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 /* Default is -1; we skip past it for struct cached_dev's cache mode */ 20 static const char * const bch_cache_modes[] = { 21 "writethrough", 22 "writeback", 23 "writearound", 24 "none", 25 NULL 26 }; 27 28 /* Default is -1; we skip past it for stop_when_cache_set_failed */ 29 static const char * const bch_stop_on_failure_modes[] = { 30 "auto", 31 "always", 32 NULL 33 }; 34 35 static const char * const cache_replacement_policies[] = { 36 "lru", 37 "fifo", 38 "random", 39 NULL 40 }; 41 42 static const char * const error_actions[] = { 43 "unregister", 44 "panic", 45 NULL 46 }; 47 48 write_attribute(attach); 49 write_attribute(detach); 50 write_attribute(unregister); 51 write_attribute(stop); 52 write_attribute(clear_stats); 53 write_attribute(trigger_gc); 54 write_attribute(prune_cache); 55 write_attribute(flash_vol_create); 56 57 read_attribute(bucket_size); 58 read_attribute(block_size); 59 read_attribute(nbuckets); 60 read_attribute(tree_depth); 61 read_attribute(root_usage_percent); 62 read_attribute(priority_stats); 63 read_attribute(btree_cache_size); 64 read_attribute(btree_cache_max_chain); 65 read_attribute(cache_available_percent); 66 read_attribute(written); 67 read_attribute(btree_written); 68 read_attribute(metadata_written); 69 read_attribute(active_journal_entries); 70 71 sysfs_time_stats_attribute(btree_gc, sec, ms); 72 sysfs_time_stats_attribute(btree_split, sec, us); 73 sysfs_time_stats_attribute(btree_sort, ms, us); 74 sysfs_time_stats_attribute(btree_read, ms, us); 75 76 read_attribute(btree_nodes); 77 read_attribute(btree_used_percent); 78 read_attribute(average_key_size); 79 read_attribute(dirty_data); 80 read_attribute(bset_tree_stats); 81 82 read_attribute(state); 83 read_attribute(cache_read_races); 84 read_attribute(reclaim); 85 read_attribute(flush_write); 86 read_attribute(retry_flush_write); 87 read_attribute(writeback_keys_done); 88 read_attribute(writeback_keys_failed); 89 read_attribute(io_errors); 90 read_attribute(congested); 91 rw_attribute(congested_read_threshold_us); 92 rw_attribute(congested_write_threshold_us); 93 94 rw_attribute(sequential_cutoff); 95 rw_attribute(data_csum); 96 rw_attribute(cache_mode); 97 rw_attribute(stop_when_cache_set_failed); 98 rw_attribute(writeback_metadata); 99 rw_attribute(writeback_running); 100 rw_attribute(writeback_percent); 101 rw_attribute(writeback_delay); 102 rw_attribute(writeback_rate); 103 104 rw_attribute(writeback_rate_update_seconds); 105 rw_attribute(writeback_rate_i_term_inverse); 106 rw_attribute(writeback_rate_p_term_inverse); 107 rw_attribute(writeback_rate_minimum); 108 read_attribute(writeback_rate_debug); 109 110 read_attribute(stripe_size); 111 read_attribute(partial_stripes_expensive); 112 113 rw_attribute(synchronous); 114 rw_attribute(journal_delay_ms); 115 rw_attribute(io_disable); 116 rw_attribute(discard); 117 rw_attribute(running); 118 rw_attribute(label); 119 rw_attribute(readahead); 120 rw_attribute(errors); 121 rw_attribute(io_error_limit); 122 rw_attribute(io_error_halflife); 123 rw_attribute(verify); 124 rw_attribute(bypass_torture_test); 125 rw_attribute(key_merging_disabled); 126 rw_attribute(gc_always_rewrite); 127 rw_attribute(expensive_debug_checks); 128 rw_attribute(cache_replacement_policy); 129 rw_attribute(btree_shrinker_disabled); 130 rw_attribute(copy_gc_enabled); 131 rw_attribute(size); 132 133 static ssize_t bch_snprint_string_list(char *buf, size_t size, const char * const list[], 134 size_t selected) 135 { 136 char *out = buf; 137 size_t i; 138 139 for (i = 0; list[i]; i++) 140 out += snprintf(out, buf + size - out, 141 i == selected ? "[%s] " : "%s ", list[i]); 142 143 out[-1] = '\n'; 144 return out - buf; 145 } 146 147 SHOW(__bch_cached_dev) 148 { 149 struct cached_dev *dc = container_of(kobj, struct cached_dev, 150 disk.kobj); 151 const char *states[] = { "no cache", "clean", "dirty", "inconsistent" }; 152 int wb = dc->writeback_running; 153 154 #define var(stat) (dc->stat) 155 156 if (attr == &sysfs_cache_mode) 157 return bch_snprint_string_list(buf, PAGE_SIZE, 158 bch_cache_modes, 159 BDEV_CACHE_MODE(&dc->sb)); 160 161 if (attr == &sysfs_stop_when_cache_set_failed) 162 return bch_snprint_string_list(buf, PAGE_SIZE, 163 bch_stop_on_failure_modes, 164 dc->stop_when_cache_set_failed); 165 166 167 sysfs_printf(data_csum, "%i", dc->disk.data_csum); 168 var_printf(verify, "%i"); 169 var_printf(bypass_torture_test, "%i"); 170 var_printf(writeback_metadata, "%i"); 171 var_printf(writeback_running, "%i"); 172 var_print(writeback_delay); 173 var_print(writeback_percent); 174 sysfs_hprint(writeback_rate, 175 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 : 0); 176 sysfs_hprint(io_errors, atomic_read(&dc->io_errors)); 177 sysfs_printf(io_error_limit, "%i", dc->error_limit); 178 sysfs_printf(io_disable, "%i", dc->io_disable); 179 var_print(writeback_rate_update_seconds); 180 var_print(writeback_rate_i_term_inverse); 181 var_print(writeback_rate_p_term_inverse); 182 var_print(writeback_rate_minimum); 183 184 if (attr == &sysfs_writeback_rate_debug) { 185 char rate[20]; 186 char dirty[20]; 187 char target[20]; 188 char proportional[20]; 189 char integral[20]; 190 char change[20]; 191 s64 next_io; 192 193 /* 194 * Except for dirty and target, other values should 195 * be 0 if writeback is not running. 196 */ 197 bch_hprint(rate, 198 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 199 : 0); 200 bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9); 201 bch_hprint(target, dc->writeback_rate_target << 9); 202 bch_hprint(proportional, 203 wb ? dc->writeback_rate_proportional << 9 : 0); 204 bch_hprint(integral, 205 wb ? dc->writeback_rate_integral_scaled << 9 : 0); 206 bch_hprint(change, wb ? dc->writeback_rate_change << 9 : 0); 207 next_io = wb ? div64_s64(dc->writeback_rate.next-local_clock(), 208 NSEC_PER_MSEC) : 0; 209 210 return sprintf(buf, 211 "rate:\t\t%s/sec\n" 212 "dirty:\t\t%s\n" 213 "target:\t\t%s\n" 214 "proportional:\t%s\n" 215 "integral:\t%s\n" 216 "change:\t\t%s/sec\n" 217 "next io:\t%llims\n", 218 rate, dirty, target, proportional, 219 integral, change, next_io); 220 } 221 222 sysfs_hprint(dirty_data, 223 bcache_dev_sectors_dirty(&dc->disk) << 9); 224 225 sysfs_hprint(stripe_size, ((uint64_t)dc->disk.stripe_size) << 9); 226 var_printf(partial_stripes_expensive, "%u"); 227 228 var_hprint(sequential_cutoff); 229 var_hprint(readahead); 230 231 sysfs_print(running, atomic_read(&dc->running)); 232 sysfs_print(state, states[BDEV_STATE(&dc->sb)]); 233 234 if (attr == &sysfs_label) { 235 memcpy(buf, dc->sb.label, SB_LABEL_SIZE); 236 buf[SB_LABEL_SIZE + 1] = '\0'; 237 strcat(buf, "\n"); 238 return strlen(buf); 239 } 240 241 #undef var 242 return 0; 243 } 244 SHOW_LOCKED(bch_cached_dev) 245 246 STORE(__cached_dev) 247 { 248 struct cached_dev *dc = container_of(kobj, struct cached_dev, 249 disk.kobj); 250 ssize_t v; 251 struct cache_set *c; 252 struct kobj_uevent_env *env; 253 254 #define d_strtoul(var) sysfs_strtoul(var, dc->var) 255 #define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX) 256 #define d_strtoi_h(var) sysfs_hatoi(var, dc->var) 257 258 sysfs_strtoul(data_csum, dc->disk.data_csum); 259 d_strtoul(verify); 260 d_strtoul(bypass_torture_test); 261 d_strtoul(writeback_metadata); 262 d_strtoul(writeback_running); 263 d_strtoul(writeback_delay); 264 265 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40); 266 267 if (attr == &sysfs_writeback_rate) { 268 ssize_t ret; 269 long int v = atomic_long_read(&dc->writeback_rate.rate); 270 271 ret = strtoul_safe_clamp(buf, v, 1, INT_MAX); 272 273 if (!ret) { 274 atomic_long_set(&dc->writeback_rate.rate, v); 275 ret = size; 276 } 277 278 return ret; 279 } 280 281 sysfs_strtoul_clamp(writeback_rate_update_seconds, 282 dc->writeback_rate_update_seconds, 283 1, WRITEBACK_RATE_UPDATE_SECS_MAX); 284 d_strtoul(writeback_rate_i_term_inverse); 285 d_strtoul_nonzero(writeback_rate_p_term_inverse); 286 287 sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX); 288 289 if (attr == &sysfs_io_disable) { 290 int v = strtoul_or_return(buf); 291 292 dc->io_disable = v ? 1 : 0; 293 } 294 295 d_strtoi_h(sequential_cutoff); 296 d_strtoi_h(readahead); 297 298 if (attr == &sysfs_clear_stats) 299 bch_cache_accounting_clear(&dc->accounting); 300 301 if (attr == &sysfs_running && 302 strtoul_or_return(buf)) 303 bch_cached_dev_run(dc); 304 305 if (attr == &sysfs_cache_mode) { 306 v = __sysfs_match_string(bch_cache_modes, -1, buf); 307 if (v < 0) 308 return v; 309 310 if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) { 311 SET_BDEV_CACHE_MODE(&dc->sb, v); 312 bch_write_bdev_super(dc, NULL); 313 } 314 } 315 316 if (attr == &sysfs_stop_when_cache_set_failed) { 317 v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf); 318 if (v < 0) 319 return v; 320 321 dc->stop_when_cache_set_failed = v; 322 } 323 324 if (attr == &sysfs_label) { 325 if (size > SB_LABEL_SIZE) 326 return -EINVAL; 327 memcpy(dc->sb.label, buf, size); 328 if (size < SB_LABEL_SIZE) 329 dc->sb.label[size] = '\0'; 330 if (size && dc->sb.label[size - 1] == '\n') 331 dc->sb.label[size - 1] = '\0'; 332 bch_write_bdev_super(dc, NULL); 333 if (dc->disk.c) { 334 memcpy(dc->disk.c->uuids[dc->disk.id].label, 335 buf, SB_LABEL_SIZE); 336 bch_uuid_write(dc->disk.c); 337 } 338 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); 339 if (!env) 340 return -ENOMEM; 341 add_uevent_var(env, "DRIVER=bcache"); 342 add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid), 343 add_uevent_var(env, "CACHED_LABEL=%s", buf); 344 kobject_uevent_env( 345 &disk_to_dev(dc->disk.disk)->kobj, KOBJ_CHANGE, env->envp); 346 kfree(env); 347 } 348 349 if (attr == &sysfs_attach) { 350 uint8_t set_uuid[16]; 351 352 if (bch_parse_uuid(buf, set_uuid) < 16) 353 return -EINVAL; 354 355 v = -ENOENT; 356 list_for_each_entry(c, &bch_cache_sets, list) { 357 v = bch_cached_dev_attach(dc, c, set_uuid); 358 if (!v) 359 return size; 360 } 361 if (v == -ENOENT) 362 pr_err("Can't attach %s: cache set not found", buf); 363 return v; 364 } 365 366 if (attr == &sysfs_detach && dc->disk.c) 367 bch_cached_dev_detach(dc); 368 369 if (attr == &sysfs_stop) 370 bcache_device_stop(&dc->disk); 371 372 return size; 373 } 374 375 STORE(bch_cached_dev) 376 { 377 struct cached_dev *dc = container_of(kobj, struct cached_dev, 378 disk.kobj); 379 380 mutex_lock(&bch_register_lock); 381 size = __cached_dev_store(kobj, attr, buf, size); 382 383 if (attr == &sysfs_writeback_running) 384 bch_writeback_queue(dc); 385 386 if (attr == &sysfs_writeback_percent) 387 if (!test_and_set_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags)) 388 schedule_delayed_work(&dc->writeback_rate_update, 389 dc->writeback_rate_update_seconds * HZ); 390 391 mutex_unlock(&bch_register_lock); 392 return size; 393 } 394 395 static struct attribute *bch_cached_dev_files[] = { 396 &sysfs_attach, 397 &sysfs_detach, 398 &sysfs_stop, 399 #if 0 400 &sysfs_data_csum, 401 #endif 402 &sysfs_cache_mode, 403 &sysfs_stop_when_cache_set_failed, 404 &sysfs_writeback_metadata, 405 &sysfs_writeback_running, 406 &sysfs_writeback_delay, 407 &sysfs_writeback_percent, 408 &sysfs_writeback_rate, 409 &sysfs_writeback_rate_update_seconds, 410 &sysfs_writeback_rate_i_term_inverse, 411 &sysfs_writeback_rate_p_term_inverse, 412 &sysfs_writeback_rate_debug, 413 &sysfs_errors, 414 &sysfs_io_error_limit, 415 &sysfs_io_disable, 416 &sysfs_dirty_data, 417 &sysfs_stripe_size, 418 &sysfs_partial_stripes_expensive, 419 &sysfs_sequential_cutoff, 420 &sysfs_clear_stats, 421 &sysfs_running, 422 &sysfs_state, 423 &sysfs_label, 424 &sysfs_readahead, 425 #ifdef CONFIG_BCACHE_DEBUG 426 &sysfs_verify, 427 &sysfs_bypass_torture_test, 428 #endif 429 NULL 430 }; 431 KTYPE(bch_cached_dev); 432 433 SHOW(bch_flash_dev) 434 { 435 struct bcache_device *d = container_of(kobj, struct bcache_device, 436 kobj); 437 struct uuid_entry *u = &d->c->uuids[d->id]; 438 439 sysfs_printf(data_csum, "%i", d->data_csum); 440 sysfs_hprint(size, u->sectors << 9); 441 442 if (attr == &sysfs_label) { 443 memcpy(buf, u->label, SB_LABEL_SIZE); 444 buf[SB_LABEL_SIZE + 1] = '\0'; 445 strcat(buf, "\n"); 446 return strlen(buf); 447 } 448 449 return 0; 450 } 451 452 STORE(__bch_flash_dev) 453 { 454 struct bcache_device *d = container_of(kobj, struct bcache_device, 455 kobj); 456 struct uuid_entry *u = &d->c->uuids[d->id]; 457 458 sysfs_strtoul(data_csum, d->data_csum); 459 460 if (attr == &sysfs_size) { 461 uint64_t v; 462 463 strtoi_h_or_return(buf, v); 464 465 u->sectors = v >> 9; 466 bch_uuid_write(d->c); 467 set_capacity(d->disk, u->sectors); 468 } 469 470 if (attr == &sysfs_label) { 471 memcpy(u->label, buf, SB_LABEL_SIZE); 472 bch_uuid_write(d->c); 473 } 474 475 if (attr == &sysfs_unregister) { 476 set_bit(BCACHE_DEV_DETACHING, &d->flags); 477 bcache_device_stop(d); 478 } 479 480 return size; 481 } 482 STORE_LOCKED(bch_flash_dev) 483 484 static struct attribute *bch_flash_dev_files[] = { 485 &sysfs_unregister, 486 #if 0 487 &sysfs_data_csum, 488 #endif 489 &sysfs_label, 490 &sysfs_size, 491 NULL 492 }; 493 KTYPE(bch_flash_dev); 494 495 struct bset_stats_op { 496 struct btree_op op; 497 size_t nodes; 498 struct bset_stats stats; 499 }; 500 501 static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b) 502 { 503 struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op); 504 505 op->nodes++; 506 bch_btree_keys_stats(&b->keys, &op->stats); 507 508 return MAP_CONTINUE; 509 } 510 511 static int bch_bset_print_stats(struct cache_set *c, char *buf) 512 { 513 struct bset_stats_op op; 514 int ret; 515 516 memset(&op, 0, sizeof(op)); 517 bch_btree_op_init(&op.op, -1); 518 519 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats); 520 if (ret < 0) 521 return ret; 522 523 return snprintf(buf, PAGE_SIZE, 524 "btree nodes: %zu\n" 525 "written sets: %zu\n" 526 "unwritten sets: %zu\n" 527 "written key bytes: %zu\n" 528 "unwritten key bytes: %zu\n" 529 "floats: %zu\n" 530 "failed: %zu\n", 531 op.nodes, 532 op.stats.sets_written, op.stats.sets_unwritten, 533 op.stats.bytes_written, op.stats.bytes_unwritten, 534 op.stats.floats, op.stats.failed); 535 } 536 537 static unsigned int bch_root_usage(struct cache_set *c) 538 { 539 unsigned int bytes = 0; 540 struct bkey *k; 541 struct btree *b; 542 struct btree_iter iter; 543 544 goto lock_root; 545 546 do { 547 rw_unlock(false, b); 548 lock_root: 549 b = c->root; 550 rw_lock(false, b, b->level); 551 } while (b != c->root); 552 553 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) 554 bytes += bkey_bytes(k); 555 556 rw_unlock(false, b); 557 558 return (bytes * 100) / btree_bytes(c); 559 } 560 561 static size_t bch_cache_size(struct cache_set *c) 562 { 563 size_t ret = 0; 564 struct btree *b; 565 566 mutex_lock(&c->bucket_lock); 567 list_for_each_entry(b, &c->btree_cache, list) 568 ret += 1 << (b->keys.page_order + PAGE_SHIFT); 569 570 mutex_unlock(&c->bucket_lock); 571 return ret; 572 } 573 574 static unsigned int bch_cache_max_chain(struct cache_set *c) 575 { 576 unsigned int ret = 0; 577 struct hlist_head *h; 578 579 mutex_lock(&c->bucket_lock); 580 581 for (h = c->bucket_hash; 582 h < c->bucket_hash + (1 << BUCKET_HASH_BITS); 583 h++) { 584 unsigned int i = 0; 585 struct hlist_node *p; 586 587 hlist_for_each(p, h) 588 i++; 589 590 ret = max(ret, i); 591 } 592 593 mutex_unlock(&c->bucket_lock); 594 return ret; 595 } 596 597 static unsigned int bch_btree_used(struct cache_set *c) 598 { 599 return div64_u64(c->gc_stats.key_bytes * 100, 600 (c->gc_stats.nodes ?: 1) * btree_bytes(c)); 601 } 602 603 static unsigned int bch_average_key_size(struct cache_set *c) 604 { 605 return c->gc_stats.nkeys 606 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) 607 : 0; 608 } 609 610 SHOW(__bch_cache_set) 611 { 612 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 613 614 sysfs_print(synchronous, CACHE_SYNC(&c->sb)); 615 sysfs_print(journal_delay_ms, c->journal_delay_ms); 616 sysfs_hprint(bucket_size, bucket_bytes(c)); 617 sysfs_hprint(block_size, block_bytes(c)); 618 sysfs_print(tree_depth, c->root->level); 619 sysfs_print(root_usage_percent, bch_root_usage(c)); 620 621 sysfs_hprint(btree_cache_size, bch_cache_size(c)); 622 sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c)); 623 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use); 624 625 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms); 626 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us); 627 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us); 628 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); 629 630 sysfs_print(btree_used_percent, bch_btree_used(c)); 631 sysfs_print(btree_nodes, c->gc_stats.nodes); 632 sysfs_hprint(average_key_size, bch_average_key_size(c)); 633 634 sysfs_print(cache_read_races, 635 atomic_long_read(&c->cache_read_races)); 636 637 sysfs_print(reclaim, 638 atomic_long_read(&c->reclaim)); 639 640 sysfs_print(flush_write, 641 atomic_long_read(&c->flush_write)); 642 643 sysfs_print(retry_flush_write, 644 atomic_long_read(&c->retry_flush_write)); 645 646 sysfs_print(writeback_keys_done, 647 atomic_long_read(&c->writeback_keys_done)); 648 sysfs_print(writeback_keys_failed, 649 atomic_long_read(&c->writeback_keys_failed)); 650 651 if (attr == &sysfs_errors) 652 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, 653 c->on_error); 654 655 /* See count_io_errors for why 88 */ 656 sysfs_print(io_error_halflife, c->error_decay * 88); 657 sysfs_print(io_error_limit, c->error_limit); 658 659 sysfs_hprint(congested, 660 ((uint64_t) bch_get_congested(c)) << 9); 661 sysfs_print(congested_read_threshold_us, 662 c->congested_read_threshold_us); 663 sysfs_print(congested_write_threshold_us, 664 c->congested_write_threshold_us); 665 666 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); 667 sysfs_printf(verify, "%i", c->verify); 668 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); 669 sysfs_printf(expensive_debug_checks, 670 "%i", c->expensive_debug_checks); 671 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); 672 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); 673 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); 674 sysfs_printf(io_disable, "%i", 675 test_bit(CACHE_SET_IO_DISABLE, &c->flags)); 676 677 if (attr == &sysfs_bset_tree_stats) 678 return bch_bset_print_stats(c, buf); 679 680 return 0; 681 } 682 SHOW_LOCKED(bch_cache_set) 683 684 STORE(__bch_cache_set) 685 { 686 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 687 ssize_t v; 688 689 if (attr == &sysfs_unregister) 690 bch_cache_set_unregister(c); 691 692 if (attr == &sysfs_stop) 693 bch_cache_set_stop(c); 694 695 if (attr == &sysfs_synchronous) { 696 bool sync = strtoul_or_return(buf); 697 698 if (sync != CACHE_SYNC(&c->sb)) { 699 SET_CACHE_SYNC(&c->sb, sync); 700 bcache_write_super(c); 701 } 702 } 703 704 if (attr == &sysfs_flash_vol_create) { 705 int r; 706 uint64_t v; 707 708 strtoi_h_or_return(buf, v); 709 710 r = bch_flash_dev_create(c, v); 711 if (r) 712 return r; 713 } 714 715 if (attr == &sysfs_clear_stats) { 716 atomic_long_set(&c->writeback_keys_done, 0); 717 atomic_long_set(&c->writeback_keys_failed, 0); 718 719 memset(&c->gc_stats, 0, sizeof(struct gc_stat)); 720 bch_cache_accounting_clear(&c->accounting); 721 } 722 723 if (attr == &sysfs_trigger_gc) { 724 /* 725 * Garbage collection thread only works when sectors_to_gc < 0, 726 * when users write to sysfs entry trigger_gc, most of time 727 * they want to forcibly triger gargage collection. Here -1 is 728 * set to c->sectors_to_gc, to make gc_should_run() give a 729 * chance to permit gc thread to run. "give a chance" means 730 * before going into gc_should_run(), there is still chance 731 * that c->sectors_to_gc being set to other positive value. So 732 * writing sysfs entry trigger_gc won't always make sure gc 733 * thread takes effect. 734 */ 735 atomic_set(&c->sectors_to_gc, -1); 736 wake_up_gc(c); 737 } 738 739 if (attr == &sysfs_prune_cache) { 740 struct shrink_control sc; 741 742 sc.gfp_mask = GFP_KERNEL; 743 sc.nr_to_scan = strtoul_or_return(buf); 744 c->shrink.scan_objects(&c->shrink, &sc); 745 } 746 747 sysfs_strtoul(congested_read_threshold_us, 748 c->congested_read_threshold_us); 749 sysfs_strtoul(congested_write_threshold_us, 750 c->congested_write_threshold_us); 751 752 if (attr == &sysfs_errors) { 753 v = __sysfs_match_string(error_actions, -1, buf); 754 if (v < 0) 755 return v; 756 757 c->on_error = v; 758 } 759 760 if (attr == &sysfs_io_error_limit) 761 c->error_limit = strtoul_or_return(buf); 762 763 /* See count_io_errors() for why 88 */ 764 if (attr == &sysfs_io_error_halflife) 765 c->error_decay = strtoul_or_return(buf) / 88; 766 767 if (attr == &sysfs_io_disable) { 768 v = strtoul_or_return(buf); 769 if (v) { 770 if (test_and_set_bit(CACHE_SET_IO_DISABLE, 771 &c->flags)) 772 pr_warn("CACHE_SET_IO_DISABLE already set"); 773 } else { 774 if (!test_and_clear_bit(CACHE_SET_IO_DISABLE, 775 &c->flags)) 776 pr_warn("CACHE_SET_IO_DISABLE already cleared"); 777 } 778 } 779 780 sysfs_strtoul(journal_delay_ms, c->journal_delay_ms); 781 sysfs_strtoul(verify, c->verify); 782 sysfs_strtoul(key_merging_disabled, c->key_merging_disabled); 783 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); 784 sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite); 785 sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled); 786 sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled); 787 788 return size; 789 } 790 STORE_LOCKED(bch_cache_set) 791 792 SHOW(bch_cache_set_internal) 793 { 794 struct cache_set *c = container_of(kobj, struct cache_set, internal); 795 796 return bch_cache_set_show(&c->kobj, attr, buf); 797 } 798 799 STORE(bch_cache_set_internal) 800 { 801 struct cache_set *c = container_of(kobj, struct cache_set, internal); 802 803 return bch_cache_set_store(&c->kobj, attr, buf, size); 804 } 805 806 static void bch_cache_set_internal_release(struct kobject *k) 807 { 808 } 809 810 static struct attribute *bch_cache_set_files[] = { 811 &sysfs_unregister, 812 &sysfs_stop, 813 &sysfs_synchronous, 814 &sysfs_journal_delay_ms, 815 &sysfs_flash_vol_create, 816 817 &sysfs_bucket_size, 818 &sysfs_block_size, 819 &sysfs_tree_depth, 820 &sysfs_root_usage_percent, 821 &sysfs_btree_cache_size, 822 &sysfs_cache_available_percent, 823 824 &sysfs_average_key_size, 825 826 &sysfs_errors, 827 &sysfs_io_error_limit, 828 &sysfs_io_error_halflife, 829 &sysfs_congested, 830 &sysfs_congested_read_threshold_us, 831 &sysfs_congested_write_threshold_us, 832 &sysfs_clear_stats, 833 NULL 834 }; 835 KTYPE(bch_cache_set); 836 837 static struct attribute *bch_cache_set_internal_files[] = { 838 &sysfs_active_journal_entries, 839 840 sysfs_time_stats_attribute_list(btree_gc, sec, ms) 841 sysfs_time_stats_attribute_list(btree_split, sec, us) 842 sysfs_time_stats_attribute_list(btree_sort, ms, us) 843 sysfs_time_stats_attribute_list(btree_read, ms, us) 844 845 &sysfs_btree_nodes, 846 &sysfs_btree_used_percent, 847 &sysfs_btree_cache_max_chain, 848 849 &sysfs_bset_tree_stats, 850 &sysfs_cache_read_races, 851 &sysfs_reclaim, 852 &sysfs_flush_write, 853 &sysfs_retry_flush_write, 854 &sysfs_writeback_keys_done, 855 &sysfs_writeback_keys_failed, 856 857 &sysfs_trigger_gc, 858 &sysfs_prune_cache, 859 #ifdef CONFIG_BCACHE_DEBUG 860 &sysfs_verify, 861 &sysfs_key_merging_disabled, 862 &sysfs_expensive_debug_checks, 863 #endif 864 &sysfs_gc_always_rewrite, 865 &sysfs_btree_shrinker_disabled, 866 &sysfs_copy_gc_enabled, 867 &sysfs_io_disable, 868 NULL 869 }; 870 KTYPE(bch_cache_set_internal); 871 872 static int __bch_cache_cmp(const void *l, const void *r) 873 { 874 return *((uint16_t *)r) - *((uint16_t *)l); 875 } 876 877 SHOW(__bch_cache) 878 { 879 struct cache *ca = container_of(kobj, struct cache, kobj); 880 881 sysfs_hprint(bucket_size, bucket_bytes(ca)); 882 sysfs_hprint(block_size, block_bytes(ca)); 883 sysfs_print(nbuckets, ca->sb.nbuckets); 884 sysfs_print(discard, ca->discard); 885 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); 886 sysfs_hprint(btree_written, 887 atomic_long_read(&ca->btree_sectors_written) << 9); 888 sysfs_hprint(metadata_written, 889 (atomic_long_read(&ca->meta_sectors_written) + 890 atomic_long_read(&ca->btree_sectors_written)) << 9); 891 892 sysfs_print(io_errors, 893 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); 894 895 if (attr == &sysfs_cache_replacement_policy) 896 return bch_snprint_string_list(buf, PAGE_SIZE, 897 cache_replacement_policies, 898 CACHE_REPLACEMENT(&ca->sb)); 899 900 if (attr == &sysfs_priority_stats) { 901 struct bucket *b; 902 size_t n = ca->sb.nbuckets, i; 903 size_t unused = 0, available = 0, dirty = 0, meta = 0; 904 uint64_t sum = 0; 905 /* Compute 31 quantiles */ 906 uint16_t q[31], *p, *cached; 907 ssize_t ret; 908 909 cached = p = vmalloc(array_size(sizeof(uint16_t), 910 ca->sb.nbuckets)); 911 if (!p) 912 return -ENOMEM; 913 914 mutex_lock(&ca->set->bucket_lock); 915 for_each_bucket(b, ca) { 916 if (!GC_SECTORS_USED(b)) 917 unused++; 918 if (GC_MARK(b) == GC_MARK_RECLAIMABLE) 919 available++; 920 if (GC_MARK(b) == GC_MARK_DIRTY) 921 dirty++; 922 if (GC_MARK(b) == GC_MARK_METADATA) 923 meta++; 924 } 925 926 for (i = ca->sb.first_bucket; i < n; i++) 927 p[i] = ca->buckets[i].prio; 928 mutex_unlock(&ca->set->bucket_lock); 929 930 sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL); 931 932 while (n && 933 !cached[n - 1]) 934 --n; 935 936 unused = ca->sb.nbuckets - n; 937 938 while (cached < p + n && 939 *cached == BTREE_PRIO) 940 cached++, n--; 941 942 for (i = 0; i < n; i++) 943 sum += INITIAL_PRIO - cached[i]; 944 945 if (n) 946 do_div(sum, n); 947 948 for (i = 0; i < ARRAY_SIZE(q); i++) 949 q[i] = INITIAL_PRIO - cached[n * (i + 1) / 950 (ARRAY_SIZE(q) + 1)]; 951 952 vfree(p); 953 954 ret = scnprintf(buf, PAGE_SIZE, 955 "Unused: %zu%%\n" 956 "Clean: %zu%%\n" 957 "Dirty: %zu%%\n" 958 "Metadata: %zu%%\n" 959 "Average: %llu\n" 960 "Sectors per Q: %zu\n" 961 "Quantiles: [", 962 unused * 100 / (size_t) ca->sb.nbuckets, 963 available * 100 / (size_t) ca->sb.nbuckets, 964 dirty * 100 / (size_t) ca->sb.nbuckets, 965 meta * 100 / (size_t) ca->sb.nbuckets, sum, 966 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1)); 967 968 for (i = 0; i < ARRAY_SIZE(q); i++) 969 ret += scnprintf(buf + ret, PAGE_SIZE - ret, 970 "%u ", q[i]); 971 ret--; 972 973 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); 974 975 return ret; 976 } 977 978 return 0; 979 } 980 SHOW_LOCKED(bch_cache) 981 982 STORE(__bch_cache) 983 { 984 struct cache *ca = container_of(kobj, struct cache, kobj); 985 ssize_t v; 986 987 if (attr == &sysfs_discard) { 988 bool v = strtoul_or_return(buf); 989 990 if (blk_queue_discard(bdev_get_queue(ca->bdev))) 991 ca->discard = v; 992 993 if (v != CACHE_DISCARD(&ca->sb)) { 994 SET_CACHE_DISCARD(&ca->sb, v); 995 bcache_write_super(ca->set); 996 } 997 } 998 999 if (attr == &sysfs_cache_replacement_policy) { 1000 v = __sysfs_match_string(cache_replacement_policies, -1, buf); 1001 if (v < 0) 1002 return v; 1003 1004 if ((unsigned int) v != CACHE_REPLACEMENT(&ca->sb)) { 1005 mutex_lock(&ca->set->bucket_lock); 1006 SET_CACHE_REPLACEMENT(&ca->sb, v); 1007 mutex_unlock(&ca->set->bucket_lock); 1008 1009 bcache_write_super(ca->set); 1010 } 1011 } 1012 1013 if (attr == &sysfs_clear_stats) { 1014 atomic_long_set(&ca->sectors_written, 0); 1015 atomic_long_set(&ca->btree_sectors_written, 0); 1016 atomic_long_set(&ca->meta_sectors_written, 0); 1017 atomic_set(&ca->io_count, 0); 1018 atomic_set(&ca->io_errors, 0); 1019 } 1020 1021 return size; 1022 } 1023 STORE_LOCKED(bch_cache) 1024 1025 static struct attribute *bch_cache_files[] = { 1026 &sysfs_bucket_size, 1027 &sysfs_block_size, 1028 &sysfs_nbuckets, 1029 &sysfs_priority_stats, 1030 &sysfs_discard, 1031 &sysfs_written, 1032 &sysfs_btree_written, 1033 &sysfs_metadata_written, 1034 &sysfs_io_errors, 1035 &sysfs_clear_stats, 1036 &sysfs_cache_replacement_policy, 1037 NULL 1038 }; 1039 KTYPE(bch_cache); 1040