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dm: only initialize the request_queue once
[deliverable/linux.git] / drivers / md / bcache / sysfs.c
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"
12 #include "writeback.h"
13
14 #include <linux/blkdev.h>
15 #include <linux/sort.h>
16
17 static const char * const cache_replacement_policies[] = {
18 "lru",
19 "fifo",
20 "random",
21 NULL
22 };
23
24 static const char * const error_actions[] = {
25 "unregister",
26 "panic",
27 NULL
28 };
29
30 write_attribute(attach);
31 write_attribute(detach);
32 write_attribute(unregister);
33 write_attribute(stop);
34 write_attribute(clear_stats);
35 write_attribute(trigger_gc);
36 write_attribute(prune_cache);
37 write_attribute(flash_vol_create);
38
39 read_attribute(bucket_size);
40 read_attribute(block_size);
41 read_attribute(nbuckets);
42 read_attribute(tree_depth);
43 read_attribute(root_usage_percent);
44 read_attribute(priority_stats);
45 read_attribute(btree_cache_size);
46 read_attribute(btree_cache_max_chain);
47 read_attribute(cache_available_percent);
48 read_attribute(written);
49 read_attribute(btree_written);
50 read_attribute(metadata_written);
51 read_attribute(active_journal_entries);
52
53 sysfs_time_stats_attribute(btree_gc, sec, ms);
54 sysfs_time_stats_attribute(btree_split, sec, us);
55 sysfs_time_stats_attribute(btree_sort, ms, us);
56 sysfs_time_stats_attribute(btree_read, ms, us);
57
58 read_attribute(btree_nodes);
59 read_attribute(btree_used_percent);
60 read_attribute(average_key_size);
61 read_attribute(dirty_data);
62 read_attribute(bset_tree_stats);
63
64 read_attribute(state);
65 read_attribute(cache_read_races);
66 read_attribute(writeback_keys_done);
67 read_attribute(writeback_keys_failed);
68 read_attribute(io_errors);
69 read_attribute(congested);
70 rw_attribute(congested_read_threshold_us);
71 rw_attribute(congested_write_threshold_us);
72
73 rw_attribute(sequential_cutoff);
74 rw_attribute(data_csum);
75 rw_attribute(cache_mode);
76 rw_attribute(writeback_metadata);
77 rw_attribute(writeback_running);
78 rw_attribute(writeback_percent);
79 rw_attribute(writeback_delay);
80 rw_attribute(writeback_rate);
81
82 rw_attribute(writeback_rate_update_seconds);
83 rw_attribute(writeback_rate_d_term);
84 rw_attribute(writeback_rate_p_term_inverse);
85 read_attribute(writeback_rate_debug);
86
87 read_attribute(stripe_size);
88 read_attribute(partial_stripes_expensive);
89
90 rw_attribute(synchronous);
91 rw_attribute(journal_delay_ms);
92 rw_attribute(discard);
93 rw_attribute(running);
94 rw_attribute(label);
95 rw_attribute(readahead);
96 rw_attribute(errors);
97 rw_attribute(io_error_limit);
98 rw_attribute(io_error_halflife);
99 rw_attribute(verify);
100 rw_attribute(bypass_torture_test);
101 rw_attribute(key_merging_disabled);
102 rw_attribute(gc_always_rewrite);
103 rw_attribute(expensive_debug_checks);
104 rw_attribute(cache_replacement_policy);
105 rw_attribute(btree_shrinker_disabled);
106 rw_attribute(copy_gc_enabled);
107 rw_attribute(size);
108
109 SHOW(__bch_cached_dev)
110 {
111 struct cached_dev *dc = container_of(kobj, struct cached_dev,
112 disk.kobj);
113 const char *states[] = { "no cache", "clean", "dirty", "inconsistent" };
114
115 #define var(stat) (dc->stat)
116
117 if (attr == &sysfs_cache_mode)
118 return bch_snprint_string_list(buf, PAGE_SIZE,
119 bch_cache_modes + 1,
120 BDEV_CACHE_MODE(&dc->sb));
121
122 sysfs_printf(data_csum, "%i", dc->disk.data_csum);
123 var_printf(verify, "%i");
124 var_printf(bypass_torture_test, "%i");
125 var_printf(writeback_metadata, "%i");
126 var_printf(writeback_running, "%i");
127 var_print(writeback_delay);
128 var_print(writeback_percent);
129 sysfs_hprint(writeback_rate, dc->writeback_rate.rate << 9);
130
131 var_print(writeback_rate_update_seconds);
132 var_print(writeback_rate_d_term);
133 var_print(writeback_rate_p_term_inverse);
134
135 if (attr == &sysfs_writeback_rate_debug) {
136 char rate[20];
137 char dirty[20];
138 char target[20];
139 char proportional[20];
140 char derivative[20];
141 char change[20];
142 s64 next_io;
143
144 bch_hprint(rate, dc->writeback_rate.rate << 9);
145 bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9);
146 bch_hprint(target, dc->writeback_rate_target << 9);
147 bch_hprint(proportional,dc->writeback_rate_proportional << 9);
148 bch_hprint(derivative, dc->writeback_rate_derivative << 9);
149 bch_hprint(change, dc->writeback_rate_change << 9);
150
151 next_io = div64_s64(dc->writeback_rate.next - local_clock(),
152 NSEC_PER_MSEC);
153
154 return sprintf(buf,
155 "rate:\t\t%s/sec\n"
156 "dirty:\t\t%s\n"
157 "target:\t\t%s\n"
158 "proportional:\t%s\n"
159 "derivative:\t%s\n"
160 "change:\t\t%s/sec\n"
161 "next io:\t%llims\n",
162 rate, dirty, target, proportional,
163 derivative, change, next_io);
164 }
165
166 sysfs_hprint(dirty_data,
167 bcache_dev_sectors_dirty(&dc->disk) << 9);
168
169 sysfs_hprint(stripe_size, dc->disk.stripe_size << 9);
170 var_printf(partial_stripes_expensive, "%u");
171
172 var_hprint(sequential_cutoff);
173 var_hprint(readahead);
174
175 sysfs_print(running, atomic_read(&dc->running));
176 sysfs_print(state, states[BDEV_STATE(&dc->sb)]);
177
178 if (attr == &sysfs_label) {
179 memcpy(buf, dc->sb.label, SB_LABEL_SIZE);
180 buf[SB_LABEL_SIZE + 1] = '\0';
181 strcat(buf, "\n");
182 return strlen(buf);
183 }
184
185 #undef var
186 return 0;
187 }
188 SHOW_LOCKED(bch_cached_dev)
189
190 STORE(__cached_dev)
191 {
192 struct cached_dev *dc = container_of(kobj, struct cached_dev,
193 disk.kobj);
194 unsigned v = size;
195 struct cache_set *c;
196 struct kobj_uevent_env *env;
197
198 #define d_strtoul(var) sysfs_strtoul(var, dc->var)
199 #define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX)
200 #define d_strtoi_h(var) sysfs_hatoi(var, dc->var)
201
202 sysfs_strtoul(data_csum, dc->disk.data_csum);
203 d_strtoul(verify);
204 d_strtoul(bypass_torture_test);
205 d_strtoul(writeback_metadata);
206 d_strtoul(writeback_running);
207 d_strtoul(writeback_delay);
208
209 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40);
210
211 sysfs_strtoul_clamp(writeback_rate,
212 dc->writeback_rate.rate, 1, INT_MAX);
213
214 d_strtoul_nonzero(writeback_rate_update_seconds);
215 d_strtoul(writeback_rate_d_term);
216 d_strtoul_nonzero(writeback_rate_p_term_inverse);
217
218 d_strtoi_h(sequential_cutoff);
219 d_strtoi_h(readahead);
220
221 if (attr == &sysfs_clear_stats)
222 bch_cache_accounting_clear(&dc->accounting);
223
224 if (attr == &sysfs_running &&
225 strtoul_or_return(buf))
226 bch_cached_dev_run(dc);
227
228 if (attr == &sysfs_cache_mode) {
229 ssize_t v = bch_read_string_list(buf, bch_cache_modes + 1);
230
231 if (v < 0)
232 return v;
233
234 if ((unsigned) v != BDEV_CACHE_MODE(&dc->sb)) {
235 SET_BDEV_CACHE_MODE(&dc->sb, v);
236 bch_write_bdev_super(dc, NULL);
237 }
238 }
239
240 if (attr == &sysfs_label) {
241 if (size > SB_LABEL_SIZE)
242 return -EINVAL;
243 memcpy(dc->sb.label, buf, size);
244 if (size < SB_LABEL_SIZE)
245 dc->sb.label[size] = '\0';
246 if (size && dc->sb.label[size - 1] == '\n')
247 dc->sb.label[size - 1] = '\0';
248 bch_write_bdev_super(dc, NULL);
249 if (dc->disk.c) {
250 memcpy(dc->disk.c->uuids[dc->disk.id].label,
251 buf, SB_LABEL_SIZE);
252 bch_uuid_write(dc->disk.c);
253 }
254 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
255 if (!env)
256 return -ENOMEM;
257 add_uevent_var(env, "DRIVER=bcache");
258 add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid),
259 add_uevent_var(env, "CACHED_LABEL=%s", buf);
260 kobject_uevent_env(
261 &disk_to_dev(dc->disk.disk)->kobj, KOBJ_CHANGE, env->envp);
262 kfree(env);
263 }
264
265 if (attr == &sysfs_attach) {
266 if (bch_parse_uuid(buf, dc->sb.set_uuid) < 16)
267 return -EINVAL;
268
269 list_for_each_entry(c, &bch_cache_sets, list) {
270 v = bch_cached_dev_attach(dc, c);
271 if (!v)
272 return size;
273 }
274
275 pr_err("Can't attach %s: cache set not found", buf);
276 size = v;
277 }
278
279 if (attr == &sysfs_detach && dc->disk.c)
280 bch_cached_dev_detach(dc);
281
282 if (attr == &sysfs_stop)
283 bcache_device_stop(&dc->disk);
284
285 return size;
286 }
287
288 STORE(bch_cached_dev)
289 {
290 struct cached_dev *dc = container_of(kobj, struct cached_dev,
291 disk.kobj);
292
293 mutex_lock(&bch_register_lock);
294 size = __cached_dev_store(kobj, attr, buf, size);
295
296 if (attr == &sysfs_writeback_running)
297 bch_writeback_queue(dc);
298
299 if (attr == &sysfs_writeback_percent)
300 schedule_delayed_work(&dc->writeback_rate_update,
301 dc->writeback_rate_update_seconds * HZ);
302
303 mutex_unlock(&bch_register_lock);
304 return size;
305 }
306
307 static struct attribute *bch_cached_dev_files[] = {
308 &sysfs_attach,
309 &sysfs_detach,
310 &sysfs_stop,
311 #if 0
312 &sysfs_data_csum,
313 #endif
314 &sysfs_cache_mode,
315 &sysfs_writeback_metadata,
316 &sysfs_writeback_running,
317 &sysfs_writeback_delay,
318 &sysfs_writeback_percent,
319 &sysfs_writeback_rate,
320 &sysfs_writeback_rate_update_seconds,
321 &sysfs_writeback_rate_d_term,
322 &sysfs_writeback_rate_p_term_inverse,
323 &sysfs_writeback_rate_debug,
324 &sysfs_dirty_data,
325 &sysfs_stripe_size,
326 &sysfs_partial_stripes_expensive,
327 &sysfs_sequential_cutoff,
328 &sysfs_clear_stats,
329 &sysfs_running,
330 &sysfs_state,
331 &sysfs_label,
332 &sysfs_readahead,
333 #ifdef CONFIG_BCACHE_DEBUG
334 &sysfs_verify,
335 &sysfs_bypass_torture_test,
336 #endif
337 NULL
338 };
339 KTYPE(bch_cached_dev);
340
341 SHOW(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_printf(data_csum, "%i", d->data_csum);
348 sysfs_hprint(size, u->sectors << 9);
349
350 if (attr == &sysfs_label) {
351 memcpy(buf, u->label, SB_LABEL_SIZE);
352 buf[SB_LABEL_SIZE + 1] = '\0';
353 strcat(buf, "\n");
354 return strlen(buf);
355 }
356
357 return 0;
358 }
359
360 STORE(__bch_flash_dev)
361 {
362 struct bcache_device *d = container_of(kobj, struct bcache_device,
363 kobj);
364 struct uuid_entry *u = &d->c->uuids[d->id];
365
366 sysfs_strtoul(data_csum, d->data_csum);
367
368 if (attr == &sysfs_size) {
369 uint64_t v;
370 strtoi_h_or_return(buf, v);
371
372 u->sectors = v >> 9;
373 bch_uuid_write(d->c);
374 set_capacity(d->disk, u->sectors);
375 }
376
377 if (attr == &sysfs_label) {
378 memcpy(u->label, buf, SB_LABEL_SIZE);
379 bch_uuid_write(d->c);
380 }
381
382 if (attr == &sysfs_unregister) {
383 set_bit(BCACHE_DEV_DETACHING, &d->flags);
384 bcache_device_stop(d);
385 }
386
387 return size;
388 }
389 STORE_LOCKED(bch_flash_dev)
390
391 static struct attribute *bch_flash_dev_files[] = {
392 &sysfs_unregister,
393 #if 0
394 &sysfs_data_csum,
395 #endif
396 &sysfs_label,
397 &sysfs_size,
398 NULL
399 };
400 KTYPE(bch_flash_dev);
401
402 struct bset_stats_op {
403 struct btree_op op;
404 size_t nodes;
405 struct bset_stats stats;
406 };
407
408 static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b)
409 {
410 struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op);
411
412 op->nodes++;
413 bch_btree_keys_stats(&b->keys, &op->stats);
414
415 return MAP_CONTINUE;
416 }
417
418 static int bch_bset_print_stats(struct cache_set *c, char *buf)
419 {
420 struct bset_stats_op op;
421 int ret;
422
423 memset(&op, 0, sizeof(op));
424 bch_btree_op_init(&op.op, -1);
425
426 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats);
427 if (ret < 0)
428 return ret;
429
430 return snprintf(buf, PAGE_SIZE,
431 "btree nodes: %zu\n"
432 "written sets: %zu\n"
433 "unwritten sets: %zu\n"
434 "written key bytes: %zu\n"
435 "unwritten key bytes: %zu\n"
436 "floats: %zu\n"
437 "failed: %zu\n",
438 op.nodes,
439 op.stats.sets_written, op.stats.sets_unwritten,
440 op.stats.bytes_written, op.stats.bytes_unwritten,
441 op.stats.floats, op.stats.failed);
442 }
443
444 static unsigned bch_root_usage(struct cache_set *c)
445 {
446 unsigned bytes = 0;
447 struct bkey *k;
448 struct btree *b;
449 struct btree_iter iter;
450
451 goto lock_root;
452
453 do {
454 rw_unlock(false, b);
455 lock_root:
456 b = c->root;
457 rw_lock(false, b, b->level);
458 } while (b != c->root);
459
460 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad)
461 bytes += bkey_bytes(k);
462
463 rw_unlock(false, b);
464
465 return (bytes * 100) / btree_bytes(c);
466 }
467
468 static size_t bch_cache_size(struct cache_set *c)
469 {
470 size_t ret = 0;
471 struct btree *b;
472
473 mutex_lock(&c->bucket_lock);
474 list_for_each_entry(b, &c->btree_cache, list)
475 ret += 1 << (b->keys.page_order + PAGE_SHIFT);
476
477 mutex_unlock(&c->bucket_lock);
478 return ret;
479 }
480
481 static unsigned bch_cache_max_chain(struct cache_set *c)
482 {
483 unsigned ret = 0;
484 struct hlist_head *h;
485
486 mutex_lock(&c->bucket_lock);
487
488 for (h = c->bucket_hash;
489 h < c->bucket_hash + (1 << BUCKET_HASH_BITS);
490 h++) {
491 unsigned i = 0;
492 struct hlist_node *p;
493
494 hlist_for_each(p, h)
495 i++;
496
497 ret = max(ret, i);
498 }
499
500 mutex_unlock(&c->bucket_lock);
501 return ret;
502 }
503
504 static unsigned bch_btree_used(struct cache_set *c)
505 {
506 return div64_u64(c->gc_stats.key_bytes * 100,
507 (c->gc_stats.nodes ?: 1) * btree_bytes(c));
508 }
509
510 static unsigned bch_average_key_size(struct cache_set *c)
511 {
512 return c->gc_stats.nkeys
513 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys)
514 : 0;
515 }
516
517 SHOW(__bch_cache_set)
518 {
519 struct cache_set *c = container_of(kobj, struct cache_set, kobj);
520
521 sysfs_print(synchronous, CACHE_SYNC(&c->sb));
522 sysfs_print(journal_delay_ms, c->journal_delay_ms);
523 sysfs_hprint(bucket_size, bucket_bytes(c));
524 sysfs_hprint(block_size, block_bytes(c));
525 sysfs_print(tree_depth, c->root->level);
526 sysfs_print(root_usage_percent, bch_root_usage(c));
527
528 sysfs_hprint(btree_cache_size, bch_cache_size(c));
529 sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c));
530 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use);
531
532 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms);
533 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us);
534 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us);
535 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us);
536
537 sysfs_print(btree_used_percent, bch_btree_used(c));
538 sysfs_print(btree_nodes, c->gc_stats.nodes);
539 sysfs_hprint(average_key_size, bch_average_key_size(c));
540
541 sysfs_print(cache_read_races,
542 atomic_long_read(&c->cache_read_races));
543
544 sysfs_print(writeback_keys_done,
545 atomic_long_read(&c->writeback_keys_done));
546 sysfs_print(writeback_keys_failed,
547 atomic_long_read(&c->writeback_keys_failed));
548
549 if (attr == &sysfs_errors)
550 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions,
551 c->on_error);
552
553 /* See count_io_errors for why 88 */
554 sysfs_print(io_error_halflife, c->error_decay * 88);
555 sysfs_print(io_error_limit, c->error_limit >> IO_ERROR_SHIFT);
556
557 sysfs_hprint(congested,
558 ((uint64_t) bch_get_congested(c)) << 9);
559 sysfs_print(congested_read_threshold_us,
560 c->congested_read_threshold_us);
561 sysfs_print(congested_write_threshold_us,
562 c->congested_write_threshold_us);
563
564 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin));
565 sysfs_printf(verify, "%i", c->verify);
566 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled);
567 sysfs_printf(expensive_debug_checks,
568 "%i", c->expensive_debug_checks);
569 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite);
570 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled);
571 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled);
572
573 if (attr == &sysfs_bset_tree_stats)
574 return bch_bset_print_stats(c, buf);
575
576 return 0;
577 }
578 SHOW_LOCKED(bch_cache_set)
579
580 STORE(__bch_cache_set)
581 {
582 struct cache_set *c = container_of(kobj, struct cache_set, kobj);
583
584 if (attr == &sysfs_unregister)
585 bch_cache_set_unregister(c);
586
587 if (attr == &sysfs_stop)
588 bch_cache_set_stop(c);
589
590 if (attr == &sysfs_synchronous) {
591 bool sync = strtoul_or_return(buf);
592
593 if (sync != CACHE_SYNC(&c->sb)) {
594 SET_CACHE_SYNC(&c->sb, sync);
595 bcache_write_super(c);
596 }
597 }
598
599 if (attr == &sysfs_flash_vol_create) {
600 int r;
601 uint64_t v;
602 strtoi_h_or_return(buf, v);
603
604 r = bch_flash_dev_create(c, v);
605 if (r)
606 return r;
607 }
608
609 if (attr == &sysfs_clear_stats) {
610 atomic_long_set(&c->writeback_keys_done, 0);
611 atomic_long_set(&c->writeback_keys_failed, 0);
612
613 memset(&c->gc_stats, 0, sizeof(struct gc_stat));
614 bch_cache_accounting_clear(&c->accounting);
615 }
616
617 if (attr == &sysfs_trigger_gc)
618 wake_up_gc(c);
619
620 if (attr == &sysfs_prune_cache) {
621 struct shrink_control sc;
622 sc.gfp_mask = GFP_KERNEL;
623 sc.nr_to_scan = strtoul_or_return(buf);
624 c->shrink.scan_objects(&c->shrink, &sc);
625 }
626
627 sysfs_strtoul(congested_read_threshold_us,
628 c->congested_read_threshold_us);
629 sysfs_strtoul(congested_write_threshold_us,
630 c->congested_write_threshold_us);
631
632 if (attr == &sysfs_errors) {
633 ssize_t v = bch_read_string_list(buf, error_actions);
634
635 if (v < 0)
636 return v;
637
638 c->on_error = v;
639 }
640
641 if (attr == &sysfs_io_error_limit)
642 c->error_limit = strtoul_or_return(buf) << IO_ERROR_SHIFT;
643
644 /* See count_io_errors() for why 88 */
645 if (attr == &sysfs_io_error_halflife)
646 c->error_decay = strtoul_or_return(buf) / 88;
647
648 sysfs_strtoul(journal_delay_ms, c->journal_delay_ms);
649 sysfs_strtoul(verify, c->verify);
650 sysfs_strtoul(key_merging_disabled, c->key_merging_disabled);
651 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks);
652 sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite);
653 sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled);
654 sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled);
655
656 return size;
657 }
658 STORE_LOCKED(bch_cache_set)
659
660 SHOW(bch_cache_set_internal)
661 {
662 struct cache_set *c = container_of(kobj, struct cache_set, internal);
663 return bch_cache_set_show(&c->kobj, attr, buf);
664 }
665
666 STORE(bch_cache_set_internal)
667 {
668 struct cache_set *c = container_of(kobj, struct cache_set, internal);
669 return bch_cache_set_store(&c->kobj, attr, buf, size);
670 }
671
672 static void bch_cache_set_internal_release(struct kobject *k)
673 {
674 }
675
676 static struct attribute *bch_cache_set_files[] = {
677 &sysfs_unregister,
678 &sysfs_stop,
679 &sysfs_synchronous,
680 &sysfs_journal_delay_ms,
681 &sysfs_flash_vol_create,
682
683 &sysfs_bucket_size,
684 &sysfs_block_size,
685 &sysfs_tree_depth,
686 &sysfs_root_usage_percent,
687 &sysfs_btree_cache_size,
688 &sysfs_cache_available_percent,
689
690 &sysfs_average_key_size,
691
692 &sysfs_errors,
693 &sysfs_io_error_limit,
694 &sysfs_io_error_halflife,
695 &sysfs_congested,
696 &sysfs_congested_read_threshold_us,
697 &sysfs_congested_write_threshold_us,
698 &sysfs_clear_stats,
699 NULL
700 };
701 KTYPE(bch_cache_set);
702
703 static struct attribute *bch_cache_set_internal_files[] = {
704 &sysfs_active_journal_entries,
705
706 sysfs_time_stats_attribute_list(btree_gc, sec, ms)
707 sysfs_time_stats_attribute_list(btree_split, sec, us)
708 sysfs_time_stats_attribute_list(btree_sort, ms, us)
709 sysfs_time_stats_attribute_list(btree_read, ms, us)
710
711 &sysfs_btree_nodes,
712 &sysfs_btree_used_percent,
713 &sysfs_btree_cache_max_chain,
714
715 &sysfs_bset_tree_stats,
716 &sysfs_cache_read_races,
717 &sysfs_writeback_keys_done,
718 &sysfs_writeback_keys_failed,
719
720 &sysfs_trigger_gc,
721 &sysfs_prune_cache,
722 #ifdef CONFIG_BCACHE_DEBUG
723 &sysfs_verify,
724 &sysfs_key_merging_disabled,
725 &sysfs_expensive_debug_checks,
726 #endif
727 &sysfs_gc_always_rewrite,
728 &sysfs_btree_shrinker_disabled,
729 &sysfs_copy_gc_enabled,
730 NULL
731 };
732 KTYPE(bch_cache_set_internal);
733
734 SHOW(__bch_cache)
735 {
736 struct cache *ca = container_of(kobj, struct cache, kobj);
737
738 sysfs_hprint(bucket_size, bucket_bytes(ca));
739 sysfs_hprint(block_size, block_bytes(ca));
740 sysfs_print(nbuckets, ca->sb.nbuckets);
741 sysfs_print(discard, ca->discard);
742 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9);
743 sysfs_hprint(btree_written,
744 atomic_long_read(&ca->btree_sectors_written) << 9);
745 sysfs_hprint(metadata_written,
746 (atomic_long_read(&ca->meta_sectors_written) +
747 atomic_long_read(&ca->btree_sectors_written)) << 9);
748
749 sysfs_print(io_errors,
750 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT);
751
752 if (attr == &sysfs_cache_replacement_policy)
753 return bch_snprint_string_list(buf, PAGE_SIZE,
754 cache_replacement_policies,
755 CACHE_REPLACEMENT(&ca->sb));
756
757 if (attr == &sysfs_priority_stats) {
758 int cmp(const void *l, const void *r)
759 { return *((uint16_t *) r) - *((uint16_t *) l); }
760
761 struct bucket *b;
762 size_t n = ca->sb.nbuckets, i;
763 size_t unused = 0, available = 0, dirty = 0, meta = 0;
764 uint64_t sum = 0;
765 /* Compute 31 quantiles */
766 uint16_t q[31], *p, *cached;
767 ssize_t ret;
768
769 cached = p = vmalloc(ca->sb.nbuckets * sizeof(uint16_t));
770 if (!p)
771 return -ENOMEM;
772
773 mutex_lock(&ca->set->bucket_lock);
774 for_each_bucket(b, ca) {
775 if (!GC_SECTORS_USED(b))
776 unused++;
777 if (GC_MARK(b) == GC_MARK_RECLAIMABLE)
778 available++;
779 if (GC_MARK(b) == GC_MARK_DIRTY)
780 dirty++;
781 if (GC_MARK(b) == GC_MARK_METADATA)
782 meta++;
783 }
784
785 for (i = ca->sb.first_bucket; i < n; i++)
786 p[i] = ca->buckets[i].prio;
787 mutex_unlock(&ca->set->bucket_lock);
788
789 sort(p, n, sizeof(uint16_t), cmp, NULL);
790
791 while (n &&
792 !cached[n - 1])
793 --n;
794
795 unused = ca->sb.nbuckets - n;
796
797 while (cached < p + n &&
798 *cached == BTREE_PRIO)
799 cached++, n--;
800
801 for (i = 0; i < n; i++)
802 sum += INITIAL_PRIO - cached[i];
803
804 if (n)
805 do_div(sum, n);
806
807 for (i = 0; i < ARRAY_SIZE(q); i++)
808 q[i] = INITIAL_PRIO - cached[n * (i + 1) /
809 (ARRAY_SIZE(q) + 1)];
810
811 vfree(p);
812
813 ret = scnprintf(buf, PAGE_SIZE,
814 "Unused: %zu%%\n"
815 "Clean: %zu%%\n"
816 "Dirty: %zu%%\n"
817 "Metadata: %zu%%\n"
818 "Average: %llu\n"
819 "Sectors per Q: %zu\n"
820 "Quantiles: [",
821 unused * 100 / (size_t) ca->sb.nbuckets,
822 available * 100 / (size_t) ca->sb.nbuckets,
823 dirty * 100 / (size_t) ca->sb.nbuckets,
824 meta * 100 / (size_t) ca->sb.nbuckets, sum,
825 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
826
827 for (i = 0; i < ARRAY_SIZE(q); i++)
828 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
829 "%u ", q[i]);
830 ret--;
831
832 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n");
833
834 return ret;
835 }
836
837 return 0;
838 }
839 SHOW_LOCKED(bch_cache)
840
841 STORE(__bch_cache)
842 {
843 struct cache *ca = container_of(kobj, struct cache, kobj);
844
845 if (attr == &sysfs_discard) {
846 bool v = strtoul_or_return(buf);
847
848 if (blk_queue_discard(bdev_get_queue(ca->bdev)))
849 ca->discard = v;
850
851 if (v != CACHE_DISCARD(&ca->sb)) {
852 SET_CACHE_DISCARD(&ca->sb, v);
853 bcache_write_super(ca->set);
854 }
855 }
856
857 if (attr == &sysfs_cache_replacement_policy) {
858 ssize_t v = bch_read_string_list(buf, cache_replacement_policies);
859
860 if (v < 0)
861 return v;
862
863 if ((unsigned) v != CACHE_REPLACEMENT(&ca->sb)) {
864 mutex_lock(&ca->set->bucket_lock);
865 SET_CACHE_REPLACEMENT(&ca->sb, v);
866 mutex_unlock(&ca->set->bucket_lock);
867
868 bcache_write_super(ca->set);
869 }
870 }
871
872 if (attr == &sysfs_clear_stats) {
873 atomic_long_set(&ca->sectors_written, 0);
874 atomic_long_set(&ca->btree_sectors_written, 0);
875 atomic_long_set(&ca->meta_sectors_written, 0);
876 atomic_set(&ca->io_count, 0);
877 atomic_set(&ca->io_errors, 0);
878 }
879
880 return size;
881 }
882 STORE_LOCKED(bch_cache)
883
884 static struct attribute *bch_cache_files[] = {
885 &sysfs_bucket_size,
886 &sysfs_block_size,
887 &sysfs_nbuckets,
888 &sysfs_priority_stats,
889 &sysfs_discard,
890 &sysfs_written,
891 &sysfs_btree_written,
892 &sysfs_metadata_written,
893 &sysfs_io_errors,
894 &sysfs_clear_stats,
895 &sysfs_cache_replacement_policy,
896 NULL
897 };
898 KTYPE(bch_cache);
Linux kernel - Deliverables
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