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