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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#include "features.h"
15
16#include <linux/blkdev.h>
17#include <linux/sort.h>
18#include <linux/sched/clock.h>
19
20extern bool bcache_is_reboot;
21
22/* Default is 0 ("writethrough") */
23static const char * const bch_cache_modes[] = {
24 "writethrough",
25 "writeback",
26 "writearound",
27 "none",
28 NULL
29};
30
31static const char * const bch_reada_cache_policies[] = {
32 "all",
33 "meta-only",
34 NULL
35};
36
37/* Default is 0 ("auto") */
38static const char * const bch_stop_on_failure_modes[] = {
39 "auto",
40 "always",
41 NULL
42};
43
44static const char * const cache_replacement_policies[] = {
45 "lru",
46 "fifo",
47 "random",
48 NULL
49};
50
51static const char * const error_actions[] = {
52 "unregister",
53 "panic",
54 NULL
55};
56
57write_attribute(attach);
58write_attribute(detach);
59write_attribute(unregister);
60write_attribute(stop);
61write_attribute(clear_stats);
62write_attribute(trigger_gc);
63write_attribute(prune_cache);
64write_attribute(flash_vol_create);
65
66read_attribute(bucket_size);
67read_attribute(block_size);
68read_attribute(nbuckets);
69read_attribute(tree_depth);
70read_attribute(root_usage_percent);
71read_attribute(priority_stats);
72read_attribute(btree_cache_size);
73read_attribute(btree_cache_max_chain);
74read_attribute(cache_available_percent);
75read_attribute(written);
76read_attribute(btree_written);
77read_attribute(metadata_written);
78read_attribute(active_journal_entries);
79read_attribute(backing_dev_name);
80read_attribute(backing_dev_uuid);
81
82sysfs_time_stats_attribute(btree_gc, sec, ms);
83sysfs_time_stats_attribute(btree_split, sec, us);
84sysfs_time_stats_attribute(btree_sort, ms, us);
85sysfs_time_stats_attribute(btree_read, ms, us);
86
87read_attribute(btree_nodes);
88read_attribute(btree_used_percent);
89read_attribute(average_key_size);
90read_attribute(dirty_data);
91read_attribute(bset_tree_stats);
92read_attribute(feature_compat);
93read_attribute(feature_ro_compat);
94read_attribute(feature_incompat);
95
96read_attribute(state);
97read_attribute(cache_read_races);
98read_attribute(reclaim);
99read_attribute(reclaimed_journal_buckets);
100read_attribute(flush_write);
101read_attribute(writeback_keys_done);
102read_attribute(writeback_keys_failed);
103read_attribute(io_errors);
104read_attribute(congested);
105read_attribute(cutoff_writeback);
106read_attribute(cutoff_writeback_sync);
107rw_attribute(congested_read_threshold_us);
108rw_attribute(congested_write_threshold_us);
109
110rw_attribute(sequential_cutoff);
111rw_attribute(data_csum);
112rw_attribute(cache_mode);
113rw_attribute(readahead_cache_policy);
114rw_attribute(stop_when_cache_set_failed);
115rw_attribute(writeback_metadata);
116rw_attribute(writeback_running);
117rw_attribute(writeback_percent);
118rw_attribute(writeback_delay);
119rw_attribute(writeback_rate);
120rw_attribute(writeback_consider_fragment);
121
122rw_attribute(writeback_rate_update_seconds);
123rw_attribute(writeback_rate_i_term_inverse);
124rw_attribute(writeback_rate_p_term_inverse);
125rw_attribute(writeback_rate_fp_term_low);
126rw_attribute(writeback_rate_fp_term_mid);
127rw_attribute(writeback_rate_fp_term_high);
128rw_attribute(writeback_rate_minimum);
129read_attribute(writeback_rate_debug);
130
131read_attribute(stripe_size);
132read_attribute(partial_stripes_expensive);
133
134rw_attribute(synchronous);
135rw_attribute(journal_delay_ms);
136rw_attribute(io_disable);
137rw_attribute(discard);
138rw_attribute(running);
139rw_attribute(label);
140rw_attribute(errors);
141rw_attribute(io_error_limit);
142rw_attribute(io_error_halflife);
143rw_attribute(verify);
144rw_attribute(bypass_torture_test);
145rw_attribute(key_merging_disabled);
146rw_attribute(gc_always_rewrite);
147rw_attribute(expensive_debug_checks);
148rw_attribute(cache_replacement_policy);
149rw_attribute(btree_shrinker_disabled);
150rw_attribute(copy_gc_enabled);
151rw_attribute(idle_max_writeback_rate);
152rw_attribute(gc_after_writeback);
153rw_attribute(size);
154
155static ssize_t bch_snprint_string_list(char *buf,
156 size_t size,
157 const char * const list[],
158 size_t selected)
159{
160 char *out = buf;
161 size_t i;
162
163 for (i = 0; list[i]; i++)
164 out += scnprintf(out, buf + size - out,
165 i == selected ? "[%s] " : "%s ", list[i]);
166
167 out[-1] = '\n';
168 return out - buf;
169}
170
171SHOW(__bch_cached_dev)
172{
173 struct cached_dev *dc = container_of(kobj, struct cached_dev,
174 disk.kobj);
175 char const *states[] = { "no cache", "clean", "dirty", "inconsistent" };
176 int wb = dc->writeback_running;
177
178#define var(stat) (dc->stat)
179
180 if (attr == &sysfs_cache_mode)
181 return bch_snprint_string_list(buf, PAGE_SIZE,
182 bch_cache_modes,
183 BDEV_CACHE_MODE(&dc->sb));
184
185 if (attr == &sysfs_readahead_cache_policy)
186 return bch_snprint_string_list(buf, PAGE_SIZE,
187 bch_reada_cache_policies,
188 dc->cache_readahead_policy);
189
190 if (attr == &sysfs_stop_when_cache_set_failed)
191 return bch_snprint_string_list(buf, PAGE_SIZE,
192 bch_stop_on_failure_modes,
193 dc->stop_when_cache_set_failed);
194
195
196 sysfs_printf(data_csum, "%i", dc->disk.data_csum);
197 var_printf(verify, "%i");
198 var_printf(bypass_torture_test, "%i");
199 var_printf(writeback_metadata, "%i");
200 var_printf(writeback_running, "%i");
201 var_printf(writeback_consider_fragment, "%i");
202 var_print(writeback_delay);
203 var_print(writeback_percent);
204 sysfs_hprint(writeback_rate,
205 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 : 0);
206 sysfs_printf(io_errors, "%i", atomic_read(&dc->io_errors));
207 sysfs_printf(io_error_limit, "%i", dc->error_limit);
208 sysfs_printf(io_disable, "%i", dc->io_disable);
209 var_print(writeback_rate_update_seconds);
210 var_print(writeback_rate_i_term_inverse);
211 var_print(writeback_rate_p_term_inverse);
212 var_print(writeback_rate_fp_term_low);
213 var_print(writeback_rate_fp_term_mid);
214 var_print(writeback_rate_fp_term_high);
215 var_print(writeback_rate_minimum);
216
217 if (attr == &sysfs_writeback_rate_debug) {
218 char rate[20];
219 char dirty[20];
220 char target[20];
221 char proportional[20];
222 char integral[20];
223 char change[20];
224 s64 next_io;
225
226 /*
227 * Except for dirty and target, other values should
228 * be 0 if writeback is not running.
229 */
230 bch_hprint(rate,
231 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9
232 : 0);
233 bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9);
234 bch_hprint(target, dc->writeback_rate_target << 9);
235 bch_hprint(proportional,
236 wb ? dc->writeback_rate_proportional << 9 : 0);
237 bch_hprint(integral,
238 wb ? dc->writeback_rate_integral_scaled << 9 : 0);
239 bch_hprint(change, wb ? dc->writeback_rate_change << 9 : 0);
240 next_io = wb ? div64_s64(dc->writeback_rate.next-local_clock(),
241 NSEC_PER_MSEC) : 0;
242
243 return sprintf(buf,
244 "rate:\t\t%s/sec\n"
245 "dirty:\t\t%s\n"
246 "target:\t\t%s\n"
247 "proportional:\t%s\n"
248 "integral:\t%s\n"
249 "change:\t\t%s/sec\n"
250 "next io:\t%llims\n",
251 rate, dirty, target, proportional,
252 integral, change, next_io);
253 }
254
255 sysfs_hprint(dirty_data,
256 bcache_dev_sectors_dirty(&dc->disk) << 9);
257
258 sysfs_hprint(stripe_size, ((uint64_t)dc->disk.stripe_size) << 9);
259 var_printf(partial_stripes_expensive, "%u");
260
261 var_hprint(sequential_cutoff);
262
263 sysfs_print(running, atomic_read(&dc->running));
264 sysfs_print(state, states[BDEV_STATE(&dc->sb)]);
265
266 if (attr == &sysfs_label) {
267 memcpy(buf, dc->sb.label, SB_LABEL_SIZE);
268 buf[SB_LABEL_SIZE + 1] = '\0';
269 strcat(buf, "\n");
270 return strlen(buf);
271 }
272
273 if (attr == &sysfs_backing_dev_name) {
274 snprintf(buf, BDEVNAME_SIZE + 1, "%pg", dc->bdev);
275 strcat(buf, "\n");
276 return strlen(buf);
277 }
278
279 if (attr == &sysfs_backing_dev_uuid) {
280 /* convert binary uuid into 36-byte string plus '\0' */
281 snprintf(buf, 36+1, "%pU", dc->sb.uuid);
282 strcat(buf, "\n");
283 return strlen(buf);
284 }
285
286#undef var
287 return 0;
288}
289SHOW_LOCKED(bch_cached_dev)
290
291STORE(__cached_dev)
292{
293 struct cached_dev *dc = container_of(kobj, struct cached_dev,
294 disk.kobj);
295 ssize_t v;
296 struct cache_set *c;
297 struct kobj_uevent_env *env;
298
299 /* no user space access if system is rebooting */
300 if (bcache_is_reboot)
301 return -EBUSY;
302
303#define d_strtoul(var) sysfs_strtoul(var, dc->var)
304#define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX)
305#define d_strtoi_h(var) sysfs_hatoi(var, dc->var)
306
307 sysfs_strtoul(data_csum, dc->disk.data_csum);
308 d_strtoul(verify);
309 sysfs_strtoul_bool(bypass_torture_test, dc->bypass_torture_test);
310 sysfs_strtoul_bool(writeback_metadata, dc->writeback_metadata);
311 sysfs_strtoul_bool(writeback_running, dc->writeback_running);
312 sysfs_strtoul_bool(writeback_consider_fragment, dc->writeback_consider_fragment);
313 sysfs_strtoul_clamp(writeback_delay, dc->writeback_delay, 0, UINT_MAX);
314
315 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent,
316 0, bch_cutoff_writeback);
317
318 if (attr == &sysfs_writeback_rate) {
319 ssize_t ret;
320 long int v = atomic_long_read(&dc->writeback_rate.rate);
321
322 ret = strtoul_safe_clamp(buf, v, 1, INT_MAX);
323
324 if (!ret) {
325 atomic_long_set(&dc->writeback_rate.rate, v);
326 ret = size;
327 }
328
329 return ret;
330 }
331
332 sysfs_strtoul_clamp(writeback_rate_update_seconds,
333 dc->writeback_rate_update_seconds,
334 1, WRITEBACK_RATE_UPDATE_SECS_MAX);
335 sysfs_strtoul_clamp(writeback_rate_i_term_inverse,
336 dc->writeback_rate_i_term_inverse,
337 1, UINT_MAX);
338 sysfs_strtoul_clamp(writeback_rate_p_term_inverse,
339 dc->writeback_rate_p_term_inverse,
340 1, UINT_MAX);
341 sysfs_strtoul_clamp(writeback_rate_fp_term_low,
342 dc->writeback_rate_fp_term_low,
343 1, dc->writeback_rate_fp_term_mid - 1);
344 sysfs_strtoul_clamp(writeback_rate_fp_term_mid,
345 dc->writeback_rate_fp_term_mid,
346 dc->writeback_rate_fp_term_low + 1,
347 dc->writeback_rate_fp_term_high - 1);
348 sysfs_strtoul_clamp(writeback_rate_fp_term_high,
349 dc->writeback_rate_fp_term_high,
350 dc->writeback_rate_fp_term_mid + 1, UINT_MAX);
351 sysfs_strtoul_clamp(writeback_rate_minimum,
352 dc->writeback_rate_minimum,
353 1, UINT_MAX);
354
355 sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX);
356
357 if (attr == &sysfs_io_disable) {
358 int v = strtoul_or_return(buf);
359
360 dc->io_disable = v ? 1 : 0;
361 }
362
363 sysfs_strtoul_clamp(sequential_cutoff,
364 dc->sequential_cutoff,
365 0, UINT_MAX);
366
367 if (attr == &sysfs_clear_stats)
368 bch_cache_accounting_clear(&dc->accounting);
369
370 if (attr == &sysfs_running &&
371 strtoul_or_return(buf)) {
372 v = bch_cached_dev_run(dc);
373 if (v)
374 return v;
375 }
376
377 if (attr == &sysfs_cache_mode) {
378 v = __sysfs_match_string(bch_cache_modes, -1, buf);
379 if (v < 0)
380 return v;
381
382 if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) {
383 SET_BDEV_CACHE_MODE(&dc->sb, v);
384 bch_write_bdev_super(dc, NULL);
385 }
386 }
387
388 if (attr == &sysfs_readahead_cache_policy) {
389 v = __sysfs_match_string(bch_reada_cache_policies, -1, buf);
390 if (v < 0)
391 return v;
392
393 if ((unsigned int) v != dc->cache_readahead_policy)
394 dc->cache_readahead_policy = v;
395 }
396
397 if (attr == &sysfs_stop_when_cache_set_failed) {
398 v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf);
399 if (v < 0)
400 return v;
401
402 dc->stop_when_cache_set_failed = v;
403 }
404
405 if (attr == &sysfs_label) {
406 if (size > SB_LABEL_SIZE)
407 return -EINVAL;
408 memcpy(dc->sb.label, buf, size);
409 if (size < SB_LABEL_SIZE)
410 dc->sb.label[size] = '\0';
411 if (size && dc->sb.label[size - 1] == '\n')
412 dc->sb.label[size - 1] = '\0';
413 bch_write_bdev_super(dc, NULL);
414 if (dc->disk.c) {
415 memcpy(dc->disk.c->uuids[dc->disk.id].label,
416 buf, SB_LABEL_SIZE);
417 bch_uuid_write(dc->disk.c);
418 }
419 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
420 if (!env)
421 return -ENOMEM;
422 add_uevent_var(env, "DRIVER=bcache");
423 add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid);
424 add_uevent_var(env, "CACHED_LABEL=%s", buf);
425 kobject_uevent_env(&disk_to_dev(dc->disk.disk)->kobj,
426 KOBJ_CHANGE,
427 env->envp);
428 kfree(env);
429 }
430
431 if (attr == &sysfs_attach) {
432 uint8_t set_uuid[16];
433
434 if (bch_parse_uuid(buf, set_uuid) < 16)
435 return -EINVAL;
436
437 v = -ENOENT;
438 list_for_each_entry(c, &bch_cache_sets, list) {
439 v = bch_cached_dev_attach(dc, c, set_uuid);
440 if (!v)
441 return size;
442 }
443 if (v == -ENOENT)
444 pr_err("Can't attach %s: cache set not found\n", buf);
445 return v;
446 }
447
448 if (attr == &sysfs_detach && dc->disk.c)
449 bch_cached_dev_detach(dc);
450
451 if (attr == &sysfs_stop)
452 bcache_device_stop(&dc->disk);
453
454 return size;
455}
456
457STORE(bch_cached_dev)
458{
459 struct cached_dev *dc = container_of(kobj, struct cached_dev,
460 disk.kobj);
461
462 /* no user space access if system is rebooting */
463 if (bcache_is_reboot)
464 return -EBUSY;
465
466 mutex_lock(&bch_register_lock);
467 size = __cached_dev_store(kobj, attr, buf, size);
468
469 if (attr == &sysfs_writeback_running) {
470 /* dc->writeback_running changed in __cached_dev_store() */
471 if (IS_ERR_OR_NULL(dc->writeback_thread)) {
472 /*
473 * reject setting it to 1 via sysfs if writeback
474 * kthread is not created yet.
475 */
476 if (dc->writeback_running) {
477 dc->writeback_running = false;
478 pr_err("%s: failed to run non-existent writeback thread\n",
479 dc->disk.disk->disk_name);
480 }
481 } else
482 /*
483 * writeback kthread will check if dc->writeback_running
484 * is true or false.
485 */
486 bch_writeback_queue(dc);
487 }
488
489 /*
490 * Only set BCACHE_DEV_WB_RUNNING when cached device attached to
491 * a cache set, otherwise it doesn't make sense.
492 */
493 if (attr == &sysfs_writeback_percent)
494 if ((dc->disk.c != NULL) &&
495 (!test_and_set_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags)))
496 schedule_delayed_work(&dc->writeback_rate_update,
497 dc->writeback_rate_update_seconds * HZ);
498
499 mutex_unlock(&bch_register_lock);
500 return size;
501}
502
503static struct attribute *bch_cached_dev_attrs[] = {
504 &sysfs_attach,
505 &sysfs_detach,
506 &sysfs_stop,
507#if 0
508 &sysfs_data_csum,
509#endif
510 &sysfs_cache_mode,
511 &sysfs_readahead_cache_policy,
512 &sysfs_stop_when_cache_set_failed,
513 &sysfs_writeback_metadata,
514 &sysfs_writeback_running,
515 &sysfs_writeback_delay,
516 &sysfs_writeback_percent,
517 &sysfs_writeback_rate,
518 &sysfs_writeback_consider_fragment,
519 &sysfs_writeback_rate_update_seconds,
520 &sysfs_writeback_rate_i_term_inverse,
521 &sysfs_writeback_rate_p_term_inverse,
522 &sysfs_writeback_rate_fp_term_low,
523 &sysfs_writeback_rate_fp_term_mid,
524 &sysfs_writeback_rate_fp_term_high,
525 &sysfs_writeback_rate_minimum,
526 &sysfs_writeback_rate_debug,
527 &sysfs_io_errors,
528 &sysfs_io_error_limit,
529 &sysfs_io_disable,
530 &sysfs_dirty_data,
531 &sysfs_stripe_size,
532 &sysfs_partial_stripes_expensive,
533 &sysfs_sequential_cutoff,
534 &sysfs_clear_stats,
535 &sysfs_running,
536 &sysfs_state,
537 &sysfs_label,
538#ifdef CONFIG_BCACHE_DEBUG
539 &sysfs_verify,
540 &sysfs_bypass_torture_test,
541#endif
542 &sysfs_backing_dev_name,
543 &sysfs_backing_dev_uuid,
544 NULL
545};
546ATTRIBUTE_GROUPS(bch_cached_dev);
547KTYPE(bch_cached_dev);
548
549SHOW(bch_flash_dev)
550{
551 struct bcache_device *d = container_of(kobj, struct bcache_device,
552 kobj);
553 struct uuid_entry *u = &d->c->uuids[d->id];
554
555 sysfs_printf(data_csum, "%i", d->data_csum);
556 sysfs_hprint(size, u->sectors << 9);
557
558 if (attr == &sysfs_label) {
559 memcpy(buf, u->label, SB_LABEL_SIZE);
560 buf[SB_LABEL_SIZE + 1] = '\0';
561 strcat(buf, "\n");
562 return strlen(buf);
563 }
564
565 return 0;
566}
567
568STORE(__bch_flash_dev)
569{
570 struct bcache_device *d = container_of(kobj, struct bcache_device,
571 kobj);
572 struct uuid_entry *u = &d->c->uuids[d->id];
573
574 /* no user space access if system is rebooting */
575 if (bcache_is_reboot)
576 return -EBUSY;
577
578 sysfs_strtoul(data_csum, d->data_csum);
579
580 if (attr == &sysfs_size) {
581 uint64_t v;
582
583 strtoi_h_or_return(buf, v);
584
585 u->sectors = v >> 9;
586 bch_uuid_write(d->c);
587 set_capacity(d->disk, u->sectors);
588 }
589
590 if (attr == &sysfs_label) {
591 memcpy(u->label, buf, SB_LABEL_SIZE);
592 bch_uuid_write(d->c);
593 }
594
595 if (attr == &sysfs_unregister) {
596 set_bit(BCACHE_DEV_DETACHING, &d->flags);
597 bcache_device_stop(d);
598 }
599
600 return size;
601}
602STORE_LOCKED(bch_flash_dev)
603
604static struct attribute *bch_flash_dev_attrs[] = {
605 &sysfs_unregister,
606#if 0
607 &sysfs_data_csum,
608#endif
609 &sysfs_label,
610 &sysfs_size,
611 NULL
612};
613ATTRIBUTE_GROUPS(bch_flash_dev);
614KTYPE(bch_flash_dev);
615
616struct bset_stats_op {
617 struct btree_op op;
618 size_t nodes;
619 struct bset_stats stats;
620};
621
622static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b)
623{
624 struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op);
625
626 op->nodes++;
627 bch_btree_keys_stats(&b->keys, &op->stats);
628
629 return MAP_CONTINUE;
630}
631
632static int bch_bset_print_stats(struct cache_set *c, char *buf)
633{
634 struct bset_stats_op op;
635 int ret;
636
637 memset(&op, 0, sizeof(op));
638 bch_btree_op_init(&op.op, -1);
639
640 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats);
641 if (ret < 0)
642 return ret;
643
644 return snprintf(buf, PAGE_SIZE,
645 "btree nodes: %zu\n"
646 "written sets: %zu\n"
647 "unwritten sets: %zu\n"
648 "written key bytes: %zu\n"
649 "unwritten key bytes: %zu\n"
650 "floats: %zu\n"
651 "failed: %zu\n",
652 op.nodes,
653 op.stats.sets_written, op.stats.sets_unwritten,
654 op.stats.bytes_written, op.stats.bytes_unwritten,
655 op.stats.floats, op.stats.failed);
656}
657
658static unsigned int bch_root_usage(struct cache_set *c)
659{
660 unsigned int bytes = 0;
661 struct bkey *k;
662 struct btree *b;
663 struct btree_iter iter;
664
665 goto lock_root;
666
667 do {
668 rw_unlock(false, b);
669lock_root:
670 b = c->root;
671 rw_lock(false, b, b->level);
672 } while (b != c->root);
673
674 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad)
675 bytes += bkey_bytes(k);
676
677 rw_unlock(false, b);
678
679 return (bytes * 100) / btree_bytes(c);
680}
681
682static size_t bch_cache_size(struct cache_set *c)
683{
684 size_t ret = 0;
685 struct btree *b;
686
687 mutex_lock(&c->bucket_lock);
688 list_for_each_entry(b, &c->btree_cache, list)
689 ret += 1 << (b->keys.page_order + PAGE_SHIFT);
690
691 mutex_unlock(&c->bucket_lock);
692 return ret;
693}
694
695static unsigned int bch_cache_max_chain(struct cache_set *c)
696{
697 unsigned int ret = 0;
698 struct hlist_head *h;
699
700 mutex_lock(&c->bucket_lock);
701
702 for (h = c->bucket_hash;
703 h < c->bucket_hash + (1 << BUCKET_HASH_BITS);
704 h++) {
705 unsigned int i = 0;
706 struct hlist_node *p;
707
708 hlist_for_each(p, h)
709 i++;
710
711 ret = max(ret, i);
712 }
713
714 mutex_unlock(&c->bucket_lock);
715 return ret;
716}
717
718static unsigned int bch_btree_used(struct cache_set *c)
719{
720 return div64_u64(c->gc_stats.key_bytes * 100,
721 (c->gc_stats.nodes ?: 1) * btree_bytes(c));
722}
723
724static unsigned int bch_average_key_size(struct cache_set *c)
725{
726 return c->gc_stats.nkeys
727 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys)
728 : 0;
729}
730
731SHOW(__bch_cache_set)
732{
733 struct cache_set *c = container_of(kobj, struct cache_set, kobj);
734
735 sysfs_print(synchronous, CACHE_SYNC(&c->cache->sb));
736 sysfs_print(journal_delay_ms, c->journal_delay_ms);
737 sysfs_hprint(bucket_size, bucket_bytes(c->cache));
738 sysfs_hprint(block_size, block_bytes(c->cache));
739 sysfs_print(tree_depth, c->root->level);
740 sysfs_print(root_usage_percent, bch_root_usage(c));
741
742 sysfs_hprint(btree_cache_size, bch_cache_size(c));
743 sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c));
744 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use);
745
746 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms);
747 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us);
748 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us);
749 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us);
750
751 sysfs_print(btree_used_percent, bch_btree_used(c));
752 sysfs_print(btree_nodes, c->gc_stats.nodes);
753 sysfs_hprint(average_key_size, bch_average_key_size(c));
754
755 sysfs_print(cache_read_races,
756 atomic_long_read(&c->cache_read_races));
757
758 sysfs_print(reclaim,
759 atomic_long_read(&c->reclaim));
760
761 sysfs_print(reclaimed_journal_buckets,
762 atomic_long_read(&c->reclaimed_journal_buckets));
763
764 sysfs_print(flush_write,
765 atomic_long_read(&c->flush_write));
766
767 sysfs_print(writeback_keys_done,
768 atomic_long_read(&c->writeback_keys_done));
769 sysfs_print(writeback_keys_failed,
770 atomic_long_read(&c->writeback_keys_failed));
771
772 if (attr == &sysfs_errors)
773 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions,
774 c->on_error);
775
776 /* See count_io_errors for why 88 */
777 sysfs_print(io_error_halflife, c->error_decay * 88);
778 sysfs_print(io_error_limit, c->error_limit);
779
780 sysfs_hprint(congested,
781 ((uint64_t) bch_get_congested(c)) << 9);
782 sysfs_print(congested_read_threshold_us,
783 c->congested_read_threshold_us);
784 sysfs_print(congested_write_threshold_us,
785 c->congested_write_threshold_us);
786
787 sysfs_print(cutoff_writeback, bch_cutoff_writeback);
788 sysfs_print(cutoff_writeback_sync, bch_cutoff_writeback_sync);
789
790 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin));
791 sysfs_printf(verify, "%i", c->verify);
792 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled);
793 sysfs_printf(expensive_debug_checks,
794 "%i", c->expensive_debug_checks);
795 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite);
796 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled);
797 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled);
798 sysfs_printf(idle_max_writeback_rate, "%i",
799 c->idle_max_writeback_rate_enabled);
800 sysfs_printf(gc_after_writeback, "%i", c->gc_after_writeback);
801 sysfs_printf(io_disable, "%i",
802 test_bit(CACHE_SET_IO_DISABLE, &c->flags));
803
804 if (attr == &sysfs_bset_tree_stats)
805 return bch_bset_print_stats(c, buf);
806
807 if (attr == &sysfs_feature_compat)
808 return bch_print_cache_set_feature_compat(c, buf, PAGE_SIZE);
809 if (attr == &sysfs_feature_ro_compat)
810 return bch_print_cache_set_feature_ro_compat(c, buf, PAGE_SIZE);
811 if (attr == &sysfs_feature_incompat)
812 return bch_print_cache_set_feature_incompat(c, buf, PAGE_SIZE);
813
814 return 0;
815}
816SHOW_LOCKED(bch_cache_set)
817
818STORE(__bch_cache_set)
819{
820 struct cache_set *c = container_of(kobj, struct cache_set, kobj);
821 ssize_t v;
822
823 /* no user space access if system is rebooting */
824 if (bcache_is_reboot)
825 return -EBUSY;
826
827 if (attr == &sysfs_unregister)
828 bch_cache_set_unregister(c);
829
830 if (attr == &sysfs_stop)
831 bch_cache_set_stop(c);
832
833 if (attr == &sysfs_synchronous) {
834 bool sync = strtoul_or_return(buf);
835
836 if (sync != CACHE_SYNC(&c->cache->sb)) {
837 SET_CACHE_SYNC(&c->cache->sb, sync);
838 bcache_write_super(c);
839 }
840 }
841
842 if (attr == &sysfs_flash_vol_create) {
843 int r;
844 uint64_t v;
845
846 strtoi_h_or_return(buf, v);
847
848 r = bch_flash_dev_create(c, v);
849 if (r)
850 return r;
851 }
852
853 if (attr == &sysfs_clear_stats) {
854 atomic_long_set(&c->writeback_keys_done, 0);
855 atomic_long_set(&c->writeback_keys_failed, 0);
856
857 memset(&c->gc_stats, 0, sizeof(struct gc_stat));
858 bch_cache_accounting_clear(&c->accounting);
859 }
860
861 if (attr == &sysfs_trigger_gc)
862 force_wake_up_gc(c);
863
864 if (attr == &sysfs_prune_cache) {
865 struct shrink_control sc;
866
867 sc.gfp_mask = GFP_KERNEL;
868 sc.nr_to_scan = strtoul_or_return(buf);
869 c->shrink.scan_objects(&c->shrink, &sc);
870 }
871
872 sysfs_strtoul_clamp(congested_read_threshold_us,
873 c->congested_read_threshold_us,
874 0, UINT_MAX);
875 sysfs_strtoul_clamp(congested_write_threshold_us,
876 c->congested_write_threshold_us,
877 0, UINT_MAX);
878
879 if (attr == &sysfs_errors) {
880 v = __sysfs_match_string(error_actions, -1, buf);
881 if (v < 0)
882 return v;
883
884 c->on_error = v;
885 }
886
887 sysfs_strtoul_clamp(io_error_limit, c->error_limit, 0, UINT_MAX);
888
889 /* See count_io_errors() for why 88 */
890 if (attr == &sysfs_io_error_halflife) {
891 unsigned long v = 0;
892 ssize_t ret;
893
894 ret = strtoul_safe_clamp(buf, v, 0, UINT_MAX);
895 if (!ret) {
896 c->error_decay = v / 88;
897 return size;
898 }
899 return ret;
900 }
901
902 if (attr == &sysfs_io_disable) {
903 v = strtoul_or_return(buf);
904 if (v) {
905 if (test_and_set_bit(CACHE_SET_IO_DISABLE,
906 &c->flags))
907 pr_warn("CACHE_SET_IO_DISABLE already set\n");
908 } else {
909 if (!test_and_clear_bit(CACHE_SET_IO_DISABLE,
910 &c->flags))
911 pr_warn("CACHE_SET_IO_DISABLE already cleared\n");
912 }
913 }
914
915 sysfs_strtoul_clamp(journal_delay_ms,
916 c->journal_delay_ms,
917 0, USHRT_MAX);
918 sysfs_strtoul_bool(verify, c->verify);
919 sysfs_strtoul_bool(key_merging_disabled, c->key_merging_disabled);
920 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks);
921 sysfs_strtoul_bool(gc_always_rewrite, c->gc_always_rewrite);
922 sysfs_strtoul_bool(btree_shrinker_disabled, c->shrinker_disabled);
923 sysfs_strtoul_bool(copy_gc_enabled, c->copy_gc_enabled);
924 sysfs_strtoul_bool(idle_max_writeback_rate,
925 c->idle_max_writeback_rate_enabled);
926
927 /*
928 * write gc_after_writeback here may overwrite an already set
929 * BCH_DO_AUTO_GC, it doesn't matter because this flag will be
930 * set in next chance.
931 */
932 sysfs_strtoul_clamp(gc_after_writeback, c->gc_after_writeback, 0, 1);
933
934 return size;
935}
936STORE_LOCKED(bch_cache_set)
937
938SHOW(bch_cache_set_internal)
939{
940 struct cache_set *c = container_of(kobj, struct cache_set, internal);
941
942 return bch_cache_set_show(&c->kobj, attr, buf);
943}
944
945STORE(bch_cache_set_internal)
946{
947 struct cache_set *c = container_of(kobj, struct cache_set, internal);
948
949 /* no user space access if system is rebooting */
950 if (bcache_is_reboot)
951 return -EBUSY;
952
953 return bch_cache_set_store(&c->kobj, attr, buf, size);
954}
955
956static void bch_cache_set_internal_release(struct kobject *k)
957{
958}
959
960static struct attribute *bch_cache_set_attrs[] = {
961 &sysfs_unregister,
962 &sysfs_stop,
963 &sysfs_synchronous,
964 &sysfs_journal_delay_ms,
965 &sysfs_flash_vol_create,
966
967 &sysfs_bucket_size,
968 &sysfs_block_size,
969 &sysfs_tree_depth,
970 &sysfs_root_usage_percent,
971 &sysfs_btree_cache_size,
972 &sysfs_cache_available_percent,
973
974 &sysfs_average_key_size,
975
976 &sysfs_errors,
977 &sysfs_io_error_limit,
978 &sysfs_io_error_halflife,
979 &sysfs_congested,
980 &sysfs_congested_read_threshold_us,
981 &sysfs_congested_write_threshold_us,
982 &sysfs_clear_stats,
983 NULL
984};
985ATTRIBUTE_GROUPS(bch_cache_set);
986KTYPE(bch_cache_set);
987
988static struct attribute *bch_cache_set_internal_attrs[] = {
989 &sysfs_active_journal_entries,
990
991 sysfs_time_stats_attribute_list(btree_gc, sec, ms)
992 sysfs_time_stats_attribute_list(btree_split, sec, us)
993 sysfs_time_stats_attribute_list(btree_sort, ms, us)
994 sysfs_time_stats_attribute_list(btree_read, ms, us)
995
996 &sysfs_btree_nodes,
997 &sysfs_btree_used_percent,
998 &sysfs_btree_cache_max_chain,
999
1000 &sysfs_bset_tree_stats,
1001 &sysfs_cache_read_races,
1002 &sysfs_reclaim,
1003 &sysfs_reclaimed_journal_buckets,
1004 &sysfs_flush_write,
1005 &sysfs_writeback_keys_done,
1006 &sysfs_writeback_keys_failed,
1007
1008 &sysfs_trigger_gc,
1009 &sysfs_prune_cache,
1010#ifdef CONFIG_BCACHE_DEBUG
1011 &sysfs_verify,
1012 &sysfs_key_merging_disabled,
1013 &sysfs_expensive_debug_checks,
1014#endif
1015 &sysfs_gc_always_rewrite,
1016 &sysfs_btree_shrinker_disabled,
1017 &sysfs_copy_gc_enabled,
1018 &sysfs_idle_max_writeback_rate,
1019 &sysfs_gc_after_writeback,
1020 &sysfs_io_disable,
1021 &sysfs_cutoff_writeback,
1022 &sysfs_cutoff_writeback_sync,
1023 &sysfs_feature_compat,
1024 &sysfs_feature_ro_compat,
1025 &sysfs_feature_incompat,
1026 NULL
1027};
1028ATTRIBUTE_GROUPS(bch_cache_set_internal);
1029KTYPE(bch_cache_set_internal);
1030
1031static int __bch_cache_cmp(const void *l, const void *r)
1032{
1033 cond_resched();
1034 return *((uint16_t *)r) - *((uint16_t *)l);
1035}
1036
1037SHOW(__bch_cache)
1038{
1039 struct cache *ca = container_of(kobj, struct cache, kobj);
1040
1041 sysfs_hprint(bucket_size, bucket_bytes(ca));
1042 sysfs_hprint(block_size, block_bytes(ca));
1043 sysfs_print(nbuckets, ca->sb.nbuckets);
1044 sysfs_print(discard, ca->discard);
1045 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9);
1046 sysfs_hprint(btree_written,
1047 atomic_long_read(&ca->btree_sectors_written) << 9);
1048 sysfs_hprint(metadata_written,
1049 (atomic_long_read(&ca->meta_sectors_written) +
1050 atomic_long_read(&ca->btree_sectors_written)) << 9);
1051
1052 sysfs_print(io_errors,
1053 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT);
1054
1055 if (attr == &sysfs_cache_replacement_policy)
1056 return bch_snprint_string_list(buf, PAGE_SIZE,
1057 cache_replacement_policies,
1058 CACHE_REPLACEMENT(&ca->sb));
1059
1060 if (attr == &sysfs_priority_stats) {
1061 struct bucket *b;
1062 size_t n = ca->sb.nbuckets, i;
1063 size_t unused = 0, available = 0, dirty = 0, meta = 0;
1064 uint64_t sum = 0;
1065 /* Compute 31 quantiles */
1066 uint16_t q[31], *p, *cached;
1067 ssize_t ret;
1068
1069 cached = p = vmalloc(array_size(sizeof(uint16_t),
1070 ca->sb.nbuckets));
1071 if (!p)
1072 return -ENOMEM;
1073
1074 mutex_lock(&ca->set->bucket_lock);
1075 for_each_bucket(b, ca) {
1076 if (!GC_SECTORS_USED(b))
1077 unused++;
1078 if (GC_MARK(b) == GC_MARK_RECLAIMABLE)
1079 available++;
1080 if (GC_MARK(b) == GC_MARK_DIRTY)
1081 dirty++;
1082 if (GC_MARK(b) == GC_MARK_METADATA)
1083 meta++;
1084 }
1085
1086 for (i = ca->sb.first_bucket; i < n; i++)
1087 p[i] = ca->buckets[i].prio;
1088 mutex_unlock(&ca->set->bucket_lock);
1089
1090 sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL);
1091
1092 while (n &&
1093 !cached[n - 1])
1094 --n;
1095
1096 while (cached < p + n &&
1097 *cached == BTREE_PRIO) {
1098 cached++;
1099 n--;
1100 }
1101
1102 for (i = 0; i < n; i++)
1103 sum += INITIAL_PRIO - cached[i];
1104
1105 if (n)
1106 do_div(sum, n);
1107
1108 for (i = 0; i < ARRAY_SIZE(q); i++)
1109 q[i] = INITIAL_PRIO - cached[n * (i + 1) /
1110 (ARRAY_SIZE(q) + 1)];
1111
1112 vfree(p);
1113
1114 ret = scnprintf(buf, PAGE_SIZE,
1115 "Unused: %zu%%\n"
1116 "Clean: %zu%%\n"
1117 "Dirty: %zu%%\n"
1118 "Metadata: %zu%%\n"
1119 "Average: %llu\n"
1120 "Sectors per Q: %zu\n"
1121 "Quantiles: [",
1122 unused * 100 / (size_t) ca->sb.nbuckets,
1123 available * 100 / (size_t) ca->sb.nbuckets,
1124 dirty * 100 / (size_t) ca->sb.nbuckets,
1125 meta * 100 / (size_t) ca->sb.nbuckets, sum,
1126 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
1127
1128 for (i = 0; i < ARRAY_SIZE(q); i++)
1129 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
1130 "%u ", q[i]);
1131 ret--;
1132
1133 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n");
1134
1135 return ret;
1136 }
1137
1138 return 0;
1139}
1140SHOW_LOCKED(bch_cache)
1141
1142STORE(__bch_cache)
1143{
1144 struct cache *ca = container_of(kobj, struct cache, kobj);
1145 ssize_t v;
1146
1147 /* no user space access if system is rebooting */
1148 if (bcache_is_reboot)
1149 return -EBUSY;
1150
1151 if (attr == &sysfs_discard) {
1152 bool v = strtoul_or_return(buf);
1153
1154 if (bdev_max_discard_sectors(ca->bdev))
1155 ca->discard = v;
1156
1157 if (v != CACHE_DISCARD(&ca->sb)) {
1158 SET_CACHE_DISCARD(&ca->sb, v);
1159 bcache_write_super(ca->set);
1160 }
1161 }
1162
1163 if (attr == &sysfs_cache_replacement_policy) {
1164 v = __sysfs_match_string(cache_replacement_policies, -1, buf);
1165 if (v < 0)
1166 return v;
1167
1168 if ((unsigned int) v != CACHE_REPLACEMENT(&ca->sb)) {
1169 mutex_lock(&ca->set->bucket_lock);
1170 SET_CACHE_REPLACEMENT(&ca->sb, v);
1171 mutex_unlock(&ca->set->bucket_lock);
1172
1173 bcache_write_super(ca->set);
1174 }
1175 }
1176
1177 if (attr == &sysfs_clear_stats) {
1178 atomic_long_set(&ca->sectors_written, 0);
1179 atomic_long_set(&ca->btree_sectors_written, 0);
1180 atomic_long_set(&ca->meta_sectors_written, 0);
1181 atomic_set(&ca->io_count, 0);
1182 atomic_set(&ca->io_errors, 0);
1183 }
1184
1185 return size;
1186}
1187STORE_LOCKED(bch_cache)
1188
1189static struct attribute *bch_cache_attrs[] = {
1190 &sysfs_bucket_size,
1191 &sysfs_block_size,
1192 &sysfs_nbuckets,
1193 &sysfs_priority_stats,
1194 &sysfs_discard,
1195 &sysfs_written,
1196 &sysfs_btree_written,
1197 &sysfs_metadata_written,
1198 &sysfs_io_errors,
1199 &sysfs_clear_stats,
1200 &sysfs_cache_replacement_policy,
1201 NULL
1202};
1203ATTRIBUTE_GROUPS(bch_cache);
1204KTYPE(bch_cache);
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
19extern bool bcache_is_reboot;
20
21/* Default is 0 ("writethrough") */
22static const char * const bch_cache_modes[] = {
23 "writethrough",
24 "writeback",
25 "writearound",
26 "none",
27 NULL
28};
29
30/* Default is 0 ("auto") */
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 * Except for dirty and target, other values should
204 * be 0 if writeback is not running.
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 /* convert binary uuid into 36-byte string plus '\0' */
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 /* no user space access if system is rebooting */
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 /* no user space access if system is rebooting */
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 /* dc->writeback_running changed in __cached_dev_store() */
429 if (IS_ERR_OR_NULL(dc->writeback_thread)) {
430 /*
431 * reject setting it to 1 via sysfs if writeback
432 * kthread is not created yet.
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 * writeback kthread will check if dc->writeback_running
442 * is true or false.
443 */
444 bch_writeback_queue(dc);
445 }
446
447 /*
448 * Only set BCACHE_DEV_WB_RUNNING when cached device attached to
449 * a cache set, otherwise it doesn't make sense.
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 /* no user space access if system is rebooting */
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 /* See count_io_errors for why 88 */
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 /* no user space access if system is rebooting */
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 /* See count_io_errors() for why 88 */
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 * write gc_after_writeback here may overwrite an already set
869 * BCH_DO_AUTO_GC, it doesn't matter because this flag will be
870 * set in next chance.
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 /* no user space access if system is rebooting */
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 cond_resched();
968 return *((uint16_t *)r) - *((uint16_t *)l);
969}
970
971SHOW(__bch_cache)
972{
973 struct cache *ca = container_of(kobj, struct cache, kobj);
974
975 sysfs_hprint(bucket_size, bucket_bytes(ca));
976 sysfs_hprint(block_size, block_bytes(ca));
977 sysfs_print(nbuckets, ca->sb.nbuckets);
978 sysfs_print(discard, ca->discard);
979 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9);
980 sysfs_hprint(btree_written,
981 atomic_long_read(&ca->btree_sectors_written) << 9);
982 sysfs_hprint(metadata_written,
983 (atomic_long_read(&ca->meta_sectors_written) +
984 atomic_long_read(&ca->btree_sectors_written)) << 9);
985
986 sysfs_print(io_errors,
987 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT);
988
989 if (attr == &sysfs_cache_replacement_policy)
990 return bch_snprint_string_list(buf, PAGE_SIZE,
991 cache_replacement_policies,
992 CACHE_REPLACEMENT(&ca->sb));
993
994 if (attr == &sysfs_priority_stats) {
995 struct bucket *b;
996 size_t n = ca->sb.nbuckets, i;
997 size_t unused = 0, available = 0, dirty = 0, meta = 0;
998 uint64_t sum = 0;
999 /* Compute 31 quantiles */
1000 uint16_t q[31], *p, *cached;
1001 ssize_t ret;
1002
1003 cached = p = vmalloc(array_size(sizeof(uint16_t),
1004 ca->sb.nbuckets));
1005 if (!p)
1006 return -ENOMEM;
1007
1008 mutex_lock(&ca->set->bucket_lock);
1009 for_each_bucket(b, ca) {
1010 if (!GC_SECTORS_USED(b))
1011 unused++;
1012 if (GC_MARK(b) == GC_MARK_RECLAIMABLE)
1013 available++;
1014 if (GC_MARK(b) == GC_MARK_DIRTY)
1015 dirty++;
1016 if (GC_MARK(b) == GC_MARK_METADATA)
1017 meta++;
1018 }
1019
1020 for (i = ca->sb.first_bucket; i < n; i++)
1021 p[i] = ca->buckets[i].prio;
1022 mutex_unlock(&ca->set->bucket_lock);
1023
1024 sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL);
1025
1026 while (n &&
1027 !cached[n - 1])
1028 --n;
1029
1030 while (cached < p + n &&
1031 *cached == BTREE_PRIO)
1032 cached++, n--;
1033
1034 for (i = 0; i < n; i++)
1035 sum += INITIAL_PRIO - cached[i];
1036
1037 if (n)
1038 do_div(sum, n);
1039
1040 for (i = 0; i < ARRAY_SIZE(q); i++)
1041 q[i] = INITIAL_PRIO - cached[n * (i + 1) /
1042 (ARRAY_SIZE(q) + 1)];
1043
1044 vfree(p);
1045
1046 ret = scnprintf(buf, PAGE_SIZE,
1047 "Unused: %zu%%\n"
1048 "Clean: %zu%%\n"
1049 "Dirty: %zu%%\n"
1050 "Metadata: %zu%%\n"
1051 "Average: %llu\n"
1052 "Sectors per Q: %zu\n"
1053 "Quantiles: [",
1054 unused * 100 / (size_t) ca->sb.nbuckets,
1055 available * 100 / (size_t) ca->sb.nbuckets,
1056 dirty * 100 / (size_t) ca->sb.nbuckets,
1057 meta * 100 / (size_t) ca->sb.nbuckets, sum,
1058 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
1059
1060 for (i = 0; i < ARRAY_SIZE(q); i++)
1061 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
1062 "%u ", q[i]);
1063 ret--;
1064
1065 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n");
1066
1067 return ret;
1068 }
1069
1070 return 0;
1071}
1072SHOW_LOCKED(bch_cache)
1073
1074STORE(__bch_cache)
1075{
1076 struct cache *ca = container_of(kobj, struct cache, kobj);
1077 ssize_t v;
1078
1079 /* no user space access if system is rebooting */
1080 if (bcache_is_reboot)
1081 return -EBUSY;
1082
1083 if (attr == &sysfs_discard) {
1084 bool v = strtoul_or_return(buf);
1085
1086 if (blk_queue_discard(bdev_get_queue(ca->bdev)))
1087 ca->discard = v;
1088
1089 if (v != CACHE_DISCARD(&ca->sb)) {
1090 SET_CACHE_DISCARD(&ca->sb, v);
1091 bcache_write_super(ca->set);
1092 }
1093 }
1094
1095 if (attr == &sysfs_cache_replacement_policy) {
1096 v = __sysfs_match_string(cache_replacement_policies, -1, buf);
1097 if (v < 0)
1098 return v;
1099
1100 if ((unsigned int) v != CACHE_REPLACEMENT(&ca->sb)) {
1101 mutex_lock(&ca->set->bucket_lock);
1102 SET_CACHE_REPLACEMENT(&ca->sb, v);
1103 mutex_unlock(&ca->set->bucket_lock);
1104
1105 bcache_write_super(ca->set);
1106 }
1107 }
1108
1109 if (attr == &sysfs_clear_stats) {
1110 atomic_long_set(&ca->sectors_written, 0);
1111 atomic_long_set(&ca->btree_sectors_written, 0);
1112 atomic_long_set(&ca->meta_sectors_written, 0);
1113 atomic_set(&ca->io_count, 0);
1114 atomic_set(&ca->io_errors, 0);
1115 }
1116
1117 return size;
1118}
1119STORE_LOCKED(bch_cache)
1120
1121static struct attribute *bch_cache_files[] = {
1122 &sysfs_bucket_size,
1123 &sysfs_block_size,
1124 &sysfs_nbuckets,
1125 &sysfs_priority_stats,
1126 &sysfs_discard,
1127 &sysfs_written,
1128 &sysfs_btree_written,
1129 &sysfs_metadata_written,
1130 &sysfs_io_errors,
1131 &sysfs_clear_stats,
1132 &sysfs_cache_replacement_policy,
1133 NULL
1134};
1135KTYPE(bch_cache);