9);
235 var_printf(partial_stripes_expensive, "%u");
236
237 var_hprint(sequential_cutoff);
238 var_hprint(readahead);
239
240 sysfs_print(running, atomic_read(&dc->running));
241 sysfs_print(state, states[BDEV_STATE(&dc->sb)]);
242
243 if (attr == &sysfs_label) {
244 memcpy(buf, dc->sb.label, SB_LABEL_SIZE);
245 buf[SB_LABEL_SIZE + 1] = '\0';
246 strcat(buf, "\n");
247 return strlen(buf);
248 }
249
250 if (attr == &sysfs_backing_dev_name) {
251 snprintf(buf, BDEVNAME_SIZE + 1, "%s", dc->backing_dev_name);
252 strcat(buf, "\n");
253 return strlen(buf);
254 }
255
256 if (attr == &sysfs_backing_dev_uuid) {
257
258 snprintf(buf, 36+1, "%pU", dc->sb.uuid);
259 strcat(buf, "\n");
260 return strlen(buf);
261 }
262
263#undef var
264 return 0;
265}
266SHOW_LOCKED(bch_cached_dev)
267
268STORE(__cached_dev)
269{
270 struct cached_dev *dc = container_of(kobj, struct cached_dev,
271 disk.kobj);
272 ssize_t v;
273 struct cache_set *c;
274 struct kobj_uevent_env *env;
275
276
277 if (bcache_is_reboot)
278 return -EBUSY;
279
280#define d_strtoul(var) sysfs_strtoul(var, dc->var)
281#define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX)
282#define d_strtoi_h(var) sysfs_hatoi(var, dc->var)
283
284 sysfs_strtoul(data_csum, dc->disk.data_csum);
285 d_strtoul(verify);
286 sysfs_strtoul_bool(bypass_torture_test, dc->bypass_torture_test);
287 sysfs_strtoul_bool(writeback_metadata, dc->writeback_metadata);
288 sysfs_strtoul_bool(writeback_running, dc->writeback_running);
289 sysfs_strtoul_clamp(writeback_delay, dc->writeback_delay, 0, UINT_MAX);
290
291 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent,
292 0, bch_cutoff_writeback);
293
294 if (attr == &sysfs_writeback_rate) {
295 ssize_t ret;
296 long int v = atomic_long_read(&dc->writeback_rate.rate);
297
298 ret = strtoul_safe_clamp(buf, v, 1, INT_MAX);
299
300 if (!ret) {
301 atomic_long_set(&dc->writeback_rate.rate, v);
302 ret = size;
303 }
304
305 return ret;
306 }
307
308 sysfs_strtoul_clamp(writeback_rate_update_seconds,
309 dc->writeback_rate_update_seconds,
310 1, WRITEBACK_RATE_UPDATE_SECS_MAX);
311 sysfs_strtoul_clamp(writeback_rate_i_term_inverse,
312 dc->writeback_rate_i_term_inverse,
313 1, UINT_MAX);
314 sysfs_strtoul_clamp(writeback_rate_p_term_inverse,
315 dc->writeback_rate_p_term_inverse,
316 1, UINT_MAX);
317 sysfs_strtoul_clamp(writeback_rate_minimum,
318 dc->writeback_rate_minimum,
319 1, UINT_MAX);
320
321 sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX);
322
323 if (attr == &sysfs_io_disable) {
324 int v = strtoul_or_return(buf);
325
326 dc->io_disable = v ? 1 : 0;
327 }
328
329 sysfs_strtoul_clamp(sequential_cutoff,
330 dc->sequential_cutoff,
331 0, UINT_MAX);
332 d_strtoi_h(readahead);
333
334 if (attr == &sysfs_clear_stats)
335 bch_cache_accounting_clear(&dc->accounting);
336
337 if (attr == &sysfs_running &&
338 strtoul_or_return(buf)) {
339 v = bch_cached_dev_run(dc);
340 if (v)
341 return v;
342 }
343
344 if (attr == &sysfs_cache_mode) {
345 v = __sysfs_match_string(bch_cache_modes, -1, buf);
346 if (v < 0)
347 return v;
348
349 if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) {
350 SET_BDEV_CACHE_MODE(&dc->sb, v);
351 bch_write_bdev_super(dc, NULL);
352 }
353 }
354
355 if (attr == &sysfs_stop_when_cache_set_failed) {
356 v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf);
357 if (v < 0)
358 return v;
359
360 dc->stop_when_cache_set_failed = v;
361 }
362
363 if (attr == &sysfs_label) {
364 if (size > SB_LABEL_SIZE)
365 return -EINVAL;
366 memcpy(dc->sb.label, buf, size);
367 if (size < SB_LABEL_SIZE)
368 dc->sb.label[size] = '\0';
369 if (size && dc->sb.label[size - 1] == '\n')
370 dc->sb.label[size - 1] = '\0';
371 bch_write_bdev_super(dc, NULL);
372 if (dc->disk.c) {
373 memcpy(dc->disk.c->uuids[dc->disk.id].label,
374 buf, SB_LABEL_SIZE);
375 bch_uuid_write(dc->disk.c);
376 }
377 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
378 if (!env)
379 return -ENOMEM;
380 add_uevent_var(env, "DRIVER=bcache");
381 add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid),
382 add_uevent_var(env, "CACHED_LABEL=%s", buf);
383 kobject_uevent_env(&disk_to_dev(dc->disk.disk)->kobj,
384 KOBJ_CHANGE,
385 env->envp);
386 kfree(env);
387 }
388
389 if (attr == &sysfs_attach) {
390 uint8_t set_uuid[16];
391
392 if (bch_parse_uuid(buf, set_uuid) < 16)
393 return -EINVAL;
394
395 v = -ENOENT;
396 list_for_each_entry(c, &bch_cache_sets, list) {
397 v = bch_cached_dev_attach(dc, c, set_uuid);
398 if (!v)
399 return size;
400 }
401 if (v == -ENOENT)
402 pr_err("Can't attach %s: cache set not found", buf);
403 return v;
404 }
405
406 if (attr == &sysfs_detach && dc->disk.c)
407 bch_cached_dev_detach(dc);
408
409 if (attr == &sysfs_stop)
410 bcache_device_stop(&dc->disk);
411
412 return size;
413}
414
415STORE(bch_cached_dev)
416{
417 struct cached_dev *dc = container_of(kobj, struct cached_dev,
418 disk.kobj);
419
420
421 if (bcache_is_reboot)
422 return -EBUSY;
423
424 mutex_lock(&bch_register_lock);
425 size = __cached_dev_store(kobj, attr, buf, size);
426
427 if (attr == &sysfs_writeback_running) {
428
429 if (IS_ERR_OR_NULL(dc->writeback_thread)) {
430
431
432
433
434 if (dc->writeback_running) {
435 dc->writeback_running = false;
436 pr_err("%s: failed to run non-existent writeback thread",
437 dc->disk.disk->disk_name);
438 }
439 } else
440
441
442
443
444 bch_writeback_queue(dc);
445 }
446
447
448
449
450
451 if (attr == &sysfs_writeback_percent)
452 if ((dc->disk.c != NULL) &&
453 (!test_and_set_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags)))
454 schedule_delayed_work(&dc->writeback_rate_update,
455 dc->writeback_rate_update_seconds * HZ);
456
457 mutex_unlock(&bch_register_lock);
458 return size;
459}
460
461static struct attribute *bch_cached_dev_files[] = {
462 &sysfs_attach,
463 &sysfs_detach,
464 &sysfs_stop,
465#if 0
466 &sysfs_data_csum,
467#endif
468 &sysfs_cache_mode,
469 &sysfs_stop_when_cache_set_failed,
470 &sysfs_writeback_metadata,
471 &sysfs_writeback_running,
472 &sysfs_writeback_delay,
473 &sysfs_writeback_percent,
474 &sysfs_writeback_rate,
475 &sysfs_writeback_rate_update_seconds,
476 &sysfs_writeback_rate_i_term_inverse,
477 &sysfs_writeback_rate_p_term_inverse,
478 &sysfs_writeback_rate_minimum,
479 &sysfs_writeback_rate_debug,
480 &sysfs_io_errors,
481 &sysfs_io_error_limit,
482 &sysfs_io_disable,
483 &sysfs_dirty_data,
484 &sysfs_stripe_size,
485 &sysfs_partial_stripes_expensive,
486 &sysfs_sequential_cutoff,
487 &sysfs_clear_stats,
488 &sysfs_running,
489 &sysfs_state,
490 &sysfs_label,
491 &sysfs_readahead,
492#ifdef CONFIG_BCACHE_DEBUG
493 &sysfs_verify,
494 &sysfs_bypass_torture_test,
495#endif
496 &sysfs_backing_dev_name,
497 &sysfs_backing_dev_uuid,
498 NULL
499};
500KTYPE(bch_cached_dev);
501
502SHOW(bch_flash_dev)
503{
504 struct bcache_device *d = container_of(kobj, struct bcache_device,
505 kobj);
506 struct uuid_entry *u = &d->c->uuids[d->id];
507
508 sysfs_printf(data_csum, "%i", d->data_csum);
509 sysfs_hprint(size, u->sectors << 9);
510
511 if (attr == &sysfs_label) {
512 memcpy(buf, u->label, SB_LABEL_SIZE);
513 buf[SB_LABEL_SIZE + 1] = '\0';
514 strcat(buf, "\n");
515 return strlen(buf);
516 }
517
518 return 0;
519}
520
521STORE(__bch_flash_dev)
522{
523 struct bcache_device *d = container_of(kobj, struct bcache_device,
524 kobj);
525 struct uuid_entry *u = &d->c->uuids[d->id];
526
527
528 if (bcache_is_reboot)
529 return -EBUSY;
530
531 sysfs_strtoul(data_csum, d->data_csum);
532
533 if (attr == &sysfs_size) {
534 uint64_t v;
535
536 strtoi_h_or_return(buf, v);
537
538 u->sectors = v >> 9;
539 bch_uuid_write(d->c);
540 set_capacity(d->disk, u->sectors);
541 }
542
543 if (attr == &sysfs_label) {
544 memcpy(u->label, buf, SB_LABEL_SIZE);
545 bch_uuid_write(d->c);
546 }
547
548 if (attr == &sysfs_unregister) {
549 set_bit(BCACHE_DEV_DETACHING, &d->flags);
550 bcache_device_stop(d);
551 }
552
553 return size;
554}
555STORE_LOCKED(bch_flash_dev)
556
557static struct attribute *bch_flash_dev_files[] = {
558 &sysfs_unregister,
559#if 0
560 &sysfs_data_csum,
561#endif
562 &sysfs_label,
563 &sysfs_size,
564 NULL
565};
566KTYPE(bch_flash_dev);
567
568struct bset_stats_op {
569 struct btree_op op;
570 size_t nodes;
571 struct bset_stats stats;
572};
573
574static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b)
575{
576 struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op);
577
578 op->nodes++;
579 bch_btree_keys_stats(&b->keys, &op->stats);
580
581 return MAP_CONTINUE;
582}
583
584static int bch_bset_print_stats(struct cache_set *c, char *buf)
585{
586 struct bset_stats_op op;
587 int ret;
588
589 memset(&op, 0, sizeof(op));
590 bch_btree_op_init(&op.op, -1);
591
592 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats);
593 if (ret < 0)
594 return ret;
595
596 return snprintf(buf, PAGE_SIZE,
597 "btree nodes: %zu\n"
598 "written sets: %zu\n"
599 "unwritten sets: %zu\n"
600 "written key bytes: %zu\n"
601 "unwritten key bytes: %zu\n"
602 "floats: %zu\n"
603 "failed: %zu\n",
604 op.nodes,
605 op.stats.sets_written, op.stats.sets_unwritten,
606 op.stats.bytes_written, op.stats.bytes_unwritten,
607 op.stats.floats, op.stats.failed);
608}
609
610static unsigned int bch_root_usage(struct cache_set *c)
611{
612 unsigned int bytes = 0;
613 struct bkey *k;
614 struct btree *b;
615 struct btree_iter iter;
616
617 goto lock_root;
618
619 do {
620 rw_unlock(false, b);
621lock_root:
622 b = c->root;
623 rw_lock(false, b, b->level);
624 } while (b != c->root);
625
626 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad)
627 bytes += bkey_bytes(k);
628
629 rw_unlock(false, b);
630
631 return (bytes * 100) / btree_bytes(c);
632}
633
634static size_t bch_cache_size(struct cache_set *c)
635{
636 size_t ret = 0;
637 struct btree *b;
638
639 mutex_lock(&c->bucket_lock);
640 list_for_each_entry(b, &c->btree_cache, list)
641 ret += 1 << (b->keys.page_order + PAGE_SHIFT);
642
643 mutex_unlock(&c->bucket_lock);
644 return ret;
645}
646
647static unsigned int bch_cache_max_chain(struct cache_set *c)
648{
649 unsigned int ret = 0;
650 struct hlist_head *h;
651
652 mutex_lock(&c->bucket_lock);
653
654 for (h = c->bucket_hash;
655 h < c->bucket_hash + (1 << BUCKET_HASH_BITS);
656 h++) {
657 unsigned int i = 0;
658 struct hlist_node *p;
659
660 hlist_for_each(p, h)
661 i++;
662
663 ret = max(ret, i);
664 }
665
666 mutex_unlock(&c->bucket_lock);
667 return ret;
668}
669
670static unsigned int bch_btree_used(struct cache_set *c)
671{
672 return div64_u64(c->gc_stats.key_bytes * 100,
673 (c->gc_stats.nodes ?: 1) * btree_bytes(c));
674}
675
676static unsigned int bch_average_key_size(struct cache_set *c)
677{
678 return c->gc_stats.nkeys
679 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys)
680 : 0;
681}
682
683SHOW(__bch_cache_set)
684{
685 struct cache_set *c = container_of(kobj, struct cache_set, kobj);
686
687 sysfs_print(synchronous, CACHE_SYNC(&c->sb));
688 sysfs_print(journal_delay_ms, c->journal_delay_ms);
689 sysfs_hprint(bucket_size, bucket_bytes(c));
690 sysfs_hprint(block_size, block_bytes(c));
691 sysfs_print(tree_depth, c->root->level);
692 sysfs_print(root_usage_percent, bch_root_usage(c));
693
694 sysfs_hprint(btree_cache_size, bch_cache_size(c));
695 sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c));
696 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use);
697
698 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms);
699 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us);
700 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us);
701 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us);
702
703 sysfs_print(btree_used_percent, bch_btree_used(c));
704 sysfs_print(btree_nodes, c->gc_stats.nodes);
705 sysfs_hprint(average_key_size, bch_average_key_size(c));
706
707 sysfs_print(cache_read_races,
708 atomic_long_read(&c->cache_read_races));
709
710 sysfs_print(reclaim,
711 atomic_long_read(&c->reclaim));
712
713 sysfs_print(reclaimed_journal_buckets,
714 atomic_long_read(&c->reclaimed_journal_buckets));
715
716 sysfs_print(flush_write,
717 atomic_long_read(&c->flush_write));
718
719 sysfs_print(writeback_keys_done,
720 atomic_long_read(&c->writeback_keys_done));
721 sysfs_print(writeback_keys_failed,
722 atomic_long_read(&c->writeback_keys_failed));
723
724 if (attr == &sysfs_errors)
725 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions,
726 c->on_error);
727
728
729 sysfs_print(io_error_halflife, c->error_decay * 88);
730 sysfs_print(io_error_limit, c->error_limit);
731
732 sysfs_hprint(congested,
733 ((uint64_t) bch_get_congested(c)) << 9);
734 sysfs_print(congested_read_threshold_us,
735 c->congested_read_threshold_us);
736 sysfs_print(congested_write_threshold_us,
737 c->congested_write_threshold_us);
738
739 sysfs_print(cutoff_writeback, bch_cutoff_writeback);
740 sysfs_print(cutoff_writeback_sync, bch_cutoff_writeback_sync);
741
742 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin));
743 sysfs_printf(verify, "%i", c->verify);
744 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled);
745 sysfs_printf(expensive_debug_checks,
746 "%i", c->expensive_debug_checks);
747 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite);
748 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled);
749 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled);
750 sysfs_printf(gc_after_writeback, "%i", c->gc_after_writeback);
751 sysfs_printf(io_disable, "%i",
752 test_bit(CACHE_SET_IO_DISABLE, &c->flags));
753
754 if (attr == &sysfs_bset_tree_stats)
755 return bch_bset_print_stats(c, buf);
756
757 return 0;
758}
759SHOW_LOCKED(bch_cache_set)
760
761STORE(__bch_cache_set)
762{
763 struct cache_set *c = container_of(kobj, struct cache_set, kobj);
764 ssize_t v;
765
766
767 if (bcache_is_reboot)
768 return -EBUSY;
769
770 if (attr == &sysfs_unregister)
771 bch_cache_set_unregister(c);
772
773 if (attr == &sysfs_stop)
774 bch_cache_set_stop(c);
775
776 if (attr == &sysfs_synchronous) {
777 bool sync = strtoul_or_return(buf);
778
779 if (sync != CACHE_SYNC(&c->sb)) {
780 SET_CACHE_SYNC(&c->sb, sync);
781 bcache_write_super(c);
782 }
783 }
784
785 if (attr == &sysfs_flash_vol_create) {
786 int r;
787 uint64_t v;
788
789 strtoi_h_or_return(buf, v);
790
791 r = bch_flash_dev_create(c, v);
792 if (r)
793 return r;
794 }
795
796 if (attr == &sysfs_clear_stats) {
797 atomic_long_set(&c->writeback_keys_done, 0);
798 atomic_long_set(&c->writeback_keys_failed, 0);
799
800 memset(&c->gc_stats, 0, sizeof(struct gc_stat));
801 bch_cache_accounting_clear(&c->accounting);
802 }
803
804 if (attr == &sysfs_trigger_gc)
805 force_wake_up_gc(c);
806
807 if (attr == &sysfs_prune_cache) {
808 struct shrink_control sc;
809
810 sc.gfp_mask = GFP_KERNEL;
811 sc.nr_to_scan = strtoul_or_return(buf);
812 c->shrink.scan_objects(&c->shrink, &sc);
813 }
814
815 sysfs_strtoul_clamp(congested_read_threshold_us,
816 c->congested_read_threshold_us,
817 0, UINT_MAX);
818 sysfs_strtoul_clamp(congested_write_threshold_us,
819 c->congested_write_threshold_us,
820 0, UINT_MAX);
821
822 if (attr == &sysfs_errors) {
823 v = __sysfs_match_string(error_actions, -1, buf);
824 if (v < 0)
825 return v;
826
827 c->on_error = v;
828 }
829
830 sysfs_strtoul_clamp(io_error_limit, c->error_limit, 0, UINT_MAX);
831
832
833 if (attr == &sysfs_io_error_halflife) {
834 unsigned long v = 0;
835 ssize_t ret;
836
837 ret = strtoul_safe_clamp(buf, v, 0, UINT_MAX);
838 if (!ret) {
839 c->error_decay = v / 88;
840 return size;
841 }
842 return ret;
843 }
844
845 if (attr == &sysfs_io_disable) {
846 v = strtoul_or_return(buf);
847 if (v) {
848 if (test_and_set_bit(CACHE_SET_IO_DISABLE,
849 &c->flags))
850 pr_warn("CACHE_SET_IO_DISABLE already set");
851 } else {
852 if (!test_and_clear_bit(CACHE_SET_IO_DISABLE,
853 &c->flags))
854 pr_warn("CACHE_SET_IO_DISABLE already cleared");
855 }
856 }
857
858 sysfs_strtoul_clamp(journal_delay_ms,
859 c->journal_delay_ms,
860 0, USHRT_MAX);
861 sysfs_strtoul_bool(verify, c->verify);
862 sysfs_strtoul_bool(key_merging_disabled, c->key_merging_disabled);
863 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks);
864 sysfs_strtoul_bool(gc_always_rewrite, c->gc_always_rewrite);
865 sysfs_strtoul_bool(btree_shrinker_disabled, c->shrinker_disabled);
866 sysfs_strtoul_bool(copy_gc_enabled, c->copy_gc_enabled);
867
868
869
870
871
872 sysfs_strtoul_clamp(gc_after_writeback, c->gc_after_writeback, 0, 1);
873
874 return size;
875}
876STORE_LOCKED(bch_cache_set)
877
878SHOW(bch_cache_set_internal)
879{
880 struct cache_set *c = container_of(kobj, struct cache_set, internal);
881
882 return bch_cache_set_show(&c->kobj, attr, buf);
883}
884
885STORE(bch_cache_set_internal)
886{
887 struct cache_set *c = container_of(kobj, struct cache_set, internal);
888
889
890 if (bcache_is_reboot)
891 return -EBUSY;
892
893 return bch_cache_set_store(&c->kobj, attr, buf, size);
894}
895
896static void bch_cache_set_internal_release(struct kobject *k)
897{
898}
899
900static struct attribute *bch_cache_set_files[] = {
901 &sysfs_unregister,
902 &sysfs_stop,
903 &sysfs_synchronous,
904 &sysfs_journal_delay_ms,
905 &sysfs_flash_vol_create,
906
907 &sysfs_bucket_size,
908 &sysfs_block_size,
909 &sysfs_tree_depth,
910 &sysfs_root_usage_percent,
911 &sysfs_btree_cache_size,
912 &sysfs_cache_available_percent,
913
914 &sysfs_average_key_size,
915
916 &sysfs_errors,
917 &sysfs_io_error_limit,
918 &sysfs_io_error_halflife,
919 &sysfs_congested,
920 &sysfs_congested_read_threshold_us,
921 &sysfs_congested_write_threshold_us,
922 &sysfs_clear_stats,
923 NULL
924};
925KTYPE(bch_cache_set);
926
927static struct attribute *bch_cache_set_internal_files[] = {
928 &sysfs_active_journal_entries,
929
930 sysfs_time_stats_attribute_list(btree_gc, sec, ms)
931 sysfs_time_stats_attribute_list(btree_split, sec, us)
932 sysfs_time_stats_attribute_list(btree_sort, ms, us)
933 sysfs_time_stats_attribute_list(btree_read, ms, us)
934
935 &sysfs_btree_nodes,
936 &sysfs_btree_used_percent,
937 &sysfs_btree_cache_max_chain,
938
939 &sysfs_bset_tree_stats,
940 &sysfs_cache_read_races,
941 &sysfs_reclaim,
942 &sysfs_reclaimed_journal_buckets,
943 &sysfs_flush_write,
944 &sysfs_writeback_keys_done,
945 &sysfs_writeback_keys_failed,
946
947 &sysfs_trigger_gc,
948 &sysfs_prune_cache,
949#ifdef CONFIG_BCACHE_DEBUG
950 &sysfs_verify,
951 &sysfs_key_merging_disabled,
952 &sysfs_expensive_debug_checks,
953#endif
954 &sysfs_gc_always_rewrite,
955 &sysfs_btree_shrinker_disabled,
956 &sysfs_copy_gc_enabled,
957 &sysfs_gc_after_writeback,
958 &sysfs_io_disable,
959 &sysfs_cutoff_writeback,
960 &sysfs_cutoff_writeback_sync,
961 NULL
962};
963KTYPE(bch_cache_set_internal);
964
965static int __bch_cache_cmp(const void *l, const void *r)
966{
967 return *((uint16_t *)r) - *((uint16_t *)l);
968}
969
970SHOW(__bch_cache)
971{
972 struct cache *ca = container_of(kobj, struct cache, kobj);
973
974 sysfs_hprint(bucket_size, bucket_bytes(ca));
975 sysfs_hprint(block_size, block_bytes(ca));
976 sysfs_print(nbuckets, ca->sb.nbuckets);
977 sysfs_print(discard, ca->discard);
978 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9);
979 sysfs_hprint(btree_written,
980 atomic_long_read(&ca->btree_sectors_written) << 9);
981 sysfs_hprint(metadata_written,
982 (atomic_long_read(&ca->meta_sectors_written) +
983 atomic_long_read(&ca->btree_sectors_written)) << 9);
984
985 sysfs_print(io_errors,
986 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT);
987
988 if (attr == &sysfs_cache_replacement_policy)
989 return bch_snprint_string_list(buf, PAGE_SIZE,
990 cache_replacement_policies,
991 CACHE_REPLACEMENT(&ca->sb));
992
993 if (attr == &sysfs_priority_stats) {
994 struct bucket *b;
995 size_t n = ca->sb.nbuckets, i;
996 size_t unused = 0, available = 0, dirty = 0, meta = 0;
997 uint64_t sum = 0;
998
999 uint16_t q[31], *p, *cached;
1000 ssize_t ret;
1001
1002 cached = p = vmalloc(array_size(sizeof(uint16_t),
1003 ca->sb.nbuckets));
1004 if (!p)
1005 return -ENOMEM;
1006
1007 mutex_lock(&ca->set->bucket_lock);
1008 for_each_bucket(b, ca) {
1009 if (!GC_SECTORS_USED(b))
1010 unused++;
1011 if (GC_MARK(b) == GC_MARK_RECLAIMABLE)
1012 available++;
1013 if (GC_MARK(b) == GC_MARK_DIRTY)
1014 dirty++;
1015 if (GC_MARK(b) == GC_MARK_METADATA)
1016 meta++;
1017 }
1018
1019 for (i = ca->sb.first_bucket; i < n; i++)
1020 p[i] = ca->buckets[i].prio;
1021 mutex_unlock(&ca->set->bucket_lock);
1022
1023 sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL);
1024
1025 while (n &&
1026 !cached[n - 1])
1027 --n;
1028
1029 while (cached < p + n &&
1030 *cached == BTREE_PRIO)
1031 cached++, n--;
1032
1033 for (i = 0; i < n; i++)
1034 sum += INITIAL_PRIO - cached[i];
1035
1036 if (n)
1037 do_div(sum, n);
1038
1039 for (i = 0; i < ARRAY_SIZE(q); i++)
1040 q[i] = INITIAL_PRIO - cached[n * (i + 1) /
1041 (ARRAY_SIZE(q) + 1)];
1042
1043 vfree(p);
1044
1045 ret = scnprintf(buf, PAGE_SIZE,
1046 "Unused: %zu%%\n"
1047 "Clean: %zu%%\n"
1048 "Dirty: %zu%%\n"
1049 "Metadata: %zu%%\n"
1050 "Average: %llu\n"
1051 "Sectors per Q: %zu\n"
1052 "Quantiles: [",
1053 unused * 100 / (size_t) ca->sb.nbuckets,
1054 available * 100 / (size_t) ca->sb.nbuckets,
1055 dirty * 100 / (size_t) ca->sb.nbuckets,
1056 meta * 100 / (size_t) ca->sb.nbuckets, sum,
1057 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
1058
1059 for (i = 0; i < ARRAY_SIZE(q); i++)
1060 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
1061 "%u ", q[i]);
1062 ret--;
1063
1064 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n");
1065
1066 return ret;
1067 }
1068
1069 return 0;
1070}
1071SHOW_LOCKED(bch_cache)
1072
1073STORE(__bch_cache)
1074{
1075 struct cache *ca = container_of(kobj, struct cache, kobj);
1076 ssize_t v;
1077
1078
1079 if (bcache_is_reboot)
1080 return -EBUSY;
1081
1082 if (attr == &sysfs_discard) {
1083 bool v = strtoul_or_return(buf);
1084
1085 if (blk_queue_discard(bdev_get_queue(ca->bdev)))
1086 ca->discard = v;
1087
1088 if (v != CACHE_DISCARD(&ca->sb)) {
1089 SET_CACHE_DISCARD(&ca->sb, v);
1090 bcache_write_super(ca->set);
1091 }
1092 }
1093
1094 if (attr == &sysfs_cache_replacement_policy) {
1095 v = __sysfs_match_string(cache_replacement_policies, -1, buf);
1096 if (v < 0)
1097 return v;
1098
1099 if ((unsigned int) v != CACHE_REPLACEMENT(&ca->sb)) {
1100 mutex_lock(&ca->set->bucket_lock);
1101 SET_CACHE_REPLACEMENT(&ca->sb, v);
1102 mutex_unlock(&ca->set->bucket_lock);
1103
1104 bcache_write_super(ca->set);
1105 }
1106 }
1107
1108 if (attr == &sysfs_clear_stats) {
1109 atomic_long_set(&ca->sectors_written, 0);
1110 atomic_long_set(&ca->btree_sectors_written, 0);
1111 atomic_long_set(&ca->meta_sectors_written, 0);
1112 atomic_set(&ca->io_count, 0);
1113 atomic_set(&ca->io_errors, 0);
1114 }
1115
1116 return size;
1117}
1118STORE_LOCKED(bch_cache)
1119
1120static struct attribute *bch_cache_files[] = {
1121 &sysfs_bucket_size,
1122 &sysfs_block_size,
1123 &sysfs_nbuckets,
1124 &sysfs_priority_stats,
1125 &sysfs_discard,
1126 &sysfs_written,
1127 &sysfs_btree_written,
1128 &sysfs_metadata_written,
1129 &sysfs_io_errors,
1130 &sysfs_clear_stats,
1131 &sysfs_cache_replacement_policy,
1132 NULL
1133};
1134KTYPE(bch_cache);
1135
