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 0 ("writethrough") */ 20 static const char * const bch_cache_modes[] = { 21 "writethrough", 22 "writeback", 23 "writearound", 24 "none", 25 NULL 26 }; 27 28 /* Default is 0 ("auto") */ 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 read_attribute(cutoff_writeback); 92 read_attribute(cutoff_writeback_sync); 93 rw_attribute(congested_read_threshold_us); 94 rw_attribute(congested_write_threshold_us); 95 96 rw_attribute(sequential_cutoff); 97 rw_attribute(data_csum); 98 rw_attribute(cache_mode); 99 rw_attribute(stop_when_cache_set_failed); 100 rw_attribute(writeback_metadata); 101 rw_attribute(writeback_running); 102 rw_attribute(writeback_percent); 103 rw_attribute(writeback_delay); 104 rw_attribute(writeback_rate); 105 106 rw_attribute(writeback_rate_update_seconds); 107 rw_attribute(writeback_rate_i_term_inverse); 108 rw_attribute(writeback_rate_p_term_inverse); 109 rw_attribute(writeback_rate_minimum); 110 read_attribute(writeback_rate_debug); 111 112 read_attribute(stripe_size); 113 read_attribute(partial_stripes_expensive); 114 115 rw_attribute(synchronous); 116 rw_attribute(journal_delay_ms); 117 rw_attribute(io_disable); 118 rw_attribute(discard); 119 rw_attribute(running); 120 rw_attribute(label); 121 rw_attribute(readahead); 122 rw_attribute(errors); 123 rw_attribute(io_error_limit); 124 rw_attribute(io_error_halflife); 125 rw_attribute(verify); 126 rw_attribute(bypass_torture_test); 127 rw_attribute(key_merging_disabled); 128 rw_attribute(gc_always_rewrite); 129 rw_attribute(expensive_debug_checks); 130 rw_attribute(cache_replacement_policy); 131 rw_attribute(btree_shrinker_disabled); 132 rw_attribute(copy_gc_enabled); 133 rw_attribute(gc_after_writeback); 134 rw_attribute(size); 135 136 static ssize_t bch_snprint_string_list(char *buf, 137 size_t size, 138 const char * const list[], 139 size_t selected) 140 { 141 char *out = buf; 142 size_t i; 143 144 for (i = 0; list[i]; i++) 145 out += snprintf(out, buf + size - out, 146 i == selected ? "[%s] " : "%s ", list[i]); 147 148 out[-1] = '\n'; 149 return out - buf; 150 } 151 152 SHOW(__bch_cached_dev) 153 { 154 struct cached_dev *dc = container_of(kobj, struct cached_dev, 155 disk.kobj); 156 char const *states[] = { "no cache", "clean", "dirty", "inconsistent" }; 157 int wb = dc->writeback_running; 158 159 #define var(stat) (dc->stat) 160 161 if (attr == &sysfs_cache_mode) 162 return bch_snprint_string_list(buf, PAGE_SIZE, 163 bch_cache_modes, 164 BDEV_CACHE_MODE(&dc->sb)); 165 166 if (attr == &sysfs_stop_when_cache_set_failed) 167 return bch_snprint_string_list(buf, PAGE_SIZE, 168 bch_stop_on_failure_modes, 169 dc->stop_when_cache_set_failed); 170 171 172 sysfs_printf(data_csum, "%i", dc->disk.data_csum); 173 var_printf(verify, "%i"); 174 var_printf(bypass_torture_test, "%i"); 175 var_printf(writeback_metadata, "%i"); 176 var_printf(writeback_running, "%i"); 177 var_print(writeback_delay); 178 var_print(writeback_percent); 179 sysfs_hprint(writeback_rate, 180 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 : 0); 181 sysfs_hprint(io_errors, atomic_read(&dc->io_errors)); 182 sysfs_printf(io_error_limit, "%i", dc->error_limit); 183 sysfs_printf(io_disable, "%i", dc->io_disable); 184 var_print(writeback_rate_update_seconds); 185 var_print(writeback_rate_i_term_inverse); 186 var_print(writeback_rate_p_term_inverse); 187 var_print(writeback_rate_minimum); 188 189 if (attr == &sysfs_writeback_rate_debug) { 190 char rate[20]; 191 char dirty[20]; 192 char target[20]; 193 char proportional[20]; 194 char integral[20]; 195 char change[20]; 196 s64 next_io; 197 198 /* 199 * Except for dirty and target, other values should 200 * be 0 if writeback is not running. 201 */ 202 bch_hprint(rate, 203 wb ? atomic_long_read(&dc->writeback_rate.rate) << 9 204 : 0); 205 bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9); 206 bch_hprint(target, dc->writeback_rate_target << 9); 207 bch_hprint(proportional, 208 wb ? dc->writeback_rate_proportional << 9 : 0); 209 bch_hprint(integral, 210 wb ? dc->writeback_rate_integral_scaled << 9 : 0); 211 bch_hprint(change, wb ? dc->writeback_rate_change << 9 : 0); 212 next_io = wb ? div64_s64(dc->writeback_rate.next-local_clock(), 213 NSEC_PER_MSEC) : 0; 214 215 return sprintf(buf, 216 "rate:\t\t%s/sec\n" 217 "dirty:\t\t%s\n" 218 "target:\t\t%s\n" 219 "proportional:\t%s\n" 220 "integral:\t%s\n" 221 "change:\t\t%s/sec\n" 222 "next io:\t%llims\n", 223 rate, dirty, target, proportional, 224 integral, change, next_io); 225 } 226 227 sysfs_hprint(dirty_data, 228 bcache_dev_sectors_dirty(&dc->disk) << 9); 229 230 sysfs_hprint(stripe_size, ((uint64_t)dc->disk.stripe_size) << 9); 231 var_printf(partial_stripes_expensive, "%u"); 232 233 var_hprint(sequential_cutoff); 234 var_hprint(readahead); 235 236 sysfs_print(running, atomic_read(&dc->running)); 237 sysfs_print(state, states[BDEV_STATE(&dc->sb)]); 238 239 if (attr == &sysfs_label) { 240 memcpy(buf, dc->sb.label, SB_LABEL_SIZE); 241 buf[SB_LABEL_SIZE + 1] = '\0'; 242 strcat(buf, "\n"); 243 return strlen(buf); 244 } 245 246 #undef var 247 return 0; 248 } 249 SHOW_LOCKED(bch_cached_dev) 250 251 STORE(__cached_dev) 252 { 253 struct cached_dev *dc = container_of(kobj, struct cached_dev, 254 disk.kobj); 255 ssize_t v; 256 struct cache_set *c; 257 struct kobj_uevent_env *env; 258 259 #define d_strtoul(var) sysfs_strtoul(var, dc->var) 260 #define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX) 261 #define d_strtoi_h(var) sysfs_hatoi(var, dc->var) 262 263 sysfs_strtoul(data_csum, dc->disk.data_csum); 264 d_strtoul(verify); 265 d_strtoul(bypass_torture_test); 266 d_strtoul(writeback_metadata); 267 d_strtoul(writeback_running); 268 d_strtoul(writeback_delay); 269 270 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 271 0, bch_cutoff_writeback); 272 273 if (attr == &sysfs_writeback_rate) { 274 ssize_t ret; 275 long int v = atomic_long_read(&dc->writeback_rate.rate); 276 277 ret = strtoul_safe_clamp(buf, v, 1, INT_MAX); 278 279 if (!ret) { 280 atomic_long_set(&dc->writeback_rate.rate, v); 281 ret = size; 282 } 283 284 return ret; 285 } 286 287 sysfs_strtoul_clamp(writeback_rate_update_seconds, 288 dc->writeback_rate_update_seconds, 289 1, WRITEBACK_RATE_UPDATE_SECS_MAX); 290 d_strtoul(writeback_rate_i_term_inverse); 291 d_strtoul_nonzero(writeback_rate_p_term_inverse); 292 d_strtoul_nonzero(writeback_rate_minimum); 293 294 sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX); 295 296 if (attr == &sysfs_io_disable) { 297 int v = strtoul_or_return(buf); 298 299 dc->io_disable = v ? 1 : 0; 300 } 301 302 d_strtoi_h(sequential_cutoff); 303 d_strtoi_h(readahead); 304 305 if (attr == &sysfs_clear_stats) 306 bch_cache_accounting_clear(&dc->accounting); 307 308 if (attr == &sysfs_running && 309 strtoul_or_return(buf)) 310 bch_cached_dev_run(dc); 311 312 if (attr == &sysfs_cache_mode) { 313 v = __sysfs_match_string(bch_cache_modes, -1, buf); 314 if (v < 0) 315 return v; 316 317 if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) { 318 SET_BDEV_CACHE_MODE(&dc->sb, v); 319 bch_write_bdev_super(dc, NULL); 320 } 321 } 322 323 if (attr == &sysfs_stop_when_cache_set_failed) { 324 v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf); 325 if (v < 0) 326 return v; 327 328 dc->stop_when_cache_set_failed = v; 329 } 330 331 if (attr == &sysfs_label) { 332 if (size > SB_LABEL_SIZE) 333 return -EINVAL; 334 memcpy(dc->sb.label, buf, size); 335 if (size < SB_LABEL_SIZE) 336 dc->sb.label[size] = '\0'; 337 if (size && dc->sb.label[size - 1] == '\n') 338 dc->sb.label[size - 1] = '\0'; 339 bch_write_bdev_super(dc, NULL); 340 if (dc->disk.c) { 341 memcpy(dc->disk.c->uuids[dc->disk.id].label, 342 buf, SB_LABEL_SIZE); 343 bch_uuid_write(dc->disk.c); 344 } 345 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); 346 if (!env) 347 return -ENOMEM; 348 add_uevent_var(env, "DRIVER=bcache"); 349 add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid), 350 add_uevent_var(env, "CACHED_LABEL=%s", buf); 351 kobject_uevent_env(&disk_to_dev(dc->disk.disk)->kobj, 352 KOBJ_CHANGE, 353 env->envp); 354 kfree(env); 355 } 356 357 if (attr == &sysfs_attach) { 358 uint8_t set_uuid[16]; 359 360 if (bch_parse_uuid(buf, set_uuid) < 16) 361 return -EINVAL; 362 363 v = -ENOENT; 364 list_for_each_entry(c, &bch_cache_sets, list) { 365 v = bch_cached_dev_attach(dc, c, set_uuid); 366 if (!v) 367 return size; 368 } 369 if (v == -ENOENT) 370 pr_err("Can't attach %s: cache set not found", buf); 371 return v; 372 } 373 374 if (attr == &sysfs_detach && dc->disk.c) 375 bch_cached_dev_detach(dc); 376 377 if (attr == &sysfs_stop) 378 bcache_device_stop(&dc->disk); 379 380 return size; 381 } 382 383 STORE(bch_cached_dev) 384 { 385 struct cached_dev *dc = container_of(kobj, struct cached_dev, 386 disk.kobj); 387 388 mutex_lock(&bch_register_lock); 389 size = __cached_dev_store(kobj, attr, buf, size); 390 391 if (attr == &sysfs_writeback_running) { 392 /* dc->writeback_running changed in __cached_dev_store() */ 393 if (IS_ERR_OR_NULL(dc->writeback_thread)) { 394 /* 395 * reject setting it to 1 via sysfs if writeback 396 * kthread is not created yet. 397 */ 398 if (dc->writeback_running) { 399 dc->writeback_running = false; 400 pr_err("%s: failed to run non-existent writeback thread", 401 dc->disk.disk->disk_name); 402 } 403 } else 404 /* 405 * writeback kthread will check if dc->writeback_running 406 * is true or false. 407 */ 408 bch_writeback_queue(dc); 409 } 410 411 if (attr == &sysfs_writeback_percent) 412 if (!test_and_set_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags)) 413 schedule_delayed_work(&dc->writeback_rate_update, 414 dc->writeback_rate_update_seconds * HZ); 415 416 mutex_unlock(&bch_register_lock); 417 return size; 418 } 419 420 static struct attribute *bch_cached_dev_files[] = { 421 &sysfs_attach, 422 &sysfs_detach, 423 &sysfs_stop, 424 #if 0 425 &sysfs_data_csum, 426 #endif 427 &sysfs_cache_mode, 428 &sysfs_stop_when_cache_set_failed, 429 &sysfs_writeback_metadata, 430 &sysfs_writeback_running, 431 &sysfs_writeback_delay, 432 &sysfs_writeback_percent, 433 &sysfs_writeback_rate, 434 &sysfs_writeback_rate_update_seconds, 435 &sysfs_writeback_rate_i_term_inverse, 436 &sysfs_writeback_rate_p_term_inverse, 437 &sysfs_writeback_rate_minimum, 438 &sysfs_writeback_rate_debug, 439 &sysfs_errors, 440 &sysfs_io_error_limit, 441 &sysfs_io_disable, 442 &sysfs_dirty_data, 443 &sysfs_stripe_size, 444 &sysfs_partial_stripes_expensive, 445 &sysfs_sequential_cutoff, 446 &sysfs_clear_stats, 447 &sysfs_running, 448 &sysfs_state, 449 &sysfs_label, 450 &sysfs_readahead, 451 #ifdef CONFIG_BCACHE_DEBUG 452 &sysfs_verify, 453 &sysfs_bypass_torture_test, 454 #endif 455 NULL 456 }; 457 KTYPE(bch_cached_dev); 458 459 SHOW(bch_flash_dev) 460 { 461 struct bcache_device *d = container_of(kobj, struct bcache_device, 462 kobj); 463 struct uuid_entry *u = &d->c->uuids[d->id]; 464 465 sysfs_printf(data_csum, "%i", d->data_csum); 466 sysfs_hprint(size, u->sectors << 9); 467 468 if (attr == &sysfs_label) { 469 memcpy(buf, u->label, SB_LABEL_SIZE); 470 buf[SB_LABEL_SIZE + 1] = '\0'; 471 strcat(buf, "\n"); 472 return strlen(buf); 473 } 474 475 return 0; 476 } 477 478 STORE(__bch_flash_dev) 479 { 480 struct bcache_device *d = container_of(kobj, struct bcache_device, 481 kobj); 482 struct uuid_entry *u = &d->c->uuids[d->id]; 483 484 sysfs_strtoul(data_csum, d->data_csum); 485 486 if (attr == &sysfs_size) { 487 uint64_t v; 488 489 strtoi_h_or_return(buf, v); 490 491 u->sectors = v >> 9; 492 bch_uuid_write(d->c); 493 set_capacity(d->disk, u->sectors); 494 } 495 496 if (attr == &sysfs_label) { 497 memcpy(u->label, buf, SB_LABEL_SIZE); 498 bch_uuid_write(d->c); 499 } 500 501 if (attr == &sysfs_unregister) { 502 set_bit(BCACHE_DEV_DETACHING, &d->flags); 503 bcache_device_stop(d); 504 } 505 506 return size; 507 } 508 STORE_LOCKED(bch_flash_dev) 509 510 static struct attribute *bch_flash_dev_files[] = { 511 &sysfs_unregister, 512 #if 0 513 &sysfs_data_csum, 514 #endif 515 &sysfs_label, 516 &sysfs_size, 517 NULL 518 }; 519 KTYPE(bch_flash_dev); 520 521 struct bset_stats_op { 522 struct btree_op op; 523 size_t nodes; 524 struct bset_stats stats; 525 }; 526 527 static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b) 528 { 529 struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op); 530 531 op->nodes++; 532 bch_btree_keys_stats(&b->keys, &op->stats); 533 534 return MAP_CONTINUE; 535 } 536 537 static int bch_bset_print_stats(struct cache_set *c, char *buf) 538 { 539 struct bset_stats_op op; 540 int ret; 541 542 memset(&op, 0, sizeof(op)); 543 bch_btree_op_init(&op.op, -1); 544 545 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats); 546 if (ret < 0) 547 return ret; 548 549 return snprintf(buf, PAGE_SIZE, 550 "btree nodes: %zu\n" 551 "written sets: %zu\n" 552 "unwritten sets: %zu\n" 553 "written key bytes: %zu\n" 554 "unwritten key bytes: %zu\n" 555 "floats: %zu\n" 556 "failed: %zu\n", 557 op.nodes, 558 op.stats.sets_written, op.stats.sets_unwritten, 559 op.stats.bytes_written, op.stats.bytes_unwritten, 560 op.stats.floats, op.stats.failed); 561 } 562 563 static unsigned int bch_root_usage(struct cache_set *c) 564 { 565 unsigned int bytes = 0; 566 struct bkey *k; 567 struct btree *b; 568 struct btree_iter iter; 569 570 goto lock_root; 571 572 do { 573 rw_unlock(false, b); 574 lock_root: 575 b = c->root; 576 rw_lock(false, b, b->level); 577 } while (b != c->root); 578 579 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) 580 bytes += bkey_bytes(k); 581 582 rw_unlock(false, b); 583 584 return (bytes * 100) / btree_bytes(c); 585 } 586 587 static size_t bch_cache_size(struct cache_set *c) 588 { 589 size_t ret = 0; 590 struct btree *b; 591 592 mutex_lock(&c->bucket_lock); 593 list_for_each_entry(b, &c->btree_cache, list) 594 ret += 1 << (b->keys.page_order + PAGE_SHIFT); 595 596 mutex_unlock(&c->bucket_lock); 597 return ret; 598 } 599 600 static unsigned int bch_cache_max_chain(struct cache_set *c) 601 { 602 unsigned int ret = 0; 603 struct hlist_head *h; 604 605 mutex_lock(&c->bucket_lock); 606 607 for (h = c->bucket_hash; 608 h < c->bucket_hash + (1 << BUCKET_HASH_BITS); 609 h++) { 610 unsigned int i = 0; 611 struct hlist_node *p; 612 613 hlist_for_each(p, h) 614 i++; 615 616 ret = max(ret, i); 617 } 618 619 mutex_unlock(&c->bucket_lock); 620 return ret; 621 } 622 623 static unsigned int bch_btree_used(struct cache_set *c) 624 { 625 return div64_u64(c->gc_stats.key_bytes * 100, 626 (c->gc_stats.nodes ?: 1) * btree_bytes(c)); 627 } 628 629 static unsigned int bch_average_key_size(struct cache_set *c) 630 { 631 return c->gc_stats.nkeys 632 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) 633 : 0; 634 } 635 636 SHOW(__bch_cache_set) 637 { 638 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 639 640 sysfs_print(synchronous, CACHE_SYNC(&c->sb)); 641 sysfs_print(journal_delay_ms, c->journal_delay_ms); 642 sysfs_hprint(bucket_size, bucket_bytes(c)); 643 sysfs_hprint(block_size, block_bytes(c)); 644 sysfs_print(tree_depth, c->root->level); 645 sysfs_print(root_usage_percent, bch_root_usage(c)); 646 647 sysfs_hprint(btree_cache_size, bch_cache_size(c)); 648 sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c)); 649 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use); 650 651 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms); 652 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us); 653 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us); 654 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); 655 656 sysfs_print(btree_used_percent, bch_btree_used(c)); 657 sysfs_print(btree_nodes, c->gc_stats.nodes); 658 sysfs_hprint(average_key_size, bch_average_key_size(c)); 659 660 sysfs_print(cache_read_races, 661 atomic_long_read(&c->cache_read_races)); 662 663 sysfs_print(reclaim, 664 atomic_long_read(&c->reclaim)); 665 666 sysfs_print(flush_write, 667 atomic_long_read(&c->flush_write)); 668 669 sysfs_print(retry_flush_write, 670 atomic_long_read(&c->retry_flush_write)); 671 672 sysfs_print(writeback_keys_done, 673 atomic_long_read(&c->writeback_keys_done)); 674 sysfs_print(writeback_keys_failed, 675 atomic_long_read(&c->writeback_keys_failed)); 676 677 if (attr == &sysfs_errors) 678 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, 679 c->on_error); 680 681 /* See count_io_errors for why 88 */ 682 sysfs_print(io_error_halflife, c->error_decay * 88); 683 sysfs_print(io_error_limit, c->error_limit); 684 685 sysfs_hprint(congested, 686 ((uint64_t) bch_get_congested(c)) << 9); 687 sysfs_print(congested_read_threshold_us, 688 c->congested_read_threshold_us); 689 sysfs_print(congested_write_threshold_us, 690 c->congested_write_threshold_us); 691 692 sysfs_print(cutoff_writeback, bch_cutoff_writeback); 693 sysfs_print(cutoff_writeback_sync, bch_cutoff_writeback_sync); 694 695 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); 696 sysfs_printf(verify, "%i", c->verify); 697 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); 698 sysfs_printf(expensive_debug_checks, 699 "%i", c->expensive_debug_checks); 700 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); 701 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); 702 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); 703 sysfs_printf(gc_after_writeback, "%i", c->gc_after_writeback); 704 sysfs_printf(io_disable, "%i", 705 test_bit(CACHE_SET_IO_DISABLE, &c->flags)); 706 707 if (attr == &sysfs_bset_tree_stats) 708 return bch_bset_print_stats(c, buf); 709 710 return 0; 711 } 712 SHOW_LOCKED(bch_cache_set) 713 714 STORE(__bch_cache_set) 715 { 716 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 717 ssize_t v; 718 719 if (attr == &sysfs_unregister) 720 bch_cache_set_unregister(c); 721 722 if (attr == &sysfs_stop) 723 bch_cache_set_stop(c); 724 725 if (attr == &sysfs_synchronous) { 726 bool sync = strtoul_or_return(buf); 727 728 if (sync != CACHE_SYNC(&c->sb)) { 729 SET_CACHE_SYNC(&c->sb, sync); 730 bcache_write_super(c); 731 } 732 } 733 734 if (attr == &sysfs_flash_vol_create) { 735 int r; 736 uint64_t v; 737 738 strtoi_h_or_return(buf, v); 739 740 r = bch_flash_dev_create(c, v); 741 if (r) 742 return r; 743 } 744 745 if (attr == &sysfs_clear_stats) { 746 atomic_long_set(&c->writeback_keys_done, 0); 747 atomic_long_set(&c->writeback_keys_failed, 0); 748 749 memset(&c->gc_stats, 0, sizeof(struct gc_stat)); 750 bch_cache_accounting_clear(&c->accounting); 751 } 752 753 if (attr == &sysfs_trigger_gc) 754 force_wake_up_gc(c); 755 756 if (attr == &sysfs_prune_cache) { 757 struct shrink_control sc; 758 759 sc.gfp_mask = GFP_KERNEL; 760 sc.nr_to_scan = strtoul_or_return(buf); 761 c->shrink.scan_objects(&c->shrink, &sc); 762 } 763 764 sysfs_strtoul(congested_read_threshold_us, 765 c->congested_read_threshold_us); 766 sysfs_strtoul(congested_write_threshold_us, 767 c->congested_write_threshold_us); 768 769 if (attr == &sysfs_errors) { 770 v = __sysfs_match_string(error_actions, -1, buf); 771 if (v < 0) 772 return v; 773 774 c->on_error = v; 775 } 776 777 if (attr == &sysfs_io_error_limit) 778 c->error_limit = strtoul_or_return(buf); 779 780 /* See count_io_errors() for why 88 */ 781 if (attr == &sysfs_io_error_halflife) 782 c->error_decay = strtoul_or_return(buf) / 88; 783 784 if (attr == &sysfs_io_disable) { 785 v = strtoul_or_return(buf); 786 if (v) { 787 if (test_and_set_bit(CACHE_SET_IO_DISABLE, 788 &c->flags)) 789 pr_warn("CACHE_SET_IO_DISABLE already set"); 790 } else { 791 if (!test_and_clear_bit(CACHE_SET_IO_DISABLE, 792 &c->flags)) 793 pr_warn("CACHE_SET_IO_DISABLE already cleared"); 794 } 795 } 796 797 sysfs_strtoul(journal_delay_ms, c->journal_delay_ms); 798 sysfs_strtoul(verify, c->verify); 799 sysfs_strtoul(key_merging_disabled, c->key_merging_disabled); 800 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); 801 sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite); 802 sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled); 803 sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled); 804 /* 805 * write gc_after_writeback here may overwrite an already set 806 * BCH_DO_AUTO_GC, it doesn't matter because this flag will be 807 * set in next chance. 808 */ 809 sysfs_strtoul_clamp(gc_after_writeback, c->gc_after_writeback, 0, 1); 810 811 return size; 812 } 813 STORE_LOCKED(bch_cache_set) 814 815 SHOW(bch_cache_set_internal) 816 { 817 struct cache_set *c = container_of(kobj, struct cache_set, internal); 818 819 return bch_cache_set_show(&c->kobj, attr, buf); 820 } 821 822 STORE(bch_cache_set_internal) 823 { 824 struct cache_set *c = container_of(kobj, struct cache_set, internal); 825 826 return bch_cache_set_store(&c->kobj, attr, buf, size); 827 } 828 829 static void bch_cache_set_internal_release(struct kobject *k) 830 { 831 } 832 833 static struct attribute *bch_cache_set_files[] = { 834 &sysfs_unregister, 835 &sysfs_stop, 836 &sysfs_synchronous, 837 &sysfs_journal_delay_ms, 838 &sysfs_flash_vol_create, 839 840 &sysfs_bucket_size, 841 &sysfs_block_size, 842 &sysfs_tree_depth, 843 &sysfs_root_usage_percent, 844 &sysfs_btree_cache_size, 845 &sysfs_cache_available_percent, 846 847 &sysfs_average_key_size, 848 849 &sysfs_errors, 850 &sysfs_io_error_limit, 851 &sysfs_io_error_halflife, 852 &sysfs_congested, 853 &sysfs_congested_read_threshold_us, 854 &sysfs_congested_write_threshold_us, 855 &sysfs_clear_stats, 856 NULL 857 }; 858 KTYPE(bch_cache_set); 859 860 static struct attribute *bch_cache_set_internal_files[] = { 861 &sysfs_active_journal_entries, 862 863 sysfs_time_stats_attribute_list(btree_gc, sec, ms) 864 sysfs_time_stats_attribute_list(btree_split, sec, us) 865 sysfs_time_stats_attribute_list(btree_sort, ms, us) 866 sysfs_time_stats_attribute_list(btree_read, ms, us) 867 868 &sysfs_btree_nodes, 869 &sysfs_btree_used_percent, 870 &sysfs_btree_cache_max_chain, 871 872 &sysfs_bset_tree_stats, 873 &sysfs_cache_read_races, 874 &sysfs_reclaim, 875 &sysfs_flush_write, 876 &sysfs_retry_flush_write, 877 &sysfs_writeback_keys_done, 878 &sysfs_writeback_keys_failed, 879 880 &sysfs_trigger_gc, 881 &sysfs_prune_cache, 882 #ifdef CONFIG_BCACHE_DEBUG 883 &sysfs_verify, 884 &sysfs_key_merging_disabled, 885 &sysfs_expensive_debug_checks, 886 #endif 887 &sysfs_gc_always_rewrite, 888 &sysfs_btree_shrinker_disabled, 889 &sysfs_copy_gc_enabled, 890 &sysfs_gc_after_writeback, 891 &sysfs_io_disable, 892 &sysfs_cutoff_writeback, 893 &sysfs_cutoff_writeback_sync, 894 NULL 895 }; 896 KTYPE(bch_cache_set_internal); 897 898 static int __bch_cache_cmp(const void *l, const void *r) 899 { 900 return *((uint16_t *)r) - *((uint16_t *)l); 901 } 902 903 SHOW(__bch_cache) 904 { 905 struct cache *ca = container_of(kobj, struct cache, kobj); 906 907 sysfs_hprint(bucket_size, bucket_bytes(ca)); 908 sysfs_hprint(block_size, block_bytes(ca)); 909 sysfs_print(nbuckets, ca->sb.nbuckets); 910 sysfs_print(discard, ca->discard); 911 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); 912 sysfs_hprint(btree_written, 913 atomic_long_read(&ca->btree_sectors_written) << 9); 914 sysfs_hprint(metadata_written, 915 (atomic_long_read(&ca->meta_sectors_written) + 916 atomic_long_read(&ca->btree_sectors_written)) << 9); 917 918 sysfs_print(io_errors, 919 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); 920 921 if (attr == &sysfs_cache_replacement_policy) 922 return bch_snprint_string_list(buf, PAGE_SIZE, 923 cache_replacement_policies, 924 CACHE_REPLACEMENT(&ca->sb)); 925 926 if (attr == &sysfs_priority_stats) { 927 struct bucket *b; 928 size_t n = ca->sb.nbuckets, i; 929 size_t unused = 0, available = 0, dirty = 0, meta = 0; 930 uint64_t sum = 0; 931 /* Compute 31 quantiles */ 932 uint16_t q[31], *p, *cached; 933 ssize_t ret; 934 935 cached = p = vmalloc(array_size(sizeof(uint16_t), 936 ca->sb.nbuckets)); 937 if (!p) 938 return -ENOMEM; 939 940 mutex_lock(&ca->set->bucket_lock); 941 for_each_bucket(b, ca) { 942 if (!GC_SECTORS_USED(b)) 943 unused++; 944 if (GC_MARK(b) == GC_MARK_RECLAIMABLE) 945 available++; 946 if (GC_MARK(b) == GC_MARK_DIRTY) 947 dirty++; 948 if (GC_MARK(b) == GC_MARK_METADATA) 949 meta++; 950 } 951 952 for (i = ca->sb.first_bucket; i < n; i++) 953 p[i] = ca->buckets[i].prio; 954 mutex_unlock(&ca->set->bucket_lock); 955 956 sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL); 957 958 while (n && 959 !cached[n - 1]) 960 --n; 961 962 unused = ca->sb.nbuckets - n; 963 964 while (cached < p + n && 965 *cached == BTREE_PRIO) 966 cached++, n--; 967 968 for (i = 0; i < n; i++) 969 sum += INITIAL_PRIO - cached[i]; 970 971 if (n) 972 do_div(sum, n); 973 974 for (i = 0; i < ARRAY_SIZE(q); i++) 975 q[i] = INITIAL_PRIO - cached[n * (i + 1) / 976 (ARRAY_SIZE(q) + 1)]; 977 978 vfree(p); 979 980 ret = scnprintf(buf, PAGE_SIZE, 981 "Unused: %zu%%\n" 982 "Clean: %zu%%\n" 983 "Dirty: %zu%%\n" 984 "Metadata: %zu%%\n" 985 "Average: %llu\n" 986 "Sectors per Q: %zu\n" 987 "Quantiles: [", 988 unused * 100 / (size_t) ca->sb.nbuckets, 989 available * 100 / (size_t) ca->sb.nbuckets, 990 dirty * 100 / (size_t) ca->sb.nbuckets, 991 meta * 100 / (size_t) ca->sb.nbuckets, sum, 992 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1)); 993 994 for (i = 0; i < ARRAY_SIZE(q); i++) 995 ret += scnprintf(buf + ret, PAGE_SIZE - ret, 996 "%u ", q[i]); 997 ret--; 998 999 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); 1000 1001 return ret; 1002 } 1003 1004 return 0; 1005 } 1006 SHOW_LOCKED(bch_cache) 1007 1008 STORE(__bch_cache) 1009 { 1010 struct cache *ca = container_of(kobj, struct cache, kobj); 1011 ssize_t v; 1012 1013 if (attr == &sysfs_discard) { 1014 bool v = strtoul_or_return(buf); 1015 1016 if (blk_queue_discard(bdev_get_queue(ca->bdev))) 1017 ca->discard = v; 1018 1019 if (v != CACHE_DISCARD(&ca->sb)) { 1020 SET_CACHE_DISCARD(&ca->sb, v); 1021 bcache_write_super(ca->set); 1022 } 1023 } 1024 1025 if (attr == &sysfs_cache_replacement_policy) { 1026 v = __sysfs_match_string(cache_replacement_policies, -1, buf); 1027 if (v < 0) 1028 return v; 1029 1030 if ((unsigned int) v != CACHE_REPLACEMENT(&ca->sb)) { 1031 mutex_lock(&ca->set->bucket_lock); 1032 SET_CACHE_REPLACEMENT(&ca->sb, v); 1033 mutex_unlock(&ca->set->bucket_lock); 1034 1035 bcache_write_super(ca->set); 1036 } 1037 } 1038 1039 if (attr == &sysfs_clear_stats) { 1040 atomic_long_set(&ca->sectors_written, 0); 1041 atomic_long_set(&ca->btree_sectors_written, 0); 1042 atomic_long_set(&ca->meta_sectors_written, 0); 1043 atomic_set(&ca->io_count, 0); 1044 atomic_set(&ca->io_errors, 0); 1045 } 1046 1047 return size; 1048 } 1049 STORE_LOCKED(bch_cache) 1050 1051 static struct attribute *bch_cache_files[] = { 1052 &sysfs_bucket_size, 1053 &sysfs_block_size, 1054 &sysfs_nbuckets, 1055 &sysfs_priority_stats, 1056 &sysfs_discard, 1057 &sysfs_written, 1058 &sysfs_btree_written, 1059 &sysfs_metadata_written, 1060 &sysfs_io_errors, 1061 &sysfs_clear_stats, 1062 &sysfs_cache_replacement_policy, 1063 NULL 1064 }; 1065 KTYPE(bch_cache); 1066