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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
cafe5635 KO |
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" | |
279afbad | 13 | #include "writeback.h" |
cafe5635 | 14 | |
c37511b8 | 15 | #include <linux/blkdev.h> |
cafe5635 | 16 | #include <linux/sort.h> |
e6017571 | 17 | #include <linux/sched/clock.h> |
cafe5635 KO |
18 | |
19 | static const char * const cache_replacement_policies[] = { | |
20 | "lru", | |
21 | "fifo", | |
22 | "random", | |
23 | NULL | |
24 | }; | |
25 | ||
77c320eb KO |
26 | static const char * const error_actions[] = { |
27 | "unregister", | |
28 | "panic", | |
29 | NULL | |
30 | }; | |
31 | ||
cafe5635 KO |
32 | write_attribute(attach); |
33 | write_attribute(detach); | |
34 | write_attribute(unregister); | |
35 | write_attribute(stop); | |
36 | write_attribute(clear_stats); | |
37 | write_attribute(trigger_gc); | |
38 | write_attribute(prune_cache); | |
39 | write_attribute(flash_vol_create); | |
40 | ||
41 | read_attribute(bucket_size); | |
42 | read_attribute(block_size); | |
43 | read_attribute(nbuckets); | |
44 | read_attribute(tree_depth); | |
45 | read_attribute(root_usage_percent); | |
46 | read_attribute(priority_stats); | |
47 | read_attribute(btree_cache_size); | |
48 | read_attribute(btree_cache_max_chain); | |
49 | read_attribute(cache_available_percent); | |
50 | read_attribute(written); | |
51 | read_attribute(btree_written); | |
52 | read_attribute(metadata_written); | |
53 | read_attribute(active_journal_entries); | |
54 | ||
55 | sysfs_time_stats_attribute(btree_gc, sec, ms); | |
56 | sysfs_time_stats_attribute(btree_split, sec, us); | |
57 | sysfs_time_stats_attribute(btree_sort, ms, us); | |
58 | sysfs_time_stats_attribute(btree_read, ms, us); | |
cafe5635 KO |
59 | |
60 | read_attribute(btree_nodes); | |
61 | read_attribute(btree_used_percent); | |
62 | read_attribute(average_key_size); | |
63 | read_attribute(dirty_data); | |
64 | read_attribute(bset_tree_stats); | |
65 | ||
66 | read_attribute(state); | |
67 | read_attribute(cache_read_races); | |
68 | read_attribute(writeback_keys_done); | |
69 | read_attribute(writeback_keys_failed); | |
70 | read_attribute(io_errors); | |
71 | read_attribute(congested); | |
72 | rw_attribute(congested_read_threshold_us); | |
73 | rw_attribute(congested_write_threshold_us); | |
74 | ||
75 | rw_attribute(sequential_cutoff); | |
cafe5635 KO |
76 | rw_attribute(data_csum); |
77 | rw_attribute(cache_mode); | |
78 | rw_attribute(writeback_metadata); | |
79 | rw_attribute(writeback_running); | |
80 | rw_attribute(writeback_percent); | |
81 | rw_attribute(writeback_delay); | |
82 | rw_attribute(writeback_rate); | |
83 | ||
84 | rw_attribute(writeback_rate_update_seconds); | |
85 | rw_attribute(writeback_rate_d_term); | |
86 | rw_attribute(writeback_rate_p_term_inverse); | |
cafe5635 KO |
87 | read_attribute(writeback_rate_debug); |
88 | ||
72c27061 KO |
89 | read_attribute(stripe_size); |
90 | read_attribute(partial_stripes_expensive); | |
91 | ||
cafe5635 KO |
92 | rw_attribute(synchronous); |
93 | rw_attribute(journal_delay_ms); | |
94 | rw_attribute(discard); | |
95 | rw_attribute(running); | |
96 | rw_attribute(label); | |
97 | rw_attribute(readahead); | |
77c320eb | 98 | rw_attribute(errors); |
cafe5635 KO |
99 | rw_attribute(io_error_limit); |
100 | rw_attribute(io_error_halflife); | |
101 | rw_attribute(verify); | |
5ceaaad7 | 102 | rw_attribute(bypass_torture_test); |
cafe5635 KO |
103 | rw_attribute(key_merging_disabled); |
104 | rw_attribute(gc_always_rewrite); | |
280481d0 | 105 | rw_attribute(expensive_debug_checks); |
cafe5635 KO |
106 | rw_attribute(cache_replacement_policy); |
107 | rw_attribute(btree_shrinker_disabled); | |
108 | rw_attribute(copy_gc_enabled); | |
109 | rw_attribute(size); | |
110 | ||
111 | SHOW(__bch_cached_dev) | |
112 | { | |
113 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
114 | disk.kobj); | |
115 | const char *states[] = { "no cache", "clean", "dirty", "inconsistent" }; | |
116 | ||
117 | #define var(stat) (dc->stat) | |
118 | ||
119 | if (attr == &sysfs_cache_mode) | |
169ef1cf KO |
120 | return bch_snprint_string_list(buf, PAGE_SIZE, |
121 | bch_cache_modes + 1, | |
122 | BDEV_CACHE_MODE(&dc->sb)); | |
cafe5635 KO |
123 | |
124 | sysfs_printf(data_csum, "%i", dc->disk.data_csum); | |
125 | var_printf(verify, "%i"); | |
5ceaaad7 | 126 | var_printf(bypass_torture_test, "%i"); |
cafe5635 KO |
127 | var_printf(writeback_metadata, "%i"); |
128 | var_printf(writeback_running, "%i"); | |
129 | var_print(writeback_delay); | |
130 | var_print(writeback_percent); | |
16749c23 | 131 | sysfs_hprint(writeback_rate, dc->writeback_rate.rate << 9); |
cafe5635 KO |
132 | |
133 | var_print(writeback_rate_update_seconds); | |
134 | var_print(writeback_rate_d_term); | |
135 | var_print(writeback_rate_p_term_inverse); | |
cafe5635 KO |
136 | |
137 | if (attr == &sysfs_writeback_rate_debug) { | |
16749c23 | 138 | char rate[20]; |
cafe5635 | 139 | char dirty[20]; |
cafe5635 | 140 | char target[20]; |
16749c23 KO |
141 | char proportional[20]; |
142 | char derivative[20]; | |
143 | char change[20]; | |
144 | s64 next_io; | |
145 | ||
146 | bch_hprint(rate, dc->writeback_rate.rate << 9); | |
147 | bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9); | |
169ef1cf | 148 | bch_hprint(target, dc->writeback_rate_target << 9); |
16749c23 KO |
149 | bch_hprint(proportional,dc->writeback_rate_proportional << 9); |
150 | bch_hprint(derivative, dc->writeback_rate_derivative << 9); | |
151 | bch_hprint(change, dc->writeback_rate_change << 9); | |
152 | ||
153 | next_io = div64_s64(dc->writeback_rate.next - local_clock(), | |
154 | NSEC_PER_MSEC); | |
cafe5635 KO |
155 | |
156 | return sprintf(buf, | |
16749c23 | 157 | "rate:\t\t%s/sec\n" |
cafe5635 | 158 | "dirty:\t\t%s\n" |
16749c23 KO |
159 | "target:\t\t%s\n" |
160 | "proportional:\t%s\n" | |
cafe5635 | 161 | "derivative:\t%s\n" |
16749c23 KO |
162 | "change:\t\t%s/sec\n" |
163 | "next io:\t%llims\n", | |
164 | rate, dirty, target, proportional, | |
165 | derivative, change, next_io); | |
cafe5635 KO |
166 | } |
167 | ||
168 | sysfs_hprint(dirty_data, | |
279afbad | 169 | bcache_dev_sectors_dirty(&dc->disk) << 9); |
cafe5635 | 170 | |
2d679fc7 | 171 | sysfs_hprint(stripe_size, dc->disk.stripe_size << 9); |
72c27061 KO |
172 | var_printf(partial_stripes_expensive, "%u"); |
173 | ||
cafe5635 KO |
174 | var_hprint(sequential_cutoff); |
175 | var_hprint(readahead); | |
176 | ||
177 | sysfs_print(running, atomic_read(&dc->running)); | |
178 | sysfs_print(state, states[BDEV_STATE(&dc->sb)]); | |
179 | ||
180 | if (attr == &sysfs_label) { | |
181 | memcpy(buf, dc->sb.label, SB_LABEL_SIZE); | |
182 | buf[SB_LABEL_SIZE + 1] = '\0'; | |
183 | strcat(buf, "\n"); | |
184 | return strlen(buf); | |
185 | } | |
186 | ||
187 | #undef var | |
188 | return 0; | |
189 | } | |
190 | SHOW_LOCKED(bch_cached_dev) | |
191 | ||
192 | STORE(__cached_dev) | |
193 | { | |
194 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
195 | disk.kobj); | |
77fa100f | 196 | ssize_t v = size; |
cafe5635 | 197 | struct cache_set *c; |
ab9e1400 | 198 | struct kobj_uevent_env *env; |
cafe5635 KO |
199 | |
200 | #define d_strtoul(var) sysfs_strtoul(var, dc->var) | |
16749c23 | 201 | #define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX) |
cafe5635 KO |
202 | #define d_strtoi_h(var) sysfs_hatoi(var, dc->var) |
203 | ||
204 | sysfs_strtoul(data_csum, dc->disk.data_csum); | |
205 | d_strtoul(verify); | |
5ceaaad7 | 206 | d_strtoul(bypass_torture_test); |
cafe5635 KO |
207 | d_strtoul(writeback_metadata); |
208 | d_strtoul(writeback_running); | |
209 | d_strtoul(writeback_delay); | |
16749c23 | 210 | |
cafe5635 KO |
211 | sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40); |
212 | ||
16749c23 KO |
213 | sysfs_strtoul_clamp(writeback_rate, |
214 | dc->writeback_rate.rate, 1, INT_MAX); | |
215 | ||
216 | d_strtoul_nonzero(writeback_rate_update_seconds); | |
cafe5635 | 217 | d_strtoul(writeback_rate_d_term); |
16749c23 | 218 | d_strtoul_nonzero(writeback_rate_p_term_inverse); |
cafe5635 | 219 | |
cafe5635 KO |
220 | d_strtoi_h(sequential_cutoff); |
221 | d_strtoi_h(readahead); | |
222 | ||
223 | if (attr == &sysfs_clear_stats) | |
224 | bch_cache_accounting_clear(&dc->accounting); | |
225 | ||
226 | if (attr == &sysfs_running && | |
227 | strtoul_or_return(buf)) | |
228 | bch_cached_dev_run(dc); | |
229 | ||
230 | if (attr == &sysfs_cache_mode) { | |
77fa100f | 231 | v = bch_read_string_list(buf, bch_cache_modes + 1); |
cafe5635 KO |
232 | |
233 | if (v < 0) | |
234 | return v; | |
235 | ||
236 | if ((unsigned) v != BDEV_CACHE_MODE(&dc->sb)) { | |
237 | SET_BDEV_CACHE_MODE(&dc->sb, v); | |
238 | bch_write_bdev_super(dc, NULL); | |
239 | } | |
240 | } | |
241 | ||
242 | if (attr == &sysfs_label) { | |
aee6f1cf GP |
243 | if (size > SB_LABEL_SIZE) |
244 | return -EINVAL; | |
245 | memcpy(dc->sb.label, buf, size); | |
246 | if (size < SB_LABEL_SIZE) | |
247 | dc->sb.label[size] = '\0'; | |
248 | if (size && dc->sb.label[size - 1] == '\n') | |
249 | dc->sb.label[size - 1] = '\0'; | |
cafe5635 KO |
250 | bch_write_bdev_super(dc, NULL); |
251 | if (dc->disk.c) { | |
252 | memcpy(dc->disk.c->uuids[dc->disk.id].label, | |
253 | buf, SB_LABEL_SIZE); | |
254 | bch_uuid_write(dc->disk.c); | |
255 | } | |
ab9e1400 | 256 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
d2a65ce2 DC |
257 | if (!env) |
258 | return -ENOMEM; | |
ab9e1400 GP |
259 | add_uevent_var(env, "DRIVER=bcache"); |
260 | add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid), | |
261 | add_uevent_var(env, "CACHED_LABEL=%s", buf); | |
262 | kobject_uevent_env( | |
263 | &disk_to_dev(dc->disk.disk)->kobj, KOBJ_CHANGE, env->envp); | |
264 | kfree(env); | |
cafe5635 KO |
265 | } |
266 | ||
267 | if (attr == &sysfs_attach) { | |
169ef1cf | 268 | if (bch_parse_uuid(buf, dc->sb.set_uuid) < 16) |
cafe5635 KO |
269 | return -EINVAL; |
270 | ||
271 | list_for_each_entry(c, &bch_cache_sets, list) { | |
272 | v = bch_cached_dev_attach(dc, c); | |
273 | if (!v) | |
274 | return size; | |
275 | } | |
276 | ||
277 | pr_err("Can't attach %s: cache set not found", buf); | |
278 | size = v; | |
279 | } | |
280 | ||
281 | if (attr == &sysfs_detach && dc->disk.c) | |
282 | bch_cached_dev_detach(dc); | |
283 | ||
284 | if (attr == &sysfs_stop) | |
285 | bcache_device_stop(&dc->disk); | |
286 | ||
287 | return size; | |
288 | } | |
289 | ||
290 | STORE(bch_cached_dev) | |
291 | { | |
292 | struct cached_dev *dc = container_of(kobj, struct cached_dev, | |
293 | disk.kobj); | |
294 | ||
295 | mutex_lock(&bch_register_lock); | |
296 | size = __cached_dev_store(kobj, attr, buf, size); | |
297 | ||
298 | if (attr == &sysfs_writeback_running) | |
299 | bch_writeback_queue(dc); | |
300 | ||
301 | if (attr == &sysfs_writeback_percent) | |
302 | schedule_delayed_work(&dc->writeback_rate_update, | |
303 | dc->writeback_rate_update_seconds * HZ); | |
304 | ||
305 | mutex_unlock(&bch_register_lock); | |
306 | return size; | |
307 | } | |
308 | ||
309 | static struct attribute *bch_cached_dev_files[] = { | |
310 | &sysfs_attach, | |
311 | &sysfs_detach, | |
312 | &sysfs_stop, | |
313 | #if 0 | |
314 | &sysfs_data_csum, | |
315 | #endif | |
316 | &sysfs_cache_mode, | |
317 | &sysfs_writeback_metadata, | |
318 | &sysfs_writeback_running, | |
319 | &sysfs_writeback_delay, | |
320 | &sysfs_writeback_percent, | |
321 | &sysfs_writeback_rate, | |
322 | &sysfs_writeback_rate_update_seconds, | |
323 | &sysfs_writeback_rate_d_term, | |
324 | &sysfs_writeback_rate_p_term_inverse, | |
cafe5635 KO |
325 | &sysfs_writeback_rate_debug, |
326 | &sysfs_dirty_data, | |
72c27061 KO |
327 | &sysfs_stripe_size, |
328 | &sysfs_partial_stripes_expensive, | |
cafe5635 | 329 | &sysfs_sequential_cutoff, |
cafe5635 KO |
330 | &sysfs_clear_stats, |
331 | &sysfs_running, | |
332 | &sysfs_state, | |
333 | &sysfs_label, | |
334 | &sysfs_readahead, | |
335 | #ifdef CONFIG_BCACHE_DEBUG | |
336 | &sysfs_verify, | |
5ceaaad7 | 337 | &sysfs_bypass_torture_test, |
cafe5635 KO |
338 | #endif |
339 | NULL | |
340 | }; | |
341 | KTYPE(bch_cached_dev); | |
342 | ||
343 | SHOW(bch_flash_dev) | |
344 | { | |
345 | struct bcache_device *d = container_of(kobj, struct bcache_device, | |
346 | kobj); | |
347 | struct uuid_entry *u = &d->c->uuids[d->id]; | |
348 | ||
349 | sysfs_printf(data_csum, "%i", d->data_csum); | |
350 | sysfs_hprint(size, u->sectors << 9); | |
351 | ||
352 | if (attr == &sysfs_label) { | |
353 | memcpy(buf, u->label, SB_LABEL_SIZE); | |
354 | buf[SB_LABEL_SIZE + 1] = '\0'; | |
355 | strcat(buf, "\n"); | |
356 | return strlen(buf); | |
357 | } | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | STORE(__bch_flash_dev) | |
363 | { | |
364 | struct bcache_device *d = container_of(kobj, struct bcache_device, | |
365 | kobj); | |
366 | struct uuid_entry *u = &d->c->uuids[d->id]; | |
367 | ||
368 | sysfs_strtoul(data_csum, d->data_csum); | |
369 | ||
370 | if (attr == &sysfs_size) { | |
371 | uint64_t v; | |
372 | strtoi_h_or_return(buf, v); | |
373 | ||
374 | u->sectors = v >> 9; | |
375 | bch_uuid_write(d->c); | |
376 | set_capacity(d->disk, u->sectors); | |
377 | } | |
378 | ||
379 | if (attr == &sysfs_label) { | |
380 | memcpy(u->label, buf, SB_LABEL_SIZE); | |
381 | bch_uuid_write(d->c); | |
382 | } | |
383 | ||
384 | if (attr == &sysfs_unregister) { | |
c4d951dd | 385 | set_bit(BCACHE_DEV_DETACHING, &d->flags); |
cafe5635 KO |
386 | bcache_device_stop(d); |
387 | } | |
388 | ||
389 | return size; | |
390 | } | |
391 | STORE_LOCKED(bch_flash_dev) | |
392 | ||
393 | static struct attribute *bch_flash_dev_files[] = { | |
394 | &sysfs_unregister, | |
395 | #if 0 | |
396 | &sysfs_data_csum, | |
397 | #endif | |
398 | &sysfs_label, | |
399 | &sysfs_size, | |
400 | NULL | |
401 | }; | |
402 | KTYPE(bch_flash_dev); | |
403 | ||
f67342dd KO |
404 | struct bset_stats_op { |
405 | struct btree_op op; | |
406 | size_t nodes; | |
407 | struct bset_stats stats; | |
408 | }; | |
409 | ||
cb851149 | 410 | static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b) |
f67342dd KO |
411 | { |
412 | struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op); | |
413 | ||
414 | op->nodes++; | |
415 | bch_btree_keys_stats(&b->keys, &op->stats); | |
416 | ||
417 | return MAP_CONTINUE; | |
418 | } | |
419 | ||
3572324a | 420 | static int bch_bset_print_stats(struct cache_set *c, char *buf) |
f67342dd KO |
421 | { |
422 | struct bset_stats_op op; | |
423 | int ret; | |
424 | ||
425 | memset(&op, 0, sizeof(op)); | |
426 | bch_btree_op_init(&op.op, -1); | |
427 | ||
cb851149 | 428 | ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats); |
f67342dd KO |
429 | if (ret < 0) |
430 | return ret; | |
431 | ||
432 | return snprintf(buf, PAGE_SIZE, | |
433 | "btree nodes: %zu\n" | |
434 | "written sets: %zu\n" | |
435 | "unwritten sets: %zu\n" | |
436 | "written key bytes: %zu\n" | |
437 | "unwritten key bytes: %zu\n" | |
438 | "floats: %zu\n" | |
439 | "failed: %zu\n", | |
440 | op.nodes, | |
441 | op.stats.sets_written, op.stats.sets_unwritten, | |
442 | op.stats.bytes_written, op.stats.bytes_unwritten, | |
443 | op.stats.floats, op.stats.failed); | |
444 | } | |
445 | ||
cb851149 | 446 | static unsigned bch_root_usage(struct cache_set *c) |
cafe5635 | 447 | { |
cb851149 JS |
448 | unsigned bytes = 0; |
449 | struct bkey *k; | |
450 | struct btree *b; | |
451 | struct btree_iter iter; | |
cafe5635 | 452 | |
cb851149 | 453 | goto lock_root; |
cafe5635 | 454 | |
cb851149 JS |
455 | do { |
456 | rw_unlock(false, b); | |
cafe5635 | 457 | lock_root: |
cb851149 JS |
458 | b = c->root; |
459 | rw_lock(false, b, b->level); | |
460 | } while (b != c->root); | |
cafe5635 | 461 | |
cb851149 JS |
462 | for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) |
463 | bytes += bkey_bytes(k); | |
cafe5635 | 464 | |
cb851149 | 465 | rw_unlock(false, b); |
cafe5635 | 466 | |
cb851149 JS |
467 | return (bytes * 100) / btree_bytes(c); |
468 | } | |
cafe5635 | 469 | |
cb851149 JS |
470 | static size_t bch_cache_size(struct cache_set *c) |
471 | { | |
472 | size_t ret = 0; | |
473 | struct btree *b; | |
cafe5635 | 474 | |
cb851149 JS |
475 | mutex_lock(&c->bucket_lock); |
476 | list_for_each_entry(b, &c->btree_cache, list) | |
477 | ret += 1 << (b->keys.page_order + PAGE_SHIFT); | |
cafe5635 | 478 | |
cb851149 JS |
479 | mutex_unlock(&c->bucket_lock); |
480 | return ret; | |
481 | } | |
cafe5635 | 482 | |
cb851149 JS |
483 | static unsigned bch_cache_max_chain(struct cache_set *c) |
484 | { | |
485 | unsigned ret = 0; | |
486 | struct hlist_head *h; | |
cafe5635 | 487 | |
cb851149 | 488 | mutex_lock(&c->bucket_lock); |
cafe5635 | 489 | |
cb851149 JS |
490 | for (h = c->bucket_hash; |
491 | h < c->bucket_hash + (1 << BUCKET_HASH_BITS); | |
492 | h++) { | |
493 | unsigned i = 0; | |
494 | struct hlist_node *p; | |
cafe5635 | 495 | |
cb851149 JS |
496 | hlist_for_each(p, h) |
497 | i++; | |
cafe5635 | 498 | |
cb851149 | 499 | ret = max(ret, i); |
cafe5635 KO |
500 | } |
501 | ||
cb851149 JS |
502 | mutex_unlock(&c->bucket_lock); |
503 | return ret; | |
504 | } | |
cafe5635 | 505 | |
cb851149 JS |
506 | static unsigned bch_btree_used(struct cache_set *c) |
507 | { | |
508 | return div64_u64(c->gc_stats.key_bytes * 100, | |
509 | (c->gc_stats.nodes ?: 1) * btree_bytes(c)); | |
510 | } | |
cafe5635 | 511 | |
cb851149 JS |
512 | static unsigned bch_average_key_size(struct cache_set *c) |
513 | { | |
514 | return c->gc_stats.nkeys | |
515 | ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) | |
516 | : 0; | |
517 | } | |
518 | ||
519 | SHOW(__bch_cache_set) | |
520 | { | |
cafe5635 KO |
521 | struct cache_set *c = container_of(kobj, struct cache_set, kobj); |
522 | ||
523 | sysfs_print(synchronous, CACHE_SYNC(&c->sb)); | |
524 | sysfs_print(journal_delay_ms, c->journal_delay_ms); | |
525 | sysfs_hprint(bucket_size, bucket_bytes(c)); | |
526 | sysfs_hprint(block_size, block_bytes(c)); | |
527 | sysfs_print(tree_depth, c->root->level); | |
cb851149 | 528 | sysfs_print(root_usage_percent, bch_root_usage(c)); |
cafe5635 | 529 | |
cb851149 JS |
530 | sysfs_hprint(btree_cache_size, bch_cache_size(c)); |
531 | sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c)); | |
cafe5635 KO |
532 | sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use); |
533 | ||
534 | sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms); | |
535 | sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us); | |
67539e85 | 536 | sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us); |
cafe5635 | 537 | sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); |
cafe5635 | 538 | |
cb851149 | 539 | sysfs_print(btree_used_percent, bch_btree_used(c)); |
cafe5635 | 540 | sysfs_print(btree_nodes, c->gc_stats.nodes); |
cb851149 | 541 | sysfs_hprint(average_key_size, bch_average_key_size(c)); |
cafe5635 KO |
542 | |
543 | sysfs_print(cache_read_races, | |
544 | atomic_long_read(&c->cache_read_races)); | |
545 | ||
546 | sysfs_print(writeback_keys_done, | |
547 | atomic_long_read(&c->writeback_keys_done)); | |
548 | sysfs_print(writeback_keys_failed, | |
549 | atomic_long_read(&c->writeback_keys_failed)); | |
550 | ||
77c320eb KO |
551 | if (attr == &sysfs_errors) |
552 | return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, | |
553 | c->on_error); | |
554 | ||
cafe5635 KO |
555 | /* See count_io_errors for why 88 */ |
556 | sysfs_print(io_error_halflife, c->error_decay * 88); | |
557 | sysfs_print(io_error_limit, c->error_limit >> IO_ERROR_SHIFT); | |
558 | ||
559 | sysfs_hprint(congested, | |
560 | ((uint64_t) bch_get_congested(c)) << 9); | |
561 | sysfs_print(congested_read_threshold_us, | |
562 | c->congested_read_threshold_us); | |
563 | sysfs_print(congested_write_threshold_us, | |
564 | c->congested_write_threshold_us); | |
565 | ||
566 | sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); | |
567 | sysfs_printf(verify, "%i", c->verify); | |
568 | sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); | |
280481d0 KO |
569 | sysfs_printf(expensive_debug_checks, |
570 | "%i", c->expensive_debug_checks); | |
cafe5635 KO |
571 | sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); |
572 | sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); | |
573 | sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); | |
574 | ||
575 | if (attr == &sysfs_bset_tree_stats) | |
576 | return bch_bset_print_stats(c, buf); | |
577 | ||
578 | return 0; | |
579 | } | |
580 | SHOW_LOCKED(bch_cache_set) | |
581 | ||
582 | STORE(__bch_cache_set) | |
583 | { | |
584 | struct cache_set *c = container_of(kobj, struct cache_set, kobj); | |
585 | ||
586 | if (attr == &sysfs_unregister) | |
587 | bch_cache_set_unregister(c); | |
588 | ||
589 | if (attr == &sysfs_stop) | |
590 | bch_cache_set_stop(c); | |
591 | ||
592 | if (attr == &sysfs_synchronous) { | |
593 | bool sync = strtoul_or_return(buf); | |
594 | ||
595 | if (sync != CACHE_SYNC(&c->sb)) { | |
596 | SET_CACHE_SYNC(&c->sb, sync); | |
597 | bcache_write_super(c); | |
598 | } | |
599 | } | |
600 | ||
601 | if (attr == &sysfs_flash_vol_create) { | |
602 | int r; | |
603 | uint64_t v; | |
604 | strtoi_h_or_return(buf, v); | |
605 | ||
606 | r = bch_flash_dev_create(c, v); | |
607 | if (r) | |
608 | return r; | |
609 | } | |
610 | ||
611 | if (attr == &sysfs_clear_stats) { | |
612 | atomic_long_set(&c->writeback_keys_done, 0); | |
613 | atomic_long_set(&c->writeback_keys_failed, 0); | |
614 | ||
615 | memset(&c->gc_stats, 0, sizeof(struct gc_stat)); | |
616 | bch_cache_accounting_clear(&c->accounting); | |
617 | } | |
618 | ||
0b43f49d TJ |
619 | if (attr == &sysfs_trigger_gc) { |
620 | /* | |
621 | * Garbage collection thread only works when sectors_to_gc < 0, | |
622 | * when users write to sysfs entry trigger_gc, most of time | |
623 | * they want to forcibly triger gargage collection. Here -1 is | |
624 | * set to c->sectors_to_gc, to make gc_should_run() give a | |
625 | * chance to permit gc thread to run. "give a chance" means | |
626 | * before going into gc_should_run(), there is still chance | |
627 | * that c->sectors_to_gc being set to other positive value. So | |
628 | * writing sysfs entry trigger_gc won't always make sure gc | |
629 | * thread takes effect. | |
630 | */ | |
631 | atomic_set(&c->sectors_to_gc, -1); | |
72a44517 | 632 | wake_up_gc(c); |
0b43f49d | 633 | } |
cafe5635 KO |
634 | |
635 | if (attr == &sysfs_prune_cache) { | |
636 | struct shrink_control sc; | |
637 | sc.gfp_mask = GFP_KERNEL; | |
638 | sc.nr_to_scan = strtoul_or_return(buf); | |
7dc19d5a | 639 | c->shrink.scan_objects(&c->shrink, &sc); |
cafe5635 KO |
640 | } |
641 | ||
642 | sysfs_strtoul(congested_read_threshold_us, | |
643 | c->congested_read_threshold_us); | |
644 | sysfs_strtoul(congested_write_threshold_us, | |
645 | c->congested_write_threshold_us); | |
646 | ||
77c320eb KO |
647 | if (attr == &sysfs_errors) { |
648 | ssize_t v = bch_read_string_list(buf, error_actions); | |
649 | ||
650 | if (v < 0) | |
651 | return v; | |
652 | ||
653 | c->on_error = v; | |
654 | } | |
655 | ||
cafe5635 KO |
656 | if (attr == &sysfs_io_error_limit) |
657 | c->error_limit = strtoul_or_return(buf) << IO_ERROR_SHIFT; | |
658 | ||
659 | /* See count_io_errors() for why 88 */ | |
660 | if (attr == &sysfs_io_error_halflife) | |
661 | c->error_decay = strtoul_or_return(buf) / 88; | |
662 | ||
663 | sysfs_strtoul(journal_delay_ms, c->journal_delay_ms); | |
664 | sysfs_strtoul(verify, c->verify); | |
665 | sysfs_strtoul(key_merging_disabled, c->key_merging_disabled); | |
280481d0 | 666 | sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); |
cafe5635 KO |
667 | sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite); |
668 | sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled); | |
669 | sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled); | |
670 | ||
671 | return size; | |
672 | } | |
673 | STORE_LOCKED(bch_cache_set) | |
674 | ||
675 | SHOW(bch_cache_set_internal) | |
676 | { | |
677 | struct cache_set *c = container_of(kobj, struct cache_set, internal); | |
678 | return bch_cache_set_show(&c->kobj, attr, buf); | |
679 | } | |
680 | ||
681 | STORE(bch_cache_set_internal) | |
682 | { | |
683 | struct cache_set *c = container_of(kobj, struct cache_set, internal); | |
684 | return bch_cache_set_store(&c->kobj, attr, buf, size); | |
685 | } | |
686 | ||
687 | static void bch_cache_set_internal_release(struct kobject *k) | |
688 | { | |
689 | } | |
690 | ||
691 | static struct attribute *bch_cache_set_files[] = { | |
692 | &sysfs_unregister, | |
693 | &sysfs_stop, | |
694 | &sysfs_synchronous, | |
695 | &sysfs_journal_delay_ms, | |
696 | &sysfs_flash_vol_create, | |
697 | ||
698 | &sysfs_bucket_size, | |
699 | &sysfs_block_size, | |
700 | &sysfs_tree_depth, | |
701 | &sysfs_root_usage_percent, | |
702 | &sysfs_btree_cache_size, | |
703 | &sysfs_cache_available_percent, | |
704 | ||
705 | &sysfs_average_key_size, | |
cafe5635 | 706 | |
77c320eb | 707 | &sysfs_errors, |
cafe5635 KO |
708 | &sysfs_io_error_limit, |
709 | &sysfs_io_error_halflife, | |
710 | &sysfs_congested, | |
711 | &sysfs_congested_read_threshold_us, | |
712 | &sysfs_congested_write_threshold_us, | |
713 | &sysfs_clear_stats, | |
714 | NULL | |
715 | }; | |
716 | KTYPE(bch_cache_set); | |
717 | ||
718 | static struct attribute *bch_cache_set_internal_files[] = { | |
719 | &sysfs_active_journal_entries, | |
720 | ||
721 | sysfs_time_stats_attribute_list(btree_gc, sec, ms) | |
722 | sysfs_time_stats_attribute_list(btree_split, sec, us) | |
723 | sysfs_time_stats_attribute_list(btree_sort, ms, us) | |
724 | sysfs_time_stats_attribute_list(btree_read, ms, us) | |
cafe5635 KO |
725 | |
726 | &sysfs_btree_nodes, | |
727 | &sysfs_btree_used_percent, | |
728 | &sysfs_btree_cache_max_chain, | |
729 | ||
730 | &sysfs_bset_tree_stats, | |
731 | &sysfs_cache_read_races, | |
732 | &sysfs_writeback_keys_done, | |
733 | &sysfs_writeback_keys_failed, | |
734 | ||
735 | &sysfs_trigger_gc, | |
736 | &sysfs_prune_cache, | |
737 | #ifdef CONFIG_BCACHE_DEBUG | |
738 | &sysfs_verify, | |
739 | &sysfs_key_merging_disabled, | |
280481d0 | 740 | &sysfs_expensive_debug_checks, |
cafe5635 KO |
741 | #endif |
742 | &sysfs_gc_always_rewrite, | |
743 | &sysfs_btree_shrinker_disabled, | |
744 | &sysfs_copy_gc_enabled, | |
745 | NULL | |
746 | }; | |
747 | KTYPE(bch_cache_set_internal); | |
748 | ||
749 | SHOW(__bch_cache) | |
750 | { | |
751 | struct cache *ca = container_of(kobj, struct cache, kobj); | |
752 | ||
753 | sysfs_hprint(bucket_size, bucket_bytes(ca)); | |
754 | sysfs_hprint(block_size, block_bytes(ca)); | |
755 | sysfs_print(nbuckets, ca->sb.nbuckets); | |
756 | sysfs_print(discard, ca->discard); | |
757 | sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); | |
758 | sysfs_hprint(btree_written, | |
759 | atomic_long_read(&ca->btree_sectors_written) << 9); | |
760 | sysfs_hprint(metadata_written, | |
761 | (atomic_long_read(&ca->meta_sectors_written) + | |
762 | atomic_long_read(&ca->btree_sectors_written)) << 9); | |
763 | ||
764 | sysfs_print(io_errors, | |
765 | atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); | |
766 | ||
cafe5635 | 767 | if (attr == &sysfs_cache_replacement_policy) |
169ef1cf KO |
768 | return bch_snprint_string_list(buf, PAGE_SIZE, |
769 | cache_replacement_policies, | |
770 | CACHE_REPLACEMENT(&ca->sb)); | |
cafe5635 KO |
771 | |
772 | if (attr == &sysfs_priority_stats) { | |
773 | int cmp(const void *l, const void *r) | |
774 | { return *((uint16_t *) r) - *((uint16_t *) l); } | |
775 | ||
15754020 KO |
776 | struct bucket *b; |
777 | size_t n = ca->sb.nbuckets, i; | |
778 | size_t unused = 0, available = 0, dirty = 0, meta = 0; | |
cafe5635 | 779 | uint64_t sum = 0; |
bbc77aa7 KO |
780 | /* Compute 31 quantiles */ |
781 | uint16_t q[31], *p, *cached; | |
cafe5635 KO |
782 | ssize_t ret; |
783 | ||
784 | cached = p = vmalloc(ca->sb.nbuckets * sizeof(uint16_t)); | |
785 | if (!p) | |
786 | return -ENOMEM; | |
787 | ||
788 | mutex_lock(&ca->set->bucket_lock); | |
15754020 KO |
789 | for_each_bucket(b, ca) { |
790 | if (!GC_SECTORS_USED(b)) | |
791 | unused++; | |
792 | if (GC_MARK(b) == GC_MARK_RECLAIMABLE) | |
793 | available++; | |
794 | if (GC_MARK(b) == GC_MARK_DIRTY) | |
795 | dirty++; | |
796 | if (GC_MARK(b) == GC_MARK_METADATA) | |
797 | meta++; | |
798 | } | |
799 | ||
cafe5635 KO |
800 | for (i = ca->sb.first_bucket; i < n; i++) |
801 | p[i] = ca->buckets[i].prio; | |
802 | mutex_unlock(&ca->set->bucket_lock); | |
803 | ||
804 | sort(p, n, sizeof(uint16_t), cmp, NULL); | |
805 | ||
806 | while (n && | |
807 | !cached[n - 1]) | |
808 | --n; | |
809 | ||
810 | unused = ca->sb.nbuckets - n; | |
811 | ||
812 | while (cached < p + n && | |
813 | *cached == BTREE_PRIO) | |
15754020 | 814 | cached++, n--; |
cafe5635 KO |
815 | |
816 | for (i = 0; i < n; i++) | |
817 | sum += INITIAL_PRIO - cached[i]; | |
818 | ||
819 | if (n) | |
820 | do_div(sum, n); | |
821 | ||
bbc77aa7 KO |
822 | for (i = 0; i < ARRAY_SIZE(q); i++) |
823 | q[i] = INITIAL_PRIO - cached[n * (i + 1) / | |
824 | (ARRAY_SIZE(q) + 1)]; | |
cafe5635 KO |
825 | |
826 | vfree(p); | |
827 | ||
bbc77aa7 KO |
828 | ret = scnprintf(buf, PAGE_SIZE, |
829 | "Unused: %zu%%\n" | |
15754020 KO |
830 | "Clean: %zu%%\n" |
831 | "Dirty: %zu%%\n" | |
bbc77aa7 KO |
832 | "Metadata: %zu%%\n" |
833 | "Average: %llu\n" | |
834 | "Sectors per Q: %zu\n" | |
835 | "Quantiles: [", | |
836 | unused * 100 / (size_t) ca->sb.nbuckets, | |
15754020 KO |
837 | available * 100 / (size_t) ca->sb.nbuckets, |
838 | dirty * 100 / (size_t) ca->sb.nbuckets, | |
839 | meta * 100 / (size_t) ca->sb.nbuckets, sum, | |
bbc77aa7 KO |
840 | n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1)); |
841 | ||
842 | for (i = 0; i < ARRAY_SIZE(q); i++) | |
843 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, | |
844 | "%u ", q[i]); | |
845 | ret--; | |
846 | ||
847 | ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); | |
848 | ||
cafe5635 KO |
849 | return ret; |
850 | } | |
851 | ||
852 | return 0; | |
853 | } | |
854 | SHOW_LOCKED(bch_cache) | |
855 | ||
856 | STORE(__bch_cache) | |
857 | { | |
858 | struct cache *ca = container_of(kobj, struct cache, kobj); | |
859 | ||
860 | if (attr == &sysfs_discard) { | |
861 | bool v = strtoul_or_return(buf); | |
862 | ||
863 | if (blk_queue_discard(bdev_get_queue(ca->bdev))) | |
864 | ca->discard = v; | |
865 | ||
866 | if (v != CACHE_DISCARD(&ca->sb)) { | |
867 | SET_CACHE_DISCARD(&ca->sb, v); | |
868 | bcache_write_super(ca->set); | |
869 | } | |
870 | } | |
871 | ||
872 | if (attr == &sysfs_cache_replacement_policy) { | |
169ef1cf | 873 | ssize_t v = bch_read_string_list(buf, cache_replacement_policies); |
cafe5635 KO |
874 | |
875 | if (v < 0) | |
876 | return v; | |
877 | ||
878 | if ((unsigned) v != CACHE_REPLACEMENT(&ca->sb)) { | |
879 | mutex_lock(&ca->set->bucket_lock); | |
880 | SET_CACHE_REPLACEMENT(&ca->sb, v); | |
881 | mutex_unlock(&ca->set->bucket_lock); | |
882 | ||
883 | bcache_write_super(ca->set); | |
884 | } | |
885 | } | |
886 | ||
cafe5635 KO |
887 | if (attr == &sysfs_clear_stats) { |
888 | atomic_long_set(&ca->sectors_written, 0); | |
889 | atomic_long_set(&ca->btree_sectors_written, 0); | |
890 | atomic_long_set(&ca->meta_sectors_written, 0); | |
891 | atomic_set(&ca->io_count, 0); | |
892 | atomic_set(&ca->io_errors, 0); | |
893 | } | |
894 | ||
895 | return size; | |
896 | } | |
897 | STORE_LOCKED(bch_cache) | |
898 | ||
899 | static struct attribute *bch_cache_files[] = { | |
900 | &sysfs_bucket_size, | |
901 | &sysfs_block_size, | |
902 | &sysfs_nbuckets, | |
903 | &sysfs_priority_stats, | |
904 | &sysfs_discard, | |
905 | &sysfs_written, | |
906 | &sysfs_btree_written, | |
907 | &sysfs_metadata_written, | |
908 | &sysfs_io_errors, | |
909 | &sysfs_clear_stats, | |
cafe5635 KO |
910 | &sysfs_cache_replacement_policy, |
911 | NULL | |
912 | }; | |
913 | KTYPE(bch_cache); |