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