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 strtoi_h_or_return(buf, v); 463 464 u->sectors = v >> 9; 465 bch_uuid_write(d->c); 466 set_capacity(d->disk, u->sectors); 467 } 468 469 if (attr == &sysfs_label) { 470 memcpy(u->label, buf, SB_LABEL_SIZE); 471 bch_uuid_write(d->c); 472 } 473 474 if (attr == &sysfs_unregister) { 475 set_bit(BCACHE_DEV_DETACHING, &d->flags); 476 bcache_device_stop(d); 477 } 478 479 return size; 480 } 481 STORE_LOCKED(bch_flash_dev) 482 483 static struct attribute *bch_flash_dev_files[] = { 484 &sysfs_unregister, 485 #if 0 486 &sysfs_data_csum, 487 #endif 488 &sysfs_label, 489 &sysfs_size, 490 NULL 491 }; 492 KTYPE(bch_flash_dev); 493 494 struct bset_stats_op { 495 struct btree_op op; 496 size_t nodes; 497 struct bset_stats stats; 498 }; 499 500 static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b) 501 { 502 struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op); 503 504 op->nodes++; 505 bch_btree_keys_stats(&b->keys, &op->stats); 506 507 return MAP_CONTINUE; 508 } 509 510 static int bch_bset_print_stats(struct cache_set *c, char *buf) 511 { 512 struct bset_stats_op op; 513 int ret; 514 515 memset(&op, 0, sizeof(op)); 516 bch_btree_op_init(&op.op, -1); 517 518 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats); 519 if (ret < 0) 520 return ret; 521 522 return snprintf(buf, PAGE_SIZE, 523 "btree nodes: %zu\n" 524 "written sets: %zu\n" 525 "unwritten sets: %zu\n" 526 "written key bytes: %zu\n" 527 "unwritten key bytes: %zu\n" 528 "floats: %zu\n" 529 "failed: %zu\n", 530 op.nodes, 531 op.stats.sets_written, op.stats.sets_unwritten, 532 op.stats.bytes_written, op.stats.bytes_unwritten, 533 op.stats.floats, op.stats.failed); 534 } 535 536 static unsigned int bch_root_usage(struct cache_set *c) 537 { 538 unsigned int bytes = 0; 539 struct bkey *k; 540 struct btree *b; 541 struct btree_iter iter; 542 543 goto lock_root; 544 545 do { 546 rw_unlock(false, b); 547 lock_root: 548 b = c->root; 549 rw_lock(false, b, b->level); 550 } while (b != c->root); 551 552 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) 553 bytes += bkey_bytes(k); 554 555 rw_unlock(false, b); 556 557 return (bytes * 100) / btree_bytes(c); 558 } 559 560 static size_t bch_cache_size(struct cache_set *c) 561 { 562 size_t ret = 0; 563 struct btree *b; 564 565 mutex_lock(&c->bucket_lock); 566 list_for_each_entry(b, &c->btree_cache, list) 567 ret += 1 << (b->keys.page_order + PAGE_SHIFT); 568 569 mutex_unlock(&c->bucket_lock); 570 return ret; 571 } 572 573 static unsigned int bch_cache_max_chain(struct cache_set *c) 574 { 575 unsigned int ret = 0; 576 struct hlist_head *h; 577 578 mutex_lock(&c->bucket_lock); 579 580 for (h = c->bucket_hash; 581 h < c->bucket_hash + (1 << BUCKET_HASH_BITS); 582 h++) { 583 unsigned int i = 0; 584 struct hlist_node *p; 585 586 hlist_for_each(p, h) 587 i++; 588 589 ret = max(ret, i); 590 } 591 592 mutex_unlock(&c->bucket_lock); 593 return ret; 594 } 595 596 static unsigned int bch_btree_used(struct cache_set *c) 597 { 598 return div64_u64(c->gc_stats.key_bytes * 100, 599 (c->gc_stats.nodes ?: 1) * btree_bytes(c)); 600 } 601 602 static unsigned int bch_average_key_size(struct cache_set *c) 603 { 604 return c->gc_stats.nkeys 605 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) 606 : 0; 607 } 608 609 SHOW(__bch_cache_set) 610 { 611 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 612 613 sysfs_print(synchronous, CACHE_SYNC(&c->sb)); 614 sysfs_print(journal_delay_ms, c->journal_delay_ms); 615 sysfs_hprint(bucket_size, bucket_bytes(c)); 616 sysfs_hprint(block_size, block_bytes(c)); 617 sysfs_print(tree_depth, c->root->level); 618 sysfs_print(root_usage_percent, bch_root_usage(c)); 619 620 sysfs_hprint(btree_cache_size, bch_cache_size(c)); 621 sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c)); 622 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use); 623 624 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms); 625 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us); 626 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us); 627 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); 628 629 sysfs_print(btree_used_percent, bch_btree_used(c)); 630 sysfs_print(btree_nodes, c->gc_stats.nodes); 631 sysfs_hprint(average_key_size, bch_average_key_size(c)); 632 633 sysfs_print(cache_read_races, 634 atomic_long_read(&c->cache_read_races)); 635 636 sysfs_print(reclaim, 637 atomic_long_read(&c->reclaim)); 638 639 sysfs_print(flush_write, 640 atomic_long_read(&c->flush_write)); 641 642 sysfs_print(retry_flush_write, 643 atomic_long_read(&c->retry_flush_write)); 644 645 sysfs_print(writeback_keys_done, 646 atomic_long_read(&c->writeback_keys_done)); 647 sysfs_print(writeback_keys_failed, 648 atomic_long_read(&c->writeback_keys_failed)); 649 650 if (attr == &sysfs_errors) 651 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, 652 c->on_error); 653 654 /* See count_io_errors for why 88 */ 655 sysfs_print(io_error_halflife, c->error_decay * 88); 656 sysfs_print(io_error_limit, c->error_limit); 657 658 sysfs_hprint(congested, 659 ((uint64_t) bch_get_congested(c)) << 9); 660 sysfs_print(congested_read_threshold_us, 661 c->congested_read_threshold_us); 662 sysfs_print(congested_write_threshold_us, 663 c->congested_write_threshold_us); 664 665 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); 666 sysfs_printf(verify, "%i", c->verify); 667 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); 668 sysfs_printf(expensive_debug_checks, 669 "%i", c->expensive_debug_checks); 670 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); 671 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); 672 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); 673 sysfs_printf(io_disable, "%i", 674 test_bit(CACHE_SET_IO_DISABLE, &c->flags)); 675 676 if (attr == &sysfs_bset_tree_stats) 677 return bch_bset_print_stats(c, buf); 678 679 return 0; 680 } 681 SHOW_LOCKED(bch_cache_set) 682 683 STORE(__bch_cache_set) 684 { 685 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 686 ssize_t v; 687 688 if (attr == &sysfs_unregister) 689 bch_cache_set_unregister(c); 690 691 if (attr == &sysfs_stop) 692 bch_cache_set_stop(c); 693 694 if (attr == &sysfs_synchronous) { 695 bool sync = strtoul_or_return(buf); 696 697 if (sync != CACHE_SYNC(&c->sb)) { 698 SET_CACHE_SYNC(&c->sb, sync); 699 bcache_write_super(c); 700 } 701 } 702 703 if (attr == &sysfs_flash_vol_create) { 704 int r; 705 uint64_t v; 706 strtoi_h_or_return(buf, v); 707 708 r = bch_flash_dev_create(c, v); 709 if (r) 710 return r; 711 } 712 713 if (attr == &sysfs_clear_stats) { 714 atomic_long_set(&c->writeback_keys_done, 0); 715 atomic_long_set(&c->writeback_keys_failed, 0); 716 717 memset(&c->gc_stats, 0, sizeof(struct gc_stat)); 718 bch_cache_accounting_clear(&c->accounting); 719 } 720 721 if (attr == &sysfs_trigger_gc) { 722 /* 723 * Garbage collection thread only works when sectors_to_gc < 0, 724 * when users write to sysfs entry trigger_gc, most of time 725 * they want to forcibly triger gargage collection. Here -1 is 726 * set to c->sectors_to_gc, to make gc_should_run() give a 727 * chance to permit gc thread to run. "give a chance" means 728 * before going into gc_should_run(), there is still chance 729 * that c->sectors_to_gc being set to other positive value. So 730 * writing sysfs entry trigger_gc won't always make sure gc 731 * thread takes effect. 732 */ 733 atomic_set(&c->sectors_to_gc, -1); 734 wake_up_gc(c); 735 } 736 737 if (attr == &sysfs_prune_cache) { 738 struct shrink_control sc; 739 sc.gfp_mask = GFP_KERNEL; 740 sc.nr_to_scan = strtoul_or_return(buf); 741 c->shrink.scan_objects(&c->shrink, &sc); 742 } 743 744 sysfs_strtoul(congested_read_threshold_us, 745 c->congested_read_threshold_us); 746 sysfs_strtoul(congested_write_threshold_us, 747 c->congested_write_threshold_us); 748 749 if (attr == &sysfs_errors) { 750 v = __sysfs_match_string(error_actions, -1, buf); 751 if (v < 0) 752 return v; 753 754 c->on_error = v; 755 } 756 757 if (attr == &sysfs_io_error_limit) 758 c->error_limit = strtoul_or_return(buf); 759 760 /* See count_io_errors() for why 88 */ 761 if (attr == &sysfs_io_error_halflife) 762 c->error_decay = strtoul_or_return(buf) / 88; 763 764 if (attr == &sysfs_io_disable) { 765 v = strtoul_or_return(buf); 766 if (v) { 767 if (test_and_set_bit(CACHE_SET_IO_DISABLE, 768 &c->flags)) 769 pr_warn("CACHE_SET_IO_DISABLE already set"); 770 } else { 771 if (!test_and_clear_bit(CACHE_SET_IO_DISABLE, 772 &c->flags)) 773 pr_warn("CACHE_SET_IO_DISABLE already cleared"); 774 } 775 } 776 777 sysfs_strtoul(journal_delay_ms, c->journal_delay_ms); 778 sysfs_strtoul(verify, c->verify); 779 sysfs_strtoul(key_merging_disabled, c->key_merging_disabled); 780 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); 781 sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite); 782 sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled); 783 sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled); 784 785 return size; 786 } 787 STORE_LOCKED(bch_cache_set) 788 789 SHOW(bch_cache_set_internal) 790 { 791 struct cache_set *c = container_of(kobj, struct cache_set, internal); 792 return bch_cache_set_show(&c->kobj, attr, buf); 793 } 794 795 STORE(bch_cache_set_internal) 796 { 797 struct cache_set *c = container_of(kobj, struct cache_set, internal); 798 return bch_cache_set_store(&c->kobj, attr, buf, size); 799 } 800 801 static void bch_cache_set_internal_release(struct kobject *k) 802 { 803 } 804 805 static struct attribute *bch_cache_set_files[] = { 806 &sysfs_unregister, 807 &sysfs_stop, 808 &sysfs_synchronous, 809 &sysfs_journal_delay_ms, 810 &sysfs_flash_vol_create, 811 812 &sysfs_bucket_size, 813 &sysfs_block_size, 814 &sysfs_tree_depth, 815 &sysfs_root_usage_percent, 816 &sysfs_btree_cache_size, 817 &sysfs_cache_available_percent, 818 819 &sysfs_average_key_size, 820 821 &sysfs_errors, 822 &sysfs_io_error_limit, 823 &sysfs_io_error_halflife, 824 &sysfs_congested, 825 &sysfs_congested_read_threshold_us, 826 &sysfs_congested_write_threshold_us, 827 &sysfs_clear_stats, 828 NULL 829 }; 830 KTYPE(bch_cache_set); 831 832 static struct attribute *bch_cache_set_internal_files[] = { 833 &sysfs_active_journal_entries, 834 835 sysfs_time_stats_attribute_list(btree_gc, sec, ms) 836 sysfs_time_stats_attribute_list(btree_split, sec, us) 837 sysfs_time_stats_attribute_list(btree_sort, ms, us) 838 sysfs_time_stats_attribute_list(btree_read, ms, us) 839 840 &sysfs_btree_nodes, 841 &sysfs_btree_used_percent, 842 &sysfs_btree_cache_max_chain, 843 844 &sysfs_bset_tree_stats, 845 &sysfs_cache_read_races, 846 &sysfs_reclaim, 847 &sysfs_flush_write, 848 &sysfs_retry_flush_write, 849 &sysfs_writeback_keys_done, 850 &sysfs_writeback_keys_failed, 851 852 &sysfs_trigger_gc, 853 &sysfs_prune_cache, 854 #ifdef CONFIG_BCACHE_DEBUG 855 &sysfs_verify, 856 &sysfs_key_merging_disabled, 857 &sysfs_expensive_debug_checks, 858 #endif 859 &sysfs_gc_always_rewrite, 860 &sysfs_btree_shrinker_disabled, 861 &sysfs_copy_gc_enabled, 862 &sysfs_io_disable, 863 NULL 864 }; 865 KTYPE(bch_cache_set_internal); 866 867 static int __bch_cache_cmp(const void *l, const void *r) 868 { 869 return *((uint16_t *)r) - *((uint16_t *)l); 870 } 871 872 SHOW(__bch_cache) 873 { 874 struct cache *ca = container_of(kobj, struct cache, kobj); 875 876 sysfs_hprint(bucket_size, bucket_bytes(ca)); 877 sysfs_hprint(block_size, block_bytes(ca)); 878 sysfs_print(nbuckets, ca->sb.nbuckets); 879 sysfs_print(discard, ca->discard); 880 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); 881 sysfs_hprint(btree_written, 882 atomic_long_read(&ca->btree_sectors_written) << 9); 883 sysfs_hprint(metadata_written, 884 (atomic_long_read(&ca->meta_sectors_written) + 885 atomic_long_read(&ca->btree_sectors_written)) << 9); 886 887 sysfs_print(io_errors, 888 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); 889 890 if (attr == &sysfs_cache_replacement_policy) 891 return bch_snprint_string_list(buf, PAGE_SIZE, 892 cache_replacement_policies, 893 CACHE_REPLACEMENT(&ca->sb)); 894 895 if (attr == &sysfs_priority_stats) { 896 struct bucket *b; 897 size_t n = ca->sb.nbuckets, i; 898 size_t unused = 0, available = 0, dirty = 0, meta = 0; 899 uint64_t sum = 0; 900 /* Compute 31 quantiles */ 901 uint16_t q[31], *p, *cached; 902 ssize_t ret; 903 904 cached = p = vmalloc(array_size(sizeof(uint16_t), 905 ca->sb.nbuckets)); 906 if (!p) 907 return -ENOMEM; 908 909 mutex_lock(&ca->set->bucket_lock); 910 for_each_bucket(b, ca) { 911 if (!GC_SECTORS_USED(b)) 912 unused++; 913 if (GC_MARK(b) == GC_MARK_RECLAIMABLE) 914 available++; 915 if (GC_MARK(b) == GC_MARK_DIRTY) 916 dirty++; 917 if (GC_MARK(b) == GC_MARK_METADATA) 918 meta++; 919 } 920 921 for (i = ca->sb.first_bucket; i < n; i++) 922 p[i] = ca->buckets[i].prio; 923 mutex_unlock(&ca->set->bucket_lock); 924 925 sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL); 926 927 while (n && 928 !cached[n - 1]) 929 --n; 930 931 unused = ca->sb.nbuckets - n; 932 933 while (cached < p + n && 934 *cached == BTREE_PRIO) 935 cached++, n--; 936 937 for (i = 0; i < n; i++) 938 sum += INITIAL_PRIO - cached[i]; 939 940 if (n) 941 do_div(sum, n); 942 943 for (i = 0; i < ARRAY_SIZE(q); i++) 944 q[i] = INITIAL_PRIO - cached[n * (i + 1) / 945 (ARRAY_SIZE(q) + 1)]; 946 947 vfree(p); 948 949 ret = scnprintf(buf, PAGE_SIZE, 950 "Unused: %zu%%\n" 951 "Clean: %zu%%\n" 952 "Dirty: %zu%%\n" 953 "Metadata: %zu%%\n" 954 "Average: %llu\n" 955 "Sectors per Q: %zu\n" 956 "Quantiles: [", 957 unused * 100 / (size_t) ca->sb.nbuckets, 958 available * 100 / (size_t) ca->sb.nbuckets, 959 dirty * 100 / (size_t) ca->sb.nbuckets, 960 meta * 100 / (size_t) ca->sb.nbuckets, sum, 961 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1)); 962 963 for (i = 0; i < ARRAY_SIZE(q); i++) 964 ret += scnprintf(buf + ret, PAGE_SIZE - ret, 965 "%u ", q[i]); 966 ret--; 967 968 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); 969 970 return ret; 971 } 972 973 return 0; 974 } 975 SHOW_LOCKED(bch_cache) 976 977 STORE(__bch_cache) 978 { 979 struct cache *ca = container_of(kobj, struct cache, kobj); 980 ssize_t v; 981 982 if (attr == &sysfs_discard) { 983 bool v = strtoul_or_return(buf); 984 985 if (blk_queue_discard(bdev_get_queue(ca->bdev))) 986 ca->discard = v; 987 988 if (v != CACHE_DISCARD(&ca->sb)) { 989 SET_CACHE_DISCARD(&ca->sb, v); 990 bcache_write_super(ca->set); 991 } 992 } 993 994 if (attr == &sysfs_cache_replacement_policy) { 995 v = __sysfs_match_string(cache_replacement_policies, -1, buf); 996 if (v < 0) 997 return v; 998 999 if ((unsigned int) v != CACHE_REPLACEMENT(&ca->sb)) { 1000 mutex_lock(&ca->set->bucket_lock); 1001 SET_CACHE_REPLACEMENT(&ca->sb, v); 1002 mutex_unlock(&ca->set->bucket_lock); 1003 1004 bcache_write_super(ca->set); 1005 } 1006 } 1007 1008 if (attr == &sysfs_clear_stats) { 1009 atomic_long_set(&ca->sectors_written, 0); 1010 atomic_long_set(&ca->btree_sectors_written, 0); 1011 atomic_long_set(&ca->meta_sectors_written, 0); 1012 atomic_set(&ca->io_count, 0); 1013 atomic_set(&ca->io_errors, 0); 1014 } 1015 1016 return size; 1017 } 1018 STORE_LOCKED(bch_cache) 1019 1020 static struct attribute *bch_cache_files[] = { 1021 &sysfs_bucket_size, 1022 &sysfs_block_size, 1023 &sysfs_nbuckets, 1024 &sysfs_priority_stats, 1025 &sysfs_discard, 1026 &sysfs_written, 1027 &sysfs_btree_written, 1028 &sysfs_metadata_written, 1029 &sysfs_io_errors, 1030 &sysfs_clear_stats, 1031 &sysfs_cache_replacement_policy, 1032 NULL 1033 }; 1034 KTYPE(bch_cache); 1035