1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * bcache sysfs interfaces 4 * 5 * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> 6 * Copyright 2012 Google, Inc. 7 */ 8 9 #include "bcache.h" 10 #include "sysfs.h" 11 #include "btree.h" 12 #include "request.h" 13 #include "writeback.h" 14 15 #include <linux/blkdev.h> 16 #include <linux/sort.h> 17 #include <linux/sched/clock.h> 18 19 static const char * const cache_replacement_policies[] = { 20 "lru", 21 "fifo", 22 "random", 23 NULL 24 }; 25 26 static const char * const error_actions[] = { 27 "unregister", 28 "panic", 29 NULL 30 }; 31 32 write_attribute(attach); 33 write_attribute(detach); 34 write_attribute(unregister); 35 write_attribute(stop); 36 write_attribute(clear_stats); 37 write_attribute(trigger_gc); 38 write_attribute(prune_cache); 39 write_attribute(flash_vol_create); 40 41 read_attribute(bucket_size); 42 read_attribute(block_size); 43 read_attribute(nbuckets); 44 read_attribute(tree_depth); 45 read_attribute(root_usage_percent); 46 read_attribute(priority_stats); 47 read_attribute(btree_cache_size); 48 read_attribute(btree_cache_max_chain); 49 read_attribute(cache_available_percent); 50 read_attribute(written); 51 read_attribute(btree_written); 52 read_attribute(metadata_written); 53 read_attribute(active_journal_entries); 54 55 sysfs_time_stats_attribute(btree_gc, sec, ms); 56 sysfs_time_stats_attribute(btree_split, sec, us); 57 sysfs_time_stats_attribute(btree_sort, ms, us); 58 sysfs_time_stats_attribute(btree_read, ms, us); 59 60 read_attribute(btree_nodes); 61 read_attribute(btree_used_percent); 62 read_attribute(average_key_size); 63 read_attribute(dirty_data); 64 read_attribute(bset_tree_stats); 65 66 read_attribute(state); 67 read_attribute(cache_read_races); 68 read_attribute(writeback_keys_done); 69 read_attribute(writeback_keys_failed); 70 read_attribute(io_errors); 71 read_attribute(congested); 72 rw_attribute(congested_read_threshold_us); 73 rw_attribute(congested_write_threshold_us); 74 75 rw_attribute(sequential_cutoff); 76 rw_attribute(data_csum); 77 rw_attribute(cache_mode); 78 rw_attribute(writeback_metadata); 79 rw_attribute(writeback_running); 80 rw_attribute(writeback_percent); 81 rw_attribute(writeback_delay); 82 rw_attribute(writeback_rate); 83 84 rw_attribute(writeback_rate_update_seconds); 85 rw_attribute(writeback_rate_i_term_inverse); 86 rw_attribute(writeback_rate_p_term_inverse); 87 rw_attribute(writeback_rate_minimum); 88 read_attribute(writeback_rate_debug); 89 90 read_attribute(stripe_size); 91 read_attribute(partial_stripes_expensive); 92 93 rw_attribute(synchronous); 94 rw_attribute(journal_delay_ms); 95 rw_attribute(discard); 96 rw_attribute(running); 97 rw_attribute(label); 98 rw_attribute(readahead); 99 rw_attribute(errors); 100 rw_attribute(io_error_limit); 101 rw_attribute(io_error_halflife); 102 rw_attribute(verify); 103 rw_attribute(bypass_torture_test); 104 rw_attribute(key_merging_disabled); 105 rw_attribute(gc_always_rewrite); 106 rw_attribute(expensive_debug_checks); 107 rw_attribute(cache_replacement_policy); 108 rw_attribute(btree_shrinker_disabled); 109 rw_attribute(copy_gc_enabled); 110 rw_attribute(size); 111 112 SHOW(__bch_cached_dev) 113 { 114 struct cached_dev *dc = container_of(kobj, struct cached_dev, 115 disk.kobj); 116 const char *states[] = { "no cache", "clean", "dirty", "inconsistent" }; 117 118 #define var(stat) (dc->stat) 119 120 if (attr == &sysfs_cache_mode) 121 return bch_snprint_string_list(buf, PAGE_SIZE, 122 bch_cache_modes + 1, 123 BDEV_CACHE_MODE(&dc->sb)); 124 125 sysfs_printf(data_csum, "%i", dc->disk.data_csum); 126 var_printf(verify, "%i"); 127 var_printf(bypass_torture_test, "%i"); 128 var_printf(writeback_metadata, "%i"); 129 var_printf(writeback_running, "%i"); 130 var_print(writeback_delay); 131 var_print(writeback_percent); 132 sysfs_hprint(writeback_rate, dc->writeback_rate.rate << 9); 133 134 var_print(writeback_rate_update_seconds); 135 var_print(writeback_rate_i_term_inverse); 136 var_print(writeback_rate_p_term_inverse); 137 var_print(writeback_rate_minimum); 138 139 if (attr == &sysfs_writeback_rate_debug) { 140 char rate[20]; 141 char dirty[20]; 142 char target[20]; 143 char proportional[20]; 144 char integral[20]; 145 char change[20]; 146 s64 next_io; 147 148 bch_hprint(rate, dc->writeback_rate.rate << 9); 149 bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9); 150 bch_hprint(target, dc->writeback_rate_target << 9); 151 bch_hprint(proportional,dc->writeback_rate_proportional << 9); 152 bch_hprint(integral, dc->writeback_rate_integral_scaled << 9); 153 bch_hprint(change, dc->writeback_rate_change << 9); 154 155 next_io = div64_s64(dc->writeback_rate.next - local_clock(), 156 NSEC_PER_MSEC); 157 158 return sprintf(buf, 159 "rate:\t\t%s/sec\n" 160 "dirty:\t\t%s\n" 161 "target:\t\t%s\n" 162 "proportional:\t%s\n" 163 "integral:\t%s\n" 164 "change:\t\t%s/sec\n" 165 "next io:\t%llims\n", 166 rate, dirty, target, proportional, 167 integral, change, next_io); 168 } 169 170 sysfs_hprint(dirty_data, 171 bcache_dev_sectors_dirty(&dc->disk) << 9); 172 173 sysfs_hprint(stripe_size, dc->disk.stripe_size << 9); 174 var_printf(partial_stripes_expensive, "%u"); 175 176 var_hprint(sequential_cutoff); 177 var_hprint(readahead); 178 179 sysfs_print(running, atomic_read(&dc->running)); 180 sysfs_print(state, states[BDEV_STATE(&dc->sb)]); 181 182 if (attr == &sysfs_label) { 183 memcpy(buf, dc->sb.label, SB_LABEL_SIZE); 184 buf[SB_LABEL_SIZE + 1] = '\0'; 185 strcat(buf, "\n"); 186 return strlen(buf); 187 } 188 189 #undef var 190 return 0; 191 } 192 SHOW_LOCKED(bch_cached_dev) 193 194 STORE(__cached_dev) 195 { 196 struct cached_dev *dc = container_of(kobj, struct cached_dev, 197 disk.kobj); 198 ssize_t v = size; 199 struct cache_set *c; 200 struct kobj_uevent_env *env; 201 202 #define d_strtoul(var) sysfs_strtoul(var, dc->var) 203 #define d_strtoul_nonzero(var) sysfs_strtoul_clamp(var, dc->var, 1, INT_MAX) 204 #define d_strtoi_h(var) sysfs_hatoi(var, dc->var) 205 206 sysfs_strtoul(data_csum, dc->disk.data_csum); 207 d_strtoul(verify); 208 d_strtoul(bypass_torture_test); 209 d_strtoul(writeback_metadata); 210 d_strtoul(writeback_running); 211 d_strtoul(writeback_delay); 212 213 sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40); 214 215 sysfs_strtoul_clamp(writeback_rate, 216 dc->writeback_rate.rate, 1, INT_MAX); 217 218 d_strtoul_nonzero(writeback_rate_update_seconds); 219 d_strtoul(writeback_rate_i_term_inverse); 220 d_strtoul_nonzero(writeback_rate_p_term_inverse); 221 222 d_strtoi_h(sequential_cutoff); 223 d_strtoi_h(readahead); 224 225 if (attr == &sysfs_clear_stats) 226 bch_cache_accounting_clear(&dc->accounting); 227 228 if (attr == &sysfs_running && 229 strtoul_or_return(buf)) 230 bch_cached_dev_run(dc); 231 232 if (attr == &sysfs_cache_mode) { 233 v = bch_read_string_list(buf, bch_cache_modes + 1); 234 235 if (v < 0) 236 return v; 237 238 if ((unsigned) v != BDEV_CACHE_MODE(&dc->sb)) { 239 SET_BDEV_CACHE_MODE(&dc->sb, v); 240 bch_write_bdev_super(dc, NULL); 241 } 242 } 243 244 if (attr == &sysfs_label) { 245 if (size > SB_LABEL_SIZE) 246 return -EINVAL; 247 memcpy(dc->sb.label, buf, size); 248 if (size < SB_LABEL_SIZE) 249 dc->sb.label[size] = '\0'; 250 if (size && dc->sb.label[size - 1] == '\n') 251 dc->sb.label[size - 1] = '\0'; 252 bch_write_bdev_super(dc, NULL); 253 if (dc->disk.c) { 254 memcpy(dc->disk.c->uuids[dc->disk.id].label, 255 buf, SB_LABEL_SIZE); 256 bch_uuid_write(dc->disk.c); 257 } 258 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); 259 if (!env) 260 return -ENOMEM; 261 add_uevent_var(env, "DRIVER=bcache"); 262 add_uevent_var(env, "CACHED_UUID=%pU", dc->sb.uuid), 263 add_uevent_var(env, "CACHED_LABEL=%s", buf); 264 kobject_uevent_env( 265 &disk_to_dev(dc->disk.disk)->kobj, KOBJ_CHANGE, env->envp); 266 kfree(env); 267 } 268 269 if (attr == &sysfs_attach) { 270 if (bch_parse_uuid(buf, dc->sb.set_uuid) < 16) 271 return -EINVAL; 272 273 list_for_each_entry(c, &bch_cache_sets, list) { 274 v = bch_cached_dev_attach(dc, c); 275 if (!v) 276 return size; 277 } 278 279 pr_err("Can't attach %s: cache set not found", buf); 280 size = v; 281 } 282 283 if (attr == &sysfs_detach && dc->disk.c) 284 bch_cached_dev_detach(dc); 285 286 if (attr == &sysfs_stop) 287 bcache_device_stop(&dc->disk); 288 289 return size; 290 } 291 292 STORE(bch_cached_dev) 293 { 294 struct cached_dev *dc = container_of(kobj, struct cached_dev, 295 disk.kobj); 296 297 mutex_lock(&bch_register_lock); 298 size = __cached_dev_store(kobj, attr, buf, size); 299 300 if (attr == &sysfs_writeback_running) 301 bch_writeback_queue(dc); 302 303 if (attr == &sysfs_writeback_percent) 304 schedule_delayed_work(&dc->writeback_rate_update, 305 dc->writeback_rate_update_seconds * HZ); 306 307 mutex_unlock(&bch_register_lock); 308 return size; 309 } 310 311 static struct attribute *bch_cached_dev_files[] = { 312 &sysfs_attach, 313 &sysfs_detach, 314 &sysfs_stop, 315 #if 0 316 &sysfs_data_csum, 317 #endif 318 &sysfs_cache_mode, 319 &sysfs_writeback_metadata, 320 &sysfs_writeback_running, 321 &sysfs_writeback_delay, 322 &sysfs_writeback_percent, 323 &sysfs_writeback_rate, 324 &sysfs_writeback_rate_update_seconds, 325 &sysfs_writeback_rate_i_term_inverse, 326 &sysfs_writeback_rate_p_term_inverse, 327 &sysfs_writeback_rate_debug, 328 &sysfs_dirty_data, 329 &sysfs_stripe_size, 330 &sysfs_partial_stripes_expensive, 331 &sysfs_sequential_cutoff, 332 &sysfs_clear_stats, 333 &sysfs_running, 334 &sysfs_state, 335 &sysfs_label, 336 &sysfs_readahead, 337 #ifdef CONFIG_BCACHE_DEBUG 338 &sysfs_verify, 339 &sysfs_bypass_torture_test, 340 #endif 341 NULL 342 }; 343 KTYPE(bch_cached_dev); 344 345 SHOW(bch_flash_dev) 346 { 347 struct bcache_device *d = container_of(kobj, struct bcache_device, 348 kobj); 349 struct uuid_entry *u = &d->c->uuids[d->id]; 350 351 sysfs_printf(data_csum, "%i", d->data_csum); 352 sysfs_hprint(size, u->sectors << 9); 353 354 if (attr == &sysfs_label) { 355 memcpy(buf, u->label, SB_LABEL_SIZE); 356 buf[SB_LABEL_SIZE + 1] = '\0'; 357 strcat(buf, "\n"); 358 return strlen(buf); 359 } 360 361 return 0; 362 } 363 364 STORE(__bch_flash_dev) 365 { 366 struct bcache_device *d = container_of(kobj, struct bcache_device, 367 kobj); 368 struct uuid_entry *u = &d->c->uuids[d->id]; 369 370 sysfs_strtoul(data_csum, d->data_csum); 371 372 if (attr == &sysfs_size) { 373 uint64_t v; 374 strtoi_h_or_return(buf, v); 375 376 u->sectors = v >> 9; 377 bch_uuid_write(d->c); 378 set_capacity(d->disk, u->sectors); 379 } 380 381 if (attr == &sysfs_label) { 382 memcpy(u->label, buf, SB_LABEL_SIZE); 383 bch_uuid_write(d->c); 384 } 385 386 if (attr == &sysfs_unregister) { 387 set_bit(BCACHE_DEV_DETACHING, &d->flags); 388 bcache_device_stop(d); 389 } 390 391 return size; 392 } 393 STORE_LOCKED(bch_flash_dev) 394 395 static struct attribute *bch_flash_dev_files[] = { 396 &sysfs_unregister, 397 #if 0 398 &sysfs_data_csum, 399 #endif 400 &sysfs_label, 401 &sysfs_size, 402 NULL 403 }; 404 KTYPE(bch_flash_dev); 405 406 struct bset_stats_op { 407 struct btree_op op; 408 size_t nodes; 409 struct bset_stats stats; 410 }; 411 412 static int bch_btree_bset_stats(struct btree_op *b_op, struct btree *b) 413 { 414 struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op); 415 416 op->nodes++; 417 bch_btree_keys_stats(&b->keys, &op->stats); 418 419 return MAP_CONTINUE; 420 } 421 422 static int bch_bset_print_stats(struct cache_set *c, char *buf) 423 { 424 struct bset_stats_op op; 425 int ret; 426 427 memset(&op, 0, sizeof(op)); 428 bch_btree_op_init(&op.op, -1); 429 430 ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, bch_btree_bset_stats); 431 if (ret < 0) 432 return ret; 433 434 return snprintf(buf, PAGE_SIZE, 435 "btree nodes: %zu\n" 436 "written sets: %zu\n" 437 "unwritten sets: %zu\n" 438 "written key bytes: %zu\n" 439 "unwritten key bytes: %zu\n" 440 "floats: %zu\n" 441 "failed: %zu\n", 442 op.nodes, 443 op.stats.sets_written, op.stats.sets_unwritten, 444 op.stats.bytes_written, op.stats.bytes_unwritten, 445 op.stats.floats, op.stats.failed); 446 } 447 448 static unsigned bch_root_usage(struct cache_set *c) 449 { 450 unsigned bytes = 0; 451 struct bkey *k; 452 struct btree *b; 453 struct btree_iter iter; 454 455 goto lock_root; 456 457 do { 458 rw_unlock(false, b); 459 lock_root: 460 b = c->root; 461 rw_lock(false, b, b->level); 462 } while (b != c->root); 463 464 for_each_key_filter(&b->keys, k, &iter, bch_ptr_bad) 465 bytes += bkey_bytes(k); 466 467 rw_unlock(false, b); 468 469 return (bytes * 100) / btree_bytes(c); 470 } 471 472 static size_t bch_cache_size(struct cache_set *c) 473 { 474 size_t ret = 0; 475 struct btree *b; 476 477 mutex_lock(&c->bucket_lock); 478 list_for_each_entry(b, &c->btree_cache, list) 479 ret += 1 << (b->keys.page_order + PAGE_SHIFT); 480 481 mutex_unlock(&c->bucket_lock); 482 return ret; 483 } 484 485 static unsigned bch_cache_max_chain(struct cache_set *c) 486 { 487 unsigned ret = 0; 488 struct hlist_head *h; 489 490 mutex_lock(&c->bucket_lock); 491 492 for (h = c->bucket_hash; 493 h < c->bucket_hash + (1 << BUCKET_HASH_BITS); 494 h++) { 495 unsigned i = 0; 496 struct hlist_node *p; 497 498 hlist_for_each(p, h) 499 i++; 500 501 ret = max(ret, i); 502 } 503 504 mutex_unlock(&c->bucket_lock); 505 return ret; 506 } 507 508 static unsigned bch_btree_used(struct cache_set *c) 509 { 510 return div64_u64(c->gc_stats.key_bytes * 100, 511 (c->gc_stats.nodes ?: 1) * btree_bytes(c)); 512 } 513 514 static unsigned bch_average_key_size(struct cache_set *c) 515 { 516 return c->gc_stats.nkeys 517 ? div64_u64(c->gc_stats.data, c->gc_stats.nkeys) 518 : 0; 519 } 520 521 SHOW(__bch_cache_set) 522 { 523 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 524 525 sysfs_print(synchronous, CACHE_SYNC(&c->sb)); 526 sysfs_print(journal_delay_ms, c->journal_delay_ms); 527 sysfs_hprint(bucket_size, bucket_bytes(c)); 528 sysfs_hprint(block_size, block_bytes(c)); 529 sysfs_print(tree_depth, c->root->level); 530 sysfs_print(root_usage_percent, bch_root_usage(c)); 531 532 sysfs_hprint(btree_cache_size, bch_cache_size(c)); 533 sysfs_print(btree_cache_max_chain, bch_cache_max_chain(c)); 534 sysfs_print(cache_available_percent, 100 - c->gc_stats.in_use); 535 536 sysfs_print_time_stats(&c->btree_gc_time, btree_gc, sec, ms); 537 sysfs_print_time_stats(&c->btree_split_time, btree_split, sec, us); 538 sysfs_print_time_stats(&c->sort.time, btree_sort, ms, us); 539 sysfs_print_time_stats(&c->btree_read_time, btree_read, ms, us); 540 541 sysfs_print(btree_used_percent, bch_btree_used(c)); 542 sysfs_print(btree_nodes, c->gc_stats.nodes); 543 sysfs_hprint(average_key_size, bch_average_key_size(c)); 544 545 sysfs_print(cache_read_races, 546 atomic_long_read(&c->cache_read_races)); 547 548 sysfs_print(writeback_keys_done, 549 atomic_long_read(&c->writeback_keys_done)); 550 sysfs_print(writeback_keys_failed, 551 atomic_long_read(&c->writeback_keys_failed)); 552 553 if (attr == &sysfs_errors) 554 return bch_snprint_string_list(buf, PAGE_SIZE, error_actions, 555 c->on_error); 556 557 /* See count_io_errors for why 88 */ 558 sysfs_print(io_error_halflife, c->error_decay * 88); 559 sysfs_print(io_error_limit, c->error_limit >> IO_ERROR_SHIFT); 560 561 sysfs_hprint(congested, 562 ((uint64_t) bch_get_congested(c)) << 9); 563 sysfs_print(congested_read_threshold_us, 564 c->congested_read_threshold_us); 565 sysfs_print(congested_write_threshold_us, 566 c->congested_write_threshold_us); 567 568 sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); 569 sysfs_printf(verify, "%i", c->verify); 570 sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); 571 sysfs_printf(expensive_debug_checks, 572 "%i", c->expensive_debug_checks); 573 sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite); 574 sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled); 575 sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled); 576 577 if (attr == &sysfs_bset_tree_stats) 578 return bch_bset_print_stats(c, buf); 579 580 return 0; 581 } 582 SHOW_LOCKED(bch_cache_set) 583 584 STORE(__bch_cache_set) 585 { 586 struct cache_set *c = container_of(kobj, struct cache_set, kobj); 587 588 if (attr == &sysfs_unregister) 589 bch_cache_set_unregister(c); 590 591 if (attr == &sysfs_stop) 592 bch_cache_set_stop(c); 593 594 if (attr == &sysfs_synchronous) { 595 bool sync = strtoul_or_return(buf); 596 597 if (sync != CACHE_SYNC(&c->sb)) { 598 SET_CACHE_SYNC(&c->sb, sync); 599 bcache_write_super(c); 600 } 601 } 602 603 if (attr == &sysfs_flash_vol_create) { 604 int r; 605 uint64_t v; 606 strtoi_h_or_return(buf, v); 607 608 r = bch_flash_dev_create(c, v); 609 if (r) 610 return r; 611 } 612 613 if (attr == &sysfs_clear_stats) { 614 atomic_long_set(&c->writeback_keys_done, 0); 615 atomic_long_set(&c->writeback_keys_failed, 0); 616 617 memset(&c->gc_stats, 0, sizeof(struct gc_stat)); 618 bch_cache_accounting_clear(&c->accounting); 619 } 620 621 if (attr == &sysfs_trigger_gc) { 622 /* 623 * Garbage collection thread only works when sectors_to_gc < 0, 624 * when users write to sysfs entry trigger_gc, most of time 625 * they want to forcibly triger gargage collection. Here -1 is 626 * set to c->sectors_to_gc, to make gc_should_run() give a 627 * chance to permit gc thread to run. "give a chance" means 628 * before going into gc_should_run(), there is still chance 629 * that c->sectors_to_gc being set to other positive value. So 630 * writing sysfs entry trigger_gc won't always make sure gc 631 * thread takes effect. 632 */ 633 atomic_set(&c->sectors_to_gc, -1); 634 wake_up_gc(c); 635 } 636 637 if (attr == &sysfs_prune_cache) { 638 struct shrink_control sc; 639 sc.gfp_mask = GFP_KERNEL; 640 sc.nr_to_scan = strtoul_or_return(buf); 641 c->shrink.scan_objects(&c->shrink, &sc); 642 } 643 644 sysfs_strtoul(congested_read_threshold_us, 645 c->congested_read_threshold_us); 646 sysfs_strtoul(congested_write_threshold_us, 647 c->congested_write_threshold_us); 648 649 if (attr == &sysfs_errors) { 650 ssize_t v = bch_read_string_list(buf, error_actions); 651 652 if (v < 0) 653 return v; 654 655 c->on_error = v; 656 } 657 658 if (attr == &sysfs_io_error_limit) 659 c->error_limit = strtoul_or_return(buf) << IO_ERROR_SHIFT; 660 661 /* See count_io_errors() for why 88 */ 662 if (attr == &sysfs_io_error_halflife) 663 c->error_decay = strtoul_or_return(buf) / 88; 664 665 sysfs_strtoul(journal_delay_ms, c->journal_delay_ms); 666 sysfs_strtoul(verify, c->verify); 667 sysfs_strtoul(key_merging_disabled, c->key_merging_disabled); 668 sysfs_strtoul(expensive_debug_checks, c->expensive_debug_checks); 669 sysfs_strtoul(gc_always_rewrite, c->gc_always_rewrite); 670 sysfs_strtoul(btree_shrinker_disabled, c->shrinker_disabled); 671 sysfs_strtoul(copy_gc_enabled, c->copy_gc_enabled); 672 673 return size; 674 } 675 STORE_LOCKED(bch_cache_set) 676 677 SHOW(bch_cache_set_internal) 678 { 679 struct cache_set *c = container_of(kobj, struct cache_set, internal); 680 return bch_cache_set_show(&c->kobj, attr, buf); 681 } 682 683 STORE(bch_cache_set_internal) 684 { 685 struct cache_set *c = container_of(kobj, struct cache_set, internal); 686 return bch_cache_set_store(&c->kobj, attr, buf, size); 687 } 688 689 static void bch_cache_set_internal_release(struct kobject *k) 690 { 691 } 692 693 static struct attribute *bch_cache_set_files[] = { 694 &sysfs_unregister, 695 &sysfs_stop, 696 &sysfs_synchronous, 697 &sysfs_journal_delay_ms, 698 &sysfs_flash_vol_create, 699 700 &sysfs_bucket_size, 701 &sysfs_block_size, 702 &sysfs_tree_depth, 703 &sysfs_root_usage_percent, 704 &sysfs_btree_cache_size, 705 &sysfs_cache_available_percent, 706 707 &sysfs_average_key_size, 708 709 &sysfs_errors, 710 &sysfs_io_error_limit, 711 &sysfs_io_error_halflife, 712 &sysfs_congested, 713 &sysfs_congested_read_threshold_us, 714 &sysfs_congested_write_threshold_us, 715 &sysfs_clear_stats, 716 NULL 717 }; 718 KTYPE(bch_cache_set); 719 720 static struct attribute *bch_cache_set_internal_files[] = { 721 &sysfs_active_journal_entries, 722 723 sysfs_time_stats_attribute_list(btree_gc, sec, ms) 724 sysfs_time_stats_attribute_list(btree_split, sec, us) 725 sysfs_time_stats_attribute_list(btree_sort, ms, us) 726 sysfs_time_stats_attribute_list(btree_read, ms, us) 727 728 &sysfs_btree_nodes, 729 &sysfs_btree_used_percent, 730 &sysfs_btree_cache_max_chain, 731 732 &sysfs_bset_tree_stats, 733 &sysfs_cache_read_races, 734 &sysfs_writeback_keys_done, 735 &sysfs_writeback_keys_failed, 736 737 &sysfs_trigger_gc, 738 &sysfs_prune_cache, 739 #ifdef CONFIG_BCACHE_DEBUG 740 &sysfs_verify, 741 &sysfs_key_merging_disabled, 742 &sysfs_expensive_debug_checks, 743 #endif 744 &sysfs_gc_always_rewrite, 745 &sysfs_btree_shrinker_disabled, 746 &sysfs_copy_gc_enabled, 747 NULL 748 }; 749 KTYPE(bch_cache_set_internal); 750 751 static int __bch_cache_cmp(const void *l, const void *r) 752 { 753 return *((uint16_t *)r) - *((uint16_t *)l); 754 } 755 756 SHOW(__bch_cache) 757 { 758 struct cache *ca = container_of(kobj, struct cache, kobj); 759 760 sysfs_hprint(bucket_size, bucket_bytes(ca)); 761 sysfs_hprint(block_size, block_bytes(ca)); 762 sysfs_print(nbuckets, ca->sb.nbuckets); 763 sysfs_print(discard, ca->discard); 764 sysfs_hprint(written, atomic_long_read(&ca->sectors_written) << 9); 765 sysfs_hprint(btree_written, 766 atomic_long_read(&ca->btree_sectors_written) << 9); 767 sysfs_hprint(metadata_written, 768 (atomic_long_read(&ca->meta_sectors_written) + 769 atomic_long_read(&ca->btree_sectors_written)) << 9); 770 771 sysfs_print(io_errors, 772 atomic_read(&ca->io_errors) >> IO_ERROR_SHIFT); 773 774 if (attr == &sysfs_cache_replacement_policy) 775 return bch_snprint_string_list(buf, PAGE_SIZE, 776 cache_replacement_policies, 777 CACHE_REPLACEMENT(&ca->sb)); 778 779 if (attr == &sysfs_priority_stats) { 780 struct bucket *b; 781 size_t n = ca->sb.nbuckets, i; 782 size_t unused = 0, available = 0, dirty = 0, meta = 0; 783 uint64_t sum = 0; 784 /* Compute 31 quantiles */ 785 uint16_t q[31], *p, *cached; 786 ssize_t ret; 787 788 cached = p = vmalloc(ca->sb.nbuckets * sizeof(uint16_t)); 789 if (!p) 790 return -ENOMEM; 791 792 mutex_lock(&ca->set->bucket_lock); 793 for_each_bucket(b, ca) { 794 if (!GC_SECTORS_USED(b)) 795 unused++; 796 if (GC_MARK(b) == GC_MARK_RECLAIMABLE) 797 available++; 798 if (GC_MARK(b) == GC_MARK_DIRTY) 799 dirty++; 800 if (GC_MARK(b) == GC_MARK_METADATA) 801 meta++; 802 } 803 804 for (i = ca->sb.first_bucket; i < n; i++) 805 p[i] = ca->buckets[i].prio; 806 mutex_unlock(&ca->set->bucket_lock); 807 808 sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL); 809 810 while (n && 811 !cached[n - 1]) 812 --n; 813 814 unused = ca->sb.nbuckets - n; 815 816 while (cached < p + n && 817 *cached == BTREE_PRIO) 818 cached++, n--; 819 820 for (i = 0; i < n; i++) 821 sum += INITIAL_PRIO - cached[i]; 822 823 if (n) 824 do_div(sum, n); 825 826 for (i = 0; i < ARRAY_SIZE(q); i++) 827 q[i] = INITIAL_PRIO - cached[n * (i + 1) / 828 (ARRAY_SIZE(q) + 1)]; 829 830 vfree(p); 831 832 ret = scnprintf(buf, PAGE_SIZE, 833 "Unused: %zu%%\n" 834 "Clean: %zu%%\n" 835 "Dirty: %zu%%\n" 836 "Metadata: %zu%%\n" 837 "Average: %llu\n" 838 "Sectors per Q: %zu\n" 839 "Quantiles: [", 840 unused * 100 / (size_t) ca->sb.nbuckets, 841 available * 100 / (size_t) ca->sb.nbuckets, 842 dirty * 100 / (size_t) ca->sb.nbuckets, 843 meta * 100 / (size_t) ca->sb.nbuckets, sum, 844 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1)); 845 846 for (i = 0; i < ARRAY_SIZE(q); i++) 847 ret += scnprintf(buf + ret, PAGE_SIZE - ret, 848 "%u ", q[i]); 849 ret--; 850 851 ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n"); 852 853 return ret; 854 } 855 856 return 0; 857 } 858 SHOW_LOCKED(bch_cache) 859 860 STORE(__bch_cache) 861 { 862 struct cache *ca = container_of(kobj, struct cache, kobj); 863 864 if (attr == &sysfs_discard) { 865 bool v = strtoul_or_return(buf); 866 867 if (blk_queue_discard(bdev_get_queue(ca->bdev))) 868 ca->discard = v; 869 870 if (v != CACHE_DISCARD(&ca->sb)) { 871 SET_CACHE_DISCARD(&ca->sb, v); 872 bcache_write_super(ca->set); 873 } 874 } 875 876 if (attr == &sysfs_cache_replacement_policy) { 877 ssize_t v = bch_read_string_list(buf, cache_replacement_policies); 878 879 if (v < 0) 880 return v; 881 882 if ((unsigned) v != CACHE_REPLACEMENT(&ca->sb)) { 883 mutex_lock(&ca->set->bucket_lock); 884 SET_CACHE_REPLACEMENT(&ca->sb, v); 885 mutex_unlock(&ca->set->bucket_lock); 886 887 bcache_write_super(ca->set); 888 } 889 } 890 891 if (attr == &sysfs_clear_stats) { 892 atomic_long_set(&ca->sectors_written, 0); 893 atomic_long_set(&ca->btree_sectors_written, 0); 894 atomic_long_set(&ca->meta_sectors_written, 0); 895 atomic_set(&ca->io_count, 0); 896 atomic_set(&ca->io_errors, 0); 897 } 898 899 return size; 900 } 901 STORE_LOCKED(bch_cache) 902 903 static struct attribute *bch_cache_files[] = { 904 &sysfs_bucket_size, 905 &sysfs_block_size, 906 &sysfs_nbuckets, 907 &sysfs_priority_stats, 908 &sysfs_discard, 909 &sysfs_written, 910 &sysfs_btree_written, 911 &sysfs_metadata_written, 912 &sysfs_io_errors, 913 &sysfs_clear_stats, 914 &sysfs_cache_replacement_policy, 915 NULL 916 }; 917 KTYPE(bch_cache); 918