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Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes
[deliverable/linux.git] / drivers / md / bcache / sysfs.c
CommitLineData
cafe5635
KO		 1/*
2 * bcache sysfs interfaces
3 *
4 * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
5 * Copyright 2012 Google, Inc.
6 */
7
8#include "bcache.h"
9#include "sysfs.h"
10#include "btree.h"
11#include "request.h"
279afbad 12#include "writeback.h"
cafe5635 13
c37511b8 14#include <linux/blkdev.h>
cafe5635
KO		 15#include <linux/sort.h>
16
17static const char * const cache_replacement_policies[] = {
18 "lru",
19 "fifo",
20 "random",
21 NULL
22};
23
24write_attribute(attach);
25write_attribute(detach);
26write_attribute(unregister);
27write_attribute(stop);
28write_attribute(clear_stats);
29write_attribute(trigger_gc);
30write_attribute(prune_cache);
31write_attribute(flash_vol_create);
32
33read_attribute(bucket_size);
34read_attribute(block_size);
35read_attribute(nbuckets);
36read_attribute(tree_depth);
37read_attribute(root_usage_percent);
38read_attribute(priority_stats);
39read_attribute(btree_cache_size);
40read_attribute(btree_cache_max_chain);
41read_attribute(cache_available_percent);
42read_attribute(written);
43read_attribute(btree_written);
44read_attribute(metadata_written);
45read_attribute(active_journal_entries);
46
47sysfs_time_stats_attribute(btree_gc, sec, ms);
48sysfs_time_stats_attribute(btree_split, sec, us);
49sysfs_time_stats_attribute(btree_sort, ms, us);
50sysfs_time_stats_attribute(btree_read, ms, us);
51sysfs_time_stats_attribute(try_harder, ms, us);
52
53read_attribute(btree_nodes);
54read_attribute(btree_used_percent);
55read_attribute(average_key_size);
56read_attribute(dirty_data);
57read_attribute(bset_tree_stats);
58
59read_attribute(state);
60read_attribute(cache_read_races);
61read_attribute(writeback_keys_done);
62read_attribute(writeback_keys_failed);
63read_attribute(io_errors);
64read_attribute(congested);
65rw_attribute(congested_read_threshold_us);
66rw_attribute(congested_write_threshold_us);
67
68rw_attribute(sequential_cutoff);
69rw_attribute(sequential_merge);
70rw_attribute(data_csum);
71rw_attribute(cache_mode);
72rw_attribute(writeback_metadata);
73rw_attribute(writeback_running);
74rw_attribute(writeback_percent);
75rw_attribute(writeback_delay);
76rw_attribute(writeback_rate);
77
78rw_attribute(writeback_rate_update_seconds);
79rw_attribute(writeback_rate_d_term);
80rw_attribute(writeback_rate_p_term_inverse);
81rw_attribute(writeback_rate_d_smooth);
82read_attribute(writeback_rate_debug);
83
72c27061
KO		 84read_attribute(stripe_size);
85read_attribute(partial_stripes_expensive);
86
cafe5635
KO		 87rw_attribute(synchronous);
88rw_attribute(journal_delay_ms);
89rw_attribute(discard);
90rw_attribute(running);
91rw_attribute(label);
92rw_attribute(readahead);
93rw_attribute(io_error_limit);
94rw_attribute(io_error_halflife);
95rw_attribute(verify);
96rw_attribute(key_merging_disabled);
97rw_attribute(gc_always_rewrite);
98rw_attribute(freelist_percent);
99rw_attribute(cache_replacement_policy);
100rw_attribute(btree_shrinker_disabled);
101rw_attribute(copy_gc_enabled);
102rw_attribute(size);
103
104SHOW(__bch_cached_dev)
105{
106 struct cached_dev *dc = container_of(kobj, struct cached_dev,
107 disk.kobj);
108 const char *states[] = { "no cache", "clean", "dirty", "inconsistent" };
109
110#define var(stat) (dc->stat)
111
112 if (attr == &sysfs_cache_mode)
169ef1cf
KO		 113 return bch_snprint_string_list(buf, PAGE_SIZE,
114 bch_cache_modes + 1,
115 BDEV_CACHE_MODE(&dc->sb));
cafe5635
KO		 116
117 sysfs_printf(data_csum, "%i", dc->disk.data_csum);
118 var_printf(verify, "%i");
119 var_printf(writeback_metadata, "%i");
120 var_printf(writeback_running, "%i");
121 var_print(writeback_delay);
122 var_print(writeback_percent);
123 sysfs_print(writeback_rate, dc->writeback_rate.rate);
124
125 var_print(writeback_rate_update_seconds);
126 var_print(writeback_rate_d_term);
127 var_print(writeback_rate_p_term_inverse);
128 var_print(writeback_rate_d_smooth);
129
130 if (attr == &sysfs_writeback_rate_debug) {
131 char dirty[20];
132 char derivative[20];
133 char target[20];
169ef1cf 134 bch_hprint(dirty,
279afbad 135 bcache_dev_sectors_dirty(&dc->disk) << 9);
169ef1cf
KO		 136 bch_hprint(derivative, dc->writeback_rate_derivative << 9);
137 bch_hprint(target, dc->writeback_rate_target << 9);
cafe5635
KO		 138
139 return sprintf(buf,
140 "rate:\t\t%u\n"
141 "change:\t\t%i\n"
142 "dirty:\t\t%s\n"
143 "derivative:\t%s\n"
144 "target:\t\t%s\n",
145 dc->writeback_rate.rate,
146 dc->writeback_rate_change,
147 dirty, derivative, target);
148 }
149
150 sysfs_hprint(dirty_data,
279afbad 151 bcache_dev_sectors_dirty(&dc->disk) << 9);
cafe5635 152
72c27061
KO		 153 sysfs_hprint(stripe_size, (1 << dc->disk.stripe_size_bits) << 9);
154 var_printf(partial_stripes_expensive, "%u");
155
cafe5635
KO		 156 var_printf(sequential_merge, "%i");
157 var_hprint(sequential_cutoff);
158 var_hprint(readahead);
159
160 sysfs_print(running, atomic_read(&dc->running));
161 sysfs_print(state, states[BDEV_STATE(&dc->sb)]);
162
163 if (attr == &sysfs_label) {
164 memcpy(buf, dc->sb.label, SB_LABEL_SIZE);
165 buf[SB_LABEL_SIZE + 1] = '\0';
166 strcat(buf, "\n");
167 return strlen(buf);
168 }
169
170#undef var
171 return 0;
172}
173SHOW_LOCKED(bch_cached_dev)
174
175STORE(__cached_dev)
176{
177 struct cached_dev *dc = container_of(kobj, struct cached_dev,
178 disk.kobj);
179 unsigned v = size;
180 struct cache_set *c;
ab9e1400 181 struct kobj_uevent_env *env;
cafe5635
KO		 182
183#define d_strtoul(var) sysfs_strtoul(var, dc->var)
184#define d_strtoi_h(var) sysfs_hatoi(var, dc->var)
185
186 sysfs_strtoul(data_csum, dc->disk.data_csum);
187 d_strtoul(verify);
188 d_strtoul(writeback_metadata);
189 d_strtoul(writeback_running);
190 d_strtoul(writeback_delay);
191 sysfs_strtoul_clamp(writeback_rate,
192 dc->writeback_rate.rate, 1, 1000000);
193 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40);
194
195 d_strtoul(writeback_rate_update_seconds);
196 d_strtoul(writeback_rate_d_term);
197 d_strtoul(writeback_rate_p_term_inverse);
198 sysfs_strtoul_clamp(writeback_rate_p_term_inverse,
199 dc->writeback_rate_p_term_inverse, 1, INT_MAX);
200 d_strtoul(writeback_rate_d_smooth);
201
202 d_strtoul(sequential_merge);
203 d_strtoi_h(sequential_cutoff);
204 d_strtoi_h(readahead);
205
206 if (attr == &sysfs_clear_stats)
207 bch_cache_accounting_clear(&dc->accounting);
208
209 if (attr == &sysfs_running &&
210 strtoul_or_return(buf))
211 bch_cached_dev_run(dc);
212
213 if (attr == &sysfs_cache_mode) {
169ef1cf 214 ssize_t v = bch_read_string_list(buf, bch_cache_modes + 1);
cafe5635
KO		 215
216 if (v < 0)
217 return v;
218
219 if ((unsigned) v != BDEV_CACHE_MODE(&dc->sb)) {
220 SET_BDEV_CACHE_MODE(&dc->sb, v);
221 bch_write_bdev_super(dc, NULL);
222 }
223 }
224
225 if (attr == &sysfs_label) {
ab9e1400 226 /* note: endlines are preserved */
cafe5635
KO		 227 memcpy(dc->sb.label, buf, SB_LABEL_SIZE);
228 bch_write_bdev_super(dc, NULL);
229 if (dc->disk.c) {
230 memcpy(dc->disk.c->uuids[dc->disk.id].label,
231 buf, SB_LABEL_SIZE);
232 bch_uuid_write(dc->disk.c);
233 }
ab9e1400 234 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
d2a65ce2
DC		 235 if (!env)
236 return -ENOMEM;
ab9e1400
GP		 237 add_uevent_var(env, "DRIVER=bcache");
238 add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid),
239 add_uevent_var(env, "CACHED_LABEL=%s", buf);
240 kobject_uevent_env(
241 &disk_to_dev(dc->disk.disk)->kobj, KOBJ_CHANGE, env->envp);
242 kfree(env);
cafe5635
KO		 243 }
244
245 if (attr == &sysfs_attach) {
169ef1cf 246 if (bch_parse_uuid(buf, dc->sb.set_uuid) < 16)
cafe5635
KO		 247 return -EINVAL;
248
249 list_for_each_entry(c, &bch_cache_sets, list) {
250 v = bch_cached_dev_attach(dc, c);
251 if (!v)
252 return size;
253 }
254
255 pr_err("Can't attach %s: cache set not found", buf);
256 size = v;
257 }
258
259 if (attr == &sysfs_detach && dc->disk.c)
260 bch_cached_dev_detach(dc);
261
262 if (attr == &sysfs_stop)
263 bcache_device_stop(&dc->disk);
264
265 return size;
266}
267
268STORE(bch_cached_dev)
269{
270 struct cached_dev *dc = container_of(kobj, struct cached_dev,
271 disk.kobj);
272
273 mutex_lock(&bch_register_lock);
274 size = __cached_dev_store(kobj, attr, buf, size);
275
276 if (attr == &sysfs_writeback_running)
277 bch_writeback_queue(dc);
278
279 if (attr == &sysfs_writeback_percent)
280 schedule_delayed_work(&dc->writeback_rate_update,
281 dc->writeback_rate_update_seconds * HZ);
282
283 mutex_unlock(&bch_register_lock);
284 return size;
285}
286
287static struct attribute *bch_cached_dev_files[] = {
288 &sysfs_attach,
289 &sysfs_detach,
290 &sysfs_stop,
291#if 0
292 &sysfs_data_csum,
293#endif
294 &sysfs_cache_mode,
295 &sysfs_writeback_metadata,
296 &sysfs_writeback_running,
297 &sysfs_writeback_delay,
298 &sysfs_writeback_percent,
299 &sysfs_writeback_rate,
300 &sysfs_writeback_rate_update_seconds,
301 &sysfs_writeback_rate_d_term,
302 &sysfs_writeback_rate_p_term_inverse,
303 &sysfs_writeback_rate_d_smooth,
304 &sysfs_writeback_rate_debug,
305 &sysfs_dirty_data,
72c27061
KO		 306 &sysfs_stripe_size,
307 &sysfs_partial_stripes_expensive,
cafe5635
KO		 308 &sysfs_sequential_cutoff,
309 &sysfs_sequential_merge,
310 &sysfs_clear_stats,
311 &sysfs_running,
312 &sysfs_state,
313 &sysfs_label,
314 &sysfs_readahead,
315#ifdef CONFIG_BCACHE_DEBUG
316 &sysfs_verify,
317#endif
318 NULL
319};
320KTYPE(bch_cached_dev);
321
322SHOW(bch_flash_dev)
323{
324 struct bcache_device *d = container_of(kobj, struct bcache_device,
325 kobj);
326 struct uuid_entry *u = &d->c->uuids[d->id];
327
328 sysfs_printf(data_csum, "%i", d->data_csum);
329 sysfs_hprint(size, u->sectors << 9);
330
331 if (attr == &sysfs_label) {
332 memcpy(buf, u->label, SB_LABEL_SIZE);
333 buf[SB_LABEL_SIZE + 1] = '\0';
334 strcat(buf, "\n");
335 return strlen(buf);
336 }
337
338 return 0;
339}
340
341STORE(__bch_flash_dev)
342{
343 struct bcache_device *d = container_of(kobj, struct bcache_device,
344 kobj);
345 struct uuid_entry *u = &d->c->uuids[d->id];
346
347 sysfs_strtoul(data_csum, d->data_csum);
348
349 if (attr == &sysfs_size) {
350 uint64_t v;
351 strtoi_h_or_return(buf, v);
352
353 u->sectors = v >> 9;
354 bch_uuid_write(d->c);
355 set_capacity(d->disk, u->sectors);
356 }
357
358 if (attr == &sysfs_label) {
359 memcpy(u->label, buf, SB_LABEL_SIZE);
360 bch_uuid_write(d->c);
361 }
362
363 if (attr == &sysfs_unregister) {
364 atomic_set(&d->detaching, 1);
365 bcache_device_stop(d);
366 }
367
368 return size;
369}
370STORE_LOCKED(bch_flash_dev)
371
372static struct attribute *bch_flash_dev_files[] = {
373 &sysfs_unregister,
374#if 0
375 &sysfs_data_csum,
376#endif
377 &sysfs_label,
378 &sysfs_size,
379 NULL
380};
381KTYPE(bch_flash_dev);
382
383SHOW(__bch_cache_set)
384{
385 unsigned root_usage(struct cache_set *c)
386 {
387 unsigned bytes = 0;
388 struct bkey *k;
389 struct btree *b;
390 struct btree_iter iter;
391
392 goto lock_root;
393
394 do {
395 rw_unlock(false, b);
396lock_root:
397 b = c->root;
398 rw_lock(false, b, b->level);
399 } while (b != c->root);
400
401 for_each_key_filter(b, k, &iter, bch_ptr_bad)
402 bytes += bkey_bytes(k);
403
404 rw_unlock(false, b);
405
406 return (bytes * 100) / btree_bytes(c);
407 }
408
409 size_t cache_size(struct cache_set *c)
410 {
411 size_t ret = 0;
412 struct btree *b;
413
414 mutex_lock(&c->bucket_lock);
415 list_for_each_entry(b, &c->btree_cache, list)
416 ret += 1 << (b->page_order + PAGE_SHIFT);
417
418 mutex_unlock(&c->bucket_lock);
419 return ret;
420 }
421
422 unsigned cache_max_chain(struct cache_set *c)
423 {
424 unsigned ret = 0;
425 struct hlist_head *h;
426
427 mutex_lock(&c->bucket_lock);
428
429 for (h = c->bucket_hash;
430 h < c->bucket_hash + (1 << BUCKET_HASH_BITS);
431 h++) {
432 unsigned i = 0;
433 struct hlist_node *p;
434
435 hlist_for_each(p, h)
436 i++;
437
438 ret = max(ret, i);
439 }
440
441 mutex_unlock(&c->bucket_lock);
442 return ret;
443 }
444
445 unsigned btree_used(struct cache_set *c)
446 {
447 return div64_u64(c->gc_stats.key_bytes * 100,
448 (c->gc_stats.nodes ?: 1) * btree_bytes(c));
449 }
450
451 unsigned average_key_size(struct cache_set *c)
452 {
453 return c->gc_stats.nkeys
454 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys)
455 : 0;
456 }
457
458 struct cache_set *c = container_of(kobj, struct cache_set, kobj);
459
460 sysfs_print(synchronous, CACHE_SYNC(&c->sb));
461 sysfs_print(journal_delay_ms, c->journal_delay_ms);
462 sysfs_hprint(bucket_size, bucket_bytes(c));
463 sysfs_hprint(block_size, block_bytes(c));
464 sysfs_print(tree_depth, c->root->level);
465 sysfs_print(root_usage_percent, root_usage(c));
466
467 sysfs_hprint(btree_cache_size, cache_size(c));
468 sysfs_print(btree_cache_max_chain, cache_max_chain(c));
469 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use);
470
471 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms);
472 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us);
473 sysfs_print_time_stats(&c->sort_time, btree_sort, ms, us);
474 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us);
475 sysfs_print_time_stats(&c->try_harder_time, try_harder, ms, us);
476
477 sysfs_print(btree_used_percent, btree_used(c));
478 sysfs_print(btree_nodes, c->gc_stats.nodes);
479 sysfs_hprint(dirty_data, c->gc_stats.dirty);
480 sysfs_hprint(average_key_size, average_key_size(c));
481
482 sysfs_print(cache_read_races,
483 atomic_long_read(&c->cache_read_races));
484
485 sysfs_print(writeback_keys_done,
486 atomic_long_read(&c->writeback_keys_done));
487 sysfs_print(writeback_keys_failed,
488 atomic_long_read(&c->writeback_keys_failed));
489
490 /* See count_io_errors for why 88 */
491 sysfs_print(io_error_halflife, c->error_decay * 88);
492 sysfs_print(io_error_limit, c->error_limit >> IO_ERROR_SHIFT);
493
494 sysfs_hprint(congested,
495 ((uint64_t) bch_get_congested(c)) << 9);
496 sysfs_print(congested_read_threshold_us,
497 c->congested_read_threshold_us);
498 sysfs_print(congested_write_threshold_us,
499 c->congested_write_threshold_us);
500
501 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin));
502 sysfs_printf(verify, "%i", c->verify);
503 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled);
504 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite);
505 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled);
506 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled);
507
508 if (attr == &sysfs_bset_tree_stats)
509 return bch_bset_print_stats(c, buf);
510
511 return 0;
512}
513SHOW_LOCKED(bch_cache_set)
514
515STORE(__bch_cache_set)
516{
517 struct cache_set *c = container_of(kobj, struct cache_set, kobj);
518
519 if (attr == &sysfs_unregister)
520 bch_cache_set_unregister(c);
521
522 if (attr == &sysfs_stop)
523 bch_cache_set_stop(c);
524
525 if (attr == &sysfs_synchronous) {
526 bool sync = strtoul_or_return(buf);
527
528 if (sync != CACHE_SYNC(&c->sb)) {
529 SET_CACHE_SYNC(&c->sb, sync);
530 bcache_write_super(c);
531 }
532 }
533
534 if (attr == &sysfs_flash_vol_create) {
535 int r;
536 uint64_t v;
537 strtoi_h_or_return(buf, v);
538
539 r = bch_flash_dev_create(c, v);
540 if (r)
541 return r;
542 }
543
544 if (attr == &sysfs_clear_stats) {
545 atomic_long_set(&c->writeback_keys_done, 0);
546 atomic_long_set(&c->writeback_keys_failed, 0);
547
548 memset(&c->gc_stats, 0, sizeof(struct gc_stat));
549 bch_cache_accounting_clear(&c->accounting);
550 }
551
552 if (attr == &sysfs_trigger_gc)
553 bch_queue_gc(c);
554
555 if (attr == &sysfs_prune_cache) {
556 struct shrink_control sc;
557 sc.gfp_mask = GFP_KERNEL;
558 sc.nr_to_scan = strtoul_or_return(buf);
559 c->shrink.shrink(&c->shrink, &sc);
560 }
561
562 sysfs_strtoul(congested_read_threshold_us,
563 c->congested_read_threshold_us);
564 sysfs_strtoul(congested_write_threshold_us,
565 c->congested_write_threshold_us);
566
567 if (attr == &sysfs_io_error_limit)
568 c->error_limit = strtoul_or_return(buf) << IO_ERROR_SHIFT;
569
570 /* See count_io_errors() for why 88 */
571 if (attr == &sysfs_io_error_halflife)
572 c->error_decay = strtoul_or_return(buf) / 88;
573
574 sysfs_strtoul(journal_delay_ms, c->journal_delay_ms);
575 sysfs_strtoul(verify, c->verify);
576 sysfs_strtoul(key_merging_disabled, c->key_merging_disabled);
577 sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite);
578 sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled);
579 sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled);
580
581 return size;
582}
583STORE_LOCKED(bch_cache_set)
584
585SHOW(bch_cache_set_internal)
586{
587 struct cache_set *c = container_of(kobj, struct cache_set, internal);
588 return bch_cache_set_show(&c->kobj, attr, buf);
589}
590
591STORE(bch_cache_set_internal)
592{
593 struct cache_set *c = container_of(kobj, struct cache_set, internal);
594 return bch_cache_set_store(&c->kobj, attr, buf, size);
595}
596
597static void bch_cache_set_internal_release(struct kobject *k)
598{
599}
600
601static struct attribute *bch_cache_set_files[] = {
602 &sysfs_unregister,
603 &sysfs_stop,
604 &sysfs_synchronous,
605 &sysfs_journal_delay_ms,
606 &sysfs_flash_vol_create,
607
608 &sysfs_bucket_size,
609 &sysfs_block_size,
610 &sysfs_tree_depth,
611 &sysfs_root_usage_percent,
612 &sysfs_btree_cache_size,
613 &sysfs_cache_available_percent,
614
615 &sysfs_average_key_size,
616 &sysfs_dirty_data,
617
618 &sysfs_io_error_limit,
619 &sysfs_io_error_halflife,
620 &sysfs_congested,
621 &sysfs_congested_read_threshold_us,
622 &sysfs_congested_write_threshold_us,
623 &sysfs_clear_stats,
624 NULL
625};
626KTYPE(bch_cache_set);
627
628static struct attribute *bch_cache_set_internal_files[] = {
629 &sysfs_active_journal_entries,
630
631 sysfs_time_stats_attribute_list(btree_gc, sec, ms)
632 sysfs_time_stats_attribute_list(btree_split, sec, us)
633 sysfs_time_stats_attribute_list(btree_sort, ms, us)
634 sysfs_time_stats_attribute_list(btree_read, ms, us)
635 sysfs_time_stats_attribute_list(try_harder, ms, us)
636
637 &sysfs_btree_nodes,
638 &sysfs_btree_used_percent,
639 &sysfs_btree_cache_max_chain,
640
641 &sysfs_bset_tree_stats,
642 &sysfs_cache_read_races,
643 &sysfs_writeback_keys_done,
644 &sysfs_writeback_keys_failed,
645
646 &sysfs_trigger_gc,
647 &sysfs_prune_cache,
648#ifdef CONFIG_BCACHE_DEBUG
649 &sysfs_verify,
650 &sysfs_key_merging_disabled,
651#endif
652 &sysfs_gc_always_rewrite,
653 &sysfs_btree_shrinker_disabled,
654 &sysfs_copy_gc_enabled,
655 NULL
656};
657KTYPE(bch_cache_set_internal);
658
659SHOW(__bch_cache)
660{
661 struct cache *ca = container_of(kobj, struct cache, kobj);
662
663 sysfs_hprint(bucket_size, bucket_bytes(ca));
664 sysfs_hprint(block_size, block_bytes(ca));
665 sysfs_print(nbuckets, ca->sb.nbuckets);
666 sysfs_print(discard, ca->discard);
667 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9);
668 sysfs_hprint(btree_written,
669 atomic_long_read(&ca->btree_sectors_written) << 9);
670 sysfs_hprint(metadata_written,
671 (atomic_long_read(&ca->meta_sectors_written) +
672 atomic_long_read(&ca->btree_sectors_written)) << 9);
673
674 sysfs_print(io_errors,
675 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT);
676
677 sysfs_print(freelist_percent, ca->free.size * 100 /
678 ((size_t) ca->sb.nbuckets));
679
680 if (attr == &sysfs_cache_replacement_policy)
169ef1cf
KO		 681 return bch_snprint_string_list(buf, PAGE_SIZE,
682 cache_replacement_policies,
683 CACHE_REPLACEMENT(&ca->sb));
cafe5635
KO		 684
685 if (attr == &sysfs_priority_stats) {
686 int cmp(const void *l, const void *r)
687 { return *((uint16_t *) r) - *((uint16_t *) l); }
688
cafe5635
KO		 689 size_t n = ca->sb.nbuckets, i, unused, btree;
690 uint64_t sum = 0;
bbc77aa7
KO		 691 /* Compute 31 quantiles */
692 uint16_t q[31], *p, *cached;
cafe5635
KO		 693 ssize_t ret;
694
695 cached = p = vmalloc(ca->sb.nbuckets * sizeof(uint16_t));
696 if (!p)
697 return -ENOMEM;
698
699 mutex_lock(&ca->set->bucket_lock);
700 for (i = ca->sb.first_bucket; i < n; i++)
701 p[i] = ca->buckets[i].prio;
702 mutex_unlock(&ca->set->bucket_lock);
703
704 sort(p, n, sizeof(uint16_t), cmp, NULL);
705
706 while (n &&
707 !cached[n - 1])
708 --n;
709
710 unused = ca->sb.nbuckets - n;
711
712 while (cached < p + n &&
713 *cached == BTREE_PRIO)
714 cached++;
715
716 btree = cached - p;
717 n -= btree;
718
719 for (i = 0; i < n; i++)
720 sum += INITIAL_PRIO - cached[i];
721
722 if (n)
723 do_div(sum, n);
724
bbc77aa7
KO		 725 for (i = 0; i < ARRAY_SIZE(q); i++)
726 q[i] = INITIAL_PRIO - cached[n * (i + 1) /
727 (ARRAY_SIZE(q) + 1)];
cafe5635
KO		 728
729 vfree(p);
730
bbc77aa7
KO		 731 ret = scnprintf(buf, PAGE_SIZE,
732 "Unused: %zu%%\n"
733 "Metadata: %zu%%\n"
734 "Average: %llu\n"
735 "Sectors per Q: %zu\n"
736 "Quantiles: [",
737 unused * 100 / (size_t) ca->sb.nbuckets,
738 btree * 100 / (size_t) ca->sb.nbuckets, sum,
739 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
740
741 for (i = 0; i < ARRAY_SIZE(q); i++)
742 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
743 "%u ", q[i]);
744 ret--;
745
746 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n");
747
cafe5635
KO		 748 return ret;
749 }
750
751 return 0;
752}
753SHOW_LOCKED(bch_cache)
754
755STORE(__bch_cache)
756{
757 struct cache *ca = container_of(kobj, struct cache, kobj);
758
759 if (attr == &sysfs_discard) {
760 bool v = strtoul_or_return(buf);
761
762 if (blk_queue_discard(bdev_get_queue(ca->bdev)))
763 ca->discard = v;
764
765 if (v != CACHE_DISCARD(&ca->sb)) {
766 SET_CACHE_DISCARD(&ca->sb, v);
767 bcache_write_super(ca->set);
768 }
769 }
770
771 if (attr == &sysfs_cache_replacement_policy) {
169ef1cf 772 ssize_t v = bch_read_string_list(buf, cache_replacement_policies);
cafe5635
KO		 773
774 if (v < 0)
775 return v;
776
777 if ((unsigned) v != CACHE_REPLACEMENT(&ca->sb)) {
778 mutex_lock(&ca->set->bucket_lock);
779 SET_CACHE_REPLACEMENT(&ca->sb, v);
780 mutex_unlock(&ca->set->bucket_lock);
781
782 bcache_write_super(ca->set);
783 }
784 }
785
786 if (attr == &sysfs_freelist_percent) {
787 DECLARE_FIFO(long, free);
788 long i;
789 size_t p = strtoul_or_return(buf);
790
791 p = clamp_t(size_t,
792 ((size_t) ca->sb.nbuckets * p) / 100,
793 roundup_pow_of_two(ca->sb.nbuckets) >> 9,
794 ca->sb.nbuckets / 2);
795
796 if (!init_fifo_exact(&free, p, GFP_KERNEL))
797 return -ENOMEM;
798
799 mutex_lock(&ca->set->bucket_lock);
800
801 fifo_move(&free, &ca->free);
802 fifo_swap(&free, &ca->free);
803
804 mutex_unlock(&ca->set->bucket_lock);
805
806 while (fifo_pop(&free, i))
807 atomic_dec(&ca->buckets[i].pin);
808
809 free_fifo(&free);
810 }
811
812 if (attr == &sysfs_clear_stats) {
813 atomic_long_set(&ca->sectors_written, 0);
814 atomic_long_set(&ca->btree_sectors_written, 0);
815 atomic_long_set(&ca->meta_sectors_written, 0);
816 atomic_set(&ca->io_count, 0);
817 atomic_set(&ca->io_errors, 0);
818 }
819
820 return size;
821}
822STORE_LOCKED(bch_cache)
823
824static struct attribute *bch_cache_files[] = {
825 &sysfs_bucket_size,
826 &sysfs_block_size,
827 &sysfs_nbuckets,
828 &sysfs_priority_stats,
829 &sysfs_discard,
830 &sysfs_written,
831 &sysfs_btree_written,
832 &sysfs_metadata_written,
833 &sysfs_io_errors,
834 &sysfs_clear_stats,
835 &sysfs_freelist_percent,
836 &sysfs_cache_replacement_policy,
837 NULL
838};
839KTYPE(bch_cache);
Linux kernel - Deliverables
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