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 static const char * const cache_replacement_policies[] = { 20 "lru", 21 "fifo", 22 "random", 23 NULL 24 }; 25 26 static const char * const error_actions[] = { 27 "unregister", 28 "panic", 29 NULL 30 }; 31 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); 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); 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); 87 read_attribute(writeback_rate_debug); 88 89 read_attribute(stripe_size); 90 read_attribute(partial_stripes_expensive); 91 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); 98 rw_attribute(errors); 99 rw_attribute(io_error_limit); 100 rw_attribute(io_error_halflife); 101 rw_attribute(verify); 102 rw_attribute(bypass_torture_test); 103 rw_attribute(key_merging_disabled); 104 rw_attribute(gc_always_rewrite); 105 rw_attribute(expensive_debug_checks); 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) 120 return bch_snprint_string_list(buf, PAGE_SIZE, 121 bch_cache_modes + 1, 122 BDEV_CACHE_MODE(&dc->sb)); 123 124 sysfs_printf(data_csum, "%i", dc->disk.data_csum); 125 var_printf(verify, "%i"); 126 var_printf(bypass_torture_test, "%i"); 127 var_printf(writeback_metadata, "%i"); 128 var_printf(writeback_running, "%i"); 129 var_print(writeback_delay); 130 var_print(writeback_percent); 131 sysfs_hprint(writeback_rate, dc->writeback_rate.rate << 9); 132 133 var_print(writeback_rate_update_seconds); 134 var_print(writeback_rate_d_term); 135 var_print(writeback_rate_p_term_inverse); 136 137 if (attr == &sysfs_writeback_rate_debug) { 138 char rate[20]; 139 char dirty[20]; 140 char target[20]; 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); 148 bch_hprint(target, dc->writeback_rate_target << 9); 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); 155 156 return sprintf(buf, 157 "rate:\t\t%s/sec\n" 158 "dirty:\t\t%s\n" 159 "target:\t\t%s\n" 160 "proportional:\t%s\n" 161 "derivative:\t%s\n" 162 "change:\t\t%s/sec\n" 163 "next io:\t%llims\n", 164 rate, dirty, target, proportional, 165 derivative, change, next_io); 166 } 167 168 sysfs_hprint(dirty_data, 169 bcache_dev_sectors_dirty(&dc->disk) << 9); 170 171 sysfs_hprint(stripe_size, dc->disk.stripe_size << 9); 172 var_printf(partial_stripes_expensive, "%u"); 173 174 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); 196 ssize_t v = size; 197 struct cache_set *c; 198 struct kobj_uevent_env *env; 199 200 #define d_strtoul(var) sysfs_strtoul(var, dc->var) 201 #define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX) 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); 206 d_strtoul(bypass_torture_test); 207 d_strtoul(writeback_metadata); 208 d_strtoul(writeback_running); 209 d_strtoul(writeback_delay); 210 211 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40); 212 213 sysfs_strtoul_clamp(writeback_rate, 214 dc->writeback_rate.rate, 1, INT_MAX); 215 216 d_strtoul_nonzero(writeback_rate_update_seconds); 217 d_strtoul(writeback_rate_d_term); 218 d_strtoul_nonzero(writeback_rate_p_term_inverse); 219 220 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) { 231 v = bch_read_string_list(buf, bch_cache_modes + 1); 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) { 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'; 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 } 256 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); 257 if (!env) 258 return -ENOMEM; 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); 265 } 266 267 if (attr == &sysfs_attach) { 268 if (bch_parse_uuid(buf, dc->sb.set_uuid) < 16) 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, 325 &sysfs_writeback_rate_debug, 326 &sysfs_dirty_data, 327 &sysfs_stripe_size, 328 &sysfs_partial_stripes_expensive, 329 &sysfs_sequential_cutoff, 330 &sysfs_clear_stats, 331 &sysfs_running, 332 &sysfs_state, 333 &sysfs_label, 334 &sysfs_readahead, 335 #ifdef CONFIG_BCACHE_DEBUG 336 &sysfs_verify, 337 &sysfs_bypass_torture_test, 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) { 385 set_bit(BCACHE_DEV_DETACHING, &d->flags); 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); 403 404 struct bset_stats_op { 405 struct btree_op op; 406 size_t nodes; 407 struct bset_stats stats; 408 }; 409 410 static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b) 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 } 419 420 static int bch_bset_print_stats(struct cache_set *c, char *buf) 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); 427 428 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats); 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 } 445 446 static unsigned bch_root_usage(struct cache_set *c) 447 { 448 unsigned bytes = 0; 449 struct bkey *k; 450 struct btree *b; 451 struct btree_iter iter; 452 453 goto lock_root; 454 455 do { 456 rw_unlock(false, b); 457 lock_root: 458 b = c->root; 459 rw_lock(false, b, b->level); 460 } while (b != c->root); 461 462 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) 463 bytes += bkey_bytes(k); 464 465 rw_unlock(false, b); 466 467 return (bytes * 100) / btree_bytes(c); 468 } 469 470 static size_t bch_cache_size(struct cache_set *c) 471 { 472 size_t ret = 0; 473 struct btree *b; 474 475 mutex_lock(&c->bucket_lock); 476 list_for_each_entry(b, &c->btree_cache, list) 477 ret += 1 << (b->keys.page_order + PAGE_SHIFT); 478 479 mutex_unlock(&c->bucket_lock); 480 return ret; 481 } 482 483 static unsigned bch_cache_max_chain(struct cache_set *c) 484 { 485 unsigned ret = 0; 486 struct hlist_head *h; 487 488 mutex_lock(&c->bucket_lock); 489 490 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; 495 496 hlist_for_each(p, h) 497 i++; 498 499 ret = max(ret, i); 500 } 501 502 mutex_unlock(&c->bucket_lock); 503 return ret; 504 } 505 506 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 } 511 512 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 { 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); 528 sysfs_print(root_usage_percent, bch_root_usage(c)); 529 530 sysfs_hprint(btree_cache_size, bch_cache_size(c)); 531 sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c)); 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); 536 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us); 537 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); 538 539 sysfs_print(btree_used_percent, bch_btree_used(c)); 540 sysfs_print(btree_nodes, c->gc_stats.nodes); 541 sysfs_hprint(average_key_size, bch_average_key_size(c)); 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)); 550 551 if (attr == &sysfs_errors) 552 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, 553 c->on_error); 554 555 /* 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); 569 sysfs_printf(expensive_debug_checks, 570 "%i", c->expensive_debug_checks); 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 } 618 619 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); 632 wake_up_gc(c); 633 } 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); 639 c->shrink.scan_objects(&c->shrink, &sc); 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); 646 647 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 } 655 656 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); 666 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); 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, 706 707 &sysfs_errors, 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) 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, 740 &sysfs_expensive_debug_checks, 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); 766 767 if (attr == &sysfs_cache_replacement_policy) 768 return bch_snprint_string_list(buf, PAGE_SIZE, 769 cache_replacement_policies, 770 CACHE_REPLACEMENT(&ca->sb)); 771 772 if (attr == &sysfs_priority_stats) { 773 int cmp(const void *l, const void *r) 774 { return *((uint16_t *) r) - *((uint16_t *) l); } 775 776 struct bucket *b; 777 size_t n = ca->sb.nbuckets, i; 778 size_t unused = 0, available = 0, dirty = 0, meta = 0; 779 uint64_t sum = 0; 780 /* Compute 31 quantiles */ 781 uint16_t q[31], *p, *cached; 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); 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 } 799 800 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) 814 cached++, n--; 815 816 for (i = 0; i < n; i++) 817 sum += INITIAL_PRIO - cached[i]; 818 819 if (n) 820 do_div(sum, n); 821 822 for (i = 0; i < ARRAY_SIZE(q); i++) 823 q[i] = INITIAL_PRIO - cached[n * (i + 1) / 824 (ARRAY_SIZE(q) + 1)]; 825 826 vfree(p); 827 828 ret = scnprintf(buf, PAGE_SIZE, 829 "Unused: %zu%%\n" 830 "Clean: %zu%%\n" 831 "Dirty: %zu%%\n" 832 "Metadata: %zu%%\n" 833 "Average: %llu\n" 834 "Sectors per Q: %zu\n" 835 "Quantiles: [", 836 unused * 100 / (size_t) ca->sb.nbuckets, 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, 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"); 848 849 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) { 873 ssize_t v = bch_read_string_list(buf, cache_replacement_policies); 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 } 886 887 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, 910 &sysfs_cache_replacement_policy, 911 NULL 912 }; 913 KTYPE(bch_cache); 914